perf/x86/amd/uncore: Use rdmsr if rdpmc is unavailable

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Not all uncore PMUs may support the use of the RDPMC instruction for
reading counters. In such cases, read the count from the corresponding
PERF_CTR register using the RDMSR instruction.

Signed-off-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/e9d994e32a3fcb39fa59fcf43ab4260d11aba097.1696425185.git.sandipan.das@amd.com

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Sandipan Das 2023-10-05 10:53:13 +05:30 • committed by Peter Zijlstra

parent 07888daa05

commit 7ef0343855

1 changed files with 13 additions and 1 deletions

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arch/x86/events/amd/uncore.c

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