perf/x86/amd: Add idle hooks for branch sampling

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On AMD Fam19h Zen3, the branch sampling (BRS) feature must be disabled before
entering low power and re-enabled (if was active) when returning from low
power. Otherwise, the NMI interrupt may be held up for too long and cause
problems. Stopping BRS will cause the NMI to be delivered if it was held up.

Define a perf_amd_brs_lopwr_cb() callback to stop/restart BRS.  The callback
is protected by a jump label which is enabled only when AMD BRS is detected.
In all other cases, the callback is never called.

Signed-off-by: Stephane Eranian <eranian@google.com>
[peterz: static_call() and build fixes]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220322221517.2510440-10-eranian@google.com

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Stephane Eranian 2022-03-22 15:15:13 -07:00 • committed by Peter Zijlstra

parent 2a606a18cd

commit d5616bac7a

4 changed files with 61 additions and 0 deletions

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33

arch/x86/events/amd/brs.c

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4

arch/x86/events/amd/core.c

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1

arch/x86/events/perf_event.h

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23

arch/x86/include/asm/perf_event.h

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