arm: perf: treat PMUs as CPU affine

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In multi-cluster systems, the PMUs can be different across clusters, and
so our logical PMU may not be able to schedule events on all CPUs.

This patch adds a cpumask to encode which CPUs a PMU driver supports
controlling events for, and limits the driver to scheduling events on
those CPUs, and enabling and disabling the physical PMUs on those CPUs.
The cpumask is built based on the interrupt-affinity property, and in
the absence of such a property a homogenous system is assumed.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Mark Rutland 2015-05-13 17:12:25 +01:00 • committed by Will Deacon

parent 64d0d3943e

commit cc88116da0

3 changed files with 38 additions and 3 deletions

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1

arch/arm/include/asm/pmu.h

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25

arch/arm/kernel/perf_event.c

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15

arch/arm/kernel/perf_event_cpu.c

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