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PM / sleep: Asynchronous threads for suspend_late 

In analogy with commits 5af84b8270 and 97df8c1299, using
asynchronous threads can improve the overall suspend_late
time significantly.

This patch is for suspend_late phase.

Signed-off-by: Chuansheng Liu <chuansheng.liu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Liu, Chuansheng 2014-02-18 10:28:48 +08:00 committed by Rafael J. Wysocki
parent 28b6fd6e37
commit de377b3972
1 changed files with 54 additions and 12 deletions
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66
drivers/base/power/main.c
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@ -1127,16 +1127,26 @@ static int dpm_suspend_noirq(pm_message_t state)
*
* Runtime PM is disabled for @dev while this function is being executed.
*/
static int device_suspend_late(struct device *dev, pm_message_t state)
static int __device_suspend_late(struct device *dev, pm_message_t state, bool async)
{
pm_callback_t callback = NULL;
char *info = NULL;
int error;
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)
return 0;
goto Complete;
dpm_wait_for_children(dev, async);
if (dev->pm_domain) {
info = "late power domain ";
@ -1160,10 +1170,40 @@ static int device_suspend_late(struct device *dev, pm_message_t 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.
@ -1174,19 +1214,20 @@ static int dpm_suspend_late(pm_message_t state)
int error = 0;
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, state);
error = device_suspend_late(dev);
mutex_lock(&dpm_list_mtx);
if (error) {
pm_dev_err(dev, state, " late", error);
suspend_stats.failed_suspend_late++;
dpm_save_failed_step(SUSPEND_SUSPEND_LATE);
dpm_save_failed_dev(dev_name(dev));
put_device(dev);
break;
@ -1195,17 +1236,18 @@ static int dpm_suspend_late(pm_message_t state)
list_move(&dev->power.entry, &dpm_late_early_list);
put_device(dev);
if (pm_wakeup_pending()) {
error = -EBUSY;
if (async_error)
break;
}
}
mutex_unlock(&dpm_list_mtx);
if (error)
async_synchronize_full();
if (error) {
suspend_stats.failed_suspend_late++;
dpm_save_failed_step(SUSPEND_SUSPEND_LATE);
dpm_resume_early(resume_event(state));
else
} else {
dpm_show_time(starttime, state, "late");
}
return error;
}