[PATCH 08/10] docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document affinity_domain_via_domain sysfs interface file

[Kajol Jain]

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

Signed-off-by: Kajol Jain <kjain at linux.ibm.com>
---
 .../sysfs-bus-event_source-devices-hv_gpci        | 15 +++++++++++++++
 1 file changed, 15 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 d8862808c955..1a5636ed3a4b 100644
--- a/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci
+++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci
@@ -139,3 +139,18 @@ Description:	admin read only
 		  removed, this sysfs file still be created and give error when reading it.
 		* The end user reading this sysfs file need to decode sysfs file data as per
 		  underneath platform/firmware.
+
+What:		/sys/devices/hv_gpci/interface/affinity_domain_via_domain
+Date:		June 2023
+Contact:	Linux on PowerPC Developer List <linuxppc-dev at lists.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
+		AFFINITY_DOMAIN_INFORMATION_BY_DOMAIN(0xB0).
+		* This sysfs file is only be created for power10 and above platforms.
+		* User need root access to read data from this sysfs file.
+		* Incase the HCALL fails with hardware/permission issue, or the support for
+		  AFFINITY_DOMAIN_INFORMATION_BY_DOMAIN counter request value
+		  removed, this sysfs file still be created and give error when reading it.
+		* The end user reading this sysfs file need to decode sysfs file data as per
+		  underneath platform/firmware.
-- 
2.35.3