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Wed, 18 Jan 2023 01:53:09 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , Subject: [PATCH v11 08/11] Documentation: amd-pstate: add amd pstate driver mode introduction Date: Wed, 18 Jan 2023 15:52:07 +0800 Message-ID: <20230118075210.447418-9-perry.yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230118075210.447418-1-perry.yuan@amd.com> References: <20230118075210.447418-1-perry.yuan@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain 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: CO1NAM11FT101:EE_|BN9PR12MB5081:EE_ X-MS-Office365-Filtering-Correlation-Id: a5ecb011-b045-4eed-932c-08daf9290dae 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)(39860400002)(346002)(376002)(396003)(136003)(451199015)(36840700001)(46966006)(40470700004)(8936002)(5660300002)(41300700001)(4326008)(70206006)(8676002)(70586007)(36756003)(2906002)(44832011)(7696005)(1076003)(478600001)(336012)(86362001)(2616005)(82740400003)(356005)(40460700003)(81166007)(16526019)(26005)(186003)(47076005)(54906003)(36860700001)(110136005)(316002)(40480700001)(426003)(83380400001)(82310400005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jan 2023 07:53:14.2366 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a5ecb011-b045-4eed-932c-08daf9290dae 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: CO1NAM11FT101.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN9PR12MB5081 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 From: Perry Yuan The amd-pstate driver has two operation modes supported: * CPPC Autonomous (active) mode * CPPC non-autonomous (passive) mode. active mode and passive mode can be chosen by different kernel parameters. Acked-by: Huang Rui Tested-by: Wyes Karny Reviewed-by: Mario Limonciello Signed-off-by: Perry Yuan --- Documentation/admin-guide/pm/amd-pstate.rst | 26 +++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 98a2bb44f80c..b6aee69f564f 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -299,8 +299,30 @@ module which supports the new AMD P-States mechanism on most of the future AMD platforms. The AMD P-States mechanism is the more performance and energy efficiency frequency management method on AMD processors. -Kernel Module Options for ``amd-pstate`` -========================================= + +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. + +Active Mode +------------ + +``amd_pstate=active`` + +This is the low-level firmware control mode which is implemented by ``amd_pstate_epp`` +driver with ``amd_pstate=active`` passed to the kernel in the command line. +In this mode, ``amd_pstate_epp`` 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 according to the power supply and thermal, core voltage and some other +hardware conditions. Passive Mode ------------ -- 2.34.1