diff options
Diffstat (limited to 'drivers/base/power/runtime.c')
| -rw-r--r-- | drivers/base/power/runtime.c | 944 |
1 files changed, 503 insertions, 441 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index b78c401..1dd8676 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -2,17 +2,55 @@ * drivers/base/power/runtime.c - Helper functions for device run-time PM * * Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. + * Copyright (C) 2010 Alan Stern <stern@rowland.harvard.edu> * * This file is released under the GPLv2. */ #include <linux/sched.h> #include <linux/pm_runtime.h> -#include <linux/jiffies.h> +#include "power.h" -static int __pm_runtime_resume(struct device *dev, bool from_wq); -static int __pm_request_idle(struct device *dev); -static int __pm_request_resume(struct device *dev); +static int rpm_resume(struct device *dev, int rpmflags); +static int rpm_suspend(struct device *dev, int rpmflags); + +/** + * update_pm_runtime_accounting - Update the time accounting of power states + * @dev: Device to update the accounting for + * + * In order to be able to have time accounting of the various power states + * (as used by programs such as PowerTOP to show the effectiveness of runtime + * PM), we need to track the time spent in each state. + * update_pm_runtime_accounting must be called each time before the + * runtime_status field is updated, to account the time in the old state + * correctly. + */ +void update_pm_runtime_accounting(struct device *dev) +{ + unsigned long now = jiffies; + int delta; + + delta = now - dev->power.accounting_timestamp; + + if (delta < 0) + delta = 0; + + dev->power.accounting_timestamp = now; + + if (dev->power.disable_depth > 0) + return; + + if (dev->power.runtime_status == RPM_SUSPENDED) + dev->power.suspended_jiffies += delta; + else + dev->power.active_jiffies += delta; +} + +static void __update_runtime_status(struct device *dev, enum rpm_status status) +{ + update_pm_runtime_accounting(dev); + dev->power.runtime_status = status; +} /** * pm_runtime_deactivate_timer - Deactivate given device's suspend timer. @@ -40,62 +78,154 @@ static void pm_runtime_cancel_pending(struct device *dev) dev->power.request = RPM_REQ_NONE; } -/** - * __pm_runtime_idle - Notify device bus type if the device can be suspended. - * @dev: Device to notify the bus type about. +/* + * pm_runtime_autosuspend_expiration - Get a device's autosuspend-delay expiration time. + * @dev: Device to handle. * - * This function must be called under dev->power.lock with interrupts disabled. + * Compute the autosuspend-delay expiration time based on the device's + * power.last_busy time. If the delay has already expired or is disabled + * (negative) or the power.use_autosuspend flag isn't set, return 0. + * Otherwise return the expiration time in jiffies (adjusted to be nonzero). + * + * This function may be called either with or without dev->power.lock held. + * Either way it can be racy, since power.last_busy may be updated at any time. */ -static int __pm_runtime_idle(struct device *dev) - __releases(&dev->power.lock) __acquires(&dev->power.lock) +unsigned long pm_runtime_autosuspend_expiration(struct device *dev) +{ + int autosuspend_delay; + long elapsed; + unsigned long last_busy; + unsigned long expires = 0; + + if (!dev->power.use_autosuspend) + goto out; + + autosuspend_delay = ACCESS_ONCE(dev->power.autosuspend_delay); + if (autosuspend_delay < 0) + goto out; + + last_busy = ACCESS_ONCE(dev->power.last_busy); + elapsed = jiffies - last_busy; + if (elapsed < 0) + goto out; /* jiffies has wrapped around. */ + + /* + * If the autosuspend_delay is >= 1 second, align the timer by rounding + * up to the nearest second. + */ + expires = last_busy + msecs_to_jiffies(autosuspend_delay); + if (autosuspend_delay >= 1000) + expires = round_jiffies(expires); + expires += !expires; + if (elapsed >= expires - last_busy) + expires = 0; /* Already expired. */ + + out: + return expires; +} +EXPORT_SYMBOL_GPL(pm_runtime_autosuspend_expiration); + +/** + * rpm_check_suspend_allowed - Test whether a device may be suspended. + * @dev: Device to test. + */ +static int rpm_check_suspend_allowed(struct device *dev) { int retval = 0; if (dev->power.runtime_error) retval = -EINVAL; - else if (dev->power.idle_notification) - retval = -EINPROGRESS; else if (atomic_read(&dev->power.usage_count) > 0 - || dev->power.disable_depth > 0 - || dev->power.runtime_status != RPM_ACTIVE) + || dev->power.disable_depth > 0) retval = -EAGAIN; else if (!pm_children_suspended(dev)) retval = -EBUSY; + + /* Pending resume requests take precedence over suspends. */ + else if ((dev->power.deferred_resume + && dev->power.status == RPM_SUSPENDING) + || (dev->power.request_pending + && dev->power.request == RPM_REQ_RESUME)) + retval = -EAGAIN; + else if (dev->power.runtime_status == RPM_SUSPENDED) + retval = 1; + + return retval; +} + +/** + * rpm_idle - Notify device bus type if the device can be suspended. + * @dev: Device to notify the bus type about. + * @rpmflags: Flag bits. + * + * Check if the device's run-time PM status allows it to be suspended. If + * another idle notification has been started earlier, return immediately. If + * the RPM_ASYNC flag is set then queue an idle-notification request; otherwise + * run the ->runtime_idle() callback directly. + * + * This function must be called under dev->power.lock with interrupts disabled. + */ +static int rpm_idle(struct device *dev, int rpmflags) +{ + int (*callback)(struct device *); + int retval; + + retval = rpm_check_suspend_allowed(dev); + if (retval < 0) + ; /* Conditions are wrong. */ + + /* Idle notifications are allowed only in the RPM_ACTIVE state. */ + else if (dev->power.runtime_status != RPM_ACTIVE) + retval = -EAGAIN; + + /* + * Any pending request other than an idle notification takes + * precedence over us, except that the timer may be running. + */ + else if (dev->power.request_pending && + dev->power.request > RPM_REQ_IDLE) + retval = -EAGAIN; + + /* Act as though RPM_NOWAIT is always set. */ + else if (dev->power.idle_notification) + retval = -EINPROGRESS; if (retval) goto out; - if (dev->power.request_pending) { - /* - * If an idle notification request is pending, cancel it. Any - * other pending request takes precedence over us. - */ - if (dev->power.request == RPM_REQ_IDLE) { - dev->power.request = RPM_REQ_NONE; - } else if (dev->power.request != RPM_REQ_NONE) { - retval = -EAGAIN; - goto out; + /* Pending requests need to be canceled. */ + dev->power.request = RPM_REQ_NONE; + + if (dev->power.no_callbacks) { + /* Assume ->runtime_idle() callback would have suspended. */ + retval = rpm_suspend(dev, rpmflags); + goto out; + } + + /* Carry out an asynchronous or a synchronous idle notification. */ + if (rpmflags & RPM_ASYNC) { + dev->power.request = RPM_REQ_IDLE; + if (!dev->power.request_pending) { + dev->power.request_pending = true; + queue_work(pm_wq, &dev->power.work); } + goto out; } dev->power.idle_notification = true; - if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_idle) { - spin_unlock_irq(&dev->power.lock); - - dev->bus->pm->runtime_idle(dev); - - spin_lock_irq(&dev->power.lock); - } else if (dev->type && dev->type->pm && dev->type->pm->runtime_idle) { - spin_unlock_irq(&dev->power.lock); - - dev->type->pm->runtime_idle(dev); + if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_idle) + callback = dev->bus->pm->runtime_idle; + else if (dev->type && dev->type->pm && dev->type->pm->runtime_idle) + callback = dev->type->pm->runtime_idle; + else if (dev->class && dev->class->pm) + callback = dev->class->pm->runtime_idle; + else + callback = NULL; - spin_lock_irq(&dev->power.lock); - } else if (dev->class && dev->class->pm - && dev->class->pm->runtime_idle) { + if (callback) { spin_unlock_irq(&dev->power.lock); - dev->class->pm->runtime_idle(dev); + callback(dev); spin_lock_irq(&dev->power.lock); } @@ -108,113 +238,99 @@ static int __pm_runtime_idle(struct device *dev) } /** - * pm_runtime_idle - Notify device bus type if the device can be suspended. - * @dev: Device to notify the bus type about. + * rpm_callback - Run a given runtime PM callback for a given device. + * @cb: Runtime PM callback to run. + * @dev: Device to run the callback for. */ -int pm_runtime_idle(struct device *dev) +static int rpm_callback(int (*cb)(struct device *), struct device *dev) + __releases(&dev->power.lock) __acquires(&dev->power.lock) { int retval; - spin_lock_irq(&dev->power.lock); - retval = __pm_runtime_idle(dev); - spin_unlock_irq(&dev->power.lock); + if (!cb) + return -ENOSYS; - return retval; -} -EXPORT_SYMBOL_GPL(pm_runtime_idle); - - -/** - * update_pm_runtime_accounting - Update the time accounting of power states - * @dev: Device to update the accounting for - * - * In order to be able to have time accounting of the various power states - * (as used by programs such as PowerTOP to show the effectiveness of runtime - * PM), we need to track the time spent in each state. - * update_pm_runtime_accounting must be called each time before the - * runtime_status field is updated, to account the time in the old state - * correctly. - */ -void update_pm_runtime_accounting(struct device *dev) -{ - unsigned long now = jiffies; - int delta; - - delta = now - dev->power.accounting_timestamp; - - if (delta < 0) - delta = 0; + spin_unlock_irq(&dev->power.lock); - dev->power.accounting_timestamp = now; + retval = cb(dev); - if (dev->power.disable_depth > 