diff options
Diffstat (limited to 'drivers/base/power/main.c')
| -rw-r--r-- | drivers/base/power/main.c | 1231 |
1 files changed, 929 insertions, 302 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 83404973f97..bf412961a93 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -19,6 +19,7 @@ #include <linux/device.h> #include <linux/kallsyms.h> +#include <linux/export.h> #include <linux/mutex.h> #include <linux/pm.h> #include <linux/pm_runtime.h> @@ -27,10 +28,16 @@ #include <linux/sched.h> #include <linux/async.h> #include <linux/suspend.h> +#include <trace/events/power.h> +#include <linux/cpufreq.h> +#include <linux/cpuidle.h> +#include <linux/timer.h> #include "../base.h" #include "power.h" +typedef int (*pm_callback_t)(struct device *); + /* * The entries in the dpm_list list are in a depth first order, simply * because children are guaranteed to be discovered after parents, and @@ -42,27 +49,55 @@ */ LIST_HEAD(dpm_list); -LIST_HEAD(dpm_prepared_list); -LIST_HEAD(dpm_suspended_list); -LIST_HEAD(dpm_noirq_list); +static LIST_HEAD(dpm_prepared_list); +static LIST_HEAD(dpm_suspended_list); +static LIST_HEAD(dpm_late_early_list); +static LIST_HEAD(dpm_noirq_list); +struct suspend_stats suspend_stats; static DEFINE_MUTEX(dpm_list_mtx); static pm_message_t pm_transition; static int async_error; +static char *pm_verb(int event) +{ + switch (event) { + case PM_EVENT_SUSPEND: + return "suspend"; + case PM_EVENT_RESUME: + return "resume"; + case PM_EVENT_FREEZE: + return "freeze"; + case PM_EVENT_QUIESCE: + return "quiesce"; + case PM_EVENT_HIBERNATE: + return "hibernate"; + case PM_EVENT_THAW: + return "thaw"; + case PM_EVENT_RESTORE: + return "restore"; + case PM_EVENT_RECOVER: + return "recover"; + default: + return "(unknown PM event)"; + } +} + /** - * device_pm_init - Initialize the PM-related part of a device object. + * device_pm_sleep_init - Initialize system suspend-related device fields. * @dev: Device object being initialized. */ -void device_pm_init(struct device *dev) +void device_pm_sleep_init(struct device *dev) { - dev->power.in_suspend = false; + dev->power.is_prepared = false; + dev->power.is_suspended = false; + dev->power.is_noirq_suspended = false; + dev->power.is_late_suspended = false; init_completion(&dev->power.completion); complete_all(&dev->power.completion); dev->power.wakeup = NULL; - spin_lock_init(&dev->power.lock); - pm_runtime_init(dev); + INIT_LIST_HEAD(&dev->power.entry); } /** @@ -90,7 +125,7 @@ void device_pm_add(struct device *dev) pr_debug("PM: Adding info for %s:%s\n", dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); mutex_lock(&dpm_list_mtx); - if (dev->parent && dev->parent->power.in_suspend) + if (dev->parent && dev->parent->power.is_prepared) dev_warn(dev, "parent %s should not be sleeping\n", dev_name(dev->parent)); list_add_tail(&dev->power.entry, &dpm_list); @@ -156,9 +191,10 @@ static ktime_t initcall_debug_start(struct device *dev) { ktime_t calltime = ktime_set(0, 0); - if (initcall_debug) { - pr_info("calling %s+ @ %i\n", - dev_name(dev), task_pid_nr(current)); + if (pm_print_times_enabled) { + pr_info("calling %s+ @ %i, parent: %s\n", + dev_name(dev), task_pid_nr(current), + dev->parent ? dev_name(dev->parent) : "none"); calltime = ktime_get(); } @@ -166,15 +202,17 @@ static ktime_t initcall_debug_start(struct device *dev) } static void initcall_debug_report(struct device *dev, ktime_t calltime, - int error) + int error, pm_message_t state, char *info) { - ktime_t delta, rettime; + ktime_t rettime; + s64 nsecs; - if (initcall_debug) { - rettime = ktime_get(); - delta = ktime_sub(rettime, calltime); + rettime = ktime_get(); + nsecs = (s64) ktime_to_ns(ktime_sub(rettime, calltime)); + + if (pm_print_times_enabled) { pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), - error, (unsigned long long)ktime_to_ns(delta) >> 10); + error, (unsigned long long)nsecs >> 10); } } @@ -204,175 +242,103 @@ static void dpm_wait_for_children(struct device *dev, bool async) } /** - * pm_op - Execute the PM operation appropriate for given PM event. - * @dev: Device to handle. + * pm_op - Return the PM operation appropriate for given PM event. * @ops: PM operations to choose from. * @state: PM transition of the system being carried out. */ -static int pm_op(struct device *dev, - const struct dev_pm_ops *ops, - pm_message_t state) +static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state) { - int error = 0; - ktime_t calltime; - - calltime = initcall_debug_start(dev); - switch (state.event) { #ifdef CONFIG_SUSPEND case PM_EVENT_SUSPEND: - if (ops->suspend) { - error = ops->suspend(dev); - suspend_report_result(ops->suspend, error); - } - break; + return ops->suspend; case PM_EVENT_RESUME: - if (ops->resume) { - error = ops->resume(dev); - suspend_report_result(ops->resume, error); - } - break; + return ops->resume; #endif /* CONFIG_SUSPEND */ -#ifdef CONFIG_HIBERNATION +#ifdef CONFIG_HIBERNATE_CALLBACKS case PM_EVENT_FREEZE: case PM_EVENT_QUIESCE: - if (ops->freeze) { - error = ops->freeze(dev); - suspend_report_result(ops->freeze, error); - } - break; + return ops->freeze; case PM_EVENT_HIBERNATE: - if (ops->poweroff) { - error = ops->poweroff(dev); - suspend_report_result(ops->poweroff, error); - } - break; + return ops->poweroff; case PM_EVENT_THAW: case PM_EVENT_RECOVER: - if (ops->thaw) { - error = ops->thaw(dev); - suspend_report_result(ops->thaw, error); - } + return ops->thaw; break; case PM_EVENT_RESTORE: - if (ops->restore) { - error = ops->restore(dev); - suspend_report_result(ops->restore, error); - } - break; -#endif /* CONFIG_HIBERNATION */ - default: - error = -EINVAL; + return ops->restore; +#endif /* CONFIG_HIBERNATE_CALLBACKS */ } - initcall_debug_report(dev, calltime, error); - - return error; + return NULL; } /** - * pm_noirq_op - Execute the PM operation appropriate for given PM event. - * @dev: Device to handle. + * pm_late_early_op - Return the PM operation appropriate for given PM event. * @ops: PM operations to choose from. * @state: PM transition of the system being carried out. * - * The driver of @dev will not receive interrupts while this function is being - * executed. + * Runtime PM is disabled for @dev while this function is being executed. */ -static int pm_noirq_op(struct device *dev, - const struct dev_pm_ops *ops, - pm_message_t state) +static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops, + pm_message_t state) { - int error = 0; - ktime_t calltime = ktime_set(0, 0), delta, rettime; - - if (initcall_debug) { - pr_info("calling %s+ @ %i, parent: %s\n", - dev_name(dev), task_pid_nr(current), - dev->parent ? dev_name(dev->parent) : "none"); - calltime = ktime_get(); - } - switch (state.event) { #ifdef CONFIG_SUSPEND case PM_EVENT_SUSPEND: - if (ops->suspend_noirq) { - error = ops->suspend_noirq(dev); - suspend_report_result(ops->suspend_noirq, error); - } - break; + return ops->suspend_late; case PM_EVENT_RESUME: - if (ops->resume_noirq) { - error = ops->resume_noirq(dev); - suspend_report_result(ops->resume_noirq, error); - } - break; + return ops->resume_early; #endif /* CONFIG_SUSPEND */ -#ifdef CONFIG_HIBERNATION +#ifdef CONFIG_HIBERNATE_CALLBACKS case PM_EVENT_FREEZE: case PM_EVENT_QUIESCE: - if (ops->freeze_noirq) { - error = ops->freeze_noirq(dev); - suspend_report_result(ops->freeze_noirq, error); - } - break; + return ops->freeze_late; case PM_EVENT_HIBERNATE: - if (ops->poweroff_noirq) { - error = ops->poweroff_noirq(dev); - suspend_report_result(ops->poweroff_noirq, error); - } - break; + return ops->poweroff_late; case PM_EVENT_THAW: case PM_EVENT_RECOVER: - if (ops->thaw_noirq) { - error = ops->thaw_noirq(dev); - suspend_report_result(ops->thaw_noirq, error); - } - break; + return ops->thaw_early; case PM_EVENT_RESTORE: - if (ops->restore_noirq) { - error = ops->restore_noirq(dev); - suspend_report_result(ops->restore_noirq, error); - } - break; -#endif /* CONFIG_HIBERNATION */ - default: - error = -EINVAL; - } - - if (initcall_debug) { - rettime = ktime_get(); - delta = ktime_sub(rettime, calltime); - printk("initcall %s_i+ returned %d after %Ld usecs\n", - dev_name(dev), error, - (unsigned long long)ktime_to_ns(delta) >> 10); + return ops->restore_early; +#endif /* CONFIG_HIBERNATE_CALLBACKS */ } - return error; + return NULL; } -static char *pm_verb(int event) +/** + * pm_noirq_op - Return the PM operation appropriate for given PM event. + * @ops: PM operations to choose from. + * @state: PM transition of the system being carried out. + * + * The driver of @dev will not receive interrupts while this function is being + * executed. + */ +static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state) { - switch (event) { + switch (state.event) { +#ifdef CONFIG_SUSPEND case PM_EVENT_SUSPEND: - return "suspend"; + return ops->suspend_noirq; case PM_EVENT_RESUME: - return "resume"; + return ops->resume_noirq; +#endif /* CONFIG_SUSPEND */ +#ifdef CONFIG_HIBERNATE_CALLBACKS case PM_EVENT_FREEZE: - return "freeze"; case PM_EVENT_QUIESCE: - return "quiesce"; + return ops->freeze_noirq; case PM_EVENT_HIBERNATE: - return "hibernate"; + return ops->poweroff_noirq; case PM_EVENT_THAW: - return "thaw"; - case PM_EVENT_RESTORE: - return "restore"; case PM_EVENT_RECOVER: - return "recover"; - default: - return "(unknown PM event)"; + return ops->thaw_noirq; + case PM_EVENT_RESTORE: + return ops->restore_noirq; +#endif /* CONFIG_HIBERNATE_CALLBACKS */ } + + return NULL; } static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) @@ -406,6 +372,93 @@ static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); } +static int dpm_run_callback(pm_callback_t cb, struct device *dev, + pm_message_t state, char *info) +{ + ktime_t calltime; + int error; + + if (!cb) + return 0; + + calltime = initcall_debug_start(dev); + + pm_dev_dbg(dev, state, info); + trace_device_pm_callback_start(dev, info, state.event); + error = cb(dev); + trace_device_pm_callback_end(dev, error); + suspend_report_result(cb, error); + + initcall_debug_report(dev, calltime, error, state, info); + + return error; +} + +#ifdef CONFIG_DPM_WATCHDOG +struct dpm_watchdog { + struct device *dev; + struct task_struct *tsk; + struct timer_list timer; +}; + +#define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \ + struct dpm_watchdog wd + +/** + * dpm_watchdog_handler - Driver suspend / resume watchdog handler. + * @data: Watchdog object address. + * + * Called when a driver has timed out suspending or resuming. + * There's not much we can do here to recover so panic() to + * capture a crash-dump in pstore. + */ +static void dpm_watchdog_handler(unsigned long data) +{ + struct dpm_watchdog *wd = (void *)data; + + dev_emerg(wd->dev, "**** DPM device timeout ****\n"); + show_stack(wd->tsk, NULL); + panic("%s %s: unrecoverable failure\n", + dev_driver_string(wd->dev), dev_name(wd->dev)); +} + +/** + * dpm_watchdog_set - Enable pm watchdog for given device. + * @wd: Watchdog. Must be allocated on the stack. + * @dev: Device to handle. + */ +static void dpm_watchdog_set(struct dpm_watchdog *wd, struct device *dev) +{ + struct timer_list *timer = &wd->timer; + + wd->dev = dev; + wd->tsk = current; + + init_timer_on_stack(timer); + /* use same