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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 May 2025 22:53:00.0340 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d74bfda9-9734-4866-1010-08dd94033de6 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN1PEPF00004684.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6305 Content-Type: text/plain; charset="utf-8" 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 feature details are documented in APM listed below [1]. [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 monitoring counters supported. Link: https://bugzilla.kernel.org/show_bug.cgi?id=3D206537 Signed-off-by: Babu Moger --- v13: No changes. v12: Resolved conflicts because of latest merge. Removed Reviewed-by as the patch has changed. v11: No changes. v10: No changes. v9: Added Reviewed-by tag. No code changes v8: Used GENMASK for the mask. v7: Removed WARN_ON for num_mbm_cntrs. Decided to dynamically allocate the bitmap. WARN_ON is not required anymore. Removed redundant comments. v6: Commit message update. Renamed abmc_capable to mbm_cntr_assignable. v5: Name change num_cntrs to num_mbm_cntrs. Moved abmc_capable to resctrl_mon. v4: Removed resctrl_arch_has_abmc(). Added all the code inline. We dont need to separate this as arch code. v3: Removed changes related to mon_features. Moved rdt_cpu_has to core.c and added new function resctrl_arch_has_abm= c. Also moved the fields mbm_assign_capable and mbm_assign_cntrs to rdt_resource. (James) v2: Changed the field name to mbm_assign_capable from abmc_capable. --- arch/x86/kernel/cpu/resctrl/monitor.c | 9 +++++++-- include/linux/resctrl.h | 4 ++++ 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/re= sctrl/monitor.c index aeb2a9283069..fd2761d9f3f7 100644 --- a/arch/x86/kernel/cpu/resctrl/monitor.c +++ b/arch/x86/kernel/cpu/resctrl/monitor.c @@ -345,6 +345,7 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r) unsigned int mbm_offset =3D boot_cpu_data.x86_cache_mbm_width_offset; struct rdt_hw_resource *hw_res =3D resctrl_to_arch_res(r); unsigned int threshold; + u32 eax, ebx, ecx, edx; =20 snc_nodes_per_l3_cache =3D snc_get_config(); =20 @@ -375,13 +376,17 @@ int __init rdt_get_mon_l3_config(struct rdt_resource = *r) resctrl_rmid_realloc_threshold =3D resctrl_arch_round_mon_val(threshold); =20 if (rdt_cpu_has(X86_FEATURE_BMEC)) { - u32 eax, ebx, ecx, edx; - /* Detect list of bandwidth sources that can be tracked */ cpuid_count(0x80000020, 3, &eax, &ebx, &ecx, &edx); r->mon.mbm_cfg_mask =3D ecx & MAX_EVT_CONFIG_BITS; } =20 + if (rdt_cpu_has(X86_FEATURE_ABMC)) { + r->mon.mbm_cntr_assignable =3D true; + cpuid_count(0x80000020, 5, &eax, &ebx, &ecx, &edx); + r->mon.num_mbm_cntrs =3D (ebx & GENMASK(15, 0)) + 1; + } + r->mon_capable =3D true; =20 return 0; diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h index 2a8fa454d3e6..065fb6e38933 100644 --- a/include/linux/resctrl.h +++ b/include/linux/resctrl.h @@ -260,11 +260,15 @@ enum resctrl_schema_fmt { * @num_rmid: Number of RMIDs available * @mbm_cfg_mask: Bandwidth sources that can be tracked when bandwidth * monitoring events can be configured. + * @num_mbm_cntrs: Number of assignable monitoring counters + * @mbm_cntr_assignable:Is system capable of supporting monitor assignment? * @evt_list: List of monitoring events */ struct resctrl_mon { int num_rmid; unsigned int mbm_cfg_mask; + int num_mbm_cntrs; + bool mbm_cntr_assignable; struct list_head evt_list; }; =20 --=20 2.34.1