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| author | Sandipan Das <sandipan.das@amd.com> | 2024-03-25 13:17:54 +0530 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2024-03-26 09:04:21 +0100 |
| commit | 68cdf1e6e8f2ce78ed7d8f5d80844fd75a9c54ff (patch) | |
| tree | 3dd3cefc28e3f2570b957d5c22d6ab522ff6471f /arch | |
| parent | c7b2edd8377be983442c1344cb940cd2ac21b601 (diff) | |
| download | linux-68cdf1e6e8f2ce78ed7d8f5d80844fd75a9c54ff.tar.gz | |
perf/x86/amd/core: Define a proper ref-cycles event for Zen 4 and later
Add the "ref-cycles" event for AMD processors based on Zen 4 and later
microarchitectures. The backing event is based on PMCx120 which counts
cycles not in halt state in P0 frequency (same as MPERF).
Signed-off-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/089155f19f7c7e65aeb1caa727a882e2ca9b8b04.1711352180.git.sandipan.das@amd.com
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/events/amd/core.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c index af8add6c11ea4..985ef3b479191 100644 --- a/arch/x86/events/amd/core.c +++ b/arch/x86/events/amd/core.c @@ -273,8 +273,23 @@ static const u64 amd_zen2_perfmon_event_map[PERF_COUNT_HW_MAX] = [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = 0x00a9, }; +static const u64 amd_zen4_perfmon_event_map[PERF_COUNT_HW_MAX] = +{ + [PERF_COUNT_HW_CPU_CYCLES] = 0x0076, + [PERF_COUNT_HW_INSTRUCTIONS] = 0x00c0, + [PERF_COUNT_HW_CACHE_REFERENCES] = 0xff60, + [PERF_COUNT_HW_CACHE_MISSES] = 0x0964, + [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x00c2, + [PERF_COUNT_HW_BRANCH_MISSES] = 0x00c3, + [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = 0x00a9, + [PERF_COUNT_HW_REF_CPU_CYCLES] = 0x100000120, +}; + static u64 amd_pmu_event_map(int hw_event) { + if (cpu_feature_enabled(X86_FEATURE_ZEN4) || boot_cpu_data.x86 >= 0x1a) + return amd_zen4_perfmon_event_map[hw_event]; + if (cpu_feature_enabled(X86_FEATURE_ZEN2) || boot_cpu_data.x86 >= 0x19) return amd_zen2_perfmon_event_map[hw_event]; |