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authorMark Rutland <mark.rutland@arm.com>2016-09-09 16:08:30 +0300
committerWill Deacon <will.deacon@arm.com>2016-09-09 16:51:51 +0300
commit48538b5863d8e8f8d567fc9a1d27a68623e0a0ff (patch)
treebf2feca2a3cd582ed4d0f52b16ed83e1350321f5 /drivers/perf/arm_pmu.c
parent1589680da6f7df30d8a592eebee16478f3e34a2c (diff)
downloadlinux-48538b5863d8e8f8d567fc9a1d27a68623e0a0ff.tar.xz
drivers/perf: arm_pmu: expose a cpumask in sysfs
In systems with heterogeneous CPUs, there are multiple logical CPU PMUs, each of which covers a subset of CPUs in the system. In some cases userspace needs to know which CPUs a given logical PMU covers, so we'd like to expose a cpumask under sysfs, similar to what is done for uncore PMUs. Unfortunately, prior to commit 00e727bb389359c8 ("perf stat: Balance opening and reading events"), perf stat only correctly handled a cpumask holding a single CPU, and only when profiling in system-wide mode. In other cases, the presence of a cpumask file could cause perf stat to behave erratically. Thus, exposing a cpumask file would break older perf binaries in cases where they would otherwise work. To avoid this issue while still providing userspace with the information it needs, this patch exposes a differently-named file (cpus) under sysfs. New tools can look for this and operate correctly, while older tools will not be adversely affected by its presence. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/perf/arm_pmu.c')
-rw-r--r--drivers/perf/arm_pmu.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 60c065eb638d..c36913ad3a09 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -534,6 +534,24 @@ static int armpmu_filter_match(struct perf_event *event)
return cpumask_test_cpu(cpu, &armpmu->supported_cpus);
}
+static ssize_t armpmu_cpumask_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct arm_pmu *armpmu = to_arm_pmu(dev_get_drvdata(dev));
+ return cpumap_print_to_pagebuf(true, buf, &armpmu->supported_cpus);
+}
+
+static DEVICE_ATTR(cpus, S_IRUGO, armpmu_cpumask_show, NULL);
+
+static struct attribute *armpmu_common_attrs[] = {
+ &dev_attr_cpus.attr,
+ NULL,
+};
+
+static struct attribute_group armpmu_common_attr_group = {
+ .attrs = armpmu_common_attrs,
+};
+
static void armpmu_init(struct arm_pmu *armpmu)
{
atomic_set(&armpmu->active_events, 0);
@@ -551,6 +569,8 @@ static void armpmu_init(struct arm_pmu *armpmu)
.filter_match = armpmu_filter_match,
.attr_groups = armpmu->attr_groups,
};
+ armpmu->attr_groups[ARMPMU_ATTR_GROUP_COMMON] =
+ &armpmu_common_attr_group;
}
/* Set at runtime when we know what CPU type we are. */