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(parent: 21d59e3) | patch
perf/x86/amd/core: Detect available counters
authorSandipan Das <sandipan.das@amd.com>
Thu, 21 Apr 2022 05:46:56 +0000 (11:16 +0530)
committerPeter Zijlstra <peterz@infradead.org>
Wed, 4 May 2022 09:18:26 +0000 (11:18 +0200)
commit56e026a7ca3f92b8e44359e1f705febd1833f701
treecd1ae6fe5665a3a3ca8114eb1aff6b458274a641tree | snapshot
parent21d59e3e2c403c83ba196a5857d517054124168ecommit | diff
perf/x86/amd/core: Detect available counters

If AMD Performance Monitoring Version 2 (PerfMonV2) is
supported, use CPUID leaf 0x80000022 EBX to detect the
number of Core PMCs. This offers more flexibility if the
counts change in later processor families.

Signed-off-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/68a6d9688df189267db26530378870edd34f7b06.1650515382.git.sandipan.das@amd.com
arch/x86/events/amd/core.c diff | blob | history
arch/x86/include/asm/perf_event.h diff | blob | history
Domain: System / Kernel;