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 [thread overview]
Message-ID: <20221117024955.3319484-6-Perry.Yuan@amd.com> (raw)
In-Reply-To: <20221117024955.3319484-1-Perry.Yuan@amd.com>
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(+)
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
next prev parent reply other threads:[~2022-11-17 2:52 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 ` Perry Yuan [this message]
2022-11-17 4:16 ` [PATCH 5/5] Documentation: add amd-pstate kernel command line options Gautham R. Shenoy
2022-11-17 5:08 ` Wyes Karny
2022-11-17 5:35 ` [PATCH 0/5] AMD Pstate driver Urgent Change Huang Rui
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20221117024955.3319484-6-Perry.Yuan@amd.com \
--to=perry.yuan@amd.com \
--cc=Alexander.Deucher@amd.com \
--cc=Deepak.Sharma@amd.com \
--cc=Li.Meng@amd.com \
--cc=Mario.Limonciello@amd.com \
--cc=Nathan.Fontenot@amd.com \
--cc=Shimmer.Huang@amd.com \
--cc=Xiaojian.Du@amd.com \
--cc=ananth.narayan@amd.com \
--cc=gautham.shenoy@amd.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=rafael.j.wysocki@intel.com \
--cc=ray.huang@amd.com \
--cc=viresh.kumar@linaro.org \
--cc=wyes.karny@amd.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox