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Wed, 16 Nov 2022 20:51:04 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , , , , Perry Yuan Subject: [PATCH 0/5] AMD Pstate driver Urgent Change Date: Thu, 17 Nov 2022 10:49:50 +0800 Message-ID: <20221117024955.3319484-1-Perry.Yuan@amd.com> X-Mailer: git-send-email 2.34.1 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: BL02EPF0000EE3C:EE_|IA1PR12MB6409:EE_ X-MS-Office365-Filtering-Correlation-Id: 1a66214c-c6cd-403d-444c-08dac8469459 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)(376002)(346002)(396003)(39860400002)(136003)(451199015)(46966006)(40470700004)(36840700001)(186003)(16526019)(1076003)(5660300002)(336012)(40460700003)(41300700001)(110136005)(6636002)(7696005)(54906003)(316002)(8936002)(36756003)(2616005)(26005)(4326008)(8676002)(70586007)(70206006)(82310400005)(36860700001)(81166007)(356005)(2906002)(82740400003)(40480700001)(83380400001)(47076005)(426003)(86362001)(6666004)(478600001)(36900700001)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Nov 2022 02:51:08.8021 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1a66214c-c6cd-403d-444c-08dac8469459 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: BL02EPF0000EE3C.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6409 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?1749710131361904293?= X-GMAIL-MSGID: =?utf-8?q?1749710131361904293?= The patchset changed amd-pstate driver as built-in type to resolve the driver loading sequence problem, otherwise the acpi-cpufreq driver will be loaded as the default cpufreq scaling driver instead of amd-pstate. Some new kernel parameters are added to allow user to disable pstate driver and load driver with passive mode which use governors to do the frequency scaling control. * `amd_pstate=disabled` or no parameters will not load pstate driver. * `amd_pstate=passive` will load pstate driver with passive mode. Set the `amd_pstate` driver disabled by default because of performance degradation on a number of AMD ASICs in the passive mode driver, especially the shared memory support processors. EPP support for the amd_pstate driver is under review. With EPP support, the said performance issue is resolved. Once that gets upstream, the `active` mode amd_pstate_epp driver may be enabled by default. Perry Yuan (4): cpufreq: amd-pstate: change amd-pstate driver to be built-in type cpufreq: amd-pstate: add amd-pstate driver parameter for mode selection Documentation: amd-pstate: add driver working mode introduction Documentation: add amd-pstate kernel command line options Wyes Karny (1): cpufreq: amd-pstate: cpufreq: amd-pstate: reset MSR_AMD_PERF_CTL register at init .../admin-guide/kernel-parameters.txt | 11 +++++ Documentation/admin-guide/pm/amd-pstate.rst | 30 +++++------- drivers/cpufreq/Kconfig.x86 | 2 +- drivers/cpufreq/amd-pstate.c | 49 +++++++++++++------ 4 files changed, 59 insertions(+), 33 deletions(-)