| Message ID | 20221117024955.3319484-6-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 5/5] Documentation: add amd-pstate kernel command line options
Date: Thu, 17 Nov 2022 10:49:55 +0800
Message-ID: <20221117024955.3319484-6-Perry.Yuan@amd.com>
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| Series |
AMD Pstate driver Urgent Change
|
|
Commit Message
Yuan, Perry
Nov. 17, 2022, 2:49 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.
Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
---
Documentation/admin-guide/kernel-parameters.txt | 11 +++++++++++
1 file changed, 11 insertions(+)
Comments
On Thu, Nov 17, 2022 at 10:49:55AM +0800, 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> Reviewed-by: Gautham R. Shenoy <gautham.shenoy@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.) > -- > 2.25.1 >
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.)
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.)