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Mon, 28 Nov 2022 11:08:10 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , Subject: [PATCH v5 5/9] cpufreq: amd-pstate: implement suspend and resume callbacks Date: Tue, 29 Nov 2022 01:03:10 +0800 Message-ID: <20221128170314.2276636-6-perry.yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221128170314.2276636-1-perry.yuan@amd.com> References: <20221128170314.2276636-1-perry.yuan@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT059:EE_|MW4PR12MB6976:EE_ X-MS-Office365-Filtering-Correlation-Id: f7883baf-c76d-4c48-1374-08dad16322ce 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)(39860400002)(396003)(346002)(376002)(136003)(451199015)(46966006)(40470700004)(36840700001)(86362001)(83380400001)(2906002)(186003)(336012)(426003)(36860700001)(8936002)(4326008)(5660300002)(40460700003)(70586007)(478600001)(82740400003)(70206006)(82310400005)(15650500001)(26005)(7696005)(1076003)(16526019)(2616005)(41300700001)(81166007)(47076005)(8676002)(40480700001)(44832011)(54906003)(110136005)(316002)(356005)(36756003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Nov 2022 17:08:14.1776 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f7883baf-c76d-4c48-1374-08dad16322ce 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: BN8NAM11FT059.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB6976 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?1750761038724056280?= X-GMAIL-MSGID: =?utf-8?q?1750761038724056280?= 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. 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 b77f5b1f3565..3626ae1e8f9a 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -1270,6 +1270,44 @@ static int amd_pstate_epp_cpu_offline(struct cpufreq_policy *policy) return amd_pstate_cpu_offline(policy); } +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_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 void amd_pstate_verify_cpu_policy(struct amd_cpudata *cpudata, struct cpufreq_policy_data *policy) { @@ -1306,6 +1344,8 @@ 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, };