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

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Message-Id: <20220518085502.6914-2-atrajeev@linux.vnet.ibm.com>
Date:   Wed, 18 May 2022 14:25:02 +0530
From:   Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
To:     acme@...nel.org, jolsa@...nel.org, mpe@...erman.id.au
Cc:     linux-perf-users@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, maddy@...ux.vnet.ibm.com,
        rnsastry@...ux.ibm.com, kjain@...ux.ibm.com,
        disgoel@...ux.vnet.ibm.com, irogers@...gle.com
Subject: [PATCH V2 2/2] docs: ABI: sysfs-bus-event_source-devices: Document sysfs caps entry for PMU

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@...ux.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@...r.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