ARM: perf: extend interrupt-affinity property for PPIs

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On systems containing multiple, heterogeneous clusters we need a way to
associate a PMU "device" with the CPU(s) on which it exists. For PMUs
that signal overflow with SPIs, this relationship is determined via the
"interrupt-affinity" property, which contains a list of phandles to CPU
nodes for the PMU. For PMUs using PPIs, the per-cpu nature of the
interrupt isn't enough to determine the set of CPUs which actually
contain the device.

This patch allows the interrupt-affinity property to be specified on a
PMU node irrespective of the interrupt type. For PPIs, it identifies
the set of CPUs signalling the PPI in question.

Tested-by: Stephen Boyd <sboyd@codeaurora.org> # Krait PMU
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Will Deacon 2015-06-29 13:59:01 +01:00

parent 8ae81c25cf

commit b6c084d7aa

2 changed files with 53 additions and 24 deletions

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12

Documentation/devicetree/bindings/arm/pmu.txt

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69

arch/arm/kernel/perf_event.c

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