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Thu, 17 Nov 2022 01:36:21 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , , , , Perry Yuan Subject: [PATCH v3 4/5] Documentation: amd-pstate: add driver working mode introduction Date: Thu, 17 Nov 2022 15:35:40 +0800 Message-ID: <20221117073541.3350600-5-Perry.Yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221117073541.3350600-1-Perry.Yuan@amd.com> References: <20221117073541.3350600-1-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: CO1NAM11FT007:EE_|DM6PR12MB4155:EE_ X-MS-Office365-Filtering-Correlation-Id: 545c60a9-9e39-4ff7-ba37-08dac86e6f02 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)(136003)(39860400002)(346002)(396003)(451199015)(40470700004)(36840700001)(46966006)(36756003)(26005)(86362001)(81166007)(82740400003)(82310400005)(36860700001)(356005)(83380400001)(336012)(426003)(47076005)(2906002)(40460700003)(186003)(1076003)(16526019)(2616005)(5660300002)(478600001)(7696005)(110136005)(40480700001)(8936002)(6636002)(70206006)(6666004)(54906003)(70586007)(41300700001)(8676002)(4326008)(316002)(36900700001)(2101003)(473944003);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Nov 2022 07:36:25.9035 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 545c60a9-9e39-4ff7-ba37-08dac86e6f02 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: CO1NAM11FT007.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4155 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?1749728533721597177?= X-GMAIL-MSGID: =?utf-8?q?1749728533721597177?= Introduce the `amd_pstate` driver new working mode with `amd_pstate=passive` added to kernel command line. If there is no passive mode enabled by user, amd_pstate driver will be disabled by default for now. Acked-by: Huang Rui Reviewed-by: Gautham R. Shenoy Tested-by: Wyes Karny Signed-off-by: Perry Yuan --- Documentation/admin-guide/pm/amd-pstate.rst | 30 +++++++++------------ 1 file changed, 13 insertions(+), 17 deletions(-) diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 8f3d30c5a0d8..06e23538f79c 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -283,23 +283,19 @@ efficiency frequency management method on AMD processors. Kernel Module Options for ``amd-pstate`` ========================================= -.. _shared_mem: - -``shared_mem`` -Use a module param (shared_mem) to enable related processors manually with -**amd_pstate.shared_mem=1**. -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. - -To check whether the current processor is using `Full MSR Support `_ -or `Shared Memory Support `_ : :: - - ray@hr-test1:~$ lscpu | grep cppc - Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 erms invpcid cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr rdpru wbnoinvd cppc arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif v_spec_ctrl umip pku ospke vaes vpclmulqdq rdpid overflow_recov succor smca fsrm - -If the CPU flags have ``cppc``, then this processor supports `Full MSR Support -`_. Otherwise, it supports `Shared Memory Support `_. +Passive Mode +------------ + +``amd_pstate=passive`` + +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``