diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/power/main.c | 39 | ||||
| -rw-r--r-- | drivers/base/power/power.h | 4 |
2 files changed, 42 insertions, 1 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 06f09bf89cb2..f1e1a5b8fb04 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -179,6 +179,39 @@ static void initcall_debug_report(struct device *dev, ktime_t calltime, error, (unsigned long long)ktime_to_ns(delta) >> 10); } } +#ifdef CONFIG_SUSPEND_DEVICE_TIME_DEBUG +static void suspend_time_debug_start(ktime_t *start) +{ + *start = ktime_get(); +} + +static void suspend_time_debug_report(const char *name, struct device *dev, + ktime_t starttime) +{ + ktime_t rettime; + s64 usecs64; + int usecs; + + if (!dev->driver) + return; + + rettime = ktime_get(); + usecs64 = ktime_to_us(ktime_sub(rettime, starttime)); + usecs = usecs64; + if (usecs == 0) + usecs = 1; + + if (device_suspend_time_threshold + && usecs > device_suspend_time_threshold) + pr_info("PM: device %s:%s %s too slow, it takes \t %ld.%03ld msecs\n", + dev->bus->name, dev_name(dev), name, + usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); +} +#else +static void suspend_time_debug_start(ktime_t *start) {} +static void suspend_time_debug_report(const char *name, struct device *dev, + ktime_t starttime) {} +#endif /* CONFIG_SUSPEND_DEVICE_TIME_DEBUG */ /** * dpm_wait - Wait for a PM operation to complete. @@ -216,7 +249,7 @@ static int pm_op(struct device *dev, pm_message_t state) { int error = 0; - ktime_t calltime; + ktime_t calltime, starttime; calltime = initcall_debug_start(dev); @@ -224,13 +257,17 @@ static int pm_op(struct device *dev, #ifdef CONFIG_SUSPEND case PM_EVENT_SUSPEND: if (ops->suspend) { + suspend_time_debug_start(&starttime); error = ops->suspend(dev); + suspend_time_debug_report("suspend", dev, starttime); suspend_report_result(ops->suspend, error); } break; case PM_EVENT_RESUME: if (ops->resume) { + suspend_time_debug_start(&starttime); error = ops->resume(dev); + suspend_time_debug_report("resume", dev, starttime); suspend_report_result(ops->resume, error); } break; diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h index f2a25f18fde7..51b585a4e9d9 100644 --- a/drivers/base/power/power.h +++ b/drivers/base/power/power.h @@ -10,6 +10,10 @@ static inline void pm_runtime_remove(struct device *dev) {} #endif /* !CONFIG_PM_RUNTIME */ +#ifdef CONFIG_SUSPEND_DEVICE_TIME_DEBUG +extern int device_suspend_time_threshold; +#endif + #ifdef CONFIG_PM_SLEEP /* kernel/power/main.c */ |