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Message-ID: <175793566810.709179.1589165423435066287.tip-bot2@tip-bot2>
Date: Mon, 15 Sep 2025 11:27:48 -0000
From: "tip-bot2 for Babu Moger" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Babu Moger <babu.moger@....com>, "Borislav Petkov (AMD)" <bp@...en8.de>,
Reinette Chatre <reinette.chatre@...el.com>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: [tip: x86/cache] x86,fs/resctrl: Detect Assignable Bandwidth
Monitoring feature details
The following commit has been merged into the x86/cache branch of tip:
Commit-ID: 13390861b426e936db20d675804a5b405622bc79
Gitweb: https://git.kernel.org/tip/13390861b426e936db20d675804a5b405622bc79
Author: Babu Moger <babu.moger@....com>
AuthorDate: Fri, 05 Sep 2025 16:34:07 -05:00
Committer: Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Mon, 15 Sep 2025 12:08:01 +02:00
x86,fs/resctrl: Detect Assignable Bandwidth Monitoring feature details
ABMC feature details are reported via CPUID Fn8000_0020_EBX_x5.
Bits Description
15:0 MAX_ABMC Maximum Supported Assignable Bandwidth
Monitoring Counter ID + 1
The ABMC feature details are documented in APM [1] available from [2].
[1] AMD64 Architecture Programmer's Manual Volume 2: System Programming
Publication # 24593 Revision 3.41 section 19.3.3.3 Assignable Bandwidth
Monitoring (ABMC).
Detect the feature and number of assignable counters supported. For backward
compatibility, upon detecting the assignable counter feature, enable the
mbm_total_bytes and mbm_local_bytes events that users are familiar with as
part of original L3 MBM support.
Signed-off-by: Babu Moger <babu.moger@....com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Link: https://lore.kernel.org/cover.1757108044.git.babu.moger@amd.com
Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537 # [2]
---
arch/x86/kernel/cpu/resctrl/core.c | 7 +++++--
arch/x86/kernel/cpu/resctrl/monitor.c | 11 ++++++++---
fs/resctrl/monitor.c | 7 +++++++
include/linux/resctrl.h | 4 ++++
4 files changed, 24 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 267e920..2e68aa0 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -883,6 +883,8 @@ static __init bool get_rdt_mon_resources(void)
resctrl_enable_mon_event(QOS_L3_MBM_LOCAL_EVENT_ID);
ret = true;
}
+ if (rdt_cpu_has(X86_FEATURE_ABMC))
+ ret = true;
if (!ret)
return false;
@@ -978,7 +980,7 @@ 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;
@@ -990,7 +992,8 @@ 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 */
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 2558b1b..0a695ce 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -339,6 +339,7 @@ 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();
@@ -368,14 +369,18 @@ 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->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;
+ }
+
r->mon_capable = true;
return 0;
diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c
index e0dfa5f..b578451 100644
--- a/fs/resctrl/monitor.c
+++ b/fs/resctrl/monitor.c
@@ -922,6 +922,13 @@ int resctrl_mon_resource_init(void)
else if (resctrl_is_mon_event_enabled(QOS_L3_MBM_TOTAL_EVENT_ID))
mba_mbps_default_event = QOS_L3_MBM_TOTAL_EVENT_ID;
+ if (r->mon.mbm_cntr_assignable) {
+ if (!resctrl_is_mon_event_enabled(QOS_L3_MBM_TOTAL_EVENT_ID))
+ resctrl_enable_mon_event(QOS_L3_MBM_TOTAL_EVENT_ID);
+ if (!resctrl_is_mon_event_enabled(QOS_L3_MBM_LOCAL_EVENT_ID))
+ resctrl_enable_mon_event(QOS_L3_MBM_LOCAL_EVENT_ID);
+ }
+
return 0;
}
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index fe2af6c..eb80cc2 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -260,10 +260,14 @@ enum resctrl_schema_fmt {
* @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?
*/
struct resctrl_mon {
int num_rmid;
unsigned int mbm_cfg_mask;
+ int num_mbm_cntrs;
+ bool mbm_cntr_assignable;
};
/**
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