From: "Liu, Chuansheng" <chuansheng....@intel.com> Just like commit 5af84b82701a and 97df8c12995, using the asynchronous threads can improve the overall suspend_late time significantly.
This patch is for suspend_late phase. Signed-off-by: Liu, Chuansheng <chuansheng....@intel.com> --- drivers/base/power/main.c | 54 +++++++++++++++++++++++++++++++++++++-------- 1 file changed, 45 insertions(+), 9 deletions(-) diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index ec946aa..19f5195 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -1094,7 +1094,7 @@ 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) { pm_callback_t callback = NULL; char *info = NULL; @@ -1102,6 +1102,14 @@ static int device_suspend_late(struct device *dev, pm_message_t state) __pm_runtime_disable(dev, false); + if (async_error) + return 0; + + if (pm_wakeup_pending()) { + async_error = -EBUSY; + return async_error; + } + if (dev->power.syscore) return 0; @@ -1127,9 +1135,35 @@ 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; 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); + 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) +{ + 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); +} + /** * dpm_suspend_late - Execute "late suspend" callbacks for all devices. * @state: PM transition of the system being carried out. @@ -1140,19 +1174,20 @@ 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; @@ -1161,15 +1196,16 @@ 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; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/