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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Aug 2024 22:01:37.2867 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c34da4bb-1c46-422a-e48f-08dcb66357f7 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: SN1PEPF000397B1.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ1PR12MB6147 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 counters supported. Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537 Signed-off-by: Babu Moger --- 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_abmc. 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 | 12 ++++++++++++ include/linux/resctrl.h | 4 ++++ 2 files changed, 16 insertions(+) diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c index 795fe91a8feb..88312b5f0069 100644 --- a/arch/x86/kernel/cpu/resctrl/monitor.c +++ b/arch/x86/kernel/cpu/resctrl/monitor.c @@ -1229,6 +1229,18 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r) mbm_local_event.configurable = true; mbm_config_rftype_init("mbm_local_bytes_config"); } + + 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; + } } l3_mon_evt_init(r); diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h index 1097559f4987..72c498deeb5e 100644 --- a/include/linux/resctrl.h +++ b/include/linux/resctrl.h @@ -185,10 +185,14 @@ enum resctrl_scope { /** * 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; }; -- 2.34.1