perf/amd/ibs: Add PMU specific minimum period

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0x10 is the minimum sample period for IBS Fetch and 0x90 for IBS Op.
Current IBS PMU driver uses 0x10 for both the PMUs, which is incorrect.
Fix it by adding PMU specific minimum period values in struct perf_ibs.

Also, bail out opening a 'sample period mode' event if the user requested
sample period is less than PMU supported minimum value. For a 'freq mode'
event, start calibrating sample period from PMU specific minimum period.

Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/r/20250115054438.1021-7-ravi.bangoria@amd.com

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Ravi Bangoria 2025-01-15 05:44:35 +00:00 • committed by Peter Zijlstra

parent e1e7844ced

commit b2fc7b282b

1 changed files with 16 additions and 8 deletions

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arch/x86/events/amd/ibs.c

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