| Message ID | 20221117071910.3347052-6-Perry.Yuan@amd.com |
|---|---|
| State | New |
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From: Perry Yuan <Perry.Yuan@amd.com>
To: <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>, <wyes.karny@amd.com>,
<gautham.shenoy@amd.com>, <ananth.narayan@amd.com>,
<linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
Perry Yuan <Perry.Yuan@amd.com>
Subject: [PATCH v2 5/5] Documentation: add amd-pstate kernel command line
options
Date: Thu, 17 Nov 2022 15:19:10 +0800
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| Series |
AMD Pstate driver Urgent Change
|
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Commit Message
Yuan, Perry
Nov. 17, 2022, 7:19 a.m. UTC
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. Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com> Tested-by: Wyes Karny <wyes.karny@amd.com> Signed-off-by: Perry Yuan <Perry.Yuan@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.)