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Thu, 8 Dec 2022 05:20:01 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , Subject: [PATCH v7 11/13] Documentation: introduce amd pstate active mode kernel command line options Date: Thu, 8 Dec 2022 19:18:50 +0800 Message-ID: <20221208111852.386731-12-perry.yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221208111852.386731-1-perry.yuan@amd.com> References: <20221208111852.386731-1-perry.yuan@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: DM6NAM11FT037:EE_|PH7PR12MB5877:EE_ X-MS-Office365-Filtering-Correlation-Id: 5ed8645f-9d4b-418c-e5f9-08dad90e3873 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)(396003)(346002)(39860400002)(136003)(376002)(451199015)(46966006)(36840700001)(40470700004)(36860700001)(86362001)(41300700001)(82310400005)(2906002)(44832011)(83380400001)(5660300002)(8936002)(70586007)(70206006)(8676002)(110136005)(54906003)(316002)(4326008)(16526019)(426003)(40480700001)(356005)(81166007)(336012)(1076003)(47076005)(40460700003)(2616005)(82740400003)(478600001)(26005)(36756003)(7696005)(186003)(6666004)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Dec 2022 11:20:32.5298 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5ed8645f-9d4b-418c-e5f9-08dad90e3873 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: DM6NAM11FT037.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB5877 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1751644693706323223?= X-GMAIL-MSGID: =?utf-8?q?1751644693706323223?= 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 1 ms timescale based on workload utilization, usage in other IPs, infrastructure limits such as power, thermals and so on. Signed-off-by: Perry Yuan --- 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 42af9ca0127e..73a02816f6f8 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -6970,3 +6970,10 @@ 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.