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authorKan Liang <[email protected]>2020-10-01 14:17:11 -0700
committerPeter Zijlstra <[email protected]>2020-10-03 16:30:56 +0200
commit80a5ce116fc084e8a25d5a936617699e2931b611 (patch)
tree20b77a33768ba881e9d9522171b8481263edcb97 /tools/perf/scripts/python/exported-sql-viewer.py
parent010cb00265f150bf82b23c02ad1fb87ce5c781e1 (diff)
perf/x86/intel: Check perf metrics feature for each CPU
It might be possible that different CPUs have different CPU metrics on a platform. In this case, writing the GLOBAL_CTRL_EN_PERF_METRICS bit to the GLOBAL_CTRL register of a CPU, which doesn't support the TopDown perf metrics feature, causes MSR access error. Current TopDown perf metrics feature is enumerated using the boot CPU's PERF_CAPABILITIES MSR. The MSR only indicates the boot CPU supports this feature. Check the PERF_CAPABILITIES MSR for each CPU. If any CPU doesn't support the perf metrics feature, disable the feature globally. Fixes: 59a854e2f3b9 ("perf/x86/intel: Support TopDown metrics on Ice Lake") Signed-off-by: Kan Liang <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Link: https://lkml.kernel.org/r/[email protected]
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