1What:		/sys/bus/event_source/devices/<dev>/caps
 2Date:		May 2022
 3KernelVersion:	5.19
 4Contact:	Linux kernel mailing list <linux-kernel@vger.kernel.org>
 5Description:
 6		Attribute group to describe the capabilities exposed
 7		for a particular pmu. Each attribute of this group can
 8		expose information specific to a PMU, say pmu_name, so that
 9		userspace can understand some of the feature which the
10		platform specific PMU supports.
11
12		One of the example available capability in supported platform
13		like Intel is pmu_name, which exposes underlying CPU name known
14		to the PMU driver.
15
16		Example output in powerpc:
17		grep . /sys/bus/event_source/devices/cpu/caps/*
18		/sys/bus/event_source/devices/cpu/caps/pmu_name:POWER9
19
20		The "branch_counter_nr" in the supported platform exposes the
21		maximum number of counters which can be shown in the u64 counters
22		of PERF_SAMPLE_BRANCH_COUNTERS, while the "branch_counter_width"
23		exposes the width of each counter. Both of them can be used by
24		the perf tool to parse the logged counters in each branch.