From cbcfb07c9fae9643f44ed53176317b200aad25f0 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Wed, 11 Mar 2026 01:02:21 -0700
Subject: [PATCH 001/280] anolis: Revert "fs/resctrl: Introduce interface to
 modify io_alloc capacity bitmasks"

ANBZ: #31045

This reverts commit 53711bd62266811f26e9b9305e1dd9f7129f42f8.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/resctrl.rst | 12 ----
 fs/resctrl/ctrlmondata.c           | 93 ------------------------------
 fs/resctrl/internal.h              |  2 -
 fs/resctrl/rdtgroup.c              |  3 +-
 4 files changed, 1 insertion(+), 109 deletions(-)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 86adf6840bcd..d6dcded555e6 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -196,18 +196,6 @@ related to allocation:
 			# cat /sys/fs/resctrl/info/L3/io_alloc_cbm
 			0=ffff;1=ffff
 
-		CBMs can be configured by writing to the interface.
-
-		Example::
-
-			# echo 1=ff > /sys/fs/resctrl/info/L3/io_alloc_cbm
-			# cat /sys/fs/resctrl/info/L3/io_alloc_cbm
-			0=ffff;1=00ff
-
-			# echo "0=ff;1=f" > /sys/fs/resctrl/info/L3/io_alloc_cbm
-			# cat /sys/fs/resctrl/info/L3/io_alloc_cbm
-			0=00ff;1=000f
-
 		When CDP is enabled "io_alloc_cbm" associated with the CDP_DATA and CDP_CODE
 		resources may reflect the same values. For example, values read from and
 		written to /sys/fs/resctrl/info/L3DATA/io_alloc_cbm may be reflected by
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index 6651e39c1cb8..2b101afca8e6 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -731,97 +731,4 @@ int resctrl_io_alloc_cbm_show(struct kernfs_open_file *of, struct seq_file *seq,
 	cpus_read_unlock();
 	return ret;
 }
-
-static int resctrl_io_alloc_parse_line(char *line,  struct rdt_resource *r,
-				       struct resctrl_schema *s, u32 closid)
-{
-	enum resctrl_conf_type peer_type;
-	struct rdt_parse_data data;
-	struct rdt_domain *d;
-	char *dom = NULL, *id;
-	unsigned long dom_id;
-
-next:
-	if (!line || line[0] == '\0')
-		return 0;
-
-	dom = strsep(&line, ";");
-	id = strsep(&dom, "=");
-	if (!dom || kstrtoul(id, 10, &dom_id)) {
-		rdt_last_cmd_puts("Missing '=' or non-numeric domain\n");
-		return -EINVAL;
-	}
-
-	dom = strim(dom);
-	list_for_each_entry(d, &r->domains, list) {
-		if (d->id == dom_id) {
-			data.buf = dom;
-			data.mode = RDT_MODE_SHAREABLE;
-			data.closid = closid;
-			if (parse_cbm(&data, s, d))
-				return -EINVAL;
-			/*
-			 * Keep io_alloc CLOSID's CBM of CDP_CODE and CDP_DATA
-			 * in sync.
-			 */
-			if (resctrl_arch_get_cdp_enabled(r->rid)) {
-				peer_type = resctrl_peer_type(s->conf_type);
-				memcpy(&d->staged_config[peer_type],
-				       &d->staged_config[s->conf_type],
-				       sizeof(d->staged_config[0]));
-			}
-			goto next;
-		}
-	}
-
-	return -EINVAL;
-}
-
-ssize_t resctrl_io_alloc_cbm_write(struct kernfs_open_file *of, char *buf,
-				   size_t nbytes, loff_t off)
-{
-	struct resctrl_schema *s = of->kn->parent->priv;
-	struct rdt_resource *r = s->res;
-	u32 io_alloc_closid;
-	int ret = 0;
-
-	/* Valid input requires a trailing newline */
-	if (nbytes == 0 || buf[nbytes - 1] != '\n')
-		return -EINVAL;
-
-	buf[nbytes - 1] = '\0';
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-	rdt_last_cmd_clear();
-
-	if (!r->cache.io_alloc_capable) {
-		rdt_last_cmd_printf("io_alloc is not supported on %s\n", s->name);
-		ret = -ENODEV;
-		goto out_unlock;
-	}
-
-	if (!resctrl_arch_get_io_alloc_enabled(r)) {
-		rdt_last_cmd_printf("io_alloc is not enabled on %s\n", s->name);
-		ret = -EINVAL;
-		goto out_unlock;
-	}
-
-	io_alloc_closid = resctrl_io_alloc_closid(r);
-
-	rdt_staged_configs_clear();
-	ret = resctrl_io_alloc_parse_line(buf, r, s, io_alloc_closid);
-	if (ret)
-		goto out_clear_configs;
-
-	ret = resctrl_arch_update_domains(r, io_alloc_closid);
-
-out_clear_configs:
-	rdt_staged_configs_clear();
-out_unlock:
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-
-	return ret ?: nbytes;
-}
 #endif
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index 3283448e5955..73cec0cc4c44 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -336,8 +336,6 @@ ssize_t resctrl_io_alloc_write(struct kernfs_open_file *of, char *buf,
 const char *rdtgroup_name_by_closid(u32 closid);
 int resctrl_io_alloc_cbm_show(struct kernfs_open_file *of, struct seq_file *seq,
 			      void *v);
-ssize_t resctrl_io_alloc_cbm_write(struct kernfs_open_file *of, char *buf,
-				   size_t nbytes, loff_t off);
 #endif
 
 #ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 457de2adc251..9e8861741db9 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -2470,10 +2470,9 @@ static struct rftype res_common_files[] = {
 	},
 	{
 		.name		= "io_alloc_cbm",
-		.mode		= 0644,
+		.mode		= 0444,
 		.kf_ops		= &rdtgroup_kf_single_ops,
 		.seq_show	= resctrl_io_alloc_cbm_show,
-		.write		= resctrl_io_alloc_cbm_write,
 	},
 #endif
 	{
-- 
Gitee


From eb11638df486196dd07c650c94ea50651762cc30 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Wed, 11 Mar 2026 01:02:36 -0700
Subject: [PATCH 002/280] anolis: Revert "fs/resctrl: Modify struct
 rdt_parse_data to pass mode and CLOSID"

ANBZ: #31045

This reverts commit 1e50ca047f6079c75da29582b6b644af602d63d8.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/ctrlmondata.c | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index 2b101afca8e6..fe505511447e 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -22,8 +22,7 @@
 #include "internal.h"
 
 struct rdt_parse_data {
-	u32			closid;
-	enum rdtgrp_mode	mode;
+	struct rdtgroup *rdtgrp;
 	char *buf;
 };
 
@@ -75,8 +74,8 @@ static int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
 		    struct rdt_domain *d)
 {
 	struct resctrl_staged_config *cfg;
+	u32 closid = data->rdtgrp->closid;
 	struct rdt_resource *r = s->res;
-	u32 closid = data->closid;
 	u32 bw_val;
 
 	cfg = &d->staged_config[s->conf_type];
@@ -154,10 +153,9 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
 static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 		     struct rdt_domain *d)
 {
-	enum rdtgrp_mode mode = data->mode;
+	struct rdtgroup *rdtgrp = data->rdtgrp;
 	struct resctrl_staged_config *cfg;
 	struct rdt_resource *r = s->res;
-	u32 closid = data->closid;
 	u32 cbm_val;
 
 	cfg = &d->staged_config[s->conf_type];
@@ -170,7 +168,7 @@ static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 	 * Cannot set up more than one pseudo-locked region in a cache
 	 * hierarchy.
 	 */
-	if (mode == RDT_MODE_PSEUDO_LOCKSETUP &&
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
 	    rdtgroup_pseudo_locked_in_hierarchy(d)) {
 		rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
 		return -EINVAL;
@@ -179,7 +177,8 @@ static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 	if (!cbm_validate(data->buf, &cbm_val, r))
 		return -EINVAL;
 
-	if ((mode == RDT_MODE_EXCLUSIVE || mode == RDT_MODE_SHAREABLE) &&
+	if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
+	     rdtgrp->mode == RDT_MODE_SHAREABLE) &&
 	    rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
 		rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
 		return -EINVAL;
@@ -189,14 +188,14 @@ static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 	 * The CBM may not overlap with the CBM of another closid if
 	 * either is exclusive.
 	 */
-	if (rdtgroup_cbm_overlaps(s, d, cbm_val, closid, true)) {
+	if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, true)) {
 		rdt_last_cmd_puts("Overlaps with exclusive group\n");
 		return -EINVAL;
 	}
 
-	if (rdtgroup_cbm_overlaps(s, d, cbm_val, closid, false)) {
-		if (mode == RDT_MODE_EXCLUSIVE ||
-		    mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+	if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, false)) {
+		if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
+		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
 			rdt_last_cmd_puts("Overlaps with other group\n");
 			return -EINVAL;
 		}
@@ -256,8 +255,7 @@ static int parse_line(char *line, struct resctrl_schema *s,
 	list_for_each_entry(d, &r->domains, list) {
 		if (d->id == dom_id) {
 			data.buf = dom;
-			data.closid = rdtgrp->closid;
-			data.mode = rdtgrp->mode;
+			data.rdtgrp = rdtgrp;
 			if (parse_ctrlval(&data, s, d))
 				return -EINVAL;
 			if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-- 
Gitee


From 064b8641386fc0c86a2c8c35327223c7984df876 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Wed, 11 Mar 2026 01:02:39 -0700
Subject: [PATCH 003/280] anolis: Revert "fs/resctrl: Introduce interface to
 display io_alloc CBMs"

ANBZ: #31045

This reverts commit 4248aeb0ae1202d096a88024d775a3548d96e8f9.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/resctrl.rst | 19 -------------
 fs/resctrl/ctrlmondata.c           | 45 ++----------------------------
 fs/resctrl/internal.h              |  2 --
 fs/resctrl/rdtgroup.c              | 11 +-------
 4 files changed, 4 insertions(+), 73 deletions(-)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index d6dcded555e6..cb6f68c20984 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -182,25 +182,6 @@ related to allocation:
 		available for general (CPU) cache allocation for both the CDP_CODE
 		and CDP_DATA resources.
 
-"io_alloc_cbm":
-		Capacity bitmasks that describe the portions of cache instances to
-		which I/O traffic from supported I/O devices are routed when "io_alloc"
-		is enabled.
-
-		CBMs are displayed in the following format:
-
-			<cache_id0>=<cbm>;<cache_id1>=<cbm>;...
-
-		Example::
-
-			# cat /sys/fs/resctrl/info/L3/io_alloc_cbm
-			0=ffff;1=ffff
-
-		When CDP is enabled "io_alloc_cbm" associated with the CDP_DATA and CDP_CODE
-		resources may reflect the same values. For example, values read from and
-		written to /sys/fs/resctrl/info/L3DATA/io_alloc_cbm may be reflected by
-		/sys/fs/resctrl/info/L3CODE/io_alloc_cbm and vice versa.
-
 Memory bandwidth(MB) subdirectory contains the following files
 with respect to allocation:
 
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index fe505511447e..7d7f1050b19e 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -374,8 +374,7 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 	return ret ?: nbytes;
 }
 
-static void show_doms(struct seq_file *s, struct resctrl_schema *schema,
-		      char *resource_name, int closid)
+static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
 {
 	struct rdt_resource *r = schema->res;
 	struct rdt_domain *dom;
@@ -385,8 +384,7 @@ static void show_doms(struct seq_file *s, struct resctrl_schema *schema,
 	/* Walking r->domains, ensure it can't race with cpuhp */
 	lockdep_assert_cpus_held();
 
-	if (resource_name)
-		seq_printf(s, "%*s:", max_name_width, resource_name);
+	seq_printf(s, "%*s:", max_name_width, schema->name);
 	list_for_each_entry(dom, &r->domains, list) {
 		if (sep)
 			seq_puts(s, ";");
@@ -433,7 +431,7 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
 			closid = rdtgrp->closid;
 			list_for_each_entry(schema, &resctrl_schema_all, list) {
 				if (closid < schema->num_closid)
-					show_doms(s, schema, schema->name, closid);
+					show_doms(s, schema, closid);
 			}
 		}
 	} else {
@@ -692,41 +690,4 @@ ssize_t resctrl_io_alloc_write(struct kernfs_open_file *of, char *buf,
 
 	return ret ?: nbytes;
 }
-
-int resctrl_io_alloc_cbm_show(struct kernfs_open_file *of, struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = of->kn->parent->priv;
-	struct rdt_resource *r = s->res;
-	int ret = 0;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	rdt_last_cmd_clear();
-
-	if (!r->cache.io_alloc_capable) {
-		rdt_last_cmd_printf("io_alloc is not supported on %s\n", s->name);
-		ret = -ENODEV;
-		goto out_unlock;
-	}
-
-	if (!resctrl_arch_get_io_alloc_enabled(r)) {
-		rdt_last_cmd_printf("io_alloc is not enabled on %s\n", s->name);
-		ret = -EINVAL;
-		goto out_unlock;
-	}
-
-	/*
-	 * When CDP is enabled, the CBMs of the highest CLOSID of CDP_CODE and
-	 * CDP_DATA are kept in sync. As a result, the io_alloc CBMs shown for
-	 * either CDP resource are identical and accurately represent the CBMs
-	 * used for I/O.
-	 */
-	show_doms(seq, s, NULL, resctrl_io_alloc_closid(r));
-
-out_unlock:
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-	return ret;
-}
 #endif
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index 73cec0cc4c44..b1d347e45e6a 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -334,8 +334,6 @@ ssize_t resctrl_io_alloc_write(struct kernfs_open_file *of, char *buf,
 			       size_t nbytes, loff_t off);
 
 const char *rdtgroup_name_by_closid(u32 closid);
-int resctrl_io_alloc_cbm_show(struct kernfs_open_file *of, struct seq_file *seq,
-			      void *v);
 #endif
 
 #ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 9e8861741db9..ba863bfa943e 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -2468,12 +2468,6 @@ static struct rftype res_common_files[] = {
 		.seq_show	= resctrl_io_alloc_show,
 		.write          = resctrl_io_alloc_write,
 	},
-	{
-		.name		= "io_alloc_cbm",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= resctrl_io_alloc_cbm_show,
-	},
 #endif
 	{
 		.name		= "max_threshold_occupancy",
@@ -2647,12 +2641,9 @@ static void io_alloc_init(void)
 {
 	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
 
-	if (r->cache.io_alloc_capable) {
+	if (r->cache.io_alloc_capable)
 		resctrl_file_fflags_init("io_alloc", RFTYPE_CTRL_INFO |
 					 RFTYPE_RES_CACHE);
-		resctrl_file_fflags_init("io_alloc_cbm",
-					 RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE);
-	}
 }
 #endif
 
-- 
Gitee


From 7ff27977e9d99b86a946b42f1ec9dbcc58eecc2f Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Wed, 11 Mar 2026 01:02:41 -0700
Subject: [PATCH 004/280] anolis: Revert "fs/resctrl: Add user interface to
 enable/disable io_alloc feature"

ANBZ: #31045

This reverts commit 990478714b9af10d1a4067a901c37681b2be92ea.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/resctrl.rst |  30 -------
 fs/resctrl/ctrlmondata.c           | 126 -----------------------------
 fs/resctrl/internal.h              |  11 ---
 fs/resctrl/rdtgroup.c              |  24 +-----
 4 files changed, 3 insertions(+), 188 deletions(-)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index cb6f68c20984..48c91e80ad60 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -73,11 +73,6 @@ The 'info' directory contains information about the enabled
 resources. Each resource has its own subdirectory. The subdirectory
 names reflect the resource names.
 
-Most of the files in the resource's subdirectory are read-only, and
-describe properties of the resource. Resources that support global
-configuration options also include writable files that can be used
-to modify those settings.
-
 Each subdirectory contains the following files with respect to
 allocation:
 
@@ -157,31 +152,6 @@ related to allocation:
 			"not supported":
 			      Support not available for this resource.
 
-		The feature can be modified by writing to the interface, for example:
-
-		To enable::
-
-			# echo 1 > /sys/fs/resctrl/info/L3/io_alloc
-
-		To disable::
-
-			# echo 0 > /sys/fs/resctrl/info/L3/io_alloc
-
-		The underlying implementation may reduce resources available to
-		general (CPU) cache allocation. See architecture specific notes
-		below. Depending on usage requirements the feature can be enabled
-		or disabled.
-
-		On AMD systems, io_alloc feature is supported by the L3 Smart
-		Data Cache Injection Allocation Enforcement (SDCIAE). The CLOSID for
-		io_alloc is the highest CLOSID supported by the resource. When
-		io_alloc is enabled, the highest CLOSID is dedicated to io_alloc and
-		no longer available for general (CPU) cache allocation. When CDP is
-		enabled, io_alloc routes I/O traffic using the highest CLOSID allocated
-		for the instruction cache (CDP_CODE), making this CLOSID no longer
-		available for general (CPU) cache allocation for both the CDP_CODE
-		and CDP_DATA resources.
-
 Memory bandwidth(MB) subdirectory contains the following files
 with respect to allocation:
 
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index 7d7f1050b19e..723725619ff1 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -564,130 +564,4 @@ int resctrl_io_alloc_show(struct kernfs_open_file *of, struct seq_file *seq, voi
 
 	return 0;
 }
-
-/*
- * resctrl_io_alloc_closid_supported() - io_alloc feature utilizes the
- * highest CLOSID value to direct I/O traffic. Ensure that io_alloc_closid
- * is in the supported range.
- */
-static bool resctrl_io_alloc_closid_supported(u32 io_alloc_closid)
-{
-	return io_alloc_closid < closids_supported();
-}
-
-/*
- * Initialize io_alloc CLOSID cache resource CBM with all usable (shared
- * and unused) cache portions.
- */
-static int resctrl_io_alloc_init_cbm(struct resctrl_schema *s, u32 closid)
-{
-	enum resctrl_conf_type peer_type;
-	struct rdt_resource *r = s->res;
-	struct rdt_domain *d;
-	int ret;
-
-	rdt_staged_configs_clear();
-
-	ret = rdtgroup_init_cat(s, closid);
-	if (ret < 0)
-		goto out;
-
-	/* Keep CDP_CODE and CDP_DATA of io_alloc CLOSID's CBM in sync. */
-	if (resctrl_arch_get_cdp_enabled(r->rid)) {
-		peer_type = resctrl_peer_type(s->conf_type);
-		list_for_each_entry(d, &s->res->domains, list)
-			memcpy(&d->staged_config[peer_type],
-			       &d->staged_config[s->conf_type],
-			       sizeof(d->staged_config[0]));
-	}
-
-	ret = resctrl_arch_update_domains(r, closid);
-out:
-	rdt_staged_configs_clear();
-	return ret;
-}
-
-/*
- * resctrl_io_alloc_closid() - io_alloc feature routes I/O traffic using
- * the highest available CLOSID. Retrieve the maximum CLOSID supported by the
- * resource. Note that if Code Data Prioritization (CDP) is enabled, the number
- * of available CLOSIDs is reduced by half.
- */
-static u32 resctrl_io_alloc_closid(struct rdt_resource *r)
-{
-	if (resctrl_arch_get_cdp_enabled(r->rid))
-		return resctrl_arch_get_num_closid(r) / 2  - 1;
-	else
-		return resctrl_arch_get_num_closid(r) - 1;
-}
-
-ssize_t resctrl_io_alloc_write(struct kernfs_open_file *of, char *buf,
-			       size_t nbytes, loff_t off)
-{
-	struct resctrl_schema *s = of->kn->parent->priv;
-	struct rdt_resource *r = s->res;
-	char const *grp_name;
-	u32 io_alloc_closid;
-	bool enable;
-	int ret;
-
-	ret = kstrtobool(buf, &enable);
-	if (ret)
-		return ret;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	rdt_last_cmd_clear();
-
-	if (!r->cache.io_alloc_capable) {
-		rdt_last_cmd_printf("io_alloc is not supported on %s\n", s->name);
-		ret = -ENODEV;
-		goto out_unlock;
-	}
-
-	/* If the feature is already up to date, no action is needed. */
-	if (resctrl_arch_get_io_alloc_enabled(r) == enable)
-		goto out_unlock;
-
-	io_alloc_closid = resctrl_io_alloc_closid(r);
-	if (!resctrl_io_alloc_closid_supported(io_alloc_closid)) {
-		rdt_last_cmd_printf("io_alloc CLOSID (ctrl_hw_id) %u is not available\n",
-				    io_alloc_closid);
-		ret = -EINVAL;
-		goto out_unlock;
-	}
-
-	if (enable) {
-		if (!closid_alloc_fixed(io_alloc_closid)) {
-			grp_name = rdtgroup_name_by_closid(io_alloc_closid);
-			WARN_ON_ONCE(!grp_name);
-			rdt_last_cmd_printf("CLOSID (ctrl_hw_id) %u for io_alloc is used by %s group\n",
-					    io_alloc_closid, grp_name ? grp_name : "another");
-			ret = -ENOSPC;
-			goto out_unlock;
-		}
-
-		ret = resctrl_io_alloc_init_cbm(s, io_alloc_closid);
-		if (ret) {
-			rdt_last_cmd_puts("Failed to initialize io_alloc allocations\n");
-			closid_free(io_alloc_closid);
-			goto out_unlock;
-		}
-	} else {
-		closid_free(io_alloc_closid);
-	}
-
-	ret = resctrl_arch_io_alloc_enable(r, enable);
-	if (enable && ret) {
-		rdt_last_cmd_puts("Failed to enable io_alloc feature\n");
-		closid_free(io_alloc_closid);
-	}
-
-out_unlock:
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-
-	return ret ?: nbytes;
-}
 #endif
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index b1d347e45e6a..f41b94a525c8 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -313,9 +313,6 @@ int mbm_cntr_alloc(struct rdt_resource *r);
 void mbm_cntr_free(u32 cntr_id);
 void rdt_staged_configs_clear(void);
 bool closid_allocated(unsigned int closid);
-
-bool closid_alloc_fixed(u32 closid);
-
 int resctrl_find_cleanest_closid(void);
 unsigned int mon_event_config_index_get(u32 evtid);
 int rdtgroup_assign_cntr(struct rdtgroup *rdtgrp, enum resctrl_event_id evtid);
@@ -326,14 +323,6 @@ void rdtgroup_free_cntr(struct rdt_resource *r, struct rdtgroup *rdtgrp, int ind
 #ifdef CONFIG_X86
 int resctrl_io_alloc_show(struct kernfs_open_file *of, struct seq_file *seq, void *v);
 
-int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid);
-
-enum resctrl_conf_type resctrl_peer_type(enum resctrl_conf_type my_type);
-
-ssize_t resctrl_io_alloc_write(struct kernfs_open_file *of, char *buf,
-			       size_t nbytes, loff_t off);
-
-const char *rdtgroup_name_by_closid(u32 closid);
 #endif
 
 #ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index ba863bfa943e..8c76d0234c94 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -238,11 +238,6 @@ void mbm_cntr_free(u32 cntr_id)
 	__set_bit(cntr_id, mbm_cntrs_free_map);
 }
 
-bool closid_alloc_fixed(u32 closid)
-{
-	return __test_and_clear_bit(closid, closid_free_map);
-}
-
 /**
  * rdtgroup_mode_by_closid - Return mode of resource group with closid
  * @closid: closid if the resource group
@@ -1712,7 +1707,7 @@ static int rdtgroup_mode_show(struct kernfs_open_file *of,
 	return 0;
 }
 
-enum resctrl_conf_type resctrl_peer_type(enum resctrl_conf_type my_type)
+static enum resctrl_conf_type resctrl_peer_type(enum resctrl_conf_type my_type)
 {
 	switch (my_type) {
 	case CDP_CODE:
@@ -2358,18 +2353,6 @@ int rdtgroup_unassign_cntr(struct rdtgroup *rdtgrp, enum resctrl_event_id evtid)
 	return 0;
 }
 
-const char *rdtgroup_name_by_closid(u32 closid)
-{
-	struct rdtgroup *rdtgrp;
-
-	list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
-		if (rdtgrp->closid == closid)
-			return rdtgrp->kn->name;
-	}
-
-	return NULL;
-}
-
 /* rdtgroup information files for one cache resource. */
 static struct rftype res_common_files[] = {
 	{
@@ -2463,10 +2446,9 @@ static struct rftype res_common_files[] = {
 #ifdef CONFIG_X86
 	{
 		.name		= "io_alloc",
-		.mode		= 0644,
+		.mode		= 0444,
 		.kf_ops		= &rdtgroup_kf_single_ops,
 		.seq_show	= resctrl_io_alloc_show,
-		.write          = resctrl_io_alloc_write,
 	},
 #endif
 	{
@@ -3852,7 +3834,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
  * If there are no more shareable bits available on any domain then
  * the entire allocation will fail.
  */
-int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
+static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
 {
 	struct rdt_domain *d;
 	int ret;
-- 
Gitee


From f1506b847c080fadf137f660c90e627497cbf679 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Wed, 11 Mar 2026 01:02:43 -0700
Subject: [PATCH 005/280] anolis: Revert "fs/resctrl: Introduce interface to
 display "io_alloc" support"

ANBZ: #31045

This reverts commit 4ea307d18a252175d4d6d8247b71450468add640.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/resctrl.rst | 15 ---------------
 fs/resctrl/ctrlmondata.c           | 23 -----------------------
 fs/resctrl/internal.h              |  5 -----
 fs/resctrl/rdtgroup.c              | 27 ---------------------------
 4 files changed, 70 deletions(-)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 48c91e80ad60..6753ced39454 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -137,21 +137,6 @@ related to allocation:
 			"1":
 			      Non-contiguous 1s value in CBM is supported.
 
-"io_alloc":
-		"io_alloc" enables system software to configure the portion of
-		the cache allocated for I/O traffic. File may only exist if the
-		system supports this feature on some of its cache resources.
-
-			"disabled":
-			      Resource supports "io_alloc" but the feature is disabled.
-			      Portions of cache used for allocation of I/O traffic cannot
-			      be configured.
-			"enabled":
-			      Portions of cache used for allocation of I/O traffic
-			      can be configured using "io_alloc_cbm".
-			"not supported":
-			      Support not available for this resource.
-
 Memory bandwidth(MB) subdirectory contains the following files
 with respect to allocation:
 
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index 723725619ff1..253443f87646 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -542,26 +542,3 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 	rdtgroup_kn_unlock(of->kn);
 	return ret;
 }
-
-#ifdef CONFIG_X86
-int resctrl_io_alloc_show(struct kernfs_open_file *of, struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = of->kn->parent->priv;
-	struct rdt_resource *r = s->res;
-
-	mutex_lock(&rdtgroup_mutex);
-
-	if (r->cache.io_alloc_capable) {
-		if (resctrl_arch_get_io_alloc_enabled(r))
-			seq_puts(seq, "enabled\n");
-		else
-			seq_puts(seq, "disabled\n");
-	} else {
-		seq_puts(seq, "not supported\n");
-	}
-
-	mutex_unlock(&rdtgroup_mutex);
-
-	return 0;
-}
-#endif
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index f41b94a525c8..58d812d6c1d2 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -320,11 +320,6 @@ int rdtgroup_alloc_cntr(struct rdtgroup *rdtgrp, int index);
 int rdtgroup_unassign_cntr(struct rdtgroup *rdtgrp, enum resctrl_event_id evtid);
 void rdtgroup_free_cntr(struct rdt_resource *r, struct rdtgroup *rdtgrp, int index);
 
-#ifdef CONFIG_X86
-int resctrl_io_alloc_show(struct kernfs_open_file *of, struct seq_file *seq, void *v);
-
-#endif
-
 #ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
 int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
 int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp);
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 8c76d0234c94..aba699474e86 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -2443,14 +2443,6 @@ static struct rftype res_common_files[] = {
 		.kf_ops		= &rdtgroup_kf_single_ops,
 		.seq_show	= rdt_thread_throttle_mode_show,
 	},
-#ifdef CONFIG_X86
-	{
-		.name		= "io_alloc",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= resctrl_io_alloc_show,
-	},
-#endif
 	{
 		.name		= "max_threshold_occupancy",
 		.mode		= 0644,
@@ -2613,22 +2605,6 @@ static struct rftype *rdtgroup_get_rftype_by_name(const char *name)
 	return NULL;
 }
 
-#ifdef CONFIG_X86
-/*
- * The resctrl file "io_alloc" is added using L3 resource. However, it results
- * in this file being visible for *all* cache resources (eg. L2 cache),
- * whether it supports "io_alloc" or not.
- */
-static void io_alloc_init(void)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-
-	if (r->cache.io_alloc_capable)
-		resctrl_file_fflags_init("io_alloc", RFTYPE_CTRL_INFO |
-					 RFTYPE_RES_CACHE);
-}
-#endif
-
 void resctrl_file_fflags_init(const char *config, unsigned long fflags)
 {
 	struct rftype *rft;
@@ -4702,9 +4678,6 @@ int resctrl_init(void)
 
 	resctrl_file_fflags_init("thread_throttle_mode",
 				 RFTYPE_CTRL_INFO | RFTYPE_RES_MB);
-#ifdef CONFIG_X86
-	io_alloc_init();
-#endif
 
 	ret = resctrl_mon_resource_init();
 	if (ret)
-- 
Gitee


From 0bb7363c60caab7a6f8eda99bbc29a1f6c70dc91 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Wed, 11 Mar 2026 01:02:44 -0700
Subject: [PATCH 006/280] anolis: Revert "x86,fs/resctrl: Implement "io_alloc"
 enable/disable handlers"

ANBZ: #31045

This reverts commit d25ffa678fc7b92983e28dcc8cb81d729a8b259d.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 40 -----------------------
 arch/x86/kernel/cpu/resctrl/internal.h    |  5 ---
 include/linux/resctrl.h                   | 21 ------------
 3 files changed, 66 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index b62792ad80ac..c5c3eaea27b6 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -119,43 +119,3 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
 
 	return hw_dom->ctrl_val[idx];
 }
-
-bool resctrl_arch_get_io_alloc_enabled(struct rdt_resource *r)
-{
-	return resctrl_to_arch_res(r)->sdciae_enabled;
-}
-
-static void resctrl_sdciae_set_one_amd(void *arg)
-{
-	bool *enable = arg;
-
-	if (*enable)
-		msr_set_bit(MSR_IA32_L3_QOS_EXT_CFG, SDCIAE_ENABLE_BIT);
-	else
-		msr_clear_bit(MSR_IA32_L3_QOS_EXT_CFG, SDCIAE_ENABLE_BIT);
-}
-
-static void _resctrl_sdciae_enable(struct rdt_resource *r, bool enable)
-{
-	struct rdt_domain *d;
-
-	/* Walking r->ctrl_domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	/* Update MSR_IA32_L3_QOS_EXT_CFG MSR on all the CPUs in all domains */
-	list_for_each_entry(d, &r->domains, list)
-		on_each_cpu_mask(&d->cpu_mask, resctrl_sdciae_set_one_amd, &enable, 1);
-}
-
-int resctrl_arch_io_alloc_enable(struct rdt_resource *r, bool enable)
-{
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-
-	if (hw_res->r_resctrl.cache.io_alloc_capable &&
-	    hw_res->sdciae_enabled != enable) {
-		_resctrl_sdciae_enable(r, enable);
-		hw_res->sdciae_enabled = enable;
-	}
-
-	return 0;
-}
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 41c912aa859c..9017fe146a86 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -55,9 +55,6 @@ struct arch_mbm_state {
 	u64	prev_msr;
 };
 
-/* Setting bit 1 in MSR_IA32_L3_QOS_EXT_CFG enables the SDCIAE feature. */
-#define SDCIAE_ENABLE_BIT		1
-
 /**
  * struct rdt_hw_domain - Arch private attributes of a set of CPUs that share
  *			  a resource
@@ -110,7 +107,6 @@ struct msr_param {
  * @mbm_width:		Monitor width, to detect and correct for overflow.
  * @cdp_enabled:	CDP state of this resource
  * @mbm_cntr_assign_enabled:	ABMC feature is enabled
- * @sdciae_enabled:	SDCIAE feature (backing "io_alloc") is enabled.
  *
  * Members of this structure are either private to the architecture
  * e.g. mbm_width, or accessed via helpers that provide abstraction. e.g.
@@ -126,7 +122,6 @@ struct rdt_hw_resource {
 	unsigned int		mbm_width;
 	bool			cdp_enabled;
 	bool			mbm_cntr_assign_enabled;
-	bool			sdciae_enabled;
 };
 
 static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r)
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 01bef03c0edd..aa99d3d58d5b 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -440,27 +440,6 @@ void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_domain *d,
  */
 void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_domain *d);
 
-/**
- * resctrl_arch_io_alloc_enable() - Enable/disable io_alloc feature.
- * @r:		The resctrl resource.
- * @enable:	Enable (true) or disable (false) io_alloc on resource @r.
- *
- * This can be called from any CPU.
- *
- * Return:
- * 0 on success, <0 on error.
- */
-int resctrl_arch_io_alloc_enable(struct rdt_resource *r, bool enable);
-
-/**
- * resctrl_arch_get_io_alloc_enabled() - Get io_alloc feature state.
- * @r:		The resctrl resource.
- *
- * Return:
- * true if io_alloc is enabled or false if disabled.
- */
-bool resctrl_arch_get_io_alloc_enabled(struct rdt_resource *r);
-
 extern unsigned int resctrl_rmid_realloc_threshold;
 extern unsigned int resctrl_rmid_realloc_limit;
 void resctrl_file_fflags_init(const char *config, unsigned long fflags);
-- 
Gitee


From 55a006c9be8806ece606fa7ee2b769bff91d6d55 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Wed, 11 Mar 2026 01:02:46 -0700
Subject: [PATCH 007/280] anolis: Revert "x86,fs/resctrl: Detect io_alloc
 feature"

ANBZ: #31045

This reverts commit 563adbb0dc2647ec381c9f06d48f1c4f8ce854d6.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c | 7 -------
 include/linux/resctrl.h            | 3 ---
 2 files changed, 10 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 9f1a439be5ab..10fd07ba4272 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -281,11 +281,6 @@ static void rdt_get_cdp_config(int level)
 	rdt_resources_all[level].r_resctrl.cdp_capable = true;
 }
 
-static void rdt_set_io_alloc_capable(struct rdt_resource *r)
-{
-	r->cache.io_alloc_capable = true;
-}
-
 static void rdt_get_cdp_l3_config(void)
 {
 	rdt_get_cdp_config(RDT_RESOURCE_L3);
@@ -781,8 +776,6 @@ static __init bool get_rdt_alloc_resources(void)
 		rdt_get_cache_alloc_cfg(1, r);
 		if (rdt_cpu_has(X86_FEATURE_CDP_L3))
 			rdt_get_cdp_l3_config();
-		if (rdt_cpu_has(X86_FEATURE_SDCIAE))
-			rdt_set_io_alloc_capable(r);
 		ret = true;
 	}
 	if (rdt_cpu_has(X86_FEATURE_CAT_L2)) {
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index aa99d3d58d5b..75dacdc47c8a 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -137,8 +137,6 @@ struct rdt_domain {
  * @arch_has_sparse_bitmasks:	True if a bitmask like f00f is valid.
  * @arch_has_per_cpu_cfg:	True if QOS_CFG register for this cache
  *				level has CPU scope.
- * @io_alloc_capable:	True if portion of the cache can be configured
- *			for I/O traffic.
  */
 struct resctrl_cache {
 	unsigned int	cbm_len;
@@ -146,7 +144,6 @@ struct resctrl_cache {
 	unsigned int	shareable_bits;
 	bool		arch_has_sparse_bitmasks;
 	bool		arch_has_per_cpu_cfg;
-	bool		io_alloc_capable;
 };
 
 /**
-- 
Gitee


From f02324b609472bb3792979ef59c46cfef016cb0d Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Wed, 11 Mar 2026 01:02:48 -0700
Subject: [PATCH 008/280] anolis: Revert "x86/resctrl: Add SDCIAE feature in
 the command line options"

ANBZ: #31045

This reverts commit 06296f8026df1f5146e19eac2c8d6ef09606d62d.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 .../admin-guide/kernel-parameters.txt         |  2 +-
 Documentation/arch/x86/resctrl.rst            | 23 +++++++++----------
 arch/x86/kernel/cpu/resctrl/core.c            |  2 --
 3 files changed, 12 insertions(+), 15 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index e0193a18f4fa..ae26c0b0f4fc 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5538,7 +5538,7 @@
 	rdt=		[HW,X86,RDT]
 			Turn on/off individual RDT features. List is:
 			cmt, mbmtotal, mbmlocal, l3cat, l3cdp, l2cat, l2cdp,
-			mba, smba, bmec, abmc, sdciae.
+			mba, smba, bmec, abmc.
 			E.g. to turn on cmt and turn off mba use:
 				rdt=cmt,!mba
 
diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 6753ced39454..11c827931f1b 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -17,18 +17,17 @@ AMD refers to this feature as AMD Platform Quality of Service(AMD QoS).
 This feature is enabled by the CONFIG_X86_CPU_RESCTRL and the x86 /proc/cpuinfo
 flag bits:
 
-=============================================================== ================================
-RDT (Resource Director Technology) Allocation			"rdt_a"
-CAT (Cache Allocation Technology)				"cat_l3", "cat_l2"
-CDP (Code and Data Prioritization)				"cdp_l3", "cdp_l2"
-CQM (Cache QoS Monitoring)					"cqm_llc", "cqm_occup_llc"
-MBM (Memory Bandwidth Monitoring)				"cqm_mbm_total", "cqm_mbm_local"
-MBA (Memory Bandwidth Allocation)				"mba"
-SMBA (Slow Memory Bandwidth Allocation)				""
-BMEC (Bandwidth Monitoring Event Configuration)			""
-ABMC (Assignable Bandwidth Monitoring Counters)			""
-SDCIAE (Smart Data Cache Injection Allocation Enforcement)	""
-=============================================================== ================================
+===============================================	================================
+RDT (Resource Director Technology) Allocation	"rdt_a"
+CAT (Cache Allocation Technology)		"cat_l3", "cat_l2"
+CDP (Code and Data Prioritization)		"cdp_l3", "cdp_l2"
+CQM (Cache QoS Monitoring)			"cqm_llc", "cqm_occup_llc"
+MBM (Memory Bandwidth Monitoring)		"cqm_mbm_total", "cqm_mbm_local"
+MBA (Memory Bandwidth Allocation)		"mba"
+SMBA (Slow Memory Bandwidth Allocation)         ""
+BMEC (Bandwidth Monitoring Event Configuration) ""
+ABMC (Assignable Bandwidth Monitoring Counters) ""
+===============================================	================================
 
 Historically, new features were made visible by default in /proc/cpuinfo. This
 resulted in the feature flags becoming hard to parse by humans. Adding a new
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 10fd07ba4272..526f58b8f26c 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -639,7 +639,6 @@ enum {
 	RDT_FLAG_SMBA,
 	RDT_FLAG_BMEC,
 	RDT_FLAG_ABMC,
-	RDT_FLAG_SDCIAE,
 };
 
 #define RDT_OPT(idx, n, f)	\
@@ -666,7 +665,6 @@ static struct rdt_options rdt_options[]  __ro_after_init = {
 	RDT_OPT(RDT_FLAG_SMBA,	    "smba",	X86_FEATURE_SMBA),
 	RDT_OPT(RDT_FLAG_BMEC,	    "bmec",	X86_FEATURE_BMEC),
 	RDT_OPT(RDT_FLAG_ABMC,	    "abmc",	X86_FEATURE_ABMC),
-	RDT_OPT(RDT_FLAG_SDCIAE,    "sdciae",	X86_FEATURE_SDCIAE),
 };
 #define NUM_RDT_OPTIONS ARRAY_SIZE(rdt_options)
 
-- 
Gitee


From 00a4f74e6aa96a963656f0c2010ddee917d92353 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Wed, 11 Mar 2026 01:02:50 -0700
Subject: [PATCH 009/280] anolis: Revert "x86/cpufeatures: Add support for L3
 Smart Data Cache Injection Allocation Enforcement"

ANBZ: #31045

This reverts commit 981fb50f4060831e91d7bae47ad80dba1d3d2112.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/cpufeatures.h | 2 --
 arch/x86/kernel/cpu/cpuid-deps.c   | 1 -
 arch/x86/kernel/cpu/scattered.c    | 1 -
 3 files changed, 4 deletions(-)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 5172ff7e623f..9a12e209939b 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -515,8 +515,6 @@
 #define X86_FEATURE_AMD_FAST_CPPC	(21*32 + 5) /* Fast CPPC */
 #define X86_FEATURE_AMD_WORKLOAD_CLASS	(21*32 + 7) /* Workload Classification */
 
-#define X86_FEATURE_SDCIAE		(21*32+18) /* L3 Smart Data Cache Injection Allocation Enforcement */
-
 /*
  * BUG word(s)
  */
diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c
index 8be2847473c4..d0714eb74eca 100644
--- a/arch/x86/kernel/cpu/cpuid-deps.c
+++ b/arch/x86/kernel/cpu/cpuid-deps.c
@@ -73,7 +73,6 @@ static const struct cpuid_dep cpuid_deps[] = {
 	{ X86_FEATURE_ABMC,			X86_FEATURE_CQM_MBM_TOTAL   },
 	{ X86_FEATURE_ABMC,			X86_FEATURE_CQM_MBM_LOCAL   },
 	{ X86_FEATURE_ABMC,			X86_FEATURE_BMEC      },
-	{ X86_FEATURE_SDCIAE,			X86_FEATURE_CAT_L3    },
 	{ X86_FEATURE_AVX512_BF16,		X86_FEATURE_AVX512VL  },
 	{ X86_FEATURE_AVX512_FP16,		X86_FEATURE_AVX512BW  },
 	{ X86_FEATURE_ENQCMD,			X86_FEATURE_XSAVES    },
diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c
index 0773ce13715f..509026d5c9cf 100644
--- a/arch/x86/kernel/cpu/scattered.c
+++ b/arch/x86/kernel/cpu/scattered.c
@@ -56,7 +56,6 @@ static const struct cpuid_bit cpuid_bits[] = {
 	{ X86_FEATURE_AMD_WORKLOAD_CLASS,	CPUID_EAX,  22, 0x80000021, 0 },
 	{ X86_FEATURE_PERFMON_V2,	CPUID_EAX,  0, 0x80000022, 0 },
 	{ X86_FEATURE_AMD_LBR_V2,	CPUID_EAX,  1, 0x80000022, 0 },
-	{ X86_FEATURE_SDCIAE,			CPUID_EBX,  6, 0x80000020, 0 },
 	{ X86_FEATURE_AMD_LBR_PMC_FREEZE,	CPUID_EAX,  2, 0x80000022, 0 },
 	{ 0, 0, 0, 0, 0 }
 };
-- 
Gitee


From c90639975ddcf5ba6cb1bc1dd584fc935f08b92c Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:29:18 -0800
Subject: [PATCH 010/280] anolis: Revert "anolis: x86/resctrl: Fix memory
 bandwidth counter width for Hygon CPUs"

ANBZ: #31045

This reverts commit 6e491b9f54ea3245a5c167b19e48c0502cf7169b.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     | 17 ++++-------------
 arch/x86/kernel/cpu/resctrl/internal.h |  3 ---
 2 files changed, 4 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 526f58b8f26c..996d61331546 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -922,19 +922,10 @@ void resctrl_cpu_detect(struct cpuinfo_x86 *c)
 		c->x86_cache_occ_scale = ebx;
 		c->x86_cache_mbm_width_offset = eax & 0xff;
 
-		if (!c->x86_cache_mbm_width_offset) {
-			switch (c->x86_vendor) {
-			case X86_VENDOR_AMD:
-				c->x86_cache_mbm_width_offset = MBM_CNTR_WIDTH_OFFSET_AMD;
-				break;
-			case X86_VENDOR_HYGON:
-				c->x86_cache_mbm_width_offset = MBM_CNTR_WIDTH_OFFSET_HYGON;
-				break;
-			default:
-				/* Leave c->x86_cache_mbm_width_offset as 0 */
-				break;
-			}
-		}
+		if ((c->x86_vendor == X86_VENDOR_AMD ||
+		     c->x86_vendor == X86_VENDOR_HYGON) &&
+		    !c->x86_cache_mbm_width_offset)
+			c->x86_cache_mbm_width_offset = MBM_CNTR_WIDTH_OFFSET_AMD;
 	}
 }
 
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 9017fe146a86..a7ff4f16247c 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -27,9 +27,6 @@
 
 #define MBM_CNTR_WIDTH_OFFSET_AMD	20
 
-/* Hygon MBM counter width as an offset from MBM_CNTR_WIDTH_BASE */
-#define MBM_CNTR_WIDTH_OFFSET_HYGON	8
-
 #define RMID_VAL_ERROR			BIT_ULL(63)
 #define RMID_VAL_UNAVAIL		BIT_ULL(62)
 
-- 
Gitee


From 0e199337700183cdf463d3f8875b4d267f70f846 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:32:08 -0800
Subject: [PATCH 011/280] anolis: Revert "x86/resctrl: Introduce interface to
 modify assignment states of the groups"

ANBZ: #31045

This reverts commit 87031530f949d6f95c57538d5c6f2e5a9e8bdc26.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/resctrl.rst |  94 +--------
 fs/resctrl/rdtgroup.c              | 315 +----------------------------
 include/linux/resctrl.h            |   7 -
 3 files changed, 2 insertions(+), 414 deletions(-)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 11c827931f1b..aaed239782e5 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -346,7 +346,7 @@ with the following files:
 	 t  MBM total event is enabled.
 	 l  MBM local event is enabled.
 	 tl Both total and local MBM events are enabled.
-	 _  None of the MBM events are enabled. Only works with opcode '=' for write.
+	 _  None of the MBM events are enabled.
 
 	Examples:
 	::
@@ -364,98 +364,6 @@ with the following files:
 	 There are four resctrl groups. All the groups have total and local MBM events
 	 enabled on domain 0 and 1.
 
-	Assignment state can be updated by writing to the interface.
-
-	Format is similar to the list format with addition of opcode for the
-	assignment operation.
-
-		"<CTRL_MON group>/<MON group>/<domain_id><opcode><flags>"
-
-	Format for each type of groups:
-
-        * Default CTRL_MON group:
-                "//<domain_id><opcode><flags>"
-
-        * Non-default CTRL_MON group:
-                "<CTRL_MON group>//<domain_id><opcode><flags>"
-
-        * Child MON group of default CTRL_MON group:
-                "/<MON group>/<domain_id><opcode><flags>"
-
-        * Child MON group of non-default CTRL_MON group:
-                "<CTRL_MON group>/<MON group>/<domain_id><opcode><flags>"
-
-	Domain_id '*' wil apply the flags on all the domains.
-
-	Opcode can be one of the following:
-	::
-
-	 = Update the assignment to match the MBM event.
-	 + Assign a MBM event.
-	 - Unassign a MBM event.
-
-	Examples:
-	::
-
-	  Initial group status:
-	  # cat /sys/fs/resctrl/info/L3_MON/mbm_control
-	  non_default_ctrl_mon_grp//0=tl;1=tl;
-	  non_default_ctrl_mon_grp/child_non_default_mon_grp/0=tl;1=tl;
-	  //0=tl;1=tl;
-	  /child_default_mon_grp/0=tl;1=tl;
-
-	  To update the default group to assign only total MBM event on domain 0:
-	  # echo "//0=t" > /sys/fs/resctrl/info/L3_MON/mbm_control
-
-	  Assignment status after the update:
-	  # cat /sys/fs/resctrl/info/L3_MON/mbm_control
-	  non_default_ctrl_mon_grp//0=tl;1=tl;
-	  non_default_ctrl_mon_grp/child_non_default_mon_grp/0=tl;1=tl;
-	  //0=t;1=tl;
-	  /child_default_mon_grp/0=tl;1=tl;
-
-	  To update the MON group child_default_mon_grp to remove total MBM event on domain 1:
-	  # echo "/child_default_mon_grp/1-t" > /sys/fs/resctrl/info/L3_MON/mbm_control
-
-	  Assignment status after the update:
-	  $ cat /sys/fs/resctrl/info/L3_MON/mbm_control
-	  non_default_ctrl_mon_grp//0=tl;1=tl;
-	  non_default_ctrl_mon_grp/child_non_default_mon_grp/0=tl;1=tl;
-	  //0=t;1=tl;
-	  /child_default_mon_grp/0=tl;1=l;
-
-	  To update the MON group non_default_ctrl_mon_grp/child_non_default_mon_grp to
-	  unassign both local and total MBM events on domain 1:
-	  # echo "non_default_ctrl_mon_grp/child_non_default_mon_grp/1=_" >
-			/sys/fs/resctrl/info/L3_MON/mbm_control
-
-	  Assignment status after the update:
-	  non_default_ctrl_mon_grp//0=tl;1=tl;
-	  non_default_ctrl_mon_grp/child_non_default_mon_grp/0=tl;1=_;
-	  //0=t;1=tl;
-	  /child_default_mon_grp/0=tl;1=l;
-
-	  To update the default group to add a local MBM event domain 0.
-	  # echo "//0+l" > /sys/fs/resctrl/info/L3_MON/mbm_control
-
-	  Assignment status after the update:
-	  # cat /sys/fs/resctrl/info/L3_MON/mbm_control
-	  non_default_ctrl_mon_grp//0=tl;1=tl;
-	  non_default_ctrl_mon_grp/child_non_default_mon_grp/0=tl;1=_;
-	  //0=tl;1=tl;
-	  /child_default_mon_grp/0=tl;1=l;
-
-	  To update the non default CTRL_MON group non_default_ctrl_mon_grp to unassign all
-	  the MBM events on all the domains.
-	  # echo "non_default_ctrl_mon_grp//*=_" > /sys/fs/resctrl/info/L3_MON/mbm_control
-
-	  Assignment status after the update:
-	  #cat /sys/fs/resctrl/info/L3_MON/mbm_control
-	  non_default_ctrl_mon_grp//0=_;1=_;
-	  non_default_ctrl_mon_grp/child_non_default_mon_grp/0=tl;1=_;
-	  //0=tl;1=tl;
-	  /child_default_mon_grp/0=tl;1=l;
-
 "max_threshold_occupancy":
 		Read/write file provides the largest value (in
 		bytes) at which a previously used LLC_occupancy
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index aba699474e86..e7a62537bc03 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -1043,318 +1043,6 @@ static int rdtgroup_mbm_control_show(struct kernfs_open_file *of,
 	return 0;
 }
 
-/*
- * Update the assign states for the domain.
- *
- * If this is a new assignment for the group then allocate a counter and update
- * the assignment else just update the assign state
- */
-static int rdtgroup_assign_update(struct rdtgroup *rdtgrp, enum resctrl_event_id evtid,
-				  struct rdt_domain *d)
-{
-	int ret, index;
-
-	index = mon_event_config_index_get(evtid);
-	if (index == INVALID_CONFIG_INDEX)
-                return -EINVAL;
-
-	if (rdtgrp->mon.cntr_id[index] == MON_CNTR_UNSET) {
-		ret = rdtgroup_alloc_cntr(rdtgrp, index);
-		if (ret < 0)
-			goto out_done;
-	}
-
-	/* Update the state on all domains if d == NULL */
-	if (d == NULL) {
-		ret = rdtgroup_assign_cntr(rdtgrp, evtid);
-	} else {
-		ret = resctrl_arch_assign_cntr(d, evtid, rdtgrp->mon.rmid,
-					       rdtgrp->mon.cntr_id[index],
-					       rdtgrp->closid, 1);
-		if (!ret)
-			set_bit(rdtgrp->mon.cntr_id[index], d->mbm_cntr_map);
-	}
-
-out_done:
-	return ret;
-}
-
-/*
- * Update the unassign state for the domain.
- *
- * Free the counter if it is unassigned on all the domains else just
- * update the unassign state
- */
-static int rdtgroup_unassign_update(struct rdtgroup *rdtgrp, enum resctrl_event_id evtid,
-				    struct rdt_domain *d)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	int ret = 0, index;
-
-	index = mon_event_config_index_get(evtid);
-	if (index == INVALID_CONFIG_INDEX)
-                return -EINVAL;
-
-	if (rdtgrp->mon.cntr_id[index] == MON_CNTR_UNSET)
-		goto out_done;
-
-	if (d == NULL) {
-		ret = rdtgroup_unassign_cntr(rdtgrp, evtid);
-	} else {
-		ret = resctrl_arch_assign_cntr(d, evtid, rdtgrp->mon.rmid,
-					       rdtgrp->mon.cntr_id[index],
-					       rdtgrp->closid, 0);
-		if (!ret) {
-			clear_bit(rdtgrp->mon.cntr_id[index], d->mbm_cntr_map);
-			rdtgroup_free_cntr(r, rdtgrp, index);
-		}
-	}
-
-out_done:
-	return ret;
-}
-
-static int rdtgroup_str_to_mon_state(char *flag)
-{
-	int i, mon_state = 0;
-
-	for (i = 0; i < strlen(flag); i++) {
-		switch (*(flag + i)) {
-		case 't':
-			mon_state |= ASSIGN_TOTAL;
-			break;
-		case 'l':
-			mon_state |= ASSIGN_LOCAL;
-			break;
-		case '_':
-			mon_state = ASSIGN_NONE;
-			break;
-		default:
-			break;
-		}
-	}
-
-	return mon_state;
-}
-
-static struct rdtgroup *rdtgroup_find_grp(enum rdt_group_type rtype, char *p_grp, char *c_grp)
-{
-	struct rdtgroup *rdtg, *crg;
-
-	if (rtype == RDTCTRL_GROUP && *p_grp == '\0') {
-		return &rdtgroup_default;
-	} else if (rtype == RDTCTRL_GROUP) {
-		list_for_each_entry(rdtg, &rdt_all_groups, rdtgroup_list)
-			if (!strcmp(p_grp, rdtg->kn->name))
-				return rdtg;
-	} else if (rtype == RDTMON_GROUP) {
-		list_for_each_entry(rdtg, &rdt_all_groups, rdtgroup_list) {
-			if (!strcmp(p_grp, rdtg->kn->name)) {
-				list_for_each_entry(crg, &rdtg->mon.crdtgrp_list,
-						    mon.crdtgrp_list) {
-					if (!strcmp(c_grp, crg->kn->name))
-						return crg;
-				}
-			}
-		}
-	}
-
-	return NULL;
-}
-
-static int rdtgroup_process_flags(struct rdt_resource *r,
-				  enum rdt_group_type rtype,
-				  char *p_grp, char *c_grp, char *tok)
-{
-	int op, mon_state, assign_state, unassign_state;
-	char *dom_str, *id_str, *op_str;
-	struct rdt_domain *d;
-	struct rdtgroup *rdtgrp;
-	unsigned long dom_id;
-	int ret, found = 0;
-
-	rdtgrp = rdtgroup_find_grp(rtype, p_grp, c_grp);
-
-	if (!rdtgrp) {
-		rdt_last_cmd_puts("Not a valid resctrl group\n");
-		return -EINVAL;
-	}
-
-next:
-	if (!tok || tok[0] == '\0')
-		return 0;
-
-	/* Start processing the strings for each domain */
-	dom_str = strim(strsep(&tok, ";"));
-
-	op_str = strpbrk(dom_str, "=+-");
-
-	if (op_str) {
-		op = *op_str;
-	} else {
-		rdt_last_cmd_puts("Missing operation =, +, -, _ character\n");
-		return -EINVAL;
-	}
-
-	id_str = strsep(&dom_str, "=+-");
-
-	/* Check for domain id '*' which means all domains */
-	if (id_str && *id_str == '*') {
-		d = NULL;
-		goto check_state;
-	} else if (!id_str || kstrtoul(id_str, 10, &dom_id)) {
-		rdt_last_cmd_puts("Missing domain id\n");
-		return -EINVAL;
-	}
-
-	/* Verify if the dom_id is valid */
-	list_for_each_entry(d, &r->domains, list) {
-		if (d->id == dom_id) {
-			found = 1;
-			break;
-		}
-	}
-
-	if (!found) {
-		rdt_last_cmd_printf("Invalid domain id %ld\n", dom_id);
-		return -EINVAL;
-	}
-
-check_state:
-	mon_state = rdtgroup_str_to_mon_state(dom_str);
-
-	assign_state = 0;
-	unassign_state = 0;
-
-	switch (op) {
-	case '+':
-		if (mon_state == ASSIGN_NONE) {
-			rdt_last_cmd_puts("Invalid assign opcode\n");
-			goto out_fail;
-		}
-		assign_state = mon_state;
-		break;
-	case '-':
-		if (mon_state == ASSIGN_NONE) {
-			rdt_last_cmd_puts("Invalid assign opcode\n");
-			goto out_fail;
-		}
-		unassign_state = mon_state;
-		break;
-	case '=':
-		assign_state = mon_state;
-		unassign_state = (ASSIGN_TOTAL | ASSIGN_LOCAL) & ~assign_state;
-		break;
-	default:
-		break;
-	}
-
-	if (assign_state & ASSIGN_TOTAL) {
-		ret = rdtgroup_assign_update(rdtgrp, QOS_L3_MBM_TOTAL_EVENT_ID, d);
-		if (ret)
-			goto out_fail;
-	}
-
-	if (assign_state & ASSIGN_LOCAL) {
-		ret = rdtgroup_assign_update(rdtgrp, QOS_L3_MBM_LOCAL_EVENT_ID, d);
-		if (ret)
-			goto out_fail;
-	}
-
-	if (unassign_state & ASSIGN_TOTAL) {
-		ret = rdtgroup_unassign_update(rdtgrp, QOS_L3_MBM_TOTAL_EVENT_ID, d);
-		if (ret)
-			goto out_fail;
-	}
-
-	if (unassign_state & ASSIGN_LOCAL) {
-		ret = rdtgroup_unassign_update(rdtgrp, QOS_L3_MBM_LOCAL_EVENT_ID, d);
-		if (ret)
-			goto out_fail;
-	}
-
-	goto next;
-
-out_fail:
-
-	return -EINVAL;
-}
-
-static ssize_t rdtgroup_mbm_control_write(struct kernfs_open_file *of,
-					  char *buf, size_t nbytes,
-					  loff_t off)
-{
-	struct rdt_resource *r = of->kn->parent->priv;
-	char *token, *cmon_grp, *mon_grp;
-	int ret;
-
-	if (!resctrl_arch_get_abmc_enabled())
-		return -EINVAL;
-
-	/* Valid input requires a trailing newline */
-	if (nbytes == 0 || buf[nbytes - 1] != '\n')
-		return -EINVAL;
-
-	buf[nbytes - 1] = '\0';
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-	rdt_last_cmd_clear();
-
-	while ((token = strsep(&buf, "\n")) != NULL) {
-		if (strstr(token, "//")) {
-			/*
-			 * The CTRL_MON group processing:
-			 * default CTRL_MON group: "//<flags>"
-			 * non-default CTRL_MON group: "<CTRL_MON group>//flags"
-			 * The CTRL_MON group will be empty string if it is a
-			 * default group.
-			 */
-			cmon_grp = strsep(&token, "//");
-
-			/*
-			 * strsep returns empty string for contiguous delimiters.
-			 * Make sure check for two consecutive delimiters and
-			 * advance the token.
-			 */
-			mon_grp = strsep(&token, "//");
-			if (*mon_grp != '\0') {
-				rdt_last_cmd_printf("Invalid CTRL_MON group format %s\n", token);
-				ret = -EINVAL;
-				break;
-			}
-
-			ret = rdtgroup_process_flags(r, RDTCTRL_GROUP, cmon_grp, mon_grp, token);
-			if (ret)
-				break;
-		} else if (strstr(token, "/")) {
-			/*
-			 * MON group processing:
-			 * MON_GROUP inside default CTRL_MON group: "/<MON group>/<flags>"
-			 * MON_GROUP within CTRL_MON group: "<CTRL_MON group>/<MON group>/<flags>"
-			 */
-			cmon_grp = strsep(&token, "/");
-
-			/* Extract the MON_GROUP. It cannot be empty string */
-			mon_grp = strsep(&token, "/");
-			if (*mon_grp == '\0') {
-				rdt_last_cmd_printf("Invalid MON_GROUP format %s\n", token);
-				ret = -EINVAL;
-				break;
-			}
-
-			ret = rdtgroup_process_flags(r, RDTMON_GROUP, cmon_grp, mon_grp, token);
-			if (ret)
-				break;
-		}
-	}
-
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-
-	return ret ?: nbytes;
-}
-
 #ifdef CONFIG_PROC_CPU_RESCTRL
 
 /*
@@ -2489,10 +2177,9 @@ static struct rftype res_common_files[] = {
 	},
 	{
 		.name		= "mbm_control",
-		.mode		= 0644,
+		.mode		= 0444,
 		.kf_ops		= &rdtgroup_kf_single_ops,
 		.seq_show	= rdtgroup_mbm_control_show,
-		.write		= rdtgroup_mbm_control_write,
 	},
 	{
 		.name		= "cpus_list",
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 75dacdc47c8a..1c5d3361a71f 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -274,13 +274,6 @@ struct resctrl_mon_config_info {
 	int                  err;
 };
 
-/*
- * Assignment flags for ABMC feature
- */
-#define ASSIGN_NONE			0
-#define ASSIGN_TOTAL			BIT(QOS_L3_MBM_TOTAL_EVENT_ID)
-#define ASSIGN_LOCAL			BIT(QOS_L3_MBM_LOCAL_EVENT_ID)
-
 /**
  * mon_event_config_index_get - get the hardware index for the
  *                              configurable event
-- 
Gitee


From b4ded3aea5651c9b5a5b5f873af1edc5d0936fab Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:32:51 -0800
Subject: [PATCH 012/280] anolis: Revert "x86/resctrl: Introduce interface to
 list monitor states of all the groups"

ANBZ: #31045

This reverts commit 76def6384268a3f0ad89d617a7fc37ce1ee1451a.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/resctrl.rst     | 44 ---------------
 arch/x86/include/asm/resctrl.h         |  1 -
 arch/x86/kernel/cpu/resctrl/monitor.c  |  1 -
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |  8 ---
 fs/resctrl/rdtgroup.c                  | 74 --------------------------
 include/linux/arm_mpam.h               |  5 --
 6 files changed, 133 deletions(-)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index aaed239782e5..c61057728ad7 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -320,50 +320,6 @@ with the following files:
 	the counter is not assigned to the event when read. Users need to assign a
 	counter manually to read the events.
 
-"mbm_control":
-	Reports the resctrl group and monitor status of each group.
-
-	List follows the following format:
-		"<CTRL_MON group>/<MON group>/<domain_id>=<flags>"
-
-	Format for specific type of groups:
-
-	* Default CTRL_MON group:
-		"//<domain_id>=<flags>"
-
-	* Non-default CTRL_MON group:
-		"<CTRL_MON group>//<domain_id>=<flags>"
-
-	* Child MON group of default CTRL_MON group:
-		"/<MON group>/<domain_id>=<flags>"
-
-	* Child MON group of non-default CTRL_MON group:
-		"<CTRL_MON group>/<MON group>/<domain_id>=<flags>"
-
-	Flags can be one of the following:
-	::
-
-	 t  MBM total event is enabled.
-	 l  MBM local event is enabled.
-	 tl Both total and local MBM events are enabled.
-	 _  None of the MBM events are enabled.
-
-	Examples:
-	::
-
-	 # mkdir /sys/fs/resctrl/mon_groups/child_default_mon_grp
-	 # mkdir /sys/fs/resctrl/non_default_ctrl_mon_grp
-	 # mkdir /sys/fs/resctrl/non_default_ctrl_mon_grp/mon_groups/child_non_default_mon_grp
-
-	 # cat /sys/fs/resctrl/info/L3_MON/mbm_control
-	 non_default_ctrl_mon_grp//0=tl;1=tl;
-	 non_default_ctrl_mon_grp/child_non_default_mon_grp/0=tl;1=tl;
-	 //0=tl;1=tl;
-	 /child_default_mon_grp/0=tl;1=tl;
-
-	 There are four resctrl groups. All the groups have total and local MBM events
-	 enabled on domain 0 and 1.
-
 "max_threshold_occupancy":
 		Read/write file provides the largest value (in
 		bytes) at which a previously used LLC_occupancy
diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 7ea7c3d7b5be..2db0d95f9dc5 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -219,7 +219,6 @@ static inline void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid,
 int resctrl_arch_mbm_cntr_assign_enable(void);
 void resctrl_arch_mbm_cntr_assign_configure(void);
 void resctrl_arch_mbm_cntr_assign_disable(void);
-bool resctrl_arch_get_mbm_cntr_assign_enable(void);
 
 void resctrl_arch_event_config_set(void *info);
 u32 resctrl_arch_event_config_get(void *d, enum resctrl_event_id eventid);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 0ed28ef8c25a..ee8519f51359 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -257,7 +257,6 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 			r->mon.num_mbm_cntrs = 64;
 
 		resctrl_file_fflags_init("num_mbm_cntrs", RFTYPE_MON_INFO);
-		resctrl_file_fflags_init("mbm_control", RFTYPE_MON_INFO);
 	}
 
 	/*
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 50a49a1ea604..964f2614695a 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -391,14 +391,6 @@ void resctrl_arch_mbm_cntr_assign_disable(void)
 	}
 }
 
-bool resctrl_arch_get_mbm_cntr_assign_enable(void)
-{
-	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-
-	return hw_res->mbm_cntr_assign_enabled;
-}
-
 static void rdtgroup_abmc_cfg(void *info)
 {
 	u64 *msrval = info;
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index e7a62537bc03..722e2ace8624 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -975,74 +975,6 @@ static int rdtgroup_num_mbm_cntrs_show(struct kernfs_open_file *of,
 	return 0;
 }
 
-static char *rdtgroup_mon_state_to_str(struct rdtgroup *rdtgrp,
-				       struct rdt_domain *d, char *str)
-{
-	char *tmp = str;
-	int index;
-
-	/*
-	 * Query the monitor state for the domain.
-	 * Index 0 for evtid == QOS_L3_MBM_TOTAL_EVENT_ID
-	 * Index 1 for evtid == QOS_L3_MBM_LOCAL_EVENT_ID
-	 */
-	index = mon_event_config_index_get(QOS_L3_MBM_TOTAL_EVENT_ID);
-	if (rdtgrp->mon.cntr_id[index] != MON_CNTR_UNSET &&
-	    test_bit(rdtgrp->mon.cntr_id[index], d->mbm_cntr_map))
-		*tmp++ = 't';
-
-	index = mon_event_config_index_get(QOS_L3_MBM_LOCAL_EVENT_ID);
-	if (rdtgrp->mon.cntr_id[index] != MON_CNTR_UNSET &&
-	    test_bit(rdtgrp->mon.cntr_id[index], d->mbm_cntr_map))
-		*tmp++ = 'l';
-
-	if (tmp == str)
-		*tmp++ = '_';
-
-	*tmp = '\0';
-	return str;
-}
-
-static int rdtgroup_mbm_control_show(struct kernfs_open_file *of,
-				     struct seq_file *s, void *v)
-{
-	struct rdt_resource *r = of->kn->parent->priv;
-	struct rdt_domain *dom;
-	struct rdtgroup *rdtg;
-	char str[10];
-
-	if (!resctrl_arch_get_mbm_cntr_assign_enable()) {
-		rdt_last_cmd_puts("ABMC feature is not enabled\n");
-		return -EINVAL;
-	}
-
-	mutex_lock(&rdtgroup_mutex);
-
-	list_for_each_entry(rdtg, &rdt_all_groups, rdtgroup_list) {
-		struct rdtgroup *crg;
-
-		seq_printf(s, "%s//", rdtg->kn->name);
-
-		list_for_each_entry(dom, &r->domains, list)
-			seq_printf(s, "%d=%s;", dom->id,
-				   rdtgroup_mon_state_to_str(rdtg, dom, str));
-		seq_putc(s, '\n');
-
-		list_for_each_entry(crg, &rdtg->mon.crdtgrp_list,
-				    mon.crdtgrp_list) {
-			seq_printf(s, "%s/%s/", rdtg->kn->name, crg->kn->name);
-
-			list_for_each_entry(dom, &r->domains, list)
-				seq_printf(s, "%d=%s;", dom->id,
-					   rdtgroup_mon_state_to_str(crg, dom, str));
-			seq_putc(s, '\n');
-		}
-	}
-
-	mutex_unlock(&rdtgroup_mutex);
-	return 0;
-}
-
 #ifdef CONFIG_PROC_CPU_RESCTRL
 
 /*
@@ -2175,12 +2107,6 @@ static struct rftype res_common_files[] = {
 		.kf_ops		= &rdtgroup_kf_single_ops,
 		.seq_show	= rdtgroup_num_mbm_cntrs_show,
 	},
-	{
-		.name		= "mbm_control",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdtgroup_mbm_control_show,
-	},
 	{
 		.name		= "cpus_list",
 		.mode		= 0644,
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index c7698dda09fb..d55bc53ffbed 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -146,11 +146,6 @@ void resctrl_arch_event_config_set(void *info);
 u32 resctrl_arch_event_config_get(void *dom,
 						enum resctrl_event_id eventid);
 
-static inline bool resctrl_arch_get_mbm_cntr_assign_enable(void)
-{
-	return false;
-}
-
 static inline int resctrl_arch_assign_cntr(void *dom, enum resctrl_event_id evtid,
 			     u32 rmid, u32 cntr_id, u32 closid, bool assign)
 {
-- 
Gitee


From 4da52efb6e89562d668c3215499b6d0e286be439 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:33:03 -0800
Subject: [PATCH 013/280] anolis: Revert "x86/resctrl: Enable AMD ABMC feature
 by default when supported"

ANBZ: #31045

This reverts commit 207abf1fc4b4526791dc8fb9d12750de439a64e7.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h         |  1 -
 arch/x86/kernel/cpu/resctrl/core.c     |  2 --
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 17 -----------------
 include/linux/arm_mpam.h               |  2 --
 4 files changed, 22 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 2db0d95f9dc5..a2958efa9375 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -217,7 +217,6 @@ static inline void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid,
 					     void *ctx) { };
 
 int resctrl_arch_mbm_cntr_assign_enable(void);
-void resctrl_arch_mbm_cntr_assign_configure(void);
 void resctrl_arch_mbm_cntr_assign_disable(void);
 
 void resctrl_arch_event_config_set(void *info);
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 996d61331546..7a70a55a5162 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -510,7 +510,6 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 		cpumask_set_cpu(cpu, &d->cpu_mask);
 		if (r->cache.arch_has_per_cpu_cfg)
 			rdt_domain_reconfigure_cdp(r);
-		resctrl_arch_mbm_cntr_assign_configure();
 		return;
 	}
 
@@ -532,7 +531,6 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 	}
 
 	resctrl_mbm_evt_config_init(hw_dom);
-	resctrl_arch_mbm_cntr_assign_configure();
 
 	if (r->mon_capable && arch_domain_mbm_alloc(r->mon.num_rmid, hw_dom)) {
 		domain_free(hw_dom);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 964f2614695a..0739cb5c65cf 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -361,23 +361,6 @@ int resctrl_arch_mbm_cntr_assign_enable(void)
 	return 0;
 }
 
-void resctrl_arch_mbm_cntr_assign_configure(void)
-{
-	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-	bool enable = true;
-
-	mutex_lock(&rdtgroup_mutex);
-
-	if (r->mon.mbm_cntr_assignable) {
-		if (!hw_res->mbm_cntr_assign_enabled)
-			hw_res->mbm_cntr_assign_enabled = true;
-		resctrl_abmc_set_one_amd(&enable);
-	}
-
-	mutex_unlock(&rdtgroup_mutex);
-}
-
 void resctrl_arch_mbm_cntr_assign_disable(void)
 {
 	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index d55bc53ffbed..12785ba2441e 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -128,8 +128,6 @@ static inline void resctrl_arch_disable_mon(void) { }
 static inline void resctrl_arch_enable_alloc(void) { }
 static inline void resctrl_arch_disable_alloc(void) { }
 
-static inline void resctrl_arch_mbm_cntr_assign_configure(void) { }
-
 static inline bool resctrl_arch_get_abmc_enabled(void)
 {
 	return false;
-- 
Gitee


From cb0f027f9c4b8d347aee3a6e8883bb90cc7534d2 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:33:11 -0800
Subject: [PATCH 014/280] anolis: Revert "x86/resctrl: Introduce the interface
 to switch between monitor modes"

ANBZ: #31045

This reverts commit ed82ee7b8eab3dd174bf1a83040d3a9772a7b46b.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/resctrl.rst | 15 --------
 fs/resctrl/rdtgroup.c              | 62 +-----------------------------
 2 files changed, 1 insertion(+), 76 deletions(-)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index c61057728ad7..4e5f5e9da229 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -291,21 +291,6 @@ with the following files:
 		as long as there are enough RMID counters available to support number
 		of monitoring groups.
 
-	* To enable ABMC feature:
-	  ::
-
-	    # echo  "mbm_cntr_assign" > /sys/fs/resctrl/info/L3_MON/mbm_mode
-
-	* To enable the legacy monitoring feature:
-	  ::
-
-	    # echo  "legacy" > /sys/fs/resctrl/info/L3_MON/mbm_mode
-
-	The MBM event counters will reset when mbm_mode is changed. Moving to
-	mbm_cntr_assign will require users to assign the counters to the events to
-	read the events. Otherwise, the MBM event counters will return "Unassigned"
-	when read.
-
 "num_mbm_cntrs":
 	The number of monitoring counters available for assignment.
 
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 722e2ace8624..8b1839b4271c 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -906,65 +906,6 @@ static int rdtgroup_mbm_mode_show(struct kernfs_open_file *of,
 	return 0;
 }
 
-static void rdtgroup_mbm_cntr_reset(struct rdt_resource *r)
-{
-	struct rdtgroup *prgrp, *crgrp;
-	struct rdt_domain *dom;
-
-	mbm_cntrs_init(r);
-
-	list_for_each_entry(dom, &r->domains, list)
-		bitmap_zero(dom->mbm_cntr_map, r->mon.num_mbm_cntrs);
-
-	/* Reset the cntr_id's for all the monitor groups */
-	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
-		prgrp->mon.cntr_id[0] = MON_CNTR_UNSET;
-		prgrp->mon.cntr_id[1] = MON_CNTR_UNSET;
-		list_for_each_entry(crgrp, &prgrp->mon.crdtgrp_list,
-				    mon.crdtgrp_list) {
-			crgrp->mon.cntr_id[0] = MON_CNTR_UNSET;
-			crgrp->mon.cntr_id[1] = MON_CNTR_UNSET;
-		}
-	}
-}
-
-static ssize_t rdtgroup_mbm_mode_write(struct kernfs_open_file *of,
-				       char *buf, size_t nbytes,
-				       loff_t off)
-{
-	int mbm_cntr_assign = resctrl_arch_get_abmc_enabled();
-	struct rdt_resource *r = of->kn->parent->priv;
-	int ret = 0;
-
-	/* Valid input requires a trailing newline */
-	if (nbytes == 0 || buf[nbytes - 1] != '\n')
-		return -EINVAL;
-
-	buf[nbytes - 1] = '\0';
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	rdt_last_cmd_clear();
-
-	if (!strcmp(buf, "legacy")) {
-		if (mbm_cntr_assign)
-			resctrl_arch_mbm_cntr_assign_disable();
-	} else if (!strcmp(buf, "mbm_cntr_assign")) {
-		if (!mbm_cntr_assign) {
-			rdtgroup_mbm_cntr_reset(r);
-			ret = resctrl_arch_mbm_cntr_assign_enable();
-		}
-	} else {
-		ret = -EINVAL;
-	}
-
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-
-	return ret ?: nbytes;
-}
-
 static int rdtgroup_num_mbm_cntrs_show(struct kernfs_open_file *of,
 				       struct seq_file *s, void *v)
 {
@@ -2087,10 +2028,9 @@ static struct rftype res_common_files[] = {
 	},
 	{
 		.name		= "mbm_mode",
-		.mode		= 0644,
+		.mode		= 0444,
 		.kf_ops		= &rdtgroup_kf_single_ops,
 		.seq_show	= rdtgroup_mbm_mode_show,
-		.write		= rdtgroup_mbm_mode_write,
 		.fflags		= RFTYPE_MON_INFO,
 	},
 	{
-- 
Gitee


From 126c37d421d063d16691858dfb68c8ccbe428aef Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:33:17 -0800
Subject: [PATCH 015/280] anolis: Revert "x86/resctrl: Report "Unassigned" for
 MBM events in ABMC mode"

ANBZ: #31045

This reverts commit 321afaa12ea1cd0f56bc989f4f2d1d4366813ad9.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/resctrl.rst | 11 -----------
 fs/resctrl/ctrlmondata.c           | 14 +-------------
 2 files changed, 1 insertion(+), 24 deletions(-)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 4e5f5e9da229..4594f740eb67 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -294,17 +294,6 @@ with the following files:
 "num_mbm_cntrs":
 	The number of monitoring counters available for assignment.
 
-	Resctrl subsystem provides the interface to count maximum of two
-	MBM events per group, from a combination of total and local events.
-	Keeping the current interface, users can assign a maximum of two
-	monitoring counters per group. User will also have the option to
-	enable only one counter to the group.
-
-	With limited number of counters, system can run out of assignable counters.
-	In mbm_cntr_assign mode, the MBM event counters will return "Unassigned" if
-	the counter is not assigned to the event when read. Users need to assign a
-	counter manually to read the events.
-
 "max_threshold_occupancy":
 		Read/write file provides the largest value (in
 		bytes) at which a previously used LLC_occupancy
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index 253443f87646..f5cdabe2ee9e 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -497,7 +497,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 	union mon_data_bits md;
 	struct rdt_domain *d;
 	struct rmid_read rr;
-	int ret = 0, index;
+	int ret = 0;
 
 	rdtgrp = rdtgroup_kn_lock_live(of->kn);
 	if (!rdtgrp) {
@@ -517,24 +517,12 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 		goto out;
 	}
 
-	if (resctrl_arch_get_abmc_enabled() && evtid != QOS_L3_OCCUP_EVENT_ID) {
-		index = mon_event_config_index_get(evtid);
-		if (index != INVALID_CONFIG_INDEX &&
-		    rdtgrp->mon.cntr_id[index] == MON_CNTR_UNSET) {
-			rr.err = -ENOENT;
-			goto checkresult;
-		}
-	}
-
 	mon_event_read(&rr, r, d, rdtgrp, evtid, false);
 
-checkresult:
 	if (rr.err == -EIO)
 		seq_puts(m, "Error\n");
 	else if (rr.err == -EINVAL)
 		seq_puts(m, "Unavailable\n");
-	else if (rr.err == -ENOENT)
-		seq_puts(m, "Unassigned\n");
 	else
 		seq_printf(m, "%llu\n", rr.val);
 
-- 
Gitee


From 933bef844ca5288bf31e032e2106f62b5d205fd3 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:34:53 -0800
Subject: [PATCH 016/280] anolis: Revert "x86/resctrl: Assign/unassign counters
 by default when ABMC is enabled"

ANBZ: #31045

This reverts commit 25441d0598356841e5e862b7af522c777d3ec50f.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/rdtgroup.c | 55 -------------------------------------------
 1 file changed, 55 deletions(-)

diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 8b1839b4271c..5d0901d7f09e 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -2668,46 +2668,6 @@ static void schemata_list_destroy(void)
 	}
 }
 
-/*
- * Called when new group is created. Assign the counters if ABMC is
- * already enabled. Two counters are required per group, one for total
- * event and one for local event. With limited number of counters,
- * the assignments can fail in some cases. But, it is not required to
- * fail the group creation. Users have the option to modify the
- * assignments after the group creation.
- */
-static int rdtgroup_assign_cntrs(struct rdtgroup *rdtgrp)
-{
-	int ret = 0;
-
-	if (!resctrl_arch_get_abmc_enabled())
-		return 0;
-
-	if (resctrl_arch_is_mbm_total_enabled())
-		ret = rdtgroup_assign_cntr(rdtgrp, QOS_L3_MBM_TOTAL_EVENT_ID);
-
-	if (!ret && resctrl_arch_is_mbm_local_enabled())
-		ret = rdtgroup_assign_cntr(rdtgrp, QOS_L3_MBM_LOCAL_EVENT_ID);
-
-	return ret;
-}
-
-static int rdtgroup_unassign_cntrs(struct rdtgroup *rdtgrp)
-{
-	int ret = 0;
-
-	if (!resctrl_arch_get_abmc_enabled())
-		return 0;
-
-	if (resctrl_arch_is_mbm_total_enabled())
-		ret = rdtgroup_unassign_cntr(rdtgrp, QOS_L3_MBM_TOTAL_EVENT_ID);
-
-	if (!ret && resctrl_arch_is_mbm_local_enabled())
-		ret = rdtgroup_unassign_cntr(rdtgrp, QOS_L3_MBM_LOCAL_EVENT_ID);
-
-	return ret;
-}
-
 static int rdt_get_tree(struct fs_context *fc)
 {
 	struct rdt_resource *l3 = resctrl_arch_get_resource(RDT_RESOURCE_L3);
@@ -2769,8 +2729,6 @@ static int rdt_get_tree(struct fs_context *fc)
 		if (ret < 0)
 			goto out_mongrp;
 		rdtgroup_default.mon.mon_data_kn = kn_mondata;
-
-		rdtgroup_assign_cntrs(&rdtgroup_default);
 	}
 
 	ret = rdt_pseudo_lock_init();
@@ -2800,7 +2758,6 @@ static int rdt_get_tree(struct fs_context *fc)
 out_psl:
 	rdt_pseudo_lock_release();
 out_mondata:
-	rdtgroup_unassign_cntrs(&rdtgroup_default);
 	if (resctrl_arch_mon_capable())
 		kernfs_remove(kn_mondata);
 out_mongrp:
@@ -3048,8 +3005,6 @@ static void rdt_kill_sb(struct super_block *sb)
 		resctrl_arch_disable_alloc();
 	if (resctrl_arch_mon_capable())
 		resctrl_arch_disable_mon();
-
-	rdtgroup_unassign_cntrs(&rdtgroup_default);
 	resctrl_mounted = false;
 	kernfs_kill_sb(sb);
 	mutex_unlock(&rdtgroup_mutex);
@@ -3582,8 +3537,6 @@ static int rdtgroup_mkdir_mon(struct kernfs_node *parent_kn,
 		goto out_unlock;
 	}
 
-	rdtgroup_assign_cntrs(rdtgrp);
-
 	kernfs_activate(rdtgrp->kn);
 
 	/*
@@ -3628,8 +3581,6 @@ static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn,
 	if (ret)
 		goto out_closid_free;
 
-	rdtgroup_assign_cntrs(rdtgrp);
-
 	kernfs_activate(rdtgrp->kn);
 
 	ret = rdtgroup_init_alloc(rdtgrp);
@@ -3655,7 +3606,6 @@ static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn,
 out_del_list:
 	list_del(&rdtgrp->rdtgroup_list);
 out_rmid_free:
-	rdtgroup_unassign_cntrs(rdtgrp);
 	mkdir_rdt_prepare_rmid_free(rdtgrp);
 out_closid_free:
 	closid_free(closid);
@@ -3730,9 +3680,6 @@ static int rdtgroup_rmdir_mon(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
 	update_closid_rmid(tmpmask, NULL);
 
 	rdtgrp->flags = RDT_DELETED;
-
-	rdtgroup_unassign_cntrs(rdtgrp);
-
 	free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
 
 	/*
@@ -3780,8 +3727,6 @@ static int rdtgroup_rmdir_ctrl(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
 	cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask);
 	update_closid_rmid(tmpmask, NULL);
 
-	rdtgroup_unassign_cntrs(rdtgrp);
-
 	free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
 	closid_free(rdtgrp->closid);
 
-- 
Gitee


From 189ed88d344a66ee323e74fec2f6f15fa24b5f92 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:34:59 -0800
Subject: [PATCH 017/280] anolis: Revert "x86/resctrl: Add the interface to
 unassign a MBM counter"

ANBZ: #31045

This reverts commit 5c1e22737e211e6c7630a07a207828b64a0a3bee.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/internal.h |  2 --
 fs/resctrl/rdtgroup.c | 52 -------------------------------------------
 2 files changed, 54 deletions(-)

diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index 58d812d6c1d2..638734c63dcf 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -317,8 +317,6 @@ int resctrl_find_cleanest_closid(void);
 unsigned int mon_event_config_index_get(u32 evtid);
 int rdtgroup_assign_cntr(struct rdtgroup *rdtgrp, enum resctrl_event_id evtid);
 int rdtgroup_alloc_cntr(struct rdtgroup *rdtgrp, int index);
-int rdtgroup_unassign_cntr(struct rdtgroup *rdtgrp, enum resctrl_event_id evtid);
-void rdtgroup_free_cntr(struct rdt_resource *r, struct rdtgroup *rdtgrp, int index);
 
 #ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
 int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 5d0901d7f09e..af402df1e9e8 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -1862,58 +1862,6 @@ int rdtgroup_assign_cntr(struct rdtgroup *rdtgrp, enum resctrl_event_id evtid)
 	return 0;
 }
 
-static int rdtgroup_mbm_cntr_test(struct rdt_resource *r, u32 cntr_id)
-{
-	struct rdt_domain *d;
-
-	list_for_each_entry(d, &r->domains, list)
-		if (test_bit(cntr_id, d->mbm_cntr_map))
-			return 1;
-
-	return 0;
-}
-
-/* Free the counter id after the event is unassigned */
-void rdtgroup_free_cntr(struct rdt_resource *r, struct rdtgroup *rdtgrp,
-			int index)
-{
-	/* Update the counter bitmap */
-	if (!rdtgroup_mbm_cntr_test(r, rdtgrp->mon.cntr_id[index])) {
-		mbm_cntr_free(rdtgrp->mon.cntr_id[index]);
-		rdtgrp->mon.cntr_id[index] = MON_CNTR_UNSET;
-	}
-}
-
-/*
- * Unassign a hardware counter from the group and update all the domains
- * in the group.
- */
-int rdtgroup_unassign_cntr(struct rdtgroup *rdtgrp, enum resctrl_event_id evtid)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	struct rdt_domain *d;
-	int index;
-
-	index = mon_event_config_index_get(evtid);
-	if (index == INVALID_CONFIG_INDEX)
-		return -EINVAL;
-
-	if (rdtgrp->mon.cntr_id[index] != MON_CNTR_UNSET) {
-		list_for_each_entry(d, &r->domains, list) {
-			resctrl_arch_assign_cntr(d, evtid, rdtgrp->mon.rmid,
-						 rdtgrp->mon.cntr_id[index],
-						 rdtgrp->closid, false);
-			clear_bit(rdtgrp->mon.cntr_id[index],
-				  d->mbm_cntr_map);
-		}
-
-		/* Free the counter at group level */
-		rdtgroup_free_cntr(r, rdtgrp, index);
-	}
-
-	return 0;
-}
-
 /* rdtgroup information files for one cache resource. */
 static struct rftype res_common_files[] = {
 	{
-- 
Gitee


From 3af9aacb48ba511bd39fd8886b9f0c3e6a2ff295 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:35:05 -0800
Subject: [PATCH 018/280] anolis: Revert "x86/resctrl: Add the interface to
 assign a hardware counter"

ANBZ: #31045

This reverts commit 53014429148a0d942d33bbacc56c247836755582.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h         |  3 --
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 44 ---------------------
 fs/resctrl/internal.h                  |  2 -
 fs/resctrl/rdtgroup.c                  | 54 --------------------------
 include/linux/arm_mpam.h               |  7 ----
 5 files changed, 110 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index a2958efa9375..405fa1d9bae4 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -222,9 +222,6 @@ void resctrl_arch_mbm_cntr_assign_disable(void);
 void resctrl_arch_event_config_set(void *info);
 u32 resctrl_arch_event_config_get(void *d, enum resctrl_event_id eventid);
 
-int resctrl_arch_assign_cntr(void *dom, enum resctrl_event_id evtid,
-			     u32 rmid, u32 cntr_id, u32 closid, bool assign);
-
 u64 resctrl_arch_get_prefetch_disable_bits(void);
 int resctrl_arch_pseudo_lock_fn(void *_plr);
 int resctrl_arch_measure_cycles_lat_fn(void *_plr);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 0739cb5c65cf..517562950edb 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -374,50 +374,6 @@ void resctrl_arch_mbm_cntr_assign_disable(void)
 	}
 }
 
-static void rdtgroup_abmc_cfg(void *info)
-{
-	u64 *msrval = info;
-
-	wrmsrl(MSR_IA32_L3_QOS_ABMC_CFG, *msrval);
-}
-
-/*
- * Send an IPI to the domain to assign the counter id to RMID.
- */
-int resctrl_arch_assign_cntr(void *dom, enum resctrl_event_id evtid,
-			     u32 rmid, u32 cntr_id, u32 closid, bool assign)
-{
-	struct rdt_domain *d = dom;
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
-	union l3_qos_abmc_cfg abmc_cfg = { 0 };
-	struct arch_mbm_state *arch_mbm;
-
-	abmc_cfg.split.cfg_en = 1;
-	abmc_cfg.split.cntr_en = assign ? 1 : 0;
-	abmc_cfg.split.cntr_id = cntr_id;
-	abmc_cfg.split.bw_src = rmid;
-
-	/* Update the event configuration from the domain */
-	if (evtid == QOS_L3_MBM_TOTAL_EVENT_ID) {
-		abmc_cfg.split.bw_type = hw_dom->mbm_total_cfg;
-		arch_mbm = &hw_dom->arch_mbm_total[rmid];
-	} else {
-		abmc_cfg.split.bw_type = hw_dom->mbm_local_cfg;
-		arch_mbm = &hw_dom->arch_mbm_local[rmid];
-	}
-
-	smp_call_function_any(&d->cpu_mask, rdtgroup_abmc_cfg, &abmc_cfg, 1);
-
-	/*
-	 * Reset the architectural state so that reading of hardware
-	 * counter is not considered as an overflow in next update.
-	 */
-	if (arch_mbm)
-		memset(arch_mbm, 0, sizeof(struct arch_mbm_state));
-
-	return 0;
-}
-
 static int reset_all_ctrls(struct rdt_resource *r)
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index 638734c63dcf..f04516092c85 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -315,8 +315,6 @@ void rdt_staged_configs_clear(void);
 bool closid_allocated(unsigned int closid);
 int resctrl_find_cleanest_closid(void);
 unsigned int mon_event_config_index_get(u32 evtid);
-int rdtgroup_assign_cntr(struct rdtgroup *rdtgrp, enum resctrl_event_id evtid);
-int rdtgroup_alloc_cntr(struct rdtgroup *rdtgrp, int index);
 
 #ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
 int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index af402df1e9e8..80213fd361b6 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -1808,60 +1808,6 @@ static ssize_t mbm_local_bytes_config_write(struct kernfs_open_file *of,
 	return ret ?: nbytes;
 }
 
-/* Allocate a new counter id if the event is unassigned */
-int rdtgroup_alloc_cntr(struct rdtgroup *rdtgrp, int index)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	int cntr_id;
-
-	/* Nothing to do if event has been assigned already */
-	if (rdtgrp->mon.cntr_id[index] != MON_CNTR_UNSET) {
-		rdt_last_cmd_puts("ABMC counter is assigned already\n");
-		return 0;
-	}
-
-	/*
-	 * Allocate a new counter id and update domains
-	 */
-	cntr_id = mbm_cntr_alloc(r);
-	if (cntr_id < 0) {
-		rdt_last_cmd_puts("Out of ABMC counters\n");
-		return -ENOSPC;
-	}
-
-	rdtgrp->mon.cntr_id[index] = cntr_id;
-
-	return 0;
-}
-
-/*
- * Assign a hardware counter to the group and assign the counter
- * all the domains in the group. It will try to allocate the mbm
- * counter if the counter is available.
- */
-int rdtgroup_assign_cntr(struct rdtgroup *rdtgrp, enum resctrl_event_id evtid)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	struct rdt_domain *d;
-	int index;
-
-	index = mon_event_config_index_get(evtid);
-	if (index == INVALID_CONFIG_INDEX)
-		return -EINVAL;
-
-	if (rdtgroup_alloc_cntr(rdtgrp, index))
-		return -EINVAL;
-
-	list_for_each_entry(d, &r->domains, list) {
-		resctrl_arch_assign_cntr(d, evtid, rdtgrp->mon.rmid,
-					 rdtgrp->mon.cntr_id[index],
-					 rdtgrp->closid, true);
-		set_bit(rdtgrp->mon.cntr_id[index], d->mbm_cntr_map);
-	}
-
-	return 0;
-}
-
 /* rdtgroup information files for one cache resource. */
 static struct rftype res_common_files[] = {
 	{
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index 12785ba2441e..bfd30d93c3d1 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -143,11 +143,4 @@ static inline void resctrl_arch_mbm_cntr_assign_disable(void) { }
 void resctrl_arch_event_config_set(void *info);
 u32 resctrl_arch_event_config_get(void *dom,
 						enum resctrl_event_id eventid);
-
-static inline int resctrl_arch_assign_cntr(void *dom, enum resctrl_event_id evtid,
-			     u32 rmid, u32 cntr_id, u32 closid, bool assign)
-{
-	return -EINVAL;
-}
-
 #endif /* __LINUX_ARM_MPAM_H */
-- 
Gitee


From 63512463273c6eb9ad4116eede12a7656eabeef8 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:35:10 -0800
Subject: [PATCH 019/280] anolis: Revert "x86/resctrl: Introduce cntr_id in
 mongroup for assignments"

ANBZ: #31045

This reverts commit fefac429a993c8b4514c32747b3f81547085d4c8.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/internal.h | 7 -------
 fs/resctrl/rdtgroup.c | 6 ------
 2 files changed, 13 deletions(-)

diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index f04516092c85..7620f8a5ce50 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -11,11 +11,6 @@
 
 #include <asm/resctrl.h>
 
-/* Maximum assignable counters per resctrl group */
-#define MAX_CNTRS			2
-
-#define MON_CNTR_UNSET			U32_MAX
-
 /**
  * cpumask_any_housekeeping() - Choose any CPU in @mask, preferring those that
  *			        aren't marked nohz_full
@@ -160,14 +155,12 @@ enum rdtgrp_mode {
  * @parent:			parent rdtgrp
  * @crdtgrp_list:		child rdtgroup node list
  * @rmid:			rmid for this rdtgroup
- * @cntr_id:			Counter ids for assignment
  */
 struct mongroup {
 	struct kernfs_node	*mon_data_kn;
 	struct rdtgroup		*parent;
 	struct list_head	crdtgrp_list;
 	u32			rmid;
-	u32			cntr_id[MAX_CNTRS];
 };
 
 /**
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 80213fd361b6..de27579019b9 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -3295,9 +3295,6 @@ static int mkdir_rdt_prepare_rmid_alloc(struct rdtgroup *rdtgrp)
 	}
 	rdtgrp->mon.rmid = ret;
 
-	rdtgrp->mon.cntr_id[0] = MON_CNTR_UNSET;
-	rdtgrp->mon.cntr_id[1] = MON_CNTR_UNSET;
-
 	ret = mkdir_mondata_all(rdtgrp->kn, rdtgrp, &rdtgrp->mon.mon_data_kn);
 	if (ret) {
 		rdt_last_cmd_puts("kernfs subdir error\n");
@@ -3860,9 +3857,6 @@ static void rdtgroup_setup_default(void)
 	rdtgroup_default.closid = RESCTRL_RESERVED_CLOSID;
 	rdtgroup_default.mon.rmid = RESCTRL_RESERVED_RMID;
 	rdtgroup_default.type = RDTCTRL_GROUP;
-	rdtgroup_default.mon.cntr_id[0] = MON_CNTR_UNSET;
-	rdtgroup_default.mon.cntr_id[1] = MON_CNTR_UNSET;
-
 	INIT_LIST_HEAD(&rdtgroup_default.mon.crdtgrp_list);
 
 	list_add(&rdtgroup_default.rdtgroup_list, &rdt_all_groups);
-- 
Gitee


From 2842ebe13a7f37a71805e6b24410e14a138032cb Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:35:16 -0800
Subject: [PATCH 020/280] anolis: Revert "x86/resctrl: Add data structures and
 definitions for ABMC assignment"

ANBZ: #31045

This reverts commit 55f81edfe99110b5d3ce8c4d480bff0f0ac60073.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/msr-index.h       |  2 --
 arch/x86/kernel/cpu/resctrl/internal.h | 26 --------------------------
 2 files changed, 28 deletions(-)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 39d111515bd0..5bcafbf648a7 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -1195,8 +1195,6 @@
 #define MSR_IA32_SMBA_BW_BASE		0xc0000280
 #define MSR_IA32_EVT_CFG_BASE		0xc0000400
 #define MSR_IA32_L3_QOS_EXT_CFG		0xc00003ff
-#define MSR_IA32_L3_QOS_ABMC_CFG	0xc00003fd
-#define MSR_IA32_L3_QOS_ABMC_DSC	0xc00003fe
 
 /* MSR_IA32_VMX_MISC bits */
 #define MSR_IA32_VMX_MISC_INTEL_PT                 (1ULL << 14)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index a7ff4f16247c..993dfb942f9c 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -190,32 +190,6 @@ union cpuid_0x10_x_edx {
 	unsigned int full;
 };
 
-/*
- * ABMC counters can be configured by writing to L3_QOS_ABMC_CFG.
- * @bw_type		: Bandwidth configuration(supported by BMEC)
- *			  tracked by the @cntr_id.
- * @bw_src		: Bandwidth source (RMID or CLOSID).
- * @reserved1		: Reserved.
- * @is_clos		: @bw_src field is a CLOSID (not an RMID).
- * @cntr_id		: Counter identifier.
- * @reserved		: Reserved.
- * @cntr_en		: Tracking enable bit.
- * @cfg_en		: Configuration enable bit.
- */
-union l3_qos_abmc_cfg {
-	struct {
-		unsigned long	bw_type	:32,
-				bw_src	:12,
-				reserved1: 3,
-				is_clos	: 1,
-				cntr_id	: 5,
-				reserved : 9,
-				cntr_en	: 1,
-				cfg_en	: 1;
-	} split;
-	unsigned long full;
-};
-
 void rdt_ctrl_update(void *arg);
 int rdt_get_mon_l3_config(struct rdt_resource *r);
 bool rdt_cpu_has(int flag);
-- 
Gitee


From 11ba496117d83300199b27c9ad5854190bea2210 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:35:24 -0800
Subject: [PATCH 021/280] anolis: Revert "x86/resctrl: Introduce mbm_cntr_map
 to track counters at domain"

ANBZ: #31045

This reverts commit 135a18a2811089c67be5d759f5312d4416dee6c0.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/rdtgroup.c   | 10 ----------
 include/linux/resctrl.h |  2 --
 2 files changed, 12 deletions(-)

diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index de27579019b9..e8a44bfb7846 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -3866,7 +3866,6 @@ static void rdtgroup_setup_default(void)
 
 static void domain_destroy_mon_state(struct rdt_domain *d)
 {
-	bitmap_free(d->mbm_cntr_map);
 	bitmap_free(d->rmid_busy_llc);
 	kfree(d->mbm_total);
 	kfree(d->mbm_local);
@@ -3937,15 +3936,6 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
 			return -ENOMEM;
 		}
 	}
-	if (resctrl_is_mbm_enabled()) {
-		d->mbm_cntr_map = bitmap_zalloc(r->mon.num_mbm_cntrs, GFP_KERNEL);
-		if (!d->mbm_cntr_map) {
-			bitmap_free(d->rmid_busy_llc);
-			kfree(d->mbm_total);
-			kfree(d->mbm_local);
-			return -ENOMEM;
-		}
-	}
 
 	return 0;
 }
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 1c5d3361a71f..70f87231853d 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -102,7 +102,6 @@ struct resctrl_staged_config {
  * @cqm_limbo:		worker to periodically read CQM h/w counters
  * @mbm_work_cpu:	worker CPU for MBM h/w counters
  * @cqm_work_cpu:	worker CPU for CQM h/w counters
- * @mbm_cntr_map:	bitmap to track domain counter assignment
  * @plr:		pseudo-locked region (if any) associated with domain
  * @staged_config:	parsed configuration to be applied
  * @mbps_val:		When mba_sc is enabled, this holds the array of user
@@ -120,7 +119,6 @@ struct rdt_domain {
 	struct delayed_work		cqm_limbo;
 	int				mbm_work_cpu;
 	int				cqm_work_cpu;
-	unsigned long			*mbm_cntr_map;
 	struct pseudo_lock_region	*plr;
 	struct resctrl_staged_config	staged_config[CDP_NUM_TYPES];
 	u32				*mbps_val;
-- 
Gitee


From 1ee5fbc90bed0adb066f11d5643a0f99a4a3a16a Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:35:30 -0800
Subject: [PATCH 022/280] anolis: Revert "x86/resctrl: Remove MSR reading of
 event configuration value"

ANBZ: #31045

This reverts commit e481c8b2b5c7c5ef95ef3521111c2235a87bd5d0.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h         |  3 --
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 50 --------------------------
 drivers/platform/mpam/mpam_internal.h  |  2 --
 drivers/platform/mpam/mpam_resctrl.c   |  6 ++--
 fs/resctrl/rdtgroup.c                  | 32 ++++++++++-------
 include/linux/arm_mpam.h               |  3 --
 include/linux/resctrl.h                |  2 ++
 include/linux/resctrl_types.h          | 21 +++++++++++
 8 files changed, 45 insertions(+), 74 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 405fa1d9bae4..dec669838b39 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -219,9 +219,6 @@ static inline void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid,
 int resctrl_arch_mbm_cntr_assign_enable(void);
 void resctrl_arch_mbm_cntr_assign_disable(void);
 
-void resctrl_arch_event_config_set(void *info);
-u32 resctrl_arch_event_config_get(void *d, enum resctrl_event_id eventid);
-
 u64 resctrl_arch_get_prefetch_disable_bits(void);
 int resctrl_arch_pseudo_lock_fn(void *_plr);
 int resctrl_arch_measure_cycles_lat_fn(void *_plr);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 517562950edb..a0b27a82099c 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -421,53 +421,3 @@ void resctrl_arch_reset_resources(void)
 	for_each_capable_rdt_resource(r)
 		reset_all_ctrls(r);
 }
-
-u32 resctrl_arch_event_config_get(void *dom, enum resctrl_event_id eventid)
-{
-	struct rdt_domain *d = dom;
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
-
-	switch (eventid) {
-	case QOS_L3_OCCUP_EVENT_ID:
-	case QOS_MC_MBM_BPS_EVENT_ID:
-		break;
-	case QOS_L3_MBM_TOTAL_EVENT_ID:
-		return hw_dom->mbm_total_cfg;
-	case QOS_L3_MBM_LOCAL_EVENT_ID:
-		return hw_dom->mbm_local_cfg;
-	}
-
-	/* Never expect to get here */
-	WARN_ON_ONCE(1);
-
-	return INVALID_CONFIG_VALUE;
-}
-
-void resctrl_arch_event_config_set(void *info)
-{
-	struct resctrl_mon_config_info *mon_info = info;
-	struct rdt_hw_domain *hw_dom;
-	unsigned int index;
-
-	index = mon_event_config_index_get(mon_info->evtid);
-	if (index == INVALID_CONFIG_INDEX)
-		return;
-
-	wrmsr(MSR_IA32_EVT_CFG_BASE + index, mon_info->mon_config, 0);
-
-	hw_dom = resctrl_to_arch_dom(mon_info->d);
-
-	switch (mon_info->evtid) {
-	case QOS_L3_OCCUP_EVENT_ID:
-	case QOS_MC_MBM_BPS_EVENT_ID:
-		break;
-	case QOS_L3_MBM_TOTAL_EVENT_ID:
-		hw_dom->mbm_total_cfg = mon_info->mon_config;
-		break;
-	case QOS_L3_MBM_LOCAL_EVENT_ID:
-		hw_dom->mbm_local_cfg =  mon_info->mon_config;
-		break;
-	}
-
-	mon_info->err = 0;
-}
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index c46af5caa90c..d84413e5e031 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -24,8 +24,6 @@ DECLARE_STATIC_KEY_FALSE(mpam_enabled);
  * Only these event configuration bits are supported. MPAM can't know if
  * data is being written back, these will show up as a write.
  */
-#define READS_TO_LOCAL_MEM             BIT(0)
-#define NON_TEMP_WRITE_TO_LOCAL_MEM    BIT(2)
 #define MPAM_RESTRL_EVT_CONFIG_VALID	(READS_TO_LOCAL_MEM | NON_TEMP_WRITE_TO_LOCAL_MEM)
 
 static inline bool mpam_is_enabled(void)
diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index ee1a66a6c099..242dcf69066e 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -741,18 +741,16 @@ bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt)
 	}
 }
 
-u32 resctrl_arch_event_config_get(void *info, enum resctrl_event_id eventid)
+void resctrl_arch_mon_event_config_read(void *info)
 {
 	struct mpam_resctrl_dom *dom;
 	struct resctrl_mon_config_info *mon_info = info;
 
 	dom = container_of(mon_info->d, struct mpam_resctrl_dom, resctrl_dom);
 	mon_info->mon_config = dom->mbm_local_evt_cfg & MAX_EVT_CONFIG_BITS;
-
-	return mon_info->mon_config;
 }
 
-void resctrl_arch_event_config_set(void *info)
+void resctrl_arch_mon_event_config_write(void *info)
 {
 	struct mpam_resctrl_dom *dom;
 	struct resctrl_mon_config_info *mon_info = info;
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index e8a44bfb7846..9a2f1734dee5 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -1616,11 +1616,17 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 	return ret;
 }
 
+static void mondata_config_read(struct resctrl_mon_config_info *mon_info)
+{
+	smp_call_function_any(&mon_info->d->cpu_mask,
+			      resctrl_arch_mon_event_config_read, mon_info, 1);
+}
+
 static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid)
 {
+	struct resctrl_mon_config_info mon_info = {0};
 	struct rdt_domain *dom;
 	bool sep = false;
-	u32 val;
 
 	cpus_read_lock();
 	mutex_lock(&rdtgroup_mutex);
@@ -1629,11 +1635,13 @@ static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid
 		if (sep)
 			seq_puts(s, ";");
 
-		val = resctrl_arch_event_config_get(dom, evtid);
-		if (val == INVALID_CONFIG_VALUE)
-			break;
+		memset(&mon_info, 0, sizeof(struct resctrl_mon_config_info));
+		mon_info.r = r;
+		mon_info.d = dom;
+		mon_info.evtid = evtid;
+		mondata_config_read(&mon_info);
 
-		seq_printf(s, "%d=0x%02x", dom->id, val);
+		seq_printf(s, "%d=0x%02x", dom->id, mon_info.mon_config);
 		sep = true;
 	}
 	seq_puts(s, "\n");
@@ -1668,18 +1676,18 @@ static int mbm_config_write_domain(struct rdt_resource *r,
 				   struct rdt_domain *d, u32 evtid, u32 val)
 {
 	struct resctrl_mon_config_info mon_info = {0};
-	u32 config_val;
 
 	/*
-	 * Check the current config value first. If both are the same then
+	 * Read the current config value first. If both are the same then
 	 * no need to write it again.
 	 */
-	config_val = resctrl_arch_event_config_get(d, evtid);
-	if (config_val == INVALID_CONFIG_VALUE || config_val == val)
-		return 0;
-
+	mon_info.r = r;
 	mon_info.d = d;
 	mon_info.evtid = evtid;
+	mondata_config_read(&mon_info);
+	if (mon_info.mon_config == val)
+		return 0;
+
 	mon_info.mon_config = val;
 
 	/*
@@ -1688,7 +1696,7 @@ static int mbm_config_write_domain(struct rdt_resource *r,
 	 * are scoped at the domain level. Writing any of these MSRs
 	 * on one CPU is observed by all the CPUs in the domain.
 	 */
-	smp_call_function_any(&d->cpu_mask, resctrl_arch_event_config_set,
+	smp_call_function_any(&d->cpu_mask, resctrl_arch_mon_event_config_write,
 			      &mon_info, 1);
 	if (mon_info.err) {
 		rdt_last_cmd_puts("Invalid event configuration\n");
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index bfd30d93c3d1..398ae2afa5dd 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -140,7 +140,4 @@ static inline int resctrl_arch_mbm_cntr_assign_enable(void)
 
 static inline void resctrl_arch_mbm_cntr_assign_disable(void) { }
 
-void resctrl_arch_event_config_set(void *info);
-u32 resctrl_arch_event_config_get(void *dom,
-						enum resctrl_event_id eventid);
 #endif /* __LINUX_ARM_MPAM_H */
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 70f87231853d..91f0d0631dc6 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -307,6 +307,8 @@ struct rdt_domain *resctrl_arch_find_domain(struct rdt_resource *r, int id);
 int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid);
 
 bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt);
+void resctrl_arch_mon_event_config_write(void *info);
+void resctrl_arch_mon_event_config_read(void *info);
 
 /* For use by arch code to remap resctrl's smaller CDP CLOSID range */
 static inline u32 resctrl_get_config_index(u32 closid,
diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h
index 7c6dad3df4ff..5c1e1dbd1ad8 100644
--- a/include/linux/resctrl_types.h
+++ b/include/linux/resctrl_types.h
@@ -40,6 +40,27 @@
 #define RFTYPE_CTRL_BASE		(RFTYPE_BASE | RFTYPE_CTRL)
 #define RFTYPE_MON_BASE			(RFTYPE_BASE | RFTYPE_MON)
 
+/* Reads to Local DRAM Memory */
+#define READS_TO_LOCAL_MEM		BIT(0)
+
+/* Reads to Remote DRAM Memory */
+#define READS_TO_REMOTE_MEM		BIT(1)
+
+/* Non-Temporal Writes to Local Memory */
+#define NON_TEMP_WRITE_TO_LOCAL_MEM	BIT(2)
+
+/* Non-Temporal Writes to Remote Memory */
+#define NON_TEMP_WRITE_TO_REMOTE_MEM	BIT(3)
+
+/* Reads to Local Memory the system identifies as "Slow Memory" */
+#define READS_TO_LOCAL_S_MEM		BIT(4)
+
+/* Reads to Remote Memory the system identifies as "Slow Memory" */
+#define READS_TO_REMOTE_S_MEM		BIT(5)
+
+/* Dirty Victims to All Types of Memory */
+#define DIRTY_VICTIMS_TO_ALL_MEM	BIT(6)
+
 /* Max event bits supported */
 #define MAX_EVT_CONFIG_BITS		GENMASK(6, 0)
 
-- 
Gitee


From eb9e09de986b96a41f5343cea2c70b417722d046 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:35:35 -0800
Subject: [PATCH 023/280] anolis: Revert "x86/resctrl: Introduce mbm_total_cfg
 and mbm_local_cfg"

ANBZ: #31045

This reverts commit 26bec061fb1fc7a32f2d6ac6d051bad506d16a9d.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     |  2 --
 arch/x86/kernel/cpu/resctrl/internal.h |  6 +-----
 arch/x86/kernel/cpu/resctrl/monitor.c  | 26 --------------------------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 24 ++++++++++++++++++++++++
 fs/resctrl/internal.h                  |  1 -
 include/linux/resctrl.h                | 22 ----------------------
 include/linux/resctrl_types.h          |  3 ---
 7 files changed, 25 insertions(+), 59 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 7a70a55a5162..8c16e1153db6 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -530,8 +530,6 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 		return;
 	}
 
-	resctrl_mbm_evt_config_init(hw_dom);
-
 	if (r->mon_capable && arch_domain_mbm_alloc(r->mon.num_rmid, hw_dom)) {
 		domain_free(hw_dom);
 		return;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 993dfb942f9c..3ef379c44e92 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -59,8 +59,6 @@ struct arch_mbm_state {
  * @ctrl_val:	array of cache or mem ctrl values (indexed by CLOSID)
  * @arch_mbm_total:	arch private state for MBM total bandwidth
  * @arch_mbm_local:	arch private state for MBM local bandwidth
- * @mbm_total_cfg:	MBM total bandwidth configuration
- * @mbm_local_cfg:	MBM local bandwidth configuration
  *
  * Members of this structure are accessed via helpers that provide abstraction.
  */
@@ -69,8 +67,6 @@ struct rdt_hw_domain {
 	u32				*ctrl_val;
 	struct arch_mbm_state		*arch_mbm_total;
 	struct arch_mbm_state		*arch_mbm_local;
-	u32				mbm_total_cfg;
-	u32				mbm_local_cfg;
 };
 
 static inline struct rdt_hw_domain *resctrl_to_arch_dom(struct rdt_domain *r)
@@ -195,5 +191,5 @@ int rdt_get_mon_l3_config(struct rdt_resource *r);
 bool rdt_cpu_has(int flag);
 void __init intel_rdt_mbm_apply_quirk(void);
 void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
-void resctrl_mbm_evt_config_init(struct rdt_hw_domain *hw_dom);
+
 #endif /* _ASM_X86_RESCTRL_INTERNAL_H */
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index ee8519f51359..f3dbb2543c37 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -279,32 +279,6 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 	return 0;
 }
 
-void resctrl_mbm_evt_config_init(struct rdt_hw_domain *hw_dom)
-{
-	unsigned int index;
-	u64 msrval;
-
-	/*
-	 * Read the configuration registers QOS_EVT_CFG_n, where <n> is
-	 * the BMEC event number (EvtID).
-	 */
-	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_TOTAL_EVENT_ID)) {
-		index = mon_event_config_index_get(QOS_L3_MBM_TOTAL_EVENT_ID);
-		rdmsrl(MSR_IA32_EVT_CFG_BASE + index, msrval);
-		hw_dom->mbm_total_cfg = msrval & MAX_EVT_CONFIG_BITS;
-	} else {
-		hw_dom->mbm_total_cfg = INVALID_CONFIG_VALUE;
-	}
-
-	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_LOCAL_EVENT_ID)) {
-		index = mon_event_config_index_get(QOS_L3_MBM_LOCAL_EVENT_ID);
-		rdmsrl(MSR_IA32_EVT_CFG_BASE + index, msrval);
-		hw_dom->mbm_local_cfg = msrval & MAX_EVT_CONFIG_BITS;
-	} else {
-		hw_dom->mbm_total_cfg = INVALID_CONFIG_VALUE;
-	}
-}
-
 void __init intel_rdt_mbm_apply_quirk(void)
 {
 	int cf_index;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index a0b27a82099c..4aba9b972a14 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -45,6 +45,30 @@ void resctrl_arch_sync_cpu_defaults(void *info)
 	resctrl_arch_sched_in(current);
 }
 
+#define INVALID_CONFIG_INDEX   UINT_MAX
+
+/**
+ * mon_event_config_index_get - get the hardware index for the
+ *                              configurable event
+ * @evtid: event id.
+ *
+ * Return: 0 for evtid == QOS_L3_MBM_TOTAL_EVENT_ID
+ *         1 for evtid == QOS_L3_MBM_LOCAL_EVENT_ID
+ *         INVALID_CONFIG_INDEX for invalid evtid
+ */
+static inline unsigned int mon_event_config_index_get(u32 evtid)
+{
+	switch (evtid) {
+	case QOS_L3_MBM_TOTAL_EVENT_ID:
+		return 0;
+	case QOS_L3_MBM_LOCAL_EVENT_ID:
+		return 1;
+	default:
+		/* Should never reach here */
+		return INVALID_CONFIG_INDEX;
+	}
+}
+
 void resctrl_arch_mon_event_config_read(void *info)
 {
 	struct resctrl_mon_config_info *mon_info = info;
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index 7620f8a5ce50..04f79dfacd62 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -307,7 +307,6 @@ void mbm_cntr_free(u32 cntr_id);
 void rdt_staged_configs_clear(void);
 bool closid_allocated(unsigned int closid);
 int resctrl_find_cleanest_closid(void);
-unsigned int mon_event_config_index_get(u32 evtid);
 
 #ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
 int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 91f0d0631dc6..c9703ef8cb7f 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -272,28 +272,6 @@ struct resctrl_mon_config_info {
 	int                  err;
 };
 
-/**
- * mon_event_config_index_get - get the hardware index for the
- *                              configurable event
- * @evtid: event id.
- *
- * Return: 0 for evtid == QOS_L3_MBM_TOTAL_EVENT_ID
- *         1 for evtid == QOS_L3_MBM_LOCAL_EVENT_ID
- *         INVALID_CONFIG_INDEX for invalid evtid
- */
-static inline unsigned int mon_event_config_index_get(u32 evtid)
-{
-	switch (evtid) {
-	case QOS_L3_MBM_TOTAL_EVENT_ID:
-		return 0;
-	case QOS_L3_MBM_LOCAL_EVENT_ID:
-		return 1;
-	default:
-		/* Should never reach here */
-		return INVALID_CONFIG_INDEX;
-	}
-}
-
 /*
  * Update and re-load this CPUs defaults. Called via IPI, takes a pointer to
  * struct resctrl_cpu_sync, or NULL.
diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h
index 5c1e1dbd1ad8..a0d8694be783 100644
--- a/include/linux/resctrl_types.h
+++ b/include/linux/resctrl_types.h
@@ -7,9 +7,6 @@
 #ifndef __LINUX_RESCTRL_TYPES_H
 #define __LINUX_RESCTRL_TYPES_H
 
-#define INVALID_CONFIG_VALUE	U32_MAX
-#define INVALID_CONFIG_INDEX	UINT_MAX
-
 #define CQM_LIMBOCHECK_INTERVAL	1000
 
 #define MBM_CNTR_WIDTH_BASE		24
-- 
Gitee


From dca96500dd64266eb2c2d4d5eae124a590936f7f Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:35:43 -0800
Subject: [PATCH 024/280] anolis: Revert "x86/resctrl: Introduce MBM counters
 bitmap"

ANBZ: #31045

This reverts commit 20ad3c34e09f432b16aed92881433bbe99608395.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/internal.h |  2 --
 fs/resctrl/rdtgroup.c | 33 ---------------------------------
 2 files changed, 35 deletions(-)

diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index 04f79dfacd62..d86b0295c456 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -302,8 +302,6 @@ void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms,
 void cqm_handle_limbo(struct work_struct *work);
 bool has_busy_rmid(struct rdt_domain *d);
 void __check_limbo(struct rdt_domain *d, bool force_free);
-int mbm_cntr_alloc(struct rdt_resource *r);
-void mbm_cntr_free(u32 cntr_id);
 void rdt_staged_configs_clear(void);
 bool closid_allocated(unsigned int closid);
 int resctrl_find_cleanest_closid(void);
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 9a2f1734dee5..6ed6f774ec8a 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -207,37 +207,6 @@ bool closid_allocated(unsigned int closid)
 	return !test_bit(closid, closid_free_map);
 }
 
-/*
- * Counter bitmap for tracking the available counters.
- * ABMC feature provides set of hardware counters for enabling events.
- * Each event takes one hardware counter. Kernel needs to keep track
- * of number of available counters.
- */
-static DECLARE_BITMAP(mbm_cntrs_free_map, 64);
-
-static void mbm_cntrs_init(struct rdt_resource *r)
-{
-	bitmap_fill(mbm_cntrs_free_map, r->mon.num_mbm_cntrs);
-}
-
-int mbm_cntr_alloc(struct rdt_resource *r)
-{
-	int cntr_id;
-
-	cntr_id = find_first_bit(mbm_cntrs_free_map, r->mon.num_mbm_cntrs);
-	if (cntr_id >= r->mon.num_mbm_cntrs)
-		return -ENOSPC;
-
-	__clear_bit(cntr_id, mbm_cntrs_free_map);
-
-	return cntr_id;
-}
-
-void mbm_cntr_free(u32 cntr_id)
-{
-	__set_bit(cntr_id, mbm_cntrs_free_map);
-}
-
 /**
  * rdtgroup_mode_by_closid - Return mode of resource group with closid
  * @closid: closid if the resource group
@@ -2604,8 +2573,6 @@ static int rdt_get_tree(struct fs_context *fc)
 
 	closid_init();
 
-	mbm_cntrs_init(resctrl_arch_get_resource(RDT_RESOURCE_L3));
-
 	if (resctrl_arch_mon_capable())
 		flags |= RFTYPE_MON;
 
-- 
Gitee


From 32b2112fb72293f7459af74c28c73d4df67a6146 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:35:51 -0800
Subject: [PATCH 025/280] anolis: Revert "x86/resctrl: Introduce interface to
 display number of monitoring counters"

ANBZ: #31045

This reverts commit ff4f78ad7a18d74aa690c554443b9bbc182224cb.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/resctrl.rst    |  3 ---
 arch/x86/kernel/cpu/resctrl/monitor.c |  2 --
 fs/resctrl/rdtgroup.c                 | 16 ----------------
 3 files changed, 21 deletions(-)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 4594f740eb67..431f08352c0e 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -291,9 +291,6 @@ with the following files:
 		as long as there are enough RMID counters available to support number
 		of monitoring groups.
 
-"num_mbm_cntrs":
-	The number of monitoring counters available for assignment.
-
 "max_threshold_occupancy":
 		Read/write file provides the largest value (in
 		bytes) at which a previously used LLC_occupancy
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index f3dbb2543c37..974cc7beba82 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -255,8 +255,6 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 		r->mon.num_mbm_cntrs = (ebx & 0xFFFF) + 1;
 		if (WARN_ON(r->mon.num_mbm_cntrs > 64))
 			r->mon.num_mbm_cntrs = 64;
-
-		resctrl_file_fflags_init("num_mbm_cntrs", RFTYPE_MON_INFO);
 	}
 
 	/*
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 6ed6f774ec8a..cc03fe848b8e 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -875,16 +875,6 @@ static int rdtgroup_mbm_mode_show(struct kernfs_open_file *of,
 	return 0;
 }
 
-static int rdtgroup_num_mbm_cntrs_show(struct kernfs_open_file *of,
-				       struct seq_file *s, void *v)
-{
-	struct rdt_resource *r = of->kn->parent->priv;
-
-	seq_printf(s, "%d\n", r->mon.num_mbm_cntrs);
-
-	return 0;
-}
-
 #ifdef CONFIG_PROC_CPU_RESCTRL
 
 /*
@@ -1912,12 +1902,6 @@ static struct rftype res_common_files[] = {
 		.seq_show	= rdtgroup_cpus_show,
 		.fflags		= RFTYPE_BASE,
 	},
-	{
-		.name		= "num_mbm_cntrs",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdtgroup_num_mbm_cntrs_show,
-	},
 	{
 		.name		= "cpus_list",
 		.mode		= 0644,
-- 
Gitee


From 6dd6dc4bfd89488cfd708f4c08aef3b963e105a2 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:35:59 -0800
Subject: [PATCH 026/280] anolis: Revert "x86/resctrl: Introduce the interface
 to display monitor mode"

ANBZ: #31045

This reverts commit e7dd18cfbb5575226f8d7ea2003b7fef5a204564.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/resctrl.rst | 34 ------------------------------
 fs/resctrl/rdtgroup.c              | 27 ------------------------
 2 files changed, 61 deletions(-)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 431f08352c0e..d816ded93c22 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -257,40 +257,6 @@ with the following files:
 	    # cat /sys/fs/resctrl/info/L3_MON/mbm_local_bytes_config
 	    0=0x30;1=0x30;3=0x15;4=0x15
 
-"mbm_mode":
-	Reports the list of assignable monitoring features supported. The
-	enclosed brackets indicate which feature is enabled.
-	::
-
-	  cat /sys/fs/resctrl/info/L3_MON/mbm_mode
-	  [mbm_cntr_assign]
-	  legacy
-
-	"mbm_cntr_assign":
-		AMD's ABMC feature is one of the mbm_cntr_assign mode supported.
-		The bandwidth monitoring feature on AMD system only guarantees
-		that RMIDs currently assigned to a processor will be tracked by
-		hardware. The counters of any other RMIDs which are no longer
-		being tracked will be reset to zero. The MBM event counters
-		return "Unavailable" for the RMIDs that are not tracked by
-		hardware. So, there can be only limited number of groups that can
-		give guaranteed monitoring numbers. With ever changing configurations
-		there is no way to definitely know which of these groups are being
-		tracked for certain point of time. Users do not have the option to
-		monitor a group or set of groups for certain period of time without
-		worrying about RMID being reset in between.
-
-		The ABMC feature provides an option to the user to assign a hardware
-		counter to an RMID and monitor the bandwidth as long as it is assigned.
-		The assigned RMID will be tracked by the hardware until the user
-		unassigns it manually. There is no need to worry about counters being
-		reset during this period.
-
-	"Legacy":
-		Legacy mode works without the assignment option. The monitoring works
-		as long as there are enough RMID counters available to support number
-		of monitoring groups.
-
 "max_threshold_occupancy":
 		Read/write file provides the largest value (in
 		bytes) at which a previously used LLC_occupancy
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index cc03fe848b8e..638b7827b8cb 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -855,26 +855,6 @@ static int rdtgroup_rmid_show(struct kernfs_open_file *of,
 	return ret;
 }
 
-static int rdtgroup_mbm_mode_show(struct kernfs_open_file *of,
-				  struct seq_file *s, void *v)
-{
-	struct rdt_resource *r = of->kn->parent->priv;
-
-	if (r->mon.mbm_cntr_assignable) {
-		if (resctrl_arch_get_abmc_enabled()) {
-			seq_puts(s, "[mbm_cntr_assign]\n");
-			seq_puts(s, "legacy\n");
-		} else {
-			seq_puts(s, "mbm_cntr_assign\n");
-			seq_puts(s, "[legacy]\n");
-		}
-	} else {
-		seq_puts(s, "[legacy]\n");
-	}
-
-	return 0;
-}
-
 #ifdef CONFIG_PROC_CPU_RESCTRL
 
 /*
@@ -1887,13 +1867,6 @@ static struct rftype res_common_files[] = {
 		.seq_show	= mbm_local_bytes_config_show,
 		.write		= mbm_local_bytes_config_write,
 	},
-	{
-		.name		= "mbm_mode",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdtgroup_mbm_mode_show,
-		.fflags		= RFTYPE_MON_INFO,
-	},
 	{
 		.name		= "cpus",
 		.mode		= 0644,
-- 
Gitee


From fac638dcf46072c86631888ff5d52e371dacdede Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:36:06 -0800
Subject: [PATCH 027/280] anolis: Revert "x86/resctrl: Add support to
 enable/disable AMD ABMC feature"

ANBZ: #31045

This reverts commit 2dd7907598ed3a655276eb27f7b5503f3cb03c57.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/msr-index.h       |  1 -
 arch/x86/include/asm/resctrl.h         |  5 ---
 arch/x86/kernel/cpu/resctrl/internal.h |  5 ---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 62 --------------------------
 include/linux/arm_mpam.h               | 12 -----
 include/linux/resctrl.h                |  2 -
 6 files changed, 87 deletions(-)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 5bcafbf648a7..47edd53ae5b8 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -1194,7 +1194,6 @@
 #define MSR_IA32_MBA_BW_BASE		0xc0000200
 #define MSR_IA32_SMBA_BW_BASE		0xc0000280
 #define MSR_IA32_EVT_CFG_BASE		0xc0000400
-#define MSR_IA32_L3_QOS_EXT_CFG		0xc00003ff
 
 /* MSR_IA32_VMX_MISC bits */
 #define MSR_IA32_VMX_MISC_INTEL_PT                 (1ULL << 14)
diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index dec669838b39..04be7e43f015 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -216,9 +216,6 @@ static inline void *resctrl_arch_mon_ctx_alloc(struct rdt_resource *r, int evtid
 static inline void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid,
 					     void *ctx) { };
 
-int resctrl_arch_mbm_cntr_assign_enable(void);
-void resctrl_arch_mbm_cntr_assign_disable(void);
-
 u64 resctrl_arch_get_prefetch_disable_bits(void);
 int resctrl_arch_pseudo_lock_fn(void *_plr);
 int resctrl_arch_measure_cycles_lat_fn(void *_plr);
@@ -232,8 +229,6 @@ int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
 bool resctrl_arch_is_hwdrc_mb_capable(void);
 int resctrl_arch_set_hwdrc_enabled(enum resctrl_res_level l, bool hwdrc_mb);
 
-bool resctrl_arch_get_abmc_enabled(void);
-
 #else
 
 static inline void resctrl_arch_sched_in(struct task_struct *tsk) {}
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 3ef379c44e92..270953d9db4d 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -37,9 +37,6 @@
  */
 #define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)
 
-/* Setting bit 0 in L3_QOS_EXT_CFG enables the ABMC feature. */
-#define ABMC_ENABLE_BIT			0
-
 /**
  * struct arch_mbm_state - values used to compute resctrl_arch_rmid_read()s
  *			   return value.
@@ -99,7 +96,6 @@ struct msr_param {
  * @mon_scale:		cqm counter * mon_scale = occupancy in bytes
  * @mbm_width:		Monitor width, to detect and correct for overflow.
  * @cdp_enabled:	CDP state of this resource
- * @mbm_cntr_assign_enabled:	ABMC feature is enabled
  *
  * Members of this structure are either private to the architecture
  * e.g. mbm_width, or accessed via helpers that provide abstraction. e.g.
@@ -114,7 +110,6 @@ struct rdt_hw_resource {
 	unsigned int		mon_scale;
 	unsigned int		mbm_width;
 	bool			cdp_enabled;
-	bool			mbm_cntr_assign_enabled;
 };
 
 static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 4aba9b972a14..405f70c770d1 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -336,68 +336,6 @@ int resctrl_arch_set_hwdrc_enabled(enum resctrl_res_level l, bool hwdrc_mb)
 	return 0;
 }
 
-/*
- * Update L3_QOS_EXT_CFG MSR on all the CPUs associated with the resource.
- */
-static void resctrl_abmc_set_one_amd(void *arg)
-{
-	bool *enable = arg;
-
-	if (*enable)
-		msr_set_bit(MSR_IA32_L3_QOS_EXT_CFG, ABMC_ENABLE_BIT);
-	else
-		msr_clear_bit(MSR_IA32_L3_QOS_EXT_CFG, ABMC_ENABLE_BIT);
-}
-
-static void _resctrl_abmc_enable(struct rdt_resource *r, bool enable)
-{
-	struct rdt_domain *d;
-
-	/*
-	 * Hardware counters will reset after switching the monitor mode.
-	 * Reset the architectural state so that reading of hardware
-	 * counter is not considered as an overflow in the next update.
-	 */
-	list_for_each_entry(d, &r->domains, list) {
-		on_each_cpu_mask(&d->cpu_mask,
-				 resctrl_abmc_set_one_amd, &enable, 1);
-		resctrl_arch_reset_rmid_all(r, d);
-	}
-}
-
-bool resctrl_arch_get_abmc_enabled(void)
-{
-	return rdt_resources_all[RDT_RESOURCE_L3].mbm_cntr_assign_enabled;
-}
-
-int resctrl_arch_mbm_cntr_assign_enable(void)
-{
-	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	if (r->mon.mbm_cntr_assignable && !hw_res->mbm_cntr_assign_enabled) {
-		_resctrl_abmc_enable(r, true);
-		hw_res->mbm_cntr_assign_enabled = true;
-	}
-
-	return 0;
-}
-
-void resctrl_arch_mbm_cntr_assign_disable(void)
-{
-	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	if (hw_res->mbm_cntr_assign_enabled) {
-		_resctrl_abmc_enable(r, false);
-		hw_res->mbm_cntr_assign_enabled = false;
-	}
-}
-
 static int reset_all_ctrls(struct rdt_resource *r)
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index 398ae2afa5dd..b3be84f24c72 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -128,16 +128,4 @@ static inline void resctrl_arch_disable_mon(void) { }
 static inline void resctrl_arch_enable_alloc(void) { }
 static inline void resctrl_arch_disable_alloc(void) { }
 
-static inline bool resctrl_arch_get_abmc_enabled(void)
-{
-	return false;
-}
-
-static inline int resctrl_arch_mbm_cntr_assign_enable(void)
-{
-	return -EINVAL;
-}
-
-static inline void resctrl_arch_mbm_cntr_assign_disable(void) { }
-
 #endif /* __LINUX_ARM_MPAM_H */
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index c9703ef8cb7f..1a1aab4069c1 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -12,8 +12,6 @@
 #include <asm/resctrl.h>
 #endif
 
-extern struct mutex rdtgroup_mutex;
-
 /* CLOSID, RMID value used by the default control group */
 #define RESCTRL_RESERVED_CLOSID		0
 #define RESCTRL_RESERVED_RMID		0
-- 
Gitee


From 3846b6699d3ebeab2c1e300f513d125a92857305 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:36:11 -0800
Subject: [PATCH 028/280] anolis: Revert "x86/resctrl: Introduce
 resctrl_file_fflags_init() to initialize fflags"

ANBZ: #31045

This reverts commit 3e75a0ebc07bfef1069771da6e483efd85a28537.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/internal.h   |  1 +
 fs/resctrl/monitor.c    |  6 ++----
 fs/resctrl/rdtgroup.c   | 23 +++++++++++++++++++----
 include/linux/resctrl.h |  1 -
 4 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index d86b0295c456..d56e3200d1d7 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -302,6 +302,7 @@ void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms,
 void cqm_handle_limbo(struct work_struct *work);
 bool has_busy_rmid(struct rdt_domain *d);
 void __check_limbo(struct rdt_domain *d, bool force_free);
+void mbm_config_rftype_init(const char *config);
 void rdt_staged_configs_clear(void);
 bool closid_allocated(unsigned int closid);
 int resctrl_find_cleanest_closid(void);
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index b6bb310bb10b..1ca50dfee517 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -852,13 +852,11 @@ int resctrl_mon_resource_init(void)
 
 	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_TOTAL_EVENT_ID)) {
 		mbm_total_event.configurable = true;
-		resctrl_file_fflags_init("mbm_total_bytes_config",
-					 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
+		mbm_config_rftype_init("mbm_total_bytes_config");
 	}
 	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_LOCAL_EVENT_ID)) {
 		mbm_local_event.configurable = true;
-		resctrl_file_fflags_init("mbm_local_bytes_config",
-					 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
+		mbm_config_rftype_init("mbm_local_bytes_config");
 	}
 
 	r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 638b7827b8cb..efdab19640c2 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -1986,13 +1986,29 @@ static struct rftype *rdtgroup_get_rftype_by_name(const char *name)
 	return NULL;
 }
 
-void resctrl_file_fflags_init(const char *config, unsigned long fflags)
+static void thread_throttle_mode_init(void)
+{
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+	struct rftype *rft;
+
+	if (!r->alloc_capable ||
+	    r->membw.throttle_mode == THREAD_THROTTLE_UNDEFINED)
+		return;
+
+	rft = rdtgroup_get_rftype_by_name("thread_throttle_mode");
+	if (!rft)
+		return;
+
+	rft->fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_MB;
+}
+
+void mbm_config_rftype_init(const char *config)
 {
 	struct rftype *rft;
 
 	rft = rdtgroup_get_rftype_by_name(config);
 	if (rft)
-		rft->fflags = fflags;
+		rft->fflags = RFTYPE_MON_INFO | RFTYPE_RES_CACHE;
 }
 
 /**
@@ -3984,8 +4000,7 @@ int resctrl_init(void)
 
 	rdtgroup_setup_default();
 
-	resctrl_file_fflags_init("thread_throttle_mode",
-				 RFTYPE_CTRL_INFO | RFTYPE_RES_MB);
+	thread_throttle_mode_init();
 
 	ret = resctrl_mon_resource_init();
 	if (ret)
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 1a1aab4069c1..b5e479914fa4 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -408,7 +408,6 @@ void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_domain *d);
 
 extern unsigned int resctrl_rmid_realloc_threshold;
 extern unsigned int resctrl_rmid_realloc_limit;
-void resctrl_file_fflags_init(const char *config, unsigned long fflags);
 
 int resctrl_init(void);
 void resctrl_exit(void);
-- 
Gitee


From 38e9e5ad3daacec0fa20a6379924743b014362ba Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:36:17 -0800
Subject: [PATCH 029/280] anolis: Revert "x86/resctrl: Detect Assignable
 Bandwidth Monitoring feature details"

ANBZ: #31045

This reverts commit e7434733c38e2f4afbcd3e43c4633b630d25cb61.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/monitor.c | 13 -------------
 include/linux/resctrl.h               |  4 ----
 2 files changed, 17 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 974cc7beba82..d5304a12500d 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -224,7 +224,6 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 	unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	unsigned int threshold;
-	u32 eax, ebx, ecx, edx;
 
 	resctrl_rmid_realloc_limit = boot_cpu_data.x86_cache_size * 1024;
 	hw_res->mon_scale = boot_cpu_data.x86_cache_occ_scale;
@@ -245,18 +244,6 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 	 */
 	threshold = resctrl_rmid_realloc_limit / r->mon.num_rmid;
 
-	if (rdt_cpu_has(X86_FEATURE_ABMC)) {
-		r->mon.mbm_cntr_assignable = true;
-		/*
-		 * Query CPUID_Fn80000020_EBX_x05 for number of
-		 * ABMC counters.
-		 */
-		cpuid_count(0x80000020, 5, &eax, &ebx, &ecx, &edx);
-		r->mon.num_mbm_cntrs = (ebx & 0xFFFF) + 1;
-		if (WARN_ON(r->mon.num_mbm_cntrs > 64))
-			r->mon.num_mbm_cntrs = 64;
-	}
-
 	/*
 	 * Because num_rmid may not be a power of two, round the value
 	 * to the nearest multiple of hw_res->mon_scale so it matches a
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index b5e479914fa4..034546e97602 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -182,14 +182,10 @@ struct resctrl_membw {
 /**
  * struct resctrl_mon - Monitoring related data
  * @num_rmid:		Number of RMIDs available
- * @num_mbm_cntrs:	Number of monitoring counters
- * @mbm_cntr_assignable:Is system capable of supporting monitor assignment?
  * @evt_list:		List of monitoring events
  */
 struct resctrl_mon {
 	int			num_rmid;
-	int			num_mbm_cntrs;
-	bool			mbm_cntr_assignable;
 	struct list_head	evt_list;
 };
 
-- 
Gitee


From ae16e7d863f4e0308f639af3437b2cf41ffd6fad Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:36:24 -0800
Subject: [PATCH 030/280] anolis: Revert "x86/resctrl: Consolidate monitoring
 related data from rdt_resource"

ANBZ: #31045

This reverts commit 1cb013cbe5e221764d3454ff1e23c72798e09f13.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c    |  2 +-
 arch/x86/kernel/cpu/resctrl/monitor.c |  8 ++++----
 drivers/platform/mpam/mpam_resctrl.c  |  4 ++--
 fs/resctrl/internal.h                 |  2 +-
 fs/resctrl/monitor.c                  | 12 ++++++------
 fs/resctrl/rdtgroup.c                 |  8 ++++----
 include/linux/resctrl.h               | 15 ++++-----------
 7 files changed, 22 insertions(+), 29 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 8c16e1153db6..7b2b5ca496f8 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -530,7 +530,7 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 		return;
 	}
 
-	if (r->mon_capable && arch_domain_mbm_alloc(r->mon.num_rmid, hw_dom)) {
+	if (r->mon_capable && arch_domain_mbm_alloc(r->num_rmid, hw_dom)) {
 		domain_free(hw_dom);
 		return;
 	}
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index d5304a12500d..e0cc1b499279 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -170,11 +170,11 @@ void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_domain *d)
 
 	if (resctrl_arch_is_mbm_total_enabled())
 		memset(hw_dom->arch_mbm_total, 0,
-		       sizeof(*hw_dom->arch_mbm_total) * r->mon.num_rmid);
+		       sizeof(*hw_dom->arch_mbm_total) * r->num_rmid);
 
 	if (resctrl_arch_is_mbm_local_enabled())
 		memset(hw_dom->arch_mbm_local, 0,
-		       sizeof(*hw_dom->arch_mbm_local) * r->mon.num_rmid);
+		       sizeof(*hw_dom->arch_mbm_local) * r->num_rmid);
 }
 
 static u64 mbm_overflow_count(u64 prev_msr, u64 cur_msr, unsigned int width)
@@ -227,7 +227,7 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 
 	resctrl_rmid_realloc_limit = boot_cpu_data.x86_cache_size * 1024;
 	hw_res->mon_scale = boot_cpu_data.x86_cache_occ_scale;
-	r->mon.num_rmid = boot_cpu_data.x86_cache_max_rmid + 1;
+	r->num_rmid = boot_cpu_data.x86_cache_max_rmid + 1;
 	hw_res->mbm_width = MBM_CNTR_WIDTH_BASE;
 
 	if (mbm_offset > 0 && mbm_offset <= MBM_CNTR_WIDTH_OFFSET_MAX)
@@ -242,7 +242,7 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 	 *
 	 * For a 35MB LLC and 56 RMIDs, this is ~1.8% of the LLC.
 	 */
-	threshold = resctrl_rmid_realloc_limit / r->mon.num_rmid;
+	threshold = resctrl_rmid_realloc_limit / r->num_rmid;
 
 	/*
 	 * Because num_rmid may not be a power of two, round the value
diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 242dcf69066e..55848a9c321c 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -875,7 +875,7 @@ static int mpam_resctrl_resource_init(struct mpam_resctrl_res *res)
 		 * For mpam, each control group has its own pmg/rmid
 		 * space.
 		 */
-		r->mon.num_rmid = 1;
+		r->num_rmid = 1;
 	}
 
 	return 0;
@@ -893,7 +893,7 @@ int mpam_resctrl_setup(void)
 	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
 		res = &mpam_resctrl_exports[i];
 		INIT_LIST_HEAD(&res->resctrl_res.domains);
-		INIT_LIST_HEAD(&res->resctrl_res.mon.evt_list);
+		INIT_LIST_HEAD(&res->resctrl_res.evt_list);
 		res->resctrl_res.rid = i;
 	}
 
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index d56e3200d1d7..6b378466d8a4 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -73,7 +73,7 @@ static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
  * @evtid:		event id
  * @name:		name of the event
  * @configurable:	true if the event is configurable
- * @list:		entry in &rdt_resource->mon.evt_list
+ * @list:		entry in &rdt_resource->evt_list
  */
 struct mon_evt {
 	enum resctrl_event_id	evtid;
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index 1ca50dfee517..62ae06aac20d 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -818,22 +818,22 @@ static struct mon_evt mbm_bps_event = {
  */
 static void l3_mon_evt_init(struct rdt_resource *r)
 {
-	INIT_LIST_HEAD(&r->mon.evt_list);
+	INIT_LIST_HEAD(&r->evt_list);
 
 	if (resctrl_arch_is_llc_occupancy_enabled())
-		list_add_tail(&llc_occupancy_event.list, &r->mon.evt_list);
+		list_add_tail(&llc_occupancy_event.list, &r->evt_list);
 	if (resctrl_arch_is_mbm_total_enabled())
-		list_add_tail(&mbm_total_event.list, &r->mon.evt_list);
+		list_add_tail(&mbm_total_event.list, &r->evt_list);
 	if (resctrl_arch_is_mbm_local_enabled())
-		list_add_tail(&mbm_local_event.list, &r->mon.evt_list);
+		list_add_tail(&mbm_local_event.list, &r->evt_list);
 }
 
 static void mc_mon_evt_init(struct rdt_resource *r)
 {
-	INIT_LIST_HEAD(&r->mon.evt_list);
+	INIT_LIST_HEAD(&r->evt_list);
 
 	if (resctrl_arch_is_mbm_bps_enabled())
-		list_add_tail(&mbm_bps_event.list, &r->mon.evt_list);
+		list_add_tail(&mbm_bps_event.list, &r->evt_list);
 }
 
 int resctrl_mon_resource_init(void)
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index efdab19640c2..e2a8de53d639 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -1107,7 +1107,7 @@ static int rdt_num_rmids_show(struct kernfs_open_file *of,
 {
 	struct rdt_resource *r = of->kn->parent->priv;
 
-	seq_printf(seq, "%d\n", r->mon.num_rmid);
+	seq_printf(seq, "%d\n", r->num_rmid);
 
 	return 0;
 }
@@ -1118,7 +1118,7 @@ static int rdt_mon_features_show(struct kernfs_open_file *of,
 	struct rdt_resource *r = of->kn->parent->priv;
 	struct mon_evt *mevt;
 
-	list_for_each_entry(mevt, &r->mon.evt_list, list) {
+	list_for_each_entry(mevt, &r->evt_list, list) {
 		seq_printf(seq, "%s\n", mevt->name);
 		if (mevt->configurable)
 			seq_printf(seq, "%s_config\n", mevt->name);
@@ -2921,14 +2921,14 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
 	if (ret)
 		goto out_destroy;
 
-	if (WARN_ON(list_empty(&r->mon.evt_list))) {
+	if (WARN_ON(list_empty(&r->evt_list))) {
 		ret = -EPERM;
 		goto out_destroy;
 	}
 
 	priv.u.rid = r->rid;
 	priv.u.domid = d->id;
-	list_for_each_entry(mevt, &r->mon.evt_list, list) {
+	list_for_each_entry(mevt, &r->evt_list, list) {
 		priv.u.evtid = mevt->evtid;
 		ret = mon_addfile(kn, mevt->name, priv.priv);
 		if (ret)
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 034546e97602..5d06695671e2 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -179,21 +179,12 @@ struct resctrl_membw {
 	u32				*mb_map;
 };
 
-/**
- * struct resctrl_mon - Monitoring related data
- * @num_rmid:		Number of RMIDs available
- * @evt_list:		List of monitoring events
- */
-struct resctrl_mon {
-	int			num_rmid;
-	struct list_head	evt_list;
-};
-
 /**
  * struct rdt_resource - attributes of a resctrl resource
  * @rid:		The index of the resource
  * @alloc_capable:	Is allocation available on this machine
  * @mon_capable:	Is monitor feature available on this machine
+ * @num_rmid:		Number of RMIDs available
  * @cache_level:	Which cache level defines scope of this resource
  * @cache:		Cache allocation related data
  * @membw:		If the component has bandwidth controls, their properties.
@@ -202,6 +193,7 @@ struct resctrl_mon {
  * @data_width:		Character width of data when displaying
  * @default_ctrl:	Specifies default cache cbm or memory B/W percent.
  * @format_str:		Per resource format string to show domain value
+ * @evt_list:		List of monitoring events
  * @fflags:		flags to choose base and info files
  * @mbm_cfg_mask:	Bandwidth sources that can be tracked when Bandwidth
  *			Monitoring Event Configuration (BMEC) is supported.
@@ -211,15 +203,16 @@ struct rdt_resource {
 	int			rid;
 	bool			alloc_capable;
 	bool			mon_capable;
+	int			num_rmid;
 	int			cache_level;
 	struct resctrl_cache	cache;
 	struct resctrl_membw	membw;
-	struct resctrl_mon mon;
 	struct list_head	domains;
 	char			*name;
 	int			data_width;
 	u32			default_ctrl;
 	const char		*format_str;
+	struct list_head	evt_list;
 	unsigned long		fflags;
 	unsigned int		mbm_cfg_mask;
 	bool			cdp_capable;
-- 
Gitee


From 46ee021daf11fc535e016ecde2b81982ce3ecec3 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:36:30 -0800
Subject: [PATCH 031/280] anolis: Revert "x86/resctrl: Add ABMC feature in the
 command line options"

ANBZ: #31045

This reverts commit f326bced03a1be6bd5a9db48eb5cebe486038eca.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/admin-guide/kernel-parameters.txt | 2 +-
 Documentation/arch/x86/resctrl.rst              | 1 -
 arch/x86/kernel/cpu/resctrl/core.c              | 2 --
 3 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index ae26c0b0f4fc..99d2596e0174 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5538,7 +5538,7 @@
 	rdt=		[HW,X86,RDT]
 			Turn on/off individual RDT features. List is:
 			cmt, mbmtotal, mbmlocal, l3cat, l3cdp, l2cat, l2cdp,
-			mba, smba, bmec, abmc.
+			mba, smba, bmec.
 			E.g. to turn on cmt and turn off mba use:
 				rdt=cmt,!mba
 
diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index d816ded93c22..a6279df64a9d 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -26,7 +26,6 @@ MBM (Memory Bandwidth Monitoring)		"cqm_mbm_total", "cqm_mbm_local"
 MBA (Memory Bandwidth Allocation)		"mba"
 SMBA (Slow Memory Bandwidth Allocation)         ""
 BMEC (Bandwidth Monitoring Event Configuration) ""
-ABMC (Assignable Bandwidth Monitoring Counters) ""
 ===============================================	================================
 
 Historically, new features were made visible by default in /proc/cpuinfo. This
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 7b2b5ca496f8..49bea5e5c196 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -634,7 +634,6 @@ enum {
 	RDT_FLAG_MBA,
 	RDT_FLAG_SMBA,
 	RDT_FLAG_BMEC,
-	RDT_FLAG_ABMC,
 };
 
 #define RDT_OPT(idx, n, f)	\
@@ -660,7 +659,6 @@ static struct rdt_options rdt_options[]  __ro_after_init = {
 	RDT_OPT(RDT_FLAG_MBA,	    "mba",	X86_FEATURE_MBA),
 	RDT_OPT(RDT_FLAG_SMBA,	    "smba",	X86_FEATURE_SMBA),
 	RDT_OPT(RDT_FLAG_BMEC,	    "bmec",	X86_FEATURE_BMEC),
-	RDT_OPT(RDT_FLAG_ABMC,	    "abmc",	X86_FEATURE_ABMC),
 };
 #define NUM_RDT_OPTIONS ARRAY_SIZE(rdt_options)
 
-- 
Gitee


From 1b1cebc26222db09228b367959439502488074e4 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 21:45:07 -0800
Subject: [PATCH 032/280] anolis: Revert "x86/cpufeatures: Add support for
 Assignable Bandwidth Monitoring Counters (ABMC)"

This reverts commit 126cd8f9f3cf01a9c72599cd2c0f84b174e7f313.

ANBZ: #31045

Conflicts:
	arch/x86/include/asm/cpufeatures.h
	arch/x86/kernel/cpu/scattered.c
[jz: resolve context conflict]
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/cpufeatures.h | 1 -
 arch/x86/kernel/cpu/cpuid-deps.c   | 3 ---
 arch/x86/kernel/cpu/scattered.c    | 1 -
 3 files changed, 5 deletions(-)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 9a12e209939b..fdac919c8cc5 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -511,7 +511,6 @@
 #define X86_FEATURE_TSA_SQ_NO          (21*32+11) /* "" AMD CPU not vulnerable to TSA-SQ */
 #define X86_FEATURE_TSA_L1_NO          (21*32+12) /* "" AMD CPU not vulnerable to TSA-L1 */
 #define X86_FEATURE_CLEAR_CPU_BUF_VM   (21*32+13) /* "" Clear CPU buffers using VERW before VMRUN */
-#define X86_FEATURE_ABMC		(21*32+ 6) /* "" Assignable Bandwidth Monitoring Counters */
 #define X86_FEATURE_AMD_FAST_CPPC	(21*32 + 5) /* Fast CPPC */
 #define X86_FEATURE_AMD_WORKLOAD_CLASS	(21*32 + 7) /* Workload Classification */
 
diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c
index d0714eb74eca..7d8733874218 100644
--- a/arch/x86/kernel/cpu/cpuid-deps.c
+++ b/arch/x86/kernel/cpu/cpuid-deps.c
@@ -70,9 +70,6 @@ static const struct cpuid_dep cpuid_deps[] = {
 	{ X86_FEATURE_CQM_MBM_LOCAL,		X86_FEATURE_CQM_LLC   },
 	{ X86_FEATURE_BMEC,			X86_FEATURE_CQM_MBM_TOTAL   },
 	{ X86_FEATURE_BMEC,			X86_FEATURE_CQM_MBM_LOCAL   },
-	{ X86_FEATURE_ABMC,			X86_FEATURE_CQM_MBM_TOTAL   },
-	{ X86_FEATURE_ABMC,			X86_FEATURE_CQM_MBM_LOCAL   },
-	{ X86_FEATURE_ABMC,			X86_FEATURE_BMEC      },
 	{ X86_FEATURE_AVX512_BF16,		X86_FEATURE_AVX512VL  },
 	{ X86_FEATURE_AVX512_FP16,		X86_FEATURE_AVX512BW  },
 	{ X86_FEATURE_ENQCMD,			X86_FEATURE_XSAVES    },
diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c
index 509026d5c9cf..e1d8419f6e08 100644
--- a/arch/x86/kernel/cpu/scattered.c
+++ b/arch/x86/kernel/cpu/scattered.c
@@ -52,7 +52,6 @@ static const struct cpuid_bit cpuid_bits[] = {
 	{ X86_FEATURE_BMEC,		CPUID_EBX,  3, 0x80000020, 0 },
 	{ X86_FEATURE_TSA_SQ_NO,	CPUID_ECX,  1, 0x80000021, 0 },
 	{ X86_FEATURE_TSA_L1_NO,	CPUID_ECX,  2, 0x80000021, 0 },
-	{ X86_FEATURE_ABMC,		CPUID_EBX,  5, 0x80000020, 0 },
 	{ X86_FEATURE_AMD_WORKLOAD_CLASS,	CPUID_EAX,  22, 0x80000021, 0 },
 	{ X86_FEATURE_PERFMON_V2,	CPUID_EAX,  0, 0x80000022, 0 },
 	{ X86_FEATURE_AMD_LBR_V2,	CPUID_EAX,  1, 0x80000022, 0 },
-- 
Gitee


From b7b778a3bc6d14bdb66ebcc3c479b5df71242031 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 22:54:20 -0800
Subject: [PATCH 033/280] anolis: Revert "anolis: x86/resctrl: Add mount option
 for memory bandwidth HWDRC"

ANBZ: #31045

This reverts commit fcab6177eed5c4db63e594def5cf457959f93155.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h         |  1 -
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 46 --------------------------
 fs/resctrl/internal.h                  |  9 -----
 fs/resctrl/rdtgroup.c                  | 24 --------------
 include/linux/arm_mpam.h               |  5 ---
 include/linux/resctrl.h                |  2 --
 6 files changed, 87 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 04be7e43f015..4665cb7cfb5e 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -227,7 +227,6 @@ bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l);
 int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
 
 bool resctrl_arch_is_hwdrc_mb_capable(void);
-int resctrl_arch_set_hwdrc_enabled(enum resctrl_res_level l, bool hwdrc_mb);
 
 #else
 
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 405f70c770d1..038107195f2e 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -290,52 +290,6 @@ bool resctrl_arch_is_hwdrc_mb_capable(void)
 	return false;
 }
 
-static void mba_enable(enum resctrl_res_level l)
-{
-	struct rdt_hw_resource *r_hw = &rdt_resources_all[l];
-	struct rdt_resource *r = &r_hw->r_resctrl;
-
-	r->alloc_capable = true;
-}
-
-static void mba_disable(enum resctrl_res_level l)
-{
-	struct rdt_hw_resource *r_hw = &rdt_resources_all[l];
-	struct rdt_resource *r = &r_hw->r_resctrl;
-
-	r->alloc_capable = false;
-}
-
-/*
- * Currently memory bandwidth HWDRC feature is enabled or disabled by the user
- * outside of the scope of the resctrl filesystem. When memory bandwidth HWDRC
- * is enabled, it takes over MBA hooks in resctrl for memory bandwidth
- * throttling.
- *
- * Set memory bandwidth HWDRC enabled in resctrl so that the user who enables
- * memory bandwidth HWDRC can make sure that resctrl doesn't provide any hooks
- * to control MBA.
- *
- * Set memory bandwidth HWDRC disabled in resctrl, MBA is enabled by default.
- */
-int resctrl_arch_set_hwdrc_enabled(enum resctrl_res_level l, bool hwdrc_mb)
-{
-	struct rdt_resource *r = &rdt_resources_all[l].r_resctrl;
-
-	if (!resctrl_arch_is_hwdrc_mb_capable() || hwdrc_mb == r->membw.hwdrc_mb)
-		return -EINVAL;
-
-	/* MBA and memory bandwidth HWDRC features are mutually exclusive */
-	if (hwdrc_mb)
-		mba_disable(l);
-	else
-		mba_enable(l);
-
-	r->membw.hwdrc_mb = hwdrc_mb;
-
-	return 0;
-}
-
 static int reset_all_ctrls(struct rdt_resource *r)
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index 6b378466d8a4..b8afeee36fff 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -58,7 +58,6 @@ struct rdt_fs_context {
 	bool				enable_cdpl3;
 	bool				enable_mba_mbps;
 	bool				enable_debug;
-	bool				enable_hwdrc_mb;
 };
 
 static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
@@ -249,14 +248,6 @@ static inline  bool is_mba_sc(struct rdt_resource *r)
 	return r->membw.mba_sc;
 }
 
-static inline bool is_hwdrc_enabled(struct rdt_resource *r)
-{
-	if (!r)
-		r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-
-	return r->membw.hwdrc_mb;
-}
-
 extern struct mutex rdtgroup_mutex;
 extern struct rdtgroup rdtgroup_default;
 extern struct dentry *debugfs_resctrl;
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index e2a8de53d639..643ea199c428 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -2362,7 +2362,6 @@ static void rdt_disable_ctx(void)
 	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
 	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
 	set_mba_sc(false);
-	resctrl_arch_set_hwdrc_enabled(RDT_RESOURCE_MBA, false);
 
 	resctrl_debug = false;
 }
@@ -2383,19 +2382,6 @@ static int rdt_enable_ctx(struct rdt_fs_context *ctx)
 			goto out_cdpl2;
 	}
 
-	/*
-	 * MBA and memory bandwidth HWDRC features are mutually exclusive.
-	 * So mba_MBps and hwdrc_mb options could not be set at the same time.
-	 */
-	if (ctx->enable_hwdrc_mb && ctx->enable_mba_mbps) {
-		pr_debug("Option 'mba_MBps' and 'hwdrc_mb' are mutually exclusive\n");
-		ret = -EINVAL;
-		goto out_cdpl3;
-	}
-
-	if (!ret && ctx->enable_hwdrc_mb)
-		ret = resctrl_arch_set_hwdrc_enabled(RDT_RESOURCE_MBA, true);
-
 	if (ctx->enable_mba_mbps) {
 		ret = set_mba_sc(true);
 		if (ret)
@@ -2624,7 +2610,6 @@ enum rdt_param {
 	Opt_cdp,
 	Opt_cdpl2,
 	Opt_mba_mbps,
-	Opt_hwdrc_mb,
 	Opt_debug,
 	nr__rdt_params
 };
@@ -2633,7 +2618,6 @@ static const struct fs_parameter_spec rdt_fs_parameters[] = {
 	fsparam_flag("cdp",		Opt_cdp),
 	fsparam_flag("cdpl2",		Opt_cdpl2),
 	fsparam_flag("mba_MBps",	Opt_mba_mbps),
-	fsparam_flag("hwdrc_mb",	Opt_hwdrc_mb),
 	fsparam_flag("debug",		Opt_debug),
 	{}
 };
@@ -2660,11 +2644,6 @@ static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
 			return -EINVAL;
 		ctx->enable_mba_mbps = true;
 		return 0;
-	case Opt_hwdrc_mb:
-		if (!resctrl_arch_is_hwdrc_mb_capable())
-			return -EINVAL;
-		ctx->enable_hwdrc_mb = true;
-		return 0;
 	case Opt_debug:
 		ctx->enable_debug = true;
 		return 0;
@@ -3761,9 +3740,6 @@ static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
 	if (is_mba_sc(resctrl_arch_get_resource(RDT_RESOURCE_MBA)))
 		seq_puts(seq, ",mba_MBps");
 
-	if (is_hwdrc_enabled(resctrl_arch_get_resource(RDT_RESOURCE_MBA)))
-		seq_puts(seq, ",hwdrc_mb");
-
 	if (resctrl_debug)
 		seq_puts(seq, ",debug");
 
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index b3be84f24c72..370fa3f2a7c9 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -88,11 +88,6 @@ static inline bool resctrl_arch_is_hwdrc_mb_capable(void)
 	return false;
 }
 
-static inline int resctrl_arch_set_hwdrc_enabled(enum resctrl_res_level ignored, bool hwdrc_mb)
-{
-	return hwdrc_mb ? -EINVAL : 0;
-}
-
 /* reset cached configurations, then all devices */
 void resctrl_arch_reset_resources(void);
 
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 5d06695671e2..b1ee49c5bc64 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -165,7 +165,6 @@ enum membw_throttle_mode {
  * @throttle_mode:	Bandwidth throttling mode when threads request
  *			different memory bandwidths
  * @mba_sc:		True if MBA software controller(mba_sc) is enabled
- * @hwdrc_mb:		True if memory bandwidth HWDRC is enabled
  * @mb_map:		Mapping of memory B/W percentage to memory B/W delay
  */
 struct resctrl_membw {
@@ -175,7 +174,6 @@ struct resctrl_membw {
 	bool				arch_needs_linear;
 	enum membw_throttle_mode	throttle_mode;
 	bool				mba_sc;
-	bool				hwdrc_mb;
 	u32				*mb_map;
 };
 
-- 
Gitee


From 93a8b7cef6dcf8416da5c3767081ed521b772005 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 22:54:28 -0800
Subject: [PATCH 034/280] anolis: Revert "anolis: x86/resctrl: Workaround to
 detect if memory bandwidth HWDRC is capable"

ANBZ: #31045

This reverts commit 5d9672616f1157fc2ce32f6f1cb379457f49e3e0.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h         |  2 -
 arch/x86/kernel/cpu/resctrl/internal.h | 11 ----
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 79 --------------------------
 include/linux/arm_mpam.h               |  5 --
 4 files changed, 97 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 4665cb7cfb5e..f159bddbec51 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -226,8 +226,6 @@ void resctrl_cpu_detect(struct cpuinfo_x86 *c);
 bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l);
 int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
 
-bool resctrl_arch_is_hwdrc_mb_capable(void);
-
 #else
 
 static inline void resctrl_arch_sched_in(struct task_struct *tsk) {}
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 270953d9db4d..bf3538992667 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -10,16 +10,6 @@
 #include <linux/tick.h>
 
 #include <asm/resctrl.h>
-#include <asm/intel-family.h>
-
-/* Memory bandwidth HWDRC */
-#define HWDRC_MSR_OS_MAILBOX_INTERFACE	0xb0
-#define HWDRC_MSR_OS_MAILBOX_DATA	0xb1
-#define HWDRC_MSR_OS_MAILBOX_BUSY_BIT	BIT_ULL(31)
-#define HWDRC_COMMAND_MEM_CLOS_EN	0xd0
-#define HWDRC_SUB_COMMAND_MEM_CLOS_EN	0x54
-#define HWDRC_MEMCLOS_AVAILABLE		BIT_ULL(0)
-#define HWDRC_OS_MAILBOX_RETRY_COUNT	30
 
 #define L3_QOS_CDP_ENABLE		0x01ULL
 
@@ -29,7 +19,6 @@
 
 #define RMID_VAL_ERROR			BIT_ULL(63)
 #define RMID_VAL_UNAVAIL		BIT_ULL(62)
-
 /*
  * With the above fields in use 62 bits remain in MSR_IA32_QM_CTR for
  * data to be returned. The counter width is discovered from the hardware
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 038107195f2e..fe3952514add 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -211,85 +211,6 @@ int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable)
 	return 0;
 }
 
-/*
- * Workaround to detect if memory bandwidth HWDRC feature is capable.
- *
- * CPUID for memory bandwidth HWDRC feature is not exposed by H/W.
- * Check presence of HWDRC OS mailbox MSRs. Read out the discovery bit of
- * HWDRC OS mailbox data which indicates if the feature is capable.
- */
-bool resctrl_arch_is_hwdrc_mb_capable(void)
-{
-	u32 retries;
-	u64 data;
-	int status;
-
-	/* Only enable memory bandwidth HWDRC after ICELAKE server */
-	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL ||
-	    boot_cpu_data.x86_model < INTEL_FAM6_ICELAKE_X) {
-		pr_debug("HWDRC: Not support until ICELAKE server\n");
-		goto out;
-	}
-
-	/* Check presence of mailbox MSRs */
-	if (rdmsrl_safe(HWDRC_MSR_OS_MAILBOX_INTERFACE, &data)) {
-		pr_debug("HWDRC: Can't access OS mailbox interface MSR\n");
-		goto out;
-	}
-
-	if (rdmsrl_safe(HWDRC_MSR_OS_MAILBOX_DATA, &data)) {
-		pr_debug("HWDRC: Can't access OS mailbox data MSR\n");
-		goto out;
-	}
-
-	/* Poll for run_busy bit == 0 */
-	status = -EBUSY;
-	retries = HWDRC_OS_MAILBOX_RETRY_COUNT;
-	do {
-		rdmsrl(HWDRC_MSR_OS_MAILBOX_INTERFACE, data);
-		if (!(data & HWDRC_MSR_OS_MAILBOX_BUSY_BIT)) {
-			status = 0;
-			break;
-		}
-	} while (--retries);
-
-	if (status)
-		goto out;
-
-	/* Write command register: 0x800054d0 */
-	data = HWDRC_MSR_OS_MAILBOX_BUSY_BIT |
-		HWDRC_SUB_COMMAND_MEM_CLOS_EN << 8 |
-		HWDRC_COMMAND_MEM_CLOS_EN;
-	pr_debug("HWDRC: Write command register: 0x%llx\n", data);
-	if (wrmsrl_safe(HWDRC_MSR_OS_MAILBOX_INTERFACE, data)) {
-		pr_debug("HWDRC: Write command register 0x%llx failed!\n", data);
-		goto out;
-	}
-
-	/* Poll for run_busy bit == 0 */
-	retries = HWDRC_OS_MAILBOX_RETRY_COUNT;
-	do {
-		rdmsrl(HWDRC_MSR_OS_MAILBOX_INTERFACE, data);
-		if (!(data & HWDRC_MSR_OS_MAILBOX_BUSY_BIT)) {
-			rdmsrl(HWDRC_MSR_OS_MAILBOX_DATA, data);
-			pr_debug("HWDRC: Read MEM_CLOS_EN data: 0x%llx\n", data);
-
-			/* Feature capability bit is set */
-			if (data & HWDRC_MEMCLOS_AVAILABLE) {
-				pr_debug("HWDRC: Memory bandwidth HWDRC is capable\n");
-				return true;
-			}
-
-			/* Feature capability bit is not set */
-			break;
-		}
-	} while (--retries);
-
-out:
-	pr_debug("HWDRC: Memory bandwidth HWDRC is not capable\n");
-	return false;
-}
-
 static int reset_all_ctrls(struct rdt_resource *r)
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index 370fa3f2a7c9..660776491941 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -83,11 +83,6 @@ bool resctrl_arch_is_mbm_local_enabled(void);
 bool resctrl_arch_is_mbm_total_enabled(void);
 bool resctrl_arch_is_mbm_bps_enabled(void);
 
-static inline bool resctrl_arch_is_hwdrc_mb_capable(void)
-{
-	return false;
-}
-
 /* reset cached configurations, then all devices */
 void resctrl_arch_reset_resources(void);
 
-- 
Gitee


From d9bce38530dc06e3e4124d73489e3c8ddf3f21aa Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 22:54:58 -0800
Subject: [PATCH 035/280] anolis: Revert "anolis: resctrl: fix UAF when domain
 offline"

ANBZ: #31045

This reverts commit f6c5c597bd5049d769f00d5db667d77f23a3618c.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c   |  5 -----
 drivers/platform/mpam/mpam_resctrl.c |  7 -------
 fs/resctrl/monitor.c                 | 13 -------------
 include/linux/resctrl.h              |  1 -
 4 files changed, 26 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 49bea5e5c196..51389ebc0f19 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -497,7 +497,6 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 	struct rdt_domain *d;
 	int err;
 
-	BUG_ON(id > NR_CPUS);
 	lockdep_assert_held(&domain_list_lock);
 
 	d = rdt_find_domain(r, id, &add_pos);
@@ -519,8 +518,6 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 
 	d = &hw_dom->d_resctrl;
 	d->id = id;
-	r->rdt_domain_list[id] = d;
-
 	cpumask_set_cpu(cpu, &d->cpu_mask);
 
 	rdt_domain_reconfigure_cdp(r);
@@ -551,7 +548,6 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
 	struct rdt_hw_domain *hw_dom;
 	struct rdt_domain *d;
 
-	BUG_ON(id > NR_CPUS);
 	lockdep_assert_held(&domain_list_lock);
 
 	d = rdt_find_domain(r, id, NULL);
@@ -573,7 +569,6 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
 		 */
 		if (d->plr)
 			d->plr->d = NULL;
-		r->rdt_domain_list[id] = NULL;
 		domain_free(hw_dom);
 
 		return;
diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 55848a9c321c..98b3b1baa91e 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -1197,11 +1197,9 @@ int mpam_resctrl_online_cpu(unsigned int cpu)
 	int i, err;
 	struct mpam_resctrl_dom *dom;
 	struct mpam_resctrl_res *res;
-	struct rdt_resource *r;
 
 	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
 		res = &mpam_resctrl_exports[i];
-		r = &res->resctrl_res;
 
 		if (!res->class)
 			continue;	// dummy_resource;
@@ -1215,7 +1213,6 @@ int mpam_resctrl_online_cpu(unsigned int cpu)
 		dom = mpam_resctrl_alloc_domain(cpu, res);
 		if (IS_ERR(dom))
 			return PTR_ERR(dom);
-		r->rdt_domain_list[i] = &dom->resctrl_dom;
 		err = resctrl_online_domain(&res->resctrl_res, &dom->resctrl_dom);
 		if (err)
 			return err;
@@ -1231,13 +1228,11 @@ int mpam_resctrl_offline_cpu(unsigned int cpu)
 	struct rdt_domain *d;
 	struct mpam_resctrl_res *res;
 	struct mpam_resctrl_dom *dom;
-	struct rdt_resource *r;
 
 	resctrl_offline_cpu(cpu);
 
 	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
 		res = &mpam_resctrl_exports[i];
-		r = &res->resctrl_res;
 
 		if (!res->class)
 			continue;	// dummy resource
@@ -1256,8 +1251,6 @@ int mpam_resctrl_offline_cpu(unsigned int cpu)
 
 		resctrl_offline_domain(&res->resctrl_res, &dom->resctrl_dom);
 		list_del(&d->list);
-
-		r->rdt_domain_list[i] = NULL;
 		kfree(dom);
 	}
 
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index 62ae06aac20d..ea4183cc48ad 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -626,16 +626,6 @@ void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms,
 		schedule_delayed_work_on(cpu, &dom->cqm_limbo, delay);
 }
 
-bool is_rdt_domain_valid(struct rdt_resource *r, struct rdt_domain *d)
-{
-	int i;
-
-	for (i = 0; i < NR_CPUS; i++)
-		if (r->rdt_domain_list[i] == d)
-			return true;
-	return false;
-}
-
 void mbm_handle_overflow(struct work_struct *work)
 {
 	unsigned long delay = msecs_to_jiffies(MBM_OVERFLOW_INTERVAL);
@@ -657,9 +647,6 @@ void mbm_handle_overflow(struct work_struct *work)
 	r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
 	d = container_of(work, struct rdt_domain, mbm_over.work);
 
-	if (!is_rdt_domain_valid(r, d))
-		goto out_unlock;
-
 	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
 		mbm_update(r, d, prgrp->closid, prgrp->mon.rmid);
 
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index b1ee49c5bc64..dc80ddab26cf 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -214,7 +214,6 @@ struct rdt_resource {
 	unsigned long		fflags;
 	unsigned int		mbm_cfg_mask;
 	bool			cdp_capable;
-	struct rdt_domain	*rdt_domain_list[NR_CPUS];
 };
 
 /*
-- 
Gitee


From d088b63660aed5e56f4e0475b8005f3a5dff4560 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 22:55:24 -0800
Subject: [PATCH 036/280] anolis: Revert "anolis: aarch64: MPAM: Disable MPAM
 function by default"

ANBZ: #31045

This reverts commit 68bf068860aa1761b39cae2a4f6e7729ee7de950.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c | 13 -------------
 1 file changed, 13 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index c7dfc1e17ed6..0134263c88af 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -2460,21 +2460,8 @@ static int __init arm64_mpam_register_cpus(void)
 	return mpam_register_requestor(partid_max, pmg_max);
 }
 
-static int mpam_on;
-
-static int __init mpam_on_setup(char *str)
-{
-	mpam_on = 1;
-	pr_info("MPAM is supported now");
-	return 1;
-}
-__setup("mpam_on", mpam_on_setup);
-
 static int __init mpam_msc_driver_init(void)
 {
-	if (!mpam_on)
-		return 0;
-
 	bool mpam_not_available = false;
 	int err;
 
-- 
Gitee


From 7de6818c1f3cbf6cb3a34eeb891c84688c0890b0 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 22:59:53 -0800
Subject: [PATCH 037/280] anolis: Revert mpam part of "anolis: KVM: arm64:
 Adapt kernel to allow KVM to be built as a module"

ANBZ: #31045

This reverts mpam part of ec04d85a267cca5a8bdbec98db83bb5af719ca41

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/arm64/kernel/mpam.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/arm64/kernel/mpam.c b/arch/arm64/kernel/mpam.c
index 190a0aa4f9c0..134b44118553 100644
--- a/arch/arm64/kernel/mpam.c
+++ b/arch/arm64/kernel/mpam.c
@@ -8,8 +8,6 @@
 #include <linux/percpu.h>
 
 DEFINE_STATIC_KEY_FALSE(arm64_mpam_has_hcr);
-EXPORT_SYMBOL_FOR_KVM(arm64_mpam_has_hcr);
 DEFINE_STATIC_KEY_FALSE(mpam_enabled);
-EXPORT_SYMBOL_FOR_KVM(mpam_enabled);
 DEFINE_PER_CPU(u64, arm64_mpam_default);
 DEFINE_PER_CPU(u64, arm64_mpam_current);
-- 
Gitee


From 1574f278a4b48b8cd0db6168c4f00f5d9387450d Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:03:20 -0800
Subject: [PATCH 038/280] anolis: Revert "x86/resctrl: Don't try to free
 nonexistent RMIDs"

ANBZ: #31045

This reverts commit 209b480199f0caf5d26c8666fd654c7232d540a2.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/monitor.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index ea4183cc48ad..51baa0f71b65 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -312,8 +312,7 @@ void free_rmid(u32 closid, u32 rmid)
 	 * allows architectures that ignore the closid parameter to avoid an
 	 * unnecessary check.
 	 */
-	if (!resctrl_arch_mon_capable() ||
-	    idx == resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
+	if (idx == resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
 						RESCTRL_RESERVED_RMID))
 		return;
 
-- 
Gitee


From 1bf672bb121ed4479fbe1afdc3925de7274222db Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:03:26 -0800
Subject: [PATCH 039/280] anolis: Revert "x86/resctrl: Fix uninitialized memory
 read when last CPU of domain goes offline"

ANBZ: #31045

This reverts commit ba1377ba3b97ce7b4adcf09e673c1ac08da7f543.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/internal.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index b8afeee36fff..f73267762a87 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -33,8 +33,7 @@ cpumask_any_housekeeping(const struct cpumask *mask, int exclude_cpu)
 	else
 		cpu = cpumask_any_but(mask, exclude_cpu);
 
-	/* Only continue if tick_nohz_full_mask has been initialized. */
-	if (!tick_nohz_full_enabled())
+	if (!IS_ENABLED(CONFIG_NO_HZ_FULL))
 		return cpu;
 
 	/* If the CPU picked isn't marked nohz_full nothing more needs doing. */
-- 
Gitee


From 90dfd7b440fdb0712639f46a904ad9eb505d73ca Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:04:05 -0800
Subject: [PATCH 040/280] anolis: Revert "anolis: arm_mpam: Fix the ris field
 parsing typo in error irq handler"

ANBZ: #31045

This reverts commit 5aaebd3dc29c55eac8365e61d6bff0b8fc40d91d.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 0134263c88af..906f8a6b6940 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -2055,7 +2055,7 @@ static irqreturn_t __mpam_irq_handler(int irq, struct mpam_msc *msc)
 
 	partid = FIELD_GET(MPAMF_ESR_PARTID_OR_MON, reg);
 	pmg = FIELD_GET(MPAMF_ESR_PMG, reg);
-	ris = FIELD_GET(MPAMF_ESR_RIS, reg);
+	ris = FIELD_GET(MPAMF_ESR_PMG, reg);
 
 	pr_err("error irq from msc:%u '%s', partid:%u, pmg: %u, ris: %u\n",
 	       msc->id, mpam_errcode_names[errcode], partid, pmg, ris);
-- 
Gitee


From b99232e5a31e54d215d3eac9deb1d456c3bf5996 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:04:11 -0800
Subject: [PATCH 041/280] anolis: Revert "anolis: fs/resctrl: Cancel the
 delayed checking works when resctrl is umounted"

ANBZ: #31045

This reverts commit c6d8096ec77eb2a84eb8341490b3e687856f9cd1.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/rdtgroup.c | 17 -----------------
 1 file changed, 17 deletions(-)

diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 643ea199c428..ea969ddb1a9d 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -2792,9 +2792,6 @@ static void rmdir_all_sub(void)
 
 static void rdt_kill_sb(struct super_block *sb)
 {
-	struct rdt_resource *l3 = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	struct rdt_domain *d;
-
 	cpus_read_lock();
 	mutex_lock(&rdtgroup_mutex);
 
@@ -2804,20 +2801,6 @@ static void rdt_kill_sb(struct super_block *sb)
 	resctrl_arch_reset_resources();
 
 	rmdir_all_sub();
-
-	/*
-	 * When resctrl is umounted, forcefully cancel delayed works since the
-	 * new mount option may be changed.
-	 */
-	list_for_each_entry(d, &l3->domains, list) {
-		if (resctrl_is_mbm_enabled())
-			cancel_delayed_work(&d->mbm_over);
-		if (resctrl_arch_is_llc_occupancy_enabled() && has_busy_rmid(d)) {
-			__check_limbo(d, true);
-			cancel_delayed_work(&d->cqm_limbo);
-		}
-	}
-
 	rdt_pseudo_lock_release();
 	rdtgroup_default.mode = RDT_MODE_SHAREABLE;
 	schemata_list_destroy();
-- 
Gitee


From 59c04a2bb4d35711e35c1eb0dd252411c57f6696 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:04:18 -0800
Subject: [PATCH 042/280] anolis: Revert "anolis: fs/resctrl: Remove mbm_Bps
 features checking from resctrl_is_mbm_{enabled,event}"

ANBZ: #31045

This reverts commit 327fc4be6787d9f29b3b185d1bc29c9fdd9d2131.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/rdtgroup.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index ea969ddb1a9d..e39f22453d84 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -113,13 +113,14 @@ void rdt_staged_configs_clear(void)
 static bool resctrl_is_mbm_enabled(void)
 {
 	return (resctrl_arch_is_mbm_total_enabled() ||
-		resctrl_arch_is_mbm_local_enabled());
+		resctrl_arch_is_mbm_local_enabled() ||
+		resctrl_arch_is_mbm_bps_enabled());
 }
 
 static bool resctrl_is_mbm_event(int e)
 {
 	return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
-		e <= QOS_L3_MBM_LOCAL_EVENT_ID);
+		e <= QOS_MC_MBM_BPS_EVENT_ID);
 }
 
 /*
-- 
Gitee


From d5040860d3cec10b0ef72351d03d1364661dde2c Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:29:42 -0800
Subject: [PATCH 043/280] anolis: Revert "anolis: configs: arm64: Enable
 ARM64_MPAM"

ANBZ: #31045

This reverts 744373f990ebbb8d3b936c5d53457c76f27fc7fc

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 anolis/configs/L0-MANDATORY/arm64/CONFIG_ARM64_MPAM | 1 -
 1 file changed, 1 deletion(-)
 delete mode 100644 anolis/configs/L0-MANDATORY/arm64/CONFIG_ARM64_MPAM

diff --git a/anolis/configs/L0-MANDATORY/arm64/CONFIG_ARM64_MPAM b/anolis/configs/L0-MANDATORY/arm64/CONFIG_ARM64_MPAM
deleted file mode 100644
index 45957b7b4ea2..000000000000
--- a/anolis/configs/L0-MANDATORY/arm64/CONFIG_ARM64_MPAM
+++ /dev/null
@@ -1 +0,0 @@
-CONFIG_ARM64_MPAM=y
-- 
Gitee


From aff3f86d1da496199339053c23aa89571e71628d Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:31:33 -0800
Subject: [PATCH 044/280] anolis: Revert "anolis: KVM: arm64: Only access MPAM
 registers when MPAM is enabled"

ANBZ: #31045

This reverts commit 3161da4713cdf31acc76f93698c39b734aef2382.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/arm64/kernel/image-vars.h             | 1 -
 arch/arm64/kvm/hyp/include/hyp/switch.h    | 4 ++--
 arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h | 6 ++----
 arch/arm64/kvm/hyp/nvhe/switch.c           | 3 +--
 4 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index 6999668e9ecf..d10d3fed31d9 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -67,7 +67,6 @@ KVM_NVHE_ALIAS(__hyp_stub_vectors);
 /* Additional static keys for cpufeatures */
 #ifdef CONFIG_ARM64_MPAM
 KVM_NVHE_ALIAS(arm64_mpam_has_hcr);
-KVM_NVHE_ALIAS(mpam_enabled);
 #endif
 
 /* Static keys which are set if a vGIC trap should be handled in hyp. */
diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
index d274244e1b44..2679527eb2f3 100644
--- a/arch/arm64/kvm/hyp/include/hyp/switch.h
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -177,7 +177,7 @@ static inline void  __activate_traps_mpam(struct kvm_vcpu *vcpu)
 {
 	u64 r = MPAM_SYSREG_TRAP_MPAM0_EL1 | MPAM_SYSREG_TRAP_MPAM1_EL1;
 
-	if (!mpam_cpus_have_feature() || !static_branch_likely(&mpam_enabled))
+	if (!mpam_cpus_have_feature())
 		return;
 
 	/* trap guest access to MPAMIDR_EL1 */
@@ -193,7 +193,7 @@ static inline void  __activate_traps_mpam(struct kvm_vcpu *vcpu)
 
 static inline void __deactivate_traps_mpam(void)
 {
-	if (!mpam_cpus_have_feature() || !static_branch_likely(&mpam_enabled))
+	if (!mpam_cpus_have_feature())
 		return;
 
 	write_sysreg_s(0, SYS_MPAM2_EL2);
diff --git a/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h b/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h
index 8e99f66b377b..c8767abd693e 100644
--- a/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h
+++ b/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h
@@ -250,8 +250,7 @@ static inline void __sysreg32_restore_state(struct kvm_vcpu *vcpu)
  */
 static inline void __mpam_guest_load(void)
 {
-	if (IS_ENABLED(CONFIG_ARM64_MPAM) && mpam_cpus_have_feature() &&
-	    static_branch_likely(&mpam_enabled))
+	if (IS_ENABLED(CONFIG_ARM64_MPAM) && mpam_cpus_have_feature())
 		write_sysreg_el1(read_sysreg_s(SYS_MPAM0_EL1), SYS_MPAM1);
 }
 
@@ -265,8 +264,7 @@ static inline void __mpam_guest_put(void)
 	u64 val, mask = MPAM_SYSREG_PMG_D | MPAM_SYSREG_PMG_I |
 			MPAM_SYSREG_PARTID_D | MPAM_SYSREG_PARTID_I;
 
-	if (IS_ENABLED(CONFIG_ARM64_MPAM) && mpam_cpus_have_feature() &&
-	    static_branch_likely(&mpam_enabled)) {
+	if (IS_ENABLED(CONFIG_ARM64_MPAM) && mpam_cpus_have_feature()) {
 		val = FIELD_GET(mask, read_sysreg_s(SYS_MPAM2_EL2));
 		write_sysreg_el1(val, SYS_MPAM1);
 	}
diff --git a/arch/arm64/kvm/hyp/nvhe/switch.c b/arch/arm64/kvm/hyp/nvhe/switch.c
index 024a7871892f..3ff46a88f1f4 100644
--- a/arch/arm64/kvm/hyp/nvhe/switch.c
+++ b/arch/arm64/kvm/hyp/nvhe/switch.c
@@ -285,8 +285,7 @@ static inline bool fixup_guest_exit(struct kvm_vcpu *vcpu, u64 *exit_code)
 /* Use the host thread's partid and pmg for world switch */
 static void __mpam_copy_el1_to_el2(void)
 {
-	if (IS_ENABLED(CONFIG_ARM64_MPAM) && mpam_cpus_have_feature() &&
-	    static_branch_likely(&mpam_enabled))
+	if (IS_ENABLED(CONFIG_ARM64_MPAM) && mpam_cpus_have_feature())
 		write_sysreg_s(read_sysreg_s(SYS_MPAM1_EL1), SYS_MPAM2_EL2);
 }
 
-- 
Gitee


From 9d6843ea4f8b48094755f3cbeac7d15d6fdee22c Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:34:46 -0800
Subject: [PATCH 045/280] anolis: Revert "anolis: arm_mpam: Fix kernel boot
 failure when the firmware does not support MPAM"

ANBZ: #31045

This reverts commit 9686c02c71809bd76e5acc7c17db979037d48ef9.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/arm64/include/asm/cpu.h         |  1 +
 arch/arm64/include/asm/cpufeature.h  |  6 +++
 arch/arm64/kernel/cpufeature.c       | 62 +++++++++++++++++++++++++++-
 arch/arm64/kernel/cpuinfo.c          |  4 ++
 arch/arm64/kernel/mpam.c             | 10 +++++
 drivers/platform/mpam/mpam_devices.c | 40 +++++-------------
 6 files changed, 92 insertions(+), 31 deletions(-)

diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h
index 6344fc126262..33328b1d4a39 100644
--- a/arch/arm64/include/asm/cpu.h
+++ b/arch/arm64/include/asm/cpu.h
@@ -47,6 +47,7 @@ struct cpuinfo_arm64 {
 	u64		reg_revidr;
 	u64		reg_gmid;
 	u64		reg_smidr;
+	u64		reg_mpamidr;
 
 	u64		reg_id_aa64dfr0;
 	u64		reg_id_aa64dfr1;
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 385a6c162c32..4e980563ad95 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -855,6 +855,12 @@ static inline bool system_supports_gcs(void)
 		alternative_has_cap_unlikely(ARM64_HAS_GCS);
 }
 
+static inline bool cpus_support_mpam(void)
+{
+	return IS_ENABLED(CONFIG_ARM64_MPAM) &&
+		cpus_have_final_cap(ARM64_MPAM);
+}
+
 int do_emulate_mrs(struct pt_regs *regs, u32 sys_reg, u32 rt);
 bool try_emulate_mrs(struct pt_regs *regs, u32 isn);
 
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 6b50132aed89..62eceb2cf5d0 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -84,6 +84,7 @@
 #include <asm/insn.h>
 #include <asm/kvm_host.h>
 #include <asm/mmu_context.h>
+#include <asm/mpam.h>
 #include <asm/mte.h>
 #include <asm/processor.h>
 #include <asm/smp.h>
@@ -665,6 +666,18 @@ static const struct arm64_ftr_bits ftr_smcr[] = {
 	ARM64_FTR_END,
 };
 
+static const struct arm64_ftr_bits ftr_mpamidr[] = {
+	ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE,
+		MPAMIDR_PMG_MAX_SHIFT, MPAMIDR_PMG_MAX_LEN, 0),        /* PMG_MAX */
+	ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE,
+		MPAMIDR_VPMR_MAX_SHIFT, MPAMIDR_VPMR_MAX_LEN, 0),      /* VPMR_MAX */
+	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE,
+		MPAMIDR_HAS_HCR_SHIFT, 1, 0), /* HAS_HCR */
+	ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE,
+		MPAMIDR_PARTID_MAX_SHIFT, MPAMIDR_PARTID_MAX_LEN, 0),  /* PARTID_MAX */
+	ARM64_FTR_END,
+};
+
 /*
  * Common ftr bits for a 32bit register with all hidden, strict
  * attributes, with 4bit feature fields and a default safe value of
@@ -784,6 +797,9 @@ static const struct __ftr_reg_entry {
 	ARM64_FTR_REG(SYS_ZCR_EL1, ftr_zcr),
 	ARM64_FTR_REG(SYS_SMCR_EL1, ftr_smcr),
 
+	/* Op1 = 0, CRn = 10, CRm = 4 */
+	ARM64_FTR_REG(SYS_MPAMIDR_EL1, ftr_mpamidr),
+
 	/* Op1 = 1, CRn = 0, CRm = 0 */
 	ARM64_FTR_REG(SYS_GMID_EL1, ftr_gmid),
 
@@ -1108,6 +1124,9 @@ void __init init_cpu_features(struct cpuinfo_arm64 *info)
 		vec_init_vq_map(ARM64_VEC_SME);
 	}
 
+	if (id_aa64pfr0_mpam(info->reg_id_aa64pfr0))
+		init_cpu_ftr_reg(SYS_MPAMIDR_EL1, info->reg_mpamidr);
+
 	if (id_aa64pfr1_mte(info->reg_id_aa64pfr1))
 		init_cpu_ftr_reg(SYS_GMID_EL1, info->reg_gmid);
 
@@ -1374,6 +1393,11 @@ void update_cpu_features(int cpu,
 			vec_update_vq_map(ARM64_VEC_SME);
 	}
 
+	if (id_aa64pfr0_mpam(info->reg_id_aa64pfr0)) {
+		taint |= check_update_ftr_reg(SYS_MPAMIDR_EL1, cpu,
+					info->reg_mpamidr, boot->reg_mpamidr);
+	}
+
 	/*
 	 * The kernel uses the LDGM/STGM instructions and the number of tags
 	 * they read/write depends on the GMID_EL1.BS field. Check that the
@@ -2326,6 +2350,39 @@ cpucap_panic_on_conflict(const struct arm64_cpu_capabilities *cap)
 	return !!(cap->type & ARM64_CPUCAP_PANIC_ON_CONFLICT);
 }
 
+static bool __maybe_unused
+test_has_mpam(const struct arm64_cpu_capabilities *entry, int scope)
+{
+	if (!has_cpuid_feature(entry, scope))
+		return false;
+
+	/* Check firmware actually enabled MPAM on this cpu. */
+	return (read_sysreg_s(SYS_MPAM1_EL1) & MPAM_SYSREG_EN);
+}
+
+static void __maybe_unused
+cpu_enable_mpam(const struct arm64_cpu_capabilities *entry)
+{
+	/*
+	 * Access by the kernel (at EL1) should use the reserved PARTID
+	 * which is configured unrestricted. This avoids priority-inversion
+	 * where latency sensitive tasks have to wait for a task that has
+	 * been throttled to release the lock.
+	 */
+	write_sysreg_s(0, SYS_MPAM1_EL1);
+}
+
+static void mpam_extra_caps(void)
+{
+	u64 idr = read_sanitised_ftr_reg(SYS_MPAMIDR_EL1);
+
+	if (!IS_ENABLED(CONFIG_ARM64_MPAM))
+		return;
+
+	if (idr & MPAMIDR_HAS_HCR)
+		__enable_mpam_hcr();
+}
+
 static const struct arm64_cpu_capabilities arm64_features[] = {
 	{
 		.capability = ARM64_ALWAYS_BOOT,
@@ -2819,7 +2876,8 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
 		.desc = "Memory Partitioning And Monitoring",
 		.type = ARM64_CPUCAP_SYSTEM_FEATURE,
 		.capability = ARM64_MPAM,
-		.matches = has_cpuid_feature,
+		.matches = test_has_mpam,
+		.cpu_enable = cpu_enable_mpam,
 		ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, MPAM, 1)
 	},
 #endif
@@ -3537,6 +3595,8 @@ void __init setup_cpu_features(void)
 	if (!cwg)
 		pr_warn("No Cache Writeback Granule information, assuming %d\n",
 			ARCH_DMA_MINALIGN);
+
+	mpam_extra_caps();
 }
 
 static int enable_mismatched_32bit_el0(unsigned int cpu)
diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index d9d5ba68b1d7..8a41d13f97d1 100644
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -504,6 +504,10 @@ static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info)
 	if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0))
 		__cpuinfo_store_cpu_32bit(&info->aarch32);
 
+	if (IS_ENABLED(CONFIG_ARM64_MPAM) &&
+	    id_aa64pfr0_mpam(info->reg_id_aa64pfr0))
+		info->reg_mpamidr = read_cpuid(MPAMIDR_EL1);
+
 	cpuinfo_detect_icache_policy(info);
 }
 
diff --git a/arch/arm64/kernel/mpam.c b/arch/arm64/kernel/mpam.c
index 134b44118553..02f43334f078 100644
--- a/arch/arm64/kernel/mpam.c
+++ b/arch/arm64/kernel/mpam.c
@@ -11,3 +11,13 @@ DEFINE_STATIC_KEY_FALSE(arm64_mpam_has_hcr);
 DEFINE_STATIC_KEY_FALSE(mpam_enabled);
 DEFINE_PER_CPU(u64, arm64_mpam_default);
 DEFINE_PER_CPU(u64, arm64_mpam_current);
+
+static int __init arm64_mpam_register_cpus(void)
+{
+	u64 mpamidr = read_sanitised_ftr_reg(SYS_MPAMIDR_EL1);
+	u16 partid_max = FIELD_GET(MPAMIDR_PARTID_MAX, mpamidr);
+	u8 pmg_max = FIELD_GET(MPAMIDR_PMG_MAX, mpamidr);
+
+	return mpam_register_requestor(partid_max, pmg_max);
+}
+arch_initcall(arm64_mpam_register_cpus)
diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 906f8a6b6940..e1a1dee8578c 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -2451,19 +2451,9 @@ static void mpam_dt_create_foundling_msc(void)
 	}
 }
 
-static int __init arm64_mpam_register_cpus(void)
-{
-	u64 mpamidr = read_sysreg_s(SYS_MPAMIDR_EL1);
-	u16 partid_max = FIELD_GET(MPAMIDR_PARTID_MAX, mpamidr);
-	u8 pmg_max = FIELD_GET(MPAMIDR_PMG_MAX, mpamidr);
-
-	return mpam_register_requestor(partid_max, pmg_max);
-}
-
 static int __init mpam_msc_driver_init(void)
 {
 	bool mpam_not_available = false;
-	int err;
 
 	if (!mpam_cpus_have_feature())
 		return -EOPNOTSUPP;
@@ -2475,26 +2465,6 @@ static int __init mpam_msc_driver_init(void)
 	else
 		mpam_current_machine = mpam_dt_get_machine_type();
 
-	if (!acpi_disabled)
-		fw_num_msc = acpi_mpam_count_msc();
-	else
-		fw_num_msc = mpam_dt_count_msc();
-
-	if (fw_num_msc <= 0) {
-		pr_err("No MSC devices found in firmware\n");
-		return -EINVAL;
-	}
-
-	/*
-	 * Access MPAM system registers after MPAM ACPI table is parsed, since
-	 * some BIOSs disable MPAM system registers accessing but export MPAM in
-	 * ID_AA64PFR0_EL1. So we can only rely on the MPAM ACPI table to
-	 * determine whether MPAM feature is enabled.
-	 */
-	err = arm64_mpam_register_cpus();
-	if (err)
-		return err;
-
 	/*
 	 * If the MPAM CPU interface is not implemented, or reserved by
 	 * firmware, there is no point touching the rest of the hardware.
@@ -2507,6 +2477,16 @@ static int __init mpam_msc_driver_init(void)
 	if (mpam_not_available)
 		return 0;
 
+	if (!acpi_disabled)
+		fw_num_msc = acpi_mpam_count_msc();
+	else
+		fw_num_msc = mpam_dt_count_msc();
+
+	if (fw_num_msc <= 0) {
+		pr_err("No MSC devices found in firmware\n");
+		return -EINVAL;
+	}
+
 	if (acpi_disabled)
 		mpam_dt_create_foundling_msc();
 
-- 
Gitee


From 502ec5745e3da3ce90753c53490a76c54fe25034 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:34:49 -0800
Subject: [PATCH 046/280] anolis: Revert "anolis: arm_mpam: Maximize
 Yitian710's MB monitoring window width"

ANBZ: #31045

This reverts commit d91e1cbc9db5ca88216b8e5fcbe972aeb3ee6468.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index e1a1dee8578c..0827f2c61f91 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -1220,7 +1220,6 @@ static void mpam_reprogram_ris_partid(struct mpam_msc_ris *ris, u16 partid,
 	struct mpam_props *rprops = &ris->props;
 	u16 dspri = GENMASK(rprops->dspri_wd, 0);
 	u16 intpri = GENMASK(rprops->intpri_wd, 0);
-	u32 custom_reg_base_addr;
 
 	spin_lock(&msc->part_sel_lock);
 	__mpam_part_sel(ris->ris_idx, partid, msc);
@@ -1277,15 +1276,6 @@ static void mpam_reprogram_ris_partid(struct mpam_msc_ris *ris, u16 partid,
 		mpam_write_partsel_reg(msc, PRI, pri_val);
 	}
 
-	if (FIELD_GET(MPAMF_IDR_HAS_IMPL_IDR, ris->idr)) {
-		if (mpam_current_machine == MPAM_YITIAN710) {
-			custom_reg_base_addr = __mpam_read_reg(msc, MPAMF_IMPL_IDR);
-			__mpam_write_reg(msc, custom_reg_base_addr +
-					 MPAMF_CUST_WINDW_OFFSET,
-					 MBWU_WINWD_MAX);
-		}
-	}
-
 	spin_unlock(&msc->part_sel_lock);
 }
 
-- 
Gitee


From 3ba63921f4bbc891d173c6cca7872befc261b96b Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:34:51 -0800
Subject: [PATCH 047/280] anolis: Revert "anolis: fs/resctrl: Add a new resctrl
 monitoring event to get MB in Bps"

ANBZ: #31045

This reverts commit c8ca4112705d713c83ebdcc7a5aa2739f4281a13.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h        |  5 -----
 arch/x86/kernel/cpu/resctrl/monitor.c |  2 --
 drivers/platform/mpam/mpam_resctrl.c  | 29 ---------------------------
 fs/resctrl/monitor.c                  | 16 ---------------
 fs/resctrl/rdtgroup.c                 |  5 ++---
 include/linux/arm_mpam.h              |  1 -
 include/linux/resctrl_types.h         |  3 ---
 7 files changed, 2 insertions(+), 59 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index f159bddbec51..746431c66fc4 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -99,11 +99,6 @@ static inline bool resctrl_arch_is_mbm_local_enabled(void)
 	return (rdt_mon_features & (1 << QOS_L3_MBM_LOCAL_EVENT_ID));
 }
 
-static inline bool resctrl_arch_is_mbm_bps_enabled(void)
-{
-	return false;
-}
-
 /*
  * __resctrl_sched_in() - Writes the task's CLOSid/RMID to IA32_PQR_MSR
  *
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index e0cc1b499279..02fb9d87479a 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -134,8 +134,6 @@ static struct arch_mbm_state *get_arch_mbm_state(struct rdt_hw_domain *hw_dom,
 		return &hw_dom->arch_mbm_total[rmid];
 	case QOS_L3_MBM_LOCAL_EVENT_ID:
 		return &hw_dom->arch_mbm_local[rmid];
-	default:
-		break;
 	}
 
 	/* Never expect to get here */
diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 98b3b1baa91e..25cf64386b64 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -35,7 +35,6 @@ static bool exposed_alloc_capable;
 static bool exposed_mon_capable;
 static struct mpam_class *mbm_local_class;
 static struct mpam_class *mbm_total_class;
-static struct mpam_class *mbm_bps_class;
 
 /*
  * MPAM emulates CDP by setting different PARTID in the I/D fields of MPAM1_EL1.
@@ -80,11 +79,6 @@ bool resctrl_arch_is_mbm_total_enabled(void)
 	return mbm_total_class;
 }
 
-bool resctrl_arch_is_mbm_bps_enabled(void)
-{
-	return mbm_bps_class;
-}
-
 bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level rid)
 {
 	switch (rid) {
@@ -278,10 +272,6 @@ static void *resctrl_arch_mon_ctx_alloc_no_wait(struct rdt_resource *r,
 	case QOS_L3_MBM_LOCAL_EVENT_ID:
 	case QOS_L3_MBM_TOTAL_EVENT_ID:
 		return mon_is_rmid_idx;
-	case QOS_MC_MBM_BPS_EVENT_ID:
-		if (mpam_current_machine == MPAM_YITIAN710)
-			return mon_is_rmid_idx;
-		return ERR_PTR(-EOPNOTSUPP);
 	}
 
 	return ERR_PTR(-EOPNOTSUPP);
@@ -326,7 +316,6 @@ void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid,
 		return;
 	case QOS_L3_MBM_TOTAL_EVENT_ID:
 	case QOS_L3_MBM_LOCAL_EVENT_ID:
-	case QOS_MC_MBM_BPS_EVENT_ID:
 		return;
 	}
 }
@@ -366,10 +355,6 @@ int resctrl_arch_rmid_read(struct rdt_resource	*r, struct rdt_domain *d,
 	case QOS_L3_MBM_TOTAL_EVENT_ID:
 		type = mpam_feat_msmon_mbwu;
 		break;
-	case QOS_MC_MBM_BPS_EVENT_ID:
-		if (mpam_current_machine == MPAM_YITIAN710)
-			type = mpam_feat_impl_msmon_mbwu;
-		break;
 	default:
 		return -EINVAL;
 	}
@@ -502,16 +487,6 @@ static bool class_has_usable_mbwu(struct mpam_class *class)
 	return (mpam_partid_max > 1) || (mpam_pmg_max != 0);
 }
 
-static bool class_has_usable_impl_mbwu(struct mpam_class *class)
-{
-	struct mpam_props *cprops = &class->props;
-
-	if (!mpam_has_feature(mpam_feat_impl_msmon_mbwu, cprops))
-		return false;
-
-	return true;
-}
-
 static bool mba_class_use_mbw_part(struct mpam_props *cprops)
 {
 	/* TODO: Scaling is not yet supported */
@@ -857,10 +832,6 @@ static int mpam_resctrl_resource_init(struct mpam_resctrl_res *res)
 		if (has_mbwu && class->type == MPAM_CLASS_MEMORY) {
 			mbm_total_class = class;
 			r->mon_capable = true;
-		} else if (class_has_usable_impl_mbwu(class)) {
-			r->mon_capable = true;
-			if (mpam_current_machine == MPAM_YITIAN710)
-				mbm_bps_class = class;
 		}
 	}
 
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index 51baa0f71b65..06f660dfd929 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -790,11 +790,6 @@ static struct mon_evt mbm_local_event = {
 	.evtid		= QOS_L3_MBM_LOCAL_EVENT_ID,
 };
 
-static struct mon_evt mbm_bps_event = {
-	.name		= "mbm_local_bytes",
-	.evtid		= QOS_MC_MBM_BPS_EVENT_ID,
-};
-
 /*
  * Initialize the event list for the resource.
  *
@@ -814,14 +809,6 @@ static void l3_mon_evt_init(struct rdt_resource *r)
 		list_add_tail(&mbm_local_event.list, &r->evt_list);
 }
 
-static void mc_mon_evt_init(struct rdt_resource *r)
-{
-	INIT_LIST_HEAD(&r->evt_list);
-
-	if (resctrl_arch_is_mbm_bps_enabled())
-		list_add_tail(&mbm_bps_event.list, &r->evt_list);
-}
-
 int resctrl_mon_resource_init(void)
 {
 	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
@@ -845,9 +832,6 @@ int resctrl_mon_resource_init(void)
 		mbm_config_rftype_init("mbm_local_bytes_config");
 	}
 
-	r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-	mc_mon_evt_init(r);
-
 	return 0;
 }
 
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index e39f22453d84..ea969ddb1a9d 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -113,14 +113,13 @@ void rdt_staged_configs_clear(void)
 static bool resctrl_is_mbm_enabled(void)
 {
 	return (resctrl_arch_is_mbm_total_enabled() ||
-		resctrl_arch_is_mbm_local_enabled() ||
-		resctrl_arch_is_mbm_bps_enabled());
+		resctrl_arch_is_mbm_local_enabled());
 }
 
 static bool resctrl_is_mbm_event(int e)
 {
 	return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
-		e <= QOS_MC_MBM_BPS_EVENT_ID);
+		e <= QOS_L3_MBM_LOCAL_EVENT_ID);
 }
 
 /*
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index 660776491941..5423a2eff810 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -81,7 +81,6 @@ bool resctrl_arch_mon_capable(void);
 bool resctrl_arch_is_llc_occupancy_enabled(void);
 bool resctrl_arch_is_mbm_local_enabled(void);
 bool resctrl_arch_is_mbm_total_enabled(void);
-bool resctrl_arch_is_mbm_bps_enabled(void);
 
 /* reset cached configurations, then all devices */
 void resctrl_arch_reset_resources(void);
diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h
index a0d8694be783..fe0b10b589c0 100644
--- a/include/linux/resctrl_types.h
+++ b/include/linux/resctrl_types.h
@@ -93,9 +93,6 @@ enum resctrl_event_id {
 	QOS_L3_OCCUP_EVENT_ID		= 0x01,
 	QOS_L3_MBM_TOTAL_EVENT_ID	= 0x02,
 	QOS_L3_MBM_LOCAL_EVENT_ID	= 0x03,
-	QOS_MC_MBM_BPS_EVENT_ID		= 0x04,
 };
 
-#define RESCTRL_MAX_EVENT_NUM		4
-
 #endif /* __LINUX_RESCTRL_TYPES_H */
-- 
Gitee


From 5517057e79a0ac36230810006d9619b426d68638 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:34:53 -0800
Subject: [PATCH 048/280] anolis: Revert "anolis: arm_mpam: Add supportion for
 implementation-defined MB monitoring"

ANBZ: #31045

This reverts commit 0dcae46b4456796bb839eb313ab68c8ae82d96e5.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/acpi/arm64/mpam.c             |  4 --
 drivers/platform/mpam/mpam_devices.c  | 56 +--------------------------
 drivers/platform/mpam/mpam_internal.h |  8 ----
 3 files changed, 2 insertions(+), 66 deletions(-)

diff --git a/drivers/acpi/arm64/mpam.c b/drivers/acpi/arm64/mpam.c
index 153ef041abf0..7a4bd70972c2 100644
--- a/drivers/acpi/arm64/mpam.c
+++ b/drivers/acpi/arm64/mpam.c
@@ -22,8 +22,6 @@
 #define ACPI_MPAM_MSC_IRQ_AFFINITY_PROCESSOR_CONTAINER (1<<3)
 #define ACPI_MPAM_MSC_IRQ_AFFINITY_VALID               (1<<4)
 
-int ddrc_freq;
-
 /* Use OEM info in MPAM ACPI table to distinguish different machine types */
 struct acpi_mpam_machine_oem_info {
 	enum mpam_machine_type type;
@@ -143,8 +141,6 @@ static int acpi_mpam_parse_resource(struct mpam_msc *msc,
 		return mpam_ris_create(msc, res->ris_index, MPAM_CLASS_CACHE,
 				       level, cache_id);
 	case ACPI_MPAM_LOCATION_TYPE_MEMORY:
-		if (mpam_current_machine == MPAM_YITIAN710)
-			ddrc_freq = res->locator.memory_locator.reserved;
 		return mpam_ris_create(msc, res->ris_index, MPAM_CLASS_MEMORY,
 				       255, res->locator.memory_locator.proximity_domain);
 	default:
diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 0827f2c61f91..b6672b7881f7 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -35,8 +35,6 @@
 
 #include "mpam_internal.h"
 
-extern int ddrc_freq;
-
 /*
  * mpam_list_lock protects the SRCU lists when writing. Once the
  * mpam_enabled key is enabled these lists are read-only,
@@ -694,10 +692,6 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris)
 		}
 	}
 
-	if (FIELD_GET(MPAMF_IDR_HAS_IMPL_IDR, ris->idr))
-		if (mpam_current_machine == MPAM_YITIAN710 && class->type == MPAM_CLASS_MEMORY)
-			mpam_set_feature(mpam_feat_impl_msmon_mbwu, props);
-
 	/*
 	 * RIS with PARTID narrowing don't have enough storage for one
 	 * configuration per PARTID. If these are in a class we could use,
@@ -1021,45 +1015,6 @@ static void __ris_msmon_read(void *arg)
 	*(m->val) += now;
 }
 
-static void __ris_impl_msmon_read(void *arg)
-{
-	unsigned long flags;
-	struct mon_read *m = arg;
-	u64 mb_val = 0;
-	struct mon_cfg *ctx = m->ctx;
-	struct mpam_msc *msc = m->ris->msc;
-	u32 custom_reg_base_addr, cycle, val;
-
-	lockdep_assert_held(&msc->lock);
-	if (m->type != mpam_feat_impl_msmon_mbwu)
-		return;
-
-	/* Other machine can extend this function */
-	if (mpam_current_machine != MPAM_YITIAN710)
-		return;
-
-	spin_lock_irqsave(&msc->part_sel_lock, flags);
-
-	__mpam_write_reg(msc, MPAMCFG_PART_SEL, ctx->mon);
-
-	custom_reg_base_addr = __mpam_read_reg(msc, MPAMF_IMPL_IDR);
-
-	cycle = __mpam_read_reg(msc, custom_reg_base_addr + MPAMF_CUST_WINDW_OFFSET);
-	val = __mpam_read_reg(msc, custom_reg_base_addr + MPAMF_CUST_MBWC_OFFSET);
-
-	spin_unlock_irqrestore(&msc->part_sel_lock, flags);
-
-	if (val & MSMON___NRDY) {
-		m->err = -EBUSY;
-		return;
-	}
-
-	mb_val = MBWU_GET(val);
-
-	mb_val = mb_val * 32 * ddrc_freq * 1000000 / cycle; /* B/s */
-	*(m->val) += mb_val;
-}
-
 static int _msmon_read(struct mpam_component *comp, struct mon_read *arg)
 {
 	int err, idx;
@@ -1072,15 +1027,8 @@ static int _msmon_read(struct mpam_component *comp, struct mon_read *arg)
 
 		msc = ris->msc;
 		mutex_lock(&msc->lock);
-		if (arg->type == mpam_feat_msmon_csu ||
-		    arg->type == mpam_feat_msmon_mbwu)
-			err = smp_call_function_any(&msc->accessibility,
-					__ris_msmon_read, arg, true);
-		else if (arg->type == mpam_feat_impl_msmon_mbwu)
-			err = smp_call_function_any(&msc->accessibility,
-					__ris_impl_msmon_read, arg, true);
-		else
-			err = -EOPNOTSUPP;
+		err = smp_call_function_any(&msc->accessibility,
+					    __ris_msmon_read, arg, true);
 		mutex_unlock(&msc->lock);
 		if (!err && arg->err)
 			err = arg->err;
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index d84413e5e031..014524e5fa4f 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -108,7 +108,6 @@ enum mpam_device_features {
 	mpam_feat_msmon_mbwu_capture,
 	mpam_feat_msmon_mbwu_rwbw,
 	mpam_feat_msmon_capt,
-	mpam_feat_impl_msmon_mbwu,
 	mpam_feat_partid_nrw,
 	MPAM_FEATURE_LAST,
 };
@@ -575,11 +574,4 @@ void mpam_resctrl_exit(void);
  */
 #define MSMON_CAPT_EVNT_NOW    BIT(0)
 
-/* Used for PTG Yitian710 specific MB monitoring feature */
-#define MBWU_MASK GENMASK(23, 0)
-#define MBWU_WINWD_MAX GENMASK(22, 0)
-#define MBWU_GET(v) ((v) & MBWU_MASK)
-#define MPAMF_CUST_MBWC_OFFSET 0x08
-#define MPAMF_CUST_WINDW_OFFSET 0x0C
-
 #endif /* MPAM_INTERNAL_H */
-- 
Gitee


From cf5eaa9fcb14fdd2e195714ab84a991c1509b409 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:34:55 -0800
Subject: [PATCH 049/280] anolis: Revert "anolis: arm_mpam: Add cache msc info
 parsing for Yitian710 specific MPAM ACPI table"

ANBZ: #31045

This reverts commit c4d02e76df6c83226ba80ad65a26256d5b865b67.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/acpi/arm64/mpam.c            | 17 ++++-------------
 drivers/platform/mpam/mpam_devices.c |  6 +-----
 2 files changed, 5 insertions(+), 18 deletions(-)

diff --git a/drivers/acpi/arm64/mpam.c b/drivers/acpi/arm64/mpam.c
index 7a4bd70972c2..92ecfc614d14 100644
--- a/drivers/acpi/arm64/mpam.c
+++ b/drivers/acpi/arm64/mpam.c
@@ -124,19 +124,10 @@ static int acpi_mpam_parse_resource(struct mpam_msc *msc,
 	switch (res->locator_type) {
 	case ACPI_MPAM_LOCATION_TYPE_PROCESSOR_CACHE:
 		cache_id = res->locator.cache_locator.cache_reference;
-		if (mpam_current_machine == MPAM_YITIAN710) {
-			/*
-			 * YITIAN710's BIOS doesn't support find level from
-			 * cache id. Since it only supports L3 cache, use a
-			 * fixed value, 3.
-			 */
-			level = 3;
-		} else {
-			level = find_acpi_cache_level_from_id(cache_id);
-			if (level < 0) {
-				pr_err_once("Bad level for cache with id %u\n", cache_id);
-				return level;
-			}
+		level = find_acpi_cache_level_from_id(cache_id);
+		if (level < 0) {
+			pr_err_once("Bad level for cache with id %u\n", cache_id);
+			return level;
 		}
 		return mpam_ris_create(msc, res->ris_index, MPAM_CLASS_CACHE,
 				       level, cache_id);
diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index b6672b7881f7..3351dc9d1b1b 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -367,12 +367,8 @@ static int get_cpumask_from_cache_id(u32 cache_id, u32 cache_level,
 	int iter_cache_id;
 	struct device_node *iter;
 
-	if (!acpi_disabled) {
-		if (mpam_current_machine == MPAM_YITIAN710)
-			return acpi_pptt_get_cpumask_from_cache_id_and_level(
-					cache_id, cache_level, affinity);
+	if (!acpi_disabled)
 		return acpi_pptt_get_cpumask_from_cache_id(cache_id, affinity);
-	}
 
 	for_each_possible_cpu(cpu) {
 		iter = of_get_cpu_node(cpu, NULL);
-- 
Gitee


From 01947cd468450263f43caa94ad65a7c02ab3e0ed Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:34:57 -0800
Subject: [PATCH 050/280] anolis: Revert "anolis: ACPI / PPTT: Downgrade the
 revision requirement in acpi_pptt_get_cpumask_from_cache_id_and_level"

ANBZ: #31045

This reverts commit 02a1af8f13c84089353b3532591c9dff93a21fc3.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/acpi/pptt.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
index eea6ea5fcdca..b2249f8541e7 100644
--- a/drivers/acpi/pptt.c
+++ b/drivers/acpi/pptt.c
@@ -1173,11 +1173,7 @@ int acpi_pptt_get_cpumask_from_cache_id_and_level(u32 cache_id, u32 cache_level,
 		return -ENOENT;
 	}
 
-	/*
-	 * FIXME: Since this function does not actually use the cache id in the
-	 * PPTT table, we downgrade the revision requirement.
-	 */
-	if (table->revision < 2) {
+	if (table->revision < 3) {
 		acpi_put_table(table);
 		return -ENOENT;
 	}
-- 
Gitee


From 75e304e321810d7ead8649aa05cfa9d5aba477be Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:34:59 -0800
Subject: [PATCH 051/280] anolis: Revert "anolis: ACPI / PPTT: Add a helper to
 fill a cpumask from a cache with specific id and level"

ANBZ: #31045

This reverts commit 23cc2060897f188f5cd0f9f3843eca0046a43794.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/acpi/pptt.c  | 60 --------------------------------------------
 include/linux/acpi.h |  8 ------
 2 files changed, 68 deletions(-)

diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
index b2249f8541e7..fb3bd2eaa7e8 100644
--- a/drivers/acpi/pptt.c
+++ b/drivers/acpi/pptt.c
@@ -1139,63 +1139,3 @@ int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id, cpumask_t *cpus)
 	acpi_put_table(table);
 	return 0;
 }
-
-/**
- * acpi_pptt_get_cpumask_from_cache_id_and_level() - Get the cpus associated with the
- *						     cache specified by id and level
- * @cache_id: The id field of the unified cache
- * @cache_level: The level of the unified cache
- * @cpus: Where to buidl the cpumask
- *
- * Determine which CPUs are below this cache in the PPTT. This allows the property
- * to be found even if the CPUs are offline.
- *
- * The PPTT table must be rev 3 or later,
- *
- * Return: -ENOENT if the PPTT doesn't exist, or the cache cannot be found.
- * Otherwise returns 0 and sets the cpus in the provided cpumask.
- */
-int acpi_pptt_get_cpumask_from_cache_id_and_level(u32 cache_id, u32 cache_level,
-						  cpumask_t *cpus)
-{
-	u32 acpi_cpu_id;
-	acpi_status status;
-	int cpu;
-	struct acpi_table_header *table;
-	struct acpi_pptt_cache *cache_node;
-	struct acpi_pptt_processor *cpu_node;
-
-	cpumask_clear(cpus);
-
-	status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
-	if (ACPI_FAILURE(status)) {
-		acpi_pptt_warn_missing();
-		return -ENOENT;
-	}
-
-	if (table->revision < 3) {
-		acpi_put_table(table);
-		return -ENOENT;
-	}
-
-	for_each_possible_cpu(cpu) {
-		acpi_cpu_id = get_acpi_id_for_cpu(cpu);
-		cpu_node = acpi_find_processor_node(table, acpi_cpu_id);
-		if (!cpu_node)
-			continue;
-
-		cache_node = acpi_find_cache_node(table, acpi_cpu_id,
-						  ACPI_PPTT_CACHE_TYPE_UNIFIED,
-						  cache_level, &cpu_node);
-
-		if (!cache_node)
-			continue;
-
-		cpu_node = acpi_pptt_find_cache_backwards(table, cache_node);
-		if (cpu_node->acpi_processor_id == cache_id)
-			cpumask_set_cpu(cpu, cpus);
-	}
-
-	acpi_put_table(table);
-	return 0;
-}
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index b339abbfa2a4..f154c5768e2b 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1496,8 +1496,6 @@ int find_acpi_cpu_topology_hetero_id(unsigned int cpu);
 int find_acpi_cache_level_from_id(u32 cache_id);
 int acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id, cpumask_t *cpus);
 int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id, cpumask_t *cpus);
-int acpi_pptt_get_cpumask_from_cache_id_and_level(u32 cache_id, u32 cache_level,
-						  cpumask_t *cpus);
 #else
 static inline int acpi_pptt_cpu_is_thread(unsigned int cpu)
 {
@@ -1533,12 +1531,6 @@ static inline int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id,
 {
 	return -EINVAL;
 }
-static inline int acpi_pptt_get_cpumask_from_cache_id_and_level(u32 cache_id,
-								u32 cache_level,
-								cpumask_t *cpus)
-{
-	return -EINVAL;
-}
 #endif
 
 #ifdef CONFIG_ARM64
-- 
Gitee


From 837786f48ae38e6f33f8769f937149401a53526b Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:35:02 -0800
Subject: [PATCH 052/280] anolis: Revert "openEuler: ACPI / PPTT: Filthy hack
 to find _a_ backwards reference in the PPTT [ROTTEN]"

ANBZ: #31045

This reverts commit 1b633f23c3e58daf21dccdf2486881304e95c115.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/acpi/pptt.c  | 48 --------------------------------------------
 include/linux/acpi.h |  4 ----
 2 files changed, 52 deletions(-)

diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
index fb3bd2eaa7e8..f5dcabdc99c9 100644
--- a/drivers/acpi/pptt.c
+++ b/drivers/acpi/pptt.c
@@ -301,54 +301,6 @@ static struct acpi_pptt_processor *acpi_find_processor_node(struct acpi_table_he
 	return NULL;
 }
 
-/*
- * acpi_pptt_find_cache_backwards() - Given a PPTT cache find a processor node
- * that points to it. This lets us find a cacheinfo node by fw_token, but
- * is totally broken as many processor node may point at the same PPTT
- * cache indicating different instances of the cache. (e.g. all the L1
- * caches are the same shape, but they aren't the same cache).
- * This only works if you cooked your PPTT table to look like this.
- */
-struct acpi_pptt_processor *
-acpi_pptt_find_cache_backwards(struct acpi_table_header *table_hdr,
-			       struct acpi_pptt_cache *cache)
-{
-	struct acpi_pptt_processor *cpu_node;
-	struct acpi_subtable_header *entry;
-	struct acpi_subtable_header *res;
-	unsigned long table_end;
-	u32 proc_sz;
-	int i;
-
-	table_end = (unsigned long)table_hdr + table_hdr->length;
-	entry = ACPI_ADD_PTR(struct acpi_subtable_header, table_hdr,
-			     sizeof(struct acpi_table_pptt));
-	proc_sz = sizeof(struct acpi_pptt_processor *);
-
-	/* find the processor structure which points at  with this cpuid */
-	while ((unsigned long)entry + proc_sz < table_end) {
-		if (entry->length == 0) {
-			pr_warn("Invalid zero length subtable\n");
-			break;
-		}
-
-		cpu_node = (struct acpi_pptt_processor *)entry;
-		entry = ACPI_ADD_PTR(struct acpi_subtable_header, entry,
-				     entry->length);
-
-		if (cpu_node->header.type != ACPI_PPTT_TYPE_PROCESSOR)
-			continue;
-
-		for (i = 0; i < cpu_node->number_of_priv_resources; i++) {
-			res = acpi_get_pptt_resource(table_hdr, cpu_node, i);
-			if (&cache->header == res)
-				return cpu_node;
-		}
-	}
-
-	return NULL;
-}
-
 /* parent_node points into the table, but the table isn't provided. */
 static void acpi_pptt_get_child_cpus(struct acpi_pptt_processor *parent_node,
 				     cpumask_t *cpus)
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index f154c5768e2b..0ef4b9427e99 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1569,8 +1569,4 @@ static inline void acpi_device_notify(struct device *dev) { }
 static inline void acpi_device_notify_remove(struct device *dev) { }
 #endif
 
-struct acpi_pptt_processor *
-acpi_pptt_find_cache_backwards(struct acpi_table_header *table_hdr,
-			       struct acpi_pptt_cache *cache);
-
 #endif	/*_LINUX_ACPI_H*/
-- 
Gitee


From ffaccb70e510599b411c626999827e79b4d0563c Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:35:04 -0800
Subject: [PATCH 053/280] anolis: Revert "anolis: arm_mpam: Identify different
 types of machines for MPAM implementation specific features"

ANBZ: #31045

This reverts commit e7713cbc2aff4677eef0dd32f59fe5a7e6fec691.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/acpi/arm64/mpam.c            | 67 +---------------------------
 drivers/platform/mpam/mpam_devices.c | 13 ------
 include/linux/arm_mpam.h             | 15 -------
 3 files changed, 2 insertions(+), 93 deletions(-)

diff --git a/drivers/acpi/arm64/mpam.c b/drivers/acpi/arm64/mpam.c
index 92ecfc614d14..c1f9cafaf1e2 100644
--- a/drivers/acpi/arm64/mpam.c
+++ b/drivers/acpi/arm64/mpam.c
@@ -22,26 +22,6 @@
 #define ACPI_MPAM_MSC_IRQ_AFFINITY_PROCESSOR_CONTAINER (1<<3)
 #define ACPI_MPAM_MSC_IRQ_AFFINITY_VALID               (1<<4)
 
-/* Use OEM info in MPAM ACPI table to distinguish different machine types */
-struct acpi_mpam_machine_oem_info {
-	enum mpam_machine_type type;
-	char signature[ACPI_NAMESEG_SIZE + 1];
-	u8 revision;
-	char oem_id[ACPI_OEM_ID_SIZE + 1];
-	char oem_table_id[ACPI_OEM_TABLE_ID_SIZE + 1];
-	u32 oem_revision;
-};
-
-static struct acpi_mpam_machine_oem_info acpi_mpam_machines[MPAM_NUM_MACHINE_TYPES] = {
-	[MPAM_YITIAN710] = {
-		.signature = "YMPM",
-		.revision = 0,
-		.oem_id = "PTG   ",
-		.oem_table_id = "PTG01   ",
-		.oem_revision = 0,
-	},
-};
-
 static bool frob_irq(struct platform_device *pdev, int intid, u32 flags,
 		     int *irq, u32 processor_container_uid)
 {
@@ -317,34 +297,18 @@ static int __init _parse_table(struct acpi_table_header *table)
 static struct acpi_table_header *get_table(void)
 {
 	struct acpi_table_header *table;
-	enum mpam_machine_type mtype;
 	acpi_status status;
 
 	if (acpi_disabled || !mpam_cpus_have_feature())
 		return NULL;
 
-	mtype = acpi_mpam_get_machine_type();
-
-	if (mtype != MPAM_DEFAULT_MACHINE)
-		status = acpi_get_table(acpi_mpam_machines[mtype].signature, 0, &table);
-	else
-		status = acpi_get_table(ACPI_SIG_MPAM, 0, &table);
+	status = acpi_get_table(ACPI_SIG_MPAM, 0, &table);
 	if (ACPI_FAILURE(status))
 		return NULL;
 
-	if (mtype == MPAM_DEFAULT_MACHINE && table->revision != 1)
+	if (table->revision != 1)
 		return NULL;
 
-	/*
-	 * Kunpeng's MPAM ACPI adopts an older version of MPAM ACPI, so
-	 * this MPAM ACPI driver is not suitable for Kunpeng platform.
-	 * Skip it.
-	 */
-	if (!strncmp(table->oem_id, "HISI", 4)) {
-		acpi_put_table(table);
-		return NULL;
-	}
-
 	return table;
 }
 
@@ -403,33 +367,6 @@ int acpi_mpam_count_msc(void)
 	return ret;
 }
 
-enum mpam_machine_type acpi_mpam_get_machine_type(void)
-{
-	struct acpi_table_header *table;
-	enum mpam_machine_type ret;
-	acpi_status status;
-	int i;
-
-	ret = MPAM_DEFAULT_MACHINE;
-
-	for (i = MPAM_DEFAULT_MACHINE + 1; i < MPAM_NUM_MACHINE_TYPES; i++) {
-		status = acpi_get_table(acpi_mpam_machines[i].signature, 0, &table);
-		if (ACPI_FAILURE(status))
-			continue;
-
-		if (!memcmp(acpi_mpam_machines[i].oem_id, table->oem_id, ACPI_OEM_ID_SIZE) &&
-		    !memcmp(acpi_mpam_machines[i].oem_table_id, table->oem_table_id,
-		    ACPI_OEM_TABLE_ID_SIZE) &&
-		    acpi_mpam_machines[i].oem_revision == table->oem_revision) {
-			ret = i;
-		}
-
-		acpi_put_table(table);
-	}
-
-	return ret;
-}
-
 /*
  * Call after ACPI devices have been created, which happens behind acpi_scan_init()
  * called from subsys_initcall(). PCC requires the mailbox driver, which is
diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 3351dc9d1b1b..e22540111d5b 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -45,8 +45,6 @@ static LIST_HEAD(mpam_all_msc);
 
 struct srcu_struct mpam_srcu;
 
-enum mpam_machine_type mpam_current_machine;
-
 /* MPAM isn't available until all the MSC have been probed. */
 static u32 mpam_num_msc;
 
@@ -1563,12 +1561,6 @@ static int mpam_msc_setup_error_irq(struct mpam_msc *msc)
 	return 0;
 }
 
-static enum mpam_machine_type mpam_dt_get_machine_type(void)
-{
-	/* FIXME: not supported yet */
-	return MPAM_DEFAULT_MACHINE;
-}
-
 static int mpam_dt_count_msc(void)
 {
 	int count = 0;
@@ -2394,11 +2386,6 @@ static int __init mpam_msc_driver_init(void)
 
 	init_srcu_struct(&mpam_srcu);
 
-	if (!acpi_disabled)
-		mpam_current_machine = acpi_mpam_get_machine_type();
-	else
-		mpam_current_machine = mpam_dt_get_machine_type();
-
 	/*
 	 * If the MPAM CPU interface is not implemented, or reserved by
 	 * firmware, there is no point touching the rest of the hardware.
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index 5423a2eff810..239d27af9e32 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -31,22 +31,11 @@ enum mpam_class_types {
 	MPAM_CLASS_UNKNOWN,     /* Everything else, e.g. SMMU */
 };
 
-enum mpam_machine_type {
-	MPAM_DEFAULT_MACHINE,
-	MPAM_YITIAN710,
-
-	MPAM_NUM_MACHINE_TYPES,
-};
-
-/* Machine identifier which can be used for vendor-specific MPAM features */
-extern enum mpam_machine_type mpam_current_machine;
-
 #ifdef CONFIG_ACPI_MPAM
 /* Parse the ACPI description of resources entries for this MSC. */
 int acpi_mpam_parse_resources(struct mpam_msc *msc,
 			      struct acpi_mpam_msc_node *tbl_msc);
 int acpi_mpam_count_msc(void);
-enum mpam_machine_type acpi_mpam_get_machine_type(void);
 #else
 static inline int acpi_mpam_parse_resources(struct mpam_msc *msc,
 					    struct acpi_mpam_msc_node *tbl_msc)
@@ -54,10 +43,6 @@ static inline int acpi_mpam_parse_resources(struct mpam_msc *msc,
 	return -EINVAL;
 }
 static inline int acpi_mpam_count_msc(void) { return -EINVAL; }
-static inline enum mpam_machine_type acpi_mpam_get_machine_type(void)
-{
-	return MPAM_DEFAULT_MACHINE;
-}
 #endif
 
 int mpam_register_requestor(u16 partid_max, u8 pmg_max);
-- 
Gitee


From 646dda9a8fb42c2572dc382232008cccd99dfef9 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:35:06 -0800
Subject: [PATCH 054/280] anolis: Revert "anolis: ACPI / MPAM: Avoid MPAM MSC
 has the same identifier"

ANBZ: #31045

This reverts commit 33159b9601a649bdddf80589593324f5cd24f554.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/acpi/arm64/mpam.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/acpi/arm64/mpam.c b/drivers/acpi/arm64/mpam.c
index c1f9cafaf1e2..8a63449f27b5 100644
--- a/drivers/acpi/arm64/mpam.c
+++ b/drivers/acpi/arm64/mpam.c
@@ -194,7 +194,6 @@ static int __init _parse_table(struct acpi_table_header *table)
 	struct resource res[3];
 	char uid[16];
 	u32 acpi_id;
-	int msc_num = 0;
 
 	table_end = (char *)table + table->length;
 
@@ -221,12 +220,7 @@ static int __init _parse_table(struct acpi_table_header *table)
 		memset(res, 0, sizeof(res));
 		memset(props, 0, sizeof(props));
 
-		/*
-		 * Use an extra msc_num instead of msc->identifier, since MSC
-		 * nodes with different types in MPAM ACPI table may have the
-		 * same id value.
-		 */
-		pdev = platform_device_alloc("mpam_msc", msc_num++);
+		pdev = platform_device_alloc("mpam_msc", tbl_msc->identifier);
 		if (IS_ERR(pdev)) {
 			err = PTR_ERR(pdev);
 			break;
-- 
Gitee


From 5ef125385141dc166dfed81230ee5fc4e9e51daf Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:35:08 -0800
Subject: [PATCH 055/280] anolis: Revert "anolis: arm_mpam: Fix the wrong
 checking when using USE_RMID_IDX"

ANBZ: #31045

This reverts commit c0657014dd6277a985a06e3cf7152a65339d070e.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 25cf64386b64..bc26aaeebc76 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -359,10 +359,9 @@ int resctrl_arch_rmid_read(struct rdt_resource	*r, struct rdt_domain *d,
 		return -EINVAL;
 	}
 
-	if (mon == USE_RMID_IDX)
+	cfg.mon = mon;
+	if (cfg.mon == USE_RMID_IDX)
 		cfg.mon = resctrl_arch_rmid_idx_encode(closid, rmid);
-	else
-		cfg.mon = mon;
 
 	cfg.match_pmg = true;
 	cfg.pmg = rmid;
-- 
Gitee


From cba41f14c62fad8fb82bf08accf0fdfe5c9cf272 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:35:10 -0800
Subject: [PATCH 056/280] anolis: Revert "anolis: arm_mpam: Fix schemata's
 display error of MB when CDP is enabled"

ANBZ: #31045

This reverts commit a0a192b425a20f543157ffcafa6995e8cd5d43da.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index bc26aaeebc76..06af2d77b93e 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -931,10 +931,7 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
 	dom = container_of(d, struct mpam_resctrl_dom, resctrl_dom);
 	cprops = &res->class->props;
 
-	if (mpam_resctrl_hide_cdp(r->rid))
-		partid = resctrl_get_config_index(closid, CDP_CODE);
-	else
-		partid = resctrl_get_config_index(closid, type);
+	partid = resctrl_get_config_index(closid, type);
 	cfg = &dom->comp->cfg[partid];
 
 	switch (r->rid) {
-- 
Gitee


From 18f61de41ae365c61aadc21b969096ab74bdcb47 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:35:12 -0800
Subject: [PATCH 057/280] anolis: Revert "anolis: arm_mpam: Fix the wrong
 PARTID_MAX and PMG_MAX usage"

ANBZ: #31045

This reverts commit 511767ff9e959b064dcfbc1089c390143e34da84.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index e22540111d5b..ad641f21d301 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -1240,7 +1240,7 @@ static int mpam_reprogram_ris(void *_arg)
 	spin_lock(&partid_max_lock);
 	partid_max = mpam_partid_max;
 	spin_unlock(&partid_max_lock);
-	for (partid = 0; partid <= partid_max; partid++)
+	for (partid = 0; partid < partid_max; partid++)
 		mpam_reprogram_ris_partid(ris, partid, cfg);
 
 	return 0;
@@ -1396,7 +1396,7 @@ static void mpam_reprogram_msc(struct mpam_msc *msc)
 		}
 
 		reset = true;
-		for (partid = 0; partid <= mpam_partid_max; partid++) {
+		for (partid = 0; partid < mpam_partid_max; partid++) {
 			cfg = &ris->comp->cfg[partid];
 			if (cfg->features)
 				reset = false;
@@ -2119,7 +2119,7 @@ static int __allocate_component_cfg(struct mpam_component *comp)
 	if (comp->cfg)
 		return 0;
 
-	comp->cfg = kcalloc(mpam_partid_max + 1, sizeof(*comp->cfg), GFP_KERNEL);
+	comp->cfg = kcalloc(mpam_partid_max, sizeof(*comp->cfg), GFP_KERNEL);
 	if (!comp->cfg)
 		return -ENOMEM;
 
@@ -2220,7 +2220,7 @@ static void mpam_enable_once(void)
 	mpam_register_cpuhp_callbacks(mpam_cpu_online);
 
 	pr_info("MPAM enabled with %u partid and %u pmg\n",
-		READ_ONCE(mpam_partid_max) + 1, READ_ONCE(mpam_pmg_max) + 1);
+		READ_ONCE(mpam_partid_max) + 1, mpam_pmg_max + 1);
 }
 
 void mpam_reset_class(struct mpam_class *class)
@@ -2231,7 +2231,7 @@ void mpam_reset_class(struct mpam_class *class)
 
 	idx = srcu_read_lock(&mpam_srcu);
 	list_for_each_entry_rcu(comp, &class->components, class_list) {
-		memset(comp->cfg, 0, ((mpam_partid_max + 1) * sizeof(*comp->cfg)));
+		memset(comp->cfg, 0, (mpam_partid_max * sizeof(*comp->cfg)));
 
 		list_for_each_entry_rcu(ris, &comp->ris, comp_list) {
 			mutex_lock(&ris->msc->lock);
-- 
Gitee


From 6f1f51a2efa69b1f8a8dc88704e029d09fde5a75 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:35:14 -0800
Subject: [PATCH 058/280] anolis: Revert "anolis: arm_mpam: Fix wrong MMIO
 space size for msc platform device"

ANBZ: #31045

This reverts commit 128e377542b0b62f6537832a0053fdb2cc9a0384.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 7 +------
 drivers/platform/mpam/mpam_internal.h | 1 -
 2 files changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index ad641f21d301..12015951a63d 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -1769,13 +1769,8 @@ static int mpam_msc_drv_probe(struct platform_device *pdev)
 				err = PTR_ERR(io);
 				break;
 			}
-			msc->mapped_hwpage_sz = msc_res->end - msc_res->start + 1;
+			msc->mapped_hwpage_sz = msc_res->end - msc_res->start;
 			msc->mapped_hwpage = io;
-			if (msc->mapped_hwpage_sz < MPAM_MIN_MMIO_SIZE) {
-				pr_err("MSC MMIO space size is too small\n");
-				err = -EINVAL;
-				break;
-			}
 		} else if (msc->iface == MPAM_IFACE_PCC) {
 			msc->pcc_cl.dev = &pdev->dev;
 			msc->pcc_cl.rx_callback = mpam_pcc_rx_callback;
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index 014524e5fa4f..48554ff93e09 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -321,7 +321,6 @@ void mpam_resctrl_exit(void);
  * Partitioning and Monitoring (MPAM), for Armv8-A. DDI 0598A.a
  */
 #define MPAM_ARCHITECTURE_V1    0x10
-#define MPAM_MIN_MMIO_SIZE      0x3000
 
 /* Memory mapped control pages: */
 /* ID Register offsets in the memory mapped page */
-- 
Gitee


From e842a882c9d15b5bfb7dedec1686902495f2dbea Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:35:15 -0800
Subject: [PATCH 059/280] anolis: Revert "anolis: arm_mpam: Clear mpam_msc
 properly when driver probing failed"

ANBZ: #31045

This reverts commit 7d0219e6e108fbe8ca4bfba820231894742181b5.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c | 43 ++++++++++++++--------------
 1 file changed, 22 insertions(+), 21 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 12015951a63d..f5f23725d13a 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -1688,24 +1688,6 @@ static void mpam_pcc_rx_callback(struct mbox_client *cl, void *msg)
 	/* TODO: wake up tasks blocked on this MSC's PCC channel */
 }
 
-static int mpam_msc_drv_remove(struct platform_device *pdev)
-{
-	struct mpam_msc *msc = platform_get_drvdata(pdev);
-
-	if (!msc)
-		return 0;
-
-	mutex_lock(&mpam_list_lock);
-	mpam_num_msc--;
-	platform_set_drvdata(pdev, NULL);
-	list_del_rcu(&msc->glbl_list);
-	mpam_msc_destroy(msc);
-	synchronize_srcu(&mpam_srcu);
-	mutex_unlock(&mpam_list_lock);
-
-	return 0;
-}
-
 static int mpam_msc_drv_probe(struct platform_device *pdev)
 {
 	int err;
@@ -1751,6 +1733,7 @@ static int mpam_msc_drv_probe(struct platform_device *pdev)
 
 		err = mpam_msc_setup_error_irq(msc);
 		if (err) {
+			devm_kfree(&pdev->dev, msc);
 			msc = ERR_PTR(err);
 			break;
 		}
@@ -1766,6 +1749,7 @@ static int mpam_msc_drv_probe(struct platform_device *pdev)
 								    &msc_res);
 			if (IS_ERR(io)) {
 				pr_err("Failed to map MSC base address\n");
+				devm_kfree(&pdev->dev, msc);
 				err = PTR_ERR(io);
 				break;
 			}
@@ -1782,6 +1766,7 @@ static int mpam_msc_drv_probe(struct platform_device *pdev)
 								 msc->pcc_subspace_id);
 			if (IS_ERR(msc->pcc_chan)) {
 				pr_err("Failed to request MSC PCC channel\n");
+				devm_kfree(&pdev->dev, msc);
 				err = PTR_ERR(msc->pcc_chan);
 				break;
 			}
@@ -1792,6 +1777,7 @@ static int mpam_msc_drv_probe(struct platform_device *pdev)
 			if (IS_ERR(io)) {
 				pr_err("Failed to map MSC base address\n");
 				pcc_mbox_free_channel(msc->pcc_chan);
+				devm_kfree(&pdev->dev, msc);
 				err = PTR_ERR(io);
 				break;
 			}
@@ -1815,9 +1801,6 @@ static int mpam_msc_drv_probe(struct platform_device *pdev)
 			err = mpam_dt_parse_resources(msc, plat_data);
 	}
 
-	if (err)
-		mpam_msc_drv_remove(pdev);
-
 	if (!err && fw_num_msc == mpam_num_msc)
 		mpam_register_cpuhp_callbacks(&mpam_discovery_cpu_online);
 
@@ -2294,6 +2277,24 @@ void mpam_enable(struct work_struct *work)
 		mpam_enable_once();
 }
 
+static int mpam_msc_drv_remove(struct platform_device *pdev)
+{
+	struct mpam_msc *msc = platform_get_drvdata(pdev);
+
+	if (!msc)
+		return 0;
+
+	mutex_lock(&mpam_list_lock);
+	mpam_num_msc--;
+	platform_set_drvdata(pdev, NULL);
+	list_del_rcu(&msc->glbl_list);
+	mpam_msc_destroy(msc);
+	synchronize_srcu(&mpam_srcu);
+	mutex_unlock(&mpam_list_lock);
+
+	return 0;
+}
+
 struct mpam_write_config_arg {
 	struct mpam_msc_ris *ris;
 	struct mpam_component *comp;
-- 
Gitee


From d1084f7e71870dc616abea08aa797fb694fb2aa7 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:35:17 -0800
Subject: [PATCH 060/280] anolis: Revert "anolis: arm_mpam: Fix the problem
 that error interrupt handling cannot exit normally"

ANBZ: #31045

This reverts commit f09dc5fedc1f38963d0ef3ba34a559efe218aedf.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c | 33 ++++++++++++++++++----------
 1 file changed, 21 insertions(+), 12 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index f5f23725d13a..32532a918115 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -1964,15 +1964,13 @@ static irqreturn_t __mpam_irq_handler(int irq, struct mpam_msc *msc)
 	pr_err("error irq from msc:%u '%s', partid:%u, pmg: %u, ris: %u\n",
 	       msc->id, mpam_errcode_names[errcode], partid, pmg, ris);
 
-	/*
-	 * To prevent this interrupt from repeatedly cancelling the scheduled
-	 * work to disable mpam, disable the error interrupt.
-	 */
-	mpam_disable_msc_ecr(msc);
-
-	schedule_work(&mpam_broken_work);
+	if (irq_is_percpu(irq)) {
+		mpam_disable_msc_ecr(msc);
+		schedule_work(&mpam_broken_work);
+		return IRQ_HANDLED;
+	}
 
-	return IRQ_HANDLED;
+	return IRQ_WAKE_THREAD;
 }
 
 static irqreturn_t mpam_ppi_handler(int irq, void *dev_id)
@@ -1989,6 +1987,8 @@ static irqreturn_t mpam_spi_handler(int irq, void *dev_id)
 	return __mpam_irq_handler(irq, msc);
 }
 
+static irqreturn_t mpam_disable_thread(int irq, void *dev_id);
+
 static int mpam_register_irqs(void)
 {
 	int err, irq;
@@ -2018,9 +2018,11 @@ static int mpam_register_irqs(void)
 					       true);
 			mutex_unlock(&msc->lock);
 		} else {
-			err = devm_request_irq(&msc->pdev->dev, irq,
-					       &mpam_spi_handler, IRQF_SHARED,
-					       "mpam:msc:error", msc);
+			err = devm_request_threaded_irq(&msc->pdev->dev, irq,
+							&mpam_spi_handler,
+							&mpam_disable_thread,
+							IRQF_SHARED,
+							"mpam:msc:error", msc);
 			if (err)
 				return err;
 		}
@@ -2226,7 +2228,7 @@ void mpam_reset_class(struct mpam_class *class)
  * All of MPAMs errors indicate a software bug, restore any modified
  * controls to their reset values.
  */
-void mpam_disable(struct work_struct *ignored)
+static irqreturn_t mpam_disable_thread(int irq, void *dev_id)
 {
 	int idx;
 	struct mpam_class *class;
@@ -2248,6 +2250,13 @@ void mpam_disable(struct work_struct *ignored)
 	list_for_each_entry_rcu(class, &mpam_classes, classes_list)
 		mpam_reset_class(class);
 	srcu_read_unlock(&mpam_srcu, idx);
+
+	return IRQ_HANDLED;
+}
+
+void mpam_disable(struct work_struct *ignored)
+{
+	mpam_disable_thread(0, NULL);
 }
 
 /*
-- 
Gitee


From 1d29828b91321f64c45c20b978333b56427c620d Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:35:19 -0800
Subject: [PATCH 061/280] anolis: Revert "anolis: arm_mpam: Limit MB percentage
 in schemata to multiples of granularity"

ANBZ: #31045

This reverts commit dd0e78b2f117bab5f9c3d339b8e8a2b18f61dee4.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 06af2d77b93e..c53b89557b4d 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -568,17 +568,11 @@ static u32 percent_to_mbw_pbm(u8 pc, struct mpam_props *cprops)
 static u16 percent_to_mbw_max(u8 pc, struct mpam_props *cprops)
 {
 	u8 bit;
-	u32 granularity, pc_ls, divisor = 2, value = 0;
+	u32 pc_ls, divisor = 2, value = 0;
 
 	if (WARN_ON_ONCE(cprops->bwa_wd > 15))
 		return MAX_MBA_BW;
 
-	/* Set the pc value to be a multiple of granularity. */
-	granularity = get_mba_granularity(cprops);
-	pc = roundup(pc, (u8) granularity);
-	if (pc > 100)
-		pc = 100;
-
 	/*
 	 * Left shift by 16 bits to preserve the precision of the division
 	 * operation.
@@ -817,7 +811,6 @@ static int mpam_resctrl_resource_init(struct mpam_resctrl_res *res)
 		r->membw.delay_linear = true;
 		r->membw.throttle_mode = THREAD_THROTTLE_UNDEFINED;
 		r->membw.bw_gran = get_mba_granularity(cprops);
-		r->membw.min_bw = r->membw.bw_gran;
 
 		/* Round up to at least 1% */
 		if (!r->membw.bw_gran)
-- 
Gitee


From 110a1de6bf598c338f2fb9bc829eeb024101dae9 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:35:21 -0800
Subject: [PATCH 062/280] anolis: Revert "anolis: arm_mpam: Fix the inaccurate
 MB granularity in resctrl info directory"

ANBZ: #31045

This reverts commit 7d467ea9850508dcac2896dc771745c759f26368.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index c53b89557b4d..dfecac759f41 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -515,7 +515,7 @@ static u32 get_mba_granularity(struct mpam_props *cprops)
 		 * bwa_wd is the number of bits implemented in the 0.xxx
 		 * fixed point fraction. 1 bit is 50%, 2 is 25% etc.
 		 */
-		return max_t(u32, 1, (MAX_MBA_BW / BIT(cprops->bwa_wd)));
+		return MAX_MBA_BW / (cprops->bwa_wd + 1);
 	}
 
 	return 0;
-- 
Gitee


From e642be11d3334ce2b7a57102859d1e128a87668a Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:35:23 -0800
Subject: [PATCH 063/280] anolis: Revert "anolis: arm_mpam: Fix MB default
 percentage error in schemata"

ANBZ: #31045

This reverts commit 41d4ab4cfb5c91c33d04d08b9ba6b50ea1dce5f9.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c | 25 ++++++-------------------
 1 file changed, 6 insertions(+), 19 deletions(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index dfecac759f41..41ae848b6f61 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -539,17 +539,10 @@ static u32 mbw_max_to_percent(u16 mbw_max, struct mpam_props *cprops)
 
 	for (bit = 15; bit; bit--) {
 		if (mbw_max & BIT(bit))
-			/*
-			 * Left shift by 16 bits to preserve the precision of
-			 * the division operation.
-			 */
-			value += (MAX_MBA_BW << 16) / divisor;
+			value += MAX_MBA_BW / divisor;
 		divisor <<= 1;
 	}
 
-	/* Use the upper bound of the fixed-point fraction. */
-	value = (value + (MAX_MBA_BW << (16 - cprops->bwa_wd))) >> 16;
-
 	return value;
 }
 
@@ -568,29 +561,23 @@ static u32 percent_to_mbw_pbm(u8 pc, struct mpam_props *cprops)
 static u16 percent_to_mbw_max(u8 pc, struct mpam_props *cprops)
 {
 	u8 bit;
-	u32 pc_ls, divisor = 2, value = 0;
+	u32 divisor = 2, value = 0;
 
 	if (WARN_ON_ONCE(cprops->bwa_wd > 15))
 		return MAX_MBA_BW;
 
-	/*
-	 * Left shift by 16 bits to preserve the precision of the division
-	 * operation.
-	 */
-	pc_ls = (u32) pc << 16;
-
 	for (bit = 15; bit; bit--) {
-		if (pc_ls >= (MAX_MBA_BW << 16) / divisor) {
-			pc_ls -= (MAX_MBA_BW << 16) / divisor;
+		if (pc >= MAX_MBA_BW / divisor) {
+			pc -= MAX_MBA_BW / divisor;
 			value |= BIT(bit);
 		}
 		divisor <<= 1;
 
-		if (!pc_ls || !((MAX_MBA_BW << 16) / divisor))
+		if (!pc || !(MAX_MBA_BW / divisor))
 			break;
 	}
 
-	value &= GENMASK(15, 15 - cprops->bwa_wd + 1);
+	value &= GENMASK(15, 15 - cprops->bwa_wd);
 
 	return value;
 }
-- 
Gitee


From d09b80e3248b4c0149e5c575671569152bf32f9c Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:35:25 -0800
Subject: [PATCH 064/280] anolis: Revert "anolis: arm_mpam: Remove the zero
 padding for MB percentage showing in schemata"

ANBZ: #31045

This reverts commit 2314db153a5ab4e4fad16c14b9e869f9cff2b16d.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 41ae848b6f61..6d25e98a757d 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -790,7 +790,7 @@ static int mpam_resctrl_resource_init(struct mpam_resctrl_res *res)
 		struct mpam_props *cprops = &class->props;
 
 		/* TODO: kill these properties off as they are derivatives */
-		r->format_str = "%d=%*u";
+		r->format_str = "%d=%0*u";
 		r->fflags = RFTYPE_RES_MB;
 		r->default_ctrl = MAX_MBA_BW;
 		r->data_width = 3;
-- 
Gitee


From fa39309a21eeb8db5465207ce7bb51bfaea2fce4 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:35:27 -0800
Subject: [PATCH 065/280] anolis: Revert "anolis: arm_mpam: Fix L3 cache size
 display error in resctrl fs"

ANBZ: #31045

This reverts commit dd301f435dbeb6eaace9eab33041f1090b0b10f0.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 6d25e98a757d..c7ebb4d37b47 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -739,8 +739,6 @@ static int mpam_resctrl_resource_init(struct mpam_resctrl_res *res)
 	    res->resctrl_res.rid == RDT_RESOURCE_L3) {
 		bool has_csu = cache_has_usable_csu(class);
 
-		r->cache_level = class->level;
-
 		/* TODO: Scaling is not yet supported */
 		r->cache.cbm_len = class->props.cpbm_wd;
 		r->cache.arch_has_sparse_bitmasks = true;
-- 
Gitee


From dcd9130a3f69ab6cdb127ad7cda6083aa6fe3569 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:42:38 -0800
Subject: [PATCH 066/280] anolis: Revert mpam part of "anolis: configs: adjust
 some driver related kconfigs"

ANBZ: #31045

This revert mpam part of dc397c48d11ee3901d0c4d86f4c497fd6728a8ea

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 anolis/configs/L2-OPTIONAL/arm64/CONFIG_ACPI_MPAM | 1 -
 1 file changed, 1 deletion(-)
 delete mode 100644 anolis/configs/L2-OPTIONAL/arm64/CONFIG_ACPI_MPAM

diff --git a/anolis/configs/L2-OPTIONAL/arm64/CONFIG_ACPI_MPAM b/anolis/configs/L2-OPTIONAL/arm64/CONFIG_ACPI_MPAM
deleted file mode 100644
index e93cbd36cedc..000000000000
--- a/anolis/configs/L2-OPTIONAL/arm64/CONFIG_ACPI_MPAM
+++ /dev/null
@@ -1 +0,0 @@
-CONFIG_ACPI_MPAM=y
-- 
Gitee


From 2c135e436b84d2c7611894ebf67a598fb5ba2aa8 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:51 -0800
Subject: [PATCH 067/280] anolis: Revert "fs/resctrl: Remove the limit on the
 number of CLOSID"

ANBZ: #31045

This reverts commit 0c5b924b71f0ff9fd8c67d4b5a43cbf016729724.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c |  2 +-
 fs/resctrl/rdtgroup.c                | 25 ++++++++++++-------------
 include/linux/resctrl.h              |  5 +++++
 3 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index c7ebb4d37b47..4062c0f93f85 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -132,7 +132,7 @@ static bool mpam_resctrl_hide_cdp(enum resctrl_res_level rid)
  */
 u32 resctrl_arch_get_num_closid(struct rdt_resource *ignored)
 {
-	return mpam_partid_max + 1;
+	return min((u32)mpam_partid_max + 1, (u32)RESCTRL_MAX_CLOSID);
 }
 
 u32 resctrl_arch_system_num_rmid_idx(void)
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index ea969ddb1a9d..936fc6e47386 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -123,8 +123,8 @@ static bool resctrl_is_mbm_event(int e)
 }
 
 /*
- * Trivial allocator for CLOSIDs. Use BITMAP APIs to manipulate a bitmap
- * of free CLOSIDs.
+ * Trivial allocator for CLOSIDs. Since h/w only supports a small number,
+ * we can keep a bitmap of free CLOSIDs in a single integer.
  *
  * Using a global CLOSID across all resources has some advantages and
  * some drawbacks:
@@ -137,7 +137,7 @@ static bool resctrl_is_mbm_event(int e)
  * - Our choices on how to configure each resource become progressively more
  *   limited as the number of resources grows.
  */
-static unsigned long *closid_free_map;
+static unsigned long closid_free_map;
 static int closid_free_map_len;
 
 int closids_supported(void)
@@ -148,17 +148,16 @@ int closids_supported(void)
 static void closid_init(void)
 {
 	struct resctrl_schema *s;
-	u32 rdt_min_closid = ~0;
+	u32 rdt_min_closid = 32;
 
 	/* Compute rdt_min_closid across all resources */
 	list_for_each_entry(s, &resctrl_schema_all, list)
 		rdt_min_closid = min(rdt_min_closid, s->num_closid);
 
-	closid_free_map = bitmap_alloc(rdt_min_closid, GFP_KERNEL);
-	bitmap_fill(closid_free_map, rdt_min_closid);
+	closid_free_map = BIT_MASK(rdt_min_closid) - 1;
 
 	/* RESCTRL_RESERVED_CLOSID is always reserved for the default group */
-	__clear_bit(RESCTRL_RESERVED_CLOSID, closid_free_map);
+	__clear_bit(RESCTRL_RESERVED_CLOSID, &closid_free_map);
 	closid_free_map_len = rdt_min_closid;
 }
 
@@ -176,12 +175,12 @@ static int closid_alloc(void)
 			return cleanest_closid;
 		closid = cleanest_closid;
 	} else {
-		closid = find_first_bit(closid_free_map, closid_free_map_len);
-		if (closid == closid_free_map_len)
+		closid = ffs(closid_free_map);
+		if (closid == 0)
 			return -ENOSPC;
+		closid--;
 	}
-
-	__clear_bit(closid, closid_free_map);
+	__clear_bit(closid, &closid_free_map);
 
 	return closid;
 }
@@ -190,7 +189,7 @@ void closid_free(int closid)
 {
 	lockdep_assert_held(&rdtgroup_mutex);
 
-	__set_bit(closid, closid_free_map);
+	__set_bit(closid, &closid_free_map);
 }
 
 /**
@@ -204,7 +203,7 @@ bool closid_allocated(unsigned int closid)
 {
 	lockdep_assert_held(&rdtgroup_mutex);
 
-	return !test_bit(closid, closid_free_map);
+	return !test_bit(closid, &closid_free_map);
 }
 
 /**
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index dc80ddab26cf..00cc0457af50 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -30,6 +30,11 @@ int proc_resctrl_show(struct seq_file *m,
 /* max value for struct rdt_domain's mbps_val */
 #define MBA_MAX_MBPS   U32_MAX
 
+/*
+ * Resctrl uses a u32 as a closid bitmap. The maximum closid is 32.
+ */
+#define RESCTRL_MAX_CLOSID		32
+
 /*
  * Resctrl uses u32 to hold the user-space config. The maximum bitmap size is
  * 32.
-- 
Gitee


From 9135db4f6c33e1f41f3676ecf499c41ed495bf03 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:51 -0800
Subject: [PATCH 068/280] anolis: Revert "arm_mpam: resctrl: Update the rmid
 reallocation limit"

ANBZ: #31045

This reverts commit 7a6d4ec917214da744df7050aba327515187b7a0.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c | 51 ----------------------------
 1 file changed, 51 deletions(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 4062c0f93f85..62bfa7d772d9 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -15,7 +15,6 @@
 #include <linux/resctrl.h>
 #include <linux/slab.h>
 #include <linux/types.h>
-#include <linux/wait.h>
 
 #include <asm/mpam.h>
 
@@ -48,13 +47,6 @@ static bool cdp_enabled;
  */
 static bool resctrl_enabled;
 
-/*
- * mpam_resctrl_pick_caches() needs to know the size of the caches. cacheinfo
- * populates this from a device_initcall(). mpam_resctrl_setup() must wait.
- */
-static bool cacheinfo_ready;
-static DECLARE_WAIT_QUEUE_HEAD(wait_cacheinfo_ready);
-
 /* A dummy mon context to use when the monitors were allocated up front */
 u32 __mon_is_rmid_idx = USE_RMID_IDX;
 void *mon_is_rmid_idx = &__mon_is_rmid_idx;
@@ -412,24 +404,6 @@ void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_domain *d,
 	}
 }
 
-/*
- * The rmid realloc threshold should be for the smallest cache exposed to
- * resctrl.
- */
-static void update_rmid_limits(unsigned int size)
-{
-	u32 num_unique_pmg = resctrl_arch_system_num_rmid_idx();
-
-	if (WARN_ON_ONCE(!size))
-		return;
-
-	if (resctrl_rmid_realloc_limit && size > resctrl_rmid_realloc_limit)
-		return;
-
-	resctrl_rmid_realloc_limit = size;
-	resctrl_rmid_realloc_threshold = size / num_unique_pmg;
-}
-
 static bool cache_has_usable_cpor(struct mpam_class *class)
 {
 	struct mpam_props *cprops = &class->props;
@@ -586,15 +560,11 @@ static u16 percent_to_mbw_max(u8 pc, struct mpam_props *cprops)
 static void mpam_resctrl_pick_caches(void)
 {
 	int idx;
-	unsigned int cache_size;
 	struct mpam_class *class;
 	struct mpam_resctrl_res *res;
 
-	lockdep_assert_cpus_held();
-
 	idx = srcu_read_lock(&mpam_srcu);
 	list_for_each_entry_rcu(class, &mpam_classes, classes_list) {
-		struct mpam_props *cprops = &class->props;
 		bool has_cpor = cache_has_usable_cpor(class);
 
 		if (class->type != MPAM_CLASS_CACHE) {
@@ -620,16 +590,6 @@ static void mpam_resctrl_pick_caches(void)
 			continue;
 		}
 
-		/* Assume cache levels are the same size for all CPUs... */
-		cache_size = get_cpu_cacheinfo_size(smp_processor_id(), class->level);
-		if (!cache_size) {
-			pr_debug("pick_caches: Could not read cache size\n");
-			continue;
-		}
-
-		if (mpam_has_feature(mpam_feat_msmon_csu, cprops))
-			update_rmid_limits(cache_size);
-
 		if (class->level == 2) {
 			res = &mpam_resctrl_exports[RDT_RESOURCE_L2];
 			res->resctrl_res.name = "L2";
@@ -835,8 +795,6 @@ int mpam_resctrl_setup(void)
 	struct mpam_resctrl_res *res;
 	enum resctrl_res_level i;
 
-	wait_event(wait_cacheinfo_ready, cacheinfo_ready);
-
 	cpus_read_lock();
 	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
 		res = &mpam_resctrl_exports[i];
@@ -1201,12 +1159,3 @@ int mpam_resctrl_offline_cpu(unsigned int cpu)
 
 	return 0;
 }
-
-static int __init __cacheinfo_ready(void)
-{
-	cacheinfo_ready = true;
-	wake_up(&wait_cacheinfo_ready);
-
-	return 0;
-}
-device_initcall_sync(__cacheinfo_ready);
-- 
Gitee


From 6abe3d2886440d6db3ebd1a0794a6dbe3a9a8fc6 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:51 -0800
Subject: [PATCH 069/280] anolis: Revert "arm_mpam: resctrl: Call
 resctrl_exit() in the event of errors"

ANBZ: #31045

This reverts commit ba4cc05c8e0892abaad30dbba940c658dd52b3e9.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  |  2 --
 drivers/platform/mpam/mpam_internal.h |  1 -
 drivers/platform/mpam/mpam_resctrl.c  | 17 -----------------
 3 files changed, 20 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 32532a918115..04e1e98e17cb 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -2240,8 +2240,6 @@ static irqreturn_t mpam_disable_thread(int irq, void *dev_id)
 	}
 	mutex_unlock(&mpam_cpuhp_state_lock);
 
-	mpam_resctrl_exit();
-
 	static_branch_disable(&mpam_enabled);
 
 	mpam_unregister_irqs();
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index 48554ff93e09..50d738d83047 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -313,7 +313,6 @@ int mpam_resctrl_online_cpu(unsigned int cpu);
 int mpam_resctrl_offline_cpu(unsigned int cpu);
 
 int mpam_resctrl_setup(void);
-void mpam_resctrl_exit(void);
 
 /*
  * MPAM MSCs have the following register layout. See:
diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 62bfa7d772d9..976641a2af12 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -41,12 +41,6 @@ static struct mpam_class *mbm_total_class;
  */
 static bool cdp_enabled;
 
-/*
- * If resctrl_init() succeeded, resctrl_exit() can be used to remove support
- * for the filesystem in the event of an error.
- */
-static bool resctrl_enabled;
-
 /* A dummy mon context to use when the monitors were allocated up front */
 u32 __mon_is_rmid_idx = USE_RMID_IDX;
 void *mon_is_rmid_idx = &__mon_is_rmid_idx;
@@ -832,22 +826,11 @@ int mpam_resctrl_setup(void)
 		}
 
 		err = resctrl_init();
-		if (!err)
-			WRITE_ONCE(resctrl_enabled, true);
 	}
 
 	return err;
 }
 
-void mpam_resctrl_exit(void)
-{
-	if (!READ_ONCE(resctrl_enabled))
-		return;
-
-	WRITE_ONCE(resctrl_enabled, false);
-	resctrl_exit();
-}
-
 u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
 			    u32 closid, enum resctrl_conf_type type)
 {
-- 
Gitee


From a10e321fe3c4e440252b29529e61b92a04768eb8 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:51 -0800
Subject: [PATCH 070/280] anolis: Revert "arm_mpam: resctrl: Tell resctrl about
 cpu/domain online/offline"

ANBZ: #31045

This reverts commit ac8ed1c572b27b8821ac5f70a4b12d731c769e7b.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 976641a2af12..328837867d60 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -825,7 +825,7 @@ int mpam_resctrl_setup(void)
 			pr_warn("Number of PMG is not a power of 2! resctrl may misbehave");
 		}
 
-		err = resctrl_init();
+		/* TODO: call resctrl_init() */
 	}
 
 	return err;
@@ -1080,7 +1080,7 @@ struct rdt_domain *resctrl_arch_find_domain(struct rdt_resource *r, int id)
 
 int mpam_resctrl_online_cpu(unsigned int cpu)
 {
-	int i, err;
+	int i;
 	struct mpam_resctrl_dom *dom;
 	struct mpam_resctrl_res *res;
 
@@ -1099,12 +1099,8 @@ int mpam_resctrl_online_cpu(unsigned int cpu)
 		dom = mpam_resctrl_alloc_domain(cpu, res);
 		if (IS_ERR(dom))
 			return PTR_ERR(dom);
-		err = resctrl_online_domain(&res->resctrl_res, &dom->resctrl_dom);
-		if (err)
-			return err;
 	}
 
-	resctrl_online_cpu(cpu);
 	return 0;
 }
 
@@ -1115,8 +1111,6 @@ int mpam_resctrl_offline_cpu(unsigned int cpu)
 	struct mpam_resctrl_res *res;
 	struct mpam_resctrl_dom *dom;
 
-	resctrl_offline_cpu(cpu);
-
 	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
 		res = &mpam_resctrl_exports[i];
 
@@ -1135,7 +1129,6 @@ int mpam_resctrl_offline_cpu(unsigned int cpu)
 		if (!cpumask_empty(&d->cpu_mask))
 			continue;
 
-		resctrl_offline_domain(&res->resctrl_res, &dom->resctrl_dom);
 		list_del(&d->list);
 		kfree(dom);
 	}
-- 
Gitee


From 79743fbd7c00acefd893b9d5d0f39cb333350031 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:51 -0800
Subject: [PATCH 071/280] anolis: Revert "perf/arm-cmn: Stop claiming all the
 resources"

ANBZ: #31045

This reverts commit faf97c06fed3a01996dd83d368398e07e5c64a1f.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/perf/arm-cmn.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index 2f022d1fb052..77aa37de5988 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -2435,7 +2435,6 @@ static int arm_cmn_probe(struct platform_device *pdev)
 	struct arm_cmn *cmn;
 	const char *name;
 	static atomic_t id;
-	struct resource *cfg;
 	int err, rootnode, this_id;
 
 	cmn = devm_kzalloc(&pdev->dev, sizeof(*cmn), GFP_KERNEL);
@@ -2451,16 +2450,7 @@ static int arm_cmn_probe(struct platform_device *pdev)
 		rootnode = arm_cmn600_acpi_probe(pdev, cmn);
 	} else {
 		rootnode = 0;
-
-		/*
-		 * Avoid registering resources as the PMUs registers are
-		 * scattered through CMN, and may appear either side of
-		 * registers for other 'devices'. (e.g. the MPAM MSC controls).
-		 */
-		cfg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-		if (!cfg)
-			return -EINVAL;
-		cmn->base = devm_ioremap(&pdev->dev, cfg->start, resource_size(cfg));
+		cmn->base = devm_platform_ioremap_resource(pdev, 0);
 		if (IS_ERR(cmn->base))
 			return PTR_ERR(cmn->base);
 		if (cmn->part == PART_CMN600)
-- 
Gitee


From 00fa6b0006a7b1cb992a4d1f24359cf0077eef76 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:51 -0800
Subject: [PATCH 072/280] anolis: Revert "arm64: mpam: Select
 ARCH_HAS_CPU_RESCTRL"

ANBZ: #31045

This reverts commit 402a0ef3e02c4a06421c81abe7ad24c794a432e3.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/arm64/Kconfig               | 3 +--
 arch/arm64/include/asm/resctrl.h | 2 --
 drivers/platform/mpam/Kconfig    | 4 +---
 3 files changed, 2 insertions(+), 7 deletions(-)
 delete mode 100644 arch/arm64/include/asm/resctrl.h

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 592ea627edb3..659e1ac54f4c 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -2069,8 +2069,7 @@ config ARM64_TLB_RANGE
 config ARM64_MPAM
 	bool "Enable support for MPAM"
 	select ACPI_MPAM if ACPI
-	select ARCH_HAS_CPU_RESCTRL
-	select RESCTRL_FS
+	select ARM_CPU_RESCTRL
 	help
 	  Memory Partitioning and Monitoring is an optional extension
 	  that allows the CPUs to mark load and store transactions with
diff --git a/arch/arm64/include/asm/resctrl.h b/arch/arm64/include/asm/resctrl.h
deleted file mode 100644
index b506e95cf6e3..000000000000
--- a/arch/arm64/include/asm/resctrl.h
+++ /dev/null
@@ -1,2 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#include <linux/arm_mpam.h>
diff --git a/drivers/platform/mpam/Kconfig b/drivers/platform/mpam/Kconfig
index 75f5b2454fbe..13bd86fc5e58 100644
--- a/drivers/platform/mpam/Kconfig
+++ b/drivers/platform/mpam/Kconfig
@@ -2,7 +2,5 @@
 # CPU resources, not containers or cgroups etc.
 config ARM_CPU_RESCTRL
 	bool
-	default y
-	depends on ARM64 && ARCH_HAS_CPU_RESCTRL
-	depends on MISC_FILESYSTEMS
+	depends on ARM64
 	select RESCTRL_RMID_DEPENDS_ON_CLOSID
-- 
Gitee


From 72f71183de046e8d91f9c50ad43fec8846f94778 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 073/280] anolis: Revert "arm_mpam: resctrl: Add dummy
 definition for free running counters"

ANBZ: #31045

This reverts commit 19a5282070b963bc9f36aeec7cfc10addad90fbe.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/arm_mpam.h | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index 239d27af9e32..f6b92060b811 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -55,12 +55,6 @@ static inline unsigned int resctrl_arch_round_mon_val(unsigned int val)
 	return val;
 }
 
-/* MPAM counters requires a monitor to be allocated */
-static inline bool resctrl_arch_event_is_free_running(enum resctrl_event_id evt)
-{
-	return false;
-}
-
 bool resctrl_arch_alloc_capable(void);
 bool resctrl_arch_mon_capable(void);
 bool resctrl_arch_is_llc_occupancy_enabled(void);
-- 
Gitee


From 91cb2aaab8777b00dd7e9028be135abe6f5c9c78 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 074/280] anolis: Revert "arm_mpam: resctrl: Add empty
 definitions for fine-grained enables"

ANBZ: #31045

This reverts commit a023b4a7164acf06a575e93e7b863d01b983a826.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/arm_mpam.h | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index f6b92060b811..8897309c163d 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -87,13 +87,4 @@ static inline int resctrl_arch_measure_l3_residency(void *_plr) { return 0; }
 static inline int resctrl_arch_measure_cycles_lat_fn(void *_plr) { return 0; }
 static inline u64 resctrl_arch_get_prefetch_disable_bits(void) { return 0; }
 
-/*
- * The CPU configuration for MPAM is cheap to write, and is only written if it
- * has changed. No need for fine grained enables.
- */
-static inline void resctrl_arch_enable_mon(void) { }
-static inline void resctrl_arch_disable_mon(void) { }
-static inline void resctrl_arch_enable_alloc(void) { }
-static inline void resctrl_arch_disable_alloc(void) { }
-
 #endif /* __LINUX_ARM_MPAM_H */
-- 
Gitee


From 9508798877e76470bf2161ad98fcf865bc259c4d Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 075/280] anolis: Revert "arm_mpam: resctrl: Add empty
 definitions for pseudo lock"

ANBZ: #31045

This reverts commit 7f8f16bd57fec307f368e5e46cc59dce912e6058.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/arm_mpam.h | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index 8897309c163d..abadaba0085f 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -80,11 +80,4 @@ struct rdt_resource;
 void *resctrl_arch_mon_ctx_alloc(struct rdt_resource *r, int evtid);
 void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid, void *ctx);
 
-/* Pseudo lock is not supported by MPAM */
-static inline int resctrl_arch_pseudo_lock_fn(void *_plr) { return 0; }
-static inline int resctrl_arch_measure_l2_residency(void *_plr) { return 0; }
-static inline int resctrl_arch_measure_l3_residency(void *_plr) { return 0; }
-static inline int resctrl_arch_measure_cycles_lat_fn(void *_plr) { return 0; }
-static inline u64 resctrl_arch_get_prefetch_disable_bits(void) { return 0; }
-
 #endif /* __LINUX_ARM_MPAM_H */
-- 
Gitee


From 2f19015955db964a655f3994e54c58f55f794ae1 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 076/280] anolis: Revert "untested: arm_mpam: resctrl: Allow
 monitors to be configured"

ANBZ: #31045

This reverts commit f43d7a4edfa633583e55f07c9949d67f02800fd0.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 26 -----------
 drivers/platform/mpam/mpam_internal.h |  9 ----
 drivers/platform/mpam/mpam_resctrl.c  | 62 ---------------------------
 3 files changed, 97 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 04e1e98e17cb..5ebb944ad9fc 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -1076,32 +1076,6 @@ int mpam_msmon_read(struct mpam_component *comp, struct mon_cfg *ctx,
 	return err;
 }
 
-void mpam_msmon_reset_all_mbwu(struct mpam_component *comp)
-{
-	int idx, i;
-	unsigned long flags;
-	struct mpam_msc *msc;
-	struct mpam_msc_ris *ris;
-
-	if (!mpam_is_enabled())
-		return;
-
-	idx = srcu_read_lock(&mpam_srcu);
-	list_for_each_entry_rcu(ris, &comp->ris, comp_list) {
-		if (!mpam_has_feature(mpam_feat_msmon_mbwu, &ris->props))
-			continue;
-
-		msc = ris->msc;
-		spin_lock_irqsave(&msc->mon_sel_lock, flags);
-		for (i = 0; i < ris->props.num_mbwu_mon; i++) {
-			ris->mbwu_state[i].correction = 0;
-			ris->mbwu_state[i].reset_on_next_read = true;
-		}
-		spin_unlock_irqrestore(&msc->mon_sel_lock, flags);
-	}
-	srcu_read_unlock(&mpam_srcu, idx);
-}
-
 void mpam_msmon_reset_mbwu(struct mpam_component *comp, struct mon_cfg *ctx)
 {
 	int idx;
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index 50d738d83047..8d4bcc1f5642 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -20,12 +20,6 @@ DECLARE_STATIC_KEY_FALSE(mpam_enabled);
 /* Value to indicate the allocated monitor is derived from the RMID index. */
 #define USE_RMID_IDX	(U16_MAX + 1)
 
-/*
- * Only these event configuration bits are supported. MPAM can't know if
- * data is being written back, these will show up as a write.
- */
-#define MPAM_RESTRL_EVT_CONFIG_VALID	(READS_TO_LOCAL_MEM | NON_TEMP_WRITE_TO_LOCAL_MEM)
-
 static inline bool mpam_is_enabled(void)
 {
 	return static_branch_likely(&mpam_enabled);
@@ -246,8 +240,6 @@ struct mpam_msc_ris {
 struct mpam_resctrl_dom {
 	struct mpam_component	*comp;
 	struct rdt_domain	resctrl_dom;
-
-	u32			mbm_local_evt_cfg;
 };
 
 struct mpam_resctrl_res {
@@ -307,7 +299,6 @@ int mpam_apply_config(struct mpam_component *comp, u16 partid,
 int mpam_msmon_read(struct mpam_component *comp, struct mon_cfg *ctx,
 		    enum mpam_device_features, u64 *val);
 void mpam_msmon_reset_mbwu(struct mpam_component *comp, struct mon_cfg *ctx);
-void mpam_msmon_reset_all_mbwu(struct mpam_component *comp);
 
 int mpam_resctrl_online_cpu(unsigned int cpu);
 int mpam_resctrl_offline_cpu(unsigned int cpu);
diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 328837867d60..730ea6c6dffc 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -306,18 +306,6 @@ void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid,
 	}
 }
 
-static enum mon_filter_options resctrl_evt_config_to_mpam(u32 local_evt_cfg)
-{
-	switch (local_evt_cfg) {
-	case READS_TO_LOCAL_MEM:
-		return COUNT_READ;
-	case NON_TEMP_WRITE_TO_LOCAL_MEM:
-		return COUNT_WRITE;
-	default:
-		return COUNT_BOTH;
-	}
-}
-
 int resctrl_arch_rmid_read(struct rdt_resource	*r, struct rdt_domain *d,
 			   u32 closid, u32 rmid, enum resctrl_event_id eventid,
 			   u64 *val, void *arch_mon_ctx)
@@ -351,7 +339,6 @@ int resctrl_arch_rmid_read(struct rdt_resource	*r, struct rdt_domain *d,
 
 	cfg.match_pmg = true;
 	cfg.pmg = rmid;
-	cfg.opts = resctrl_evt_config_to_mpam(dom->mbm_local_evt_cfg);
 
 	if (cdp_enabled) {
 		cfg.partid = closid << 1;
@@ -634,54 +621,6 @@ static void mpam_resctrl_pick_mba(void)
 	}
 }
 
-bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt)
-{
-	struct mpam_props *cprops;
-
-	switch (evt) {
-	case QOS_L3_MBM_LOCAL_EVENT_ID:
-		if (!mbm_local_class)
-			return false;
-		cprops = &mbm_local_class->props;
-
-		return mpam_has_feature(mpam_feat_msmon_mbwu_rwbw, cprops);
-	default:
-		return false;
-	}
-}
-
-void resctrl_arch_mon_event_config_read(void *info)
-{
-	struct mpam_resctrl_dom *dom;
-	struct resctrl_mon_config_info *mon_info = info;
-
-	dom = container_of(mon_info->d, struct mpam_resctrl_dom, resctrl_dom);
-	mon_info->mon_config = dom->mbm_local_evt_cfg & MAX_EVT_CONFIG_BITS;
-}
-
-void resctrl_arch_mon_event_config_write(void *info)
-{
-	struct mpam_resctrl_dom *dom;
-	struct resctrl_mon_config_info *mon_info = info;
-
-	if (mon_info->mon_config & ~MPAM_RESTRL_EVT_CONFIG_VALID) {
-		mon_info->err = -EOPNOTSUPP;
-		return;
-	}
-
-	dom = container_of(mon_info->d, struct mpam_resctrl_dom, resctrl_dom);
-	dom->mbm_local_evt_cfg = mon_info->mon_config & MPAM_RESTRL_EVT_CONFIG_VALID;
-}
-
-void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_domain *d)
-{
-	struct mpam_resctrl_dom *dom;
-
-	dom = container_of(d, struct mpam_resctrl_dom, resctrl_dom);
-	dom->mbm_local_evt_cfg = MPAM_RESTRL_EVT_CONFIG_VALID;
-	mpam_msmon_reset_all_mbwu(dom->comp);
-}
-
 static int mpam_resctrl_resource_init(struct mpam_resctrl_res *res)
 {
 	struct mpam_class *class = res->class;
@@ -1034,7 +973,6 @@ mpam_resctrl_alloc_domain(unsigned int cpu, struct mpam_resctrl_res *res)
 	dom->comp = comp;
 	INIT_LIST_HEAD(&dom->resctrl_dom.list);
 	dom->resctrl_dom.id = comp->comp_id;
-	dom->mbm_local_evt_cfg = MPAM_RESTRL_EVT_CONFIG_VALID;
 	cpumask_set_cpu(cpu, &dom->resctrl_dom.cpu_mask);
 
 	/* TODO: this list should be sorted */
-- 
Gitee


From e5dca0b21f9fd2fb43e9cd1d5b067ca153681ff1 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 077/280] anolis: Revert "arm_mpam: resctrl: Add
 resctrl_arch_rmid_read() and resctrl_arch_reset_rmid()"

ANBZ: #31045

This reverts commit e56d73dc30923fb4cfd1dcbf9732be8385ab1887.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c | 79 ----------------------------
 include/linux/arm_mpam.h             |  4 --
 2 files changed, 83 deletions(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 730ea6c6dffc..8cb4707a4117 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -306,85 +306,6 @@ void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid,
 	}
 }
 
-int resctrl_arch_rmid_read(struct rdt_resource	*r, struct rdt_domain *d,
-			   u32 closid, u32 rmid, enum resctrl_event_id eventid,
-			   u64 *val, void *arch_mon_ctx)
-{
-	int err;
-	u64 cdp_val;
-	struct mon_cfg cfg;
-	struct mpam_resctrl_dom *dom;
-	u32 mon = *(u32 *)arch_mon_ctx;
-	enum mpam_device_features type;
-
-	resctrl_arch_rmid_read_context_check();
-
-	dom = container_of(d, struct mpam_resctrl_dom, resctrl_dom);
-
-	switch (eventid) {
-	case QOS_L3_OCCUP_EVENT_ID:
-		type = mpam_feat_msmon_csu;
-		break;
-	case QOS_L3_MBM_LOCAL_EVENT_ID:
-	case QOS_L3_MBM_TOTAL_EVENT_ID:
-		type = mpam_feat_msmon_mbwu;
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	cfg.mon = mon;
-	if (cfg.mon == USE_RMID_IDX)
-		cfg.mon = resctrl_arch_rmid_idx_encode(closid, rmid);
-
-	cfg.match_pmg = true;
-	cfg.pmg = rmid;
-
-	if (cdp_enabled) {
-		cfg.partid = closid << 1;
-		err = mpam_msmon_read(dom->comp, &cfg, type, val);
-		if (err)
-			return err;
-
-		cfg.partid += 1;
-		err = mpam_msmon_read(dom->comp, &cfg, type, &cdp_val);
-		if (!err)
-			*val += cdp_val;
-	} else {
-		cfg.partid = closid;
-		err = mpam_msmon_read(dom->comp, &cfg, type, val);
-	}
-
-	return err;
-}
-
-void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_domain *d,
-			     u32 closid, u32 rmid, enum resctrl_event_id eventid)
-{
-	struct mon_cfg cfg;
-	struct mpam_resctrl_dom *dom;
-
-	if (eventid != QOS_L3_MBM_LOCAL_EVENT_ID)
-		return;
-
-	cfg.mon = resctrl_arch_rmid_idx_encode(closid, rmid);
-	cfg.match_pmg = true;
-	cfg.pmg = rmid;
-
-	dom = container_of(d, struct mpam_resctrl_dom, resctrl_dom);
-
-	if (cdp_enabled) {
-		cfg.partid = closid << 1;
-		mpam_msmon_reset_mbwu(dom->comp, &cfg);
-
-		cfg.partid += 1;
-		mpam_msmon_reset_mbwu(dom->comp, &cfg);
-	} else {
-		cfg.partid = closid;
-		mpam_msmon_reset_mbwu(dom->comp, &cfg);
-	}
-}
-
 static bool cache_has_usable_cpor(struct mpam_class *class)
 {
 	struct mpam_props *cprops = &class->props;
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index abadaba0085f..88000eb59c6f 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -50,10 +50,6 @@ int mpam_register_requestor(u16 partid_max, u8 pmg_max);
 int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
 		    enum mpam_class_types type, u8 class_id, int component_id);
 
-static inline unsigned int resctrl_arch_round_mon_val(unsigned int val)
-{
-	return val;
-}
 
 bool resctrl_arch_alloc_capable(void);
 bool resctrl_arch_mon_capable(void);
-- 
Gitee


From 594d85b0d19d472a0b816684b21b5953aa2da476 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 078/280] anolis: Revert "arm_mpam: resctrl: Allow resctrl to
 allocate monitors"

ANBZ: #31045

This reverts commit dfcd57db32144e43b211d4336cb527c3ebea12f3.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_internal.h |  3 --
 drivers/platform/mpam/mpam_resctrl.c  | 72 ---------------------------
 include/linux/arm_mpam.h              |  4 --
 3 files changed, 79 deletions(-)

diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index 8d4bcc1f5642..36c49cfb9271 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -17,9 +17,6 @@
 
 DECLARE_STATIC_KEY_FALSE(mpam_enabled);
 
-/* Value to indicate the allocated monitor is derived from the RMID index. */
-#define USE_RMID_IDX	(U16_MAX + 1)
-
 static inline bool mpam_is_enabled(void)
 {
 	return static_branch_likely(&mpam_enabled);
diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 8cb4707a4117..4786be5dc4b4 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -22,8 +22,6 @@
 
 u64 mpam_resctrl_default_group;
 
-DECLARE_WAIT_QUEUE_HEAD(resctrl_mon_ctx_waiters);
-
 /*
  * The classes we've picked to map to resctrl resources.
  * Class pointer may be NULL.
@@ -41,10 +39,6 @@ static struct mpam_class *mbm_total_class;
  */
 static bool cdp_enabled;
 
-/* A dummy mon context to use when the monitors were allocated up front */
-u32 __mon_is_rmid_idx = USE_RMID_IDX;
-void *mon_is_rmid_idx = &__mon_is_rmid_idx;
-
 bool resctrl_arch_alloc_capable(void)
 {
 	return exposed_alloc_capable;
@@ -240,72 +234,6 @@ struct rdt_resource *resctrl_arch_get_resource(enum resctrl_res_level l)
 	return &mpam_resctrl_exports[l].resctrl_res;
 }
 
-static void *resctrl_arch_mon_ctx_alloc_no_wait(struct rdt_resource *r,
-						int evtid)
-{
-	struct mpam_resctrl_res *res;
-	u32 *ret = kmalloc(sizeof(*ret), GFP_KERNEL);
-
-	if (!ret)
-		return ERR_PTR(-ENOMEM);
-
-	switch (evtid) {
-	case QOS_L3_OCCUP_EVENT_ID:
-		res = container_of(r, struct mpam_resctrl_res, resctrl_res);
-
-		*ret = mpam_alloc_csu_mon(res->class);
-		return ret;
-	case QOS_L3_MBM_LOCAL_EVENT_ID:
-	case QOS_L3_MBM_TOTAL_EVENT_ID:
-		return mon_is_rmid_idx;
-	}
-
-	return ERR_PTR(-EOPNOTSUPP);
-}
-
-void *resctrl_arch_mon_ctx_alloc(struct rdt_resource *r, int evtid)
-{
-	DEFINE_WAIT(wait);
-	void *ret;
-
-	might_sleep();
-
-	do {
-		prepare_to_wait(&resctrl_mon_ctx_waiters, &wait,
-				TASK_INTERRUPTIBLE);
-		ret = resctrl_arch_mon_ctx_alloc_no_wait(r, evtid);
-		if (PTR_ERR(ret) == -ENOSPC)
-			schedule();
-	} while (PTR_ERR(ret) == -ENOSPC && !signal_pending(current));
-	finish_wait(&resctrl_mon_ctx_waiters, &wait);
-
-	return ret;
-}
-
-void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid,
-			       void *arch_mon_ctx)
-{
-	struct mpam_resctrl_res *res;
-	u32 mon = *(u32 *)arch_mon_ctx;
-
-	if (mon == USE_RMID_IDX)
-		return;
-	kfree(arch_mon_ctx);
-	arch_mon_ctx = NULL;
-
-	res = container_of(r, struct mpam_resctrl_res, resctrl_res);
-
-	switch (evtid) {
-	case QOS_L3_OCCUP_EVENT_ID:
-		mpam_free_csu_mon(res->class, mon);
-		wake_up(&resctrl_mon_ctx_waiters);
-		return;
-	case QOS_L3_MBM_TOTAL_EVENT_ID:
-	case QOS_L3_MBM_LOCAL_EVENT_ID:
-		return;
-	}
-}
-
 static bool cache_has_usable_cpor(struct mpam_class *class)
 {
 	struct mpam_props *cprops = &class->props;
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index 88000eb59c6f..49416f22244a 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -72,8 +72,4 @@ u32 resctrl_arch_rmid_idx_encode(u32 closid, u32 rmid);
 void resctrl_arch_rmid_idx_decode(u32 idx, u32 *closid, u32 *rmid);
 u32 resctrl_arch_system_num_rmid_idx(void);
 
-struct rdt_resource;
-void *resctrl_arch_mon_ctx_alloc(struct rdt_resource *r, int evtid);
-void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid, void *ctx);
-
 #endif /* __LINUX_ARM_MPAM_H */
-- 
Gitee


From c48b46e6fc50eb5d1a05e4776f3057fe39e39074 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 079/280] anolis: Revert "untested: arm_mpam: resctrl: Add
 support for mbm counters"

ANBZ: #31045

This reverts commit d805a4483ef4813c47801ded07b01ec7fbf6698a.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c | 52 +---------------------------
 include/linux/arm_mpam.h             |  6 +++-
 2 files changed, 6 insertions(+), 52 deletions(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 4786be5dc4b4..b4be7f81e79b 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -31,7 +31,6 @@ static struct mpam_resctrl_res mpam_resctrl_exports[RDT_NUM_RESOURCES];
 static bool exposed_alloc_capable;
 static bool exposed_mon_capable;
 static struct mpam_class *mbm_local_class;
-static struct mpam_class *mbm_total_class;
 
 /*
  * MPAM emulates CDP by setting different PARTID in the I/D fields of MPAM1_EL1.
@@ -54,11 +53,6 @@ bool resctrl_arch_is_mbm_local_enabled(void)
 	return mbm_local_class;
 }
 
-bool resctrl_arch_is_mbm_total_enabled(void)
-{
-	return mbm_total_class;
-}
-
 bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level rid)
 {
 	switch (rid) {
@@ -272,24 +266,6 @@ bool resctrl_arch_is_llc_occupancy_enabled(void)
 	return cache_has_usable_csu(mpam_resctrl_exports[RDT_RESOURCE_L3].class);
 }
 
-static bool class_has_usable_mbwu(struct mpam_class *class)
-{
-	struct mpam_props *cprops = &class->props;
-
-	if (!mpam_has_feature(mpam_feat_msmon_mbwu, cprops))
-		return false;
-
-	/*
-	 * resctrl expects the bandwidth counters to be free running,
-	 * which means we need as many monitors as resctrl has
-	 * control/monitor groups.
-	 */
-	if (cprops->num_mbwu_mon < resctrl_arch_system_num_rmid_idx())
-		return false;
-
-	return (mpam_partid_max > 1) || (mpam_pmg_max != 0);
-}
-
 static bool mba_class_use_mbw_part(struct mpam_props *cprops)
 {
 	/* TODO: Scaling is not yet supported */
@@ -474,13 +450,10 @@ static int mpam_resctrl_resource_init(struct mpam_resctrl_res *res)
 {
 	struct mpam_class *class = res->class;
 	struct rdt_resource *r = &res->resctrl_res;
-	bool has_mbwu = class_has_usable_mbwu(class);
 
 	/* Is this one of the two well-known caches? */
 	if (res->resctrl_res.rid == RDT_RESOURCE_L2 ||
 	    res->resctrl_res.rid == RDT_RESOURCE_L3) {
-		bool has_csu = cache_has_usable_csu(class);
-
 		/* TODO: Scaling is not yet supported */
 		r->cache.cbm_len = class->props.cpbm_wd;
 		r->cache.arch_has_sparse_bitmasks = true;
@@ -507,25 +480,8 @@ static int mpam_resctrl_resource_init(struct mpam_resctrl_res *res)
 			exposed_alloc_capable = true;
 		}
 
-		/*
-		 * MBWU counters may be 'local' or 'total' depending on where
-		 * they are in the topology. Counters on caches are assumed to
-		 * be local. If it's on the memory controller, its assumed to
-		 * be global.
-		 */
-		if (has_mbwu && class->level >= 3) {
-			mbm_local_class = class;
+		if (class->level == 3 && cache_has_usable_csu(class))
 			r->mon_capable = true;
-		}
-
-		/*
-		 * CSU counters only make sense on a cache. The file is called
-		 * llc_occupancy, but its expected to the on the L3.
-		 */
-		if (has_csu && class->type == MPAM_CLASS_CACHE &&
-		    class->level == 3) {
-			r->mon_capable = true;
-		}
 	} else if (res->resctrl_res.rid == RDT_RESOURCE_MBA) {
 		struct mpam_props *cprops = &class->props;
 
@@ -547,11 +503,6 @@ static int mpam_resctrl_resource_init(struct mpam_resctrl_res *res)
 			r->alloc_capable = true;
 			exposed_alloc_capable = true;
 		}
-
-		if (has_mbwu && class->type == MPAM_CLASS_MEMORY) {
-			mbm_total_class = class;
-			r->mon_capable = true;
-		}
 	}
 
 	if (r->mon_capable) {
@@ -587,7 +538,6 @@ int mpam_resctrl_setup(void)
 
 	mpam_resctrl_pick_caches();
 	mpam_resctrl_pick_mba();
-	/* TODO: mpam_resctrl_pick_counters(); */
 
 	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
 		res = &mpam_resctrl_exports[i];
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index 49416f22244a..d41891df56d4 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -55,7 +55,11 @@ bool resctrl_arch_alloc_capable(void);
 bool resctrl_arch_mon_capable(void);
 bool resctrl_arch_is_llc_occupancy_enabled(void);
 bool resctrl_arch_is_mbm_local_enabled(void);
-bool resctrl_arch_is_mbm_total_enabled(void);
+
+static inline bool resctrl_arch_is_mbm_total_enabled(void)
+{
+	return false;
+}
 
 /* reset cached configurations, then all devices */
 void resctrl_arch_reset_resources(void);
-- 
Gitee


From 1737dc16590921595b47f1d6eaf9a7b03f307fae Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 080/280] anolis: Revert "untested: arm_mpam: resctrl: Add
 support for MB resource"

ANBZ: #31045

This reverts commit 773749b7e7cf7d05f73d354563e55e76f05386d0.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c | 219 +--------------------------
 1 file changed, 3 insertions(+), 216 deletions(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index b4be7f81e79b..1efefbf1313b 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -53,20 +53,9 @@ bool resctrl_arch_is_mbm_local_enabled(void)
 	return mbm_local_class;
 }
 
-bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level rid)
+bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level ignored)
 {
-	switch (rid) {
-	case RDT_RESOURCE_L2:
-	case RDT_RESOURCE_L3:
-		return cdp_enabled;
-	case RDT_RESOURCE_MBA:
-	default:
-		/*
-		 * x86's MBA control doesn't support CDP, so user-space doesn't
-		 * expect it.
-		 */
-		return false;
-	}
+	return cdp_enabled;
 }
 
 int resctrl_arch_set_cdp_enabled(enum resctrl_res_level ignored, bool enable)
@@ -94,11 +83,6 @@ int resctrl_arch_set_cdp_enabled(enum resctrl_res_level ignored, bool enable)
 	return 0;
 }
 
-static bool mpam_resctrl_hide_cdp(enum resctrl_res_level rid)
-{
-	return cdp_enabled && !resctrl_arch_get_cdp_enabled(rid);
-}
-
 /*
  * MSC may raise an error interrupt if it sees an out or range partid/pmg,
  * and go on to truncate the value. Regardless of what the hardware supports,
@@ -266,102 +250,6 @@ bool resctrl_arch_is_llc_occupancy_enabled(void)
 	return cache_has_usable_csu(mpam_resctrl_exports[RDT_RESOURCE_L3].class);
 }
 
