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PM / sleep: Report interrupt that caused system wakeup

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Add a sysfs attribute, /sys/power/pm_wakeup_irq, reporting the IRQ
number of the first wakeup interrupt (that is, the first interrupt
from an IRQ line armed for system wakeup) seen by the kernel during
the most recent system suspend/resume cycle.

This feature will be useful for system wakeup diagnostics of
spurious wakeup interrupts.

Signed-off-by: Alexandra Yates <alexandra.yates@linux.intel.com>
[ rjw: Fixed up pm_wakeup_irq definition ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Alexandra Yates
2015-09-15 10:32:46 -07:00
committed by Rafael J. Wysocki
parent 6ff33f3902
commit a6f5f0dd4e
5 changed files with 45 additions and 1 deletions
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17
kernel/power/main.c
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@@ -272,6 +272,22 @@ static inline void pm_print_times_init(void)
{
pm_print_times_enabled = !!initcall_debug;
}
static ssize_t pm_wakeup_irq_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
{
return pm_wakeup_irq ? sprintf(buf, "%u\n", pm_wakeup_irq) : -ENODATA;
}
static ssize_t pm_wakeup_irq_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t n)
{
return -EINVAL;
}
power_attr(pm_wakeup_irq);
#else /* !CONFIG_PM_SLEEP_DEBUG */
static inline void pm_print_times_init(void) {}
#endif /* CONFIG_PM_SLEEP_DEBUG */
@@ -604,6 +620,7 @@ static struct attribute * g[] = {
#endif
#ifdef CONFIG_PM_SLEEP_DEBUG
&pm_print_times_attr.attr,
&pm_wakeup_irq_attr.attr,
#endif
#endif
#ifdef CONFIG_FREEZER