From: Wyes Karny <wyes.karny@amd.com>
To: Perry Yuan <Perry.Yuan@amd.com>,
rafael.j.wysocki@intel.com, ray.huang@amd.com,
viresh.kumar@linaro.org, Mario.Limonciello@amd.com
Cc: Nathan.Fontenot@amd.com, Alexander.Deucher@amd.com,
Deepak.Sharma@amd.com, Shimmer.Huang@amd.com, Li.Meng@amd.com,
Xiaojian.Du@amd.com, gautham.shenoy@amd.com,
ananth.narayan@amd.com, linux-pm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/5] Documentation: add amd-pstate kernel command line options
Date: Thu, 17 Nov 2022 10:38:31 +0530 [thread overview]
Message-ID: <2b004975-76d7-0db9-1ded-649c2da5a729@amd.com> (raw)
In-Reply-To: <20221117024955.3319484-6-Perry.Yuan@amd.com>
On 11/17/2022 8:19 AM, Perry Yuan wrote:
> Add a new amd pstate driver command line option to enable driver passive
> working mode via MSR and shared memory interface to request desired
> performance within abstract scale and the power management firmware
> (SMU) convert the perf requests into actual hardware pstates.
>
> Also the `disable` parameter can disable the pstate driver loading by
> adding `amd_pstate=disable` to kernel command line.
>
> Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
Tested-by: Wyes Karny <wyes.karny@amd.com>
> ---
> Documentation/admin-guide/kernel-parameters.txt | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index a465d5242774..42af9ca0127e 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -6959,3 +6959,14 @@
> memory, and other data can't be written using
> xmon commands.
> off xmon is disabled.
> +
> + amd_pstate= [X86]
> + disable
> + Do not enable amd_pstate as the default
> + scaling driver for the supported processors
> + passive
> + Use amd_pstate as a scaling driver, driver requests a
> + desired performance on this abstract scale and the power
> + management firmware translates the requests into actual
> + hardware states (core frequency, data fabric and memory
> + clocks etc.)
--
Thanks & Regards,
Wyes
next prev parent reply other threads:[~2022-11-17 5:08 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-17 2:49 [PATCH 0/5] AMD Pstate driver Urgent Change Perry Yuan
2022-11-17 2:49 ` [PATCH 1/5] cpufreq: amd-pstate: cpufreq: amd-pstate: reset MSR_AMD_PERF_CTL register at init Perry Yuan
2022-11-17 4:08 ` Gautham R. Shenoy
2022-11-17 5:03 ` Wyes Karny
2022-11-17 2:49 ` [PATCH 2/5] cpufreq: amd-pstate: change amd-pstate driver to be built-in type Perry Yuan
2022-11-17 4:09 ` Gautham R. Shenoy
2022-11-17 5:04 ` Wyes Karny
2022-11-17 2:49 ` [PATCH 3/5] cpufreq: amd-pstate: add amd-pstate driver parameter for mode selection Perry Yuan
2022-11-17 4:13 ` Gautham R. Shenoy
2022-11-17 5:06 ` Wyes Karny
2022-11-17 2:49 ` [PATCH 4/5] Documentation: amd-pstate: add driver working mode introduction Perry Yuan
2022-11-17 4:15 ` Gautham R. Shenoy
2022-11-17 4:17 ` Yuan, Perry
2022-11-17 5:06 ` Wyes Karny
2022-11-17 2:49 ` [PATCH 5/5] Documentation: add amd-pstate kernel command line options Perry Yuan
2022-11-17 4:16 ` Gautham R. Shenoy
2022-11-17 5:08 ` Wyes Karny [this message]
2022-11-17 5:35 ` [PATCH 0/5] AMD Pstate driver Urgent Change Huang Rui
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