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Thu, 10 Nov 2022 17:59:41 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; 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 BN8NAM11FT005.mail.protection.outlook.com (10.13.176.69) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.5813.12 via Frontend Transport; Thu, 10 Nov 2022 17:59:41 +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 15.1.2375.31; Thu, 10 Nov 2022 11:59:38 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , , Perry Yuan Subject: [PATCH v4 8/9] cpufreq: amd_pstate: add driver working mode status sysfs entry Date: Fri, 11 Nov 2022 01:58:46 +0800 Message-ID: <20221110175847.3098728-9-Perry.Yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221110175847.3098728-1-Perry.Yuan@amd.com> References: <20221110175847.3098728-1-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: BN8NAM11FT005:EE_|DM4PR12MB7575:EE_ X-MS-Office365-Filtering-Correlation-Id: 7cb6216d-e96f-418a-d98e-08dac34557ae X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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SFS:(13230022)(4636009)(346002)(39860400002)(396003)(376002)(136003)(451199015)(46966006)(36840700001)(40470700004)(40460700003)(356005)(6666004)(86362001)(426003)(82310400005)(2906002)(1076003)(16526019)(47076005)(70586007)(36756003)(82740400003)(4326008)(81166007)(83380400001)(336012)(41300700001)(36860700001)(70206006)(110136005)(26005)(2616005)(7696005)(186003)(8676002)(54906003)(8936002)(5660300002)(316002)(478600001)(40480700001)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Nov 2022 17:59:41.7114 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7cb6216d-e96f-418a-d98e-08dac34557ae 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: BN8NAM11FT005.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB7575 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org While amd-pstate driver was loaded with specific driver mode, it will need to check which mode is enabled for the pstate driver,add this sysfs entry to show the current status $ cat /sys/devices/system/cpu/amd-pstate/status active Signed-off-by: Perry Yuan --- drivers/cpufreq/amd-pstate.c | 44 ++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index b71bfbbb7639..6a3b610cb084 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -65,6 +65,8 @@ static int cppc_load __initdata; static int epp_off __initdata; static struct cpufreq_driver *default_pstate_driver; +static struct cpufreq_driver amd_pstate_epp_driver; +static struct cpufreq_driver amd_pstate_driver; static struct amd_cpudata **all_cpu_data; static struct amd_pstate_params global_params; @@ -798,6 +800,46 @@ static ssize_t store_boost(struct kobject *a, return count; } +static ssize_t amd_pstate_show_status(char *buf) +{ + if (!default_pstate_driver) + return sprintf(buf, "off\n"); + + return sprintf(buf, "%s\n", default_pstate_driver == &amd_pstate_epp_driver ? + "active" : "passive"); +} + +static int amd_pstate_update_status(const char *buf, size_t size) +{ + /* FIXME! */ + return -EOPNOTSUPP; +} + +static ssize_t show_status(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + ssize_t ret; + + mutex_lock(&amd_pstate_driver_lock); + ret = amd_pstate_show_status(buf); + mutex_unlock(&amd_pstate_driver_lock); + + return ret; +} + +static ssize_t store_status(struct kobject *a, struct kobj_attribute *b, + const char *buf, size_t count) +{ + char *p = memchr(buf, '\n', count); + int ret; + + mutex_lock(&amd_pstate_driver_lock); + ret = amd_pstate_update_status(buf, p ? p - buf : count); + mutex_unlock(&amd_pstate_driver_lock); + + return ret < 0 ? ret : count; +} + cpufreq_freq_attr_ro(amd_pstate_max_freq); cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq); @@ -805,6 +847,7 @@ cpufreq_freq_attr_ro(amd_pstate_highest_perf); cpufreq_freq_attr_rw(energy_performance_preference); cpufreq_freq_attr_ro(energy_performance_available_preferences); define_one_global_rw(boost); +define_one_global_rw(status); static struct freq_attr *amd_pstate_attr[] = { &amd_pstate_max_freq, @@ -824,6 +867,7 @@ static struct freq_attr *amd_pstate_epp_attr[] = { static struct attribute *pstate_global_attributes[] = { &boost.attr, + &status.attr, NULL };