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Mon, 30 Jan 2023 23:25:09 -0600 From: Wyes Karny To: Rafael J Wysocki , Huang Rui , Jonathan Corbet , Viresh Kumar , , CC: , , , Bagas Sanjaya , , Len Brown , Robert Moore , Borislav Petkov , Ananth Narayan , , Tor Vic , Wyes Karny Subject: [PATCH v4 6/6] Documentation: amd_pstate: Update amd_pstate status sysfs for guided Date: Tue, 31 Jan 2023 05:21:41 +0000 Message-ID: <20230131052141.96475-7-wyes.karny@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230131052141.96475-1-wyes.karny@amd.com> References: <20230131052141.96475-1-wyes.karny@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT003:EE_|IA1PR12MB6308:EE_ X-MS-Office365-Filtering-Correlation-Id: 42be5acc-4bb2-4d0e-890a-08db034ba6b3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230025)(4636009)(396003)(376002)(136003)(346002)(39860400002)(451199018)(46966006)(36840700001)(40470700004)(40460700003)(316002)(110136005)(54906003)(83380400001)(70586007)(8936002)(41300700001)(70206006)(4326008)(47076005)(1076003)(6666004)(8676002)(478600001)(186003)(336012)(26005)(16526019)(2616005)(7696005)(356005)(6636002)(426003)(82310400005)(81166007)(40480700001)(36860700001)(5660300002)(7416002)(36756003)(15650500001)(44832011)(2906002)(86362001)(82740400003)(36900700001);DIR:OUT;SFP:1101; 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Signed-off-by: Wyes Karny Reviewed-by: Bagas Sanjaya Reviewed-by: Mario Limonciello --- Documentation/admin-guide/pm/amd-pstate.rst | 31 ++++++++++++++++----- 1 file changed, 24 insertions(+), 7 deletions(-) diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 5304adf2fc2f..56a3d11f51a5 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -303,13 +303,18 @@ efficiency frequency management method on AMD processors. AMD Pstate Driver Operation Modes ================================= -``amd_pstate`` CPPC has two operation modes: CPPC Autonomous(active) mode and -CPPC non-autonomous(passive) mode. -active mode and passive mode can be chosen by different kernel parameters. -When in Autonomous mode, CPPC ignores requests done in the Desired Performance -Target register and takes into account only the values set to the Minimum requested -performance, Maximum requested performance, and Energy Performance Preference -registers. When Autonomous is disabled, it only considers the Desired Performance Target. +``amd_pstate`` CPPC has 3 operation modes: autonomous (active) mode, +non-autonomous (passive) mode and guided autonomous (guided) mode. +Active/passive/guided mode can be chosen by different kernel parameters. + +- In autonomous mode, platform ignores the desired performance level request + and takes into account only the values set to the minimum, maximum and energy + performance preference registers. +- In non-autonomous mode, platform gets desired performance level + from OS directly through Desired Performance Register. +- In guided-autonomous mode, platform sets operating performance level + autonomously according to the current workload and within the limits set by + OS through min and max performance registers. Active Mode ------------ @@ -338,6 +343,15 @@ to the Performance Reduction Tolerance register. Above the nominal performance l processor must provide at least nominal performance requested and go higher if current operating conditions allow. +Guided Mode +----------- + +``amd_pstate=guided`` + +If ``amd_pstate=guided`` is passed to kernel command line option then this mode +is activated. In this mode, driver requests minimum and maximum performance +level and the platform autonomously selects a performance level in this range +and appropriate to the current workload. User Space Interface in ``sysfs`` ================================= @@ -358,6 +372,9 @@ control its functionality at the system level. They are located in the "passive" The driver is functional and in the ``passive mode`` + "guided" + The driver is functional and in the ``guided mode`` + "disable" The driver is unregistered and not functional now.