linux-kernel - [PATCH v4 02/10] docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document processor_bus

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Message-Id: <20230729073455.7918-3-kjain@linux.ibm.com>
Date:   Sat, 29 Jul 2023 13:04:47 +0530
From:   Kajol Jain <kjain@...ux.ibm.com>
To:     mpe@...erman.id.au
Cc:     linuxppc-dev@...ts.ozlabs.org, maddy@...ux.ibm.com,
        atrajeev@...ux.vnet.ibm.com, disgoel@...ux.ibm.com,
        kjain@...ux.ibm.com, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, rdunlap@...radead.org
Subject: [PATCH v4 02/10] docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document processor_bus_topology sysfs interface file

Add details of the new hv-gpci interface file called
"processor_bus_topology" in the ABI documentation.

Reviewed-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
Signed-off-by: Kajol Jain <kjain@...ux.ibm.com>
---
 .../sysfs-bus-event_source-devices-hv_gpci    | 32 +++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci b/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci
index 12e2bf92783f..ba3f9aa3d68e 100644
--- a/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci
+++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci
@@ -80,3 +80,35 @@ Contact:	Linux on PowerPC Developer List <linuxppc-dev@...ts.ozlabs.org>
 Description:	read only
 		This sysfs file exposes the cpumask which is designated to make
 		HCALLs to retrieve hv-gpci pmu event counter data.
+
+What:		/sys/devices/hv_gpci/interface/processor_bus_topology
+Date:		July 2023
+Contact:	Linux on PowerPC Developer List <linuxppc-dev@...ts.ozlabs.org>
+Description:	admin read only
+		This sysfs file exposes the system topology information by making HCALL
+		H_GET_PERF_COUNTER_INFO. The HCALL is made with counter request value
+		PROCESSOR_BUS_TOPOLOGY(0xD0).
+
+		* This sysfs file will be created only for power10 and above platforms.
+
+		* User needs root privileges to read data from this sysfs file.
+
+		* This sysfs file will be created, only when the HCALL returns "H_SUCCESS",
+		  "H_AUTHORITY" or "H_PARAMETER" as the return type.
+
+		  HCALL with return error type "H_AUTHORITY" can be resolved during
+		  runtime by setting "Enable Performance Information Collection" option.
+
+		* The end user reading this sysfs file must decode the content as per
+		  underlying platform/firmware.
+
+		Possible error codes while reading this sysfs file:
+
+		* "-EPERM" : Partition is not permitted to retrieve performance information,
+			    required to set "Enable Performance Information Collection" option.
+
+		* "-EIO" : Can't retrieve system information because of invalid buffer length/invalid address
+			   or because of some hardware error. Refer to getPerfCountInfo documentation for
+			   more information.
+
+		* "-EFBIG" : System information exceeds PAGE_SIZE.
-- 
2.39.3