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Mon, 30 Jan 2023 23:24:45 -0600 From: Wyes Karny To: Rafael J Wysocki , Huang Rui , Jonathan Corbet , Viresh Kumar , , CC: , , , Bagas Sanjaya , , Len Brown , Robert Moore , Borislav Petkov , Ananth Narayan , , Tor Vic , Wyes Karny Subject: [PATCH v4 5/6] cpufreq: amd_pstate: Add guided mode control support via sysfs Date: Tue, 31 Jan 2023 05:21:40 +0000 Message-ID: <20230131052141.96475-6-wyes.karny@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230131052141.96475-1-wyes.karny@amd.com> References: <20230131052141.96475-1-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: DM6NAM11FT037:EE_|DS0PR12MB7994:EE_ X-MS-Office365-Filtering-Correlation-Id: b90b7c73-ad0f-43f2-e8c3-08db034b7a48 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:(13230025)(4636009)(376002)(39860400002)(136003)(396003)(346002)(451199018)(40470700004)(46966006)(36840700001)(36756003)(70586007)(70206006)(6636002)(54906003)(110136005)(316002)(82310400005)(8676002)(4326008)(5660300002)(41300700001)(8936002)(7416002)(36860700001)(86362001)(81166007)(356005)(82740400003)(6666004)(16526019)(186003)(26005)(1076003)(83380400001)(336012)(426003)(40460700003)(40480700001)(44832011)(2906002)(7696005)(47076005)(478600001)(2616005)(36900700001);DIR:OUT;SFP:1101; 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After the addition of guided mode the combinations of mode transitions have been increased (16 combinations). Therefore optimise the amd_pstate_update_status function by implementing a state transition table. There are 4 states amd_pstate supports, namely: 'disable', 'passive', 'active', and 'guided'. The transition from any state to any other state is possible after this change. Only if the state requested matches with the current state then -EBUSY value is returned. Sysfs interface: To disable amd_pstate driver: # echo disable > /sys/devices/system/cpu/amd_pstate/status To enable passive mode: # echo passive > /sys/devices/system/cpu/amd_pstate/status To change mode to active: # echo active > /sys/devices/system/cpu/amd_pstate/status To change mode to guided: # echo guided > /sys/devices/system/cpu/amd_pstate/status Signed-off-by: Wyes Karny Reviewed-by: Mario Limonciello --- drivers/cpufreq/amd-pstate.c | 150 +++++++++++++++++++++++++---------- 1 file changed, 108 insertions(+), 42 deletions(-) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 48ab4684c3a5..6c522dec6967 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -65,6 +65,8 @@ static struct cpufreq_driver amd_pstate_epp_driver; static int cppc_state = AMD_PSTATE_DISABLE; struct kobject *amd_pstate_kobj; +typedef int (*cppc_mode_transition_fn)(int); + static inline int get_mode_idx_from_str(const char *str, size_t size) { int i; @@ -797,6 +799,105 @@ static ssize_t show_energy_performance_preference( return sysfs_emit(buf, "%s\n", energy_perf_strings[preference]); } +static void amd_pstate_driver_cleanup(void) +{ + amd_pstate_enable(false); + cppc_state = AMD_PSTATE_DISABLE; + current_pstate_driver = NULL; +} + +static int amd_pstate_register_driver(int mode) +{ + int ret; + + if (mode == AMD_PSTATE_PASSIVE || mode == AMD_PSTATE_GUIDED) + current_pstate_driver = &amd_pstate_driver; + else if (mode == AMD_PSTATE_ACTIVE) + current_pstate_driver = &amd_pstate_epp_driver; + else + return -EINVAL; + + cppc_state = mode; + ret = cpufreq_register_driver(current_pstate_driver); + if (ret) { + amd_pstate_driver_cleanup(); + return ret; + } + return 0; +} + +static int amd_pstate_unregister_driver(int dummy) +{ + int ret; + + ret = cpufreq_unregister_driver(current_pstate_driver); + + if (ret) + return ret; + + amd_pstate_driver_cleanup(); + return 0; +} + +static int amd_pstate_change_mode_without_dvr_change(int mode) +{ + int cpu = 0; + + cppc_state = mode; + + if (boot_cpu_has(X86_FEATURE_CPPC) || cppc_state == AMD_PSTATE_ACTIVE) + return 0; + + for_each_present_cpu(cpu) { + cppc_set_auto_sel(cpu, (cppc_state == AMD_PSTATE_PASSIVE) ? 