perf/x86/rapl: Add msr mask support

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In some cases, when probing a perf MSR, we're probing certain bits of the
MSR instead of the whole register, thus only these bits should be checked.

For example, for RAPL ENERGY_STATUS MSR, only the lower 32 bits represents
the energy counter, and the higher 32bits are reserved.

Introduce a new mask field in struct perf_msr to allow probing certain
bits of a MSR.

This change is transparent to the current perf_msr_probe() users.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Link: https://lkml.kernel.org/r/20210204161816.12649-1-rui.zhang@intel.com

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Zhang Rui 2021-02-05 00:18:14 +08:00 • committed by Peter Zijlstra

parent b3c3361fe3

commit ffb20c2e52

2 changed files with 10 additions and 4 deletions

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arch/x86/events/probe.c

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7

arch/x86/events/probe.h

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