timeout value for both suspend and resume */ + timer->expires = jiffies + HZ * CONFIG_DPM_WATCHDOG_TIMEOUT; + timer->function = dpm_watchdog_handler; + timer->data = (unsigned long)wd; + add_timer(timer); +} + +/** + * dpm_watchdog_clear - Disable suspend/resume watchdog. + * @wd: Watchdog to disable. + */ +static void dpm_watchdog_clear(struct dpm_watchdog *wd) +{ + struct timer_list *timer = &wd->timer; + + del_timer_sync(timer); + destroy_timer_on_stack(timer); +} +#else +#define DECLARE_DPM_WATCHDOG_ON_STACK(wd) +#define dpm_watchdog_set(x, y) +#define dpm_watchdog_clear(x) +#endif + /*------------------------- Resume routines -------------------------*/ /** @@ -416,90 +469,256 @@ static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) * The driver of @dev will not receive interrupts while this function is being * executed. */ -static int device_resume_noirq(struct device *dev, pm_message_t state) +static int device_resume_noirq(struct device *dev, pm_message_t state, bool async) { + pm_callback_t callback = NULL; + char *info = NULL; int error = 0; TRACE_DEVICE(dev); TRACE_RESUME(0); - if (dev->bus && dev->bus->pm) { - pm_dev_dbg(dev, state, "EARLY "); - error = pm_noirq_op(dev, dev->bus->pm, state); - if (error) - goto End; - } + if (dev->power.syscore || dev->power.direct_complete) + goto Out; - if (dev->type && dev->type->pm) { - pm_dev_dbg(dev, state, "EARLY type "); - error = pm_noirq_op(dev, dev->type->pm, state); - if (error) - goto End; + if (!dev->power.is_noirq_suspended) + goto Out; + + dpm_wait(dev->parent, async); + + if (dev->pm_domain) { + info = "noirq power domain "; + callback = pm_noirq_op(&dev->pm_domain->ops, state); + } else if (dev->type && dev->type->pm) { + info = "noirq type "; + callback = pm_noirq_op(dev->type->pm, state); + } else if (dev->class && dev->class->pm) { + info = "noirq class "; + callback = pm_noirq_op(dev->class->pm, state); + } else if (dev->bus && dev->bus->pm) { + info = "noirq bus "; + callback = pm_noirq_op(dev->bus->pm, state); } - if (dev->class && dev->class->pm) { - pm_dev_dbg(dev, state, "EARLY class "); - error = pm_noirq_op(dev, dev->class->pm, state); + if (!callback && dev->driver && dev->driver->pm) { + info = "noirq driver "; + callback = pm_noirq_op(dev->driver->pm, state); } -End: + error = dpm_run_callback(callback, dev, state, info); + dev->power.is_noirq_suspended = false; + + Out: + complete_all(&dev->power.completion); TRACE_RESUME(error); return error; } +static bool is_async(struct device *dev) +{ + return dev->power.async_suspend && pm_async_enabled + && !pm_trace_is_enabled(); +} + +static void async_resume_noirq(void *data, async_cookie_t cookie) +{ + struct device *dev = (struct device *)data; + int error; + + error = device_resume_noirq(dev, pm_transition, true); + if (error) + pm_dev_err(dev, pm_transition, " async", error); + + put_device(dev); +} + /** - * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. + * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices. * @state: PM transition of the system being carried out. * - * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and + * Call the "noirq" resume handlers for all devices in dpm_noirq_list and * enable device drivers to receive interrupts. */ -void dpm_resume_noirq(pm_message_t state) +static void dpm_resume_noirq(pm_message_t state) { + struct device *dev; ktime_t starttime = ktime_get(); + trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, true); mutex_lock(&dpm_list_mtx); - while (!list_empty(&dpm_noirq_list)) { - struct device *dev = to_device(dpm_noirq_list.next); - int error; + pm_transition = state; + /* + * Advanced the async threads upfront, + * in case the starting of async threads is + * delayed by non-async resuming devices. + */ + list_for_each_entry(dev, &dpm_noirq_list, power.entry) { + reinit_completion(&dev->power.completion); + if (is_async(dev)) { + get_device(dev); + async_schedule(async_resume_noirq, dev); + } + } + + while (!list_empty(&dpm_noirq_list)) { + dev = to_device(dpm_noirq_list.next); get_device(dev); - list_move_tail(&dev->power.entry, &dpm_suspended_list); + list_move_tail(&dev->power.entry, &dpm_late_early_list); mutex_unlock(&dpm_list_mtx); - error = device_resume_noirq(dev, state); - if (error) - pm_dev_err(dev, state, " early", error); + if (!is_async(dev)) { + int error; + + error = device_resume_noirq(dev, state, false); + if (error) { + suspend_stats.failed_resume_noirq++; + dpm_save_failed_step(SUSPEND_RESUME_NOIRQ); + dpm_save_failed_dev(dev_name(dev)); + pm_dev_err(dev, state, " noirq", error); + } + } mutex_lock(&dpm_list_mtx); put_device(dev); } mutex_unlock(&dpm_list_mtx); - dpm_show_time(starttime, state, "early"); + async_synchronize_full(); + dpm_show_time(starttime, state, "noirq"); resume_device_irqs(); + cpuidle_resume(); + trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false); } -EXPORT_SYMBOL_GPL(dpm_resume_noirq); /** - * legacy_resume - Execute a legacy (bus or class) resume callback for device. - * @dev: Device to resume. - * @cb: Resume callback to execute. + * device_resume_early - Execute an "early resume" callback for given device. + * @dev: Device to handle. + * @state: PM transition of the system being carried out. + * + * Runtime PM is disabled for @dev while this function is being executed. */ -static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) +static int device_resume_early(struct device *dev, pm_message_t state, bool async) { - int error; - ktime_t calltime; + pm_callback_t callback = NULL; + char *info = NULL; + int error = 0; - calltime = initcall_debug_start(dev); + TRACE_DEVICE(dev); + TRACE_RESUME(0); - error = cb(dev); - suspend_report_result(cb, error); + if (dev->power.syscore || dev->power.direct_complete) + goto Out; + + if (!dev->power.is_late_suspended) + goto Out; + + dpm_wait(dev->parent, async); + + if (dev->pm_domain) { + info = "early power domain "; + callback = pm_late_early_op(&dev->pm_domain->ops, state); + } else if (dev->type && dev->type->pm) { + info = "early type "; + callback = pm_late_early_op(dev->type->pm, state); + } else if (dev->class && dev->class->pm) { + info = "early class "; + callback = pm_late_early_op(dev->class->pm, state); + } else if (dev->bus && dev->bus->pm) { + info = "early bus "; + callback = pm_late_early_op(dev->bus->pm, state); + } + + if (!callback && dev->driver && dev->driver->pm) { + info = "early driver "; + callback = pm_late_early_op(dev->driver->pm, state); + } + + error = dpm_run_callback(callback, dev, state, info); + dev->power.is_late_suspended = false; - initcall_debug_report(dev, calltime, error); + Out: + TRACE_RESUME(error); + pm_runtime_enable(dev); + complete_all(&dev->power.completion); return error; } +static void async_resume_early(void *data, async_cookie_t cookie) +{ + struct device *dev = (struct device *)data; + int error; + + error = device_resume_early(dev, pm_transition, true); + if (error) + pm_dev_err(dev, pm_transition, " async", error); + + put_device(dev); +} + +/** + * dpm_resume_early - Execute "early resume" callbacks for all devices. + * @state: PM transition of the system being carried out. + */ +static void dpm_resume_early(pm_message_t state) +{ + struct device *dev; + ktime_t starttime = ktime_get(); + + trace_suspend_resume(TPS("dpm_resume_early"), state.event, true); + mutex_lock(&dpm_list_mtx); + pm_transition = state; + + /* + * Advanced the async threads upfront, + * in case the starting of async threads is + * delayed by non-async resuming devices. + */ + list_for_each_entry(dev, &dpm_late_early_list, power.entry) { + reinit_completion(&dev->power.completion); + if (is_async(dev)) { + get_device(dev); + async_schedule(async_resume_early, dev); + } + } + + while (!list_empty(&dpm_late_early_list)) { + dev = to_device(dpm_late_early_list.next); + get_device(dev); + list_move_tail(&dev->power.entry, &dpm_suspended_list); + mutex_unlock(&dpm_list_mtx); + + if (!is_async(dev)) { + int error; + + error = device_resume_early(dev, state, false); + if (error) { + suspend_stats.failed_resume_early++; + dpm_save_failed_step(SUSPEND_RESUME_EARLY); + dpm_save_failed_dev(dev_name(dev)); + pm_dev_err(dev, state, " early", error); + } + } + mutex_lock(&dpm_list_mtx); + put_device(dev); + } + mutex_unlock(&dpm_list_mtx); + async_synchronize_full(); + dpm_show_time(starttime, state, "early"); + trace_suspend_resume(TPS("dpm_resume_early"), state.event, false); +} + +/** + * dpm_resume_start - Execute "noirq" and "early" device callbacks. + * @state: PM transition of the system being carried out. + */ +void dpm_resume_start(pm_message_t state) +{ + dpm_resume_noirq(state); + dpm_resume_early(state); +} +EXPORT_SYMBOL_GPL(dpm_resume_start); + /** * device_resume - Execute "resume" callbacks for given device. * @dev: Device to handle. @@ -508,51 +727,90 @@ static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) */ static int device_resume(struct device *dev, pm_message_t state, bool async) { + pm_callback_t callback = NULL; + char *info = NULL; int error = 0; + DECLARE_DPM_WATCHDOG_ON_STACK(wd); TRACE_DEVICE(dev); TRACE_RESUME(0); + if (dev->power.syscore) + goto Complete; + + if (dev->power.direct_complete) { + /* Match the pm_runtime_disable() in __device_suspend(). */ + pm_runtime_enable(dev); + goto Complete; + } + dpm_wait(dev->parent, async); + dpm_watchdog_set(&wd, dev); device_lock(dev); - dev->power.in_suspend = false; + /* + * This is a fib. But we'll allow new children to be added below + * a resumed device, even if the device hasn't been completed yet. + */ + dev->power.is_prepared = false; - if (dev->bus) { - if (dev->bus->pm) { - pm_dev_dbg(dev, state, ""); - error = pm_op(dev, dev->bus->pm, state); - } else if (dev->bus->resume) { - pm_dev_dbg(dev, state, "legacy "); - error = legacy_resume(dev, dev->bus->resume); - } - if (error) - goto End; + if (!dev->power.is_suspended) + goto Unlock; + + if (dev->pm_domain) { + info = "power domain "; + callback = pm_op(&dev->pm_domain->ops, state); + goto Driver; } - if (dev->type) { - if (dev->type->pm) { - pm_dev_dbg(dev, state, "type "); - error = pm_op(dev, dev->type->pm, state); - } - if (error) - goto End; + if (dev->type && dev->type->pm) { + info = "type "; + callback = pm_op(dev->type->pm, state); + goto Driver; } if (dev->class) { if (dev->class->pm) { - pm_dev_dbg(dev, state, "class "); - error = pm_op(dev, dev->class->pm, state); + info = "class "; + callback = pm_op(dev->class->pm, state); + goto Driver; } else if (dev->class->resume) { - pm_dev_dbg(dev, state, "legacy class "); - error = legacy_resume(dev, dev->class->resume); + info = "legacy class "; + callback = dev->class->resume; + goto End; } } + + if (dev->bus) { + if (dev->bus->pm) { + info = "bus "; + callback = pm_op(dev->bus->pm, state); + } else if (dev->bus->resume) { + info = "legacy bus "; + callback = dev->bus->resume; + goto End; + } + } + + Driver: + if (!callback && dev->driver && dev->driver->pm) { + info = "driver "; + callback = pm_op(dev->driver->pm, state); + } + End: + error = dpm_run_callback(callback, dev, state, info); + dev->power.is_suspended = false; + + Unlock: device_unlock(dev); + dpm_watchdog_clear(&wd); + + Complete: