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PM / sleep: Asynchronous threads for suspend_noirq
In analogy with commits5af84b8270
and97df8c1299
, using asynchronous threads can improve the overall suspend_noirq time significantly. This patch is for suspend_noirq phase. Signed-off-by: Chuansheng Liu <chuansheng.liu@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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9e5e7910df
commit
28b6fd6e37
@ -990,14 +990,24 @@ static pm_message_t resume_event(pm_message_t sleep_state)
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* The driver of @dev will not receive interrupts while this function is being
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* executed.
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*/
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static int device_suspend_noirq(struct device *dev, pm_message_t state)
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static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async)
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{
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pm_callback_t callback = NULL;
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char *info = NULL;
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int error;
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int error = 0;
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if (async_error)
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goto Complete;
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if (pm_wakeup_pending()) {
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async_error = -EBUSY;
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goto Complete;
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}
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if (dev->power.syscore)
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return 0;
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goto Complete;
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dpm_wait_for_children(dev, async);
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if (dev->pm_domain) {
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info = "noirq power domain ";
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@ -1021,10 +1031,40 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state)
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error = dpm_run_callback(callback, dev, state, info);
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if (!error)
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dev->power.is_noirq_suspended = true;
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else
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async_error = error;
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Complete:
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complete_all(&dev->power.completion);
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return error;
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}
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static void async_suspend_noirq(void *data, async_cookie_t cookie)
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{
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struct device *dev = (struct device *)data;
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int error;
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error = __device_suspend_noirq(dev, pm_transition, true);
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if (error) {
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dpm_save_failed_dev(dev_name(dev));
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pm_dev_err(dev, pm_transition, " async", error);
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}
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put_device(dev);
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}
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static int device_suspend_noirq(struct device *dev)
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{
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reinit_completion(&dev->power.completion);
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if (pm_async_enabled && dev->power.async_suspend) {
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get_device(dev);
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async_schedule(async_suspend_noirq, dev);
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return 0;
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}
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return __device_suspend_noirq(dev, pm_transition, false);
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}
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/**
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* dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices.
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* @state: PM transition of the system being carried out.
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@ -1040,19 +1080,20 @@ static int dpm_suspend_noirq(pm_message_t state)
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cpuidle_pause();
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suspend_device_irqs();
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mutex_lock(&dpm_list_mtx);
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pm_transition = state;
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async_error = 0;
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while (!list_empty(&dpm_late_early_list)) {
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struct device *dev = to_device(dpm_late_early_list.prev);
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get_device(dev);
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mutex_unlock(&dpm_list_mtx);
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error = device_suspend_noirq(dev, state);
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error = device_suspend_noirq(dev);
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mutex_lock(&dpm_list_mtx);
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if (error) {
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pm_dev_err(dev, state, " noirq", error);
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suspend_stats.failed_suspend_noirq++;
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dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ);
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dpm_save_failed_dev(dev_name(dev));
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put_device(dev);
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break;
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@ -1061,16 +1102,21 @@ static int dpm_suspend_noirq(pm_message_t state)
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list_move(&dev->power.entry, &dpm_noirq_list);
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put_device(dev);
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if (pm_wakeup_pending()) {
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error = -EBUSY;
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if (async_error)
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break;
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}
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}
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mutex_unlock(&dpm_list_mtx);
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if (error)
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async_synchronize_full();
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if (!error)
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error = async_error;
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if (error) {
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suspend_stats.failed_suspend_noirq++;
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dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ);
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dpm_resume_noirq(resume_event(state));
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else
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} else {
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dpm_show_time(starttime, state, "noirq");
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}
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return error;
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}
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