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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 V2 6/7] Documentation: amd-pstate: introduce AMD Pstate Preferred Core Date: Tue, 15 Aug 2023 14:15:45 +0800 Message-ID: <20230815061546.3556083-7-li.meng@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230815061546.3556083-1-li.meng@amd.com> References: <20230815061546.3556083-1-li.meng@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000044F9:EE_|CH2PR12MB4103:EE_ X-MS-Office365-Filtering-Correlation-Id: a918cc8e-b72e-43a6-d2e9-08db9d574fc2 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:(13230028)(4636009)(39860400002)(136003)(346002)(376002)(396003)(1800799006)(186006)(82310400008)(451199021)(40470700004)(46966006)(36840700001)(40480700001)(40460700003)(356005)(478600001)(81166007)(82740400003)(8676002)(6666004)(8936002)(4326008)(110136005)(70206006)(41300700001)(316002)(6636002)(54906003)(70586007)(36860700001)(83380400001)(47076005)(7696005)(2616005)(1076003)(26005)(426003)(336012)(16526019)(86362001)(2906002)(5660300002)(36756003)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Aug 2023 06:17:32.7378 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a918cc8e-b72e-43a6-d2e9-08db9d574fc2 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: CO1PEPF000044F9.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB4103 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_state Signed-off-by: Meng Li --- Documentation/admin-guide/pm/amd-pstate.rst | 54 +++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 1cf40f69278c..ef2b69935311 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -353,6 +353,48 @@ 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`` + +If ``amd_prefcore=disable`` is passed to kernel command line option +then disable ``AMD Pstate Preferred Core`` if platform can support +the Preferred Core feature. + User Space Interface in ``sysfs`` - General =========================================== @@ -385,6 +427,18 @@ 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`` ===============================================