-static bool mba_class_use_mbw_part(struct mpam_props *cprops)
-{
-	/* TODO: Scaling is not yet supported */
-	return (mpam_has_feature(mpam_feat_mbw_part, cprops) &&
-		cprops->mbw_pbm_bits < MAX_MBA_BW);
-}
-
-static bool class_has_usable_mba(struct mpam_props *cprops)
-{
-	if (mba_class_use_mbw_part(cprops) ||
-	    mpam_has_feature(mpam_feat_mbw_max, cprops))
-		return true;
-
-	return false;
-}
-
-/*
- * Calculate the percentage change from each implemented bit in the control
- * This can return 0 when BWA_WD is greater than 6. (100 / (1<<7) == 0)
- */
-static u32 get_mba_granularity(struct mpam_props *cprops)
-{
-	if (mba_class_use_mbw_part(cprops)) {
-		return MAX_MBA_BW / cprops->mbw_pbm_bits;
-	} else if (mpam_has_feature(mpam_feat_mbw_max, cprops)) {
-		/*
-		 * bwa_wd is the number of bits implemented in the 0.xxx
-		 * fixed point fraction. 1 bit is 50%, 2 is 25% etc.
-		 */
-		return MAX_MBA_BW / (cprops->bwa_wd + 1);
-	}
-
-	return 0;
-}
-
-static u32 mbw_pbm_to_percent(unsigned long mbw_pbm, struct mpam_props *cprops)
-{
-	u32 bit, result = 0, granularity = get_mba_granularity(cprops);
-
-	for_each_set_bit(bit, &mbw_pbm, cprops->mbw_pbm_bits % 32) {
-		result += granularity;
-	}
-
-	return result;
-}
-
-static u32 mbw_max_to_percent(u16 mbw_max, struct mpam_props *cprops)
-{
-	u8 bit;
-	u32 divisor = 2, value = 0;
-
-	for (bit = 15; bit; bit--) {
-		if (mbw_max & BIT(bit))
-			value += MAX_MBA_BW / divisor;
-		divisor <<= 1;
-	}
-
-	return value;
-}
-
-static u32 percent_to_mbw_pbm(u8 pc, struct mpam_props *cprops)
-{
-	u32 granularity = get_mba_granularity(cprops);
-	u8 num_bits = pc / granularity;
-
-	if (!num_bits)
-		return 0;
-
-	/* TODO: pick bits at random to avoid contention */
-	return (1 << num_bits) - 1;
-}
-
-static u16 percent_to_mbw_max(u8 pc, struct mpam_props *cprops)
-{
-	u8 bit;
-	u32 divisor = 2, value = 0;
-
-	if (WARN_ON_ONCE(cprops->bwa_wd > 15))
-		return MAX_MBA_BW;
-
-	for (bit = 15; bit; bit--) {
-		if (pc >= MAX_MBA_BW / divisor) {
-			pc -= MAX_MBA_BW / divisor;
-			value |= BIT(bit);
-		}
-		divisor <<= 1;
-
-		if (!pc || !(MAX_MBA_BW / divisor))
-			break;
-	}
-
-	value &= GENMASK(15, 15 - cprops->bwa_wd);
-
-	return value;
-}
-
 /* Test whether we can export MPAM_CLASS_CACHE:{2,3}? */
 static void mpam_resctrl_pick_caches(void)
 {
@@ -408,44 +296,6 @@ static void mpam_resctrl_pick_caches(void)
 	srcu_read_unlock(&mpam_srcu, idx);
 }
 
-static void mpam_resctrl_pick_mba(void)
-{
-	struct mpam_class *class, *candidate_class = NULL;
-	struct mpam_resctrl_res *res;
-	int idx;
-
-	lockdep_assert_cpus_held();
-
-	idx = srcu_read_lock(&mpam_srcu);
-	list_for_each_entry_rcu(class, &mpam_classes, classes_list) {
-		struct mpam_props *cprops = &class->props;
-
-		if (class->level < 3)
-			continue;
-
-		if (!class_has_usable_mba(cprops))
-			continue;
-
-		if (!cpumask_equal(&class->affinity, cpu_possible_mask))
-			continue;
-
-		/*
-		 * mba_sc reads the mbm_local counter, and waggles the MBA controls.
-		 * mbm_local is implicitly part of the L3, pick a resouce to be MBA
-		 * that as close as possible to the L3.
-		 */
-		if (!candidate_class || class->level < candidate_class->level)
-			candidate_class = class;
-	}
-	srcu_read_unlock(&mpam_srcu, idx);
-
-	if (candidate_class) {
-		res = &mpam_resctrl_exports[RDT_RESOURCE_MBA];
-		res->class = candidate_class;
-		res->resctrl_res.name = "MB";
-	}
-}
-
 static int mpam_resctrl_resource_init(struct mpam_resctrl_res *res)
 {
 	struct mpam_class *class = res->class;
@@ -482,27 +332,6 @@ static int mpam_resctrl_resource_init(struct mpam_resctrl_res *res)
 
 		if (class->level == 3 && cache_has_usable_csu(class))
 			r->mon_capable = true;
-	} else if (res->resctrl_res.rid == RDT_RESOURCE_MBA) {
-		struct mpam_props *cprops = &class->props;
-
-		/* TODO: kill these properties off as they are derivatives */
-		r->format_str = "%d=%0*u";
-		r->fflags = RFTYPE_RES_MB;
-		r->default_ctrl = MAX_MBA_BW;
-		r->data_width = 3;
-
-		r->membw.delay_linear = true;
-		r->membw.throttle_mode = THREAD_THROTTLE_UNDEFINED;
-		r->membw.bw_gran = get_mba_granularity(cprops);
-
-		/* Round up to at least 1% */
-		if (!r->membw.bw_gran)
-			r->membw.bw_gran = 1;
-
-		if (class_has_usable_mba(cprops)) {
-			r->alloc_capable = true;
-			exposed_alloc_capable = true;
-		}
 	}
 
 	if (r->mon_capable) {
@@ -537,7 +366,6 @@ int mpam_resctrl_setup(void)
 	}
 
 	mpam_resctrl_pick_caches();
-	mpam_resctrl_pick_mba();
 
 	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
 		res = &mpam_resctrl_exports[i];
@@ -596,15 +424,6 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
 	case RDT_RESOURCE_L3:
 		configured_by = mpam_feat_cpor_part;
 		break;
-	case RDT_RESOURCE_MBA:
-		if (mba_class_use_mbw_part(cprops)) {
-			configured_by = mpam_feat_mbw_part;
-			break;
-		} else if (mpam_has_feature(mpam_feat_mbw_max, cprops)) {
-			configured_by = mpam_feat_mbw_max;
-			break;
-		}
-		fallthrough;
 	default:
 		return -EINVAL;
 	}
@@ -617,11 +436,6 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
 	case mpam_feat_cpor_part:
 		/* TODO: Scaling is not yet supported */
 		return cfg->cpbm;
-	case mpam_feat_mbw_part:
-		/* TODO: Scaling is not yet supported */
-		return mbw_pbm_to_percent(cfg->mbw_pbm, cprops);
-	case mpam_feat_mbw_max:
-		return mbw_max_to_percent(cfg->mbw_max, cprops);
 	default:
 		return -EINVAL;
 	}
@@ -630,7 +444,6 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
 int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
 			    u32 closid, enum resctrl_conf_type t, u32 cfg_val)
 {
-	int err;
 	u32 partid;
 	struct mpam_config cfg;
 	struct mpam_props *cprops;
@@ -659,37 +472,11 @@ int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
 		cfg.cpbm = cfg_val;
 		mpam_set_feature(mpam_feat_cpor_part, &cfg);
 		break;
-	case RDT_RESOURCE_MBA:
-		if (mba_class_use_mbw_part(cprops)) {
-			cfg.mbw_pbm = percent_to_mbw_pbm(cfg_val, cprops);
-			mpam_set_feature(mpam_feat_mbw_part, &cfg);
-			break;
-		} else if (mpam_has_feature(mpam_feat_mbw_max, cprops)) {
-			cfg.mbw_max = percent_to_mbw_max(cfg_val, cprops);
-			mpam_set_feature(mpam_feat_mbw_max, &cfg);
-			break;
-		}
-		fallthrough;
 	default:
 		return -EINVAL;
 	}
 
-	/*
-	 * When CDP is enabled, but the resource doesn't support it, we need to
-	 * apply the same configuration to the other partid.
-	 */
-	if (mpam_resctrl_hide_cdp(r->rid)) {
-		partid = resctrl_get_config_index(closid, CDP_CODE);
-		err = mpam_apply_config(dom->comp, partid, &cfg);
-		if (err)
-			return err;
-
-		partid = resctrl_get_config_index(closid, CDP_DATA);
-		return mpam_apply_config(dom->comp, partid, &cfg);
-
-	} else {
-		return mpam_apply_config(dom->comp, partid, &cfg);
-	}
+	return mpam_apply_config(dom->comp, partid, &cfg);
 }
 
 /* TODO: this is IPI heavy */
-- 
Gitee


From 33e4f14a8b4fa50710663fdb9eba5154060bd9aa Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 081/280] anolis: Revert "arm_mpam: resctrl: Add rmid index
 helpers"

ANBZ: #31045

This reverts commit af1a56a71078050575120317685c591a5da14c23.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c | 30 ----------------------------
 include/linux/arm_mpam.h             |  3 ---
 2 files changed, 33 deletions(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 1efefbf1313b..225565ec4b04 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -93,36 +93,6 @@ u32 resctrl_arch_get_num_closid(struct rdt_resource *ignored)
 	return min((u32)mpam_partid_max + 1, (u32)RESCTRL_MAX_CLOSID);
 }
 
-u32 resctrl_arch_system_num_rmid_idx(void)
-{
-	u8 closid_shift = fls(mpam_pmg_max);
-	u32 num_partid = resctrl_arch_get_num_closid(NULL);
-
-	return num_partid << closid_shift;
-}
-
-u32 resctrl_arch_rmid_idx_encode(u32 closid, u32 rmid)
-{
-	u8 closid_shift = fls(mpam_pmg_max);
-
-	if (WARN_ON_ONCE(closid_shift > 8))
-		closid_shift = 8;
-
-	return (closid << closid_shift) | rmid;
-}
-
-void resctrl_arch_rmid_idx_decode(u32 idx, u32 *closid, u32 *rmid)
-{
-	u8 closid_shift = fls(mpam_pmg_max);
-	u32 pmg_mask = ~(~0 << closid_shift);
-
-	if (WARN_ON_ONCE(closid_shift > 8))
-		closid_shift = 8;
-
-	*closid = idx >> closid_shift;
-	*rmid = idx & pmg_mask;
-}
-
 void resctrl_arch_sched_in(struct task_struct *tsk)
 {
 	lockdep_assert_preemption_disabled();
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index d41891df56d4..95a960b6f9d7 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -72,8 +72,5 @@ void resctrl_arch_set_cpu_default_closid(int cpu, u32 closid);
 void resctrl_arch_set_closid_rmid(struct task_struct *tsk, u32 closid, u32 rmid);
 void resctrl_arch_set_cpu_default_closid_rmid(int cpu, u32 closid, u32 pmg);
 void resctrl_arch_sched_in(struct task_struct *tsk);
-u32 resctrl_arch_rmid_idx_encode(u32 closid, u32 rmid);
-void resctrl_arch_rmid_idx_decode(u32 idx, u32 *closid, u32 *rmid);
-u32 resctrl_arch_system_num_rmid_idx(void);
 
 #endif /* __LINUX_ARM_MPAM_H */
-- 
Gitee


From 3d1853d0e04f1af28f5a46a30fe05ed09c20cdc2 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 082/280] anolis: Revert "arm64: mpam: Add helpers to change a
 tasks and cpu mpam partid/pmg values"

ANBZ: #31045

This reverts commit ccbfd7a4a7f1338fe3ea99c11ad8605150f8c4ce.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/arm64/include/asm/mpam.h        | 44 ---------------------
 drivers/platform/mpam/mpam_resctrl.c | 58 ----------------------------
 include/linux/arm_mpam.h             |  7 ----
 3 files changed, 109 deletions(-)

diff --git a/arch/arm64/include/asm/mpam.h b/arch/arm64/include/asm/mpam.h
index 9abe1fe58c34..edae8c98fa28 100644
--- a/arch/arm64/include/asm/mpam.h
+++ b/arch/arm64/include/asm/mpam.h
@@ -6,7 +6,6 @@
 
 #include <linux/arm_mpam.h>
 #include <linux/bitops.h>
-#include <linux/bitfield.h>
 #include <linux/init.h>
 #include <linux/jump_label.h>
 #include <linux/percpu.h>
@@ -91,35 +90,6 @@ static inline void __init __enable_mpam_hcr(void)
  * A value in struct thread_info is used instead of struct task_struct as the
  * cpu's u64 register format is used, but struct task_struct has two u32'.
  */
- static inline void mpam_set_cpu_defaults(int cpu, u16 partid_d, u16 partid_i,
-					  u8 pmg_d, u8 pmg_i)
-{
-	u64 default_val;
-
-	default_val = FIELD_PREP(MPAM_SYSREG_PARTID_D, partid_d);
-	default_val |= FIELD_PREP(MPAM_SYSREG_PARTID_I, partid_i);
-	default_val |= FIELD_PREP(MPAM_SYSREG_PMG_D, pmg_d);
-	default_val |= FIELD_PREP(MPAM_SYSREG_PMG_I, pmg_i);
-
-	WRITE_ONCE(per_cpu(arm64_mpam_default, cpu), default_val);
-}
-
-static inline void mpam_set_task_partid_pmg(struct task_struct *tsk,
-					    u16 partid_d, u16 partid_i,
-					    u8 pmg_d, u8 pmg_i)
-{
-#ifdef CONFIG_ARM64_MPAM
-	u64 regval;
-
-	regval = FIELD_PREP(MPAM_SYSREG_PARTID_D, partid_d);
-	regval |= FIELD_PREP(MPAM_SYSREG_PARTID_I, partid_i);
-	regval |= FIELD_PREP(MPAM_SYSREG_PMG_D, pmg_d);
-	regval |= FIELD_PREP(MPAM_SYSREG_PMG_I, pmg_i);
-
-	WRITE_ONCE(task_thread_info(tsk)->mpam_partid_pmg, regval);
-#endif
-}
-
 static inline u64 mpam_get_regval(struct task_struct *tsk)
 {
 #ifdef CONFIG_ARM64_MPAM
@@ -129,20 +99,6 @@ static inline u64 mpam_get_regval(struct task_struct *tsk)
 #endif
 }
 
-static inline void resctrl_arch_set_rmid(struct task_struct *tsk, u32 rmid)
-{
-#ifdef CONFIG_ARM64_MPAM
-	u64 regval = mpam_get_regval(tsk);
-
-	regval &= ~MPAM_SYSREG_PMG_D;
-	regval &= ~MPAM_SYSREG_PMG_I;
-	regval |= FIELD_PREP(MPAM_SYSREG_PMG_D, rmid);
-	regval |= FIELD_PREP(MPAM_SYSREG_PMG_I, rmid);
-
-	WRITE_ONCE(task_thread_info(tsk)->mpam_partid_pmg, regval);
-#endif
-}
-
 static inline void mpam_thread_switch(struct task_struct *tsk)
 {
 	u64 oldregval;
diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 225565ec4b04..64372f5bf380 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -8,7 +8,6 @@
 #include <linux/cpu.h>
 #include <linux/cpumask.h>
 #include <linux/errno.h>
-#include <linux/limits.h>
 #include <linux/list.h>
 #include <linux/printk.h>
 #include <linux/rculist.h>
@@ -93,63 +92,6 @@ u32 resctrl_arch_get_num_closid(struct rdt_resource *ignored)
 	return min((u32)mpam_partid_max + 1, (u32)RESCTRL_MAX_CLOSID);
 }
 
-void resctrl_arch_sched_in(struct task_struct *tsk)
-{
-	lockdep_assert_preemption_disabled();
-
-	mpam_thread_switch(tsk);
-}
-
-void resctrl_arch_set_cpu_default_closid_rmid(int cpu, u32 closid, u32 pmg)
-{
-	if (WARN_ON_ONCE(closid > U16_MAX) || WARN_ON_ONCE(pmg > U8_MAX))
-		return;
-
-	if (!cdp_enabled) {
-		mpam_set_cpu_defaults(cpu, closid, closid, pmg, pmg);
-	} else {
-		/*
-		 * When CDP is enabled, resctrl halves the closid range and we
-		 * use odd/even partid for one closid.
-		 */
-		u32 partid_d = resctrl_get_config_index(closid, CDP_DATA);
-		u32 partid_i = resctrl_get_config_index(closid, CDP_CODE);
-
-		mpam_set_cpu_defaults(cpu, partid_d, partid_i, pmg, pmg);
-	}
-}
-
-void resctrl_arch_sync_cpu_defaults(void *info)
-{
-	struct resctrl_cpu_sync *r = info;
-
-	lockdep_assert_preemption_disabled();
-
-	if (r) {
-		resctrl_arch_set_cpu_default_closid_rmid(smp_processor_id(),
-							 r->closid, r->rmid);
-	}
-
-	resctrl_arch_sched_in(current);
-}
-
-void resctrl_arch_set_closid_rmid(struct task_struct *tsk, u32 closid, u32 rmid)
-{
-
-
-	if (WARN_ON_ONCE(closid > U16_MAX) || WARN_ON_ONCE(rmid > U8_MAX))
-		return;
-
-	if (!cdp_enabled) {
-		mpam_set_task_partid_pmg(tsk, closid, closid, rmid, rmid);
-	} else {
-		u32 partid_d = resctrl_get_config_index(closid, CDP_DATA);
-		u32 partid_i = resctrl_get_config_index(closid, CDP_CODE);
-
-		mpam_set_task_partid_pmg(tsk, partid_d, partid_i, rmid, rmid);
-	}
-}
-
 bool resctrl_arch_match_closid(struct task_struct *tsk, u32 closid)
 {
 	u64 regval = mpam_get_regval(tsk);
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index 95a960b6f9d7..e3921b0ab836 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -16,8 +16,6 @@
  */
 extern u64 mpam_resctrl_default_group;
 
-#include <asm/mpam.h>
-
 struct mpam_msc;
 
 enum mpam_msc_iface {
@@ -68,9 +66,4 @@ bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level ignored);
 int resctrl_arch_set_cdp_enabled(enum resctrl_res_level ignored, bool enable);
 bool resctrl_arch_match_closid(struct task_struct *tsk, u32 closid);
 bool resctrl_arch_match_rmid(struct task_struct *tsk, u32 closid, u32 rmid);
-void resctrl_arch_set_cpu_default_closid(int cpu, u32 closid);
-void resctrl_arch_set_closid_rmid(struct task_struct *tsk, u32 closid, u32 rmid);
-void resctrl_arch_set_cpu_default_closid_rmid(int cpu, u32 closid, u32 pmg);
-void resctrl_arch_sched_in(struct task_struct *tsk);
-
 #endif /* __LINUX_ARM_MPAM_H */
-- 
Gitee


From 327561a1c999277f6270a2a9f5598de2dc2aac93 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 083/280] anolis: Revert "arm_mpam: resctrl: Add CDP emulation"

ANBZ: #31045

This reverts commit 3744e79894129a12ff494faa1263e31f9bc5bce3.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/arm64/include/asm/mpam.h        |  3 +-
 drivers/platform/mpam/mpam_resctrl.c | 62 ----------------------------
 include/linux/arm_mpam.h             | 13 ------
 3 files changed, 1 insertion(+), 77 deletions(-)

diff --git a/arch/arm64/include/asm/mpam.h b/arch/arm64/include/asm/mpam.h
index edae8c98fa28..1d81a6f26acd 100644
--- a/arch/arm64/include/asm/mpam.h
+++ b/arch/arm64/include/asm/mpam.h
@@ -4,7 +4,6 @@
 #ifndef __ASM__MPAM_H
 #define __ASM__MPAM_H
 
-#include <linux/arm_mpam.h>
 #include <linux/bitops.h>
 #include <linux/init.h>
 #include <linux/jump_label.h>
@@ -109,7 +108,7 @@ static inline void mpam_thread_switch(struct task_struct *tsk)
 	    !static_branch_likely(&mpam_enabled))
 		return;
 
-	if (regval == READ_ONCE(mpam_resctrl_default_group))
+	if (!regval)
 		regval = READ_ONCE(per_cpu(arm64_mpam_default, cpu));
 
 	oldregval = READ_ONCE(per_cpu(arm64_mpam_current, cpu));
diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 64372f5bf380..ebd8aef84679 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -19,8 +19,6 @@
 
 #include "mpam_internal.h"
 
-u64 mpam_resctrl_default_group;
-
 /*
  * The classes we've picked to map to resctrl resources.
  * Class pointer may be NULL.
@@ -31,12 +29,6 @@ static bool exposed_alloc_capable;
 static bool exposed_mon_capable;
 static struct mpam_class *mbm_local_class;
 
-/*
- * MPAM emulates CDP by setting different PARTID in the I/D fields of MPAM1_EL1.
- * This applies globally to all traffic the CPU generates.
- */
-static bool cdp_enabled;
-
 bool resctrl_arch_alloc_capable(void)
 {
 	return exposed_alloc_capable;
@@ -52,36 +44,6 @@ bool resctrl_arch_is_mbm_local_enabled(void)
 	return mbm_local_class;
 }
 
-bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level ignored)
-{
-	return cdp_enabled;
-}
-
-int resctrl_arch_set_cdp_enabled(enum resctrl_res_level ignored, bool enable)
-{
-	u64 regval;
-	u32 partid, partid_i, partid_d;
-
-	cdp_enabled = enable;
-
-	partid = RESCTRL_RESERVED_CLOSID;
-
-	if (enable) {
-		partid_d = resctrl_get_config_index(partid, CDP_CODE);
-		partid_i = resctrl_get_config_index(partid, CDP_DATA);
-		regval = FIELD_PREP(MPAM_SYSREG_PARTID_D, partid_d) |
-			 FIELD_PREP(MPAM_SYSREG_PARTID_I, partid_i);
-
-	} else {
-		regval = FIELD_PREP(MPAM_SYSREG_PARTID_D, partid) |
-			 FIELD_PREP(MPAM_SYSREG_PARTID_I, partid);
-	}
-
-	WRITE_ONCE(mpam_resctrl_default_group, regval);
-
-	return 0;
-}
-
 /*
  * MSC may raise an error interrupt if it sees an out or range partid/pmg,
  * and go on to truncate the value. Regardless of what the hardware supports,
@@ -92,30 +54,6 @@ u32 resctrl_arch_get_num_closid(struct rdt_resource *ignored)
 	return min((u32)mpam_partid_max + 1, (u32)RESCTRL_MAX_CLOSID);
 }
 
-bool resctrl_arch_match_closid(struct task_struct *tsk, u32 closid)
-{
-	u64 regval = mpam_get_regval(tsk);
-	u32 tsk_closid = FIELD_GET(MPAM_SYSREG_PARTID_D, regval);
-
-	if (cdp_enabled)
-		tsk_closid >>= 1;
-
-	return tsk_closid == closid;
-}
-
-/* The task's pmg is not unique, the partid must be considered too */
-bool resctrl_arch_match_rmid(struct task_struct *tsk, u32 closid, u32 rmid)
-{
-	u64 regval = mpam_get_regval(tsk);
-	u32 tsk_closid = FIELD_GET(MPAM_SYSREG_PARTID_D, regval);
-	u32 tsk_rmid = FIELD_GET(MPAM_SYSREG_PMG_D, regval);
-
-	if (cdp_enabled)
-		tsk_closid >>= 1;
-
-	return (tsk_closid == closid) && (tsk_rmid == rmid);
-}
-
 struct rdt_resource *resctrl_arch_get_resource(enum resctrl_res_level l)
 {
 	if (l >= RDT_NUM_RESOURCES)
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index e3921b0ab836..97d4c8f076e4 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -5,17 +5,8 @@
 #define __LINUX_ARM_MPAM_H
 
 #include <linux/acpi.h>
-#include <linux/resctrl_types.h>
 #include <linux/types.h>
 
-/*
- * The value of the MPAM1_EL1 sysreg when a task is in the default group.
- * This is used by the context switch code to use the resctrl CPU property
- * instead. The value is modified when CDP is enabled/disabled by mounting
- * the resctrl filesystem.
- */
-extern u64 mpam_resctrl_default_group;
-
 struct mpam_msc;
 
 enum mpam_msc_iface {
@@ -62,8 +53,4 @@ static inline bool resctrl_arch_is_mbm_total_enabled(void)
 /* reset cached configurations, then all devices */
 void resctrl_arch_reset_resources(void);
 
-bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level ignored);
-int resctrl_arch_set_cdp_enabled(enum resctrl_res_level ignored, bool enable);
-bool resctrl_arch_match_closid(struct task_struct *tsk, u32 closid);
-bool resctrl_arch_match_rmid(struct task_struct *tsk, u32 closid, u32 rmid);
 #endif /* __LINUX_ARM_MPAM_H */
-- 
Gitee


From 3a4d8a8ed32c395cbef1ff7779e96b8db7e17180 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 084/280] anolis: Revert "arm_mpam: resctrl: Implement helpers
 to update configuration"

ANBZ: #31045

This reverts commit ff2893ece6af3ef12a157e29426f1bc2f68de150.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_internal.h |  7 ++-
 drivers/platform/mpam/mpam_resctrl.c  | 65 ---------------------------
 2 files changed, 6 insertions(+), 66 deletions(-)

diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index 36c49cfb9271..612d5f8c0568 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -119,7 +119,12 @@ struct mpam_props
 };
 
 #define mpam_has_feature(_feat, x)	((1<<_feat) & (x)->features)
-#define mpam_set_feature(_feat, x)	((x)->features |= (1<<_feat))
+
+static inline void mpam_set_feature(enum mpam_device_features feat,
+				    struct mpam_props *props)
+{
+	props->features |= (1<<feat);
+}
 
 static inline void mpam_clear_feature(enum mpam_device_features feat,
 				      mpam_features_t *supported)
diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index ebd8aef84679..cda8f08c0819 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -291,71 +291,6 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
 	}
 }
 
-int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
-			    u32 closid, enum resctrl_conf_type t, u32 cfg_val)
-{
-	u32 partid;
-	struct mpam_config cfg;
-	struct mpam_props *cprops;
-	struct mpam_resctrl_res *res;
-	struct mpam_resctrl_dom *dom;
-
-	lockdep_assert_cpus_held();
-	lockdep_assert_irqs_enabled();
-
-	/*
-	 * NOTE: don't check the CPU as mpam_apply_config() doesn't care,
-	 * and resctrl_arch_update_domains() depends on this.
-	 */
-	res = container_of(r, struct mpam_resctrl_res, resctrl_res);
-	dom = container_of(d, struct mpam_resctrl_dom, resctrl_dom);
-	cprops = &res->class->props;
-
-	partid = resctrl_get_config_index(closid, t);
-	if (!r->alloc_capable || partid >= resctrl_arch_get_num_closid(r))
-		return -EINVAL;
-
-	switch (r->rid) {
-	case RDT_RESOURCE_L2:
-	case RDT_RESOURCE_L3:
-		/* TODO: Scaling is not yet supported */
-		cfg.cpbm = cfg_val;
-		mpam_set_feature(mpam_feat_cpor_part, &cfg);
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	return mpam_apply_config(dom->comp, partid, &cfg);
-}
-
-/* TODO: this is IPI heavy */
-int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
-{
-	int err = 0;
-	struct rdt_domain *d;
-	enum resctrl_conf_type t;
-	struct resctrl_staged_config *cfg;
-
-	lockdep_assert_cpus_held();
-	lockdep_assert_irqs_enabled();
-
-	list_for_each_entry(d, &r->domains, list) {
-		for (t = 0; t < CDP_NUM_TYPES; t++) {
-			cfg = &d->staged_config[t];
-			if (!cfg->have_new_ctrl)
-				continue;
-
-			err = resctrl_arch_update_one(r, d, closid, t,
-						      cfg->new_ctrl);
-			if (err)
-				return err;
-		}
-	}
-
-	return err;
-}
-
 void resctrl_arch_reset_resources(void)
 {
 	int i, idx;
-- 
Gitee


From 31b1c629dbe3b95045fad2ed91f39d0a60dc76b3 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 085/280] anolis: Revert "arm_mpam: resctrl: Add
 resctrl_arch_get_config()"

ANBZ: #31045

This reverts commit aade81099c3d06b9b9904bde1fc9b686f6827500.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c |  3 --
 drivers/platform/mpam/mpam_resctrl.c | 44 ----------------------------
 2 files changed, 47 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 5ebb944ad9fc..13f48878c3d5 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -2302,9 +2302,6 @@ int mpam_apply_config(struct mpam_component *comp, u16 partid,
 
 	lockdep_assert_cpus_held();
 
-	if (!memcmp(&comp->cfg[partid], cfg, sizeof(*cfg)))
-		return 0;
-
 	comp->cfg[partid] = *cfg;
 	arg.comp = comp;
 	arg.partid = partid;
diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index cda8f08c0819..82325956a938 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -247,50 +247,6 @@ int mpam_resctrl_setup(void)
 	return err;
 }
 
-u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
-			    u32 closid, enum resctrl_conf_type type)
-{
-	u32 partid;
-	struct mpam_config *cfg;
-	struct mpam_props *cprops;
-	struct mpam_resctrl_res *res;
-	struct mpam_resctrl_dom *dom;
-	enum mpam_device_features configured_by;
-
-	lockdep_assert_cpus_held();
-
-	if (!mpam_is_enabled())
-		return r->default_ctrl;
-
-	res = container_of(r, struct mpam_resctrl_res, resctrl_res);
-	dom = container_of(d, struct mpam_resctrl_dom, resctrl_dom);
-	cprops = &res->class->props;
-
-	partid = resctrl_get_config_index(closid, type);
-	cfg = &dom->comp->cfg[partid];
-
-	switch (r->rid) {
-	case RDT_RESOURCE_L2:
-	case RDT_RESOURCE_L3:
-		configured_by = mpam_feat_cpor_part;
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	if (!r->alloc_capable || partid >= resctrl_arch_get_num_closid(r) ||
-	    !mpam_has_feature(configured_by, cfg))
-		return r->default_ctrl;
-
-	switch (configured_by) {
-	case mpam_feat_cpor_part:
-		/* TODO: Scaling is not yet supported */
-		return cfg->cpbm;
-	default:
-		return -EINVAL;
-	}
-}
-
 void resctrl_arch_reset_resources(void)
 {
 	int i, idx;
-- 
Gitee


From d0f309c9b6ae6f9bddadf147a7ab8f1af3367951 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 086/280] anolis: Revert "arm_mpam: resctrl: Implement
 resctrl_arch_reset_resources()"

ANBZ: #31045

This reverts commit f74eccd1dac9b48fea16c9aa9828e8163febb384.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  |  2 +-
 drivers/platform/mpam/mpam_internal.h |  2 --
 drivers/platform/mpam/mpam_resctrl.c  | 27 ---------------------------
 include/linux/arm_mpam.h              |  3 ---
 4 files changed, 1 insertion(+), 33 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 13f48878c3d5..28f6010df6dc 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -2177,7 +2177,7 @@ static void mpam_enable_once(void)
 		READ_ONCE(mpam_partid_max) + 1, mpam_pmg_max + 1);
 }
 
-void mpam_reset_class(struct mpam_class *class)
+static void mpam_reset_class(struct mpam_class *class)
 {
 	int idx;
 	struct mpam_msc_ris *ris;
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index 612d5f8c0568..c9d9abb87cff 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -293,8 +293,6 @@ extern u8 mpam_pmg_max;
 void mpam_enable(struct work_struct *work);
 void mpam_disable(struct work_struct *work);
 
-void mpam_reset_class(struct mpam_class *class);
-
 int mpam_apply_config(struct mpam_component *comp, u16 partid,
 		      struct mpam_config *cfg);
 
diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index 82325956a938..f71f8c466817 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -247,33 +247,6 @@ int mpam_resctrl_setup(void)
 	return err;
 }
 
-void resctrl_arch_reset_resources(void)
-{
-	int i, idx;
-	struct mpam_class *class;
-	struct mpam_resctrl_res *res;
-
-	lockdep_assert_cpus_held();
-
-	if (!mpam_is_enabled())
-		return;
-
-	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
-		res = &mpam_resctrl_exports[i];
-
-		if (!res->class)
-			continue;	// dummy resource
-
-		if (!res->resctrl_res.alloc_capable)
-			continue;
-
-		idx = srcu_read_lock(&mpam_srcu);
-		list_for_each_entry_rcu(class, &mpam_classes, classes_list)
-			mpam_reset_class(class);
-		srcu_read_unlock(&mpam_srcu, idx);
-	}
-}
-
 static struct mpam_resctrl_dom *
 mpam_resctrl_alloc_domain(unsigned int cpu, struct mpam_resctrl_res *res)
 {
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index 97d4c8f076e4..576bb97fa552 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -50,7 +50,4 @@ static inline bool resctrl_arch_is_mbm_total_enabled(void)
 	return false;
 }
 
-/* reset cached configurations, then all devices */
-void resctrl_arch_reset_resources(void);
-
 #endif /* __LINUX_ARM_MPAM_H */
-- 
Gitee


From 7ebf643797c9da05f4a0f5cee2bd264713369646 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 087/280] anolis: Revert "arm_mpam: resctrl: Pick a value for
 num_rmid"

ANBZ: #31045

This reverts commit 205ad25c95f33c9fdfb9cf5bc74c59262e4c3bf9.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c | 18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index f71f8c466817..d294db50a651 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -180,22 +180,10 @@ static int mpam_resctrl_resource_init(struct mpam_resctrl_res *res)
 			exposed_alloc_capable = true;
 		}
 
-		if (class->level == 3 && cache_has_usable_csu(class))
+		if (class->level == 3 && cache_has_usable_csu(class)) {
 			r->mon_capable = true;
-	}
-
-	if (r->mon_capable) {
-		exposed_mon_capable = true;
-
-		/*
-		 * Unfortunately, num_rmid doesn't mean anything for
-		 * mpam, and its exposed to user-space!
-		 * num-rmid is supposed to mean the number of groups
-		 * that can be created, both control or monitor groups.
-		 * For mpam, each control group has its own pmg/rmid
-		 * space.
-		 */
-		r->num_rmid = 1;
+			exposed_mon_capable = true;
+		}
 	}
 
 	return 0;
-- 
Gitee


From 962f94e9350a998cef0ee4cc7f945b68884a4753 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 088/280] anolis: Revert "arm_mpam: resctrl: Pick the caches we
 will use as resctrl resources"

ANBZ: #31045

This reverts commit 643f32ba32c48b26571138febe759019cc532cee.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_resctrl.c | 134 +--------------------------
 include/linux/arm_mpam.h             |   7 --
 2 files changed, 4 insertions(+), 137 deletions(-)

diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
index d294db50a651..b9c1292ff630 100644
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ b/drivers/platform/mpam/mpam_resctrl.c
@@ -27,7 +27,6 @@ static struct mpam_resctrl_res mpam_resctrl_exports[RDT_NUM_RESOURCES];
 
 static bool exposed_alloc_capable;
 static bool exposed_mon_capable;
-static struct mpam_class *mbm_local_class;
 
 bool resctrl_arch_alloc_capable(void)
 {
@@ -39,11 +38,6 @@ bool resctrl_arch_mon_capable(void)
 	return exposed_mon_capable;
 }
 
-bool resctrl_arch_is_mbm_local_enabled(void)
-{
-	return mbm_local_class;
-}
-
 /*
  * MSC may raise an error interrupt if it sees an out or range partid/pmg,
  * and go on to truncate the value. Regardless of what the hardware supports,
@@ -62,133 +56,14 @@ struct rdt_resource *resctrl_arch_get_resource(enum resctrl_res_level l)
 	return &mpam_resctrl_exports[l].resctrl_res;
 }
 
-static bool cache_has_usable_cpor(struct mpam_class *class)
-{
-	struct mpam_props *cprops = &class->props;
-
-	if (!mpam_has_feature(mpam_feat_cpor_part, cprops))
-		return false;
-
-	/* TODO: Scaling is not yet supported */
-	return (class->props.cpbm_wd <= RESCTRL_MAX_CBM);
-}
-
-static bool cache_has_usable_csu(struct mpam_class *class)
-{
-	struct mpam_props *cprops;
-
-	if (!class)
-		return false;
-
-	cprops = &class->props;
-
-	if (!mpam_has_feature(mpam_feat_msmon_csu, cprops))
-		return false;
-
-	/*
-	 * CSU counters settle on the value, so we can get away with
-	 * having only one.
-	 */
-	if (!cprops->num_csu_mon)
-		return false;
-
-	return (mpam_partid_max > 1) || (mpam_pmg_max != 0);
-}
-
-bool resctrl_arch_is_llc_occupancy_enabled(void)
-{
-	return cache_has_usable_csu(mpam_resctrl_exports[RDT_RESOURCE_L3].class);
-}
-
-/* Test whether we can export MPAM_CLASS_CACHE:{2,3}? */
-static void mpam_resctrl_pick_caches(void)
-{
-	int idx;
-	struct mpam_class *class;
-	struct mpam_resctrl_res *res;
-
-	idx = srcu_read_lock(&mpam_srcu);
-	list_for_each_entry_rcu(class, &mpam_classes, classes_list) {
-		bool has_cpor = cache_has_usable_cpor(class);
-
-		if (class->type != MPAM_CLASS_CACHE) {
-			pr_debug("pick_caches: Class is not a cache\n");
-			continue;
-		}
-
-		if (class->level != 2 && class->level != 3) {
-			pr_debug("pick_caches: not L2 or L3\n");
-			continue;
-		}
-
-		if (class->level == 2 && !has_cpor) {
-			pr_debug("pick_caches: L2 missing CPOR\n");
-			continue;
-		} else if (!has_cpor && !cache_has_usable_csu(class)) {
-			pr_debug("pick_caches: Cache misses CPOR and CSU\n");
-			continue;
-		}
-
-		if (!cpumask_equal(&class->affinity, cpu_possible_mask)) {
-			pr_debug("pick_caches: Class has missing CPUs\n");
-			continue;
-		}
-
-		if (class->level == 2) {
-			res = &mpam_resctrl_exports[RDT_RESOURCE_L2];
-			res->resctrl_res.name = "L2";
-		} else {
-			res = &mpam_resctrl_exports[RDT_RESOURCE_L3];
-			res->resctrl_res.name = "L3";
-		}
-		res->class = class;
-	}
-	srcu_read_unlock(&mpam_srcu, idx);
-}
-
 static int mpam_resctrl_resource_init(struct mpam_resctrl_res *res)
 {
-	struct mpam_class *class = res->class;
-	struct rdt_resource *r = &res->resctrl_res;
-
-	/* Is this one of the two well-known caches? */
-	if (res->resctrl_res.rid == RDT_RESOURCE_L2 ||
-	    res->resctrl_res.rid == RDT_RESOURCE_L3) {
-		/* TODO: Scaling is not yet supported */
-		r->cache.cbm_len = class->props.cpbm_wd;
-		r->cache.arch_has_sparse_bitmasks = true;
-
-		/* mpam_devices will reject empty bitmaps */
-		r->cache.min_cbm_bits = 1;
-
-		/* TODO: kill these properties off as they are derivatives */
-		r->format_str = "%d=%0*x";
-		r->fflags = RFTYPE_RES_CACHE;
-		r->default_ctrl = BIT_MASK(class->props.cpbm_wd) - 1;
-		r->data_width = (class->props.cpbm_wd + 3) / 4;
-
-		/*
-		 * Which bits are shared with other ...things...
-		 * Unknown devices use partid-0 which uses all the bitmap
-		 * fields. Until we configured the SMMU and GIC not to do this
-		 * 'all the bits' is the correct answer here.
-		 */
-		r->cache.shareable_bits = r->default_ctrl;
-
-		if (mpam_has_feature(mpam_feat_cpor_part, &class->props)) {
-			r->alloc_capable = true;
-			exposed_alloc_capable = true;
-		}
-
-		if (class->level == 3 && cache_has_usable_csu(class)) {
-			r->mon_capable = true;
-			exposed_mon_capable = true;
-		}
-	}
+	/* TODO: initialise the resctrl resources */
 
 	return 0;
 }
 
+/* Called with the mpam classes lock held */
 int mpam_resctrl_setup(void)
 {
 	int err = 0;
@@ -203,7 +78,7 @@ int mpam_resctrl_setup(void)
 		res->resctrl_res.rid = i;
 	}
 
-	mpam_resctrl_pick_caches();
+	/* TODO: pick MPAM classes to map to resctrl resources */
 
 	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
 		res = &mpam_resctrl_exports[i];
@@ -228,8 +103,7 @@ int mpam_resctrl_setup(void)
 			 */
 			pr_warn("Number of PMG is not a power of 2! resctrl may misbehave");
 		}
-
-		/* TODO: call resctrl_init() */
+		err = resctrl_init();
 	}
 
 	return err;
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index 576bb97fa552..27c3ad9912ef 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -42,12 +42,5 @@ int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
 
 bool resctrl_arch_alloc_capable(void);
 bool resctrl_arch_mon_capable(void);
-bool resctrl_arch_is_llc_occupancy_enabled(void);
-bool resctrl_arch_is_mbm_local_enabled(void);
-
-static inline bool resctrl_arch_is_mbm_total_enabled(void)
-{
-	return false;
-}
 
 #endif /* __LINUX_ARM_MPAM_H */
-- 
Gitee


From 84905552923d563cb1618846a7a713e649a2b5f8 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:43:52 -0800
Subject: [PATCH 089/280] anolis: Revert "arm_mpam: resctrl: Add boilerplate
 cpuhp and domain allocation"

ANBZ: #31045

This reverts commit af0e625adc981d1a3ada7824fd17bc7d51f3a29b.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/Makefile        |   2 +-
 drivers/platform/mpam/mpam_devices.c  |  12 --
 drivers/platform/mpam/mpam_internal.h |  15 --
 drivers/platform/mpam/mpam_resctrl.c  | 237 --------------------------
 include/linux/arm_mpam.h              |   4 -
 5 files changed, 1 insertion(+), 269 deletions(-)
 delete mode 100644 drivers/platform/mpam/mpam_resctrl.c

diff --git a/drivers/platform/mpam/Makefile b/drivers/platform/mpam/Makefile
index 37693be531c3..8ad69bfa2aa2 100644
--- a/drivers/platform/mpam/Makefile
+++ b/drivers/platform/mpam/Makefile
@@ -1 +1 @@
-obj-$(CONFIG_ARM_CPU_RESCTRL) += mpam_devices.o mpam_resctrl.o
+obj-$(CONFIG_ARM_CPU_RESCTRL) += mpam_devices.o
diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 28f6010df6dc..f9f22d1d698c 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -1411,9 +1411,6 @@ static int mpam_cpu_online(unsigned int cpu)
 	}
 	srcu_read_unlock(&mpam_srcu, idx);
 
-	if (mpam_is_enabled())
-		mpam_resctrl_online_cpu(cpu);
-
 	return 0;
 }
 
@@ -1473,9 +1470,6 @@ static int mpam_cpu_offline(unsigned int cpu)
 	}
 	srcu_read_unlock(&mpam_srcu, idx);
 
-	if (mpam_is_enabled())
-		mpam_resctrl_offline_cpu(cpu);
-
 	return 0;
 }
 
@@ -2146,12 +2140,6 @@ static void mpam_enable_once(void)
 	mutex_unlock(&mpam_list_lock);
 	cpus_read_unlock();
 
-	if (!err) {
-		err = mpam_resctrl_setup();
-		if (err)
-			pr_err("Failed to initialise resctrl: %d\n", err);
-	}
-
 	if (err) {
 		schedule_work(&mpam_broken_work);
 		return;
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index c9d9abb87cff..3f9478c90faf 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -239,16 +239,6 @@ struct mpam_msc_ris {
 	struct msmon_mbwu_state	*mbwu_state;
 };
 
-struct mpam_resctrl_dom {
-	struct mpam_component	*comp;
-	struct rdt_domain	resctrl_dom;
-};
-
-struct mpam_resctrl_res {
-	struct mpam_class	*class;
-	struct rdt_resource	resctrl_res;
-};
-
 static inline int mpam_alloc_csu_mon(struct mpam_class *class)
 {
 	struct mpam_props *cprops = &class->props;
@@ -300,11 +290,6 @@ int mpam_msmon_read(struct mpam_component *comp, struct mon_cfg *ctx,
 		    enum mpam_device_features, u64 *val);
 void mpam_msmon_reset_mbwu(struct mpam_component *comp, struct mon_cfg *ctx);
 
-int mpam_resctrl_online_cpu(unsigned int cpu);
-int mpam_resctrl_offline_cpu(unsigned int cpu);
-
-int mpam_resctrl_setup(void);
-
 /*
  * MPAM MSCs have the following register layout. See:
  * Arm Architecture Reference Manual Supplement - Memory System Resource
diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c
deleted file mode 100644
index b9c1292ff630..000000000000
--- a/drivers/platform/mpam/mpam_resctrl.c
+++ /dev/null
@@ -1,237 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2021 Arm Ltd.
-
-#define pr_fmt(fmt) "mpam: resctrl: " fmt
-
-#include <linux/arm_mpam.h>
-#include <linux/cacheinfo.h>
-#include <linux/cpu.h>
-#include <linux/cpumask.h>
-#include <linux/errno.h>
-#include <linux/list.h>
-#include <linux/printk.h>
-#include <linux/rculist.h>
-#include <linux/resctrl.h>
-#include <linux/slab.h>
-#include <linux/types.h>
-
-#include <asm/mpam.h>
-
-#include "mpam_internal.h"
-
-/*
- * The classes we've picked to map to resctrl resources.
- * Class pointer may be NULL.
- */
-static struct mpam_resctrl_res mpam_resctrl_exports[RDT_NUM_RESOURCES];
-
-static bool exposed_alloc_capable;
-static bool exposed_mon_capable;
-
-bool resctrl_arch_alloc_capable(void)
-{
-	return exposed_alloc_capable;
-}
-
-bool resctrl_arch_mon_capable(void)
-{
-	return exposed_mon_capable;
-}
-
-/*
- * MSC may raise an error interrupt if it sees an out or range partid/pmg,
- * and go on to truncate the value. Regardless of what the hardware supports,
- * only the system wide safe value is safe to use.
- */
-u32 resctrl_arch_get_num_closid(struct rdt_resource *ignored)
-{
-	return min((u32)mpam_partid_max + 1, (u32)RESCTRL_MAX_CLOSID);
-}
-
-struct rdt_resource *resctrl_arch_get_resource(enum resctrl_res_level l)
-{
-	if (l >= RDT_NUM_RESOURCES)
-		return NULL;
-
-	return &mpam_resctrl_exports[l].resctrl_res;
-}
-
-static int mpam_resctrl_resource_init(struct mpam_resctrl_res *res)
-{
-	/* TODO: initialise the resctrl resources */
-
-	return 0;
-}
-
-/* Called with the mpam classes lock held */
-int mpam_resctrl_setup(void)
-{
-	int err = 0;
-	struct mpam_resctrl_res *res;
-	enum resctrl_res_level i;
-
-	cpus_read_lock();
-	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
-		res = &mpam_resctrl_exports[i];
-		INIT_LIST_HEAD(&res->resctrl_res.domains);
-		INIT_LIST_HEAD(&res->resctrl_res.evt_list);
-		res->resctrl_res.rid = i;
-	}
-
-	/* TODO: pick MPAM classes to map to resctrl resources */
-
-	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
-		res = &mpam_resctrl_exports[i];
-		if (!res->class)
-			continue;	// dummy resource
-
-		err = mpam_resctrl_resource_init(res);
-		if (err)
-			break;
-	}
-	cpus_read_unlock();
-
-	if (!err && !exposed_alloc_capable && !exposed_mon_capable)
-		err = -EOPNOTSUPP;
-
-	if (!err) {
-		if (!is_power_of_2(mpam_pmg_max + 1)) {
-			/*
-			 * If not all the partid*pmg values are valid indexes,
-			 * resctrl may allocate pmg that don't exist. This
-			 * should cause an error interrupt.
-			 */
-			pr_warn("Number of PMG is not a power of 2! resctrl may misbehave");
-		}
-		err = resctrl_init();
-	}
-
-	return err;
-}
-
-static struct mpam_resctrl_dom *
-mpam_resctrl_alloc_domain(unsigned int cpu, struct mpam_resctrl_res *res)
-{
-	struct mpam_resctrl_dom *dom;
-	struct mpam_class *class = res->class;
-	struct mpam_component *comp_iter, *comp;
-
-	comp = NULL;
-	list_for_each_entry(comp_iter, &class->components, class_list) {
-		if (cpumask_test_cpu(cpu, &comp_iter->affinity)) {
-			comp = comp_iter;
-			break;
-		}
-	}
-
-	/* cpu with unknown exported component? */
-	if (WARN_ON_ONCE(!comp))
-		return ERR_PTR(-EINVAL);
-
-	dom = kzalloc_node(sizeof(*dom), GFP_KERNEL, cpu_to_node(cpu));
-	if (!dom)
-		return ERR_PTR(-ENOMEM);
-
-	dom->comp = comp;
-	INIT_LIST_HEAD(&dom->resctrl_dom.list);
-	dom->resctrl_dom.id = comp->comp_id;
-	cpumask_set_cpu(cpu, &dom->resctrl_dom.cpu_mask);
-
-	/* TODO: this list should be sorted */
-	list_add_tail(&dom->resctrl_dom.list, &res->resctrl_res.domains);
-
-	return dom;
-}
-
-/* Like resctrl_get_domain_from_cpu(), but for offline CPUs */
-static struct mpam_resctrl_dom *
-mpam_get_domain_from_cpu(int cpu, struct mpam_resctrl_res *res)
-{
-	struct rdt_domain *d;
-	struct mpam_resctrl_dom *dom;
-
-	lockdep_assert_cpus_held();
-
-	list_for_each_entry(d, &res->resctrl_res.domains, list) {
-		dom = container_of(d, struct mpam_resctrl_dom, resctrl_dom);
-
-		if (cpumask_test_cpu(cpu, &dom->comp->affinity))
-			return dom;
-	}
-
-	return NULL;
-}
-
-struct rdt_domain *resctrl_arch_find_domain(struct rdt_resource *r, int id)
-{
-	struct rdt_domain *d;
-	struct mpam_resctrl_dom *dom;
-
-	lockdep_assert_cpus_held();
-
-	list_for_each_entry(d, &r->domains, list) {
-		dom = container_of(d, struct mpam_resctrl_dom, resctrl_dom);
-		if (dom->comp->comp_id == id)
-			return &dom->resctrl_dom;
-	}
-
-	return NULL;
-}
-
-int mpam_resctrl_online_cpu(unsigned int cpu)
-{
-	int i;
-	struct mpam_resctrl_dom *dom;
-	struct mpam_resctrl_res *res;
-
-	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
-		res = &mpam_resctrl_exports[i];
-
-		if (!res->class)
-			continue;	// dummy_resource;
-
-		dom = mpam_get_domain_from_cpu(cpu, res);
-		if (dom) {
-			cpumask_set_cpu(cpu, &dom->resctrl_dom.cpu_mask);
-			continue;
-		}
-
-		dom = mpam_resctrl_alloc_domain(cpu, res);
-		if (IS_ERR(dom))
-			return PTR_ERR(dom);
-	}
-
-	return 0;
-}
-
-int mpam_resctrl_offline_cpu(unsigned int cpu)
-{
-	int i;
-	struct rdt_domain *d;
-	struct mpam_resctrl_res *res;
-	struct mpam_resctrl_dom *dom;
-
-	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
-		res = &mpam_resctrl_exports[i];
-
-		if (!res->class)
-			continue;	// dummy resource
-
-		d = resctrl_get_domain_from_cpu(cpu, &res->resctrl_res);
-		dom = container_of(d, struct mpam_resctrl_dom, resctrl_dom);
-
-		/* The last one standing was ahead of us... */
-		if (WARN_ON_ONCE(!d))
-			continue;
-
-		cpumask_clear_cpu(cpu, &d->cpu_mask);
-
-		if (!cpumask_empty(&d->cpu_mask))
-			continue;
-
-		list_del(&d->list);
-		kfree(dom);
-	}
-
-	return 0;
-}
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index 27c3ad9912ef..40e09b4d236b 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -39,8 +39,4 @@ int mpam_register_requestor(u16 partid_max, u8 pmg_max);
 int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
 		    enum mpam_class_types type, u8 class_id, int component_id);
 
-
-bool resctrl_arch_alloc_capable(void);
-bool resctrl_arch_mon_capable(void);
-
 #endif /* __LINUX_ARM_MPAM_H */
-- 
Gitee


From 2c486c0928bbf814fd6459d477fed3ac21e29916 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 090/280] anolis: Revert "arm_mpam: Add helper to reset saved
 mbwu state"

ANBZ: #31045

This reverts commit f9b460fae0521518794a2e5bc62818a1f42b7505.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 44 ++++-----------------------
 drivers/platform/mpam/mpam_internal.h |  5 +--
 2 files changed, 7 insertions(+), 42 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index f9f22d1d698c..7f1f848281be 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -919,11 +919,9 @@ static void __ris_msmon_read(void *arg)
 {
 	bool nrdy = false;
 	unsigned long flags;
-	bool config_mismatch;
 	struct mon_read *m = arg;
 	u64 now, overflow_val = 0;
 	struct mon_cfg *ctx = m->ctx;
-	bool reset_on_next_read = false;
 	struct mpam_msc_ris *ris = m->ris;
 	struct mpam_msc *msc = m->ris->msc;
 	struct msmon_mbwu_state *mbwu_state;
@@ -936,24 +934,13 @@ static void __ris_msmon_read(void *arg)
 		  FIELD_PREP(MSMON_CFG_MON_SEL_RIS, ris->ris_idx);
 	mpam_write_monsel_reg(msc, CFG_MON_SEL, mon_sel);
 
-	if (m->type == mpam_feat_msmon_mbwu) {
-		mbwu_state = &ris->mbwu_state[ctx->mon];
-		if (mbwu_state) {
-			reset_on_next_read = mbwu_state->reset_on_next_read;
-			mbwu_state->reset_on_next_read = false;
-		}
-	}
-
 	/*
 	 * Read the existing configuration to avoid re-writing the same values.
 	 * This saves waiting for 'nrdy' on subsequent reads.
 	 */
 	read_msmon_ctl_flt_vals(m, &cur_ctl, &cur_flt);
 	gen_msmon_ctl_flt_vals(m, &ctl_val, &flt_val);
-	config_mismatch = cur_flt != flt_val ||
-			  cur_ctl != (ctl_val | MSMON_CFG_x_CTL_EN);
-
-	if (config_mismatch || reset_on_next_read)
+	if (cur_flt != flt_val || cur_ctl != (ctl_val | MSMON_CFG_x_CTL_EN))
 		write_msmon_ctl_flt_vals(m, ctl_val, flt_val);
 
 	switch (m->type) {
@@ -983,6 +970,7 @@ static void __ris_msmon_read(void *arg)
 		if (nrdy)
 			break;
 
+		mbwu_state = &ris->mbwu_state[ctx->mon];
 		if (!mbwu_state)
 			break;
 
@@ -1076,30 +1064,6 @@ int mpam_msmon_read(struct mpam_component *comp, struct mon_cfg *ctx,
 	return err;
 }
 
-void mpam_msmon_reset_mbwu(struct mpam_component *comp, struct mon_cfg *ctx)
-{
-	int idx;
-	unsigned long flags;
-	struct mpam_msc *msc;
-	struct mpam_msc_ris *ris;
-
-	if (!mpam_is_enabled())
-		return;
-
-	idx = srcu_read_lock(&mpam_srcu);
-	list_for_each_entry_rcu(ris, &comp->ris, comp_list) {
-		if (!mpam_has_feature(mpam_feat_msmon_mbwu, &ris->props))
-			continue;
-
-		msc = ris->msc;
-		spin_lock_irqsave(&msc->mon_sel_lock, flags);
-		ris->mbwu_state[ctx->mon].correction = 0;
-		ris->mbwu_state[ctx->mon].reset_on_next_read = true;
-		spin_unlock_irqrestore(&msc->mon_sel_lock, flags);
-	}
-	srcu_read_unlock(&mpam_srcu, idx);
-}
-
 static void mpam_reset_msc_bitmap(struct mpam_msc *msc, u16 reg, u16 wd)
 {
 	u32 num_words, msb;
@@ -1226,6 +1190,8 @@ static int mpam_restore_mbwu_state(void *_ris)
 	struct mon_read mwbu_arg;
 	struct mpam_msc_ris *ris = _ris;
 
+	lockdep_assert_held(&ris->msc->lock);
+
 	for (i = 0; i < ris->props.num_mbwu_mon; i++) {
 		if (ris->mbwu_state[i].enabled) {
 			mwbu_arg.ris = ris;
@@ -1250,6 +1216,8 @@ static int mpam_save_mbwu_state(void *arg)
 	struct mpam_msc *msc = ris->msc;
 	struct msmon_mbwu_state *mbwu_state;
 
+	lockdep_assert_held(&msc->lock);
+
 	for (i = 0; i < ris->props.num_mbwu_mon; i++) {
 		mbwu_state = &ris->mbwu_state[i];
 		cfg = &mbwu_state->cfg;
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index 3f9478c90faf..cafcce3e9efb 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -199,12 +199,10 @@ struct mon_cfg {
 
 /*
  * Changes to enabled and cfg are protected by the msc->lock.
- * Changes to reset_on_next_read, prev_val and correction are protected by the
- * msc's mon_sel_lock.
+ * Changes to prev_val and correction are protected by the msc's mon_sel_lock.
  */
 struct msmon_mbwu_state {
 	bool		enabled;
-	bool		reset_on_next_read;
 	struct mon_cfg	cfg;
 
 	/* The value last read from the hardware. Used to detect overflow. */
@@ -288,7 +286,6 @@ int mpam_apply_config(struct mpam_component *comp, u16 partid,
 
 int mpam_msmon_read(struct mpam_component *comp, struct mon_cfg *ctx,
 		    enum mpam_device_features, u64 *val);
-void mpam_msmon_reset_mbwu(struct mpam_component *comp, struct mon_cfg *ctx);
 
 /*
  * MPAM MSCs have the following register layout. See:
-- 
Gitee


From 3a210bafd7000fb6d928e79b454c582ea882ed14 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 091/280] anolis: Revert "arm_mpam: Use long MBWU counters if
 supported"

ANBZ: #31045

This reverts commit bd889c51c020c81b83588819c0827753381d7217.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 86 +++------------------------
 drivers/platform/mpam/mpam_internal.h |  7 +--
 2 files changed, 9 insertions(+), 84 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 7f1f848281be..c2c5dfa77083 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -772,48 +772,6 @@ struct mon_read
 	int				err;
 };
 
-static bool mpam_ris_has_mbwu_long_counter(struct mpam_msc_ris *ris)
-{
-	return (mpam_has_feature(mpam_feat_msmon_mbwu_63counter, &ris->props) ||
-		mpam_has_feature(mpam_feat_msmon_mbwu_44counter, &ris->props));
-}
-
-static u64 mpam_msc_read_mbwu_l(struct mpam_msc *msc)
-{
-	int retry = 3;
-	u32 mbwu_l_low;
-	u64 mbwu_l_high1, mbwu_l_high2;
-
-	lockdep_assert_held_once(&msc->mon_sel_lock);
-
-	WARN_ON_ONCE((MSMON_MBWU_L + sizeof(u64)) > msc->mapped_hwpage_sz);
-	WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(), &msc->accessibility));
-
-	mbwu_l_high2 = readl_relaxed(msc->mapped_hwpage + MSMON_MBWU_L + 4);
-	do {
-		mbwu_l_high1 = mbwu_l_high2;
-		mbwu_l_low = readl_relaxed(msc->mapped_hwpage + MSMON_MBWU_L);
-		mbwu_l_high2 = readl_relaxed(msc->mapped_hwpage + MSMON_MBWU_L + 4);
-
-		retry--;
-	} while (mbwu_l_high1 != mbwu_l_high2 && retry > 0);
-
-	if (mbwu_l_high2 == mbwu_l_high1)
-		return (mbwu_l_high1 << 32) | mbwu_l_low;
-	return MSMON___NRDY_L;
-}
-
-static void mpam_msc_zero_mbwu_l(struct mpam_msc *msc)
-{
-	lockdep_assert_held_once(&msc->mon_sel_lock);
-
-	WARN_ON_ONCE((MSMON_MBWU_L + sizeof(u64)) > msc->mapped_hwpage_sz);
-	WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(), &msc->accessibility));
-
-	writel_relaxed(0, msc->mapped_hwpage + MSMON_MBWU_L);
-	writel_relaxed(0, msc->mapped_hwpage + MSMON_MBWU_L + 4);
-}
-
 static void gen_msmon_ctl_flt_vals(struct mon_read *m, u32 *ctl_val,
 				   u32 *flt_val)
 {
@@ -886,12 +844,7 @@ static void write_msmon_ctl_flt_vals(struct mon_read *m, u32 ctl_val,
 	case mpam_feat_msmon_mbwu:
 		mpam_write_monsel_reg(msc, CFG_MBWU_FLT, flt_val);
 		mpam_write_monsel_reg(msc, CFG_MBWU_CTL, ctl_val);
-
-		if (mpam_ris_has_mbwu_long_counter(m->ris))
-			mpam_msc_zero_mbwu_l(m->ris->msc);
-		else
-			mpam_write_monsel_reg(msc, MBWU, 0);
-
+		mpam_write_monsel_reg(msc, MBWU, 0);
 		mpam_write_monsel_reg(msc, CFG_MBWU_CTL, ctl_val|MSMON_CFG_x_CTL_EN);
 
 		mbwu_state = &m->ris->mbwu_state[m->ctx->mon];
@@ -906,13 +859,8 @@ static void write_msmon_ctl_flt_vals(struct mon_read *m, u32 ctl_val,
 
 static u64 mpam_msmon_overflow_val(struct mpam_msc_ris *ris)
 {
-	/* TODO: implement scaling counters */
-	if (mpam_has_feature(mpam_feat_msmon_mbwu_63counter, &ris->props))
-		return GENMASK_ULL(62, 0);
-	else if (mpam_has_feature(mpam_feat_msmon_mbwu_44counter, &ris->props))
-		return GENMASK_ULL(43, 0);
-	else
-		return GENMASK_ULL(30, 0);
+	/* TODO: scaling, and long counters */
+	return GENMASK_ULL(30, 0);
 }
 
 static void __ris_msmon_read(void *arg)
@@ -950,22 +898,9 @@ static void __ris_msmon_read(void *arg)
 		now = FIELD_GET(MSMON___VALUE, now);
 		break;
 	case mpam_feat_msmon_mbwu:
-		/*
-		 * If long or lwd counters are supported, use them, else revert
-		 * to the 32 bit counter.
-		 */
-		if (mpam_ris_has_mbwu_long_counter(ris)) {
-			now = mpam_msc_read_mbwu_l(msc);
-			nrdy = now & MSMON___NRDY_L;
-			if (mpam_has_feature(mpam_feat_msmon_mbwu_63counter, &ris->props))
-				now = FIELD_GET(MSMON___LWD_VALUE, now);
-			else
-				now = FIELD_GET(MSMON___L_VALUE, now);
-		} else {
-			now = mpam_read_monsel_reg(msc, MBWU);
-			nrdy = now & MSMON___NRDY;
-			now = FIELD_GET(MSMON___VALUE, now);
-		}
+		now = mpam_read_monsel_reg(msc, MBWU);
+		nrdy = now & MSMON___NRDY;
+		now = FIELD_GET(MSMON___VALUE, now);
 
 		if (nrdy)
 			break;
@@ -1231,13 +1166,8 @@ static int mpam_save_mbwu_state(void *arg)
 		cur_ctl = mpam_read_monsel_reg(msc, CFG_MBWU_CTL);
 		mpam_write_monsel_reg(msc, CFG_MBWU_CTL, 0);
 
-		if (mpam_ris_has_mbwu_long_counter(ris)) {
-			val = mpam_msc_read_mbwu_l(msc);
-			mpam_msc_zero_mbwu_l(msc);
-		} else {
-			val = mpam_read_monsel_reg(msc, MBWU);
-			mpam_write_monsel_reg(msc, MBWU, 0);
-		}
+		val = mpam_read_monsel_reg(msc, MBWU);
+		mpam_write_monsel_reg(msc, MBWU, 0);
 
 		cfg->mon = i;
 		cfg->pmg = FIELD_GET(MSMON_CFG_MBWU_FLT_PMG, cur_flt);
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index cafcce3e9efb..99790ba74768 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -330,8 +330,6 @@ int mpam_msmon_read(struct mpam_component *comp, struct mon_cfg *ctx,
 #define MSMON_CSU_CAPTURE       0x0848  /* last cache-usage value captured */
 #define MSMON_MBWU              0x0860  /* current mem-bw usage value */
 #define MSMON_MBWU_CAPTURE      0x0868  /* last mem-bw value captured */
-#define MSMON_MBWU_L		0x0880  /* current long mem-bw usage value */
-#define MSMON_MBWU_CAPTURE_L	0x0890  /* last long mem-bw value captured */
 #define MSMON_CAPT_EVNT         0x0808  /* signal a capture event */
 #define MPAMF_ESR               0x00F8  /* error status register */
 #define MPAMF_ECR               0x00F0  /* error control register */
@@ -535,10 +533,7 @@ int mpam_msmon_read(struct mpam_component *comp, struct mon_cfg *ctx,
  */
 #define MSMON___VALUE          GENMASK(30, 0)
 #define MSMON___NRDY           BIT(31)
-#define MSMON___NRDY_L		BIT(63)
-#define MSMON___L_VALUE		GENMASK(43, 0)
-#define MSMON___LWD_VALUE	GENMASK(62, 0)
-
+#define MSMON_MBWU_L_VALUE     GENMASK(62, 0)
 /*
  * MSMON_CAPT_EVNT - Memory system performance monitoring capture event
  *                  generation register
-- 
Gitee


From f2c09b0e0319e8dbeabeba01f1f59083fd12b1c8 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 092/280] anolis: Revert "arm_mpam: Probe for long/lwd mbwu
 counters"

ANBZ: #31045

This reverts commit 8b0268977fe1a52c7ba59dbdcffa8e1970fee05f.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 22 ----------------------
 drivers/platform/mpam/mpam_internal.h |  7 -------
 2 files changed, 29 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index c2c5dfa77083..930e14471378 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -653,7 +653,6 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris)
 				pr_err_once("Counters are not usable because not-ready timeout was not provided by firmware.");
 		}
 		if (FIELD_GET(MPAMF_MSMON_IDR_MSMON_MBWU, msmon_features)) {
-			bool has_long;
 			u32 mbwumonidr = mpam_read_partsel_reg(msc, MBWUMON_IDR);
 
 			props->num_mbwu_mon = FIELD_GET(MPAMF_MBWUMON_IDR_NUM_MON, mbwumonidr);
@@ -662,27 +661,6 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris)
 
 			if (FIELD_GET(MPAMF_MBWUMON_IDR_HAS_RWBW, mbwumonidr))
 				mpam_set_feature(mpam_feat_msmon_mbwu_rwbw, props);
-
-			/*
-			 * Treat long counter and its extension, lwd as mutually
-			 * exclusive feature bits. Though these are dependent
-			 * fields at the implementation level, there would never
-			 * be a need for mpam_feat_msmon_mbwu_44counter (long
-			 * counter) and mpam_feat_msmon_mbwu_63counter (lwd)
-			 * bits to be set together.
-			 *
-			 * mpam_feat_msmon_mbwu isn't treated as an exclusive
-			 * bit as this feature bit would be used as the "front
-			 * facing feature bit" for any checks related to mbwu
-			 * monitors.
-			 */
-			has_long = FIELD_GET(MPAMF_MBWUMON_IDR_HAS_LONG, mbwumonidr);
-			if (props->num_mbwu_mon && has_long) {
-				if (FIELD_GET(MPAMF_MBWUMON_IDR_LWD, mbwumonidr))
-					mpam_set_feature(mpam_feat_msmon_mbwu_63counter, props);
-				else
-					mpam_set_feature(mpam_feat_msmon_mbwu_44counter, props);
-			}
 		}
 	}
 
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index 99790ba74768..e546a8612dab 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -88,14 +88,7 @@ enum mpam_device_features {
 	mpam_feat_msmon,
 	mpam_feat_msmon_csu,
 	mpam_feat_msmon_csu_capture,
-	/*
-	 * Having mpam_feat_msmon_mbwu set doesn't mean the regular 31 bit MBWU
-	 * counter would be used. The exact counter used is decided based on the
-	 * status of mpam_feat_msmon_mbwu_l/mpam_feat_msmon_mbwu_lwd as well.
-	 */
 	mpam_feat_msmon_mbwu,
-	mpam_feat_msmon_mbwu_44counter,
-	mpam_feat_msmon_mbwu_63counter,
 	mpam_feat_msmon_mbwu_capture,
 	mpam_feat_msmon_mbwu_rwbw,
 	mpam_feat_msmon_capt,
-- 
Gitee


From 9f7efee3fd3e2b550dbc83d22e6fb696f61ecf3d Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 093/280] anolis: Revert "arm_mpam: Track bandwidth counter
 state for overflow and power management"

ANBZ: #31045

This reverts commit 3e4545b2dd5ec7899a522b90dad3de45d3c0855e.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 148 +-------------------------
 drivers/platform/mpam/mpam_internal.h |  52 +++------
 2 files changed, 19 insertions(+), 181 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 930e14471378..3516528f2e14 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -773,7 +773,6 @@ static void gen_msmon_ctl_flt_vals(struct mon_read *m, u32 *ctl_val,
 	*ctl_val |= MSMON_CFG_x_CTL_MATCH_PARTID;
 
 	*flt_val = FIELD_PREP(MSMON_CFG_MBWU_FLT_PARTID, ctx->partid);
-	*flt_val |= FIELD_PREP(MSMON_CFG_MBWU_FLT_RWBW, ctx->opts);
 	if (m->ctx->match_pmg) {
 		*ctl_val |= MSMON_CFG_x_CTL_MATCH_PMG;
 		*flt_val |= FIELD_PREP(MSMON_CFG_MBWU_FLT_PMG, ctx->pmg);
@@ -806,7 +805,6 @@ static void write_msmon_ctl_flt_vals(struct mon_read *m, u32 ctl_val,
 				     u32 flt_val)
 {
 	struct mpam_msc *msc = m->ris->msc;
-	struct msmon_mbwu_state *mbwu_state;
 
 	/*
 	 * Write the ctl_val with the enable bit cleared, reset the counter,
@@ -824,33 +822,21 @@ static void write_msmon_ctl_flt_vals(struct mon_read *m, u32 ctl_val,
 		mpam_write_monsel_reg(msc, CFG_MBWU_CTL, ctl_val);
 		mpam_write_monsel_reg(msc, MBWU, 0);
 		mpam_write_monsel_reg(msc, CFG_MBWU_CTL, ctl_val|MSMON_CFG_x_CTL_EN);
-
-		mbwu_state = &m->ris->mbwu_state[m->ctx->mon];
-		if (mbwu_state)
-			mbwu_state->prev_val = 0;
-
 		break;
 	default:
 		return;
 	}
 }
 
-static u64 mpam_msmon_overflow_val(struct mpam_msc_ris *ris)
-{
-	/* TODO: scaling, and long counters */
-	return GENMASK_ULL(30, 0);
-}
-
 static void __ris_msmon_read(void *arg)
 {
+	u64 now;
 	bool nrdy = false;
 	unsigned long flags;
 	struct mon_read *m = arg;
-	u64 now, overflow_val = 0;
 	struct mon_cfg *ctx = m->ctx;
 	struct mpam_msc_ris *ris = m->ris;
 	struct mpam_msc *msc = m->ris->msc;
-	struct msmon_mbwu_state *mbwu_state;
 	u32 mon_sel, ctl_val, flt_val, cur_ctl, cur_flt;
 
 	lockdep_assert_held(&msc->lock);
@@ -872,41 +858,22 @@ static void __ris_msmon_read(void *arg)
 	switch (m->type) {
 	case mpam_feat_msmon_csu:
 		now = mpam_read_monsel_reg(msc, CSU);
-		nrdy = now & MSMON___NRDY;
-		now = FIELD_GET(MSMON___VALUE, now);
 		break;
 	case mpam_feat_msmon_mbwu:
 		now = mpam_read_monsel_reg(msc, MBWU);
-		nrdy = now & MSMON___NRDY;
-		now = FIELD_GET(MSMON___VALUE, now);
-
-		if (nrdy)
-			break;
-
-		mbwu_state = &ris->mbwu_state[ctx->mon];
-		if (!mbwu_state)
-			break;
-
-		/* Add any pre-overflow value to the mbwu_state->val */
-		if (mbwu_state->prev_val > now)
-			overflow_val = mpam_msmon_overflow_val(ris) - mbwu_state->prev_val;
-
-		mbwu_state->prev_val = now;
-		mbwu_state->correction += overflow_val;
-
-		/* Include bandwidth consumed before the last hardware reset */
-		now += mbwu_state->correction;
 		break;
 	default:
 		return;
 	}
 	spin_unlock_irqrestore(&msc->mon_sel_lock, flags);
 
+	nrdy = now & MSMON___NRDY;
 	if (nrdy) {
 		m->err = -EBUSY;
 		return;
 	}
 
+	now = FIELD_GET(MSMON___VALUE, now);
 	*(m->val) += now;
 }
 
@@ -1097,68 +1064,6 @@ static int mpam_reprogram_ris(void *_arg)
 	return 0;
 }
 
-static int mpam_restore_mbwu_state(void *_ris)
-{
-	int i;
-	struct mon_read mwbu_arg;
-	struct mpam_msc_ris *ris = _ris;
-
-	lockdep_assert_held(&ris->msc->lock);
-
-	for (i = 0; i < ris->props.num_mbwu_mon; i++) {
-		if (ris->mbwu_state[i].enabled) {
-			mwbu_arg.ris = ris;
-			mwbu_arg.ctx = &ris->mbwu_state[i].cfg;
-			mwbu_arg.type = mpam_feat_msmon_mbwu;
-
-			__ris_msmon_read(&mwbu_arg);
-		}
-	}
-
-	return 0;
-}
-
-static int mpam_save_mbwu_state(void *arg)
-{
-	int i;
-	u64 val;
-	struct mon_cfg *cfg;
-	unsigned long flags;
-	u32 cur_flt, cur_ctl, mon_sel;
-	struct mpam_msc_ris *ris = arg;
-	struct mpam_msc *msc = ris->msc;
-	struct msmon_mbwu_state *mbwu_state;
-
-	lockdep_assert_held(&msc->lock);
-
-	for (i = 0; i < ris->props.num_mbwu_mon; i++) {
-		mbwu_state = &ris->mbwu_state[i];
-		cfg = &mbwu_state->cfg;
-
-		spin_lock_irqsave(&msc->mon_sel_lock, flags);
-		mon_sel = FIELD_PREP(MSMON_CFG_MON_SEL_MON_SEL, i) |
-			  FIELD_PREP(MSMON_CFG_MON_SEL_RIS, ris->ris_idx);
-		mpam_write_monsel_reg(msc, CFG_MON_SEL, mon_sel);
-
-		cur_flt = mpam_read_monsel_reg(msc, CFG_MBWU_FLT);
-		cur_ctl = mpam_read_monsel_reg(msc, CFG_MBWU_CTL);
-		mpam_write_monsel_reg(msc, CFG_MBWU_CTL, 0);
-
-		val = mpam_read_monsel_reg(msc, MBWU);
-		mpam_write_monsel_reg(msc, MBWU, 0);
-
-		cfg->mon = i;
-		cfg->pmg = FIELD_GET(MSMON_CFG_MBWU_FLT_PMG, cur_flt);
-		cfg->match_pmg = FIELD_GET(MSMON_CFG_x_CTL_MATCH_PMG, cur_ctl);
-		cfg->partid = FIELD_GET(MSMON_CFG_MBWU_FLT_PARTID, cur_flt);
-		mbwu_state->correction += val;
-		mbwu_state->enabled = FIELD_GET(MSMON_CFG_x_CTL_EN, cur_ctl);
-		spin_unlock_irqrestore(&msc->mon_sel_lock, flags);
-	}
-
-	return 0;
-}
-
 /*
  * Called via smp_call_on_cpu() to prevent migration, while still being
  * pre-emptible.
@@ -1220,9 +1125,6 @@ static void mpam_reset_msc(struct mpam_msc *msc, bool online)
 		 * for non-zero partid may be lost while the CPUs are offline.
 		 */
 		ris->in_reset_state = online;
-
-		if (mpam_is_enabled() && !online)
-			mpam_touch_msc(msc, &mpam_save_mbwu_state, ris);
 	}
 	srcu_read_unlock(&mpam_srcu, idx);
 }
@@ -1254,9 +1156,6 @@ static void mpam_reprogram_msc(struct mpam_msc *msc)
 			mpam_reprogram_ris_partid(ris, partid, cfg);
 		}
 		ris->in_reset_state = reset;
-
-		if (mpam_has_feature(mpam_feat_msmon_mbwu, &ris->props))
-			mpam_touch_msc(msc, &mpam_restore_mbwu_state, ris);
 	}
 	srcu_read_unlock(&mpam_srcu, idx);
 }
@@ -1915,31 +1814,8 @@ static void mpam_unregister_irqs(void)
 	cpus_read_unlock();
 }
 
-static void __destroy_component_cfg(struct mpam_component *comp)
-{
-	unsigned long flags;
-	struct mpam_msc_ris *ris;
-	struct msmon_mbwu_state *mbwu_state;
-
-	kfree(comp->cfg);
-	list_for_each_entry(ris, &comp->ris, comp_list) {
-		mutex_lock(&ris->msc->lock);
-		spin_lock_irqsave(&ris->msc->mon_sel_lock, flags);
-		mbwu_state = ris->mbwu_state;
-		ris->mbwu_state = NULL;
-		spin_unlock_irqrestore(&ris->msc->mon_sel_lock, flags);
-		mutex_unlock(&ris->msc->lock);
-
-		kfree(mbwu_state);
-	}
-}
-
 static int __allocate_component_cfg(struct mpam_component *comp)
 {
-	unsigned long flags;
-	struct mpam_msc_ris *ris;
-	struct msmon_mbwu_state *mbwu_state;
-
 	if (comp->cfg)
 		return 0;
 
@@ -1947,24 +1823,6 @@ static int __allocate_component_cfg(struct mpam_component *comp)
 	if (!comp->cfg)
 		return -ENOMEM;
 
-	list_for_each_entry(ris, &comp->ris, comp_list) {
-		if (!ris->props.num_mbwu_mon)
-			continue;
-
-		mbwu_state = kcalloc(ris->props.num_mbwu_mon,
-				     sizeof(*ris->mbwu_state), GFP_KERNEL);
-		if (!mbwu_state) {
-			__destroy_component_cfg(comp);
-			return -ENOMEM;
-		}
-
-		mutex_lock(&ris->msc->lock);
-		spin_lock_irqsave(&ris->msc->mon_sel_lock, flags);
-		ris->mbwu_state = mbwu_state;
-		spin_unlock_irqrestore(&ris->msc->mon_sel_lock, flags);
-		mutex_unlock(&ris->msc->lock);
-	}
-
 	return 0;
 }
 
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index e546a8612dab..06a31e5d9610 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -175,40 +175,8 @@ struct mpam_component
 	struct mpam_class	*class;
 };
 
-/* The values for MSMON_CFG_MBWU_FLT.RWBW */
-enum mon_filter_options {
-	COUNT_BOTH	= 0,
-	COUNT_WRITE	= 1,
-	COUNT_READ	= 2,
-};
-
-struct mon_cfg {
-	u16                     mon;
-	u8                      pmg;
-	bool                    match_pmg;
-	u32                     partid;
-	enum mon_filter_options opts;
-};
-
-/*
- * Changes to enabled and cfg are protected by the msc->lock.
- * Changes to prev_val and correction are protected by the msc's mon_sel_lock.
- */
-struct msmon_mbwu_state {
-	bool		enabled;
-	struct mon_cfg	cfg;
-
-	/* The value last read from the hardware. Used to detect overflow. */
-	u64		prev_val;
-
-	/*
-	 * The value to add to the new reading to account for power management,
-	 * and shifts to trigger the overflow interrupt.
-	 */
-	u64		correction;
-};
-
-struct mpam_msc_ris {
+struct mpam_msc_ris
+{
 	u8			ris_idx;
 	u64			idr;
 	struct mpam_props	props;
@@ -225,9 +193,21 @@ struct mpam_msc_ris {
 	/* parents: */
 	struct mpam_msc		*msc;
 	struct mpam_component	*comp;
+};
 
-	/* msmon mbwu configuration is preserved over reset */
-	struct msmon_mbwu_state	*mbwu_state;
+/* The values for MSMON_CFG_MBWU_FLT.RWBW */
+enum mon_filter_options {
+	COUNT_BOTH	= 0,
+	COUNT_WRITE	= 1,
+	COUNT_READ	= 2,
+};
+
+struct mon_cfg {
+	u16                     mon;
+	u8                      pmg;
+	bool                    match_pmg;
+	u32                     partid;
+	enum mon_filter_options opts;
 };
 
 static inline int mpam_alloc_csu_mon(struct mpam_class *class)
-- 
Gitee


From 8aaf5c2d8b962e1b9cbd36d42839e46bb581d5e3 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 094/280] anolis: Revert "arm_mpam: Add mpam_msmon_read() to
 read monitor value"

ANBZ: #31045

This reverts commit 286806f020804e571bfb2d834201c05274960b8d.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 219 --------------------------
 drivers/platform/mpam/mpam_internal.h |  19 ---
 2 files changed, 238 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 3516528f2e14..82dffe8c03ef 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -123,22 +123,6 @@ static void __mpam_write_reg(struct mpam_msc *msc, u16 reg, u32 val)
 	__mpam_write_reg(msc, MPAMCFG_##reg, val);		\
 })
 
-#define mpam_read_monsel_reg(msc, reg)			\
-({							\
-	u32 ____ret;					\
-							\
-	lockdep_assert_held_once(&msc->mon_sel_lock);	\
-	____ret = __mpam_read_reg(msc, MSMON_##reg);	\
-							\
-	____ret;					\
-})
-
-#define mpam_write_monsel_reg(msc, reg, val)			\
-({								\
-	lockdep_assert_held_once(&msc->mon_sel_lock);		\
-	__mpam_write_reg(msc, MSMON_##reg, val);		\
-})
-
 static u64 mpam_msc_read_idr(struct mpam_msc *msc)
 {
 	u64 idr_high = 0, idr_low;
@@ -741,209 +725,6 @@ static int mpam_msc_hw_probe(struct mpam_msc *msc)
 	return 0;
 }
 
-struct mon_read
-{
-	struct mpam_msc_ris		*ris;
-	struct mon_cfg			*ctx;
-	enum mpam_device_features	type;
-	u64				*val;
-	int				err;
-};
-
-static void gen_msmon_ctl_flt_vals(struct mon_read *m, u32 *ctl_val,
-				   u32 *flt_val)
-{
-	struct mon_cfg *ctx = m->ctx;
-
-	switch (m->type) {
-	case mpam_feat_msmon_csu:
-		*ctl_val = MSMON_CFG_MBWU_CTL_TYPE_CSU;
-		break;
-	case mpam_feat_msmon_mbwu:
-		*ctl_val = MSMON_CFG_MBWU_CTL_TYPE_MBWU;
-		break;
-	default:
-		return;
-	}
-
-	/*
-	 * For CSU counters its implementation-defined what happens when not
-	 * filtering by partid.
-	 */
-	*ctl_val |= MSMON_CFG_x_CTL_MATCH_PARTID;
-
-	*flt_val = FIELD_PREP(MSMON_CFG_MBWU_FLT_PARTID, ctx->partid);
-	if (m->ctx->match_pmg) {
-		*ctl_val |= MSMON_CFG_x_CTL_MATCH_PMG;
-		*flt_val |= FIELD_PREP(MSMON_CFG_MBWU_FLT_PMG, ctx->pmg);
-	}
-
-	if (mpam_has_feature(mpam_feat_msmon_mbwu_rwbw, &m->ris->props))
-		*flt_val |= FIELD_PREP(MSMON_CFG_MBWU_FLT_RWBW, ctx->opts);
-}
-
-static void read_msmon_ctl_flt_vals(struct mon_read *m, u32 *ctl_val,
-				    u32 *flt_val)
-{
-	struct mpam_msc *msc = m->ris->msc;
-
-	switch (m->type) {
-	case mpam_feat_msmon_csu:
-		*ctl_val = mpam_read_monsel_reg(msc, CFG_CSU_CTL);
-		*flt_val = mpam_read_monsel_reg(msc, CFG_CSU_FLT);
-		break;
-	case mpam_feat_msmon_mbwu:
-		*ctl_val = mpam_read_monsel_reg(msc, CFG_MBWU_CTL);
-		*flt_val = mpam_read_monsel_reg(msc, CFG_MBWU_FLT);
-		break;
-	default:
-		return;
-	}
-}
-
-static void write_msmon_ctl_flt_vals(struct mon_read *m, u32 ctl_val,
-				     u32 flt_val)
-{
-	struct mpam_msc *msc = m->ris->msc;
-
-	/*
-	 * Write the ctl_val with the enable bit cleared, reset the counter,
-	 * then enable counter.
-	 */
-	switch (m->type) {
-	case mpam_feat_msmon_csu:
-		mpam_write_monsel_reg(msc, CFG_CSU_FLT, flt_val);
-		mpam_write_monsel_reg(msc, CFG_CSU_CTL, ctl_val);
-		mpam_write_monsel_reg(msc, CSU, 0);
-		mpam_write_monsel_reg(msc, CFG_CSU_CTL, ctl_val|MSMON_CFG_x_CTL_EN);
-		break;
-	case mpam_feat_msmon_mbwu:
-		mpam_write_monsel_reg(msc, CFG_MBWU_FLT, flt_val);
-		mpam_write_monsel_reg(msc, CFG_MBWU_CTL, ctl_val);
-		mpam_write_monsel_reg(msc, MBWU, 0);
-		mpam_write_monsel_reg(msc, CFG_MBWU_CTL, ctl_val|MSMON_CFG_x_CTL_EN);
-		break;
-	default:
-		return;
-	}
-}
-
-static void __ris_msmon_read(void *arg)
-{
-	u64 now;
-	bool nrdy = false;
-	unsigned long flags;
-	struct mon_read *m = arg;
-	struct mon_cfg *ctx = m->ctx;
-	struct mpam_msc_ris *ris = m->ris;
-	struct mpam_msc *msc = m->ris->msc;
-	u32 mon_sel, ctl_val, flt_val, cur_ctl, cur_flt;
-
-	lockdep_assert_held(&msc->lock);
-
-	spin_lock_irqsave(&msc->mon_sel_lock, flags);
-	mon_sel = FIELD_PREP(MSMON_CFG_MON_SEL_MON_SEL, ctx->mon) |
-		  FIELD_PREP(MSMON_CFG_MON_SEL_RIS, ris->ris_idx);
-	mpam_write_monsel_reg(msc, CFG_MON_SEL, mon_sel);
-
-	/*
-	 * Read the existing configuration to avoid re-writing the same values.
-	 * This saves waiting for 'nrdy' on subsequent reads.
-	 */
-	read_msmon_ctl_flt_vals(m, &cur_ctl, &cur_flt);
-	gen_msmon_ctl_flt_vals(m, &ctl_val, &flt_val);
-	if (cur_flt != flt_val || cur_ctl != (ctl_val | MSMON_CFG_x_CTL_EN))
-		write_msmon_ctl_flt_vals(m, ctl_val, flt_val);
-
-	switch (m->type) {
-	case mpam_feat_msmon_csu:
-		now = mpam_read_monsel_reg(msc, CSU);
-		break;
-	case mpam_feat_msmon_mbwu:
-		now = mpam_read_monsel_reg(msc, MBWU);
-		break;
-	default:
-		return;
-	}
-	spin_unlock_irqrestore(&msc->mon_sel_lock, flags);
-
-	nrdy = now & MSMON___NRDY;
-	if (nrdy) {
-		m->err = -EBUSY;
-		return;
-	}
-
-	now = FIELD_GET(MSMON___VALUE, now);
-	*(m->val) += now;
-}
-
-static int _msmon_read(struct mpam_component *comp, struct mon_read *arg)
-{
-	int err, idx;
-	struct mpam_msc *msc;
-	struct mpam_msc_ris *ris;
-
-	idx = srcu_read_lock(&mpam_srcu);
-	list_for_each_entry_rcu(ris, &comp->ris, comp_list) {
-		arg->ris = ris;
-
-		msc = ris->msc;
-		mutex_lock(&msc->lock);
-		err = smp_call_function_any(&msc->accessibility,
-					    __ris_msmon_read, arg, true);
-		mutex_unlock(&msc->lock);
-		if (!err && arg->err)
-			err = arg->err;
-		if (err)
-			break;
-	}
-	srcu_read_unlock(&mpam_srcu, idx);
-
-	return err;
-}
-
-int mpam_msmon_read(struct mpam_component *comp, struct mon_cfg *ctx,
-		    enum mpam_device_features type, u64 *val)
-{
-	int err;
-	struct mon_read arg;
-	u64 wait_jiffies = 0;
-	struct mpam_props *cprops = &comp->class->props;
-
-	might_sleep();
-
-	if (!mpam_is_enabled())
-		return -EIO;
-
-	if (!mpam_has_feature(type, cprops))
-		return -EOPNOTSUPP;
-
-	memset(&arg, 0, sizeof(arg));
-	arg.ctx = ctx;
-	arg.type = type;
-	arg.val = val;
-	*val = 0;
-
-	err = _msmon_read(comp, &arg);
-	if (err == -EBUSY)
-		wait_jiffies = usecs_to_jiffies(comp->class->nrdy_usec);
-
-	while (wait_jiffies)
-		wait_jiffies = schedule_timeout_uninterruptible(wait_jiffies);
-
-	if (err == -EBUSY) {
-		memset(&arg, 0, sizeof(arg));
-		arg.ctx = ctx;
-		arg.type = type;
-		arg.val = val;
-		*val = 0;
-
-		err = _msmon_read(comp, &arg);
-	}
-
-	return err;
-}
-
 static void mpam_reset_msc_bitmap(struct mpam_msc *msc, u16 reg, u16 wd)
 {
 	u32 num_words, msb;
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index 06a31e5d9610..fd792f9fba86 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -62,7 +62,6 @@ struct mpam_msc
 	 * If needed, take msc->lock first.
 	 */
 	spinlock_t		part_sel_lock;
-	spinlock_t		mon_sel_lock;
 	void __iomem *		mapped_hwpage;
 	size_t			mapped_hwpage_sz;
 };
@@ -195,21 +194,6 @@ struct mpam_msc_ris
 	struct mpam_component	*comp;
 };
 
-/* The values for MSMON_CFG_MBWU_FLT.RWBW */
-enum mon_filter_options {
-	COUNT_BOTH	= 0,
-	COUNT_WRITE	= 1,
-	COUNT_READ	= 2,
-};
-
-struct mon_cfg {
-	u16                     mon;
-	u8                      pmg;
-	bool                    match_pmg;
-	u32                     partid;
-	enum mon_filter_options opts;
-};
-
 static inline int mpam_alloc_csu_mon(struct mpam_class *class)
 {
 	struct mpam_props *cprops = &class->props;
@@ -257,9 +241,6 @@ void mpam_disable(struct work_struct *work);
 int mpam_apply_config(struct mpam_component *comp, u16 partid,
 		      struct mpam_config *cfg);
 
-int mpam_msmon_read(struct mpam_component *comp, struct mon_cfg *ctx,
-		    enum mpam_device_features, u64 *val);
-
 /*
  * MPAM MSCs have the following register layout. See:
  * Arm Architecture Reference Manual Supplement - Memory System Resource
-- 
Gitee


From f9e0f540843db30fbc45211e21b6c91c2a4793f5 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 095/280] anolis: Revert "arm_mpam: Add helpers to allocate
 monitors"

ANBZ: #31045

This reverts commit 79ce37b820e2a6cd785cae2e6aa86d0baa94ce03.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  |  2 --
 drivers/platform/mpam/mpam_internal.h | 35 ---------------------------
 2 files changed, 37 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 82dffe8c03ef..612c4b97d373 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -244,8 +244,6 @@ mpam_class_alloc(u8 level_idx, enum mpam_class_types type, gfp_t gfp)
 	class->level = level_idx;
 	class->type = type;
 	INIT_LIST_HEAD_RCU(&class->classes_list);
-	ida_init(&class->ida_csu_mon);
-	ida_init(&class->ida_mbwu_mon);
 
 	list_add_rcu(&class->classes_list, &mpam_classes);
 
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index fd792f9fba86..d2319eefa565 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -138,9 +138,6 @@ struct mpam_class
 
 	/* member of mpam_classes */
 	struct list_head	classes_list;
-
-	struct ida		ida_csu_mon;
-	struct ida		ida_mbwu_mon;
 };
 
 struct mpam_config {
@@ -194,38 +191,6 @@ struct mpam_msc_ris
 	struct mpam_component	*comp;
 };
 
-static inline int mpam_alloc_csu_mon(struct mpam_class *class)
-{
-	struct mpam_props *cprops = &class->props;
-
-	if (!mpam_has_feature(mpam_feat_msmon_csu, cprops))
-		return -EOPNOTSUPP;
-
-	return ida_alloc_range(&class->ida_csu_mon, 0, cprops->num_csu_mon - 1,
-                                GFP_KERNEL);
-}
-
-static inline void mpam_free_csu_mon(struct mpam_class *class, int csu_mon)
-{
-	ida_free(&class->ida_csu_mon, csu_mon);
-}
-
-static inline int mpam_alloc_mbwu_mon(struct mpam_class *class)
-{
-	struct mpam_props *cprops = &class->props;
-
-	if (!mpam_has_feature(mpam_feat_msmon_mbwu, cprops))
-		return -EOPNOTSUPP;
-
-	return ida_alloc_range(&class->ida_mbwu_mon, 0,
-			       cprops->num_mbwu_mon - 1, GFP_KERNEL);
-}
-
-static inline void mpam_free_mbwu_mon(struct mpam_class *class, int mbwu_mon)
-{
-	ida_free(&class->ida_mbwu_mon, mbwu_mon);
-}
-
 /* List of all classes */
 extern struct list_head mpam_classes;
 extern struct srcu_struct mpam_srcu;
-- 
Gitee


From 807473da6ff846da65300e9fe3541947aa8f4522 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 096/280] anolis: Revert "arm_mpam: Probe and reset the rest of
 the features"

ANBZ: #31045

This reverts commit 6c0cd0f9f3d8538eb708f28f4a3632c10b917c2f.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 91 ---------------------------
 drivers/platform/mpam/mpam_internal.h | 10 +--
 2 files changed, 1 insertion(+), 100 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 612c4b97d373..7da57310d52c 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -549,20 +549,10 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris)
 	int err;
 	struct mpam_msc *msc = ris->msc;
 	struct mpam_props *props = &ris->props;
-	struct mpam_class *class = ris->comp->class;
 
 	lockdep_assert_held(&msc->lock);
 	lockdep_assert_held(&msc->part_sel_lock);
 
-	/* Cache Capacity Partitioning */
-	if (FIELD_GET(MPAMF_IDR_HAS_CCAP_PART, ris->idr)) {
-		u32 ccap_features = mpam_read_partsel_reg(msc, CCAP_IDR);
-
-		props->cmax_wd = FIELD_GET(MPAMF_CCAP_IDR_CMAX_WD, ccap_features);
-		if (props->cmax_wd)
-			mpam_set_feature(mpam_feat_ccap_part, props);
-	}
-
 	/* Cache Portion partitioning */
 	if (FIELD_GET(MPAMF_IDR_HAS_CPOR_PART, ris->idr)) {
 		u32 cpor_features = mpam_read_partsel_reg(msc, CPOR_IDR);
@@ -585,31 +575,6 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris)
 		props->bwa_wd = FIELD_GET(MPAMF_MBW_IDR_BWA_WD, mbw_features);
 		if (props->bwa_wd && FIELD_GET(MPAMF_MBW_IDR_HAS_MAX, mbw_features))
 			mpam_set_feature(mpam_feat_mbw_max, props);
-
-		if (props->bwa_wd && FIELD_GET(MPAMF_MBW_IDR_HAS_MIN, mbw_features))
-			mpam_set_feature(mpam_feat_mbw_min, props);
-
-		if (props->bwa_wd && FIELD_GET(MPAMF_MBW_IDR_HAS_PROP, mbw_features))
-			mpam_set_feature(mpam_feat_mbw_prop, props);
-	}
-
-	/* Priority partitioning */
-	if (FIELD_GET(MPAMF_IDR_HAS_PRI_PART, ris->idr)) {
-		u32 pri_features = mpam_read_partsel_reg(msc, PRI_IDR);
-
-		props->intpri_wd = FIELD_GET(MPAMF_PRI_IDR_INTPRI_WD, pri_features);
-		if (props->intpri_wd && FIELD_GET(MPAMF_PRI_IDR_HAS_INTPRI, pri_features)) {
-			mpam_set_feature(mpam_feat_intpri_part, props);
-			if (FIELD_GET(MPAMF_PRI_IDR_INTPRI_0_IS_LOW, pri_features))
-				mpam_set_feature(mpam_feat_intpri_part_0_low, props);
-		}
-
-		props->dspri_wd = FIELD_GET(MPAMF_PRI_IDR_DSPRI_WD, pri_features);
-		if (props->dspri_wd && FIELD_GET(MPAMF_PRI_IDR_HAS_DSPRI, pri_features)) {
-			mpam_set_feature(mpam_feat_dspri_part, props);
-			if (FIELD_GET(MPAMF_PRI_IDR_DSPRI_0_IS_LOW, pri_features))
-				mpam_set_feature(mpam_feat_dspri_part_0_low, props);
-		}
 	}
 
 	/* Performance Monitoring */
@@ -645,21 +610,6 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris)
 				mpam_set_feature(mpam_feat_msmon_mbwu_rwbw, props);
 		}
 	}
-
-	/*
-	 * RIS with PARTID narrowing don't have enough storage for one
-	 * configuration per PARTID. If these are in a class we could use,
-	 * reduce the supported partid_max to match the numer of intpartid.
-	 * If the class is unknown, just ignore it.
-	 */
-	if (FIELD_GET(MPAMF_IDR_HAS_PARTID_NRW, ris->idr) &&
-	    class->type != MPAM_CLASS_UNKNOWN) {
-		u32 nrwidr = mpam_read_partsel_reg(msc, PARTID_NRW_IDR);
-		u16 partid_max = FIELD_GET(MPAMF_PARTID_NRW_IDR_INTPARTID_MAX, nrwidr);
-
-		mpam_set_feature(mpam_feat_partid_nrw, props);
-		msc->partid_max = min(msc->partid_max, partid_max);
-	}
 }
 
 static int mpam_msc_hw_probe(struct mpam_msc *msc)
@@ -752,21 +702,13 @@ static void mpam_reset_msc_bitmap(struct mpam_msc *msc, u16 reg, u16 wd)
 static void mpam_reprogram_ris_partid(struct mpam_msc_ris *ris, u16 partid,
 				      struct mpam_config *cfg)
 {
-	u32 pri_val = 0;
-	u16 cmax = MPAMCFG_CMAX_CMAX;
 	struct mpam_msc *msc = ris->msc;
 	u16 bwa_fract = MPAMCFG_MBW_MAX_MAX;
 	struct mpam_props *rprops = &ris->props;
-	u16 dspri = GENMASK(rprops->dspri_wd, 0);
-	u16 intpri = GENMASK(rprops->intpri_wd, 0);
 
 	spin_lock(&msc->part_sel_lock);
 	__mpam_part_sel(ris->ris_idx, partid, msc);
 
-	if(mpam_has_feature(mpam_feat_partid_nrw, rprops))
-		mpam_write_partsel_reg(msc, INTPARTID,
-				      (MPAMCFG_PART_SEL_INTERNAL | partid));
-
 	if (mpam_has_feature(mpam_feat_cpor_part, rprops)) {
 		if (mpam_has_feature(mpam_feat_cpor_part, cfg))
 			mpam_write_partsel_reg(msc, CPBM, cfg->cpbm);
@@ -795,26 +737,6 @@ static void mpam_reprogram_ris_partid(struct mpam_msc_ris *ris, u16 partid,
 
 	if (mpam_has_feature(mpam_feat_mbw_prop, rprops))
 		mpam_write_partsel_reg(msc, MBW_PROP, bwa_fract);
-
-	if (mpam_has_feature(mpam_feat_ccap_part, rprops))
-		mpam_write_partsel_reg(msc, CMAX, cmax);
-
-	if (mpam_has_feature(mpam_feat_intpri_part, rprops) ||
-	    mpam_has_feature(mpam_feat_dspri_part, rprops)) {
-		/* aces high? */
-		if (!mpam_has_feature(mpam_feat_intpri_part_0_low, rprops))
-			intpri = 0;
-		if (!mpam_has_feature(mpam_feat_dspri_part_0_low, rprops))
-			dspri = 0;
-
-		if (mpam_has_feature(mpam_feat_intpri_part, rprops))
-			pri_val |= FIELD_PREP(MPAMCFG_PRI_INTPRI, intpri);
-		if (mpam_has_feature(mpam_feat_dspri_part, rprops))
-			pri_val |= FIELD_PREP(MPAMCFG_PRI_DSPRI, dspri);
-
-		mpam_write_partsel_reg(msc, PRI, pri_val);
-	}
-
 	spin_unlock(&msc->part_sel_lock);
 }
 
@@ -1363,19 +1285,6 @@ __resource_props_mismatch(struct mpam_msc_ris *ris, struct mpam_class *class)
 		cprops->num_csu_mon = min(cprops->num_csu_mon, rprops->num_csu_mon);
 	if (cprops->num_mbwu_mon != rprops->num_mbwu_mon)
 		cprops->num_mbwu_mon = min(cprops->num_mbwu_mon, rprops->num_mbwu_mon);
-
-	if (cprops->intpri_wd != rprops->intpri_wd)
-		cprops->intpri_wd = min(cprops->intpri_wd, rprops->intpri_wd);
-	if (cprops->dspri_wd != rprops->dspri_wd)
-		cprops->dspri_wd = min(cprops->dspri_wd, rprops->dspri_wd);
-
-	/* {int,ds}pri may not have differing 0-low behaviour */
-	if (mpam_has_feature(mpam_feat_intpri_part_0_low, cprops) !=
-	    mpam_has_feature(mpam_feat_intpri_part_0_low, rprops))
-		mpam_clear_feature(mpam_feat_intpri_part, &cprops->features);
-	if (mpam_has_feature(mpam_feat_dspri_part_0_low, cprops) !=
-	    mpam_has_feature(mpam_feat_dspri_part_0_low, rprops))
-		mpam_clear_feature(mpam_feat_dspri_part, &cprops->features);
 }
 
 /*
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index d2319eefa565..fa9386263dd5 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -70,7 +70,7 @@ struct mpam_msc
  * When we compact the supported features, we don't care what they are.
  * Storing them as a bitmap makes life easy.
  */
-typedef u32 mpam_features_t;
+typedef u16 mpam_features_t;
 
 /* Bits for mpam_features_t */
 enum mpam_device_features {
@@ -80,10 +80,6 @@ enum mpam_device_features {
 	mpam_feat_mbw_min,
 	mpam_feat_mbw_max,
 	mpam_feat_mbw_prop,
-	mpam_feat_intpri_part,
-	mpam_feat_intpri_part_0_low,
-	mpam_feat_dspri_part,
-	mpam_feat_dspri_part_0_low,
 	mpam_feat_msmon,
 	mpam_feat_msmon_csu,
 	mpam_feat_msmon_csu_capture,
@@ -91,7 +87,6 @@ enum mpam_device_features {
 	mpam_feat_msmon_mbwu_capture,
 	mpam_feat_msmon_mbwu_rwbw,
 	mpam_feat_msmon_capt,
-	mpam_feat_partid_nrw,
 	MPAM_FEATURE_LAST,
 };
 #define MPAM_ALL_FEATURES      ((1<<MPAM_FEATURE_LAST) - 1)
@@ -103,9 +98,6 @@ struct mpam_props
 	u16			cpbm_wd;
 	u16			mbw_pbm_bits;
 	u8			bwa_wd;
-	u16			cmax_wd;
-	u16			intpri_wd;
-	u16			dspri_wd;
 	u16			num_csu_mon;
 	u16			num_mbwu_mon;
 };
-- 
Gitee


From a6453d579c3fec40a2ea6f7fe649603017f9d261 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 097/280] anolis: Revert "arm_mpam: Allow configuration to be
 applied and restored during cpu online"

ANBZ: #31045

This reverts commit 5a8ca4ed94d3f594592d6f5cb33c9b39a8bf5373.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 193 +++-----------------------
 drivers/platform/mpam/mpam_internal.h |  24 +---
 2 files changed, 25 insertions(+), 192 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 7da57310d52c..04e1dfd1c5e3 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -699,89 +699,51 @@ static void mpam_reset_msc_bitmap(struct mpam_msc *msc, u16 reg, u16 wd)
 		__mpam_write_reg(msc, reg, bm);
 }
 
-static void mpam_reprogram_ris_partid(struct mpam_msc_ris *ris, u16 partid,
-				      struct mpam_config *cfg)
+static void mpam_reset_ris_partid(struct mpam_msc_ris *ris, u16 partid)
 {
 	struct mpam_msc *msc = ris->msc;
 	u16 bwa_fract = MPAMCFG_MBW_MAX_MAX;
 	struct mpam_props *rprops = &ris->props;
 
+	lockdep_assert_held(&msc->lock);
+
 	spin_lock(&msc->part_sel_lock);
 	__mpam_part_sel(ris->ris_idx, partid, msc);
 
-	if (mpam_has_feature(mpam_feat_cpor_part, rprops)) {
-		if (mpam_has_feature(mpam_feat_cpor_part, cfg))
-			mpam_write_partsel_reg(msc, CPBM, cfg->cpbm);
-		else
-			mpam_reset_msc_bitmap(msc, MPAMCFG_CPBM,
-					      rprops->cpbm_wd);
-	}
+	if (mpam_has_feature(mpam_feat_cpor_part, rprops))
+		mpam_reset_msc_bitmap(msc, MPAMCFG_CPBM, rprops->cpbm_wd);
 
-	if (mpam_has_feature(mpam_feat_mbw_part, rprops)) {
-		if (mpam_has_feature(mpam_feat_mbw_part, cfg))
-			mpam_write_partsel_reg(msc, MBW_PBM, cfg->mbw_pbm);
-		else
-			mpam_reset_msc_bitmap(msc, MPAMCFG_MBW_PBM,
-					      rprops->mbw_pbm_bits);
-	}
+	if (mpam_has_feature(mpam_feat_mbw_part, rprops))
+		mpam_reset_msc_bitmap(msc, MPAMCFG_MBW_PBM, rprops->mbw_pbm_bits);
 
 	if (mpam_has_feature(mpam_feat_mbw_min, rprops))
 		mpam_write_partsel_reg(msc, MBW_MIN, 0);
 
-	if (mpam_has_feature(mpam_feat_mbw_max, rprops)) {
-		if (mpam_has_feature(mpam_feat_mbw_max, cfg))
-			mpam_write_partsel_reg(msc, MBW_MAX, cfg->mbw_max);
-		else
-			mpam_write_partsel_reg(msc, MBW_MAX, bwa_fract);
-	}
+	if (mpam_has_feature(mpam_feat_mbw_max, rprops))
+		mpam_write_partsel_reg(msc, MBW_MAX, bwa_fract);
 
 	if (mpam_has_feature(mpam_feat_mbw_prop, rprops))
 		mpam_write_partsel_reg(msc, MBW_PROP, bwa_fract);
 	spin_unlock(&msc->part_sel_lock);
 }
 
-struct reprogram_ris {
-	struct mpam_msc_ris *ris;
-	struct mpam_config *cfg;
-};
-
-/* Call with MSC lock held */
-static int mpam_reprogram_ris(void *_arg)
-{
-	u16 partid, partid_max;
-	struct reprogram_ris *arg = _arg;
-	struct mpam_msc_ris *ris = arg->ris;
-	struct mpam_config *cfg = arg->cfg;
-
-	if (ris->in_reset_state)
-		return 0;
-
-	spin_lock(&partid_max_lock);
-	partid_max = mpam_partid_max;
-	spin_unlock(&partid_max_lock);
-	for (partid = 0; partid < partid_max; partid++)
-		mpam_reprogram_ris_partid(ris, partid, cfg);
-
-	return 0;
-}
-
 /*
  * Called via smp_call_on_cpu() to prevent migration, while still being
  * pre-emptible.
  */
 static int mpam_reset_ris(void *arg)
 {
+	u16 partid, partid_max;
 	struct mpam_msc_ris *ris = arg;
-	struct reprogram_ris reprogram_arg;
-	struct mpam_config empty_cfg = { 0 };
 
 	if (ris->in_reset_state)
 		return 0;
 
-	reprogram_arg.ris = ris;
-	reprogram_arg.cfg = &empty_cfg;
-
-	mpam_reprogram_ris(&reprogram_arg);
+	spin_lock(&partid_max_lock);
+	partid_max = mpam_partid_max;
+	spin_unlock(&partid_max_lock);
+	for (partid = 0; partid < partid_max; partid++)
+		mpam_reset_ris_partid(ris, partid);
 
 	return 0;
 }
@@ -830,37 +792,6 @@ static void mpam_reset_msc(struct mpam_msc *msc, bool online)
 	srcu_read_unlock(&mpam_srcu, idx);
 }
 
-static void mpam_reprogram_msc(struct mpam_msc *msc)
-{
-	int idx;
-	u16 partid;
-	bool reset;
-	struct mpam_config *cfg;
-	struct mpam_msc_ris *ris;
-
-	lockdep_assert_held(&msc->lock);
-
-	idx = srcu_read_lock(&mpam_srcu);
-	list_for_each_entry_rcu(ris, &msc->ris, msc_list) {
-		if (!mpam_is_enabled() && !ris->in_reset_state) {
-			mpam_touch_msc(msc, &mpam_reset_ris, ris);
-			ris->in_reset_state = true;
-			continue;
-		}
-
-		reset = true;
-		for (partid = 0; partid < mpam_partid_max; partid++) {
-			cfg = &ris->comp->cfg[partid];
-			if (cfg->features)
-				reset = false;
-
-			mpam_reprogram_ris_partid(ris, partid, cfg);
-		}
-		ris->in_reset_state = reset;
-	}
-	srcu_read_unlock(&mpam_srcu, idx);
-}
-
 static void _enable_percpu_irq(void *_irq)
 {
 	int *irq = _irq;
@@ -882,7 +813,7 @@ static int mpam_cpu_online(unsigned int cpu)
 			_enable_percpu_irq(&msc->reenable_error_ppi);
 
 		if (atomic_fetch_inc(&msc->online_refs) == 0)
-			mpam_reprogram_msc(msc);
+			mpam_reset_msc(msc, true);
 		mutex_unlock(&msc->lock);
 	}
 	srcu_read_unlock(&mpam_srcu, idx);
@@ -1502,37 +1433,6 @@ static void mpam_unregister_irqs(void)
 	cpus_read_unlock();
 }
 
-static int __allocate_component_cfg(struct mpam_component *comp)
-{
-	if (comp->cfg)
-		return 0;
-
-	comp->cfg = kcalloc(mpam_partid_max, sizeof(*comp->cfg), GFP_KERNEL);
-	if (!comp->cfg)
-		return -ENOMEM;
-
-	return 0;
-}
-
-static int mpam_allocate_config(void)
-{
-	int err = 0;
-	struct mpam_class *class;
-	struct mpam_component *comp;
-
-	lockdep_assert_held(&mpam_list_lock);
-
-	list_for_each_entry(class, &mpam_classes, classes_list) {
-		list_for_each_entry(comp, &class->components, class_list) {
-			err = __allocate_component_cfg(comp);
-			if (err)
-				return err;
-		}
-	}
-
-	return 0;
-}
-
 static void mpam_enable_once(void)
 {
 	int err;
@@ -1544,21 +1444,12 @@ static void mpam_enable_once(void)
 	 */
 	cpus_read_lock();
 	mutex_lock(&mpam_list_lock);
-	do {
-		mpam_enable_merge_features();
+	mpam_enable_merge_features();
 
-		err = mpam_allocate_config();
-		if (err) {
-			pr_err("Failed to allocate configuration arrays.\n");
-			break;
-		}
+	err = mpam_register_irqs();
+	if (err)
+		pr_warn("Failed to register irqs: %d\n", err);
 
-		err = mpam_register_irqs();
-		if (err) {
-			pr_warn("Failed to register irqs: %d\n", err);
-			break;
-		}
-	} while (0);
 	mutex_unlock(&mpam_list_lock);
 	cpus_read_unlock();
 
@@ -1595,8 +1486,6 @@ static void mpam_reset_class(struct mpam_class *class)
 
 	idx = srcu_read_lock(&mpam_srcu);
 	list_for_each_entry_rcu(comp, &class->components, class_list) {
-		memset(comp->cfg, 0, (mpam_partid_max * sizeof(*comp->cfg)));
-
 		list_for_each_entry_rcu(ris, &comp->ris, comp_list) {
 			mutex_lock(&ris->msc->lock);
 			mpam_touch_msc(ris->msc, mpam_reset_ris, ris);
@@ -1686,48 +1575,6 @@ static int mpam_msc_drv_remove(struct platform_device *pdev)
 	return 0;
 }
 
-struct mpam_write_config_arg {
-	struct mpam_msc_ris *ris;
-	struct mpam_component *comp;
-	u16 partid;
-};
-
-static int __write_config(void *arg)
-{
-	struct mpam_write_config_arg *c = arg;
-
-	mpam_reprogram_ris_partid(c->ris, c->partid, &c->comp->cfg[c->partid]);
-
-	return 0;
-}
-
-/* TODO: split into write_config/sync_config */
-/* TODO: add config_dirty bitmap to drive sync_config */
-int mpam_apply_config(struct mpam_component *comp, u16 partid,
-		      struct mpam_config *cfg)
-{
-	struct mpam_write_config_arg arg;
-	struct mpam_msc_ris *ris;
-	int idx;
-
-	lockdep_assert_cpus_held();
-
-	comp->cfg[partid] = *cfg;
-	arg.comp = comp;
-	arg.partid = partid;
-
-	idx = srcu_read_lock(&mpam_srcu);
-	list_for_each_entry_rcu(ris, &comp->ris, comp_list) {
-		arg.ris = ris;
-		mutex_lock(&ris->msc->lock);
-		mpam_touch_msc(ris->msc, __write_config, &arg);
-		mutex_unlock(&ris->msc->lock);
-	}
-	srcu_read_unlock(&mpam_srcu, idx);
-
-	return 0;
-}
-
 static const struct of_device_id mpam_of_match[] = {
 	{ .compatible = "arm,mpam-msc", },
 	{},
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index fa9386263dd5..bc97d569a2bd 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -102,7 +102,11 @@ struct mpam_props
 	u16			num_mbwu_mon;
 };
 
-#define mpam_has_feature(_feat, x)	((1<<_feat) & (x)->features)
+static inline bool mpam_has_feature(enum mpam_device_features feat,
+				    struct mpam_props *props)
+{
+	return (1<<feat) & props->features;
+}
 
 static inline void mpam_set_feature(enum mpam_device_features feat,
 				    struct mpam_props *props)
@@ -132,15 +136,6 @@ struct mpam_class
 	struct list_head	classes_list;
 };
 
-struct mpam_config {
-	/* Which configuration values are valid. 0 is used for reset */
-	mpam_features_t		features;
-
-	u32	cpbm;
-	u32	mbw_pbm;
-	u16	mbw_max;
-};
-
 struct mpam_component
 {
 	u32			comp_id;
@@ -150,12 +145,6 @@ struct mpam_component
 
 	cpumask_t		affinity;
 
-	/*
-	 * Array of configuration values, indexed by partid.
-	 * Read from cpuhp callbacks, hold the cpuhp lock when writing.
-	 */
-	struct mpam_config	*cfg;
-
 	/* member of mpam_class:components */
 	struct list_head	class_list;
 
@@ -195,9 +184,6 @@ extern u8 mpam_pmg_max;
 void mpam_enable(struct work_struct *work);
 void mpam_disable(struct work_struct *work);
 
-int mpam_apply_config(struct mpam_component *comp, u16 partid,
-		      struct mpam_config *cfg);
-
 /*
  * MPAM MSCs have the following register layout. See:
  * Arm Architecture Reference Manual Supplement - Memory System Resource
-- 
Gitee


From b157fb5d3e7236ab6a2f6f3fb605f46b74b28670 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 098/280] anolis: Revert "arm_mpam: Use the arch static key to
 indicate when mpam is enabled"

ANBZ: #31045

This reverts commit 380018d3afccc57da8e875fa0fb234755edd0c99.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 6 ------
 drivers/platform/mpam/mpam_internal.h | 8 --------
 2 files changed, 14 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 04e1dfd1c5e3..ac82c041999d 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -828,9 +828,6 @@ static int mpam_discovery_cpu_online(unsigned int cpu)
 	struct mpam_msc *msc;
 	bool new_device_probed = false;
 
-	if (mpam_is_enabled())
-		return 0;
-
 	mutex_lock(&mpam_list_lock);
 	list_for_each_entry(msc, &mpam_all_msc, glbl_list) {
 		if (!cpumask_test_cpu(cpu, &msc->accessibility))
@@ -1471,7 +1468,6 @@ static void mpam_enable_once(void)
 	partid_max_published = true;
 	spin_unlock(&partid_max_lock);
 
-	static_branch_enable(&mpam_enabled);
 	mpam_register_cpuhp_callbacks(mpam_cpu_online);
 
 	pr_info("MPAM enabled with %u partid and %u pmg\n",
@@ -1513,8 +1509,6 @@ static irqreturn_t mpam_disable_thread(int irq, void *dev_id)
 	}
 	mutex_unlock(&mpam_cpuhp_state_lock);
 
-	static_branch_disable(&mpam_enabled);
-
 	mpam_unregister_irqs();
 
 	idx = srcu_read_lock(&mpam_srcu);
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index bc97d569a2bd..b58d031d34e9 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -8,20 +8,12 @@
 #include <linux/atomic.h>
 #include <linux/cpumask.h>
 #include <linux/io.h>
-#include <linux/jump_label.h>
 #include <linux/mailbox_client.h>
 #include <linux/mutex.h>
 #include <linux/resctrl.h>
 #include <linux/sizes.h>
 #include <linux/srcu.h>
 
-DECLARE_STATIC_KEY_FALSE(mpam_enabled);
-
-static inline bool mpam_is_enabled(void)
-{
-	return static_branch_likely(&mpam_enabled);
-}
-
 struct mpam_msc
 {
 	/* member of mpam_all_msc */
-- 
Gitee


From e37efabd3d413ccdbdca1946354635dc49e7d987 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 099/280] anolis: Revert "arm_mpam: Register and enable IRQs"

ANBZ: #31045

This reverts commit fd9c5ee54b7acfcd16f4032d707556aef3eec505.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 311 +-------------------------
 drivers/platform/mpam/mpam_internal.h |   8 -
 2 files changed, 10 insertions(+), 309 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index ac82c041999d..6091e87308ba 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -14,9 +14,6 @@
 #include <linux/device.h>
 #include <linux/errno.h>
 #include <linux/gfp.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/irqdesc.h>
 #include <linux/list.h>
 #include <linux/lockdep.h>
 #include <linux/mutex.h>
@@ -67,12 +64,6 @@ static DEFINE_SPINLOCK(partid_max_lock);
  */
 static DECLARE_WORK(mpam_enable_work, &mpam_enable);
 
-/*
- * All mpam error interrupts indicate a software bug. On receipt, disable the
- * driver.
- */
-static DECLARE_WORK(mpam_broken_work, &mpam_disable);
-
 /*
  * An MSC is a container for resources, each identified by their RIS index.
  * Components are a group of RIS that control the same thing.
@@ -136,24 +127,6 @@ static u64 mpam_msc_read_idr(struct mpam_msc *msc)
 	return (idr_high << 32) | idr_low;
 }
 
-static void mpam_msc_zero_esr(struct mpam_msc *msc)
-{
-	writel_relaxed(0, msc->mapped_hwpage + MPAMF_ESR);
-	if (msc->has_extd_esr)
-		writel_relaxed(0, msc->mapped_hwpage + MPAMF_ESR + 4);
-}
-
-static u64 mpam_msc_read_esr(struct mpam_msc *msc)
-{
-	u64 esr_high = 0, esr_low;
-
-	esr_low = readl_relaxed(msc->mapped_hwpage + MPAMF_ESR);
-	if (msc->has_extd_esr)
-		esr_high = readl_relaxed(msc->mapped_hwpage + MPAMF_ESR + 4);
-
-	return (esr_high << 32) | esr_low;
-}
-
 static void __mpam_part_sel(u8 ris_idx, u16 partid, struct mpam_msc *msc)
 {
 	u32 partsel;
@@ -649,7 +622,6 @@ static int mpam_msc_hw_probe(struct mpam_msc *msc)
 		pmg_max = FIELD_GET(MPAMF_IDR_PMG_MAX, idr);
 		msc->partid_max = min(msc->partid_max, partid_max);
 		msc->pmg_max = min(msc->pmg_max, pmg_max);
-		msc->has_extd_esr = FIELD_GET(MPAMF_IDR_HAS_EXT_ESR, idr);
 
 		ris = mpam_get_or_create_ris(msc, ris_idx);
 		if (IS_ERR(ris)) {
@@ -792,12 +764,6 @@ static void mpam_reset_msc(struct mpam_msc *msc, bool online)
 	srcu_read_unlock(&mpam_srcu, idx);
 }
 
-static void _enable_percpu_irq(void *_irq)
-{
-	int *irq = _irq;
-	enable_percpu_irq(*irq, IRQ_TYPE_NONE);
-}
-
 static int mpam_cpu_online(unsigned int cpu)
 {
 	int idx;
@@ -808,13 +774,11 @@ static int mpam_cpu_online(unsigned int cpu)
 		if (!cpumask_test_cpu(cpu, &msc->accessibility))
 			continue;
 
-		mutex_lock(&msc->lock);
-		if (msc->reenable_error_ppi)
-			_enable_percpu_irq(&msc->reenable_error_ppi);
-
-		if (atomic_fetch_inc(&msc->online_refs) == 0)
+		if (atomic_fetch_inc(&msc->online_refs) == 0) {
+			mutex_lock(&msc->lock);
 			mpam_reset_msc(msc, true);
-		mutex_unlock(&msc->lock);
+			mutex_unlock(&msc->lock);
+		}
 	}
 	srcu_read_unlock(&mpam_srcu, idx);
 
@@ -864,13 +828,11 @@ static int mpam_cpu_offline(unsigned int cpu)
 		if (!cpumask_test_cpu(cpu, &msc->accessibility))
 			continue;
 
-		mutex_lock(&msc->lock);
-		if (msc->reenable_error_ppi)
-			disable_percpu_irq(msc->reenable_error_ppi);
-
-		if (atomic_dec_and_test(&msc->online_refs))
+		if (atomic_dec_and_test(&msc->online_refs)) {
+			mutex_lock(&msc->lock);
 			mpam_reset_msc(msc, false);
-		mutex_unlock(&msc->lock);
+			mutex_unlock(&msc->lock);
+		}
 	}
 	srcu_read_unlock(&mpam_srcu, idx);
 
@@ -889,50 +851,6 @@ static void mpam_register_cpuhp_callbacks(int (*online)(unsigned int online))
 	mutex_unlock(&mpam_cpuhp_state_lock);
 }
 
-static int __setup_ppi(struct mpam_msc *msc)
-{
-	int cpu;
-
-	msc->error_dev_id = alloc_percpu_gfp(struct mpam_msc *, GFP_KERNEL);
-	if (!msc->error_dev_id)
-		return -ENOMEM;
-
-	for_each_cpu(cpu, &msc->accessibility) {
-		struct mpam_msc *empty = *per_cpu_ptr(msc->error_dev_id, cpu);
-		if (empty != NULL) {
-			pr_err_once("%s shares PPI with %s!\n", 				    dev_name(&msc->pdev->dev),
-				    dev_name(&empty->pdev->dev));
-			return -EBUSY;
-		}
-		*per_cpu_ptr(msc->error_dev_id, cpu) = msc;
-	}
-
-	return 0;
-}
-
-static int mpam_msc_setup_error_irq(struct mpam_msc *msc)
-{
-	int irq;
-
-	irq = platform_get_irq_byname_optional(msc->pdev, "error");
-	if (irq <= 0)
-		return 0;
-
-	/* Allocate and initialise the percpu device pointer for PPI */
-	if (irq_is_percpu(irq))
-
-		return __setup_ppi(msc);
-
-	/* sanity check: shared interrupts can be routed anywhere? */
-	if (!cpumask_equal(&msc->accessibility, cpu_possible_mask)) {
-		pr_err_once("msc:%u is a private resource with a shared error interrupt",
-			    msc->id);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
 static int mpam_dt_count_msc(void)
 {
 	int count = 0;
@@ -1103,13 +1021,6 @@ static int mpam_msc_drv_probe(struct platform_device *pdev)
 		spin_lock_init(&msc->part_sel_lock);
 		spin_lock_init(&msc->mon_sel_lock);
 
-		err = mpam_msc_setup_error_irq(msc);
-		if (err) {
-			devm_kfree(&pdev->dev, msc);
-			msc = ERR_PTR(err);
-			break;
-		}
-
 		if (device_property_read_u32(&pdev->dev, "pcc-channel",
 					     &msc->pcc_subspace_id))
 			msc->iface = MPAM_IFACE_MMIO;
@@ -1262,198 +1173,11 @@ static void mpam_enable_merge_features(void)
 	}
 }
 
-static char *mpam_errcode_names[16] = {
-	[0] = "No error",
-	[1] = "PARTID_SEL_Range",
-	[2] = "Req_PARTID_Range",
-	[3] = "MSMONCFG_ID_RANGE",
-	[4] = "Req_PMG_Range",
-	[5] = "Monitor_Range",
-	[6] = "intPARTID_Range",
-	[7] = "Unexpected_INTERNAL",
-	[8] = "Undefined_RIS_PART_SEL",
-	[9] = "RIS_No_Control",
-	[10] = "Undefined_RIS_MON_SEL",
-	[11] = "RIS_No_Monitor",
-	[12 ... 15] = "Reserved"
-};
-
-static int mpam_enable_msc_ecr(void *_msc)
-{
-	struct mpam_msc *msc = _msc;
-
-	writel_relaxed(1, msc->mapped_hwpage + MPAMF_ECR);
-
-	return 0;
-}
-
-static int mpam_disable_msc_ecr(void *_msc)
-{
-	struct mpam_msc *msc = _msc;
-
-	writel_relaxed(0, msc->mapped_hwpage + MPAMF_ECR);
-
-	return 0;
-}
-
-static irqreturn_t __mpam_irq_handler(int irq, struct mpam_msc *msc)
-{
-	u64 reg;
-	u16 partid;
-	u8 errcode, pmg, ris;
-
-	if (WARN_ON_ONCE(!msc) ||
-	    WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(),
-					   &msc->accessibility)))
-		return IRQ_NONE;
-
-	reg = mpam_msc_read_esr(msc);
-
-	errcode = FIELD_GET(MPAMF_ESR_ERRCODE, reg);
-	if (!errcode)
-		return IRQ_NONE;
-
-	/* Clear level triggered irq */
-	mpam_msc_zero_esr(msc);
-
-	partid = FIELD_GET(MPAMF_ESR_PARTID_OR_MON, reg);
-	pmg = FIELD_GET(MPAMF_ESR_PMG, reg);
-	ris = FIELD_GET(MPAMF_ESR_PMG, reg);
-
-	pr_err("error irq from msc:%u '%s', partid:%u, pmg: %u, ris: %u\n",
-	       msc->id, mpam_errcode_names[errcode], partid, pmg, ris);
-
-	if (irq_is_percpu(irq)) {
-		mpam_disable_msc_ecr(msc);
-		schedule_work(&mpam_broken_work);
-		return IRQ_HANDLED;
-	}
-
-	return IRQ_WAKE_THREAD;
-}
-
-static irqreturn_t mpam_ppi_handler(int irq, void *dev_id)
-{
-	struct mpam_msc *msc = *(struct mpam_msc **)dev_id;
-
-	return __mpam_irq_handler(irq, msc);
-}
-
-static irqreturn_t mpam_spi_handler(int irq, void *dev_id)
-{
-	struct mpam_msc *msc = dev_id;
-
-	return __mpam_irq_handler(irq, msc);
-}
-
-static irqreturn_t mpam_disable_thread(int irq, void *dev_id);
-
-static int mpam_register_irqs(void)
-{
-	int err, irq;
-	struct mpam_msc *msc;
-
-	lockdep_assert_cpus_held();
-	lockdep_assert_held(&mpam_list_lock);
-
-	list_for_each_entry(msc, &mpam_all_msc, glbl_list) {
-		irq = platform_get_irq_byname_optional(msc->pdev, "error");
-		if (irq <= 0)
-			continue;
-
-		/* The MPAM spec says the interrupt can be SPI, PPI or LPI */
-		/* We anticipate sharing the interrupt with other MSCs */
-		if (irq_is_percpu(irq)) {
-			err = request_percpu_irq(irq, &mpam_ppi_handler,
-						 "mpam:msc:error",
-						 msc->error_dev_id);
-			if (err)
-				return err;
-
-			mutex_lock(&msc->lock);
-			msc->reenable_error_ppi = irq;
-			smp_call_function_many(&msc->accessibility,
-					       &_enable_percpu_irq, &irq,
-					       true);
-			mutex_unlock(&msc->lock);
-		} else {
-			err = devm_request_threaded_irq(&msc->pdev->dev, irq,
-							&mpam_spi_handler,
-							&mpam_disable_thread,
-							IRQF_SHARED,
-							"mpam:msc:error", msc);
-			if (err)
-				return err;
-		}
-
-		mutex_lock(&msc->lock);
-		msc->error_irq_requested = true;
-		mpam_touch_msc(msc, mpam_enable_msc_ecr, msc);
-		msc->error_irq_hw_enabled = true;
-		mutex_unlock(&msc->lock);
-	}
-
-	return 0;
-}
-
-static void mpam_unregister_irqs(void)
-{
-	int irq;
-	struct mpam_msc *msc;
-
-	cpus_read_lock();
-	/* take the lock as free_irq() can sleep */
-	mutex_lock(&mpam_list_lock);
-	list_for_each_entry(msc, &mpam_all_msc, glbl_list) {
-		irq = platform_get_irq_byname_optional(msc->pdev, "error");
-		if (irq <= 0)
-			continue;
-
-		mutex_lock(&msc->lock);
-		if (msc->error_irq_hw_enabled) {
-			mpam_touch_msc(msc, mpam_disable_msc_ecr, msc);
-			msc->error_irq_hw_enabled = false;
-		}
-
-		if (msc->error_irq_requested) {
-			if (irq_is_percpu(irq)) {
-				msc->reenable_error_ppi = 0;
-				free_percpu_irq(irq, msc->error_dev_id);
-			} else {
-				devm_free_irq(&msc->pdev->dev, irq, msc);
-			}
-			msc->error_irq_requested = false;
-		}
-		mutex_unlock(&msc->lock);
-	}
-	mutex_unlock(&mpam_list_lock);
-	cpus_read_unlock();
-}
-
 static void mpam_enable_once(void)
 {
-	int err;
-
-	/*
-	 * If all the MSC have been probed, enabling the IRQs happens next.
-	 * That involves cross-calling to a CPU that can reach the MSC, and
-	 * the locks must be taken in this order:
-	 */
-	cpus_read_lock();
 	mutex_lock(&mpam_list_lock);
 	mpam_enable_merge_features();
-
-	err = mpam_register_irqs();
-	if (err)
-		pr_warn("Failed to register irqs: %d\n", err);
-
 	mutex_unlock(&mpam_list_lock);
-	cpus_read_unlock();
-
-	if (err) {
-		schedule_work(&mpam_broken_work);
-		return;
-	}
 
 	mutex_lock(&mpam_cpuhp_state_lock);
 	cpuhp_remove_state(mpam_cpuhp_state);
@@ -1497,31 +1221,15 @@ static void mpam_reset_class(struct mpam_class *class)
  * All of MPAMs errors indicate a software bug, restore any modified
  * controls to their reset values.
  */
-static irqreturn_t mpam_disable_thread(int irq, void *dev_id)
+void mpam_disable(void)
 {
 	int idx;
 	struct mpam_class *class;
 
-	mutex_lock(&mpam_cpuhp_state_lock);
-	if (mpam_cpuhp_state) {
-		cpuhp_remove_state(mpam_cpuhp_state);
-		mpam_cpuhp_state = 0;
-	}
-	mutex_unlock(&mpam_cpuhp_state_lock);
-
-	mpam_unregister_irqs();
-
 	idx = srcu_read_lock(&mpam_srcu);
 	list_for_each_entry_rcu(class, &mpam_classes, classes_list)
 		mpam_reset_class(class);
 	srcu_read_unlock(&mpam_srcu, idx);
-
-	return IRQ_HANDLED;
-}
-
-void mpam_disable(struct work_struct *ignored)
-{
-	mpam_disable_thread(0, NULL);
 }
 
 /*
@@ -1535,6 +1243,7 @@ void mpam_enable(struct work_struct *work)
 	struct mpam_msc *msc;
 	bool all_devices_probed = true;
 
+	/* Have we probed all the hw devices? */
 	mutex_lock(&mpam_list_lock);
 	list_for_each_entry(msc, &mpam_all_msc, glbl_list) {
 		mutex_lock(&msc->lock);
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index b58d031d34e9..228d3c286f98 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -29,17 +29,10 @@ struct mpam_msc
 	struct pcc_mbox_chan	*pcc_chan;
 	u32			nrdy_usec;
 	cpumask_t		accessibility;
-	bool			has_extd_esr;
-
-	int				reenable_error_ppi;
-	struct mpam_msc * __percpu	*error_dev_id;
-
 	atomic_t		online_refs;
 
 	struct mutex		lock;
 	bool			probed;
-	bool			error_irq_requested;
-	bool			error_irq_hw_enabled;
 	u16			partid_max;
 	u8			pmg_max;
 	unsigned long		ris_idxs[128 / BITS_PER_LONG];
@@ -174,7 +167,6 @@ extern u8 mpam_pmg_max;
 
 /* Scheduled work callback to enable mpam once all MSC have been probed */
 void mpam_enable(struct work_struct *work);
-void mpam_disable(struct work_struct *work);
 
 /*
  * MPAM MSCs have the following register layout. See:
-- 
Gitee


From 540056cc105ff29dc66df6d822eba64e9271b6ce Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 100/280] anolis: Revert "arm_mpam: Extend reset logic to allow
 devices to be reset any time"

ANBZ: #31045

This reverts commit db8a81dbc5957c1ac1cea3dbb143c5cf5fdda2bd.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c | 34 ----------------------------
 1 file changed, 34 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 6091e87308ba..9156591fc4b9 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -1198,40 +1198,6 @@ static void mpam_enable_once(void)
 		READ_ONCE(mpam_partid_max) + 1, mpam_pmg_max + 1);
 }
 
-static void mpam_reset_class(struct mpam_class *class)
-{
-	int idx;
-	struct mpam_msc_ris *ris;
-	struct mpam_component *comp;
-
-	idx = srcu_read_lock(&mpam_srcu);
-	list_for_each_entry_rcu(comp, &class->components, class_list) {
-		list_for_each_entry_rcu(ris, &comp->ris, comp_list) {
-			mutex_lock(&ris->msc->lock);
-			mpam_touch_msc(ris->msc, mpam_reset_ris, ris);
-			mutex_unlock(&ris->msc->lock);
-			ris->in_reset_state = true;
-		}
-	}
-	srcu_read_unlock(&mpam_srcu, idx);
-}
-
-/*
- * Called in response to an error IRQ.
- * All of MPAMs errors indicate a software bug, restore any modified
- * controls to their reset values.
- */
-void mpam_disable(void)
-{
-	int idx;
-	struct mpam_class *class;
-
-	idx = srcu_read_lock(&mpam_srcu);
-	list_for_each_entry_rcu(class, &mpam_classes, classes_list)
-		mpam_reset_class(class);
-	srcu_read_unlock(&mpam_srcu, idx);
-}
-
 /*
  * Enable mpam once all devices have been probed.
  * Scheduled by mpam_discovery_cpu_online() once all devices have been created.
-- 
Gitee


From fdcc46895381286161a6e027c21936166647d5e7 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 101/280] anolis: Revert "arm_mpam: Add a helper to touch an
 MSC from any CPU"

ANBZ: #31045

This reverts commit 402fdf23a9bc86905d703ff2db9a97653d32844b.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c | 40 +++++-----------------------
 1 file changed, 6 insertions(+), 34 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 9156591fc4b9..e281e6e910e0 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -699,49 +699,21 @@ static void mpam_reset_ris_partid(struct mpam_msc_ris *ris, u16 partid)
 	spin_unlock(&msc->part_sel_lock);
 }
 
-/*
- * Called via smp_call_on_cpu() to prevent migration, while still being
- * pre-emptible.
- */
-static int mpam_reset_ris(void *arg)
+static void mpam_reset_ris(struct mpam_msc_ris *ris)
 {
 	u16 partid, partid_max;
-	struct mpam_msc_ris *ris = arg;
+	struct mpam_msc *msc = ris->msc;
+
+	lockdep_assert_held(&msc->lock);
 
 	if (ris->in_reset_state)
-		return 0;
+		return;
 
 	spin_lock(&partid_max_lock);
 	partid_max = mpam_partid_max;
 	spin_unlock(&partid_max_lock);
 	for (partid = 0; partid < partid_max; partid++)
 		mpam_reset_ris_partid(ris, partid);
-
-	return 0;
-}
-
-/*
- * Get the preferred CPU for this MSC. If it is accessible from this CPU,
- * this CPU is preferred. This can be preempted/migrated, it will only result
- * in more work.
- */
-static int mpam_get_msc_preferred_cpu(struct mpam_msc *msc)
-{
-	int cpu = raw_smp_processor_id();
-
-	if (cpumask_test_cpu(cpu, &msc->accessibility))
-		return cpu;
-
-	return cpumask_first_and(&msc->accessibility, cpu_online_mask);
-}
-
-static int mpam_touch_msc(struct mpam_msc *msc, int (*fn)(void *a), void *arg)
-{
-	lockdep_assert_irqs_enabled();
-	lockdep_assert_cpus_held();
-	lockdep_assert_held(&msc->lock);
-
-	return smp_call_on_cpu(mpam_get_msc_preferred_cpu(msc), fn, arg, true);
 }
 
 static void mpam_reset_msc(struct mpam_msc *msc, bool online)
@@ -753,7 +725,7 @@ static void mpam_reset_msc(struct mpam_msc *msc, bool online)
 
 	idx = srcu_read_lock(&mpam_srcu);
 	list_for_each_entry_rcu(ris, &msc->ris, msc_list) {
-		mpam_touch_msc(msc, &mpam_reset_ris, ris);
+		mpam_reset_ris(ris);
 
 		/*
 		 * Set in_reset_state when coming online. The reset state
-- 
Gitee


From 0b3f5748dee87d99e678a1f423e93aa0f94f0817 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 102/280] anolis: Revert "arm_mpam: Reset MSC controls from cpu
 hp callbacks"

ANBZ: #31045

This reverts commit 0f7f5e07299a317617f845f13cf7c47d19820619.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 126 +-------------------------
 drivers/platform/mpam/mpam_internal.h |   3 -
 2 files changed, 1 insertion(+), 128 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index e281e6e910e0..f1574f393e1d 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -7,7 +7,6 @@
 #include <linux/atomic.h>
 #include <linux/arm_mpam.h>
 #include <linux/bitfield.h>
-#include <linux/bitmap.h>
 #include <linux/cacheinfo.h>
 #include <linux/cpu.h>
 #include <linux/cpumask.h>
@@ -645,115 +644,8 @@ static int mpam_msc_hw_probe(struct mpam_msc *msc)
 	return 0;
 }
 
-static void mpam_reset_msc_bitmap(struct mpam_msc *msc, u16 reg, u16 wd)
-{
-	u32 num_words, msb;
-	u32 bm = ~0;
-	int i;
-
-	lockdep_assert_held(&msc->part_sel_lock);
-
-	/*
-	 * Write all ~0 to all but the last 32bit-word, which may
-	 * have fewer bits...
-	 */
-	num_words = DIV_ROUND_UP(wd, 32);
-	for (i = 0; i < num_words - 1; i++, reg += sizeof(bm))
-		__mpam_write_reg(msc, reg, bm);
-
-	/*
-	 * ....and then the last (maybe) partial 32bit word. When wd is a
-	 * multiple of 32, msb should be 31 to write a full 32bit word.
-	 */
-	msb = (wd - 1) % 32;
-	bm = GENMASK(msb , 0);
-	if (bm)
-		__mpam_write_reg(msc, reg, bm);
-}
-
-static void mpam_reset_ris_partid(struct mpam_msc_ris *ris, u16 partid)
-{
-	struct mpam_msc *msc = ris->msc;
-	u16 bwa_fract = MPAMCFG_MBW_MAX_MAX;
-	struct mpam_props *rprops = &ris->props;
-
-	lockdep_assert_held(&msc->lock);
-
-	spin_lock(&msc->part_sel_lock);
-	__mpam_part_sel(ris->ris_idx, partid, msc);
-
-	if (mpam_has_feature(mpam_feat_cpor_part, rprops))
-		mpam_reset_msc_bitmap(msc, MPAMCFG_CPBM, rprops->cpbm_wd);
-
-	if (mpam_has_feature(mpam_feat_mbw_part, rprops))
-		mpam_reset_msc_bitmap(msc, MPAMCFG_MBW_PBM, rprops->mbw_pbm_bits);
-
-	if (mpam_has_feature(mpam_feat_mbw_min, rprops))
-		mpam_write_partsel_reg(msc, MBW_MIN, 0);
-
-	if (mpam_has_feature(mpam_feat_mbw_max, rprops))
-		mpam_write_partsel_reg(msc, MBW_MAX, bwa_fract);
-
-	if (mpam_has_feature(mpam_feat_mbw_prop, rprops))
-		mpam_write_partsel_reg(msc, MBW_PROP, bwa_fract);
-	spin_unlock(&msc->part_sel_lock);
-}
-
-static void mpam_reset_ris(struct mpam_msc_ris *ris)
-{
-	u16 partid, partid_max;
-	struct mpam_msc *msc = ris->msc;
-
-	lockdep_assert_held(&msc->lock);
-
-	if (ris->in_reset_state)
-		return;
-
-	spin_lock(&partid_max_lock);
-	partid_max = mpam_partid_max;
-	spin_unlock(&partid_max_lock);
-	for (partid = 0; partid < partid_max; partid++)
-		mpam_reset_ris_partid(ris, partid);
-}
-
-static void mpam_reset_msc(struct mpam_msc *msc, bool online)
-{
-	int idx;
-	struct mpam_msc_ris *ris;
-
-	lockdep_assert_held(&msc->lock);
-
-	idx = srcu_read_lock(&mpam_srcu);
-	list_for_each_entry_rcu(ris, &msc->ris, msc_list) {
-		mpam_reset_ris(ris);
-
-		/*
-		 * Set in_reset_state when coming online. The reset state
-		 * for non-zero partid may be lost while the CPUs are offline.
-		 */
-		ris->in_reset_state = online;
-	}
-	srcu_read_unlock(&mpam_srcu, idx);
-}
-
 static int mpam_cpu_online(unsigned int cpu)
 {
-	int idx;
-	struct mpam_msc *msc;
-
-	idx = srcu_read_lock(&mpam_srcu);
-	list_for_each_entry_rcu(msc, &mpam_all_msc, glbl_list) {
-		if (!cpumask_test_cpu(cpu, &msc->accessibility))
-			continue;
-
-		if (atomic_fetch_inc(&msc->online_refs) == 0) {
-			mutex_lock(&msc->lock);
-			mpam_reset_msc(msc, true);
-			mutex_unlock(&msc->lock);
-		}
-	}
-	srcu_read_unlock(&mpam_srcu, idx);
-
 	return 0;
 }
 
@@ -792,22 +684,6 @@ static int mpam_discovery_cpu_online(unsigned int cpu)
 
 static int mpam_cpu_offline(unsigned int cpu)
 {
-	int idx;
-	struct mpam_msc *msc;
-
-	idx = srcu_read_lock(&mpam_srcu);
-	list_for_each_entry_rcu(msc, &mpam_all_msc, glbl_list) {
-		if (!cpumask_test_cpu(cpu, &msc->accessibility))
-			continue;
-
-		if (atomic_dec_and_test(&msc->online_refs)) {
-			mutex_lock(&msc->lock);
-			mpam_reset_msc(msc, false);
-			mutex_unlock(&msc->lock);
-		}
-	}
-	srcu_read_unlock(&mpam_srcu, idx);
-
 	return 0;
 }
 
@@ -1167,7 +1043,7 @@ static void mpam_enable_once(void)
 	mpam_register_cpuhp_callbacks(mpam_cpu_online);
 
 	pr_info("MPAM enabled with %u partid and %u pmg\n",
-		READ_ONCE(mpam_partid_max) + 1, mpam_pmg_max + 1);
+		mpam_partid_max + 1, mpam_pmg_max + 1);
 }
 
 /*
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index 228d3c286f98..db50f5e40d98 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -5,7 +5,6 @@
 #define MPAM_INTERNAL_H
 
 #include <linux/arm_mpam.h>
-#include <linux/atomic.h>
 #include <linux/cpumask.h>
 #include <linux/io.h>
 #include <linux/mailbox_client.h>
@@ -29,7 +28,6 @@ struct mpam_msc
 	struct pcc_mbox_chan	*pcc_chan;
 	u32			nrdy_usec;
 	cpumask_t		accessibility;
-	atomic_t		online_refs;
 
 	struct mutex		lock;
 	bool			probed;
@@ -142,7 +140,6 @@ struct mpam_msc_ris
 	u8			ris_idx;
 	u64			idr;
 	struct mpam_props	props;
-	bool			in_reset_state;
 
 	cpumask_t		affinity;
 
-- 
Gitee


From a226def13972e85051da343b1dccfe76f1407fb7 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 103/280] anolis: Revert "arm_mpam: Merge supported features
 during mpam_enable() into mpam_class"

ANBZ: #31045

This reverts commit b4c66f9d0cdd245dbdaa3f7e8af4a0edd8de0ef9.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 87 ---------------------------
 drivers/platform/mpam/mpam_internal.h |  8 ---
 2 files changed, 95 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index f1574f393e1d..7eeeb44506b1 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -938,95 +938,8 @@ static int mpam_msc_drv_probe(struct platform_device *pdev)
 	return err;
 }
 
-/*
- * If a resource doesn't match class feature/configuration, do the right thing.
- * For 'num' properties we can just take the minimum.
- * For properties where the mismatched unused bits would make a difference, we
- * nobble the class feature, as we can't configure all the resources.
- * e.g. The L3 cache is composed of two resources with 13 and 17 portion
- * bitmaps respectively.
- */
-static void
-__resource_props_mismatch(struct mpam_msc_ris *ris, struct mpam_class *class)
-{
-	struct mpam_props *cprops = &class->props;
-	struct mpam_props *rprops = &ris->props;
-
-	lockdep_assert_held(&mpam_list_lock); /* we modify class */
-
-	/* Clear missing features */
-	cprops->features &= rprops->features;
-
-	/* Clear incompatible features */
-	if (cprops->cpbm_wd != rprops->cpbm_wd)
-		mpam_clear_feature(mpam_feat_cpor_part, &cprops->features);
-	if (cprops->mbw_pbm_bits != rprops->mbw_pbm_bits)
-		mpam_clear_feature(mpam_feat_mbw_part, &cprops->features);
-
-	/* bwa_wd is a count of bits, fewer bits means less precision */
-	if (cprops->bwa_wd != rprops->bwa_wd)
-		cprops->bwa_wd = min(cprops->bwa_wd, rprops->bwa_wd);
-
-	/* For num properties, take the minimum */
-	if (cprops->num_csu_mon != rprops->num_csu_mon)
-		cprops->num_csu_mon = min(cprops->num_csu_mon, rprops->num_csu_mon);
-	if (cprops->num_mbwu_mon != rprops->num_mbwu_mon)
-		cprops->num_mbwu_mon = min(cprops->num_mbwu_mon, rprops->num_mbwu_mon);
-}
-
-/*
- * Copy the first component's first resources's properties and features to the
- * class. __resource_props_mismatch() will remove conflicts.
- * It is not possible to have a class with no components, or a component with
- * no resources.
- */
-static void mpam_enable_init_class_features(struct mpam_class *class)
-{
-	struct mpam_msc_ris *ris;
-	struct mpam_component *comp;
-
-	comp = list_first_entry_or_null(&class->components,
-					struct mpam_component, class_list);
-	if (WARN_ON(!comp))
-		return;
-
-	ris = list_first_entry_or_null(&comp->ris,
-				       struct mpam_msc_ris, comp_list);
-	if (WARN_ON(!ris))
-		return;
-
-	class->props = ris->props;
-}
-
-/* Merge all the common resource features into class. */
-static void mpam_enable_merge_features(void)
-{
-	struct mpam_msc_ris *ris;
-	struct mpam_class *class;
-	struct mpam_component *comp;
-
-	lockdep_assert_held(&mpam_list_lock);
-
-	list_for_each_entry(class, &mpam_classes, classes_list) {
-		mpam_enable_init_class_features(class);
-
-		list_for_each_entry(comp, &class->components, class_list) {
-			list_for_each_entry(ris, &comp->ris, comp_list) {
-				__resource_props_mismatch(ris, class);
-
-				class->nrdy_usec = max(class->nrdy_usec,
-						     ris->msc->nrdy_usec);
-			}
-		}
-	}
-}
-
 static void mpam_enable_once(void)
 {
-	mutex_lock(&mpam_list_lock);
-	mpam_enable_merge_features();
-	mutex_unlock(&mpam_list_lock);
-
 	mutex_lock(&mpam_cpuhp_state_lock);
 	cpuhp_remove_state(mpam_cpuhp_state);
 	mpam_cpuhp_state = 0;
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index db50f5e40d98..71e62594876d 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -97,12 +97,6 @@ static inline void mpam_set_feature(enum mpam_device_features feat,
 	props->features |= (1<<feat);
 }
 
-static inline void mpam_clear_feature(enum mpam_device_features feat,
-				      mpam_features_t *supported)
-{
-	*supported &= ~(1<<feat);
-}
-
 struct mpam_class
 {
 	/* mpam_components in this class */
@@ -110,8 +104,6 @@ struct mpam_class
 
 	cpumask_t		affinity;
 
-	struct mpam_props	props;
-	u32			nrdy_usec;
 	u8			level;
 	enum mpam_class_types	type;
 
-- 
Gitee


From 140fbb5e7761c2998a7c1f3489d5a3c69c544da0 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 104/280] anolis: Revert "arm_mpam: Probe the hardware features
 resctrl supports"

ANBZ: #31045

This reverts commit b8ee79d2897035cd4d881c1627881f680505c705.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 79 +--------------------------
 drivers/platform/mpam/mpam_internal.h | 50 -----------------
 2 files changed, 2 insertions(+), 127 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 7eeeb44506b1..ec22c279cfe9 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -83,7 +83,7 @@ LIST_HEAD(mpam_classes);
 
 static u32 __mpam_read_reg(struct mpam_msc *msc, u16 reg)
 {
-	WARN_ON_ONCE(reg + sizeof(u32) > msc->mapped_hwpage_sz);
+	WARN_ON_ONCE(reg > msc->mapped_hwpage_sz);
 	WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(), &msc->accessibility));
 
 	return readl_relaxed(msc->mapped_hwpage + reg);
@@ -91,7 +91,7 @@ static u32 __mpam_read_reg(struct mpam_msc *msc, u16 reg)
 
 static void __mpam_write_reg(struct mpam_msc *msc, u16 reg, u32 val)
 {
-	WARN_ON_ONCE(reg + sizeof(u32) > msc->mapped_hwpage_sz);
+	WARN_ON_ONCE(reg > msc->mapped_hwpage_sz);
 	WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(), &msc->accessibility));
 
 	writel_relaxed(val, msc->mapped_hwpage + reg);
@@ -516,74 +516,6 @@ static struct mpam_msc_ris *mpam_get_or_create_ris(struct mpam_msc *msc,
 	return found;
 }
 
-static void mpam_ris_hw_probe(struct mpam_msc_ris *ris)
-{
-	int err;
-	struct mpam_msc *msc = ris->msc;
-	struct mpam_props *props = &ris->props;
-
-	lockdep_assert_held(&msc->lock);
-	lockdep_assert_held(&msc->part_sel_lock);
-
-	/* Cache Portion partitioning */
-	if (FIELD_GET(MPAMF_IDR_HAS_CPOR_PART, ris->idr)) {
-		u32 cpor_features = mpam_read_partsel_reg(msc, CPOR_IDR);
-
-		props->cpbm_wd = FIELD_GET(MPAMF_CPOR_IDR_CPBM_WD, cpor_features);
-		if (props->cpbm_wd)
-			mpam_set_feature(mpam_feat_cpor_part, props);
-	}
-
-	/* Memory bandwidth partitioning */
-	if (FIELD_GET(MPAMF_IDR_HAS_MBW_PART, ris->idr)) {
-		u32 mbw_features = mpam_read_partsel_reg(msc, MBW_IDR);
-
-		/* portion bitmap resolution */
-		props->mbw_pbm_bits = FIELD_GET(MPAMF_MBW_IDR_BWPBM_WD, mbw_features);
-		if (props->mbw_pbm_bits &&
-		    FIELD_GET(MPAMF_MBW_IDR_HAS_PBM, mbw_features))
-			mpam_set_feature(mpam_feat_mbw_part, props);
-
-		props->bwa_wd = FIELD_GET(MPAMF_MBW_IDR_BWA_WD, mbw_features);
-		if (props->bwa_wd && FIELD_GET(MPAMF_MBW_IDR_HAS_MAX, mbw_features))
-			mpam_set_feature(mpam_feat_mbw_max, props);
-	}
-
-	/* Performance Monitoring */
-	if (FIELD_GET(MPAMF_IDR_HAS_MSMON, ris->idr)) {
-		u32 msmon_features = mpam_read_partsel_reg(msc, MSMON_IDR);
-
-		if (FIELD_GET(MPAMF_MSMON_IDR_MSMON_CSU, msmon_features)) {
-			u32 csumonidr, discard;
-
-			/*
-			 * If the firmware max-nrdy-us property is missing, the
-			 * CSU counters can't be used. Should we wait forever?
-			 */
-			err = device_property_read_u32(&msc->pdev->dev,
-						       "arm,not-ready-us",
-						       &discard);
-
-			csumonidr = mpam_read_partsel_reg(msc, CSUMON_IDR);
-			props->num_csu_mon = FIELD_GET(MPAMF_CSUMON_IDR_NUM_MON, csumonidr);
-			if (props->num_csu_mon && !err)
-				mpam_set_feature(mpam_feat_msmon_csu, props);
-			else if (props->num_csu_mon)
-				pr_err_once("Counters are not usable because not-ready timeout was not provided by firmware.");
-		}
-		if (FIELD_GET(MPAMF_MSMON_IDR_MSMON_MBWU, msmon_features)) {
-			u32 mbwumonidr = mpam_read_partsel_reg(msc, MBWUMON_IDR);
-
-			props->num_mbwu_mon = FIELD_GET(MPAMF_MBWUMON_IDR_NUM_MON, mbwumonidr);
-			if (props->num_mbwu_mon)
-				mpam_set_feature(mpam_feat_msmon_mbwu, props);
-
-			if (FIELD_GET(MPAMF_MBWUMON_IDR_HAS_RWBW, mbwumonidr))
-				mpam_set_feature(mpam_feat_msmon_mbwu_rwbw, props);
-		}
-	}
-}
-
 static int mpam_msc_hw_probe(struct mpam_msc *msc)
 {
 	u64 idr;
@@ -604,7 +536,6 @@ static int mpam_msc_hw_probe(struct mpam_msc *msc)
 
 	idr = mpam_msc_read_idr(msc);
 	spin_unlock(&msc->part_sel_lock);
-
 	msc->ris_max = FIELD_GET(MPAMF_IDR_RIS_MAX, idr);
 
 	/* Use these values so partid/pmg always starts with a valid value */
@@ -626,12 +557,6 @@ static int mpam_msc_hw_probe(struct mpam_msc *msc)
 		if (IS_ERR(ris)) {
 			return PTR_ERR(ris);
 		}
-		ris->idr = idr;
-
-		spin_lock(&msc->part_sel_lock);
-		__mpam_part_sel(ris_idx, 0, msc);
-		mpam_ris_hw_probe(ris);
-		spin_unlock(&msc->part_sel_lock);
 	}
 
 	spin_lock(&partid_max_lock);
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index 71e62594876d..a7de4a69b9f8 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -49,54 +49,6 @@ struct mpam_msc
 	size_t			mapped_hwpage_sz;
 };
 
-/*
- * When we compact the supported features, we don't care what they are.
- * Storing them as a bitmap makes life easy.
- */
-typedef u16 mpam_features_t;
-
-/* Bits for mpam_features_t */
-enum mpam_device_features {
-	mpam_feat_ccap_part = 0,
-	mpam_feat_cpor_part,
-	mpam_feat_mbw_part,
-	mpam_feat_mbw_min,
-	mpam_feat_mbw_max,
-	mpam_feat_mbw_prop,
-	mpam_feat_msmon,
-	mpam_feat_msmon_csu,
-	mpam_feat_msmon_csu_capture,
-	mpam_feat_msmon_mbwu,
-	mpam_feat_msmon_mbwu_capture,
-	mpam_feat_msmon_mbwu_rwbw,
-	mpam_feat_msmon_capt,
-	MPAM_FEATURE_LAST,
-};
-#define MPAM_ALL_FEATURES      ((1<<MPAM_FEATURE_LAST) - 1)
-
-struct mpam_props
-{
-	mpam_features_t		features;
-
-	u16			cpbm_wd;
-	u16			mbw_pbm_bits;
-	u8			bwa_wd;
-	u16			num_csu_mon;
-	u16			num_mbwu_mon;
-};
-
-static inline bool mpam_has_feature(enum mpam_device_features feat,
-				    struct mpam_props *props)
-{
-	return (1<<feat) & props->features;
-}
-
-static inline void mpam_set_feature(enum mpam_device_features feat,
-				    struct mpam_props *props)
-{
-	props->features |= (1<<feat);
-}
-
 struct mpam_class
 {
 	/* mpam_components in this class */
@@ -130,8 +82,6 @@ struct mpam_component
 struct mpam_msc_ris
 {
 	u8			ris_idx;
-	u64			idr;
-	struct mpam_props	props;
 
 	cpumask_t		affinity;
 
-- 
Gitee


From 280426a616e49fecb44ec8c2e424ee8cb4cba0ce Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 105/280] anolis: Revert "arm_mpam: Probe MSCs to find the
 supported partid/pmg values"

ANBZ: #31045

This reverts commit 1ea287bb0904f2c769304001da65d20f701b0b8f.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/arm64/kernel/mpam.c              |  11 --
 drivers/platform/mpam/mpam_devices.c  | 166 ++------------------------
 drivers/platform/mpam/mpam_internal.h |   6 -
 include/linux/arm_mpam.h              |   2 -
 4 files changed, 7 insertions(+), 178 deletions(-)

diff --git a/arch/arm64/kernel/mpam.c b/arch/arm64/kernel/mpam.c
index 02f43334f078..346f0273b2c5 100644
--- a/arch/arm64/kernel/mpam.c
+++ b/arch/arm64/kernel/mpam.c
@@ -3,7 +3,6 @@
 
 #include <asm/mpam.h>
 
-#include <linux/arm_mpam.h>
 #include <linux/jump_label.h>
 #include <linux/percpu.h>
 
@@ -11,13 +10,3 @@ DEFINE_STATIC_KEY_FALSE(arm64_mpam_has_hcr);
 DEFINE_STATIC_KEY_FALSE(mpam_enabled);
 DEFINE_PER_CPU(u64, arm64_mpam_default);
 DEFINE_PER_CPU(u64, arm64_mpam_current);
-
-static int __init arm64_mpam_register_cpus(void)
-{
-	u64 mpamidr = read_sanitised_ftr_reg(SYS_MPAMIDR_EL1);
-	u16 partid_max = FIELD_GET(MPAMIDR_PARTID_MAX, mpamidr);
-	u8 pmg_max = FIELD_GET(MPAMIDR_PMG_MAX, mpamidr);
-
-	return mpam_register_requestor(partid_max, pmg_max);
-}
-arch_initcall(arm64_mpam_register_cpus)
diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index ec22c279cfe9..48811c90b78a 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -6,7 +6,6 @@
 #include <linux/acpi.h>
 #include <linux/atomic.h>
 #include <linux/arm_mpam.h>
-#include <linux/bitfield.h>
 #include <linux/cacheinfo.h>
 #include <linux/cpu.h>
 #include <linux/cpumask.h>
@@ -47,15 +46,6 @@ static u32 mpam_num_msc;
 static int mpam_cpuhp_state;
 static DEFINE_MUTEX(mpam_cpuhp_state_lock);
 
-/*
- * The smallest common values for any CPU or MSC in the system.
- * Generating traffic outside this range will result in screaming interrupts.
- */
-u16 mpam_partid_max;
-u8 mpam_pmg_max;
-static bool partid_max_init, partid_max_published;
-static DEFINE_SPINLOCK(partid_max_lock);
-
 /*
  * mpam is enabled once all devices have been probed from CPU online callbacks,
  * scheduled via this work_struct. If access to an MSC depends on a CPU that
@@ -89,14 +79,6 @@ static u32 __mpam_read_reg(struct mpam_msc *msc, u16 reg)
 	return readl_relaxed(msc->mapped_hwpage + reg);
 }
 
-static void __mpam_write_reg(struct mpam_msc *msc, u16 reg, u32 val)
-{
-	WARN_ON_ONCE(reg > msc->mapped_hwpage_sz);
-	WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(), &msc->accessibility));
-
-	writel_relaxed(val, msc->mapped_hwpage + reg);
-}
-
 #define mpam_read_partsel_reg(msc, reg)			\
 ({							\
 	u32 ____ret;					\
@@ -107,59 +89,6 @@ static void __mpam_write_reg(struct mpam_msc *msc, u16 reg, u32 val)
 	____ret;					\
 })
 
-#define mpam_write_partsel_reg(msc, reg, val)			\
-({								\
-	lockdep_assert_held_once(&msc->part_sel_lock);		\
-	__mpam_write_reg(msc, MPAMCFG_##reg, val);		\
-})
-
-static u64 mpam_msc_read_idr(struct mpam_msc *msc)
-{
-	u64 idr_high = 0, idr_low;
-
-	lockdep_assert_held(&msc->part_sel_lock);
-
-	idr_low = mpam_read_partsel_reg(msc, IDR);
-	if (FIELD_GET(MPAMF_IDR_HAS_EXT, idr_low))
-		idr_high = mpam_read_partsel_reg(msc, IDR + 4);
-
-	return (idr_high << 32) | idr_low;
-}
-
-static void __mpam_part_sel(u8 ris_idx, u16 partid, struct mpam_msc *msc)
-{
-	u32 partsel;
-
-	lockdep_assert_held(&msc->part_sel_lock);
-
-	partsel = FIELD_PREP(MPAMCFG_PART_SEL_RIS, ris_idx) |
-		  FIELD_PREP(MPAMCFG_PART_SEL_PARTID_SEL, partid);
-	mpam_write_partsel_reg(msc, PART_SEL, partsel);
-}
-
-int mpam_register_requestor(u16 partid_max, u8 pmg_max)
-{
-	int err = 0;
-
-	spin_lock(&partid_max_lock);
-	if (!partid_max_init) {
-		mpam_partid_max = partid_max;
-		mpam_pmg_max = pmg_max;
-		partid_max_init = true;
-	} else if (!partid_max_published) {
-		mpam_partid_max = min(mpam_partid_max, partid_max);
-		mpam_pmg_max = min(mpam_pmg_max, pmg_max);
-	} else {
-		/* New requestors can't lower the values */
-		if ((partid_max < mpam_partid_max) || (pmg_max < mpam_pmg_max))
-			err = -EBUSY;
-	}
-	spin_unlock(&partid_max_lock);
-
-	return err;
-}
-EXPORT_SYMBOL(mpam_register_requestor);
-
 static struct mpam_component *
 mpam_component_alloc(struct mpam_class *class, int id, gfp_t gfp)
 {
@@ -473,7 +402,6 @@ static int mpam_ris_create_locked(struct mpam_msc *msc, u8 ris_idx,
 	cpumask_or(&comp->affinity, &comp->affinity, &ris->affinity);
 	cpumask_or(&class->affinity, &class->affinity, &ris->affinity);
 	list_add_rcu(&ris->comp_list, &comp->ris);
-	list_add_rcu(&ris->msc_list, &msc->ris);
 
 	return 0;
 }
@@ -491,37 +419,10 @@ int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
 	return err;
 }
 
-static struct mpam_msc_ris *mpam_get_or_create_ris(struct mpam_msc *msc,
-						   u8 ris_idx)
-{
-	int err;
-	struct mpam_msc_ris *ris, *found = ERR_PTR(-ENOENT);
-
-	lockdep_assert_held(&mpam_list_lock);
-
-	if (!test_bit(ris_idx, msc->ris_idxs)) {
-		err = mpam_ris_create_locked(msc, ris_idx, MPAM_CLASS_UNKNOWN,
-					     0, 0, GFP_ATOMIC);
-		if (err)
-			return ERR_PTR(err);
-	}
-
-	list_for_each_entry(ris, &msc->ris, msc_list) {
-		if (ris->ris_idx == ris_idx) {
-			found = ris;
-			break;
-		}
-	}
-
-	return found;
-}
-
 static int mpam_msc_hw_probe(struct mpam_msc *msc)
 {
 	u64 idr;
-	u16 partid_max;
-	u8 ris_idx, pmg_max;
-	struct mpam_msc_ris *ris;
+	int err;
 
 	lockdep_assert_held(&msc->lock);
 
@@ -530,43 +431,14 @@ static int mpam_msc_hw_probe(struct mpam_msc *msc)
 	if ((idr & MPAMF_AIDR_ARCH_MAJOR_REV) != MPAM_ARCHITECTURE_V1) {
 		pr_err_once("%s does not match MPAM architecture v1.0\n",
 			    dev_name(&msc->pdev->dev));
-		spin_unlock(&msc->part_sel_lock);
-		return -EIO;
+		err = -EIO;
+	} else {
+		msc->probed = true;
+		err = 0;
 	}
-
-	idr = mpam_msc_read_idr(msc);
 	spin_unlock(&msc->part_sel_lock);
-	msc->ris_max = FIELD_GET(MPAMF_IDR_RIS_MAX, idr);
-
-	/* Use these values so partid/pmg always starts with a valid value */
-	msc->partid_max = FIELD_GET(MPAMF_IDR_PARTID_MAX, idr);
-	msc->pmg_max = FIELD_GET(MPAMF_IDR_PMG_MAX, idr);
-
-	for (ris_idx = 0; ris_idx <= msc->ris_max; ris_idx++) {
-		spin_lock(&msc->part_sel_lock);
-		__mpam_part_sel(ris_idx, 0, msc);
-		idr = mpam_msc_read_idr(msc);
-		spin_unlock(&msc->part_sel_lock);
-
-		partid_max = FIELD_GET(MPAMF_IDR_PARTID_MAX, idr);
-		pmg_max = FIELD_GET(MPAMF_IDR_PMG_MAX, idr);
-		msc->partid_max = min(msc->partid_max, partid_max);
-		msc->pmg_max = min(msc->pmg_max, pmg_max);
-
-		ris = mpam_get_or_create_ris(msc, ris_idx);
-		if (IS_ERR(ris)) {
-			return PTR_ERR(ris);
-		}
-	}
-
-	spin_lock(&partid_max_lock);
-	mpam_partid_max = min(mpam_partid_max, msc->partid_max);
-	mpam_pmg_max = min(mpam_pmg_max, msc->pmg_max);
-	spin_unlock(&partid_max_lock);
-
-	msc->probed = true;
 
-	return 0;
+	return err;
 }
 
 static int mpam_cpu_online(unsigned int cpu)
@@ -870,18 +742,9 @@ static void mpam_enable_once(void)
 	mpam_cpuhp_state = 0;
 	mutex_unlock(&mpam_cpuhp_state_lock);
 
-	/*
-	 * Once the cpuhp callbacks have been changed, mpam_partid_max can no
-	 * longer change.
-	 */
-	spin_lock(&partid_max_lock);
-	partid_max_published = true;
-	spin_unlock(&partid_max_lock);
-
 	mpam_register_cpuhp_callbacks(mpam_cpu_online);
 
-	pr_info("MPAM enabled with %u partid and %u pmg\n",
-		mpam_partid_max + 1, mpam_pmg_max + 1);
+	pr_info("MPAM enabled\n");
 }
 
 /*
@@ -965,25 +828,11 @@ static void mpam_dt_create_foundling_msc(void)
 
 static int __init mpam_msc_driver_init(void)
 {
-	bool mpam_not_available = false;
-
 	if (!mpam_cpus_have_feature())
 		return -EOPNOTSUPP;
 
 	init_srcu_struct(&mpam_srcu);
 
-	/*
-	 * If the MPAM CPU interface is not implemented, or reserved by
-	 * firmware, there is no point touching the rest of the hardware.
-	 */
-	spin_lock(&partid_max_lock);
-	if (!partid_max_init || (!mpam_partid_max && !mpam_pmg_max))
-		mpam_not_available = true;
-	spin_unlock(&partid_max_lock);
-
-	if (mpam_not_available)
-		return 0;
-
 	if (!acpi_disabled)
 		fw_num_msc = acpi_mpam_count_msc();
 	else
@@ -999,5 +848,4 @@ static int __init mpam_msc_driver_init(void)
 
 	return platform_driver_register(&mpam_msc_driver);
 }
-/* Must occur after arm64_mpam_register_cpus() from arch_initcall() */
 subsys_initcall(mpam_msc_driver_init);
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index a7de4a69b9f8..d5d567fe57ed 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -31,8 +31,6 @@ struct mpam_msc
 
 	struct mutex		lock;
 	bool			probed;
-	u16			partid_max;
-	u8			pmg_max;
 	unsigned long		ris_idxs[128 / BITS_PER_LONG];
 	u32			ris_max;
 
@@ -100,10 +98,6 @@ struct mpam_msc_ris
 extern struct list_head mpam_classes;
 extern struct srcu_struct mpam_srcu;
 
-/* System wide partid/pmg values */
-extern u16 mpam_partid_max;
-extern u8 mpam_pmg_max;
-
 /* Scheduled work callback to enable mpam once all MSC have been probed */
 void mpam_enable(struct work_struct *work);
 
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index 40e09b4d236b..950ea7049d53 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -34,8 +34,6 @@ static inline int acpi_mpam_parse_resources(struct mpam_msc *msc,
 static inline int acpi_mpam_count_msc(void) { return -EINVAL; }
 #endif
 
-int mpam_register_requestor(u16 partid_max, u8 pmg_max);
-
 int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
 		    enum mpam_class_types type, u8 class_id, int component_id);
 
-- 
Gitee


From 3237079158eb43443cf9f6b146d37baa5d4adcfe Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 106/280] anolis: Revert "arm_mpam: Add cpuhp callbacks to
 probe MSC hardware"

ANBZ: #31045

This reverts commit f26020c6a1b1ea5cc0036b3b37046c8491de5381.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 148 +-------------------------
 drivers/platform/mpam/mpam_internal.h |   5 +-
 2 files changed, 4 insertions(+), 149 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 48811c90b78a..599bd4ee5b00 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -4,7 +4,6 @@
 #define pr_fmt(fmt) "mpam: " fmt
 
 #include <linux/acpi.h>
-#include <linux/atomic.h>
 #include <linux/arm_mpam.h>
 #include <linux/cacheinfo.h>
 #include <linux/cpu.h>
@@ -22,7 +21,6 @@
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
-#include <linux/workqueue.h>
 
 #include <acpi/pcc.h>
 
@@ -43,16 +41,6 @@ struct srcu_struct mpam_srcu;
 /* MPAM isn't available until all the MSC have been probed. */
 static u32 mpam_num_msc;
 
-static int mpam_cpuhp_state;
-static DEFINE_MUTEX(mpam_cpuhp_state_lock);
-
-/*
- * mpam is enabled once all devices have been probed from CPU online callbacks,
- * scheduled via this work_struct. If access to an MSC depends on a CPU that
- * was not brought online at boot, this can happen surprisingly late.
- */
-static DECLARE_WORK(mpam_enable_work, &mpam_enable);
-
 /*
  * An MSC is a container for resources, each identified by their RIS index.
  * Components are a group of RIS that control the same thing.
@@ -71,24 +59,6 @@ static DECLARE_WORK(mpam_enable_work, &mpam_enable);
  */
 LIST_HEAD(mpam_classes);
 
-static u32 __mpam_read_reg(struct mpam_msc *msc, u16 reg)
-{
-	WARN_ON_ONCE(reg > msc->mapped_hwpage_sz);
-	WARN_ON_ONCE(!cpumask_test_cpu(smp_processor_id(), &msc->accessibility));
-
-	return readl_relaxed(msc->mapped_hwpage + reg);
-}
-
-#define mpam_read_partsel_reg(msc, reg)			\
-({							\
-	u32 ____ret;					\
-							\
-	lockdep_assert_held_once(&msc->part_sel_lock);	\
-	____ret = __mpam_read_reg(msc, MPAMF_##reg);	\
-							\
-	____ret;					\
-})
-
 static struct mpam_component *
 mpam_component_alloc(struct mpam_class *class, int id, gfp_t gfp)
 {
@@ -419,81 +389,9 @@ int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
 	return err;
 }
 
-static int mpam_msc_hw_probe(struct mpam_msc *msc)
-{
-	u64 idr;
-	int err;
-
-	lockdep_assert_held(&msc->lock);
-
-	spin_lock(&msc->part_sel_lock);
-	idr = mpam_read_partsel_reg(msc, AIDR);
-	if ((idr & MPAMF_AIDR_ARCH_MAJOR_REV) != MPAM_ARCHITECTURE_V1) {
-		pr_err_once("%s does not match MPAM architecture v1.0\n",
-			    dev_name(&msc->pdev->dev));
-		err = -EIO;
-	} else {
-		msc->probed = true;
-		err = 0;
-	}
-	spin_unlock(&msc->part_sel_lock);
-
-	return err;
-}
-
-static int mpam_cpu_online(unsigned int cpu)
+static void mpam_discovery_complete(void)
 {
-	return 0;
-}
-
-/* Before mpam is enabled, try to probe new MSC */
-static int mpam_discovery_cpu_online(unsigned int cpu)
-{
-	int err = 0;
-	struct mpam_msc *msc;
-	bool new_device_probed = false;
-
-	mutex_lock(&mpam_list_lock);
-	list_for_each_entry(msc, &mpam_all_msc, glbl_list) {
-		if (!cpumask_test_cpu(cpu, &msc->accessibility))
-			continue;
-
-		mutex_lock(&msc->lock);
-		if (!msc->probed)
-			err = mpam_msc_hw_probe(msc);
-		mutex_unlock(&msc->lock);
-
-		if (!err)
-			new_device_probed = true;
-		else
-			break; // mpam_broken
-	}
-	mutex_unlock(&mpam_list_lock);
-
-	if (new_device_probed && !err)
-		schedule_work(&mpam_enable_work);
-
-	if (err < 0)
-		return err;
-
-	return mpam_cpu_online(cpu);
-}
-
-static int mpam_cpu_offline(unsigned int cpu)
-{
-	return 0;
-}
-
-static void mpam_register_cpuhp_callbacks(int (*online)(unsigned int online))
-{
-	mutex_lock(&mpam_cpuhp_state_lock);
-	mpam_cpuhp_state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "mpam:online",
-					     online, mpam_cpu_offline);
-	if (mpam_cpuhp_state <= 0) {
-		pr_err("Failed to register cpuhp callbacks");
-		mpam_cpuhp_state = 0;
-	}
-	mutex_unlock(&mpam_cpuhp_state_lock);
+	pr_err("Discovered all MSC\n");
 }
 
 static int mpam_dt_count_msc(void)
@@ -730,51 +628,11 @@ static int mpam_msc_drv_probe(struct platform_device *pdev)
 	}
 
 	if (!err && fw_num_msc == mpam_num_msc)
-		mpam_register_cpuhp_callbacks(&mpam_discovery_cpu_online);
+		mpam_discovery_complete();
 
 	return err;
 }
 
-static void mpam_enable_once(void)
-{
-	mutex_lock(&mpam_cpuhp_state_lock);
-	cpuhp_remove_state(mpam_cpuhp_state);
-	mpam_cpuhp_state = 0;
-	mutex_unlock(&mpam_cpuhp_state_lock);
-
-	mpam_register_cpuhp_callbacks(mpam_cpu_online);
-
-	pr_info("MPAM enabled\n");
-}
-
-/*
- * Enable mpam once all devices have been probed.
- * Scheduled by mpam_discovery_cpu_online() once all devices have been created.
- * Also scheduled when new devices are probed when new CPUs come online.
- */
-void mpam_enable(struct work_struct *work)
-{
-	static atomic_t once;
-	struct mpam_msc *msc;
-	bool all_devices_probed = true;
-
-	/* Have we probed all the hw devices? */
-	mutex_lock(&mpam_list_lock);
-	list_for_each_entry(msc, &mpam_all_msc, glbl_list) {
-		mutex_lock(&msc->lock);
-		if (!msc->probed)
-			all_devices_probed = false;
-		mutex_unlock(&msc->lock);
-
-		if (!all_devices_probed)
-			break;
-	}
-	mutex_unlock(&mpam_list_lock);
-
-	if (all_devices_probed && !atomic_fetch_inc(&once))
-		mpam_enable_once();
-}
-
 static int mpam_msc_drv_remove(struct platform_device *pdev)
 {
 	struct mpam_msc *msc = platform_get_drvdata(pdev);
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index d5d567fe57ed..5d339e4375e2 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -30,7 +30,6 @@ struct mpam_msc
 	cpumask_t		accessibility;
 
 	struct mutex		lock;
-	bool			probed;
 	unsigned long		ris_idxs[128 / BITS_PER_LONG];
 	u32			ris_max;
 
@@ -98,8 +97,6 @@ struct mpam_msc_ris
 extern struct list_head mpam_classes;
 extern struct srcu_struct mpam_srcu;
 
-/* Scheduled work callback to enable mpam once all MSC have been probed */
-void mpam_enable(struct work_struct *work);
 
 /*
  * MPAM MSCs have the following register layout. See:
@@ -199,7 +196,7 @@ void mpam_enable(struct work_struct *work);
 
 /* MPAMF_MBWUMON_IDR - MPAM memory bandwidth usage monitor ID register */
 #define MPAMF_MBWUMON_IDR_NUM_MON       GENMASK(15, 0)
-#define MPAMF_MBWUMON_IDR_HAS_RWBW      BIT(28)
+#define MPAMF_MBWUMON_IDR_RWBW           BIT(28)
 #define MPAMF_MBWUMON_IDR_LWD           BIT(29)
 #define MPAMF_MBWUMON_IDR_HAS_LONG      BIT(30)
 #define MPAMF_MBWUMON_IDR_HAS_CAPTURE   BIT(31)
-- 
Gitee


From fa166a1c770fcd425b1bda6523dd2f62608260e6 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 107/280] anolis: Revert "arm_mpam: Add MPAM MSC register
 layout definitions"

ANBZ: #31045

This reverts commit eaf270b3fb89ae9381bf8a8400038c2fa009cb5f.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_internal.h | 254 --------------------------
 1 file changed, 254 deletions(-)

diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index 5d339e4375e2..07d9c70bf1e6 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -97,258 +97,4 @@ struct mpam_msc_ris
 extern struct list_head mpam_classes;
 extern struct srcu_struct mpam_srcu;
 
-
-/*
- * MPAM MSCs have the following register layout. See:
- * Arm Architecture Reference Manual Supplement - Memory System Resource
- * Partitioning and Monitoring (MPAM), for Armv8-A. DDI 0598A.a
- */
-#define MPAM_ARCHITECTURE_V1    0x10
-
-/* Memory mapped control pages: */
-/* ID Register offsets in the memory mapped page */
-#define MPAMF_IDR               0x0000  /* features id register */
-#define MPAMF_MSMON_IDR         0x0080  /* performance monitoring features */
-#define MPAMF_IMPL_IDR          0x0028  /* imp-def partitioning */
-#define MPAMF_CPOR_IDR          0x0030  /* cache-portion partitioning */
-#define MPAMF_CCAP_IDR          0x0038  /* cache-capacity partitioning */
-#define MPAMF_MBW_IDR           0x0040  /* mem-bw partitioning */
-#define MPAMF_PRI_IDR           0x0048  /* priority partitioning */
-#define MPAMF_CSUMON_IDR        0x0088  /* cache-usage monitor */
-#define MPAMF_MBWUMON_IDR       0x0090  /* mem-bw usage monitor */
-#define MPAMF_PARTID_NRW_IDR    0x0050  /* partid-narrowing */
-#define MPAMF_IIDR              0x0018  /* implementer id register */
-#define MPAMF_AIDR              0x0020  /* architectural id register */
-
-/* Configuration and Status Register offsets in the memory mapped page */
-#define MPAMCFG_PART_SEL        0x0100  /* partid to configure: */
-#define MPAMCFG_CPBM            0x1000  /* cache-portion config */
-#define MPAMCFG_CMAX            0x0108  /* cache-capacity config */
-#define MPAMCFG_MBW_MIN         0x0200  /* min mem-bw config */
-#define MPAMCFG_MBW_MAX         0x0208  /* max mem-bw config */
-#define MPAMCFG_MBW_WINWD       0x0220  /* mem-bw accounting window config */
-#define MPAMCFG_MBW_PBM         0x2000  /* mem-bw portion bitmap config */
-#define MPAMCFG_PRI             0x0400  /* priority partitioning config */
-#define MPAMCFG_MBW_PROP        0x0500  /* mem-bw stride config */
-#define MPAMCFG_INTPARTID       0x0600  /* partid-narrowing config */
-
-#define MSMON_CFG_MON_SEL       0x0800  /* monitor selector */
-#define MSMON_CFG_CSU_FLT       0x0810  /* cache-usage monitor filter */
-#define MSMON_CFG_CSU_CTL       0x0818  /* cache-usage monitor config */
-#define MSMON_CFG_MBWU_FLT      0x0820  /* mem-bw monitor filter */
-#define MSMON_CFG_MBWU_CTL      0x0828  /* mem-bw monitor config */
-#define MSMON_CSU               0x0840  /* current cache-usage */
-#define MSMON_CSU_CAPTURE       0x0848  /* last cache-usage value captured */
-#define MSMON_MBWU              0x0860  /* current mem-bw usage value */
-#define MSMON_MBWU_CAPTURE      0x0868  /* last mem-bw value captured */
-#define MSMON_CAPT_EVNT         0x0808  /* signal a capture event */
-#define MPAMF_ESR               0x00F8  /* error status register */
-#define MPAMF_ECR               0x00F0  /* error control register */
-
-/* MPAMF_IDR - MPAM features ID register */
-#define MPAMF_IDR_PARTID_MAX            GENMASK(15, 0)
-#define MPAMF_IDR_PMG_MAX               GENMASK(23, 16)
-#define MPAMF_IDR_HAS_CCAP_PART         BIT(24)
-#define MPAMF_IDR_HAS_CPOR_PART         BIT(25)
-#define MPAMF_IDR_HAS_MBW_PART          BIT(26)
-#define MPAMF_IDR_HAS_PRI_PART          BIT(27)
-#define MPAMF_IDR_HAS_EXT               BIT(28)
-#define MPAMF_IDR_HAS_IMPL_IDR          BIT(29)
-#define MPAMF_IDR_HAS_MSMON             BIT(30)
-#define MPAMF_IDR_HAS_PARTID_NRW        BIT(31)
-#define MPAMF_IDR_HAS_RIS               BIT(32)
-#define MPAMF_IDR_HAS_EXT_ESR           BIT(38)
-#define MPAMF_IDR_HAS_ESR               BIT(39)
-#define MPAMF_IDR_RIS_MAX               GENMASK(59, 56)
-
-
-/* MPAMF_MSMON_IDR - MPAM performance monitoring ID register */
-#define MPAMF_MSMON_IDR_MSMON_CSU               BIT(16)
-#define MPAMF_MSMON_IDR_MSMON_MBWU              BIT(17)
-#define MPAMF_MSMON_IDR_HAS_LOCAL_CAPT_EVNT     BIT(31)
-
-/* MPAMF_CPOR_IDR - MPAM features cache portion partitioning ID register */
-#define MPAMF_CPOR_IDR_CPBM_WD                  GENMASK(15, 0)
-
-/* MPAMF_CCAP_IDR - MPAM features cache capacity partitioning ID register */
-#define MPAMF_CCAP_IDR_CMAX_WD                  GENMASK(5, 0)
-
-/* MPAMF_MBW_IDR - MPAM features memory bandwidth partitioning ID register */
-#define MPAMF_MBW_IDR_BWA_WD            GENMASK(5, 0)
-#define MPAMF_MBW_IDR_HAS_MIN           BIT(10)
-#define MPAMF_MBW_IDR_HAS_MAX           BIT(11)
-#define MPAMF_MBW_IDR_HAS_PBM           BIT(12)
-#define MPAMF_MBW_IDR_HAS_PROP          BIT(13)
-#define MPAMF_MBW_IDR_WINDWR            BIT(14)
-#define MPAMF_MBW_IDR_BWPBM_WD          GENMASK(28, 16)
-
-/* MPAMF_PRI_IDR - MPAM features priority partitioning ID register */
-#define MPAMF_PRI_IDR_HAS_INTPRI        BIT(0)
-#define MPAMF_PRI_IDR_INTPRI_0_IS_LOW   BIT(1)
-#define MPAMF_PRI_IDR_INTPRI_WD         GENMASK(9, 4)
-#define MPAMF_PRI_IDR_HAS_DSPRI         BIT(16)
-#define MPAMF_PRI_IDR_DSPRI_0_IS_LOW    BIT(17)
-#define MPAMF_PRI_IDR_DSPRI_WD          GENMASK(25, 20)
-
-/* MPAMF_CSUMON_IDR - MPAM cache storage usage monitor ID register */
-#define MPAMF_CSUMON_IDR_NUM_MON        GENMASK(15, 0)
-#define MPAMF_CSUMON_IDR_HAS_CAPTURE    BIT(31)
-
-/* MPAMF_MBWUMON_IDR - MPAM memory bandwidth usage monitor ID register */
-#define MPAMF_MBWUMON_IDR_NUM_MON       GENMASK(15, 0)
-#define MPAMF_MBWUMON_IDR_RWBW           BIT(28)
-#define MPAMF_MBWUMON_IDR_LWD           BIT(29)
-#define MPAMF_MBWUMON_IDR_HAS_LONG      BIT(30)
-#define MPAMF_MBWUMON_IDR_HAS_CAPTURE   BIT(31)
-
-/* MPAMF_PARTID_NRW_IDR - MPAM PARTID narrowing ID register */
-#define MPAMF_PARTID_NRW_IDR_INTPARTID_MAX      GENMASK(15, 0)
-
-/* MPAMF_IIDR - MPAM implementation ID register */
-#define MPAMF_IIDR_PRODUCTID    GENMASK(31, 20)
-#define MPAMF_IIDR_PRODUCTID_SHIFT	20
-#define MPAMF_IIDR_VARIANT      GENMASK(19, 16)
-#define MPAMF_IIDR_VARIANT_SHIFT	16
-#define MPAMF_IIDR_REVISON      GENMASK(15, 12)
-#define MPAMF_IIDR_REVISON_SHIFT	12
-#define MPAMF_IIDR_IMPLEMENTER  GENMASK(11, 0)
-#define MPAMF_IIDR_IMPLEMENTER_SHIFT	0
-
-/* MPAMF_AIDR - MPAM architecture ID register */
-#define MPAMF_AIDR_ARCH_MAJOR_REV       GENMASK(7, 4)
-#define MPAMF_AIDR_ARCH_MINOR_REV       GENMASK(3, 0)
-
-/* MPAMCFG_PART_SEL - MPAM partition configuration selection register */
-#define MPAMCFG_PART_SEL_PARTID_SEL     GENMASK(15, 0)
-#define MPAMCFG_PART_SEL_INTERNAL       BIT(16)
-#define MPAMCFG_PART_SEL_RIS            GENMASK(27, 24)
-
-/* MPAMCFG_CMAX - MPAM cache portion bitmap partition configuration register */
-#define MPAMCFG_CMAX_CMAX               GENMASK(15, 0)
-
-/*
- * MPAMCFG_MBW_MIN - MPAM memory minimum bandwidth partitioning configuration
- *                   register
- */
-#define MPAMCFG_MBW_MIN_MIN             GENMASK(15, 0)
-
-/*
- * MPAMCFG_MBW_MAX - MPAM memory maximum bandwidth partitioning configuration
- *                   register
- */
-#define MPAMCFG_MBW_MAX_MAX             GENMASK(15, 0)
-#define MPAMCFG_MBW_MAX_HARDLIM         BIT(31)
-
-/*
- * MPAMCFG_MBW_WINWD - MPAM memory bandwidth partitioning window width
- *                     register
- */
-#define MPAMCFG_MBW_WINWD_US_FRAC       GENMASK(7, 0)
-#define MPAMCFG_MBW_WINWD_US_INT        GENMASK(23, 8)
-
-
-/* MPAMCFG_PRI - MPAM priority partitioning configuration register */
-#define MPAMCFG_PRI_INTPRI              GENMASK(15, 0)
-#define MPAMCFG_PRI_DSPRI               GENMASK(31, 16)
-
-/*
- * MPAMCFG_MBW_PROP - Memory bandwidth proportional stride partitioning
- *                    configuration register
- */
-#define MPAMCFG_MBW_PROP_STRIDEM1       GENMASK(15, 0)
-#define MPAMCFG_MBW_PROP_EN             BIT(31)
-
-/*
- * MPAMCFG_INTPARTID - MPAM internal partition narrowing configuration register
- */
-#define MPAMCFG_INTPARTID_INTPARTID     GENMASK(15, 0)
-#define MPAMCFG_INTPARTID_INTERNAL      BIT(16)
-
-/* MSMON_CFG_MON_SEL - Memory system performance monitor selection register */
-#define MSMON_CFG_MON_SEL_MON_SEL       GENMASK(7, 0)
-#define MSMON_CFG_MON_SEL_RIS           GENMASK(27, 24)
-
-/* MPAMF_ESR - MPAM Error Status Register */
-#define MPAMF_ESR_PARTID_OR_MON GENMASK(15, 0)
-#define MPAMF_ESR_PMG           GENMASK(23, 16)
-#define MPAMF_ESR_ERRCODE       GENMASK(27, 24)
-#define MPAMF_ESR_OVRWR         BIT(31)
-#define MPAMF_ESR_RIS           GENMASK(35, 32)
-
-/* MPAMF_ECR - MPAM Error Control Register */
-#define MPAMF_ECR_INTEN         BIT(0)
-
-/* Error conditions in accessing memory mapped registers */
-#define MPAM_ERRCODE_NONE                       0
-#define MPAM_ERRCODE_PARTID_SEL_RANGE           1
-#define MPAM_ERRCODE_REQ_PARTID_RANGE           2
-#define MPAM_ERRCODE_MSMONCFG_ID_RANGE          3
-#define MPAM_ERRCODE_REQ_PMG_RANGE              4
-#define MPAM_ERRCODE_MONITOR_RANGE              5
-#define MPAM_ERRCODE_INTPARTID_RANGE            6
-#define MPAM_ERRCODE_UNEXPECTED_INTERNAL        7
-
-/*
- * MSMON_CFG_CSU_FLT - Memory system performance monitor configure cache storage
- *                    usage monitor filter register
- */
-#define MSMON_CFG_CSU_FLT_PARTID       GENMASK(15, 0)
-#define MSMON_CFG_CSU_FLT_PMG          GENMASK(23, 16)
-
-/*
- * MSMON_CFG_CSU_CTL - Memory system performance monitor configure cache storage
- *                    usage monitor control register
- * MSMON_CFG_MBWU_CTL - Memory system performance monitor configure memory
- *                     bandwidth usage monitor control register
- */
-#define MSMON_CFG_x_CTL_TYPE           GENMASK(7, 0)
-#define MSMON_CFG_x_CTL_MATCH_PARTID   BIT(16)
-#define MSMON_CFG_x_CTL_MATCH_PMG      BIT(17)
-#define MSMON_CFG_x_CTL_SCLEN          BIT(19)
-#define MSMON_CFG_x_CTL_SUBTYPE        GENMASK(23, 20)
-#define MSMON_CFG_x_CTL_OFLOW_FRZ      BIT(24)
-#define MSMON_CFG_x_CTL_OFLOW_INTR     BIT(25)
-#define MSMON_CFG_x_CTL_OFLOW_STATUS   BIT(26)
-#define MSMON_CFG_x_CTL_CAPT_RESET     BIT(27)
-#define MSMON_CFG_x_CTL_CAPT_EVNT      GENMASK(30, 28)
-#define MSMON_CFG_x_CTL_EN             BIT(31)
-
-#define MSMON_CFG_MBWU_CTL_TYPE_MBWU			0x42
-#define MSMON_CFG_MBWU_CTL_TYPE_CSU			0x43
-
-#define MSMON_CFG_MBWU_CTL_SUBTYPE_NONE                 0
-#define MSMON_CFG_MBWU_CTL_SUBTYPE_READ                 1
-#define MSMON_CFG_MBWU_CTL_SUBTYPE_WRITE                2
-#define MSMON_CFG_MBWU_CTL_SUBTYPE_BOTH                 3
-
-#define MSMON_CFG_MBWU_CTL_SUBTYPE_MAX                  3
-#define MSMON_CFG_MBWU_CTL_SUBTYPE_MASK                 0x3
-
-/*
- * MSMON_CFG_MBWU_FLT - Memory system performance monitor configure memory
- *                     bandwidth usage monitor filter register
- */
-#define MSMON_CFG_MBWU_FLT_PARTID               GENMASK(15, 0)
-#define MSMON_CFG_MBWU_FLT_PMG                  GENMASK(23, 16)
-#define MSMON_CFG_MBWU_FLT_RWBW                 GENMASK(31, 30)
-
-/*
- * MSMON_CSU - Memory system performance monitor cache storage usage monitor
- *            register
- * MSMON_CSU_CAPTURE -  Memory system performance monitor cache storage usage
- *                     capture register
- * MSMON_MBWU  - Memory system performance monitor memory bandwidth usage
- *               monitor register
- * MSMON_MBWU_CAPTURE - Memory system performance monitor memory bandwidth usage
- *                     capture register
- */
-#define MSMON___VALUE          GENMASK(30, 0)
-#define MSMON___NRDY           BIT(31)
-#define MSMON_MBWU_L_VALUE     GENMASK(62, 0)
-/*
- * MSMON_CAPT_EVNT - Memory system performance monitoring capture event
- *                  generation register
- */
-#define MSMON_CAPT_EVNT_NOW    BIT(0)
-
 #endif /* MPAM_INTERNAL_H */
-- 
Gitee


From ab8bceb8c4eeb60cb5f1e35cf4f7944e1dcb5c1b Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:24 -0800
Subject: [PATCH 108/280] anolis: Revert "arm_mpam: Add the class and component
 structures for ris firmware described"

ANBZ: #31045

This reverts commit af7ac72a6c4d83e798f275b6b68eca8ce0de536b.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/platform/mpam/mpam_devices.c  | 362 +-------------------------
 drivers/platform/mpam/mpam_internal.h |  52 ----
 include/linux/arm_mpam.h              |   7 +-
 3 files changed, 9 insertions(+), 412 deletions(-)

diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
index 599bd4ee5b00..885f8b61cb65 100644
--- a/drivers/platform/mpam/mpam_devices.c
+++ b/drivers/platform/mpam/mpam_devices.c
@@ -20,6 +20,7 @@
 #include <linux/printk.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
+#include <linux/srcu.h>
 #include <linux/types.h>
 
 #include <acpi/pcc.h>
@@ -36,359 +37,11 @@
 static DEFINE_MUTEX(mpam_list_lock);
 static LIST_HEAD(mpam_all_msc);
 
-struct srcu_struct mpam_srcu;
+static struct srcu_struct mpam_srcu;
 
 /* MPAM isn't available until all the MSC have been probed. */
 static u32 mpam_num_msc;
 
-/*
- * An MSC is a container for resources, each identified by their RIS index.
- * Components are a group of RIS that control the same thing.
- * Classes are the set components of the same type.
- *
- * e.g. The set of RIS that make up the L2 are a component. These are sometimes
- * termed slices. They should be configured as if they were one MSC.
- *
- * e.g. The SoC probably has more than one L2, each attached to a distinct set
- * of CPUs. All the L2 components are grouped as a class.
- *
- * When creating an MSC, struct mpam_msc is added to the all mpam_all_msc list,
- * then linked via struct mpam_ris to a component and a class.
- * The same MSC may exist under different class->component paths, but the RIS
- * index will be unique.
- */
-LIST_HEAD(mpam_classes);
-
-static struct mpam_component *
-mpam_component_alloc(struct mpam_class *class, int id, gfp_t gfp)
-{
-	struct mpam_component *comp;
-
-	lockdep_assert_held(&mpam_list_lock);
-
-	comp = kzalloc(sizeof(*comp), gfp);
-	if (!comp)
-		return ERR_PTR(-ENOMEM);
-
-	comp->comp_id = id;
-	INIT_LIST_HEAD_RCU(&comp->ris);
-	/* affinity is updated when ris are added */
-	INIT_LIST_HEAD_RCU(&comp->class_list);
-	comp->class = class;
-
-	list_add_rcu(&comp->class_list, &class->components);
-
-	return comp;
-}
-
-static struct mpam_component *
-mpam_component_get(struct mpam_class *class, int id, bool alloc, gfp_t gfp)
-{
-	struct mpam_component *comp;
-
-	lockdep_assert_held(&mpam_list_lock);
-
-	list_for_each_entry(comp, &class->components, class_list) {
-		if (comp->comp_id == id)
-			return comp;
-	}
-
-	if (!alloc)
-		return ERR_PTR(-ENOENT);
-
-	return mpam_component_alloc(class, id, gfp);
-}
-
-static struct mpam_class *
-mpam_class_alloc(u8 level_idx, enum mpam_class_types type, gfp_t gfp)
-{
-	struct mpam_class *class;
-
-	lockdep_assert_held(&mpam_list_lock);
-
-	class = kzalloc(sizeof(*class), gfp);
-	if (!class)
-		return ERR_PTR(-ENOMEM);
-
-	INIT_LIST_HEAD_RCU(&class->components);
-	/* affinity is updated when ris are added */
-	class->level = level_idx;
-	class->type = type;
-	INIT_LIST_HEAD_RCU(&class->classes_list);
-
-	list_add_rcu(&class->classes_list, &mpam_classes);
-
-	return class;
-}
-
-static struct mpam_class *
-mpam_class_get(u8 level_idx, enum mpam_class_types type, bool alloc, gfp_t gfp)
-{
-	bool found = false;
-	struct mpam_class *class;
-
-	lockdep_assert_held(&mpam_list_lock);
-
-	list_for_each_entry(class, &mpam_classes, classes_list) {
-		if (class->type == type && class->level == level_idx) {
-			found = true;
-			break;
-		}
-	}
-
-	if (found)
-		return class;
-
-	if (!alloc)
-		return ERR_PTR(-ENOENT);
-
-	return mpam_class_alloc(level_idx, type, gfp);
-}
-
-static void mpam_class_destroy(struct mpam_class *class)
-{
-	lockdep_assert_held(&mpam_list_lock);
-
-	list_del_rcu(&class->classes_list);
-	synchronize_srcu(&mpam_srcu);
-	kfree(class);
-}
-
-static void mpam_comp_destroy(struct mpam_component *comp)
-{
-	struct mpam_class *class = comp->class;
-
-	lockdep_assert_held(&mpam_list_lock);
-
-	list_del_rcu(&comp->class_list);
-	synchronize_srcu(&mpam_srcu);
-	kfree(comp);
-
-	if (list_empty(&class->components))
-		mpam_class_destroy(class);
-}
-
-/* synchronise_srcu() before freeing ris */
-static void mpam_ris_destroy(struct mpam_msc_ris *ris)
-{
-	struct mpam_component *comp = ris->comp;
-	struct mpam_class *class = comp->class;
-	struct mpam_msc *msc = ris->msc;
-
-	lockdep_assert_held(&mpam_list_lock);
-	lockdep_assert_preemption_enabled();
-
-	clear_bit(ris->ris_idx, msc->ris_idxs);
-	list_del_rcu(&ris->comp_list);
-	list_del_rcu(&ris->msc_list);
-
-	cpumask_andnot(&comp->affinity, &comp->affinity, &ris->affinity);
-	cpumask_andnot(&class->affinity, &class->affinity, &ris->affinity);
-
-	if (list_empty(&comp->ris))
-		mpam_comp_destroy(comp);
-}
-
-/*
- * There are two ways of reaching a struct mpam_msc_ris. Via the
- * class->component->ris, or via the msc.
- * When destroying the msc, the other side needs unlinking and cleaning up too.
- * synchronise_srcu() before freeing msc.
- */
-static void mpam_msc_destroy(struct mpam_msc *msc)
-{
-	struct mpam_msc_ris *ris, *tmp;
-
-	lockdep_assert_held(&mpam_list_lock);
-	lockdep_assert_preemption_enabled();
-
-	list_for_each_entry_safe(ris, tmp, &msc->ris, msc_list)
-		mpam_ris_destroy(ris);
-}
-
-/*
- * The cacheinfo structures are only populated when CPUs are online.
- * This helper walks the device tree to include offline CPUs too.
- */
-static int get_cpumask_from_cache_id(u32 cache_id, u32 cache_level,
-				     cpumask_t *affinity)
-{
-	int cpu, err;
-	u32 iter_level;
-	int iter_cache_id;
-	struct device_node *iter;
-
-	if (!acpi_disabled)
-		return acpi_pptt_get_cpumask_from_cache_id(cache_id, affinity);
-
-	for_each_possible_cpu(cpu) {
-		iter = of_get_cpu_node(cpu, NULL);
-		if (!iter) {
-			pr_err("Failed to find cpu%d device node\n", cpu);
-			return -ENOENT;
-		}
-
-		while ((iter = of_find_next_cache_node(iter))) {
-			err = of_property_read_u32(iter, "cache-level",
-						   &iter_level);
-			if (err || (iter_level != cache_level)) {
-				of_node_put(iter);
-				continue;
-			}
-
-			/*
-			 * get_cpu_cacheinfo_id() isn't ready until sometime
-			 * during device_initcall(). Use cache_of_get_id().
-			 */
-			iter_cache_id = cache_of_get_id(iter);
-			if (cache_id == ~0UL) {
-				of_node_put(iter);
-				continue;
-			}
-
-			if (iter_cache_id == cache_id)
-				cpumask_set_cpu(cpu, affinity);
-
-			of_node_put(iter);
-		}
-	}
-
-	return 0;
-}
-
-
-/*
- * cpumask_of_node() only knows about online CPUs. This can't tell us whether
- * a class is represented on all possible CPUs.
- */
-static void get_cpumask_from_node_id(u32 node_id, cpumask_t *affinity)
-{
-	int cpu;
-
-	for_each_possible_cpu(cpu) {
-		if (node_id == cpu_to_node(cpu))
-			cpumask_set_cpu(cpu, affinity);
-	}
-}
-
-static int get_cpumask_from_cache(struct device_node *cache,
-				  cpumask_t *affinity)
-{
-	int err;
-	u32 cache_level;
-	int cache_id;
-
-	err = of_property_read_u32(cache, "cache-level", &cache_level);
-	if (err) {
-		pr_err("Failed to read cache-level from cache node\n");
-		return -ENOENT;
-	}
-
-	cache_id = cache_of_get_id(cache);
-	if (cache_id == ~0UL) {
-		pr_err("Failed to calculate cache-id from cache node\n");
-		return -ENOENT;
-	}
-
-	return get_cpumask_from_cache_id(cache_id, cache_level, affinity);
-}
-
-static int mpam_ris_get_affinity(struct mpam_msc *msc, cpumask_t *affinity,
-				 enum mpam_class_types type,
-				 struct mpam_class *class,
-				 struct mpam_component *comp)
-{
-	int err;
-
-	switch (type) {
-	case MPAM_CLASS_CACHE:
-		err = get_cpumask_from_cache_id(comp->comp_id, class->level,
-						affinity);
-		if (err)
-			return err;
-
-		if (cpumask_empty(affinity))
-			pr_warn_once("%s no CPUs associated with cache node",
-				     dev_name(&msc->pdev->dev));
-
-		break;
-	case MPAM_CLASS_MEMORY:
-		get_cpumask_from_node_id(comp->comp_id, affinity);
-		if (cpumask_empty(affinity))
-			pr_warn_once("%s no CPUs associated with memory node",
-				     dev_name(&msc->pdev->dev));
-		break;
-	case MPAM_CLASS_UNKNOWN:
-		return 0;
-	}
-
-	cpumask_and(affinity, affinity, &msc->accessibility);
-
-	return 0;
-}
-
-static int mpam_ris_create_locked(struct mpam_msc *msc, u8 ris_idx,
-				  enum mpam_class_types type, u8 class_id,
-				  int component_id, gfp_t gfp)
-{
-	int err;
-	struct mpam_msc_ris *ris;
-	struct mpam_class *class;
-	struct mpam_component *comp;
-
-	lockdep_assert_held(&mpam_list_lock);
-
-	if (test_and_set_bit(ris_idx, msc->ris_idxs))
-		return -EBUSY;
-
-	ris = devm_kzalloc(&msc->pdev->dev, sizeof(*ris), gfp);
-	if (!ris)
-		return -ENOMEM;
-
-	class = mpam_class_get(class_id, type, true, gfp);
-	if (IS_ERR(class))
-		return PTR_ERR(class);
-
-	comp = mpam_component_get(class, component_id, true, gfp);
-	if (IS_ERR(comp)) {
-		if (list_empty(&class->components))
-			mpam_class_destroy(class);
-		return PTR_ERR(comp);
-	}
-
-	err = mpam_ris_get_affinity(msc, &ris->affinity, type, class, comp);
-	if (err) {
-		if (list_empty(&class->components))
-			mpam_class_destroy(class);
-		return err;
-	}
-
-	ris->ris_idx = ris_idx;
-	INIT_LIST_HEAD_RCU(&ris->comp_list);
-	INIT_LIST_HEAD_RCU(&ris->msc_list);
-	ris->msc = msc;
-	ris->comp = comp;
-
-	cpumask_or(&comp->affinity, &comp->affinity, &ris->affinity);
-	cpumask_or(&class->affinity, &class->affinity, &ris->affinity);
-	list_add_rcu(&ris->comp_list, &comp->ris);
-
-	return 0;
-}
-
-int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
-		    enum mpam_class_types type, u8 class_id, int component_id)
-{
-	int err;
-
-	mutex_lock(&mpam_list_lock);
-	err = mpam_ris_create_locked(msc, ris_idx, type, class_id,
-				     component_id, GFP_KERNEL);
-	mutex_unlock(&mpam_list_lock);
-
-	return err;
-}
-
 static void mpam_discovery_complete(void)
 {
 	pr_err("Discovered all MSC\n");
@@ -500,14 +153,8 @@ static int get_msc_affinity(struct mpam_msc *msc)
 		cpumask_copy(&msc->accessibility, cpu_possible_mask);
 		err = 0;
 	} else {
-		if (of_device_is_compatible(parent, "cache")) {
-			err = get_cpumask_from_cache(parent,
-						     &msc->accessibility);
-		} else {
-			err = -EINVAL;
-			pr_err("Cannot determine accessibility of MSC: %s\n",
-			       dev_name(&msc->pdev->dev));
-		}
+		err = -EINVAL;
+		pr_err("Cannot determine CPU accessibility of MSC\n");
 	}
 	of_node_put(parent);
 
@@ -644,7 +291,6 @@ static int mpam_msc_drv_remove(struct platform_device *pdev)
 	mpam_num_msc--;
 	platform_set_drvdata(pdev, NULL);
 	list_del_rcu(&msc->glbl_list);
-	mpam_msc_destroy(msc);
 	synchronize_srcu(&mpam_srcu);
 	mutex_unlock(&mpam_list_lock);
 
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
index 07d9c70bf1e6..affd7999fcad 100644
--- a/drivers/platform/mpam/mpam_internal.h
+++ b/drivers/platform/mpam/mpam_internal.h
@@ -11,7 +11,6 @@
 #include <linux/mutex.h>
 #include <linux/resctrl.h>
 #include <linux/sizes.h>
-#include <linux/srcu.h>
 
 struct mpam_msc
 {
@@ -46,55 +45,4 @@ struct mpam_msc
 	size_t			mapped_hwpage_sz;
 };
 
-struct mpam_class
-{
-	/* mpam_components in this class */
-	struct list_head	components;
-
-	cpumask_t		affinity;
-
-	u8			level;
-	enum mpam_class_types	type;
-
-	/* member of mpam_classes */
-	struct list_head	classes_list;
-};
-
-struct mpam_component
-{
-	u32			comp_id;
-
-	/* mpam_msc_ris in this component */
-	struct list_head	ris;
-
-	cpumask_t		affinity;
-
-	/* member of mpam_class:components */
-	struct list_head	class_list;
-
-	/* parent: */
-	struct mpam_class	*class;
-};
-
-struct mpam_msc_ris
-{
-	u8			ris_idx;
-
-	cpumask_t		affinity;
-
-	/* member of mpam_component:ris */
-	struct list_head	comp_list;
-
-	/* member of mpam_msc:ris */
-	struct list_head	msc_list;
-
-	/* parents: */
-	struct mpam_msc		*msc;
-	struct mpam_component	*comp;
-};
-
-/* List of all classes */
-extern struct list_head mpam_classes;
-extern struct srcu_struct mpam_srcu;
-
 #endif /* MPAM_INTERNAL_H */
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
index 950ea7049d53..0f1d3f07e789 100644
--- a/include/linux/arm_mpam.h
+++ b/include/linux/arm_mpam.h
@@ -34,7 +34,10 @@ static inline int acpi_mpam_parse_resources(struct mpam_msc *msc,
 static inline int acpi_mpam_count_msc(void) { return -EINVAL; }
 #endif
 
-int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
-		    enum mpam_class_types type, u8 class_id, int component_id);
+static inline int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
+		    enum mpam_class_types type, u8 class_id, int component_id)
+{
+	return -EINVAL;
+}
 
 #endif /* __LINUX_ARM_MPAM_H */
-- 
Gitee


From fa883adcb1422305bc927803b07d89da7732731e Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:25 -0800
Subject: [PATCH 109/280] anolis: Revert "arm_mpam: Add probe/remove for mpam
 msc driver and kbuild boiler plate"

ANBZ: #31045

This reverts commit 04166a32de9bb542594ea4a2f6e332ff7102c95d.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/arm64/Kconfig                    |   1 -
 drivers/platform/Kconfig              |   2 -
 drivers/platform/Makefile             |   1 -
 drivers/platform/mpam/Kconfig         |   6 -
 drivers/platform/mpam/Makefile        |   1 -
 drivers/platform/mpam/mpam_devices.c  | 355 --------------------------
 drivers/platform/mpam/mpam_internal.h |  48 ----
 7 files changed, 414 deletions(-)
 delete mode 100644 drivers/platform/mpam/Kconfig
 delete mode 100644 drivers/platform/mpam/Makefile
 delete mode 100644 drivers/platform/mpam/mpam_devices.c
 delete mode 100644 drivers/platform/mpam/mpam_internal.h

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 659e1ac54f4c..1cbb49ffb961 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -2069,7 +2069,6 @@ config ARM64_TLB_RANGE
 config ARM64_MPAM
 	bool "Enable support for MPAM"
 	select ACPI_MPAM if ACPI
-	select ARM_CPU_RESCTRL
 	help
 	  Memory Partitioning and Monitoring is an optional extension
 	  that allows the CPUs to mark load and store transactions with
diff --git a/drivers/platform/Kconfig b/drivers/platform/Kconfig
index f26534a4a83b..868b20361769 100644
--- a/drivers/platform/Kconfig
+++ b/drivers/platform/Kconfig
@@ -9,8 +9,6 @@ source "drivers/platform/chrome/Kconfig"
 
 source "drivers/platform/mellanox/Kconfig"
 
-source "drivers/platform/mpam/Kconfig"
-
 source "drivers/platform/olpc/Kconfig"
 
 source "drivers/platform/surface/Kconfig"
diff --git a/drivers/platform/Makefile b/drivers/platform/Makefile
index 54ee16e4e4d8..8296d4c41eb7 100644
--- a/drivers/platform/Makefile
+++ b/drivers/platform/Makefile
@@ -12,4 +12,3 @@ obj-$(CONFIG_OLPC_EC)		+= olpc/
 obj-$(CONFIG_GOLDFISH)		+= goldfish/
 obj-$(CONFIG_CHROME_PLATFORMS)	+= chrome/
 obj-$(CONFIG_SURFACE_PLATFORMS)	+= surface/
-obj-$(CONFIG_ARM_CPU_RESCTRL)	+= mpam/
diff --git a/drivers/platform/mpam/Kconfig b/drivers/platform/mpam/Kconfig
deleted file mode 100644
index 13bd86fc5e58..000000000000
--- a/drivers/platform/mpam/Kconfig
+++ /dev/null
@@ -1,6 +0,0 @@
-# Confusingly, this is everything but the CPU bits of MPAM. CPU here means
-# CPU resources, not containers or cgroups etc.
-config ARM_CPU_RESCTRL
-	bool
-	depends on ARM64
-	select RESCTRL_RMID_DEPENDS_ON_CLOSID
diff --git a/drivers/platform/mpam/Makefile b/drivers/platform/mpam/Makefile
deleted file mode 100644
index 8ad69bfa2aa2..000000000000
--- a/drivers/platform/mpam/Makefile
+++ /dev/null
@@ -1 +0,0 @@
-obj-$(CONFIG_ARM_CPU_RESCTRL) += mpam_devices.o
diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c
deleted file mode 100644
index 885f8b61cb65..000000000000
--- a/drivers/platform/mpam/mpam_devices.c
+++ /dev/null
@@ -1,355 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2022 Arm Ltd.
-
-#define pr_fmt(fmt) "mpam: " fmt
-
-#include <linux/acpi.h>
-#include <linux/arm_mpam.h>
-#include <linux/cacheinfo.h>
-#include <linux/cpu.h>
-#include <linux/cpumask.h>
-#include <linux/device.h>
-#include <linux/errno.h>
-#include <linux/gfp.h>
-#include <linux/list.h>
-#include <linux/lockdep.h>
-#include <linux/mutex.h>
-#include <linux/of.h>
-#include <linux/of_platform.h>
-#include <linux/platform_device.h>
-#include <linux/printk.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/srcu.h>
-#include <linux/types.h>
-
-#include <acpi/pcc.h>
-
-#include <asm/mpam.h>
-
-#include "mpam_internal.h"
-
-/*
- * mpam_list_lock protects the SRCU lists when writing. Once the
- * mpam_enabled key is enabled these lists are read-only,
- * unless the error interrupt disables the driver.
- */
-static DEFINE_MUTEX(mpam_list_lock);
-static LIST_HEAD(mpam_all_msc);
-
-static struct srcu_struct mpam_srcu;
-
-/* MPAM isn't available until all the MSC have been probed. */
-static u32 mpam_num_msc;
-
-static void mpam_discovery_complete(void)
-{
-	pr_err("Discovered all MSC\n");
-}
-
-static int mpam_dt_count_msc(void)
-{
-	int count = 0;
-	struct device_node *np;
-
-	for_each_compatible_node(np, NULL, "arm,mpam-msc")
-		count++;
-
-	return count;
-}
-
-static int mpam_dt_parse_resource(struct mpam_msc *msc, struct device_node *np,
-				  u32 ris_idx)
-{
-	int err = 0;
-	u32 level = 0;
-	unsigned long cache_id;
-	struct device_node *cache;
-
-	do {
-		if (of_device_is_compatible(np, "arm,mpam-cache")) {
-			cache = of_parse_phandle(np, "arm,mpam-device", 0);
-			if (!cache) {
-				pr_err("Failed to read phandle\n");
-				break;
-			}
-		} else if (of_device_is_compatible(np->parent, "cache")) {
-			cache = np->parent;
-		} else {
-			/* For now, only caches are supported */
-			cache = NULL;
-			break;
-		}
-
-		err = of_property_read_u32(cache, "cache-level", &level);
-		if (err) {
-			pr_err("Failed to read cache-level\n");
-			break;
-		}
-
-		cache_id = cache_of_get_id(cache);
-		if (cache_id == ~0UL) {
-			err = -ENOENT;
-			break;
-		}
-
-		err = mpam_ris_create(msc, ris_idx, MPAM_CLASS_CACHE, level,
-				      cache_id);
-	} while (0);
-	of_node_put(cache);
-
-	return err;
-}
-
-
-static int mpam_dt_parse_resources(struct mpam_msc *msc, void *ignored)
-{
-	int err, num_ris = 0;
-	const u32 *ris_idx_p;
-	struct device_node *iter, *np;
-
-	np = msc->pdev->dev.of_node;
-	for_each_child_of_node(np, iter) {
-		ris_idx_p = of_get_property(iter, "reg", NULL);
-		if (ris_idx_p) {
-			num_ris++;
-			err = mpam_dt_parse_resource(msc, iter, *ris_idx_p);
-			if (err) {
-				of_node_put(iter);
-				return err;
-			}
-		}
-	}
-
-	if (!num_ris)
-		mpam_dt_parse_resource(msc, np, 0);
-
-	return err;
-}
-
-static int get_msc_affinity(struct mpam_msc *msc)
-{
-	struct device_node *parent;
-	u32 affinity_id;
-	int err;
-
-	if (!acpi_disabled) {
-		err = device_property_read_u32(&msc->pdev->dev, "cpu_affinity",
-					       &affinity_id);
-		if (err) {
-			cpumask_copy(&msc->accessibility, cpu_possible_mask);
-			err = 0;
-		} else {
-			err = acpi_pptt_get_cpus_from_container(affinity_id,
-								&msc->accessibility);
-		}
-
-		return err;
-	}
-
-	/* This depends on the path to of_node */
-	parent = of_get_parent(msc->pdev->dev.of_node);
-	if (parent == of_root) {
-		cpumask_copy(&msc->accessibility, cpu_possible_mask);
-		err = 0;
-	} else {
-		err = -EINVAL;
-		pr_err("Cannot determine CPU accessibility of MSC\n");
-	}
-	of_node_put(parent);
-
-	return err;
-}
-
-static int fw_num_msc;
-
-static void mpam_pcc_rx_callback(struct mbox_client *cl, void *msg)
-{
-	/* TODO: wake up tasks blocked on this MSC's PCC channel */
-}
-
-static int mpam_msc_drv_probe(struct platform_device *pdev)
-{
-	int err;
-	pgprot_t prot;
-	void * __iomem io;
-	struct mpam_msc *msc;
-	struct resource *msc_res;
-	void *plat_data = pdev->dev.platform_data;
-
-	mutex_lock(&mpam_list_lock);
-	do {
-		msc = devm_kzalloc(&pdev->dev, sizeof(*msc), GFP_KERNEL);
-		if (!msc) {
-			err = -ENOMEM;
-			break;
-		}
-
-		INIT_LIST_HEAD_RCU(&msc->glbl_list);
-		msc->pdev = pdev;
-
-		err = device_property_read_u32(&pdev->dev, "arm,not-ready-us",
-					       &msc->nrdy_usec);
-		if (err) {
-			/* This will prevent CSU monitors being usable */
-			msc->nrdy_usec = 0;
-		}
-
-		err = get_msc_affinity(msc);
-		if (err)
-			break;
-		if (cpumask_empty(&msc->accessibility)) {
-			pr_err_once("msc:%u is not accessible from any CPU!",
-				    msc->id);
-			err = -EINVAL;
-			break;
-		}
-
-		mutex_init(&msc->lock);
-		msc->id = mpam_num_msc++;
-		INIT_LIST_HEAD_RCU(&msc->ris);
-		spin_lock_init(&msc->part_sel_lock);
-		spin_lock_init(&msc->mon_sel_lock);
-
-		if (device_property_read_u32(&pdev->dev, "pcc-channel",
-					     &msc->pcc_subspace_id))
-			msc->iface = MPAM_IFACE_MMIO;
-		else
-			msc->iface = MPAM_IFACE_PCC;
-
-		if (msc->iface == MPAM_IFACE_MMIO) {
-			io = devm_platform_get_and_ioremap_resource(pdev, 0,
-								    &msc_res);
-			if (IS_ERR(io)) {
-				pr_err("Failed to map MSC base address\n");
-				devm_kfree(&pdev->dev, msc);
-				err = PTR_ERR(io);
-				break;
-			}
-			msc->mapped_hwpage_sz = msc_res->end - msc_res->start;
-			msc->mapped_hwpage = io;
-		} else if (msc->iface == MPAM_IFACE_PCC) {
-			msc->pcc_cl.dev = &pdev->dev;
-			msc->pcc_cl.rx_callback = mpam_pcc_rx_callback;
-			msc->pcc_cl.tx_block = false;
-			msc->pcc_cl.tx_tout = 1000; /* 1s */
-			msc->pcc_cl.knows_txdone = false;
-
-			msc->pcc_chan = pcc_mbox_request_channel(&msc->pcc_cl,
-								 msc->pcc_subspace_id);
-			if (IS_ERR(msc->pcc_chan)) {
-				pr_err("Failed to request MSC PCC channel\n");
-				devm_kfree(&pdev->dev, msc);
-				err = PTR_ERR(msc->pcc_chan);
-				break;
-			}
-
-			prot = __acpi_get_mem_attribute(msc->pcc_chan->shmem_base_addr);
-			io = ioremap_prot(msc->pcc_chan->shmem_base_addr,
-					  msc->pcc_chan->shmem_size, pgprot_val(prot));
-			if (IS_ERR(io)) {
-				pr_err("Failed to map MSC base address\n");
-				pcc_mbox_free_channel(msc->pcc_chan);
-				devm_kfree(&pdev->dev, msc);
-				err = PTR_ERR(io);
-				break;
-			}
-
-			/* TODO: issue a read to update the registers */
-
-			msc->mapped_hwpage_sz = msc->pcc_chan->shmem_size;
-			msc->mapped_hwpage = io + sizeof(struct acpi_pcct_shared_memory);
-		}
-
-		list_add_rcu(&msc->glbl_list, &mpam_all_msc);
-		platform_set_drvdata(pdev, msc);
-	} while (0);
-	mutex_unlock(&mpam_list_lock);
-
-	if (!err) {
-		/* Create RIS entries described by firmware */
-		if (!acpi_disabled)
-			err = acpi_mpam_parse_resources(msc, plat_data);
-		else
-			err = mpam_dt_parse_resources(msc, plat_data);
-	}
-
-	if (!err && fw_num_msc == mpam_num_msc)
-		mpam_discovery_complete();
-
-	return err;
-}
-
-static int mpam_msc_drv_remove(struct platform_device *pdev)
-{
-	struct mpam_msc *msc = platform_get_drvdata(pdev);
-
-	if (!msc)
-		return 0;
-
-	mutex_lock(&mpam_list_lock);
-	mpam_num_msc--;
-	platform_set_drvdata(pdev, NULL);
-	list_del_rcu(&msc->glbl_list);
-	synchronize_srcu(&mpam_srcu);
-	mutex_unlock(&mpam_list_lock);
-
-	return 0;
-}
-
-static const struct of_device_id mpam_of_match[] = {
-	{ .compatible = "arm,mpam-msc", },
-	{},
-};
-MODULE_DEVICE_TABLE(of, mpam_of_match);
-
-static struct platform_driver mpam_msc_driver = {
-	.driver = {
-		.name = "mpam_msc",
-		.of_match_table = of_match_ptr(mpam_of_match),
-	},
-	.probe = mpam_msc_drv_probe,
-	.remove = mpam_msc_drv_remove,
-};
-
-/*
- * MSC that are hidden under caches are not created as platform devices
- * as there is no cache driver. Caches are also special-cased in
- * get_msc_affinity().
- */
-static void mpam_dt_create_foundling_msc(void)
-{
-	int err;
-	struct device_node *cache;
-
-	for_each_compatible_node(cache, NULL, "cache") {
-		err = of_platform_populate(cache, mpam_of_match, NULL, NULL);
-		if (err) {
-			pr_err("Failed to create MSC devices under caches\n");
-		}
-	}
-}
-
-static int __init mpam_msc_driver_init(void)
-{
-	if (!mpam_cpus_have_feature())
-		return -EOPNOTSUPP;
-
-	init_srcu_struct(&mpam_srcu);
-
-	if (!acpi_disabled)
-		fw_num_msc = acpi_mpam_count_msc();
-	else
-		fw_num_msc = mpam_dt_count_msc();
-
-	if (fw_num_msc <= 0) {
-		pr_err("No MSC devices found in firmware\n");
-		return -EINVAL;
-	}
-
-	if (acpi_disabled)
-		mpam_dt_create_foundling_msc();
-
-	return platform_driver_register(&mpam_msc_driver);
-}
-subsys_initcall(mpam_msc_driver_init);
diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h
deleted file mode 100644
index affd7999fcad..000000000000
--- a/drivers/platform/mpam/mpam_internal.h
+++ /dev/null
@@ -1,48 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2021 Arm Ltd.
-
-#ifndef MPAM_INTERNAL_H
-#define MPAM_INTERNAL_H
-
-#include <linux/arm_mpam.h>
-#include <linux/cpumask.h>
-#include <linux/io.h>
-#include <linux/mailbox_client.h>
-#include <linux/mutex.h>
-#include <linux/resctrl.h>
-#include <linux/sizes.h>
-
-struct mpam_msc
-{
-	/* member of mpam_all_msc */
-	struct list_head        glbl_list;
-
-	int			id;
-	struct platform_device *pdev;
-
-	/* Not modified after mpam_is_enabled() becomes true */
-	enum mpam_msc_iface	iface;
-	u32			pcc_subspace_id;
-	struct mbox_client	pcc_cl;
-	struct pcc_mbox_chan	*pcc_chan;
-	u32			nrdy_usec;
-	cpumask_t		accessibility;
-
-	struct mutex		lock;
-	unsigned long		ris_idxs[128 / BITS_PER_LONG];
-	u32			ris_max;
-
-	/* mpam_msc_ris of this component */
-	struct list_head	ris;
-
-	/*
-	 * part_sel_lock protects access to the MSC hardware registers that are
-	 * affected by MPAMCFG_PART_SEL. (including the ID registers)
-	 * If needed, take msc->lock first.
-	 */
-	spinlock_t		part_sel_lock;
-	void __iomem *		mapped_hwpage;
-	size_t			mapped_hwpage_sz;
-};
-
-#endif /* MPAM_INTERNAL_H */
-- 
Gitee


From 48d6b673d6c6d21d76b4f310c1901938a3be6b79 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:25 -0800
Subject: [PATCH 110/280] anolis: Revert "dt-bindings: arm: Add MPAM MSC
 binding"

ANBZ: #31045

This reverts commit 5f900916c83404c0f882d1e658ccf236f6d401e2.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 .../devicetree/bindings/arm/arm,mpam-msc.yaml | 227 ------------------
 1 file changed, 227 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/arm/arm,mpam-msc.yaml

diff --git a/Documentation/devicetree/bindings/arm/arm,mpam-msc.yaml b/Documentation/devicetree/bindings/arm/arm,mpam-msc.yaml
deleted file mode 100644
index 9d542ecb1a7d..000000000000
--- a/Documentation/devicetree/bindings/arm/arm,mpam-msc.yaml
+++ /dev/null
@@ -1,227 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
-%YAML 1.2
----
-$id: http://devicetree.org/schemas/arm/arm,mpam-msc.yaml#
-$schema: http://devicetree.org/meta-schemas/core.yaml#
-
-title: Arm Memory System Resource Partitioning and Monitoring (MPAM)
-
-description: |
-  The Arm MPAM specification can be found here:
-
-  https://developer.arm.com/documentation/ddi0598/latest
-
-maintainers:
-  - Rob Herring <robh@kernel.org>
-
-properties:
-  compatible:
-    items:
-      - const: arm,mpam-msc                   # Further details are discoverable
-      - const: arm,mpam-memory-controller-msc
-
-  reg:
-    maxItems: 1
-    description: A memory region containing registers as defined in the MPAM
-      specification.
-
-  interrupts:
-    minItems: 1
-    items:
-      - description: error (optional)
-      - description: overflow (optional, only for monitoring)
-
-  interrupt-names:
-    oneOf:
-      - items:
-          - enum: [ error, overflow ]
-      - items:
-          - const: error
-          - const: overflow
-
-  arm,not-ready-us:
-    description: The maximum time in microseconds for monitoring data to be
-      accurate after a settings change. For more information, see the
-      Not-Ready (NRDY) bit description in the MPAM specification.
-
-  numa-node-id: true # see NUMA binding
-
-  '#address-cells':
-    const: 1
-
-  '#size-cells':
-    const: 0
-
-patternProperties:
-  '^ris@[0-9a-f]$':
-    type: object
-    additionalProperties: false
-    description: |
-      RIS nodes for each RIS in an MSC. These nodes are required for each RIS
-      implementing known MPAM controls
-
-    properties:
-      compatible:
-        enum:
-            # Bulk storage for cache
-          - arm,mpam-cache
-            # Memory bandwidth
-          - arm,mpam-memory
-
-      reg:
-        minimum: 0
-        maximum: 0xf
-
-      cpus:
-        $ref: '/schemas/types.yaml#/definitions/phandle-array'
-        description:
-          Phandle(s) to the CPU node(s) this RIS belongs to. By default, the parent
-          device's affinity is used.
-
-      arm,mpam-device:
-        $ref: '/schemas/types.yaml#/definitions/phandle'
-        description:
-          By default, the MPAM enabled device associated with a RIS is the MSC's
-          parent node. It is possible for each RIS to be associated with different
-          devices in which case 'arm,mpam-device' should be used.
-
-    required:
-      - compatible
-      - reg
-
-required:
-  - compatible
-  - reg
-
-dependencies:
-  interrupts: [ interrupt-names ]
-
-additionalProperties: false
-
-examples:
-  - |
-    /*
-    cpus {
-        cpu@0 {
-            next-level-cache = <&L2_0>;
-        };
-        cpu@100 {
-            next-level-cache = <&L2_1>;
-        };
-    };
-    */
-    L2_0: cache-controller-0 {
-        compatible = "cache";
-        cache-level = <2>;
-        cache-unified;
-        next-level-cache = <&L3>;
-
-    };
-
-    L2_1: cache-controller-1 {
-        compatible = "cache";
-        cache-level = <2>;
-        cache-unified;
-        next-level-cache = <&L3>;
-
-    };
-
-    L3: cache-controller@30000000 {
-        compatible = "arm,dsu-l3-cache", "cache";
-        cache-level = <3>;
-        cache-unified;
-
-        ranges = <0x0 0x30000000 0x800000>;
-        #address-cells = <1>;
-        #size-cells = <1>;
-
-        msc@10000 {
-            compatible = "arm,mpam-msc";
-
-            /* CPU affinity implied by parent cache node's  */
-            reg = <0x10000 0x2000>;
-            interrupts = <1>, <2>;
-            interrupt-names = "error", "overflow";
-            arm,not-ready-us = <1>;
-        };
-    };
-
-    mem: memory-controller@20000 {
-        compatible = "foo,a-memory-controller";
-        reg = <0x20000 0x1000>;
-
-        #address-cells = <1>;
-        #size-cells = <1>;
-        ranges;
-
-        msc@21000 {
-            compatible = "arm,mpam-memory-controller-msc", "arm,mpam-msc";
-            reg = <0x21000 0x1000>;
-            interrupts = <3>;
-            interrupt-names = "error";
-            arm,not-ready-us = <1>;
-            numa-node-id = <1>;
-        };
-    };
-
-    iommu@40000 {
-        reg = <0x40000 0x1000>;
-
-        ranges;
-        #address-cells = <1>;
-        #size-cells = <1>;
-
-        msc@41000 {
-            compatible = "arm,mpam-msc";
-            reg = <0 0x1000>;
-            interrupts = <5>, <6>;
-            interrupt-names = "error", "overflow";
-            arm,not-ready-us = <1>;
-
-            #address-cells = <1>;
-            #size-cells = <0>;
-
-            ris@2 {
-                compatible = "arm,mpam-cache";
-                reg = <0>;
-                // TODO: How to map to device(s)?
-            };
-        };
-    };
-
-    msc@80000 {
-        compatible = "foo,a-standalone-msc";
-        reg = <0x80000 0x1000>;
-
-        clocks = <&clks 123>;
-
-        ranges;
-        #address-cells = <1>;
-        #size-cells = <1>;
-
-        msc@10000 {
-            compatible = "arm,mpam-msc";
-
-            reg = <0x10000 0x2000>;
-            interrupts = <7>;
-            interrupt-names = "overflow";
-            arm,not-ready-us = <1>;
-
-            #address-cells = <1>;
-            #size-cells = <0>;
-
-            ris@0 {
-                compatible = "arm,mpam-cache";
-                reg = <0>;
-                arm,mpam-device = <&L2_0>;
-            };
-
-            ris@1 {
-                compatible = "arm,mpam-memory";
-                reg = <1>;
-                arm,mpam-device = <&mem>;
-            };
-        };
-    };
-
-...
-- 
Gitee


From 6ead526c5e760fc100788d9b01c9b5aba611071f Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:25 -0800
Subject: [PATCH 111/280] anolis: Revert "ACPI / MPAM: Parse the MPAM table"

ANBZ: #31045

This reverts commit fdae51957a3770b914313379c4bfc7baf44fcfe9.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/arm64/Kconfig          |   1 -
 drivers/acpi/arm64/Kconfig  |   3 -
 drivers/acpi/arm64/Makefile |   1 -
 drivers/acpi/arm64/mpam.c   | 369 ------------------------------------
 drivers/acpi/tables.c       |   2 +-
 include/linux/arm_mpam.h    |  43 -----
 6 files changed, 1 insertion(+), 418 deletions(-)
 delete mode 100644 drivers/acpi/arm64/mpam.c
 delete mode 100644 include/linux/arm_mpam.h

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 1cbb49ffb961..bd77f5ad4169 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -2068,7 +2068,6 @@ config ARM64_TLB_RANGE
 
 config ARM64_MPAM
 	bool "Enable support for MPAM"
-	select ACPI_MPAM if ACPI
 	help
 	  Memory Partitioning and Monitoring is an optional extension
 	  that allows the CPUs to mark load and store transactions with
diff --git a/drivers/acpi/arm64/Kconfig b/drivers/acpi/arm64/Kconfig
index f2fd79f22e7d..b3ed6212244c 100644
--- a/drivers/acpi/arm64/Kconfig
+++ b/drivers/acpi/arm64/Kconfig
@@ -21,6 +21,3 @@ config ACPI_AGDI
 
 config ACPI_APMT
 	bool
-
-config ACPI_MPAM
-	bool
diff --git a/drivers/acpi/arm64/Makefile b/drivers/acpi/arm64/Makefile
index d8bd6066a4c6..726944648c9b 100644
--- a/drivers/acpi/arm64/Makefile
+++ b/drivers/acpi/arm64/Makefile
@@ -4,6 +4,5 @@ obj-$(CONFIG_ACPI_IORT) 	+= iort.o
 obj-$(CONFIG_ACPI_GTDT) 	+= gtdt.o
 obj-$(CONFIG_ACPI_APMT) 	+= apmt.o
 obj-$(CONFIG_ARM_AMBA)		+= amba.o
-obj-$(CONFIG_ACPI_MPAM) 	+= mpam.o
 obj-y				+= dma.o init.o
 obj-y				+= thermal_cpufreq.o
diff --git a/drivers/acpi/arm64/mpam.c b/drivers/acpi/arm64/mpam.c
deleted file mode 100644
index 8a63449f27b5..000000000000
--- a/drivers/acpi/arm64/mpam.c
+++ /dev/null
@@ -1,369 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2022 Arm Ltd.
-
-/* Parse the MPAM ACPI table feeding the discovered nodes into the driver */
-
-#define pr_fmt(fmt) "ACPI MPAM: " fmt
-
-#include <linux/acpi.h>
-#include <linux/arm_mpam.h>
-#include <linux/cpu.h>
-#include <linux/cpumask.h>
-#include <linux/platform_device.h>
-
-#include <acpi/processor.h>
-
-#include <asm/mpam.h>
-
-/* Flags for acpi_table_mpam_msc.*_interrupt_flags */
-#define ACPI_MPAM_MSC_IRQ_MODE_EDGE                    1
-#define ACPI_MPAM_MSC_IRQ_TYPE_MASK                    (3<<1)
-#define ACPI_MPAM_MSC_IRQ_TYPE_WIRED                   0
-#define ACPI_MPAM_MSC_IRQ_AFFINITY_PROCESSOR_CONTAINER (1<<3)
-#define ACPI_MPAM_MSC_IRQ_AFFINITY_VALID               (1<<4)
-
-static bool frob_irq(struct platform_device *pdev, int intid, u32 flags,
-		     int *irq, u32 processor_container_uid)
-{
-	int sense;
-
-	if (!intid)
-		return false;
-
-	/* 0 in this field indicates a wired interrupt */
-	if (flags & ACPI_MPAM_MSC_IRQ_TYPE_MASK)
-		return false;
-
-	if (flags & ACPI_MPAM_MSC_IRQ_MODE_EDGE)
-		sense = ACPI_EDGE_SENSITIVE;
-	else
-		sense = ACPI_LEVEL_SENSITIVE;
-
-	/*
-	 * If the GSI is in the GIC's PPI range, try and create a partitioned
-	 * percpu interrupt.
-	 */
-	if (16 <= intid && intid < 32 && processor_container_uid != ~0) {
-		pr_err_once("Partitioned interrupts not supported\n");
-		return false;
-	} else {
-		*irq = acpi_register_gsi(&pdev->dev, intid, sense,
-					 ACPI_ACTIVE_HIGH);
-	}
-	if (*irq <= 0) {
-		pr_err_once("Failed to register interrupt 0x%x with ACPI\n",
-			    intid);
-		return false;
-	}
-
-	return true;
-}
-
-static void acpi_mpam_parse_irqs(struct platform_device *pdev,
-				 struct acpi_mpam_msc_node *tbl_msc,
-				 struct resource *res, int *res_idx)
-{
-	u32 flags, aff = ~0;
-	int irq;
-
-	flags = tbl_msc->overflow_interrupt_flags;
-	if (flags & ACPI_MPAM_MSC_IRQ_AFFINITY_VALID &&
-	    flags & ACPI_MPAM_MSC_IRQ_AFFINITY_PROCESSOR_CONTAINER)
-		aff = tbl_msc->overflow_interrupt_affinity;
-	if (frob_irq(pdev, tbl_msc->overflow_interrupt, flags, &irq, aff)) {
-		res[*res_idx].start = irq;
-		res[*res_idx].end = irq;
-		res[*res_idx].flags = IORESOURCE_IRQ;
-		res[*res_idx].name = "overflow";
-
-		(*res_idx)++;
-	}
-
-	flags = tbl_msc->error_interrupt_flags;
-	if (flags & ACPI_MPAM_MSC_IRQ_AFFINITY_VALID &&
-	    flags & ACPI_MPAM_MSC_IRQ_AFFINITY_PROCESSOR_CONTAINER)
-		aff = tbl_msc->error_interrupt_affinity;
-	else
-		aff = ~0;
-	if (frob_irq(pdev, tbl_msc->error_interrupt, flags, &irq, aff)) {
-		res[*res_idx].start = irq;
-		res[*res_idx].end = irq;
-		res[*res_idx].flags = IORESOURCE_IRQ;
-		res[*res_idx].name = "error";
-
-		(*res_idx)++;
-	}
-}
-
-static int acpi_mpam_parse_resource(struct mpam_msc *msc,
-				    struct acpi_mpam_resource_node *res)
-{
-	u32 cache_id;
-	int level;
-
-	switch (res->locator_type) {
-	case ACPI_MPAM_LOCATION_TYPE_PROCESSOR_CACHE:
-		cache_id = res->locator.cache_locator.cache_reference;
-		level = find_acpi_cache_level_from_id(cache_id);
-		if (level < 0) {
-			pr_err_once("Bad level for cache with id %u\n", cache_id);
-			return level;
-		}
-		return mpam_ris_create(msc, res->ris_index, MPAM_CLASS_CACHE,
-				       level, cache_id);
-	case ACPI_MPAM_LOCATION_TYPE_MEMORY:
-		return mpam_ris_create(msc, res->ris_index, MPAM_CLASS_MEMORY,
-				       255, res->locator.memory_locator.proximity_domain);
-	default:
-		/* These get discovered later and treated as unknown */
-		return 0;
-	}
-}
-
-int acpi_mpam_parse_resources(struct mpam_msc *msc,
-			      struct acpi_mpam_msc_node *tbl_msc)
-{
-	int i, err;
-	struct acpi_mpam_resource_node *resources;
-
-	resources = (struct acpi_mpam_resource_node *)(tbl_msc + 1);
-	for (i = 0; i < tbl_msc->num_resouce_nodes; i++) {
-		err = acpi_mpam_parse_resource(msc, &resources[i]);
-		if (err)
-			return err;
-	}
-
-	return 0;
-}
-
-static bool __init parse_msc_pm_link(struct acpi_mpam_msc_node *tbl_msc,
-				     struct platform_device *pdev,
-				     u32 *acpi_id)
-{
-	bool acpi_id_valid = false;
-	struct acpi_device *buddy;
-	char hid[16], uid[16];
-	int err;
-
-	memset(&hid, 0, sizeof(hid));
-	memcpy(hid, &tbl_msc->hardware_id_linked_device,
-	       sizeof(tbl_msc->hardware_id_linked_device));
-
-	if (!strcmp(hid, ACPI_PROCESSOR_CONTAINER_HID)) {
-		*acpi_id = tbl_msc->instance_id_linked_device;
-		acpi_id_valid = true;
-	}
-
-	err = snprintf(uid, sizeof(uid), "%u",
-		       tbl_msc->instance_id_linked_device);
-	if (err < 0 || err >= sizeof(uid))
-		return acpi_id_valid;
-
-	buddy = acpi_dev_get_first_match_dev(hid, uid, -1);
-	if (buddy) {
-		device_link_add(&pdev->dev, &buddy->dev, DL_FLAG_STATELESS);
-	}
-
-	return acpi_id_valid;
-}
-
-static int decode_interface_type(struct acpi_mpam_msc_node *tbl_msc,
-				 enum mpam_msc_iface *iface)
-{
-	switch (tbl_msc->interface_type){
-	case 0:
-		*iface = MPAM_IFACE_MMIO;
-		return 0;
-	case 1:
-		*iface = MPAM_IFACE_PCC;
-		return 0;
-	default:
-		return -EINVAL;
-	}
-}
-
-static int __init _parse_table(struct acpi_table_header *table)
-{
-	char *table_end, *table_offset = (char *)(table + 1);
-	struct property_entry props[4]; /* needs a sentinel */
-	struct acpi_mpam_msc_node *tbl_msc;
-	int next_res, next_prop, err = 0;
-	struct acpi_device *companion;
-	struct platform_device *pdev;
-	enum mpam_msc_iface iface;
-	struct resource res[3];
-	char uid[16];
-	u32 acpi_id;
-
-	table_end = (char *)table + table->length;
-
-	while (table_offset < table_end) {
-		tbl_msc = (struct acpi_mpam_msc_node *)table_offset;
-		table_offset += tbl_msc->length;
-
-		/*
-		 * If any of the reserved fields are set, make no attempt to
-		 * parse the msc structure. This will prevent the driver from
-		 * probing all the MSC, meaning it can't discover the system
-		 * wide supported partid and pmg ranges. This avoids whatever
-		 * this MSC is truncating the partids and creating a screaming
-		 * error interrupt.
-		 */
-		if (tbl_msc->reserved || tbl_msc->reserved1 || tbl_msc->reserved2)
-			continue;
-
-		if (decode_interface_type(tbl_msc, &iface))
-			continue;
-
-		next_res = 0;
-		next_prop = 0;
-		memset(res, 0, sizeof(res));
-		memset(props, 0, sizeof(props));
-
-		pdev = platform_device_alloc("mpam_msc", tbl_msc->identifier);
-		if (IS_ERR(pdev)) {
-			err = PTR_ERR(pdev);
-			break;
-		}
-
-		if (tbl_msc->length < sizeof(*tbl_msc)) {
-			err = -EINVAL;
-			break;
-		}
-
-		/* Some power management is described in the namespace: */
-		err = snprintf(uid, sizeof(uid), "%u", tbl_msc->identifier);
-		if (err > 0 && err < sizeof(uid)) {
-			companion = acpi_dev_get_first_match_dev("ARMHAA5C", uid, -1);
-			if (companion)
-				ACPI_COMPANION_SET(&pdev->dev, companion);
-		}
-
-		if (iface == MPAM_IFACE_MMIO) {
-			res[next_res].name = "MPAM:MSC";
-			res[next_res].start = tbl_msc->base_address;
-			res[next_res].end = tbl_msc->base_address + tbl_msc->mmio_size - 1;
-			res[next_res].flags = IORESOURCE_MEM;
-			next_res++;
-		} else if (iface == MPAM_IFACE_PCC) {
-			props[next_prop++] = PROPERTY_ENTRY_U32("pcc-channel",
-								tbl_msc->base_address);
-			next_prop++;
-		}
-
-		acpi_mpam_parse_irqs(pdev, tbl_msc, res, &next_res);
-		err = platform_device_add_resources(pdev, res, next_res);
-		if (err)
-			break;
-
-		props[next_prop++] = PROPERTY_ENTRY_U32("arm,not-ready-us",
-							tbl_msc->max_nrdy_usec);
-
-		/*
-		 * The MSC's CPU affinity is described via its linked power
-		 * management device, but only if it points at a Processor or
-		 * Processor Container.
-		 */
-		if (parse_msc_pm_link(tbl_msc, pdev, &acpi_id)) {
-			props[next_prop++] = PROPERTY_ENTRY_U32("cpu_affinity",
-								acpi_id);
-		}
-
-		err = device_create_managed_software_node(&pdev->dev, props,
-							  NULL);
-		if (err)
-			break;
-
-		/* Come back later if you want the RIS too */
-		err = platform_device_add_data(pdev, tbl_msc, tbl_msc->length);
-		if (err)
-			break;
-
-		platform_device_add(pdev);
-	}
-
-	if (err)
-		platform_device_put(pdev);
-
-	return err;
-}
-
-static struct acpi_table_header *get_table(void)
-{
-	struct acpi_table_header *table;
-	acpi_status status;
-
-	if (acpi_disabled || !mpam_cpus_have_feature())
-		return NULL;
-
-	status = acpi_get_table(ACPI_SIG_MPAM, 0, &table);
-	if (ACPI_FAILURE(status))
-		return NULL;
-
-	if (table->revision != 1)
-		return NULL;
-
-	return table;
-}
-
-
-
-static int __init acpi_mpam_parse(void)
-{
-	struct acpi_table_header *mpam;
-	int err;
-
-	mpam = get_table();
-	if (!mpam)
-		return 0;
-
-	err = _parse_table(mpam);
-	acpi_put_table(mpam);
-
-	return err;
-}
-
-static int _count_msc(struct acpi_table_header *table)
-{
-	char *table_end, *table_offset = (char *)(table + 1);
-	struct acpi_mpam_msc_node *tbl_msc;
-	int ret = 0;
-
-	tbl_msc = (struct acpi_mpam_msc_node *)table_offset;
-	table_end = (char *)table + table->length;
-
-	while (table_offset < table_end) {
-		if (tbl_msc->length < sizeof(*tbl_msc))
-			return -EINVAL;
-
-		ret++;
-
-		table_offset += tbl_msc->length;
-		tbl_msc = (struct acpi_mpam_msc_node *)table_offset;
-	}
-
-	return ret;
-}
-
-
-int acpi_mpam_count_msc(void)
-{
-	struct acpi_table_header *mpam;
-	int ret;
-
-	mpam = get_table();
-	if (!mpam)
-		return 0;
-
-	ret = _count_msc(mpam);
-	acpi_put_table(mpam);
-
-	return ret;
-}
-
-/*
- * Call after ACPI devices have been created, which happens behind acpi_scan_init()
- * called from subsys_initcall(). PCC requires the mailbox driver, which is
- * initialised from postcore_initcall().
- */
-subsys_initcall_sync(acpi_mpam_parse);
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 8961e4101a1d..6b4c292f989d 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -431,7 +431,7 @@ static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = {
 	ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
 	ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
 	ACPI_SIG_NHLT, ACPI_SIG_AEST, ACPI_SIG_CEDT, ACPI_SIG_AGDI,
-	ACPI_SIG_NBFT, ACPI_SIG_MPAM };
+	ACPI_SIG_NBFT };
 
 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 
diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h
deleted file mode 100644
index 0f1d3f07e789..000000000000
--- a/include/linux/arm_mpam.h
+++ /dev/null
@@ -1,43 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2021 Arm Ltd.
-
-#ifndef __LINUX_ARM_MPAM_H
-#define __LINUX_ARM_MPAM_H
-
-#include <linux/acpi.h>
-#include <linux/types.h>
-
-struct mpam_msc;
-
-enum mpam_msc_iface {
-	MPAM_IFACE_MMIO,	/* a real MPAM MSC */
-	MPAM_IFACE_PCC,		/* a fake MPAM MSC */
-};
-
-enum mpam_class_types {
-	MPAM_CLASS_CACHE,       /* Well known caches, e.g. L2 */
-	MPAM_CLASS_MEMORY,      /* Main memory */
-	MPAM_CLASS_UNKNOWN,     /* Everything else, e.g. SMMU */
-};
-
-#ifdef CONFIG_ACPI_MPAM
-/* Parse the ACPI description of resources entries for this MSC. */
-int acpi_mpam_parse_resources(struct mpam_msc *msc,
-			      struct acpi_mpam_msc_node *tbl_msc);
-int acpi_mpam_count_msc(void);
-#else
-static inline int acpi_mpam_parse_resources(struct mpam_msc *msc,
-					    struct acpi_mpam_msc_node *tbl_msc)
-{
-	return -EINVAL;
-}
-static inline int acpi_mpam_count_msc(void) { return -EINVAL; }
-#endif
-
-static inline int mpam_ris_create(struct mpam_msc *msc, u8 ris_idx,
-		    enum mpam_class_types type, u8 class_id, int component_id)
-{
-	return -EINVAL;
-}
-
-#endif /* __LINUX_ARM_MPAM_H */
-- 
Gitee


From 76dedfc8a3f92deab19c615caa4051b591aa7af1 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:25 -0800
Subject: [PATCH 112/280] anolis: Revert "drivers: base: cacheinfo: Add helper
 to find the cache size from cpu+level"

ANBZ: #31045

This reverts commit 52d95c086250fb32b23633274f4767fe8a687c1f.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/cacheinfo.h | 21 ---------------------
 1 file changed, 21 deletions(-)

diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index 251e8b393ec7..2802406bb422 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -133,27 +133,6 @@ static inline unsigned long get_cpu_cacheinfo_id(int cpu, int level)
 	return ~0UL;
 }
 
-/*
- * Get the size of the cache associated with @cpu at level @level.
- * cpuhp lock must be held.
- */
-static inline unsigned int get_cpu_cacheinfo_size(int cpu, int level)
-{
-	struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu);
-	int i;
-
-	if (!ci->info_list)
-		return 0;
-
-	for (i = 0; i < ci->num_leaves; i++) {
-		if (ci->info_list[i].level == level) {
-			return ci->info_list[i].size;
-		}
-	}
-
-	return 0;
-}
-
 #ifdef CONFIG_ARM64
 #define use_arch_cache_info()	(true)
 #else
-- 
Gitee


From 8d2b748cbc88a9410f4f2b588f5b4129de460ff3 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:25 -0800
Subject: [PATCH 113/280] anolis: Revert "cacheinfo: Expose the code to
 generate a cache-id from a device_node"

ANBZ: #31045

This reverts commit c7d8421f932acf34a3d8fa45682a26e62e161f1d.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/base/cacheinfo.c  | 13 +++----------
 include/linux/cacheinfo.h |  1 -
 2 files changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index 24200cb949cc..54f16bb71152 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -183,7 +183,7 @@ static bool cache_node_is_unified(struct cacheinfo *this_leaf,
 	return of_property_read_bool(np, "cache-unified");
 }
 
-unsigned long cache_of_get_id(struct device_node *np)
+static void cache_of_set_id(struct cacheinfo *this_leaf, struct device_node *np)
 {
 	struct device_node *cpu;
 	unsigned long min_id = ~0UL;
@@ -202,15 +202,8 @@ unsigned long cache_of_get_id(struct device_node *np)
 		}
 	}
 
-	return min_id;
-}
-
-static void cache_of_set_id(struct cacheinfo *this_leaf, struct device_node *np)
-{
-	unsigned long id = cache_of_get_id(np);
-
-	if (id != ~0UL) {
-		this_leaf->id = id;
+	if (min_id != ~0UL) {
+		this_leaf->id = min_id;
 		this_leaf->attributes |= CACHE_ID;
 	}
 }
diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index 2802406bb422..e0717a2d7ca0 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -111,7 +111,6 @@ int acpi_get_cache_info(unsigned int cpu,
 #endif
 
 const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf);
-unsigned long cache_of_get_id(struct device_node *np);
 
 /*
  * Get the id of the cache associated with @cpu at level @level.
-- 
Gitee


From 2fd46b4c343699e9a49620a118807aa8f82d43cb Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:25 -0800
Subject: [PATCH 114/280] anolis: Revert "cacheinfo: Set cache 'id' based on DT
 data"

ANBZ: #31045

This reverts commit a0b821ea63c7fa7c65ba7cf2674f91b3747ab964.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/base/cacheinfo.c | 26 --------------------------
 1 file changed, 26 deletions(-)

diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index 54f16bb71152..6ad1ac0723a6 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -183,31 +183,6 @@ static bool cache_node_is_unified(struct cacheinfo *this_leaf,
 	return of_property_read_bool(np, "cache-unified");
 }
 
-static void cache_of_set_id(struct cacheinfo *this_leaf, struct device_node *np)
-{
-	struct device_node *cpu;
-	unsigned long min_id = ~0UL;
-
-	for_each_of_cpu_node(cpu) {
-		struct device_node *cache_node = cpu;
-		u64 id = of_get_cpu_hwid(cache_node, 0);
-
-		while ((cache_node = of_find_next_cache_node(cache_node))) {
-			if ((cache_node == np) && (id < min_id)) {
-				min_id = id;
-				of_node_put(cache_node);
-				break;
-			}
-			of_node_put(cache_node);
-		}
-	}
-
-	if (min_id != ~0UL) {
-		this_leaf->id = min_id;
-		this_leaf->attributes |= CACHE_ID;
-	}
-}
-
 static void cache_of_set_props(struct cacheinfo *this_leaf,
 			       struct device_node *np)
 {
@@ -223,7 +198,6 @@ static void cache_of_set_props(struct cacheinfo *this_leaf,
 	cache_get_line_size(this_leaf, np);
 	cache_nr_sets(this_leaf, np);
 	cache_associativity(this_leaf);
-	cache_of_set_id(this_leaf, np);
 }
 
 static int cache_setup_of_node(unsigned int cpu)
-- 
Gitee


From 9a5d11f66bdd7ada72793e10c526a91b5a667819 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:25 -0800
Subject: [PATCH 115/280] anolis: Revert "cacheinfo: Allow for >32-bit cache
 'id'"

ANBZ: #31045

This reverts commit e95ad3323b7d0cbd7ae7f52541a7ec6733fe4555.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/base/cacheinfo.c  | 8 +-------
 include/linux/cacheinfo.h | 8 ++++----
 2 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index 6ad1ac0723a6..0fbb1575e297 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -622,19 +622,13 @@ static ssize_t file_name##_show(struct device *dev,		\
 	return sysfs_emit(buf, "%u\n", this_leaf->object);	\
 }
 
+show_one(id, id);
 show_one(level, level);
 show_one(coherency_line_size, coherency_line_size);
 show_one(number_of_sets, number_of_sets);
 show_one(physical_line_partition, physical_line_partition);
 show_one(ways_of_associativity, ways_of_associativity);
 
-static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct cacheinfo *this_leaf = dev_get_drvdata(dev);
-
-	return sysfs_emit(buf, "%lu\n", this_leaf->id);
-}
-
 static ssize_t size_show(struct device *dev,
 			 struct device_attribute *attr, char *buf)
 {
diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index e0717a2d7ca0..d504eb4b49ab 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -47,7 +47,7 @@ extern unsigned int coherency_max_size;
  * keeping, the remaining members form the core properties of the cache
  */
 struct cacheinfo {
-	unsigned long id;
+	unsigned int id;
 	enum cache_type type;
 	unsigned int level;
 	unsigned int coherency_line_size;
@@ -116,7 +116,7 @@ const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf);
  * Get the id of the cache associated with @cpu at level @level.
  * cpuhp lock must be held.
  */
-static inline unsigned long get_cpu_cacheinfo_id(int cpu, int level)
+static inline int get_cpu_cacheinfo_id(int cpu, int level)
 {
 	struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu);
 	int i;
@@ -125,11 +125,11 @@ static inline unsigned long get_cpu_cacheinfo_id(int cpu, int level)
 		if (ci->info_list[i].level == level) {
 			if (ci->info_list[i].attributes & CACHE_ID)
 				return ci->info_list[i].id;
-			return ~0UL;
+			return -1;
 		}
 	}
 
-	return ~0UL;
+	return -1;
 }
 
 #ifdef CONFIG_ARM64
-- 
Gitee


From 92abd240b10e98af6abd39bb70d1f9af14e2e806 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:25 -0800
Subject: [PATCH 116/280] anolis: Revert "ACPI / PPTT: Add a helper to fill a
 cpumask from a cache_id"

ANBZ: #31045

This reverts commit 32b40340fc76af7ed3411b00fe338ec7ae4a35be.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/acpi/pptt.c  | 79 ++------------------------------------------
 include/linux/acpi.h |  6 ----
 2 files changed, 2 insertions(+), 83 deletions(-)

diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
index f5dcabdc99c9..19fbda328cd8 100644
--- a/drivers/acpi/pptt.c
+++ b/drivers/acpi/pptt.c
@@ -183,10 +183,9 @@ acpi_find_cache_level(struct acpi_table_header *table_hdr,
  * levels and split cache levels (data/instruction).
  * @table_hdr: Pointer to the head of the PPTT table
  * @cpu_node: processor node we wish to count caches for
- * @levels: Number of levels if success. (*levels) should be initialized by
- *          the caller with the value to be used as the starting level.
+ * @levels: Number of levels if success.
  * @split_levels:	Number of split cache levels (data/instruction) if
- *			success. Can be NULL.
+ *			success. Can by NULL.
  *
  * Given a processor node containing a processing unit, walk into it and count
  * how many levels exist solely for it, and then walk up each level until we hit
@@ -988,8 +987,6 @@ int find_acpi_cache_level_from_id(u32 cache_id)
 	 * to find the level...
 	 */
 	for_each_possible_cpu(cpu) {
-
-		num_levels = 0;
 		acpi_cpu_id = get_acpi_id_for_cpu(cpu);
 		cpu_node = acpi_find_processor_node(table, acpi_cpu_id);
 		if (!cpu_node)
@@ -1019,75 +1016,3 @@ int find_acpi_cache_level_from_id(u32 cache_id)
 	acpi_put_table(table);
 	return -ENOENT;
 }
-
-/**
- * acpi_pptt_get_cpumask_from_cache_id() - Get the cpus associated with the
- * 					   specified cache
- * @cache_id: The id field of the unified cache
- * @cpus: Where to buidl the cpumask
- *
- * Determine which CPUs are below this cache in the PPTT. This allows the property
- * to be found even if the CPUs are offline.
- *
- * The PPTT table must be rev 3 or later,
- *
- * Return: -ENOENT if the PPTT doesn't exist, or the cache cannot be found.
- * Otherwise returns 0 and sets the cpus in the provided cpumask.
- */
-int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id, cpumask_t *cpus)
-{
-	u32 acpi_cpu_id;
-	acpi_status status;
-	int level, cpu, num_levels;
-	struct acpi_pptt_cache *cache;
-	struct acpi_table_header *table;
-	struct acpi_pptt_cache_v1* cache_v1;
-	struct acpi_pptt_processor *cpu_node;
-
-	cpumask_clear(cpus);
-
-	status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
-	if (ACPI_FAILURE(status)) {
-		acpi_pptt_warn_missing();
-		return -ENOENT;
-	}
-
-	if (table->revision < 3) {
-		acpi_put_table(table);
-		return -ENOENT;
-	}
-
-	/*
-	 * If we found the cache first, we'd still need to walk from each cpu.
-	 */
-	for_each_possible_cpu(cpu) {
-
-		num_levels = 0;
-		acpi_cpu_id = get_acpi_id_for_cpu(cpu);
-		cpu_node = acpi_find_processor_node(table, acpi_cpu_id);
-		if (!cpu_node)
-			break;
-		acpi_count_levels(table, cpu_node, &num_levels, NULL);
-
-		/* Start at 1 for L1 */
-		for (level = 1; level <= num_levels; level++) {
-			cache = acpi_find_cache_node(table, acpi_cpu_id,
-						     ACPI_PPTT_CACHE_TYPE_UNIFIED,
-						     level, &cpu_node);
-			if (!cache)
-				continue;
-
-			cache_v1 = ACPI_ADD_PTR(struct acpi_pptt_cache_v1,
-						cache,
-						sizeof(struct acpi_pptt_cache));
-
-			if (cache->flags & ACPI_PPTT_CACHE_ID_VALID &&
-			    cache_v1->cache_id == cache_id) {
-				cpumask_set_cpu(cpu, cpus);
-			}
-		}
-	}
-
-	acpi_put_table(table);
-	return 0;
-}
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 0ef4b9427e99..b12b4504d443 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1495,7 +1495,6 @@ int find_acpi_cpu_topology_package(unsigned int cpu);
 int find_acpi_cpu_topology_hetero_id(unsigned int cpu);
 int find_acpi_cache_level_from_id(u32 cache_id);
 int acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id, cpumask_t *cpus);
-int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id, cpumask_t *cpus);
 #else
 static inline int acpi_pptt_cpu_is_thread(unsigned int cpu)
 {
@@ -1526,11 +1525,6 @@ static inline int acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id,
 {
 	return -EINVAL;
 }
-static inline int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id,
-						      cpumask_t *cpus)
-{
-	return -EINVAL;
-}
 #endif
 
 #ifdef CONFIG_ARM64
-- 
Gitee


From 42a3667da701da2d4de2ea305b27be1b3bebc13d Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:25 -0800
Subject: [PATCH 117/280] anolis: Revert "ACPI / PPTT: Add a helper to fill a
 cpumask from a processor container"

ANBZ: #31045

This reverts commit f58f05b651e2e23681165480ea01bd375c52b424.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/acpi/pptt.c  | 67 --------------------------------------------
 include/linux/acpi.h |  6 ----
 2 files changed, 73 deletions(-)

diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
index 19fbda328cd8..67e634802c88 100644
--- a/drivers/acpi/pptt.c
+++ b/drivers/acpi/pptt.c
@@ -300,38 +300,6 @@ static struct acpi_pptt_processor *acpi_find_processor_node(struct acpi_table_he
 	return NULL;
 }
 
-/* parent_node points into the table, but the table isn't provided. */
-static void acpi_pptt_get_child_cpus(struct acpi_pptt_processor *parent_node,
-				     cpumask_t *cpus)
-{
-	struct acpi_pptt_processor *cpu_node;
-	struct acpi_table_header *table_hdr;
-	acpi_status status;
-	u32 acpi_id;
-	int cpu;
-
-	status = acpi_get_table(ACPI_SIG_PPTT, 0, &table_hdr);
-	if (ACPI_FAILURE(status))
-		return;
-
-	for_each_possible_cpu(cpu) {
-		acpi_id = get_acpi_id_for_cpu(cpu);
-		cpu_node = acpi_find_processor_node(table_hdr, acpi_id);
-
-		while (cpu_node) {
-			if (cpu_node == parent_node) {
-				cpumask_set_cpu(cpu, cpus);
-				break;
-			}
-			cpu_node = fetch_pptt_node(table_hdr, cpu_node->parent);
-		}
-	}
-
-	acpi_put_table(table_hdr);
-
-	return;
-}
-
 /**
  * acpi_pptt_for_each_container() - Iterate over all processor containers
  *
@@ -388,41 +356,6 @@ int acpi_pptt_for_each_container(acpi_pptt_cpu_callback_t callback, void *arg)
 	return ret;
 }
 
-struct __cpus_from_container_arg {
-	u32 acpi_cpu_id;
-	cpumask_t *cpus;
-};
-
-static int __cpus_from_container(struct acpi_pptt_processor *container, void *arg)
-{
-	struct __cpus_from_container_arg *params = arg;
-
-	if (container->acpi_processor_id == params->acpi_cpu_id)
-		acpi_pptt_get_child_cpus(container, params->cpus);
-
-	return 0;
-}
-
-/**
- * acpi_pptt_get_cpus_from_container() - Populate a cpumask with all CPUs in a
- * 					 processor containers
- *
- * Find the specified Processor Container, and fill cpus with all the cpus
- * below it.
- *
- * Return: 0 for a complete walk, or an error if the mask is incomplete.
- */
-int acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id, cpumask_t *cpus)
-{
-	struct __cpus_from_container_arg params;
-
-	params.acpi_cpu_id = acpi_cpu_id;
-	params.cpus = cpus;
-
-	cpumask_clear(cpus);
-	return acpi_pptt_for_each_container(&__cpus_from_container, &params);
-}
-
 static u8 acpi_cache_type(enum cache_type type)
 {
 	switch (type) {
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index b12b4504d443..603578c6f8e9 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1494,7 +1494,6 @@ int find_acpi_cpu_topology_cluster(unsigned int cpu);
 int find_acpi_cpu_topology_package(unsigned int cpu);
 int find_acpi_cpu_topology_hetero_id(unsigned int cpu);
 int find_acpi_cache_level_from_id(u32 cache_id);
-int acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id, cpumask_t *cpus);
 #else
 static inline int acpi_pptt_cpu_is_thread(unsigned int cpu)
 {
@@ -1520,11 +1519,6 @@ static inline int find_acpi_cache_level_from_id(u32 cache_id)
 {
 	return -EINVAL;
 }
-static inline int acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id,
-						    cpumask_t *cpus)
-{
-	return -EINVAL;
-}
 #endif
 
 #ifdef CONFIG_ARM64
-- 
Gitee


From 61f1fa9b0e82475c2be2322e7b6cbc6c0db1121a Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:25 -0800
Subject: [PATCH 118/280] anolis: Revert "ACPI / PPTT: Find PPTT cache level by
 ID"

ANBZ: #31045

This reverts commit f1bb7bf47d797d16f3667d998ae4ffed084085df.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/acpi/pptt.c  | 74 --------------------------------------------
 include/linux/acpi.h |  5 ---
 2 files changed, 79 deletions(-)

diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
index 67e634802c88..96927da9ea14 100644
--- a/drivers/acpi/pptt.c
+++ b/drivers/acpi/pptt.c
@@ -875,77 +875,3 @@ int find_acpi_cpu_topology_hetero_id(unsigned int cpu)
 	return find_acpi_cpu_topology_tag(cpu, PPTT_ABORT_PACKAGE,
 					  ACPI_PPTT_ACPI_IDENTICAL);
 }
-
-
-/**
- * find_acpi_cache_level_from_id() - Get the level of the specified cache
- * @cache_id: The id field of the unified cache
- *
- * Determine the level relative to any CPU for the unified cache identified by
- * cache_id. This allows the property to be found even if the CPUs are offline.
- *
- * The returned level can be used to group unified caches that are peers.
- *
- * The PPTT table must be rev 3 or later,
- *
- * If one CPUs L2 is shared with another as L3, this function will return
- * and unpredictable value.
- *
- * Return: -ENOENT if the PPTT doesn't exist, or the cache cannot be found.
- * Otherwise returns a value which represents the level of the specified cache.
- */
-int find_acpi_cache_level_from_id(u32 cache_id)
-{
-	u32 acpi_cpu_id;
-	acpi_status status;
-	int level, cpu, num_levels;
-	struct acpi_pptt_cache *cache;
-	struct acpi_table_header *table;
-	struct acpi_pptt_cache_v1* cache_v1;
-	struct acpi_pptt_processor *cpu_node;
-
-	status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
-	if (ACPI_FAILURE(status)) {
-		acpi_pptt_warn_missing();
-		return -ENOENT;
-	}
-
-	if (table->revision < 3) {
-		acpi_put_table(table);
-		return -ENOENT;
-	}
-
-	/*
-	 * If we found the cache first, we'd still need to walk from each CPU
-	 * to find the level...
-	 */
-	for_each_possible_cpu(cpu) {
-		acpi_cpu_id = get_acpi_id_for_cpu(cpu);
-		cpu_node = acpi_find_processor_node(table, acpi_cpu_id);
-		if (!cpu_node)
-			break;
-		acpi_count_levels(table, cpu_node, &num_levels, NULL);
-
-		/* Start at 1 for L1 */
-		for (level = 1; level <= num_levels; level++) {
-			cache = acpi_find_cache_node(table, acpi_cpu_id,
-						     ACPI_PPTT_CACHE_TYPE_UNIFIED,
-						     level, &cpu_node);
-			if (!cache)
-				continue;
-
-			cache_v1 = ACPI_ADD_PTR(struct acpi_pptt_cache_v1,
-						cache,
-						sizeof(struct acpi_pptt_cache));
-
-			if (cache->flags & ACPI_PPTT_CACHE_ID_VALID &&
-			    cache_v1->cache_id == cache_id) {
-				acpi_put_table(table);
-				return level;
-			}
-		}
-	}
-
-	acpi_put_table(table);
-	return -ENOENT;
-}
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 603578c6f8e9..8ac16b6967d8 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1493,7 +1493,6 @@ int find_acpi_cpu_topology(unsigned int cpu, int level);
 int find_acpi_cpu_topology_cluster(unsigned int cpu);
 int find_acpi_cpu_topology_package(unsigned int cpu);
 int find_acpi_cpu_topology_hetero_id(unsigned int cpu);
-int find_acpi_cache_level_from_id(u32 cache_id);
 #else
 static inline int acpi_pptt_cpu_is_thread(unsigned int cpu)
 {
@@ -1515,10 +1514,6 @@ static inline int find_acpi_cpu_topology_hetero_id(unsigned int cpu)
 {
 	return -EINVAL;
 }
-static inline int find_acpi_cache_level_from_id(u32 cache_id)
-{
-	return -EINVAL;
-}
 #endif
 
 #ifdef CONFIG_ARM64
-- 
Gitee


From 00a2542cd4a21cce5bcdad5eb0687d87362be623 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:25 -0800
Subject: [PATCH 119/280] anolis: Revert "ACPI / PPTT: Provide a helper to walk
 processor containers"

ANBZ: #31045

This reverts commit 93e30b21d130070a7132d2cea26c06e33b598cd5.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 drivers/acpi/pptt.c | 58 ---------------------------------------------
 1 file changed, 58 deletions(-)

diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
index 96927da9ea14..54676e3d82dd 100644
--- a/drivers/acpi/pptt.c
+++ b/drivers/acpi/pptt.c
@@ -21,8 +21,6 @@
 #include <linux/cacheinfo.h>
 #include <acpi/processor.h>
 
-typedef int (*acpi_pptt_cpu_callback_t)(struct acpi_pptt_processor *, void *);
-
 static struct acpi_subtable_header *fetch_pptt_subtable(struct acpi_table_header *table_hdr,
 							u32 pptt_ref)
 {
@@ -300,62 +298,6 @@ static struct acpi_pptt_processor *acpi_find_processor_node(struct acpi_table_he
 	return NULL;
 }
 
-/**
- * acpi_pptt_for_each_container() - Iterate over all processor containers
- *
- * Not all 'Processor' entries in the PPTT are either a CPU or a Processor
- * Container, they may exist purely to describe a Private resource. CPUs
- * have to be leaves, so a Processor Container is a non-leaf that has the
- * 'ACPI Processor ID valid' flag set.
- *
- * Return: 0 for a complete walk, or the first non-zero value from the callback
- *         that stopped the walk.
- */
-int acpi_pptt_for_each_container(acpi_pptt_cpu_callback_t callback, void *arg)
-{
-	struct acpi_pptt_processor *cpu_node;
-	struct acpi_table_header *table_hdr;
-	struct acpi_subtable_header *entry;
-	bool leaf_flag, has_leaf_flag = false;
-	unsigned long table_end;
-	acpi_status status;
-	u32 proc_sz;
-	int ret = 0;
-
-	status = acpi_get_table(ACPI_SIG_PPTT, 0, &table_hdr);
-	if (ACPI_FAILURE(status))
-		return 0;
-
-	if (table_hdr->revision > 1)
-		has_leaf_flag = true;
-
-	table_end = (unsigned long)table_hdr + table_hdr->length;
-	entry = ACPI_ADD_PTR(struct acpi_subtable_header, table_hdr,
-			     sizeof(struct acpi_table_pptt));
-	proc_sz = sizeof(struct acpi_pptt_processor);
-	while ((unsigned long)entry + proc_sz < table_end) {
-		cpu_node = (struct acpi_pptt_processor *)entry;
-		if (entry->type == ACPI_PPTT_TYPE_PROCESSOR &&
-		    cpu_node->flags & ACPI_PPTT_ACPI_PROCESSOR_ID_VALID)
-		{
-			leaf_flag = cpu_node->flags & ACPI_PPTT_ACPI_LEAF_NODE;
-			if ((has_leaf_flag && !leaf_flag) ||
-			    (!has_leaf_flag && !acpi_pptt_leaf_node(table_hdr, cpu_node)))
-			{
-				ret = callback(cpu_node, arg);
-				if (ret)
-					break;
-			}
-		}
-		entry = ACPI_ADD_PTR(struct acpi_subtable_header, entry,
-				     entry->length);
-	}
-
-	acpi_put_table(table_hdr);
-
-	return ret;
-}
-
 static u8 acpi_cache_type(enum cache_type type)
 {
 	switch (type) {
-- 
Gitee


From ca0d6ee3d0fe7a0e53b6488b7d701fbb8079cba0 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:25 -0800
Subject: [PATCH 120/280] anolis: Revert "untested: KVM: arm64: Force guest EL1
 to use user-space's partid configuration"

ANBZ: #31045

This reverts commit b755238aaeac2bd4e3241a9d1f446dea027e3eb7.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h | 27 ----------------------
 arch/arm64/kvm/hyp/nvhe/switch.c           | 11 ---------
 arch/arm64/kvm/hyp/vhe/sysreg-sr.c         |  1 -
 3 files changed, 39 deletions(-)

diff --git a/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h b/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h
index c8767abd693e..bb6b571ec627 100644
--- a/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h
+++ b/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h
@@ -15,7 +15,6 @@
 #include <asm/kvm_emulate.h>
 #include <asm/kvm_hyp.h>
 #include <asm/kvm_mmu.h>
-#include <asm/mpam.h>
 
 static inline void __sysreg_save_common_state(struct kvm_cpu_context *ctxt)
 {
@@ -244,30 +243,4 @@ static inline void __sysreg32_restore_state(struct kvm_vcpu *vcpu)
 		write_sysreg(__vcpu_sys_reg(vcpu, DBGVCR32_EL2), dbgvcr32_el2);
 }
 
-/*
- * The _EL0 value was written by the host's context switch, copy this into the
- * guest's EL1.
- */
-static inline void __mpam_guest_load(void)
-{
-	if (IS_ENABLED(CONFIG_ARM64_MPAM) && mpam_cpus_have_feature())
-		write_sysreg_el1(read_sysreg_s(SYS_MPAM0_EL1), SYS_MPAM1);
-}
-
-/*
- * Copy the _EL2 register back to _EL1, clearing any trap bits EL2 may have set.
- * nVHE world-switch copies the _EL1 register to _EL2. A VHE host writes to the
- * _EL2 register as it is aliased by the hardware when TGE is set.
- */
-static inline void __mpam_guest_put(void)
-{
-	u64 val, mask = MPAM_SYSREG_PMG_D | MPAM_SYSREG_PMG_I |
-			MPAM_SYSREG_PARTID_D | MPAM_SYSREG_PARTID_I;
-
-	if (IS_ENABLED(CONFIG_ARM64_MPAM) && mpam_cpus_have_feature()) {
-		val = FIELD_GET(mask, read_sysreg_s(SYS_MPAM2_EL2));
-		write_sysreg_el1(val, SYS_MPAM1);
-	}
-}
-
 #endif /* __ARM64_KVM_HYP_SYSREG_SR_H__ */
diff --git a/arch/arm64/kvm/hyp/nvhe/switch.c b/arch/arm64/kvm/hyp/nvhe/switch.c
index 3ff46a88f1f4..f1970816fa43 100644
--- a/arch/arm64/kvm/hyp/nvhe/switch.c
+++ b/arch/arm64/kvm/hyp/nvhe/switch.c
@@ -282,13 +282,6 @@ static inline bool fixup_guest_exit(struct kvm_vcpu *vcpu, u64 *exit_code)
 	return __fixup_guest_exit(vcpu, exit_code, handlers);
 }
 
-/* Use the host thread's partid and pmg for world switch */
-static void __mpam_copy_el1_to_el2(void)
-{
-	if (IS_ENABLED(CONFIG_ARM64_MPAM) && mpam_cpus_have_feature())
-		write_sysreg_s(read_sysreg_s(SYS_MPAM1_EL1), SYS_MPAM2_EL2);
-}
-
 /* Switch to the guest for legacy non-VHE systems */
 int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
 {
@@ -298,8 +291,6 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
 	bool pmu_switch_needed;
 	u64 exit_code;
 
-	__mpam_copy_el1_to_el2();
-
 	/*
 	 * Having IRQs masked via PMR when entering the guest means the GIC
 	 * will not signal the CPU of interrupts of lower priority, and the
@@ -359,7 +350,6 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
 	__timer_enable_traps(vcpu);
 
 	__debug_switch_to_guest(vcpu);
-	__mpam_guest_load();
 
 	do {
 		/* Jump in the fire! */
@@ -370,7 +360,6 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
 
 	__sysreg_save_state_nvhe(guest_ctxt);
 	__sysreg32_save_state(vcpu);
-	__mpam_guest_put();
 	__timer_disable_traps(vcpu);
 	__hyp_vgic_save_state(vcpu);
 
diff --git a/arch/arm64/kvm/hyp/vhe/sysreg-sr.c b/arch/arm64/kvm/hyp/vhe/sysreg-sr.c
index 71af2f8c7568..ae763061909a 100644
--- a/arch/arm64/kvm/hyp/vhe/sysreg-sr.c
+++ b/arch/arm64/kvm/hyp/vhe/sysreg-sr.c
@@ -90,7 +90,6 @@ void __vcpu_load_switch_sysregs(struct kvm_vcpu *vcpu)
 	__sysreg32_restore_state(vcpu);
 	__sysreg_restore_user_state(guest_ctxt);
 	__sysreg_restore_el1_state(guest_ctxt);
-	__mpam_guest_load();
 
 	vcpu_set_flag(vcpu, SYSREGS_ON_CPU);
 }
-- 
Gitee


From 4c3d589463b7c43f03812c134a2796f15cdc8dbf Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:46:25 -0800
Subject: [PATCH 121/280] anolis: Revert "arm64: mpam: Context switch the MPAM
 registers"

ANBZ: #31045

This reverts commit db08e78d00b8608723221714859b0ce1890fcaf5.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/arm64/include/asm/mpam.h        | 46 ----------------------------
 arch/arm64/include/asm/thread_info.h |  3 --
 arch/arm64/kernel/mpam.c             |  4 ---
 arch/arm64/kernel/process.c          |  7 -----
 4 files changed, 60 deletions(-)

diff --git a/arch/arm64/include/asm/mpam.h b/arch/arm64/include/asm/mpam.h
index 1d81a6f26acd..576102d510ad 100644
--- a/arch/arm64/include/asm/mpam.h
+++ b/arch/arm64/include/asm/mpam.h
@@ -7,8 +7,6 @@
 #include <linux/bitops.h>
 #include <linux/init.h>
 #include <linux/jump_label.h>
-#include <linux/percpu.h>
-#include <linux/sched.h>
 
 #include <asm/cpucaps.h>
 #include <asm/cpufeature.h>
@@ -51,9 +49,6 @@
 
 
 DECLARE_STATIC_KEY_FALSE(arm64_mpam_has_hcr);
-DECLARE_STATIC_KEY_FALSE(mpam_enabled);
-DECLARE_PER_CPU(u64, arm64_mpam_default);
-DECLARE_PER_CPU(u64, arm64_mpam_current);
 
 /* check whether all CPUs have MPAM support */
 static __always_inline bool mpam_cpus_have_feature(void)
@@ -78,45 +73,4 @@ static inline void __init __enable_mpam_hcr(void)
 		static_branch_enable(&arm64_mpam_has_hcr);
 }
 
-/*
- * The resctrl filesystem writes to the partid/pmg values for threads and CPUs,
- * which may race with reads in __mpam_sched_in(). Ensure only one of the old
- * or new values are used. Particular care should be taken with the pmg field
- * as __mpam_sched_in() may read a partid and pmg that don't match, causing
- * this value to be stored with cache allocations, despite being considered
- * 'free' by resctrl.
- *
- * A value in struct thread_info is used instead of struct task_struct as the
- * cpu's u64 register format is used, but struct task_struct has two u32'.
- */
-static inline u64 mpam_get_regval(struct task_struct *tsk)
-{
-#ifdef CONFIG_ARM64_MPAM
-	return READ_ONCE(task_thread_info(tsk)->mpam_partid_pmg);
-#else
-	return 0;
-#endif
-}
-
-static inline void mpam_thread_switch(struct task_struct *tsk)
-{
-	u64 oldregval;
-	int cpu = smp_processor_id();
-	u64 regval = mpam_get_regval(tsk);
-
-	if (!IS_ENABLED(CONFIG_ARM64_MPAM) ||
-	    !static_branch_likely(&mpam_enabled))
-		return;
-
-	if (!regval)
-		regval = READ_ONCE(per_cpu(arm64_mpam_default, cpu));
-
-	oldregval = READ_ONCE(per_cpu(arm64_mpam_current, cpu));
-	if (oldregval == regval)
-		return;
-
-	/* Synchronising this write is left until the ERET to EL0 */
-	write_sysreg_s(regval, SYS_MPAM0_EL1);
-	WRITE_ONCE(per_cpu(arm64_mpam_current, cpu), regval);
-}
 #endif /* __ASM__MPAM_H */
diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index f36803eb2ebd..872b8e810a37 100644
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -41,9 +41,6 @@ struct thread_info {
 #ifdef CONFIG_SHADOW_CALL_STACK
 	void			*scs_base;
 	void			*scs_sp;
-#endif
-#ifdef CONFIG_ARM64_MPAM
-	u64			mpam_partid_pmg;
 #endif
 	u32			cpu;
 };
diff --git a/arch/arm64/kernel/mpam.c b/arch/arm64/kernel/mpam.c
index 346f0273b2c5..ff29b666e025 100644
--- a/arch/arm64/kernel/mpam.c
+++ b/arch/arm64/kernel/mpam.c
@@ -4,9 +4,5 @@
 #include <asm/mpam.h>
 
 #include <linux/jump_label.h>
-#include <linux/percpu.h>
 
 DEFINE_STATIC_KEY_FALSE(arm64_mpam_has_hcr);
-DEFINE_STATIC_KEY_FALSE(mpam_enabled);
-DEFINE_PER_CPU(u64, arm64_mpam_default);
-DEFINE_PER_CPU(u64, arm64_mpam_current);
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index c3b83023851f..a44f0e97f6d7 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -49,7 +49,6 @@
 #include <asm/exec.h>
 #include <asm/fpsimd.h>
 #include <asm/mmu_context.h>
-#include <asm/mpam.h>
 #include <asm/mte.h>
 #include <asm/processor.h>
 #include <asm/pointer_auth.h>
@@ -578,12 +577,6 @@ struct task_struct *__switch_to(struct task_struct *prev,
 	if (prev->thread.sctlr_user != next->thread.sctlr_user)
 		update_sctlr_el1(next->thread.sctlr_user);
 
-	/*
-	 * MPAM thread switch happens after the DSB to ensure prev's accesses
-	 * use prev's MPAM settings.
-	 */
-	mpam_thread_switch(next);
-
 	/* the actual thread switch */
 	last = cpu_switch_to(prev, next);
 
-- 
Gitee


From f540bf18d43e1259f450cfac234850d344f47ec4 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:47:24 -0800
Subject: [PATCH 122/280] anolis: Revert "KVM: arm64: Disable MPAM visibility
 by default, and handle traps"

ANBZ: #31045

This reverts commit b56998c7ab741b1917e318a15a639d1ec234d597.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/arm64/kvm/sys_regs.c | 69 +++++++++------------------------------
 1 file changed, 15 insertions(+), 54 deletions(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 7738226ef8cf..e6453a0938de 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -418,29 +418,21 @@ static bool trap_oslar_el1(struct kvm_vcpu *vcpu,
 	return true;
 }
 
-static bool trap_mpam(struct kvm_vcpu *vcpu,
-		      struct sys_reg_params *p,
-		      const struct sys_reg_desc *r)
+static bool workaround_bad_mpam_abi(struct kvm_vcpu *vcpu,
+				    struct sys_reg_params *p,
+				    const struct sys_reg_desc *r)
 {
-	u64 aa64pfr0_el1 = IDREG(vcpu->kvm, SYS_ID_AA64PFR0_EL1);
-
 	/*
-	 * What did we expose to the guest?
-	 * Earlier guests may have seen the ID bits, which can't be removed
-	 * without breaking migration, but MPAMIDR_EL1 can advertise all-zeroes,
-	 * indicating there are zero PARTID/PMG supported by the CPU, allowing
-	 * the other two trapped registers (MPAM1_EL1 and MPAM0_EL1) to be
-	 * treated as RAZ/WI.
+	 * The ID register can't be removed without breaking migration,
+	 * but MPAMIDR_EL1 can advertise all-zeroes, indicating there are zero
+	 * PARTID/PMG supported by the CPU, allowing the other two trapped
+	 * registers (MPAM1_EL1 and MPAM0_EL1) to be treated as RAZ/WI.
 	 * Emulating MPAM1_EL1 as RAZ/WI means the guest sees the MPAMEN bit
 	 * as clear, and realises MPAM isn't usable on this CPU.
 	 */
-	if (FIELD_GET(ID_AA64PFR0_EL1_MPAM_MASK, aa64pfr0_el1)) {
-		p->regval = 0;
-		return true;
-	}
+	p->regval = 0;
 
-	kvm_inject_undefined(vcpu);
-	return false;
+	return true;
 }
 
 static bool trap_oslsr_el1(struct kvm_vcpu *vcpu,
@@ -1341,36 +1333,6 @@ static s64 kvm_arm64_ftr_safe_value(u32 id, const struct arm64_ftr_bits *ftrp,
 	return arm64_ftr_safe_value(&kvm_ftr, new, cur);
 }
 
-static u64 kvm_arm64_ftr_max(struct kvm_vcpu *vcpu,
-			     const struct sys_reg_desc *rd)
-{
-	u64 pfr0, val = rd->reset(vcpu, rd);
-	u32 field, id = reg_to_encoding(rd);
-
-	/*
-	 * Some values may reset to a lower value than can be supported,
-	 * get the maximum feature value.
-	 */
-	switch (id) {
-	case SYS_ID_AA64PFR0_EL1:
-		pfr0 = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1);
-
-		/*
-		 * MPAM resets to 0, but migration of MPAM=1 guests is needed.
-		 * See trap_mpam() for more.
-		 */
-		field = cpuid_feature_extract_unsigned_field(pfr0, ID_AA64PFR0_EL1_MPAM_SHIFT);
-		if (field == ID_AA64PFR0_EL1_MPAM_1) {
-			val &= ~ID_AA64PFR0_EL1_MPAM_MASK;
-			val |= FIELD_PREP(ID_AA64PFR0_EL1_MPAM_MASK, ID_AA64PFR0_EL1_MPAM_1);
-		}
-
-		break;
-	}
-
-	return val;
-}
-
 /**
  * arm64_check_features() - Check if a feature register value constitutes
  * a subset of features indicated by the idreg's KVM sanitised limit.
@@ -1391,7 +1353,8 @@ static int arm64_check_features(struct kvm_vcpu *vcpu,
 	const struct arm64_ftr_bits *ftrp = NULL;
 	u32 id = reg_to_encoding(rd);
 	u64 writable_mask = rd->val;
-	u64 limit, mask = 0;
+	u64 limit = rd->reset(vcpu, rd);
+	u64 mask = 0;
 	u32 midr = read_cpuid_id();
 
 	/*
@@ -1406,7 +1369,6 @@ static int arm64_check_features(struct kvm_vcpu *vcpu,
 	if (!ftr_reg)
 		return -EINVAL;
 
-	limit = kvm_arm64_ftr_max(vcpu, rd);
 	ftrp = ftr_reg->ftr_bits;
 
 	for (; ftrp && ftrp->width; ftrp++) {
@@ -1624,8 +1586,7 @@ static u64 read_sanitised_id_aa64pfr0_el1(struct kvm_vcpu *vcpu,
 	/*
 	 * MPAM is disabled by default as KVM also needs a set of PARTID to
 	 * program the MPAMVPMx_EL2 PARTID remapping registers with. But some
-	 * older kernels let the guest see the ID bit. Turning it on causes
-	 * the registers to be emulated as RAZ/WI. See trap_mpam() for more.
+	 * older kernels let the guest see the ID bit.
 	 */
 	val &= ~ID_AA64PFR0_EL1_MPAM_MASK;
 
@@ -2393,11 +2354,11 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	{ SYS_DESC(SYS_LOREA_EL1), trap_loregion },
 	{ SYS_DESC(SYS_LORN_EL1), trap_loregion },
 	{ SYS_DESC(SYS_LORC_EL1), trap_loregion },
-	{ SYS_DESC(SYS_MPAMIDR_EL1), trap_mpam },
+	{ SYS_DESC(SYS_MPAMIDR_EL1), workaround_bad_mpam_abi },
 	{ SYS_DESC(SYS_LORID_EL1), trap_loregion },
 
-	{ SYS_DESC(SYS_MPAM1_EL1), trap_mpam },
-	{ SYS_DESC(SYS_MPAM0_EL1), trap_mpam },
+	{ SYS_DESC(SYS_MPAM1_EL1), workaround_bad_mpam_abi },
+	{ SYS_DESC(SYS_MPAM0_EL1), workaround_bad_mpam_abi },
 	{ SYS_DESC(SYS_VBAR_EL1), access_rw, reset_val, VBAR_EL1, 0 },
 	{ SYS_DESC(SYS_DISR_EL1), NULL, reset_val, DISR_EL1, 0 },
 
-- 
Gitee


From 5e34108c347e9fe1a8ef32ec328094ab7539b29a Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:47:24 -0800
Subject: [PATCH 123/280] anolis: Revert "KVM: arm64: Fix missing traps of
 guest accesses to the MPAM registers"

ANBZ: #31045

This reverts commit 1348610175294cc4a7f6cd8f5841738ee7f789f8.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/arm64/include/asm/kvm_arm.h        |  1 -
 arch/arm64/include/asm/mpam.h           |  4 ++--
 arch/arm64/kernel/image-vars.h          |  5 ----
 arch/arm64/kvm/hyp/include/hyp/switch.h | 32 -------------------------
 arch/arm64/kvm/sys_regs.c               | 20 ----------------
 5 files changed, 2 insertions(+), 60 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 96c7aad7cc43..c11010965b8e 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -108,7 +108,6 @@
 
 #define HCRX_GUEST_FLAGS (HCRX_EL2_SMPME | HCRX_EL2_TCR2En)
 #define HCRX_HOST_FLAGS (HCRX_EL2_MSCEn | HCRX_EL2_TCR2En | HCRX_EL2_EnFPM)
-#define MPAMHCR_HOST_FLAGS	0
 
 /* TCR_EL2 Registers bits */
 #define TCR_EL2_RES1		((1U << 31) | (1 << 23))
diff --git a/arch/arm64/include/asm/mpam.h b/arch/arm64/include/asm/mpam.h
index 576102d510ad..a4a969be233a 100644
--- a/arch/arm64/include/asm/mpam.h
+++ b/arch/arm64/include/asm/mpam.h
@@ -51,7 +51,7 @@
 DECLARE_STATIC_KEY_FALSE(arm64_mpam_has_hcr);
 
 /* check whether all CPUs have MPAM support */
-static __always_inline bool mpam_cpus_have_feature(void)
+static inline bool mpam_cpus_have_feature(void)
 {
 	if (IS_ENABLED(CONFIG_ARM64_MPAM))
 		return cpus_have_final_cap(ARM64_MPAM);
@@ -59,7 +59,7 @@ static __always_inline bool mpam_cpus_have_feature(void)
 }
 
 /* check whether all CPUs have MPAM virtualisation support */
-static __always_inline bool mpam_cpus_have_mpam_hcr(void)
+static inline bool mpam_cpus_have_mpam_hcr(void)
 {
 	if (IS_ENABLED(CONFIG_ARM64_MPAM))
 		return static_branch_unlikely(&arm64_mpam_has_hcr);
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index d10d3fed31d9..35f3c7959513 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -64,11 +64,6 @@ KVM_NVHE_ALIAS(nvhe_hyp_panic_handler);
 /* Vectors installed by hyp-init on reset HVC. */
 KVM_NVHE_ALIAS(__hyp_stub_vectors);
 
-/* Additional static keys for cpufeatures */
-#ifdef CONFIG_ARM64_MPAM
-KVM_NVHE_ALIAS(arm64_mpam_has_hcr);
-#endif
-
 /* Static keys which are set if a vGIC trap should be handled in hyp. */
 KVM_NVHE_ALIAS(vgic_v2_cpuif_trap);
 KVM_NVHE_ALIAS(vgic_v3_cpuif_trap);
diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
index 2679527eb2f3..2b6c9724d55f 100644
--- a/arch/arm64/kvm/hyp/include/hyp/switch.h
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -27,7 +27,6 @@
 #include <asm/kvm_hyp.h>
 #include <asm/kvm_mmu.h>
 #include <asm/kvm_nested.h>
-#include <asm/mpam.h>
 #include <asm/fpsimd.h>
 #include <asm/debug-monitors.h>
 #include <asm/processor.h>
@@ -173,35 +172,6 @@ static inline void __deactivate_traps_hfgxtr(struct kvm_vcpu *vcpu)
 	write_sysreg_s(ctxt_sys_reg(hctxt, HDFGWTR_EL2), SYS_HDFGWTR_EL2);
 }
 
-static inline void  __activate_traps_mpam(struct kvm_vcpu *vcpu)
-{
-	u64 r = MPAM_SYSREG_TRAP_MPAM0_EL1 | MPAM_SYSREG_TRAP_MPAM1_EL1;
-
-	if (!mpam_cpus_have_feature())
-		return;
-
-	/* trap guest access to MPAMIDR_EL1 */
-	if (mpam_cpus_have_mpam_hcr()) {
-		write_sysreg_s(MPAMHCR_TRAP_MPAMIDR, SYS_MPAMHCR_EL2);
-	} else {
-		/* From v1.1 TIDR can trap MPAMIDR, set it unconditionally */
-		r |= MPAM_SYSREG_TRAP_IDR;
-	}
-
-	write_sysreg_s(r, SYS_MPAM2_EL2);
-}
-
-static inline void __deactivate_traps_mpam(void)
-{
-	if (!mpam_cpus_have_feature())
-		return;
-
-	write_sysreg_s(0, SYS_MPAM2_EL2);
-
-	if (mpam_cpus_have_mpam_hcr())
-		write_sysreg_s(MPAMHCR_HOST_FLAGS, SYS_MPAMHCR_EL2);
-}
-
 static inline void __activate_traps_common(struct kvm_vcpu *vcpu)
 {
 	/* Trap on AArch32 cp15 c15 (impdef sysregs) accesses (EL1 or EL0) */
@@ -242,7 +212,6 @@ static inline void __activate_traps_common(struct kvm_vcpu *vcpu)
 	}
 
 	__activate_traps_hfgxtr(vcpu);
-	__activate_traps_mpam(vcpu);
 }
 
 static inline void __deactivate_traps_common(struct kvm_vcpu *vcpu)
@@ -262,7 +231,6 @@ static inline void __deactivate_traps_common(struct kvm_vcpu *vcpu)
 		write_sysreg_s(HCRX_HOST_FLAGS, SYS_HCRX_EL2);
 
 	__deactivate_traps_hfgxtr(vcpu);
-	__deactivate_traps_mpam();
 }
 
 static inline void ___activate_traps(struct kvm_vcpu *vcpu)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index e6453a0938de..623737f65228 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -418,23 +418,6 @@ static bool trap_oslar_el1(struct kvm_vcpu *vcpu,
 	return true;
 }
 
-static bool workaround_bad_mpam_abi(struct kvm_vcpu *vcpu,
-				    struct sys_reg_params *p,
-				    const struct sys_reg_desc *r)
-{
-	/*
-	 * The ID register can't be removed without breaking migration,
-	 * but MPAMIDR_EL1 can advertise all-zeroes, indicating there are zero
-	 * PARTID/PMG supported by the CPU, allowing the other two trapped
-	 * registers (MPAM1_EL1 and MPAM0_EL1) to be treated as RAZ/WI.
-	 * Emulating MPAM1_EL1 as RAZ/WI means the guest sees the MPAMEN bit
-	 * as clear, and realises MPAM isn't usable on this CPU.
-	 */
-	p->regval = 0;
-
-	return true;
-}
-
 static bool trap_oslsr_el1(struct kvm_vcpu *vcpu,
 			   struct sys_reg_params *p,
 			   const struct sys_reg_desc *r)
@@ -2354,11 +2337,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	{ SYS_DESC(SYS_LOREA_EL1), trap_loregion },
 	{ SYS_DESC(SYS_LORN_EL1), trap_loregion },
 	{ SYS_DESC(SYS_LORC_EL1), trap_loregion },
-	{ SYS_DESC(SYS_MPAMIDR_EL1), workaround_bad_mpam_abi },
 	{ SYS_DESC(SYS_LORID_EL1), trap_loregion },
 
-	{ SYS_DESC(SYS_MPAM1_EL1), workaround_bad_mpam_abi },
-	{ SYS_DESC(SYS_MPAM0_EL1), workaround_bad_mpam_abi },
 	{ SYS_DESC(SYS_VBAR_EL1), access_rw, reset_val, VBAR_EL1, 0 },
 	{ SYS_DESC(SYS_DISR_EL1), NULL, reset_val, DISR_EL1, 0 },
 
-- 
Gitee


From 7d8d884ea9035f5a29c0b6f775ba8601ef03cf8d Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:49:27 -0800
Subject: [PATCH 124/280] anolis: Revert "arm64: cpufeature: discover CPU
 support for MPAM"

ANBZ: #31045

This reverts commit fb2ecde8397b4ab884a0f04ea310bfd04c867e29.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 .../arch/arm64/cpu-feature-registers.rst      |  2 -
 arch/arm64/Kconfig                            | 19 +----
 arch/arm64/include/asm/cpu.h                  |  1 -
 arch/arm64/include/asm/cpufeature.h           | 13 ----
 arch/arm64/include/asm/mpam.h                 | 76 -------------------
 arch/arm64/include/asm/sysreg.h               |  8 --
 arch/arm64/kernel/Makefile                    |  2 -
 arch/arm64/kernel/cpufeature.c                | 69 -----------------
 arch/arm64/kernel/cpuinfo.c                   |  4 -
 arch/arm64/kernel/mpam.c                      |  8 --
 arch/arm64/tools/cpucaps                      |  1 -
 arch/arm64/tools/sysreg                       | 33 --------
 12 files changed, 1 insertion(+), 235 deletions(-)
 delete mode 100644 arch/arm64/include/asm/mpam.h
 delete mode 100644 arch/arm64/kernel/mpam.c

diff --git a/Documentation/arch/arm64/cpu-feature-registers.rst b/Documentation/arch/arm64/cpu-feature-registers.rst
index 253e9743de2f..44f9bd78539d 100644
--- a/Documentation/arch/arm64/cpu-feature-registers.rst
+++ b/Documentation/arch/arm64/cpu-feature-registers.rst
@@ -152,8 +152,6 @@ infrastructure:
      +------------------------------+---------+---------+
      | DIT                          | [51-48] |    y    |
      +------------------------------+---------+---------+
-     | MPAM                         | [43-40] |    n    |
-     +------------------------------+---------+---------+
      | SVE                          | [35-32] |    y    |
      +------------------------------+---------+---------+
      | GIC                          | [27-24] |    n    |
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index bd77f5ad4169..acedee7c1667 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -2066,24 +2066,7 @@ config ARM64_TLB_RANGE
 	  The feature introduces new assembly instructions, and they were
 	  support when binutils >= 2.30.
 
