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Mon, 19 Dec 2022 00:41:44 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , Subject: [PATCH v8 08/13] cpufreq: amd-pstate: implement suspend and resume callbacks Date: Mon, 19 Dec 2022 14:40:37 +0800 Message-ID: <20221219064042.661122-9-perry.yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221219064042.661122-1-perry.yuan@amd.com> References: <20221219064042.661122-1-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: DM6NAM11FT056:EE_|BL1PR12MB5923:EE_ X-MS-Office365-Filtering-Correlation-Id: 831b0681-0571-4787-c7a6-08dae18c1a62 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)(376002)(39860400002)(136003)(346002)(451199015)(46966006)(36840700001)(40470700004)(54906003)(36860700001)(110136005)(336012)(44832011)(15650500001)(41300700001)(4326008)(47076005)(40460700003)(86362001)(426003)(36756003)(8936002)(5660300002)(83380400001)(2906002)(316002)(8676002)(40480700001)(2616005)(16526019)(70586007)(70206006)(1076003)(82310400005)(6666004)(26005)(186003)(82740400003)(81166007)(478600001)(356005)(7696005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Dec 2022 06:41:47.9917 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 831b0681-0571-4787-c7a6-08dae18c1a62 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: DM6NAM11FT056.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5923 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?1752623739025387910?= X-GMAIL-MSGID: =?utf-8?q?1752623739025387910?= 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. Reviewed-by: Mario Limonciello Signed-off-by: Perry Yuan Acked-by: Huang Rui --- drivers/cpufreq/amd-pstate.c | 41 ++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index cb647f55a169..fc12d35bc7bd 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -1107,6 +1107,45 @@ 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 = all_cpu_data[policy->cpu]; + 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 = all_cpu_data[policy->cpu]; + + 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, @@ -1129,6 +1168,8 @@ static struct cpufreq_driver amd_pstate_epp_driver = { .update_limits = amd_pstate_epp_update_limits, .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, };