perf/x86/uncore: Support per PMU cpumask

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The cpumask of some uncore units, e.g., CXL uncore units, may be wrong
under some configurations. Perf may access an uncore counter of a
non-existent uncore unit.

The uncore driver assumes that all uncore units are symmetric among
dies. A global cpumask is shared among all uncore PMUs. However, some
CXL uncore units may only be available on some dies.

A per PMU cpumask is introduced to track the CPU mask of this PMU.
The driver searches the unit control RB tree to check whether the PMU is
available on a given die, and updates the per PMU cpumask accordingly.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Yunying Sun <yunying.sun@intel.com>
Link: https://lore.kernel.org/r/20240614134631.1092359-3-kan.liang@linux.intel.com

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This commit is contained in:

Kan Liang 2024-06-14 06:46:25 -07:00 • committed by Peter Zijlstra

parent 0007f39325

commit c74443d92f

4 changed files with 89 additions and 5 deletions

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31

arch/x86/events/intel/uncore.c

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2

arch/x86/events/intel/uncore.h

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58

arch/x86/events/intel/uncore_discovery.c

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arch/x86/events/intel/uncore_discovery.h

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