-config ARM64_MPAM
-	bool "Enable support for MPAM"
-	help
-	  Memory Partitioning and Monitoring is an optional extension
-	  that allows the CPUs to mark load and store transactions with
-	  labels for partition-id and performance-monitoring-group.
-	  System components, such as the caches, can use the partition-id
-	  to apply a performance policy. MPAM monitors can use the
-	  partition-id and performance-monitoring-group to measure the
-	  cache occupancy or data throughput.
-
-	  Use of this extension requires CPU support, support in the
-	  memory system components (MSC), and a description from firmware
-	  of where the MSC are in the address space.
-
-	  MPAM is exposed to user-space via the resctrl pseudo filesystem.
-
-endmenu
+endmenu # "ARMv8.4 architectural features"
 
 menu "ARMv8.5 architectural features"
 
diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h
index 33328b1d4a39..6344fc126262 100644
--- a/arch/arm64/include/asm/cpu.h
+++ b/arch/arm64/include/asm/cpu.h
@@ -47,7 +47,6 @@ struct cpuinfo_arm64 {
 	u64		reg_revidr;
 	u64		reg_gmid;
 	u64		reg_smidr;
-	u64		reg_mpamidr;
 
 	u64		reg_id_aa64dfr0;
 	u64		reg_id_aa64dfr1;
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 4e980563ad95..4dd7dce1917b 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -619,13 +619,6 @@ static inline bool id_aa64pfr1_sme(u64 pfr1)
 	return val > 0;
 }
 
-static inline bool id_aa64pfr0_mpam(u64 pfr0)
-{
-	u32 val = cpuid_feature_extract_unsigned_field(pfr0, ID_AA64PFR0_EL1_MPAM_SHIFT);
-
-	return val > 0;
-}
-
 static inline bool id_aa64pfr1_mte(u64 pfr1)
 {
 	u32 val = cpuid_feature_extract_unsigned_field(pfr1, ID_AA64PFR1_EL1_MTE_SHIFT);
@@ -855,12 +848,6 @@ static inline bool system_supports_gcs(void)
 		alternative_has_cap_unlikely(ARM64_HAS_GCS);
 }
 
-static inline bool cpus_support_mpam(void)
-{
-	return IS_ENABLED(CONFIG_ARM64_MPAM) &&
-		cpus_have_final_cap(ARM64_MPAM);
-}
-
 int do_emulate_mrs(struct pt_regs *regs, u32 sys_reg, u32 rt);
 bool try_emulate_mrs(struct pt_regs *regs, u32 isn);
 
diff --git a/arch/arm64/include/asm/mpam.h b/arch/arm64/include/asm/mpam.h
deleted file mode 100644
index a4a969be233a..000000000000
--- a/arch/arm64/include/asm/mpam.h
+++ /dev/null
@@ -1,76 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* Copyright (C) 2021 Arm Ltd. */
-
-#ifndef __ASM__MPAM_H
-#define __ASM__MPAM_H
-
-#include <linux/bitops.h>
-#include <linux/init.h>
-#include <linux/jump_label.h>
-
-#include <asm/cpucaps.h>
-#include <asm/cpufeature.h>
-#include <asm/sysreg.h>
-
-/* CPU Registers */
-#define MPAM_SYSREG_EN			BIT_ULL(63)
-#define MPAM_SYSREG_TRAP_IDR		BIT_ULL(58)
-#define MPAM_SYSREG_TRAP_MPAM0_EL1	BIT_ULL(49)
-#define MPAM_SYSREG_TRAP_MPAM1_EL1	BIT_ULL(48)
-#define MPAM_SYSREG_PMG_D		GENMASK(47, 40)
-#define MPAM_SYSREG_PMG_I		GENMASK(39, 32)
-#define MPAM_SYSREG_PARTID_D		GENMASK(31, 16)
-#define MPAM_SYSREG_PARTID_I		GENMASK(15, 0)
-
-#define MPAMIDR_PMG_MAX			GENMASK(40, 32)
-#define MPAMIDR_PMG_MAX_SHIFT		32
-#define MPAMIDR_PMG_MAX_LEN		8
-#define MPAMIDR_VPMR_MAX		GENMASK(20, 18)
-#define MPAMIDR_VPMR_MAX_SHIFT		18
-#define MPAMIDR_VPMR_MAX_LEN		3
-#define MPAMIDR_HAS_HCR			BIT(17)
-#define MPAMIDR_HAS_HCR_SHIFT		17
-#define MPAMIDR_PARTID_MAX		GENMASK(15, 0)
-#define MPAMIDR_PARTID_MAX_SHIFT	0
-#define MPAMIDR_PARTID_MAX_LEN		15
-
-#define MPAMHCR_EL0_VPMEN		BIT_ULL(0)
-#define MPAMHCR_EL1_VPMEN		BIT_ULL(1)
-#define MPAMHCR_GSTAPP_PLK		BIT_ULL(8)
-#define MPAMHCR_TRAP_MPAMIDR		BIT_ULL(31)
-
-/* Properties of the VPM registers */
-#define MPAM_VPM_NUM_REGS		8
-#define MPAM_VPM_PARTID_LEN		16
-#define MPAM_VPM_PARTID_MASK		0xffff
-#define MPAM_VPM_REG_LEN		64
-#define MPAM_VPM_PARTIDS_PER_REG	(MPAM_VPM_REG_LEN / MPAM_VPM_PARTID_LEN)
-#define MPAM_VPM_MAX_PARTID		(MPAM_VPM_NUM_REGS * MPAM_VPM_PARTIDS_PER_REG)
-
-
-DECLARE_STATIC_KEY_FALSE(arm64_mpam_has_hcr);
-
-/* check whether all CPUs have MPAM support */
-static inline bool mpam_cpus_have_feature(void)
-{
-	if (IS_ENABLED(CONFIG_ARM64_MPAM))
-		return cpus_have_final_cap(ARM64_MPAM);
-	return false;
-}
-
-/* check whether all CPUs have MPAM virtualisation support */
-static inline bool mpam_cpus_have_mpam_hcr(void)
-{
-	if (IS_ENABLED(CONFIG_ARM64_MPAM))
-		return static_branch_unlikely(&arm64_mpam_has_hcr);
-	return false;
-}
-
-/* enable MPAM virtualisation support */
-static inline void __init __enable_mpam_hcr(void)
-{
-	if (IS_ENABLED(CONFIG_ARM64_MPAM))
-		static_branch_enable(&arm64_mpam_has_hcr);
-}
-
-#endif /* __ASM__MPAM_H */
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index 752e45c29afa..e4bb2c2a136a 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -503,13 +503,6 @@
 #define SYS_MAIR_EL2			sys_reg(3, 4, 10, 2, 0)
 #define SYS_AMAIR_EL2			sys_reg(3, 4, 10, 3, 0)
 
-#define SYS_MPAMHCR_EL2			sys_reg(3, 4, 10, 4, 0)
-#define SYS_MPAMVPMV_EL2		sys_reg(3, 4, 10, 4, 1)
-#define SYS_MPAM2_EL2			sys_reg(3, 4, 10, 5, 0)
-
-#define __VPMn_op2(n)			((n) & 0x7)
-#define SYS_MPAM_VPMn_EL2(n)		sys_reg(3, 4, 10, 6, __VPMn_op2(n))
-
 #define SYS_VBAR_EL2			sys_reg(3, 4, 12, 0, 0)
 #define SYS_RVBAR_EL2			sys_reg(3, 4, 12, 0, 1)
 #define SYS_RMR_EL2			sys_reg(3, 4, 12, 0, 2)
@@ -574,7 +567,6 @@
 #define SYS_TFSR_EL12			sys_reg(3, 5, 5, 6, 0)
 #define SYS_MAIR_EL12			sys_reg(3, 5, 10, 2, 0)
 #define SYS_AMAIR_EL12			sys_reg(3, 5, 10, 3, 0)
-#define SYS_MPAM1_EL12			sys_reg(3, 5, 10, 5, 0)
 #define SYS_VBAR_EL12			sys_reg(3, 5, 12, 0, 0)
 #define SYS_CNTKCTL_EL12		sys_reg(3, 5, 14, 1, 0)
 #define SYS_CNTP_TVAL_EL02		sys_reg(3, 5, 14, 2, 0)
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index e9827519f567..e3bab76856a3 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -67,13 +67,11 @@ obj-$(CONFIG_KEXEC_CORE)		+= machine_kexec.o relocate_kernel.o	\
 obj-$(CONFIG_KEXEC_FILE)		+= machine_kexec_file.o kexec_image.o
 obj-$(CONFIG_ARM64_RELOC_TEST)		+= arm64-reloc-test.o
 arm64-reloc-test-y := reloc_test_core.o reloc_test_syms.o
-
 obj-$(CONFIG_CRASH_DUMP)		+= crash_dump.o
 obj-$(CONFIG_CRASH_CORE)		+= crash_core.o
 obj-$(CONFIG_ARM_SDE_INTERFACE)		+= sdei.o
 obj-$(CONFIG_SDEI_WATCHDOG)		+= watchdog_sdei.o
 obj-$(CONFIG_ARM64_PTR_AUTH)		+= pointer_auth.o
-obj-$(CONFIG_ARM64_MPAM)		+= mpam.o
 obj-$(CONFIG_ARM64_MTE)			+= mte.o
 obj-y					+= vdso-wrap.o
 obj-$(CONFIG_COMPAT_VDSO)		+= vdso32-wrap.o
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 62eceb2cf5d0..c214639da4a4 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -84,7 +84,6 @@
 #include <asm/insn.h>
 #include <asm/kvm_host.h>
 #include <asm/mmu_context.h>
-#include <asm/mpam.h>
 #include <asm/mte.h>
 #include <asm/processor.h>
 #include <asm/smp.h>
@@ -666,18 +665,6 @@ static const struct arm64_ftr_bits ftr_smcr[] = {
 	ARM64_FTR_END,
 };
 
-static const struct arm64_ftr_bits ftr_mpamidr[] = {
-	ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE,
-		MPAMIDR_PMG_MAX_SHIFT, MPAMIDR_PMG_MAX_LEN, 0),        /* PMG_MAX */
-	ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE,
-		MPAMIDR_VPMR_MAX_SHIFT, MPAMIDR_VPMR_MAX_LEN, 0),      /* VPMR_MAX */
-	ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE,
-		MPAMIDR_HAS_HCR_SHIFT, 1, 0), /* HAS_HCR */
-	ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE,
-		MPAMIDR_PARTID_MAX_SHIFT, MPAMIDR_PARTID_MAX_LEN, 0),  /* PARTID_MAX */
-	ARM64_FTR_END,
-};
-
 /*
  * Common ftr bits for a 32bit register with all hidden, strict
  * attributes, with 4bit feature fields and a default safe value of
@@ -797,9 +784,6 @@ static const struct __ftr_reg_entry {
 	ARM64_FTR_REG(SYS_ZCR_EL1, ftr_zcr),
 	ARM64_FTR_REG(SYS_SMCR_EL1, ftr_smcr),
 
-	/* Op1 = 0, CRn = 10, CRm = 4 */
-	ARM64_FTR_REG(SYS_MPAMIDR_EL1, ftr_mpamidr),
-
 	/* Op1 = 1, CRn = 0, CRm = 0 */
 	ARM64_FTR_REG(SYS_GMID_EL1, ftr_gmid),
 
@@ -1124,9 +1108,6 @@ void __init init_cpu_features(struct cpuinfo_arm64 *info)
 		vec_init_vq_map(ARM64_VEC_SME);
 	}
 
-	if (id_aa64pfr0_mpam(info->reg_id_aa64pfr0))
-		init_cpu_ftr_reg(SYS_MPAMIDR_EL1, info->reg_mpamidr);
-
 	if (id_aa64pfr1_mte(info->reg_id_aa64pfr1))
 		init_cpu_ftr_reg(SYS_GMID_EL1, info->reg_gmid);
 
@@ -1393,11 +1374,6 @@ void update_cpu_features(int cpu,
 			vec_update_vq_map(ARM64_VEC_SME);
 	}
 
-	if (id_aa64pfr0_mpam(info->reg_id_aa64pfr0)) {
-		taint |= check_update_ftr_reg(SYS_MPAMIDR_EL1, cpu,
-					info->reg_mpamidr, boot->reg_mpamidr);
-	}
-
 	/*
 	 * The kernel uses the LDGM/STGM instructions and the number of tags
 	 * they read/write depends on the GMID_EL1.BS field. Check that the
@@ -2350,39 +2326,6 @@ cpucap_panic_on_conflict(const struct arm64_cpu_capabilities *cap)
 	return !!(cap->type & ARM64_CPUCAP_PANIC_ON_CONFLICT);
 }
 
-static bool __maybe_unused
-test_has_mpam(const struct arm64_cpu_capabilities *entry, int scope)
-{
-	if (!has_cpuid_feature(entry, scope))
-		return false;
-
-	/* Check firmware actually enabled MPAM on this cpu. */
-	return (read_sysreg_s(SYS_MPAM1_EL1) & MPAM_SYSREG_EN);
-}
-
-static void __maybe_unused
-cpu_enable_mpam(const struct arm64_cpu_capabilities *entry)
-{
-	/*
-	 * Access by the kernel (at EL1) should use the reserved PARTID
-	 * which is configured unrestricted. This avoids priority-inversion
-	 * where latency sensitive tasks have to wait for a task that has
-	 * been throttled to release the lock.
-	 */
-	write_sysreg_s(0, SYS_MPAM1_EL1);
-}
-
-static void mpam_extra_caps(void)
-{
-	u64 idr = read_sanitised_ftr_reg(SYS_MPAMIDR_EL1);
-
-	if (!IS_ENABLED(CONFIG_ARM64_MPAM))
-		return;
-
-	if (idr & MPAMIDR_HAS_HCR)
-		__enable_mpam_hcr();
-}
-
 static const struct arm64_cpu_capabilities arm64_features[] = {
 	{
 		.capability = ARM64_ALWAYS_BOOT,
@@ -2871,16 +2814,6 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
 		.cpu_enable = cpu_enable_fpmr,
 		ARM64_CPUID_FIELDS(ID_AA64PFR2_EL1, FPMR, IMP)
 	},
-#ifdef CONFIG_ARM64_MPAM
-	{
-		.desc = "Memory Partitioning And Monitoring",
-		.type = ARM64_CPUCAP_SYSTEM_FEATURE,
-		.capability = ARM64_MPAM,
-		.matches = test_has_mpam,
-		.cpu_enable = cpu_enable_mpam,
-		ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, MPAM, 1)
-	},
-#endif
 #ifdef CONFIG_ARM64_POE
 	{
 		.desc = "Stage-1 Permission Overlay Extension (S1POE)",
@@ -3595,8 +3528,6 @@ void __init setup_cpu_features(void)
 	if (!cwg)
 		pr_warn("No Cache Writeback Granule information, assuming %d\n",
 			ARCH_DMA_MINALIGN);
-
-	mpam_extra_caps();
 }
 
 static int enable_mismatched_32bit_el0(unsigned int cpu)
diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index 8a41d13f97d1..d9d5ba68b1d7 100644
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -504,10 +504,6 @@ static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info)
 	if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0))
 		__cpuinfo_store_cpu_32bit(&info->aarch32);
 
-	if (IS_ENABLED(CONFIG_ARM64_MPAM) &&
-	    id_aa64pfr0_mpam(info->reg_id_aa64pfr0))
-		info->reg_mpamidr = read_cpuid(MPAMIDR_EL1);
-
 	cpuinfo_detect_icache_policy(info);
 }
 
diff --git a/arch/arm64/kernel/mpam.c b/arch/arm64/kernel/mpam.c
deleted file mode 100644
index ff29b666e025..000000000000
--- a/arch/arm64/kernel/mpam.c
+++ /dev/null
@@ -1,8 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* Copyright (C) 2021 Arm Ltd. */
-
-#include <asm/mpam.h>
-
-#include <linux/jump_label.h>
-
-DEFINE_STATIC_KEY_FALSE(arm64_mpam_has_hcr);
diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
index 9946e38b2b65..0f68f9430e44 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps
@@ -59,7 +59,6 @@ HW_DBM
 KVM_HVHE
 KVM_PROTECTED_MODE
 MISMATCHED_CACHE_TYPE
-MPAM
 MTE
 MTE_ASYMM
 SME
diff --git a/arch/arm64/tools/sysreg b/arch/arm64/tools/sysreg
index 4ff32f97fcc1..d32d591859bf 100644
--- a/arch/arm64/tools/sysreg
+++ b/arch/arm64/tools/sysreg
@@ -3182,22 +3182,6 @@ Res0	1
 Field	0	EN
 EndSysreg
 
-Sysreg	MPAMIDR_EL1	3	0	10	4	4
-Res0	63:62
-Field	61	HAS_SDEFLT
-Field	60	HAS_FORCE_NS
-Field	59	SP4
-Field	58	HAS_TIDR
-Field	57	HAS_ALTSP
-Res0	56:40
-Field	39:32	PMG_MAX
-Res0	31:21
-Field	20:18	VPMR_MAX
-Field	17	HAS_HCR
-Res0	16
-Field	15:0	PARTID_MAX
-EndSysreg
-
 Sysreg	LORID_EL1	3	0	10	4	7
 Res0	63:24
 Field	23:16	LD
@@ -3205,22 +3189,6 @@ Res0	15:8
 Field	7:0	LR
 EndSysreg
 
-Sysreg	MPAM1_EL1	3	0	10	5	0
-Res0	63:48
-Field	47:40	PMG_D
-Field	39:32	PMG_I
-Field	31:16	PARTID_D
-Field	15:0	PARTID_I
-EndSysreg
-
-Sysreg	MPAM0_EL1	3	0	10	5	1
-Res0	63:48
-Field	47:40	PMG_D
-Field	39:32	PMG_I
-Field	31:16	PARTID_D
-Field	15:0	PARTID_I
-EndSysreg
-
 Sysreg	ISR_EL1	3	0	12	1	0
 Res0	63:11
 Field	10	IS
@@ -3234,7 +3202,6 @@ EndSysreg
 Sysreg	ICC_NMIAR1_EL1	3	0	12	9	5
 Res0	63:24
 Field	23:0	INTID
-
 EndSysreg
 
 Sysreg	TRBLIMITR_EL1	3	0	9	11	0
-- 
Gitee


From 29644e974dae1f124b8e971e5106ce88ec4a6a48 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:49:27 -0800
Subject: [PATCH 125/280] anolis: Revert "arm64: head.S: Initialise MPAM EL2
 registers and disable traps"

ANBZ: #31045

This reverts commit 4ccbd4e8f883eb3f56e1ada8b067543d07d473dc.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/arm64/include/asm/el2_setup.h | 16 ----------------
 1 file changed, 16 deletions(-)

diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h
index d93c2b5b0b59..44336899ca27 100644
--- a/arch/arm64/include/asm/el2_setup.h
+++ b/arch/arm64/include/asm/el2_setup.h
@@ -274,21 +274,6 @@
 	msr	spsr_el2, x0
 .endm
 
-.macro __init_el2_mpam
-#ifdef CONFIG_ARM64_MPAM
-	/* Memory Partioning And Monitoring: disable EL2 traps */
-	mrs	x1, id_aa64pfr0_el1
-	ubfx	x0, x1, #ID_AA64PFR0_EL1_MPAM_SHIFT, #4
-	cbz	x0, .Lskip_mpam_\@		// skip if no MPAM
-	msr_s	SYS_MPAM2_EL2, xzr		// use the default partition
-						// and disable lower traps
-	mrs_s	x0, SYS_MPAMIDR_EL1
-	tbz	x0, #17, .Lskip_mpam_\@		// skip if no MPAMHCR reg
-	msr_s	SYS_MPAMHCR_EL2, xzr		// clear TRAP_MPAMIDR_EL1 -> EL2
-.Lskip_mpam_\@:
-#endif /* CONFIG_ARM64_MPAM */
-.endm
-
 /**
  * Initialize EL2 registers to sane values. This should be called early on all
  * cores that were booted in EL2. Note that everything gets initialised as
@@ -307,7 +292,6 @@
 	__init_el2_stage2
 	__init_el2_gicv3
 	__init_el2_hstr
-	__init_el2_mpam
 	__init_el2_nvhe_idregs
 	__init_el2_cptr
 	__init_el2_fgt
-- 
Gitee


From bd3824401bd8343ab4d0557f740050ca198976af Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:16 -0800
Subject: [PATCH 126/280] anolis: Revert "x86/resctrl: Move the resctrl
 filesystem code to /fs/resctrl"

ANBZ: #31045

This reverts commit c7d51b50e13f5e409032cc3d60d038286802e6c1.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        |   15 +
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  510 +++
 arch/x86/kernel/cpu/resctrl/internal.h    |  310 ++
 arch/x86/kernel/cpu/resctrl/monitor.c     |  821 ++++
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 1093 ++++++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 4284 ++++++++++++++++++++-
 fs/resctrl/ctrlmondata.c                  |  532 ---
 fs/resctrl/internal.h                     |  340 --
 fs/resctrl/monitor.c                      |  843 ----
 fs/resctrl/psuedo_lock.c                  | 1122 ------
 fs/resctrl/rdtgroup.c                     | 4013 -------------------
 11 files changed, 6888 insertions(+), 6995 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 51389ebc0f19..87cd508588e5 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -164,6 +164,21 @@ static inline void cache_alloc_hsw_probe(void)
 	rdt_alloc_capable = true;
 }
 
+bool is_mba_sc(struct rdt_resource *r)
+{
+	if (!r)
+		r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+
+	/*
+	 * The software controller support is only applicable to MBA resource.
+	 * Make sure to check for resource type.
+	 */
+	if (r->rid != RDT_RESOURCE_MBA)
+		return false;
+
+	return r->membw.mba_sc;
+}
+
 /*
  * rdt_get_mb_table() - get a mapping of bandwidth(b/w) percentage values
  * exposed to user interface and the h/w understandable delay values.
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index c5c3eaea27b6..4d91a8abb24d 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -23,6 +23,265 @@
 
 #include "internal.h"
 
+struct rdt_parse_data {
+	struct rdtgroup		*rdtgrp;
+	char			*buf;
+};
+
+typedef int (ctrlval_parser_t)(struct rdt_parse_data *data,
+			       struct resctrl_schema *s,
+			       struct rdt_domain *d);
+
+/*
+ * Check whether MBA bandwidth percentage value is correct. The value is
+ * checked against the minimum and max bandwidth values specified by the
+ * hardware. The allocated bandwidth percentage is rounded to the next
+ * control step available on the hardware.
+ */
+static bool bw_validate(char *buf, u32 *data, struct rdt_resource *r)
+{
+	int ret;
+	u32 bw;
+
+	/*
+	 * Only linear delay values is supported for current Intel SKUs.
+	 */
+	if (!r->membw.delay_linear && r->membw.arch_needs_linear) {
+		rdt_last_cmd_puts("No support for non-linear MB domains\n");
+		return false;
+	}
+
+	ret = kstrtou32(buf, 10, &bw);
+	if (ret) {
+		rdt_last_cmd_printf("Invalid MB value %s\n", buf);
+		return false;
+	}
+
+	/* Nothing else to do if software controller is enabled. */
+	if (is_mba_sc(r)) {
+		*data = bw;
+		return true;
+	}
+
+	if (bw < r->membw.min_bw || bw > r->default_ctrl) {
+		rdt_last_cmd_printf("MB value %u out of range [%d,%d]\n",
+				    bw, r->membw.min_bw, r->default_ctrl);
+		return false;
+	}
+
+	*data = roundup(bw, (unsigned long)r->membw.bw_gran);
+	return true;
+}
+
+static int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
+		    struct rdt_domain *d)
+{
+	struct resctrl_staged_config *cfg;
+	u32 closid = data->rdtgrp->closid;
+	struct rdt_resource *r = s->res;
+	u32 bw_val;
+
+	cfg = &d->staged_config[s->conf_type];
+	if (cfg->have_new_ctrl) {
+		rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
+		return -EINVAL;
+	}
+
+	if (!bw_validate(data->buf, &bw_val, r))
+		return -EINVAL;
+
+	if (is_mba_sc(r)) {
+		d->mbps_val[closid] = bw_val;
+		return 0;
+	}
+
+	cfg->new_ctrl = bw_val;
+	cfg->have_new_ctrl = true;
+
+	return 0;
+}
+
+/*
+ * Check whether a cache bit mask is valid.
+ * On Intel CPUs, non-contiguous 1s value support is indicated by CPUID:
+ *   - CPUID.0x10.1:ECX[3]: L3 non-contiguous 1s value supported if 1
+ *   - CPUID.0x10.2:ECX[3]: L2 non-contiguous 1s value supported if 1
+ *
+ * Haswell does not support a non-contiguous 1s value and additionally
+ * requires at least two bits set.
+ * AMD allows non-contiguous bitmasks.
+ */
+static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
+{
+	unsigned long first_bit, zero_bit, val;
+	unsigned int cbm_len = r->cache.cbm_len;
+	int ret;
+
+	ret = kstrtoul(buf, 16, &val);
+	if (ret) {
+		rdt_last_cmd_printf("Non-hex character in the mask %s\n", buf);
+		return false;
+	}
+
+	if ((r->cache.min_cbm_bits > 0 && val == 0) || val > r->default_ctrl) {
+		rdt_last_cmd_puts("Mask out of range\n");
+		return false;
+	}
+
+	first_bit = find_first_bit(&val, cbm_len);
+	zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
+
+	/* Are non-contiguous bitmasks allowed? */
+	if (!r->cache.arch_has_sparse_bitmasks &&
+	    (find_next_bit(&val, cbm_len, zero_bit) < cbm_len)) {
+		rdt_last_cmd_printf("The mask %lx has non-consecutive 1-bits\n", val);
+		return false;
+	}
+
+	if ((zero_bit - first_bit) < r->cache.min_cbm_bits) {
+		rdt_last_cmd_printf("Need at least %d bits in the mask\n",
+				    r->cache.min_cbm_bits);
+		return false;
+	}
+
+	*data = val;
+	return true;
+}
+
+/*
+ * Read one cache bit mask (hex). Check that it is valid for the current
+ * resource type.
+ */
+static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
+		     struct rdt_domain *d)
+{
+	struct rdtgroup *rdtgrp = data->rdtgrp;
+	struct resctrl_staged_config *cfg;
+	struct rdt_resource *r = s->res;
+	u32 cbm_val;
+
+	cfg = &d->staged_config[s->conf_type];
+	if (cfg->have_new_ctrl) {
+		rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
+		return -EINVAL;
+	}
+
+	/*
+	 * Cannot set up more than one pseudo-locked region in a cache
+	 * hierarchy.
+	 */
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
+	    rdtgroup_pseudo_locked_in_hierarchy(d)) {
+		rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
+		return -EINVAL;
+	}
+
+	if (!cbm_validate(data->buf, &cbm_val, r))
+		return -EINVAL;
+
+	if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
+	     rdtgrp->mode == RDT_MODE_SHAREABLE) &&
+	    rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
+		rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * The CBM may not overlap with the CBM of another closid if
+	 * either is exclusive.
+	 */
+	if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, true)) {
+		rdt_last_cmd_puts("Overlaps with exclusive group\n");
+		return -EINVAL;
+	}
+
+	if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, false)) {
+		if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
+		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+			rdt_last_cmd_puts("Overlaps with other group\n");
+			return -EINVAL;
+		}
+	}
+
+	cfg->new_ctrl = cbm_val;
+	cfg->have_new_ctrl = true;
+
+	return 0;
+}
+
+static ctrlval_parser_t *get_parser(struct rdt_resource *res)
+{
+	if (res->fflags & RFTYPE_RES_CACHE)
+		return &parse_cbm;
+	else
+		return &parse_bw;
+}
+
+/*
+ * For each domain in this resource we expect to find a series of:
+ *	id=mask
+ * separated by ";". The "id" is in decimal, and must match one of
+ * the "id"s for this resource.
+ */
+static int parse_line(char *line, struct resctrl_schema *s,
+		      struct rdtgroup *rdtgrp)
+{
+	ctrlval_parser_t *parse_ctrlval = get_parser(s->res);
+	enum resctrl_conf_type t = s->conf_type;
+	struct resctrl_staged_config *cfg;
+	struct rdt_resource *r = s->res;
+	struct rdt_parse_data data;
+	char *dom = NULL, *id;
+	struct rdt_domain *d;
+	unsigned long dom_id;
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
+	    (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)) {
+		rdt_last_cmd_puts("Cannot pseudo-lock MBA resource\n");
+		return -EINVAL;
+	}
+
+next:
+	if (!line || line[0] == '\0')
+		return 0;
+	dom = strsep(&line, ";");
+	id = strsep(&dom, "=");
+	if (!dom || kstrtoul(id, 10, &dom_id)) {
+		rdt_last_cmd_puts("Missing '=' or non-numeric domain\n");
+		return -EINVAL;
+	}
+	dom = strim(dom);
+	list_for_each_entry(d, &r->domains, list) {
+		if (d->id == dom_id) {
+			data.buf = dom;
+			data.rdtgrp = rdtgrp;
+			if (parse_ctrlval(&data, s, d))
+				return -EINVAL;
+			if (rdtgrp->mode ==  RDT_MODE_PSEUDO_LOCKSETUP) {
+				cfg = &d->staged_config[t];
+				/*
+				 * In pseudo-locking setup mode and just
+				 * parsed a valid CBM that should be
+				 * pseudo-locked. Only one locked region per
+				 * resource group and domain so just do
+				 * the required initialization for single
+				 * region and return.
+				 */
+				rdtgrp->plr->s = s;
+				rdtgrp->plr->d = d;
+				rdtgrp->plr->cbm = cfg->new_ctrl;
+				d->plr = rdtgrp->plr;
+				return 0;
+			}
+			goto next;
+		}
+	}
+	return -EINVAL;
+}
+
 static bool apply_config(struct rdt_hw_domain *hw_dom,
 			 struct resctrl_staged_config *cfg, u32 idx,
 			 cpumask_var_t cpu_mask)
@@ -111,6 +370,100 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 	return 0;
 }
 
+static int rdtgroup_parse_resource(char *resname, char *tok,
+				   struct rdtgroup *rdtgrp)
+{
+	struct resctrl_schema *s;
+
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		if (!strcmp(resname, s->name) && rdtgrp->closid < s->num_closid)
+			return parse_line(tok, s, rdtgrp);
+	}
+	rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
+	return -EINVAL;
+}
+
+ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
+				char *buf, size_t nbytes, loff_t off)
+{
+	struct resctrl_schema *s;
+	struct rdtgroup *rdtgrp;
+	struct rdt_resource *r;
+	char *tok, *resname;
+	int ret = 0;
+
+	/* Valid input requires a trailing newline */
+	if (nbytes == 0 || buf[nbytes - 1] != '\n')
+		return -EINVAL;
+	buf[nbytes - 1] = '\0';
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		rdtgroup_kn_unlock(of->kn);
+		return -ENOENT;
+	}
+	rdt_last_cmd_clear();
+
+	/*
+	 * No changes to pseudo-locked region allowed. It has to be removed
+	 * and re-created instead.
+	 */
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+		ret = -EINVAL;
+		rdt_last_cmd_puts("Resource group is pseudo-locked\n");
+		goto out;
+	}
+
+	rdt_staged_configs_clear();
+
+	while ((tok = strsep(&buf, "\n")) != NULL) {
+		resname = strim(strsep(&tok, ":"));
+		if (!tok) {
+			rdt_last_cmd_puts("Missing ':'\n");
+			ret = -EINVAL;
+			goto out;
+		}
+		if (tok[0] == '\0') {
+			rdt_last_cmd_printf("Missing '%s' value\n", resname);
+			ret = -EINVAL;
+			goto out;
+		}
+		ret = rdtgroup_parse_resource(resname, tok, rdtgrp);
+		if (ret)
+			goto out;
+	}
+
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		r = s->res;
+
+		/*
+		 * Writes to mba_sc resources update the software controller,
+		 * not the control MSR.
+		 */
+		if (is_mba_sc(r))
+			continue;
+
+		ret = resctrl_arch_update_domains(r, rdtgrp->closid);
+		if (ret)
+			goto out;
+	}
+
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+		/*
+		 * If pseudo-locking fails we keep the resource group in
+		 * mode RDT_MODE_PSEUDO_LOCKSETUP with its class of service
+		 * active and updated for just the domain the pseudo-locked
+		 * region was requested for.
+		 */
+		ret = rdtgroup_pseudo_lock_create(rdtgrp);
+	}
+
+out:
+	rdt_staged_configs_clear();
+	rdtgroup_kn_unlock(of->kn);
+	return ret ?: nbytes;
+}
+
 u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
 			    u32 closid, enum resctrl_conf_type type)
 {
@@ -119,3 +472,160 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
 
 	return hw_dom->ctrl_val[idx];
 }
+
+static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
+{
+	struct rdt_resource *r = schema->res;
+	struct rdt_domain *dom;
+	bool sep = false;
+	u32 ctrl_val;
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	seq_printf(s, "%*s:", max_name_width, schema->name);
+	list_for_each_entry(dom, &r->domains, list) {
+		if (sep)
+			seq_puts(s, ";");
+
+		if (is_mba_sc(r))
+			ctrl_val = dom->mbps_val[closid];
+		else
+			ctrl_val = resctrl_arch_get_config(r, dom, closid,
+							   schema->conf_type);
+
+		seq_printf(s, r->format_str, dom->id, max_data_width,
+			   ctrl_val);
+		sep = true;
+	}
+	seq_puts(s, "\n");
+}
+
+int rdtgroup_schemata_show(struct kernfs_open_file *of,
+			   struct seq_file *s, void *v)
+{
+	struct resctrl_schema *schema;
+	struct rdtgroup *rdtgrp;
+	int ret = 0;
+	u32 closid;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (rdtgrp) {
+		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+			list_for_each_entry(schema, &resctrl_schema_all, list) {
+				seq_printf(s, "%s:uninitialized\n", schema->name);
+			}
+		} else if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+			if (!rdtgrp->plr->d) {
+				rdt_last_cmd_clear();
+				rdt_last_cmd_puts("Cache domain offline\n");
+				ret = -ENODEV;
+			} else {
+				seq_printf(s, "%s:%d=%x\n",
+					   rdtgrp->plr->s->res->name,
+					   rdtgrp->plr->d->id,
+					   rdtgrp->plr->cbm);
+			}
+		} else {
+			closid = rdtgrp->closid;
+			list_for_each_entry(schema, &resctrl_schema_all, list) {
+				if (closid < schema->num_closid)
+					show_doms(s, schema, closid);
+			}
+		}
+	} else {
+		ret = -ENOENT;
+	}
+	rdtgroup_kn_unlock(of->kn);
+	return ret;
+}
+
+static int smp_mon_event_count(void *arg)
+{
+	mon_event_count(arg);
+
+	return 0;
+}
+
+void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
+		    struct rdt_domain *d, struct rdtgroup *rdtgrp,
+		    int evtid, int first)
+{
+	int cpu;
+
+	/* When picking a CPU from cpu_mask, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	/*
+	 * Setup the parameters to pass to mon_event_count() to read the data.
+	 */
+	rr->rgrp = rdtgrp;
+	rr->evtid = evtid;
+	rr->r = r;
+	rr->d = d;
+	rr->val = 0;
+	rr->first = first;
+	rr->arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, evtid);
+	if (IS_ERR(rr->arch_mon_ctx)) {
+		rr->err = -EINVAL;
+		return;
+	}
+
+	cpu = cpumask_any_housekeeping(&d->cpu_mask, RESCTRL_PICK_ANY_CPU);
+
+	/*
+	 * cpumask_any_housekeeping() prefers housekeeping CPUs, but
+	 * are all the CPUs nohz_full? If yes, pick a CPU to IPI.
+	 * MPAM's resctrl_arch_rmid_read() is unable to read the
+	 * counters on some platforms if its called in IRQ context.
+	 */
+	if (tick_nohz_full_cpu(cpu))
+		smp_call_function_any(&d->cpu_mask, mon_event_count, rr, 1);
+	else
+		smp_call_on_cpu(cpu, smp_mon_event_count, rr, false);
+
+	resctrl_arch_mon_ctx_free(r, evtid, rr->arch_mon_ctx);
+}
+
+int rdtgroup_mondata_show(struct seq_file *m, void *arg)
+{
+	struct kernfs_open_file *of = m->private;
+	u32 resid, evtid, domid;
+	struct rdtgroup *rdtgrp;
+	struct rdt_resource *r;
+	union mon_data_bits md;
+	struct rdt_domain *d;
+	struct rmid_read rr;
+	int ret = 0;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	md.priv = of->kn->priv;
+	resid = md.u.rid;
+	domid = md.u.domid;
+	evtid = md.u.evtid;
+
+	r = resctrl_arch_get_resource(resid);
+	d = resctrl_arch_find_domain(r, domid);
+	if (IS_ERR_OR_NULL(d)) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	mon_event_read(&rr, r, d, rdtgrp, evtid, false);
+
+	if (rr.err == -EIO)
+		seq_puts(m, "Error\n");
+	else if (rr.err == -EINVAL)
+		seq_puts(m, "Unavailable\n");
+	else
+		seq_printf(m, "%llu\n", rr.val);
+
+out:
+	rdtgroup_kn_unlock(of->kn);
+	return ret;
+}
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index bf3538992667..0f7e3f10941b 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -26,6 +26,227 @@
  */
 #define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)
 
+/**
+ * cpumask_any_housekeeping() - Choose any CPU in @mask, preferring those that
+ *			        aren't marked nohz_full
+ * @mask:	The mask to pick a CPU from.
+ * @exclude_cpu:The CPU to avoid picking.
+ *
+ * Returns a CPU from @mask, but not @exclude_cpu. If there are housekeeping
+ * CPUs that don't use nohz_full, these are preferred. Pass
+ * RESCTRL_PICK_ANY_CPU to avoid excluding any CPUs.
+ *
+ * When a CPU is excluded, returns >= nr_cpu_ids if no CPUs are available.
+ */
+static inline unsigned int
+cpumask_any_housekeeping(const struct cpumask *mask, int exclude_cpu)
+{
+	unsigned int cpu, hk_cpu;
+
+	if (exclude_cpu == RESCTRL_PICK_ANY_CPU)
+		cpu = cpumask_any(mask);
+	else
+		cpu = cpumask_any_but(mask, exclude_cpu);
+
+	if (!IS_ENABLED(CONFIG_NO_HZ_FULL))
+		return cpu;
+
+	/* If the CPU picked isn't marked nohz_full nothing more needs doing. */
+	if (cpu < nr_cpu_ids && !tick_nohz_full_cpu(cpu))
+		return cpu;
+
+	/* Try to find a CPU that isn't nohz_full to use in preference */
+	hk_cpu = cpumask_nth_andnot(0, mask, tick_nohz_full_mask);
+	if (hk_cpu == exclude_cpu)
+		hk_cpu = cpumask_nth_andnot(1, mask, tick_nohz_full_mask);
+
+	if (hk_cpu < nr_cpu_ids)
+		cpu = hk_cpu;
+
+	return cpu;
+}
+
+struct rdt_fs_context {
+	struct kernfs_fs_context	kfc;
+	bool				enable_cdpl2;
+	bool				enable_cdpl3;
+	bool				enable_mba_mbps;
+	bool				enable_debug;
+};
+
+static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
+{
+	struct kernfs_fs_context *kfc = fc->fs_private;
+
+	return container_of(kfc, struct rdt_fs_context, kfc);
+}
+
+/**
+ * struct mon_evt - Entry in the event list of a resource
+ * @evtid:		event id
+ * @name:		name of the event
+ * @configurable:	true if the event is configurable
+ * @list:		entry in &rdt_resource->evt_list
+ */
+struct mon_evt {
+	enum resctrl_event_id	evtid;
+	char			*name;
+	bool			configurable;
+	struct list_head	list;
+};
+
+/**
+ * union mon_data_bits - Monitoring details for each event file
+ * @priv:              Used to store monitoring event data in @u
+ *                     as kernfs private data
+ * @rid:               Resource id associated with the event file
+ * @evtid:             Event id associated with the event file
+ * @domid:             The domain to which the event file belongs
+ * @u:                 Name of the bit fields struct
+ */
+union mon_data_bits {
+	void *priv;
+	struct {
+		unsigned int rid		: 10;
+		enum resctrl_event_id evtid	: 8;
+		unsigned int domid		: 14;
+	} u;
+};
+
+struct rmid_read {
+	struct rdtgroup		*rgrp;
+	struct rdt_resource	*r;
+	struct rdt_domain	*d;
+	enum resctrl_event_id	evtid;
+	bool			first;
+	int			err;
+	u64			val;
+	void			*arch_mon_ctx;
+};
+
+extern struct list_head resctrl_schema_all;
+extern bool resctrl_mounted;
+
+enum rdt_group_type {
+	RDTCTRL_GROUP = 0,
+	RDTMON_GROUP,
+	RDT_NUM_GROUP,
+};
+
+/**
+ * enum rdtgrp_mode - Mode of a RDT resource group
+ * @RDT_MODE_SHAREABLE: This resource group allows sharing of its allocations
+ * @RDT_MODE_EXCLUSIVE: No sharing of this resource group's allocations allowed
+ * @RDT_MODE_PSEUDO_LOCKSETUP: Resource group will be used for Pseudo-Locking
+ * @RDT_MODE_PSEUDO_LOCKED: No sharing of this resource group's allocations
+ *                          allowed AND the allocations are Cache Pseudo-Locked
+ * @RDT_NUM_MODES: Total number of modes
+ *
+ * The mode of a resource group enables control over the allowed overlap
+ * between allocations associated with different resource groups (classes
+ * of service). User is able to modify the mode of a resource group by
+ * writing to the "mode" resctrl file associated with the resource group.
+ *
+ * The "shareable", "exclusive", and "pseudo-locksetup" modes are set by
+ * writing the appropriate text to the "mode" file. A resource group enters
+ * "pseudo-locked" mode after the schemata is written while the resource
+ * group is in "pseudo-locksetup" mode.
+ */
+enum rdtgrp_mode {
+	RDT_MODE_SHAREABLE = 0,
+	RDT_MODE_EXCLUSIVE,
+	RDT_MODE_PSEUDO_LOCKSETUP,
+	RDT_MODE_PSEUDO_LOCKED,
+
+	/* Must be last */
+	RDT_NUM_MODES,
+};
+
+/**
+ * struct mongroup - store mon group's data in resctrl fs.
+ * @mon_data_kn:		kernfs node for the mon_data directory
+ * @parent:			parent rdtgrp
+ * @crdtgrp_list:		child rdtgroup node list
+ * @rmid:			rmid for this rdtgroup
+ */
+struct mongroup {
+	struct kernfs_node	*mon_data_kn;
+	struct rdtgroup		*parent;
+	struct list_head	crdtgrp_list;
+	u32			rmid;
+};
+
+/**
+ * struct rdtgroup - store rdtgroup's data in resctrl file system.
+ * @kn:				kernfs node
+ * @rdtgroup_list:		linked list for all rdtgroups
+ * @closid:			closid for this rdtgroup
+ * @cpu_mask:			CPUs assigned to this rdtgroup
+ * @flags:			status bits
+ * @waitcount:			how many cpus expect to find this
+ *				group when they acquire rdtgroup_mutex
+ * @type:			indicates type of this rdtgroup - either
+ *				monitor only or ctrl_mon group
+ * @mon:			mongroup related data
+ * @mode:			mode of resource group
+ * @plr:			pseudo-locked region
+ */
+struct rdtgroup {
+	struct kernfs_node		*kn;
+	struct list_head		rdtgroup_list;
+	u32				closid;
+	struct cpumask			cpu_mask;
+	int				flags;
+	atomic_t			waitcount;
+	enum rdt_group_type		type;
+	struct mongroup			mon;
+	enum rdtgrp_mode		mode;
+	struct pseudo_lock_region	*plr;
+};
+
+/* List of all resource groups */
+extern struct list_head rdt_all_groups;
+
+extern int max_name_width, max_data_width;
+
+/**
+ * struct rftype - describe each file in the resctrl file system
+ * @name:	File name
+ * @mode:	Access mode
+ * @kf_ops:	File operations
+ * @flags:	File specific RFTYPE_FLAGS_* flags
+ * @fflags:	File specific RFTYPE_* flags
+ * @seq_show:	Show content of the file
+ * @write:	Write to the file
+ */
+struct rftype {
+	char			*name;
+	umode_t			mode;
+	const struct kernfs_ops	*kf_ops;
+	unsigned long		flags;
+	unsigned long		fflags;
+
+	int (*seq_show)(struct kernfs_open_file *of,
+			struct seq_file *sf, void *v);
+	/*
+	 * write() is the generic write callback which maps directly to
+	 * kernfs write operation and overrides all other operations.
+	 * Maximum write size is determined by ->max_write_len.
+	 */
+	ssize_t (*write)(struct kernfs_open_file *of,
+			 char *buf, size_t nbytes, loff_t off);
+};
+
+/**
+ * struct mbm_state - status for each MBM counter in each domain
+ * @prev_bw_bytes: Previous bytes value read for bandwidth calculation
+ * @prev_bw:	The most recent bandwidth in MBps
+ */
+struct mbm_state {
+	u64	prev_bw_bytes;
+	u32	prev_bw;
+};
+
 /**
  * struct arch_mbm_state - values used to compute resctrl_arch_rmid_read()s
  *			   return value.
@@ -106,7 +327,11 @@ static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r
 	return container_of(r, struct rdt_hw_resource, r_resctrl);
 }
 
+extern struct mutex rdtgroup_mutex;
+
 extern struct rdt_hw_resource rdt_resources_all[];
+extern struct rdtgroup rdtgroup_default;
+extern struct dentry *debugfs_resctrl;
 
 static inline struct rdt_resource *resctrl_inc(struct rdt_resource *res)
 {
@@ -170,10 +395,95 @@ union cpuid_0x10_x_edx {
 	unsigned int full;
 };
 
+void rdt_last_cmd_clear(void);
+void rdt_last_cmd_puts(const char *s);
+__printf(1, 2)
+void rdt_last_cmd_printf(const char *fmt, ...);
+
 void rdt_ctrl_update(void *arg);
+struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn);
+void rdtgroup_kn_unlock(struct kernfs_node *kn);
+int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name);
+int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
+			     umode_t mask);
+ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
+				char *buf, size_t nbytes, loff_t off);
+int rdtgroup_schemata_show(struct kernfs_open_file *of,
+			   struct seq_file *s, void *v);
+bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
+			   unsigned long cbm, int closid, bool exclusive);
+unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_domain *d,
+				  unsigned long cbm);
+enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
+int rdtgroup_tasks_assigned(struct rdtgroup *r);
+int closids_supported(void);
+void closid_free(int closid);
+int alloc_rmid(u32 closid);
+void free_rmid(u32 closid, u32 rmid);
 int rdt_get_mon_l3_config(struct rdt_resource *r);
+void resctrl_mon_resource_exit(void);
 bool rdt_cpu_has(int flag);
+void mon_event_count(void *info);
+int rdtgroup_mondata_show(struct seq_file *m, void *arg);
+void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
+		    struct rdt_domain *d, struct rdtgroup *rdtgrp,
+		    int evtid, int first);
+int resctrl_mon_resource_init(void);
+void mbm_setup_overflow_handler(struct rdt_domain *dom,
+				unsigned long delay_ms,
+				int exclude_cpu);
+void mbm_handle_overflow(struct work_struct *work);
 void __init intel_rdt_mbm_apply_quirk(void);
+bool is_mba_sc(struct rdt_resource *r);
+void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms,
+			     int exclude_cpu);
+void cqm_handle_limbo(struct work_struct *work);
+bool has_busy_rmid(struct rdt_domain *d);
+void __check_limbo(struct rdt_domain *d, bool force_free);
 void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
+void mbm_config_rftype_init(const char *config);
+void rdt_staged_configs_clear(void);
+bool closid_allocated(unsigned int closid);
+int resctrl_find_cleanest_closid(void);
+
+#ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
+int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
+int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp);
+bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm);
+bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d);
+int rdt_pseudo_lock_init(void);
+void rdt_pseudo_lock_release(void);
+int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
+void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
+#else
+static inline int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm)
+{
+	return false;
+}
+
+static inline bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
+{
+	return false;
+}
+
+static inline int rdt_pseudo_lock_init(void) { return 0; }
+static inline void rdt_pseudo_lock_release(void) { }
+static inline int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp) { }
+#endif /* CONFIG_RESCTRL_FS_PSEUDO_LOCK */
 
 #endif /* _ASM_X86_RESCTRL_INTERNAL_H */
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 02fb9d87479a..7e6fca138cb7 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -25,6 +25,53 @@
 
 #include "internal.h"
 
+/**
+ * struct rmid_entry - dirty tracking for all RMID.
+ * @closid:	The CLOSID for this entry.
+ * @rmid:	The RMID for this entry.
+ * @busy:	The number of domains with cached data using this RMID.
+ * @list:	Member of the rmid_free_lru list when busy == 0.
+ *
+ * Depending on the architecture the correct monitor is accessed using
+ * both @closid and @rmid, or @rmid only.
+ *
+ * Take the rdtgroup_mutex when accessing.
+ */
+struct rmid_entry {
+	u32				closid;
+	u32				rmid;
+	int				busy;
+	struct list_head		list;
+};
+
+/*
+ * @rmid_free_lru - A least recently used list of free RMIDs
+ *     These RMIDs are guaranteed to have an occupancy less than the
+ *     threshold occupancy
+ */
+static LIST_HEAD(rmid_free_lru);
+
+/*
+ * @closid_num_dirty_rmid    The number of dirty RMID each CLOSID has.
+ *     Only allocated when CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID is defined.
+ *     Indexed by CLOSID. Protected by rdtgroup_mutex.
+ */
+static u32 *closid_num_dirty_rmid;
+
+/*
+ * @rmid_limbo_count - count of currently unused but (potentially)
+ *     dirty RMIDs.
+ *     This counts RMIDs that no one is currently using but that
+ *     may have a occupancy value > resctrl_rmid_realloc_threshold. User can
+ *     change the threshold occupancy value.
+ */
+static unsigned int rmid_limbo_count;
+
+/*
+ * @rmid_entry - The entry in the limbo and free lists.
+ */
+static struct rmid_entry	*rmid_ptrs;
+
 /*
  * Global boolean for rdt_monitor which is true if any
  * resource monitoring is enabled.
@@ -36,6 +83,17 @@ bool rdt_mon_capable;
  */
 unsigned int rdt_mon_features;
 
+/*
+ * This is the threshold cache occupancy in bytes at which we will consider an
+ * RMID available for re-allocation.
+ */
+unsigned int resctrl_rmid_realloc_threshold;
+
+/*
+ * This is the maximum value for the reallocation threshold, in bytes.
+ */
+unsigned int resctrl_rmid_realloc_limit;
+
 #define CF(cf)	((unsigned long)(1048576 * (cf) + 0.5))
 
 /*
@@ -99,6 +157,33 @@ static inline u64 get_corrected_mbm_count(u32 rmid, unsigned long val)
 	return val;
 }
 
+/*
+ * x86 and arm64 differ in their handling of monitoring.
+ * x86's RMID are independent numbers, there is only one source of traffic
+ * with an RMID value of '1'.
+ * arm64's PMG extends the PARTID/CLOSID space, there are multiple sources of
+ * traffic with a PMG value of '1', one for each CLOSID, meaning the RMID
+ * value is no longer unique.
+ * To account for this, resctrl uses an index. On x86 this is just the RMID,
+ * on arm64 it encodes the CLOSID and RMID. This gives a unique number.
+ *
+ * The domain's rmid_busy_llc and rmid_ptrs[] are sized by index. The arch code
+ * must accept an attempt to read every index.
+ */
+static inline struct rmid_entry *__rmid_entry(u32 idx)
+{
+	struct rmid_entry *entry;
+	u32 closid, rmid;
+
+	entry = &rmid_ptrs[idx];
+	resctrl_arch_rmid_idx_decode(idx, &closid, &rmid);
+
+	WARN_ON_ONCE(entry->closid != closid);
+	WARN_ON_ONCE(entry->rmid != rmid);
+
+	return entry;
+}
+
 static int __rmid_read(u32 rmid, enum resctrl_event_id eventid, u64 *val)
 {
 	u64 msr_val;
@@ -217,6 +302,735 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
 	return 0;
 }
 
+static void limbo_release_entry(struct rmid_entry *entry)
+{
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	rmid_limbo_count--;
+	list_add_tail(&entry->list, &rmid_free_lru);
+
+	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
+		closid_num_dirty_rmid[entry->closid]--;
+}
+
+/*
+ * Check the RMIDs that are marked as busy for this domain. If the
+ * reported LLC occupancy is below the threshold clear the busy bit and
+ * decrement the count. If the busy count gets to zero on an RMID, we
+ * free the RMID
+ */
+void __check_limbo(struct rdt_domain *d, bool force_free)
+{
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
+	struct rmid_entry *entry;
+	u32 idx, cur_idx = 1;
+	void *arch_mon_ctx;
+	bool rmid_dirty;
+	u64 val = 0;
+
+	arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, QOS_L3_OCCUP_EVENT_ID);
+	if (IS_ERR(arch_mon_ctx)) {
+		pr_warn_ratelimited("Failed to allocate monitor context: %ld",
+				    PTR_ERR(arch_mon_ctx));
+		return;
+	}
+
+	/*
+	 * Skip RMID 0 and start from RMID 1 and check all the RMIDs that
+	 * are marked as busy for occupancy < threshold. If the occupancy
+	 * is less than the threshold decrement the busy counter of the
+	 * RMID and move it to the free list when the counter reaches 0.
+	 */
+	for (;;) {
+		idx = find_next_bit(d->rmid_busy_llc, idx_limit, cur_idx);
+		if (idx >= idx_limit)
+			break;
+
+		entry = __rmid_entry(idx);
+		if (resctrl_arch_rmid_read(r, d, entry->closid, entry->rmid,
+					   QOS_L3_OCCUP_EVENT_ID, &val,
+					   arch_mon_ctx)) {
+			rmid_dirty = true;
+		} else {
+			rmid_dirty = (val >= resctrl_rmid_realloc_threshold);
+		}
+
+		if (force_free || !rmid_dirty) {
+			clear_bit(idx, d->rmid_busy_llc);
+			if (!--entry->busy)
+				limbo_release_entry(entry);
+		}
+		cur_idx = idx + 1;
+	}
+
+	resctrl_arch_mon_ctx_free(r, QOS_L3_OCCUP_EVENT_ID, arch_mon_ctx);
+}
+
+bool has_busy_rmid(struct rdt_domain *d)
+{
+	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
+
+	return find_first_bit(d->rmid_busy_llc, idx_limit) != idx_limit;
+}
+
+static struct rmid_entry *resctrl_find_free_rmid(u32 closid)
+{
+	struct rmid_entry *itr;
+	u32 itr_idx, cmp_idx;
+
+	if (list_empty(&rmid_free_lru))
+		return rmid_limbo_count ? ERR_PTR(-EBUSY) : ERR_PTR(-ENOSPC);
+
+	list_for_each_entry(itr, &rmid_free_lru, list) {
+		/*
+		 * Get the index of this free RMID, and the index it would need
+		 * to be if it were used with this CLOSID.
+		 * If the CLOSID is irrelevant on this architecture, the two
+		 * index values are always the same on every entry and thus the
+		 * very first entry will be returned.
+		 */
+		itr_idx = resctrl_arch_rmid_idx_encode(itr->closid, itr->rmid);
+		cmp_idx = resctrl_arch_rmid_idx_encode(closid, itr->rmid);
+
+		if (itr_idx == cmp_idx)
+			return itr;
+	}
+
+	return ERR_PTR(-ENOSPC);
+}
+
+/**
+ * resctrl_find_cleanest_closid() - Find a CLOSID where all the associated
+ *                                  RMID are clean, or the CLOSID that has
+ *                                  the most clean RMID.
+ *
+ * MPAM's equivalent of RMID are per-CLOSID, meaning a freshly allocated CLOSID
+ * may not be able to allocate clean RMID. To avoid this the allocator will
+ * choose the CLOSID with the most clean RMID.
+ *
+ * When the CLOSID and RMID are independent numbers, the first free CLOSID will
+ * be returned.
+ */
+int resctrl_find_cleanest_closid(void)
+{
+	u32 cleanest_closid = ~0;
+	int i = 0;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	if (!IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
+		return -EIO;
+
+	for (i = 0; i < closids_supported(); i++) {
+		int num_dirty;
+
+		if (closid_allocated(i))
+			continue;
+
+		num_dirty = closid_num_dirty_rmid[i];
+		if (num_dirty == 0)
+			return i;
+
+		if (cleanest_closid == ~0)
+			cleanest_closid = i;
+
+		if (num_dirty < closid_num_dirty_rmid[cleanest_closid])
+			cleanest_closid = i;
+	}
+
+	if (cleanest_closid == ~0)
+		return -ENOSPC;
+
+	return cleanest_closid;
+}
+
+/*
+ * For MPAM the RMID value is not unique, and has to be considered with
+ * the CLOSID. The (CLOSID, RMID) pair is allocated on all domains, which
+ * allows all domains to be managed by a single free list.
+ * Each domain also has a rmid_busy_llc to reduce the work of the limbo handler.
+ */
+int alloc_rmid(u32 closid)
+{
+	struct rmid_entry *entry;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	entry = resctrl_find_free_rmid(closid);
+	if (IS_ERR(entry))
+		return PTR_ERR(entry);
+
+	list_del(&entry->list);
+	return entry->rmid;
+}
+
+static void add_rmid_to_limbo(struct rmid_entry *entry)
+{
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	struct rdt_domain *d;
+	u32 idx;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	idx = resctrl_arch_rmid_idx_encode(entry->closid, entry->rmid);
+
+	entry->busy = 0;
+	list_for_each_entry(d, &r->domains, list) {
+		/*
+		 * For the first limbo RMID in the domain,
+		 * setup up the limbo worker.
+		 */
+		if (!has_busy_rmid(d))
+			cqm_setup_limbo_handler(d, CQM_LIMBOCHECK_INTERVAL,
+						RESCTRL_PICK_ANY_CPU);
+		set_bit(idx, d->rmid_busy_llc);
+		entry->busy++;
+	}
+
+	rmid_limbo_count++;
+	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
+		closid_num_dirty_rmid[entry->closid]++;
+}
+
+void free_rmid(u32 closid, u32 rmid)
+{
+	u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
+	struct rmid_entry *entry;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	/*
+	 * Do not allow the default rmid to be free'd. Comparing by index
+	 * allows architectures that ignore the closid parameter to avoid an
+	 * unnecessary check.
+	 */
+	if (idx == resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
+						RESCTRL_RESERVED_RMID))
+		return;
+
+	entry = __rmid_entry(idx);
+
+	if (resctrl_arch_is_llc_occupancy_enabled())
+		add_rmid_to_limbo(entry);
+	else
+		list_add_tail(&entry->list, &rmid_free_lru);
+}
+
+static struct mbm_state *get_mbm_state(struct rdt_domain *d, u32 closid,
+				       u32 rmid, enum resctrl_event_id evtid)
+{
+	u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
+
+	switch (evtid) {
+	case QOS_L3_MBM_TOTAL_EVENT_ID:
+		return &d->mbm_total[idx];
+	case QOS_L3_MBM_LOCAL_EVENT_ID:
+		return &d->mbm_local[idx];
+	default:
+		return NULL;
+	}
+}
+
+static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
+{
+	struct mbm_state *m;
+	u64 tval = 0;
+
+	if (rr->first) {
+		resctrl_arch_reset_rmid(rr->r, rr->d, closid, rmid, rr->evtid);
+		m = get_mbm_state(rr->d, closid, rmid, rr->evtid);
+		if (m)
+			memset(m, 0, sizeof(struct mbm_state));
+		return 0;
+	}
+
+	rr->err = resctrl_arch_rmid_read(rr->r, rr->d, closid, rmid, rr->evtid,
+					 &tval, rr->arch_mon_ctx);
+	if (rr->err)
+		return rr->err;
+
+	rr->val += tval;
+
+	return 0;
+}
+
+/*
+ * mbm_bw_count() - Update bw count from values previously read by
+ *		    __mon_event_count().
+ * @closid:	The closid used to identify the cached mbm_state.
+ * @rmid:	The rmid used to identify the cached mbm_state.
+ * @rr:		The struct rmid_read populated by __mon_event_count().
+ *
+ * Supporting function to calculate the memory bandwidth
+ * and delta bandwidth in MBps. The chunks value previously read by
+ * __mon_event_count() is compared with the chunks value from the previous
+ * invocation. This must be called once per second to maintain values in MBps.
+ */
+static void mbm_bw_count(u32 closid, u32 rmid, struct rmid_read *rr)
+{
+	u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
+	struct mbm_state *m = &rr->d->mbm_local[idx];
+	u64 cur_bw, bytes, cur_bytes;
+
+	cur_bytes = rr->val;
+	bytes = cur_bytes - m->prev_bw_bytes;
+	m->prev_bw_bytes = cur_bytes;
+
+	cur_bw = bytes / SZ_1M;
+
+	m->prev_bw = cur_bw;
+}
+
+/*
+ * This is scheduled by mon_event_read() to read the CQM/MBM counters
+ * on a domain.
+ */
+void mon_event_count(void *info)
+{
+	struct rdtgroup *rdtgrp, *entry;
+	struct rmid_read *rr = info;
+	struct list_head *head;
+	int ret;
+
+	rdtgrp = rr->rgrp;
+
+	ret = __mon_event_count(rdtgrp->closid, rdtgrp->mon.rmid, rr);
+
+	/*
+	 * For Ctrl groups read data from child monitor groups and
+	 * add them together. Count events which are read successfully.
+	 * Discard the rmid_read's reporting errors.
+	 */
+	head = &rdtgrp->mon.crdtgrp_list;
+
+	if (rdtgrp->type == RDTCTRL_GROUP) {
+		list_for_each_entry(entry, head, mon.crdtgrp_list) {
+			if (__mon_event_count(entry->closid, entry->mon.rmid,
+					      rr) == 0)
+				ret = 0;
+		}
+	}
+
+	/*
+	 * __mon_event_count() calls for newly created monitor groups may
+	 * report -EINVAL/Unavailable if the monitor hasn't seen any traffic.
+	 * Discard error if any of the monitor event reads succeeded.
+	 */
+	if (ret == 0)
+		rr->err = 0;
+}
+
+/*
+ * Feedback loop for MBA software controller (mba_sc)
+ *
+ * mba_sc is a feedback loop where we periodically read MBM counters and
+ * adjust the bandwidth percentage values via the IA32_MBA_THRTL_MSRs so
+ * that:
+ *
+ *   current bandwidth(cur_bw) < user specified bandwidth(user_bw)
+ *
+ * This uses the MBM counters to measure the bandwidth and MBA throttle
+ * MSRs to control the bandwidth for a particular rdtgrp. It builds on the
+ * fact that resctrl rdtgroups have both monitoring and control.
+ *
+ * The frequency of the checks is 1s and we just tag along the MBM overflow
+ * timer. Having 1s interval makes the calculation of bandwidth simpler.
+ *
+ * Although MBA's goal is to restrict the bandwidth to a maximum, there may
+ * be a need to increase the bandwidth to avoid unnecessarily restricting
+ * the L2 <-> L3 traffic.
+ *
+ * Since MBA controls the L2 external bandwidth where as MBM measures the
+ * L3 external bandwidth the following sequence could lead to such a
+ * situation.
+ *
+ * Consider an rdtgroup which had high L3 <-> memory traffic in initial
+ * phases -> mba_sc kicks in and reduced bandwidth percentage values -> but
+ * after some time rdtgroup has mostly L2 <-> L3 traffic.
+ *
+ * In this case we may restrict the rdtgroup's L2 <-> L3 traffic as its
+ * throttle MSRs already have low percentage values.  To avoid
+ * unnecessarily restricting such rdtgroups, we also increase the bandwidth.
+ */
+static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
+{
+	u32 closid, rmid, cur_msr_val, new_msr_val;
+	struct mbm_state *pmbm_data, *cmbm_data;
+	struct rdt_resource *r_mba;
+	struct rdt_domain *dom_mba;
+	u32 cur_bw, user_bw, idx;
+	struct list_head *head;
+	struct rdtgroup *entry;
+
+	if (!resctrl_arch_is_mbm_local_enabled())
+		return;
+
+	r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+
+	closid = rgrp->closid;
+	rmid = rgrp->mon.rmid;
+	idx = resctrl_arch_rmid_idx_encode(closid, rmid);
+	pmbm_data = &dom_mbm->mbm_local[idx];
+
+	dom_mba = resctrl_get_domain_from_cpu(smp_processor_id(), r_mba);
+	if (!dom_mba) {
+		pr_warn_once("Failure to get domain for MBA update\n");
+		return;
+	}
+
+	cur_bw = pmbm_data->prev_bw;
+	user_bw = dom_mba->mbps_val[closid];
+
+	/* MBA resource doesn't support CDP */
+	cur_msr_val = resctrl_arch_get_config(r_mba, dom_mba, closid, CDP_NONE);
+
+	/*
+	 * For Ctrl groups read data from child monitor groups.
+	 */
+	head = &rgrp->mon.crdtgrp_list;
+	list_for_each_entry(entry, head, mon.crdtgrp_list) {
+		cmbm_data = &dom_mbm->mbm_local[entry->mon.rmid];
+		cur_bw += cmbm_data->prev_bw;
+	}
+
+	/*
+	 * Scale up/down the bandwidth linearly for the ctrl group.  The
+	 * bandwidth step is the bandwidth granularity specified by the
+	 * hardware.
+	 * Always increase throttling if current bandwidth is above the
+	 * target set by user.
+	 * But avoid thrashing up and down on every poll by checking
+	 * whether a decrease in throttling is likely to push the group
+	 * back over target. E.g. if currently throttling to 30% of bandwidth
+	 * on a system with 10% granularity steps, check whether moving to
+	 * 40% would go past the limit by multiplying current bandwidth by
+	 * "(30 + 10) / 30".
+	 */
+	if (cur_msr_val > r_mba->membw.min_bw && user_bw < cur_bw) {
+		new_msr_val = cur_msr_val - r_mba->membw.bw_gran;
+	} else if (cur_msr_val < MAX_MBA_BW &&
+		   (user_bw > (cur_bw * (cur_msr_val + r_mba->membw.min_bw) / cur_msr_val))) {
+		new_msr_val = cur_msr_val + r_mba->membw.bw_gran;
+	} else {
+		return;
+	}
+
+	resctrl_arch_update_one(r_mba, dom_mba, closid, CDP_NONE, new_msr_val);
+}
+
+static void mbm_update(struct rdt_resource *r, struct rdt_domain *d,
+		       u32 closid, u32 rmid)
+{
+	struct rmid_read rr;
+
+	rr.first = false;
+	rr.r = r;
+	rr.d = d;
+
+	/*
+	 * This is protected from concurrent reads from user
+	 * as both the user and we hold the global mutex.
+	 */
+	if (resctrl_arch_is_mbm_total_enabled()) {
+		rr.evtid = QOS_L3_MBM_TOTAL_EVENT_ID;
+		rr.val = 0;
+		rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
+		if (IS_ERR(rr.arch_mon_ctx)) {
+			pr_warn_ratelimited("Failed to allocate monitor context: %ld",
+					    PTR_ERR(rr.arch_mon_ctx));
+			return;
+		}
+
+		__mon_event_count(closid, rmid, &rr);
+
+		resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
+	}
+	if (resctrl_arch_is_mbm_local_enabled()) {
+		rr.evtid = QOS_L3_MBM_LOCAL_EVENT_ID;
+		rr.val = 0;
+		rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
+		if (IS_ERR(rr.arch_mon_ctx)) {
+			pr_warn_ratelimited("Failed to allocate monitor context: %ld",
+					    PTR_ERR(rr.arch_mon_ctx));
+			return;
+		}
+
+		__mon_event_count(closid, rmid, &rr);
+
+		/*
+		 * Call the MBA software controller only for the
+		 * control groups and when user has enabled
+		 * the software controller explicitly.
+		 */
+		if (is_mba_sc(NULL))
+			mbm_bw_count(closid, rmid, &rr);
+
+		resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
+	}
+}
+
+/*
+ * Handler to scan the limbo list and move the RMIDs
+ * to free list whose occupancy < threshold_occupancy.
+ */
+void cqm_handle_limbo(struct work_struct *work)
+{
+	unsigned long delay = msecs_to_jiffies(CQM_LIMBOCHECK_INTERVAL);
+	struct rdt_domain *d;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	d = container_of(work, struct rdt_domain, cqm_limbo.work);
+
+	__check_limbo(d, false);
+
+	if (has_busy_rmid(d)) {
+		d->cqm_work_cpu = cpumask_any_housekeeping(&d->cpu_mask,
+							   RESCTRL_PICK_ANY_CPU);
+		schedule_delayed_work_on(d->cqm_work_cpu, &d->cqm_limbo,
+					 delay);
+	}
+
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+}
+
+/**
+ * cqm_setup_limbo_handler() - Schedule the limbo handler to run for this
+ *                             domain.
+ * @dom:           The domain the limbo handler should run for.
+ * @delay_ms:      How far in the future the handler should run.
+ * @exclude_cpu:   Which CPU the handler should not run on,
+ *		   RESCTRL_PICK_ANY_CPU to pick any CPU.
+ */
+void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms,
+			     int exclude_cpu)
+{
+	unsigned long delay = msecs_to_jiffies(delay_ms);
+	int cpu;
+
+	cpu = cpumask_any_housekeeping(&dom->cpu_mask, exclude_cpu);
+	dom->cqm_work_cpu = cpu;
+
+	if (cpu < nr_cpu_ids)
+		schedule_delayed_work_on(cpu, &dom->cqm_limbo, delay);
+}
+
+void mbm_handle_overflow(struct work_struct *work)
+{
+	unsigned long delay = msecs_to_jiffies(MBM_OVERFLOW_INTERVAL);
+	struct rdtgroup *prgrp, *crgrp;
+	struct list_head *head;
+	struct rdt_resource *r;
+	struct rdt_domain *d;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	/*
+	 * If the filesystem has been unmounted this work no longer needs to
+	 * run.
+	 */
+	if (!resctrl_mounted || !resctrl_arch_mon_capable())
+		goto out_unlock;
+
+	r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	d = container_of(work, struct rdt_domain, mbm_over.work);
+
+	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
+		mbm_update(r, d, prgrp->closid, prgrp->mon.rmid);
+
+		head = &prgrp->mon.crdtgrp_list;
+		list_for_each_entry(crgrp, head, mon.crdtgrp_list)
+			mbm_update(r, d, crgrp->closid, crgrp->mon.rmid);
+
+		if (is_mba_sc(NULL))
+			update_mba_bw(prgrp, d);
+	}
+
+	/*
+	 * Re-check for housekeeping CPUs. This allows the overflow handler to
+	 * move off a nohz_full CPU quickly.
+	 */
+	d->mbm_work_cpu = cpumask_any_housekeeping(&d->cpu_mask,
+						   RESCTRL_PICK_ANY_CPU);
+	schedule_delayed_work_on(d->mbm_work_cpu, &d->mbm_over, delay);
+
+out_unlock:
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+}
+
+/**
+ * mbm_setup_overflow_handler() - Schedule the overflow handler to run for this
+ *                                domain.
+ * @dom:           The domain the overflow handler should run for.
+ * @delay_ms:      How far in the future the handler should run.
+ * @exclude_cpu:   Which CPU the handler should not run on,
+ *		   RESCTRL_PICK_ANY_CPU to pick any CPU.
+ */
+void mbm_setup_overflow_handler(struct rdt_domain *dom, unsigned long delay_ms,
+				int exclude_cpu)
+{
+	unsigned long delay = msecs_to_jiffies(delay_ms);
+	int cpu;
+
+	/*
+	 * When a domain comes online there is no guarantee the filesystem is
+	 * mounted. If not, there is no need to catch counter overflow.
+	 */
+	if (!resctrl_mounted || !resctrl_arch_mon_capable())
+		return;
+	cpu = cpumask_any_housekeeping(&dom->cpu_mask, exclude_cpu);
+	dom->mbm_work_cpu = cpu;
+
+	if (cpu < nr_cpu_ids)
+		schedule_delayed_work_on(cpu, &dom->mbm_over, delay);
+}
+
+static int dom_data_init(struct rdt_resource *r)
+{
+	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
+	u32 num_closid = resctrl_arch_get_num_closid(r);
+	struct rmid_entry *entry = NULL;
+	int err = 0, i;
+	u32 idx;
+
+	mutex_lock(&rdtgroup_mutex);
+	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
+		u32 *tmp;
+
+		/*
+		 * If the architecture hasn't provided a sanitised value here,
+		 * this may result in larger arrays than necessary. Resctrl will
+		 * use a smaller system wide value based on the resources in
+		 * use.
+		 */
+		tmp = kcalloc(num_closid, sizeof(*tmp), GFP_KERNEL);
+		if (!tmp) {
+			err = -ENOMEM;
+			goto out_unlock;
+		}
+
+		closid_num_dirty_rmid = tmp;
+	}
+
+	rmid_ptrs = kcalloc(idx_limit, sizeof(struct rmid_entry), GFP_KERNEL);
+	if (!rmid_ptrs) {
+		if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
+			kfree(closid_num_dirty_rmid);
+			closid_num_dirty_rmid = NULL;
+		}
+		err = -ENOMEM;
+		goto out_unlock;
+	}
+
+	for (i = 0; i < idx_limit; i++) {
+		entry = &rmid_ptrs[i];
+		INIT_LIST_HEAD(&entry->list);
+
+		resctrl_arch_rmid_idx_decode(i, &entry->closid, &entry->rmid);
+		list_add_tail(&entry->list, &rmid_free_lru);
+	}
+
+	/*
+	 * RESCTRL_RESERVED_CLOSID and RESCTRL_RESERVED_RMID are special and
+	 * are always allocated. These are used for the rdtgroup_default
+	 * control group, which will be setup later in rdtgroup_init().
+	 */
+	idx = resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
+					   RESCTRL_RESERVED_RMID);
+	entry = __rmid_entry(idx);
+	list_del(&entry->list);
+
+out_unlock:
+	mutex_unlock(&rdtgroup_mutex);
+
+	return err;
+}
+
+static void dom_data_exit(struct rdt_resource *r)
+{
+	if (!r->mon_capable)
+		return;
+
+	mutex_lock(&rdtgroup_mutex);
+	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
+		kfree(closid_num_dirty_rmid);
+		closid_num_dirty_rmid = NULL;
+	}
+
+	kfree(rmid_ptrs);
+	rmid_ptrs = NULL;
+
+	mutex_unlock(&rdtgroup_mutex);
+}
+
+static struct mon_evt llc_occupancy_event = {
+	.name		= "llc_occupancy",
+	.evtid		= QOS_L3_OCCUP_EVENT_ID,
+};
+
+static struct mon_evt mbm_total_event = {
+	.name		= "mbm_total_bytes",
+	.evtid		= QOS_L3_MBM_TOTAL_EVENT_ID,
+};
+
+static struct mon_evt mbm_local_event = {
+	.name		= "mbm_local_bytes",
+	.evtid		= QOS_L3_MBM_LOCAL_EVENT_ID,
+};
+
+/*
+ * Initialize the event list for the resource.
+ *
+ * Note that MBM events are also part of RDT_RESOURCE_L3 resource
+ * because as per the SDM the total and local memory bandwidth
+ * are enumerated as part of L3 monitoring.
+ */
+static void l3_mon_evt_init(struct rdt_resource *r)
+{
+	INIT_LIST_HEAD(&r->evt_list);
+
+	if (resctrl_arch_is_llc_occupancy_enabled())
+		list_add_tail(&llc_occupancy_event.list, &r->evt_list);
+	if (resctrl_arch_is_mbm_total_enabled())
+		list_add_tail(&mbm_total_event.list, &r->evt_list);
+	if (resctrl_arch_is_mbm_local_enabled())
+		list_add_tail(&mbm_local_event.list, &r->evt_list);
+}
+
+int resctrl_mon_resource_init(void)
+{
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	int ret;
+
+	if (!r->mon_capable)
+		return 0;
+
+	ret = dom_data_init(r);
+	if (ret)
+		return ret;
+
+	l3_mon_evt_init(r);
+
+	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_TOTAL_EVENT_ID)) {
+		mbm_total_event.configurable = true;
+		mbm_config_rftype_init("mbm_total_bytes_config");
+	}
+	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_LOCAL_EVENT_ID)) {
+		mbm_local_event.configurable = true;
+		mbm_config_rftype_init("mbm_local_bytes_config");
+	}
+
+	return 0;
+}
+
 int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 {
 	unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
@@ -262,6 +1076,13 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 	return 0;
 }
 
+void resctrl_mon_resource_exit(void)
+{
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+
+	dom_data_exit(r);
+}
+
 void __init intel_rdt_mbm_apply_quirk(void)
 {
 	int cf_index;
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index ba1596afee10..ba51ab1f70e6 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -39,6 +39,28 @@
  */
 static u64 prefetch_disable_bits;
 
+/*
+ * Major number assigned to and shared by all devices exposing
+ * pseudo-locked regions.
+ */
+static unsigned int pseudo_lock_major;
+static unsigned long pseudo_lock_minor_avail = GENMASK(MINORBITS, 0);
+
+static char *pseudo_lock_devnode(const struct device *dev, umode_t *mode)
+{
+	const struct rdtgroup *rdtgrp;
+
+	rdtgrp = dev_get_drvdata(dev);
+	if (mode)
+		*mode = 0600;
+	return kasprintf(GFP_KERNEL, "pseudo_lock/%s", rdtgrp->kn->name);
+}
+
+static const struct class pseudo_lock_class = {
+	.name = "pseudo_lock",
+	.devnode = pseudo_lock_devnode,
+};
+
 /**
  * resctrl_arch_get_prefetch_disable_bits - prefetch disable bits of supported
  *                                          platforms
@@ -99,6 +121,299 @@ u64 resctrl_arch_get_prefetch_disable_bits(void)
 	return prefetch_disable_bits;
 }
 
+/**
+ * pseudo_lock_minor_get - Obtain available minor number
+ * @minor: Pointer to where new minor number will be stored
+ *
+ * A bitmask is used to track available minor numbers. Here the next free
+ * minor number is marked as unavailable and returned.
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+static int pseudo_lock_minor_get(unsigned int *minor)
+{
+	unsigned long first_bit;
+
+	first_bit = find_first_bit(&pseudo_lock_minor_avail, MINORBITS);
+
+	if (first_bit == MINORBITS)
+		return -ENOSPC;
+
+	__clear_bit(first_bit, &pseudo_lock_minor_avail);
+	*minor = first_bit;
+
+	return 0;
+}
+
+/**
+ * pseudo_lock_minor_release - Return minor number to available
+ * @minor: The minor number made available
+ */
+static void pseudo_lock_minor_release(unsigned int minor)
+{
+	__set_bit(minor, &pseudo_lock_minor_avail);
+}
+
+/**
+ * region_find_by_minor - Locate a pseudo-lock region by inode minor number
+ * @minor: The minor number of the device representing pseudo-locked region
+ *
+ * When the character device is accessed we need to determine which
+ * pseudo-locked region it belongs to. This is done by matching the minor
+ * number of the device to the pseudo-locked region it belongs.
+ *
+ * Minor numbers are assigned at the time a pseudo-locked region is associated
+ * with a cache instance.
+ *
+ * Return: On success return pointer to resource group owning the pseudo-locked
+ *         region, NULL on failure.
+ */
+static struct rdtgroup *region_find_by_minor(unsigned int minor)
+{
+	struct rdtgroup *rdtgrp, *rdtgrp_match = NULL;
+
+	list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
+		if (rdtgrp->plr && rdtgrp->plr->minor == minor) {
+			rdtgrp_match = rdtgrp;
+			break;
+		}
+	}
+	return rdtgrp_match;
+}
+
+/**
+ * struct pseudo_lock_pm_req - A power management QoS request list entry
+ * @list:	Entry within the @pm_reqs list for a pseudo-locked region
+ * @req:	PM QoS request
+ */
+struct pseudo_lock_pm_req {
+	struct list_head list;
+	struct dev_pm_qos_request req;
+};
+
+static void pseudo_lock_cstates_relax(struct pseudo_lock_region *plr)
+{
+	struct pseudo_lock_pm_req *pm_req, *next;
+
+	list_for_each_entry_safe(pm_req, next, &plr->pm_reqs, list) {
+		dev_pm_qos_remove_request(&pm_req->req);
+		list_del(&pm_req->list);
+		kfree(pm_req);
+	}
+}
+
+/**
+ * pseudo_lock_cstates_constrain - Restrict cores from entering C6
+ * @plr: Pseudo-locked region
+ *
+ * To prevent the cache from being affected by power management entering
+ * C6 has to be avoided. This is accomplished by requesting a latency
+ * requirement lower than lowest C6 exit latency of all supported
+ * platforms as found in the cpuidle state tables in the intel_idle driver.
+ * At this time it is possible to do so with a single latency requirement
+ * for all supported platforms.
+ *
+ * Since Goldmont is supported, which is affected by X86_BUG_MONITOR,
+ * the ACPI latencies need to be considered while keeping in mind that C2
+ * may be set to map to deeper sleep states. In this case the latency
+ * requirement needs to prevent entering C2 also.
+ *
+ * Return: 0 on success, <0 on failure
+ */
+static int pseudo_lock_cstates_constrain(struct pseudo_lock_region *plr)
+{
+	struct pseudo_lock_pm_req *pm_req;
+	int cpu;
+	int ret;
+
+	for_each_cpu(cpu, &plr->d->cpu_mask) {
+		pm_req = kzalloc(sizeof(*pm_req), GFP_KERNEL);
+		if (!pm_req) {
+			rdt_last_cmd_puts("Failure to allocate memory for PM QoS\n");
+			ret = -ENOMEM;
+			goto out_err;
+		}
+		ret = dev_pm_qos_add_request(get_cpu_device(cpu),
+					     &pm_req->req,
+					     DEV_PM_QOS_RESUME_LATENCY,
+					     30);
+		if (ret < 0) {
+			rdt_last_cmd_printf("Failed to add latency req CPU%d\n",
+					    cpu);
+			kfree(pm_req);
+			ret = -1;
+			goto out_err;
+		}
+		list_add(&pm_req->list, &plr->pm_reqs);
+	}
+
+	return 0;
+
+out_err:
+	pseudo_lock_cstates_relax(plr);
+	return ret;
+}
+
+/**
+ * pseudo_lock_region_clear - Reset pseudo-lock region data
+ * @plr: pseudo-lock region
+ *
+ * All content of the pseudo-locked region is reset - any memory allocated
+ * freed.
+ *
+ * Return: void
+ */
+static void pseudo_lock_region_clear(struct pseudo_lock_region *plr)
+{
+	plr->size = 0;
+	plr->line_size = 0;
+	kfree(plr->kmem);
+	plr->kmem = NULL;
+	plr->s = NULL;
+	if (plr->d)
+		plr->d->plr = NULL;
+	plr->d = NULL;
+	plr->cbm = 0;
+	plr->debugfs_dir = NULL;
+}
+
+/**
+ * pseudo_lock_region_init - Initialize pseudo-lock region information
+ * @plr: pseudo-lock region
+ *
+ * Called after user provided a schemata to be pseudo-locked. From the
+ * schemata the &struct pseudo_lock_region is on entry already initialized
+ * with the resource, domain, and capacity bitmask. Here the information
+ * required for pseudo-locking is deduced from this data and &struct
+ * pseudo_lock_region initialized further. This information includes:
+ * - size in bytes of the region to be pseudo-locked
+ * - cache line size to know the stride with which data needs to be accessed
+ *   to be pseudo-locked
+ * - a cpu associated with the cache instance on which the pseudo-locking
+ *   flow can be executed
+ *
+ * Return: 0 on success, <0 on failure. Descriptive error will be written
+ * to last_cmd_status buffer.
+ */
+static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
+{
+	struct cpu_cacheinfo *ci;
+	int ret;
+	int i;
+
+	/* Pick the first cpu we find that is associated with the cache. */
+	plr->cpu = cpumask_first(&plr->d->cpu_mask);
+
+	if (!cpu_online(plr->cpu)) {
+		rdt_last_cmd_printf("CPU %u associated with cache not online\n",
+				    plr->cpu);
+		ret = -ENODEV;
+		goto out_region;
+	}
+
+	ci = get_cpu_cacheinfo(plr->cpu);
+
+	plr->size = rdtgroup_cbm_to_size(plr->s->res, plr->d, plr->cbm);
+
+	for (i = 0; i < ci->num_leaves; i++) {
+		if (ci->info_list[i].level == plr->s->res->cache_level) {
+			plr->line_size = ci->info_list[i].coherency_line_size;
+			return 0;
+		}
+	}
+
+	ret = -1;
+	rdt_last_cmd_puts("Unable to determine cache line size\n");
+out_region:
+	pseudo_lock_region_clear(plr);
+	return ret;
+}
+
+/**
+ * pseudo_lock_init - Initialize a pseudo-lock region
+ * @rdtgrp: resource group to which new pseudo-locked region will belong
+ *
+ * A pseudo-locked region is associated with a resource group. When this
+ * association is created the pseudo-locked region is initialized. The
+ * details of the pseudo-locked region are not known at this time so only
+ * allocation is done and association established.
+ *
+ * Return: 0 on success, <0 on failure
+ */
+static int pseudo_lock_init(struct rdtgroup *rdtgrp)
+{
+	struct pseudo_lock_region *plr;
+
+	plr = kzalloc(sizeof(*plr), GFP_KERNEL);
+	if (!plr)
+		return -ENOMEM;
+
+	init_waitqueue_head(&plr->lock_thread_wq);
+	INIT_LIST_HEAD(&plr->pm_reqs);
+	rdtgrp->plr = plr;
+	return 0;
+}
+
+/**
+ * pseudo_lock_region_alloc - Allocate kernel memory that will be pseudo-locked
+ * @plr: pseudo-lock region
+ *
+ * Initialize the details required to set up the pseudo-locked region and
+ * allocate the contiguous memory that will be pseudo-locked to the cache.
+ *
+ * Return: 0 on success, <0 on failure.  Descriptive error will be written
+ * to last_cmd_status buffer.
+ */
+static int pseudo_lock_region_alloc(struct pseudo_lock_region *plr)
+{
+	int ret;
+
+	ret = pseudo_lock_region_init(plr);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * We do not yet support contiguous regions larger than
+	 * KMALLOC_MAX_SIZE.
+	 */
+	if (plr->size > KMALLOC_MAX_SIZE) {
+		rdt_last_cmd_puts("Requested region exceeds maximum size\n");
+		ret = -E2BIG;
+		goto out_region;
+	}
+
+	plr->kmem = kzalloc(plr->size, GFP_KERNEL);
+	if (!plr->kmem) {
+		rdt_last_cmd_puts("Unable to allocate memory\n");
+		ret = -ENOMEM;
+		goto out_region;
+	}
+
+	ret = 0;
+	goto out;
+out_region:
+	pseudo_lock_region_clear(plr);
+out:
+	return ret;
+}
+
+/**
+ * pseudo_lock_free - Free a pseudo-locked region
+ * @rdtgrp: resource group to which pseudo-locked region belonged
+ *
+ * The pseudo-locked region's resources have already been released, or not
+ * yet created at this point. Now it can be freed and disassociated from the
+ * resource group.
+ *
+ * Return: void
+ */
+static void pseudo_lock_free(struct rdtgroup *rdtgrp)
+{
+	pseudo_lock_region_clear(rdtgrp->plr);
+	kfree(rdtgrp->plr);
+	rdtgrp->plr = NULL;
+}
+
 /**
  * resctrl_arch_pseudo_lock_fn - Load kernel memory into cache
  * @_plr: the pseudo-lock region descriptor
@@ -228,6 +543,345 @@ int resctrl_arch_pseudo_lock_fn(void *_plr)
 	return 0;
 }
 
+/**
+ * rdtgroup_monitor_in_progress - Test if monitoring in progress
+ * @rdtgrp: resource group being queried
+ *
+ * Return: 1 if monitor groups have been created for this resource
+ * group, 0 otherwise.
+ */
+static int rdtgroup_monitor_in_progress(struct rdtgroup *rdtgrp)
+{
+	return !list_empty(&rdtgrp->mon.crdtgrp_list);
+}
+
+/**
+ * rdtgroup_locksetup_user_restrict - Restrict user access to group
+ * @rdtgrp: resource group needing access restricted
+ *
+ * A resource group used for cache pseudo-locking cannot have cpus or tasks
+ * assigned to it. This is communicated to the user by restricting access
+ * to all the files that can be used to make such changes.
+ *
+ * Permissions restored with rdtgroup_locksetup_user_restore()
+ *
+ * Return: 0 on success, <0 on failure. If a failure occurs during the
+ * restriction of access an attempt will be made to restore permissions but
+ * the state of the mode of these files will be uncertain when a failure
+ * occurs.
+ */
+static int rdtgroup_locksetup_user_restrict(struct rdtgroup *rdtgrp)
+{
+	int ret;
+
+	ret = rdtgroup_kn_mode_restrict(rdtgrp, "tasks");
+	if (ret)
+		return ret;
+
+	ret = rdtgroup_kn_mode_restrict(rdtgrp, "cpus");
+	if (ret)
+		goto err_tasks;
+
+	ret = rdtgroup_kn_mode_restrict(rdtgrp, "cpus_list");
+	if (ret)
+		goto err_cpus;
+
+	if (resctrl_arch_mon_capable()) {
+		ret = rdtgroup_kn_mode_restrict(rdtgrp, "mon_groups");
+		if (ret)
+			goto err_cpus_list;
+	}
+
+	ret = 0;
+	goto out;
+
+err_cpus_list:
+	rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0777);
+err_cpus:
+	rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0777);
+err_tasks:
+	rdtgroup_kn_mode_restore(rdtgrp, "tasks", 0777);
+out:
+	return ret;
+}
+
+/**
+ * rdtgroup_locksetup_user_restore - Restore user access to group
+ * @rdtgrp: resource group needing access restored
+ *
+ * Restore all file access previously removed using
+ * rdtgroup_locksetup_user_restrict()
+ *
+ * Return: 0 on success, <0 on failure.  If a failure occurs during the
+ * restoration of access an attempt will be made to restrict permissions
+ * again but the state of the mode of these files will be uncertain when
+ * a failure occurs.
+ */
+static int rdtgroup_locksetup_user_restore(struct rdtgroup *rdtgrp)
+{
+	int ret;
+
+	ret = rdtgroup_kn_mode_restore(rdtgrp, "tasks", 0777);
+	if (ret)
+		return ret;
+
+	ret = rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0777);
+	if (ret)
+		goto err_tasks;
+
+	ret = rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0777);
+	if (ret)
+		goto err_cpus;
+
+	if (resctrl_arch_mon_capable()) {
+		ret = rdtgroup_kn_mode_restore(rdtgrp, "mon_groups", 0777);
+		if (ret)
+			goto err_cpus_list;
+	}
+
+	ret = 0;
+	goto out;
+
+err_cpus_list:
+	rdtgroup_kn_mode_restrict(rdtgrp, "cpus_list");
+err_cpus:
+	rdtgroup_kn_mode_restrict(rdtgrp, "cpus");
+err_tasks:
+	rdtgroup_kn_mode_restrict(rdtgrp, "tasks");
+out:
+	return ret;
+}
+
+/**
+ * rdtgroup_locksetup_enter - Resource group enters locksetup mode
+ * @rdtgrp: resource group requested to enter locksetup mode
+ *
+ * A resource group enters locksetup mode to reflect that it would be used
+ * to represent a pseudo-locked region and is in the process of being set
+ * up to do so. A resource group used for a pseudo-locked region would
+ * lose the closid associated with it so we cannot allow it to have any
+ * tasks or cpus assigned nor permit tasks or cpus to be assigned in the
+ * future. Monitoring of a pseudo-locked region is not allowed either.
+ *
+ * The above and more restrictions on a pseudo-locked region are checked
+ * for and enforced before the resource group enters the locksetup mode.
+ *
+ * Returns: 0 if the resource group successfully entered locksetup mode, <0
+ * on failure. On failure the last_cmd_status buffer is updated with text to
+ * communicate details of failure to the user.
+ */
+int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
+{
+	int ret;
+
+	/*
+	 * The default resource group can neither be removed nor lose the
+	 * default closid associated with it.
+	 */
+	if (rdtgrp == &rdtgroup_default) {
+		rdt_last_cmd_puts("Cannot pseudo-lock default group\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Cache Pseudo-locking not supported when CDP is enabled.
+	 *
+	 * Some things to consider if you would like to enable this
+	 * support (using L3 CDP as example):
+	 * - When CDP is enabled two separate resources are exposed,
+	 *   L3DATA and L3CODE, but they are actually on the same cache.
+	 *   The implication for pseudo-locking is that if a
+	 *   pseudo-locked region is created on a domain of one
+	 *   resource (eg. L3CODE), then a pseudo-locked region cannot
+	 *   be created on that same domain of the other resource
+	 *   (eg. L3DATA). This is because the creation of a
+	 *   pseudo-locked region involves a call to wbinvd that will
+	 *   affect all cache allocations on particular domain.
+	 * - Considering the previous, it may be possible to only
+	 *   expose one of the CDP resources to pseudo-locking and
+	 *   hide the other. For example, we could consider to only
+	 *   expose L3DATA and since the L3 cache is unified it is
+	 *   still possible to place instructions there are execute it.
+	 * - If only one region is exposed to pseudo-locking we should
+	 *   still keep in mind that availability of a portion of cache
+	 *   for pseudo-locking should take into account both resources.
+	 *   Similarly, if a pseudo-locked region is created in one
+	 *   resource, the portion of cache used by it should be made
+	 *   unavailable to all future allocations from both resources.
+	 */
+	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3) ||
+	    resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2)) {
+		rdt_last_cmd_puts("CDP enabled\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Not knowing the bits to disable prefetching implies that this
+	 * platform does not support Cache Pseudo-Locking.
+	 */
+	if (resctrl_arch_get_prefetch_disable_bits() == 0) {
+		rdt_last_cmd_puts("Pseudo-locking not supported\n");
+		return -EINVAL;
+	}
+
+	if (rdtgroup_monitor_in_progress(rdtgrp)) {
+		rdt_last_cmd_puts("Monitoring in progress\n");
+		return -EINVAL;
+	}
+
+	if (rdtgroup_tasks_assigned(rdtgrp)) {
+		rdt_last_cmd_puts("Tasks assigned to resource group\n");
+		return -EINVAL;
+	}
+
+	if (!cpumask_empty(&rdtgrp->cpu_mask)) {
+		rdt_last_cmd_puts("CPUs assigned to resource group\n");
+		return -EINVAL;
+	}
+
+	if (rdtgroup_locksetup_user_restrict(rdtgrp)) {
+		rdt_last_cmd_puts("Unable to modify resctrl permissions\n");
+		return -EIO;
+	}
+
+	ret = pseudo_lock_init(rdtgrp);
+	if (ret) {
+		rdt_last_cmd_puts("Unable to init pseudo-lock region\n");
+		goto out_release;
+	}
+
+	/*
+	 * If this system is capable of monitoring a rmid would have been
+	 * allocated when the control group was created. This is not needed
+	 * anymore when this group would be used for pseudo-locking. This
+	 * is safe to call on platforms not capable of monitoring.
+	 */
+	free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+
+	ret = 0;
+	goto out;
+
+out_release:
+	rdtgroup_locksetup_user_restore(rdtgrp);
+out:
+	return ret;
+}
+
+/**
+ * rdtgroup_locksetup_exit - resource group exist locksetup mode
+ * @rdtgrp: resource group
+ *
+ * When a resource group exits locksetup mode the earlier restrictions are
+ * lifted.
+ *
+ * Return: 0 on success, <0 on failure
+ */
+int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
+{
+	int ret;
+
+	if (resctrl_arch_mon_capable()) {
+		ret = alloc_rmid(rdtgrp->closid);
+		if (ret < 0) {
+			rdt_last_cmd_puts("Out of RMIDs\n");
+			return ret;
+		}
+		rdtgrp->mon.rmid = ret;
+	}
+
+	ret = rdtgroup_locksetup_user_restore(rdtgrp);
+	if (ret) {
+		free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+		return ret;
+	}
+
+	pseudo_lock_free(rdtgrp);
+	return 0;
+}
+
+/**
+ * rdtgroup_cbm_overlaps_pseudo_locked - Test if CBM or portion is pseudo-locked
+ * @d: RDT domain
+ * @cbm: CBM to test
+ *
+ * @d represents a cache instance and @cbm a capacity bitmask that is
+ * considered for it. Determine if @cbm overlaps with any existing
+ * pseudo-locked region on @d.
+ *
+ * @cbm is unsigned long, even if only 32 bits are used, to make the
+ * bitmap functions work correctly.
+ *
+ * Return: true if @cbm overlaps with pseudo-locked region on @d, false
+ * otherwise.
+ */
+bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm)
+{
+	unsigned int cbm_len;
+	unsigned long cbm_b;
+
+	if (d->plr) {
+		cbm_len = d->plr->s->res->cache.cbm_len;
+		cbm_b = d->plr->cbm;
+		if (bitmap_intersects(&cbm, &cbm_b, cbm_len))
+			return true;
+	}
+	return false;
+}
+
+/**
+ * rdtgroup_pseudo_locked_in_hierarchy - Pseudo-locked region in cache hierarchy
+ * @d: RDT domain under test
+ *
+ * The setup of a pseudo-locked region affects all cache instances within
+ * the hierarchy of the region. It is thus essential to know if any
+ * pseudo-locked regions exist within a cache hierarchy to prevent any
+ * attempts to create new pseudo-locked regions in the same hierarchy.
+ *
+ * Return: true if a pseudo-locked region exists in the hierarchy of @d or
+ *         if it is not possible to test due to memory allocation issue,
+ *         false otherwise.
+ */
+bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
+{
+	cpumask_var_t cpu_with_psl;
+	enum resctrl_res_level i;
+	struct rdt_resource *r;
+	struct rdt_domain *d_i;
+	bool ret = false;
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	if (!zalloc_cpumask_var(&cpu_with_psl, GFP_KERNEL))
+		return true;
+
+	/*
+	 * First determine which cpus have pseudo-locked regions
+	 * associated with them.
+	 */
+	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
+		r = resctrl_arch_get_resource(i);
+		if (!r->alloc_capable)
+			continue;
+
+		list_for_each_entry(d_i, &r->domains, list) {
+			if (d_i->plr)
+				cpumask_or(cpu_with_psl, cpu_with_psl,
+					   &d_i->cpu_mask);
+		}
+	}
+
+	/*
+	 * Next test if new pseudo-locked region would intersect with
+	 * existing region.
+	 */
+	if (cpumask_intersects(&d->cpu_mask, cpu_with_psl))
+		ret = true;
+
+	free_cpumask_var(cpu_with_psl);
+	return ret;
+}
+
 /**
  * resctrl_arch_measure_cycles_lat_fn - Measure cycle latency to read
  *                                      pseudo-locked memory
@@ -520,3 +1174,442 @@ int resctrl_arch_measure_l3_residency(void *_plr)
 	wake_up_interruptible(&plr->lock_thread_wq);
 	return 0;
 }
+
+/**
+ * pseudo_lock_measure_cycles - Trigger latency measure to pseudo-locked region
+ * @rdtgrp: Resource group to which the pseudo-locked region belongs.
+ * @sel: Selector of which measurement to perform on a pseudo-locked region.
+ *
+ * The measurement of latency to access a pseudo-locked region should be
+ * done from a cpu that is associated with that pseudo-locked region.
+ * Determine which cpu is associated with this region and start a thread on
+ * that cpu to perform the measurement, wait for that thread to complete.
+ *
+ * Return: 0 on success, <0 on failure
+ */
+static int pseudo_lock_measure_cycles(struct rdtgroup *rdtgrp, int sel)
+{
+	struct pseudo_lock_region *plr = rdtgrp->plr;
+	struct task_struct *thread;
+	unsigned int cpu;
+	int ret = -1;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	if (rdtgrp->flags & RDT_DELETED) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	if (!plr->d) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	plr->thread_done = 0;
+	cpu = cpumask_first(&plr->d->cpu_mask);
+	if (!cpu_online(cpu)) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	plr->cpu = cpu;
+
+	if (sel == 1)
+		thread = kthread_create_on_node(resctrl_arch_measure_cycles_lat_fn,
+						plr, cpu_to_node(cpu),
+						"pseudo_lock_measure/%u",
+						cpu);
+	else if (sel == 2)
+		thread = kthread_create_on_node(resctrl_arch_measure_l2_residency,
+						plr, cpu_to_node(cpu),
+						"pseudo_lock_measure/%u",
+						cpu);
+	else if (sel == 3)
+		thread = kthread_create_on_node(resctrl_arch_measure_l3_residency,
+						plr, cpu_to_node(cpu),
+						"pseudo_lock_measure/%u",
+						cpu);
+	else
+		goto out;
+
+	if (IS_ERR(thread)) {
+		ret = PTR_ERR(thread);
+		goto out;
+	}
+	kthread_bind(thread, cpu);
+	wake_up_process(thread);
+
+	ret = wait_event_interruptible(plr->lock_thread_wq,
+				       plr->thread_done == 1);
+	if (ret < 0)
+		goto out;
+
+	ret = 0;
+
+out:
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+	return ret;
+}
+
+static ssize_t pseudo_lock_measure_trigger(struct file *file,
+					   const char __user *user_buf,
+					   size_t count, loff_t *ppos)
+{
+	struct rdtgroup *rdtgrp = file->private_data;
+	size_t buf_size;
+	char buf[32];
+	int ret;
+	int sel;
+
+	buf_size = min(count, (sizeof(buf) - 1));
+	if (copy_from_user(buf, user_buf, buf_size))
+		return -EFAULT;
+
+	buf[buf_size] = '\0';
+	ret = kstrtoint(buf, 10, &sel);
+	if (ret == 0) {
+		if (sel != 1 && sel != 2 && sel != 3)
+			return -EINVAL;
+		ret = debugfs_file_get(file->f_path.dentry);
+		if (ret)
+			return ret;
+		ret = pseudo_lock_measure_cycles(rdtgrp, sel);
+		if (ret == 0)
+			ret = count;
+		debugfs_file_put(file->f_path.dentry);
+	}
+
+	return ret;
+}
+
+static const struct file_operations pseudo_measure_fops = {
+	.write = pseudo_lock_measure_trigger,
+	.open = simple_open,
+	.llseek = default_llseek,
+};
+
+/**
+ * rdtgroup_pseudo_lock_create - Create a pseudo-locked region
+ * @rdtgrp: resource group to which pseudo-lock region belongs
+ *
+ * Called when a resource group in the pseudo-locksetup mode receives a
+ * valid schemata that should be pseudo-locked. Since the resource group is
+ * in pseudo-locksetup mode the &struct pseudo_lock_region has already been
+ * allocated and initialized with the essential information. If a failure
+ * occurs the resource group remains in the pseudo-locksetup mode with the
+ * &struct pseudo_lock_region associated with it, but cleared from all
+ * information and ready for the user to re-attempt pseudo-locking by
+ * writing the schemata again.
+ *
+ * Return: 0 if the pseudo-locked region was successfully pseudo-locked, <0
+ * on failure. Descriptive error will be written to last_cmd_status buffer.
+ */
+int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
+{
+	struct pseudo_lock_region *plr = rdtgrp->plr;
+	struct task_struct *thread;
+	unsigned int new_minor;
+	struct device *dev;
+	int ret;
+
+	ret = pseudo_lock_region_alloc(plr);
+	if (ret < 0)
+		return ret;
+
+	ret = pseudo_lock_cstates_constrain(plr);
+	if (ret < 0) {
+		ret = -EINVAL;
+		goto out_region;
+	}
+
+	plr->thread_done = 0;
+
+	plr->closid = rdtgrp->closid;
+	thread = kthread_create_on_node(resctrl_arch_pseudo_lock_fn, plr,
+					cpu_to_node(plr->cpu),
+					"pseudo_lock/%u", plr->cpu);
+	if (IS_ERR(thread)) {
+		ret = PTR_ERR(thread);
+		rdt_last_cmd_printf("Locking thread returned error %d\n", ret);
+		goto out_cstates;
+	}
+
+	kthread_bind(thread, plr->cpu);
+	wake_up_process(thread);
+
+	ret = wait_event_interruptible(plr->lock_thread_wq,
+				       plr->thread_done == 1);
+	if (ret < 0) {
+		/*
+		 * If the thread does not get on the CPU for whatever
+		 * reason and the process which sets up the region is
+		 * interrupted then this will leave the thread in runnable
+		 * state and once it gets on the CPU it will dereference
+		 * the cleared, but not freed, plr struct resulting in an
+		 * empty pseudo-locking loop.
+		 */
+		rdt_last_cmd_puts("Locking thread interrupted\n");
+		goto out_cstates;
+	}
+
+	ret = pseudo_lock_minor_get(&new_minor);
+	if (ret < 0) {
+		rdt_last_cmd_puts("Unable to obtain a new minor number\n");
+		goto out_cstates;
+	}
+
+	/*
+	 * Unlock access but do not release the reference. The
+	 * pseudo-locked region will still be here on return.
+	 *
+	 * The mutex has to be released temporarily to avoid a potential
+	 * deadlock with the mm->mmap_lock which is obtained in the
+	 * device_create() and debugfs_create_dir() callpath below as well as
+	 * before the mmap() callback is called.
+	 */
+	mutex_unlock(&rdtgroup_mutex);
+
+	if (!IS_ERR_OR_NULL(debugfs_resctrl)) {
+		plr->debugfs_dir = debugfs_create_dir(rdtgrp->kn->name,
+						      debugfs_resctrl);
+		if (!IS_ERR_OR_NULL(plr->debugfs_dir))
+			debugfs_create_file("pseudo_lock_measure", 0200,
+					    plr->debugfs_dir, rdtgrp,
+					    &pseudo_measure_fops);
+	}
+
+	dev = device_create(&pseudo_lock_class, NULL,
+			    MKDEV(pseudo_lock_major, new_minor),
+			    rdtgrp, "%s", rdtgrp->kn->name);
+
+	mutex_lock(&rdtgroup_mutex);
+
+	if (IS_ERR(dev)) {
+		ret = PTR_ERR(dev);
+		rdt_last_cmd_printf("Failed to create character device: %d\n",
+				    ret);
+		goto out_debugfs;
+	}
+
+	/* We released the mutex - check if group was removed while we did so */
+	if (rdtgrp->flags & RDT_DELETED) {
+		ret = -ENODEV;
+		goto out_device;
+	}
+
+	plr->minor = new_minor;
+
+	rdtgrp->mode = RDT_MODE_PSEUDO_LOCKED;
+	closid_free(rdtgrp->closid);
+	rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0444);
+	rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0444);
+
+	ret = 0;
+	goto out;
+
+out_device:
+	device_destroy(&pseudo_lock_class, MKDEV(pseudo_lock_major, new_minor));
+out_debugfs:
+	debugfs_remove_recursive(plr->debugfs_dir);
+	pseudo_lock_minor_release(new_minor);
+out_cstates:
+	pseudo_lock_cstates_relax(plr);
+out_region:
+	pseudo_lock_region_clear(plr);
+out:
+	return ret;
+}
+
+/**
+ * rdtgroup_pseudo_lock_remove - Remove a pseudo-locked region
+ * @rdtgrp: resource group to which the pseudo-locked region belongs
+ *
+ * The removal of a pseudo-locked region can be initiated when the resource
+ * group is removed from user space via a "rmdir" from userspace or the
+ * unmount of the resctrl filesystem. On removal the resource group does
+ * not go back to pseudo-locksetup mode before it is removed, instead it is
+ * removed directly. There is thus asymmetry with the creation where the
+ * &struct pseudo_lock_region is removed here while it was not created in
+ * rdtgroup_pseudo_lock_create().
+ *
+ * Return: void
+ */
+void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp)
+{
+	struct pseudo_lock_region *plr = rdtgrp->plr;
+
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+		/*
+		 * Default group cannot be a pseudo-locked region so we can
+		 * free closid here.
+		 */
+		closid_free(rdtgrp->closid);
+		goto free;
+	}
+
+	pseudo_lock_cstates_relax(plr);
+	debugfs_remove_recursive(rdtgrp->plr->debugfs_dir);
+	device_destroy(&pseudo_lock_class, MKDEV(pseudo_lock_major, plr->minor));
+	pseudo_lock_minor_release(plr->minor);
+
+free:
+	pseudo_lock_free(rdtgrp);
+}
+
+static int pseudo_lock_dev_open(struct inode *inode, struct file *filp)
+{
+	struct rdtgroup *rdtgrp;
+
+	mutex_lock(&rdtgroup_mutex);
+
+	rdtgrp = region_find_by_minor(iminor(inode));
+	if (!rdtgrp) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -ENODEV;
+	}
+
+	filp->private_data = rdtgrp;
+	atomic_inc(&rdtgrp->waitcount);
+	/* Perform a non-seekable open - llseek is not supported */
+	filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
+
+	mutex_unlock(&rdtgroup_mutex);
+
+	return 0;
+}
+
+static int pseudo_lock_dev_release(struct inode *inode, struct file *filp)
+{
+	struct rdtgroup *rdtgrp;
+
+	mutex_lock(&rdtgroup_mutex);
+	rdtgrp = filp->private_data;
+	WARN_ON(!rdtgrp);
+	if (!rdtgrp) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -ENODEV;
+	}
+	filp->private_data = NULL;
+	atomic_dec(&rdtgrp->waitcount);
+	mutex_unlock(&rdtgroup_mutex);
+	return 0;
+}
+
+static int pseudo_lock_dev_mremap(struct vm_area_struct *area)
+{
+	/* Not supported */
+	return -EINVAL;
+}
+
+static const struct vm_operations_struct pseudo_mmap_ops = {
+	.mremap = pseudo_lock_dev_mremap,
+};
+
+static int pseudo_lock_dev_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	unsigned long vsize = vma->vm_end - vma->vm_start;
+	unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
+	struct pseudo_lock_region *plr;
+	struct rdtgroup *rdtgrp;
+	unsigned long physical;
+	unsigned long psize;
+
+	mutex_lock(&rdtgroup_mutex);
+
+	rdtgrp = filp->private_data;
+	WARN_ON(!rdtgrp);
+	if (!rdtgrp) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -ENODEV;
+	}
+
+	plr = rdtgrp->plr;
+
+	if (!plr->d) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -ENODEV;
+	}
+
+	/*
+	 * Task is required to run with affinity to the cpus associated
+	 * with the pseudo-locked region. If this is not the case the task
+	 * may be scheduled elsewhere and invalidate entries in the
+	 * pseudo-locked region.
+	 */
+	if (!cpumask_subset(current->cpus_ptr, &plr->d->cpu_mask)) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -EINVAL;
+	}
+
+	physical = __pa(plr->kmem) >> PAGE_SHIFT;
+	psize = plr->size - off;
+
+	if (off > plr->size) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -ENOSPC;
+	}
+
+	/*
+	 * Ensure changes are carried directly to the memory being mapped,
+	 * do not allow copy-on-write mapping.
+	 */
+	if (!(vma->vm_flags & VM_SHARED)) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -EINVAL;
+	}
+
+	if (vsize > psize) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -ENOSPC;
+	}
+
+	memset(plr->kmem + off, 0, vsize);
+
+	if (remap_pfn_range(vma, vma->vm_start, physical + vma->vm_pgoff,
+			    vsize, vma->vm_page_prot)) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -EAGAIN;
+	}
+	vma->vm_ops = &pseudo_mmap_ops;
+	mutex_unlock(&rdtgroup_mutex);
+	return 0;
+}
+
+static const struct file_operations pseudo_lock_dev_fops = {
+	.owner =	THIS_MODULE,
+	.llseek =	no_llseek,
+	.read =		NULL,
+	.write =	NULL,
+	.open =		pseudo_lock_dev_open,
+	.release =	pseudo_lock_dev_release,
+	.mmap =		pseudo_lock_dev_mmap,
+};
+
+int rdt_pseudo_lock_init(void)
+{
+	int ret;
+
+	ret = register_chrdev(0, "pseudo_lock", &pseudo_lock_dev_fops);
+	if (ret < 0)
+		return ret;
+
+	pseudo_lock_major = ret;
+
+	ret = class_register(&pseudo_lock_class);
+	if (ret) {
+		unregister_chrdev(pseudo_lock_major, "pseudo_lock");
+		return ret;
+	}
+
+	return 0;
+}
+
+void rdt_pseudo_lock_release(void)
+{
+	class_unregister(&pseudo_lock_class);
+	unregister_chrdev(pseudo_lock_major, "pseudo_lock");
+	pseudo_lock_major = 0;
+}
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index fe3952514add..1425a33d201d 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -12,8 +12,22 @@
 
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
 
+#include <linux/cacheinfo.h>
 #include <linux/cpu.h>
+#include <linux/debugfs.h>
+#include <linux/fs.h>
+#include <linux/fs_parser.h>
+#include <linux/sysfs.h>
+#include <linux/kernfs.h>
+#include <linux/seq_buf.h>
+#include <linux/seq_file.h>
+#include <linux/sched/signal.h>
+#include <linux/sched/task.h>
 #include <linux/slab.h>
+#include <linux/task_work.h>
+#include <linux/user_namespace.h>
+
+#include <uapi/linux/magic.h>
 
 #include <asm/resctrl.h>
 #include "internal.h"
@@ -22,239 +36,4219 @@ DEFINE_STATIC_KEY_FALSE(rdt_enable_key);
 DEFINE_STATIC_KEY_FALSE(rdt_mon_enable_key);
 DEFINE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
 
+/* Mutex to protect rdtgroup access. */
+DEFINE_MUTEX(rdtgroup_mutex);
+
+static struct kernfs_root *rdt_root;
+struct rdtgroup rdtgroup_default;
+LIST_HEAD(rdt_all_groups);
+
+/* list of entries for the schemata file */
+LIST_HEAD(resctrl_schema_all);
+
+/* The filesystem can only be mounted once. */
+bool resctrl_mounted;
+
+/* Kernel fs node for "info" directory under root */
+static struct kernfs_node *kn_info;
+
+/* Kernel fs node for "mon_groups" directory under root */
+static struct kernfs_node *kn_mongrp;
+
+/* Kernel fs node for "mon_data" directory under root */
+static struct kernfs_node *kn_mondata;
+
 /*
- * This is safe against resctrl_arch_sched_in() called from __switch_to()
- * because __switch_to() is executed with interrupts disabled. A local call
- * from update_closid_rmid() is protected against __switch_to() because
- * preemption is disabled.
+ * Used to store the max resource name width and max resource data width
+ * to display the schemata in a tabular format
  */
-void resctrl_arch_sync_cpu_defaults(void *info)
+int max_name_width, max_data_width;
+
+static struct seq_buf last_cmd_status;
+static char last_cmd_status_buf[512];
+
+static int rdtgroup_setup_root(struct rdt_fs_context *ctx);
+static void rdtgroup_destroy_root(void);
+
+struct dentry *debugfs_resctrl;
+
+static bool resctrl_debug;
+
+void rdt_last_cmd_clear(void)
 {
-	struct resctrl_cpu_sync *r = info;
+	lockdep_assert_held(&rdtgroup_mutex);
+	seq_buf_clear(&last_cmd_status);
+}
 
-	if (r) {
-		this_cpu_write(pqr_state.default_closid, r->closid);
-		this_cpu_write(pqr_state.default_rmid, r->rmid);
+void rdt_last_cmd_puts(const char *s)
+{
+	lockdep_assert_held(&rdtgroup_mutex);
+	seq_buf_puts(&last_cmd_status, s);
+}
+
+void rdt_last_cmd_printf(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	lockdep_assert_held(&rdtgroup_mutex);
+	seq_buf_vprintf(&last_cmd_status, fmt, ap);
+	va_end(ap);
+}
+
+void rdt_staged_configs_clear(void)
+{
+	enum resctrl_res_level i;
+	struct rdt_resource *r;
+	struct rdt_domain *dom;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
+		r = resctrl_arch_get_resource(i);
+		if (!r->alloc_capable)
+			continue;
+
+		list_for_each_entry(dom, &r->domains, list)
+			memset(dom->staged_config, 0, sizeof(dom->staged_config));
 	}
+}
 
-	/*
-	 * We cannot unconditionally write the MSR because the current
-	 * executing task might have its own closid selected. Just reuse
-	 * the context switch code.
-	 */
-	resctrl_arch_sched_in(current);
+static bool resctrl_is_mbm_enabled(void)
+{
+	return (resctrl_arch_is_mbm_total_enabled() ||
+		resctrl_arch_is_mbm_local_enabled());
 }
 
-#define INVALID_CONFIG_INDEX   UINT_MAX
+static bool resctrl_is_mbm_event(int e)
+{
+	return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
+		e <= QOS_L3_MBM_LOCAL_EVENT_ID);
+}
 
-/**
- * mon_event_config_index_get - get the hardware index for the
- *                              configurable event
- * @evtid: event id.
+/*
+ * Trivial allocator for CLOSIDs. Since h/w only supports a small number,
+ * we can keep a bitmap of free CLOSIDs in a single integer.
  *
- * Return: 0 for evtid == QOS_L3_MBM_TOTAL_EVENT_ID
- *         1 for evtid == QOS_L3_MBM_LOCAL_EVENT_ID
- *         INVALID_CONFIG_INDEX for invalid evtid
+ * Using a global CLOSID across all resources has some advantages and
+ * some drawbacks:
+ * + We can simply set current's closid to assign a task to a resource
+ *   group.
+ * + Context switch code can avoid extra memory references deciding which
+ *   CLOSID to load into the PQR_ASSOC MSR
+ * - We give up some options in configuring resource groups across multi-socket
+ *   systems.
+ * - Our choices on how to configure each resource become progressively more
+ *   limited as the number of resources grows.
  */
-static inline unsigned int mon_event_config_index_get(u32 evtid)
+static unsigned long closid_free_map;
+static int closid_free_map_len;
+
+int closids_supported(void)
 {
-	switch (evtid) {
-	case QOS_L3_MBM_TOTAL_EVENT_ID:
-		return 0;
-	case QOS_L3_MBM_LOCAL_EVENT_ID:
-		return 1;
-	default:
-		/* Should never reach here */
-		return INVALID_CONFIG_INDEX;
-	}
+	return closid_free_map_len;
 }
 
-void resctrl_arch_mon_event_config_read(void *info)
+static void closid_init(void)
 {
-	struct resctrl_mon_config_info *mon_info = info;
-	unsigned int index;
-	u64 msrval;
+	struct resctrl_schema *s;
+	u32 rdt_min_closid = 32;
 
-	index = mon_event_config_index_get(mon_info->evtid);
-	if (index == INVALID_CONFIG_INDEX) {
-		pr_warn_once("Invalid event id %d\n", mon_info->evtid);
-		return;
-	}
-	rdmsrl(MSR_IA32_EVT_CFG_BASE + index, msrval);
+	/* Compute rdt_min_closid across all resources */
+	list_for_each_entry(s, &resctrl_schema_all, list)
+		rdt_min_closid = min(rdt_min_closid, s->num_closid);
 
-	/* Report only the valid event configuration bits */
-	mon_info->mon_config = msrval & MAX_EVT_CONFIG_BITS;
+	closid_free_map = BIT_MASK(rdt_min_closid) - 1;
+
+	/* RESCTRL_RESERVED_CLOSID is always reserved for the default group */
+	__clear_bit(RESCTRL_RESERVED_CLOSID, &closid_free_map);
+	closid_free_map_len = rdt_min_closid;
 }
 
-void resctrl_arch_mon_event_config_write(void *info)
+static int closid_alloc(void)
 {
-	struct resctrl_mon_config_info *mon_info = info;
-	unsigned int index;
+	int cleanest_closid;
+	u32 closid;
 
-	index = mon_event_config_index_get(mon_info->evtid);
-	if (index == INVALID_CONFIG_INDEX) {
-		pr_warn_once("Invalid event id %d\n", mon_info->evtid);
-		mon_info->err = -EINVAL;
-		return;
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID) &&
+	    resctrl_arch_is_llc_occupancy_enabled()) {
+		cleanest_closid = resctrl_find_cleanest_closid();
+		if (cleanest_closid < 0)
+			return cleanest_closid;
+		closid = cleanest_closid;
+	} else {
+		closid = ffs(closid_free_map);
+		if (closid == 0)
+			return -ENOSPC;
+		closid--;
 	}
-	wrmsr(MSR_IA32_EVT_CFG_BASE + index, mon_info->mon_config, 0);
+	__clear_bit(closid, &closid_free_map);
 
-	mon_info->err = 0;
+	return closid;
 }
 
-static void l3_qos_cfg_update(void *arg)
+void closid_free(int closid)
 {
-	bool *enable = arg;
+	lockdep_assert_held(&rdtgroup_mutex);
 
-	wrmsrl(MSR_IA32_L3_QOS_CFG, *enable ? L3_QOS_CDP_ENABLE : 0ULL);
+	__set_bit(closid, &closid_free_map);
 }
 
-static void l2_qos_cfg_update(void *arg)
+/**
+ * closid_allocated - test if provided closid is in use
+ * @closid: closid to be tested
+ *
+ * Return: true if @closid is currently associated with a resource group,
+ * false if @closid is free
+ */
+bool closid_allocated(unsigned int closid)
 {
-	bool *enable = arg;
+	lockdep_assert_held(&rdtgroup_mutex);
 
-	wrmsrl(MSR_IA32_L2_QOS_CFG, *enable ? L2_QOS_CDP_ENABLE : 0ULL);
+	return !test_bit(closid, &closid_free_map);
 }
 
-static int set_cache_qos_cfg(int level, bool enable)
+/**
+ * rdtgroup_mode_by_closid - Return mode of resource group with closid
+ * @closid: closid if the resource group
+ *
+ * Each resource group is associated with a @closid. Here the mode
+ * of a resource group can be queried by searching for it using its closid.
+ *
+ * Return: mode as &enum rdtgrp_mode of resource group with closid @closid
+ */
+enum rdtgrp_mode rdtgroup_mode_by_closid(int closid)
 {
-	void (*update)(void *arg);
-	struct rdt_resource *r_l;
-	cpumask_var_t cpu_mask;
-	struct rdt_domain *d;
-	int cpu;
+	struct rdtgroup *rdtgrp;
 
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
+	list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
+		if (rdtgrp->closid == closid)
+			return rdtgrp->mode;
+	}
 
-	if (level == RDT_RESOURCE_L3)
-		update = l3_qos_cfg_update;
-	else if (level == RDT_RESOURCE_L2)
-		update = l2_qos_cfg_update;
-	else
-		return -EINVAL;
+	return RDT_NUM_MODES;
+}
 
-	if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
-		return -ENOMEM;
+static const char * const rdt_mode_str[] = {
+	[RDT_MODE_SHAREABLE]		= "shareable",
+	[RDT_MODE_EXCLUSIVE]		= "exclusive",
+	[RDT_MODE_PSEUDO_LOCKSETUP]	= "pseudo-locksetup",
+	[RDT_MODE_PSEUDO_LOCKED]	= "pseudo-locked",
+};
 
-	r_l = &rdt_resources_all[level].r_resctrl;
-	list_for_each_entry(d, &r_l->domains, list) {
-		if (r_l->cache.arch_has_per_cpu_cfg)
-			/* Pick all the CPUs in the domain instance */
-			for_each_cpu(cpu, &d->cpu_mask)
-				cpumask_set_cpu(cpu, cpu_mask);
-		else
-			/* Pick one CPU from each domain instance to update MSR */
-			cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
+/**
+ * rdtgroup_mode_str - Return the string representation of mode
+ * @mode: the resource group mode as &enum rdtgroup_mode
+ *
+ * Return: string representation of valid mode, "unknown" otherwise
+ */
+static const char *rdtgroup_mode_str(enum rdtgrp_mode mode)
+{
+	if (mode < RDT_MODE_SHAREABLE || mode >= RDT_NUM_MODES)
+		return "unknown";
+
+	return rdt_mode_str[mode];
+}
+
+/* set uid and gid of rdtgroup dirs and files to that of the creator */
+static int rdtgroup_kn_set_ugid(struct kernfs_node *kn)
+{
+	struct iattr iattr = { .ia_valid = ATTR_UID | ATTR_GID,
+				.ia_uid = current_fsuid(),
+				.ia_gid = current_fsgid(), };
+
+	if (uid_eq(iattr.ia_uid, GLOBAL_ROOT_UID) &&
+	    gid_eq(iattr.ia_gid, GLOBAL_ROOT_GID))
+		return 0;
+
+	return kernfs_setattr(kn, &iattr);
+}
+
+static int rdtgroup_add_file(struct kernfs_node *parent_kn, struct rftype *rft)
+{
+	struct kernfs_node *kn;
+	int ret;
+
+	kn = __kernfs_create_file(parent_kn, rft->name, rft->mode,
+				  GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
+				  0, rft->kf_ops, rft, NULL, NULL);
+	if (IS_ERR(kn))
+		return PTR_ERR(kn);
+
+	ret = rdtgroup_kn_set_ugid(kn);
+	if (ret) {
+		kernfs_remove(kn);
+		return ret;
 	}
 
-	/* Update QOS_CFG MSR on all the CPUs in cpu_mask */
-	on_each_cpu_mask(cpu_mask, update, &enable, 1);
+	return 0;
+}
 
-	free_cpumask_var(cpu_mask);
+static int rdtgroup_seqfile_show(struct seq_file *m, void *arg)
+{
+	struct kernfs_open_file *of = m->private;
+	struct rftype *rft = of->kn->priv;
 
+	if (rft->seq_show)
+		return rft->seq_show(of, m, arg);
 	return 0;
 }
 
-/* Restore the qos cfg state when a domain comes online */
-void rdt_domain_reconfigure_cdp(struct rdt_resource *r)
+static ssize_t rdtgroup_file_write(struct kernfs_open_file *of, char *buf,
+				   size_t nbytes, loff_t off)
 {
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
+	struct rftype *rft = of->kn->priv;
 
-	if (!r->cdp_capable)
-		return;
+	if (rft->write)
+		return rft->write(of, buf, nbytes, off);
 
-	if (r->rid == RDT_RESOURCE_L2)
-		l2_qos_cfg_update(&hw_res->cdp_enabled);
+	return -EINVAL;
+}
 
-	if (r->rid == RDT_RESOURCE_L3)
-		l3_qos_cfg_update(&hw_res->cdp_enabled);
+static const struct kernfs_ops rdtgroup_kf_single_ops = {
+	.atomic_write_len	= PAGE_SIZE,
+	.write			= rdtgroup_file_write,
+	.seq_show		= rdtgroup_seqfile_show,
+};
+
+static const struct kernfs_ops kf_mondata_ops = {
+	.atomic_write_len	= PAGE_SIZE,
+	.seq_show		= rdtgroup_mondata_show,
+};
+
+static bool is_cpu_list(struct kernfs_open_file *of)
+{
+	struct rftype *rft = of->kn->priv;
+
+	return rft->flags & RFTYPE_FLAGS_CPUS_LIST;
 }
 
-static int cdp_enable(int level)
+static int rdtgroup_cpus_show(struct kernfs_open_file *of,
+			      struct seq_file *s, void *v)
 {
-	struct rdt_resource *r_l = &rdt_resources_all[level].r_resctrl;
-	int ret;
+	struct rdtgroup *rdtgrp;
+	struct cpumask *mask;
+	int ret = 0;
 
-	if (!r_l->alloc_capable)
-		return -EINVAL;
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
 
-	ret = set_cache_qos_cfg(level, true);
-	if (!ret)
-		rdt_resources_all[level].cdp_enabled = true;
+	if (rdtgrp) {
+		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+			if (!rdtgrp->plr->d) {
+				rdt_last_cmd_clear();
+				rdt_last_cmd_puts("Cache domain offline\n");
+				ret = -ENODEV;
+			} else {
+				mask = &rdtgrp->plr->d->cpu_mask;
+				seq_printf(s, is_cpu_list(of) ?
+					   "%*pbl\n" : "%*pb\n",
+					   cpumask_pr_args(mask));
+			}
+		} else {
+			seq_printf(s, is_cpu_list(of) ? "%*pbl\n" : "%*pb\n",
+				   cpumask_pr_args(&rdtgrp->cpu_mask));
+		}
+	} else {
+		ret = -ENOENT;
+	}
+	rdtgroup_kn_unlock(of->kn);
 
 	return ret;
 }
 
-static void cdp_disable(int level)
+/*
+ * This is safe against resctrl_arch_sched_in() called from __switch_to()
+ * because __switch_to() is executed with interrupts disabled. A local call
+ * from update_closid_rmid() is protected against __switch_to() because
+ * preemption is disabled.
+ */
+void resctrl_arch_sync_cpu_defaults(void *info)
 {
-	struct rdt_hw_resource *r_hw = &rdt_resources_all[level];
+	struct resctrl_cpu_sync *r = info;
 
-	if (r_hw->cdp_enabled) {
-		set_cache_qos_cfg(level, false);
-		r_hw->cdp_enabled = false;
+	if (r) {
+		this_cpu_write(pqr_state.default_closid, r->closid);
+		this_cpu_write(pqr_state.default_rmid, r->rmid);
+	}
+
+	/*
+	 * We cannot unconditionally write the MSR because the current
+	 * executing task might have its own closid selected. Just reuse
+	 * the context switch code.
+	 */
+	resctrl_arch_sched_in(current);
+}
+
+/*
+ * Update the PGR_ASSOC MSR on all cpus in @cpu_mask,
+ *
+ * Per task closids/rmids must have been set up before calling this function.
+ * @r may be NULL.
+ */
+static void
+update_closid_rmid(const struct cpumask *cpu_mask, struct rdtgroup *r)
+{
+	struct resctrl_cpu_sync defaults;
+	struct resctrl_cpu_sync *defaults_p = NULL;
+
+	if (r) {
+		defaults.closid = r->closid;
+		defaults.rmid = r->mon.rmid;
+		defaults_p = &defaults;
 	}
+
+	on_each_cpu_mask(cpu_mask, resctrl_arch_sync_cpu_defaults, defaults_p,
+			 1);
 }
 
-int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable)
+static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
+			  cpumask_var_t tmpmask)
 {
-	struct rdt_hw_resource *hw_res = &rdt_resources_all[l];
+	struct rdtgroup *prgrp = rdtgrp->mon.parent, *crgrp;
+	struct list_head *head;
 
-	if (!hw_res->r_resctrl.cdp_capable)
+	/* Check whether cpus belong to parent ctrl group */
+	cpumask_andnot(tmpmask, newmask, &prgrp->cpu_mask);
+	if (!cpumask_empty(tmpmask)) {
+		rdt_last_cmd_puts("Can only add CPUs to mongroup that belong to parent\n");
 		return -EINVAL;
+	}
 
-	if (enable)
-		return cdp_enable(l);
+	/* Check whether cpus are dropped from this group */
+	cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
+	if (!cpumask_empty(tmpmask)) {
+		/* Give any dropped cpus to parent rdtgroup */
+		cpumask_or(&prgrp->cpu_mask, &prgrp->cpu_mask, tmpmask);
+		update_closid_rmid(tmpmask, prgrp);
+	}
 
-	cdp_disable(l);
+	/*
+	 * If we added cpus, remove them from previous group that owned them
+	 * and update per-cpu rmid
+	 */
+	cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask);
+	if (!cpumask_empty(tmpmask)) {
+		head = &prgrp->mon.crdtgrp_list;
+		list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
+			if (crgrp == rdtgrp)
+				continue;
+			cpumask_andnot(&crgrp->cpu_mask, &crgrp->cpu_mask,
+				       tmpmask);
+		}
+		update_closid_rmid(tmpmask, rdtgrp);
+	}
+
+	/* Done pushing/pulling - update this group with new mask */
+	cpumask_copy(&rdtgrp->cpu_mask, newmask);
 
 	return 0;
 }
 
-static int reset_all_ctrls(struct rdt_resource *r)
+static void cpumask_rdtgrp_clear(struct rdtgroup *r, struct cpumask *m)
 {
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-	struct rdt_hw_domain *hw_dom;
-	struct msr_param msr_param;
-	cpumask_var_t cpu_mask;
-	struct rdt_domain *d;
-	int i;
+	struct rdtgroup *crgrp;
 
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
+	cpumask_andnot(&r->cpu_mask, &r->cpu_mask, m);
+	/* update the child mon group masks as well*/
+	list_for_each_entry(crgrp, &r->mon.crdtgrp_list, mon.crdtgrp_list)
+		cpumask_and(&crgrp->cpu_mask, &r->cpu_mask, &crgrp->cpu_mask);
+}
 
-	if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
-		return -ENOMEM;
+static int cpus_ctrl_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
+			   cpumask_var_t tmpmask, cpumask_var_t tmpmask1)
+{
+	struct rdtgroup *r, *crgrp;
+	struct list_head *head;
 
-	msr_param.res = r;
-	msr_param.low = 0;
-	msr_param.high = hw_res->num_closid;
+	/* Check whether cpus are dropped from this group */
+	cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
+	if (!cpumask_empty(tmpmask)) {
+		/* Can't drop from default group */
+		if (rdtgrp == &rdtgroup_default) {
+			rdt_last_cmd_puts("Can't drop CPUs from default group\n");
+			return -EINVAL;
+		}
+
+		/* Give any dropped cpus to rdtgroup_default */
+		cpumask_or(&rdtgroup_default.cpu_mask,
+			   &rdtgroup_default.cpu_mask, tmpmask);
+		update_closid_rmid(tmpmask, &rdtgroup_default);
+	}
 
 	/*
-	 * Disable resource control for this resource by setting all
-	 * CBMs in all domains to the maximum mask value. Pick one CPU
-	 * from each domain to update the MSRs below.
+	 * If we added cpus, remove them from previous group and
+	 * the prev group's child groups that owned them
+	 * and update per-cpu closid/rmid.
 	 */
-	list_for_each_entry(d, &r->domains, list) {
-		hw_dom = resctrl_to_arch_dom(d);
-		cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
-
-		for (i = 0; i < hw_res->num_closid; i++)
-			hw_dom->ctrl_val[i] = r->default_ctrl;
+	cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask);
+	if (!cpumask_empty(tmpmask)) {
+		list_for_each_entry(r, &rdt_all_groups, rdtgroup_list) {
+			if (r == rdtgrp)
+				continue;
+			cpumask_and(tmpmask1, &r->cpu_mask, tmpmask);
+			if (!cpumask_empty(tmpmask1))
+				cpumask_rdtgrp_clear(r, tmpmask1);
+		}
+		update_closid_rmid(tmpmask, rdtgrp);
 	}
 
-	/* Update CBM on all the CPUs in cpu_mask */
-	on_each_cpu_mask(cpu_mask, rdt_ctrl_update, &msr_param, 1);
+	/* Done pushing/pulling - update this group with new mask */
+	cpumask_copy(&rdtgrp->cpu_mask, newmask);
 
-	free_cpumask_var(cpu_mask);
+	/*
+	 * Clear child mon group masks since there is a new parent mask
+	 * now and update the rmid for the cpus the child lost.
+	 */
+	head = &rdtgrp->mon.crdtgrp_list;
+	list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
+		cpumask_and(tmpmask, &rdtgrp->cpu_mask, &crgrp->cpu_mask);
+		update_closid_rmid(tmpmask, rdtgrp);
+		cpumask_clear(&crgrp->cpu_mask);
+	}
 
 	return 0;
 }
 
-void resctrl_arch_reset_resources(void)
+static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of,
+				   char *buf, size_t nbytes, loff_t off)
 {
-	struct rdt_resource *r;
+	cpumask_var_t tmpmask, newmask, tmpmask1;
+	struct rdtgroup *rdtgrp;
+	int ret;
+
+	if (!buf)
+		return -EINVAL;
+
+	if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL))
+		return -ENOMEM;
+	if (!zalloc_cpumask_var(&newmask, GFP_KERNEL)) {
+		free_cpumask_var(tmpmask);
+		return -ENOMEM;
+	}
+	if (!zalloc_cpumask_var(&tmpmask1, GFP_KERNEL)) {
+		free_cpumask_var(tmpmask);
+		free_cpumask_var(newmask);
+		return -ENOMEM;
+	}
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		ret = -ENOENT;
+		goto unlock;
+	}
+
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED ||
+	    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+		ret = -EINVAL;
+		rdt_last_cmd_puts("Pseudo-locking in progress\n");
+		goto unlock;
+	}
+
+	if (is_cpu_list(of))
+		ret = cpulist_parse(buf, newmask);
+	else
+		ret = cpumask_parse(buf, newmask);
+
+	if (ret) {
+		rdt_last_cmd_puts("Bad CPU list/mask\n");
+		goto unlock;
+	}
+
+	/* check that user didn't specify any offline cpus */
+	cpumask_andnot(tmpmask, newmask, cpu_online_mask);
+	if (!cpumask_empty(tmpmask)) {
+		ret = -EINVAL;
+		rdt_last_cmd_puts("Can only assign online CPUs\n");
+		goto unlock;
+	}
+
+	if (rdtgrp->type == RDTCTRL_GROUP)
+		ret = cpus_ctrl_write(rdtgrp, newmask, tmpmask, tmpmask1);
+	else if (rdtgrp->type == RDTMON_GROUP)
+		ret = cpus_mon_write(rdtgrp, newmask, tmpmask);
+	else
+		ret = -EINVAL;
+
+unlock:
+	rdtgroup_kn_unlock(of->kn);
+	free_cpumask_var(tmpmask);
+	free_cpumask_var(newmask);
+	free_cpumask_var(tmpmask1);
+
+	return ret ?: nbytes;
+}
+
+/**
+ * rdtgroup_remove - the helper to remove resource group safely
+ * @rdtgrp: resource group to remove
+ *
+ * On resource group creation via a mkdir, an extra kernfs_node reference is
+ * taken to ensure that the rdtgroup structure remains accessible for the
+ * rdtgroup_kn_unlock() calls where it is removed.
+ *
+ * Drop the extra reference here, then free the rdtgroup structure.
+ *
+ * Return: void
+ */
+static void rdtgroup_remove(struct rdtgroup *rdtgrp)
+{
+	kernfs_put(rdtgrp->kn);
+	kfree(rdtgrp);
+}
+
+static void _update_task_closid_rmid(void *task)
+{
+	/*
+	 * If the task is still current on this CPU, update PQR_ASSOC MSR.
+	 * Otherwise, the MSR is updated when the task is scheduled in.
+	 */
+	if (task == current)
+		resctrl_arch_sched_in(task);
+}
+
+static void update_task_closid_rmid(struct task_struct *t)
+{
+	if (IS_ENABLED(CONFIG_SMP) && task_curr(t))
+		smp_call_function_single(task_cpu(t), _update_task_closid_rmid, t, 1);
+	else
+		_update_task_closid_rmid(t);
+}
+
+static bool task_in_rdtgroup(struct task_struct *tsk, struct rdtgroup *rdtgrp)
+{
+	u32 closid, rmid = rdtgrp->mon.rmid;
+
+	if (rdtgrp->type == RDTCTRL_GROUP)
+		closid = rdtgrp->closid;
+	else if (rdtgrp->type == RDTMON_GROUP)
+		closid = rdtgrp->mon.parent->closid;
+	else
+		return false;
+
+	return resctrl_arch_match_closid(tsk, closid) &&
+	       resctrl_arch_match_rmid(tsk, closid, rmid);
+}
+
+static int __rdtgroup_move_task(struct task_struct *tsk,
+				struct rdtgroup *rdtgrp)
+{
+	/* If the task is already in rdtgrp, no need to move the task. */
+	if (task_in_rdtgroup(tsk, rdtgrp))
+		return 0;
+
+	/*
+	 * Set the task's closid/rmid before the PQR_ASSOC MSR can be
+	 * updated by them.
+	 *
+	 * For ctrl_mon groups, move both closid and rmid.
+	 * For monitor groups, can move the tasks only from
+	 * their parent CTRL group.
+	 */
+	if (rdtgrp->type == RDTMON_GROUP &&
+	    !resctrl_arch_match_closid(tsk, rdtgrp->mon.parent->closid)) {
+		rdt_last_cmd_puts("Can't move task to different control group\n");
+		return -EINVAL;
+	}
+
+	if (rdtgrp->type == RDTMON_GROUP)
+		resctrl_arch_set_closid_rmid(tsk, rdtgrp->mon.parent->closid,
+					     rdtgrp->mon.rmid);
+	else
+		resctrl_arch_set_closid_rmid(tsk, rdtgrp->closid,
+					     rdtgrp->mon.rmid);
+
+	/*
+	 * Ensure the task's closid and rmid are written before determining if
+	 * the task is current that will decide if it will be interrupted.
+	 * This pairs with the full barrier between the rq->curr update and
+	 * resctrl_arch_sched_in() during context switch.
+	 */
+	smp_mb();
+
+	/*
+	 * By now, the task's closid and rmid are set. If the task is current
+	 * on a CPU, the PQR_ASSOC MSR needs to be updated to make the resource
+	 * group go into effect. If the task is not current, the MSR will be
+	 * updated when the task is scheduled in.
+	 */
+	update_task_closid_rmid(tsk);
+
+	return 0;
+}
+
+static bool is_closid_match(struct task_struct *t, struct rdtgroup *r)
+{
+	return (resctrl_arch_alloc_capable() && (r->type == RDTCTRL_GROUP) &&
+		resctrl_arch_match_closid(t, r->closid));
+}
+
+static bool is_rmid_match(struct task_struct *t, struct rdtgroup *r)
+{
+	return (resctrl_arch_mon_capable() && (r->type == RDTMON_GROUP) &&
+		resctrl_arch_match_rmid(t, r->mon.parent->closid,
+					r->mon.rmid));
+}
+
+/**
+ * rdtgroup_tasks_assigned - Test if tasks have been assigned to resource group
+ * @r: Resource group
+ *
+ * Return: 1 if tasks have been assigned to @r, 0 otherwise
+ */
+int rdtgroup_tasks_assigned(struct rdtgroup *r)
+{
+	struct task_struct *p, *t;
+	int ret = 0;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	rcu_read_lock();
+	for_each_process_thread(p, t) {
+		if (is_closid_match(t, r) || is_rmid_match(t, r)) {
+			ret = 1;
+			break;
+		}
+	}
+	rcu_read_unlock();
+
+	return ret;
+}
+
+static int rdtgroup_task_write_permission(struct task_struct *task,
+					  struct kernfs_open_file *of)
+{
+	const struct cred *tcred = get_task_cred(task);
+	const struct cred *cred = current_cred();
+	int ret = 0;
+
+	/*
+	 * Even if we're attaching all tasks in the thread group, we only
+	 * need to check permissions on one of them.
+	 */
+	if (!uid_eq(cred->euid, GLOBAL_ROOT_UID) &&
+	    !uid_eq(cred->euid, tcred->uid) &&
+	    !uid_eq(cred->euid, tcred->suid)) {
+		rdt_last_cmd_printf("No permission to move task %d\n", task->pid);
+		ret = -EPERM;
+	}
+
+	put_cred(tcred);
+	return ret;
+}
+
+static int rdtgroup_move_task(pid_t pid, struct rdtgroup *rdtgrp,
+			      struct kernfs_open_file *of)
+{
+	struct task_struct *tsk;
+	int ret;
+
+	rcu_read_lock();
+	if (pid) {
+		tsk = find_task_by_vpid(pid);
+		if (!tsk) {
+			rcu_read_unlock();
+			rdt_last_cmd_printf("No task %d\n", pid);
+			return -ESRCH;
+		}
+	} else {
+		tsk = current;
+	}
+
+	get_task_struct(tsk);
+	rcu_read_unlock();
+
+	ret = rdtgroup_task_write_permission(tsk, of);
+	if (!ret)
+		ret = __rdtgroup_move_task(tsk, rdtgrp);
+
+	put_task_struct(tsk);
+	return ret;
+}
+
+static ssize_t rdtgroup_tasks_write(struct kernfs_open_file *of,
+				    char *buf, size_t nbytes, loff_t off)
+{
+	struct rdtgroup *rdtgrp;
+	char *pid_str;
+	int ret = 0;
+	pid_t pid;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		rdtgroup_kn_unlock(of->kn);
+		return -ENOENT;
+	}
+	rdt_last_cmd_clear();
+
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED ||
+	    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+		ret = -EINVAL;
+		rdt_last_cmd_puts("Pseudo-locking in progress\n");
+		goto unlock;
+	}
+
+	while (buf && buf[0] != '\0' && buf[0] != '\n') {
+		pid_str = strim(strsep(&buf, ","));
+
+		if (kstrtoint(pid_str, 0, &pid)) {
+			rdt_last_cmd_printf("Task list parsing error pid %s\n", pid_str);
+			ret = -EINVAL;
+			break;
+		}
+
+		if (pid < 0) {
+			rdt_last_cmd_printf("Invalid pid %d\n", pid);
+			ret = -EINVAL;
+			break;
+		}
+
+		ret = rdtgroup_move_task(pid, rdtgrp, of);
+		if (ret) {
+			rdt_last_cmd_printf("Error while processing task %d\n", pid);
+			break;
+		}
+	}
+
+unlock:
+	rdtgroup_kn_unlock(of->kn);
+
+	return ret ?: nbytes;
+}
+
+static void show_rdt_tasks(struct rdtgroup *r, struct seq_file *s)
+{
+	struct task_struct *p, *t;
+	pid_t pid;
+
+	rcu_read_lock();
+	for_each_process_thread(p, t) {
+		if (is_closid_match(t, r) || is_rmid_match(t, r)) {
+			pid = task_pid_vnr(t);
+			if (pid)
+				seq_printf(s, "%d\n", pid);
+		}
+	}
+	rcu_read_unlock();
+}
+
+static int rdtgroup_tasks_show(struct kernfs_open_file *of,
+			       struct seq_file *s, void *v)
+{
+	struct rdtgroup *rdtgrp;
+	int ret = 0;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (rdtgrp)
+		show_rdt_tasks(rdtgrp, s);
+	else
+		ret = -ENOENT;
+	rdtgroup_kn_unlock(of->kn);
+
+	return ret;
+}
+
+static int rdtgroup_closid_show(struct kernfs_open_file *of,
+				struct seq_file *s, void *v)
+{
+	struct rdtgroup *rdtgrp;
+	int ret = 0;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (rdtgrp)
+		seq_printf(s, "%u\n", rdtgrp->closid);
+	else
+		ret = -ENOENT;
+	rdtgroup_kn_unlock(of->kn);
+
+	return ret;
+}
+
+static int rdtgroup_rmid_show(struct kernfs_open_file *of,
+			      struct seq_file *s, void *v)
+{
+	struct rdtgroup *rdtgrp;
+	int ret = 0;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (rdtgrp)
+		seq_printf(s, "%u\n", rdtgrp->mon.rmid);
+	else
+		ret = -ENOENT;
+	rdtgroup_kn_unlock(of->kn);
+
+	return ret;
+}
+
+#ifdef CONFIG_PROC_CPU_RESCTRL
+
+/*
+ * A task can only be part of one resctrl control group and of one monitor
+ * group which is associated to that control group.
+ *
+ * 1)   res:
+ *      mon:
+ *
+ *    resctrl is not available.
+ *
+ * 2)   res:/
+ *      mon:
+ *
+ *    Task is part of the root resctrl control group, and it is not associated
+ *    to any monitor group.
+ *
+ * 3)  res:/
+ *     mon:mon0
+ *
+ *    Task is part of the root resctrl control group and monitor group mon0.
+ *
+ * 4)  res:group0
+ *     mon:
+ *
+ *    Task is part of resctrl control group group0, and it is not associated
+ *    to any monitor group.
+ *
+ * 5) res:group0
+ *    mon:mon1
+ *
+ *    Task is part of resctrl control group group0 and monitor group mon1.
+ */
+int proc_resctrl_show(struct seq_file *s, struct pid_namespace *ns,
+		      struct pid *pid, struct task_struct *tsk)
+{
+	struct rdtgroup *rdtg;
+	int ret = 0;
+
+	mutex_lock(&rdtgroup_mutex);
+
+	/* Return empty if resctrl has not been mounted. */
+	if (!resctrl_mounted) {
+		seq_puts(s, "res:\nmon:\n");
+		goto unlock;
+	}
+
+	list_for_each_entry(rdtg, &rdt_all_groups, rdtgroup_list) {
+		struct rdtgroup *crg;
+
+		/*
+		 * Task information is only relevant for shareable
+		 * and exclusive groups.
+		 */
+		if (rdtg->mode != RDT_MODE_SHAREABLE &&
+		    rdtg->mode != RDT_MODE_EXCLUSIVE)
+			continue;
+
+		if (!resctrl_arch_match_closid(tsk, rdtg->closid))
+			continue;
+
+		seq_printf(s, "res:%s%s\n", (rdtg == &rdtgroup_default) ? "/" : "",
+			   rdtg->kn->name);
+		seq_puts(s, "mon:");
+		list_for_each_entry(crg, &rdtg->mon.crdtgrp_list,
+				    mon.crdtgrp_list) {
+			if (!resctrl_arch_match_rmid(tsk, crg->mon.parent->closid,
+						     crg->mon.rmid))
+				continue;
+			seq_printf(s, "%s", crg->kn->name);
+			break;
+		}
+		seq_putc(s, '\n');
+		goto unlock;
+	}
+	/*
+	 * The above search should succeed. Otherwise return
+	 * with an error.
+	 */
+	ret = -ENOENT;
+unlock:
+	mutex_unlock(&rdtgroup_mutex);
+
+	return ret;
+}
+#endif
+
+static int rdt_last_cmd_status_show(struct kernfs_open_file *of,
+				    struct seq_file *seq, void *v)
+{
+	int len;
+
+	mutex_lock(&rdtgroup_mutex);
+	len = seq_buf_used(&last_cmd_status);
+	if (len)
+		seq_printf(seq, "%.*s", len, last_cmd_status_buf);
+	else
+		seq_puts(seq, "ok\n");
+	mutex_unlock(&rdtgroup_mutex);
+	return 0;
+}
+
+static int rdt_num_closids_show(struct kernfs_open_file *of,
+				struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = of->kn->parent->priv;
+
+	seq_printf(seq, "%u\n", s->num_closid);
+	return 0;
+}
+
+static int rdt_default_ctrl_show(struct kernfs_open_file *of,
+			     struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
+
+	seq_printf(seq, "%x\n", r->default_ctrl);
+	return 0;
+}
+
+static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
+			     struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
+
+	seq_printf(seq, "%u\n", r->cache.min_cbm_bits);
+	return 0;
+}
+
+static int rdt_shareable_bits_show(struct kernfs_open_file *of,
+				   struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
+
+	seq_printf(seq, "%x\n", r->cache.shareable_bits);
+	return 0;
+}
+
+/*
+ * rdt_bit_usage_show - Display current usage of resources
+ *
+ * A domain is a shared resource that can now be allocated differently. Here
+ * we display the current regions of the domain as an annotated bitmask.
+ * For each domain of this resource its allocation bitmask
+ * is annotated as below to indicate the current usage of the corresponding bit:
+ *   0 - currently unused
+ *   X - currently available for sharing and used by software and hardware
+ *   H - currently used by hardware only but available for software use
+ *   S - currently used and shareable by software only
+ *   E - currently used exclusively by one resource group
+ *   P - currently pseudo-locked by one resource group
+ */
+static int rdt_bit_usage_show(struct kernfs_open_file *of,
+			      struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = of->kn->parent->priv;
+	/*
+	 * Use unsigned long even though only 32 bits are used to ensure
+	 * test_bit() is used safely.
+	 */
+	unsigned long sw_shareable = 0, hw_shareable = 0;
+	unsigned long exclusive = 0, pseudo_locked = 0;
+	struct rdt_resource *r = s->res;
+	struct rdt_domain *dom;
+	int i, hwb, swb, excl, psl;
+	enum rdtgrp_mode mode;
+	bool sep = false;
+	u32 ctrl_val;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+	hw_shareable = r->cache.shareable_bits;
+	list_for_each_entry(dom, &r->domains, list) {
+		if (sep)
+			seq_putc(seq, ';');
+		sw_shareable = 0;
+		exclusive = 0;
+		seq_printf(seq, "%d=", dom->id);
+		for (i = 0; i < closids_supported(); i++) {
+			if (!closid_allocated(i))
+				continue;
+			ctrl_val = resctrl_arch_get_config(r, dom, i,
+							   s->conf_type);
+			mode = rdtgroup_mode_by_closid(i);
+			switch (mode) {
+			case RDT_MODE_SHAREABLE:
+				sw_shareable |= ctrl_val;
+				break;
+			case RDT_MODE_EXCLUSIVE:
+				exclusive |= ctrl_val;
+				break;
+			case RDT_MODE_PSEUDO_LOCKSETUP:
+			/*
+			 * RDT_MODE_PSEUDO_LOCKSETUP is possible
+			 * here but not included since the CBM
+			 * associated with this CLOSID in this mode
+			 * is not initialized and no task or cpu can be
+			 * assigned this CLOSID.
+			 */
+				break;
+			case RDT_MODE_PSEUDO_LOCKED:
+			case RDT_NUM_MODES:
+				WARN(1,
+				     "invalid mode for closid %d\n", i);
+				break;
+			}
+		}
+		for (i = r->cache.cbm_len - 1; i >= 0; i--) {
+			pseudo_locked = dom->plr ? dom->plr->cbm : 0;
+			hwb = test_bit(i, &hw_shareable);
+			swb = test_bit(i, &sw_shareable);
+			excl = test_bit(i, &exclusive);
+			psl = test_bit(i, &pseudo_locked);
+			if (hwb && swb)
+				seq_putc(seq, 'X');
+			else if (hwb && !swb)
+				seq_putc(seq, 'H');
+			else if (!hwb && swb)
+				seq_putc(seq, 'S');
+			else if (excl)
+				seq_putc(seq, 'E');
+			else if (psl)
+				seq_putc(seq, 'P');
+			else /* Unused bits remain */
+				seq_putc(seq, '0');
+		}
+		sep = true;
+	}
+	seq_putc(seq, '\n');
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+	return 0;
+}
+
+static int rdt_min_bw_show(struct kernfs_open_file *of,
+			     struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
+
+	seq_printf(seq, "%u\n", r->membw.min_bw);
+	return 0;
+}
+
+static int rdt_num_rmids_show(struct kernfs_open_file *of,
+			      struct seq_file *seq, void *v)
+{
+	struct rdt_resource *r = of->kn->parent->priv;
+
+	seq_printf(seq, "%d\n", r->num_rmid);
+
+	return 0;
+}
+
+static int rdt_mon_features_show(struct kernfs_open_file *of,
+				 struct seq_file *seq, void *v)
+{
+	struct rdt_resource *r = of->kn->parent->priv;
+	struct mon_evt *mevt;
+
+	list_for_each_entry(mevt, &r->evt_list, list) {
+		seq_printf(seq, "%s\n", mevt->name);
+		if (mevt->configurable)
+			seq_printf(seq, "%s_config\n", mevt->name);
+	}
+
+	return 0;
+}
+
+static int rdt_bw_gran_show(struct kernfs_open_file *of,
+			     struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
+
+	seq_printf(seq, "%u\n", r->membw.bw_gran);
+	return 0;
+}
+
+static int rdt_delay_linear_show(struct kernfs_open_file *of,
+			     struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
+
+	seq_printf(seq, "%u\n", r->membw.delay_linear);
+	return 0;
+}
+
+static int max_threshold_occ_show(struct kernfs_open_file *of,
+				  struct seq_file *seq, void *v)
+{
+	seq_printf(seq, "%u\n", resctrl_rmid_realloc_threshold);
+
+	return 0;
+}
+
+static int rdt_thread_throttle_mode_show(struct kernfs_open_file *of,
+					 struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
+
+	if (r->membw.throttle_mode == THREAD_THROTTLE_PER_THREAD)
+		seq_puts(seq, "per-thread\n");
+	else
+		seq_puts(seq, "max\n");
+
+	return 0;
+}
+
+static ssize_t max_threshold_occ_write(struct kernfs_open_file *of,
+				       char *buf, size_t nbytes, loff_t off)
+{
+	unsigned int bytes;
+	int ret;
+
+	ret = kstrtouint(buf, 0, &bytes);
+	if (ret)
+		return ret;
+
+	if (bytes > resctrl_rmid_realloc_limit)
+		return -EINVAL;
+
+	resctrl_rmid_realloc_threshold = resctrl_arch_round_mon_val(bytes);
+
+	return nbytes;
+}
+
+/*
+ * rdtgroup_mode_show - Display mode of this resource group
+ */
+static int rdtgroup_mode_show(struct kernfs_open_file *of,
+			      struct seq_file *s, void *v)
+{
+	struct rdtgroup *rdtgrp;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		rdtgroup_kn_unlock(of->kn);
+		return -ENOENT;
+	}
+
+	seq_printf(s, "%s\n", rdtgroup_mode_str(rdtgrp->mode));
+
+	rdtgroup_kn_unlock(of->kn);
+	return 0;
+}
+
+static enum resctrl_conf_type resctrl_peer_type(enum resctrl_conf_type my_type)
+{
+	switch (my_type) {
+	case CDP_CODE:
+		return CDP_DATA;
+	case CDP_DATA:
+		return CDP_CODE;
+	default:
+	case CDP_NONE:
+		return CDP_NONE;
+	}
+}
+
+static int rdt_has_sparse_bitmasks_show(struct kernfs_open_file *of,
+					struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = of->kn->parent->priv;
+	struct rdt_resource *r = s->res;
+
+	seq_printf(seq, "%u\n", r->cache.arch_has_sparse_bitmasks);
+
+	return 0;
+}
+
+/**
+ * __rdtgroup_cbm_overlaps - Does CBM for intended closid overlap with other
+ * @r: Resource to which domain instance @d belongs.
+ * @d: The domain instance for which @closid is being tested.
+ * @cbm: Capacity bitmask being tested.
+ * @closid: Intended closid for @cbm.
+ * @type: CDP type of @r.
+ * @exclusive: Only check if overlaps with exclusive resource groups
+ *
+ * Checks if provided @cbm intended to be used for @closid on domain
+ * @d overlaps with any other closids or other hardware usage associated
+ * with this domain. If @exclusive is true then only overlaps with
+ * resource groups in exclusive mode will be considered. If @exclusive
+ * is false then overlaps with any resource group or hardware entities
+ * will be considered.
+ *
+ * @cbm is unsigned long, even if only 32 bits are used, to make the
+ * bitmap functions work correctly.
+ *
+ * Return: false if CBM does not overlap, true if it does.
+ */
+static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d,
+				    unsigned long cbm, int closid,
+				    enum resctrl_conf_type type, bool exclusive)
+{
+	enum rdtgrp_mode mode;
+	unsigned long ctrl_b;
+	int i;
+
+	/* Check for any overlap with regions used by hardware directly */
+	if (!exclusive) {
+		ctrl_b = r->cache.shareable_bits;
+		if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len))
+			return true;
+	}
+
+	/* Check for overlap with other resource groups */
+	for (i = 0; i < closids_supported(); i++) {
+		ctrl_b = resctrl_arch_get_config(r, d, i, type);
+		mode = rdtgroup_mode_by_closid(i);
+		if (closid_allocated(i) && i != closid &&
+		    mode != RDT_MODE_PSEUDO_LOCKSETUP) {
+			if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len)) {
+				if (exclusive) {
+					if (mode == RDT_MODE_EXCLUSIVE)
+						return true;
+					continue;
+				}
+				return true;
+			}
+		}
+	}
+
+	return false;
+}
+
+/**
+ * rdtgroup_cbm_overlaps - Does CBM overlap with other use of hardware
+ * @s: Schema for the resource to which domain instance @d belongs.
+ * @d: The domain instance for which @closid is being tested.
+ * @cbm: Capacity bitmask being tested.
+ * @closid: Intended closid for @cbm.
+ * @exclusive: Only check if overlaps with exclusive resource groups
+ *
+ * Resources that can be allocated using a CBM can use the CBM to control
+ * the overlap of these allocations. rdtgroup_cmb_overlaps() is the test
+ * for overlap. Overlap test is not limited to the specific resource for
+ * which the CBM is intended though - when dealing with CDP resources that
+ * share the underlying hardware the overlap check should be performed on
+ * the CDP resource sharing the hardware also.
+ *
+ * Refer to description of __rdtgroup_cbm_overlaps() for the details of the
+ * overlap test.
+ *
+ * Return: true if CBM overlap detected, false if there is no overlap
+ */
+bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
+			   unsigned long cbm, int closid, bool exclusive)
+{
+	enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
+	struct rdt_resource *r = s->res;
+
+	if (__rdtgroup_cbm_overlaps(r, d, cbm, closid, s->conf_type,
+				    exclusive))
+		return true;
+
+	if (!resctrl_arch_get_cdp_enabled(r->rid))
+		return false;
+	return  __rdtgroup_cbm_overlaps(r, d, cbm, closid, peer_type, exclusive);
+}
+
+/**
+ * rdtgroup_mode_test_exclusive - Test if this resource group can be exclusive
+ * @rdtgrp: Resource group identified through its closid.
+ *
+ * An exclusive resource group implies that there should be no sharing of
+ * its allocated resources. At the time this group is considered to be
+ * exclusive this test can determine if its current schemata supports this
+ * setting by testing for overlap with all other resource groups.
+ *
+ * Return: true if resource group can be exclusive, false if there is overlap
+ * with allocations of other resource groups and thus this resource group
+ * cannot be exclusive.
+ */
+static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
+{
+	int closid = rdtgrp->closid;
+	struct resctrl_schema *s;
+	struct rdt_resource *r;
+	bool has_cache = false;
+	struct rdt_domain *d;
+	u32 ctrl;
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		r = s->res;
+		if (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)
+			continue;
+		has_cache = true;
+		list_for_each_entry(d, &r->domains, list) {
+			ctrl = resctrl_arch_get_config(r, d, closid,
+						       s->conf_type);
+			if (rdtgroup_cbm_overlaps(s, d, ctrl, closid, false)) {
+				rdt_last_cmd_puts("Schemata overlaps\n");
+				return false;
+			}
+		}
+	}
+
+	if (!has_cache) {
+		rdt_last_cmd_puts("Cannot be exclusive without CAT/CDP\n");
+		return false;
+	}
+
+	return true;
+}
+
+/*
+ * rdtgroup_mode_write - Modify the resource group's mode
+ */
+static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
+				   char *buf, size_t nbytes, loff_t off)
+{
+	struct rdtgroup *rdtgrp;
+	enum rdtgrp_mode mode;
+	int ret = 0;
+
+	/* Valid input requires a trailing newline */
+	if (nbytes == 0 || buf[nbytes - 1] != '\n')
+		return -EINVAL;
+	buf[nbytes - 1] = '\0';
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		rdtgroup_kn_unlock(of->kn);
+		return -ENOENT;
+	}
+
+	rdt_last_cmd_clear();
+
+	mode = rdtgrp->mode;
+
+	if ((!strcmp(buf, "shareable") && mode == RDT_MODE_SHAREABLE) ||
+	    (!strcmp(buf, "exclusive") && mode == RDT_MODE_EXCLUSIVE) ||
+	    (!strcmp(buf, "pseudo-locksetup") &&
+	     mode == RDT_MODE_PSEUDO_LOCKSETUP) ||
+	    (!strcmp(buf, "pseudo-locked") && mode == RDT_MODE_PSEUDO_LOCKED))
+		goto out;
+
+	if (mode == RDT_MODE_PSEUDO_LOCKED) {
+		rdt_last_cmd_puts("Cannot change pseudo-locked group\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (!strcmp(buf, "shareable")) {
+		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+			ret = rdtgroup_locksetup_exit(rdtgrp);
+			if (ret)
+				goto out;
+		}
+		rdtgrp->mode = RDT_MODE_SHAREABLE;
+	} else if (!strcmp(buf, "exclusive")) {
+		if (!rdtgroup_mode_test_exclusive(rdtgrp)) {
+			ret = -EINVAL;
+			goto out;
+		}
+		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+			ret = rdtgroup_locksetup_exit(rdtgrp);
+			if (ret)
+				goto out;
+		}
+		rdtgrp->mode = RDT_MODE_EXCLUSIVE;
+	} else if (IS_ENABLED(CONFIG_RESCTRL_FS_PSEUDO_LOCK) &&
+		   !strcmp(buf, "pseudo-locksetup")) {
+		ret = rdtgroup_locksetup_enter(rdtgrp);
+		if (ret)
+			goto out;
+		rdtgrp->mode = RDT_MODE_PSEUDO_LOCKSETUP;
+	} else {
+		rdt_last_cmd_puts("Unknown or unsupported mode\n");
+		ret = -EINVAL;
+	}
+
+out:
+	rdtgroup_kn_unlock(of->kn);
+	return ret ?: nbytes;
+}
+
+/**
+ * rdtgroup_cbm_to_size - Translate CBM to size in bytes
+ * @r: RDT resource to which @d belongs.
+ * @d: RDT domain instance.
+ * @cbm: bitmask for which the size should be computed.
+ *
+ * The bitmask provided associated with the RDT domain instance @d will be
+ * translated into how many bytes it represents. The size in bytes is
+ * computed by first dividing the total cache size by the CBM length to
+ * determine how many bytes each bit in the bitmask represents. The result
+ * is multiplied with the number of bits set in the bitmask.
+ *
+ * @cbm is unsigned long, even if only 32 bits are used to make the
+ * bitmap functions work correctly.
+ */
+unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
+				  struct rdt_domain *d, unsigned long cbm)
+{
+	struct cpu_cacheinfo *ci;
+	unsigned int size = 0;
+	int num_b, i;
+
+	num_b = bitmap_weight(&cbm, r->cache.cbm_len);
+	ci = get_cpu_cacheinfo(cpumask_any(&d->cpu_mask));
+	for (i = 0; i < ci->num_leaves; i++) {
+		if (ci->info_list[i].level == r->cache_level) {
+			size = ci->info_list[i].size / r->cache.cbm_len * num_b;
+			break;
+		}
+	}
+
+	return size;
+}
+
+/*
+ * rdtgroup_size_show - Display size in bytes of allocated regions
+ *
+ * The "size" file mirrors the layout of the "schemata" file, printing the
+ * size in bytes of each region instead of the capacity bitmask.
+ */
+static int rdtgroup_size_show(struct kernfs_open_file *of,
+			      struct seq_file *s, void *v)
+{
+	struct resctrl_schema *schema;
+	enum resctrl_conf_type type;
+	struct rdtgroup *rdtgrp;
+	struct rdt_resource *r;
+	struct rdt_domain *d;
+	unsigned int size;
+	int ret = 0;
+	u32 closid;
+	bool sep;
+	u32 ctrl;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		rdtgroup_kn_unlock(of->kn);
+		return -ENOENT;
+	}
+
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+		if (!rdtgrp->plr->d) {
+			rdt_last_cmd_clear();
+			rdt_last_cmd_puts("Cache domain offline\n");
+			ret = -ENODEV;
+		} else {
+			seq_printf(s, "%*s:", max_name_width,
+				   rdtgrp->plr->s->name);
+			size = rdtgroup_cbm_to_size(rdtgrp->plr->s->res,
+						    rdtgrp->plr->d,
+						    rdtgrp->plr->cbm);
+			seq_printf(s, "%d=%u\n", rdtgrp->plr->d->id, size);
+		}
+		goto out;
+	}
+
+	closid = rdtgrp->closid;
+
+	list_for_each_entry(schema, &resctrl_schema_all, list) {
+		r = schema->res;
+		type = schema->conf_type;
+		sep = false;
+		seq_printf(s, "%*s:", max_name_width, schema->name);
+		list_for_each_entry(d, &r->domains, list) {
+			if (sep)
+				seq_putc(s, ';');
+			if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+				size = 0;
+			} else {
+				if (is_mba_sc(r))
+					ctrl = d->mbps_val[closid];
+				else
+					ctrl = resctrl_arch_get_config(r, d,
+								       closid,
+								       type);
+				if (r->rid == RDT_RESOURCE_MBA ||
+				    r->rid == RDT_RESOURCE_SMBA)
+					size = ctrl;
+				else
+					size = rdtgroup_cbm_to_size(r, d, ctrl);
+			}
+			seq_printf(s, "%d=%u", d->id, size);
+			sep = true;
+		}
+		seq_putc(s, '\n');
+	}
+
+out:
+	rdtgroup_kn_unlock(of->kn);
+
+	return ret;
+}
+
+#define INVALID_CONFIG_INDEX   UINT_MAX
+
+/**
+ * mon_event_config_index_get - get the hardware index for the
+ *                              configurable event
+ * @evtid: event id.
+ *
+ * Return: 0 for evtid == QOS_L3_MBM_TOTAL_EVENT_ID
+ *         1 for evtid == QOS_L3_MBM_LOCAL_EVENT_ID
+ *         INVALID_CONFIG_INDEX for invalid evtid
+ */
+static inline unsigned int mon_event_config_index_get(u32 evtid)
+{
+	switch (evtid) {
+	case QOS_L3_MBM_TOTAL_EVENT_ID:
+		return 0;
+	case QOS_L3_MBM_LOCAL_EVENT_ID:
+		return 1;
+	default:
+		/* Should never reach here */
+		return INVALID_CONFIG_INDEX;
+	}
+}
+
+void resctrl_arch_mon_event_config_read(void *info)
+{
+	struct resctrl_mon_config_info *mon_info = info;
+	unsigned int index;
+	u64 msrval;
+
+	index = mon_event_config_index_get(mon_info->evtid);
+	if (index == INVALID_CONFIG_INDEX) {
+		pr_warn_once("Invalid event id %d\n", mon_info->evtid);
+		return;
+	}
+	rdmsrl(MSR_IA32_EVT_CFG_BASE + index, msrval);
+
+	/* Report only the valid event configuration bits */
+	mon_info->mon_config = msrval & MAX_EVT_CONFIG_BITS;
+}
+
+static void mondata_config_read(struct resctrl_mon_config_info *mon_info)
+{
+	smp_call_function_any(&mon_info->d->cpu_mask,
+			      resctrl_arch_mon_event_config_read, mon_info, 1);
+}
+
+static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid)
+{
+	struct resctrl_mon_config_info mon_info = {0};
+	struct rdt_domain *dom;
+	bool sep = false;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	list_for_each_entry(dom, &r->domains, list) {
+		if (sep)
+			seq_puts(s, ";");
+
+		memset(&mon_info, 0, sizeof(struct resctrl_mon_config_info));
+		mon_info.r = r;
+		mon_info.d = dom;
+		mon_info.evtid = evtid;
+		mondata_config_read(&mon_info);
+
+		seq_printf(s, "%d=0x%02x", dom->id, mon_info.mon_config);
+		sep = true;
+	}
+	seq_puts(s, "\n");
+
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+
+	return 0;
+}
+
+static int mbm_total_bytes_config_show(struct kernfs_open_file *of,
+				       struct seq_file *seq, void *v)
+{
+	struct rdt_resource *r = of->kn->parent->priv;
+
+	mbm_config_show(seq, r, QOS_L3_MBM_TOTAL_EVENT_ID);
+
+	return 0;
+}
+
+static int mbm_local_bytes_config_show(struct kernfs_open_file *of,
+				       struct seq_file *seq, void *v)
+{
+	struct rdt_resource *r = of->kn->parent->priv;
+
+	mbm_config_show(seq, r, QOS_L3_MBM_LOCAL_EVENT_ID);
+
+	return 0;
+}
+
+void resctrl_arch_mon_event_config_write(void *info)
+{
+	struct resctrl_mon_config_info *mon_info = info;
+	unsigned int index;
+
+	index = mon_event_config_index_get(mon_info->evtid);
+	if (index == INVALID_CONFIG_INDEX) {
+		pr_warn_once("Invalid event id %d\n", mon_info->evtid);
+		mon_info->err = -EINVAL;
+		return;
+	}
+	wrmsr(MSR_IA32_EVT_CFG_BASE + index, mon_info->mon_config, 0);
+
+	mon_info->err = 0;
+}
+
+static int mbm_config_write_domain(struct rdt_resource *r,
+				   struct rdt_domain *d, u32 evtid, u32 val)
+{
+	struct resctrl_mon_config_info mon_info = {0};
+
+	/*
+	 * Read the current config value first. If both are the same then
+	 * no need to write it again.
+	 */
+	mon_info.r = r;
+	mon_info.d = d;
+	mon_info.evtid = evtid;
+	mondata_config_read(&mon_info);
+	if (mon_info.mon_config == val)
+		return 0;
+
+	mon_info.mon_config = val;
+
+	/*
+	 * Update MSR_IA32_EVT_CFG_BASE MSR on one of the CPUs in the
+	 * domain. The MSRs offset from MSR MSR_IA32_EVT_CFG_BASE
+	 * are scoped at the domain level. Writing any of these MSRs
+	 * on one CPU is observed by all the CPUs in the domain.
+	 */
+	smp_call_function_any(&d->cpu_mask, resctrl_arch_mon_event_config_write,
+			      &mon_info, 1);
+	if (mon_info.err) {
+		rdt_last_cmd_puts("Invalid event configuration\n");
+		return mon_info.err;
+	}
+
+	/*
+	 * When an Event Configuration is changed, the bandwidth counters
+	 * for all RMIDs and Events will be cleared by the hardware. The
+	 * hardware also sets MSR_IA32_QM_CTR.Unavailable (bit 62) for
+	 * every RMID on the next read to any event for every RMID.
+	 * Subsequent reads will have MSR_IA32_QM_CTR.Unavailable (bit 62)
+	 * cleared while it is tracked by the hardware. Clear the
+	 * mbm_local and mbm_total counts for all the RMIDs.
+	 */
+	resctrl_arch_reset_rmid_all(r, d);
+
+	return 0;
+}
+
+static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
+{
+	char *dom_str = NULL, *id_str;
+	unsigned long dom_id, val;
+	struct rdt_domain *d;
+	int err;
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+next:
+	if (!tok || tok[0] == '\0')
+		return 0;
+
+	/* Start processing the strings for each domain */
+	dom_str = strim(strsep(&tok, ";"));
+	id_str = strsep(&dom_str, "=");
+
+	if (!id_str || kstrtoul(id_str, 10, &dom_id)) {
+		rdt_last_cmd_puts("Missing '=' or non-numeric domain id\n");
+		return -EINVAL;
+	}
+
+	if (!dom_str || kstrtoul(dom_str, 16, &val)) {
+		rdt_last_cmd_puts("Non-numeric event configuration value\n");
+		return -EINVAL;
+	}
+
+	/* Value from user cannot be more than the supported set of events */
+	if ((val & r->mbm_cfg_mask) != val) {
+		rdt_last_cmd_printf("Invalid event configuration: max valid mask is 0x%02x\n",
+				    r->mbm_cfg_mask);
+		return -EINVAL;
+	}
+
+	list_for_each_entry(d, &r->domains, list) {
+		if (d->id == dom_id) {
+			err = mbm_config_write_domain(r, d, evtid, val);
+			if (err)
+				return err;
+			goto next;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static ssize_t mbm_total_bytes_config_write(struct kernfs_open_file *of,
+					    char *buf, size_t nbytes,
+					    loff_t off)
+{
+	struct rdt_resource *r = of->kn->parent->priv;
+	int ret;
+
+	/* Valid input requires a trailing newline */
+	if (nbytes == 0 || buf[nbytes - 1] != '\n')
+		return -EINVAL;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	rdt_last_cmd_clear();
+
+	buf[nbytes - 1] = '\0';
+
+	ret = mon_config_write(r, buf, QOS_L3_MBM_TOTAL_EVENT_ID);
+
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+
+	return ret ?: nbytes;
+}
+
+static ssize_t mbm_local_bytes_config_write(struct kernfs_open_file *of,
+					    char *buf, size_t nbytes,
+					    loff_t off)
+{
+	struct rdt_resource *r = of->kn->parent->priv;
+	int ret;
+
+	/* Valid input requires a trailing newline */
+	if (nbytes == 0 || buf[nbytes - 1] != '\n')
+		return -EINVAL;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	rdt_last_cmd_clear();
+
+	buf[nbytes - 1] = '\0';
+
+	ret = mon_config_write(r, buf, QOS_L3_MBM_LOCAL_EVENT_ID);
+
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+
+	return ret ?: nbytes;
+}
+
+/* rdtgroup information files for one cache resource. */
+static struct rftype res_common_files[] = {
+	{
+		.name		= "last_cmd_status",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_last_cmd_status_show,
+		.fflags		= RFTYPE_TOP_INFO,
+	},
+	{
+		.name		= "num_closids",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_num_closids_show,
+		.fflags		= RFTYPE_CTRL_INFO,
+	},
+	{
+		.name		= "mon_features",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_mon_features_show,
+		.fflags		= RFTYPE_MON_INFO,
+	},
+	{
+		.name		= "num_rmids",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_num_rmids_show,
+		.fflags		= RFTYPE_MON_INFO,
+	},
+	{
+		.name		= "cbm_mask",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_default_ctrl_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
+	},
+	{
+		.name		= "min_cbm_bits",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_min_cbm_bits_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
+	},
+	{
+		.name		= "shareable_bits",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_shareable_bits_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
+	},
+	{
+		.name		= "bit_usage",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_bit_usage_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
+	},
+	{
+		.name		= "min_bandwidth",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_min_bw_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
+	},
+	{
+		.name		= "bandwidth_gran",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_bw_gran_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
+	},
+	{
+		.name		= "delay_linear",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_delay_linear_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
+	},
+	/*
+	 * Platform specific which (if any) capabilities are provided by
+	 * thread_throttle_mode. Defer "fflags" initialization to platform
+	 * discovery.
+	 */
+	{
+		.name		= "thread_throttle_mode",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_thread_throttle_mode_show,
+	},
+	{
+		.name		= "max_threshold_occupancy",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.write		= max_threshold_occ_write,
+		.seq_show	= max_threshold_occ_show,
+		.fflags		= RFTYPE_MON_INFO | RFTYPE_RES_CACHE,
+	},
+	{
+		.name		= "mbm_total_bytes_config",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= mbm_total_bytes_config_show,
+		.write		= mbm_total_bytes_config_write,
+	},
+	{
+		.name		= "mbm_local_bytes_config",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= mbm_local_bytes_config_show,
+		.write		= mbm_local_bytes_config_write,
+	},
+	{
+		.name		= "cpus",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.write		= rdtgroup_cpus_write,
+		.seq_show	= rdtgroup_cpus_show,
+		.fflags		= RFTYPE_BASE,
+	},
+	{
+		.name		= "cpus_list",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.write		= rdtgroup_cpus_write,
+		.seq_show	= rdtgroup_cpus_show,
+		.flags		= RFTYPE_FLAGS_CPUS_LIST,
+		.fflags		= RFTYPE_BASE,
+	},
+	{
+		.name		= "tasks",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.write		= rdtgroup_tasks_write,
+		.seq_show	= rdtgroup_tasks_show,
+		.fflags		= RFTYPE_BASE,
+	},
+	{
+		.name		= "mon_hw_id",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdtgroup_rmid_show,
+		.fflags		= RFTYPE_MON_BASE | RFTYPE_DEBUG,
+	},
+	{
+		.name		= "schemata",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.write		= rdtgroup_schemata_write,
+		.seq_show	= rdtgroup_schemata_show,
+		.fflags		= RFTYPE_CTRL_BASE,
+	},
+	{
+		.name		= "mode",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.write		= rdtgroup_mode_write,
+		.seq_show	= rdtgroup_mode_show,
+		.fflags		= RFTYPE_CTRL_BASE,
+	},
+	{
+		.name		= "size",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdtgroup_size_show,
+		.fflags		= RFTYPE_CTRL_BASE,
+	},
+	{
+		.name		= "sparse_masks",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_has_sparse_bitmasks_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
+	},
+	{
+		.name		= "ctrl_hw_id",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdtgroup_closid_show,
+		.fflags		= RFTYPE_CTRL_BASE | RFTYPE_DEBUG,
+	},
+
+};
+
+static int rdtgroup_add_files(struct kernfs_node *kn, unsigned long fflags)
+{
+	struct rftype *rfts, *rft;
+	int ret, len;
+
+	rfts = res_common_files;
+	len = ARRAY_SIZE(res_common_files);
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	if (resctrl_debug)
+		fflags |= RFTYPE_DEBUG;
+
+	for (rft = rfts; rft < rfts + len; rft++) {
+		if (rft->fflags && ((fflags & rft->fflags) == rft->fflags)) {
+			ret = rdtgroup_add_file(kn, rft);
+			if (ret)
+				goto error;
+		}
+	}
+
+	return 0;
+error:
+	pr_warn("Failed to add %s, err=%d\n", rft->name, ret);
+	while (--rft >= rfts) {
+		if ((fflags & rft->fflags) == rft->fflags)
+			kernfs_remove_by_name(kn, rft->name);
+	}
+	return ret;
+}
+
+static struct rftype *rdtgroup_get_rftype_by_name(const char *name)
+{
+	struct rftype *rfts, *rft;
+	int len;
+
+	rfts = res_common_files;
+	len = ARRAY_SIZE(res_common_files);
+
+	for (rft = rfts; rft < rfts + len; rft++) {
+		if (!strcmp(rft->name, name))
+			return rft;
+	}
+
+	return NULL;
+}
+
+static void thread_throttle_mode_init(void)
+{
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+	struct rftype *rft;
+
+	if (!r->alloc_capable ||
+	    r->membw.throttle_mode == THREAD_THROTTLE_UNDEFINED)
+		return;
+
+	rft = rdtgroup_get_rftype_by_name("thread_throttle_mode");
+	if (!rft)
+		return;
+
+	rft->fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_MB;
+}
+
+void mbm_config_rftype_init(const char *config)
+{
+	struct rftype *rft;
+
+	rft = rdtgroup_get_rftype_by_name(config);
+	if (rft)
+		rft->fflags = RFTYPE_MON_INFO | RFTYPE_RES_CACHE;
+}
+
+/**
+ * rdtgroup_kn_mode_restrict - Restrict user access to named resctrl file
+ * @r: The resource group with which the file is associated.
+ * @name: Name of the file
+ *
+ * The permissions of named resctrl file, directory, or link are modified
+ * to not allow read, write, or execute by any user.
+ *
+ * WARNING: This function is intended to communicate to the user that the
+ * resctrl file has been locked down - that it is not relevant to the
+ * particular state the system finds itself in. It should not be relied
+ * on to protect from user access because after the file's permissions
+ * are restricted the user can still change the permissions using chmod
+ * from the command line.
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name)
+{
+	struct iattr iattr = {.ia_valid = ATTR_MODE,};
+	struct kernfs_node *kn;
+	int ret = 0;
+
+	kn = kernfs_find_and_get_ns(r->kn, name, NULL);
+	if (!kn)
+		return -ENOENT;
+
+	switch (kernfs_type(kn)) {
+	case KERNFS_DIR:
+		iattr.ia_mode = S_IFDIR;
+		break;
+	case KERNFS_FILE:
+		iattr.ia_mode = S_IFREG;
+		break;
+	case KERNFS_LINK:
+		iattr.ia_mode = S_IFLNK;
+		break;
+	}
+
+	ret = kernfs_setattr(kn, &iattr);
+	kernfs_put(kn);
+	return ret;
+}
+
+/**
+ * rdtgroup_kn_mode_restore - Restore user access to named resctrl file
+ * @r: The resource group with which the file is associated.
+ * @name: Name of the file
+ * @mask: Mask of permissions that should be restored
+ *
+ * Restore the permissions of the named file. If @name is a directory the
+ * permissions of its parent will be used.
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
+			     umode_t mask)
+{
+	struct iattr iattr = {.ia_valid = ATTR_MODE,};
+	struct kernfs_node *kn, *parent;
+	struct rftype *rfts, *rft;
+	int ret, len;
+
+	rfts = res_common_files;
+	len = ARRAY_SIZE(res_common_files);
+
+	for (rft = rfts; rft < rfts + len; rft++) {
+		if (!strcmp(rft->name, name))
+			iattr.ia_mode = rft->mode & mask;
+	}
+
+	kn = kernfs_find_and_get_ns(r->kn, name, NULL);
+	if (!kn)
+		return -ENOENT;
+
+	switch (kernfs_type(kn)) {
+	case KERNFS_DIR:
+		parent = kernfs_get_parent(kn);
+		if (parent) {
+			iattr.ia_mode |= parent->mode;
+			kernfs_put(parent);
+		}
+		iattr.ia_mode |= S_IFDIR;
+		break;
+	case KERNFS_FILE:
+		iattr.ia_mode |= S_IFREG;
+		break;
+	case KERNFS_LINK:
+		iattr.ia_mode |= S_IFLNK;
+		break;
+	}
+
+	ret = kernfs_setattr(kn, &iattr);
+	kernfs_put(kn);
+	return ret;
+}
+
+static int rdtgroup_mkdir_info_resdir(void *priv, char *name,
+				      unsigned long fflags)
+{
+	struct kernfs_node *kn_subdir;
+	int ret;
+
+	kn_subdir = kernfs_create_dir(kn_info, name,
+				      kn_info->mode, priv);
+	if (IS_ERR(kn_subdir))
+		return PTR_ERR(kn_subdir);
+
+	ret = rdtgroup_kn_set_ugid(kn_subdir);
+	if (ret)
+		return ret;
+
+	ret = rdtgroup_add_files(kn_subdir, fflags);
+	if (!ret)
+		kernfs_activate(kn_subdir);
+
+	return ret;
+}
+
+static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
+{
+	enum resctrl_res_level i;
+	struct resctrl_schema *s;
+	struct rdt_resource *r;
+	unsigned long fflags;
+	char name[32];
+	int ret;
+
+	/* create the directory */
+	kn_info = kernfs_create_dir(parent_kn, "info", parent_kn->mode, NULL);
+	if (IS_ERR(kn_info))
+		return PTR_ERR(kn_info);
+
+	ret = rdtgroup_add_files(kn_info, RFTYPE_TOP_INFO);
+	if (ret)
+		goto out_destroy;
+
+	/* loop over enabled controls, these are all alloc_capable */
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		r = s->res;
+		fflags = r->fflags | RFTYPE_CTRL_INFO;
+		ret = rdtgroup_mkdir_info_resdir(s, s->name, fflags);
+		if (ret)
+			goto out_destroy;
+	}
+
+	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
+		r = resctrl_arch_get_resource(i);
+		if (!r->mon_capable)
+			continue;
+
+		fflags =  r->fflags | RFTYPE_MON_INFO;
+		sprintf(name, "%s_MON", r->name);
+		ret = rdtgroup_mkdir_info_resdir(r, name, fflags);
+		if (ret)
+			goto out_destroy;
+	}
+
+	ret = rdtgroup_kn_set_ugid(kn_info);
+	if (ret)
+		goto out_destroy;
+
+	kernfs_activate(kn_info);
+
+	return 0;
+
+out_destroy:
+	kernfs_remove(kn_info);
+	return ret;
+}
+
+static int
+mongroup_create_dir(struct kernfs_node *parent_kn, struct rdtgroup *prgrp,
+		    char *name, struct kernfs_node **dest_kn)
+{
+	struct kernfs_node *kn;
+	int ret;
+
+	/* create the directory */
+	kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp);
+	if (IS_ERR(kn))
+		return PTR_ERR(kn);
+
+	if (dest_kn)
+		*dest_kn = kn;
+
+	ret = rdtgroup_kn_set_ugid(kn);
+	if (ret)
+		goto out_destroy;
+
+	kernfs_activate(kn);
+
+	return 0;
+
+out_destroy:
+	kernfs_remove(kn);
+	return ret;
+}
+
+static void l3_qos_cfg_update(void *arg)
+{
+	bool *enable = arg;
+
+	wrmsrl(MSR_IA32_L3_QOS_CFG, *enable ? L3_QOS_CDP_ENABLE : 0ULL);
+}
+
+static void l2_qos_cfg_update(void *arg)
+{
+	bool *enable = arg;
+
+	wrmsrl(MSR_IA32_L2_QOS_CFG, *enable ? L2_QOS_CDP_ENABLE : 0ULL);
+}
+
+static inline bool is_mba_linear(void)
+{
+	return resctrl_arch_get_resource(RDT_RESOURCE_MBA)->membw.delay_linear;
+}
+
+static int set_cache_qos_cfg(int level, bool enable)
+{
+	void (*update)(void *arg);
+	struct rdt_resource *r_l;
+	cpumask_var_t cpu_mask;
+	struct rdt_domain *d;
+	int cpu;
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	if (level == RDT_RESOURCE_L3)
+		update = l3_qos_cfg_update;
+	else if (level == RDT_RESOURCE_L2)
+		update = l2_qos_cfg_update;
+	else
+		return -EINVAL;
+
+	if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
+		return -ENOMEM;
+
+	r_l = &rdt_resources_all[level].r_resctrl;
+	list_for_each_entry(d, &r_l->domains, list) {
+		if (r_l->cache.arch_has_per_cpu_cfg)
+			/* Pick all the CPUs in the domain instance */
+			for_each_cpu(cpu, &d->cpu_mask)
+				cpumask_set_cpu(cpu, cpu_mask);
+		else
+			/* Pick one CPU from each domain instance to update MSR */
+			cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
+	}
+
+	/* Update QOS_CFG MSR on all the CPUs in cpu_mask */
+	on_each_cpu_mask(cpu_mask, update, &enable, 1);
+
+	free_cpumask_var(cpu_mask);
+
+	return 0;
+}
+
+/* Restore the qos cfg state when a domain comes online */
+void rdt_domain_reconfigure_cdp(struct rdt_resource *r)
+{
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
+
+	if (!r->cdp_capable)
+		return;
+
+	if (r->rid == RDT_RESOURCE_L2)
+		l2_qos_cfg_update(&hw_res->cdp_enabled);
+
+	if (r->rid == RDT_RESOURCE_L3)
+		l3_qos_cfg_update(&hw_res->cdp_enabled);
+}
+
+static int mba_sc_domain_allocate(struct rdt_resource *r, struct rdt_domain *d)
+{
+	u32 num_closid = resctrl_arch_get_num_closid(r);
+	int cpu = cpumask_any(&d->cpu_mask);
+	int i;
+
+	d->mbps_val = kcalloc_node(num_closid, sizeof(*d->mbps_val),
+				   GFP_KERNEL, cpu_to_node(cpu));
+	if (!d->mbps_val)
+		return -ENOMEM;
+
+	for (i = 0; i < num_closid; i++)
+		d->mbps_val[i] = MBA_MAX_MBPS;
+
+	return 0;
+}
+
+static void mba_sc_domain_destroy(struct rdt_resource *r,
+				  struct rdt_domain *d)
+{
+	kfree(d->mbps_val);
+	d->mbps_val = NULL;
+}
+
+/*
+ * MBA software controller is supported only if
+ * MBM is supported and MBA is in linear scale.
+ */
+static bool supports_mba_mbps(void)
+{
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+
+	return (resctrl_arch_is_mbm_local_enabled() &&
+		r->alloc_capable && is_mba_linear());
+}
+
+/*
+ * Enable or disable the MBA software controller
+ * which helps user specify bandwidth in MBps.
+ */
+static int set_mba_sc(bool mba_sc)
+{
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+	u32 num_closid = resctrl_arch_get_num_closid(r);
+	struct rdt_domain *d;
+	int i;
+
+	if (!supports_mba_mbps() || mba_sc == is_mba_sc(r))
+		return -EINVAL;
+
+	r->membw.mba_sc = mba_sc;
+
+	list_for_each_entry(d, &r->domains, list) {
+		for (i = 0; i < num_closid; i++)
+			d->mbps_val[i] = MBA_MAX_MBPS;
+	}
+
+	return 0;
+}
+
+static int cdp_enable(int level)
+{
+	struct rdt_resource *r_l = &rdt_resources_all[level].r_resctrl;
+	int ret;
+
+	if (!r_l->alloc_capable)
+		return -EINVAL;
+
+	ret = set_cache_qos_cfg(level, true);
+	if (!ret)
+		rdt_resources_all[level].cdp_enabled = true;
+
+	return ret;
+}
+
+static void cdp_disable(int level)
+{
+	struct rdt_hw_resource *r_hw = &rdt_resources_all[level];
+
+	if (r_hw->cdp_enabled) {
+		set_cache_qos_cfg(level, false);
+		r_hw->cdp_enabled = false;
+	}
+}
+
+int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable)
+{
+	struct rdt_hw_resource *hw_res = &rdt_resources_all[l];
+
+	if (!hw_res->r_resctrl.cdp_capable)
+		return -EINVAL;
+
+	if (enable)
+		return cdp_enable(l);
+
+	cdp_disable(l);
+
+	return 0;
+}
+
+/*
+ * We don't allow rdtgroup directories to be created anywhere
+ * except the root directory. Thus when looking for the rdtgroup
+ * structure for a kernfs node we are either looking at a directory,
+ * in which case the rdtgroup structure is pointed at by the "priv"
+ * field, otherwise we have a file, and need only look to the parent
+ * to find the rdtgroup.
+ */
+static struct rdtgroup *kernfs_to_rdtgroup(struct kernfs_node *kn)
+{
+	if (kernfs_type(kn) == KERNFS_DIR) {
+		/*
+		 * All the resource directories use "kn->priv"
+		 * to point to the "struct rdtgroup" for the
+		 * resource. "info" and its subdirectories don't
+		 * have rdtgroup structures, so return NULL here.
+		 */
+		if (kn == kn_info || kn->parent == kn_info)
+			return NULL;
+		else
+			return kn->priv;
+	} else {
+		return kn->parent->priv;
+	}
+}
+
+static void rdtgroup_kn_get(struct rdtgroup *rdtgrp, struct kernfs_node *kn)
+{
+	atomic_inc(&rdtgrp->waitcount);
+	kernfs_break_active_protection(kn);
+}
+
+static void rdtgroup_kn_put(struct rdtgroup *rdtgrp, struct kernfs_node *kn)
+{
+	if (atomic_dec_and_test(&rdtgrp->waitcount) &&
+	    (rdtgrp->flags & RDT_DELETED)) {
+		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
+		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)
+			rdtgroup_pseudo_lock_remove(rdtgrp);
+		kernfs_unbreak_active_protection(kn);
+		rdtgroup_remove(rdtgrp);
+	} else {
+		kernfs_unbreak_active_protection(kn);
+	}
+}
+
+struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn)
+{
+	struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn);
+
+	if (!rdtgrp)
+		return NULL;
+
+	rdtgroup_kn_get(rdtgrp, kn);
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	/* Was this group deleted while we waited? */
+	if (rdtgrp->flags & RDT_DELETED)
+		return NULL;
+
+	return rdtgrp;
+}
+
+void rdtgroup_kn_unlock(struct kernfs_node *kn)
+{
+	struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn);
+
+	if (!rdtgrp)
+		return;
+
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+
+	rdtgroup_kn_put(rdtgrp, kn);
+}
+
+static int mkdir_mondata_all(struct kernfs_node *parent_kn,
+			     struct rdtgroup *prgrp,
+			     struct kernfs_node **mon_data_kn);
+
+static void rdt_disable_ctx(void)
+{
+	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
+	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
+	set_mba_sc(false);
+
+	resctrl_debug = false;
+}
+
+static int rdt_enable_ctx(struct rdt_fs_context *ctx)
+{
+	int ret = 0;
+
+	if (ctx->enable_cdpl2) {
+		ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, true);
+		if (ret)
+			goto out_done;
+	}
+
+	if (ctx->enable_cdpl3) {
+		ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, true);
+		if (ret)
+			goto out_cdpl2;
+	}
+
+	if (ctx->enable_mba_mbps) {
+		ret = set_mba_sc(true);
+		if (ret)
+			goto out_cdpl3;
+	}
+
+	if (ctx->enable_debug)
+		resctrl_debug = true;
+
+	return 0;
+
+out_cdpl3:
+	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
+out_cdpl2:
+	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
+out_done:
+	return ret;
+}
+
+static int schemata_list_add(struct rdt_resource *r, enum resctrl_conf_type type)
+{
+	struct resctrl_schema *s;
+	const char *suffix = "";
+	int ret, cl;
+
+	s = kzalloc(sizeof(*s), GFP_KERNEL);
+	if (!s)
+		return -ENOMEM;
+
+	s->res = r;
+	s->num_closid = resctrl_arch_get_num_closid(r);
+	if (resctrl_arch_get_cdp_enabled(r->rid))
+		s->num_closid /= 2;
+
+	s->conf_type = type;
+	switch (type) {
+	case CDP_CODE:
+		suffix = "CODE";
+		break;
+	case CDP_DATA:
+		suffix = "DATA";
+		break;
+	case CDP_NONE:
+		suffix = "";
+		break;
+	}
+
+	ret = snprintf(s->name, sizeof(s->name), "%s%s", r->name, suffix);
+	if (ret >= sizeof(s->name)) {
+		kfree(s);
+		return -EINVAL;
+	}
+
+	cl = strlen(s->name);
+
+	/*
+	 * If CDP is supported by this resource, but not enabled,
+	 * include the suffix. This ensures the tabular format of the
+	 * schemata file does not change between mounts of the filesystem.
+	 */
+	if (r->cdp_capable && !resctrl_arch_get_cdp_enabled(r->rid))
+		cl += 4;
+
+	if (cl > max_name_width)
+		max_name_width = cl;
+
+	/*
+	 * Choose a width for the resource data based on the resource that has
+	 * widest name and cbm.
+	 */
+	max_data_width = max(max_data_width, r->data_width);
+
+	INIT_LIST_HEAD(&s->list);
+	list_add(&s->list, &resctrl_schema_all);
+
+	return 0;
+}
+
+static int schemata_list_create(void)
+{
+	enum resctrl_res_level i;
+	struct rdt_resource *r;
+	int ret = 0;
+
+	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
+		r = resctrl_arch_get_resource(i);
+		if (!r->alloc_capable)
+			continue;
+
+		if (resctrl_arch_get_cdp_enabled(r->rid)) {
+			ret = schemata_list_add(r, CDP_CODE);
+			if (ret)
+				break;
+
+			ret = schemata_list_add(r, CDP_DATA);
+		} else {
+			ret = schemata_list_add(r, CDP_NONE);
+		}
+
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+static void schemata_list_destroy(void)
+{
+	struct resctrl_schema *s, *tmp;
+
+	list_for_each_entry_safe(s, tmp, &resctrl_schema_all, list) {
+		list_del(&s->list);
+		kfree(s);
+	}
+}
+
+static int rdt_get_tree(struct fs_context *fc)
+{
+	struct rdt_resource *l3 = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	struct rdt_fs_context *ctx = rdt_fc2context(fc);
+	unsigned long flags = RFTYPE_CTRL_BASE;
+	struct rdt_domain *dom;
+	int ret;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+	/*
+	 * resctrl file system can only be mounted once.
+	 */
+	if (resctrl_mounted) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	ret = rdtgroup_setup_root(ctx);
+	if (ret)
+		goto out;
+
+	ret = rdt_enable_ctx(ctx);
+	if (ret)
+		goto out_root;
+
+	ret = schemata_list_create();
+	if (ret) {
+		schemata_list_destroy();
+		goto out_ctx;
+	}
+
+	closid_init();
+
+	if (resctrl_arch_mon_capable())
+		flags |= RFTYPE_MON;
+
+	ret = rdtgroup_add_files(rdtgroup_default.kn, flags);
+	if (ret)
+		goto out_schemata_free;
+
+	kernfs_activate(rdtgroup_default.kn);
+
+	ret = rdtgroup_create_info_dir(rdtgroup_default.kn);
+	if (ret < 0)
+		goto out_schemata_free;
+
+	if (resctrl_arch_mon_capable()) {
+		ret = mongroup_create_dir(rdtgroup_default.kn,
+					  &rdtgroup_default, "mon_groups",
+					  &kn_mongrp);
+		if (ret < 0)
+			goto out_info;
+
+		ret = mkdir_mondata_all(rdtgroup_default.kn,
+					&rdtgroup_default, &kn_mondata);
+		if (ret < 0)
+			goto out_mongrp;
+		rdtgroup_default.mon.mon_data_kn = kn_mondata;
+	}
+
+	ret = rdt_pseudo_lock_init();
+	if (ret)
+		goto out_mondata;
+
+	ret = kernfs_get_tree(fc);
+	if (ret < 0)
+		goto out_psl;
+
+	if (resctrl_arch_alloc_capable())
+		resctrl_arch_enable_alloc();
+	if (resctrl_arch_mon_capable())
+		resctrl_arch_enable_mon();
+
+	if (resctrl_arch_alloc_capable() || resctrl_arch_mon_capable())
+		resctrl_mounted = true;
+
+	if (resctrl_is_mbm_enabled()) {
+		list_for_each_entry(dom, &l3->domains, list)
+			mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL,
+						   RESCTRL_PICK_ANY_CPU);
+	}
+
+	goto out;
+
+out_psl:
+	rdt_pseudo_lock_release();
+out_mondata:
+	if (resctrl_arch_mon_capable())
+		kernfs_remove(kn_mondata);
+out_mongrp:
+	if (resctrl_arch_mon_capable())
+		kernfs_remove(kn_mongrp);
+out_info:
+	kernfs_remove(kn_info);
+out_schemata_free:
+	schemata_list_destroy();
+out_ctx:
+	rdt_disable_ctx();
+out_root:
+	rdtgroup_destroy_root();
+out:
+	rdt_last_cmd_clear();
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+	return ret;
+}
+
+enum rdt_param {
+	Opt_cdp,
+	Opt_cdpl2,
+	Opt_mba_mbps,
+	Opt_debug,
+	nr__rdt_params
+};
+
+static const struct fs_parameter_spec rdt_fs_parameters[] = {
+	fsparam_flag("cdp",		Opt_cdp),
+	fsparam_flag("cdpl2",		Opt_cdpl2),
+	fsparam_flag("mba_MBps",	Opt_mba_mbps),
+	fsparam_flag("debug",		Opt_debug),
+	{}
+};
+
+static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+	struct rdt_fs_context *ctx = rdt_fc2context(fc);
+	struct fs_parse_result result;
+	int opt;
+
+	opt = fs_parse(fc, rdt_fs_parameters, param, &result);
+	if (opt < 0)
+		return opt;
+
+	switch (opt) {
+	case Opt_cdp:
+		ctx->enable_cdpl3 = true;
+		return 0;
+	case Opt_cdpl2:
+		ctx->enable_cdpl2 = true;
+		return 0;
+	case Opt_mba_mbps:
+		if (!supports_mba_mbps())
+			return -EINVAL;
+		ctx->enable_mba_mbps = true;
+		return 0;
+	case Opt_debug:
+		ctx->enable_debug = true;
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static void rdt_fs_context_free(struct fs_context *fc)
+{
+	struct rdt_fs_context *ctx = rdt_fc2context(fc);
+
+	kernfs_free_fs_context(fc);
+	kfree(ctx);
+}
+
+static const struct fs_context_operations rdt_fs_context_ops = {
+	.free		= rdt_fs_context_free,
+	.parse_param	= rdt_parse_param,
+	.get_tree	= rdt_get_tree,
+};
+
+static int rdt_init_fs_context(struct fs_context *fc)
+{
+	struct rdt_fs_context *ctx;
+
+	ctx = kzalloc(sizeof(struct rdt_fs_context), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->kfc.magic = RDTGROUP_SUPER_MAGIC;
+	fc->fs_private = &ctx->kfc;
+	fc->ops = &rdt_fs_context_ops;
+	put_user_ns(fc->user_ns);
+	fc->user_ns = get_user_ns(&init_user_ns);
+	fc->global = true;
+	return 0;
+}
+
+static int reset_all_ctrls(struct rdt_resource *r)
+{
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
+	struct rdt_hw_domain *hw_dom;
+	struct msr_param msr_param;
+	cpumask_var_t cpu_mask;
+	struct rdt_domain *d;
+	int i;
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
+		return -ENOMEM;
+
+	msr_param.res = r;
+	msr_param.low = 0;
+	msr_param.high = hw_res->num_closid;
+
+	/*
+	 * Disable resource control for this resource by setting all
+	 * CBMs in all domains to the maximum mask value. Pick one CPU
+	 * from each domain to update the MSRs below.
+	 */
+	list_for_each_entry(d, &r->domains, list) {
+		hw_dom = resctrl_to_arch_dom(d);
+		cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
+
+		for (i = 0; i < hw_res->num_closid; i++)
+			hw_dom->ctrl_val[i] = r->default_ctrl;
+	}
+
+	/* Update CBM on all the CPUs in cpu_mask */
+	on_each_cpu_mask(cpu_mask, rdt_ctrl_update, &msr_param, 1);
+
+	free_cpumask_var(cpu_mask);
+
+	return 0;
+}
+
+void resctrl_arch_reset_resources(void)
+{
+	struct rdt_resource *r;
 
