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PM: Add sysfs files to represent time spent in hardware sleep state

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Userspace can't easily discover how much of a sleep cycle was spent in a
hardware sleep state without using kernel tracing and vendor specific sysfs
or debugfs files.

To make this information more discoverable, introduce 3 new sysfs files:
1) The time spent in a hw sleep state for last cycle.
2) The time spent in a hw sleep state since the kernel booted
3) The maximum time that the hardware can report for a sleep cycle.
All of these files will be present only if the system supports s2idle.

Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mario Limonciello
2023-04-17 10:27:05 -05:00
committed by Rafael J. Wysocki
parent 6a8f57ae2e
commit b52124a78a
3 changed files with 84 additions and 12 deletions
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8
include/linux/suspend.h
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@@ -68,6 +68,9 @@ struct suspend_stats {
int last_failed_errno;
int errno[REC_FAILED_NUM];
int last_failed_step;
u64 last_hw_sleep;
u64 total_hw_sleep;
u64 max_hw_sleep;
enum suspend_stat_step failed_steps[REC_FAILED_NUM];
};
@@ -489,6 +492,8 @@ void restore_processor_state(void);
extern int register_pm_notifier(struct notifier_block *nb);
extern int unregister_pm_notifier(struct notifier_block *nb);
extern void ksys_sync_helper(void);
extern void pm_report_hw_sleep_time(u64 t);
extern void pm_report_max_hw_sleep(u64 t);
#define pm_notifier(fn, pri) { \
static struct notifier_block fn##_nb = \
@@ -526,6 +531,9 @@ static inline int unregister_pm_notifier(struct notifier_block *nb)
return 0;
}
static inline void pm_report_hw_sleep_time(u64 t) {};
static inline void pm_report_max_hw_sleep(u64 t) {};
static inline void ksys_sync_helper(void) {}
#define pm_notifier(fn, pri) do { (void)(fn); } while (0)