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[04/10] docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document processor_config sysfs interface file

Message ID 20230609114001.169235-5-kjain@linux.ibm.com (mailing list archive)
State Changes Requested
Headers show
Series Add sysfs interface files to hv_gpci device to expose system information | expand

Commit Message

Kajol Jain June 9, 2023, 11:39 a.m. UTC 
Add details of the new hv-gpci interface file called
"processor_config" in the ABI documentation.

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
---
 .../sysfs-bus-event_source-devices-hv_gpci        | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
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Patch

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 6d633167268e..003d94afbbcd 100644
--- a/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci
+++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci
@@ -109,3 +109,18 @@  Description:	admin read only
 			   more information.
 
 		* "-EFBIG" : System information exceeds PAGE_SIZE.
+
+What:		/sys/devices/hv_gpci/interface/processor_config
+Date:		June 2023
+Contact:	Linux on PowerPC Developer List <linuxppc-dev@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
+		PROCESSOR_CONFIG(0x90).
+		* 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
+		  PROCESSOR_CONFIG 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.