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Thu, 19 Jan 2023 05:54:10 -0600 From: Wyes Karny To: Rafael J Wysocki , Huang Rui , Jonathan Corbet , Viresh Kumar , , , Ananth Narayan , CC: , , , Bagas Sanjaya , , Len Brown , Robert Moore , Borislav Petkov , Wyes Karny Subject: [PATCH v3 6/6] Documentation: amd_pstate: Update amd_pstate status sysfs for guided Date: Thu, 19 Jan 2023 11:50:17 +0000 Message-ID: <20230119115017.10188-7-wyes.karny@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230119115017.10188-1-wyes.karny@amd.com> References: <20230119115017.10188-1-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: DM6NAM11FT038:EE_|PH8PR12MB7303:EE_ X-MS-Office365-Filtering-Correlation-Id: 7f6677d9-5564-4482-3b7d-08dafa13e375 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:(13230022)(4636009)(376002)(136003)(346002)(396003)(39860400002)(451199015)(36840700001)(46966006)(40470700004)(7696005)(16526019)(2906002)(110136005)(186003)(1076003)(54906003)(2616005)(26005)(6636002)(316002)(41300700001)(426003)(83380400001)(15650500001)(82740400003)(36860700001)(336012)(8936002)(82310400005)(8676002)(36756003)(4326008)(40480700001)(70206006)(5660300002)(478600001)(86362001)(7416002)(47076005)(81166007)(44832011)(70586007)(40460700003)(356005)(36900700001);DIR:OUT;SFP:1101; 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Signed-off-by: Wyes Karny --- Documentation/admin-guide/pm/amd-pstate.rst | 32 ++++++++++++++++----- 1 file changed, 25 insertions(+), 7 deletions(-) diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 5304adf2fc2f..d85a141109e5 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -303,13 +303,19 @@ 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 requested + performance, Maximum requested performance 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 +344,15 @@ 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 +373,9 @@ 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.