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authorSandipan Das <sandipan.das@amd.com>2024-03-25 08:47:54 +0100
committerIngo Molnar <mingo@kernel.org>2024-03-26 09:04:21 +0100
commit68cdf1e6e8f2ce78ed7d8f5d80844fd75a9c54ff (patch)
tree3dd3cefc28e3f2570b957d5c22d6ab522ff6471f /arch
parentperf/x86/amd/core: Update and fix stalled-cycles-* events for Zen 2 and later (diff)
downloadlinux-68cdf1e6e8f2ce78ed7d8f5d80844fd75a9c54ff.tar.xz
linux-68cdf1e6e8f2ce78ed7d8f5d80844fd75a9c54ff.zip
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.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c
index af8add6c11ea..985ef3b47919 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];