perf/x86/amd/core: Update and fix stalled-cycles-* events for Zen 2 and later

AMD processors based on Zen 2 and later microarchitectures do not
support PMCx087 (instruction pipe stalls) which is used as the backing
event for "stalled-cycles-frontend" and "stalled-cycles-backend".

Use PMCx0A9 (cycles where micro-op queue is empty) instead to count
frontend stalls and remove the entry for backend stalls since there
is no direct replacement.

Signed-off-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Ian Rogers <irogers@google.com>
Fixes: 3fe3331bb285 ("perf/x86/amd: Add event map for AMD Family 17h")
Link: https://lore.kernel.org/r/03d7fc8fa2a28f9be732116009025bdec1b3ec97.1711352180.git.sandipan.das@amd.com

diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c
index 5692e827afef39a5352354e90543099a57e66757..af8add6c11ea45739a5822cfc23ebfa269ff37b1 100644 (file)
--- a/arch/x86/events/amd/core.c
+++ b/arch/x86/events/amd/core.c
@@ -250,7 +250,7 @@ static const u64 amd_perfmon_event_map[PERF_COUNT_HW_MAX] =
 /*
  * AMD Performance Monitor Family 17h and later:
  */
-static const u64 amd_f17h_perfmon_event_map[PERF_COUNT_HW_MAX] =
+static const u64 amd_zen1_perfmon_event_map[PERF_COUNT_HW_MAX] =
 {
        [PERF_COUNT_HW_CPU_CYCLES]              = 0x0076,
        [PERF_COUNT_HW_INSTRUCTIONS]            = 0x00c0,
@@ -262,10 +262,24 @@ static const u64 amd_f17h_perfmon_event_map[PERF_COUNT_HW_MAX] =
        [PERF_COUNT_HW_STALLED_CYCLES_BACKEND]  = 0x0187,
 };
 
+static const u64 amd_zen2_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,
+};
+
 static u64 amd_pmu_event_map(int hw_event)
 {
-       if (boot_cpu_data.x86 >= 0x17)
-               return amd_f17h_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];
+
+       if (cpu_feature_enabled(X86_FEATURE_ZEN1))
+               return amd_zen1_perfmon_event_map[hw_event];
 
        return amd_perfmon_event_map[hw_event];
 }