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Thu, 17 Nov 2022 01:19:28 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , , , , Perry Yuan Subject: [PATCH v2 0/5] AMD Pstate driver Urgent Change Date: Thu, 17 Nov 2022 15:19:05 +0800 Message-ID: <20221117071910.3347052-1-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: CO1NAM11FT027:EE_|LV2PR12MB5919:EE_ X-MS-Office365-Filtering-Correlation-Id: 0e5d4603-a312-4042-b066-08dac86c1393 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 3K6pVMfXdsAmRnkoJKQAAWlqymrHoHY1Z7uxgiDZ1nIBcv0GXcduGwvDvdogsLlz7iFSl2awN8Z3GKUXpNk4aPitHXOX9UACOOpJ2y1UuKvrtdqmYjJimSwF92BUItIUXwSJUlWQD6OMp0oAYMj2RPH0y0riaanMc8LoUU/XB6AlNf7FzcPk/wL9JHQMVmnOuObGfJuX6h55Wf9bRklFK5qVc86cfL0Y2cXafpu0LWuDs1x2eVikDm9oIAzOX/x28mslW/2eUzVuy92gtOtImH0xxQXBChz4w7vYbw6RmYoYapVPB7RcgG65ZZ/B2hZp2+mTpXm8ynnT80S7IyvLAIls0bqZp8Kmzo7//4HfkwecIUBPyistSBvGV2HVnNz7jyJkKsPJCniA5nHsC/V9IcQABRSjp0DAN4Gx1w3TVSXqTBOco4522UXetbHzTc08AByOIIQ3XsRrJfy438I0aySvUAPZyn7byrUB3dhNLDWJYKzZ2CnrdambUHXvXtXlDCqYhMc2cuXzE53PQX6GfhBdvK6B4ncbnTbgPJrYKrSUc0B9uOeDA+939zBWzPxThOLRn16/EvQGRFtp+Hm5ULNejFcj4gZTZNRnfb911BTo7zruwB9griwzL4nZYIr+WbK+eDWZH0EAoetnq5nP/2jFaJZ0U+UKTM1P7RuLz5SD7ERgqSDaPzQHuQl81fhrBHvZ01Z5eLBDYTZXTOWY4y1nnYli2Hz4MCqNrzpl4xTYUn2nf7H9Q/I/8z+XRyor 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)(136003)(396003)(346002)(39860400002)(376002)(451199015)(46966006)(40470700004)(36840700001)(82310400005)(26005)(36756003)(316002)(110136005)(54906003)(6636002)(86362001)(478600001)(6666004)(81166007)(36860700001)(82740400003)(40480700001)(356005)(426003)(1076003)(2616005)(336012)(16526019)(47076005)(186003)(7696005)(83380400001)(8936002)(40460700003)(2906002)(4326008)(8676002)(41300700001)(70206006)(70586007)(5660300002)(2101003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Nov 2022 07:19:33.5097 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0e5d4603-a312-4042-b066-08dac86c1393 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: CO1NAM11FT027.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV2PR12MB5919 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?1749727234028077019?= X-GMAIL-MSGID: =?utf-8?q?1749727234028077019?= 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. Changes from v1: * fix commit info in v1 patch PATCH 4/5 * pick up Reviewed-by flag of Gautham R. Shenoy * pick up Tested-by flag of Wyes Karny 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(-)