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Subject[PATCH 3/5] PM: Enabling the asyncronous threads for resume_early
Date
From: "Liu, Chuansheng" <chuansheng.liu@intel.com>

Just like commit 5af84b82701a and 97df8c12995, using the
asynchronous threads can improve the overall resume_early
time significantly.

This patch is for resume_early phase.

Signed-off-by: Liu, Chuansheng <chuansheng.liu@intel.com>
---
drivers/base/power/main.c | 48 +++++++++++++++++++++++++++++++++++----------
1 file changed, 38 insertions(+), 10 deletions(-)

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index c8a00fc..1bad6bd 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -619,35 +619,63 @@ static int device_resume_early(struct device *dev, pm_message_t state)
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);
+ 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();

mutex_lock(&dpm_list_mtx);
- while (!list_empty(&dpm_late_early_list)) {
- struct device *dev = to_device(dpm_late_early_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_late_early_list, power.entry) {
+ 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);

- error = device_resume_early(dev, state);
- 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);
- }
+ if (!is_async(dev)) {
+ int error;

+ error = device_resume_early(dev, state);
+ 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");
}

--
1.7.9.5


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