linux-kernel - [PATCH v7 4/4] docs: ABI: sysfs-bus-nvdimm: Document sysfs event format entries for nvdimm pmu

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Date:   Fri, 25 Feb 2022 20:00:24 +0530
From:   Kajol Jain <kjain@...ux.ibm.com>
To:     mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org,
        nvdimm@...ts.linux.dev, linux-kernel@...r.kernel.org,
        peterz@...radead.org, dan.j.williams@...el.com,
        ira.weiny@...el.com, vishal.l.verma@...el.com
Cc:     santosh@...six.org, maddy@...ux.ibm.com, rnsastry@...ux.ibm.com,
        aneesh.kumar@...ux.ibm.com, atrajeev@...ux.vnet.ibm.com,
        vaibhav@...ux.ibm.com, tglx@...utronix.de, kjain@...ux.ibm.com
Subject: [PATCH v7 4/4] docs: ABI: sysfs-bus-nvdimm: Document sysfs event format entries for nvdimm pmu

Details are added for the event, cpumask and format attributes
in the ABI documentation.

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Tested-by: Nageswara R Sastry <rnsastry@...ux.ibm.com>
Signed-off-by: Kajol Jain <kjain@...ux.ibm.com>
---
Changelog:
v6 -> v7
- Add Acked-by and Tested-by tag from Peter Zijlstra
  and Nageswara R Sastry.

 Documentation/ABI/testing/sysfs-bus-nvdimm | 35 ++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-nvdimm b/Documentation/ABI/testing/sysfs-bus-nvdimm
index bff84a16812a..1c1f5acbf53d 100644
--- a/Documentation/ABI/testing/sysfs-bus-nvdimm
+++ b/Documentation/ABI/testing/sysfs-bus-nvdimm
@@ -6,3 +6,38 @@ Description:
 
 The libnvdimm sub-system implements a common sysfs interface for
 platform nvdimm resources. See Documentation/driver-api/nvdimm/.
+
+What:           /sys/bus/event_source/devices/nmemX/format
+Date:           February 2022
+KernelVersion:  5.18
+Contact:        Kajol Jain <kjain@...ux.ibm.com>
+Description:	(RO) Attribute group to describe the magic bits
+		that go into perf_event_attr.config for a particular pmu.
+		(See ABI/testing/sysfs-bus-event_source-devices-format).
+
+		Each attribute under this group defines a bit range of the
+		perf_event_attr.config. Supported attribute is listed
+		below::
+		  event  = "config:0-4"  - event ID
+
+		For example::
+			ctl_res_cnt = "event=0x1"
+
+What:           /sys/bus/event_source/devices/nmemX/events
+Date:           February 2022
+KernelVersion:  5.18
+Contact:        Kajol Jain <kjain@...ux.ibm.com>
+Description:	(RO) Attribute group to describe performance monitoring events
+                for the nvdimm memory device. Each attribute in this group
+                describes a single performance monitoring event supported by
+                this nvdimm pmu.  The name of the file is the name of the event.
+                (See ABI/testing/sysfs-bus-event_source-devices-events). A
+                listing of the events supported by a given nvdimm provider type
+                can be found in Documentation/driver-api/nvdimm/$provider.
+
+What:          /sys/bus/event_source/devices/nmemX/cpumask
+Date:          February 2022
+KernelVersion:  5.18
+Contact:        Kajol Jain <kjain@...ux.ibm.com>
+Description:	(RO) This sysfs file exposes the cpumask which is designated to
+		to retrieve nvdimm pmu event counter data.
-- 
2.31.1