complete_all(&dev->power.completion); TRACE_RESUME(error); + return error; } @@ -567,12 +825,6 @@ static void async_resume(void *data, async_cookie_t cookie) put_device(dev); } -static bool is_async(struct device *dev) -{ - return dev->power.async_suspend && pm_async_enabled - && !pm_trace_is_enabled(); -} - /** * dpm_resume - Execute "resume" callbacks for non-sysdev devices. * @state: PM transition of the system being carried out. @@ -580,17 +832,20 @@ static bool is_async(struct device *dev) * Execute the appropriate "resume" callback for all devices whose status * indicates that they are suspended. */ -static void dpm_resume(pm_message_t state) +void dpm_resume(pm_message_t state) { struct device *dev; ktime_t starttime = ktime_get(); + trace_suspend_resume(TPS("dpm_resume"), state.event, true); + might_sleep(); + mutex_lock(&dpm_list_mtx); pm_transition = state; async_error = 0; list_for_each_entry(dev, &dpm_suspended_list, power.entry) { - INIT_COMPLETION(dev->power.completion); + reinit_completion(&dev->power.completion); if (is_async(dev)) { get_device(dev); async_schedule(async_resume, dev); @@ -606,8 +861,12 @@ static void dpm_resume(pm_message_t state) mutex_unlock(&dpm_list_mtx); error = device_resume(dev, state, false); - if (error) + if (error) { + suspend_stats.failed_resume++; + dpm_save_failed_step(SUSPEND_RESUME); + dpm_save_failed_dev(dev_name(dev)); pm_dev_err(dev, state, "", error); + } mutex_lock(&dpm_list_mtx); } @@ -618,6 +877,9 @@ static void dpm_resume(pm_message_t state) mutex_unlock(&dpm_list_mtx); async_synchronize_full(); dpm_show_time(starttime, state, NULL); + + cpufreq_resume(); + trace_suspend_resume(TPS("dpm_resume"), state.event, false); } /** @@ -627,24 +889,43 @@ static void dpm_resume(pm_message_t state) */ static void device_complete(struct device *dev, pm_message_t state) { + void (*callback)(struct device *) = NULL; + char *info = NULL; + + if (dev->power.syscore) + return; + device_lock(dev); - if (dev->class && dev->class->pm && dev->class->pm->complete) { - pm_dev_dbg(dev, state, "completing class "); - dev->class->pm->complete(dev); + if (dev->pm_domain) { + info = "completing power domain "; + callback = dev->pm_domain->ops.complete; + } else if (dev->type && dev->type->pm) { + info = "completing type "; + callback = dev->type->pm->complete; + } else if (dev->class && dev->class->pm) { + info = "completing class "; + callback = dev->class->pm->complete; + } else if (dev->bus && dev->bus->pm) { + info = "completing bus "; + callback = dev->bus->pm->complete; } - if (dev->type && dev->type->pm && dev->type->pm->complete) { - pm_dev_dbg(dev, state, "completing type "); - dev->type->pm->complete(dev); + if (!callback && dev->driver && dev->driver->pm) { + info = "completing driver "; + callback = dev->driver->pm->complete; } - if (dev->bus && dev->bus->pm && dev->bus->pm->complete) { - pm_dev_dbg(dev, state, "completing "); - dev->bus->pm->complete(dev); + if (callback) { + pm_dev_dbg(dev, state, info); + trace_device_pm_callback_start(dev, info, state.event); + callback(dev); + trace_device_pm_callback_end(dev, 0); } device_unlock(dev); + + pm_runtime_put(dev); } /** @@ -654,28 +935,31 @@ static void device_complete(struct device *dev, pm_message_t state) * Execute the ->complete() callbacks for all devices whose PM status is not * DPM_ON (this allows new devices to be registered). */ -static void dpm_complete(pm_message_t state) +void dpm_complete(pm_message_t state) { struct list_head list; + trace_suspend_resume(TPS("dpm_complete"), state.event, true); + might_sleep(); + INIT_LIST_HEAD(&list); mutex_lock(&dpm_list_mtx); while (!list_empty(&dpm_prepared_list)) { struct device *dev = to_device(dpm_prepared_list.prev); get_device(dev); - dev->power.in_suspend = false; + dev->power.is_prepared = false; list_move(&dev->power.entry, &list); mutex_unlock(&dpm_list_mtx); device_complete(dev, state); - pm_runtime_put_sync(dev); mutex_lock(&dpm_list_mtx); put_device(dev); } list_splice(&list, &dpm_list); mutex_unlock(&dpm_list_mtx); + trace_suspend_resume(TPS("dpm_complete"), state.event, false); } /** @@ -687,7 +971,6 @@ static void dpm_complete(pm_message_t state) */ void dpm_resume_end(pm_message_t state) { - might_sleep(); dpm_resume(state); dpm_complete(state); } @@ -725,73 +1008,290 @@ static pm_message_t resume_event(pm_message_t sleep_state) * The driver of @dev will not receive interrupts while this function is being * executed. */ -static int device_suspend_noirq(struct device *dev, pm_message_t state) +static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async) { + pm_callback_t callback = NULL; + char *info = NULL; int error = 0; - if (dev->class && dev->class->pm) { - pm_dev_dbg(dev, state, "LATE class "); - error = pm_noirq_op(dev, dev->class->pm, state); - if (error) - goto End; + if (async_error) + goto Complete; + + if (pm_wakeup_pending()) { + async_error = -EBUSY; + goto Complete; } - if (dev->type && dev->type->pm) { - pm_dev_dbg(dev, state, "LATE type "); - error = pm_noirq_op(dev, dev->type->pm, state); - if (error) - goto End; + if (dev->power.syscore || dev->power.direct_complete) + goto Complete; + + dpm_wait_for_children(dev, async); + + if (dev->pm_domain) { + info = "noirq power domain "; + callback = pm_noirq_op(&dev->pm_domain->ops, state); + } else if (dev->type && dev->type->pm) { + info = "noirq type "; + callback = pm_noirq_op(dev->type->pm, state); + } else if (dev->class && dev->class->pm) { + info = "noirq class "; + callback = pm_noirq_op(dev->class->pm, state); + } else if (dev->bus && dev->bus->pm) { + info = "noirq