 	for_each_capable_rdt_resource(r)
 		reset_all_ctrls(r);
 }
+
+/*
+ * Move tasks from one to the other group. If @from is NULL, then all tasks
+ * in the systems are moved unconditionally (used for teardown).
+ *
+ * If @mask is not NULL the cpus on which moved tasks are running are set
+ * in that mask so the update smp function call is restricted to affected
+ * cpus.
+ */
+static void rdt_move_group_tasks(struct rdtgroup *from, struct rdtgroup *to,
+				 struct cpumask *mask)
+{
+	struct task_struct *p, *t;
+
+	read_lock(&tasklist_lock);
+	for_each_process_thread(p, t) {
+		if (!from || is_closid_match(t, from) ||
+		    is_rmid_match(t, from)) {
+			resctrl_arch_set_closid_rmid(t, to->closid,
+						     to->mon.rmid);
+
+			/*
+			 * Order the closid/rmid stores above before the loads
+			 * in task_curr(). This pairs with the full barrier
+			 * between the rq->curr update and
+			 * resctrl_arch_sched_in() during context switch.
+			 */
+			smp_mb();
+
+			/*
+			 * If the task is on a CPU, set the CPU in the mask.
+			 * The detection is inaccurate as tasks might move or
+			 * schedule before the smp function call takes place.
+			 * In such a case the function call is pointless, but
+			 * there is no other side effect.
+			 */
+			if (IS_ENABLED(CONFIG_SMP) && mask && task_curr(t))
+				cpumask_set_cpu(task_cpu(t), mask);
+		}
+	}
+	read_unlock(&tasklist_lock);
+}
+
+static void free_all_child_rdtgrp(struct rdtgroup *rdtgrp)
+{
+	struct rdtgroup *sentry, *stmp;
+	struct list_head *head;
+
+	head = &rdtgrp->mon.crdtgrp_list;
+	list_for_each_entry_safe(sentry, stmp, head, mon.crdtgrp_list) {
+		free_rmid(sentry->closid, sentry->mon.rmid);
+		list_del(&sentry->mon.crdtgrp_list);
+
+		if (atomic_read(&sentry->waitcount) != 0)
+			sentry->flags = RDT_DELETED;
+		else
+			rdtgroup_remove(sentry);
+	}
+}
+
+/*
+ * Forcibly remove all of subdirectories under root.
+ */
+static void rmdir_all_sub(void)
+{
+	struct rdtgroup *rdtgrp, *tmp;
+
+	/* Move all tasks to the default resource group */
+	rdt_move_group_tasks(NULL, &rdtgroup_default, NULL);
+
+	list_for_each_entry_safe(rdtgrp, tmp, &rdt_all_groups, rdtgroup_list) {
+		/* Free any child rmids */
+		free_all_child_rdtgrp(rdtgrp);
+
+		/* Remove each rdtgroup other than root */
+		if (rdtgrp == &rdtgroup_default)
+			continue;
+
+		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
+		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)
+			rdtgroup_pseudo_lock_remove(rdtgrp);
+
+		/*
+		 * Give any CPUs back to the default group. We cannot copy
+		 * cpu_online_mask because a CPU might have executed the
+		 * offline callback already, but is still marked online.
+		 */
+		cpumask_or(&rdtgroup_default.cpu_mask,
+			   &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);
+
+		free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+
+		kernfs_remove(rdtgrp->kn);
+		list_del(&rdtgrp->rdtgroup_list);
+
+		if (atomic_read(&rdtgrp->waitcount) != 0)
+			rdtgrp->flags = RDT_DELETED;
+		else
+			rdtgroup_remove(rdtgrp);
+	}
+	/* Notify online CPUs to update per cpu storage and PQR_ASSOC MSR */
+	update_closid_rmid(cpu_online_mask, &rdtgroup_default);
+
+	kernfs_remove(kn_info);
+	kernfs_remove(kn_mongrp);
+	kernfs_remove(kn_mondata);
+}
+
+static void rdt_kill_sb(struct super_block *sb)
+{
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	rdt_disable_ctx();
+
+	/* Put everything back to default values. */
+	resctrl_arch_reset_resources();
+
+	rmdir_all_sub();
+	rdt_pseudo_lock_release();
+	rdtgroup_default.mode = RDT_MODE_SHAREABLE;
+	schemata_list_destroy();
+	rdtgroup_destroy_root();
+	if (resctrl_arch_alloc_capable())
+		resctrl_arch_disable_alloc();
+	if (resctrl_arch_mon_capable())
+		resctrl_arch_disable_mon();
+	resctrl_mounted = false;
+	kernfs_kill_sb(sb);
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+}
+
+static struct file_system_type rdt_fs_type = {
+	.name			= "resctrl",
+	.init_fs_context	= rdt_init_fs_context,
+	.parameters		= rdt_fs_parameters,
+	.kill_sb		= rdt_kill_sb,
+};
+
+static int mon_addfile(struct kernfs_node *parent_kn, const char *name,
+		       void *priv)
+{
+	struct kernfs_node *kn;
+	int ret = 0;
+
+	kn = __kernfs_create_file(parent_kn, name, 0444,
+				  GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, 0,
+				  &kf_mondata_ops, priv, NULL, NULL);
+	if (IS_ERR(kn))
+		return PTR_ERR(kn);
+
+	ret = rdtgroup_kn_set_ugid(kn);
+	if (ret) {
+		kernfs_remove(kn);
+		return ret;
+	}
+
+	return ret;
+}
+
+/*
+ * Remove all subdirectories of mon_data of ctrl_mon groups
+ * and monitor groups with given domain id.
+ */
+static void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
+					   unsigned int dom_id)
+{
+	struct rdtgroup *prgrp, *crgrp;
+	char name[32];
+
+	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
+		sprintf(name, "mon_%s_%02d", r->name, dom_id);
+		kernfs_remove_by_name(prgrp->mon.mon_data_kn, name);
+
+		list_for_each_entry(crgrp, &prgrp->mon.crdtgrp_list, mon.crdtgrp_list)
+			kernfs_remove_by_name(crgrp->mon.mon_data_kn, name);
+	}
+}
+
+static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
+				struct rdt_domain *d,
+				struct rdt_resource *r, struct rdtgroup *prgrp)
+{
+	union mon_data_bits priv;
+	struct kernfs_node *kn;
+	struct mon_evt *mevt;
+	struct rmid_read rr;
+	char name[32];
+	int ret;
+
+	sprintf(name, "mon_%s_%02d", r->name, d->id);
+	/* create the directory */
+	kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp);
+	if (IS_ERR(kn))
+		return PTR_ERR(kn);
+
+	ret = rdtgroup_kn_set_ugid(kn);
+	if (ret)
+		goto out_destroy;
+
+	if (WARN_ON(list_empty(&r->evt_list))) {
+		ret = -EPERM;
+		goto out_destroy;
+	}
+
+	priv.u.rid = r->rid;
+	priv.u.domid = d->id;
+	list_for_each_entry(mevt, &r->evt_list, list) {
+		priv.u.evtid = mevt->evtid;
+		ret = mon_addfile(kn, mevt->name, priv.priv);
+		if (ret)
+			goto out_destroy;
+
+		if (resctrl_is_mbm_event(mevt->evtid))
+			mon_event_read(&rr, r, d, prgrp, mevt->evtid, true);
+	}
+	kernfs_activate(kn);
+	return 0;
+
+out_destroy:
+	kernfs_remove(kn);
+	return ret;
+}
+
+/*
+ * Add all subdirectories of mon_data for "ctrl_mon" groups
+ * and "monitor" groups with given domain id.
+ */
+static void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
+					   struct rdt_domain *d)
+{
+	struct kernfs_node *parent_kn;
+	struct rdtgroup *prgrp, *crgrp;
+	struct list_head *head;
+
+	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
+		parent_kn = prgrp->mon.mon_data_kn;
+		mkdir_mondata_subdir(parent_kn, d, r, prgrp);
+
+		head = &prgrp->mon.crdtgrp_list;
+		list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
+			parent_kn = crgrp->mon.mon_data_kn;
+			mkdir_mondata_subdir(parent_kn, d, r, crgrp);
+		}
+	}
+}
+
+static int mkdir_mondata_subdir_alldom(struct kernfs_node *parent_kn,
+				       struct rdt_resource *r,
+				       struct rdtgroup *prgrp)
+{
+	struct rdt_domain *dom;
+	int ret;
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	list_for_each_entry(dom, &r->domains, list) {
+		ret = mkdir_mondata_subdir(parent_kn, dom, r, prgrp);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+/*
+ * This creates a directory mon_data which contains the monitored data.
+ *
+ * mon_data has one directory for each domain which are named
+ * in the format mon_<domain_name>_<domain_id>. For ex: A mon_data
+ * with L3 domain looks as below:
+ * ./mon_data:
+ * mon_L3_00
+ * mon_L3_01
+ * mon_L3_02
+ * ...
+ *
+ * Each domain directory has one file per event:
+ * ./mon_L3_00/:
+ * llc_occupancy
+ *
+ */
+static int mkdir_mondata_all(struct kernfs_node *parent_kn,
+			     struct rdtgroup *prgrp,
+			     struct kernfs_node **dest_kn)
+{
+	enum resctrl_res_level i;
+	struct rdt_resource *r;
+	struct kernfs_node *kn;
+	int ret;
+
+	/*
+	 * Create the mon_data directory first.
+	 */
+	ret = mongroup_create_dir(parent_kn, prgrp, "mon_data", &kn);
+	if (ret)
+		return ret;
+
+	if (dest_kn)
+		*dest_kn = kn;
+
+	/*
+	 * Create the subdirectories for each domain. Note that all events
+	 * in a domain like L3 are grouped into a resource whose domain is L3
+	 */
+	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
+		r = resctrl_arch_get_resource(i);
+		if (!r->mon_capable)
+			continue;
+
+		ret = mkdir_mondata_subdir_alldom(kn, r, prgrp);
+		if (ret)
+			goto out_destroy;
+	}
+
+	return 0;
+
+out_destroy:
+	kernfs_remove(kn);
+	return ret;
+}
+
+/**
+ * cbm_ensure_valid - Enforce validity on provided CBM
+ * @_val:	Candidate CBM
+ * @r:		RDT resource to which the CBM belongs
+ *
+ * The provided CBM represents all cache portions available for use. This
+ * may be represented by a bitmap that does not consist of contiguous ones
+ * and thus be an invalid CBM.
+ * Here the provided CBM is forced to be a valid CBM by only considering
+ * the first set of contiguous bits as valid and clearing all bits.
+ * The intention here is to provide a valid default CBM with which a new
+ * resource group is initialized. The user can follow this with a
+ * modification to the CBM if the default does not satisfy the
+ * requirements.
+ */
+static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
+{
+	unsigned int cbm_len = r->cache.cbm_len;
+	unsigned long first_bit, zero_bit;
+	unsigned long val = _val;
+
+	if (!val)
+		return 0;
+
+	first_bit = find_first_bit(&val, cbm_len);
+	zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
+
+	/* Clear any remaining bits to ensure contiguous region */
+	bitmap_clear(&val, zero_bit, cbm_len - zero_bit);
+	return (u32)val;
+}
+
+/*
+ * Initialize cache resources per RDT domain
+ *
+ * Set the RDT domain up to start off with all usable allocations. That is,
+ * all shareable and unused bits. All-zero CBM is invalid.
+ */
+static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
+				 u32 closid)
+{
+	enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
+	enum resctrl_conf_type t = s->conf_type;
+	struct resctrl_staged_config *cfg;
+	struct rdt_resource *r = s->res;
+	u32 used_b = 0, unused_b = 0;
+	unsigned long tmp_cbm;
+	enum rdtgrp_mode mode;
+	u32 peer_ctl, ctrl_val;
+	int i;
+
+	cfg = &d->staged_config[t];
+	cfg->have_new_ctrl = false;
+	cfg->new_ctrl = r->cache.shareable_bits;
+	used_b = r->cache.shareable_bits;
+	for (i = 0; i < closids_supported(); i++) {
+		if (closid_allocated(i) && i != closid) {
+			mode = rdtgroup_mode_by_closid(i);
+			if (mode == RDT_MODE_PSEUDO_LOCKSETUP)
+				/*
+				 * ctrl values for locksetup aren't relevant
+				 * until the schemata is written, and the mode
+				 * becomes RDT_MODE_PSEUDO_LOCKED.
+				 */
+				continue;
+			/*
+			 * If CDP is active include peer domain's
+			 * usage to ensure there is no overlap
+			 * with an exclusive group.
+			 */
+			if (resctrl_arch_get_cdp_enabled(r->rid))
+				peer_ctl = resctrl_arch_get_config(r, d, i,
+								   peer_type);
+			else
+				peer_ctl = 0;
+			ctrl_val = resctrl_arch_get_config(r, d, i,
+							   s->conf_type);
+			used_b |= ctrl_val | peer_ctl;
+			if (mode == RDT_MODE_SHAREABLE)
+				cfg->new_ctrl |= ctrl_val | peer_ctl;
+		}
+	}
+	if (d->plr && d->plr->cbm > 0)
+		used_b |= d->plr->cbm;
+	unused_b = used_b ^ (BIT_MASK(r->cache.cbm_len) - 1);
+	unused_b &= BIT_MASK(r->cache.cbm_len) - 1;
+	cfg->new_ctrl |= unused_b;
+	/*
+	 * Force the initial CBM to be valid, user can
+	 * modify the CBM based on system availability.
+	 */
+	cfg->new_ctrl = cbm_ensure_valid(cfg->new_ctrl, r);
+	/*
+	 * Assign the u32 CBM to an unsigned long to ensure that
+	 * bitmap_weight() does not access out-of-bound memory.
+	 */
+	tmp_cbm = cfg->new_ctrl;
+	if (bitmap_weight(&tmp_cbm, r->cache.cbm_len) < r->cache.min_cbm_bits) {
+		rdt_last_cmd_printf("No space on %s:%d\n", s->name, d->id);
+		return -ENOSPC;
+	}
+	cfg->have_new_ctrl = true;
+
+	return 0;
+}
+
+/*
+ * Initialize cache resources with default values.
+ *
+ * A new RDT group is being created on an allocation capable (CAT)
+ * supporting system. Set this group up to start off with all usable
+ * allocations.
+ *
+ * If there are no more shareable bits available on any domain then
+ * the entire allocation will fail.
+ */
+static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
+{
+	struct rdt_domain *d;
+	int ret;
+
+	list_for_each_entry(d, &s->res->domains, list) {
+		ret = __init_one_rdt_domain(d, s, closid);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+/* Initialize MBA resource with default values. */
+static void rdtgroup_init_mba(struct rdt_resource *r, u32 closid)
+{
+	struct resctrl_staged_config *cfg;
+	struct rdt_domain *d;
+
+	list_for_each_entry(d, &r->domains, list) {
+		if (is_mba_sc(r)) {
+			d->mbps_val[closid] = MBA_MAX_MBPS;
+			continue;
+		}
+
+		cfg = &d->staged_config[CDP_NONE];
+		cfg->new_ctrl = r->default_ctrl;
+		cfg->have_new_ctrl = true;
+	}
+}
+
+/* Initialize the RDT group's allocations. */
+static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
+{
+	struct resctrl_schema *s;
+	struct rdt_resource *r;
+	int ret = 0;
+
+	rdt_staged_configs_clear();
+
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		r = s->res;
+		if (r->rid == RDT_RESOURCE_MBA ||
+		    r->rid == RDT_RESOURCE_SMBA) {
+			rdtgroup_init_mba(r, rdtgrp->closid);
+			if (is_mba_sc(r))
+				continue;
+		} else {
+			ret = rdtgroup_init_cat(s, rdtgrp->closid);
+			if (ret < 0)
+				goto out;
+		}
+
+		ret = resctrl_arch_update_domains(r, rdtgrp->closid);
+		if (ret < 0) {
+			rdt_last_cmd_puts("Failed to initialize allocations\n");
+			goto out;
+		}
+
+	}
+
+	rdtgrp->mode = RDT_MODE_SHAREABLE;
+
+out:
+	rdt_staged_configs_clear();
+	return ret;
+}
+
+static int mkdir_rdt_prepare_rmid_alloc(struct rdtgroup *rdtgrp)
+{
+	int ret;
+
+	if (!resctrl_arch_mon_capable())
+		return 0;
+
+	ret = alloc_rmid(rdtgrp->closid);
+	if (ret < 0) {
+		rdt_last_cmd_puts("Out of RMIDs\n");
+		return ret;
+	}
+	rdtgrp->mon.rmid = ret;
+
+	ret = mkdir_mondata_all(rdtgrp->kn, rdtgrp, &rdtgrp->mon.mon_data_kn);
+	if (ret) {
+		rdt_last_cmd_puts("kernfs subdir error\n");
+		free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void mkdir_rdt_prepare_rmid_free(struct rdtgroup *rgrp)
+{
+	if (resctrl_arch_mon_capable())
+		free_rmid(rgrp->closid, rgrp->mon.rmid);
+}
+
+static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
+			     const char *name, umode_t mode,
+			     enum rdt_group_type rtype, struct rdtgroup **r)
+{
+	struct rdtgroup *prdtgrp, *rdtgrp;
+	unsigned long files = 0;
+	struct kernfs_node *kn;
+	int ret;
+
+	prdtgrp = rdtgroup_kn_lock_live(parent_kn);
+	if (!prdtgrp) {
+		ret = -ENODEV;
+		goto out_unlock;
+	}
+
+	if (rtype == RDTMON_GROUP &&
+	    (prdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
+	     prdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)) {
+		ret = -EINVAL;
+		rdt_last_cmd_puts("Pseudo-locking in progress\n");
+		goto out_unlock;
+	}
+
+	/* allocate the rdtgroup. */
+	rdtgrp = kzalloc(sizeof(*rdtgrp), GFP_KERNEL);
+	if (!rdtgrp) {
+		ret = -ENOSPC;
+		rdt_last_cmd_puts("Kernel out of memory\n");
+		goto out_unlock;
+	}
+	*r = rdtgrp;
+	rdtgrp->mon.parent = prdtgrp;
+	rdtgrp->type = rtype;
+	INIT_LIST_HEAD(&rdtgrp->mon.crdtgrp_list);
+
+	/* kernfs creates the directory for rdtgrp */
+	kn = kernfs_create_dir(parent_kn, name, mode, rdtgrp);
+	if (IS_ERR(kn)) {
+		ret = PTR_ERR(kn);
+		rdt_last_cmd_puts("kernfs create error\n");
+		goto out_free_rgrp;
+	}
+	rdtgrp->kn = kn;
+
+	/*
+	 * kernfs_remove() will drop the reference count on "kn" which
+	 * will free it. But we still need it to stick around for the
+	 * rdtgroup_kn_unlock(kn) call. Take one extra reference here,
+	 * which will be dropped by kernfs_put() in rdtgroup_remove().
+	 */
+	kernfs_get(kn);
+
+	ret = rdtgroup_kn_set_ugid(kn);
+	if (ret) {
+		rdt_last_cmd_puts("kernfs perm error\n");
+		goto out_destroy;
+	}
+
+	if (rtype == RDTCTRL_GROUP) {
+		files = RFTYPE_BASE | RFTYPE_CTRL;
+		if (resctrl_arch_mon_capable())
+			files |= RFTYPE_MON;
+	} else {
+		files = RFTYPE_BASE | RFTYPE_MON;
+	}
+
+	ret = rdtgroup_add_files(kn, files);
+	if (ret) {
+		rdt_last_cmd_puts("kernfs fill error\n");
+		goto out_destroy;
+	}
+
+	/*
+	 * The caller unlocks the parent_kn upon success.
+	 */
+	return 0;
+
+out_destroy:
+	kernfs_put(rdtgrp->kn);
+	kernfs_remove(rdtgrp->kn);
+out_free_rgrp:
+	kfree(rdtgrp);
+out_unlock:
+	rdtgroup_kn_unlock(parent_kn);
+	return ret;
+}
+
+static void mkdir_rdt_prepare_clean(struct rdtgroup *rgrp)
+{
+	kernfs_remove(rgrp->kn);
+	rdtgroup_remove(rgrp);
+}
+
+/*
+ * Create a monitor group under "mon_groups" directory of a control
+ * and monitor group(ctrl_mon). This is a resource group
+ * to monitor a subset of tasks and cpus in its parent ctrl_mon group.
+ */
+static int rdtgroup_mkdir_mon(struct kernfs_node *parent_kn,
+			      const char *name, umode_t mode)
+{
+	struct rdtgroup *rdtgrp, *prgrp;
+	int ret;
+
+	ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTMON_GROUP, &rdtgrp);
+	if (ret)
+		return ret;
+
+	prgrp = rdtgrp->mon.parent;
+	rdtgrp->closid = prgrp->closid;
+
+	ret = mkdir_rdt_prepare_rmid_alloc(rdtgrp);
+	if (ret) {
+		mkdir_rdt_prepare_clean(rdtgrp);
+		goto out_unlock;
+	}
+
+	kernfs_activate(rdtgrp->kn);
+
+	/*
+	 * Add the rdtgrp to the list of rdtgrps the parent
+	 * ctrl_mon group has to track.
+	 */
+	list_add_tail(&rdtgrp->mon.crdtgrp_list, &prgrp->mon.crdtgrp_list);
+
+out_unlock:
+	rdtgroup_kn_unlock(parent_kn);
+	return ret;
+}
+
+/*
+ * These are rdtgroups created under the root directory. Can be used
+ * to allocate and monitor resources.
+ */
+static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn,
+				   const char *name, umode_t mode)
+{
+	struct rdtgroup *rdtgrp;
+	struct kernfs_node *kn;
+	u32 closid;
+	int ret;
+
+	ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTCTRL_GROUP, &rdtgrp);
+	if (ret)
+		return ret;
+
+	kn = rdtgrp->kn;
+	ret = closid_alloc();
+	if (ret < 0) {
+		rdt_last_cmd_puts("Out of CLOSIDs\n");
+		goto out_common_fail;
+	}
+	closid = ret;
+	ret = 0;
+
+	rdtgrp->closid = closid;
+
+	ret = mkdir_rdt_prepare_rmid_alloc(rdtgrp);
+	if (ret)
+		goto out_closid_free;
+
+	kernfs_activate(rdtgrp->kn);
+
+	ret = rdtgroup_init_alloc(rdtgrp);
+	if (ret < 0)
+		goto out_rmid_free;
+
+	list_add(&rdtgrp->rdtgroup_list, &rdt_all_groups);
+
+	if (resctrl_arch_mon_capable()) {
+		/*
+		 * Create an empty mon_groups directory to hold the subset
+		 * of tasks and cpus to monitor.
+		 */
+		ret = mongroup_create_dir(kn, rdtgrp, "mon_groups", NULL);
+		if (ret) {
+			rdt_last_cmd_puts("kernfs subdir error\n");
+			goto out_del_list;
+		}
+	}
+
+	goto out_unlock;
+
+out_del_list:
+	list_del(&rdtgrp->rdtgroup_list);
+out_rmid_free:
+	mkdir_rdt_prepare_rmid_free(rdtgrp);
+out_closid_free:
+	closid_free(closid);
+out_common_fail:
+	mkdir_rdt_prepare_clean(rdtgrp);
+out_unlock:
+	rdtgroup_kn_unlock(parent_kn);
+	return ret;
+}
+
+/*
+ * We allow creating mon groups only with in a directory called "mon_groups"
+ * which is present in every ctrl_mon group. Check if this is a valid
+ * "mon_groups" directory.
+ *
+ * 1. The directory should be named "mon_groups".
+ * 2. The mon group itself should "not" be named "mon_groups".
+ *   This makes sure "mon_groups" directory always has a ctrl_mon group
+ *   as parent.
+ */
+static bool is_mon_groups(struct kernfs_node *kn, const char *name)
+{
+	return (!strcmp(kn->name, "mon_groups") &&
+		strcmp(name, "mon_groups"));
+}
+
+static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
+			  umode_t mode)
+{
+	/* Do not accept '\n' to avoid unparsable situation. */
+	if (strchr(name, '\n'))
+		return -EINVAL;
+
+	/*
+	 * If the parent directory is the root directory and RDT
+	 * allocation is supported, add a control and monitoring
+	 * subdirectory
+	 */
+	if (resctrl_arch_alloc_capable() && parent_kn == rdtgroup_default.kn)
+		return rdtgroup_mkdir_ctrl_mon(parent_kn, name, mode);
+
+	/*
+	 * If RDT monitoring is supported and the parent directory is a valid
+	 * "mon_groups" directory, add a monitoring subdirectory.
+	 */
+	if (resctrl_arch_mon_capable() && is_mon_groups(parent_kn, name))
+		return rdtgroup_mkdir_mon(parent_kn, name, mode);
+
+	return -EPERM;
+}
+
+static int rdtgroup_rmdir_mon(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
+{
+	struct rdtgroup *prdtgrp = rdtgrp->mon.parent;
+	u32 closid, rmid;
+	int cpu;
+
+	/* Give any tasks back to the parent group */
+	rdt_move_group_tasks(rdtgrp, prdtgrp, tmpmask);
+
+	/* Update per cpu rmid of the moved CPUs first */
+	closid = rdtgrp->closid;
+	rmid = prdtgrp->mon.rmid;
+	for_each_cpu(cpu, &rdtgrp->cpu_mask)
+		resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
+
+	/*
+	 * Update the MSR on moved CPUs and CPUs which have moved
+	 * task running on them.
+	 */
+	cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask);
+	update_closid_rmid(tmpmask, NULL);
+
+	rdtgrp->flags = RDT_DELETED;
+	free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+
+	/*
+	 * Remove the rdtgrp from the parent ctrl_mon group's list
+	 */
+	WARN_ON(list_empty(&prdtgrp->mon.crdtgrp_list));
+	list_del(&rdtgrp->mon.crdtgrp_list);
+
+	kernfs_remove(rdtgrp->kn);
+
+	return 0;
+}
+
+static int rdtgroup_ctrl_remove(struct rdtgroup *rdtgrp)
+{
+	rdtgrp->flags = RDT_DELETED;
+	list_del(&rdtgrp->rdtgroup_list);
+
+	kernfs_remove(rdtgrp->kn);
+	return 0;
+}
+
+static int rdtgroup_rmdir_ctrl(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
+{
+	u32 closid, rmid;
+	int cpu;
+
+	/* Give any tasks back to the default group */
+	rdt_move_group_tasks(rdtgrp, &rdtgroup_default, tmpmask);
+
+	/* Give any CPUs back to the default group */
+	cpumask_or(&rdtgroup_default.cpu_mask,
+		   &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);
+
+	/* Update per cpu closid and rmid of the moved CPUs first */
+	closid = rdtgroup_default.closid;
+	rmid = rdtgroup_default.mon.rmid;
+	for_each_cpu(cpu, &rdtgrp->cpu_mask)
+		resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
+
+	/*
+	 * Update the MSR on moved CPUs and CPUs which have moved
+	 * task running on them.
+	 */
+	cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask);
+	update_closid_rmid(tmpmask, NULL);
+
+	free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+	closid_free(rdtgrp->closid);
+
+	rdtgroup_ctrl_remove(rdtgrp);
+
+	/*
+	 * Free all the child monitor group rmids.
+	 */
+	free_all_child_rdtgrp(rdtgrp);
+
+	return 0;
+}
+
+static int rdtgroup_rmdir(struct kernfs_node *kn)
+{
+	struct kernfs_node *parent_kn = kn->parent;
+	struct rdtgroup *rdtgrp;
+	cpumask_var_t tmpmask;
+	int ret = 0;
+
+	if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL))
+		return -ENOMEM;
+
+	rdtgrp = rdtgroup_kn_lock_live(kn);
+	if (!rdtgrp) {
+		ret = -EPERM;
+		goto out;
+	}
+
+	/*
+	 * If the rdtgroup is a ctrl_mon group and parent directory
+	 * is the root directory, remove the ctrl_mon group.
+	 *
+	 * If the rdtgroup is a mon group and parent directory
+	 * is a valid "mon_groups" directory, remove the mon group.
+	 */
+	if (rdtgrp->type == RDTCTRL_GROUP && parent_kn == rdtgroup_default.kn &&
+	    rdtgrp != &rdtgroup_default) {
+		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
+		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+			ret = rdtgroup_ctrl_remove(rdtgrp);
+		} else {
+			ret = rdtgroup_rmdir_ctrl(rdtgrp, tmpmask);
+		}
+	} else if (rdtgrp->type == RDTMON_GROUP &&
+		 is_mon_groups(parent_kn, kn->name)) {
+		ret = rdtgroup_rmdir_mon(rdtgrp, tmpmask);
+	} else {
+		ret = -EPERM;
+	}
+
+out:
+	rdtgroup_kn_unlock(kn);
+	free_cpumask_var(tmpmask);
+	return ret;
+}
+
+/**
+ * mongrp_reparent() - replace parent CTRL_MON group of a MON group
+ * @rdtgrp:		the MON group whose parent should be replaced
+ * @new_prdtgrp:	replacement parent CTRL_MON group for @rdtgrp
+ * @cpus:		cpumask provided by the caller for use during this call
+ *
+ * Replaces the parent CTRL_MON group for a MON group, resulting in all member
+ * tasks' CLOSID immediately changing to that of the new parent group.
+ * Monitoring data for the group is unaffected by this operation.
+ */
+static void mongrp_reparent(struct rdtgroup *rdtgrp,
+			    struct rdtgroup *new_prdtgrp,
+			    cpumask_var_t cpus)
+{
+	struct rdtgroup *prdtgrp = rdtgrp->mon.parent;
+
+	WARN_ON(rdtgrp->type != RDTMON_GROUP);
+	WARN_ON(new_prdtgrp->type != RDTCTRL_GROUP);
+
+	/* Nothing to do when simply renaming a MON group. */
+	if (prdtgrp == new_prdtgrp)
+		return;
+
+	WARN_ON(list_empty(&prdtgrp->mon.crdtgrp_list));
+	list_move_tail(&rdtgrp->mon.crdtgrp_list,
+		       &new_prdtgrp->mon.crdtgrp_list);
+
+	rdtgrp->mon.parent = new_prdtgrp;
+	rdtgrp->closid = new_prdtgrp->closid;
+
+	/* Propagate updated closid to all tasks in this group. */
+	rdt_move_group_tasks(rdtgrp, rdtgrp, cpus);
+
+	update_closid_rmid(cpus, NULL);
+}
+
+static int rdtgroup_rename(struct kernfs_node *kn,
+			   struct kernfs_node *new_parent, const char *new_name)
+{
+	struct rdtgroup *new_prdtgrp;
+	struct rdtgroup *rdtgrp;
+	cpumask_var_t tmpmask;
+	int ret;
+
+	rdtgrp = kernfs_to_rdtgroup(kn);
+	new_prdtgrp = kernfs_to_rdtgroup(new_parent);
+	if (!rdtgrp || !new_prdtgrp)
+		return -ENOENT;
+
+	/* Release both kernfs active_refs before obtaining rdtgroup mutex. */
+	rdtgroup_kn_get(rdtgrp, kn);
+	rdtgroup_kn_get(new_prdtgrp, new_parent);
+
+	mutex_lock(&rdtgroup_mutex);
+
+	rdt_last_cmd_clear();
+
+	/*
+	 * Don't allow kernfs_to_rdtgroup() to return a parent rdtgroup if
+	 * either kernfs_node is a file.
+	 */
+	if (kernfs_type(kn) != KERNFS_DIR ||
+	    kernfs_type(new_parent) != KERNFS_DIR) {
+		rdt_last_cmd_puts("Source and destination must be directories");
+		ret = -EPERM;
+		goto out;
+	}
+
+	if ((rdtgrp->flags & RDT_DELETED) || (new_prdtgrp->flags & RDT_DELETED)) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	if (rdtgrp->type != RDTMON_GROUP || !kn->parent ||
+	    !is_mon_groups(kn->parent, kn->name)) {
+		rdt_last_cmd_puts("Source must be a MON group\n");
+		ret = -EPERM;
+		goto out;
+	}
+
+	if (!is_mon_groups(new_parent, new_name)) {
+		rdt_last_cmd_puts("Destination must be a mon_groups subdirectory\n");
+		ret = -EPERM;
+		goto out;
+	}
+
+	/*
+	 * If the MON group is monitoring CPUs, the CPUs must be assigned to the
+	 * current parent CTRL_MON group and therefore cannot be assigned to
+	 * the new parent, making the move illegal.
+	 */
+	if (!cpumask_empty(&rdtgrp->cpu_mask) &&
+	    rdtgrp->mon.parent != new_prdtgrp) {
+		rdt_last_cmd_puts("Cannot move a MON group that monitors CPUs\n");
+		ret = -EPERM;
+		goto out;
+	}
+
+	/*
+	 * Allocate the cpumask for use in mongrp_reparent() to avoid the
+	 * possibility of failing to allocate it after kernfs_rename() has
+	 * succeeded.
+	 */
+	if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL)) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	/*
+	 * Perform all input validation and allocations needed to ensure
+	 * mongrp_reparent() will succeed before calling kernfs_rename(),
+	 * otherwise it would be necessary to revert this call if
+	 * mongrp_reparent() failed.
+	 */
+	ret = kernfs_rename(kn, new_parent, new_name);
+	if (!ret)
+		mongrp_reparent(rdtgrp, new_prdtgrp, tmpmask);
+
+	free_cpumask_var(tmpmask);
+
+out:
+	mutex_unlock(&rdtgroup_mutex);
+	rdtgroup_kn_put(rdtgrp, kn);
+	rdtgroup_kn_put(new_prdtgrp, new_parent);
+	return ret;
+}
+
+static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
+{
+	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3))
+		seq_puts(seq, ",cdp");
+
+	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2))
+		seq_puts(seq, ",cdpl2");
+
+	if (is_mba_sc(resctrl_arch_get_resource(RDT_RESOURCE_MBA)))
+		seq_puts(seq, ",mba_MBps");
+
+	if (resctrl_debug)
+		seq_puts(seq, ",debug");
+
+	return 0;
+}
+
+static struct kernfs_syscall_ops rdtgroup_kf_syscall_ops = {
+	.mkdir		= rdtgroup_mkdir,
+	.rmdir		= rdtgroup_rmdir,
+	.rename		= rdtgroup_rename,
+	.show_options	= rdtgroup_show_options,
+};
+
+static int rdtgroup_setup_root(struct rdt_fs_context *ctx)
+{
+	rdt_root = kernfs_create_root(&rdtgroup_kf_syscall_ops,
+				      KERNFS_ROOT_CREATE_DEACTIVATED |
+				      KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK,
+				      &rdtgroup_default);
+	if (IS_ERR(rdt_root))
+		return PTR_ERR(rdt_root);
+
+	ctx->kfc.root = rdt_root;
+	rdtgroup_default.kn = kernfs_root_to_node(rdt_root);
+
+	return 0;
+}
+
+static void rdtgroup_destroy_root(void)
+{
+	kernfs_destroy_root(rdt_root);
+	rdtgroup_default.kn = NULL;
+}
+
+static void rdtgroup_setup_default(void)
+{
+	mutex_lock(&rdtgroup_mutex);
+
+	rdtgroup_default.closid = RESCTRL_RESERVED_CLOSID;
+	rdtgroup_default.mon.rmid = RESCTRL_RESERVED_RMID;
+	rdtgroup_default.type = RDTCTRL_GROUP;
+	INIT_LIST_HEAD(&rdtgroup_default.mon.crdtgrp_list);
+
+	list_add(&rdtgroup_default.rdtgroup_list, &rdt_all_groups);
+
+	mutex_unlock(&rdtgroup_mutex);
+}
+
+static void domain_destroy_mon_state(struct rdt_domain *d)
+{
+	bitmap_free(d->rmid_busy_llc);
+	kfree(d->mbm_total);
+	kfree(d->mbm_local);
+}
+
+void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d)
+{
+	mutex_lock(&rdtgroup_mutex);
+
+	if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA)
+		mba_sc_domain_destroy(r, d);
+
+	if (!r->mon_capable)
+		goto out_unlock;
+
+	/*
+	 * If resctrl is mounted, remove all the
+	 * per domain monitor data directories.
+	 */
+	if (resctrl_mounted && resctrl_arch_mon_capable())
+		rmdir_mondata_subdir_allrdtgrp(r, d->id);
+
+	if (resctrl_is_mbm_enabled())
+		cancel_delayed_work(&d->mbm_over);
+	if (resctrl_arch_is_llc_occupancy_enabled() && has_busy_rmid(d)) {
+		/*
+		 * When a package is going down, forcefully
+		 * decrement rmid->ebusy. There is no way to know
+		 * that the L3 was flushed and hence may lead to
+		 * incorrect counts in rare scenarios, but leaving
+		 * the RMID as busy creates RMID leaks if the
+		 * package never comes back.
+		 */
+		__check_limbo(d, true);
+		cancel_delayed_work(&d->cqm_limbo);
+	}
+
+	domain_destroy_mon_state(d);
+
+out_unlock:
+	mutex_unlock(&rdtgroup_mutex);
+}
+
+static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
+{
+	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
+	size_t tsize;
+
+	if (resctrl_arch_is_llc_occupancy_enabled()) {
+		d->rmid_busy_llc = bitmap_zalloc(idx_limit, GFP_KERNEL);
+		if (!d->rmid_busy_llc)
+			return -ENOMEM;
+	}
+	if (resctrl_arch_is_mbm_total_enabled()) {
+		tsize = sizeof(*d->mbm_total);
+		d->mbm_total = kcalloc(idx_limit, tsize, GFP_KERNEL);
+		if (!d->mbm_total) {
+			bitmap_free(d->rmid_busy_llc);
+			return -ENOMEM;
+		}
+	}
+	if (resctrl_arch_is_mbm_local_enabled()) {
+		tsize = sizeof(*d->mbm_local);
+		d->mbm_local = kcalloc(idx_limit, tsize, GFP_KERNEL);
+		if (!d->mbm_local) {
+			bitmap_free(d->rmid_busy_llc);
+			kfree(d->mbm_total);
+			return -ENOMEM;
+		}
+	}
+
+	return 0;
+}
+
+int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d)
+{
+	int err = 0;
+
+	mutex_lock(&rdtgroup_mutex);
+
+	if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA) {
+		/* RDT_RESOURCE_MBA is never mon_capable */
+		err = mba_sc_domain_allocate(r, d);
+		goto out_unlock;
+	}
+
+	if (!r->mon_capable)
+		goto out_unlock;
+
+	err = domain_setup_mon_state(r, d);
+	if (err)
+		goto out_unlock;
+
+	if (resctrl_is_mbm_enabled()) {
+		INIT_DELAYED_WORK(&d->mbm_over, mbm_handle_overflow);
+		mbm_setup_overflow_handler(d, MBM_OVERFLOW_INTERVAL,
+					   RESCTRL_PICK_ANY_CPU);
+	}
+
+	if (resctrl_arch_is_llc_occupancy_enabled())
+		INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo);
+
+	/*
+	 * If the filesystem is not mounted then only the default resource group
+	 * exists. Creation of its directories is deferred until mount time
+	 * by rdt_get_tree() calling mkdir_mondata_all().
+	 * If resctrl is mounted, add per domain monitor data directories.
+	 */
+	if (resctrl_mounted && resctrl_arch_mon_capable())
+		mkdir_mondata_subdir_allrdtgrp(r, d);
+
+out_unlock:
+	mutex_unlock(&rdtgroup_mutex);
+
+	return err;
+}
+
+void resctrl_online_cpu(unsigned int cpu)
+{
+	mutex_lock(&rdtgroup_mutex);
+	/* The CPU is set in default rdtgroup after online. */
+	cpumask_set_cpu(cpu, &rdtgroup_default.cpu_mask);
+	mutex_unlock(&rdtgroup_mutex);
+}
+
+static void clear_childcpus(struct rdtgroup *r, unsigned int cpu)
+{
+	struct rdtgroup *cr;
+
+	list_for_each_entry(cr, &r->mon.crdtgrp_list, mon.crdtgrp_list) {
+		if (cpumask_test_and_clear_cpu(cpu, &cr->cpu_mask))
+			break;
+	}
+}
+
+void resctrl_offline_cpu(unsigned int cpu)
+{
+	struct rdt_resource *l3 = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	struct rdtgroup *rdtgrp;
+	struct rdt_domain *d;
+
+	mutex_lock(&rdtgroup_mutex);
+	list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
+		if (cpumask_test_and_clear_cpu(cpu, &rdtgrp->cpu_mask)) {
+			clear_childcpus(rdtgrp, cpu);
+			break;
+		}
+	}
+
+	if (!l3->mon_capable)
+		goto out_unlock;
+
+	d = resctrl_get_domain_from_cpu(cpu, l3);
+	if (d) {
+		if (resctrl_is_mbm_enabled() && cpu == d->mbm_work_cpu) {
+			cancel_delayed_work(&d->mbm_over);
+			mbm_setup_overflow_handler(d, 0, cpu);
+		}
+		if (resctrl_arch_is_llc_occupancy_enabled() &&
+		    cpu == d->cqm_work_cpu && has_busy_rmid(d)) {
+			cancel_delayed_work(&d->cqm_limbo);
+			cqm_setup_limbo_handler(d, 0, cpu);
+		}
+	}
+
+out_unlock:
+	mutex_unlock(&rdtgroup_mutex);
+}
+
+/*
+ * resctrl_init - resctrl filesystem initialization
+ *
+ * Setup resctrl file system including set up root, create mount point,
+ * register resctrl filesystem, and initialize files under root directory.
+ *
+ * Return: 0 on success or -errno
+ */
+int resctrl_init(void)
+{
+	int ret = 0;
+
+	seq_buf_init(&last_cmd_status, last_cmd_status_buf,
+		     sizeof(last_cmd_status_buf));
+
+	rdtgroup_setup_default();
+
+	thread_throttle_mode_init();
+
+	ret = resctrl_mon_resource_init();
+	if (ret)
+		return ret;
+
+	ret = sysfs_create_mount_point(fs_kobj, "resctrl");
+	if (ret)
+		return ret;
+
+	ret = register_filesystem(&rdt_fs_type);
+	if (ret)
+		goto cleanup_mountpoint;
+
+	/*
+	 * Adding the resctrl debugfs directory here may not be ideal since
+	 * it would let the resctrl debugfs directory appear on the debugfs
+	 * filesystem before the resctrl filesystem is mounted.
+	 * It may also be ok since that would enable debugging of RDT before
+	 * resctrl is mounted.
+	 * The reason why the debugfs directory is created here and not in
+	 * rdt_get_tree() is because rdt_get_tree() takes rdtgroup_mutex and
+	 * during the debugfs directory creation also &sb->s_type->i_mutex_key
+	 * (the lockdep class of inode->i_rwsem). Other filesystem
+	 * interactions (eg. SyS_getdents) have the lock ordering:
+	 * &sb->s_type->i_mutex_key --> &mm->mmap_lock
+	 * During mmap(), called with &mm->mmap_lock, the rdtgroup_mutex
+	 * is taken, thus creating dependency:
+	 * &mm->mmap_lock --> rdtgroup_mutex for the latter that can cause
+	 * issues considering the other two lock dependencies.
+	 * By creating the debugfs directory here we avoid a dependency
+	 * that may cause deadlock (even though file operations cannot
+	 * occur until the filesystem is mounted, but I do not know how to
+	 * tell lockdep that).
+	 */
+	debugfs_resctrl = debugfs_create_dir("resctrl", NULL);
+
+	return 0;
+
+cleanup_mountpoint:
+	sysfs_remove_mount_point(fs_kobj, "resctrl");
+
+	return ret;
+}
+
+void resctrl_exit(void)
+{
+	debugfs_remove_recursive(debugfs_resctrl);
+	unregister_filesystem(&rdt_fs_type);
+	sysfs_remove_mount_point(fs_kobj, "resctrl");
+
+	resctrl_mon_resource_exit();
+}
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index f5cdabe2ee9e..e69de29bb2d1 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -1,532 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Resource Director Technology(RDT)
- * - Cache Allocation code.
- *
- * Copyright (C) 2016 Intel Corporation
- *
- * Authors:
- *    Fenghua Yu <fenghua.yu@intel.com>
- *    Tony Luck <tony.luck@intel.com>
- *
- * More information about RDT be found in the Intel (R) x86 Architecture
- * Software Developer Manual June 2016, volume 3, section 17.17.
- */
-
-#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
-
-#include <linux/cpu.h>
-#include <linux/kernfs.h>
-#include <linux/seq_file.h>
-#include <linux/slab.h>
-#include "internal.h"
-
-struct rdt_parse_data {
-	struct rdtgroup *rdtgrp;
-	char *buf;
-};
-
-typedef int(ctrlval_parser_t)(struct rdt_parse_data *data,
-			      struct resctrl_schema *s, struct rdt_domain *d);
-
-/*
- * Check whether MBA bandwidth percentage value is correct. The value is
- * checked against the minimum and max bandwidth values specified by the
- * hardware. The allocated bandwidth percentage is rounded to the next
- * control step available on the hardware.
- */
-static bool bw_validate(char *buf, u32 *data, struct rdt_resource *r)
-{
-	int ret;
-	u32 bw;
-
-	/*
-	 * Only linear delay values is supported for current Intel SKUs.
-	 */
-	if (!r->membw.delay_linear && r->membw.arch_needs_linear) {
-		rdt_last_cmd_puts("No support for non-linear MB domains\n");
-		return false;
-	}
-
-	ret = kstrtou32(buf, 10, &bw);
-	if (ret) {
-		rdt_last_cmd_printf("Invalid MB value %s\n", buf);
-		return false;
-	}
-
-	/* Nothing else to do if software controller is enabled. */
-	if (is_mba_sc(r)) {
-		*data = bw;
-		return true;
-	}
-
-	if (bw < r->membw.min_bw || bw > r->default_ctrl) {
-		rdt_last_cmd_printf("MB value %u out of range [%d,%d]\n", bw,
-				    r->membw.min_bw, r->default_ctrl);
-		return false;
-	}
-
-	*data = roundup(bw, (unsigned long)r->membw.bw_gran);
-	return true;
-}
-
-static int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
-		    struct rdt_domain *d)
-{
-	struct resctrl_staged_config *cfg;
-	u32 closid = data->rdtgrp->closid;
-	struct rdt_resource *r = s->res;
-	u32 bw_val;
-
-	cfg = &d->staged_config[s->conf_type];
-	if (cfg->have_new_ctrl) {
-		rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
-		return -EINVAL;
-	}
-
-	if (!bw_validate(data->buf, &bw_val, r))
-		return -EINVAL;
-
-	if (is_mba_sc(r)) {
-		d->mbps_val[closid] = bw_val;
-		return 0;
-	}
-
-	cfg->new_ctrl = bw_val;
-	cfg->have_new_ctrl = true;
-
-	return 0;
-}
-
-/*
- * Check whether a cache bit mask is valid.
- * On Intel CPUs, non-contiguous 1s value support is indicated by CPUID:
- *   - CPUID.0x10.1:ECX[3]: L3 non-contiguous 1s value supported if 1
- *   - CPUID.0x10.2:ECX[3]: L2 non-contiguous 1s value supported if 1
- *
- * Haswell does not support a non-contiguous 1s value and additionally
- * requires at least two bits set.
- * AMD allows non-contiguous bitmasks.
- */
-static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
-{
-	unsigned long first_bit, zero_bit, val;
-	unsigned int cbm_len = r->cache.cbm_len;
-	int ret;
-
-	ret = kstrtoul(buf, 16, &val);
-	if (ret) {
-		rdt_last_cmd_printf("Non-hex character in the mask %s\n", buf);
-		return false;
-	}
-
-	if ((r->cache.min_cbm_bits > 0 && val == 0) || val > r->default_ctrl) {
-		rdt_last_cmd_puts("Mask out of range\n");
-		return false;
-	}
-
-	first_bit = find_first_bit(&val, cbm_len);
-	zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
-
-	/* Are non-contiguous bitmasks allowed? */
-	if (!r->cache.arch_has_sparse_bitmasks &&
-	    (find_next_bit(&val, cbm_len, zero_bit) < cbm_len)) {
-		rdt_last_cmd_printf("The mask %lx has non-consecutive 1-bits\n",
-				    val);
-		return false;
-	}
-
-	if ((zero_bit - first_bit) < r->cache.min_cbm_bits) {
-		rdt_last_cmd_printf("Need at least %d bits in the mask\n",
-				    r->cache.min_cbm_bits);
-		return false;
-	}
-
-	*data = val;
-	return true;
-}
-
-/*
- * Read one cache bit mask (hex). Check that it is valid for the current
- * resource type.
- */
-static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
-		     struct rdt_domain *d)
-{
-	struct rdtgroup *rdtgrp = data->rdtgrp;
-	struct resctrl_staged_config *cfg;
-	struct rdt_resource *r = s->res;
-	u32 cbm_val;
-
-	cfg = &d->staged_config[s->conf_type];
-	if (cfg->have_new_ctrl) {
-		rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
-		return -EINVAL;
-	}
-
-	/*
-	 * Cannot set up more than one pseudo-locked region in a cache
-	 * hierarchy.
-	 */
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
-	    rdtgroup_pseudo_locked_in_hierarchy(d)) {
-		rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
-		return -EINVAL;
-	}
-
-	if (!cbm_validate(data->buf, &cbm_val, r))
-		return -EINVAL;
-
-	if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
-	     rdtgrp->mode == RDT_MODE_SHAREABLE) &&
-	    rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
-		rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
-		return -EINVAL;
-	}
-
-	/*
-	 * The CBM may not overlap with the CBM of another closid if
-	 * either is exclusive.
-	 */
-	if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, true)) {
-		rdt_last_cmd_puts("Overlaps with exclusive group\n");
-		return -EINVAL;
-	}
-
-	if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, false)) {
-		if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
-		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-			rdt_last_cmd_puts("Overlaps with other group\n");
-			return -EINVAL;
-		}
-	}
-
-	cfg->new_ctrl = cbm_val;
-	cfg->have_new_ctrl = true;
-
-	return 0;
-}
-
-static ctrlval_parser_t *get_parser(struct rdt_resource *res)
-{
-	if (res->fflags & RFTYPE_RES_CACHE)
-		return &parse_cbm;
-	else
-		return &parse_bw;
-}
-
-/*
- * For each domain in this resource we expect to find a series of:
- *	id=mask
- * separated by ";". The "id" is in decimal, and must match one of
- * the "id"s for this resource.
- */
-static int parse_line(char *line, struct resctrl_schema *s,
-		      struct rdtgroup *rdtgrp)
-{
-	ctrlval_parser_t *parse_ctrlval = get_parser(s->res);
-	enum resctrl_conf_type t = s->conf_type;
-	struct resctrl_staged_config *cfg;
-	struct rdt_resource *r = s->res;
-	struct rdt_parse_data data;
-	char *dom = NULL, *id;
-	struct rdt_domain *d;
-	unsigned long dom_id;
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
-	    (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)) {
-		rdt_last_cmd_puts("Cannot pseudo-lock MBA resource\n");
-		return -EINVAL;
-	}
-
-next:
-	if (!line || line[0] == '\0')
-		return 0;
-	dom = strsep(&line, ";");
-	id = strsep(&dom, "=");
-	if (!dom || kstrtoul(id, 10, &dom_id)) {
-		rdt_last_cmd_puts("Missing '=' or non-numeric domain\n");
-		return -EINVAL;
-	}
-	dom = strim(dom);
-	list_for_each_entry(d, &r->domains, list) {
-		if (d->id == dom_id) {
-			data.buf = dom;
-			data.rdtgrp = rdtgrp;
-			if (parse_ctrlval(&data, s, d))
-				return -EINVAL;
-			if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-				cfg = &d->staged_config[t];
-				/*
-				 * In pseudo-locking setup mode and just
-				 * parsed a valid CBM that should be
-				 * pseudo-locked. Only one locked region per
-				 * resource group and domain so just do
-				 * the required initialization for single
-				 * region and return.
-				 */
-				rdtgrp->plr->s = s;
-				rdtgrp->plr->d = d;
-				rdtgrp->plr->cbm = cfg->new_ctrl;
-				d->plr = rdtgrp->plr;
-				return 0;
-			}
-			goto next;
-		}
-	}
-	return -EINVAL;
-}
-
-static int rdtgroup_parse_resource(char *resname, char *tok,
-				   struct rdtgroup *rdtgrp)
-{
-	struct resctrl_schema *s;
-
-	list_for_each_entry(s, &resctrl_schema_all, list) {
-		if (!strcmp(resname, s->name) && rdtgrp->closid < s->num_closid)
-			return parse_line(tok, s, rdtgrp);
-	}
-	rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
-	return -EINVAL;
-}
-
-ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
-				char *buf, size_t nbytes, loff_t off)
-{
-	struct resctrl_schema *s;
-	struct rdtgroup *rdtgrp;
-	struct rdt_resource *r;
-	char *tok, *resname;
-	int ret = 0;
-
-	/* Valid input requires a trailing newline */
-	if (nbytes == 0 || buf[nbytes - 1] != '\n')
-		return -EINVAL;
-	buf[nbytes - 1] = '\0';
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (!rdtgrp) {
-		rdtgroup_kn_unlock(of->kn);
-		return -ENOENT;
-	}
-	rdt_last_cmd_clear();
-
-	/*
-	 * No changes to pseudo-locked region allowed. It has to be removed
-	 * and re-created instead.
-	 */
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
-		ret = -EINVAL;
-		rdt_last_cmd_puts("Resource group is pseudo-locked\n");
-		goto out;
-	}
-
-	rdt_staged_configs_clear();
-
-	while ((tok = strsep(&buf, "\n")) != NULL) {
-		resname = strim(strsep(&tok, ":"));
-		if (!tok) {
-			rdt_last_cmd_puts("Missing ':'\n");
-			ret = -EINVAL;
-			goto out;
-		}
-		if (tok[0] == '\0') {
-			rdt_last_cmd_printf("Missing '%s' value\n", resname);
-			ret = -EINVAL;
-			goto out;
-		}
-		ret = rdtgroup_parse_resource(resname, tok, rdtgrp);
-		if (ret)
-			goto out;
-	}
-
-	list_for_each_entry(s, &resctrl_schema_all, list) {
-		r = s->res;
-
-		/*
-		 * Writes to mba_sc resources update the software controller,
-		 * not the control MSR.
-		 */
-		if (is_mba_sc(r))
-			continue;
-
-		ret = resctrl_arch_update_domains(r, rdtgrp->closid);
-		if (ret)
-			goto out;
-	}
-
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-		/*
-		 * If pseudo-locking fails we keep the resource group in
-		 * mode RDT_MODE_PSEUDO_LOCKSETUP with its class of service
-		 * active and updated for just the domain the pseudo-locked
-		 * region was requested for.
-		 */
-		ret = rdtgroup_pseudo_lock_create(rdtgrp);
-	}
-
-out:
-	rdt_staged_configs_clear();
-	rdtgroup_kn_unlock(of->kn);
-	return ret ?: nbytes;
-}
-
-static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
-{
-	struct rdt_resource *r = schema->res;
-	struct rdt_domain *dom;
-	bool sep = false;
-	u32 ctrl_val;
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	seq_printf(s, "%*s:", max_name_width, schema->name);
-	list_for_each_entry(dom, &r->domains, list) {
-		if (sep)
-			seq_puts(s, ";");
-
-		if (is_mba_sc(r))
-			ctrl_val = dom->mbps_val[closid];
-		else
-			ctrl_val = resctrl_arch_get_config(r, dom, closid,
-							   schema->conf_type);
-
-		seq_printf(s, r->format_str, dom->id, max_data_width,
-			   ctrl_val);
-		sep = true;
-	}
-	seq_puts(s, "\n");
-}
-
-int rdtgroup_schemata_show(struct kernfs_open_file *of,
-			   struct seq_file *s, void *v)
-{
-	struct resctrl_schema *schema;
-	struct rdtgroup *rdtgrp;
-	int ret = 0;
-	u32 closid;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (rdtgrp) {
-		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-			list_for_each_entry(schema, &resctrl_schema_all, list) {
-				seq_printf(s, "%s:uninitialized\n", schema->name);
-			}
-		} else if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
-			if (!rdtgrp->plr->d) {
-				rdt_last_cmd_clear();
-				rdt_last_cmd_puts("Cache domain offline\n");
-				ret = -ENODEV;
-			} else {
-				seq_printf(s, "%s:%d=%x\n",
-					   rdtgrp->plr->s->res->name,
-					   rdtgrp->plr->d->id,
-					   rdtgrp->plr->cbm);
-			}
-		} else {
-			closid = rdtgrp->closid;
-			list_for_each_entry(schema, &resctrl_schema_all, list) {
-				if (closid < schema->num_closid)
-					show_doms(s, schema, closid);
-			}
-		}
-	} else {
-		ret = -ENOENT;
-	}
-	rdtgroup_kn_unlock(of->kn);
-	return ret;
-}
-
-static int smp_mon_event_count(void *arg)
-{
-	mon_event_count(arg);
-
-	return 0;
-}
-
-void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
-		    struct rdt_domain *d, struct rdtgroup *rdtgrp,
-		    int evtid, int first)
-{
-	int cpu;
-
-	/* When picking a CPU from cpu_mask, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	/*
-	 * Setup the parameters to pass to mon_event_count() to read the data.
-	 */
-	rr->rgrp = rdtgrp;
-	rr->evtid = evtid;
-	rr->r = r;
-	rr->d = d;
-	rr->val = 0;
-	rr->first = first;
-	rr->arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, evtid);
-	if (IS_ERR(rr->arch_mon_ctx)) {
-		rr->err = -EINVAL;
-		return;
-	}
-
-	cpu = cpumask_any_housekeeping(&d->cpu_mask, RESCTRL_PICK_ANY_CPU);
-
-	/*
-	 * cpumask_any_housekeeping() prefers housekeeping CPUs, but
-	 * are all the CPUs nohz_full? If yes, pick a CPU to IPI.
-	 * MPAM's resctrl_arch_rmid_read() is unable to read the
-	 * counters on some platforms if its called in IRQ context.
-	 */
-	if (tick_nohz_full_cpu(cpu))
-		smp_call_function_any(&d->cpu_mask, mon_event_count, rr, 1);
-	else
-		smp_call_on_cpu(cpu, smp_mon_event_count, rr, false);
-
-	resctrl_arch_mon_ctx_free(r, evtid, rr->arch_mon_ctx);
-}
-
-int rdtgroup_mondata_show(struct seq_file *m, void *arg)
-{
-	struct kernfs_open_file *of = m->private;
-	u32 resid, evtid, domid;
-	struct rdtgroup *rdtgrp;
-	struct rdt_resource *r;
-	union mon_data_bits md;
-	struct rdt_domain *d;
-	struct rmid_read rr;
-	int ret = 0;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (!rdtgrp) {
-		ret = -ENOENT;
-		goto out;
-	}
-
-	md.priv = of->kn->priv;
-	resid = md.u.rid;
-	domid = md.u.domid;
-	evtid = md.u.evtid;
-
-	r = resctrl_arch_get_resource(resid);
-	d = resctrl_arch_find_domain(r, domid);
-	if (IS_ERR_OR_NULL(d)) {
-		ret = -ENOENT;
-		goto out;
-	}
-
-	mon_event_read(&rr, r, d, rdtgrp, evtid, false);
-
-	if (rr.err == -EIO)
-		seq_puts(m, "Error\n");
-	else if (rr.err == -EINVAL)
-		seq_puts(m, "Unavailable\n");
-	else
-		seq_printf(m, "%llu\n", rr.val);
-
-out:
-	rdtgroup_kn_unlock(of->kn);
-	return ret;
-}
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index f73267762a87..e69de29bb2d1 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -1,340 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _FS_RESCTRL_INTERNAL_H
-#define _FS_RESCTRL_INTERNAL_H
-
-#include <linux/resctrl.h>
-#include <linux/sched.h>
-#include <linux/kernfs.h>
-#include <linux/fs_context.h>
-#include <linux/jump_label.h>
-#include <linux/tick.h>
-
-#include <asm/resctrl.h>
-
-/**
- * cpumask_any_housekeeping() - Choose any CPU in @mask, preferring those that
- *			        aren't marked nohz_full
- * @mask:	The mask to pick a CPU from.
- * @exclude_cpu:The CPU to avoid picking.
- *
- * Returns a CPU from @mask, but not @exclude_cpu. If there are housekeeping
- * CPUs that don't use nohz_full, these are preferred. Pass
- * RESCTRL_PICK_ANY_CPU to avoid excluding any CPUs.
- *
- * When a CPU is excluded, returns >= nr_cpu_ids if no CPUs are available.
- */
-static inline unsigned int
-cpumask_any_housekeeping(const struct cpumask *mask, int exclude_cpu)
-{
-	unsigned int cpu, hk_cpu;
-
-	if (exclude_cpu == RESCTRL_PICK_ANY_CPU)
-		cpu = cpumask_any(mask);
-	else
-		cpu = cpumask_any_but(mask, exclude_cpu);
-
-	if (!IS_ENABLED(CONFIG_NO_HZ_FULL))
-		return cpu;
-
-	/* If the CPU picked isn't marked nohz_full nothing more needs doing. */
-	if (cpu < nr_cpu_ids && !tick_nohz_full_cpu(cpu))
-		return cpu;
-
-	/* Try to find a CPU that isn't nohz_full to use in preference */
-	hk_cpu = cpumask_nth_andnot(0, mask, tick_nohz_full_mask);
-	if (hk_cpu == exclude_cpu)
-		hk_cpu = cpumask_nth_andnot(1, mask, tick_nohz_full_mask);
-
-	if (hk_cpu < nr_cpu_ids)
-		cpu = hk_cpu;
-
-	return cpu;
-}
-
-struct rdt_fs_context {
-	struct kernfs_fs_context	kfc;
-	bool				enable_cdpl2;
-	bool				enable_cdpl3;
-	bool				enable_mba_mbps;
-	bool				enable_debug;
-};
-
-static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
-{
-	struct kernfs_fs_context *kfc = fc->fs_private;
-
-	return container_of(kfc, struct rdt_fs_context, kfc);
-}
-
-/**
- * struct mon_evt - Entry in the event list of a resource
- * @evtid:		event id
- * @name:		name of the event
- * @configurable:	true if the event is configurable
- * @list:		entry in &rdt_resource->evt_list
- */
-struct mon_evt {
-	enum resctrl_event_id	evtid;
-	char			*name;
-	bool			configurable;
-	struct list_head	list;
-};
-
-/**
- * union mon_data_bits - Monitoring details for each event file
- * @priv:              Used to store monitoring event data in @u
- *                     as kernfs private data
- * @rid:               Resource id associated with the event file
- * @evtid:             Event id associated with the event file
- * @domid:             The domain to which the event file belongs
- * @u:                 Name of the bit fields struct
- */
-union mon_data_bits {
-	void *priv;
-	struct {
-		unsigned int rid		: 10;
-		enum resctrl_event_id evtid	: 8;
-		unsigned int domid		: 14;
-	} u;
-};
-
-struct rmid_read {
-	struct rdtgroup		*rgrp;
-	struct rdt_resource	*r;
-	struct rdt_domain	*d;
-	enum resctrl_event_id	evtid;
-	bool			first;
-	int			err;
-	u64			val;
-	void			*arch_mon_ctx;
-};
-
-extern struct list_head resctrl_schema_all;
-extern bool resctrl_mounted;
-
-enum rdt_group_type {
-	RDTCTRL_GROUP = 0,
-	RDTMON_GROUP,
-	RDT_NUM_GROUP,
-};
-
-/**
- * enum rdtgrp_mode - Mode of a RDT resource group
- * @RDT_MODE_SHAREABLE: This resource group allows sharing of its allocations
- * @RDT_MODE_EXCLUSIVE: No sharing of this resource group's allocations allowed
- * @RDT_MODE_PSEUDO_LOCKSETUP: Resource group will be used for Pseudo-Locking
- * @RDT_MODE_PSEUDO_LOCKED: No sharing of this resource group's allocations
- *                          allowed AND the allocations are Cache Pseudo-Locked
- * @RDT_NUM_MODES: Total number of modes
- *
- * The mode of a resource group enables control over the allowed overlap
- * between allocations associated with different resource groups (classes
- * of service). User is able to modify the mode of a resource group by
- * writing to the "mode" resctrl file associated with the resource group.
- *
- * The "shareable", "exclusive", and "pseudo-locksetup" modes are set by
- * writing the appropriate text to the "mode" file. A resource group enters
- * "pseudo-locked" mode after the schemata is written while the resource
- * group is in "pseudo-locksetup" mode.
- */
-enum rdtgrp_mode {
-	RDT_MODE_SHAREABLE = 0,
-	RDT_MODE_EXCLUSIVE,
-	RDT_MODE_PSEUDO_LOCKSETUP,
-	RDT_MODE_PSEUDO_LOCKED,
-
-	/* Must be last */
-	RDT_NUM_MODES,
-};
-
-/**
- * struct mongroup - store mon group's data in resctrl fs.
- * @mon_data_kn:		kernfs node for the mon_data directory
- * @parent:			parent rdtgrp
- * @crdtgrp_list:		child rdtgroup node list
- * @rmid:			rmid for this rdtgroup
- */
-struct mongroup {
-	struct kernfs_node	*mon_data_kn;
-	struct rdtgroup		*parent;
-	struct list_head	crdtgrp_list;
-	u32			rmid;
-};
-
-/**
- * struct rdtgroup - store rdtgroup's data in resctrl file system.
- * @kn:				kernfs node
- * @rdtgroup_list:		linked list for all rdtgroups
- * @closid:			closid for this rdtgroup
- * @cpu_mask:			CPUs assigned to this rdtgroup
- * @flags:			status bits
- * @waitcount:			how many cpus expect to find this
- *				group when they acquire rdtgroup_mutex
- * @type:			indicates type of this rdtgroup - either
- *				monitor only or ctrl_mon group
- * @mon:			mongroup related data
- * @mode:			mode of resource group
- * @plr:			pseudo-locked region
- */
-struct rdtgroup {
-	struct kernfs_node		*kn;
-	struct list_head		rdtgroup_list;
-	u32				closid;
-	struct cpumask			cpu_mask;
-	int				flags;
-	atomic_t			waitcount;
-	enum rdt_group_type		type;
-	struct mongroup			mon;
-	enum rdtgrp_mode		mode;
-	struct pseudo_lock_region	*plr;
-};
-
-/* List of all resource groups */
-extern struct list_head rdt_all_groups;
-
-extern int max_name_width, max_data_width;
-
-/**
- * struct rftype - describe each file in the resctrl file system
- * @name:	File name
- * @mode:	Access mode
- * @kf_ops:	File operations
- * @flags:	File specific RFTYPE_FLAGS_* flags
- * @fflags:	File specific RFTYPE_* flags
- * @seq_show:	Show content of the file
- * @write:	Write to the file
- */
-struct rftype {
-	char			*name;
-	umode_t			mode;
-	const struct kernfs_ops	*kf_ops;
-	unsigned long		flags;
-	unsigned long		fflags;
-
-	int (*seq_show)(struct kernfs_open_file *of,
-			struct seq_file *sf, void *v);
-	/*
-	 * write() is the generic write callback which maps directly to
-	 * kernfs write operation and overrides all other operations.
-	 * Maximum write size is determined by ->max_write_len.
-	 */
-	ssize_t (*write)(struct kernfs_open_file *of,
-			 char *buf, size_t nbytes, loff_t off);
-};
-
-/**
- * struct mbm_state - status for each MBM counter in each domain
- * @prev_bw_bytes: Previous bytes value read for bandwidth calculation
- * @prev_bw:	The most recent bandwidth in MBps
- */
-struct mbm_state {
-	u64	prev_bw_bytes;
-	u32	prev_bw;
-};
-
-static inline  bool is_mba_sc(struct rdt_resource *r)
-{
-	if (!r)
-		r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-
-	/*
-	 * The software controller support is only applicable to MBA resource.
-	 * Make sure to check for resource type.
-	 */
-	if (r->rid != RDT_RESOURCE_MBA)
-		return false;
-
-	return r->membw.mba_sc;
-}
-
-extern struct mutex rdtgroup_mutex;
-extern struct rdtgroup rdtgroup_default;
-extern struct dentry *debugfs_resctrl;
-
-void rdt_last_cmd_clear(void);
-void rdt_last_cmd_puts(const char *s);
-__printf(1, 2)
-void rdt_last_cmd_printf(const char *fmt, ...);
-
-struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn);
-void rdtgroup_kn_unlock(struct kernfs_node *kn);
-int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name);
-int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
-			     umode_t mask);
-ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
-				char *buf, size_t nbytes, loff_t off);
-int rdtgroup_schemata_show(struct kernfs_open_file *of,
-			   struct seq_file *s, void *v);
-bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
-			   unsigned long cbm, int closid, bool exclusive);
-unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_domain *d,
-				  unsigned long cbm);
-enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
-int rdtgroup_tasks_assigned(struct rdtgroup *r);
-int closids_supported(void);
-void closid_free(int closid);
-int alloc_rmid(u32 closid);
-void free_rmid(u32 closid, u32 rmid);
-void resctrl_mon_resource_exit(void);
-void mon_event_count(void *info);
-int rdtgroup_mondata_show(struct seq_file *m, void *arg);
-void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
-		    struct rdt_domain *d, struct rdtgroup *rdtgrp,
-		    int evtid, int first);
-int resctrl_mon_resource_init(void);
-void mbm_setup_overflow_handler(struct rdt_domain *dom,
-				unsigned long delay_ms,
-				int exclude_cpu);
-void mbm_handle_overflow(struct work_struct *work);
-bool is_mba_sc(struct rdt_resource *r);
-void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms,
-			     int exclude_cpu);
-void cqm_handle_limbo(struct work_struct *work);
-bool has_busy_rmid(struct rdt_domain *d);
-void __check_limbo(struct rdt_domain *d, bool force_free);
-void mbm_config_rftype_init(const char *config);
-void rdt_staged_configs_clear(void);
-bool closid_allocated(unsigned int closid);
-int resctrl_find_cleanest_closid(void);
-
-#ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
-int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
-int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp);
-bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm);
-bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d);
-int rdt_pseudo_lock_init(void);
-void rdt_pseudo_lock_release(void);
-int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
-void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
-#else
-static inline int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
-{
-	return -EOPNOTSUPP;
-}
-
-static inline int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
-{
-	return -EOPNOTSUPP;
-}
-
-static inline bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm)
-{
-	return false;
-}
-
-static inline bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
-{
-	return false;
-}
-
-static inline int rdt_pseudo_lock_init(void) { return 0; }
-static inline void rdt_pseudo_lock_release(void) { }
-static inline int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
-{
-	return -EOPNOTSUPP;
-}
-
-static inline void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp) { }
-#endif /* CONFIG_RESCTRL_FS_PSEUDO_LOCK */
-
-#endif /* _FS_RESCTRL_INTERNAL_H */
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index 06f660dfd929..e69de29bb2d1 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -1,843 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Resource Director Technology(RDT)
- * - Monitoring code
- *
- * Copyright (C) 2017 Intel Corporation
- *
- * Author:
- *    Vikas Shivappa <vikas.shivappa@intel.com>
- *
- * This replaces the cqm.c based on perf but we reuse a lot of
- * code and datastructures originally from Peter Zijlstra and Matt Fleming.
- *
- * More information about RDT be found in the Intel (R) x86 Architecture
- * Software Developer Manual June 2016, volume 3, section 17.17.
- */
-
-#include <linux/cpu.h>
-#include <linux/module.h>
-#include <linux/sizes.h>
-#include <linux/slab.h>
-#include "internal.h"
-
-/*
- * struct rmid_entry - dirty tracking for all RMID.
- * @closid:	The CLOSID for this entry.
- * @rmid:	The RMID for this entry.
- * @busy:	The number of domains with cached data using this RMID.
- * @list:	Member of the rmid_free_lru list when busy == 0.
- *
- * Depending on the architecture the correct monitor is accessed using
- * both @closid and @rmid, or @rmid only.
- *
- * Take the rdtgroup_mutex when accessing.
- */
-struct rmid_entry {
-	u32				closid;
-	u32				rmid;
-	int				busy;
-	struct list_head		list;
-};
-
-/*
- * @rmid_free_lru - A least recently used list of free RMIDs
- *     These RMIDs are guaranteed to have an occupancy less than the
- *     threshold occupancy
- */
-static LIST_HEAD(rmid_free_lru);
-
-/*
- * @closid_num_dirty_rmid    The number of dirty RMID each CLOSID has.
- *     Only allocated when CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID is defined.
- *     Indexed by CLOSID. Protected by rdtgroup_mutex.
- */
-static u32 *closid_num_dirty_rmid;
-
-/*
- * @rmid_limbo_count - count of currently unused but (potentially)
- *     dirty RMIDs.
- *     This counts RMIDs that no one is currently using but that
- *     may have a occupancy value > resctrl_rmid_realloc_threshold. User can
- *     change the threshold occupancy value.
- */
-static unsigned int rmid_limbo_count;
-
-/*
- * @rmid_entry - The entry in the limbo and free lists.
- */
-static struct rmid_entry	*rmid_ptrs;
-
-/*
- * This is the threshold cache occupancy in bytes at which we will consider an
- * RMID available for re-allocation.
- */
-unsigned int resctrl_rmid_realloc_threshold;
-
-/*
- * This is the maximum value for the reallocation threshold, in bytes.
- */
-unsigned int resctrl_rmid_realloc_limit;
-
-/*
- * x86 and arm64 differ in their handling of monitoring.
- * x86's RMID are independent numbers, there is only one source of traffic
- * with an RMID value of '1'.
- * arm64's PMG extends the PARTID/CLOSID space, there are multiple sources of
- * traffic with a PMG value of '1', one for each CLOSID, meaning the RMID
- * value is no longer unique.
- * To account for this, resctrl uses an index. On x86 this is just the RMID,
- * on arm64 it encodes the CLOSID and RMID. This gives a unique number.
- *
- * The domain's rmid_busy_llc and rmid_ptrs[] are sized by index. The arch code
- * must accept an attempt to read every index.
- */
-static inline struct rmid_entry *__rmid_entry(u32 idx)
-{
-	struct rmid_entry *entry;
-	u32 closid, rmid;
-
-	entry = &rmid_ptrs[idx];
-	resctrl_arch_rmid_idx_decode(idx, &closid, &rmid);
-
-	WARN_ON_ONCE(entry->closid != closid);
-	WARN_ON_ONCE(entry->rmid != rmid);
-
-	return entry;
-}
-
-static void limbo_release_entry(struct rmid_entry *entry)
-{
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	rmid_limbo_count--;
-	list_add_tail(&entry->list, &rmid_free_lru);
-
-	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
-		closid_num_dirty_rmid[entry->closid]--;
-}
-
-/*
- * Check the RMIDs that are marked as busy for this domain. If the
- * reported LLC occupancy is below the threshold clear the busy bit and
- * decrement the count. If the busy count gets to zero on an RMID, we
- * free the RMID
- */
-void __check_limbo(struct rdt_domain *d, bool force_free)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
-	struct rmid_entry *entry;
-	u32 idx, cur_idx = 1;
-	void *arch_mon_ctx;
-	bool rmid_dirty;
-	u64 val = 0;
-
-	arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, QOS_L3_OCCUP_EVENT_ID);
-	if (IS_ERR(arch_mon_ctx)) {
-		pr_warn_ratelimited("Failed to allocate monitor context: %ld",
-				    PTR_ERR(arch_mon_ctx));
-		return;
-	}
-
-	/*
-	 * Skip RMID 0 and start from RMID 1 and check all the RMIDs that
-	 * are marked as busy for occupancy < threshold. If the occupancy
-	 * is less than the threshold decrement the busy counter of the
-	 * RMID and move it to the free list when the counter reaches 0.
-	 */
-	for (;;) {
-		idx = find_next_bit(d->rmid_busy_llc, idx_limit, cur_idx);
-		if (idx >= idx_limit)
-			break;
-
-		entry = __rmid_entry(idx);
-		if (resctrl_arch_rmid_read(r, d, entry->closid, entry->rmid,
-					   QOS_L3_OCCUP_EVENT_ID, &val,
-					   arch_mon_ctx)) {
-			rmid_dirty = true;
-		} else {
-			rmid_dirty = (val >= resctrl_rmid_realloc_threshold);
-		}
-
-		if (force_free || !rmid_dirty) {
-			clear_bit(idx, d->rmid_busy_llc);
-			if (!--entry->busy)
-				limbo_release_entry(entry);
-		}
-		cur_idx = idx + 1;
-	}
-
-	resctrl_arch_mon_ctx_free(r, QOS_L3_OCCUP_EVENT_ID, arch_mon_ctx);
-}
-
-bool has_busy_rmid(struct rdt_domain *d)
-{
-	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
-
-	return find_first_bit(d->rmid_busy_llc, idx_limit) != idx_limit;
-}
-
-static struct rmid_entry *resctrl_find_free_rmid(u32 closid)
-{
-	struct rmid_entry *itr;
-	u32 itr_idx, cmp_idx;
-
-	if (list_empty(&rmid_free_lru))
-		return rmid_limbo_count ? ERR_PTR(-EBUSY) : ERR_PTR(-ENOSPC);
-
-	list_for_each_entry(itr, &rmid_free_lru, list) {
-		/*
-		 * Get the index of this free RMID, and the index it would need
-		 * to be if it were used with this CLOSID.
-		 * If the CLOSID is irrelevant on this architecture, the two
-		 * index values are always the same on every entry and thus the
-		 * very first entry will be returned.
-		 */
-		itr_idx = resctrl_arch_rmid_idx_encode(itr->closid, itr->rmid);
-		cmp_idx = resctrl_arch_rmid_idx_encode(closid, itr->rmid);
-
-		if (itr_idx == cmp_idx)
-			return itr;
-	}
-
-	return ERR_PTR(-ENOSPC);
-}
-
-/**
- * resctrl_find_cleanest_closid() - Find a CLOSID where all the associated
- *                                  RMID are clean, or the CLOSID that has
- *                                  the most clean RMID.
- *
- * MPAM's equivalent of RMID are per-CLOSID, meaning a freshly allocated CLOSID
- * may not be able to allocate clean RMID. To avoid this the allocator will
- * choose the CLOSID with the most clean RMID.
- *
- * When the CLOSID and RMID are independent numbers, the first free CLOSID will
- * be returned.
- */
-int resctrl_find_cleanest_closid(void)
-{
-	u32 cleanest_closid = ~0;
-	int i = 0;
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	if (!IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
-		return -EIO;
-
-	for (i = 0; i < closids_supported(); i++) {
-		int num_dirty;
-
-		if (closid_allocated(i))
-			continue;
-
-		num_dirty = closid_num_dirty_rmid[i];
-		if (num_dirty == 0)
-			return i;
-
-		if (cleanest_closid == ~0)
-			cleanest_closid = i;
-
-		if (num_dirty < closid_num_dirty_rmid[cleanest_closid])
-			cleanest_closid = i;
-	}
-
-	if (cleanest_closid == ~0)
-		return -ENOSPC;
-
-	return cleanest_closid;
-}
-
-/*
- * For MPAM the RMID value is not unique, and has to be considered with
- * the CLOSID. The (CLOSID, RMID) pair is allocated on all domains, which
- * allows all domains to be managed by a single free list.
- * Each domain also has a rmid_busy_llc to reduce the work of the limbo handler.
- */
-int alloc_rmid(u32 closid)
-{
-	struct rmid_entry *entry;
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	entry = resctrl_find_free_rmid(closid);
-	if (IS_ERR(entry))
-		return PTR_ERR(entry);
-
-	list_del(&entry->list);
-	return entry->rmid;
-}
-
-static void add_rmid_to_limbo(struct rmid_entry *entry)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	struct rdt_domain *d;
-	u32 idx;
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	idx = resctrl_arch_rmid_idx_encode(entry->closid, entry->rmid);
-
-	entry->busy = 0;
-	list_for_each_entry(d, &r->domains, list) {
-		/*
-		 * For the first limbo RMID in the domain,
-		 * setup up the limbo worker.
-		 */
-		if (!has_busy_rmid(d))
-			cqm_setup_limbo_handler(d, CQM_LIMBOCHECK_INTERVAL,
-						RESCTRL_PICK_ANY_CPU);
-		set_bit(idx, d->rmid_busy_llc);
-		entry->busy++;
-	}
-
-	rmid_limbo_count++;
-	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
-		closid_num_dirty_rmid[entry->closid]++;
-}
-
-void free_rmid(u32 closid, u32 rmid)
-{
-	u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
-	struct rmid_entry *entry;
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	/*
-	 * Do not allow the default rmid to be free'd. Comparing by index
-	 * allows architectures that ignore the closid parameter to avoid an
-	 * unnecessary check.
-	 */
-	if (idx == resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
-						RESCTRL_RESERVED_RMID))
-		return;
-
-	entry = __rmid_entry(idx);
-
-	if (resctrl_arch_is_llc_occupancy_enabled())
-		add_rmid_to_limbo(entry);
-	else
-		list_add_tail(&entry->list, &rmid_free_lru);
-}
-
-static struct mbm_state *get_mbm_state(struct rdt_domain *d, u32 closid,
-				       u32 rmid, enum resctrl_event_id evtid)
-{
-	u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
-
-	switch (evtid) {
-	case QOS_L3_MBM_TOTAL_EVENT_ID:
-		return &d->mbm_total[idx];
-	case QOS_L3_MBM_LOCAL_EVENT_ID:
-		return &d->mbm_local[idx];
-	default:
-		return NULL;
-	}
-}
-
-static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
-{
-	struct mbm_state *m;
-	u64 tval = 0;
-
-	if (rr->first) {
-		resctrl_arch_reset_rmid(rr->r, rr->d, closid, rmid, rr->evtid);
-		m = get_mbm_state(rr->d, closid, rmid, rr->evtid);
-		if (m)
-			memset(m, 0, sizeof(struct mbm_state));
-		return 0;
-	}
-
-	rr->err = resctrl_arch_rmid_read(rr->r, rr->d, closid, rmid, rr->evtid,
-					 &tval, rr->arch_mon_ctx);
-	if (rr->err)
-		return rr->err;
-
-	rr->val += tval;
-
-	return 0;
-}
-
-/*
- * mbm_bw_count() - Update bw count from values previously read by
- *		    __mon_event_count().
- * @closid:	The closid used to identify the cached mbm_state.
- * @rmid:	The rmid used to identify the cached mbm_state.
- * @rr:		The struct rmid_read populated by __mon_event_count().
- *
- * Supporting function to calculate the memory bandwidth
- * and delta bandwidth in MBps. The chunks value previously read by
- * __mon_event_count() is compared with the chunks value from the previous
- * invocation. This must be called once per second to maintain values in MBps.
- */
-static void mbm_bw_count(u32 closid, u32 rmid, struct rmid_read *rr)
-{
-	u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
-	struct mbm_state *m = &rr->d->mbm_local[idx];
-	u64 cur_bw, bytes, cur_bytes;
-
-	cur_bytes = rr->val;
-	bytes = cur_bytes - m->prev_bw_bytes;
-	m->prev_bw_bytes = cur_bytes;
-
-	cur_bw = bytes / SZ_1M;
-
-	m->prev_bw = cur_bw;
-}
-
-/*
- * This is scheduled by mon_event_read() to read the CQM/MBM counters
- * on a domain.
- */
-void mon_event_count(void *info)
-{
-	struct rdtgroup *rdtgrp, *entry;
-	struct rmid_read *rr = info;
-	struct list_head *head;
-	int ret;
-
-	rdtgrp = rr->rgrp;
-
-	ret = __mon_event_count(rdtgrp->closid, rdtgrp->mon.rmid, rr);
-
-	/*
-	 * For Ctrl groups read data from child monitor groups and
-	 * add them together. Count events which are read successfully.
-	 * Discard the rmid_read's reporting errors.
-	 */
-	head = &rdtgrp->mon.crdtgrp_list;
-
-	if (rdtgrp->type == RDTCTRL_GROUP) {
-		list_for_each_entry(entry, head, mon.crdtgrp_list) {
-			if (__mon_event_count(entry->closid, entry->mon.rmid,
-					      rr) == 0)
-				ret = 0;
-		}
-	}
-
-	/*
-	 * __mon_event_count() calls for newly created monitor groups may
-	 * report -EINVAL/Unavailable if the monitor hasn't seen any traffic.
-	 * Discard error if any of the monitor event reads succeeded.
-	 */
-	if (ret == 0)
-		rr->err = 0;
-}
-
-/*
- * Feedback loop for MBA software controller (mba_sc)
- *
- * mba_sc is a feedback loop where we periodically read MBM counters and
- * adjust the bandwidth percentage values via the IA32_MBA_THRTL_MSRs so
- * that:
- *
- *   current bandwidth(cur_bw) < user specified bandwidth(user_bw)
- *
- * This uses the MBM counters to measure the bandwidth and MBA throttle
- * MSRs to control the bandwidth for a particular rdtgrp. It builds on the
- * fact that resctrl rdtgroups have both monitoring and control.
- *
- * The frequency of the checks is 1s and we just tag along the MBM overflow
- * timer. Having 1s interval makes the calculation of bandwidth simpler.
- *
- * Although MBA's goal is to restrict the bandwidth to a maximum, there may
- * be a need to increase the bandwidth to avoid unnecessarily restricting
- * the L2 <-> L3 traffic.
- *
- * Since MBA controls the L2 external bandwidth where as MBM measures the
- * L3 external bandwidth the following sequence could lead to such a
- * situation.
- *
- * Consider an rdtgroup which had high L3 <-> memory traffic in initial
- * phases -> mba_sc kicks in and reduced bandwidth percentage values -> but
- * after some time rdtgroup has mostly L2 <-> L3 traffic.
- *
- * In this case we may restrict the rdtgroup's L2 <-> L3 traffic as its
- * throttle MSRs already have low percentage values.  To avoid
- * unnecessarily restricting such rdtgroups, we also increase the bandwidth.
- */
-static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
-{
-	u32 closid, rmid, cur_msr_val, new_msr_val;
-	struct mbm_state *pmbm_data, *cmbm_data;
-	struct rdt_resource *r_mba;
-	struct rdt_domain *dom_mba;
-	u32 cur_bw, user_bw, idx;
-	struct list_head *head;
-	struct rdtgroup *entry;
-
-	if (!resctrl_arch_is_mbm_local_enabled())
-		return;
-
-	r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-
-	closid = rgrp->closid;
-	rmid = rgrp->mon.rmid;
-	idx = resctrl_arch_rmid_idx_encode(closid, rmid);
-	pmbm_data = &dom_mbm->mbm_local[idx];
-
-	dom_mba = resctrl_get_domain_from_cpu(smp_processor_id(), r_mba);
-	if (!dom_mba) {
-		pr_warn_once("Failure to get domain for MBA update\n");
-		return;
-	}
-
-	cur_bw = pmbm_data->prev_bw;
-	user_bw = dom_mba->mbps_val[closid];
-
-	/* MBA resource doesn't support CDP */
-	cur_msr_val = resctrl_arch_get_config(r_mba, dom_mba, closid, CDP_NONE);
-
-	/*
-	 * For Ctrl groups read data from child monitor groups.
-	 */
-	head = &rgrp->mon.crdtgrp_list;
-	list_for_each_entry(entry, head, mon.crdtgrp_list) {
-		cmbm_data = &dom_mbm->mbm_local[entry->mon.rmid];
-		cur_bw += cmbm_data->prev_bw;
-	}
-
-	/*
-	 * Scale up/down the bandwidth linearly for the ctrl group.  The
-	 * bandwidth step is the bandwidth granularity specified by the
-	 * hardware.
-	 * Always increase throttling if current bandwidth is above the
-	 * target set by user.
-	 * But avoid thrashing up and down on every poll by checking
-	 * whether a decrease in throttling is likely to push the group
-	 * back over target. E.g. if currently throttling to 30% of bandwidth
-	 * on a system with 10% granularity steps, check whether moving to
-	 * 40% would go past the limit by multiplying current bandwidth by
-	 * "(30 + 10) / 30".
-	 */
-	if (cur_msr_val > r_mba->membw.min_bw && user_bw < cur_bw) {
-		new_msr_val = cur_msr_val - r_mba->membw.bw_gran;
-	} else if (cur_msr_val < MAX_MBA_BW &&
-		   (user_bw > (cur_bw * (cur_msr_val + r_mba->membw.min_bw) / cur_msr_val))) {
-		new_msr_val = cur_msr_val + r_mba->membw.bw_gran;
-	} else {
-		return;
-	}
-
-	resctrl_arch_update_one(r_mba, dom_mba, closid, CDP_NONE, new_msr_val);
-}
-
-static void mbm_update(struct rdt_resource *r, struct rdt_domain *d,
-		       u32 closid, u32 rmid)
-{
-	struct rmid_read rr;
-
-	rr.first = false;
-	rr.r = r;
-	rr.d = d;
-
-	/*
-	 * This is protected from concurrent reads from user
-	 * as both the user and we hold the global mutex.
-	 */
-	if (resctrl_arch_is_mbm_total_enabled()) {
-		rr.evtid = QOS_L3_MBM_TOTAL_EVENT_ID;
-		rr.val = 0;
-		rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
-		if (IS_ERR(rr.arch_mon_ctx)) {
-			pr_warn_ratelimited("Failed to allocate monitor context: %ld",
-					    PTR_ERR(rr.arch_mon_ctx));
-			return;
-		}
-
-		__mon_event_count(closid, rmid, &rr);
-
-		resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
-	}
-	if (resctrl_arch_is_mbm_local_enabled()) {
-		rr.evtid = QOS_L3_MBM_LOCAL_EVENT_ID;
-		rr.val = 0;
-		rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
-		if (IS_ERR(rr.arch_mon_ctx)) {
-			pr_warn_ratelimited("Failed to allocate monitor context: %ld",
-					    PTR_ERR(rr.arch_mon_ctx));
-			return;
-		}
-
-		__mon_event_count(closid, rmid, &rr);
-
-		/*
-		 * Call the MBA software controller only for the
-		 * control groups and when user has enabled
-		 * the software controller explicitly.
-		 */
-		if (is_mba_sc(NULL))
-			mbm_bw_count(closid, rmid, &rr);
-
-		resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
-	}
-}
-
-/*
- * Handler to scan the limbo list and move the RMIDs
- * to free list whose occupancy < threshold_occupancy.
- */
-void cqm_handle_limbo(struct work_struct *work)
-{
-	unsigned long delay = msecs_to_jiffies(CQM_LIMBOCHECK_INTERVAL);
-	struct rdt_domain *d;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	d = container_of(work, struct rdt_domain, cqm_limbo.work);
-
-	__check_limbo(d, false);
-
-	if (has_busy_rmid(d)) {
-		d->cqm_work_cpu = cpumask_any_housekeeping(&d->cpu_mask,
-							   RESCTRL_PICK_ANY_CPU);
-		schedule_delayed_work_on(d->cqm_work_cpu, &d->cqm_limbo,
-					 delay);
-	}
-
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-}
-
-/**
- * cqm_setup_limbo_handler() - Schedule the limbo handler to run for this
- *                             domain.
- * @dom:           The domain the limbo handler should run for.
- * @delay_ms:      How far in the future the handler should run.
- * @exclude_cpu:   Which CPU the handler should not run on,
- *		   RESCTRL_PICK_ANY_CPU to pick any CPU.
- */
-void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms,
-			     int exclude_cpu)
-{
-	unsigned long delay = msecs_to_jiffies(delay_ms);
-	int cpu;
-
-	cpu = cpumask_any_housekeeping(&dom->cpu_mask, exclude_cpu);
-	dom->cqm_work_cpu = cpu;
-
-	if (cpu < nr_cpu_ids)
-		schedule_delayed_work_on(cpu, &dom->cqm_limbo, delay);
-}
-
-void mbm_handle_overflow(struct work_struct *work)
-{
-	unsigned long delay = msecs_to_jiffies(MBM_OVERFLOW_INTERVAL);
-	struct rdtgroup *prgrp, *crgrp;
-	struct list_head *head;
-	struct rdt_resource *r;
-	struct rdt_domain *d;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	/*
-	 * If the filesystem has been unmounted this work no longer needs to
-	 * run.
-	 */
-	if (!resctrl_mounted || !resctrl_arch_mon_capable())
-		goto out_unlock;
-
-	r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	d = container_of(work, struct rdt_domain, mbm_over.work);
-
-	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
-		mbm_update(r, d, prgrp->closid, prgrp->mon.rmid);
-
-		head = &prgrp->mon.crdtgrp_list;
-		list_for_each_entry(crgrp, head, mon.crdtgrp_list)
-			mbm_update(r, d, crgrp->closid, crgrp->mon.rmid);
-
-		if (is_mba_sc(NULL))
-			update_mba_bw(prgrp, d);
-	}
-
-	/*
-	 * Re-check for housekeeping CPUs. This allows the overflow handler to
-	 * move off a nohz_full CPU quickly.
-	 */
-	d->mbm_work_cpu = cpumask_any_housekeeping(&d->cpu_mask,
-						   RESCTRL_PICK_ANY_CPU);
-	schedule_delayed_work_on(d->mbm_work_cpu, &d->mbm_over, delay);
-
-out_unlock:
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-}
-
-/**
- * mbm_setup_overflow_handler() - Schedule the overflow handler to run for this
- *                                domain.
- * @dom:           The domain the overflow handler should run for.
- * @delay_ms:      How far in the future the handler should run.
- * @exclude_cpu:   Which CPU the handler should not run on,
- *		   RESCTRL_PICK_ANY_CPU to pick any CPU.
- */
-void mbm_setup_overflow_handler(struct rdt_domain *dom, unsigned long delay_ms,
-				int exclude_cpu)
-{
-	unsigned long delay = msecs_to_jiffies(delay_ms);
-	int cpu;
-
-	/*
-	 * When a domain comes online there is no guarantee the filesystem is
-	 * mounted. If not, there is no need to catch counter overflow.
-	 */
-	if (!resctrl_mounted || !resctrl_arch_mon_capable())
-		return;
-	cpu = cpumask_any_housekeeping(&dom->cpu_mask, exclude_cpu);
-	dom->mbm_work_cpu = cpu;
-
-	if (cpu < nr_cpu_ids)
-		schedule_delayed_work_on(cpu, &dom->mbm_over, delay);
-}
-
-static int dom_data_init(struct rdt_resource *r)
-{
-	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
-	u32 num_closid = resctrl_arch_get_num_closid(r);
-	struct rmid_entry *entry = NULL;
-	int err = 0, i;
-	u32 idx;
-
-	mutex_lock(&rdtgroup_mutex);
-	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
-		u32 *tmp;
-
-		/*
-		 * If the architecture hasn't provided a sanitised value here,
-		 * this may result in larger arrays than necessary. Resctrl will
-		 * use a smaller system wide value based on the resources in
-		 * use.
-		 */
-		tmp = kcalloc(num_closid, sizeof(*tmp), GFP_KERNEL);
-		if (!tmp) {
-			err = -ENOMEM;
-			goto out_unlock;
-		}
-
-		closid_num_dirty_rmid = tmp;
-	}
-
-	rmid_ptrs = kcalloc(idx_limit, sizeof(struct rmid_entry), GFP_KERNEL);
-	if (!rmid_ptrs) {
-		if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
-			kfree(closid_num_dirty_rmid);
-			closid_num_dirty_rmid = NULL;
-		}
-		err = -ENOMEM;
-		goto out_unlock;
-	}
-
-	for (i = 0; i < idx_limit; i++) {
-		entry = &rmid_ptrs[i];
-		INIT_LIST_HEAD(&entry->list);
-
-		resctrl_arch_rmid_idx_decode(i, &entry->closid, &entry->rmid);
-		list_add_tail(&entry->list, &rmid_free_lru);
-	}
-
-	/*
-	 * RESCTRL_RESERVED_CLOSID and RESCTRL_RESERVED_RMID are special and
-	 * are always allocated. These are used for the rdtgroup_default
-	 * control group, which will be setup later in rdtgroup_init().
-	 */
-	idx = resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
-					   RESCTRL_RESERVED_RMID);
-	entry = __rmid_entry(idx);
-	list_del(&entry->list);
-
-out_unlock:
-	mutex_unlock(&rdtgroup_mutex);
-
-	return err;
-}
-
-static void dom_data_exit(struct rdt_resource *r)
-{
-	if (!r->mon_capable)
-		return;
-
-	mutex_lock(&rdtgroup_mutex);
-	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
-		kfree(closid_num_dirty_rmid);
-		closid_num_dirty_rmid = NULL;
-	}
-
-	kfree(rmid_ptrs);
-	rmid_ptrs = NULL;
-
-	mutex_unlock(&rdtgroup_mutex);
-}
-
-static struct mon_evt llc_occupancy_event = {
-	.name		= "llc_occupancy",
-	.evtid		= QOS_L3_OCCUP_EVENT_ID,
-};
-
-static struct mon_evt mbm_total_event = {
-	.name		= "mbm_total_bytes",
-	.evtid		= QOS_L3_MBM_TOTAL_EVENT_ID,
-};
-
-static struct mon_evt mbm_local_event = {
-	.name		= "mbm_local_bytes",
-	.evtid		= QOS_L3_MBM_LOCAL_EVENT_ID,
-};
-
-/*
- * Initialize the event list for the resource.
- *
- * Note that MBM events are also part of RDT_RESOURCE_L3 resource
- * because as per the SDM the total and local memory bandwidth
- * are enumerated as part of L3 monitoring.
- */
-static void l3_mon_evt_init(struct rdt_resource *r)
-{
-	INIT_LIST_HEAD(&r->evt_list);
-
-	if (resctrl_arch_is_llc_occupancy_enabled())
-		list_add_tail(&llc_occupancy_event.list, &r->evt_list);
-	if (resctrl_arch_is_mbm_total_enabled())
-		list_add_tail(&mbm_total_event.list, &r->evt_list);
-	if (resctrl_arch_is_mbm_local_enabled())
-		list_add_tail(&mbm_local_event.list, &r->evt_list);
-}
-
-int resctrl_mon_resource_init(void)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	int ret;
-
-	if (!r->mon_capable)
-		return 0;
-
-	ret = dom_data_init(r);
-	if (ret)
-		return ret;
-
-	l3_mon_evt_init(r);
-
-	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_TOTAL_EVENT_ID)) {
-		mbm_total_event.configurable = true;
-		mbm_config_rftype_init("mbm_total_bytes_config");
-	}
-	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_LOCAL_EVENT_ID)) {
-		mbm_local_event.configurable = true;
-		mbm_config_rftype_init("mbm_local_bytes_config");
-	}
-
-	return 0;
-}
-
-void resctrl_mon_resource_exit(void)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-
-	dom_data_exit(r);
-}
diff --git a/fs/resctrl/psuedo_lock.c b/fs/resctrl/psuedo_lock.c
index 077c2abb6edd..e69de29bb2d1 100644
--- a/fs/resctrl/psuedo_lock.c
+++ b/fs/resctrl/psuedo_lock.c
@@ -1,1122 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Resource Director Technology (RDT)
- *
- * Pseudo-locking support built on top of Cache Allocation Technology (CAT)
- *
- * Copyright (C) 2018 Intel Corporation
- *
- * Author: Reinette Chatre <reinette.chatre@intel.com>
- */
-
-#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
-
-#include <linux/cacheinfo.h>
-#include <linux/cpu.h>
-#include <linux/cpumask.h>
-#include <linux/debugfs.h>
-#include <linux/kthread.h>
-#include <linux/mman.h>
-#include <linux/perf_event.h>
-#include <linux/pm_qos.h>
-#include <linux/slab.h>
-#include <linux/uaccess.h>
-
-#include <asm/cacheflush.h>
-#include <asm/resctrl.h>
-#include <asm/perf_event.h>
-
-#include "internal.h"
-
-/*
- * Major number assigned to and shared by all devices exposing
- * pseudo-locked regions.
- */
-static unsigned int pseudo_lock_major;
-static unsigned long pseudo_lock_minor_avail = GENMASK(MINORBITS, 0);
-
-static char *pseudo_lock_devnode(const struct device *dev, umode_t *mode)
-{
-	const struct rdtgroup *rdtgrp;
-
-	rdtgrp = dev_get_drvdata(dev);
-	if (mode)
-		*mode = 0600;
-	return kasprintf(GFP_KERNEL, "pseudo_lock/%s", rdtgrp->kn->name);
-}
-
-static const struct class pseudo_lock_class = {
-	.name = "pseudo_lock",
-	.devnode = pseudo_lock_devnode,
-};
-
-/**
- * pseudo_lock_minor_get - Obtain available minor number
- * @minor: Pointer to where new minor number will be stored
- *
- * A bitmask is used to track available minor numbers. Here the next free
- * minor number is marked as unavailable and returned.
- *
- * Return: 0 on success, <0 on failure.
- */
-static int pseudo_lock_minor_get(unsigned int *minor)
-{
-	unsigned long first_bit;
-
-	first_bit = find_first_bit(&pseudo_lock_minor_avail, MINORBITS);
-
-	if (first_bit == MINORBITS)
-		return -ENOSPC;
-
-	__clear_bit(first_bit, &pseudo_lock_minor_avail);
-	*minor = first_bit;
-
-	return 0;
-}
-
-/**
- * pseudo_lock_minor_release - Return minor number to available
- * @minor: The minor number made available
- */
-static void pseudo_lock_minor_release(unsigned int minor)
-{
-	__set_bit(minor, &pseudo_lock_minor_avail);
-}
-
-/**
- * region_find_by_minor - Locate a pseudo-lock region by inode minor number
- * @minor: The minor number of the device representing pseudo-locked region
- *
- * When the character device is accessed we need to determine which
- * pseudo-locked region it belongs to. This is done by matching the minor
- * number of the device to the pseudo-locked region it belongs.
- *
- * Minor numbers are assigned at the time a pseudo-locked region is associated
- * with a cache instance.
- *
- * Return: On success return pointer to resource group owning the pseudo-locked
- *         region, NULL on failure.
- */
-static struct rdtgroup *region_find_by_minor(unsigned int minor)
-{
-	struct rdtgroup *rdtgrp, *rdtgrp_match = NULL;
-
-	list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
-		if (rdtgrp->plr && rdtgrp->plr->minor == minor) {
-			rdtgrp_match = rdtgrp;
-			break;
-		}
-	}
-	return rdtgrp_match;
-}
-
-/**
- * struct pseudo_lock_pm_req - A power management QoS request list entry
- * @list:	Entry within the @pm_reqs list for a pseudo-locked region
- * @req:	PM QoS request
- */
-struct pseudo_lock_pm_req {
-	struct list_head list;
-	struct dev_pm_qos_request req;
-};
-
-static void pseudo_lock_cstates_relax(struct pseudo_lock_region *plr)
-{
-	struct pseudo_lock_pm_req *pm_req, *next;
-
-	list_for_each_entry_safe(pm_req, next, &plr->pm_reqs, list) {
-		dev_pm_qos_remove_request(&pm_req->req);
-		list_del(&pm_req->list);
-		kfree(pm_req);
-	}
-}
-
-/**
- * pseudo_lock_cstates_constrain - Restrict cores from entering C6
- * @plr: Pseudo-locked region
- *
- * To prevent the cache from being affected by power management entering
- * C6 has to be avoided. This is accomplished by requesting a latency
- * requirement lower than lowest C6 exit latency of all supported
- * platforms as found in the cpuidle state tables in the intel_idle driver.
- * At this time it is possible to do so with a single latency requirement
- * for all supported platforms.
- *
- * Since Goldmont is supported, which is affected by X86_BUG_MONITOR,
- * the ACPI latencies need to be considered while keeping in mind that C2
- * may be set to map to deeper sleep states. In this case the latency
- * requirement needs to prevent entering C2 also.
- *
- * Return: 0 on success, <0 on failure
- */
-static int pseudo_lock_cstates_constrain(struct pseudo_lock_region *plr)
-{
-	struct pseudo_lock_pm_req *pm_req;
-	int cpu;
-	int ret;
-
-	for_each_cpu(cpu, &plr->d->cpu_mask) {
-		pm_req = kzalloc(sizeof(*pm_req), GFP_KERNEL);
-		if (!pm_req) {
-			rdt_last_cmd_puts("Failure to allocate memory for PM QoS\n");
-			ret = -ENOMEM;
-			goto out_err;
-		}
-		ret = dev_pm_qos_add_request(get_cpu_device(cpu),
-					     &pm_req->req,
-					     DEV_PM_QOS_RESUME_LATENCY,
-					     30);
-		if (ret < 0) {
-			rdt_last_cmd_printf("Failed to add latency req CPU%d\n",
-					    cpu);
-			kfree(pm_req);
-			ret = -1;
-			goto out_err;
-		}
-		list_add(&pm_req->list, &plr->pm_reqs);
-	}
-
-	return 0;
-
-out_err:
-	pseudo_lock_cstates_relax(plr);
-	return ret;
-}
-
-/**
- * pseudo_lock_region_clear - Reset pseudo-lock region data
- * @plr: pseudo-lock region
- *
- * All content of the pseudo-locked region is reset - any memory allocated
- * freed.
- *
- * Return: void
- */
-static void pseudo_lock_region_clear(struct pseudo_lock_region *plr)
-{
-	plr->size = 0;
-	plr->line_size = 0;
-	kfree(plr->kmem);
-	plr->kmem = NULL;
-	plr->s = NULL;
-	if (plr->d)
-		plr->d->plr = NULL;
-	plr->d = NULL;
-	plr->cbm = 0;
-	plr->debugfs_dir = NULL;
-}
-
-/**
- * pseudo_lock_region_init - Initialize pseudo-lock region information
- * @plr: pseudo-lock region
- *
- * Called after user provided a schemata to be pseudo-locked. From the
- * schemata the &struct pseudo_lock_region is on entry already initialized
- * with the resource, domain, and capacity bitmask. Here the information
- * required for pseudo-locking is deduced from this data and &struct
- * pseudo_lock_region initialized further. This information includes:
- * - size in bytes of the region to be pseudo-locked
- * - cache line size to know the stride with which data needs to be accessed
- *   to be pseudo-locked
- * - a cpu associated with the cache instance on which the pseudo-locking
- *   flow can be executed
- *
- * Return: 0 on success, <0 on failure. Descriptive error will be written
- * to last_cmd_status buffer.
- */
-static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
-{
-	struct cpu_cacheinfo *ci;
-	int ret;
-	int i;
-
-	/* Pick the first cpu we find that is associated with the cache. */
-	plr->cpu = cpumask_first(&plr->d->cpu_mask);
-
-	if (!cpu_online(plr->cpu)) {
-		rdt_last_cmd_printf("CPU %u associated with cache not online\n",
-				    plr->cpu);
-		ret = -ENODEV;
-		goto out_region;
-	}
-
-	ci = get_cpu_cacheinfo(plr->cpu);
-
-	plr->size = rdtgroup_cbm_to_size(plr->s->res, plr->d, plr->cbm);
-
-	for (i = 0; i < ci->num_leaves; i++) {
-		if (ci->info_list[i].level == plr->s->res->cache_level) {
-			plr->line_size = ci->info_list[i].coherency_line_size;
-			return 0;
-		}
-	}
-
-	ret = -1;
-	rdt_last_cmd_puts("Unable to determine cache line size\n");
-out_region:
-	pseudo_lock_region_clear(plr);
-	return ret;
-}
-
-/**
- * pseudo_lock_init - Initialize a pseudo-lock region
- * @rdtgrp: resource group to which new pseudo-locked region will belong
- *
- * A pseudo-locked region is associated with a resource group. When this
- * association is created the pseudo-locked region is initialized. The
- * details of the pseudo-locked region are not known at this time so only
- * allocation is done and association established.
- *
- * Return: 0 on success, <0 on failure
- */
-static int pseudo_lock_init(struct rdtgroup *rdtgrp)
-{
-	struct pseudo_lock_region *plr;
-
-	plr = kzalloc(sizeof(*plr), GFP_KERNEL);
-	if (!plr)
-		return -ENOMEM;
-
-	init_waitqueue_head(&plr->lock_thread_wq);
-	INIT_LIST_HEAD(&plr->pm_reqs);
-	rdtgrp->plr = plr;
-	return 0;
-}
-
-/**
- * pseudo_lock_region_alloc - Allocate kernel memory that will be pseudo-locked
- * @plr: pseudo-lock region
- *
- * Initialize the details required to set up the pseudo-locked region and
- * allocate the contiguous memory that will be pseudo-locked to the cache.
- *
- * Return: 0 on success, <0 on failure.  Descriptive error will be written
- * to last_cmd_status buffer.
- */
-static int pseudo_lock_region_alloc(struct pseudo_lock_region *plr)
-{
-	int ret;
-
-	ret = pseudo_lock_region_init(plr);
-	if (ret < 0)
-		return ret;
-
-	/*
-	 * We do not yet support contiguous regions larger than
-	 * KMALLOC_MAX_SIZE.
-	 */
-	if (plr->size > KMALLOC_MAX_SIZE) {
-		rdt_last_cmd_puts("Requested region exceeds maximum size\n");
-		ret = -E2BIG;
-		goto out_region;
-	}
-
-	plr->kmem = kzalloc(plr->size, GFP_KERNEL);
-	if (!plr->kmem) {
-		rdt_last_cmd_puts("Unable to allocate memory\n");
-		ret = -ENOMEM;
-		goto out_region;
-	}
-
-	ret = 0;
-	goto out;
-out_region:
-	pseudo_lock_region_clear(plr);
-out:
-	return ret;
-}
-
-/**
- * pseudo_lock_free - Free a pseudo-locked region
- * @rdtgrp: resource group to which pseudo-locked region belonged
- *
- * The pseudo-locked region's resources have already been released, or not
- * yet created at this point. Now it can be freed and disassociated from the
- * resource group.
- *
- * Return: void
- */
-static void pseudo_lock_free(struct rdtgroup *rdtgrp)
-{
-	pseudo_lock_region_clear(rdtgrp->plr);
-	kfree(rdtgrp->plr);
-	rdtgrp->plr = NULL;
-}
-
-/**
- * rdtgroup_monitor_in_progress - Test if monitoring in progress
- * @rdtgrp: resource group being queried
- *
- * Return: 1 if monitor groups have been created for this resource
- * group, 0 otherwise.
- */
-static int rdtgroup_monitor_in_progress(struct rdtgroup *rdtgrp)
-{
-	return !list_empty(&rdtgrp->mon.crdtgrp_list);
-}
-
-/**
- * rdtgroup_locksetup_user_restrict - Restrict user access to group
- * @rdtgrp: resource group needing access restricted
- *
- * A resource group used for cache pseudo-locking cannot have cpus or tasks
- * assigned to it. This is communicated to the user by restricting access
- * to all the files that can be used to make such changes.
- *
- * Permissions restored with rdtgroup_locksetup_user_restore()
- *
- * Return: 0 on success, <0 on failure. If a failure occurs during the
- * restriction of access an attempt will be made to restore permissions but
- * the state of the mode of these files will be uncertain when a failure
- * occurs.
- */
-static int rdtgroup_locksetup_user_restrict(struct rdtgroup *rdtgrp)
-{
-	int ret;
-
-	ret = rdtgroup_kn_mode_restrict(rdtgrp, "tasks");
-	if (ret)
-		return ret;
-
-	ret = rdtgroup_kn_mode_restrict(rdtgrp, "cpus");
-	if (ret)
-		goto err_tasks;
-
-	ret = rdtgroup_kn_mode_restrict(rdtgrp, "cpus_list");
-	if (ret)
-		goto err_cpus;
-
-	if (resctrl_arch_mon_capable()) {
-		ret = rdtgroup_kn_mode_restrict(rdtgrp, "mon_groups");
-		if (ret)
-			goto err_cpus_list;
-	}
-
-	ret = 0;
-	goto out;
-
-err_cpus_list:
-	rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0777);
-err_cpus:
-	rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0777);
-err_tasks:
-	rdtgroup_kn_mode_restore(rdtgrp, "tasks", 0777);
-out:
-	return ret;
-}
-
-/**
- * rdtgroup_locksetup_user_restore - Restore user access to group
- * @rdtgrp: resource group needing access restored
- *
- * Restore all file access previously removed using
- * rdtgroup_locksetup_user_restrict()
- *
- * Return: 0 on success, <0 on failure.  If a failure occurs during the
- * restoration of access an attempt will be made to restrict permissions
- * again but the state of the mode of these files will be uncertain when
- * a failure occurs.
- */
-static int rdtgroup_locksetup_user_restore(struct rdtgroup *rdtgrp)
-{
-	int ret;
-
-	ret = rdtgroup_kn_mode_restore(rdtgrp, "tasks", 0777);
-	if (ret)
-		return ret;
-
-	ret = rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0777);
-	if (ret)
-		goto err_tasks;
-
-	ret = rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0777);
-	if (ret)
-		goto err_cpus;
-
-	if (resctrl_arch_mon_capable()) {
-		ret = rdtgroup_kn_mode_restore(rdtgrp, "mon_groups", 0777);
-		if (ret)
-			goto err_cpus_list;
-	}
-
-	ret = 0;
-	goto out;
-
-err_cpus_list:
-	rdtgroup_kn_mode_restrict(rdtgrp, "cpus_list");
-err_cpus:
-	rdtgroup_kn_mode_restrict(rdtgrp, "cpus");
-err_tasks:
-	rdtgroup_kn_mode_restrict(rdtgrp, "tasks");
-out:
-	return ret;
-}
-
-/**
- * rdtgroup_locksetup_enter - Resource group enters locksetup mode
- * @rdtgrp: resource group requested to enter locksetup mode
- *
- * A resource group enters locksetup mode to reflect that it would be used
- * to represent a pseudo-locked region and is in the process of being set
- * up to do so. A resource group used for a pseudo-locked region would
- * lose the closid associated with it so we cannot allow it to have any
- * tasks or cpus assigned nor permit tasks or cpus to be assigned in the
- * future. Monitoring of a pseudo-locked region is not allowed either.
- *
- * The above and more restrictions on a pseudo-locked region are checked
- * for and enforced before the resource group enters the locksetup mode.
- *
- * Returns: 0 if the resource group successfully entered locksetup mode, <0
- * on failure. On failure the last_cmd_status buffer is updated with text to
- * communicate details of failure to the user.
- */
-int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
-{
-	int ret;
-
-	/*
-	 * The default resource group can neither be removed nor lose the
-	 * default closid associated with it.
-	 */
-	if (rdtgrp == &rdtgroup_default) {
-		rdt_last_cmd_puts("Cannot pseudo-lock default group\n");
-		return -EINVAL;
-	}
-
-	/*
-	 * Cache Pseudo-locking not supported when CDP is enabled.
-	 *
-	 * Some things to consider if you would like to enable this
-	 * support (using L3 CDP as example):
-	 * - When CDP is enabled two separate resources are exposed,
-	 *   L3DATA and L3CODE, but they are actually on the same cache.
-	 *   The implication for pseudo-locking is that if a
-	 *   pseudo-locked region is created on a domain of one
-	 *   resource (eg. L3CODE), then a pseudo-locked region cannot
-	 *   be created on that same domain of the other resource
-	 *   (eg. L3DATA). This is because the creation of a
-	 *   pseudo-locked region involves a call to wbinvd that will
-	 *   affect all cache allocations on particular domain.
-	 * - Considering the previous, it may be possible to only
-	 *   expose one of the CDP resources to pseudo-locking and
-	 *   hide the other. For example, we could consider to only
-	 *   expose L3DATA and since the L3 cache is unified it is
-	 *   still possible to place instructions there are execute it.
-	 * - If only one region is exposed to pseudo-locking we should
-	 *   still keep in mind that availability of a portion of cache
-	 *   for pseudo-locking should take into account both resources.
-	 *   Similarly, if a pseudo-locked region is created in one
-	 *   resource, the portion of cache used by it should be made
-	 *   unavailable to all future allocations from both resources.
-	 */
-	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3) ||
-	    resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2)) {
-		rdt_last_cmd_puts("CDP enabled\n");
-		return -EINVAL;
-	}
-
-	/*
-	 * Not knowing the bits to disable prefetching implies that this
-	 * platform does not support Cache Pseudo-Locking.
-	 */
-	if (resctrl_arch_get_prefetch_disable_bits() == 0) {
-		rdt_last_cmd_puts("Pseudo-locking not supported\n");
-		return -EINVAL;
-	}
-
-	if (rdtgroup_monitor_in_progress(rdtgrp)) {
-		rdt_last_cmd_puts("Monitoring in progress\n");
-		return -EINVAL;
-	}
-
-	if (rdtgroup_tasks_assigned(rdtgrp)) {
-		rdt_last_cmd_puts("Tasks assigned to resource group\n");
-		return -EINVAL;
-	}
-
-	if (!cpumask_empty(&rdtgrp->cpu_mask)) {
-		rdt_last_cmd_puts("CPUs assigned to resource group\n");
-		return -EINVAL;
-	}
-
-	if (rdtgroup_locksetup_user_restrict(rdtgrp)) {
-		rdt_last_cmd_puts("Unable to modify resctrl permissions\n");
-		return -EIO;
-	}
-
-	ret = pseudo_lock_init(rdtgrp);
-	if (ret) {
-		rdt_last_cmd_puts("Unable to init pseudo-lock region\n");
-		goto out_release;
-	}
-
-	/*
-	 * If this system is capable of monitoring a rmid would have been
-	 * allocated when the control group was created. This is not needed
-	 * anymore when this group would be used for pseudo-locking. This
-	 * is safe to call on platforms not capable of monitoring.
-	 */
-	free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
-
-	ret = 0;
-	goto out;
-
-out_release:
-	rdtgroup_locksetup_user_restore(rdtgrp);
-out:
-	return ret;
-}
-
-/**
- * rdtgroup_locksetup_exit - resource group exist locksetup mode
- * @rdtgrp: resource group
- *
- * When a resource group exits locksetup mode the earlier restrictions are
- * lifted.
- *
- * Return: 0 on success, <0 on failure
- */
-int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
-{
-	int ret;
-
-	if (resctrl_arch_mon_capable()) {
-		ret = alloc_rmid(rdtgrp->closid);
-		if (ret < 0) {
-			rdt_last_cmd_puts("Out of RMIDs\n");
-			return ret;
-		}
-		rdtgrp->mon.rmid = ret;
-	}
-
-	ret = rdtgroup_locksetup_user_restore(rdtgrp);
-	if (ret) {
-		free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
-		return ret;
-	}
-
-	pseudo_lock_free(rdtgrp);
-	return 0;
-}
-
-/**
- * rdtgroup_cbm_overlaps_pseudo_locked - Test if CBM or portion is pseudo-locked
- * @d: RDT domain
- * @cbm: CBM to test
- *
- * @d represents a cache instance and @cbm a capacity bitmask that is
- * considered for it. Determine if @cbm overlaps with any existing
- * pseudo-locked region on @d.
- *
- * @cbm is unsigned long, even if only 32 bits are used, to make the
- * bitmap functions work correctly.
- *
- * Return: true if @cbm overlaps with pseudo-locked region on @d, false
- * otherwise.
- */
-bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm)
-{
-	unsigned int cbm_len;
-	unsigned long cbm_b;
-
-	if (d->plr) {
-		cbm_len = d->plr->s->res->cache.cbm_len;
-		cbm_b = d->plr->cbm;
-		if (bitmap_intersects(&cbm, &cbm_b, cbm_len))
-			return true;
-	}
-	return false;
-}
-
-/**
- * rdtgroup_pseudo_locked_in_hierarchy - Pseudo-locked region in cache hierarchy
- * @d: RDT domain under test
- *
- * The setup of a pseudo-locked region affects all cache instances within
- * the hierarchy of the region. It is thus essential to know if any
- * pseudo-locked regions exist within a cache hierarchy to prevent any
- * attempts to create new pseudo-locked regions in the same hierarchy.
- *
- * Return: true if a pseudo-locked region exists in the hierarchy of @d or
- *         if it is not possible to test due to memory allocation issue,
- *         false otherwise.
- */
-bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
-{
-	cpumask_var_t cpu_with_psl;
-	enum resctrl_res_level i;
-	struct rdt_resource *r;
-	struct rdt_domain *d_i;
-	bool ret = false;
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	if (!zalloc_cpumask_var(&cpu_with_psl, GFP_KERNEL))
-		return true;
-
-	/*
-	 * First determine which cpus have pseudo-locked regions
-	 * associated with them.
-	 */
-	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
-		r = resctrl_arch_get_resource(i);
-		if (!r->alloc_capable)
-			continue;
-
-		list_for_each_entry(d_i, &r->domains, list) {
-			if (d_i->plr)
-				cpumask_or(cpu_with_psl, cpu_with_psl,
-					   &d_i->cpu_mask);
-		}
-	}
-
-	/*
-	 * Next test if new pseudo-locked region would intersect with
-	 * existing region.
-	 */
-	if (cpumask_intersects(&d->cpu_mask, cpu_with_psl))
-		ret = true;
-
-	free_cpumask_var(cpu_with_psl);
-	return ret;
-}
-
-/**
- * pseudo_lock_measure_cycles - Trigger latency measure to pseudo-locked region
- * @rdtgrp: Resource group to which the pseudo-locked region belongs.
- * @sel: Selector of which measurement to perform on a pseudo-locked region.
- *
- * The measurement of latency to access a pseudo-locked region should be
- * done from a cpu that is associated with that pseudo-locked region.
- * Determine which cpu is associated with this region and start a thread on
- * that cpu to perform the measurement, wait for that thread to complete.
- *
- * Return: 0 on success, <0 on failure
- */
-static int pseudo_lock_measure_cycles(struct rdtgroup *rdtgrp, int sel)
-{
-	struct pseudo_lock_region *plr = rdtgrp->plr;
-	struct task_struct *thread;
-	unsigned int cpu;
-	int ret = -1;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	if (rdtgrp->flags & RDT_DELETED) {
-		ret = -ENODEV;
-		goto out;
-	}
-
-	if (!plr->d) {
-		ret = -ENODEV;
-		goto out;
-	}
-
-	plr->thread_done = 0;
-	cpu = cpumask_first(&plr->d->cpu_mask);
-	if (!cpu_online(cpu)) {
-		ret = -ENODEV;
-		goto out;
-	}
-
-	plr->cpu = cpu;
-
-	if (sel == 1)
-		thread = kthread_create_on_node(resctrl_arch_measure_cycles_lat_fn,
-						plr, cpu_to_node(cpu),
-						"pseudo_lock_measure/%u",
-						cpu);
-	else if (sel == 2)
-		thread = kthread_create_on_node(resctrl_arch_measure_l2_residency,
-						plr, cpu_to_node(cpu),
-						"pseudo_lock_measure/%u",
-						cpu);
-	else if (sel == 3)
-		thread = kthread_create_on_node(resctrl_arch_measure_l3_residency,
-						plr, cpu_to_node(cpu),
-						"pseudo_lock_measure/%u",
-						cpu);
-	else
-		goto out;
-
-	if (IS_ERR(thread)) {
-		ret = PTR_ERR(thread);
-		goto out;
-	}
-	kthread_bind(thread, cpu);
-	wake_up_process(thread);
-
-	ret = wait_event_interruptible(plr->lock_thread_wq,
-				       plr->thread_done == 1);
-	if (ret < 0)
-		goto out;
-
-	ret = 0;
-
-out:
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-	return ret;
-}
-
-static ssize_t pseudo_lock_measure_trigger(struct file *file,
-					   const char __user *user_buf,
-					   size_t count, loff_t *ppos)
-{
-	struct rdtgroup *rdtgrp = file->private_data;
-	size_t buf_size;
-	char buf[32];
-	int ret;
-	int sel;
-
-	buf_size = min(count, (sizeof(buf) - 1));
-	if (copy_from_user(buf, user_buf, buf_size))
-		return -EFAULT;
-
-	buf[buf_size] = '\0';
-	ret = kstrtoint(buf, 10, &sel);
-	if (ret == 0) {
-		if (sel != 1 && sel != 2 && sel != 3)
-			return -EINVAL;
-		ret = debugfs_file_get(file->f_path.dentry);
-		if (ret)
-			return ret;
-		ret = pseudo_lock_measure_cycles(rdtgrp, sel);
-		if (ret == 0)
-			ret = count;
-		debugfs_file_put(file->f_path.dentry);
-	}
-
-	return ret;
-}
-
-static const struct file_operations pseudo_measure_fops = {
-	.write = pseudo_lock_measure_trigger,
-	.open = simple_open,
-	.llseek = default_llseek,
-};
-
-/**
- * rdtgroup_pseudo_lock_create - Create a pseudo-locked region
- * @rdtgrp: resource group to which pseudo-lock region belongs
- *
- * Called when a resource group in the pseudo-locksetup mode receives a
- * valid schemata that should be pseudo-locked. Since the resource group is
- * in pseudo-locksetup mode the &struct pseudo_lock_region has already been
- * allocated and initialized with the essential information. If a failure
- * occurs the resource group remains in the pseudo-locksetup mode with the
- * &struct pseudo_lock_region associated with it, but cleared from all
- * information and ready for the user to re-attempt pseudo-locking by
- * writing the schemata again.
- *
- * Return: 0 if the pseudo-locked region was successfully pseudo-locked, <0
- * on failure. Descriptive error will be written to last_cmd_status buffer.
- */
-int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
-{
-	struct pseudo_lock_region *plr = rdtgrp->plr;
-	struct task_struct *thread;
-	unsigned int new_minor;
-	struct device *dev;
-	int ret;
-
-	ret = pseudo_lock_region_alloc(plr);
-	if (ret < 0)
-		return ret;
-
-	ret = pseudo_lock_cstates_constrain(plr);
-	if (ret < 0) {
-		ret = -EINVAL;
-		goto out_region;
-	}
-
-	plr->thread_done = 0;
-
-	plr->closid = rdtgrp->closid;
-	thread = kthread_create_on_node(resctrl_arch_pseudo_lock_fn, plr,
-					cpu_to_node(plr->cpu),
-					"pseudo_lock/%u", plr->cpu);
-	if (IS_ERR(thread)) {
-		ret = PTR_ERR(thread);
-		rdt_last_cmd_printf("Locking thread returned error %d\n", ret);
-		goto out_cstates;
-	}
-
-	kthread_bind(thread, plr->cpu);
-	wake_up_process(thread);
-
-	ret = wait_event_interruptible(plr->lock_thread_wq,
-				       plr->thread_done == 1);
-	if (ret < 0) {
-		/*
-		 * If the thread does not get on the CPU for whatever
-		 * reason and the process which sets up the region is
-		 * interrupted then this will leave the thread in runnable
-		 * state and once it gets on the CPU it will dereference
-		 * the cleared, but not freed, plr struct resulting in an
-		 * empty pseudo-locking loop.
-		 */
-		rdt_last_cmd_puts("Locking thread interrupted\n");
-		goto out_cstates;
-	}
-
-	ret = pseudo_lock_minor_get(&new_minor);
-	if (ret < 0) {
-		rdt_last_cmd_puts("Unable to obtain a new minor number\n");
-		goto out_cstates;
-	}
-
-	/*
-	 * Unlock access but do not release the reference. The
-	 * pseudo-locked region will still be here on return.
-	 *
-	 * The mutex has to be released temporarily to avoid a potential
-	 * deadlock with the mm->mmap_lock which is obtained in the
-	 * device_create() and debugfs_create_dir() callpath below as well as
-	 * before the mmap() callback is called.
-	 */
-	mutex_unlock(&rdtgroup_mutex);
-
-	if (!IS_ERR_OR_NULL(debugfs_resctrl)) {
-		plr->debugfs_dir = debugfs_create_dir(rdtgrp->kn->name,
-						      debugfs_resctrl);
-		if (!IS_ERR_OR_NULL(plr->debugfs_dir))
-			debugfs_create_file("pseudo_lock_measure", 0200,
-					    plr->debugfs_dir, rdtgrp,
-					    &pseudo_measure_fops);
-	}
-
-	dev = device_create(&pseudo_lock_class, NULL,
-			    MKDEV(pseudo_lock_major, new_minor),
-			    rdtgrp, "%s", rdtgrp->kn->name);
-
-	mutex_lock(&rdtgroup_mutex);
-
-	if (IS_ERR(dev)) {
-		ret = PTR_ERR(dev);
-		rdt_last_cmd_printf("Failed to create character device: %d\n",
-				    ret);
-		goto out_debugfs;
-	}
-
-	/* We released the mutex - check if group was removed while we did so */
-	if (rdtgrp->flags & RDT_DELETED) {
-		ret = -ENODEV;
-		goto out_device;
-	}
-
-	plr->minor = new_minor;
-
-	rdtgrp->mode = RDT_MODE_PSEUDO_LOCKED;
-	closid_free(rdtgrp->closid);
-	rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0444);
-	rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0444);
-
-	ret = 0;
-	goto out;
-
-out_device:
-	device_destroy(&pseudo_lock_class, MKDEV(pseudo_lock_major, new_minor));
-out_debugfs:
-	debugfs_remove_recursive(plr->debugfs_dir);
-	pseudo_lock_minor_release(new_minor);
-out_cstates:
-	pseudo_lock_cstates_relax(plr);
-out_region:
-	pseudo_lock_region_clear(plr);
-out:
-	return ret;
-}
-
-/**
- * rdtgroup_pseudo_lock_remove - Remove a pseudo-locked region
- * @rdtgrp: resource group to which the pseudo-locked region belongs
- *
- * The removal of a pseudo-locked region can be initiated when the resource
- * group is removed from user space via a "rmdir" from userspace or the
- * unmount of the resctrl filesystem. On removal the resource group does
- * not go back to pseudo-locksetup mode before it is removed, instead it is
- * removed directly. There is thus asymmetry with the creation where the
- * &struct pseudo_lock_region is removed here while it was not created in
- * rdtgroup_pseudo_lock_create().
- *
- * Return: void
- */
-void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp)
-{
-	struct pseudo_lock_region *plr = rdtgrp->plr;
-
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-		/*
-		 * Default group cannot be a pseudo-locked region so we can
-		 * free closid here.
-		 */
-		closid_free(rdtgrp->closid);
-		goto free;
-	}
-
-	pseudo_lock_cstates_relax(plr);
-	debugfs_remove_recursive(rdtgrp->plr->debugfs_dir);
-	device_destroy(&pseudo_lock_class, MKDEV(pseudo_lock_major, plr->minor));
-	pseudo_lock_minor_release(plr->minor);
-
-free:
-	pseudo_lock_free(rdtgrp);
-}
-
-static int pseudo_lock_dev_open(struct inode *inode, struct file *filp)
-{
-	struct rdtgroup *rdtgrp;
-
-	mutex_lock(&rdtgroup_mutex);
-
-	rdtgrp = region_find_by_minor(iminor(inode));
-	if (!rdtgrp) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -ENODEV;
-	}
-
-	filp->private_data = rdtgrp;
-	atomic_inc(&rdtgrp->waitcount);
-	/* Perform a non-seekable open - llseek is not supported */
-	filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
-
-	mutex_unlock(&rdtgroup_mutex);
-
-	return 0;
-}
-
-static int pseudo_lock_dev_release(struct inode *inode, struct file *filp)
-{
-	struct rdtgroup *rdtgrp;
-
-	mutex_lock(&rdtgroup_mutex);
-	rdtgrp = filp->private_data;
-	WARN_ON(!rdtgrp);
-	if (!rdtgrp) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -ENODEV;
-	}
-	filp->private_data = NULL;
-	atomic_dec(&rdtgrp->waitcount);
-	mutex_unlock(&rdtgroup_mutex);
-	return 0;
-}
-
-static int pseudo_lock_dev_mremap(struct vm_area_struct *area)
-{
-	/* Not supported */
-	return -EINVAL;
-}
-
-static const struct vm_operations_struct pseudo_mmap_ops = {
-	.mremap = pseudo_lock_dev_mremap,
-};
-
-static int pseudo_lock_dev_mmap(struct file *filp, struct vm_area_struct *vma)
-{
-	unsigned long vsize = vma->vm_end - vma->vm_start;
-	unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
-	struct pseudo_lock_region *plr;
-	struct rdtgroup *rdtgrp;
-	unsigned long physical;
-	unsigned long psize;
-
-	mutex_lock(&rdtgroup_mutex);
-
-	rdtgrp = filp->private_data;
-	WARN_ON(!rdtgrp);
-	if (!rdtgrp) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -ENODEV;
-	}
-
-	plr = rdtgrp->plr;
-
-	if (!plr->d) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -ENODEV;
-	}
-
-	/*
-	 * Task is required to run with affinity to the cpus associated
-	 * with the pseudo-locked region. If this is not the case the task
-	 * may be scheduled elsewhere and invalidate entries in the
-	 * pseudo-locked region.
-	 */
-	if (!cpumask_subset(current->cpus_ptr, &plr->d->cpu_mask)) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -EINVAL;
-	}
-
-	physical = __pa(plr->kmem) >> PAGE_SHIFT;
-	psize = plr->size - off;
-
-	if (off > plr->size) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -ENOSPC;
-	}
-
-	/*
-	 * Ensure changes are carried directly to the memory being mapped,
-	 * do not allow copy-on-write mapping.
-	 */
-	if (!(vma->vm_flags & VM_SHARED)) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -EINVAL;
-	}
-
-	if (vsize > psize) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -ENOSPC;
-	}
-
-	memset(plr->kmem + off, 0, vsize);
-
-	if (remap_pfn_range(vma, vma->vm_start, physical + vma->vm_pgoff,
-			    vsize, vma->vm_page_prot)) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -EAGAIN;
-	}
-	vma->vm_ops = &pseudo_mmap_ops;
-	mutex_unlock(&rdtgroup_mutex);
-	return 0;
-}
-
-static const struct file_operations pseudo_lock_dev_fops = {
-	.owner =	THIS_MODULE,
-	.llseek =	no_llseek,
-	.read =		NULL,
-	.write =	NULL,
-	.open =		pseudo_lock_dev_open,
-	.release =	pseudo_lock_dev_release,
-	.mmap =		pseudo_lock_dev_mmap,
-};
-
-int rdt_pseudo_lock_init(void)
-{
-	int ret;
-
-	ret = register_chrdev(0, "pseudo_lock", &pseudo_lock_dev_fops);
-	if (ret < 0)
-		return ret;
-
-	pseudo_lock_major = ret;
-
-	ret = class_register(&pseudo_lock_class);
-	if (ret) {
-		unregister_chrdev(pseudo_lock_major, "pseudo_lock");
-		return ret;
-	}
-
-	return 0;
-}
-
-void rdt_pseudo_lock_release(void)
-{
-	class_unregister(&pseudo_lock_class);
-	unregister_chrdev(pseudo_lock_major, "pseudo_lock");
-	pseudo_lock_major = 0;
-}
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 936fc6e47386..e69de29bb2d1 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -1,4013 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * User interface for Resource Allocation in Resource Director Technology(RDT)
- *
- * Copyright (C) 2016 Intel Corporation
- *
- * Author: Fenghua Yu <fenghua.yu@intel.com>
- *
- * More information about RDT be found in the Intel (R) x86 Architecture
- * Software Developer Manual.
- */
-
-#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
-
-#include <linux/cacheinfo.h>
-#include <linux/cpu.h>
-#include <linux/debugfs.h>
-#include <linux/fs.h>
-#include <linux/fs_parser.h>
-#include <linux/sysfs.h>
-#include <linux/kernfs.h>
-#include <linux/seq_buf.h>
-#include <linux/seq_file.h>
-#include <linux/sched/signal.h>
-#include <linux/sched/task.h>
-#include <linux/slab.h>
-#include <linux/task_work.h>
-#include <linux/user_namespace.h>
-
-#include <uapi/linux/magic.h>
-
-#include <asm/resctrl.h>
-#include "internal.h"
-
-/* Mutex to protect rdtgroup access. */
-DEFINE_MUTEX(rdtgroup_mutex);
-
-static struct kernfs_root *rdt_root;
-struct rdtgroup rdtgroup_default;
-LIST_HEAD(rdt_all_groups);
-
-/* list of entries for the schemata file */
-LIST_HEAD(resctrl_schema_all);
-
-/* The filesystem can only be mounted once. */
-bool resctrl_mounted;
-
-/* Kernel fs node for "info" directory under root */
-static struct kernfs_node *kn_info;
-
-/* Kernel fs node for "mon_groups" directory under root */
-static struct kernfs_node *kn_mongrp;
-
-/* Kernel fs node for "mon_data" directory under root */
-static struct kernfs_node *kn_mondata;
-
-/*
- * Used to store the max resource name width and max resource data width
- * to display the schemata in a tabular format
- */
-int max_name_width, max_data_width;
-
-static struct seq_buf last_cmd_status;
-static char last_cmd_status_buf[512];
-
-static int rdtgroup_setup_root(struct rdt_fs_context *ctx);
-static void rdtgroup_destroy_root(void);
-
-struct dentry *debugfs_resctrl;
-
-static bool resctrl_debug;
-
-void rdt_last_cmd_clear(void)
-{
-	lockdep_assert_held(&rdtgroup_mutex);
-	seq_buf_clear(&last_cmd_status);
-}
-
-void rdt_last_cmd_puts(const char *s)
-{
-	lockdep_assert_held(&rdtgroup_mutex);
-	seq_buf_puts(&last_cmd_status, s);
-}
-
-void rdt_last_cmd_printf(const char *fmt, ...)
-{
-	va_list ap;
-
-	va_start(ap, fmt);
-	lockdep_assert_held(&rdtgroup_mutex);
-	seq_buf_vprintf(&last_cmd_status, fmt, ap);
-	va_end(ap);
-}
-
-void rdt_staged_configs_clear(void)
-{
-	enum resctrl_res_level i;
-	struct rdt_resource *r;
-	struct rdt_domain *dom;
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
-		r = resctrl_arch_get_resource(i);
-		if (!r->alloc_capable)
-			continue;
-
-		list_for_each_entry(dom, &r->domains, list)
-			memset(dom->staged_config, 0, sizeof(dom->staged_config));
-	}
-}
-
-static bool resctrl_is_mbm_enabled(void)
-{
-	return (resctrl_arch_is_mbm_total_enabled() ||
-		resctrl_arch_is_mbm_local_enabled());
-}
-
-static bool resctrl_is_mbm_event(int e)
-{
-	return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
-		e <= QOS_L3_MBM_LOCAL_EVENT_ID);
-}
-
-/*
- * Trivial allocator for CLOSIDs. Since h/w only supports a small number,
- * we can keep a bitmap of free CLOSIDs in a single integer.
- *
- * Using a global CLOSID across all resources has some advantages and
- * some drawbacks:
- * + We can simply set current's closid to assign a task to a resource
- *   group.
- * + Context switch code can avoid extra memory references deciding which
- *   CLOSID to load into the PQR_ASSOC MSR
- * - We give up some options in configuring resource groups across multi-socket
- *   systems.
- * - Our choices on how to configure each resource become progressively more
- *   limited as the number of resources grows.
- */
-static unsigned long closid_free_map;
-static int closid_free_map_len;
-
-int closids_supported(void)
-{
-	return closid_free_map_len;
-}
-
-static void closid_init(void)
-{
-	struct resctrl_schema *s;
-	u32 rdt_min_closid = 32;
-
-	/* Compute rdt_min_closid across all resources */
-	list_for_each_entry(s, &resctrl_schema_all, list)
-		rdt_min_closid = min(rdt_min_closid, s->num_closid);
-
-	closid_free_map = BIT_MASK(rdt_min_closid) - 1;
-
-	/* RESCTRL_RESERVED_CLOSID is always reserved for the default group */
-	__clear_bit(RESCTRL_RESERVED_CLOSID, &closid_free_map);
-	closid_free_map_len = rdt_min_closid;
-}
-
-static int closid_alloc(void)
-{
-	int cleanest_closid;
-	u32 closid;
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID) &&
-	    resctrl_arch_is_llc_occupancy_enabled()) {
-		cleanest_closid = resctrl_find_cleanest_closid();
-		if (cleanest_closid < 0)
-			return cleanest_closid;
-		closid = cleanest_closid;
-	} else {
-		closid = ffs(closid_free_map);
-		if (closid == 0)
-			return -ENOSPC;
-		closid--;
-	}
-	__clear_bit(closid, &closid_free_map);
-
-	return closid;
-}
-
-void closid_free(int closid)
-{
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	__set_bit(closid, &closid_free_map);
-}
-
-/**
- * closid_allocated - test if provided closid is in use
- * @closid: closid to be tested
- *
- * Return: true if @closid is currently associated with a resource group,
- * false if @closid is free
- */
-bool closid_allocated(unsigned int closid)
-{
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	return !test_bit(closid, &closid_free_map);
-}
-
-/**
- * rdtgroup_mode_by_closid - Return mode of resource group with closid
- * @closid: closid if the resource group
- *
- * Each resource group is associated with a @closid. Here the mode
- * of a resource group can be queried by searching for it using its closid.
- *
- * Return: mode as &enum rdtgrp_mode of resource group with closid @closid
- */
-enum rdtgrp_mode rdtgroup_mode_by_closid(int closid)
-{
-	struct rdtgroup *rdtgrp;
-
-	list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
-		if (rdtgrp->closid == closid)
-			return rdtgrp->mode;
-	}
-
-	return RDT_NUM_MODES;
-}
-
-static const char * const rdt_mode_str[] = {
-	[RDT_MODE_SHAREABLE]		= "shareable",
-	[RDT_MODE_EXCLUSIVE]		= "exclusive",
-	[RDT_MODE_PSEUDO_LOCKSETUP]	= "pseudo-locksetup",
-	[RDT_MODE_PSEUDO_LOCKED]	= "pseudo-locked",
-};
-
-/**
- * rdtgroup_mode_str - Return the string representation of mode
- * @mode: the resource group mode as &enum rdtgroup_mode
- *
- * Return: string representation of valid mode, "unknown" otherwise
- */
-static const char *rdtgroup_mode_str(enum rdtgrp_mode mode)
-{
-	if (mode < RDT_MODE_SHAREABLE || mode >= RDT_NUM_MODES)
-		return "unknown";
-
-	return rdt_mode_str[mode];
-}
-
-/* set uid and gid of rdtgroup dirs and files to that of the creator */
-static int rdtgroup_kn_set_ugid(struct kernfs_node *kn)
-{
-	struct iattr iattr = { .ia_valid = ATTR_UID | ATTR_GID,
-				.ia_uid = current_fsuid(),
-				.ia_gid = current_fsgid(), };
-
-	if (uid_eq(iattr.ia_uid, GLOBAL_ROOT_UID) &&
-	    gid_eq(iattr.ia_gid, GLOBAL_ROOT_GID))
-		return 0;
-
-	return kernfs_setattr(kn, &iattr);
-}
-
-static int rdtgroup_add_file(struct kernfs_node *parent_kn, struct rftype *rft)
-{
-	struct kernfs_node *kn;
-	int ret;
-
-	kn = __kernfs_create_file(parent_kn, rft->name, rft->mode,
-				  GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
-				  0, rft->kf_ops, rft, NULL, NULL);
-	if (IS_ERR(kn))
-		return PTR_ERR(kn);
-
-	ret = rdtgroup_kn_set_ugid(kn);
-	if (ret) {
-		kernfs_remove(kn);
-		return ret;
-	}
-
-	return 0;
-}
-
-static int rdtgroup_seqfile_show(struct seq_file *m, void *arg)
-{
-	struct kernfs_open_file *of = m->private;
-	struct rftype *rft = of->kn->priv;
-
-	if (rft->seq_show)
-		return rft->seq_show(of, m, arg);
-	return 0;
-}
-
-static ssize_t rdtgroup_file_write(struct kernfs_open_file *of, char *buf,
-				   size_t nbytes, loff_t off)
-{
-	struct rftype *rft = of->kn->priv;
-
-	if (rft->write)
-		return rft->write(of, buf, nbytes, off);
-
-	return -EINVAL;
-}
-
-static const struct kernfs_ops rdtgroup_kf_single_ops = {
-	.atomic_write_len	= PAGE_SIZE,
-	.write			= rdtgroup_file_write,
-	.seq_show		= rdtgroup_seqfile_show,
-};
-
-static const struct kernfs_ops kf_mondata_ops = {
-	.atomic_write_len	= PAGE_SIZE,
-	.seq_show		= rdtgroup_mondata_show,
-};
-
-static bool is_cpu_list(struct kernfs_open_file *of)
-{
-	struct rftype *rft = of->kn->priv;
-
-	return rft->flags & RFTYPE_FLAGS_CPUS_LIST;
-}
-
-static int rdtgroup_cpus_show(struct kernfs_open_file *of,
-			      struct seq_file *s, void *v)
-{
-	struct rdtgroup *rdtgrp;
-	struct cpumask *mask;
-	int ret = 0;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-
-	if (rdtgrp) {
-		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
-			if (!rdtgrp->plr->d) {
-				rdt_last_cmd_clear();
-				rdt_last_cmd_puts("Cache domain offline\n");
-				ret = -ENODEV;
-			} else {
-				mask = &rdtgrp->plr->d->cpu_mask;
-				seq_printf(s, is_cpu_list(of) ?
-					   "%*pbl\n" : "%*pb\n",
-					   cpumask_pr_args(mask));
-			}
-		} else {
-			seq_printf(s, is_cpu_list(of) ? "%*pbl\n" : "%*pb\n",
-				   cpumask_pr_args(&rdtgrp->cpu_mask));
-		}
-	} else {
-		ret = -ENOENT;
-	}
-	rdtgroup_kn_unlock(of->kn);
-
-	return ret;
-}
-
-/*
- * Update the PGR_ASSOC MSR on all cpus in @cpu_mask,
- *
- * Per task closids/rmids must have been set up before calling this function.
- * @r may be NULL.
- */
-static void
-update_closid_rmid(const struct cpumask *cpu_mask, struct rdtgroup *r)
-{
-	struct resctrl_cpu_sync defaults;
-	struct resctrl_cpu_sync *defaults_p = NULL;
-
-	if (r) {
-		defaults.closid = r->closid;
-		defaults.rmid = r->mon.rmid;
-		defaults_p = &defaults;
-	}
-
-	on_each_cpu_mask(cpu_mask, resctrl_arch_sync_cpu_defaults, defaults_p,
-			 1);
-}
-
-static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
-			  cpumask_var_t tmpmask)
-{
-	struct rdtgroup *prgrp = rdtgrp->mon.parent, *crgrp;
-	struct list_head *head;
-
-	/* Check whether cpus belong to parent ctrl group */
-	cpumask_andnot(tmpmask, newmask, &prgrp->cpu_mask);
-	if (!cpumask_empty(tmpmask)) {
-		rdt_last_cmd_puts("Can only add CPUs to mongroup that belong to parent\n");
-		return -EINVAL;
-	}
-
-	/* Check whether cpus are dropped from this group */
-	cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
-	if (!cpumask_empty(tmpmask)) {
-		/* Give any dropped cpus to parent rdtgroup */
-		cpumask_or(&prgrp->cpu_mask, &prgrp->cpu_mask, tmpmask);
-		update_closid_rmid(tmpmask, prgrp);
-	}
-
-	/*
-	 * If we added cpus, remove them from previous group that owned them
-	 * and update per-cpu rmid
-	 */
-	cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask);
-	if (!cpumask_empty(tmpmask)) {
-		head = &prgrp->mon.crdtgrp_list;
-		list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
-			if (crgrp == rdtgrp)
-				continue;
-			cpumask_andnot(&crgrp->cpu_mask, &crgrp->cpu_mask,
-				       tmpmask);
-		}
-		update_closid_rmid(tmpmask, rdtgrp);
-	}
-
-	/* Done pushing/pulling - update this group with new mask */
-	cpumask_copy(&rdtgrp->cpu_mask, newmask);
-
-	return 0;
-}
-
-static void cpumask_rdtgrp_clear(struct rdtgroup *r, struct cpumask *m)
-{
-	struct rdtgroup *crgrp;
-
-	cpumask_andnot(&r->cpu_mask, &r->cpu_mask, m);
-	/* update the child mon group masks as well*/
-	list_for_each_entry(crgrp, &r->mon.crdtgrp_list, mon.crdtgrp_list)
-		cpumask_and(&crgrp->cpu_mask, &r->cpu_mask, &crgrp->cpu_mask);
-}
-
-static int cpus_ctrl_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
-			   cpumask_var_t tmpmask, cpumask_var_t tmpmask1)
-{
-	struct rdtgroup *r, *crgrp;
-	struct list_head *head;
-
-	/* Check whether cpus are dropped from this group */
-	cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
-	if (!cpumask_empty(tmpmask)) {
-		/* Can't drop from default group */
-		if (rdtgrp == &rdtgroup_default) {
-			rdt_last_cmd_puts("Can't drop CPUs from default group\n");
-			return -EINVAL;
-		}
-
-		/* Give any dropped cpus to rdtgroup_default */
-		cpumask_or(&rdtgroup_default.cpu_mask,
-			   &rdtgroup_default.cpu_mask, tmpmask);
-		update_closid_rmid(tmpmask, &rdtgroup_default);
-	}
-
-	/*
-	 * If we added cpus, remove them from previous group and
-	 * the prev group's child groups that owned them
-	 * and update per-cpu closid/rmid.
-	 */
-	cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask);
-	if (!cpumask_empty(tmpmask)) {
-		list_for_each_entry(r, &rdt_all_groups, rdtgroup_list) {
-			if (r == rdtgrp)
-				continue;
-			cpumask_and(tmpmask1, &r->cpu_mask, tmpmask);
-			if (!cpumask_empty(tmpmask1))
-				cpumask_rdtgrp_clear(r, tmpmask1);
-		}
-		update_closid_rmid(tmpmask, rdtgrp);
-	}
-
-	/* Done pushing/pulling - update this group with new mask */
-	cpumask_copy(&rdtgrp->cpu_mask, newmask);
-
-	/*
-	 * Clear child mon group masks since there is a new parent mask
-	 * now and update the rmid for the cpus the child lost.
-	 */
-	head = &rdtgrp->mon.crdtgrp_list;
-	list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
-		cpumask_and(tmpmask, &rdtgrp->cpu_mask, &crgrp->cpu_mask);
-		update_closid_rmid(tmpmask, rdtgrp);
-		cpumask_clear(&crgrp->cpu_mask);
-	}
-
-	return 0;
-}
-
-static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of,
-				   char *buf, size_t nbytes, loff_t off)
-{
-	cpumask_var_t tmpmask, newmask, tmpmask1;
-	struct rdtgroup *rdtgrp;
-	int ret;
-
-	if (!buf)
-		return -EINVAL;
-
-	if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL))
-		return -ENOMEM;
-	if (!zalloc_cpumask_var(&newmask, GFP_KERNEL)) {
-		free_cpumask_var(tmpmask);
-		return -ENOMEM;
-	}
-	if (!zalloc_cpumask_var(&tmpmask1, GFP_KERNEL)) {
-		free_cpumask_var(tmpmask);
-		free_cpumask_var(newmask);
-		return -ENOMEM;
-	}
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (!rdtgrp) {
-		ret = -ENOENT;
-		goto unlock;
-	}
-
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED ||
-	    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-		ret = -EINVAL;
-		rdt_last_cmd_puts("Pseudo-locking in progress\n");
-		goto unlock;
-	}
-
-	if (is_cpu_list(of))
-		ret = cpulist_parse(buf, newmask);
-	else
-		ret = cpumask_parse(buf, newmask);
-
-	if (ret) {
-		rdt_last_cmd_puts("Bad CPU list/mask\n");
-		goto unlock;
-	}
-
-	/* check that user didn't specify any offline cpus */
-	cpumask_andnot(tmpmask, newmask, cpu_online_mask);
-	if (!cpumask_empty(tmpmask)) {
-		ret = -EINVAL;
-		rdt_last_cmd_puts("Can only assign online CPUs\n");
-		goto unlock;
-	}
-
-	if (rdtgrp->type == RDTCTRL_GROUP)
-		ret = cpus_ctrl_write(rdtgrp, newmask, tmpmask, tmpmask1);
-	else if (rdtgrp->type == RDTMON_GROUP)
-		ret = cpus_mon_write(rdtgrp, newmask, tmpmask);
-	else
-		ret = -EINVAL;
-
-unlock:
-	rdtgroup_kn_unlock(of->kn);
-	free_cpumask_var(tmpmask);
-	free_cpumask_var(newmask);
-	free_cpumask_var(tmpmask1);
-
-	return ret ?: nbytes;
-}
-
-/**
- * rdtgroup_remove - the helper to remove resource group safely
- * @rdtgrp: resource group to remove
- *
- * On resource group creation via a mkdir, an extra kernfs_node reference is
- * taken to ensure that the rdtgroup structure remains accessible for the
- * rdtgroup_kn_unlock() calls where it is removed.
- *
- * Drop the extra reference here, then free the rdtgroup structure.
- *
- * Return: void
- */
-static void rdtgroup_remove(struct rdtgroup *rdtgrp)
-{
-	kernfs_put(rdtgrp->kn);
-	kfree(rdtgrp);
-}
-
-static void _update_task_closid_rmid(void *task)
-{
-	/*
-	 * If the task is still current on this CPU, update PQR_ASSOC MSR.
-	 * Otherwise, the MSR is updated when the task is scheduled in.
-	 */
-	if (task == current)
-		resctrl_arch_sched_in(task);
-}
-
-static void update_task_closid_rmid(struct task_struct *t)
-{
-	if (IS_ENABLED(CONFIG_SMP) && task_curr(t))
-		smp_call_function_single(task_cpu(t), _update_task_closid_rmid, t, 1);
-	else
-		_update_task_closid_rmid(t);
-}
-
-static bool task_in_rdtgroup(struct task_struct *tsk, struct rdtgroup *rdtgrp)
-{
-	u32 closid, rmid = rdtgrp->mon.rmid;
-
-	if (rdtgrp->type == RDTCTRL_GROUP)
-		closid = rdtgrp->closid;
-	else if (rdtgrp->type == RDTMON_GROUP)
-		closid = rdtgrp->mon.parent->closid;
-	else
-		return false;
-
-	return resctrl_arch_match_closid(tsk, closid) &&
-	       resctrl_arch_match_rmid(tsk, closid, rmid);
-}
-
-static int __rdtgroup_move_task(struct task_struct *tsk,
-				struct rdtgroup *rdtgrp)
-{
-	/* If the task is already in rdtgrp, no need to move the task. */
-	if (task_in_rdtgroup(tsk, rdtgrp))
-		return 0;
-
-	/*
-	 * Set the task's closid/rmid before the PQR_ASSOC MSR can be
-	 * updated by them.
-	 *
-	 * For ctrl_mon groups, move both closid and rmid.
-	 * For monitor groups, can move the tasks only from
-	 * their parent CTRL group.
-	 */
-	if (rdtgrp->type == RDTMON_GROUP &&
-	    !resctrl_arch_match_closid(tsk, rdtgrp->mon.parent->closid)) {
-		rdt_last_cmd_puts("Can't move task to different control group\n");
-		return -EINVAL;
-	}
-
-	if (rdtgrp->type == RDTMON_GROUP)
-		resctrl_arch_set_closid_rmid(tsk, rdtgrp->mon.parent->closid,
-					     rdtgrp->mon.rmid);
-	else
-		resctrl_arch_set_closid_rmid(tsk, rdtgrp->closid,
-					     rdtgrp->mon.rmid);
-
-	/*
-	 * Ensure the task's closid and rmid are written before determining if
-	 * the task is current that will decide if it will be interrupted.
-	 * This pairs with the full barrier between the rq->curr update and
-	 * resctrl_arch_sched_in() during context switch.
-	 */
-	smp_mb();
-
-	/*
-	 * By now, the task's closid and rmid are set. If the task is current
-	 * on a CPU, the PQR_ASSOC MSR needs to be updated to make the resource
-	 * group go into effect. If the task is not current, the MSR will be
-	 * updated when the task is scheduled in.
-	 */
-	update_task_closid_rmid(tsk);
-
-	return 0;
-}
-
-static bool is_closid_match(struct task_struct *t, struct rdtgroup *r)
-{
-	return (resctrl_arch_alloc_capable() && (r->type == RDTCTRL_GROUP) &&
-		resctrl_arch_match_closid(t, r->closid));
-}
-
-static bool is_rmid_match(struct task_struct *t, struct rdtgroup *r)
-{
-	return (resctrl_arch_mon_capable() && (r->type == RDTMON_GROUP) &&
-		resctrl_arch_match_rmid(t, r->mon.parent->closid,
-					r->mon.rmid));
-}
-
-/**
- * rdtgroup_tasks_assigned - Test if tasks have been assigned to resource group
- * @r: Resource group
- *
- * Return: 1 if tasks have been assigned to @r, 0 otherwise
- */
-int rdtgroup_tasks_assigned(struct rdtgroup *r)
-{
-	struct task_struct *p, *t;
-	int ret = 0;
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	rcu_read_lock();
-	for_each_process_thread(p, t) {
-		if (is_closid_match(t, r) || is_rmid_match(t, r)) {
-			ret = 1;
-			break;
-		}
-	}
-	rcu_read_unlock();
-
-	return ret;
-}
-
-static int rdtgroup_task_write_permission(struct task_struct *task,
-					  struct kernfs_open_file *of)
-{
-	const struct cred *tcred = get_task_cred(task);
-	const struct cred *cred = current_cred();
-	int ret = 0;
-
-	/*
-	 * Even if we're attaching all tasks in the thread group, we only
-	 * need to check permissions on one of them.
-	 */
-	if (!uid_eq(cred->euid, GLOBAL_ROOT_UID) &&
-	    !uid_eq(cred->euid, tcred->uid) &&
-	    !uid_eq(cred->euid, tcred->suid)) {
-		rdt_last_cmd_printf("No permission to move task %d\n", task->pid);
-		ret = -EPERM;
-	}
-
-	put_cred(tcred);
-	return ret;
-}
-
-static int rdtgroup_move_task(pid_t pid, struct rdtgroup *rdtgrp,
-			      struct kernfs_open_file *of)
-{
-	struct task_struct *tsk;
-	int ret;
-
-	rcu_read_lock();
-	if (pid) {
-		tsk = find_task_by_vpid(pid);
-		if (!tsk) {
-			rcu_read_unlock();
-			rdt_last_cmd_printf("No task %d\n", pid);
-			return -ESRCH;
-		}
-	} else {
-		tsk = current;
-	}
-
-	get_task_struct(tsk);
-	rcu_read_unlock();
-
-	ret = rdtgroup_task_write_permission(tsk, of);
-	if (!ret)
-		ret = __rdtgroup_move_task(tsk, rdtgrp);
-
-	put_task_struct(tsk);
-	return ret;
-}
-
-static ssize_t rdtgroup_tasks_write(struct kernfs_open_file *of,
-				    char *buf, size_t nbytes, loff_t off)
-{
-	struct rdtgroup *rdtgrp;
-	char *pid_str;
-	int ret = 0;
-	pid_t pid;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (!rdtgrp) {
-		rdtgroup_kn_unlock(of->kn);
-		return -ENOENT;
-	}
-	rdt_last_cmd_clear();
-
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED ||
-	    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-		ret = -EINVAL;
-		rdt_last_cmd_puts("Pseudo-locking in progress\n");
-		goto unlock;
-	}
-
-	while (buf && buf[0] != '\0' && buf[0] != '\n') {
-		pid_str = strim(strsep(&buf, ","));
-
-		if (kstrtoint(pid_str, 0, &pid)) {
-			rdt_last_cmd_printf("Task list parsing error pid %s\n", pid_str);
-			ret = -EINVAL;
-			break;
-		}
-
-		if (pid < 0) {
-			rdt_last_cmd_printf("Invalid pid %d\n", pid);
-			ret = -EINVAL;
-			break;
-		}
-
-		ret = rdtgroup_move_task(pid, rdtgrp, of);
-		if (ret) {
-			rdt_last_cmd_printf("Error while processing task %d\n", pid);
-			break;
-		}
-	}
-
-unlock:
-	rdtgroup_kn_unlock(of->kn);
-
-	return ret ?: nbytes;
-}
-
-static void show_rdt_tasks(struct rdtgroup *r, struct seq_file *s)
-{
-	struct task_struct *p, *t;
-	pid_t pid;
-
-	rcu_read_lock();
-	for_each_process_thread(p, t) {
-		if (is_closid_match(t, r) || is_rmid_match(t, r)) {
-			pid = task_pid_vnr(t);
-			if (pid)
-				seq_printf(s, "%d\n", pid);
-		}
-	}
-	rcu_read_unlock();
-}
-
-static int rdtgroup_tasks_show(struct kernfs_open_file *of,
-			       struct seq_file *s, void *v)
-{
-	struct rdtgroup *rdtgrp;
-	int ret = 0;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (rdtgrp)
-		show_rdt_tasks(rdtgrp, s);
-	else
-		ret = -ENOENT;
-	rdtgroup_kn_unlock(of->kn);
-
-	return ret;
-}
-
-static int rdtgroup_closid_show(struct kernfs_open_file *of,
-				struct seq_file *s, void *v)
-{
-	struct rdtgroup *rdtgrp;
-	int ret = 0;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (rdtgrp)
-		seq_printf(s, "%u\n", rdtgrp->closid);
-	else
-		ret = -ENOENT;
-	rdtgroup_kn_unlock(of->kn);
-
-	return ret;
-}
-
-static int rdtgroup_rmid_show(struct kernfs_open_file *of,
-			      struct seq_file *s, void *v)
-{
-	struct rdtgroup *rdtgrp;
-	int ret = 0;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (rdtgrp)
-		seq_printf(s, "%u\n", rdtgrp->mon.rmid);
-	else
-		ret = -ENOENT;
-	rdtgroup_kn_unlock(of->kn);
-
-	return ret;
-}
-
-#ifdef CONFIG_PROC_CPU_RESCTRL
-
-/*
- * A task can only be part of one resctrl control group and of one monitor
- * group which is associated to that control group.
- *
- * 1)   res:
- *      mon:
- *
- *    resctrl is not available.
- *
- * 2)   res:/
- *      mon:
- *
- *    Task is part of the root resctrl control group, and it is not associated
- *    to any monitor group.
- *
- * 3)  res:/
- *     mon:mon0
- *
- *    Task is part of the root resctrl control group and monitor group mon0.
- *
- * 4)  res:group0
- *     mon:
- *
- *    Task is part of resctrl control group group0, and it is not associated
- *    to any monitor group.
- *
- * 5) res:group0
- *    mon:mon1
- *
- *    Task is part of resctrl control group group0 and monitor group mon1.
- */
-int proc_resctrl_show(struct seq_file *s, struct pid_namespace *ns,
-		      struct pid *pid, struct task_struct *tsk)
-{
-	struct rdtgroup *rdtg;
-	int ret = 0;
-
-	mutex_lock(&rdtgroup_mutex);
-
-	/* Return empty if resctrl has not been mounted. */
-	if (!resctrl_mounted) {
-		seq_puts(s, "res:\nmon:\n");
-		goto unlock;
-	}
-
-	list_for_each_entry(rdtg, &rdt_all_groups, rdtgroup_list) {
-		struct rdtgroup *crg;
-
-		/*
-		 * Task information is only relevant for shareable
-		 * and exclusive groups.
-		 */
-		if (rdtg->mode != RDT_MODE_SHAREABLE &&
-		    rdtg->mode != RDT_MODE_EXCLUSIVE)
-			continue;
-
-		if (!resctrl_arch_match_closid(tsk, rdtg->closid))
-			continue;
-
-		seq_printf(s, "res:%s%s\n", (rdtg == &rdtgroup_default) ? "/" : "",
-			   rdtg->kn->name);
-		seq_puts(s, "mon:");
-		list_for_each_entry(crg, &rdtg->mon.crdtgrp_list,
-				    mon.crdtgrp_list) {
-			if (!resctrl_arch_match_rmid(tsk, crg->mon.parent->closid,
-						     crg->mon.rmid))
-				continue;
-			seq_printf(s, "%s", crg->kn->name);
-			break;
-		}
-		seq_putc(s, '\n');
-		goto unlock;
-	}
-	/*
-	 * The above search should succeed. Otherwise return
-	 * with an error.
-	 */
-	ret = -ENOENT;
-unlock:
-	mutex_unlock(&rdtgroup_mutex);
-
-	return ret;
-}
-#endif
-
-static int rdt_last_cmd_status_show(struct kernfs_open_file *of,
-				    struct seq_file *seq, void *v)
-{
-	int len;
-
-	mutex_lock(&rdtgroup_mutex);
-	len = seq_buf_used(&last_cmd_status);
-	if (len)
-		seq_printf(seq, "%.*s", len, last_cmd_status_buf);
-	else
-		seq_puts(seq, "ok\n");
-	mutex_unlock(&rdtgroup_mutex);
-	return 0;
-}
-
-static int rdt_num_closids_show(struct kernfs_open_file *of,
-				struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = of->kn->parent->priv;
-
-	seq_printf(seq, "%u\n", s->num_closid);
-	return 0;
-}
-
-static int rdt_default_ctrl_show(struct kernfs_open_file *of,
-			     struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = of->kn->parent->priv;
-	struct rdt_resource *r = s->res;
-
-	seq_printf(seq, "%x\n", r->default_ctrl);
-	return 0;
-}
-
-static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
-			     struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = of->kn->parent->priv;
-	struct rdt_resource *r = s->res;
-
-	seq_printf(seq, "%u\n", r->cache.min_cbm_bits);
-	return 0;
-}
-
-static int rdt_shareable_bits_show(struct kernfs_open_file *of,
-				   struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = of->kn->parent->priv;
-	struct rdt_resource *r = s->res;
-
-	seq_printf(seq, "%x\n", r->cache.shareable_bits);
-	return 0;
-}
-
-/*
- * rdt_bit_usage_show - Display current usage of resources
- *
- * A domain is a shared resource that can now be allocated differently. Here
- * we display the current regions of the domain as an annotated bitmask.
- * For each domain of this resource its allocation bitmask
- * is annotated as below to indicate the current usage of the corresponding bit:
- *   0 - currently unused
- *   X - currently available for sharing and used by software and hardware
- *   H - currently used by hardware only but available for software use
- *   S - currently used and shareable by software only
- *   E - currently used exclusively by one resource group
- *   P - currently pseudo-locked by one resource group
- */
-static int rdt_bit_usage_show(struct kernfs_open_file *of,
-			      struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = of->kn->parent->priv;
-	/*
-	 * Use unsigned long even though only 32 bits are used to ensure
-	 * test_bit() is used safely.
-	 */
-	unsigned long sw_shareable = 0, hw_shareable = 0;
-	unsigned long exclusive = 0, pseudo_locked = 0;
-	struct rdt_resource *r = s->res;
-	struct rdt_domain *dom;
-	int i, hwb, swb, excl, psl;
-	enum rdtgrp_mode mode;
-	bool sep = false;
-	u32 ctrl_val;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-	hw_shareable = r->cache.shareable_bits;
-	list_for_each_entry(dom, &r->domains, list) {
-		if (sep)
-			seq_putc(seq, ';');
-		sw_shareable = 0;
-		exclusive = 0;
-		seq_printf(seq, "%d=", dom->id);
-		for (i = 0; i < closids_supported(); i++) {
-			if (!closid_allocated(i))
-				continue;
-			ctrl_val = resctrl_arch_get_config(r, dom, i,
-							   s->conf_type);
-			mode = rdtgroup_mode_by_closid(i);
-			switch (mode) {
-			case RDT_MODE_SHAREABLE:
-				sw_shareable |= ctrl_val;
-				break;
-			case RDT_MODE_EXCLUSIVE:
-				exclusive |= ctrl_val;
-				break;
-			case RDT_MODE_PSEUDO_LOCKSETUP:
-			/*
-			 * RDT_MODE_PSEUDO_LOCKSETUP is possible
-			 * here but not included since the CBM
-			 * associated with this CLOSID in this mode
-			 * is not initialized and no task or cpu can be
-			 * assigned this CLOSID.
-			 */
-				break;
-			case RDT_MODE_PSEUDO_LOCKED:
-			case RDT_NUM_MODES:
-				WARN(1,
-				     "invalid mode for closid %d\n", i);
-				break;
-			}
-		}
-		for (i = r->cache.cbm_len - 1; i >= 0; i--) {
-			pseudo_locked = dom->plr ? dom->plr->cbm : 0;
-			hwb = test_bit(i, &hw_shareable);
-			swb = test_bit(i, &sw_shareable);
-			excl = test_bit(i, &exclusive);
-			psl = test_bit(i, &pseudo_locked);
-			if (hwb && swb)
-				seq_putc(seq, 'X');
-			else if (hwb && !swb)
-				seq_putc(seq, 'H');
-			else if (!hwb && swb)
-				seq_putc(seq, 'S');
-			else if (excl)
-				seq_putc(seq, 'E');
-			else if (psl)
-				seq_putc(seq, 'P');
-			else /* Unused bits remain */
-				seq_putc(seq, '0');
-		}
-		sep = true;
-	}
-	seq_putc(seq, '\n');
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-	return 0;
-}
-
-static int rdt_min_bw_show(struct kernfs_open_file *of,
-			     struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = of->kn->parent->priv;
-	struct rdt_resource *r = s->res;
-
-	seq_printf(seq, "%u\n", r->membw.min_bw);
-	return 0;
-}
-
-static int rdt_num_rmids_show(struct kernfs_open_file *of,
-			      struct seq_file *seq, void *v)
-{
-	struct rdt_resource *r = of->kn->parent->priv;
-
-	seq_printf(seq, "%d\n", r->num_rmid);
-
-	return 0;
-}
-
-static int rdt_mon_features_show(struct kernfs_open_file *of,
-				 struct seq_file *seq, void *v)
-{
-	struct rdt_resource *r = of->kn->parent->priv;
-	struct mon_evt *mevt;
-
-	list_for_each_entry(mevt, &r->evt_list, list) {
-		seq_printf(seq, "%s\n", mevt->name);
-		if (mevt->configurable)
-			seq_printf(seq, "%s_config\n", mevt->name);
-	}
-
-	return 0;
-}
-
-static int rdt_bw_gran_show(struct kernfs_open_file *of,
-			     struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = of->kn->parent->priv;
-	struct rdt_resource *r = s->res;
-
-	seq_printf(seq, "%u\n", r->membw.bw_gran);
-	return 0;
-}
-
-static int rdt_delay_linear_show(struct kernfs_open_file *of,
-			     struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = of->kn->parent->priv;
-	struct rdt_resource *r = s->res;
-
-	seq_printf(seq, "%u\n", r->membw.delay_linear);
-	return 0;
-}
-
-static int max_threshold_occ_show(struct kernfs_open_file *of,
-				  struct seq_file *seq, void *v)
-{
-	seq_printf(seq, "%u\n", resctrl_rmid_realloc_threshold);
-
-	return 0;
-}
-
-static int rdt_thread_throttle_mode_show(struct kernfs_open_file *of,
-					 struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = of->kn->parent->priv;
-	struct rdt_resource *r = s->res;
-
-	if (r->membw.throttle_mode == THREAD_THROTTLE_PER_THREAD)
-		seq_puts(seq, "per-thread\n");
-	else
-		seq_puts(seq, "max\n");
-
-	return 0;
-}
-
-static ssize_t max_threshold_occ_write(struct kernfs_open_file *of,
-				       char *buf, size_t nbytes, loff_t off)
-{
-	unsigned int bytes;
-	int ret;
-
-	ret = kstrtouint(buf, 0, &bytes);
-	if (ret)
-		return ret;
-
-	if (bytes > resctrl_rmid_realloc_limit)
-		return -EINVAL;
-
-	resctrl_rmid_realloc_threshold = resctrl_arch_round_mon_val(bytes);
-
-	return nbytes;
-}
-
-/*
- * rdtgroup_mode_show - Display mode of this resource group
- */
-static int rdtgroup_mode_show(struct kernfs_open_file *of,
-			      struct seq_file *s, void *v)
-{
-	struct rdtgroup *rdtgrp;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (!rdtgrp) {
-		rdtgroup_kn_unlock(of->kn);
-		return -ENOENT;
-	}
-
-	seq_printf(s, "%s\n", rdtgroup_mode_str(rdtgrp->mode));
-
-	rdtgroup_kn_unlock(of->kn);
-	return 0;
-}
-
-static enum resctrl_conf_type resctrl_peer_type(enum resctrl_conf_type my_type)
-{
-	switch (my_type) {
-	case CDP_CODE:
-		return CDP_DATA;
-	case CDP_DATA:
-		return CDP_CODE;
-	default:
-	case CDP_NONE:
-		return CDP_NONE;
-	}
-}
-
-static int rdt_has_sparse_bitmasks_show(struct kernfs_open_file *of,
-					struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = of->kn->parent->priv;
-	struct rdt_resource *r = s->res;
-
-	seq_printf(seq, "%u\n", r->cache.arch_has_sparse_bitmasks);
-
-	return 0;
-}
-
-/**
- * __rdtgroup_cbm_overlaps - Does CBM for intended closid overlap with other
- * @r: Resource to which domain instance @d belongs.
- * @d: The domain instance for which @closid is being tested.
- * @cbm: Capacity bitmask being tested.
- * @closid: Intended closid for @cbm.
- * @type: CDP type of @r.
- * @exclusive: Only check if overlaps with exclusive resource groups
- *
- * Checks if provided @cbm intended to be used for @closid on domain
- * @d overlaps with any other closids or other hardware usage associated
- * with this domain. If @exclusive is true then only overlaps with
- * resource groups in exclusive mode will be considered. If @exclusive
- * is false then overlaps with any resource group or hardware entities
- * will be considered.
- *
- * @cbm is unsigned long, even if only 32 bits are used, to make the
- * bitmap functions work correctly.
- *
- * Return: false if CBM does not overlap, true if it does.
- */
-static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d,
-				    unsigned long cbm, int closid,
-				    enum resctrl_conf_type type, bool exclusive)
-{
-	enum rdtgrp_mode mode;
-	unsigned long ctrl_b;
-	int i;
-
-	/* Check for any overlap with regions used by hardware directly */
-	if (!exclusive) {
-		ctrl_b = r->cache.shareable_bits;
-		if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len))
-			return true;
-	}
-
-	/* Check for overlap with other resource groups */
-	for (i = 0; i < closids_supported(); i++) {
-		ctrl_b = resctrl_arch_get_config(r, d, i, type);
-		mode = rdtgroup_mode_by_closid(i);
-		if (closid_allocated(i) && i != closid &&
-		    mode != RDT_MODE_PSEUDO_LOCKSETUP) {
-			if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len)) {
-				if (exclusive) {
-					if (mode == RDT_MODE_EXCLUSIVE)
-						return true;
-					continue;
-				}
-				return true;
-			}
-		}
-	}
-
-	return false;
-}
-
-/**
- * rdtgroup_cbm_overlaps - Does CBM overlap with other use of hardware
- * @s: Schema for the resource to which domain instance @d belongs.
- * @d: The domain instance for which @closid is being tested.
- * @cbm: Capacity bitmask being tested.
- * @closid: Intended closid for @cbm.
- * @exclusive: Only check if overlaps with exclusive resource groups
- *
- * Resources that can be allocated using a CBM can use the CBM to control
- * the overlap of these allocations. rdtgroup_cmb_overlaps() is the test
- * for overlap. Overlap test is not limited to the specific resource for
- * which the CBM is intended though - when dealing with CDP resources that
- * share the underlying hardware the overlap check should be performed on
- * the CDP resource sharing the hardware also.
- *
- * Refer to description of __rdtgroup_cbm_overlaps() for the details of the
- * overlap test.
- *
- * Return: true if CBM overlap detected, false if there is no overlap
- */
-bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
-			   unsigned long cbm, int closid, bool exclusive)
-{
-	enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
-	struct rdt_resource *r = s->res;
-
-	if (__rdtgroup_cbm_overlaps(r, d, cbm, closid, s->conf_type,
-				    exclusive))
-		return true;
-
-	if (!resctrl_arch_get_cdp_enabled(r->rid))
-		return false;
-	return  __rdtgroup_cbm_overlaps(r, d, cbm, closid, peer_type, exclusive);
-}
-
-/**
- * rdtgroup_mode_test_exclusive - Test if this resource group can be exclusive
- * @rdtgrp: Resource group identified through its closid.
- *
- * An exclusive resource group implies that there should be no sharing of
- * its allocated resources. At the time this group is considered to be
- * exclusive this test can determine if its current schemata supports this
- * setting by testing for overlap with all other resource groups.
- *
- * Return: true if resource group can be exclusive, false if there is overlap
- * with allocations of other resource groups and thus this resource group
- * cannot be exclusive.
- */
-static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
-{
-	int closid = rdtgrp->closid;
-	struct resctrl_schema *s;
-	struct rdt_resource *r;
-	bool has_cache = false;
-	struct rdt_domain *d;
-	u32 ctrl;
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	list_for_each_entry(s, &resctrl_schema_all, list) {
-		r = s->res;
-		if (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)
-			continue;
-		has_cache = true;
-		list_for_each_entry(d, &r->domains, list) {
-			ctrl = resctrl_arch_get_config(r, d, closid,
-						       s->conf_type);
-			if (rdtgroup_cbm_overlaps(s, d, ctrl, closid, false)) {
-				rdt_last_cmd_puts("Schemata overlaps\n");
-				return false;
-			}
-		}
-	}
-
-	if (!has_cache) {
-		rdt_last_cmd_puts("Cannot be exclusive without CAT/CDP\n");
-		return false;
-	}
-
-	return true;
-}
-
-/*
- * rdtgroup_mode_write - Modify the resource group's mode
- */
-static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
-				   char *buf, size_t nbytes, loff_t off)
-{
-	struct rdtgroup *rdtgrp;
-	enum rdtgrp_mode mode;
-	int ret = 0;
-
-	/* Valid input requires a trailing newline */
-	if (nbytes == 0 || buf[nbytes - 1] != '\n')
-		return -EINVAL;
-	buf[nbytes - 1] = '\0';
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (!rdtgrp) {
-		rdtgroup_kn_unlock(of->kn);
-		return -ENOENT;
-	}
-
-	rdt_last_cmd_clear();
-
-	mode = rdtgrp->mode;
-
-	if ((!strcmp(buf, "shareable") && mode == RDT_MODE_SHAREABLE) ||
-	    (!strcmp(buf, "exclusive") && mode == RDT_MODE_EXCLUSIVE) ||
-	    (!strcmp(buf, "pseudo-locksetup") &&
-	     mode == RDT_MODE_PSEUDO_LOCKSETUP) ||
-	    (!strcmp(buf, "pseudo-locked") && mode == RDT_MODE_PSEUDO_LOCKED))
-		goto out;
-
-	if (mode == RDT_MODE_PSEUDO_LOCKED) {
-		rdt_last_cmd_puts("Cannot change pseudo-locked group\n");
-		ret = -EINVAL;
-		goto out;
-	}
-
-	if (!strcmp(buf, "shareable")) {
-		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-			ret = rdtgroup_locksetup_exit(rdtgrp);
-			if (ret)
-				goto out;
-		}
-		rdtgrp->mode = RDT_MODE_SHAREABLE;
-	} else if (!strcmp(buf, "exclusive")) {
-		if (!rdtgroup_mode_test_exclusive(rdtgrp)) {
-			ret = -EINVAL;
-			goto out;
-		}
-		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-			ret = rdtgroup_locksetup_exit(rdtgrp);
-			if (ret)
-				goto out;
-		}
-		rdtgrp->mode = RDT_MODE_EXCLUSIVE;
-	} else if (IS_ENABLED(CONFIG_RESCTRL_FS_PSEUDO_LOCK) &&
-		   !strcmp(buf, "pseudo-locksetup")) {
-		ret = rdtgroup_locksetup_enter(rdtgrp);
-		if (ret)
-			goto out;
-		rdtgrp->mode = RDT_MODE_PSEUDO_LOCKSETUP;
-	} else {
-		rdt_last_cmd_puts("Unknown or unsupported mode\n");
-		ret = -EINVAL;
-	}
-
-out:
-	rdtgroup_kn_unlock(of->kn);
-	return ret ?: nbytes;
-}
-
-/**
- * rdtgroup_cbm_to_size - Translate CBM to size in bytes
- * @r: RDT resource to which @d belongs.
- * @d: RDT domain instance.
- * @cbm: bitmask for which the size should be computed.
- *
- * The bitmask provided associated with the RDT domain instance @d will be
- * translated into how many bytes it represents. The size in bytes is
- * computed by first dividing the total cache size by the CBM length to
- * determine how many bytes each bit in the bitmask represents. The result
- * is multiplied with the number of bits set in the bitmask.
- *
- * @cbm is unsigned long, even if only 32 bits are used to make the
- * bitmap functions work correctly.
- */
-unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
-				  struct rdt_domain *d, unsigned long cbm)
-{
-	struct cpu_cacheinfo *ci;
-	unsigned int size = 0;
-	int num_b, i;
-
-	num_b = bitmap_weight(&cbm, r->cache.cbm_len);
-	ci = get_cpu_cacheinfo(cpumask_any(&d->cpu_mask));
-	for (i = 0; i < ci->num_leaves; i++) {
-		if (ci->info_list[i].level == r->cache_level) {
-			size = ci->info_list[i].size / r->cache.cbm_len * num_b;
-			break;
-		}
-	}
-
-	return size;
-}
-
-/*
- * rdtgroup_size_show - Display size in bytes of allocated regions
- *
- * The "size" file mirrors the layout of the "schemata" file, printing the
- * size in bytes of each region instead of the capacity bitmask.
- */
-static int rdtgroup_size_show(struct kernfs_open_file *of,
-			      struct seq_file *s, void *v)
-{
-	struct resctrl_schema *schema;
-	enum resctrl_conf_type type;
-	struct rdtgroup *rdtgrp;
-	struct rdt_resource *r;
-	struct rdt_domain *d;
-	unsigned int size;
-	int ret = 0;
-	u32 closid;
-	bool sep;
-	u32 ctrl;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (!rdtgrp) {
-		rdtgroup_kn_unlock(of->kn);
-		return -ENOENT;
-	}
-
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
-		if (!rdtgrp->plr->d) {
-			rdt_last_cmd_clear();
-			rdt_last_cmd_puts("Cache domain offline\n");
-			ret = -ENODEV;
-		} else {
-			seq_printf(s, "%*s:", max_name_width,
-				   rdtgrp->plr->s->name);
-			size = rdtgroup_cbm_to_size(rdtgrp->plr->s->res,
-						    rdtgrp->plr->d,
-						    rdtgrp->plr->cbm);
-			seq_printf(s, "%d=%u\n", rdtgrp->plr->d->id, size);
-		}
-		goto out;
-	}
-
-	closid = rdtgrp->closid;
-
-	list_for_each_entry(schema, &resctrl_schema_all, list) {
-		r = schema->res;
-		type = schema->conf_type;
-		sep = false;
-		seq_printf(s, "%*s:", max_name_width, schema->name);
-		list_for_each_entry(d, &r->domains, list) {
-			if (sep)
-				seq_putc(s, ';');
-			if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-				size = 0;
-			} else {
-				if (is_mba_sc(r))
-					ctrl = d->mbps_val[closid];
-				else
-					ctrl = resctrl_arch_get_config(r, d,
-								       closid,
-								       type);
-				if (r->rid == RDT_RESOURCE_MBA ||
-				    r->rid == RDT_RESOURCE_SMBA)
-					size = ctrl;
-				else
-					size = rdtgroup_cbm_to_size(r, d, ctrl);
-			}
-			seq_printf(s, "%d=%u", d->id, size);
-			sep = true;
-		}
-		seq_putc(s, '\n');
-	}
-
-out:
-	rdtgroup_kn_unlock(of->kn);
-
-	return ret;
-}
-
-static void mondata_config_read(struct resctrl_mon_config_info *mon_info)
-{
-	smp_call_function_any(&mon_info->d->cpu_mask,
-			      resctrl_arch_mon_event_config_read, mon_info, 1);
-}
-
-static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid)
-{
-	struct resctrl_mon_config_info mon_info = {0};
-	struct rdt_domain *dom;
-	bool sep = false;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	list_for_each_entry(dom, &r->domains, list) {
-		if (sep)
-			seq_puts(s, ";");
-
-		memset(&mon_info, 0, sizeof(struct resctrl_mon_config_info));
-		mon_info.r = r;
-		mon_info.d = dom;
-		mon_info.evtid = evtid;
-		mondata_config_read(&mon_info);
-
-		seq_printf(s, "%d=0x%02x", dom->id, mon_info.mon_config);
-		sep = true;
-	}
-	seq_puts(s, "\n");
-
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-
-	return 0;
-}
-
-static int mbm_total_bytes_config_show(struct kernfs_open_file *of,
-				       struct seq_file *seq, void *v)
-{
-	struct rdt_resource *r = of->kn->parent->priv;
-
-	mbm_config_show(seq, r, QOS_L3_MBM_TOTAL_EVENT_ID);
-
-	return 0;
-}
-
-static int mbm_local_bytes_config_show(struct kernfs_open_file *of,
-				       struct seq_file *seq, void *v)
-{
-	struct rdt_resource *r = of->kn->parent->priv;
-
-	mbm_config_show(seq, r, QOS_L3_MBM_LOCAL_EVENT_ID);
-
-	return 0;
-}
-
-static int mbm_config_write_domain(struct rdt_resource *r,
-				   struct rdt_domain *d, u32 evtid, u32 val)
-{
-	struct resctrl_mon_config_info mon_info = {0};
-
-	/*
-	 * Read the current config value first. If both are the same then
-	 * no need to write it again.
-	 */
-	mon_info.r = r;
-	mon_info.d = d;
-	mon_info.evtid = evtid;
-	mondata_config_read(&mon_info);
-	if (mon_info.mon_config == val)
-		return 0;
-
-	mon_info.mon_config = val;
-
-	/*
-	 * Update MSR_IA32_EVT_CFG_BASE MSR on one of the CPUs in the
-	 * domain. The MSRs offset from MSR MSR_IA32_EVT_CFG_BASE
-	 * are scoped at the domain level. Writing any of these MSRs
-	 * on one CPU is observed by all the CPUs in the domain.
-	 */
-	smp_call_function_any(&d->cpu_mask, resctrl_arch_mon_event_config_write,
-			      &mon_info, 1);
-	if (mon_info.err) {
-		rdt_last_cmd_puts("Invalid event configuration\n");
-		return mon_info.err;
-	}
-
-	/*
-	 * When an Event Configuration is changed, the bandwidth counters
-	 * for all RMIDs and Events will be cleared by the hardware. The
-	 * hardware also sets MSR_IA32_QM_CTR.Unavailable (bit 62) for
-	 * every RMID on the next read to any event for every RMID.
-	 * Subsequent reads will have MSR_IA32_QM_CTR.Unavailable (bit 62)
-	 * cleared while it is tracked by the hardware. Clear the
-	 * mbm_local and mbm_total counts for all the RMIDs.
-	 */
-	resctrl_arch_reset_rmid_all(r, d);
-
-	return 0;
-}
-
-static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
-{
-	char *dom_str = NULL, *id_str;
-	unsigned long dom_id, val;
-	struct rdt_domain *d;
-	int err;
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-next:
-	if (!tok || tok[0] == '\0')
-		return 0;
-
-	/* Start processing the strings for each domain */
-	dom_str = strim(strsep(&tok, ";"));
-	id_str = strsep(&dom_str, "=");
-
-	if (!id_str || kstrtoul(id_str, 10, &dom_id)) {
-		rdt_last_cmd_puts("Missing '=' or non-numeric domain id\n");
-		return -EINVAL;
-	}
-
-	if (!dom_str || kstrtoul(dom_str, 16, &val)) {
-		rdt_last_cmd_puts("Non-numeric event configuration value\n");
-		return -EINVAL;
-	}
-
-	/* Value from user cannot be more than the supported set of events */
-	if ((val & r->mbm_cfg_mask) != val) {
-		rdt_last_cmd_printf("Invalid event configuration: max valid mask is 0x%02x\n",
-				    r->mbm_cfg_mask);
-		return -EINVAL;
-	}
-
-	list_for_each_entry(d, &r->domains, list) {
-		if (d->id == dom_id) {
-			err = mbm_config_write_domain(r, d, evtid, val);
-			if (err)
-				return err;
-			goto next;
-		}
-	}
-
-	return -EINVAL;
-}
-
-static ssize_t mbm_total_bytes_config_write(struct kernfs_open_file *of,
-					    char *buf, size_t nbytes,
-					    loff_t off)
-{
-	struct rdt_resource *r = of->kn->parent->priv;
-	int ret;
-
-	/* Valid input requires a trailing newline */
-	if (nbytes == 0 || buf[nbytes - 1] != '\n')
-		return -EINVAL;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	rdt_last_cmd_clear();
-
-	buf[nbytes - 1] = '\0';
-
-	ret = mon_config_write(r, buf, QOS_L3_MBM_TOTAL_EVENT_ID);
-
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-
-	return ret ?: nbytes;
-}
-
-static ssize_t mbm_local_bytes_config_write(struct kernfs_open_file *of,
-					    char *buf, size_t nbytes,
-					    loff_t off)
-{
-	struct rdt_resource *r = of->kn->parent->priv;
-	int ret;
-
-	/* Valid input requires a trailing newline */
-	if (nbytes == 0 || buf[nbytes - 1] != '\n')
-		return -EINVAL;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	rdt_last_cmd_clear();
-
-	buf[nbytes - 1] = '\0';
-
-	ret = mon_config_write(r, buf, QOS_L3_MBM_LOCAL_EVENT_ID);
-
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-
-	return ret ?: nbytes;
-}
-
-/* rdtgroup information files for one cache resource. */
-static struct rftype res_common_files[] = {
-	{
-		.name		= "last_cmd_status",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_last_cmd_status_show,
-		.fflags		= RFTYPE_TOP_INFO,
-	},
-	{
-		.name		= "num_closids",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_num_closids_show,
-		.fflags		= RFTYPE_CTRL_INFO,
-	},
-	{
-		.name		= "mon_features",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_mon_features_show,
-		.fflags		= RFTYPE_MON_INFO,
-	},
-	{
-		.name		= "num_rmids",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_num_rmids_show,
-		.fflags		= RFTYPE_MON_INFO,
-	},
-	{
-		.name		= "cbm_mask",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_default_ctrl_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
-	},
-	{
-		.name		= "min_cbm_bits",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_min_cbm_bits_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
-	},
-	{
-		.name		= "shareable_bits",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_shareable_bits_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
-	},
-	{
-		.name		= "bit_usage",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_bit_usage_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
-	},
-	{
-		.name		= "min_bandwidth",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_min_bw_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
-	},
-	{
-		.name		= "bandwidth_gran",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_bw_gran_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
-	},
-	{
-		.name		= "delay_linear",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_delay_linear_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
-	},
-	/*
-	 * Platform specific which (if any) capabilities are provided by
-	 * thread_throttle_mode. Defer "fflags" initialization to platform
-	 * discovery.
-	 */
-	{
-		.name		= "thread_throttle_mode",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_thread_throttle_mode_show,
-	},
-	{
-		.name		= "max_threshold_occupancy",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.write		= max_threshold_occ_write,
-		.seq_show	= max_threshold_occ_show,
-		.fflags		= RFTYPE_MON_INFO | RFTYPE_RES_CACHE,
-	},
-	{
-		.name		= "mbm_total_bytes_config",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= mbm_total_bytes_config_show,
-		.write		= mbm_total_bytes_config_write,
-	},
-	{
-		.name		= "mbm_local_bytes_config",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= mbm_local_bytes_config_show,
-		.write		= mbm_local_bytes_config_write,
-	},
-	{
-		.name		= "cpus",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.write		= rdtgroup_cpus_write,
-		.seq_show	= rdtgroup_cpus_show,
-		.fflags		= RFTYPE_BASE,
-	},
-	{
-		.name		= "cpus_list",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.write		= rdtgroup_cpus_write,
-		.seq_show	= rdtgroup_cpus_show,
-		.flags		= RFTYPE_FLAGS_CPUS_LIST,
-		.fflags		= RFTYPE_BASE,
-	},
-	{
-		.name		= "tasks",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.write		= rdtgroup_tasks_write,
-		.seq_show	= rdtgroup_tasks_show,
-		.fflags		= RFTYPE_BASE,
-	},
-	{
-		.name		= "mon_hw_id",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdtgroup_rmid_show,
-		.fflags		= RFTYPE_MON_BASE | RFTYPE_DEBUG,
-	},
-	{
-		.name		= "schemata",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.write		= rdtgroup_schemata_write,
-		.seq_show	= rdtgroup_schemata_show,
-		.fflags		= RFTYPE_CTRL_BASE,
-	},
-	{
-		.name		= "mode",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.write		= rdtgroup_mode_write,
-		.seq_show	= rdtgroup_mode_show,
-		.fflags		= RFTYPE_CTRL_BASE,
-	},
-	{
-		.name		= "size",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdtgroup_size_show,
-		.fflags		= RFTYPE_CTRL_BASE,
-	},
-	{
-		.name		= "sparse_masks",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_has_sparse_bitmasks_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
-	},
-	{
-		.name		= "ctrl_hw_id",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdtgroup_closid_show,
-		.fflags		= RFTYPE_CTRL_BASE | RFTYPE_DEBUG,
-	},
-
-};
-
-static int rdtgroup_add_files(struct kernfs_node *kn, unsigned long fflags)
-{
-	struct rftype *rfts, *rft;
-	int ret, len;
-
-	rfts = res_common_files;
-	len = ARRAY_SIZE(res_common_files);
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	if (resctrl_debug)
-		fflags |= RFTYPE_DEBUG;
-
-	for (rft = rfts; rft < rfts + len; rft++) {
-		if (rft->fflags && ((fflags & rft->fflags) == rft->fflags)) {
-			ret = rdtgroup_add_file(kn, rft);
-			if (ret)
-				goto error;
-		}
-	}
-
-	return 0;
-error:
-	pr_warn("Failed to add %s, err=%d\n", rft->name, ret);
-	while (--rft >= rfts) {
-		if ((fflags & rft->fflags) == rft->fflags)
-			kernfs_remove_by_name(kn, rft->name);
-	}
-	return ret;
-}
-
-static struct rftype *rdtgroup_get_rftype_by_name(const char *name)
-{
-	struct rftype *rfts, *rft;
-	int len;
-
-	rfts = res_common_files;
-	len = ARRAY_SIZE(res_common_files);
-
-	for (rft = rfts; rft < rfts + len; rft++) {
-		if (!strcmp(rft->name, name))
-			return rft;
-	}
-
-	return NULL;
-}
-
-static void thread_throttle_mode_init(void)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-	struct rftype *rft;
-
-	if (!r->alloc_capable ||
-	    r->membw.throttle_mode == THREAD_THROTTLE_UNDEFINED)
-		return;
-
-	rft = rdtgroup_get_rftype_by_name("thread_throttle_mode");
-	if (!rft)
-		return;
-
-	rft->fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_MB;
-}
-
-void mbm_config_rftype_init(const char *config)
-{
-	struct rftype *rft;
-
-	rft = rdtgroup_get_rftype_by_name(config);
-	if (rft)
-		rft->fflags = RFTYPE_MON_INFO | RFTYPE_RES_CACHE;
-}
-
-/**
- * rdtgroup_kn_mode_restrict - Restrict user access to named resctrl file
- * @r: The resource group with which the file is associated.
- * @name: Name of the file
- *
- * The permissions of named resctrl file, directory, or link are modified
- * to not allow read, write, or execute by any user.
- *
- * WARNING: This function is intended to communicate to the user that the
- * resctrl file has been locked down - that it is not relevant to the
- * particular state the system finds itself in. It should not be relied
- * on to protect from user access because after the file's permissions
- * are restricted the user can still change the permissions using chmod
- * from the command line.
- *
- * Return: 0 on success, <0 on failure.
- */
-int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name)
-{
-	struct iattr iattr = {.ia_valid = ATTR_MODE,};
-	struct kernfs_node *kn;
-	int ret = 0;
-
-	kn = kernfs_find_and_get_ns(r->kn, name, NULL);
-	if (!kn)
-		return -ENOENT;
-
-	switch (kernfs_type(kn)) {
-	case KERNFS_DIR:
-		iattr.ia_mode = S_IFDIR;
-		break;
-	case KERNFS_FILE:
-		iattr.ia_mode = S_IFREG;
-		break;
-	case KERNFS_LINK:
-		iattr.ia_mode = S_IFLNK;
-		break;
-	}
-
-	ret = kernfs_setattr(kn, &iattr);
-	kernfs_put(kn);
-	return ret;
-}
-
-/**
- * rdtgroup_kn_mode_restore - Restore user access to named resctrl file
- * @r: The resource group with which the file is associated.
- * @name: Name of the file
- * @mask: Mask of permissions that should be restored
- *
- * Restore the permissions of the named file. If @name is a directory the
- * permissions of its parent will be used.
- *
- * Return: 0 on success, <0 on failure.
- */
-int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
-			     umode_t mask)
-{
-	struct iattr iattr = {.ia_valid = ATTR_MODE,};
-	struct kernfs_node *kn, *parent;
-	struct rftype *rfts, *rft;
-	int ret, len;
-
-	rfts = res_common_files;
-	len = ARRAY_SIZE(res_common_files);
-
-	for (rft = rfts; rft < rfts + len; rft++) {
-		if (!strcmp(rft->name, name))
-			iattr.ia_mode = rft->mode & mask;
-	}
-
-	kn = kernfs_find_and_get_ns(r->kn, name, NULL);
-	if (!kn)
-		return -ENOENT;
-
-	switch (kernfs_type(kn)) {
-	case KERNFS_DIR:
-		parent = kernfs_get_parent(kn);
-		if (parent) {
-			iattr.ia_mode |= parent->mode;
-			kernfs_put(parent);
-		}
-		iattr.ia_mode |= S_IFDIR;
-		break;
-	case KERNFS_FILE:
-		iattr.ia_mode |= S_IFREG;
-		break;
-	case KERNFS_LINK:
-		iattr.ia_mode |= S_IFLNK;
-		break;
-	}
-
-	ret = kernfs_setattr(kn, &iattr);
-	kernfs_put(kn);
-	return ret;
-}
-
-static int rdtgroup_mkdir_info_resdir(void *priv, char *name,
-				      unsigned long fflags)
-{
-	struct kernfs_node *kn_subdir;
-	int ret;
-
-	kn_subdir = kernfs_create_dir(kn_info, name,
-				      kn_info->mode, priv);
-	if (IS_ERR(kn_subdir))
-		return PTR_ERR(kn_subdir);
-
-	ret = rdtgroup_kn_set_ugid(kn_subdir);
-	if (ret)
-		return ret;
-
-	ret = rdtgroup_add_files(kn_subdir, fflags);
-	if (!ret)
-		kernfs_activate(kn_subdir);
-
-	return ret;
-}
-
-static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
-{
-	enum resctrl_res_level i;
-	struct resctrl_schema *s;
-	struct rdt_resource *r;
-	unsigned long fflags;
-	char name[32];
-	int ret;
-
-	/* create the directory */
-	kn_info = kernfs_create_dir(parent_kn, "info", parent_kn->mode, NULL);
-	if (IS_ERR(kn_info))
-		return PTR_ERR(kn_info);
-
-	ret = rdtgroup_add_files(kn_info, RFTYPE_TOP_INFO);
-	if (ret)
-		goto out_destroy;
-
-	/* loop over enabled controls, these are all alloc_capable */
-	list_for_each_entry(s, &resctrl_schema_all, list) {
-		r = s->res;
-		fflags = r->fflags | RFTYPE_CTRL_INFO;
-		ret = rdtgroup_mkdir_info_resdir(s, s->name, fflags);
-		if (ret)
-			goto out_destroy;
-	}
-
-	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
-		r = resctrl_arch_get_resource(i);
-		if (!r->mon_capable)
-			continue;
-
-		fflags =  r->fflags | RFTYPE_MON_INFO;
-		sprintf(name, "%s_MON", r->name);
-		ret = rdtgroup_mkdir_info_resdir(r, name, fflags);
-		if (ret)
-			goto out_destroy;
-	}
-
-	ret = rdtgroup_kn_set_ugid(kn_info);
-	if (ret)
-		goto out_destroy;
-
-	kernfs_activate(kn_info);
-
-	return 0;
-
-out_destroy:
-	kernfs_remove(kn_info);
-	return ret;
-}
-
-static int
-mongroup_create_dir(struct kernfs_node *parent_kn, struct rdtgroup *prgrp,
-		    char *name, struct kernfs_node **dest_kn)
-{
-	struct kernfs_node *kn;
-	int ret;
-
-	/* create the directory */
-	kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp);
-	if (IS_ERR(kn))
-		return PTR_ERR(kn);
-
-	if (dest_kn)
-		*dest_kn = kn;
-
-	ret = rdtgroup_kn_set_ugid(kn);
-	if (ret)
-		goto out_destroy;
-
-	kernfs_activate(kn);
-
-	return 0;
-
-out_destroy:
-	kernfs_remove(kn);
-	return ret;
-}
-
-static inline bool is_mba_linear(void)
-{
-	return resctrl_arch_get_resource(RDT_RESOURCE_MBA)->membw.delay_linear;
-}
-
-static int mba_sc_domain_allocate(struct rdt_resource *r, struct rdt_domain *d)
-{
-	u32 num_closid = resctrl_arch_get_num_closid(r);
-	int cpu = cpumask_any(&d->cpu_mask);
-	int i;
-
-	d->mbps_val = kcalloc_node(num_closid, sizeof(*d->mbps_val),
-				   GFP_KERNEL, cpu_to_node(cpu));
-	if (!d->mbps_val)
-		return -ENOMEM;
-
-	for (i = 0; i < num_closid; i++)
-		d->mbps_val[i] = MBA_MAX_MBPS;
-
-	return 0;
-}
-
-static void mba_sc_domain_destroy(struct rdt_resource *r,
-				  struct rdt_domain *d)
-{
-	kfree(d->mbps_val);
-	d->mbps_val = NULL;
-}
-
-/*
- * MBA software controller is supported only if
- * MBM is supported and MBA is in linear scale.
- */
-static bool supports_mba_mbps(void)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-
-	return (resctrl_arch_is_mbm_local_enabled() &&
-		r->alloc_capable && is_mba_linear());
-}
-
-/*
- * Enable or disable the MBA software controller
- * which helps user specify bandwidth in MBps.
- */
-static int set_mba_sc(bool mba_sc)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-	u32 num_closid = resctrl_arch_get_num_closid(r);
-	struct rdt_domain *d;
-	int i;
-
-	if (!supports_mba_mbps() || mba_sc == is_mba_sc(r))
-		return -EINVAL;
-
-	r->membw.mba_sc = mba_sc;
-
-	list_for_each_entry(d, &r->domains, list) {
-		for (i = 0; i < num_closid; i++)
-			d->mbps_val[i] = MBA_MAX_MBPS;
-	}
-
-	return 0;
-}
-
-/*
- * We don't allow rdtgroup directories to be created anywhere
- * except the root directory. Thus when looking for the rdtgroup
- * structure for a kernfs node we are either looking at a directory,
- * in which case the rdtgroup structure is pointed at by the "priv"
- * field, otherwise we have a file, and need only look to the parent
- * to find the rdtgroup.
- */
-static struct rdtgroup *kernfs_to_rdtgroup(struct kernfs_node *kn)
-{
-	if (kernfs_type(kn) == KERNFS_DIR) {
-		/*
-		 * All the resource directories use "kn->priv"
-		 * to point to the "struct rdtgroup" for the
-		 * resource. "info" and its subdirectories don't
-		 * have rdtgroup structures, so return NULL here.
-		 */
-		if (kn == kn_info || kn->parent == kn_info)
-			return NULL;
-		else
-			return kn->priv;
-	} else {
-		return kn->parent->priv;
-	}
-}
-
-static void rdtgroup_kn_get(struct rdtgroup *rdtgrp, struct kernfs_node *kn)
-{
-	atomic_inc(&rdtgrp->waitcount);
-	kernfs_break_active_protection(kn);
-}
-
-static void rdtgroup_kn_put(struct rdtgroup *rdtgrp, struct kernfs_node *kn)
-{
-	if (atomic_dec_and_test(&rdtgrp->waitcount) &&
-	    (rdtgrp->flags & RDT_DELETED)) {
-		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
-		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)
-			rdtgroup_pseudo_lock_remove(rdtgrp);
-		kernfs_unbreak_active_protection(kn);
-		rdtgroup_remove(rdtgrp);
-	} else {
-		kernfs_unbreak_active_protection(kn);
-	}
-}
-
-struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn)
-{
-	struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn);
-
-	if (!rdtgrp)
-		return NULL;
-
-	rdtgroup_kn_get(rdtgrp, kn);
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	/* Was this group deleted while we waited? */
-	if (rdtgrp->flags & RDT_DELETED)
-		return NULL;
-
-	return rdtgrp;
-}
-
-void rdtgroup_kn_unlock(struct kernfs_node *kn)
-{
-	struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn);
-
-	if (!rdtgrp)
-		return;
-
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-
-	rdtgroup_kn_put(rdtgrp, kn);
-}
-
-static int mkdir_mondata_all(struct kernfs_node *parent_kn,
-			     struct rdtgroup *prgrp,
-			     struct kernfs_node **mon_data_kn);
-
-static void rdt_disable_ctx(void)
-{
-	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
-	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
-	set_mba_sc(false);
-
-	resctrl_debug = false;
-}
-
-static int rdt_enable_ctx(struct rdt_fs_context *ctx)
-{
-	int ret = 0;
-
-	if (ctx->enable_cdpl2) {
-		ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, true);
-		if (ret)
-			goto out_done;
-	}
-
-	if (ctx->enable_cdpl3) {
-		ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, true);
-		if (ret)
-			goto out_cdpl2;
-	}
-
-	if (ctx->enable_mba_mbps) {
-		ret = set_mba_sc(true);
-		if (ret)
-			goto out_cdpl3;
-	}
-
-	if (ctx->enable_debug)
-		resctrl_debug = true;
-
-	return 0;
-
-out_cdpl3:
-	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
-out_cdpl2:
-	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
-out_done:
-	return ret;
-}
-
-static int schemata_list_add(struct rdt_resource *r, enum resctrl_conf_type type)
-{
-	struct resctrl_schema *s;
-	const char *suffix = "";
-	int ret, cl;
-
-	s = kzalloc(sizeof(*s), GFP_KERNEL);
-	if (!s)
-		return -ENOMEM;
-
-	s->res = r;
-	s->num_closid = resctrl_arch_get_num_closid(r);
-	if (resctrl_arch_get_cdp_enabled(r->rid))
-		s->num_closid /= 2;
-
-	s->conf_type = type;
-	switch (type) {
-	case CDP_CODE:
-		suffix = "CODE";
-		break;
-	case CDP_DATA:
-		suffix = "DATA";
-		break;
-	case CDP_NONE:
-		suffix = "";
-		break;
-	}
-
-	ret = snprintf(s->name, sizeof(s->name), "%s%s", r->name, suffix);
-	if (ret >= sizeof(s->name)) {
-		kfree(s);
-		return -EINVAL;
-	}
-
-	cl = strlen(s->name);
-
-	/*
-	 * If CDP is supported by this resource, but not enabled,
-	 * include the suffix. This ensures the tabular format of the
-	 * schemata file does not change between mounts of the filesystem.
-	 */
-	if (r->cdp_capable && !resctrl_arch_get_cdp_enabled(r->rid))
-		cl += 4;
-
-	if (cl > max_name_width)
-		max_name_width = cl;
-
-	/*
-	 * Choose a width for the resource data based on the resource that has
-	 * widest name and cbm.
-	 */
-	max_data_width = max(max_data_width, r->data_width);
-
-	INIT_LIST_HEAD(&s->list);
-	list_add(&s->list, &resctrl_schema_all);
-
-	return 0;
-}
-
-static int schemata_list_create(void)
-{
-	enum resctrl_res_level i;
-	struct rdt_resource *r;
-	int ret = 0;
-
-	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
-		r = resctrl_arch_get_resource(i);
-		if (!r->alloc_capable)
-			continue;
-
-		if (resctrl_arch_get_cdp_enabled(r->rid)) {
-			ret = schemata_list_add(r, CDP_CODE);
-			if (ret)
-				break;
-
-			ret = schemata_list_add(r, CDP_DATA);
-		} else {
-			ret = schemata_list_add(r, CDP_NONE);
-		}
-
-		if (ret)
-			break;
-	}
-
-	return ret;
-}
-
-static void schemata_list_destroy(void)
-{
-	struct resctrl_schema *s, *tmp;
-
-	list_for_each_entry_safe(s, tmp, &resctrl_schema_all, list) {
-		list_del(&s->list);
-		kfree(s);
-	}
-}
-
-static int rdt_get_tree(struct fs_context *fc)
-{
-	struct rdt_resource *l3 = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	struct rdt_fs_context *ctx = rdt_fc2context(fc);
-	unsigned long flags = RFTYPE_CTRL_BASE;
-	struct rdt_domain *dom;
-	int ret;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-	/*
-	 * resctrl file system can only be mounted once.
-	 */
-	if (resctrl_mounted) {
-		ret = -EBUSY;
-		goto out;
-	}
-
-	ret = rdtgroup_setup_root(ctx);
-	if (ret)
-		goto out;
-
-	ret = rdt_enable_ctx(ctx);
-	if (ret)
-		goto out_root;
-
-	ret = schemata_list_create();
-	if (ret) {
-		schemata_list_destroy();
-		goto out_ctx;
-	}
-
-	closid_init();
-
-	if (resctrl_arch_mon_capable())
-		flags |= RFTYPE_MON;
-
-	ret = rdtgroup_add_files(rdtgroup_default.kn, flags);
-	if (ret)
-		goto out_schemata_free;
-
-	kernfs_activate(rdtgroup_default.kn);
-
-	ret = rdtgroup_create_info_dir(rdtgroup_default.kn);
-	if (ret < 0)
-		goto out_schemata_free;
-
-	if (resctrl_arch_mon_capable()) {
-		ret = mongroup_create_dir(rdtgroup_default.kn,
-					  &rdtgroup_default, "mon_groups",
-					  &kn_mongrp);
-		if (ret < 0)
-			goto out_info;
-
-		ret = mkdir_mondata_all(rdtgroup_default.kn,
-					&rdtgroup_default, &kn_mondata);
-		if (ret < 0)
-			goto out_mongrp;
-		rdtgroup_default.mon.mon_data_kn = kn_mondata;
-	}
-
-	ret = rdt_pseudo_lock_init();
-	if (ret)
-		goto out_mondata;
-
-	ret = kernfs_get_tree(fc);
-	if (ret < 0)
-		goto out_psl;
-
-	if (resctrl_arch_alloc_capable())
-		resctrl_arch_enable_alloc();
-	if (resctrl_arch_mon_capable())
-		resctrl_arch_enable_mon();
-
-	if (resctrl_arch_alloc_capable() || resctrl_arch_mon_capable())
-		resctrl_mounted = true;
-
-	if (resctrl_is_mbm_enabled()) {
-		list_for_each_entry(dom, &l3->domains, list)
-			mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL,
-						   RESCTRL_PICK_ANY_CPU);
-	}
-
-	goto out;
-
-out_psl:
-	rdt_pseudo_lock_release();
-out_mondata:
-	if (resctrl_arch_mon_capable())
-		kernfs_remove(kn_mondata);
-out_mongrp:
-	if (resctrl_arch_mon_capable())
-		kernfs_remove(kn_mongrp);
-out_info:
-	kernfs_remove(kn_info);
-out_schemata_free:
-	schemata_list_destroy();
-out_ctx:
-	rdt_disable_ctx();
-out_root:
-	rdtgroup_destroy_root();
-out:
-	rdt_last_cmd_clear();
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-	return ret;
-}
-
-enum rdt_param {
-	Opt_cdp,
-	Opt_cdpl2,
-	Opt_mba_mbps,
-	Opt_debug,
-	nr__rdt_params
-};
-
-static const struct fs_parameter_spec rdt_fs_parameters[] = {
-	fsparam_flag("cdp",		Opt_cdp),
-	fsparam_flag("cdpl2",		Opt_cdpl2),
-	fsparam_flag("mba_MBps",	Opt_mba_mbps),
-	fsparam_flag("debug",		Opt_debug),
-	{}
-};
-
-static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
-{
-	struct rdt_fs_context *ctx = rdt_fc2context(fc);
-	struct fs_parse_result result;
-	int opt;
-
-	opt = fs_parse(fc, rdt_fs_parameters, param, &result);
-	if (opt < 0)
-		return opt;
-
-	switch (opt) {
-	case Opt_cdp:
-		ctx->enable_cdpl3 = true;
-		return 0;
-	case Opt_cdpl2:
-		ctx->enable_cdpl2 = true;
-		return 0;
-	case Opt_mba_mbps:
-		if (!supports_mba_mbps())
-			return -EINVAL;
-		ctx->enable_mba_mbps = true;
-		return 0;
-	case Opt_debug:
-		ctx->enable_debug = true;
-		return 0;
-	}
-
-	return -EINVAL;
-}
-
-static void rdt_fs_context_free(struct fs_context *fc)
-{
-	struct rdt_fs_context *ctx = rdt_fc2context(fc);
-
-	kernfs_free_fs_context(fc);
-	kfree(ctx);
-}
-
-static const struct fs_context_operations rdt_fs_context_ops = {
-	.free		= rdt_fs_context_free,
-	.parse_param	= rdt_parse_param,
-	.get_tree	= rdt_get_tree,
-};
-
-static int rdt_init_fs_context(struct fs_context *fc)
-{
-	struct rdt_fs_context *ctx;
-
-	ctx = kzalloc(sizeof(struct rdt_fs_context), GFP_KERNEL);
-	if (!ctx)
-		return -ENOMEM;
-
-	ctx->kfc.magic = RDTGROUP_SUPER_MAGIC;
-	fc->fs_private = &ctx->kfc;
-	fc->ops = &rdt_fs_context_ops;
-	put_user_ns(fc->user_ns);
-	fc->user_ns = get_user_ns(&init_user_ns);
-	fc->global = true;
-	return 0;
-}
-
-/*
- * Move tasks from one to the other group. If @from is NULL, then all tasks
- * in the systems are moved unconditionally (used for teardown).
- *
- * If @mask is not NULL the cpus on which moved tasks are running are set
- * in that mask so the update smp function call is restricted to affected
- * cpus.
- */
-static void rdt_move_group_tasks(struct rdtgroup *from, struct rdtgroup *to,
-				 struct cpumask *mask)
-{
-	struct task_struct *p, *t;
-
-	read_lock(&tasklist_lock);
-	for_each_process_thread(p, t) {
-		if (!from || is_closid_match(t, from) ||
-		    is_rmid_match(t, from)) {
-			resctrl_arch_set_closid_rmid(t, to->closid,
-						     to->mon.rmid);
-
-			/*
-			 * Order the closid/rmid stores above before the loads
-			 * in task_curr(). This pairs with the full barrier
-			 * between the rq->curr update and
-			 * resctrl_arch_sched_in() during context switch.
-			 */
-			smp_mb();
-
-			/*
-			 * If the task is on a CPU, set the CPU in the mask.
-			 * The detection is inaccurate as tasks might move or
-			 * schedule before the smp function call takes place.
-			 * In such a case the function call is pointless, but
-			 * there is no other side effect.
-			 */
-			if (IS_ENABLED(CONFIG_SMP) && mask && task_curr(t))
-				cpumask_set_cpu(task_cpu(t), mask);
-		}
-	}
-	read_unlock(&tasklist_lock);
-}
-
-static void free_all_child_rdtgrp(struct rdtgroup *rdtgrp)
-{
-	struct rdtgroup *sentry, *stmp;
-	struct list_head *head;
-
-	head = &rdtgrp->mon.crdtgrp_list;
-	list_for_each_entry_safe(sentry, stmp, head, mon.crdtgrp_list) {
-		free_rmid(sentry->closid, sentry->mon.rmid);
-		list_del(&sentry->mon.crdtgrp_list);
-
-		if (atomic_read(&sentry->waitcount) != 0)
-			sentry->flags = RDT_DELETED;
-		else
-			rdtgroup_remove(sentry);
-	}
-}
-
-/*
- * Forcibly remove all of subdirectories under root.
- */
-static void rmdir_all_sub(void)
-{
-	struct rdtgroup *rdtgrp, *tmp;
-
-	/* Move all tasks to the default resource group */
-	rdt_move_group_tasks(NULL, &rdtgroup_default, NULL);
-
-	list_for_each_entry_safe(rdtgrp, tmp, &rdt_all_groups, rdtgroup_list) {
-		/* Free any child rmids */
-		free_all_child_rdtgrp(rdtgrp);
-
-		/* Remove each rdtgroup other than root */
-		if (rdtgrp == &rdtgroup_default)
-			continue;
-
-		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
-		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)
-			rdtgroup_pseudo_lock_remove(rdtgrp);
-
-		/*
-		 * Give any CPUs back to the default group. We cannot copy
-		 * cpu_online_mask because a CPU might have executed the
-		 * offline callback already, but is still marked online.
-		 */
-		cpumask_or(&rdtgroup_default.cpu_mask,
-			   &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);
-
-		free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
-
-		kernfs_remove(rdtgrp->kn);
-		list_del(&rdtgrp->rdtgroup_list);
-
-		if (atomic_read(&rdtgrp->waitcount) != 0)
-			rdtgrp->flags = RDT_DELETED;
-		else
-			rdtgroup_remove(rdtgrp);
-	}
-	/* Notify online CPUs to update per cpu storage and PQR_ASSOC MSR */
-	update_closid_rmid(cpu_online_mask, &rdtgroup_default);
-
-	kernfs_remove(kn_info);
-	kernfs_remove(kn_mongrp);
-	kernfs_remove(kn_mondata);
-}
-
-static void rdt_kill_sb(struct super_block *sb)
-{
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	rdt_disable_ctx();
-
-	/* Put everything back to default values. */
-	resctrl_arch_reset_resources();
-
-	rmdir_all_sub();
-	rdt_pseudo_lock_release();
-	rdtgroup_default.mode = RDT_MODE_SHAREABLE;
-	schemata_list_destroy();
-	rdtgroup_destroy_root();
-	if (resctrl_arch_alloc_capable())
-		resctrl_arch_disable_alloc();
-	if (resctrl_arch_mon_capable())
-		resctrl_arch_disable_mon();
-	resctrl_mounted = false;
-	kernfs_kill_sb(sb);
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-}
-
-static struct file_system_type rdt_fs_type = {
-	.name			= "resctrl",
-	.init_fs_context	= rdt_init_fs_context,
-	.parameters		= rdt_fs_parameters,
-	.kill_sb		= rdt_kill_sb,
-};
-
-static int mon_addfile(struct kernfs_node *parent_kn, const char *name,
-		       void *priv)
-{
-	struct kernfs_node *kn;
-	int ret = 0;
-
-	kn = __kernfs_create_file(parent_kn, name, 0444,
-				  GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, 0,
-				  &kf_mondata_ops, priv, NULL, NULL);
-	if (IS_ERR(kn))
-		return PTR_ERR(kn);
-
-	ret = rdtgroup_kn_set_ugid(kn);
-	if (ret) {
-		kernfs_remove(kn);
-		return ret;
-	}
-
-	return ret;
-}
-
-/*
- * Remove all subdirectories of mon_data of ctrl_mon groups
- * and monitor groups with given domain id.
- */
-static void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
-					   unsigned int dom_id)
-{
-	struct rdtgroup *prgrp, *crgrp;
-	char name[32];
-
-	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
-		sprintf(name, "mon_%s_%02d", r->name, dom_id);
-		kernfs_remove_by_name(prgrp->mon.mon_data_kn, name);
-
-		list_for_each_entry(crgrp, &prgrp->mon.crdtgrp_list, mon.crdtgrp_list)
-			kernfs_remove_by_name(crgrp->mon.mon_data_kn, name);
-	}
-}
-
-static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
-				struct rdt_domain *d,
-				struct rdt_resource *r, struct rdtgroup *prgrp)
-{
-	union mon_data_bits priv;
-	struct kernfs_node *kn;
-	struct mon_evt *mevt;
-	struct rmid_read rr;
-	char name[32];
-	int ret;
-
-	sprintf(name, "mon_%s_%02d", r->name, d->id);
-	/* create the directory */
-	kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp);
-	if (IS_ERR(kn))
-		return PTR_ERR(kn);
-
-	ret = rdtgroup_kn_set_ugid(kn);
-	if (ret)
-		goto out_destroy;
-
-	if (WARN_ON(list_empty(&r->evt_list))) {
-		ret = -EPERM;
-		goto out_destroy;
-	}
-
-	priv.u.rid = r->rid;
-	priv.u.domid = d->id;
-	list_for_each_entry(mevt, &r->evt_list, list) {
-		priv.u.evtid = mevt->evtid;
-		ret = mon_addfile(kn, mevt->name, priv.priv);
-		if (ret)
-			goto out_destroy;
-
-		if (resctrl_is_mbm_event(mevt->evtid))
-			mon_event_read(&rr, r, d, prgrp, mevt->evtid, true);
-	}
-	kernfs_activate(kn);
-	return 0;
-
-out_destroy:
-	kernfs_remove(kn);
-	return ret;
-}
-
-/*
- * Add all subdirectories of mon_data for "ctrl_mon" groups
- * and "monitor" groups with given domain id.
- */
-static void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
-					   struct rdt_domain *d)
-{
-	struct kernfs_node *parent_kn;
-	struct rdtgroup *prgrp, *crgrp;
-	struct list_head *head;
-
-	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
-		parent_kn = prgrp->mon.mon_data_kn;
-		mkdir_mondata_subdir(parent_kn, d, r, prgrp);
-
-		head = &prgrp->mon.crdtgrp_list;
-		list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
-			parent_kn = crgrp->mon.mon_data_kn;
-			mkdir_mondata_subdir(parent_kn, d, r, crgrp);
-		}
-	}
-}
-
-static int mkdir_mondata_subdir_alldom(struct kernfs_node *parent_kn,
-				       struct rdt_resource *r,
-				       struct rdtgroup *prgrp)
-{
-	struct rdt_domain *dom;
-	int ret;
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	list_for_each_entry(dom, &r->domains, list) {
-		ret = mkdir_mondata_subdir(parent_kn, dom, r, prgrp);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
-/*
- * This creates a directory mon_data which contains the monitored data.
- *
- * mon_data has one directory for each domain which are named
- * in the format mon_<domain_name>_<domain_id>. For ex: A mon_data
- * with L3 domain looks as below:
- * ./mon_data:
- * mon_L3_00
- * mon_L3_01
- * mon_L3_02
- * ...
- *
- * Each domain directory has one file per event:
- * ./mon_L3_00/:
- * llc_occupancy
- *
- */
-static int mkdir_mondata_all(struct kernfs_node *parent_kn,
-			     struct rdtgroup *prgrp,
-			     struct kernfs_node **dest_kn)
-{
-	enum resctrl_res_level i;
-	struct rdt_resource *r;
-	struct kernfs_node *kn;
-	int ret;
-
-	/*
-	 * Create the mon_data directory first.
-	 */
-	ret = mongroup_create_dir(parent_kn, prgrp, "mon_data", &kn);
-	if (ret)
-		return ret;
-
-	if (dest_kn)
-		*dest_kn = kn;
-
-	/*
-	 * Create the subdirectories for each domain. Note that all events
-	 * in a domain like L3 are grouped into a resource whose domain is L3
-	 */
-	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
-		r = resctrl_arch_get_resource(i);
-		if (!r->mon_capable)
-			continue;
-
-		ret = mkdir_mondata_subdir_alldom(kn, r, prgrp);
-		if (ret)
-			goto out_destroy;
-	}
-
-	return 0;
-
-out_destroy:
-	kernfs_remove(kn);
-	return ret;
-}
-
-/**
- * cbm_ensure_valid - Enforce validity on provided CBM
- * @_val:	Candidate CBM
- * @r:		RDT resource to which the CBM belongs
- *
- * The provided CBM represents all cache portions available for use. This
- * may be represented by a bitmap that does not consist of contiguous ones
- * and thus be an invalid CBM.
- * Here the provided CBM is forced to be a valid CBM by only considering
- * the first set of contiguous bits as valid and clearing all bits.
- * The intention here is to provide a valid default CBM with which a new
- * resource group is initialized. The user can follow this with a
- * modification to the CBM if the default does not satisfy the
- * requirements.
- */
-static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
-{
-	unsigned int cbm_len = r->cache.cbm_len;
-	unsigned long first_bit, zero_bit;
-	unsigned long val = _val;
-
-	if (!val)
-		return 0;
-
-	first_bit = find_first_bit(&val, cbm_len);
-	zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
-
-	/* Clear any remaining bits to ensure contiguous region */
-	bitmap_clear(&val, zero_bit, cbm_len - zero_bit);
-	return (u32)val;
-}
-
-/*
- * Initialize cache resources per RDT domain
- *
- * Set the RDT domain up to start off with all usable allocations. That is,
- * all shareable and unused bits. All-zero CBM is invalid.
- */
-static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
-				 u32 closid)
-{
-	enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
-	enum resctrl_conf_type t = s->conf_type;
-	struct resctrl_staged_config *cfg;
-	struct rdt_resource *r = s->res;
-	u32 used_b = 0, unused_b = 0;
-	unsigned long tmp_cbm;
-	enum rdtgrp_mode mode;
-	u32 peer_ctl, ctrl_val;
-	int i;
-
-	cfg = &d->staged_config[t];
-	cfg->have_new_ctrl = false;
-	cfg->new_ctrl = r->cache.shareable_bits;
-	used_b = r->cache.shareable_bits;
-	for (i = 0; i < closids_supported(); i++) {
-		if (closid_allocated(i) && i != closid) {
-			mode = rdtgroup_mode_by_closid(i);
-			if (mode == RDT_MODE_PSEUDO_LOCKSETUP)
-				/*
-				 * ctrl values for locksetup aren't relevant
-				 * until the schemata is written, and the mode
-				 * becomes RDT_MODE_PSEUDO_LOCKED.
-				 */
-				continue;
-			/*
-			 * If CDP is active include peer domain's
-			 * usage to ensure there is no overlap
-			 * with an exclusive group.
-			 */
-			if (resctrl_arch_get_cdp_enabled(r->rid))
-				peer_ctl = resctrl_arch_get_config(r, d, i,
-								   peer_type);
-			else
-				peer_ctl = 0;
-			ctrl_val = resctrl_arch_get_config(r, d, i,
-							   s->conf_type);
-			used_b |= ctrl_val | peer_ctl;
-			if (mode == RDT_MODE_SHAREABLE)
-				cfg->new_ctrl |= ctrl_val | peer_ctl;
-		}
-	}
-	if (d->plr && d->plr->cbm > 0)
-		used_b |= d->plr->cbm;
-	unused_b = used_b ^ (BIT_MASK(r->cache.cbm_len) - 1);
-	unused_b &= BIT_MASK(r->cache.cbm_len) - 1;
-	cfg->new_ctrl |= unused_b;
-	/*
-	 * Force the initial CBM to be valid, user can
-	 * modify the CBM based on system availability.
-	 */
-	cfg->new_ctrl = cbm_ensure_valid(cfg->new_ctrl, r);
-	/*
-	 * Assign the u32 CBM to an unsigned long to ensure that
-	 * bitmap_weight() does not access out-of-bound memory.
-	 */
-	tmp_cbm = cfg->new_ctrl;
-	if (bitmap_weight(&tmp_cbm, r->cache.cbm_len) < r->cache.min_cbm_bits) {
-		rdt_last_cmd_printf("No space on %s:%d\n", s->name, d->id);
-		return -ENOSPC;
-	}
-	cfg->have_new_ctrl = true;
-
-	return 0;
-}
-
-/*
- * Initialize cache resources with default values.
- *
- * A new RDT group is being created on an allocation capable (CAT)
- * supporting system. Set this group up to start off with all usable
- * allocations.
- *
- * If there are no more shareable bits available on any domain then
- * the entire allocation will fail.
- */
-static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
-{
-	struct rdt_domain *d;
-	int ret;
-
-	list_for_each_entry(d, &s->res->domains, list) {
-		ret = __init_one_rdt_domain(d, s, closid);
-		if (ret < 0)
-			return ret;
-	}
-
-	return 0;
-}
-
-/* Initialize MBA resource with default values. */
-static void rdtgroup_init_mba(struct rdt_resource *r, u32 closid)
-{
-	struct resctrl_staged_config *cfg;
-	struct rdt_domain *d;
-
-	list_for_each_entry(d, &r->domains, list) {
-		if (is_mba_sc(r)) {
-			d->mbps_val[closid] = MBA_MAX_MBPS;
-			continue;
-		}
-
-		cfg = &d->staged_config[CDP_NONE];
-		cfg->new_ctrl = r->default_ctrl;
-		cfg->have_new_ctrl = true;
-	}
-}
-
-/* Initialize the RDT group's allocations. */
-static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
-{
-	struct resctrl_schema *s;
-	struct rdt_resource *r;
-	int ret = 0;
-
-	rdt_staged_configs_clear();
-
-	list_for_each_entry(s, &resctrl_schema_all, list) {
-		r = s->res;
-		if (r->rid == RDT_RESOURCE_MBA ||
-		    r->rid == RDT_RESOURCE_SMBA) {
-			rdtgroup_init_mba(r, rdtgrp->closid);
-			if (is_mba_sc(r))
-				continue;
-		} else {
-			ret = rdtgroup_init_cat(s, rdtgrp->closid);
-			if (ret < 0)
-				goto out;
-		}
-
-		ret = resctrl_arch_update_domains(r, rdtgrp->closid);
-		if (ret < 0) {
-			rdt_last_cmd_puts("Failed to initialize allocations\n");
-			goto out;
-		}
-
-	}
-
-	rdtgrp->mode = RDT_MODE_SHAREABLE;
-
-out:
-	rdt_staged_configs_clear();
-	return ret;
-}
-
-static int mkdir_rdt_prepare_rmid_alloc(struct rdtgroup *rdtgrp)
-{
-	int ret;
-
-	if (!resctrl_arch_mon_capable())
-		return 0;
-
-	ret = alloc_rmid(rdtgrp->closid);
-	if (ret < 0) {
-		rdt_last_cmd_puts("Out of RMIDs\n");
-		return ret;
-	}
-	rdtgrp->mon.rmid = ret;
-
-	ret = mkdir_mondata_all(rdtgrp->kn, rdtgrp, &rdtgrp->mon.mon_data_kn);
-	if (ret) {
-		rdt_last_cmd_puts("kernfs subdir error\n");
-		free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
-		return ret;
-	}
-
-	return 0;
-}
-
-static void mkdir_rdt_prepare_rmid_free(struct rdtgroup *rgrp)
-{
-	if (resctrl_arch_mon_capable())
-		free_rmid(rgrp->closid, rgrp->mon.rmid);
-}
-
-static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
-			     const char *name, umode_t mode,
-			     enum rdt_group_type rtype, struct rdtgroup **r)
-{
-	struct rdtgroup *prdtgrp, *rdtgrp;
-	unsigned long files = 0;
-	struct kernfs_node *kn;
-	int ret;
-
-	prdtgrp = rdtgroup_kn_lock_live(parent_kn);
-	if (!prdtgrp) {
-		ret = -ENODEV;
-		goto out_unlock;
-	}
-
-	if (rtype == RDTMON_GROUP &&
-	    (prdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
-	     prdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)) {
-		ret = -EINVAL;
-		rdt_last_cmd_puts("Pseudo-locking in progress\n");
-		goto out_unlock;
-	}
-
-	/* allocate the rdtgroup. */
-	rdtgrp = kzalloc(sizeof(*rdtgrp), GFP_KERNEL);
-	if (!rdtgrp) {
-		ret = -ENOSPC;
-		rdt_last_cmd_puts("Kernel out of memory\n");
-		goto out_unlock;
-	}
-	*r = rdtgrp;
-	rdtgrp->mon.parent = prdtgrp;
-	rdtgrp->type = rtype;
-	INIT_LIST_HEAD(&rdtgrp->mon.crdtgrp_list);
-
-	/* kernfs creates the directory for rdtgrp */
-	kn = kernfs_create_dir(parent_kn, name, mode, rdtgrp);
-	if (IS_ERR(kn)) {
-		ret = PTR_ERR(kn);
-		rdt_last_cmd_puts("kernfs create error\n");
-		goto out_free_rgrp;
-	}
-	rdtgrp->kn = kn;
-
-	/*
-	 * kernfs_remove() will drop the reference count on "kn" which
-	 * will free it. But we still need it to stick around for the
-	 * rdtgroup_kn_unlock(kn) call. Take one extra reference here,
-	 * which will be dropped by kernfs_put() in rdtgroup_remove().
-	 */
-	kernfs_get(kn);
-
-	ret = rdtgroup_kn_set_ugid(kn);
-	if (ret) {
-		rdt_last_cmd_puts("kernfs perm error\n");
-		goto out_destroy;
-	}
-
-	if (rtype == RDTCTRL_GROUP) {
-		files = RFTYPE_BASE | RFTYPE_CTRL;
-		if (resctrl_arch_mon_capable())
-			files |= RFTYPE_MON;
-	} else {
-		files = RFTYPE_BASE | RFTYPE_MON;
-	}
-
-	ret = rdtgroup_add_files(kn, files);
-	if (ret) {
-		rdt_last_cmd_puts("kernfs fill error\n");
-		goto out_destroy;
-	}
-
-	/*
-	 * The caller unlocks the parent_kn upon success.
-	 */
-	return 0;
-
-out_destroy:
-	kernfs_put(rdtgrp->kn);
-	kernfs_remove(rdtgrp->kn);
-out_free_rgrp:
-	kfree(rdtgrp);
-out_unlock:
-	rdtgroup_kn_unlock(parent_kn);
-	return ret;
-}
-
-static void mkdir_rdt_prepare_clean(struct rdtgroup *rgrp)
-{
-	kernfs_remove(rgrp->kn);
-	rdtgroup_remove(rgrp);
-}
-
-/*
- * Create a monitor group under "mon_groups" directory of a control
- * and monitor group(ctrl_mon). This is a resource group
- * to monitor a subset of tasks and cpus in its parent ctrl_mon group.
- */
-static int rdtgroup_mkdir_mon(struct kernfs_node *parent_kn,
-			      const char *name, umode_t mode)
-{
-	struct rdtgroup *rdtgrp, *prgrp;
-	int ret;
-
-	ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTMON_GROUP, &rdtgrp);
-	if (ret)
-		return ret;
-
-	prgrp = rdtgrp->mon.parent;
-	rdtgrp->closid = prgrp->closid;
-
-	ret = mkdir_rdt_prepare_rmid_alloc(rdtgrp);
-	if (ret) {
-		mkdir_rdt_prepare_clean(rdtgrp);
-		goto out_unlock;
-	}
-
-	kernfs_activate(rdtgrp->kn);
-
-	/*
-	 * Add the rdtgrp to the list of rdtgrps the parent
-	 * ctrl_mon group has to track.
-	 */
-	list_add_tail(&rdtgrp->mon.crdtgrp_list, &prgrp->mon.crdtgrp_list);
-
-out_unlock:
-	rdtgroup_kn_unlock(parent_kn);
-	return ret;
-}
-
-/*
- * These are rdtgroups created under the root directory. Can be used
- * to allocate and monitor resources.
- */
-static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn,
-				   const char *name, umode_t mode)
-{
-	struct rdtgroup *rdtgrp;
-	struct kernfs_node *kn;
-	u32 closid;
-	int ret;
-
-	ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTCTRL_GROUP, &rdtgrp);
-	if (ret)
-		return ret;
-
-	kn = rdtgrp->kn;
-	ret = closid_alloc();
-	if (ret < 0) {
-		rdt_last_cmd_puts("Out of CLOSIDs\n");
-		goto out_common_fail;
-	}
-	closid = ret;
-	ret = 0;
-
-	rdtgrp->closid = closid;
-
-	ret = mkdir_rdt_prepare_rmid_alloc(rdtgrp);
-	if (ret)
-		goto out_closid_free;
-
-	kernfs_activate(rdtgrp->kn);
-
-	ret = rdtgroup_init_alloc(rdtgrp);
-	if (ret < 0)
-		goto out_rmid_free;
-
-	list_add(&rdtgrp->rdtgroup_list, &rdt_all_groups);
-
-	if (resctrl_arch_mon_capable()) {
-		/*
-		 * Create an empty mon_groups directory to hold the subset
-		 * of tasks and cpus to monitor.
-		 */
-		ret = mongroup_create_dir(kn, rdtgrp, "mon_groups", NULL);
-		if (ret) {
-			rdt_last_cmd_puts("kernfs subdir error\n");
-			goto out_del_list;
-		}
-	}
-
-	goto out_unlock;
-
-out_del_list:
-	list_del(&rdtgrp->rdtgroup_list);
-out_rmid_free:
-	mkdir_rdt_prepare_rmid_free(rdtgrp);
-out_closid_free:
-	closid_free(closid);
-out_common_fail:
-	mkdir_rdt_prepare_clean(rdtgrp);
-out_unlock:
-	rdtgroup_kn_unlock(parent_kn);
-	return ret;
-}
-
-/*
- * We allow creating mon groups only with in a directory called "mon_groups"
- * which is present in every ctrl_mon group. Check if this is a valid
- * "mon_groups" directory.
- *
- * 1. The directory should be named "mon_groups".
- * 2. The mon group itself should "not" be named "mon_groups".
- *   This makes sure "mon_groups" directory always has a ctrl_mon group
- *   as parent.
- */
-static bool is_mon_groups(struct kernfs_node *kn, const char *name)
-{
-	return (!strcmp(kn->name, "mon_groups") &&
-		strcmp(name, "mon_groups"));
-}
-
-static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
-			  umode_t mode)
-{
-	/* Do not accept '\n' to avoid unparsable situation. */
-	if (strchr(name, '\n'))
-		return -EINVAL;
-
-	/*
-	 * If the parent directory is the root directory and RDT
-	 * allocation is supported, add a control and monitoring
-	 * subdirectory
-	 */
-	if (resctrl_arch_alloc_capable() && parent_kn == rdtgroup_default.kn)
-		return rdtgroup_mkdir_ctrl_mon(parent_kn, name, mode);
-
-	/*
-	 * If RDT monitoring is supported and the parent directory is a valid
-	 * "mon_groups" directory, add a monitoring subdirectory.
-	 */
-	if (resctrl_arch_mon_capable() && is_mon_groups(parent_kn, name))
-		return rdtgroup_mkdir_mon(parent_kn, name, mode);
-
-	return -EPERM;
-}
-
-static int rdtgroup_rmdir_mon(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
-{
-	struct rdtgroup *prdtgrp = rdtgrp->mon.parent;
-	u32 closid, rmid;
-	int cpu;
-
-	/* Give any tasks back to the parent group */
-	rdt_move_group_tasks(rdtgrp, prdtgrp, tmpmask);
-
-	/* Update per cpu rmid of the moved CPUs first */
-	closid = rdtgrp->closid;
-	rmid = prdtgrp->mon.rmid;
-	for_each_cpu(cpu, &rdtgrp->cpu_mask)
-		resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
-
-	/*
-	 * Update the MSR on moved CPUs and CPUs which have moved
-	 * task running on them.
-	 */
-	cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask);
-	update_closid_rmid(tmpmask, NULL);
-
-	rdtgrp->flags = RDT_DELETED;
-	free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
-
-	/*
-	 * Remove the rdtgrp from the parent ctrl_mon group's list
-	 */
-	WARN_ON(list_empty(&prdtgrp->mon.crdtgrp_list));
-	list_del(&rdtgrp->mon.crdtgrp_list);
-
-	kernfs_remove(rdtgrp->kn);
-
-	return 0;
-}
-
-static int rdtgroup_ctrl_remove(struct rdtgroup *rdtgrp)
-{
-	rdtgrp->flags = RDT_DELETED;
-	list_del(&rdtgrp->rdtgroup_list);
-
-	kernfs_remove(rdtgrp->kn);
-	return 0;
-}
-
-static int rdtgroup_rmdir_ctrl(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
-{
-	u32 closid, rmid;
-	int cpu;
-
-	/* Give any tasks back to the default group */
-	rdt_move_group_tasks(rdtgrp, &rdtgroup_default, tmpmask);
-
-	/* Give any CPUs back to the default group */
-	cpumask_or(&rdtgroup_default.cpu_mask,
-		   &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);
-
-	/* Update per cpu closid and rmid of the moved CPUs first */
-	closid = rdtgroup_default.closid;
-	rmid = rdtgroup_default.mon.rmid;
-	for_each_cpu(cpu, &rdtgrp->cpu_mask)
-		resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
-
-	/*
-	 * Update the MSR on moved CPUs and CPUs which have moved
-	 * task running on them.
-	 */
-	cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask);
-	update_closid_rmid(tmpmask, NULL);
-
-	free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
-	closid_free(rdtgrp->closid);
-
-	rdtgroup_ctrl_remove(rdtgrp);
-
-	/*
-	 * Free all the child monitor group rmids.
-	 */
-	free_all_child_rdtgrp(rdtgrp);
-
-	return 0;
-}
-
-static int rdtgroup_rmdir(struct kernfs_node *kn)
-{
-	struct kernfs_node *parent_kn = kn->parent;
-	struct rdtgroup *rdtgrp;
-	cpumask_var_t tmpmask;
-	int ret = 0;
-
-	if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL))
-		return -ENOMEM;
-
-	rdtgrp = rdtgroup_kn_lock_live(kn);
-	if (!rdtgrp) {
-		ret = -EPERM;
-		goto out;
-	}
-
-	/*
-	 * If the rdtgroup is a ctrl_mon group and parent directory
-	 * is the root directory, remove the ctrl_mon group.
-	 *
-	 * If the rdtgroup is a mon group and parent directory
-	 * is a valid "mon_groups" directory, remove the mon group.
-	 */
-	if (rdtgrp->type == RDTCTRL_GROUP && parent_kn == rdtgroup_default.kn &&
-	    rdtgrp != &rdtgroup_default) {
-		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
-		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
-			ret = rdtgroup_ctrl_remove(rdtgrp);
-		} else {
-			ret = rdtgroup_rmdir_ctrl(rdtgrp, tmpmask);
-		}
-	} else if (rdtgrp->type == RDTMON_GROUP &&
-		 is_mon_groups(parent_kn, kn->name)) {
-		ret = rdtgroup_rmdir_mon(rdtgrp, tmpmask);
-	} else {
-		ret = -EPERM;
-	}
-
-out:
-	rdtgroup_kn_unlock(kn);
-	free_cpumask_var(tmpmask);
-	return ret;
-}
-
-/**
- * mongrp_reparent() - replace parent CTRL_MON group of a MON group
- * @rdtgrp:		the MON group whose parent should be replaced
- * @new_prdtgrp:	replacement parent CTRL_MON group for @rdtgrp
- * @cpus:		cpumask provided by the caller for use during this call
- *
- * Replaces the parent CTRL_MON group for a MON group, resulting in all member
- * tasks' CLOSID immediately changing to that of the new parent group.
- * Monitoring data for the group is unaffected by this operation.
- */
-static void mongrp_reparent(struct rdtgroup *rdtgrp,
-			    struct rdtgroup *new_prdtgrp,
-			    cpumask_var_t cpus)
-{
-	struct rdtgroup *prdtgrp = rdtgrp->mon.parent;
-
-	WARN_ON(rdtgrp->type != RDTMON_GROUP);
-	WARN_ON(new_prdtgrp->type != RDTCTRL_GROUP);
-
-	/* Nothing to do when simply renaming a MON group. */
-	if (prdtgrp == new_prdtgrp)
-		return;
-
-	WARN_ON(list_empty(&prdtgrp->mon.crdtgrp_list));
-	list_move_tail(&rdtgrp->mon.crdtgrp_list,
-		       &new_prdtgrp->mon.crdtgrp_list);
-
-	rdtgrp->mon.parent = new_prdtgrp;
-	rdtgrp->closid = new_prdtgrp->closid;
-
-	/* Propagate updated closid to all tasks in this group. */
-	rdt_move_group_tasks(rdtgrp, rdtgrp, cpus);
-
-	update_closid_rmid(cpus, NULL);
-}
-
-static int rdtgroup_rename(struct kernfs_node *kn,
-			   struct kernfs_node *new_parent, const char *new_name)
-{
-	struct rdtgroup *new_prdtgrp;
-	struct rdtgroup *rdtgrp;
-	cpumask_var_t tmpmask;
-	int ret;
-
-	rdtgrp = kernfs_to_rdtgroup(kn);
-	new_prdtgrp = kernfs_to_rdtgroup(new_parent);
-	if (!rdtgrp || !new_prdtgrp)
-		return -ENOENT;
-
-	/* Release both kernfs active_refs before obtaining rdtgroup mutex. */
-	rdtgroup_kn_get(rdtgrp, kn);
-	rdtgroup_kn_get(new_prdtgrp, new_parent);
-
-	mutex_lock(&rdtgroup_mutex);
-
-	rdt_last_cmd_clear();
-
-	/*
-	 * Don't allow kernfs_to_rdtgroup() to return a parent rdtgroup if
-	 * either kernfs_node is a file.
-	 */
-	if (kernfs_type(kn) != KERNFS_DIR ||
-	    kernfs_type(new_parent) != KERNFS_DIR) {
-		rdt_last_cmd_puts("Source and destination must be directories");
-		ret = -EPERM;
-		goto out;
-	}
-
-	if ((rdtgrp->flags & RDT_DELETED) || (new_prdtgrp->flags & RDT_DELETED)) {
-		ret = -ENOENT;
-		goto out;
-	}
-
-	if (rdtgrp->type != RDTMON_GROUP || !kn->parent ||
-	    !is_mon_groups(kn->parent, kn->name)) {
-		rdt_last_cmd_puts("Source must be a MON group\n");
-		ret = -EPERM;
-		goto out;
-	}
-
-	if (!is_mon_groups(new_parent, new_name)) {
-		rdt_last_cmd_puts("Destination must be a mon_groups subdirectory\n");
-		ret = -EPERM;
-		goto out;
-	}
-
-	/*
-	 * If the MON group is monitoring CPUs, the CPUs must be assigned to the
-	 * current parent CTRL_MON group and therefore cannot be assigned to
-	 * the new parent, making the move illegal.
-	 */
-	if (!cpumask_empty(&rdtgrp->cpu_mask) &&
-	    rdtgrp->mon.parent != new_prdtgrp) {
-		rdt_last_cmd_puts("Cannot move a MON group that monitors CPUs\n");
-		ret = -EPERM;
-		goto out;
-	}
-
-	/*
-	 * Allocate the cpumask for use in mongrp_reparent() to avoid the
-	 * possibility of failing to allocate it after kernfs_rename() has
-	 * succeeded.
-	 */
-	if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL)) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	/*
-	 * Perform all input validation and allocations needed to ensure
-	 * mongrp_reparent() will succeed before calling kernfs_rename(),
-	 * otherwise it would be necessary to revert this call if
-	 * mongrp_reparent() failed.
-	 */
-	ret = kernfs_rename(kn, new_parent, new_name);
-	if (!ret)
-		mongrp_reparent(rdtgrp, new_prdtgrp, tmpmask);
-
-	free_cpumask_var(tmpmask);
-
-out:
-	mutex_unlock(&rdtgroup_mutex);
-	rdtgroup_kn_put(rdtgrp, kn);
-	rdtgroup_kn_put(new_prdtgrp, new_parent);
-	return ret;
-}
-
-static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
-{
-	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3))
-		seq_puts(seq, ",cdp");
-
-	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2))
-		seq_puts(seq, ",cdpl2");
-
-	if (is_mba_sc(resctrl_arch_get_resource(RDT_RESOURCE_MBA)))
-		seq_puts(seq, ",mba_MBps");
-
-	if (resctrl_debug)
-		seq_puts(seq, ",debug");
-
-	return 0;
-}
-
-static struct kernfs_syscall_ops rdtgroup_kf_syscall_ops = {
-	.mkdir		= rdtgroup_mkdir,
-	.rmdir		= rdtgroup_rmdir,
-	.rename		= rdtgroup_rename,
-	.show_options	= rdtgroup_show_options,
-};
-
-static int rdtgroup_setup_root(struct rdt_fs_context *ctx)
-{
-	rdt_root = kernfs_create_root(&rdtgroup_kf_syscall_ops,
-				      KERNFS_ROOT_CREATE_DEACTIVATED |
-				      KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK,
-				      &rdtgroup_default);
-	if (IS_ERR(rdt_root))
-		return PTR_ERR(rdt_root);
-
-	ctx->kfc.root = rdt_root;
-	rdtgroup_default.kn = kernfs_root_to_node(rdt_root);
-
-	return 0;
-}
-
-static void rdtgroup_destroy_root(void)
-{
-	kernfs_destroy_root(rdt_root);
-	rdtgroup_default.kn = NULL;
-}
-
-static void rdtgroup_setup_default(void)
-{
-	mutex_lock(&rdtgroup_mutex);
-
-	rdtgroup_default.closid = RESCTRL_RESERVED_CLOSID;
-	rdtgroup_default.mon.rmid = RESCTRL_RESERVED_RMID;
-	rdtgroup_default.type = RDTCTRL_GROUP;
-	INIT_LIST_HEAD(&rdtgroup_default.mon.crdtgrp_list);
-
-	list_add(&rdtgroup_default.rdtgroup_list, &rdt_all_groups);
-
-	mutex_unlock(&rdtgroup_mutex);
-}
-
-static void domain_destroy_mon_state(struct rdt_domain *d)
-{
-	bitmap_free(d->rmid_busy_llc);
-	kfree(d->mbm_total);
-	kfree(d->mbm_local);
-}
-
-void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d)
-{
-	mutex_lock(&rdtgroup_mutex);
-
-	if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA)
-		mba_sc_domain_destroy(r, d);
-
-	if (!r->mon_capable)
-		goto out_unlock;
-
-	/*
-	 * If resctrl is mounted, remove all the
-	 * per domain monitor data directories.
-	 */
-	if (resctrl_mounted && resctrl_arch_mon_capable())
-		rmdir_mondata_subdir_allrdtgrp(r, d->id);
-
-	if (resctrl_is_mbm_enabled())
-		cancel_delayed_work(&d->mbm_over);
-	if (resctrl_arch_is_llc_occupancy_enabled() && has_busy_rmid(d)) {
-		/*
-		 * When a package is going down, forcefully
-		 * decrement rmid->ebusy. There is no way to know
-		 * that the L3 was flushed and hence may lead to
-		 * incorrect counts in rare scenarios, but leaving
-		 * the RMID as busy creates RMID leaks if the
-		 * package never comes back.
-		 */
-		__check_limbo(d, true);
-		cancel_delayed_work(&d->cqm_limbo);
-	}
-
-	domain_destroy_mon_state(d);
-
-out_unlock:
-	mutex_unlock(&rdtgroup_mutex);
-}
-
-static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
-{
-	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
-	size_t tsize;
-
-	if (resctrl_arch_is_llc_occupancy_enabled()) {
-		d->rmid_busy_llc = bitmap_zalloc(idx_limit, GFP_KERNEL);
-		if (!d->rmid_busy_llc)
-			return -ENOMEM;
-	}
-	if (resctrl_arch_is_mbm_total_enabled()) {
-		tsize = sizeof(*d->mbm_total);
-		d->mbm_total = kcalloc(idx_limit, tsize, GFP_KERNEL);
-		if (!d->mbm_total) {
-			bitmap_free(d->rmid_busy_llc);
-			return -ENOMEM;
-		}
-	}
-	if (resctrl_arch_is_mbm_local_enabled()) {
-		tsize = sizeof(*d->mbm_local);
-		d->mbm_local = kcalloc(idx_limit, tsize, GFP_KERNEL);
-		if (!d->mbm_local) {
-			bitmap_free(d->rmid_busy_llc);
-			kfree(d->mbm_total);
-			return -ENOMEM;
-		}
-	}
-
-	return 0;
-}
-
-int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d)
-{
-	int err = 0;
-
-	mutex_lock(&rdtgroup_mutex);
-
-	if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA) {
-		/* RDT_RESOURCE_MBA is never mon_capable */
-		err = mba_sc_domain_allocate(r, d);
-		goto out_unlock;
-	}
-
-	if (!r->mon_capable)
-		goto out_unlock;
-
-	err = domain_setup_mon_state(r, d);
-	if (err)
-		goto out_unlock;
-
-	if (resctrl_is_mbm_enabled()) {
-		INIT_DELAYED_WORK(&d->mbm_over, mbm_handle_overflow);
-		mbm_setup_overflow_handler(d, MBM_OVERFLOW_INTERVAL,
-					   RESCTRL_PICK_ANY_CPU);
-	}
-
-	if (resctrl_arch_is_llc_occupancy_enabled())
-		INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo);
-
-	/*
-	 * If the filesystem is not mounted then only the default resource group
-	 * exists. Creation of its directories is deferred until mount time
-	 * by rdt_get_tree() calling mkdir_mondata_all().
-	 * If resctrl is mounted, add per domain monitor data directories.
-	 */
-	if (resctrl_mounted && resctrl_arch_mon_capable())
-		mkdir_mondata_subdir_allrdtgrp(r, d);
-
-out_unlock:
-	mutex_unlock(&rdtgroup_mutex);
-
-	return err;
-}
-
-void resctrl_online_cpu(unsigned int cpu)
-{
-	mutex_lock(&rdtgroup_mutex);
-	/* The CPU is set in default rdtgroup after online. */
-	cpumask_set_cpu(cpu, &rdtgroup_default.cpu_mask);
-	mutex_unlock(&rdtgroup_mutex);
-}
-
-static void clear_childcpus(struct rdtgroup *r, unsigned int cpu)
-{
-	struct rdtgroup *cr;
-
-	list_for_each_entry(cr, &r->mon.crdtgrp_list, mon.crdtgrp_list) {
-		if (cpumask_test_and_clear_cpu(cpu, &cr->cpu_mask))
-			break;
-	}
-}
-
-void resctrl_offline_cpu(unsigned int cpu)
-{
-	struct rdt_resource *l3 = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	struct rdtgroup *rdtgrp;
-	struct rdt_domain *d;
-
-	mutex_lock(&rdtgroup_mutex);
-	list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
-		if (cpumask_test_and_clear_cpu(cpu, &rdtgrp->cpu_mask)) {
-			clear_childcpus(rdtgrp, cpu);
-			break;
-		}
-	}
-
-	if (!l3->mon_capable)
-		goto out_unlock;
-
-	d = resctrl_get_domain_from_cpu(cpu, l3);
-	if (d) {
-		if (resctrl_is_mbm_enabled() && cpu == d->mbm_work_cpu) {
-			cancel_delayed_work(&d->mbm_over);
-			mbm_setup_overflow_handler(d, 0, cpu);
-		}
-		if (resctrl_arch_is_llc_occupancy_enabled() &&
-		    cpu == d->cqm_work_cpu && has_busy_rmid(d)) {
-			cancel_delayed_work(&d->cqm_limbo);
-			cqm_setup_limbo_handler(d, 0, cpu);
-		}
-	}
-
-out_unlock:
-	mutex_unlock(&rdtgroup_mutex);
-}
-
-/*
- * resctrl_init - resctrl filesystem initialization
- *
- * Setup resctrl file system including set up root, create mount point,
- * register resctrl filesystem, and initialize files under root directory.
- *
- * Return: 0 on success or -errno
- */
-int resctrl_init(void)
-{
-	int ret = 0;
-
-	seq_buf_init(&last_cmd_status, last_cmd_status_buf,
-		     sizeof(last_cmd_status_buf));
-
-	rdtgroup_setup_default();
-
-	thread_throttle_mode_init();
-
-	ret = resctrl_mon_resource_init();
-	if (ret)
-		return ret;
-
-	ret = sysfs_create_mount_point(fs_kobj, "resctrl");
-	if (ret)
-		return ret;
-
-	ret = register_filesystem(&rdt_fs_type);
-	if (ret)
-		goto cleanup_mountpoint;
-
-	/*
-	 * Adding the resctrl debugfs directory here may not be ideal since
-	 * it would let the resctrl debugfs directory appear on the debugfs
-	 * filesystem before the resctrl filesystem is mounted.
-	 * It may also be ok since that would enable debugging of RDT before
-	 * resctrl is mounted.
-	 * The reason why the debugfs directory is created here and not in
-	 * rdt_get_tree() is because rdt_get_tree() takes rdtgroup_mutex and
-	 * during the debugfs directory creation also &sb->s_type->i_mutex_key
-	 * (the lockdep class of inode->i_rwsem). Other filesystem
-	 * interactions (eg. SyS_getdents) have the lock ordering:
-	 * &sb->s_type->i_mutex_key --> &mm->mmap_lock
-	 * During mmap(), called with &mm->mmap_lock, the rdtgroup_mutex
-	 * is taken, thus creating dependency:
-	 * &mm->mmap_lock --> rdtgroup_mutex for the latter that can cause
-	 * issues considering the other two lock dependencies.
-	 * By creating the debugfs directory here we avoid a dependency
-	 * that may cause deadlock (even though file operations cannot
-	 * occur until the filesystem is mounted, but I do not know how to
-	 * tell lockdep that).
-	 */
-	debugfs_resctrl = debugfs_create_dir("resctrl", NULL);
-
-	return 0;
-
-cleanup_mountpoint:
-	sysfs_remove_mount_point(fs_kobj, "resctrl");
-
-	return ret;
-}
-
-void resctrl_exit(void)
-{
-	debugfs_remove_recursive(debugfs_resctrl);
-	unregister_filesystem(&rdt_fs_type);
-	sysfs_remove_mount_point(fs_kobj, "resctrl");
-
-	resctrl_mon_resource_exit();
-}
-- 
Gitee


From c5784813082b0b823d01160f6805a34fcae6a3e9 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:16 -0800
Subject: [PATCH 127/280] anolis: Revert "x86/resctrl: Move the filesystem bits
 to headers visible to fs/resctrl"

ANBZ: #31045

This reverts commit 10882daf38a125ba19fac73b845603b7b2993226.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h         |  3 ---
 arch/x86/kernel/cpu/resctrl/core.c     |  5 ----
 arch/x86/kernel/cpu/resctrl/internal.h | 36 ++++++++++++++++++++++++++
 include/linux/resctrl.h                |  3 ---
 include/linux/resctrl_types.h          | 30 ---------------------
 5 files changed, 36 insertions(+), 41 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 746431c66fc4..491342f56811 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -218,9 +218,6 @@ int resctrl_arch_measure_l2_residency(void *_plr);
 int resctrl_arch_measure_l3_residency(void *_plr);
 void resctrl_cpu_detect(struct cpuinfo_x86 *c);
 
-bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l);
-int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
-
 #else
 
 static inline void resctrl_arch_sched_in(struct task_struct *tsk) {}
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 87cd508588e5..948b4d409cd9 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -306,11 +306,6 @@ static void rdt_get_cdp_l2_config(void)
 	rdt_get_cdp_config(RDT_RESOURCE_L2);
 }
 
-bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l)
-{
-	return rdt_resources_all[l].cdp_enabled;
-}
-
 static void
 mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
 {
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 0f7e3f10941b..56218193a8ba 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -15,6 +15,12 @@
 
 #define L2_QOS_CDP_ENABLE		0x01ULL
 
+#define CQM_LIMBOCHECK_INTERVAL	1000
+
+#define MBM_CNTR_WIDTH_BASE		24
+#define MBM_OVERFLOW_INTERVAL		1000
+#define MAX_MBA_BW			100u
+#define MBA_IS_LINEAR			0x4
 #define MBM_CNTR_WIDTH_OFFSET_AMD	20
 
 #define RMID_VAL_ERROR			BIT_ULL(63)
@@ -204,6 +210,29 @@ struct rdtgroup {
 	struct pseudo_lock_region	*plr;
 };
 
+/* rdtgroup.flags */
+#define	RDT_DELETED		1
+
+/* rftype.flags */
+#define RFTYPE_FLAGS_CPUS_LIST	1
+
+/*
+ * Define the file type flags for base and info directories.
+ */
+#define RFTYPE_INFO			BIT(0)
+#define RFTYPE_BASE			BIT(1)
+#define RFTYPE_CTRL			BIT(4)
+#define RFTYPE_MON			BIT(5)
+#define RFTYPE_TOP			BIT(6)
+#define RFTYPE_RES_CACHE		BIT(8)
+#define RFTYPE_RES_MB			BIT(9)
+#define RFTYPE_DEBUG			BIT(10)
+#define RFTYPE_CTRL_INFO		(RFTYPE_INFO | RFTYPE_CTRL)
+#define RFTYPE_MON_INFO			(RFTYPE_INFO | RFTYPE_MON)
+#define RFTYPE_TOP_INFO			(RFTYPE_INFO | RFTYPE_TOP)
+#define RFTYPE_CTRL_BASE		(RFTYPE_BASE | RFTYPE_CTRL)
+#define RFTYPE_MON_BASE			(RFTYPE_BASE | RFTYPE_MON)
+
 /* List of all resource groups */
 extern struct list_head rdt_all_groups;
 
@@ -341,6 +370,13 @@ static inline struct rdt_resource *resctrl_inc(struct rdt_resource *res)
 	return &hw_res->r_resctrl;
 }
 
+static inline bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l)
+{
+	return rdt_resources_all[l].cdp_enabled;
+}
+
+int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
+
 /*
  * To return the common struct rdt_resource, which is contained in struct
  * rdt_hw_resource, walk the resctrl member of struct rdt_hw_resource.
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 00cc0457af50..f786ffceeda3 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -41,9 +41,6 @@ int proc_resctrl_show(struct seq_file *m,
  */
 #define RESCTRL_MAX_CBM			32
 
-extern unsigned int resctrl_rmid_realloc_limit;
-extern unsigned int resctrl_rmid_realloc_threshold;
-
 /**
  * struct pseudo_lock_region - pseudo-lock region information
  * @s:			Resctrl schema for the resource to which this
diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h
index fe0b10b589c0..4788bd95dac6 100644
--- a/include/linux/resctrl_types.h
+++ b/include/linux/resctrl_types.h
@@ -7,36 +7,6 @@
 #ifndef __LINUX_RESCTRL_TYPES_H
 #define __LINUX_RESCTRL_TYPES_H
 
-#define CQM_LIMBOCHECK_INTERVAL	1000
-
-#define MBM_CNTR_WIDTH_BASE		24
-#define MBM_OVERFLOW_INTERVAL		1000
-#define MAX_MBA_BW			100u
-#define MBA_IS_LINEAR			0x4
-
-/* rdtgroup.flags */
-#define	RDT_DELETED		1
-
-/* rftype.flags */
-#define RFTYPE_FLAGS_CPUS_LIST	1
-
-/*
- * Define the file type flags for base and info directories.
- */
-#define RFTYPE_INFO			BIT(0)
-#define RFTYPE_BASE			BIT(1)
-#define RFTYPE_CTRL			BIT(4)
-#define RFTYPE_MON			BIT(5)
-#define RFTYPE_TOP			BIT(6)
-#define RFTYPE_RES_CACHE		BIT(8)
-#define RFTYPE_RES_MB			BIT(9)
-#define RFTYPE_DEBUG			BIT(10)
-#define RFTYPE_CTRL_INFO		(RFTYPE_INFO | RFTYPE_CTRL)
-#define RFTYPE_MON_INFO			(RFTYPE_INFO | RFTYPE_MON)
-#define RFTYPE_TOP_INFO			(RFTYPE_INFO | RFTYPE_TOP)
-#define RFTYPE_CTRL_BASE		(RFTYPE_BASE | RFTYPE_CTRL)
-#define RFTYPE_MON_BASE			(RFTYPE_BASE | RFTYPE_MON)
-
 /* Reads to Local DRAM Memory */
 #define READS_TO_LOCAL_MEM		BIT(0)
 
-- 
Gitee


From d59640acf219525f36166e2d3cb6724311ec9ad0 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:16 -0800
Subject: [PATCH 128/280] anolis: Revert "fs/resctrl: Add boiler plate for
 external resctrl code"

ANBZ: #31045

This reverts commit cb1246ff7714e6460d3c237168ee204e31bc4737.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 MAINTAINERS              |  1 -
 arch/Kconfig             |  8 --------
 arch/x86/Kconfig         | 10 +++++++---
 fs/Kconfig               |  1 -
 fs/Makefile              |  1 -
 fs/resctrl/Kconfig       | 23 -----------------------
 fs/resctrl/Makefile      |  3 ---
 fs/resctrl/ctrlmondata.c |  0
 fs/resctrl/internal.h    |  0
 fs/resctrl/monitor.c     |  0
 fs/resctrl/psuedo_lock.c |  0
 fs/resctrl/rdtgroup.c    |  0
 include/linux/resctrl.h  |  4 ----
 13 files changed, 7 insertions(+), 44 deletions(-)
 delete mode 100644 fs/resctrl/Kconfig
 delete mode 100644 fs/resctrl/Makefile
 delete mode 100644 fs/resctrl/ctrlmondata.c
 delete mode 100644 fs/resctrl/internal.h
 delete mode 100644 fs/resctrl/monitor.c
 delete mode 100644 fs/resctrl/psuedo_lock.c
 delete mode 100644 fs/resctrl/rdtgroup.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 2def3d5f43b3..cde0fe482aae 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18204,7 +18204,6 @@ S:	Supported
 F:	Documentation/arch/x86/resctrl*
 F:	arch/x86/include/asm/resctrl.h
 F:	arch/x86/kernel/cpu/resctrl/
-F:	fs/resctrl/
 F:	include/linux/resctrl*.h
 F:	tools/testing/selftests/resctrl/
 
diff --git a/arch/Kconfig b/arch/Kconfig
index b2ccbaa3780e..ad97c9f158e0 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1341,14 +1341,6 @@ config STRICT_MODULE_RWX
 config ARCH_HAS_PHYS_TO_DMA
 	bool
 
-config ARCH_HAS_CPU_RESCTRL
-	bool
-	help
-	  The 'resctrl' filesystem allows CPU controls of shared resources
-	  such as caches and memory bandwidth to be configured. An architecture
-	  selects this if it provides the arch-specific hooks for the filesystem
-	  and needs the per-task CLOSID/RMID properties.
-
 config HAVE_ARCH_COMPILER_H
 	bool
 	help
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index cc84cef105cf..ac2e95c097c3 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -492,10 +492,8 @@ config GOLDFISH
 config X86_CPU_RESCTRL
 	bool "x86 CPU resource control support"
 	depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD)
-	depends on MISC_FILESYSTEMS
 	select KERNFS
-	select ARCH_HAS_CPU_RESCTRL
-	select RESCTRL_FS
+	select PROC_CPU_RESCTRL		if PROC_FS
 	select RESCTRL_FS_PSEUDO_LOCK
 	help
 	  Enable x86 CPU resource control support.
@@ -513,6 +511,12 @@ config X86_CPU_RESCTRL
 
 	  Say N if unsure.
 
+config RESCTRL_FS_PSEUDO_LOCK
+	bool
+	help
+	  Software mechanism to pin data in a cache portion using
+	  micro-architecture specific knowledge.
+
 if X86_32
 config X86_BIGSMP
 	bool "Support for big SMP systems with more than 8 CPUs"
diff --git a/fs/Kconfig b/fs/Kconfig
index 32d4f37da0d6..c7090d46e7d6 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -332,7 +332,6 @@ source "fs/omfs/Kconfig"
 source "fs/hpfs/Kconfig"
 source "fs/qnx4/Kconfig"
 source "fs/qnx6/Kconfig"
-source "fs/resctrl/Kconfig"
 source "fs/romfs/Kconfig"
 source "fs/pstore/Kconfig"
 source "fs/sysv/Kconfig"
diff --git a/fs/Makefile b/fs/Makefile
index b62375770dee..f9541f40be4e 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -129,4 +129,3 @@ obj-$(CONFIG_EFIVAR_FS)		+= efivarfs/
 obj-$(CONFIG_EROFS_FS)		+= erofs/
 obj-$(CONFIG_VBOXSF_FS)		+= vboxsf/
 obj-$(CONFIG_ZONEFS_FS)		+= zonefs/
-obj-$(CONFIG_RESCTRL_FS)	+= resctrl/
diff --git a/fs/resctrl/Kconfig b/fs/resctrl/Kconfig
deleted file mode 100644
index 36a1ddbe6c21..000000000000
--- a/fs/resctrl/Kconfig
+++ /dev/null
@@ -1,23 +0,0 @@
-config RESCTRL_FS
-	bool "CPU Resource Control Filesystem (resctrl)"
-	depends on ARCH_HAS_CPU_RESCTRL
-	select KERNFS
-	select PROC_CPU_RESCTRL               if PROC_FS
-	help
-	  Resctrl is a filesystem interface
-	  to control allocation and
-	  monitoring of system resources
-	  used by the CPUs.
-
-config RESCTRL_FS_PSEUDO_LOCK
-	bool
-	help
-          Software mechanism to pin data in a cache portion using
-          micro-architecture specific knowledge.
-
-config RESCTRL_RMID_DEPENDS_ON_CLOSID
-	bool
-	help
-	  Enable by the architecture when the RMID values depend on the CLOSID.
-	  This causes the closid allocator to search for CLOSID with clean
-	  RMID.
diff --git a/fs/resctrl/Makefile b/fs/resctrl/Makefile
deleted file mode 100644
index 10fcfb0fdb10..000000000000
--- a/fs/resctrl/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_RESCTRL_FS)		+= rdtgroup.o ctrlmondata.o monitor.o
-obj-$(CONFIG_RESCTRL_FS_PSEUDO_LOCK)	+= psuedo_lock.o
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
deleted file mode 100644
index e69de29bb2d1..000000000000
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
deleted file mode 100644
index e69de29bb2d1..000000000000
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
deleted file mode 100644
index e69de29bb2d1..000000000000
diff --git a/fs/resctrl/psuedo_lock.c b/fs/resctrl/psuedo_lock.c
deleted file mode 100644
index e69de29bb2d1..000000000000
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
deleted file mode 100644
index e69de29bb2d1..000000000000
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index f786ffceeda3..5da55e58f229 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -8,10 +8,6 @@
 #include <linux/pid.h>
 #include <linux/resctrl_types.h>
 
-#ifdef CONFIG_ARCH_HAS_CPU_RESCTRL
-#include <asm/resctrl.h>
-#endif
-
 /* CLOSID, RMID value used by the default control group */
 #define RESCTRL_RESERVED_CLOSID		0
 #define RESCTRL_RESERVED_RMID		0
-- 
Gitee


From e6e1ffb6dc436f8e03306d50bdf61102ff77e0b2 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:16 -0800
Subject: [PATCH 129/280] anolis: Revert "x86/resctrl: Drop __init/__exit on
 assorted symbols"

ANBZ: #31045

This reverts commit 63f229916df9dba486b09df0d2fc7ac2c10b8199.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h | 2 +-
 arch/x86/kernel/cpu/resctrl/monitor.c  | 4 ++--
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 8 ++++----
 include/linux/resctrl.h                | 4 ++--
 4 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 56218193a8ba..3a3962736061 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -457,7 +457,7 @@ void closid_free(int closid);
 int alloc_rmid(u32 closid);
 void free_rmid(u32 closid, u32 rmid);
 int rdt_get_mon_l3_config(struct rdt_resource *r);
-void resctrl_mon_resource_exit(void);
+void __exit resctrl_mon_resource_exit(void);
 bool rdt_cpu_has(int flag);
 void mon_event_count(void *info);
 int rdtgroup_mondata_show(struct seq_file *m, void *arg);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 7e6fca138cb7..8b316d9acc3b 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -954,7 +954,7 @@ static int dom_data_init(struct rdt_resource *r)
 	return err;
 }
 
-static void dom_data_exit(struct rdt_resource *r)
+static void __exit dom_data_exit(struct rdt_resource *r)
 {
 	if (!r->mon_capable)
 		return;
@@ -1076,7 +1076,7 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 	return 0;
 }
 
-void resctrl_mon_resource_exit(void)
+void __exit resctrl_mon_resource_exit(void)
 {
 	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
 
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 1425a33d201d..218aebd6387f 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2069,7 +2069,7 @@ static struct rftype *rdtgroup_get_rftype_by_name(const char *name)
 	return NULL;
 }
 
-static void thread_throttle_mode_init(void)
+static void __init thread_throttle_mode_init(void)
 {
 	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
 	struct rftype *rft;
@@ -3997,7 +3997,7 @@ static void rdtgroup_destroy_root(void)
 	rdtgroup_default.kn = NULL;
 }
 
-static void rdtgroup_setup_default(void)
+static void __init rdtgroup_setup_default(void)
 {
 	mutex_lock(&rdtgroup_mutex);
 
@@ -4190,7 +4190,7 @@ void resctrl_offline_cpu(unsigned int cpu)
  *
  * Return: 0 on success or -errno
  */
-int resctrl_init(void)
+int __init resctrl_init(void)
 {
 	int ret = 0;
 
@@ -4244,7 +4244,7 @@ int resctrl_init(void)
 	return ret;
 }
 
-void resctrl_exit(void)
+void __exit resctrl_exit(void)
 {
 	debugfs_remove_recursive(debugfs_resctrl);
 	unregister_filesystem(&rdt_fs_type);
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 5da55e58f229..f463fb949677 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -393,7 +393,7 @@ void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_domain *d);
 extern unsigned int resctrl_rmid_realloc_threshold;
 extern unsigned int resctrl_rmid_realloc_limit;
 
-int resctrl_init(void);
-void resctrl_exit(void);
+int __init resctrl_init(void);
+void __exit resctrl_exit(void);
 
 #endif /* _RESCTRL_H */
-- 
Gitee


From 66338e54d2c59647bbd7970bd5d5129f7387c759 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:16 -0800
Subject: [PATCH 130/280] anolis: Revert "x86/resctrl: Rename
 resctrl_sched_in() to begin resctrl_arch_"

ANBZ: #31045

This reverts commit e029a786d38c46e82e97761f1a8d73bc4220d309.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h         |  4 ++--
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 12 ++++++------
 arch/x86/kernel/process_32.c           |  2 +-
 arch/x86/kernel/process_64.c           |  2 +-
 4 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 491342f56811..9940398e367e 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -177,7 +177,7 @@ static inline bool resctrl_arch_match_rmid(struct task_struct *tsk, u32 ignored,
 	return READ_ONCE(tsk->rmid) == rmid;
 }
 
-static inline void resctrl_arch_sched_in(struct task_struct *tsk)
+static inline void resctrl_sched_in(struct task_struct *tsk)
 {
 	if (static_branch_likely(&rdt_enable_key))
 		__resctrl_sched_in(tsk);
@@ -220,7 +220,7 @@ void resctrl_cpu_detect(struct cpuinfo_x86 *c);
 
 #else
 
-static inline void resctrl_arch_sched_in(struct task_struct *tsk) {}
+static inline void resctrl_sched_in(struct task_struct *tsk) {}
 static inline void resctrl_cpu_detect(struct cpuinfo_x86 *c) {}
 
 #endif /* CONFIG_X86_CPU_RESCTRL */
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 218aebd6387f..085fb9c2333a 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -359,7 +359,7 @@ static int rdtgroup_cpus_show(struct kernfs_open_file *of,
 }
 
 /*
- * This is safe against resctrl_arch_sched_in() called from __switch_to()
+ * This is safe against resctrl_sched_in() called from __switch_to()
  * because __switch_to() is executed with interrupts disabled. A local call
  * from update_closid_rmid() is protected against __switch_to() because
  * preemption is disabled.
@@ -378,7 +378,7 @@ void resctrl_arch_sync_cpu_defaults(void *info)
 	 * executing task might have its own closid selected. Just reuse
 	 * the context switch code.
 	 */
-	resctrl_arch_sched_in(current);
+	resctrl_sched_in(current);
 }
 
 /*
@@ -605,7 +605,7 @@ static void _update_task_closid_rmid(void *task)
 	 * Otherwise, the MSR is updated when the task is scheduled in.
 	 */
 	if (task == current)
-		resctrl_arch_sched_in(task);
+		resctrl_sched_in(task);
 }
 
 static void update_task_closid_rmid(struct task_struct *t)
@@ -663,7 +663,7 @@ static int __rdtgroup_move_task(struct task_struct *tsk,
 	 * Ensure the task's closid and rmid are written before determining if
 	 * the task is current that will decide if it will be interrupted.
 	 * This pairs with the full barrier between the rq->curr update and
-	 * resctrl_arch_sched_in() during context switch.
+	 * resctrl_sched_in() during context switch.
 	 */
 	smp_mb();
 
@@ -2946,8 +2946,8 @@ static void rdt_move_group_tasks(struct rdtgroup *from, struct rdtgroup *to,
 			/*
 			 * Order the closid/rmid stores above before the loads
 			 * in task_curr(). This pairs with the full barrier
-			 * between the rq->curr update and
-			 * resctrl_arch_sched_in() during context switch.
+			 * between the rq->curr update and resctrl_sched_in()
+			 * during context switch.
 			 */
 			smp_mb();
 
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 619560eb9f94..708c87b88cc1 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -212,7 +212,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
 	switch_fpu_finish();
 
 	/* Load the Intel cache allocation PQR MSR. */
-	resctrl_arch_sched_in(next_p);
+	resctrl_sched_in(next_p);
 
 	return prev_p;
 }
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index fbadfa84a02d..5fee1e0c42ca 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -667,7 +667,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
 	}
 
 	/* Load the Intel cache allocation PQR MSR. */
-	resctrl_arch_sched_in(next_p);
+	resctrl_sched_in(next_p);
 
 	return prev_p;
 }
-- 
Gitee


From b2497a9d6756915a759725846f063b30f56a24a9 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:16 -0800
Subject: [PATCH 131/280] anolis: Revert "x86/resctrl: Describe resctrl's
 bitmap size assumptions"

ANBZ: #31045

This reverts commit 716a62ea17c67137417bff48aabac6d604ac3fd0.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/resctrl.h | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index f463fb949677..84420253dc05 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -26,17 +26,6 @@ int proc_resctrl_show(struct seq_file *m,
 /* max value for struct rdt_domain's mbps_val */
 #define MBA_MAX_MBPS   U32_MAX
 
-/*
- * Resctrl uses a u32 as a closid bitmap. The maximum closid is 32.
- */
-#define RESCTRL_MAX_CLOSID		32
-
-/*
- * Resctrl uses u32 to hold the user-space config. The maximum bitmap size is
- * 32.
- */
-#define RESCTRL_MAX_CBM			32
-
 /**
  * struct pseudo_lock_region - pseudo-lock region information
  * @s:			Resctrl schema for the resource to which this
-- 
Gitee


From 69525dae7aeaa33faeb7cd18e49106753ec5f6ea Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:16 -0800
Subject: [PATCH 132/280] anolis: Revert "x86/resctrl: Claim
 get_domain_from_cpu() for resctrl"

ANBZ: #31045

This reverts commit 37f40a165c75ef29f37bf83602f8a4bd5b887215.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     | 15 ++++++++++++++-
 arch/x86/kernel/cpu/resctrl/internal.h |  1 +
 arch/x86/kernel/cpu/resctrl/monitor.c  |  2 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |  2 +-
 include/linux/resctrl.h                | 19 -------------------
 5 files changed, 17 insertions(+), 22 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 948b4d409cd9..1aa6f8244cd1 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -355,6 +355,19 @@ cat_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
 		wrmsrl(hw_res->msr_base + i, hw_dom->ctrl_val[i]);
 }
 
+struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r)
+{
+	struct rdt_domain *d;
+
+	list_for_each_entry(d, &r->domains, list) {
+		/* Find the domain that contains this CPU */
+		if (cpumask_test_cpu(cpu, &d->cpu_mask))
+			return d;
+	}
+
+	return NULL;
+}
+
 u32 resctrl_arch_get_num_closid(struct rdt_resource *r)
 {
 	return resctrl_to_arch_res(r)->num_closid;
@@ -368,7 +381,7 @@ void rdt_ctrl_update(void *arg)
 	int cpu = smp_processor_id();
 	struct rdt_domain *d;
 
-	d = resctrl_get_domain_from_cpu(cpu, r);
+	d = get_domain_from_cpu(cpu, r);
 	if (d) {
 		hw_res->msr_update(d, m, r);
 		return;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 3a3962736061..e849d4407769 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -452,6 +452,7 @@ unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_domain *d,
 				  unsigned long cbm);
 enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
 int rdtgroup_tasks_assigned(struct rdtgroup *r);
+struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r);
 int closids_supported(void);
 void closid_free(int closid);
 int alloc_rmid(u32 closid);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 8b316d9acc3b..287fb0a5f060 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -676,7 +676,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
 	idx = resctrl_arch_rmid_idx_encode(closid, rmid);
 	pmbm_data = &dom_mbm->mbm_local[idx];
 
-	dom_mba = resctrl_get_domain_from_cpu(smp_processor_id(), r_mba);
+	dom_mba = get_domain_from_cpu(smp_processor_id(), r_mba);
 	if (!dom_mba) {
 		pr_warn_once("Failure to get domain for MBA update\n");
 		return;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 085fb9c2333a..702a94fad6db 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4165,7 +4165,7 @@ void resctrl_offline_cpu(unsigned int cpu)
 	if (!l3->mon_capable)
 		goto out_unlock;
 
-	d = resctrl_get_domain_from_cpu(cpu, l3);
+	d = get_domain_from_cpu(cpu, l3);
 	if (d) {
 		if (resctrl_is_mbm_enabled() && cpu == d->mbm_work_cpu) {
 			cancel_delayed_work(&d->mbm_over);
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 84420253dc05..73c111963433 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -2,7 +2,6 @@
 #ifndef _RESCTRL_H
 #define _RESCTRL_H
 
-#include <linux/cpu.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/pid.h>
@@ -274,24 +273,6 @@ static inline u32 resctrl_get_config_index(u32 closid,
 	}
 }
 
-/*
- * Caller must hold the cpuhp read lock to prevent the struct rdt_domain being
- * freed.
- */
-static inline struct rdt_domain *
-resctrl_get_domain_from_cpu(int cpu, struct rdt_resource *r)
-{
-	struct rdt_domain *d;
-
-	list_for_each_entry_rcu(d, &r->domains, list) {
-		/* Find the domain that contains this CPU */
-		if (cpumask_test_cpu(cpu, &d->cpu_mask))
-			return d;
-	}
-
-	return NULL;
-}
-
 /*
  * Update the ctrl_val and apply this config right now.
  * Must be called on one of the domain's CPUs.
-- 
Gitee


From 00966439cba9977604273045ffaf981bf0ba21ca Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:16 -0800
Subject: [PATCH 133/280] anolis: Revert "x86/resctrl: Move get_config_index()
 to a header"

ANBZ: #31045

This reverts commit 054a6ee7fd7c867564c6a3957fbb29e238bfeef4.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 19 ++++++++++++++++---
 include/linux/resctrl.h                   | 15 ---------------
 2 files changed, 16 insertions(+), 18 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 4d91a8abb24d..ad9e5516e607 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -282,6 +282,19 @@ static int parse_line(char *line, struct resctrl_schema *s,
 	return -EINVAL;
 }
 
+static u32 get_config_index(u32 closid, enum resctrl_conf_type type)
+{
+	switch (type) {
+	default:
+	case CDP_NONE:
+		return closid;
+	case CDP_CODE:
+		return closid * 2 + 1;
+	case CDP_DATA:
+		return closid * 2;
+	}
+}
+
 static bool apply_config(struct rdt_hw_domain *hw_dom,
 			 struct resctrl_staged_config *cfg, u32 idx,
 			 cpumask_var_t cpu_mask)
@@ -303,7 +316,7 @@ int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
-	u32 idx = resctrl_get_config_index(closid, t);
+	u32 idx = get_config_index(closid, t);
 	struct msr_param msr_param;
 
 	if (!cpumask_test_cpu(smp_processor_id(), &d->cpu_mask))
@@ -343,7 +356,7 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 			if (!cfg->have_new_ctrl)
 				continue;
 
-			idx = resctrl_get_config_index(closid, t);
+			idx = get_config_index(closid, t);
 			if (!apply_config(hw_dom, cfg, idx, cpu_mask))
 				continue;
 
@@ -468,7 +481,7 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
 			    u32 closid, enum resctrl_conf_type type)
 {
 	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
-	u32 idx = resctrl_get_config_index(closid, type);
+	u32 idx = get_config_index(closid, type);
 
 	return hw_dom->ctrl_val[idx];
 }
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 73c111963433..3de5bc63ace0 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -258,21 +258,6 @@ bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt);
 void resctrl_arch_mon_event_config_write(void *info);
 void resctrl_arch_mon_event_config_read(void *info);
 
-/* For use by arch code to remap resctrl's smaller CDP CLOSID range */
-static inline u32 resctrl_get_config_index(u32 closid,
-					   enum resctrl_conf_type type)
-{
-	switch (type) {
-	default:
-	case CDP_NONE:
-		return closid;
-	case CDP_CODE:
-			return (closid * 2) + 1;
-	case CDP_DATA:
-			return (closid * 2);
-	}
-}
-
 /*
  * Update the ctrl_val and apply this config right now.
  * Must be called on one of the domain's CPUs.
-- 
Gitee


From 8ba0068e6411ecb5a04152476d1293afb3b7109c Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:16 -0800
Subject: [PATCH 134/280] anolis: Revert "x86/resctrl: Move
 thread_throttle_mode_init() to be managed by resctrl"

ANBZ: #31045

This reverts commit 946f4fbe455b8e056f2b43df2f5e7687a161a4c9.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     | 1 +
 arch/x86/kernel/cpu/resctrl/internal.h | 1 +
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 9 +--------
 3 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 1aa6f8244cd1..a320e3d1c2c9 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -227,6 +227,7 @@ static __init bool __get_mem_config_intel(struct rdt_resource *r)
 		r->membw.throttle_mode = THREAD_THROTTLE_PER_THREAD;
 	else
 		r->membw.throttle_mode = THREAD_THROTTLE_MAX;
+	thread_throttle_mode_init();
 
 	r->alloc_capable = true;
 
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index e849d4407769..be4e8f31b127 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -478,6 +478,7 @@ void cqm_handle_limbo(struct work_struct *work);
 bool has_busy_rmid(struct rdt_domain *d);
 void __check_limbo(struct rdt_domain *d, bool force_free);
 void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
+void __init thread_throttle_mode_init(void);
 void mbm_config_rftype_init(const char *config);
 void rdt_staged_configs_clear(void);
 bool closid_allocated(unsigned int closid);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 702a94fad6db..9275d6f8a74e 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2069,15 +2069,10 @@ static struct rftype *rdtgroup_get_rftype_by_name(const char *name)
 	return NULL;
 }
 
-static void __init thread_throttle_mode_init(void)
+void __init thread_throttle_mode_init(void)
 {
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
 	struct rftype *rft;
 
-	if (!r->alloc_capable ||
-	    r->membw.throttle_mode == THREAD_THROTTLE_UNDEFINED)
-		return;
-
 	rft = rdtgroup_get_rftype_by_name("thread_throttle_mode");
 	if (!rft)
 		return;
@@ -4199,8 +4194,6 @@ int __init resctrl_init(void)
 
 	rdtgroup_setup_default();
 
-	thread_throttle_mode_init();
-
 	ret = resctrl_mon_resource_init();
 	if (ret)
 		return ret;
-- 
Gitee


From 46108f54277d358f68aea6838dd0528e79bce353 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 135/280] anolis: Revert "x86/resctrl: Make
 resctrl_arch_pseudo_lock_fn() take a plr"

ANBZ: #31045

This reverts commit 9285fdfd2679a6dc79de41b905efc5781a1ed07c.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h            |  2 +-
 arch/x86/kernel/cpu/resctrl/internal.h    | 37 +++++++++++++++++++++
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 13 ++++----
 include/linux/resctrl.h                   | 39 -----------------------
 4 files changed, 44 insertions(+), 47 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 9940398e367e..a88af68f9fe2 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -212,7 +212,7 @@ static inline void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid,
 					     void *ctx) { };
 
 u64 resctrl_arch_get_prefetch_disable_bits(void);
-int resctrl_arch_pseudo_lock_fn(void *_plr);
+int resctrl_arch_pseudo_lock_fn(void *_rdtgrp);
 int resctrl_arch_measure_cycles_lat_fn(void *_plr);
 int resctrl_arch_measure_l2_residency(void *_plr);
 int resctrl_arch_measure_l3_residency(void *_plr);
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index be4e8f31b127..d6db15839dc4 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -182,6 +182,43 @@ struct mongroup {
 	u32			rmid;
 };
 
+/**
+ * struct pseudo_lock_region - pseudo-lock region information
+ * @s:			Resctrl schema for the resource to which this
+ *			pseudo-locked region belongs
+ * @d:			RDT domain to which this pseudo-locked region
+ *			belongs
+ * @cbm:		bitmask of the pseudo-locked region
+ * @lock_thread_wq:	waitqueue used to wait on the pseudo-locking thread
+ *			completion
+ * @thread_done:	variable used by waitqueue to test if pseudo-locking
+ *			thread completed
+ * @cpu:		core associated with the cache on which the setup code
+ *			will be run
+ * @line_size:		size of the cache lines
+ * @size:		size of pseudo-locked region in bytes
+ * @kmem:		the kernel memory associated with pseudo-locked region
+ * @minor:		minor number of character device associated with this
+ *			region
+ * @debugfs_dir:	pointer to this region's directory in the debugfs
+ *			filesystem
+ * @pm_reqs:		Power management QoS requests related to this region
+ */
+struct pseudo_lock_region {
+	struct resctrl_schema	*s;
+	struct rdt_domain	*d;
+	u32			cbm;
+	wait_queue_head_t	lock_thread_wq;
+	int			thread_done;
+	int			cpu;
+	unsigned int		line_size;
+	unsigned int		size;
+	void			*kmem;
+	unsigned int		minor;
+	struct dentry		*debugfs_dir;
+	struct list_head	pm_reqs;
+};
+
 /**
  * struct rdtgroup - store rdtgroup's data in resctrl file system.
  * @kn:				kernfs node
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index ba51ab1f70e6..5a66e3b2c2ea 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -416,7 +416,7 @@ static void pseudo_lock_free(struct rdtgroup *rdtgrp)
 
 /**
  * resctrl_arch_pseudo_lock_fn - Load kernel memory into cache
- * @_plr: the pseudo-lock region descriptor
+ * @_rdtgrp: resource group to which pseudo-lock region belongs
  *
  * This is the core pseudo-locking flow.
  *
@@ -433,9 +433,10 @@ static void pseudo_lock_free(struct rdtgroup *rdtgrp)
  *
  * Return: 0. Waiter on waitqueue will be woken on completion.
  */
-int resctrl_arch_pseudo_lock_fn(void *_plr)
+int resctrl_arch_pseudo_lock_fn(void *_rdtgrp)
 {
-	struct pseudo_lock_region *plr = _plr;
+	struct rdtgroup *rdtgrp = _rdtgrp;
+	struct pseudo_lock_region *plr = rdtgrp->plr;
 	u32 rmid_p, closid_p;
 	unsigned long i;
 	u64 saved_msr;
@@ -495,8 +496,7 @@ int resctrl_arch_pseudo_lock_fn(void *_plr)
 	 * pseudo-locked followed by reading of kernel memory to load it
 	 * into the cache.
 	 */
-	__wrmsr(MSR_IA32_PQR_ASSOC, rmid_p, plr->closid);
-
+	__wrmsr(MSR_IA32_PQR_ASSOC, rmid_p, rdtgrp->closid);
 	/*
 	 * Cache was flushed earlier. Now access kernel memory to read it
 	 * into cache region associated with just activated plr->closid.
@@ -1327,8 +1327,7 @@ int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
 
 	plr->thread_done = 0;
 
-	plr->closid = rdtgrp->closid;
-	thread = kthread_create_on_node(resctrl_arch_pseudo_lock_fn, plr,
+	thread = kthread_create_on_node(resctrl_arch_pseudo_lock_fn, rdtgrp,
 					cpu_to_node(plr->cpu),
 					"pseudo_lock/%u", plr->cpu);
 	if (IS_ERR(thread)) {
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 3de5bc63ace0..6705d7960dfd 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -25,45 +25,6 @@ int proc_resctrl_show(struct seq_file *m,
 /* max value for struct rdt_domain's mbps_val */
 #define MBA_MAX_MBPS   U32_MAX
 
-/**
- * struct pseudo_lock_region - pseudo-lock region information
- * @s:			Resctrl schema for the resource to which this
- *			pseudo-locked region belongs
- * @closid:		The closid that this pseudo-locked region uses
- * @d:			RDT domain to which this pseudo-locked region
- *			belongs
- * @cbm:		bitmask of the pseudo-locked region
- * @lock_thread_wq:	waitqueue used to wait on the pseudo-locking thread
- *			completion
- * @thread_done:	variable used by waitqueue to test if pseudo-locking
- *			thread completed
- * @cpu:		core associated with the cache on which the setup code
- *			will be run
- * @line_size:		size of the cache lines
- * @size:		size of pseudo-locked region in bytes
- * @kmem:		the kernel memory associated with pseudo-locked region
- * @minor:		minor number of character device associated with this
- *			region
- * @debugfs_dir:	pointer to this region's directory in the debugfs
- *			filesystem
- * @pm_reqs:		Power management QoS requests related to this region
- */
-struct pseudo_lock_region {
-	struct resctrl_schema	*s;
-	u32			closid;
-	struct rdt_domain	*d;
-	u32			cbm;
-	wait_queue_head_t	lock_thread_wq;
-	int			thread_done;
-	int			cpu;
-	unsigned int		line_size;
-	unsigned int		size;
-	void			*kmem;
-	unsigned int		minor;
-	struct dentry		*debugfs_dir;
-	struct list_head	pm_reqs;
-};
-
 /**
  * struct resctrl_staged_config - parsed configuration to be applied
  * @new_ctrl:		new ctrl value to be loaded
-- 
Gitee


From b919e217c454d63d78aaba5aabd67237a0912a4c Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 136/280] anolis: Revert "x86/resctrl: Make
 prefetch_disable_bits belong to the arch code"

ANBZ: #31045

This reverts commit 24788aacf473a7230bc215ee915cc721d742168c.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 5a66e3b2c2ea..856beb6f668b 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -85,8 +85,6 @@ static const struct class pseudo_lock_class = {
  */
 u64 resctrl_arch_get_prefetch_disable_bits(void)
 {
-	prefetch_disable_bits = 0;
-
 	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL ||
 	    boot_cpu_data.x86 != 6)
 		return 0;
@@ -102,8 +100,7 @@ u64 resctrl_arch_get_prefetch_disable_bits(void)
 		 * 3    DCU IP Prefetcher Disable (R/W)
 		 * 63:4 Reserved
 		 */
-		prefetch_disable_bits = 0xF;
-		break;
+		return 0xF;
 	case INTEL_FAM6_ATOM_GOLDMONT:
 	case INTEL_FAM6_ATOM_GOLDMONT_PLUS:
 		/*
@@ -114,11 +111,10 @@ u64 resctrl_arch_get_prefetch_disable_bits(void)
 		 * 2     DCU Hardware Prefetcher Disable (R/W)
 		 * 63:3  Reserved
 		 */
-		prefetch_disable_bits = 0x5;
-		break;
+		return 0x5;
 	}
 
-	return prefetch_disable_bits;
+	return 0;
 }
 
 /**
@@ -719,7 +715,8 @@ int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
 	 * Not knowing the bits to disable prefetching implies that this
 	 * platform does not support Cache Pseudo-Locking.
 	 */
-	if (resctrl_arch_get_prefetch_disable_bits() == 0) {
+	prefetch_disable_bits = resctrl_arch_get_prefetch_disable_bits();
+	if (prefetch_disable_bits == 0) {
 		rdt_last_cmd_puts("Pseudo-locking not supported\n");
 		return -EINVAL;
 	}
-- 
Gitee


From c2b48732df4937b9c5899eb3420e46a65ac5b1eb Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 137/280] anolis: Revert "x86/resctrl: Allow an architecture to
 disable pseudo lock"

ANBZ: #31045

This reverts commit fa816439275b4f01b895892d4052426e4a9ce871.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/Kconfig                       |  7 ----
 arch/x86/kernel/cpu/resctrl/Makefile   |  5 ++-
 arch/x86/kernel/cpu/resctrl/internal.h | 48 +++++---------------------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |  3 +-
 4 files changed, 11 insertions(+), 52 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ac2e95c097c3..890c59602fc0 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -494,7 +494,6 @@ config X86_CPU_RESCTRL
 	depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD)
 	select KERNFS
 	select PROC_CPU_RESCTRL		if PROC_FS
-	select RESCTRL_FS_PSEUDO_LOCK
 	help
 	  Enable x86 CPU resource control support.
 
@@ -511,12 +510,6 @@ config X86_CPU_RESCTRL
 
 	  Say N if unsure.
 
-config RESCTRL_FS_PSEUDO_LOCK
-	bool
-	help
-	  Software mechanism to pin data in a cache portion using
-	  micro-architecture specific knowledge.
-
 if X86_32
 config X86_BIGSMP
 	bool "Support for big SMP systems with more than 8 CPUs"
diff --git a/arch/x86/kernel/cpu/resctrl/Makefile b/arch/x86/kernel/cpu/resctrl/Makefile
index 0c13b0befd8a..4a06c37b9cf1 100644
--- a/arch/x86/kernel/cpu/resctrl/Makefile
+++ b/arch/x86/kernel/cpu/resctrl/Makefile
@@ -1,5 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_X86_CPU_RESCTRL)		+= core.o rdtgroup.o monitor.o
-obj-$(CONFIG_X86_CPU_RESCTRL)		+= ctrlmondata.o
-obj-$(CONFIG_RESCTRL_FS_PSEUDO_LOCK)	+= pseudo_lock.o
+obj-$(CONFIG_X86_CPU_RESCTRL)	+= core.o rdtgroup.o monitor.o
+obj-$(CONFIG_X86_CPU_RESCTRL)	+= ctrlmondata.o pseudo_lock.o
 CFLAGS_pseudo_lock.o = -I$(src)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index d6db15839dc4..238b81d3f64a 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -489,6 +489,14 @@ unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_domain *d,
 				  unsigned long cbm);
 enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
 int rdtgroup_tasks_assigned(struct rdtgroup *r);
+int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
+int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp);
+bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm);
+bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d);
+int rdt_pseudo_lock_init(void);
+void rdt_pseudo_lock_release(void);
+int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
+void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
 struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r);
 int closids_supported(void);
 void closid_free(int closid);
@@ -521,44 +529,4 @@ void rdt_staged_configs_clear(void);
 bool closid_allocated(unsigned int closid);
 int resctrl_find_cleanest_closid(void);
 
-#ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
-int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
-int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp);
-bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm);
-bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d);
-int rdt_pseudo_lock_init(void);
-void rdt_pseudo_lock_release(void);
-int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
-void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
-#else
-static inline int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
-{
-	return -EOPNOTSUPP;
-}
-
-static inline int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
-{
-	return -EOPNOTSUPP;
-}
-
-static inline bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm)
-{
-	return false;
-}
-
-static inline bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
-{
-	return false;
-}
-
-static inline int rdt_pseudo_lock_init(void) { return 0; }
-static inline void rdt_pseudo_lock_release(void) { }
-static inline int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
-{
-	return -EOPNOTSUPP;
-}
-
-static inline void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp) { }
-#endif /* CONFIG_RESCTRL_FS_PSEUDO_LOCK */
-
 #endif /* _ASM_X86_RESCTRL_INTERNAL_H */
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 9275d6f8a74e..56a0bfdc11f7 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1452,8 +1452,7 @@ static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
 				goto out;
 		}
 		rdtgrp->mode = RDT_MODE_EXCLUSIVE;
-	} else if (IS_ENABLED(CONFIG_RESCTRL_FS_PSEUDO_LOCK) &&
-		   !strcmp(buf, "pseudo-locksetup")) {
+	} else if (!strcmp(buf, "pseudo-locksetup")) {
 		ret = rdtgroup_locksetup_enter(rdtgrp);
 		if (ret)
 			goto out;
-- 
Gitee


From 7c4f81b97598a544e65d0d4dc448f79a7dee1715 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 138/280] anolis: Revert "x86/resctrl: Add resctrl_arch_ prefix
 to pseudo lock functions"

ANBZ: #31045

This reverts commit 46675abeaadea4d56bca73b2a9ed9bcbdaf7d8c4.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h            |  5 ----
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 36 +++++++++++------------
 2 files changed, 17 insertions(+), 24 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index a88af68f9fe2..50407e83d0ca 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -211,11 +211,6 @@ static inline void *resctrl_arch_mon_ctx_alloc(struct rdt_resource *r, int evtid
 static inline void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid,
 					     void *ctx) { };
 
-u64 resctrl_arch_get_prefetch_disable_bits(void);
-int resctrl_arch_pseudo_lock_fn(void *_rdtgrp);
-int resctrl_arch_measure_cycles_lat_fn(void *_plr);
-int resctrl_arch_measure_l2_residency(void *_plr);
-int resctrl_arch_measure_l3_residency(void *_plr);
 void resctrl_cpu_detect(struct cpuinfo_x86 *c);
 
 #else
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 856beb6f668b..f2315a50ea4f 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -62,8 +62,7 @@ static const struct class pseudo_lock_class = {
 };
 
 /**
- * resctrl_arch_get_prefetch_disable_bits - prefetch disable bits of supported
- *                                          platforms
+ * get_prefetch_disable_bits - prefetch disable bits of supported platforms
  * @void: It takes no parameters.
  *
  * Capture the list of platforms that have been validated to support
@@ -77,13 +76,13 @@ static const struct class pseudo_lock_class = {
  * in the SDM.
  *
  * When adding a platform here also add support for its cache events to
- * resctrl_arch_measure_l*_residency()
+ * measure_cycles_perf_fn()
  *
  * Return:
  * If platform is supported, the bits to disable hardware prefetchers, 0
  * if platform is not supported.
  */
-u64 resctrl_arch_get_prefetch_disable_bits(void)
+static u64 get_prefetch_disable_bits(void)
 {
 	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL ||
 	    boot_cpu_data.x86 != 6)
@@ -411,7 +410,7 @@ static void pseudo_lock_free(struct rdtgroup *rdtgrp)
 }
 
 /**
- * resctrl_arch_pseudo_lock_fn - Load kernel memory into cache
+ * pseudo_lock_fn - Load kernel memory into cache
  * @_rdtgrp: resource group to which pseudo-lock region belongs
  *
  * This is the core pseudo-locking flow.
@@ -429,7 +428,7 @@ static void pseudo_lock_free(struct rdtgroup *rdtgrp)
  *
  * Return: 0. Waiter on waitqueue will be woken on completion.
  */
-int resctrl_arch_pseudo_lock_fn(void *_rdtgrp)
+static int pseudo_lock_fn(void *_rdtgrp)
 {
 	struct rdtgroup *rdtgrp = _rdtgrp;
 	struct pseudo_lock_region *plr = rdtgrp->plr;
@@ -715,7 +714,7 @@ int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
 	 * Not knowing the bits to disable prefetching implies that this
 	 * platform does not support Cache Pseudo-Locking.
 	 */
-	prefetch_disable_bits = resctrl_arch_get_prefetch_disable_bits();
+	prefetch_disable_bits = get_prefetch_disable_bits();
 	if (prefetch_disable_bits == 0) {
 		rdt_last_cmd_puts("Pseudo-locking not supported\n");
 		return -EINVAL;
@@ -880,8 +879,7 @@ bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
 }
 
 /**
- * resctrl_arch_measure_cycles_lat_fn - Measure cycle latency to read
- *                                      pseudo-locked memory
+ * measure_cycles_lat_fn - Measure cycle latency to read pseudo-locked memory
  * @_plr: pseudo-lock region to measure
  *
  * There is no deterministic way to test if a memory region is cached. One
@@ -894,7 +892,7 @@ bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
  *
  * Return: 0. Waiter on waitqueue will be woken on completion.
  */
-int resctrl_arch_measure_cycles_lat_fn(void *_plr)
+static int measure_cycles_lat_fn(void *_plr)
 {
 	struct pseudo_lock_region *plr = _plr;
 	u32 saved_low, saved_high;
@@ -1078,7 +1076,7 @@ static int measure_residency_fn(struct perf_event_attr *miss_attr,
 	return 0;
 }
 
-int resctrl_arch_measure_l2_residency(void *_plr)
+static int measure_l2_residency(void *_plr)
 {
 	struct pseudo_lock_region *plr = _plr;
 	struct residency_counts counts = {0};
@@ -1116,7 +1114,7 @@ int resctrl_arch_measure_l2_residency(void *_plr)
 	return 0;
 }
 
-int resctrl_arch_measure_l3_residency(void *_plr)
+static int measure_l3_residency(void *_plr)
 {
 	struct pseudo_lock_region *plr = _plr;
 	struct residency_counts counts = {0};
@@ -1214,18 +1212,18 @@ static int pseudo_lock_measure_cycles(struct rdtgroup *rdtgrp, int sel)
 	plr->cpu = cpu;
 
 	if (sel == 1)
-		thread = kthread_create_on_node(resctrl_arch_measure_cycles_lat_fn,
-						plr, cpu_to_node(cpu),
+		thread = kthread_create_on_node(measure_cycles_lat_fn, plr,
+						cpu_to_node(cpu),
 						"pseudo_lock_measure/%u",
 						cpu);
 	else if (sel == 2)
-		thread = kthread_create_on_node(resctrl_arch_measure_l2_residency,
-						plr, cpu_to_node(cpu),
+		thread = kthread_create_on_node(measure_l2_residency, plr,
+						cpu_to_node(cpu),
 						"pseudo_lock_measure/%u",
 						cpu);
 	else if (sel == 3)
-		thread = kthread_create_on_node(resctrl_arch_measure_l3_residency,
-						plr, cpu_to_node(cpu),
+		thread = kthread_create_on_node(measure_l3_residency, plr,
+						cpu_to_node(cpu),
 						"pseudo_lock_measure/%u",
 						cpu);
 	else
@@ -1324,7 +1322,7 @@ int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
 
 	plr->thread_done = 0;
 
-	thread = kthread_create_on_node(resctrl_arch_pseudo_lock_fn, rdtgrp,
+	thread = kthread_create_on_node(pseudo_lock_fn, rdtgrp,
 					cpu_to_node(plr->cpu),
 					"pseudo_lock/%u", plr->cpu);
 	if (IS_ERR(thread)) {
-- 
Gitee


From 685c0ee8b59cb93168f6ca8691c0a02d6785b2eb Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 139/280] anolis: Revert "x86/resctrl: Allow
 resctrl_arch_mon_event_config_write() to return an error"

ANBZ: #31045

This reverts commit cb2184614818e523e1637ff60e77b2f9f6045330.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 20 ++++----------------
 include/linux/resctrl.h                |  1 -
 2 files changed, 4 insertions(+), 17 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 56a0bfdc11f7..3d3a839eba6b 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1685,16 +1685,13 @@ void resctrl_arch_mon_event_config_write(void *info)
 	index = mon_event_config_index_get(mon_info->evtid);
 	if (index == INVALID_CONFIG_INDEX) {
 		pr_warn_once("Invalid event id %d\n", mon_info->evtid);
-		mon_info->err = -EINVAL;
 		return;
 	}
 	wrmsr(MSR_IA32_EVT_CFG_BASE + index, mon_info->mon_config, 0);
-
-	mon_info->err = 0;
 }
 
-static int mbm_config_write_domain(struct rdt_resource *r,
-				   struct rdt_domain *d, u32 evtid, u32 val)
+static void mbm_config_write_domain(struct rdt_resource *r,
+				    struct rdt_domain *d, u32 evtid, u32 val)
 {
 	struct resctrl_mon_config_info mon_info = {0};
 
@@ -1707,7 +1704,7 @@ static int mbm_config_write_domain(struct rdt_resource *r,
 	mon_info.evtid = evtid;
 	mondata_config_read(&mon_info);
 	if (mon_info.mon_config == val)
-		return 0;
+		return;
 
 	mon_info.mon_config = val;
 
@@ -1719,10 +1716,6 @@ static int mbm_config_write_domain(struct rdt_resource *r,
 	 */
 	smp_call_function_any(&d->cpu_mask, resctrl_arch_mon_event_config_write,
 			      &mon_info, 1);
-	if (mon_info.err) {
-		rdt_last_cmd_puts("Invalid event configuration\n");
-		return mon_info.err;
-	}
 
 	/*
 	 * When an Event Configuration is changed, the bandwidth counters
@@ -1734,8 +1727,6 @@ static int mbm_config_write_domain(struct rdt_resource *r,
 	 * mbm_local and mbm_total counts for all the RMIDs.
 	 */
 	resctrl_arch_reset_rmid_all(r, d);
-
-	return 0;
 }
 
 static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
@@ -1743,7 +1734,6 @@ static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
 	char *dom_str = NULL, *id_str;
 	unsigned long dom_id, val;
 	struct rdt_domain *d;
-	int err;
 
 	/* Walking r->domains, ensure it can't race with cpuhp */
 	lockdep_assert_cpus_held();
@@ -1775,9 +1765,7 @@ static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
 
 	list_for_each_entry(d, &r->domains, list) {
 		if (d->id == dom_id) {
-			err = mbm_config_write_domain(r, d, evtid, val);
-			if (err)
-				return err;
+			mbm_config_write_domain(r, d, evtid, val);
 			goto next;
 		}
 	}
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 6705d7960dfd..8a7367d1ce45 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -200,7 +200,6 @@ struct resctrl_mon_config_info {
 	struct rdt_domain   *d;
 	u32                  evtid;
 	u32                  mon_config;
-	int                  err;
 };
 
 /*
-- 
Gitee


From 7b590300198d04c648d45116fc7fd45b68bf33d6 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 140/280] anolis: Revert "x86/resctrl: Move mbm_cfg_mask to
 struct rdt_resource"

ANBZ: #31045

This reverts commit 7d1348ba72bccf70e3f76fab947927af2d4a3dc9.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h | 3 +++
 arch/x86/kernel/cpu/resctrl/monitor.c  | 2 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 5 +++--
 include/linux/resctrl.h                | 3 ---
 4 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 238b81d3f64a..46370eafb00f 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -371,6 +371,8 @@ struct msr_param {
  * @msr_update:		Function pointer to update QOS MSRs
  * @mon_scale:		cqm counter * mon_scale = occupancy in bytes
  * @mbm_width:		Monitor width, to detect and correct for overflow.
+ * @mbm_cfg_mask:	Bandwidth sources that can be tracked when Bandwidth
+ *			Monitoring Event Configuration (BMEC) is supported.
  * @cdp_enabled:	CDP state of this resource
  *
  * Members of this structure are either private to the architecture
@@ -385,6 +387,7 @@ struct rdt_hw_resource {
 				 struct rdt_resource *r);
 	unsigned int		mon_scale;
 	unsigned int		mbm_width;
+	unsigned int		mbm_cfg_mask;
 	bool			cdp_enabled;
 };
 
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 287fb0a5f060..ccb85c61b43b 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1068,7 +1068,7 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 
 		/* Detect list of bandwidth sources that can be tracked */
 		cpuid_count(0x80000020, 3, &eax, &ebx, &ecx, &edx);
-		r->mbm_cfg_mask = ecx & MAX_EVT_CONFIG_BITS;
+		hw_res->mbm_cfg_mask = ecx & MAX_EVT_CONFIG_BITS;
 	}
 
 	r->mon_capable = true;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 3d3a839eba6b..e76018687117 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1731,6 +1731,7 @@ static void mbm_config_write_domain(struct rdt_resource *r,
 
 static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
 {
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	char *dom_str = NULL, *id_str;
 	unsigned long dom_id, val;
 	struct rdt_domain *d;
@@ -1757,9 +1758,9 @@ static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
 	}
 
 	/* Value from user cannot be more than the supported set of events */
-	if ((val & r->mbm_cfg_mask) != val) {
+	if ((val & hw_res->mbm_cfg_mask) != val) {
 		rdt_last_cmd_printf("Invalid event configuration: max valid mask is 0x%02x\n",
-				    r->mbm_cfg_mask);
+				    hw_res->mbm_cfg_mask);
 		return -EINVAL;
 	}
 
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 8a7367d1ce45..975b80102fbe 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -140,8 +140,6 @@ struct resctrl_membw {
  * @format_str:		Per resource format string to show domain value
  * @evt_list:		List of monitoring events
  * @fflags:		flags to choose base and info files
- * @mbm_cfg_mask:	Bandwidth sources that can be tracked when Bandwidth
- *			Monitoring Event Configuration (BMEC) is supported.
  * @cdp_capable:	Is the CDP feature available on this resource
  */
 struct rdt_resource {
@@ -159,7 +157,6 @@ struct rdt_resource {
 	const char		*format_str;
 	struct list_head	evt_list;
 	unsigned long		fflags;
-	unsigned int		mbm_cfg_mask;
 	bool			cdp_capable;
 };
 
-- 
Gitee


From 281750e207e4bb4101d1e093c843c37ecd839517 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 141/280] anolis: Revert "x86/resctrl: Change
 mon_event_config_{read,write}() to be arch helpers"

ANBZ: #31045

This reverts commit e4dc4973daef1f2cedb66fb526cdf377e5ce73a8.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 34 +++++++++++++-------------
 include/linux/resctrl.h                |  9 -------
 2 files changed, 17 insertions(+), 26 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index e76018687117..2d6f4e0d3656 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1580,6 +1580,11 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 	return ret;
 }
 
+struct mon_config_info {
+	u32 evtid;
+	u32 mon_config;
+};
+
 #define INVALID_CONFIG_INDEX   UINT_MAX
 
 /**
@@ -1604,9 +1609,9 @@ static inline unsigned int mon_event_config_index_get(u32 evtid)
 	}
 }
 
-void resctrl_arch_mon_event_config_read(void *info)
+static void mon_event_config_read(void *info)
 {
-	struct resctrl_mon_config_info *mon_info = info;
+	struct mon_config_info *mon_info = info;
 	unsigned int index;
 	u64 msrval;
 
@@ -1621,15 +1626,14 @@ void resctrl_arch_mon_event_config_read(void *info)
 	mon_info->mon_config = msrval & MAX_EVT_CONFIG_BITS;
 }
 
-static void mondata_config_read(struct resctrl_mon_config_info *mon_info)
+static void mondata_config_read(struct rdt_domain *d, struct mon_config_info *mon_info)
 {
-	smp_call_function_any(&mon_info->d->cpu_mask,
-			      resctrl_arch_mon_event_config_read, mon_info, 1);
+	smp_call_function_any(&d->cpu_mask, mon_event_config_read, mon_info, 1);
 }
 
 static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid)
 {
-	struct resctrl_mon_config_info mon_info = {0};
+	struct mon_config_info mon_info = {0};
 	struct rdt_domain *dom;
 	bool sep = false;
 
@@ -1640,11 +1644,9 @@ static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid
 		if (sep)
 			seq_puts(s, ";");
 
-		memset(&mon_info, 0, sizeof(struct resctrl_mon_config_info));
-		mon_info.r = r;
-		mon_info.d = dom;
+		memset(&mon_info, 0, sizeof(struct mon_config_info));
 		mon_info.evtid = evtid;
-		mondata_config_read(&mon_info);
+		mondata_config_read(dom, &mon_info);
 
 		seq_printf(s, "%d=0x%02x", dom->id, mon_info.mon_config);
 		sep = true;
@@ -1677,9 +1679,9 @@ static int mbm_local_bytes_config_show(struct kernfs_open_file *of,
 	return 0;
 }
 
-void resctrl_arch_mon_event_config_write(void *info)
+static void mon_event_config_write(void *info)
 {
-	struct resctrl_mon_config_info *mon_info = info;
+	struct mon_config_info *mon_info = info;
 	unsigned int index;
 
 	index = mon_event_config_index_get(mon_info->evtid);
@@ -1693,16 +1695,14 @@ void resctrl_arch_mon_event_config_write(void *info)
 static void mbm_config_write_domain(struct rdt_resource *r,
 				    struct rdt_domain *d, u32 evtid, u32 val)
 {
-	struct resctrl_mon_config_info mon_info = {0};
+	struct mon_config_info mon_info = {0};
 
 	/*
 	 * Read the current config value first. If both are the same then
 	 * no need to write it again.
 	 */
-	mon_info.r = r;
-	mon_info.d = d;
 	mon_info.evtid = evtid;
-	mondata_config_read(&mon_info);
+	mondata_config_read(d, &mon_info);
 	if (mon_info.mon_config == val)
 		return;
 
@@ -1714,7 +1714,7 @@ static void mbm_config_write_domain(struct rdt_resource *r,
 	 * are scoped at the domain level. Writing any of these MSRs
 	 * on one CPU is observed by all the CPUs in the domain.
 	 */
-	smp_call_function_any(&d->cpu_mask, resctrl_arch_mon_event_config_write,
+	smp_call_function_any(&d->cpu_mask, mon_event_config_write,
 			      &mon_info, 1);
 
 	/*
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 975b80102fbe..bfc63e8219e5 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -192,13 +192,6 @@ struct resctrl_cpu_sync {
 	u32 rmid;
 };
 
-struct resctrl_mon_config_info {
-	struct rdt_resource *r;
-	struct rdt_domain   *d;
-	u32                  evtid;
-	u32                  mon_config;
-};
-
 /*
  * Update and re-load this CPUs defaults. Called via IPI, takes a pointer to
  * struct resctrl_cpu_sync, or NULL.
@@ -212,8 +205,6 @@ struct rdt_domain *resctrl_arch_find_domain(struct rdt_resource *r, int id);
 int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid);
 
 bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt);
-void resctrl_arch_mon_event_config_write(void *info);
-void resctrl_arch_mon_event_config_read(void *info);
 
 /*
  * Update the ctrl_val and apply this config right now.
-- 
Gitee


From f4fb167a3d87ce68bb6e759994630e50dbe7faf1 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 142/280] anolis: Revert "x86/resctrl: Add
 resctrl_arch_is_evt_configurable() to abstract BMEC"

ANBZ: #31045

This reverts commit 74891eb97fc52327d7cca15339198b54158bb9ce.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     | 19 ++-----------------
 arch/x86/kernel/cpu/resctrl/internal.h |  4 ++--
 arch/x86/kernel/cpu/resctrl/monitor.c  | 18 +++++++++---------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |  2 +-
 include/linux/resctrl.h                |  2 --
 5 files changed, 14 insertions(+), 31 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index a320e3d1c2c9..c23d5da137cd 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -667,7 +667,7 @@ struct rdt_options {
 	bool	force_off, force_on;
 };
 
-static struct rdt_options rdt_options[]  __ro_after_init = {
+static struct rdt_options rdt_options[]  __initdata = {
 	RDT_OPT(RDT_FLAG_CMT,	    "cmt",	X86_FEATURE_CQM_OCCUP_LLC),
 	RDT_OPT(RDT_FLAG_MBM_TOTAL, "mbmtotal", X86_FEATURE_CQM_MBM_TOTAL),
 	RDT_OPT(RDT_FLAG_MBM_LOCAL, "mbmlocal", X86_FEATURE_CQM_MBM_LOCAL),
@@ -707,7 +707,7 @@ static int __init set_rdt_options(char *str)
 }
 __setup("rdt", set_rdt_options);
 
-bool rdt_cpu_has(int flag)
+bool __init rdt_cpu_has(int flag)
 {
 	bool ret = boot_cpu_has(flag);
 	struct rdt_options *o;
@@ -727,21 +727,6 @@ bool rdt_cpu_has(int flag)
 	return ret;
 }
 
-bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt)
-{
-	if (!rdt_cpu_has(X86_FEATURE_BMEC))
-		return false;
-
-	switch (evt) {
-	case QOS_L3_MBM_TOTAL_EVENT_ID:
-		return rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL);
-	case QOS_L3_MBM_LOCAL_EVENT_ID:
-		return rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL);
-	default:
-		return false;
-	}
-}
-
 static __init bool get_mem_config(void)
 {
 	struct rdt_hw_resource *hw_res = &rdt_resources_all[RDT_RESOURCE_MBA];
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 46370eafb00f..edbccc79246f 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -507,7 +507,7 @@ int alloc_rmid(u32 closid);
 void free_rmid(u32 closid, u32 rmid);
 int rdt_get_mon_l3_config(struct rdt_resource *r);
 void __exit resctrl_mon_resource_exit(void);
-bool rdt_cpu_has(int flag);
+bool __init rdt_cpu_has(int flag);
 void mon_event_count(void *info);
 int rdtgroup_mondata_show(struct seq_file *m, void *arg);
 void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
@@ -527,7 +527,7 @@ bool has_busy_rmid(struct rdt_domain *d);
 void __check_limbo(struct rdt_domain *d, bool force_free);
 void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
 void __init thread_throttle_mode_init(void);
-void mbm_config_rftype_init(const char *config);
+void __init mbm_config_rftype_init(const char *config);
 void rdt_staged_configs_clear(void);
 bool closid_allocated(unsigned int closid);
 int resctrl_find_cleanest_closid(void);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index ccb85c61b43b..c9be2d0819c0 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1019,15 +1019,6 @@ int resctrl_mon_resource_init(void)
 
 	l3_mon_evt_init(r);
 
-	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_TOTAL_EVENT_ID)) {
-		mbm_total_event.configurable = true;
-		mbm_config_rftype_init("mbm_total_bytes_config");
-	}
-	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_LOCAL_EVENT_ID)) {
-		mbm_local_event.configurable = true;
-		mbm_config_rftype_init("mbm_local_bytes_config");
-	}
-
 	return 0;
 }
 
@@ -1069,6 +1060,15 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 		/* Detect list of bandwidth sources that can be tracked */
 		cpuid_count(0x80000020, 3, &eax, &ebx, &ecx, &edx);
 		hw_res->mbm_cfg_mask = ecx & MAX_EVT_CONFIG_BITS;
+
+		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL)) {
+			mbm_total_event.configurable = true;
+			mbm_config_rftype_init("mbm_total_bytes_config");
+		}
+		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL)) {
+			mbm_local_event.configurable = true;
+			mbm_config_rftype_init("mbm_local_bytes_config");
+		}
 	}
 
 	r->mon_capable = true;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 2d6f4e0d3656..8285b916289c 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2068,7 +2068,7 @@ void __init thread_throttle_mode_init(void)
 	rft->fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_MB;
 }
 
-void mbm_config_rftype_init(const char *config)
+void __init mbm_config_rftype_init(const char *config)
 {
 	struct rftype *rft;
 
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index bfc63e8219e5..b0ee7256e095 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -204,8 +204,6 @@ u32 resctrl_arch_get_num_closid(struct rdt_resource *r);
 struct rdt_domain *resctrl_arch_find_domain(struct rdt_resource *r, int id);
 int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid);
 
-bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt);
-
 /*
  * Update the ctrl_val and apply this config right now.
  * Must be called on one of the domain's CPUs.
-- 
Gitee


From 5ab98ab99e667fd7cb234db6b7abae0b0fbb2a95 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 143/280] anolis: Revert "x86/resctrl: Export the
 is_mbm_*_enabled() helpers to asm/resctrl.h"

ANBZ: #31045

This reverts commit cfefad27a56d4595c818c167344eef6753eb306d.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h         | 17 -----------
 arch/x86/kernel/cpu/resctrl/core.c     |  4 +--
 arch/x86/kernel/cpu/resctrl/internal.h | 27 +++++++++++++++++
 arch/x86/kernel/cpu/resctrl/monitor.c  | 18 ++++++------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 40 +++++++++-----------------
 5 files changed, 52 insertions(+), 54 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 50407e83d0ca..5f6a5375bb4a 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -7,7 +7,6 @@
 #include <linux/jump_label.h>
 #include <linux/percpu.h>
 #include <linux/sched.h>
-#include <linux/resctrl_types.h>
 
 /*
  * This value can never be a valid CLOSID, and is used when mapping a
@@ -44,7 +43,6 @@ DECLARE_PER_CPU(struct resctrl_pqr_state, pqr_state);
 
 extern bool rdt_alloc_capable;
 extern bool rdt_mon_capable;
-extern unsigned int rdt_mon_features;
 
 DECLARE_STATIC_KEY_FALSE(rdt_enable_key);
 DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
@@ -84,21 +82,6 @@ static inline void resctrl_arch_disable_mon(void)
 	static_branch_dec_cpuslocked(&rdt_enable_key);
 }
 
-static inline bool resctrl_arch_is_llc_occupancy_enabled(void)
-{
-	return (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID));
-}
-
-static inline bool resctrl_arch_is_mbm_total_enabled(void)
-{
-	return (rdt_mon_features & (1 << QOS_L3_MBM_TOTAL_EVENT_ID));
-}
-
-static inline bool resctrl_arch_is_mbm_local_enabled(void)
-{
-	return (rdt_mon_features & (1 << QOS_L3_MBM_LOCAL_EVENT_ID));
-}
-
 /*
  * __resctrl_sched_in() - Writes the task's CLOSid/RMID to IA32_PQR_MSR
  *
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index c23d5da137cd..7242d15d4806 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -481,13 +481,13 @@ static int arch_domain_mbm_alloc(u32 num_rmid, struct rdt_hw_domain *hw_dom)
 {
 	size_t tsize;
 
-	if (resctrl_arch_is_mbm_total_enabled()) {
+	if (is_mbm_total_enabled()) {
 		tsize = sizeof(*hw_dom->arch_mbm_total);
 		hw_dom->arch_mbm_total = kcalloc(num_rmid, tsize, GFP_KERNEL);
 		if (!hw_dom->arch_mbm_total)
 			return -ENOMEM;
 	}
-	if (resctrl_arch_is_mbm_local_enabled()) {
+	if (is_mbm_local_enabled()) {
 		tsize = sizeof(*hw_dom->arch_mbm_local);
 		hw_dom->arch_mbm_local = kcalloc(num_rmid, tsize, GFP_KERNEL);
 		if (!hw_dom->arch_mbm_local) {
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index edbccc79246f..01fcd4ef26ca 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -130,6 +130,7 @@ struct rmid_read {
 	void			*arch_mon_ctx;
 };
 
+extern unsigned int rdt_mon_features;
 extern struct list_head resctrl_schema_all;
 extern bool resctrl_mounted;
 
@@ -359,6 +360,32 @@ struct msr_param {
 	u32			high;
 };
 
+static inline bool is_llc_occupancy_enabled(void)
+{
+	return (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID));
+}
+
+static inline bool is_mbm_total_enabled(void)
+{
+	return (rdt_mon_features & (1 << QOS_L3_MBM_TOTAL_EVENT_ID));
+}
+
+static inline bool is_mbm_local_enabled(void)
+{
+	return (rdt_mon_features & (1 << QOS_L3_MBM_LOCAL_EVENT_ID));
+}
+
+static inline bool is_mbm_enabled(void)
+{
+	return (is_mbm_total_enabled() || is_mbm_local_enabled());
+}
+
+static inline bool is_mbm_event(int e)
+{
+	return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
+		e <= QOS_L3_MBM_LOCAL_EVENT_ID);
+}
+
 /**
  * struct rdt_hw_resource - arch private attributes of a resctrl resource
  * @r_resctrl:		Attributes of the resource used directly by resctrl.
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index c9be2d0819c0..2a1cbd4de6ee 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -251,11 +251,11 @@ void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_domain *d)
 {
 	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
 
-	if (resctrl_arch_is_mbm_total_enabled())
+	if (is_mbm_total_enabled())
 		memset(hw_dom->arch_mbm_total, 0,
 		       sizeof(*hw_dom->arch_mbm_total) * r->num_rmid);
 
-	if (resctrl_arch_is_mbm_local_enabled())
+	if (is_mbm_local_enabled())
 		memset(hw_dom->arch_mbm_local, 0,
 		       sizeof(*hw_dom->arch_mbm_local) * r->num_rmid);
 }
@@ -514,7 +514,7 @@ void free_rmid(u32 closid, u32 rmid)
 
 	entry = __rmid_entry(idx);
 
-	if (resctrl_arch_is_llc_occupancy_enabled())
+	if (is_llc_occupancy_enabled())
 		add_rmid_to_limbo(entry);
 	else
 		list_add_tail(&entry->list, &rmid_free_lru);
@@ -666,7 +666,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
 	struct list_head *head;
 	struct rdtgroup *entry;
 
-	if (!resctrl_arch_is_mbm_local_enabled())
+	if (!is_mbm_local_enabled())
 		return;
 
 	r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
@@ -735,7 +735,7 @@ static void mbm_update(struct rdt_resource *r, struct rdt_domain *d,
 	 * This is protected from concurrent reads from user
 	 * as both the user and we hold the global mutex.
 	 */
-	if (resctrl_arch_is_mbm_total_enabled()) {
+	if (is_mbm_total_enabled()) {
 		rr.evtid = QOS_L3_MBM_TOTAL_EVENT_ID;
 		rr.val = 0;
 		rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
@@ -749,7 +749,7 @@ static void mbm_update(struct rdt_resource *r, struct rdt_domain *d,
 
 		resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
 	}
-	if (resctrl_arch_is_mbm_local_enabled()) {
+	if (is_mbm_local_enabled()) {
 		rr.evtid = QOS_L3_MBM_LOCAL_EVENT_ID;
 		rr.val = 0;
 		rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
@@ -997,11 +997,11 @@ static void l3_mon_evt_init(struct rdt_resource *r)
 {
 	INIT_LIST_HEAD(&r->evt_list);
 
-	if (resctrl_arch_is_llc_occupancy_enabled())
+	if (is_llc_occupancy_enabled())
 		list_add_tail(&llc_occupancy_event.list, &r->evt_list);
-	if (resctrl_arch_is_mbm_total_enabled())
+	if (is_mbm_total_enabled())
 		list_add_tail(&mbm_total_event.list, &r->evt_list);
-	if (resctrl_arch_is_mbm_local_enabled())
+	if (is_mbm_local_enabled())
 		list_add_tail(&mbm_local_event.list, &r->evt_list);
 }
 
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 8285b916289c..3f16e7854411 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -114,18 +114,6 @@ void rdt_staged_configs_clear(void)
 	}
 }
 
-static bool resctrl_is_mbm_enabled(void)
-{
-	return (resctrl_arch_is_mbm_total_enabled() ||
-		resctrl_arch_is_mbm_local_enabled());
-}
-
-static bool resctrl_is_mbm_event(int e)
-{
-	return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
-		e <= QOS_L3_MBM_LOCAL_EVENT_ID);
-}
-
 /*
  * Trivial allocator for CLOSIDs. Since h/w only supports a small number,
  * we can keep a bitmap of free CLOSIDs in a single integer.
@@ -173,7 +161,7 @@ static int closid_alloc(void)
 	lockdep_assert_held(&rdtgroup_mutex);
 
 	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID) &&
-	    resctrl_arch_is_llc_occupancy_enabled()) {
+	    is_llc_occupancy_enabled()) {
 		cleanest_closid = resctrl_find_cleanest_closid();
 		if (cleanest_closid < 0)
 			return cleanest_closid;
@@ -2382,7 +2370,7 @@ static bool supports_mba_mbps(void)
 {
 	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
 
-	return (resctrl_arch_is_mbm_local_enabled() &&
+	return (is_mbm_local_enabled() &&
 		r->alloc_capable && is_mba_linear());
 }
 
@@ -2750,7 +2738,7 @@ static int rdt_get_tree(struct fs_context *fc)
 	if (resctrl_arch_alloc_capable() || resctrl_arch_mon_capable())
 		resctrl_mounted = true;
 
-	if (resctrl_is_mbm_enabled()) {
+	if (is_mbm_enabled()) {
 		list_for_each_entry(dom, &l3->domains, list)
 			mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL,
 						   RESCTRL_PICK_ANY_CPU);
@@ -3119,7 +3107,7 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
 		if (ret)
 			goto out_destroy;
 
-		if (resctrl_is_mbm_event(mevt->evtid))
+		if (is_mbm_event(mevt->evtid))
 			mon_event_read(&rr, r, d, prgrp, mevt->evtid, true);
 	}
 	kernfs_activate(kn);
@@ -4018,9 +4006,9 @@ void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d)
 	if (resctrl_mounted && resctrl_arch_mon_capable())
 		rmdir_mondata_subdir_allrdtgrp(r, d->id);
 
-	if (resctrl_is_mbm_enabled())
+	if (is_mbm_enabled())
 		cancel_delayed_work(&d->mbm_over);
-	if (resctrl_arch_is_llc_occupancy_enabled() && has_busy_rmid(d)) {
+	if (is_llc_occupancy_enabled() && has_busy_rmid(d)) {
 		/*
 		 * When a package is going down, forcefully
 		 * decrement rmid->ebusy. There is no way to know
@@ -4044,12 +4032,12 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
 	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
 	size_t tsize;
 
-	if (resctrl_arch_is_llc_occupancy_enabled()) {
+	if (is_llc_occupancy_enabled()) {
 		d->rmid_busy_llc = bitmap_zalloc(idx_limit, GFP_KERNEL);
 		if (!d->rmid_busy_llc)
 			return -ENOMEM;
 	}
-	if (resctrl_arch_is_mbm_total_enabled()) {
+	if (is_mbm_total_enabled()) {
 		tsize = sizeof(*d->mbm_total);
 		d->mbm_total = kcalloc(idx_limit, tsize, GFP_KERNEL);
 		if (!d->mbm_total) {
@@ -4057,7 +4045,7 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
 			return -ENOMEM;
 		}
 	}
-	if (resctrl_arch_is_mbm_local_enabled()) {
+	if (is_mbm_local_enabled()) {
 		tsize = sizeof(*d->mbm_local);
 		d->mbm_local = kcalloc(idx_limit, tsize, GFP_KERNEL);
 		if (!d->mbm_local) {
@@ -4089,13 +4077,13 @@ int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d)
 	if (err)
 		goto out_unlock;
 
-	if (resctrl_is_mbm_enabled()) {
+	if (is_mbm_enabled()) {
 		INIT_DELAYED_WORK(&d->mbm_over, mbm_handle_overflow);
 		mbm_setup_overflow_handler(d, MBM_OVERFLOW_INTERVAL,
 					   RESCTRL_PICK_ANY_CPU);
 	}
 
-	if (resctrl_arch_is_llc_occupancy_enabled())
+	if (is_llc_occupancy_enabled())
 		INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo);
 
 	/*
@@ -4150,12 +4138,12 @@ void resctrl_offline_cpu(unsigned int cpu)
 
 	d = get_domain_from_cpu(cpu, l3);
 	if (d) {
-		if (resctrl_is_mbm_enabled() && cpu == d->mbm_work_cpu) {
+		if (is_mbm_enabled() && cpu == d->mbm_work_cpu) {
 			cancel_delayed_work(&d->mbm_over);
 			mbm_setup_overflow_handler(d, 0, cpu);
 		}
-		if (resctrl_arch_is_llc_occupancy_enabled() &&
-		    cpu == d->cqm_work_cpu && has_busy_rmid(d)) {
+		if (is_llc_occupancy_enabled() && cpu == d->cqm_work_cpu &&
+		    has_busy_rmid(d)) {
 			cancel_delayed_work(&d->cqm_limbo);
 			cqm_setup_limbo_handler(d, 0, cpu);
 		}
-- 
Gitee


From 380617913fe686de513e5e866b57b07d677f2fe3 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 144/280] anolis: Revert "x86/resctrl: Stop using the
 for_each_*_rdt_resource() walkers"

ANBZ: #31045

This reverts commit 4e298aef7263f11d34142733dac1f84600421a65.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c |  7 +-----
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 30 ++++-------------------
 2 files changed, 6 insertions(+), 31 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index f2315a50ea4f..884b88e25141 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -840,7 +840,6 @@ bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm
 bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
 {
 	cpumask_var_t cpu_with_psl;
-	enum resctrl_res_level i;
 	struct rdt_resource *r;
 	struct rdt_domain *d_i;
 	bool ret = false;
@@ -855,11 +854,7 @@ bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
 	 * First determine which cpus have pseudo-locked regions
 	 * associated with them.
 	 */
-	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
-		r = resctrl_arch_get_resource(i);
-		if (!r->alloc_capable)
-			continue;
-
+	for_each_alloc_capable_rdt_resource(r) {
 		list_for_each_entry(d_i, &r->domains, list) {
 			if (d_i->plr)
 				cpumask_or(cpu_with_psl, cpu_with_psl,
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 3f16e7854411..e736e4d20f63 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -98,17 +98,12 @@ void rdt_last_cmd_printf(const char *fmt, ...)
 
 void rdt_staged_configs_clear(void)
 {
-	enum resctrl_res_level i;
 	struct rdt_resource *r;
 	struct rdt_domain *dom;
 
 	lockdep_assert_held(&rdtgroup_mutex);
 
-	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
-		r = resctrl_arch_get_resource(i);
-		if (!r->alloc_capable)
-			continue;
-
+	for_each_alloc_capable_rdt_resource(r) {
 		list_for_each_entry(dom, &r->domains, list)
 			memset(dom->staged_config, 0, sizeof(dom->staged_config));
 	}
@@ -2186,7 +2181,6 @@ static int rdtgroup_mkdir_info_resdir(void *priv, char *name,
 
 static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
 {
-	enum resctrl_res_level i;
 	struct resctrl_schema *s;
 	struct rdt_resource *r;
 	unsigned long fflags;
@@ -2211,12 +2205,8 @@ static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
 			goto out_destroy;
 	}
 
-	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
-		r = resctrl_arch_get_resource(i);
-		if (!r->mon_capable)
-			continue;
-
-		fflags =  r->fflags | RFTYPE_MON_INFO;
+	for_each_mon_capable_rdt_resource(r) {
+		fflags = r->fflags | RFTYPE_MON_INFO;
 		sprintf(name, "%s_MON", r->name);
 		ret = rdtgroup_mkdir_info_resdir(r, name, fflags);
 		if (ret)
@@ -2625,15 +2615,10 @@ static int schemata_list_add(struct rdt_resource *r, enum resctrl_conf_type type
 
 static int schemata_list_create(void)
 {
-	enum resctrl_res_level i;
 	struct rdt_resource *r;
 	int ret = 0;
 
-	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
-		r = resctrl_arch_get_resource(i);
-		if (!r->alloc_capable)
-			continue;
-
+	for_each_alloc_capable_rdt_resource(r) {
 		if (resctrl_arch_get_cdp_enabled(r->rid)) {
 			ret = schemata_list_add(r, CDP_CODE);
 			if (ret)
@@ -3181,7 +3166,6 @@ static int mkdir_mondata_all(struct kernfs_node *parent_kn,
 			     struct rdtgroup *prgrp,
 			     struct kernfs_node **dest_kn)
 {
-	enum resctrl_res_level i;
 	struct rdt_resource *r;
 	struct kernfs_node *kn;
 	int ret;
@@ -3200,11 +3184,7 @@ static int mkdir_mondata_all(struct kernfs_node *parent_kn,
 	 * Create the subdirectories for each domain. Note that all events
 	 * in a domain like L3 are grouped into a resource whose domain is L3
 	 */
-	for (i = 0; i < RDT_NUM_RESOURCES; i++) {
-		r = resctrl_arch_get_resource(i);
-		if (!r->mon_capable)
-			continue;
-
+	for_each_mon_capable_rdt_resource(r) {
 		ret = mkdir_mondata_subdir_alldom(kn, r, prgrp);
 		if (ret)
 			goto out_destroy;
-- 
Gitee


From 11b6adf80f11053b74ff1c2efecfffc32bc8f682 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 145/280] anolis: Revert "x86/resctrl: Move
 max_{name,data}_width into resctrl code"

ANBZ: #31045

This reverts commit f850b8a72a994977c823b6b906df2278f017c1ef.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     | 22 ++++++++++++++++++++++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 12 ------------
 2 files changed, 22 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 7242d15d4806..bafd289dd4b0 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -44,6 +44,12 @@ static DEFINE_MUTEX(domain_list_lock);
  */
 DEFINE_PER_CPU(struct resctrl_pqr_state, pqr_state);
 
+/*
+ * Used to store the max resource name width and max resource data width
+ * to display the schemata in a tabular format
+ */
+int max_name_width, max_data_width;
+
 /*
  * Global boolean for rdt_alloc which is true if any
  * resource allocation is enabled.
@@ -642,6 +648,20 @@ static int resctrl_arch_offline_cpu(unsigned int cpu)
 	return 0;
 }
 
+/*
+ * Choose a width for the resource name and resource data based on the
+ * resource that has widest name and cbm.
+ */
+static __init void rdt_init_padding(void)
+{
+	struct rdt_resource *r;
+
+	for_each_alloc_capable_rdt_resource(r) {
+		if (r->data_width > max_data_width)
+			max_data_width = r->data_width;
+	}
+}
+
 enum {
 	RDT_FLAG_CMT,
 	RDT_FLAG_MBM_TOTAL,
@@ -943,6 +963,8 @@ static int __init resctrl_arch_late_init(void)
 	if (!get_rdt_resources())
 		return -ENODEV;
 
+	rdt_init_padding();
+
 	state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
 				  "x86/resctrl/cat:online:",
 				  resctrl_arch_online_cpu,
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index e736e4d20f63..6cf4ebe9c058 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -58,12 +58,6 @@ static struct kernfs_node *kn_mongrp;
 /* Kernel fs node for "mon_data" directory under root */
 static struct kernfs_node *kn_mondata;
 
-/*
- * Used to store the max resource name width and max resource data width
- * to display the schemata in a tabular format
- */
-int max_name_width, max_data_width;
-
 static struct seq_buf last_cmd_status;
 static char last_cmd_status_buf[512];
 
@@ -2601,12 +2595,6 @@ static int schemata_list_add(struct rdt_resource *r, enum resctrl_conf_type type
 	if (cl > max_name_width)
 		max_name_width = cl;
 
-	/*
-	 * Choose a width for the resource data based on the resource that has
-	 * widest name and cbm.
-	 */
-	max_data_width = max(max_data_width, r->data_width);
-
 	INIT_LIST_HEAD(&s->list);
 	list_add(&s->list, &resctrl_schema_all);
 
-- 
Gitee


From 64a7b70bafe3b04aca2be8366178ca628fa2181a Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 146/280] anolis: Revert "x86/resctrl: Move monitor exit work
 to a restrl exit call"

ANBZ: #31045

This reverts commit bc54ca1adf49160278c3912d3312d2a97aaa299d.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     |  5 +++++
 arch/x86/kernel/cpu/resctrl/internal.h |  2 +-
 arch/x86/kernel/cpu/resctrl/monitor.c  | 12 ++++--------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |  2 --
 4 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index bafd289dd4b0..e5143f8af919 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -992,9 +992,14 @@ late_initcall(resctrl_arch_late_init);
 
 static void __exit resctrl_arch_exit(void)
 {
+	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+
 	cpuhp_remove_state(rdt_online);
 
 	resctrl_exit();
+
+	if (r->mon_capable)
+		rdt_put_mon_l3_config();
 }
 
 __exitcall(resctrl_arch_exit);
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 01fcd4ef26ca..7a0c74779c53 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -533,7 +533,7 @@ void closid_free(int closid);
 int alloc_rmid(u32 closid);
 void free_rmid(u32 closid, u32 rmid);
 int rdt_get_mon_l3_config(struct rdt_resource *r);
-void __exit resctrl_mon_resource_exit(void);
+void __exit rdt_put_mon_l3_config(void);
 bool __init rdt_cpu_has(int flag);
 void mon_event_count(void *info);
 int rdtgroup_mondata_show(struct seq_file *m, void *arg);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 2a1cbd4de6ee..929ec1430b45 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -954,12 +954,10 @@ static int dom_data_init(struct rdt_resource *r)
 	return err;
 }
 
-static void __exit dom_data_exit(struct rdt_resource *r)
+static void __exit dom_data_exit(void)
 {
-	if (!r->mon_capable)
-		return;
-
 	mutex_lock(&rdtgroup_mutex);
+
 	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
 		kfree(closid_num_dirty_rmid);
 		closid_num_dirty_rmid = NULL;
@@ -1076,11 +1074,9 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 	return 0;
 }
 
-void __exit resctrl_mon_resource_exit(void)
+void __exit rdt_put_mon_l3_config(void)
 {
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-
-	dom_data_exit(r);
+	dom_data_exit();
 }
 
 void __init intel_rdt_mbm_apply_quirk(void)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 6cf4ebe9c058..7a9696f53f2b 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4186,6 +4186,4 @@ void __exit resctrl_exit(void)
 	debugfs_remove_recursive(debugfs_resctrl);
 	unregister_filesystem(&rdt_fs_type);
 	sysfs_remove_mount_point(fs_kobj, "resctrl");
-
-	resctrl_mon_resource_exit();
 }
-- 
Gitee


From 4050ec3b93de9ea314c7190bac6d403e3e3cd854 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 147/280] anolis: Revert "x86/resctrl: Move monitor init work
 to a resctrl init call"

ANBZ: #31045

This reverts commit f000abf1c27606112309393c6868c2b553562124.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h |  1 -
 arch/x86/kernel/cpu/resctrl/monitor.c  | 24 +++++++-----------------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |  4 ----
 3 files changed, 7 insertions(+), 22 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 7a0c74779c53..031948322eab 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -540,7 +540,6 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg);
 void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 		    struct rdt_domain *d, struct rdtgroup *rdtgrp,
 		    int evtid, int first);
-int resctrl_mon_resource_init(void);
 void mbm_setup_overflow_handler(struct rdt_domain *dom,
 				unsigned long delay_ms,
 				int exclude_cpu);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 929ec1430b45..06565153ceb2 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1003,28 +1003,12 @@ static void l3_mon_evt_init(struct rdt_resource *r)
 		list_add_tail(&mbm_local_event.list, &r->evt_list);
 }
 
-int resctrl_mon_resource_init(void)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	int ret;
-
-	if (!r->mon_capable)
-		return 0;
-
-	ret = dom_data_init(r);
-	if (ret)
-		return ret;
-
-	l3_mon_evt_init(r);
-
-	return 0;
-}
-
 int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 {
 	unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	unsigned int threshold;
+	int ret;
 
 	resctrl_rmid_realloc_limit = boot_cpu_data.x86_cache_size * 1024;
 	hw_res->mon_scale = boot_cpu_data.x86_cache_occ_scale;
@@ -1052,6 +1036,10 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 	 */
 	resctrl_rmid_realloc_threshold = resctrl_arch_round_mon_val(threshold);
 
+	ret = dom_data_init(r);
+	if (ret)
+		return ret;
+
 	if (rdt_cpu_has(X86_FEATURE_BMEC)) {
 		u32 eax, ebx, ecx, edx;
 
@@ -1069,6 +1057,8 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 		}
 	}
 
+	l3_mon_evt_init(r);
+
 	r->mon_capable = true;
 
 	return 0;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 7a9696f53f2b..13c24cb18d76 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4138,10 +4138,6 @@ int __init resctrl_init(void)
 
 	rdtgroup_setup_default();
 
-	ret = resctrl_mon_resource_init();
-	if (ret)
-		return ret;
-
 	ret = sysfs_create_mount_point(fs_kobj, "resctrl");
 	if (ret)
 		return ret;
-- 
Gitee


From eeb4c0621170210af7e77002facf354c04f6127c Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 148/280] anolis: Revert "x86/resctrl: Add a resctrl helper to
 reset all the resources"

ANBZ: #31045

This reverts commit e460a81ab44a15d58743f9f2de0c0ae22eef3bf0.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h         |  2 --
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 16 +++++-----------
 2 files changed, 5 insertions(+), 13 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 5f6a5375bb4a..f61382258743 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -15,8 +15,6 @@
  */
 #define X86_RESCTRL_EMPTY_CLOSID         ((u32)~0)
 
-void resctrl_arch_reset_resources(void);
-
 /**
  * struct resctrl_pqr_state - State cache for the PQR MSR
  * @cur_rmid:		The cached Resource Monitoring ID
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 13c24cb18d76..1a49c9918f8d 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2859,14 +2859,6 @@ static int reset_all_ctrls(struct rdt_resource *r)
 	return 0;
 }
 
-void resctrl_arch_reset_resources(void)
-{
-	struct rdt_resource *r;
-
-	for_each_capable_rdt_resource(r)
-		reset_all_ctrls(r);
-}
-
 /*
  * Move tasks from one to the other group. If @from is NULL, then all tasks
  * in the systems are moved unconditionally (used for teardown).
@@ -2976,14 +2968,16 @@ static void rmdir_all_sub(void)
 
 static void rdt_kill_sb(struct super_block *sb)
 {
+	struct rdt_resource *r;
+
 	cpus_read_lock();
 	mutex_lock(&rdtgroup_mutex);
 
 	rdt_disable_ctx();
 
-	/* Put everything back to default values. */
-	resctrl_arch_reset_resources();
-
+	/*Put everything back to default values. */
+	for_each_alloc_capable_rdt_resource(r)
+		reset_all_ctrls(r);
 	rmdir_all_sub();
 	rdt_pseudo_lock_release();
 	rdtgroup_default.mode = RDT_MODE_SHAREABLE;
-- 
Gitee


From b76908d4dafb52c05b3152b482181588527d2bf8 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 149/280] anolis: Revert "x86/resctrl: Move resctrl types to a
 separate header"

ANBZ: #31045

This reverts commit f662c9134df0ff54993bfab8bfbf273f306d6796.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 MAINTAINERS                            |  1 -
 arch/x86/kernel/cpu/resctrl/internal.h | 24 +++++++++
 include/linux/resctrl.h                | 35 ++++++++++++-
 include/linux/resctrl_types.h          | 68 --------------------------
 4 files changed, 58 insertions(+), 70 deletions(-)
 delete mode 100644 include/linux/resctrl_types.h

diff --git a/MAINTAINERS b/MAINTAINERS
index cde0fe482aae..85d4f1549af6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18204,7 +18204,6 @@ S:	Supported
 F:	Documentation/arch/x86/resctrl*
 F:	arch/x86/include/asm/resctrl.h
 F:	arch/x86/kernel/cpu/resctrl/
-F:	include/linux/resctrl*.h
 F:	tools/testing/selftests/resctrl/
 
 READ-COPY UPDATE (RCU)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 031948322eab..32ade929ea1b 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -32,6 +32,30 @@
  */
 #define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)
 
+/* Reads to Local DRAM Memory */
+#define READS_TO_LOCAL_MEM		BIT(0)
+
+/* Reads to Remote DRAM Memory */
+#define READS_TO_REMOTE_MEM		BIT(1)
+
+/* Non-Temporal Writes to Local Memory */
+#define NON_TEMP_WRITE_TO_LOCAL_MEM	BIT(2)
+
+/* Non-Temporal Writes to Remote Memory */
+#define NON_TEMP_WRITE_TO_REMOTE_MEM	BIT(3)
+
+/* Reads to Local Memory the system identifies as "Slow Memory" */
+#define READS_TO_LOCAL_S_MEM		BIT(4)
+
+/* Reads to Remote Memory the system identifies as "Slow Memory" */
+#define READS_TO_REMOTE_S_MEM		BIT(5)
+
+/* Dirty Victims to All Types of Memory */
+#define DIRTY_VICTIMS_TO_ALL_MEM	BIT(6)
+
+/* Max event bits supported */
+#define MAX_EVT_CONFIG_BITS		GENMASK(6, 0)
+
 /**
  * cpumask_any_housekeeping() - Choose any CPU in @mask, preferring those that
  *			        aren't marked nohz_full
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index b0ee7256e095..c5fcbb524136 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -5,7 +5,6 @@
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/pid.h>
-#include <linux/resctrl_types.h>
 
 /* CLOSID, RMID value used by the default control group */
 #define RESCTRL_RESERVED_CLOSID		0
@@ -25,6 +24,40 @@ int proc_resctrl_show(struct seq_file *m,
 /* max value for struct rdt_domain's mbps_val */
 #define MBA_MAX_MBPS   U32_MAX
 
+/**
+ * enum resctrl_conf_type - The type of configuration.
+ * @CDP_NONE:	No prioritisation, both code and data are controlled or monitored.
+ * @CDP_CODE:	Configuration applies to instruction fetches.
+ * @CDP_DATA:	Configuration applies to reads and writes.
+ */
+enum resctrl_conf_type {
+	CDP_NONE,
+	CDP_CODE,
+	CDP_DATA,
+};
+
+enum resctrl_res_level {
+	RDT_RESOURCE_L3,
+	RDT_RESOURCE_L2,
+	RDT_RESOURCE_MBA,
+	RDT_RESOURCE_SMBA,
+
+	/* Must be the last */
+	RDT_NUM_RESOURCES,
+};
+
+#define CDP_NUM_TYPES	(CDP_DATA + 1)
+
+/*
+ * Event IDs, the values match those used to program IA32_QM_EVTSEL before
+ * reading IA32_QM_CTR on RDT systems.
+ */
+enum resctrl_event_id {
+	QOS_L3_OCCUP_EVENT_ID		= 0x01,
+	QOS_L3_MBM_TOTAL_EVENT_ID	= 0x02,
+	QOS_L3_MBM_LOCAL_EVENT_ID	= 0x03,
+};
+
 /**
  * struct resctrl_staged_config - parsed configuration to be applied
  * @new_ctrl:		new ctrl value to be loaded
diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h
deleted file mode 100644
index 4788bd95dac6..000000000000
--- a/include/linux/resctrl_types.h
+++ /dev/null
@@ -1,68 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Copyright (C) 2024 Arm Ltd.
- * Based on arch/x86/kernel/cpu/resctrl/internal.h
- */
-
-#ifndef __LINUX_RESCTRL_TYPES_H
-#define __LINUX_RESCTRL_TYPES_H
-
-/* Reads to Local DRAM Memory */
-#define READS_TO_LOCAL_MEM		BIT(0)
-
-/* Reads to Remote DRAM Memory */
-#define READS_TO_REMOTE_MEM		BIT(1)
-
-/* Non-Temporal Writes to Local Memory */
-#define NON_TEMP_WRITE_TO_LOCAL_MEM	BIT(2)
-
-/* Non-Temporal Writes to Remote Memory */
-#define NON_TEMP_WRITE_TO_REMOTE_MEM	BIT(3)
-
-/* Reads to Local Memory the system identifies as "Slow Memory" */
-#define READS_TO_LOCAL_S_MEM		BIT(4)
-
-/* Reads to Remote Memory the system identifies as "Slow Memory" */
-#define READS_TO_REMOTE_S_MEM		BIT(5)
-
-/* Dirty Victims to All Types of Memory */
-#define DIRTY_VICTIMS_TO_ALL_MEM	BIT(6)
-
-/* Max event bits supported */
-#define MAX_EVT_CONFIG_BITS		GENMASK(6, 0)
-
-/**
- * enum resctrl_conf_type - The type of configuration.
- * @CDP_NONE:	No prioritisation, both code and data are controlled or monitored.
- * @CDP_CODE:	Configuration applies to instruction fetches.
- * @CDP_DATA:	Configuration applies to reads and writes.
- */
-enum resctrl_conf_type {
-	CDP_NONE,
-	CDP_CODE,
-	CDP_DATA,
-};
-
-enum resctrl_res_level {
-	RDT_RESOURCE_L3,
-	RDT_RESOURCE_L2,
-	RDT_RESOURCE_MBA,
-	RDT_RESOURCE_SMBA,
-
-	/* Must be the last */
-	RDT_NUM_RESOURCES,
-};
-
-#define CDP_NUM_TYPES	(CDP_DATA + 1)
-
-/*
- * Event IDs, the values match those used to program IA32_QM_EVTSEL before
- * reading IA32_QM_CTR on RDT systems.
- */
-enum resctrl_event_id {
-	QOS_L3_OCCUP_EVENT_ID		= 0x01,
-	QOS_L3_MBM_TOTAL_EVENT_ID	= 0x02,
-	QOS_L3_MBM_LOCAL_EVENT_ID	= 0x03,
-};
-
-#endif /* __LINUX_RESCTRL_TYPES_H */
-- 
Gitee


From 0875ccabd1c46d170fff9e5bdbee5fe5a2046737 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 150/280] anolis: Revert "x86/resctrl: Wrap
 resctrl_arch_find_domain() around rdt_find_domain()"

ANBZ: #31045

This reverts commit 3e28a3f9a8bb8afe523319c14b1828d7373a677f.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        | 9 ++-------
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 2 +-
 arch/x86/kernel/cpu/resctrl/internal.h    | 2 ++
 include/linux/resctrl.h                   | 2 --
 4 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index e5143f8af919..fd7305ae2121 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -405,8 +405,8 @@ void rdt_ctrl_update(void *arg)
  * caller, return the first domain whose id is bigger than the input id.
  * The domain list is sorted by id in ascending order.
  */
-static struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
-					  struct list_head **pos)
+struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
+				   struct list_head **pos)
 {
 	struct rdt_domain *d;
 	struct list_head *l;
@@ -430,11 +430,6 @@ static struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
 	return NULL;
 }
 
-struct rdt_domain *resctrl_arch_find_domain(struct rdt_resource *r, int id)
-{
-	return rdt_find_domain(r, id, NULL);
-}
-
 static void setup_default_ctrlval(struct rdt_resource *r, u32 *dc)
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index ad9e5516e607..077b4cbaa074 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -623,7 +623,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 	evtid = md.u.evtid;
 
 	r = resctrl_arch_get_resource(resid);
-	d = resctrl_arch_find_domain(r, domid);
+	d = rdt_find_domain(r, domid, NULL);
 	if (IS_ERR_OR_NULL(d)) {
 		ret = -ENOENT;
 		goto out;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 32ade929ea1b..7c073298aabf 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -533,6 +533,8 @@ void rdtgroup_kn_unlock(struct kernfs_node *kn);
 int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name);
 int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
 			     umode_t mask);
+struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
+				   struct list_head **pos);
 ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 				char *buf, size_t nbytes, loff_t off);
 int rdtgroup_schemata_show(struct kernfs_open_file *of,
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index c5fcbb524136..f6a4b75f8122 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -233,8 +233,6 @@ void resctrl_arch_sync_cpu_defaults(void *info);
 
 /* The number of closid supported by this resource regardless of CDP */
 u32 resctrl_arch_get_num_closid(struct rdt_resource *r);
-
-struct rdt_domain *resctrl_arch_find_domain(struct rdt_resource *r, int id);
 int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid);
 
 /*
-- 
Gitee


From a86db323ddb00815b299300666a14ebb3f992a83 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:17 -0800
Subject: [PATCH 151/280] anolis: Revert "x86/resctrl: Export resctrl fs's init
 function"

ANBZ: #31045

This reverts commit 150ff37f24ddca2d34dff83890f7c432600fdeef.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     | 12 ++++++------
 arch/x86/kernel/cpu/resctrl/internal.h |  3 +++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |  8 ++++----
 include/linux/resctrl.h                |  3 ---
 4 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index fd7305ae2121..ad5ab8cfa455 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -942,7 +942,7 @@ void resctrl_cpu_detect(struct cpuinfo_x86 *c)
 	}
 }
 
-static int __init resctrl_arch_late_init(void)
+static int __init resctrl_late_init(void)
 {
 	struct rdt_resource *r;
 	int state, ret;
@@ -967,7 +967,7 @@ static int __init resctrl_arch_late_init(void)
 	if (state < 0)
 		return state;
 
-	ret = resctrl_init();
+	ret = rdtgroup_init();
 	if (ret) {
 		cpuhp_remove_state(state);
 		return ret;
@@ -983,18 +983,18 @@ static int __init resctrl_arch_late_init(void)
 	return 0;
 }
 
-late_initcall(resctrl_arch_late_init);
+late_initcall(resctrl_late_init);
 
-static void __exit resctrl_arch_exit(void)
+static void __exit resctrl_exit(void)
 {
 	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
 
 	cpuhp_remove_state(rdt_online);
 
-	resctrl_exit();
+	rdtgroup_exit();
 
 	if (r->mon_capable)
 		rdt_put_mon_l3_config();
 }
 
-__exitcall(resctrl_arch_exit);
+__exitcall(resctrl_exit);
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 7c073298aabf..9048bd32e86f 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -300,6 +300,9 @@ extern struct list_head rdt_all_groups;
 
 extern int max_name_width, max_data_width;
 
+int __init rdtgroup_init(void);
+void __exit rdtgroup_exit(void);
+
 /**
  * struct rftype - describe each file in the resctrl file system
  * @name:	File name
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 1a49c9918f8d..18f097fce51e 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4116,14 +4116,14 @@ void resctrl_offline_cpu(unsigned int cpu)
 }
 
 /*
- * resctrl_init - resctrl filesystem initialization
+ * rdtgroup_init - rdtgroup initialization
  *
  * Setup resctrl file system including set up root, create mount point,
- * register resctrl filesystem, and initialize files under root directory.
+ * register rdtgroup filesystem, and initialize files under root directory.
  *
  * Return: 0 on success or -errno
  */
-int __init resctrl_init(void)
+int __init rdtgroup_init(void)
 {
 	int ret = 0;
 
@@ -4171,7 +4171,7 @@ int __init resctrl_init(void)
 	return ret;
 }
 
-void __exit resctrl_exit(void)
+void __exit rdtgroup_exit(void)
 {
 	debugfs_remove_recursive(debugfs_resctrl);
 	unregister_filesystem(&rdt_fs_type);
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index f6a4b75f8122..2b79e4159507 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -325,7 +325,4 @@ void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_domain *d);
 extern unsigned int resctrl_rmid_realloc_threshold;
 extern unsigned int resctrl_rmid_realloc_limit;
 
-int __init resctrl_init(void);
-void __exit resctrl_exit(void);
-
 #endif /* _RESCTRL_H */
-- 
Gitee


From 17fa27c1695f456190ea493bd3b941de2ac26ebd Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:18 -0800
Subject: [PATCH 152/280] anolis: Revert "x86/resctrl: Remove rdtgroup from
 update_cpu_closid_rmid()"

ANBZ: #31045

This reverts commit 9cdf4c8262b44a75da0e99fd94aa90b07cb1af17.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 19 ++++---------------
 include/linux/resctrl.h                | 11 -----------
 2 files changed, 4 insertions(+), 26 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 18f097fce51e..5d2c1ce5b6b1 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -341,13 +341,13 @@ static int rdtgroup_cpus_show(struct kernfs_open_file *of,
  * from update_closid_rmid() is protected against __switch_to() because
  * preemption is disabled.
  */
-void resctrl_arch_sync_cpu_defaults(void *info)
+static void update_cpu_closid_rmid(void *info)
 {
-	struct resctrl_cpu_sync *r = info;
+	struct rdtgroup *r = info;
 
 	if (r) {
 		this_cpu_write(pqr_state.default_closid, r->closid);
-		this_cpu_write(pqr_state.default_rmid, r->rmid);
+		this_cpu_write(pqr_state.default_rmid, r->mon.rmid);
 	}
 
 	/*
@@ -362,22 +362,11 @@ void resctrl_arch_sync_cpu_defaults(void *info)
  * Update the PGR_ASSOC MSR on all cpus in @cpu_mask,
  *
  * Per task closids/rmids must have been set up before calling this function.
- * @r may be NULL.
  */
 static void
 update_closid_rmid(const struct cpumask *cpu_mask, struct rdtgroup *r)
 {
-	struct resctrl_cpu_sync defaults;
-	struct resctrl_cpu_sync *defaults_p = NULL;
-
-	if (r) {
-		defaults.closid = r->closid;
-		defaults.rmid = r->mon.rmid;
-		defaults_p = &defaults;
-	}
-
-	on_each_cpu_mask(cpu_mask, resctrl_arch_sync_cpu_defaults, defaults_p,
-			 1);
+	on_each_cpu_mask(cpu_mask, update_cpu_closid_rmid, r, 1);
 }
 
 static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 2b79e4159507..6e87bc95f5ea 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -220,17 +220,6 @@ struct resctrl_schema {
 	u32				num_closid;
 };
 
-struct resctrl_cpu_sync {
-	u32 closid;
-	u32 rmid;
-};
-
-/*
- * Update and re-load this CPUs defaults. Called via IPI, takes a pointer to
- * struct resctrl_cpu_sync, or NULL.
- */
-void resctrl_arch_sync_cpu_defaults(void *info);
-
 /* The number of closid supported by this resource regardless of CDP */
 u32 resctrl_arch_get_num_closid(struct rdt_resource *r);
 int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid);
-- 
Gitee


From fa12938bc6b716566d941206060a26ca891025a6 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:18 -0800
Subject: [PATCH 153/280] anolis: Revert "x86/resctrl: Add helper for setting
 CPU default properties"

ANBZ: #31045

This reverts commit e1345d13f3428c782b44589fff7341233305494c.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h         | 14 +++-----------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 15 +++++----------
 2 files changed, 8 insertions(+), 21 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index f61382258743..12dbd2588ca7 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -4,9 +4,8 @@
 
 #ifdef CONFIG_X86_CPU_RESCTRL
 
-#include <linux/jump_label.h>
-#include <linux/percpu.h>
 #include <linux/sched.h>
+#include <linux/jump_label.h>
 
 /*
  * This value can never be a valid CLOSID, and is used when mapping a
@@ -97,8 +96,8 @@ static inline void resctrl_arch_disable_mon(void)
 static inline void __resctrl_sched_in(struct task_struct *tsk)
 {
 	struct resctrl_pqr_state *state = this_cpu_ptr(&pqr_state);
-	u32 closid = READ_ONCE(state->default_closid);
-	u32 rmid = READ_ONCE(state->default_rmid);
+	u32 closid = state->default_closid;
+	u32 rmid = state->default_rmid;
 	u32 tmp;
 
 	/*
@@ -133,13 +132,6 @@ static inline unsigned int resctrl_arch_round_mon_val(unsigned int val)
 	return val * scale;
 }
 
-static inline void resctrl_arch_set_cpu_default_closid_rmid(int cpu, u32 closid,
-							    u32 rmid)
-{
-	WRITE_ONCE(per_cpu(pqr_state.default_closid, cpu), closid);
-	WRITE_ONCE(per_cpu(pqr_state.default_rmid, cpu), rmid);
-}
-
 static inline void resctrl_arch_set_closid_rmid(struct task_struct *tsk,
 						u32 closid, u32 rmid)
 {
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 5d2c1ce5b6b1..45372b6a6215 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -3623,18 +3623,14 @@ static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
 static int rdtgroup_rmdir_mon(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
 {
 	struct rdtgroup *prdtgrp = rdtgrp->mon.parent;
-	u32 closid, rmid;
 	int cpu;
 
 	/* Give any tasks back to the parent group */
 	rdt_move_group_tasks(rdtgrp, prdtgrp, tmpmask);
 
 	/* Update per cpu rmid of the moved CPUs first */
-	closid = rdtgrp->closid;
-	rmid = prdtgrp->mon.rmid;
 	for_each_cpu(cpu, &rdtgrp->cpu_mask)
-		resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
-
+		per_cpu(pqr_state.default_rmid, cpu) = prdtgrp->mon.rmid;
 	/*
 	 * Update the MSR on moved CPUs and CPUs which have moved
 	 * task running on them.
@@ -3667,7 +3663,6 @@ static int rdtgroup_ctrl_remove(struct rdtgroup *rdtgrp)
 
 static int rdtgroup_rmdir_ctrl(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
 {
-	u32 closid, rmid;
 	int cpu;
 
 	/* Give any tasks back to the default group */
@@ -3678,10 +3673,10 @@ static int rdtgroup_rmdir_ctrl(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
 		   &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);
 
 	/* Update per cpu closid and rmid of the moved CPUs first */
-	closid = rdtgroup_default.closid;
-	rmid = rdtgroup_default.mon.rmid;
-	for_each_cpu(cpu, &rdtgrp->cpu_mask)
-		resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
+	for_each_cpu(cpu, &rdtgrp->cpu_mask) {
+		per_cpu(pqr_state.default_closid, cpu) = rdtgroup_default.closid;
+		per_cpu(pqr_state.default_rmid, cpu) = rdtgroup_default.mon.rmid;
+	}
 
 	/*
 	 * Update the MSR on moved CPUs and CPUs which have moved
-- 
Gitee


From edbc8d3d16de678195106b67df0ee3ccdd423be8 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:18 -0800
Subject: [PATCH 154/280] anolis: Revert "x86/resctrl: Move ctrlval string
 parsing policy away from the arch code"

ANBZ: #31045

This reverts commit 77777ccf69365818c8dd201a5ec867e87c5cdad8.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        |  4 ++++
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 28 ++++-------------------
 arch/x86/kernel/cpu/resctrl/internal.h    | 10 ++++++++
 include/linux/resctrl.h                   |  7 ++++++
 4 files changed, 26 insertions(+), 23 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index ad5ab8cfa455..0b38d92d1249 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -75,6 +75,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 			.name			= "L3",
 			.cache_level		= 3,
 			.domains		= domain_init(RDT_RESOURCE_L3),
+			.parse_ctrlval		= parse_cbm,
 			.format_str		= "%d=%0*x",
 			.fflags			= RFTYPE_RES_CACHE,
 		},
@@ -88,6 +89,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 			.name			= "L2",
 			.cache_level		= 2,
 			.domains		= domain_init(RDT_RESOURCE_L2),
+			.parse_ctrlval		= parse_cbm,
 			.format_str		= "%d=%0*x",
 			.fflags			= RFTYPE_RES_CACHE,
 		},
@@ -101,6 +103,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 			.name			= "MB",
 			.cache_level		= 3,
 			.domains		= domain_init(RDT_RESOURCE_MBA),
+			.parse_ctrlval		= parse_bw,
 			.format_str		= "%d=%*u",
 			.fflags			= RFTYPE_RES_MB,
 		},
@@ -112,6 +115,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 			.name			= "SMBA",
 			.cache_level		= 3,
 			.domains		= domain_init(RDT_RESOURCE_SMBA),
+			.parse_ctrlval		= parse_bw,
 			.format_str		= "%d=%*u",
 			.fflags			= RFTYPE_RES_MB,
 		},
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 077b4cbaa074..e2634a3263a6 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -23,15 +23,6 @@
 
 #include "internal.h"
 
-struct rdt_parse_data {
-	struct rdtgroup		*rdtgrp;
-	char			*buf;
-};
-
-typedef int (ctrlval_parser_t)(struct rdt_parse_data *data,
-			       struct resctrl_schema *s,
-			       struct rdt_domain *d);
-
 /*
  * Check whether MBA bandwidth percentage value is correct. The value is
  * checked against the minimum and max bandwidth values specified by the
@@ -73,8 +64,8 @@ static bool bw_validate(char *buf, u32 *data, struct rdt_resource *r)
 	return true;
 }
 
-static int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
-		    struct rdt_domain *d)
+int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
+	     struct rdt_domain *d)
 {
 	struct resctrl_staged_config *cfg;
 	u32 closid = data->rdtgrp->closid;
@@ -152,8 +143,8 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
  * Read one cache bit mask (hex). Check that it is valid for the current
  * resource type.
  */
-static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
-		     struct rdt_domain *d)
+int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
+	      struct rdt_domain *d)
 {
 	struct rdtgroup *rdtgrp = data->rdtgrp;
 	struct resctrl_staged_config *cfg;
@@ -209,14 +200,6 @@ static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 	return 0;
 }
 
-static ctrlval_parser_t *get_parser(struct rdt_resource *res)
-{
-	if (res->fflags & RFTYPE_RES_CACHE)
-		return &parse_cbm;
-	else
-		return &parse_bw;
-}
-
 /*
  * For each domain in this resource we expect to find a series of:
  *	id=mask
@@ -226,7 +209,6 @@ static ctrlval_parser_t *get_parser(struct rdt_resource *res)
 static int parse_line(char *line, struct resctrl_schema *s,
 		      struct rdtgroup *rdtgrp)
 {
-	ctrlval_parser_t *parse_ctrlval = get_parser(s->res);
 	enum resctrl_conf_type t = s->conf_type;
 	struct resctrl_staged_config *cfg;
 	struct rdt_resource *r = s->res;
@@ -258,7 +240,7 @@ static int parse_line(char *line, struct resctrl_schema *s,
 		if (d->id == dom_id) {
 			data.buf = dom;
 			data.rdtgrp = rdtgrp;
-			if (parse_ctrlval(&data, s, d))
+			if (r->parse_ctrlval(&data, s, d))
 				return -EINVAL;
 			if (rdtgrp->mode ==  RDT_MODE_PSEUDO_LOCKSETUP) {
 				cfg = &d->staged_config[t];
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 9048bd32e86f..65990def6c79 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -413,6 +413,11 @@ static inline bool is_mbm_event(int e)
 		e <= QOS_L3_MBM_LOCAL_EVENT_ID);
 }
 
+struct rdt_parse_data {
+	struct rdtgroup		*rdtgrp;
+	char			*buf;
+};
+
 /**
  * struct rdt_hw_resource - arch private attributes of a resctrl resource
  * @r_resctrl:		Attributes of the resource used directly by resctrl.
@@ -450,6 +455,11 @@ static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r
 	return container_of(r, struct rdt_hw_resource, r_resctrl);
 }
 
+int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
+	      struct rdt_domain *d);
+int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
+	     struct rdt_domain *d);
+
 extern struct mutex rdtgroup_mutex;
 
 extern struct rdt_hw_resource rdt_resources_all[];
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 6e87bc95f5ea..168cc9510069 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -157,6 +157,9 @@ struct resctrl_membw {
 	u32				*mb_map;
 };
 
+struct rdt_parse_data;
+struct resctrl_schema;
+
 /**
  * struct rdt_resource - attributes of a resctrl resource
  * @rid:		The index of the resource
@@ -171,6 +174,7 @@ struct resctrl_membw {
  * @data_width:		Character width of data when displaying
  * @default_ctrl:	Specifies default cache cbm or memory B/W percent.
  * @format_str:		Per resource format string to show domain value
+ * @parse_ctrlval:	Per resource function pointer to parse control values
  * @evt_list:		List of monitoring events
  * @fflags:		flags to choose base and info files
  * @cdp_capable:	Is the CDP feature available on this resource
@@ -188,6 +192,9 @@ struct rdt_resource {
 	int			data_width;
 	u32			default_ctrl;
 	const char		*format_str;
+	int			(*parse_ctrlval)(struct rdt_parse_data *data,
+						 struct resctrl_schema *s,
+						 struct rdt_domain *d);
 	struct list_head	evt_list;
 	unsigned long		fflags;
 	bool			cdp_capable;
-- 
Gitee


From 4d8f18f6e79a3dff382dbacfc726b3b599c7c17a Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:18 -0800
Subject: [PATCH 155/280] anolis: Revert "x86/resctrl: Add a helper to avoid
 reaching into the arch code resource list"

ANBZ: #31045

This reverts commit 7fe72eac6e5f65dd5824baf5a7e7109622c2dc8f.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        | 10 +---------
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  2 +-
 arch/x86/kernel/cpu/resctrl/internal.h    | 10 ++++++++++
 arch/x86/kernel/cpu/resctrl/monitor.c     |  8 ++++----
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 15 ++++++++-------
 include/linux/resctrl.h                   | 17 -----------------
 6 files changed, 24 insertions(+), 38 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 0b38d92d1249..cab67782f19d 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -122,14 +122,6 @@ struct rdt_hw_resource rdt_resources_all[] = {
 	},
 };
 
-struct rdt_resource *resctrl_arch_get_resource(enum resctrl_res_level l)
-{
-	if (l >= RDT_NUM_RESOURCES)
-		return NULL;
-
-	return &rdt_resources_all[l].r_resctrl;
-}
-
 /*
  * cache_alloc_hsw_probe() - Have to probe for Intel haswell server CPUs
  * as they do not have CPUID enumeration support for Cache allocation.
@@ -177,7 +169,7 @@ static inline void cache_alloc_hsw_probe(void)
 bool is_mba_sc(struct rdt_resource *r)
 {
 	if (!r)
-		r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+		return rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl.membw.mba_sc;
 
 	/*
 	 * The software controller support is only applicable to MBA resource.
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index e2634a3263a6..8bd717222f0c 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -604,7 +604,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 	domid = md.u.domid;
 	evtid = md.u.evtid;
 
-	r = resctrl_arch_get_resource(resid);
+	r = &rdt_resources_all[resid].r_resctrl;
 	d = rdt_find_domain(r, domid, NULL);
 	if (IS_ERR_OR_NULL(d)) {
 		ret = -ENOENT;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 65990def6c79..c99f26ebe7a6 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -466,6 +466,16 @@ extern struct rdt_hw_resource rdt_resources_all[];
 extern struct rdtgroup rdtgroup_default;
 extern struct dentry *debugfs_resctrl;
 
+enum resctrl_res_level {
+	RDT_RESOURCE_L3,
+	RDT_RESOURCE_L2,
+	RDT_RESOURCE_MBA,
+	RDT_RESOURCE_SMBA,
+
+	/* Must be the last */
+	RDT_NUM_RESOURCES,
+};
+
 static inline struct rdt_resource *resctrl_inc(struct rdt_resource *res)
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(res);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 06565153ceb2..c34a35ec0f03 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -321,7 +321,7 @@ static void limbo_release_entry(struct rmid_entry *entry)
  */
 void __check_limbo(struct rdt_domain *d, bool force_free)
 {
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
 	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
 	struct rmid_entry *entry;
 	u32 idx, cur_idx = 1;
@@ -467,7 +467,7 @@ int alloc_rmid(u32 closid)
 
 static void add_rmid_to_limbo(struct rmid_entry *entry)
 {
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
 	struct rdt_domain *d;
 	u32 idx;
 
@@ -669,7 +669,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
 	if (!is_mbm_local_enabled())
 		return;
 
-	r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+	r_mba = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl;
 
 	closid = rgrp->closid;
 	rmid = rgrp->mon.rmid;
@@ -839,7 +839,7 @@ void mbm_handle_overflow(struct work_struct *work)
 	if (!resctrl_mounted || !resctrl_arch_mon_capable())
 		goto out_unlock;
 
-	r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
 	d = container_of(work, struct rdt_domain, mbm_over.work);
 
 	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 45372b6a6215..1767c1affa60 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2253,7 +2253,7 @@ static void l2_qos_cfg_update(void *arg)
 
 static inline bool is_mba_linear(void)
 {
-	return resctrl_arch_get_resource(RDT_RESOURCE_MBA)->membw.delay_linear;
+	return rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl.membw.delay_linear;
 }
 
 static int set_cache_qos_cfg(int level, bool enable)
@@ -2341,7 +2341,7 @@ static void mba_sc_domain_destroy(struct rdt_resource *r,
  */
 static bool supports_mba_mbps(void)
 {
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl;
 
 	return (is_mbm_local_enabled() &&
 		r->alloc_capable && is_mba_linear());
@@ -2353,7 +2353,7 @@ static bool supports_mba_mbps(void)
  */
 static int set_mba_sc(bool mba_sc)
 {
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl;
 	u32 num_closid = resctrl_arch_get_num_closid(r);
 	struct rdt_domain *d;
 	int i;
@@ -2625,10 +2625,10 @@ static void schemata_list_destroy(void)
 
 static int rdt_get_tree(struct fs_context *fc)
 {
-	struct rdt_resource *l3 = resctrl_arch_get_resource(RDT_RESOURCE_L3);
 	struct rdt_fs_context *ctx = rdt_fc2context(fc);
 	unsigned long flags = RFTYPE_CTRL_BASE;
 	struct rdt_domain *dom;
+	struct rdt_resource *r;
 	int ret;
 
 	cpus_read_lock();
@@ -2701,7 +2701,8 @@ static int rdt_get_tree(struct fs_context *fc)
 		resctrl_mounted = true;
 
 	if (is_mbm_enabled()) {
-		list_for_each_entry(dom, &l3->domains, list)
+		r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+		list_for_each_entry(dom, &r->domains, list)
 			mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL,
 						   RESCTRL_PICK_ANY_CPU);
 	}
@@ -3877,7 +3878,7 @@ static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
 	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2))
 		seq_puts(seq, ",cdpl2");
 
-	if (is_mba_sc(resctrl_arch_get_resource(RDT_RESOURCE_MBA)))
+	if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl))
 		seq_puts(seq, ",mba_MBps");
 
 	if (resctrl_debug)
@@ -4067,7 +4068,7 @@ static void clear_childcpus(struct rdtgroup *r, unsigned int cpu)
 
 void resctrl_offline_cpu(unsigned int cpu)
 {
-	struct rdt_resource *l3 = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	struct rdt_resource *l3 = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
 	struct rdtgroup *rdtgrp;
 	struct rdt_domain *d;
 
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 168cc9510069..a365f67131ec 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -36,16 +36,6 @@ enum resctrl_conf_type {
 	CDP_DATA,
 };
 
-enum resctrl_res_level {
-	RDT_RESOURCE_L3,
-	RDT_RESOURCE_L2,
-	RDT_RESOURCE_MBA,
-	RDT_RESOURCE_SMBA,
-
-	/* Must be the last */
-	RDT_NUM_RESOURCES,
-};
-
 #define CDP_NUM_TYPES	(CDP_DATA + 1)
 
 /*
@@ -200,13 +190,6 @@ struct rdt_resource {
 	bool			cdp_capable;
 };
 
-/*
- * Get the resource that exists at this level. If the level is not supported
- * a dummy/not-capable resource can be returned. Levels >= RDT_NUM_RESOURCES
- * will return NULL.
- */
-struct rdt_resource *resctrl_arch_get_resource(enum resctrl_res_level l);
-
 /**
  * struct resctrl_schema - configuration abilities of a resource presented to
  *			   user-space
-- 
Gitee


From f4ecdf92d40900a22311b93b0a68ddbc309e293d Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:52:18 -0800
Subject: [PATCH 156/280] anolis: Revert "x86/resctrl: Fix allocation of
 cleanest CLOSID on platforms with no monitors"

ANBZ: #31045

This reverts commit 2e35947feee6230863211caf0e366798b9fa7e6a.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 1767c1affa60..011e17efb1a6 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -149,8 +149,7 @@ static int closid_alloc(void)
 
 	lockdep_assert_held(&rdtgroup_mutex);
 
-	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID) &&
-	    is_llc_occupancy_enabled()) {
+	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
 		cleanest_closid = resctrl_find_cleanest_closid();
 		if (cleanest_closid < 0)
 			return cleanest_closid;
-- 
Gitee


From 4813be9a339ed73bb0787fb41436b973c9728ba4 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Sun, 25 Jan 2026 23:55:27 -0800
Subject: [PATCH 157/280] anolis: Revert "anolis: x86/resctrl: Add Hygon QoS
 support"

ANBZ: #31045

This reverts commit b97a96c905dccb5bdf3e050a182411f9153a8b1b.

Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/hygon.c        |  2 --
 arch/x86/kernel/cpu/resctrl/core.c | 10 +++-------
 2 files changed, 3 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/hygon.c b/arch/x86/kernel/cpu/hygon.c
index 6c5a17d7a4a3..1491a111e619 100644
--- a/arch/x86/kernel/cpu/hygon.c
+++ b/arch/x86/kernel/cpu/hygon.c
@@ -18,7 +18,6 @@
 #include <asm/page.h>
 #include <linux/module.h>
 #include <linux/init.h>
-#include <asm/resctrl.h>
 
 #include "cpu.h"
 
@@ -121,7 +120,6 @@ static void bsp_init_hygon(struct cpuinfo_x86 *c)
 			x86_amd_ls_cfg_ssbd_mask = 1ULL << 10;
 		}
 	}
-	resctrl_cpu_detect(c);
 }
 
 static void init_hygon_cap(struct cpuinfo_x86 *c)
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index cab67782f19d..4edc2b9d53c4 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -747,8 +747,7 @@ static __init bool get_mem_config(void)
 
 	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
 		return __get_mem_config_intel(&hw_res->r_resctrl);
-	else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
-		 boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
+	else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
 		return __rdt_get_mem_config_amd(&hw_res->r_resctrl);
 
 	return false;
@@ -899,8 +898,7 @@ static __init void rdt_init_res_defs(void)
 {
 	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
 		rdt_init_res_defs_intel();
-	else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
-		 boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
+	else if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
 		rdt_init_res_defs_amd();
 }
 
@@ -931,9 +929,7 @@ void resctrl_cpu_detect(struct cpuinfo_x86 *c)
 		c->x86_cache_occ_scale = ebx;
 		c->x86_cache_mbm_width_offset = eax & 0xff;
 
-		if ((c->x86_vendor == X86_VENDOR_AMD ||
-		     c->x86_vendor == X86_VENDOR_HYGON) &&
-		    !c->x86_cache_mbm_width_offset)
+		if (c->x86_vendor == X86_VENDOR_AMD && !c->x86_cache_mbm_width_offset)
 			c->x86_cache_mbm_width_offset = MBM_CNTR_WIDTH_OFFSET_AMD;
 	}
 }
-- 
Gitee


From b6e7690793975f20f9da7658e07aa0dddf5d3278 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 22 Mar 2024 11:20:15 -0700
Subject: [PATCH 158/280] Documentation/x86: Document that resctrl bandwidth
 control units are MiB

ANBZ: #31045

commit a8ed59a3a8de2648e69dd5936f5771ac4c92d085 upstream.

The memory bandwidth software controller uses 2^20 units rather than
10^6. See mbm_bw_count() which computes bandwidth using the "SZ_1M"
Linux define for 0x00100000.

Update the documentation to use MiB when describing this feature.
It's too late to fix the mount option "mba_MBps" as that is now an
established user interface.

Intel-SIG: commit a8ed59a3a8de Documentation/x86: Document that resctrl bandwidth control units are MiB.
Incremental backporting patches for Intel RDT on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20240322182016.196544-1-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/resctrl.rst | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index a6279df64a9d..3712d81cb50c 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -45,7 +45,7 @@ mount options are:
 	Enable code/data prioritization in L2 cache allocations.
 "mba_MBps":
 	Enable the MBA Software Controller(mba_sc) to specify MBA
-	bandwidth in MBps
+	bandwidth in MiBps
 "debug":
 	Make debug files accessible. Available debug files are annotated with
 	"Available only with debug option".
@@ -526,7 +526,7 @@ threads start using more cores in an rdtgroup, the actual bandwidth may
 increase or vary although user specified bandwidth percentage is same.
 
 In order to mitigate this and make the interface more user friendly,
-resctrl added support for specifying the bandwidth in MBps as well.  The
+resctrl added support for specifying the bandwidth in MiBps as well.  The
 kernel underneath would use a software feedback mechanism or a "Software
 Controller(mba_sc)" which reads the actual bandwidth using MBM counters
 and adjust the memory bandwidth percentages to ensure::
@@ -573,13 +573,13 @@ Memory b/w domain is L3 cache.
 
 	MB:<cache_id0>=bandwidth0;<cache_id1>=bandwidth1;...
 
-Memory bandwidth Allocation specified in MBps
+Memory bandwidth Allocation specified in MiBps
 ---------------------------------------------
 
 Memory bandwidth domain is L3 cache.
 ::
 
-	MB:<cache_id0>=bw_MBps0;<cache_id1>=bw_MBps1;...
+	MB:<cache_id0>=bw_MiBps0;<cache_id1>=bw_MiBps1;...
 
 Slow Memory Bandwidth Allocation (SMBA)
 ---------------------------------------
-- 
Gitee


From 2bc329fbd7cc633e1c2c837a6eb8a1ef3e8db7ef Mon Sep 17 00:00:00 2001
From: Reinette Chatre <reinette.chatre@intel.com>
Date: Mon, 1 Apr 2024 11:16:39 -0700
Subject: [PATCH 159/280] x86/resctrl: Fix uninitialized memory read when last
 CPU of domain goes offline

ANBZ: #31045

commit c3eeb1ffc6a88af9b002e22be0f70851759be03a upstream.

Tony encountered this OOPS when the last CPU of a domain goes
offline while running a kernel built with CONFIG_NO_HZ_FULL:

    BUG: kernel NULL pointer dereference, address: 0000000000000000
    #PF: supervisor read access in kernel mode
    #PF: error_code(0x0000) - not-present page
    PGD 0
    Oops: 0000 [#1] PREEMPT SMP NOPTI
    ...
    RIP: 0010:__find_nth_andnot_bit+0x66/0x110
    ...
    Call Trace:
     <TASK>
     ? __die()
     ? page_fault_oops()
     ? exc_page_fault()
     ? asm_exc_page_fault()
     cpumask_any_housekeeping()
     mbm_setup_overflow_handler()
     resctrl_offline_cpu()
     resctrl_arch_offline_cpu()
     cpuhp_invoke_callback()
     cpuhp_thread_fun()
     smpboot_thread_fn()
     kthread()
     ret_from_fork()
     ret_from_fork_asm()
     </TASK>

The NULL pointer dereference is encountered while searching for another
online CPU in the domain (of which there are none) that can be used to
run the MBM overflow handler.

Because the kernel is configured with CONFIG_NO_HZ_FULL the search for
another CPU (in its effort to prefer those CPUs that aren't marked
nohz_full) consults the mask representing the nohz_full CPUs,
tick_nohz_full_mask. On a kernel with CONFIG_CPUMASK_OFFSTACK=y
tick_nohz_full_mask is not allocated unless the kernel is booted with
the "nohz_full=" parameter and because of that any access to
tick_nohz_full_mask needs to be guarded with tick_nohz_full_enabled().

Replace the IS_ENABLED(CONFIG_NO_HZ_FULL) with tick_nohz_full_enabled().
The latter ensures tick_nohz_full_mask can be accessed safely and can be
used whether kernel is built with CONFIG_NO_HZ_FULL enabled or not.

[ Use Ingo's suggestion that combines the two NO_HZ checks into one. ]

Intel-SIG: commit c3eeb1ffc6a8 x86/resctrl: Fix uninitialized memory read when last CPU of domain goes offline.
Incremental backporting patches for Intel RDT on Intel Xeon platform.

Fixes: a4846aaf3945 ("x86/resctrl: Add cpumask_any_housekeeping() for limbo/overflow")
Reported-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/ff8dfc8d3dcb04b236d523d1e0de13d2ef585223.1711993956.git.reinette.chatre@intel.com
Closes: https://lore.kernel.org/lkml/ZgIFT5gZgIQ9A9G7@agluck-desk3/
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index c99f26ebe7a6..1a8687f8073a 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -78,7 +78,8 @@ cpumask_any_housekeeping(const struct cpumask *mask, int exclude_cpu)
 	else
 		cpu = cpumask_any_but(mask, exclude_cpu);
 
-	if (!IS_ENABLED(CONFIG_NO_HZ_FULL))
+	/* Only continue if tick_nohz_full_mask has been initialized. */
+	if (!tick_nohz_full_enabled())
 		return cpu;
 
 	/* If the CPU picked isn't marked nohz_full nothing more needs doing. */
-- 
Gitee


From dfc28e6074e9dd13eef01fc351beff7a65c17a15 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Wed, 24 Apr 2024 11:15:14 -0700
Subject: [PATCH 160/280] x86/resctrl: Switch to new Intel CPU model defines

ANBZ: #31045

commit db99675e4338e97e1469aeae5564e8242bd8fd6a upstream.

New CPU #defines encode vendor and family as well as model.

  [ bp: Squash two resctrl patches into one. ]

Intel-SIG: commit db99675e4338 x86/resctrl: Switch to new Intel CPU model defines
Incremental backporting patches for Intel RDT on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/all/20240424181514.41848-1-tony.luck%40intel.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        | 10 +++++-----
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 22 +++++++++++-----------
 2 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 4edc2b9d53c4..1cf38d837263 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -22,7 +22,7 @@
 #include <linux/cacheinfo.h>
 #include <linux/cpuhotplug.h>
 
-#include <asm/intel-family.h>
+#include <asm/cpu_device_id.h>
 #include <asm/resctrl.h>
 #include "internal.h"
 
@@ -821,18 +821,18 @@ static __init bool get_rdt_mon_resources(void)
 
 static __init void __check_quirks_intel(void)
 {
-	switch (boot_cpu_data.x86_model) {
-	case INTEL_FAM6_HASWELL_X:
+	switch (boot_cpu_data.x86_vfm) {
+	case INTEL_HASWELL_X:
 		if (!rdt_options[RDT_FLAG_L3_CAT].force_off)
 			cache_alloc_hsw_probe();
 		break;
-	case INTEL_FAM6_SKYLAKE_X:
+	case INTEL_SKYLAKE_X:
 		if (boot_cpu_data.x86_stepping <= 4)
 			set_rdt_options("!cmt,!mbmtotal,!mbmlocal,!l3cat");
 		else
 			set_rdt_options("!l3cat");
 		fallthrough;
-	case INTEL_FAM6_BROADWELL_X:
+	case INTEL_BROADWELL_X:
 		intel_rdt_mbm_apply_quirk();
 		break;
 	}
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 884b88e25141..04584a76ceb4 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -23,7 +23,7 @@
 #include <linux/uaccess.h>
 
 #include <asm/cacheflush.h>
-#include <asm/intel-family.h>
+#include <asm/cpu_device_id.h>
 #include <asm/resctrl.h>
 #include <asm/perf_event.h>
 
@@ -88,8 +88,8 @@ static u64 get_prefetch_disable_bits(void)
 	    boot_cpu_data.x86 != 6)
 		return 0;
 
-	switch (boot_cpu_data.x86_model) {
-	case INTEL_FAM6_BROADWELL_X:
+	switch (boot_cpu_data.x86_vfm) {
+	case INTEL_BROADWELL_X:
 		/*
 		 * SDM defines bits of MSR_MISC_FEATURE_CONTROL register
 		 * as:
@@ -100,8 +100,8 @@ static u64 get_prefetch_disable_bits(void)
 		 * 63:4 Reserved
 		 */
 		return 0xF;
-	case INTEL_FAM6_ATOM_GOLDMONT:
-	case INTEL_FAM6_ATOM_GOLDMONT_PLUS:
+	case INTEL_ATOM_GOLDMONT:
+	case INTEL_ATOM_GOLDMONT_PLUS:
 		/*
 		 * SDM defines bits of MSR_MISC_FEATURE_CONTROL register
 		 * as:
@@ -1084,9 +1084,9 @@ static int measure_l2_residency(void *_plr)
 	 *     L2_HIT   02H
 	 *     L2_MISS  10H
 	 */
-	switch (boot_cpu_data.x86_model) {
-	case INTEL_FAM6_ATOM_GOLDMONT:
-	case INTEL_FAM6_ATOM_GOLDMONT_PLUS:
+	switch (boot_cpu_data.x86_vfm) {
+	case INTEL_ATOM_GOLDMONT:
+	case INTEL_ATOM_GOLDMONT_PLUS:
 		perf_miss_attr.config = X86_CONFIG(.event = 0xd1,
 						   .umask = 0x10);
 		perf_hit_attr.config = X86_CONFIG(.event = 0xd1,
@@ -1123,8 +1123,8 @@ static int measure_l3_residency(void *_plr)
 	 *       MISS      41H
 	 */
 
-	switch (boot_cpu_data.x86_model) {
-	case INTEL_FAM6_BROADWELL_X:
+	switch (boot_cpu_data.x86_vfm) {
+	case INTEL_BROADWELL_X:
 		/* On BDW the hit event counts references, not hits */
 		perf_hit_attr.config = X86_CONFIG(.event = 0x2e,
 						  .umask = 0x4f);
@@ -1142,7 +1142,7 @@ static int measure_l3_residency(void *_plr)
 	 */
 
 	counts.miss_after -= counts.miss_before;
-	if (boot_cpu_data.x86_model == INTEL_FAM6_BROADWELL_X) {
+	if (boot_cpu_data.x86_vfm == INTEL_BROADWELL_X) {
 		/*
 		 * On BDW references and misses are counted, need to adjust.
 		 * Sometimes the "hits" counter is a bit more than the
-- 
Gitee


From 4d63d386ee15d78f4047835b89d67fa0b350f52d Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 8 Mar 2024 13:38:45 -0800
Subject: [PATCH 161/280] x86/resctrl: Pass domain to target CPU

ANBZ: #31045

commit e3ca96e479c91d6ee657d3caa5092a6a3a620f9f upstream.

reset_all_ctrls() and resctrl_arch_update_domains() use on_each_cpu_mask()
to call rdt_ctrl_update() on potentially one CPU from each domain.

But this means rdt_ctrl_update() needs to figure out which domain to
apply changes to. Doing so requires a search of all domains in a resource,
which can only be done safely if cpus_lock is held. Both callers do hold
this lock, but there isn't a way for a function called on another CPU
via IPI to verify this.

Commit

  c0d848fcb09d ("x86/resctrl: Remove lockdep annotation that triggers
  false positive")

removed the incorrect assertions.

Add the target domain to the msr_param structure and call
rdt_ctrl_update() for each domain separately using
smp_call_function_single(). This means that rdt_ctrl_update() doesn't
need to search for the domain and get_domain_from_cpu() can safely
assert that the cpus_lock is held since the remaining callers do not use
IPI.

Intel-SIG: commit e3ca96e479c9 x86/resctrl: Pass domain to target CPU.
Incremental backporting patches for Intel RDT on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
Link: https://lore.kernel.org/r/20240308213846.77075-2-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        | 17 ++++------
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 38 +++++------------------
 arch/x86/kernel/cpu/resctrl/internal.h    |  2 ++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 12 ++-----
 4 files changed, 17 insertions(+), 52 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 1cf38d837263..eb75ad08d47a 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -362,6 +362,8 @@ struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r)
 {
 	struct rdt_domain *d;
 
+	lockdep_assert_cpus_held();
+
 	list_for_each_entry(d, &r->domains, list) {
 		/* Find the domain that contains this CPU */
 		if (cpumask_test_cpu(cpu, &d->cpu_mask))
@@ -378,19 +380,11 @@ u32 resctrl_arch_get_num_closid(struct rdt_resource *r)
 
 void rdt_ctrl_update(void *arg)
 {
+	struct rdt_hw_resource *hw_res;
 	struct msr_param *m = arg;
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(m->res);
-	struct rdt_resource *r = m->res;
-	int cpu = smp_processor_id();
-	struct rdt_domain *d;
 
-	d = get_domain_from_cpu(cpu, r);
-	if (d) {
-		hw_res->msr_update(d, m, r);
-		return;
-	}
-	pr_warn_once("cpu %d not found in any domain for resource %s\n",
-		     cpu, r->name);
+	hw_res = resctrl_to_arch_res(m->res);
+	hw_res->msr_update(m->dom, m, m->res);
 }
 
 /*
@@ -463,6 +457,7 @@ static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
 	hw_dom->ctrl_val = dc;
 	setup_default_ctrlval(r, dc);
 
+	m.dom = d;
 	m.low = 0;
 	m.high = hw_res->num_closid;
 	hw_res->msr_update(d, &m, r);
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 8bd717222f0c..15d916449e47 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -277,22 +277,6 @@ static u32 get_config_index(u32 closid, enum resctrl_conf_type type)
 	}
 }
 
-static bool apply_config(struct rdt_hw_domain *hw_dom,
-			 struct resctrl_staged_config *cfg, u32 idx,
-			 cpumask_var_t cpu_mask)
-{
-	struct rdt_domain *dom = &hw_dom->d_resctrl;
-
-	if (cfg->new_ctrl != hw_dom->ctrl_val[idx]) {
-		cpumask_set_cpu(cpumask_any(&dom->cpu_mask), cpu_mask);
-		hw_dom->ctrl_val[idx] = cfg->new_ctrl;
-
-		return true;
-	}
-
-	return false;
-}
-
 int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
 			    u32 closid, enum resctrl_conf_type t, u32 cfg_val)
 {
@@ -307,6 +291,7 @@ int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
 	hw_dom->ctrl_val[idx] = cfg_val;
 
 	msr_param.res = r;
+	msr_param.dom = d;
 	msr_param.low = idx;
 	msr_param.high = idx + 1;
 	hw_res->msr_update(d, &msr_param, r);
@@ -320,48 +305,39 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 	struct rdt_hw_domain *hw_dom;
 	struct msr_param msr_param;
 	enum resctrl_conf_type t;
-	cpumask_var_t cpu_mask;
 	struct rdt_domain *d;
 	u32 idx;
 
 	/* Walking r->domains, ensure it can't race with cpuhp */
 	lockdep_assert_cpus_held();
 
-	if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
-		return -ENOMEM;
-
-	msr_param.res = NULL;
 	list_for_each_entry(d, &r->domains, list) {
 		hw_dom = resctrl_to_arch_dom(d);
+		msr_param.res = NULL;
 		for (t = 0; t < CDP_NUM_TYPES; t++) {
 			cfg = &hw_dom->d_resctrl.staged_config[t];
 			if (!cfg->have_new_ctrl)
 				continue;
 
 			idx = get_config_index(closid, t);
-			if (!apply_config(hw_dom, cfg, idx, cpu_mask))
+			if (cfg->new_ctrl == hw_dom->ctrl_val[idx])
 				continue;
+			hw_dom->ctrl_val[idx] = cfg->new_ctrl;
 
 			if (!msr_param.res) {
 				msr_param.low = idx;
 				msr_param.high = msr_param.low + 1;
 				msr_param.res = r;
+				msr_param.dom = d;
 			} else {
 				msr_param.low = min(msr_param.low, idx);
 				msr_param.high = max(msr_param.high, idx + 1);
 			}
 		}
+		if (msr_param.res)
+			smp_call_function_any(&d->cpu_mask, rdt_ctrl_update, &msr_param, 1);
 	}
 
-	if (cpumask_empty(cpu_mask))
-		goto done;
-
-	/* Update resource control msr on all the CPUs. */
-	on_each_cpu_mask(cpu_mask, rdt_ctrl_update, &msr_param, 1);
-
-done:
-	free_cpumask_var(cpu_mask);
-
 	return 0;
 }
 
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 1a8687f8073a..ab2d315f7a2e 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -379,11 +379,13 @@ static inline struct rdt_hw_domain *resctrl_to_arch_dom(struct rdt_domain *r)
 /**
  * struct msr_param - set a range of MSRs from a domain
  * @res:       The resource to use
+ * @dom:       The domain to update
  * @low:       Beginning index from base MSR
  * @high:      End index
  */
 struct msr_param {
 	struct rdt_resource	*res;
+	struct rdt_domain	*dom;
 	u32			low;
 	u32			high;
 };
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 011e17efb1a6..02f213f1c51c 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2813,16 +2813,12 @@ static int reset_all_ctrls(struct rdt_resource *r)
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	struct rdt_hw_domain *hw_dom;
 	struct msr_param msr_param;
-	cpumask_var_t cpu_mask;
 	struct rdt_domain *d;
 	int i;
 
 	/* Walking r->domains, ensure it can't race with cpuhp */
 	lockdep_assert_cpus_held();
 
-	if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
-		return -ENOMEM;
-
 	msr_param.res = r;
 	msr_param.low = 0;
 	msr_param.high = hw_res->num_closid;
@@ -2834,17 +2830,13 @@ static int reset_all_ctrls(struct rdt_resource *r)
 	 */
 	list_for_each_entry(d, &r->domains, list) {
 		hw_dom = resctrl_to_arch_dom(d);
-		cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
 
 		for (i = 0; i < hw_res->num_closid; i++)
 			hw_dom->ctrl_val[i] = r->default_ctrl;
+		msr_param.dom = d;
+		smp_call_function_any(&d->cpu_mask, rdt_ctrl_update, &msr_param, 1);
 	}
 
-	/* Update CBM on all the CPUs in cpu_mask */
-	on_each_cpu_mask(cpu_mask, rdt_ctrl_update, &msr_param, 1);
-
-	free_cpumask_var(cpu_mask);
-
 	return 0;
 }
 
-- 
Gitee


From d097e030b0a6a82a8dbde7b6015683bfd8850c6e Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 8 Mar 2024 13:38:46 -0800
Subject: [PATCH 162/280] x86/resctrl: Simplify call convention for MSR update
 functions

ANBZ: #31045

commit bd4955d4bc2182ccb660c9c30a4dd7f36feaf943 upstream.

The per-resource MSR update functions cat_wrmsr(), mba_wrmsr_intel(),
and mba_wrmsr_amd() all take three arguments:

  (struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)

struct msr_param contains pointers to both struct rdt_resource and struct
rdt_domain, thus only struct msr_param is necessary.

Pass struct msr_param as a single parameter. Clean up formatting and
fix some fir tree declaration ordering.

No functional change.

Intel-SIG: commit bd4955d4bc21 x86/resctrl: Simplify call convention for MSR update functions.
Incremental backporting patches for Intel RDT on Intel Xeon platform.

Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
Link: https://lore.kernel.org/r/20240308213846.77075-3-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        | 40 +++++++++--------------
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  2 +-
 arch/x86/kernel/cpu/resctrl/internal.h    |  3 +-
 3 files changed, 18 insertions(+), 27 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index eb75ad08d47a..ea829600bcb9 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -56,14 +56,9 @@ int max_name_width, max_data_width;
  */
 bool rdt_alloc_capable;
 
-static void
-mba_wrmsr_intel(struct rdt_domain *d, struct msr_param *m,
-		struct rdt_resource *r);
-static void
-cat_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r);
-static void
-mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m,
-	      struct rdt_resource *r);
+static void mba_wrmsr_intel(struct msr_param *m);
+static void cat_wrmsr(struct msr_param *m);
+static void mba_wrmsr_amd(struct msr_param *m);
 
 #define domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].r_resctrl.domains)
 
@@ -309,12 +304,11 @@ static void rdt_get_cdp_l2_config(void)
 	rdt_get_cdp_config(RDT_RESOURCE_L2);
 }
 
-static void
-mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
+static void mba_wrmsr_amd(struct msr_param *m)
 {
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(m->res);
+	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(m->dom);
 	unsigned int i;
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
 	for (i = m->low; i < m->high; i++)
 		wrmsrl(hw_res->msr_base + i, hw_dom->ctrl_val[i]);
@@ -334,25 +328,22 @@ static u32 delay_bw_map(unsigned long bw, struct rdt_resource *r)
 	return r->default_ctrl;
 }
 
-static void
-mba_wrmsr_intel(struct rdt_domain *d, struct msr_param *m,
-		struct rdt_resource *r)
+static void mba_wrmsr_intel(struct msr_param *m)
 {
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(m->res);
+	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(m->dom);
 	unsigned int i;
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
 	/*  Write the delay values for mba. */
 	for (i = m->low; i < m->high; i++)
-		wrmsrl(hw_res->msr_base + i, delay_bw_map(hw_dom->ctrl_val[i], r));
+		wrmsrl(hw_res->msr_base + i, delay_bw_map(hw_dom->ctrl_val[i], m->res));
 }
 
-static void
-cat_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
+static void cat_wrmsr(struct msr_param *m)
 {
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(m->res);
+	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(m->dom);
 	unsigned int i;
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
 	for (i = m->low; i < m->high; i++)
 		wrmsrl(hw_res->msr_base + i, hw_dom->ctrl_val[i]);
@@ -384,7 +375,7 @@ void rdt_ctrl_update(void *arg)
 	struct msr_param *m = arg;
 
 	hw_res = resctrl_to_arch_res(m->res);
-	hw_res->msr_update(m->dom, m, m->res);
+	hw_res->msr_update(m);
 }
 
 /*
@@ -457,10 +448,11 @@ static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
 	hw_dom->ctrl_val = dc;
 	setup_default_ctrlval(r, dc);
 
+	m.res = r;
 	m.dom = d;
 	m.low = 0;
 	m.high = hw_res->num_closid;
-	hw_res->msr_update(d, &m, r);
+	hw_res->msr_update(&m);
 	return 0;
 }
 
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 15d916449e47..5891fc950f74 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -294,7 +294,7 @@ int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
 	msr_param.dom = d;
 	msr_param.low = idx;
 	msr_param.high = idx + 1;
-	hw_res->msr_update(d, &msr_param, r);
+	hw_res->msr_update(&msr_param);
 
 	return 0;
 }
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index ab2d315f7a2e..f1d926832ec8 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -445,8 +445,7 @@ struct rdt_hw_resource {
 	struct rdt_resource	r_resctrl;
 	u32			num_closid;
 	unsigned int		msr_base;
-	void (*msr_update)	(struct rdt_domain *d, struct msr_param *m,
-				 struct rdt_resource *r);
+	void			(*msr_update)(struct msr_param *m);
 	unsigned int		mon_scale;
 	unsigned int		mbm_width;
 	unsigned int		mbm_cfg_mask;
-- 
Gitee


From 4e6f34e378d959fd331f7797c94a2ecdecbe0da4 Mon Sep 17 00:00:00 2001
From: Haifeng Xu <haifeng.xu@shopee.com>
Date: Mon, 8 Apr 2024 17:23:02 +0800
Subject: [PATCH 163/280] x86/resctrl: Rename pseudo_lock_event.h to trace.h

ANBZ: #31045

commit 87739229485ac724849178eb6c35e38c6161eb77 upstream.

Now only the pseudo-locking part uses tracepoints to do event tracking,
but other parts of resctrl may need new tracepoints. It is unnecessary
to create separate header files and define CREATE_TRACE_POINTS in
different c files which fragments the resctrl tracing.

Therefore, give the resctrl tracepoint header file a generic name to
support its use for tracepoints that are not specific to pseudo-locking.

No functional change.

Intel-SIG: commit 87739229485a x86/resctrl: Rename pseudo_lock_event.h to trace.h.
Incremental backporting patches for Intel RDT on Intel Xeon platform.

Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Haifeng Xu <haifeng.xu@shopee.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20240408092303.26413-2-haifeng.xu@shopee.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c                 | 2 +-
 .../kernel/cpu/resctrl/{pseudo_lock_event.h => trace.h}   | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)
 rename arch/x86/kernel/cpu/resctrl/{pseudo_lock_event.h => trace.h} (86%)

diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 04584a76ceb4..aacf236dfe3b 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -31,7 +31,7 @@
 #include "internal.h"
 
 #define CREATE_TRACE_POINTS
-#include "pseudo_lock_event.h"
+#include "trace.h"
 
 /*
  * The bits needed to disable hardware prefetching varies based on the
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock_event.h b/arch/x86/kernel/cpu/resctrl/trace.h
similarity index 86%
rename from arch/x86/kernel/cpu/resctrl/pseudo_lock_event.h
rename to arch/x86/kernel/cpu/resctrl/trace.h
index 428ebbd4270b..495fb90c8572 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock_event.h
+++ b/arch/x86/kernel/cpu/resctrl/trace.h
@@ -2,8 +2,8 @@
 #undef TRACE_SYSTEM
 #define TRACE_SYSTEM resctrl
 
-#if !defined(_TRACE_PSEUDO_LOCK_H) || defined(TRACE_HEADER_MULTI_READ)
-#define _TRACE_PSEUDO_LOCK_H
+#if !defined(_TRACE_RESCTRL_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_RESCTRL_H
 
 #include <linux/tracepoint.h>
 
@@ -35,9 +35,9 @@ TRACE_EVENT(pseudo_lock_l3,
 	    TP_printk("hits=%llu miss=%llu",
 		      __entry->l3_hits, __entry->l3_miss));
 
-#endif /* _TRACE_PSEUDO_LOCK_H */
+#endif /* _TRACE_RESCTRL_H */
 
 #undef TRACE_INCLUDE_PATH
 #define TRACE_INCLUDE_PATH .
-#define TRACE_INCLUDE_FILE pseudo_lock_event
+#define TRACE_INCLUDE_FILE trace
 #include <trace/define_trace.h>
-- 
Gitee


From dcac921fe7085a8ff2c9da854d50cebf6a1efcf2 Mon Sep 17 00:00:00 2001
From: Haifeng Xu <haifeng.xu@shopee.com>
Date: Mon, 8 Apr 2024 17:23:03 +0800
Subject: [PATCH 164/280] x86/resctrl: Add tracepoint for llc_occupancy
 tracking

ANBZ: #31045

commit 931be446c6cbc15691dd499957e961f4e1d56afb upstream.

In our production environment, after removing monitor groups, those
unused RMIDs get stuck in the limbo list forever because their
llc_occupancy is always larger than the threshold. But the unused RMIDs
can be successfully freed by turning up the threshold.

In order to know how much the threshold should be, perf can be used to
acquire the llc_occupancy of RMIDs in each rdt domain.

Instead of using perf tool to track llc_occupancy and filter the log
manually, it is more convenient for users to use tracepoint to do this
work. So add a new tracepoint that shows the llc_occupancy of busy RMIDs
when scanning the limbo list.

Intel-SIG: commit 931be446c6cb x86/resctrl: Add tracepoint for llc_occupancy tracking.
Incremental backporting patches for Intel RDT on Intel Xeon platform.

Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Suggested-by: James Morse <james.morse@arm.com>
Signed-off-by: Haifeng Xu <haifeng.xu@shopee.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20240408092303.26413-3-haifeng.xu@shopee.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/resctrl.rst    |  6 ++++++
 arch/x86/kernel/cpu/resctrl/monitor.c | 11 +++++++++++
 arch/x86/kernel/cpu/resctrl/trace.h   | 16 ++++++++++++++++
 3 files changed, 33 insertions(+)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 3712d81cb50c..5f26c6267ac7 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -446,6 +446,12 @@ during mkdir.
 max_threshold_occupancy is a user configurable value to determine the
 occupancy at which an RMID can be freed.
 
+The mon_llc_occupancy_limbo tracepoint gives the precise occupancy in bytes
+for a subset of RMID that are not immediately available for allocation.
+This can't be relied on to produce output every second, it may be necessary
+to attempt to create an empty monitor group to force an update. Output may
+only be produced if creation of a control or monitor group fails.
+
 Schemata files - general concepts
 ---------------------------------
 Each line in the file describes one resource. The line starts with
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index c34a35ec0f03..2345e6836593 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -24,6 +24,7 @@
 #include <asm/resctrl.h>
 
 #include "internal.h"
+#include "trace.h"
 
 /**
  * struct rmid_entry - dirty tracking for all RMID.
@@ -354,6 +355,16 @@ void __check_limbo(struct rdt_domain *d, bool force_free)
 			rmid_dirty = true;
 		} else {
 			rmid_dirty = (val >= resctrl_rmid_realloc_threshold);
+
+			/*
+			 * x86's CLOSID and RMID are independent numbers, so the entry's
+			 * CLOSID is an empty CLOSID (X86_RESCTRL_EMPTY_CLOSID). On Arm the
+			 * RMID (PMG) extends the CLOSID (PARTID) space with bits that aren't
+			 * used to select the configuration. It is thus necessary to track both
+			 * CLOSID and RMID because there may be dependencies between them
+			 * on some architectures.
+			 */
+			trace_mon_llc_occupancy_limbo(entry->closid, entry->rmid, d->id, val);
 		}
 
 		if (force_free || !rmid_dirty) {
diff --git a/arch/x86/kernel/cpu/resctrl/trace.h b/arch/x86/kernel/cpu/resctrl/trace.h
index 495fb90c8572..2a506316b303 100644
--- a/arch/x86/kernel/cpu/resctrl/trace.h
+++ b/arch/x86/kernel/cpu/resctrl/trace.h
@@ -35,6 +35,22 @@ TRACE_EVENT(pseudo_lock_l3,
 	    TP_printk("hits=%llu miss=%llu",
 		      __entry->l3_hits, __entry->l3_miss));
 
+TRACE_EVENT(mon_llc_occupancy_limbo,
+	    TP_PROTO(u32 ctrl_hw_id, u32 mon_hw_id, int domain_id, u64 llc_occupancy_bytes),
+	    TP_ARGS(ctrl_hw_id, mon_hw_id, domain_id, llc_occupancy_bytes),
+	    TP_STRUCT__entry(__field(u32, ctrl_hw_id)
+			     __field(u32, mon_hw_id)
+			     __field(int, domain_id)
+			     __field(u64, llc_occupancy_bytes)),
+	    TP_fast_assign(__entry->ctrl_hw_id = ctrl_hw_id;
+			   __entry->mon_hw_id = mon_hw_id;
+			   __entry->domain_id = domain_id;
+			   __entry->llc_occupancy_bytes = llc_occupancy_bytes;),
+	    TP_printk("ctrl_hw_id=%u mon_hw_id=%u domain_id=%d llc_occupancy_bytes=%llu",
+		      __entry->ctrl_hw_id, __entry->mon_hw_id, __entry->domain_id,
+		      __entry->llc_occupancy_bytes)
+	   );
+
 #endif /* _TRACE_RESCTRL_H */
 
 #undef TRACE_INCLUDE_PATH
-- 
Gitee


From afd893b483ffc7648d4900437c7b3bc24e9817d4 Mon Sep 17 00:00:00 2001
From: Dave Martin <Dave.Martin@arm.com>
Date: Tue, 18 Jun 2024 15:01:52 +0100
Subject: [PATCH 165/280] x86/resctrl: Don't try to free nonexistent RMIDs

ANBZ: #31045

commit 739c9765793e5794578a64aab293c58607f1826a upstream.

Commit

  6791e0ea3071 ("x86/resctrl: Access per-rmid structures by index")

adds logic to map individual monitoring groups into a global index space used
for tracking allocated RMIDs.

Attempts to free the default RMID are ignored in free_rmid(), and this works
fine on x86.

With arm64 MPAM, there is a latent bug here however: on platforms with no
monitors exposed through resctrl, each control group still gets a different
monitoring group ID as seen by the hardware, since the CLOSID always forms part
of the monitoring group ID.

This means that when removing a control group, the code may try to free this
group's default monitoring group RMID for real.  If there are no monitors
however, the RMID tracking table rmid_ptrs[] would be a waste of memory and is
never allocated, leading to a splat when free_rmid() tries to dereference the
table.

One option would be to treat RMID 0 as special for every CLOSID, but this would
be ugly since bookkeeping still needs to be done for these monitoring group IDs
when there are monitors present in the hardware.

Instead, add a gating check of resctrl_arch_mon_capable() in free_rmid(), and
just do nothing if the hardware doesn't have monitors.

This fix mirrors the gating checks already present in
mkdir_rdt_prepare_rmid_alloc() and elsewhere.

No functional change on x86.

  [ bp: Massage commit message. ]

Intel-SIG: commit 739c9765793e x86/resctrl: Don't try to free nonexistent RMIDs.
Incremental backporting patches for Intel RDT on Intel Xeon platform.

Fixes: 6791e0ea3071 ("x86/resctrl: Access per-rmid structures by index")
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20240618140152.83154-1-Dave.Martin@arm.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/monitor.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 2345e6836593..366f496ca3ce 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -519,7 +519,8 @@ void free_rmid(u32 closid, u32 rmid)
 	 * allows architectures that ignore the closid parameter to avoid an
 	 * unnecessary check.
 	 */
-	if (idx == resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
+	if (!resctrl_arch_mon_capable() ||
+	    idx == resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
 						RESCTRL_RESERVED_RMID))
 		return;
 
-- 
Gitee


From 3a46eb958e60e09c77b894fc62868f4f05e84cc2 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Sun, 9 Jun 2024 17:39:24 -0700
Subject: [PATCH 166/280] cpu: Move CPU hotplug function declarations into
 their own header

ANBZ: #31045

commit 195fb517ee25bfefde9c74ecd86348eccbd6d2e4 upstream.

Avoid upcoming #include hell when <linux/cachinfo.h> wants to use
lockdep_assert_cpus_held() and creates a #include loop that would
break the build for arch/riscv.

  [ bp: s/cpu/CPU/g ]

Intel-SIG: commit 195fb517ee25 cpu: Move CPU hotplug function declarations into their own header.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240610003927.341707-2-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/cpu.h       | 33 +--------------------------
 include/linux/cpuhplock.h | 47 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+), 32 deletions(-)
 create mode 100644 include/linux/cpuhplock.h

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index b9900a4d4884..e397c102cebe 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -18,6 +18,7 @@
 #include <linux/compiler.h>
 #include <linux/cpumask.h>
 #include <linux/cpuhotplug.h>
+#include <linux/cpuhplock.h>
 #include <linux/cpu_smt.h>
 
 struct device;
@@ -133,38 +134,6 @@ static inline int arch_cpu_rescan_dead_smt_siblings(void) { return 0; }
 #endif /* CONFIG_SMP */
 extern struct bus_type cpu_subsys;
 
-extern int lockdep_is_cpus_held(void);
-
-#ifdef CONFIG_HOTPLUG_CPU
-extern void cpus_write_lock(void);
-extern void cpus_write_unlock(void);
-extern void cpus_read_lock(void);
-extern void cpus_read_unlock(void);
-extern int  cpus_read_trylock(void);
-extern void lockdep_assert_cpus_held(void);
-extern void cpu_hotplug_disable(void);
-extern void cpu_hotplug_enable(void);
-void clear_tasks_mm_cpumask(int cpu);
-int remove_cpu(unsigned int cpu);
-int cpu_device_down(struct device *dev);
-extern void smp_shutdown_nonboot_cpus(unsigned int primary_cpu);
-
-#else /* CONFIG_HOTPLUG_CPU */
-
-static inline void cpus_write_lock(void) { }
-static inline void cpus_write_unlock(void) { }
-static inline void cpus_read_lock(void) { }
-static inline void cpus_read_unlock(void) { }
-static inline int  cpus_read_trylock(void) { return true; }
-static inline void lockdep_assert_cpus_held(void) { }
-static inline void cpu_hotplug_disable(void) { }
-static inline void cpu_hotplug_enable(void) { }
-static inline int remove_cpu(unsigned int cpu) { return -EPERM; }
-static inline void smp_shutdown_nonboot_cpus(unsigned int primary_cpu) { }
-#endif	/* !CONFIG_HOTPLUG_CPU */
-
-DEFINE_LOCK_GUARD_0(cpus_read_lock, cpus_read_lock(), cpus_read_unlock())
-
 #ifdef CONFIG_PM_SLEEP_SMP
 extern int freeze_secondary_cpus(int primary);
 extern void thaw_secondary_cpus(void);
diff --git a/include/linux/cpuhplock.h b/include/linux/cpuhplock.h
new file mode 100644
index 000000000000..386abc482264
--- /dev/null
+++ b/include/linux/cpuhplock.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * include/linux/cpuhplock.h - CPU hotplug locking
+ *
+ * Locking functions for CPU hotplug.
+ */
+#ifndef _LINUX_CPUHPLOCK_H_
+#define _LINUX_CPUHPLOCK_H_
+
+#include <linux/cleanup.h>
+#include <linux/errno.h>
+
+struct device;
+
+extern int lockdep_is_cpus_held(void);
+
+#ifdef CONFIG_HOTPLUG_CPU
+extern void cpus_write_lock(void);
+extern void cpus_write_unlock(void);
+extern void cpus_read_lock(void);
+extern void cpus_read_unlock(void);
+extern int  cpus_read_trylock(void);
+extern void lockdep_assert_cpus_held(void);
+extern void cpu_hotplug_disable(void);
+extern void cpu_hotplug_enable(void);
+void clear_tasks_mm_cpumask(int cpu);
+int remove_cpu(unsigned int cpu);
+int cpu_device_down(struct device *dev);
+extern void smp_shutdown_nonboot_cpus(unsigned int primary_cpu);
+
+#else /* CONFIG_HOTPLUG_CPU */
+
+static inline void cpus_write_lock(void) { }
+static inline void cpus_write_unlock(void) { }
+static inline void cpus_read_lock(void) { }
+static inline void cpus_read_unlock(void) { }
+static inline int  cpus_read_trylock(void) { return true; }
+static inline void lockdep_assert_cpus_held(void) { }
+static inline void cpu_hotplug_disable(void) { }
+static inline void cpu_hotplug_enable(void) { }
+static inline int remove_cpu(unsigned int cpu) { return -EPERM; }
+static inline void smp_shutdown_nonboot_cpus(unsigned int primary_cpu) { }
+#endif	/* !CONFIG_HOTPLUG_CPU */
+
+DEFINE_LOCK_GUARD_0(cpus_read_lock, cpus_read_lock(), cpus_read_unlock())
+
+#endif /* _LINUX_CPUHPLOCK_H_ */
-- 
Gitee


From c918578dc80a0906b25199ef2d156b501d00d3a0 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Sun, 9 Jun 2024 17:39:25 -0700
Subject: [PATCH 167/280] cpu: Drop "extern" from function declarations in
 cpuhplock.h

ANBZ: #31045

commit ddefcfdeb5a2238cbcb07b80dda9ac3136735b1e upstream.

This file was created with a direct cut and paste from cpu.h so
kept the legacy declaration style.

But the Linux coding standard for function declarations in header
files is to avoid use of "extern".

Drop "extern" from all function declarations.

Intel-SIG: commit ddefcfdeb5a2 cpu: Drop "extern" from function declarations in cpuhplock.h.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240610003927.341707-3-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/cpuhplock.h | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/include/linux/cpuhplock.h b/include/linux/cpuhplock.h
index 386abc482264..431560bbd045 100644
--- a/include/linux/cpuhplock.h
+++ b/include/linux/cpuhplock.h
@@ -15,18 +15,18 @@ struct device;
 extern int lockdep_is_cpus_held(void);
 
 #ifdef CONFIG_HOTPLUG_CPU
-extern void cpus_write_lock(void);
-extern void cpus_write_unlock(void);
-extern void cpus_read_lock(void);
-extern void cpus_read_unlock(void);
-extern int  cpus_read_trylock(void);
-extern void lockdep_assert_cpus_held(void);
-extern void cpu_hotplug_disable(void);
-extern void cpu_hotplug_enable(void);
+void cpus_write_lock(void);
+void cpus_write_unlock(void);
+void cpus_read_lock(void);
+void cpus_read_unlock(void);
+int  cpus_read_trylock(void);
+void lockdep_assert_cpus_held(void);
+void cpu_hotplug_disable(void);
+void cpu_hotplug_enable(void);
 void clear_tasks_mm_cpumask(int cpu);
 int remove_cpu(unsigned int cpu);
 int cpu_device_down(struct device *dev);
-extern void smp_shutdown_nonboot_cpus(unsigned int primary_cpu);
+void smp_shutdown_nonboot_cpus(unsigned int primary_cpu);
 
 #else /* CONFIG_HOTPLUG_CPU */
 
-- 
Gitee


From 25e6b94d05d6fa1ecef060e8c98551e9f86a5fec Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Sun, 9 Jun 2024 17:39:26 -0700
Subject: [PATCH 168/280] cacheinfo: Add function to get cacheinfo for a given
 CPU and cache level

ANBZ: #31045

commit 685cb1674060c2cb1b9da051a12933c082b8e874 upstream.

Resctrl open codes a search for information about a given cache level in
a couple of places (and more are on the way).

Provide a new inline function get_cpu_cacheinfo_level() in
<linux/cacheinfo.h> to do the search and return a pointer to the
cacheinfo structure.

Add lockdep_assert_cpus_held() to enforce the comment that cpuhp lock
must be held.

Simplify the existing get_cpu_cacheinfo_id() by using this new function
to do the search.

Intel-SIG: commit 685cb1674060 cacheinfo: Add function to get cacheinfo for a given CPU and cache level.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20240610003927.341707-4-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/cacheinfo.h | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index d504eb4b49ab..ef701ba043e9 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -3,6 +3,7 @@
 #define _LINUX_CACHEINFO_H
 
 #include <linux/bitops.h>
+#include <linux/cpuhplock.h>
 #include <linux/cpumask.h>
 #include <linux/smp.h>
 
@@ -113,23 +114,37 @@ int acpi_get_cache_info(unsigned int cpu,
 const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf);
 
 /*
- * Get the id of the cache associated with @cpu at level @level.
+ * Get the cacheinfo structure for the cache associated with @cpu at
+ * level @level.
  * cpuhp lock must be held.
  */
-static inline int get_cpu_cacheinfo_id(int cpu, int level)
+static inline struct cacheinfo *get_cpu_cacheinfo_level(int cpu, int level)
 {
 	struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu);
 	int i;
 
+	lockdep_assert_cpus_held();
+
 	for (i = 0; i < ci->num_leaves; i++) {
 		if (ci->info_list[i].level == level) {
 			if (ci->info_list[i].attributes & CACHE_ID)
-				return ci->info_list[i].id;
-			return -1;
+				return &ci->info_list[i];
+			return NULL;
 		}
 	}
 
-	return -1;
+	return NULL;
+}
+
+/*
+ * Get the id of the cache associated with @cpu at level @level.
+ * cpuhp lock must be held.
+ */
+static inline int get_cpu_cacheinfo_id(int cpu, int level)
+{
+	struct cacheinfo *ci = get_cpu_cacheinfo_level(cpu, level);
+
+	return ci ? ci->id : -1;
 }
 
 #ifdef CONFIG_ARM64
-- 
Gitee


From 3ef3741eaea1c596c4bd9c5fd86fce5b4790f261 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Sun, 9 Jun 2024 17:39:27 -0700
Subject: [PATCH 169/280] x86/resctrl: Replace open coded cacheinfo searches

ANBZ: #31045

commit f385f024639431bec3e70c33cdbc9563894b3ee5 upstream.

pseudo_lock_region_init() and rdtgroup_cbm_to_size() open code a search for
details of a particular cache level.

Replace with get_cpu_cacheinfo_level().

Intel-SIG: commit f385f0246394 x86/resctrl: Replace open coded cacheinfo searches.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20240610003927.341707-5-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 17 ++++++-----------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 14 +++++---------
 2 files changed, 11 insertions(+), 20 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index aacf236dfe3b..1bbfd3c1e300 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -292,9 +292,8 @@ static void pseudo_lock_region_clear(struct pseudo_lock_region *plr)
  */
 static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
 {
-	struct cpu_cacheinfo *ci;
+	struct cacheinfo *ci;
 	int ret;
-	int i;
 
 	/* Pick the first cpu we find that is associated with the cache. */
 	plr->cpu = cpumask_first(&plr->d->cpu_mask);
@@ -306,15 +305,11 @@ static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
 		goto out_region;
 	}
 
-	ci = get_cpu_cacheinfo(plr->cpu);
-
-	plr->size = rdtgroup_cbm_to_size(plr->s->res, plr->d, plr->cbm);
-
-	for (i = 0; i < ci->num_leaves; i++) {
-		if (ci->info_list[i].level == plr->s->res->cache_level) {
-			plr->line_size = ci->info_list[i].coherency_line_size;
-			return 0;
-		}
+	ci = get_cpu_cacheinfo_level(plr->cpu, plr->s->res->cache_level);
+	if (ci) {
+		plr->line_size = ci->coherency_line_size;
+		plr->size = rdtgroup_cbm_to_size(plr->s->res, plr->d, plr->cbm);
+		return 0;
 	}
 
 	ret = -1;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 02f213f1c51c..cb68a121dabb 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1450,18 +1450,14 @@ static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
 unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
 				  struct rdt_domain *d, unsigned long cbm)
 {
-	struct cpu_cacheinfo *ci;
 	unsigned int size = 0;
-	int num_b, i;
+	struct cacheinfo *ci;
+	int num_b;
 
 	num_b = bitmap_weight(&cbm, r->cache.cbm_len);
-	ci = get_cpu_cacheinfo(cpumask_any(&d->cpu_mask));
-	for (i = 0; i < ci->num_leaves; i++) {
-		if (ci->info_list[i].level == r->cache_level) {
-			size = ci->info_list[i].size / r->cache.cbm_len * num_b;
-			break;
-		}
-	}
+	ci = get_cpu_cacheinfo_level(cpumask_any(&d->cpu_mask), r->cache_level);
+	if (ci)
+		size = ci->size / r->cache.cbm_len * num_b;
 
 	return size;
 }
-- 
Gitee


From f4d24bebb1e73b6d44215f6fda8d7fd8fbb49a56 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:01 -0700
Subject: [PATCH 170/280] x86/resctrl: Prepare for new domain scope

ANBZ: #31045

commit f436cb6913a57bf3e1e66d18bc663e6c20751929 upstream.

Resctrl resources operate on subsets of CPUs in the system with the
defining attribute of each subset being an instance of a particular
level of cache. E.g. all CPUs sharing an L3 cache would be part of the
same domain.

In preparation for features that are scoped at the NUMA node level,
change the code from explicit references to "cache_level" to a more
generic scope. At this point the only options for this scope are groups
of CPUs that share an L2 cache or L3 cache.

Clean up the error handling when looking up domains. Report invalid ids
before calling rdt_find_domain() in preparation for better messages when
scope can be other than cache scope. This means that rdt_find_domain()
will never return an error. So remove checks for error from the call sites.

Intel-SIG: commit f436cb6913a5 x86/resctrl: Prepare for new domain scope.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-2-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        | 46 ++++++++++++++++-------
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  2 +-
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c |  6 ++-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    |  5 ++-
 include/linux/resctrl.h                   |  9 ++++-
 5 files changed, 49 insertions(+), 19 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index ea829600bcb9..31ec7100187c 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -68,7 +68,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_L3,
 			.name			= "L3",
-			.cache_level		= 3,
+			.scope			= RESCTRL_L3_CACHE,
 			.domains		= domain_init(RDT_RESOURCE_L3),
 			.parse_ctrlval		= parse_cbm,
 			.format_str		= "%d=%0*x",
@@ -82,7 +82,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_L2,
 			.name			= "L2",
-			.cache_level		= 2,
+			.scope			= RESCTRL_L2_CACHE,
 			.domains		= domain_init(RDT_RESOURCE_L2),
 			.parse_ctrlval		= parse_cbm,
 			.format_str		= "%d=%0*x",
@@ -96,7 +96,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_MBA,
 			.name			= "MB",
-			.cache_level		= 3,
+			.scope			= RESCTRL_L3_CACHE,
 			.domains		= domain_init(RDT_RESOURCE_MBA),
 			.parse_ctrlval		= parse_bw,
 			.format_str		= "%d=%*u",
@@ -108,7 +108,7 @@ struct rdt_hw_resource rdt_resources_all[] = {
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_SMBA,
 			.name			= "SMBA",
-			.cache_level		= 3,
+			.scope			= RESCTRL_L3_CACHE,
 			.domains		= domain_init(RDT_RESOURCE_SMBA),
 			.parse_ctrlval		= parse_bw,
 			.format_str		= "%d=%*u",
@@ -392,9 +392,6 @@ struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
 	struct rdt_domain *d;
 	struct list_head *l;
 
-	if (id < 0)
-		return ERR_PTR(-ENODEV);
-
 	list_for_each(l, &r->domains) {
 		d = list_entry(l, struct rdt_domain, list);
 		/* When id is found, return its domain. */
@@ -484,6 +481,19 @@ static int arch_domain_mbm_alloc(u32 num_rmid, struct rdt_hw_domain *hw_dom)
 	return 0;
 }
 
+static int get_domain_id_from_scope(int cpu, enum resctrl_scope scope)
+{
+	switch (scope) {
+	case RESCTRL_L2_CACHE:
+	case RESCTRL_L3_CACHE:
+		return get_cpu_cacheinfo_id(cpu, scope);
+	default:
+		break;
+	}
+
+	return -EINVAL;
+}
+
 /*
  * domain_add_cpu - Add a cpu to a resource's domain list.
  *
@@ -499,7 +509,7 @@ static int arch_domain_mbm_alloc(u32 num_rmid, struct rdt_hw_domain *hw_dom)
  */
 static void domain_add_cpu(int cpu, struct rdt_resource *r)
 {
-	int id = get_cpu_cacheinfo_id(cpu, r->cache_level);
+	int id = get_domain_id_from_scope(cpu, r->scope);
 	struct list_head *add_pos = NULL;
 	struct rdt_hw_domain *hw_dom;
 	struct rdt_domain *d;
@@ -507,12 +517,14 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 
 	lockdep_assert_held(&domain_list_lock);
 
-	d = rdt_find_domain(r, id, &add_pos);
-	if (IS_ERR(d)) {
-		pr_warn("Couldn't find cache id for CPU %d\n", cpu);
+	if (id < 0) {
+		pr_warn_once("Can't find domain id for CPU:%d scope:%d for resource %s\n",
+			     cpu, r->scope, r->name);
 		return;
 	}
 
+	d = rdt_find_domain(r, id, &add_pos);
+
 	if (d) {
 		cpumask_set_cpu(cpu, &d->cpu_mask);
 		if (r->cache.arch_has_per_cpu_cfg)
@@ -552,15 +564,21 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 
 static void domain_remove_cpu(int cpu, struct rdt_resource *r)
 {
-	int id = get_cpu_cacheinfo_id(cpu, r->cache_level);
+	int id = get_domain_id_from_scope(cpu, r->scope);
 	struct rdt_hw_domain *hw_dom;
 	struct rdt_domain *d;
 
 	lockdep_assert_held(&domain_list_lock);
 
+	if (id < 0) {
+		pr_warn_once("Can't find domain id for CPU:%d scope:%d for resource %s\n",
+			     cpu, r->scope, r->name);
+		return;
+	}
+
 	d = rdt_find_domain(r, id, NULL);
-	if (IS_ERR_OR_NULL(d)) {
-		pr_warn("Couldn't find cache id for CPU %d\n", cpu);
+	if (!d) {
+		pr_warn("Couldn't find domain with id=%d for CPU %d\n", id, cpu);
 		return;
 	}
 	hw_dom = resctrl_to_arch_dom(d);
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 5891fc950f74..b5b8e9c5be11 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -582,7 +582,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 
 	r = &rdt_resources_all[resid].r_resctrl;
 	d = rdt_find_domain(r, domid, NULL);
-	if (IS_ERR_OR_NULL(d)) {
+	if (!d) {
 		ret = -ENOENT;
 		goto out;
 	}
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 1bbfd3c1e300..201011f0ed0b 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -292,9 +292,13 @@ static void pseudo_lock_region_clear(struct pseudo_lock_region *plr)
  */
 static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
 {
+	enum resctrl_scope scope = plr->s->res->scope;
 	struct cacheinfo *ci;
 	int ret;
 
+	if (WARN_ON_ONCE(scope != RESCTRL_L2_CACHE && scope != RESCTRL_L3_CACHE))
+		return -ENODEV;
+
 	/* Pick the first cpu we find that is associated with the cache. */
 	plr->cpu = cpumask_first(&plr->d->cpu_mask);
 
@@ -305,7 +309,7 @@ static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
 		goto out_region;
 	}
 
-	ci = get_cpu_cacheinfo_level(plr->cpu, plr->s->res->cache_level);
+	ci = get_cpu_cacheinfo_level(plr->cpu, scope);
 	if (ci) {
 		plr->line_size = ci->coherency_line_size;
 		plr->size = rdtgroup_cbm_to_size(plr->s->res, plr->d, plr->cbm);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index cb68a121dabb..50f5876a3020 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1454,8 +1454,11 @@ unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
 	struct cacheinfo *ci;
 	int num_b;
 
+	if (WARN_ON_ONCE(r->scope != RESCTRL_L2_CACHE && r->scope != RESCTRL_L3_CACHE))
+		return size;
+
 	num_b = bitmap_weight(&cbm, r->cache.cbm_len);
-	ci = get_cpu_cacheinfo_level(cpumask_any(&d->cpu_mask), r->cache_level);
+	ci = get_cpu_cacheinfo_level(cpumask_any(&d->cpu_mask), r->scope);
 	if (ci)
 		size = ci->size / r->cache.cbm_len * num_b;
 
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index a365f67131ec..ed693bfe474d 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -150,13 +150,18 @@ struct resctrl_membw {
 struct rdt_parse_data;
 struct resctrl_schema;
 
+enum resctrl_scope {
+	RESCTRL_L2_CACHE = 2,
+	RESCTRL_L3_CACHE = 3,
+};
+
 /**
  * struct rdt_resource - attributes of a resctrl resource
  * @rid:		The index of the resource
  * @alloc_capable:	Is allocation available on this machine
  * @mon_capable:	Is monitor feature available on this machine
  * @num_rmid:		Number of RMIDs available
- * @cache_level:	Which cache level defines scope of this resource
+ * @scope:		Scope of this resource
  * @cache:		Cache allocation related data
  * @membw:		If the component has bandwidth controls, their properties.
  * @domains:		RCU list of all domains for this resource
@@ -174,7 +179,7 @@ struct rdt_resource {
 	bool			alloc_capable;
 	bool			mon_capable;
 	int			num_rmid;
-	int			cache_level;
+	enum resctrl_scope	scope;
 	struct resctrl_cache	cache;
 	struct resctrl_membw	membw;
 	struct list_head	domains;
-- 
Gitee


From 65ba399500e1980fa142bcf01994387569690de4 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:02 -0700
Subject: [PATCH 171/280] x86/resctrl: Prepare to split rdt_domain structure

ANBZ: #31045

commit c103d4d48e1599a88001fa6215be27d55f3c025b upstream.

The rdt_domain structure is used for both control and monitor features.
It is about to be split into separate structures for these two usages
because the scope for control and monitoring features for a resource
will be different for future resources.

To allow for common code that scans a list of domains looking for a
specific domain id, move all the common fields ("list", "id", "cpu_mask")
into their own structure within the rdt_domain structure.

Intel-SIG: commit c103d4d48e15 x86/resctrl: Prepare to split rdt_domain structure.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-3-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        | 26 +++++-----
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 24 ++++-----
 arch/x86/kernel/cpu/resctrl/monitor.c     | 14 +++---
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 14 +++---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 60 +++++++++++------------
 include/linux/resctrl.h                   | 16 ++++--
 6 files changed, 81 insertions(+), 73 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 31ec7100187c..43b9c19eb763 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -355,9 +355,9 @@ struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r)
 
 	lockdep_assert_cpus_held();
 
-	list_for_each_entry(d, &r->domains, list) {
+	list_for_each_entry(d, &r->domains, hdr.list) {
 		/* Find the domain that contains this CPU */
-		if (cpumask_test_cpu(cpu, &d->cpu_mask))
+		if (cpumask_test_cpu(cpu, &d->hdr.cpu_mask))
 			return d;
 	}
 
@@ -393,12 +393,12 @@ struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
 	struct list_head *l;
 
 	list_for_each(l, &r->domains) {
-		d = list_entry(l, struct rdt_domain, list);
+		d = list_entry(l, struct rdt_domain, hdr.list);
 		/* When id is found, return its domain. */
-		if (id == d->id)
+		if (id == d->hdr.id)
 			return d;
 		/* Stop searching when finding id's position in sorted list. */
-		if (id < d->id)
+		if (id < d->hdr.id)
 			break;
 	}
 
@@ -526,7 +526,7 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 	d = rdt_find_domain(r, id, &add_pos);
 
 	if (d) {
-		cpumask_set_cpu(cpu, &d->cpu_mask);
+		cpumask_set_cpu(cpu, &d->hdr.cpu_mask);
 		if (r->cache.arch_has_per_cpu_cfg)
 			rdt_domain_reconfigure_cdp(r);
 		return;
@@ -537,8 +537,8 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 		return;
 
 	d = &hw_dom->d_resctrl;
-	d->id = id;
-	cpumask_set_cpu(cpu, &d->cpu_mask);
+	d->hdr.id = id;
+	cpumask_set_cpu(cpu, &d->hdr.cpu_mask);
 
 	rdt_domain_reconfigure_cdp(r);
 
@@ -552,11 +552,11 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 		return;
 	}
 
-	list_add_tail_rcu(&d->list, add_pos);
+	list_add_tail_rcu(&d->hdr.list, add_pos);
 
 	err = resctrl_online_domain(r, d);
 	if (err) {
-		list_del_rcu(&d->list);
+		list_del_rcu(&d->hdr.list);
 		synchronize_rcu();
 		domain_free(hw_dom);
 	}
@@ -583,10 +583,10 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
 	}
 	hw_dom = resctrl_to_arch_dom(d);
 
-	cpumask_clear_cpu(cpu, &d->cpu_mask);
-	if (cpumask_empty(&d->cpu_mask)) {
+	cpumask_clear_cpu(cpu, &d->hdr.cpu_mask);
+	if (cpumask_empty(&d->hdr.cpu_mask)) {
 		resctrl_offline_domain(r, d);
-		list_del_rcu(&d->list);
+		list_del_rcu(&d->hdr.list);
 		synchronize_rcu();
 
 		/*
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index b5b8e9c5be11..1d8261e84362 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -74,7 +74,7 @@ int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
 
 	cfg = &d->staged_config[s->conf_type];
 	if (cfg->have_new_ctrl) {
-		rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
+		rdt_last_cmd_printf("Duplicate domain %d\n", d->hdr.id);
 		return -EINVAL;
 	}
 
@@ -153,7 +153,7 @@ int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
 
 	cfg = &d->staged_config[s->conf_type];
 	if (cfg->have_new_ctrl) {
-		rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
+		rdt_last_cmd_printf("Duplicate domain %d\n", d->hdr.id);
 		return -EINVAL;
 	}
 
@@ -236,8 +236,8 @@ static int parse_line(char *line, struct resctrl_schema *s,
 		return -EINVAL;
 	}
 	dom = strim(dom);
-	list_for_each_entry(d, &r->domains, list) {
-		if (d->id == dom_id) {
+	list_for_each_entry(d, &r->domains, hdr.list) {
+		if (d->hdr.id == dom_id) {
 			data.buf = dom;
 			data.rdtgrp = rdtgrp;
 			if (r->parse_ctrlval(&data, s, d))
@@ -285,7 +285,7 @@ int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
 	u32 idx = get_config_index(closid, t);
 	struct msr_param msr_param;
 
-	if (!cpumask_test_cpu(smp_processor_id(), &d->cpu_mask))
+	if (!cpumask_test_cpu(smp_processor_id(), &d->hdr.cpu_mask))
 		return -EINVAL;
 
 	hw_dom->ctrl_val[idx] = cfg_val;
@@ -311,7 +311,7 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 	/* Walking r->domains, ensure it can't race with cpuhp */
 	lockdep_assert_cpus_held();
 
-	list_for_each_entry(d, &r->domains, list) {
+	list_for_each_entry(d, &r->domains, hdr.list) {
 		hw_dom = resctrl_to_arch_dom(d);
 		msr_param.res = NULL;
 		for (t = 0; t < CDP_NUM_TYPES; t++) {
@@ -335,7 +335,7 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 			}
 		}
 		if (msr_param.res)
-			smp_call_function_any(&d->cpu_mask, rdt_ctrl_update, &msr_param, 1);
+			smp_call_function_any(&d->hdr.cpu_mask, rdt_ctrl_update, &msr_param, 1);
 	}
 
 	return 0;
@@ -455,7 +455,7 @@ static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int clo
 	lockdep_assert_cpus_held();
 
 	seq_printf(s, "%*s:", max_name_width, schema->name);
-	list_for_each_entry(dom, &r->domains, list) {
+	list_for_each_entry(dom, &r->domains, hdr.list) {
 		if (sep)
 			seq_puts(s, ";");
 
@@ -465,7 +465,7 @@ static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int clo
 			ctrl_val = resctrl_arch_get_config(r, dom, closid,
 							   schema->conf_type);
 
-		seq_printf(s, r->format_str, dom->id, max_data_width,
+		seq_printf(s, r->format_str, dom->hdr.id, max_data_width,
 			   ctrl_val);
 		sep = true;
 	}
@@ -494,7 +494,7 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
 			} else {
 				seq_printf(s, "%s:%d=%x\n",
 					   rdtgrp->plr->s->res->name,
-					   rdtgrp->plr->d->id,
+					   rdtgrp->plr->d->hdr.id,
 					   rdtgrp->plr->cbm);
 			}
 		} else {
@@ -542,7 +542,7 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 		return;
 	}
 
-	cpu = cpumask_any_housekeeping(&d->cpu_mask, RESCTRL_PICK_ANY_CPU);
+	cpu = cpumask_any_housekeeping(&d->hdr.cpu_mask, RESCTRL_PICK_ANY_CPU);
 
 	/*
 	 * cpumask_any_housekeeping() prefers housekeeping CPUs, but
@@ -551,7 +551,7 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 	 * counters on some platforms if its called in IRQ context.
 	 */
 	if (tick_nohz_full_cpu(cpu))
-		smp_call_function_any(&d->cpu_mask, mon_event_count, rr, 1);
+		smp_call_function_any(&d->hdr.cpu_mask, mon_event_count, rr, 1);
 	else
 		smp_call_on_cpu(cpu, smp_mon_event_count, rr, false);
 
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 366f496ca3ce..4d7c596f9276 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -281,7 +281,7 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
 
 	resctrl_arch_rmid_read_context_check();
 
-	if (!cpumask_test_cpu(smp_processor_id(), &d->cpu_mask))
+	if (!cpumask_test_cpu(smp_processor_id(), &d->hdr.cpu_mask))
 		return -EINVAL;
 
 	ret = __rmid_read(rmid, eventid, &msr_val);
@@ -364,7 +364,7 @@ void __check_limbo(struct rdt_domain *d, bool force_free)
 			 * CLOSID and RMID because there may be dependencies between them
 			 * on some architectures.
 			 */
-			trace_mon_llc_occupancy_limbo(entry->closid, entry->rmid, d->id, val);
+			trace_mon_llc_occupancy_limbo(entry->closid, entry->rmid, d->hdr.id, val);
 		}
 
 		if (force_free || !rmid_dirty) {
@@ -490,7 +490,7 @@ static void add_rmid_to_limbo(struct rmid_entry *entry)
 	idx = resctrl_arch_rmid_idx_encode(entry->closid, entry->rmid);
 
 	entry->busy = 0;
-	list_for_each_entry(d, &r->domains, list) {
+	list_for_each_entry(d, &r->domains, hdr.list) {
 		/*
 		 * For the first limbo RMID in the domain,
 		 * setup up the limbo worker.
@@ -802,7 +802,7 @@ void cqm_handle_limbo(struct work_struct *work)
 	__check_limbo(d, false);
 
 	if (has_busy_rmid(d)) {
-		d->cqm_work_cpu = cpumask_any_housekeeping(&d->cpu_mask,
+		d->cqm_work_cpu = cpumask_any_housekeeping(&d->hdr.cpu_mask,
 							   RESCTRL_PICK_ANY_CPU);
 		schedule_delayed_work_on(d->cqm_work_cpu, &d->cqm_limbo,
 					 delay);
@@ -826,7 +826,7 @@ void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms,
 	unsigned long delay = msecs_to_jiffies(delay_ms);
 	int cpu;
 
-	cpu = cpumask_any_housekeeping(&dom->cpu_mask, exclude_cpu);
+	cpu = cpumask_any_housekeeping(&dom->hdr.cpu_mask, exclude_cpu);
 	dom->cqm_work_cpu = cpu;
 
 	if (cpu < nr_cpu_ids)
@@ -869,7 +869,7 @@ void mbm_handle_overflow(struct work_struct *work)
 	 * Re-check for housekeeping CPUs. This allows the overflow handler to
 	 * move off a nohz_full CPU quickly.
 	 */
-	d->mbm_work_cpu = cpumask_any_housekeeping(&d->cpu_mask,
+	d->mbm_work_cpu = cpumask_any_housekeeping(&d->hdr.cpu_mask,
 						   RESCTRL_PICK_ANY_CPU);
 	schedule_delayed_work_on(d->mbm_work_cpu, &d->mbm_over, delay);
 
@@ -898,7 +898,7 @@ void mbm_setup_overflow_handler(struct rdt_domain *dom, unsigned long delay_ms,
 	 */
 	if (!resctrl_mounted || !resctrl_arch_mon_capable())
 		return;
-	cpu = cpumask_any_housekeeping(&dom->cpu_mask, exclude_cpu);
+	cpu = cpumask_any_housekeeping(&dom->hdr.cpu_mask, exclude_cpu);
 	dom->mbm_work_cpu = cpu;
 
 	if (cpu < nr_cpu_ids)
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 201011f0ed0b..df45c839a58f 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -221,7 +221,7 @@ static int pseudo_lock_cstates_constrain(struct pseudo_lock_region *plr)
 	int cpu;
 	int ret;
 
-	for_each_cpu(cpu, &plr->d->cpu_mask) {
+	for_each_cpu(cpu, &plr->d->hdr.cpu_mask) {
 		pm_req = kzalloc(sizeof(*pm_req), GFP_KERNEL);
 		if (!pm_req) {
 			rdt_last_cmd_puts("Failure to allocate memory for PM QoS\n");
@@ -300,7 +300,7 @@ static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
 		return -ENODEV;
 
 	/* Pick the first cpu we find that is associated with the cache. */
-	plr->cpu = cpumask_first(&plr->d->cpu_mask);
+	plr->cpu = cpumask_first(&plr->d->hdr.cpu_mask);
 
 	if (!cpu_online(plr->cpu)) {
 		rdt_last_cmd_printf("CPU %u associated with cache not online\n",
@@ -854,10 +854,10 @@ bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
 	 * associated with them.
 	 */
 	for_each_alloc_capable_rdt_resource(r) {
-		list_for_each_entry(d_i, &r->domains, list) {
+		list_for_each_entry(d_i, &r->domains, hdr.list) {
 			if (d_i->plr)
 				cpumask_or(cpu_with_psl, cpu_with_psl,
-					   &d_i->cpu_mask);
+					   &d_i->hdr.cpu_mask);
 		}
 	}
 
@@ -865,7 +865,7 @@ bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
 	 * Next test if new pseudo-locked region would intersect with
 	 * existing region.
 	 */
-	if (cpumask_intersects(&d->cpu_mask, cpu_with_psl))
+	if (cpumask_intersects(&d->hdr.cpu_mask, cpu_with_psl))
 		ret = true;
 
 	free_cpumask_var(cpu_with_psl);
@@ -1197,7 +1197,7 @@ static int pseudo_lock_measure_cycles(struct rdtgroup *rdtgrp, int sel)
 	}
 
 	plr->thread_done = 0;
-	cpu = cpumask_first(&plr->d->cpu_mask);
+	cpu = cpumask_first(&plr->d->hdr.cpu_mask);
 	if (!cpu_online(cpu)) {
 		ret = -ENODEV;
 		goto out;
@@ -1527,7 +1527,7 @@ static int pseudo_lock_dev_mmap(struct file *filp, struct vm_area_struct *vma)
 	 * may be scheduled elsewhere and invalidate entries in the
 	 * pseudo-locked region.
 	 */
-	if (!cpumask_subset(current->cpus_ptr, &plr->d->cpu_mask)) {
+	if (!cpumask_subset(current->cpus_ptr, &plr->d->hdr.cpu_mask)) {
 		mutex_unlock(&rdtgroup_mutex);
 		return -EINVAL;
 	}
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 50f5876a3020..b6ba77cdf0e8 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -98,7 +98,7 @@ void rdt_staged_configs_clear(void)
 	lockdep_assert_held(&rdtgroup_mutex);
 
 	for_each_alloc_capable_rdt_resource(r) {
-		list_for_each_entry(dom, &r->domains, list)
+		list_for_each_entry(dom, &r->domains, hdr.list)
 			memset(dom->staged_config, 0, sizeof(dom->staged_config));
 	}
 }
@@ -317,7 +317,7 @@ static int rdtgroup_cpus_show(struct kernfs_open_file *of,
 				rdt_last_cmd_puts("Cache domain offline\n");
 				ret = -ENODEV;
 			} else {
-				mask = &rdtgrp->plr->d->cpu_mask;
+				mask = &rdtgrp->plr->d->hdr.cpu_mask;
 				seq_printf(s, is_cpu_list(of) ?
 					   "%*pbl\n" : "%*pb\n",
 					   cpumask_pr_args(mask));
@@ -1021,12 +1021,12 @@ static int rdt_bit_usage_show(struct kernfs_open_file *of,
 	cpus_read_lock();
 	mutex_lock(&rdtgroup_mutex);
 	hw_shareable = r->cache.shareable_bits;
-	list_for_each_entry(dom, &r->domains, list) {
+	list_for_each_entry(dom, &r->domains, hdr.list) {
 		if (sep)
 			seq_putc(seq, ';');
 		sw_shareable = 0;
 		exclusive = 0;
-		seq_printf(seq, "%d=", dom->id);
+		seq_printf(seq, "%d=", dom->hdr.id);
 		for (i = 0; i < closids_supported(); i++) {
 			if (!closid_allocated(i))
 				continue;
@@ -1343,7 +1343,7 @@ static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
 		if (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)
 			continue;
 		has_cache = true;
-		list_for_each_entry(d, &r->domains, list) {
+		list_for_each_entry(d, &r->domains, hdr.list) {
 			ctrl = resctrl_arch_get_config(r, d, closid,
 						       s->conf_type);
 			if (rdtgroup_cbm_overlaps(s, d, ctrl, closid, false)) {
@@ -1458,7 +1458,7 @@ unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
 		return size;
 
 	num_b = bitmap_weight(&cbm, r->cache.cbm_len);
-	ci = get_cpu_cacheinfo_level(cpumask_any(&d->cpu_mask), r->scope);
+	ci = get_cpu_cacheinfo_level(cpumask_any(&d->hdr.cpu_mask), r->scope);
 	if (ci)
 		size = ci->size / r->cache.cbm_len * num_b;
 
@@ -1502,7 +1502,7 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 			size = rdtgroup_cbm_to_size(rdtgrp->plr->s->res,
 						    rdtgrp->plr->d,
 						    rdtgrp->plr->cbm);
-			seq_printf(s, "%d=%u\n", rdtgrp->plr->d->id, size);
+			seq_printf(s, "%d=%u\n", rdtgrp->plr->d->hdr.id, size);
 		}
 		goto out;
 	}
@@ -1514,7 +1514,7 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 		type = schema->conf_type;
 		sep = false;
 		seq_printf(s, "%*s:", max_name_width, schema->name);
-		list_for_each_entry(d, &r->domains, list) {
+		list_for_each_entry(d, &r->domains, hdr.list) {
 			if (sep)
 				seq_putc(s, ';');
 			if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
@@ -1532,7 +1532,7 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 				else
 					size = rdtgroup_cbm_to_size(r, d, ctrl);
 			}
-			seq_printf(s, "%d=%u", d->id, size);
+			seq_printf(s, "%d=%u", d->hdr.id, size);
 			sep = true;
 		}
 		seq_putc(s, '\n');
@@ -1592,7 +1592,7 @@ static void mon_event_config_read(void *info)
 
 static void mondata_config_read(struct rdt_domain *d, struct mon_config_info *mon_info)
 {
-	smp_call_function_any(&d->cpu_mask, mon_event_config_read, mon_info, 1);
+	smp_call_function_any(&d->hdr.cpu_mask, mon_event_config_read, mon_info, 1);
 }
 
 static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid)
@@ -1604,7 +1604,7 @@ static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid
 	cpus_read_lock();
 	mutex_lock(&rdtgroup_mutex);
 
-	list_for_each_entry(dom, &r->domains, list) {
+	list_for_each_entry(dom, &r->domains, hdr.list) {
 		if (sep)
 			seq_puts(s, ";");
 
@@ -1612,7 +1612,7 @@ static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid
 		mon_info.evtid = evtid;
 		mondata_config_read(dom, &mon_info);
 
-		seq_printf(s, "%d=0x%02x", dom->id, mon_info.mon_config);
+		seq_printf(s, "%d=0x%02x", dom->hdr.id, mon_info.mon_config);
 		sep = true;
 	}
 	seq_puts(s, "\n");
@@ -1678,7 +1678,7 @@ static void mbm_config_write_domain(struct rdt_resource *r,
 	 * are scoped at the domain level. Writing any of these MSRs
 	 * on one CPU is observed by all the CPUs in the domain.
 	 */
-	smp_call_function_any(&d->cpu_mask, mon_event_config_write,
+	smp_call_function_any(&d->hdr.cpu_mask, mon_event_config_write,
 			      &mon_info, 1);
 
 	/*
@@ -1728,8 +1728,8 @@ static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
 		return -EINVAL;
 	}
 
-	list_for_each_entry(d, &r->domains, list) {
-		if (d->id == dom_id) {
+	list_for_each_entry(d, &r->domains, hdr.list) {
+		if (d->hdr.id == dom_id) {
 			mbm_config_write_domain(r, d, evtid, val);
 			goto next;
 		}
@@ -2276,14 +2276,14 @@ static int set_cache_qos_cfg(int level, bool enable)
 		return -ENOMEM;
 
 	r_l = &rdt_resources_all[level].r_resctrl;
-	list_for_each_entry(d, &r_l->domains, list) {
+	list_for_each_entry(d, &r_l->domains, hdr.list) {
 		if (r_l->cache.arch_has_per_cpu_cfg)
 			/* Pick all the CPUs in the domain instance */
-			for_each_cpu(cpu, &d->cpu_mask)
+			for_each_cpu(cpu, &d->hdr.cpu_mask)
 				cpumask_set_cpu(cpu, cpu_mask);
 		else
 			/* Pick one CPU from each domain instance to update MSR */
-			cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
+			cpumask_set_cpu(cpumask_any(&d->hdr.cpu_mask), cpu_mask);
 	}
 
 	/* Update QOS_CFG MSR on all the CPUs in cpu_mask */
@@ -2312,7 +2312,7 @@ void rdt_domain_reconfigure_cdp(struct rdt_resource *r)
 static int mba_sc_domain_allocate(struct rdt_resource *r, struct rdt_domain *d)
 {
 	u32 num_closid = resctrl_arch_get_num_closid(r);
-	int cpu = cpumask_any(&d->cpu_mask);
+	int cpu = cpumask_any(&d->hdr.cpu_mask);
 	int i;
 
 	d->mbps_val = kcalloc_node(num_closid, sizeof(*d->mbps_val),
@@ -2361,7 +2361,7 @@ static int set_mba_sc(bool mba_sc)
 
 	r->membw.mba_sc = mba_sc;
 
-	list_for_each_entry(d, &r->domains, list) {
+	list_for_each_entry(d, &r->domains, hdr.list) {
 		for (i = 0; i < num_closid; i++)
 			d->mbps_val[i] = MBA_MAX_MBPS;
 	}
@@ -2700,7 +2700,7 @@ static int rdt_get_tree(struct fs_context *fc)
 
 	if (is_mbm_enabled()) {
 		r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
-		list_for_each_entry(dom, &r->domains, list)
+		list_for_each_entry(dom, &r->domains, hdr.list)
 			mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL,
 						   RESCTRL_PICK_ANY_CPU);
 	}
@@ -2827,13 +2827,13 @@ static int reset_all_ctrls(struct rdt_resource *r)
 	 * CBMs in all domains to the maximum mask value. Pick one CPU
 	 * from each domain to update the MSRs below.
 	 */
-	list_for_each_entry(d, &r->domains, list) {
+	list_for_each_entry(d, &r->domains, hdr.list) {
 		hw_dom = resctrl_to_arch_dom(d);
 
 		for (i = 0; i < hw_res->num_closid; i++)
 			hw_dom->ctrl_val[i] = r->default_ctrl;
 		msr_param.dom = d;
-		smp_call_function_any(&d->cpu_mask, rdt_ctrl_update, &msr_param, 1);
+		smp_call_function_any(&d->hdr.cpu_mask, rdt_ctrl_update, &msr_param, 1);
 	}
 
 	return 0;
@@ -3031,7 +3031,7 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
 	char name[32];
 	int ret;
 
-	sprintf(name, "mon_%s_%02d", r->name, d->id);
+	sprintf(name, "mon_%s_%02d", r->name, d->hdr.id);
 	/* create the directory */
 	kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp);
 	if (IS_ERR(kn))
@@ -3047,7 +3047,7 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
 	}
 
 	priv.u.rid = r->rid;
-	priv.u.domid = d->id;
+	priv.u.domid = d->hdr.id;
 	list_for_each_entry(mevt, &r->evt_list, list) {
 		priv.u.evtid = mevt->evtid;
 		ret = mon_addfile(kn, mevt->name, priv.priv);
@@ -3098,7 +3098,7 @@ static int mkdir_mondata_subdir_alldom(struct kernfs_node *parent_kn,
 	/* Walking r->domains, ensure it can't race with cpuhp */
 	lockdep_assert_cpus_held();
 
-	list_for_each_entry(dom, &r->domains, list) {
+	list_for_each_entry(dom, &r->domains, hdr.list) {
 		ret = mkdir_mondata_subdir(parent_kn, dom, r, prgrp);
 		if (ret)
 			return ret;
@@ -3257,7 +3257,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 	 */
 	tmp_cbm = cfg->new_ctrl;
 	if (bitmap_weight(&tmp_cbm, r->cache.cbm_len) < r->cache.min_cbm_bits) {
-		rdt_last_cmd_printf("No space on %s:%d\n", s->name, d->id);
+		rdt_last_cmd_printf("No space on %s:%d\n", s->name, d->hdr.id);
 		return -ENOSPC;
 	}
 	cfg->have_new_ctrl = true;
@@ -3280,7 +3280,7 @@ static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
 	struct rdt_domain *d;
 	int ret;
 
-	list_for_each_entry(d, &s->res->domains, list) {
+	list_for_each_entry(d, &s->res->domains, hdr.list) {
 		ret = __init_one_rdt_domain(d, s, closid);
 		if (ret < 0)
 			return ret;
@@ -3295,7 +3295,7 @@ static void rdtgroup_init_mba(struct rdt_resource *r, u32 closid)
 	struct resctrl_staged_config *cfg;
 	struct rdt_domain *d;
 
-	list_for_each_entry(d, &r->domains, list) {
+	list_for_each_entry(d, &r->domains, hdr.list) {
 		if (is_mba_sc(r)) {
 			d->mbps_val[closid] = MBA_MAX_MBPS;
 			continue;
@@ -3941,7 +3941,7 @@ void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d)
 	 * per domain monitor data directories.
 	 */
 	if (resctrl_mounted && resctrl_arch_mon_capable())
-		rmdir_mondata_subdir_allrdtgrp(r, d->id);
+		rmdir_mondata_subdir_allrdtgrp(r, d->hdr.id);
 
 	if (is_mbm_enabled())
 		cancel_delayed_work(&d->mbm_over);
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index ed693bfe474d..f63fcf17a3bc 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -59,10 +59,20 @@ struct resctrl_staged_config {
 };
 
 /**
- * struct rdt_domain - group of CPUs sharing a resctrl resource
+ * struct rdt_domain_hdr - common header for different domain types
  * @list:		all instances of this resource
  * @id:			unique id for this instance
  * @cpu_mask:		which CPUs share this resource
+ */
+struct rdt_domain_hdr {
+	struct list_head		list;
+	int				id;
+	struct cpumask			cpu_mask;
+};
+
+/**
+ * struct rdt_domain - group of CPUs sharing a resctrl resource
+ * @hdr:		common header for different domain types
  * @rmid_busy_llc:	bitmap of which limbo RMIDs are above threshold
  * @mbm_total:		saved state for MBM total bandwidth
  * @mbm_local:		saved state for MBM local bandwidth
@@ -77,9 +87,7 @@ struct resctrl_staged_config {
  *			by closid
  */
 struct rdt_domain {
-	struct list_head		list;
-	int				id;
-	struct cpumask			cpu_mask;
+	struct rdt_domain_hdr		hdr;
 	unsigned long			*rmid_busy_llc;
 	struct mbm_state		*mbm_total;
 	struct mbm_state		*mbm_local;
-- 
Gitee


From d1a24e8192345b99c6a3eec5dc8decd5669d3352 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:03 -0700
Subject: [PATCH 172/280] x86/resctrl: Prepare for different scope for
 control/monitor operations

ANBZ: #31045

commit cd84f72b6a5c10f79f19fab67b0edfbc4fdbc5b1 upstream.

Resctrl assumes that control and monitor operations on a resource are
performed at the same scope.

Prepare for systems that use different scope (specifically Intel needs
to split the RDT_RESOURCE_L3 resource to use L3 scope for cache control
and NODE scope for cache occupancy and memory bandwidth monitoring).

Create separate domain lists for control and monitor operations.

Note that errors during initialization of either control or monitor
functions on a domain would previously result in that domain being
excluded from both control and monitor operations. Now the domains are
allocated independently it is no longer required to disable both control
and monitor operations if either fail.

Intel-SIG: commit cd84f72b6a5c x86/resctrl: Prepare for different scope for control/monitor operations.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-4-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        | 224 +++++++++++++++++-----
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  12 +-
 arch/x86/kernel/cpu/resctrl/internal.h    |   7 +-
 arch/x86/kernel/cpu/resctrl/monitor.c     |   4 +-
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c |   4 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    |  60 +++---
 include/linux/resctrl.h                   |  25 ++-
 7 files changed, 240 insertions(+), 96 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 43b9c19eb763..9d513e2e47e9 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -60,7 +60,8 @@ static void mba_wrmsr_intel(struct msr_param *m);
 static void cat_wrmsr(struct msr_param *m);
 static void mba_wrmsr_amd(struct msr_param *m);
 
-#define domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].r_resctrl.domains)
+#define ctrl_domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].r_resctrl.ctrl_domains)
+#define mon_domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].r_resctrl.mon_domains)
 
 struct rdt_hw_resource rdt_resources_all[] = {
 	[RDT_RESOURCE_L3] =
@@ -68,8 +69,10 @@ struct rdt_hw_resource rdt_resources_all[] = {
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_L3,
 			.name			= "L3",
-			.scope			= RESCTRL_L3_CACHE,
-			.domains		= domain_init(RDT_RESOURCE_L3),
+			.ctrl_scope		= RESCTRL_L3_CACHE,
+			.mon_scope		= RESCTRL_L3_CACHE,
+			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_L3),
+			.mon_domains		= mon_domain_init(RDT_RESOURCE_L3),
 			.parse_ctrlval		= parse_cbm,
 			.format_str		= "%d=%0*x",
 			.fflags			= RFTYPE_RES_CACHE,
@@ -82,8 +85,8 @@ struct rdt_hw_resource rdt_resources_all[] = {
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_L2,
 			.name			= "L2",
-			.scope			= RESCTRL_L2_CACHE,
-			.domains		= domain_init(RDT_RESOURCE_L2),
+			.ctrl_scope		= RESCTRL_L2_CACHE,
+			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_L2),
 			.parse_ctrlval		= parse_cbm,
 			.format_str		= "%d=%0*x",
 			.fflags			= RFTYPE_RES_CACHE,
@@ -96,8 +99,8 @@ struct rdt_hw_resource rdt_resources_all[] = {
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_MBA,
 			.name			= "MB",
-			.scope			= RESCTRL_L3_CACHE,
-			.domains		= domain_init(RDT_RESOURCE_MBA),
+			.ctrl_scope		= RESCTRL_L3_CACHE,
+			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_MBA),
 			.parse_ctrlval		= parse_bw,
 			.format_str		= "%d=%*u",
 			.fflags			= RFTYPE_RES_MB,
@@ -108,8 +111,8 @@ struct rdt_hw_resource rdt_resources_all[] = {
 		.r_resctrl = {
 			.rid			= RDT_RESOURCE_SMBA,
 			.name			= "SMBA",
-			.scope			= RESCTRL_L3_CACHE,
-			.domains		= domain_init(RDT_RESOURCE_SMBA),
+			.ctrl_scope		= RESCTRL_L3_CACHE,
+			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_SMBA),
 			.parse_ctrlval		= parse_bw,
 			.format_str		= "%d=%*u",
 			.fflags			= RFTYPE_RES_MB,
@@ -349,13 +352,28 @@ static void cat_wrmsr(struct msr_param *m)
 		wrmsrl(hw_res->msr_base + i, hw_dom->ctrl_val[i]);
 }
 
-struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r)
+struct rdt_domain *get_ctrl_domain_from_cpu(int cpu, struct rdt_resource *r)
 {
 	struct rdt_domain *d;
 
 	lockdep_assert_cpus_held();
 
-	list_for_each_entry(d, &r->domains, hdr.list) {
+	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
+		/* Find the domain that contains this CPU */
+		if (cpumask_test_cpu(cpu, &d->hdr.cpu_mask))
+			return d;
+	}
+
+	return NULL;
+}
+
+struct rdt_domain *get_mon_domain_from_cpu(int cpu, struct rdt_resource *r)
+{
+	struct rdt_domain *d;
+
+	lockdep_assert_cpus_held();
+
+	list_for_each_entry(d, &r->mon_domains, hdr.list) {
 		/* Find the domain that contains this CPU */
 		if (cpumask_test_cpu(cpu, &d->hdr.cpu_mask))
 			return d;
@@ -379,26 +397,26 @@ void rdt_ctrl_update(void *arg)
 }
 
 /*
- * rdt_find_domain - Find a domain in a resource that matches input resource id
+ * rdt_find_domain - Search for a domain id in a resource domain list.
  *
- * Search resource r's domain list to find the resource id. If the resource
- * id is found in a domain, return the domain. Otherwise, if requested by
- * caller, return the first domain whose id is bigger than the input id.
- * The domain list is sorted by id in ascending order.
+ * Search the domain list to find the domain id. If the domain id is
+ * found, return the domain. NULL otherwise.  If the domain id is not
+ * found (and NULL returned) then the first domain with id bigger than
+ * the input id can be returned to the caller via @pos.
  */
-struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
-				   struct list_head **pos)
+struct rdt_domain_hdr *rdt_find_domain(struct list_head *h, int id,
+				       struct list_head **pos)
 {
-	struct rdt_domain *d;
+	struct rdt_domain_hdr *d;
 	struct list_head *l;
 
-	list_for_each(l, &r->domains) {
-		d = list_entry(l, struct rdt_domain, hdr.list);
+	list_for_each(l, h) {
+		d = list_entry(l, struct rdt_domain_hdr, list);
 		/* When id is found, return its domain. */
-		if (id == d->hdr.id)
+		if (id == d->id)
 			return d;
 		/* Stop searching when finding id's position in sorted list. */
-		if (id < d->hdr.id)
+		if (id < d->id)
 			break;
 	}
 
@@ -494,38 +512,29 @@ static int get_domain_id_from_scope(int cpu, enum resctrl_scope scope)
 	return -EINVAL;
 }
 
-/*
- * domain_add_cpu - Add a cpu to a resource's domain list.
- *
- * If an existing domain in the resource r's domain list matches the cpu's
- * resource id, add the cpu in the domain.
- *
- * Otherwise, a new domain is allocated and inserted into the right position
- * in the domain list sorted by id in ascending order.
- *
- * The order in the domain list is visible to users when we print entries
- * in the schemata file and schemata input is validated to have the same order
- * as this list.
- */
-static void domain_add_cpu(int cpu, struct rdt_resource *r)
+static void domain_add_cpu_ctrl(int cpu, struct rdt_resource *r)
 {
-	int id = get_domain_id_from_scope(cpu, r->scope);
+	int id = get_domain_id_from_scope(cpu, r->ctrl_scope);
 	struct list_head *add_pos = NULL;
 	struct rdt_hw_domain *hw_dom;
+	struct rdt_domain_hdr *hdr;
 	struct rdt_domain *d;
 	int err;
 
 	lockdep_assert_held(&domain_list_lock);
 
 	if (id < 0) {
-		pr_warn_once("Can't find domain id for CPU:%d scope:%d for resource %s\n",
-			     cpu, r->scope, r->name);
+		pr_warn_once("Can't find control domain id for CPU:%d scope:%d for resource %s\n",
+			     cpu, r->ctrl_scope, r->name);
 		return;
 	}
 
-	d = rdt_find_domain(r, id, &add_pos);
+	hdr = rdt_find_domain(&r->ctrl_domains, id, &add_pos);
+	if (hdr) {
+		if (WARN_ON_ONCE(hdr->type != RESCTRL_CTRL_DOMAIN))
+			return;
+		d = container_of(hdr, struct rdt_domain, hdr);
 
-	if (d) {
 		cpumask_set_cpu(cpu, &d->hdr.cpu_mask);
 		if (r->cache.arch_has_per_cpu_cfg)
 			rdt_domain_reconfigure_cdp(r);
@@ -538,23 +547,70 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 
 	d = &hw_dom->d_resctrl;
 	d->hdr.id = id;
+	d->hdr.type = RESCTRL_CTRL_DOMAIN;
 	cpumask_set_cpu(cpu, &d->hdr.cpu_mask);
 
 	rdt_domain_reconfigure_cdp(r);
 
-	if (r->alloc_capable && domain_setup_ctrlval(r, d)) {
+	if (domain_setup_ctrlval(r, d)) {
 		domain_free(hw_dom);
 		return;
 	}
 
-	if (r->mon_capable && arch_domain_mbm_alloc(r->num_rmid, hw_dom)) {
+	list_add_tail_rcu(&d->hdr.list, add_pos);
+
+	err = resctrl_online_ctrl_domain(r, d);
+	if (err) {
+		list_del_rcu(&d->hdr.list);
+		synchronize_rcu();
+		domain_free(hw_dom);
+	}
+}
+
+static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
+{
+	int id = get_domain_id_from_scope(cpu, r->mon_scope);
+	struct list_head *add_pos = NULL;
+	struct rdt_hw_domain *hw_dom;
+	struct rdt_domain_hdr *hdr;
+	struct rdt_domain *d;
+	int err;
+
+	lockdep_assert_held(&domain_list_lock);
+
+	if (id < 0) {
+		pr_warn_once("Can't find monitor domain id for CPU:%d scope:%d for resource %s\n",
+			     cpu, r->mon_scope, r->name);
+		return;
+	}
+
+	hdr = rdt_find_domain(&r->mon_domains, id, &add_pos);
+	if (hdr) {
+		if (WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN))
+			return;
+		d = container_of(hdr, struct rdt_domain, hdr);
+
+		cpumask_set_cpu(cpu, &d->hdr.cpu_mask);
+		return;
+	}
+
+	hw_dom = kzalloc_node(sizeof(*hw_dom), GFP_KERNEL, cpu_to_node(cpu));
+	if (!hw_dom)
+		return;
+
+	d = &hw_dom->d_resctrl;
+	d->hdr.id = id;
+	d->hdr.type = RESCTRL_MON_DOMAIN;
+	cpumask_set_cpu(cpu, &d->hdr.cpu_mask);
+
+	if (arch_domain_mbm_alloc(r->num_rmid, hw_dom)) {
 		domain_free(hw_dom);
 		return;
 	}
 
 	list_add_tail_rcu(&d->hdr.list, add_pos);
 
-	err = resctrl_online_domain(r, d);
+	err = resctrl_online_mon_domain(r, d);
 	if (err) {
 		list_del_rcu(&d->hdr.list);
 		synchronize_rcu();
@@ -562,30 +618,45 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 	}
 }
 
-static void domain_remove_cpu(int cpu, struct rdt_resource *r)
+static void domain_add_cpu(int cpu, struct rdt_resource *r)
+{
+	if (r->alloc_capable)
+		domain_add_cpu_ctrl(cpu, r);
+	if (r->mon_capable)
+		domain_add_cpu_mon(cpu, r);
+}
+
+static void domain_remove_cpu_ctrl(int cpu, struct rdt_resource *r)
 {
-	int id = get_domain_id_from_scope(cpu, r->scope);
+	int id = get_domain_id_from_scope(cpu, r->ctrl_scope);
 	struct rdt_hw_domain *hw_dom;
+	struct rdt_domain_hdr *hdr;
 	struct rdt_domain *d;
 
 	lockdep_assert_held(&domain_list_lock);
 
 	if (id < 0) {
-		pr_warn_once("Can't find domain id for CPU:%d scope:%d for resource %s\n",
-			     cpu, r->scope, r->name);
+		pr_warn_once("Can't find control domain id for CPU:%d scope:%d for resource %s\n",
+			     cpu, r->ctrl_scope, r->name);
 		return;
 	}
 
-	d = rdt_find_domain(r, id, NULL);
-	if (!d) {
-		pr_warn("Couldn't find domain with id=%d for CPU %d\n", id, cpu);
+	hdr = rdt_find_domain(&r->ctrl_domains, id, NULL);
+	if (!hdr) {
+		pr_warn("Can't find control domain for id=%d for CPU %d for resource %s\n",
+			id, cpu, r->name);
 		return;
 	}
+
+	if (WARN_ON_ONCE(hdr->type != RESCTRL_CTRL_DOMAIN))
+		return;
+
+	d = container_of(hdr, struct rdt_domain, hdr);
 	hw_dom = resctrl_to_arch_dom(d);
 
 	cpumask_clear_cpu(cpu, &d->hdr.cpu_mask);
 	if (cpumask_empty(&d->hdr.cpu_mask)) {
-		resctrl_offline_domain(r, d);
+		resctrl_offline_ctrl_domain(r, d);
 		list_del_rcu(&d->hdr.list);
 		synchronize_rcu();
 
@@ -601,6 +672,53 @@ static void domain_remove_cpu(int cpu, struct rdt_resource *r)
 	}
 }
 
+static void domain_remove_cpu_mon(int cpu, struct rdt_resource *r)
+{
+	int id = get_domain_id_from_scope(cpu, r->mon_scope);
+	struct rdt_hw_domain *hw_dom;
+	struct rdt_domain_hdr *hdr;
+	struct rdt_domain *d;
+
+	lockdep_assert_held(&domain_list_lock);
+
+	if (id < 0) {
+		pr_warn_once("Can't find monitor domain id for CPU:%d scope:%d for resource %s\n",
+			     cpu, r->mon_scope, r->name);
+		return;
+	}
+
+	hdr = rdt_find_domain(&r->mon_domains, id, NULL);
+	if (!hdr) {
+		pr_warn("Can't find monitor domain for id=%d for CPU %d for resource %s\n",
+			id, cpu, r->name);
+		return;
+	}
+
+	if (WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN))
+		return;
+
+	d = container_of(hdr, struct rdt_domain, hdr);
+	hw_dom = resctrl_to_arch_dom(d);
+
+	cpumask_clear_cpu(cpu, &d->hdr.cpu_mask);
+	if (cpumask_empty(&d->hdr.cpu_mask)) {
+		resctrl_offline_mon_domain(r, d);
+		list_del_rcu(&d->hdr.list);
+		synchronize_rcu();
+		domain_free(hw_dom);
+
+		return;
+	}
+}
+
+static void domain_remove_cpu(int cpu, struct rdt_resource *r)
+{
+	if (r->alloc_capable)
+		domain_remove_cpu_ctrl(cpu, r);
+	if (r->mon_capable)
+		domain_remove_cpu_mon(cpu, r);
+}
+
 static void clear_closid_rmid(int cpu)
 {
 	struct resctrl_pqr_state *state = this_cpu_ptr(&pqr_state);
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 1d8261e84362..9aceed827ff0 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -236,7 +236,7 @@ static int parse_line(char *line, struct resctrl_schema *s,
 		return -EINVAL;
 	}
 	dom = strim(dom);
-	list_for_each_entry(d, &r->domains, hdr.list) {
+	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
 		if (d->hdr.id == dom_id) {
 			data.buf = dom;
 			data.rdtgrp = rdtgrp;
@@ -311,7 +311,7 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 	/* Walking r->domains, ensure it can't race with cpuhp */
 	lockdep_assert_cpus_held();
 
-	list_for_each_entry(d, &r->domains, hdr.list) {
+	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
 		hw_dom = resctrl_to_arch_dom(d);
 		msr_param.res = NULL;
 		for (t = 0; t < CDP_NUM_TYPES; t++) {
@@ -455,7 +455,7 @@ static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int clo
 	lockdep_assert_cpus_held();
 
 	seq_printf(s, "%*s:", max_name_width, schema->name);
-	list_for_each_entry(dom, &r->domains, hdr.list) {
+	list_for_each_entry(dom, &r->ctrl_domains, hdr.list) {
 		if (sep)
 			seq_puts(s, ";");
 
@@ -561,6 +561,7 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 {
 	struct kernfs_open_file *of = m->private;
+	struct rdt_domain_hdr *hdr;
 	u32 resid, evtid, domid;
 	struct rdtgroup *rdtgrp;
 	struct rdt_resource *r;
@@ -581,11 +582,12 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 	evtid = md.u.evtid;
 
 	r = &rdt_resources_all[resid].r_resctrl;
-	d = rdt_find_domain(r, domid, NULL);
-	if (!d) {
+	hdr = rdt_find_domain(&r->mon_domains, domid, NULL);
+	if (!hdr || WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN)) {
 		ret = -ENOENT;
 		goto out;
 	}
+	d = container_of(hdr, struct rdt_domain, hdr);
 
 	mon_event_read(&rr, r, d, rdtgrp, evtid, false);
 
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index f1d926832ec8..377679b79919 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -558,8 +558,8 @@ void rdtgroup_kn_unlock(struct kernfs_node *kn);
 int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name);
 int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
 			     umode_t mask);
-struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
-				   struct list_head **pos);
+struct rdt_domain_hdr *rdt_find_domain(struct list_head *h, int id,
+				       struct list_head **pos);
 ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 				char *buf, size_t nbytes, loff_t off);
 int rdtgroup_schemata_show(struct kernfs_open_file *of,
@@ -578,7 +578,8 @@ int rdt_pseudo_lock_init(void);
 void rdt_pseudo_lock_release(void);
 int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
 void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
-struct rdt_domain *get_domain_from_cpu(int cpu, struct rdt_resource *r);
+struct rdt_domain *get_ctrl_domain_from_cpu(int cpu, struct rdt_resource *r);
+struct rdt_domain *get_mon_domain_from_cpu(int cpu, struct rdt_resource *r);
 int closids_supported(void);
 void closid_free(int closid);
 int alloc_rmid(u32 closid);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 4d7c596f9276..18ed3a6b0818 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -490,7 +490,7 @@ static void add_rmid_to_limbo(struct rmid_entry *entry)
 	idx = resctrl_arch_rmid_idx_encode(entry->closid, entry->rmid);
 
 	entry->busy = 0;
-	list_for_each_entry(d, &r->domains, hdr.list) {
+	list_for_each_entry(d, &r->mon_domains, hdr.list) {
 		/*
 		 * For the first limbo RMID in the domain,
 		 * setup up the limbo worker.
@@ -688,7 +688,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
 	idx = resctrl_arch_rmid_idx_encode(closid, rmid);
 	pmbm_data = &dom_mbm->mbm_local[idx];
 
-	dom_mba = get_domain_from_cpu(smp_processor_id(), r_mba);
+	dom_mba = get_ctrl_domain_from_cpu(smp_processor_id(), r_mba);
 	if (!dom_mba) {
 		pr_warn_once("Failure to get domain for MBA update\n");
 		return;
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index df45c839a58f..bdcf95f561d4 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -292,7 +292,7 @@ static void pseudo_lock_region_clear(struct pseudo_lock_region *plr)
  */
 static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
 {
-	enum resctrl_scope scope = plr->s->res->scope;
+	enum resctrl_scope scope = plr->s->res->ctrl_scope;
 	struct cacheinfo *ci;
 	int ret;
 
@@ -854,7 +854,7 @@ bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
 	 * associated with them.
 	 */
 	for_each_alloc_capable_rdt_resource(r) {
-		list_for_each_entry(d_i, &r->domains, hdr.list) {
+		list_for_each_entry(d_i, &r->ctrl_domains, hdr.list) {
 			if (d_i->plr)
 				cpumask_or(cpu_with_psl, cpu_with_psl,
 					   &d_i->hdr.cpu_mask);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index b6ba77cdf0e8..17d4610eecf5 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -98,7 +98,7 @@ void rdt_staged_configs_clear(void)
 	lockdep_assert_held(&rdtgroup_mutex);
 
 	for_each_alloc_capable_rdt_resource(r) {
-		list_for_each_entry(dom, &r->domains, hdr.list)
+		list_for_each_entry(dom, &r->ctrl_domains, hdr.list)
 			memset(dom->staged_config, 0, sizeof(dom->staged_config));
 	}
 }
@@ -1021,7 +1021,7 @@ static int rdt_bit_usage_show(struct kernfs_open_file *of,
 	cpus_read_lock();
 	mutex_lock(&rdtgroup_mutex);
 	hw_shareable = r->cache.shareable_bits;
-	list_for_each_entry(dom, &r->domains, hdr.list) {
+	list_for_each_entry(dom, &r->ctrl_domains, hdr.list) {
 		if (sep)
 			seq_putc(seq, ';');
 		sw_shareable = 0;
@@ -1343,7 +1343,7 @@ static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
 		if (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)
 			continue;
 		has_cache = true;
-		list_for_each_entry(d, &r->domains, hdr.list) {
+		list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
 			ctrl = resctrl_arch_get_config(r, d, closid,
 						       s->conf_type);
 			if (rdtgroup_cbm_overlaps(s, d, ctrl, closid, false)) {
@@ -1454,11 +1454,11 @@ unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
 	struct cacheinfo *ci;
 	int num_b;
 
-	if (WARN_ON_ONCE(r->scope != RESCTRL_L2_CACHE && r->scope != RESCTRL_L3_CACHE))
+	if (WARN_ON_ONCE(r->ctrl_scope != RESCTRL_L2_CACHE && r->ctrl_scope != RESCTRL_L3_CACHE))
 		return size;
 
 	num_b = bitmap_weight(&cbm, r->cache.cbm_len);
-	ci = get_cpu_cacheinfo_level(cpumask_any(&d->hdr.cpu_mask), r->scope);
+	ci = get_cpu_cacheinfo_level(cpumask_any(&d->hdr.cpu_mask), r->ctrl_scope);
 	if (ci)
 		size = ci->size / r->cache.cbm_len * num_b;
 
@@ -1514,7 +1514,7 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 		type = schema->conf_type;
 		sep = false;
 		seq_printf(s, "%*s:", max_name_width, schema->name);
-		list_for_each_entry(d, &r->domains, hdr.list) {
+		list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
 			if (sep)
 				seq_putc(s, ';');
 			if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
@@ -1604,7 +1604,7 @@ static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid
 	cpus_read_lock();
 	mutex_lock(&rdtgroup_mutex);
 
-	list_for_each_entry(dom, &r->domains, hdr.list) {
+	list_for_each_entry(dom, &r->mon_domains, hdr.list) {
 		if (sep)
 			seq_puts(s, ";");
 
@@ -1728,7 +1728,7 @@ static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
 		return -EINVAL;
 	}
 
-	list_for_each_entry(d, &r->domains, hdr.list) {
+	list_for_each_entry(d, &r->mon_domains, hdr.list) {
 		if (d->hdr.id == dom_id) {
 			mbm_config_write_domain(r, d, evtid, val);
 			goto next;
@@ -2276,7 +2276,7 @@ static int set_cache_qos_cfg(int level, bool enable)
 		return -ENOMEM;
 
 	r_l = &rdt_resources_all[level].r_resctrl;
-	list_for_each_entry(d, &r_l->domains, hdr.list) {
+	list_for_each_entry(d, &r_l->ctrl_domains, hdr.list) {
 		if (r_l->cache.arch_has_per_cpu_cfg)
 			/* Pick all the CPUs in the domain instance */
 			for_each_cpu(cpu, &d->hdr.cpu_mask)
@@ -2361,7 +2361,7 @@ static int set_mba_sc(bool mba_sc)
 
 	r->membw.mba_sc = mba_sc;
 
-	list_for_each_entry(d, &r->domains, hdr.list) {
+	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
 		for (i = 0; i < num_closid; i++)
 			d->mbps_val[i] = MBA_MAX_MBPS;
 	}
@@ -2700,7 +2700,7 @@ static int rdt_get_tree(struct fs_context *fc)
 
 	if (is_mbm_enabled()) {
 		r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
-		list_for_each_entry(dom, &r->domains, hdr.list)
+		list_for_each_entry(dom, &r->mon_domains, hdr.list)
 			mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL,
 						   RESCTRL_PICK_ANY_CPU);
 	}
@@ -2824,10 +2824,10 @@ static int reset_all_ctrls(struct rdt_resource *r)
 
 	/*
 	 * Disable resource control for this resource by setting all
-	 * CBMs in all domains to the maximum mask value. Pick one CPU
+	 * CBMs in all ctrl_domains to the maximum mask value. Pick one CPU
 	 * from each domain to update the MSRs below.
 	 */
-	list_for_each_entry(d, &r->domains, hdr.list) {
+	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
 		hw_dom = resctrl_to_arch_dom(d);
 
 		for (i = 0; i < hw_res->num_closid; i++)
@@ -3098,7 +3098,7 @@ static int mkdir_mondata_subdir_alldom(struct kernfs_node *parent_kn,
 	/* Walking r->domains, ensure it can't race with cpuhp */
 	lockdep_assert_cpus_held();
 
-	list_for_each_entry(dom, &r->domains, hdr.list) {
+	list_for_each_entry(dom, &r->mon_domains, hdr.list) {
 		ret = mkdir_mondata_subdir(parent_kn, dom, r, prgrp);
 		if (ret)
 			return ret;
@@ -3280,7 +3280,7 @@ static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
 	struct rdt_domain *d;
 	int ret;
 
-	list_for_each_entry(d, &s->res->domains, hdr.list) {
+	list_for_each_entry(d, &s->res->ctrl_domains, hdr.list) {
 		ret = __init_one_rdt_domain(d, s, closid);
 		if (ret < 0)
 			return ret;
@@ -3295,7 +3295,7 @@ static void rdtgroup_init_mba(struct rdt_resource *r, u32 closid)
 	struct resctrl_staged_config *cfg;
 	struct rdt_domain *d;
 
-	list_for_each_entry(d, &r->domains, hdr.list) {
+	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
 		if (is_mba_sc(r)) {
 			d->mbps_val[closid] = MBA_MAX_MBPS;
 			continue;
@@ -3926,15 +3926,19 @@ static void domain_destroy_mon_state(struct rdt_domain *d)
 	kfree(d->mbm_local);
 }
 
-void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d)
+void resctrl_offline_ctrl_domain(struct rdt_resource *r, struct rdt_domain *d)
 {
 	mutex_lock(&rdtgroup_mutex);
 
 	if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA)
 		mba_sc_domain_destroy(r, d);
 
-	if (!r->mon_capable)
-		goto out_unlock;
+	mutex_unlock(&rdtgroup_mutex);
+}
+
+void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_domain *d)
+{
+	mutex_lock(&rdtgroup_mutex);
 
 	/*
 	 * If resctrl is mounted, remove all the
@@ -3960,7 +3964,6 @@ void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d)
 
 	domain_destroy_mon_state(d);
 
-out_unlock:
 	mutex_unlock(&rdtgroup_mutex);
 }
 
@@ -3995,7 +3998,7 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
 	return 0;
 }
 
-int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d)
+int resctrl_online_ctrl_domain(struct rdt_resource *r, struct rdt_domain *d)
 {
 	int err = 0;
 
@@ -4004,11 +4007,18 @@ int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d)
 	if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA) {
 		/* RDT_RESOURCE_MBA is never mon_capable */
 		err = mba_sc_domain_allocate(r, d);
-		goto out_unlock;
 	}
 
-	if (!r->mon_capable)
-		goto out_unlock;
+	mutex_unlock(&rdtgroup_mutex);
+
+	return err;
+}
+
+int resctrl_online_mon_domain(struct rdt_resource *r, struct rdt_domain *d)
+{
+	int err;
+
+	mutex_lock(&rdtgroup_mutex);
 
 	err = domain_setup_mon_state(r, d);
 	if (err)
@@ -4073,7 +4083,7 @@ void resctrl_offline_cpu(unsigned int cpu)
 	if (!l3->mon_capable)
 		goto out_unlock;
 
-	d = get_domain_from_cpu(cpu, l3);
+	d = get_mon_domain_from_cpu(cpu, l3);
 	if (d) {
 		if (is_mbm_enabled() && cpu == d->mbm_work_cpu) {
 			cancel_delayed_work(&d->mbm_over);
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index f63fcf17a3bc..96ddf9ff3183 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -58,15 +58,22 @@ struct resctrl_staged_config {
 	bool			have_new_ctrl;
 };
 
+enum resctrl_domain_type {
+	RESCTRL_CTRL_DOMAIN,
+	RESCTRL_MON_DOMAIN,
+};
+
 /**
  * struct rdt_domain_hdr - common header for different domain types
  * @list:		all instances of this resource
  * @id:			unique id for this instance
+ * @type:		type of this instance
  * @cpu_mask:		which CPUs share this resource
  */
 struct rdt_domain_hdr {
 	struct list_head		list;
 	int				id;
+	enum resctrl_domain_type	type;
 	struct cpumask			cpu_mask;
 };
 
@@ -169,10 +176,12 @@ enum resctrl_scope {
  * @alloc_capable:	Is allocation available on this machine
  * @mon_capable:	Is monitor feature available on this machine
  * @num_rmid:		Number of RMIDs available
- * @scope:		Scope of this resource
+ * @ctrl_scope:		Scope of this resource for control functions
+ * @mon_scope:		Scope of this resource for monitor functions
  * @cache:		Cache allocation related data
  * @membw:		If the component has bandwidth controls, their properties.
- * @domains:		RCU list of all domains for this resource
+ * @ctrl_domains:	RCU list of all control domains for this resource
+ * @mon_domains:	RCU list of all monitor domains for this resource
  * @name:		Name to use in "schemata" file.
  * @data_width:		Character width of data when displaying
  * @default_ctrl:	Specifies default cache cbm or memory B/W percent.
@@ -187,10 +196,12 @@ struct rdt_resource {
 	bool			alloc_capable;
 	bool			mon_capable;
 	int			num_rmid;
-	enum resctrl_scope	scope;
+	enum resctrl_scope	ctrl_scope;
+	enum resctrl_scope	mon_scope;
 	struct resctrl_cache	cache;
 	struct resctrl_membw	membw;
-	struct list_head	domains;
+	struct list_head	ctrl_domains;
+	struct list_head	mon_domains;
 	char			*name;
 	int			data_width;
 	u32			default_ctrl;
@@ -236,8 +247,10 @@ int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
 
 u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
 			    u32 closid, enum resctrl_conf_type type);
-int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d);
-void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d);
+int resctrl_online_ctrl_domain(struct rdt_resource *r, struct rdt_domain *d);
+int resctrl_online_mon_domain(struct rdt_resource *r, struct rdt_domain *d);
+void resctrl_offline_ctrl_domain(struct rdt_resource *r, struct rdt_domain *d);
+void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_domain *d);
 void resctrl_online_cpu(unsigned int cpu);
 void resctrl_offline_cpu(unsigned int cpu);
 
-- 
Gitee


From 5fc33e46c66d62ba4dc0518da69d183d628a9393 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:04 -0700
Subject: [PATCH 173/280] x86/resctrl: Split the rdt_domain and rdt_hw_domain
 structures

ANBZ: #31045

commit cae2bcb6a2c691ef7b537ad07e9819a5ed645bcc upstream.

The same rdt_domain structure is used for both control and monitor
functions. But this results in wasted memory as some of the fields are
only used by control functions, while most are only used for monitor
functions.

Split into separate rdt_ctrl_domain and rdt_mon_domain structures with
just the fields required for control and monitoring respectively.

Similar split of the rdt_hw_domain structure into rdt_hw_ctrl_domain
and rdt_hw_mon_domain.

Intel-SIG: commit cae2bcb6a2c6 x86/resctrl: Split the rdt_domain and rdt_hw_domain structures.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-5-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        | 71 ++++++++++++-----------
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 28 ++++-----
 arch/x86/kernel/cpu/resctrl/internal.h    | 62 ++++++++++++--------
 arch/x86/kernel/cpu/resctrl/monitor.c     | 40 ++++++-------
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c |  6 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 64 ++++++++++----------
 include/linux/resctrl.h                   | 48 ++++++++-------
 7 files changed, 174 insertions(+), 145 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 9d513e2e47e9..cef224de2dea 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -309,8 +309,8 @@ static void rdt_get_cdp_l2_config(void)
 
 static void mba_wrmsr_amd(struct msr_param *m)
 {
+	struct rdt_hw_ctrl_domain *hw_dom = resctrl_to_arch_ctrl_dom(m->dom);
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(m->res);
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(m->dom);
 	unsigned int i;
 
 	for (i = m->low; i < m->high; i++)
@@ -333,8 +333,8 @@ static u32 delay_bw_map(unsigned long bw, struct rdt_resource *r)
 
 static void mba_wrmsr_intel(struct msr_param *m)
 {
+	struct rdt_hw_ctrl_domain *hw_dom = resctrl_to_arch_ctrl_dom(m->dom);
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(m->res);
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(m->dom);
 	unsigned int i;
 
 	/*  Write the delay values for mba. */
@@ -344,17 +344,17 @@ static void mba_wrmsr_intel(struct msr_param *m)
 
 static void cat_wrmsr(struct msr_param *m)
 {
+	struct rdt_hw_ctrl_domain *hw_dom = resctrl_to_arch_ctrl_dom(m->dom);
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(m->res);
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(m->dom);
 	unsigned int i;
 
 	for (i = m->low; i < m->high; i++)
 		wrmsrl(hw_res->msr_base + i, hw_dom->ctrl_val[i]);
 }
 
-struct rdt_domain *get_ctrl_domain_from_cpu(int cpu, struct rdt_resource *r)
+struct rdt_ctrl_domain *get_ctrl_domain_from_cpu(int cpu, struct rdt_resource *r)
 {
-	struct rdt_domain *d;
+	struct rdt_ctrl_domain *d;
 
 	lockdep_assert_cpus_held();
 
@@ -367,9 +367,9 @@ struct rdt_domain *get_ctrl_domain_from_cpu(int cpu, struct rdt_resource *r)
 	return NULL;
 }
 
-struct rdt_domain *get_mon_domain_from_cpu(int cpu, struct rdt_resource *r)
+struct rdt_mon_domain *get_mon_domain_from_cpu(int cpu, struct rdt_resource *r)
 {
-	struct rdt_domain *d;
+	struct rdt_mon_domain *d;
 
 	lockdep_assert_cpus_held();
 
@@ -440,18 +440,23 @@ static void setup_default_ctrlval(struct rdt_resource *r, u32 *dc)
 		*dc = r->default_ctrl;
 }
 
-static void domain_free(struct rdt_hw_domain *hw_dom)
+static void ctrl_domain_free(struct rdt_hw_ctrl_domain *hw_dom)
+{
+	kfree(hw_dom->ctrl_val);
+	kfree(hw_dom);
+}
+
+static void mon_domain_free(struct rdt_hw_mon_domain *hw_dom)
 {
 	kfree(hw_dom->arch_mbm_total);
 	kfree(hw_dom->arch_mbm_local);
-	kfree(hw_dom->ctrl_val);
 	kfree(hw_dom);
 }
 
-static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
+static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_ctrl_domain *d)
 {
+	struct rdt_hw_ctrl_domain *hw_dom = resctrl_to_arch_ctrl_dom(d);
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
 	struct msr_param m;
 	u32 *dc;
 
@@ -476,7 +481,7 @@ static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
  * @num_rmid:	The size of the MBM counter array
  * @hw_dom:	The domain that owns the allocated arrays
  */
-static int arch_domain_mbm_alloc(u32 num_rmid, struct rdt_hw_domain *hw_dom)
+static int arch_domain_mbm_alloc(u32 num_rmid, struct rdt_hw_mon_domain *hw_dom)
 {
 	size_t tsize;
 
@@ -515,10 +520,10 @@ static int get_domain_id_from_scope(int cpu, enum resctrl_scope scope)
 static void domain_add_cpu_ctrl(int cpu, struct rdt_resource *r)
 {
 	int id = get_domain_id_from_scope(cpu, r->ctrl_scope);
+	struct rdt_hw_ctrl_domain *hw_dom;
 	struct list_head *add_pos = NULL;
-	struct rdt_hw_domain *hw_dom;
 	struct rdt_domain_hdr *hdr;
-	struct rdt_domain *d;
+	struct rdt_ctrl_domain *d;
 	int err;
 
 	lockdep_assert_held(&domain_list_lock);
@@ -533,7 +538,7 @@ static void domain_add_cpu_ctrl(int cpu, struct rdt_resource *r)
 	if (hdr) {
 		if (WARN_ON_ONCE(hdr->type != RESCTRL_CTRL_DOMAIN))
 			return;
-		d = container_of(hdr, struct rdt_domain, hdr);
+		d = container_of(hdr, struct rdt_ctrl_domain, hdr);
 
 		cpumask_set_cpu(cpu, &d->hdr.cpu_mask);
 		if (r->cache.arch_has_per_cpu_cfg)
@@ -553,7 +558,7 @@ static void domain_add_cpu_ctrl(int cpu, struct rdt_resource *r)
 	rdt_domain_reconfigure_cdp(r);
 
 	if (domain_setup_ctrlval(r, d)) {
-		domain_free(hw_dom);
+		ctrl_domain_free(hw_dom);
 		return;
 	}
 
@@ -563,7 +568,7 @@ static void domain_add_cpu_ctrl(int cpu, struct rdt_resource *r)
 	if (err) {
 		list_del_rcu(&d->hdr.list);
 		synchronize_rcu();
-		domain_free(hw_dom);
+		ctrl_domain_free(hw_dom);
 	}
 }
 
@@ -571,9 +576,9 @@ static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
 {
 	int id = get_domain_id_from_scope(cpu, r->mon_scope);
 	struct list_head *add_pos = NULL;
-	struct rdt_hw_domain *hw_dom;
+	struct rdt_hw_mon_domain *hw_dom;
 	struct rdt_domain_hdr *hdr;
-	struct rdt_domain *d;
+	struct rdt_mon_domain *d;
 	int err;
 
 	lockdep_assert_held(&domain_list_lock);
@@ -588,7 +593,7 @@ static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
 	if (hdr) {
 		if (WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN))
 			return;
-		d = container_of(hdr, struct rdt_domain, hdr);
+		d = container_of(hdr, struct rdt_mon_domain, hdr);
 
 		cpumask_set_cpu(cpu, &d->hdr.cpu_mask);
 		return;
@@ -604,7 +609,7 @@ static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
 	cpumask_set_cpu(cpu, &d->hdr.cpu_mask);
 
 	if (arch_domain_mbm_alloc(r->num_rmid, hw_dom)) {
-		domain_free(hw_dom);
+		mon_domain_free(hw_dom);
 		return;
 	}
 
@@ -614,7 +619,7 @@ static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
 	if (err) {
 		list_del_rcu(&d->hdr.list);
 		synchronize_rcu();
-		domain_free(hw_dom);
+		mon_domain_free(hw_dom);
 	}
 }
 
@@ -629,9 +634,9 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 static void domain_remove_cpu_ctrl(int cpu, struct rdt_resource *r)
 {
 	int id = get_domain_id_from_scope(cpu, r->ctrl_scope);
-	struct rdt_hw_domain *hw_dom;
+	struct rdt_hw_ctrl_domain *hw_dom;
 	struct rdt_domain_hdr *hdr;
-	struct rdt_domain *d;
+	struct rdt_ctrl_domain *d;
 
 	lockdep_assert_held(&domain_list_lock);
 
@@ -651,8 +656,8 @@ static void domain_remove_cpu_ctrl(int cpu, struct rdt_resource *r)
 	if (WARN_ON_ONCE(hdr->type != RESCTRL_CTRL_DOMAIN))
 		return;
 
-	d = container_of(hdr, struct rdt_domain, hdr);
-	hw_dom = resctrl_to_arch_dom(d);
+	d = container_of(hdr, struct rdt_ctrl_domain, hdr);
+	hw_dom = resctrl_to_arch_ctrl_dom(d);
 
 	cpumask_clear_cpu(cpu, &d->hdr.cpu_mask);
 	if (cpumask_empty(&d->hdr.cpu_mask)) {
@@ -661,12 +666,12 @@ static void domain_remove_cpu_ctrl(int cpu, struct rdt_resource *r)
 		synchronize_rcu();
 
 		/*
-		 * rdt_domain "d" is going to be freed below, so clear
+		 * rdt_ctrl_domain "d" is going to be freed below, so clear
 		 * its pointer from pseudo_lock_region struct.
 		 */
 		if (d->plr)
 			d->plr->d = NULL;
-		domain_free(hw_dom);
+		ctrl_domain_free(hw_dom);
 
 		return;
 	}
@@ -675,9 +680,9 @@ static void domain_remove_cpu_ctrl(int cpu, struct rdt_resource *r)
 static void domain_remove_cpu_mon(int cpu, struct rdt_resource *r)
 {
 	int id = get_domain_id_from_scope(cpu, r->mon_scope);
-	struct rdt_hw_domain *hw_dom;
+	struct rdt_hw_mon_domain *hw_dom;
 	struct rdt_domain_hdr *hdr;
-	struct rdt_domain *d;
+	struct rdt_mon_domain *d;
 
 	lockdep_assert_held(&domain_list_lock);
 
@@ -697,15 +702,15 @@ static void domain_remove_cpu_mon(int cpu, struct rdt_resource *r)
 	if (WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN))
 		return;
 
-	d = container_of(hdr, struct rdt_domain, hdr);
-	hw_dom = resctrl_to_arch_dom(d);
+	d = container_of(hdr, struct rdt_mon_domain, hdr);
+	hw_dom = resctrl_to_arch_mon_dom(d);
 
 	cpumask_clear_cpu(cpu, &d->hdr.cpu_mask);
 	if (cpumask_empty(&d->hdr.cpu_mask)) {
 		resctrl_offline_mon_domain(r, d);
 		list_del_rcu(&d->hdr.list);
 		synchronize_rcu();
-		domain_free(hw_dom);
+		mon_domain_free(hw_dom);
 
 		return;
 	}
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 9aceed827ff0..97e554e36f07 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -65,7 +65,7 @@ static bool bw_validate(char *buf, u32 *data, struct rdt_resource *r)
 }
 
 int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
-	     struct rdt_domain *d)
+	     struct rdt_ctrl_domain *d)
 {
 	struct resctrl_staged_config *cfg;
 	u32 closid = data->rdtgrp->closid;
@@ -144,7 +144,7 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
  * resource type.
  */
 int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
-	      struct rdt_domain *d)
+	      struct rdt_ctrl_domain *d)
 {
 	struct rdtgroup *rdtgrp = data->rdtgrp;
 	struct resctrl_staged_config *cfg;
@@ -213,8 +213,8 @@ static int parse_line(char *line, struct resctrl_schema *s,
 	struct resctrl_staged_config *cfg;
 	struct rdt_resource *r = s->res;
 	struct rdt_parse_data data;
+	struct rdt_ctrl_domain *d;
 	char *dom = NULL, *id;
-	struct rdt_domain *d;
 	unsigned long dom_id;
 
 	/* Walking r->domains, ensure it can't race with cpuhp */
@@ -277,11 +277,11 @@ static u32 get_config_index(u32 closid, enum resctrl_conf_type type)
 	}
 }
 
-int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
+int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_ctrl_domain *d,
 			    u32 closid, enum resctrl_conf_type t, u32 cfg_val)
 {
+	struct rdt_hw_ctrl_domain *hw_dom = resctrl_to_arch_ctrl_dom(d);
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
 	u32 idx = get_config_index(closid, t);
 	struct msr_param msr_param;
 
@@ -302,17 +302,17 @@ int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
 int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 {
 	struct resctrl_staged_config *cfg;
-	struct rdt_hw_domain *hw_dom;
+	struct rdt_hw_ctrl_domain *hw_dom;
 	struct msr_param msr_param;
+	struct rdt_ctrl_domain *d;
 	enum resctrl_conf_type t;
-	struct rdt_domain *d;
 	u32 idx;
 
 	/* Walking r->domains, ensure it can't race with cpuhp */
 	lockdep_assert_cpus_held();
 
 	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
-		hw_dom = resctrl_to_arch_dom(d);
+		hw_dom = resctrl_to_arch_ctrl_dom(d);
 		msr_param.res = NULL;
 		for (t = 0; t < CDP_NUM_TYPES; t++) {
 			cfg = &hw_dom->d_resctrl.staged_config[t];
@@ -435,10 +435,10 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 	return ret ?: nbytes;
 }
 
-u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
+u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_ctrl_domain *d,
 			    u32 closid, enum resctrl_conf_type type)
 {
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
+	struct rdt_hw_ctrl_domain *hw_dom = resctrl_to_arch_ctrl_dom(d);
 	u32 idx = get_config_index(closid, type);
 
 	return hw_dom->ctrl_val[idx];
@@ -447,7 +447,7 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
 static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
 {
 	struct rdt_resource *r = schema->res;
-	struct rdt_domain *dom;
+	struct rdt_ctrl_domain *dom;
 	bool sep = false;
 	u32 ctrl_val;
 
@@ -519,7 +519,7 @@ static int smp_mon_event_count(void *arg)
 }
 
 void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
-		    struct rdt_domain *d, struct rdtgroup *rdtgrp,
+		    struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
 		    int evtid, int first)
 {
 	int cpu;
@@ -562,11 +562,11 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 {
 	struct kernfs_open_file *of = m->private;
 	struct rdt_domain_hdr *hdr;
+	struct rdt_mon_domain *d;
 	u32 resid, evtid, domid;
 	struct rdtgroup *rdtgrp;
 	struct rdt_resource *r;
 	union mon_data_bits md;
-	struct rdt_domain *d;
 	struct rmid_read rr;
 	int ret = 0;
 
@@ -587,7 +587,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 		ret = -ENOENT;
 		goto out;
 	}
-	d = container_of(hdr, struct rdt_domain, hdr);
+	d = container_of(hdr, struct rdt_mon_domain, hdr);
 
 	mon_event_read(&rr, r, d, rdtgrp, evtid, false);
 
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 377679b79919..135190e0711c 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -147,7 +147,7 @@ union mon_data_bits {
 struct rmid_read {
 	struct rdtgroup		*rgrp;
 	struct rdt_resource	*r;
-	struct rdt_domain	*d;
+	struct rdt_mon_domain	*d;
 	enum resctrl_event_id	evtid;
 	bool			first;
 	int			err;
@@ -232,7 +232,7 @@ struct mongroup {
  */
 struct pseudo_lock_region {
 	struct resctrl_schema	*s;
-	struct rdt_domain	*d;
+	struct rdt_ctrl_domain	*d;
 	u32			cbm;
 	wait_queue_head_t	lock_thread_wq;
 	int			thread_done;
@@ -355,25 +355,41 @@ struct arch_mbm_state {
 };
 
 /**
- * struct rdt_hw_domain - Arch private attributes of a set of CPUs that share
- *			  a resource
+ * struct rdt_hw_ctrl_domain - Arch private attributes of a set of CPUs that share
+ *			       a resource for a control function
  * @d_resctrl:	Properties exposed to the resctrl file system
  * @ctrl_val:	array of cache or mem ctrl values (indexed by CLOSID)
+ *
+ * Members of this structure are accessed via helpers that provide abstraction.
+ */
+struct rdt_hw_ctrl_domain {
+	struct rdt_ctrl_domain		d_resctrl;
+	u32				*ctrl_val;
+};
+
+/**
+ * struct rdt_hw_mon_domain - Arch private attributes of a set of CPUs that share
+ *			      a resource for a monitor function
+ * @d_resctrl:	Properties exposed to the resctrl file system
  * @arch_mbm_total:	arch private state for MBM total bandwidth
  * @arch_mbm_local:	arch private state for MBM local bandwidth
  *
  * Members of this structure are accessed via helpers that provide abstraction.
  */
-struct rdt_hw_domain {
-	struct rdt_domain		d_resctrl;
-	u32				*ctrl_val;
+struct rdt_hw_mon_domain {
+	struct rdt_mon_domain		d_resctrl;
 	struct arch_mbm_state		*arch_mbm_total;
 	struct arch_mbm_state		*arch_mbm_local;
 };
 
-static inline struct rdt_hw_domain *resctrl_to_arch_dom(struct rdt_domain *r)
+static inline struct rdt_hw_ctrl_domain *resctrl_to_arch_ctrl_dom(struct rdt_ctrl_domain *r)
+{
+	return container_of(r, struct rdt_hw_ctrl_domain, d_resctrl);
+}
+
+static inline struct rdt_hw_mon_domain *resctrl_to_arch_mon_dom(struct rdt_mon_domain *r)
 {
-	return container_of(r, struct rdt_hw_domain, d_resctrl);
+	return container_of(r, struct rdt_hw_mon_domain, d_resctrl);
 }
 
 /**
@@ -385,7 +401,7 @@ static inline struct rdt_hw_domain *resctrl_to_arch_dom(struct rdt_domain *r)
  */
 struct msr_param {
 	struct rdt_resource	*res;
-	struct rdt_domain	*dom;
+	struct rdt_ctrl_domain	*dom;
 	u32			low;
 	u32			high;
 };
@@ -458,9 +474,9 @@ static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r
 }
 
 int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
-	      struct rdt_domain *d);
+	      struct rdt_ctrl_domain *d);
 int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
-	     struct rdt_domain *d);
+	     struct rdt_ctrl_domain *d);
 
 extern struct mutex rdtgroup_mutex;
 
@@ -564,22 +580,22 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 				char *buf, size_t nbytes, loff_t off);
 int rdtgroup_schemata_show(struct kernfs_open_file *of,
 			   struct seq_file *s, void *v);
-bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
+bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_ctrl_domain *d,
 			   unsigned long cbm, int closid, bool exclusive);
-unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_domain *d,
+unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_ctrl_domain *d,
 				  unsigned long cbm);
 enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
 int rdtgroup_tasks_assigned(struct rdtgroup *r);
 int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
 int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp);
-bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm);
-bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d);
+bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_ctrl_domain *d, unsigned long cbm);
+bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_ctrl_domain *d);
 int rdt_pseudo_lock_init(void);
 void rdt_pseudo_lock_release(void);
 int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
 void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
-struct rdt_domain *get_ctrl_domain_from_cpu(int cpu, struct rdt_resource *r);
-struct rdt_domain *get_mon_domain_from_cpu(int cpu, struct rdt_resource *r);
+struct rdt_ctrl_domain *get_ctrl_domain_from_cpu(int cpu, struct rdt_resource *r);
+struct rdt_mon_domain *get_mon_domain_from_cpu(int cpu, struct rdt_resource *r);
 int closids_supported(void);
 void closid_free(int closid);
 int alloc_rmid(u32 closid);
@@ -590,19 +606,19 @@ bool __init rdt_cpu_has(int flag);
 void mon_event_count(void *info);
 int rdtgroup_mondata_show(struct seq_file *m, void *arg);
 void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
-		    struct rdt_domain *d, struct rdtgroup *rdtgrp,
+		    struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
 		    int evtid, int first);
-void mbm_setup_overflow_handler(struct rdt_domain *dom,
+void mbm_setup_overflow_handler(struct rdt_mon_domain *dom,
 				unsigned long delay_ms,
 				int exclude_cpu);
 void mbm_handle_overflow(struct work_struct *work);
 void __init intel_rdt_mbm_apply_quirk(void);
 bool is_mba_sc(struct rdt_resource *r);
-void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms,
+void cqm_setup_limbo_handler(struct rdt_mon_domain *dom, unsigned long delay_ms,
 			     int exclude_cpu);
 void cqm_handle_limbo(struct work_struct *work);
-bool has_busy_rmid(struct rdt_domain *d);
-void __check_limbo(struct rdt_domain *d, bool force_free);
+bool has_busy_rmid(struct rdt_mon_domain *d);
+void __check_limbo(struct rdt_mon_domain *d, bool force_free);
 void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
 void __init thread_throttle_mode_init(void);
 void __init mbm_config_rftype_init(const char *config);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 18ed3a6b0818..2f5d35f0716f 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -209,7 +209,7 @@ static int __rmid_read(u32 rmid, enum resctrl_event_id eventid, u64 *val)
 	return 0;
 }
 
-static struct arch_mbm_state *get_arch_mbm_state(struct rdt_hw_domain *hw_dom,
+static struct arch_mbm_state *get_arch_mbm_state(struct rdt_hw_mon_domain *hw_dom,
 						 u32 rmid,
 						 enum resctrl_event_id eventid)
 {
@@ -228,11 +228,11 @@ static struct arch_mbm_state *get_arch_mbm_state(struct rdt_hw_domain *hw_dom,
 	return NULL;
 }
 
-void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_domain *d,
+void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_mon_domain *d,
 			     u32 unused, u32 rmid,
 			     enum resctrl_event_id eventid)
 {
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
+	struct rdt_hw_mon_domain *hw_dom = resctrl_to_arch_mon_dom(d);
 	struct arch_mbm_state *am;
 
 	am = get_arch_mbm_state(hw_dom, rmid, eventid);
@@ -248,9 +248,9 @@ void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_domain *d,
  * Assumes that hardware counters are also reset and thus that there is
  * no need to record initial non-zero counts.
  */
-void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_domain *d)
+void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_mon_domain *d)
 {
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
+	struct rdt_hw_mon_domain *hw_dom = resctrl_to_arch_mon_dom(d);
 
 	if (is_mbm_total_enabled())
 		memset(hw_dom->arch_mbm_total, 0,
@@ -269,12 +269,12 @@ static u64 mbm_overflow_count(u64 prev_msr, u64 cur_msr, unsigned int width)
 	return chunks >> shift;
 }
 
-int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
+int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_mon_domain *d,
 			   u32 unused, u32 rmid, enum resctrl_event_id eventid,
 			   u64 *val, void *ignored)
 {
+	struct rdt_hw_mon_domain *hw_dom = resctrl_to_arch_mon_dom(d);
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
 	struct arch_mbm_state *am;
 	u64 msr_val, chunks;
 	int ret;
@@ -320,7 +320,7 @@ static void limbo_release_entry(struct rmid_entry *entry)
  * decrement the count. If the busy count gets to zero on an RMID, we
  * free the RMID
  */
-void __check_limbo(struct rdt_domain *d, bool force_free)
+void __check_limbo(struct rdt_mon_domain *d, bool force_free)
 {
 	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
 	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
@@ -378,7 +378,7 @@ void __check_limbo(struct rdt_domain *d, bool force_free)
 	resctrl_arch_mon_ctx_free(r, QOS_L3_OCCUP_EVENT_ID, arch_mon_ctx);
 }
 
-bool has_busy_rmid(struct rdt_domain *d)
+bool has_busy_rmid(struct rdt_mon_domain *d)
 {
 	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
 
@@ -479,7 +479,7 @@ int alloc_rmid(u32 closid)
 static void add_rmid_to_limbo(struct rmid_entry *entry)
 {
 	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
-	struct rdt_domain *d;
+	struct rdt_mon_domain *d;
 	u32 idx;
 
 	lockdep_assert_held(&rdtgroup_mutex);
@@ -532,7 +532,7 @@ void free_rmid(u32 closid, u32 rmid)
 		list_add_tail(&entry->list, &rmid_free_lru);
 }
 
-static struct mbm_state *get_mbm_state(struct rdt_domain *d, u32 closid,
+static struct mbm_state *get_mbm_state(struct rdt_mon_domain *d, u32 closid,
 				       u32 rmid, enum resctrl_event_id evtid)
 {
 	u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
@@ -668,12 +668,12 @@ void mon_event_count(void *info)
  * throttle MSRs already have low percentage values.  To avoid
  * unnecessarily restricting such rdtgroups, we also increase the bandwidth.
  */
-static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
+static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_mon_domain *dom_mbm)
 {
 	u32 closid, rmid, cur_msr_val, new_msr_val;
 	struct mbm_state *pmbm_data, *cmbm_data;
+	struct rdt_ctrl_domain *dom_mba;
 	struct rdt_resource *r_mba;
-	struct rdt_domain *dom_mba;
 	u32 cur_bw, user_bw, idx;
 	struct list_head *head;
 	struct rdtgroup *entry;
@@ -734,7 +734,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
 	resctrl_arch_update_one(r_mba, dom_mba, closid, CDP_NONE, new_msr_val);
 }
 
-static void mbm_update(struct rdt_resource *r, struct rdt_domain *d,
+static void mbm_update(struct rdt_resource *r, struct rdt_mon_domain *d,
 		       u32 closid, u32 rmid)
 {
 	struct rmid_read rr;
@@ -792,12 +792,12 @@ static void mbm_update(struct rdt_resource *r, struct rdt_domain *d,
 void cqm_handle_limbo(struct work_struct *work)
 {
 	unsigned long delay = msecs_to_jiffies(CQM_LIMBOCHECK_INTERVAL);
-	struct rdt_domain *d;
+	struct rdt_mon_domain *d;
 
 	cpus_read_lock();
 	mutex_lock(&rdtgroup_mutex);
 
-	d = container_of(work, struct rdt_domain, cqm_limbo.work);
+	d = container_of(work, struct rdt_mon_domain, cqm_limbo.work);
 
 	__check_limbo(d, false);
 
@@ -820,7 +820,7 @@ void cqm_handle_limbo(struct work_struct *work)
  * @exclude_cpu:   Which CPU the handler should not run on,
  *		   RESCTRL_PICK_ANY_CPU to pick any CPU.
  */
-void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms,
+void cqm_setup_limbo_handler(struct rdt_mon_domain *dom, unsigned long delay_ms,
 			     int exclude_cpu)
 {
 	unsigned long delay = msecs_to_jiffies(delay_ms);
@@ -837,9 +837,9 @@ void mbm_handle_overflow(struct work_struct *work)
 {
 	unsigned long delay = msecs_to_jiffies(MBM_OVERFLOW_INTERVAL);
 	struct rdtgroup *prgrp, *crgrp;
+	struct rdt_mon_domain *d;
 	struct list_head *head;
 	struct rdt_resource *r;
-	struct rdt_domain *d;
 
 	cpus_read_lock();
 	mutex_lock(&rdtgroup_mutex);
@@ -852,7 +852,7 @@ void mbm_handle_overflow(struct work_struct *work)
 		goto out_unlock;
 
 	r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
-	d = container_of(work, struct rdt_domain, mbm_over.work);
+	d = container_of(work, struct rdt_mon_domain, mbm_over.work);
 
 	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
 		mbm_update(r, d, prgrp->closid, prgrp->mon.rmid);
@@ -886,7 +886,7 @@ void mbm_handle_overflow(struct work_struct *work)
  * @exclude_cpu:   Which CPU the handler should not run on,
  *		   RESCTRL_PICK_ANY_CPU to pick any CPU.
  */
-void mbm_setup_overflow_handler(struct rdt_domain *dom, unsigned long delay_ms,
+void mbm_setup_overflow_handler(struct rdt_mon_domain *dom, unsigned long delay_ms,
 				int exclude_cpu)
 {
 	unsigned long delay = msecs_to_jiffies(delay_ms);
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index bdcf95f561d4..70f0069b87d8 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -809,7 +809,7 @@ int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
  * Return: true if @cbm overlaps with pseudo-locked region on @d, false
  * otherwise.
  */
-bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm)
+bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_ctrl_domain *d, unsigned long cbm)
 {
 	unsigned int cbm_len;
 	unsigned long cbm_b;
@@ -836,11 +836,11 @@ bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_domain *d, unsigned long cbm
  *         if it is not possible to test due to memory allocation issue,
  *         false otherwise.
  */
-bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_domain *d)
+bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_ctrl_domain *d)
 {
+	struct rdt_ctrl_domain *d_i;
 	cpumask_var_t cpu_with_psl;
 	struct rdt_resource *r;
-	struct rdt_domain *d_i;
 	bool ret = false;
 
 	/* Walking r->domains, ensure it can't race with cpuhp */
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 17d4610eecf5..eb3bbfa96d5a 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -92,8 +92,8 @@ void rdt_last_cmd_printf(const char *fmt, ...)
 
 void rdt_staged_configs_clear(void)
 {
+	struct rdt_ctrl_domain *dom;
 	struct rdt_resource *r;
-	struct rdt_domain *dom;
 
 	lockdep_assert_held(&rdtgroup_mutex);
 
@@ -1012,7 +1012,7 @@ static int rdt_bit_usage_show(struct kernfs_open_file *of,
 	unsigned long sw_shareable = 0, hw_shareable = 0;
 	unsigned long exclusive = 0, pseudo_locked = 0;
 	struct rdt_resource *r = s->res;
-	struct rdt_domain *dom;
+	struct rdt_ctrl_domain *dom;
 	int i, hwb, swb, excl, psl;
 	enum rdtgrp_mode mode;
 	bool sep = false;
@@ -1243,7 +1243,7 @@ static int rdt_has_sparse_bitmasks_show(struct kernfs_open_file *of,
  *
  * Return: false if CBM does not overlap, true if it does.
  */
-static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d,
+static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_ctrl_domain *d,
 				    unsigned long cbm, int closid,
 				    enum resctrl_conf_type type, bool exclusive)
 {
@@ -1298,7 +1298,7 @@ static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d
  *
  * Return: true if CBM overlap detected, false if there is no overlap
  */
-bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
+bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_ctrl_domain *d,
 			   unsigned long cbm, int closid, bool exclusive)
 {
 	enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
@@ -1329,10 +1329,10 @@ bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_domain *d,
 static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
 {
 	int closid = rdtgrp->closid;
+	struct rdt_ctrl_domain *d;
 	struct resctrl_schema *s;
 	struct rdt_resource *r;
 	bool has_cache = false;
-	struct rdt_domain *d;
 	u32 ctrl;
 
 	/* Walking r->domains, ensure it can't race with cpuhp */
@@ -1448,7 +1448,7 @@ static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
  * bitmap functions work correctly.
  */
 unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
-				  struct rdt_domain *d, unsigned long cbm)
+				  struct rdt_ctrl_domain *d, unsigned long cbm)
 {
 	unsigned int size = 0;
 	struct cacheinfo *ci;
@@ -1476,9 +1476,9 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 {
 	struct resctrl_schema *schema;
 	enum resctrl_conf_type type;
+	struct rdt_ctrl_domain *d;
 	struct rdtgroup *rdtgrp;
 	struct rdt_resource *r;
-	struct rdt_domain *d;
 	unsigned int size;
 	int ret = 0;
 	u32 closid;
@@ -1590,7 +1590,7 @@ static void mon_event_config_read(void *info)
 	mon_info->mon_config = msrval & MAX_EVT_CONFIG_BITS;
 }
 
-static void mondata_config_read(struct rdt_domain *d, struct mon_config_info *mon_info)
+static void mondata_config_read(struct rdt_mon_domain *d, struct mon_config_info *mon_info)
 {
 	smp_call_function_any(&d->hdr.cpu_mask, mon_event_config_read, mon_info, 1);
 }
@@ -1598,7 +1598,7 @@ static void mondata_config_read(struct rdt_domain *d, struct mon_config_info *mo
 static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid)
 {
 	struct mon_config_info mon_info = {0};
-	struct rdt_domain *dom;
+	struct rdt_mon_domain *dom;
 	bool sep = false;
 
 	cpus_read_lock();
@@ -1657,7 +1657,7 @@ static void mon_event_config_write(void *info)
 }
 
 static void mbm_config_write_domain(struct rdt_resource *r,
-				    struct rdt_domain *d, u32 evtid, u32 val)
+				    struct rdt_mon_domain *d, u32 evtid, u32 val)
 {
 	struct mon_config_info mon_info = {0};
 
@@ -1698,7 +1698,7 @@ static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	char *dom_str = NULL, *id_str;
 	unsigned long dom_id, val;
-	struct rdt_domain *d;
+	struct rdt_mon_domain *d;
 
 	/* Walking r->domains, ensure it can't race with cpuhp */
 	lockdep_assert_cpus_held();
@@ -2257,9 +2257,9 @@ static inline bool is_mba_linear(void)
 static int set_cache_qos_cfg(int level, bool enable)
 {
 	void (*update)(void *arg);
+	struct rdt_ctrl_domain *d;
 	struct rdt_resource *r_l;
 	cpumask_var_t cpu_mask;
-	struct rdt_domain *d;
 	int cpu;
 
 	/* Walking r->domains, ensure it can't race with cpuhp */
@@ -2309,7 +2309,7 @@ void rdt_domain_reconfigure_cdp(struct rdt_resource *r)
 		l3_qos_cfg_update(&hw_res->cdp_enabled);
 }
 
-static int mba_sc_domain_allocate(struct rdt_resource *r, struct rdt_domain *d)
+static int mba_sc_domain_allocate(struct rdt_resource *r, struct rdt_ctrl_domain *d)
 {
 	u32 num_closid = resctrl_arch_get_num_closid(r);
 	int cpu = cpumask_any(&d->hdr.cpu_mask);
@@ -2327,7 +2327,7 @@ static int mba_sc_domain_allocate(struct rdt_resource *r, struct rdt_domain *d)
 }
 
 static void mba_sc_domain_destroy(struct rdt_resource *r,
-				  struct rdt_domain *d)
+				  struct rdt_ctrl_domain *d)
 {
 	kfree(d->mbps_val);
 	d->mbps_val = NULL;
@@ -2353,7 +2353,7 @@ static int set_mba_sc(bool mba_sc)
 {
 	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl;
 	u32 num_closid = resctrl_arch_get_num_closid(r);
-	struct rdt_domain *d;
+	struct rdt_ctrl_domain *d;
 	int i;
 
 	if (!supports_mba_mbps() || mba_sc == is_mba_sc(r))
@@ -2625,7 +2625,7 @@ static int rdt_get_tree(struct fs_context *fc)
 {
 	struct rdt_fs_context *ctx = rdt_fc2context(fc);
 	unsigned long flags = RFTYPE_CTRL_BASE;
-	struct rdt_domain *dom;
+	struct rdt_mon_domain *dom;
 	struct rdt_resource *r;
 	int ret;
 
@@ -2810,9 +2810,9 @@ static int rdt_init_fs_context(struct fs_context *fc)
 static int reset_all_ctrls(struct rdt_resource *r)
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-	struct rdt_hw_domain *hw_dom;
+	struct rdt_hw_ctrl_domain *hw_dom;
 	struct msr_param msr_param;
-	struct rdt_domain *d;
+	struct rdt_ctrl_domain *d;
 	int i;
 
 	/* Walking r->domains, ensure it can't race with cpuhp */
@@ -2828,7 +2828,7 @@ static int reset_all_ctrls(struct rdt_resource *r)
 	 * from each domain to update the MSRs below.
 	 */
 	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
-		hw_dom = resctrl_to_arch_dom(d);
+		hw_dom = resctrl_to_arch_ctrl_dom(d);
 
 		for (i = 0; i < hw_res->num_closid; i++)
 			hw_dom->ctrl_val[i] = r->default_ctrl;
@@ -3021,7 +3021,7 @@ static void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
 }
 
 static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
-				struct rdt_domain *d,
+				struct rdt_mon_domain *d,
 				struct rdt_resource *r, struct rdtgroup *prgrp)
 {
 	union mon_data_bits priv;
@@ -3070,7 +3070,7 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
  * and "monitor" groups with given domain id.
  */
 static void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
-					   struct rdt_domain *d)
+					   struct rdt_mon_domain *d)
 {
 	struct kernfs_node *parent_kn;
 	struct rdtgroup *prgrp, *crgrp;
@@ -3092,7 +3092,7 @@ static int mkdir_mondata_subdir_alldom(struct kernfs_node *parent_kn,
 				       struct rdt_resource *r,
 				       struct rdtgroup *prgrp)
 {
-	struct rdt_domain *dom;
+	struct rdt_mon_domain *dom;
 	int ret;
 
 	/* Walking r->domains, ensure it can't race with cpuhp */
@@ -3197,7 +3197,7 @@ static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
  * Set the RDT domain up to start off with all usable allocations. That is,
  * all shareable and unused bits. All-zero CBM is invalid.
  */
-static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
+static int __init_one_rdt_domain(struct rdt_ctrl_domain *d, struct resctrl_schema *s,
 				 u32 closid)
 {
 	enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
@@ -3277,7 +3277,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
  */
 static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
 {
-	struct rdt_domain *d;
+	struct rdt_ctrl_domain *d;
 	int ret;
 
 	list_for_each_entry(d, &s->res->ctrl_domains, hdr.list) {
@@ -3293,7 +3293,7 @@ static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
 static void rdtgroup_init_mba(struct rdt_resource *r, u32 closid)
 {
 	struct resctrl_staged_config *cfg;
-	struct rdt_domain *d;
+	struct rdt_ctrl_domain *d;
 
 	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
 		if (is_mba_sc(r)) {
@@ -3919,14 +3919,14 @@ static void __init rdtgroup_setup_default(void)
 	mutex_unlock(&rdtgroup_mutex);
 }
 
-static void domain_destroy_mon_state(struct rdt_domain *d)
+static void domain_destroy_mon_state(struct rdt_mon_domain *d)
 {
 	bitmap_free(d->rmid_busy_llc);
 	kfree(d->mbm_total);
 	kfree(d->mbm_local);
 }
 
-void resctrl_offline_ctrl_domain(struct rdt_resource *r, struct rdt_domain *d)
+void resctrl_offline_ctrl_domain(struct rdt_resource *r, struct rdt_ctrl_domain *d)
 {
 	mutex_lock(&rdtgroup_mutex);
 
@@ -3936,7 +3936,7 @@ void resctrl_offline_ctrl_domain(struct rdt_resource *r, struct rdt_domain *d)
 	mutex_unlock(&rdtgroup_mutex);
 }
 
-void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_domain *d)
+void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d)
 {
 	mutex_lock(&rdtgroup_mutex);
 
@@ -3967,7 +3967,7 @@ void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_domain *d)
 	mutex_unlock(&rdtgroup_mutex);
 }
 
-static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
+static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_mon_domain *d)
 {
 	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
 	size_t tsize;
@@ -3998,7 +3998,7 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
 	return 0;
 }
 
-int resctrl_online_ctrl_domain(struct rdt_resource *r, struct rdt_domain *d)
+int resctrl_online_ctrl_domain(struct rdt_resource *r, struct rdt_ctrl_domain *d)
 {
 	int err = 0;
 
@@ -4014,7 +4014,7 @@ int resctrl_online_ctrl_domain(struct rdt_resource *r, struct rdt_domain *d)
 	return err;
 }
 
-int resctrl_online_mon_domain(struct rdt_resource *r, struct rdt_domain *d)
+int resctrl_online_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d)
 {
 	int err;
 
@@ -4069,8 +4069,8 @@ static void clear_childcpus(struct rdtgroup *r, unsigned int cpu)
 void resctrl_offline_cpu(unsigned int cpu)
 {
 	struct rdt_resource *l3 = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+	struct rdt_mon_domain *d;
 	struct rdtgroup *rdtgrp;
-	struct rdt_domain *d;
 
 	mutex_lock(&rdtgroup_mutex);
 	list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 96ddf9ff3183..aa2c22a8e37b 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -78,7 +78,23 @@ struct rdt_domain_hdr {
 };
 
 /**
- * struct rdt_domain - group of CPUs sharing a resctrl resource
+ * struct rdt_ctrl_domain - group of CPUs sharing a resctrl control resource
+ * @hdr:		common header for different domain types
+ * @plr:		pseudo-locked region (if any) associated with domain
+ * @staged_config:	parsed configuration to be applied
+ * @mbps_val:		When mba_sc is enabled, this holds the array of user
+ *			specified control values for mba_sc in MBps, indexed
+ *			by closid
+ */
+struct rdt_ctrl_domain {
+	struct rdt_domain_hdr		hdr;
+	struct pseudo_lock_region	*plr;
+	struct resctrl_staged_config	staged_config[CDP_NUM_TYPES];
+	u32				*mbps_val;
+};
+
+/**
+ * struct rdt_mon_domain - group of CPUs sharing a resctrl monitor resource
  * @hdr:		common header for different domain types
  * @rmid_busy_llc:	bitmap of which limbo RMIDs are above threshold
  * @mbm_total:		saved state for MBM total bandwidth
@@ -87,13 +103,8 @@ struct rdt_domain_hdr {
  * @cqm_limbo:		worker to periodically read CQM h/w counters
  * @mbm_work_cpu:	worker CPU for MBM h/w counters
  * @cqm_work_cpu:	worker CPU for CQM h/w counters
- * @plr:		pseudo-locked region (if any) associated with domain
- * @staged_config:	parsed configuration to be applied
- * @mbps_val:		When mba_sc is enabled, this holds the array of user
- *			specified control values for mba_sc in MBps, indexed
- *			by closid
  */
-struct rdt_domain {
+struct rdt_mon_domain {
 	struct rdt_domain_hdr		hdr;
 	unsigned long			*rmid_busy_llc;
 	struct mbm_state		*mbm_total;
@@ -102,9 +113,6 @@ struct rdt_domain {
 	struct delayed_work		cqm_limbo;
 	int				mbm_work_cpu;
 	int				cqm_work_cpu;
-	struct pseudo_lock_region	*plr;
-	struct resctrl_staged_config	staged_config[CDP_NUM_TYPES];
-	u32				*mbps_val;
 };
 
 /**
@@ -208,7 +216,7 @@ struct rdt_resource {
 	const char		*format_str;
 	int			(*parse_ctrlval)(struct rdt_parse_data *data,
 						 struct resctrl_schema *s,
-						 struct rdt_domain *d);
+						 struct rdt_ctrl_domain *d);
 	struct list_head	evt_list;
 	unsigned long		fflags;
 	bool			cdp_capable;
@@ -242,15 +250,15 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid);
  * Update the ctrl_val and apply this config right now.
  * Must be called on one of the domain's CPUs.
  */
-int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
+int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_ctrl_domain *d,
 			    u32 closid, enum resctrl_conf_type t, u32 cfg_val);
 
-u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
+u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_ctrl_domain *d,
 			    u32 closid, enum resctrl_conf_type type);
-int resctrl_online_ctrl_domain(struct rdt_resource *r, struct rdt_domain *d);
-int resctrl_online_mon_domain(struct rdt_resource *r, struct rdt_domain *d);
-void resctrl_offline_ctrl_domain(struct rdt_resource *r, struct rdt_domain *d);
-void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_domain *d);
+int resctrl_online_ctrl_domain(struct rdt_resource *r, struct rdt_ctrl_domain *d);
+int resctrl_online_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d);
+void resctrl_offline_ctrl_domain(struct rdt_resource *r, struct rdt_ctrl_domain *d);
+void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d);
 void resctrl_online_cpu(unsigned int cpu);
 void resctrl_offline_cpu(unsigned int cpu);
 
@@ -279,7 +287,7 @@ void resctrl_offline_cpu(unsigned int cpu);
  * Return:
  * 0 on success, or -EIO, -EINVAL etc on error.
  */
-int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain *d,
+int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_mon_domain *d,
 			   u32 closid, u32 rmid, enum resctrl_event_id eventid,
 			   u64 *val, void *arch_mon_ctx);
 
@@ -312,7 +320,7 @@ static inline void resctrl_arch_rmid_read_context_check(void)
  *
  * This can be called from any CPU.
  */
-void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_domain *d,
+void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_mon_domain *d,
 			     u32 closid, u32 rmid,
 			     enum resctrl_event_id eventid);
 
@@ -325,7 +333,7 @@ void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_domain *d,
  *
  * This can be called from any CPU.
  */
-void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_domain *d);
+void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_mon_domain *d);
 
 extern unsigned int resctrl_rmid_realloc_threshold;
 extern unsigned int resctrl_rmid_realloc_limit;
-- 
Gitee


From 9f75d1cd939215d0d5dbd8e6916911fa88ea3488 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:05 -0700
Subject: [PATCH 174/280] x86/resctrl: Add node-scope to the options for
 feature scope

ANBZ: #31045

commit 1a171608ee8d40d22d604303e42f033c69151123 upstream.

Currently supported resctrl features are all domain scoped the same as the
scope of the L2 or L3 caches.

Add RESCTRL_L3_NODE as a new option for features that are scoped at the
same granularity as NUMA nodes. This is needed for Intel's Sub-NUMA
Cluster (SNC) feature where monitoring features are divided between
nodes that share an L3 cache.

Intel-SIG: commit 1a171608ee8d x86/resctrl: Add node-scope to the options for feature scope.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-6-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c | 2 ++
 include/linux/resctrl.h            | 1 +
 2 files changed, 3 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index cef224de2dea..8d7f68350efc 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -510,6 +510,8 @@ static int get_domain_id_from_scope(int cpu, enum resctrl_scope scope)
 	case RESCTRL_L2_CACHE:
 	case RESCTRL_L3_CACHE:
 		return get_cpu_cacheinfo_id(cpu, scope);
+	case RESCTRL_L3_NODE:
+		return cpu_to_node(cpu);
 	default:
 		break;
 	}
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index aa2c22a8e37b..64b6ad1b22a1 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -176,6 +176,7 @@ struct resctrl_schema;
 enum resctrl_scope {
 	RESCTRL_L2_CACHE = 2,
 	RESCTRL_L3_CACHE = 3,
+	RESCTRL_L3_NODE,
 };
 
 /**
-- 
Gitee


From 36d5552cc4a60a56c3d7f2cbe8f6f4488630887b Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:06 -0700
Subject: [PATCH 175/280] x86/resctrl: Introduce snc_nodes_per_l3_cache

ANBZ: #31045

commit e13db55b5a0d447dea63cde772c1078405bbbf96 upstream.

Intel Sub-NUMA Cluster (SNC) is a feature that subdivides the CPU cores
and memory controllers on a socket into two or more groups. These are
presented to the operating system as NUMA nodes.

This may enable some workloads to have slightly lower latency to memory
as the memory controller(s) in an SNC node are electrically closer to the
CPU cores on that SNC node. This cost may be offset by lower bandwidth
since the memory accesses for each core can only be interleaved between
the memory controllers on the same SNC node.

Resctrl monitoring on an Intel system depends upon attaching RMIDs to tasks
to track L3 cache occupancy and memory bandwidth. There is an MSR that
controls how the RMIDs are shared between SNC nodes.

The default mode divides them numerically. E.g. when there are two SNC
nodes on a socket the lower number half of the RMIDs are given to the
first node, the remainder to the second node. This would be difficult
to use with the Linux resctrl interface as specific RMID values assigned
to resctrl groups are not visible to users.

RMID sharing mode divides the physical RMIDs evenly between SNC nodes
but uses a logical RMID in the IA32_PQR_ASSOC MSR. For example a system
with 200 physical RMIDs (as enumerated by CPUID leaf 0xF) that has two
SNC nodes per L3 cache instance would have 100 logical RMIDs available
for Linux to use. A task running on SNC node 0 with RMID 5 would
accumulate LLC occupancy and MBM bandwidth data in physical RMID 5.
Another task using RMID 5, but running on SNC node 1 would accumulate
data in physical RMID 105.

Even with this renumbering SNC mode requires several changes in resctrl
behavior for correct operation.

Add a static global to arch/x86/kernel/cpu/resctrl/monitor.c to indicate
how many SNC domains share an L3 cache instance.  Initialize this to
"1". Runtime detection of SNC mode will adjust this value.

Update all places to take appropriate action when SNC mode is enabled:
1) The number of logical RMIDs per L3 cache available for use is the
   number of physical RMIDs divided by the number of SNC nodes.
2) Likewise the "mon_scale" value must be divided by the number of SNC
   nodes.
3) Add a function to convert from logical RMID values (assigned to
   tasks and loaded into the IA32_PQR_ASSOC MSR on context switch)
   to physical RMID values to load into IA32_QM_EVTSEL MSR when
   reading counters on each SNC node.

Intel-SIG: commit e13db55b5a0d x86/resctrl: Introduce snc_nodes_per_l3_cache.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-7-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/monitor.c | 56 ++++++++++++++++++++++++---
 1 file changed, 50 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 2f5d35f0716f..b6220089c68c 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -97,6 +97,8 @@ unsigned int resctrl_rmid_realloc_limit;
 
 #define CF(cf)	((unsigned long)(1048576 * (cf) + 0.5))
 
+static int snc_nodes_per_l3_cache = 1;
+
 /*
  * The correction factor table is documented in Documentation/arch/x86/resctrl.rst.
  * If rmid > rmid threshold, MBM total and local values should be multiplied
@@ -185,7 +187,43 @@ static inline struct rmid_entry *__rmid_entry(u32 idx)
 	return entry;
 }
 
-static int __rmid_read(u32 rmid, enum resctrl_event_id eventid, u64 *val)
+/*
+ * When Sub-NUMA Cluster (SNC) mode is not enabled (as indicated by
+ * "snc_nodes_per_l3_cache == 1") no translation of the RMID value is
+ * needed. The physical RMID is the same as the logical RMID.
+ *
+ * On a platform with SNC mode enabled, Linux enables RMID sharing mode
+ * via MSR 0xCA0 (see the "RMID Sharing Mode" section in the "Intel
+ * Resource Director Technology Architecture Specification" for a full
+ * description of RMID sharing mode).
+ *
+ * In RMID sharing mode there are fewer "logical RMID" values available
+ * to accumulate data ("physical RMIDs" are divided evenly between SNC
+ * nodes that share an L3 cache). Linux creates an rdt_mon_domain for
+ * each SNC node.
+ *
+ * The value loaded into IA32_PQR_ASSOC is the "logical RMID".
+ *
+ * Data is collected independently on each SNC node and can be retrieved
+ * using the "physical RMID" value computed by this function and loaded
+ * into IA32_QM_EVTSEL. @cpu can be any CPU in the SNC node.
+ *
+ * The scope of the IA32_QM_EVTSEL and IA32_QM_CTR MSRs is at the L3
+ * cache.  So a "physical RMID" may be read from any CPU that shares
+ * the L3 cache with the desired SNC node, not just from a CPU in
+ * the specific SNC node.
+ */
+static int logical_rmid_to_physical_rmid(int cpu, int lrmid)
+{
+	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+
+	if (snc_nodes_per_l3_cache == 1)
+		return lrmid;
+
+	return lrmid + (cpu_to_node(cpu) % snc_nodes_per_l3_cache) * r->num_rmid;
+}
+
+static int __rmid_read_phys(u32 prmid, enum resctrl_event_id eventid, u64 *val)
 {
 	u64 msr_val;
 
@@ -197,7 +235,7 @@ static int __rmid_read(u32 rmid, enum resctrl_event_id eventid, u64 *val)
 	 * IA32_QM_CTR.Error (bit 63) and IA32_QM_CTR.Unavailable (bit 62)
 	 * are error bits.
 	 */
-	wrmsr(MSR_IA32_QM_EVTSEL, eventid, rmid);
+	wrmsr(MSR_IA32_QM_EVTSEL, eventid, prmid);
 	rdmsrl(MSR_IA32_QM_CTR, msr_val);
 
 	if (msr_val & RMID_VAL_ERROR)
@@ -233,14 +271,17 @@ void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_mon_domain *d,
 			     enum resctrl_event_id eventid)
 {
 	struct rdt_hw_mon_domain *hw_dom = resctrl_to_arch_mon_dom(d);
+	int cpu = cpumask_any(&d->hdr.cpu_mask);
 	struct arch_mbm_state *am;
+	u32 prmid;
 
 	am = get_arch_mbm_state(hw_dom, rmid, eventid);
 	if (am) {
 		memset(am, 0, sizeof(*am));
 
+		prmid = logical_rmid_to_physical_rmid(cpu, rmid);
 		/* Record any initial, non-zero count value. */
-		__rmid_read(rmid, eventid, &am->prev_msr);
+		__rmid_read_phys(prmid, eventid, &am->prev_msr);
 	}
 }
 
@@ -275,8 +316,10 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_mon_domain *d,
 {
 	struct rdt_hw_mon_domain *hw_dom = resctrl_to_arch_mon_dom(d);
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
+	int cpu = cpumask_any(&d->hdr.cpu_mask);
 	struct arch_mbm_state *am;
 	u64 msr_val, chunks;
+	u32 prmid;
 	int ret;
 
 	resctrl_arch_rmid_read_context_check();
@@ -284,7 +327,8 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_mon_domain *d,
 	if (!cpumask_test_cpu(smp_processor_id(), &d->hdr.cpu_mask))
 		return -EINVAL;
 
-	ret = __rmid_read(rmid, eventid, &msr_val);
+	prmid = logical_rmid_to_physical_rmid(cpu, rmid);
+	ret = __rmid_read_phys(prmid, eventid, &msr_val);
 	if (ret)
 		return ret;
 
@@ -1023,8 +1067,8 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 	int ret;
 
 	resctrl_rmid_realloc_limit = boot_cpu_data.x86_cache_size * 1024;
-	hw_res->mon_scale = boot_cpu_data.x86_cache_occ_scale;
-	r->num_rmid = boot_cpu_data.x86_cache_max_rmid + 1;
+	hw_res->mon_scale = boot_cpu_data.x86_cache_occ_scale / snc_nodes_per_l3_cache;
+	r->num_rmid = (boot_cpu_data.x86_cache_max_rmid + 1) / snc_nodes_per_l3_cache;
 	hw_res->mbm_width = MBM_CNTR_WIDTH_BASE;
 
 	if (mbm_offset > 0 && mbm_offset <= MBM_CNTR_WIDTH_OFFSET_MAX)
-- 
Gitee


From 56306f16cf703eaf27c712783a824075daf719aa Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:07 -0700
Subject: [PATCH 176/280] x86/resctrl: Block use of mba_MBps mount option on
 Sub-NUMA Cluster (SNC) systems

ANBZ: #31045

commit ac20aa423052553c005089b00f1e3caf79d3c1d3 upstream.

When SNC is enabled there is a mismatch between the MBA control function
which operates at L3 cache scope and the MBM monitor functions which
measure memory bandwidth on each SNC node.

Block use of the mba_MBps when scopes for MBA/MBM do not match.

Improve user diagnostics by adding invalfc() message when mba_MBps
is not supported.

Intel-SIG: commit ac20aa423052 x86/resctrl: Block use of mba_MBps mount option on Sub-NUMA Cluster (SNC) systems.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-8-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index eb3bbfa96d5a..d3b0fa958266 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2335,14 +2335,18 @@ static void mba_sc_domain_destroy(struct rdt_resource *r,
 
 /*
  * MBA software controller is supported only if
- * MBM is supported and MBA is in linear scale.
+ * MBM is supported and MBA is in linear scale,
+ * and the MBM monitor scope is the same as MBA
+ * control scope.
  */
 static bool supports_mba_mbps(void)
 {
+	struct rdt_resource *rmbm = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
 	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl;
 
 	return (is_mbm_local_enabled() &&
-		r->alloc_capable && is_mba_linear());
+		r->alloc_capable && is_mba_linear() &&
+		r->ctrl_scope == rmbm->mon_scope);
 }
 
 /*
@@ -2750,6 +2754,7 @@ static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
 {
 	struct rdt_fs_context *ctx = rdt_fc2context(fc);
 	struct fs_parse_result result;
+	const char *msg;
 	int opt;
 
 	opt = fs_parse(fc, rdt_fs_parameters, param, &result);
@@ -2764,8 +2769,9 @@ static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
 		ctx->enable_cdpl2 = true;
 		return 0;
 	case Opt_mba_mbps:
+		msg = "mba_MBps requires local MBM and linear scale MBA at L3 scope";
 		if (!supports_mba_mbps())
-			return -EINVAL;
+			return invalfc(fc, msg);
 		ctx->enable_mba_mbps = true;
 		return 0;
 	case Opt_debug:
-- 
Gitee


From 10e89d3517075098317cb97a9526835b5c0730ee Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:08 -0700
Subject: [PATCH 177/280] x86/resctrl: Prepare for new Sub-NUMA Cluster (SNC)
 monitor files
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

ANBZ: #31045

commit 328ea688746420e12ced6cfbc5064413180244cc upstream.

When SNC is enabled, monitoring data is collected at the SNC node granularity,
but must be reported at L3-cache granularity for backwards compatibility in
addition to reporting at the node level.

Add a "ci" field to the rdt_mon_domain structure to save the cache information
about the enclosing L3 cache for the domain.  This provides:

1) The cache id which is needed to compose the name of the legacy monitoring
   directory, and to determine which domains should be summed to provide
   L3-scoped data.

2) The shared_cpu_map which is needed to determine which CPUs can be used to
   read the RMID counters with the MSR interface.

This is the first step to an eventual goal of monitor reporting files like this
(for a system with two SNC nodes per L3):

  $ cd /sys/fs/resctrl/mon_data
  $ tree mon_L3_00
  mon_L3_00			<- 00 here is L3 cache id
  ├── llc_occupancy		\  These files provide legacy support
  ├── mbm_local_bytes		 > for non-SNC aware monitor apps
  ├── mbm_total_bytes		/  that expect data at L3 cache level
  ├── mon_sub_L3_00		<- 00 here is SNC node id
  │   ├── llc_occupancy		\  These files are finer grained
  │   ├── mbm_local_bytes		 > data from each SNC node
  │   └── mbm_total_bytes		/
  └── mon_sub_L3_01
      ├── llc_occupancy		\
      ├── mbm_local_bytes		 > As above, but for node 1.
      └── mbm_total_bytes		/

  [ bp: Massage commit message. ]

Intel-SIG: commit 328ea6887464 x86/resctrl: Prepare for new Sub-NUMA Cluster (SNC) monitor files.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-9-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        | 7 ++++++-
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 1 -
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 1 -
 include/linux/resctrl.h                   | 3 +++
 4 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 8d7f68350efc..1ea66af7cf0c 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -19,7 +19,6 @@
 #include <linux/cpu.h>
 #include <linux/slab.h>
 #include <linux/err.h>
-#include <linux/cacheinfo.h>
 #include <linux/cpuhotplug.h>
 
 #include <asm/cpu_device_id.h>
@@ -608,6 +607,12 @@ static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
 	d = &hw_dom->d_resctrl;
 	d->hdr.id = id;
 	d->hdr.type = RESCTRL_MON_DOMAIN;
+	d->ci = get_cpu_cacheinfo_level(cpu, RESCTRL_L3_CACHE);
+	if (!d->ci) {
+		pr_warn_once("Can't find L3 cache for CPU:%d resource %s\n", cpu, r->name);
+		mon_domain_free(hw_dom);
+		return;
+	}
 	cpumask_set_cpu(cpu, &d->hdr.cpu_mask);
 
 	if (arch_domain_mbm_alloc(r->num_rmid, hw_dom)) {
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 70f0069b87d8..e69489d48625 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -11,7 +11,6 @@
 
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
 
-#include <linux/cacheinfo.h>
 #include <linux/cpu.h>
 #include <linux/cpumask.h>
 #include <linux/debugfs.h>
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index d3b0fa958266..70d41a8fd788 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -12,7 +12,6 @@
 
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
 
-#include <linux/cacheinfo.h>
 #include <linux/cpu.h>
 #include <linux/debugfs.h>
 #include <linux/fs.h>
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 64b6ad1b22a1..b0875b99e811 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -2,6 +2,7 @@
 #ifndef _RESCTRL_H
 #define _RESCTRL_H
 
+#include <linux/cacheinfo.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/pid.h>
@@ -96,6 +97,7 @@ struct rdt_ctrl_domain {
 /**
  * struct rdt_mon_domain - group of CPUs sharing a resctrl monitor resource
  * @hdr:		common header for different domain types
+ * @ci:			cache info for this domain
  * @rmid_busy_llc:	bitmap of which limbo RMIDs are above threshold
  * @mbm_total:		saved state for MBM total bandwidth
  * @mbm_local:		saved state for MBM local bandwidth
@@ -106,6 +108,7 @@ struct rdt_ctrl_domain {
  */
 struct rdt_mon_domain {
 	struct rdt_domain_hdr		hdr;
+	struct cacheinfo		*ci;
 	unsigned long			*rmid_busy_llc;
 	struct mbm_state		*mbm_total;
 	struct mbm_state		*mbm_local;
-- 
Gitee


From 0922db26e5fbb1414ca6cefa31e508e7703fa270 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:09 -0700
Subject: [PATCH 178/280] x86/resctrl: Add a new field to struct rmid_read for
 summation of domains

ANBZ: #31045

commit fb1f51f677585f1b1ba17d2390963bbebe7a8cfa upstream.

When a user reads a monitor file rdtgroup_mondata_show() calls mon_event_read()
to package up all the required details into an rmid_read structure which is
passed across the smp_call*() infrastructure to code that will read data from
hardware and return the value (or error status) in the rmid_read structure.

Sub-NUMA Cluster (SNC) mode adds files with new semantics. These require the
smp_call-ed code to sum event data from all domains that share an L3 cache.

Add a pointer to the L3 "cacheinfo" structure to struct rmid_read for the data
collection routines to use to pick the domains to be summed.

  [ Reinette: the rmid_read structure has become complex enough so document each
    of its fields and provide the kerneldoc documentation for struct rmid_read. ]

Intel-SIG: commit fb1f51f67758 x86/resctrl: Add a new field to struct rmid_read for summation of domains.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Co-developed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-10-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 135190e0711c..681b5bdcd2f9 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -144,12 +144,31 @@ union mon_data_bits {
 	} u;
 };
 
+/**
+ * struct rmid_read - Data passed across smp_call*() to read event count.
+ * @rgrp:  Resource group for which the counter is being read. If it is a parent
+ *	   resource group then its event count is summed with the count from all
+ *	   its child resource groups.
+ * @r:	   Resource describing the properties of the event being read.
+ * @d:	   Domain that the counter should be read from. If NULL then sum all
+ *	   domains in @r sharing L3 @ci.id
+ * @evtid: Which monitor event to read.
+ * @first: Initialize MBM counter when true.
+ * @ci:    Cacheinfo for L3. Only set when @d is NULL. Used when summing domains.
+ * @err:   Error encountered when reading counter.
+ * @val:   Returned value of event counter. If @rgrp is a parent resource group,
+ *	   @val includes the sum of event counts from its child resource groups.
+ *	   If @d is NULL, @val includes the sum of all domains in @r sharing @ci.id,
+ *	   (summed across child resource groups if @rgrp is a parent resource group).
+ * @arch_mon_ctx: Hardware monitor allocated for this read request (MPAM only).
+ */
 struct rmid_read {
 	struct rdtgroup		*rgrp;
 	struct rdt_resource	*r;
 	struct rdt_mon_domain	*d;
 	enum resctrl_event_id	evtid;
 	bool			first;
+	struct cacheinfo	*ci;
 	int			err;
 	u64			val;
 	void			*arch_mon_ctx;
-- 
Gitee


From 3184f56206ec927d89527201975d4a6e3909525a Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:10 -0700
Subject: [PATCH 179/280] x86/resctrl: Initialize on-stack struct rmid_read
 instances

ANBZ: #31045

commit 587edd7069b9e7dc7993d2df9371e7c37a4d2133 upstream.

New semantics rely on some struct rmid_read members having NULL values to
distinguish between the SNC and non-SNC scenarios.  resctrl can thus no longer
rely on this struct not being initialized properly.

Initialize all on-stack declarations of struct rmid_read:

  rdtgroup_mondata_show()
  mbm_update()
  mkdir_mondata_subdir()

to ensure that garbage values from the stack are not passed down to other
functions.

  [ bp: Massage commit message. ]

Intel-SIG: commit 587edd7069b9 x86/resctrl: Initialize on-stack struct rmid_read instances.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-11-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 3 +--
 arch/x86/kernel/cpu/resctrl/monitor.c     | 3 +--
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 2 +-
 3 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 97e554e36f07..7b670ee6fd9d 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -534,7 +534,6 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 	rr->evtid = evtid;
 	rr->r = r;
 	rr->d = d;
-	rr->val = 0;
 	rr->first = first;
 	rr->arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, evtid);
 	if (IS_ERR(rr->arch_mon_ctx)) {
@@ -562,12 +561,12 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 {
 	struct kernfs_open_file *of = m->private;
 	struct rdt_domain_hdr *hdr;
+	struct rmid_read rr = {0};
 	struct rdt_mon_domain *d;
 	u32 resid, evtid, domid;
 	struct rdtgroup *rdtgrp;
 	struct rdt_resource *r;
 	union mon_data_bits md;
-	struct rmid_read rr;
 	int ret = 0;
 
 	rdtgrp = rdtgroup_kn_lock_live(of->kn);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index b6220089c68c..9bba9d59d5f6 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -781,9 +781,8 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_mon_domain *dom_mbm)
 static void mbm_update(struct rdt_resource *r, struct rdt_mon_domain *d,
 		       u32 closid, u32 rmid)
 {
-	struct rmid_read rr;
+	struct rmid_read rr = {0};
 
-	rr.first = false;
 	rr.r = r;
 	rr.d = d;
 
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 70d41a8fd788..d0443589cd86 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -3029,10 +3029,10 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
 				struct rdt_mon_domain *d,
 				struct rdt_resource *r, struct rdtgroup *prgrp)
 {
+	struct rmid_read rr = {0};
 	union mon_data_bits priv;
 	struct kernfs_node *kn;
 	struct mon_evt *mevt;
-	struct rmid_read rr;
 	char name[32];
 	int ret;
 
-- 
Gitee


From d79d2db57d0c5a8ad06334c59fb178b4e9933910 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:11 -0700
Subject: [PATCH 180/280] x86/resctrl: Refactor mkdir_mondata_subdir() with a
 helper function

ANBZ: #31045

commit 603cf1e28838a01e4f140c3054ce147f8b087d08 upstream.

In Sub-NUMA Cluster (SNC) mode Linux must create the monitor
files in the original "mon_L3_XX" directories and also in each
of the "mon_sub_L3_YY" directories.

Refactor mkdir_mondata_subdir() to move the creation of monitoring files
into a helper function to avoid the need to duplicate code later.

No functional change.

Intel-SIG: commit 603cf1e28838 x86/resctrl: Refactor mkdir_mondata_subdir() with a helper function.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-12-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 45 ++++++++++++++++----------
 1 file changed, 28 insertions(+), 17 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index d0443589cd86..9c38ddcfe150 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -3025,14 +3025,37 @@ static void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
 	}
 }
 
+static int mon_add_all_files(struct kernfs_node *kn, struct rdt_mon_domain *d,
+			     struct rdt_resource *r, struct rdtgroup *prgrp)
+{
+	struct rmid_read rr = {0};
+	union mon_data_bits priv;
+	struct mon_evt *mevt;
+	int ret;
+
+	if (WARN_ON(list_empty(&r->evt_list)))
+		return -EPERM;
+
+	priv.u.rid = r->rid;
+	priv.u.domid = d->hdr.id;
+	list_for_each_entry(mevt, &r->evt_list, list) {
+		priv.u.evtid = mevt->evtid;
+		ret = mon_addfile(kn, mevt->name, priv.priv);
+		if (ret)
+			return ret;
+
+		if (is_mbm_event(mevt->evtid))
+			mon_event_read(&rr, r, d, prgrp, mevt->evtid, true);
+	}
+
+	return 0;
+}
+
 static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
 				struct rdt_mon_domain *d,
 				struct rdt_resource *r, struct rdtgroup *prgrp)
 {
-	struct rmid_read rr = {0};
-	union mon_data_bits priv;
 	struct kernfs_node *kn;
-	struct mon_evt *mevt;
 	char name[32];
 	int ret;
 
@@ -3046,22 +3069,10 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
 	if (ret)
 		goto out_destroy;
 
-	if (WARN_ON(list_empty(&r->evt_list))) {
-		ret = -EPERM;
+	ret = mon_add_all_files(kn, d, r, prgrp);
+	if (ret)
 		goto out_destroy;
-	}
 
-	priv.u.rid = r->rid;
-	priv.u.domid = d->hdr.id;
-	list_for_each_entry(mevt, &r->evt_list, list) {
-		priv.u.evtid = mevt->evtid;
-		ret = mon_addfile(kn, mevt->name, priv.priv);
-		if (ret)
-			goto out_destroy;
-
-		if (is_mbm_event(mevt->evtid))
-			mon_event_read(&rr, r, d, prgrp, mevt->evtid, true);
-	}
 	kernfs_activate(kn);
 	return 0;
 
-- 
Gitee


From ca7076da03e31a94130230a455e6f3abc83ff5c1 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:12 -0700
Subject: [PATCH 181/280] x86/resctrl: Allocate a new field in union
 mon_data_bits

ANBZ: #31045

commit 92b5d0b1189ea9e9f00ae493fc99102fe7f2442f upstream.

When Sub-NUMA Cluster (SNC) mode is enabled, the legacy monitor reporting files
must report the sum of the data from all of the SNC nodes that share the L3
cache that is referenced by the monitor file.

Resctrl squeezes all the attributes of these files into 32 bits so they can be
stored in the "priv" field of struct kernfs_node.

Currently, only three monitor events are defined by enum resctrl_event_id so
reducing it from 8 bits to 7 bits still provides more than enough space to
represent all the known event types.

But note that this choice was arbitrary.  The "rid" field is also far wider
than needed for the current number of resource id types.  This structure is
purely internal to resctrl, no ABI issues with modifying it. Subsequent changes
may rearrange the allocation of bits between each of the fields as needed.

Give the bit to a new "sum" field that indicates that reading this file must
sum across SNC nodes. This bit also indicates that the domid field is the id of
an L3 cache (instead of a domain id) to find which domains must be summed.

Fix up other issues in the kerneldoc description for mon_data_bits.

Intel-SIG: commit 92b5d0b1189e x86/resctrl: Allocate a new field in union mon_data_bits.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-13-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 681b5bdcd2f9..13d862221f9c 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -127,19 +127,25 @@ struct mon_evt {
 };
 
 /**
- * union mon_data_bits - Monitoring details for each event file
+ * union mon_data_bits - Monitoring details for each event file.
  * @priv:              Used to store monitoring event data in @u
- *                     as kernfs private data
- * @rid:               Resource id associated with the event file
- * @evtid:             Event id associated with the event file
- * @domid:             The domain to which the event file belongs
- * @u:                 Name of the bit fields struct
+ *                     as kernfs private data.
+ * @u.rid:             Resource id associated with the event file.
+ * @u.evtid:           Event id associated with the event file.
+ * @u.sum:             Set when event must be summed across multiple
+ *                     domains.
+ * @u.domid:           When @u.sum is zero this is the domain to which
+ *                     the event file belongs. When @sum is one this
+ *                     is the id of the L3 cache that all domains to be
+ *                     summed share.
+ * @u:                 Name of the bit fields struct.
  */
 union mon_data_bits {
 	void *priv;
 	struct {
 		unsigned int rid		: 10;
-		enum resctrl_event_id evtid	: 8;
+		enum resctrl_event_id evtid	: 7;
+		unsigned int sum		: 1;
 		unsigned int domid		: 14;
 	} u;
 };
-- 
Gitee


From bc69a245f276e5dc6eec4ec59da1ca4cf09687e4 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:13 -0700
Subject: [PATCH 182/280] x86/resctrl: Create Sub-NUMA Cluster (SNC) monitor
 files

ANBZ: #31045

commit 0158ed6a1335ff37f0336a986d7b99d6e97d46e9 upstream.

When SNC mode is enabled, create subdirectories and files to monitor at the SNC
node granularity. Legacy behavior is preserved by tagging the monitor files at
the L3 granularity with the "sum" attribute.  When the user reads these files
the kernel will read monitor data from all SNC nodes that share the same L3
cache instance and return the aggregated value to the user.

Note that the "domid" field for files that must sum across SNC domains has the
L3 cache instance id, while non-summing files use the domain id.

The "sum" files do not need to make a call to mon_event_read() to initialize
the MBM counters. This will be handled by initializing the individual SNC nodes
that share the L3.

Intel-SIG: commit 0158ed6a1335 x86/resctrl: Create Sub-NUMA Cluster (SNC) monitor files.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-14-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 62 +++++++++++++++++++-------
 1 file changed, 46 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 9c38ddcfe150..8502385e389f 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -3026,7 +3026,8 @@ static void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
 }
 
 static int mon_add_all_files(struct kernfs_node *kn, struct rdt_mon_domain *d,
-			     struct rdt_resource *r, struct rdtgroup *prgrp)
+			     struct rdt_resource *r, struct rdtgroup *prgrp,
+			     bool do_sum)
 {
 	struct rmid_read rr = {0};
 	union mon_data_bits priv;
@@ -3037,14 +3038,15 @@ static int mon_add_all_files(struct kernfs_node *kn, struct rdt_mon_domain *d,
 		return -EPERM;
 
 	priv.u.rid = r->rid;
-	priv.u.domid = d->hdr.id;
+	priv.u.domid = do_sum ? d->ci->id : d->hdr.id;
+	priv.u.sum = do_sum;
 	list_for_each_entry(mevt, &r->evt_list, list) {
 		priv.u.evtid = mevt->evtid;
 		ret = mon_addfile(kn, mevt->name, priv.priv);
 		if (ret)
 			return ret;
 
-		if (is_mbm_event(mevt->evtid))
+		if (!do_sum && is_mbm_event(mevt->evtid))
 			mon_event_read(&rr, r, d, prgrp, mevt->evtid, true);
 	}
 
@@ -3055,23 +3057,51 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
 				struct rdt_mon_domain *d,
 				struct rdt_resource *r, struct rdtgroup *prgrp)
 {
-	struct kernfs_node *kn;
+	struct kernfs_node *kn, *ckn;
 	char name[32];
-	int ret;
+	bool snc_mode;
+	int ret = 0;
 
-	sprintf(name, "mon_%s_%02d", r->name, d->hdr.id);
-	/* create the directory */
-	kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp);
-	if (IS_ERR(kn))
-		return PTR_ERR(kn);
+	lockdep_assert_held(&rdtgroup_mutex);
 
-	ret = rdtgroup_kn_set_ugid(kn);
-	if (ret)
-		goto out_destroy;
+	snc_mode = r->mon_scope == RESCTRL_L3_NODE;
+	sprintf(name, "mon_%s_%02d", r->name, snc_mode ? d->ci->id : d->hdr.id);
+	kn = kernfs_find_and_get(parent_kn, name);
+	if (kn) {
+		/*
+		 * rdtgroup_mutex will prevent this directory from being
+		 * removed. No need to keep this hold.
+		 */
+		kernfs_put(kn);
+	} else {
+		kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp);
+		if (IS_ERR(kn))
+			return PTR_ERR(kn);
 
-	ret = mon_add_all_files(kn, d, r, prgrp);
-	if (ret)
-		goto out_destroy;
+		ret = rdtgroup_kn_set_ugid(kn);
+		if (ret)
+			goto out_destroy;
+		ret = mon_add_all_files(kn, d, r, prgrp, snc_mode);
+		if (ret)
+			goto out_destroy;
+	}
+
+	if (snc_mode) {
+		sprintf(name, "mon_sub_%s_%02d", r->name, d->hdr.id);
+		ckn = kernfs_create_dir(kn, name, parent_kn->mode, prgrp);
+		if (IS_ERR(ckn)) {
+			ret = -EINVAL;
+			goto out_destroy;
+		}
+
+		ret = rdtgroup_kn_set_ugid(ckn);
+		if (ret)
+			goto out_destroy;
+
+		ret = mon_add_all_files(ckn, d, r, prgrp, false);
+		if (ret)
+			goto out_destroy;
+	}
 
 	kernfs_activate(kn);
 	return 0;
-- 
Gitee


From 5e10ce48d9b288c46aed5431214e530f3f784a53 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Tue, 2 Jul 2024 10:38:19 -0700
Subject: [PATCH 183/280] x86/resctrl: Handle removing directories in Sub-NUMA
 Cluster (SNC) mode

ANBZ: #31045

commit 6b48b80b08e6f08eea8eaf7e44555ada191b6bee upstream.

In SNC mode, there are multiple subdirectories in each L3 level monitor
directory (one for each SNC node). If all the CPUs in an SNC node are taken
offline, just remove the SNC directory for that node. In non-SNC mode, or when
the last SNC node directory is removed, remove the L3 monitor directory.

Add a helper function to avoid duplicated code.

Intel-SIG: commit 6b48b80b08e6 x86/resctrl: Handle removing directories in Sub-NUMA Cluster (SNC) mode.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20240702173820.90368-2-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 35 +++++++++++++++++++++-----
 1 file changed, 29 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 8502385e389f..58e53f1f52a0 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -3006,22 +3006,45 @@ static int mon_addfile(struct kernfs_node *parent_kn, const char *name,
 	return ret;
 }
 
+static void mon_rmdir_one_subdir(struct kernfs_node *pkn, char *name, char *subname)
+{
+	struct kernfs_node *kn;
+
+	kn = kernfs_find_and_get(pkn, name);
+	if (!kn)
+		return;
+	kernfs_put(kn);
+
+	if (kn->dir.subdirs <= 1)
+		kernfs_remove(kn);
+	else
+		kernfs_remove_by_name(kn, subname);
+}
+
 /*
  * Remove all subdirectories of mon_data of ctrl_mon groups
- * and monitor groups with given domain id.
+ * and monitor groups for the given domain.
+ * Remove files and directories containing "sum" of domain data
+ * when last domain being summed is removed.
  */
 static void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
-					   unsigned int dom_id)
+					   struct rdt_mon_domain *d)
 {
 	struct rdtgroup *prgrp, *crgrp;
+	char subname[32];
+	bool snc_mode;
 	char name[32];
 
+	snc_mode = r->mon_scope == RESCTRL_L3_NODE;
+	sprintf(name, "mon_%s_%02d", r->name, snc_mode ? d->ci->id : d->hdr.id);
+	if (snc_mode)
+		sprintf(subname, "mon_sub_%s_%02d", r->name, d->hdr.id);
+
 	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
-		sprintf(name, "mon_%s_%02d", r->name, dom_id);
-		kernfs_remove_by_name(prgrp->mon.mon_data_kn, name);
+		mon_rmdir_one_subdir(prgrp->mon.mon_data_kn, name, subname);
 
 		list_for_each_entry(crgrp, &prgrp->mon.crdtgrp_list, mon.crdtgrp_list)
-			kernfs_remove_by_name(crgrp->mon.mon_data_kn, name);
+			mon_rmdir_one_subdir(crgrp->mon.mon_data_kn, name, subname);
 	}
 }
 
@@ -3991,7 +4014,7 @@ void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d
 	 * per domain monitor data directories.
 	 */
 	if (resctrl_mounted && resctrl_arch_mon_capable())
-		rmdir_mondata_subdir_allrdtgrp(r, d->hdr.id);
+		rmdir_mondata_subdir_allrdtgrp(r, d);
 
 	if (is_mbm_enabled())
 		cancel_delayed_work(&d->mbm_over);
-- 
Gitee


From dd6bfc3a062d4c38569206f6464312cdc97a4331 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:15 -0700
Subject: [PATCH 184/280] x86/resctrl: Fill out rmid_read structure for
 smp_call*() to read a counter

ANBZ: #31045

commit c8c7d3d904b76c45fe2b5dc982fb5090d12a63af upstream.

mon_event_read() fills out most fields of the struct rmid_read that is passed
via an smp_call*() function to a CPU that is part of the correct domain to
read the monitor counters.

With Sub-NUMA Cluster (SNC) mode there are now two cases to handle:

1) Reading a file that returns a value for a single domain.
   + Choose the CPU to execute from the domain cpu_mask

2) Reading a file that must sum across domains sharing an L3 cache
   instance.
   + Indicate to called code that a sum is needed by passing a NULL
     rdt_mon_domain pointer.
   + Choose the CPU from the L3 shared_cpu_map.

Intel-SIG: commit c8c7d3d904b7 x86/resctrl: Fill out rmid_read structure for smp_call*() to read a counter.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-16-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 40 ++++++++++++++++++-----
 arch/x86/kernel/cpu/resctrl/internal.h    |  2 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    |  2 +-
 3 files changed, 34 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 7b670ee6fd9d..200d89a64027 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -520,7 +520,7 @@ static int smp_mon_event_count(void *arg)
 
 void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 		    struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
-		    int evtid, int first)
+		    cpumask_t *cpumask, int evtid, int first)
 {
 	int cpu;
 
@@ -541,7 +541,7 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 		return;
 	}
 
-	cpu = cpumask_any_housekeeping(&d->hdr.cpu_mask, RESCTRL_PICK_ANY_CPU);
+	cpu = cpumask_any_housekeeping(cpumask, RESCTRL_PICK_ANY_CPU);
 
 	/*
 	 * cpumask_any_housekeeping() prefers housekeeping CPUs, but
@@ -550,7 +550,7 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 	 * counters on some platforms if its called in IRQ context.
 	 */
 	if (tick_nohz_full_cpu(cpu))
-		smp_call_function_any(&d->hdr.cpu_mask, mon_event_count, rr, 1);
+		smp_call_function_any(cpumask, mon_event_count, rr, 1);
 	else
 		smp_call_on_cpu(cpu, smp_mon_event_count, rr, false);
 
@@ -579,16 +579,40 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 	resid = md.u.rid;
 	domid = md.u.domid;
 	evtid = md.u.evtid;
-
 	r = &rdt_resources_all[resid].r_resctrl;
-	hdr = rdt_find_domain(&r->mon_domains, domid, NULL);
-	if (!hdr || WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN)) {
+
+	if (md.u.sum) {
+		/*
+		 * This file requires summing across all domains that share
+		 * the L3 cache id that was provided in the "domid" field of the
+		 * mon_data_bits union. Search all domains in the resource for
+		 * one that matches this cache id.
+		 */
+		list_for_each_entry(d, &r->mon_domains, hdr.list) {
+			if (d->ci->id == domid) {
+				rr.ci = d->ci;
+				mon_event_read(&rr, r, NULL, rdtgrp,
+					       &d->ci->shared_cpu_map, evtid, false);
+				goto checkresult;
+			}
+		}
 		ret = -ENOENT;
 		goto out;
+	} else {
+		/*
+		 * This file provides data from a single domain. Search
+		 * the resource to find the domain with "domid".
+		 */
+		hdr = rdt_find_domain(&r->mon_domains, domid, NULL);
+		if (!hdr || WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN)) {
+			ret = -ENOENT;
+			goto out;
+		}
+		d = container_of(hdr, struct rdt_mon_domain, hdr);
+		mon_event_read(&rr, r, d, rdtgrp, &d->hdr.cpu_mask, evtid, false);
 	}
-	d = container_of(hdr, struct rdt_mon_domain, hdr);
 
-	mon_event_read(&rr, r, d, rdtgrp, evtid, false);
+checkresult:
 
 	if (rr.err == -EIO)
 		seq_puts(m, "Error\n");
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 13d862221f9c..16982d1baf99 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -632,7 +632,7 @@ void mon_event_count(void *info);
 int rdtgroup_mondata_show(struct seq_file *m, void *arg);
 void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 		    struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
-		    int evtid, int first);
+		    cpumask_t *cpumask, int evtid, int first);
 void mbm_setup_overflow_handler(struct rdt_mon_domain *dom,
 				unsigned long delay_ms,
 				int exclude_cpu);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 58e53f1f52a0..d7163b764c62 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -3070,7 +3070,7 @@ static int mon_add_all_files(struct kernfs_node *kn, struct rdt_mon_domain *d,
 			return ret;
 
 		if (!do_sum && is_mbm_event(mevt->evtid))
-			mon_event_read(&rr, r, d, prgrp, mevt->evtid, true);
+			mon_event_read(&rr, r, d, prgrp, &d->hdr.cpu_mask, mevt->evtid, true);
 	}
 
 	return 0;
-- 
Gitee


From cf524af2d875475b0b815539aa3265c6245b8386 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:16 -0700
Subject: [PATCH 185/280] x86/resctrl: Make __mon_event_count() handle sum
 domains

ANBZ: #31045

commit 9fbb303ec949a376f3cbdf6a2b66ad2212c24ebc upstream.

Legacy resctrl monitor files must provide the sum of event values across
all Sub-NUMA Cluster (SNC) domains that share an L3 cache instance.

There are now two cases:
1) A specific domain is provided in struct rmid_read
   This is either a non-SNC system, or the request is to read data
   from just one SNC node.
2) Domain pointer is NULL. In this case the cacheinfo field in struct
   rmid_read indicates that all SNC nodes that share that L3 cache
   instance should have the event read and return the sum of all
   values.

Update the CPU sanity check. The existing check that an event is read
from a CPU in the requested domain still applies when reading a single
domain. But when summing across domains a more relaxed check that the
current CPU is in the scope of the L3 cache instance is appropriate
since the MSRs to read events are scoped at L3 cache level.

Intel-SIG: commit 9fbb303ec949 x86/resctrl: Make __mon_event_count() handle sum domains.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-17-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/monitor.c | 51 ++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 9bba9d59d5f6..7ee4e0c90159 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -324,9 +324,6 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_mon_domain *d,
 
 	resctrl_arch_rmid_read_context_check();
 
-	if (!cpumask_test_cpu(smp_processor_id(), &d->hdr.cpu_mask))
-		return -EINVAL;
-
 	prmid = logical_rmid_to_physical_rmid(cpu, rmid);
 	ret = __rmid_read_phys(prmid, eventid, &msr_val);
 	if (ret)
@@ -593,7 +590,10 @@ static struct mbm_state *get_mbm_state(struct rdt_mon_domain *d, u32 closid,
 
 static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
 {
+	int cpu = smp_processor_id();
+	struct rdt_mon_domain *d;
 	struct mbm_state *m;
+	int err, ret;
 	u64 tval = 0;
 
 	if (rr->first) {
@@ -604,14 +604,47 @@ static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
 		return 0;
 	}
 
-	rr->err = resctrl_arch_rmid_read(rr->r, rr->d, closid, rmid, rr->evtid,
-					 &tval, rr->arch_mon_ctx);
-	if (rr->err)
-		return rr->err;
+	if (rr->d) {
+		/* Reading a single domain, must be on a CPU in that domain. */
+		if (!cpumask_test_cpu(cpu, &rr->d->hdr.cpu_mask))
+			return -EINVAL;
+		rr->err = resctrl_arch_rmid_read(rr->r, rr->d, closid, rmid,
+						 rr->evtid, &tval, rr->arch_mon_ctx);
+		if (rr->err)
+			return rr->err;
 
-	rr->val += tval;
+		rr->val += tval;
 
-	return 0;
+		return 0;
+	}
+
+	/* Summing domains that share a cache, must be on a CPU for that cache. */
+	if (!cpumask_test_cpu(cpu, &rr->ci->shared_cpu_map))
+		return -EINVAL;
+
+	/*
+	 * Legacy files must report the sum of an event across all
+	 * domains that share the same L3 cache instance.
+	 * Report success if a read from any domain succeeds, -EINVAL
+	 * (translated to "Unavailable" for user space) if reading from
+	 * all domains fail for any reason.
+	 */
+	ret = -EINVAL;
+	list_for_each_entry(d, &rr->r->mon_domains, hdr.list) {
+		if (d->ci->id != rr->ci->id)
+			continue;
+		err = resctrl_arch_rmid_read(rr->r, d, closid, rmid,
+					     rr->evtid, &tval, rr->arch_mon_ctx);
+		if (!err) {
+			rr->val += tval;
+			ret = 0;
+		}
+	}
+
+	if (ret)
+		rr->err = ret;
+
+	return ret;
 }
 
 /*
-- 
Gitee


From efc60d7b7fb1219b95aecd6b3eee2dce69eec7fe Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Tue, 2 Jul 2024 10:38:20 -0700
Subject: [PATCH 186/280] x86/resctrl: Enable shared RMID mode on Sub-NUMA
 Cluster (SNC) systems

ANBZ: #31045

commit 21b362cc762aabb3e8496d33d7b4538154c95a0b upstream.

Hardware has two RMID configuration options for SNC systems. The default
mode divides RMID counters between SNC nodes. E.g. with 200 RMIDs and
two SNC nodes per L3 cache RMIDs 0..99 are used on node 0, and 100..199
on node 1. This isn't compatible with Linux resctrl usage. On this
example system a process using RMID 5 would only update monitor counters
while running on SNC node 0.

The other mode is "RMID Sharing Mode". This is enabled by clearing bit
0 of the RMID_SNC_CONFIG (0xCA0) model specific register. In this mode
the number of logical RMIDs is the number of physical RMIDs (from CPUID
leaf 0xF) divided by the number of SNC nodes per L3 cache instance. A
process can use the same RMID across different SNC nodes.

See the "Intel Resource Director Technology Architecture Specification"
for additional details.

When SNC is enabled, update the MSR when a monitor domain is marked
online. Technically this is overkill. It only needs to be done once
per L3 cache instance rather than per SNC domain. But there is no harm
in doing it more than once, and this is not in a critical path.

Intel-SIG: commit 21b362cc762a x86/resctrl: Enable shared RMID mode on Sub-NUMA Cluster (SNC) systems.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20240702173820.90368-3-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/msr-index.h       |  1 +
 arch/x86/kernel/cpu/resctrl/core.c     |  2 ++
 arch/x86/kernel/cpu/resctrl/internal.h |  2 ++
 arch/x86/kernel/cpu/resctrl/monitor.c  | 20 ++++++++++++++++++++
 4 files changed, 25 insertions(+)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 47edd53ae5b8..5afb07c04669 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -1187,6 +1187,7 @@
 #define MSR_IA32_QM_CTR			0xc8e
 #define MSR_IA32_PQR_ASSOC		0xc8f
 #define MSR_IA32_L3_CBM_BASE		0xc90
+#define MSR_RMID_SNC_CONFIG		0xca0
 #define MSR_IA32_L2_CBM_BASE		0xd10
 #define MSR_IA32_MBA_THRTL_BASE		0xd50
 
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 1ea66af7cf0c..59961618a023 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -615,6 +615,8 @@ static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
 	}
 	cpumask_set_cpu(cpu, &d->hdr.cpu_mask);
 
+	arch_mon_domain_online(r, d);
+
 	if (arch_domain_mbm_alloc(r->num_rmid, hw_dom)) {
 		mon_domain_free(hw_dom);
 		return;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 16982d1baf99..955999aecfca 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -534,6 +534,8 @@ static inline bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l)
 
 int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
 
+void arch_mon_domain_online(struct rdt_resource *r, struct rdt_mon_domain *d);
+
 /*
  * To return the common struct rdt_resource, which is contained in struct
  * rdt_hw_resource, walk the resctrl member of struct rdt_hw_resource.
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 7ee4e0c90159..a62c4dc91161 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1091,6 +1091,26 @@ static void l3_mon_evt_init(struct rdt_resource *r)
 		list_add_tail(&mbm_local_event.list, &r->evt_list);
 }
 
+/*
+ * The power-on reset value of MSR_RMID_SNC_CONFIG is 0x1
+ * which indicates that RMIDs are configured in legacy mode.
+ * This mode is incompatible with Linux resctrl semantics
+ * as RMIDs are partitioned between SNC nodes, which requires
+ * a user to know which RMID is allocated to a task.
+ * Clearing bit 0 reconfigures the RMID counters for use
+ * in RMID sharing mode. This mode is better for Linux.
+ * The RMID space is divided between all SNC nodes with the
+ * RMIDs renumbered to start from zero in each node when
+ * counting operations from tasks. Code to read the counters
+ * must adjust RMID counter numbers based on SNC node. See
+ * logical_rmid_to_physical_rmid() for code that does this.
+ */
+void arch_mon_domain_online(struct rdt_resource *r, struct rdt_mon_domain *d)
+{
+	if (snc_nodes_per_l3_cache > 1)
+		msr_clear_bit(MSR_RMID_SNC_CONFIG, 0);
+}
+
 int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 {
 	unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
-- 
Gitee


From c7a204a738bebe4135694577a984de2251b480d5 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:18 -0700
Subject: [PATCH 187/280] x86/resctrl: Detect Sub-NUMA Cluster (SNC) mode

ANBZ: #31045

commit 13488150f5e2a9b84a335ae18bee33a918ead85d upstream.

There isn't a simple hardware bit that indicates whether a CPU is running in
Sub-NUMA Cluster (SNC) mode. Infer the state by comparing the number of CPUs
sharing the L3 cache with CPU0 to the number of CPUs in the same NUMA node as
CPU0.

Add the missing definition of pr_fmt() to monitor.c. This wasn't noticed
before as there are only "can't happen" console messages from this file.

  [ bp: Massage commit message. ]

Intel-SIG: commit 13488150f5e2 x86/resctrl: Detect Sub-NUMA Cluster (SNC) mode.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-19-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/monitor.c | 66 +++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index a62c4dc91161..851b561850e0 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -15,6 +15,8 @@
  * Software Developer Manual June 2016, volume 3, section 17.17.
  */
 
+#define pr_fmt(fmt)	"resctrl: " fmt
+
 #include <linux/cpu.h>
 #include <linux/module.h>
 #include <linux/sizes.h>
@@ -1111,6 +1113,68 @@ void arch_mon_domain_online(struct rdt_resource *r, struct rdt_mon_domain *d)
 		msr_clear_bit(MSR_RMID_SNC_CONFIG, 0);
 }
 
+/* CPU models that support MSR_RMID_SNC_CONFIG */
+static const struct x86_cpu_id snc_cpu_ids[] __initconst = {
+	X86_MATCH_VFM(INTEL_ICELAKE_X, 0),
+	X86_MATCH_VFM(INTEL_SAPPHIRERAPIDS_X, 0),
+	X86_MATCH_VFM(INTEL_EMERALDRAPIDS_X, 0),
+	X86_MATCH_VFM(INTEL_GRANITERAPIDS_X, 0),
+	X86_MATCH_VFM(INTEL_ATOM_CRESTMONT_X, 0),
+	{}
+};
+
+/*
+ * There isn't a simple hardware bit that indicates whether a CPU is running
+ * in Sub-NUMA Cluster (SNC) mode. Infer the state by comparing the
+ * number of CPUs sharing the L3 cache with CPU0 to the number of CPUs in
+ * the same NUMA node as CPU0.
+ * It is not possible to accurately determine SNC state if the system is
+ * booted with a maxcpus=N parameter. That distorts the ratio of SNC nodes
+ * to L3 caches. It will be OK if system is booted with hyperthreading
+ * disabled (since this doesn't affect the ratio).
+ */
+static __init int snc_get_config(void)
+{
+	struct cacheinfo *ci = get_cpu_cacheinfo_level(0, RESCTRL_L3_CACHE);
+	const cpumask_t *node0_cpumask;
+	int cpus_per_node, cpus_per_l3;
+	int ret;
+
+	if (!x86_match_cpu(snc_cpu_ids) || !ci)
+		return 1;
+
+	cpus_read_lock();
+	if (num_online_cpus() != num_present_cpus())
+		pr_warn("Some CPUs offline, SNC detection may be incorrect\n");
+	cpus_read_unlock();
+
+	node0_cpumask = cpumask_of_node(cpu_to_node(0));
+
+	cpus_per_node = cpumask_weight(node0_cpumask);
+	cpus_per_l3 = cpumask_weight(&ci->shared_cpu_map);
+
+	if (!cpus_per_node || !cpus_per_l3)
+		return 1;
+
+	ret = cpus_per_l3 / cpus_per_node;
+
+	/* sanity check: Only valid results are 1, 2, 3, 4 */
+	switch (ret) {
+	case 1:
+		break;
+	case 2 ... 4:
+		pr_info("Sub-NUMA Cluster mode detected with %d nodes per L3 cache\n", ret);
+		rdt_resources_all[RDT_RESOURCE_L3].r_resctrl.mon_scope = RESCTRL_L3_NODE;
+		break;
+	default:
+		pr_warn("Ignore improbable SNC node count %d\n", ret);
+		ret = 1;
+		break;
+	}
+
+	return ret;
+}
+
 int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 {
 	unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
@@ -1118,6 +1182,8 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 	unsigned int threshold;
 	int ret;
 
+	snc_nodes_per_l3_cache = snc_get_config();
+
 	resctrl_rmid_realloc_limit = boot_cpu_data.x86_cache_size * 1024;
 	hw_res->mon_scale = boot_cpu_data.x86_cache_occ_scale / snc_nodes_per_l3_cache;
 	r->num_rmid = (boot_cpu_data.x86_cache_max_rmid + 1) / snc_nodes_per_l3_cache;
-- 
Gitee


From 1f343bdfdf787d8093a61025f669a806e80b36cc Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 28 Jun 2024 14:56:19 -0700
Subject: [PATCH 188/280] x86/resctrl: Update documentation with Sub-NUMA
 cluster changes

ANBZ: #31045

commit ea34999f41873c96ac89e861e5fdfc7d0403f9e3 upstream.

With Sub-NUMA Cluster (SNC) mode enabled, the scope of monitoring resources
is per-NODE instead of per-L3 cache. Backwards compatibility is maintained
by providing files in the mon_L3_XX directories that sum event counts
for all SNC nodes sharing an L3 cache.

New files provide per-SNC node event counts.

Users should be aware that SNC mode also affects the amount of L3 cache
available for allocation within each SNC node.

Intel-SIG: commit ea34999f4187 x86/resctrl: Update documentation with Sub-NUMA cluster changes.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-20-tony.luck@intel.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/resctrl.rst | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 5f26c6267ac7..6f07af4a885e 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -375,6 +375,10 @@ When monitoring is enabled all MON groups will also contain:
 	all tasks in the group. In CTRL_MON groups these files provide
 	the sum for all tasks in the CTRL_MON group and all tasks in
 	MON groups. Please see example section for more details on usage.
+	On systems with Sub-NUMA Cluster (SNC) enabled there are extra
+	directories for each node (located within the "mon_L3_XX" directory
+	for the L3 cache they occupy). These are named "mon_sub_L3_YY"
+	where "YY" is the node number.
 
 "mon_hw_id":
 	Available only with debug option. The identifier used by hardware
@@ -484,6 +488,29 @@ if non-contiguous 1s value is supported. On a system with a 20-bit mask
 each bit represents 5% of the capacity of the cache. You could partition
 the cache into four equal parts with masks: 0x1f, 0x3e0, 0x7c00, 0xf8000.
 
+Notes on Sub-NUMA Cluster mode
+==============================
+When SNC mode is enabled, Linux may load balance tasks between Sub-NUMA
+nodes much more readily than between regular NUMA nodes since the CPUs
+on Sub-NUMA nodes share the same L3 cache and the system may report
+the NUMA distance between Sub-NUMA nodes with a lower value than used
+for regular NUMA nodes.
+
+The top-level monitoring files in each "mon_L3_XX" directory provide
+the sum of data across all SNC nodes sharing an L3 cache instance.
+Users who bind tasks to the CPUs of a specific Sub-NUMA node can read
+the "llc_occupancy", "mbm_total_bytes", and "mbm_local_bytes" in the
+"mon_sub_L3_YY" directories to get node local data.
+
+Memory bandwidth allocation is still performed at the L3 cache
+level. I.e. throttling controls are applied to all SNC nodes.
+
+L3 cache allocation bitmaps also apply to all SNC nodes. But note that
+the amount of L3 cache represented by each bit is divided by the number
+of SNC nodes per L3 cache. E.g. with a 100MB cache on a system with 10-bit
+allocation masks each bit normally represents 10MB. With SNC mode enabled
+with two SNC nodes per L3 cache, each bit only represents 5MB.
+
 Memory bandwidth Allocation and monitoring
 ==========================================
 
-- 
Gitee


From 57746390ec90c2cab3cda47a78273b6ec772556f Mon Sep 17 00:00:00 2001
From: Peter Newman <peternewman@google.com>
Date: Thu, 22 Aug 2024 12:02:11 -0700
Subject: [PATCH 189/280] x86/resctrl: Fix arch_mbm_* array overrun on SNC

ANBZ: #31045

commit a547a5880cba6f287179135381f1b484b251be31 upstream.

When using resctrl on systems with Sub-NUMA Clustering enabled, monitoring
groups may be allocated RMID values which would overrun the
arch_mbm_{local,total} arrays.

This is due to inconsistencies in whether the SNC-adjusted num_rmid value or
the unadjusted value in resctrl_arch_system_num_rmid_idx() is used. The
num_rmid value for the L3 resource is currently:

  resctrl_arch_system_num_rmid_idx() / snc_nodes_per_l3_cache

As a simple fix, make resctrl_arch_system_num_rmid_idx() return the
SNC-adjusted, L3 num_rmid value on x86.

Intel-SIG: commit a547a5880cba x86/resctrl: Fix arch_mbm_* array overrun on SNC.
Backporting patches for Intel RDT monitoring with SNC on Intel Xeon platform.

Fixes: e13db55b5a0d ("x86/resctrl: Introduce snc_nodes_per_l3_cache")
Signed-off-by: Peter Newman <peternewman@google.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20240822190212.1848788-1-peternewman@google.com
[ Xiaochen Shen: amend commit log ]
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h     | 6 ------
 arch/x86/kernel/cpu/resctrl/core.c | 8 ++++++++
 include/linux/resctrl.h            | 1 +
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 12dbd2588ca7..8b1b6ce1e51b 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -156,12 +156,6 @@ static inline void resctrl_sched_in(struct task_struct *tsk)
 		__resctrl_sched_in(tsk);
 }
 
-static inline u32 resctrl_arch_system_num_rmid_idx(void)
-{
-	/* RMID are independent numbers for x86. num_rmid_idx == num_rmid */
-	return boot_cpu_data.x86_cache_max_rmid + 1;
-}
-
 static inline void resctrl_arch_rmid_idx_decode(u32 idx, u32 *closid, u32 *rmid)
 {
 	*rmid = idx;
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 59961618a023..b681c2e07dbf 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -119,6 +119,14 @@ struct rdt_hw_resource rdt_resources_all[] = {
 	},
 };
 
+u32 resctrl_arch_system_num_rmid_idx(void)
+{
+	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+
+	/* RMID are independent numbers for x86. num_rmid_idx == num_rmid */
+	return r->num_rmid;
+}
+
 /*
  * cache_alloc_hsw_probe() - Have to probe for Intel haswell server CPUs
  * as they do not have CPUID enumeration support for Cache allocation.
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index b0875b99e811..d94abba1c716 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -248,6 +248,7 @@ struct resctrl_schema {
 
 /* The number of closid supported by this resource regardless of CDP */
 u32 resctrl_arch_get_num_closid(struct rdt_resource *r);
+u32 resctrl_arch_system_num_rmid_idx(void);
 int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid);
 
 /*
-- 
Gitee


From 1cf06a67ff48a962c1b54d6990c70a55aaff5884 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Thu, 31 Oct 2024 15:02:13 -0700
Subject: [PATCH 190/280] x86/resctrl: Support Sub-NUMA cluster mode SNC6

ANBZ: #31045

commit 9bce6e94c4b39b6baa649784d92f908aa9168a45 upstream.

Support Sub-NUMA cluster mode with 6 nodes per L3 cache (SNC6) on some
Intel platforms.

Intel-SIG: commit 9bce6e94c4b3 x86/resctrl: Support Sub-NUMA cluster
mode SNC6
Backport the support for Sub-NUMA cluster mode SNC6.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20241031220213.17991-1-tony.luck@intel.com
[ Zhiquan Li: amend commit log ]
Signed-off-by: Zhiquan Li <zhiquan1.li@intel.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/monitor.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 851b561850e0..5fcb3d635d91 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1158,11 +1158,12 @@ static __init int snc_get_config(void)
 
 	ret = cpus_per_l3 / cpus_per_node;
 
-	/* sanity check: Only valid results are 1, 2, 3, 4 */
+	/* sanity check: Only valid results are 1, 2, 3, 4, 6 */
 	switch (ret) {
 	case 1:
 		break;
 	case 2 ... 4:
+	case 6:
 		pr_info("Sub-NUMA Cluster mode detected with %d nodes per L3 cache\n", ret);
 		rdt_resources_all[RDT_RESOURCE_L3].r_resctrl.mon_scope = RESCTRL_L3_NODE;
 		break;
-- 
Gitee


From 4e5ec2ff9d30ef8b4fdcec959d1c7a2beb0f3ea3 Mon Sep 17 00:00:00 2001
From: Frederic Weisbecker <frederic@kernel.org>
Date: Wed, 7 Aug 2024 18:02:08 +0200
Subject: [PATCH 191/280] x86/resctrl: Use kthread_run_on_cpu()

ANBZ: #31045

commit 135eef38d7e081303fd9cdb982b37fcad32f9be0 upstream.

Use the proper API instead of open coding it.

Intel-SIG: commit 135eef38d7e0 x86/resctrl: Use kthread_run_on_cpu()
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20240807160228.26206-3-frederic@kernel.org
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 28 +++++++----------------
 1 file changed, 8 insertions(+), 20 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index e69489d48625..ae1f0c28eee6 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -1205,20 +1205,14 @@ static int pseudo_lock_measure_cycles(struct rdtgroup *rdtgrp, int sel)
 	plr->cpu = cpu;
 
 	if (sel == 1)
-		thread = kthread_create_on_node(measure_cycles_lat_fn, plr,
-						cpu_to_node(cpu),
-						"pseudo_lock_measure/%u",
-						cpu);
+		thread = kthread_run_on_cpu(measure_cycles_lat_fn, plr,
+					    cpu, "pseudo_lock_measure/%u");
 	else if (sel == 2)
-		thread = kthread_create_on_node(measure_l2_residency, plr,
-						cpu_to_node(cpu),
-						"pseudo_lock_measure/%u",
-						cpu);
+		thread = kthread_run_on_cpu(measure_l2_residency, plr,
+					    cpu, "pseudo_lock_measure/%u");
 	else if (sel == 3)
-		thread = kthread_create_on_node(measure_l3_residency, plr,
-						cpu_to_node(cpu),
-						"pseudo_lock_measure/%u",
-						cpu);
+		thread = kthread_run_on_cpu(measure_l3_residency, plr,
+					    cpu, "pseudo_lock_measure/%u");
 	else
 		goto out;
 
@@ -1226,8 +1220,6 @@ static int pseudo_lock_measure_cycles(struct rdtgroup *rdtgrp, int sel)
 		ret = PTR_ERR(thread);
 		goto out;
 	}
-	kthread_bind(thread, cpu);
-	wake_up_process(thread);
 
 	ret = wait_event_interruptible(plr->lock_thread_wq,
 				       plr->thread_done == 1);
@@ -1315,18 +1307,14 @@ int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
 
 	plr->thread_done = 0;
 
-	thread = kthread_create_on_node(pseudo_lock_fn, rdtgrp,
-					cpu_to_node(plr->cpu),
-					"pseudo_lock/%u", plr->cpu);
+	thread = kthread_run_on_cpu(pseudo_lock_fn, rdtgrp,
+				    plr->cpu, "pseudo_lock/%u");
 	if (IS_ERR(thread)) {
 		ret = PTR_ERR(thread);
 		rdt_last_cmd_printf("Locking thread returned error %d\n", ret);
 		goto out_cstates;
 	}
 
-	kthread_bind(thread, plr->cpu);
-	wake_up_process(thread);
-
 	ret = wait_event_interruptible(plr->lock_thread_wq,
 				       plr->thread_done == 1);
 	if (ret < 0) {
-- 
Gitee


From 2fd49559e23971704791e6f742626a6555967861 Mon Sep 17 00:00:00 2001
From: Babu Moger <babu.moger@amd.com>
Date: Fri, 6 Dec 2024 08:31:41 -0800
Subject: [PATCH 192/280] x86/resctrl: Introduce resctrl_file_fflags_init() to
 initialize fflags

ANBZ: #31045

commit 2937f9c361f7a8b230cd599e4af5264798bf4ce7 upstream.

thread_throttle_mode_init() and mbm_config_rftype_init() both initialize
fflags for resctrl files.

Adding new files will involve adding another function to initialize
the fflags. This can be simplified by adding a new function
resctrl_file_fflags_init() and passing the file name and flags
to be initialized.

Consolidate fflags initialization into resctrl_file_fflags_init() and
remove thread_throttle_mode_init() and mbm_config_rftype_init().

  [ Tony: Drop __init attribute so resctrl_file_fflags_init() can be used at
    run time. ]

Intel-SIG: commit 2937f9c361f7 x86/resctrl: Introduce resctrl_file_fflags_init() to initialize fflags
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20241206163148.83828-2-tony.luck@intel.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     |  4 +++-
 arch/x86/kernel/cpu/resctrl/internal.h |  3 +--
 arch/x86/kernel/cpu/resctrl/monitor.c  |  6 ++++--
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 15 ++-------------
 4 files changed, 10 insertions(+), 18 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index b681c2e07dbf..f3ee5859b69d 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -234,7 +234,9 @@ static __init bool __get_mem_config_intel(struct rdt_resource *r)
 		r->membw.throttle_mode = THREAD_THROTTLE_PER_THREAD;
 	else
 		r->membw.throttle_mode = THREAD_THROTTLE_MAX;
-	thread_throttle_mode_init();
+
+	resctrl_file_fflags_init("thread_throttle_mode",
+				 RFTYPE_CTRL_INFO | RFTYPE_RES_MB);
 
 	r->alloc_capable = true;
 
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 955999aecfca..faaff9d64102 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -647,8 +647,7 @@ void cqm_handle_limbo(struct work_struct *work);
 bool has_busy_rmid(struct rdt_mon_domain *d);
 void __check_limbo(struct rdt_mon_domain *d, bool force_free);
 void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
-void __init thread_throttle_mode_init(void);
-void __init mbm_config_rftype_init(const char *config);
+void resctrl_file_fflags_init(const char *config, unsigned long fflags);
 void rdt_staged_configs_clear(void);
 bool closid_allocated(unsigned int closid);
 int resctrl_find_cleanest_closid(void);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 5fcb3d635d91..69bdc11bacf8 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1224,11 +1224,13 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 
 		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL)) {
 			mbm_total_event.configurable = true;
-			mbm_config_rftype_init("mbm_total_bytes_config");
+			resctrl_file_fflags_init("mbm_total_bytes_config",
+						 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
 		}
 		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL)) {
 			mbm_local_event.configurable = true;
-			mbm_config_rftype_init("mbm_local_bytes_config");
+			resctrl_file_fflags_init("mbm_local_bytes_config",
+						 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
 		}
 	}
 
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index d7163b764c62..2b198ef95e1e 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2020,24 +2020,13 @@ static struct rftype *rdtgroup_get_rftype_by_name(const char *name)
 	return NULL;
 }
 
-void __init thread_throttle_mode_init(void)
-{
-	struct rftype *rft;
-
-	rft = rdtgroup_get_rftype_by_name("thread_throttle_mode");
-	if (!rft)
-		return;
-
-	rft->fflags = RFTYPE_CTRL_INFO | RFTYPE_RES_MB;
-}
-
-void __init mbm_config_rftype_init(const char *config)
+void resctrl_file_fflags_init(const char *config, unsigned long fflags)
 {
 	struct rftype *rft;
 
 	rft = rdtgroup_get_rftype_by_name(config);
 	if (rft)
-		rft->fflags = RFTYPE_MON_INFO | RFTYPE_RES_CACHE;
+		rft->fflags = fflags;
 }
 
 /**
-- 
Gitee


From 18ce016c9a7b72ace70956369f6b96301e954f3a Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 6 Dec 2024 08:31:42 -0800
Subject: [PATCH 193/280] x86/resctrl: Prepare for per-CTRL_MON group mba_MBps
 control

ANBZ: #31045

commit 3b49c37a2f4657730dd38a050b9d221363889dea upstream.

Resctrl uses local memory bandwidth event as input to the feedback loop when
the mba_MBps mount option is used. This means that this mount option cannot be
used on systems that only support monitoring of total bandwidth.

Prepare to allow users to choose the input event independently for each
CTRL_MON group by adding a global variable "mba_mbps_default_event" used to
set the default event for each CTRL_MON group, and a new field
"mba_mbps_event" in struct rdtgroup to track which event is used for each
CTRL_MON group.

Notes:

1) Both of these are only used when the user mounts the filesystem with the
   "mba_MBps" option.
2) Only check for support of local bandwidth event when initializing
   mba_mbps_default_event. Support for total bandwidth event can be added
   after other routines in resctrl have been updated to handle total bandwidth
   event.

  [ bp: Move mba_mbps_default_event extern into the arch header. ]

Intel-SIG: commit 3b49c37a2f46 x86/resctrl: Prepare for per-CTRL_MON group mba_MBps control
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20241206163148.83828-3-tony.luck@intel.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     |  3 +++
 arch/x86/kernel/cpu/resctrl/internal.h |  4 +++-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 13 +++++++++++++
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index f3ee5859b69d..94bf559966d6 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -963,6 +963,9 @@ static __init bool get_rdt_mon_resources(void)
 	if (!rdt_mon_features)
 		return false;
 
+	if (is_mbm_local_enabled())
+		mba_mbps_default_event = QOS_L3_MBM_LOCAL_EVENT_ID;
+
 	return !rdt_get_mon_l3_config(r);
 }
 
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index faaff9d64102..542d01c055aa 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -283,6 +283,7 @@ struct pseudo_lock_region {
  *				monitor only or ctrl_mon group
  * @mon:			mongroup related data
  * @mode:			mode of resource group
+ * @mba_mbps_event:		input monitoring event id when mba_sc is enabled
  * @plr:			pseudo-locked region
  */
 struct rdtgroup {
@@ -295,6 +296,7 @@ struct rdtgroup {
 	enum rdt_group_type		type;
 	struct mongroup			mon;
 	enum rdtgrp_mode		mode;
+	enum resctrl_event_id		mba_mbps_event;
 	struct pseudo_lock_region	*plr;
 };
 
@@ -508,6 +510,7 @@ extern struct mutex rdtgroup_mutex;
 extern struct rdt_hw_resource rdt_resources_all[];
 extern struct rdtgroup rdtgroup_default;
 extern struct dentry *debugfs_resctrl;
+extern enum resctrl_event_id mba_mbps_default_event;
 
 enum resctrl_res_level {
 	RDT_RESOURCE_L3,
@@ -651,5 +654,4 @@ void resctrl_file_fflags_init(const char *config, unsigned long fflags);
 void rdt_staged_configs_clear(void);
 bool closid_allocated(unsigned int closid);
 int resctrl_find_cleanest_closid(void);
-
 #endif /* _ASM_X86_RESCTRL_INTERNAL_H */
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 2b198ef95e1e..492d5b8670ed 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -65,6 +65,15 @@ static void rdtgroup_destroy_root(void);
 
 struct dentry *debugfs_resctrl;
 
+/*
+ * Memory bandwidth monitoring event to use for the default CTRL_MON group
+ * and each new CTRL_MON group created by the user.  Only relevant when
+ * the filesystem is mounted with the "mba_MBps" option so it does not
+ * matter that it remains uninitialized on systems that do not support
+ * the "mba_MBps" option.
+ */
+enum resctrl_event_id mba_mbps_default_event;
+
 static bool resctrl_debug;
 
 void rdt_last_cmd_clear(void)
@@ -2353,6 +2362,8 @@ static int set_mba_sc(bool mba_sc)
 
 	r->membw.mba_sc = mba_sc;
 
+	rdtgroup_default.mba_mbps_event = mba_mbps_default_event;
+
 	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
 		for (i = 0; i < num_closid; i++)
 			d->mbps_val[i] = MBA_MAX_MBPS;
@@ -3611,6 +3622,8 @@ static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn,
 			rdt_last_cmd_puts("kernfs subdir error\n");
 			goto out_del_list;
 		}
+		if (is_mba_sc(NULL))
+			rdtgrp->mba_mbps_event = mba_mbps_default_event;
 	}
 
 	goto out_unlock;
-- 
Gitee


From cf3fc94e8d921b131cd05cd93f41d2f303341504 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 6 Dec 2024 08:31:43 -0800
Subject: [PATCH 194/280] x86/resctrl: Modify update_mba_bw() to use per
 CTRL_MON group event

ANBZ: #31045

commit 481d363748b2df881df21569f3697b3c7fcf8fc1 upstream.

update_mba_bw() hard codes use of the memory bandwidth local event which
prevents more flexible options from being deployed.

Change this function to use the event specified in the rdtgroup that is
being processed.

Mount time checks for the "mba_MBps" option ensure that local memory
bandwidth is enabled. So drop the redundant is_mbm_local_enabled() check.

Intel-SIG: commit 481d363748b2 x86/resctrl: Modify update_mba_bw() to use per CTRL_MON group event
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20241206163148.83828-4-tony.luck@intel.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/monitor.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 69bdc11bacf8..adb18f088979 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -752,20 +752,20 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_mon_domain *dom_mbm)
 	u32 closid, rmid, cur_msr_val, new_msr_val;
 	struct mbm_state *pmbm_data, *cmbm_data;
 	struct rdt_ctrl_domain *dom_mba;
+	enum resctrl_event_id evt_id;
 	struct rdt_resource *r_mba;
-	u32 cur_bw, user_bw, idx;
 	struct list_head *head;
 	struct rdtgroup *entry;
-
-	if (!is_mbm_local_enabled())
-		return;
+	u32 cur_bw, user_bw;
 
 	r_mba = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl;
+	evt_id = rgrp->mba_mbps_event;
 
 	closid = rgrp->closid;
 	rmid = rgrp->mon.rmid;
-	idx = resctrl_arch_rmid_idx_encode(closid, rmid);
-	pmbm_data = &dom_mbm->mbm_local[idx];
+	pmbm_data = get_mbm_state(dom_mbm, closid, rmid, evt_id);
+	if (WARN_ON_ONCE(!pmbm_data))
+		return;
 
 	dom_mba = get_ctrl_domain_from_cpu(smp_processor_id(), r_mba);
 	if (!dom_mba) {
@@ -784,7 +784,9 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_mon_domain *dom_mbm)
 	 */
 	head = &rgrp->mon.crdtgrp_list;
 	list_for_each_entry(entry, head, mon.crdtgrp_list) {
-		cmbm_data = &dom_mbm->mbm_local[entry->mon.rmid];
+		cmbm_data = get_mbm_state(dom_mbm, entry->closid, entry->mon.rmid, evt_id);
+		if (WARN_ON_ONCE(!cmbm_data))
+			return;
 		cur_bw += cmbm_data->prev_bw;
 	}
 
-- 
Gitee


From 6309cd0ac40c60e150f7eb1c7f92b63ea6bd6641 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 6 Dec 2024 08:31:44 -0800
Subject: [PATCH 195/280] x86/resctrl: Compute memory bandwidth for all
 supported events

ANBZ: #31045

commit 2c272fadb58b590eb973c6c447b039f10631f5f7 upstream.

Switching between local and total memory bandwidth events as the input
to the mba_sc feedback loop would be cumbersome and take effect slowly
in the current implementation as the bandwidth is only known after two
consecutive readings of the same event.

Compute the bandwidth for all supported events. This doesn't add
significant overhead and will make changing which event is used
simple.

Intel-SIG: commit 2c272fadb58b x86/resctrl: Compute memory bandwidth for all supported events
Backport Resctrl/RDT-SNC for Intel platforms

Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20241206163148.83828-5-tony.luck@intel.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/monitor.c | 72 ++++++++++++---------------
 1 file changed, 33 insertions(+), 39 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index adb18f088979..94a1d9780461 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -663,9 +663,12 @@ static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
  */
 static void mbm_bw_count(u32 closid, u32 rmid, struct rmid_read *rr)
 {
-	u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
-	struct mbm_state *m = &rr->d->mbm_local[idx];
 	u64 cur_bw, bytes, cur_bytes;
+	struct mbm_state *m;
+
+	m = get_mbm_state(rr->d, closid, rmid, rr->evtid);
+	if (WARN_ON_ONCE(!m))
+		return;
 
 	cur_bytes = rr->val;
 	bytes = cur_bytes - m->prev_bw_bytes;
@@ -815,54 +818,45 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_mon_domain *dom_mbm)
 	resctrl_arch_update_one(r_mba, dom_mba, closid, CDP_NONE, new_msr_val);
 }
 
-static void mbm_update(struct rdt_resource *r, struct rdt_mon_domain *d,
-		       u32 closid, u32 rmid)
+static void mbm_update_one_event(struct rdt_resource *r, struct rdt_mon_domain *d,
+				 u32 closid, u32 rmid, enum resctrl_event_id evtid)
 {
 	struct rmid_read rr = {0};
 
 	rr.r = r;
 	rr.d = d;
+	rr.evtid = evtid;
+	rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
+	if (IS_ERR(rr.arch_mon_ctx)) {
+		pr_warn_ratelimited("Failed to allocate monitor context: %ld",
+				    PTR_ERR(rr.arch_mon_ctx));
+		return;
+	}
+
+	__mon_event_count(closid, rmid, &rr);
 
 	/*
-	 * This is protected from concurrent reads from user
-	 * as both the user and we hold the global mutex.
+	 * If the software controller is enabled, compute the
+	 * bandwidth for this event id.
 	 */
-	if (is_mbm_total_enabled()) {
-		rr.evtid = QOS_L3_MBM_TOTAL_EVENT_ID;
-		rr.val = 0;
-		rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
-		if (IS_ERR(rr.arch_mon_ctx)) {
-			pr_warn_ratelimited("Failed to allocate monitor context: %ld",
-					    PTR_ERR(rr.arch_mon_ctx));
-			return;
-		}
+	if (is_mba_sc(NULL))
+		mbm_bw_count(closid, rmid, &rr);
 
-		__mon_event_count(closid, rmid, &rr);
-
-		resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
-	}
-	if (is_mbm_local_enabled()) {
-		rr.evtid = QOS_L3_MBM_LOCAL_EVENT_ID;
-		rr.val = 0;
-		rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
-		if (IS_ERR(rr.arch_mon_ctx)) {
-			pr_warn_ratelimited("Failed to allocate monitor context: %ld",
-					    PTR_ERR(rr.arch_mon_ctx));
-			return;
-		}
-
-		__mon_event_count(closid, rmid, &rr);
+	resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
+}
 
-		/*
-		 * Call the MBA software controller only for the
-		 * control groups and when user has enabled
-		 * the software controller explicitly.
-		 */
-		if (is_mba_sc(NULL))
-			mbm_bw_count(closid, rmid, &rr);
+static void mbm_update(struct rdt_resource *r, struct rdt_mon_domain *d,
+		       u32 closid, u32 rmid)
+{
+	/*
+	 * This is protected from concurrent reads from user as both
+	 * the user and overflow handler hold the global mutex.
+	 */
+	if (is_mbm_total_enabled())
+		mbm_update_one_event(r, d, closid, rmid, QOS_L3_MBM_TOTAL_EVENT_ID);
 
-		resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
-	}
+	if (is_mbm_local_enabled())
+		mbm_update_one_event(r, d, closid, rmid, QOS_L3_MBM_LOCAL_EVENT_ID);
 }
 
 /*
-- 
Gitee


From 3af7c4159bd269536dcc48dd35332b5014788a76 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 6 Dec 2024 08:31:45 -0800
Subject: [PATCH 196/280] x86/resctrl: Make mba_sc use total bandwidth if local
 is not supported

ANBZ: #31045

commit 141cb5c482b38d7e494a207f881d0fe61e4848ef upstream.

The default input measurement to the mba_sc feedback loop for memory bandwidth
control when the user mounts with the "mba_MBps" option is the local bandwidth
event. But some systems may not support a local bandwidth event.

When local bandwidth event is not supported, check for support of total
bandwidth and use that instead.

Relax the mount option check to allow use of the "mba_MBps" option for systems
when only total bandwidth monitoring is supported. Also update the error
message.

Intel-SIG: commit 141cb5c482b3 x86/resctrl: Make mba_sc use total bandwidth if local is not supported
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20241206163148.83828-6-tony.luck@intel.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     | 2 ++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 94bf559966d6..3d1735ed8d1f 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -965,6 +965,8 @@ static __init bool get_rdt_mon_resources(void)
 
 	if (is_mbm_local_enabled())
 		mba_mbps_default_event = QOS_L3_MBM_LOCAL_EVENT_ID;
+	else if (is_mbm_total_enabled())
+		mba_mbps_default_event = QOS_L3_MBM_TOTAL_EVENT_ID;
 
 	return !rdt_get_mon_l3_config(r);
 }
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 492d5b8670ed..2d57f5dc15b6 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2341,7 +2341,7 @@ static bool supports_mba_mbps(void)
 	struct rdt_resource *rmbm = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
 	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl;
 
-	return (is_mbm_local_enabled() &&
+	return (is_mbm_enabled() &&
 		r->alloc_capable && is_mba_linear() &&
 		r->ctrl_scope == rmbm->mon_scope);
 }
@@ -2768,7 +2768,7 @@ static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
 		ctx->enable_cdpl2 = true;
 		return 0;
 	case Opt_mba_mbps:
-		msg = "mba_MBps requires local MBM and linear scale MBA at L3 scope";
+		msg = "mba_MBps requires MBM and linear scale MBA at L3 scope";
 		if (!supports_mba_mbps())
 			return invalfc(fc, msg);
 		ctx->enable_mba_mbps = true;
-- 
Gitee


From 2ca097aef08eeb36997150314396b64c9373016e Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 6 Dec 2024 08:31:46 -0800
Subject: [PATCH 197/280] x86/resctrl: Add "mba_MBps_event" file to CTRL_MON
 directories

ANBZ: #31045

commit f5cd0e316f14d79c9eb0cf8fe7e60cee3a657aa8 upstream.

The "mba_MBps" mount option provides an alternate method to control memory
bandwidth. Instead of specifying allowable bandwidth as a percentage of
maximum possible, the user provides a MiB/s limit value.

In preparation to allow the user to pick the memory bandwidth monitoring event
used as input to the feedback loop, provide a file in each CTRL_MON group
directory that shows the event currently in use. Note that this file is only
visible when the "mba_MBps" mount option is in use.

Intel-SIG: commit f5cd0e316f14 x86/resctrl: Add "mba_MBps_event" file to CTRL_MON directories
Backport Resctrl/RDT-SNC for Intel platforms

Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20241206163148.83828-7-tony.luck@intel.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 30 +++++++++++++++++++++++
 arch/x86/kernel/cpu/resctrl/internal.h    |  2 ++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 10 ++++++++
 3 files changed, 42 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 200d89a64027..5fa37b4ecc7a 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -518,6 +518,36 @@ static int smp_mon_event_count(void *arg)
 	return 0;
 }
 
+int rdtgroup_mba_mbps_event_show(struct kernfs_open_file *of,
+				 struct seq_file *s, void *v)
+{
+	struct rdtgroup *rdtgrp;
+	int ret = 0;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+
+	if (rdtgrp) {
+		switch (rdtgrp->mba_mbps_event) {
+		case QOS_L3_MBM_LOCAL_EVENT_ID:
+			seq_puts(s, "mbm_local_bytes\n");
+			break;
+		case QOS_L3_MBM_TOTAL_EVENT_ID:
+			seq_puts(s, "mbm_total_bytes\n");
+			break;
+		default:
+			pr_warn_once("Bad event %d\n", rdtgrp->mba_mbps_event);
+			ret = -EINVAL;
+			break;
+		}
+	} else {
+		ret = -ENOENT;
+	}
+
+	rdtgroup_kn_unlock(of->kn);
+
+	return ret;
+}
+
 void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 		    struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
 		    cpumask_t *cpumask, int evtid, int first)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 542d01c055aa..1bd61edbaf12 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -610,6 +610,8 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 				char *buf, size_t nbytes, loff_t off);
 int rdtgroup_schemata_show(struct kernfs_open_file *of,
 			   struct seq_file *s, void *v);
+int rdtgroup_mba_mbps_event_show(struct kernfs_open_file *of,
+				 struct seq_file *s, void *v);
 bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_ctrl_domain *d,
 			   unsigned long cbm, int closid, bool exclusive);
 unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_ctrl_domain *d,
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 2d57f5dc15b6..c6bead436e29 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1950,6 +1950,12 @@ static struct rftype res_common_files[] = {
 		.seq_show	= rdtgroup_schemata_show,
 		.fflags		= RFTYPE_CTRL_BASE,
 	},
+	{
+		.name		= "mba_MBps_event",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdtgroup_mba_mbps_event_show,
+	},
 	{
 		.name		= "mode",
 		.mode		= 0644,
@@ -2355,6 +2361,7 @@ static int set_mba_sc(bool mba_sc)
 	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl;
 	u32 num_closid = resctrl_arch_get_num_closid(r);
 	struct rdt_ctrl_domain *d;
+	unsigned long fflags;
 	int i;
 
 	if (!supports_mba_mbps() || mba_sc == is_mba_sc(r))
@@ -2369,6 +2376,9 @@ static int set_mba_sc(bool mba_sc)
 			d->mbps_val[i] = MBA_MAX_MBPS;
 	}
 
+	fflags = mba_sc ? RFTYPE_CTRL_BASE | RFTYPE_MON_BASE : 0;
+	resctrl_file_fflags_init("mba_MBps_event", fflags);
+
 	return 0;
 }
 
-- 
Gitee


From d46742f6400a5a90d60594184bc5de2a4a25fe17 Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 6 Dec 2024 08:31:47 -0800
Subject: [PATCH 198/280] x86/resctrl: Add write option to "mba_MBps_event"
 file

ANBZ: #31045

commit 8e931105acae688ff0fc8f875a6c05e5aed8ab79 upstream.

The "mba_MBps" mount option provides an alternate method to control memory
bandwidth. Instead of specifying allowable bandwidth as a percentage of
maximum possible, the user provides a MiB/s limit value.

There is a file in each CTRL_MON group directory that shows the event
currently in use.

Allow writing that file to choose a different event.

A user can choose any of the memory bandwidth monitoring events listed in
/sys/fs/resctrl/info/L3_mon/mon_features independently for each CTRL_MON group
by writing to each of the "mba_MBps_event" files.

Intel-SIG: commit 8e931105acae x86/resctrl: Add write option to "mba_MBps_event" file
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20241206163148.83828-8-tony.luck@intel.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 40 +++++++++++++++++++++++
 arch/x86/kernel/cpu/resctrl/internal.h    |  2 ++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    |  3 +-
 3 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 5fa37b4ecc7a..536351159cc2 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -518,6 +518,46 @@ static int smp_mon_event_count(void *arg)
 	return 0;
 }
 
+ssize_t rdtgroup_mba_mbps_event_write(struct kernfs_open_file *of,
+				      char *buf, size_t nbytes, loff_t off)
+{
+	struct rdtgroup *rdtgrp;
+	int ret = 0;
+
+	/* Valid input requires a trailing newline */
+	if (nbytes == 0 || buf[nbytes - 1] != '\n')
+		return -EINVAL;
+	buf[nbytes - 1] = '\0';
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		rdtgroup_kn_unlock(of->kn);
+		return -ENOENT;
+	}
+	rdt_last_cmd_clear();
+
+	if (!strcmp(buf, "mbm_local_bytes")) {
+		if (is_mbm_local_enabled())
+			rdtgrp->mba_mbps_event = QOS_L3_MBM_LOCAL_EVENT_ID;
+		else
+			ret = -EINVAL;
+	} else if (!strcmp(buf, "mbm_total_bytes")) {
+		if (is_mbm_total_enabled())
+			rdtgrp->mba_mbps_event = QOS_L3_MBM_TOTAL_EVENT_ID;
+		else
+			ret = -EINVAL;
+	} else {
+		ret = -EINVAL;
+	}
+
+	if (ret)
+		rdt_last_cmd_printf("Unsupported event id '%s'\n", buf);
+
+	rdtgroup_kn_unlock(of->kn);
+
+	return ret ?: nbytes;
+}
+
 int rdtgroup_mba_mbps_event_show(struct kernfs_open_file *of,
 				 struct seq_file *s, void *v)
 {
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 1bd61edbaf12..20c898f09b7e 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -610,6 +610,8 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 				char *buf, size_t nbytes, loff_t off);
 int rdtgroup_schemata_show(struct kernfs_open_file *of,
 			   struct seq_file *s, void *v);
+ssize_t rdtgroup_mba_mbps_event_write(struct kernfs_open_file *of,
+				      char *buf, size_t nbytes, loff_t off);
 int rdtgroup_mba_mbps_event_show(struct kernfs_open_file *of,
 				 struct seq_file *s, void *v);
 bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_ctrl_domain *d,
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index c6bead436e29..b9337f4a2dac 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1952,8 +1952,9 @@ static struct rftype res_common_files[] = {
 	},
 	{
 		.name		= "mba_MBps_event",
-		.mode		= 0444,
+		.mode		= 0644,
 		.kf_ops		= &rdtgroup_kf_single_ops,
+		.write		= rdtgroup_mba_mbps_event_write,
 		.seq_show	= rdtgroup_mba_mbps_event_show,
 	},
 	{
-- 
Gitee


From 1c64a1d0d6fb5519f452b178e6c24b885e9e4c8a Mon Sep 17 00:00:00 2001
From: Tony Luck <tony.luck@intel.com>
Date: Fri, 6 Dec 2024 08:31:48 -0800
Subject: [PATCH 199/280] x86/resctrl: Document the new "mba_MBps_event" file

ANBZ: #31045

commit faf6ef673787956ec4d33ac8bf56f8ea929abf37 upstream.

Add a section to document a new read/write file that shows/sets the memory
bandwidth event used to control bandwidth used by each CTRL_MON group.

Intel-SIG: commit faf6ef673787 x86/resctrl: Document the new "mba_MBps_event" file
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20241206163148.83828-9-tony.luck@intel.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/resctrl.rst | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 6f07af4a885e..3676e22dfe2b 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -384,6 +384,16 @@ When monitoring is enabled all MON groups will also contain:
 	Available only with debug option. The identifier used by hardware
 	for the monitor group. On x86 this is the RMID.
 
+When the "mba_MBps" mount option is used all CTRL_MON groups will also contain:
+
+"mba_MBps_event":
+	Reading this file shows which memory bandwidth event is used
+	as input to the software feedback loop that keeps memory bandwidth
+	below the value specified in the schemata file. Writing the
+	name of one of the supported memory bandwidth events found in
+	/sys/fs/resctrl/info/L3_MON/mon_features changes the input
+	event.
+
 Resource allocation rules
 -------------------------
 
-- 
Gitee


From 1347c3cf8809f1c87ce40c765f2fd40bc81e0a4d Mon Sep 17 00:00:00 2001
From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Date: Sat, 13 Jul 2024 13:02:32 +0200
Subject: [PATCH 200/280] x86/resctrl: Slightly clean-up mbm_config_show()

ANBZ: #31045

commit 29eaa79583671f1e1b468760d505ef837317ab15 upstream.

'mon_info' is already zeroed in the list_for_each_entry() loop below.  There
is no need to explicitly initialize it here. It just wastes some space and
cycles.

Remove this un-needed code.

On a x86_64, with allmodconfig:

  Before:
  ======
     text	   data	    bss	    dec	    hex	filename
    74967	   5103	   1880	  81950	  1401e	arch/x86/kernel/cpu/resctrl/rdtgroup.o

  After:
  =====
     text	   data	    bss	    dec	    hex	filename
    74903	   5103	   1880	  81886	  13fde	arch/x86/kernel/cpu/resctrl/rdtgroup.o

Intel-SIG: commit 29eaa7958367 x86/resctrl: Slightly clean-up mbm_config_show()
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/b2ebc809c8b6c6440d17b12ccf7c2d29aaafd488.1720868538.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index b9337f4a2dac..6419e04d8a7b 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1605,7 +1605,7 @@ static void mondata_config_read(struct rdt_mon_domain *d, struct mon_config_info
 
 static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid)
 {
-	struct mon_config_info mon_info = {0};
+	struct mon_config_info mon_info;
 	struct rdt_mon_domain *dom;
 	bool sep = false;
 
-- 
Gitee


From d5d16a18b15d25961444c3f53a817de4a8f0cfc9 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:36:46 +0000
Subject: [PATCH 201/280] x86/resctrl: Fix allocation of cleanest CLOSID on
 platforms with no monitors

ANBZ: #31045

commit a121798ae669351ec0697c94f71c3a692b2a755b upstream.

Commit

  6eac36bb9eb0 ("x86/resctrl: Allocate the cleanest CLOSID by searching closid_num_dirty_rmid")

added logic that causes resctrl to search for the CLOSID with the fewest dirty
cache lines when creating a new control group, if requested by the arch code.
This depends on the values read from the llc_occupancy counters. The logic is
applicable to architectures where the CLOSID effectively forms part of the
monitoring identifier and so do not allow complete freedom to choose an unused
monitoring identifier for a given CLOSID.

This support missed that some platforms may not have these counters.  This
causes a NULL pointer dereference when creating a new control group as the
array was not allocated by dom_data_init().

As this feature isn't necessary on platforms that don't have cache occupancy
monitors, add this to the check that occurs when a new control group is
allocated.

Intel-SIG: commit a121798ae669 x86/resctrl: Fix allocation of cleanest CLOSID on platforms with no monitors
Backport Resctrl/RDT-SNC for Intel platforms

Fixes: 6eac36bb9eb0 ("x86/resctrl: Allocate the cleanest CLOSID by searching closid_num_dirty_rmid")
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-2-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 6419e04d8a7b..04b653d613e8 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -157,7 +157,8 @@ static int closid_alloc(void)
 
 	lockdep_assert_held(&rdtgroup_mutex);
 
-	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
+	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID) &&
+	    is_llc_occupancy_enabled()) {
 		cleanest_closid = resctrl_find_cleanest_closid();
 		if (cleanest_closid < 0)
 			return cleanest_closid;
-- 
Gitee


From fe6e03541bfc06dc662704017f35d1e0aa10d2bd Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:36:47 +0000
Subject: [PATCH 202/280] x86/resctrl: Add a helper to avoid reaching into the
 arch code resource list

ANBZ: #31045

commit 3c021531131c9ee5df5da739819a515326ee9570 upstream.

Resctrl occasionally wants to know something about a specific resource, in
these cases it reaches into the arch code's rdt_resources_all[] array.

Once the filesystem parts of resctrl are moved to /fs/, this means it will
need visibility of the architecture specific struct rdt_hw_resource
definition, and the array of all resources.  All architectures would also need
a r_resctrl member in this struct.

Instead, abstract this via a helper to allow architectures to do different
things here. Move the level enum to the resctrl header and add a helper to
retrieve the struct rdt_resource by 'rid'.

resctrl_arch_get_resource() should not return NULL for any value in the enum,
it may instead return a dummy resource that is !alloc_enabled && !mon_enabled.

Intel-SIG: commit 3c021531131c x86/resctrl: Add a helper to avoid reaching into the arch code resource list
Backport Resctrl/RDT-SNC for Intel platforms

Co-developed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-3-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        | 12 ++++++++++--
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  2 +-
 arch/x86/kernel/cpu/resctrl/internal.h    | 10 ----------
 arch/x86/kernel/cpu/resctrl/monitor.c     |  8 ++++----
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 14 +++++++-------
 include/linux/resctrl.h                   | 17 +++++++++++++++++
 6 files changed, 39 insertions(+), 24 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 3d1735ed8d1f..12b41316d8f7 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -62,7 +62,7 @@ static void mba_wrmsr_amd(struct msr_param *m);
 #define ctrl_domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].r_resctrl.ctrl_domains)
 #define mon_domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].r_resctrl.mon_domains)
 
-struct rdt_hw_resource rdt_resources_all[] = {
+struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 	[RDT_RESOURCE_L3] =
 	{
 		.r_resctrl = {
@@ -127,6 +127,14 @@ u32 resctrl_arch_system_num_rmid_idx(void)
 	return r->num_rmid;
 }
 
+struct rdt_resource *resctrl_arch_get_resource(enum resctrl_res_level l)
+{
+	if (l >= RDT_NUM_RESOURCES)
+		return NULL;
+
+	return &rdt_resources_all[l].r_resctrl;
+}
+
 /*
  * cache_alloc_hsw_probe() - Have to probe for Intel haswell server CPUs
  * as they do not have CPUID enumeration support for Cache allocation.
@@ -174,7 +182,7 @@ static inline void cache_alloc_hsw_probe(void)
 bool is_mba_sc(struct rdt_resource *r)
 {
 	if (!r)
-		return rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl.membw.mba_sc;
+		r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
 
 	/*
 	 * The software controller support is only applicable to MBA resource.
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 536351159cc2..4af27ef5a8a1 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -649,7 +649,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 	resid = md.u.rid;
 	domid = md.u.domid;
 	evtid = md.u.evtid;
-	r = &rdt_resources_all[resid].r_resctrl;
+	r = resctrl_arch_get_resource(resid);
 
 	if (md.u.sum) {
 		/*
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 20c898f09b7e..75252a7e1ebc 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -512,16 +512,6 @@ extern struct rdtgroup rdtgroup_default;
 extern struct dentry *debugfs_resctrl;
 extern enum resctrl_event_id mba_mbps_default_event;
 
-enum resctrl_res_level {
-	RDT_RESOURCE_L3,
-	RDT_RESOURCE_L2,
-	RDT_RESOURCE_MBA,
-	RDT_RESOURCE_SMBA,
-
-	/* Must be the last */
-	RDT_NUM_RESOURCES,
-};
-
 static inline struct rdt_resource *resctrl_inc(struct rdt_resource *res)
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(res);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 94a1d9780461..58b5b21349a8 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -365,7 +365,7 @@ static void limbo_release_entry(struct rmid_entry *entry)
  */
 void __check_limbo(struct rdt_mon_domain *d, bool force_free)
 {
-	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
 	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
 	struct rmid_entry *entry;
 	u32 idx, cur_idx = 1;
@@ -521,7 +521,7 @@ int alloc_rmid(u32 closid)
 
 static void add_rmid_to_limbo(struct rmid_entry *entry)
 {
-	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
 	struct rdt_mon_domain *d;
 	u32 idx;
 
@@ -761,7 +761,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_mon_domain *dom_mbm)
 	struct rdtgroup *entry;
 	u32 cur_bw, user_bw;
 
-	r_mba = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl;
+	r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
 	evt_id = rgrp->mba_mbps_event;
 
 	closid = rgrp->closid;
@@ -925,7 +925,7 @@ void mbm_handle_overflow(struct work_struct *work)
 	if (!resctrl_mounted || !resctrl_arch_mon_capable())
 		goto out_unlock;
 
-	r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+	r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
 	d = container_of(work, struct rdt_mon_domain, mbm_over.work);
 
 	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 04b653d613e8..45093b9e8e63 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2256,7 +2256,7 @@ static void l2_qos_cfg_update(void *arg)
 
 static inline bool is_mba_linear(void)
 {
-	return rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl.membw.delay_linear;
+	return resctrl_arch_get_resource(RDT_RESOURCE_MBA)->membw.delay_linear;
 }
 
 static int set_cache_qos_cfg(int level, bool enable)
@@ -2346,8 +2346,8 @@ static void mba_sc_domain_destroy(struct rdt_resource *r,
  */
 static bool supports_mba_mbps(void)
 {
-	struct rdt_resource *rmbm = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
-	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl;
+	struct rdt_resource *rmbm = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
 
 	return (is_mbm_enabled() &&
 		r->alloc_capable && is_mba_linear() &&
@@ -2360,7 +2360,7 @@ static bool supports_mba_mbps(void)
  */
 static int set_mba_sc(bool mba_sc)
 {
-	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl;
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
 	u32 num_closid = resctrl_arch_get_num_closid(r);
 	struct rdt_ctrl_domain *d;
 	unsigned long fflags;
@@ -2714,7 +2714,7 @@ static int rdt_get_tree(struct fs_context *fc)
 		resctrl_mounted = true;
 
 	if (is_mbm_enabled()) {
-		r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+		r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
 		list_for_each_entry(dom, &r->mon_domains, hdr.list)
 			mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL,
 						   RESCTRL_PICK_ANY_CPU);
@@ -3951,7 +3951,7 @@ static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
 	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2))
 		seq_puts(seq, ",cdpl2");
 
-	if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl))
+	if (is_mba_sc(resctrl_arch_get_resource(RDT_RESOURCE_MBA)))
 		seq_puts(seq, ",mba_MBps");
 
 	if (resctrl_debug)
@@ -4151,7 +4151,7 @@ static void clear_childcpus(struct rdtgroup *r, unsigned int cpu)
 
 void resctrl_offline_cpu(unsigned int cpu)
 {
-	struct rdt_resource *l3 = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+	struct rdt_resource *l3 = resctrl_arch_get_resource(RDT_RESOURCE_L3);
 	struct rdt_mon_domain *d;
 	struct rdtgroup *rdtgrp;
 
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index d94abba1c716..37279e2a89da 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -37,6 +37,16 @@ enum resctrl_conf_type {
 	CDP_DATA,
 };
 
+enum resctrl_res_level {
+	RDT_RESOURCE_L3,
+	RDT_RESOURCE_L2,
+	RDT_RESOURCE_MBA,
+	RDT_RESOURCE_SMBA,
+
+	/* Must be the last */
+	RDT_NUM_RESOURCES,
+};
+
 #define CDP_NUM_TYPES	(CDP_DATA + 1)
 
 /*
@@ -226,6 +236,13 @@ struct rdt_resource {
 	bool			cdp_capable;
 };
 
+/*
+ * Get the resource that exists at this level. If the level is not supported
+ * a dummy/not-capable resource can be returned. Levels >= RDT_NUM_RESOURCES
+ * will return NULL.
+ */
+struct rdt_resource *resctrl_arch_get_resource(enum resctrl_res_level l);
+
 /**
  * struct resctrl_schema - configuration abilities of a resource presented to
  *			   user-space
-- 
Gitee


From 4f95519f46563ddf79f4a2df6bbeb6c47b41e3e0 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:36:48 +0000
Subject: [PATCH 203/280] x86/resctrl: Remove fflags from struct rdt_resource

ANBZ: #31045

commit 131dab13a82d9edd97dd96d98d2919f56f339331 upstream.

The resctrl arch code specifies whether a resource controls a cache or memory
using the fflags field. This field is then used by resctrl to determine which
files should be exposed in the filesystem.

Allowing the architecture to pick this value means the RFTYPE_ flags have to
be in a shared header, and allows an architecture to create a combination that
resctrl does not support.

Remove the fflags field, and pick the value based on the resource id.

Intel-SIG: commit 131dab13a82d x86/resctrl: Remove fflags from struct rdt_resource
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-4-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     |  4 ----
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 18 ++++++++++++++++--
 include/linux/resctrl.h                |  2 --
 3 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 12b41316d8f7..8ef2e449b465 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -74,7 +74,6 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 			.mon_domains		= mon_domain_init(RDT_RESOURCE_L3),
 			.parse_ctrlval		= parse_cbm,
 			.format_str		= "%d=%0*x",
-			.fflags			= RFTYPE_RES_CACHE,
 		},
 		.msr_base		= MSR_IA32_L3_CBM_BASE,
 		.msr_update		= cat_wrmsr,
@@ -88,7 +87,6 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_L2),
 			.parse_ctrlval		= parse_cbm,
 			.format_str		= "%d=%0*x",
-			.fflags			= RFTYPE_RES_CACHE,
 		},
 		.msr_base		= MSR_IA32_L2_CBM_BASE,
 		.msr_update		= cat_wrmsr,
@@ -102,7 +100,6 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_MBA),
 			.parse_ctrlval		= parse_bw,
 			.format_str		= "%d=%*u",
-			.fflags			= RFTYPE_RES_MB,
 		},
 	},
 	[RDT_RESOURCE_SMBA] =
@@ -114,7 +111,6 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_SMBA),
 			.parse_ctrlval		= parse_bw,
 			.format_str		= "%d=%*u",
-			.fflags			= RFTYPE_RES_MB,
 		},
 	},
 };
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 45093b9e8e63..3391ac8ecb2d 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2165,6 +2165,20 @@ static int rdtgroup_mkdir_info_resdir(void *priv, char *name,
 	return ret;
 }
 
+static unsigned long fflags_from_resource(struct rdt_resource *r)
+{
+	switch (r->rid) {
+	case RDT_RESOURCE_L3:
+	case RDT_RESOURCE_L2:
+		return RFTYPE_RES_CACHE;
+	case RDT_RESOURCE_MBA:
+	case RDT_RESOURCE_SMBA:
+		return RFTYPE_RES_MB;
+	}
+
+	return WARN_ON_ONCE(1);
+}
+
 static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
 {
 	struct resctrl_schema *s;
@@ -2185,14 +2199,14 @@ static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
 	/* loop over enabled controls, these are all alloc_capable */
 	list_for_each_entry(s, &resctrl_schema_all, list) {
 		r = s->res;
-		fflags = r->fflags | RFTYPE_CTRL_INFO;
+		fflags = fflags_from_resource(r) | RFTYPE_CTRL_INFO;
 		ret = rdtgroup_mkdir_info_resdir(s, s->name, fflags);
 		if (ret)
 			goto out_destroy;
 	}
 
 	for_each_mon_capable_rdt_resource(r) {
-		fflags = r->fflags | RFTYPE_MON_INFO;
+		fflags = fflags_from_resource(r) | RFTYPE_MON_INFO;
 		sprintf(name, "%s_MON", r->name);
 		ret = rdtgroup_mkdir_info_resdir(r, name, fflags);
 		if (ret)
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 37279e2a89da..496ddcaa4ecf 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -210,7 +210,6 @@ enum resctrl_scope {
  * @format_str:		Per resource format string to show domain value
  * @parse_ctrlval:	Per resource function pointer to parse control values
  * @evt_list:		List of monitoring events
- * @fflags:		flags to choose base and info files
  * @cdp_capable:	Is the CDP feature available on this resource
  */
 struct rdt_resource {
@@ -232,7 +231,6 @@ struct rdt_resource {
 						 struct resctrl_schema *s,
 						 struct rdt_ctrl_domain *d);
 	struct list_head	evt_list;
-	unsigned long		fflags;
 	bool			cdp_capable;
 };
 
-- 
Gitee


From 459ddfa5300ed38251febd30e8facfeb2164ae8e Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:36:49 +0000
Subject: [PATCH 204/280] x86/resctrl: Use schema type to determine how to
 parse schema values

ANBZ: #31045

commit c24f5eab6b2689fd4e97a2d2fe963864036653e6 upstream.

Resctrl's architecture code gets to specify a function pointer that is used
when parsing schema entries. This is expected to be one of two helpers from
the filesystem code.

Setting this function pointer allows the architecture code to change the ABI
resctrl presents to user-space, and forces resctrl to expose these helpers.

Instead, add a schema format enum to choose which schema parser to use. This
allows the helpers to be made static and the structs used for passing
arguments moved out of shared headers.

Intel-SIG: commit c24f5eab6b26 x86/resctrl: Use schema type to determine how to parse schema values
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-5-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        |  8 +++---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 32 +++++++++++++++++++----
 arch/x86/kernel/cpu/resctrl/internal.h    | 10 -------
 include/linux/resctrl.h                   | 17 ++++++++----
 4 files changed, 43 insertions(+), 24 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 8ef2e449b465..e9fe129a02f8 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -72,7 +72,7 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 			.mon_scope		= RESCTRL_L3_CACHE,
 			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_L3),
 			.mon_domains		= mon_domain_init(RDT_RESOURCE_L3),
-			.parse_ctrlval		= parse_cbm,
+			.schema_fmt		= RESCTRL_SCHEMA_BITMAP,
 			.format_str		= "%d=%0*x",
 		},
 		.msr_base		= MSR_IA32_L3_CBM_BASE,
@@ -85,7 +85,7 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 			.name			= "L2",
 			.ctrl_scope		= RESCTRL_L2_CACHE,
 			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_L2),
-			.parse_ctrlval		= parse_cbm,
+			.schema_fmt		= RESCTRL_SCHEMA_BITMAP,
 			.format_str		= "%d=%0*x",
 		},
 		.msr_base		= MSR_IA32_L2_CBM_BASE,
@@ -98,7 +98,7 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 			.name			= "MB",
 			.ctrl_scope		= RESCTRL_L3_CACHE,
 			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_MBA),
-			.parse_ctrlval		= parse_bw,
+			.schema_fmt		= RESCTRL_SCHEMA_RANGE,
 			.format_str		= "%d=%*u",
 		},
 	},
@@ -109,7 +109,7 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 			.name			= "SMBA",
 			.ctrl_scope		= RESCTRL_L3_CACHE,
 			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_SMBA),
-			.parse_ctrlval		= parse_bw,
+			.schema_fmt		= RESCTRL_SCHEMA_RANGE,
 			.format_str		= "%d=%*u",
 		},
 	},
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 4af27ef5a8a1..f4334f437ffc 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -23,6 +23,15 @@
 
 #include "internal.h"
 
+struct rdt_parse_data {
+	struct rdtgroup		*rdtgrp;
+	char			*buf;
+};
+
+typedef int (ctrlval_parser_t)(struct rdt_parse_data *data,
+			       struct resctrl_schema *s,
+			       struct rdt_ctrl_domain *d);
+
 /*
  * Check whether MBA bandwidth percentage value is correct. The value is
  * checked against the minimum and max bandwidth values specified by the
@@ -64,8 +73,8 @@ static bool bw_validate(char *buf, u32 *data, struct rdt_resource *r)
 	return true;
 }
 
-int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
-	     struct rdt_ctrl_domain *d)
+static int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
+		    struct rdt_ctrl_domain *d)
 {
 	struct resctrl_staged_config *cfg;
 	u32 closid = data->rdtgrp->closid;
@@ -143,8 +152,8 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
  * Read one cache bit mask (hex). Check that it is valid for the current
  * resource type.
  */
-int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
-	      struct rdt_ctrl_domain *d)
+static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
+		     struct rdt_ctrl_domain *d)
 {
 	struct rdtgroup *rdtgrp = data->rdtgrp;
 	struct resctrl_staged_config *cfg;
@@ -210,6 +219,7 @@ static int parse_line(char *line, struct resctrl_schema *s,
 		      struct rdtgroup *rdtgrp)
 {
 	enum resctrl_conf_type t = s->conf_type;
+	ctrlval_parser_t *parse_ctrlval = NULL;
 	struct resctrl_staged_config *cfg;
 	struct rdt_resource *r = s->res;
 	struct rdt_parse_data data;
@@ -220,6 +230,18 @@ static int parse_line(char *line, struct resctrl_schema *s,
 	/* Walking r->domains, ensure it can't race with cpuhp */
 	lockdep_assert_cpus_held();
 
+	switch (r->schema_fmt) {
+	case RESCTRL_SCHEMA_BITMAP:
+		parse_ctrlval = &parse_cbm;
+		break;
+	case RESCTRL_SCHEMA_RANGE:
+		parse_ctrlval = &parse_bw;
+		break;
+	}
+
+	if (WARN_ON_ONCE(!parse_ctrlval))
+		return -EINVAL;
+
 	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
 	    (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)) {
 		rdt_last_cmd_puts("Cannot pseudo-lock MBA resource\n");
@@ -240,7 +262,7 @@ static int parse_line(char *line, struct resctrl_schema *s,
 		if (d->hdr.id == dom_id) {
 			data.buf = dom;
 			data.rdtgrp = rdtgrp;
-			if (r->parse_ctrlval(&data, s, d))
+			if (parse_ctrlval(&data, s, d))
 				return -EINVAL;
 			if (rdtgrp->mode ==  RDT_MODE_PSEUDO_LOCKSETUP) {
 				cfg = &d->staged_config[t];
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 75252a7e1ebc..b5543bd506c3 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -459,11 +459,6 @@ static inline bool is_mbm_event(int e)
 		e <= QOS_L3_MBM_LOCAL_EVENT_ID);
 }
 
-struct rdt_parse_data {
-	struct rdtgroup		*rdtgrp;
-	char			*buf;
-};
-
 /**
  * struct rdt_hw_resource - arch private attributes of a resctrl resource
  * @r_resctrl:		Attributes of the resource used directly by resctrl.
@@ -500,11 +495,6 @@ static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r
 	return container_of(r, struct rdt_hw_resource, r_resctrl);
 }
 
-int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
-	      struct rdt_ctrl_domain *d);
-int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
-	     struct rdt_ctrl_domain *d);
-
 extern struct mutex rdtgroup_mutex;
 
 extern struct rdt_hw_resource rdt_resources_all[];
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 496ddcaa4ecf..3e1a41356b2a 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -183,7 +183,6 @@ struct resctrl_membw {
 	u32				*mb_map;
 };
 
-struct rdt_parse_data;
 struct resctrl_schema;
 
 enum resctrl_scope {
@@ -192,6 +191,16 @@ enum resctrl_scope {
 	RESCTRL_L3_NODE,
 };
 
+/**
+ * enum resctrl_schema_fmt - The format user-space provides for a schema.
+ * @RESCTRL_SCHEMA_BITMAP:	The schema is a bitmap in hex.
+ * @RESCTRL_SCHEMA_RANGE:	The schema is a decimal number.
+ */
+enum resctrl_schema_fmt {
+	RESCTRL_SCHEMA_BITMAP,
+	RESCTRL_SCHEMA_RANGE,
+};
+
 /**
  * struct rdt_resource - attributes of a resctrl resource
  * @rid:		The index of the resource
@@ -208,7 +217,7 @@ enum resctrl_scope {
  * @data_width:		Character width of data when displaying
  * @default_ctrl:	Specifies default cache cbm or memory B/W percent.
  * @format_str:		Per resource format string to show domain value
- * @parse_ctrlval:	Per resource function pointer to parse control values
+ * @schema_fmt:		Which format string and parser is used for this schema.
  * @evt_list:		List of monitoring events
  * @cdp_capable:	Is the CDP feature available on this resource
  */
@@ -227,9 +236,7 @@ struct rdt_resource {
 	int			data_width;
 	u32			default_ctrl;
 	const char		*format_str;
-	int			(*parse_ctrlval)(struct rdt_parse_data *data,
-						 struct resctrl_schema *s,
-						 struct rdt_ctrl_domain *d);
+	enum resctrl_schema_fmt	schema_fmt;
 	struct list_head	evt_list;
 	bool			cdp_capable;
 };
-- 
Gitee


From aff82c48d3385eeab61b8f3ed403ed4b667e0347 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:36:50 +0000
Subject: [PATCH 205/280] x86/resctrl: Use schema type to determine the schema
 format string

ANBZ: #31045

commit bb9343c8f2906ac7087a7f9560b37636c220551d upstream.

Resctrl's architecture code gets to specify a format string that is
used when printing schema entries. This is expected to be one of two
values that the filesystem code supports.

Setting this format string allows the architecture code to change
the ABI resctrl presents to user-space.

Instead, use the schema format enum to choose which format string to
use.

Intel-SIG: commit bb9343c8f290 x86/resctrl: Use schema type to determine the schema format string
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-6-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        |  4 ----
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  2 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 14 ++++++++++++++
 include/linux/resctrl.h                   |  4 ++--
 4 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index e9fe129a02f8..542503a8c953 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -73,7 +73,6 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_L3),
 			.mon_domains		= mon_domain_init(RDT_RESOURCE_L3),
 			.schema_fmt		= RESCTRL_SCHEMA_BITMAP,
-			.format_str		= "%d=%0*x",
 		},
 		.msr_base		= MSR_IA32_L3_CBM_BASE,
 		.msr_update		= cat_wrmsr,
@@ -86,7 +85,6 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 			.ctrl_scope		= RESCTRL_L2_CACHE,
 			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_L2),
 			.schema_fmt		= RESCTRL_SCHEMA_BITMAP,
-			.format_str		= "%d=%0*x",
 		},
 		.msr_base		= MSR_IA32_L2_CBM_BASE,
 		.msr_update		= cat_wrmsr,
@@ -99,7 +97,6 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 			.ctrl_scope		= RESCTRL_L3_CACHE,
 			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_MBA),
 			.schema_fmt		= RESCTRL_SCHEMA_RANGE,
-			.format_str		= "%d=%*u",
 		},
 	},
 	[RDT_RESOURCE_SMBA] =
@@ -110,7 +107,6 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 			.ctrl_scope		= RESCTRL_L3_CACHE,
 			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_SMBA),
 			.schema_fmt		= RESCTRL_SCHEMA_RANGE,
-			.format_str		= "%d=%*u",
 		},
 	},
 };
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index f4334f437ffc..c763cb4fb1a8 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -487,7 +487,7 @@ static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int clo
 			ctrl_val = resctrl_arch_get_config(r, dom, closid,
 							   schema->conf_type);
 
-		seq_printf(s, r->format_str, dom->hdr.id, max_data_width,
+		seq_printf(s, schema->fmt_str, dom->hdr.id, max_data_width,
 			   ctrl_val);
 		sep = true;
 	}
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 3391ac8ecb2d..e7862d0936c9 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2611,6 +2611,20 @@ static int schemata_list_add(struct rdt_resource *r, enum resctrl_conf_type type
 	if (cl > max_name_width)
 		max_name_width = cl;
 
+	switch (r->schema_fmt) {
+	case RESCTRL_SCHEMA_BITMAP:
+		s->fmt_str = "%d=%0*x";
+		break;
+	case RESCTRL_SCHEMA_RANGE:
+		s->fmt_str = "%d=%0*u";
+		break;
+	}
+
+	if (WARN_ON_ONCE(!s->fmt_str)) {
+		kfree(s);
+		return -EINVAL;
+	}
+
 	INIT_LIST_HEAD(&s->list);
 	list_add(&s->list, &resctrl_schema_all);
 
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 3e1a41356b2a..736b9a9a9464 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -216,7 +216,6 @@ enum resctrl_schema_fmt {
  * @name:		Name to use in "schemata" file.
  * @data_width:		Character width of data when displaying
  * @default_ctrl:	Specifies default cache cbm or memory B/W percent.
- * @format_str:		Per resource format string to show domain value
  * @schema_fmt:		Which format string and parser is used for this schema.
  * @evt_list:		List of monitoring events
  * @cdp_capable:	Is the CDP feature available on this resource
@@ -235,7 +234,6 @@ struct rdt_resource {
 	char			*name;
 	int			data_width;
 	u32			default_ctrl;
-	const char		*format_str;
 	enum resctrl_schema_fmt	schema_fmt;
 	struct list_head	evt_list;
 	bool			cdp_capable;
@@ -253,6 +251,7 @@ struct rdt_resource *resctrl_arch_get_resource(enum resctrl_res_level l);
  *			   user-space
  * @list:	Member of resctrl_schema_all.
  * @name:	The name to use in the "schemata" file.
+ * @fmt_str:	Format string to show domain value.
  * @conf_type:	Whether this schema is specific to code/data.
  * @res:	The resource structure exported by the architecture to describe
  *		the hardware that is configured by this schema.
@@ -263,6 +262,7 @@ struct rdt_resource *resctrl_arch_get_resource(enum resctrl_res_level l);
 struct resctrl_schema {
 	struct list_head		list;
 	char				name[8];
+	const char			*fmt_str;
 	enum resctrl_conf_type		conf_type;
 	struct rdt_resource		*res;
 	u32				num_closid;
-- 
Gitee


From 219d9da2c79ef2d14cad168bcf0f6e39b657421c Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:36:51 +0000
Subject: [PATCH 206/280] x86/resctrl: Remove data_width and the tabular format

ANBZ: #31045

commit 43312b8ea1c61abbc5e3bdc87fe2e18f755d549d upstream.

The resctrl architecture code provides a data_width for the controls of each
resource. This is used to zero pad all control values in the schemata file so
they appear in columns. The same is done with the resource names to complete
the visual effect. e.g.

  | SMBA:0=2048
  |   L3:0=00ff

AMD platforms discover their maximum bandwidth for the MB resource from
firmware, but hard-code the data_width to 4. If the maximum bandwidth requires
more digits - the tabular format is silently broken.  This is also broken when
the mba_MBps mount option is used as the field width isn't updated. If new
schema are added resctrl will need to be able to determine the maximum width.
The benefit of this pretty-printing is questionable.

Instead of handling runtime discovery of the data_width for AMD platforms,
remove the feature. These fields are always zero padded so should be harmless
to remove if the whole field has been treated as a number.  In the above
example, this would now look like this:

  | SMBA:0=2048
  |   L3:0=ff

Intel-SIG: commit 43312b8ea1c6 x86/resctrl: Remove data_width and the tabular format
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-7-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        | 26 -----------------------
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  3 +--
 arch/x86/kernel/cpu/resctrl/internal.h    |  2 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 10 +++++++--
 include/linux/resctrl.h                   |  2 --
 5 files changed, 10 insertions(+), 33 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 542503a8c953..754fb65565ec 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -43,12 +43,6 @@ static DEFINE_MUTEX(domain_list_lock);
  */
 DEFINE_PER_CPU(struct resctrl_pqr_state, pqr_state);
 
-/*
- * Used to store the max resource name width and max resource data width
- * to display the schemata in a tabular format
- */
-int max_name_width, max_data_width;
-
 /*
  * Global boolean for rdt_alloc which is true if any
  * resource allocation is enabled.
@@ -228,7 +222,6 @@ static __init bool __get_mem_config_intel(struct rdt_resource *r)
 			return false;
 		r->membw.arch_needs_linear = false;
 	}
-	r->data_width = 3;
 
 	if (boot_cpu_has(X86_FEATURE_PER_THREAD_MBA))
 		r->membw.throttle_mode = THREAD_THROTTLE_PER_THREAD;
@@ -269,8 +262,6 @@ static __init bool __rdt_get_mem_config_amd(struct rdt_resource *r)
 	r->membw.throttle_mode = THREAD_THROTTLE_UNDEFINED;
 	r->membw.min_bw = 0;
 	r->membw.bw_gran = 1;
-	/* Max value is 2048, Data width should be 4 in decimal */
-	r->data_width = 4;
 
 	r->alloc_capable = true;
 
@@ -290,7 +281,6 @@ static void rdt_get_cache_alloc_cfg(int idx, struct rdt_resource *r)
 	r->cache.cbm_len = eax.split.cbm_len + 1;
 	r->default_ctrl = BIT_MASK(eax.split.cbm_len + 1) - 1;
 	r->cache.shareable_bits = ebx & r->default_ctrl;
-	r->data_width = (r->cache.cbm_len + 3) / 4;
 	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
 		r->cache.arch_has_sparse_bitmasks = ecx.split.noncont;
 	r->alloc_capable = true;
@@ -786,20 +776,6 @@ static int resctrl_arch_offline_cpu(unsigned int cpu)
 	return 0;
 }
 
-/*
- * Choose a width for the resource name and resource data based on the
- * resource that has widest name and cbm.
- */
-static __init void rdt_init_padding(void)
-{
-	struct rdt_resource *r;
-
-	for_each_alloc_capable_rdt_resource(r) {
-		if (r->data_width > max_data_width)
-			max_data_width = r->data_width;
-	}
-}
-
 enum {
 	RDT_FLAG_CMT,
 	RDT_FLAG_MBM_TOTAL,
@@ -1102,8 +1078,6 @@ static int __init resctrl_late_init(void)
 	if (!get_rdt_resources())
 		return -ENODEV;
 
-	rdt_init_padding();
-
 	state = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
 				  "x86/resctrl/cat:online:",
 				  resctrl_arch_online_cpu,
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index c763cb4fb1a8..59610b209b4e 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -487,8 +487,7 @@ static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int clo
 			ctrl_val = resctrl_arch_get_config(r, dom, closid,
 							   schema->conf_type);
 
-		seq_printf(s, schema->fmt_str, dom->hdr.id, max_data_width,
-			   ctrl_val);
+		seq_printf(s, schema->fmt_str, dom->hdr.id, ctrl_val);
 		sep = true;
 	}
 	seq_puts(s, "\n");
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index b5543bd506c3..f975cd6cfe61 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -326,7 +326,7 @@ struct rdtgroup {
 /* List of all resource groups */
 extern struct list_head rdt_all_groups;
 
-extern int max_name_width, max_data_width;
+extern int max_name_width;
 
 int __init rdtgroup_init(void);
 void __exit rdtgroup_exit(void);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index e7862d0936c9..1e0bae1a9d95 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -57,6 +57,12 @@ static struct kernfs_node *kn_mongrp;
 /* Kernel fs node for "mon_data" directory under root */
 static struct kernfs_node *kn_mondata;
 
+/*
+ * Used to store the max resource name width to display the schemata names in
+ * a tabular format.
+ */
+int max_name_width;
+
 static struct seq_buf last_cmd_status;
 static char last_cmd_status_buf[512];
 
@@ -2613,10 +2619,10 @@ static int schemata_list_add(struct rdt_resource *r, enum resctrl_conf_type type
 
 	switch (r->schema_fmt) {
 	case RESCTRL_SCHEMA_BITMAP:
-		s->fmt_str = "%d=%0*x";
+		s->fmt_str = "%d=%x";
 		break;
 	case RESCTRL_SCHEMA_RANGE:
-		s->fmt_str = "%d=%0*u";
+		s->fmt_str = "%d=%u";
 		break;
 	}
 
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 736b9a9a9464..e1a982adef45 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -214,7 +214,6 @@ enum resctrl_schema_fmt {
  * @ctrl_domains:	RCU list of all control domains for this resource
  * @mon_domains:	RCU list of all monitor domains for this resource
  * @name:		Name to use in "schemata" file.
- * @data_width:		Character width of data when displaying
  * @default_ctrl:	Specifies default cache cbm or memory B/W percent.
  * @schema_fmt:		Which format string and parser is used for this schema.
  * @evt_list:		List of monitoring events
@@ -232,7 +231,6 @@ struct rdt_resource {
 	struct list_head	ctrl_domains;
 	struct list_head	mon_domains;
 	char			*name;
-	int			data_width;
 	u32			default_ctrl;
 	enum resctrl_schema_fmt	schema_fmt;
 	struct list_head	evt_list;
-- 
Gitee


From 825bacc4b0ac1aa9936e3c03b4d6c70a3b6eacaf Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:36:52 +0000
Subject: [PATCH 207/280] x86/resctrl: Add max_bw to struct resctrl_membw

ANBZ: #31045

commit 634ebb98b929443ea1a5502c93f26d01aedbd5c8 upstream.

__rdt_get_mem_config_amd() and __get_mem_config_intel() both use the
default_ctrl property as a maximum value. This is because the MBA schema works
differently between these platforms. Doing this complicates determining
whether the default_ctrl property belongs to the arch code, or can be derived
from the schema format.

Deriving the maximum or default value from the schema format would avoid the
architecture code having to tell resctrl such obvious things as the maximum
percentage is 100, and the maximum bitmap is all ones.

Maximum bandwidth is always going to vary per platform. Add max_bw as
a special case. This is currently used for the maximum MBA percentage on Intel
platforms, but can be removed from the architecture code if 'percentage'
becomes a schema format resctrl supports directly.

This value isn't needed for other schema formats.

This will allow the default_ctrl to be generated from the schema properties
when it is needed.

Intel-SIG: commit 634ebb98b929 x86/resctrl: Add max_bw to struct resctrl_membw
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-8-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        | 2 ++
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 4 ++--
 include/linux/resctrl.h                   | 2 ++
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 754fb65565ec..4504a12efc97 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -212,6 +212,7 @@ static __init bool __get_mem_config_intel(struct rdt_resource *r)
 	hw_res->num_closid = edx.split.cos_max + 1;
 	max_delay = eax.split.max_delay + 1;
 	r->default_ctrl = MAX_MBA_BW;
+	r->membw.max_bw = MAX_MBA_BW;
 	r->membw.arch_needs_linear = true;
 	if (ecx & MBA_IS_LINEAR) {
 		r->membw.delay_linear = true;
@@ -250,6 +251,7 @@ static __init bool __rdt_get_mem_config_amd(struct rdt_resource *r)
 	cpuid_count(0x80000020, subleaf, &eax, &ebx, &ecx, &edx);
 	hw_res->num_closid = edx + 1;
 	r->default_ctrl = 1 << eax;
+	r->membw.max_bw = 1 << eax;
 
 	/* AMD does not use delay */
 	r->membw.delay_linear = false;
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 59610b209b4e..23a01eaebd58 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -63,9 +63,9 @@ static bool bw_validate(char *buf, u32 *data, struct rdt_resource *r)
 		return true;
 	}
 
-	if (bw < r->membw.min_bw || bw > r->default_ctrl) {
+	if (bw < r->membw.min_bw || bw > r->membw.max_bw) {
 		rdt_last_cmd_printf("MB value %u out of range [%d,%d]\n",
-				    bw, r->membw.min_bw, r->default_ctrl);
+				    bw, r->membw.min_bw, r->membw.max_bw);
 		return false;
 	}
 
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index e1a982adef45..465f3cf8c4bc 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -165,6 +165,7 @@ enum membw_throttle_mode {
 /**
  * struct resctrl_membw - Memory bandwidth allocation related data
  * @min_bw:		Minimum memory bandwidth percentage user can request
+ * @max_bw:		Maximum memory bandwidth value, used as the reset value
  * @bw_gran:		Granularity at which the memory bandwidth is allocated
  * @delay_linear:	True if memory B/W delay is in linear scale
  * @arch_needs_linear:	True if we can't configure non-linear resources
@@ -175,6 +176,7 @@ enum membw_throttle_mode {
  */
 struct resctrl_membw {
 	u32				min_bw;
+	u32				max_bw;
 	u32				bw_gran;
 	u32				delay_linear;
 	bool				arch_needs_linear;
-- 
Gitee


From 8e57f7d997ed69ea6d9cad534d99dc6ff64541ff Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:36:53 +0000
Subject: [PATCH 208/280] x86/resctrl: Generate default_ctrl instead of sharing
 it

ANBZ: #31045

commit dbc58f7eec4039ee8f3ec27b2b41d89500debfac upstream.

The struct rdt_resource default_ctrl is used by both the architecture code for
resetting the hardware controls, and sometimes by the filesystem code as the
default value for the schema, unless the bandwidth software controller is in
use.

Having the default exposed by the architecture code causes unnecessary
duplication for each architecture as the default value must be specified, but
can be derived from other schema properties. Now that the maximum bandwidth is
explicitly described, resctrl can derive the default value from the schema
format and the other resource properties.

