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perf/smmuv3: Validate group size

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Ensure that a group will actually fit into the available counters.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Robin Murphy 2019-08-01 16:22:44 +01:00 committed by Will Deacon
parent d91cc2f46a
commit 33e84ea433
1 changed files with 14 additions and 8 deletions
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22
drivers/perf/arm_smmuv3_pmu.c
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@ -323,6 +323,7 @@ static int smmu_pmu_event_init(struct perf_event *event)
struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu);
struct device *dev = smmu_pmu->dev;
struct perf_event *sibling;
int group_num_events = 1;
u16 event_id;
if (event->attr.type != event->pmu->type)
@ -347,18 +348,23 @@ static int smmu_pmu_event_init(struct perf_event *event)
}
/* Don't allow groups with mixed PMUs, except for s/w events */
if (event->group_leader->pmu != event->pmu &&
!is_software_event(event->group_leader)) {
dev_dbg(dev, "Can't create mixed PMU group\n");
return -EINVAL;
if (!is_software_event(event->group_leader)) {
if (event->group_leader->pmu != event->pmu)
return -EINVAL;
if (++group_num_events > smmu_pmu->num_counters)
return -EINVAL;
}
for_each_sibling_event(sibling, event->group_leader) {
if (sibling->pmu != event->pmu &&
!is_software_event(sibling)) {
dev_dbg(dev, "Can't create mixed PMU group\n");
if (is_software_event(sibling))
continue;
if (sibling->pmu != event->pmu)
return -EINVAL;
if (++group_num_events > smmu_pmu->num_counters)
return -EINVAL;
}
}
hwc->idx = -1;