From: Perry Yuan <perry.yuan@amd.com>
To: <rafael.j.wysocki@intel.com>, <Mario.Limonciello@amd.com>,
<ray.huang@amd.com>, <viresh.kumar@linaro.org>
Cc: <Deepak.Sharma@amd.com>, <Nathan.Fontenot@amd.com>,
<Alexander.Deucher@amd.com>, <Shimmer.Huang@amd.com>,
<Xiaojian.Du@amd.com>, <Li.Meng@amd.com>, <wyes.karny@amd.com>,
<linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v6 10/11] Documentation: introduce amd pstate active mode kernel command line options
Date: Fri, 2 Dec 2022 15:47:18 +0800 [thread overview]
Message-ID: <20221202074719.623673-11-perry.yuan@amd.com> (raw)
In-Reply-To: <20221202074719.623673-1-perry.yuan@amd.com>
AMD Pstate driver support another firmware based autonomous mode
with "amd_pstate=active" added to the kernel command line.
In autonomous mode SMU firmware decides frequencies at 1 ms timescale
based on workload utilization, usage in other IPs, infrastructure
limits such as power, thermals and so on.
Signed-off-by: Perry Yuan <perry.yuan@amd.com>
---
Documentation/admin-guide/kernel-parameters.txt | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 42af9ca0127e..73a02816f6f8 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -6970,3 +6970,10 @@
management firmware translates the requests into actual
hardware states (core frequency, data fabric and memory
clocks etc.)
+ active
+ Use amd_pstate_epp driver instance as the scaling driver,
+ driver provides a hint to the hardware if software wants
+ to bias toward performance (0x0) or energy efficiency (0xff)
+ to the CPPC firmware. then CPPC power algorithm will
+ calculate the runtime workload and adjust the realtime cores
+ frequency.
--
2.34.1
next prev parent reply other threads:[~2022-12-02 7:53 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-02 7:47 [PATCH v6 00/11] Implement AMD Pstate EPP Driver Perry Yuan
2022-12-02 7:47 ` [PATCH v6 01/11] ACPI: CPPC: Add AMD pstate energy performance preference cppc control Perry Yuan
2022-12-02 16:58 ` Limonciello, Mario
2022-12-05 15:17 ` Yuan, Perry
2022-12-02 7:47 ` [PATCH v6 02/11] Documentation: amd-pstate: add EPP profiles introduction Perry Yuan
2022-12-02 7:47 ` [PATCH v6 03/11] cpufreq: intel_pstate: use common macro definition for Energy Preference Performance(EPP) Perry Yuan
2022-12-05 11:48 ` Huang Rui
2022-12-05 14:40 ` Yuan, Perry
2022-12-05 16:44 ` Limonciello, Mario
2022-12-08 14:40 ` Yuan, Perry
2022-12-08 16:46 ` Limonciello, Mario
2022-12-02 7:47 ` [PATCH v6 04/11] cpufreq: amd_pstate: implement Pstate EPP support for the AMD processors Perry Yuan
2022-12-02 17:36 ` Limonciello, Mario
2022-12-08 15:51 ` Yuan, Perry
2022-12-03 19:52 ` kernel test robot
2022-12-05 12:22 ` Huang Rui
2022-12-08 15:43 ` Yuan, Perry
2022-12-02 7:47 ` [PATCH v6 05/11] cpufreq: amd_pstate: implement amd pstate cpu online and offline callback Perry Yuan
2022-12-02 7:47 ` [PATCH v6 06/11] cpufreq: amd-pstate: implement suspend and resume callbacks Perry Yuan
2022-12-02 7:47 ` [PATCH v6 07/11] cpufreq: amd-pstate: add frequency dynamic boost sysfs control Perry Yuan
2022-12-02 15:59 ` Limonciello, Mario
2022-12-05 15:19 ` Yuan, Perry
2022-12-02 7:47 ` [PATCH v6 08/11] cpufreq: amd_pstate: add driver working mode status sysfs entry Perry Yuan
2022-12-02 15:57 ` Limonciello, Mario
2022-12-08 15:55 ` Yuan, Perry
2022-12-02 7:47 ` [PATCH v6 09/11] Documentation: amd-pstate: add amd pstate driver mode introduction Perry Yuan
2022-12-02 7:47 ` Perry Yuan [this message]
2022-12-02 7:47 ` [PATCH v6 11/11] cpufreq: amd_pstate: convert sprintf with sysfs_emit() Perry Yuan
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