diff options
Diffstat (limited to 'drivers/base/power/main.c')
| -rw-r--r-- | drivers/base/power/main.c | 178 |
1 files changed, 77 insertions, 101 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 31b526661ec4..83404973f97a 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -8,7 +8,7 @@ * * * The driver model core calls device_pm_add() when a device is registered. - * This will intialize the embedded device_pm_info object in the device + * This will initialize the embedded device_pm_info object in the device * and add it to the list of power-controlled devices. sysfs entries for * controlling device power management will also be added. * @@ -26,6 +26,7 @@ #include <linux/interrupt.h> #include <linux/sched.h> #include <linux/async.h> +#include <linux/suspend.h> #include "../base.h" #include "power.h" @@ -41,16 +42,13 @@ */ LIST_HEAD(dpm_list); +LIST_HEAD(dpm_prepared_list); +LIST_HEAD(dpm_suspended_list); +LIST_HEAD(dpm_noirq_list); static DEFINE_MUTEX(dpm_list_mtx); static pm_message_t pm_transition; -/* - * Set once the preparation of devices for a PM transition has started, reset - * before starting to resume devices. Protected by dpm_list_mtx. - */ -static bool transition_started; - static int async_error; /** @@ -59,7 +57,7 @@ static int async_error; */ void device_pm_init(struct device *dev) { - dev->power.status = DPM_ON; + dev->power.in_suspend = false; init_completion(&dev->power.completion); complete_all(&dev->power.completion); dev->power.wakeup = NULL; @@ -90,22 +88,11 @@ void device_pm_unlock(void) void device_pm_add(struct device *dev) { pr_debug("PM: Adding info for %s:%s\n", - dev->bus ? dev->bus->name : "No Bus", - kobject_name(&dev->kobj)); + dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); mutex_lock(&dpm_list_mtx); - if (dev->parent) { - if (dev->parent->power.status >= DPM_SUSPENDING) - dev_warn(dev, "parent %s should not be sleeping\n", - dev_name(dev->parent)); - } else if (transition_started) { - /* - * We refuse to register parentless devices while a PM - * transition is in progress in order to avoid leaving them - * unhandled down the road - */ - dev_WARN(dev, "Parentless device registered during a PM transaction\n"); - } - + if (dev->parent && dev->parent->power.in_suspend) + dev_warn(dev, "parent %s should not be sleeping\n", + dev_name(dev->parent)); list_add_tail(&dev->power.entry, &dpm_list); mutex_unlock(&dpm_list_mtx); } @@ -117,8 +104,7 @@ void device_pm_add(struct device *dev) void device_pm_remove(struct device *dev) { pr_debug("PM: Removing info for %s:%s\n", - dev->bus ? dev->bus->name : "No Bus", - kobject_name(&dev->kobj)); + dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); complete_all(&dev->power.completion); mutex_lock(&dpm_list_mtx); list_del_init(&dev->power.entry); @@ -135,10 +121,8 @@ void device_pm_remove(struct device *dev) void device_pm_move_before(struct device *deva, struct device *devb) { pr_debug("PM: Moving %s:%s before %s:%s\n", - deva->bus ? deva->bus->name : "No Bus", - kobject_name(&deva->kobj), - devb->bus ? devb->bus->name : "No Bus", - kobject_name(&devb->kobj)); + deva->bus ? deva->bus->name : "No Bus", dev_name(deva), + devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); /* Delete deva from dpm_list and reinsert before devb. */ list_move_tail(&deva->power.entry, &devb->power.entry); } @@ -151,10 +135,8 @@ void device_pm_move_before(struct device *deva, struct device *devb) void device_pm_move_after(struct device *deva, struct device *devb) { pr_debug("PM: Moving %s:%s after %s:%s\n", - deva->bus ? deva->bus->name : "No Bus", - kobject_name(&deva->kobj), - devb->bus ? devb->bus->name : "No Bus", - kobject_name(&devb->kobj)); + deva->bus ? deva->bus->name : "No Bus", dev_name(deva), + devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); /* Delete deva from dpm_list and reinsert after devb. */ list_move(&deva->power.entry, &devb->power.entry); } @@ -166,8 +148,7 @@ void device_pm_move_after(struct device *deva, struct device *devb) void device_pm_move_last(struct device *dev) { pr_debug("PM: Moving %s:%s to end of list\n", - dev->bus ? dev->bus->name : "No Bus", - kobject_name(&dev->kobj)); + dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); list_move_tail(&dev->power.entry, &dpm_list); } @@ -303,7 +284,7 @@ static int pm_noirq_op(struct device *dev, pm_message_t state) { int error = 0; - ktime_t calltime, delta, rettime; + ktime_t calltime = ktime_set(0, 0), delta, rettime; if (initcall_debug) { pr_info("calling %s+ @ %i, parent: %s\n", @@ -405,7 +386,7 @@ static void pm_dev_err(struct device *dev, pm_message_t state, char *info, int error) { printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", - kobject_name(&dev->kobj), pm_verb(state.event), info, error); + dev_name(dev), pm_verb(state.event), info, error); } static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) @@ -475,20 +456,24 @@ End: */ void dpm_resume_noirq(pm_message_t state) { - struct device *dev; ktime_t starttime = ktime_get(); mutex_lock(&dpm_list_mtx); - transition_started = false; - list_for_each_entry(dev, &dpm_list, power.entry) - if (dev->power.status > DPM_OFF) { - int error; + while (!list_empty(&dpm_noirq_list)) { + struct device *dev = to_device(dpm_noirq_list.next); + int error; - dev->power.status = DPM_OFF; - error = device_resume_noirq(dev, state); - if (error) - pm_dev_err(dev, state, " early", error); - } + get_device(dev); + list_move_tail(&dev->power.entry, &dpm_suspended_list); + mutex_unlock(&dpm_list_mtx); + + error = device_resume_noirq(dev, state); + if (error) + pm_dev_err(dev, state, " early", error); + + mutex_lock(&dpm_list_mtx); + put_device(dev); + } mutex_unlock(&dpm_list_mtx); dpm_show_time(starttime, state, "early"); resume_device_irqs(); @@ -531,7 +516,7 @@ static int device_resume(struct device *dev, pm_message_t state, bool async) dpm_wait(dev->parent, async); device_lock(dev); - dev->power.status = DPM_RESUMING; + dev->power.in_suspend = false; if (dev->bus) { if (dev->bus->pm) { @@ -597,19 +582,14 @@ static bool is_async(struct device *dev) */ static void dpm_resume(pm_message_t state) { - struct list_head list; struct device *dev; ktime_t starttime = ktime_get(); - INIT_LIST_HEAD(&list); mutex_lock(&dpm_list_mtx); pm_transition = state; async_error = 0; - list_for_each_entry(dev, &dpm_list, power.entry) { - if (dev->power.status < DPM_OFF) - continue; - + list_for_each_entry(dev, &dpm_suspended_list, power.entry) { INIT_COMPLETION(dev->power.completion); if (is_async(dev)) { get_device(dev); @@ -617,28 +597,24 @@ static void dpm_resume(pm_message_t state) } } - while (!list_empty(&dpm_list)) { - dev = to_device(dpm_list.next); + while (!list_empty(&dpm_suspended_list)) { + dev = to_device(dpm_suspended_list.next); get_device(dev); - if (dev->power.status >= DPM_OFF && !is_async(dev)) { + if (!is_async(dev)) { int error; mutex_unlock(&dpm_list_mtx); error = device_resume(dev, state, false); - - mutex_lock(&dpm_list_mtx); if (error) pm_dev_err(dev, state, "", error); - } else if (dev->power.status == DPM_SUSPENDING) { - /* Allow new children of the device to be registered */ - dev->power.status = DPM_RESUMING; + + mutex_lock(&dpm_list_mtx); } if (!list_empty(&dev->power.entry)) - list_move_tail(&dev->power.entry, &list); + list_move_tail(&dev->power.entry, &dpm_prepared_list); put_device(dev); } - list_splice(&list, &dpm_list); mutex_unlock(&dpm_list_mtx); async_synchronize_full(); dpm_show_time(starttime, state, NULL); @@ -684,22 +660,18 @@ static void dpm_complete(pm_message_t state) INIT_LIST_HEAD(&list); mutex_lock(&dpm_list_mtx); - transition_started = false; - while (!list_empty(&dpm_list)) { - struct device *dev = to_device(dpm_list.prev); + while (!list_empty(&dpm_prepared_list)) { + struct device *dev = to_device(dpm_prepared_list.prev); get_device(dev); - if (dev->power.status > DPM_ON) { - dev->power.status = DPM_ON; - mutex_unlock(&dpm_list_mtx); + dev->power.in_suspend = false; + list_move(&dev->power.entry, &list); + mutex_unlock(&dpm_list_mtx); - device_complete(dev, state); - pm_runtime_put_sync(dev); + device_complete(dev, state); + pm_runtime_put_sync(dev); - mutex_lock(&dpm_list_mtx); - } - if (!list_empty(&dev->power.entry)) - list_move(&dev->power.entry, &list); + mutex_lock(&dpm_list_mtx); put_device(dev); } list_splice(&list, &dpm_list); @@ -789,19 +761,28 @@ End: */ int dpm_suspend_noirq(pm_message_t state) { - struct device *dev; ktime_t starttime = ktime_get(); int error = 0; suspend_device_irqs(); mutex_lock(&dpm_list_mtx); - list_for_each_entry_reverse(dev, &dpm_list, power.entry) { + 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_noirq(dev, state); + + mutex_lock(&dpm_list_mtx); if (error) { pm_dev_err(dev, state, " late", error); + put_device(dev); break; } - dev->power.status = DPM_OFF_IRQ; + if (!list_empty(&dev->power.entry)) + list_move(&dev->power.entry, &dpm_noirq_list); + put_device(dev); } mutex_unlock(&dpm_list_mtx); if (error) @@ -850,6 +831,11 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async) if (async_error) goto End; + if (pm_wakeup_pending()) { + async_error = -EBUSY; + goto End; + } + if (dev->class) { if (dev->class->pm) { pm_dev_dbg(dev, state, "class "); @@ -881,9 +867,6 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async) } } - if (!error) - dev->power.status = DPM_OFF; - End: device_unlock(dev); complete_all(&dev->power.completion); @@ -925,16 +908,14 @@ static int device_suspend(struct device *dev) */ static int dpm_suspend(pm_message_t state) { - struct list_head list; ktime_t starttime = ktime_get(); int error = 0; - INIT_LIST_HEAD(&list); mutex_lock(&dpm_list_mtx); pm_transition = state; async_error = 0; - while (!list_empty(&dpm_list)) { - struct device *dev = to_device(dpm_list.prev); + while (!list_empty(&dpm_prepared_list)) { + struct device *dev = to_device(dpm_prepared_list.prev); get_device(dev); mutex_unlock(&dpm_list_mtx); @@ -948,12 +929,11 @@ static int dpm_suspend(pm_message_t state) break; } if (!list_empty(&dev->power.entry)) - list_move(&dev->power.entry, &list); + list_move(&dev->power.entry, &dpm_suspended_list); put_device(dev); if (async_error) break; } - list_splice(&list, dpm_list.prev); mutex_unlock(&dpm_list_mtx); async_synchronize_full(); if (!error) @@ -1012,22 +992,20 @@ static int device_prepare(struct device *dev, pm_message_t state) */ static int dpm_prepare(pm_message_t state) { - struct list_head list; int error = 0; - INIT_LIST_HEAD(&list); mutex_lock(&dpm_list_mtx); - transition_started = true; while (!list_empty(&dpm_list)) { struct device *dev = to_device(dpm_list.next); get_device(dev); - dev->power.status = DPM_PREPARING; mutex_unlock(&dpm_list_mtx); pm_runtime_get_noresume(dev); - if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) { - /* Wake-up requested during system sleep transition. */ + 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 { @@ -1036,24 +1014,22 @@ static int dpm_prepare(pm_message_t state) mutex_lock(&dpm_list_mtx); if (error) { - dev->power.status = DPM_ON; if (error == -EAGAIN) { put_device(dev); error = 0; continue; } - printk(KERN_ERR "PM: Failed to prepare device %s " - "for power transition: error %d\n", - kobject_name(&dev->kobj), error); + printk(KERN_INFO "PM: Device %s not prepared " + "for power transition: code %d\n", + dev_name(dev), error); put_device(dev); break; } - dev->power.status = DPM_SUSPENDING; + dev->power.in_suspend = true; if (!list_empty(&dev->power.entry)) - list_move_tail(&dev->power.entry, &list); + list_move_tail(&dev->power.entry, &dpm_prepared_list); put_device(dev); } - list_splice(&list, &dpm_list); mutex_unlock(&dpm_list_mtx); return error; } |