Add details of the new hv-gpci interface file called
"affinity_domain_via_virtual_processor" in the ABI documentation.
Signed-off-by: Kajol Jain <kj...@linux.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 aff52dc3b05c..3b63d66658fe 100644
--- a/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci
+++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci
@@ -144,3 +144,35 @@ Description: admin read only
more information.
* "-EFBIG" : System information exceeds PAGE_SIZE.
+
+What:
/sys/devices/hv_gpci/interface/affinity_domain_via_virtual_processor
+Date: July 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
+ AFFINITY_DOMAIN_INFORMATION_BY_VIRTUAL_PROCESSOR(0xA0).
+
+ * 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_SUCESS",
+ "H_AUTHORITY" and "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
getPerfCountInfo documentation for
+ more information.
+
+ * "-EFBIG" : System information exceeds PAGE_SIZE.
--
2.31.1
