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 v3 5/5] Documentation: add amd-pstate kernel command line options
Date: Thu, 17 Nov 2022 15:35:41 +0800 [thread overview]
Message-ID: <20221117073541.3350600-6-Perry.Yuan@amd.com> (raw)
In-Reply-To: <20221117073541.3350600-1-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.
Acked-by: Huang Rui <ray.huang@amd.com>
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.)
--
2.25.1
next prev parent reply other threads:[~2022-11-17 7:37 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-17 7:35 [PATCH v3 0/5] AMD Pstate driver Urgent Change Perry Yuan
2022-11-17 7:35 ` [PATCH v3 1/5] cpufreq: amd-pstate: cpufreq: amd-pstate: reset MSR_AMD_PERF_CTL register at init Perry Yuan
2022-11-17 7:35 ` [PATCH v3 2/5] cpufreq: amd-pstate: change amd-pstate driver to be built-in type Perry Yuan
2022-11-17 7:35 ` [PATCH v3 3/5] cpufreq: amd-pstate: add amd-pstate driver parameter for mode selection Perry Yuan
2022-11-17 7:35 ` [PATCH v3 4/5] Documentation: amd-pstate: add driver working mode introduction Perry Yuan
2022-11-17 8:58 ` Bagas Sanjaya
2022-11-17 9:34 ` Yuan, Perry
2022-11-17 7:35 ` Perry Yuan [this message]
2022-11-21 19:23 ` [PATCH v3 0/5] AMD Pstate driver Urgent Change Rafael J. Wysocki
2022-11-22 2:16 ` Yuan, Perry
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