0 : 1); + } + + return 0; +} + +static int amd_pstate_change_driver_mode(int mode) +{ + int ret; + + ret = amd_pstate_unregister_driver(0); + if (ret) + return ret; + + ret = amd_pstate_register_driver(mode); + if (ret) + return ret; + + return 0; +} + +/* Mode transition table */ +cppc_mode_transition_fn mode_state_machine[AMD_PSTATE_MAX][AMD_PSTATE_MAX] = { + [AMD_PSTATE_DISABLE] = { + [AMD_PSTATE_DISABLE] = NULL, + [AMD_PSTATE_PASSIVE] = amd_pstate_register_driver, + [AMD_PSTATE_ACTIVE] = amd_pstate_register_driver, + [AMD_PSTATE_GUIDED] = amd_pstate_register_driver, + }, + [AMD_PSTATE_PASSIVE] = { + [AMD_PSTATE_DISABLE] = amd_pstate_unregister_driver, + [AMD_PSTATE_PASSIVE] = NULL, + [AMD_PSTATE_ACTIVE] = amd_pstate_change_driver_mode, + [AMD_PSTATE_GUIDED] = amd_pstate_change_mode_without_dvr_change, + }, + [AMD_PSTATE_ACTIVE] = { + [AMD_PSTATE_DISABLE] = amd_pstate_unregister_driver, + [AMD_PSTATE_PASSIVE] = amd_pstate_change_driver_mode, + [AMD_PSTATE_ACTIVE] = NULL, + [AMD_PSTATE_GUIDED] = amd_pstate_change_driver_mode, + }, + [AMD_PSTATE_GUIDED] = { + [AMD_PSTATE_DISABLE] = amd_pstate_unregister_driver, + [AMD_PSTATE_PASSIVE] = amd_pstate_change_mode_without_dvr_change, + [AMD_PSTATE_ACTIVE] = amd_pstate_change_driver_mode, + [AMD_PSTATE_GUIDED] = NULL, + }, +}; + static ssize_t amd_pstate_show_status(char *buf) { if (!current_pstate_driver) @@ -805,57 +906,22 @@ static ssize_t amd_pstate_show_status(char *buf) return sysfs_emit(buf, "%s\n", amd_pstate_mode_string[cppc_state]); } -static void amd_pstate_driver_cleanup(void) -{ - current_pstate_driver = NULL; -} - static int amd_pstate_update_status(const char *buf, size_t size) { - int ret; int mode_idx; - if (size > 7 || size < 6) + if (size > strlen("passive") || size < strlen("active")) return -EINVAL; - mode_idx = get_mode_idx_from_str(buf, size); - switch(mode_idx) { - case AMD_PSTATE_DISABLE: - if (!current_pstate_driver) - return -EINVAL; - if (cppc_state == AMD_PSTATE_ACTIVE) - return -EBUSY; - ret = cpufreq_unregister_driver(current_pstate_driver); - amd_pstate_driver_cleanup(); - break; - case AMD_PSTATE_PASSIVE: - if (current_pstate_driver) { - if (current_pstate_driver == &amd_pstate_driver) - return 0; - cpufreq_unregister_driver(current_pstate_driver); - cppc_state = AMD_PSTATE_PASSIVE; - current_pstate_driver = &amd_pstate_driver; - } + mode_idx = get_mode_idx_from_str(buf, size); - ret = cpufreq_register_driver(current_pstate_driver); - break; - case AMD_PSTATE_ACTIVE: - if (current_pstate_driver) { - if (current_pstate_driver == &amd_pstate_epp_driver) - return 0; - cpufreq_unregister_driver(current_pstate_driver); - current_pstate_driver = &amd_pstate_epp_driver; - cppc_state = AMD_PSTATE_ACTIVE; - } + if (mode_idx < 0 || mode_idx >= AMD_PSTATE_MAX) + return -EINVAL; - ret = cpufreq_register_driver(current_pstate_driver); - break; - default: - ret = -EINVAL; - break; - } + if (mode_state_machine[cppc_state][mode_idx]) + return mode_state_machine[cppc_state][mode_idx](mode_idx); - return ret; + return -EBUSY; } static ssize_t show_status(struct kobject *kobj,