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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 v9 11/13] Documentation: introduce amd pstate active mode kernel command line options
Date: Mon, 26 Dec 2022 00:34:40 +0800	[thread overview]
Message-ID: <20221225163442.2205660-12-perry.yuan@amd.com> (raw)
In-Reply-To: <20221225163442.2205660-1-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 runtime
based on workload utilization, usage in other IPs, infrastructure
limits such as power, thermals and so on.

Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
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


  parent reply	other threads:[~2022-12-25 16:36 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-25 16:34 [PATCH v9 00/13] Implement AMD Pstate EPP Driver Perry Yuan
2022-12-25 16:34 ` [PATCH v9 01/13] ACPI: CPPC: Add AMD pstate energy performance preference cppc control Perry Yuan
2023-01-05  5:31   ` Wyes Karny
2023-01-05  6:02     ` Yuan, Perry
2022-12-25 16:34 ` [PATCH v9 02/13] Documentation: amd-pstate: add EPP profiles introduction Perry Yuan
2023-01-04  0:29   ` Limonciello, Mario
2023-01-05  3:18     ` Yuan, Perry
2022-12-25 16:34 ` [PATCH v9 03/13] cpufreq: intel_pstate: use common macro definition for Energy Preference Performance(EPP) Perry Yuan
2023-01-04  0:31   ` Limonciello, Mario
2023-01-05  5:49     ` Yuan, Perry
2023-01-05  5:56       ` Mario Limonciello
2023-01-05  6:14         ` Yuan, Perry
2022-12-25 16:34 ` [PATCH v9 04/13] cpufreq: amd-pstate: fix kernel hang issue while amd-pstate unregistering Perry Yuan
2022-12-27  2:53   ` Viresh Kumar
2022-12-27  6:32     ` Yuan, Perry
2022-12-25 16:34 ` [PATCH v9 05/13] cpufreq: amd-pstate: optimize driver working mode selection in amd_pstate_param() Perry Yuan
2023-01-04  0:32   ` Limonciello, Mario
2022-12-25 16:34 ` [PATCH v9 06/13] cpufreq: amd-pstate: implement Pstate EPP support for the AMD processors Perry Yuan
2023-01-04  1:05   ` Limonciello, Mario
2023-01-05  6:20     ` Yuan, Perry
2023-01-06  5:22   ` Wyes Karny
2023-01-06  5:58     ` Yuan, Perry
2022-12-25 16:34 ` [PATCH v9 07/13] cpufreq: amd-pstate: implement amd pstate cpu online and offline callback Perry Yuan
2022-12-25 16:34 ` [PATCH v9 08/13] cpufreq: amd-pstate: implement suspend and resume callbacks Perry Yuan
2022-12-27  2:52   ` Viresh Kumar
2023-01-05 15:08     ` Yuan, Perry
2022-12-25 16:34 ` [PATCH v9 09/13] cpufreq: amd-pstate: add driver working mode switch support Perry Yuan
2023-01-04  1:06   ` Limonciello, Mario
2023-01-05  6:02   ` Wyes Karny
2023-01-05  6:57     ` Yuan, Perry
2023-01-05  7:29   ` Wyes Karny
2023-01-05 16:03   ` Wyes Karny
2023-01-06  2:52     ` Yuan, Perry
2023-01-06  3:46   ` Wyes Karny
2022-12-25 16:34 ` [PATCH v9 10/13] Documentation: amd-pstate: add amd pstate driver mode introduction Perry Yuan
2022-12-25 16:34 ` Perry Yuan [this message]
2022-12-25 16:34 ` [PATCH v9 12/13] cpufreq: amd-pstate: convert sprintf with sysfs_emit() Perry Yuan
2022-12-25 16:34 ` [PATCH v9 13/13] Documentation: amd-pstate: introduce new global sysfs attributes Perry Yuan
2023-01-04  0:35   ` Limonciello, Mario
2023-01-05  6:21     ` Yuan, Perry

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