0) - return; - - if (dev->power.runtime_status == RPM_SUSPENDED) - dev->power.suspended_jiffies += delta; - else - dev->power.active_jiffies += delta; -} + spin_lock_irq(&dev->power.lock); + dev->power.runtime_error = retval; -static void __update_runtime_status(struct device *dev, enum rpm_status status) -{ - update_pm_runtime_accounting(dev); - dev->power.runtime_status = status; + return retval; } /** - * __pm_runtime_suspend - Carry out run-time suspend of given device. + * rpm_suspend - Carry out run-time suspend of given device. * @dev: Device to suspend. - * @from_wq: If set, the function has been called via pm_wq. + * @rpmflags: Flag bits. * - * Check if the device can be suspended and run the ->runtime_suspend() callback - * provided by its bus type. If another suspend has been started earlier, wait - * for it to finish. If an idle notification or suspend request is pending or - * scheduled, cancel it. + * Check if the device's run-time PM status allows it to be suspended. If + * another suspend has been started earlier, either return immediately or wait + * for it to finish, depending on the RPM_NOWAIT and RPM_ASYNC flags. Cancel a + * pending idle notification. If the RPM_ASYNC flag is set then queue a + * suspend request; otherwise run the ->runtime_suspend() callback directly. + * If a deferred resume was requested while the callback was running then carry + * it out; otherwise send an idle notification for the device (if the suspend + * failed) or for its parent (if the suspend succeeded). * * This function must be called under dev->power.lock with interrupts disabled. */ -int __pm_runtime_suspend(struct device *dev, bool from_wq) +static int rpm_suspend(struct device *dev, int rpmflags) __releases(&dev->power.lock) __acquires(&dev->power.lock) { + int (*callback)(struct device *); struct device *parent = NULL; - bool notify = false; - int retval = 0; + int retval; - dev_dbg(dev, "__pm_runtime_suspend()%s!\n", - from_wq ? " from workqueue" : ""); + dev_dbg(dev, "%s flags 0x%x\n", __func__, rpmflags); repeat: - if (dev->power.runtime_error) { - retval = -EINVAL; - goto out; - } + retval = rpm_check_suspend_allowed(dev); - /* Pending resume requests take precedence over us. */ - if (dev->power.request_pending - && dev->power.request == RPM_REQ_RESUME) { + if (retval < 0) + ; /* Conditions are wrong. */ + + /* Synchronous suspends are not allowed in the RPM_RESUMING state. */ + else if (dev->power.runtime_status == RPM_RESUMING && + !(rpmflags & RPM_ASYNC)) retval = -EAGAIN; + if (retval) goto out; + + /* If the autosuspend_delay time hasn't expired yet, reschedule. */ + if ((rpmflags & RPM_AUTO) + && dev->power.runtime_status != RPM_SUSPENDING) { + unsigned long expires = pm_runtime_autosuspend_expiration(dev); + + if (expires != 0) { + /* Pending requests need to be canceled. */ + dev->power.request = RPM_REQ_NONE; + + /* + * Optimization: If the timer is already running and is + * set to expire at or before the autosuspend delay, + * avoid the overhead of resetting it. Just let it + * expire; pm_suspend_timer_fn() will take care of the + * rest. + */ + if (!(dev->power.timer_expires && time_before_eq( + dev->power.timer_expires, expires))) { + dev->power.timer_expires = expires; + mod_timer(&dev->power.suspend_timer, expires); + } + dev->power.timer_autosuspends = 1; + goto out; + } } /* Other scheduled or pending requests need to be canceled. */ pm_runtime_cancel_pending(dev); - if (dev->power.runtime_status == RPM_SUSPENDED) - retval = 1; - else if (dev->power.runtime_status == RPM_RESUMING - || dev->power.disable_depth > 0 - || atomic_read(&dev->power.usage_count) > 0) - retval = -EAGAIN; - else if (!pm_children_suspended(dev)) - retval = -EBUSY; - if (retval) - goto out; - if (dev->power.runtime_status == RPM_SUSPENDING) { DEFINE_WAIT(wait); - if (from_wq) { + if (rpmflags & (RPM_ASYNC | RPM_NOWAIT)) { retval = -EINPROGRESS; goto out; } @@ -236,46 +352,42 @@ int __pm_runtime_suspend(struct device *dev, bool from_wq) goto repeat; } - __update_runtime_status(dev, RPM_SUSPENDING); dev->power.deferred_resume = false; + if (dev->power.no_callbacks) + goto no_callback; /* Assume success. */ + + /* Carry out an asynchronous or a synchronous suspend. */ + if (rpmflags & RPM_ASYNC) { + dev->power.request = (rpmflags & RPM_AUTO) ? + RPM_REQ_AUTOSUSPEND : RPM_REQ_SUSPEND; + if (!dev->power.request_pending) { + dev->power.request_pending = true; + queue_work(pm_wq, &dev->power.work); + } + goto out; + } - if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_suspend) { - spin_unlock_irq(&dev->power.lock); - - retval = dev->bus->pm->runtime_suspend(dev); - - spin_lock_irq(&dev->power.lock); - dev->power.runtime_error = retval; - } else if (dev->type && dev->type->pm - && dev->type->pm->runtime_suspend) { - spin_unlock_irq(&dev->power.lock); - - retval = dev->type->pm->runtime_suspend(dev); - - spin_lock_irq(&dev->power.lock); - dev->power.runtime_error = retval; - } else if (dev->class && dev->class->pm - && dev->class->pm->runtime_suspend) { - spin_unlock_irq(&dev->power.lock); - - retval = dev->class->pm->runtime_suspend(dev); + __update_runtime_status(dev, RPM_SUSPENDING); - spin_lock_irq(&dev->power.lock); - dev->power.runtime_error = retval; - } else { - retval = -ENOSYS; - } + if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_suspend) + callback = dev->bus->pm->runtime_suspend; + else if (dev->type && dev->type->pm && dev->type->pm->runtime_suspend) + callback = dev->type->pm->runtime_suspend; + else if (dev->class && dev->class->pm) + callback = dev->class->pm->runtime_suspend; + else + callback = NULL; + retval = rpm_callback(callback, dev); if (retval) { __update_runtime_status(dev, RPM_ACTIVE); - if (retval == -EAGAIN || retval == -EBUSY) { - if (dev->power.timer_expires == 0) - notify = true; + dev->power.deferred_resume = 0; + if (retval == -EAGAIN || retval == -EBUSY) dev->power.runtime_error = 0; - } else { + else pm_runtime_cancel_pending(dev); - } } else { + no_callback: __update_runtime_status(dev, RPM_SUSPENDED); pm_runtime_deactivate_timer(dev); @@ -287,14 +399,11 @@ int __pm_runtime_suspend(struct device *dev, bool from_wq) wake_up_all(&dev->power.wait_queue); if (dev->power.deferred_resume) { - __pm_runtime_resume(dev, false); + rpm_resume(dev, 0); retval = -EAGAIN; goto out; } - if (notify) - __pm_runtime_idle(dev); - if (parent && !parent->power.ignore_children) { spin_unlock_irq(&dev->power.lock); @@ -304,72 +413,69 @@ int __pm_runtime_suspend(struct device *dev, bool from_wq) } out: - dev_dbg(dev, "__pm_runtime_suspend() returns %d!\n", retval); - - return retval; -} - -/** - * pm_runtime_suspend - Carry out run-time suspend of given device. - * @dev: Device to suspend. - */ -int pm_runtime_suspend(struct device *dev) -{ - int retval; - - spin_lock_irq(&dev->power.lock); - retval = __pm_runtime_suspend(dev, false); - spin_unlock_irq(&dev->power.lock); + dev_dbg(dev, "%s returns %d\n", __func__, retval); return retval; } -EXPORT_SYMBOL_GPL(pm_runtime_suspend); /** - * __pm_runtime_resume - Carry out run-time resume of given device. + * rpm_resume - Carry out run-time resume of given device. * @dev: Device to resume. - * @from_wq: If set, the function has been called via pm_wq. + * @rpmflags: Flag bits. * - * Check if the device can be woken up and run the ->runtime_resume() callback - * provided by its bus type. If another resume has been started earlier, wait - * for it to finish. If there's a suspend running in parallel with this - * function, wait for it to finish and resume the device. Cancel any scheduled - * or pending requests. + * Check if the device's run-time PM status allows it to be resumed. Cancel + * any scheduled or pending requests. If another resume has been started + * earlier, either return imediately or wait for it to finish, depending on the + * RPM_NOWAIT and RPM_ASYNC flags. Similarly, if there's a suspend running in + * parallel with this function, either tell the other process to resume after + * suspending (deferred_resume) or wait for it to finish. If the RPM_ASYNC + * flag is set then queue a resume request; otherwise run the + * ->runtime_resume() callback directly. Queue an idle notification for the + * device if the resume succeeded. * * This function must be called under dev->power.lock with interrupts disabled. */ -int __pm_runtime_resume(struct device *dev, bool from_wq) +static int rpm_resume(struct device *dev, int rpmflags) __releases(&dev->power.lock) __acquires(&dev->power.lock) { + int (*callback)(struct device *); struct device *parent = NULL; int retval = 0; - dev_dbg(dev, "__pm_runtime_resume()%s!\n", - from_wq ? " from workqueue" : ""); + dev_dbg(dev, "%s flags 0x%x\n", __func__, rpmflags); repeat: - if (dev->power.runtime_error) { + if (dev->power.runtime_error) retval = -EINVAL; + else if (dev->power.disable_depth > 0) + retval = -EAGAIN; + if (retval) goto out; - } - pm_runtime_cancel_pending(dev); + /* + * Other scheduled or pending requests need to be canceled. Small + * optimization: If an autosuspend timer is running, leave it running + * rather than cancelling it now only to restart it again in the near + * future. + */ + dev->power.request = RPM_REQ_NONE; + if (!dev->power.timer_autosuspends) + pm_runtime_deactivate_timer(dev); - if (dev->power.runtime_status == RPM_ACTIVE) + if (dev->power.runtime_status == RPM_ACTIVE) { retval = 1; - else if (dev->power.disable_depth > 0) - retval = -EAGAIN; - if (retval) goto out; + } if (dev->power.runtime_status == RPM_RESUMING || dev->power.runtime_status == RPM_SUSPENDING) { DEFINE_WAIT(wait); - if (from_wq) { + if (rpmflags & (RPM_ASYNC | RPM_NOWAIT)) { if (dev->power.runtime_status == RPM_SUSPENDING) dev->power.deferred_resume = true; - retval = -EINPROGRESS; + else + retval = -EINPROGRESS; goto out; } @@ -391,6 +497,34 @@ int __pm_runtime_resume(struct device *dev, bool from_wq) goto repeat; } + /* + * See if we can skip waking up the parent. This is safe only if + * power.no_callbacks is set, because otherwise we don't know whether + * the resume will actually succeed. + */ + if (dev->power.no_callbacks && !parent && dev->parent) { + spin_lock(&dev->parent->power.lock); + if (dev->parent->power.disable_depth > 0 + || dev->parent->power.ignore_children + || dev->parent->power.runtime_status == RPM_ACTIVE) { + atomic_inc(&dev->parent->power.child_count); + spin_unlock(&dev->parent->power.lock); + goto no_callback; /* Assume success. */ + } + spin_unlock(&dev->parent->power.lock); + } + + /* Carry out an asynchronous or a synchronous resume. */ + if (rpmflags & RPM_ASYNC) { + dev->power.request = RPM_REQ_RESUME; + if (!dev->power.request_pending) { + dev->power.request_pending = true; + queue_work(pm_wq, &dev->power.work); + } + retval = 0; + goto out; + } + if (!parent && dev->parent) { /* * Increment the parent's resume counter and resume it if @@ -408,7 +542,7 @@ int __pm_runtime_resume(struct device *dev, bool from_wq) */ if (!parent->power.disable_depth && !parent->power.ignore_children) { - __pm_runtime_resume(parent, false); + rpm_resume(parent, 0); if (parent->power.runtime_status != RPM_ACTIVE) retval = -EBUSY; } @@ -420,39 +554,26 @@ int __pm_runtime_resume(struct device *dev, bool from_wq) goto repeat; } - __update_runtime_status(dev, RPM_RESUMING); - - if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_resume) { - spin_unlock_irq(&dev->power.lock); - - retval = dev->bus->pm->runtime_resume(dev); - - spin_lock_irq(&dev->power.lock); - dev->power.runtime_error = retval; - } else if (dev->type && dev->type->pm - && dev->type->pm->runtime_resume) { - spin_unlock_irq(&dev->power.lock); - - retval = dev->type->pm->runtime_resume(dev); + if (dev->power.no_callbacks) + goto no_callback; /* Assume success. */ - spin_lock_irq(&dev->power.lock); - dev->power.runtime_error = retval; - } else if (dev->class && dev->class->pm - && dev->class->pm->runtime_resume) { - spin_unlock_irq(&dev->power.lock); - - retval = dev->class->pm->runtime_resume(dev); + __update_runtime_status(dev, RPM_RESUMING); - spin_lock_irq(&dev->power.lock); - dev->power.runtime_error = retval; - } else { - retval = -ENOSYS; - } + if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_resume) + callback = dev->bus->pm->runtime_resume; + else if (dev->type && dev->type->pm && dev->type->pm->runtime_resume) + callback = dev->type->pm->runtime_resume; + else if (dev->class && dev->class->pm) + callback = dev->class->pm->runtime_resume; + else + callback = NULL; + retval = rpm_callback(callback, dev); if (retval) { __update_runtime_status(dev, RPM_SUSPENDED); pm_runtime_cancel_pending(dev); } else { + no_callback: __update_runtime_status(dev, RPM_ACTIVE); if (parent) atomic_inc(&parent->power.child_count); @@ -460,7 +581,7 @@ int __pm_runtime_resume(struct device *dev, bool from_wq) wake_up_all(&dev->power.wait_queue); if (!retval) - __pm_request_idle(dev); + rpm_idle(dev, RPM_ASYNC); out: if (parent) { @@ -471,28 +592,12 @@ int __pm_runtime_resume(struct device *dev, bool from_wq) spin_lock_irq(&dev->power.lock); } - dev_dbg(dev, "__pm_runtime_resume() returns %d!\n", retval); + dev_dbg(dev, "%s returns %d\n", __func__, retval); return retval; } /** - * pm_runtime_resume - Carry out run-time resume of given device. - * @dev: Device to suspend. - */ -int pm_runtime_resume(struct device *dev) -{ - int retval; - - spin_lock_irq(&dev->power.lock); - retval = __pm_runtime_resume(dev, false); - spin_unlock_irq(&dev->power.lock); - - return retval; -} -EXPORT_SYMBOL_GPL(pm_runtime_resume); - -/** * pm_runtime_work - Universal run-time PM work function. * @work: Work structure used for scheduling the execution of this function. * @@ -517,13 +622,16 @@ static void pm_runtime_work(struct work_struct *work) case RPM_REQ_NONE: break; case RPM_REQ_IDLE: - __pm_runtime_idle(dev); + rpm_idle(dev, RPM_NOWAIT); break; case RPM_REQ_SUSPEND: - __pm_runtime_suspend(dev, true); + rpm_suspend(dev, RPM_NOWAIT); + break; + case RPM_REQ_AUTOSUSPEND: + rpm_suspend(dev, RPM_NOWAIT | RPM_AUTO); break; case RPM_REQ_RESUME: - __pm_runtime_resume(dev, true); + rpm_resume(dev, RPM_NOWAIT); break; } @@ -532,117 +640,10 @@ static void pm_runtime_work(struct work_struct *work) } /** - * __pm_request_idle - Submit an idle notification request for given device. - * @dev: Device to handle. - * - * Check if the device's run-time PM status is correct for suspending the device - * and queue up a request to run __pm_runtime_idle() for it. - * - * This function must be called under dev->power.lock with interrupts disabled. - */ -static int __pm_request_idle(struct device *dev) -{ - int retval = 0; - - if (dev->power.runtime_error) - retval = -EINVAL; - else if (atomic_read(&dev->power.usage_count) > 0 - || dev->power.disable_depth > 0 - || dev->power.runtime_status == RPM_SUSPENDED - || dev->power.runtime_status == RPM_SUSPENDING) - retval = -EAGAIN; - else if (!pm_children_suspended(dev)) - retval = -EBUSY; - if (retval) - return retval; - - if (dev->power.request_pending) { - /* Any requests other then RPM_REQ_IDLE take precedence. */ - if (dev->power.request == RPM_REQ_NONE) - dev->power.request = RPM_REQ_IDLE; - else if (dev->power.request != RPM_REQ_IDLE) - retval = -EAGAIN; - return retval; - } - - dev->power.request = RPM_REQ_IDLE; - dev->power.request_pending = true; - queue_work(pm_wq, &dev->power.work); - - return retval; -} - -/** - * pm_request_idle - Submit an idle notification request for given device. - * @dev: Device to handle. - */ -int pm_request_idle(struct device *dev) -{ - unsigned long flags; - int retval; - - spin_lock_irqsave(&dev->power.lock, flags); - retval = __pm_request_idle(dev); - spin_unlock_irqrestore(&dev->power.lock, flags); - - return retval; -} -EXPORT_SYMBOL_GPL(pm_request_idle); - -/** - * __pm_request_suspend - Submit a suspend request for given device. - * @dev: Device to suspend. - * - * This function must be called under dev->power.lock with interrupts disabled. - */ -static int __pm_request_suspend(struct device *dev) -{ - int retval = 0; - - if (dev->power.runtime_error) - return -EINVAL; - - if (dev->power.runtime_status == RPM_SUSPENDED) - retval = 1; - else if (atomic_read(&dev->power.usage_count) > 0 - || dev->power.disable_depth > 0) - retval = -EAGAIN; - else if (dev->power.runtime_status == RPM_SUSPENDING) - retval = -EINPROGRESS; - else if (!pm_children_suspended(dev)) - retval = -EBUSY; - if (retval < 0) - return retval; - - pm_runtime_deactivate_timer(dev); - - if (dev->power.request_pending) { - /* - * Pending resume requests take precedence over us, but we can - * overtake any other pending request. - */ - if (dev->power.request == RPM_REQ_RESUME) - retval = -EAGAIN; - else if (dev->power.request != RPM_REQ_SUSPEND) - dev->power.request = retval ? - RPM_REQ_NONE : RPM_REQ_SUSPEND; - return retval; - } else if (retval) { - return retval; - } - - dev->power.request = RPM_REQ_SUSPEND; - dev->power.request_pending = true; - queue_work(pm_wq, &dev->power.work); - - return 0; -} - -/** * pm_suspend_timer_fn - Timer function for pm_schedule_suspend(). * @data: Device pointer passed by pm_schedule_suspend(). * - * Check if the time is right and execute __pm_request_suspend() in that case. + * Check if the time is right and queue a suspend request. */ static void pm_suspend_timer_fn(unsigned long data) { @@ -656,7 +657,8 @@ static void pm_suspend_timer_fn(unsigned long data) /* If 'expire' is after 'jiffies' we've been called too early. */ if (expires > 0 && !time_after(expires, jiffies)) { dev->power.timer_expires = 0; - __pm_request_suspend(dev); + rpm_suspend(dev, dev->power.timer_autosuspends ? + (RPM_ASYNC | RPM_AUTO) : RPM_ASYNC); } spin_unlock_irqrestore(&dev->power.lock, flags); @@ -670,47 +672,25 @@ static void pm_suspend_timer_fn(unsigned long data) int pm_schedule_suspend(struct device *dev, unsigned int delay) { unsigned long flags; - int retval = 0; + int retval; spin_lock_irqsave(&dev->power.lock, flags); - if (dev->power.runtime_error) { - retval = -EINVAL; - goto out; - } - if (!delay) { - retval = __pm_request_suspend(dev); + retval = rpm_suspend(dev, RPM_ASYNC); goto out; } - pm_runtime_deactivate_timer(dev); - - if (dev->power.request_pending) { - /* - * Pending resume requests take precedence over us, but any - * other pending requests have to be canceled. - */ - if (dev->power.request == RPM_REQ_RESUME) { - retval = -EAGAIN; - goto out; - } - dev->power.request = RPM_REQ_NONE; - } - - if (dev->power.runtime_status == RPM_SUSPENDED) - retval = 1; - else if (atomic_read(&dev->power.usage_count) > 0 - || dev->power.disable_depth > 0) - retval = -EAGAIN; - else if (!pm_children_suspended(dev)) - retval = -EBUSY; + retval = rpm_check_suspend_allowed(dev); if (retval) goto out; + /* Other scheduled or pending requests need to be canceled. */ + pm_runtime_cancel_pending(dev); + dev->power.timer_expires = jiffies + msecs_to_jiffies(delay); - if (!dev->power.timer_expires) - dev->power.timer_expires = 1; + dev->power.timer_expires += !dev->power.timer_expires; + dev->power.timer_autosuspends = 0; mod_timer(&dev->power.suspend_timer, dev->power.timer_expires); out: @@ -721,103 +701,88 @@ int pm_schedule_suspend(struct device *dev, unsigned int delay) EXPORT_SYMBOL_GPL(pm_schedule_suspend); /** - * pm_request_resume - Submit a resume request for given device. - * @dev: Device to resume. + * __pm_runtime_idle - Entry point for run-time idle operations. + * @dev: Device to send idle notification for. + * @rpmflags: Flag bits. * - * This function must be called under dev->power.lock with interrupts disabled. + * If the RPM_GET_PUT flag is set, decrement the device's usage count and + * return immediately if it is larger than zero. Then carry out an idle + * notification, either synchronous or asynchronous. + * + * This routine may be called in atomic context if the RPM_ASYNC flag is set. */ -static int __pm_request_resume(struct device *dev) +int __pm_runtime_idle(struct device *dev, int rpmflags) { - int retval = 0; - - if (dev->power.runtime_error) - return -EINVAL; - - if (dev->power.runtime_status == RPM_ACTIVE) - retval = 1; - else if (dev->power.runtime_status == RPM_RESUMING) - retval = -EINPROGRESS; - else if (dev->power.disable_depth > 0) - retval = -EAGAIN; - if (retval < 0) - return retval; - - pm_runtime_deactivate_timer(dev); + unsigned long flags; + int retval; - if (dev->power.runtime_status == RPM_SUSPENDING) { - dev->power.deferred_resume = true; - return retval; + if (rpmflags & RPM_GET_PUT) { + if (!atomic_dec_and_test(&dev->power.usage_count)) + return 0; } - if (dev->power.request_pending) { - /* If non-resume request is pending, we can overtake it. */ - dev->power.request = retval ? RPM_REQ_NONE : RPM_REQ_RESUME; - return retval; - } - if (retval) - return retval; - dev->power.request = RPM_REQ_RESUME; - dev->power.request_pending = true; - queue_work(pm_wq, &dev->power.work); + spin_lock_irqsave(&dev->power.lock, flags); + retval = rpm_idle(dev, rpmflags); + spin_unlock_irqrestore(&dev->power.lock, flags); return retval; } +EXPORT_SYMBOL_GPL(__pm_runtime_idle); /** - * pm_request_resume - Submit a resume request for given device. - * @dev: Device to resume. + * __pm_runtime_suspend - Entry point for run-time put/suspend operations. + * @dev: Device to suspend. + * @rpmflags: Flag bits. + * + * If the RPM_GET_PUT flag is set, decrement the device's usage count and + * return immediately if it is larger than zero. Then carry out a suspend, + * either synchronous or asynchronous. + * + * This routine may be called in atomic context if the RPM_ASYNC flag is set. */ -int pm_request_resume(struct device *dev) +int __pm_runtime_suspend(struct device *dev, int rpmflags) { unsigned long flags; int retval; + if (rpmflags & RPM_GET_PUT) { + if (!atomic_dec_and_test(&dev->power.usage_count)) + return 0; + } + spin_lock_irqsave(&dev->power.lock, flags); - retval = __pm_request_resume(dev); + retval = rpm_suspend(dev, rpmflags); spin_unlock_irqrestore(&dev->power.lock, flags); return retval; } -EXPORT_SYMBOL_GPL(pm_request_resume); +EXPORT_SYMBOL_GPL(__pm_runtime_suspend); /** - * __pm_runtime_get - Reference count a device and wake it up, if necessary. - * @dev: Device to handle. - * @sync: If set and the device is suspended, resume it synchronously. + * __pm_runtime_resume - Entry point for run-time resume operations. + * @dev: Device to resume. + * @rpmflags: Flag bits. + * + * If the RPM_GET_PUT flag is set, increment the device's usage count. Then + * carry out a resume, either synchronous or asynchronous. * - * Increment the usage count of the device and resume it or submit a resume - * request for it, depending on the value of @sync. + * This routine may be called in atomic context if the RPM_ASYNC flag is set. */ -int __pm_runtime_get(struct device *dev, bool sync) +int __pm_runtime_resume(struct device *dev, int rpmflags) { + unsigned long flags; int retval; - atomic_inc(&dev->power.usage_count); - retval = sync ? pm_runtime_resume(dev) : pm_request_resume(dev); + if (rpmflags & RPM_GET_PUT) + atomic_inc(&dev->power.usage_count); - return retval; -} -EXPORT_SYMBOL_GPL(__pm_runtime_get); - -/** - * __pm_runtime_put - Decrement the device's usage counter and notify its bus. - * @dev: Device to handle. - * @sync: If the device's bus type is to be notified, do that synchronously. - * - * Decrement the usage count of the device and if it reaches zero, carry out a - * synchronous idle notification or submit an idle notification request for it, - * depending on the value of @sync. - */ -int __pm_runtime_put(struct device *dev, bool sync) -{ - int retval = 0; - - if (atomic_dec_and_test(&dev->power.usage_count)) - retval = sync ? pm_runtime_idle(dev) : pm_request_idle(dev); + spin_lock_irqsave(&dev->power.lock, flags); + retval = rpm_resume(dev, rpmflags); + spin_unlock_irqrestore(&dev->power.lock, flags); return retval; } -EXPORT_SYMBOL_GPL(__pm_runtime_put); +EXPORT_SYMBOL_GPL(__pm_runtime_resume); /** * __pm_runtime_set_status - Set run-time PM status of a device. @@ -968,7 +933,7 @@ int pm_runtime_barrier(struct device *dev) if (dev->power.request_pending && dev->power.request == RPM_REQ_RESUME) { - __pm_runtime_resume(dev, false); + rpm_resume(dev, 0); retval = 1; } @@ -1017,7 +982,7 @@ void __pm_runtime_disable(struct device *dev, bool check_resume) */ pm_runtime_get_noresume(dev); - __pm_runtime_resume(dev, false); + rpm_resume(dev, 0); pm_runtime_put_noidle(dev); } @@ -1065,7 +1030,7 @@ void pm_runtime_forbid(struct device *dev) dev->power.runtime_auto = false; atomic_inc(&dev->power.usage_count); - __pm_runtime_resume(dev, false); + rpm_resume(dev, 0); out: spin_unlock_irq(&dev->power.lock); @@ -1086,7 +1051,7 @@ void pm_runtime_allow(struct device *dev) dev->power.runtime_auto = true; if (atomic_dec_and_test(&dev->power.usage_count)) - __pm_runtime_idle(dev); + rpm_idle(dev, RPM_AUTO); out: spin_unlock_irq(&dev->power.lock); @@ -1094,13 +1059,110 @@ void pm_runtime_allow(struct device *dev) EXPORT_SYMBOL_GPL(pm_runtime_allow); /** + * pm_runtime_no_callbacks - Ignore run-time PM callbacks for a device. + * @dev: Device to handle. + * + * Set the power.no_callbacks flag, which tells the PM core that this + * device is power-managed through its parent and has no run-time PM + * callbacks of its own. The run-time sysfs attributes will be removed. + * + */ +void pm_runtime_no_callbacks(struct device *dev) +{ + spin_lock_irq(&dev->power.lock); + dev->power.no_callbacks = 1; + spin_unlock_irq(&dev->power.lock); + if (device_is_registered(dev)) + rpm_sysfs_remove(dev); +} +EXPORT_SYMBOL_GPL(pm_runtime_no_callbacks); + +/** + * update_autosuspend - Handle a change to a device's autosuspend settings. + * @dev: Device to handle. + * @old_delay: The former autosuspend_delay value. + * @old_use: The former use_autosuspend value. + * + * Prevent runtime suspend if the new delay is negative and use_autosuspend is + * set; otherwise allow it. Send an idle notification if suspends are allowed. + * + * This function must be called under dev->power.lock with interrupts disabled. + */ +static void update_autosuspend(struct device *dev, int old_delay, int old_use) +{ + int delay = dev->power.autosuspend_delay; + + /* Should runtime suspend be prevented now? */ + if (dev->power.use_autosuspend && delay < 0) { + + /* If it used to be allowed then prevent it. */ + if (!old_use || old_delay >= 0) { + atomic_inc(&dev->power.usage_count); + rpm_resume(dev, 0); + } + } + + /* Runtime suspend should be allowed now. */ + else { + + /* If it used to be prevented then allow it. */ + if (old_use && old_delay < 0) + atomic_dec(&dev->power.usage_count); + + /* Maybe we can autosuspend now. */ + rpm_idle(dev, RPM_AUTO); + } +} + +/** + * pm_runtime_set_autosuspend_delay - Set a device's autosuspend_delay value. + * @dev: Device to handle. + * @delay: Value of the new delay in milliseconds. + * + * Set the device's power.autosuspend_delay value. If it changes to negative + * and the power.use_autosuspend flag is set, prevent run-time suspends. If it + * changes the other way, allow run-time suspends. + */ +void pm_runtime_set_autosuspend_delay(struct device *dev, int delay) +{ + int old_delay, old_use; + + spin_lock_irq(&dev->power.lock); + old_delay = dev->power.autosuspend_delay; + old_use = dev->power.use_autosuspend; + dev->power.autosuspend_delay = delay; + update_autosuspend(dev, old_delay, old_use); + spin_unlock_irq(&dev->power.lock); +} +EXPORT_SYMBOL_GPL(pm_runtime_set_autosuspend_delay); + +/** + * __pm_runtime_use_autosuspend - Set a device's use_autosuspend flag. + * @dev: Device to handle. + * @use: New value for use_autosuspend. + * + * Set the device's power.use_autosuspend flag, and allow or prevent run-time + * suspends as needed. + */ +void __pm_runtime_use_autosuspend(struct device *dev, bool use) +{ + int old_delay, old_use; + + spin_lock_irq(&dev->power.lock); + old_delay = dev->power.autosuspend_delay; + old_use = dev->power.use_autosuspend; + dev->power.use_autosuspend = use; + update_autosuspend(dev, old_delay, old_use); + spin_unlock_irq(&dev->power.lock); +} +EXPORT_SYMBOL_GPL(__pm_runtime_use_autosuspend); + +/** * pm_runtime_init - Initialize run-time PM fields in given device object. * @dev: Device object to initialize. */ void pm_runtime_init(struct device *dev) { - spin_lock_init(&dev->power.lock); - dev->power.runtime_status = RPM_SUSPENDED; dev->power.idle_notification = false; |
