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Thu, 10 Nov 2022 11:59:41 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , , Perry Yuan Subject: [PATCH v4 9/9] Documentation: amd-pstate: add amd pstate driver mode introduction Date: Fri, 11 Nov 2022 01:58:47 +0800 Message-ID: <20221110175847.3098728-10-Perry.Yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221110175847.3098728-1-Perry.Yuan@amd.com> References: <20221110175847.3098728-1-Perry.Yuan@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: BN8NAM11FT003:EE_|DM4PR12MB5103:EE_ X-MS-Office365-Filtering-Correlation-Id: 19ca713c-13fd-4e53-1129-08dac34559e0 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)(346002)(376002)(136003)(39860400002)(396003)(451199015)(36840700001)(46966006)(40470700004)(1076003)(8936002)(47076005)(426003)(16526019)(5660300002)(186003)(478600001)(2906002)(336012)(83380400001)(2616005)(36756003)(7696005)(41300700001)(36860700001)(40480700001)(26005)(82740400003)(81166007)(70206006)(316002)(8676002)(4326008)(356005)(70586007)(82310400005)(54906003)(86362001)(110136005)(40460700003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Nov 2022 17:59:45.3894 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 19ca713c-13fd-4e53-1129-08dac34559e0 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: BN8NAM11FT003.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5103 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?1749133583273082102?= X-GMAIL-MSGID: =?utf-8?q?1749133583273082102?= Introduce ``amd-pstate`` CPPC has two operation modes: * CPPC Autonomous (active) mode * CPPC non-autonomous (passive) mode. active mode and passive mode can be choosed by whith different kernel parameters. Signed-off-by: Perry Yuan --- Documentation/admin-guide/pm/amd-pstate.rst | 47 +++++++++++++++++++-- 1 file changed, 43 insertions(+), 4 deletions(-) diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index e7488891b12f..6ba02a658b31 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -302,11 +302,11 @@ efficiency frequency management method on AMD processors. Kernel Module Options for ``amd-pstate`` ========================================= -.. _shared_mem: +.. legacy_cppc: -``shared_mem`` -Use a module param (shared_mem) to enable related processors manually with -**amd_pstate.shared_mem=1**. +``legacy_cppc`` +Use a module param (legacy_cppc) to enable related processors manually with +**amd_pstate=legacy_cppc**. Due to the performance issue on the processors with `Shared Memory Support `_, we disable it presently and will re-enable this by default once we address performance issue with this solution. @@ -321,6 +321,45 @@ If the CPU flags have ``cppc``, then this processor supports `Full MSR Support `_. Otherwise, it supports `Shared Memory Support `_. +AMD Pstae 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 choosed by whith 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-epp`` + +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 +------------ + +``amd-pstate`` + +It will be enabled if the ``amd_pstate=passive`` is passed to the kernel in the command line. +In this mode, ``amd-pstate``driver software specifies a desired QoS target in the CPPC +performance scale as a relative number. This can be expressed as percentage of nominal +performance (infrastructure max). Below the nominal sustained performance level, +desired performance expresses the average performance level of the processor subject +to the Performance Reduction Tolerance register. Above the nominal performance level, +processor must provide at least nominal performance requested and go higher if current +operating conditions allow. + + ``cpupower`` tool support for ``amd-pstate`` ===============================================