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Wysocki" , Huang Rui CC: , , , , Shuah Khan , , "Nathan Fontenot" , Deepak Sharma , Alex Deucher , Mario Limonciello , Shimmer Huang , "Perry Yuan" , Xiaojian Du , Viresh Kumar , Borislav Petkov , Meng Li Subject: [PATCH V3 6/7] Documentation: amd-pstate: introduce AMD Pstate Preferred Core Date: Thu, 24 Aug 2023 10:12:48 +0800 Message-ID: <20230824021249.271946-7-li.meng@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230824021249.271946-1-li.meng@amd.com> References: <20230824021249.271946-1-li.meng@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: CY4PEPF0000EDD3:EE_|PH8PR12MB7230:EE_ X-MS-Office365-Filtering-Correlation-Id: a53d6250-08b2-4273-3df1-08dba447dcc4 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:(13230031)(4636009)(136003)(346002)(396003)(39860400002)(376002)(186009)(451199024)(1800799009)(82310400011)(36840700001)(46966006)(40470700004)(36756003)(86362001)(478600001)(40460700003)(40480700001)(47076005)(8676002)(8936002)(36860700001)(426003)(16526019)(26005)(2906002)(4326008)(1076003)(336012)(83380400001)(5660300002)(2616005)(110136005)(316002)(70586007)(6666004)(82740400003)(6636002)(356005)(54906003)(70206006)(41300700001)(7696005)(81166007)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Aug 2023 02:14:35.5445 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a53d6250-08b2-4273-3df1-08dba447dcc4 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EDD3.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB7230 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Introduce AMD Pstate Preferred Core. check preferred core state: $ cat /sys/devices/system/cpu/amd-pstate/prefcore Signed-off-by: Meng Li --- Documentation/admin-guide/pm/amd-pstate.rst | 53 +++++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 1cf40f69278c..2369b58a3521 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -353,6 +353,47 @@ 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. +AMD Pstate Preferred Core +================================= + +The core frequency is subjected to the process variation in semiconductors. +Not all cores are able to reach the maximum frequency respecting the +infrastructure limits. Consequently, AMD has redefined the concept of +maximum frequency of a part. This means that a fraction of cores can reach +maximum frequency. To find the best process scheduling policy for a given +scenario, OS needs to know the core ordering informed by the platform through +highest performance capability register of the CPPC interface. + +``AMD Pstate Preferred Core`` enable the scheduler to favor scheduling on cores +can be get a higher frequency with lower voltage under preferred core. +And it has the ability to dynamically change the preferred core based on the +workload and platform conditions and accounting for thermals and aging. + +The priority metric will be initialized by the AMD Pstate driver. The AMD Pstate +driver will also determine whether or not ``AMD Pstate Preferred Core`` is +supported by the platform. + +AMD Pstate driver will provide an initial core ordering when the system boots. +The platform uses the CPPC interfaces to communicate the core ranking to the +operating system and scheduler to make sure that OS is choosing the cores +with highest performance firstly for scheduling the process. When AMD Pstate +driver receives a message with the highest performance change, it will +update the core ranking and set the cpu's priority. + +AMD Preferred Core Switch +================================= +Kernel Parameters +----------------- + +``AMD Pstate Preferred Core`` has two states: enable and disable. +Enable/disable states can be chosen by different kernel parameters. +Default enable ``AMD Pstate Preferred Core``. + +``amd_prefcore=disable`` + +``AMD Pstate Preferred Core`` will be enabled if the underlying platform +supports it. It can be disabled by kernerl parameter: ``amd_prefcore=disable``. + User Space Interface in ``sysfs`` - General =========================================== @@ -385,6 +426,18 @@ control its functionality at the system level. They are located in the to the operation mode represented by that string - or to be unregistered in the "disable" case. +``prefcore`` + Preferred Core state of the driver: "enabled" or "disabled". + + "enabled" + Enable the AMD Preferred Core. + + "disabled" + Disable the AMD Preferred Core + + + This attribute is read-only to check the state of Preferred Core. + ``cpupower`` tool support for ``amd-pstate`` ===============================================