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Fri, 6 Jan 2023 00:15:33 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , Subject: [PATCH v10 07/12] cpufreq: amd-pstate: implement suspend and resume callbacks Date: Fri, 6 Jan 2023 14:14:15 +0800 Message-ID: <20230106061420.95715-8-perry.yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230106061420.95715-1-perry.yuan@amd.com> References: <20230106061420.95715-1-perry.yuan@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain 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: DS1PEPF0000E631:EE_|DM6PR12MB4330:EE_ X-MS-Office365-Filtering-Correlation-Id: d1b0c2c2-61c1-4187-fb16-08daefad6d44 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)(396003)(346002)(136003)(39860400002)(376002)(451199015)(36840700001)(40470700004)(46966006)(2616005)(83380400001)(1076003)(336012)(47076005)(40460700003)(426003)(36860700001)(86362001)(40480700001)(82310400005)(82740400003)(356005)(36756003)(316002)(81166007)(8936002)(15650500001)(70206006)(6666004)(16526019)(54906003)(4326008)(7696005)(70586007)(5660300002)(110136005)(8676002)(44832011)(2906002)(41300700001)(186003)(26005)(478600001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Jan 2023 06:15:36.7183 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d1b0c2c2-61c1-4187-fb16-08daefad6d44 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: DS1PEPF0000E631.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4330 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 From: Perry Yuan add suspend and resume support for the AMD processors by amd_pstate_epp driver instance. When the CPPC is suspended, EPP driver will set EPP profile to 'power' profile and set max/min perf to lowest perf value. When resume happens, it will restore the MSR registers with previous cached value. Acked-by: Huang Rui Reviewed-by: Mario Limonciello Signed-off-by: Perry Yuan --- drivers/cpufreq/amd-pstate.c | 40 ++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index ae6d2bf18e16..2c8b126cec5a 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -1040,6 +1040,44 @@ static int amd_pstate_epp_verify_policy(struct cpufreq_policy_data *policy) return 0; } +static int amd_pstate_epp_suspend(struct cpufreq_policy *policy) +{ + struct amd_cpudata *cpudata = policy->driver_data; + int ret; + + /* avoid suspending when EPP is not enabled */ + if (cppc_state != AMD_PSTATE_ACTIVE) + return 0; + + /* set this flag to avoid setting core offline*/ + cpudata->suspended = true; + + /* disable CPPC in lowlevel firmware */ + ret = amd_pstate_enable(false); + if (ret) + pr_err("failed to suspend, return %d\n", ret); + + return 0; +} + +static int amd_pstate_epp_resume(struct cpufreq_policy *policy) +{ + struct amd_cpudata *cpudata = policy->driver_data; + + if (cpudata->suspended) { + mutex_lock(&amd_pstate_limits_lock); + + /* enable amd pstate from suspend state*/ + amd_pstate_epp_reenable(cpudata); + + mutex_unlock(&amd_pstate_limits_lock); + + cpudata->suspended = false; + } + + return 0; +} + static struct cpufreq_driver amd_pstate_driver = { .flags = CPUFREQ_CONST_LOOPS | CPUFREQ_NEED_UPDATE_LIMITS, .verify = amd_pstate_verify, @@ -1061,6 +1099,8 @@ static struct cpufreq_driver amd_pstate_epp_driver = { .exit = amd_pstate_epp_cpu_exit, .offline = amd_pstate_epp_cpu_offline, .online = amd_pstate_epp_cpu_online, + .suspend = amd_pstate_epp_suspend, + .resume = amd_pstate_epp_resume, .name = "amd_pstate_epp", .attr = amd_pstate_epp_attr, }; -- 2.34.1