perf/x86/amd/core: Update and fix stalled-cycles-* events for Zen 2 and later

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[ Upstream commit c7b2edd837 ]

AMD processors based on Zen 2 and later microarchitectures do not
support PMCx087 (instruction pipe stalls) which is used as the backing
event for "stalled-cycles-frontend" and "stalled-cycles-backend".

Use PMCx0A9 (cycles where micro-op queue is empty) instead to count
frontend stalls and remove the entry for backend stalls since there
is no direct replacement.

Signed-off-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Ian Rogers <irogers@google.com>
Fixes: 3fe3331bb2 ("perf/x86/amd: Add event map for AMD Family 17h")
Link: https://lore.kernel.org/r/03d7fc8fa2a28f9be732116009025bdec1b3ec97.1711352180.git.sandipan.das@amd.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Sandipan Das 2024-03-25 13:17:53 +05:30 • committed by Greg Kroah-Hartman

parent d2be2f872f

commit 69fe5f177a

1 changed files with 17 additions and 3 deletions

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arch/x86/events/amd/core.c

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