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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by DM6NAM11FT055.mail.protection.outlook.com (10.13.173.103) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.5880.8 via Frontend Transport; Fri, 2 Dec 2022 07:51:23 +0000 Received: from pyuan-Cloudripper.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.34; Fri, 2 Dec 2022 01:51:19 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , Subject: [PATCH v6 06/11] cpufreq: amd-pstate: implement suspend and resume callbacks Date: Fri, 2 Dec 2022 15:47:14 +0800 Message-ID: <20221202074719.623673-7-perry.yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221202074719.623673-1-perry.yuan@amd.com> References: <20221202074719.623673-1-perry.yuan@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: DM6NAM11FT055:EE_|IA1PR12MB6019:EE_ X-MS-Office365-Filtering-Correlation-Id: 3aaf6891-566b-43e7-ae73-08dad43a0264 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Dec 2022 07:51:23.8909 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3aaf6891-566b-43e7-ae73-08dad43a0264 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: DM6NAM11FT055.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6019 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 7545d83a934b..b3a82cee2e83 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -1284,6 +1284,44 @@ static int amd_pstate_epp_cpu_offline(struct cpufreq= _policy *policy) return amd_pstate_cpu_offline(policy); } =20 +static int amd_pstate_epp_suspend(struct cpufreq_policy *policy) +{ + struct amd_cpudata *cpudata =3D 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 =3D true; + + /* disable CPPC in lowlevel firmware */ + ret =3D 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 =3D 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 =3D false; + } + + return 0; +} + static void amd_pstate_verify_cpu_policy(struct amd_cpudata *cpudata, struct cpufreq_policy_data *policy) { @@ -1320,6 +1358,8 @@ static struct cpufreq_driver amd_pstate_epp_driver = =3D { .update_limits =3D amd_pstate_epp_update_limits, .offline =3D amd_pstate_epp_cpu_offline, .online =3D amd_pstate_epp_cpu_online, + .suspend =3D amd_pstate_epp_suspend, + .resume =3D amd_pstate_epp_resume, .name =3D "amd_pstate_epp", .attr =3D amd_pstate_epp_attr, }; --=20 2.34.1