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Sun, 25 Dec 2022 10:35:23 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , Subject: [PATCH v9 08/13] cpufreq: amd-pstate: implement suspend and resume callbacks Date: Mon, 26 Dec 2022 00:34:37 +0800 Message-ID: <20221225163442.2205660-9-perry.yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221225163442.2205660-1-perry.yuan@amd.com> References: <20221225163442.2205660-1-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: CO1NAM11FT024:EE_|BY5PR12MB4885:EE_ X-MS-Office365-Filtering-Correlation-Id: bd86ff92-e60b-4c9f-b2ad-08dae69607b2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: Wazv4fLCvdA3q1ud+SY4z8n2AAw2aqwQ9VCB8J1CesMMhXYJd4tkMwMIrbtptojDtyr7CY5J2k8gFMUcU8qlPMZK4OVP8Ztvjf2vMPSyS7pk7m+F29w2Khiqe+AekYYoLdzk4HJxmlXvfkqGguVJynBr0r8RUOdT+fvLgiS02UsGdB3dcatuUsPGX+qg23hEx4Q93XvTIrUTGJUzzaxJ4D0VZCflVMYou/SJBiEYSLFx7TP44Eh7AC9Us2g5DwzQFdDebMgXj0e2rHvaZau9an393w/YV7W4bemI5ehmZSRByUIXLFLCsPWDpklRgkortxyw+1BJWrWNihUBh673syirDWD/+GLX2e/OFFjrSSELXRxHwglG2lwuK3RL6EPQDiX1EZZGFoQ9LSZtnqFJdm+yEfBDtqLXnR6YFDZwmOn34Ca6874EZDxzK4+Vyi7/wlTddjhXhbGvJJv9QiggYGDaqtO5OchG5jCqAt4Kzpg+jX5q2/7pWiK3cSexfwXvMBB1kmrGoVzRtJ3kx1HtEXClYkx34XnumVj77Goado7dJ7Icfy3ylrwIKvGFOcKND7xwypAmzzBV8IsvtcH2O9a7HXvDVT+8A5Q+xgGQSdwnZNCcMmAXiJ/YZ5BnOo6KMc+tNfmnV7AxM/Io/lls4Z/CSF53mXCF5CpfFz0jtMbtDVMtj3wbi43C799WPiikIYHIoS5bGoz6ZRAwFfKHFD4tq6Jg0dkXobmzr4146oI= 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)(39850400004)(396003)(376002)(451199015)(36840700001)(46966006)(40470700004)(83380400001)(2906002)(54906003)(40460700003)(110136005)(15650500001)(316002)(44832011)(6666004)(36756003)(2616005)(1076003)(26005)(478600001)(186003)(82740400003)(16526019)(356005)(7696005)(81166007)(47076005)(426003)(36860700001)(336012)(82310400005)(86362001)(40480700001)(4326008)(8676002)(8936002)(41300700001)(5660300002)(70586007)(70206006)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Dec 2022 16:35:27.3574 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bd86ff92-e60b-4c9f-b2ad-08dae69607b2 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: CO1NAM11FT024.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4885 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?1753204623864751979?= X-GMAIL-MSGID: =?utf-8?q?1753204623864751979?= 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 c671f4955766..e3676d1a85c7 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -1041,6 +1041,44 @@ 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, @@ -1062,6 +1100,8 @@ 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, };