Merge tag 'x86_cache_for_v6.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 resource control updates from Borislav Petkov: "Add support on AMD for assigning QoS bandwidth counters to resources (RMIDs) with the ability for those resources to be tracked by the counters as long as they're assigned to them. Previously, due to hw limitations, bandwidth counts from untracked resources would get lost when those resources are not tracked. Refactor the code and user interfaces to be able to also support other, similar features on ARM, for example" * tag 'x86_cache_for_v6.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (35 commits) fs/resctrl: Fix counter auto-assignment on mkdir with mbm_event enabled MAINTAINERS: resctrl: Add myself as reviewer x86/resctrl: Configure mbm_event mode if supported fs/resctrl: Introduce the interface to switch between monitor modes fs/resctrl: Disable BMEC event configuration when mbm_event mode is enabled fs/resctrl: Introduce the interface to modify assignments in a group fs/resctrl: Introduce mbm_L3_assignments to list assignments in a group fs/resctrl: Auto assign counters on mkdir and clean up on group removal fs/resctrl: Introduce mbm_assign_on_mkdir to enable assignments on mkdir fs/resctrl: Provide interface to update the event configurations fs/resctrl: Add event configuration directory under info/L3_MON/ fs/resctrl: Support counter read/reset with mbm_event assignment mode x86/resctrl: Implement resctrl_arch_reset_cntr() and resctrl_arch_cntr_read() x86/resctrl: Refactor resctrl_arch_rmid_read() fs/resctrl: Introduce counter ID read, reset calls in mbm_event mode fs/resctrl: Pass struct rdtgroup instead of individual members fs/resctrl: Add the functionality to unassign MBM events fs/resctrl: Add the functionality to assign MBM events x86,fs/resctrl: Implement resctrl_arch_config_cntr() to assign a counter with ABMC fs/resctrl: Introduce event configuration field in struct mon_evt ...
2025-12-01 07:26:02 +07:00 · 2025-09-30 13:29:42 -07:00
parent a65879b458 dd86b69d20
commit 2cb8eeaf00
16 changed files with 2025 additions and 233 deletions
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -6163,7 +6163,7 @@
 	rdt=		[HW,X86,RDT]
 			Turn on/off individual RDT features. List is:
 			cmt, mbmtotal, mbmlocal, l3cat, l3cdp, l2cat, l2cdp,
-			mba, smba, bmec.
+			mba, smba, bmec, abmc.
 			E.g. to turn on cmt and turn off mba use:
 				rdt=cmt,!mba

--- a/Documentation/filesystems/resctrl.rst
+++ b/Documentation/filesystems/resctrl.rst
@@ -26,6 +26,7 @@ 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
@@ -256,6 +257,144 @@ with the following files:
 	    # cat /sys/fs/resctrl/info/L3_MON/mbm_local_bytes_config
 	    0=0x30;1=0x30;3=0x15;4=0x15

+"mbm_assign_mode":
+	The supported counter assignment modes. The enclosed brackets indicate which mode
+	is enabled. The MBM events associated with counters may reset when "mbm_assign_mode"
+	is changed.
+	::
+
+	  # cat /sys/fs/resctrl/info/L3_MON/mbm_assign_mode
+	  [mbm_event]
+	  default
+
+	"mbm_event":
+
+	mbm_event mode allows users to assign a hardware counter to an RMID, event
+	pair and monitor the bandwidth usage as long as it is assigned. The hardware
+	continues to track the assigned counter until it is explicitly unassigned by
+	the user. Each event within a resctrl group can be assigned independently.
+
+	In this mode, a monitoring event can only accumulate data while it is backed
+	by a hardware counter. Use "mbm_L3_assignments" found in each CTRL_MON and MON
+	group to specify which of the events should have a counter assigned. The number
+	of counters available is described in the "num_mbm_cntrs" file. Changing the
+	mode may cause all counters on the resource to reset.
+
+	Moving to mbm_event counter assignment mode requires users to assign the counters
+	to the events. Otherwise, the MBM event counters will return 'Unassigned' when read.
+
+	The mode is beneficial for AMD platforms that support more CTRL_MON
+	and MON groups than available hardware counters. By default, this
+	feature is enabled on AMD platforms with the ABMC (Assignable Bandwidth
+	Monitoring Counters) capability, ensuring counters remain assigned even
+	when the corresponding RMID is not actively used by any processor.
+
+	"default":
+
+	In default mode, resctrl assumes there is a hardware counter for each
+	event within every CTRL_MON and MON group. On AMD platforms, it is
+	recommended to use the mbm_event mode, if supported, to prevent reset of MBM
+	events between reads resulting from hardware re-allocating counters. This can
+	result in misleading values or display "Unavailable" if no counter is assigned
+	to the event.
+
+	* To enable "mbm_event" counter assignment mode:
+	  ::
+
+	    # echo "mbm_event" > /sys/fs/resctrl/info/L3_MON/mbm_assign_mode
+
+	* To enable "default" monitoring mode:
+	  ::
+
+	    # echo "default" > /sys/fs/resctrl/info/L3_MON/mbm_assign_mode
+
+"num_mbm_cntrs":
+	The maximum number of counters (total of available and assigned counters) in
+	each domain when the system supports mbm_event mode.
+
+	For example, on a system with maximum of 32 memory bandwidth monitoring
+	counters in each of its L3 domains:
+	::
+
+	  # cat /sys/fs/resctrl/info/L3_MON/num_mbm_cntrs
+	  0=32;1=32
+
+"available_mbm_cntrs":
+	The number of counters available for assignment in each domain when mbm_event
+	mode is enabled on the system.
+
+	For example, on a system with 30 available [hardware] assignable counters
+	in each of its L3 domains:
+	::
+
+	  # cat /sys/fs/resctrl/info/L3_MON/available_mbm_cntrs
+	  0=30;1=30
+
+"event_configs":
+	Directory that exists when "mbm_event" counter assignment mode is supported.
+	Contains a sub-directory for each MBM event that can be assigned to a counter.
+
+	Two MBM events are supported by default: mbm_local_bytes and mbm_total_bytes.
+	Each MBM event's sub-directory contains a file named "event_filter" that is
+	used to view and modify which memory transactions the MBM event is configured
+	with. The file is accessible only when "mbm_event" counter assignment mode is
+	enabled.
+
+	List of memory transaction types supported:
+
+	==========================  ========================================================
+	Name			    Description
+	==========================  ========================================================
+	dirty_victim_writes_all     Dirty Victims from the QOS domain to all types of memory
+	remote_reads_slow_memory    Reads to slow memory in the non-local NUMA domain
+	local_reads_slow_memory     Reads to slow memory in the local NUMA domain
+	remote_non_temporal_writes  Non-temporal writes to non-local NUMA domain
+	local_non_temporal_writes   Non-temporal writes to local NUMA domain
+	remote_reads                Reads to memory in the non-local NUMA domain
+	local_reads                 Reads to memory in the local NUMA domain
+	==========================  ========================================================
+
+	For example::
+
+	  # cat /sys/fs/resctrl/info/L3_MON/event_configs/mbm_total_bytes/event_filter
+	  local_reads,remote_reads,local_non_temporal_writes,remote_non_temporal_writes,
+	  local_reads_slow_memory,remote_reads_slow_memory,dirty_victim_writes_all
+
+	  # cat /sys/fs/resctrl/info/L3_MON/event_configs/mbm_local_bytes/event_filter
+	  local_reads,local_non_temporal_writes,local_reads_slow_memory
+
+	Modify the event configuration by writing to the "event_filter" file within
+	the "event_configs" directory. The read/write "event_filter" file contains the
+	configuration of the event that reflects which memory transactions are counted by it.
+
+	For example::
+
+	  # echo "local_reads, local_non_temporal_writes" >
+	    /sys/fs/resctrl/info/L3_MON/event_configs/mbm_total_bytes/event_filter
+
+	  # cat /sys/fs/resctrl/info/L3_MON/event_configs/mbm_total_bytes/event_filter
+	   local_reads,local_non_temporal_writes
+
+"mbm_assign_on_mkdir":
+	Exists when "mbm_event" counter assignment mode is supported. Accessible
+	only when "mbm_event" counter assignment mode is enabled.
+
+	Determines if a counter will automatically be assigned to an RMID, MBM event
+	pair when its associated monitor group is created via mkdir. Enabled by default
+	on boot, also when switched from "default" mode to "mbm_event" counter assignment
+	mode. Users can disable this capability by writing to the interface.
+
+	"0":
+		Auto assignment is disabled.
+	"1":
+		Auto assignment is enabled.
+
+	Example::
+
+	  # echo 0 > /sys/fs/resctrl/info/L3_MON/mbm_assign_on_mkdir
+	  # cat /sys/fs/resctrl/info/L3_MON/mbm_assign_on_mkdir
+	  0
+
 "max_threshold_occupancy":
 		Read/write file provides the largest value (in
 		bytes) at which a previously used LLC_occupancy
@@ -380,10 +519,77 @@ When monitoring is enabled all MON groups will also contain:
 	for the L3 cache they occupy). These are named "mon_sub_L3_YY"
 	where "YY" is the node number.

