From: Kajol Jain <kjain@linux.ibm.com>
To: mpe@ellerman.id.au
Cc: atrajeev@linux.vnet.ibm.com, kjain@linux.ibm.com,
rdunlap@infradead.org, linux-kernel@vger.kernel.org,
linux-perf-users@vger.kernel.org, maddy@linux.ibm.com,
disgoel@linux.ibm.com, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v4 02/10] docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document processor_bus_topology sysfs interface file
Date: Sat, 29 Jul 2023 13:04:47 +0530 [thread overview]
Message-ID: <20230729073455.7918-3-kjain@linux.ibm.com> (raw)
In-Reply-To: <20230729073455.7918-1-kjain@linux.ibm.com>
Add details of the new hv-gpci interface file called
"processor_bus_topology" in the ABI documentation.
Reviewed-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Kajol Jain <kjain@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 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@lists.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@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_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
next prev parent reply other threads:[~2023-07-29 7:38 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-29 7:34 [PATCH v4 00/10] Add sysfs interface files to hv_gpci device to expose system information Kajol Jain
2023-07-29 7:34 ` [PATCH v4 01/10] powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show processor bus topology information Kajol Jain
2023-07-29 7:34 ` Kajol Jain [this message]
2023-07-29 7:34 ` [PATCH v4 03/10] powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show processor config information Kajol Jain
2023-07-29 7:34 ` [PATCH v4 04/10] docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document processor_config sysfs interface file Kajol Jain
2023-07-29 7:34 ` [PATCH v4 05/10] powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show affinity domain via virtual processor information Kajol Jain
2023-07-29 7:34 ` [PATCH v4 06/10] docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document affinity_domain_via_virtual_processor sysfs interface file Kajol Jain
2023-07-29 7:34 ` [PATCH v4 07/10] powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show affinity domain via domain information Kajol Jain
2023-07-29 7:34 ` [PATCH v4 08/10] docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document affinity_domain_via_domain sysfs interface file Kajol Jain
2023-07-29 7:34 ` [PATCH v4 09/10] powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show affinity domain via partition information Kajol Jain
2023-07-29 7:34 ` [PATCH v4 10/10] docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document affinity_domain_via_partition sysfs interface file Kajol Jain
2023-08-23 11:55 ` [PATCH v4 00/10] Add sysfs interface files to hv_gpci device to expose system information Michael Ellerman
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