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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 v12 09/11] Documentation: introduce amd pstate active mode kernel command line options
Date: Tue, 31 Jan 2023 17:00:14 +0800	[thread overview]
Message-ID: <20230131090016.3970625-10-perry.yuan@amd.com> (raw)
In-Reply-To: <20230131090016.3970625-1-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.

Acked-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Wyes Karny <wyes.karny@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 | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 6cfa6e3996cf..e3618dfdb36a 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -7020,3 +7020,10 @@
 			  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:[~2023-01-31  9:07 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-31  9:00 [PATCH v12 00/11] Implement AMD Pstate EPP Driver Perry Yuan
2023-01-31  9:00 ` [PATCH v12 01/11] ACPI: CPPC: Add AMD pstate energy performance preference cppc control Perry Yuan
2023-01-31  9:00 ` [PATCH v12 02/11] Documentation: amd-pstate: add EPP profiles introduction Perry Yuan
2023-01-31  9:00 ` [PATCH v12 03/11] cpufreq: amd-pstate: optimize driver working mode selection in amd_pstate_param() Perry Yuan
2023-01-31  9:00 ` [PATCH v12 04/11] cpufreq: amd-pstate: implement Pstate EPP support for the AMD processors Perry Yuan
2023-01-31  9:00 ` [PATCH v12 05/11] cpufreq: amd-pstate: implement amd pstate cpu online and offline callback Perry Yuan
2023-01-31  9:00 ` [PATCH v12 06/11] cpufreq: amd-pstate: implement suspend and resume callbacks Perry Yuan
2023-01-31  9:00 ` [PATCH v12 07/11] cpufreq: amd-pstate: add driver working mode switch support Perry Yuan
2023-01-31  9:00 ` [PATCH v12 08/11] Documentation: amd-pstate: add amd pstate driver mode introduction Perry Yuan
2023-01-31  9:00 ` Perry Yuan [this message]
2023-01-31  9:00 ` [PATCH v12 10/11] cpufreq: amd-pstate: convert sprintf with sysfs_emit() Perry Yuan
2023-01-31  9:00 ` [PATCH v12 11/11] Documentation: amd-pstate: introduce new global sysfs attributes Perry Yuan
2023-01-31 12:36 ` [PATCH v12 00/11] Implement AMD Pstate EPP Driver Muhammad Usama Anjum
2023-02-03 21:03 ` Rafael J. Wysocki
2023-02-06  2:57   ` Yuan, Perry

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