+	When the 'mbm_event' counter assignment mode is enabled, reading
+	an MBM event of a MON group returns 'Unassigned' if no hardware
+	counter is assigned to it. For CTRL_MON groups, 'Unassigned' is
+	returned if the MBM event does not have an assigned counter in the
+	CTRL_MON group nor in any of its associated MON groups.
+
 "mon_hw_id":
 	Available only with debug option. The identifier used by hardware
 	for the monitor group. On x86 this is the RMID.

+When monitoring is enabled all MON groups may also contain:
+
+"mbm_L3_assignments":
+	Exists when "mbm_event" counter assignment mode is supported and lists the
+	counter assignment states of the group.
+
+	The assignment list is displayed in the following format:
+
+	<Event>:<Domain ID>=<Assignment state>;<Domain ID>=<Assignment state>
+
+	Event: A valid MBM event in the
+	       /sys/fs/resctrl/info/L3_MON/event_configs directory.
+
+	Domain ID: A valid domain ID. When writing, '*' applies the changes
+		   to all the domains.
+
+	Assignment states:
+
+	_ : No counter assigned.
+
+	e : Counter assigned exclusively.
+
+	Example:
+
+	To display the counter assignment states for the default group.
+	::
+
+	 # cd /sys/fs/resctrl
+	 # cat /sys/fs/resctrl/mbm_L3_assignments
+	   mbm_total_bytes:0=e;1=e
+	   mbm_local_bytes:0=e;1=e
+
+	Assignments can be modified by writing to the interface.
+
+	Examples:
+
+	To unassign the counter associated with the mbm_total_bytes event on domain 0:
+	::
+
+	 # echo "mbm_total_bytes:0=_" > /sys/fs/resctrl/mbm_L3_assignments
+	 # cat /sys/fs/resctrl/mbm_L3_assignments
+	   mbm_total_bytes:0=_;1=e
+	   mbm_local_bytes:0=e;1=e
+
+	To unassign the counter associated with the mbm_total_bytes event on all the domains:
+	::
+
+	 # echo "mbm_total_bytes:*=_" > /sys/fs/resctrl/mbm_L3_assignments
+	 # cat /sys/fs/resctrl/mbm_L3_assignments
+	   mbm_total_bytes:0=_;1=_
+	   mbm_local_bytes:0=e;1=e
+
+	To assign a counter associated with the mbm_total_bytes event on all domains in
+	exclusive mode:
+	::
+
+	 # echo "mbm_total_bytes:*=e" > /sys/fs/resctrl/mbm_L3_assignments
+	 # cat /sys/fs/resctrl/mbm_L3_assignments
+	   mbm_total_bytes:0=e;1=e
+	   mbm_local_bytes:0=e;1=e
+
 When the "mba_MBps" mount option is used all CTRL_MON groups will also contain:

 "mba_MBps_event":
@@ -1429,6 +1635,125 @@ View the llc occupancy snapshot::
  # cat /sys/fs/resctrl/p1/mon_data/mon_L3_00/llc_occupancy
  11234000

+
+Examples on working with mbm_assign_mode
+========================================
+
+a. Check if MBM counter assignment mode is supported.
+::
+
+  # mount -t resctrl resctrl /sys/fs/resctrl/
+
+  # cat /sys/fs/resctrl/info/L3_MON/mbm_assign_mode
+  [mbm_event]
+  default
+
+The "mbm_event" mode is detected and enabled.
+
+b. Check how many assignable counters are supported.
+::
+
+  # cat /sys/fs/resctrl/info/L3_MON/num_mbm_cntrs
+  0=32;1=32
+
+c. Check how many assignable counters are available for assignment in each domain.
+::
+
+  # cat /sys/fs/resctrl/info/L3_MON/available_mbm_cntrs
+  0=30;1=30
+
+d. To list the default group's assign states.
+::
+
+  # cat /sys/fs/resctrl/mbm_L3_assignments
+  mbm_total_bytes:0=e;1=e
+  mbm_local_bytes:0=e;1=e
+
+e.  To unassign the counter associated with the mbm_total_bytes event on domain 0.
+::
+
+  # echo "mbm_total_bytes:0=_" > /sys/fs/resctrl/mbm_L3_assignments
+  # cat /sys/fs/resctrl/mbm_L3_assignments
+  mbm_total_bytes:0=_;1=e
+  mbm_local_bytes:0=e;1=e
+
+f. To unassign the counter associated with the mbm_total_bytes event on all domains.
+::
+
+  # echo "mbm_total_bytes:*=_" > /sys/fs/resctrl/mbm_L3_assignments
+  # cat /sys/fs/resctrl/mbm_L3_assignment
+  mbm_total_bytes:0=_;1=_
+  mbm_local_bytes:0=e;1=e
+
+g. To assign a counter associated with the mbm_total_bytes event on all domains in
+exclusive mode.
+::
+
+  # echo "mbm_total_bytes:*=e" > /sys/fs/resctrl/mbm_L3_assignments
+  # cat /sys/fs/resctrl/mbm_L3_assignments
+  mbm_total_bytes:0=e;1=e
+  mbm_local_bytes:0=e;1=e
+
+h. Read the events mbm_total_bytes and mbm_local_bytes of the default group. There is
+no change in reading the events with the assignment.
+::
+
+  # cat /sys/fs/resctrl/mon_data/mon_L3_00/mbm_total_bytes
+  779247936
+  # cat /sys/fs/resctrl/mon_data/mon_L3_01/mbm_total_bytes
+  562324232
+  # cat /sys/fs/resctrl/mon_data/mon_L3_00/mbm_local_bytes
+  212122123
+  # cat /sys/fs/resctrl/mon_data/mon_L3_01/mbm_local_bytes
+  121212144
+
+i. Check the event configurations.
+::
+
+  # cat /sys/fs/resctrl/info/L3_MON/event_configs/mbm_total_bytes/event_filter
+  local_reads,remote_reads,local_non_temporal_writes,remote_non_temporal_writes,
+  local_reads_slow_memory,remote_reads_slow_memory,dirty_victim_writes_all
+
+  # cat /sys/fs/resctrl/info/L3_MON/event_configs/mbm_local_bytes/event_filter
+  local_reads,local_non_temporal_writes,local_reads_slow_memory
+
+j. Change the event configuration for mbm_local_bytes.
+::
+
+  # echo "local_reads, local_non_temporal_writes, local_reads_slow_memory, remote_reads" >
+  /sys/fs/resctrl/info/L3_MON/event_configs/mbm_local_bytes/event_filter
+
+  # cat /sys/fs/resctrl/info/L3_MON/event_configs/mbm_local_bytes/event_filter
+  local_reads,local_non_temporal_writes,local_reads_slow_memory,remote_reads
+
+k. Now read the local events again. The first read may come back with "Unavailable"
+status. The subsequent read of mbm_local_bytes will display the current value.
+::
+
+  # cat /sys/fs/resctrl/mon_data/mon_L3_00/mbm_local_bytes
+  Unavailable
+  # cat /sys/fs/resctrl/mon_data/mon_L3_00/mbm_local_bytes
+  2252323
+  # cat /sys/fs/resctrl/mon_data/mon_L3_01/mbm_local_bytes
+  Unavailable
+  # cat /sys/fs/resctrl/mon_data/mon_L3_01/mbm_local_bytes
+  1566565
+
+l. Users have the option to go back to 'default' mbm_assign_mode if required. This can be
+done using the following command. Note that switching the mbm_assign_mode may reset all
+the MBM counters (and thus all MBM events) of all the resctrl groups.
+::
+
+  # echo "default" > /sys/fs/resctrl/info/L3_MON/mbm_assign_mode
+  # cat /sys/fs/resctrl/info/L3_MON/mbm_assign_mode
+  mbm_event
+  [default]
+
+m. Unmount the resctrl filesystem.
+::
+
+  # umount /sys/fs/resctrl/
+
 Intel RDT Errata
 ================

--- a/1
+++ b/1
@@ -21186,6 +21186,7 @@ M:	Tony Luck <tony.luck@intel.com>
 M:	Reinette Chatre <reinette.chatre@intel.com>
 R:	Dave Martin <Dave.Martin@arm.com>
 R:	James Morse <james.morse@arm.com>
+R:	Babu Moger <babu.moger@amd.com>
 L:	linux-kernel@vger.kernel.org
 S:	Supported
 F:	Documentation/filesystems/resctrl.rst
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -496,6 +496,7 @@
 #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_IBPB_EXIT_TO_USER	(21*32+14) /* Use IBPB on exit-to-userspace, see VMSCAPE bug */
+#define X86_FEATURE_ABMC		(21*32+15) /* Assignable Bandwidth Monitoring Counters */