Intel-SIG: commit dbc58f7eec40 x86/resctrl: Generate default_ctrl instead of sharing it
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-9-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        | 13 +++++--------
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  5 +++--
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    |  6 +++---
 include/linux/resctrl.h                   | 19 +++++++++++++++++--
 4 files changed, 28 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 4504a12efc97..d001ca43b53d 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -155,7 +155,6 @@ static inline void cache_alloc_hsw_probe(void)
 		return;
 
 	hw_res->num_closid = 4;
-	r->default_ctrl = max_cbm;
 	r->cache.cbm_len = 20;
 	r->cache.shareable_bits = 0xc0000;
 	r->cache.min_cbm_bits = 2;
@@ -211,7 +210,6 @@ static __init bool __get_mem_config_intel(struct rdt_resource *r)
 	cpuid_count(0x00000010, 3, &eax.full, &ebx, &ecx, &edx.full);
 	hw_res->num_closid = edx.split.cos_max + 1;
 	max_delay = eax.split.max_delay + 1;
-	r->default_ctrl = MAX_MBA_BW;
 	r->membw.max_bw = MAX_MBA_BW;
 	r->membw.arch_needs_linear = true;
 	if (ecx & MBA_IS_LINEAR) {
@@ -250,7 +248,6 @@ static __init bool __rdt_get_mem_config_amd(struct rdt_resource *r)
 
 	cpuid_count(0x80000020, subleaf, &eax, &ebx, &ecx, &edx);
 	hw_res->num_closid = edx + 1;
-	r->default_ctrl = 1 << eax;
 	r->membw.max_bw = 1 << eax;
 
 	/* AMD does not use delay */
@@ -276,13 +273,13 @@ static void rdt_get_cache_alloc_cfg(int idx, struct rdt_resource *r)
 	union cpuid_0x10_1_eax eax;
 	union cpuid_0x10_x_ecx ecx;
 	union cpuid_0x10_x_edx edx;
-	u32 ebx;
+	u32 ebx, default_ctrl;
 
 	cpuid_count(0x00000010, idx, &eax.full, &ebx, &ecx.full, &edx.full);
 	hw_res->num_closid = edx.split.cos_max + 1;
 	r->cache.cbm_len = eax.split.cbm_len + 1;
-	r->default_ctrl = BIT_MASK(eax.split.cbm_len + 1) - 1;
-	r->cache.shareable_bits = ebx & r->default_ctrl;
+	default_ctrl = BIT_MASK(eax.split.cbm_len + 1) - 1;
+	r->cache.shareable_bits = ebx & default_ctrl;
 	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
 		r->cache.arch_has_sparse_bitmasks = ecx.split.noncont;
 	r->alloc_capable = true;
@@ -329,7 +326,7 @@ static u32 delay_bw_map(unsigned long bw, struct rdt_resource *r)
 		return MAX_MBA_BW - bw;
 
 	pr_warn_once("Non Linear delay-bw map not supported but queried\n");
-	return r->default_ctrl;
+	return MAX_MBA_BW;
 }
 
 static void mba_wrmsr_intel(struct msr_param *m)
@@ -438,7 +435,7 @@ static void setup_default_ctrlval(struct rdt_resource *r, u32 *dc)
 	 * For Memory Allocation: Set b/w requested to 100%
 	 */
 	for (i = 0; i < hw_res->num_closid; i++, dc++)
-		*dc = r->default_ctrl;
+		*dc = resctrl_get_default_ctrl(r);
 }
 
 static void ctrl_domain_free(struct rdt_hw_ctrl_domain *hw_dom)
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 23a01eaebd58..5d87f279085f 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -113,8 +113,9 @@ static int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
  */
 static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
 {
-	unsigned long first_bit, zero_bit, val;
+	u32 supported_bits = BIT_MASK(r->cache.cbm_len) - 1;
 	unsigned int cbm_len = r->cache.cbm_len;
+	unsigned long first_bit, zero_bit, val;
 	int ret;
 
 	ret = kstrtoul(buf, 16, &val);
@@ -123,7 +124,7 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
 		return false;
 	}
 
-	if ((r->cache.min_cbm_bits > 0 && val == 0) || val > r->default_ctrl) {
+	if ((r->cache.min_cbm_bits > 0 && val == 0) || val > supported_bits) {
 		rdt_last_cmd_puts("Mask out of range\n");
 		return false;
 	}
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 1e0bae1a9d95..cd8f65c12124 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -978,7 +978,7 @@ static int rdt_default_ctrl_show(struct kernfs_open_file *of,
 	struct resctrl_schema *s = of->kn->parent->priv;
 	struct rdt_resource *r = s->res;
 
-	seq_printf(seq, "%x\n", r->default_ctrl);
+	seq_printf(seq, "%x\n", resctrl_get_default_ctrl(r));
 	return 0;
 }
 
@@ -2882,7 +2882,7 @@ static int reset_all_ctrls(struct rdt_resource *r)
 		hw_dom = resctrl_to_arch_ctrl_dom(d);
 
 		for (i = 0; i < hw_res->num_closid; i++)
-			hw_dom->ctrl_val[i] = r->default_ctrl;
+			hw_dom->ctrl_val[i] = resctrl_get_default_ctrl(r);
 		msr_param.dom = d;
 		smp_call_function_any(&d->hdr.cpu_mask, rdt_ctrl_update, &msr_param, 1);
 	}
@@ -3417,7 +3417,7 @@ static void rdtgroup_init_mba(struct rdt_resource *r, u32 closid)
 		}
 
 		cfg = &d->staged_config[CDP_NONE];
-		cfg->new_ctrl = r->default_ctrl;
+		cfg->new_ctrl = resctrl_get_default_ctrl(r);
 		cfg->have_new_ctrl = true;
 	}
 }
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 465f3cf8c4bc..d16dc960f1fc 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -216,7 +216,6 @@ enum resctrl_schema_fmt {
  * @ctrl_domains:	RCU list of all control domains for this resource
  * @mon_domains:	RCU list of all monitor domains for this resource
  * @name:		Name to use in "schemata" file.
- * @default_ctrl:	Specifies default cache cbm or memory B/W percent.
  * @schema_fmt:		Which format string and parser is used for this schema.
  * @evt_list:		List of monitoring events
  * @cdp_capable:	Is the CDP feature available on this resource
@@ -233,7 +232,6 @@ struct rdt_resource {
 	struct list_head	ctrl_domains;
 	struct list_head	mon_domains;
 	char			*name;
-	u32			default_ctrl;
 	enum resctrl_schema_fmt	schema_fmt;
 	struct list_head	evt_list;
 	bool			cdp_capable;
@@ -268,6 +266,23 @@ struct resctrl_schema {
 	u32				num_closid;
 };
 
+/**
+ * resctrl_get_default_ctrl() - Return the default control value for this
+ *                              resource.
+ * @r:		The resource whose default control type is queried.
+ */
+static inline u32 resctrl_get_default_ctrl(struct rdt_resource *r)
+{
+	switch (r->schema_fmt) {
+	case RESCTRL_SCHEMA_BITMAP:
+		return BIT_MASK(r->cache.cbm_len) - 1;
+	case RESCTRL_SCHEMA_RANGE:
+		return r->membw.max_bw;
+	}
+
+	return WARN_ON_ONCE(1);
+}
+
 /* The number of closid supported by this resource regardless of CDP */
 u32 resctrl_arch_get_num_closid(struct rdt_resource *r);
 u32 resctrl_arch_system_num_rmid_idx(void);
-- 
Gitee


From ae941bc45eb72c4a87ca77e49faec540f87f86f7 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:36:54 +0000
Subject: [PATCH 209/280] x86/resctrl: Add helper for setting CPU default
 properties

ANBZ: #31045

commit aebd5354dd191860033f8599048d3d3998482ee7 upstream.

rdtgroup_rmdir_ctrl() and rdtgroup_rmdir_mon() set the per-CPU pqr_state for
CPUs that were part of the rmdir()'d group.

Another architecture might not have a 'pqr_state', its hardware may need the
values in a different format. MPAM's equivalent of RMID values are not unique,
and always need the CLOSID to be provided too.

There is only one caller that modifies a single value, (rdtgroup_rmdir_mon()).
MPAM always needs both CLOSID and RMID for the hardware value as these are
written to the same system register.

As rdtgroup_rmdir_mon() has the CLOSID on hand, only provide a helper to set
both values. These values are read by __resctrl_sched_in(), but may be written
by a different CPU without any locking, add READ/WRTE_ONCE() to avoid torn
values.

Intel-SIG: commit aebd5354dd19 x86/resctrl: Add helper for setting CPU default properties
Backport Resctrl/RDT-SNC for Intel platforms

Co-developed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-10-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h         | 14 +++++++++++---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 20 ++++++++++++++------
 2 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 8b1b6ce1e51b..6908cd0e6e40 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -4,8 +4,9 @@
 
 #ifdef CONFIG_X86_CPU_RESCTRL
 
-#include <linux/sched.h>
 #include <linux/jump_label.h>
+#include <linux/percpu.h>
+#include <linux/sched.h>
 
 /*
  * This value can never be a valid CLOSID, and is used when mapping a
@@ -96,8 +97,8 @@ static inline void resctrl_arch_disable_mon(void)
 static inline void __resctrl_sched_in(struct task_struct *tsk)
 {
 	struct resctrl_pqr_state *state = this_cpu_ptr(&pqr_state);
-	u32 closid = state->default_closid;
-	u32 rmid = state->default_rmid;
+	u32 closid = READ_ONCE(state->default_closid);
+	u32 rmid = READ_ONCE(state->default_rmid);
 	u32 tmp;
 
 	/*
@@ -132,6 +133,13 @@ static inline unsigned int resctrl_arch_round_mon_val(unsigned int val)
 	return val * scale;
 }
 
+static inline void resctrl_arch_set_cpu_default_closid_rmid(int cpu, u32 closid,
+							    u32 rmid)
+{
+	WRITE_ONCE(per_cpu(pqr_state.default_closid, cpu), closid);
+	WRITE_ONCE(per_cpu(pqr_state.default_rmid, cpu), rmid);
+}
+
 static inline void resctrl_arch_set_closid_rmid(struct task_struct *tsk,
 						u32 closid, u32 rmid)
 {
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index cd8f65c12124..f706e5a288b1 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -3731,14 +3731,21 @@ static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
 static int rdtgroup_rmdir_mon(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
 {
 	struct rdtgroup *prdtgrp = rdtgrp->mon.parent;
+	u32 closid, rmid;
 	int cpu;
 
 	/* Give any tasks back to the parent group */
 	rdt_move_group_tasks(rdtgrp, prdtgrp, tmpmask);
 
-	/* Update per cpu rmid of the moved CPUs first */
+	/*
+	 * Update per cpu closid/rmid of the moved CPUs first.
+	 * Note: the closid will not change, but the arch code still needs it.
+	 */
+	closid = prdtgrp->closid;
+	rmid = prdtgrp->mon.rmid;
 	for_each_cpu(cpu, &rdtgrp->cpu_mask)
-		per_cpu(pqr_state.default_rmid, cpu) = prdtgrp->mon.rmid;
+		resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
+
 	/*
 	 * Update the MSR on moved CPUs and CPUs which have moved
 	 * task running on them.
@@ -3771,6 +3778,7 @@ static int rdtgroup_ctrl_remove(struct rdtgroup *rdtgrp)
 
 static int rdtgroup_rmdir_ctrl(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
 {
+	u32 closid, rmid;
 	int cpu;
 
 	/* Give any tasks back to the default group */
@@ -3781,10 +3789,10 @@ static int rdtgroup_rmdir_ctrl(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
 		   &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);
 
 	/* Update per cpu closid and rmid of the moved CPUs first */
-	for_each_cpu(cpu, &rdtgrp->cpu_mask) {
-		per_cpu(pqr_state.default_closid, cpu) = rdtgroup_default.closid;
-		per_cpu(pqr_state.default_rmid, cpu) = rdtgroup_default.mon.rmid;
-	}
+	closid = rdtgroup_default.closid;
+	rmid = rdtgroup_default.mon.rmid;
+	for_each_cpu(cpu, &rdtgrp->cpu_mask)
+		resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
 
 	/*
 	 * Update the MSR on moved CPUs and CPUs which have moved
-- 
Gitee


From 5dafba1099f218a53be9c18e10c40bc05764355b Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:36:55 +0000
Subject: [PATCH 210/280] x86/resctrl: Remove rdtgroup from
 update_cpu_closid_rmid()

ANBZ: #31045

commit 6f06aee356bfd0c817cbe83debedd240fbed0719 upstream.

update_cpu_closid_rmid() takes a struct rdtgroup as an argument, which it uses
to update the local CPUs default pqr values. This is a problem once the
resctrl parts move out to /fs/, as the arch code cannot poke around inside
struct rdtgroup.

Rename update_cpu_closid_rmid() as resctrl_arch_sync_cpus_defaults() to be
used as the target of an IPI, and pass the effective CLOSID and RMID in a new
struct.

Intel-SIG: commit 6f06aee356bf x86/resctrl: Remove rdtgroup from update_cpu_closid_rmid()
Backport Resctrl/RDT-SNC for Intel platforms

Co-developed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-11-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 17 +++++++++++++----
 include/linux/resctrl.h                | 22 ++++++++++++++++++++++
 2 files changed, 35 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index f706e5a288b1..62d9a50c7bba 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -355,13 +355,13 @@ static int rdtgroup_cpus_show(struct kernfs_open_file *of,
  * from update_closid_rmid() is protected against __switch_to() because
  * preemption is disabled.
  */
-static void update_cpu_closid_rmid(void *info)
+void resctrl_arch_sync_cpu_closid_rmid(void *info)
 {
-	struct rdtgroup *r = info;
+	struct resctrl_cpu_defaults *r = info;
 
 	if (r) {
 		this_cpu_write(pqr_state.default_closid, r->closid);
-		this_cpu_write(pqr_state.default_rmid, r->mon.rmid);
+		this_cpu_write(pqr_state.default_rmid, r->rmid);
 	}
 
 	/*
@@ -376,11 +376,20 @@ static void update_cpu_closid_rmid(void *info)
  * Update the PGR_ASSOC MSR on all cpus in @cpu_mask,
  *
  * Per task closids/rmids must have been set up before calling this function.
+ * @r may be NULL.
  */
 static void
 update_closid_rmid(const struct cpumask *cpu_mask, struct rdtgroup *r)
 {
-	on_each_cpu_mask(cpu_mask, update_cpu_closid_rmid, r, 1);
+	struct resctrl_cpu_defaults defaults, *p = NULL;
+
+	if (r) {
+		defaults.closid = r->closid;
+		defaults.rmid = r->mon.rmid;
+		p = &defaults;
+	}
+
+	on_each_cpu_mask(cpu_mask, resctrl_arch_sync_cpu_closid_rmid, p, 1);
 }
 
 static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index d16dc960f1fc..31808b3ddecb 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -266,6 +266,28 @@ struct resctrl_schema {
 	u32				num_closid;
 };
 
+struct resctrl_cpu_defaults {
+	u32 closid;
+	u32 rmid;
+};
+
+/**
+ * resctrl_arch_sync_cpu_closid_rmid() - Refresh this CPU's CLOSID and RMID.
+ *					 Call via IPI.
+ * @info:	If non-NULL, a pointer to a struct resctrl_cpu_defaults
+ *		specifying the new CLOSID and RMID for tasks in the default
+ *		resctrl ctrl and mon group when running on this CPU.  If NULL,
+ *		this CPU is not re-assigned to a different default group.
+ *
+ * Propagates reassignment of CPUs and/or tasks to different resctrl groups
+ * when requested by the resctrl core code.
+ *
+ * This function records the per-cpu defaults specified by @info (if any),
+ * and then reconfigures the CPU's hardware CLOSID and RMID for subsequent
+ * execution based on @current, in the same way as during a task switch.
+ */
+void resctrl_arch_sync_cpu_closid_rmid(void *info);
+
 /**
  * resctrl_get_default_ctrl() - Return the default control value for this
  *                              resource.
-- 
Gitee


From df05dfbde8be3aa3c95c1bad46967bfb30167314 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:36:56 +0000
Subject: [PATCH 211/280] x86/resctrl: Expose resctrl fs's init function to the
 rest of the kernel

ANBZ: #31045

commit 8079565d177f5c4eac6c2ee2ac6c404eee76d500 upstream.

rdtgroup_init() needs exposing to the rest of the kernel so that arch code can
call it once it lives in core code. As this is one of the few functions
exposed, rename it to have "resctrl" in the name. The same goes for the exit
call.

Rename x86's arch code init functions for RDT to have an arch prefix to make
it clear these are part of the architecture code.

Intel-SIG: commit 8079565d177f x86/resctrl: Expose resctrl fs's init function to the rest of the kernel
Backport Resctrl/RDT-SNC for Intel platforms

Co-developed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-12-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     | 12 ++++++------
 arch/x86/kernel/cpu/resctrl/internal.h |  3 ---
 arch/x86/kernel/cpu/resctrl/monitor.c  |  2 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |  8 ++++----
 include/linux/resctrl.h                |  3 +++
 5 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index d001ca43b53d..212995149eac 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -1061,7 +1061,7 @@ void resctrl_cpu_detect(struct cpuinfo_x86 *c)
 	}
 }
 
-static int __init resctrl_late_init(void)
+static int __init resctrl_arch_late_init(void)
 {
 	struct rdt_resource *r;
 	int state, ret;
@@ -1084,7 +1084,7 @@ static int __init resctrl_late_init(void)
 	if (state < 0)
 		return state;
 
-	ret = rdtgroup_init();
+	ret = resctrl_init();
 	if (ret) {
 		cpuhp_remove_state(state);
 		return ret;
@@ -1100,18 +1100,18 @@ static int __init resctrl_late_init(void)
 	return 0;
 }
 
-late_initcall(resctrl_late_init);
+late_initcall(resctrl_arch_late_init);
 
-static void __exit resctrl_exit(void)
+static void __exit resctrl_arch_exit(void)
 {
 	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
 
 	cpuhp_remove_state(rdt_online);
 
-	rdtgroup_exit();
+	resctrl_exit();
 
 	if (r->mon_capable)
 		rdt_put_mon_l3_config();
 }
 
-__exitcall(resctrl_exit);
+__exitcall(resctrl_arch_exit);
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index f975cd6cfe61..8291f1b59981 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -328,9 +328,6 @@ extern struct list_head rdt_all_groups;
 
 extern int max_name_width;
 
-int __init rdtgroup_init(void);
-void __exit rdtgroup_exit(void);
-
 /**
  * struct rftype - describe each file in the resctrl file system
  * @name:	File name
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 58b5b21349a8..e8388d19a579 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1027,7 +1027,7 @@ static int dom_data_init(struct rdt_resource *r)
 	/*
 	 * RESCTRL_RESERVED_CLOSID and RESCTRL_RESERVED_RMID are special and
 	 * are always allocated. These are used for the rdtgroup_default
-	 * control group, which will be setup later in rdtgroup_init().
+	 * control group, which will be setup later in resctrl_init().
 	 */
 	idx = resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
 					   RESCTRL_RESERVED_RMID);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 62d9a50c7bba..b2dad689e780 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4235,14 +4235,14 @@ void resctrl_offline_cpu(unsigned int cpu)
 }
 
 /*
- * rdtgroup_init - rdtgroup initialization
+ * resctrl_init - resctrl filesystem initialization
  *
  * Setup resctrl file system including set up root, create mount point,
- * register rdtgroup filesystem, and initialize files under root directory.
+ * register resctrl filesystem, and initialize files under root directory.
  *
  * Return: 0 on success or -errno
  */
-int __init rdtgroup_init(void)
+int __init resctrl_init(void)
 {
 	int ret = 0;
 
@@ -4290,7 +4290,7 @@ int __init rdtgroup_init(void)
 	return ret;
 }
 
-void __exit rdtgroup_exit(void)
+void __exit resctrl_exit(void)
 {
 	debugfs_remove_recursive(debugfs_resctrl);
 	unregister_filesystem(&rdt_fs_type);
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 31808b3ddecb..f1979e375da9 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -402,4 +402,7 @@ void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_mon_domain *
 extern unsigned int resctrl_rmid_realloc_threshold;
 extern unsigned int resctrl_rmid_realloc_limit;
 
+int __init resctrl_init(void);
+void __exit resctrl_exit(void);
+
 #endif /* _RESCTRL_H */
-- 
Gitee


From cba926270f7492500c9e96058cf7b033edac29cd Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:36:57 +0000
Subject: [PATCH 212/280] x86/resctrl: Move rdt_find_domain() to be visible to
 arch and fs code

ANBZ: #31045

commit e3d5138cefbffa8ea1bf8aab3629268bc3381219 upstream.

rdt_find_domain() finds a domain given a resource and a cache-id.  This is
used by both the architecture code and the filesystem code.

After the filesystem code moves to live in /fs/, this helper is either
duplicated by all architectures, or needs exposing by the filesystem code.

Add the declaration to the global header file. As it's now globally visible,
and has only a handful of callers, swap the 'rdt' for 'resctrl'. Move the
function to live with its caller in ctrlmondata.c as the filesystem code will
not have anything corresponding to core.c.

Intel-SIG: commit e3d5138cefbf x86/resctrl: Move rdt_find_domain() to be visible to arch and fs code
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-13-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c        | 38 +++--------------------
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 24 +++++++++++++-
 arch/x86/kernel/cpu/resctrl/internal.h    |  2 --
 include/linux/resctrl.h                   | 14 +++++++++
 4 files changed, 41 insertions(+), 37 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 212995149eac..850cb8643c4a 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -394,36 +394,6 @@ void rdt_ctrl_update(void *arg)
 	hw_res->msr_update(m);
 }
 
-/*
- * rdt_find_domain - Search for a domain id in a resource domain list.
- *
- * Search the domain list to find the domain id. If the domain id is
- * found, return the domain. NULL otherwise.  If the domain id is not
- * found (and NULL returned) then the first domain with id bigger than
- * the input id can be returned to the caller via @pos.
- */
-struct rdt_domain_hdr *rdt_find_domain(struct list_head *h, int id,
-				       struct list_head **pos)
-{
-	struct rdt_domain_hdr *d;
-	struct list_head *l;
-
-	list_for_each(l, h) {
-		d = list_entry(l, struct rdt_domain_hdr, list);
-		/* When id is found, return its domain. */
-		if (id == d->id)
-			return d;
-		/* Stop searching when finding id's position in sorted list. */
-		if (id < d->id)
-			break;
-	}
-
-	if (pos)
-		*pos = l;
-
-	return NULL;
-}
-
 static void setup_default_ctrlval(struct rdt_resource *r, u32 *dc)
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
@@ -534,7 +504,7 @@ static void domain_add_cpu_ctrl(int cpu, struct rdt_resource *r)
 		return;
 	}
 
-	hdr = rdt_find_domain(&r->ctrl_domains, id, &add_pos);
+	hdr = resctrl_find_domain(&r->ctrl_domains, id, &add_pos);
 	if (hdr) {
 		if (WARN_ON_ONCE(hdr->type != RESCTRL_CTRL_DOMAIN))
 			return;
@@ -589,7 +559,7 @@ static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
 		return;
 	}
 
-	hdr = rdt_find_domain(&r->mon_domains, id, &add_pos);
+	hdr = resctrl_find_domain(&r->mon_domains, id, &add_pos);
 	if (hdr) {
 		if (WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN))
 			return;
@@ -654,7 +624,7 @@ static void domain_remove_cpu_ctrl(int cpu, struct rdt_resource *r)
 		return;
 	}
 
-	hdr = rdt_find_domain(&r->ctrl_domains, id, NULL);
+	hdr = resctrl_find_domain(&r->ctrl_domains, id, NULL);
 	if (!hdr) {
 		pr_warn("Can't find control domain for id=%d for CPU %d for resource %s\n",
 			id, cpu, r->name);
@@ -700,7 +670,7 @@ static void domain_remove_cpu_mon(int cpu, struct rdt_resource *r)
 		return;
 	}
 
-	hdr = rdt_find_domain(&r->mon_domains, id, NULL);
+	hdr = resctrl_find_domain(&r->mon_domains, id, NULL);
 	if (!hdr) {
 		pr_warn("Can't find monitor domain for id=%d for CPU %d for resource %s\n",
 			id, cpu, r->name);
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 5d87f279085f..763317ea2256 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -610,6 +610,28 @@ int rdtgroup_mba_mbps_event_show(struct kernfs_open_file *of,
 	return ret;
 }
 
+struct rdt_domain_hdr *resctrl_find_domain(struct list_head *h, int id,
+					   struct list_head **pos)
+{
+	struct rdt_domain_hdr *d;
+	struct list_head *l;
+
+	list_for_each(l, h) {
+		d = list_entry(l, struct rdt_domain_hdr, list);
+		/* When id is found, return its domain. */
+		if (id == d->id)
+			return d;
+		/* Stop searching when finding id's position in sorted list. */
+		if (id < d->id)
+			break;
+	}
+
+	if (pos)
+		*pos = l;
+
+	return NULL;
+}
+
 void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 		    struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
 		    cpumask_t *cpumask, int evtid, int first)
@@ -695,7 +717,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 		 * This file provides data from a single domain. Search
 		 * the resource to find the domain with "domid".
 		 */
-		hdr = rdt_find_domain(&r->mon_domains, domid, NULL);
+		hdr = resctrl_find_domain(&r->mon_domains, domid, NULL);
 		if (!hdr || WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN)) {
 			ret = -ENOENT;
 			goto out;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 8291f1b59981..da73404183da 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -581,8 +581,6 @@ void rdtgroup_kn_unlock(struct kernfs_node *kn);
 int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name);
 int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
 			     umode_t mask);
-struct rdt_domain_hdr *rdt_find_domain(struct list_head *h, int id,
-				       struct list_head **pos);
 ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 				char *buf, size_t nbytes, loff_t off);
 int rdtgroup_schemata_show(struct kernfs_open_file *of,
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index f1979e375da9..93d9a435f035 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -372,6 +372,20 @@ static inline void resctrl_arch_rmid_read_context_check(void)
 		might_sleep();
 }
 
+/**
+ * resctrl_find_domain() - Search for a domain id in a resource domain list.
+ * @h:		The domain list to search.
+ * @id:		The domain id to search for.
+ * @pos:	A pointer to position in the list id should be inserted.
+ *
+ * Search the domain list to find the domain id. If the domain id is
+ * found, return the domain. NULL otherwise.  If the domain id is not
+ * found (and NULL returned) then the first domain with id bigger than
+ * the input id can be returned to the caller via @pos.
+ */
+struct rdt_domain_hdr *resctrl_find_domain(struct list_head *h, int id,
+					   struct list_head **pos);
+
 /**
  * resctrl_arch_reset_rmid() - Reset any private state associated with rmid
  *			       and eventid.
-- 
Gitee


From 4dd65600a8d86e596e7fdda24f7a3a03589cc635 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:36:58 +0000
Subject: [PATCH 213/280] x86/resctrl: Move resctrl types to a separate header

ANBZ: #31045

commit f16adbaf9272ea7ed5d7bf8b261be8a9be949c31 upstream.

When resctrl is fully factored into core and per-arch code, each arch will
need to use some resctrl common definitions in order to define its own
specializations and helpers.  Following conventional practice, it would be
desirable to put the dependent arch definitions in an <asm/resctrl.h> header
that is included by the common <linux/resctrl.h> header.  However, this can
make it awkward to avoid a circular dependency between <linux/resctrl.h> and
the arch header.

To avoid such dependencies, move the affected common types and constants into
a new header that does not need to depend on <linux/resctrl.h> or on the arch
headers.

The same logic applies to the monitor-configuration defines, move these too.

Some kind of enumeration for events is needed between the filesystem and
architecture code. Take the x86 definition as its convenient for x86.

The definition of enum resctrl_event_id is needed to allow the architecture
code to define resctrl_arch_mon_ctx_alloc() and resctrl_arch_mon_ctx_free().

The definition of enum resctrl_res_level is needed to allow the architecture
code to define resctrl_arch_set_cdp_enabled() and
resctrl_arch_get_cdp_enabled().

The bits for mbm_local_bytes_config et al are ABI, and must be the same on all
architectures. These are documented in Documentation/arch/x86/resctrl.rst

The maintainers entry for these headers was missed when resctrl.h was created.
Add a wildcard entry to match both resctrl.h and resctrl_types.h.

Intel-SIG: commit f16adbaf9272 x86/resctrl: Move resctrl types to a separate header
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-14-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 MAINTAINERS                            |  1 +
 arch/x86/include/asm/resctrl.h         |  1 +
 arch/x86/kernel/cpu/resctrl/internal.h | 24 ------------
 include/linux/resctrl.h                | 21 +---------
 include/linux/resctrl_types.h          | 54 ++++++++++++++++++++++++++
 5 files changed, 57 insertions(+), 44 deletions(-)
 create mode 100644 include/linux/resctrl_types.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 85d4f1549af6..cde0fe482aae 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18204,6 +18204,7 @@ S:	Supported
 F:	Documentation/arch/x86/resctrl*
 F:	arch/x86/include/asm/resctrl.h
 F:	arch/x86/kernel/cpu/resctrl/
+F:	include/linux/resctrl*.h
 F:	tools/testing/selftests/resctrl/
 
 READ-COPY UPDATE (RCU)
diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 6908cd0e6e40..52f2326e2b1e 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -6,6 +6,7 @@
 
 #include <linux/jump_label.h>
 #include <linux/percpu.h>
+#include <linux/resctrl_types.h>
 #include <linux/sched.h>
 
 /*
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index da73404183da..5f3713fb2eaf 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -32,30 +32,6 @@
  */
 #define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)
 
-/* Reads to Local DRAM Memory */
-#define READS_TO_LOCAL_MEM		BIT(0)
-
-/* Reads to Remote DRAM Memory */
-#define READS_TO_REMOTE_MEM		BIT(1)
-
-/* Non-Temporal Writes to Local Memory */
-#define NON_TEMP_WRITE_TO_LOCAL_MEM	BIT(2)
-
-/* Non-Temporal Writes to Remote Memory */
-#define NON_TEMP_WRITE_TO_REMOTE_MEM	BIT(3)
-
-/* Reads to Local Memory the system identifies as "Slow Memory" */
-#define READS_TO_LOCAL_S_MEM		BIT(4)
-
-/* Reads to Remote Memory the system identifies as "Slow Memory" */
-#define READS_TO_REMOTE_S_MEM		BIT(5)
-
-/* Dirty Victims to All Types of Memory */
-#define DIRTY_VICTIMS_TO_ALL_MEM	BIT(6)
-
-/* Max event bits supported */
-#define MAX_EVT_CONFIG_BITS		GENMASK(6, 0)
-
 /**
  * cpumask_any_housekeeping() - Choose any CPU in @mask, preferring those that
  *			        aren't marked nohz_full
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 93d9a435f035..326f7ba220e7 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -6,6 +6,7 @@
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/pid.h>
+#include <linux/resctrl_types.h>
 
 /* CLOSID, RMID value used by the default control group */
 #define RESCTRL_RESERVED_CLOSID		0
@@ -37,28 +38,8 @@ enum resctrl_conf_type {
 	CDP_DATA,
 };
 
-enum resctrl_res_level {
-	RDT_RESOURCE_L3,
-	RDT_RESOURCE_L2,
-	RDT_RESOURCE_MBA,
-	RDT_RESOURCE_SMBA,
-
-	/* Must be the last */
-	RDT_NUM_RESOURCES,
-};
-
 #define CDP_NUM_TYPES	(CDP_DATA + 1)
 
-/*
- * Event IDs, the values match those used to program IA32_QM_EVTSEL before
- * reading IA32_QM_CTR on RDT systems.
- */
-enum resctrl_event_id {
-	QOS_L3_OCCUP_EVENT_ID		= 0x01,
-	QOS_L3_MBM_TOTAL_EVENT_ID	= 0x02,
-	QOS_L3_MBM_LOCAL_EVENT_ID	= 0x03,
-};
-
 /**
  * struct resctrl_staged_config - parsed configuration to be applied
  * @new_ctrl:		new ctrl value to be loaded
diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h
new file mode 100644
index 000000000000..f26450b3326b
--- /dev/null
+++ b/include/linux/resctrl_types.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2025 Arm Ltd.
+ * Based on arch/x86/kernel/cpu/resctrl/internal.h
+ */
+
+#ifndef __LINUX_RESCTRL_TYPES_H
+#define __LINUX_RESCTRL_TYPES_H
+
+/* Reads to Local DRAM Memory */
+#define READS_TO_LOCAL_MEM		BIT(0)
+
+/* Reads to Remote DRAM Memory */
+#define READS_TO_REMOTE_MEM		BIT(1)
+
+/* Non-Temporal Writes to Local Memory */
+#define NON_TEMP_WRITE_TO_LOCAL_MEM	BIT(2)
+
+/* Non-Temporal Writes to Remote Memory */
+#define NON_TEMP_WRITE_TO_REMOTE_MEM	BIT(3)
+
+/* Reads to Local Memory the system identifies as "Slow Memory" */
+#define READS_TO_LOCAL_S_MEM		BIT(4)
+
+/* Reads to Remote Memory the system identifies as "Slow Memory" */
+#define READS_TO_REMOTE_S_MEM		BIT(5)
+
+/* Dirty Victims to All Types of Memory */
+#define DIRTY_VICTIMS_TO_ALL_MEM	BIT(6)
+
+/* Max event bits supported */
+#define MAX_EVT_CONFIG_BITS		GENMASK(6, 0)
+
+enum resctrl_res_level {
+	RDT_RESOURCE_L3,
+	RDT_RESOURCE_L2,
+	RDT_RESOURCE_MBA,
+	RDT_RESOURCE_SMBA,
+
+	/* Must be the last */
+	RDT_NUM_RESOURCES,
+};
+
+/*
+ * Event IDs, the values match those used to program IA32_QM_EVTSEL before
+ * reading IA32_QM_CTR on RDT systems.
+ */
+enum resctrl_event_id {
+	QOS_L3_OCCUP_EVENT_ID		= 0x01,
+	QOS_L3_MBM_TOTAL_EVENT_ID	= 0x02,
+	QOS_L3_MBM_LOCAL_EVENT_ID	= 0x03,
+};
+
+#endif /* __LINUX_RESCTRL_TYPES_H */
-- 
Gitee


From 87d7622a1f61604e96250608f3d77d10564b7141 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:36:59 +0000
Subject: [PATCH 214/280] x86/resctrl: Add an arch helper to reset one resource

ANBZ: #31045

commit 9be68b144a5b539c8503f2944888f7a30e669291 upstream.

On umount(), resctrl resets each resource back to its default configuration.
It only ever does this for all resources in one go.

reset_all_ctrls() is architecture specific as it works with struct
rdt_hw_resource.

Make reset_all_ctrls() an arch helper that resets one resource.

Intel-SIG: commit 9be68b144a5b x86/resctrl: Add an arch helper to reset one resource
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-15-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 9 +++++----
 include/linux/resctrl.h                | 9 +++++++++
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index b2dad689e780..9eb57ebb36c6 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2867,7 +2867,7 @@ static int rdt_init_fs_context(struct fs_context *fc)
 	return 0;
 }
 
-static int reset_all_ctrls(struct rdt_resource *r)
+void resctrl_arch_reset_all_ctrls(struct rdt_resource *r)
 {
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	struct rdt_hw_ctrl_domain *hw_dom;
@@ -2896,7 +2896,7 @@ static int reset_all_ctrls(struct rdt_resource *r)
 		smp_call_function_any(&d->hdr.cpu_mask, rdt_ctrl_update, &msr_param, 1);
 	}
 
-	return 0;
+	return;
 }
 
 /*
@@ -3015,9 +3015,10 @@ static void rdt_kill_sb(struct super_block *sb)
 
 	rdt_disable_ctx();
 
-	/*Put everything back to default values. */
+	/* Put everything back to default values. */
 	for_each_alloc_capable_rdt_resource(r)
-		reset_all_ctrls(r);
+		resctrl_arch_reset_all_ctrls(r);
+
 	rmdir_all_sub();
 	rdt_pseudo_lock_release();
 	rdtgroup_default.mode = RDT_MODE_SHAREABLE;
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 326f7ba220e7..487b9657a7b5 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -394,6 +394,15 @@ void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_mon_domain *d,
  */
 void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_mon_domain *d);
 
+/**
+ * resctrl_arch_reset_all_ctrls() - Reset the control for each CLOSID to its
+ *				    default.
+ * @r:		The resctrl resource to reset.
+ *
+ * This can be called from any CPU.
+ */
+void resctrl_arch_reset_all_ctrls(struct rdt_resource *r);
+
 extern unsigned int resctrl_rmid_realloc_threshold;
 extern unsigned int resctrl_rmid_realloc_limit;
 
-- 
Gitee


From 7e276e24c2234742d604be061f21cc49595345d3 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:00 +0000
Subject: [PATCH 215/280] x86/resctrl: Move monitor exit work to a resctrl exit
 call

ANBZ: #31045

commit 011842727fa449f834c17b69d1273d88eb6e3309 upstream.

rdt_put_mon_l3_config() is called via the architecture's resctrl_arch_exit()
call, and appears to free the rmid_ptrs[] and closid_num_dirty_rmid[] arrays.
In reality this code is marked __exit, and is removed by the linker as resctrl
can't be built as a module.

To separate the filesystem and architecture parts of resctrl, this free()ing
work needs to be triggered by the filesystem, as these structures belong to
the filesystem code.

Rename rdt_put_mon_l3_config() to resctrl_mon_resource_exit() and call it from
resctrl_exit(). The kfree() is currently dependent on r->mon_capable.

Intel-SIG: commit 011842727fa4 x86/resctrl: Move monitor exit work to a resctrl exit call
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-16-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     |  5 -----
 arch/x86/kernel/cpu/resctrl/internal.h |  2 +-
 arch/x86/kernel/cpu/resctrl/monitor.c  | 12 +++++++++---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |  2 ++
 4 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 850cb8643c4a..a1577bdd3c90 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -1074,14 +1074,9 @@ late_initcall(resctrl_arch_late_init);
 
 static void __exit resctrl_arch_exit(void)
 {
-	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
-
 	cpuhp_remove_state(rdt_online);
 
 	resctrl_exit();
-
-	if (r->mon_capable)
-		rdt_put_mon_l3_config();
 }
 
 __exitcall(resctrl_arch_exit);
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 5f3713fb2eaf..73005ca2dda1 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -586,7 +586,7 @@ void closid_free(int closid);
 int alloc_rmid(u32 closid);
 void free_rmid(u32 closid, u32 rmid);
 int rdt_get_mon_l3_config(struct rdt_resource *r);
-void __exit rdt_put_mon_l3_config(void);
+void __exit resctrl_mon_resource_exit(void);
 bool __init rdt_cpu_has(int flag);
 void mon_event_count(void *info);
 int rdtgroup_mondata_show(struct seq_file *m, void *arg);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index e8388d19a579..15e8c0190bfc 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1040,10 +1040,13 @@ static int dom_data_init(struct rdt_resource *r)
 	return err;
 }
 
-static void __exit dom_data_exit(void)
+static void __exit dom_data_exit(struct rdt_resource *r)
 {
 	mutex_lock(&rdtgroup_mutex);
 
+	if (!r->mon_capable)
+		goto out_unlock;
+
 	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
 		kfree(closid_num_dirty_rmid);
 		closid_num_dirty_rmid = NULL;
@@ -1052,6 +1055,7 @@ static void __exit dom_data_exit(void)
 	kfree(rmid_ptrs);
 	rmid_ptrs = NULL;
 
+out_unlock:
 	mutex_unlock(&rdtgroup_mutex);
 }
 
@@ -1237,9 +1241,11 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 	return 0;
 }
 
-void __exit rdt_put_mon_l3_config(void)
+void __exit resctrl_mon_resource_exit(void)
 {
-	dom_data_exit();
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+
+	dom_data_exit(r);
 }
 
 void __init intel_rdt_mbm_apply_quirk(void)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 9eb57ebb36c6..42c48e79364d 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4296,4 +4296,6 @@ void __exit resctrl_exit(void)
 	debugfs_remove_recursive(debugfs_resctrl);
 	unregister_filesystem(&rdt_fs_type);
 	sysfs_remove_mount_point(fs_kobj, "resctrl");
+
+	resctrl_mon_resource_exit();
 }
-- 
Gitee


From caae0e643c693fc85a0ac0bff14648c37c550467 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:01 +0000
Subject: [PATCH 216/280] x86/resctrl: Move monitor init work to a resctrl init
 call

ANBZ: #31045

commit 4b6bdbf27fcee16944911155293771b880344ef0 upstream.

rdt_get_mon_l3_config() is called from the arch's resctrl_arch_late_init(),
and initialises both architecture specific fields, such as hw_res->mon_scale
and resctrl filesystem fields by calling dom_data_init().

To separate the filesystem and architecture parts of resctrl, this function
needs splitting up.

Add resctrl_mon_resource_init() to do the filesystem specific work, and call
it from resctrl_init(). This runs later, but is still before the filesystem is
mounted and the rmid_ptrs[] array can be used.

  [ bp: Massage commit message. ]

Intel-SIG: commit 4b6bdbf27fce x86/resctrl: Move monitor init work to a resctrl init call
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-17-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h |  3 +-
 arch/x86/kernel/cpu/resctrl/monitor.c  | 40 ++++++++++++++++++++------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 22 +++++++++++++-
 3 files changed, 54 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 73005ca2dda1..70fbb902e85e 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -586,13 +586,14 @@ void closid_free(int closid);
 int alloc_rmid(u32 closid);
 void free_rmid(u32 closid, u32 rmid);
 int rdt_get_mon_l3_config(struct rdt_resource *r);
-void __exit resctrl_mon_resource_exit(void);
+void resctrl_mon_resource_exit(void);
 bool __init rdt_cpu_has(int flag);
 void mon_event_count(void *info);
 int rdtgroup_mondata_show(struct seq_file *m, void *arg);
 void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 		    struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
 		    cpumask_t *cpumask, int evtid, int first);
+int __init resctrl_mon_resource_init(void);
 void mbm_setup_overflow_handler(struct rdt_mon_domain *dom,
 				unsigned long delay_ms,
 				int exclude_cpu);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 15e8c0190bfc..1730ba814834 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1040,7 +1040,7 @@ static int dom_data_init(struct rdt_resource *r)
 	return err;
 }
 
-static void __exit dom_data_exit(struct rdt_resource *r)
+static void dom_data_exit(struct rdt_resource *r)
 {
 	mutex_lock(&rdtgroup_mutex);
 
@@ -1176,12 +1176,40 @@ static __init int snc_get_config(void)
 	return ret;
 }
 
+/**
+ * resctrl_mon_resource_init() - Initialise global monitoring structures.
+ *
+ * Allocate and initialise global monitor resources that do not belong to a
+ * specific domain. i.e. the rmid_ptrs[] used for the limbo and free lists.
+ * Called once during boot after the struct rdt_resource's have been configured
+ * but before the filesystem is mounted.
+ * Resctrl's cpuhp callbacks may be called before this point to bring a domain
+ * online.
+ *
+ * Returns 0 for success, or -ENOMEM.
+ */
+int __init resctrl_mon_resource_init(void)
+{
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	int ret;
+
+	if (!r->mon_capable)
+		return 0;
+
+	ret = dom_data_init(r);
+	if (ret)
+		return ret;
+
+	l3_mon_evt_init(r);
+
+	return 0;
+}
+
 int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 {
 	unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	unsigned int threshold;
-	int ret;
 
 	snc_nodes_per_l3_cache = snc_get_config();
 
@@ -1211,10 +1239,6 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 	 */
 	resctrl_rmid_realloc_threshold = resctrl_arch_round_mon_val(threshold);
 
-	ret = dom_data_init(r);
-	if (ret)
-		return ret;
-
 	if (rdt_cpu_has(X86_FEATURE_BMEC)) {
 		u32 eax, ebx, ecx, edx;
 
@@ -1234,14 +1258,12 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 		}
 	}
 
-	l3_mon_evt_init(r);
-
 	r->mon_capable = true;
 
 	return 0;
 }
 
-void __exit resctrl_mon_resource_exit(void)
+void resctrl_mon_resource_exit(void)
 {
 	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
 
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 42c48e79364d..badac3f5da72 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4102,6 +4102,19 @@ void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d
 	mutex_unlock(&rdtgroup_mutex);
 }
 
+/**
+ * domain_setup_mon_state() -  Initialise domain monitoring structures.
+ * @r:	The resource for the newly online domain.
+ * @d:	The newly online domain.
+ *
+ * Allocate monitor resources that belong to this domain.
+ * Called when the first CPU of a domain comes online, regardless of whether
+ * the filesystem is mounted.
+ * During boot this may be called before global allocations have been made by
+ * resctrl_mon_resource_init().
+ *
+ * Returns 0 for success, or -ENOMEM.
+ */
 static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_mon_domain *d)
 {
 	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
@@ -4252,10 +4265,16 @@ int __init resctrl_init(void)
 
 	rdtgroup_setup_default();
 
-	ret = sysfs_create_mount_point(fs_kobj, "resctrl");
+	ret = resctrl_mon_resource_init();
 	if (ret)
 		return ret;
 
+	ret = sysfs_create_mount_point(fs_kobj, "resctrl");
+	if (ret) {
+		resctrl_mon_resource_exit();
+		return ret;
+	}
+
 	ret = register_filesystem(&rdt_fs_type);
 	if (ret)
 		goto cleanup_mountpoint;
@@ -4287,6 +4306,7 @@ int __init resctrl_init(void)
 
 cleanup_mountpoint:
 	sysfs_remove_mount_point(fs_kobj, "resctrl");
+	resctrl_mon_resource_exit();
 
 	return ret;
 }
-- 
Gitee


From 7dfd35121add989f14ee392cef137beed7740267 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:02 +0000
Subject: [PATCH 217/280] x86/resctrl: Rewrite and move the
 for_each_*_rdt_resource() walkers

ANBZ: #31045

commit 88464bff035ecb28f8bf52dd9728fdc1aca228f9 upstream.

The for_each_*_rdt_resource() helpers walk the architecture's array of
structures, using the resctrl visible part as an iterator. These became
over-complex when the structures were split into a filesystem and
architecture-specific struct. This approach avoided the need to touch every
call site, and was done before there was a helper to retrieve a resource by
rid.

Once the filesystem parts of resctrl are moved to /fs/, both the arch's
resource array, and the definition of those structures is no longer
accessible. To support resctrl, each architecture would have to provide
equally complex macros.

Rewrite the macro to make use of resctrl_arch_get_resource(), and move these
to include/linux/resctrl.h so existing x86 arch code continues to use them.

Intel-SIG: commit 88464bff035e x86/resctrl: Rewrite and move the for_each_*_rdt_resource() walkers
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-18-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h | 29 --------------------------
 include/linux/resctrl.h                | 18 ++++++++++++++++
 2 files changed, 18 insertions(+), 29 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 70fbb902e85e..82dbc1606663 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -475,14 +475,6 @@ extern struct rdtgroup rdtgroup_default;
 extern struct dentry *debugfs_resctrl;
 extern enum resctrl_event_id mba_mbps_default_event;
 
-static inline struct rdt_resource *resctrl_inc(struct rdt_resource *res)
-{
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(res);
-
-	hw_res++;
-	return &hw_res->r_resctrl;
-}
-
 static inline bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l)
 {
 	return rdt_resources_all[l].cdp_enabled;
@@ -492,27 +484,6 @@ int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
 
 void arch_mon_domain_online(struct rdt_resource *r, struct rdt_mon_domain *d);
 
-/*
- * To return the common struct rdt_resource, which is contained in struct
- * rdt_hw_resource, walk the resctrl member of struct rdt_hw_resource.
- */
-#define for_each_rdt_resource(r)					      \
-	for (r = &rdt_resources_all[0].r_resctrl;			      \
-	     r <= &rdt_resources_all[RDT_NUM_RESOURCES - 1].r_resctrl;	      \
-	     r = resctrl_inc(r))
-
-#define for_each_capable_rdt_resource(r)				      \
-	for_each_rdt_resource(r)					      \
-		if (r->alloc_capable || r->mon_capable)
-
-#define for_each_alloc_capable_rdt_resource(r)				      \
-	for_each_rdt_resource(r)					      \
-		if (r->alloc_capable)
-
-#define for_each_mon_capable_rdt_resource(r)				      \
-	for_each_rdt_resource(r)					      \
-		if (r->mon_capable)
-
 /* CPUID.(EAX=10H, ECX=ResID=1).EAX */
 union cpuid_0x10_1_eax {
 	struct {
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 487b9657a7b5..a392480dc4b6 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -26,6 +26,24 @@ int proc_resctrl_show(struct seq_file *m,
 /* max value for struct rdt_domain's mbps_val */
 #define MBA_MAX_MBPS   U32_MAX
 
+/* Walk all possible resources, with variants for only controls or monitors. */
+#define for_each_rdt_resource(_r)						\
+	for ((_r) = resctrl_arch_get_resource(0);				\
+	     (_r) && (_r)->rid < RDT_NUM_RESOURCES;				\
+	     (_r) = resctrl_arch_get_resource((_r)->rid + 1))
+
+#define for_each_capable_rdt_resource(r)				      \
+	for_each_rdt_resource((r))					      \
+		if ((r)->alloc_capable || (r)->mon_capable)
+
+#define for_each_alloc_capable_rdt_resource(r)				      \
+	for_each_rdt_resource((r))					      \
+		if ((r)->alloc_capable)
+
+#define for_each_mon_capable_rdt_resource(r)				      \
+	for_each_rdt_resource((r))					      \
+		if ((r)->mon_capable)
+
 /**
  * enum resctrl_conf_type - The type of configuration.
  * @CDP_NONE:	No prioritisation, both code and data are controlled or monitored.
-- 
Gitee


From 3aedded55e64695e43ba1e9370d8e9f08fbc1763 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:03 +0000
Subject: [PATCH 218/280] x86/resctrl: Move the is_mbm_*_enabled() helpers to
 asm/resctrl.h

ANBZ: #31045

commit d012b66a16618509242a51f5f6c9b19868ba5159 upstream.

The architecture specific parts of resctrl provide helpers like
is_mbm_total_enabled() and is_mbm_local_enabled() to hide accesses to the
rdt_mon_features bitmap.

Exposing a group of helpers between the architecture and filesystem code is
preferable to a single unsigned-long like rdt_mon_features. Helpers can be more
readable and have a well defined behaviour, while allowing architectures to hide
more complex behaviour.

Once the filesystem parts of resctrl are moved, these existing helpers can no
longer live in internal.h. Move them to include/linux/resctrl.h Once these are
exposed to the wider kernel, they should have a 'resctrl_arch_' prefix, to fit
the rest of the arch<->fs interface.

Move and rename the helpers that touch rdt_mon_features directly. is_mbm_event()
and is_mbm_enabled() are only called from rdtgroup.c, so can be moved into that
file.

Intel-SIG: commit d012b66a1661 x86/resctrl: Move the is_mbm_*_enabled() helpers to asm/resctrl.h
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-19-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h            | 16 +++++++++
 arch/x86/kernel/cpu/resctrl/core.c        |  8 ++---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  4 +--
 arch/x86/kernel/cpu/resctrl/internal.h    | 27 ---------------
 arch/x86/kernel/cpu/resctrl/monitor.c     | 16 ++++-----
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 40 +++++++++++++++--------
 6 files changed, 56 insertions(+), 55 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 52f2326e2b1e..6d4c7ea2c9e3 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -42,6 +42,7 @@ DECLARE_PER_CPU(struct resctrl_pqr_state, pqr_state);
 
 extern bool rdt_alloc_capable;
 extern bool rdt_mon_capable;
+extern unsigned int rdt_mon_features;
 
 DECLARE_STATIC_KEY_FALSE(rdt_enable_key);
 DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
@@ -81,6 +82,21 @@ static inline void resctrl_arch_disable_mon(void)
 	static_branch_dec_cpuslocked(&rdt_enable_key);
 }
 
+static inline bool resctrl_arch_is_llc_occupancy_enabled(void)
+{
+	return (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID));
+}
+
+static inline bool resctrl_arch_is_mbm_total_enabled(void)
+{
+	return (rdt_mon_features & (1 << QOS_L3_MBM_TOTAL_EVENT_ID));
+}
+
+static inline bool resctrl_arch_is_mbm_local_enabled(void)
+{
+	return (rdt_mon_features & (1 << QOS_L3_MBM_LOCAL_EVENT_ID));
+}
+
 /*
  * __resctrl_sched_in() - Writes the task's CLOSid/RMID to IA32_PQR_MSR
  *
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index a1577bdd3c90..eba210db4a7b 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -453,13 +453,13 @@ static int arch_domain_mbm_alloc(u32 num_rmid, struct rdt_hw_mon_domain *hw_dom)
 {
 	size_t tsize;
 
-	if (is_mbm_total_enabled()) {
+	if (resctrl_arch_is_mbm_total_enabled()) {
 		tsize = sizeof(*hw_dom->arch_mbm_total);
 		hw_dom->arch_mbm_total = kcalloc(num_rmid, tsize, GFP_KERNEL);
 		if (!hw_dom->arch_mbm_total)
 			return -ENOMEM;
 	}
-	if (is_mbm_local_enabled()) {
+	if (resctrl_arch_is_mbm_local_enabled()) {
 		tsize = sizeof(*hw_dom->arch_mbm_local);
 		hw_dom->arch_mbm_local = kcalloc(num_rmid, tsize, GFP_KERNEL);
 		if (!hw_dom->arch_mbm_local) {
@@ -908,9 +908,9 @@ static __init bool get_rdt_mon_resources(void)
 	if (!rdt_mon_features)
 		return false;
 
-	if (is_mbm_local_enabled())
+	if (resctrl_arch_is_mbm_local_enabled())
 		mba_mbps_default_event = QOS_L3_MBM_LOCAL_EVENT_ID;
-	else if (is_mbm_total_enabled())
+	else if (resctrl_arch_is_mbm_total_enabled())
 		mba_mbps_default_event = QOS_L3_MBM_TOTAL_EVENT_ID;
 
 	return !rdt_get_mon_l3_config(r);
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 763317ea2256..1ecc93282b7d 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -559,12 +559,12 @@ ssize_t rdtgroup_mba_mbps_event_write(struct kernfs_open_file *of,
 	rdt_last_cmd_clear();
 
 	if (!strcmp(buf, "mbm_local_bytes")) {
-		if (is_mbm_local_enabled())
+		if (resctrl_arch_is_mbm_local_enabled())
 			rdtgrp->mba_mbps_event = QOS_L3_MBM_LOCAL_EVENT_ID;
 		else
 			ret = -EINVAL;
 	} else if (!strcmp(buf, "mbm_total_bytes")) {
-		if (is_mbm_total_enabled())
+		if (resctrl_arch_is_mbm_total_enabled())
 			rdtgrp->mba_mbps_event = QOS_L3_MBM_TOTAL_EVENT_ID;
 		else
 			ret = -EINVAL;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 82dbc1606663..4a5996d1e060 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -156,7 +156,6 @@ struct rmid_read {
 	void			*arch_mon_ctx;
 };
 
-extern unsigned int rdt_mon_features;
 extern struct list_head resctrl_schema_all;
 extern bool resctrl_mounted;
 
@@ -406,32 +405,6 @@ struct msr_param {
 	u32			high;
 };
 
-static inline bool is_llc_occupancy_enabled(void)
-{
-	return (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID));
-}
-
-static inline bool is_mbm_total_enabled(void)
-{
-	return (rdt_mon_features & (1 << QOS_L3_MBM_TOTAL_EVENT_ID));
-}
-
-static inline bool is_mbm_local_enabled(void)
-{
-	return (rdt_mon_features & (1 << QOS_L3_MBM_LOCAL_EVENT_ID));
-}
-
-static inline bool is_mbm_enabled(void)
-{
-	return (is_mbm_total_enabled() || is_mbm_local_enabled());
-}
-
-static inline bool is_mbm_event(int e)
-{
-	return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
-		e <= QOS_L3_MBM_LOCAL_EVENT_ID);
-}
-
 /**
  * struct rdt_hw_resource - arch private attributes of a resctrl resource
  * @r_resctrl:		Attributes of the resource used directly by resctrl.
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 1730ba814834..d883ed56ec90 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -295,11 +295,11 @@ void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_mon_domain *
 {
 	struct rdt_hw_mon_domain *hw_dom = resctrl_to_arch_mon_dom(d);
 
-	if (is_mbm_total_enabled())
+	if (resctrl_arch_is_mbm_total_enabled())
 		memset(hw_dom->arch_mbm_total, 0,
 		       sizeof(*hw_dom->arch_mbm_total) * r->num_rmid);
 
-	if (is_mbm_local_enabled())
+	if (resctrl_arch_is_mbm_local_enabled())
 		memset(hw_dom->arch_mbm_local, 0,
 		       sizeof(*hw_dom->arch_mbm_local) * r->num_rmid);
 }
@@ -569,7 +569,7 @@ void free_rmid(u32 closid, u32 rmid)
 
 	entry = __rmid_entry(idx);
 
-	if (is_llc_occupancy_enabled())
+	if (resctrl_arch_is_llc_occupancy_enabled())
 		add_rmid_to_limbo(entry);
 	else
 		list_add_tail(&entry->list, &rmid_free_lru);
@@ -852,10 +852,10 @@ static void mbm_update(struct rdt_resource *r, struct rdt_mon_domain *d,
 	 * This is protected from concurrent reads from user as both
 	 * the user and overflow handler hold the global mutex.
 	 */
-	if (is_mbm_total_enabled())
+	if (resctrl_arch_is_mbm_total_enabled())
 		mbm_update_one_event(r, d, closid, rmid, QOS_L3_MBM_TOTAL_EVENT_ID);
 
-	if (is_mbm_local_enabled())
+	if (resctrl_arch_is_mbm_local_enabled())
 		mbm_update_one_event(r, d, closid, rmid, QOS_L3_MBM_LOCAL_EVENT_ID);
 }
 
@@ -1085,11 +1085,11 @@ static void l3_mon_evt_init(struct rdt_resource *r)
 {
 	INIT_LIST_HEAD(&r->evt_list);
 
-	if (is_llc_occupancy_enabled())
+	if (resctrl_arch_is_llc_occupancy_enabled())
 		list_add_tail(&llc_occupancy_event.list, &r->evt_list);
-	if (is_mbm_total_enabled())
+	if (resctrl_arch_is_mbm_total_enabled())
 		list_add_tail(&mbm_total_event.list, &r->evt_list);
-	if (is_mbm_local_enabled())
+	if (resctrl_arch_is_mbm_local_enabled())
 		list_add_tail(&mbm_local_event.list, &r->evt_list);
 }
 
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index badac3f5da72..eb32fbc3abea 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -117,6 +117,18 @@ void rdt_staged_configs_clear(void)
 	}
 }
 
+static bool resctrl_is_mbm_enabled(void)
+{
+	return (resctrl_arch_is_mbm_total_enabled() ||
+		resctrl_arch_is_mbm_local_enabled());
+}
+
+static bool resctrl_is_mbm_event(int e)
+{
+	return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
+		e <= QOS_L3_MBM_LOCAL_EVENT_ID);
+}
+
 /*
  * Trivial allocator for CLOSIDs. Since h/w only supports a small number,
  * we can keep a bitmap of free CLOSIDs in a single integer.
@@ -164,7 +176,7 @@ static int closid_alloc(void)
 	lockdep_assert_held(&rdtgroup_mutex);
 
 	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID) &&
-	    is_llc_occupancy_enabled()) {
+	    resctrl_arch_is_llc_occupancy_enabled()) {
 		cleanest_closid = resctrl_find_cleanest_closid();
 		if (cleanest_closid < 0)
 			return cleanest_closid;
@@ -2378,7 +2390,7 @@ static bool supports_mba_mbps(void)
 	struct rdt_resource *rmbm = resctrl_arch_get_resource(RDT_RESOURCE_L3);
 	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
 
-	return (is_mbm_enabled() &&
+	return (resctrl_is_mbm_enabled() &&
 		r->alloc_capable && is_mba_linear() &&
 		r->ctrl_scope == rmbm->mon_scope);
 }
@@ -2756,7 +2768,7 @@ static int rdt_get_tree(struct fs_context *fc)
 	if (resctrl_arch_alloc_capable() || resctrl_arch_mon_capable())
 		resctrl_mounted = true;
 
-	if (is_mbm_enabled()) {
+	if (resctrl_is_mbm_enabled()) {
 		r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
 		list_for_each_entry(dom, &r->mon_domains, hdr.list)
 			mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL,
@@ -3125,7 +3137,7 @@ static int mon_add_all_files(struct kernfs_node *kn, struct rdt_mon_domain *d,
 		if (ret)
 			return ret;
 
-		if (!do_sum && is_mbm_event(mevt->evtid))
+		if (!do_sum && resctrl_is_mbm_event(mevt->evtid))
 			mon_event_read(&rr, r, d, prgrp, &d->hdr.cpu_mask, mevt->evtid, true);
 	}
 
@@ -4082,9 +4094,9 @@ void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d
 	if (resctrl_mounted && resctrl_arch_mon_capable())
 		rmdir_mondata_subdir_allrdtgrp(r, d);
 
-	if (is_mbm_enabled())
+	if (resctrl_is_mbm_enabled())
 		cancel_delayed_work(&d->mbm_over);
-	if (is_llc_occupancy_enabled() && has_busy_rmid(d)) {
+	if (resctrl_arch_is_llc_occupancy_enabled() && has_busy_rmid(d)) {
 		/*
 		 * When a package is going down, forcefully
 		 * decrement rmid->ebusy. There is no way to know
@@ -4120,12 +4132,12 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_mon_domain
 	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
 	size_t tsize;
 
-	if (is_llc_occupancy_enabled()) {
+	if (resctrl_arch_is_llc_occupancy_enabled()) {
 		d->rmid_busy_llc = bitmap_zalloc(idx_limit, GFP_KERNEL);
 		if (!d->rmid_busy_llc)
 			return -ENOMEM;
 	}
-	if (is_mbm_total_enabled()) {
+	if (resctrl_arch_is_mbm_total_enabled()) {
 		tsize = sizeof(*d->mbm_total);
 		d->mbm_total = kcalloc(idx_limit, tsize, GFP_KERNEL);
 		if (!d->mbm_total) {
@@ -4133,7 +4145,7 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_mon_domain
 			return -ENOMEM;
 		}
 	}
-	if (is_mbm_local_enabled()) {
+	if (resctrl_arch_is_mbm_local_enabled()) {
 		tsize = sizeof(*d->mbm_local);
 		d->mbm_local = kcalloc(idx_limit, tsize, GFP_KERNEL);
 		if (!d->mbm_local) {
@@ -4172,13 +4184,13 @@ int resctrl_online_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d)
 	if (err)
 		goto out_unlock;
 
-	if (is_mbm_enabled()) {
+	if (resctrl_is_mbm_enabled()) {
 		INIT_DELAYED_WORK(&d->mbm_over, mbm_handle_overflow);
 		mbm_setup_overflow_handler(d, MBM_OVERFLOW_INTERVAL,
 					   RESCTRL_PICK_ANY_CPU);
 	}
 
-	if (is_llc_occupancy_enabled())
+	if (resctrl_arch_is_llc_occupancy_enabled())
 		INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo);
 
 	/*
@@ -4233,12 +4245,12 @@ void resctrl_offline_cpu(unsigned int cpu)
 
 	d = get_mon_domain_from_cpu(cpu, l3);
 	if (d) {
-		if (is_mbm_enabled() && cpu == d->mbm_work_cpu) {
+		if (resctrl_is_mbm_enabled() && cpu == d->mbm_work_cpu) {
 			cancel_delayed_work(&d->mbm_over);
 			mbm_setup_overflow_handler(d, 0, cpu);
 		}
-		if (is_llc_occupancy_enabled() && cpu == d->cqm_work_cpu &&
-		    has_busy_rmid(d)) {
+		if (resctrl_arch_is_llc_occupancy_enabled() &&
+		    cpu == d->cqm_work_cpu && has_busy_rmid(d)) {
 			cancel_delayed_work(&d->cqm_limbo);
 			cqm_setup_limbo_handler(d, 0, cpu);
 		}
-- 
Gitee


From 1838f66bc438205e8395508c6dd36baec3e9f9b8 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:04 +0000
Subject: [PATCH 219/280] x86/resctrl: Add resctrl_arch_is_evt_configurable()
 to abstract BMEC

ANBZ: #31045

commit d81826f87a80a86cc5963ff3c44f05700ded3fc9 upstream.

When BMEC is supported the resctrl event can be configured in a number of
ways. This depends on architecture support. rdt_get_mon_l3_config() modifies
the struct mon_evt and calls resctrl_file_fflags_init() to create the files
that allow the configuration.

Splitting this into separate architecture and filesystem parts would require
the struct mon_evt and resctrl_file_fflags_init() to be exposed.

Instead, add resctrl_arch_is_evt_configurable(), and use this from
resctrl_mon_resource_init() to initialise struct mon_evt and call
resctrl_file_fflags_init().

resctrl_arch_is_evt_configurable() calls rdt_cpu_has() so it doesn't obviously
benefit from being inlined. Putting it in core.c will allow rdt_cpu_has() to
eventually become static.

Intel-SIG: commit d81826f87a80 x86/resctrl: Add resctrl_arch_is_evt_configurable() to abstract BMEC
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-20-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c    | 15 +++++++++++++++
 arch/x86/kernel/cpu/resctrl/monitor.c | 22 +++++++++++-----------
 include/linux/resctrl.h               |  2 ++
 3 files changed, 28 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index eba210db4a7b..6f0d1bbba901 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -830,6 +830,21 @@ bool __init rdt_cpu_has(int flag)
 	return ret;
 }
 
+__init bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt)
+{
+	if (!rdt_cpu_has(X86_FEATURE_BMEC))
+		return false;
+
+	switch (evt) {
+	case QOS_L3_MBM_TOTAL_EVENT_ID:
+		return rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL);
+	case QOS_L3_MBM_LOCAL_EVENT_ID:
+		return rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL);
+	default:
+		return false;
+	}
+}
+
 static __init bool get_mem_config(void)
 {
 	struct rdt_hw_resource *hw_res = &rdt_resources_all[RDT_RESOURCE_MBA];
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index d883ed56ec90..27d983121b0a 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1202,6 +1202,17 @@ int __init resctrl_mon_resource_init(void)
 
 	l3_mon_evt_init(r);
 
+	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_TOTAL_EVENT_ID)) {
+		mbm_total_event.configurable = true;
+		resctrl_file_fflags_init("mbm_total_bytes_config",
+					 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
+	}
+	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_LOCAL_EVENT_ID)) {
+		mbm_local_event.configurable = true;
+		resctrl_file_fflags_init("mbm_local_bytes_config",
+					 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
+	}
+
 	return 0;
 }
 
@@ -1245,17 +1256,6 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 		/* Detect list of bandwidth sources that can be tracked */
 		cpuid_count(0x80000020, 3, &eax, &ebx, &ecx, &edx);
 		hw_res->mbm_cfg_mask = ecx & MAX_EVT_CONFIG_BITS;
-
-		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL)) {
-			mbm_total_event.configurable = true;
-			resctrl_file_fflags_init("mbm_total_bytes_config",
-						 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
-		}
-		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL)) {
-			mbm_local_event.configurable = true;
-			resctrl_file_fflags_init("mbm_local_bytes_config",
-						 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
-		}
 	}
 
 	r->mon_capable = true;
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index a392480dc4b6..cc76f308e6f3 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -309,6 +309,8 @@ u32 resctrl_arch_get_num_closid(struct rdt_resource *r);
 u32 resctrl_arch_system_num_rmid_idx(void);
 int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid);
 
+__init bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt);
+
 /*
  * Update the ctrl_val and apply this config right now.
  * Must be called on one of the domain's CPUs.
-- 
Gitee


From b9b07e847e49b3ae9c9e7560a6854906a3393e29 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:05 +0000
Subject: [PATCH 220/280] x86/resctrl: Change mon_event_config_{read,write}()
 to be arch helpers

ANBZ: #31045

commit 650680d651aaf409f097ad904c3fea6c4b3a0884 upstream.

mon_event_config_{read,write}() are called via IPI and access model specific
registers to do their work.

To support another architecture, this needs abstracting.

Rename mon_event_config_{read,write}() to have a "resctrl_arch_" prefix, and
move their struct mon_config_info parameter into <linux/resctrl.h>.  This
allows another architecture to supply an implementation of these.

As struct mon_config_info is now exposed globally, give it a 'resctrl_'
prefix. MPAM systems need access to the domain to do this work, add the
resource and domain to struct resctrl_mon_config_info.

Intel-SIG: commit 650680d651aa x86/resctrl: Change mon_event_config_{read,write}() to be arch helpers
Backport Resctrl/RDT-SNC for Intel platforms

Co-developed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-21-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 46 +++++++++++++-------------
 include/linux/resctrl.h                | 31 +++++++++++++++++
 2 files changed, 54 insertions(+), 23 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index eb32fbc3abea..e7d1d8b6983d 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1580,11 +1580,6 @@ static int rdtgroup_size_show(struct kernfs_open_file *of,
 	return ret;
 }
 
-struct mon_config_info {
-	u32 evtid;
-	u32 mon_config;
-};
-
 #define INVALID_CONFIG_INDEX   UINT_MAX
 
 /**
@@ -1609,31 +1604,32 @@ static inline unsigned int mon_event_config_index_get(u32 evtid)
 	}
 }
 
-static void mon_event_config_read(void *info)
+void resctrl_arch_mon_event_config_read(void *_config_info)
 {
-	struct mon_config_info *mon_info = info;
+	struct resctrl_mon_config_info *config_info = _config_info;
 	unsigned int index;
 	u64 msrval;
 
-	index = mon_event_config_index_get(mon_info->evtid);
+	index = mon_event_config_index_get(config_info->evtid);
 	if (index == INVALID_CONFIG_INDEX) {
-		pr_warn_once("Invalid event id %d\n", mon_info->evtid);
+		pr_warn_once("Invalid event id %d\n", config_info->evtid);
 		return;
 	}
 	rdmsrl(MSR_IA32_EVT_CFG_BASE + index, msrval);
 
 	/* Report only the valid event configuration bits */
-	mon_info->mon_config = msrval & MAX_EVT_CONFIG_BITS;
+	config_info->mon_config = msrval & MAX_EVT_CONFIG_BITS;
 }
 
-static void mondata_config_read(struct rdt_mon_domain *d, struct mon_config_info *mon_info)
+static void mondata_config_read(struct resctrl_mon_config_info *mon_info)
 {
-	smp_call_function_any(&d->hdr.cpu_mask, mon_event_config_read, mon_info, 1);
+	smp_call_function_any(&mon_info->d->hdr.cpu_mask,
+			      resctrl_arch_mon_event_config_read, mon_info, 1);
 }
 
 static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid)
 {
-	struct mon_config_info mon_info;
+	struct resctrl_mon_config_info mon_info;
 	struct rdt_mon_domain *dom;
 	bool sep = false;
 
@@ -1644,9 +1640,11 @@ static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid
 		if (sep)
 			seq_puts(s, ";");
 
-		memset(&mon_info, 0, sizeof(struct mon_config_info));
+		memset(&mon_info, 0, sizeof(struct resctrl_mon_config_info));
+		mon_info.r = r;
+		mon_info.d = dom;
 		mon_info.evtid = evtid;
-		mondata_config_read(dom, &mon_info);
+		mondata_config_read(&mon_info);
 
 		seq_printf(s, "%d=0x%02x", dom->hdr.id, mon_info.mon_config);
 		sep = true;
@@ -1679,30 +1677,32 @@ static int mbm_local_bytes_config_show(struct kernfs_open_file *of,
 	return 0;
 }
 
-static void mon_event_config_write(void *info)
+void resctrl_arch_mon_event_config_write(void *_config_info)
 {
-	struct mon_config_info *mon_info = info;
+	struct resctrl_mon_config_info *config_info = _config_info;
 	unsigned int index;
 
-	index = mon_event_config_index_get(mon_info->evtid);
+	index = mon_event_config_index_get(config_info->evtid);
 	if (index == INVALID_CONFIG_INDEX) {
-		pr_warn_once("Invalid event id %d\n", mon_info->evtid);
+		pr_warn_once("Invalid event id %d\n", config_info->evtid);
 		return;
 	}
-	wrmsr(MSR_IA32_EVT_CFG_BASE + index, mon_info->mon_config, 0);
+	wrmsr(MSR_IA32_EVT_CFG_BASE + index, config_info->mon_config, 0);
 }
 
 static void mbm_config_write_domain(struct rdt_resource *r,
 				    struct rdt_mon_domain *d, u32 evtid, u32 val)
 {
-	struct mon_config_info mon_info = {0};
+	struct resctrl_mon_config_info mon_info = {0};
 
 	/*
 	 * Read the current config value first. If both are the same then
 	 * no need to write it again.
 	 */
+	mon_info.r = r;
+	mon_info.d = d;
 	mon_info.evtid = evtid;
-	mondata_config_read(d, &mon_info);
+	mondata_config_read(&mon_info);
 	if (mon_info.mon_config == val)
 		return;
 
@@ -1714,7 +1714,7 @@ static void mbm_config_write_domain(struct rdt_resource *r,
 	 * are scoped at the domain level. Writing any of these MSRs
 	 * on one CPU is observed by all the CPUs in the domain.
 	 */
-	smp_call_function_any(&d->hdr.cpu_mask, mon_event_config_write,
+	smp_call_function_any(&d->hdr.cpu_mask, resctrl_arch_mon_event_config_write,
 			      &mon_info, 1);
 
 	/*
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index cc76f308e6f3..90b6563cf532 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -270,6 +270,13 @@ struct resctrl_cpu_defaults {
 	u32 rmid;
 };
 
+struct resctrl_mon_config_info {
+	struct rdt_resource	*r;
+	struct rdt_mon_domain	*d;
+	u32			evtid;
+	u32			mon_config;
+};
+
 /**
  * resctrl_arch_sync_cpu_closid_rmid() - Refresh this CPU's CLOSID and RMID.
  *					 Call via IPI.
@@ -311,6 +318,30 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid);
 
 __init bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt);
 
+/**
+ * resctrl_arch_mon_event_config_write() - Write the config for an event.
+ * @config_info: struct resctrl_mon_config_info describing the resource, domain
+ *		 and event.
+ *
+ * Reads resource, domain and eventid from @config_info and writes the
+ * event config_info->mon_config into hardware.
+ *
+ * Called via IPI to reach a CPU that is a member of the specified domain.
+ */
+void resctrl_arch_mon_event_config_write(void *config_info);
+
+/**
+ * resctrl_arch_mon_event_config_read() - Read the config for an event.
+ * @config_info: struct resctrl_mon_config_info describing the resource, domain
+ *		 and event.
+ *
+ * Reads resource, domain and eventid from @config_info and reads the
+ * hardware config value into config_info->mon_config.
+ *
+ * Called via IPI to reach a CPU that is a member of the specified domain.
+ */
+void resctrl_arch_mon_event_config_read(void *config_info);
+
 /*
  * Update the ctrl_val and apply this config right now.
  * Must be called on one of the domain's CPUs.
-- 
Gitee


From b0c2bc471de71d08786578eae5b1ee4a00cc21e4 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:06 +0000
Subject: [PATCH 221/280] x86/resctrl: Move mba_mbps_default_event init to
 filesystem code

ANBZ: #31045

commit 37bae1756734b065f5e5cddc54ad121ff0c8db51 upstream.

mba_mbps_default_event is initialised based on whether mbm_local or mbm_total
is supported. In the case of both, it is initialised to mbm_local.
mba_mbps_default_event is initialised in core.c's get_rdt_mon_resources(),
while all the readers are in rdtgroup.c.

After this code is split into architecture-specific and filesystem code,
get_rdt_mon_resources() remains part of the architecture code, which would
mean mba_mbps_default_event has to be exposed by the filesystem code.

Move the initialisation to the filesystem's resctrl_mon_resource_init().

Intel-SIG: commit 37bae1756734 x86/resctrl: Move mba_mbps_default_event init to filesystem code
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-22-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c    | 5 -----
 arch/x86/kernel/cpu/resctrl/monitor.c | 5 +++++
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 6f0d1bbba901..b9b74f53b8ee 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -923,11 +923,6 @@ static __init bool get_rdt_mon_resources(void)
 	if (!rdt_mon_features)
 		return false;
 
-	if (resctrl_arch_is_mbm_local_enabled())
-		mba_mbps_default_event = QOS_L3_MBM_LOCAL_EVENT_ID;
-	else if (resctrl_arch_is_mbm_total_enabled())
-		mba_mbps_default_event = QOS_L3_MBM_TOTAL_EVENT_ID;
-
 	return !rdt_get_mon_l3_config(r);
 }
 
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 27d983121b0a..306b06ba32db 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1213,6 +1213,11 @@ int __init resctrl_mon_resource_init(void)
 					 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
 	}
 
+	if (resctrl_arch_is_mbm_local_enabled())
+		mba_mbps_default_event = QOS_L3_MBM_LOCAL_EVENT_ID;
+	else if (resctrl_arch_is_mbm_total_enabled())
+		mba_mbps_default_event = QOS_L3_MBM_TOTAL_EVENT_ID;
+
 	return 0;
 }
 
-- 
Gitee


From 5e02da2abe7ba381bbc708b85d8ccd86502f7c71 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:07 +0000
Subject: [PATCH 222/280] x86/resctrl: Move mbm_cfg_mask to struct rdt_resource

ANBZ: #31045

commit c32a7d7777800b61a5c9272cc94fe21aa919b305 upstream.

The mbm_cfg_mask field lists the bits that user-space can set when configuring
an event. This value is output via the last_cmd_status file.

Once the filesystem parts of resctrl are moved to live in /fs/, the struct
rdt_hw_resource is inaccessible to the filesystem code. Because this value is
output to user-space, it has to be accessible to the filesystem code.

Move it to struct rdt_resource.

Intel-SIG: commit c32a7d777780 x86/resctrl: Move mbm_cfg_mask to struct rdt_resource
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-23-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h | 3 ---
 arch/x86/kernel/cpu/resctrl/monitor.c  | 2 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 5 ++---
 include/linux/resctrl.h                | 3 +++
 4 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 4a5996d1e060..725f223ea07b 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -417,8 +417,6 @@ struct msr_param {
  * @msr_update:		Function pointer to update QOS MSRs
  * @mon_scale:		cqm counter * mon_scale = occupancy in bytes
  * @mbm_width:		Monitor width, to detect and correct for overflow.
- * @mbm_cfg_mask:	Bandwidth sources that can be tracked when Bandwidth
- *			Monitoring Event Configuration (BMEC) is supported.
  * @cdp_enabled:	CDP state of this resource
  *
  * Members of this structure are either private to the architecture
@@ -432,7 +430,6 @@ struct rdt_hw_resource {
 	void			(*msr_update)(struct msr_param *m);
 	unsigned int		mon_scale;
 	unsigned int		mbm_width;
-	unsigned int		mbm_cfg_mask;
 	bool			cdp_enabled;
 };
 
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 306b06ba32db..83f90128d768 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1260,7 +1260,7 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 
 		/* Detect list of bandwidth sources that can be tracked */
 		cpuid_count(0x80000020, 3, &eax, &ebx, &ecx, &edx);
-		hw_res->mbm_cfg_mask = ecx & MAX_EVT_CONFIG_BITS;
+		r->mbm_cfg_mask = ecx & MAX_EVT_CONFIG_BITS;
 	}
 
 	r->mon_capable = true;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index e7d1d8b6983d..a388ef66ef4c 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1731,7 +1731,6 @@ static void mbm_config_write_domain(struct rdt_resource *r,
 
 static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
 {
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 	char *dom_str = NULL, *id_str;
 	unsigned long dom_id, val;
 	struct rdt_mon_domain *d;
@@ -1758,9 +1757,9 @@ static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
 	}
 
 	/* Value from user cannot be more than the supported set of events */
-	if ((val & hw_res->mbm_cfg_mask) != val) {
+	if ((val & r->mbm_cfg_mask) != val) {
 		rdt_last_cmd_printf("Invalid event configuration: max valid mask is 0x%02x\n",
-				    hw_res->mbm_cfg_mask);
+				    r->mbm_cfg_mask);
 		return -EINVAL;
 	}
 
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 90b6563cf532..914df24ffe48 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -217,6 +217,8 @@ enum resctrl_schema_fmt {
  * @name:		Name to use in "schemata" file.
  * @schema_fmt:		Which format string and parser is used for this schema.
  * @evt_list:		List of monitoring events
+ * @mbm_cfg_mask:	Bandwidth sources that can be tracked when bandwidth
+ *			monitoring events can be configured.
  * @cdp_capable:	Is the CDP feature available on this resource
  */
 struct rdt_resource {
@@ -233,6 +235,7 @@ struct rdt_resource {
 	char			*name;
 	enum resctrl_schema_fmt	schema_fmt;
 	struct list_head	evt_list;
+	unsigned int		mbm_cfg_mask;
 	bool			cdp_capable;
 };
 
-- 
Gitee


From 97f5c66a1bc8fa833ca4e296550088fd1dd9337a Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:08 +0000
Subject: [PATCH 223/280] x86/resctrl: Add resctrl_arch_ prefix to pseudo lock
 functions

ANBZ: #31045

commit 7d0ec14c64a107a548616deace93a1913e5d68ed upstream.

resctrl's pseudo lock has some copy-to-cache and measurement functions that
are micro-architecture specific.

For example, pseudo_lock_fn() is not at all portable.

Label these 'resctrl_arch_' so they stay under /arch/x86.  To expose these
functions to the filesystem code they need an entry in a header file, and
can't be marked static.

Intel-SIG: commit 7d0ec14c64a1 x86/resctrl: Add resctrl_arch_ prefix to pseudo lock functions
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-24-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h            |  5 ++++
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 36 ++++++++++++-----------
 2 files changed, 24 insertions(+), 17 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 6d4c7ea2c9e3..86407dbde583 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -203,6 +203,11 @@ static inline void *resctrl_arch_mon_ctx_alloc(struct rdt_resource *r, int evtid
 static inline void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid,
 					     void *ctx) { };
 
+u64 resctrl_arch_get_prefetch_disable_bits(void);
+int resctrl_arch_pseudo_lock_fn(void *_rdtgrp);
+int resctrl_arch_measure_cycles_lat_fn(void *_plr);
+int resctrl_arch_measure_l2_residency(void *_plr);
+int resctrl_arch_measure_l3_residency(void *_plr);
 void resctrl_cpu_detect(struct cpuinfo_x86 *c);
 
 #else
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index ae1f0c28eee6..de4a6387eaaf 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -61,7 +61,8 @@ static const struct class pseudo_lock_class = {
 };
 
 /**
- * get_prefetch_disable_bits - prefetch disable bits of supported platforms
+ * resctrl_arch_get_prefetch_disable_bits - prefetch disable bits of supported
+ *                                          platforms
  * @void: It takes no parameters.
  *
  * Capture the list of platforms that have been validated to support
@@ -75,13 +76,13 @@ static const struct class pseudo_lock_class = {
  * in the SDM.
  *
  * When adding a platform here also add support for its cache events to
- * measure_cycles_perf_fn()
+ * resctrl_arch_measure_l*_residency()
  *
  * Return:
  * If platform is supported, the bits to disable hardware prefetchers, 0
  * if platform is not supported.
  */
-static u64 get_prefetch_disable_bits(void)
+u64 resctrl_arch_get_prefetch_disable_bits(void)
 {
 	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL ||
 	    boot_cpu_data.x86 != 6)
@@ -408,7 +409,7 @@ static void pseudo_lock_free(struct rdtgroup *rdtgrp)
 }
 
 /**
- * pseudo_lock_fn - Load kernel memory into cache
+ * resctrl_arch_pseudo_lock_fn - Load kernel memory into cache
  * @_rdtgrp: resource group to which pseudo-lock region belongs
  *
  * This is the core pseudo-locking flow.
@@ -426,7 +427,7 @@ static void pseudo_lock_free(struct rdtgroup *rdtgrp)
  *
  * Return: 0. Waiter on waitqueue will be woken on completion.
  */
-static int pseudo_lock_fn(void *_rdtgrp)
+int resctrl_arch_pseudo_lock_fn(void *_rdtgrp)
 {
 	struct rdtgroup *rdtgrp = _rdtgrp;
 	struct pseudo_lock_region *plr = rdtgrp->plr;
@@ -712,7 +713,7 @@ int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
 	 * Not knowing the bits to disable prefetching implies that this
 	 * platform does not support Cache Pseudo-Locking.
 	 */
-	prefetch_disable_bits = get_prefetch_disable_bits();
+	prefetch_disable_bits = resctrl_arch_get_prefetch_disable_bits();
 	if (prefetch_disable_bits == 0) {
 		rdt_last_cmd_puts("Pseudo-locking not supported\n");
 		return -EINVAL;
@@ -872,7 +873,8 @@ bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_ctrl_domain *d)
 }
 
 /**
- * measure_cycles_lat_fn - Measure cycle latency to read pseudo-locked memory
+ * resctrl_arch_measure_cycles_lat_fn - Measure cycle latency to read
+ *                                      pseudo-locked memory
  * @_plr: pseudo-lock region to measure
  *
  * There is no deterministic way to test if a memory region is cached. One
@@ -885,7 +887,7 @@ bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_ctrl_domain *d)
  *
  * Return: 0. Waiter on waitqueue will be woken on completion.
  */
-static int measure_cycles_lat_fn(void *_plr)
+int resctrl_arch_measure_cycles_lat_fn(void *_plr)
 {
 	struct pseudo_lock_region *plr = _plr;
 	u32 saved_low, saved_high;
@@ -1069,7 +1071,7 @@ static int measure_residency_fn(struct perf_event_attr *miss_attr,
 	return 0;
 }
 
-static int measure_l2_residency(void *_plr)
+int resctrl_arch_measure_l2_residency(void *_plr)
 {
 	struct pseudo_lock_region *plr = _plr;
 	struct residency_counts counts = {0};
@@ -1107,7 +1109,7 @@ static int measure_l2_residency(void *_plr)
 	return 0;
 }
 
-static int measure_l3_residency(void *_plr)
+int resctrl_arch_measure_l3_residency(void *_plr)
 {
 	struct pseudo_lock_region *plr = _plr;
 	struct residency_counts counts = {0};
@@ -1205,14 +1207,14 @@ static int pseudo_lock_measure_cycles(struct rdtgroup *rdtgrp, int sel)
 	plr->cpu = cpu;
 
 	if (sel == 1)
-		thread = kthread_run_on_cpu(measure_cycles_lat_fn, plr,
-					    cpu, "pseudo_lock_measure/%u");
+		thread = kthread_run_on_cpu(resctrl_arch_measure_cycles_lat_fn,
+					    plr, cpu, "pseudo_lock_measure/%u");
 	else if (sel == 2)
-		thread = kthread_run_on_cpu(measure_l2_residency, plr,
-					    cpu, "pseudo_lock_measure/%u");
+		thread = kthread_run_on_cpu(resctrl_arch_measure_l2_residency,
+					    plr, cpu, "pseudo_lock_measure/%u");
 	else if (sel == 3)
-		thread = kthread_run_on_cpu(measure_l3_residency, plr,
-					    cpu, "pseudo_lock_measure/%u");
+		thread = kthread_run_on_cpu(resctrl_arch_measure_l3_residency,
+					    plr, cpu, "pseudo_lock_measure/%u");
 	else
 		goto out;
 
@@ -1307,7 +1309,7 @@ int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
 
 	plr->thread_done = 0;
 
-	thread = kthread_run_on_cpu(pseudo_lock_fn, rdtgrp,
+	thread = kthread_run_on_cpu(resctrl_arch_pseudo_lock_fn, rdtgrp,
 				    plr->cpu, "pseudo_lock/%u");
 	if (IS_ERR(thread)) {
 		ret = PTR_ERR(thread);
-- 
Gitee


From 564fe2d2aefd45661263d7d469396e33e257f5c6 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:09 +0000
Subject: [PATCH 224/280] x86/resctrl: Allow an architecture to disable pseudo
 lock

ANBZ: #31045

commit 7028840552a220ac5efe51a4b554195cd954a912 upstream.

Pseudo-lock relies on knowledge of the micro-architecture to disable
prefetchers etc.

On arm64 these controls are typically secure only, meaning Linux can't access
them. Arm's cache-lockdown feature works in a very different way. Resctrl's
pseudo-lock isn't going to be used on arm64 platforms.

Add a Kconfig symbol that can be selected by the architecture. This enables or
disables building of the pseudo_lock.c file, and replaces the functions with
stubs. An additional IS_ENABLED() check is needed in rdtgroup_mode_write() so
that attempting to enable pseudo-lock reports an "Unknown or unsupported mode"
to user-space via the last_cmd_status file.

Intel-SIG: commit 7028840552a2 x86/resctrl: Allow an architecture to disable pseudo lock
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-25-james.morse@arm.com

 Conflicts:
	arch/x86/Kconfig
[jz: resolve context conflict]
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/Kconfig                       |  7 ++++
 arch/x86/kernel/cpu/resctrl/Makefile   |  5 +--
 arch/x86/kernel/cpu/resctrl/internal.h | 49 +++++++++++++++++++++-----
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |  3 +-
 4 files changed, 53 insertions(+), 11 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 890c59602fc0..ac2e95c097c3 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -494,6 +494,7 @@ config X86_CPU_RESCTRL
 	depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD)
 	select KERNFS
 	select PROC_CPU_RESCTRL		if PROC_FS
+	select RESCTRL_FS_PSEUDO_LOCK
 	help
 	  Enable x86 CPU resource control support.
 
@@ -510,6 +511,12 @@ config X86_CPU_RESCTRL
 
 	  Say N if unsure.
 
+config RESCTRL_FS_PSEUDO_LOCK
+	bool
+	help
+	  Software mechanism to pin data in a cache portion using
+	  micro-architecture specific knowledge.
+
 if X86_32
 config X86_BIGSMP
 	bool "Support for big SMP systems with more than 8 CPUs"
diff --git a/arch/x86/kernel/cpu/resctrl/Makefile b/arch/x86/kernel/cpu/resctrl/Makefile
index 4a06c37b9cf1..0c13b0befd8a 100644
--- a/arch/x86/kernel/cpu/resctrl/Makefile
+++ b/arch/x86/kernel/cpu/resctrl/Makefile
@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_X86_CPU_RESCTRL)	+= core.o rdtgroup.o monitor.o
-obj-$(CONFIG_X86_CPU_RESCTRL)	+= ctrlmondata.o pseudo_lock.o
+obj-$(CONFIG_X86_CPU_RESCTRL)		+= core.o rdtgroup.o monitor.o
+obj-$(CONFIG_X86_CPU_RESCTRL)		+= ctrlmondata.o
+obj-$(CONFIG_RESCTRL_FS_PSEUDO_LOCK)	+= pseudo_lock.o
 CFLAGS_pseudo_lock.o = -I$(src)
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 725f223ea07b..8d35bb423aad 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -512,14 +512,6 @@ unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_ctrl_domain
 				  unsigned long cbm);
 enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
 int rdtgroup_tasks_assigned(struct rdtgroup *r);
-int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
-int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp);
-bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_ctrl_domain *d, unsigned long cbm);
-bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_ctrl_domain *d);
-int rdt_pseudo_lock_init(void);
-void rdt_pseudo_lock_release(void);
-int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
-void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
 struct rdt_ctrl_domain *get_ctrl_domain_from_cpu(int cpu, struct rdt_resource *r);
 struct rdt_mon_domain *get_mon_domain_from_cpu(int cpu, struct rdt_resource *r);
 int closids_supported(void);
@@ -551,4 +543,45 @@ void resctrl_file_fflags_init(const char *config, unsigned long fflags);
 void rdt_staged_configs_clear(void);
 bool closid_allocated(unsigned int closid);
 int resctrl_find_cleanest_closid(void);
+
+#ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
+int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
+int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp);
+bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_ctrl_domain *d, unsigned long cbm);
+bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_ctrl_domain *d);
+int rdt_pseudo_lock_init(void);
+void rdt_pseudo_lock_release(void);
+int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
+void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
+#else
+static inline int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_ctrl_domain *d, unsigned long cbm)
+{
+	return false;
+}
+
+static inline bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_ctrl_domain *d)
+{
+	return false;
+}
+
+static inline int rdt_pseudo_lock_init(void) { return 0; }
+static inline void rdt_pseudo_lock_release(void) { }
+static inline int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp) { }
+#endif /* CONFIG_RESCTRL_FS_PSEUDO_LOCK */
+
 #endif /* _ASM_X86_RESCTRL_INTERNAL_H */
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index a388ef66ef4c..e59271515a46 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1453,7 +1453,8 @@ static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
 				goto out;
 		}
 		rdtgrp->mode = RDT_MODE_EXCLUSIVE;
-	} else if (!strcmp(buf, "pseudo-locksetup")) {
+	} else if (IS_ENABLED(CONFIG_RESCTRL_FS_PSEUDO_LOCK) &&
+		   !strcmp(buf, "pseudo-locksetup")) {
 		ret = rdtgroup_locksetup_enter(rdtgrp);
 		if (ret)
 			goto out;
-- 
Gitee


From 7ba4411a9ce5581f9c003e9ec15d4aee07b4da30 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:10 +0000
Subject: [PATCH 225/280] x86/resctrl: Make prefetch_disable_bits belong to the
 arch code

ANBZ: #31045

commit 4d20f38ab6d922dd6b8a33795b6e72516d733eb2 upstream.

prefetch_disable_bits is set by rdtgroup_locksetup_enter() from a value
provided by the architecture, but is largely read by other architecture
helpers.

Make resctrl_arch_get_prefetch_disable_bits() set prefetch_disable_bits so
that it can be isolated to arch-code from where the other arch-code helpers
can use its cached value.

Intel-SIG: commit 4d20f38ab6d9 x86/resctrl: Make prefetch_disable_bits belong to the arch code
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-26-james.morse@arm.com

 Conflicts:
	arch/x86/kernel/cpu/resctrl/pseudo_lock.c
[jz: resolve context conflict]
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index de4a6387eaaf..ba5f5fd147ae 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -84,6 +84,8 @@ static const struct class pseudo_lock_class = {
  */
 u64 resctrl_arch_get_prefetch_disable_bits(void)
 {
+	prefetch_disable_bits = 0;
+
 	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL ||
 	    boot_cpu_data.x86 != 6)
 		return 0;
@@ -99,7 +101,8 @@ u64 resctrl_arch_get_prefetch_disable_bits(void)
 		 * 3    DCU IP Prefetcher Disable (R/W)
 		 * 63:4 Reserved
 		 */
-		return 0xF;
+		prefetch_disable_bits = 0xF;
+		break;
 	case INTEL_ATOM_GOLDMONT:
 	case INTEL_ATOM_GOLDMONT_PLUS:
 		/*
@@ -110,10 +113,11 @@ u64 resctrl_arch_get_prefetch_disable_bits(void)
 		 * 2     DCU Hardware Prefetcher Disable (R/W)
 		 * 63:3  Reserved
 		 */
-		return 0x5;
+		prefetch_disable_bits = 0x5;
+		break;
 	}
 
-	return 0;
+	return prefetch_disable_bits;
 }
 
 /**
@@ -713,8 +717,7 @@ int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
 	 * Not knowing the bits to disable prefetching implies that this
 	 * platform does not support Cache Pseudo-Locking.
 	 */
-	prefetch_disable_bits = resctrl_arch_get_prefetch_disable_bits();
-	if (prefetch_disable_bits == 0) {
+	if (resctrl_arch_get_prefetch_disable_bits() == 0) {
 		rdt_last_cmd_puts("Pseudo-locking not supported\n");
 		return -EINVAL;
 	}
-- 
Gitee


From a307a1608cea04b8d7242d92d24bb23cb7719d5f Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:11 +0000
Subject: [PATCH 226/280] x86/resctrl: Make resctrl_arch_pseudo_lock_fn() take
 a plr

ANBZ: #31045

commit 4cf9acfc8f1a322576f0666b882d631cfdf714bf upstream.

resctrl_arch_pseudo_lock_fn() has architecture specific behaviour,
and takes a struct rdtgroup as an argument.

After the filesystem code moves to /fs/, the definition of struct
rdtgroup will not be available to the architecture code.

The only reason resctrl_arch_pseudo_lock_fn() wants the rdtgroup is
for the CLOSID. Embed that in the pseudo_lock_region as a closid,
and move the definition of struct pseudo_lock_region to resctrl.h.

Intel-SIG: commit 4cf9acfc8f1a x86/resctrl: Make resctrl_arch_pseudo_lock_fn() take a plr
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-27-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h            |  2 +-
 arch/x86/kernel/cpu/resctrl/internal.h    | 37 ---------------------
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 12 +++----
 include/linux/resctrl.h                   | 39 +++++++++++++++++++++++
 4 files changed, 46 insertions(+), 44 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 86407dbde583..011bf67a1866 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -204,7 +204,7 @@ static inline void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid,
 					     void *ctx) { };
 
 u64 resctrl_arch_get_prefetch_disable_bits(void);
-int resctrl_arch_pseudo_lock_fn(void *_rdtgrp);
+int resctrl_arch_pseudo_lock_fn(void *_plr);
 int resctrl_arch_measure_cycles_lat_fn(void *_plr);
 int resctrl_arch_measure_l2_residency(void *_plr);
 int resctrl_arch_measure_l3_residency(void *_plr);
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 8d35bb423aad..0d13006e920b 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -208,43 +208,6 @@ struct mongroup {
 	u32			rmid;
 };
 
-/**
- * struct pseudo_lock_region - pseudo-lock region information
- * @s:			Resctrl schema for the resource to which this
- *			pseudo-locked region belongs
- * @d:			RDT domain to which this pseudo-locked region
- *			belongs
- * @cbm:		bitmask of the pseudo-locked region
- * @lock_thread_wq:	waitqueue used to wait on the pseudo-locking thread
- *			completion
- * @thread_done:	variable used by waitqueue to test if pseudo-locking
- *			thread completed
- * @cpu:		core associated with the cache on which the setup code
- *			will be run
- * @line_size:		size of the cache lines
- * @size:		size of pseudo-locked region in bytes
- * @kmem:		the kernel memory associated with pseudo-locked region
- * @minor:		minor number of character device associated with this
- *			region
- * @debugfs_dir:	pointer to this region's directory in the debugfs
- *			filesystem
- * @pm_reqs:		Power management QoS requests related to this region
- */
-struct pseudo_lock_region {
-	struct resctrl_schema	*s;
-	struct rdt_ctrl_domain	*d;
-	u32			cbm;
-	wait_queue_head_t	lock_thread_wq;
-	int			thread_done;
-	int			cpu;
-	unsigned int		line_size;
-	unsigned int		size;
-	void			*kmem;
-	unsigned int		minor;
-	struct dentry		*debugfs_dir;
-	struct list_head	pm_reqs;
-};
-
 /**
  * struct rdtgroup - store rdtgroup's data in resctrl file system.
  * @kn:				kernfs node
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index ba5f5fd147ae..bee3038a634d 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -414,7 +414,7 @@ static void pseudo_lock_free(struct rdtgroup *rdtgrp)
 
 /**
  * resctrl_arch_pseudo_lock_fn - Load kernel memory into cache
- * @_rdtgrp: resource group to which pseudo-lock region belongs
+ * @_plr: the pseudo-lock region descriptor
  *
  * This is the core pseudo-locking flow.
  *
@@ -431,10 +431,9 @@ static void pseudo_lock_free(struct rdtgroup *rdtgrp)
  *
  * Return: 0. Waiter on waitqueue will be woken on completion.
  */
-int resctrl_arch_pseudo_lock_fn(void *_rdtgrp)
+int resctrl_arch_pseudo_lock_fn(void *_plr)
 {
-	struct rdtgroup *rdtgrp = _rdtgrp;
-	struct pseudo_lock_region *plr = rdtgrp->plr;
+	struct pseudo_lock_region *plr = _plr;
 	u32 rmid_p, closid_p;
 	unsigned long i;
 	u64 saved_msr;
@@ -494,7 +493,8 @@ int resctrl_arch_pseudo_lock_fn(void *_rdtgrp)
 	 * pseudo-locked followed by reading of kernel memory to load it
 	 * into the cache.
 	 */
-	__wrmsr(MSR_IA32_PQR_ASSOC, rmid_p, rdtgrp->closid);
+	__wrmsr(MSR_IA32_PQR_ASSOC, rmid_p, plr->closid);
+
 	/*
 	 * Cache was flushed earlier. Now access kernel memory to read it
 	 * into cache region associated with just activated plr->closid.
@@ -1312,7 +1312,7 @@ int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
 
 	plr->thread_done = 0;
 
-	thread = kthread_run_on_cpu(resctrl_arch_pseudo_lock_fn, rdtgrp,
+	thread = kthread_run_on_cpu(resctrl_arch_pseudo_lock_fn, plr,
 				    plr->cpu, "pseudo_lock/%u");
 	if (IS_ERR(thread)) {
 		ret = PTR_ERR(thread);
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 914df24ffe48..226cc5c0d765 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -58,6 +58,45 @@ enum resctrl_conf_type {
 
 #define CDP_NUM_TYPES	(CDP_DATA + 1)
 
+/*
+ * struct pseudo_lock_region - pseudo-lock region information
+ * @s:			Resctrl schema for the resource to which this
+ *			pseudo-locked region belongs
+ * @closid:		The closid that this pseudo-locked region uses
+ * @d:			RDT domain to which this pseudo-locked region
+ *			belongs
+ * @cbm:		bitmask of the pseudo-locked region
+ * @lock_thread_wq:	waitqueue used to wait on the pseudo-locking thread
+ *			completion
+ * @thread_done:	variable used by waitqueue to test if pseudo-locking
+ *			thread completed
+ * @cpu:		core associated with the cache on which the setup code
+ *			will be run
+ * @line_size:		size of the cache lines
+ * @size:		size of pseudo-locked region in bytes
+ * @kmem:		the kernel memory associated with pseudo-locked region
+ * @minor:		minor number of character device associated with this
+ *			region
+ * @debugfs_dir:	pointer to this region's directory in the debugfs
+ *			filesystem
+ * @pm_reqs:		Power management QoS requests related to this region
+ */
+struct pseudo_lock_region {
+	struct resctrl_schema	*s;
+	u32			closid;
+	struct rdt_ctrl_domain	*d;
+	u32			cbm;
+	wait_queue_head_t	lock_thread_wq;
+	int			thread_done;
+	int			cpu;
+	unsigned int		line_size;
+	unsigned int		size;
+	void			*kmem;
+	unsigned int		minor;
+	struct dentry		*debugfs_dir;
+	struct list_head	pm_reqs;
+};
+
 /**
  * struct resctrl_staged_config - parsed configuration to be applied
  * @new_ctrl:		new ctrl value to be loaded
-- 
Gitee


From d14c8588026903b082048b563b140ceca1fe439c Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:12 +0000
Subject: [PATCH 227/280] x86/resctrl: Move RFTYPE flags to be managed by
 resctrl

ANBZ: #31045

commit 373af4ecfdc922657be081b3feebbd0af8e7fa65 upstream.

resctrl_file_fflags_init() is called from the architecture specific code to
make the 'thread_throttle_mode' file visible. The architecture specific code
has already set the membw.throttle_mode in the rdt_resource.

This forces the RFTYPE flags used by resctrl to be exposed to the architecture
specific code.

This doesn't need to be specific to the architecture, the throttle_mode can be
used by resctrl to determine if the 'thread_throttle_mode' file should be
visible. This allows the RFTYPE flags to be private to resctrl.

Add thread_throttle_mode_init(), and use it to call resctrl_file_fflags_init()
from resctrl_init(). This avoids publishing an extra function between the
architecture and filesystem code.

Intel-SIG: commit 373af4ecfdc9 x86/resctrl: Move RFTYPE flags to be managed by resctrl
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-28-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     |  3 ---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 12 ++++++++++++
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index b9b74f53b8ee..e590dd347fa7 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -227,9 +227,6 @@ static __init bool __get_mem_config_intel(struct rdt_resource *r)
 	else
 		r->membw.throttle_mode = THREAD_THROTTLE_MAX;
 
-	resctrl_file_fflags_init("thread_throttle_mode",
-				 RFTYPE_CTRL_INFO | RFTYPE_RES_MB);
-
 	r->alloc_capable = true;
 
 	return true;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index e59271515a46..58feba3feefd 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2064,6 +2064,16 @@ static struct rftype *rdtgroup_get_rftype_by_name(const char *name)
 	return NULL;
 }
 
+static void thread_throttle_mode_init(void)
+{
+	struct rdt_resource *r_mba;
+
+	r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+	if (r_mba->membw.throttle_mode != THREAD_THROTTLE_UNDEFINED)
+		resctrl_file_fflags_init("thread_throttle_mode",
+					 RFTYPE_CTRL_INFO | RFTYPE_RES_MB);
+}
+
 void resctrl_file_fflags_init(const char *config, unsigned long fflags)
 {
 	struct rftype *rft;
@@ -4277,6 +4287,8 @@ int __init resctrl_init(void)
 
 	rdtgroup_setup_default();
 
+	thread_throttle_mode_init();
+
 	ret = resctrl_mon_resource_init();
 	if (ret)
 		return ret;
-- 
Gitee


From 95d531744f3f6f07f32edc183fd8ad03b552b81c Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:13 +0000
Subject: [PATCH 228/280] x86/resctrl: Handle throttle_mode for SMBA resources

ANBZ: #31045

commit 6c2282d42cb37f081587412f77340138b1df265e upstream.

Now that the visibility of throttle_mode is being managed by resctrl, it
should consider resources other than MBA that may have a throttle_mode.  SMBA
is one such resource.

Extend thread_throttle_mode_init() to check SMBA for a throttle_mode.

Adding support for multiple resources means it is possible for a platform with
both MBA and SMBA, but an undefined throttle_mode on one of them to make the
file visible.

Add the 'undefined' case to rdt_thread_throttle_mode_show().

Intel-SIG: commit 6c2282d42cb3 x86/resctrl: Handle throttle_mode for SMBA resources
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-29-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 33 +++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 58feba3feefd..5fc60c9ce28f 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1188,10 +1188,19 @@ static int rdt_thread_throttle_mode_show(struct kernfs_open_file *of,
 	struct resctrl_schema *s = of->kn->parent->priv;
 	struct rdt_resource *r = s->res;
 
-	if (r->membw.throttle_mode == THREAD_THROTTLE_PER_THREAD)
+	switch (r->membw.throttle_mode) {
+	case THREAD_THROTTLE_PER_THREAD:
 		seq_puts(seq, "per-thread\n");
-	else
+		return 0;
+	case THREAD_THROTTLE_MAX:
 		seq_puts(seq, "max\n");
+		return 0;
+	case THREAD_THROTTLE_UNDEFINED:
+		seq_puts(seq, "undefined\n");
+		return 0;
+	}
+
+	WARN_ON_ONCE(1);
 
 	return 0;
 }
@@ -2066,12 +2075,24 @@ static struct rftype *rdtgroup_get_rftype_by_name(const char *name)
 
 static void thread_throttle_mode_init(void)
 {
-	struct rdt_resource *r_mba;
+	enum membw_throttle_mode throttle_mode = THREAD_THROTTLE_UNDEFINED;
+	struct rdt_resource *r_mba, *r_smba;
 
 	r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-	if (r_mba->membw.throttle_mode != THREAD_THROTTLE_UNDEFINED)
-		resctrl_file_fflags_init("thread_throttle_mode",
-					 RFTYPE_CTRL_INFO | RFTYPE_RES_MB);
+	if (r_mba->alloc_capable &&
+	    r_mba->membw.throttle_mode != THREAD_THROTTLE_UNDEFINED)
+		throttle_mode = r_mba->membw.throttle_mode;
+
+	r_smba = resctrl_arch_get_resource(RDT_RESOURCE_SMBA);
+	if (r_smba->alloc_capable &&
+	    r_smba->membw.throttle_mode != THREAD_THROTTLE_UNDEFINED)
+		throttle_mode = r_smba->membw.throttle_mode;
+
+	if (throttle_mode == THREAD_THROTTLE_UNDEFINED)
+		return;
+
+	resctrl_file_fflags_init("thread_throttle_mode",
+				 RFTYPE_CTRL_INFO | RFTYPE_RES_MB);
 }
 
 void resctrl_file_fflags_init(const char *config, unsigned long fflags)
-- 
Gitee


From bfb7bdf7cd555a300009091fa86b2449bf1fc20a Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:14 +0000
Subject: [PATCH 229/280] x86/resctrl: Move get_config_index() to a header

ANBZ: #31045

commit f62b4e45e0b467cba75ae816338b996c6dc4dafa upstream.

get_config_index() is used by the architecture specific code to map
a CLOSID+type pair to an index in the configuration arrays.

MPAM needs to do this too to preserve the ABI to user-space, there is no
reason to do it differently.

Move the helper to a header file to allow all architectures that either
use or emulate CDP to use the same pattern of CLOSID values. Moving
this to a header file means it must be marked inline, which matches
the existing compiler choice for this static function.

Intel-SIG: commit f62b4e45e0b4 x86/resctrl: Move get_config_index() to a header
Backport Resctrl/RDT-SNC for Intel platforms

Co-developed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-30-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 19 +++----------------
 include/linux/resctrl.h                   | 15 +++++++++++++++
 2 files changed, 18 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 1ecc93282b7d..0a0ac5f6112e 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -287,25 +287,12 @@ static int parse_line(char *line, struct resctrl_schema *s,
 	return -EINVAL;
 }
 
-static u32 get_config_index(u32 closid, enum resctrl_conf_type type)
-{
-	switch (type) {
-	default:
-	case CDP_NONE:
-		return closid;
-	case CDP_CODE:
-		return closid * 2 + 1;
-	case CDP_DATA:
-		return closid * 2;
-	}
-}
-
 int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_ctrl_domain *d,
 			    u32 closid, enum resctrl_conf_type t, u32 cfg_val)
 {
 	struct rdt_hw_ctrl_domain *hw_dom = resctrl_to_arch_ctrl_dom(d);
 	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-	u32 idx = get_config_index(closid, t);
+	u32 idx = resctrl_get_config_index(closid, t);
 	struct msr_param msr_param;
 
 	if (!cpumask_test_cpu(smp_processor_id(), &d->hdr.cpu_mask))
@@ -342,7 +329,7 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 			if (!cfg->have_new_ctrl)
 				continue;
 
-			idx = get_config_index(closid, t);
+			idx = resctrl_get_config_index(closid, t);
 			if (cfg->new_ctrl == hw_dom->ctrl_val[idx])
 				continue;
 			hw_dom->ctrl_val[idx] = cfg->new_ctrl;
@@ -462,7 +449,7 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_ctrl_domain *d,
 			    u32 closid, enum resctrl_conf_type type)
 {
 	struct rdt_hw_ctrl_domain *hw_dom = resctrl_to_arch_ctrl_dom(d);
-	u32 idx = get_config_index(closid, type);
+	u32 idx = resctrl_get_config_index(closid, type);
 
 	return hw_dom->ctrl_val[idx];
 }
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 226cc5c0d765..880351ca3dfc 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -384,6 +384,21 @@ void resctrl_arch_mon_event_config_write(void *config_info);
  */
 void resctrl_arch_mon_event_config_read(void *config_info);
 
+/* For use by arch code to remap resctrl's smaller CDP CLOSID range */
+static inline u32 resctrl_get_config_index(u32 closid,
+					   enum resctrl_conf_type type)
+{
+	switch (type) {
+	default:
+	case CDP_NONE:
+		return closid;
+	case CDP_CODE:
+		return closid * 2 + 1;
+	case CDP_DATA:
+		return closid * 2;
+	}
+}
+
 /*
  * Update the ctrl_val and apply this config right now.
  * Must be called on one of the domain's CPUs.
-- 
Gitee


From 0ffd9446424a19ff46c3d6e2f6472d630d14380a Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Tue, 11 Mar 2025 18:37:15 +0000
Subject: [PATCH 230/280] x86/resctrl: Move get_{mon,ctrl}_domain_from_cpu() to
 live with their callers

ANBZ: #31045

commit 823beb31e55673bf2fd21374e095eec73a761ee7 upstream.

Each of get_{mon,ctrl}_domain_from_cpu() only has one caller.

Once the filesystem code is moved to /fs/, there is no equivalent to
core.c.

Move these functions to each live next to their caller. This allows
them to be made static and the header file entries to be removed.

Intel-SIG: commit 823beb31e556 x86/resctrl: Move get_{mon,ctrl}_domain_from_cpu() to live with their callers
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20250311183715.16445-31-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     | 30 --------------------------
 arch/x86/kernel/cpu/resctrl/internal.h |  2 --
 arch/x86/kernel/cpu/resctrl/monitor.c  | 16 ++++++++++++++
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 16 ++++++++++++++
 4 files changed, 32 insertions(+), 32 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index e590dd347fa7..cf29681d01e0 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -347,36 +347,6 @@ static void cat_wrmsr(struct msr_param *m)
 		wrmsrl(hw_res->msr_base + i, hw_dom->ctrl_val[i]);
 }
 
-struct rdt_ctrl_domain *get_ctrl_domain_from_cpu(int cpu, struct rdt_resource *r)
-{
-	struct rdt_ctrl_domain *d;
-
-	lockdep_assert_cpus_held();
-
-	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
-		/* Find the domain that contains this CPU */
-		if (cpumask_test_cpu(cpu, &d->hdr.cpu_mask))
-			return d;
-	}
-
-	return NULL;
-}
-
-struct rdt_mon_domain *get_mon_domain_from_cpu(int cpu, struct rdt_resource *r)
-{
-	struct rdt_mon_domain *d;
-
-	lockdep_assert_cpus_held();
-
-	list_for_each_entry(d, &r->mon_domains, hdr.list) {
-		/* Find the domain that contains this CPU */
-		if (cpumask_test_cpu(cpu, &d->hdr.cpu_mask))
-			return d;
-	}
-
-	return NULL;
-}
-
 u32 resctrl_arch_get_num_closid(struct rdt_resource *r)
 {
 	return resctrl_to_arch_res(r)->num_closid;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 0d13006e920b..c44c5b496355 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -475,8 +475,6 @@ unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_ctrl_domain
 				  unsigned long cbm);
 enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
 int rdtgroup_tasks_assigned(struct rdtgroup *r);
-struct rdt_ctrl_domain *get_ctrl_domain_from_cpu(int cpu, struct rdt_resource *r);
-struct rdt_mon_domain *get_mon_domain_from_cpu(int cpu, struct rdt_resource *r);
 int closids_supported(void);
 void closid_free(int closid);
 int alloc_rmid(u32 closid);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 83f90128d768..a93ed7d2a160 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -718,6 +718,22 @@ void mon_event_count(void *info)
 		rr->err = 0;
 }
 
+static struct rdt_ctrl_domain *get_ctrl_domain_from_cpu(int cpu,
+							struct rdt_resource *r)
+{
+	struct rdt_ctrl_domain *d;
+
+	lockdep_assert_cpus_held();
+
+	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
+		/* Find the domain that contains this CPU */
+		if (cpumask_test_cpu(cpu, &d->hdr.cpu_mask))
+			return d;
+	}
+
+	return NULL;
+}
+
 /*
  * Feedback loop for MBA software controller (mba_sc)
  *
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 5fc60c9ce28f..c6274d40b217 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4257,6 +4257,22 @@ static void clear_childcpus(struct rdtgroup *r, unsigned int cpu)
 	}
 }
 
+static struct rdt_mon_domain *get_mon_domain_from_cpu(int cpu,
+						      struct rdt_resource *r)
+{
+	struct rdt_mon_domain *d;
+
+	lockdep_assert_cpus_held();
+
+	list_for_each_entry(d, &r->mon_domains, hdr.list) {
+		/* Find the domain that contains this CPU */
+		if (cpumask_test_cpu(cpu, &d->hdr.cpu_mask))
+			return d;
+	}
+
+	return NULL;
+}
+
 void resctrl_offline_cpu(unsigned int cpu)
 {
 	struct rdt_resource *l3 = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-- 
Gitee


From 1cb58b2ae778f504feb134cae62e40a2505c8612 Mon Sep 17 00:00:00 2001
From: Randy Dunlap <rdunlap@infradead.org>
Date: Mon, 31 Jul 2023 22:08:17 -0700
Subject: [PATCH 231/280] cpumask: kernel-doc cleanups and additions

ANBZ: #31045

commit 57f728d59f005dffdbb52a03531e480a71599bc5 upstream.

Clean up some punctutation and abbreviations.
Add kernel-doc notation for one function and function return value
for 39 functions.

cpumask.h:
Fix some punctuation (plural vs. possessive).
Fix some abbreviations (ie. -> i.e., id -> ID).

Fix 35 warnings like this:
include/linux/cpumask.h:161: warning: No description found for return value of 'cpumask_first'

cpumask.c:
Add Return: value for 4 functions.
Add kernel-doc for cpumask_any_distribute().

Intel-SIG: commit 57f728d59f00 cpumask: kernel-doc cleanups and additions
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>

 Conflicts:
	include/linux/cpumask.h
[jz: cpumask_any_and_but() already backported]
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/cpumask.h | 111 ++++++++++++++++++++++++----------------
 lib/cpumask.c           |  17 ++++--
 2 files changed, 80 insertions(+), 48 deletions(-)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index cb4850e09e43..95d9b2e7c2b0 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -4,7 +4,7 @@
 
 /*
  * Cpumasks provide a bitmap suitable for representing the
- * set of CPU's in a system, one bit position per CPU number.  In general,
+ * set of CPUs in a system, one bit position per CPU number.  In general,
  * only nr_cpu_ids (<= NR_CPUS) bits are valid.
  */
 #include <linux/kernel.h>
@@ -97,7 +97,7 @@ static inline void set_nr_cpu_ids(unsigned int nr)
  *
  *  If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
  *
- *  The cpu_possible_mask is fixed at boot time, as the set of CPU id's
+ *  The cpu_possible_mask is fixed at boot time, as the set of CPU IDs
  *  that it is possible might ever be plugged in at anytime during the
  *  life of that system boot.  The cpu_present_mask is dynamic(*),
  *  representing which CPUs are currently plugged in.  And
@@ -112,7 +112,7 @@ static inline void set_nr_cpu_ids(unsigned int nr)
  *      hotplug, it's a copy of cpu_possible_mask, hence fixed at boot.
  *
  * Subtleties:
- * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
+ * 1) UP ARCHes (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
  *    assumption that their single CPU is online.  The UP
  *    cpu_{online,possible,present}_masks are placebos.  Changing them
  *    will have no useful affect on the following num_*_cpus()
@@ -155,7 +155,7 @@ static __always_inline unsigned int cpumask_check(unsigned int cpu)
  * cpumask_first - get the first cpu in a cpumask
  * @srcp: the cpumask pointer
  *
- * Returns >= nr_cpu_ids if no cpus set.
+ * Return: >= nr_cpu_ids if no cpus set.
  */
 static inline unsigned int cpumask_first(const struct cpumask *srcp)
 {
@@ -166,7 +166,7 @@ static inline unsigned int cpumask_first(const struct cpumask *srcp)
  * cpumask_first_zero - get the first unset cpu in a cpumask
  * @srcp: the cpumask pointer
  *
- * Returns >= nr_cpu_ids if all cpus are set.
+ * Return: >= nr_cpu_ids if all cpus are set.
  */
 static inline unsigned int cpumask_first_zero(const struct cpumask *srcp)
 {
@@ -178,7 +178,7 @@ static inline unsigned int cpumask_first_zero(const struct cpumask *srcp)
  * @srcp1: the first input
  * @srcp2: the second input
  *
- * Returns >= nr_cpu_ids if no cpus set in both.  See also cpumask_next_and().
+ * Return: >= nr_cpu_ids if no cpus set in both.  See also cpumask_next_and().
  */
 static inline
 unsigned int cpumask_first_and(const struct cpumask *srcp1, const struct cpumask *srcp2)
@@ -207,7 +207,7 @@ unsigned int cpumask_first_and_and(const struct cpumask *srcp1,
  * cpumask_last - get the last CPU in a cpumask
  * @srcp:	- the cpumask pointer
  *
- * Returns	>= nr_cpumask_bits if no CPUs set.
+ * Return:	>= nr_cpumask_bits if no CPUs set.
  */
 static inline unsigned int cpumask_last(const struct cpumask *srcp)
 {
@@ -216,10 +216,10 @@ static inline unsigned int cpumask_last(const struct cpumask *srcp)
 
 /**
  * cpumask_next - get the next cpu in a cpumask
- * @n: the cpu prior to the place to search (ie. return will be > @n)
+ * @n: the cpu prior to the place to search (i.e. return will be > @n)
  * @srcp: the cpumask pointer
  *
- * Returns >= nr_cpu_ids if no further cpus set.
+ * Return: >= nr_cpu_ids if no further cpus set.
  */
 static inline
 unsigned int cpumask_next(int n, const struct cpumask *srcp)
@@ -232,10 +232,10 @@ unsigned int cpumask_next(int n, const struct cpumask *srcp)
 
 /**
  * cpumask_next_zero - get the next unset cpu in a cpumask
- * @n: the cpu prior to the place to search (ie. return will be > @n)
+ * @n: the cpu prior to the place to search (i.e. return will be > @n)
  * @srcp: the cpumask pointer
  *
- * Returns >= nr_cpu_ids if no further cpus unset.
+ * Return: >= nr_cpu_ids if no further cpus unset.
  */
 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
 {
@@ -271,11 +271,11 @@ unsigned int cpumask_any_distribute(const struct cpumask *srcp);
 
 /**
  * cpumask_next_and - get the next cpu in *src1p & *src2p
- * @n: the cpu prior to the place to search (ie. return will be > @n)
+ * @n: the cpu prior to the place to search (i.e. return will be > @n)
  * @src1p: the first cpumask pointer
  * @src2p: the second cpumask pointer
  *
- * Returns >= nr_cpu_ids if no further cpus set in both.
+ * Return: >= nr_cpu_ids if no further cpus set in both.
  */
 static inline
 unsigned int cpumask_next_and(int n, const struct cpumask *src1p,
@@ -390,7 +390,7 @@ unsigned int __pure cpumask_next_wrap(int n, const struct cpumask *mask, int sta
  * @cpu: the cpu to ignore.
  *
  * Often used to find any cpu but smp_processor_id() in a mask.
- * Returns >= nr_cpu_ids if no cpus set.
+ * Return: >= nr_cpu_ids if no cpus set.
  */
 static inline
 unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
@@ -430,9 +430,9 @@ unsigned int cpumask_any_and_but(const struct cpumask *mask1,
 /**
  * cpumask_nth - get the Nth cpu in a cpumask
  * @srcp: the cpumask pointer
- * @cpu: the N'th cpu to find, starting from 0
+ * @cpu: the Nth cpu to find, starting from 0
  *
- * Returns >= nr_cpu_ids if such cpu doesn't exist.
+ * Return: >= nr_cpu_ids if such cpu doesn't exist.
  */
 static inline unsigned int cpumask_nth(unsigned int cpu, const struct cpumask *srcp)
 {
@@ -440,12 +440,12 @@ static inline unsigned int cpumask_nth(unsigned int cpu, const struct cpumask *s
 }
 
 /**
- * cpumask_nth_and - get the first cpu in 2 cpumasks
+ * cpumask_nth_and - get the Nth cpu in 2 cpumasks
  * @srcp1: the cpumask pointer
  * @srcp2: the cpumask pointer
- * @cpu: the N'th cpu to find, starting from 0
+ * @cpu: the Nth cpu to find, starting from 0
  *
- * Returns >= nr_cpu_ids if such cpu doesn't exist.
+ * Return: >= nr_cpu_ids if such cpu doesn't exist.
  */
 static inline
 unsigned int cpumask_nth_and(unsigned int cpu, const struct cpumask *srcp1,
@@ -456,12 +456,12 @@ unsigned int cpumask_nth_and(unsigned int cpu, const struct cpumask *srcp1,
 }
 
 /**
- * cpumask_nth_andnot - get the first cpu set in 1st cpumask, and clear in 2nd.
+ * cpumask_nth_andnot - get the Nth cpu set in 1st cpumask, and clear in 2nd.
  * @srcp1: the cpumask pointer
  * @srcp2: the cpumask pointer
- * @cpu: the N'th cpu to find, starting from 0
+ * @cpu: the Nth cpu to find, starting from 0
  *
- * Returns >= nr_cpu_ids if such cpu doesn't exist.
+ * Return: >= nr_cpu_ids if such cpu doesn't exist.
  */
 static inline
 unsigned int cpumask_nth_andnot(unsigned int cpu, const struct cpumask *srcp1,
@@ -476,9 +476,9 @@ unsigned int cpumask_nth_andnot(unsigned int cpu, const struct cpumask *srcp1,
  * @srcp1: the cpumask pointer
  * @srcp2: the cpumask pointer
  * @srcp3: the cpumask pointer
- * @cpu: the N'th cpu to find, starting from 0
+ * @cpu: the Nth cpu to find, starting from 0
  *
- * Returns >= nr_cpu_ids if such cpu doesn't exist.
+ * Return: >= nr_cpu_ids if such cpu doesn't exist.
  */
 static __always_inline
 unsigned int cpumask_nth_and_andnot(unsigned int cpu, const struct cpumask *srcp1,
@@ -537,7 +537,7 @@ static __always_inline void __cpumask_clear_cpu(int cpu, struct cpumask *dstp)
  * @cpu: cpu number (< nr_cpu_ids)
  * @cpumask: the cpumask pointer
  *
- * Returns true if @cpu is set in @cpumask, else returns false
+ * Return: true if @cpu is set in @cpumask, else returns false
  */
 static __always_inline bool cpumask_test_cpu(int cpu, const struct cpumask *cpumask)
 {
@@ -549,9 +549,9 @@ static __always_inline bool cpumask_test_cpu(int cpu, const struct cpumask *cpum
  * @cpu: cpu number (< nr_cpu_ids)
  * @cpumask: the cpumask pointer
  *
- * Returns true if @cpu is set in old bitmap of @cpumask, else returns false
- *
  * test_and_set_bit wrapper for cpumasks.
+ *
+ * Return: true if @cpu is set in old bitmap of @cpumask, else returns false
  */
 static __always_inline bool cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
 {
@@ -563,9 +563,9 @@ static __always_inline bool cpumask_test_and_set_cpu(int cpu, struct cpumask *cp
  * @cpu: cpu number (< nr_cpu_ids)
  * @cpumask: the cpumask pointer
  *
- * Returns true if @cpu is set in old bitmap of @cpumask, else returns false
- *
  * test_and_clear_bit wrapper for cpumasks.
+ *
+ * Return: true if @cpu is set in old bitmap of @cpumask, else returns false
  */
 static __always_inline bool cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
 {
@@ -600,7 +600,7 @@ static inline void cpumask_clear(struct cpumask *dstp)
  * @src1p: the first input
  * @src2p: the second input
  *
- * If *@dstp is empty, returns false, else returns true
+ * Return: false if *@dstp is empty, else returns true
  */
 static inline bool cpumask_and(struct cpumask *dstp,
 			       const struct cpumask *src1p,
@@ -643,7 +643,7 @@ static inline void cpumask_xor(struct cpumask *dstp,
  * @src1p: the first input
  * @src2p: the second input
  *
- * If *@dstp is empty, returns false, else returns true
+ * Return: false if *@dstp is empty, else returns true
  */
 static inline bool cpumask_andnot(struct cpumask *dstp,
 				  const struct cpumask *src1p,
@@ -657,6 +657,8 @@ static inline bool cpumask_andnot(struct cpumask *dstp,
  * cpumask_equal - *src1p == *src2p
  * @src1p: the first input
  * @src2p: the second input
+ *
+ * Return: true if the cpumasks are equal, false if not
  */
 static inline bool cpumask_equal(const struct cpumask *src1p,
 				const struct cpumask *src2p)
@@ -670,6 +672,9 @@ static inline bool cpumask_equal(const struct cpumask *src1p,
  * @src1p: the first input
  * @src2p: the second input
  * @src3p: the third input
+ *
+ * Return: true if first cpumask ORed with second cpumask == third cpumask,
+ *	   otherwise false
  */
 static inline bool cpumask_or_equal(const struct cpumask *src1p,
 				    const struct cpumask *src2p,
@@ -683,6 +688,9 @@ static inline bool cpumask_or_equal(const struct cpumask *src1p,
  * cpumask_intersects - (*src1p & *src2p) != 0
  * @src1p: the first input
  * @src2p: the second input
+ *
+ * Return: true if first cpumask ANDed with second cpumask is non-empty,
+ *	   otherwise false
  */
 static inline bool cpumask_intersects(const struct cpumask *src1p,
 				     const struct cpumask *src2p)
@@ -696,7 +704,7 @@ static inline bool cpumask_intersects(const struct cpumask *src1p,
  * @src1p: the first input
  * @src2p: the second input
  *
- * Returns true if *@src1p is a subset of *@src2p, else returns false
+ * Return: true if *@src1p is a subset of *@src2p, else returns false
  */
 static inline bool cpumask_subset(const struct cpumask *src1p,
 				 const struct cpumask *src2p)
@@ -708,6 +716,8 @@ static inline bool cpumask_subset(const struct cpumask *src1p,
 /**
  * cpumask_empty - *srcp == 0
  * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
+ *
+ * Return: true if srcp is empty (has no bits set), else false
  */
 static inline bool cpumask_empty(const struct cpumask *srcp)
 {
@@ -717,6 +727,8 @@ static inline bool cpumask_empty(const struct cpumask *srcp)
 /**
  * cpumask_full - *srcp == 0xFFFFFFFF...
  * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
+ *
+ * Return: true if srcp is full (has all bits set), else false
  */
 static inline bool cpumask_full(const struct cpumask *srcp)
 {
@@ -726,6 +738,8 @@ static inline bool cpumask_full(const struct cpumask *srcp)
 /**
  * cpumask_weight - Count of bits in *srcp
  * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
+ *
+ * Return: count of bits set in *srcp
  */
 static inline unsigned int cpumask_weight(const struct cpumask *srcp)
 {
@@ -736,6 +750,8 @@ static inline unsigned int cpumask_weight(const struct cpumask *srcp)
  * cpumask_weight_and - Count of bits in (*srcp1 & *srcp2)
  * @srcp1: the cpumask to count bits (< nr_cpu_ids) in.
  * @srcp2: the cpumask to count bits (< nr_cpu_ids) in.
+ *
+ * Return: count of bits set in both *srcp1 and *srcp2
  */
 static inline unsigned int cpumask_weight_and(const struct cpumask *srcp1,
 						const struct cpumask *srcp2)
@@ -784,7 +800,7 @@ static inline void cpumask_copy(struct cpumask *dstp,
  * cpumask_any - pick a "random" cpu from *srcp
  * @srcp: the input cpumask
  *
- * Returns >= nr_cpu_ids if no cpus set.
+ * Return: >= nr_cpu_ids if no cpus set.
  */
 #define cpumask_any(srcp) cpumask_first(srcp)
 
@@ -793,7 +809,7 @@ static inline void cpumask_copy(struct cpumask *dstp,
  * @mask1: the first input cpumask
  * @mask2: the second input cpumask
  *
- * Returns >= nr_cpu_ids if no cpus set.
+ * Return: >= nr_cpu_ids if no cpus set.
  */
 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
 
@@ -809,7 +825,7 @@ static inline void cpumask_copy(struct cpumask *dstp,
  * @len: the length of the buffer
  * @dstp: the cpumask to set.
  *
- * Returns -errno, or 0 for success.
+ * Return: -errno, or 0 for success.
  */
 static inline int cpumask_parse_user(const char __user *buf, int len,
 				     struct cpumask *dstp)
@@ -823,7 +839,7 @@ static inline int cpumask_parse_user(const char __user *buf, int len,
  * @len: the length of the buffer
  * @dstp: the cpumask to set.
  *
- * Returns -errno, or 0 for success.
+ * Return: -errno, or 0 for success.
  */
 static inline int cpumask_parselist_user(const char __user *buf, int len,
 				     struct cpumask *dstp)
@@ -837,7 +853,7 @@ static inline int cpumask_parselist_user(const char __user *buf, int len,
  * @buf: the buffer to extract from
  * @dstp: the cpumask to set.
  *
- * Returns -errno, or 0 for success.
+ * Return: -errno, or 0 for success.
  */
 static inline int cpumask_parse(const char *buf, struct cpumask *dstp)
 {
@@ -849,7 +865,7 @@ static inline int cpumask_parse(const char *buf, struct cpumask *dstp)
  * @buf: the buffer to extract from
  * @dstp: the cpumask to set.
  *
- * Returns -errno, or 0 for success.
+ * Return: -errno, or 0 for success.
  */
 static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
 {
@@ -857,7 +873,9 @@ static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
 }
 
 /**
- * cpumask_size - size to allocate for a 'struct cpumask' in bytes
+ * cpumask_size - calculate size to allocate for a 'struct cpumask' in bytes
+ *
+ * Return: size to allocate for a &struct cpumask in bytes
  */
 static inline unsigned int cpumask_size(void)
 {
@@ -871,7 +889,7 @@ static inline unsigned int cpumask_size(void)
  * little more difficult, we typedef cpumask_var_t to an array or a
  * pointer: doing &mask on an array is a noop, so it still works.
  *
- * ie.
+ * i.e.
  *	cpumask_var_t tmpmask;
  *	if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
  *		return -ENOMEM;
@@ -927,6 +945,8 @@ bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
  * a nop returning a constant 1 (in <linux/cpumask.h>).
  *
  * See alloc_cpumask_var_node.
+ *
+ * Return: %true if allocation succeeded, %false if not
  */
 static inline
 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
@@ -1037,7 +1057,7 @@ static inline void reset_cpu_possible_mask(void)
 void set_cpu_online(unsigned int cpu, bool online);
 
 /**
- * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
+ * to_cpumask - convert a NR_CPUS bitmap to a struct cpumask *
  * @bitmap: the bitmap
  *
  * There are a few places where cpumask_var_t isn't appropriate and
@@ -1080,6 +1100,8 @@ static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
  * interface gives only a momentary snapshot and is not protected against
  * concurrent CPU hotplug operations unless invoked from a cpuhp_lock held
  * region.
+ *
+ * Return: momentary snapshot of the number of online CPUs
  */
 static __always_inline unsigned int num_online_cpus(void)
 {
@@ -1172,7 +1194,7 @@ static inline bool cpu_dying(unsigned int cpu)
  * @mask: the cpumask to copy
  * @buf: the buffer to copy into
  *
- * Returns the length of the (null-terminated) @buf string, zero if
+ * Return: the length of the (null-terminated) @buf string, zero if
  * nothing is copied.
  */
 static inline ssize_t
@@ -1195,7 +1217,7 @@ cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask)
  * cpumask; Typically used by bin_attribute to export cpumask bitmask
  * ABI.
  *
- * Returns the length of how many bytes have been copied, excluding
+ * Return: the length of how many bytes have been copied, excluding
  * terminating '\0'.
  */
 static inline ssize_t
@@ -1216,6 +1238,9 @@ cpumap_print_bitmask_to_buf(char *buf, const struct cpumask *mask,
  *
  * Everything is same with the above cpumap_print_bitmask_to_buf()
  * except the print format.
+ *
+ * Return: the length of how many bytes have been copied, excluding
+ * terminating '\0'.
  */
 static inline ssize_t
 cpumap_print_list_to_buf(char *buf, const struct cpumask *mask,
diff --git a/lib/cpumask.c b/lib/cpumask.c
index 34335c1e7265..e77ee9d46f71 100644
--- a/lib/cpumask.c
+++ b/lib/cpumask.c
@@ -14,7 +14,7 @@
  * @start: the start point of the iteration
  * @wrap: assume @n crossing @start terminates the iteration
  *
- * Returns >= nr_cpu_ids on completion
+ * Return: >= nr_cpu_ids on completion
  *
  * Note: the @wrap argument is required for the start condition when
  * we cannot assume @start is set in @mask.
@@ -48,8 +48,9 @@ EXPORT_SYMBOL(cpumask_next_wrap);
  * @node: memory node from which to allocate or %NUMA_NO_NODE
  *
  * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
- * a nop returning a constant 1 (in <linux/cpumask.h>)
- * Returns TRUE if memory allocation succeeded, FALSE otherwise.
+ * a nop returning a constant 1 (in <linux/cpumask.h>).
+ *
+ * Return: TRUE if memory allocation succeeded, FALSE otherwise.
  *
  * In addition, mask will be NULL if this fails.  Note that gcc is
  * usually smart enough to know that mask can never be NULL if
@@ -115,7 +116,7 @@ void __init free_bootmem_cpumask_var(cpumask_var_t mask)
  * @i: index number
  * @node: local numa_node
  *
- * Returns online CPU according to a numa aware policy; local cpus are returned
+ * Return: online CPU according to a numa aware policy; local cpus are returned
  * first, followed by non-local ones, then it wraps around.
  *
  * For those who wants to enumerate all CPUs based on their NUMA distances,
@@ -163,7 +164,7 @@ static DEFINE_PER_CPU(int, distribute_cpu_mask_prev);
  * Iterated calls using the same srcp1 and srcp2 will be distributed within
  * their intersection.
  *
- * Returns >= nr_cpu_ids if the intersection is empty.
+ * Return: >= nr_cpu_ids if the intersection is empty.
  */
 unsigned int cpumask_any_and_distribute(const struct cpumask *src1p,
 			       const struct cpumask *src2p)
@@ -182,6 +183,12 @@ unsigned int cpumask_any_and_distribute(const struct cpumask *src1p,
 }
 EXPORT_SYMBOL(cpumask_any_and_distribute);
 
+/**
+ * cpumask_any_distribute - Return an arbitrary cpu from srcp
+ * @srcp: &cpumask for selection
+ *
+ * Return: >= nr_cpu_ids if the intersection is empty.
+ */
 unsigned int cpumask_any_distribute(const struct cpumask *srcp)
 {
 	unsigned int next, prev;
-- 
Gitee


From fd101eeedf20aac571295d8c0cf0f4cdd89ecdd6 Mon Sep 17 00:00:00 2001
From: Yury Norov <yury.norov@gmail.com>
Date: Sun, 28 Jan 2024 22:21:04 -0800
Subject: [PATCH 232/280] cpumask: add cpumask_weight_andnot()

ANBZ: #31045

commit c1f5204efcbcced83f67f12fa8f1a7f5f244fb87 upstream.

Similarly to cpumask_weight_and(), cpumask_weight_andnot() is a handy
helper that may help to avoid creating an intermediate mask just to
calculate number of bits that set in a 1st given mask, and clear in 2nd
one.

Intel-SIG: commit c1f5204efcbc cpumask: add cpumask_weight_andnot()
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/bitmap.h  | 12 ++++++++++++
 include/linux/cpumask.h | 13 +++++++++++++
 lib/bitmap.c            |  7 +++++++
 3 files changed, 32 insertions(+)

diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index 850ecce05de9..6100b05c943f 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -53,6 +53,7 @@ struct device;
  *  bitmap_full(src, nbits)                     Are all bits set in *src?
  *  bitmap_weight(src, nbits)                   Hamming Weight: number set bits
  *  bitmap_weight_and(src1, src2, nbits)        Hamming Weight of and'ed bitmap
+ *  bitmap_weight_andnot(src1, src2, nbits)     Hamming Weight of andnot'ed bitmap
  *  bitmap_set(dst, pos, nbits)                 Set specified bit area
  *  bitmap_clear(dst, pos, nbits)               Clear specified bit area
  *  bitmap_find_next_zero_area(buf, len, pos, n, mask)  Find bit free area
@@ -174,6 +175,8 @@ bool __bitmap_subset(const unsigned long *bitmap1,
 unsigned int __bitmap_weight(const unsigned long *bitmap, unsigned int nbits);
 unsigned int __bitmap_weight_and(const unsigned long *bitmap1,
 				 const unsigned long *bitmap2, unsigned int nbits);
+unsigned int __bitmap_weight_andnot(const unsigned long *bitmap1,
+				    const unsigned long *bitmap2, unsigned int nbits);
 void __bitmap_set(unsigned long *map, unsigned int start, int len);
 void __bitmap_clear(unsigned long *map, unsigned int start, int len);
 
@@ -469,6 +472,15 @@ unsigned long bitmap_weight_and(const unsigned long *src1,
 	return __bitmap_weight_and(src1, src2, nbits);
 }
 
+static __always_inline
+unsigned long bitmap_weight_andnot(const unsigned long *src1,
+				   const unsigned long *src2, unsigned int nbits)
+{
+	if (small_const_nbits(nbits))
+		return hweight_long(*src1 & ~(*src2) & BITMAP_LAST_WORD_MASK(nbits));
+	return __bitmap_weight_andnot(src1, src2, nbits);
+}
+
 static __always_inline void bitmap_set(unsigned long *map, unsigned int start,
 		unsigned int nbits)
 {
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 95d9b2e7c2b0..ff5a9091ec88 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -759,6 +759,19 @@ static inline unsigned int cpumask_weight_and(const struct cpumask *srcp1,
 	return bitmap_weight_and(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits);
 }
 
+/**
+ * cpumask_weight_andnot - Count of bits in (*srcp1 & ~*srcp2)
+ * @srcp1: the cpumask to count bits (< nr_cpu_ids) in.
+ * @srcp2: the cpumask to count bits (< nr_cpu_ids) in.
+ *
+ * Return: count of bits set in both *srcp1 and *srcp2
+ */
+static inline unsigned int cpumask_weight_andnot(const struct cpumask *srcp1,
+						const struct cpumask *srcp2)
+{
+	return bitmap_weight_andnot(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits);
+}
+
 /**
  * cpumask_shift_right - *dstp = *srcp >> n
  * @dstp: the cpumask result
diff --git a/lib/bitmap.c b/lib/bitmap.c
index ddb31015e38a..4bd5fb263b1d 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -359,6 +359,13 @@ unsigned int __bitmap_weight_and(const unsigned long *bitmap1,
 }
 EXPORT_SYMBOL(__bitmap_weight_and);
 
+unsigned int __bitmap_weight_andnot(const unsigned long *bitmap1,
+				const unsigned long *bitmap2, unsigned int bits)
+{
+	return BITMAP_WEIGHT(bitmap1[idx] & ~bitmap2[idx], bits);
+}
+EXPORT_SYMBOL(__bitmap_weight_andnot);
+
 void __bitmap_set(unsigned long *map, unsigned int start, int len)
 {
 	unsigned long *p = map + BIT_WORD(start);
-- 
Gitee


From 72b5cb60c66ea035f76ab4d82ce7ae22a3c8fab6 Mon Sep 17 00:00:00 2001
From: Brian Norris <briannorris@chromium.org>
Date: Thu, 18 Jul 2024 17:50:39 -0700
Subject: [PATCH 233/280] cpumask: Switch from inline to __always_inline

ANBZ: #31045

commit ab6b1010dab68f6d4bf063517db4ce2d63554bc6 upstream.

On recent (v6.6+) builds with Clang (based on Clang 18.0.0) and certain
configurations [0], I'm finding that (lack of) inlining decisions may
lead to section mismatch warnings like the following:

  WARNING: modpost: vmlinux.o: section mismatch in reference:
  cpumask_andnot (section: .text) ->
  cpuhp_bringup_cpus_parallel.tmp_mask (section: .init.data) ERROR:
  modpost: Section mismatches detected.

or more confusingly:

  WARNING: modpost: vmlinux: section mismatch in reference:
  cpumask_andnot+0x5f (section: .text) -> efi_systab_phys (section:
  .init.data)

The first warning makes a little sense, because
cpuhp_bringup_cpus_parallel() (an __init function) calls
cpumask_andnot() on tmp_mask (an __initdata symbol). If the compiler
doesn't inline cpumask_andnot(), this may appear like a mismatch.

The second warning makes less sense, but might be because efi_systab_phys
and cpuhp_bringup_cpus_parallel.tmp_mask are laid out near each other,
and the latter isn't a proper C symbol definition.

In any case, it seems a reasonable solution to suggest more strongly to
the compiler that these cpumask macros *must* be inlined, as 'inline' is
just a recommendation.

This change has been previously proposed in the past as:

  Subject: [PATCH 1/3] bitmap: switch from inline to __always_inline
  https://lore.kernel.org/all/20221027043810.350460-2-yury.norov@gmail.com/

But the change has been split up, to separately justify the cpumask
changes (which drive my work) and the bitmap/const optimizations (that
Yury separately proposed for other reasons). This ends up as somewhere
between a "rebase" and "rewrite" -- I had to rewrite most of the patch.

According to bloat-o-meter, vmlinux decreases minimally in size (-0.00%
to -0.01%, depending on the version of GCC or Clang and .config in
question) with this series of changes:

gcc 13.2.0, x86_64_defconfig
-3005 bytes, Before=21944501, After=21941496, chg -0.01%

clang 16.0.6, x86_64_defconfig
-105 bytes, Before=22571692, After=22571587, chg -0.00%

gcc 9.5.0, x86_64_defconfig
-1771 bytes, Before=21557598, After=21555827, chg -0.01%

clang 18.0_pre516547 (ChromiumOS toolchain), x86_64_defconfig
-191 bytes, Before=22615339, After=22615148, chg -0.00%

clang 18.0_pre516547 (ChromiumOS toolchain), based on ChromiumOS config + gcov
-979 bytes, Before=76294783, After=76293804, chg -0.00%

[0] CONFIG_HOTPLUG_PARALLEL=y ('select'ed for x86 as of [1]) and
    CONFIG_GCOV_PROFILE_ALL.

[1] commit 0c7ffa32dbd6 ("x86/smpboot/64: Implement
    arch_cpuhp_init_parallel_bringup() and enable it")

Intel-SIG: commit ab6b1010dab6 cpumask: Switch from inline to __always_inline
Backport Resctrl/RDT-SNC for Intel platforms

Co-developed-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Kees Cook <kees@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/cpumask.h | 208 +++++++++++++++++++++-------------------
 1 file changed, 110 insertions(+), 98 deletions(-)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index ff5a9091ec88..fbfd28280470 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -41,7 +41,7 @@ typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
 extern unsigned int nr_cpu_ids;
 #endif
 
-static inline void set_nr_cpu_ids(unsigned int nr)
+static __always_inline void set_nr_cpu_ids(unsigned int nr)
 {
 #if (NR_CPUS == 1) || defined(CONFIG_FORCE_NR_CPUS)
 	WARN_ON(nr != nr_cpu_ids);
@@ -157,7 +157,7 @@ static __always_inline unsigned int cpumask_check(unsigned int cpu)
  *
  * Return: >= nr_cpu_ids if no cpus set.
  */
-static inline unsigned int cpumask_first(const struct cpumask *srcp)
+static __always_inline unsigned int cpumask_first(const struct cpumask *srcp)
 {
 	return find_first_bit(cpumask_bits(srcp), small_cpumask_bits);
 }
@@ -168,7 +168,7 @@ static inline unsigned int cpumask_first(const struct cpumask *srcp)
  *
  * Return: >= nr_cpu_ids if all cpus are set.
  */
-static inline unsigned int cpumask_first_zero(const struct cpumask *srcp)
+static __always_inline unsigned int cpumask_first_zero(const struct cpumask *srcp)
 {
 	return find_first_zero_bit(cpumask_bits(srcp), small_cpumask_bits);
 }
@@ -180,7 +180,7 @@ static inline unsigned int cpumask_first_zero(const struct cpumask *srcp)
  *
  * Return: >= nr_cpu_ids if no cpus set in both.  See also cpumask_next_and().
  */
-static inline
+static __always_inline
 unsigned int cpumask_first_and(const struct cpumask *srcp1, const struct cpumask *srcp2)
 {
 	return find_first_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits);
@@ -194,7 +194,7 @@ unsigned int cpumask_first_and(const struct cpumask *srcp1, const struct cpumask
  *
  * Return: >= nr_cpu_ids if no cpus set in all.
  */
-static inline
+static __always_inline
 unsigned int cpumask_first_and_and(const struct cpumask *srcp1,
 				   const struct cpumask *srcp2,
 				   const struct cpumask *srcp3)
@@ -209,7 +209,7 @@ unsigned int cpumask_first_and_and(const struct cpumask *srcp1,
  *
  * Return:	>= nr_cpumask_bits if no CPUs set.
  */
-static inline unsigned int cpumask_last(const struct cpumask *srcp)
+static __always_inline unsigned int cpumask_last(const struct cpumask *srcp)
 {
 	return find_last_bit(cpumask_bits(srcp), small_cpumask_bits);
 }
@@ -221,7 +221,7 @@ static inline unsigned int cpumask_last(const struct cpumask *srcp)
  *
  * Return: >= nr_cpu_ids if no further cpus set.
  */
-static inline
+static __always_inline
 unsigned int cpumask_next(int n, const struct cpumask *srcp)
 {
 	/* -1 is a legal arg here. */
@@ -237,7 +237,8 @@ unsigned int cpumask_next(int n, const struct cpumask *srcp)
  *
  * Return: >= nr_cpu_ids if no further cpus unset.
  */
-static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
+static __always_inline
+unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
 {
 	/* -1 is a legal arg here. */
 	if (n != -1)
@@ -247,18 +248,21 @@ static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
 
 #if NR_CPUS == 1
 /* Uniprocessor: there is only one valid CPU */
-static inline unsigned int cpumask_local_spread(unsigned int i, int node)
+static __always_inline
+unsigned int cpumask_local_spread(unsigned int i, int node)
 {
 	return 0;
 }
 
-static inline unsigned int cpumask_any_and_distribute(const struct cpumask *src1p,
-						      const struct cpumask *src2p)
+static __always_inline
+unsigned int cpumask_any_and_distribute(const struct cpumask *src1p,
+					const struct cpumask *src2p)
 {
 	return cpumask_first_and(src1p, src2p);
 }
 
-static inline unsigned int cpumask_any_distribute(const struct cpumask *srcp)
+static __always_inline
+unsigned int cpumask_any_distribute(const struct cpumask *srcp)
 {
 	return cpumask_first(srcp);
 }
@@ -277,9 +281,9 @@ unsigned int cpumask_any_distribute(const struct cpumask *srcp);
  *
  * Return: >= nr_cpu_ids if no further cpus set in both.
  */
-static inline
+static __always_inline
 unsigned int cpumask_next_and(int n, const struct cpumask *src1p,
-		     const struct cpumask *src2p)
+			      const struct cpumask *src2p)
 {
 	/* -1 is a legal arg here. */
 	if (n != -1)
@@ -299,7 +303,7 @@ unsigned int cpumask_next_and(int n, const struct cpumask *src1p,
 	for_each_set_bit(cpu, cpumask_bits(mask), small_cpumask_bits)
 
 #if NR_CPUS == 1
-static inline
+static __always_inline
 unsigned int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap)
 {
 	cpumask_check(start);
@@ -392,7 +396,7 @@ unsigned int __pure cpumask_next_wrap(int n, const struct cpumask *mask, int sta
  * Often used to find any cpu but smp_processor_id() in a mask.
  * Return: >= nr_cpu_ids if no cpus set.
  */
-static inline
+static __always_inline
 unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
 {
 	unsigned int i;
@@ -412,7 +416,7 @@ unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
  *
  * Returns >= nr_cpu_ids if no cpus set.
  */
-static inline
+static __always_inline
 unsigned int cpumask_any_and_but(const struct cpumask *mask1,
 				 const struct cpumask *mask2,
 				 unsigned int cpu)
@@ -434,7 +438,8 @@ unsigned int cpumask_any_and_but(const struct cpumask *mask1,
  *
  * Return: >= nr_cpu_ids if such cpu doesn't exist.
  */
-static inline unsigned int cpumask_nth(unsigned int cpu, const struct cpumask *srcp)
+static __always_inline
+unsigned int cpumask_nth(unsigned int cpu, const struct cpumask *srcp)
 {
 	return find_nth_bit(cpumask_bits(srcp), small_cpumask_bits, cpumask_check(cpu));
 }
@@ -447,7 +452,7 @@ static inline unsigned int cpumask_nth(unsigned int cpu, const struct cpumask *s
  *
  * Return: >= nr_cpu_ids if such cpu doesn't exist.
  */
-static inline
+static __always_inline
 unsigned int cpumask_nth_and(unsigned int cpu, const struct cpumask *srcp1,
 							const struct cpumask *srcp2)
 {
@@ -463,7 +468,7 @@ unsigned int cpumask_nth_and(unsigned int cpu, const struct cpumask *srcp1,
  *
  * Return: >= nr_cpu_ids if such cpu doesn't exist.
  */
-static inline
+static __always_inline
 unsigned int cpumask_nth_andnot(unsigned int cpu, const struct cpumask *srcp1,
 							const struct cpumask *srcp2)
 {
@@ -506,12 +511,14 @@ unsigned int cpumask_nth_and_andnot(unsigned int cpu, const struct cpumask *srcp
  * @cpu: cpu number (< nr_cpu_ids)
  * @dstp: the cpumask pointer
  */
-static __always_inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
+static __always_inline
+void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
 {
 	set_bit(cpumask_check(cpu), cpumask_bits(dstp));
 }
 
-static __always_inline void __cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
+static __always_inline
+void __cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
 {
 	__set_bit(cpumask_check(cpu), cpumask_bits(dstp));
 }
@@ -539,7 +546,8 @@ static __always_inline void __cpumask_clear_cpu(int cpu, struct cpumask *dstp)
  *
  * Return: true if @cpu is set in @cpumask, else returns false
  */
-static __always_inline bool cpumask_test_cpu(int cpu, const struct cpumask *cpumask)
+static __always_inline
+bool cpumask_test_cpu(int cpu, const struct cpumask *cpumask)
 {
 	return test_bit(cpumask_check(cpu), cpumask_bits((cpumask)));
 }
@@ -553,7 +561,8 @@ static __always_inline bool cpumask_test_cpu(int cpu, const struct cpumask *cpum
  *
  * Return: true if @cpu is set in old bitmap of @cpumask, else returns false
  */
-static __always_inline bool cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
+static __always_inline
+bool cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
 {
 	return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
 }
@@ -567,7 +576,8 @@ static __always_inline bool cpumask_test_and_set_cpu(int cpu, struct cpumask *cp
  *
  * Return: true if @cpu is set in old bitmap of @cpumask, else returns false
  */
-static __always_inline bool cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
+static __always_inline
+bool cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
 {
 	return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
 }
@@ -576,7 +586,7 @@ static __always_inline bool cpumask_test_and_clear_cpu(int cpu, struct cpumask *
  * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
  * @dstp: the cpumask pointer
  */
-static inline void cpumask_setall(struct cpumask *dstp)
+static __always_inline void cpumask_setall(struct cpumask *dstp)
 {
 	if (small_const_nbits(small_cpumask_bits)) {
 		cpumask_bits(dstp)[0] = BITMAP_LAST_WORD_MASK(nr_cpumask_bits);
@@ -589,7 +599,7 @@ static inline void cpumask_setall(struct cpumask *dstp)
  * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
  * @dstp: the cpumask pointer
  */
-static inline void cpumask_clear(struct cpumask *dstp)
+static __always_inline void cpumask_clear(struct cpumask *dstp)
 {
 	bitmap_zero(cpumask_bits(dstp), large_cpumask_bits);
 }
@@ -602,9 +612,9 @@ static inline void cpumask_clear(struct cpumask *dstp)
  *
  * Return: false if *@dstp is empty, else returns true
  */
-static inline bool cpumask_and(struct cpumask *dstp,
-			       const struct cpumask *src1p,
-			       const struct cpumask *src2p)
+static __always_inline
+bool cpumask_and(struct cpumask *dstp, const struct cpumask *src1p,
+		 const struct cpumask *src2p)
 {
 	return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
 				       cpumask_bits(src2p), small_cpumask_bits);
@@ -616,8 +626,9 @@ static inline bool cpumask_and(struct cpumask *dstp,
  * @src1p: the first input
  * @src2p: the second input
  */
-static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
-			      const struct cpumask *src2p)
+static __always_inline
+void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
+		const struct cpumask *src2p)
 {
 	bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p),
 				      cpumask_bits(src2p), small_cpumask_bits);
@@ -629,9 +640,9 @@ static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
  * @src1p: the first input
  * @src2p: the second input
  */
-static inline void cpumask_xor(struct cpumask *dstp,
-			       const struct cpumask *src1p,
-			       const struct cpumask *src2p)
+static __always_inline
+void cpumask_xor(struct cpumask *dstp, const struct cpumask *src1p,
+		 const struct cpumask *src2p)
 {
 	bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p),
 				       cpumask_bits(src2p), small_cpumask_bits);
@@ -645,9 +656,9 @@ static inline void cpumask_xor(struct cpumask *dstp,
  *
  * Return: false if *@dstp is empty, else returns true
  */
-static inline bool cpumask_andnot(struct cpumask *dstp,
-				  const struct cpumask *src1p,
-				  const struct cpumask *src2p)
+static __always_inline
+bool cpumask_andnot(struct cpumask *dstp, const struct cpumask *src1p,
+		    const struct cpumask *src2p)
 {
 	return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
 					  cpumask_bits(src2p), small_cpumask_bits);
@@ -660,8 +671,8 @@ static inline bool cpumask_andnot(struct cpumask *dstp,
  *
  * Return: true if the cpumasks are equal, false if not
  */
-static inline bool cpumask_equal(const struct cpumask *src1p,
-				const struct cpumask *src2p)
+static __always_inline
+bool cpumask_equal(const struct cpumask *src1p, const struct cpumask *src2p)
 {
 	return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
 						 small_cpumask_bits);
@@ -676,9 +687,9 @@ static inline bool cpumask_equal(const struct cpumask *src1p,
  * Return: true if first cpumask ORed with second cpumask == third cpumask,
  *	   otherwise false
  */
-static inline bool cpumask_or_equal(const struct cpumask *src1p,
-				    const struct cpumask *src2p,
-				    const struct cpumask *src3p)
+static __always_inline
+bool cpumask_or_equal(const struct cpumask *src1p, const struct cpumask *src2p,
+		      const struct cpumask *src3p)
 {
 	return bitmap_or_equal(cpumask_bits(src1p), cpumask_bits(src2p),
 			       cpumask_bits(src3p), small_cpumask_bits);
@@ -692,8 +703,8 @@ static inline bool cpumask_or_equal(const struct cpumask *src1p,
  * Return: true if first cpumask ANDed with second cpumask is non-empty,
  *	   otherwise false
  */
-static inline bool cpumask_intersects(const struct cpumask *src1p,
-				     const struct cpumask *src2p)
+static __always_inline
+bool cpumask_intersects(const struct cpumask *src1p, const struct cpumask *src2p)
 {
 	return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p),
 						      small_cpumask_bits);
@@ -706,8 +717,8 @@ static inline bool cpumask_intersects(const struct cpumask *src1p,
  *
  * Return: true if *@src1p is a subset of *@src2p, else returns false
  */
-static inline bool cpumask_subset(const struct cpumask *src1p,
-				 const struct cpumask *src2p)
+static __always_inline
+bool cpumask_subset(const struct cpumask *src1p, const struct cpumask *src2p)
 {
 	return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p),
 						  small_cpumask_bits);
@@ -719,7 +730,7 @@ static inline bool cpumask_subset(const struct cpumask *src1p,
  *
  * Return: true if srcp is empty (has no bits set), else false
  */
-static inline bool cpumask_empty(const struct cpumask *srcp)
+static __always_inline bool cpumask_empty(const struct cpumask *srcp)
 {
 	return bitmap_empty(cpumask_bits(srcp), small_cpumask_bits);
 }
@@ -730,7 +741,7 @@ static inline bool cpumask_empty(const struct cpumask *srcp)
  *
  * Return: true if srcp is full (has all bits set), else false
  */
-static inline bool cpumask_full(const struct cpumask *srcp)
+static __always_inline bool cpumask_full(const struct cpumask *srcp)
 {
 	return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits);
 }
@@ -741,7 +752,7 @@ static inline bool cpumask_full(const struct cpumask *srcp)
  *
  * Return: count of bits set in *srcp
  */
-static inline unsigned int cpumask_weight(const struct cpumask *srcp)
+static __always_inline unsigned int cpumask_weight(const struct cpumask *srcp)
 {
 	return bitmap_weight(cpumask_bits(srcp), small_cpumask_bits);
 }
@@ -753,8 +764,8 @@ static inline unsigned int cpumask_weight(const struct cpumask *srcp)
  *
  * Return: count of bits set in both *srcp1 and *srcp2
  */
-static inline unsigned int cpumask_weight_and(const struct cpumask *srcp1,
-						const struct cpumask *srcp2)
+static __always_inline
+unsigned int cpumask_weight_and(const struct cpumask *srcp1, const struct cpumask *srcp2)
 {
 	return bitmap_weight_and(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits);
 }
@@ -766,8 +777,9 @@ static inline unsigned int cpumask_weight_and(const struct cpumask *srcp1,
  *
  * Return: count of bits set in both *srcp1 and *srcp2
  */
-static inline unsigned int cpumask_weight_andnot(const struct cpumask *srcp1,
-						const struct cpumask *srcp2)
+static __always_inline
+unsigned int cpumask_weight_andnot(const struct cpumask *srcp1,
+				   const struct cpumask *srcp2)
 {
 	return bitmap_weight_andnot(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits);
 }
@@ -778,8 +790,8 @@ static inline unsigned int cpumask_weight_andnot(const struct cpumask *srcp1,
  * @srcp: the input to shift
  * @n: the number of bits to shift by
  */
-static inline void cpumask_shift_right(struct cpumask *dstp,
-				       const struct cpumask *srcp, int n)
+static __always_inline
+void cpumask_shift_right(struct cpumask *dstp, const struct cpumask *srcp, int n)
 {
 	bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
 					       small_cpumask_bits);
@@ -791,8 +803,8 @@ static inline void cpumask_shift_right(struct cpumask *dstp,
  * @srcp: the input to shift
  * @n: the number of bits to shift by
  */
-static inline void cpumask_shift_left(struct cpumask *dstp,
-				      const struct cpumask *srcp, int n)
+static __always_inline
+void cpumask_shift_left(struct cpumask *dstp, const struct cpumask *srcp, int n)
 {
 	bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
 					      nr_cpumask_bits);
@@ -803,8 +815,8 @@ static inline void cpumask_shift_left(struct cpumask *dstp,
  * @dstp: the result
  * @srcp: the input cpumask
  */
-static inline void cpumask_copy(struct cpumask *dstp,
-				const struct cpumask *srcp)
+static __always_inline
+void cpumask_copy(struct cpumask *dstp, const struct cpumask *srcp)
 {
 	bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), large_cpumask_bits);
 }
@@ -840,8 +852,8 @@ static inline void cpumask_copy(struct cpumask *dstp,
  *
  * Return: -errno, or 0 for success.
  */
-static inline int cpumask_parse_user(const char __user *buf, int len,
-				     struct cpumask *dstp)
+static __always_inline
+int cpumask_parse_user(const char __user *buf, int len, struct cpumask *dstp)
 {
 	return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
 }
@@ -854,8 +866,8 @@ static inline int cpumask_parse_user(const char __user *buf, int len,
  *
  * Return: -errno, or 0 for success.
  */
-static inline int cpumask_parselist_user(const char __user *buf, int len,
-				     struct cpumask *dstp)
+static __always_inline
+int cpumask_parselist_user(const char __user *buf, int len, struct cpumask *dstp)
 {
 	return bitmap_parselist_user(buf, len, cpumask_bits(dstp),
 				     nr_cpumask_bits);
@@ -868,7 +880,7 @@ static inline int cpumask_parselist_user(const char __user *buf, int len,
  *
  * Return: -errno, or 0 for success.
  */
-static inline int cpumask_parse(const char *buf, struct cpumask *dstp)
+static __always_inline int cpumask_parse(const char *buf, struct cpumask *dstp)
 {
 	return bitmap_parse(buf, UINT_MAX, cpumask_bits(dstp), nr_cpumask_bits);
 }
@@ -880,7 +892,7 @@ static inline int cpumask_parse(const char *buf, struct cpumask *dstp)
  *
  * Return: -errno, or 0 for success.
  */
-static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
+static __always_inline int cpulist_parse(const char *buf, struct cpumask *dstp)
 {
 	return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits);
 }
@@ -890,7 +902,7 @@ static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
  *
  * Return: size to allocate for a &struct cpumask in bytes
  */
-static inline unsigned int cpumask_size(void)
+static __always_inline unsigned int cpumask_size(void)
 {
 	return bitmap_size(large_cpumask_bits);
 }
@@ -943,7 +955,7 @@ typedef struct cpumask *cpumask_var_t;
 
 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
 
-static inline
+static __always_inline
 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
 {
 	return alloc_cpumask_var_node(mask, flags | __GFP_ZERO, node);
@@ -961,13 +973,13 @@ bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
  *
  * Return: %true if allocation succeeded, %false if not
  */
-static inline
+static __always_inline
 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
 {
 	return alloc_cpumask_var_node(mask, flags, NUMA_NO_NODE);
 }
 
-static inline
+static __always_inline
 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
 {
 	return alloc_cpumask_var(mask, flags | __GFP_ZERO);
@@ -977,7 +989,7 @@ void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
 void free_cpumask_var(cpumask_var_t mask);
 void free_bootmem_cpumask_var(cpumask_var_t mask);
 
-static inline bool cpumask_available(cpumask_var_t mask)
+static __always_inline bool cpumask_available(cpumask_var_t mask)
 {
 	return mask != NULL;
 }
@@ -988,43 +1000,43 @@ typedef struct cpumask cpumask_var_t[1];
 #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)
 #define __cpumask_var_read_mostly
 
-static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
+static __always_inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
 {
 	return true;
 }
 
-static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
+static __always_inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
 					  int node)
 {
 	return true;
 }
 
-static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
+static __always_inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
 {
 	cpumask_clear(*mask);
 	return true;
 }
 
-static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
+static __always_inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
 					  int node)
 {
 	cpumask_clear(*mask);
 	return true;
 }
 
-static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
+static __always_inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
 {
 }
 
-static inline void free_cpumask_var(cpumask_var_t mask)
+static __always_inline void free_cpumask_var(cpumask_var_t mask)
 {
 }
 
-static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
+static __always_inline void free_bootmem_cpumask_var(cpumask_var_t mask)
 {
 }
 
-static inline bool cpumask_available(cpumask_var_t mask)
+static __always_inline bool cpumask_available(cpumask_var_t mask)
 {
 	return true;
 }
@@ -1083,7 +1095,7 @@ void set_cpu_online(unsigned int cpu, bool online);
 	((struct cpumask *)(1 ? (bitmap)				\
 			    : (void *)sizeof(__check_is_bitmap(bitmap))))
 
-static inline int __check_is_bitmap(const unsigned long *bitmap)
+static __always_inline int __check_is_bitmap(const unsigned long *bitmap)
 {
 	return 1;
 }
@@ -1098,7 +1110,7 @@ static inline int __check_is_bitmap(const unsigned long *bitmap)
 extern const unsigned long
 	cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
 
-static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
+static __always_inline const struct cpumask *get_cpu_mask(unsigned int cpu)
 {
 	const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
 	p -= cpu / BITS_PER_LONG;
@@ -1124,27 +1136,27 @@ static __always_inline unsigned int num_online_cpus(void)
 #define num_present_cpus()	cpumask_weight(cpu_present_mask)
 #define num_active_cpus()	cpumask_weight(cpu_active_mask)
 
-static inline bool cpu_online(unsigned int cpu)
+static __always_inline bool cpu_online(unsigned int cpu)
 {
 	return cpumask_test_cpu(cpu, cpu_online_mask);
 }
 
-static inline bool cpu_possible(unsigned int cpu)
+static __always_inline bool cpu_possible(unsigned int cpu)
 {
 	return cpumask_test_cpu(cpu, cpu_possible_mask);
 }
 
-static inline bool cpu_present(unsigned int cpu)
+static __always_inline bool cpu_present(unsigned int cpu)
 {
 	return cpumask_test_cpu(cpu, cpu_present_mask);
 }
 
-static inline bool cpu_active(unsigned int cpu)
+static __always_inline bool cpu_active(unsigned int cpu)
 {
 	return cpumask_test_cpu(cpu, cpu_active_mask);
 }
 
-static inline bool cpu_dying(unsigned int cpu)
+static __always_inline bool cpu_dying(unsigned int cpu)
 {
 	return cpumask_test_cpu(cpu, cpu_dying_mask);
 }
@@ -1156,27 +1168,27 @@ static inline bool cpu_dying(unsigned int cpu)
 #define num_present_cpus()	1U
 #define num_active_cpus()	1U
 
-static inline bool cpu_online(unsigned int cpu)
+static __always_inline bool cpu_online(unsigned int cpu)
 {
 	return cpu == 0;
 }
 
-static inline bool cpu_possible(unsigned int cpu)
+static __always_inline bool cpu_possible(unsigned int cpu)
 {
 	return cpu == 0;
 }
 
-static inline bool cpu_present(unsigned int cpu)
+static __always_inline bool cpu_present(unsigned int cpu)
 {
 	return cpu == 0;
 }
 
-static inline bool cpu_active(unsigned int cpu)
+static __always_inline bool cpu_active(unsigned int cpu)
 {
 	return cpu == 0;
 }
 
-static inline bool cpu_dying(unsigned int cpu)
+static __always_inline bool cpu_dying(unsigned int cpu)
 {
 	return false;
 }
@@ -1210,7 +1222,7 @@ static inline bool cpu_dying(unsigned int cpu)
  * Return: the length of the (null-terminated) @buf string, zero if
  * nothing is copied.
  */
-static inline ssize_t
+static __always_inline ssize_t
 cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask)
 {
 	return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask),
@@ -1233,9 +1245,9 @@ cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask)
  * Return: the length of how many bytes have been copied, excluding
  * terminating '\0'.
  */
-static inline ssize_t
-cpumap_print_bitmask_to_buf(char *buf, const struct cpumask *mask,
-		loff_t off, size_t count)
+static __always_inline
+ssize_t cpumap_print_bitmask_to_buf(char *buf, const struct cpumask *mask,
+				    loff_t off, size_t count)
 {
 	return bitmap_print_bitmask_to_buf(buf, cpumask_bits(mask),
 				   nr_cpu_ids, off, count) - 1;
@@ -1255,9 +1267,9 @@ cpumap_print_bitmask_to_buf(char *buf, const struct cpumask *mask,
  * Return: the length of how many bytes have been copied, excluding
  * terminating '\0'.
  */
-static inline ssize_t
-cpumap_print_list_to_buf(char *buf, const struct cpumask *mask,
-		loff_t off, size_t count)
+static __always_inline
+ssize_t cpumap_print_list_to_buf(char *buf, const struct cpumask *mask,
+				 loff_t off, size_t count)
 {
 	return bitmap_print_list_to_buf(buf, cpumask_bits(mask),
 				   nr_cpu_ids, off, count) - 1;
-- 
Gitee


From 8e3914d14fc03aae5a224a6d069d8071fc336669 Mon Sep 17 00:00:00 2001
From: "Yury Norov [NVIDIA]" <yury.norov@gmail.com>
Date: Thu, 15 May 2025 16:58:31 +0000
Subject: [PATCH 234/280] cpumask: Relax cpumask_any_but()

ANBZ: #31045

commit 189572bf4e005431051319def435ac4b7e4489ca upstream.

Similarly to other cpumask search functions, accept -1, and consider it as
'any CPU' hint. This helps users to avoid coding special cases.

Intel-SIG: commit 189572bf4e00 cpumask: Relax cpumask_any_but()
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Yury Norov [NVIDIA] <yury.norov@gmail.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: James Morse <james.morse@arm.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Link: https://lore.kernel.org/20250515165855.31452-2-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/cpumask.h | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index fbfd28280470..56f8e0acc264 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -394,14 +394,18 @@ unsigned int __pure cpumask_next_wrap(int n, const struct cpumask *mask, int sta
  * @cpu: the cpu to ignore.
  *
  * Often used to find any cpu but smp_processor_id() in a mask.
+ * If @cpu == -1, the function is equivalent to cpumask_any().
  * Return: >= nr_cpu_ids if no cpus set.
  */
 static __always_inline
-unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
+unsigned int cpumask_any_but(const struct cpumask *mask, int cpu)
 {
 	unsigned int i;
 
-	cpumask_check(cpu);
+	/* -1 is a legal arg here. */
+	if (cpu != -1)
+		cpumask_check(cpu);
+
 	for_each_cpu(i, mask)
 		if (i != cpu)
 			break;
@@ -414,16 +418,20 @@ unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
  * @mask2: the second input cpumask
  * @cpu: the cpu to ignore
  *
+ * If @cpu == -1, the function is equivalent to cpumask_any_and().
  * Returns >= nr_cpu_ids if no cpus set.
  */
 static __always_inline
 unsigned int cpumask_any_and_but(const struct cpumask *mask1,
 				 const struct cpumask *mask2,
-				 unsigned int cpu)
+				 int cpu)
 {
 	unsigned int i;
 
-	cpumask_check(cpu);
+	/* -1 is a legal arg here. */
+	if (cpu != -1)
+		cpumask_check(cpu);
+
 	i = cpumask_first_and(mask1, mask2);
 	if (i != cpu)
 		return i;
-- 
Gitee


From 67b2985aa242ecc4e9aaff1dd9b9a5f19656074b Mon Sep 17 00:00:00 2001
From: "Yury Norov [NVIDIA]" <yury.norov@gmail.com>
Date: Thu, 15 May 2025 16:58:32 +0000
Subject: [PATCH 235/280] find: Add find_first_andnot_bit()

ANBZ: #31045

commit 13f0a02bf4c1c5888c736cedef9ca50de666adb3 upstream.

The function helps to implement cpumask_andnot() APIs.

Intel-SIG: commit 13f0a02bf4c1 find: Add find_first_andnot_bit()
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Yury Norov [NVIDIA] <yury.norov@gmail.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: James Morse <james.morse@arm.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Link: https://lore.kernel.org/20250515165855.31452-3-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/find.h | 25 +++++++++++++++++++++++++
 lib/find_bit.c       | 11 +++++++++++
 2 files changed, 36 insertions(+)

diff --git a/include/linux/find.h b/include/linux/find.h
index a3a908a27df7..96b8410a7cf7 100644
--- a/include/linux/find.h
+++ b/include/linux/find.h
@@ -29,6 +29,8 @@ unsigned long __find_nth_and_andnot_bit(const unsigned long *addr1, const unsign
 					unsigned long n);
 extern unsigned long _find_first_and_bit(const unsigned long *addr1,
 					 const unsigned long *addr2, unsigned long size);
+unsigned long _find_first_andnot_bit(const unsigned long *addr1, const unsigned long *addr2,
+				 unsigned long size);
 unsigned long _find_first_and_and_bit(const unsigned long *addr1, const unsigned long *addr2,
 				      const unsigned long *addr3, unsigned long size);
 extern unsigned long _find_first_zero_bit(const unsigned long *addr, unsigned long size);
@@ -347,6 +349,29 @@ unsigned long find_first_and_bit(const unsigned long *addr1,
 }
 #endif
 
+/**
+ * find_first_andnot_bit - find the first bit set in 1st memory region and unset in 2nd
+ * @addr1: The first address to base the search on
+ * @addr2: The second address to base the search on
+ * @size: The bitmap size in bits
+ *
+ * Returns the bit number for the first set bit
+ * If no bits are set, returns >= @size.
+ */
+static __always_inline
+unsigned long find_first_andnot_bit(const unsigned long *addr1,
+				 const unsigned long *addr2,
+				 unsigned long size)
+{
+	if (small_const_nbits(size)) {
+		unsigned long val = *addr1 & (~*addr2) & GENMASK(size - 1, 0);
+
+		return val ? __ffs(val) : size;
+	}
+
+	return _find_first_andnot_bit(addr1, addr2, size);
+}
+
 /**
  * find_first_and_and_bit - find the first set bit in 3 memory regions
  * @addr1: The first address to base the search on
diff --git a/lib/find_bit.c b/lib/find_bit.c
index dacadd904250..79c36041694a 100644
--- a/lib/find_bit.c
+++ b/lib/find_bit.c
@@ -116,6 +116,17 @@ unsigned long _find_first_and_bit(const unsigned long *addr1,
 EXPORT_SYMBOL(_find_first_and_bit);
 #endif
 
+/*
+ * Find the first bit set in 1st memory region and unset in 2nd.
+ */
+unsigned long _find_first_andnot_bit(const unsigned long *addr1,
+				  const unsigned long *addr2,
+				  unsigned long size)
+{
+	return FIND_FIRST_BIT(addr1[idx] & ~addr2[idx], /* nop */, size);
+}
+EXPORT_SYMBOL(_find_first_andnot_bit);
+
 /*
  * Find the first set bit in three memory regions.
  */
-- 
Gitee


From c4258ff1ae6d1e3e8d4c87413b7a254dd4398467 Mon Sep 17 00:00:00 2001
From: "Yury Norov [NVIDIA]" <yury.norov@gmail.com>
Date: Thu, 15 May 2025 16:58:33 +0000
Subject: [PATCH 236/280] cpumask: Add cpumask_{first,next}_andnot() API

ANBZ: #31045

commit 5da703ef4e4a82b2f9a00f2b3a1eae5657e68a92 upstream.

With the lack of the functions, client code has to abuse less efficient
cpumask_nth().

Intel-SIG: commit 5da703ef4e4a cpumask: Add cpumask_{first,next}_andnot() API
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Yury Norov [NVIDIA] <yury.norov@gmail.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: James Morse <james.morse@arm.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-4-james.morse@arm.com

 Conflicts:
	include/linux/cpumask.h
[jz: resolve context conflict]
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/cpumask.h | 59 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 56f8e0acc264..afd540f32101 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -186,6 +186,19 @@ unsigned int cpumask_first_and(const struct cpumask *srcp1, const struct cpumask
 	return find_first_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits);
 }
 
+/**
+ * cpumask_first_andnot - return the first cpu from *srcp1 & ~*srcp2
+ * @srcp1: the first input
+ * @srcp2: the second input
+ *
+ * Return: >= nr_cpu_ids if no such cpu found.
+ */
+static __always_inline
+unsigned int cpumask_first_andnot(const struct cpumask *srcp1, const struct cpumask *srcp2)
+{
+	return find_first_andnot_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits);
+}
+
 /**
  * cpumask_first_and_and - return the first cpu from *srcp1 & *srcp2 & *srcp3
  * @srcp1: the first input
@@ -292,6 +305,25 @@ unsigned int cpumask_next_and(int n, const struct cpumask *src1p,
 		small_cpumask_bits, n + 1);
 }
 
+/**
+ * cpumask_next_andnot - get the next cpu in *src1p & ~*src2p
+ * @n: the cpu prior to the place to search (i.e. return will be > @n)
+ * @src1p: the first cpumask pointer
+ * @src2p: the second cpumask pointer
+ *
+ * Return: >= nr_cpu_ids if no further cpus set in both.
+ */
+static __always_inline
+unsigned int cpumask_next_andnot(int n, const struct cpumask *src1p,
+				 const struct cpumask *src2p)
+{
+	/* -1 is a legal arg here. */
+	if (n != -1)
+		cpumask_check(n);
+	return find_next_andnot_bit(cpumask_bits(src1p), cpumask_bits(src2p),
+		small_cpumask_bits, n + 1);
+}
+
 /**
  * for_each_cpu - iterate over every cpu in a mask
  * @cpu: the (optionally unsigned) integer iterator
@@ -439,6 +471,33 @@ unsigned int cpumask_any_and_but(const struct cpumask *mask1,
 	return cpumask_next_and(cpu, mask1, mask2);
 }
 
+/**
+ * cpumask_any_andnot_but - pick an arbitrary cpu from *mask1 & ~*mask2, but not this one.
+ * @mask1: the first input cpumask
+ * @mask2: the second input cpumask
+ * @cpu: the cpu to ignore
+ *
+ * If @cpu == -1, the function returns the first matching cpu.
+ * Returns >= nr_cpu_ids if no cpus set.
+ */
+static __always_inline
+unsigned int cpumask_any_andnot_but(const struct cpumask *mask1,
+				    const struct cpumask *mask2,
+				    int cpu)
+{
+	unsigned int i;
+
+	/* -1 is a legal arg here. */
+	if (cpu != -1)
+		cpumask_check(cpu);
+
+	i = cpumask_first_andnot(mask1, mask2);
+	if (i != cpu)
+		return i;
+
+	return cpumask_next_andnot(cpu, mask1, mask2);
+}
+
 /**
  * cpumask_nth - get the Nth cpu in a cpumask
  * @srcp: the cpumask pointer
-- 
Gitee


From 8a62e5b6252fb108d84d266fba77edf0b60c22cd Mon Sep 17 00:00:00 2001
From: "Yury Norov [NVIDIA]" <yury.norov@gmail.com>
Date: Thu, 15 May 2025 16:58:34 +0000
Subject: [PATCH 237/280] x86/resctrl: Optimize cpumask_any_housekeeping()

ANBZ: #31045

commit 94f7531430285b4ec600693f7222c2ca29bd7472 upstream.

With the lack of cpumask_any_andnot_but(), cpumask_any_housekeeping()
has to abuse cpumask_nth() functions.

Update cpumask_any_housekeeping() to use the new cpumask_any_but()
and cpumask_any_andnot_but(). These two functions understand
RESCTRL_PICK_ANY_CPU, which simplifies cpumask_any_housekeeping()
significantly.

Intel-SIG: commit 94f753143028 x86/resctrl: Optimize cpumask_any_housekeeping()
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Yury Norov [NVIDIA] <yury.norov@gmail.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: James Morse <james.morse@arm.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-5-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h | 28 +++++++-------------------
 1 file changed, 7 insertions(+), 21 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index c44c5b496355..321e9afa74c5 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -47,30 +47,16 @@
 static inline unsigned int
 cpumask_any_housekeeping(const struct cpumask *mask, int exclude_cpu)
 {
-	unsigned int cpu, hk_cpu;
-
-	if (exclude_cpu == RESCTRL_PICK_ANY_CPU)
-		cpu = cpumask_any(mask);
-	else
-		cpu = cpumask_any_but(mask, exclude_cpu);
-
-	/* Only continue if tick_nohz_full_mask has been initialized. */
-	if (!tick_nohz_full_enabled())
-		return cpu;
-
-	/* If the CPU picked isn't marked nohz_full nothing more needs doing. */
-	if (cpu < nr_cpu_ids && !tick_nohz_full_cpu(cpu))
-		return cpu;
+	unsigned int cpu;
 
 	/* Try to find a CPU that isn't nohz_full to use in preference */
-	hk_cpu = cpumask_nth_andnot(0, mask, tick_nohz_full_mask);
-	if (hk_cpu == exclude_cpu)
-		hk_cpu = cpumask_nth_andnot(1, mask, tick_nohz_full_mask);
-
-	if (hk_cpu < nr_cpu_ids)
-		cpu = hk_cpu;
+	if (tick_nohz_full_enabled()) {
+		cpu = cpumask_any_andnot_but(mask, tick_nohz_full_mask, exclude_cpu);
+		if (cpu < nr_cpu_ids)
+			return cpu;
+	}
 
-	return cpu;
+	return cpumask_any_but(mask, exclude_cpu);
 }
 
 struct rdt_fs_context {
-- 
Gitee


From d39997d3b8024303c7b1bb2c8b3c7648f7daa655 Mon Sep 17 00:00:00 2001
From: Amit Singh Tomar <amitsinght@marvell.com>
Date: Thu, 15 May 2025 16:58:35 +0000
Subject: [PATCH 238/280] x86/resctrl: Remove the limit on the number of CLOSID

ANBZ: #31045

commit dcb1d3d3b77bdb30d2ec97f540d58ee35f1b1c82 upstream.

Resctrl allocates and finds free CLOSID values using the bits of a u32.
This restricts the number of control groups that can be created by
user-space.

MPAM has an architectural limit of 2^16 CLOSID values, Intel x86 could
be extended beyond 32 values. There is at least one MPAM platform which
supports more than 32 CLOSID values.

Replace the fixed size bitmap with calls to the bitmap API to allocate
an array of a sufficient size.

ffs() returns '1' for bit 0, hence the existing code subtracts 1 from
the index to get the CLOSID value. find_first_bit() returns the bit
number which does not need adjusting.

  [ morse: fixed the off-by-one in the allocator and the wrong not-found
    value. Removed the limit. Rephrase the commit message. ]

Intel-SIG: commit dcb1d3d3b77b x86/resctrl: Remove the limit on the number of CLOSID
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Amit Singh Tomar <amitsinght@marvell.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-6-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 51 ++++++++++++++++++--------
 1 file changed, 35 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index c6274d40b217..26eee6dc060b 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -130,8 +130,8 @@ static bool resctrl_is_mbm_event(int e)
 }
 
 /*
- * Trivial allocator for CLOSIDs. Since h/w only supports a small number,
- * we can keep a bitmap of free CLOSIDs in a single integer.
+ * Trivial allocator for CLOSIDs. Use BITMAP APIs to manipulate a bitmap
+ * of free CLOSIDs.
  *
  * Using a global CLOSID across all resources has some advantages and
  * some drawbacks:
@@ -144,7 +144,7 @@ static bool resctrl_is_mbm_event(int e)
  * - Our choices on how to configure each resource become progressively more
  *   limited as the number of resources grows.
  */
-static unsigned long closid_free_map;
+static unsigned long *closid_free_map;
 static int closid_free_map_len;
 
 int closids_supported(void)
@@ -152,20 +152,35 @@ int closids_supported(void)
 	return closid_free_map_len;
 }
 
-static void closid_init(void)
+static int closid_init(void)
 {
 	struct resctrl_schema *s;
-	u32 rdt_min_closid = 32;
+	u32 rdt_min_closid = ~0;
+
+	/* Monitor only platforms still call closid_init() */
+	if (list_empty(&resctrl_schema_all))
+		return 0;
 
 	/* Compute rdt_min_closid across all resources */
 	list_for_each_entry(s, &resctrl_schema_all, list)
 		rdt_min_closid = min(rdt_min_closid, s->num_closid);
 
-	closid_free_map = BIT_MASK(rdt_min_closid) - 1;
+	closid_free_map = bitmap_alloc(rdt_min_closid, GFP_KERNEL);
+	if (!closid_free_map)
+		return -ENOMEM;
+	bitmap_fill(closid_free_map, rdt_min_closid);
 
 	/* RESCTRL_RESERVED_CLOSID is always reserved for the default group */
-	__clear_bit(RESCTRL_RESERVED_CLOSID, &closid_free_map);
+	__clear_bit(RESCTRL_RESERVED_CLOSID, closid_free_map);
 	closid_free_map_len = rdt_min_closid;
+
+	return 0;
+}
+
+static void closid_exit(void)
+{
+	bitmap_free(closid_free_map);
+	closid_free_map = NULL;
 }
 
 static int closid_alloc(void)
@@ -182,12 +197,11 @@ static int closid_alloc(void)
 			return cleanest_closid;
 		closid = cleanest_closid;
 	} else {
-		closid = ffs(closid_free_map);
-		if (closid == 0)
+		closid = find_first_bit(closid_free_map, closid_free_map_len);
+		if (closid == closid_free_map_len)
 			return -ENOSPC;
-		closid--;
 	}
-	__clear_bit(closid, &closid_free_map);
+	__clear_bit(closid, closid_free_map);
 
 	return closid;
 }
@@ -196,7 +210,7 @@ void closid_free(int closid)
 {
 	lockdep_assert_held(&rdtgroup_mutex);
 
-	__set_bit(closid, &closid_free_map);
+	__set_bit(closid, closid_free_map);
 }
 
 /**
@@ -210,7 +224,7 @@ bool closid_allocated(unsigned int closid)
 {
 	lockdep_assert_held(&rdtgroup_mutex);
 
-	return !test_bit(closid, &closid_free_map);
+	return !test_bit(closid, closid_free_map);
 }
 
 /**
@@ -2754,20 +2768,22 @@ static int rdt_get_tree(struct fs_context *fc)
 		goto out_ctx;
 	}
 
-	closid_init();
+	ret = closid_init();
+	if (ret)
+		goto out_schemata_free;
 
 	if (resctrl_arch_mon_capable())
 		flags |= RFTYPE_MON;
 
 	ret = rdtgroup_add_files(rdtgroup_default.kn, flags);
 	if (ret)
-		goto out_schemata_free;
+		goto out_closid_exit;
 
 	kernfs_activate(rdtgroup_default.kn);
 
 	ret = rdtgroup_create_info_dir(rdtgroup_default.kn);
 	if (ret < 0)
-		goto out_schemata_free;
+		goto out_closid_exit;
 
 	if (resctrl_arch_mon_capable()) {
 		ret = mongroup_create_dir(rdtgroup_default.kn,
@@ -2818,6 +2834,8 @@ static int rdt_get_tree(struct fs_context *fc)
 		kernfs_remove(kn_mongrp);
 out_info:
 	kernfs_remove(kn_info);
+out_closid_exit:
+	closid_exit();
 out_schemata_free:
 	schemata_list_destroy();
 out_ctx:
@@ -3065,6 +3083,7 @@ static void rdt_kill_sb(struct super_block *sb)
 	rmdir_all_sub();
 	rdt_pseudo_lock_release();
 	rdtgroup_default.mode = RDT_MODE_SHAREABLE;
+	closid_exit();
 	schemata_list_destroy();
 	rdtgroup_destroy_root();
 	if (resctrl_arch_alloc_capable())
-- 
Gitee


From 8a277412d47a693e9897eb2b8313e16f9bad645d Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:36 +0000
Subject: [PATCH 239/280] x86/resctrl: Rename resctrl_sched_in() to begin with
 "resctrl_arch_"

ANBZ: #31045

commit 7704fb81bc87254e8772f387b62153b135bb1932 upstream.

resctrl_sched_in() loads the architecture specific CPU MSRs with the
CLOSID and RMID values. This function was named before resctrl was
split to have architecture specific code, and generic filesystem code.

This function is obviously architecture specific, but does not begin
with 'resctrl_arch_', making it the odd one out in the functions an
architecture needs to support to enable resctrl.

Rename it for consistency. This is purely cosmetic.

Intel-SIG: commit 7704fb81bc87 x86/resctrl: Rename resctrl_sched_in() to begin with "resctrl_arch_"
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-7-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h         |  4 ++--
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 12 ++++++------
 arch/x86/kernel/process_32.c           |  2 +-
 arch/x86/kernel/process_64.c           |  2 +-
 4 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 011bf67a1866..7a39728b0743 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -175,7 +175,7 @@ static inline bool resctrl_arch_match_rmid(struct task_struct *tsk, u32 ignored,
 	return READ_ONCE(tsk->rmid) == rmid;
 }
 
-static inline void resctrl_sched_in(struct task_struct *tsk)
+static inline void resctrl_arch_sched_in(struct task_struct *tsk)
 {
 	if (static_branch_likely(&rdt_enable_key))
 		__resctrl_sched_in(tsk);
@@ -212,7 +212,7 @@ void resctrl_cpu_detect(struct cpuinfo_x86 *c);
 
 #else
 
-static inline void resctrl_sched_in(struct task_struct *tsk) {}
+static inline void resctrl_arch_sched_in(struct task_struct *tsk) {}
 static inline void resctrl_cpu_detect(struct cpuinfo_x86 *c) {}
 
 #endif /* CONFIG_X86_CPU_RESCTRL */
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 26eee6dc060b..2d5e25d124a3 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -376,7 +376,7 @@ static int rdtgroup_cpus_show(struct kernfs_open_file *of,
 }
 
 /*
- * This is safe against resctrl_sched_in() called from __switch_to()
+ * This is safe against resctrl_arch_sched_in() called from __switch_to()
  * because __switch_to() is executed with interrupts disabled. A local call
  * from update_closid_rmid() is protected against __switch_to() because
  * preemption is disabled.
@@ -395,7 +395,7 @@ void resctrl_arch_sync_cpu_closid_rmid(void *info)
 	 * executing task might have its own closid selected. Just reuse
 	 * the context switch code.
 	 */
-	resctrl_sched_in(current);
+	resctrl_arch_sched_in(current);
 }
 
 /*
@@ -620,7 +620,7 @@ static void _update_task_closid_rmid(void *task)
 	 * Otherwise, the MSR is updated when the task is scheduled in.
 	 */
 	if (task == current)
-		resctrl_sched_in(task);
+		resctrl_arch_sched_in(task);
 }
 
 static void update_task_closid_rmid(struct task_struct *t)
@@ -678,7 +678,7 @@ static int __rdtgroup_move_task(struct task_struct *tsk,
 	 * Ensure the task's closid and rmid are written before determining if
 	 * the task is current that will decide if it will be interrupted.
 	 * This pairs with the full barrier between the rq->curr update and
-	 * resctrl_sched_in() during context switch.
+	 * resctrl_arch_sched_in() during context switch.
 	 */
 	smp_mb();
 
@@ -2983,8 +2983,8 @@ static void rdt_move_group_tasks(struct rdtgroup *from, struct rdtgroup *to,
 			/*
 			 * Order the closid/rmid stores above before the loads
 			 * in task_curr(). This pairs with the full barrier
-			 * between the rq->curr update and resctrl_sched_in()
-			 * during context switch.
+			 * between the rq->curr update and
+			 * resctrl_arch_sched_in() during context switch.
 			 */
 			smp_mb();
 
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 708c87b88cc1..619560eb9f94 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -212,7 +212,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
 	switch_fpu_finish();
 
 	/* Load the Intel cache allocation PQR MSR. */
-	resctrl_sched_in(next_p);
+	resctrl_arch_sched_in(next_p);
 
 	return prev_p;
 }
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 5fee1e0c42ca..fbadfa84a02d 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -667,7 +667,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
 	}
 
 	/* Load the Intel cache allocation PQR MSR. */
-	resctrl_sched_in(next_p);
+	resctrl_arch_sched_in(next_p);
 
 	return prev_p;
 }
-- 
Gitee


From 183ac70dd5007337634403f6d2fd15eefe9c2da5 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:37 +0000
Subject: [PATCH 240/280] x86/resctrl: Check all domains are offline in
 resctrl_exit()

ANBZ: #31045

commit 8eb7ad66badc71e0d8547cf6195a2a6190090152 upstream.

resctrl_exit() removes things like the resctrl mount point directory
and unregisters the filesystem prior to freeing data structures that
were allocated during resctrl_init().

This assumes that there are no online domains when resctrl_exit() is
called. If any domain were online, the limbo or overflow handler could
be scheduled to run.

Add a check for any online control or monitor domains, and document that
the architecture code is required to offline all monitor and control
domains before calling resctrl_exit().

Intel-SIG: commit 8eb7ad66badc x86/resctrl: Check all domains are offline in resctrl_exit()
Backport Resctrl/RDT-SNC for Intel platforms

Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-8-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 33 ++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 2d5e25d124a3..60c877240950 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4391,8 +4391,41 @@ int __init resctrl_init(void)
 	return ret;
 }
 
+static bool __exit resctrl_online_domains_exist(void)
+{
+	struct rdt_resource *r;
+
+	/*
+	 * Only walk capable resources to allow resctrl_arch_get_resource()
+	 * to return dummy 'not capable' resources.
+	 */
+	for_each_alloc_capable_rdt_resource(r) {
+		if (!list_empty(&r->ctrl_domains))
+			return true;
+	}
+
+	for_each_mon_capable_rdt_resource(r) {
+		if (!list_empty(&r->mon_domains))
+			return true;
+	}
+
+	return false;
+}
+
+/*
+ * resctrl_exit() - Remove the resctrl filesystem and free resources.
+ *
+ * When called by the architecture code, all CPUs and resctrl domains must be
+ * offline. This ensures the limbo and overflow handlers are not scheduled to
+ * run, meaning the data structures they access can be freed by
+ * resctrl_mon_resource_exit().
+ */
 void __exit resctrl_exit(void)
 {
+	cpus_read_lock();
+	WARN_ON_ONCE(resctrl_online_domains_exist());
+	cpus_read_unlock();
+
 	debugfs_remove_recursive(debugfs_resctrl);
 	unregister_filesystem(&rdt_fs_type);
 	sysfs_remove_mount_point(fs_kobj, "resctrl");
-- 
Gitee


From 124041df2abc4c6da2b7696d0b0f7bc3f9868bad Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:38 +0000
Subject: [PATCH 241/280] x86/resctrl: Resctrl_exit() teardown resctrl but
 leave the mount point

ANBZ: #31045

commit 8c992e24a0627a6ba508184c07766862c8bb3e54 upstream.

resctrl_exit() was intended for use when the 'resctrl' module was unloaded.
resctrl can't be built as a module, and the kernfs helpers are not exported so
this is unlikely to change. MPAM has an error interrupt which indicates the
MPAM driver has gone haywire. Should this occur tasks could run with the wrong
control values, leading to bad performance for important tasks.  In this
scenario the MPAM driver will reset the hardware, but it needs a way to tell
resctrl that no further configuration should be attempted.

In particular, moving tasks between control or monitor groups does not
interact with the architecture code, so there is no opportunity for the arch
code to indicate that the hardware is no-longer functioning.

Using resctrl_exit() for this leaves the system in a funny state as resctrl is
still mounted, but cannot be un-mounted because the sysfs directory that is
typically used has been removed. Dave Martin suggests this may cause systemd
trouble in the future as not all filesystems can be unmounted.

Add calls to remove all the files and directories in resctrl, and remove the
sysfs_remove_mount_point() call that leaves the system in a funny state. When
triggered, this causes all the resctrl files to disappear. resctrl can be
unmounted, but not mounted again.

Intel-SIG: commit 8c992e24a062 x86/resctrl: Resctrl_exit() teardown resctrl but leave the mount point
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-9-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 48 +++++++++++++++++++++-----
 1 file changed, 40 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 60c877240950..dd7e7a10e27e 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -3067,6 +3067,22 @@ static void rmdir_all_sub(void)
 	kernfs_remove(kn_mondata);
 }
 
+static void resctrl_fs_teardown(void)
+{
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	/* Cleared by rdtgroup_destroy_root() */
+	if (!rdtgroup_default.kn)
+		return;
+
+	rmdir_all_sub();
+	rdt_pseudo_lock_release();
+	rdtgroup_default.mode = RDT_MODE_SHAREABLE;
+	closid_exit();
+	schemata_list_destroy();
+	rdtgroup_destroy_root();
+}
+
 static void rdt_kill_sb(struct super_block *sb)
 {
 	struct rdt_resource *r;
@@ -3080,12 +3096,7 @@ static void rdt_kill_sb(struct super_block *sb)
 	for_each_alloc_capable_rdt_resource(r)
 		resctrl_arch_reset_all_ctrls(r);
 
-	rmdir_all_sub();
-	rdt_pseudo_lock_release();
-	rdtgroup_default.mode = RDT_MODE_SHAREABLE;
-	closid_exit();
-	schemata_list_destroy();
-	rdtgroup_destroy_root();
+	resctrl_fs_teardown();
 	if (resctrl_arch_alloc_capable())
 		resctrl_arch_disable_alloc();
 	if (resctrl_arch_mon_capable())
@@ -4098,6 +4109,8 @@ static int rdtgroup_setup_root(struct rdt_fs_context *ctx)
 
 static void rdtgroup_destroy_root(void)
 {
+	lockdep_assert_held(&rdtgroup_mutex);
+
 	kernfs_destroy_root(rdt_root);
 	rdtgroup_default.kn = NULL;
 }
@@ -4412,23 +4425,42 @@ static bool __exit resctrl_online_domains_exist(void)
 	return false;
 }
 
-/*
+/**
  * resctrl_exit() - Remove the resctrl filesystem and free resources.
  *
+ * Called by the architecture code in response to a fatal error.
+ * Removes resctrl files and structures from kernfs to prevent further
+ * configuration.
+ *
  * When called by the architecture code, all CPUs and resctrl domains must be
  * offline. This ensures the limbo and overflow handlers are not scheduled to
  * run, meaning the data structures they access can be freed by
  * resctrl_mon_resource_exit().
+ *
+ * After resctrl_exit() returns, the architecture code should return an
+ * error from all resctrl_arch_ functions that can do this.
+ * resctrl_arch_get_resource() must continue to return struct rdt_resources
+ * with the correct rid field to ensure the filesystem can be unmounted.
  */
 void __exit resctrl_exit(void)
 {
 	cpus_read_lock();
 	WARN_ON_ONCE(resctrl_online_domains_exist());
+
+	mutex_lock(&rdtgroup_mutex);
+	resctrl_fs_teardown();
+	mutex_unlock(&rdtgroup_mutex);
+
 	cpus_read_unlock();
 
 	debugfs_remove_recursive(debugfs_resctrl);
+	debugfs_resctrl = NULL;
 	unregister_filesystem(&rdt_fs_type);
-	sysfs_remove_mount_point(fs_kobj, "resctrl");
+
+	/*
+	 * Do not remove the sysfs mount point added by resctrl_init() so that
+	 * it can be used to umount resctrl.
+	 */
 
 	resctrl_mon_resource_exit();
 }
-- 
Gitee


From bbd74fbdfb6fdd64d827c7ea2b226bf7745b16f2 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:39 +0000
Subject: [PATCH 242/280] x86/resctrl: Drop __init/__exit on assorted symbols

ANBZ: #31045

commit bc740420d7ae7878696d5ad9f3dbcb11e2599b2e upstream.

Because ARM's MPAM controls are probed using MMIO, resctrl can't be
initialised until enough CPUs are online to have determined the system-wide
supported num_closid. Arm64 also supports 'late onlined secondaries', where
only a subset of CPUs are online during boot.

These two combine to mean the MPAM driver may not be able to initialise
resctrl until user-space has brought 'enough' CPUs online.

To allow MPAM to initialise resctrl after __init text has been free'd, remove
all the __init markings from resctrl.

The existing __exit markings cause these functions to be removed by the linker
as it has never been possible to build resctrl as a module. MPAM has an error
interrupt which causes the driver to reset and disable itself. Remove the
__exit markings to allow the MPAM driver to tear down resctrl when an error
occurs.

Intel-SIG: commit bc740420d7ae x86/resctrl: Drop __init/__exit on assorted symbols
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-10-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     | 6 +++---
 arch/x86/kernel/cpu/resctrl/internal.h | 4 ++--
 arch/x86/kernel/cpu/resctrl/monitor.c  | 2 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 8 ++++----
 include/linux/resctrl.h                | 6 +++---
 5 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index cf29681d01e0..31538c65d9a2 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -737,7 +737,7 @@ struct rdt_options {
 	bool	force_off, force_on;
 };
 
-static struct rdt_options rdt_options[]  __initdata = {
+static struct rdt_options rdt_options[]  __ro_after_init = {
 	RDT_OPT(RDT_FLAG_CMT,	    "cmt",	X86_FEATURE_CQM_OCCUP_LLC),
 	RDT_OPT(RDT_FLAG_MBM_TOTAL, "mbmtotal", X86_FEATURE_CQM_MBM_TOTAL),
 	RDT_OPT(RDT_FLAG_MBM_LOCAL, "mbmlocal", X86_FEATURE_CQM_MBM_LOCAL),
@@ -777,7 +777,7 @@ static int __init set_rdt_options(char *str)
 }
 __setup("rdt", set_rdt_options);
 
-bool __init rdt_cpu_has(int flag)
+bool rdt_cpu_has(int flag)
 {
 	bool ret = boot_cpu_has(flag);
 	struct rdt_options *o;
@@ -797,7 +797,7 @@ bool __init rdt_cpu_has(int flag)
 	return ret;
 }
 
-__init bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt)
+bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt)
 {
 	if (!rdt_cpu_has(X86_FEATURE_BMEC))
 		return false;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 321e9afa74c5..de677947b256 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -467,13 +467,13 @@ int alloc_rmid(u32 closid);
 void free_rmid(u32 closid, u32 rmid);
 int rdt_get_mon_l3_config(struct rdt_resource *r);
 void resctrl_mon_resource_exit(void);
-bool __init rdt_cpu_has(int flag);
+bool rdt_cpu_has(int flag);
 void mon_event_count(void *info);
 int rdtgroup_mondata_show(struct seq_file *m, void *arg);
 void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 		    struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
 		    cpumask_t *cpumask, int evtid, int first);
-int __init resctrl_mon_resource_init(void);
+int resctrl_mon_resource_init(void);
 void mbm_setup_overflow_handler(struct rdt_mon_domain *dom,
 				unsigned long delay_ms,
 				int exclude_cpu);
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index a93ed7d2a160..73e3fe4f4c87 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -1204,7 +1204,7 @@ static __init int snc_get_config(void)
  *
  * Returns 0 for success, or -ENOMEM.
  */
-int __init resctrl_mon_resource_init(void)
+int resctrl_mon_resource_init(void)
 {
 	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
 	int ret;
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index dd7e7a10e27e..e38451660898 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4115,7 +4115,7 @@ static void rdtgroup_destroy_root(void)
 	rdtgroup_default.kn = NULL;
 }
 
-static void __init rdtgroup_setup_default(void)
+static void rdtgroup_setup_default(void)
 {
 	mutex_lock(&rdtgroup_mutex);
 
@@ -4347,7 +4347,7 @@ void resctrl_offline_cpu(unsigned int cpu)
  *
  * Return: 0 on success or -errno
  */
-int __init resctrl_init(void)
+int resctrl_init(void)
 {
 	int ret = 0;
 
@@ -4404,7 +4404,7 @@ int __init resctrl_init(void)
 	return ret;
 }
 
-static bool __exit resctrl_online_domains_exist(void)
+static bool resctrl_online_domains_exist(void)
 {
 	struct rdt_resource *r;
 
@@ -4442,7 +4442,7 @@ static bool __exit resctrl_online_domains_exist(void)
  * resctrl_arch_get_resource() must continue to return struct rdt_resources
  * with the correct rid field to ensure the filesystem can be unmounted.
  */
-void __exit resctrl_exit(void)
+void resctrl_exit(void)
 {
 	cpus_read_lock();
 	WARN_ON_ONCE(resctrl_online_domains_exist());
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 880351ca3dfc..b8f8240050b4 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -358,7 +358,7 @@ u32 resctrl_arch_get_num_closid(struct rdt_resource *r);
 u32 resctrl_arch_system_num_rmid_idx(void);
 int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid);
 
-__init bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt);
+bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt);
 
 /**
  * resctrl_arch_mon_event_config_write() - Write the config for an event.
@@ -514,7 +514,7 @@ void resctrl_arch_reset_all_ctrls(struct rdt_resource *r);
 extern unsigned int resctrl_rmid_realloc_threshold;
 extern unsigned int resctrl_rmid_realloc_limit;
 
-int __init resctrl_init(void);
-void __exit resctrl_exit(void);
+int resctrl_init(void);
+void resctrl_exit(void);
 
 #endif /* _RESCTRL_H */
-- 
Gitee


From 49fb67a01b862d5a7b220537a75ab52d2bf971cf Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:40 +0000
Subject: [PATCH 243/280] x86/resctrl: Move is_mba_sc() out of core.c

ANBZ: #31045

commit 6c72fb8d8bd7bfaafdeda3a91c535ecf52283ec9 upstream.

is_mba_sc() is defined in core.c, but has no callers there. It does not access
any architecture private structures.

Move this to rdtgroup.c where the majority of callers are. This makes the move
of the filesystem code to /fs/ cleaner.

Intel-SIG: commit 6c72fb8d8bd7 x86/resctrl: Move is_mba_sc() out of core.c
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-11-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c     | 15 ---------------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 15 +++++++++++++++
 2 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 31538c65d9a2..58d7c6accdf2 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -164,21 +164,6 @@ static inline void cache_alloc_hsw_probe(void)
 	rdt_alloc_capable = true;
 }
 
-bool is_mba_sc(struct rdt_resource *r)
-{
-	if (!r)
-		r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-
-	/*
-	 * The software controller support is only applicable to MBA resource.
-	 * Make sure to check for resource type.
-	 */
-	if (r->rid != RDT_RESOURCE_MBA)
-		return false;
-
-	return r->membw.mba_sc;
-}
-
 /*
  * rdt_get_mb_table() - get a mapping of bandwidth(b/w) percentage values
  * exposed to user interface and the h/w understandable delay values.
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index e38451660898..cf51a8e47864 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1525,6 +1525,21 @@ unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
 	return size;
 }
 
+bool is_mba_sc(struct rdt_resource *r)
+{
+	if (!r)
+		r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+
+	/*
+	 * The software controller support is only applicable to MBA resource.
+	 * Make sure to check for resource type.
+	 */
+	if (r->rid != RDT_RESOURCE_MBA)
+		return false;
+
+	return r->membw.mba_sc;
+}
+
 /*
  * rdtgroup_size_show - Display size in bytes of allocated regions
  *
-- 
Gitee


From 9d6d5e0f78110d2c681b7574174e4ac0f22d5862 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:41 +0000
Subject: [PATCH 244/280] x86/resctrl: Add end-marker to the resctrl_event_id
 enum

ANBZ: #31045

commit d4fb6b8e4640adeff9673ae398525be7382d3197 upstream.

The resctrl_event_id enum gives names to the counter event numbers on x86.
These are used directly by resctrl.

To allow the MPAM driver to keep an array of these the size of the enum
needs to be known.

Add a 'num_events' enum entry which can be used to size an array.  This is
added to the enum to reduce conflicts with another series, which in turn
requires get_arch_mbm_state() to have a default case.

Intel-SIG: commit d4fb6b8e4640 x86/resctrl: Add end-marker to the resctrl_event_id enum
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-12-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/monitor.c | 9 ++++-----
 include/linux/resctrl_types.h         | 3 +++
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 73e3fe4f4c87..4962ae4bc596 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -260,12 +260,11 @@ static struct arch_mbm_state *get_arch_mbm_state(struct rdt_hw_mon_domain *hw_do
 		return &hw_dom->arch_mbm_total[rmid];
 	case QOS_L3_MBM_LOCAL_EVENT_ID:
 		return &hw_dom->arch_mbm_local[rmid];
+	default:
+		/* Never expect to get here */
+		WARN_ON_ONCE(1);
+		return NULL;
 	}
-
-	/* Never expect to get here */
-	WARN_ON_ONCE(1);
-
-	return NULL;
 }
 
 void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_mon_domain *d,
diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h
index f26450b3326b..69bf740130ac 100644
--- a/include/linux/resctrl_types.h
+++ b/include/linux/resctrl_types.h
@@ -49,6 +49,9 @@ enum resctrl_event_id {
 	QOS_L3_OCCUP_EVENT_ID		= 0x01,
 	QOS_L3_MBM_TOTAL_EVENT_ID	= 0x02,
 	QOS_L3_MBM_LOCAL_EVENT_ID	= 0x03,
+
+	/* Must be the last */
+	QOS_NUM_EVENTS,
 };
 
 #endif /* __LINUX_RESCTRL_TYPES_H */
-- 
Gitee


From b77a42a81acf2161b06cf505acae917cb8a7af3c Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:42 +0000
Subject: [PATCH 245/280] x86/resctrl: Expand the width of domid by replacing
 mon_data_bits

ANBZ: #31045

commit 2a65660385444e9d9deffe995c71ee20443ef76e upstream.

MPAM platforms retrieve the cache-id property from the ACPI PPTT table.
The cache-id field is 32 bits wide. Under resctrl, the cache-id becomes
the domain-id, and is packed into the mon_data_bits union bitfield.
The width of cache-id in this field is 14 bits.

Expanding the union would break 32bit x86 platforms as this union is
stored as the kernfs kn->priv pointer. This saved allocating memory
for the priv data storage.

The firmware on MPAM platforms have used the PPTT cache-id field to
expose the interconnect's id for the cache, which is sparse and uses
more than 14 bits. Use of this id is to enable PCIe direct cache
injection hints. Using this feature with VFIO means the value provided
by the ACPI table should be exposed to user-space.

To support cache-id values greater than 14 bits, convert the
mon_data_bits union to a structure. These are shared between control
and monitor groups, and are allocated on first use. The list of
allocated struct mon_data is free'd when the filesystem is umount()ed.

Intel-SIG: commit 2a6566038544 x86/resctrl: Expand the width of domid by replacing mon_data_bits
Backport Resctrl/RDT-SNC for Intel platforms

Co-developed-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-13-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 24 ++++---
 arch/x86/kernel/cpu/resctrl/internal.h    | 39 ++++++-----
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 79 +++++++++++++++++++++--
 3 files changed, 106 insertions(+), 36 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 0a0ac5f6112e..110b534d400c 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -661,14 +661,15 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 {
 	struct kernfs_open_file *of = m->private;
+	enum resctrl_res_level resid;
+	enum resctrl_event_id evtid;
 	struct rdt_domain_hdr *hdr;
 	struct rmid_read rr = {0};
 	struct rdt_mon_domain *d;
-	u32 resid, evtid, domid;
 	struct rdtgroup *rdtgrp;
 	struct rdt_resource *r;
-	union mon_data_bits md;
-	int ret = 0;
+	struct mon_data *md;
+	int domid, ret = 0;
 
 	rdtgrp = rdtgroup_kn_lock_live(of->kn);
 	if (!rdtgrp) {
@@ -676,17 +677,22 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 		goto out;
 	}
 
-	md.priv = of->kn->priv;
-	resid = md.u.rid;
-	domid = md.u.domid;
-	evtid = md.u.evtid;
+	md = of->kn->priv;
+	if (WARN_ON_ONCE(!md)) {
+		ret = -EIO;
+		goto out;
+	}
+
+	resid = md->rid;
+	domid = md->domid;
+	evtid = md->evtid;
 	r = resctrl_arch_get_resource(resid);
 
-	if (md.u.sum) {
+	if (md->sum) {
 		/*
 		 * This file requires summing across all domains that share
 		 * the L3 cache id that was provided in the "domid" field of the
-		 * mon_data_bits union. Search all domains in the resource for
+		 * struct mon_data. Search all domains in the resource for
 		 * one that matches this cache id.
 		 */
 		list_for_each_entry(d, &r->mon_domains, hdr.list) {
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index de677947b256..185e4637a804 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -89,27 +89,26 @@ struct mon_evt {
 };
 
 /**
- * union mon_data_bits - Monitoring details for each event file.
- * @priv:              Used to store monitoring event data in @u
- *                     as kernfs private data.
- * @u.rid:             Resource id associated with the event file.
- * @u.evtid:           Event id associated with the event file.
- * @u.sum:             Set when event must be summed across multiple
- *                     domains.
- * @u.domid:           When @u.sum is zero this is the domain to which
- *                     the event file belongs. When @sum is one this
- *                     is the id of the L3 cache that all domains to be
- *                     summed share.
- * @u:                 Name of the bit fields struct.
+ * struct mon_data - Monitoring details for each event file.
+ * @list:            Member of the global @mon_data_kn_priv_list list.
+ * @rid:             Resource id associated with the event file.
+ * @evtid:           Event id associated with the event file.
+ * @sum:             Set when event must be summed across multiple
+ *                   domains.
+ * @domid:           When @sum is zero this is the domain to which
+ *                   the event file belongs. When @sum is one this
+ *                   is the id of the L3 cache that all domains to be
+ *                   summed share.
+ *
+ * Pointed to by the kernfs kn->priv field of monitoring event files.
+ * Readers and writers must hold rdtgroup_mutex.
  */
-union mon_data_bits {
-	void *priv;
-	struct {
-		unsigned int rid		: 10;
-		enum resctrl_event_id evtid	: 7;
-		unsigned int sum		: 1;
-		unsigned int domid		: 14;
-	} u;
+struct mon_data {
+	struct list_head	list;
+	enum resctrl_res_level	rid;
+	enum resctrl_event_id	evtid;
+	int			domid;
+	bool			sum;
 };
 
 /**
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index cf51a8e47864..5a8199ac5c43 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -45,6 +45,12 @@ LIST_HEAD(rdt_all_groups);
 /* list of entries for the schemata file */
 LIST_HEAD(resctrl_schema_all);
 
+/*
+ * List of struct mon_data containing private data of event files for use by
+ * rdtgroup_mondata_show(). Protected by rdtgroup_mutex.
+ */
+static LIST_HEAD(mon_data_kn_priv_list);
+
 /* The filesystem can only be mounted once. */
 bool resctrl_mounted;
 
@@ -3082,6 +3088,63 @@ static void rmdir_all_sub(void)
 	kernfs_remove(kn_mondata);
 }
 
+/**
+ * mon_get_kn_priv() - Get the mon_data priv data for this event.
+ *
+ * The same values are used across the mon_data directories of all control and
+ * monitor groups for the same event in the same domain. Keep a list of
+ * allocated structures and re-use an existing one with the same values for
+ * @rid, @domid, etc.
+ *
+ * @rid:    The resource id for the event file being created.
+ * @domid:  The domain id for the event file being created.
+ * @mevt:   The type of event file being created.
+ * @do_sum: Whether SNC summing monitors are being created.
+ */
+static struct mon_data *mon_get_kn_priv(enum resctrl_res_level rid, int domid,
+					struct mon_evt *mevt,
+					bool do_sum)
+{
+	struct mon_data *priv;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	list_for_each_entry(priv, &mon_data_kn_priv_list, list) {
+		if (priv->rid == rid && priv->domid == domid &&
+		    priv->sum == do_sum && priv->evtid == mevt->evtid)
+			return priv;
+	}
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return NULL;
+
+	priv->rid = rid;
+	priv->domid = domid;
+	priv->sum = do_sum;
+	priv->evtid = mevt->evtid;
+	list_add_tail(&priv->list, &mon_data_kn_priv_list);
+
+	return priv;
+}
+
+/**
+ * mon_put_kn_priv() - Free all allocated mon_data structures.
+ *
+ * Called when resctrl file system is unmounted.
+ */
+static void mon_put_kn_priv(void)
+{
+	struct mon_data *priv, *tmp;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	list_for_each_entry_safe(priv, tmp, &mon_data_kn_priv_list, list) {
+		list_del(&priv->list);
+		kfree(priv);
+	}
+}
+
 static void resctrl_fs_teardown(void)
 {
 	lockdep_assert_held(&rdtgroup_mutex);
@@ -3091,6 +3154,7 @@ static void resctrl_fs_teardown(void)
 		return;
 
 	rmdir_all_sub();
+	mon_put_kn_priv();
 	rdt_pseudo_lock_release();
 	rdtgroup_default.mode = RDT_MODE_SHAREABLE;
 	closid_exit();
@@ -3197,19 +3261,20 @@ static int mon_add_all_files(struct kernfs_node *kn, struct rdt_mon_domain *d,
 			     bool do_sum)
 {
 	struct rmid_read rr = {0};
-	union mon_data_bits priv;
+	struct mon_data *priv;
 	struct mon_evt *mevt;
-	int ret;
+	int ret, domid;
 
 	if (WARN_ON(list_empty(&r->evt_list)))
 		return -EPERM;
 
-	priv.u.rid = r->rid;
-	priv.u.domid = do_sum ? d->ci->id : d->hdr.id;
-	priv.u.sum = do_sum;
 	list_for_each_entry(mevt, &r->evt_list, list) {
-		priv.u.evtid = mevt->evtid;
-		ret = mon_addfile(kn, mevt->name, priv.priv);
+		domid = do_sum ? d->ci->id : d->hdr.id;
+		priv = mon_get_kn_priv(r->rid, domid, mevt, do_sum);
+		if (WARN_ON_ONCE(!priv))
+			return -EINVAL;
+
+		ret = mon_addfile(kn, mevt->name, priv);
 		if (ret)
 			return ret;
 
-- 
Gitee


From bdbbacf949bf74dbdeb06a400310fbb067c4778a Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:43 +0000
Subject: [PATCH 246/280] x86/resctrl: Split trace.h

ANBZ: #31045

commit 270f00bcc9525c8ba667349ba3e8c4dbcbbf70fb upstream.

trace.h contains all the tracepoints. After the move to /fs/resctrl, some
of these will be left behind. All the pseudo_lock tracepoints remain part
of the architecture. The lone tracepoint in monitor.c moves to /fs/resctrl.

Split trace.h so that each C file includes a different trace header file.
This means the trace header files are not modified when they are moved.

Intel-SIG: commit 270f00bcc952 x86/resctrl: Split trace.h
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-14-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/Makefile          |  3 ++
 arch/x86/kernel/cpu/resctrl/monitor.c         |  4 ++-
 arch/x86/kernel/cpu/resctrl/monitor_trace.h   | 31 +++++++++++++++++++
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c     |  2 +-
 .../resctrl/{trace.h => pseudo_lock_trace.h}  | 24 +++-----------
 5 files changed, 42 insertions(+), 22 deletions(-)
 create mode 100644 arch/x86/kernel/cpu/resctrl/monitor_trace.h
 rename arch/x86/kernel/cpu/resctrl/{trace.h => pseudo_lock_trace.h} (56%)

diff --git a/arch/x86/kernel/cpu/resctrl/Makefile b/arch/x86/kernel/cpu/resctrl/Makefile
index 0c13b0befd8a..909be78ec6da 100644
--- a/arch/x86/kernel/cpu/resctrl/Makefile
+++ b/arch/x86/kernel/cpu/resctrl/Makefile
@@ -2,4 +2,7 @@
 obj-$(CONFIG_X86_CPU_RESCTRL)		+= core.o rdtgroup.o monitor.o
 obj-$(CONFIG_X86_CPU_RESCTRL)		+= ctrlmondata.o
 obj-$(CONFIG_RESCTRL_FS_PSEUDO_LOCK)	+= pseudo_lock.o
+
+# To allow define_trace.h's recursive include:
 CFLAGS_pseudo_lock.o = -I$(src)
+CFLAGS_monitor.o = -I$(src)
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 4962ae4bc596..ac1cec61829c 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -26,7 +26,9 @@
 #include <asm/resctrl.h>
 
 #include "internal.h"
-#include "trace.h"
+
+#define CREATE_TRACE_POINTS
+#include "monitor_trace.h"
 
 /**
  * struct rmid_entry - dirty tracking for all RMID.
diff --git a/arch/x86/kernel/cpu/resctrl/monitor_trace.h b/arch/x86/kernel/cpu/resctrl/monitor_trace.h
new file mode 100644
index 000000000000..ade67daf42c2
--- /dev/null
+++ b/arch/x86/kernel/cpu/resctrl/monitor_trace.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM resctrl
+
+#if !defined(_FS_RESCTRL_MONITOR_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _FS_RESCTRL_MONITOR_TRACE_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(mon_llc_occupancy_limbo,
+	    TP_PROTO(u32 ctrl_hw_id, u32 mon_hw_id, int domain_id, u64 llc_occupancy_bytes),
+	    TP_ARGS(ctrl_hw_id, mon_hw_id, domain_id, llc_occupancy_bytes),
+	    TP_STRUCT__entry(__field(u32, ctrl_hw_id)
+			     __field(u32, mon_hw_id)
+			     __field(int, domain_id)
+			     __field(u64, llc_occupancy_bytes)),
+	    TP_fast_assign(__entry->ctrl_hw_id = ctrl_hw_id;
+			   __entry->mon_hw_id = mon_hw_id;
+			   __entry->domain_id = domain_id;
+			   __entry->llc_occupancy_bytes = llc_occupancy_bytes;),
+	    TP_printk("ctrl_hw_id=%u mon_hw_id=%u domain_id=%d llc_occupancy_bytes=%llu",
+		      __entry->ctrl_hw_id, __entry->mon_hw_id, __entry->domain_id,
+		      __entry->llc_occupancy_bytes)
+	   );
+
+#endif /* _FS_RESCTRL_MONITOR_TRACE_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#define TRACE_INCLUDE_FILE monitor_trace
+#include <trace/define_trace.h>
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index bee3038a634d..3d1ba08b2546 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -30,7 +30,7 @@
 #include "internal.h"
 
 #define CREATE_TRACE_POINTS
-#include "trace.h"
+#include "pseudo_lock_trace.h"
 
 /*
  * The bits needed to disable hardware prefetching varies based on the
diff --git a/arch/x86/kernel/cpu/resctrl/trace.h b/arch/x86/kernel/cpu/resctrl/pseudo_lock_trace.h
similarity index 56%
rename from arch/x86/kernel/cpu/resctrl/trace.h
rename to arch/x86/kernel/cpu/resctrl/pseudo_lock_trace.h
index 2a506316b303..5a0fae61d3ee 100644
--- a/arch/x86/kernel/cpu/resctrl/trace.h
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock_trace.h
@@ -2,8 +2,8 @@
 #undef TRACE_SYSTEM
 #define TRACE_SYSTEM resctrl
 
-#if !defined(_TRACE_RESCTRL_H) || defined(TRACE_HEADER_MULTI_READ)
-#define _TRACE_RESCTRL_H
+#if !defined(_X86_RESCTRL_PSEUDO_LOCK_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _X86_RESCTRL_PSEUDO_LOCK_TRACE_H
 
 #include <linux/tracepoint.h>
 
@@ -35,25 +35,9 @@ TRACE_EVENT(pseudo_lock_l3,
 	    TP_printk("hits=%llu miss=%llu",
 		      __entry->l3_hits, __entry->l3_miss));
 
-TRACE_EVENT(mon_llc_occupancy_limbo,
-	    TP_PROTO(u32 ctrl_hw_id, u32 mon_hw_id, int domain_id, u64 llc_occupancy_bytes),
-	    TP_ARGS(ctrl_hw_id, mon_hw_id, domain_id, llc_occupancy_bytes),
-	    TP_STRUCT__entry(__field(u32, ctrl_hw_id)
-			     __field(u32, mon_hw_id)
-			     __field(int, domain_id)
-			     __field(u64, llc_occupancy_bytes)),
-	    TP_fast_assign(__entry->ctrl_hw_id = ctrl_hw_id;
-			   __entry->mon_hw_id = mon_hw_id;
-			   __entry->domain_id = domain_id;
-			   __entry->llc_occupancy_bytes = llc_occupancy_bytes;),
-	    TP_printk("ctrl_hw_id=%u mon_hw_id=%u domain_id=%d llc_occupancy_bytes=%llu",
-		      __entry->ctrl_hw_id, __entry->mon_hw_id, __entry->domain_id,
-		      __entry->llc_occupancy_bytes)
-	   );
-
-#endif /* _TRACE_RESCTRL_H */
+#endif /* _X86_RESCTRL_PSEUDO_LOCK_TRACE_H */
 
 #undef TRACE_INCLUDE_PATH
 #define TRACE_INCLUDE_PATH .
-#define TRACE_INCLUDE_FILE trace
+#define TRACE_INCLUDE_FILE pseudo_lock_trace
 #include <trace/define_trace.h>
-- 
Gitee


From a1c9f04d00d09010be46b51db7069fd30b1ea616 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:44 +0000
Subject: [PATCH 247/280] x86/resctrl: Add 'resctrl' to the title of the
 resctrl documentation

ANBZ: #31045

commit 003e86077143ebeaa5299fb2bc907ae3b6650028 upstream.

The resctrl documentation is titled "User Interface for Resource Control
feature".

Once the documentation follows the code in a move to the filesystem, this
appears in the list of filesystems, but doesn't contain the name of the
filesystem, making it hard to find.

Add 'resctrl' to the title.

Intel-SIG: commit 003e86077143 x86/resctrl: Add 'resctrl' to the title of the resctrl documentation
Backport Resctrl/RDT-SNC for Intel platforms

Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-15-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/resctrl.rst | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 3676e22dfe2b..361b524f6f31 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -1,9 +1,9 @@
 .. SPDX-License-Identifier: GPL-2.0
 .. include:: <isonum.txt>
 
-===========================================
-User Interface for Resource Control feature
-===========================================
+=====================================================
+User Interface for Resource Control feature (resctrl)
+=====================================================
 
 :Copyright: |copy| 2016 Intel Corporation
 :Authors: - Fenghua Yu <fenghua.yu@intel.com>
-- 
Gitee


From 613603aeb31b51f02e8d14a933e5eb69d99def02 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:45 +0000
Subject: [PATCH 248/280] fs/resctrl: Add boiler plate for external resctrl
 code

ANBZ: #31045

commit bff70402d6d67843fe319338e4c56e1cba13fbd8 upstream.

Add Makefile and Kconfig for fs/resctrl. Add ARCH_HAS_CPU_RESCTRL
for the common parts of the resctrl interface and make X86_CPU_RESCTRL
select this.

Adding an include of asm/resctrl.h to linux/resctrl.h allows the
/fs/resctrl files to switch over to using this header instead.

Intel-SIG: commit bff70402d6d6 fs/resctrl: Add boiler plate for external resctrl code
Backport Resctrl/RDT-SNC for Intel platforms

Co-developed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-16-james.morse@arm.com

 Conflicts:
	arch/x86/Kconfig
	arch/x86/kernel/cpu/resctrl/pseudo_lock.c
	fs/Makefile
[jz: resolve context conflict]
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 MAINTAINERS                               |  1 +
 arch/Kconfig                              |  8 +++++
 arch/x86/Kconfig                          | 11 ++-----
 arch/x86/kernel/cpu/resctrl/internal.h    |  2 --
 arch/x86/kernel/cpu/resctrl/monitor.c     |  2 +-
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c |  2 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    |  2 +-
 fs/Kconfig                                |  1 +
 fs/Makefile                               |  1 +
 fs/resctrl/Kconfig                        | 39 +++++++++++++++++++++++
 fs/resctrl/Makefile                       |  6 ++++
 fs/resctrl/ctrlmondata.c                  |  0
 fs/resctrl/internal.h                     |  0
 fs/resctrl/monitor.c                      |  0
 fs/resctrl/monitor_trace.h                |  0
 fs/resctrl/pseudo_lock.c                  |  0
 fs/resctrl/pseudo_lock_trace.h            |  0
 fs/resctrl/rdtgroup.c                     |  0
 include/linux/resctrl.h                   |  4 +++
 19 files changed, 66 insertions(+), 13 deletions(-)
 create mode 100644 fs/resctrl/Kconfig
 create mode 100644 fs/resctrl/Makefile
 create mode 100644 fs/resctrl/ctrlmondata.c
 create mode 100644 fs/resctrl/internal.h
 create mode 100644 fs/resctrl/monitor.c
 create mode 100644 fs/resctrl/monitor_trace.h
 create mode 100644 fs/resctrl/pseudo_lock.c
 create mode 100644 fs/resctrl/pseudo_lock_trace.h
 create mode 100644 fs/resctrl/rdtgroup.c

diff --git a/MAINTAINERS b/MAINTAINERS
index cde0fe482aae..2def3d5f43b3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18204,6 +18204,7 @@ S:	Supported
 F:	Documentation/arch/x86/resctrl*
 F:	arch/x86/include/asm/resctrl.h
 F:	arch/x86/kernel/cpu/resctrl/
+F:	fs/resctrl/
 F:	include/linux/resctrl*.h
 F:	tools/testing/selftests/resctrl/
 
diff --git a/arch/Kconfig b/arch/Kconfig
index ad97c9f158e0..7d35b843620c 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1341,6 +1341,14 @@ config STRICT_MODULE_RWX
 config ARCH_HAS_PHYS_TO_DMA
 	bool
 
+config ARCH_HAS_CPU_RESCTRL
+	bool
+	help
+	  An architecture selects this option to indicate that the necessary
+	  hooks are provided to support the common memory system usage
+	  monitoring and control interfaces provided by the 'resctrl'
+	  filesystem (see RESCTRL_FS).
+
 config HAVE_ARCH_COMPILER_H
 	bool
 	help
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ac2e95c097c3..82dafbe6af59 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -492,8 +492,9 @@ config GOLDFISH
 config X86_CPU_RESCTRL
 	bool "x86 CPU resource control support"
 	depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD)
-	select KERNFS
-	select PROC_CPU_RESCTRL		if PROC_FS
+	depends on MISC_FILESYSTEMS
+	select ARCH_HAS_CPU_RESCTRL
+	select RESCTRL_FS
 	select RESCTRL_FS_PSEUDO_LOCK
 	help
 	  Enable x86 CPU resource control support.
@@ -511,12 +512,6 @@ config X86_CPU_RESCTRL
 
 	  Say N if unsure.
 
-config RESCTRL_FS_PSEUDO_LOCK
-	bool
-	help
-	  Software mechanism to pin data in a cache portion using
-	  micro-architecture specific knowledge.
-
 if X86_32
 config X86_BIGSMP
 	bool "Support for big SMP systems with more than 8 CPUs"
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 185e4637a804..aa2df42ef4ec 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -9,8 +9,6 @@
 #include <linux/jump_label.h>
 #include <linux/tick.h>
 
-#include <asm/resctrl.h>
-
 #define L3_QOS_CDP_ENABLE		0x01ULL
 
 #define L2_QOS_CDP_ENABLE		0x01ULL
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index ac1cec61829c..8847c23e9ac1 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -19,11 +19,11 @@
 
 #include <linux/cpu.h>
 #include <linux/module.h>
+#include <linux/resctrl.h>
 #include <linux/sizes.h>
 #include <linux/slab.h>
 
 #include <asm/cpu_device_id.h>
-#include <asm/resctrl.h>
 
 #include "internal.h"
 
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 3d1ba08b2546..b8fd4f480a4b 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -18,12 +18,12 @@
 #include <linux/mman.h>
 #include <linux/perf_event.h>
 #include <linux/pm_qos.h>
+#include <linux/resctrl.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 
 #include <asm/cacheflush.h>
 #include <asm/cpu_device_id.h>
-#include <asm/resctrl.h>
 #include <asm/perf_event.h>
 
 #include "../../events/perf_event.h" /* For X86_CONFIG() */
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 5a8199ac5c43..549de32279dc 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -18,6 +18,7 @@
 #include <linux/fs_parser.h>
 #include <linux/sysfs.h>
 #include <linux/kernfs.h>
+#include <linux/resctrl.h>
 #include <linux/seq_buf.h>
 #include <linux/seq_file.h>
 #include <linux/sched/signal.h>
@@ -28,7 +29,6 @@
 
 #include <uapi/linux/magic.h>
 
-#include <asm/resctrl.h>
 #include "internal.h"
 
 DEFINE_STATIC_KEY_FALSE(rdt_enable_key);
diff --git a/fs/Kconfig b/fs/Kconfig
index c7090d46e7d6..32d4f37da0d6 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -332,6 +332,7 @@ source "fs/omfs/Kconfig"
 source "fs/hpfs/Kconfig"
 source "fs/qnx4/Kconfig"
 source "fs/qnx6/Kconfig"
+source "fs/resctrl/Kconfig"
 source "fs/romfs/Kconfig"
 source "fs/pstore/Kconfig"
 source "fs/sysv/Kconfig"
diff --git a/fs/Makefile b/fs/Makefile
index f9541f40be4e..b62375770dee 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -129,3 +129,4 @@ obj-$(CONFIG_EFIVAR_FS)		+= efivarfs/
 obj-$(CONFIG_EROFS_FS)		+= erofs/
 obj-$(CONFIG_VBOXSF_FS)		+= vboxsf/
 obj-$(CONFIG_ZONEFS_FS)		+= zonefs/
+obj-$(CONFIG_RESCTRL_FS)	+= resctrl/
diff --git a/fs/resctrl/Kconfig b/fs/resctrl/Kconfig
new file mode 100644
index 000000000000..478a8e2ad99f
--- /dev/null
+++ b/fs/resctrl/Kconfig
@@ -0,0 +1,39 @@
+config RESCTRL_FS
+	bool "CPU Resource Control Filesystem (resctrl)"
+	depends on ARCH_HAS_CPU_RESCTRL
+	select KERNFS
+	select PROC_CPU_RESCTRL if PROC_FS
+	help
+	  Some architectures provide hardware facilities to group tasks and
+	  monitor and control their usage of memory system resources such as
+	  caches and memory bandwidth.  Examples of such facilities include
+	  Intel's Resource Director Technology (Intel(R) RDT) and AMD's
+	  Platform Quality of Service (AMD QoS).
+
+	  If your system has the necessary support and you want to be able to
+	  assign tasks to groups and manipulate the associated resource
+	  monitors and controls from userspace, say Y here to get a mountable
+	  'resctrl' filesystem that lets you do just that.
+
+	  If nothing mounts or prods the 'resctrl' filesystem, resource
+	  controls and monitors are left in a quiescent, permissive state.
+
+	  On architectures where this can be disabled independently, it is
+	  safe to say N.
+
+	  See <file:Documentation/arch/x86/resctrl.rst> for more information.
+
+config RESCTRL_FS_PSEUDO_LOCK
+	bool
+	depends on RESCTRL_FS
+	help
+	  Software mechanism to pin data in a cache portion using
+	  micro-architecture specific knowledge.
+
+config RESCTRL_RMID_DEPENDS_ON_CLOSID
+	bool
+	depends on RESCTRL_FS
+	help
+	  Enabled by the architecture when the RMID values depend on the CLOSID.
+	  This causes the CLOSID allocator to search for CLOSID with clean
+	  RMID.
diff --git a/fs/resctrl/Makefile b/fs/resctrl/Makefile
new file mode 100644
index 000000000000..e67f34d2236a
--- /dev/null
+++ b/fs/resctrl/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_RESCTRL_FS)		+= rdtgroup.o ctrlmondata.o monitor.o
+obj-$(CONFIG_RESCTRL_FS_PSEUDO_LOCK)	+= pseudo_lock.o
+
+# To allow define_trace.h's recursive include:
+CFLAGS_monitor.o = -I$(src)
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/fs/resctrl/monitor_trace.h b/fs/resctrl/monitor_trace.h
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/fs/resctrl/pseudo_lock.c b/fs/resctrl/pseudo_lock.c
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/fs/resctrl/pseudo_lock_trace.h b/fs/resctrl/pseudo_lock_trace.h
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index b8f8240050b4..5c7c8bf2c47f 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -8,6 +8,10 @@
 #include <linux/pid.h>
 #include <linux/resctrl_types.h>
 
+#ifdef CONFIG_ARCH_HAS_CPU_RESCTRL
+#include <asm/resctrl.h>
+#endif
+
 /* CLOSID, RMID value used by the default control group */
 #define RESCTRL_RESERVED_CLOSID		0
 #define RESCTRL_RESERVED_RMID		0
-- 
Gitee


From 2fbcda834f73324737ead620514792f7584376a7 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:46 +0000
Subject: [PATCH 249/280] x86/resctrl: Move the filesystem bits to headers
 visible to fs/resctrl

ANBZ: #31045

commit 3d95a49b365e06d1b4c4e5a426fdc70449a334f3 upstream.

Once the filesystem parts of resctrl move to fs/resctrl, it cannot rely
on definitions in x86's internal.h.

Move definitions in internal.h that need to be shared between the
filesystem and architecture code to header files that fs/resctrl can
include.

Doing this separately means the filesystem code only moves between files
of the same name, instead of having these changes mixed in too.

Intel-SIG: commit 3d95a49b365e x86/resctrl: Move the filesystem bits to headers visible to fs/resctrl
Backport Resctrl/RDT-SNC for Intel platforms

Co-developed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com> # arm64
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-17-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h | 9 ---------
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 5 +++++
 include/linux/resctrl.h                | 3 +++
 include/linux/resctrl_types.h          | 3 +++
 4 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index aa2df42ef4ec..4286d72e6010 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -16,8 +16,6 @@
 #define CQM_LIMBOCHECK_INTERVAL	1000
 
 #define MBM_CNTR_WIDTH_BASE		24
-#define MBM_OVERFLOW_INTERVAL		1000
-#define MAX_MBA_BW			100u
 #define MBA_IS_LINEAR			0x4
 #define MBM_CNTR_WIDTH_OFFSET_AMD	20
 
@@ -391,13 +389,6 @@ extern struct rdtgroup rdtgroup_default;
 extern struct dentry *debugfs_resctrl;
 extern enum resctrl_event_id mba_mbps_default_event;
 
-static inline bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l)
-{
-	return rdt_resources_all[l].cdp_enabled;
-}
-
-int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
-
 void arch_mon_domain_online(struct rdt_resource *r, struct rdt_mon_domain *d);
 
 /* CPUID.(EAX=10H, ECX=ResID=1).EAX */
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 549de32279dc..3446f9799569 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2531,6 +2531,11 @@ int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable)
 	return 0;
 }
 
+bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l)
+{
+	return rdt_resources_all[l].cdp_enabled;
+}
+
 /*
  * We don't allow rdtgroup directories to be created anywhere
  * except the root directory. Thus when looking for the rdtgroup
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 5c7c8bf2c47f..b9d1f2916e9c 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -403,6 +403,9 @@ static inline u32 resctrl_get_config_index(u32 closid,
 	}
 }
 
+bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l);
+int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable);
+
 /*
  * Update the ctrl_val and apply this config right now.
  * Must be called on one of the domain's CPUs.
diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h
index 69bf740130ac..a66e7936943e 100644
--- a/include/linux/resctrl_types.h
+++ b/include/linux/resctrl_types.h
@@ -7,6 +7,9 @@
 #ifndef __LINUX_RESCTRL_TYPES_H
 #define __LINUX_RESCTRL_TYPES_H
 
+#define MAX_MBA_BW			100u
+#define MBM_OVERFLOW_INTERVAL		1000
+
 /* Reads to Local DRAM Memory */
 #define READS_TO_LOCAL_MEM		BIT(0)
 
-- 
Gitee


From 41743fb23ad59a4f0c1db6122af5763c02c27118 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:47 +0000
Subject: [PATCH 250/280] x86/resctrl: Move enum resctrl_event_id to resctrl.h

ANBZ: #31045

commit 7bdb619c7f9f0a7264b2d69ad0472bf2c785e52a upstream.

resctrl_types.h contains common types and constants to enable architectures
to use these types in their definitions within asm/resctrl.h.

enum resctrl_event_id was placed in resctrl_types.h for
resctrl_arch_get_cdp_enabled() and resctrl_arch_set_cdp_enabled(), but
these two functions are no longer inlined by any architecture.

Move enum resctrl_event_id to resctrl.h.

Intel-SIG: commit 7bdb619c7f9f x86/resctrl: Move enum resctrl_event_id to resctrl.h
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-18-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/resctrl.h       | 10 ++++++++++
 include/linux/resctrl_types.h | 10 ----------
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index b9d1f2916e9c..5ef972cbf56b 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -48,6 +48,16 @@ int proc_resctrl_show(struct seq_file *m,
 	for_each_rdt_resource((r))					      \
 		if ((r)->mon_capable)
 
+enum resctrl_res_level {
+	RDT_RESOURCE_L3,
+	RDT_RESOURCE_L2,
+	RDT_RESOURCE_MBA,
+	RDT_RESOURCE_SMBA,
+
+	/* Must be the last */
+	RDT_NUM_RESOURCES,
+};
+
 /**
  * enum resctrl_conf_type - The type of configuration.
  * @CDP_NONE:	No prioritisation, both code and data are controlled or monitored.
diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h
index a66e7936943e..a25fb9c4070d 100644
--- a/include/linux/resctrl_types.h
+++ b/include/linux/resctrl_types.h
@@ -34,16 +34,6 @@
 /* Max event bits supported */
 #define MAX_EVT_CONFIG_BITS		GENMASK(6, 0)
 
-enum resctrl_res_level {
-	RDT_RESOURCE_L3,
-	RDT_RESOURCE_L2,
-	RDT_RESOURCE_MBA,
-	RDT_RESOURCE_SMBA,
-
-	/* Must be the last */
-	RDT_NUM_RESOURCES,
-};
-
 /*
  * Event IDs, the values match those used to program IA32_QM_EVTSEL before
  * reading IA32_QM_CTR on RDT systems.
-- 
Gitee


From 3b3dcd93a388a16eae2a5d2dd4b4b9689db2a1ef Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:48 +0000
Subject: [PATCH 251/280] x86/resctrl: Fix types in
 resctrl_arch_mon_ctx_{alloc,free}() stubs

ANBZ: #31045

commit 272ed1c28c9db60b9bd50d49feae463df50b3ef6 upstream.

resctrl_arch_mon_ctx_alloc() and resctrl_arch_mon_ctx_free() take an enum
resctrl_event_id that is already defined in resctrl_types.h to be
accessible to asm/resctrl.h.

The x86 stubs take an int. Fix that.

Intel-SIG: commit 272ed1c28c9d x86/resctrl: Fix types in resctrl_arch_mon_ctx_{alloc,free}() stubs
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-19-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 7a39728b0743..a2e20fe90a2c 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -194,14 +194,16 @@ static inline u32 resctrl_arch_rmid_idx_encode(u32 ignored, u32 rmid)
 
 /* x86 can always read an rmid, nothing needs allocating */
 struct rdt_resource;
-static inline void *resctrl_arch_mon_ctx_alloc(struct rdt_resource *r, int evtid)
+static inline void *resctrl_arch_mon_ctx_alloc(struct rdt_resource *r,
+					       enum resctrl_event_id evtid)
 {
 	might_sleep();
 	return NULL;
-};
+}
 
-static inline void resctrl_arch_mon_ctx_free(struct rdt_resource *r, int evtid,
-					     void *ctx) { };
+static inline void resctrl_arch_mon_ctx_free(struct rdt_resource *r,
+					     enum resctrl_event_id evtid,
+					     void *ctx) { }
 
 u64 resctrl_arch_get_prefetch_disable_bits(void);
 int resctrl_arch_pseudo_lock_fn(void *_plr);
-- 
Gitee


From fd767783b9c6739234dd2753d5ca84da6759be7f Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:49 +0000
Subject: [PATCH 252/280] x86/resctrl: Move pseudo lock prototypes to
 include/linux/resctrl.h

ANBZ: #31045

commit 279f225951e3c77a1708d77f557b4cc7bdbd76ed upstream.

The resctrl pseudo-lock feature allows an architecture to allocate data
into particular cache portions, which are then treated as reserved to
avoid that data ever being evicted. Setting this up is deeply architecture
specific as it involves disabling prefetchers etc. It is not possible
to support this kind of feature on arm64. Risc-V is assumed to be the
same.

The prototypes for the architecture code were added to x86's asm/resctrl.h,
with other architectures able to provide stubs for their architecture. This
forces other architectures to provide identical stubs.

Move the prototypes and stubs to linux/resctrl.h, and switch between them
using the existing Kconfig symbol.

Intel-SIG: commit 279f225951e3 x86/resctrl: Move pseudo lock prototypes to include/linux/resctrl.h
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-20-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/include/asm/resctrl.h |  5 -----
 include/linux/resctrl.h        | 13 +++++++++++++
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index a2e20fe90a2c..ad497ab196d1 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -205,11 +205,6 @@ static inline void resctrl_arch_mon_ctx_free(struct rdt_resource *r,
 					     enum resctrl_event_id evtid,
 					     void *ctx) { }
 
-u64 resctrl_arch_get_prefetch_disable_bits(void);
-int resctrl_arch_pseudo_lock_fn(void *_plr);
-int resctrl_arch_measure_cycles_lat_fn(void *_plr);
-int resctrl_arch_measure_l2_residency(void *_plr);
-int resctrl_arch_measure_l3_residency(void *_plr);
 void resctrl_cpu_detect(struct cpuinfo_x86 *c);
 
 #else
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 5ef972cbf56b..9ba771f2ddea 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -534,4 +534,17 @@ extern unsigned int resctrl_rmid_realloc_limit;
 int resctrl_init(void);
 void resctrl_exit(void);
 
+#ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
+u64 resctrl_arch_get_prefetch_disable_bits(void);
+int resctrl_arch_pseudo_lock_fn(void *_plr);
+int resctrl_arch_measure_cycles_lat_fn(void *_plr);
+int resctrl_arch_measure_l2_residency(void *_plr);
+int resctrl_arch_measure_l3_residency(void *_plr);
+#else
+static inline u64 resctrl_arch_get_prefetch_disable_bits(void) { return 0; }
+static inline int resctrl_arch_pseudo_lock_fn(void *_plr) { return 0; }
+static inline int resctrl_arch_measure_cycles_lat_fn(void *_plr) { return 0; }
+static inline int resctrl_arch_measure_l2_residency(void *_plr) { return 0; }
+static inline int resctrl_arch_measure_l3_residency(void *_plr) { return 0; }
+#endif /* CONFIG_RESCTRL_FS_PSEUDO_LOCK */
 #endif /* _RESCTRL_H */
-- 
Gitee


From 7bc5e9c73ebebf21e10c5938f818b52a772f9f72 Mon Sep 17 00:00:00 2001
From: Dave Martin <Dave.Martin@arm.com>
Date: Thu, 15 May 2025 16:58:50 +0000
Subject: [PATCH 253/280] x86/resctrl: Squelch whitespace anomalies in resctrl
 core code

ANBZ: #31045

commit 556f48a5093b1edb1b8a594af633303269dec329 upstream.

checkpatch.pl complains about some whitespace anomalies in the
resctrl core code.

This doesn't matter, but since this code is about to be factored
out and made generic, this is a good opportunity to fix these
issues and so reduce future checkpatch fuzz.

Fix them.

No functional change.

Intel-SIG: commit 556f48a5093b x86/resctrl: Squelch whitespace anomalies in resctrl core code
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-21-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 3446f9799569..5de8e025b56d 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1014,7 +1014,7 @@ static int rdt_num_closids_show(struct kernfs_open_file *of,
 }
 
 static int rdt_default_ctrl_show(struct kernfs_open_file *of,
-			     struct seq_file *seq, void *v)
+				 struct seq_file *seq, void *v)
 {
 	struct resctrl_schema *s = of->kn->parent->priv;
 	struct rdt_resource *r = s->res;
@@ -1024,7 +1024,7 @@ static int rdt_default_ctrl_show(struct kernfs_open_file *of,
 }
 
 static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
-			     struct seq_file *seq, void *v)
+				 struct seq_file *seq, void *v)
 {
 	struct resctrl_schema *s = of->kn->parent->priv;
 	struct rdt_resource *r = s->res;
@@ -1140,7 +1140,7 @@ static int rdt_bit_usage_show(struct kernfs_open_file *of,
 }
 
 static int rdt_min_bw_show(struct kernfs_open_file *of,
-			     struct seq_file *seq, void *v)
+			   struct seq_file *seq, void *v)
 {
 	struct resctrl_schema *s = of->kn->parent->priv;
 	struct rdt_resource *r = s->res;
@@ -1175,7 +1175,7 @@ static int rdt_mon_features_show(struct kernfs_open_file *of,
 }
 
 static int rdt_bw_gran_show(struct kernfs_open_file *of,
-			     struct seq_file *seq, void *v)
+			    struct seq_file *seq, void *v)
 {
 	struct resctrl_schema *s = of->kn->parent->priv;
 	struct rdt_resource *r = s->res;
@@ -1185,7 +1185,7 @@ static int rdt_bw_gran_show(struct kernfs_open_file *of,
 }
 
 static int rdt_delay_linear_show(struct kernfs_open_file *of,
-			     struct seq_file *seq, void *v)
+				 struct seq_file *seq, void *v)
 {
 	struct resctrl_schema *s = of->kn->parent->priv;
 	struct rdt_resource *r = s->res;
@@ -2058,7 +2058,6 @@ static struct rftype res_common_files[] = {
 		.seq_show	= rdtgroup_closid_show,
 		.fflags		= RFTYPE_CTRL_BASE | RFTYPE_DEBUG,
 	},
-
 };
 
 static int rdtgroup_add_files(struct kernfs_node *kn, unsigned long fflags)
@@ -3617,7 +3616,6 @@ static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
 			rdt_last_cmd_puts("Failed to initialize allocations\n");
 			goto out;
 		}
-
 	}
 
 	rdtgrp->mode = RDT_MODE_SHAREABLE;
-- 
Gitee


From a9b3d1476dde029a1231ce6fd34d406008f72882 Mon Sep 17 00:00:00 2001
From: Dave Martin <Dave.Martin@arm.com>
Date: Thu, 15 May 2025 16:58:51 +0000
Subject: [PATCH 254/280] x86/resctrl: Prefer alloc(sizeof(*foo)) idiom in
 rdt_init_fs_context()

ANBZ: #31045

commit df3dc0efcc01d6aae8ebd3e479fe0d55f894854b upstream.

rdt_init_fs_context() sizes a typed allocation using an explicit
sizeof(type) expression, which checkpatch.pl complains about.

Since this code is about to be factored out and made generic, this
is a good opportunity to fix the code to size the allocation based
on the target pointer instead, to reduce the chance of future mis-
maintenance.

Fix it.

No functional change.

Intel-SIG: commit df3dc0efcc01 x86/resctrl: Prefer alloc(sizeof(*foo)) idiom in rdt_init_fs_context()
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-22-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 5de8e025b56d..3da32b956a57 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2940,7 +2940,7 @@ static int rdt_init_fs_context(struct fs_context *fc)
 {
 	struct rdt_fs_context *ctx;
 
-	ctx = kzalloc(sizeof(struct rdt_fs_context), GFP_KERNEL);
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 	if (!ctx)
 		return -ENOMEM;
 
-- 
Gitee


From 351f5d44d655a8893415384dec9eb5ed27c828dc Mon Sep 17 00:00:00 2001
From: Dave Martin <Dave.Martin@arm.com>
Date: Thu, 15 May 2025 16:58:52 +0000
Subject: [PATCH 255/280] x86/resctrl: Relax some asm #includes

ANBZ: #31045

commit b7b57edbf5681c7d0ed504a3a4e912bb68661ab9 upstream.

checkpatch.pl identifies some direct #includes of asm headers that
can be satisfied by including the corresponding <linux/...> header
instead.

Fix them.

No intentional functional change.

Intel-SIG: commit b7b57edbf568 x86/resctrl: Relax some asm #includes
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Amit Singh Tomar <amitsinght@marvell.com> # arm64
Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> # arm64
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-23-james.morse@arm.com

 Conflicts:
	arch/x86/kernel/cpu/resctrl/pseudo_lock.c
[jz: resolve context conflict]
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index b8fd4f480a4b..610c1df67ede 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -11,6 +11,8 @@
 
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
 
+#include <linux/cacheflush.h>
+#include <linux/cacheinfo.h>
 #include <linux/cpu.h>
 #include <linux/cpumask.h>
 #include <linux/debugfs.h>
@@ -22,7 +24,6 @@
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 
-#include <asm/cacheflush.h>
 #include <asm/cpu_device_id.h>
 #include <asm/perf_event.h>
 
-- 
Gitee


From 1d2de3288641ed86430c6c74222fc398196646a1 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:53 +0000
Subject: [PATCH 256/280] x86/resctrl: Always initialise rid field in
 rdt_resources_all[]

ANBZ: #31045

commit f6b25be204b8661e4c32fa770a4c9e3a113ee325 upstream.

x86 has an array, rdt_resources_all[], of all possible resources.
The for-each-resource walkers depend on the rid field of all
resources being initialised.

If the array ever grows due to another architecture adding a resource
type that is not defined on x86, the for-each-resources walkers will
loop forever.

Initialise all the rid values in resctrl_arch_late_init() before
any for-each-resource walker can be called.

Intel-SIG: commit f6b25be204b8 x86/resctrl: Always initialise rid field in rdt_resources_all[]
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-24-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 58d7c6accdf2..224bed28f341 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -60,7 +60,6 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 	[RDT_RESOURCE_L3] =
 	{
 		.r_resctrl = {
-			.rid			= RDT_RESOURCE_L3,
 			.name			= "L3",
 			.ctrl_scope		= RESCTRL_L3_CACHE,
 			.mon_scope		= RESCTRL_L3_CACHE,
@@ -74,7 +73,6 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 	[RDT_RESOURCE_L2] =
 	{
 		.r_resctrl = {
-			.rid			= RDT_RESOURCE_L2,
 			.name			= "L2",
 			.ctrl_scope		= RESCTRL_L2_CACHE,
 			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_L2),
@@ -86,7 +84,6 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 	[RDT_RESOURCE_MBA] =
 	{
 		.r_resctrl = {
-			.rid			= RDT_RESOURCE_MBA,
 			.name			= "MB",
 			.ctrl_scope		= RESCTRL_L3_CACHE,
 			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_MBA),
@@ -96,7 +93,6 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
 	[RDT_RESOURCE_SMBA] =
 	{
 		.r_resctrl = {
-			.rid			= RDT_RESOURCE_SMBA,
 			.name			= "SMBA",
 			.ctrl_scope		= RESCTRL_L3_CACHE,
 			.ctrl_domains		= ctrl_domain_init(RDT_RESOURCE_SMBA),
@@ -996,7 +992,11 @@ void resctrl_cpu_detect(struct cpuinfo_x86 *c)
 static int __init resctrl_arch_late_init(void)
 {
 	struct rdt_resource *r;
-	int state, ret;
+	int state, ret, i;
+
+	/* for_each_rdt_resource() requires all rid to be initialised. */
+	for (i = 0; i < RDT_NUM_RESOURCES; i++)
+		rdt_resources_all[i].r_resctrl.rid = i;
 
 	/*
 	 * Initialize functions(or definitions) that are different
-- 
Gitee


From 828cd3a9b087656a391da0fe940e96951c5ac814 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
Date: Sun, 17 Sep 2023 13:24:21 +0200
Subject: [PATCH 257/280] ptrace: Convert ptrace_attach() to use lock guards

ANBZ: #31045

commit 5431fdd2c181dd2eac218e45b44deb2925fa48f0 upstream.

Created as testing for the conditional guard infrastructure.
Specifically this makes use of the following form:

  scoped_cond_guard (mutex_intr, return -ERESTARTNOINTR,
		     &task->signal->cred_guard_mutex) {
    ...
  }
  ...
  return 0;

Intel-SIG: commit 5431fdd2c181 ptrace: Convert ptrace_attach() to use lock guards
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lkml.kernel.org/r/20231102110706.568467727%40infradead.org
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 include/linux/sched/task.h |   2 +
 include/linux/spinlock.h   |  26 ++++++++
 kernel/ptrace.c            | 128 ++++++++++++++++++-------------------
 3 files changed, 89 insertions(+), 67 deletions(-)

diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index fbb7915526b4..a40cfd455fe5 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -233,4 +233,6 @@ static inline void task_unlock(struct task_struct *p)
 	spin_unlock(&p->alloc_lock);
 }
 
+DEFINE_GUARD(task_lock, struct task_struct *, task_lock(_T), task_unlock(_T))
+
 #endif /* _LINUX_SCHED_TASK_H */
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index ceb56b39c70f..90bc853cafb6 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -548,5 +548,31 @@ DEFINE_LOCK_GUARD_1(spinlock_irqsave, spinlock_t,
 DEFINE_LOCK_GUARD_1_COND(spinlock_irqsave, _try,
 			 spin_trylock_irqsave(_T->lock, _T->flags))
 
+DEFINE_LOCK_GUARD_1(read_lock, rwlock_t,
+		    read_lock(_T->lock),
+		    read_unlock(_T->lock))
+
+DEFINE_LOCK_GUARD_1(read_lock_irq, rwlock_t,
+		    read_lock_irq(_T->lock),
+		    read_unlock_irq(_T->lock))
+
+DEFINE_LOCK_GUARD_1(read_lock_irqsave, rwlock_t,
+		    read_lock_irqsave(_T->lock, _T->flags),
+		    read_unlock_irqrestore(_T->lock, _T->flags),
+		    unsigned long flags)
+
+DEFINE_LOCK_GUARD_1(write_lock, rwlock_t,
+		    write_lock(_T->lock),
+		    write_unlock(_T->lock))
+
+DEFINE_LOCK_GUARD_1(write_lock_irq, rwlock_t,
+		    write_lock_irq(_T->lock),
+		    write_unlock_irq(_T->lock))
+
+DEFINE_LOCK_GUARD_1(write_lock_irqsave, rwlock_t,
+		    write_lock_irqsave(_T->lock, _T->flags),
+		    write_unlock_irqrestore(_T->lock, _T->flags),
+		    unsigned long flags)
+
 #undef __LINUX_INSIDE_SPINLOCK_H
 #endif /* __LINUX_SPINLOCK_H */
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 443057bee87c..f63c6b5a18f0 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -386,6 +386,34 @@ static int check_ptrace_options(unsigned long data)
 	return 0;
 }
 
+static inline void ptrace_set_stopped(struct task_struct *task)
+{
+	guard(spinlock)(&task->sighand->siglock);
+
+	/*
+	 * If the task is already STOPPED, set JOBCTL_TRAP_STOP and
+	 * TRAPPING, and kick it so that it transits to TRACED.  TRAPPING
+	 * will be cleared if the child completes the transition or any
+	 * event which clears the group stop states happens.  We'll wait
+	 * for the transition to complete before returning from this
+	 * function.
+	 *
+	 * This hides STOPPED -> RUNNING -> TRACED transition from the
+	 * attaching thread but a different thread in the same group can
+	 * still observe the transient RUNNING state.  IOW, if another
+	 * thread's WNOHANG wait(2) on the stopped tracee races against
+	 * ATTACH, the wait(2) may fail due to the transient RUNNING.
+	 *
+	 * The following task_is_stopped() test is safe as both transitions
+	 * in and out of STOPPED are protected by siglock.
+	 */
+	if (task_is_stopped(task) &&
+	    task_set_jobctl_pending(task, JOBCTL_TRAP_STOP | JOBCTL_TRAPPING)) {
+		task->jobctl &= ~JOBCTL_STOPPED;
+		signal_wake_up_state(task, __TASK_STOPPED);
+	}
+}
+
 static int ptrace_attach(struct task_struct *task, long request,
 			 unsigned long addr,
 			 unsigned long flags)
@@ -393,17 +421,17 @@ static int ptrace_attach(struct task_struct *task, long request,
 	bool seize = (request == PTRACE_SEIZE);
 	int retval;
 
-	retval = -EIO;
 	if (seize) {
 		if (addr != 0)
-			goto out;
+			return -EIO;
 		/*
 		 * This duplicates the check in check_ptrace_options() because
 		 * ptrace_attach() and ptrace_setoptions() have historically
 		 * used different error codes for unknown ptrace options.
 		 */
 		if (flags & ~(unsigned long)PTRACE_O_MASK)
-			goto out;
+			return -EIO;
+
 		retval = check_ptrace_options(flags);
 		if (retval)
 			return retval;
@@ -414,88 +442,54 @@ static int ptrace_attach(struct task_struct *task, long request,
 
 	audit_ptrace(task);
 
-	retval = -EPERM;
 	if (unlikely(task->flags & PF_KTHREAD))
-		goto out;
+		return -EPERM;
 	if (same_thread_group(task, current))
-		goto out;
+		return -EPERM;
 
 	/*
 	 * Protect exec's credential calculations against our interference;
 	 * SUID, SGID and LSM creds get determined differently
 	 * under ptrace.
 	 */
-	retval = -ERESTARTNOINTR;
-	if (mutex_lock_interruptible(&task->signal->cred_guard_mutex))
-		goto out;
+	scoped_cond_guard (mutex_intr, return -ERESTARTNOINTR,
+			   &task->signal->cred_guard_mutex) {
 
-	task_lock(task);
-	retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH_REALCREDS);
-	task_unlock(task);
-	if (retval)
-		goto unlock_creds;
+		scoped_guard (task_lock, task) {
+			retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH_REALCREDS);
+			if (retval)
+				return retval;
+		}
 
-	write_lock_irq(&tasklist_lock);
-	retval = -EPERM;
-	if (unlikely(task->exit_state))
-		goto unlock_tasklist;
-	if (task->ptrace)
-		goto unlock_tasklist;
+		scoped_guard (write_lock_irq, &tasklist_lock) {
+			if (unlikely(task->exit_state))
+				return -EPERM;
+			if (task->ptrace)
+				return -EPERM;
 
-	task->ptrace = flags;
+			task->ptrace = flags;
 
-	ptrace_link(task, current);
+			ptrace_link(task, current);
 
-	/* SEIZE doesn't trap tracee on attach */
-	if (!seize)
-		send_sig_info(SIGSTOP, SEND_SIG_PRIV, task);
+			/* SEIZE doesn't trap tracee on attach */
+			if (!seize)
+				send_sig_info(SIGSTOP, SEND_SIG_PRIV, task);
 
-	spin_lock(&task->sighand->siglock);
+			ptrace_set_stopped(task);
+		}
+	}
 
 	/*
-	 * If the task is already STOPPED, set JOBCTL_TRAP_STOP and
-	 * TRAPPING, and kick it so that it transits to TRACED.  TRAPPING
-	 * will be cleared if the child completes the transition or any
-	 * event which clears the group stop states happens.  We'll wait
-	 * for the transition to complete before returning from this
-	 * function.
-	 *
-	 * This hides STOPPED -> RUNNING -> TRACED transition from the
-	 * attaching thread but a different thread in the same group can
-	 * still observe the transient RUNNING state.  IOW, if another
-	 * thread's WNOHANG wait(2) on the stopped tracee races against
-	 * ATTACH, the wait(2) may fail due to the transient RUNNING.
-	 *
-	 * The following task_is_stopped() test is safe as both transitions
-	 * in and out of STOPPED are protected by siglock.
+	 * We do not bother to change retval or clear JOBCTL_TRAPPING
+	 * if wait_on_bit() was interrupted by SIGKILL. The tracer will
+	 * not return to user-mode, it will exit and clear this bit in
+	 * __ptrace_unlink() if it wasn't already cleared by the tracee;
+	 * and until then nobody can ptrace this task.
 	 */
-	if (task_is_stopped(task) &&
-	    task_set_jobctl_pending(task, JOBCTL_TRAP_STOP | JOBCTL_TRAPPING)) {
-		task->jobctl &= ~JOBCTL_STOPPED;
-		signal_wake_up_state(task, __TASK_STOPPED);
-	}
-
-	spin_unlock(&task->sighand->siglock);
-
-	retval = 0;
-unlock_tasklist:
-	write_unlock_irq(&tasklist_lock);
-unlock_creds:
-	mutex_unlock(&task->signal->cred_guard_mutex);
-out:
-	if (!retval) {
-		/*
-		 * We do not bother to change retval or clear JOBCTL_TRAPPING
-		 * if wait_on_bit() was interrupted by SIGKILL. The tracer will
-		 * not return to user-mode, it will exit and clear this bit in
-		 * __ptrace_unlink() if it wasn't already cleared by the tracee;
-		 * and until then nobody can ptrace this task.
-		 */
-		wait_on_bit(&task->jobctl, JOBCTL_TRAPPING_BIT, TASK_KILLABLE);
-		proc_ptrace_connector(task, PTRACE_ATTACH);
-	}
+	wait_on_bit(&task->jobctl, JOBCTL_TRAPPING_BIT, TASK_KILLABLE);
+	proc_ptrace_connector(task, PTRACE_ATTACH);
 
-	return retval;
+	return 0;
 }
 
 /**
-- 
Gitee


From 550305ca513778e9128bf5fd0a4eee933c482b0e Mon Sep 17 00:00:00 2001
From: Valentine Sinitsyn <valesini@yandex-team.ru>
Date: Mon, 25 Sep 2023 11:40:12 +0300
Subject: [PATCH 258/280] kernfs: sysfs: support custom llseek method for sysfs
 entries

ANBZ: #31045

commit 0fedefd4c4e33dd24f726b13b5d7c143e2b483be upstream.

As of now, seeking in sysfs files is handled by generic_file_llseek().
There are situations where one may want to customize seeking logic:

- Many sysfs entries are fixed files while generic_file_llseek() accepts
  past-the-end positions. Not only being useless by itself, this
  also means a bug in userspace code will trigger not at lseek(), but at
  some later point making debugging harder.
- generic_file_llseek() relies on f_mapping->host to get the file size
  which might not be correct for all sysfs entries.
  See commit 636b21b50152 ("PCI: Revoke mappings like devmem") as an example.

Implement llseek method to override this behavior at sysfs attribute
level. The method is optional, and if it is absent,
generic_file_llseek() is called to preserve backwards compatibility.

Intel-SIG: commit 0fedefd4c4e3 kernfs: sysfs: support custom llseek method for sysfs entries
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Valentine Sinitsyn <valesini@yandex-team.ru>
Link: https://lore.kernel.org/r/20230925084013.309399-1-valesini@yandex-team.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/kernfs/file.c       | 29 ++++++++++++++++++++++++++++-
 fs/sysfs/file.c        | 13 +++++++++++++
 include/linux/kernfs.h |  1 +
 include/linux/sysfs.h  |  2 ++
 4 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index aa4b9da67437..bc3516c887e5 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -857,6 +857,33 @@ static __poll_t kernfs_fop_poll(struct file *filp, poll_table *wait)
 	return ret;
 }
 
+static loff_t kernfs_fop_llseek(struct file *file, loff_t offset, int whence)
+{
+	struct kernfs_open_file *of = kernfs_of(file);
+	const struct kernfs_ops *ops;
+	loff_t ret;
+
+	/*
+	 * @of->mutex nests outside active ref and is primarily to ensure that
+	 * the ops aren't called concurrently for the same open file.
+	 */
+	mutex_lock(&of->mutex);
+	if (!kernfs_get_active(of->kn)) {
+		mutex_unlock(&of->mutex);
+		return -ENODEV;
+	}
+
+	ops = kernfs_ops(of->kn);
+	if (ops->llseek)
+		ret = ops->llseek(of, offset, whence);
+	else
+		ret = generic_file_llseek(file, offset, whence);
+
+	kernfs_put_active(of->kn);
+	mutex_unlock(&of->mutex);
+	return ret;
+}
+
 static void kernfs_notify_workfn(struct work_struct *work)
 {
 	struct kernfs_node *kn;
@@ -959,7 +986,7 @@ EXPORT_SYMBOL_GPL(kernfs_notify);
 const struct file_operations kernfs_file_fops = {
 	.read_iter	= kernfs_fop_read_iter,
 	.write_iter	= kernfs_fop_write_iter,
-	.llseek		= generic_file_llseek,
+	.llseek		= kernfs_fop_llseek,
 	.mmap		= kernfs_fop_mmap,
 	.open		= kernfs_fop_open,
 	.release	= kernfs_fop_release,
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index f536840ee5b7..a7830f5dfb76 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -173,6 +173,18 @@ static int sysfs_kf_bin_mmap(struct kernfs_open_file *of,
 	return battr->mmap(of->file, kobj, battr, vma);
 }
 
+static loff_t sysfs_kf_bin_llseek(struct kernfs_open_file *of, loff_t offset,
+				  int whence)
+{
+	struct bin_attribute *battr = of->kn->priv;
+	struct kobject *kobj = of->kn->parent->priv;
+
+	if (battr->llseek)
+		return battr->llseek(of->file, kobj, battr, offset, whence);
+	else
+		return generic_file_llseek(of->file, offset, whence);
+}
+
 static int sysfs_kf_bin_open(struct kernfs_open_file *of)
 {
 	struct bin_attribute *battr = of->kn->priv;
@@ -255,6 +267,7 @@ static const struct kernfs_ops sysfs_bin_kfops_mmap = {
 	.write		= sysfs_kf_bin_write,
 	.mmap		= sysfs_kf_bin_mmap,
 	.open		= sysfs_kf_bin_open,
+	.llseek		= sysfs_kf_bin_llseek,
 };
 
 int sysfs_add_file_mode_ns(struct kernfs_node *parent,
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index 226cada23934..a56f0e9e7a59 100644
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -326,6 +326,7 @@ struct kernfs_ops {
 			 struct poll_table_struct *pt);
 
 	int (*mmap)(struct kernfs_open_file *of, struct vm_area_struct *vma);
+	loff_t (*llseek)(struct kernfs_open_file *of, loff_t offset, int whence);
 
 	CK_KABI_RESERVE(1)
 	CK_KABI_RESERVE(2)
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index e9e5e4de9b31..94627c2512b1 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -227,6 +227,8 @@ struct bin_attribute {
 			 char *, loff_t, size_t);
 	ssize_t (*write_new)(struct file *, struct kobject *,
 			     const struct bin_attribute *, char *, loff_t, size_t);
+	loff_t (*llseek)(struct file *, struct kobject *, struct bin_attribute *,
+			 loff_t, int);
 	int (*mmap)(struct file *, struct kobject *, struct bin_attribute *attr,
 		    struct vm_area_struct *vma);
 
-- 
Gitee


From 0b9e50cf96071f56ca465f86457a4e315d4bb8d4 Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@chromium.org>
Date: Tue, 12 Dec 2023 13:17:38 -0800
Subject: [PATCH 259/280] kernfs: Convert kernfs_walk_ns() from strlcpy() to
 strscpy()

ANBZ: #31045

commit 792e04768efbf2a1b49a7162a9fa06c1fa584723 upstream.

strlcpy() reads the entire source buffer first. This read may exceed
the destination size limit. This is both inefficient and can lead
to linear read overflows if a source string is not NUL-terminated[1].
Additionally, it returns the size of the source string, not the
resulting size of the destination string. In an effort to remove strlcpy()
completely[2], replace strlcpy() here with strscpy().

Intel-SIG: commit 792e04768efb kernfs: Convert kernfs_walk_ns() from strlcpy() to strscpy()
Backport Resctrl/RDT-SNC for Intel platforms

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy [1]
Link: https://github.com/KSPP/linux/issues/89 [2]
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Azeem Shaikh <azeemshaikh38@gmail.com>
Link: https://lore.kernel.org/r/20231116192127.1558276-1-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20231212211741.164376-1-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/kernfs/dir.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index f6e2a4523f7e..6b2d8ca1656b 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -871,16 +871,16 @@ static struct kernfs_node *kernfs_walk_ns(struct kernfs_node *parent,
 					  const unsigned char *path,
 					  const void *ns)
 {
-	size_t len;
+	ssize_t len;
 	char *p, *name;
 
 	lockdep_assert_held_read(&kernfs_root(parent)->kernfs_rwsem);
 
 	spin_lock_irq(&kernfs_pr_cont_lock);
 
-	len = strlcpy(kernfs_pr_cont_buf, path, sizeof(kernfs_pr_cont_buf));
+	len = strscpy(kernfs_pr_cont_buf, path, sizeof(kernfs_pr_cont_buf));
 
-	if (len >= sizeof(kernfs_pr_cont_buf)) {
+	if (len < 0) {
 		spin_unlock_irq(&kernfs_pr_cont_lock);
 		return NULL;
 	}
-- 
Gitee


From 86fa306403c4ae131cc9fe383b83ff0cfc8369f4 Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@chromium.org>
Date: Tue, 12 Dec 2023 13:17:39 -0800
Subject: [PATCH 260/280] kernfs: Convert kernfs_name_locked() from strlcpy()
 to strscpy()

ANBZ: #31045

commit 5b56bf5cdb8b7c989055fe4d73fe3f409427d1d5 upstream.

strlcpy() reads the entire source buffer first. This read may exceed
the destination size limit. This is both inefficient and can lead
to linear read overflows if a source string is not NUL-terminated[1].
Additionally, it returns the size of the source string, not the
resulting size of the destination string. In an effort to remove strlcpy()
completely[2], replace strlcpy() here with strscpy().

Nothing actually checks the return value coming from kernfs_name_locked(),
so this has no impact on error paths. The caller hierarchy is:

kernfs_name_locked()
        kernfs_name()
                pr_cont_kernfs_name()
                        return value ignored
                cgroup_name()
                        current_css_set_cg_links_read()
                                return value ignored
                        print_page_owner_memcg()
                                return value ignored

Intel-SIG: commit 5b56bf5cdb8b kernfs: Convert kernfs_name_locked() from strlcpy() to strscpy()
Backport Resctrl/RDT-SNC for Intel platforms

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy [1]
Link: https://github.com/KSPP/linux/issues/89 [2]
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Azeem Shaikh <azeemshaikh38@gmail.com>
Link: https://lore.kernel.org/r/20231116192127.1558276-2-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20231212211741.164376-2-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/kernfs/dir.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 6b2d8ca1656b..5dc90a498e75 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -54,9 +54,9 @@ static bool kernfs_lockdep(struct kernfs_node *kn)
 static int kernfs_name_locked(struct kernfs_node *kn, char *buf, size_t buflen)
 {
 	if (!kn)
-		return strlcpy(buf, "(null)", buflen);
+		return strscpy(buf, "(null)", buflen);
 
-	return strlcpy(buf, kn->parent ? kn->name : "/", buflen);
+	return strscpy(buf, kn->parent ? kn->name : "/", buflen);
 }
 
 /* kernfs_node_depth - compute depth from @from to @to */
@@ -184,12 +184,12 @@ static int kernfs_path_from_node_locked(struct kernfs_node *kn_to,
  * @buflen: size of @buf
  *
  * Copies the name of @kn into @buf of @buflen bytes.  The behavior is
- * similar to strlcpy().
+ * similar to strscpy().
  *
  * Fills buffer with "(null)" if @kn is %NULL.
  *
- * Return: the length of @kn's name and if @buf isn't long enough,
- * it's filled up to @buflen-1 and nul terminated.
+ * Return: the resulting length of @buf. If @buf isn't long enough,
+ * it's filled up to @buflen-1 and nul terminated, and returns -E2BIG.
  *
  * This function can be called from any context.
  */
-- 
Gitee


From 9407067ed958d56d367b8285dfd7e933f5ea5a44 Mon Sep 17 00:00:00 2001
From: Li zeming <zeming@nfschina.com>
Date: Mon, 15 Apr 2024 18:20:09 +0800
Subject: [PATCH 261/280] =?UTF-8?q?kernfs:=20mount:=20Remove=20unnecessary?=
 =?UTF-8?q?=20=E2=80=98NULL=E2=80=99=20values=20from=20knparent?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

ANBZ: #31045

commit 75cde4e37a14bdb8554c44cbc22354fc10fdf127 upstream.

knparent is assigned first, so it does not need to initialize the
assignment.

Intel-SIG: commit 75cde4e37a14 kernfs: mount: Remove unnecessary ‘NULL’ values from knparent
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Li zeming <zeming@nfschina.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20240415102009.9926-1-zeming@nfschina.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/kernfs/mount.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index 9aa3384856b7..9add22dae5ff 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -208,7 +208,7 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn,
 				  struct super_block *sb)
 {
 	struct dentry *dentry;
-	struct kernfs_node *knparent = NULL;
+	struct kernfs_node *knparent;
 
 	BUG_ON(sb->s_op != &kernfs_sops);
 
-- 
Gitee


From d0dad1c6a9b68d668ce6f52564a5ba2eaaedbad1 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 13 Feb 2025 15:50:18 +0100
Subject: [PATCH 262/280] kernfs: Acquire kernfs_rwsem in
 kernfs_notify_workfn().

ANBZ: #31045

commit 400188ae361a9d9a72a47a6cedaf2d2efcc84aa8 upstream.

kernfs_notify_workfn() dereferences kernfs_node::name and passes it
later to fsnotify(). If the node is renamed then the previously observed
name pointer becomes invalid.

Acquire kernfs_root::kernfs_rwsem to block renames of the node.

Intel-SIG: commit 400188ae361a kernfs: Acquire kernfs_rwsem in kernfs_notify_workfn().
Backport Resctrl/RDT-SNC for Intel platforms

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20250213145023.2820193-2-bigeasy@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/kernfs/file.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index bc3516c887e5..09c482eeb2b7 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -905,6 +905,7 @@ static void kernfs_notify_workfn(struct work_struct *work)
 	/* kick fsnotify */
 
 	down_read(&root->kernfs_supers_rwsem);
+	down_read(&root->kernfs_rwsem);
 	list_for_each_entry(info, &kernfs_root(kn)->supers, node) {
 		struct kernfs_node *parent;
 		struct inode *p_inode = NULL;
@@ -941,6 +942,7 @@ static void kernfs_notify_workfn(struct work_struct *work)
 		iput(inode);
 	}
 
+	up_read(&root->kernfs_rwsem);
 	up_read(&root->kernfs_supers_rwsem);
 	kernfs_put(kn);
 	goto repeat;
-- 
Gitee


From 73c769ab61deefd3773cc9e76f8efff54d17e850 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 13 Feb 2025 15:50:19 +0100
Subject: [PATCH 263/280] kernfs: Acquire kernfs_rwsem in
 kernfs_get_parent_dentry().

ANBZ: #31045

commit 122ab92dee80582c39740609a627198dd5b6b595 upstream.

kernfs_get_parent_dentry() passes kernfs_node::parent to
kernfs_get_inode().

Acquire kernfs_root::kernfs_rwsem to ensure kernfs_node::parent isn't
replaced during the operation.

Intel-SIG: commit 122ab92dee80 kernfs: Acquire kernfs_rwsem in kernfs_get_parent_dentry().
Backport Resctrl/RDT-SNC for Intel platforms

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20250213145023.2820193-3-bigeasy@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/kernfs/mount.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index 9add22dae5ff..583f77cbec1c 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -147,7 +147,9 @@ static struct dentry *kernfs_fh_to_parent(struct super_block *sb,
 static struct dentry *kernfs_get_parent_dentry(struct dentry *child)
 {
 	struct kernfs_node *kn = kernfs_dentry_node(child);
+	struct kernfs_root *root = kernfs_root(kn);
 
+	guard(rwsem_read)(&root->kernfs_rwsem);
 	return d_obtain_alias(kernfs_get_inode(child->d_sb, kn->parent));
 }
 
-- 
Gitee


From ff954927852b0ce09e47c29a3dfd8c85875381ae Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 13 Feb 2025 15:50:20 +0100
Subject: [PATCH 264/280] kernfs: Acquire kernfs_rwsem in kernfs_node_dentry().

ANBZ: #31045

commit 5b2fabf7fe8f745ff214ff003e6067b64f172271 upstream.

kernfs_node_dentry() passes kernfs_node::name to
lookup_positive_unlocked().

Acquire kernfs_root::kernfs_rwsem to ensure the node is not renamed
during the operation.

Intel-SIG: commit 5b2fabf7fe8f kernfs: Acquire kernfs_rwsem in kernfs_node_dentry().
Backport Resctrl/RDT-SNC for Intel platforms

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20250213145023.2820193-4-bigeasy@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/kernfs/mount.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index 583f77cbec1c..2db0aa259d97 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -211,6 +211,7 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn,
 {
 	struct dentry *dentry;
 	struct kernfs_node *knparent;
+	struct kernfs_root *root;
 
 	BUG_ON(sb->s_op != &kernfs_sops);
 
@@ -220,6 +221,9 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn,
 	if (!kn->parent)
 		return dentry;
 
+	root = kernfs_root(kn);
+	guard(rwsem_read)(&root->kernfs_rwsem);
+
 	knparent = find_next_ancestor(kn, NULL);
 	if (WARN_ON(!knparent)) {
 		dput(dentry);
-- 
Gitee


From 42e5cf8088149f667f9e30044e8ab0b219367193 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 13 Feb 2025 15:50:21 +0100
Subject: [PATCH 265/280] kernfs: Don't re-lock kernfs_root::kernfs_rwsem in
 kernfs_fop_readdir().

ANBZ: #31045

commit 9aab10a0249eab4ec77c6a5e4f66442610c12a09 upstream.

The readdir operation iterates over all entries and invokes dir_emit()
for every entry passing kernfs_node::name as argument.
Since the name argument can change, and become invalid, the
kernfs_root::kernfs_rwsem lock should not be dropped to prevent renames
during the operation.

The lock drop around dir_emit() has been initially introduced in commit
   1e5289c97bba2 ("sysfs: Cache the last sysfs_dirent to improve readdir scalability v2")

to avoid holding a global lock during a page fault. The lock drop is
wrong since the support of renames and not a big burden since the lock
is no longer global.

Don't re-acquire kernfs_root::kernfs_rwsem while copying the name to the
userpace buffer.

Intel-SIG: commit 9aab10a0249e kernfs: Don't re-lock kernfs_root::kernfs_rwsem in kernfs_fop_readdir().
Backport Resctrl/RDT-SNC for Intel platforms

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20250213145023.2820193-5-bigeasy@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/kernfs/dir.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 5dc90a498e75..8259b9df3da0 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -1869,10 +1869,10 @@ static int kernfs_fop_readdir(struct file *file, struct dir_context *ctx)
 		file->private_data = pos;
 		kernfs_get(pos);
 
-		up_read(&root->kernfs_rwsem);
-		if (!dir_emit(ctx, name, len, ino, type))
+		if (!dir_emit(ctx, name, len, ino, type)) {
+			up_read(&root->kernfs_rwsem);
 			return 0;
-		down_read(&root->kernfs_rwsem);
+		}
 	}
 	up_read(&root->kernfs_rwsem);
 	file->private_data = NULL;
-- 
Gitee


From a3e3f10e653375fea1617e514743cd03f3f0297e Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 13 Feb 2025 15:50:22 +0100
Subject: [PATCH 266/280] kernfs: Use RCU to access kernfs_node::parent.

ANBZ: #31045

commit 633488947ef66b194377411322dc9e12aab79b65 upstream.

kernfs_rename_lock is used to obtain stable kernfs_node::{name|parent}
pointer. This is a preparation to access kernfs_node::parent under RCU
and ensure that the pointer remains stable under the RCU lifetime
guarantees.

For a complete path, as it is done in kernfs_path_from_node(), the
kernfs_rename_lock is still required in order to obtain a stable parent
relationship while computing the relevant node depth. This must not
change while the nodes are inspected in order to build the path.
If the kernfs user never moves the nodes (changes the parent) then the
kernfs_rename_lock is not required and the RCU guarantees are
sufficient. This "restriction" can be set with
KERNFS_ROOT_INVARIANT_PARENT. Otherwise the lock is required.

Rename kernfs_node::parent to kernfs_node::__parent to denote the RCU
access and use RCU accessor while accessing the node.
Make cgroup use KERNFS_ROOT_INVARIANT_PARENT since the parent here can
not change.

