[PATCH V2 2/2] docs: ABI: sysfs-bus-event_source-devices: Document sysfs caps entry for PMU

Athira Rajeev
2022-05-18T08:56:11Z

Add ABI documentation for "caps" attribute group.
Some of the platform specific PMU features can be exposed
in "caps" attribute group/directory:
/sys/bus/event_source/devices/<dev>/

Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
---
.../sysfs-bus-event_source-devices-caps | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-bus-event_source-devices-caps

diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices-caps b/Documentation/ABI/testing/sysfs-bus-event_source-devices-caps
new file mode 100644
index 000000000000..ef5f537bdd83
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-caps
@@ -0,0 +1,18 @@
+What: /sys/bus/event_source/devices/<dev>/caps
+Date: May 2022
+KernelVersion: 5.19
+Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
+Description:
+ Attribute group to describe the capabilities exposed
+ for a particular pmu. Each attribute of this group can
+ expose information specific to a PMU, say pmu_name, so that
+ userspace can understand some of the feature which the
+ platform specific PMU supports.
+
+ One of the example available capability in supported platform
+ like Intel is pmu_name, which exposes underlying CPU name known
+ to the PMU driver.
+
+ Example output in powerpc:
+ grep -H . /sys/bus/event_source/devices/cpu/caps/*
+ /sys/bus/event_source/devices/cpu/caps/pmu_name:POWER9
--
2.31.1