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Wed, 18 Jan 2023 01:53:03 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , Subject: [PATCH v11 06/11] cpufreq: amd-pstate: implement suspend and resume callbacks Date: Wed, 18 Jan 2023 15:52:05 +0800 Message-ID: <20230118075210.447418-7-perry.yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230118075210.447418-1-perry.yuan@amd.com> References: <20230118075210.447418-1-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: CO1NAM11FT033:EE_|IA1PR12MB7518:EE_ X-MS-Office365-Filtering-Correlation-Id: b08e4b69-bd10-4495-2099-08daf9290989 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)(376002)(39860400002)(346002)(396003)(451199015)(40470700004)(36840700001)(46966006)(7696005)(478600001)(8676002)(110136005)(36756003)(54906003)(4326008)(70206006)(1076003)(41300700001)(70586007)(82740400003)(316002)(36860700001)(356005)(40480700001)(81166007)(40460700003)(2616005)(16526019)(82310400005)(26005)(336012)(86362001)(47076005)(426003)(44832011)(186003)(5660300002)(83380400001)(15650500001)(2906002)(8936002)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jan 2023 07:53:07.3897 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b08e4b69-bd10-4495-2099-08daf9290989 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: CO1NAM11FT033.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB7518 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 Tested-by: Wyes Karny 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 1472a6382b29..9e1bee060597 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -1045,6 +1045,44 @@ 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, @@ -1066,6 +1104,8 @@ 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