mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 11:37:05 +07:00
4a057549d6
Alarm timers are one of the mechanisms to wake up a system from suspend, but there exist no tracepoints to analyse which process/thread armed an alarmtimer. Add tracepoints for start/cancel/expire of individual alarm timers and one for tracing the suspend time decision when to resume the system. The following trace excerpt illustrates the new mechanism: Binder:3292_2-3304 [000] d..2 149.981123: alarmtimer_cancel: alarmtimer:ffffffc1319a7800 type:REALTIME expires:1325463120000000000 now:1325376810370370245 Binder:3292_2-3304 [000] d..2 149.981136: alarmtimer_start: alarmtimer:ffffffc1319a7800 type:REALTIME expires:1325376840000000000 now:1325376810370384591 Binder:3292_9-3953 [000] d..2 150.212991: alarmtimer_cancel: alarmtimer:ffffffc1319a5a00 type:BOOTTIME expires:179552000000 now:150154008122 Binder:3292_9-3953 [000] d..2 150.213006: alarmtimer_start: alarmtimer:ffffffc1319a5a00 type:BOOTTIME expires:179551000000 now:150154025622 system_server-3000 [002] ...1 162.701940: alarmtimer_suspend: alarmtimer type:REALTIME expires:1325376840000000000 The wakeup time which is selected at suspend time allows to map it back to the task arming the timer: Binder:3292_2. [ tglx: Store alarm timer expiry time instead of some useless RTC relative information, add proper type information for wakeups which are handled via the clock_nanosleep/freezer and massage the changelog. ] Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: John Stultz <john.stultz@linaro.org> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Richard Cochran <richardcochran@gmail.com> Link: http://lkml.kernel.org/r/1480372524-15181-5-git-send-email-john.stultz@linaro.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
#ifndef _LINUX_ALARMTIMER_H
|
|
#define _LINUX_ALARMTIMER_H
|
|
|
|
#include <linux/time.h>
|
|
#include <linux/hrtimer.h>
|
|
#include <linux/timerqueue.h>
|
|
#include <linux/rtc.h>
|
|
|
|
enum alarmtimer_type {
|
|
ALARM_REALTIME,
|
|
ALARM_BOOTTIME,
|
|
|
|
/* Supported types end here */
|
|
ALARM_NUMTYPE,
|
|
|
|
/* Used for tracing information. No usable types. */
|
|
ALARM_REALTIME_FREEZER,
|
|
ALARM_BOOTTIME_FREEZER,
|
|
};
|
|
|
|
enum alarmtimer_restart {
|
|
ALARMTIMER_NORESTART,
|
|
ALARMTIMER_RESTART,
|
|
};
|
|
|
|
|
|
#define ALARMTIMER_STATE_INACTIVE 0x00
|
|
#define ALARMTIMER_STATE_ENQUEUED 0x01
|
|
|
|
/**
|
|
* struct alarm - Alarm timer structure
|
|
* @node: timerqueue node for adding to the event list this value
|
|
* also includes the expiration time.
|
|
* @timer: hrtimer used to schedule events while running
|
|
* @function: Function pointer to be executed when the timer fires.
|
|
* @type: Alarm type (BOOTTIME/REALTIME).
|
|
* @state: Flag that represents if the alarm is set to fire or not.
|
|
* @data: Internal data value.
|
|
*/
|
|
struct alarm {
|
|
struct timerqueue_node node;
|
|
struct hrtimer timer;
|
|
enum alarmtimer_restart (*function)(struct alarm *, ktime_t now);
|
|
enum alarmtimer_type type;
|
|
int state;
|
|
void *data;
|
|
};
|
|
|
|
void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
|
|
enum alarmtimer_restart (*function)(struct alarm *, ktime_t));
|
|
void alarm_start(struct alarm *alarm, ktime_t start);
|
|
void alarm_start_relative(struct alarm *alarm, ktime_t start);
|
|
void alarm_restart(struct alarm *alarm);
|
|
int alarm_try_to_cancel(struct alarm *alarm);
|
|
int alarm_cancel(struct alarm *alarm);
|
|
|
|
u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval);
|
|
u64 alarm_forward_now(struct alarm *alarm, ktime_t interval);
|
|
ktime_t alarm_expires_remaining(const struct alarm *alarm);
|
|
|
|
/* Provide way to access the rtc device being used by alarmtimers */
|
|
struct rtc_device *alarmtimer_get_rtcdev(void);
|
|
|
|
#endif
|