Intel-SIG: commit 633488947ef6 kernfs: Use RCU to access kernfs_node::parent.
Backport Resctrl/RDT-SNC for Intel platforms

Acked-by: Tejun Heo <tj@kernel.org>
Cc: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20250213145023.2820193-6-bigeasy@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[jz: adapt anolis specific code to kernfs changes:
     - kernel/sched/group_balancer.c use RCU aware kn->__parent.
     - also make kn_priv() in kernel/cgroup/cgroup.c to be external, so that
       cgroup_pool_size_write() in kernel/cgroup/cgroup-v1.c can leverage]
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c        | 65 +++++++++----
 fs/kernfs/dir.c                               | 96 ++++++++++++-------
 fs/kernfs/kernfs-internal.h                   | 32 ++++++-
 fs/kernfs/mount.c                             | 10 +-
 fs/kernfs/symlink.c                           | 23 ++---
 fs/sysfs/file.c                               | 24 +++--
 include/linux/kernfs.h                        | 10 +-
 kernel/cgroup/cgroup-internal.h               |  1 +
 kernel/cgroup/cgroup-v1.c                     |  4 +-
 kernel/cgroup/cgroup.c                        | 24 ++++-
 kernel/sched/group_balancer.c                 | 12 ++-
 .../selftests/bpf/progs/profiler.inc.h        |  2 +-
 12 files changed, 208 insertions(+), 95 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 3da32b956a57..6cf27a5bc3d5 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1004,10 +1004,20 @@ static int rdt_last_cmd_status_show(struct kernfs_open_file *of,
 	return 0;
 }
 
+static void *rdt_kn_parent_priv(struct kernfs_node *kn)
+{
+	/*
+	 * The parent pointer is only valid within RCU section since it can be
+	 * replaced.
+	 */
+	guard(rcu)();
+	return rcu_dereference(kn->__parent)->priv;
+}
+
 static int rdt_num_closids_show(struct kernfs_open_file *of,
 				struct seq_file *seq, void *v)
 {
-	struct resctrl_schema *s = of->kn->parent->priv;
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
 
 	seq_printf(seq, "%u\n", s->num_closid);
 	return 0;
@@ -1016,7 +1026,7 @@ static int rdt_num_closids_show(struct kernfs_open_file *of,
 static int rdt_default_ctrl_show(struct kernfs_open_file *of,
 				 struct seq_file *seq, void *v)
 {
-	struct resctrl_schema *s = of->kn->parent->priv;
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
 	struct rdt_resource *r = s->res;
 
 	seq_printf(seq, "%x\n", resctrl_get_default_ctrl(r));
@@ -1026,7 +1036,7 @@ static int rdt_default_ctrl_show(struct kernfs_open_file *of,
 static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
 				 struct seq_file *seq, void *v)
 {
-	struct resctrl_schema *s = of->kn->parent->priv;
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
 	struct rdt_resource *r = s->res;
 
 	seq_printf(seq, "%u\n", r->cache.min_cbm_bits);
@@ -1036,7 +1046,7 @@ static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
 static int rdt_shareable_bits_show(struct kernfs_open_file *of,
 				   struct seq_file *seq, void *v)
 {
-	struct resctrl_schema *s = of->kn->parent->priv;
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
 	struct rdt_resource *r = s->res;
 
 	seq_printf(seq, "%x\n", r->cache.shareable_bits);
@@ -1060,7 +1070,7 @@ static int rdt_shareable_bits_show(struct kernfs_open_file *of,
 static int rdt_bit_usage_show(struct kernfs_open_file *of,
 			      struct seq_file *seq, void *v)
 {
-	struct resctrl_schema *s = of->kn->parent->priv;
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
 	/*
 	 * Use unsigned long even though only 32 bits are used to ensure
 	 * test_bit() is used safely.
@@ -1142,7 +1152,7 @@ static int rdt_bit_usage_show(struct kernfs_open_file *of,
 static int rdt_min_bw_show(struct kernfs_open_file *of,
 			   struct seq_file *seq, void *v)
 {
-	struct resctrl_schema *s = of->kn->parent->priv;
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
 	struct rdt_resource *r = s->res;
 
 	seq_printf(seq, "%u\n", r->membw.min_bw);
@@ -1152,7 +1162,7 @@ static int rdt_min_bw_show(struct kernfs_open_file *of,
 static int rdt_num_rmids_show(struct kernfs_open_file *of,
 			      struct seq_file *seq, void *v)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
 
 	seq_printf(seq, "%d\n", r->num_rmid);
 
@@ -1162,7 +1172,7 @@ static int rdt_num_rmids_show(struct kernfs_open_file *of,
 static int rdt_mon_features_show(struct kernfs_open_file *of,
 				 struct seq_file *seq, void *v)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
 	struct mon_evt *mevt;
 
 	list_for_each_entry(mevt, &r->evt_list, list) {
@@ -1177,7 +1187,7 @@ static int rdt_mon_features_show(struct kernfs_open_file *of,
 static int rdt_bw_gran_show(struct kernfs_open_file *of,
 			    struct seq_file *seq, void *v)
 {
-	struct resctrl_schema *s = of->kn->parent->priv;
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
 	struct rdt_resource *r = s->res;
 
 	seq_printf(seq, "%u\n", r->membw.bw_gran);
@@ -1187,7 +1197,7 @@ static int rdt_bw_gran_show(struct kernfs_open_file *of,
 static int rdt_delay_linear_show(struct kernfs_open_file *of,
 				 struct seq_file *seq, void *v)
 {
-	struct resctrl_schema *s = of->kn->parent->priv;
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
 	struct rdt_resource *r = s->res;
 
 	seq_printf(seq, "%u\n", r->membw.delay_linear);
@@ -1205,7 +1215,7 @@ static int max_threshold_occ_show(struct kernfs_open_file *of,
 static int rdt_thread_throttle_mode_show(struct kernfs_open_file *of,
 					 struct seq_file *seq, void *v)
 {
-	struct resctrl_schema *s = of->kn->parent->priv;
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
 	struct rdt_resource *r = s->res;
 
 	switch (r->membw.throttle_mode) {
@@ -1279,7 +1289,7 @@ static enum resctrl_conf_type resctrl_peer_type(enum resctrl_conf_type my_type)
 static int rdt_has_sparse_bitmasks_show(struct kernfs_open_file *of,
 					struct seq_file *seq, void *v)
 {
-	struct resctrl_schema *s = of->kn->parent->priv;
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
 	struct rdt_resource *r = s->res;
 
 	seq_printf(seq, "%u\n", r->cache.arch_has_sparse_bitmasks);
@@ -1705,7 +1715,7 @@ static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid
 static int mbm_total_bytes_config_show(struct kernfs_open_file *of,
 				       struct seq_file *seq, void *v)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
 
 	mbm_config_show(seq, r, QOS_L3_MBM_TOTAL_EVENT_ID);
 
@@ -1715,7 +1725,7 @@ static int mbm_total_bytes_config_show(struct kernfs_open_file *of,
 static int mbm_local_bytes_config_show(struct kernfs_open_file *of,
 				       struct seq_file *seq, void *v)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
 
 	mbm_config_show(seq, r, QOS_L3_MBM_LOCAL_EVENT_ID);
 
@@ -1822,7 +1832,7 @@ static ssize_t mbm_total_bytes_config_write(struct kernfs_open_file *of,
 					    char *buf, size_t nbytes,
 					    loff_t off)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
 	int ret;
 
 	/* Valid input requires a trailing newline */
@@ -1848,7 +1858,7 @@ static ssize_t mbm_local_bytes_config_write(struct kernfs_open_file *of,
 					    char *buf, size_t nbytes,
 					    loff_t off)
 {
-	struct rdt_resource *r = of->kn->parent->priv;
+	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
 	int ret;
 
 	/* Valid input requires a trailing newline */
@@ -2552,12 +2562,13 @@ static struct rdtgroup *kernfs_to_rdtgroup(struct kernfs_node *kn)
 		 * resource. "info" and its subdirectories don't
 		 * have rdtgroup structures, so return NULL here.
 		 */
-		if (kn == kn_info || kn->parent == kn_info)
+		if (kn == kn_info ||
+		    rcu_access_pointer(kn->__parent) == kn_info)
 			return NULL;
 		else
 			return kn->priv;
 	} else {
-		return kn->parent->priv;
+		return rdt_kn_parent_priv(kn);
 	}
 }
 
@@ -3980,9 +3991,18 @@ static int rdtgroup_rmdir_ctrl(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
 	return 0;
 }
 
+static struct kernfs_node *rdt_kn_parent(struct kernfs_node *kn)
+{
+	/*
+	 * Valid within the RCU section it was obtained or while rdtgroup_mutex
+	 * is held.
+	 */
+	return rcu_dereference_check(kn->__parent, lockdep_is_held(&rdtgroup_mutex));
+}
+
 static int rdtgroup_rmdir(struct kernfs_node *kn)
 {
-	struct kernfs_node *parent_kn = kn->parent;
+	struct kernfs_node *parent_kn;
 	struct rdtgroup *rdtgrp;
 	cpumask_var_t tmpmask;
 	int ret = 0;
@@ -3995,6 +4015,7 @@ static int rdtgroup_rmdir(struct kernfs_node *kn)
 		ret = -EPERM;
 		goto out;
 	}
+	parent_kn = rdt_kn_parent(kn);
 
 	/*
 	 * If the rdtgroup is a ctrl_mon group and parent directory
@@ -4063,6 +4084,7 @@ static void mongrp_reparent(struct rdtgroup *rdtgrp,
 static int rdtgroup_rename(struct kernfs_node *kn,
 			   struct kernfs_node *new_parent, const char *new_name)
 {
+	struct kernfs_node *kn_parent;
 	struct rdtgroup *new_prdtgrp;
 	struct rdtgroup *rdtgrp;
 	cpumask_var_t tmpmask;
@@ -4097,8 +4119,9 @@ static int rdtgroup_rename(struct kernfs_node *kn,
 		goto out;
 	}
 
-	if (rdtgrp->type != RDTMON_GROUP || !kn->parent ||
-	    !is_mon_groups(kn->parent, kn->name)) {
+	kn_parent = rdt_kn_parent(kn);
+	if (rdtgrp->type != RDTMON_GROUP || !kn_parent ||
+	    !is_mon_groups(kn_parent, kn->name)) {
 		rdt_last_cmd_puts("Source must be a MON group\n");
 		ret = -EPERM;
 		goto out;
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 8259b9df3da0..92cdbdfd2cf0 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -17,7 +17,7 @@
 
 #include "kernfs-internal.h"
 
-static DEFINE_RWLOCK(kernfs_rename_lock);	/* kn->parent and ->name */
+DEFINE_RWLOCK(kernfs_rename_lock);	/* kn->parent and ->name */
 /*
  * Don't use rename_lock to piggy back on pr_cont_buf. We don't want to
  * call pr_cont() while holding rename_lock. Because sometimes pr_cont()
@@ -56,7 +56,7 @@ static int kernfs_name_locked(struct kernfs_node *kn, char *buf, size_t buflen)
 	if (!kn)
 		return strscpy(buf, "(null)", buflen);
 
-	return strscpy(buf, kn->parent ? kn->name : "/", buflen);
+	return strscpy(buf, rcu_access_pointer(kn->__parent) ? kn->name : "/", buflen);
 }
 
 /* kernfs_node_depth - compute depth from @from to @to */
@@ -64,9 +64,9 @@ static size_t kernfs_depth(struct kernfs_node *from, struct kernfs_node *to)
 {
 	size_t depth = 0;
 
-	while (to->parent && to != from) {
+	while (rcu_dereference(to->__parent) && to != from) {
 		depth++;
-		to = to->parent;
+		to = rcu_dereference(to->__parent);
 	}
 	return depth;
 }
@@ -84,18 +84,18 @@ static struct kernfs_node *kernfs_common_ancestor(struct kernfs_node *a,
 	db = kernfs_depth(rb->kn, b);
 
 	while (da > db) {
-		a = a->parent;
+		a = rcu_dereference(a->__parent);
 		da--;
 	}
 	while (db > da) {
-		b = b->parent;
+		b = rcu_dereference(b->__parent);
 		db--;
 	}
 
 	/* worst case b and a will be the same at root */
 	while (b != a) {
-		b = b->parent;
-		a = a->parent;
+		b = rcu_dereference(b->__parent);
+		a = rcu_dereference(a->__parent);
 	}
 
 	return a;
@@ -168,8 +168,9 @@ static int kernfs_path_from_node_locked(struct kernfs_node *kn_to,
 
 	/* Calculate how many bytes we need for the rest */
 	for (i = depth_to - 1; i >= 0; i--) {
+
 		for (kn = kn_to, j = 0; j < i; j++)
-			kn = kn->parent;
+			kn = rcu_dereference(kn->__parent);
 
 		len += scnprintf(buf + len, buflen - len, "/%s", kn->name);
 	}
@@ -226,6 +227,7 @@ int kernfs_path_from_node(struct kernfs_node *to, struct kernfs_node *from,
 	unsigned long flags;
 	int ret;
 
+	guard(rcu)();
 	read_lock_irqsave(&kernfs_rename_lock, flags);
 	ret = kernfs_path_from_node_locked(to, from, buf, buflen);
 	read_unlock_irqrestore(&kernfs_rename_lock, flags);
@@ -295,7 +297,7 @@ struct kernfs_node *kernfs_get_parent(struct kernfs_node *kn)
 	unsigned long flags;
 
 	read_lock_irqsave(&kernfs_rename_lock, flags);
-	parent = kn->parent;
+	parent = kernfs_parent(kn);
 	kernfs_get(parent);
 	read_unlock_irqrestore(&kernfs_rename_lock, flags);
 
@@ -360,8 +362,12 @@ static int kernfs_sd_compare(const struct kernfs_node *left,
  */
 static int kernfs_link_sibling(struct kernfs_node *kn)
 {
-	struct rb_node **node = &kn->parent->dir.children.rb_node;
 	struct rb_node *parent = NULL;
+	struct kernfs_node *kn_parent;
+	struct rb_node **node;
+
+	kn_parent = kernfs_parent(kn);
+	node = &kn_parent->dir.children.rb_node;
 
 	while (*node) {
 		struct kernfs_node *pos;
@@ -380,13 +386,13 @@ static int kernfs_link_sibling(struct kernfs_node *kn)
 
 	/* add new node and rebalance the tree */
 	rb_link_node(&kn->rb, parent, node);
-	rb_insert_color(&kn->rb, &kn->parent->dir.children);
+	rb_insert_color(&kn->rb, &kn_parent->dir.children);
 
 	/* successfully added, account subdir number */
 	down_write(&kernfs_root(kn)->kernfs_iattr_rwsem);
 	if (kernfs_type(kn) == KERNFS_DIR)
-		kn->parent->dir.subdirs++;
-	kernfs_inc_rev(kn->parent);
+		kn_parent->dir.subdirs++;
+	kernfs_inc_rev(kn_parent);
 	up_write(&kernfs_root(kn)->kernfs_iattr_rwsem);
 
 	return 0;
@@ -407,16 +413,19 @@ static int kernfs_link_sibling(struct kernfs_node *kn)
  */
 static bool kernfs_unlink_sibling(struct kernfs_node *kn)
 {
+	struct kernfs_node *kn_parent;
+
 	if (RB_EMPTY_NODE(&kn->rb))
 		return false;
 
+	kn_parent = kernfs_parent(kn);
 	down_write(&kernfs_root(kn)->kernfs_iattr_rwsem);
 	if (kernfs_type(kn) == KERNFS_DIR)
-		kn->parent->dir.subdirs--;
-	kernfs_inc_rev(kn->parent);
+		kn_parent->dir.subdirs--;
+	kernfs_inc_rev(kn_parent);
 	up_write(&kernfs_root(kn)->kernfs_iattr_rwsem);
 
-	rb_erase(&kn->rb, &kn->parent->dir.children);
+	rb_erase(&kn->rb, &kn_parent->dir.children);
 	RB_CLEAR_NODE(&kn->rb);
 	return true;
 }
@@ -562,7 +571,7 @@ void kernfs_put(struct kernfs_node *kn)
 	 * Moving/renaming is always done while holding reference.
 	 * kn->parent won't change beneath us.
 	 */
-	parent = kn->parent;
+	parent = kernfs_parent(kn);
 
 	WARN_ONCE(atomic_read(&kn->active) != KN_DEACTIVATED_BIAS,
 		  "kernfs_put: %s/%s: released with incorrect active_ref %d\n",
@@ -701,7 +710,7 @@ struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
 			       name, mode, uid, gid, flags);
 	if (kn) {
 		kernfs_get(parent);
-		kn->parent = parent;
+		rcu_assign_pointer(kn->__parent, parent);
 	}
 	return kn;
 }
@@ -769,13 +778,14 @@ struct kernfs_node *kernfs_find_and_get_node_by_id(struct kernfs_root *root,
  */
 int kernfs_add_one(struct kernfs_node *kn)
 {
-	struct kernfs_node *parent = kn->parent;
-	struct kernfs_root *root = kernfs_root(parent);
+	struct kernfs_root *root = kernfs_root(kn);
 	struct kernfs_iattrs *ps_iattr;
+	struct kernfs_node *parent;
 	bool has_ns;
 	int ret;
 
 	down_write(&root->kernfs_rwsem);
+	parent = kernfs_parent(kn);
 
 	ret = -EINVAL;
 	has_ns = kernfs_ns_enabled(parent);
@@ -949,6 +959,11 @@ struct kernfs_node *kernfs_walk_and_get_ns(struct kernfs_node *parent,
 	return kn;
 }
 
+unsigned int kernfs_root_flags(struct kernfs_node *kn)
+{
+	return kernfs_root(kn)->flags;
+}
+
 /**
  * kernfs_create_root - create a new kernfs hierarchy
  * @scops: optional syscall operations for the hierarchy
@@ -1111,7 +1126,7 @@ struct kernfs_node *kernfs_create_empty_dir(struct kernfs_node *parent,
 
 static int kernfs_dop_revalidate(struct dentry *dentry, unsigned int flags)
 {
-	struct kernfs_node *kn;
+	struct kernfs_node *kn, *parent;
 	struct kernfs_root *root;
 
 	if (flags & LOOKUP_RCU)
@@ -1162,8 +1177,9 @@ static int kernfs_dop_revalidate(struct dentry *dentry, unsigned int flags)
 	if (!kernfs_active(kn))
 		goto out_bad;
 
+	parent = kernfs_parent(kn);
 	/* The kernfs node has been moved? */
-	if (kernfs_dentry_node(dentry->d_parent) != kn->parent)
+	if (kernfs_dentry_node(dentry->d_parent) != parent)
 		goto out_bad;
 
 	/* The kernfs node has been renamed */
@@ -1171,7 +1187,7 @@ static int kernfs_dop_revalidate(struct dentry *dentry, unsigned int flags)
 		goto out_bad;
 
 	/* The kernfs node has been moved to a different namespace */
-	if (kn->parent && kernfs_ns_enabled(kn->parent) &&
+	if (parent && kernfs_ns_enabled(parent) &&
 	    kernfs_info(dentry->d_sb)->ns != kn->ns)
 		goto out_bad;
 
@@ -1364,7 +1380,7 @@ static struct kernfs_node *kernfs_next_descendant_post(struct kernfs_node *pos,
 		return kernfs_leftmost_descendant(rb_to_kn(rbn));
 
 	/* no sibling left, visit parent */
-	return pos->parent;
+	return kernfs_parent(pos);
 }
 
 static void kernfs_activate_one(struct kernfs_node *kn)
@@ -1376,7 +1392,7 @@ static void kernfs_activate_one(struct kernfs_node *kn)
 	if (kernfs_active(kn) || (kn->flags & (KERNFS_HIDDEN | KERNFS_REMOVING)))
 		return;
 
-	WARN_ON_ONCE(kn->parent && RB_EMPTY_NODE(&kn->rb));
+	WARN_ON_ONCE(rcu_access_pointer(kn->__parent) && RB_EMPTY_NODE(&kn->rb));
 	WARN_ON_ONCE(atomic_read(&kn->active) != KN_DEACTIVATED_BIAS);
 
 	atomic_sub(KN_DEACTIVATED_BIAS, &kn->active);
@@ -1446,7 +1462,7 @@ void kernfs_show(struct kernfs_node *kn, bool show)
 
 static void __kernfs_remove(struct kernfs_node *kn)
 {
-	struct kernfs_node *pos;
+	struct kernfs_node *pos, *parent;
 
 	/* Short-circuit if non-root @kn has already finished removal. */
 	if (!kn)
@@ -1458,7 +1474,7 @@ static void __kernfs_remove(struct kernfs_node *kn)
 	 * This is for kernfs_remove_self() which plays with active ref
 	 * after removal.
 	 */
-	if (kn->parent && RB_EMPTY_NODE(&kn->rb))
+	if (kernfs_parent(kn) && RB_EMPTY_NODE(&kn->rb))
 		return;
 
 	pr_debug("kernfs %s: removing\n", kn->name);
@@ -1484,14 +1500,14 @@ static void __kernfs_remove(struct kernfs_node *kn)
 		kernfs_get(pos);
 
 		kernfs_drain(pos);
-
+		parent = kernfs_parent(pos);
 		/*
 		 * kernfs_unlink_sibling() succeeds once per node.  Use it
 		 * to decide who's responsible for cleanups.
 		 */
-		if (!pos->parent || kernfs_unlink_sibling(pos)) {
+		if (!parent || kernfs_unlink_sibling(pos)) {
 			struct kernfs_iattrs *ps_iattr =
-				pos->parent ? pos->parent->iattr : NULL;
+				parent ? parent->iattr : NULL;
 
 			/* update timestamps on the parent */
 			down_write(&kernfs_root(kn)->kernfs_iattr_rwsem);
@@ -1722,7 +1738,7 @@ int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent,
 	int error;
 
 	/* can't move or rename root */
-	if (!kn->parent)
+	if (!rcu_access_pointer(kn->__parent))
 		return -EINVAL;
 
 	root = kernfs_root(kn);
@@ -1733,8 +1749,15 @@ int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent,
 	    (new_parent->flags & KERNFS_EMPTY_DIR))
 		goto out;
 
+	old_parent = kernfs_parent(kn);
+	if (root->flags & KERNFS_ROOT_INVARIANT_PARENT) {
+		error = -EINVAL;
+		if (WARN_ON_ONCE(old_parent != new_parent))
+			goto out;
+	}
+
 	error = 0;
-	if ((kn->parent == new_parent) && (kn->ns == new_ns) &&
+	if ((old_parent == new_parent) && (kn->ns == new_ns) &&
 	    (strcmp(kn->name, new_name) == 0))
 		goto out;	/* nothing to rename */
 
@@ -1761,8 +1784,8 @@ int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent,
 	/* rename_lock protects ->parent and ->name accessors */
 	write_lock_irq(&kernfs_rename_lock);
 
-	old_parent = kn->parent;
-	kn->parent = new_parent;
+	old_parent = kernfs_parent(kn);
+	rcu_assign_pointer(kn->__parent, new_parent);
 
 	kn->ns = new_ns;
 	if (new_name) {
@@ -1795,7 +1818,8 @@ static struct kernfs_node *kernfs_dir_pos(const void *ns,
 {
 	if (pos) {
 		int valid = kernfs_active(pos) &&
-			pos->parent == parent && hash == pos->hash;
+			rcu_access_pointer(pos->__parent) == parent &&
+			hash == pos->hash;
 		kernfs_put(pos);
 		if (!valid)
 			pos = NULL;
diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h
index 210dac7e9ee2..dbcf24c30a3d 100644
--- a/fs/kernfs/kernfs-internal.h
+++ b/fs/kernfs/kernfs-internal.h
@@ -19,6 +19,8 @@
 #include <linux/kernfs.h>
 #include <linux/fs_context.h>
 
+extern rwlock_t kernfs_rename_lock;
+
 struct kernfs_iattrs {
 	kuid_t			ia_uid;
 	kgid_t			ia_gid;
@@ -64,11 +66,14 @@ struct kernfs_root {
  *
  * Return: the kernfs_root @kn belongs to.
  */
-static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn)
+static inline struct kernfs_root *kernfs_root(const struct kernfs_node *kn)
 {
+	const struct kernfs_node *knp;
 	/* if parent exists, it's always a dir; otherwise, @sd is a dir */
-	if (kn->parent)
-		kn = kn->parent;
+	guard(rcu)();
+	knp = rcu_dereference(kn->__parent);
+	if (knp)
+		kn = knp;
 	return kn->dir.root;
 }
 
@@ -97,6 +102,27 @@ struct kernfs_super_info {
 };
 #define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info))
 
+static inline bool kernfs_root_is_locked(const struct kernfs_node *kn)
+{
+	return lockdep_is_held(&kernfs_root(kn)->kernfs_rwsem);
+}
+
+static inline struct kernfs_node *kernfs_parent(const struct kernfs_node *kn)
+{
+	/*
+	 * The kernfs_node::__parent remains valid within a RCU section. The kn
+	 * can be reparented (and renamed) which changes the entry. This can be
+	 * avoided by locking kernfs_root::kernfs_rwsem or kernfs_rename_lock.
+	 * Both locks can be used to obtain a reference on __parent. Once the
+	 * reference count reaches 0 then the node is about to be freed
+	 * and can not be renamed (or become a different parent) anymore.
+	 */
+	return rcu_dereference_check(kn->__parent,
+				     kernfs_root_is_locked(kn) ||
+				     lockdep_is_held(&kernfs_rename_lock) ||
+				     !atomic_read(&kn->count));
+}
+
 static inline struct kernfs_node *kernfs_dentry_node(struct dentry *dentry)
 {
 	if (d_really_is_negative(dentry))
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index 2db0aa259d97..32934cae08cb 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -150,7 +150,7 @@ static struct dentry *kernfs_get_parent_dentry(struct dentry *child)
 	struct kernfs_root *root = kernfs_root(kn);
 
 	guard(rwsem_read)(&root->kernfs_rwsem);
-	return d_obtain_alias(kernfs_get_inode(child->d_sb, kn->parent));
+	return d_obtain_alias(kernfs_get_inode(child->d_sb, kernfs_parent(kn)));
 }
 
 static const struct export_operations kernfs_export_ops = {
@@ -190,10 +190,10 @@ static struct kernfs_node *find_next_ancestor(struct kernfs_node *child,
 		return NULL;
 	}
 
-	while (child->parent != parent) {
-		if (!child->parent)
+	while (kernfs_parent(child) != parent) {
+		child = kernfs_parent(child);
+		if (!child)
 			return NULL;
-		child = child->parent;
 	}
 
 	return child;
@@ -218,7 +218,7 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn,
 	dentry = dget(sb->s_root);
 
 	/* Check if this is the root kernfs_node */
-	if (!kn->parent)
+	if (!rcu_access_pointer(kn->__parent))
 		return dentry;
 
 	root = kernfs_root(kn);
diff --git a/fs/kernfs/symlink.c b/fs/kernfs/symlink.c
index 45371a70caa7..05c62ca93c53 100644
--- a/fs/kernfs/symlink.c
+++ b/fs/kernfs/symlink.c
@@ -62,10 +62,10 @@ static int kernfs_get_target_path(struct kernfs_node *parent,
 
 	/* go up to the root, stop at the base */
 	base = parent;
-	while (base->parent) {
-		kn = target->parent;
-		while (kn->parent && base != kn)
-			kn = kn->parent;
+	while (kernfs_parent(base)) {
+		kn = kernfs_parent(target);
+		while (kernfs_parent(kn) && base != kn)
+			kn = kernfs_parent(kn);
 
 		if (base == kn)
 			break;
@@ -75,14 +75,14 @@ static int kernfs_get_target_path(struct kernfs_node *parent,
 
 		strcpy(s, "../");
 		s += 3;
-		base = base->parent;
+		base = kernfs_parent(base);
 	}
 
 	/* determine end of target string for reverse fillup */
 	kn = target;
-	while (kn->parent && kn != base) {
+	while (kernfs_parent(kn) && kn != base) {
 		len += strlen(kn->name) + 1;
-		kn = kn->parent;
+		kn = kernfs_parent(kn);
 	}
 
 	/* check limits */
@@ -94,7 +94,7 @@ static int kernfs_get_target_path(struct kernfs_node *parent,
 
 	/* reverse fillup of target string from target to base */
 	kn = target;
-	while (kn->parent && kn != base) {
+	while (kernfs_parent(kn) && kn != base) {
 		int slen = strlen(kn->name);
 
 		len -= slen;
@@ -102,7 +102,7 @@ static int kernfs_get_target_path(struct kernfs_node *parent,
 		if (len)
 			s[--len] = '/';
 
-		kn = kn->parent;
+		kn = kernfs_parent(kn);
 	}
 
 	return 0;
@@ -111,12 +111,13 @@ static int kernfs_get_target_path(struct kernfs_node *parent,
 static int kernfs_getlink(struct inode *inode, char *path)
 {
 	struct kernfs_node *kn = inode->i_private;
-	struct kernfs_node *parent = kn->parent;
+	struct kernfs_node *parent;
 	struct kernfs_node *target = kn->symlink.target_kn;
-	struct kernfs_root *root = kernfs_root(parent);
+	struct kernfs_root *root = kernfs_root(kn);
 	int error;
 
 	down_read(&root->kernfs_rwsem);
+	parent = kernfs_parent(kn);
 	error = kernfs_get_target_path(parent, target, path);
 	up_read(&root->kernfs_rwsem);
 
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index a7830f5dfb76..a6390ff32210 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -19,13 +19,19 @@
 
 #include "sysfs.h"
 
+static struct kobject *sysfs_file_kobj(struct kernfs_node *kn)
+{
+	guard(rcu)();
+	return rcu_dereference(kn->__parent)->priv;
+}
+
 /*
  * Determine ktype->sysfs_ops for the given kernfs_node.  This function
  * must be called while holding an active reference.
  */
 static const struct sysfs_ops *sysfs_file_ops(struct kernfs_node *kn)
 {
-	struct kobject *kobj = kn->parent->priv;
+	struct kobject *kobj = sysfs_file_kobj(kn);
 
 	if (kn->flags & KERNFS_LOCKDEP)
 		lockdep_assert_held(kn);
@@ -40,7 +46,7 @@ static const struct sysfs_ops *sysfs_file_ops(struct kernfs_node *kn)
 static int sysfs_kf_seq_show(struct seq_file *sf, void *v)
 {
 	struct kernfs_open_file *of = sf->private;
-	struct kobject *kobj = of->kn->parent->priv;
+	struct kobject *kobj = sysfs_file_kobj(of->kn);
 	const struct sysfs_ops *ops = sysfs_file_ops(of->kn);
 	ssize_t count;
 	char *buf;
@@ -78,7 +84,7 @@ static ssize_t sysfs_kf_bin_read(struct kernfs_open_file *of, char *buf,
 				 size_t count, loff_t pos)
 {
 	struct bin_attribute *battr = of->kn->priv;
-	struct kobject *kobj = of->kn->parent->priv;
+	struct kobject *kobj = sysfs_file_kobj(of->kn);
 	loff_t size = file_inode(of->file)->i_size;
 
 	if (!count)
@@ -105,7 +111,7 @@ static ssize_t sysfs_kf_read(struct kernfs_open_file *of, char *buf,
 			     size_t count, loff_t pos)
 {
 	const struct sysfs_ops *ops = sysfs_file_ops(of->kn);
-	struct kobject *kobj = of->kn->parent->priv;
+	struct kobject *kobj = sysfs_file_kobj(of->kn);
 	ssize_t len;
 
 	/*
@@ -131,7 +137,7 @@ static ssize_t sysfs_kf_write(struct kernfs_open_file *of, char *buf,
 			      size_t count, loff_t pos)
 {
 	const struct sysfs_ops *ops = sysfs_file_ops(of->kn);
-	struct kobject *kobj = of->kn->parent->priv;
+	struct kobject *kobj = sysfs_file_kobj(of->kn);
 
 	if (!count)
 		return 0;
@@ -144,7 +150,7 @@ static ssize_t sysfs_kf_bin_write(struct kernfs_open_file *of, char *buf,
 				  size_t count, loff_t pos)
 {
 	struct bin_attribute *battr = of->kn->priv;
-	struct kobject *kobj = of->kn->parent->priv;
+	struct kobject *kobj = sysfs_file_kobj(of->kn);
 	loff_t size = file_inode(of->file)->i_size;
 
 	if (size) {
@@ -168,7 +174,7 @@ static int sysfs_kf_bin_mmap(struct kernfs_open_file *of,
 			     struct vm_area_struct *vma)
 {
 	struct bin_attribute *battr = of->kn->priv;
-	struct kobject *kobj = of->kn->parent->priv;
+	struct kobject *kobj = sysfs_file_kobj(of->kn);
 
 	return battr->mmap(of->file, kobj, battr, vma);
 }
@@ -177,7 +183,7 @@ static loff_t sysfs_kf_bin_llseek(struct kernfs_open_file *of, loff_t offset,
 				  int whence)
 {
 	struct bin_attribute *battr = of->kn->priv;
-	struct kobject *kobj = of->kn->parent->priv;
+	struct kobject *kobj = sysfs_file_kobj(of->kn);
 
 	if (battr->llseek)
 		return battr->llseek(of->file, kobj, battr, offset, whence);
@@ -494,7 +500,7 @@ EXPORT_SYMBOL_GPL(sysfs_break_active_protection);
  */
 void sysfs_unbreak_active_protection(struct kernfs_node *kn)
 {
-	struct kobject *kobj = kn->parent->priv;
+	struct kobject *kobj = sysfs_file_kobj(kn);
 
 	kernfs_unbreak_active_protection(kn);
 	kernfs_put(kn);
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index a56f0e9e7a59..7e296d6f85a5 100644
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -148,6 +148,11 @@ enum kernfs_root_flag {
 	 * Support user xattrs to be written to nodes rooted at this root.
 	 */
 	KERNFS_ROOT_SUPPORT_USER_XATTR		= 0x0008,
+
+	/*
+	 * Renames must not change the parent node.
+	 */
+	KERNFS_ROOT_INVARIANT_PARENT		= 0x0010,
 };
 
 /* type-specific structures for kernfs_node union members */
@@ -202,8 +207,8 @@ struct kernfs_node {
 	 * never moved to a different parent, it is safe to access the
 	 * parent directly.
 	 */
-	struct kernfs_node	*parent;
 	const char		*name;
+	struct kernfs_node	__rcu *__parent;
 
 	struct rb_node		rb;
 
@@ -427,6 +432,7 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn,
 struct kernfs_root *kernfs_create_root(struct kernfs_syscall_ops *scops,
 				       unsigned int flags, void *priv);
 void kernfs_destroy_root(struct kernfs_root *root);
+unsigned int kernfs_root_flags(struct kernfs_node *kn);
 
 struct kernfs_node *kernfs_create_dir_ns(struct kernfs_node *parent,
 					 const char *name, umode_t mode,
@@ -525,6 +531,8 @@ kernfs_create_root(struct kernfs_syscall_ops *scops, unsigned int flags,
 { return ERR_PTR(-ENOSYS); }
 
 static inline void kernfs_destroy_root(struct kernfs_root *root) { }
+static inline unsigned int kernfs_root_flags(struct kernfs_node *kn)
+{ return 0; }
 
 static inline struct kernfs_node *
 kernfs_create_dir_ns(struct kernfs_node *parent, const char *name,
diff --git a/kernel/cgroup/cgroup-internal.h b/kernel/cgroup/cgroup-internal.h
index 85be02fde19b..9d4a477bbd37 100644
--- a/kernel/cgroup/cgroup-internal.h
+++ b/kernel/cgroup/cgroup-internal.h
@@ -223,6 +223,7 @@ static inline void get_css_set(struct css_set *cset)
 
 bool cgroup_ssid_enabled(int ssid);
 
+struct cgroup *kn_priv(struct kernfs_node *kn);
 struct cgroup_root *cgroup_root_from_kf(struct kernfs_root *kf_root);
 struct cgroup *task_cgroup_from_root(struct task_struct *task,
 				     struct cgroup_root *root);
diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index 8be798cd9896..cbe0ae63db37 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -635,7 +635,7 @@ static ssize_t cgroup_pool_size_write(struct kernfs_open_file *of,
 	u64 val;
 	int i;
 
-	cgrp = of->kn->parent->priv;
+	cgrp = kn_priv(of->kn);
 
 	if (kstrtoull(buf, 0, &val))
 		return -EINVAL;
@@ -942,7 +942,7 @@ static int cgroup1_rename(struct kernfs_node *kn, struct kernfs_node *new_parent
 
 	if (kernfs_type(kn) != KERNFS_DIR)
 		return -ENOTDIR;
-	if (kn->parent != new_parent)
+	if (rcu_access_pointer(kn->__parent) != new_parent)
 		return -EIO;
 
 	/*
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 0a0a11f88bd4..9b229efacaa5 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -646,9 +646,22 @@ int cgroup_task_count(const struct cgroup *cgrp)
 	return count;
 }
 
+struct cgroup *kn_priv(struct kernfs_node *kn)
+{
+	struct kernfs_node *parent;
+	/*
+	 * The parent can not be replaced due to KERNFS_ROOT_INVARIANT_PARENT.
+	 * Therefore it is always safe to dereference this pointer outside of a
+	 * RCU section.
+	 */
+	parent = rcu_dereference_check(kn->__parent,
+				       kernfs_root_flags(kn) & KERNFS_ROOT_INVARIANT_PARENT);
+	return parent->priv;
+}
+
 struct cgroup_subsys_state *of_css(struct kernfs_open_file *of)
 {
-	struct cgroup *cgrp = of->kn->parent->priv;
+	struct cgroup *cgrp = kn_priv(of->kn);
 	struct cftype *cft = of_cft(of);
 
 	/*
@@ -1635,7 +1648,7 @@ void cgroup_kn_unlock(struct kernfs_node *kn)
 	if (kernfs_type(kn) == KERNFS_DIR)
 		cgrp = kn->priv;
 	else
-		cgrp = kn->parent->priv;
+		cgrp = kn_priv(kn);
 
 	cgroup_unlock();
 
@@ -1667,7 +1680,7 @@ struct cgroup *cgroup_kn_lock_live(struct kernfs_node *kn, bool drain_offline)
 	if (kernfs_type(kn) == KERNFS_DIR)
 		cgrp = kn->priv;
 	else
-		cgrp = kn->parent->priv;
+		cgrp = kn_priv(kn);
 
 	/*
 	 * We're gonna grab cgroup_mutex which nests outside kernfs
@@ -2109,7 +2122,8 @@ int cgroup_setup_root(struct cgroup_root *root, u16 ss_mask)
 	root->kf_root = kernfs_create_root(kf_sops,
 					   KERNFS_ROOT_CREATE_DEACTIVATED |
 					   KERNFS_ROOT_SUPPORT_EXPORTOP |
-					   KERNFS_ROOT_SUPPORT_USER_XATTR,
+					   KERNFS_ROOT_SUPPORT_USER_XATTR |
+					   KERNFS_ROOT_INVARIANT_PARENT,
 					   root_cgrp);
 	if (IS_ERR(root->kf_root)) {
 		ret = PTR_ERR(root->kf_root);
@@ -4175,7 +4189,7 @@ static ssize_t cgroup_file_write(struct kernfs_open_file *of, char *buf,
 				 size_t nbytes, loff_t off)
 {
 	struct cgroup_file_ctx *ctx = of->priv;
-	struct cgroup *cgrp = of->kn->parent->priv;
+	struct cgroup *cgrp = kn_priv(of->kn);
 	struct cftype *cft = of_cft(of);
 	struct cgroup_subsys_state *css;
 	int ret;
diff --git a/kernel/sched/group_balancer.c b/kernel/sched/group_balancer.c
index de46b2a0d758..3a5839f21eff 100644
--- a/kernel/sched/group_balancer.c
+++ b/kernel/sched/group_balancer.c
@@ -331,12 +331,22 @@ static const struct kernfs_ops group_balancer_kf_single_ops = {
 	.seq_show		= group_balancer_seqfile_show,
 };
 
+static struct group_balancer_sched_domain *kn_parent_priv(struct kernfs_node *kn)
+{
+	/*
+	 * The parent pointer is only valid within RCU section since it can be
+	 * replaced
+	 */
+	guard(rcu)();
+	return rcu_dereference(kn->__parent)->priv;
+}
+
 struct group_balancer_sched_domain *kernfs_to_gb_sd(struct kernfs_node *kn)
 {
 	if (kernfs_type(kn) == KERNFS_DIR)
 		return kn->priv;
 	else
-		return kn->parent->priv;
+		return kn_parent_priv(kn);
 }
 
 struct group_balancer_sched_domain *group_balancer_kn_lock_live(struct kernfs_node *kn)
diff --git a/tools/testing/selftests/bpf/progs/profiler.inc.h b/tools/testing/selftests/bpf/progs/profiler.inc.h
index f799d87e8700..cf5d64af07cf 100644
--- a/tools/testing/selftests/bpf/progs/profiler.inc.h
+++ b/tools/testing/selftests/bpf/progs/profiler.inc.h
@@ -225,7 +225,7 @@ static INLINE void* read_full_cgroup_path(struct kernfs_node* cgroup_node,
 			barrier_var(filepart_length);
 			payload += filepart_length;
 		}
-		cgroup_node = BPF_CORE_READ(cgroup_node, parent);
+		cgroup_node = BPF_CORE_READ(cgroup_node, __parent);
 	}
 	return payload;
 }
-- 
Gitee


From 3715686cf576236ab82c80b0c86e289f2d1ec23b Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 13 Feb 2025 15:50:23 +0100
Subject: [PATCH 267/280] kernfs: Use RCU to access kernfs_node::name.

ANBZ: #31045

commit 741c10b096bc4dd79cd9f215b6ef173bb953e75c upstream.

Using RCU lifetime rules to access kernfs_node::name can avoid the
trouble with kernfs_rename_lock in kernfs_name() and kernfs_path_from_node()
if the fs was created with KERNFS_ROOT_INVARIANT_PARENT. This is usefull
as it allows to implement kernfs_path_from_node() only with RCU
protection and avoiding kernfs_rename_lock. The lock is only required if
the __parent node can be changed and the function requires an unchanged
hierarchy while it iterates from the node to its parent.
The change is needed to allow the lookup of the node's path
(kernfs_path_from_node()) from context which runs always with disabled
preemption and or interrutps even on PREEMPT_RT. The problem is that
kernfs_rename_lock becomes a sleeping lock on PREEMPT_RT.

I went through all ::name users and added the required access for the lookup
with a few extensions:
- rdtgroup_pseudo_lock_create() drops all locks and then uses the name
  later on. resctrl supports rename with different parents. Here I made
  a temporal copy of the name while it is used outside of the lock.

- kernfs_rename_ns() accepts NULL as new_parent. This simplifies
  sysfs_move_dir_ns() where it can set NULL in order to reuse the current
  name.

- kernfs_rename_ns() is only using kernfs_rename_lock if the parents are
  different. All users use either kernfs_rwsem (for stable path view) or
  just RCU for the lookup. The ::name uses always RCU free.

Use RCU lifetime guarantees to access kernfs_node::name.

Intel-SIG: commit 741c10b096bc kernfs: Use RCU to access kernfs_node::name.
Backport Resctrl/RDT-SNC for Intel platforms

Suggested-by: Tejun Heo <tj@kernel.org>
Acked-by: Tejun Heo <tj@kernel.org>
Reported-by: syzbot+6ea37e2e6ffccf41a7e6@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/lkml/67251dc6.050a0220.529b6.015e.GAE@google.com/
Reported-by: Hillf Danton <hdanton@sina.com>
Closes: https://lore.kernel.org/20241102001224.2789-1-hdanton@sina.com
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20250213145023.2820193-7-bigeasy@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

 Conflicts:
	fs/kernfs/file.c
[jz: - resolve context conflict
     - add asm/sections.h header file inclusion because is_kernel_rodata()
       need this. Upstream doesn't need this inclusion because its
       linux/security.h indirectly included asm/sections.h]
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h    |   5 +
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c |  14 ++-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    |  10 +-
 fs/kernfs/dir.c                           | 115 ++++++++++++----------
 fs/kernfs/file.c                          |   4 +-
 fs/kernfs/kernfs-internal.h               |   5 +
 fs/kernfs/mount.c                         |   5 +-
 fs/kernfs/symlink.c                       |   7 +-
 fs/sysfs/dir.c                            |   2 +-
 include/linux/kernfs.h                    |   4 +-
 security/selinux/hooks.c                  |   7 +-
 11 files changed, 107 insertions(+), 71 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 4286d72e6010..dc63ac538a81 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -384,6 +384,11 @@ static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r
 
 extern struct mutex rdtgroup_mutex;
 
+static inline const char *rdt_kn_name(const struct kernfs_node *kn)
+{
+	return rcu_dereference_check(kn->name, lockdep_is_held(&rdtgroup_mutex));
+}
+
 extern struct rdt_hw_resource rdt_resources_all[];
 extern struct rdtgroup rdtgroup_default;
 extern struct dentry *debugfs_resctrl;
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 610c1df67ede..9df4a62d0011 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -53,7 +53,8 @@ static char *pseudo_lock_devnode(const struct device *dev, umode_t *mode)
 	rdtgrp = dev_get_drvdata(dev);
 	if (mode)
 		*mode = 0600;
-	return kasprintf(GFP_KERNEL, "pseudo_lock/%s", rdtgrp->kn->name);
+	guard(mutex)(&rdtgroup_mutex);
+	return kasprintf(GFP_KERNEL, "pseudo_lock/%s", rdt_kn_name(rdtgrp->kn));
 }
 
 static const struct class pseudo_lock_class = {
@@ -1299,6 +1300,7 @@ int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
 	struct task_struct *thread;
 	unsigned int new_minor;
 	struct device *dev;
+	char *kn_name __free(kfree) = NULL;
 	int ret;
 
 	ret = pseudo_lock_region_alloc(plr);
@@ -1310,6 +1312,11 @@ int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
 		ret = -EINVAL;
 		goto out_region;
 	}
+	kn_name = kstrdup(rdt_kn_name(rdtgrp->kn), GFP_KERNEL);
+	if (!kn_name) {
+		ret = -ENOMEM;
+		goto out_cstates;
+	}
 
 	plr->thread_done = 0;
 
@@ -1354,8 +1361,7 @@ int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
 	mutex_unlock(&rdtgroup_mutex);
 
 	if (!IS_ERR_OR_NULL(debugfs_resctrl)) {
-		plr->debugfs_dir = debugfs_create_dir(rdtgrp->kn->name,
-						      debugfs_resctrl);
+		plr->debugfs_dir = debugfs_create_dir(kn_name, debugfs_resctrl);
 		if (!IS_ERR_OR_NULL(plr->debugfs_dir))
 			debugfs_create_file("pseudo_lock_measure", 0200,
 					    plr->debugfs_dir, rdtgrp,
@@ -1364,7 +1370,7 @@ int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
 
 	dev = device_create(&pseudo_lock_class, NULL,
 			    MKDEV(pseudo_lock_major, new_minor),
-			    rdtgrp, "%s", rdtgrp->kn->name);
+			    rdtgrp, "%s", kn_name);
 
 	mutex_lock(&rdtgroup_mutex);
 
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 6cf27a5bc3d5..240573b5f002 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -964,14 +964,14 @@ int proc_resctrl_show(struct seq_file *s, struct pid_namespace *ns,
 			continue;
 
 		seq_printf(s, "res:%s%s\n", (rdtg == &rdtgroup_default) ? "/" : "",
-			   rdtg->kn->name);
+			   rdt_kn_name(rdtg->kn));
 		seq_puts(s, "mon:");
 		list_for_each_entry(crg, &rdtg->mon.crdtgrp_list,
 				    mon.crdtgrp_list) {
 			if (!resctrl_arch_match_rmid(tsk, crg->mon.parent->closid,
 						     crg->mon.rmid))
 				continue;
-			seq_printf(s, "%s", crg->kn->name);
+			seq_printf(s, "%s", rdt_kn_name(crg->kn));
 			break;
 		}
 		seq_putc(s, '\n');
@@ -3876,7 +3876,7 @@ static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn,
  */
 static bool is_mon_groups(struct kernfs_node *kn, const char *name)
 {
-	return (!strcmp(kn->name, "mon_groups") &&
+	return (!strcmp(rdt_kn_name(kn), "mon_groups") &&
 		strcmp(name, "mon_groups"));
 }
 
@@ -4033,7 +4033,7 @@ static int rdtgroup_rmdir(struct kernfs_node *kn)
 			ret = rdtgroup_rmdir_ctrl(rdtgrp, tmpmask);
 		}
 	} else if (rdtgrp->type == RDTMON_GROUP &&
-		 is_mon_groups(parent_kn, kn->name)) {
+		 is_mon_groups(parent_kn, rdt_kn_name(kn))) {
 		ret = rdtgroup_rmdir_mon(rdtgrp, tmpmask);
 	} else {
 		ret = -EPERM;
@@ -4121,7 +4121,7 @@ static int rdtgroup_rename(struct kernfs_node *kn,
 
 	kn_parent = rdt_kn_parent(kn);
 	if (rdtgrp->type != RDTMON_GROUP || !kn_parent ||
-	    !is_mon_groups(kn_parent, kn->name)) {
+	    !is_mon_groups(kn_parent, rdt_kn_name(kn))) {
 		rdt_last_cmd_puts("Source must be a MON group\n");
 		ret = -EPERM;
 		goto out;
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 92cdbdfd2cf0..3a0bf6adc245 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -15,6 +15,8 @@
 #include <linux/security.h>
 #include <linux/hash.h>
 
+#include <asm/sections.h>
+
 #include "kernfs-internal.h"
 
 DEFINE_RWLOCK(kernfs_rename_lock);	/* kn->parent and ->name */
@@ -51,14 +53,6 @@ static bool kernfs_lockdep(struct kernfs_node *kn)
 #endif
 }
 
-static int kernfs_name_locked(struct kernfs_node *kn, char *buf, size_t buflen)
-{
-	if (!kn)
-		return strscpy(buf, "(null)", buflen);
-
-	return strscpy(buf, rcu_access_pointer(kn->__parent) ? kn->name : "/", buflen);
-}
-
 /* kernfs_node_depth - compute depth from @from to @to */
 static size_t kernfs_depth(struct kernfs_node *from, struct kernfs_node *to)
 {
@@ -168,11 +162,13 @@ static int kernfs_path_from_node_locked(struct kernfs_node *kn_to,
 
 	/* Calculate how many bytes we need for the rest */
 	for (i = depth_to - 1; i >= 0; i--) {
+		const char *name;
 
 		for (kn = kn_to, j = 0; j < i; j++)
 			kn = rcu_dereference(kn->__parent);
 
-		len += scnprintf(buf + len, buflen - len, "/%s", kn->name);
+		name = rcu_dereference(kn->name);
+		len += scnprintf(buf + len, buflen - len, "/%s", name);
 	}
 
 	return len;
@@ -196,13 +192,18 @@ static int kernfs_path_from_node_locked(struct kernfs_node *kn_to,
  */
 int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen)
 {
-	unsigned long flags;
-	int ret;
+	struct kernfs_node *kn_parent;
 
-	read_lock_irqsave(&kernfs_rename_lock, flags);
-	ret = kernfs_name_locked(kn, buf, buflen);
-	read_unlock_irqrestore(&kernfs_rename_lock, flags);
-	return ret;
+	if (!kn)
+		return strscpy(buf, "(null)", buflen);
+
+	guard(rcu)();
+	/*
+	 * KERNFS_ROOT_INVARIANT_PARENT is ignored here. The name is RCU freed and
+	 * the parent is either existing or not.
+	 */
+	kn_parent = rcu_dereference(kn->__parent);
+	return strscpy(buf, kn_parent ? rcu_dereference(kn->name) : "/", buflen);
 }
 
 /**
@@ -224,14 +225,17 @@ int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen)
 int kernfs_path_from_node(struct kernfs_node *to, struct kernfs_node *from,
 			  char *buf, size_t buflen)
 {
-	unsigned long flags;
-	int ret;
+	struct kernfs_root *root;
 
 	guard(rcu)();
-	read_lock_irqsave(&kernfs_rename_lock, flags);
-	ret = kernfs_path_from_node_locked(to, from, buf, buflen);
-	read_unlock_irqrestore(&kernfs_rename_lock, flags);
-	return ret;
+	if (to) {
+		root = kernfs_root(to);
+		if (!(root->flags & KERNFS_ROOT_INVARIANT_PARENT)) {
+			guard(read_lock_irqsave)(&kernfs_rename_lock);
+			return kernfs_path_from_node_locked(to, from, buf, buflen);
+		}
+	}
+	return kernfs_path_from_node_locked(to, from, buf, buflen);
 }
 EXPORT_SYMBOL_GPL(kernfs_path_from_node);
 
@@ -338,13 +342,13 @@ static int kernfs_name_compare(unsigned int hash, const char *name,
 		return -1;
 	if (ns > kn->ns)
 		return 1;
-	return strcmp(name, kn->name);
+	return strcmp(name, kernfs_rcu_name(kn));
 }
 
 static int kernfs_sd_compare(const struct kernfs_node *left,
 			     const struct kernfs_node *right)
 {
-	return kernfs_name_compare(left->hash, left->name, left->ns, right);
+	return kernfs_name_compare(left->hash, kernfs_rcu_name(left), left->ns, right);
 }
 
 /**
@@ -542,7 +546,8 @@ static void kernfs_free_rcu(struct rcu_head *rcu)
 {
 	struct kernfs_node *kn = container_of(rcu, struct kernfs_node, rcu);
 
-	kfree_const(kn->name);
+	/* If the whole node goes away, then name can't be used outside */
+	kfree_const(rcu_access_pointer(kn->name));
 
 	if (kn->iattr) {
 		simple_xattrs_free(&kn->iattr->xattrs, NULL);
@@ -575,7 +580,8 @@ void kernfs_put(struct kernfs_node *kn)
 
 	WARN_ONCE(atomic_read(&kn->active) != KN_DEACTIVATED_BIAS,
 		  "kernfs_put: %s/%s: released with incorrect active_ref %d\n",
-		  parent ? parent->name : "", kn->name, atomic_read(&kn->active));
+		  parent ? rcu_dereference(parent->name) : "",
+		  rcu_dereference(kn->name), atomic_read(&kn->active));
 
 	if (kernfs_type(kn) == KERNFS_LINK)
 		kernfs_put(kn->symlink.target_kn);
@@ -652,7 +658,7 @@ static struct kernfs_node *__kernfs_new_node(struct kernfs_root *root,
 	atomic_set(&kn->active, KN_DEACTIVATED_BIAS);
 	RB_CLEAR_NODE(&kn->rb);
 
-	kn->name = name;
+	rcu_assign_pointer(kn->name, name);
 	kn->mode = mode;
 	kn->flags = flags;
 
@@ -790,7 +796,8 @@ int kernfs_add_one(struct kernfs_node *kn)
 	ret = -EINVAL;
 	has_ns = kernfs_ns_enabled(parent);
 	if (WARN(has_ns != (bool)kn->ns, KERN_WARNING "kernfs: ns %s in '%s' for '%s'\n",
-		 has_ns ? "required" : "invalid", parent->name, kn->name))
+		 has_ns ? "required" : "invalid",
+		 kernfs_rcu_name(parent), kernfs_rcu_name(kn)))
 		goto out_unlock;
 
 	if (kernfs_type(parent) != KERNFS_DIR)
@@ -800,7 +807,7 @@ int kernfs_add_one(struct kernfs_node *kn)
 	if (parent->flags & (KERNFS_REMOVING | KERNFS_EMPTY_DIR))
 		goto out_unlock;
 
-	kn->hash = kernfs_name_hash(kn->name, kn->ns);
+	kn->hash = kernfs_name_hash(kernfs_rcu_name(kn), kn->ns);
 
 	ret = kernfs_link_sibling(kn);
 	if (ret)
@@ -856,7 +863,7 @@ static struct kernfs_node *kernfs_find_ns(struct kernfs_node *parent,
 
 	if (has_ns != (bool)ns) {
 		WARN(1, KERN_WARNING "kernfs: ns %s in '%s' for '%s'\n",
-		     has_ns ? "required" : "invalid", parent->name, name);
+		     has_ns ? "required" : "invalid", kernfs_rcu_name(parent), name);
 		return NULL;
 	}
 
@@ -1134,8 +1141,6 @@ static int kernfs_dop_revalidate(struct dentry *dentry, unsigned int flags)
 
 	/* Negative hashed dentry? */
 	if (d_really_is_negative(dentry)) {
-		struct kernfs_node *parent;
-
 		/* If the kernfs parent node has changed discard and
 		 * proceed to ->lookup.
 		 *
@@ -1183,7 +1188,7 @@ static int kernfs_dop_revalidate(struct dentry *dentry, unsigned int flags)
 		goto out_bad;
 
 	/* The kernfs node has been renamed */
-	if (strcmp(dentry->d_name.name, kn->name) != 0)
+	if (strcmp(dentry->d_name.name, kernfs_rcu_name(kn)) != 0)
 		goto out_bad;
 
 	/* The kernfs node has been moved to a different namespace */
@@ -1477,7 +1482,7 @@ static void __kernfs_remove(struct kernfs_node *kn)
 	if (kernfs_parent(kn) && RB_EMPTY_NODE(&kn->rb))
 		return;
 
-	pr_debug("kernfs %s: removing\n", kn->name);
+	pr_debug("kernfs %s: removing\n", kernfs_rcu_name(kn));
 
 	/* prevent new usage by marking all nodes removing and deactivating */
 	pos = NULL;
@@ -1734,7 +1739,7 @@ int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent,
 {
 	struct kernfs_node *old_parent;
 	struct kernfs_root *root;
-	const char *old_name = NULL;
+	const char *old_name;
 	int error;
 
 	/* can't move or rename root */
@@ -1757,8 +1762,11 @@ int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent,
 	}
 
 	error = 0;
+	old_name = kernfs_rcu_name(kn);
+	if (!new_name)
+		new_name = old_name;
 	if ((old_parent == new_parent) && (kn->ns == new_ns) &&
-	    (strcmp(kn->name, new_name) == 0))
+	    (strcmp(old_name, new_name) == 0))
 		goto out;	/* nothing to rename */
 
 	error = -EEXIST;
@@ -1766,7 +1774,7 @@ int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent,
 		goto out;
 
 	/* rename kernfs_node */
-	if (strcmp(kn->name, new_name) != 0) {
+	if (strcmp(old_name, new_name) != 0) {
 		error = -ENOMEM;
 		new_name = kstrdup_const(new_name, GFP_KERNEL);
 		if (!new_name)
@@ -1779,27 +1787,32 @@ int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent,
 	 * Move to the appropriate place in the appropriate directories rbtree.
 	 */
 	kernfs_unlink_sibling(kn);
-	kernfs_get(new_parent);
 
-	/* rename_lock protects ->parent and ->name accessors */
-	write_lock_irq(&kernfs_rename_lock);
+	/* rename_lock protects ->parent accessors */
+	if (old_parent != new_parent) {
+		kernfs_get(new_parent);
+		write_lock_irq(&kernfs_rename_lock);
 
-	old_parent = kernfs_parent(kn);
-	rcu_assign_pointer(kn->__parent, new_parent);
+		rcu_assign_pointer(kn->__parent, new_parent);
 
-	kn->ns = new_ns;
-	if (new_name) {
-		old_name = kn->name;
-		kn->name = new_name;
-	}
+		kn->ns = new_ns;
+		if (new_name)
+			rcu_assign_pointer(kn->name, new_name);
 
-	write_unlock_irq(&kernfs_rename_lock);
+		write_unlock_irq(&kernfs_rename_lock);
+		kernfs_put(old_parent);
+	} else {
+		/* name assignment is RCU protected, parent is the same */
+		kn->ns = new_ns;
+		if (new_name)
+			rcu_assign_pointer(kn->name, new_name);
+	}
 
-	kn->hash = kernfs_name_hash(kn->name, kn->ns);
+	kn->hash = kernfs_name_hash(new_name ?: old_name, kn->ns);
 	kernfs_link_sibling(kn);
 
-	kernfs_put(old_parent);
-	kfree_const(old_name);
+	if (new_name && !is_kernel_rodata((unsigned long)old_name))
+		kfree_rcu_mightsleep(old_name);
 
 	error = 0;
  out:
@@ -1884,7 +1897,7 @@ static int kernfs_fop_readdir(struct file *file, struct dir_context *ctx)
 	for (pos = kernfs_dir_pos(ns, parent, ctx->pos, pos);
 	     pos;
 	     pos = kernfs_dir_next_pos(ns, parent, ctx->pos, pos)) {
-		const char *name = pos->name;
+		const char *name = kernfs_rcu_name(pos);
 		unsigned int type = fs_umode_to_dtype(pos->mode);
 		int len = strlen(name);
 		ino_t ino = kernfs_ino(pos);
diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index 09c482eeb2b7..92b3c8f8b77e 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -909,6 +909,7 @@ static void kernfs_notify_workfn(struct work_struct *work)
 	list_for_each_entry(info, &kernfs_root(kn)->supers, node) {
 		struct kernfs_node *parent;
 		struct inode *p_inode = NULL;
+		const char *kn_name;
 		struct inode *inode;
 		struct qstr name;
 
@@ -922,7 +923,8 @@ static void kernfs_notify_workfn(struct work_struct *work)
 		if (!inode)
 			continue;
 
-		name = (struct qstr)QSTR_INIT(kn->name, strlen(kn->name));
+		kn_name = kernfs_rcu_name(kn);
+		name = (struct qstr)QSTR_INIT(kn_name, strlen(kn_name));
 		parent = kernfs_get_parent(kn);
 		if (parent) {
 			p_inode = ilookup(info->sb, kernfs_ino(parent));
diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h
index dbcf24c30a3d..3de6346e41e5 100644
--- a/fs/kernfs/kernfs-internal.h
+++ b/fs/kernfs/kernfs-internal.h
@@ -107,6 +107,11 @@ static inline bool kernfs_root_is_locked(const struct kernfs_node *kn)
 	return lockdep_is_held(&kernfs_root(kn)->kernfs_rwsem);
 }
 
+static inline const char *kernfs_rcu_name(const struct kernfs_node *kn)
+{
+	return rcu_dereference_check(kn->name, kernfs_root_is_locked(kn));
+}
+
 static inline struct kernfs_node *kernfs_parent(const struct kernfs_node *kn)
 {
 	/*
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index 32934cae08cb..eb8e763eb76f 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -233,6 +233,7 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn,
 	do {
 		struct dentry *dtmp;
 		struct kernfs_node *kntmp;
+		const char *name;
 
 		if (kn == knparent)
 			return dentry;
@@ -241,8 +242,8 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn,
 			dput(dentry);
 			return ERR_PTR(-EINVAL);
 		}
-		dtmp = lookup_positive_unlocked(kntmp->name, dentry,
-					       strlen(kntmp->name));
+		name = rcu_dereference(kntmp->name);
+		dtmp = lookup_positive_unlocked(name, dentry, strlen(name));
 		dput(dentry);
 		if (IS_ERR(dtmp))
 			return dtmp;
diff --git a/fs/kernfs/symlink.c b/fs/kernfs/symlink.c
index 05c62ca93c53..0bd8a2143723 100644
--- a/fs/kernfs/symlink.c
+++ b/fs/kernfs/symlink.c
@@ -81,7 +81,7 @@ static int kernfs_get_target_path(struct kernfs_node *parent,
 	/* determine end of target string for reverse fillup */
 	kn = target;
 	while (kernfs_parent(kn) && kn != base) {
-		len += strlen(kn->name) + 1;
+		len += strlen(kernfs_rcu_name(kn)) + 1;
 		kn = kernfs_parent(kn);
 	}
 
@@ -95,10 +95,11 @@ static int kernfs_get_target_path(struct kernfs_node *parent,
 	/* reverse fillup of target string from target to base */
 	kn = target;
 	while (kernfs_parent(kn) && kn != base) {
-		int slen = strlen(kn->name);
+		const char *name = kernfs_rcu_name(kn);
+		int slen = strlen(name);
 
 		len -= slen;
-		memcpy(s + len, kn->name, slen);
+		memcpy(s + len, name, slen);
 		if (len)
 			s[--len] = '/';
 
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index b6b6796e1616..2e7b9cb2788e 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -123,7 +123,7 @@ int sysfs_move_dir_ns(struct kobject *kobj, struct kobject *new_parent_kobj,
 	new_parent = new_parent_kobj && new_parent_kobj->sd ?
 		new_parent_kobj->sd : sysfs_root_kn;
 
-	return kernfs_rename_ns(kn, new_parent, kn->name, new_ns);
+	return kernfs_rename_ns(kn, new_parent, NULL, new_ns);
 }
 
 /**
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index 7e296d6f85a5..ec690895ee2b 100644
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -207,8 +207,8 @@ struct kernfs_node {
 	 * never moved to a different parent, it is safe to access the
 	 * parent directly.
 	 */
-	const char		*name;
 	struct kernfs_node	__rcu *__parent;
+	const char		__rcu *name;
 
 	struct rb_node		rb;
 
@@ -411,7 +411,7 @@ static inline bool kernfs_ns_enabled(struct kernfs_node *kn)
 }
 
 int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen);
-int kernfs_path_from_node(struct kernfs_node *root_kn, struct kernfs_node *kn,
+int kernfs_path_from_node(struct kernfs_node *kn_to, struct kernfs_node *kn_from,
 			  char *buf, size_t buflen);
 void pr_cont_kernfs_name(struct kernfs_node *kn);
 void pr_cont_kernfs_path(struct kernfs_node *kn);
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index d4a99d98ec77..8a8e4d51f298 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3567,10 +3567,13 @@ static int selinux_kernfs_init_security(struct kernfs_node *kn_dir,
 		newsid = tsec->create_sid;
 	} else {
 		u16 secclass = inode_mode_to_security_class(kn->mode);
+		const char *kn_name;
 		struct qstr q;
 
-		q.name = kn->name;
-		q.hash_len = hashlen_string(kn_dir, kn->name);
+		/* kn is fresh, can't be renamed, name goes not away */
+		kn_name = rcu_dereference_check(kn->name, true);
+		q.name = kn_name;
+		q.hash_len = hashlen_string(kn_dir, kn_name);
 
 		rc = security_transition_sid(tsec->sid,
 					     parent_sid, secclass, &q,
-- 
Gitee


From a9e5f3e2de4ab0d526d22b089560567d65c1c87f Mon Sep 17 00:00:00 2001
From: Amir Goldstein <amir73il@gmail.com>
Date: Fri, 5 Apr 2024 17:56:35 +0300
Subject: [PATCH 268/280] kernfs: annotate different lockdep class for
 of->mutex of writable files

ANBZ: #31045

commit 16b52bbee4823b01ab7fe3919373c981a38f3797 upstream.

The writable file /sys/power/resume may call vfs lookup helpers for
arbitrary paths and readonly files can be read by overlayfs from vfs
helpers when sysfs is a lower layer of overalyfs.

To avoid a lockdep warning of circular dependency between overlayfs
inode lock and kernfs of->mutex, use a different lockdep class for
writable and readonly kernfs files.

Intel-SIG: commit 16b52bbee482 kernfs: annotate different lockdep class for of->mutex of writable files
Backport Resctrl/RDT-SNC for Intel platforms

Reported-by: syzbot+9a5b0ced8b1bfb238b56@syzkaller.appspotmail.com
Fixes: 0fedefd4c4e3 ("kernfs: sysfs: support custom llseek method for sysfs entries")
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/kernfs/file.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index 92b3c8f8b77e..29e6a9315398 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -636,11 +636,18 @@ static int kernfs_fop_open(struct inode *inode, struct file *file)
 	 * each file a separate locking class.  Let's differentiate on
 	 * whether the file has mmap or not for now.
 	 *
-	 * Both paths of the branch look the same.  They're supposed to
+	 * For similar reasons, writable and readonly files are given different
+	 * lockdep key, because the writable file /sys/power/resume may call vfs
+	 * lookup helpers for arbitrary paths and readonly files can be read by
+	 * overlayfs from vfs helpers when sysfs is a lower layer of overalyfs.
+	 *
+	 * All three cases look the same.  They're supposed to
 	 * look that way and give @of->mutex different static lockdep keys.
 	 */
 	if (has_mmap)
 		mutex_init(&of->mutex);
+	else if (file->f_mode & FMODE_WRITE)
+		mutex_init(&of->mutex);
 	else
 		mutex_init(&of->mutex);
 
-- 
Gitee


From 00f23408f3c231881dd4f8addc11a6819dde0bd5 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue, 18 Feb 2025 17:39:38 +0100
Subject: [PATCH 269/280] kernfs: Drop kernfs_rwsem while invoking
 lookup_positive_unlocked().

ANBZ: #31045

commit 6ef5b6fae304091593956be59065c0c8633ad9e8 upstream.

syzbot reported two warnings:
- kernfs_node::name was accessed outside of a RCU section so it created
  warning. The kernfs_rwsem was held so it was okay but it wasn't seen.

- While kernfs_rwsem was held invoked lookup_positive_unlocked()->
  kernfs_dop_revalidate() which acquired kernfs_rwsem.

kernfs_rwsem was both acquired as a read lock so it can be acquired
twice. However if a writer acquires the lock after the first reader then
neither the writer nor the second reader can obtain the lock so it
deadlocks.

The reason for the lock is to ensure that kernfs_node::name remain
stable during lookup_positive_unlocked()'s invocation. The function can
not be invoked within a RCU section because it may sleep.

Make a temporary copy of the kernfs_node::name under the lock so
GFP_KERNEL can be used and use this instead.

Intel-SIG: commit 6ef5b6fae304 kernfs: Drop kernfs_rwsem while invoking lookup_positive_unlocked().
Backport Resctrl/RDT-SNC for Intel Platform

Reported-by: syzbot+ecccecbc636b455f9084@syzkaller.appspotmail.com
Fixes: 5b2fabf7fe8f ("kernfs: Acquire kernfs_rwsem in kernfs_node_dentry().")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20250218163938.xmvjlJ0K@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/kernfs/mount.c | 33 ++++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index eb8e763eb76f..58a915ced973 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -222,12 +222,19 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn,
 		return dentry;
 
 	root = kernfs_root(kn);
-	guard(rwsem_read)(&root->kernfs_rwsem);
-
-	knparent = find_next_ancestor(kn, NULL);
-	if (WARN_ON(!knparent)) {
-		dput(dentry);
+	/*
+	 * As long as kn is valid, its parent can not vanish. This is cgroup's
+	 * kn so it not have its parent replaced. Therefore it is safe to use
+	 * the ancestor node outside of the RCU or locked section.
+	 */
+	if (WARN_ON_ONCE(!(root->flags & KERNFS_ROOT_INVARIANT_PARENT)))
 		return ERR_PTR(-EINVAL);
+	scoped_guard(rcu) {
+		knparent = find_next_ancestor(kn, NULL);
+		if (WARN_ON(!knparent)) {
+			dput(dentry);
+			return ERR_PTR(-EINVAL);
+		}
 	}
 
 	do {
@@ -237,14 +244,22 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn,
 
 		if (kn == knparent)
 			return dentry;
-		kntmp = find_next_ancestor(kn, knparent);
-		if (WARN_ON(!kntmp)) {
+
+		scoped_guard(rwsem_read, &root->kernfs_rwsem) {
+			kntmp = find_next_ancestor(kn, knparent);
+			if (WARN_ON(!kntmp)) {
+				dput(dentry);
+				return ERR_PTR(-EINVAL);
+			}
+			name = kstrdup(kernfs_rcu_name(kntmp), GFP_KERNEL);
+		}
+		if (!name) {
 			dput(dentry);
-			return ERR_PTR(-EINVAL);
+			return ERR_PTR(-ENOMEM);
 		}
-		name = rcu_dereference(kntmp->name);
 		dtmp = lookup_positive_unlocked(name, dentry, strlen(name));
 		dput(dentry);
+		kfree(name);
 		if (IS_ERR(dtmp))
 			return dtmp;
 		knparent = kntmp;
-- 
Gitee


From 206d1f3e1a3ffb2bfa2e0ea04595793d5ec92534 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 21 Feb 2025 09:42:32 +0100
Subject: [PATCH 270/280] kernfs: Move dput() outside of the RCU section.

ANBZ: #31045

commit c5020c5be9d266f66fa5ba3286f0e8d2d2265970 upstream.

Al Viro pointed out that dput() might sleep and must not be invoked
within an RCU section.

Keep only find_next_ancestor() winthin the RCU section.
Correct the wording in the comment.

Intel-SIG: commit c5020c5be9d2 kernfs: Move dput() outside of the RCU section.
Backport Resctrl/RDT-SNC for Intel Platform

Fixes: 6ef5b6fae3040 ("kernfs: Drop kernfs_rwsem while invoking lookup_positive_unlocked().")
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20250221084232.xksA_IQ4@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/kernfs/mount.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index 58a915ced973..811a1632d97a 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -224,17 +224,17 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn,
 	root = kernfs_root(kn);
 	/*
 	 * As long as kn is valid, its parent can not vanish. This is cgroup's
-	 * kn so it not have its parent replaced. Therefore it is safe to use
+	 * kn so it can't have its parent replaced. Therefore it is safe to use
 	 * the ancestor node outside of the RCU or locked section.
 	 */
 	if (WARN_ON_ONCE(!(root->flags & KERNFS_ROOT_INVARIANT_PARENT)))
 		return ERR_PTR(-EINVAL);
 	scoped_guard(rcu) {
 		knparent = find_next_ancestor(kn, NULL);
-		if (WARN_ON(!knparent)) {
-			dput(dentry);
-			return ERR_PTR(-EINVAL);
-		}
+	}
+	if (WARN_ON(!knparent)) {
+		dput(dentry);
+		return ERR_PTR(-EINVAL);
 	}
 
 	do {
-- 
Gitee


From 1da929340611e4ee93f1a517ef1fc094d412161d Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Mon, 7 Apr 2025 13:46:37 +0100
Subject: [PATCH 271/280] x86/resctrl: Fix rdtgroup_mkdir()'s unlocked use of
 kernfs_node::name

ANBZ: #31045

commit 45c2e30bbd64d75559b99f3a5c455129a7a34b06 upstream.

Since

  741c10b096bc ("kernfs: Use RCU to access kernfs_node::name.")

a helper rdt_kn_name() that checks that rdtgroup_mutex is held has been used
for all accesses to the kernfs node name.

rdtgroup_mkdir() uses the name to determine if a valid monitor group is being
created by checking the parent name is "mon_groups". This is done without
holding rdtgroup_mutex, and now triggers the following warning:

  | WARNING: suspicious RCU usage
  | 6.15.0-rc1 #4465 Tainted: G            E
  | -----------------------------
  | arch/x86/kernel/cpu/resctrl/internal.h:408 suspicious rcu_dereference_check() usage!
  [...]
  | Call Trace:
  |  <TASK>
  |  dump_stack_lvl
  |  lockdep_rcu_suspicious.cold
  |  is_mon_groups
  |  rdtgroup_mkdir
  |  kernfs_iop_mkdir
  |  vfs_mkdir
  |  do_mkdirat
  |  __x64_sys_mkdir
  |  do_syscall_64
  |  entry_SYSCALL_64_after_hwframe

Creating a control or monitor group calls mkdir_rdt_prepare(), which uses
rdtgroup_kn_lock_live() to take the rdtgroup_mutex.

To avoid taking and dropping the lock, move the check for the monitor group
name and position into mkdir_rdt_prepare() so that it occurs under
rdtgroup_mutex. Hoist is_mon_groups() earlier in the file.

  [ bp: Massage. ]

Intel-SIG: commit 45c2e30bbd64 x86/resctrl: Fix rdtgroup_mkdir()'s unlocked use of kernfs_node::name
Backport Resctrl/RDT-SNC for Intel platforms

Fixes: 741c10b096bc ("kernfs: Use RCU to access kernfs_node::name.")
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20250407124637.2433230-1-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 48 +++++++++++++++-----------
 1 file changed, 27 insertions(+), 21 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 240573b5f002..ace86b6dcede 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -3666,6 +3666,22 @@ static void mkdir_rdt_prepare_rmid_free(struct rdtgroup *rgrp)
 		free_rmid(rgrp->closid, rgrp->mon.rmid);
 }
 
+/*
+ * We allow creating mon groups only with in a directory called "mon_groups"
+ * which is present in every ctrl_mon group. Check if this is a valid
+ * "mon_groups" directory.
+ *
+ * 1. The directory should be named "mon_groups".
+ * 2. The mon group itself should "not" be named "mon_groups".
+ *   This makes sure "mon_groups" directory always has a ctrl_mon group
+ *   as parent.
+ */
+static bool is_mon_groups(struct kernfs_node *kn, const char *name)
+{
+	return (!strcmp(rdt_kn_name(kn), "mon_groups") &&
+		strcmp(name, "mon_groups"));
+}
+
 static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
 			     const char *name, umode_t mode,
 			     enum rdt_group_type rtype, struct rdtgroup **r)
@@ -3681,6 +3697,15 @@ static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
 		goto out_unlock;
 	}
 
+	/*
+	 * Check that the parent directory for a monitor group is a "mon_groups"
+	 * directory.
+	 */
+	if (rtype == RDTMON_GROUP && !is_mon_groups(parent_kn, name)) {
+		ret = -EPERM;
+		goto out_unlock;
+	}
+
 	if (rtype == RDTMON_GROUP &&
 	    (prdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
 	     prdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)) {
@@ -3864,22 +3889,6 @@ static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn,
 	return ret;
 }
 
-/*
- * We allow creating mon groups only with in a directory called "mon_groups"
- * which is present in every ctrl_mon group. Check if this is a valid
- * "mon_groups" directory.
- *
- * 1. The directory should be named "mon_groups".
- * 2. The mon group itself should "not" be named "mon_groups".
- *   This makes sure "mon_groups" directory always has a ctrl_mon group
- *   as parent.
- */
-static bool is_mon_groups(struct kernfs_node *kn, const char *name)
-{
-	return (!strcmp(rdt_kn_name(kn), "mon_groups") &&
-		strcmp(name, "mon_groups"));
-}
-
 static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
 			  umode_t mode)
 {
@@ -3895,11 +3904,8 @@ static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
 	if (resctrl_arch_alloc_capable() && parent_kn == rdtgroup_default.kn)
 		return rdtgroup_mkdir_ctrl_mon(parent_kn, name, mode);
 
-	/*
-	 * If RDT monitoring is supported and the parent directory is a valid
-	 * "mon_groups" directory, add a monitoring subdirectory.
-	 */
-	if (resctrl_arch_mon_capable() && is_mon_groups(parent_kn, name))
+	/* Else, attempt to add a monitoring subdirectory. */
+	if (resctrl_arch_mon_capable())
 		return rdtgroup_mkdir_mon(parent_kn, name, mode);
 
 	return -EPERM;
-- 
Gitee


From 305ac8badebe2f398e74fe1ca2e2e60359ce7475 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:54 +0000
Subject: [PATCH 272/280] x86,fs/resctrl: Move the resctrl filesystem code to
 live in /fs/resctrl

ANBZ: #31045

commit 7168ae330e8105296210b2b2d31d791d5c073345 upstream.

Resctrl is a filesystem interface to hardware that provides cache
allocation policy and bandwidth control for groups of tasks or CPUs.

To support more than one architecture, resctrl needs to live in /fs/.

Move the code that is concerned with the filesystem interface to
/fs/resctrl.

Intel-SIG: commit 7168ae330e81 x86,fs/resctrl: Move the resctrl filesystem code to live in /fs/resctrl
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-25-james.morse@arm.com

 Conflicts:
	arch/x86/kernel/cpu/resctrl/pseudo_lock.c
	arch/x86/kernel/cpu/resctrl/rdtgroup.c
[jz: - resolve conflicts
     - keep .llseek in pseudo_lock_dev_fops, since cb787f4ac0c2
       ("[tree-wide] finally take no_llseek out") not backported]
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 Documentation/arch/x86/index.rst              |    1 -
 Documentation/filesystems/index.rst           |    1 +
 .../{arch/x86 => filesystems}/resctrl.rst     |    0
 MAINTAINERS                                   |    2 +-
 arch/x86/kernel/cpu/resctrl/Makefile          |    1 -
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c     |  641 ---
 arch/x86/kernel/cpu/resctrl/internal.h        |  371 +-
 arch/x86/kernel/cpu/resctrl/monitor.c         |  909 +---
 arch/x86/kernel/cpu/resctrl/monitor_trace.h   |   31 -
 arch/x86/kernel/cpu/resctrl/pseudo_lock.c     | 1088 +---
 .../kernel/cpu/resctrl/pseudo_lock_trace.h    |    2 +
 arch/x86/kernel/cpu/resctrl/rdtgroup.c        | 4597 +----------------
 fs/resctrl/Kconfig                            |    2 +-
 fs/resctrl/ctrlmondata.c                      |  661 +++
 fs/resctrl/internal.h                         |  426 ++
 fs/resctrl/monitor.c                          |  929 ++++
 fs/resctrl/monitor_trace.h                    |   33 +
 fs/resctrl/pseudo_lock.c                      | 1106 ++++
 fs/resctrl/pseudo_lock_trace.h                |    0
 fs/resctrl/rdtgroup.c                         | 4353 ++++++++++++++++
 20 files changed, 7664 insertions(+), 7490 deletions(-)
 rename Documentation/{arch/x86 => filesystems}/resctrl.rst (100%)
 delete mode 100644 arch/x86/kernel/cpu/resctrl/monitor_trace.h
 delete mode 100644 fs/resctrl/pseudo_lock_trace.h

diff --git a/Documentation/arch/x86/index.rst b/Documentation/arch/x86/index.rst
index 8ac64d7de4dc..00f9a99689fb 100644
--- a/Documentation/arch/x86/index.rst
+++ b/Documentation/arch/x86/index.rst
@@ -31,7 +31,6 @@ x86-specific Documentation
    pti
    mds
    microcode
-   resctrl
    tsx_async_abort
    buslock
    usb-legacy-support
diff --git a/Documentation/filesystems/index.rst b/Documentation/filesystems/index.rst
index 09cade7eaefc..f9e388fd8d00 100644
--- a/Documentation/filesystems/index.rst
+++ b/Documentation/filesystems/index.rst
@@ -109,6 +109,7 @@ Documentation for filesystem implementations.
    qnx6
    ramfs-rootfs-initramfs
    relay
+   resctrl
    romfs
    smb/index
    spufs/index
diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/filesystems/resctrl.rst
similarity index 100%
rename from Documentation/arch/x86/resctrl.rst
rename to Documentation/filesystems/resctrl.rst
diff --git a/MAINTAINERS b/MAINTAINERS
index 2def3d5f43b3..e0622acf338d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18201,7 +18201,7 @@ M:	Fenghua Yu <fenghua.yu@intel.com>
 M:	Reinette Chatre <reinette.chatre@intel.com>
 L:	linux-kernel@vger.kernel.org
 S:	Supported
-F:	Documentation/arch/x86/resctrl*
+F:	Documentation/filesystems/resctrl.rst
 F:	arch/x86/include/asm/resctrl.h
 F:	arch/x86/kernel/cpu/resctrl/
 F:	fs/resctrl/
diff --git a/arch/x86/kernel/cpu/resctrl/Makefile b/arch/x86/kernel/cpu/resctrl/Makefile
index 909be78ec6da..d8a04b195da2 100644
--- a/arch/x86/kernel/cpu/resctrl/Makefile
+++ b/arch/x86/kernel/cpu/resctrl/Makefile
@@ -5,4 +5,3 @@ obj-$(CONFIG_RESCTRL_FS_PSEUDO_LOCK)	+= pseudo_lock.o
 
 # To allow define_trace.h's recursive include:
 CFLAGS_pseudo_lock.o = -I$(src)
-CFLAGS_monitor.o = -I$(src)
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 110b534d400c..1189c0df4ad7 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -16,277 +16,9 @@
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
 
 #include <linux/cpu.h>
-#include <linux/kernfs.h>
-#include <linux/seq_file.h>
-#include <linux/slab.h>
-#include <linux/tick.h>
 
 #include "internal.h"
 
-struct rdt_parse_data {
-	struct rdtgroup		*rdtgrp;
-	char			*buf;
-};
-
-typedef int (ctrlval_parser_t)(struct rdt_parse_data *data,
-			       struct resctrl_schema *s,
-			       struct rdt_ctrl_domain *d);
-
-/*
- * Check whether MBA bandwidth percentage value is correct. The value is
- * checked against the minimum and max bandwidth values specified by the
- * hardware. The allocated bandwidth percentage is rounded to the next
- * control step available on the hardware.
- */
-static bool bw_validate(char *buf, u32 *data, struct rdt_resource *r)
-{
-	int ret;
-	u32 bw;
-
-	/*
-	 * Only linear delay values is supported for current Intel SKUs.
-	 */
-	if (!r->membw.delay_linear && r->membw.arch_needs_linear) {
-		rdt_last_cmd_puts("No support for non-linear MB domains\n");
-		return false;
-	}
-
-	ret = kstrtou32(buf, 10, &bw);
-	if (ret) {
-		rdt_last_cmd_printf("Invalid MB value %s\n", buf);
-		return false;
-	}
-
-	/* Nothing else to do if software controller is enabled. */
-	if (is_mba_sc(r)) {
-		*data = bw;
-		return true;
-	}
-
-	if (bw < r->membw.min_bw || bw > r->membw.max_bw) {
-		rdt_last_cmd_printf("MB value %u out of range [%d,%d]\n",
-				    bw, r->membw.min_bw, r->membw.max_bw);
-		return false;
-	}
-
-	*data = roundup(bw, (unsigned long)r->membw.bw_gran);
-	return true;
-}
-
-static int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
-		    struct rdt_ctrl_domain *d)
-{
-	struct resctrl_staged_config *cfg;
-	u32 closid = data->rdtgrp->closid;
-	struct rdt_resource *r = s->res;
-	u32 bw_val;
-
-	cfg = &d->staged_config[s->conf_type];
-	if (cfg->have_new_ctrl) {
-		rdt_last_cmd_printf("Duplicate domain %d\n", d->hdr.id);
-		return -EINVAL;
-	}
-
-	if (!bw_validate(data->buf, &bw_val, r))
-		return -EINVAL;
-
-	if (is_mba_sc(r)) {
-		d->mbps_val[closid] = bw_val;
-		return 0;
-	}
-
-	cfg->new_ctrl = bw_val;
-	cfg->have_new_ctrl = true;
-
-	return 0;
-}
-
-/*
- * Check whether a cache bit mask is valid.
- * On Intel CPUs, non-contiguous 1s value support is indicated by CPUID:
- *   - CPUID.0x10.1:ECX[3]: L3 non-contiguous 1s value supported if 1
- *   - CPUID.0x10.2:ECX[3]: L2 non-contiguous 1s value supported if 1
- *
- * Haswell does not support a non-contiguous 1s value and additionally
- * requires at least two bits set.
- * AMD allows non-contiguous bitmasks.
- */
-static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
-{
-	u32 supported_bits = BIT_MASK(r->cache.cbm_len) - 1;
-	unsigned int cbm_len = r->cache.cbm_len;
-	unsigned long first_bit, zero_bit, val;
-	int ret;
-
-	ret = kstrtoul(buf, 16, &val);
-	if (ret) {
-		rdt_last_cmd_printf("Non-hex character in the mask %s\n", buf);
-		return false;
-	}
-
-	if ((r->cache.min_cbm_bits > 0 && val == 0) || val > supported_bits) {
-		rdt_last_cmd_puts("Mask out of range\n");
-		return false;
-	}
-
-	first_bit = find_first_bit(&val, cbm_len);
-	zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
-
-	/* Are non-contiguous bitmasks allowed? */
-	if (!r->cache.arch_has_sparse_bitmasks &&
-	    (find_next_bit(&val, cbm_len, zero_bit) < cbm_len)) {
-		rdt_last_cmd_printf("The mask %lx has non-consecutive 1-bits\n", val);
-		return false;
-	}
-
-	if ((zero_bit - first_bit) < r->cache.min_cbm_bits) {
-		rdt_last_cmd_printf("Need at least %d bits in the mask\n",
-				    r->cache.min_cbm_bits);
-		return false;
-	}
-
-	*data = val;
-	return true;
-}
-
-/*
- * Read one cache bit mask (hex). Check that it is valid for the current
- * resource type.
- */
-static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
-		     struct rdt_ctrl_domain *d)
-{
-	struct rdtgroup *rdtgrp = data->rdtgrp;
-	struct resctrl_staged_config *cfg;
-	struct rdt_resource *r = s->res;
-	u32 cbm_val;
-
-	cfg = &d->staged_config[s->conf_type];
-	if (cfg->have_new_ctrl) {
-		rdt_last_cmd_printf("Duplicate domain %d\n", d->hdr.id);
-		return -EINVAL;
-	}
-
-	/*
-	 * Cannot set up more than one pseudo-locked region in a cache
-	 * hierarchy.
-	 */
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
-	    rdtgroup_pseudo_locked_in_hierarchy(d)) {
-		rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
-		return -EINVAL;
-	}
-
-	if (!cbm_validate(data->buf, &cbm_val, r))
-		return -EINVAL;
-
-	if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
-	     rdtgrp->mode == RDT_MODE_SHAREABLE) &&
-	    rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
-		rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
-		return -EINVAL;
-	}
-
-	/*
-	 * The CBM may not overlap with the CBM of another closid if
-	 * either is exclusive.
-	 */
-	if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, true)) {
-		rdt_last_cmd_puts("Overlaps with exclusive group\n");
-		return -EINVAL;
-	}
-
-	if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, false)) {
-		if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
-		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-			rdt_last_cmd_puts("Overlaps with other group\n");
-			return -EINVAL;
-		}
-	}
-
-	cfg->new_ctrl = cbm_val;
-	cfg->have_new_ctrl = true;
-
-	return 0;
-}
-
-/*
- * For each domain in this resource we expect to find a series of:
- *	id=mask
- * separated by ";". The "id" is in decimal, and must match one of
- * the "id"s for this resource.
- */
-static int parse_line(char *line, struct resctrl_schema *s,
-		      struct rdtgroup *rdtgrp)
-{
-	enum resctrl_conf_type t = s->conf_type;
-	ctrlval_parser_t *parse_ctrlval = NULL;
-	struct resctrl_staged_config *cfg;
-	struct rdt_resource *r = s->res;
-	struct rdt_parse_data data;
-	struct rdt_ctrl_domain *d;
-	char *dom = NULL, *id;
-	unsigned long dom_id;
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	switch (r->schema_fmt) {
-	case RESCTRL_SCHEMA_BITMAP:
-		parse_ctrlval = &parse_cbm;
-		break;
-	case RESCTRL_SCHEMA_RANGE:
-		parse_ctrlval = &parse_bw;
-		break;
-	}
-
-	if (WARN_ON_ONCE(!parse_ctrlval))
-		return -EINVAL;
-
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
-	    (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)) {
-		rdt_last_cmd_puts("Cannot pseudo-lock MBA resource\n");
-		return -EINVAL;
-	}
-
-next:
-	if (!line || line[0] == '\0')
-		return 0;
-	dom = strsep(&line, ";");
-	id = strsep(&dom, "=");
-	if (!dom || kstrtoul(id, 10, &dom_id)) {
-		rdt_last_cmd_puts("Missing '=' or non-numeric domain\n");
-		return -EINVAL;
-	}
-	dom = strim(dom);
-	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
-		if (d->hdr.id == dom_id) {
-			data.buf = dom;
-			data.rdtgrp = rdtgrp;
-			if (parse_ctrlval(&data, s, d))
-				return -EINVAL;
-			if (rdtgrp->mode ==  RDT_MODE_PSEUDO_LOCKSETUP) {
-				cfg = &d->staged_config[t];
-				/*
-				 * In pseudo-locking setup mode and just
-				 * parsed a valid CBM that should be
-				 * pseudo-locked. Only one locked region per
-				 * resource group and domain so just do
-				 * the required initialization for single
-				 * region and return.
-				 */
-				rdtgrp->plr->s = s;
-				rdtgrp->plr->d = d;
-				rdtgrp->plr->cbm = cfg->new_ctrl;
-				d->plr = rdtgrp->plr;
-				return 0;
-			}
-			goto next;
-		}
-	}
-	return -EINVAL;
-}
-
 int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_ctrl_domain *d,
 			    u32 closid, enum resctrl_conf_type t, u32 cfg_val)
 {
@@ -351,100 +83,6 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
 	return 0;
 }
 
-static int rdtgroup_parse_resource(char *resname, char *tok,
-				   struct rdtgroup *rdtgrp)
-{
-	struct resctrl_schema *s;
-
-	list_for_each_entry(s, &resctrl_schema_all, list) {
-		if (!strcmp(resname, s->name) && rdtgrp->closid < s->num_closid)
-			return parse_line(tok, s, rdtgrp);
-	}
-	rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
-	return -EINVAL;
-}
-
-ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
-				char *buf, size_t nbytes, loff_t off)
-{
-	struct resctrl_schema *s;
-	struct rdtgroup *rdtgrp;
-	struct rdt_resource *r;
-	char *tok, *resname;
-	int ret = 0;
-
-	/* Valid input requires a trailing newline */
-	if (nbytes == 0 || buf[nbytes - 1] != '\n')
-		return -EINVAL;
-	buf[nbytes - 1] = '\0';
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (!rdtgrp) {
-		rdtgroup_kn_unlock(of->kn);
-		return -ENOENT;
-	}
-	rdt_last_cmd_clear();
-
-	/*
-	 * No changes to pseudo-locked region allowed. It has to be removed
-	 * and re-created instead.
-	 */
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
-		ret = -EINVAL;
-		rdt_last_cmd_puts("Resource group is pseudo-locked\n");
-		goto out;
-	}
-
-	rdt_staged_configs_clear();
-
-	while ((tok = strsep(&buf, "\n")) != NULL) {
-		resname = strim(strsep(&tok, ":"));
-		if (!tok) {
-			rdt_last_cmd_puts("Missing ':'\n");
-			ret = -EINVAL;
-			goto out;
-		}
-		if (tok[0] == '\0') {
-			rdt_last_cmd_printf("Missing '%s' value\n", resname);
-			ret = -EINVAL;
-			goto out;
-		}
-		ret = rdtgroup_parse_resource(resname, tok, rdtgrp);
-		if (ret)
-			goto out;
-	}
-
-	list_for_each_entry(s, &resctrl_schema_all, list) {
-		r = s->res;
-
-		/*
-		 * Writes to mba_sc resources update the software controller,
-		 * not the control MSR.
-		 */
-		if (is_mba_sc(r))
-			continue;
-
-		ret = resctrl_arch_update_domains(r, rdtgrp->closid);
-		if (ret)
-			goto out;
-	}
-
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-		/*
-		 * If pseudo-locking fails we keep the resource group in
-		 * mode RDT_MODE_PSEUDO_LOCKSETUP with its class of service
-		 * active and updated for just the domain the pseudo-locked
-		 * region was requested for.
-		 */
-		ret = rdtgroup_pseudo_lock_create(rdtgrp);
-	}
-
-out:
-	rdt_staged_configs_clear();
-	rdtgroup_kn_unlock(of->kn);
-	return ret ?: nbytes;
-}
-
 u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_ctrl_domain *d,
 			    u32 closid, enum resctrl_conf_type type)
 {
@@ -453,282 +91,3 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_ctrl_domain *d,
 
 	return hw_dom->ctrl_val[idx];
 }
-
-static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
-{
-	struct rdt_resource *r = schema->res;
-	struct rdt_ctrl_domain *dom;
-	bool sep = false;
-	u32 ctrl_val;
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	seq_printf(s, "%*s:", max_name_width, schema->name);
-	list_for_each_entry(dom, &r->ctrl_domains, hdr.list) {
-		if (sep)
-			seq_puts(s, ";");
-
-		if (is_mba_sc(r))
-			ctrl_val = dom->mbps_val[closid];
-		else
-			ctrl_val = resctrl_arch_get_config(r, dom, closid,
-							   schema->conf_type);
-
-		seq_printf(s, schema->fmt_str, dom->hdr.id, ctrl_val);
-		sep = true;
-	}
-	seq_puts(s, "\n");
-}
-
-int rdtgroup_schemata_show(struct kernfs_open_file *of,
-			   struct seq_file *s, void *v)
-{
-	struct resctrl_schema *schema;
-	struct rdtgroup *rdtgrp;
-	int ret = 0;
-	u32 closid;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (rdtgrp) {
-		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-			list_for_each_entry(schema, &resctrl_schema_all, list) {
-				seq_printf(s, "%s:uninitialized\n", schema->name);
-			}
-		} else if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
-			if (!rdtgrp->plr->d) {
-				rdt_last_cmd_clear();
-				rdt_last_cmd_puts("Cache domain offline\n");
-				ret = -ENODEV;
-			} else {
-				seq_printf(s, "%s:%d=%x\n",
-					   rdtgrp->plr->s->res->name,
-					   rdtgrp->plr->d->hdr.id,
-					   rdtgrp->plr->cbm);
-			}
-		} else {
-			closid = rdtgrp->closid;
-			list_for_each_entry(schema, &resctrl_schema_all, list) {
-				if (closid < schema->num_closid)
-					show_doms(s, schema, closid);
-			}
-		}
-	} else {
-		ret = -ENOENT;
-	}
-	rdtgroup_kn_unlock(of->kn);
-	return ret;
-}
-
-static int smp_mon_event_count(void *arg)
-{
-	mon_event_count(arg);
-
-	return 0;
-}
-
-ssize_t rdtgroup_mba_mbps_event_write(struct kernfs_open_file *of,
-				      char *buf, size_t nbytes, loff_t off)
-{
-	struct rdtgroup *rdtgrp;
-	int ret = 0;
-
-	/* Valid input requires a trailing newline */
-	if (nbytes == 0 || buf[nbytes - 1] != '\n')
-		return -EINVAL;
-	buf[nbytes - 1] = '\0';
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (!rdtgrp) {
-		rdtgroup_kn_unlock(of->kn);
-		return -ENOENT;
-	}
-	rdt_last_cmd_clear();
-
-	if (!strcmp(buf, "mbm_local_bytes")) {
-		if (resctrl_arch_is_mbm_local_enabled())
-			rdtgrp->mba_mbps_event = QOS_L3_MBM_LOCAL_EVENT_ID;
-		else
-			ret = -EINVAL;
-	} else if (!strcmp(buf, "mbm_total_bytes")) {
-		if (resctrl_arch_is_mbm_total_enabled())
-			rdtgrp->mba_mbps_event = QOS_L3_MBM_TOTAL_EVENT_ID;
-		else
-			ret = -EINVAL;
-	} else {
-		ret = -EINVAL;
-	}
-
-	if (ret)
-		rdt_last_cmd_printf("Unsupported event id '%s'\n", buf);
-
-	rdtgroup_kn_unlock(of->kn);
-
-	return ret ?: nbytes;
-}
-
-int rdtgroup_mba_mbps_event_show(struct kernfs_open_file *of,
-				 struct seq_file *s, void *v)
-{
-	struct rdtgroup *rdtgrp;
-	int ret = 0;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-
-	if (rdtgrp) {
-		switch (rdtgrp->mba_mbps_event) {
-		case QOS_L3_MBM_LOCAL_EVENT_ID:
-			seq_puts(s, "mbm_local_bytes\n");
-			break;
-		case QOS_L3_MBM_TOTAL_EVENT_ID:
-			seq_puts(s, "mbm_total_bytes\n");
-			break;
-		default:
-			pr_warn_once("Bad event %d\n", rdtgrp->mba_mbps_event);
-			ret = -EINVAL;
-			break;
-		}
-	} else {
-		ret = -ENOENT;
-	}
-
-	rdtgroup_kn_unlock(of->kn);
-
-	return ret;
-}
-
-struct rdt_domain_hdr *resctrl_find_domain(struct list_head *h, int id,
-					   struct list_head **pos)
-{
-	struct rdt_domain_hdr *d;
-	struct list_head *l;
-
-	list_for_each(l, h) {
-		d = list_entry(l, struct rdt_domain_hdr, list);
-		/* When id is found, return its domain. */
-		if (id == d->id)
-			return d;
-		/* Stop searching when finding id's position in sorted list. */
-		if (id < d->id)
-			break;
-	}
-
-	if (pos)
-		*pos = l;
-
-	return NULL;
-}
-
-void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
-		    struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
-		    cpumask_t *cpumask, int evtid, int first)
-{
-	int cpu;
-
-	/* When picking a CPU from cpu_mask, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	/*
-	 * Setup the parameters to pass to mon_event_count() to read the data.
-	 */
-	rr->rgrp = rdtgrp;
-	rr->evtid = evtid;
-	rr->r = r;
-	rr->d = d;
-	rr->first = first;
-	rr->arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, evtid);
-	if (IS_ERR(rr->arch_mon_ctx)) {
-		rr->err = -EINVAL;
-		return;
-	}
-
-	cpu = cpumask_any_housekeeping(cpumask, RESCTRL_PICK_ANY_CPU);
-
-	/*
-	 * cpumask_any_housekeeping() prefers housekeeping CPUs, but
-	 * are all the CPUs nohz_full? If yes, pick a CPU to IPI.
-	 * MPAM's resctrl_arch_rmid_read() is unable to read the
-	 * counters on some platforms if its called in IRQ context.
-	 */
-	if (tick_nohz_full_cpu(cpu))
-		smp_call_function_any(cpumask, mon_event_count, rr, 1);
-	else
-		smp_call_on_cpu(cpu, smp_mon_event_count, rr, false);
-
-	resctrl_arch_mon_ctx_free(r, evtid, rr->arch_mon_ctx);
-}
-
-int rdtgroup_mondata_show(struct seq_file *m, void *arg)
-{
-	struct kernfs_open_file *of = m->private;
-	enum resctrl_res_level resid;
-	enum resctrl_event_id evtid;
-	struct rdt_domain_hdr *hdr;
-	struct rmid_read rr = {0};
-	struct rdt_mon_domain *d;
-	struct rdtgroup *rdtgrp;
-	struct rdt_resource *r;
-	struct mon_data *md;
-	int domid, ret = 0;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (!rdtgrp) {
-		ret = -ENOENT;
-		goto out;
-	}
-
-	md = of->kn->priv;
-	if (WARN_ON_ONCE(!md)) {
-		ret = -EIO;
-		goto out;
-	}
-
-	resid = md->rid;
-	domid = md->domid;
-	evtid = md->evtid;
-	r = resctrl_arch_get_resource(resid);
-
-	if (md->sum) {
-		/*
-		 * This file requires summing across all domains that share
-		 * the L3 cache id that was provided in the "domid" field of the
-		 * struct mon_data. Search all domains in the resource for
-		 * one that matches this cache id.
-		 */
-		list_for_each_entry(d, &r->mon_domains, hdr.list) {
-			if (d->ci->id == domid) {
-				rr.ci = d->ci;
-				mon_event_read(&rr, r, NULL, rdtgrp,
-					       &d->ci->shared_cpu_map, evtid, false);
-				goto checkresult;
-			}
-		}
-		ret = -ENOENT;
-		goto out;
-	} else {
-		/*
-		 * This file provides data from a single domain. Search
-		 * the resource to find the domain with "domid".
-		 */
-		hdr = resctrl_find_domain(&r->mon_domains, domid, NULL);
-		if (!hdr || WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN)) {
-			ret = -ENOENT;
-			goto out;
-		}
-		d = container_of(hdr, struct rdt_mon_domain, hdr);
-		mon_event_read(&rr, r, d, rdtgrp, &d->hdr.cpu_mask, evtid, false);
-	}
-
-checkresult:
-
-	if (rr.err == -EIO)
-		seq_puts(m, "Error\n");
-	else if (rr.err == -EINVAL)
-		seq_puts(m, "Unavailable\n");
-	else
-		seq_printf(m, "%llu\n", rr.val);
-
-out:
-	rdtgroup_kn_unlock(of->kn);
-	return ret;
-}
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index dc63ac538a81..5e3c41b36437 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -3,24 +3,21 @@
 #define _ASM_X86_RESCTRL_INTERNAL_H
 
 #include <linux/resctrl.h>
-#include <linux/sched.h>
-#include <linux/kernfs.h>
-#include <linux/fs_context.h>
-#include <linux/jump_label.h>
-#include <linux/tick.h>
 
 #define L3_QOS_CDP_ENABLE		0x01ULL
 
 #define L2_QOS_CDP_ENABLE		0x01ULL
 
-#define CQM_LIMBOCHECK_INTERVAL	1000
-
 #define MBM_CNTR_WIDTH_BASE		24
+
 #define MBA_IS_LINEAR			0x4
+
 #define MBM_CNTR_WIDTH_OFFSET_AMD	20
 
 #define RMID_VAL_ERROR			BIT_ULL(63)
+
 #define RMID_VAL_UNAVAIL		BIT_ULL(62)
+
 /*
  * With the above fields in use 62 bits remain in MSR_IA32_QM_CTR for
  * data to be returned. The counter width is discovered from the hardware
@@ -28,263 +25,6 @@
  */
 #define MBM_CNTR_WIDTH_OFFSET_MAX (62 - MBM_CNTR_WIDTH_BASE)
 
-/**
- * cpumask_any_housekeeping() - Choose any CPU in @mask, preferring those that
- *			        aren't marked nohz_full
- * @mask:	The mask to pick a CPU from.
- * @exclude_cpu:The CPU to avoid picking.
- *
- * Returns a CPU from @mask, but not @exclude_cpu. If there are housekeeping
- * CPUs that don't use nohz_full, these are preferred. Pass
- * RESCTRL_PICK_ANY_CPU to avoid excluding any CPUs.
- *
- * When a CPU is excluded, returns >= nr_cpu_ids if no CPUs are available.
- */
-static inline unsigned int
-cpumask_any_housekeeping(const struct cpumask *mask, int exclude_cpu)
-{
-	unsigned int cpu;
-
-	/* Try to find a CPU that isn't nohz_full to use in preference */
-	if (tick_nohz_full_enabled()) {
-		cpu = cpumask_any_andnot_but(mask, tick_nohz_full_mask, exclude_cpu);
-		if (cpu < nr_cpu_ids)
-			return cpu;
-	}
-
-	return cpumask_any_but(mask, exclude_cpu);
-}
-
-struct rdt_fs_context {
-	struct kernfs_fs_context	kfc;
-	bool				enable_cdpl2;
-	bool				enable_cdpl3;
-	bool				enable_mba_mbps;
-	bool				enable_debug;
-};
-
-static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
-{
-	struct kernfs_fs_context *kfc = fc->fs_private;
-
-	return container_of(kfc, struct rdt_fs_context, kfc);
-}
-
-/**
- * struct mon_evt - Entry in the event list of a resource
- * @evtid:		event id
- * @name:		name of the event
- * @configurable:	true if the event is configurable
- * @list:		entry in &rdt_resource->evt_list
- */
-struct mon_evt {
-	enum resctrl_event_id	evtid;
-	char			*name;
-	bool			configurable;
-	struct list_head	list;
-};
-
-/**
- * struct mon_data - Monitoring details for each event file.
- * @list:            Member of the global @mon_data_kn_priv_list list.
- * @rid:             Resource id associated with the event file.
- * @evtid:           Event id associated with the event file.
- * @sum:             Set when event must be summed across multiple
- *                   domains.
- * @domid:           When @sum is zero this is the domain to which
- *                   the event file belongs. When @sum is one this
- *                   is the id of the L3 cache that all domains to be
- *                   summed share.
- *
- * Pointed to by the kernfs kn->priv field of monitoring event files.
- * Readers and writers must hold rdtgroup_mutex.
- */
-struct mon_data {
-	struct list_head	list;
-	enum resctrl_res_level	rid;
-	enum resctrl_event_id	evtid;
-	int			domid;
-	bool			sum;
-};
-
-/**
- * struct rmid_read - Data passed across smp_call*() to read event count.
- * @rgrp:  Resource group for which the counter is being read. If it is a parent
- *	   resource group then its event count is summed with the count from all
- *	   its child resource groups.
- * @r:	   Resource describing the properties of the event being read.
- * @d:	   Domain that the counter should be read from. If NULL then sum all
- *	   domains in @r sharing L3 @ci.id
- * @evtid: Which monitor event to read.
- * @first: Initialize MBM counter when true.
- * @ci:    Cacheinfo for L3. Only set when @d is NULL. Used when summing domains.
- * @err:   Error encountered when reading counter.
- * @val:   Returned value of event counter. If @rgrp is a parent resource group,
- *	   @val includes the sum of event counts from its child resource groups.
- *	   If @d is NULL, @val includes the sum of all domains in @r sharing @ci.id,
- *	   (summed across child resource groups if @rgrp is a parent resource group).
- * @arch_mon_ctx: Hardware monitor allocated for this read request (MPAM only).
- */
-struct rmid_read {
-	struct rdtgroup		*rgrp;
-	struct rdt_resource	*r;
-	struct rdt_mon_domain	*d;
-	enum resctrl_event_id	evtid;
-	bool			first;
-	struct cacheinfo	*ci;
-	int			err;
-	u64			val;
-	void			*arch_mon_ctx;
-};
-
-extern struct list_head resctrl_schema_all;
-extern bool resctrl_mounted;
-
-enum rdt_group_type {
-	RDTCTRL_GROUP = 0,
-	RDTMON_GROUP,
-	RDT_NUM_GROUP,
-};
-
-/**
- * enum rdtgrp_mode - Mode of a RDT resource group
- * @RDT_MODE_SHAREABLE: This resource group allows sharing of its allocations
- * @RDT_MODE_EXCLUSIVE: No sharing of this resource group's allocations allowed
- * @RDT_MODE_PSEUDO_LOCKSETUP: Resource group will be used for Pseudo-Locking
- * @RDT_MODE_PSEUDO_LOCKED: No sharing of this resource group's allocations
- *                          allowed AND the allocations are Cache Pseudo-Locked
- * @RDT_NUM_MODES: Total number of modes
- *
- * The mode of a resource group enables control over the allowed overlap
- * between allocations associated with different resource groups (classes
- * of service). User is able to modify the mode of a resource group by
- * writing to the "mode" resctrl file associated with the resource group.
- *
- * The "shareable", "exclusive", and "pseudo-locksetup" modes are set by
- * writing the appropriate text to the "mode" file. A resource group enters
- * "pseudo-locked" mode after the schemata is written while the resource
- * group is in "pseudo-locksetup" mode.
- */
-enum rdtgrp_mode {
-	RDT_MODE_SHAREABLE = 0,
-	RDT_MODE_EXCLUSIVE,
-	RDT_MODE_PSEUDO_LOCKSETUP,
-	RDT_MODE_PSEUDO_LOCKED,
-
-	/* Must be last */
-	RDT_NUM_MODES,
-};
-
-/**
- * struct mongroup - store mon group's data in resctrl fs.
- * @mon_data_kn:		kernfs node for the mon_data directory
- * @parent:			parent rdtgrp
- * @crdtgrp_list:		child rdtgroup node list
- * @rmid:			rmid for this rdtgroup
- */
-struct mongroup {
-	struct kernfs_node	*mon_data_kn;
-	struct rdtgroup		*parent;
-	struct list_head	crdtgrp_list;
-	u32			rmid;
-};
-
-/**
- * struct rdtgroup - store rdtgroup's data in resctrl file system.
- * @kn:				kernfs node
- * @rdtgroup_list:		linked list for all rdtgroups
- * @closid:			closid for this rdtgroup
- * @cpu_mask:			CPUs assigned to this rdtgroup
- * @flags:			status bits
- * @waitcount:			how many cpus expect to find this
- *				group when they acquire rdtgroup_mutex
- * @type:			indicates type of this rdtgroup - either
- *				monitor only or ctrl_mon group
- * @mon:			mongroup related data
- * @mode:			mode of resource group
- * @mba_mbps_event:		input monitoring event id when mba_sc is enabled
- * @plr:			pseudo-locked region
- */
-struct rdtgroup {
-	struct kernfs_node		*kn;
-	struct list_head		rdtgroup_list;
-	u32				closid;
-	struct cpumask			cpu_mask;
-	int				flags;
-	atomic_t			waitcount;
-	enum rdt_group_type		type;
-	struct mongroup			mon;
-	enum rdtgrp_mode		mode;
-	enum resctrl_event_id		mba_mbps_event;
-	struct pseudo_lock_region	*plr;
-};
-
-/* rdtgroup.flags */
-#define	RDT_DELETED		1
-
-/* rftype.flags */
-#define RFTYPE_FLAGS_CPUS_LIST	1
-
-/*
- * Define the file type flags for base and info directories.
- */
-#define RFTYPE_INFO			BIT(0)
-#define RFTYPE_BASE			BIT(1)
-#define RFTYPE_CTRL			BIT(4)
-#define RFTYPE_MON			BIT(5)
-#define RFTYPE_TOP			BIT(6)
-#define RFTYPE_RES_CACHE		BIT(8)
-#define RFTYPE_RES_MB			BIT(9)
-#define RFTYPE_DEBUG			BIT(10)
-#define RFTYPE_CTRL_INFO		(RFTYPE_INFO | RFTYPE_CTRL)
-#define RFTYPE_MON_INFO			(RFTYPE_INFO | RFTYPE_MON)
-#define RFTYPE_TOP_INFO			(RFTYPE_INFO | RFTYPE_TOP)
-#define RFTYPE_CTRL_BASE		(RFTYPE_BASE | RFTYPE_CTRL)
-#define RFTYPE_MON_BASE			(RFTYPE_BASE | RFTYPE_MON)
-
-/* List of all resource groups */
-extern struct list_head rdt_all_groups;
-
-extern int max_name_width;
-
-/**
- * struct rftype - describe each file in the resctrl file system
- * @name:	File name
- * @mode:	Access mode
- * @kf_ops:	File operations
- * @flags:	File specific RFTYPE_FLAGS_* flags
- * @fflags:	File specific RFTYPE_* flags
- * @seq_show:	Show content of the file
- * @write:	Write to the file
- */
-struct rftype {
-	char			*name;
-	umode_t			mode;
-	const struct kernfs_ops	*kf_ops;
-	unsigned long		flags;
-	unsigned long		fflags;
-
-	int (*seq_show)(struct kernfs_open_file *of,
-			struct seq_file *sf, void *v);
-	/*
-	 * write() is the generic write callback which maps directly to
-	 * kernfs write operation and overrides all other operations.
-	 * Maximum write size is determined by ->max_write_len.
-	 */
-	ssize_t (*write)(struct kernfs_open_file *of,
-			 char *buf, size_t nbytes, loff_t off);
-};
-
-/**
- * struct mbm_state - status for each MBM counter in each domain
- * @prev_bw_bytes: Previous bytes value read for bandwidth calculation
- * @prev_bw:	The most recent bandwidth in MBps
- */
-struct mbm_state {
-	u64	prev_bw_bytes;
-	u32	prev_bw;
-};
-
 /**
  * struct arch_mbm_state - values used to compute resctrl_arch_rmid_read()s
  *			   return value.
@@ -382,17 +122,7 @@ static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r
 	return container_of(r, struct rdt_hw_resource, r_resctrl);
 }
 
-extern struct mutex rdtgroup_mutex;
-
-static inline const char *rdt_kn_name(const struct kernfs_node *kn)
-{
-	return rcu_dereference_check(kn->name, lockdep_is_held(&rdtgroup_mutex));
-}
-
 extern struct rdt_hw_resource rdt_resources_all[];
-extern struct rdtgroup rdtgroup_default;
-extern struct dentry *debugfs_resctrl;
-extern enum resctrl_event_id mba_mbps_default_event;
 
 void arch_mon_domain_online(struct rdt_resource *r, struct rdt_mon_domain *d);
 
@@ -429,99 +159,14 @@ union cpuid_0x10_x_edx {
 	unsigned int full;
 };
 
-void rdt_last_cmd_clear(void);
-void rdt_last_cmd_puts(const char *s);
-__printf(1, 2)
-void rdt_last_cmd_printf(const char *fmt, ...);
-
 void rdt_ctrl_update(void *arg);
-struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn);
-void rdtgroup_kn_unlock(struct kernfs_node *kn);
-int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name);
-int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
-			     umode_t mask);
-ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
-				char *buf, size_t nbytes, loff_t off);
-int rdtgroup_schemata_show(struct kernfs_open_file *of,
-			   struct seq_file *s, void *v);
-ssize_t rdtgroup_mba_mbps_event_write(struct kernfs_open_file *of,
-				      char *buf, size_t nbytes, loff_t off);
-int rdtgroup_mba_mbps_event_show(struct kernfs_open_file *of,
-				 struct seq_file *s, void *v);
-bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_ctrl_domain *d,
-			   unsigned long cbm, int closid, bool exclusive);
-unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_ctrl_domain *d,
-				  unsigned long cbm);
-enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
-int rdtgroup_tasks_assigned(struct rdtgroup *r);
-int closids_supported(void);
-void closid_free(int closid);
-int alloc_rmid(u32 closid);
-void free_rmid(u32 closid, u32 rmid);
-int rdt_get_mon_l3_config(struct rdt_resource *r);
-void resctrl_mon_resource_exit(void);
-bool rdt_cpu_has(int flag);
-void mon_event_count(void *info);
-int rdtgroup_mondata_show(struct seq_file *m, void *arg);
-void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
-		    struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
-		    cpumask_t *cpumask, int evtid, int first);
-int resctrl_mon_resource_init(void);
-void mbm_setup_overflow_handler(struct rdt_mon_domain *dom,
-				unsigned long delay_ms,
-				int exclude_cpu);
-void mbm_handle_overflow(struct work_struct *work);
-void __init intel_rdt_mbm_apply_quirk(void);
-bool is_mba_sc(struct rdt_resource *r);
-void cqm_setup_limbo_handler(struct rdt_mon_domain *dom, unsigned long delay_ms,
-			     int exclude_cpu);
-void cqm_handle_limbo(struct work_struct *work);
-bool has_busy_rmid(struct rdt_mon_domain *d);
-void __check_limbo(struct rdt_mon_domain *d, bool force_free);
-void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
-void resctrl_file_fflags_init(const char *config, unsigned long fflags);
-void rdt_staged_configs_clear(void);
-bool closid_allocated(unsigned int closid);
-int resctrl_find_cleanest_closid(void);
-
-#ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
-int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
-int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp);
-bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_ctrl_domain *d, unsigned long cbm);
-bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_ctrl_domain *d);
-int rdt_pseudo_lock_init(void);
-void rdt_pseudo_lock_release(void);
-int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
-void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
-#else
-static inline int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
-{
-	return -EOPNOTSUPP;
-}
 
-static inline int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
-{
-	return -EOPNOTSUPP;
-}
-
-static inline bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_ctrl_domain *d, unsigned long cbm)
-{
-	return false;
-}
+int rdt_get_mon_l3_config(struct rdt_resource *r);
 
-static inline bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_ctrl_domain *d)
-{
-	return false;
-}
+bool rdt_cpu_has(int flag);
 
-static inline int rdt_pseudo_lock_init(void) { return 0; }
-static inline void rdt_pseudo_lock_release(void) { }
-static inline int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
-{
-	return -EOPNOTSUPP;
-}
+void __init intel_rdt_mbm_apply_quirk(void);
 
-static inline void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp) { }
-#endif /* CONFIG_RESCTRL_FS_PSEUDO_LOCK */
+void rdt_domain_reconfigure_cdp(struct rdt_resource *r);
 
 #endif /* _ASM_X86_RESCTRL_INTERNAL_H */
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 8847c23e9ac1..3fc4d9f56f0d 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -18,65 +18,12 @@
 #define pr_fmt(fmt)	"resctrl: " fmt
 
 #include <linux/cpu.h>
-#include <linux/module.h>
 #include <linux/resctrl.h>
-#include <linux/sizes.h>
-#include <linux/slab.h>
 
 #include <asm/cpu_device_id.h>
 
 #include "internal.h"
 
-#define CREATE_TRACE_POINTS
-#include "monitor_trace.h"
-
-/**
- * struct rmid_entry - dirty tracking for all RMID.
- * @closid:	The CLOSID for this entry.
- * @rmid:	The RMID for this entry.
- * @busy:	The number of domains with cached data using this RMID.
- * @list:	Member of the rmid_free_lru list when busy == 0.
- *
- * Depending on the architecture the correct monitor is accessed using
- * both @closid and @rmid, or @rmid only.
- *
- * Take the rdtgroup_mutex when accessing.
- */
-struct rmid_entry {
-	u32				closid;
-	u32				rmid;
-	int				busy;
-	struct list_head		list;
-};
-
-/*
- * @rmid_free_lru - A least recently used list of free RMIDs
- *     These RMIDs are guaranteed to have an occupancy less than the
- *     threshold occupancy
- */
-static LIST_HEAD(rmid_free_lru);
-
-/*
- * @closid_num_dirty_rmid    The number of dirty RMID each CLOSID has.
- *     Only allocated when CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID is defined.
- *     Indexed by CLOSID. Protected by rdtgroup_mutex.
- */
-static u32 *closid_num_dirty_rmid;
-
-/*
- * @rmid_limbo_count - count of currently unused but (potentially)
- *     dirty RMIDs.
- *     This counts RMIDs that no one is currently using but that
- *     may have a occupancy value > resctrl_rmid_realloc_threshold. User can
- *     change the threshold occupancy value.
- */
-static unsigned int rmid_limbo_count;
-
-/*
- * @rmid_entry - The entry in the limbo and free lists.
- */
-static struct rmid_entry	*rmid_ptrs;
-
 /*
  * Global boolean for rdt_monitor which is true if any
  * resource monitoring is enabled.
@@ -88,23 +35,12 @@ bool rdt_mon_capable;
  */
 unsigned int rdt_mon_features;
 
-/*
- * This is the threshold cache occupancy in bytes at which we will consider an
- * RMID available for re-allocation.
- */
-unsigned int resctrl_rmid_realloc_threshold;
-
-/*
- * This is the maximum value for the reallocation threshold, in bytes.
- */
-unsigned int resctrl_rmid_realloc_limit;
-
 #define CF(cf)	((unsigned long)(1048576 * (cf) + 0.5))
 
 static int snc_nodes_per_l3_cache = 1;
 
 /*
- * The correction factor table is documented in Documentation/arch/x86/resctrl.rst.
+ * The correction factor table is documented in Documentation/filesystems/resctrl.rst.
  * If rmid > rmid threshold, MBM total and local values should be multiplied
  * by the correction factor.
  *
@@ -153,6 +89,7 @@ static const struct mbm_correction_factor_table {
 };
 
 static u32 mbm_cf_rmidthreshold __read_mostly = UINT_MAX;
+
 static u64 mbm_cf __read_mostly;
 
 static inline u64 get_corrected_mbm_count(u32 rmid, unsigned long val)
@@ -164,33 +101,6 @@ static inline u64 get_corrected_mbm_count(u32 rmid, unsigned long val)
 	return val;
 }
 
-/*
- * x86 and arm64 differ in their handling of monitoring.
- * x86's RMID are independent numbers, there is only one source of traffic
- * with an RMID value of '1'.
- * arm64's PMG extends the PARTID/CLOSID space, there are multiple sources of
- * traffic with a PMG value of '1', one for each CLOSID, meaning the RMID
- * value is no longer unique.
- * To account for this, resctrl uses an index. On x86 this is just the RMID,
- * on arm64 it encodes the CLOSID and RMID. This gives a unique number.
- *
- * The domain's rmid_busy_llc and rmid_ptrs[] are sized by index. The arch code
- * must accept an attempt to read every index.
- */
-static inline struct rmid_entry *__rmid_entry(u32 idx)
-{
-	struct rmid_entry *entry;
-	u32 closid, rmid;
-
-	entry = &rmid_ptrs[idx];
-	resctrl_arch_rmid_idx_decode(idx, &closid, &rmid);
-
-	WARN_ON_ONCE(entry->closid != closid);
-	WARN_ON_ONCE(entry->rmid != rmid);
-
-	return entry;
-}
-
 /*
  * When Sub-NUMA Cluster (SNC) mode is not enabled (as indicated by
  * "snc_nodes_per_l3_cache == 1") no translation of the RMID value is
@@ -347,769 +257,6 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_mon_domain *d,
 	return 0;
 }
 
-static void limbo_release_entry(struct rmid_entry *entry)
-{
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	rmid_limbo_count--;
-	list_add_tail(&entry->list, &rmid_free_lru);
-
-	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
-		closid_num_dirty_rmid[entry->closid]--;
-}
-
-/*
- * Check the RMIDs that are marked as busy for this domain. If the
- * reported LLC occupancy is below the threshold clear the busy bit and
- * decrement the count. If the busy count gets to zero on an RMID, we
- * free the RMID
- */
-void __check_limbo(struct rdt_mon_domain *d, bool force_free)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
-	struct rmid_entry *entry;
-	u32 idx, cur_idx = 1;
-	void *arch_mon_ctx;
-	bool rmid_dirty;
-	u64 val = 0;
-
-	arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, QOS_L3_OCCUP_EVENT_ID);
-	if (IS_ERR(arch_mon_ctx)) {
-		pr_warn_ratelimited("Failed to allocate monitor context: %ld",
-				    PTR_ERR(arch_mon_ctx));
-		return;
-	}
-
-	/*
-	 * Skip RMID 0 and start from RMID 1 and check all the RMIDs that
-	 * are marked as busy for occupancy < threshold. If the occupancy
-	 * is less than the threshold decrement the busy counter of the
-	 * RMID and move it to the free list when the counter reaches 0.
-	 */
-	for (;;) {
-		idx = find_next_bit(d->rmid_busy_llc, idx_limit, cur_idx);
-		if (idx >= idx_limit)
-			break;
-
-		entry = __rmid_entry(idx);
-		if (resctrl_arch_rmid_read(r, d, entry->closid, entry->rmid,
-					   QOS_L3_OCCUP_EVENT_ID, &val,
-					   arch_mon_ctx)) {
-			rmid_dirty = true;
-		} else {
-			rmid_dirty = (val >= resctrl_rmid_realloc_threshold);
-
-			/*
-			 * x86's CLOSID and RMID are independent numbers, so the entry's
-			 * CLOSID is an empty CLOSID (X86_RESCTRL_EMPTY_CLOSID). On Arm the
-			 * RMID (PMG) extends the CLOSID (PARTID) space with bits that aren't
-			 * used to select the configuration. It is thus necessary to track both
-			 * CLOSID and RMID because there may be dependencies between them
-			 * on some architectures.
-			 */
-			trace_mon_llc_occupancy_limbo(entry->closid, entry->rmid, d->hdr.id, val);
-		}
-
-		if (force_free || !rmid_dirty) {
-			clear_bit(idx, d->rmid_busy_llc);
-			if (!--entry->busy)
-				limbo_release_entry(entry);
-		}
-		cur_idx = idx + 1;
-	}
-
-	resctrl_arch_mon_ctx_free(r, QOS_L3_OCCUP_EVENT_ID, arch_mon_ctx);
-}
-
-bool has_busy_rmid(struct rdt_mon_domain *d)
-{
-	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
-
-	return find_first_bit(d->rmid_busy_llc, idx_limit) != idx_limit;
-}
-
-static struct rmid_entry *resctrl_find_free_rmid(u32 closid)
-{
-	struct rmid_entry *itr;
-	u32 itr_idx, cmp_idx;
-
-	if (list_empty(&rmid_free_lru))
-		return rmid_limbo_count ? ERR_PTR(-EBUSY) : ERR_PTR(-ENOSPC);
-
-	list_for_each_entry(itr, &rmid_free_lru, list) {
-		/*
-		 * Get the index of this free RMID, and the index it would need
-		 * to be if it were used with this CLOSID.
-		 * If the CLOSID is irrelevant on this architecture, the two
-		 * index values are always the same on every entry and thus the
-		 * very first entry will be returned.
-		 */
-		itr_idx = resctrl_arch_rmid_idx_encode(itr->closid, itr->rmid);
-		cmp_idx = resctrl_arch_rmid_idx_encode(closid, itr->rmid);
-
-		if (itr_idx == cmp_idx)
-			return itr;
-	}
-
-	return ERR_PTR(-ENOSPC);
-}
-
-/**
- * resctrl_find_cleanest_closid() - Find a CLOSID where all the associated
- *                                  RMID are clean, or the CLOSID that has
- *                                  the most clean RMID.
- *
- * MPAM's equivalent of RMID are per-CLOSID, meaning a freshly allocated CLOSID
- * may not be able to allocate clean RMID. To avoid this the allocator will
- * choose the CLOSID with the most clean RMID.
- *
- * When the CLOSID and RMID are independent numbers, the first free CLOSID will
- * be returned.
- */
-int resctrl_find_cleanest_closid(void)
-{
-	u32 cleanest_closid = ~0;
-	int i = 0;
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	if (!IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
-		return -EIO;
-
-	for (i = 0; i < closids_supported(); i++) {
-		int num_dirty;
-
-		if (closid_allocated(i))
-			continue;
-
-		num_dirty = closid_num_dirty_rmid[i];
-		if (num_dirty == 0)
-			return i;
-
-		if (cleanest_closid == ~0)
-			cleanest_closid = i;
-
-		if (num_dirty < closid_num_dirty_rmid[cleanest_closid])
-			cleanest_closid = i;
-	}
-
-	if (cleanest_closid == ~0)
-		return -ENOSPC;
-
-	return cleanest_closid;
-}
-
-/*
- * For MPAM the RMID value is not unique, and has to be considered with
- * the CLOSID. The (CLOSID, RMID) pair is allocated on all domains, which
- * allows all domains to be managed by a single free list.
- * Each domain also has a rmid_busy_llc to reduce the work of the limbo handler.
- */
-int alloc_rmid(u32 closid)
-{
-	struct rmid_entry *entry;
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	entry = resctrl_find_free_rmid(closid);
-	if (IS_ERR(entry))
-		return PTR_ERR(entry);
-
-	list_del(&entry->list);
-	return entry->rmid;
-}
-
-static void add_rmid_to_limbo(struct rmid_entry *entry)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	struct rdt_mon_domain *d;
-	u32 idx;
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	idx = resctrl_arch_rmid_idx_encode(entry->closid, entry->rmid);
-
-	entry->busy = 0;
-	list_for_each_entry(d, &r->mon_domains, hdr.list) {
-		/*
-		 * For the first limbo RMID in the domain,
-		 * setup up the limbo worker.
-		 */
-		if (!has_busy_rmid(d))
-			cqm_setup_limbo_handler(d, CQM_LIMBOCHECK_INTERVAL,
-						RESCTRL_PICK_ANY_CPU);
-		set_bit(idx, d->rmid_busy_llc);
-		entry->busy++;
-	}
-
-	rmid_limbo_count++;
-	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
-		closid_num_dirty_rmid[entry->closid]++;
-}
-
-void free_rmid(u32 closid, u32 rmid)
-{
-	u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
-	struct rmid_entry *entry;
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	/*
-	 * Do not allow the default rmid to be free'd. Comparing by index
-	 * allows architectures that ignore the closid parameter to avoid an
-	 * unnecessary check.
-	 */
-	if (!resctrl_arch_mon_capable() ||
-	    idx == resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
-						RESCTRL_RESERVED_RMID))
-		return;
-
-	entry = __rmid_entry(idx);
-
-	if (resctrl_arch_is_llc_occupancy_enabled())
-		add_rmid_to_limbo(entry);
-	else
-		list_add_tail(&entry->list, &rmid_free_lru);
-}
-
-static struct mbm_state *get_mbm_state(struct rdt_mon_domain *d, u32 closid,
-				       u32 rmid, enum resctrl_event_id evtid)
-{
-	u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
-
-	switch (evtid) {
-	case QOS_L3_MBM_TOTAL_EVENT_ID:
-		return &d->mbm_total[idx];
-	case QOS_L3_MBM_LOCAL_EVENT_ID:
-		return &d->mbm_local[idx];
-	default:
-		return NULL;
-	}
-}
-
-static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
-{
-	int cpu = smp_processor_id();
-	struct rdt_mon_domain *d;
-	struct mbm_state *m;
-	int err, ret;
-	u64 tval = 0;
-
-	if (rr->first) {
-		resctrl_arch_reset_rmid(rr->r, rr->d, closid, rmid, rr->evtid);
-		m = get_mbm_state(rr->d, closid, rmid, rr->evtid);
-		if (m)
-			memset(m, 0, sizeof(struct mbm_state));
-		return 0;
-	}
-
-	if (rr->d) {
-		/* Reading a single domain, must be on a CPU in that domain. */
-		if (!cpumask_test_cpu(cpu, &rr->d->hdr.cpu_mask))
-			return -EINVAL;
-		rr->err = resctrl_arch_rmid_read(rr->r, rr->d, closid, rmid,
-						 rr->evtid, &tval, rr->arch_mon_ctx);
-		if (rr->err)
-			return rr->err;
-
-		rr->val += tval;
-
-		return 0;
-	}
-
-	/* Summing domains that share a cache, must be on a CPU for that cache. */
-	if (!cpumask_test_cpu(cpu, &rr->ci->shared_cpu_map))
-		return -EINVAL;
-
-	/*
-	 * Legacy files must report the sum of an event across all
-	 * domains that share the same L3 cache instance.
-	 * Report success if a read from any domain succeeds, -EINVAL
-	 * (translated to "Unavailable" for user space) if reading from
-	 * all domains fail for any reason.
-	 */
-	ret = -EINVAL;
-	list_for_each_entry(d, &rr->r->mon_domains, hdr.list) {
-		if (d->ci->id != rr->ci->id)
-			continue;
-		err = resctrl_arch_rmid_read(rr->r, d, closid, rmid,
-					     rr->evtid, &tval, rr->arch_mon_ctx);
-		if (!err) {
-			rr->val += tval;
-			ret = 0;
-		}
-	}
-
-	if (ret)
-		rr->err = ret;
-
-	return ret;
-}
-
-/*
- * mbm_bw_count() - Update bw count from values previously read by
- *		    __mon_event_count().
- * @closid:	The closid used to identify the cached mbm_state.
- * @rmid:	The rmid used to identify the cached mbm_state.
- * @rr:		The struct rmid_read populated by __mon_event_count().
- *
- * Supporting function to calculate the memory bandwidth
- * and delta bandwidth in MBps. The chunks value previously read by
- * __mon_event_count() is compared with the chunks value from the previous
- * invocation. This must be called once per second to maintain values in MBps.
- */
-static void mbm_bw_count(u32 closid, u32 rmid, struct rmid_read *rr)
-{
-	u64 cur_bw, bytes, cur_bytes;
-	struct mbm_state *m;
-
-	m = get_mbm_state(rr->d, closid, rmid, rr->evtid);
-	if (WARN_ON_ONCE(!m))
-		return;
-
-	cur_bytes = rr->val;
-	bytes = cur_bytes - m->prev_bw_bytes;
-	m->prev_bw_bytes = cur_bytes;
-
-	cur_bw = bytes / SZ_1M;
-
-	m->prev_bw = cur_bw;
-}
-
-/*
- * This is scheduled by mon_event_read() to read the CQM/MBM counters
- * on a domain.
- */
-void mon_event_count(void *info)
-{
-	struct rdtgroup *rdtgrp, *entry;
-	struct rmid_read *rr = info;
-	struct list_head *head;
-	int ret;
-
-	rdtgrp = rr->rgrp;
-
-	ret = __mon_event_count(rdtgrp->closid, rdtgrp->mon.rmid, rr);
-
-	/*
-	 * For Ctrl groups read data from child monitor groups and
-	 * add them together. Count events which are read successfully.
-	 * Discard the rmid_read's reporting errors.
-	 */
-	head = &rdtgrp->mon.crdtgrp_list;
-
-	if (rdtgrp->type == RDTCTRL_GROUP) {
-		list_for_each_entry(entry, head, mon.crdtgrp_list) {
-			if (__mon_event_count(entry->closid, entry->mon.rmid,
-					      rr) == 0)
-				ret = 0;
-		}
-	}
-
-	/*
-	 * __mon_event_count() calls for newly created monitor groups may
-	 * report -EINVAL/Unavailable if the monitor hasn't seen any traffic.
-	 * Discard error if any of the monitor event reads succeeded.
-	 */
-	if (ret == 0)
-		rr->err = 0;
-}
-
-static struct rdt_ctrl_domain *get_ctrl_domain_from_cpu(int cpu,
-							struct rdt_resource *r)
-{
-	struct rdt_ctrl_domain *d;
-
-	lockdep_assert_cpus_held();
-
-	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
-		/* Find the domain that contains this CPU */
-		if (cpumask_test_cpu(cpu, &d->hdr.cpu_mask))
-			return d;
-	}
-
-	return NULL;
-}
-
-/*
- * Feedback loop for MBA software controller (mba_sc)
- *
- * mba_sc is a feedback loop where we periodically read MBM counters and
- * adjust the bandwidth percentage values via the IA32_MBA_THRTL_MSRs so
- * that:
- *
- *   current bandwidth(cur_bw) < user specified bandwidth(user_bw)
- *
- * This uses the MBM counters to measure the bandwidth and MBA throttle
- * MSRs to control the bandwidth for a particular rdtgrp. It builds on the
- * fact that resctrl rdtgroups have both monitoring and control.
- *
- * The frequency of the checks is 1s and we just tag along the MBM overflow
- * timer. Having 1s interval makes the calculation of bandwidth simpler.
- *
- * Although MBA's goal is to restrict the bandwidth to a maximum, there may
- * be a need to increase the bandwidth to avoid unnecessarily restricting
- * the L2 <-> L3 traffic.
- *
- * Since MBA controls the L2 external bandwidth where as MBM measures the
- * L3 external bandwidth the following sequence could lead to such a
- * situation.
- *
- * Consider an rdtgroup which had high L3 <-> memory traffic in initial
- * phases -> mba_sc kicks in and reduced bandwidth percentage values -> but
- * after some time rdtgroup has mostly L2 <-> L3 traffic.
- *
- * In this case we may restrict the rdtgroup's L2 <-> L3 traffic as its
- * throttle MSRs already have low percentage values.  To avoid
- * unnecessarily restricting such rdtgroups, we also increase the bandwidth.
- */
-static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_mon_domain *dom_mbm)
-{
-	u32 closid, rmid, cur_msr_val, new_msr_val;
-	struct mbm_state *pmbm_data, *cmbm_data;
-	struct rdt_ctrl_domain *dom_mba;
-	enum resctrl_event_id evt_id;
-	struct rdt_resource *r_mba;
-	struct list_head *head;
-	struct rdtgroup *entry;
-	u32 cur_bw, user_bw;
-
-	r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-	evt_id = rgrp->mba_mbps_event;
-
-	closid = rgrp->closid;
-	rmid = rgrp->mon.rmid;
-	pmbm_data = get_mbm_state(dom_mbm, closid, rmid, evt_id);
-	if (WARN_ON_ONCE(!pmbm_data))
-		return;
-
-	dom_mba = get_ctrl_domain_from_cpu(smp_processor_id(), r_mba);
-	if (!dom_mba) {
-		pr_warn_once("Failure to get domain for MBA update\n");
-		return;
-	}
-
-	cur_bw = pmbm_data->prev_bw;
-	user_bw = dom_mba->mbps_val[closid];
-
-	/* MBA resource doesn't support CDP */
-	cur_msr_val = resctrl_arch_get_config(r_mba, dom_mba, closid, CDP_NONE);
-
-	/*
-	 * For Ctrl groups read data from child monitor groups.
-	 */
-	head = &rgrp->mon.crdtgrp_list;
-	list_for_each_entry(entry, head, mon.crdtgrp_list) {
-		cmbm_data = get_mbm_state(dom_mbm, entry->closid, entry->mon.rmid, evt_id);
-		if (WARN_ON_ONCE(!cmbm_data))
-			return;
-		cur_bw += cmbm_data->prev_bw;
-	}
-
-	/*
-	 * Scale up/down the bandwidth linearly for the ctrl group.  The
-	 * bandwidth step is the bandwidth granularity specified by the
-	 * hardware.
-	 * Always increase throttling if current bandwidth is above the
-	 * target set by user.
-	 * But avoid thrashing up and down on every poll by checking
-	 * whether a decrease in throttling is likely to push the group
-	 * back over target. E.g. if currently throttling to 30% of bandwidth
-	 * on a system with 10% granularity steps, check whether moving to
-	 * 40% would go past the limit by multiplying current bandwidth by
-	 * "(30 + 10) / 30".
-	 */
-	if (cur_msr_val > r_mba->membw.min_bw && user_bw < cur_bw) {
-		new_msr_val = cur_msr_val - r_mba->membw.bw_gran;
-	} else if (cur_msr_val < MAX_MBA_BW &&
-		   (user_bw > (cur_bw * (cur_msr_val + r_mba->membw.min_bw) / cur_msr_val))) {
-		new_msr_val = cur_msr_val + r_mba->membw.bw_gran;
-	} else {
-		return;
-	}
-
-	resctrl_arch_update_one(r_mba, dom_mba, closid, CDP_NONE, new_msr_val);
-}
-
-static void mbm_update_one_event(struct rdt_resource *r, struct rdt_mon_domain *d,
-				 u32 closid, u32 rmid, enum resctrl_event_id evtid)
-{
-	struct rmid_read rr = {0};
-
-	rr.r = r;
-	rr.d = d;
-	rr.evtid = evtid;
-	rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
-	if (IS_ERR(rr.arch_mon_ctx)) {
-		pr_warn_ratelimited("Failed to allocate monitor context: %ld",
-				    PTR_ERR(rr.arch_mon_ctx));
-		return;
-	}
-
-	__mon_event_count(closid, rmid, &rr);
-
-	/*
-	 * If the software controller is enabled, compute the
-	 * bandwidth for this event id.
-	 */
-	if (is_mba_sc(NULL))
-		mbm_bw_count(closid, rmid, &rr);
-
-	resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
-}
-
-static void mbm_update(struct rdt_resource *r, struct rdt_mon_domain *d,
-		       u32 closid, u32 rmid)
-{
-	/*
-	 * This is protected from concurrent reads from user as both
-	 * the user and overflow handler hold the global mutex.
-	 */
-	if (resctrl_arch_is_mbm_total_enabled())
-		mbm_update_one_event(r, d, closid, rmid, QOS_L3_MBM_TOTAL_EVENT_ID);
-
-	if (resctrl_arch_is_mbm_local_enabled())
-		mbm_update_one_event(r, d, closid, rmid, QOS_L3_MBM_LOCAL_EVENT_ID);
-}
-
-/*
- * Handler to scan the limbo list and move the RMIDs
- * to free list whose occupancy < threshold_occupancy.
- */
-void cqm_handle_limbo(struct work_struct *work)
-{
-	unsigned long delay = msecs_to_jiffies(CQM_LIMBOCHECK_INTERVAL);
-	struct rdt_mon_domain *d;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	d = container_of(work, struct rdt_mon_domain, cqm_limbo.work);
-
-	__check_limbo(d, false);
-
-	if (has_busy_rmid(d)) {
-		d->cqm_work_cpu = cpumask_any_housekeeping(&d->hdr.cpu_mask,
-							   RESCTRL_PICK_ANY_CPU);
-		schedule_delayed_work_on(d->cqm_work_cpu, &d->cqm_limbo,
-					 delay);
-	}
-
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-}
-
-/**
- * cqm_setup_limbo_handler() - Schedule the limbo handler to run for this
- *                             domain.
- * @dom:           The domain the limbo handler should run for.
- * @delay_ms:      How far in the future the handler should run.
- * @exclude_cpu:   Which CPU the handler should not run on,
- *		   RESCTRL_PICK_ANY_CPU to pick any CPU.
- */
-void cqm_setup_limbo_handler(struct rdt_mon_domain *dom, unsigned long delay_ms,
-			     int exclude_cpu)
-{
-	unsigned long delay = msecs_to_jiffies(delay_ms);
-	int cpu;
-
-	cpu = cpumask_any_housekeeping(&dom->hdr.cpu_mask, exclude_cpu);
-	dom->cqm_work_cpu = cpu;
-
-	if (cpu < nr_cpu_ids)
-		schedule_delayed_work_on(cpu, &dom->cqm_limbo, delay);
-}
-
-void mbm_handle_overflow(struct work_struct *work)
-{
-	unsigned long delay = msecs_to_jiffies(MBM_OVERFLOW_INTERVAL);
-	struct rdtgroup *prgrp, *crgrp;
-	struct rdt_mon_domain *d;
-	struct list_head *head;
-	struct rdt_resource *r;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	/*
-	 * If the filesystem has been unmounted this work no longer needs to
-	 * run.
-	 */
-	if (!resctrl_mounted || !resctrl_arch_mon_capable())
-		goto out_unlock;
-
-	r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	d = container_of(work, struct rdt_mon_domain, mbm_over.work);
-
-	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
-		mbm_update(r, d, prgrp->closid, prgrp->mon.rmid);
-
-		head = &prgrp->mon.crdtgrp_list;
-		list_for_each_entry(crgrp, head, mon.crdtgrp_list)
-			mbm_update(r, d, crgrp->closid, crgrp->mon.rmid);
-
-		if (is_mba_sc(NULL))
-			update_mba_bw(prgrp, d);
-	}
-
-	/*
-	 * Re-check for housekeeping CPUs. This allows the overflow handler to
-	 * move off a nohz_full CPU quickly.
-	 */
-	d->mbm_work_cpu = cpumask_any_housekeeping(&d->hdr.cpu_mask,
-						   RESCTRL_PICK_ANY_CPU);
-	schedule_delayed_work_on(d->mbm_work_cpu, &d->mbm_over, delay);
-
-out_unlock:
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-}
-
-/**
- * mbm_setup_overflow_handler() - Schedule the overflow handler to run for this
- *                                domain.
- * @dom:           The domain the overflow handler should run for.
- * @delay_ms:      How far in the future the handler should run.
- * @exclude_cpu:   Which CPU the handler should not run on,
- *		   RESCTRL_PICK_ANY_CPU to pick any CPU.
- */
-void mbm_setup_overflow_handler(struct rdt_mon_domain *dom, unsigned long delay_ms,
-				int exclude_cpu)
-{
-	unsigned long delay = msecs_to_jiffies(delay_ms);
-	int cpu;
-
-	/*
-	 * When a domain comes online there is no guarantee the filesystem is
-	 * mounted. If not, there is no need to catch counter overflow.
-	 */
-	if (!resctrl_mounted || !resctrl_arch_mon_capable())
-		return;
-	cpu = cpumask_any_housekeeping(&dom->hdr.cpu_mask, exclude_cpu);
-	dom->mbm_work_cpu = cpu;
-
-	if (cpu < nr_cpu_ids)
-		schedule_delayed_work_on(cpu, &dom->mbm_over, delay);
-}
-
-static int dom_data_init(struct rdt_resource *r)
-{
-	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
-	u32 num_closid = resctrl_arch_get_num_closid(r);
-	struct rmid_entry *entry = NULL;
-	int err = 0, i;
-	u32 idx;
-
-	mutex_lock(&rdtgroup_mutex);
-	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
-		u32 *tmp;
-
-		/*
-		 * If the architecture hasn't provided a sanitised value here,
-		 * this may result in larger arrays than necessary. Resctrl will
-		 * use a smaller system wide value based on the resources in
-		 * use.
-		 */
-		tmp = kcalloc(num_closid, sizeof(*tmp), GFP_KERNEL);
-		if (!tmp) {
-			err = -ENOMEM;
-			goto out_unlock;
-		}
-
-		closid_num_dirty_rmid = tmp;
-	}
-
-	rmid_ptrs = kcalloc(idx_limit, sizeof(struct rmid_entry), GFP_KERNEL);
-	if (!rmid_ptrs) {
-		if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
-			kfree(closid_num_dirty_rmid);
-			closid_num_dirty_rmid = NULL;
-		}
-		err = -ENOMEM;
-		goto out_unlock;
-	}
-
-	for (i = 0; i < idx_limit; i++) {
-		entry = &rmid_ptrs[i];
-		INIT_LIST_HEAD(&entry->list);
-
-		resctrl_arch_rmid_idx_decode(i, &entry->closid, &entry->rmid);
-		list_add_tail(&entry->list, &rmid_free_lru);
-	}
-
-	/*
-	 * RESCTRL_RESERVED_CLOSID and RESCTRL_RESERVED_RMID are special and
-	 * are always allocated. These are used for the rdtgroup_default
-	 * control group, which will be setup later in resctrl_init().
-	 */
-	idx = resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
-					   RESCTRL_RESERVED_RMID);
-	entry = __rmid_entry(idx);
-	list_del(&entry->list);
-
-out_unlock:
-	mutex_unlock(&rdtgroup_mutex);
-
-	return err;
-}
-
-static void dom_data_exit(struct rdt_resource *r)
-{
-	mutex_lock(&rdtgroup_mutex);
-
-	if (!r->mon_capable)
-		goto out_unlock;
-
-	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
-		kfree(closid_num_dirty_rmid);
-		closid_num_dirty_rmid = NULL;
-	}
-
-	kfree(rmid_ptrs);
-	rmid_ptrs = NULL;
-
-out_unlock:
-	mutex_unlock(&rdtgroup_mutex);
-}
-
-static struct mon_evt llc_occupancy_event = {
-	.name		= "llc_occupancy",
-	.evtid		= QOS_L3_OCCUP_EVENT_ID,
-};
-
-static struct mon_evt mbm_total_event = {
-	.name		= "mbm_total_bytes",
-	.evtid		= QOS_L3_MBM_TOTAL_EVENT_ID,
-};
-
-static struct mon_evt mbm_local_event = {
-	.name		= "mbm_local_bytes",
-	.evtid		= QOS_L3_MBM_LOCAL_EVENT_ID,
-};
-
-/*
- * Initialize the event list for the resource.
- *
- * Note that MBM events are also part of RDT_RESOURCE_L3 resource
- * because as per the SDM the total and local memory bandwidth
- * are enumerated as part of L3 monitoring.
- */
-static void l3_mon_evt_init(struct rdt_resource *r)
-{
-	INIT_LIST_HEAD(&r->evt_list);
-
-	if (resctrl_arch_is_llc_occupancy_enabled())
-		list_add_tail(&llc_occupancy_event.list, &r->evt_list);
-	if (resctrl_arch_is_mbm_total_enabled())
-		list_add_tail(&mbm_total_event.list, &r->evt_list);
-	if (resctrl_arch_is_mbm_local_enabled())
-		list_add_tail(&mbm_local_event.list, &r->evt_list);
-}
-
 /*
  * The power-on reset value of MSR_RMID_SNC_CONFIG is 0x1
  * which indicates that RMIDs are configured in legacy mode.
@@ -1193,51 +340,6 @@ static __init int snc_get_config(void)
 	return ret;
 }
 
-/**
- * resctrl_mon_resource_init() - Initialise global monitoring structures.
- *
- * Allocate and initialise global monitor resources that do not belong to a
- * specific domain. i.e. the rmid_ptrs[] used for the limbo and free lists.
- * Called once during boot after the struct rdt_resource's have been configured
- * but before the filesystem is mounted.
- * Resctrl's cpuhp callbacks may be called before this point to bring a domain
- * online.
- *
- * Returns 0 for success, or -ENOMEM.
- */
-int resctrl_mon_resource_init(void)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	int ret;
-
-	if (!r->mon_capable)
-		return 0;
-
-	ret = dom_data_init(r);
-	if (ret)
-		return ret;
-
-	l3_mon_evt_init(r);
-
-	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_TOTAL_EVENT_ID)) {
-		mbm_total_event.configurable = true;
-		resctrl_file_fflags_init("mbm_total_bytes_config",
-					 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
-	}
-	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_LOCAL_EVENT_ID)) {
-		mbm_local_event.configurable = true;
-		resctrl_file_fflags_init("mbm_local_bytes_config",
-					 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
-	}
-
-	if (resctrl_arch_is_mbm_local_enabled())
-		mba_mbps_default_event = QOS_L3_MBM_LOCAL_EVENT_ID;
-	else if (resctrl_arch_is_mbm_total_enabled())
-		mba_mbps_default_event = QOS_L3_MBM_TOTAL_EVENT_ID;
-
-	return 0;
-}
-
 int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 {
 	unsigned int mbm_offset = boot_cpu_data.x86_cache_mbm_width_offset;
@@ -1285,13 +387,6 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 	return 0;
 }
 
-void resctrl_mon_resource_exit(void)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-
-	dom_data_exit(r);
-}
-
 void __init intel_rdt_mbm_apply_quirk(void)
 {
 	int cf_index;
diff --git a/arch/x86/kernel/cpu/resctrl/monitor_trace.h b/arch/x86/kernel/cpu/resctrl/monitor_trace.h
deleted file mode 100644
index ade67daf42c2..000000000000
--- a/arch/x86/kernel/cpu/resctrl/monitor_trace.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#undef TRACE_SYSTEM
-#define TRACE_SYSTEM resctrl
-
-#if !defined(_FS_RESCTRL_MONITOR_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
-#define _FS_RESCTRL_MONITOR_TRACE_H
-
-#include <linux/tracepoint.h>
-
-TRACE_EVENT(mon_llc_occupancy_limbo,
-	    TP_PROTO(u32 ctrl_hw_id, u32 mon_hw_id, int domain_id, u64 llc_occupancy_bytes),
-	    TP_ARGS(ctrl_hw_id, mon_hw_id, domain_id, llc_occupancy_bytes),
-	    TP_STRUCT__entry(__field(u32, ctrl_hw_id)
-			     __field(u32, mon_hw_id)
-			     __field(int, domain_id)
-			     __field(u64, llc_occupancy_bytes)),
-	    TP_fast_assign(__entry->ctrl_hw_id = ctrl_hw_id;
-			   __entry->mon_hw_id = mon_hw_id;
-			   __entry->domain_id = domain_id;
-			   __entry->llc_occupancy_bytes = llc_occupancy_bytes;),
-	    TP_printk("ctrl_hw_id=%u mon_hw_id=%u domain_id=%d llc_occupancy_bytes=%llu",
-		      __entry->ctrl_hw_id, __entry->mon_hw_id, __entry->domain_id,
-		      __entry->llc_occupancy_bytes)
-	   );
-
-#endif /* _FS_RESCTRL_MONITOR_TRACE_H */
-
-#undef TRACE_INCLUDE_PATH
-#define TRACE_INCLUDE_PATH .
-#define TRACE_INCLUDE_FILE monitor_trace
-#include <trace/define_trace.h>
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
index 9df4a62d0011..2e13473c5aa4 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c
@@ -12,17 +12,10 @@
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
 
 #include <linux/cacheflush.h>
-#include <linux/cacheinfo.h>
 #include <linux/cpu.h>
-#include <linux/cpumask.h>
-#include <linux/debugfs.h>
-#include <linux/kthread.h>
-#include <linux/mman.h>
 #include <linux/perf_event.h>
 #include <linux/pm_qos.h>
 #include <linux/resctrl.h>
-#include <linux/slab.h>
-#include <linux/uaccess.h>
 
 #include <asm/cpu_device_id.h>
 #include <asm/perf_event.h>
@@ -31,6 +24,7 @@
 #include "internal.h"
 
 #define CREATE_TRACE_POINTS
+
 #include "pseudo_lock_trace.h"
 
 /*
@@ -39,29 +33,6 @@
  */
 static u64 prefetch_disable_bits;
 
-/*
- * Major number assigned to and shared by all devices exposing
- * pseudo-locked regions.
- */
-static unsigned int pseudo_lock_major;
-static unsigned long pseudo_lock_minor_avail = GENMASK(MINORBITS, 0);
-
-static char *pseudo_lock_devnode(const struct device *dev, umode_t *mode)
-{
-	const struct rdtgroup *rdtgrp;
-
-	rdtgrp = dev_get_drvdata(dev);
-	if (mode)
-		*mode = 0600;
-	guard(mutex)(&rdtgroup_mutex);
-	return kasprintf(GFP_KERNEL, "pseudo_lock/%s", rdt_kn_name(rdtgrp->kn));
-}
-
-static const struct class pseudo_lock_class = {
-	.name = "pseudo_lock",
-	.devnode = pseudo_lock_devnode,
-};
-
 /**
  * resctrl_arch_get_prefetch_disable_bits - prefetch disable bits of supported
  *                                          platforms
@@ -122,298 +93,6 @@ u64 resctrl_arch_get_prefetch_disable_bits(void)
 	return prefetch_disable_bits;
 }
 
-/**
- * pseudo_lock_minor_get - Obtain available minor number
- * @minor: Pointer to where new minor number will be stored
- *
- * A bitmask is used to track available minor numbers. Here the next free
- * minor number is marked as unavailable and returned.
- *
- * Return: 0 on success, <0 on failure.
- */
-static int pseudo_lock_minor_get(unsigned int *minor)
-{
-	unsigned long first_bit;
-
-	first_bit = find_first_bit(&pseudo_lock_minor_avail, MINORBITS);
-
-	if (first_bit == MINORBITS)
-		return -ENOSPC;
-
-	__clear_bit(first_bit, &pseudo_lock_minor_avail);
-	*minor = first_bit;
-
-	return 0;
-}
-
-/**
- * pseudo_lock_minor_release - Return minor number to available
- * @minor: The minor number made available
- */
-static void pseudo_lock_minor_release(unsigned int minor)
-{
-	__set_bit(minor, &pseudo_lock_minor_avail);
-}
-
-/**
- * region_find_by_minor - Locate a pseudo-lock region by inode minor number
- * @minor: The minor number of the device representing pseudo-locked region
- *
- * When the character device is accessed we need to determine which
- * pseudo-locked region it belongs to. This is done by matching the minor
- * number of the device to the pseudo-locked region it belongs.
- *
- * Minor numbers are assigned at the time a pseudo-locked region is associated
- * with a cache instance.
- *
- * Return: On success return pointer to resource group owning the pseudo-locked
- *         region, NULL on failure.
- */
-static struct rdtgroup *region_find_by_minor(unsigned int minor)
-{
-	struct rdtgroup *rdtgrp, *rdtgrp_match = NULL;
-
-	list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
-		if (rdtgrp->plr && rdtgrp->plr->minor == minor) {
-			rdtgrp_match = rdtgrp;
-			break;
-		}
-	}
-	return rdtgrp_match;
-}
-
-/**
- * struct pseudo_lock_pm_req - A power management QoS request list entry
- * @list:	Entry within the @pm_reqs list for a pseudo-locked region
- * @req:	PM QoS request
- */
-struct pseudo_lock_pm_req {
-	struct list_head list;
-	struct dev_pm_qos_request req;
-};
-
-static void pseudo_lock_cstates_relax(struct pseudo_lock_region *plr)
-{
-	struct pseudo_lock_pm_req *pm_req, *next;
-
-	list_for_each_entry_safe(pm_req, next, &plr->pm_reqs, list) {
-		dev_pm_qos_remove_request(&pm_req->req);
-		list_del(&pm_req->list);
-		kfree(pm_req);
-	}
-}
-
-/**
- * pseudo_lock_cstates_constrain - Restrict cores from entering C6
- * @plr: Pseudo-locked region
- *
- * To prevent the cache from being affected by power management entering
- * C6 has to be avoided. This is accomplished by requesting a latency
- * requirement lower than lowest C6 exit latency of all supported
- * platforms as found in the cpuidle state tables in the intel_idle driver.
- * At this time it is possible to do so with a single latency requirement
- * for all supported platforms.
- *
- * Since Goldmont is supported, which is affected by X86_BUG_MONITOR,
- * the ACPI latencies need to be considered while keeping in mind that C2
- * may be set to map to deeper sleep states. In this case the latency
- * requirement needs to prevent entering C2 also.
- *
- * Return: 0 on success, <0 on failure
- */
-static int pseudo_lock_cstates_constrain(struct pseudo_lock_region *plr)
-{
-	struct pseudo_lock_pm_req *pm_req;
-	int cpu;
-	int ret;
-
-	for_each_cpu(cpu, &plr->d->hdr.cpu_mask) {
-		pm_req = kzalloc(sizeof(*pm_req), GFP_KERNEL);
-		if (!pm_req) {
-			rdt_last_cmd_puts("Failure to allocate memory for PM QoS\n");
-			ret = -ENOMEM;
-			goto out_err;
-		}
-		ret = dev_pm_qos_add_request(get_cpu_device(cpu),
-					     &pm_req->req,
-					     DEV_PM_QOS_RESUME_LATENCY,
-					     30);
-		if (ret < 0) {
-			rdt_last_cmd_printf("Failed to add latency req CPU%d\n",
-					    cpu);
-			kfree(pm_req);
-			ret = -1;
-			goto out_err;
-		}
-		list_add(&pm_req->list, &plr->pm_reqs);
-	}
-
-	return 0;
-
-out_err:
-	pseudo_lock_cstates_relax(plr);
-	return ret;
-}
-
-/**
- * pseudo_lock_region_clear - Reset pseudo-lock region data
- * @plr: pseudo-lock region
- *
- * All content of the pseudo-locked region is reset - any memory allocated
- * freed.
- *
- * Return: void
- */
-static void pseudo_lock_region_clear(struct pseudo_lock_region *plr)
-{
-	plr->size = 0;
-	plr->line_size = 0;
-	kfree(plr->kmem);
-	plr->kmem = NULL;
-	plr->s = NULL;
-	if (plr->d)
-		plr->d->plr = NULL;
-	plr->d = NULL;
-	plr->cbm = 0;
-	plr->debugfs_dir = NULL;
-}
-
-/**
- * pseudo_lock_region_init - Initialize pseudo-lock region information
- * @plr: pseudo-lock region
- *
- * Called after user provided a schemata to be pseudo-locked. From the
- * schemata the &struct pseudo_lock_region is on entry already initialized
- * with the resource, domain, and capacity bitmask. Here the information
- * required for pseudo-locking is deduced from this data and &struct
- * pseudo_lock_region initialized further. This information includes:
- * - size in bytes of the region to be pseudo-locked
- * - cache line size to know the stride with which data needs to be accessed
- *   to be pseudo-locked
- * - a cpu associated with the cache instance on which the pseudo-locking
- *   flow can be executed
- *
- * Return: 0 on success, <0 on failure. Descriptive error will be written
- * to last_cmd_status buffer.
- */
-static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
-{
-	enum resctrl_scope scope = plr->s->res->ctrl_scope;
-	struct cacheinfo *ci;
-	int ret;
-
-	if (WARN_ON_ONCE(scope != RESCTRL_L2_CACHE && scope != RESCTRL_L3_CACHE))
-		return -ENODEV;
-
-	/* Pick the first cpu we find that is associated with the cache. */
-	plr->cpu = cpumask_first(&plr->d->hdr.cpu_mask);
-
-	if (!cpu_online(plr->cpu)) {
-		rdt_last_cmd_printf("CPU %u associated with cache not online\n",
-				    plr->cpu);
-		ret = -ENODEV;
-		goto out_region;
-	}
-
-	ci = get_cpu_cacheinfo_level(plr->cpu, scope);
-	if (ci) {
-		plr->line_size = ci->coherency_line_size;
-		plr->size = rdtgroup_cbm_to_size(plr->s->res, plr->d, plr->cbm);
-		return 0;
-	}
-
-	ret = -1;
-	rdt_last_cmd_puts("Unable to determine cache line size\n");
-out_region:
-	pseudo_lock_region_clear(plr);
-	return ret;
-}
-
-/**
- * pseudo_lock_init - Initialize a pseudo-lock region
- * @rdtgrp: resource group to which new pseudo-locked region will belong
- *
- * A pseudo-locked region is associated with a resource group. When this
- * association is created the pseudo-locked region is initialized. The
- * details of the pseudo-locked region are not known at this time so only
- * allocation is done and association established.
- *
- * Return: 0 on success, <0 on failure
- */
-static int pseudo_lock_init(struct rdtgroup *rdtgrp)
-{
-	struct pseudo_lock_region *plr;
-
-	plr = kzalloc(sizeof(*plr), GFP_KERNEL);
-	if (!plr)
-		return -ENOMEM;
-
-	init_waitqueue_head(&plr->lock_thread_wq);
-	INIT_LIST_HEAD(&plr->pm_reqs);
-	rdtgrp->plr = plr;
-	return 0;
-}
-
-/**
- * pseudo_lock_region_alloc - Allocate kernel memory that will be pseudo-locked
- * @plr: pseudo-lock region
- *
- * Initialize the details required to set up the pseudo-locked region and
- * allocate the contiguous memory that will be pseudo-locked to the cache.
- *
- * Return: 0 on success, <0 on failure.  Descriptive error will be written
- * to last_cmd_status buffer.
- */
-static int pseudo_lock_region_alloc(struct pseudo_lock_region *plr)
-{
-	int ret;
-
-	ret = pseudo_lock_region_init(plr);
-	if (ret < 0)
-		return ret;
-
-	/*
-	 * We do not yet support contiguous regions larger than
-	 * KMALLOC_MAX_SIZE.
-	 */
-	if (plr->size > KMALLOC_MAX_SIZE) {
-		rdt_last_cmd_puts("Requested region exceeds maximum size\n");
-		ret = -E2BIG;
-		goto out_region;
-	}
-
-	plr->kmem = kzalloc(plr->size, GFP_KERNEL);
-	if (!plr->kmem) {
-		rdt_last_cmd_puts("Unable to allocate memory\n");
-		ret = -ENOMEM;
-		goto out_region;
-	}
-
-	ret = 0;
-	goto out;
-out_region:
-	pseudo_lock_region_clear(plr);
-out:
-	return ret;
-}
-
-/**
- * pseudo_lock_free - Free a pseudo-locked region
- * @rdtgrp: resource group to which pseudo-locked region belonged
- *
- * The pseudo-locked region's resources have already been released, or not
- * yet created at this point. Now it can be freed and disassociated from the
- * resource group.
- *
- * Return: void
- */
-static void pseudo_lock_free(struct rdtgroup *rdtgrp)
-{
-	pseudo_lock_region_clear(rdtgrp->plr);
-	kfree(rdtgrp->plr);
-	rdtgrp->plr = NULL;
-}
-
 /**
  * resctrl_arch_pseudo_lock_fn - Load kernel memory into cache
  * @_plr: the pseudo-lock region descriptor
@@ -543,340 +222,6 @@ int resctrl_arch_pseudo_lock_fn(void *_plr)
 	return 0;
 }
 
-/**
- * rdtgroup_monitor_in_progress - Test if monitoring in progress
- * @rdtgrp: resource group being queried
- *
- * Return: 1 if monitor groups have been created for this resource
- * group, 0 otherwise.
- */
-static int rdtgroup_monitor_in_progress(struct rdtgroup *rdtgrp)
-{
-	return !list_empty(&rdtgrp->mon.crdtgrp_list);
-}
-
-/**
- * rdtgroup_locksetup_user_restrict - Restrict user access to group
- * @rdtgrp: resource group needing access restricted
- *
- * A resource group used for cache pseudo-locking cannot have cpus or tasks
- * assigned to it. This is communicated to the user by restricting access
- * to all the files that can be used to make such changes.
- *
- * Permissions restored with rdtgroup_locksetup_user_restore()
- *
- * Return: 0 on success, <0 on failure. If a failure occurs during the
- * restriction of access an attempt will be made to restore permissions but
- * the state of the mode of these files will be uncertain when a failure
- * occurs.
- */
-static int rdtgroup_locksetup_user_restrict(struct rdtgroup *rdtgrp)
-{
-	int ret;
-
-	ret = rdtgroup_kn_mode_restrict(rdtgrp, "tasks");
-	if (ret)
-		return ret;
-
-	ret = rdtgroup_kn_mode_restrict(rdtgrp, "cpus");
-	if (ret)
-		goto err_tasks;
-
-	ret = rdtgroup_kn_mode_restrict(rdtgrp, "cpus_list");
-	if (ret)
-		goto err_cpus;
-
-	if (resctrl_arch_mon_capable()) {
-		ret = rdtgroup_kn_mode_restrict(rdtgrp, "mon_groups");
-		if (ret)
-			goto err_cpus_list;
-	}
-
-	ret = 0;
-	goto out;
-
-err_cpus_list:
-	rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0777);
-err_cpus:
-	rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0777);
-err_tasks:
-	rdtgroup_kn_mode_restore(rdtgrp, "tasks", 0777);
-out:
-	return ret;
-}
-
-/**
- * rdtgroup_locksetup_user_restore - Restore user access to group
- * @rdtgrp: resource group needing access restored
- *
- * Restore all file access previously removed using
- * rdtgroup_locksetup_user_restrict()
- *
- * Return: 0 on success, <0 on failure.  If a failure occurs during the
- * restoration of access an attempt will be made to restrict permissions
- * again but the state of the mode of these files will be uncertain when
- * a failure occurs.
- */
-static int rdtgroup_locksetup_user_restore(struct rdtgroup *rdtgrp)
-{
-	int ret;
-
-	ret = rdtgroup_kn_mode_restore(rdtgrp, "tasks", 0777);
-	if (ret)
-		return ret;
-
-	ret = rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0777);
-	if (ret)
-		goto err_tasks;
-
-	ret = rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0777);
-	if (ret)
-		goto err_cpus;
-
-	if (resctrl_arch_mon_capable()) {
-		ret = rdtgroup_kn_mode_restore(rdtgrp, "mon_groups", 0777);
-		if (ret)
-			goto err_cpus_list;
-	}
-
-	ret = 0;
-	goto out;
-
-err_cpus_list:
-	rdtgroup_kn_mode_restrict(rdtgrp, "cpus_list");
-err_cpus:
-	rdtgroup_kn_mode_restrict(rdtgrp, "cpus");
-err_tasks:
-	rdtgroup_kn_mode_restrict(rdtgrp, "tasks");
-out:
-	return ret;
-}
-
-/**
- * rdtgroup_locksetup_enter - Resource group enters locksetup mode
- * @rdtgrp: resource group requested to enter locksetup mode
- *
- * A resource group enters locksetup mode to reflect that it would be used
- * to represent a pseudo-locked region and is in the process of being set
- * up to do so. A resource group used for a pseudo-locked region would
- * lose the closid associated with it so we cannot allow it to have any
- * tasks or cpus assigned nor permit tasks or cpus to be assigned in the
- * future. Monitoring of a pseudo-locked region is not allowed either.
- *
- * The above and more restrictions on a pseudo-locked region are checked
- * for and enforced before the resource group enters the locksetup mode.
- *
- * Returns: 0 if the resource group successfully entered locksetup mode, <0
- * on failure. On failure the last_cmd_status buffer is updated with text to
- * communicate details of failure to the user.
- */
-int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
-{
-	int ret;
-
-	/*
-	 * The default resource group can neither be removed nor lose the
-	 * default closid associated with it.
-	 */
-	if (rdtgrp == &rdtgroup_default) {
-		rdt_last_cmd_puts("Cannot pseudo-lock default group\n");
-		return -EINVAL;
-	}
-
-	/*
-	 * Cache Pseudo-locking not supported when CDP is enabled.
-	 *
-	 * Some things to consider if you would like to enable this
-	 * support (using L3 CDP as example):
-	 * - When CDP is enabled two separate resources are exposed,
-	 *   L3DATA and L3CODE, but they are actually on the same cache.
-	 *   The implication for pseudo-locking is that if a
-	 *   pseudo-locked region is created on a domain of one
-	 *   resource (eg. L3CODE), then a pseudo-locked region cannot
-	 *   be created on that same domain of the other resource
-	 *   (eg. L3DATA). This is because the creation of a
-	 *   pseudo-locked region involves a call to wbinvd that will
-	 *   affect all cache allocations on particular domain.
-	 * - Considering the previous, it may be possible to only
-	 *   expose one of the CDP resources to pseudo-locking and
-	 *   hide the other. For example, we could consider to only
-	 *   expose L3DATA and since the L3 cache is unified it is
-	 *   still possible to place instructions there are execute it.
-	 * - If only one region is exposed to pseudo-locking we should
-	 *   still keep in mind that availability of a portion of cache
-	 *   for pseudo-locking should take into account both resources.
-	 *   Similarly, if a pseudo-locked region is created in one
-	 *   resource, the portion of cache used by it should be made
-	 *   unavailable to all future allocations from both resources.
-	 */
-	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3) ||
-	    resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2)) {
-		rdt_last_cmd_puts("CDP enabled\n");
-		return -EINVAL;
-	}
-
-	/*
-	 * Not knowing the bits to disable prefetching implies that this
-	 * platform does not support Cache Pseudo-Locking.
-	 */
-	if (resctrl_arch_get_prefetch_disable_bits() == 0) {
-		rdt_last_cmd_puts("Pseudo-locking not supported\n");
-		return -EINVAL;
-	}
-
-	if (rdtgroup_monitor_in_progress(rdtgrp)) {
-		rdt_last_cmd_puts("Monitoring in progress\n");
-		return -EINVAL;
-	}
-
-	if (rdtgroup_tasks_assigned(rdtgrp)) {
-		rdt_last_cmd_puts("Tasks assigned to resource group\n");
-		return -EINVAL;
-	}
-
-	if (!cpumask_empty(&rdtgrp->cpu_mask)) {
-		rdt_last_cmd_puts("CPUs assigned to resource group\n");
-		return -EINVAL;
-	}
-
-	if (rdtgroup_locksetup_user_restrict(rdtgrp)) {
-		rdt_last_cmd_puts("Unable to modify resctrl permissions\n");
-		return -EIO;
-	}
-
-	ret = pseudo_lock_init(rdtgrp);
-	if (ret) {
-		rdt_last_cmd_puts("Unable to init pseudo-lock region\n");
-		goto out_release;
-	}
-
-	/*
-	 * If this system is capable of monitoring a rmid would have been
-	 * allocated when the control group was created. This is not needed
-	 * anymore when this group would be used for pseudo-locking. This
-	 * is safe to call on platforms not capable of monitoring.
-	 */
-	free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
-
-	ret = 0;
-	goto out;
-
-out_release:
-	rdtgroup_locksetup_user_restore(rdtgrp);
-out:
-	return ret;
-}
-
-/**
- * rdtgroup_locksetup_exit - resource group exist locksetup mode
- * @rdtgrp: resource group
- *
- * When a resource group exits locksetup mode the earlier restrictions are
- * lifted.
- *
- * Return: 0 on success, <0 on failure
- */
-int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
-{
-	int ret;
-
-	if (resctrl_arch_mon_capable()) {
-		ret = alloc_rmid(rdtgrp->closid);
-		if (ret < 0) {
-			rdt_last_cmd_puts("Out of RMIDs\n");
-			return ret;
-		}
-		rdtgrp->mon.rmid = ret;
-	}
-
-	ret = rdtgroup_locksetup_user_restore(rdtgrp);
-	if (ret) {
-		free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
-		return ret;
-	}
-
-	pseudo_lock_free(rdtgrp);
-	return 0;
-}
-
-/**
- * rdtgroup_cbm_overlaps_pseudo_locked - Test if CBM or portion is pseudo-locked
- * @d: RDT domain
- * @cbm: CBM to test
- *
- * @d represents a cache instance and @cbm a capacity bitmask that is
- * considered for it. Determine if @cbm overlaps with any existing
- * pseudo-locked region on @d.
- *
- * @cbm is unsigned long, even if only 32 bits are used, to make the
- * bitmap functions work correctly.
- *
- * Return: true if @cbm overlaps with pseudo-locked region on @d, false
- * otherwise.
- */
-bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_ctrl_domain *d, unsigned long cbm)
-{
-	unsigned int cbm_len;
-	unsigned long cbm_b;
-
-	if (d->plr) {
-		cbm_len = d->plr->s->res->cache.cbm_len;
-		cbm_b = d->plr->cbm;
-		if (bitmap_intersects(&cbm, &cbm_b, cbm_len))
-			return true;
-	}
-	return false;
-}
-
-/**
- * rdtgroup_pseudo_locked_in_hierarchy - Pseudo-locked region in cache hierarchy
- * @d: RDT domain under test
- *
- * The setup of a pseudo-locked region affects all cache instances within
- * the hierarchy of the region. It is thus essential to know if any
- * pseudo-locked regions exist within a cache hierarchy to prevent any
- * attempts to create new pseudo-locked regions in the same hierarchy.
- *
- * Return: true if a pseudo-locked region exists in the hierarchy of @d or
- *         if it is not possible to test due to memory allocation issue,
- *         false otherwise.
- */
-bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_ctrl_domain *d)
-{
-	struct rdt_ctrl_domain *d_i;
-	cpumask_var_t cpu_with_psl;
-	struct rdt_resource *r;
-	bool ret = false;
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	if (!zalloc_cpumask_var(&cpu_with_psl, GFP_KERNEL))
-		return true;
-
-	/*
-	 * First determine which cpus have pseudo-locked regions
-	 * associated with them.
-	 */
-	for_each_alloc_capable_rdt_resource(r) {
-		list_for_each_entry(d_i, &r->ctrl_domains, hdr.list) {
-			if (d_i->plr)
-				cpumask_or(cpu_with_psl, cpu_with_psl,
-					   &d_i->hdr.cpu_mask);
-		}
-	}
-
-	/*
-	 * Next test if new pseudo-locked region would intersect with
-	 * existing region.
-	 */
-	if (cpumask_intersects(&d->hdr.cpu_mask, cpu_with_psl))
-		ret = true;
-
-	free_cpumask_var(cpu_with_psl);
-	return ret;
-}
-
 /**
  * resctrl_arch_measure_cycles_lat_fn - Measure cycle latency to read
  *                                      pseudo-locked memory
@@ -1169,434 +514,3 @@ int resctrl_arch_measure_l3_residency(void *_plr)
 	wake_up_interruptible(&plr->lock_thread_wq);
 	return 0;
 }
-
-/**
- * pseudo_lock_measure_cycles - Trigger latency measure to pseudo-locked region
- * @rdtgrp: Resource group to which the pseudo-locked region belongs.
- * @sel: Selector of which measurement to perform on a pseudo-locked region.
- *
- * The measurement of latency to access a pseudo-locked region should be
- * done from a cpu that is associated with that pseudo-locked region.
- * Determine which cpu is associated with this region and start a thread on
- * that cpu to perform the measurement, wait for that thread to complete.
- *
- * Return: 0 on success, <0 on failure
- */
-static int pseudo_lock_measure_cycles(struct rdtgroup *rdtgrp, int sel)
-{
-	struct pseudo_lock_region *plr = rdtgrp->plr;
-	struct task_struct *thread;
-	unsigned int cpu;
-	int ret = -1;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	if (rdtgrp->flags & RDT_DELETED) {
-		ret = -ENODEV;
-		goto out;
-	}
-
-	if (!plr->d) {
-		ret = -ENODEV;
-		goto out;
-	}
-
-	plr->thread_done = 0;
-	cpu = cpumask_first(&plr->d->hdr.cpu_mask);
-	if (!cpu_online(cpu)) {
-		ret = -ENODEV;
-		goto out;
-	}
-
-	plr->cpu = cpu;
-
-	if (sel == 1)
-		thread = kthread_run_on_cpu(resctrl_arch_measure_cycles_lat_fn,
-					    plr, cpu, "pseudo_lock_measure/%u");
-	else if (sel == 2)
-		thread = kthread_run_on_cpu(resctrl_arch_measure_l2_residency,
-					    plr, cpu, "pseudo_lock_measure/%u");
-	else if (sel == 3)
-		thread = kthread_run_on_cpu(resctrl_arch_measure_l3_residency,
-					    plr, cpu, "pseudo_lock_measure/%u");
-	else
-		goto out;
-
-	if (IS_ERR(thread)) {
-		ret = PTR_ERR(thread);
-		goto out;
-	}
-
-	ret = wait_event_interruptible(plr->lock_thread_wq,
-				       plr->thread_done == 1);
-	if (ret < 0)
-		goto out;
-
-	ret = 0;
-
-out:
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-	return ret;
-}
-
-static ssize_t pseudo_lock_measure_trigger(struct file *file,
-					   const char __user *user_buf,
-					   size_t count, loff_t *ppos)
-{
-	struct rdtgroup *rdtgrp = file->private_data;
-	size_t buf_size;
-	char buf[32];
-	int ret;
-	int sel;
-
-	buf_size = min(count, (sizeof(buf) - 1));
-	if (copy_from_user(buf, user_buf, buf_size))
-		return -EFAULT;
-
-	buf[buf_size] = '\0';
-	ret = kstrtoint(buf, 10, &sel);
-	if (ret == 0) {
-		if (sel != 1 && sel != 2 && sel != 3)
-			return -EINVAL;
-		ret = debugfs_file_get(file->f_path.dentry);
-		if (ret)
-			return ret;
-		ret = pseudo_lock_measure_cycles(rdtgrp, sel);
-		if (ret == 0)
-			ret = count;
-		debugfs_file_put(file->f_path.dentry);
-	}
-
-	return ret;
-}
-
-static const struct file_operations pseudo_measure_fops = {
-	.write = pseudo_lock_measure_trigger,
-	.open = simple_open,
-	.llseek = default_llseek,
-};
-
-/**
- * rdtgroup_pseudo_lock_create - Create a pseudo-locked region
- * @rdtgrp: resource group to which pseudo-lock region belongs
- *
- * Called when a resource group in the pseudo-locksetup mode receives a
- * valid schemata that should be pseudo-locked. Since the resource group is
- * in pseudo-locksetup mode the &struct pseudo_lock_region has already been
- * allocated and initialized with the essential information. If a failure
- * occurs the resource group remains in the pseudo-locksetup mode with the
- * &struct pseudo_lock_region associated with it, but cleared from all
- * information and ready for the user to re-attempt pseudo-locking by
- * writing the schemata again.
- *
- * Return: 0 if the pseudo-locked region was successfully pseudo-locked, <0
- * on failure. Descriptive error will be written to last_cmd_status buffer.
- */
-int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
-{
-	struct pseudo_lock_region *plr = rdtgrp->plr;
-	struct task_struct *thread;
-	unsigned int new_minor;
-	struct device *dev;
-	char *kn_name __free(kfree) = NULL;
-	int ret;
-
-	ret = pseudo_lock_region_alloc(plr);
-	if (ret < 0)
-		return ret;
-
-	ret = pseudo_lock_cstates_constrain(plr);
-	if (ret < 0) {
-		ret = -EINVAL;
-		goto out_region;
-	}
-	kn_name = kstrdup(rdt_kn_name(rdtgrp->kn), GFP_KERNEL);
-	if (!kn_name) {
-		ret = -ENOMEM;
-		goto out_cstates;
-	}
-
-	plr->thread_done = 0;
-
-	thread = kthread_run_on_cpu(resctrl_arch_pseudo_lock_fn, plr,
-				    plr->cpu, "pseudo_lock/%u");
-	if (IS_ERR(thread)) {
-		ret = PTR_ERR(thread);
-		rdt_last_cmd_printf("Locking thread returned error %d\n", ret);
-		goto out_cstates;
-	}
-
-	ret = wait_event_interruptible(plr->lock_thread_wq,
-				       plr->thread_done == 1);
-	if (ret < 0) {
-		/*
-		 * If the thread does not get on the CPU for whatever
-		 * reason and the process which sets up the region is
-		 * interrupted then this will leave the thread in runnable
-		 * state and once it gets on the CPU it will dereference
-		 * the cleared, but not freed, plr struct resulting in an
-		 * empty pseudo-locking loop.
-		 */
-		rdt_last_cmd_puts("Locking thread interrupted\n");
-		goto out_cstates;
-	}
-
-	ret = pseudo_lock_minor_get(&new_minor);
-	if (ret < 0) {
-		rdt_last_cmd_puts("Unable to obtain a new minor number\n");
-		goto out_cstates;
-	}
-
-	/*
-	 * Unlock access but do not release the reference. The
-	 * pseudo-locked region will still be here on return.
-	 *
-	 * The mutex has to be released temporarily to avoid a potential
-	 * deadlock with the mm->mmap_lock which is obtained in the
-	 * device_create() and debugfs_create_dir() callpath below as well as
-	 * before the mmap() callback is called.
-	 */
-	mutex_unlock(&rdtgroup_mutex);
-
-	if (!IS_ERR_OR_NULL(debugfs_resctrl)) {
-		plr->debugfs_dir = debugfs_create_dir(kn_name, debugfs_resctrl);
-		if (!IS_ERR_OR_NULL(plr->debugfs_dir))
-			debugfs_create_file("pseudo_lock_measure", 0200,
-					    plr->debugfs_dir, rdtgrp,
-					    &pseudo_measure_fops);
-	}
-
-	dev = device_create(&pseudo_lock_class, NULL,
-			    MKDEV(pseudo_lock_major, new_minor),
-			    rdtgrp, "%s", kn_name);
-
-	mutex_lock(&rdtgroup_mutex);
-
-	if (IS_ERR(dev)) {
-		ret = PTR_ERR(dev);
-		rdt_last_cmd_printf("Failed to create character device: %d\n",
-				    ret);
-		goto out_debugfs;
-	}
-
-	/* We released the mutex - check if group was removed while we did so */
-	if (rdtgrp->flags & RDT_DELETED) {
-		ret = -ENODEV;
-		goto out_device;
-	}
-
-	plr->minor = new_minor;
-
-	rdtgrp->mode = RDT_MODE_PSEUDO_LOCKED;
-	closid_free(rdtgrp->closid);
-	rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0444);
-	rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0444);
-
-	ret = 0;
-	goto out;
-
-out_device:
-	device_destroy(&pseudo_lock_class, MKDEV(pseudo_lock_major, new_minor));
-out_debugfs:
-	debugfs_remove_recursive(plr->debugfs_dir);
-	pseudo_lock_minor_release(new_minor);
-out_cstates:
-	pseudo_lock_cstates_relax(plr);
-out_region:
-	pseudo_lock_region_clear(plr);
-out:
-	return ret;
-}
-
-/**
- * rdtgroup_pseudo_lock_remove - Remove a pseudo-locked region
- * @rdtgrp: resource group to which the pseudo-locked region belongs
- *
- * The removal of a pseudo-locked region can be initiated when the resource
- * group is removed from user space via a "rmdir" from userspace or the
- * unmount of the resctrl filesystem. On removal the resource group does
- * not go back to pseudo-locksetup mode before it is removed, instead it is
- * removed directly. There is thus asymmetry with the creation where the
- * &struct pseudo_lock_region is removed here while it was not created in
- * rdtgroup_pseudo_lock_create().
- *
- * Return: void
- */
-void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp)
-{
-	struct pseudo_lock_region *plr = rdtgrp->plr;
-
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-		/*
-		 * Default group cannot be a pseudo-locked region so we can
-		 * free closid here.
-		 */
-		closid_free(rdtgrp->closid);
-		goto free;
-	}
-
-	pseudo_lock_cstates_relax(plr);
-	debugfs_remove_recursive(rdtgrp->plr->debugfs_dir);
-	device_destroy(&pseudo_lock_class, MKDEV(pseudo_lock_major, plr->minor));
-	pseudo_lock_minor_release(plr->minor);
-
-free:
-	pseudo_lock_free(rdtgrp);
-}
-
-static int pseudo_lock_dev_open(struct inode *inode, struct file *filp)
-{
-	struct rdtgroup *rdtgrp;
-
-	mutex_lock(&rdtgroup_mutex);
-
-	rdtgrp = region_find_by_minor(iminor(inode));
-	if (!rdtgrp) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -ENODEV;
-	}
-
-	filp->private_data = rdtgrp;
-	atomic_inc(&rdtgrp->waitcount);
-	/* Perform a non-seekable open - llseek is not supported */
-	filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
-
-	mutex_unlock(&rdtgroup_mutex);
-
-	return 0;
-}
-
-static int pseudo_lock_dev_release(struct inode *inode, struct file *filp)
-{
-	struct rdtgroup *rdtgrp;
-
-	mutex_lock(&rdtgroup_mutex);
-	rdtgrp = filp->private_data;
-	WARN_ON(!rdtgrp);
-	if (!rdtgrp) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -ENODEV;
-	}
-	filp->private_data = NULL;
-	atomic_dec(&rdtgrp->waitcount);
-	mutex_unlock(&rdtgroup_mutex);
-	return 0;
-}
-
-static int pseudo_lock_dev_mremap(struct vm_area_struct *area)
-{
-	/* Not supported */
-	return -EINVAL;
-}
-
-static const struct vm_operations_struct pseudo_mmap_ops = {
-	.mremap = pseudo_lock_dev_mremap,
-};
-
-static int pseudo_lock_dev_mmap(struct file *filp, struct vm_area_struct *vma)
-{
-	unsigned long vsize = vma->vm_end - vma->vm_start;
-	unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
-	struct pseudo_lock_region *plr;
-	struct rdtgroup *rdtgrp;
-	unsigned long physical;
-	unsigned long psize;
-
-	mutex_lock(&rdtgroup_mutex);
-
-	rdtgrp = filp->private_data;
-	WARN_ON(!rdtgrp);
-	if (!rdtgrp) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -ENODEV;
-	}
-
-	plr = rdtgrp->plr;
-
-	if (!plr->d) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -ENODEV;
-	}
-
-	/*
-	 * Task is required to run with affinity to the cpus associated
-	 * with the pseudo-locked region. If this is not the case the task
-	 * may be scheduled elsewhere and invalidate entries in the
-	 * pseudo-locked region.
-	 */
-	if (!cpumask_subset(current->cpus_ptr, &plr->d->hdr.cpu_mask)) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -EINVAL;
-	}
-
-	physical = __pa(plr->kmem) >> PAGE_SHIFT;
-	psize = plr->size - off;
-
-	if (off > plr->size) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -ENOSPC;
-	}
-
-	/*
-	 * Ensure changes are carried directly to the memory being mapped,
-	 * do not allow copy-on-write mapping.
-	 */
-	if (!(vma->vm_flags & VM_SHARED)) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -EINVAL;
-	}
-
-	if (vsize > psize) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -ENOSPC;
-	}
-
-	memset(plr->kmem + off, 0, vsize);
-
-	if (remap_pfn_range(vma, vma->vm_start, physical + vma->vm_pgoff,
-			    vsize, vma->vm_page_prot)) {
-		mutex_unlock(&rdtgroup_mutex);
-		return -EAGAIN;
-	}
-	vma->vm_ops = &pseudo_mmap_ops;
-	mutex_unlock(&rdtgroup_mutex);
-	return 0;
-}
-
-static const struct file_operations pseudo_lock_dev_fops = {
-	.owner =	THIS_MODULE,
-	.llseek =	no_llseek,
-	.read =		NULL,
-	.write =	NULL,
-	.open =		pseudo_lock_dev_open,
-	.release =	pseudo_lock_dev_release,
-	.mmap =		pseudo_lock_dev_mmap,
-};
-
-int rdt_pseudo_lock_init(void)
-{
-	int ret;
-
-	ret = register_chrdev(0, "pseudo_lock", &pseudo_lock_dev_fops);
-	if (ret < 0)
-		return ret;
-
-	pseudo_lock_major = ret;
-
-	ret = class_register(&pseudo_lock_class);
-	if (ret) {
-		unregister_chrdev(pseudo_lock_major, "pseudo_lock");
-		return ret;
-	}
-
-	return 0;
-}
-
-void rdt_pseudo_lock_release(void)
-{
-	class_unregister(&pseudo_lock_class);
-	unregister_chrdev(pseudo_lock_major, "pseudo_lock");
-	pseudo_lock_major = 0;
-}
diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock_trace.h b/arch/x86/kernel/cpu/resctrl/pseudo_lock_trace.h
index 5a0fae61d3ee..7c8aef08010f 100644
--- a/arch/x86/kernel/cpu/resctrl/pseudo_lock_trace.h
+++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock_trace.h
@@ -39,5 +39,7 @@ TRACE_EVENT(pseudo_lock_l3,
 
 #undef TRACE_INCLUDE_PATH
 #define TRACE_INCLUDE_PATH .
+
 #define TRACE_INCLUDE_FILE pseudo_lock_trace
+
 #include <trace/define_trace.h>
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index ace86b6dcede..c7a7f0ae373a 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -32,4547 +32,230 @@
 #include "internal.h"
 
 DEFINE_STATIC_KEY_FALSE(rdt_enable_key);
-DEFINE_STATIC_KEY_FALSE(rdt_mon_enable_key);
-DEFINE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
-
-/* Mutex to protect rdtgroup access. */
-DEFINE_MUTEX(rdtgroup_mutex);
-
-static struct kernfs_root *rdt_root;
-struct rdtgroup rdtgroup_default;
-LIST_HEAD(rdt_all_groups);
-
-/* list of entries for the schemata file */
-LIST_HEAD(resctrl_schema_all);
-
-/*
- * List of struct mon_data containing private data of event files for use by
- * rdtgroup_mondata_show(). Protected by rdtgroup_mutex.
- */
-static LIST_HEAD(mon_data_kn_priv_list);
-
-/* The filesystem can only be mounted once. */
-bool resctrl_mounted;
-
-/* Kernel fs node for "info" directory under root */
-static struct kernfs_node *kn_info;
-
-/* Kernel fs node for "mon_groups" directory under root */
-static struct kernfs_node *kn_mongrp;
-
-/* Kernel fs node for "mon_data" directory under root */
-static struct kernfs_node *kn_mondata;
-
-/*
- * Used to store the max resource name width to display the schemata names in
- * a tabular format.
- */
-int max_name_width;
-
-static struct seq_buf last_cmd_status;
-static char last_cmd_status_buf[512];
 
-static int rdtgroup_setup_root(struct rdt_fs_context *ctx);
-static void rdtgroup_destroy_root(void);
+DEFINE_STATIC_KEY_FALSE(rdt_mon_enable_key);
 
-struct dentry *debugfs_resctrl;
+DEFINE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
 
 /*
- * Memory bandwidth monitoring event to use for the default CTRL_MON group
- * and each new CTRL_MON group created by the user.  Only relevant when
- * the filesystem is mounted with the "mba_MBps" option so it does not
- * matter that it remains uninitialized on systems that do not support
- * the "mba_MBps" option.
+ * This is safe against resctrl_arch_sched_in() called from __switch_to()
+ * because __switch_to() is executed with interrupts disabled. A local call
+ * from update_closid_rmid() is protected against __switch_to() because
+ * preemption is disabled.
  */
-enum resctrl_event_id mba_mbps_default_event;
-
-static bool resctrl_debug;
-
-void rdt_last_cmd_clear(void)
-{
-	lockdep_assert_held(&rdtgroup_mutex);
-	seq_buf_clear(&last_cmd_status);
-}
-
-void rdt_last_cmd_puts(const char *s)
-{
-	lockdep_assert_held(&rdtgroup_mutex);
-	seq_buf_puts(&last_cmd_status, s);
-}
-
-void rdt_last_cmd_printf(const char *fmt, ...)
-{
-	va_list ap;
-
-	va_start(ap, fmt);
-	lockdep_assert_held(&rdtgroup_mutex);
-	seq_buf_vprintf(&last_cmd_status, fmt, ap);
-	va_end(ap);
-}
-
-void rdt_staged_configs_clear(void)
+void resctrl_arch_sync_cpu_closid_rmid(void *info)
 {
-	struct rdt_ctrl_domain *dom;
-	struct rdt_resource *r;
-
-	lockdep_assert_held(&rdtgroup_mutex);
+	struct resctrl_cpu_defaults *r = info;
 
-	for_each_alloc_capable_rdt_resource(r) {
-		list_for_each_entry(dom, &r->ctrl_domains, hdr.list)
-			memset(dom->staged_config, 0, sizeof(dom->staged_config));
+	if (r) {
+		this_cpu_write(pqr_state.default_closid, r->closid);
+		this_cpu_write(pqr_state.default_rmid, r->rmid);
 	}
-}
 
-static bool resctrl_is_mbm_enabled(void)
-{
-	return (resctrl_arch_is_mbm_total_enabled() ||
-		resctrl_arch_is_mbm_local_enabled());
+	/*
+	 * We cannot unconditionally write the MSR because the current
+	 * executing task might have its own closid selected. Just reuse
+	 * the context switch code.
+	 */
+	resctrl_arch_sched_in(current);
 }
 
-static bool resctrl_is_mbm_event(int e)
-{
-	return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
-		e <= QOS_L3_MBM_LOCAL_EVENT_ID);
-}
+#define INVALID_CONFIG_INDEX   UINT_MAX
 
-/*
- * Trivial allocator for CLOSIDs. Use BITMAP APIs to manipulate a bitmap
- * of free CLOSIDs.
+/**
+ * mon_event_config_index_get - get the hardware index for the
+ *                              configurable event
+ * @evtid: event id.
  *
- * Using a global CLOSID across all resources has some advantages and
- * some drawbacks:
- * + We can simply set current's closid to assign a task to a resource
- *   group.
- * + Context switch code can avoid extra memory references deciding which
- *   CLOSID to load into the PQR_ASSOC MSR
- * - We give up some options in configuring resource groups across multi-socket
- *   systems.
- * - Our choices on how to configure each resource become progressively more
- *   limited as the number of resources grows.
+ * Return: 0 for evtid == QOS_L3_MBM_TOTAL_EVENT_ID
+ *         1 for evtid == QOS_L3_MBM_LOCAL_EVENT_ID
+ *         INVALID_CONFIG_INDEX for invalid evtid
  */
-static unsigned long *closid_free_map;
-static int closid_free_map_len;
-
-int closids_supported(void)
-{
-	return closid_free_map_len;
-}
-
-static int closid_init(void)
+static inline unsigned int mon_event_config_index_get(u32 evtid)
 {
-	struct resctrl_schema *s;
-	u32 rdt_min_closid = ~0;
-
-	/* Monitor only platforms still call closid_init() */
-	if (list_empty(&resctrl_schema_all))
+	switch (evtid) {
+	case QOS_L3_MBM_TOTAL_EVENT_ID:
 		return 0;
-
-	/* Compute rdt_min_closid across all resources */
-	list_for_each_entry(s, &resctrl_schema_all, list)
-		rdt_min_closid = min(rdt_min_closid, s->num_closid);
-
-	closid_free_map = bitmap_alloc(rdt_min_closid, GFP_KERNEL);
-	if (!closid_free_map)
-		return -ENOMEM;
-	bitmap_fill(closid_free_map, rdt_min_closid);
-
-	/* RESCTRL_RESERVED_CLOSID is always reserved for the default group */
-	__clear_bit(RESCTRL_RESERVED_CLOSID, closid_free_map);
-	closid_free_map_len = rdt_min_closid;
-
-	return 0;
-}
-
-static void closid_exit(void)
-{
-	bitmap_free(closid_free_map);
-	closid_free_map = NULL;
+	case QOS_L3_MBM_LOCAL_EVENT_ID:
+		return 1;
+	default:
+		/* Should never reach here */
+		return INVALID_CONFIG_INDEX;
+	}
 }
 
-static int closid_alloc(void)
+void resctrl_arch_mon_event_config_read(void *_config_info)
 {
-	int cleanest_closid;
-	u32 closid;
-
-	lockdep_assert_held(&rdtgroup_mutex);
+	struct resctrl_mon_config_info *config_info = _config_info;
+	unsigned int index;
+	u64 msrval;
 
-	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID) &&
-	    resctrl_arch_is_llc_occupancy_enabled()) {
-		cleanest_closid = resctrl_find_cleanest_closid();
-		if (cleanest_closid < 0)
-			return cleanest_closid;
-		closid = cleanest_closid;
-	} else {
-		closid = find_first_bit(closid_free_map, closid_free_map_len);
-		if (closid == closid_free_map_len)
-			return -ENOSPC;
+	index = mon_event_config_index_get(config_info->evtid);
+	if (index == INVALID_CONFIG_INDEX) {
+		pr_warn_once("Invalid event id %d\n", config_info->evtid);
+		return;
 	}
-	__clear_bit(closid, closid_free_map);
-
-	return closid;
-}
-
-void closid_free(int closid)
-{
-	lockdep_assert_held(&rdtgroup_mutex);
+	rdmsrl(MSR_IA32_EVT_CFG_BASE + index, msrval);
 
-	__set_bit(closid, closid_free_map);
+	/* Report only the valid event configuration bits */
+	config_info->mon_config = msrval & MAX_EVT_CONFIG_BITS;
 }
 
-/**
- * closid_allocated - test if provided closid is in use
- * @closid: closid to be tested
- *
- * Return: true if @closid is currently associated with a resource group,
- * false if @closid is free
- */
-bool closid_allocated(unsigned int closid)
+void resctrl_arch_mon_event_config_write(void *_config_info)
 {
-	lockdep_assert_held(&rdtgroup_mutex);
+	struct resctrl_mon_config_info *config_info = _config_info;
+	unsigned int index;
 
-	return !test_bit(closid, closid_free_map);
+	index = mon_event_config_index_get(config_info->evtid);
+	if (index == INVALID_CONFIG_INDEX) {
+		pr_warn_once("Invalid event id %d\n", config_info->evtid);
+		return;
+	}
+	wrmsr(MSR_IA32_EVT_CFG_BASE + index, config_info->mon_config, 0);
 }
 
-/**
- * rdtgroup_mode_by_closid - Return mode of resource group with closid
- * @closid: closid if the resource group
- *
- * Each resource group is associated with a @closid. Here the mode
- * of a resource group can be queried by searching for it using its closid.
- *
- * Return: mode as &enum rdtgrp_mode of resource group with closid @closid
- */
-enum rdtgrp_mode rdtgroup_mode_by_closid(int closid)
+static void l3_qos_cfg_update(void *arg)
 {
-	struct rdtgroup *rdtgrp;
-
-	list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
-		if (rdtgrp->closid == closid)
-			return rdtgrp->mode;
-	}
+	bool *enable = arg;
 
-	return RDT_NUM_MODES;
+	wrmsrl(MSR_IA32_L3_QOS_CFG, *enable ? L3_QOS_CDP_ENABLE : 0ULL);
 }
 
-static const char * const rdt_mode_str[] = {
-	[RDT_MODE_SHAREABLE]		= "shareable",
-	[RDT_MODE_EXCLUSIVE]		= "exclusive",
-	[RDT_MODE_PSEUDO_LOCKSETUP]	= "pseudo-locksetup",
-	[RDT_MODE_PSEUDO_LOCKED]	= "pseudo-locked",
-};
-
-/**
- * rdtgroup_mode_str - Return the string representation of mode
- * @mode: the resource group mode as &enum rdtgroup_mode
- *
- * Return: string representation of valid mode, "unknown" otherwise
- */
-static const char *rdtgroup_mode_str(enum rdtgrp_mode mode)
+static void l2_qos_cfg_update(void *arg)
 {
-	if (mode < RDT_MODE_SHAREABLE || mode >= RDT_NUM_MODES)
-		return "unknown";
+	bool *enable = arg;
 
-	return rdt_mode_str[mode];
+	wrmsrl(MSR_IA32_L2_QOS_CFG, *enable ? L2_QOS_CDP_ENABLE : 0ULL);
 }
 
-/* set uid and gid of rdtgroup dirs and files to that of the creator */
-static int rdtgroup_kn_set_ugid(struct kernfs_node *kn)
+static int set_cache_qos_cfg(int level, bool enable)
 {
-	struct iattr iattr = { .ia_valid = ATTR_UID | ATTR_GID,
-				.ia_uid = current_fsuid(),
-				.ia_gid = current_fsgid(), };
-
-	if (uid_eq(iattr.ia_uid, GLOBAL_ROOT_UID) &&
-	    gid_eq(iattr.ia_gid, GLOBAL_ROOT_GID))
-		return 0;
+	void (*update)(void *arg);
+	struct rdt_ctrl_domain *d;
+	struct rdt_resource *r_l;
+	cpumask_var_t cpu_mask;
+	int cpu;
 
-	return kernfs_setattr(kn, &iattr);
-}
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
 
-static int rdtgroup_add_file(struct kernfs_node *parent_kn, struct rftype *rft)
-{
-	struct kernfs_node *kn;
-	int ret;
+	if (level == RDT_RESOURCE_L3)
+		update = l3_qos_cfg_update;
+	else if (level == RDT_RESOURCE_L2)
+		update = l2_qos_cfg_update;
+	else
+		return -EINVAL;
 
-	kn = __kernfs_create_file(parent_kn, rft->name, rft->mode,
-				  GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
-				  0, rft->kf_ops, rft, NULL, NULL);
-	if (IS_ERR(kn))
-		return PTR_ERR(kn);
+	if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
+		return -ENOMEM;
 
-	ret = rdtgroup_kn_set_ugid(kn);
-	if (ret) {
-		kernfs_remove(kn);
-		return ret;
+	r_l = &rdt_resources_all[level].r_resctrl;
+	list_for_each_entry(d, &r_l->ctrl_domains, hdr.list) {
+		if (r_l->cache.arch_has_per_cpu_cfg)
+			/* Pick all the CPUs in the domain instance */
+			for_each_cpu(cpu, &d->hdr.cpu_mask)
+				cpumask_set_cpu(cpu, cpu_mask);
+		else
+			/* Pick one CPU from each domain instance to update MSR */
+			cpumask_set_cpu(cpumask_any(&d->hdr.cpu_mask), cpu_mask);
 	}
 
-	return 0;
-}
+	/* Update QOS_CFG MSR on all the CPUs in cpu_mask */
+	on_each_cpu_mask(cpu_mask, update, &enable, 1);
 
-static int rdtgroup_seqfile_show(struct seq_file *m, void *arg)
-{
-	struct kernfs_open_file *of = m->private;
-	struct rftype *rft = of->kn->priv;
+	free_cpumask_var(cpu_mask);
 
-	if (rft->seq_show)
-		return rft->seq_show(of, m, arg);
 	return 0;
 }
 
-static ssize_t rdtgroup_file_write(struct kernfs_open_file *of, char *buf,
-				   size_t nbytes, loff_t off)
+/* Restore the qos cfg state when a domain comes online */
+void rdt_domain_reconfigure_cdp(struct rdt_resource *r)
 {
-	struct rftype *rft = of->kn->priv;
-
-	if (rft->write)
-		return rft->write(of, buf, nbytes, off);
-
-	return -EINVAL;
-}
-
-static const struct kernfs_ops rdtgroup_kf_single_ops = {
-	.atomic_write_len	= PAGE_SIZE,
-	.write			= rdtgroup_file_write,
-	.seq_show		= rdtgroup_seqfile_show,
-};
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
-static const struct kernfs_ops kf_mondata_ops = {
-	.atomic_write_len	= PAGE_SIZE,
-	.seq_show		= rdtgroup_mondata_show,
-};
+	if (!r->cdp_capable)
+		return;
 
-static bool is_cpu_list(struct kernfs_open_file *of)
-{
-	struct rftype *rft = of->kn->priv;
+	if (r->rid == RDT_RESOURCE_L2)
+		l2_qos_cfg_update(&hw_res->cdp_enabled);
 
-	return rft->flags & RFTYPE_FLAGS_CPUS_LIST;
+	if (r->rid == RDT_RESOURCE_L3)
+		l3_qos_cfg_update(&hw_res->cdp_enabled);
 }
 
-static int rdtgroup_cpus_show(struct kernfs_open_file *of,
-			      struct seq_file *s, void *v)
+static int cdp_enable(int level)
 {
-	struct rdtgroup *rdtgrp;
-	struct cpumask *mask;
-	int ret = 0;
+	struct rdt_resource *r_l = &rdt_resources_all[level].r_resctrl;
+	int ret;
 
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!r_l->alloc_capable)
+		return -EINVAL;
 
-	if (rdtgrp) {
-		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
-			if (!rdtgrp->plr->d) {
-				rdt_last_cmd_clear();
-				rdt_last_cmd_puts("Cache domain offline\n");
-				ret = -ENODEV;
-			} else {
-				mask = &rdtgrp->plr->d->hdr.cpu_mask;
-				seq_printf(s, is_cpu_list(of) ?
-					   "%*pbl\n" : "%*pb\n",
-					   cpumask_pr_args(mask));
-			}
-		} else {
-			seq_printf(s, is_cpu_list(of) ? "%*pbl\n" : "%*pb\n",
-				   cpumask_pr_args(&rdtgrp->cpu_mask));
-		}
-	} else {
-		ret = -ENOENT;
-	}
-	rdtgroup_kn_unlock(of->kn);
+	ret = set_cache_qos_cfg(level, true);
+	if (!ret)
+		rdt_resources_all[level].cdp_enabled = true;
 
 	return ret;
 }
 
-/*
- * This is safe against resctrl_arch_sched_in() called from __switch_to()
- * because __switch_to() is executed with interrupts disabled. A local call
- * from update_closid_rmid() is protected against __switch_to() because
- * preemption is disabled.
- */
-void resctrl_arch_sync_cpu_closid_rmid(void *info)
-{
-	struct resctrl_cpu_defaults *r = info;
-
-	if (r) {
-		this_cpu_write(pqr_state.default_closid, r->closid);
-		this_cpu_write(pqr_state.default_rmid, r->rmid);
-	}
-
-	/*
-	 * We cannot unconditionally write the MSR because the current
-	 * executing task might have its own closid selected. Just reuse
-	 * the context switch code.
-	 */
-	resctrl_arch_sched_in(current);
-}
-
-/*
- * Update the PGR_ASSOC MSR on all cpus in @cpu_mask,
- *
- * Per task closids/rmids must have been set up before calling this function.
- * @r may be NULL.
- */
-static void
-update_closid_rmid(const struct cpumask *cpu_mask, struct rdtgroup *r)
+static void cdp_disable(int level)
 {
-	struct resctrl_cpu_defaults defaults, *p = NULL;
+	struct rdt_hw_resource *r_hw = &rdt_resources_all[level];
 
-	if (r) {
-		defaults.closid = r->closid;
-		defaults.rmid = r->mon.rmid;
-		p = &defaults;
+	if (r_hw->cdp_enabled) {
+		set_cache_qos_cfg(level, false);
+		r_hw->cdp_enabled = false;
 	}
-
-	on_each_cpu_mask(cpu_mask, resctrl_arch_sync_cpu_closid_rmid, p, 1);
 }
 
-static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
-			  cpumask_var_t tmpmask)
+int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable)
 {
-	struct rdtgroup *prgrp = rdtgrp->mon.parent, *crgrp;
-	struct list_head *head;
+	struct rdt_hw_resource *hw_res = &rdt_resources_all[l];
 
-	/* Check whether cpus belong to parent ctrl group */
-	cpumask_andnot(tmpmask, newmask, &prgrp->cpu_mask);
-	if (!cpumask_empty(tmpmask)) {
-		rdt_last_cmd_puts("Can only add CPUs to mongroup that belong to parent\n");
+	if (!hw_res->r_resctrl.cdp_capable)
 		return -EINVAL;
-	}
-
-	/* Check whether cpus are dropped from this group */
-	cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
-	if (!cpumask_empty(tmpmask)) {
-		/* Give any dropped cpus to parent rdtgroup */
-		cpumask_or(&prgrp->cpu_mask, &prgrp->cpu_mask, tmpmask);
-		update_closid_rmid(tmpmask, prgrp);
-	}
 
-	/*
-	 * If we added cpus, remove them from previous group that owned them
-	 * and update per-cpu rmid
-	 */
-	cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask);
-	if (!cpumask_empty(tmpmask)) {
-		head = &prgrp->mon.crdtgrp_list;
-		list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
-			if (crgrp == rdtgrp)
-				continue;
-			cpumask_andnot(&crgrp->cpu_mask, &crgrp->cpu_mask,
-				       tmpmask);
-		}
-		update_closid_rmid(tmpmask, rdtgrp);
-	}
+	if (enable)
+		return cdp_enable(l);
 
-	/* Done pushing/pulling - update this group with new mask */
-	cpumask_copy(&rdtgrp->cpu_mask, newmask);
+	cdp_disable(l);
 
 	return 0;
 }
 
-static void cpumask_rdtgrp_clear(struct rdtgroup *r, struct cpumask *m)
+bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l)
 {
-	struct rdtgroup *crgrp;
-
-	cpumask_andnot(&r->cpu_mask, &r->cpu_mask, m);
-	/* update the child mon group masks as well*/
-	list_for_each_entry(crgrp, &r->mon.crdtgrp_list, mon.crdtgrp_list)
-		cpumask_and(&crgrp->cpu_mask, &r->cpu_mask, &crgrp->cpu_mask);
+	return rdt_resources_all[l].cdp_enabled;
 }
 
-static int cpus_ctrl_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
-			   cpumask_var_t tmpmask, cpumask_var_t tmpmask1)
+void resctrl_arch_reset_all_ctrls(struct rdt_resource *r)
 {
-	struct rdtgroup *r, *crgrp;
-	struct list_head *head;
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
+	struct rdt_hw_ctrl_domain *hw_dom;
+	struct msr_param msr_param;
+	struct rdt_ctrl_domain *d;
+	int i;
 
-	/* Check whether cpus are dropped from this group */
-	cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
-	if (!cpumask_empty(tmpmask)) {
-		/* Can't drop from default group */
-		if (rdtgrp == &rdtgroup_default) {
-			rdt_last_cmd_puts("Can't drop CPUs from default group\n");
-			return -EINVAL;
-		}
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
 
-		/* Give any dropped cpus to rdtgroup_default */
-		cpumask_or(&rdtgroup_default.cpu_mask,
-			   &rdtgroup_default.cpu_mask, tmpmask);
-		update_closid_rmid(tmpmask, &rdtgroup_default);
-	}
+	msr_param.res = r;
+	msr_param.low = 0;
+	msr_param.high = hw_res->num_closid;
 
 	/*
-	 * If we added cpus, remove them from previous group and
-	 * the prev group's child groups that owned them
-	 * and update per-cpu closid/rmid.
+	 * Disable resource control for this resource by setting all
+	 * CBMs in all ctrl_domains to the maximum mask value. Pick one CPU
+	 * from each domain to update the MSRs below.
 	 */
-	cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask);
-	if (!cpumask_empty(tmpmask)) {
-		list_for_each_entry(r, &rdt_all_groups, rdtgroup_list) {
-			if (r == rdtgrp)
-				continue;
-			cpumask_and(tmpmask1, &r->cpu_mask, tmpmask);
-			if (!cpumask_empty(tmpmask1))
-				cpumask_rdtgrp_clear(r, tmpmask1);
-		}
-		update_closid_rmid(tmpmask, rdtgrp);
-	}
+	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
+		hw_dom = resctrl_to_arch_ctrl_dom(d);
 
-	/* Done pushing/pulling - update this group with new mask */
-	cpumask_copy(&rdtgrp->cpu_mask, newmask);
+		for (i = 0; i < hw_res->num_closid; i++)
+			hw_dom->ctrl_val[i] = resctrl_get_default_ctrl(r);
+		msr_param.dom = d;
+		smp_call_function_any(&d->hdr.cpu_mask, rdt_ctrl_update, &msr_param, 1);
+	}
 
-	/*
-	 * Clear child mon group masks since there is a new parent mask
-	 * now and update the rmid for the cpus the child lost.
-	 */
-	head = &rdtgrp->mon.crdtgrp_list;
-	list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
-		cpumask_and(tmpmask, &rdtgrp->cpu_mask, &crgrp->cpu_mask);
-		update_closid_rmid(tmpmask, rdtgrp);
-		cpumask_clear(&crgrp->cpu_mask);
-	}
-
-	return 0;
-}
-
-static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of,
-				   char *buf, size_t nbytes, loff_t off)
-{
-	cpumask_var_t tmpmask, newmask, tmpmask1;
-	struct rdtgroup *rdtgrp;
-	int ret;
-
-	if (!buf)
-		return -EINVAL;
-
-	if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL))
-		return -ENOMEM;
-	if (!zalloc_cpumask_var(&newmask, GFP_KERNEL)) {
-		free_cpumask_var(tmpmask);
-		return -ENOMEM;
-	}
-	if (!zalloc_cpumask_var(&tmpmask1, GFP_KERNEL)) {
-		free_cpumask_var(tmpmask);
-		free_cpumask_var(newmask);
-		return -ENOMEM;
-	}
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (!rdtgrp) {
-		ret = -ENOENT;
-		goto unlock;
-	}
-
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED ||
-	    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-		ret = -EINVAL;
-		rdt_last_cmd_puts("Pseudo-locking in progress\n");
-		goto unlock;
-	}
-
-	if (is_cpu_list(of))
-		ret = cpulist_parse(buf, newmask);
-	else
-		ret = cpumask_parse(buf, newmask);
-
-	if (ret) {
-		rdt_last_cmd_puts("Bad CPU list/mask\n");
-		goto unlock;
-	}
-
-	/* check that user didn't specify any offline cpus */
-	cpumask_andnot(tmpmask, newmask, cpu_online_mask);
-	if (!cpumask_empty(tmpmask)) {
-		ret = -EINVAL;
-		rdt_last_cmd_puts("Can only assign online CPUs\n");
-		goto unlock;
-	}
-
-	if (rdtgrp->type == RDTCTRL_GROUP)
-		ret = cpus_ctrl_write(rdtgrp, newmask, tmpmask, tmpmask1);
-	else if (rdtgrp->type == RDTMON_GROUP)
-		ret = cpus_mon_write(rdtgrp, newmask, tmpmask);
-	else
-		ret = -EINVAL;
-
-unlock:
-	rdtgroup_kn_unlock(of->kn);
-	free_cpumask_var(tmpmask);
-	free_cpumask_var(newmask);
-	free_cpumask_var(tmpmask1);
-
-	return ret ?: nbytes;
-}
-
-/**
- * rdtgroup_remove - the helper to remove resource group safely
- * @rdtgrp: resource group to remove
- *
- * On resource group creation via a mkdir, an extra kernfs_node reference is
- * taken to ensure that the rdtgroup structure remains accessible for the
- * rdtgroup_kn_unlock() calls where it is removed.
- *
- * Drop the extra reference here, then free the rdtgroup structure.
- *
- * Return: void
- */
-static void rdtgroup_remove(struct rdtgroup *rdtgrp)
-{
-	kernfs_put(rdtgrp->kn);
-	kfree(rdtgrp);
-}
-
-static void _update_task_closid_rmid(void *task)
-{
-	/*
-	 * If the task is still current on this CPU, update PQR_ASSOC MSR.
-	 * Otherwise, the MSR is updated when the task is scheduled in.
-	 */
-	if (task == current)
-		resctrl_arch_sched_in(task);
-}
-
-static void update_task_closid_rmid(struct task_struct *t)
-{
-	if (IS_ENABLED(CONFIG_SMP) && task_curr(t))
-		smp_call_function_single(task_cpu(t), _update_task_closid_rmid, t, 1);
-	else
-		_update_task_closid_rmid(t);
-}
-
-static bool task_in_rdtgroup(struct task_struct *tsk, struct rdtgroup *rdtgrp)
-{
-	u32 closid, rmid = rdtgrp->mon.rmid;
-
-	if (rdtgrp->type == RDTCTRL_GROUP)
-		closid = rdtgrp->closid;
-	else if (rdtgrp->type == RDTMON_GROUP)
-		closid = rdtgrp->mon.parent->closid;
-	else
-		return false;
-
-	return resctrl_arch_match_closid(tsk, closid) &&
-	       resctrl_arch_match_rmid(tsk, closid, rmid);
-}
-
-static int __rdtgroup_move_task(struct task_struct *tsk,
-				struct rdtgroup *rdtgrp)
-{
-	/* If the task is already in rdtgrp, no need to move the task. */
-	if (task_in_rdtgroup(tsk, rdtgrp))
-		return 0;
-
-	/*
-	 * Set the task's closid/rmid before the PQR_ASSOC MSR can be
-	 * updated by them.
-	 *
-	 * For ctrl_mon groups, move both closid and rmid.
-	 * For monitor groups, can move the tasks only from
-	 * their parent CTRL group.
-	 */
-	if (rdtgrp->type == RDTMON_GROUP &&
-	    !resctrl_arch_match_closid(tsk, rdtgrp->mon.parent->closid)) {
-		rdt_last_cmd_puts("Can't move task to different control group\n");
-		return -EINVAL;
-	}
-
-	if (rdtgrp->type == RDTMON_GROUP)
-		resctrl_arch_set_closid_rmid(tsk, rdtgrp->mon.parent->closid,
-					     rdtgrp->mon.rmid);
-	else
-		resctrl_arch_set_closid_rmid(tsk, rdtgrp->closid,
-					     rdtgrp->mon.rmid);
-
-	/*
-	 * Ensure the task's closid and rmid are written before determining if
-	 * the task is current that will decide if it will be interrupted.
-	 * This pairs with the full barrier between the rq->curr update and
-	 * resctrl_arch_sched_in() during context switch.
-	 */
-	smp_mb();
-
-	/*
-	 * By now, the task's closid and rmid are set. If the task is current
-	 * on a CPU, the PQR_ASSOC MSR needs to be updated to make the resource
-	 * group go into effect. If the task is not current, the MSR will be
-	 * updated when the task is scheduled in.
-	 */
-	update_task_closid_rmid(tsk);
-
-	return 0;
-}
-
-static bool is_closid_match(struct task_struct *t, struct rdtgroup *r)
-{
-	return (resctrl_arch_alloc_capable() && (r->type == RDTCTRL_GROUP) &&
-		resctrl_arch_match_closid(t, r->closid));
-}
-
-static bool is_rmid_match(struct task_struct *t, struct rdtgroup *r)
-{
-	return (resctrl_arch_mon_capable() && (r->type == RDTMON_GROUP) &&
-		resctrl_arch_match_rmid(t, r->mon.parent->closid,
-					r->mon.rmid));
-}
-
-/**
- * rdtgroup_tasks_assigned - Test if tasks have been assigned to resource group
- * @r: Resource group
- *
- * Return: 1 if tasks have been assigned to @r, 0 otherwise
- */
-int rdtgroup_tasks_assigned(struct rdtgroup *r)
-{
-	struct task_struct *p, *t;
-	int ret = 0;
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	rcu_read_lock();
-	for_each_process_thread(p, t) {
-		if (is_closid_match(t, r) || is_rmid_match(t, r)) {
-			ret = 1;
-			break;
-		}
-	}
-	rcu_read_unlock();
-
-	return ret;
-}
-
-static int rdtgroup_task_write_permission(struct task_struct *task,
-					  struct kernfs_open_file *of)
-{
-	const struct cred *tcred = get_task_cred(task);
-	const struct cred *cred = current_cred();
-	int ret = 0;
-
-	/*
-	 * Even if we're attaching all tasks in the thread group, we only
-	 * need to check permissions on one of them.
-	 */
-	if (!uid_eq(cred->euid, GLOBAL_ROOT_UID) &&
-	    !uid_eq(cred->euid, tcred->uid) &&
-	    !uid_eq(cred->euid, tcred->suid)) {
-		rdt_last_cmd_printf("No permission to move task %d\n", task->pid);
-		ret = -EPERM;
-	}
-
-	put_cred(tcred);
-	return ret;
-}
-
-static int rdtgroup_move_task(pid_t pid, struct rdtgroup *rdtgrp,
-			      struct kernfs_open_file *of)
-{
-	struct task_struct *tsk;
-	int ret;
-
-	rcu_read_lock();
-	if (pid) {
-		tsk = find_task_by_vpid(pid);
-		if (!tsk) {
-			rcu_read_unlock();
-			rdt_last_cmd_printf("No task %d\n", pid);
-			return -ESRCH;
-		}
-	} else {
-		tsk = current;
-	}
-
-	get_task_struct(tsk);
-	rcu_read_unlock();
-
-	ret = rdtgroup_task_write_permission(tsk, of);
-	if (!ret)
-		ret = __rdtgroup_move_task(tsk, rdtgrp);
-
-	put_task_struct(tsk);
-	return ret;
-}
-
-static ssize_t rdtgroup_tasks_write(struct kernfs_open_file *of,
-				    char *buf, size_t nbytes, loff_t off)
-{
-	struct rdtgroup *rdtgrp;
-	char *pid_str;
-	int ret = 0;
-	pid_t pid;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (!rdtgrp) {
-		rdtgroup_kn_unlock(of->kn);
-		return -ENOENT;
-	}
-	rdt_last_cmd_clear();
-
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED ||
-	    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-		ret = -EINVAL;
-		rdt_last_cmd_puts("Pseudo-locking in progress\n");
-		goto unlock;
-	}
-
-	while (buf && buf[0] != '\0' && buf[0] != '\n') {
-		pid_str = strim(strsep(&buf, ","));
-
-		if (kstrtoint(pid_str, 0, &pid)) {
-			rdt_last_cmd_printf("Task list parsing error pid %s\n", pid_str);
-			ret = -EINVAL;
-			break;
-		}
-
-		if (pid < 0) {
-			rdt_last_cmd_printf("Invalid pid %d\n", pid);
-			ret = -EINVAL;
-			break;
-		}
-
-		ret = rdtgroup_move_task(pid, rdtgrp, of);
-		if (ret) {
-			rdt_last_cmd_printf("Error while processing task %d\n", pid);
-			break;
-		}
-	}
-
-unlock:
-	rdtgroup_kn_unlock(of->kn);
-
-	return ret ?: nbytes;
-}
-
-static void show_rdt_tasks(struct rdtgroup *r, struct seq_file *s)
-{
-	struct task_struct *p, *t;
-	pid_t pid;
-
-	rcu_read_lock();
-	for_each_process_thread(p, t) {
-		if (is_closid_match(t, r) || is_rmid_match(t, r)) {
-			pid = task_pid_vnr(t);
-			if (pid)
-				seq_printf(s, "%d\n", pid);
-		}
-	}
-	rcu_read_unlock();
-}
-
-static int rdtgroup_tasks_show(struct kernfs_open_file *of,
-			       struct seq_file *s, void *v)
-{
-	struct rdtgroup *rdtgrp;
-	int ret = 0;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (rdtgrp)
-		show_rdt_tasks(rdtgrp, s);
-	else
-		ret = -ENOENT;
-	rdtgroup_kn_unlock(of->kn);
-
-	return ret;
-}
-
-static int rdtgroup_closid_show(struct kernfs_open_file *of,
-				struct seq_file *s, void *v)
-{
-	struct rdtgroup *rdtgrp;
-	int ret = 0;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (rdtgrp)
-		seq_printf(s, "%u\n", rdtgrp->closid);
-	else
-		ret = -ENOENT;
-	rdtgroup_kn_unlock(of->kn);
-
-	return ret;
-}
-
-static int rdtgroup_rmid_show(struct kernfs_open_file *of,
-			      struct seq_file *s, void *v)
-{
-	struct rdtgroup *rdtgrp;
-	int ret = 0;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (rdtgrp)
-		seq_printf(s, "%u\n", rdtgrp->mon.rmid);
-	else
-		ret = -ENOENT;
-	rdtgroup_kn_unlock(of->kn);
-
-	return ret;
-}
-
-#ifdef CONFIG_PROC_CPU_RESCTRL
-
-/*
- * A task can only be part of one resctrl control group and of one monitor
- * group which is associated to that control group.
- *
- * 1)   res:
- *      mon:
- *
- *    resctrl is not available.
- *
- * 2)   res:/
- *      mon:
- *
- *    Task is part of the root resctrl control group, and it is not associated
- *    to any monitor group.
- *
- * 3)  res:/
- *     mon:mon0
- *
- *    Task is part of the root resctrl control group and monitor group mon0.
- *
- * 4)  res:group0
- *     mon:
- *
- *    Task is part of resctrl control group group0, and it is not associated
- *    to any monitor group.
- *
- * 5) res:group0
- *    mon:mon1
- *
- *    Task is part of resctrl control group group0 and monitor group mon1.
- */
-int proc_resctrl_show(struct seq_file *s, struct pid_namespace *ns,
-		      struct pid *pid, struct task_struct *tsk)
-{
-	struct rdtgroup *rdtg;
-	int ret = 0;
-
-	mutex_lock(&rdtgroup_mutex);
-
-	/* Return empty if resctrl has not been mounted. */
-	if (!resctrl_mounted) {
-		seq_puts(s, "res:\nmon:\n");
-		goto unlock;
-	}
-
-	list_for_each_entry(rdtg, &rdt_all_groups, rdtgroup_list) {
-		struct rdtgroup *crg;
-
-		/*
-		 * Task information is only relevant for shareable
-		 * and exclusive groups.
-		 */
-		if (rdtg->mode != RDT_MODE_SHAREABLE &&
-		    rdtg->mode != RDT_MODE_EXCLUSIVE)
-			continue;
-
-		if (!resctrl_arch_match_closid(tsk, rdtg->closid))
-			continue;
-
-		seq_printf(s, "res:%s%s\n", (rdtg == &rdtgroup_default) ? "/" : "",
-			   rdt_kn_name(rdtg->kn));
-		seq_puts(s, "mon:");
-		list_for_each_entry(crg, &rdtg->mon.crdtgrp_list,
-				    mon.crdtgrp_list) {
-			if (!resctrl_arch_match_rmid(tsk, crg->mon.parent->closid,
-						     crg->mon.rmid))
-				continue;
-			seq_printf(s, "%s", rdt_kn_name(crg->kn));
-			break;
-		}
-		seq_putc(s, '\n');
-		goto unlock;
-	}
-	/*
-	 * The above search should succeed. Otherwise return
-	 * with an error.
-	 */
-	ret = -ENOENT;
-unlock:
-	mutex_unlock(&rdtgroup_mutex);
-
-	return ret;
-}
-#endif
-
-static int rdt_last_cmd_status_show(struct kernfs_open_file *of,
-				    struct seq_file *seq, void *v)
-{
-	int len;
-
-	mutex_lock(&rdtgroup_mutex);
-	len = seq_buf_used(&last_cmd_status);
-	if (len)
-		seq_printf(seq, "%.*s", len, last_cmd_status_buf);
-	else
-		seq_puts(seq, "ok\n");
-	mutex_unlock(&rdtgroup_mutex);
-	return 0;
-}
-
-static void *rdt_kn_parent_priv(struct kernfs_node *kn)
-{
-	/*
-	 * The parent pointer is only valid within RCU section since it can be
-	 * replaced.
-	 */
-	guard(rcu)();
-	return rcu_dereference(kn->__parent)->priv;
-}
-
-static int rdt_num_closids_show(struct kernfs_open_file *of,
-				struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
-
-	seq_printf(seq, "%u\n", s->num_closid);
-	return 0;
-}
-
-static int rdt_default_ctrl_show(struct kernfs_open_file *of,
-				 struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
-	struct rdt_resource *r = s->res;
-
-	seq_printf(seq, "%x\n", resctrl_get_default_ctrl(r));
-	return 0;
-}
-
-static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
-				 struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
-	struct rdt_resource *r = s->res;
-
-	seq_printf(seq, "%u\n", r->cache.min_cbm_bits);
-	return 0;
-}
-
-static int rdt_shareable_bits_show(struct kernfs_open_file *of,
-				   struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
-	struct rdt_resource *r = s->res;
-
-	seq_printf(seq, "%x\n", r->cache.shareable_bits);
-	return 0;
-}
-
-/*
- * rdt_bit_usage_show - Display current usage of resources
- *
- * A domain is a shared resource that can now be allocated differently. Here
- * we display the current regions of the domain as an annotated bitmask.
- * For each domain of this resource its allocation bitmask
- * is annotated as below to indicate the current usage of the corresponding bit:
- *   0 - currently unused
- *   X - currently available for sharing and used by software and hardware
- *   H - currently used by hardware only but available for software use
- *   S - currently used and shareable by software only
- *   E - currently used exclusively by one resource group
- *   P - currently pseudo-locked by one resource group
- */
-static int rdt_bit_usage_show(struct kernfs_open_file *of,
-			      struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
-	/*
-	 * Use unsigned long even though only 32 bits are used to ensure
-	 * test_bit() is used safely.
-	 */
-	unsigned long sw_shareable = 0, hw_shareable = 0;
-	unsigned long exclusive = 0, pseudo_locked = 0;
-	struct rdt_resource *r = s->res;
-	struct rdt_ctrl_domain *dom;
-	int i, hwb, swb, excl, psl;
-	enum rdtgrp_mode mode;
-	bool sep = false;
-	u32 ctrl_val;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-	hw_shareable = r->cache.shareable_bits;
-	list_for_each_entry(dom, &r->ctrl_domains, hdr.list) {
-		if (sep)
-			seq_putc(seq, ';');
-		sw_shareable = 0;
-		exclusive = 0;
-		seq_printf(seq, "%d=", dom->hdr.id);
-		for (i = 0; i < closids_supported(); i++) {
-			if (!closid_allocated(i))
-				continue;
-			ctrl_val = resctrl_arch_get_config(r, dom, i,
-							   s->conf_type);
-			mode = rdtgroup_mode_by_closid(i);
-			switch (mode) {
-			case RDT_MODE_SHAREABLE:
-				sw_shareable |= ctrl_val;
-				break;
-			case RDT_MODE_EXCLUSIVE:
-				exclusive |= ctrl_val;
-				break;
-			case RDT_MODE_PSEUDO_LOCKSETUP:
-			/*
-			 * RDT_MODE_PSEUDO_LOCKSETUP is possible
-			 * here but not included since the CBM
-			 * associated with this CLOSID in this mode
-			 * is not initialized and no task or cpu can be
-			 * assigned this CLOSID.
-			 */
-				break;
-			case RDT_MODE_PSEUDO_LOCKED:
-			case RDT_NUM_MODES:
-				WARN(1,
-				     "invalid mode for closid %d\n", i);
-				break;
-			}
-		}
-		for (i = r->cache.cbm_len - 1; i >= 0; i--) {
-			pseudo_locked = dom->plr ? dom->plr->cbm : 0;
-			hwb = test_bit(i, &hw_shareable);
-			swb = test_bit(i, &sw_shareable);
-			excl = test_bit(i, &exclusive);
-			psl = test_bit(i, &pseudo_locked);
-			if (hwb && swb)
-				seq_putc(seq, 'X');
-			else if (hwb && !swb)
-				seq_putc(seq, 'H');
-			else if (!hwb && swb)
-				seq_putc(seq, 'S');
-			else if (excl)
-				seq_putc(seq, 'E');
-			else if (psl)
-				seq_putc(seq, 'P');
-			else /* Unused bits remain */
-				seq_putc(seq, '0');
-		}
-		sep = true;
-	}
-	seq_putc(seq, '\n');
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-	return 0;
-}
-
-static int rdt_min_bw_show(struct kernfs_open_file *of,
-			   struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
-	struct rdt_resource *r = s->res;
-
-	seq_printf(seq, "%u\n", r->membw.min_bw);
-	return 0;
-}
-
-static int rdt_num_rmids_show(struct kernfs_open_file *of,
-			      struct seq_file *seq, void *v)
-{
-	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
-
-	seq_printf(seq, "%d\n", r->num_rmid);
-
-	return 0;
-}
-
-static int rdt_mon_features_show(struct kernfs_open_file *of,
-				 struct seq_file *seq, void *v)
-{
-	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
-	struct mon_evt *mevt;
-
-	list_for_each_entry(mevt, &r->evt_list, list) {
-		seq_printf(seq, "%s\n", mevt->name);
-		if (mevt->configurable)
-			seq_printf(seq, "%s_config\n", mevt->name);
-	}
-
-	return 0;
-}
-
-static int rdt_bw_gran_show(struct kernfs_open_file *of,
-			    struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
-	struct rdt_resource *r = s->res;
-
-	seq_printf(seq, "%u\n", r->membw.bw_gran);
-	return 0;
-}
-
-static int rdt_delay_linear_show(struct kernfs_open_file *of,
-				 struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
-	struct rdt_resource *r = s->res;
-
-	seq_printf(seq, "%u\n", r->membw.delay_linear);
-	return 0;
-}
-
-static int max_threshold_occ_show(struct kernfs_open_file *of,
-				  struct seq_file *seq, void *v)
-{
-	seq_printf(seq, "%u\n", resctrl_rmid_realloc_threshold);
-
-	return 0;
-}
-
-static int rdt_thread_throttle_mode_show(struct kernfs_open_file *of,
-					 struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
-	struct rdt_resource *r = s->res;
-
-	switch (r->membw.throttle_mode) {
-	case THREAD_THROTTLE_PER_THREAD:
-		seq_puts(seq, "per-thread\n");
-		return 0;
-	case THREAD_THROTTLE_MAX:
-		seq_puts(seq, "max\n");
-		return 0;
-	case THREAD_THROTTLE_UNDEFINED:
-		seq_puts(seq, "undefined\n");
-		return 0;
-	}
-
-	WARN_ON_ONCE(1);
-
-	return 0;
-}
-
-static ssize_t max_threshold_occ_write(struct kernfs_open_file *of,
-				       char *buf, size_t nbytes, loff_t off)
-{
-	unsigned int bytes;
-	int ret;
-
-	ret = kstrtouint(buf, 0, &bytes);
-	if (ret)
-		return ret;
-
-	if (bytes > resctrl_rmid_realloc_limit)
-		return -EINVAL;
-
-	resctrl_rmid_realloc_threshold = resctrl_arch_round_mon_val(bytes);
-
-	return nbytes;
-}
-
-/*
- * rdtgroup_mode_show - Display mode of this resource group
- */
-static int rdtgroup_mode_show(struct kernfs_open_file *of,
-			      struct seq_file *s, void *v)
-{
-	struct rdtgroup *rdtgrp;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (!rdtgrp) {
-		rdtgroup_kn_unlock(of->kn);
-		return -ENOENT;
-	}
-
-	seq_printf(s, "%s\n", rdtgroup_mode_str(rdtgrp->mode));
-
-	rdtgroup_kn_unlock(of->kn);
-	return 0;
-}
-
-static enum resctrl_conf_type resctrl_peer_type(enum resctrl_conf_type my_type)
-{
-	switch (my_type) {
-	case CDP_CODE:
-		return CDP_DATA;
-	case CDP_DATA:
-		return CDP_CODE;
-	default:
-	case CDP_NONE:
-		return CDP_NONE;
-	}
-}
-
-static int rdt_has_sparse_bitmasks_show(struct kernfs_open_file *of,
-					struct seq_file *seq, void *v)
-{
-	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
-	struct rdt_resource *r = s->res;
-
-	seq_printf(seq, "%u\n", r->cache.arch_has_sparse_bitmasks);
-
-	return 0;
-}
-
-/**
- * __rdtgroup_cbm_overlaps - Does CBM for intended closid overlap with other
- * @r: Resource to which domain instance @d belongs.
- * @d: The domain instance for which @closid is being tested.
- * @cbm: Capacity bitmask being tested.
- * @closid: Intended closid for @cbm.
- * @type: CDP type of @r.
- * @exclusive: Only check if overlaps with exclusive resource groups
- *
- * Checks if provided @cbm intended to be used for @closid on domain
- * @d overlaps with any other closids or other hardware usage associated
- * with this domain. If @exclusive is true then only overlaps with
- * resource groups in exclusive mode will be considered. If @exclusive
- * is false then overlaps with any resource group or hardware entities
- * will be considered.
- *
- * @cbm is unsigned long, even if only 32 bits are used, to make the
- * bitmap functions work correctly.
- *
- * Return: false if CBM does not overlap, true if it does.
- */
-static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_ctrl_domain *d,
-				    unsigned long cbm, int closid,
-				    enum resctrl_conf_type type, bool exclusive)
-{
-	enum rdtgrp_mode mode;
-	unsigned long ctrl_b;
-	int i;
-
-	/* Check for any overlap with regions used by hardware directly */
-	if (!exclusive) {
-		ctrl_b = r->cache.shareable_bits;
-		if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len))
-			return true;
-	}
-
-	/* Check for overlap with other resource groups */
-	for (i = 0; i < closids_supported(); i++) {
-		ctrl_b = resctrl_arch_get_config(r, d, i, type);
-		mode = rdtgroup_mode_by_closid(i);
-		if (closid_allocated(i) && i != closid &&
-		    mode != RDT_MODE_PSEUDO_LOCKSETUP) {
-			if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len)) {
-				if (exclusive) {
-					if (mode == RDT_MODE_EXCLUSIVE)
-						return true;
-					continue;
-				}
-				return true;
-			}
-		}
-	}
-
-	return false;
-}
-
-/**
- * rdtgroup_cbm_overlaps - Does CBM overlap with other use of hardware
- * @s: Schema for the resource to which domain instance @d belongs.
- * @d: The domain instance for which @closid is being tested.
- * @cbm: Capacity bitmask being tested.
- * @closid: Intended closid for @cbm.
- * @exclusive: Only check if overlaps with exclusive resource groups
- *
- * Resources that can be allocated using a CBM can use the CBM to control
- * the overlap of these allocations. rdtgroup_cmb_overlaps() is the test
- * for overlap. Overlap test is not limited to the specific resource for
- * which the CBM is intended though - when dealing with CDP resources that
- * share the underlying hardware the overlap check should be performed on
- * the CDP resource sharing the hardware also.
- *
- * Refer to description of __rdtgroup_cbm_overlaps() for the details of the
- * overlap test.
- *
- * Return: true if CBM overlap detected, false if there is no overlap
- */
-bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_ctrl_domain *d,
-			   unsigned long cbm, int closid, bool exclusive)
-{
-	enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
-	struct rdt_resource *r = s->res;
-
-	if (__rdtgroup_cbm_overlaps(r, d, cbm, closid, s->conf_type,
-				    exclusive))
-		return true;
-
-	if (!resctrl_arch_get_cdp_enabled(r->rid))
-		return false;
-	return  __rdtgroup_cbm_overlaps(r, d, cbm, closid, peer_type, exclusive);
-}
-
-/**
- * rdtgroup_mode_test_exclusive - Test if this resource group can be exclusive
- * @rdtgrp: Resource group identified through its closid.
- *
- * An exclusive resource group implies that there should be no sharing of
- * its allocated resources. At the time this group is considered to be
- * exclusive this test can determine if its current schemata supports this
- * setting by testing for overlap with all other resource groups.
- *
- * Return: true if resource group can be exclusive, false if there is overlap
- * with allocations of other resource groups and thus this resource group
- * cannot be exclusive.
- */
-static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
-{
-	int closid = rdtgrp->closid;
-	struct rdt_ctrl_domain *d;
-	struct resctrl_schema *s;
-	struct rdt_resource *r;
-	bool has_cache = false;
-	u32 ctrl;
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	list_for_each_entry(s, &resctrl_schema_all, list) {
-		r = s->res;
-		if (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)
-			continue;
-		has_cache = true;
-		list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
-			ctrl = resctrl_arch_get_config(r, d, closid,
-						       s->conf_type);
-			if (rdtgroup_cbm_overlaps(s, d, ctrl, closid, false)) {
-				rdt_last_cmd_puts("Schemata overlaps\n");
-				return false;
-			}
-		}
-	}
-
-	if (!has_cache) {
-		rdt_last_cmd_puts("Cannot be exclusive without CAT/CDP\n");
-		return false;
-	}
-
-	return true;
-}
-
-/*
- * rdtgroup_mode_write - Modify the resource group's mode
- */
-static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
-				   char *buf, size_t nbytes, loff_t off)
-{
-	struct rdtgroup *rdtgrp;
-	enum rdtgrp_mode mode;
-	int ret = 0;
-
-	/* Valid input requires a trailing newline */
-	if (nbytes == 0 || buf[nbytes - 1] != '\n')
-		return -EINVAL;
-	buf[nbytes - 1] = '\0';
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (!rdtgrp) {
-		rdtgroup_kn_unlock(of->kn);
-		return -ENOENT;
-	}
-
-	rdt_last_cmd_clear();
-
-	mode = rdtgrp->mode;
-
-	if ((!strcmp(buf, "shareable") && mode == RDT_MODE_SHAREABLE) ||
-	    (!strcmp(buf, "exclusive") && mode == RDT_MODE_EXCLUSIVE) ||
-	    (!strcmp(buf, "pseudo-locksetup") &&
-	     mode == RDT_MODE_PSEUDO_LOCKSETUP) ||
-	    (!strcmp(buf, "pseudo-locked") && mode == RDT_MODE_PSEUDO_LOCKED))
-		goto out;
-
-	if (mode == RDT_MODE_PSEUDO_LOCKED) {
-		rdt_last_cmd_puts("Cannot change pseudo-locked group\n");
-		ret = -EINVAL;
-		goto out;
-	}
-
-	if (!strcmp(buf, "shareable")) {
-		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-			ret = rdtgroup_locksetup_exit(rdtgrp);
-			if (ret)
-				goto out;
-		}
-		rdtgrp->mode = RDT_MODE_SHAREABLE;
-	} else if (!strcmp(buf, "exclusive")) {
-		if (!rdtgroup_mode_test_exclusive(rdtgrp)) {
-			ret = -EINVAL;
-			goto out;
-		}
-		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-			ret = rdtgroup_locksetup_exit(rdtgrp);
-			if (ret)
-				goto out;
-		}
-		rdtgrp->mode = RDT_MODE_EXCLUSIVE;
-	} else if (IS_ENABLED(CONFIG_RESCTRL_FS_PSEUDO_LOCK) &&
-		   !strcmp(buf, "pseudo-locksetup")) {
-		ret = rdtgroup_locksetup_enter(rdtgrp);
-		if (ret)
-			goto out;
-		rdtgrp->mode = RDT_MODE_PSEUDO_LOCKSETUP;
-	} else {
-		rdt_last_cmd_puts("Unknown or unsupported mode\n");
-		ret = -EINVAL;
-	}
-
-out:
-	rdtgroup_kn_unlock(of->kn);
-	return ret ?: nbytes;
-}
-
-/**
- * rdtgroup_cbm_to_size - Translate CBM to size in bytes
- * @r: RDT resource to which @d belongs.
- * @d: RDT domain instance.
- * @cbm: bitmask for which the size should be computed.
- *
- * The bitmask provided associated with the RDT domain instance @d will be
- * translated into how many bytes it represents. The size in bytes is
- * computed by first dividing the total cache size by the CBM length to
- * determine how many bytes each bit in the bitmask represents. The result
- * is multiplied with the number of bits set in the bitmask.
- *
- * @cbm is unsigned long, even if only 32 bits are used to make the
- * bitmap functions work correctly.
- */
-unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
-				  struct rdt_ctrl_domain *d, unsigned long cbm)
-{
-	unsigned int size = 0;
-	struct cacheinfo *ci;
-	int num_b;
-
-	if (WARN_ON_ONCE(r->ctrl_scope != RESCTRL_L2_CACHE && r->ctrl_scope != RESCTRL_L3_CACHE))
-		return size;
-
-	num_b = bitmap_weight(&cbm, r->cache.cbm_len);
-	ci = get_cpu_cacheinfo_level(cpumask_any(&d->hdr.cpu_mask), r->ctrl_scope);
-	if (ci)
-		size = ci->size / r->cache.cbm_len * num_b;
-
-	return size;
-}
-
-bool is_mba_sc(struct rdt_resource *r)
-{
-	if (!r)
-		r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-
-	/*
-	 * The software controller support is only applicable to MBA resource.
-	 * Make sure to check for resource type.
-	 */
-	if (r->rid != RDT_RESOURCE_MBA)
-		return false;
-
-	return r->membw.mba_sc;
-}
-
-/*
- * rdtgroup_size_show - Display size in bytes of allocated regions
- *
- * The "size" file mirrors the layout of the "schemata" file, printing the
- * size in bytes of each region instead of the capacity bitmask.
- */
-static int rdtgroup_size_show(struct kernfs_open_file *of,
-			      struct seq_file *s, void *v)
-{
-	struct resctrl_schema *schema;
-	enum resctrl_conf_type type;
-	struct rdt_ctrl_domain *d;
-	struct rdtgroup *rdtgrp;
-	struct rdt_resource *r;
-	unsigned int size;
-	int ret = 0;
-	u32 closid;
-	bool sep;
-	u32 ctrl;
-
-	rdtgrp = rdtgroup_kn_lock_live(of->kn);
-	if (!rdtgrp) {
-		rdtgroup_kn_unlock(of->kn);
-		return -ENOENT;
-	}
-
-	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
-		if (!rdtgrp->plr->d) {
-			rdt_last_cmd_clear();
-			rdt_last_cmd_puts("Cache domain offline\n");
-			ret = -ENODEV;
-		} else {
-			seq_printf(s, "%*s:", max_name_width,
-				   rdtgrp->plr->s->name);
-			size = rdtgroup_cbm_to_size(rdtgrp->plr->s->res,
-						    rdtgrp->plr->d,
-						    rdtgrp->plr->cbm);
-			seq_printf(s, "%d=%u\n", rdtgrp->plr->d->hdr.id, size);
-		}
-		goto out;
-	}
-
-	closid = rdtgrp->closid;
-
-	list_for_each_entry(schema, &resctrl_schema_all, list) {
-		r = schema->res;
-		type = schema->conf_type;
-		sep = false;
-		seq_printf(s, "%*s:", max_name_width, schema->name);
-		list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
-			if (sep)
-				seq_putc(s, ';');
-			if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
-				size = 0;
-			} else {
-				if (is_mba_sc(r))
-					ctrl = d->mbps_val[closid];
-				else
-					ctrl = resctrl_arch_get_config(r, d,
-								       closid,
-								       type);
-				if (r->rid == RDT_RESOURCE_MBA ||
-				    r->rid == RDT_RESOURCE_SMBA)
-					size = ctrl;
-				else
-					size = rdtgroup_cbm_to_size(r, d, ctrl);
-			}
-			seq_printf(s, "%d=%u", d->hdr.id, size);
-			sep = true;
-		}
-		seq_putc(s, '\n');
-	}
-
-out:
-	rdtgroup_kn_unlock(of->kn);
-
-	return ret;
-}
-
-#define INVALID_CONFIG_INDEX   UINT_MAX
-
-/**
- * mon_event_config_index_get - get the hardware index for the
- *                              configurable event
- * @evtid: event id.
- *
- * Return: 0 for evtid == QOS_L3_MBM_TOTAL_EVENT_ID
- *         1 for evtid == QOS_L3_MBM_LOCAL_EVENT_ID
- *         INVALID_CONFIG_INDEX for invalid evtid
- */
-static inline unsigned int mon_event_config_index_get(u32 evtid)
-{
-	switch (evtid) {
-	case QOS_L3_MBM_TOTAL_EVENT_ID:
-		return 0;
-	case QOS_L3_MBM_LOCAL_EVENT_ID:
-		return 1;
-	default:
-		/* Should never reach here */
-		return INVALID_CONFIG_INDEX;
-	}
-}
-
-void resctrl_arch_mon_event_config_read(void *_config_info)
-{
-	struct resctrl_mon_config_info *config_info = _config_info;
-	unsigned int index;
-	u64 msrval;
-
-	index = mon_event_config_index_get(config_info->evtid);
-	if (index == INVALID_CONFIG_INDEX) {
-		pr_warn_once("Invalid event id %d\n", config_info->evtid);
-		return;
-	}
-	rdmsrl(MSR_IA32_EVT_CFG_BASE + index, msrval);
-
-	/* Report only the valid event configuration bits */
-	config_info->mon_config = msrval & MAX_EVT_CONFIG_BITS;
-}
-
-static void mondata_config_read(struct resctrl_mon_config_info *mon_info)
-{
-	smp_call_function_any(&mon_info->d->hdr.cpu_mask,
-			      resctrl_arch_mon_event_config_read, mon_info, 1);
-}
-
-static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid)
-{
-	struct resctrl_mon_config_info mon_info;
-	struct rdt_mon_domain *dom;
-	bool sep = false;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	list_for_each_entry(dom, &r->mon_domains, hdr.list) {
-		if (sep)
-			seq_puts(s, ";");
-
-		memset(&mon_info, 0, sizeof(struct resctrl_mon_config_info));
-		mon_info.r = r;
-		mon_info.d = dom;
-		mon_info.evtid = evtid;
-		mondata_config_read(&mon_info);
-
-		seq_printf(s, "%d=0x%02x", dom->hdr.id, mon_info.mon_config);
-		sep = true;
-	}
-	seq_puts(s, "\n");
-
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-
-	return 0;
-}
-
-static int mbm_total_bytes_config_show(struct kernfs_open_file *of,
-				       struct seq_file *seq, void *v)
-{
-	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
-
-	mbm_config_show(seq, r, QOS_L3_MBM_TOTAL_EVENT_ID);
-
-	return 0;
-}
-
-static int mbm_local_bytes_config_show(struct kernfs_open_file *of,
-				       struct seq_file *seq, void *v)
-{
-	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
-
-	mbm_config_show(seq, r, QOS_L3_MBM_LOCAL_EVENT_ID);
-
-	return 0;
-}
-
-void resctrl_arch_mon_event_config_write(void *_config_info)
-{
-	struct resctrl_mon_config_info *config_info = _config_info;
-	unsigned int index;
-
-	index = mon_event_config_index_get(config_info->evtid);
-	if (index == INVALID_CONFIG_INDEX) {
-		pr_warn_once("Invalid event id %d\n", config_info->evtid);
-		return;
-	}
-	wrmsr(MSR_IA32_EVT_CFG_BASE + index, config_info->mon_config, 0);
-}
-
-static void mbm_config_write_domain(struct rdt_resource *r,
-				    struct rdt_mon_domain *d, u32 evtid, u32 val)
-{
-	struct resctrl_mon_config_info mon_info = {0};
-
-	/*
-	 * Read the current config value first. If both are the same then
-	 * no need to write it again.
-	 */
-	mon_info.r = r;
-	mon_info.d = d;
-	mon_info.evtid = evtid;
-	mondata_config_read(&mon_info);
-	if (mon_info.mon_config == val)
-		return;
-
-	mon_info.mon_config = val;
-
-	/*
-	 * Update MSR_IA32_EVT_CFG_BASE MSR on one of the CPUs in the
-	 * domain. The MSRs offset from MSR MSR_IA32_EVT_CFG_BASE
-	 * are scoped at the domain level. Writing any of these MSRs
-	 * on one CPU is observed by all the CPUs in the domain.
-	 */
-	smp_call_function_any(&d->hdr.cpu_mask, resctrl_arch_mon_event_config_write,
-			      &mon_info, 1);
-
-	/*
-	 * When an Event Configuration is changed, the bandwidth counters
-	 * for all RMIDs and Events will be cleared by the hardware. The
-	 * hardware also sets MSR_IA32_QM_CTR.Unavailable (bit 62) for
-	 * every RMID on the next read to any event for every RMID.
-	 * Subsequent reads will have MSR_IA32_QM_CTR.Unavailable (bit 62)
-	 * cleared while it is tracked by the hardware. Clear the
-	 * mbm_local and mbm_total counts for all the RMIDs.
-	 */
-	resctrl_arch_reset_rmid_all(r, d);
-}
-
-static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
-{
-	char *dom_str = NULL, *id_str;
-	unsigned long dom_id, val;
-	struct rdt_mon_domain *d;
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-next:
-	if (!tok || tok[0] == '\0')
-		return 0;
-
-	/* Start processing the strings for each domain */
-	dom_str = strim(strsep(&tok, ";"));
-	id_str = strsep(&dom_str, "=");
-
-	if (!id_str || kstrtoul(id_str, 10, &dom_id)) {
-		rdt_last_cmd_puts("Missing '=' or non-numeric domain id\n");
-		return -EINVAL;
-	}
-
-	if (!dom_str || kstrtoul(dom_str, 16, &val)) {
-		rdt_last_cmd_puts("Non-numeric event configuration value\n");
-		return -EINVAL;
-	}
-
-	/* Value from user cannot be more than the supported set of events */
-	if ((val & r->mbm_cfg_mask) != val) {
-		rdt_last_cmd_printf("Invalid event configuration: max valid mask is 0x%02x\n",
-				    r->mbm_cfg_mask);
-		return -EINVAL;
-	}
-
-	list_for_each_entry(d, &r->mon_domains, hdr.list) {
-		if (d->hdr.id == dom_id) {
-			mbm_config_write_domain(r, d, evtid, val);
-			goto next;
-		}
-	}
-
-	return -EINVAL;
-}
-
-static ssize_t mbm_total_bytes_config_write(struct kernfs_open_file *of,
-					    char *buf, size_t nbytes,
-					    loff_t off)
-{
-	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
-	int ret;
-
-	/* Valid input requires a trailing newline */
-	if (nbytes == 0 || buf[nbytes - 1] != '\n')
-		return -EINVAL;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	rdt_last_cmd_clear();
-
-	buf[nbytes - 1] = '\0';
-
-	ret = mon_config_write(r, buf, QOS_L3_MBM_TOTAL_EVENT_ID);
-
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-
-	return ret ?: nbytes;
-}
-
-static ssize_t mbm_local_bytes_config_write(struct kernfs_open_file *of,
-					    char *buf, size_t nbytes,
-					    loff_t off)
-{
-	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
-	int ret;
-
-	/* Valid input requires a trailing newline */
-	if (nbytes == 0 || buf[nbytes - 1] != '\n')
-		return -EINVAL;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	rdt_last_cmd_clear();
-
-	buf[nbytes - 1] = '\0';
-
-	ret = mon_config_write(r, buf, QOS_L3_MBM_LOCAL_EVENT_ID);
-
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-
-	return ret ?: nbytes;
-}
-
-/* rdtgroup information files for one cache resource. */
-static struct rftype res_common_files[] = {
-	{
-		.name		= "last_cmd_status",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_last_cmd_status_show,
-		.fflags		= RFTYPE_TOP_INFO,
-	},
-	{
-		.name		= "num_closids",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_num_closids_show,
-		.fflags		= RFTYPE_CTRL_INFO,
-	},
-	{
-		.name		= "mon_features",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_mon_features_show,
-		.fflags		= RFTYPE_MON_INFO,
-	},
-	{
-		.name		= "num_rmids",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_num_rmids_show,
-		.fflags		= RFTYPE_MON_INFO,
-	},
-	{
-		.name		= "cbm_mask",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_default_ctrl_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
-	},
-	{
-		.name		= "min_cbm_bits",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_min_cbm_bits_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
-	},
-	{
-		.name		= "shareable_bits",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_shareable_bits_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
-	},
-	{
-		.name		= "bit_usage",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_bit_usage_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
-	},
-	{
-		.name		= "min_bandwidth",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_min_bw_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
-	},
-	{
-		.name		= "bandwidth_gran",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_bw_gran_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
-	},
-	{
-		.name		= "delay_linear",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_delay_linear_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
-	},
-	/*
-	 * Platform specific which (if any) capabilities are provided by
-	 * thread_throttle_mode. Defer "fflags" initialization to platform
-	 * discovery.
-	 */
-	{
-		.name		= "thread_throttle_mode",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_thread_throttle_mode_show,
-	},
-	{
-		.name		= "max_threshold_occupancy",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.write		= max_threshold_occ_write,
-		.seq_show	= max_threshold_occ_show,
-		.fflags		= RFTYPE_MON_INFO | RFTYPE_RES_CACHE,
-	},
-	{
-		.name		= "mbm_total_bytes_config",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= mbm_total_bytes_config_show,
-		.write		= mbm_total_bytes_config_write,
-	},
-	{
-		.name		= "mbm_local_bytes_config",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= mbm_local_bytes_config_show,
-		.write		= mbm_local_bytes_config_write,
-	},
-	{
-		.name		= "cpus",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.write		= rdtgroup_cpus_write,
-		.seq_show	= rdtgroup_cpus_show,
-		.fflags		= RFTYPE_BASE,
-	},
-	{
-		.name		= "cpus_list",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.write		= rdtgroup_cpus_write,
-		.seq_show	= rdtgroup_cpus_show,
-		.flags		= RFTYPE_FLAGS_CPUS_LIST,
-		.fflags		= RFTYPE_BASE,
-	},
-	{
-		.name		= "tasks",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.write		= rdtgroup_tasks_write,
-		.seq_show	= rdtgroup_tasks_show,
-		.fflags		= RFTYPE_BASE,
-	},
-	{
-		.name		= "mon_hw_id",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdtgroup_rmid_show,
-		.fflags		= RFTYPE_MON_BASE | RFTYPE_DEBUG,
-	},
-	{
-		.name		= "schemata",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.write		= rdtgroup_schemata_write,
-		.seq_show	= rdtgroup_schemata_show,
-		.fflags		= RFTYPE_CTRL_BASE,
-	},
-	{
-		.name		= "mba_MBps_event",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.write		= rdtgroup_mba_mbps_event_write,
-		.seq_show	= rdtgroup_mba_mbps_event_show,
-	},
-	{
-		.name		= "mode",
-		.mode		= 0644,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.write		= rdtgroup_mode_write,
-		.seq_show	= rdtgroup_mode_show,
-		.fflags		= RFTYPE_CTRL_BASE,
-	},
-	{
-		.name		= "size",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdtgroup_size_show,
-		.fflags		= RFTYPE_CTRL_BASE,
-	},
-	{
-		.name		= "sparse_masks",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdt_has_sparse_bitmasks_show,
-		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
-	},
-	{
-		.name		= "ctrl_hw_id",
-		.mode		= 0444,
-		.kf_ops		= &rdtgroup_kf_single_ops,
-		.seq_show	= rdtgroup_closid_show,
-		.fflags		= RFTYPE_CTRL_BASE | RFTYPE_DEBUG,
-	},
-};
-
-static int rdtgroup_add_files(struct kernfs_node *kn, unsigned long fflags)
-{
-	struct rftype *rfts, *rft;
-	int ret, len;
-
-	rfts = res_common_files;
-	len = ARRAY_SIZE(res_common_files);
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	if (resctrl_debug)
-		fflags |= RFTYPE_DEBUG;
-
-	for (rft = rfts; rft < rfts + len; rft++) {
-		if (rft->fflags && ((fflags & rft->fflags) == rft->fflags)) {
-			ret = rdtgroup_add_file(kn, rft);
-			if (ret)
-				goto error;
-		}
-	}
-
-	return 0;
-error:
-	pr_warn("Failed to add %s, err=%d\n", rft->name, ret);
-	while (--rft >= rfts) {
-		if ((fflags & rft->fflags) == rft->fflags)
-			kernfs_remove_by_name(kn, rft->name);
-	}
-	return ret;
-}
-
-static struct rftype *rdtgroup_get_rftype_by_name(const char *name)
-{
-	struct rftype *rfts, *rft;
-	int len;
-
-	rfts = res_common_files;
-	len = ARRAY_SIZE(res_common_files);
-
-	for (rft = rfts; rft < rfts + len; rft++) {
-		if (!strcmp(rft->name, name))
-			return rft;
-	}
-
-	return NULL;
-}
-
-static void thread_throttle_mode_init(void)
-{
-	enum membw_throttle_mode throttle_mode = THREAD_THROTTLE_UNDEFINED;
-	struct rdt_resource *r_mba, *r_smba;
-
-	r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-	if (r_mba->alloc_capable &&
-	    r_mba->membw.throttle_mode != THREAD_THROTTLE_UNDEFINED)
-		throttle_mode = r_mba->membw.throttle_mode;
-
-	r_smba = resctrl_arch_get_resource(RDT_RESOURCE_SMBA);
-	if (r_smba->alloc_capable &&
-	    r_smba->membw.throttle_mode != THREAD_THROTTLE_UNDEFINED)
-		throttle_mode = r_smba->membw.throttle_mode;
-
-	if (throttle_mode == THREAD_THROTTLE_UNDEFINED)
-		return;
-
-	resctrl_file_fflags_init("thread_throttle_mode",
-				 RFTYPE_CTRL_INFO | RFTYPE_RES_MB);
-}
-
-void resctrl_file_fflags_init(const char *config, unsigned long fflags)
-{
-	struct rftype *rft;
-
-	rft = rdtgroup_get_rftype_by_name(config);
-	if (rft)
-		rft->fflags = fflags;
-}
-
-/**
- * rdtgroup_kn_mode_restrict - Restrict user access to named resctrl file
- * @r: The resource group with which the file is associated.
- * @name: Name of the file
- *
- * The permissions of named resctrl file, directory, or link are modified
- * to not allow read, write, or execute by any user.
- *
- * WARNING: This function is intended to communicate to the user that the
- * resctrl file has been locked down - that it is not relevant to the
- * particular state the system finds itself in. It should not be relied
- * on to protect from user access because after the file's permissions
- * are restricted the user can still change the permissions using chmod
- * from the command line.
- *
- * Return: 0 on success, <0 on failure.
- */
-int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name)
-{
-	struct iattr iattr = {.ia_valid = ATTR_MODE,};
-	struct kernfs_node *kn;
-	int ret = 0;
-
-	kn = kernfs_find_and_get_ns(r->kn, name, NULL);
-	if (!kn)
-		return -ENOENT;
-
-	switch (kernfs_type(kn)) {
-	case KERNFS_DIR:
-		iattr.ia_mode = S_IFDIR;
-		break;
-	case KERNFS_FILE:
-		iattr.ia_mode = S_IFREG;
-		break;
-	case KERNFS_LINK:
-		iattr.ia_mode = S_IFLNK;
-		break;
-	}
-
-	ret = kernfs_setattr(kn, &iattr);
-	kernfs_put(kn);
-	return ret;
-}
-
-/**
- * rdtgroup_kn_mode_restore - Restore user access to named resctrl file
- * @r: The resource group with which the file is associated.
- * @name: Name of the file
- * @mask: Mask of permissions that should be restored
- *
- * Restore the permissions of the named file. If @name is a directory the
- * permissions of its parent will be used.
- *
- * Return: 0 on success, <0 on failure.
- */
-int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
-			     umode_t mask)
-{
-	struct iattr iattr = {.ia_valid = ATTR_MODE,};
-	struct kernfs_node *kn, *parent;
-	struct rftype *rfts, *rft;
-	int ret, len;
-
-	rfts = res_common_files;
-	len = ARRAY_SIZE(res_common_files);
-
-	for (rft = rfts; rft < rfts + len; rft++) {
-		if (!strcmp(rft->name, name))
-			iattr.ia_mode = rft->mode & mask;
-	}
-
-	kn = kernfs_find_and_get_ns(r->kn, name, NULL);
-	if (!kn)
-		return -ENOENT;
-
-	switch (kernfs_type(kn)) {
-	case KERNFS_DIR:
-		parent = kernfs_get_parent(kn);
-		if (parent) {
-			iattr.ia_mode |= parent->mode;
-			kernfs_put(parent);
-		}
-		iattr.ia_mode |= S_IFDIR;
-		break;
-	case KERNFS_FILE:
-		iattr.ia_mode |= S_IFREG;
-		break;
-	case KERNFS_LINK:
-		iattr.ia_mode |= S_IFLNK;
-		break;
-	}
-
-	ret = kernfs_setattr(kn, &iattr);
-	kernfs_put(kn);
-	return ret;
-}
-
-static int rdtgroup_mkdir_info_resdir(void *priv, char *name,
-				      unsigned long fflags)
-{
-	struct kernfs_node *kn_subdir;
-	int ret;
-
-	kn_subdir = kernfs_create_dir(kn_info, name,
-				      kn_info->mode, priv);
-	if (IS_ERR(kn_subdir))
-		return PTR_ERR(kn_subdir);
-
-	ret = rdtgroup_kn_set_ugid(kn_subdir);
-	if (ret)
-		return ret;
-
-	ret = rdtgroup_add_files(kn_subdir, fflags);
-	if (!ret)
-		kernfs_activate(kn_subdir);
-
-	return ret;
-}
-
-static unsigned long fflags_from_resource(struct rdt_resource *r)
-{
-	switch (r->rid) {
-	case RDT_RESOURCE_L3:
-	case RDT_RESOURCE_L2:
-		return RFTYPE_RES_CACHE;
-	case RDT_RESOURCE_MBA:
-	case RDT_RESOURCE_SMBA:
-		return RFTYPE_RES_MB;
-	}
-
-	return WARN_ON_ONCE(1);
-}
-
-static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
-{
-	struct resctrl_schema *s;
-	struct rdt_resource *r;
-	unsigned long fflags;
-	char name[32];
-	int ret;
-
-	/* create the directory */
-	kn_info = kernfs_create_dir(parent_kn, "info", parent_kn->mode, NULL);
-	if (IS_ERR(kn_info))
-		return PTR_ERR(kn_info);
-
-	ret = rdtgroup_add_files(kn_info, RFTYPE_TOP_INFO);
-	if (ret)
-		goto out_destroy;
-
-	/* loop over enabled controls, these are all alloc_capable */
-	list_for_each_entry(s, &resctrl_schema_all, list) {
-		r = s->res;
-		fflags = fflags_from_resource(r) | RFTYPE_CTRL_INFO;
-		ret = rdtgroup_mkdir_info_resdir(s, s->name, fflags);
-		if (ret)
-			goto out_destroy;
-	}
-
-	for_each_mon_capable_rdt_resource(r) {
-		fflags = fflags_from_resource(r) | RFTYPE_MON_INFO;
-		sprintf(name, "%s_MON", r->name);
-		ret = rdtgroup_mkdir_info_resdir(r, name, fflags);
-		if (ret)
-			goto out_destroy;
-	}
-
-	ret = rdtgroup_kn_set_ugid(kn_info);
-	if (ret)
-		goto out_destroy;
-
-	kernfs_activate(kn_info);
-
-	return 0;
-
-out_destroy:
-	kernfs_remove(kn_info);
-	return ret;
-}
-
-static int
-mongroup_create_dir(struct kernfs_node *parent_kn, struct rdtgroup *prgrp,
-		    char *name, struct kernfs_node **dest_kn)
-{
-	struct kernfs_node *kn;
-	int ret;
-
-	/* create the directory */
-	kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp);
-	if (IS_ERR(kn))
-		return PTR_ERR(kn);
-
-	if (dest_kn)
-		*dest_kn = kn;
-
-	ret = rdtgroup_kn_set_ugid(kn);
-	if (ret)
-		goto out_destroy;
-
-	kernfs_activate(kn);
-
-	return 0;
-
-out_destroy:
-	kernfs_remove(kn);
-	return ret;
-}
-
-static void l3_qos_cfg_update(void *arg)
-{
-	bool *enable = arg;
-
-	wrmsrl(MSR_IA32_L3_QOS_CFG, *enable ? L3_QOS_CDP_ENABLE : 0ULL);
-}
-
-static void l2_qos_cfg_update(void *arg)
-{
-	bool *enable = arg;
-
-	wrmsrl(MSR_IA32_L2_QOS_CFG, *enable ? L2_QOS_CDP_ENABLE : 0ULL);
-}
-
-static inline bool is_mba_linear(void)
-{
-	return resctrl_arch_get_resource(RDT_RESOURCE_MBA)->membw.delay_linear;
-}
-
-static int set_cache_qos_cfg(int level, bool enable)
-{
-	void (*update)(void *arg);
-	struct rdt_ctrl_domain *d;
-	struct rdt_resource *r_l;
-	cpumask_var_t cpu_mask;
-	int cpu;
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	if (level == RDT_RESOURCE_L3)
-		update = l3_qos_cfg_update;
-	else if (level == RDT_RESOURCE_L2)
-		update = l2_qos_cfg_update;
-	else
-		return -EINVAL;
-
-	if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
-		return -ENOMEM;
-
-	r_l = &rdt_resources_all[level].r_resctrl;
-	list_for_each_entry(d, &r_l->ctrl_domains, hdr.list) {
-		if (r_l->cache.arch_has_per_cpu_cfg)
-			/* Pick all the CPUs in the domain instance */
-			for_each_cpu(cpu, &d->hdr.cpu_mask)
-				cpumask_set_cpu(cpu, cpu_mask);
-		else
-			/* Pick one CPU from each domain instance to update MSR */
-			cpumask_set_cpu(cpumask_any(&d->hdr.cpu_mask), cpu_mask);
-	}
-
-	/* Update QOS_CFG MSR on all the CPUs in cpu_mask */
-	on_each_cpu_mask(cpu_mask, update, &enable, 1);
-
-	free_cpumask_var(cpu_mask);
-
-	return 0;
-}
-
-/* Restore the qos cfg state when a domain comes online */
-void rdt_domain_reconfigure_cdp(struct rdt_resource *r)
-{
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-
-	if (!r->cdp_capable)
-		return;
-
-	if (r->rid == RDT_RESOURCE_L2)
-		l2_qos_cfg_update(&hw_res->cdp_enabled);
-
-	if (r->rid == RDT_RESOURCE_L3)
-		l3_qos_cfg_update(&hw_res->cdp_enabled);
-}
-
-static int mba_sc_domain_allocate(struct rdt_resource *r, struct rdt_ctrl_domain *d)
-{
-	u32 num_closid = resctrl_arch_get_num_closid(r);
-	int cpu = cpumask_any(&d->hdr.cpu_mask);
-	int i;
-
-	d->mbps_val = kcalloc_node(num_closid, sizeof(*d->mbps_val),
-				   GFP_KERNEL, cpu_to_node(cpu));
-	if (!d->mbps_val)
-		return -ENOMEM;
-
-	for (i = 0; i < num_closid; i++)
-		d->mbps_val[i] = MBA_MAX_MBPS;
-
-	return 0;
-}
-
-static void mba_sc_domain_destroy(struct rdt_resource *r,
-				  struct rdt_ctrl_domain *d)
-{
-	kfree(d->mbps_val);
-	d->mbps_val = NULL;
-}
-
-/*
- * MBA software controller is supported only if
- * MBM is supported and MBA is in linear scale,
- * and the MBM monitor scope is the same as MBA
- * control scope.
- */
-static bool supports_mba_mbps(void)
-{
-	struct rdt_resource *rmbm = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-
-	return (resctrl_is_mbm_enabled() &&
-		r->alloc_capable && is_mba_linear() &&
-		r->ctrl_scope == rmbm->mon_scope);
-}
-
-/*
- * Enable or disable the MBA software controller
- * which helps user specify bandwidth in MBps.
- */
-static int set_mba_sc(bool mba_sc)
-{
-	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
-	u32 num_closid = resctrl_arch_get_num_closid(r);
-	struct rdt_ctrl_domain *d;
-	unsigned long fflags;
-	int i;
-
-	if (!supports_mba_mbps() || mba_sc == is_mba_sc(r))
-		return -EINVAL;
-
-	r->membw.mba_sc = mba_sc;
-
-	rdtgroup_default.mba_mbps_event = mba_mbps_default_event;
-
-	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
-		for (i = 0; i < num_closid; i++)
-			d->mbps_val[i] = MBA_MAX_MBPS;
-	}
-
-	fflags = mba_sc ? RFTYPE_CTRL_BASE | RFTYPE_MON_BASE : 0;
-	resctrl_file_fflags_init("mba_MBps_event", fflags);
-
-	return 0;
-}
-
-static int cdp_enable(int level)
-{
-	struct rdt_resource *r_l = &rdt_resources_all[level].r_resctrl;
-	int ret;
-
-	if (!r_l->alloc_capable)
-		return -EINVAL;
-
-	ret = set_cache_qos_cfg(level, true);
-	if (!ret)
-		rdt_resources_all[level].cdp_enabled = true;
-
-	return ret;
-}
-
-static void cdp_disable(int level)
-{
-	struct rdt_hw_resource *r_hw = &rdt_resources_all[level];
-
-	if (r_hw->cdp_enabled) {
-		set_cache_qos_cfg(level, false);
-		r_hw->cdp_enabled = false;
-	}
-}
-
-int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable)
-{
-	struct rdt_hw_resource *hw_res = &rdt_resources_all[l];
-
-	if (!hw_res->r_resctrl.cdp_capable)
-		return -EINVAL;
-
-	if (enable)
-		return cdp_enable(l);
-
-	cdp_disable(l);
-
-	return 0;
-}
-
-bool resctrl_arch_get_cdp_enabled(enum resctrl_res_level l)
-{
-	return rdt_resources_all[l].cdp_enabled;
-}
-
-/*
- * We don't allow rdtgroup directories to be created anywhere
- * except the root directory. Thus when looking for the rdtgroup
- * structure for a kernfs node we are either looking at a directory,
- * in which case the rdtgroup structure is pointed at by the "priv"
- * field, otherwise we have a file, and need only look to the parent
- * to find the rdtgroup.
- */
-static struct rdtgroup *kernfs_to_rdtgroup(struct kernfs_node *kn)
-{
-	if (kernfs_type(kn) == KERNFS_DIR) {
-		/*
-		 * All the resource directories use "kn->priv"
-		 * to point to the "struct rdtgroup" for the
-		 * resource. "info" and its subdirectories don't
-		 * have rdtgroup structures, so return NULL here.
-		 */
-		if (kn == kn_info ||
-		    rcu_access_pointer(kn->__parent) == kn_info)
-			return NULL;
-		else
-			return kn->priv;
-	} else {
-		return rdt_kn_parent_priv(kn);
-	}
-}
-
-static void rdtgroup_kn_get(struct rdtgroup *rdtgrp, struct kernfs_node *kn)
-{
-	atomic_inc(&rdtgrp->waitcount);
-	kernfs_break_active_protection(kn);
-}
-
-static void rdtgroup_kn_put(struct rdtgroup *rdtgrp, struct kernfs_node *kn)
-{
-	if (atomic_dec_and_test(&rdtgrp->waitcount) &&
-	    (rdtgrp->flags & RDT_DELETED)) {
-		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
-		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)
-			rdtgroup_pseudo_lock_remove(rdtgrp);
-		kernfs_unbreak_active_protection(kn);
-		rdtgroup_remove(rdtgrp);
-	} else {
-		kernfs_unbreak_active_protection(kn);
-	}
-}
-
-struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn)
-{
-	struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn);
-
-	if (!rdtgrp)
-		return NULL;
-
-	rdtgroup_kn_get(rdtgrp, kn);
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	/* Was this group deleted while we waited? */
-	if (rdtgrp->flags & RDT_DELETED)
-		return NULL;
-
-	return rdtgrp;
-}
-
-void rdtgroup_kn_unlock(struct kernfs_node *kn)
-{
-	struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn);
-
-	if (!rdtgrp)
-		return;
-
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-
-	rdtgroup_kn_put(rdtgrp, kn);
-}
-
-static int mkdir_mondata_all(struct kernfs_node *parent_kn,
-			     struct rdtgroup *prgrp,
-			     struct kernfs_node **mon_data_kn);
-
-static void rdt_disable_ctx(void)
-{
-	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
-	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
-	set_mba_sc(false);
-
-	resctrl_debug = false;
-}
-
-static int rdt_enable_ctx(struct rdt_fs_context *ctx)
-{
-	int ret = 0;
-
-	if (ctx->enable_cdpl2) {
-		ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, true);
-		if (ret)
-			goto out_done;
-	}
-
-	if (ctx->enable_cdpl3) {
-		ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, true);
-		if (ret)
-			goto out_cdpl2;
-	}
-
-	if (ctx->enable_mba_mbps) {
-		ret = set_mba_sc(true);
-		if (ret)
-			goto out_cdpl3;
-	}
-
-	if (ctx->enable_debug)
-		resctrl_debug = true;
-
-	return 0;
-
-out_cdpl3:
-	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
-out_cdpl2:
-	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
-out_done:
-	return ret;
-}
-
-static int schemata_list_add(struct rdt_resource *r, enum resctrl_conf_type type)
-{
-	struct resctrl_schema *s;
-	const char *suffix = "";
-	int ret, cl;
-
-	s = kzalloc(sizeof(*s), GFP_KERNEL);
-	if (!s)
-		return -ENOMEM;
-
-	s->res = r;
-	s->num_closid = resctrl_arch_get_num_closid(r);
-	if (resctrl_arch_get_cdp_enabled(r->rid))
-		s->num_closid /= 2;
-
-	s->conf_type = type;
-	switch (type) {
-	case CDP_CODE:
-		suffix = "CODE";
-		break;
-	case CDP_DATA:
-		suffix = "DATA";
-		break;
-	case CDP_NONE:
-		suffix = "";
-		break;
-	}
-
-	ret = snprintf(s->name, sizeof(s->name), "%s%s", r->name, suffix);
-	if (ret >= sizeof(s->name)) {
-		kfree(s);
-		return -EINVAL;
-	}
-
-	cl = strlen(s->name);
-
-	/*
-	 * If CDP is supported by this resource, but not enabled,
-	 * include the suffix. This ensures the tabular format of the
-	 * schemata file does not change between mounts of the filesystem.
-	 */
-	if (r->cdp_capable && !resctrl_arch_get_cdp_enabled(r->rid))
-		cl += 4;
-
-	if (cl > max_name_width)
-		max_name_width = cl;
-
-	switch (r->schema_fmt) {
-	case RESCTRL_SCHEMA_BITMAP:
-		s->fmt_str = "%d=%x";
-		break;
-	case RESCTRL_SCHEMA_RANGE:
-		s->fmt_str = "%d=%u";
-		break;
-	}
-
-	if (WARN_ON_ONCE(!s->fmt_str)) {
-		kfree(s);
-		return -EINVAL;
-	}
-
-	INIT_LIST_HEAD(&s->list);
-	list_add(&s->list, &resctrl_schema_all);
-
-	return 0;
-}
-
-static int schemata_list_create(void)
-{
-	struct rdt_resource *r;
-	int ret = 0;
-
-	for_each_alloc_capable_rdt_resource(r) {
-		if (resctrl_arch_get_cdp_enabled(r->rid)) {
-			ret = schemata_list_add(r, CDP_CODE);
-			if (ret)
-				break;
-
-			ret = schemata_list_add(r, CDP_DATA);
-		} else {
-			ret = schemata_list_add(r, CDP_NONE);
-		}
-
-		if (ret)
-			break;
-	}
-
-	return ret;
-}
-
-static void schemata_list_destroy(void)
-{
-	struct resctrl_schema *s, *tmp;
-
-	list_for_each_entry_safe(s, tmp, &resctrl_schema_all, list) {
-		list_del(&s->list);
-		kfree(s);
-	}
-}
-
-static int rdt_get_tree(struct fs_context *fc)
-{
-	struct rdt_fs_context *ctx = rdt_fc2context(fc);
-	unsigned long flags = RFTYPE_CTRL_BASE;
-	struct rdt_mon_domain *dom;
-	struct rdt_resource *r;
-	int ret;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-	/*
-	 * resctrl file system can only be mounted once.
-	 */
-	if (resctrl_mounted) {
-		ret = -EBUSY;
-		goto out;
-	}
-
-	ret = rdtgroup_setup_root(ctx);
-	if (ret)
-		goto out;
-
-	ret = rdt_enable_ctx(ctx);
-	if (ret)
-		goto out_root;
-
-	ret = schemata_list_create();
-	if (ret) {
-		schemata_list_destroy();
-		goto out_ctx;
-	}
-
-	ret = closid_init();
-	if (ret)
-		goto out_schemata_free;
-
-	if (resctrl_arch_mon_capable())
-		flags |= RFTYPE_MON;
-
-	ret = rdtgroup_add_files(rdtgroup_default.kn, flags);
-	if (ret)
-		goto out_closid_exit;
-
-	kernfs_activate(rdtgroup_default.kn);
-
-	ret = rdtgroup_create_info_dir(rdtgroup_default.kn);
-	if (ret < 0)
-		goto out_closid_exit;
-
-	if (resctrl_arch_mon_capable()) {
-		ret = mongroup_create_dir(rdtgroup_default.kn,
-					  &rdtgroup_default, "mon_groups",
-					  &kn_mongrp);
-		if (ret < 0)
-			goto out_info;
-
-		ret = mkdir_mondata_all(rdtgroup_default.kn,
-					&rdtgroup_default, &kn_mondata);
-		if (ret < 0)
-			goto out_mongrp;
-		rdtgroup_default.mon.mon_data_kn = kn_mondata;
-	}
-
-	ret = rdt_pseudo_lock_init();
-	if (ret)
-		goto out_mondata;
-
-	ret = kernfs_get_tree(fc);
-	if (ret < 0)
-		goto out_psl;
-
-	if (resctrl_arch_alloc_capable())
-		resctrl_arch_enable_alloc();
-	if (resctrl_arch_mon_capable())
-		resctrl_arch_enable_mon();
-
-	if (resctrl_arch_alloc_capable() || resctrl_arch_mon_capable())
-		resctrl_mounted = true;
-
-	if (resctrl_is_mbm_enabled()) {
-		r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-		list_for_each_entry(dom, &r->mon_domains, hdr.list)
-			mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL,
-						   RESCTRL_PICK_ANY_CPU);
-	}
-
-	goto out;
-
-out_psl:
-	rdt_pseudo_lock_release();
-out_mondata:
-	if (resctrl_arch_mon_capable())
-		kernfs_remove(kn_mondata);
-out_mongrp:
-	if (resctrl_arch_mon_capable())
-		kernfs_remove(kn_mongrp);
-out_info:
-	kernfs_remove(kn_info);
-out_closid_exit:
-	closid_exit();
-out_schemata_free:
-	schemata_list_destroy();
-out_ctx:
-	rdt_disable_ctx();
-out_root:
-	rdtgroup_destroy_root();
-out:
-	rdt_last_cmd_clear();
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-	return ret;
-}
-
-enum rdt_param {
-	Opt_cdp,
-	Opt_cdpl2,
-	Opt_mba_mbps,
-	Opt_debug,
-	nr__rdt_params
-};
-
-static const struct fs_parameter_spec rdt_fs_parameters[] = {
-	fsparam_flag("cdp",		Opt_cdp),
-	fsparam_flag("cdpl2",		Opt_cdpl2),
-	fsparam_flag("mba_MBps",	Opt_mba_mbps),
-	fsparam_flag("debug",		Opt_debug),
-	{}
-};
-
-static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
-{
-	struct rdt_fs_context *ctx = rdt_fc2context(fc);
-	struct fs_parse_result result;
-	const char *msg;
-	int opt;
-
-	opt = fs_parse(fc, rdt_fs_parameters, param, &result);
-	if (opt < 0)
-		return opt;
-
-	switch (opt) {
-	case Opt_cdp:
-		ctx->enable_cdpl3 = true;
-		return 0;
-	case Opt_cdpl2:
-		ctx->enable_cdpl2 = true;
-		return 0;
-	case Opt_mba_mbps:
-		msg = "mba_MBps requires MBM and linear scale MBA at L3 scope";
-		if (!supports_mba_mbps())
-			return invalfc(fc, msg);
-		ctx->enable_mba_mbps = true;
-		return 0;
-	case Opt_debug:
-		ctx->enable_debug = true;
-		return 0;
-	}
-
-	return -EINVAL;
-}
-
-static void rdt_fs_context_free(struct fs_context *fc)
-{
-	struct rdt_fs_context *ctx = rdt_fc2context(fc);
-
-	kernfs_free_fs_context(fc);
-	kfree(ctx);
-}
-
-static const struct fs_context_operations rdt_fs_context_ops = {
-	.free		= rdt_fs_context_free,
-	.parse_param	= rdt_parse_param,
-	.get_tree	= rdt_get_tree,
-};
-
-static int rdt_init_fs_context(struct fs_context *fc)
-{
-	struct rdt_fs_context *ctx;
-
-	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
-	if (!ctx)
-		return -ENOMEM;
-
-	ctx->kfc.magic = RDTGROUP_SUPER_MAGIC;
-	fc->fs_private = &ctx->kfc;
-	fc->ops = &rdt_fs_context_ops;
-	put_user_ns(fc->user_ns);
-	fc->user_ns = get_user_ns(&init_user_ns);
-	fc->global = true;
-	return 0;
-}
-
-void resctrl_arch_reset_all_ctrls(struct rdt_resource *r)
-{
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
-	struct rdt_hw_ctrl_domain *hw_dom;
-	struct msr_param msr_param;
-	struct rdt_ctrl_domain *d;
-	int i;
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	msr_param.res = r;
-	msr_param.low = 0;
-	msr_param.high = hw_res->num_closid;
-
-	/*
-	 * Disable resource control for this resource by setting all
-	 * CBMs in all ctrl_domains to the maximum mask value. Pick one CPU
-	 * from each domain to update the MSRs below.
-	 */
-	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
-		hw_dom = resctrl_to_arch_ctrl_dom(d);
-
-		for (i = 0; i < hw_res->num_closid; i++)
-			hw_dom->ctrl_val[i] = resctrl_get_default_ctrl(r);
-		msr_param.dom = d;
-		smp_call_function_any(&d->hdr.cpu_mask, rdt_ctrl_update, &msr_param, 1);
-	}
-
-	return;
-}
-
-/*
- * Move tasks from one to the other group. If @from is NULL, then all tasks
- * in the systems are moved unconditionally (used for teardown).
- *
- * If @mask is not NULL the cpus on which moved tasks are running are set
- * in that mask so the update smp function call is restricted to affected
- * cpus.
- */
-static void rdt_move_group_tasks(struct rdtgroup *from, struct rdtgroup *to,
-				 struct cpumask *mask)
-{
-	struct task_struct *p, *t;
-
-	read_lock(&tasklist_lock);
-	for_each_process_thread(p, t) {
-		if (!from || is_closid_match(t, from) ||
-		    is_rmid_match(t, from)) {
-			resctrl_arch_set_closid_rmid(t, to->closid,
-						     to->mon.rmid);
-
-			/*
-			 * Order the closid/rmid stores above before the loads
-			 * in task_curr(). This pairs with the full barrier
-			 * between the rq->curr update and
-			 * resctrl_arch_sched_in() during context switch.
-			 */
-			smp_mb();
-
-			/*
-			 * If the task is on a CPU, set the CPU in the mask.
-			 * The detection is inaccurate as tasks might move or
-			 * schedule before the smp function call takes place.
-			 * In such a case the function call is pointless, but
-			 * there is no other side effect.
-			 */
-			if (IS_ENABLED(CONFIG_SMP) && mask && task_curr(t))
-				cpumask_set_cpu(task_cpu(t), mask);
-		}
-	}
-	read_unlock(&tasklist_lock);
-}
-
-static void free_all_child_rdtgrp(struct rdtgroup *rdtgrp)
-{
-	struct rdtgroup *sentry, *stmp;
-	struct list_head *head;
-
-	head = &rdtgrp->mon.crdtgrp_list;
-	list_for_each_entry_safe(sentry, stmp, head, mon.crdtgrp_list) {
-		free_rmid(sentry->closid, sentry->mon.rmid);
-		list_del(&sentry->mon.crdtgrp_list);
-
-		if (atomic_read(&sentry->waitcount) != 0)
-			sentry->flags = RDT_DELETED;
-		else
-			rdtgroup_remove(sentry);
-	}
-}
-
-/*
- * Forcibly remove all of subdirectories under root.
- */
-static void rmdir_all_sub(void)
-{
-	struct rdtgroup *rdtgrp, *tmp;
-
-	/* Move all tasks to the default resource group */
-	rdt_move_group_tasks(NULL, &rdtgroup_default, NULL);
-
-	list_for_each_entry_safe(rdtgrp, tmp, &rdt_all_groups, rdtgroup_list) {
-		/* Free any child rmids */
-		free_all_child_rdtgrp(rdtgrp);
-
-		/* Remove each rdtgroup other than root */
-		if (rdtgrp == &rdtgroup_default)
-			continue;
-
-		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
-		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)
-			rdtgroup_pseudo_lock_remove(rdtgrp);
-
-		/*
-		 * Give any CPUs back to the default group. We cannot copy
-		 * cpu_online_mask because a CPU might have executed the
-		 * offline callback already, but is still marked online.
-		 */
-		cpumask_or(&rdtgroup_default.cpu_mask,
-			   &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);
-
-		free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
-
-		kernfs_remove(rdtgrp->kn);
-		list_del(&rdtgrp->rdtgroup_list);
-
-		if (atomic_read(&rdtgrp->waitcount) != 0)
-			rdtgrp->flags = RDT_DELETED;
-		else
-			rdtgroup_remove(rdtgrp);
-	}
-	/* Notify online CPUs to update per cpu storage and PQR_ASSOC MSR */
-	update_closid_rmid(cpu_online_mask, &rdtgroup_default);
-
-	kernfs_remove(kn_info);
-	kernfs_remove(kn_mongrp);
-	kernfs_remove(kn_mondata);
-}
-
-/**
- * mon_get_kn_priv() - Get the mon_data priv data for this event.
- *
- * The same values are used across the mon_data directories of all control and
- * monitor groups for the same event in the same domain. Keep a list of
- * allocated structures and re-use an existing one with the same values for
- * @rid, @domid, etc.
- *
- * @rid:    The resource id for the event file being created.
- * @domid:  The domain id for the event file being created.
- * @mevt:   The type of event file being created.
- * @do_sum: Whether SNC summing monitors are being created.
- */
-static struct mon_data *mon_get_kn_priv(enum resctrl_res_level rid, int domid,
-					struct mon_evt *mevt,
-					bool do_sum)
-{
-	struct mon_data *priv;
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	list_for_each_entry(priv, &mon_data_kn_priv_list, list) {
-		if (priv->rid == rid && priv->domid == domid &&
-		    priv->sum == do_sum && priv->evtid == mevt->evtid)
-			return priv;
-	}
-
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return NULL;
-
-	priv->rid = rid;
-	priv->domid = domid;
-	priv->sum = do_sum;
-	priv->evtid = mevt->evtid;
-	list_add_tail(&priv->list, &mon_data_kn_priv_list);
-
-	return priv;
-}
-
-/**
- * mon_put_kn_priv() - Free all allocated mon_data structures.
- *
- * Called when resctrl file system is unmounted.
- */
-static void mon_put_kn_priv(void)
-{
-	struct mon_data *priv, *tmp;
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	list_for_each_entry_safe(priv, tmp, &mon_data_kn_priv_list, list) {
-		list_del(&priv->list);
-		kfree(priv);
-	}
-}
-
-static void resctrl_fs_teardown(void)
-{
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	/* Cleared by rdtgroup_destroy_root() */
-	if (!rdtgroup_default.kn)
-		return;
-
-	rmdir_all_sub();
-	mon_put_kn_priv();
-	rdt_pseudo_lock_release();
-	rdtgroup_default.mode = RDT_MODE_SHAREABLE;
-	closid_exit();
-	schemata_list_destroy();
-	rdtgroup_destroy_root();
-}
-
-static void rdt_kill_sb(struct super_block *sb)
-{
-	struct rdt_resource *r;
-
-	cpus_read_lock();
-	mutex_lock(&rdtgroup_mutex);
-
-	rdt_disable_ctx();
-
-	/* Put everything back to default values. */
-	for_each_alloc_capable_rdt_resource(r)
-		resctrl_arch_reset_all_ctrls(r);
-
-	resctrl_fs_teardown();
-	if (resctrl_arch_alloc_capable())
-		resctrl_arch_disable_alloc();
-	if (resctrl_arch_mon_capable())
-		resctrl_arch_disable_mon();
-	resctrl_mounted = false;
-	kernfs_kill_sb(sb);
-	mutex_unlock(&rdtgroup_mutex);
-	cpus_read_unlock();
-}
-
-static struct file_system_type rdt_fs_type = {
-	.name			= "resctrl",
-	.init_fs_context	= rdt_init_fs_context,
-	.parameters		= rdt_fs_parameters,
-	.kill_sb		= rdt_kill_sb,
-};
-
-static int mon_addfile(struct kernfs_node *parent_kn, const char *name,
-		       void *priv)
-{
-	struct kernfs_node *kn;
-	int ret = 0;
-
-	kn = __kernfs_create_file(parent_kn, name, 0444,
-				  GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, 0,
-				  &kf_mondata_ops, priv, NULL, NULL);
-	if (IS_ERR(kn))
-		return PTR_ERR(kn);
-
-	ret = rdtgroup_kn_set_ugid(kn);
-	if (ret) {
-		kernfs_remove(kn);
-		return ret;
-	}
-
-	return ret;
-}
-
-static void mon_rmdir_one_subdir(struct kernfs_node *pkn, char *name, char *subname)
-{
-	struct kernfs_node *kn;
-
-	kn = kernfs_find_and_get(pkn, name);
-	if (!kn)
-		return;
-	kernfs_put(kn);
-
-	if (kn->dir.subdirs <= 1)
-		kernfs_remove(kn);
-	else
-		kernfs_remove_by_name(kn, subname);
-}
-
-/*
- * Remove all subdirectories of mon_data of ctrl_mon groups
- * and monitor groups for the given domain.
- * Remove files and directories containing "sum" of domain data
- * when last domain being summed is removed.
- */
-static void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
-					   struct rdt_mon_domain *d)
-{
-	struct rdtgroup *prgrp, *crgrp;
-	char subname[32];
-	bool snc_mode;
-	char name[32];
-
-	snc_mode = r->mon_scope == RESCTRL_L3_NODE;
-	sprintf(name, "mon_%s_%02d", r->name, snc_mode ? d->ci->id : d->hdr.id);
-	if (snc_mode)
-		sprintf(subname, "mon_sub_%s_%02d", r->name, d->hdr.id);
-
-	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
-		mon_rmdir_one_subdir(prgrp->mon.mon_data_kn, name, subname);
-
-		list_for_each_entry(crgrp, &prgrp->mon.crdtgrp_list, mon.crdtgrp_list)
-			mon_rmdir_one_subdir(crgrp->mon.mon_data_kn, name, subname);
-	}
-}
-
-static int mon_add_all_files(struct kernfs_node *kn, struct rdt_mon_domain *d,
-			     struct rdt_resource *r, struct rdtgroup *prgrp,
-			     bool do_sum)
-{
-	struct rmid_read rr = {0};
-	struct mon_data *priv;
-	struct mon_evt *mevt;
-	int ret, domid;
-
-	if (WARN_ON(list_empty(&r->evt_list)))
-		return -EPERM;
-
-	list_for_each_entry(mevt, &r->evt_list, list) {
-		domid = do_sum ? d->ci->id : d->hdr.id;
-		priv = mon_get_kn_priv(r->rid, domid, mevt, do_sum);
-		if (WARN_ON_ONCE(!priv))
-			return -EINVAL;
-
-		ret = mon_addfile(kn, mevt->name, priv);
-		if (ret)
-			return ret;
-
-		if (!do_sum && resctrl_is_mbm_event(mevt->evtid))
-			mon_event_read(&rr, r, d, prgrp, &d->hdr.cpu_mask, mevt->evtid, true);
-	}
-
-	return 0;
-}
-
-static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
-				struct rdt_mon_domain *d,
-				struct rdt_resource *r, struct rdtgroup *prgrp)
-{
-	struct kernfs_node *kn, *ckn;
-	char name[32];
-	bool snc_mode;
-	int ret = 0;
-
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	snc_mode = r->mon_scope == RESCTRL_L3_NODE;
-	sprintf(name, "mon_%s_%02d", r->name, snc_mode ? d->ci->id : d->hdr.id);
-	kn = kernfs_find_and_get(parent_kn, name);
-	if (kn) {
-		/*
-		 * rdtgroup_mutex will prevent this directory from being
-		 * removed. No need to keep this hold.
-		 */
-		kernfs_put(kn);
-	} else {
-		kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp);
-		if (IS_ERR(kn))
-			return PTR_ERR(kn);
-
-		ret = rdtgroup_kn_set_ugid(kn);
-		if (ret)
-			goto out_destroy;
-		ret = mon_add_all_files(kn, d, r, prgrp, snc_mode);
-		if (ret)
-			goto out_destroy;
-	}
-
-	if (snc_mode) {
-		sprintf(name, "mon_sub_%s_%02d", r->name, d->hdr.id);
-		ckn = kernfs_create_dir(kn, name, parent_kn->mode, prgrp);
-		if (IS_ERR(ckn)) {
-			ret = -EINVAL;
-			goto out_destroy;
-		}
-
-		ret = rdtgroup_kn_set_ugid(ckn);
-		if (ret)
-			goto out_destroy;
-
-		ret = mon_add_all_files(ckn, d, r, prgrp, false);
-		if (ret)
-			goto out_destroy;
-	}
-
-	kernfs_activate(kn);
-	return 0;
-
-out_destroy:
-	kernfs_remove(kn);
-	return ret;
-}
-
-/*
- * Add all subdirectories of mon_data for "ctrl_mon" groups
- * and "monitor" groups with given domain id.
- */
-static void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
-					   struct rdt_mon_domain *d)
-{
-	struct kernfs_node *parent_kn;
-	struct rdtgroup *prgrp, *crgrp;
-	struct list_head *head;
-
-	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
-		parent_kn = prgrp->mon.mon_data_kn;
-		mkdir_mondata_subdir(parent_kn, d, r, prgrp);
-
-		head = &prgrp->mon.crdtgrp_list;
-		list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
-			parent_kn = crgrp->mon.mon_data_kn;
-			mkdir_mondata_subdir(parent_kn, d, r, crgrp);
-		}
-	}
-}
-
-static int mkdir_mondata_subdir_alldom(struct kernfs_node *parent_kn,
-				       struct rdt_resource *r,
-				       struct rdtgroup *prgrp)
-{
-	struct rdt_mon_domain *dom;
-	int ret;
-
-	/* Walking r->domains, ensure it can't race with cpuhp */
-	lockdep_assert_cpus_held();
-
-	list_for_each_entry(dom, &r->mon_domains, hdr.list) {
-		ret = mkdir_mondata_subdir(parent_kn, dom, r, prgrp);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
-/*
- * This creates a directory mon_data which contains the monitored data.
- *
- * mon_data has one directory for each domain which are named
- * in the format mon_<domain_name>_<domain_id>. For ex: A mon_data
- * with L3 domain looks as below:
- * ./mon_data:
- * mon_L3_00
- * mon_L3_01
- * mon_L3_02
- * ...
- *
- * Each domain directory has one file per event:
- * ./mon_L3_00/:
- * llc_occupancy
- *
- */
-static int mkdir_mondata_all(struct kernfs_node *parent_kn,
-			     struct rdtgroup *prgrp,
-			     struct kernfs_node **dest_kn)
-{
-	struct rdt_resource *r;
-	struct kernfs_node *kn;
-	int ret;
-
-	/*
-	 * Create the mon_data directory first.
-	 */
-	ret = mongroup_create_dir(parent_kn, prgrp, "mon_data", &kn);
-	if (ret)
-		return ret;
-
-	if (dest_kn)
-		*dest_kn = kn;
-
-	/*
-	 * Create the subdirectories for each domain. Note that all events
-	 * in a domain like L3 are grouped into a resource whose domain is L3
-	 */
-	for_each_mon_capable_rdt_resource(r) {
-		ret = mkdir_mondata_subdir_alldom(kn, r, prgrp);
-		if (ret)
-			goto out_destroy;
-	}
-
-	return 0;
-
-out_destroy:
-	kernfs_remove(kn);
-	return ret;
-}
-
-/**
- * cbm_ensure_valid - Enforce validity on provided CBM
- * @_val:	Candidate CBM
- * @r:		RDT resource to which the CBM belongs
- *
- * The provided CBM represents all cache portions available for use. This
- * may be represented by a bitmap that does not consist of contiguous ones
- * and thus be an invalid CBM.
- * Here the provided CBM is forced to be a valid CBM by only considering
- * the first set of contiguous bits as valid and clearing all bits.
- * The intention here is to provide a valid default CBM with which a new
- * resource group is initialized. The user can follow this with a
- * modification to the CBM if the default does not satisfy the
- * requirements.
- */
-static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
-{
-	unsigned int cbm_len = r->cache.cbm_len;
-	unsigned long first_bit, zero_bit;
-	unsigned long val = _val;
-
-	if (!val)
-		return 0;
-
-	first_bit = find_first_bit(&val, cbm_len);
-	zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
-
-	/* Clear any remaining bits to ensure contiguous region */
-	bitmap_clear(&val, zero_bit, cbm_len - zero_bit);
-	return (u32)val;
-}
-
-/*
- * Initialize cache resources per RDT domain
- *
- * Set the RDT domain up to start off with all usable allocations. That is,
- * all shareable and unused bits. All-zero CBM is invalid.
- */
-static int __init_one_rdt_domain(struct rdt_ctrl_domain *d, struct resctrl_schema *s,
-				 u32 closid)
-{
-	enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
-	enum resctrl_conf_type t = s->conf_type;
-	struct resctrl_staged_config *cfg;
-	struct rdt_resource *r = s->res;
-	u32 used_b = 0, unused_b = 0;
-	unsigned long tmp_cbm;
-	enum rdtgrp_mode mode;
-	u32 peer_ctl, ctrl_val;
-	int i;
-
-	cfg = &d->staged_config[t];
-	cfg->have_new_ctrl = false;
-	cfg->new_ctrl = r->cache.shareable_bits;
-	used_b = r->cache.shareable_bits;
-	for (i = 0; i < closids_supported(); i++) {
-		if (closid_allocated(i) && i != closid) {
-			mode = rdtgroup_mode_by_closid(i);
-			if (mode == RDT_MODE_PSEUDO_LOCKSETUP)
-				/*
-				 * ctrl values for locksetup aren't relevant
-				 * until the schemata is written, and the mode
-				 * becomes RDT_MODE_PSEUDO_LOCKED.
-				 */
-				continue;
-			/*
-			 * If CDP is active include peer domain's
-			 * usage to ensure there is no overlap
-			 * with an exclusive group.
-			 */
-			if (resctrl_arch_get_cdp_enabled(r->rid))
-				peer_ctl = resctrl_arch_get_config(r, d, i,
-								   peer_type);
-			else
-				peer_ctl = 0;
-			ctrl_val = resctrl_arch_get_config(r, d, i,
-							   s->conf_type);
-			used_b |= ctrl_val | peer_ctl;
-			if (mode == RDT_MODE_SHAREABLE)
-				cfg->new_ctrl |= ctrl_val | peer_ctl;
-		}
-	}
-	if (d->plr && d->plr->cbm > 0)
-		used_b |= d->plr->cbm;
-	unused_b = used_b ^ (BIT_MASK(r->cache.cbm_len) - 1);
-	unused_b &= BIT_MASK(r->cache.cbm_len) - 1;
-	cfg->new_ctrl |= unused_b;
-	/*
-	 * Force the initial CBM to be valid, user can
-	 * modify the CBM based on system availability.
-	 */
-	cfg->new_ctrl = cbm_ensure_valid(cfg->new_ctrl, r);
-	/*
-	 * Assign the u32 CBM to an unsigned long to ensure that
-	 * bitmap_weight() does not access out-of-bound memory.
-	 */
-	tmp_cbm = cfg->new_ctrl;
-	if (bitmap_weight(&tmp_cbm, r->cache.cbm_len) < r->cache.min_cbm_bits) {
-		rdt_last_cmd_printf("No space on %s:%d\n", s->name, d->hdr.id);
-		return -ENOSPC;
-	}
-	cfg->have_new_ctrl = true;
-
-	return 0;
-}
-
-/*
- * Initialize cache resources with default values.
- *
- * A new RDT group is being created on an allocation capable (CAT)
- * supporting system. Set this group up to start off with all usable
- * allocations.
- *
- * If there are no more shareable bits available on any domain then
- * the entire allocation will fail.
- */
-static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
-{
-	struct rdt_ctrl_domain *d;
-	int ret;
-
-	list_for_each_entry(d, &s->res->ctrl_domains, hdr.list) {
-		ret = __init_one_rdt_domain(d, s, closid);
-		if (ret < 0)
-			return ret;
-	}
-
-	return 0;
-}
-
-/* Initialize MBA resource with default values. */
-static void rdtgroup_init_mba(struct rdt_resource *r, u32 closid)
-{
-	struct resctrl_staged_config *cfg;
-	struct rdt_ctrl_domain *d;
-
-	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
-		if (is_mba_sc(r)) {
-			d->mbps_val[closid] = MBA_MAX_MBPS;
-			continue;
-		}
-
-		cfg = &d->staged_config[CDP_NONE];
-		cfg->new_ctrl = resctrl_get_default_ctrl(r);
-		cfg->have_new_ctrl = true;
-	}
-}
-
-/* Initialize the RDT group's allocations. */
-static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
-{
-	struct resctrl_schema *s;
-	struct rdt_resource *r;
-	int ret = 0;
-
-	rdt_staged_configs_clear();
-
-	list_for_each_entry(s, &resctrl_schema_all, list) {
-		r = s->res;
-		if (r->rid == RDT_RESOURCE_MBA ||
-		    r->rid == RDT_RESOURCE_SMBA) {
-			rdtgroup_init_mba(r, rdtgrp->closid);
-			if (is_mba_sc(r))
-				continue;
-		} else {
-			ret = rdtgroup_init_cat(s, rdtgrp->closid);
-			if (ret < 0)
-				goto out;
-		}
-
-		ret = resctrl_arch_update_domains(r, rdtgrp->closid);
-		if (ret < 0) {
-			rdt_last_cmd_puts("Failed to initialize allocations\n");
-			goto out;
-		}
-	}
-
-	rdtgrp->mode = RDT_MODE_SHAREABLE;
-
-out:
-	rdt_staged_configs_clear();
-	return ret;
-}
-
-static int mkdir_rdt_prepare_rmid_alloc(struct rdtgroup *rdtgrp)
-{
-	int ret;
-
-	if (!resctrl_arch_mon_capable())
-		return 0;
-
-	ret = alloc_rmid(rdtgrp->closid);
-	if (ret < 0) {
-		rdt_last_cmd_puts("Out of RMIDs\n");
-		return ret;
-	}
-	rdtgrp->mon.rmid = ret;
-
-	ret = mkdir_mondata_all(rdtgrp->kn, rdtgrp, &rdtgrp->mon.mon_data_kn);
-	if (ret) {
-		rdt_last_cmd_puts("kernfs subdir error\n");
-		free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
-		return ret;
-	}
-
-	return 0;
-}
-
-static void mkdir_rdt_prepare_rmid_free(struct rdtgroup *rgrp)
-{
-	if (resctrl_arch_mon_capable())
-		free_rmid(rgrp->closid, rgrp->mon.rmid);
-}
-
-/*
- * We allow creating mon groups only with in a directory called "mon_groups"
- * which is present in every ctrl_mon group. Check if this is a valid
- * "mon_groups" directory.
- *
- * 1. The directory should be named "mon_groups".
- * 2. The mon group itself should "not" be named "mon_groups".
- *   This makes sure "mon_groups" directory always has a ctrl_mon group
- *   as parent.
- */
-static bool is_mon_groups(struct kernfs_node *kn, const char *name)
-{
-	return (!strcmp(rdt_kn_name(kn), "mon_groups") &&
-		strcmp(name, "mon_groups"));
-}
-
-static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
-			     const char *name, umode_t mode,
-			     enum rdt_group_type rtype, struct rdtgroup **r)
-{
-	struct rdtgroup *prdtgrp, *rdtgrp;
-	unsigned long files = 0;
-	struct kernfs_node *kn;
-	int ret;
-
-	prdtgrp = rdtgroup_kn_lock_live(parent_kn);
-	if (!prdtgrp) {
-		ret = -ENODEV;
-		goto out_unlock;
-	}
-
-	/*
-	 * Check that the parent directory for a monitor group is a "mon_groups"
-	 * directory.
-	 */
-	if (rtype == RDTMON_GROUP && !is_mon_groups(parent_kn, name)) {
-		ret = -EPERM;
-		goto out_unlock;
-	}
-
-	if (rtype == RDTMON_GROUP &&
-	    (prdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
-	     prdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)) {
-		ret = -EINVAL;
-		rdt_last_cmd_puts("Pseudo-locking in progress\n");
-		goto out_unlock;
-	}
-
-	/* allocate the rdtgroup. */
-	rdtgrp = kzalloc(sizeof(*rdtgrp), GFP_KERNEL);
-	if (!rdtgrp) {
-		ret = -ENOSPC;
-		rdt_last_cmd_puts("Kernel out of memory\n");
-		goto out_unlock;
-	}
-	*r = rdtgrp;
-	rdtgrp->mon.parent = prdtgrp;
-	rdtgrp->type = rtype;
-	INIT_LIST_HEAD(&rdtgrp->mon.crdtgrp_list);
-
-	/* kernfs creates the directory for rdtgrp */
-	kn = kernfs_create_dir(parent_kn, name, mode, rdtgrp);
-	if (IS_ERR(kn)) {
-		ret = PTR_ERR(kn);
-		rdt_last_cmd_puts("kernfs create error\n");
-		goto out_free_rgrp;
-	}
-	rdtgrp->kn = kn;
-
-	/*
-	 * kernfs_remove() will drop the reference count on "kn" which
-	 * will free it. But we still need it to stick around for the
-	 * rdtgroup_kn_unlock(kn) call. Take one extra reference here,
-	 * which will be dropped by kernfs_put() in rdtgroup_remove().
-	 */
-	kernfs_get(kn);
-
-	ret = rdtgroup_kn_set_ugid(kn);
-	if (ret) {
-		rdt_last_cmd_puts("kernfs perm error\n");
-		goto out_destroy;
-	}
-
-	if (rtype == RDTCTRL_GROUP) {
-		files = RFTYPE_BASE | RFTYPE_CTRL;
-		if (resctrl_arch_mon_capable())
-			files |= RFTYPE_MON;
-	} else {
-		files = RFTYPE_BASE | RFTYPE_MON;
-	}
-
-	ret = rdtgroup_add_files(kn, files);
-	if (ret) {
-		rdt_last_cmd_puts("kernfs fill error\n");
-		goto out_destroy;
-	}
-
-	/*
-	 * The caller unlocks the parent_kn upon success.
-	 */
-	return 0;
-
-out_destroy:
-	kernfs_put(rdtgrp->kn);
-	kernfs_remove(rdtgrp->kn);
-out_free_rgrp:
-	kfree(rdtgrp);
-out_unlock:
-	rdtgroup_kn_unlock(parent_kn);
-	return ret;
-}
-
-static void mkdir_rdt_prepare_clean(struct rdtgroup *rgrp)
-{
-	kernfs_remove(rgrp->kn);
-	rdtgroup_remove(rgrp);
-}
-
-/*
- * Create a monitor group under "mon_groups" directory of a control
- * and monitor group(ctrl_mon). This is a resource group
- * to monitor a subset of tasks and cpus in its parent ctrl_mon group.
- */
-static int rdtgroup_mkdir_mon(struct kernfs_node *parent_kn,
-			      const char *name, umode_t mode)
-{
-	struct rdtgroup *rdtgrp, *prgrp;
-	int ret;
-
-	ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTMON_GROUP, &rdtgrp);
-	if (ret)
-		return ret;
-
-	prgrp = rdtgrp->mon.parent;
-	rdtgrp->closid = prgrp->closid;
-
-	ret = mkdir_rdt_prepare_rmid_alloc(rdtgrp);
-	if (ret) {
-		mkdir_rdt_prepare_clean(rdtgrp);
-		goto out_unlock;
-	}
-
-	kernfs_activate(rdtgrp->kn);
-
-	/*
-	 * Add the rdtgrp to the list of rdtgrps the parent
-	 * ctrl_mon group has to track.
-	 */
-	list_add_tail(&rdtgrp->mon.crdtgrp_list, &prgrp->mon.crdtgrp_list);
-
-out_unlock:
-	rdtgroup_kn_unlock(parent_kn);
-	return ret;
-}
-
-/*
- * These are rdtgroups created under the root directory. Can be used
- * to allocate and monitor resources.
- */
-static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn,
-				   const char *name, umode_t mode)
-{
-	struct rdtgroup *rdtgrp;
-	struct kernfs_node *kn;
-	u32 closid;
-	int ret;
-
-	ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTCTRL_GROUP, &rdtgrp);
-	if (ret)
-		return ret;
-
-	kn = rdtgrp->kn;
-	ret = closid_alloc();
-	if (ret < 0) {
-		rdt_last_cmd_puts("Out of CLOSIDs\n");
-		goto out_common_fail;
-	}
-	closid = ret;
-	ret = 0;
-
-	rdtgrp->closid = closid;
-
-	ret = mkdir_rdt_prepare_rmid_alloc(rdtgrp);
-	if (ret)
-		goto out_closid_free;
-
-	kernfs_activate(rdtgrp->kn);
-
-	ret = rdtgroup_init_alloc(rdtgrp);
-	if (ret < 0)
-		goto out_rmid_free;
-
-	list_add(&rdtgrp->rdtgroup_list, &rdt_all_groups);
-
-	if (resctrl_arch_mon_capable()) {
-		/*
-		 * Create an empty mon_groups directory to hold the subset
-		 * of tasks and cpus to monitor.
-		 */
-		ret = mongroup_create_dir(kn, rdtgrp, "mon_groups", NULL);
-		if (ret) {
-			rdt_last_cmd_puts("kernfs subdir error\n");
-			goto out_del_list;
-		}
-		if (is_mba_sc(NULL))
-			rdtgrp->mba_mbps_event = mba_mbps_default_event;
-	}
-
-	goto out_unlock;
-
-out_del_list:
-	list_del(&rdtgrp->rdtgroup_list);
-out_rmid_free:
-	mkdir_rdt_prepare_rmid_free(rdtgrp);
-out_closid_free:
-	closid_free(closid);
-out_common_fail:
-	mkdir_rdt_prepare_clean(rdtgrp);
-out_unlock:
-	rdtgroup_kn_unlock(parent_kn);
-	return ret;
-}
-
-static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
-			  umode_t mode)
-{
-	/* Do not accept '\n' to avoid unparsable situation. */
-	if (strchr(name, '\n'))
-		return -EINVAL;
-
-	/*
-	 * If the parent directory is the root directory and RDT
-	 * allocation is supported, add a control and monitoring
-	 * subdirectory
-	 */
-	if (resctrl_arch_alloc_capable() && parent_kn == rdtgroup_default.kn)
-		return rdtgroup_mkdir_ctrl_mon(parent_kn, name, mode);
-
-	/* Else, attempt to add a monitoring subdirectory. */
-	if (resctrl_arch_mon_capable())
-		return rdtgroup_mkdir_mon(parent_kn, name, mode);
-
-	return -EPERM;
-}
-
-static int rdtgroup_rmdir_mon(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
-{
-	struct rdtgroup *prdtgrp = rdtgrp->mon.parent;
-	u32 closid, rmid;
-	int cpu;
-
-	/* Give any tasks back to the parent group */
-	rdt_move_group_tasks(rdtgrp, prdtgrp, tmpmask);
-
-	/*
-	 * Update per cpu closid/rmid of the moved CPUs first.
-	 * Note: the closid will not change, but the arch code still needs it.
-	 */
-	closid = prdtgrp->closid;
-	rmid = prdtgrp->mon.rmid;
-	for_each_cpu(cpu, &rdtgrp->cpu_mask)
-		resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
-
-	/*
-	 * Update the MSR on moved CPUs and CPUs which have moved
-	 * task running on them.
-	 */
-	cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask);
-	update_closid_rmid(tmpmask, NULL);
-
-	rdtgrp->flags = RDT_DELETED;
-	free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
-
-	/*
-	 * Remove the rdtgrp from the parent ctrl_mon group's list
-	 */
-	WARN_ON(list_empty(&prdtgrp->mon.crdtgrp_list));
-	list_del(&rdtgrp->mon.crdtgrp_list);
-
-	kernfs_remove(rdtgrp->kn);
-
-	return 0;
-}
-
-static int rdtgroup_ctrl_remove(struct rdtgroup *rdtgrp)
-{
-	rdtgrp->flags = RDT_DELETED;
-	list_del(&rdtgrp->rdtgroup_list);
-
-	kernfs_remove(rdtgrp->kn);
-	return 0;
-}
-
-static int rdtgroup_rmdir_ctrl(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
-{
-	u32 closid, rmid;
-	int cpu;
-
-	/* Give any tasks back to the default group */
-	rdt_move_group_tasks(rdtgrp, &rdtgroup_default, tmpmask);
-
-	/* Give any CPUs back to the default group */
-	cpumask_or(&rdtgroup_default.cpu_mask,
-		   &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);
-
-	/* Update per cpu closid and rmid of the moved CPUs first */
-	closid = rdtgroup_default.closid;
-	rmid = rdtgroup_default.mon.rmid;
-	for_each_cpu(cpu, &rdtgrp->cpu_mask)
-		resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
-
-	/*
-	 * Update the MSR on moved CPUs and CPUs which have moved
-	 * task running on them.
-	 */
-	cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask);
-	update_closid_rmid(tmpmask, NULL);
-
-	free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
-	closid_free(rdtgrp->closid);
-
-	rdtgroup_ctrl_remove(rdtgrp);
-
-	/*
-	 * Free all the child monitor group rmids.
-	 */
-	free_all_child_rdtgrp(rdtgrp);
-
-	return 0;
-}
-
-static struct kernfs_node *rdt_kn_parent(struct kernfs_node *kn)
-{
-	/*
-	 * Valid within the RCU section it was obtained or while rdtgroup_mutex
-	 * is held.
-	 */
-	return rcu_dereference_check(kn->__parent, lockdep_is_held(&rdtgroup_mutex));
-}
-
-static int rdtgroup_rmdir(struct kernfs_node *kn)
-{
-	struct kernfs_node *parent_kn;
-	struct rdtgroup *rdtgrp;
-	cpumask_var_t tmpmask;
-	int ret = 0;
-
-	if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL))
-		return -ENOMEM;
-
-	rdtgrp = rdtgroup_kn_lock_live(kn);
-	if (!rdtgrp) {
-		ret = -EPERM;
-		goto out;
-	}
-	parent_kn = rdt_kn_parent(kn);
-
-	/*
-	 * If the rdtgroup is a ctrl_mon group and parent directory
-	 * is the root directory, remove the ctrl_mon group.
-	 *
-	 * If the rdtgroup is a mon group and parent directory
-	 * is a valid "mon_groups" directory, remove the mon group.
-	 */
-	if (rdtgrp->type == RDTCTRL_GROUP && parent_kn == rdtgroup_default.kn &&
-	    rdtgrp != &rdtgroup_default) {
-		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
-		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
-			ret = rdtgroup_ctrl_remove(rdtgrp);
-		} else {
-			ret = rdtgroup_rmdir_ctrl(rdtgrp, tmpmask);
-		}
-	} else if (rdtgrp->type == RDTMON_GROUP &&
-		 is_mon_groups(parent_kn, rdt_kn_name(kn))) {
-		ret = rdtgroup_rmdir_mon(rdtgrp, tmpmask);
-	} else {
-		ret = -EPERM;
-	}
-
-out:
-	rdtgroup_kn_unlock(kn);
-	free_cpumask_var(tmpmask);
-	return ret;
-}
-
-/**
- * mongrp_reparent() - replace parent CTRL_MON group of a MON group
- * @rdtgrp:		the MON group whose parent should be replaced
- * @new_prdtgrp:	replacement parent CTRL_MON group for @rdtgrp
- * @cpus:		cpumask provided by the caller for use during this call
- *
- * Replaces the parent CTRL_MON group for a MON group, resulting in all member
- * tasks' CLOSID immediately changing to that of the new parent group.
- * Monitoring data for the group is unaffected by this operation.
- */
-static void mongrp_reparent(struct rdtgroup *rdtgrp,
-			    struct rdtgroup *new_prdtgrp,
-			    cpumask_var_t cpus)
-{
-	struct rdtgroup *prdtgrp = rdtgrp->mon.parent;
-
-	WARN_ON(rdtgrp->type != RDTMON_GROUP);
-	WARN_ON(new_prdtgrp->type != RDTCTRL_GROUP);
-
-	/* Nothing to do when simply renaming a MON group. */
-	if (prdtgrp == new_prdtgrp)
-		return;
-
-	WARN_ON(list_empty(&prdtgrp->mon.crdtgrp_list));
-	list_move_tail(&rdtgrp->mon.crdtgrp_list,
-		       &new_prdtgrp->mon.crdtgrp_list);
-
-	rdtgrp->mon.parent = new_prdtgrp;
-	rdtgrp->closid = new_prdtgrp->closid;
-
-	/* Propagate updated closid to all tasks in this group. */
-	rdt_move_group_tasks(rdtgrp, rdtgrp, cpus);
-
-	update_closid_rmid(cpus, NULL);
-}
-
-static int rdtgroup_rename(struct kernfs_node *kn,
-			   struct kernfs_node *new_parent, const char *new_name)
-{
-	struct kernfs_node *kn_parent;
-	struct rdtgroup *new_prdtgrp;
-	struct rdtgroup *rdtgrp;
-	cpumask_var_t tmpmask;
-	int ret;
-
-	rdtgrp = kernfs_to_rdtgroup(kn);
-	new_prdtgrp = kernfs_to_rdtgroup(new_parent);
-	if (!rdtgrp || !new_prdtgrp)
-		return -ENOENT;
-
-	/* Release both kernfs active_refs before obtaining rdtgroup mutex. */
-	rdtgroup_kn_get(rdtgrp, kn);
-	rdtgroup_kn_get(new_prdtgrp, new_parent);
-
-	mutex_lock(&rdtgroup_mutex);
-
-	rdt_last_cmd_clear();
-
-	/*
-	 * Don't allow kernfs_to_rdtgroup() to return a parent rdtgroup if
-	 * either kernfs_node is a file.
-	 */
-	if (kernfs_type(kn) != KERNFS_DIR ||
-	    kernfs_type(new_parent) != KERNFS_DIR) {
-		rdt_last_cmd_puts("Source and destination must be directories");
-		ret = -EPERM;
-		goto out;
-	}
-
-	if ((rdtgrp->flags & RDT_DELETED) || (new_prdtgrp->flags & RDT_DELETED)) {
-		ret = -ENOENT;
-		goto out;
-	}
-
-	kn_parent = rdt_kn_parent(kn);
-	if (rdtgrp->type != RDTMON_GROUP || !kn_parent ||
-	    !is_mon_groups(kn_parent, rdt_kn_name(kn))) {
-		rdt_last_cmd_puts("Source must be a MON group\n");
-		ret = -EPERM;
-		goto out;
-	}
-
-	if (!is_mon_groups(new_parent, new_name)) {
-		rdt_last_cmd_puts("Destination must be a mon_groups subdirectory\n");
-		ret = -EPERM;
-		goto out;
-	}
-
-	/*
-	 * If the MON group is monitoring CPUs, the CPUs must be assigned to the
-	 * current parent CTRL_MON group and therefore cannot be assigned to
-	 * the new parent, making the move illegal.
-	 */
-	if (!cpumask_empty(&rdtgrp->cpu_mask) &&
-	    rdtgrp->mon.parent != new_prdtgrp) {
-		rdt_last_cmd_puts("Cannot move a MON group that monitors CPUs\n");
-		ret = -EPERM;
-		goto out;
-	}
-
-	/*
-	 * Allocate the cpumask for use in mongrp_reparent() to avoid the
-	 * possibility of failing to allocate it after kernfs_rename() has
-	 * succeeded.
-	 */
-	if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL)) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	/*
-	 * Perform all input validation and allocations needed to ensure
-	 * mongrp_reparent() will succeed before calling kernfs_rename(),
-	 * otherwise it would be necessary to revert this call if
-	 * mongrp_reparent() failed.
-	 */
-	ret = kernfs_rename(kn, new_parent, new_name);
-	if (!ret)
-		mongrp_reparent(rdtgrp, new_prdtgrp, tmpmask);
-
-	free_cpumask_var(tmpmask);
-
-out:
-	mutex_unlock(&rdtgroup_mutex);
-	rdtgroup_kn_put(rdtgrp, kn);
-	rdtgroup_kn_put(new_prdtgrp, new_parent);
-	return ret;
-}
-
-static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
-{
-	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3))
-		seq_puts(seq, ",cdp");
-
-	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2))
-		seq_puts(seq, ",cdpl2");
-
-	if (is_mba_sc(resctrl_arch_get_resource(RDT_RESOURCE_MBA)))
-		seq_puts(seq, ",mba_MBps");
-
-	if (resctrl_debug)
-		seq_puts(seq, ",debug");
-
-	return 0;
-}
-
-static struct kernfs_syscall_ops rdtgroup_kf_syscall_ops = {
-	.mkdir		= rdtgroup_mkdir,
-	.rmdir		= rdtgroup_rmdir,
-	.rename		= rdtgroup_rename,
-	.show_options	= rdtgroup_show_options,
-};
-
-static int rdtgroup_setup_root(struct rdt_fs_context *ctx)
-{
-	rdt_root = kernfs_create_root(&rdtgroup_kf_syscall_ops,
-				      KERNFS_ROOT_CREATE_DEACTIVATED |
-				      KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK,
-				      &rdtgroup_default);
-	if (IS_ERR(rdt_root))
-		return PTR_ERR(rdt_root);
-
-	ctx->kfc.root = rdt_root;
-	rdtgroup_default.kn = kernfs_root_to_node(rdt_root);
-
-	return 0;
-}
-
-static void rdtgroup_destroy_root(void)
-{
-	lockdep_assert_held(&rdtgroup_mutex);
-
-	kernfs_destroy_root(rdt_root);
-	rdtgroup_default.kn = NULL;
-}
-
-static void rdtgroup_setup_default(void)
-{
-	mutex_lock(&rdtgroup_mutex);
-
-	rdtgroup_default.closid = RESCTRL_RESERVED_CLOSID;
-	rdtgroup_default.mon.rmid = RESCTRL_RESERVED_RMID;
-	rdtgroup_default.type = RDTCTRL_GROUP;
-	INIT_LIST_HEAD(&rdtgroup_default.mon.crdtgrp_list);
-
-	list_add(&rdtgroup_default.rdtgroup_list, &rdt_all_groups);
-
-	mutex_unlock(&rdtgroup_mutex);
-}
-
-static void domain_destroy_mon_state(struct rdt_mon_domain *d)
-{
-	bitmap_free(d->rmid_busy_llc);
-	kfree(d->mbm_total);
-	kfree(d->mbm_local);
-}
-
-void resctrl_offline_ctrl_domain(struct rdt_resource *r, struct rdt_ctrl_domain *d)
-{
-	mutex_lock(&rdtgroup_mutex);
-
-	if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA)
-		mba_sc_domain_destroy(r, d);
-
-	mutex_unlock(&rdtgroup_mutex);
-}
-
-void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d)
-{
-	mutex_lock(&rdtgroup_mutex);
-
-	/*
-	 * If resctrl is mounted, remove all the
-	 * per domain monitor data directories.
-	 */
-	if (resctrl_mounted && resctrl_arch_mon_capable())
-		rmdir_mondata_subdir_allrdtgrp(r, d);
-
-	if (resctrl_is_mbm_enabled())
-		cancel_delayed_work(&d->mbm_over);
-	if (resctrl_arch_is_llc_occupancy_enabled() && has_busy_rmid(d)) {
-		/*
-		 * When a package is going down, forcefully
-		 * decrement rmid->ebusy. There is no way to know
-		 * that the L3 was flushed and hence may lead to
-		 * incorrect counts in rare scenarios, but leaving
-		 * the RMID as busy creates RMID leaks if the
-		 * package never comes back.
-		 */
-		__check_limbo(d, true);
-		cancel_delayed_work(&d->cqm_limbo);
-	}
-
-	domain_destroy_mon_state(d);
-
-	mutex_unlock(&rdtgroup_mutex);
-}
-
-/**
- * domain_setup_mon_state() -  Initialise domain monitoring structures.
- * @r:	The resource for the newly online domain.
- * @d:	The newly online domain.
- *
- * Allocate monitor resources that belong to this domain.
- * Called when the first CPU of a domain comes online, regardless of whether
- * the filesystem is mounted.
- * During boot this may be called before global allocations have been made by
- * resctrl_mon_resource_init().
- *
- * Returns 0 for success, or -ENOMEM.
- */
-static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_mon_domain *d)
-{
-	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
-	size_t tsize;
-
-	if (resctrl_arch_is_llc_occupancy_enabled()) {
-		d->rmid_busy_llc = bitmap_zalloc(idx_limit, GFP_KERNEL);
-		if (!d->rmid_busy_llc)
-			return -ENOMEM;
-	}
-	if (resctrl_arch_is_mbm_total_enabled()) {
-		tsize = sizeof(*d->mbm_total);
-		d->mbm_total = kcalloc(idx_limit, tsize, GFP_KERNEL);
-		if (!d->mbm_total) {
-			bitmap_free(d->rmid_busy_llc);
-			return -ENOMEM;
-		}
-	}
-	if (resctrl_arch_is_mbm_local_enabled()) {
-		tsize = sizeof(*d->mbm_local);
-		d->mbm_local = kcalloc(idx_limit, tsize, GFP_KERNEL);
-		if (!d->mbm_local) {
-			bitmap_free(d->rmid_busy_llc);
-			kfree(d->mbm_total);
-			return -ENOMEM;
-		}
-	}
-
-	return 0;
-}
-
-int resctrl_online_ctrl_domain(struct rdt_resource *r, struct rdt_ctrl_domain *d)
-{
-	int err = 0;
-
-	mutex_lock(&rdtgroup_mutex);
-
-	if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA) {
-		/* RDT_RESOURCE_MBA is never mon_capable */
-		err = mba_sc_domain_allocate(r, d);
-	}
-
-	mutex_unlock(&rdtgroup_mutex);
-
-	return err;
-}
-
-int resctrl_online_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d)
-{
-	int err;
-
-	mutex_lock(&rdtgroup_mutex);
-
-	err = domain_setup_mon_state(r, d);
-	if (err)
-		goto out_unlock;
-
-	if (resctrl_is_mbm_enabled()) {
-		INIT_DELAYED_WORK(&d->mbm_over, mbm_handle_overflow);
-		mbm_setup_overflow_handler(d, MBM_OVERFLOW_INTERVAL,
-					   RESCTRL_PICK_ANY_CPU);
-	}
-
-	if (resctrl_arch_is_llc_occupancy_enabled())
-		INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo);
-
-	/*
-	 * If the filesystem is not mounted then only the default resource group
-	 * exists. Creation of its directories is deferred until mount time
-	 * by rdt_get_tree() calling mkdir_mondata_all().
-	 * If resctrl is mounted, add per domain monitor data directories.
-	 */
-	if (resctrl_mounted && resctrl_arch_mon_capable())
-		mkdir_mondata_subdir_allrdtgrp(r, d);
-
-out_unlock:
-	mutex_unlock(&rdtgroup_mutex);
-
-	return err;
-}
-
-void resctrl_online_cpu(unsigned int cpu)
-{
-	mutex_lock(&rdtgroup_mutex);
-	/* The CPU is set in default rdtgroup after online. */
-	cpumask_set_cpu(cpu, &rdtgroup_default.cpu_mask);
-	mutex_unlock(&rdtgroup_mutex);
-}
-
-static void clear_childcpus(struct rdtgroup *r, unsigned int cpu)
-{
-	struct rdtgroup *cr;
-
-	list_for_each_entry(cr, &r->mon.crdtgrp_list, mon.crdtgrp_list) {
-		if (cpumask_test_and_clear_cpu(cpu, &cr->cpu_mask))
-			break;
-	}
-}
-
-static struct rdt_mon_domain *get_mon_domain_from_cpu(int cpu,
-						      struct rdt_resource *r)
-{
-	struct rdt_mon_domain *d;
-
-	lockdep_assert_cpus_held();
-
-	list_for_each_entry(d, &r->mon_domains, hdr.list) {
-		/* Find the domain that contains this CPU */
-		if (cpumask_test_cpu(cpu, &d->hdr.cpu_mask))
-			return d;
-	}
-
-	return NULL;
-}
-
-void resctrl_offline_cpu(unsigned int cpu)
-{
-	struct rdt_resource *l3 = resctrl_arch_get_resource(RDT_RESOURCE_L3);
-	struct rdt_mon_domain *d;
-	struct rdtgroup *rdtgrp;
-
-	mutex_lock(&rdtgroup_mutex);
-	list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
-		if (cpumask_test_and_clear_cpu(cpu, &rdtgrp->cpu_mask)) {
-			clear_childcpus(rdtgrp, cpu);
-			break;
-		}
-	}
-
-	if (!l3->mon_capable)
-		goto out_unlock;
-
-	d = get_mon_domain_from_cpu(cpu, l3);
-	if (d) {
-		if (resctrl_is_mbm_enabled() && cpu == d->mbm_work_cpu) {
-			cancel_delayed_work(&d->mbm_over);
-			mbm_setup_overflow_handler(d, 0, cpu);
-		}
-		if (resctrl_arch_is_llc_occupancy_enabled() &&
-		    cpu == d->cqm_work_cpu && has_busy_rmid(d)) {
-			cancel_delayed_work(&d->cqm_limbo);
-			cqm_setup_limbo_handler(d, 0, cpu);
-		}
-	}
-
-out_unlock:
-	mutex_unlock(&rdtgroup_mutex);
-}
-
-/*
- * resctrl_init - resctrl filesystem initialization
- *
- * Setup resctrl file system including set up root, create mount point,
- * register resctrl filesystem, and initialize files under root directory.
- *
- * Return: 0 on success or -errno
- */
-int resctrl_init(void)
-{
-	int ret = 0;
-
-	seq_buf_init(&last_cmd_status, last_cmd_status_buf,
-		     sizeof(last_cmd_status_buf));
-
-	rdtgroup_setup_default();
-
-	thread_throttle_mode_init();
-
-	ret = resctrl_mon_resource_init();
-	if (ret)
-		return ret;
-
-	ret = sysfs_create_mount_point(fs_kobj, "resctrl");
-	if (ret) {
-		resctrl_mon_resource_exit();
-		return ret;
-	}
-
-	ret = register_filesystem(&rdt_fs_type);
-	if (ret)
-		goto cleanup_mountpoint;
-
-	/*
-	 * Adding the resctrl debugfs directory here may not be ideal since
-	 * it would let the resctrl debugfs directory appear on the debugfs
-	 * filesystem before the resctrl filesystem is mounted.
-	 * It may also be ok since that would enable debugging of RDT before
-	 * resctrl is mounted.
-	 * The reason why the debugfs directory is created here and not in
-	 * rdt_get_tree() is because rdt_get_tree() takes rdtgroup_mutex and
-	 * during the debugfs directory creation also &sb->s_type->i_mutex_key
-	 * (the lockdep class of inode->i_rwsem). Other filesystem
-	 * interactions (eg. SyS_getdents) have the lock ordering:
-	 * &sb->s_type->i_mutex_key --> &mm->mmap_lock
-	 * During mmap(), called with &mm->mmap_lock, the rdtgroup_mutex
-	 * is taken, thus creating dependency:
-	 * &mm->mmap_lock --> rdtgroup_mutex for the latter that can cause
-	 * issues considering the other two lock dependencies.
-	 * By creating the debugfs directory here we avoid a dependency
-	 * that may cause deadlock (even though file operations cannot
-	 * occur until the filesystem is mounted, but I do not know how to
-	 * tell lockdep that).
-	 */
-	debugfs_resctrl = debugfs_create_dir("resctrl", NULL);
-
-	return 0;
-
-cleanup_mountpoint:
-	sysfs_remove_mount_point(fs_kobj, "resctrl");
-	resctrl_mon_resource_exit();
-
-	return ret;
-}
-
-static bool resctrl_online_domains_exist(void)
-{
-	struct rdt_resource *r;
-
-	/*
-	 * Only walk capable resources to allow resctrl_arch_get_resource()
-	 * to return dummy 'not capable' resources.
-	 */
-	for_each_alloc_capable_rdt_resource(r) {
-		if (!list_empty(&r->ctrl_domains))
-			return true;
-	}
-
-	for_each_mon_capable_rdt_resource(r) {
-		if (!list_empty(&r->mon_domains))
-			return true;
-	}
-
-	return false;
-}
-
-/**
- * resctrl_exit() - Remove the resctrl filesystem and free resources.
- *
- * Called by the architecture code in response to a fatal error.
- * Removes resctrl files and structures from kernfs to prevent further
- * configuration.
- *
- * When called by the architecture code, all CPUs and resctrl domains must be
- * offline. This ensures the limbo and overflow handlers are not scheduled to
- * run, meaning the data structures they access can be freed by
- * resctrl_mon_resource_exit().
- *
- * After resctrl_exit() returns, the architecture code should return an
- * error from all resctrl_arch_ functions that can do this.
- * resctrl_arch_get_resource() must continue to return struct rdt_resources
- * with the correct rid field to ensure the filesystem can be unmounted.
- */
-void resctrl_exit(void)
-{
-	cpus_read_lock();
-	WARN_ON_ONCE(resctrl_online_domains_exist());
-
-	mutex_lock(&rdtgroup_mutex);
-	resctrl_fs_teardown();
-	mutex_unlock(&rdtgroup_mutex);
-
-	cpus_read_unlock();
-
-	debugfs_remove_recursive(debugfs_resctrl);
-	debugfs_resctrl = NULL;
-	unregister_filesystem(&rdt_fs_type);
-
-	/*
-	 * Do not remove the sysfs mount point added by resctrl_init() so that
-	 * it can be used to umount resctrl.
-	 */
-
-	resctrl_mon_resource_exit();
+	return;
 }
diff --git a/fs/resctrl/Kconfig b/fs/resctrl/Kconfig
index 478a8e2ad99f..21671301bd8a 100644
--- a/fs/resctrl/Kconfig
+++ b/fs/resctrl/Kconfig
@@ -21,7 +21,7 @@ config RESCTRL_FS
 	  On architectures where this can be disabled independently, it is
 	  safe to say N.
 
