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Message-ID: <38d8820d-4ca0-0bf1-b707-94b850b08241@infradead.org>
Date: Tue, 11 Jul 2023 13:56:15 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Kajol Jain <kjain@...ux.ibm.com>, mpe@...erman.id.au
Cc: linuxppc-dev@...ts.ozlabs.org, maddy@...ux.ibm.com,
atrajeev@...ux.vnet.ibm.com, disgoel@...ux.ibm.com,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/10] docs: ABI:
sysfs-bus-event_source-devices-hv_gpci: Document
affinity_domain_via_virtual_processor sysfs interface file
Hi--
On 7/10/23 02:27, Kajol Jain wrote:
> Add details of the new hv-gpci interface file called
> "affinity_domain_via_virtual_processor" in the ABI documentation.
>
> Signed-off-by: Kajol Jain <kjain@...ux.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@...ts.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_SUCCESS
> + "H_AUTHORITY" and "H_PARAMETER" as the return type.
s/and/or/
> +
> + HCALL with return error type "H_AUTHORITY", can be resolved during
Drop the comma: ^
> + 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
Refer to
> + more information.
> +
> + * "-EFBIG" : System information exceeds PAGE_SIZE.
--
~Randy
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