linux-kernel - Re: [PATCH v12 8/9] Documentation: cpufreq: amd-pstate: introduce the new cpu boost control method

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Message-ID: <a1389e59-e1e9-4280-a4a2-fd2f8050dab8@amd.com>
Date: Wed, 19 Jun 2024 14:40:57 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Perry Yuan <perry.yuan@....com>, rafael.j.wysocki@...el.com,
 viresh.kumar@...aro.org, gautham.shenoy@....com
Cc: Xinmei.Huang@....com, Xiaojian.Du@....com, Li.Meng@....com,
 linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v12 8/9] Documentation: cpufreq: amd-pstate: introduce the
 new cpu boost control method

On 6/19/2024 04:16, Perry Yuan wrote:
> From: Perry Yuan <Perry.Yuan@....com>
> 
> Introduce AMD CPU frequency boosting control sysfs entry which used for
> switching boost on and boost off.
> 
> If core performance boost is disabled while a core is in a boosted P-state,
> the core automatically transitions to the highest performance non-boosted P-state
> The highest perf and frequency will be limited by the setting value.
> 
> Signed-off-by: Perry Yuan <Perry.Yuan@....com>
> Reviewed-by: Mario Limonciello <mario.limonciello@....com>
> ---
>   Documentation/admin-guide/pm/amd-pstate.rst | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
> index 1e0d101b020a..bcc0d9404c18 100644
> --- a/Documentation/admin-guide/pm/amd-pstate.rst
> +++ b/Documentation/admin-guide/pm/amd-pstate.rst
> @@ -440,6 +440,16 @@ control its functionality at the system level.  They are located in the
>           This attribute is read-only to check the state of preferred core set
>           by the kernel parameter.
>   
> +``cpb_boost``
> +        Specifies whether core performance boost is requested to be enabled or disabled
> +        If core performance boost is disabled while a core is in a boosted P-state, the
> +        core automatically transitions to the highest performance non-boosted P-state.
> +        AMD Core Performance Boost(CPB) is controlled by this attribute file which allows
> +        user to change all cores frequency boosting state. It supports all amd-pstate modes.
> +
> +        "0" Disable Core Performance Boosting
> +        "1" Enable  Core Performance Boosting
> +

Please switch to disabled/enabled as suggested in patch 5.

>   ``cpupower`` tool support for ``amd-pstate``
>   ===============================================
>