linux-kernel - Re: [PATCH v3 10/11] cpufreq: amd-pstate: Add documentation for `amd_pstate_hw

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Message-ID: <53f402cb-1a0d-4b48-b92a-e968ea77a138@gmail.com>
Date: Tue, 10 Sep 2024 05:19:20 -0500
From: Russell Haley <yumpusamongus@...il.com>
To: Mario Limonciello <superm1@...nel.org>,
 "Gautham R . Shenoy" <gautham.shenoy@....com>,
 Perry Yuan <perry.yuan@....com>
Cc: Borislav Petkov <bp@...en8.de>,
 "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
 "Rafael J . Wysocki" <rafael@...nel.org>,
 "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
 <linux-kernel@...r.kernel.org>, "open list:ACPI"
 <linux-acpi@...r.kernel.org>,
 "open list:CPU FREQUENCY SCALING FRAMEWORK" <linux-pm@...r.kernel.org>,
 Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH v3 10/11] cpufreq: amd-pstate: Add documentation for
 `amd_pstate_hw_prefcore`

On 9/5/24 11:30 AM, Mario Limonciello wrote:
> From: Mario Limonciello <mario.limonciello@....com>
> 
> Explain that the sysfs file represents both preferred core being
> enabled by the user and supported by the hardware.
> 
> Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
> v2->v3:
>  * Add tag
> ---
>  Documentation/admin-guide/pm/amd-pstate.rst | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
> index e13915c540648..d5c050ea390dc 100644
> --- a/Documentation/admin-guide/pm/amd-pstate.rst
> +++ b/Documentation/admin-guide/pm/amd-pstate.rst
> @@ -263,6 +263,11 @@ lowest non-linear performance in `AMD CPPC Performance Capability
>  <perf_cap_>`_.)
>  This attribute is read-only.
>  
> +``amd_pstate_hw_prefcore``
> +
> +Whether the platform supports the preferred core feature and it has been
> +enabled. This attribute is read-only.
> +
>  ``energy_performance_available_preferences``
>  
>  A list of all the supported EPP preferences that could be used for

I notice I am confused. If the attribute is read only, how can it be
enabled by the user?