linux-kernel - Re: [PATCH V3 7/7] Documentation: introduce AMD Pstate Preferrd Core mode kernel command line options

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Message-ID: <20230824105935.qr2pbt4utegulug5@BLR-5CG13462PL.amd.com>
Date:   Thu, 24 Aug 2023 16:48:41 +0530
From:   Wyes Karny <wyes.karny@....com>
To:     Meng Li <li.meng@....com>
CC:     Wyes Karny <wyes.karny@....com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Huang Rui <ray.huang@....com>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
        <linux-acpi@...r.kernel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        <linux-kselftest@...r.kernel.org>,
        Nathan Fontenot <nathan.fontenot@....com>,
        Deepak Sharma <deepak.sharma@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Mario Limonciello <mario.limonciello@....com>,
        Shimmer Huang <shimmer.huang@....com>,
        Perry Yuan <Perry.Yuan@....com>,
        Xiaojian Du <Xiaojian.Du@....com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH V3 7/7] Documentation: introduce AMD Pstate Preferrd Core mode kernel command line options

On 24 Aug 10:12, Meng Li wrote:
> AMD Pstate driver support enable/disable Preferred core.
> Default enabled on platforms supporting AMD Preferred Core.
> Disable AMD Pstate Preferred Core with
> "amd_prefcore=disable" added to the kernel command line.
> 
> Signed-off-by: Meng Li <li.meng@....com>
> Reviewed-by: Mario Limonciello <mario.limonciello@....com>
Reviewed-by: Wyes Karny <wyes.karny@....com>

> ---
>  Documentation/admin-guide/kernel-parameters.txt | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 23ebe34ff901..4f78067bb8af 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -363,6 +363,11 @@
>  			  selects a performance level in this range and appropriate
>  			  to the current workload.
>  
> +	amd_prefcore=
> +			[X86]
> +			disable
> +			  Disable AMD Pstate Preferred Core.
> +
>  	amijoy.map=	[HW,JOY] Amiga joystick support
>  			Map of devices attached to JOY0DAT and JOY1DAT
>  			Format: <a>,<b>
> -- 
> 2.34.1
>