diff options
| author | Stephane Eranian <eranian@google.com> | 2020-10-28 22:42:47 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-11-09 20:12:36 +0300 |
| commit | cadbaa039b99a6d5c26ce1c7f2fc0325943e605a (patch) | |
| tree | 0ecaffd56922acbfc32c955c47e120adcab22b5f /arch/x86/include/asm/perf_event.h | |
| parent | 1908dc911792067287458fdb0800f036f4f4e0f6 (diff) | |
| download | linux-cadbaa039b99a6d5c26ce1c7f2fc0325943e605a.tar.xz | |
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/include/asm/perf_event.h')
| -rw-r--r-- | arch/x86/include/asm/perf_event.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h index 6960cd6d1f23..b9a7fd0a27e2 100644 --- a/arch/x86/include/asm/perf_event.h +++ b/arch/x86/include/asm/perf_event.h @@ -137,7 +137,9 @@ union cpuid10_edx { struct { unsigned int num_counters_fixed:5; unsigned int bit_width_fixed:8; - unsigned int reserved:19; + unsigned int reserved1:2; + unsigned int anythread_deprecated:1; + unsigned int reserved2:16; } split; unsigned int full; }; |