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| author |   Stephane Eranian <eranian@google.com> | 2020-10-28 12:42:47 -0700 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2020-11-09 18:12:36 +0100 |
| commit | cadbaa039b99a6d5c26ce1c7f2fc0325943e605a (patch) | |
| tree | 0ecaffd56922acbfc32c955c47e120adcab22b5f /arch/x86/events/perf_event.h | |
| parent | perf: Tweak perf_event_attr::exclusive semantics (diff) | |
| download | linux-dev-cadbaa039b99a6d5c26ce1c7f2fc0325943e605a.tar.xz linux-dev-cadbaa039b99a6d5c26ce1c7f2fc0325943e605a.zip | |
perf/x86/intel: Make anythread filter support conditional
Starting with Arch Perfmon v5, the anythread filter on generic counters may be
deprecated. The current kernel was exporting the any filter without checking.
On Icelake, it means you could do cpu/event=0x3c,any/ even though the filter
does not exist. This patch corrects the problem by relying on the CPUID 0xa leaf
function to determine if anythread is supported or not as described in the
Intel SDM Vol3b 18.2.5.1 AnyThread Deprecation section.
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20201028194247.3160610-1-eranian@google.com
Diffstat (limited to 'arch/x86/events/perf_event.h')
| -rw-r--r-- | arch/x86/events/perf_event.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h index 1d1fe46552ba..6a8edfe59b09 100644 --- a/arch/x86/events/perf_event.h +++ b/arch/x86/events/perf_event.h @@ -585,6 +585,7 @@ union perf_capabilities { u64 pebs_baseline:1; u64 perf_metrics:1; u64 pebs_output_pt_available:1; + u64 anythread_deprecated:1; }; u64 capabilities; }; |