From 56e026a7ca3f92b8e44359e1f705febd1833f701 Mon Sep 17 00:00:00 2001 From: Sandipan Das Date: Thu, 21 Apr 2022 11:16:56 +0530 Subject: perf/x86/amd/core: Detect available counters If AMD Performance Monitoring Version 2 (PerfMonV2) is supported, use CPUID leaf 0x80000022 EBX to detect the number of Core PMCs. This offers more flexibility if the counts change in later processor families. Signed-off-by: Sandipan Das Signed-off-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/68a6d9688df189267db26530378870edd34f7b06.1650515382.git.sandipan.das@amd.com --- arch/x86/include/asm/perf_event.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'arch/x86/include/asm/perf_event.h') diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h index 8199fc5a37ea..c6cc07f46556 100644 --- a/arch/x86/include/asm/perf_event.h +++ b/arch/x86/include/asm/perf_event.h @@ -186,6 +186,18 @@ union cpuid28_ecx { unsigned int full; }; +/* + * AMD "Extended Performance Monitoring and Debug" CPUID + * detection/enumeration details: + */ +union cpuid_0x80000022_ebx { + struct { + /* Number of Core Performance Counters */ + unsigned int num_core_pmc:4; + } split; + unsigned int full; +}; + struct x86_pmu_capability { int version; int num_counters_gp; @@ -367,6 +379,11 @@ struct pebs_xmm { u64 xmm[16*2]; /* two entries for each register */ }; +/* + * AMD Extended Performance Monitoring and Debug cpuid feature detection + */ +#define EXT_PERFMON_DEBUG_FEATURES 0x80000022 + /* * IBS cpuid feature detection */ -- cgit v1.2.3