 /*
 * BUG word(s)
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -1230,6 +1230,8 @@
 /* - AMD: */
 #define MSR_IA32_MBA_BW_BASE		0xc0000200
 #define MSR_IA32_SMBA_BW_BASE		0xc0000280
+#define MSR_IA32_L3_QOS_ABMC_CFG	0xc00003fd
+#define MSR_IA32_L3_QOS_EXT_CFG		0xc00003ff
 #define MSR_IA32_EVT_CFG_BASE		0xc0000400

 /* AMD-V MSRs */
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -44,7 +44,6 @@ 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 +83,6 @@ 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
 *
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -107,7 +107,7 @@ 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;
+	return r->mon.num_rmid;
 }

 struct rdt_resource *resctrl_arch_get_resource(enum resctrl_res_level l)
@@ -365,8 +365,10 @@ static void ctrl_domain_free(struct rdt_hw_ctrl_domain *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);
+	int idx;
+
+	for_each_mbm_idx(idx)
+		kfree(hw_dom->arch_mbm_states[idx]);
 	kfree(hw_dom);
 }

@@ -400,25 +402,27 @@ static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_ctrl_domain *
 */
 static int arch_domain_mbm_alloc(u32 num_rmid, struct rdt_hw_mon_domain *hw_dom)
 {
-	size_t tsize;
+	size_t tsize = sizeof(*hw_dom->arch_mbm_states[0]);
+	enum resctrl_event_id eventid;
+	int idx;

-	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 (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) {
-			kfree(hw_dom->arch_mbm_total);
-			hw_dom->arch_mbm_total = NULL;
-			return -ENOMEM;
-		}
+	for_each_mbm_event_id(eventid) {
+		if (!resctrl_is_mon_event_enabled(eventid))
+			continue;
+		idx = MBM_STATE_IDX(eventid);
+		hw_dom->arch_mbm_states[idx] = kcalloc(num_rmid, tsize, GFP_KERNEL);
+		if (!hw_dom->arch_mbm_states[idx])
+			goto cleanup;
 	}

 	return 0;
+cleanup:
+	for_each_mbm_idx(idx) {
+		kfree(hw_dom->arch_mbm_states[idx]);
+		hw_dom->arch_mbm_states[idx] = NULL;
+	}
+
+	return -ENOMEM;
 }

 static int get_domain_id_from_scope(int cpu, enum resctrl_scope scope)
@@ -516,6 +520,9 @@ static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
 		d = container_of(hdr, struct rdt_mon_domain, hdr);

 		cpumask_set_cpu(cpu, &d->hdr.cpu_mask);
+		/* Update the mbm_assign_mode state for the CPU if supported */
+		if (r->mon.mbm_cntr_assignable)
+			resctrl_arch_mbm_cntr_assign_set_one(r);
 		return;
 	}

@@ -535,9 +542,13 @@ static void domain_add_cpu_mon(int cpu, struct rdt_resource *r)
 	d->ci_id = ci->id;
 	cpumask_set_cpu(cpu, &d->hdr.cpu_mask);

+	/* Update the mbm_assign_mode state for the CPU if supported */
+	if (r->mon.mbm_cntr_assignable)
+		resctrl_arch_mbm_cntr_assign_set_one(r);
+
 	arch_mon_domain_online(r, d);

-	if (arch_domain_mbm_alloc(r->num_rmid, hw_dom)) {
+	if (arch_domain_mbm_alloc(r->mon.num_rmid, hw_dom)) {
 		mon_domain_free(hw_dom);
 		return;
 	}
@@ -707,6 +718,7 @@ enum {
 	RDT_FLAG_MBA,
 	RDT_FLAG_SMBA,
 	RDT_FLAG_BMEC,
+	RDT_FLAG_ABMC,
 };

 #define RDT_OPT(idx, n, f)	\
@@ -732,6 +744,7 @@ 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)

@@ -863,15 +876,24 @@ static __init bool get_rdt_alloc_resources(void)
 static __init bool get_rdt_mon_resources(void)
 {
 	struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
+	bool ret = false;

-	if (rdt_cpu_has(X86_FEATURE_CQM_OCCUP_LLC))
-		rdt_mon_features |= (1 << QOS_L3_OCCUP_EVENT_ID);
-	if (rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL))
-		rdt_mon_features |= (1 << QOS_L3_MBM_TOTAL_EVENT_ID);
-	if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL))
-		rdt_mon_features |= (1 << QOS_L3_MBM_LOCAL_EVENT_ID);
+	if (rdt_cpu_has(X86_FEATURE_CQM_OCCUP_LLC)) {
+		resctrl_enable_mon_event(QOS_L3_OCCUP_EVENT_ID);
+		ret = true;
+	}
+	if (rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL)) {
+		resctrl_enable_mon_event(QOS_L3_MBM_TOTAL_EVENT_ID);
+		ret = true;
+	}
+	if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL)) {
+		resctrl_enable_mon_event(QOS_L3_MBM_LOCAL_EVENT_ID);
+		ret = true;
+	}
+	if (rdt_cpu_has(X86_FEATURE_ABMC))
+		ret = true;

-	if (!rdt_mon_features)
+	if (!ret)
 		return false;

 	return !rdt_get_mon_l3_config(r);
@@ -965,7 +987,7 @@ static enum cpuhp_state rdt_online;
 /* Runs once on the BSP during boot. */
 void resctrl_cpu_detect(struct cpuinfo_x86 *c)
 {
-	if (!cpu_has(c, X86_FEATURE_CQM_LLC)) {
+	if (!cpu_has(c, X86_FEATURE_CQM_LLC) && !cpu_has(c, X86_FEATURE_ABMC)) {
 		c->x86_cache_max_rmid  = -1;
 		c->x86_cache_occ_scale = -1;
 		c->x86_cache_mbm_width_offset = -1;
@@ -977,7 +999,8 @@ void resctrl_cpu_detect(struct cpuinfo_x86 *c)

 	if (cpu_has(c, X86_FEATURE_CQM_OCCUP_LLC) ||
 	    cpu_has(c, X86_FEATURE_CQM_MBM_TOTAL) ||
-	    cpu_has(c, X86_FEATURE_CQM_MBM_LOCAL)) {
+	    cpu_has(c, X86_FEATURE_CQM_MBM_LOCAL) ||
+	    cpu_has(c, X86_FEATURE_ABMC)) {
 		u32 eax, ebx, ecx, edx;

 		/* QoS sub-leaf, EAX=0Fh, ECX=1 */
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -37,6 +37,15 @@ struct arch_mbm_state {
 	u64	prev_msr;
 };

+/* Setting bit 0 in L3_QOS_EXT_CFG enables the ABMC feature. */
+#define ABMC_ENABLE_BIT			0
+
+/*
+ * Qos Event Identifiers.
+ */
+#define ABMC_EXTENDED_EVT_ID		BIT(31)
+#define ABMC_EVT_ID			BIT(0)
+
 /**
 * struct rdt_hw_ctrl_domain - Arch private attributes of a set of CPUs that share
 *			       a resource for a control function
@@ -54,15 +63,15 @@ struct rdt_hw_ctrl_domain {
 * 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
+ * @arch_mbm_states:	Per-event pointer to the MBM event's saved state.
+ *			An MBM event's state is an array of struct arch_mbm_state
+ *			indexed by RMID on x86.
 *
 * Members of this structure are accessed via helpers that provide abstraction.
 */
 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;
+	struct arch_mbm_state		*arch_mbm_states[QOS_NUM_L3_MBM_EVENTS];
 };

 static inline struct rdt_hw_ctrl_domain *resctrl_to_arch_ctrl_dom(struct rdt_ctrl_domain *r)
@@ -102,6 +111,7 @@ 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.
@@ -115,6 +125,7 @@ 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)
@@ -159,6 +170,42 @@ union cpuid_0x10_x_edx {
 	unsigned int full;
 };

+/*
+ * ABMC counters are configured by writing to MSR_IA32_L3_QOS_ABMC_CFG.
+ *
+ * @bw_type		: Event configuration that represents the memory
+ *			  transactions being 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		: Counting enable bit.
+ * @cfg_en		: Configuration enable bit.
+ *
+ * Configuration and counting:
+ * Counter can be configured across multiple writes to MSR. Configuration
+ * is applied only when @cfg_en = 1. Counter @cntr_id is reset when the
+ * configuration is applied.
+ * @cfg_en = 1, @cntr_en = 0 : Apply @cntr_id configuration but do not
+ *                             count events.
+ * @cfg_en = 1, @cntr_en = 1 : Apply @cntr_id configuration and start
+ *                             counting events.
+ */
+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);
@@ -168,5 +215,6 @@ 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_arch_mbm_cntr_assign_set_one(struct rdt_resource *r);

