[PATCH 08/11] arm64: pmu: Provide cpumask attribute for PMU
From: Jeremy Linton <hidden>
Date: 2016-06-21 17:11:46
Also in:
linux-acpi
Subsystem:
arm pmu profiling and debugging, arm64 port (aarch64 architecture), performance events subsystem, the rest · Maintainers:
Will Deacon, Mark Rutland, Catalin Marinas, Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds
With heterogeneous PMUs its helpful to know which PMUs are bound to each CPU. Provide that information with a cpumask sysfs entry similar to other PMUs. Signed-off-by: Jeremy Linton <redacted> --- arch/arm64/kernel/perf_event.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index 356fa6c..dae73ea 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c@@ -533,6 +533,26 @@ static struct attribute_group armv8_pmuv3_events_attr_group = { PMU_FORMAT_ATTR(event, "config:0-9"); +static ssize_t +cpumask_show(struct device *dev, struct device_attribute *attr, char *page) +{ + struct pmu *pmu = dev_get_drvdata(dev); + struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu); + + return cpumap_print_to_pagebuf(true, page, &cpu_pmu->supported_cpus); +} +static DEVICE_ATTR_RO(cpumask); + +static struct attribute *armv8_pmuv3_attrs[] = { + &dev_attr_cpumask.attr, + NULL, +}; + +static struct attribute_group armv8_pmuv3_attr_group = { + .attrs = armv8_pmuv3_attrs, +}; + + static struct attribute *armv8_pmuv3_format_attrs[] = { &format_attr_event.attr, NULL,
@@ -544,6 +564,7 @@ static struct attribute_group armv8_pmuv3_format_attr_group = { }; static const struct attribute_group *armv8_pmuv3_attr_groups[] = { + &armv8_pmuv3_attr_group, &armv8_pmuv3_events_attr_group, &armv8_pmuv3_format_attr_group, NULL,
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2.5.5