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Thu, 17 Nov 2022 01:19:32 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , , , , , Perry Yuan Subject: [PATCH v2 1/5] cpufreq: amd-pstate: cpufreq: amd-pstate: reset MSR_AMD_PERF_CTL register at init Date: Thu, 17 Nov 2022 15:19:06 +0800 Message-ID: <20221117071910.3347052-2-Perry.Yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221117071910.3347052-1-Perry.Yuan@amd.com> References: <20221117071910.3347052-1-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_|DS0PR12MB6558:EE_ X-MS-Office365-Filtering-Correlation-Id: 04716dbe-8c12-4ede-f014-08dac86c1604 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)(136003)(346002)(376002)(396003)(39860400002)(451199015)(46966006)(36840700001)(40470700004)(47076005)(8936002)(336012)(82310400005)(426003)(186003)(41300700001)(1076003)(16526019)(2616005)(66899015)(83380400001)(5660300002)(7696005)(70586007)(26005)(4326008)(8676002)(70206006)(36756003)(6666004)(2906002)(478600001)(6636002)(40480700001)(316002)(110136005)(36860700001)(82740400003)(86362001)(81166007)(356005)(54906003)(40460700003)(2101003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Nov 2022 07:19:37.6073 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 04716dbe-8c12-4ede-f014-08dac86c1604 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: DS0PR12MB6558 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?1749727267586143333?= X-GMAIL-MSGID: =?utf-8?q?1749727267586143333?= From: Wyes Karny MSR_AMD_PERF_CTL is guaranteed to be 0 on a cold boot. However, on a kexec boot, for instance, it may have a non-zero value (if the cpu was in a non-P0 Pstate). In such cases, the cores with non-P0 Pstates at boot will never be pushed to P0, let alone boost frequencies. Kexec is a common workflow for reboot on Linux and this creates a regression in performance. Fix it by explicitly setting the MSR_AMD_PERF_CTL to 0 during amd_pstate driver init. Cc: stable@vger.kernel.org Reviewed-by: Gautham R. Shenoy Tested-by: Wyes Karny Signed-off-by: Wyes Karny Signed-off-by: Perry Yuan --- drivers/cpufreq/amd-pstate.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index ace7d50cf2ac..d844c6f97caf 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -424,12 +424,22 @@ static void amd_pstate_boost_init(struct amd_cpudata *cpudata) amd_pstate_driver.boost_enabled = true; } +static void amd_perf_ctl_reset(unsigned int cpu) +{ + wrmsrl_on_cpu(cpu, MSR_AMD_PERF_CTL, 0); +} + static int amd_pstate_cpu_init(struct cpufreq_policy *policy) { int min_freq, max_freq, nominal_freq, lowest_nonlinear_freq, ret; struct device *dev; struct amd_cpudata *cpudata; + /* + * Resetting PERF_CTL_MSR will put the CPU in P0 frequency, + * which is ideal for initialization process. + */ + amd_perf_ctl_reset(policy->cpu); dev = get_cpu_device(policy->cpu); if (!dev) return -ENODEV;