 #endif /* _ASM_X86_RESCTRL_INTERNAL_H */
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -31,11 +31,6 @@
 */
 bool rdt_mon_capable;

-/*
- * Global to indicate which monitoring events are enabled.
- */
-unsigned int rdt_mon_features;
-
 #define CF(cf)	((unsigned long)(1048576 * (cf) + 0.5))

 static int snc_nodes_per_l3_cache = 1;
@@ -135,7 +130,7 @@ static int logical_rmid_to_physical_rmid(int cpu, int lrmid)
 	if (snc_nodes_per_l3_cache == 1)
 		return lrmid;

-	return lrmid + (cpu_to_node(cpu) % snc_nodes_per_l3_cache) * r->num_rmid;
+	return lrmid + (cpu_to_node(cpu) % snc_nodes_per_l3_cache) * r->mon.num_rmid;
 }

 static int __rmid_read_phys(u32 prmid, enum resctrl_event_id eventid, u64 *val)
@@ -166,18 +161,14 @@ static struct arch_mbm_state *get_arch_mbm_state(struct rdt_hw_mon_domain *hw_do
 						 u32 rmid,
 						 enum resctrl_event_id eventid)
 {
-	switch (eventid) {
-	case QOS_L3_OCCUP_EVENT_ID:
+	struct arch_mbm_state *state;
+
+	if (!resctrl_is_mbm_event(eventid))
 		return NULL;
-	case QOS_L3_MBM_TOTAL_EVENT_ID:
-		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;
-	}
+
+	state = hw_dom->arch_mbm_states[MBM_STATE_IDX(eventid)];
+
+	return state ? &state[rmid] : NULL;
 }

 void resctrl_arch_reset_rmid(struct rdt_resource *r, struct rdt_mon_domain *d,
@@ -206,14 +197,16 @@ 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)
 {
 	struct rdt_hw_mon_domain *hw_dom = resctrl_to_arch_mon_dom(d);
+	enum resctrl_event_id eventid;
+	int idx;

-	if (resctrl_arch_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())
-		memset(hw_dom->arch_mbm_local, 0,
-		       sizeof(*hw_dom->arch_mbm_local) * r->num_rmid);
+	for_each_mbm_event_id(eventid) {
+		if (!resctrl_is_mon_event_enabled(eventid))
+			continue;
+		idx = MBM_STATE_IDX(eventid);
+		memset(hw_dom->arch_mbm_states[idx], 0,
+		       sizeof(*hw_dom->arch_mbm_states[0]) * r->mon.num_rmid);
+	}
 }

 static u64 mbm_overflow_count(u64 prev_msr, u64 cur_msr, unsigned int width)
@@ -224,24 +217,13 @@ 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_mon_domain *d,
-			   u32 unused, u32 rmid, enum resctrl_event_id eventid,
-			   u64 *val, void *ignored)
+static u64 get_corrected_val(struct rdt_resource *r, struct rdt_mon_domain *d,
+			     u32 rmid, enum resctrl_event_id eventid, u64 msr_val)
 {
 	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();
-
-	prmid = logical_rmid_to_physical_rmid(cpu, rmid);
-	ret = __rmid_read_phys(prmid, eventid, &msr_val);
-	if (ret)
-		return ret;
+	u64 chunks;

 	am = get_arch_mbm_state(hw_dom, rmid, eventid);
 	if (am) {
@@ -253,7 +235,95 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_mon_domain *d,
 		chunks = msr_val;
 	}

-	*val = chunks * hw_res->mon_scale;
+	return chunks * hw_res->mon_scale;
+}
+
+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)
+{
+	int cpu = cpumask_any(&d->hdr.cpu_mask);
+	u64 msr_val;
+	u32 prmid;
+	int ret;
+
+	resctrl_arch_rmid_read_context_check();
+
+	prmid = logical_rmid_to_physical_rmid(cpu, rmid);
+	ret = __rmid_read_phys(prmid, eventid, &msr_val);
+	if (ret)
+		return ret;
+
+	*val = get_corrected_val(r, d, rmid, eventid, msr_val);
+
+	return 0;
+}
+
+static int __cntr_id_read(u32 cntr_id, u64 *val)
+{
+	u64 msr_val;
+
+	/*
+	 * QM_EVTSEL Register definition:
+	 * =======================================================
+	 * Bits    Mnemonic        Description
+	 * =======================================================
+	 * 63:44   --              Reserved
+	 * 43:32   RMID            RMID or counter ID in ABMC mode
+	 *                         when reading an MBM event
+	 * 31      ExtendedEvtID   Extended Event Identifier
+	 * 30:8    --              Reserved
+	 * 7:0     EvtID           Event Identifier
+	 * =======================================================
+	 * The contents of a specific counter can be read by setting the
+	 * following fields in QM_EVTSEL.ExtendedEvtID(=1) and
+	 * QM_EVTSEL.EvtID = L3CacheABMC (=1) and setting QM_EVTSEL.RMID
+	 * to the desired counter ID. Reading the QM_CTR then returns the
+	 * contents of the specified counter. The RMID_VAL_ERROR bit is set
+	 * if the counter configuration is invalid, or if an invalid counter
+	 * ID is set in the QM_EVTSEL.RMID field.  The RMID_VAL_UNAVAIL bit
+	 * is set if the counter data is unavailable.
+	 */
+	wrmsr(MSR_IA32_QM_EVTSEL, ABMC_EXTENDED_EVT_ID | ABMC_EVT_ID, cntr_id);
+	rdmsrl(MSR_IA32_QM_CTR, msr_val);
+
+	if (msr_val & RMID_VAL_ERROR)
+		return -EIO;
+	if (msr_val & RMID_VAL_UNAVAIL)
+		return -EINVAL;
+
+	*val = msr_val;
+	return 0;
+}
+
+void resctrl_arch_reset_cntr(struct rdt_resource *r, struct rdt_mon_domain *d,
+			     u32 unused, u32 rmid, int cntr_id,
+			     enum resctrl_event_id eventid)
+{
+	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);
+	if (am) {
+		memset(am, 0, sizeof(*am));
+
+		/* Record any initial, non-zero count value. */
+		__cntr_id_read(cntr_id, &am->prev_msr);
+	}
+}
+
+int resctrl_arch_cntr_read(struct rdt_resource *r, struct rdt_mon_domain *d,
+			   u32 unused, u32 rmid, int cntr_id,
+			   enum resctrl_event_id eventid, u64 *val)
+{
+	u64 msr_val;
+	int ret;
+
+	ret = __cntr_id_read(cntr_id, &msr_val);
+	if (ret)
+		return ret;
+
+	*val = get_corrected_val(r, d, rmid, eventid, msr_val);

 	return 0;
 }
@@ -346,12 +416,13 @@ 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;

 	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;
+	r->mon.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)
@@ -366,7 +437,7 @@ 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->num_rmid;
+	threshold = resctrl_rmid_realloc_limit / r->mon.num_rmid;

 	/*
 	 * Because num_rmid may not be a power of two, round the value
@@ -375,12 +446,17 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
 	 */
 	resctrl_rmid_realloc_threshold = resctrl_arch_round_mon_val(threshold);

-	if (rdt_cpu_has(X86_FEATURE_BMEC)) {
-		u32 eax, ebx, ecx, edx;
-
+	if (rdt_cpu_has(X86_FEATURE_BMEC) || rdt_cpu_has(X86_FEATURE_ABMC)) {
 		/* 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;
+		r->mon.mbm_cfg_mask = ecx & MAX_EVT_CONFIG_BITS;
+	}
+
+	if (rdt_cpu_has(X86_FEATURE_ABMC)) {
+		r->mon.mbm_cntr_assignable = true;
+		cpuid_count(0x80000020, 5, &eax, &ebx, &ecx, &edx);
+		r->mon.num_mbm_cntrs = (ebx & GENMASK(15, 0)) + 1;
+		hw_res->mbm_cntr_assign_enabled = true;
 	}

