perf/x86/amd/core: Define a proper ref-cycles event for Zen 4 and later

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Add the "ref-cycles" event for AMD processors based on Zen 4 and later
microarchitectures. The backing event is based on PMCx120 which counts
cycles not in halt state in P0 frequency (same as MPERF).

Signed-off-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/089155f19f7c7e65aeb1caa727a882e2ca9b8b04.1711352180.git.sandipan.das@amd.com

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Sandipan Das 2024-03-25 13:17:54 +05:30 • committed by Ingo Molnar

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commit 68cdf1e6e8

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arch/x86/events/amd/core.c

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