linux-kernel - Re: [PATCH] Documentation: admin-guide: pm: Add Out of Band mode

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Message-ID: <871qwkb0rn.fsf@meer.lwn.net>
Date:   Mon, 23 May 2022 11:46:04 -0600
From:   Jonathan Corbet <corbet@....net>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        rafael@...nel.org, hdegoede@...hat.com, markgross@...nel.org
Cc:     lenb@...nel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-doc@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, prarit@...hat.com,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: Re: [PATCH] Documentation: admin-guide: pm: Add Out of Band mode

Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com> writes:

> Update documentation for using the tool to support performance level
> change via OOB (Out of Band) interface.
>
> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> ---
>  .../admin-guide/pm/intel-speed-select.rst     | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>
> diff --git a/Documentation/admin-guide/pm/intel-speed-select.rst b/Documentation/admin-guide/pm/intel-speed-select.rst
> index 0a1fbdb54bfe..4146a2da35ea 100644
> --- a/Documentation/admin-guide/pm/intel-speed-select.rst
> +++ b/Documentation/admin-guide/pm/intel-speed-select.rst
> @@ -262,6 +262,25 @@ Which shows that the base frequency now increased from 2600 MHz at performance
>  level 0 to 2800 MHz at performance level 4. As a result, any workload, which can
>  use fewer CPUs, can see a boost of 200 MHz compared to performance level 0.
>  
> +Changing performance level via BMC Interface
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +It is possible to change SST-PP level using out of band (OOB) agent (Via some
> +remote management console, through BMC "Baseboard Management Controller"
> +interface). This mode is supported from the Sapphire Rapids processor
> +generation. The kernel and tool change to support this mode is added to Linux
> +kernel version 5.18. To enable this feature, kernel config
> +"CONFIG_INTEL_HFI_THERMAL" is required. The minimum version of the tool
> +is "v1.12" to support this feature, which is part of Linux kernel version 5.18.
> +
> +To support such configuration, this tool can be used as a daemon. Add
> +a command line option --oob::
> +
> +# intel-speed-select --oob
> +

This suggests you haven't actually built the documentation with your
change and verified that you got the result you were after.  Literal
blocks need to be indented.

Thanks,

jon