 	r->mon_capable = true;
@@ -401,3 +477,91 @@ void __init intel_rdt_mbm_apply_quirk(void)
 	mbm_cf_rmidthreshold = mbm_cf_table[cf_index].rmidthreshold;
 	mbm_cf = mbm_cf_table[cf_index].cf;
 }
+
+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);
+}
+
+/*
+ * ABMC enable/disable requires update of L3_QOS_EXT_CFG MSR on all the CPUs
+ * associated with all monitor domains.
+ */
+static void _resctrl_abmc_enable(struct rdt_resource *r, bool enable)
+{
+	struct rdt_mon_domain *d;
+
+	lockdep_assert_cpus_held();
+
+	list_for_each_entry(d, &r->mon_domains, hdr.list) {
+		on_each_cpu_mask(&d->hdr.cpu_mask, resctrl_abmc_set_one_amd,
+				 &enable, 1);
+		resctrl_arch_reset_rmid_all(r, d);
+	}
+}
+
+int resctrl_arch_mbm_cntr_assign_set(struct rdt_resource *r, bool enable)
+{
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
+
+	if (r->mon.mbm_cntr_assignable &&
+	    hw_res->mbm_cntr_assign_enabled != enable) {
+		_resctrl_abmc_enable(r, enable);
+		hw_res->mbm_cntr_assign_enabled = enable;
+	}
+
+	return 0;
+}
+
+bool resctrl_arch_mbm_cntr_assign_enabled(struct rdt_resource *r)
+{
+	return resctrl_to_arch_res(r)->mbm_cntr_assign_enabled;
+}
+
+static void resctrl_abmc_config_one_amd(void *info)
+{
+	union l3_qos_abmc_cfg *abmc_cfg = info;
+
+	wrmsrl(MSR_IA32_L3_QOS_ABMC_CFG, abmc_cfg->full);
+}
+
+/*
+ * Send an IPI to the domain to assign the counter to RMID, event pair.
+ */
+void resctrl_arch_config_cntr(struct rdt_resource *r, struct rdt_mon_domain *d,
+			      enum resctrl_event_id evtid, u32 rmid, u32 closid,
+			      u32 cntr_id, bool assign)
+{
+	struct rdt_hw_mon_domain *hw_dom = resctrl_to_arch_mon_dom(d);
+	union l3_qos_abmc_cfg abmc_cfg = { 0 };
+	struct arch_mbm_state *am;
+
+	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;
+	if (assign)
+		abmc_cfg.split.bw_type = resctrl_get_mon_evt_cfg(evtid);
+
+	smp_call_function_any(&d->hdr.cpu_mask, resctrl_abmc_config_one_amd, &abmc_cfg, 1);
+
+	/*
+	 * The hardware counter is reset (because cfg_en == 1) so there is no
+	 * need to record initial non-zero counts.
+	 */
+	am = get_arch_mbm_state(hw_dom, rmid, evtid);
+	if (am)
+		memset(am, 0, sizeof(*am));
+}
+
+void resctrl_arch_mbm_cntr_assign_set_one(struct rdt_resource *r)
+{
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
+
+	resctrl_abmc_set_one_amd(&hw_res->mbm_cntr_assign_enabled);
+}
--- a/arch/x86/kernel/cpu/scattered.c
+++ b/arch/x86/kernel/cpu/scattered.c
@@ -51,6 +51,7 @@ static const struct cpuid_bit cpuid_bits[] = {
 	{ X86_FEATURE_COHERENCY_SFW_NO,		CPUID_EBX, 31, 0x8000001f, 0 },
 	{ X86_FEATURE_SMBA,			CPUID_EBX,  2, 0x80000020, 0 },
 	{ X86_FEATURE_BMEC,			CPUID_EBX,  3, 0x80000020, 0 },
+	{ X86_FEATURE_ABMC,			CPUID_EBX,  5, 0x80000020, 0 },
 	{ X86_FEATURE_TSA_SQ_NO,		CPUID_ECX,  1, 0x80000021, 0 },
 	{ X86_FEATURE_TSA_L1_NO,		CPUID_ECX,  2, 0x80000021, 0 },
 	{ X86_FEATURE_AMD_WORKLOAD_CLASS,	CPUID_EAX, 22, 0x80000021, 0 },
--- a/fs/resctrl/ctrlmondata.c
+++ b/fs/resctrl/ctrlmondata.c
@@ -473,12 +473,12 @@ ssize_t rdtgroup_mba_mbps_event_write(struct kernfs_open_file *of,
 	rdt_last_cmd_clear();

 	if (!strcmp(buf, "mbm_local_bytes")) {
-		if (resctrl_arch_is_mbm_local_enabled())
+		if (resctrl_is_mon_event_enabled(QOS_L3_MBM_LOCAL_EVENT_ID))
 			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())
+		if (resctrl_is_mon_event_enabled(QOS_L3_MBM_TOTAL_EVENT_ID))
 			rdtgrp->mba_mbps_event = QOS_L3_MBM_TOTAL_EVENT_ID;
 		else
 			ret = -EINVAL;
@@ -563,11 +563,16 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 	rr->r = r;
 	rr->d = d;
 	rr->first = first;
+	if (resctrl_arch_mbm_cntr_assign_enabled(r) &&
+	    resctrl_is_mbm_event(evtid)) {
+		rr->is_mbm_cntr = true;
+	} else {
 		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);

@@ -582,6 +587,7 @@ void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
 	else
 		smp_call_on_cpu(cpu, smp_mon_event_count, rr, false);

+	if (rr->arch_mon_ctx)
 		resctrl_arch_mon_ctx_free(r, evtid, rr->arch_mon_ctx);
 }

@@ -653,10 +659,16 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)

 checkresult:

+	/*
+	 * -ENOENT is a special case, set only when "mbm_event" counter assignment
+	 * mode is enabled and no counter has been assigned.
+	 */
 	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);

--- a/fs/resctrl/internal.h
+++ b/fs/resctrl/internal.h
@@ -52,19 +52,31 @@ static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
 }

 /**
- * struct mon_evt - Entry in the event list of a resource
+ * struct mon_evt - Properties of a monitor event
 * @evtid:		event id
+ * @rid:		resource id for this event
 * @name:		name of the event
+ * @evt_cfg:		Event configuration value that represents the
+ *			memory transactions (e.g., READS_TO_LOCAL_MEM,
+ *			READS_TO_REMOTE_MEM) being tracked by @evtid.
+ *			Only valid if @evtid is an MBM event.
 * @configurable:	true if the event is configurable
- * @list:		entry in &rdt_resource->evt_list
+ * @enabled:		true if the event is enabled
 */
 struct mon_evt {
 	enum resctrl_event_id	evtid;
+	enum resctrl_res_level	rid;
 	char			*name;
+	u32			evt_cfg;
 	bool			configurable;
-	struct list_head	list;
+	bool			enabled;
 };

+extern struct mon_evt mon_event_all[QOS_NUM_EVENTS];
+
+#define for_each_mon_event(mevt) for (mevt = &mon_event_all[QOS_FIRST_EVENT];	\
+				      mevt < &mon_event_all[QOS_NUM_EVENTS]; mevt++)
+
 /**
 * struct mon_data - Monitoring details for each event file.
 * @list:            Member of the global @mon_data_kn_priv_list list.
@@ -99,6 +111,8 @@ struct mon_data {
 * @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.
+ * @is_mbm_cntr: true if "mbm_event" counter assignment mode is enabled and it
+ *	   is an MBM event.
 * @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.
@@ -113,6 +127,7 @@ struct rmid_read {
 	enum resctrl_event_id	evtid;
 	bool			first;
 	struct cacheinfo	*ci;
+	bool			is_mbm_cntr;
 	int			err;
 	u64			val;
 	void			*arch_mon_ctx;
@@ -226,6 +241,8 @@ struct rdtgroup {

 #define RFTYPE_DEBUG			BIT(10)

+#define RFTYPE_ASSIGN_CONFIG		BIT(11)
+
 #define RFTYPE_CTRL_INFO		(RFTYPE_INFO | RFTYPE_CTRL)

 #define RFTYPE_MON_INFO			(RFTYPE_INFO | RFTYPE_MON)
@@ -375,6 +392,41 @@ bool closid_allocated(unsigned int closid);

 int resctrl_find_cleanest_closid(void);

+void *rdt_kn_parent_priv(struct kernfs_node *kn);
+
+int resctrl_mbm_assign_mode_show(struct kernfs_open_file *of, struct seq_file *s, void *v);
+
+ssize_t resctrl_mbm_assign_mode_write(struct kernfs_open_file *of, char *buf,
+				      size_t nbytes, loff_t off);
+
+void resctrl_bmec_files_show(struct rdt_resource *r, struct kernfs_node *l3_mon_kn,
+			     bool show);
+
+int resctrl_num_mbm_cntrs_show(struct kernfs_open_file *of, struct seq_file *s, void *v);
+
+int resctrl_available_mbm_cntrs_show(struct kernfs_open_file *of, struct seq_file *s,
+				     void *v);
+
+void rdtgroup_assign_cntrs(struct rdtgroup *rdtgrp);
+
+void rdtgroup_unassign_cntrs(struct rdtgroup *rdtgrp);
+
+int event_filter_show(struct kernfs_open_file *of, struct seq_file *seq, void *v);
+
+ssize_t event_filter_write(struct kernfs_open_file *of, char *buf, size_t nbytes,
+			   loff_t off);
+
+int resctrl_mbm_assign_on_mkdir_show(struct kernfs_open_file *of,
+				     struct seq_file *s, void *v);
+
+ssize_t resctrl_mbm_assign_on_mkdir_write(struct kernfs_open_file *of, char *buf,
+					  size_t nbytes, loff_t off);
+
+int mbm_L3_assignments_show(struct kernfs_open_file *of, struct seq_file *s, void *v);
+
+ssize_t mbm_L3_assignments_write(struct kernfs_open_file *of, char *buf, size_t nbytes,
+				 loff_t off);
+
 #ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK
 int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp);

