linux-kernel - Re: [PATCH 7/7] Documentation: cpufreq: amd-pstate: introduce the new cpu boost control method

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Date: Fri, 26 Jan 2024 09:47:03 -0600
From: Mario Limonciello <mario.limonciello@....com>
To: Perry Yuan <perry.yuan@....com>, rafael.j.wysocki@...el.com,
 viresh.kumar@...aro.org, Ray.Huang@....com, gautham.shenoy@....com,
 Borislav.Petkov@....com
Cc: Alexander.Deucher@....com, Xinmei.Huang@....com, Xiaojian.Du@....com,
 Li.Meng@....com, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] Documentation: cpufreq: amd-pstate: introduce the new
 cpu boost control method

On 1/26/2024 02:08, Perry Yuan wrote:
> From: Perry Yuan <Perry.Yuan@....com>
> 
> Introduce AMD CPU frequency boosting control sysfs entry which userd for
> switching boost on and boost off.

Typo in this sentence.

> 
> 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>
> ---
>   Documentation/admin-guide/pm/amd-pstate.rst | 11 +++++++++++
>   1 file changed, 11 insertions(+)
> 
> diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
> index 1cf40f69278c..d72dc407c4db 100644
> --- a/Documentation/admin-guide/pm/amd-pstate.rst
> +++ b/Documentation/admin-guide/pm/amd-pstate.rst
> @@ -385,6 +385,17 @@ control its functionality at the system level.  They are located in the
>           to the operation mode represented by that string - or to be
>           unregistered in the "disable" case.
>   
> +``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 new attribute file which
> +        allow user to change all cores frequency boosting state. It supports both
> +        ``active mode`` and ``passive mode`` control with below value write to it.

Does it also support guided mode?

> +
> +        "0" Disable Core performance Boosting
> +        "1" Enable  Core performance Boosting
> +
>   ``cpupower`` tool support for ``amd-pstate``
>   ===============================================
>