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arm64: perf: Reject stand-alone CHAIN events for PMUv3

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It doesn't make sense for a perf event to be configured as a CHAIN event
in isolation, so extend the arm_pmu structure with a ->filter_match()
function to allow the backend PMU implementation to reject CHAIN events
early.

Cc: <stable@vger.kernel.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon
2018-10-05 13:24:36 +01:00
parent d91680e687
commit ca2b497253
3 changed files with 15 additions and 1 deletions
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8
drivers/perf/arm_pmu.c
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@@ -485,7 +485,13 @@ static int armpmu_filter_match(struct perf_event *event)
{
struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
unsigned int cpu = smp_processor_id();
return cpumask_test_cpu(cpu, &armpmu->supported_cpus);
int ret;
ret = cpumask_test_cpu(cpu, &armpmu->supported_cpus);
if (ret && armpmu->filter_match)
return armpmu->filter_match(event);
return ret;
}
static ssize_t armpmu_cpumask_show(struct device *dev,