--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
--- a/fs/resctrl/rdtgroup.c
+++ b/fs/resctrl/rdtgroup.c
@@ -123,14 +123,8 @@ 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);
+	return (resctrl_is_mon_event_enabled(QOS_L3_MBM_TOTAL_EVENT_ID) ||
+		resctrl_is_mon_event_enabled(QOS_L3_MBM_LOCAL_EVENT_ID));
 }

 /*
@@ -196,7 +190,7 @@ 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()) {
+	    resctrl_is_mon_event_enabled(QOS_L3_OCCUP_EVENT_ID)) {
 		cleanest_closid = resctrl_find_cleanest_closid();
 		if (cleanest_closid < 0)
 			return cleanest_closid;
@@ -981,7 +975,7 @@ static int rdt_last_cmd_status_show(struct kernfs_open_file *of,
 	return 0;
 }

-static void *rdt_kn_parent_priv(struct kernfs_node *kn)
+void *rdt_kn_parent_priv(struct kernfs_node *kn)
 {
 	/*
 	 * The parent pointer is only valid within RCU section since it can be
@@ -1141,7 +1135,7 @@ static int rdt_num_rmids_show(struct kernfs_open_file *of,
 {
 	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);

-	seq_printf(seq, "%d\n", r->num_rmid);
+	seq_printf(seq, "%d\n", r->mon.num_rmid);

 	return 0;
 }
@@ -1152,9 +1146,12 @@ static int rdt_mon_features_show(struct kernfs_open_file *of,
 	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
 	struct mon_evt *mevt;

-	list_for_each_entry(mevt, &r->evt_list, list) {
+	for_each_mon_event(mevt) {
+		if (mevt->rid != r->rid || !mevt->enabled)
+			continue;
 		seq_printf(seq, "%s\n", mevt->name);
-		if (mevt->configurable)
+		if (mevt->configurable &&
+		    !resctrl_arch_mbm_cntr_assign_enabled(r))
 			seq_printf(seq, "%s_config\n", mevt->name);
 	}

@@ -1735,9 +1732,9 @@ next:
 	}

 	/* Value from user cannot be more than the supported set of events */
-	if ((val & r->mbm_cfg_mask) != val) {
+	if ((val & r->mon.mbm_cfg_mask) != val) {
 		rdt_last_cmd_printf("Invalid event configuration: max valid mask is 0x%02x\n",
-				    r->mbm_cfg_mask);
+				    r->mon.mbm_cfg_mask);
 		return -EINVAL;
 	}

@@ -1803,6 +1800,44 @@ static ssize_t mbm_local_bytes_config_write(struct kernfs_open_file *of,
 	return ret ?: nbytes;
 }

+/*
+ * resctrl_bmec_files_show() — Controls the visibility of BMEC-related resctrl
+ * files. When @show is true, the files are displayed; when false, the files
+ * are hidden.
+ * Don't treat kernfs_find_and_get failure as an error, since this function may
+ * be called regardless of whether BMEC is supported or the event is enabled.
+ */
+void resctrl_bmec_files_show(struct rdt_resource *r, struct kernfs_node *l3_mon_kn,
+			     bool show)
+{
+	struct kernfs_node *kn_config, *mon_kn = NULL;
+	char name[32];
+
+	if (!l3_mon_kn) {
+		sprintf(name, "%s_MON", r->name);
+		mon_kn = kernfs_find_and_get(kn_info, name);
+		if (!mon_kn)
+			return;
+		l3_mon_kn = mon_kn;
+	}
+
+	kn_config = kernfs_find_and_get(l3_mon_kn, "mbm_total_bytes_config");
+	if (kn_config) {
+		kernfs_show(kn_config, show);
+		kernfs_put(kn_config);
+	}
+
+	kn_config = kernfs_find_and_get(l3_mon_kn, "mbm_local_bytes_config");
+	if (kn_config) {
+		kernfs_show(kn_config, show);
+		kernfs_put(kn_config);
+	}
+
+	/* Release the reference only if it was acquired */
+	if (mon_kn)
+		kernfs_put(mon_kn);
+}
+
 /* rdtgroup information files for one cache resource. */
 static struct rftype res_common_files[] = {
 	{
@@ -1812,6 +1847,13 @@ static struct rftype res_common_files[] = {
 		.seq_show	= rdt_last_cmd_status_show,
 		.fflags		= RFTYPE_TOP_INFO,
 	},
+	{
+		.name		= "mbm_assign_on_mkdir",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= resctrl_mbm_assign_on_mkdir_show,
+		.write		= resctrl_mbm_assign_on_mkdir_write,
+	},
 	{
 		.name		= "num_closids",
 		.mode		= 0444,
@@ -1826,6 +1868,12 @@ static struct rftype res_common_files[] = {
 		.seq_show	= rdt_mon_features_show,
 		.fflags		= RFTYPE_MON_INFO,
 	},
+	{
+		.name		= "available_mbm_cntrs",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= resctrl_available_mbm_cntrs_show,
+	},
 	{
 		.name		= "num_rmids",
 		.mode		= 0444,
@@ -1840,6 +1888,12 @@ static struct rftype res_common_files[] = {
 		.seq_show	= rdt_default_ctrl_show,
 		.fflags		= RFTYPE_CTRL_INFO | RFTYPE_RES_CACHE,
 	},
+	{
+		.name		= "num_mbm_cntrs",
+		.mode		= 0444,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= resctrl_num_mbm_cntrs_show,
+	},
 	{
 		.name		= "min_cbm_bits",
 		.mode		= 0444,
@@ -1915,6 +1969,28 @@ static struct rftype res_common_files[] = {
 		.seq_show	= mbm_local_bytes_config_show,
 		.write		= mbm_local_bytes_config_write,
 	},
+	{
+		.name		= "event_filter",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= event_filter_show,
+		.write		= event_filter_write,
+	},
+	{
+		.name		= "mbm_L3_assignments",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= mbm_L3_assignments_show,
+		.write		= mbm_L3_assignments_write,
+	},
+	{
+		.name		= "mbm_assign_mode",
+		.mode		= 0644,
+		.kf_ops		= &rdtgroup_kf_single_ops,
+		.seq_show	= resctrl_mbm_assign_mode_show,
+		.write		= resctrl_mbm_assign_mode_write,
+		.fflags		= RFTYPE_MON_INFO | RFTYPE_RES_CACHE,
+	},
 	{
 		.name		= "cpus",
 		.mode		= 0644,
@@ -2168,10 +2244,48 @@ int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name,
 	return ret;
 }

+static int resctrl_mkdir_event_configs(struct rdt_resource *r, struct kernfs_node *l3_mon_kn)
+{
+	struct kernfs_node *kn_subdir, *kn_subdir2;
+	struct mon_evt *mevt;
+	int ret;
+
+	kn_subdir = kernfs_create_dir(l3_mon_kn, "event_configs", l3_mon_kn->mode, NULL);
+	if (IS_ERR(kn_subdir))
+		return PTR_ERR(kn_subdir);
+
+	ret = rdtgroup_kn_set_ugid(kn_subdir);
+	if (ret)
+		return ret;
+
+	for_each_mon_event(mevt) {
+		if (mevt->rid != r->rid || !mevt->enabled || !resctrl_is_mbm_event(mevt->evtid))
+			continue;
+
+		kn_subdir2 = kernfs_create_dir(kn_subdir, mevt->name, kn_subdir->mode, mevt);
+		if (IS_ERR(kn_subdir2)) {
+			ret = PTR_ERR(kn_subdir2);
+			goto out;
+		}
+
+		ret = rdtgroup_kn_set_ugid(kn_subdir2);
+		if (ret)
+			goto out;
+
+		ret = rdtgroup_add_files(kn_subdir2, RFTYPE_ASSIGN_CONFIG);
+		if (ret)
+			break;
+	}
+
+out:
+	return ret;
+}
+
 static int rdtgroup_mkdir_info_resdir(void *priv, char *name,
 				      unsigned long fflags)
 {
 	struct kernfs_node *kn_subdir;
+	struct rdt_resource *r;
 	int ret;

 	kn_subdir = kernfs_create_dir(kn_info, name,
@@ -2184,7 +2298,24 @@ static int rdtgroup_mkdir_info_resdir(void *priv, char *name,
 		return ret;

 	ret = rdtgroup_add_files(kn_subdir, fflags);
-	if (!ret)
+	if (ret)
+		return ret;
+
+	if ((fflags & RFTYPE_MON_INFO) == RFTYPE_MON_INFO) {
+		r = priv;
+		if (r->mon.mbm_cntr_assignable) {
+			ret = resctrl_mkdir_event_configs(r, kn_subdir);
+			if (ret)
+				return ret;
+			/*
+			 * Hide BMEC related files if mbm_event mode
+			 * is enabled.
+			 */
+			if (resctrl_arch_mbm_cntr_assign_enabled(r))
+				resctrl_bmec_files_show(r, kn_subdir, false);
+		}
+	}
+
 	kernfs_activate(kn_subdir);

 	return ret;
@@ -2608,10 +2739,8 @@ 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)
@@ -2637,6 +2766,8 @@ static int rdt_get_tree(struct fs_context *fc)
 		if (ret < 0)
 			goto out_info;