bus "; + callback = pm_noirq_op(dev->bus->pm, state); } - if (dev->bus && dev->bus->pm) { - pm_dev_dbg(dev, state, "LATE "); - error = pm_noirq_op(dev, dev->bus->pm, state); + if (!callback && dev->driver && dev->driver->pm) { + info = "noirq driver "; + callback = pm_noirq_op(dev->driver->pm, state); } -End: + error = dpm_run_callback(callback, dev, state, info); + if (!error) + dev->power.is_noirq_suspended = true; + else + async_error = error; + +Complete: + complete_all(&dev->power.completion); return error; } +static void async_suspend_noirq(void *data, async_cookie_t cookie) +{ + struct device *dev = (struct device *)data; + int error; + + error = __device_suspend_noirq(dev, pm_transition, true); + if (error) { + dpm_save_failed_dev(dev_name(dev)); + pm_dev_err(dev, pm_transition, " async", error); + } + + put_device(dev); +} + +static int device_suspend_noirq(struct device *dev) +{ + reinit_completion(&dev->power.completion); + + if (pm_async_enabled && dev->power.async_suspend) { + get_device(dev); + async_schedule(async_suspend_noirq, dev); + return 0; + } + return __device_suspend_noirq(dev, pm_transition, false); +} + /** - * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. + * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices. * @state: PM transition of the system being carried out. * * Prevent device drivers from receiving interrupts and call the "noirq" suspend * handlers for all non-sysdev devices. */ -int dpm_suspend_noirq(pm_message_t state) +static int dpm_suspend_noirq(pm_message_t state) { ktime_t starttime = ktime_get(); int error = 0; + trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, true); + cpuidle_pause(); suspend_device_irqs(); mutex_lock(&dpm_list_mtx); - while (!list_empty(&dpm_suspended_list)) { - struct device *dev = to_device(dpm_suspended_list.prev); + pm_transition = state; + async_error = 0; + + while (!list_empty(&dpm_late_early_list)) { + struct device *dev = to_device(dpm_late_early_list.prev); get_device(dev); mutex_unlock(&dpm_list_mtx); - error = device_suspend_noirq(dev, state); + error = device_suspend_noirq(dev); mutex_lock(&dpm_list_mtx); if (error) { - pm_dev_err(dev, state, " late", error); + pm_dev_err(dev, state, " noirq", error); + dpm_save_failed_dev(dev_name(dev)); put_device(dev); break; } if (!list_empty(&dev->power.entry)) list_move(&dev->power.entry, &dpm_noirq_list); put_device(dev); + + if (async_error) + break; } mutex_unlock(&dpm_list_mtx); - if (error) + async_synchronize_full(); + if (!error) + error = async_error; + + if (error) { + suspend_stats.failed_suspend_noirq++; + dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ); dpm_resume_noirq(resume_event(state)); + } else { + dpm_show_time(starttime, state, "noirq"); + } + trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false); + return error; +} + +/** + * device_suspend_late - Execute a "late suspend" callback for given device. + * @dev: Device to handle. + * @state: PM transition of the system being carried out. + * + * Runtime PM is disabled for @dev while this function is being executed. + */ +static int __device_suspend_late(struct device *dev, pm_message_t state, bool async) +{ + pm_callback_t callback = NULL; + char *info = NULL; + int error = 0; + + __pm_runtime_disable(dev, false); + + if (async_error) + goto Complete; + + if (pm_wakeup_pending()) { + async_error = -EBUSY; + goto Complete; + } + + if (dev->power.syscore || dev->power.direct_complete) + goto Complete; + + dpm_wait_for_children(dev, async); + + if (dev->pm_domain) { + info = "late power domain "; + callback = pm_late_early_op(&dev->pm_domain->ops, state); + } else if (dev->type && dev->type->pm) { + info = "late type "; + callback = pm_late_early_op(dev->type->pm, state); + } else if (dev->class && dev->class->pm) { + info = "late class "; + callback = pm_late_early_op(dev->class->pm, state); + } else if (dev->bus && dev->bus->pm) { + info = "late bus "; + callback = pm_late_early_op(dev->bus->pm, state); + } + + if (!callback && dev->driver && dev->driver->pm) { + info = "late driver "; + callback = pm_late_early_op(dev->driver->pm, state); + } + + error = dpm_run_callback(callback, dev, state, info); + if (!error) + dev->power.is_late_suspended = true; else + async_error = error; + +Complete: + complete_all(&dev->power.completion); + return error; +} + +static void async_suspend_late(void *data, async_cookie_t cookie) +{ + struct device *dev = (struct device *)data; + int error; + + error = __device_suspend_late(dev, pm_transition, true); + if (error) { + dpm_save_failed_dev(dev_name(dev)); + pm_dev_err(dev, pm_transition, " async", error); + } + put_device(dev); +} + +static int device_suspend_late(struct device *dev) +{ + reinit_completion(&dev->power.completion); + + if (pm_async_enabled && dev->power.async_suspend) { + get_device(dev); + async_schedule(async_suspend_late, dev); + return 0; + } + + return __device_suspend_late(dev, pm_transition, false); +} + +/** + * dpm_suspend_late - Execute "late suspend" callbacks for all devices. + * @state: PM transition of the system being carried out. + */ +static int dpm_suspend_late(pm_message_t state) +{ + ktime_t starttime = ktime_get(); + int error = 0; + + trace_suspend_resume(TPS("dpm_suspend_late"), state.event, true); + mutex_lock(&dpm_list_mtx); + pm_transition = state; + async_error = 0; + + while (!list_empty(&dpm_suspended_list)) { + struct device *dev = to_device(dpm_suspended_list.prev); + + get_device(dev); + mutex_unlock(&dpm_list_mtx); + + error = device_suspend_late(dev); + + mutex_lock(&dpm_list_mtx); + if (error) { + pm_dev_err(dev, state, " late", error); + dpm_save_failed_dev(dev_name(dev)); + put_device(dev); + break; + } + if (!list_empty(&dev->power.entry)) + list_move(&dev->power.entry, &dpm_late_early_list); + put_device(dev); + + if (async_error) + break; + } + mutex_unlock(&dpm_list_mtx); + async_synchronize_full(); + if (error) { + suspend_stats.failed_suspend_late++; + dpm_save_failed_step(SUSPEND_SUSPEND_LATE); + dpm_resume_early(resume_event(state)); + } else { dpm_show_time(starttime, state, "late"); + } + trace_suspend_resume(TPS("dpm_suspend_late"), state.event, false); return error; } -EXPORT_SYMBOL_GPL(dpm_suspend_noirq); + +/** + * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks. + * @state: PM transition of the system being carried out. + */ +int dpm_suspend_end(pm_message_t state) +{ + int error = dpm_suspend_late(state); + if (error) + return error; + + error = dpm_suspend_noirq(state); + if (error) { + dpm_resume_early(resume_event(state)); + return error; + } + + return 0; +} +EXPORT_SYMBOL_GPL(dpm_suspend_end); /** * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. @@ -800,17 +1300,20 @@ EXPORT_SYMBOL_GPL(dpm_suspend_noirq); * @cb: Suspend callback to execute. */ static int legacy_suspend(struct device *dev, pm_message_t state, - int (*cb)(struct device *dev, pm_message_t state)) + int (*cb)(struct device *dev, pm_message_t state), + char *info) { int error; ktime_t calltime; calltime = initcall_debug_start(dev); + trace_device_pm_callback_start(dev, info, state.event); error = cb(dev, state); + trace_device_pm_callback_end(dev, error); suspend_report_result(cb, error); - initcall_debug_report(dev, calltime, error); + initcall_debug_report(dev, calltime, error, state, info); return error; } @@ -823,54 +1326,114 @@ static int legacy_suspend(struct device *dev, pm_message_t state, */ static int __device_suspend(struct device *dev, pm_message_t state, bool async) { + pm_callback_t callback = NULL; + char *info = NULL; int error = 0; + DECLARE_DPM_WATCHDOG_ON_STACK(wd); dpm_wait_for_children(dev, async); - device_lock(dev); if (async_error) - goto End; + goto Complete; + + /* + * If a device configured to wake up the system from sleep states + * has been suspended at run time and there's a resume request pending + * for it, this is equivalent to the device signaling wakeup, so the + * system suspend operation should be aborted. + */ + if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) + pm_wakeup_event(dev, 0); if (pm_wakeup_pending()) { async_error = -EBUSY; - goto End; + goto Complete; + } + + if (dev->power.syscore) + goto Complete; + + if (dev->power.direct_complete) { + if (pm_runtime_status_suspended(dev)) { + pm_runtime_disable(dev); + if (pm_runtime_suspended_if_enabled(dev)) + goto Complete; + + pm_runtime_enable(dev); + } + dev->power.direct_complete = false; + } + + dpm_watchdog_set(&wd, dev); + device_lock(dev); + + if (dev->pm_domain) { + info = "power domain "; + callback = pm_op(&dev->pm_domain->ops, state); + goto Run; + } + + if (dev->type && dev->type->pm) { + info = "type "; + callback = pm_op(dev->type->pm, state); + goto Run; } if (dev->class) { if (dev->class->pm) { - pm_dev_dbg(dev, state, "class "); - error = pm_op(dev, dev->class->pm, state); + info = "class "; + callback = pm_op(dev->class->pm, state); + goto Run; } else if (dev->class->suspend) { pm_dev_dbg(dev, state, "legacy class "); - error = legacy_suspend(dev, state, dev->class->suspend); - } - if (error) + error = legacy_suspend(dev, state, dev->class->suspend, + "legacy class "); goto End; - } - - if (dev->type) { - if (dev->type->pm) { - pm_dev_dbg(dev, state, "type "); - error = pm_op(dev, dev->type->pm, state); } - if (error) - goto End; } if (dev->bus) { if (dev->bus->pm) { - pm_dev_dbg(dev, state, ""); - error = pm_op(dev, dev->bus->pm, state); + info = "bus "; + callback = pm_op(dev->bus->pm, state); } else if (dev->bus->suspend) { - pm_dev_dbg(dev, state, "legacy "); - error = legacy_suspend(dev, state, dev->bus->suspend); + pm_dev_dbg(dev, state, "legacy bus "); + error = legacy_suspend(dev, state, dev->bus->suspend, + "legacy bus "); + goto End; } } + Run: + if (!callback && dev->driver && dev->driver->pm) { + info = "driver "; + callback = pm_op(dev->driver->pm, state); + } + + error = dpm_run_callback(callback, dev, state, info); + End: + if (!error) { + struct device *parent = dev->parent; + + dev->power.is_suspended = true; + if (parent) { + spin_lock_irq(&parent->power.lock); + + dev->parent->power.direct_complete = false; + if (dev->power.wakeup_path + && !dev->parent->power.ignore_children) + dev->parent->power.wakeup_path = true; + + spin_unlock_irq(&parent->power.lock); + } + } + device_unlock(dev); - complete_all(&dev->power.completion); + dpm_watchdog_clear(&wd); + Complete: + complete_all(&dev->power.completion); if (error) async_error = error; @@ -883,15 +1446,17 @@ static void async_suspend(void *data, async_cookie_t cookie) int error; error = __device_suspend(dev, pm_transition, true); - if (error) + if (error) { + dpm_save_failed_dev(dev_name(dev)); pm_dev_err(dev, pm_transition, " async", error); + } put_device(dev); } static int device_suspend(struct device *dev) { - INIT_COMPLETION(dev->power.completion); + reinit_completion(&dev->power.completion); if (pm_async_enabled && dev->power.async_suspend) { get_device(dev); @@ -906,11 +1471,16 @@ static int device_suspend(struct device *dev) * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. * @state: PM transition of the system being carried out. */ -static int dpm_suspend(pm_message_t state) +int dpm_suspend(pm_message_t