linux-kernel - RE: [PATCH V11 7/7] Documentation: introduce amd-pstate preferrd core mode kernel command line options

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Date:   Thu, 30 Nov 2023 05:52:14 +0000
From:   "Yuan, Perry" <Perry.Yuan@....com>
To:     "Meng, Li (Jassmine)" <Li.Meng@....com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        "Huang, Ray" <Ray.Huang@....com>
CC:     "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "Fontenot, Nathan" <Nathan.Fontenot@....com>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Limonciello, Mario" <Mario.Limonciello@....com>,
        "Huang, Shimmer" <Shimmer.Huang@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Borislav Petkov <bp@...en8.de>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        "Karny, Wyes" <Wyes.Karny@....com>
Subject: RE: [PATCH V11 7/7] Documentation: introduce amd-pstate preferrd core
 mode kernel command line options

[AMD Official Use Only - General]

> -----Original Message-----
> From: Meng, Li (Jassmine) <Li.Meng@....com>
> Sent: Wednesday, November 29, 2023 2:55 PM
> To: Rafael J . Wysocki <rafael.j.wysocki@...el.com>; Huang, Ray
> <Ray.Huang@....com>
> Cc: 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; Fontenot, Nathan <Nathan.Fontenot@....com>;
> Sharma, Deepak <Deepak.Sharma@....com>; Deucher, Alexander
> <Alexander.Deucher@....com>; Limonciello, Mario
> <Mario.Limonciello@....com>; Huang, Shimmer
> <Shimmer.Huang@....com>; Yuan, Perry <Perry.Yuan@....com>; Du,
> Xiaojian <Xiaojian.Du@....com>; Viresh Kumar <viresh.kumar@...aro.org>;
> Borislav Petkov <bp@...en8.de>; Oleksandr Natalenko
> <oleksandr@...alenko.name>; Meng, Li (Jassmine) <Li.Meng@....com>;
> Karny, Wyes <Wyes.Karny@....com>
> Subject: [PATCH V11 7/7] Documentation: introduce amd-pstate preferrd core
> mode kernel command line options
>
> amd-pstate driver support enable/disable preferred core.
> Default enabled on platforms supporting amd-pstate 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>
> Reviewed-by: Huang Rui <ray.huang@....com>
> Tested-by: Oleksandr Natalenko <oleksandr@...alenko.name>
> ---
>  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 758bb25ea3e6..008bdfd63c22 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

Reviewed-by: Perry Yuan < perry.yuan@....com>