+		rdtgroup_assign_cntrs(&rdtgroup_default);
+
 		ret = mkdir_mondata_all(rdtgroup_default.kn,
 					&rdtgroup_default, &kn_mondata);
 		if (ret < 0)
@@ -2675,15 +2806,16 @@ out_mondata:
 	if (resctrl_arch_mon_capable())
 		kernfs_remove(kn_mondata);
 out_mongrp:
-	if (resctrl_arch_mon_capable())
+	if (resctrl_arch_mon_capable()) {
+		rdtgroup_unassign_cntrs(&rdtgroup_default);
 		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();
@@ -2822,6 +2954,7 @@ static void free_all_child_rdtgrp(struct rdtgroup *rdtgrp)

 	head = &rdtgrp->mon.crdtgrp_list;
 	list_for_each_entry_safe(sentry, stmp, head, mon.crdtgrp_list) {
+		rdtgroup_unassign_cntrs(sentry);
 		free_rmid(sentry->closid, sentry->mon.rmid);
 		list_del(&sentry->mon.crdtgrp_list);

@@ -2862,6 +2995,8 @@ static void rmdir_all_sub(void)
 		cpumask_or(&rdtgroup_default.cpu_mask,
 			   &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask);

+		rdtgroup_unassign_cntrs(rdtgrp);
+
 		free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);

 		kernfs_remove(rdtgrp->kn);
@@ -2946,6 +3081,7 @@ static void resctrl_fs_teardown(void)
 		return;

 	rmdir_all_sub();
+	rdtgroup_unassign_cntrs(&rdtgroup_default);
 	mon_put_kn_priv();
 	rdt_pseudo_lock_release();
 	rdtgroup_default.mode = RDT_MODE_SHAREABLE;
@@ -3057,10 +3193,9 @@ static int mon_add_all_files(struct kernfs_node *kn, struct rdt_mon_domain *d,
 	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) {
+	for_each_mon_event(mevt) {
+		if (mevt->rid != r->rid || !mevt->enabled)
+			continue;
 		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))
@@ -3427,9 +3562,12 @@ static int mkdir_rdt_prepare_rmid_alloc(struct rdtgroup *rdtgrp)
 	}
 	rdtgrp->mon.rmid = ret;

+	rdtgroup_assign_cntrs(rdtgrp);
+
 	ret = mkdir_mondata_all(rdtgrp->kn, rdtgrp, &rdtgrp->mon.mon_data_kn);
 	if (ret) {
 		rdt_last_cmd_puts("kernfs subdir error\n");
+		rdtgroup_unassign_cntrs(rdtgrp);
 		free_rmid(rdtgrp->closid, rdtgrp->mon.rmid);
 		return ret;
 	}
@@ -3439,9 +3577,11 @@ static int mkdir_rdt_prepare_rmid_alloc(struct rdtgroup *rdtgrp)

 static void mkdir_rdt_prepare_rmid_free(struct rdtgroup *rgrp)
 {
-	if (resctrl_arch_mon_capable())
+	if (resctrl_arch_mon_capable()) {
+		rdtgroup_unassign_cntrs(rgrp);
 		free_rmid(rgrp->closid, rgrp->mon.rmid);
 	}
+}

 /*
 * We allow creating mon groups only with in a directory called "mon_groups"
@@ -3716,6 +3856,9 @@ 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);

 	/*
@@ -3763,6 +3906,8 @@ 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);

@@ -4022,9 +4167,14 @@ static void rdtgroup_setup_default(void)

 static void domain_destroy_mon_state(struct rdt_mon_domain *d)
 {
+	int idx;
+
+	kfree(d->cntr_cfg);
 	bitmap_free(d->rmid_busy_llc);
-	kfree(d->mbm_total);
-	kfree(d->mbm_local);
+	for_each_mbm_idx(idx) {
+		kfree(d->mbm_states[idx]);
+		d->mbm_states[idx] = NULL;
+	}
 }

 void resctrl_offline_ctrl_domain(struct rdt_resource *r, struct rdt_ctrl_domain *d)
@@ -4050,7 +4200,7 @@ void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d

 	if (resctrl_is_mbm_enabled())
 		cancel_delayed_work(&d->mbm_over);
-	if (resctrl_arch_is_llc_occupancy_enabled() && has_busy_rmid(d)) {
+	if (resctrl_is_mon_event_enabled(QOS_L3_OCCUP_EVENT_ID) && has_busy_rmid(d)) {
 		/*
 		 * When a package is going down, forcefully
 		 * decrement rmid->ebusy. There is no way to know
@@ -4084,32 +4234,41 @@ void resctrl_offline_mon_domain(struct rdt_resource *r, struct rdt_mon_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;
+	size_t tsize = sizeof(*d->mbm_states[0]);
+	enum resctrl_event_id eventid;
+	int idx;

-	if (resctrl_arch_is_llc_occupancy_enabled()) {
+	if (resctrl_is_mon_event_enabled(QOS_L3_OCCUP_EVENT_ID)) {
 		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;
+
+	for_each_mbm_event_id(eventid) {
+		if (!resctrl_is_mon_event_enabled(eventid))
+			continue;
+		idx = MBM_STATE_IDX(eventid);
+		d->mbm_states[idx] = kcalloc(idx_limit, tsize, GFP_KERNEL);
+		if (!d->mbm_states[idx])
+			goto cleanup;
 	}
+
+	if (resctrl_is_mbm_enabled() && r->mon.mbm_cntr_assignable) {
+		tsize = sizeof(*d->cntr_cfg);
+		d->cntr_cfg = kcalloc(r->mon.num_mbm_cntrs, tsize, GFP_KERNEL);
+		if (!d->cntr_cfg)
+			goto cleanup;
 	}

 	return 0;
+cleanup:
+	bitmap_free(d->rmid_busy_llc);
+	for_each_mbm_idx(idx) {
+		kfree(d->mbm_states[idx]);
+		d->mbm_states[idx] = NULL;
+	}
+
+	return -ENOMEM;
 }

 int resctrl_online_ctrl_domain(struct rdt_resource *r, struct rdt_ctrl_domain *d)
@@ -4144,7 +4303,7 @@ int resctrl_online_mon_domain(struct rdt_resource *r, struct rdt_mon_domain *d)
 					   RESCTRL_PICK_ANY_CPU);
 	}

-	if (resctrl_arch_is_llc_occupancy_enabled())
+	if (resctrl_is_mon_event_enabled(QOS_L3_OCCUP_EVENT_ID))
 		INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo);

 	/*
@@ -4219,7 +4378,7 @@ void resctrl_offline_cpu(unsigned int cpu)
 			cancel_delayed_work(&d->mbm_over);
 			mbm_setup_overflow_handler(d, 0, cpu);
 		}
-		if (resctrl_arch_is_llc_occupancy_enabled() &&
+		if (resctrl_is_mon_event_enabled(QOS_L3_OCCUP_EVENT_ID) &&
 		    cpu == d->cqm_work_cpu && has_busy_rmid(d)) {
 			cancel_delayed_work(&d->cqm_limbo);
 			cqm_setup_limbo_handler(d, 0, cpu);
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -156,28 +156,43 @@ struct rdt_ctrl_domain {
 	u32				*mbps_val;
 };

+/**
+ * struct mbm_cntr_cfg - Assignable counter configuration.
+ * @evtid:		MBM event to which the counter is assigned. Only valid
+ *			if @rdtgroup is not NULL.
+ * @rdtgrp:		resctrl group assigned to the counter. NULL if the
+ *			counter is free.
+ */
+struct mbm_cntr_cfg {
+	enum resctrl_event_id	evtid;
+	struct rdtgroup		*rdtgrp;
+};
+
 /**
 * struct rdt_mon_domain - group of CPUs sharing a resctrl monitor resource
 * @hdr:		common header for different domain types
 * @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
+ * @mbm_states:		Per-event pointer to the MBM event's saved state.
+ *			An MBM event's state is an array of struct mbm_state
+ *			indexed by RMID on x86 or combined CLOSID, RMID on Arm.
 * @mbm_over:		worker to periodically read MBM h/w counters
 * @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
+ * @cntr_cfg:		array of assignable counters' configuration (indexed
+ *			by counter ID)
 */
 struct rdt_mon_domain {
 	struct rdt_domain_hdr		hdr;
 	unsigned int			ci_id;
 	unsigned long			*rmid_busy_llc;
-	struct mbm_state		*mbm_total;
-	struct mbm_state		*mbm_local;
+	struct mbm_state		*mbm_states[QOS_NUM_L3_MBM_EVENTS];
 	struct delayed_work		mbm_over;
 	struct delayed_work		cqm_limbo;
 	int				mbm_work_cpu;
 	int				cqm_work_cpu;
+	struct mbm_cntr_cfg		*cntr_cfg;
 };

