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authorAlexandra Yates <alexandra.yates@linux.intel.com>2015-09-15 20:32:46 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-09-16 15:20:41 +0300
commita6f5f0dd4e21191ce35030dd4d6421e1cca10ee4 (patch)
treed11055309f1b697fe91aadaf327dace3412b31f1 /kernel/power/main.c
parent6ff33f3902c3b1c5d0db6b1e2c70b6d76fba357f (diff)
downloadlinux-a6f5f0dd4e21191ce35030dd4d6421e1cca10ee4.tar.xz
PM / sleep: Report interrupt that caused system wakeup
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>
Diffstat (limited to 'kernel/power/main.c')
-rw-r--r--kernel/power/main.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 63d395b5df93..b2dd4d999900 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -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