diff options
| author | Kajol Jain <kjain@linux.ibm.com> | 2023-07-29 13:04:49 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-08-16 23:54:49 +1000 |
| commit | 3255171d3e861b14e4248a5c676099819cadfb6d (patch) | |
| tree | 8bcca29350e97fcbda64539afa8f208a038b525b /Documentation/ABI | |
| parent | 1a160c2a13c66c9ad47436e73c821f3d26818733 (diff) | |
docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document processor_config sysfs interface file
Add details of the new hv-gpci interface file called
"processor_config" in the ABI documentation.
Reviewed-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230729073455.7918-5-kjain@linux.ibm.com
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci | 32 |
1 files changed, 32 insertions, 0 deletions
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 ba3f9aa3d68e..9e81de18142f 100644 --- a/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci +++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci @@ -112,3 +112,35 @@ Description: admin read only more information. * "-EFBIG" : System information exceeds PAGE_SIZE. + +What: /sys/devices/hv_gpci/interface/processor_config +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 + PROCESSOR_CONFIG(0x90). + + * 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. |