-	  See <file:Documentation/arch/x86/resctrl.rst> for more information.
+	  See <file:Documentation/filesystems/resctrl.rst> for more information.
 
 config RESCTRL_FS_PSEUDO_LOCK
 	bool
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index e69de29bb2d1..6ed2dfd4dbbd 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -0,0 +1,661 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Resource Director Technology(RDT)
+ * - Cache Allocation code.
+ *
+ * Copyright (C) 2016 Intel Corporation
+ *
+ * Authors:
+ *    Fenghua Yu <fenghua.yu@intel.com>
+ *    Tony Luck <tony.luck@intel.com>
+ *
+ * More information about RDT be found in the Intel (R) x86 Architecture
+ * Software Developer Manual June 2016, volume 3, section 17.17.
+ */
+
+#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
+
+#include <linux/cpu.h>
+#include <linux/kernfs.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/tick.h>
+
+#include "internal.h"
+
+struct rdt_parse_data {
+	struct rdtgroup		*rdtgrp;
+	char			*buf;
+};
+
+typedef int (ctrlval_parser_t)(struct rdt_parse_data *data,
+			       struct resctrl_schema *s,
+			       struct rdt_ctrl_domain *d);
+
+/*
+ * Check whether MBA bandwidth percentage value is correct. The value is
+ * checked against the minimum and max bandwidth values specified by the
+ * hardware. The allocated bandwidth percentage is rounded to the next
+ * control step available on the hardware.
+ */
+static bool bw_validate(char *buf, u32 *data, struct rdt_resource *r)
+{
+	int ret;
+	u32 bw;
+
+	/*
+	 * Only linear delay values is supported for current Intel SKUs.
+	 */
+	if (!r->membw.delay_linear && r->membw.arch_needs_linear) {
+		rdt_last_cmd_puts("No support for non-linear MB domains\n");
+		return false;
+	}
+
+	ret = kstrtou32(buf, 10, &bw);
+	if (ret) {
+		rdt_last_cmd_printf("Invalid MB value %s\n", buf);
+		return false;
+	}
+
+	/* Nothing else to do if software controller is enabled. */
+	if (is_mba_sc(r)) {
+		*data = bw;
+		return true;
+	}
+
+	if (bw < r->membw.min_bw || bw > r->membw.max_bw) {
+		rdt_last_cmd_printf("MB value %u out of range [%d,%d]\n",
+				    bw, r->membw.min_bw, r->membw.max_bw);
+		return false;
+	}
+
+	*data = roundup(bw, (unsigned long)r->membw.bw_gran);
+	return true;
+}
+
+static int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
+		    struct rdt_ctrl_domain *d)
+{
+	struct resctrl_staged_config *cfg;
+	u32 closid = data->rdtgrp->closid;
+	struct rdt_resource *r = s->res;
+	u32 bw_val;
+
+	cfg = &d->staged_config[s->conf_type];
+	if (cfg->have_new_ctrl) {
+		rdt_last_cmd_printf("Duplicate domain %d\n", d->hdr.id);
+		return -EINVAL;
+	}
+
+	if (!bw_validate(data->buf, &bw_val, r))
+		return -EINVAL;
+
+	if (is_mba_sc(r)) {
+		d->mbps_val[closid] = bw_val;
+		return 0;
+	}
+
+	cfg->new_ctrl = bw_val;
+	cfg->have_new_ctrl = true;
+
+	return 0;
+}
+
+/*
+ * Check whether a cache bit mask is valid.
+ * On Intel CPUs, non-contiguous 1s value support is indicated by CPUID:
+ *   - CPUID.0x10.1:ECX[3]: L3 non-contiguous 1s value supported if 1
+ *   - CPUID.0x10.2:ECX[3]: L2 non-contiguous 1s value supported if 1
+ *
+ * Haswell does not support a non-contiguous 1s value and additionally
+ * requires at least two bits set.
+ * AMD allows non-contiguous bitmasks.
+ */
+static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
+{
+	u32 supported_bits = BIT_MASK(r->cache.cbm_len) - 1;
+	unsigned int cbm_len = r->cache.cbm_len;
+	unsigned long first_bit, zero_bit, val;
+	int ret;
+
+	ret = kstrtoul(buf, 16, &val);
+	if (ret) {
+		rdt_last_cmd_printf("Non-hex character in the mask %s\n", buf);
+		return false;
+	}
+
+	if ((r->cache.min_cbm_bits > 0 && val == 0) || val > supported_bits) {
+		rdt_last_cmd_puts("Mask out of range\n");
+		return false;
+	}
+
+	first_bit = find_first_bit(&val, cbm_len);
+	zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
+
+	/* Are non-contiguous bitmasks allowed? */
+	if (!r->cache.arch_has_sparse_bitmasks &&
+	    (find_next_bit(&val, cbm_len, zero_bit) < cbm_len)) {
+		rdt_last_cmd_printf("The mask %lx has non-consecutive 1-bits\n", val);
+		return false;
+	}
+
+	if ((zero_bit - first_bit) < r->cache.min_cbm_bits) {
+		rdt_last_cmd_printf("Need at least %d bits in the mask\n",
+				    r->cache.min_cbm_bits);
+		return false;
+	}
+
+	*data = val;
+	return true;
+}
+
+/*
+ * Read one cache bit mask (hex). Check that it is valid for the current
+ * resource type.
+ */
+static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
+		     struct rdt_ctrl_domain *d)
+{
+	struct rdtgroup *rdtgrp = data->rdtgrp;
+	struct resctrl_staged_config *cfg;
+	struct rdt_resource *r = s->res;
+	u32 cbm_val;
+
+	cfg = &d->staged_config[s->conf_type];
+	if (cfg->have_new_ctrl) {
+		rdt_last_cmd_printf("Duplicate domain %d\n", d->hdr.id);
+		return -EINVAL;
+	}
+
+	/*
+	 * Cannot set up more than one pseudo-locked region in a cache
+	 * hierarchy.
+	 */
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
+	    rdtgroup_pseudo_locked_in_hierarchy(d)) {
+		rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
+		return -EINVAL;
+	}
+
+	if (!cbm_validate(data->buf, &cbm_val, r))
+		return -EINVAL;
+
+	if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
+	     rdtgrp->mode == RDT_MODE_SHAREABLE) &&
+	    rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
+		rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * The CBM may not overlap with the CBM of another closid if
+	 * either is exclusive.
+	 */
+	if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, true)) {
+		rdt_last_cmd_puts("Overlaps with exclusive group\n");
+		return -EINVAL;
+	}
+
+	if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, false)) {
+		if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
+		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+			rdt_last_cmd_puts("Overlaps with other group\n");
+			return -EINVAL;
+		}
+	}
+
+	cfg->new_ctrl = cbm_val;
+	cfg->have_new_ctrl = true;
+
+	return 0;
+}
+
+/*
+ * For each domain in this resource we expect to find a series of:
+ *	id=mask
+ * separated by ";". The "id" is in decimal, and must match one of
+ * the "id"s for this resource.
+ */
+static int parse_line(char *line, struct resctrl_schema *s,
+		      struct rdtgroup *rdtgrp)
+{
+	enum resctrl_conf_type t = s->conf_type;
+	ctrlval_parser_t *parse_ctrlval = NULL;
+	struct resctrl_staged_config *cfg;
+	struct rdt_resource *r = s->res;
+	struct rdt_parse_data data;
+	struct rdt_ctrl_domain *d;
+	char *dom = NULL, *id;
+	unsigned long dom_id;
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	switch (r->schema_fmt) {
+	case RESCTRL_SCHEMA_BITMAP:
+		parse_ctrlval = &parse_cbm;
+		break;
+	case RESCTRL_SCHEMA_RANGE:
+		parse_ctrlval = &parse_bw;
+		break;
+	}
+
+	if (WARN_ON_ONCE(!parse_ctrlval))
+		return -EINVAL;
+
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
+	    (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)) {
+		rdt_last_cmd_puts("Cannot pseudo-lock MBA resource\n");
+		return -EINVAL;
+	}
+
+next:
+	if (!line || line[0] == '\0')
+		return 0;
+	dom = strsep(&line, ";");
+	id = strsep(&dom, "=");
+	if (!dom || kstrtoul(id, 10, &dom_id)) {
+		rdt_last_cmd_puts("Missing '=' or non-numeric domain\n");
+		return -EINVAL;
+	}
+	dom = strim(dom);
+	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
+		if (d->hdr.id == dom_id) {
+			data.buf = dom;
+			data.rdtgrp = rdtgrp;
+			if (parse_ctrlval(&data, s, d))
+				return -EINVAL;
+			if (rdtgrp->mode ==  RDT_MODE_PSEUDO_LOCKSETUP) {
+				cfg = &d->staged_config[t];
+				/*
+				 * In pseudo-locking setup mode and just
+				 * parsed a valid CBM that should be
+				 * pseudo-locked. Only one locked region per
+				 * resource group and domain so just do
+				 * the required initialization for single
+				 * region and return.
+				 */
+				rdtgrp->plr->s = s;
+				rdtgrp->plr->d = d;
+				rdtgrp->plr->cbm = cfg->new_ctrl;
+				d->plr = rdtgrp->plr;
+				return 0;
+			}
+			goto next;
+		}
+	}
+	return -EINVAL;
+}
+
+static int rdtgroup_parse_resource(char *resname, char *tok,
+				   struct rdtgroup *rdtgrp)
+{
+	struct resctrl_schema *s;
+
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		if (!strcmp(resname, s->name) && rdtgrp->closid < s->num_closid)
+			return parse_line(tok, s, rdtgrp);
+	}
+	rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
+	return -EINVAL;
+}
+
+ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
+				char *buf, size_t nbytes, loff_t off)
+{
+	struct resctrl_schema *s;
+	struct rdtgroup *rdtgrp;
+	struct rdt_resource *r;
+	char *tok, *resname;
+	int ret = 0;
+
+	/* Valid input requires a trailing newline */
+	if (nbytes == 0 || buf[nbytes - 1] != '\n')
+		return -EINVAL;
+	buf[nbytes - 1] = '\0';
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		rdtgroup_kn_unlock(of->kn);
+		return -ENOENT;
+	}
+	rdt_last_cmd_clear();
+
+	/*
+	 * No changes to pseudo-locked region allowed. It has to be removed
+	 * and re-created instead.
+	 */
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+		ret = -EINVAL;
+		rdt_last_cmd_puts("Resource group is pseudo-locked\n");
+		goto out;
+	}
+
+	rdt_staged_configs_clear();
+
+	while ((tok = strsep(&buf, "\n")) != NULL) {
+		resname = strim(strsep(&tok, ":"));
+		if (!tok) {
+			rdt_last_cmd_puts("Missing ':'\n");
+			ret = -EINVAL;
+			goto out;
+		}
+		if (tok[0] == '\0') {
+			rdt_last_cmd_printf("Missing '%s' value\n", resname);
+			ret = -EINVAL;
+			goto out;
+		}
+		ret = rdtgroup_parse_resource(resname, tok, rdtgrp);
+		if (ret)
+			goto out;
+	}
+
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		r = s->res;
+
+		/*
+		 * Writes to mba_sc resources update the software controller,
+		 * not the control MSR.
+		 */
+		if (is_mba_sc(r))
+			continue;
+
+		ret = resctrl_arch_update_domains(r, rdtgrp->closid);
+		if (ret)
+			goto out;
+	}
+
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+		/*
+		 * If pseudo-locking fails we keep the resource group in
+		 * mode RDT_MODE_PSEUDO_LOCKSETUP with its class of service
+		 * active and updated for just the domain the pseudo-locked
+		 * region was requested for.
+		 */
+		ret = rdtgroup_pseudo_lock_create(rdtgrp);
+	}
+
+out:
+	rdt_staged_configs_clear();
+	rdtgroup_kn_unlock(of->kn);
+	return ret ?: nbytes;
+}
+
+static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
+{
+	struct rdt_resource *r = schema->res;
+	struct rdt_ctrl_domain *dom;
+	bool sep = false;
+	u32 ctrl_val;
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	seq_printf(s, "%*s:", max_name_width, schema->name);
+	list_for_each_entry(dom, &r->ctrl_domains, hdr.list) {
+		if (sep)
+			seq_puts(s, ";");
+
+		if (is_mba_sc(r))
+			ctrl_val = dom->mbps_val[closid];
+		else
+			ctrl_val = resctrl_arch_get_config(r, dom, closid,
+							   schema->conf_type);
+
+		seq_printf(s, schema->fmt_str, dom->hdr.id, ctrl_val);
+		sep = true;
+	}
+	seq_puts(s, "\n");
+}
+
+int rdtgroup_schemata_show(struct kernfs_open_file *of,
+			   struct seq_file *s, void *v)
+{
+	struct resctrl_schema *schema;
+	struct rdtgroup *rdtgrp;
+	int ret = 0;
+	u32 closid;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (rdtgrp) {
+		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+			list_for_each_entry(schema, &resctrl_schema_all, list) {
+				seq_printf(s, "%s:uninitialized\n", schema->name);
+			}
+		} else if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+			if (!rdtgrp->plr->d) {
+				rdt_last_cmd_clear();
+				rdt_last_cmd_puts("Cache domain offline\n");
+				ret = -ENODEV;
+			} else {
+				seq_printf(s, "%s:%d=%x\n",
+					   rdtgrp->plr->s->res->name,
+					   rdtgrp->plr->d->hdr.id,
+					   rdtgrp->plr->cbm);
+			}
+		} else {
+			closid = rdtgrp->closid;
+			list_for_each_entry(schema, &resctrl_schema_all, list) {
+				if (closid < schema->num_closid)
+					show_doms(s, schema, closid);
+			}
+		}
+	} else {
+		ret = -ENOENT;
+	}
+	rdtgroup_kn_unlock(of->kn);
+	return ret;
+}
+
+static int smp_mon_event_count(void *arg)
+{
+	mon_event_count(arg);
+
+	return 0;
+}
+
+ssize_t rdtgroup_mba_mbps_event_write(struct kernfs_open_file *of,
+				      char *buf, size_t nbytes, loff_t off)
+{
+	struct rdtgroup *rdtgrp;
+	int ret = 0;
+
+	/* Valid input requires a trailing newline */
+	if (nbytes == 0 || buf[nbytes - 1] != '\n')
+		return -EINVAL;
+	buf[nbytes - 1] = '\0';
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		rdtgroup_kn_unlock(of->kn);
+		return -ENOENT;
+	}
+	rdt_last_cmd_clear();
+
+	if (!strcmp(buf, "mbm_local_bytes")) {
+		if (resctrl_arch_is_mbm_local_enabled())
+			rdtgrp->mba_mbps_event = QOS_L3_MBM_LOCAL_EVENT_ID;
+		else
+			ret = -EINVAL;
+	} else if (!strcmp(buf, "mbm_total_bytes")) {
+		if (resctrl_arch_is_mbm_total_enabled())
+			rdtgrp->mba_mbps_event = QOS_L3_MBM_TOTAL_EVENT_ID;
+		else
+			ret = -EINVAL;
+	} else {
+		ret = -EINVAL;
+	}
+
+	if (ret)
+		rdt_last_cmd_printf("Unsupported event id '%s'\n", buf);
+
+	rdtgroup_kn_unlock(of->kn);
+
+	return ret ?: nbytes;
+}
+
+int rdtgroup_mba_mbps_event_show(struct kernfs_open_file *of,
+				 struct seq_file *s, void *v)
+{
+	struct rdtgroup *rdtgrp;
+	int ret = 0;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+
+	if (rdtgrp) {
+		switch (rdtgrp->mba_mbps_event) {
+		case QOS_L3_MBM_LOCAL_EVENT_ID:
+			seq_puts(s, "mbm_local_bytes\n");
+			break;
+		case QOS_L3_MBM_TOTAL_EVENT_ID:
+			seq_puts(s, "mbm_total_bytes\n");
+			break;
+		default:
+			pr_warn_once("Bad event %d\n", rdtgrp->mba_mbps_event);
+			ret = -EINVAL;
+			break;
+		}
+	} else {
+		ret = -ENOENT;
+	}
+
+	rdtgroup_kn_unlock(of->kn);
+
+	return ret;
+}
+
+struct rdt_domain_hdr *resctrl_find_domain(struct list_head *h, int id,
+					   struct list_head **pos)
+{
+	struct rdt_domain_hdr *d;
+	struct list_head *l;
+
+	list_for_each(l, h) {
+		d = list_entry(l, struct rdt_domain_hdr, list);
+		/* When id is found, return its domain. */
+		if (id == d->id)
+			return d;
+		/* Stop searching when finding id's position in sorted list. */
+		if (id < d->id)
+			break;
+	}
+
+	if (pos)
+		*pos = l;
+
+	return NULL;
+}
+
+void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
+		    struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
+		    cpumask_t *cpumask, int evtid, int first)
+{
+	int cpu;
+
+	/* When picking a CPU from cpu_mask, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	/*
+	 * Setup the parameters to pass to mon_event_count() to read the data.
+	 */
+	rr->rgrp = rdtgrp;
+	rr->evtid = evtid;
+	rr->r = r;
+	rr->d = d;
+	rr->first = first;
+	rr->arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, evtid);
+	if (IS_ERR(rr->arch_mon_ctx)) {
+		rr->err = -EINVAL;
+		return;
+	}
+
+	cpu = cpumask_any_housekeeping(cpumask, RESCTRL_PICK_ANY_CPU);
+
+	/*
+	 * cpumask_any_housekeeping() prefers housekeeping CPUs, but
+	 * are all the CPUs nohz_full? If yes, pick a CPU to IPI.
+	 * MPAM's resctrl_arch_rmid_read() is unable to read the
+	 * counters on some platforms if its called in IRQ context.
+	 */
+	if (tick_nohz_full_cpu(cpu))
+		smp_call_function_any(cpumask, mon_event_count, rr, 1);
+	else
+		smp_call_on_cpu(cpu, smp_mon_event_count, rr, false);
+
+	resctrl_arch_mon_ctx_free(r, evtid, rr->arch_mon_ctx);
+}
+
+int rdtgroup_mondata_show(struct seq_file *m, void *arg)
+{
+	struct kernfs_open_file *of = m->private;
+	enum resctrl_res_level resid;
+	enum resctrl_event_id evtid;
+	struct rdt_domain_hdr *hdr;
+	struct rmid_read rr = {0};
+	struct rdt_mon_domain *d;
+	struct rdtgroup *rdtgrp;
+	struct rdt_resource *r;
+	struct mon_data *md;
+	int domid, ret = 0;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	md = of->kn->priv;
+	if (WARN_ON_ONCE(!md)) {
+		ret = -EIO;
+		goto out;
+	}
+
+	resid = md->rid;
+	domid = md->domid;
+	evtid = md->evtid;
+	r = resctrl_arch_get_resource(resid);
+
+	if (md->sum) {
+		/*
+		 * This file requires summing across all domains that share
+		 * the L3 cache id that was provided in the "domid" field of the
+		 * struct mon_data. Search all domains in the resource for
+		 * one that matches this cache id.
+		 */
+		list_for_each_entry(d, &r->mon_domains, hdr.list) {
+			if (d->ci->id == domid) {
+				rr.ci = d->ci;
+				mon_event_read(&rr, r, NULL, rdtgrp,
+					       &d->ci->shared_cpu_map, evtid, false);
+				goto checkresult;
+			}
+		}
+		ret = -ENOENT;
+		goto out;
+	} else {
+		/*
+		 * This file provides data from a single domain. Search
+		 * the resource to find the domain with "domid".
+		 */
+		hdr = resctrl_find_domain(&r->mon_domains, domid, NULL);
+		if (!hdr || WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN)) {
+			ret = -ENOENT;
+			goto out;
+		}
+		d = container_of(hdr, struct rdt_mon_domain, hdr);
+		mon_event_read(&rr, r, d, rdtgrp, &d->hdr.cpu_mask, evtid, false);
+	}
+
+checkresult:
+
+	if (rr.err == -EIO)
+		seq_puts(m, "Error\n");
+	else if (rr.err == -EINVAL)
+		seq_puts(m, "Unavailable\n");
+	else
+		seq_printf(m, "%llu\n", rr.val);
+
+out:
+	rdtgroup_kn_unlock(of->kn);
+	return ret;
+}
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index e69de29bb2d1..9a8cf6f11151 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -0,0 +1,426 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _FS_RESCTRL_INTERNAL_H
+#define _FS_RESCTRL_INTERNAL_H
+
+#include <linux/resctrl.h>
+#include <linux/kernfs.h>
+#include <linux/fs_context.h>
+#include <linux/tick.h>
+
+#define CQM_LIMBOCHECK_INTERVAL	1000
+
+/**
+ * cpumask_any_housekeeping() - Choose any CPU in @mask, preferring those that
+ *			        aren't marked nohz_full
+ * @mask:	The mask to pick a CPU from.
+ * @exclude_cpu:The CPU to avoid picking.
+ *
+ * Returns a CPU from @mask, but not @exclude_cpu. If there are housekeeping
+ * CPUs that don't use nohz_full, these are preferred. Pass
+ * RESCTRL_PICK_ANY_CPU to avoid excluding any CPUs.
+ *
+ * When a CPU is excluded, returns >= nr_cpu_ids if no CPUs are available.
+ */
+static inline unsigned int
+cpumask_any_housekeeping(const struct cpumask *mask, int exclude_cpu)
+{
+	unsigned int cpu;
+
+	/* Try to find a CPU that isn't nohz_full to use in preference */
+	if (tick_nohz_full_enabled()) {
+		cpu = cpumask_any_andnot_but(mask, tick_nohz_full_mask, exclude_cpu);
+		if (cpu < nr_cpu_ids)
+			return cpu;
+	}
+
+	return cpumask_any_but(mask, exclude_cpu);
+}
+
+struct rdt_fs_context {
+	struct kernfs_fs_context	kfc;
+	bool				enable_cdpl2;
+	bool				enable_cdpl3;
+	bool				enable_mba_mbps;
+	bool				enable_debug;
+};
+
+static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
+{
+	struct kernfs_fs_context *kfc = fc->fs_private;
+
+	return container_of(kfc, struct rdt_fs_context, kfc);
+}
+
+/**
+ * struct mon_evt - Entry in the event list of a resource
+ * @evtid:		event id
+ * @name:		name of the event
+ * @configurable:	true if the event is configurable
+ * @list:		entry in &rdt_resource->evt_list
+ */
+struct mon_evt {
+	enum resctrl_event_id	evtid;
+	char			*name;
+	bool			configurable;
+	struct list_head	list;
+};
+
+/**
+ * struct mon_data - Monitoring details for each event file.
+ * @list:            Member of the global @mon_data_kn_priv_list list.
+ * @rid:             Resource id associated with the event file.
+ * @evtid:           Event id associated with the event file.
+ * @sum:             Set when event must be summed across multiple
+ *                   domains.
+ * @domid:           When @sum is zero this is the domain to which
+ *                   the event file belongs. When @sum is one this
+ *                   is the id of the L3 cache that all domains to be
+ *                   summed share.
+ *
+ * Pointed to by the kernfs kn->priv field of monitoring event files.
+ * Readers and writers must hold rdtgroup_mutex.
+ */
+struct mon_data {
+	struct list_head	list;
+	enum resctrl_res_level	rid;
+	enum resctrl_event_id	evtid;
+	int			domid;
+	bool			sum;
+};
+
+/**
+ * struct rmid_read - Data passed across smp_call*() to read event count.
+ * @rgrp:  Resource group for which the counter is being read. If it is a parent
+ *	   resource group then its event count is summed with the count from all
+ *	   its child resource groups.
+ * @r:	   Resource describing the properties of the event being read.
+ * @d:	   Domain that the counter should be read from. If NULL then sum all
+ *	   domains in @r sharing L3 @ci.id
+ * @evtid: Which monitor event to read.
+ * @first: Initialize MBM counter when true.
+ * @ci:    Cacheinfo for L3. Only set when @d is NULL. Used when summing domains.
+ * @err:   Error encountered when reading counter.
+ * @val:   Returned value of event counter. If @rgrp is a parent resource group,
+ *	   @val includes the sum of event counts from its child resource groups.
+ *	   If @d is NULL, @val includes the sum of all domains in @r sharing @ci.id,
+ *	   (summed across child resource groups if @rgrp is a parent resource group).
+ * @arch_mon_ctx: Hardware monitor allocated for this read request (MPAM only).
+ */
+struct rmid_read {
+	struct rdtgroup		*rgrp;
+	struct rdt_resource	*r;
+	struct rdt_mon_domain	*d;
+	enum resctrl_event_id	evtid;
+	bool			first;
+	struct cacheinfo	*ci;
+	int			err;
+	u64			val;
+	void			*arch_mon_ctx;
+};
+
+extern struct list_head resctrl_schema_all;
+
+extern bool resctrl_mounted;
+
+enum rdt_group_type {
+	RDTCTRL_GROUP = 0,
+	RDTMON_GROUP,
+	RDT_NUM_GROUP,
+};
+
+/**
+ * enum rdtgrp_mode - Mode of a RDT resource group
+ * @RDT_MODE_SHAREABLE: This resource group allows sharing of its allocations
+ * @RDT_MODE_EXCLUSIVE: No sharing of this resource group's allocations allowed
+ * @RDT_MODE_PSEUDO_LOCKSETUP: Resource group will be used for Pseudo-Locking
+ * @RDT_MODE_PSEUDO_LOCKED: No sharing of this resource group's allocations
+ *                          allowed AND the allocations are Cache Pseudo-Locked
+ * @RDT_NUM_MODES: Total number of modes
+ *
+ * The mode of a resource group enables control over the allowed overlap
+ * between allocations associated with different resource groups (classes
+ * of service). User is able to modify the mode of a resource group by
+ * writing to the "mode" resctrl file associated with the resource group.
+ *
+ * The "shareable", "exclusive", and "pseudo-locksetup" modes are set by
+ * writing the appropriate text to the "mode" file. A resource group enters
+ * "pseudo-locked" mode after the schemata is written while the resource
+ * group is in "pseudo-locksetup" mode.
+ */
+enum rdtgrp_mode {
+	RDT_MODE_SHAREABLE = 0,
+	RDT_MODE_EXCLUSIVE,
+	RDT_MODE_PSEUDO_LOCKSETUP,
+	RDT_MODE_PSEUDO_LOCKED,
+
+	/* Must be last */
+	RDT_NUM_MODES,
+};
+
+/**
+ * struct mongroup - store mon group's data in resctrl fs.
+ * @mon_data_kn:		kernfs node for the mon_data directory
+ * @parent:			parent rdtgrp
+ * @crdtgrp_list:		child rdtgroup node list
+ * @rmid:			rmid for this rdtgroup
+ */
+struct mongroup {
+	struct kernfs_node	*mon_data_kn;
+	struct rdtgroup		*parent;
+	struct list_head	crdtgrp_list;
+	u32			rmid;
+};
+
+/**
+ * struct rdtgroup - store rdtgroup's data in resctrl file system.
+ * @kn:				kernfs node
+ * @rdtgroup_list:		linked list for all rdtgroups
+ * @closid:			closid for this rdtgroup
+ * @cpu_mask:			CPUs assigned to this rdtgroup
+ * @flags:			status bits
+ * @waitcount:			how many cpus expect to find this
+ *				group when they acquire rdtgroup_mutex
+ * @type:			indicates type of this rdtgroup - either
+ *				monitor only or ctrl_mon group
+ * @mon:			mongroup related data
+ * @mode:			mode of resource group
+ * @mba_mbps_event:		input monitoring event id when mba_sc is enabled
+ * @plr:			pseudo-locked region
+ */
+struct rdtgroup {
+	struct kernfs_node		*kn;
+	struct list_head		rdtgroup_list;
+	u32				closid;
+	struct cpumask			cpu_mask;
+	int				flags;
+	atomic_t			waitcount;
+	enum rdt_group_type		type;
+	struct mongroup			mon;
+	enum rdtgrp_mode		mode;
+	enum resctrl_event_id		mba_mbps_event;
+	struct pseudo_lock_region	*plr;
+};
+
+/* rdtgroup.flags */
+#define	RDT_DELETED		1
+
+/* rftype.flags */
+#define RFTYPE_FLAGS_CPUS_LIST	1
+
+/*
+ * Define the file type flags for base and info directories.
+ */
+#define RFTYPE_INFO			BIT(0)
+
+#define RFTYPE_BASE			BIT(1)
+
+#define RFTYPE_CTRL			BIT(4)
+
+#define RFTYPE_MON			BIT(5)
+
+#define RFTYPE_TOP			BIT(6)
+
+#define RFTYPE_RES_CACHE		BIT(8)
+
+#define RFTYPE_RES_MB			BIT(9)
+
+#define RFTYPE_DEBUG			BIT(10)
+
+#define RFTYPE_CTRL_INFO		(RFTYPE_INFO | RFTYPE_CTRL)
+
+#define RFTYPE_MON_INFO			(RFTYPE_INFO | RFTYPE_MON)
+
+#define RFTYPE_TOP_INFO			(RFTYPE_INFO | RFTYPE_TOP)
+
+#define RFTYPE_CTRL_BASE		(RFTYPE_BASE | RFTYPE_CTRL)
+
+#define RFTYPE_MON_BASE			(RFTYPE_BASE | RFTYPE_MON)
+
+/* List of all resource groups */
+extern struct list_head rdt_all_groups;
+
+extern int max_name_width;
+
+/**
+ * struct rftype - describe each file in the resctrl file system
+ * @name:	File name
+ * @mode:	Access mode
+ * @kf_ops:	File operations
+ * @flags:	File specific RFTYPE_FLAGS_* flags
+ * @fflags:	File specific RFTYPE_* flags
+ * @seq_show:	Show content of the file
+ * @write:	Write to the file
+ */
+struct rftype {
+	char			*name;
+	umode_t			mode;
+	const struct kernfs_ops	*kf_ops;
+	unsigned long		flags;
+	unsigned long		fflags;
+
+	int (*seq_show)(struct kernfs_open_file *of,
+			struct seq_file *sf, void *v);
+	/*
+	 * write() is the generic write callback which maps directly to
+	 * kernfs write operation and overrides all other operations.
+	 * Maximum write size is determined by ->max_write_len.
+	 */
+	ssize_t (*write)(struct kernfs_open_file *of,
+			 char *buf, size_t nbytes, loff_t off);
+};
+
+/**
+ * struct mbm_state - status for each MBM counter in each domain
+ * @prev_bw_bytes: Previous bytes value read for bandwidth calculation
+ * @prev_bw:	The most recent bandwidth in MBps
+ */
+struct mbm_state {
+	u64	prev_bw_bytes;
+	u32	prev_bw;
+};
+
+extern struct mutex rdtgroup_mutex;
+
+static inline const char *rdt_kn_name(const struct kernfs_node *kn)
+{
+	return rcu_dereference_check(kn->name, lockdep_is_held(&rdtgroup_mutex));
+}
+
+extern struct rdtgroup rdtgroup_default;
+
+extern struct dentry *debugfs_resctrl;
+
+extern enum resctrl_event_id mba_mbps_default_event;
+
+void rdt_last_cmd_clear(void);
+
+void rdt_last_cmd_puts(const char *s);
+
+__printf(1, 2)
+void rdt_last_cmd_printf(const char *fmt, ...);
+
+struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn);
+
+void rdtgroup_kn_unlock(struct kernfs_node *kn);
+
+int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name);
+
+int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
+			     umode_t mask);
+
+ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
+				char *buf, size_t nbytes, loff_t off);
+
+int rdtgroup_schemata_show(struct kernfs_open_file *of,
+			   struct seq_file *s, void *v);
+
+ssize_t rdtgroup_mba_mbps_event_write(struct kernfs_open_file *of,
+				      char *buf, size_t nbytes, loff_t off);
+
+int rdtgroup_mba_mbps_event_show(struct kernfs_open_file *of,
+				 struct seq_file *s, void *v);
+
+bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_ctrl_domain *d,
+			   unsigned long cbm, int closid, bool exclusive);
+
+unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, struct rdt_ctrl_domain *d,
+				  unsigned long cbm);
+
+enum rdtgrp_mode rdtgroup_mode_by_closid(int closid);
+
+int rdtgroup_tasks_assigned(struct rdtgroup *r);
+
+int closids_supported(void);
+
+void closid_free(int closid);
+
+int alloc_rmid(u32 closid);
+
+void free_rmid(u32 closid, u32 rmid);
+
+void resctrl_mon_resource_exit(void);
+
+void mon_event_count(void *info);
+
+int rdtgroup_mondata_show(struct seq_file *m, void *arg);
+
+void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
+		    struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
+		    cpumask_t *cpumask, int evtid, int first);
+
+int resctrl_mon_resource_init(void);
+
+void mbm_setup_overflow_handler(struct rdt_mon_domain *dom,
+				unsigned long delay_ms,
+				int exclude_cpu);
+
+void mbm_handle_overflow(struct work_struct *work);
+
+bool is_mba_sc(struct rdt_resource *r);
+
+void cqm_setup_limbo_handler(struct rdt_mon_domain *dom, unsigned long delay_ms,
+			     int exclude_cpu);
+
+void cqm_handle_limbo(struct work_struct *work);
+
+bool has_busy_rmid(struct rdt_mon_domain *d);
+
+void __check_limbo(struct rdt_mon_domain *d, bool force_free);
+
+void resctrl_file_fflags_init(const char *config, unsigned long fflags);
+
+void rdt_staged_configs_clear(void);
+
+bool closid_allocated(unsigned int closid);
+
+int resctrl_find_cleanest_closid(void);
+
+#ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
+int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);
+
+int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp);
+
+bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_ctrl_domain *d, unsigned long cbm);
+
+bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_ctrl_domain *d);
+
+int rdt_pseudo_lock_init(void);
+
+void rdt_pseudo_lock_release(void);
+
+int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp);
+
+void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp);
+
+#else
+static inline int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_ctrl_domain *d, unsigned long cbm)
+{
+	return false;
+}
+
+static inline bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_ctrl_domain *d)
+{
+	return false;
+}
+
+static inline int rdt_pseudo_lock_init(void) { return 0; }
+static inline void rdt_pseudo_lock_release(void) { }
+static inline int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp) { }
+#endif /* CONFIG_RESCTRL_FS_PSEUDO_LOCK */
+
+#endif /* _FS_RESCTRL_INTERNAL_H */
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index e69de29bb2d1..bde2801289d3 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -0,0 +1,929 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Resource Director Technology(RDT)
+ * - Monitoring code
+ *
+ * Copyright (C) 2017 Intel Corporation
+ *
+ * Author:
+ *    Vikas Shivappa <vikas.shivappa@intel.com>
+ *
+ * This replaces the cqm.c based on perf but we reuse a lot of
+ * code and datastructures originally from Peter Zijlstra and Matt Fleming.
+ *
+ * More information about RDT be found in the Intel (R) x86 Architecture
+ * Software Developer Manual June 2016, volume 3, section 17.17.
+ */
+
+#define pr_fmt(fmt)	"resctrl: " fmt
+
+#include <linux/cpu.h>
+#include <linux/resctrl.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+
+#include "internal.h"
+
+#define CREATE_TRACE_POINTS
+
+#include "monitor_trace.h"
+
+/**
+ * struct rmid_entry - dirty tracking for all RMID.
+ * @closid:	The CLOSID for this entry.
+ * @rmid:	The RMID for this entry.
+ * @busy:	The number of domains with cached data using this RMID.
+ * @list:	Member of the rmid_free_lru list when busy == 0.
+ *
+ * Depending on the architecture the correct monitor is accessed using
+ * both @closid and @rmid, or @rmid only.
+ *
+ * Take the rdtgroup_mutex when accessing.
+ */
+struct rmid_entry {
+	u32				closid;
+	u32				rmid;
+	int				busy;
+	struct list_head		list;
+};
+
+/*
+ * @rmid_free_lru - A least recently used list of free RMIDs
+ *     These RMIDs are guaranteed to have an occupancy less than the
+ *     threshold occupancy
+ */
+static LIST_HEAD(rmid_free_lru);
+
+/*
+ * @closid_num_dirty_rmid    The number of dirty RMID each CLOSID has.
+ *     Only allocated when CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID is defined.
+ *     Indexed by CLOSID. Protected by rdtgroup_mutex.
+ */
+static u32 *closid_num_dirty_rmid;
+
+/*
+ * @rmid_limbo_count - count of currently unused but (potentially)
+ *     dirty RMIDs.
+ *     This counts RMIDs that no one is currently using but that
+ *     may have a occupancy value > resctrl_rmid_realloc_threshold. User can
+ *     change the threshold occupancy value.
+ */
+static unsigned int rmid_limbo_count;
+
+/*
+ * @rmid_entry - The entry in the limbo and free lists.
+ */
+static struct rmid_entry	*rmid_ptrs;
+
+/*
+ * This is the threshold cache occupancy in bytes at which we will consider an
+ * RMID available for re-allocation.
+ */
+unsigned int resctrl_rmid_realloc_threshold;
+
+/*
+ * This is the maximum value for the reallocation threshold, in bytes.
+ */
+unsigned int resctrl_rmid_realloc_limit;
+
+/*
+ * x86 and arm64 differ in their handling of monitoring.
+ * x86's RMID are independent numbers, there is only one source of traffic
+ * with an RMID value of '1'.
+ * arm64's PMG extends the PARTID/CLOSID space, there are multiple sources of
+ * traffic with a PMG value of '1', one for each CLOSID, meaning the RMID
+ * value is no longer unique.
+ * To account for this, resctrl uses an index. On x86 this is just the RMID,
+ * on arm64 it encodes the CLOSID and RMID. This gives a unique number.
+ *
+ * The domain's rmid_busy_llc and rmid_ptrs[] are sized by index. The arch code
+ * must accept an attempt to read every index.
+ */
+static inline struct rmid_entry *__rmid_entry(u32 idx)
+{
+	struct rmid_entry *entry;
+	u32 closid, rmid;
+
+	entry = &rmid_ptrs[idx];
+	resctrl_arch_rmid_idx_decode(idx, &closid, &rmid);
+
+	WARN_ON_ONCE(entry->closid != closid);
+	WARN_ON_ONCE(entry->rmid != rmid);
+
+	return entry;
+}
+
+static void limbo_release_entry(struct rmid_entry *entry)
+{
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	rmid_limbo_count--;
+	list_add_tail(&entry->list, &rmid_free_lru);
+
+	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
+		closid_num_dirty_rmid[entry->closid]--;
+}
+
+/*
+ * Check the RMIDs that are marked as busy for this domain. If the
+ * reported LLC occupancy is below the threshold clear the busy bit and
+ * decrement the count. If the busy count gets to zero on an RMID, we
+ * free the RMID
+ */
+void __check_limbo(struct rdt_mon_domain *d, bool force_free)
+{
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
+	struct rmid_entry *entry;
+	u32 idx, cur_idx = 1;
+	void *arch_mon_ctx;
+	bool rmid_dirty;
+	u64 val = 0;
+
+	arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, QOS_L3_OCCUP_EVENT_ID);
+	if (IS_ERR(arch_mon_ctx)) {
+		pr_warn_ratelimited("Failed to allocate monitor context: %ld",
+				    PTR_ERR(arch_mon_ctx));
+		return;
+	}
+
+	/*
+	 * Skip RMID 0 and start from RMID 1 and check all the RMIDs that
+	 * are marked as busy for occupancy < threshold. If the occupancy
+	 * is less than the threshold decrement the busy counter of the
+	 * RMID and move it to the free list when the counter reaches 0.
+	 */
+	for (;;) {
+		idx = find_next_bit(d->rmid_busy_llc, idx_limit, cur_idx);
+		if (idx >= idx_limit)
+			break;
+
+		entry = __rmid_entry(idx);
+		if (resctrl_arch_rmid_read(r, d, entry->closid, entry->rmid,
+					   QOS_L3_OCCUP_EVENT_ID, &val,
+					   arch_mon_ctx)) {
+			rmid_dirty = true;
+		} else {
+			rmid_dirty = (val >= resctrl_rmid_realloc_threshold);
+
+			/*
+			 * x86's CLOSID and RMID are independent numbers, so the entry's
+			 * CLOSID is an empty CLOSID (X86_RESCTRL_EMPTY_CLOSID). On Arm the
+			 * RMID (PMG) extends the CLOSID (PARTID) space with bits that aren't
+			 * used to select the configuration. It is thus necessary to track both
+			 * CLOSID and RMID because there may be dependencies between them
+			 * on some architectures.
+			 */
+			trace_mon_llc_occupancy_limbo(entry->closid, entry->rmid, d->hdr.id, val);
+		}
+
+		if (force_free || !rmid_dirty) {
+			clear_bit(idx, d->rmid_busy_llc);
+			if (!--entry->busy)
+				limbo_release_entry(entry);
+		}
+		cur_idx = idx + 1;
+	}
+
+	resctrl_arch_mon_ctx_free(r, QOS_L3_OCCUP_EVENT_ID, arch_mon_ctx);
+}
+
+bool has_busy_rmid(struct rdt_mon_domain *d)
+{
+	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
+
+	return find_first_bit(d->rmid_busy_llc, idx_limit) != idx_limit;
+}
+
+static struct rmid_entry *resctrl_find_free_rmid(u32 closid)
+{
+	struct rmid_entry *itr;
+	u32 itr_idx, cmp_idx;
+
+	if (list_empty(&rmid_free_lru))
+		return rmid_limbo_count ? ERR_PTR(-EBUSY) : ERR_PTR(-ENOSPC);
+
+	list_for_each_entry(itr, &rmid_free_lru, list) {
+		/*
+		 * Get the index of this free RMID, and the index it would need
+		 * to be if it were used with this CLOSID.
+		 * If the CLOSID is irrelevant on this architecture, the two
+		 * index values are always the same on every entry and thus the
+		 * very first entry will be returned.
+		 */
+		itr_idx = resctrl_arch_rmid_idx_encode(itr->closid, itr->rmid);
+		cmp_idx = resctrl_arch_rmid_idx_encode(closid, itr->rmid);
+
+		if (itr_idx == cmp_idx)
+			return itr;
+	}
+
+	return ERR_PTR(-ENOSPC);
+}
+
+/**
+ * resctrl_find_cleanest_closid() - Find a CLOSID where all the associated
+ *                                  RMID are clean, or the CLOSID that has
+ *                                  the most clean RMID.
+ *
+ * MPAM's equivalent of RMID are per-CLOSID, meaning a freshly allocated CLOSID
+ * may not be able to allocate clean RMID. To avoid this the allocator will
+ * choose the CLOSID with the most clean RMID.
+ *
+ * When the CLOSID and RMID are independent numbers, the first free CLOSID will
+ * be returned.
+ */
+int resctrl_find_cleanest_closid(void)
+{
+	u32 cleanest_closid = ~0;
+	int i = 0;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	if (!IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
+		return -EIO;
+
+	for (i = 0; i < closids_supported(); i++) {
+		int num_dirty;
+
+		if (closid_allocated(i))
+			continue;
+
+		num_dirty = closid_num_dirty_rmid[i];
+		if (num_dirty == 0)
+			return i;
+
+		if (cleanest_closid == ~0)
+			cleanest_closid = i;
+
+		if (num_dirty < closid_num_dirty_rmid[cleanest_closid])
+			cleanest_closid = i;
+	}
+
+	if (cleanest_closid == ~0)
+		return -ENOSPC;
+
+	return cleanest_closid;
+}
+
+/*
+ * For MPAM the RMID value is not unique, and has to be considered with
+ * the CLOSID. The (CLOSID, RMID) pair is allocated on all domains, which
+ * allows all domains to be managed by a single free list.
+ * Each domain also has a rmid_busy_llc to reduce the work of the limbo handler.
+ */
+int alloc_rmid(u32 closid)
+{
+	struct rmid_entry *entry;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	entry = resctrl_find_free_rmid(closid);
+	if (IS_ERR(entry))
+		return PTR_ERR(entry);
+
+	list_del(&entry->list);
+	return entry->rmid;
+}
+
+static void add_rmid_to_limbo(struct rmid_entry *entry)
+{
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	struct rdt_mon_domain *d;
+	u32 idx;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	idx = resctrl_arch_rmid_idx_encode(entry->closid, entry->rmid);
+
+	entry->busy = 0;
+	list_for_each_entry(d, &r->mon_domains, hdr.list) {
+		/*
+		 * For the first limbo RMID in the domain,
+		 * setup up the limbo worker.
+		 */
+		if (!has_busy_rmid(d))
+			cqm_setup_limbo_handler(d, CQM_LIMBOCHECK_INTERVAL,
+						RESCTRL_PICK_ANY_CPU);
+		set_bit(idx, d->rmid_busy_llc);
+		entry->busy++;
+	}
+
+	rmid_limbo_count++;
+	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID))
+		closid_num_dirty_rmid[entry->closid]++;
+}
+
+void free_rmid(u32 closid, u32 rmid)
+{
+	u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
+	struct rmid_entry *entry;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	/*
+	 * Do not allow the default rmid to be free'd. Comparing by index
+	 * allows architectures that ignore the closid parameter to avoid an
+	 * unnecessary check.
+	 */
+	if (!resctrl_arch_mon_capable() ||
+	    idx == resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
+						RESCTRL_RESERVED_RMID))
+		return;
+
+	entry = __rmid_entry(idx);
+
+	if (resctrl_arch_is_llc_occupancy_enabled())
+		add_rmid_to_limbo(entry);
+	else
+		list_add_tail(&entry->list, &rmid_free_lru);
+}
+
+static struct mbm_state *get_mbm_state(struct rdt_mon_domain *d, u32 closid,
+				       u32 rmid, enum resctrl_event_id evtid)
+{
+	u32 idx = resctrl_arch_rmid_idx_encode(closid, rmid);
+
+	switch (evtid) {
+	case QOS_L3_MBM_TOTAL_EVENT_ID:
+		return &d->mbm_total[idx];
+	case QOS_L3_MBM_LOCAL_EVENT_ID:
+		return &d->mbm_local[idx];
+	default:
+		return NULL;
+	}
+}
+
+static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
+{
+	int cpu = smp_processor_id();
+	struct rdt_mon_domain *d;
+	struct mbm_state *m;
+	int err, ret;
+	u64 tval = 0;
+
+	if (rr->first) {
+		resctrl_arch_reset_rmid(rr->r, rr->d, closid, rmid, rr->evtid);
+		m = get_mbm_state(rr->d, closid, rmid, rr->evtid);
+		if (m)
+			memset(m, 0, sizeof(struct mbm_state));
+		return 0;
+	}
+
+	if (rr->d) {
+		/* Reading a single domain, must be on a CPU in that domain. */
+		if (!cpumask_test_cpu(cpu, &rr->d->hdr.cpu_mask))
+			return -EINVAL;
+		rr->err = resctrl_arch_rmid_read(rr->r, rr->d, closid, rmid,
+						 rr->evtid, &tval, rr->arch_mon_ctx);
+		if (rr->err)
+			return rr->err;
+
+		rr->val += tval;
+
+		return 0;
+	}
+
+	/* Summing domains that share a cache, must be on a CPU for that cache. */
+	if (!cpumask_test_cpu(cpu, &rr->ci->shared_cpu_map))
+		return -EINVAL;
+
+	/*
+	 * Legacy files must report the sum of an event across all
+	 * domains that share the same L3 cache instance.
+	 * Report success if a read from any domain succeeds, -EINVAL
+	 * (translated to "Unavailable" for user space) if reading from
+	 * all domains fail for any reason.
+	 */
+	ret = -EINVAL;
+	list_for_each_entry(d, &rr->r->mon_domains, hdr.list) {
+		if (d->ci->id != rr->ci->id)
+			continue;
+		err = resctrl_arch_rmid_read(rr->r, d, closid, rmid,
+					     rr->evtid, &tval, rr->arch_mon_ctx);
+		if (!err) {
+			rr->val += tval;
+			ret = 0;
+		}
+	}
+
+	if (ret)
+		rr->err = ret;
+
+	return ret;
+}
+
+/*
+ * mbm_bw_count() - Update bw count from values previously read by
+ *		    __mon_event_count().
+ * @closid:	The closid used to identify the cached mbm_state.
+ * @rmid:	The rmid used to identify the cached mbm_state.
+ * @rr:		The struct rmid_read populated by __mon_event_count().
+ *
+ * Supporting function to calculate the memory bandwidth
+ * and delta bandwidth in MBps. The chunks value previously read by
+ * __mon_event_count() is compared with the chunks value from the previous
+ * invocation. This must be called once per second to maintain values in MBps.
+ */
+static void mbm_bw_count(u32 closid, u32 rmid, struct rmid_read *rr)
+{
+	u64 cur_bw, bytes, cur_bytes;
+	struct mbm_state *m;
+
+	m = get_mbm_state(rr->d, closid, rmid, rr->evtid);
+	if (WARN_ON_ONCE(!m))
+		return;
+
+	cur_bytes = rr->val;
+	bytes = cur_bytes - m->prev_bw_bytes;
+	m->prev_bw_bytes = cur_bytes;
+
+	cur_bw = bytes / SZ_1M;
+
+	m->prev_bw = cur_bw;
+}
+
+/*
+ * This is scheduled by mon_event_read() to read the CQM/MBM counters
+ * on a domain.
+ */
+void mon_event_count(void *info)
+{
+	struct rdtgroup *rdtgrp, *entry;
+	struct rmid_read *rr = info;
+	struct list_head *head;
+	int ret;
+
+	rdtgrp = rr->rgrp;
+
+	ret = __mon_event_count(rdtgrp->closid, rdtgrp->mon.rmid, rr);
+
+	/*
+	 * For Ctrl groups read data from child monitor groups and
+	 * add them together. Count events which are read successfully.
+	 * Discard the rmid_read's reporting errors.
+	 */
+	head = &rdtgrp->mon.crdtgrp_list;
+
+	if (rdtgrp->type == RDTCTRL_GROUP) {
+		list_for_each_entry(entry, head, mon.crdtgrp_list) {
+			if (__mon_event_count(entry->closid, entry->mon.rmid,
+					      rr) == 0)
+				ret = 0;
+		}
+	}
+
+	/*
+	 * __mon_event_count() calls for newly created monitor groups may
+	 * report -EINVAL/Unavailable if the monitor hasn't seen any traffic.
+	 * Discard error if any of the monitor event reads succeeded.
+	 */
+	if (ret == 0)
+		rr->err = 0;
+}
+
+static struct rdt_ctrl_domain *get_ctrl_domain_from_cpu(int cpu,
+							struct rdt_resource *r)
+{
+	struct rdt_ctrl_domain *d;
+
+	lockdep_assert_cpus_held();
+
+	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
+		/* Find the domain that contains this CPU */
+		if (cpumask_test_cpu(cpu, &d->hdr.cpu_mask))
+			return d;
+	}
+
+	return NULL;
+}
+
+/*
+ * Feedback loop for MBA software controller (mba_sc)
+ *
+ * mba_sc is a feedback loop where we periodically read MBM counters and
+ * adjust the bandwidth percentage values via the IA32_MBA_THRTL_MSRs so
+ * that:
+ *
+ *   current bandwidth(cur_bw) < user specified bandwidth(user_bw)
+ *
+ * This uses the MBM counters to measure the bandwidth and MBA throttle
+ * MSRs to control the bandwidth for a particular rdtgrp. It builds on the
+ * fact that resctrl rdtgroups have both monitoring and control.
+ *
+ * The frequency of the checks is 1s and we just tag along the MBM overflow
+ * timer. Having 1s interval makes the calculation of bandwidth simpler.
+ *
+ * Although MBA's goal is to restrict the bandwidth to a maximum, there may
+ * be a need to increase the bandwidth to avoid unnecessarily restricting
+ * the L2 <-> L3 traffic.
+ *
+ * Since MBA controls the L2 external bandwidth where as MBM measures the
+ * L3 external bandwidth the following sequence could lead to such a
+ * situation.
+ *
+ * Consider an rdtgroup which had high L3 <-> memory traffic in initial
+ * phases -> mba_sc kicks in and reduced bandwidth percentage values -> but
+ * after some time rdtgroup has mostly L2 <-> L3 traffic.
+ *
+ * In this case we may restrict the rdtgroup's L2 <-> L3 traffic as its
+ * throttle MSRs already have low percentage values.  To avoid
+ * unnecessarily restricting such rdtgroups, we also increase the bandwidth.
+ */
+static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_mon_domain *dom_mbm)
+{
+	u32 closid, rmid, cur_msr_val, new_msr_val;
+	struct mbm_state *pmbm_data, *cmbm_data;
+	struct rdt_ctrl_domain *dom_mba;
+	enum resctrl_event_id evt_id;
+	struct rdt_resource *r_mba;
+	struct list_head *head;
+	struct rdtgroup *entry;
+	u32 cur_bw, user_bw;
+
+	r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+	evt_id = rgrp->mba_mbps_event;
+
+	closid = rgrp->closid;
+	rmid = rgrp->mon.rmid;
+	pmbm_data = get_mbm_state(dom_mbm, closid, rmid, evt_id);
+	if (WARN_ON_ONCE(!pmbm_data))
+		return;
+
+	dom_mba = get_ctrl_domain_from_cpu(smp_processor_id(), r_mba);
+	if (!dom_mba) {
+		pr_warn_once("Failure to get domain for MBA update\n");
+		return;
+	}
+
+	cur_bw = pmbm_data->prev_bw;
+	user_bw = dom_mba->mbps_val[closid];
+
+	/* MBA resource doesn't support CDP */
+	cur_msr_val = resctrl_arch_get_config(r_mba, dom_mba, closid, CDP_NONE);
+
+	/*
+	 * For Ctrl groups read data from child monitor groups.
+	 */
+	head = &rgrp->mon.crdtgrp_list;
+	list_for_each_entry(entry, head, mon.crdtgrp_list) {
+		cmbm_data = get_mbm_state(dom_mbm, entry->closid, entry->mon.rmid, evt_id);
+		if (WARN_ON_ONCE(!cmbm_data))
+			return;
+		cur_bw += cmbm_data->prev_bw;
+	}
+
+	/*
+	 * Scale up/down the bandwidth linearly for the ctrl group.  The
+	 * bandwidth step is the bandwidth granularity specified by the
+	 * hardware.
+	 * Always increase throttling if current bandwidth is above the
+	 * target set by user.
+	 * But avoid thrashing up and down on every poll by checking
+	 * whether a decrease in throttling is likely to push the group
+	 * back over target. E.g. if currently throttling to 30% of bandwidth
+	 * on a system with 10% granularity steps, check whether moving to
+	 * 40% would go past the limit by multiplying current bandwidth by
+	 * "(30 + 10) / 30".
+	 */
+	if (cur_msr_val > r_mba->membw.min_bw && user_bw < cur_bw) {
+		new_msr_val = cur_msr_val - r_mba->membw.bw_gran;
+	} else if (cur_msr_val < MAX_MBA_BW &&
+		   (user_bw > (cur_bw * (cur_msr_val + r_mba->membw.min_bw) / cur_msr_val))) {
+		new_msr_val = cur_msr_val + r_mba->membw.bw_gran;
+	} else {
+		return;
+	}
+
+	resctrl_arch_update_one(r_mba, dom_mba, closid, CDP_NONE, new_msr_val);
+}
+
+static void mbm_update_one_event(struct rdt_resource *r, struct rdt_mon_domain *d,
+				 u32 closid, u32 rmid, enum resctrl_event_id evtid)
+{
+	struct rmid_read rr = {0};
+
+	rr.r = r;
+	rr.d = d;
+	rr.evtid = evtid;
+	rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
+	if (IS_ERR(rr.arch_mon_ctx)) {
+		pr_warn_ratelimited("Failed to allocate monitor context: %ld",
+				    PTR_ERR(rr.arch_mon_ctx));
+		return;
+	}
+
+	__mon_event_count(closid, rmid, &rr);
+
+	/*
+	 * If the software controller is enabled, compute the
+	 * bandwidth for this event id.
+	 */
+	if (is_mba_sc(NULL))
+		mbm_bw_count(closid, rmid, &rr);
+
+	resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
+}
+
+static void mbm_update(struct rdt_resource *r, struct rdt_mon_domain *d,
+		       u32 closid, u32 rmid)
+{
+	/*
+	 * This is protected from concurrent reads from user as both
+	 * the user and overflow handler hold the global mutex.
+	 */
+	if (resctrl_arch_is_mbm_total_enabled())
+		mbm_update_one_event(r, d, closid, rmid, QOS_L3_MBM_TOTAL_EVENT_ID);
+
+	if (resctrl_arch_is_mbm_local_enabled())
+		mbm_update_one_event(r, d, closid, rmid, QOS_L3_MBM_LOCAL_EVENT_ID);
+}
+
+/*
+ * Handler to scan the limbo list and move the RMIDs
+ * to free list whose occupancy < threshold_occupancy.
+ */
+void cqm_handle_limbo(struct work_struct *work)
+{
+	unsigned long delay = msecs_to_jiffies(CQM_LIMBOCHECK_INTERVAL);
+	struct rdt_mon_domain *d;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	d = container_of(work, struct rdt_mon_domain, cqm_limbo.work);
+
+	__check_limbo(d, false);
+
+	if (has_busy_rmid(d)) {
+		d->cqm_work_cpu = cpumask_any_housekeeping(&d->hdr.cpu_mask,
+							   RESCTRL_PICK_ANY_CPU);
+		schedule_delayed_work_on(d->cqm_work_cpu, &d->cqm_limbo,
+					 delay);
+	}
+
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+}
+
+/**
+ * cqm_setup_limbo_handler() - Schedule the limbo handler to run for this
+ *                             domain.
+ * @dom:           The domain the limbo handler should run for.
+ * @delay_ms:      How far in the future the handler should run.
+ * @exclude_cpu:   Which CPU the handler should not run on,
+ *		   RESCTRL_PICK_ANY_CPU to pick any CPU.
+ */
+void cqm_setup_limbo_handler(struct rdt_mon_domain *dom, unsigned long delay_ms,
+			     int exclude_cpu)
+{
+	unsigned long delay = msecs_to_jiffies(delay_ms);
+	int cpu;
+
+	cpu = cpumask_any_housekeeping(&dom->hdr.cpu_mask, exclude_cpu);
+	dom->cqm_work_cpu = cpu;
+
+	if (cpu < nr_cpu_ids)
+		schedule_delayed_work_on(cpu, &dom->cqm_limbo, delay);
+}
+
+void mbm_handle_overflow(struct work_struct *work)
+{
+	unsigned long delay = msecs_to_jiffies(MBM_OVERFLOW_INTERVAL);
+	struct rdtgroup *prgrp, *crgrp;
+	struct rdt_mon_domain *d;
+	struct list_head *head;
+	struct rdt_resource *r;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	/*
+	 * If the filesystem has been unmounted this work no longer needs to
+	 * run.
+	 */
+	if (!resctrl_mounted || !resctrl_arch_mon_capable())
+		goto out_unlock;
+
+	r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	d = container_of(work, struct rdt_mon_domain, mbm_over.work);
+
+	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
+		mbm_update(r, d, prgrp->closid, prgrp->mon.rmid);
+
+		head = &prgrp->mon.crdtgrp_list;
+		list_for_each_entry(crgrp, head, mon.crdtgrp_list)
+			mbm_update(r, d, crgrp->closid, crgrp->mon.rmid);
+
+		if (is_mba_sc(NULL))
+			update_mba_bw(prgrp, d);
+	}
+
+	/*
+	 * Re-check for housekeeping CPUs. This allows the overflow handler to
+	 * move off a nohz_full CPU quickly.
+	 */
+	d->mbm_work_cpu = cpumask_any_housekeeping(&d->hdr.cpu_mask,
+						   RESCTRL_PICK_ANY_CPU);
+	schedule_delayed_work_on(d->mbm_work_cpu, &d->mbm_over, delay);
+
+out_unlock:
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+}
+
+/**
+ * mbm_setup_overflow_handler() - Schedule the overflow handler to run for this
+ *                                domain.
+ * @dom:           The domain the overflow handler should run for.
+ * @delay_ms:      How far in the future the handler should run.
+ * @exclude_cpu:   Which CPU the handler should not run on,
+ *		   RESCTRL_PICK_ANY_CPU to pick any CPU.
+ */
+void mbm_setup_overflow_handler(struct rdt_mon_domain *dom, unsigned long delay_ms,
+				int exclude_cpu)
+{
+	unsigned long delay = msecs_to_jiffies(delay_ms);
+	int cpu;
+
+	/*
+	 * When a domain comes online there is no guarantee the filesystem is
+	 * mounted. If not, there is no need to catch counter overflow.
+	 */
+	if (!resctrl_mounted || !resctrl_arch_mon_capable())
+		return;
+	cpu = cpumask_any_housekeeping(&dom->hdr.cpu_mask, exclude_cpu);
+	dom->mbm_work_cpu = cpu;
+
+	if (cpu < nr_cpu_ids)
+		schedule_delayed_work_on(cpu, &dom->mbm_over, delay);
+}
+
+static int dom_data_init(struct rdt_resource *r)
+{
+	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
+	u32 num_closid = resctrl_arch_get_num_closid(r);
+	struct rmid_entry *entry = NULL;
+	int err = 0, i;
+	u32 idx;
+
+	mutex_lock(&rdtgroup_mutex);
+	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
+		u32 *tmp;
+
+		/*
+		 * If the architecture hasn't provided a sanitised value here,
+		 * this may result in larger arrays than necessary. Resctrl will
+		 * use a smaller system wide value based on the resources in
+		 * use.
+		 */
+		tmp = kcalloc(num_closid, sizeof(*tmp), GFP_KERNEL);
+		if (!tmp) {
+			err = -ENOMEM;
+			goto out_unlock;
+		}
+
+		closid_num_dirty_rmid = tmp;
+	}
+
+	rmid_ptrs = kcalloc(idx_limit, sizeof(struct rmid_entry), GFP_KERNEL);
+	if (!rmid_ptrs) {
+		if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
+			kfree(closid_num_dirty_rmid);
+			closid_num_dirty_rmid = NULL;
+		}
+		err = -ENOMEM;
+		goto out_unlock;
+	}
+
+	for (i = 0; i < idx_limit; i++) {
+		entry = &rmid_ptrs[i];
+		INIT_LIST_HEAD(&entry->list);
+
+		resctrl_arch_rmid_idx_decode(i, &entry->closid, &entry->rmid);
+		list_add_tail(&entry->list, &rmid_free_lru);
+	}
+
+	/*
+	 * RESCTRL_RESERVED_CLOSID and RESCTRL_RESERVED_RMID are special and
+	 * are always allocated. These are used for the rdtgroup_default
+	 * control group, which will be setup later in resctrl_init().
+	 */
+	idx = resctrl_arch_rmid_idx_encode(RESCTRL_RESERVED_CLOSID,
+					   RESCTRL_RESERVED_RMID);
+	entry = __rmid_entry(idx);
+	list_del(&entry->list);
+
+out_unlock:
+	mutex_unlock(&rdtgroup_mutex);
+
+	return err;
+}
+
+static void dom_data_exit(struct rdt_resource *r)
+{
+	mutex_lock(&rdtgroup_mutex);
+
+	if (!r->mon_capable)
+		goto out_unlock;
+
+	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
+		kfree(closid_num_dirty_rmid);
+		closid_num_dirty_rmid = NULL;
+	}
+
+	kfree(rmid_ptrs);
+	rmid_ptrs = NULL;
+
+out_unlock:
+	mutex_unlock(&rdtgroup_mutex);
+}
+
+static struct mon_evt llc_occupancy_event = {
+	.name		= "llc_occupancy",
+	.evtid		= QOS_L3_OCCUP_EVENT_ID,
+};
+
+static struct mon_evt mbm_total_event = {
+	.name		= "mbm_total_bytes",
+	.evtid		= QOS_L3_MBM_TOTAL_EVENT_ID,
+};
+
+static struct mon_evt mbm_local_event = {
+	.name		= "mbm_local_bytes",
+	.evtid		= QOS_L3_MBM_LOCAL_EVENT_ID,
+};
+
+/*
+ * Initialize the event list for the resource.
+ *
+ * Note that MBM events are also part of RDT_RESOURCE_L3 resource
+ * because as per the SDM the total and local memory bandwidth
+ * are enumerated as part of L3 monitoring.
+ */
+static void l3_mon_evt_init(struct rdt_resource *r)
+{
+	INIT_LIST_HEAD(&r->evt_list);
+
+	if (resctrl_arch_is_llc_occupancy_enabled())
+		list_add_tail(&llc_occupancy_event.list, &r->evt_list);
+	if (resctrl_arch_is_mbm_total_enabled())
+		list_add_tail(&mbm_total_event.list, &r->evt_list);
+	if (resctrl_arch_is_mbm_local_enabled())
+		list_add_tail(&mbm_local_event.list, &r->evt_list);
+}
+
+/**
+ * resctrl_mon_resource_init() - Initialise global monitoring structures.
+ *
+ * Allocate and initialise global monitor resources that do not belong to a
+ * specific domain. i.e. the rmid_ptrs[] used for the limbo and free lists.
+ * Called once during boot after the struct rdt_resource's have been configured
+ * but before the filesystem is mounted.
+ * Resctrl's cpuhp callbacks may be called before this point to bring a domain
+ * online.
+ *
+ * Returns 0 for success, or -ENOMEM.
+ */
+int resctrl_mon_resource_init(void)
+{
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	int ret;
+
+	if (!r->mon_capable)
+		return 0;
+
+	ret = dom_data_init(r);
+	if (ret)
+		return ret;
+
+	l3_mon_evt_init(r);
+
+	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_TOTAL_EVENT_ID)) {
+		mbm_total_event.configurable = true;
+		resctrl_file_fflags_init("mbm_total_bytes_config",
+					 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
+	}
+	if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_LOCAL_EVENT_ID)) {
+		mbm_local_event.configurable = true;
+		resctrl_file_fflags_init("mbm_local_bytes_config",
+					 RFTYPE_MON_INFO | RFTYPE_RES_CACHE);
+	}
+
+	if (resctrl_arch_is_mbm_local_enabled())
+		mba_mbps_default_event = QOS_L3_MBM_LOCAL_EVENT_ID;
+	else if (resctrl_arch_is_mbm_total_enabled())
+		mba_mbps_default_event = QOS_L3_MBM_TOTAL_EVENT_ID;
+
+	return 0;
+}
+
+void resctrl_mon_resource_exit(void)
+{
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+
+	dom_data_exit(r);
+}
diff --git a/fs/resctrl/monitor_trace.h b/fs/resctrl/monitor_trace.h
index e69de29bb2d1..fdf49f22576a 100644
--- a/fs/resctrl/monitor_trace.h
+++ b/fs/resctrl/monitor_trace.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM resctrl
+
+#if !defined(_FS_RESCTRL_MONITOR_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _FS_RESCTRL_MONITOR_TRACE_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(mon_llc_occupancy_limbo,
+	    TP_PROTO(u32 ctrl_hw_id, u32 mon_hw_id, int domain_id, u64 llc_occupancy_bytes),
+	    TP_ARGS(ctrl_hw_id, mon_hw_id, domain_id, llc_occupancy_bytes),
+	    TP_STRUCT__entry(__field(u32, ctrl_hw_id)
+			     __field(u32, mon_hw_id)
+			     __field(int, domain_id)
+			     __field(u64, llc_occupancy_bytes)),
+	    TP_fast_assign(__entry->ctrl_hw_id = ctrl_hw_id;
+			   __entry->mon_hw_id = mon_hw_id;
+			   __entry->domain_id = domain_id;
+			   __entry->llc_occupancy_bytes = llc_occupancy_bytes;),
+	    TP_printk("ctrl_hw_id=%u mon_hw_id=%u domain_id=%d llc_occupancy_bytes=%llu",
+		      __entry->ctrl_hw_id, __entry->mon_hw_id, __entry->domain_id,
+		      __entry->llc_occupancy_bytes)
+	   );
+
+#endif /* _FS_RESCTRL_MONITOR_TRACE_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+
+#define TRACE_INCLUDE_FILE monitor_trace
+
+#include <trace/define_trace.h>
diff --git a/fs/resctrl/pseudo_lock.c b/fs/resctrl/pseudo_lock.c
index e69de29bb2d1..5bbeb8416fa6 100644
--- a/fs/resctrl/pseudo_lock.c
+++ b/fs/resctrl/pseudo_lock.c
@@ -0,0 +1,1106 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Resource Director Technology (RDT)
+ *
+ * Pseudo-locking support built on top of Cache Allocation Technology (CAT)
+ *
+ * Copyright (C) 2018 Intel Corporation
+ *
+ * Author: Reinette Chatre <reinette.chatre@intel.com>
+ */
+
+#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
+
+#include <linux/cacheinfo.h>
+#include <linux/cpu.h>
+#include <linux/cpumask.h>
+#include <linux/debugfs.h>
+#include <linux/kthread.h>
+#include <linux/mman.h>
+#include <linux/pm_qos.h>
+#include <linux/resctrl.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#include "internal.h"
+
+/*
+ * Major number assigned to and shared by all devices exposing
+ * pseudo-locked regions.
+ */
+static unsigned int pseudo_lock_major;
+
+static unsigned long pseudo_lock_minor_avail = GENMASK(MINORBITS, 0);
+
+static char *pseudo_lock_devnode(const struct device *dev, umode_t *mode)
+{
+	const struct rdtgroup *rdtgrp;
+
+	rdtgrp = dev_get_drvdata(dev);
+	if (mode)
+		*mode = 0600;
+	guard(mutex)(&rdtgroup_mutex);
+	return kasprintf(GFP_KERNEL, "pseudo_lock/%s", rdt_kn_name(rdtgrp->kn));
+}
+
+static const struct class pseudo_lock_class = {
+	.name = "pseudo_lock",
+	.devnode = pseudo_lock_devnode,
+};
+
+/**
+ * pseudo_lock_minor_get - Obtain available minor number
+ * @minor: Pointer to where new minor number will be stored
+ *
+ * A bitmask is used to track available minor numbers. Here the next free
+ * minor number is marked as unavailable and returned.
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+static int pseudo_lock_minor_get(unsigned int *minor)
+{
+	unsigned long first_bit;
+
+	first_bit = find_first_bit(&pseudo_lock_minor_avail, MINORBITS);
+
+	if (first_bit == MINORBITS)
+		return -ENOSPC;
+
+	__clear_bit(first_bit, &pseudo_lock_minor_avail);
+	*minor = first_bit;
+
+	return 0;
+}
+
+/**
+ * pseudo_lock_minor_release - Return minor number to available
+ * @minor: The minor number made available
+ */
+static void pseudo_lock_minor_release(unsigned int minor)
+{
+	__set_bit(minor, &pseudo_lock_minor_avail);
+}
+
+/**
+ * region_find_by_minor - Locate a pseudo-lock region by inode minor number
+ * @minor: The minor number of the device representing pseudo-locked region
+ *
+ * When the character device is accessed we need to determine which
+ * pseudo-locked region it belongs to. This is done by matching the minor
+ * number of the device to the pseudo-locked region it belongs.
+ *
+ * Minor numbers are assigned at the time a pseudo-locked region is associated
+ * with a cache instance.
+ *
+ * Return: On success return pointer to resource group owning the pseudo-locked
+ *         region, NULL on failure.
+ */
+static struct rdtgroup *region_find_by_minor(unsigned int minor)
+{
+	struct rdtgroup *rdtgrp, *rdtgrp_match = NULL;
+
+	list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
+		if (rdtgrp->plr && rdtgrp->plr->minor == minor) {
+			rdtgrp_match = rdtgrp;
+			break;
+		}
+	}
+	return rdtgrp_match;
+}
+
+/**
+ * struct pseudo_lock_pm_req - A power management QoS request list entry
+ * @list:	Entry within the @pm_reqs list for a pseudo-locked region
+ * @req:	PM QoS request
+ */
+struct pseudo_lock_pm_req {
+	struct list_head list;
+	struct dev_pm_qos_request req;
+};
+
+static void pseudo_lock_cstates_relax(struct pseudo_lock_region *plr)
+{
+	struct pseudo_lock_pm_req *pm_req, *next;
+
+	list_for_each_entry_safe(pm_req, next, &plr->pm_reqs, list) {
+		dev_pm_qos_remove_request(&pm_req->req);
+		list_del(&pm_req->list);
+		kfree(pm_req);
+	}
+}
+
+/**
+ * pseudo_lock_cstates_constrain - Restrict cores from entering C6
+ * @plr: Pseudo-locked region
+ *
+ * To prevent the cache from being affected by power management entering
+ * C6 has to be avoided. This is accomplished by requesting a latency
+ * requirement lower than lowest C6 exit latency of all supported
+ * platforms as found in the cpuidle state tables in the intel_idle driver.
+ * At this time it is possible to do so with a single latency requirement
+ * for all supported platforms.
+ *
+ * Since Goldmont is supported, which is affected by X86_BUG_MONITOR,
+ * the ACPI latencies need to be considered while keeping in mind that C2
+ * may be set to map to deeper sleep states. In this case the latency
+ * requirement needs to prevent entering C2 also.
+ *
+ * Return: 0 on success, <0 on failure
+ */
+static int pseudo_lock_cstates_constrain(struct pseudo_lock_region *plr)
+{
+	struct pseudo_lock_pm_req *pm_req;
+	int cpu;
+	int ret;
+
+	for_each_cpu(cpu, &plr->d->hdr.cpu_mask) {
+		pm_req = kzalloc(sizeof(*pm_req), GFP_KERNEL);
+		if (!pm_req) {
+			rdt_last_cmd_puts("Failure to allocate memory for PM QoS\n");
+			ret = -ENOMEM;
+			goto out_err;
+		}
+		ret = dev_pm_qos_add_request(get_cpu_device(cpu),
+					     &pm_req->req,
+					     DEV_PM_QOS_RESUME_LATENCY,
+					     30);
+		if (ret < 0) {
+			rdt_last_cmd_printf("Failed to add latency req CPU%d\n",
+					    cpu);
+			kfree(pm_req);
+			ret = -1;
+			goto out_err;
+		}
+		list_add(&pm_req->list, &plr->pm_reqs);
+	}
+
+	return 0;
+
+out_err:
+	pseudo_lock_cstates_relax(plr);
+	return ret;
+}
+
+/**
+ * pseudo_lock_region_clear - Reset pseudo-lock region data
+ * @plr: pseudo-lock region
+ *
+ * All content of the pseudo-locked region is reset - any memory allocated
+ * freed.
+ *
+ * Return: void
+ */
+static void pseudo_lock_region_clear(struct pseudo_lock_region *plr)
+{
+	plr->size = 0;
+	plr->line_size = 0;
+	kfree(plr->kmem);
+	plr->kmem = NULL;
+	plr->s = NULL;
+	if (plr->d)
+		plr->d->plr = NULL;
+	plr->d = NULL;
+	plr->cbm = 0;
+	plr->debugfs_dir = NULL;
+}
+
+/**
+ * pseudo_lock_region_init - Initialize pseudo-lock region information
+ * @plr: pseudo-lock region
+ *
+ * Called after user provided a schemata to be pseudo-locked. From the
+ * schemata the &struct pseudo_lock_region is on entry already initialized
+ * with the resource, domain, and capacity bitmask. Here the information
+ * required for pseudo-locking is deduced from this data and &struct
+ * pseudo_lock_region initialized further. This information includes:
+ * - size in bytes of the region to be pseudo-locked
+ * - cache line size to know the stride with which data needs to be accessed
+ *   to be pseudo-locked
+ * - a cpu associated with the cache instance on which the pseudo-locking
+ *   flow can be executed
+ *
+ * Return: 0 on success, <0 on failure. Descriptive error will be written
+ * to last_cmd_status buffer.
+ */
+static int pseudo_lock_region_init(struct pseudo_lock_region *plr)
+{
+	enum resctrl_scope scope = plr->s->res->ctrl_scope;
+	struct cacheinfo *ci;
+	int ret;
+
+	if (WARN_ON_ONCE(scope != RESCTRL_L2_CACHE && scope != RESCTRL_L3_CACHE))
+		return -ENODEV;
+
+	/* Pick the first cpu we find that is associated with the cache. */
+	plr->cpu = cpumask_first(&plr->d->hdr.cpu_mask);
+
+	if (!cpu_online(plr->cpu)) {
+		rdt_last_cmd_printf("CPU %u associated with cache not online\n",
+				    plr->cpu);
+		ret = -ENODEV;
+		goto out_region;
+	}
+
+	ci = get_cpu_cacheinfo_level(plr->cpu, scope);
+	if (ci) {
+		plr->line_size = ci->coherency_line_size;
+		plr->size = rdtgroup_cbm_to_size(plr->s->res, plr->d, plr->cbm);
+		return 0;
+	}
+
+	ret = -1;
+	rdt_last_cmd_puts("Unable to determine cache line size\n");
+out_region:
+	pseudo_lock_region_clear(plr);
+	return ret;
+}
+
+/**
+ * pseudo_lock_init - Initialize a pseudo-lock region
+ * @rdtgrp: resource group to which new pseudo-locked region will belong
+ *
+ * A pseudo-locked region is associated with a resource group. When this
+ * association is created the pseudo-locked region is initialized. The
+ * details of the pseudo-locked region are not known at this time so only
+ * allocation is done and association established.
+ *
+ * Return: 0 on success, <0 on failure
+ */
+static int pseudo_lock_init(struct rdtgroup *rdtgrp)
+{
+	struct pseudo_lock_region *plr;
+
+	plr = kzalloc(sizeof(*plr), GFP_KERNEL);
+	if (!plr)
+		return -ENOMEM;
+
+	init_waitqueue_head(&plr->lock_thread_wq);
+	INIT_LIST_HEAD(&plr->pm_reqs);
+	rdtgrp->plr = plr;
+	return 0;
+}
+
+/**
+ * pseudo_lock_region_alloc - Allocate kernel memory that will be pseudo-locked
+ * @plr: pseudo-lock region
+ *
+ * Initialize the details required to set up the pseudo-locked region and
+ * allocate the contiguous memory that will be pseudo-locked to the cache.
+ *
+ * Return: 0 on success, <0 on failure.  Descriptive error will be written
+ * to last_cmd_status buffer.
+ */
+static int pseudo_lock_region_alloc(struct pseudo_lock_region *plr)
+{
+	int ret;
+
+	ret = pseudo_lock_region_init(plr);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * We do not yet support contiguous regions larger than
+	 * KMALLOC_MAX_SIZE.
+	 */
+	if (plr->size > KMALLOC_MAX_SIZE) {
+		rdt_last_cmd_puts("Requested region exceeds maximum size\n");
+		ret = -E2BIG;
+		goto out_region;
+	}
+
+	plr->kmem = kzalloc(plr->size, GFP_KERNEL);
+	if (!plr->kmem) {
+		rdt_last_cmd_puts("Unable to allocate memory\n");
+		ret = -ENOMEM;
+		goto out_region;
+	}
+
+	ret = 0;
+	goto out;
+out_region:
+	pseudo_lock_region_clear(plr);
+out:
+	return ret;
+}
+
+/**
+ * pseudo_lock_free - Free a pseudo-locked region
+ * @rdtgrp: resource group to which pseudo-locked region belonged
+ *
+ * The pseudo-locked region's resources have already been released, or not
+ * yet created at this point. Now it can be freed and disassociated from the
+ * resource group.
+ *
+ * Return: void
+ */
+static void pseudo_lock_free(struct rdtgroup *rdtgrp)
+{
+	pseudo_lock_region_clear(rdtgrp->plr);
+	kfree(rdtgrp->plr);
+	rdtgrp->plr = NULL;
+}
+
+/**
+ * rdtgroup_monitor_in_progress - Test if monitoring in progress
+ * @rdtgrp: resource group being queried
+ *
+ * Return: 1 if monitor groups have been created for this resource
+ * group, 0 otherwise.
+ */
+static int rdtgroup_monitor_in_progress(struct rdtgroup *rdtgrp)
+{
+	return !list_empty(&rdtgrp->mon.crdtgrp_list);
+}
+
+/**
+ * rdtgroup_locksetup_user_restrict - Restrict user access to group
+ * @rdtgrp: resource group needing access restricted
+ *
+ * A resource group used for cache pseudo-locking cannot have cpus or tasks
+ * assigned to it. This is communicated to the user by restricting access
+ * to all the files that can be used to make such changes.
+ *
+ * Permissions restored with rdtgroup_locksetup_user_restore()
+ *
+ * Return: 0 on success, <0 on failure. If a failure occurs during the
+ * restriction of access an attempt will be made to restore permissions but
+ * the state of the mode of these files will be uncertain when a failure
+ * occurs.
+ */
+static int rdtgroup_locksetup_user_restrict(struct rdtgroup *rdtgrp)
+{
+	int ret;
+
+	ret = rdtgroup_kn_mode_restrict(rdtgrp, "tasks");
+	if (ret)
+		return ret;
+
+	ret = rdtgroup_kn_mode_restrict(rdtgrp, "cpus");
+	if (ret)
+		goto err_tasks;
+
+	ret = rdtgroup_kn_mode_restrict(rdtgrp, "cpus_list");
+	if (ret)
+		goto err_cpus;
+
+	if (resctrl_arch_mon_capable()) {
+		ret = rdtgroup_kn_mode_restrict(rdtgrp, "mon_groups");
+		if (ret)
+			goto err_cpus_list;
+	}
+
+	ret = 0;
+	goto out;
+
+err_cpus_list:
+	rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0777);
+err_cpus:
+	rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0777);
+err_tasks:
+	rdtgroup_kn_mode_restore(rdtgrp, "tasks", 0777);
+out:
+	return ret;
+}
+
+/**
+ * rdtgroup_locksetup_user_restore - Restore user access to group
+ * @rdtgrp: resource group needing access restored
+ *
+ * Restore all file access previously removed using
+ * rdtgroup_locksetup_user_restrict()
+ *
+ * Return: 0 on success, <0 on failure.  If a failure occurs during the
+ * restoration of access an attempt will be made to restrict permissions
+ * again but the state of the mode of these files will be uncertain when
+ * a failure occurs.
+ */
+static int rdtgroup_locksetup_user_restore(struct rdtgroup *rdtgrp)
+{
+	int ret;
+
+	ret = rdtgroup_kn_mode_restore(rdtgrp, "tasks", 0777);
+	if (ret)
+		return ret;
+
+	ret = rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0777);
+	if (ret)
+		goto err_tasks;
+
+	ret = rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0777);
+	if (ret)
+		goto err_cpus;
+
+	if (resctrl_arch_mon_capable()) {
+		ret = rdtgroup_kn_mode_restore(rdtgrp, "mon_groups", 0777);
+		if (ret)
+			goto err_cpus_list;
+	}
+
+	ret = 0;
+	goto out;
+
+err_cpus_list:
+	rdtgroup_kn_mode_restrict(rdtgrp, "cpus_list");
+err_cpus:
+	rdtgroup_kn_mode_restrict(rdtgrp, "cpus");
+err_tasks:
+	rdtgroup_kn_mode_restrict(rdtgrp, "tasks");
+out:
+	return ret;
+}
+
+/**
+ * rdtgroup_locksetup_enter - Resource group enters locksetup mode
+ * @rdtgrp: resource group requested to enter locksetup mode
+ *
+ * A resource group enters locksetup mode to reflect that it would be used
+ * to represent a pseudo-locked region and is in the process of being set
+ * up to do so. A resource group used for a pseudo-locked region would
+ * lose the closid associated with it so we cannot allow it to have any
+ * tasks or cpus assigned nor permit tasks or cpus to be assigned in the
+ * future. Monitoring of a pseudo-locked region is not allowed either.
+ *
+ * The above and more restrictions on a pseudo-locked region are checked
+ * for and enforced before the resource group enters the locksetup mode.
+ *
+ * Returns: 0 if the resource group successfully entered locksetup mode, <0
+ * on failure. On failure the last_cmd_status buffer is updated with text to
+ * communicate details of failure to the user.
+ */
+int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp)
+{
+	int ret;
+
+	/*
+	 * The default resource group can neither be removed nor lose the
+	 * default closid associated with it.
+	 */
+	if (rdtgrp == &rdtgroup_default) {
+		rdt_last_cmd_puts("Cannot pseudo-lock default group\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Cache Pseudo-locking not supported when CDP is enabled.
+	 *
+	 * Some things to consider if you would like to enable this
+	 * support (using L3 CDP as example):
+	 * - When CDP is enabled two separate resources are exposed,
+	 *   L3DATA and L3CODE, but they are actually on the same cache.
+	 *   The implication for pseudo-locking is that if a
+	 *   pseudo-locked region is created on a domain of one
+	 *   resource (eg. L3CODE), then a pseudo-locked region cannot
+	 *   be created on that same domain of the other resource
+	 *   (eg. L3DATA). This is because the creation of a
+	 *   pseudo-locked region involves a call to wbinvd that will
+	 *   affect all cache allocations on particular domain.
+	 * - Considering the previous, it may be possible to only
+	 *   expose one of the CDP resources to pseudo-locking and
+	 *   hide the other. For example, we could consider to only
+	 *   expose L3DATA and since the L3 cache is unified it is
+	 *   still possible to place instructions there are execute it.
+	 * - If only one region is exposed to pseudo-locking we should
+	 *   still keep in mind that availability of a portion of cache
+	 *   for pseudo-locking should take into account both resources.
+	 *   Similarly, if a pseudo-locked region is created in one
+	 *   resource, the portion of cache used by it should be made
+	 *   unavailable to all future allocations from both resources.
+	 */
+	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3) ||
+	    resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2)) {
+		rdt_last_cmd_puts("CDP enabled\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Not knowing the bits to disable prefetching implies that this
+	 * platform does not support Cache Pseudo-Locking.
+	 */
+	if (resctrl_arch_get_prefetch_disable_bits() == 0) {
+		rdt_last_cmd_puts("Pseudo-locking not supported\n");
+		return -EINVAL;
+	}
+
+	if (rdtgroup_monitor_in_progress(rdtgrp)) {
+		rdt_last_cmd_puts("Monitoring in progress\n");
+		return -EINVAL;
+	}
+
+	if (rdtgroup_tasks_assigned(rdtgrp)) {
+		rdt_last_cmd_puts("Tasks assigned to resource group\n");
+		return -EINVAL;
+	}
+
+	if (!cpumask_empty(&rdtgrp->cpu_mask)) {
+		rdt_last_cmd_puts("CPUs assigned to resource group\n");
+		return -EINVAL;
+	}
+
+	if (rdtgroup_locksetup_user_restrict(rdtgrp)) {
+		rdt_last_cmd_puts("Unable to modify resctrl permissions\n");
+		return -EIO;
+	}
+
+	ret = pseudo_lock_init(rdtgrp);
+	if (ret) {
+		rdt_last_cmd_puts("Unable to init pseudo-lock region\n");
+		goto out_release;
+	}
+
+	/*
+	 * If this system is capable of monitoring a rmid would have been
+	 * allocated when the control group was created. This is not needed
+	 * anymore when this group would be used for pseudo-locking. This
+	 * is safe to call on platforms not capable of monitoring.
+	 */
+	free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+
+	ret = 0;
+	goto out;
+
+out_release:
+	rdtgroup_locksetup_user_restore(rdtgrp);
+out:
+	return ret;
+}
+
+/**
+ * rdtgroup_locksetup_exit - resource group exist locksetup mode
+ * @rdtgrp: resource group
+ *
+ * When a resource group exits locksetup mode the earlier restrictions are
+ * lifted.
+ *
+ * Return: 0 on success, <0 on failure
+ */
+int rdtgroup_locksetup_exit(struct rdtgroup *rdtgrp)
+{
+	int ret;
+
+	if (resctrl_arch_mon_capable()) {
+		ret = alloc_rmid(rdtgrp->closid);
+		if (ret < 0) {
+			rdt_last_cmd_puts("Out of RMIDs\n");
+			return ret;
+		}
+		rdtgrp->mon.rmid = ret;
+	}
+
+	ret = rdtgroup_locksetup_user_restore(rdtgrp);
+	if (ret) {
+		free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+		return ret;
+	}
+
+	pseudo_lock_free(rdtgrp);
+	return 0;
+}
+
+/**
+ * rdtgroup_cbm_overlaps_pseudo_locked - Test if CBM or portion is pseudo-locked
+ * @d: RDT domain
+ * @cbm: CBM to test
+ *
+ * @d represents a cache instance and @cbm a capacity bitmask that is
+ * considered for it. Determine if @cbm overlaps with any existing
+ * pseudo-locked region on @d.
+ *
+ * @cbm is unsigned long, even if only 32 bits are used, to make the
+ * bitmap functions work correctly.
+ *
+ * Return: true if @cbm overlaps with pseudo-locked region on @d, false
+ * otherwise.
+ */
+bool rdtgroup_cbm_overlaps_pseudo_locked(struct rdt_ctrl_domain *d, unsigned long cbm)
+{
+	unsigned int cbm_len;
+	unsigned long cbm_b;
+
+	if (d->plr) {
+		cbm_len = d->plr->s->res->cache.cbm_len;
+		cbm_b = d->plr->cbm;
+		if (bitmap_intersects(&cbm, &cbm_b, cbm_len))
+			return true;
+	}
+	return false;
+}
+
+/**
+ * rdtgroup_pseudo_locked_in_hierarchy - Pseudo-locked region in cache hierarchy
+ * @d: RDT domain under test
+ *
+ * The setup of a pseudo-locked region affects all cache instances within
+ * the hierarchy of the region. It is thus essential to know if any
+ * pseudo-locked regions exist within a cache hierarchy to prevent any
+ * attempts to create new pseudo-locked regions in the same hierarchy.
+ *
+ * Return: true if a pseudo-locked region exists in the hierarchy of @d or
+ *         if it is not possible to test due to memory allocation issue,
+ *         false otherwise.
+ */
+bool rdtgroup_pseudo_locked_in_hierarchy(struct rdt_ctrl_domain *d)
+{
+	struct rdt_ctrl_domain *d_i;
+	cpumask_var_t cpu_with_psl;
+	struct rdt_resource *r;
+	bool ret = false;
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	if (!zalloc_cpumask_var(&cpu_with_psl, GFP_KERNEL))
+		return true;
+
+	/*
+	 * First determine which cpus have pseudo-locked regions
+	 * associated with them.
+	 */
+	for_each_alloc_capable_rdt_resource(r) {
+		list_for_each_entry(d_i, &r->ctrl_domains, hdr.list) {
+			if (d_i->plr)
+				cpumask_or(cpu_with_psl, cpu_with_psl,
+					   &d_i->hdr.cpu_mask);
+		}
+	}
+
+	/*
+	 * Next test if new pseudo-locked region would intersect with
+	 * existing region.
+	 */
+	if (cpumask_intersects(&d->hdr.cpu_mask, cpu_with_psl))
+		ret = true;
+
+	free_cpumask_var(cpu_with_psl);
+	return ret;
+}
+
+/**
+ * pseudo_lock_measure_cycles - Trigger latency measure to pseudo-locked region
+ * @rdtgrp: Resource group to which the pseudo-locked region belongs.
+ * @sel: Selector of which measurement to perform on a pseudo-locked region.
+ *
+ * The measurement of latency to access a pseudo-locked region should be
+ * done from a cpu that is associated with that pseudo-locked region.
+ * Determine which cpu is associated with this region and start a thread on
+ * that cpu to perform the measurement, wait for that thread to complete.
+ *
+ * Return: 0 on success, <0 on failure
+ */
+static int pseudo_lock_measure_cycles(struct rdtgroup *rdtgrp, int sel)
+{
+	struct pseudo_lock_region *plr = rdtgrp->plr;
+	struct task_struct *thread;
+	unsigned int cpu;
+	int ret = -1;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	if (rdtgrp->flags & RDT_DELETED) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	if (!plr->d) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	plr->thread_done = 0;
+	cpu = cpumask_first(&plr->d->hdr.cpu_mask);
+	if (!cpu_online(cpu)) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	plr->cpu = cpu;
+
+	if (sel == 1)
+		thread = kthread_run_on_cpu(resctrl_arch_measure_cycles_lat_fn,
+					    plr, cpu, "pseudo_lock_measure/%u");
+	else if (sel == 2)
+		thread = kthread_run_on_cpu(resctrl_arch_measure_l2_residency,
+					    plr, cpu, "pseudo_lock_measure/%u");
+	else if (sel == 3)
+		thread = kthread_run_on_cpu(resctrl_arch_measure_l3_residency,
+					    plr, cpu, "pseudo_lock_measure/%u");
+	else
+		goto out;
+
+	if (IS_ERR(thread)) {
+		ret = PTR_ERR(thread);
+		goto out;
+	}
+
+	ret = wait_event_interruptible(plr->lock_thread_wq,
+				       plr->thread_done == 1);
+	if (ret < 0)
+		goto out;
+
+	ret = 0;
+
+out:
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+	return ret;
+}
+
+static ssize_t pseudo_lock_measure_trigger(struct file *file,
+					   const char __user *user_buf,
+					   size_t count, loff_t *ppos)
+{
+	struct rdtgroup *rdtgrp = file->private_data;
+	size_t buf_size;
+	char buf[32];
+	int ret;
+	int sel;
+
+	buf_size = min(count, (sizeof(buf) - 1));
+	if (copy_from_user(buf, user_buf, buf_size))
+		return -EFAULT;
+
+	buf[buf_size] = '\0';
+	ret = kstrtoint(buf, 10, &sel);
+	if (ret == 0) {
+		if (sel != 1 && sel != 2 && sel != 3)
+			return -EINVAL;
+		ret = debugfs_file_get(file->f_path.dentry);
+		if (ret)
+			return ret;
+		ret = pseudo_lock_measure_cycles(rdtgrp, sel);
+		if (ret == 0)
+			ret = count;
+		debugfs_file_put(file->f_path.dentry);
+	}
+
+	return ret;
+}
+
+static const struct file_operations pseudo_measure_fops = {
+	.write = pseudo_lock_measure_trigger,
+	.open = simple_open,
+	.llseek = default_llseek,
+};
+
+/**
+ * rdtgroup_pseudo_lock_create - Create a pseudo-locked region
+ * @rdtgrp: resource group to which pseudo-lock region belongs
+ *
+ * Called when a resource group in the pseudo-locksetup mode receives a
+ * valid schemata that should be pseudo-locked. Since the resource group is
+ * in pseudo-locksetup mode the &struct pseudo_lock_region has already been
+ * allocated and initialized with the essential information. If a failure
+ * occurs the resource group remains in the pseudo-locksetup mode with the
+ * &struct pseudo_lock_region associated with it, but cleared from all
+ * information and ready for the user to re-attempt pseudo-locking by
+ * writing the schemata again.
+ *
+ * Return: 0 if the pseudo-locked region was successfully pseudo-locked, <0
+ * on failure. Descriptive error will be written to last_cmd_status buffer.
+ */
+int rdtgroup_pseudo_lock_create(struct rdtgroup *rdtgrp)
+{
+	struct pseudo_lock_region *plr = rdtgrp->plr;
+	struct task_struct *thread;
+	unsigned int new_minor;
+	struct device *dev;
+	char *kn_name __free(kfree) = NULL;
+	int ret;
+
+	ret = pseudo_lock_region_alloc(plr);
+	if (ret < 0)
+		return ret;
+
+	ret = pseudo_lock_cstates_constrain(plr);
+	if (ret < 0) {
+		ret = -EINVAL;
+		goto out_region;
+	}
+	kn_name = kstrdup(rdt_kn_name(rdtgrp->kn), GFP_KERNEL);
+	if (!kn_name) {
+		ret = -ENOMEM;
+		goto out_cstates;
+	}
+
+	plr->thread_done = 0;
+
+	thread = kthread_run_on_cpu(resctrl_arch_pseudo_lock_fn, plr,
+				    plr->cpu, "pseudo_lock/%u");
+	if (IS_ERR(thread)) {
+		ret = PTR_ERR(thread);
+		rdt_last_cmd_printf("Locking thread returned error %d\n", ret);
+		goto out_cstates;
+	}
+
+	ret = wait_event_interruptible(plr->lock_thread_wq,
+				       plr->thread_done == 1);
+	if (ret < 0) {
+		/*
+		 * If the thread does not get on the CPU for whatever
+		 * reason and the process which sets up the region is
+		 * interrupted then this will leave the thread in runnable
+		 * state and once it gets on the CPU it will dereference
+		 * the cleared, but not freed, plr struct resulting in an
+		 * empty pseudo-locking loop.
+		 */
+		rdt_last_cmd_puts("Locking thread interrupted\n");
+		goto out_cstates;
+	}
+
+	ret = pseudo_lock_minor_get(&new_minor);
+	if (ret < 0) {
+		rdt_last_cmd_puts("Unable to obtain a new minor number\n");
+		goto out_cstates;
+	}
+
+	/*
+	 * Unlock access but do not release the reference. The
+	 * pseudo-locked region will still be here on return.
+	 *
+	 * The mutex has to be released temporarily to avoid a potential
+	 * deadlock with the mm->mmap_lock which is obtained in the
+	 * device_create() and debugfs_create_dir() callpath below as well as
+	 * before the mmap() callback is called.
+	 */
+	mutex_unlock(&rdtgroup_mutex);
+
+	if (!IS_ERR_OR_NULL(debugfs_resctrl)) {
+		plr->debugfs_dir = debugfs_create_dir(kn_name, debugfs_resctrl);
+		if (!IS_ERR_OR_NULL(plr->debugfs_dir))
+			debugfs_create_file("pseudo_lock_measure", 0200,
+					    plr->debugfs_dir, rdtgrp,
+					    &pseudo_measure_fops);
+	}
+
+	dev = device_create(&pseudo_lock_class, NULL,
+			    MKDEV(pseudo_lock_major, new_minor),
+			    rdtgrp, "%s", kn_name);
+
+	mutex_lock(&rdtgroup_mutex);
+
+	if (IS_ERR(dev)) {
+		ret = PTR_ERR(dev);
+		rdt_last_cmd_printf("Failed to create character device: %d\n",
+				    ret);
+		goto out_debugfs;
+	}
+
+	/* We released the mutex - check if group was removed while we did so */
+	if (rdtgrp->flags & RDT_DELETED) {
+		ret = -ENODEV;
+		goto out_device;
+	}
+
+	plr->minor = new_minor;
+
+	rdtgrp->mode = RDT_MODE_PSEUDO_LOCKED;
+	closid_free(rdtgrp->closid);
+	rdtgroup_kn_mode_restore(rdtgrp, "cpus", 0444);
+	rdtgroup_kn_mode_restore(rdtgrp, "cpus_list", 0444);
+
+	ret = 0;
+	goto out;
+
+out_device:
+	device_destroy(&pseudo_lock_class, MKDEV(pseudo_lock_major, new_minor));
+out_debugfs:
+	debugfs_remove_recursive(plr->debugfs_dir);
+	pseudo_lock_minor_release(new_minor);
+out_cstates:
+	pseudo_lock_cstates_relax(plr);
+out_region:
+	pseudo_lock_region_clear(plr);
+out:
+	return ret;
+}
+
+/**
+ * rdtgroup_pseudo_lock_remove - Remove a pseudo-locked region
+ * @rdtgrp: resource group to which the pseudo-locked region belongs
+ *
+ * The removal of a pseudo-locked region can be initiated when the resource
+ * group is removed from user space via a "rmdir" from userspace or the
+ * unmount of the resctrl filesystem. On removal the resource group does
+ * not go back to pseudo-locksetup mode before it is removed, instead it is
+ * removed directly. There is thus asymmetry with the creation where the
+ * &struct pseudo_lock_region is removed here while it was not created in
+ * rdtgroup_pseudo_lock_create().
+ *
+ * Return: void
+ */
+void rdtgroup_pseudo_lock_remove(struct rdtgroup *rdtgrp)
+{
+	struct pseudo_lock_region *plr = rdtgrp->plr;
+
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+		/*
+		 * Default group cannot be a pseudo-locked region so we can
+		 * free closid here.
+		 */
+		closid_free(rdtgrp->closid);
+		goto free;
+	}
+
+	pseudo_lock_cstates_relax(plr);
+	debugfs_remove_recursive(rdtgrp->plr->debugfs_dir);
+	device_destroy(&pseudo_lock_class, MKDEV(pseudo_lock_major, plr->minor));
+	pseudo_lock_minor_release(plr->minor);
+
+free:
+	pseudo_lock_free(rdtgrp);
+}
+
+static int pseudo_lock_dev_open(struct inode *inode, struct file *filp)
+{
+	struct rdtgroup *rdtgrp;
+
+	mutex_lock(&rdtgroup_mutex);
+
+	rdtgrp = region_find_by_minor(iminor(inode));
+	if (!rdtgrp) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -ENODEV;
+	}
+
+	filp->private_data = rdtgrp;
+	atomic_inc(&rdtgrp->waitcount);
+	/* Perform a non-seekable open - llseek is not supported */
+	filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
+
+	mutex_unlock(&rdtgroup_mutex);
+
+	return 0;
+}
+
+static int pseudo_lock_dev_release(struct inode *inode, struct file *filp)
+{
+	struct rdtgroup *rdtgrp;
+
+	mutex_lock(&rdtgroup_mutex);
+	rdtgrp = filp->private_data;
+	WARN_ON(!rdtgrp);
+	if (!rdtgrp) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -ENODEV;
+	}
+	filp->private_data = NULL;
+	atomic_dec(&rdtgrp->waitcount);
+	mutex_unlock(&rdtgroup_mutex);
+	return 0;
+}
+
+static int pseudo_lock_dev_mremap(struct vm_area_struct *area)
+{
+	/* Not supported */
+	return -EINVAL;
+}
+
+static const struct vm_operations_struct pseudo_mmap_ops = {
+	.mremap = pseudo_lock_dev_mremap,
+};
+
+static int pseudo_lock_dev_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	unsigned long vsize = vma->vm_end - vma->vm_start;
+	unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
+	struct pseudo_lock_region *plr;
+	struct rdtgroup *rdtgrp;
+	unsigned long physical;
+	unsigned long psize;
+
+	mutex_lock(&rdtgroup_mutex);
+
+	rdtgrp = filp->private_data;
+	WARN_ON(!rdtgrp);
+	if (!rdtgrp) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -ENODEV;
+	}
+
+	plr = rdtgrp->plr;
+
+	if (!plr->d) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -ENODEV;
+	}
+
+	/*
+	 * Task is required to run with affinity to the cpus associated
+	 * with the pseudo-locked region. If this is not the case the task
+	 * may be scheduled elsewhere and invalidate entries in the
+	 * pseudo-locked region.
+	 */
+	if (!cpumask_subset(current->cpus_ptr, &plr->d->hdr.cpu_mask)) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -EINVAL;
+	}
+
+	physical = __pa(plr->kmem) >> PAGE_SHIFT;
+	psize = plr->size - off;
+
+	if (off > plr->size) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -ENOSPC;
+	}
+
+	/*
+	 * Ensure changes are carried directly to the memory being mapped,
+	 * do not allow copy-on-write mapping.
+	 */
+	if (!(vma->vm_flags & VM_SHARED)) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -EINVAL;
+	}
+
+	if (vsize > psize) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -ENOSPC;
+	}
+
+	memset(plr->kmem + off, 0, vsize);
+
+	if (remap_pfn_range(vma, vma->vm_start, physical + vma->vm_pgoff,
+			    vsize, vma->vm_page_prot)) {
+		mutex_unlock(&rdtgroup_mutex);
+		return -EAGAIN;
+	}
+	vma->vm_ops = &pseudo_mmap_ops;
+	mutex_unlock(&rdtgroup_mutex);
+	return 0;
+}
+
+static const struct file_operations pseudo_lock_dev_fops = {
+	.owner =	THIS_MODULE,
+	.llseek =	no_llseek,
+	.read =		NULL,
+	.write =	NULL,
+	.open =		pseudo_lock_dev_open,
+	.release =	pseudo_lock_dev_release,
+	.mmap =		pseudo_lock_dev_mmap,
+};
+
+int rdt_pseudo_lock_init(void)
+{
+	int ret;
+
+	ret = register_chrdev(0, "pseudo_lock", &pseudo_lock_dev_fops);
+	if (ret < 0)
+		return ret;
+
+	pseudo_lock_major = ret;
+
+	ret = class_register(&pseudo_lock_class);
+	if (ret) {
+		unregister_chrdev(pseudo_lock_major, "pseudo_lock");
+		return ret;
+	}
+
+	return 0;
+}
+
+void rdt_pseudo_lock_release(void)
+{
+	class_unregister(&pseudo_lock_class);
+	unregister_chrdev(pseudo_lock_major, "pseudo_lock");
+	pseudo_lock_major = 0;
+}
diff --git a/fs/resctrl/pseudo_lock_trace.h b/fs/resctrl/pseudo_lock_trace.h
deleted file mode 100644
index e69de29bb2d1..000000000000
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index e69de29bb2d1..cc37f58b47dd 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -0,0 +1,4353 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * User interface for Resource Allocation in Resource Director Technology(RDT)
+ *
+ * Copyright (C) 2016 Intel Corporation
+ *
+ * Author: Fenghua Yu <fenghua.yu@intel.com>
+ *
+ * More information about RDT be found in the Intel (R) x86 Architecture
+ * Software Developer Manual.
+ */
+
+#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
+
+#include <linux/cpu.h>
+#include <linux/debugfs.h>
+#include <linux/fs.h>
+#include <linux/fs_parser.h>
+#include <linux/sysfs.h>
+#include <linux/kernfs.h>
+#include <linux/resctrl.h>
+#include <linux/seq_buf.h>
+#include <linux/seq_file.h>
+#include <linux/sched/task.h>
+#include <linux/slab.h>
+#include <linux/user_namespace.h>
+
+#include <uapi/linux/magic.h>
+
+#include "internal.h"
+
+/* Mutex to protect rdtgroup access. */
+DEFINE_MUTEX(rdtgroup_mutex);
+
+static struct kernfs_root *rdt_root;
+
+struct rdtgroup rdtgroup_default;
+
+LIST_HEAD(rdt_all_groups);
+
+/* list of entries for the schemata file */
+LIST_HEAD(resctrl_schema_all);
+
+/*
+ * List of struct mon_data containing private data of event files for use by
+ * rdtgroup_mondata_show(). Protected by rdtgroup_mutex.
+ */
+static LIST_HEAD(mon_data_kn_priv_list);
+
+/* The filesystem can only be mounted once. */
+bool resctrl_mounted;
+
+/* Kernel fs node for "info" directory under root */
+static struct kernfs_node *kn_info;
+
+/* Kernel fs node for "mon_groups" directory under root */
+static struct kernfs_node *kn_mongrp;
+
+/* Kernel fs node for "mon_data" directory under root */
+static struct kernfs_node *kn_mondata;
+
+/*
+ * Used to store the max resource name width to display the schemata names in
+ * a tabular format.
+ */
+int max_name_width;
+
+static struct seq_buf last_cmd_status;
+
+static char last_cmd_status_buf[512];
+
+static int rdtgroup_setup_root(struct rdt_fs_context *ctx);
+
+static void rdtgroup_destroy_root(void);
+
+struct dentry *debugfs_resctrl;
+
+/*
+ * Memory bandwidth monitoring event to use for the default CTRL_MON group
+ * and each new CTRL_MON group created by the user.  Only relevant when
+ * the filesystem is mounted with the "mba_MBps" option so it does not
+ * matter that it remains uninitialized on systems that do not support
+ * the "mba_MBps" option.
+ */
+enum resctrl_event_id mba_mbps_default_event;
+
+static bool resctrl_debug;
+
+void rdt_last_cmd_clear(void)
+{
+	lockdep_assert_held(&rdtgroup_mutex);
+	seq_buf_clear(&last_cmd_status);
+}
+
+void rdt_last_cmd_puts(const char *s)
+{
+	lockdep_assert_held(&rdtgroup_mutex);
+	seq_buf_puts(&last_cmd_status, s);
+}
+
+void rdt_last_cmd_printf(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	lockdep_assert_held(&rdtgroup_mutex);
+	seq_buf_vprintf(&last_cmd_status, fmt, ap);
+	va_end(ap);
+}
+
+void rdt_staged_configs_clear(void)
+{
+	struct rdt_ctrl_domain *dom;
+	struct rdt_resource *r;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	for_each_alloc_capable_rdt_resource(r) {
+		list_for_each_entry(dom, &r->ctrl_domains, hdr.list)
+			memset(dom->staged_config, 0, sizeof(dom->staged_config));
+	}
+}
+
+static bool resctrl_is_mbm_enabled(void)
+{
+	return (resctrl_arch_is_mbm_total_enabled() ||
+		resctrl_arch_is_mbm_local_enabled());
+}
+
+static bool resctrl_is_mbm_event(int e)
+{
+	return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
+		e <= QOS_L3_MBM_LOCAL_EVENT_ID);
+}
+
+/*
+ * Trivial allocator for CLOSIDs. Use BITMAP APIs to manipulate a bitmap
+ * of free CLOSIDs.
+ *
+ * Using a global CLOSID across all resources has some advantages and
+ * some drawbacks:
+ * + We can simply set current's closid to assign a task to a resource
+ *   group.
+ * + Context switch code can avoid extra memory references deciding which
+ *   CLOSID to load into the PQR_ASSOC MSR
+ * - We give up some options in configuring resource groups across multi-socket
+ *   systems.
+ * - Our choices on how to configure each resource become progressively more
+ *   limited as the number of resources grows.
+ */
+static unsigned long *closid_free_map;
+
+static int closid_free_map_len;
+
+int closids_supported(void)
+{
+	return closid_free_map_len;
+}
+
+static int closid_init(void)
+{
+	struct resctrl_schema *s;
+	u32 rdt_min_closid = ~0;
+
+	/* Monitor only platforms still call closid_init() */
+	if (list_empty(&resctrl_schema_all))
+		return 0;
+
+	/* Compute rdt_min_closid across all resources */
+	list_for_each_entry(s, &resctrl_schema_all, list)
+		rdt_min_closid = min(rdt_min_closid, s->num_closid);
+
+	closid_free_map = bitmap_alloc(rdt_min_closid, GFP_KERNEL);
+	if (!closid_free_map)
+		return -ENOMEM;
+	bitmap_fill(closid_free_map, rdt_min_closid);
+
+	/* RESCTRL_RESERVED_CLOSID is always reserved for the default group */
+	__clear_bit(RESCTRL_RESERVED_CLOSID, closid_free_map);
+	closid_free_map_len = rdt_min_closid;
+
+	return 0;
+}
+
+static void closid_exit(void)
+{
+	bitmap_free(closid_free_map);
+	closid_free_map = NULL;
+}
+
+static int closid_alloc(void)
+{
+	int cleanest_closid;
+	u32 closid;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID) &&
+	    resctrl_arch_is_llc_occupancy_enabled()) {
+		cleanest_closid = resctrl_find_cleanest_closid();
+		if (cleanest_closid < 0)
+			return cleanest_closid;
+		closid = cleanest_closid;
+	} else {
+		closid = find_first_bit(closid_free_map, closid_free_map_len);
+		if (closid == closid_free_map_len)
+			return -ENOSPC;
+	}
+	__clear_bit(closid, closid_free_map);
+
+	return closid;
+}
+
+void closid_free(int closid)
+{
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	__set_bit(closid, closid_free_map);
+}
+
+/**
+ * closid_allocated - test if provided closid is in use
+ * @closid: closid to be tested
+ *
+ * Return: true if @closid is currently associated with a resource group,
+ * false if @closid is free
+ */
+bool closid_allocated(unsigned int closid)
+{
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	return !test_bit(closid, closid_free_map);
+}
+
+/**
+ * rdtgroup_mode_by_closid - Return mode of resource group with closid
+ * @closid: closid if the resource group
+ *
+ * Each resource group is associated with a @closid. Here the mode
+ * of a resource group can be queried by searching for it using its closid.
+ *
+ * Return: mode as &enum rdtgrp_mode of resource group with closid @closid
+ */
+enum rdtgrp_mode rdtgroup_mode_by_closid(int closid)
+{
+	struct rdtgroup *rdtgrp;
+
+	list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
+		if (rdtgrp->closid == closid)
+			return rdtgrp->mode;
+	}
+
+	return RDT_NUM_MODES;
+}
+
+static const char * const rdt_mode_str[] = {
+	[RDT_MODE_SHAREABLE]		= "shareable",
+	[RDT_MODE_EXCLUSIVE]		= "exclusive",
+	[RDT_MODE_PSEUDO_LOCKSETUP]	= "pseudo-locksetup",
+	[RDT_MODE_PSEUDO_LOCKED]	= "pseudo-locked",
+};
+
+/**
+ * rdtgroup_mode_str - Return the string representation of mode
+ * @mode: the resource group mode as &enum rdtgroup_mode
+ *
+ * Return: string representation of valid mode, "unknown" otherwise
+ */
+static const char *rdtgroup_mode_str(enum rdtgrp_mode mode)
+{
+	if (mode < RDT_MODE_SHAREABLE || mode >= RDT_NUM_MODES)
+		return "unknown";
+
+	return rdt_mode_str[mode];
+}
+
+/* set uid and gid of rdtgroup dirs and files to that of the creator */
+static int rdtgroup_kn_set_ugid(struct kernfs_node *kn)
+{
+	struct iattr iattr = { .ia_valid = ATTR_UID | ATTR_GID,
+				.ia_uid = current_fsuid(),
+				.ia_gid = current_fsgid(), };
+
+	if (uid_eq(iattr.ia_uid, GLOBAL_ROOT_UID) &&
+	    gid_eq(iattr.ia_gid, GLOBAL_ROOT_GID))
+		return 0;
+
+	return kernfs_setattr(kn, &iattr);
+}
+
+static int rdtgroup_add_file(struct kernfs_node *parent_kn, struct rftype *rft)
+{
+	struct kernfs_node *kn;
+	int ret;
+
+	kn = __kernfs_create_file(parent_kn, rft->name, rft->mode,
+				  GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
+				  0, rft->kf_ops, rft, NULL, NULL);
+	if (IS_ERR(kn))
+		return PTR_ERR(kn);
+
+	ret = rdtgroup_kn_set_ugid(kn);
+	if (ret) {
+		kernfs_remove(kn);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int rdtgroup_seqfile_show(struct seq_file *m, void *arg)
+{
+	struct kernfs_open_file *of = m->private;
+	struct rftype *rft = of->kn->priv;
+
+	if (rft->seq_show)
+		return rft->seq_show(of, m, arg);
+	return 0;
+}
+
+static ssize_t rdtgroup_file_write(struct kernfs_open_file *of, char *buf,
+				   size_t nbytes, loff_t off)
+{
+	struct rftype *rft = of->kn->priv;
+
+	if (rft->write)
+		return rft->write(of, buf, nbytes, off);
+
+	return -EINVAL;
+}
+
+static const struct kernfs_ops rdtgroup_kf_single_ops = {
+	.atomic_write_len	= PAGE_SIZE,
+	.write			= rdtgroup_file_write,
+	.seq_show		= rdtgroup_seqfile_show,
+};
+
+static const struct kernfs_ops kf_mondata_ops = {
+	.atomic_write_len	= PAGE_SIZE,
+	.seq_show		= rdtgroup_mondata_show,
+};
+
+static bool is_cpu_list(struct kernfs_open_file *of)
+{
+	struct rftype *rft = of->kn->priv;
+
+	return rft->flags & RFTYPE_FLAGS_CPUS_LIST;
+}
+
+static int rdtgroup_cpus_show(struct kernfs_open_file *of,
+			      struct seq_file *s, void *v)
+{
+	struct rdtgroup *rdtgrp;
+	struct cpumask *mask;
+	int ret = 0;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+
+	if (rdtgrp) {
+		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+			if (!rdtgrp->plr->d) {
+				rdt_last_cmd_clear();
+				rdt_last_cmd_puts("Cache domain offline\n");
+				ret = -ENODEV;
+			} else {
+				mask = &rdtgrp->plr->d->hdr.cpu_mask;
+				seq_printf(s, is_cpu_list(of) ?
+					   "%*pbl\n" : "%*pb\n",
+					   cpumask_pr_args(mask));
+			}
+		} else {
+			seq_printf(s, is_cpu_list(of) ? "%*pbl\n" : "%*pb\n",
+				   cpumask_pr_args(&rdtgrp->cpu_mask));
+		}
+	} else {
+		ret = -ENOENT;
+	}
+	rdtgroup_kn_unlock(of->kn);
+
+	return ret;
+}
+
+/*
+ * Update the PGR_ASSOC MSR on all cpus in @cpu_mask,
+ *
+ * Per task closids/rmids must have been set up before calling this function.
+ * @r may be NULL.
+ */
+static void
+update_closid_rmid(const struct cpumask *cpu_mask, struct rdtgroup *r)
+{
+	struct resctrl_cpu_defaults defaults, *p = NULL;
+
+	if (r) {
+		defaults.closid = r->closid;
+		defaults.rmid = r->mon.rmid;
+		p = &defaults;
+	}
+
+	on_each_cpu_mask(cpu_mask, resctrl_arch_sync_cpu_closid_rmid, p, 1);
+}
+
+static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
+			  cpumask_var_t tmpmask)
+{
+	struct rdtgroup *prgrp = rdtgrp->mon.parent, *crgrp;
+	struct list_head *head;
+
+	/* Check whether cpus belong to parent ctrl group */
+	cpumask_andnot(tmpmask, newmask, &prgrp->cpu_mask);
+	if (!cpumask_empty(tmpmask)) {
+		rdt_last_cmd_puts("Can only add CPUs to mongroup that belong to parent\n");
+		return -EINVAL;
+	}
+
+	/* Check whether cpus are dropped from this group */
+	cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
+	if (!cpumask_empty(tmpmask)) {
+		/* Give any dropped cpus to parent rdtgroup */
+		cpumask_or(&prgrp->cpu_mask, &prgrp->cpu_mask, tmpmask);
+		update_closid_rmid(tmpmask, prgrp);
+	}
+
+	/*
+	 * If we added cpus, remove them from previous group that owned them
+	 * and update per-cpu rmid
+	 */
+	cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask);
+	if (!cpumask_empty(tmpmask)) {
+		head = &prgrp->mon.crdtgrp_list;
+		list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
+			if (crgrp == rdtgrp)
+				continue;
+			cpumask_andnot(&crgrp->cpu_mask, &crgrp->cpu_mask,
+				       tmpmask);
+		}
+		update_closid_rmid(tmpmask, rdtgrp);
+	}
+
+	/* Done pushing/pulling - update this group with new mask */
+	cpumask_copy(&rdtgrp->cpu_mask, newmask);
+
+	return 0;
+}
+
+static void cpumask_rdtgrp_clear(struct rdtgroup *r, struct cpumask *m)
+{
+	struct rdtgroup *crgrp;
+
+	cpumask_andnot(&r->cpu_mask, &r->cpu_mask, m);
+	/* update the child mon group masks as well*/
+	list_for_each_entry(crgrp, &r->mon.crdtgrp_list, mon.crdtgrp_list)
+		cpumask_and(&crgrp->cpu_mask, &r->cpu_mask, &crgrp->cpu_mask);
+}
+
+static int cpus_ctrl_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
+			   cpumask_var_t tmpmask, cpumask_var_t tmpmask1)
+{
+	struct rdtgroup *r, *crgrp;
+	struct list_head *head;
+
+	/* Check whether cpus are dropped from this group */
+	cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);
+	if (!cpumask_empty(tmpmask)) {
+		/* Can't drop from default group */
+		if (rdtgrp == &rdtgroup_default) {
+			rdt_last_cmd_puts("Can't drop CPUs from default group\n");
+			return -EINVAL;
+		}
+
+		/* Give any dropped cpus to rdtgroup_default */
+		cpumask_or(&rdtgroup_default.cpu_mask,
+			   &rdtgroup_default.cpu_mask, tmpmask);
+		update_closid_rmid(tmpmask, &rdtgroup_default);
+	}
+
+	/*
+	 * If we added cpus, remove them from previous group and
+	 * the prev group's child groups that owned them
+	 * and update per-cpu closid/rmid.
+	 */
+	cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask);
+	if (!cpumask_empty(tmpmask)) {
+		list_for_each_entry(r, &rdt_all_groups, rdtgroup_list) {
+			if (r == rdtgrp)
+				continue;
+			cpumask_and(tmpmask1, &r->cpu_mask, tmpmask);
+			if (!cpumask_empty(tmpmask1))
+				cpumask_rdtgrp_clear(r, tmpmask1);
+		}
+		update_closid_rmid(tmpmask, rdtgrp);
+	}
+
+	/* Done pushing/pulling - update this group with new mask */
+	cpumask_copy(&rdtgrp->cpu_mask, newmask);
+
+	/*
+	 * Clear child mon group masks since there is a new parent mask
+	 * now and update the rmid for the cpus the child lost.
+	 */
+	head = &rdtgrp->mon.crdtgrp_list;
+	list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
+		cpumask_and(tmpmask, &rdtgrp->cpu_mask, &crgrp->cpu_mask);
+		update_closid_rmid(tmpmask, rdtgrp);
+		cpumask_clear(&crgrp->cpu_mask);
+	}
+
+	return 0;
+}
+
+static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of,
+				   char *buf, size_t nbytes, loff_t off)
+{
+	cpumask_var_t tmpmask, newmask, tmpmask1;
+	struct rdtgroup *rdtgrp;
+	int ret;
+
+	if (!buf)
+		return -EINVAL;
+
+	if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL))
+		return -ENOMEM;
+	if (!zalloc_cpumask_var(&newmask, GFP_KERNEL)) {
+		free_cpumask_var(tmpmask);
+		return -ENOMEM;
+	}
+	if (!zalloc_cpumask_var(&tmpmask1, GFP_KERNEL)) {
+		free_cpumask_var(tmpmask);
+		free_cpumask_var(newmask);
+		return -ENOMEM;
+	}
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		ret = -ENOENT;
+		goto unlock;
+	}
+
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED ||
+	    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+		ret = -EINVAL;
+		rdt_last_cmd_puts("Pseudo-locking in progress\n");
+		goto unlock;
+	}
+
+	if (is_cpu_list(of))
+		ret = cpulist_parse(buf, newmask);
+	else
+		ret = cpumask_parse(buf, newmask);
+
+	if (ret) {
+		rdt_last_cmd_puts("Bad CPU list/mask\n");
+		goto unlock;
+	}
+
+	/* check that user didn't specify any offline cpus */
+	cpumask_andnot(tmpmask, newmask, cpu_online_mask);
+	if (!cpumask_empty(tmpmask)) {
+		ret = -EINVAL;
+		rdt_last_cmd_puts("Can only assign online CPUs\n");
+		goto unlock;
+	}
+
+	if (rdtgrp->type == RDTCTRL_GROUP)
+		ret = cpus_ctrl_write(rdtgrp, newmask, tmpmask, tmpmask1);
+	else if (rdtgrp->type == RDTMON_GROUP)
+		ret = cpus_mon_write(rdtgrp, newmask, tmpmask);
+	else
+		ret = -EINVAL;
+
+unlock:
+	rdtgroup_kn_unlock(of->kn);
+	free_cpumask_var(tmpmask);
+	free_cpumask_var(newmask);
+	free_cpumask_var(tmpmask1);
+
+	return ret ?: nbytes;
+}
+
+/**
+ * rdtgroup_remove - the helper to remove resource group safely
+ * @rdtgrp: resource group to remove
+ *
+ * On resource group creation via a mkdir, an extra kernfs_node reference is
+ * taken to ensure that the rdtgroup structure remains accessible for the
+ * rdtgroup_kn_unlock() calls where it is removed.
+ *
+ * Drop the extra reference here, then free the rdtgroup structure.
+ *
+ * Return: void
+ */
+static void rdtgroup_remove(struct rdtgroup *rdtgrp)
+{
+	kernfs_put(rdtgrp->kn);
+	kfree(rdtgrp);
+}
+
+static void _update_task_closid_rmid(void *task)
+{
+	/*
+	 * If the task is still current on this CPU, update PQR_ASSOC MSR.
+	 * Otherwise, the MSR is updated when the task is scheduled in.
+	 */
+	if (task == current)
+		resctrl_arch_sched_in(task);
+}
+
+static void update_task_closid_rmid(struct task_struct *t)
+{
+	if (IS_ENABLED(CONFIG_SMP) && task_curr(t))
+		smp_call_function_single(task_cpu(t), _update_task_closid_rmid, t, 1);
+	else
+		_update_task_closid_rmid(t);
+}
+
+static bool task_in_rdtgroup(struct task_struct *tsk, struct rdtgroup *rdtgrp)
+{
+	u32 closid, rmid = rdtgrp->mon.rmid;
+
+	if (rdtgrp->type == RDTCTRL_GROUP)
+		closid = rdtgrp->closid;
+	else if (rdtgrp->type == RDTMON_GROUP)
+		closid = rdtgrp->mon.parent->closid;
+	else
+		return false;
+
+	return resctrl_arch_match_closid(tsk, closid) &&
+	       resctrl_arch_match_rmid(tsk, closid, rmid);
+}
+
+static int __rdtgroup_move_task(struct task_struct *tsk,
+				struct rdtgroup *rdtgrp)
+{
+	/* If the task is already in rdtgrp, no need to move the task. */
+	if (task_in_rdtgroup(tsk, rdtgrp))
+		return 0;
+
+	/*
+	 * Set the task's closid/rmid before the PQR_ASSOC MSR can be
+	 * updated by them.
+	 *
+	 * For ctrl_mon groups, move both closid and rmid.
+	 * For monitor groups, can move the tasks only from
+	 * their parent CTRL group.
+	 */
+	if (rdtgrp->type == RDTMON_GROUP &&
+	    !resctrl_arch_match_closid(tsk, rdtgrp->mon.parent->closid)) {
+		rdt_last_cmd_puts("Can't move task to different control group\n");
+		return -EINVAL;
+	}
+
+	if (rdtgrp->type == RDTMON_GROUP)
+		resctrl_arch_set_closid_rmid(tsk, rdtgrp->mon.parent->closid,
+					     rdtgrp->mon.rmid);
+	else
+		resctrl_arch_set_closid_rmid(tsk, rdtgrp->closid,
+					     rdtgrp->mon.rmid);
+
+	/*
+	 * Ensure the task's closid and rmid are written before determining if
+	 * the task is current that will decide if it will be interrupted.
+	 * This pairs with the full barrier between the rq->curr update and
+	 * resctrl_arch_sched_in() during context switch.
+	 */
+	smp_mb();
+
+	/*
+	 * By now, the task's closid and rmid are set. If the task is current
+	 * on a CPU, the PQR_ASSOC MSR needs to be updated to make the resource
+	 * group go into effect. If the task is not current, the MSR will be
+	 * updated when the task is scheduled in.
+	 */
+	update_task_closid_rmid(tsk);
+
+	return 0;
+}
+
+static bool is_closid_match(struct task_struct *t, struct rdtgroup *r)
+{
+	return (resctrl_arch_alloc_capable() && (r->type == RDTCTRL_GROUP) &&
+		resctrl_arch_match_closid(t, r->closid));
+}
+
+static bool is_rmid_match(struct task_struct *t, struct rdtgroup *r)
+{
+	return (resctrl_arch_mon_capable() && (r->type == RDTMON_GROUP) &&
+		resctrl_arch_match_rmid(t, r->mon.parent->closid,
+					r->mon.rmid));
+}
+
+/**
+ * rdtgroup_tasks_assigned - Test if tasks have been assigned to resource group
+ * @r: Resource group
+ *
+ * Return: 1 if tasks have been assigned to @r, 0 otherwise
+ */
+int rdtgroup_tasks_assigned(struct rdtgroup *r)
+{
+	struct task_struct *p, *t;
+	int ret = 0;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	rcu_read_lock();
+	for_each_process_thread(p, t) {
+		if (is_closid_match(t, r) || is_rmid_match(t, r)) {
+			ret = 1;
+			break;
+		}
+	}
+	rcu_read_unlock();
+
+	return ret;
+}
+
+static int rdtgroup_task_write_permission(struct task_struct *task,
+					  struct kernfs_open_file *of)
+{
+	const struct cred *tcred = get_task_cred(task);
+	const struct cred *cred = current_cred();
+	int ret = 0;
+
+	/*
+	 * Even if we're attaching all tasks in the thread group, we only
+	 * need to check permissions on one of them.
+	 */
+	if (!uid_eq(cred->euid, GLOBAL_ROOT_UID) &&
+	    !uid_eq(cred->euid, tcred->uid) &&
+	    !uid_eq(cred->euid, tcred->suid)) {
+		rdt_last_cmd_printf("No permission to move task %d\n", task->pid);
+		ret = -EPERM;
+	}
+
+	put_cred(tcred);
+	return ret;
+}
+
+static int rdtgroup_move_task(pid_t pid, struct rdtgroup *rdtgrp,
+			      struct kernfs_open_file *of)
+{
+	struct task_struct *tsk;
+	int ret;
+
+	rcu_read_lock();
+	if (pid) {
+		tsk = find_task_by_vpid(pid);
+		if (!tsk) {
+			rcu_read_unlock();
+			rdt_last_cmd_printf("No task %d\n", pid);
+			return -ESRCH;
+		}
+	} else {
+		tsk = current;
+	}
+
+	get_task_struct(tsk);
+	rcu_read_unlock();
+
+	ret = rdtgroup_task_write_permission(tsk, of);
+	if (!ret)
+		ret = __rdtgroup_move_task(tsk, rdtgrp);
+
+	put_task_struct(tsk);
+	return ret;
+}
+
+static ssize_t rdtgroup_tasks_write(struct kernfs_open_file *of,
+				    char *buf, size_t nbytes, loff_t off)
+{
+	struct rdtgroup *rdtgrp;
+	char *pid_str;
+	int ret = 0;
+	pid_t pid;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		rdtgroup_kn_unlock(of->kn);
+		return -ENOENT;
+	}
+	rdt_last_cmd_clear();
+
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED ||
+	    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+		ret = -EINVAL;
+		rdt_last_cmd_puts("Pseudo-locking in progress\n");
+		goto unlock;
+	}
+
+	while (buf && buf[0] != '\0' && buf[0] != '\n') {
+		pid_str = strim(strsep(&buf, ","));
+
+		if (kstrtoint(pid_str, 0, &pid)) {
+			rdt_last_cmd_printf("Task list parsing error pid %s\n", pid_str);
+			ret = -EINVAL;
+			break;
+		}
+
+		if (pid < 0) {
+			rdt_last_cmd_printf("Invalid pid %d\n", pid);
+			ret = -EINVAL;
+			break;
+		}
+
+		ret = rdtgroup_move_task(pid, rdtgrp, of);
+		if (ret) {
+			rdt_last_cmd_printf("Error while processing task %d\n", pid);
+			break;
+		}
+	}
+
+unlock:
+	rdtgroup_kn_unlock(of->kn);
+
+	return ret ?: nbytes;
+}
+
+static void show_rdt_tasks(struct rdtgroup *r, struct seq_file *s)
+{
+	struct task_struct *p, *t;
+	pid_t pid;
+
+	rcu_read_lock();
+	for_each_process_thread(p, t) {
+		if (is_closid_match(t, r) || is_rmid_match(t, r)) {
+			pid = task_pid_vnr(t);
+			if (pid)
+				seq_printf(s, "%d\n", pid);
+		}
+	}
+	rcu_read_unlock();
+}
+
+static int rdtgroup_tasks_show(struct kernfs_open_file *of,
+			       struct seq_file *s, void *v)
+{
+	struct rdtgroup *rdtgrp;
+	int ret = 0;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (rdtgrp)
+		show_rdt_tasks(rdtgrp, s);
+	else
+		ret = -ENOENT;
+	rdtgroup_kn_unlock(of->kn);
+
+	return ret;
+}
+
+static int rdtgroup_closid_show(struct kernfs_open_file *of,
+				struct seq_file *s, void *v)
+{
+	struct rdtgroup *rdtgrp;
+	int ret = 0;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (rdtgrp)
+		seq_printf(s, "%u\n", rdtgrp->closid);
+	else
+		ret = -ENOENT;
+	rdtgroup_kn_unlock(of->kn);
+
+	return ret;
+}
+
+static int rdtgroup_rmid_show(struct kernfs_open_file *of,
+			      struct seq_file *s, void *v)
+{
+	struct rdtgroup *rdtgrp;
+	int ret = 0;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (rdtgrp)
+		seq_printf(s, "%u\n", rdtgrp->mon.rmid);
+	else
+		ret = -ENOENT;
+	rdtgroup_kn_unlock(of->kn);
+
+	return ret;
+}
+
+#ifdef CONFIG_PROC_CPU_RESCTRL
+/*
+ * A task can only be part of one resctrl control group and of one monitor
+ * group which is associated to that control group.
+ *
+ * 1)   res:
+ *      mon:
+ *
+ *    resctrl is not available.
+ *
+ * 2)   res:/
+ *      mon:
+ *
+ *    Task is part of the root resctrl control group, and it is not associated
+ *    to any monitor group.
+ *
+ * 3)  res:/
+ *     mon:mon0
+ *
+ *    Task is part of the root resctrl control group and monitor group mon0.
+ *
+ * 4)  res:group0
+ *     mon:
+ *
+ *    Task is part of resctrl control group group0, and it is not associated
+ *    to any monitor group.
+ *
+ * 5) res:group0
+ *    mon:mon1
+ *
+ *    Task is part of resctrl control group group0 and monitor group mon1.
+ */
+int proc_resctrl_show(struct seq_file *s, struct pid_namespace *ns,
+		      struct pid *pid, struct task_struct *tsk)
+{
+	struct rdtgroup *rdtg;
+	int ret = 0;
+
+	mutex_lock(&rdtgroup_mutex);
+
+	/* Return empty if resctrl has not been mounted. */
+	if (!resctrl_mounted) {
+		seq_puts(s, "res:\nmon:\n");
+		goto unlock;
+	}
+
+	list_for_each_entry(rdtg, &rdt_all_groups, rdtgroup_list) {
+		struct rdtgroup *crg;
+
+		/*
+		 * Task information is only relevant for shareable
+		 * and exclusive groups.
+		 */
+		if (rdtg->mode != RDT_MODE_SHAREABLE &&
+		    rdtg->mode != RDT_MODE_EXCLUSIVE)
+			continue;
+
+		if (!resctrl_arch_match_closid(tsk, rdtg->closid))
+			continue;
+
+		seq_printf(s, "res:%s%s\n", (rdtg == &rdtgroup_default) ? "/" : "",
+			   rdt_kn_name(rdtg->kn));
+		seq_puts(s, "mon:");
+		list_for_each_entry(crg, &rdtg->mon.crdtgrp_list,
+				    mon.crdtgrp_list) {
+			if (!resctrl_arch_match_rmid(tsk, crg->mon.parent->closid,
+						     crg->mon.rmid))
+				continue;
+			seq_printf(s, "%s", rdt_kn_name(crg->kn));
+			break;
+		}
+		seq_putc(s, '\n');
+		goto unlock;
+	}
+	/*
+	 * The above search should succeed. Otherwise return
+	 * with an error.
+	 */
+	ret = -ENOENT;
+unlock:
+	mutex_unlock(&rdtgroup_mutex);
+
+	return ret;
+}
+#endif
+
+static int rdt_last_cmd_status_show(struct kernfs_open_file *of,
+				    struct seq_file *seq, void *v)
+{
+	int len;
+
+	mutex_lock(&rdtgroup_mutex);
+	len = seq_buf_used(&last_cmd_status);
+	if (len)
+		seq_printf(seq, "%.*s", len, last_cmd_status_buf);
+	else
+		seq_puts(seq, "ok\n");
+	mutex_unlock(&rdtgroup_mutex);
+	return 0;
+}
+
+static void *rdt_kn_parent_priv(struct kernfs_node *kn)
+{
+	/*
+	 * The parent pointer is only valid within RCU section since it can be
+	 * replaced.
+	 */
+	guard(rcu)();
+	return rcu_dereference(kn->__parent)->priv;
+}
+
+static int rdt_num_closids_show(struct kernfs_open_file *of,
+				struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
+
+	seq_printf(seq, "%u\n", s->num_closid);
+	return 0;
+}
+
+static int rdt_default_ctrl_show(struct kernfs_open_file *of,
+				 struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
+	struct rdt_resource *r = s->res;
+
+	seq_printf(seq, "%x\n", resctrl_get_default_ctrl(r));
+	return 0;
+}
+
+static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
+				 struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
+	struct rdt_resource *r = s->res;
+
+	seq_printf(seq, "%u\n", r->cache.min_cbm_bits);
+	return 0;
+}
+
+static int rdt_shareable_bits_show(struct kernfs_open_file *of,
+				   struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
+	struct rdt_resource *r = s->res;
+
+	seq_printf(seq, "%x\n", r->cache.shareable_bits);
+	return 0;
+}
+
+/*
+ * rdt_bit_usage_show - Display current usage of resources
+ *
+ * A domain is a shared resource that can now be allocated differently. Here
+ * we display the current regions of the domain as an annotated bitmask.
+ * For each domain of this resource its allocation bitmask
+ * is annotated as below to indicate the current usage of the corresponding bit:
+ *   0 - currently unused
+ *   X - currently available for sharing and used by software and hardware
+ *   H - currently used by hardware only but available for software use
+ *   S - currently used and shareable by software only
+ *   E - currently used exclusively by one resource group
+ *   P - currently pseudo-locked by one resource group
+ */
+static int rdt_bit_usage_show(struct kernfs_open_file *of,
+			      struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
+	/*
+	 * Use unsigned long even though only 32 bits are used to ensure
+	 * test_bit() is used safely.
+	 */
+	unsigned long sw_shareable = 0, hw_shareable = 0;
+	unsigned long exclusive = 0, pseudo_locked = 0;
+	struct rdt_resource *r = s->res;
+	struct rdt_ctrl_domain *dom;
+	int i, hwb, swb, excl, psl;
+	enum rdtgrp_mode mode;
+	bool sep = false;
+	u32 ctrl_val;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+	hw_shareable = r->cache.shareable_bits;
+	list_for_each_entry(dom, &r->ctrl_domains, hdr.list) {
+		if (sep)
+			seq_putc(seq, ';');
+		sw_shareable = 0;
+		exclusive = 0;
+		seq_printf(seq, "%d=", dom->hdr.id);
+		for (i = 0; i < closids_supported(); i++) {
+			if (!closid_allocated(i))
+				continue;
+			ctrl_val = resctrl_arch_get_config(r, dom, i,
+							   s->conf_type);
+			mode = rdtgroup_mode_by_closid(i);
+			switch (mode) {
+			case RDT_MODE_SHAREABLE:
+				sw_shareable |= ctrl_val;
+				break;
+			case RDT_MODE_EXCLUSIVE:
+				exclusive |= ctrl_val;
+				break;
+			case RDT_MODE_PSEUDO_LOCKSETUP:
+			/*
+			 * RDT_MODE_PSEUDO_LOCKSETUP is possible
+			 * here but not included since the CBM
+			 * associated with this CLOSID in this mode
+			 * is not initialized and no task or cpu can be
+			 * assigned this CLOSID.
+			 */
+				break;
+			case RDT_MODE_PSEUDO_LOCKED:
+			case RDT_NUM_MODES:
+				WARN(1,
+				     "invalid mode for closid %d\n", i);
+				break;
+			}
+		}
+		for (i = r->cache.cbm_len - 1; i >= 0; i--) {
+			pseudo_locked = dom->plr ? dom->plr->cbm : 0;
+			hwb = test_bit(i, &hw_shareable);
+			swb = test_bit(i, &sw_shareable);
+			excl = test_bit(i, &exclusive);
+			psl = test_bit(i, &pseudo_locked);
+			if (hwb && swb)
+				seq_putc(seq, 'X');
+			else if (hwb && !swb)
+				seq_putc(seq, 'H');
+			else if (!hwb && swb)
+				seq_putc(seq, 'S');
+			else if (excl)
+				seq_putc(seq, 'E');
+			else if (psl)
+				seq_putc(seq, 'P');
+			else /* Unused bits remain */
+				seq_putc(seq, '0');
+		}
+		sep = true;
+	}
+	seq_putc(seq, '\n');
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+	return 0;
+}
+
+static int rdt_min_bw_show(struct kernfs_open_file *of,
+			   struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
+	struct rdt_resource *r = s->res;
+
+	seq_printf(seq, "%u\n", r->membw.min_bw);
+	return 0;
+}
+
+static int rdt_num_rmids_show(struct kernfs_open_file *of,
+			      struct seq_file *seq, void *v)
+{
+	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
+
+	seq_printf(seq, "%d\n", r->num_rmid);
+
+	return 0;
+}
+
+static int rdt_mon_features_show(struct kernfs_open_file *of,
+				 struct seq_file *seq, void *v)
+{
+	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
+	struct mon_evt *mevt;
+
+	list_for_each_entry(mevt, &r->evt_list, list) {
+		seq_printf(seq, "%s\n", mevt->name);
+		if (mevt->configurable)
+			seq_printf(seq, "%s_config\n", mevt->name);
+	}
+
+	return 0;
+}
+
+static int rdt_bw_gran_show(struct kernfs_open_file *of,
+			    struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
+	struct rdt_resource *r = s->res;
+
+	seq_printf(seq, "%u\n", r->membw.bw_gran);
+	return 0;
+}
+
+static int rdt_delay_linear_show(struct kernfs_open_file *of,
+				 struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
+	struct rdt_resource *r = s->res;
+
+	seq_printf(seq, "%u\n", r->membw.delay_linear);
+	return 0;
+}
+
+static int max_threshold_occ_show(struct kernfs_open_file *of,
+				  struct seq_file *seq, void *v)
+{
+	seq_printf(seq, "%u\n", resctrl_rmid_realloc_threshold);
+
+	return 0;
+}
+
+static int rdt_thread_throttle_mode_show(struct kernfs_open_file *of,
+					 struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
+	struct rdt_resource *r = s->res;
+
+	switch (r->membw.throttle_mode) {
+	case THREAD_THROTTLE_PER_THREAD:
+		seq_puts(seq, "per-thread\n");
+		return 0;
+	case THREAD_THROTTLE_MAX:
+		seq_puts(seq, "max\n");
+		return 0;
+	case THREAD_THROTTLE_UNDEFINED:
+		seq_puts(seq, "undefined\n");
+		return 0;
+	}
+
+	WARN_ON_ONCE(1);
+
+	return 0;
+}
+
+static ssize_t max_threshold_occ_write(struct kernfs_open_file *of,
+				       char *buf, size_t nbytes, loff_t off)
+{
+	unsigned int bytes;
+	int ret;
+
+	ret = kstrtouint(buf, 0, &bytes);
+	if (ret)
+		return ret;
+
+	if (bytes > resctrl_rmid_realloc_limit)
+		return -EINVAL;
+
+	resctrl_rmid_realloc_threshold = resctrl_arch_round_mon_val(bytes);
+
+	return nbytes;
+}
+
+/*
+ * rdtgroup_mode_show - Display mode of this resource group
+ */
+static int rdtgroup_mode_show(struct kernfs_open_file *of,
+			      struct seq_file *s, void *v)
+{
+	struct rdtgroup *rdtgrp;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		rdtgroup_kn_unlock(of->kn);
+		return -ENOENT;
+	}
+
+	seq_printf(s, "%s\n", rdtgroup_mode_str(rdtgrp->mode));
+
+	rdtgroup_kn_unlock(of->kn);
+	return 0;
+}
+
+static enum resctrl_conf_type resctrl_peer_type(enum resctrl_conf_type my_type)
+{
+	switch (my_type) {
+	case CDP_CODE:
+		return CDP_DATA;
+	case CDP_DATA:
+		return CDP_CODE;
+	default:
+	case CDP_NONE:
+		return CDP_NONE;
+	}
+}
+
+static int rdt_has_sparse_bitmasks_show(struct kernfs_open_file *of,
+					struct seq_file *seq, void *v)
+{
+	struct resctrl_schema *s = rdt_kn_parent_priv(of->kn);
+	struct rdt_resource *r = s->res;
+
+	seq_printf(seq, "%u\n", r->cache.arch_has_sparse_bitmasks);
+
+	return 0;
+}
+
+/**
+ * __rdtgroup_cbm_overlaps - Does CBM for intended closid overlap with other
+ * @r: Resource to which domain instance @d belongs.
+ * @d: The domain instance for which @closid is being tested.
+ * @cbm: Capacity bitmask being tested.
+ * @closid: Intended closid for @cbm.
+ * @type: CDP type of @r.
+ * @exclusive: Only check if overlaps with exclusive resource groups
+ *
+ * Checks if provided @cbm intended to be used for @closid on domain
+ * @d overlaps with any other closids or other hardware usage associated
+ * with this domain. If @exclusive is true then only overlaps with
+ * resource groups in exclusive mode will be considered. If @exclusive
+ * is false then overlaps with any resource group or hardware entities
+ * will be considered.
+ *
+ * @cbm is unsigned long, even if only 32 bits are used, to make the
+ * bitmap functions work correctly.
+ *
+ * Return: false if CBM does not overlap, true if it does.
+ */
+static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_ctrl_domain *d,
+				    unsigned long cbm, int closid,
+				    enum resctrl_conf_type type, bool exclusive)
+{
+	enum rdtgrp_mode mode;
+	unsigned long ctrl_b;
+	int i;
+
+	/* Check for any overlap with regions used by hardware directly */
+	if (!exclusive) {
+		ctrl_b = r->cache.shareable_bits;
+		if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len))
+			return true;
+	}
+
+	/* Check for overlap with other resource groups */
+	for (i = 0; i < closids_supported(); i++) {
+		ctrl_b = resctrl_arch_get_config(r, d, i, type);
+		mode = rdtgroup_mode_by_closid(i);
+		if (closid_allocated(i) && i != closid &&
+		    mode != RDT_MODE_PSEUDO_LOCKSETUP) {
+			if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len)) {
+				if (exclusive) {
+					if (mode == RDT_MODE_EXCLUSIVE)
+						return true;
+					continue;
+				}
+				return true;
+			}
+		}
+	}
+
+	return false;
+}
+
+/**
+ * rdtgroup_cbm_overlaps - Does CBM overlap with other use of hardware
+ * @s: Schema for the resource to which domain instance @d belongs.
+ * @d: The domain instance for which @closid is being tested.
+ * @cbm: Capacity bitmask being tested.
+ * @closid: Intended closid for @cbm.
+ * @exclusive: Only check if overlaps with exclusive resource groups
+ *
+ * Resources that can be allocated using a CBM can use the CBM to control
+ * the overlap of these allocations. rdtgroup_cmb_overlaps() is the test
+ * for overlap. Overlap test is not limited to the specific resource for
+ * which the CBM is intended though - when dealing with CDP resources that
+ * share the underlying hardware the overlap check should be performed on
+ * the CDP resource sharing the hardware also.
+ *
+ * Refer to description of __rdtgroup_cbm_overlaps() for the details of the
+ * overlap test.
+ *
+ * Return: true if CBM overlap detected, false if there is no overlap
+ */
+bool rdtgroup_cbm_overlaps(struct resctrl_schema *s, struct rdt_ctrl_domain *d,
+			   unsigned long cbm, int closid, bool exclusive)
+{
+	enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
+	struct rdt_resource *r = s->res;
+
+	if (__rdtgroup_cbm_overlaps(r, d, cbm, closid, s->conf_type,
+				    exclusive))
+		return true;
+
+	if (!resctrl_arch_get_cdp_enabled(r->rid))
+		return false;
+	return  __rdtgroup_cbm_overlaps(r, d, cbm, closid, peer_type, exclusive);
+}
+
+/**
+ * rdtgroup_mode_test_exclusive - Test if this resource group can be exclusive
+ * @rdtgrp: Resource group identified through its closid.
+ *
+ * An exclusive resource group implies that there should be no sharing of
+ * its allocated resources. At the time this group is considered to be
+ * exclusive this test can determine if its current schemata supports this
+ * setting by testing for overlap with all other resource groups.
+ *
+ * Return: true if resource group can be exclusive, false if there is overlap
+ * with allocations of other resource groups and thus this resource group
+ * cannot be exclusive.
+ */
+static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp)
+{
+	int closid = rdtgrp->closid;
+	struct rdt_ctrl_domain *d;
+	struct resctrl_schema *s;
+	struct rdt_resource *r;
+	bool has_cache = false;
+	u32 ctrl;
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		r = s->res;
+		if (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)
+			continue;
+		has_cache = true;
+		list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
+			ctrl = resctrl_arch_get_config(r, d, closid,
+						       s->conf_type);
+			if (rdtgroup_cbm_overlaps(s, d, ctrl, closid, false)) {
+				rdt_last_cmd_puts("Schemata overlaps\n");
+				return false;
+			}
+		}
+	}
+
+	if (!has_cache) {
+		rdt_last_cmd_puts("Cannot be exclusive without CAT/CDP\n");
+		return false;
+	}
+
+	return true;
+}
+
+/*
+ * rdtgroup_mode_write - Modify the resource group's mode
+ */
+static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of,
+				   char *buf, size_t nbytes, loff_t off)
+{
+	struct rdtgroup *rdtgrp;
+	enum rdtgrp_mode mode;
+	int ret = 0;
+
+	/* Valid input requires a trailing newline */
+	if (nbytes == 0 || buf[nbytes - 1] != '\n')
+		return -EINVAL;
+	buf[nbytes - 1] = '\0';
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		rdtgroup_kn_unlock(of->kn);
+		return -ENOENT;
+	}
+
+	rdt_last_cmd_clear();
+
+	mode = rdtgrp->mode;
+
+	if ((!strcmp(buf, "shareable") && mode == RDT_MODE_SHAREABLE) ||
+	    (!strcmp(buf, "exclusive") && mode == RDT_MODE_EXCLUSIVE) ||
+	    (!strcmp(buf, "pseudo-locksetup") &&
+	     mode == RDT_MODE_PSEUDO_LOCKSETUP) ||
+	    (!strcmp(buf, "pseudo-locked") && mode == RDT_MODE_PSEUDO_LOCKED))
+		goto out;
+
+	if (mode == RDT_MODE_PSEUDO_LOCKED) {
+		rdt_last_cmd_puts("Cannot change pseudo-locked group\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (!strcmp(buf, "shareable")) {
+		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+			ret = rdtgroup_locksetup_exit(rdtgrp);
+			if (ret)
+				goto out;
+		}
+		rdtgrp->mode = RDT_MODE_SHAREABLE;
+	} else if (!strcmp(buf, "exclusive")) {
+		if (!rdtgroup_mode_test_exclusive(rdtgrp)) {
+			ret = -EINVAL;
+			goto out;
+		}
+		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+			ret = rdtgroup_locksetup_exit(rdtgrp);
+			if (ret)
+				goto out;
+		}
+		rdtgrp->mode = RDT_MODE_EXCLUSIVE;
+	} else if (IS_ENABLED(CONFIG_RESCTRL_FS_PSEUDO_LOCK) &&
+		   !strcmp(buf, "pseudo-locksetup")) {
+		ret = rdtgroup_locksetup_enter(rdtgrp);
+		if (ret)
+			goto out;
+		rdtgrp->mode = RDT_MODE_PSEUDO_LOCKSETUP;
+	} else {
+		rdt_last_cmd_puts("Unknown or unsupported mode\n");
+		ret = -EINVAL;
+	}
+
+out:
+	rdtgroup_kn_unlock(of->kn);
+	return ret ?: nbytes;
+}
+
+/**
+ * rdtgroup_cbm_to_size - Translate CBM to size in bytes
+ * @r: RDT resource to which @d belongs.
+ * @d: RDT domain instance.
+ * @cbm: bitmask for which the size should be computed.
+ *
+ * The bitmask provided associated with the RDT domain instance @d will be
+ * translated into how many bytes it represents. The size in bytes is
+ * computed by first dividing the total cache size by the CBM length to
+ * determine how many bytes each bit in the bitmask represents. The result
+ * is multiplied with the number of bits set in the bitmask.
+ *
+ * @cbm is unsigned long, even if only 32 bits are used to make the
+ * bitmap functions work correctly.
+ */
+unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r,
+				  struct rdt_ctrl_domain *d, unsigned long cbm)
+{
+	unsigned int size = 0;
+	struct cacheinfo *ci;
+	int num_b;
+
+	if (WARN_ON_ONCE(r->ctrl_scope != RESCTRL_L2_CACHE && r->ctrl_scope != RESCTRL_L3_CACHE))
+		return size;
+
+	num_b = bitmap_weight(&cbm, r->cache.cbm_len);
+	ci = get_cpu_cacheinfo_level(cpumask_any(&d->hdr.cpu_mask), r->ctrl_scope);
+	if (ci)
+		size = ci->size / r->cache.cbm_len * num_b;
+
+	return size;
+}
+
+bool is_mba_sc(struct rdt_resource *r)
+{
+	if (!r)
+		r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+
+	/*
+	 * The software controller support is only applicable to MBA resource.
+	 * Make sure to check for resource type.
+	 */
+	if (r->rid != RDT_RESOURCE_MBA)
+		return false;
+
+	return r->membw.mba_sc;
+}
+
+/*
+ * rdtgroup_size_show - Display size in bytes of allocated regions
+ *
+ * The "size" file mirrors the layout of the "schemata" file, printing the
+ * size in bytes of each region instead of the capacity bitmask.
+ */
+static int rdtgroup_size_show(struct kernfs_open_file *of,
+			      struct seq_file *s, void *v)
+{
+	struct resctrl_schema *schema;
+	enum resctrl_conf_type type;
+	struct rdt_ctrl_domain *d;
+	struct rdtgroup *rdtgrp;
+	struct rdt_resource *r;
+	unsigned int size;
+	int ret = 0;
+	u32 closid;
+	bool sep;
+	u32 ctrl;
+
+	rdtgrp = rdtgroup_kn_lock_live(of->kn);
+	if (!rdtgrp) {
+		rdtgroup_kn_unlock(of->kn);
+		return -ENOENT;
+	}
+
+	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+		if (!rdtgrp->plr->d) {
+			rdt_last_cmd_clear();
+			rdt_last_cmd_puts("Cache domain offline\n");
+			ret = -ENODEV;
+		} else {
+			seq_printf(s, "%*s:", max_name_width,
+				   rdtgrp->plr->s->name);
+			size = rdtgroup_cbm_to_size(rdtgrp->plr->s->res,
+						    rdtgrp->plr->d,
+						    rdtgrp->plr->cbm);
+			seq_printf(s, "%d=%u\n", rdtgrp->plr->d->hdr.id, size);
+		}
+		goto out;
+	}
+
+	closid = rdtgrp->closid;
+
+	list_for_each_entry(schema, &resctrl_schema_all, list) {
+		r = schema->res;
+		type = schema->conf_type;
+		sep = false;
+		seq_printf(s, "%*s:", max_name_width, schema->name);
+		list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
+			if (sep)
+				seq_putc(s, ';');
+			if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+				size = 0;
+			} else {
+				if (is_mba_sc(r))
+					ctrl = d->mbps_val[closid];
+				else
+					ctrl = resctrl_arch_get_config(r, d,
+								       closid,
+								       type);
+				if (r->rid == RDT_RESOURCE_MBA ||
+				    r->rid == RDT_RESOURCE_SMBA)
+					size = ctrl;
+				else
+					size = rdtgroup_cbm_to_size(r, d, ctrl);
+			}
+			seq_printf(s, "%d=%u", d->hdr.id, size);
+			sep = true;
+		}
+		seq_putc(s, '\n');
+	}
+
+out:
+	rdtgroup_kn_unlock(of->kn);
+
+	return ret;
+}
+
+static void mondata_config_read(struct resctrl_mon_config_info *mon_info)
+{
+	smp_call_function_any(&mon_info->d->hdr.cpu_mask,
+			      resctrl_arch_mon_event_config_read, mon_info, 1);
+}
+
+static int mbm_config_show(struct seq_file *s, struct rdt_resource *r, u32 evtid)
+{
+	struct resctrl_mon_config_info mon_info;
+	struct rdt_mon_domain *dom;
+	bool sep = false;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	list_for_each_entry(dom, &r->mon_domains, hdr.list) {
+		if (sep)
+			seq_puts(s, ";");
+
+		memset(&mon_info, 0, sizeof(struct resctrl_mon_config_info));
+		mon_info.r = r;
+		mon_info.d = dom;
+		mon_info.evtid = evtid;
+		mondata_config_read(&mon_info);
+
+		seq_printf(s, "%d=0x%02x", dom->hdr.id, mon_info.mon_config);
+		sep = true;
+	}
+	seq_puts(s, "\n");
+
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+
+	return 0;
+}
+
+static int mbm_total_bytes_config_show(struct kernfs_open_file *of,
+				       struct seq_file *seq, void *v)
+{
+	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
+
+	mbm_config_show(seq, r, QOS_L3_MBM_TOTAL_EVENT_ID);
+
+	return 0;
+}
+
+static int mbm_local_bytes_config_show(struct kernfs_open_file *of,
+				       struct seq_file *seq, void *v)
+{
+	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
+
+	mbm_config_show(seq, r, QOS_L3_MBM_LOCAL_EVENT_ID);
+
+	return 0;
+}
+
+static void mbm_config_write_domain(struct rdt_resource *r,
+				    struct rdt_mon_domain *d, u32 evtid, u32 val)
+{
+	struct resctrl_mon_config_info mon_info = {0};
+
+	/*
+	 * Read the current config value first. If both are the same then
+	 * no need to write it again.
+	 */
+	mon_info.r = r;
+	mon_info.d = d;
+	mon_info.evtid = evtid;
+	mondata_config_read(&mon_info);
+	if (mon_info.mon_config == val)
+		return;
+
+	mon_info.mon_config = val;
+
+	/*
+	 * Update MSR_IA32_EVT_CFG_BASE MSR on one of the CPUs in the
+	 * domain. The MSRs offset from MSR MSR_IA32_EVT_CFG_BASE
+	 * are scoped at the domain level. Writing any of these MSRs
+	 * on one CPU is observed by all the CPUs in the domain.
+	 */
+	smp_call_function_any(&d->hdr.cpu_mask, resctrl_arch_mon_event_config_write,
+			      &mon_info, 1);
+
+	/*
+	 * When an Event Configuration is changed, the bandwidth counters
+	 * for all RMIDs and Events will be cleared by the hardware. The
+	 * hardware also sets MSR_IA32_QM_CTR.Unavailable (bit 62) for
+	 * every RMID on the next read to any event for every RMID.
+	 * Subsequent reads will have MSR_IA32_QM_CTR.Unavailable (bit 62)
+	 * cleared while it is tracked by the hardware. Clear the
+	 * mbm_local and mbm_total counts for all the RMIDs.
+	 */
+	resctrl_arch_reset_rmid_all(r, d);
+}
+
+static int mon_config_write(struct rdt_resource *r, char *tok, u32 evtid)
+{
+	char *dom_str = NULL, *id_str;
+	unsigned long dom_id, val;
+	struct rdt_mon_domain *d;
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+next:
+	if (!tok || tok[0] == '\0')
+		return 0;
+
+	/* Start processing the strings for each domain */
+	dom_str = strim(strsep(&tok, ";"));
+	id_str = strsep(&dom_str, "=");
+
+	if (!id_str || kstrtoul(id_str, 10, &dom_id)) {
+		rdt_last_cmd_puts("Missing '=' or non-numeric domain id\n");
+		return -EINVAL;
+	}
+
+	if (!dom_str || kstrtoul(dom_str, 16, &val)) {
+		rdt_last_cmd_puts("Non-numeric event configuration value\n");
+		return -EINVAL;
+	}
+
+	/* Value from user cannot be more than the supported set of events */
+	if ((val & r->mbm_cfg_mask) != val) {
+		rdt_last_cmd_printf("Invalid event configuration: max valid mask is 0x%02x\n",
+				    r->mbm_cfg_mask);
+		return -EINVAL;
+	}
+
+	list_for_each_entry(d, &r->mon_domains, hdr.list) {
+		if (d->hdr.id == dom_id) {
+			mbm_config_write_domain(r, d, evtid, val);
+			goto next;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static ssize_t mbm_total_bytes_config_write(struct kernfs_open_file *of,
+					    char *buf, size_t nbytes,
+					    loff_t off)
+{
+	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
+	int ret;
+
+	/* Valid input requires a trailing newline */
+	if (nbytes == 0 || buf[nbytes - 1] != '\n')
+		return -EINVAL;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	rdt_last_cmd_clear();
+
+	buf[nbytes - 1] = '\0';
+
+	ret = mon_config_write(r, buf, QOS_L3_MBM_TOTAL_EVENT_ID);
+
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+
+	return ret ?: nbytes;
+}
+
+static ssize_t mbm_local_bytes_config_write(struct kernfs_open_file *of,
+					    char *buf, size_t nbytes,
+					    loff_t off)
+{
+	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
+	int ret;
+
+	/* Valid input requires a trailing newline */
+	if (nbytes == 0 || buf[nbytes - 1] != '\n')
+		return -EINVAL;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	rdt_last_cmd_clear();
+
+	buf[nbytes - 1] = '\0';
+
+	ret = mon_config_write(r, buf, QOS_L3_MBM_LOCAL_EVENT_ID);
+
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+
+	return ret ?: nbytes;
+}
+
+/* rdtgroup information files for one cache resource. */
+static struct rftype res_common_files[] = {
+	{
+		.name		= "last_cmd_status",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_last_cmd_status_show,
+		.fflags		= RFTYPE_TOP_INFO,
+	},
+	{
+		.name		= "num_closids",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_num_closids_show,
+		.fflags		= RFTYPE_CTRL_INFO,
+	},
+	{
+		.name		= "mon_features",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_mon_features_show,
+		.fflags		= RFTYPE_MON_INFO,
+	},
+	{
+		.name		= "num_rmids",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_num_rmids_show,
+		.fflags		= RFTYPE_MON_INFO,
+	},
+	{
+		.name		= "cbm_mask",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_default_ctrl_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
+	},
+	{
+		.name		= "min_cbm_bits",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_min_cbm_bits_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
+	},
+	{
+		.name		= "shareable_bits",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_shareable_bits_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
+	},
+	{
+		.name		= "bit_usage",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_bit_usage_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
+	},
+	{
+		.name		= "min_bandwidth",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_min_bw_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
+	},
+	{
+		.name		= "bandwidth_gran",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_bw_gran_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
+	},
+	{
+		.name		= "delay_linear",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_delay_linear_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_MB,
+	},
+	/*
+	 * Platform specific which (if any) capabilities are provided by
+	 * thread_throttle_mode. Defer "fflags" initialization to platform
+	 * discovery.
+	 */
+	{
+		.name		= "thread_throttle_mode",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_thread_throttle_mode_show,
+	},
+	{
+		.name		= "max_threshold_occupancy",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.write		= max_threshold_occ_write,
+		.seq_show	= max_threshold_occ_show,
+		.fflags		= RFTYPE_MON_INFO | RFTYPE_RES_CACHE,
+	},
+	{
+		.name		= "mbm_total_bytes_config",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= mbm_total_bytes_config_show,
+		.write		= mbm_total_bytes_config_write,
+	},
+	{
+		.name		= "mbm_local_bytes_config",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= mbm_local_bytes_config_show,
+		.write		= mbm_local_bytes_config_write,
+	},
+	{
+		.name		= "cpus",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.write		= rdtgroup_cpus_write,
+		.seq_show	= rdtgroup_cpus_show,
+		.fflags		= RFTYPE_BASE,
+	},
+	{
+		.name		= "cpus_list",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.write		= rdtgroup_cpus_write,
+		.seq_show	= rdtgroup_cpus_show,
+		.flags		= RFTYPE_FLAGS_CPUS_LIST,
+		.fflags		= RFTYPE_BASE,
+	},
+	{
+		.name		= "tasks",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.write		= rdtgroup_tasks_write,
+		.seq_show	= rdtgroup_tasks_show,
+		.fflags		= RFTYPE_BASE,
+	},
+	{
+		.name		= "mon_hw_id",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdtgroup_rmid_show,
+		.fflags		= RFTYPE_MON_BASE | RFTYPE_DEBUG,
+	},
+	{
+		.name		= "schemata",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.write		= rdtgroup_schemata_write,
+		.seq_show	= rdtgroup_schemata_show,
+		.fflags		= RFTYPE_CTRL_BASE,
+	},
+	{
+		.name		= "mba_MBps_event",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.write		= rdtgroup_mba_mbps_event_write,
+		.seq_show	= rdtgroup_mba_mbps_event_show,
+	},
+	{
+		.name		= "mode",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.write		= rdtgroup_mode_write,
+		.seq_show	= rdtgroup_mode_show,
+		.fflags		= RFTYPE_CTRL_BASE,
+	},
+	{
+		.name		= "size",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdtgroup_size_show,
+		.fflags		= RFTYPE_CTRL_BASE,
+	},
+	{
+		.name		= "sparse_masks",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdt_has_sparse_bitmasks_show,
+		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
+	},
+	{
+		.name		= "ctrl_hw_id",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= rdtgroup_closid_show,
+		.fflags		= RFTYPE_CTRL_BASE | RFTYPE_DEBUG,
+	},
+};
+
+static int rdtgroup_add_files(struct kernfs_node *kn, unsigned long fflags)
+{
+	struct rftype *rfts, *rft;
+	int ret, len;
+
+	rfts = res_common_files;
+	len = ARRAY_SIZE(res_common_files);
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	if (resctrl_debug)
+		fflags |= RFTYPE_DEBUG;
+
+	for (rft = rfts; rft < rfts + len; rft++) {
+		if (rft->fflags && ((fflags & rft->fflags) == rft->fflags)) {
+			ret = rdtgroup_add_file(kn, rft);
+			if (ret)
+				goto error;
+		}
+	}
+
+	return 0;
+error:
+	pr_warn("Failed to add %s, err=%d\n", rft->name, ret);
+	while (--rft >= rfts) {
+		if ((fflags & rft->fflags) == rft->fflags)
+			kernfs_remove_by_name(kn, rft->name);
+	}
+	return ret;
+}
+
+static struct rftype *rdtgroup_get_rftype_by_name(const char *name)
+{
+	struct rftype *rfts, *rft;
+	int len;
+
+	rfts = res_common_files;
+	len = ARRAY_SIZE(res_common_files);
+
+	for (rft = rfts; rft < rfts + len; rft++) {
+		if (!strcmp(rft->name, name))
+			return rft;
+	}
+
+	return NULL;
+}
+
+static void thread_throttle_mode_init(void)
+{
+	enum membw_throttle_mode throttle_mode = THREAD_THROTTLE_UNDEFINED;
+	struct rdt_resource *r_mba, *r_smba;
+
+	r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+	if (r_mba->alloc_capable &&
+	    r_mba->membw.throttle_mode != THREAD_THROTTLE_UNDEFINED)
+		throttle_mode = r_mba->membw.throttle_mode;
+
+	r_smba = resctrl_arch_get_resource(RDT_RESOURCE_SMBA);
+	if (r_smba->alloc_capable &&
+	    r_smba->membw.throttle_mode != THREAD_THROTTLE_UNDEFINED)
+		throttle_mode = r_smba->membw.throttle_mode;
+
+	if (throttle_mode == THREAD_THROTTLE_UNDEFINED)
+		return;
+
+	resctrl_file_fflags_init("thread_throttle_mode",
+				 RFTYPE_CTRL_INFO | RFTYPE_RES_MB);
+}
+
+void resctrl_file_fflags_init(const char *config, unsigned long fflags)
+{
+	struct rftype *rft;
+
+	rft = rdtgroup_get_rftype_by_name(config);
+	if (rft)
+		rft->fflags = fflags;
+}
+
+/**
+ * rdtgroup_kn_mode_restrict - Restrict user access to named resctrl file
+ * @r: The resource group with which the file is associated.
+ * @name: Name of the file
+ *
+ * The permissions of named resctrl file, directory, or link are modified
+ * to not allow read, write, or execute by any user.
+ *
+ * WARNING: This function is intended to communicate to the user that the
+ * resctrl file has been locked down - that it is not relevant to the
+ * particular state the system finds itself in. It should not be relied
+ * on to protect from user access because after the file's permissions
+ * are restricted the user can still change the permissions using chmod
+ * from the command line.
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name)
+{
+	struct iattr iattr = {.ia_valid = ATTR_MODE,};
+	struct kernfs_node *kn;
+	int ret = 0;
+
+	kn = kernfs_find_and_get_ns(r->kn, name, NULL);
+	if (!kn)
+		return -ENOENT;
+
+	switch (kernfs_type(kn)) {
+	case KERNFS_DIR:
+		iattr.ia_mode = S_IFDIR;
+		break;
+	case KERNFS_FILE:
+		iattr.ia_mode = S_IFREG;
+		break;
+	case KERNFS_LINK:
+		iattr.ia_mode = S_IFLNK;
+		break;
+	}
+
+	ret = kernfs_setattr(kn, &iattr);
+	kernfs_put(kn);
+	return ret;
+}
+
+/**
+ * rdtgroup_kn_mode_restore - Restore user access to named resctrl file
+ * @r: The resource group with which the file is associated.
+ * @name: Name of the file
+ * @mask: Mask of permissions that should be restored
+ *
+ * Restore the permissions of the named file. If @name is a directory the
+ * permissions of its parent will be used.
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
+			     umode_t mask)
+{
+	struct iattr iattr = {.ia_valid = ATTR_MODE,};
+	struct kernfs_node *kn, *parent;
+	struct rftype *rfts, *rft;
+	int ret, len;
+
+	rfts = res_common_files;
+	len = ARRAY_SIZE(res_common_files);
+
+	for (rft = rfts; rft < rfts + len; rft++) {
+		if (!strcmp(rft->name, name))
+			iattr.ia_mode = rft->mode & mask;
+	}
+
+	kn = kernfs_find_and_get_ns(r->kn, name, NULL);
+	if (!kn)
+		return -ENOENT;
+
+	switch (kernfs_type(kn)) {
+	case KERNFS_DIR:
+		parent = kernfs_get_parent(kn);
+		if (parent) {
+			iattr.ia_mode |= parent->mode;
+			kernfs_put(parent);
+		}
+		iattr.ia_mode |= S_IFDIR;
+		break;
+	case KERNFS_FILE:
+		iattr.ia_mode |= S_IFREG;
+		break;
+	case KERNFS_LINK:
+		iattr.ia_mode |= S_IFLNK;
+		break;
+	}
+
+	ret = kernfs_setattr(kn, &iattr);
+	kernfs_put(kn);
+	return ret;
+}
+
+static int rdtgroup_mkdir_info_resdir(void *priv, char *name,
+				      unsigned long fflags)
+{
+	struct kernfs_node *kn_subdir;
+	int ret;
+
+	kn_subdir = kernfs_create_dir(kn_info, name,
+				      kn_info->mode, priv);
+	if (IS_ERR(kn_subdir))
+		return PTR_ERR(kn_subdir);
+
+	ret = rdtgroup_kn_set_ugid(kn_subdir);
+	if (ret)
+		return ret;
+
+	ret = rdtgroup_add_files(kn_subdir, fflags);
+	if (!ret)
+		kernfs_activate(kn_subdir);
+
+	return ret;
+}
+
+static unsigned long fflags_from_resource(struct rdt_resource *r)
+{
+	switch (r->rid) {
+	case RDT_RESOURCE_L3:
+	case RDT_RESOURCE_L2:
+		return RFTYPE_RES_CACHE;
+	case RDT_RESOURCE_MBA:
+	case RDT_RESOURCE_SMBA:
+		return RFTYPE_RES_MB;
+	}
+
+	return WARN_ON_ONCE(1);
+}
+
+static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
+{
+	struct resctrl_schema *s;
+	struct rdt_resource *r;
+	unsigned long fflags;
+	char name[32];
+	int ret;
+
+	/* create the directory */
+	kn_info = kernfs_create_dir(parent_kn, "info", parent_kn->mode, NULL);
+	if (IS_ERR(kn_info))
+		return PTR_ERR(kn_info);
+
+	ret = rdtgroup_add_files(kn_info, RFTYPE_TOP_INFO);
+	if (ret)
+		goto out_destroy;
+
+	/* loop over enabled controls, these are all alloc_capable */
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		r = s->res;
+		fflags = fflags_from_resource(r) | RFTYPE_CTRL_INFO;
+		ret = rdtgroup_mkdir_info_resdir(s, s->name, fflags);
+		if (ret)
+			goto out_destroy;
+	}
+
+	for_each_mon_capable_rdt_resource(r) {
+		fflags = fflags_from_resource(r) | RFTYPE_MON_INFO;
+		sprintf(name, "%s_MON", r->name);
+		ret = rdtgroup_mkdir_info_resdir(r, name, fflags);
+		if (ret)
+			goto out_destroy;
+	}
+
+	ret = rdtgroup_kn_set_ugid(kn_info);
+	if (ret)
+		goto out_destroy;
+
+	kernfs_activate(kn_info);
+
+	return 0;
+
+out_destroy:
+	kernfs_remove(kn_info);
+	return ret;
+}
+
+static int
+mongroup_create_dir(struct kernfs_node *parent_kn, struct rdtgroup *prgrp,
+		    char *name, struct kernfs_node **dest_kn)
+{
+	struct kernfs_node *kn;
+	int ret;
+
+	/* create the directory */
+	kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp);
+	if (IS_ERR(kn))
+		return PTR_ERR(kn);
+
+	if (dest_kn)
+		*dest_kn = kn;
+
+	ret = rdtgroup_kn_set_ugid(kn);
+	if (ret)
+		goto out_destroy;
+
+	kernfs_activate(kn);
+
+	return 0;
+
+out_destroy:
+	kernfs_remove(kn);
+	return ret;
+}
+
+static inline bool is_mba_linear(void)
+{
+	return resctrl_arch_get_resource(RDT_RESOURCE_MBA)->membw.delay_linear;
+}
+
+static int mba_sc_domain_allocate(struct rdt_resource *r, struct rdt_ctrl_domain *d)
+{
+	u32 num_closid = resctrl_arch_get_num_closid(r);
+	int cpu = cpumask_any(&d->hdr.cpu_mask);
+	int i;
+
+	d->mbps_val = kcalloc_node(num_closid, sizeof(*d->mbps_val),
+				   GFP_KERNEL, cpu_to_node(cpu));
+	if (!d->mbps_val)
+		return -ENOMEM;
+
+	for (i = 0; i < num_closid; i++)
+		d->mbps_val[i] = MBA_MAX_MBPS;
+
+	return 0;
+}
+
+static void mba_sc_domain_destroy(struct rdt_resource *r,
+				  struct rdt_ctrl_domain *d)
+{
+	kfree(d->mbps_val);
+	d->mbps_val = NULL;
+}
+
+/*
+ * MBA software controller is supported only if
+ * MBM is supported and MBA is in linear scale,
+ * and the MBM monitor scope is the same as MBA
+ * control scope.
+ */
+static bool supports_mba_mbps(void)
+{
+	struct rdt_resource *rmbm = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+
+	return (resctrl_is_mbm_enabled() &&
+		r->alloc_capable && is_mba_linear() &&
+		r->ctrl_scope == rmbm->mon_scope);
+}
+
+/*
+ * Enable or disable the MBA software controller
+ * which helps user specify bandwidth in MBps.
+ */
+static int set_mba_sc(bool mba_sc)
+{
+	struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
+	u32 num_closid = resctrl_arch_get_num_closid(r);
+	struct rdt_ctrl_domain *d;
+	unsigned long fflags;
+	int i;
+
+	if (!supports_mba_mbps() || mba_sc == is_mba_sc(r))
+		return -EINVAL;
+
+	r->membw.mba_sc = mba_sc;
+
+	rdtgroup_default.mba_mbps_event = mba_mbps_default_event;
+
+	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
+		for (i = 0; i < num_closid; i++)
+			d->mbps_val[i] = MBA_MAX_MBPS;
+	}
+
+	fflags = mba_sc ? RFTYPE_CTRL_BASE | RFTYPE_MON_BASE : 0;
+	resctrl_file_fflags_init("mba_MBps_event", fflags);
+
+	return 0;
+}
+
+/*
+ * We don't allow rdtgroup directories to be created anywhere
+ * except the root directory. Thus when looking for the rdtgroup
+ * structure for a kernfs node we are either looking at a directory,
+ * in which case the rdtgroup structure is pointed at by the "priv"
+ * field, otherwise we have a file, and need only look to the parent
+ * to find the rdtgroup.
+ */
+static struct rdtgroup *kernfs_to_rdtgroup(struct kernfs_node *kn)
+{
+	if (kernfs_type(kn) == KERNFS_DIR) {
+		/*
+		 * All the resource directories use "kn->priv"
+		 * to point to the "struct rdtgroup" for the
+		 * resource. "info" and its subdirectories don't
+		 * have rdtgroup structures, so return NULL here.
+		 */
+		if (kn == kn_info ||
+		    rcu_access_pointer(kn->__parent) == kn_info)
+			return NULL;
+		else
+			return kn->priv;
+	} else {
+		return rdt_kn_parent_priv(kn);
+	}
+}
+
+static void rdtgroup_kn_get(struct rdtgroup *rdtgrp, struct kernfs_node *kn)
+{
+	atomic_inc(&rdtgrp->waitcount);
+	kernfs_break_active_protection(kn);
+}
+
+static void rdtgroup_kn_put(struct rdtgroup *rdtgrp, struct kernfs_node *kn)
+{
+	if (atomic_dec_and_test(&rdtgrp->waitcount) &&
+	    (rdtgrp->flags & RDT_DELETED)) {
+		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
+		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)
+			rdtgroup_pseudo_lock_remove(rdtgrp);
+		kernfs_unbreak_active_protection(kn);
+		rdtgroup_remove(rdtgrp);
+	} else {
+		kernfs_unbreak_active_protection(kn);
+	}
+}
+
+struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn)
+{
+	struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn);
+
+	if (!rdtgrp)
+		return NULL;
+
+	rdtgroup_kn_get(rdtgrp, kn);
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	/* Was this group deleted while we waited? */
+	if (rdtgrp->flags & RDT_DELETED)
+		return NULL;
+
+	return rdtgrp;
+}
+
+void rdtgroup_kn_unlock(struct kernfs_node *kn)
+{
+	struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn);
+
+	if (!rdtgrp)
+		return;
+
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+
+	rdtgroup_kn_put(rdtgrp, kn);
+}
+
+static int mkdir_mondata_all(struct kernfs_node *parent_kn,
+			     struct rdtgroup *prgrp,
+			     struct kernfs_node **mon_data_kn);
+
+static void rdt_disable_ctx(void)
+{
+	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
+	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
+	set_mba_sc(false);
+
+	resctrl_debug = false;
+}
+
+static int rdt_enable_ctx(struct rdt_fs_context *ctx)
+{
+	int ret = 0;
+
+	if (ctx->enable_cdpl2) {
+		ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, true);
+		if (ret)
+			goto out_done;
+	}
+
+	if (ctx->enable_cdpl3) {
+		ret = resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, true);
+		if (ret)
+			goto out_cdpl2;
+	}
+
+	if (ctx->enable_mba_mbps) {
+		ret = set_mba_sc(true);
+		if (ret)
+			goto out_cdpl3;
+	}
+
+	if (ctx->enable_debug)
+		resctrl_debug = true;
+
+	return 0;
+
+out_cdpl3:
+	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false);
+out_cdpl2:
+	resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false);
+out_done:
+	return ret;
+}
+
+static int schemata_list_add(struct rdt_resource *r, enum resctrl_conf_type type)
+{
+	struct resctrl_schema *s;
+	const char *suffix = "";
+	int ret, cl;
+
+	s = kzalloc(sizeof(*s), GFP_KERNEL);
+	if (!s)
+		return -ENOMEM;
+
+	s->res = r;
+	s->num_closid = resctrl_arch_get_num_closid(r);
+	if (resctrl_arch_get_cdp_enabled(r->rid))
+		s->num_closid /= 2;
+
+	s->conf_type = type;
+	switch (type) {
+	case CDP_CODE:
+		suffix = "CODE";
+		break;
+	case CDP_DATA:
+		suffix = "DATA";
+		break;
+	case CDP_NONE:
+		suffix = "";
+		break;
+	}
+
+	ret = snprintf(s->name, sizeof(s->name), "%s%s", r->name, suffix);
+	if (ret >= sizeof(s->name)) {
+		kfree(s);
+		return -EINVAL;
+	}
+
+	cl = strlen(s->name);
+
+	/*
+	 * If CDP is supported by this resource, but not enabled,
+	 * include the suffix. This ensures the tabular format of the
+	 * schemata file does not change between mounts of the filesystem.
+	 */
+	if (r->cdp_capable && !resctrl_arch_get_cdp_enabled(r->rid))
+		cl += 4;
+
+	if (cl > max_name_width)
+		max_name_width = cl;
+
+	switch (r->schema_fmt) {
+	case RESCTRL_SCHEMA_BITMAP:
+		s->fmt_str = "%d=%x";
+		break;
+	case RESCTRL_SCHEMA_RANGE:
+		s->fmt_str = "%d=%u";
+		break;
+	}
+
+	if (WARN_ON_ONCE(!s->fmt_str)) {
+		kfree(s);
+		return -EINVAL;
+	}
+
+	INIT_LIST_HEAD(&s->list);
+	list_add(&s->list, &resctrl_schema_all);
+
+	return 0;
+}
+
+static int schemata_list_create(void)
+{
+	struct rdt_resource *r;
+	int ret = 0;
+
+	for_each_alloc_capable_rdt_resource(r) {
+		if (resctrl_arch_get_cdp_enabled(r->rid)) {
+			ret = schemata_list_add(r, CDP_CODE);
+			if (ret)
+				break;
+
+			ret = schemata_list_add(r, CDP_DATA);
+		} else {
+			ret = schemata_list_add(r, CDP_NONE);
+		}
+
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+static void schemata_list_destroy(void)
+{
+	struct resctrl_schema *s, *tmp;
+
+	list_for_each_entry_safe(s, tmp, &resctrl_schema_all, list) {
+		list_del(&s->list);
+		kfree(s);
+	}
+}
+
+static int rdt_get_tree(struct fs_context *fc)
+{
+	struct rdt_fs_context *ctx = rdt_fc2context(fc);
+	unsigned long flags = RFTYPE_CTRL_BASE;
+	struct rdt_mon_domain *dom;
+	struct rdt_resource *r;
+	int ret;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+	/*
+	 * resctrl file system can only be mounted once.
+	 */
+	if (resctrl_mounted) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	ret = rdtgroup_setup_root(ctx);
+	if (ret)
+		goto out;
+
+	ret = rdt_enable_ctx(ctx);
+	if (ret)
+		goto out_root;
+
+	ret = schemata_list_create();
+	if (ret) {
+		schemata_list_destroy();
+		goto out_ctx;
+	}
+
+	ret = closid_init();
+	if (ret)
+		goto out_schemata_free;
+
+	if (resctrl_arch_mon_capable())
+		flags |= RFTYPE_MON;
+
+	ret = rdtgroup_add_files(rdtgroup_default.kn, flags);
+	if (ret)
+		goto out_closid_exit;
+
+	kernfs_activate(rdtgroup_default.kn);
+
+	ret = rdtgroup_create_info_dir(rdtgroup_default.kn);
+	if (ret < 0)
+		goto out_closid_exit;
+
+	if (resctrl_arch_mon_capable()) {
+		ret = mongroup_create_dir(rdtgroup_default.kn,
+					  &rdtgroup_default, "mon_groups",
+					  &kn_mongrp);
+		if (ret < 0)
+			goto out_info;
+
+		ret = mkdir_mondata_all(rdtgroup_default.kn,
+					&rdtgroup_default, &kn_mondata);
+		if (ret < 0)
+			goto out_mongrp;
+		rdtgroup_default.mon.mon_data_kn = kn_mondata;
+	}
+
+	ret = rdt_pseudo_lock_init();
+	if (ret)
+		goto out_mondata;
+
+	ret = kernfs_get_tree(fc);
+	if (ret < 0)
+		goto out_psl;
+
+	if (resctrl_arch_alloc_capable())
+		resctrl_arch_enable_alloc();
+	if (resctrl_arch_mon_capable())
+		resctrl_arch_enable_mon();
+
+	if (resctrl_arch_alloc_capable() || resctrl_arch_mon_capable())
+		resctrl_mounted = true;
+
+	if (resctrl_is_mbm_enabled()) {
+		r = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+		list_for_each_entry(dom, &r->mon_domains, hdr.list)
+			mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL,
+						   RESCTRL_PICK_ANY_CPU);
+	}
+
+	goto out;
+
+out_psl:
+	rdt_pseudo_lock_release();
+out_mondata:
+	if (resctrl_arch_mon_capable())
+		kernfs_remove(kn_mondata);
+out_mongrp:
+	if (resctrl_arch_mon_capable())
+		kernfs_remove(kn_mongrp);
+out_info:
+	kernfs_remove(kn_info);
+out_closid_exit:
+	closid_exit();
+out_schemata_free:
+	schemata_list_destroy();
+out_ctx:
+	rdt_disable_ctx();
+out_root:
+	rdtgroup_destroy_root();
+out:
+	rdt_last_cmd_clear();
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+	return ret;
+}
+
+enum rdt_param {
+	Opt_cdp,
+	Opt_cdpl2,
+	Opt_mba_mbps,
+	Opt_debug,
+	nr__rdt_params
+};
+
+static const struct fs_parameter_spec rdt_fs_parameters[] = {
+	fsparam_flag("cdp",		Opt_cdp),
+	fsparam_flag("cdpl2",		Opt_cdpl2),
+	fsparam_flag("mba_MBps",	Opt_mba_mbps),
+	fsparam_flag("debug",		Opt_debug),
+	{}
+};
+
+static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+	struct rdt_fs_context *ctx = rdt_fc2context(fc);
+	struct fs_parse_result result;
+	const char *msg;
+	int opt;
+
+	opt = fs_parse(fc, rdt_fs_parameters, param, &result);
+	if (opt < 0)
+		return opt;
+
+	switch (opt) {
+	case Opt_cdp:
+		ctx->enable_cdpl3 = true;
+		return 0;
+	case Opt_cdpl2:
+		ctx->enable_cdpl2 = true;
+		return 0;
+	case Opt_mba_mbps:
+		msg = "mba_MBps requires MBM and linear scale MBA at L3 scope";
+		if (!supports_mba_mbps())
+			return invalfc(fc, msg);
+		ctx->enable_mba_mbps = true;
+		return 0;
+	case Opt_debug:
+		ctx->enable_debug = true;
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static void rdt_fs_context_free(struct fs_context *fc)
+{
+	struct rdt_fs_context *ctx = rdt_fc2context(fc);
+
+	kernfs_free_fs_context(fc);
+	kfree(ctx);
+}
+
+static const struct fs_context_operations rdt_fs_context_ops = {
+	.free		= rdt_fs_context_free,
+	.parse_param	= rdt_parse_param,
+	.get_tree	= rdt_get_tree,
+};
+
+static int rdt_init_fs_context(struct fs_context *fc)
+{
+	struct rdt_fs_context *ctx;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->kfc.magic = RDTGROUP_SUPER_MAGIC;
+	fc->fs_private = &ctx->kfc;
+	fc->ops = &rdt_fs_context_ops;
+	put_user_ns(fc->user_ns);
+	fc->user_ns = get_user_ns(&init_user_ns);
+	fc->global = true;
+	return 0;
+}
+
+/*
+ * Move tasks from one to the other group. If @from is NULL, then all tasks
+ * in the systems are moved unconditionally (used for teardown).
+ *
+ * If @mask is not NULL the cpus on which moved tasks are running are set
+ * in that mask so the update smp function call is restricted to affected
+ * cpus.
+ */
+static void rdt_move_group_tasks(struct rdtgroup *from, struct rdtgroup *to,
+				 struct cpumask *mask)
+{
+	struct task_struct *p, *t;
+
+	read_lock(&tasklist_lock);
+	for_each_process_thread(p, t) {
+		if (!from || is_closid_match(t, from) ||
+		    is_rmid_match(t, from)) {
+			resctrl_arch_set_closid_rmid(t, to->closid,
+						     to->mon.rmid);
+
+			/*
+			 * Order the closid/rmid stores above before the loads
+			 * in task_curr(). This pairs with the full barrier
+			 * between the rq->curr update and
+			 * resctrl_arch_sched_in() during context switch.
+			 */
+			smp_mb();
+
+			/*
+			 * If the task is on a CPU, set the CPU in the mask.
+			 * The detection is inaccurate as tasks might move or
+			 * schedule before the smp function call takes place.
+			 * In such a case the function call is pointless, but
+			 * there is no other side effect.
+			 */
+			if (IS_ENABLED(CONFIG_SMP) && mask && task_curr(t))
+				cpumask_set_cpu(task_cpu(t), mask);
+		}
+	}
+	read_unlock(&tasklist_lock);
+}
+
+static void free_all_child_rdtgrp(struct rdtgroup *rdtgrp)
+{
+	struct rdtgroup *sentry, *stmp;
+	struct list_head *head;
+
+	head = &rdtgrp->mon.crdtgrp_list;
+	list_for_each_entry_safe(sentry, stmp, head, mon.crdtgrp_list) {
+		free_rmid(sentry->closid, sentry->mon.rmid);
+		list_del(&sentry->mon.crdtgrp_list);
+
+		if (atomic_read(&sentry->waitcount) != 0)
+			sentry->flags = RDT_DELETED;
+		else
+			rdtgroup_remove(sentry);
+	}
+}
+
+/*
+ * Forcibly remove all of subdirectories under root.
+ */
+static void rmdir_all_sub(void)
+{
+	struct rdtgroup *rdtgrp, *tmp;
+
+	/* Move all tasks to the default resource group */
+	rdt_move_group_tasks(NULL, &rdtgroup_default, NULL);
+
+	list_for_each_entry_safe(rdtgrp, tmp, &rdt_all_groups, rdtgroup_list) {
+		/* Free any child rmids */
+		free_all_child_rdtgrp(rdtgrp);
+
+		/* Remove each rdtgroup other than root */
+		if (rdtgrp == &rdtgroup_default)
+			continue;
+
+		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
+		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)
+			rdtgroup_pseudo_lock_remove(rdtgrp);
+
+		/*
+		 * Give any CPUs back to the default group. We cannot copy
+		 * cpu_online_mask because a CPU might have executed the
+		 * offline callback already, but is still marked online.
+		 */
+		cpumask_or(&rdtgroup_default.cpu_mask,
+			   &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);
+
+		free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+
+		kernfs_remove(rdtgrp->kn);
+		list_del(&rdtgrp->rdtgroup_list);
+
+		if (atomic_read(&rdtgrp->waitcount) != 0)
+			rdtgrp->flags = RDT_DELETED;
+		else
+			rdtgroup_remove(rdtgrp);
+	}
+	/* Notify online CPUs to update per cpu storage and PQR_ASSOC MSR */
+	update_closid_rmid(cpu_online_mask, &rdtgroup_default);
+
+	kernfs_remove(kn_info);
+	kernfs_remove(kn_mongrp);
+	kernfs_remove(kn_mondata);
+}
+
+/**
+ * mon_get_kn_priv() - Get the mon_data priv data for this event.
+ *
+ * The same values are used across the mon_data directories of all control and
+ * monitor groups for the same event in the same domain. Keep a list of
+ * allocated structures and re-use an existing one with the same values for
+ * @rid, @domid, etc.
+ *
+ * @rid:    The resource id for the event file being created.
+ * @domid:  The domain id for the event file being created.
+ * @mevt:   The type of event file being created.
+ * @do_sum: Whether SNC summing monitors are being created.
+ */
+static struct mon_data *mon_get_kn_priv(enum resctrl_res_level rid, int domid,
+					struct mon_evt *mevt,
+					bool do_sum)
+{
+	struct mon_data *priv;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	list_for_each_entry(priv, &mon_data_kn_priv_list, list) {
+		if (priv->rid == rid && priv->domid == domid &&
+		    priv->sum == do_sum && priv->evtid == mevt->evtid)
+			return priv;
+	}
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return NULL;
+
+	priv->rid = rid;
+	priv->domid = domid;
+	priv->sum = do_sum;
+	priv->evtid = mevt->evtid;
+	list_add_tail(&priv->list, &mon_data_kn_priv_list);
+
+	return priv;
+}
+
+/**
+ * mon_put_kn_priv() - Free all allocated mon_data structures.
+ *
+ * Called when resctrl file system is unmounted.
+ */
+static void mon_put_kn_priv(void)
+{
+	struct mon_data *priv, *tmp;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	list_for_each_entry_safe(priv, tmp, &mon_data_kn_priv_list, list) {
+		list_del(&priv->list);
+		kfree(priv);
+	}
+}
+
+static void resctrl_fs_teardown(void)
+{
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	/* Cleared by rdtgroup_destroy_root() */
+	if (!rdtgroup_default.kn)
+		return;
+
+	rmdir_all_sub();
+	mon_put_kn_priv();
+	rdt_pseudo_lock_release();
+	rdtgroup_default.mode = RDT_MODE_SHAREABLE;
+	closid_exit();
+	schemata_list_destroy();
+	rdtgroup_destroy_root();
+}
+
+static void rdt_kill_sb(struct super_block *sb)
+{
+	struct rdt_resource *r;
+
+	cpus_read_lock();
+	mutex_lock(&rdtgroup_mutex);
+
+	rdt_disable_ctx();
+
+	/* Put everything back to default values. */
+	for_each_alloc_capable_rdt_resource(r)
+		resctrl_arch_reset_all_ctrls(r);
+
+	resctrl_fs_teardown();
+	if (resctrl_arch_alloc_capable())
+		resctrl_arch_disable_alloc();
+	if (resctrl_arch_mon_capable())
+		resctrl_arch_disable_mon();
+	resctrl_mounted = false;
+	kernfs_kill_sb(sb);
+	mutex_unlock(&rdtgroup_mutex);
+	cpus_read_unlock();
+}
+
+static struct file_system_type rdt_fs_type = {
+	.name			= "resctrl",
+	.init_fs_context	= rdt_init_fs_context,
+	.parameters		= rdt_fs_parameters,
+	.kill_sb		= rdt_kill_sb,
+};
+
+static int mon_addfile(struct kernfs_node *parent_kn, const char *name,
+		       void *priv)
+{
+	struct kernfs_node *kn;
+	int ret = 0;
+
+	kn = __kernfs_create_file(parent_kn, name, 0444,
+				  GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, 0,
+				  &kf_mondata_ops, priv, NULL, NULL);
+	if (IS_ERR(kn))
+		return PTR_ERR(kn);
+
+	ret = rdtgroup_kn_set_ugid(kn);
+	if (ret) {
+		kernfs_remove(kn);
+		return ret;
+	}
+
+	return ret;
+}
+
+static void mon_rmdir_one_subdir(struct kernfs_node *pkn, char *name, char *subname)
+{
+	struct kernfs_node *kn;
+
+	kn = kernfs_find_and_get(pkn, name);
+	if (!kn)
+		return;
+	kernfs_put(kn);
+
+	if (kn->dir.subdirs <= 1)
+		kernfs_remove(kn);
+	else
+		kernfs_remove_by_name(kn, subname);
+}
+
+/*
+ * Remove all subdirectories of mon_data of ctrl_mon groups
+ * and monitor groups for the given domain.
+ * Remove files and directories containing "sum" of domain data
+ * when last domain being summed is removed.
+ */
+static void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
+					   struct rdt_mon_domain *d)
+{
+	struct rdtgroup *prgrp, *crgrp;
+	char subname[32];
+	bool snc_mode;
+	char name[32];
+
+	snc_mode = r->mon_scope == RESCTRL_L3_NODE;
+	sprintf(name, "mon_%s_%02d", r->name, snc_mode ? d->ci->id : d->hdr.id);
+	if (snc_mode)
+		sprintf(subname, "mon_sub_%s_%02d", r->name, d->hdr.id);
+
+	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
+		mon_rmdir_one_subdir(prgrp->mon.mon_data_kn, name, subname);
+
+		list_for_each_entry(crgrp, &prgrp->mon.crdtgrp_list, mon.crdtgrp_list)
+			mon_rmdir_one_subdir(crgrp->mon.mon_data_kn, name, subname);
+	}
+}
+
+static int mon_add_all_files(struct kernfs_node *kn, struct rdt_mon_domain *d,
+			     struct rdt_resource *r, struct rdtgroup *prgrp,
+			     bool do_sum)
+{
+	struct rmid_read rr = {0};
+	struct mon_data *priv;
+	struct mon_evt *mevt;
+	int ret, domid;
+
+	if (WARN_ON(list_empty(&r->evt_list)))
+		return -EPERM;
+
+	list_for_each_entry(mevt, &r->evt_list, list) {
+		domid = do_sum ? d->ci->id : d->hdr.id;
+		priv = mon_get_kn_priv(r->rid, domid, mevt, do_sum);
+		if (WARN_ON_ONCE(!priv))
+			return -EINVAL;
+
+		ret = mon_addfile(kn, mevt->name, priv);
+		if (ret)
+			return ret;
+
+		if (!do_sum && resctrl_is_mbm_event(mevt->evtid))
+			mon_event_read(&rr, r, d, prgrp, &d->hdr.cpu_mask, mevt->evtid, true);
+	}
+
+	return 0;
+}
+
+static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
+				struct rdt_mon_domain *d,
+				struct rdt_resource *r, struct rdtgroup *prgrp)
+{
+	struct kernfs_node *kn, *ckn;
+	char name[32];
+	bool snc_mode;
+	int ret = 0;
+
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	snc_mode = r->mon_scope == RESCTRL_L3_NODE;
+	sprintf(name, "mon_%s_%02d", r->name, snc_mode ? d->ci->id : d->hdr.id);
+	kn = kernfs_find_and_get(parent_kn, name);
+	if (kn) {
+		/*
+		 * rdtgroup_mutex will prevent this directory from being
+		 * removed. No need to keep this hold.
+		 */
+		kernfs_put(kn);
+	} else {
+		kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp);
+		if (IS_ERR(kn))
+			return PTR_ERR(kn);
+
+		ret = rdtgroup_kn_set_ugid(kn);
+		if (ret)
+			goto out_destroy;
+		ret = mon_add_all_files(kn, d, r, prgrp, snc_mode);
+		if (ret)
+			goto out_destroy;
+	}
+
+	if (snc_mode) {
+		sprintf(name, "mon_sub_%s_%02d", r->name, d->hdr.id);
+		ckn = kernfs_create_dir(kn, name, parent_kn->mode, prgrp);
+		if (IS_ERR(ckn)) {
+			ret = -EINVAL;
+			goto out_destroy;
+		}
+
+		ret = rdtgroup_kn_set_ugid(ckn);
+		if (ret)
+			goto out_destroy;
+
+		ret = mon_add_all_files(ckn, d, r, prgrp, false);
+		if (ret)
+			goto out_destroy;
+	}
+
+	kernfs_activate(kn);
+	return 0;
+
+out_destroy:
+	kernfs_remove(kn);
+	return ret;
+}
+
+/*
+ * Add all subdirectories of mon_data for "ctrl_mon" groups
+ * and "monitor" groups with given domain id.
+ */
+static void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
+					   struct rdt_mon_domain *d)
+{
+	struct kernfs_node *parent_kn;
+	struct rdtgroup *prgrp, *crgrp;
+	struct list_head *head;
+
+	list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
+		parent_kn = prgrp->mon.mon_data_kn;
+		mkdir_mondata_subdir(parent_kn, d, r, prgrp);
+
+		head = &prgrp->mon.crdtgrp_list;
+		list_for_each_entry(crgrp, head, mon.crdtgrp_list) {
+			parent_kn = crgrp->mon.mon_data_kn;
+			mkdir_mondata_subdir(parent_kn, d, r, crgrp);
+		}
+	}
+}
+
+static int mkdir_mondata_subdir_alldom(struct kernfs_node *parent_kn,
+				       struct rdt_resource *r,
+				       struct rdtgroup *prgrp)
+{
+	struct rdt_mon_domain *dom;
+	int ret;
+
+	/* Walking r->domains, ensure it can't race with cpuhp */
+	lockdep_assert_cpus_held();
+
+	list_for_each_entry(dom, &r->mon_domains, hdr.list) {
+		ret = mkdir_mondata_subdir(parent_kn, dom, r, prgrp);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+/*
+ * This creates a directory mon_data which contains the monitored data.
+ *
+ * mon_data has one directory for each domain which are named
+ * in the format mon_<domain_name>_<domain_id>. For ex: A mon_data
+ * with L3 domain looks as below:
+ * ./mon_data:
+ * mon_L3_00
+ * mon_L3_01
+ * mon_L3_02
+ * ...
+ *
+ * Each domain directory has one file per event:
+ * ./mon_L3_00/:
+ * llc_occupancy
+ *
+ */
+static int mkdir_mondata_all(struct kernfs_node *parent_kn,
+			     struct rdtgroup *prgrp,
+			     struct kernfs_node **dest_kn)
+{
+	struct rdt_resource *r;
+	struct kernfs_node *kn;
+	int ret;
+
+	/*
+	 * Create the mon_data directory first.
+	 */
+	ret = mongroup_create_dir(parent_kn, prgrp, "mon_data", &kn);
+	if (ret)
+		return ret;
+
+	if (dest_kn)
+		*dest_kn = kn;
+
+	/*
+	 * Create the subdirectories for each domain. Note that all events
+	 * in a domain like L3 are grouped into a resource whose domain is L3
+	 */
+	for_each_mon_capable_rdt_resource(r) {
+		ret = mkdir_mondata_subdir_alldom(kn, r, prgrp);
+		if (ret)
+			goto out_destroy;
+	}
+
+	return 0;
+
+out_destroy:
+	kernfs_remove(kn);
+	return ret;
+}
+
+/**
+ * cbm_ensure_valid - Enforce validity on provided CBM
+ * @_val:	Candidate CBM
+ * @r:		RDT resource to which the CBM belongs
+ *
+ * The provided CBM represents all cache portions available for use. This
+ * may be represented by a bitmap that does not consist of contiguous ones
+ * and thus be an invalid CBM.
+ * Here the provided CBM is forced to be a valid CBM by only considering
+ * the first set of contiguous bits as valid and clearing all bits.
+ * The intention here is to provide a valid default CBM with which a new
+ * resource group is initialized. The user can follow this with a
+ * modification to the CBM if the default does not satisfy the
+ * requirements.
+ */
+static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
+{
+	unsigned int cbm_len = r->cache.cbm_len;
+	unsigned long first_bit, zero_bit;
+	unsigned long val = _val;
+
+	if (!val)
+		return 0;
+
+	first_bit = find_first_bit(&val, cbm_len);
+	zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
+
+	/* Clear any remaining bits to ensure contiguous region */
+	bitmap_clear(&val, zero_bit, cbm_len - zero_bit);
+	return (u32)val;
+}
+
+/*
+ * Initialize cache resources per RDT domain
+ *
+ * Set the RDT domain up to start off with all usable allocations. That is,
+ * all shareable and unused bits. All-zero CBM is invalid.
+ */
+static int __init_one_rdt_domain(struct rdt_ctrl_domain *d, struct resctrl_schema *s,
+				 u32 closid)
+{
+	enum resctrl_conf_type peer_type = resctrl_peer_type(s->conf_type);
+	enum resctrl_conf_type t = s->conf_type;
+	struct resctrl_staged_config *cfg;
+	struct rdt_resource *r = s->res;
+	u32 used_b = 0, unused_b = 0;
+	unsigned long tmp_cbm;
+	enum rdtgrp_mode mode;
+	u32 peer_ctl, ctrl_val;
+	int i;
+
+	cfg = &d->staged_config[t];
+	cfg->have_new_ctrl = false;
+	cfg->new_ctrl = r->cache.shareable_bits;
+	used_b = r->cache.shareable_bits;
+	for (i = 0; i < closids_supported(); i++) {
+		if (closid_allocated(i) && i != closid) {
+			mode = rdtgroup_mode_by_closid(i);
+			if (mode == RDT_MODE_PSEUDO_LOCKSETUP)
+				/*
+				 * ctrl values for locksetup aren't relevant
+				 * until the schemata is written, and the mode
+				 * becomes RDT_MODE_PSEUDO_LOCKED.
+				 */
+				continue;
+			/*
+			 * If CDP is active include peer domain's
+			 * usage to ensure there is no overlap
+			 * with an exclusive group.
+			 */
+			if (resctrl_arch_get_cdp_enabled(r->rid))
+				peer_ctl = resctrl_arch_get_config(r, d, i,
+								   peer_type);
+			else
+				peer_ctl = 0;
+			ctrl_val = resctrl_arch_get_config(r, d, i,
+							   s->conf_type);
+			used_b |= ctrl_val | peer_ctl;
+			if (mode == RDT_MODE_SHAREABLE)
+				cfg->new_ctrl |= ctrl_val | peer_ctl;
+		}
+	}
+	if (d->plr && d->plr->cbm > 0)
+		used_b |= d->plr->cbm;
+	unused_b = used_b ^ (BIT_MASK(r->cache.cbm_len) - 1);
+	unused_b &= BIT_MASK(r->cache.cbm_len) - 1;
+	cfg->new_ctrl |= unused_b;
+	/*
+	 * Force the initial CBM to be valid, user can
+	 * modify the CBM based on system availability.
+	 */
+	cfg->new_ctrl = cbm_ensure_valid(cfg->new_ctrl, r);
+	/*
+	 * Assign the u32 CBM to an unsigned long to ensure that
+	 * bitmap_weight() does not access out-of-bound memory.
+	 */
+	tmp_cbm = cfg->new_ctrl;
+	if (bitmap_weight(&tmp_cbm, r->cache.cbm_len) < r->cache.min_cbm_bits) {
+		rdt_last_cmd_printf("No space on %s:%d\n", s->name, d->hdr.id);
+		return -ENOSPC;
+	}
+	cfg->have_new_ctrl = true;
+
+	return 0;
+}
+
+/*
+ * Initialize cache resources with default values.
+ *
+ * A new RDT group is being created on an allocation capable (CAT)
+ * supporting system. Set this group up to start off with all usable
+ * allocations.
+ *
+ * If there are no more shareable bits available on any domain then
+ * the entire allocation will fail.
+ */
+static int rdtgroup_init_cat(struct resctrl_schema *s, u32 closid)
+{
+	struct rdt_ctrl_domain *d;
+	int ret;
+
+	list_for_each_entry(d, &s->res->ctrl_domains, hdr.list) {
+		ret = __init_one_rdt_domain(d, s, closid);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+/* Initialize MBA resource with default values. */
+static void rdtgroup_init_mba(struct rdt_resource *r, u32 closid)
+{
+	struct resctrl_staged_config *cfg;
+	struct rdt_ctrl_domain *d;
+
+	list_for_each_entry(d, &r->ctrl_domains, hdr.list) {
+		if (is_mba_sc(r)) {
+			d->mbps_val[closid] = MBA_MAX_MBPS;
+			continue;
+		}
+
+		cfg = &d->staged_config[CDP_NONE];
+		cfg->new_ctrl = resctrl_get_default_ctrl(r);
+		cfg->have_new_ctrl = true;
+	}
+}
+
+/* Initialize the RDT group's allocations. */
+static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
+{
+	struct resctrl_schema *s;
+	struct rdt_resource *r;
+	int ret = 0;
+
+	rdt_staged_configs_clear();
+
+	list_for_each_entry(s, &resctrl_schema_all, list) {
+		r = s->res;
+		if (r->rid == RDT_RESOURCE_MBA ||
+		    r->rid == RDT_RESOURCE_SMBA) {
+			rdtgroup_init_mba(r, rdtgrp->closid);
+			if (is_mba_sc(r))
+				continue;
+		} else {
+			ret = rdtgroup_init_cat(s, rdtgrp->closid);
+			if (ret < 0)
+				goto out;
+		}
+
+		ret = resctrl_arch_update_domains(r, rdtgrp->closid);
+		if (ret < 0) {
+			rdt_last_cmd_puts("Failed to initialize allocations\n");
+			goto out;
+		}
+	}
+
+	rdtgrp->mode = RDT_MODE_SHAREABLE;
+
+out:
+	rdt_staged_configs_clear();
+	return ret;
+}
+
+static int mkdir_rdt_prepare_rmid_alloc(struct rdtgroup *rdtgrp)
+{
+	int ret;
+
+	if (!resctrl_arch_mon_capable())
+		return 0;
+
+	ret = alloc_rmid(rdtgrp->closid);
+	if (ret < 0) {
+		rdt_last_cmd_puts("Out of RMIDs\n");
+		return ret;
+	}
+	rdtgrp->mon.rmid = ret;
+
+	ret = mkdir_mondata_all(rdtgrp->kn, rdtgrp, &rdtgrp->mon.mon_data_kn);
+	if (ret) {
+		rdt_last_cmd_puts("kernfs subdir error\n");
+		free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void mkdir_rdt_prepare_rmid_free(struct rdtgroup *rgrp)
+{
+	if (resctrl_arch_mon_capable())
+		free_rmid(rgrp->closid, rgrp->mon.rmid);
+}
+
+/*
+ * We allow creating mon groups only with in a directory called "mon_groups"
+ * which is present in every ctrl_mon group. Check if this is a valid
+ * "mon_groups" directory.
+ *
+ * 1. The directory should be named "mon_groups".
+ * 2. The mon group itself should "not" be named "mon_groups".
+ *   This makes sure "mon_groups" directory always has a ctrl_mon group
+ *   as parent.
+ */
+static bool is_mon_groups(struct kernfs_node *kn, const char *name)
+{
+	return (!strcmp(rdt_kn_name(kn), "mon_groups") &&
+		strcmp(name, "mon_groups"));
+}
+
+static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
+			     const char *name, umode_t mode,
+			     enum rdt_group_type rtype, struct rdtgroup **r)
+{
+	struct rdtgroup *prdtgrp, *rdtgrp;
+	unsigned long files = 0;
+	struct kernfs_node *kn;
+	int ret;
+
+	prdtgrp = rdtgroup_kn_lock_live(parent_kn);
+	if (!prdtgrp) {
+		ret = -ENODEV;
+		goto out_unlock;
+	}
+
+	/*
+	 * Check that the parent directory for a monitor group is a "mon_groups"
+	 * directory.
+	 */
+	if (rtype == RDTMON_GROUP && !is_mon_groups(parent_kn, name)) {
+		ret = -EPERM;
+		goto out_unlock;
+	}
+
+	if (rtype == RDTMON_GROUP &&
+	    (prdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
+	     prdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)) {
+		ret = -EINVAL;
+		rdt_last_cmd_puts("Pseudo-locking in progress\n");
+		goto out_unlock;
+	}
+
+	/* allocate the rdtgroup. */
+	rdtgrp = kzalloc(sizeof(*rdtgrp), GFP_KERNEL);
+	if (!rdtgrp) {
+		ret = -ENOSPC;
+		rdt_last_cmd_puts("Kernel out of memory\n");
+		goto out_unlock;
+	}
+	*r = rdtgrp;
+	rdtgrp->mon.parent = prdtgrp;
+	rdtgrp->type = rtype;
+	INIT_LIST_HEAD(&rdtgrp->mon.crdtgrp_list);
+
+	/* kernfs creates the directory for rdtgrp */
+	kn = kernfs_create_dir(parent_kn, name, mode, rdtgrp);
+	if (IS_ERR(kn)) {
+		ret = PTR_ERR(kn);
+		rdt_last_cmd_puts("kernfs create error\n");
+		goto out_free_rgrp;
+	}
+	rdtgrp->kn = kn;
+
+	/*
+	 * kernfs_remove() will drop the reference count on "kn" which
+	 * will free it. But we still need it to stick around for the
+	 * rdtgroup_kn_unlock(kn) call. Take one extra reference here,
+	 * which will be dropped by kernfs_put() in rdtgroup_remove().
+	 */
+	kernfs_get(kn);
+
+	ret = rdtgroup_kn_set_ugid(kn);
+	if (ret) {
+		rdt_last_cmd_puts("kernfs perm error\n");
+		goto out_destroy;
+	}
+
+	if (rtype == RDTCTRL_GROUP) {
+		files = RFTYPE_BASE | RFTYPE_CTRL;
+		if (resctrl_arch_mon_capable())
+			files |= RFTYPE_MON;
+	} else {
+		files = RFTYPE_BASE | RFTYPE_MON;
+	}
+
+	ret = rdtgroup_add_files(kn, files);
+	if (ret) {
+		rdt_last_cmd_puts("kernfs fill error\n");
+		goto out_destroy;
+	}
+
+	/*
+	 * The caller unlocks the parent_kn upon success.
+	 */
+	return 0;
+
+out_destroy:
+	kernfs_put(rdtgrp->kn);
+	kernfs_remove(rdtgrp->kn);
+out_free_rgrp:
+	kfree(rdtgrp);
+out_unlock:
+	rdtgroup_kn_unlock(parent_kn);
+	return ret;
+}
+
+static void mkdir_rdt_prepare_clean(struct rdtgroup *rgrp)
+{
+	kernfs_remove(rgrp->kn);
+	rdtgroup_remove(rgrp);
+}
+
+/*
+ * Create a monitor group under "mon_groups" directory of a control
+ * and monitor group(ctrl_mon). This is a resource group
+ * to monitor a subset of tasks and cpus in its parent ctrl_mon group.
+ */
+static int rdtgroup_mkdir_mon(struct kernfs_node *parent_kn,
+			      const char *name, umode_t mode)
+{
+	struct rdtgroup *rdtgrp, *prgrp;
+	int ret;
+
+	ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTMON_GROUP, &rdtgrp);
+	if (ret)
+		return ret;
+
+	prgrp = rdtgrp->mon.parent;
+	rdtgrp->closid = prgrp->closid;
+
+	ret = mkdir_rdt_prepare_rmid_alloc(rdtgrp);
+	if (ret) {
+		mkdir_rdt_prepare_clean(rdtgrp);
+		goto out_unlock;
+	}
+
+	kernfs_activate(rdtgrp->kn);
+
+	/*
+	 * Add the rdtgrp to the list of rdtgrps the parent
+	 * ctrl_mon group has to track.
+	 */
+	list_add_tail(&rdtgrp->mon.crdtgrp_list, &prgrp->mon.crdtgrp_list);
+
+out_unlock:
+	rdtgroup_kn_unlock(parent_kn);
+	return ret;
+}
+
+/*
+ * These are rdtgroups created under the root directory. Can be used
+ * to allocate and monitor resources.
+ */
+static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn,
+				   const char *name, umode_t mode)
+{
+	struct rdtgroup *rdtgrp;
+	struct kernfs_node *kn;
+	u32 closid;
+	int ret;
+
+	ret = mkdir_rdt_prepare(parent_kn, name, mode, RDTCTRL_GROUP, &rdtgrp);
+	if (ret)
+		return ret;
+
+	kn = rdtgrp->kn;
+	ret = closid_alloc();
+	if (ret < 0) {
+		rdt_last_cmd_puts("Out of CLOSIDs\n");
+		goto out_common_fail;
+	}
+	closid = ret;
+	ret = 0;
+
+	rdtgrp->closid = closid;
+
+	ret = mkdir_rdt_prepare_rmid_alloc(rdtgrp);
+	if (ret)
+		goto out_closid_free;
+
+	kernfs_activate(rdtgrp->kn);
+
+	ret = rdtgroup_init_alloc(rdtgrp);
+	if (ret < 0)
+		goto out_rmid_free;
+
+	list_add(&rdtgrp->rdtgroup_list, &rdt_all_groups);
+
+	if (resctrl_arch_mon_capable()) {
+		/*
+		 * Create an empty mon_groups directory to hold the subset
+		 * of tasks and cpus to monitor.
+		 */
+		ret = mongroup_create_dir(kn, rdtgrp, "mon_groups", NULL);
+		if (ret) {
+			rdt_last_cmd_puts("kernfs subdir error\n");
+			goto out_del_list;
+		}
+		if (is_mba_sc(NULL))
+			rdtgrp->mba_mbps_event = mba_mbps_default_event;
+	}
+
+	goto out_unlock;
+
+out_del_list:
+	list_del(&rdtgrp->rdtgroup_list);
+out_rmid_free:
+	mkdir_rdt_prepare_rmid_free(rdtgrp);
+out_closid_free:
+	closid_free(closid);
+out_common_fail:
+	mkdir_rdt_prepare_clean(rdtgrp);
+out_unlock:
+	rdtgroup_kn_unlock(parent_kn);
+	return ret;
+}
+
+static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name,
+			  umode_t mode)
+{
+	/* Do not accept '\n' to avoid unparsable situation. */
+	if (strchr(name, '\n'))
+		return -EINVAL;
+
+	/*
+	 * If the parent directory is the root directory and RDT
+	 * allocation is supported, add a control and monitoring
+	 * subdirectory
+	 */
+	if (resctrl_arch_alloc_capable() && parent_kn == rdtgroup_default.kn)
+		return rdtgroup_mkdir_ctrl_mon(parent_kn, name, mode);
+
+	/* Else, attempt to add a monitoring subdirectory. */
+	if (resctrl_arch_mon_capable())
+		return rdtgroup_mkdir_mon(parent_kn, name, mode);
+
+	return -EPERM;
+}
+
+static int rdtgroup_rmdir_mon(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
+{
+	struct rdtgroup *prdtgrp = rdtgrp->mon.parent;
+	u32 closid, rmid;
+	int cpu;
+
+	/* Give any tasks back to the parent group */
+	rdt_move_group_tasks(rdtgrp, prdtgrp, tmpmask);
+
+	/*
+	 * Update per cpu closid/rmid of the moved CPUs first.
+	 * Note: the closid will not change, but the arch code still needs it.
+	 */
+	closid = prdtgrp->closid;
+	rmid = prdtgrp->mon.rmid;
+	for_each_cpu(cpu, &rdtgrp->cpu_mask)
+		resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
+
+	/*
+	 * Update the MSR on moved CPUs and CPUs which have moved
+	 * task running on them.
+	 */
+	cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask);
+	update_closid_rmid(tmpmask, NULL);
+
+	rdtgrp->flags = RDT_DELETED;
+	free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+
+	/*
+	 * Remove the rdtgrp from the parent ctrl_mon group's list
+	 */
+	WARN_ON(list_empty(&prdtgrp->mon.crdtgrp_list));
+	list_del(&rdtgrp->mon.crdtgrp_list);
+
+	kernfs_remove(rdtgrp->kn);
+
+	return 0;
+}
+
+static int rdtgroup_ctrl_remove(struct rdtgroup *rdtgrp)
+{
+	rdtgrp->flags = RDT_DELETED;
+	list_del(&rdtgrp->rdtgroup_list);
+
+	kernfs_remove(rdtgrp->kn);
+	return 0;
+}
+
+static int rdtgroup_rmdir_ctrl(struct rdtgroup *rdtgrp, cpumask_var_t tmpmask)
+{
+	u32 closid, rmid;
+	int cpu;
+
+	/* Give any tasks back to the default group */
+	rdt_move_group_tasks(rdtgrp, &rdtgroup_default, tmpmask);
+
+	/* Give any CPUs back to the default group */
+	cpumask_or(&rdtgroup_default.cpu_mask,
+		   &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);
+
+	/* Update per cpu closid and rmid of the moved CPUs first */
+	closid = rdtgroup_default.closid;
+	rmid = rdtgroup_default.mon.rmid;
+	for_each_cpu(cpu, &rdtgrp->cpu_mask)
+		resctrl_arch_set_cpu_default_closid_rmid(cpu, closid, rmid);
+
+	/*
+	 * Update the MSR on moved CPUs and CPUs which have moved
+	 * task running on them.
+	 */
+	cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask);
+	update_closid_rmid(tmpmask, NULL);
+
+	free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
+	closid_free(rdtgrp->closid);
+
+	rdtgroup_ctrl_remove(rdtgrp);
+
+	/*
+	 * Free all the child monitor group rmids.
+	 */
+	free_all_child_rdtgrp(rdtgrp);
+
+	return 0;
+}
+
+static struct kernfs_node *rdt_kn_parent(struct kernfs_node *kn)
+{
+	/*
+	 * Valid within the RCU section it was obtained or while rdtgroup_mutex
+	 * is held.
+	 */
+	return rcu_dereference_check(kn->__parent, lockdep_is_held(&rdtgroup_mutex));
+}
+
+static int rdtgroup_rmdir(struct kernfs_node *kn)
+{
+	struct kernfs_node *parent_kn;
+	struct rdtgroup *rdtgrp;
+	cpumask_var_t tmpmask;
+	int ret = 0;
+
+	if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL))
+		return -ENOMEM;
+
+	rdtgrp = rdtgroup_kn_lock_live(kn);
+	if (!rdtgrp) {
+		ret = -EPERM;
+		goto out;
+	}
+	parent_kn = rdt_kn_parent(kn);
+
+	/*
+	 * If the rdtgroup is a ctrl_mon group and parent directory
+	 * is the root directory, remove the ctrl_mon group.
+	 *
+	 * If the rdtgroup is a mon group and parent directory
+	 * is a valid "mon_groups" directory, remove the mon group.
+	 */
+	if (rdtgrp->type == RDTCTRL_GROUP && parent_kn == rdtgroup_default.kn &&
+	    rdtgrp != &rdtgroup_default) {
+		if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP ||
+		    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+			ret = rdtgroup_ctrl_remove(rdtgrp);
+		} else {
+			ret = rdtgroup_rmdir_ctrl(rdtgrp, tmpmask);
+		}
+	} else if (rdtgrp->type == RDTMON_GROUP &&
+		 is_mon_groups(parent_kn, rdt_kn_name(kn))) {
+		ret = rdtgroup_rmdir_mon(rdtgrp, tmpmask);
+	} else {
+		ret = -EPERM;
+	}
+
+out:
+	rdtgroup_kn_unlock(kn);
+	free_cpumask_var(tmpmask);
+	return ret;
+}
+
+/**
+ * mongrp_reparent() - replace parent CTRL_MON group of a MON group
+ * @rdtgrp:		the MON group whose parent should be replaced
+ * @new_prdtgrp:	replacement parent CTRL_MON group for @rdtgrp
+ * @cpus:		cpumask provided by the caller for use during this call
+ *
+ * Replaces the parent CTRL_MON group for a MON group, resulting in all member
+ * tasks' CLOSID immediately changing to that of the new parent group.
+ * Monitoring data for the group is unaffected by this operation.
+ */
+static void mongrp_reparent(struct rdtgroup *rdtgrp,
+			    struct rdtgroup *new_prdtgrp,
+			    cpumask_var_t cpus)
+{
+	struct rdtgroup *prdtgrp = rdtgrp->mon.parent;
+
+	WARN_ON(rdtgrp->type != RDTMON_GROUP);
+	WARN_ON(new_prdtgrp->type != RDTCTRL_GROUP);
+
+	/* Nothing to do when simply renaming a MON group. */
+	if (prdtgrp == new_prdtgrp)
+		return;
+
+	WARN_ON(list_empty(&prdtgrp->mon.crdtgrp_list));
+	list_move_tail(&rdtgrp->mon.crdtgrp_list,
+		       &new_prdtgrp->mon.crdtgrp_list);
+
+	rdtgrp->mon.parent = new_prdtgrp;
+	rdtgrp->closid = new_prdtgrp->closid;
+
+	/* Propagate updated closid to all tasks in this group. */
+	rdt_move_group_tasks(rdtgrp, rdtgrp, cpus);
+
+	update_closid_rmid(cpus, NULL);
+}
+
+static int rdtgroup_rename(struct kernfs_node *kn,
+			   struct kernfs_node *new_parent, const char *new_name)
+{
+	struct kernfs_node *kn_parent;
+	struct rdtgroup *new_prdtgrp;
+	struct rdtgroup *rdtgrp;
+	cpumask_var_t tmpmask;
+	int ret;
+
+	rdtgrp = kernfs_to_rdtgroup(kn);
+	new_prdtgrp = kernfs_to_rdtgroup(new_parent);
+	if (!rdtgrp || !new_prdtgrp)
+		return -ENOENT;
+
+	/* Release both kernfs active_refs before obtaining rdtgroup mutex. */
+	rdtgroup_kn_get(rdtgrp, kn);
+	rdtgroup_kn_get(new_prdtgrp, new_parent);
+
+	mutex_lock(&rdtgroup_mutex);
+
+	rdt_last_cmd_clear();
+
+	/*
+	 * Don't allow kernfs_to_rdtgroup() to return a parent rdtgroup if
+	 * either kernfs_node is a file.
+	 */
+	if (kernfs_type(kn) != KERNFS_DIR ||
+	    kernfs_type(new_parent) != KERNFS_DIR) {
+		rdt_last_cmd_puts("Source and destination must be directories");
+		ret = -EPERM;
+		goto out;
+	}
+
+	if ((rdtgrp->flags & RDT_DELETED) || (new_prdtgrp->flags & RDT_DELETED)) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	kn_parent = rdt_kn_parent(kn);
+	if (rdtgrp->type != RDTMON_GROUP || !kn_parent ||
+	    !is_mon_groups(kn_parent, rdt_kn_name(kn))) {
+		rdt_last_cmd_puts("Source must be a MON group\n");
+		ret = -EPERM;
+		goto out;
+	}
+
+	if (!is_mon_groups(new_parent, new_name)) {
+		rdt_last_cmd_puts("Destination must be a mon_groups subdirectory\n");
+		ret = -EPERM;
+		goto out;
+	}
+
+	/*
+	 * If the MON group is monitoring CPUs, the CPUs must be assigned to the
+	 * current parent CTRL_MON group and therefore cannot be assigned to
+	 * the new parent, making the move illegal.
+	 */
+	if (!cpumask_empty(&rdtgrp->cpu_mask) &&
+	    rdtgrp->mon.parent != new_prdtgrp) {
+		rdt_last_cmd_puts("Cannot move a MON group that monitors CPUs\n");
+		ret = -EPERM;
+		goto out;
+	}
+
+	/*
+	 * Allocate the cpumask for use in mongrp_reparent() to avoid the
+	 * possibility of failing to allocate it after kernfs_rename() has
+	 * succeeded.
+	 */
+	if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL)) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	/*
+	 * Perform all input validation and allocations needed to ensure
+	 * mongrp_reparent() will succeed before calling kernfs_rename(),
+	 * otherwise it would be necessary to revert this call if
+	 * mongrp_reparent() failed.
+	 */
+	ret = kernfs_rename(kn, new_parent, new_name);
+	if (!ret)
+		mongrp_reparent(rdtgrp, new_prdtgrp, tmpmask);
+
+	free_cpumask_var(tmpmask);
+
+out:
+	mutex_unlock(&rdtgroup_mutex);
+	rdtgroup_kn_put(rdtgrp, kn);
+	rdtgroup_kn_put(new_prdtgrp, new_parent);
+	return ret;
+}
+
+static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
+{
+	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L3))
+		seq_puts(seq, ",cdp");
+
+	if (resctrl_arch_get_cdp_enabled(RDT_RESOURCE_L2))
+		seq_puts(seq, ",cdpl2");
+
+	if (is_mba_sc(resctrl_arch_get_resource(RDT_RESOURCE_MBA)))
+		seq_puts(seq, ",mba_MBps");
+
+	if (resctrl_debug)
+		seq_puts(seq, ",debug");
+
+	return 0;
+}
+
+static struct kernfs_syscall_ops rdtgroup_kf_syscall_ops = {
+	.mkdir		= rdtgroup_mkdir,
+	.rmdir		= rdtgroup_rmdir,
+	.rename		= rdtgroup_rename,
+	.show_options	= rdtgroup_show_options,
+};
+
+static int rdtgroup_setup_root(struct rdt_fs_context *ctx)
+{
+	rdt_root = kernfs_create_root(&rdtgroup_kf_syscall_ops,
+				      KERNFS_ROOT_CREATE_DEACTIVATED |
+				      KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK,
+				      &rdtgroup_default);
+	if (IS_ERR(rdt_root))
+		return PTR_ERR(rdt_root);
+
+	ctx->kfc.root = rdt_root;
+	rdtgroup_default.kn = kernfs_root_to_node(rdt_root);
+
+	return 0;
+}
+
+static void rdtgroup_destroy_root(void)
+{
+	lockdep_assert_held(&rdtgroup_mutex);
+
+	kernfs_destroy_root(rdt_root);
+	rdtgroup_default.kn = NULL;
+}
+
+static void rdtgroup_setup_default(void)
+{
+	mutex_lock(&rdtgroup_mutex);
+
+	rdtgroup_default.closid = RESCTRL_RESERVED_CLOSID;
+	rdtgroup_default.mon.rmid = RESCTRL_RESERVED_RMID;
+	rdtgroup_default.type = RDTCTRL_GROUP;
+	INIT_LIST_HEAD(&rdtgroup_default.mon.crdtgrp_list);
+
+	list_add(&rdtgroup_default.rdtgroup_list, &rdt_all_groups);
+
+	mutex_unlock(&rdtgroup_mutex);
+}
+
+static void domain_destroy_mon_state(struct rdt_mon_domain *d)
+{
+	bitmap_free(d->rmid_busy_llc);
+	kfree(d->mbm_total);
+	kfree(d->mbm_local);
+}
+
+void resctrl_offline_ctrl_domain(struct rdt_resource *r, struct rdt_ctrl_domain *d)
+{
+	mutex_lock(&rdtgroup_mutex);
+
+	if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA)
+		mba_sc_domain_destroy(r, d);
+
+	mutex_unlock(&rdtgroup_mutex);
+}
+
+void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d)
+{
+	mutex_lock(&rdtgroup_mutex);
+
+	/*
+	 * If resctrl is mounted, remove all the
+	 * per domain monitor data directories.
+	 */
+	if (resctrl_mounted && resctrl_arch_mon_capable())
+		rmdir_mondata_subdir_allrdtgrp(r, d);
+
+	if (resctrl_is_mbm_enabled())
+		cancel_delayed_work(&d->mbm_over);
+	if (resctrl_arch_is_llc_occupancy_enabled() && has_busy_rmid(d)) {
+		/*
+		 * When a package is going down, forcefully
+		 * decrement rmid->ebusy. There is no way to know
+		 * that the L3 was flushed and hence may lead to
+		 * incorrect counts in rare scenarios, but leaving
+		 * the RMID as busy creates RMID leaks if the
+		 * package never comes back.
+		 */
+		__check_limbo(d, true);
+		cancel_delayed_work(&d->cqm_limbo);
+	}
+
+	domain_destroy_mon_state(d);
+
+	mutex_unlock(&rdtgroup_mutex);
+}
+
+/**
+ * domain_setup_mon_state() -  Initialise domain monitoring structures.
+ * @r:	The resource for the newly online domain.
+ * @d:	The newly online domain.
+ *
+ * Allocate monitor resources that belong to this domain.
+ * Called when the first CPU of a domain comes online, regardless of whether
+ * the filesystem is mounted.
+ * During boot this may be called before global allocations have been made by
+ * resctrl_mon_resource_init().
+ *
+ * Returns 0 for success, or -ENOMEM.
+ */
+static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_mon_domain *d)
+{
+	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
+	size_t tsize;
+
+	if (resctrl_arch_is_llc_occupancy_enabled()) {
+		d->rmid_busy_llc = bitmap_zalloc(idx_limit, GFP_KERNEL);
+		if (!d->rmid_busy_llc)
+			return -ENOMEM;
+	}
+	if (resctrl_arch_is_mbm_total_enabled()) {
+		tsize = sizeof(*d->mbm_total);
+		d->mbm_total = kcalloc(idx_limit, tsize, GFP_KERNEL);
+		if (!d->mbm_total) {
+			bitmap_free(d->rmid_busy_llc);
+			return -ENOMEM;
+		}
+	}
+	if (resctrl_arch_is_mbm_local_enabled()) {
+		tsize = sizeof(*d->mbm_local);
+		d->mbm_local = kcalloc(idx_limit, tsize, GFP_KERNEL);
+		if (!d->mbm_local) {
+			bitmap_free(d->rmid_busy_llc);
+			kfree(d->mbm_total);
+			return -ENOMEM;
+		}
+	}
+
+	return 0;
+}
+
+int resctrl_online_ctrl_domain(struct rdt_resource *r, struct rdt_ctrl_domain *d)
+{
+	int err = 0;
+
+	mutex_lock(&rdtgroup_mutex);
+
+	if (supports_mba_mbps() && r->rid == RDT_RESOURCE_MBA) {
+		/* RDT_RESOURCE_MBA is never mon_capable */
+		err = mba_sc_domain_allocate(r, d);
+	}
+
+	mutex_unlock(&rdtgroup_mutex);
+
+	return err;
+}
+
+int resctrl_online_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d)
+{
+	int err;
+
+	mutex_lock(&rdtgroup_mutex);
+
+	err = domain_setup_mon_state(r, d);
+	if (err)
+		goto out_unlock;
+
+	if (resctrl_is_mbm_enabled()) {
+		INIT_DELAYED_WORK(&d->mbm_over, mbm_handle_overflow);
+		mbm_setup_overflow_handler(d, MBM_OVERFLOW_INTERVAL,
+					   RESCTRL_PICK_ANY_CPU);
+	}
+
+	if (resctrl_arch_is_llc_occupancy_enabled())
+		INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo);
+
+	/*
+	 * If the filesystem is not mounted then only the default resource group
+	 * exists. Creation of its directories is deferred until mount time
+	 * by rdt_get_tree() calling mkdir_mondata_all().
+	 * If resctrl is mounted, add per domain monitor data directories.
+	 */
+	if (resctrl_mounted && resctrl_arch_mon_capable())
+		mkdir_mondata_subdir_allrdtgrp(r, d);
+
+out_unlock:
+	mutex_unlock(&rdtgroup_mutex);
+
+	return err;
+}
+
+void resctrl_online_cpu(unsigned int cpu)
+{
+	mutex_lock(&rdtgroup_mutex);
+	/* The CPU is set in default rdtgroup after online. */
+	cpumask_set_cpu(cpu, &rdtgroup_default.cpu_mask);
+	mutex_unlock(&rdtgroup_mutex);
+}
+
+static void clear_childcpus(struct rdtgroup *r, unsigned int cpu)
+{
+	struct rdtgroup *cr;
+
+	list_for_each_entry(cr, &r->mon.crdtgrp_list, mon.crdtgrp_list) {
+		if (cpumask_test_and_clear_cpu(cpu, &cr->cpu_mask))
+			break;
+	}
+}
+
+static struct rdt_mon_domain *get_mon_domain_from_cpu(int cpu,
+						      struct rdt_resource *r)
+{
+	struct rdt_mon_domain *d;
+
+	lockdep_assert_cpus_held();
+
+	list_for_each_entry(d, &r->mon_domains, hdr.list) {
+		/* Find the domain that contains this CPU */
+		if (cpumask_test_cpu(cpu, &d->hdr.cpu_mask))
+			return d;
+	}
+
+	return NULL;
+}
+
+void resctrl_offline_cpu(unsigned int cpu)
+{
+	struct rdt_resource *l3 = resctrl_arch_get_resource(RDT_RESOURCE_L3);
+	struct rdt_mon_domain *d;
+	struct rdtgroup *rdtgrp;
+
+	mutex_lock(&rdtgroup_mutex);
+	list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) {
+		if (cpumask_test_and_clear_cpu(cpu, &rdtgrp->cpu_mask)) {
+			clear_childcpus(rdtgrp, cpu);
+			break;
+		}
+	}
+
+	if (!l3->mon_capable)
+		goto out_unlock;
+
+	d = get_mon_domain_from_cpu(cpu, l3);
+	if (d) {
+		if (resctrl_is_mbm_enabled() && cpu == d->mbm_work_cpu) {
+			cancel_delayed_work(&d->mbm_over);
+			mbm_setup_overflow_handler(d, 0, cpu);
+		}
+		if (resctrl_arch_is_llc_occupancy_enabled() &&
+		    cpu == d->cqm_work_cpu && has_busy_rmid(d)) {
+			cancel_delayed_work(&d->cqm_limbo);
+			cqm_setup_limbo_handler(d, 0, cpu);
+		}
+	}
+
+out_unlock:
+	mutex_unlock(&rdtgroup_mutex);
+}
+
+/*
+ * resctrl_init - resctrl filesystem initialization
+ *
+ * Setup resctrl file system including set up root, create mount point,
+ * register resctrl filesystem, and initialize files under root directory.
+ *
+ * Return: 0 on success or -errno
+ */
+int resctrl_init(void)
+{
+	int ret = 0;
+
+	seq_buf_init(&last_cmd_status, last_cmd_status_buf,
+		     sizeof(last_cmd_status_buf));
+
+	rdtgroup_setup_default();
+
+	thread_throttle_mode_init();
+
+	ret = resctrl_mon_resource_init();
+	if (ret)
+		return ret;
+
+	ret = sysfs_create_mount_point(fs_kobj, "resctrl");
+	if (ret) {
+		resctrl_mon_resource_exit();
+		return ret;
+	}
+
+	ret = register_filesystem(&rdt_fs_type);
+	if (ret)
+		goto cleanup_mountpoint;
+
+	/*
+	 * Adding the resctrl debugfs directory here may not be ideal since
+	 * it would let the resctrl debugfs directory appear on the debugfs
+	 * filesystem before the resctrl filesystem is mounted.
+	 * It may also be ok since that would enable debugging of RDT before
+	 * resctrl is mounted.
+	 * The reason why the debugfs directory is created here and not in
+	 * rdt_get_tree() is because rdt_get_tree() takes rdtgroup_mutex and
+	 * during the debugfs directory creation also &sb->s_type->i_mutex_key
+	 * (the lockdep class of inode->i_rwsem). Other filesystem
+	 * interactions (eg. SyS_getdents) have the lock ordering:
+	 * &sb->s_type->i_mutex_key --> &mm->mmap_lock
+	 * During mmap(), called with &mm->mmap_lock, the rdtgroup_mutex
+	 * is taken, thus creating dependency:
+	 * &mm->mmap_lock --> rdtgroup_mutex for the latter that can cause
+	 * issues considering the other two lock dependencies.
+	 * By creating the debugfs directory here we avoid a dependency
+	 * that may cause deadlock (even though file operations cannot
+	 * occur until the filesystem is mounted, but I do not know how to
+	 * tell lockdep that).
+	 */
+	debugfs_resctrl = debugfs_create_dir("resctrl", NULL);
+
+	return 0;
+
+cleanup_mountpoint:
+	sysfs_remove_mount_point(fs_kobj, "resctrl");
+	resctrl_mon_resource_exit();
+
+	return ret;
+}
+
+static bool resctrl_online_domains_exist(void)
+{
+	struct rdt_resource *r;
+
+	/*
+	 * Only walk capable resources to allow resctrl_arch_get_resource()
+	 * to return dummy 'not capable' resources.
+	 */
+	for_each_alloc_capable_rdt_resource(r) {
+		if (!list_empty(&r->ctrl_domains))
+			return true;
+	}
+
+	for_each_mon_capable_rdt_resource(r) {
+		if (!list_empty(&r->mon_domains))
+			return true;
+	}
+
+	return false;
+}
+
+/**
+ * resctrl_exit() - Remove the resctrl filesystem and free resources.
+ *
+ * Called by the architecture code in response to a fatal error.
+ * Removes resctrl files and structures from kernfs to prevent further
+ * configuration.
+ *
+ * When called by the architecture code, all CPUs and resctrl domains must be
+ * offline. This ensures the limbo and overflow handlers are not scheduled to
+ * run, meaning the data structures they access can be freed by
+ * resctrl_mon_resource_exit().
+ *
+ * After resctrl_exit() returns, the architecture code should return an
+ * error from all resctrl_arch_ functions that can do this.
+ * resctrl_arch_get_resource() must continue to return struct rdt_resources
+ * with the correct rid field to ensure the filesystem can be unmounted.
+ */
+void resctrl_exit(void)
+{
+	cpus_read_lock();
+	WARN_ON_ONCE(resctrl_online_domains_exist());
+
+	mutex_lock(&rdtgroup_mutex);
+	resctrl_fs_teardown();
+	mutex_unlock(&rdtgroup_mutex);
+
+	cpus_read_unlock();
+
+	debugfs_remove_recursive(debugfs_resctrl);
+	debugfs_resctrl = NULL;
+	unregister_filesystem(&rdt_fs_type);
+
+	/*
+	 * Do not remove the sysfs mount point added by resctrl_init() so that
+	 * it can be used to umount resctrl.
+	 */
+
+	resctrl_mon_resource_exit();
+}
-- 
Gitee


From 49d9692cf18c93faa2d9833a14abad927ee2e419 Mon Sep 17 00:00:00 2001
From: James Morse <james.morse@arm.com>
Date: Thu, 15 May 2025 16:58:55 +0000
Subject: [PATCH 273/280] MAINTAINERS: Add reviewers for fs/resctrl

ANBZ: #31045

commit 54d14f25664bbb75c2928dd0d64a095c0f488176 upstream.

resctrl has existed for quite a while as a filesystem interface private to
arch/x86. To allow other architectures to support the same user interface
for similar hardware features, it has been moved to /fs/.

Add those with a vested interest in the common code as reviewers.

Intel-SIG: commit 54d14f25664b MAINTAINERS: Add reviewers for fs/resctrl
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Reinette Chatre <reinette.chatre@intel.com>
Acked-by: Dave Martin <Dave.Martin@arm.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-26-james.morse@arm.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 MAINTAINERS | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index e0622acf338d..019464f29333 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18199,6 +18199,8 @@ F:	net/rds/
 RDT - RESOURCE ALLOCATION
 M:	Fenghua Yu <fenghua.yu@intel.com>
 M:	Reinette Chatre <reinette.chatre@intel.com>
+R:	Dave Martin <Dave.Martin@arm.com>
+R:	James Morse <james.morse@arm.com>
 L:	linux-kernel@vger.kernel.org
 S:	Supported
 F:	Documentation/filesystems/resctrl.rst
-- 
Gitee


From 49031195a59a930c4f07c56204469dbceba23697 Mon Sep 17 00:00:00 2001
From: Zeng Heng <zengheng4@huawei.com>
Date: Tue, 3 Jun 2025 20:58:28 +0800
Subject: [PATCH 274/280] fs/resctrl: Restore the rdt_last_cmd_clear() calls
 after acquiring rdtgroup_mutex

ANBZ: #31045

commit dd2922dcfaa3296846265e113309e5f7f138839f upstream.

A lockdep fix removed two rdt_last_cmd_clear() calls that were used to
clear the last_cmd_status buffer but called without holding the required
rdtgroup_mutex.

The impacted resctrl commands are writing to the cpus or cpus_list files
and creating a new monitor or control group. With stale data in the
last_cmd_status buffer the impacted resctrl commands report the stale error
on success, or append its own failure message to the stale error on
failure.

Consequently, restore the rdt_last_cmd_clear() calls after acquiring
rdtgroup_mutex.

Intel-SIG: commit dd2922dcfaa3 fs/resctrl: Restore the rdt_last_cmd_clear() calls after acquiring rdtgroup_mutex
Backport Resctrl/RDT-SNC for Intel platforms

Fixes: c8eafe149530 ("x86/resctrl: Fix potential lockdep warning")
Signed-off-by: Zeng Heng <zengheng4@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/all/20250603125828.1590067-1-zengheng4@huawei.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/rdtgroup.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index cc37f58b47dd..1beb124e25f6 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -536,6 +536,8 @@ static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of,
 		goto unlock;
 	}
 
+	rdt_last_cmd_clear();
+
 	if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED ||
 	    rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
 		ret = -EINVAL;
@@ -3472,6 +3474,8 @@ static int mkdir_rdt_prepare(struct kernfs_node *parent_kn,
 		goto out_unlock;
 	}
 
+	rdt_last_cmd_clear();
+
 	/*
 	 * Check that the parent directory for a monitor group is a "mon_groups"
 	 * directory.
-- 
Gitee


From f3d7f6f0d90f30b72b706976c997677419466b0c Mon Sep 17 00:00:00 2001
From: Qinyun Tan <qinyuntan@linux.alibaba.com>
Date: Sat, 31 May 2025 02:20:53 +0800
Subject: [PATCH 275/280] x86,fs/resctrl: Remove inappropriate references to
 cacheinfo in the resctrl subsystem

ANBZ: #31045

commit 594902c986e269660302f09df9ec4bf1cf017b77 upstream.

In the resctrl subsystem's Sub-NUMA Cluster (SNC) mode, the rdt_mon_domain
structure representing a NUMA node relies on the cacheinfo interface
(rdt_mon_domain::ci) to store L3 cache information (e.g., shared_cpu_map)
for monitoring. The L3 cache information of a SNC NUMA node determines
which domains are summed for the "top level" L3-scoped events.

rdt_mon_domain::ci is initialized using the first online CPU of a NUMA
node. When this CPU goes offline, its shared_cpu_map is cleared to contain
only the offline CPU itself. Subsequently, attempting to read counters
via smp_call_on_cpu(offline_cpu) fails (and error ignored), returning
zero values for "top-level events" without any error indication.

Replace the cacheinfo references in struct rdt_mon_domain and struct
rmid_read with the cacheinfo ID (a unique identifier for the L3 cache).

rdt_domain_hdr::cpu_mask contains the online CPUs associated with that
domain. When reading "top-level events", select a CPU from
rdt_domain_hdr::cpu_mask and utilize its L3 shared_cpu_map to determine
valid CPUs for reading RMID counter via the MSR interface.

Considering all CPUs associated with the L3 cache improves the chances
of picking a housekeeping CPU on which the counter reading work can be
queued, avoiding an unnecessary IPI.

Intel-SIG: commit 594902c986e2 x86,fs/resctrl: Remove inappropriate references to cacheinfo in the resctrl subsystem
Backport Resctrl/RDT-SNC for Intel platforms

Fixes: 328ea68874642 ("x86/resctrl: Prepare for new Sub-NUMA Cluster (SNC) monitor files")
Signed-off-by: Qinyun Tan <qinyuntan@linux.alibaba.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250530182053.37502-2-qinyuntan@linux.alibaba.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/core.c |  6 ++++--
 fs/resctrl/ctrlmondata.c           | 13 +++++++++----
 fs/resctrl/internal.h              |  4 ++--
 fs/resctrl/monitor.c               |  6 ++++--
 fs/resctrl/rdtgroup.c              |  6 +++---
 include/linux/resctrl.h            |  4 ++--
 6 files changed, 24 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 224bed28f341..548390bfde3a 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -497,6 +497,7 @@ static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
 	struct rdt_hw_mon_domain *hw_dom;
 	struct rdt_domain_hdr *hdr;
 	struct rdt_mon_domain *d;
+	struct cacheinfo *ci;
 	int err;
 
 	lockdep_assert_held(&domain_list_lock);
@@ -524,12 +525,13 @@ static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
 	d = &hw_dom->d_resctrl;
 	d->hdr.id = id;
 	d->hdr.type = RESCTRL_MON_DOMAIN;
-	d->ci = get_cpu_cacheinfo_level(cpu, RESCTRL_L3_CACHE);
-	if (!d->ci) {
+	ci = get_cpu_cacheinfo_level(cpu, RESCTRL_L3_CACHE);
+	if (!ci) {
 		pr_warn_once("Can't find L3 cache for CPU:%d resource %s\n", cpu, r->name);
 		mon_domain_free(hw_dom);
 		return;
 	}
+	d->ci_id = ci->id;
 	cpumask_set_cpu(cpu, &d->hdr.cpu_mask);
 
 	arch_mon_domain_online(r, d);
diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index 6ed2dfd4dbbd..d98e0d2de09f 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -594,9 +594,10 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 	struct rmid_read rr = {0};
 	struct rdt_mon_domain *d;
 	struct rdtgroup *rdtgrp;
+	int domid, cpu, ret = 0;
 	struct rdt_resource *r;
+	struct cacheinfo *ci;
 	struct mon_data *md;
-	int domid, ret = 0;
 
 	rdtgrp = rdtgroup_kn_lock_live(of->kn);
 	if (!rdtgrp) {
@@ -623,10 +624,14 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 		 * one that matches this cache id.
 		 */
 		list_for_each_entry(d, &r->mon_domains, hdr.list) {
-			if (d->ci->id == domid) {
-				rr.ci = d->ci;
+			if (d->ci_id == domid) {
+				rr.ci_id = d->ci_id;
+				cpu = cpumask_any(&d->hdr.cpu_mask);
+				ci = get_cpu_cacheinfo_level(cpu, RESCTRL_L3_CACHE);
+				if (!ci)
+					continue;
 				mon_event_read(&rr, r, NULL, rdtgrp,
-					       &d->ci->shared_cpu_map, evtid, false);
+					       &ci->shared_cpu_map, evtid, false);
 				goto checkresult;
 			}
 		}
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index 9a8cf6f11151..0a1eedba2b03 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -98,7 +98,7 @@ struct mon_data {
  *	   domains in @r sharing L3 @ci.id
  * @evtid: Which monitor event to read.
  * @first: Initialize MBM counter when true.
- * @ci:    Cacheinfo for L3. Only set when @d is NULL. Used when summing domains.
+ * @ci_id: Cacheinfo id for L3. Only set when @d is NULL. Used when summing domains.
  * @err:   Error encountered when reading counter.
  * @val:   Returned value of event counter. If @rgrp is a parent resource group,
  *	   @val includes the sum of event counts from its child resource groups.
@@ -112,7 +112,7 @@ struct rmid_read {
 	struct rdt_mon_domain	*d;
 	enum resctrl_event_id	evtid;
 	bool			first;
-	struct cacheinfo	*ci;
+	unsigned int		ci_id;
 	int			err;
 	u64			val;
 	void			*arch_mon_ctx;
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index bde2801289d3..f5637855c3ac 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -361,6 +361,7 @@ static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
 {
 	int cpu = smp_processor_id();
 	struct rdt_mon_domain *d;
+	struct cacheinfo *ci;
 	struct mbm_state *m;
 	int err, ret;
 	u64 tval = 0;
@@ -388,7 +389,8 @@ static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
 	}
 
 	/* Summing domains that share a cache, must be on a CPU for that cache. */
-	if (!cpumask_test_cpu(cpu, &rr->ci->shared_cpu_map))
+	ci = get_cpu_cacheinfo_level(cpu, RESCTRL_L3_CACHE);
+	if (!ci || ci->id != rr->ci_id)
 		return -EINVAL;
 
 	/*
@@ -400,7 +402,7 @@ static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
 	 */
 	ret = -EINVAL;
 	list_for_each_entry(d, &rr->r->mon_domains, hdr.list) {
-		if (d->ci->id != rr->ci->id)
+		if (d->ci_id != rr->ci_id)
 			continue;
 		err = resctrl_arch_rmid_read(rr->r, d, closid, rmid,
 					     rr->evtid, &tval, rr->arch_mon_ctx);
diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 1beb124e25f6..77d08229d855 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -3036,7 +3036,7 @@ static void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r,
 	char name[32];
 
 	snc_mode = r->mon_scope == RESCTRL_L3_NODE;
-	sprintf(name, "mon_%s_%02d", r->name, snc_mode ? d->ci->id : d->hdr.id);
+	sprintf(name, "mon_%s_%02d", r->name, snc_mode ? d->ci_id : d->hdr.id);
 	if (snc_mode)
 		sprintf(subname, "mon_sub_%s_%02d", r->name, d->hdr.id);
 
@@ -3061,7 +3061,7 @@ static int mon_add_all_files(struct kernfs_node *kn, struct rdt_mon_domain *d,
 		return -EPERM;
 
 	list_for_each_entry(mevt, &r->evt_list, list) {
-		domid = do_sum ? d->ci->id : d->hdr.id;
+		domid = do_sum ? d->ci_id : d->hdr.id;
 		priv = mon_get_kn_priv(r->rid, domid, mevt, do_sum);
 		if (WARN_ON_ONCE(!priv))
 			return -EINVAL;
@@ -3089,7 +3089,7 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
 	lockdep_assert_held(&rdtgroup_mutex);
 
 	snc_mode = r->mon_scope == RESCTRL_L3_NODE;
-	sprintf(name, "mon_%s_%02d", r->name, snc_mode ? d->ci->id : d->hdr.id);
+	sprintf(name, "mon_%s_%02d", r->name, snc_mode ? d->ci_id : d->hdr.id);
 	kn = kernfs_find_and_get(parent_kn, name);
 	if (kn) {
 		/*
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 9ba771f2ddea..6fb4894b8cfd 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -159,7 +159,7 @@ struct rdt_ctrl_domain {
 /**
  * struct rdt_mon_domain - group of CPUs sharing a resctrl monitor resource
  * @hdr:		common header for different domain types
- * @ci:			cache info for this domain
+ * @ci_id:		cache info id for this domain
  * @rmid_busy_llc:	bitmap of which limbo RMIDs are above threshold
  * @mbm_total:		saved state for MBM total bandwidth
  * @mbm_local:		saved state for MBM local bandwidth
@@ -170,7 +170,7 @@ struct rdt_ctrl_domain {
  */
 struct rdt_mon_domain {
 	struct rdt_domain_hdr		hdr;
-	struct cacheinfo		*ci;
+	unsigned int			ci_id;
 	unsigned long			*rmid_busy_llc;
 	struct mbm_state		*mbm_total;
 	struct mbm_state		*mbm_local;
-- 
Gitee


From d09bb3be6f38b59ac1e668622875f1a0a22e1b56 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 2 Jul 2025 22:16:50 +0100
Subject: [PATCH 276/280] resctrl: get rid of pointless
 debugfs_file_{get,put}()

ANBZ: #31045

commit 460e36ee6f84c2df4d194ee788e3ca116e8c563b upstream.

->write() of file_operations that gets used only via debugfs_create_file()
is called only under debugfs_file_get()

Intel-SIG: commit 460e36ee6f84 resctrl: get rid of pointless debugfs_file_{get,put}()
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20250702211650.GD3406663@ZenIV
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/pseudo_lock.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/fs/resctrl/pseudo_lock.c b/fs/resctrl/pseudo_lock.c
index 5bbeb8416fa6..6a358fc7124d 100644
--- a/fs/resctrl/pseudo_lock.c
+++ b/fs/resctrl/pseudo_lock.c
@@ -764,13 +764,9 @@ static ssize_t pseudo_lock_measure_trigger(struct file *file,
 	if (ret == 0) {
 		if (sel != 1 && sel != 2 && sel != 3)
 			return -EINVAL;
-		ret = debugfs_file_get(file->f_path.dentry);
-		if (ret)
-			return ret;
 		ret = pseudo_lock_measure_cycles(rdtgrp, sel);
 		if (ret == 0)
 			ret = count;
-		debugfs_file_put(file->f_path.dentry);
 	}
 
 	return ret;
-- 
Gitee


From d5de2c559016247527999c30a8f000d190f69d89 Mon Sep 17 00:00:00 2001
From: Reinette Chatre <reinette.chatre@intel.com>
Date: Mon, 8 Sep 2025 15:15:51 -0700
Subject: [PATCH 277/280] fs/resctrl: Eliminate false positive lockdep warning
 when reading SNC counters

ANBZ: #31045

commit d2e1b84c5141ff2ad465279acfc3cf943c960b78 upstream.

Running resctrl_tests on an SNC-2 system with lockdep debugging enabled
triggers several warnings with following trace:

  WARNING: CPU: 0 PID: 1914 at kernel/cpu.c:528 lockdep_assert_cpus_held
  ...
  Call Trace:
  __mon_event_count
  ? __lock_acquire
  ? __pfx___mon_event_count
  mon_event_count
  ? __pfx_smp_mon_event_count
  smp_mon_event_count
  smp_call_on_cpu_callback

get_cpu_cacheinfo_level() called from __mon_event_count() requires CPU hotplug
lock to be held. The hotplug lock is indeed held during this time, as
confirmed by the lockdep_assert_cpus_held() within mon_event_read() that calls
mon_event_count() via IPI, but the lockdep tracking is not able to follow the
IPI.

Fresh CPU cache information via get_cpu_cacheinfo_level() from
__mon_event_count() was added to support the fix for the issue where resctrl
inappropriately maintained links to L3 cache information that will be stale in
the case when the associated CPU goes offline.

Keep the cacheinfo ID in struct rdt_mon_domain to ensure that resctrl does not
maintain stale cache information while CPUs can go offline. Return to using
a pointer to the L3 cache information (struct cacheinfo) in struct rmid_read,
rmid_read::ci. Initialize rmid_read::ci before the IPI where it is used. CPU
hotplug lock is held across rmid_read::ci initialization and use to ensure
that it points to accurate cache information.

Intel-SIG: commit d2e1b84c5141 fs/resctrl: Eliminate false positive lockdep warning when reading SNC counters
Backport Resctrl/RDT-SNC for Intel platforms

Fixes: 594902c986e2 ("x86,fs/resctrl: Remove inappropriate references to cacheinfo in the resctrl subsystem")
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/ctrlmondata.c | 2 +-
 fs/resctrl/internal.h    | 4 ++--
 fs/resctrl/monitor.c     | 6 ++----
 3 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c
index d98e0d2de09f..3c39cfacb251 100644
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -625,11 +625,11 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
 		 */
 		list_for_each_entry(d, &r->mon_domains, hdr.list) {
 			if (d->ci_id == domid) {
-				rr.ci_id = d->ci_id;
 				cpu = cpumask_any(&d->hdr.cpu_mask);
 				ci = get_cpu_cacheinfo_level(cpu, RESCTRL_L3_CACHE);
 				if (!ci)
 					continue;
+				rr.ci = ci;
 				mon_event_read(&rr, r, NULL, rdtgrp,
 					       &ci->shared_cpu_map, evtid, false);
 				goto checkresult;
diff --git a/fs/resctrl/internal.h b/fs/resctrl/internal.h
index 0a1eedba2b03..9a8cf6f11151 100644
--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -98,7 +98,7 @@ struct mon_data {
  *	   domains in @r sharing L3 @ci.id
  * @evtid: Which monitor event to read.
  * @first: Initialize MBM counter when true.
- * @ci_id: Cacheinfo id for L3. Only set when @d is NULL. Used when summing domains.
+ * @ci:    Cacheinfo for L3. Only set when @d is NULL. Used when summing domains.
  * @err:   Error encountered when reading counter.
  * @val:   Returned value of event counter. If @rgrp is a parent resource group,
  *	   @val includes the sum of event counts from its child resource groups.
@@ -112,7 +112,7 @@ struct rmid_read {
 	struct rdt_mon_domain	*d;
 	enum resctrl_event_id	evtid;
 	bool			first;
-	unsigned int		ci_id;
+	struct cacheinfo	*ci;
 	int			err;
 	u64			val;
 	void			*arch_mon_ctx;
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index f5637855c3ac..7326c28a7908 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -361,7 +361,6 @@ static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
 {
 	int cpu = smp_processor_id();
 	struct rdt_mon_domain *d;
-	struct cacheinfo *ci;
 	struct mbm_state *m;
 	int err, ret;
 	u64 tval = 0;
@@ -389,8 +388,7 @@ static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
 	}
 
 	/* Summing domains that share a cache, must be on a CPU for that cache. */
-	ci = get_cpu_cacheinfo_level(cpu, RESCTRL_L3_CACHE);
-	if (!ci || ci->id != rr->ci_id)
+	if (!cpumask_test_cpu(cpu, &rr->ci->shared_cpu_map))
 		return -EINVAL;
 
 	/*
@@ -402,7 +400,7 @@ static int __mon_event_count(u32 closid, u32 rmid, struct rmid_read *rr)
 	 */
 	ret = -EINVAL;
 	list_for_each_entry(d, &rr->r->mon_domains, hdr.list) {
-		if (d->ci_id != rr->ci_id)
+		if (d->ci_id != rr->ci->id)
 			continue;
 		err = resctrl_arch_rmid_read(rr->r, d, closid, rmid,
 					     rr->evtid, &tval, rr->arch_mon_ctx);
-- 
Gitee


From 8aa240fe1b3289e6d5849a0ee3d226ea6ee3299a Mon Sep 17 00:00:00 2001
From: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Date: Mon, 23 Jun 2025 16:50:50 +0900
Subject: [PATCH 278/280] fs/resctrl: Optimize code in rdt_get_tree()

ANBZ: #31045

commit 0e58f6a7dd689c73d67e6a2164b46d4618f2698a upstream.

schemata_list_destroy() has to be called if schemata_list_create() fails.

rdt_get_tree() calls schemata_list_destroy() in two different ways:
directly if schemata_list_create() itself fails and
on the exit path via the out_schemata_free goto label.

Remove schemata_list_destroy() call on schemata_list_create() failure.
Use existing out_schemata_free goto label instead.

Intel-SIG: commit 0e58f6a7dd68 fs/resctrl: Optimize code in rdt_get_tree()
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Koba Ko <kobak@nvidia.com>
Link: https://lore.kernel.org/20250623075051.3610592-1-tan.shaopeng@jp.fujitsu.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/rdtgroup.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 77d08229d855..5f0b7cfa1cc2 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -2608,10 +2608,8 @@ static int rdt_get_tree(struct fs_context *fc)
 		goto out_root;
 
 	ret = schemata_list_create();
-	if (ret) {
-		schemata_list_destroy();
-		goto out_ctx;
-	}
+	if (ret)
+		goto out_schemata_free;
 
 	ret = closid_init();
 	if (ret)
@@ -2683,7 +2681,6 @@ static int rdt_get_tree(struct fs_context *fc)
 	closid_exit();
 out_schemata_free:
 	schemata_list_destroy();
-out_ctx:
 	rdt_disable_ctx();
 out_root:
 	rdtgroup_destroy_root();
-- 
Gitee


From c6fd18c87545b8db923b6b620e5b89d5cd2d5e2c Mon Sep 17 00:00:00 2001
From: Chen Yu <yu.c.chen@intel.com>
Date: Fri, 26 Sep 2025 12:17:22 +0800
Subject: [PATCH 279/280] x86/resctrl: Support Sub-NUMA Cluster (SNC) mode on
 Clearwater Forest

ANBZ: #31045

commit a0a0999507752574b80d7fbd179cce052c92791b upstream.

Clearwater Forest supports SNC mode. Add it to the snc_cpu_ids[] table.

Intel-SIG: commit a0a099950775 x86/resctrl: Support Sub-NUMA Cluster (SNC) mode on Clearwater Forest
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Acked-by: Tony Luck <tony.luck@intel.com>

 Conflicts:
	arch/x86/kernel/cpu/resctrl/monitor.c
[jz: resolve context conflict]
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 arch/x86/kernel/cpu/resctrl/monitor.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 3fc4d9f56f0d..60de452c9511 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -284,6 +284,7 @@ static const struct x86_cpu_id snc_cpu_ids[] __initconst = {
 	X86_MATCH_VFM(INTEL_EMERALDRAPIDS_X, 0),
 	X86_MATCH_VFM(INTEL_GRANITERAPIDS_X, 0),
 	X86_MATCH_VFM(INTEL_ATOM_CRESTMONT_X, 0),
+	X86_MATCH_VFM(INTEL_ATOM_DARKMONT_X, 0),
 	{}
 };
 
-- 
Gitee


From 397228777e4797dd3343800da04d2a0b1364470f Mon Sep 17 00:00:00 2001
From: Reinette Chatre <reinette.chatre@intel.com>
Date: Mon, 17 Nov 2025 16:42:45 -0800
Subject: [PATCH 280/280] fs/resctrl: Consider sparse masks when initializing
 new group's allocation

ANBZ: #31045

commit 5a88a6e92bbf5963fadeb0e8f8c747c2fb425ba8 upstream.

A new resource group is intended to be created with sane defaults. For a cache
resource this means all cache portions the new group could possibly allocate
into. This includes unused cache portions and shareable cache portions used by
other groups and hardware.

New resource group creation does not take sparse masks into account. After
determining the bitmask reflecting the new group's possible allocations the
bitmask is forced to be contiguous even if the system supports sparse masks.
For example, a new group could by default allocate into a large portion of
cache represented by 0xff0f, but it is instead created with a mask of 0xf.

Do not force a contiguous allocation range if the system supports sparse masks.

Intel-SIG: commit 5a88a6e92bbf fs/resctrl: Consider sparse masks when initializing new group's allocation
Backport Resctrl/RDT-SNC for Intel platforms

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/abbbb008bc09d982d715e79d3b885c10f92c64e0.1763426240.git.reinette.chatre@intel.com
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
---
 fs/resctrl/rdtgroup.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c
index 5f0b7cfa1cc2..31377854de15 100644
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -3245,11 +3245,12 @@ static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
 {
 	unsigned int cbm_len = r->cache.cbm_len;
 	unsigned long first_bit, zero_bit;
-	unsigned long val = _val;
+	unsigned long val;
 
-	if (!val)
-		return 0;
+	if (!_val || r->cache.arch_has_sparse_bitmasks)
+		return _val;
 
+	val = _val;
 	first_bit = find_first_bit(&val, cbm_len);
 	zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
 
-- 
Gitee