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Wysocki" , Viresh Kumar , , , Ananth Narayan , , Wyes Karny Subject: [PATCH 3/4] cpufreq: amd_pstate: Expose sysfs interface to control state Date: Wed, 7 Dec 2022 15:46:47 +0000 Message-ID: <20221207154648.233759-4-wyes.karny@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221207154648.233759-1-wyes.karny@amd.com> References: <20221207154648.233759-1-wyes.karny@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: BN8NAM11FT088:EE_|DS7PR12MB8345:EE_ X-MS-Office365-Filtering-Correlation-Id: f64d1e1a-2106-484d-bf9c-08dad86a937b 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)(396003)(346002)(376002)(39860400002)(451199015)(46966006)(36840700001)(40470700004)(82740400003)(54906003)(82310400005)(2906002)(83380400001)(6666004)(16526019)(40480700001)(2616005)(40460700003)(44832011)(316002)(8936002)(1076003)(186003)(41300700001)(478600001)(36756003)(336012)(5660300002)(81166007)(356005)(110136005)(47076005)(7696005)(426003)(70586007)(70206006)(86362001)(4326008)(8676002)(36860700001)(26005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Dec 2022 15:49:07.8371 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f64d1e1a-2106-484d-bf9c-08dad86a937b 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: BN8NAM11FT088.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB8345 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?1751570963681659173?= X-GMAIL-MSGID: =?utf-8?q?1751570963681659173?= As amd_pstate is a built-in driver (commit 456ca88d8a52 ("cpufreq: amd-pstate: change amd-pstate driver to be built-in type")), it can't be unloaded. However, it can be registered/unregistered from the cpufreq-core at runtime. Add a sysfs file to show the current amd_pstate status as well as add register/un-register capability to amd_pstate through this file. This sysfs interface can be used to change the driver mode dynamically. To show current state: #cat /sys/devices/system/cpu/amd_pstate/state # disable [passive] guided "[]" indicates current mode. To disable amd_pstate driver: #echo disable > /sys/devices/system/cpu/amd_pstate/state To enable passive mode: #echo passive > /sys/devices/system/cpu/amd_pstate/state To change mode from passive to guided: #echo guided > /sys/devices/system/cpu/amd_pstate/state Signed-off-by: Wyes Karny --- drivers/cpufreq/amd-pstate.c | 142 +++++++++++++++++++++++++++++++++++ 1 file changed, 142 insertions(+) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 8bffcb9f80cf..023c4384a46a 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -50,6 +50,8 @@ #define AMD_PSTATE_TRANSITION_LATENCY 20000 #define AMD_PSTATE_TRANSITION_DELAY 1000 +typedef int (*cppc_mode_transition_fn)(int); + enum amd_pstate_mode { CPPC_DISABLE = 0, CPPC_PASSIVE, @@ -87,6 +89,8 @@ static inline int get_mode_idx_from_str(const char *str, size_t size) return -EINVAL; } +static DEFINE_MUTEX(amd_pstate_driver_lock); + static inline int pstate_enable(bool enable) { return wrmsrl_safe(MSR_AMD_CPPC_ENABLE, enable); @@ -623,6 +627,124 @@ static ssize_t show_amd_pstate_highest_perf(struct cpufreq_policy *policy, return sprintf(&buf[0], "%u\n", perf); } +static int amd_pstate_driver_cleanup(void) +{ + amd_pstate_enable(false); + cppc_state = CPPC_DISABLE; + return 0; +} + +static int amd_pstate_register_driver(int mode) +{ + int ret; + + ret = cpufreq_register_driver(&amd_pstate_driver); + if (ret) { + amd_pstate_driver_cleanup(); + return ret; + } + + cppc_state = mode; + return 0; +} + +static int amd_pstate_unregister_driver(int dummy) +{ + int ret; + + ret = cpufreq_unregister_driver(&amd_pstate_driver); + + if (ret) + return ret; + + amd_pstate_driver_cleanup(); + return 0; +} + +static int amd_pstate_change_driver_mode(int mode) +{ + cppc_state = mode; + return 0; +} + +/* Mode transition table */ +cppc_mode_transition_fn mode_state_machine[CPPC_MODE_MAX][CPPC_MODE_MAX] = { + [CPPC_DISABLE] = { + [CPPC_DISABLE] = NULL, + [CPPC_PASSIVE] = amd_pstate_register_driver, + [CPPC_GUIDED] = amd_pstate_register_driver, + }, + [CPPC_PASSIVE] = { + [CPPC_DISABLE] = amd_pstate_unregister_driver, + [CPPC_PASSIVE] = NULL, + [CPPC_GUIDED] = amd_pstate_change_driver_mode, + }, + [CPPC_GUIDED] = { + [CPPC_DISABLE] = amd_pstate_unregister_driver, + [CPPC_PASSIVE] = amd_pstate_change_driver_mode, + [CPPC_GUIDED] = NULL, + }, +}; + +static int amd_pstate_update_status(const char *buf, size_t size) +{ + int mode_req = 0; + + mode_req = get_mode_idx_from_str(buf, size); + + if (mode_req < 0 || mode_req >= CPPC_MODE_MAX) + return -EINVAL; + + if (mode_state_machine[cppc_state][mode_req]) + return mode_state_machine[cppc_state][mode_req](mode_req); + return -EBUSY; +} + +static ssize_t amd_pstate_show_status(char *buf) +{ + int i, j = 0; + + for (i = 0; i < CPPC_MODE_MAX; ++i) { + if (i == cppc_state) + j += sprintf(buf + j, "[%s] ", amd_pstate_mode_string[i]); + else + j += sprintf(buf + j, "%s ", amd_pstate_mode_string[i]); + } + j += sprintf(buf + j, "\n"); + return j; +} + +static ssize_t state_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + ssize_t ret = 0; + char *p = memchr(buf, '\n', count); + + 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; +} +static ssize_t state_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + int ret; + + mutex_lock(&amd_pstate_driver_lock); + ret = amd_pstate_show_status(buf); + mutex_unlock(&amd_pstate_driver_lock); + return ret; +} + +static struct kobj_attribute state_attr = __ATTR_RW(state); +static struct attribute *amd_pstate_attrs[] = { + &state_attr.attr, + NULL, +}; + +ATTRIBUTE_GROUPS(amd_pstate); + cpufreq_freq_attr_ro(amd_pstate_max_freq); cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq); @@ -648,6 +770,25 @@ static struct cpufreq_driver amd_pstate_driver = { .attr = amd_pstate_attr, }; +static struct kobject *amd_pstate_kobject; + +static void __init amd_pstate_sysfs_expose_param(void) +{ + int ret = 0; + + amd_pstate_kobject = kobject_create_and_add("amd_pstate", + &cpu_subsys.dev_root->kobj); + + if (WARN_ON(!amd_pstate_kobject)) + return; + + ret = sysfs_create_groups(amd_pstate_kobject, amd_pstate_groups); + if (ret) { + pr_err("sysfs group creation failed (%d)", ret); + return; + } +} + static int __init amd_pstate_init(void) { int ret; @@ -695,6 +836,7 @@ static int __init amd_pstate_init(void) if (ret) pr_err("failed to register amd_pstate_driver with return %d\n", ret); + amd_pstate_sysfs_expose_param(); return ret; }