state) { ktime_t starttime = ktime_get(); int error = 0; + trace_suspend_resume(TPS("dpm_suspend"), state.event, true); + might_sleep(); + + cpufreq_suspend(); + mutex_lock(&dpm_list_mtx); pm_transition = state; async_error = 0; @@ -925,6 +1495,7 @@ static int dpm_suspend(pm_message_t state) mutex_lock(&dpm_list_mtx); if (error) { pm_dev_err(dev, state, "", error); + dpm_save_failed_dev(dev_name(dev)); put_device(dev); break; } @@ -938,8 +1509,12 @@ static int dpm_suspend(pm_message_t state) async_synchronize_full(); if (!error) error = async_error; - if (!error) + if (error) { + suspend_stats.failed_suspend++; + dpm_save_failed_step(SUSPEND_SUSPEND); + } else dpm_show_time(starttime, state, NULL); + trace_suspend_resume(TPS("dpm_suspend"), state.event, false); return error; } @@ -953,35 +1528,68 @@ static int dpm_suspend(pm_message_t state) */ static int device_prepare(struct device *dev, pm_message_t state) { - int error = 0; + int (*callback)(struct device *) = NULL; + char *info = NULL; + int ret = 0; + + if (dev->power.syscore) + return 0; + + /* + * If a device's parent goes into runtime suspend at the wrong time, + * it won't be possible to resume the device. To prevent this we + * block runtime suspend here, during the prepare phase, and allow + * it again during the complete phase. + */ + pm_runtime_get_noresume(dev); device_lock(dev); - if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) { - pm_dev_dbg(dev, state, "preparing "); - error = dev->bus->pm->prepare(dev); - suspend_report_result(dev->bus->pm->prepare, error); - if (error) - goto End; + dev->power.wakeup_path = device_may_wakeup(dev); + + if (dev->pm_domain) { + info = "preparing power domain "; + callback = dev->pm_domain->ops.prepare; + } else if (dev->type && dev->type->pm) { + info = "preparing type "; + callback = dev->type->pm->prepare; + } else if (dev->class && dev->class->pm) { + info = "preparing class "; + callback = dev->class->pm->prepare; + } else if (dev->bus && dev->bus->pm) { + info = "preparing bus "; + callback = dev->bus->pm->prepare; } - if (dev->type && dev->type->pm && dev->type->pm->prepare) { - pm_dev_dbg(dev, state, "preparing type "); - error = dev->type->pm->prepare(dev); - suspend_report_result(dev->type->pm->prepare, error); - if (error) - goto End; + if (!callback && dev->driver && dev->driver->pm) { + info = "preparing driver "; + callback = dev->driver->pm->prepare; } - if (dev->class && dev->class->pm && dev->class->pm->prepare) { - pm_dev_dbg(dev, state, "preparing class "); - error = dev->class->pm->prepare(dev); - suspend_report_result(dev->class->pm->prepare, error); + if (callback) { + trace_device_pm_callback_start(dev, info, state.event); + ret = callback(dev); + trace_device_pm_callback_end(dev, ret); } - End: + device_unlock(dev); - return error; + if (ret < 0) { + suspend_report_result(callback, ret); + pm_runtime_put(dev); + return ret; + } + /* + * A positive return value from ->prepare() means "this device appears + * to be runtime-suspended and its state is fine, so if it really is + * runtime-suspended, you can leave it in that state provided that you + * will do the same thing with all of its descendants". This only + * applies to suspend transitions, however. + */ + spin_lock_irq(&dev->power.lock); + dev->power.direct_complete = ret > 0 && state.event == PM_EVENT_SUSPEND; + spin_unlock_irq(&dev->power.lock); + return 0; } /** @@ -990,10 +1598,13 @@ static int device_prepare(struct device *dev, pm_message_t state) * * Execute the ->prepare() callback(s) for all devices. */ -static int dpm_prepare(pm_message_t state) +int dpm_prepare(pm_message_t state) { int error = 0; + trace_suspend_resume(TPS("dpm_prepare"), state.event, true); + might_sleep(); + mutex_lock(&dpm_list_mtx); while (!list_empty(&dpm_list)) { struct device *dev = to_device(dpm_list.next); @@ -1001,16 +1612,7 @@ static int dpm_prepare(pm_message_t state) get_device(dev); mutex_unlock(&dpm_list_mtx); - pm_runtime_get_noresume(dev); - if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) - pm_wakeup_event(dev, 0); - - if (pm_wakeup_pending()) { - pm_runtime_put_sync(dev); - error = -EBUSY; - } else { - error = device_prepare(dev, state); - } + error = device_prepare(dev, state); mutex_lock(&dpm_list_mtx); if (error) { @@ -1025,12 +1627,13 @@ static int dpm_prepare(pm_message_t state) put_device(dev); break; } - dev->power.in_suspend = true; + dev->power.is_prepared = true; if (!list_empty(&dev->power.entry)) list_move_tail(&dev->power.entry, &dpm_prepared_list); put_device(dev); } mutex_unlock(&dpm_list_mtx); + trace_suspend_resume(TPS("dpm_prepare"), state.event, false); return error; } @@ -1045,9 +1648,11 @@ int dpm_suspend_start(pm_message_t state) { int error; - might_sleep(); error = dpm_prepare(state); - if (!error) + if (error) { + suspend_stats.failed_prepare++; + dpm_save_failed_step(SUSPEND_PREPARE); + } else error = dpm_suspend(state); return error; } @@ -1071,3 +1676,25 @@ int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) return async_error; } EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); + +/** + * dpm_for_each_dev - device iterator. + * @data: data for the callback. + * @fn: function to be called for each device. + * + * Iterate over devices in dpm_list, and call @fn for each device, + * passing it @data. + */ +void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)) +{ + struct device *dev; + + if (!fn) + return; + + device_pm_lock(); + list_for_each_entry(dev, &dpm_list, power.entry) + fn(dev, data); + device_pm_unlock(); +} +EXPORT_SYMBOL_GPL(dpm_for_each_dev); |