Commit-ID: 1d899c0e9bc2a17895762b9457ac336cdee8e072 Gitweb: https://git.kernel.org/tip/1d899c0e9bc2a17895762b9457ac336cdee8e072 Author: Andrew Murray <[email protected]> AuthorDate: Thu, 10 Jan 2019 13:53:27 +0000 Committer: Ingo Molnar <[email protected]> CommitDate: Mon, 21 Jan 2019 11:01:22 +0100
perf/core, arch/arm: Use PERF_PMU_CAP_NO_EXCLUDE conditionally The ARM PMU driver can be used to represent a variety of ARM based PMUs. Some of these PMUs do not provide support for context exclusion, where this is the case we advertise the PERF_PMU_CAP_NO_EXCLUDE capability to ensure that perf prevents us from handling events where any exclusion flags are set. Where an ARM PMU driver has the set_event_filter function implemented, we rely on it to perform exclusion checks. At present some of these functions do not test for all of the available exclude flags. Signed-off-by: Andrew Murray <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Acked-by: Will Deacon <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Ivan Kokshaysky <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Matt Turner <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Richard Henderson <[email protected]> Cc: Russell King <[email protected]> Cc: Sascha Hauer <[email protected]> Cc: Shawn Guo <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- drivers/perf/arm_pmu.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-) diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c index d0b7dd8fb184..eec75b97e7ea 100644 --- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -356,13 +356,6 @@ static irqreturn_t armpmu_dispatch_irq(int irq, void *dev) return ret; } -static int -event_requires_mode_exclusion(struct perf_event_attr *attr) -{ - return attr->exclude_idle || attr->exclude_user || - attr->exclude_kernel || attr->exclude_hv; -} - static int __hw_perf_event_init(struct perf_event *event) { @@ -393,9 +386,8 @@ __hw_perf_event_init(struct perf_event *event) /* * Check whether we need to exclude the counter from certain modes. */ - if ((!armpmu->set_event_filter || - armpmu->set_event_filter(hwc, &event->attr)) && - event_requires_mode_exclusion(&event->attr)) { + if (armpmu->set_event_filter && + armpmu->set_event_filter(hwc, &event->attr)) { pr_debug("ARM performance counters do not support " "mode exclusion\n"); return -EOPNOTSUPP; @@ -867,6 +859,9 @@ int armpmu_register(struct arm_pmu *pmu) if (ret) return ret; + if (!pmu->set_event_filter) + pmu->pmu.capabilities |= PERF_PMU_CAP_NO_EXCLUDE; + ret = perf_pmu_register(&pmu->pmu, pmu->name, -1); if (ret) goto out_destroy;