 /**
@@ -255,40 +270,53 @@ enum resctrl_schema_fmt {
 	RESCTRL_SCHEMA_RANGE,
 };

+/**
+ * struct resctrl_mon - Monitoring related data of a resctrl resource.
+ * @num_rmid:		Number of RMIDs available.
+ * @mbm_cfg_mask:	Memory transactions that can be tracked when bandwidth
+ *			monitoring events can be configured.
+ * @num_mbm_cntrs:	Number of assignable counters.
+ * @mbm_cntr_assignable:Is system capable of supporting counter assignment?
+ * @mbm_assign_on_mkdir:True if counters should automatically be assigned to MBM
+ *			events of monitor groups created via mkdir.
+ */
+struct resctrl_mon {
+	int			num_rmid;
+	unsigned int		mbm_cfg_mask;
+	int			num_mbm_cntrs;
+	bool			mbm_cntr_assignable;
+	bool			mbm_assign_on_mkdir;
+};
+
 /**
 * 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
 * @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.
+ * @mon:		Monitoring related data.
 * @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.
 * @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 {
 	int			rid;
 	bool			alloc_capable;
 	bool			mon_capable;
-	int			num_rmid;
 	enum resctrl_scope	ctrl_scope;
 	enum resctrl_scope	mon_scope;
 	struct resctrl_cache	cache;
 	struct resctrl_membw	membw;
+	struct resctrl_mon	mon;
 	struct list_head	ctrl_domains;
 	struct list_head	mon_domains;
 	char			*name;
 	enum resctrl_schema_fmt	schema_fmt;
-	struct list_head	evt_list;
-	unsigned int		mbm_cfg_mask;
 	bool			cdp_capable;
 };

@@ -372,8 +400,29 @@ 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);

+void resctrl_enable_mon_event(enum resctrl_event_id eventid);
+
+bool resctrl_is_mon_event_enabled(enum resctrl_event_id eventid);
+
 bool resctrl_arch_is_evt_configurable(enum resctrl_event_id evt);

+static inline bool resctrl_is_mbm_event(enum resctrl_event_id eventid)
+{
+	return (eventid >= QOS_L3_MBM_TOTAL_EVENT_ID &&
+		eventid <= QOS_L3_MBM_LOCAL_EVENT_ID);
+}
+
+u32 resctrl_get_mon_evt_cfg(enum resctrl_event_id eventid);
+
+/* Iterate over all memory bandwidth events */
+#define for_each_mbm_event_id(eventid)				\
+	for (eventid = QOS_L3_MBM_TOTAL_EVENT_ID;		\
+	     eventid <= QOS_L3_MBM_LOCAL_EVENT_ID; eventid++)
+
+/* Iterate over memory bandwidth arrays in domain structures */
+#define for_each_mbm_idx(idx)					\
+	for (idx = 0; idx < QOS_NUM_L3_MBM_EVENTS; idx++)
+
 /**
 * resctrl_arch_mon_event_config_write() - Write the config for an event.
 * @config_info: struct resctrl_mon_config_info describing the resource, domain
@@ -416,6 +465,26 @@ 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);

+/**
+ * resctrl_arch_mbm_cntr_assign_enabled() - Check if MBM counter assignment
+ *					    mode is enabled.
+ * @r:		Pointer to the resource structure.
+ *
+ * Return:
+ * true if the assignment mode is enabled, false otherwise.
+ */
+bool resctrl_arch_mbm_cntr_assign_enabled(struct rdt_resource *r);
+
+/**
+ * resctrl_arch_mbm_cntr_assign_set() - Configure the MBM counter assignment mode.
+ * @r:		Pointer to the resource structure.
+ * @enable:	Set to true to enable, false to disable the assignment mode.
+ *
+ * Return:
+ * 0 on success, < 0 on error.
+ */
+int resctrl_arch_mbm_cntr_assign_set(struct rdt_resource *r, bool enable);
+
 /*
 * Update the ctrl_val and apply this config right now.
 * Must be called on one of the domain's CPUs.
@@ -528,6 +597,63 @@ void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_mon_domain *
 */
 void resctrl_arch_reset_all_ctrls(struct rdt_resource *r);

+/**
+ * resctrl_arch_config_cntr() - Configure the counter with its new RMID
+ *				and event details.
+ * @r:			Resource structure.
+ * @d:			The domain in which counter with ID @cntr_id should be configured.
+ * @evtid:		Monitoring event type (e.g., QOS_L3_MBM_TOTAL_EVENT_ID
+ *			or QOS_L3_MBM_LOCAL_EVENT_ID).
+ * @rmid:		RMID.
+ * @closid:		CLOSID.
+ * @cntr_id:		Counter ID to configure.
+ * @assign:		True to assign the counter or update an existing assignment,
+ *			false to unassign the counter.
+ *
+ * This can be called from any CPU.
+ */
+void resctrl_arch_config_cntr(struct rdt_resource *r, struct rdt_mon_domain *d,
+			      enum resctrl_event_id evtid, u32 rmid, u32 closid,
+			      u32 cntr_id, bool assign);
+
+/**
+ * resctrl_arch_cntr_read() - Read the event data corresponding to the counter ID
+ *			      assigned to the RMID, event pair for this resource
+ *			      and domain.
+ * @r:		Resource that the counter should be read from.
+ * @d:		Domain that the counter should be read from.
+ * @closid:	CLOSID that matches the RMID.
+ * @rmid:	The RMID to which @cntr_id is assigned.
+ * @cntr_id:	The counter to read.
+ * @eventid:	The MBM event to which @cntr_id is assigned.
+ * @val:	Result of the counter read in bytes.
+ *
+ * Called on a CPU that belongs to domain @d when "mbm_event" mode is enabled.
+ * Called from a non-migrateable process context via smp_call_on_cpu() unless all
+ * CPUs are nohz_full, in which case it is called via IPI (smp_call_function_any()).
+ *
+ * Return:
+ * 0 on success, or -EIO, -EINVAL etc on error.
+ */
+int resctrl_arch_cntr_read(struct rdt_resource *r, struct rdt_mon_domain *d,
+			   u32 closid, u32 rmid, int cntr_id,
+			   enum resctrl_event_id eventid, u64 *val);
+
+/**
+ * resctrl_arch_reset_cntr() - Reset any private state associated with counter ID.
+ * @r:		The domain's resource.
+ * @d:		The counter ID's domain.
+ * @closid:	CLOSID that matches the RMID.
+ * @rmid:	The RMID to which @cntr_id is assigned.
+ * @cntr_id:	The counter to reset.
+ * @eventid:	The MBM event to which @cntr_id is assigned.
+ *
+ * This can be called from any CPU.
+ */
+void resctrl_arch_reset_cntr(struct rdt_resource *r, struct rdt_mon_domain *d,
+			     u32 closid, u32 rmid, int cntr_id,
+			     enum resctrl_event_id eventid);
+
 extern unsigned int resctrl_rmid_realloc_threshold;
 extern unsigned int resctrl_rmid_realloc_limit;

--- a/include/linux/resctrl_types.h
+++ b/include/linux/resctrl_types.h
@@ -34,11 +34,18 @@
 /* Max event bits supported */
 #define MAX_EVT_CONFIG_BITS		GENMASK(6, 0)

+/* Number of memory transactions that an MBM event can be configured with */
+#define NUM_MBM_TRANSACTIONS		7
+
+/* Event IDs */
+enum resctrl_event_id {
+	/* Must match value of first event below */
+	QOS_FIRST_EVENT			= 0x01,
+
 	/*
- * Event IDs, the values match those used to program IA32_QM_EVTSEL before
+	 * These 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,
@@ -47,4 +54,7 @@ enum resctrl_event_id {
 	QOS_NUM_EVENTS,
 };

+#define QOS_NUM_L3_MBM_EVENTS	(QOS_L3_MBM_LOCAL_EVENT_ID - QOS_L3_MBM_TOTAL_EVENT_ID + 1)
+#define MBM_STATE_IDX(evt)	((evt) - QOS_L3_MBM_TOTAL_EVENT_ID)
+
 #endif /* __LINUX_RESCTRL_TYPES_H */