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 v8 11/13] Documentation: introduce amd pstate active mode kernel command line options
Date: Mon, 19 Dec 2022 14:40:40 +0800 [thread overview]
Message-ID: <20221219064042.661122-12-perry.yuan@amd.com> (raw)
In-Reply-To: <20221219064042.661122-1-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:[~2022-12-19 6:43 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-19 6:40 [PATCH v8 00/13] Implement AMD Pstate EPP Driver Perry Yuan
2022-12-19 6:40 ` [PATCH v8 01/13] ACPI: CPPC: Add AMD pstate energy performance preference cppc control Perry Yuan
2022-12-19 21:09 ` Limonciello, Mario
2022-12-23 2:16 ` Huang Rui
2022-12-23 3:19 ` Yuan, Perry
2022-12-23 9:06 ` Huang Rui
2022-12-25 16:41 ` Yuan, Perry
2022-12-19 6:40 ` [PATCH v8 02/13] Documentation: amd-pstate: add EPP profiles introduction Perry Yuan
2022-12-19 22:37 ` Limonciello, Mario
2022-12-19 6:40 ` [PATCH v8 03/13] cpufreq: intel_pstate: use common macro definition for Energy Preference Performance(EPP) Perry Yuan
2022-12-20 2:53 ` Mario Limonciello
2022-12-23 3:10 ` Huang Rui
2022-12-23 3:12 ` Yuan, Perry
2022-12-19 6:40 ` [PATCH v8 04/13] cpufreq: amd-pstate: fix kernel hang issue while amd-pstate unregistering Perry Yuan
2022-12-19 22:55 ` Limonciello, Mario
2022-12-19 6:40 ` [PATCH v8 05/13] cpufreq: amd-pstate: optimize driver working mode selection in amd_pstate_param() Perry Yuan
2022-12-19 23:01 ` Limonciello, Mario
2022-12-23 4:23 ` Huang Rui
2022-12-23 9:45 ` Wyes Karny
2022-12-25 16:41 ` Yuan, Perry
2022-12-19 6:40 ` [PATCH v8 06/13] cpufreq: amd-pstate: implement Pstate EPP support for the AMD processors Perry Yuan
2022-12-20 3:09 ` Mario Limonciello
2022-12-23 7:43 ` Huang Rui
2022-12-23 7:52 ` Yuan, Perry
2022-12-19 6:40 ` [PATCH v8 07/13] cpufreq: amd-pstate: implement amd pstate cpu online and offline callback Perry Yuan
2022-12-23 8:11 ` Huang Rui
2022-12-19 6:40 ` [PATCH v8 08/13] cpufreq: amd-pstate: implement suspend and resume callbacks Perry Yuan
2022-12-23 8:12 ` Huang Rui
2022-12-19 6:40 ` [PATCH v8 09/13] cpufreq: amd-pstate: add driver working mode switch support Perry Yuan
2022-12-19 23:38 ` Limonciello, Mario
2022-12-23 8:56 ` Huang Rui
2022-12-25 16:41 ` Yuan, Perry
2022-12-19 6:40 ` [PATCH v8 10/13] Documentation: amd-pstate: add amd pstate driver mode introduction Perry Yuan
2022-12-19 23:28 ` Limonciello, Mario
2022-12-19 6:40 ` Perry Yuan [this message]
2022-12-19 23:29 ` [PATCH v8 11/13] Documentation: introduce amd pstate active mode kernel command line options Limonciello, Mario
2022-12-19 6:40 ` [PATCH v8 12/13] cpufreq: amd-pstate: convert sprintf with sysfs_emit() Perry Yuan
2022-12-19 23:31 ` Limonciello, Mario
2022-12-25 16:42 ` Yuan, Perry
2022-12-23 7:45 ` Huang Rui
2022-12-19 6:40 ` [PATCH v8 13/13] Documentation: amd-pstate: introduce new global sysfs attributes Perry Yuan
2022-12-19 22:35 ` Limonciello, Mario
2022-12-20 18:13 ` [PATCH v8 00/13] Implement AMD Pstate EPP Driver Tor Vic
2022-12-20 18:52 ` Tor Vic
2022-12-21 3:08 ` Yuan, Perry
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