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Shenoy" To: Perry Yuan Cc: rafael.j.wysocki@intel.com, ray.huang@amd.com, viresh.kumar@linaro.org, Mario.Limonciello@amd.com, Nathan.Fontenot@amd.com, Alexander.Deucher@amd.com, Deepak.Sharma@amd.com, Shimmer.Huang@amd.com, Li.Meng@amd.com, Xiaojian.Du@amd.com, wyes.karny@amd.com, ananth.narayan@amd.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 5/5] Documentation: add amd-pstate kernel command line options Message-ID: References: <20221117024955.3319484-1-Perry.Yuan@amd.com> <20221117024955.3319484-6-Perry.Yuan@amd.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221117024955.3319484-6-Perry.Yuan@amd.com> X-ClientProxiedBy: PN2PR01CA0108.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c01:27::23) To BYAPR12MB3286.namprd12.prod.outlook.com (2603:10b6:a03:139::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR12MB3286:EE_|PH0PR12MB7078:EE_ X-MS-Office365-Filtering-Correlation-Id: 01eceabb-d3e6-47c6-aa48-08dac85297c8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?hfL/OnwvGadkiFGLkFSMDQyTPlVL/vLspt7T8ASyY7Xsx5e7qMhWQi6QrEWH?= =?us-ascii?Q?bPqFb98rKhFoK3xMC71VRML6i+MyKQPyZbNO7H/1q0kSYvgnV6/mbLcyPhOC?= =?us-ascii?Q?kb5UZrM/nvl19FHJcDwpVvif8MR6LuIiSwZDlNuk9mcArMMZs1cijCS+oHTH?= =?us-ascii?Q?+wFARle4Ren6xM6VDUVMNxykcU/+WmciOKgsVy+fT5sbf/7zk69u+Ck3NBWn?= =?us-ascii?Q?T1Vos3bjkowgN6DZvw6Am79E2YfedvcJj/vh3Ra/pMJzt104wQfoafCsGY9/?= =?us-ascii?Q?W0hjRb0fpQL56gMa2l9m+3eDus4maBo9qcYCMsNqSeo6EaHocogn0MdXsZdV?= =?us-ascii?Q?5VMs4Pr1i7z5fF7q9yrJOP3UVgULqUdM/b2As0LdW/2MBIH0npmIXmMWBpiu?= =?us-ascii?Q?TcWefx07yQDNuqkb3Gzr57ZUkApO4nRLdNdvUI7nxtM6inAXtlpQpwGSr4mp?= =?us-ascii?Q?S4WTOXBJQL+qNHC5MydgUU0m8UnQCg+dL9/zNfbimqTpFcZ8rz7EqUF2eqB2?= =?us-ascii?Q?cIf/CVhJMWTrLk55+Q32ahEaH8NM0fw8/G8kZ7kevqWXl7VjWZClQVRP2R7E?= =?us-ascii?Q?JvXOkcEP3zIHEri8gCZNPoAurYl5BRTO96UUlpB/V1FNlO7Sdr6kfDtphX1Y?= =?us-ascii?Q?fFFYzAlC1gzXVoLuDBDfz1TnI7Ll5K4H1T1Kj+wzQwgDCDWLeRW6PDT7y/nP?= =?us-ascii?Q?vtEStpk+fpKX/IG87oHJbQgLtKi870r50Ixt5/GOjSMi8QYuE4HQxG+pGe26?= =?us-ascii?Q?SCUAYkEbRUmzZWWVl021H2iCsp6tmQBQTjDcY10B+Jj4oIkDecsuEEDQebOg?= =?us-ascii?Q?n3acBwPsFDMnOz/FONRGskHyZAcUmncNmnxT8K3+bN71qH+cnfyTo0UnhMv0?= =?us-ascii?Q?i0js/2fD/9ch7hSz/1H2jKme6PANrBM1F92XyngaCIeE36My0E+ley94O99J?= =?us-ascii?Q?OrewiPBNDV8AobGGJxjIp0lpcNUs9OKskGRfMc+rrit9KoDmHgTAEMkgcUV3?= =?us-ascii?Q?O4pxj1czYIXUIWWv128Hkd5rihu80V8Bks95ozOqK0wASu/ULXwY+bY9RD2b?= =?us-ascii?Q?CSPt+TauX36bb2Vv/de1/yCYsrwo/4/vmg2CZ1HPWJlau8ZYvter4lE9bGoR?= =?us-ascii?Q?0eg+cdCBEvjkoLwtNVQPFlvhaQDPkvGsm4gxjEltKLzfjyVjs1E8wKfdYo3N?= =?us-ascii?Q?lmtFTtBqd5XCK6rPJ+mietvmLgY50ujQR+S4Uml/66xumIGnVqwFgn6f7uaw?= =?us-ascii?Q?Oxbjyi7GLjqyp5qmLnZLJ31HUYwmwgZp1Mys2gB2/WSBx7/HyQioo8I4aQzu?= =?us-ascii?Q?DLLkX0BB9yPJMOx5DkJ0dmkFTHIlPW0rl5LogAOJDf6VkKONqbdKwGHT+KdQ?= =?us-ascii?Q?pxyCoULUpLMKoUztpIdnid/HN6efsbQWOQDQ/r/MfTpiy8Ammko88+r5FeVZ?= =?us-ascii?Q?HGe+gsVrPw3oJ4Ox+8PwRMIPXHmoW1O1U0hdxtNEcFNjuIXck07tj4yy1nIo?= =?us-ascii?Q?XOQZSV2u8GeSMqsS045KMLxGW6vCofLP1mfvnCL/Q4IMm1PHYNP+VfE9MDd6?= =?us-ascii?Q?qT8FvWT1Z0wJEXaZtHkLz6gRVPHdJC/csLaO3rZT?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 01eceabb-d3e6-47c6-aa48-08dac85297c8 X-MS-Exchange-CrossTenant-AuthSource: BYAPR12MB3286.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Nov 2022 04:17:08.6980 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 5m/q6/zsGVmSsaJonksPERb7ioIDSxkTHwy0T95H4rMbJp23dDbx27c/CFLeGJh7wo9BOijnx6h0yegXOMFu/g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB7078 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 17, 2022 at 10:49:55AM +0800, Perry Yuan wrote: > Add a new amd pstate driver command line option to enable driver passive > working mode via MSR and shared memory interface to request desired > performance within abstract scale and the power management firmware > (SMU) convert the perf requests into actual hardware pstates. > > Also the `disable` parameter can disable the pstate driver loading by > adding `amd_pstate=disable` to kernel command line. > > Signed-off-by: Perry Yuan Reviewed-by: Gautham R. Shenoy > --- > Documentation/admin-guide/kernel-parameters.txt | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index a465d5242774..42af9ca0127e 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -6959,3 +6959,14 @@ > memory, and other data can't be written using > xmon commands. > off xmon is disabled. > + > + amd_pstate= [X86] > + disable > + Do not enable amd_pstate as the default > + scaling driver for the supported processors > + passive > + Use amd_pstate as a scaling driver, driver requests a > + desired performance on this abstract scale and the power > + management firmware translates the requests into actual > + hardware states (core frequency, data fabric and memory > + clocks etc.) > -- > 2.25.1 >