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Diffstat (limited to 'kernel/time/alarmtimer.c')
-rw-r--r--kernel/time/alarmtimer.c82
1 files changed, 59 insertions, 23 deletions
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 12dd190634ab..e6dc9a538efa 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -26,6 +26,9 @@
#include <linux/workqueue.h>
#include <linux/freezer.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/alarmtimer.h>
+
/**
* struct alarm_base - Alarm timer bases
* @lock: Lock for syncrhonized access to the base
@@ -40,7 +43,9 @@ static struct alarm_base {
clockid_t base_clockid;
} alarm_bases[ALARM_NUMTYPE];
-/* freezer delta & lock used to handle clock_nanosleep triggered wakeups */
+/* freezer information to handle clock_nanosleep triggered wakeups */
+static enum alarmtimer_type freezer_alarmtype;
+static ktime_t freezer_expires;
static ktime_t freezer_delta;
static DEFINE_SPINLOCK(freezer_delta_lock);
@@ -194,6 +199,7 @@ static enum hrtimer_restart alarmtimer_fired(struct hrtimer *timer)
}
spin_unlock_irqrestore(&base->lock, flags);
+ trace_alarmtimer_fired(alarm, base->gettime());
return ret;
}
@@ -218,16 +224,17 @@ EXPORT_SYMBOL_GPL(alarm_expires_remaining);
*/
static int alarmtimer_suspend(struct device *dev)
{
- struct rtc_time tm;
- ktime_t min, now;
- unsigned long flags;
+ ktime_t min, now, expires;
+ int i, ret, type;
struct rtc_device *rtc;
- int i;
- int ret;
+ unsigned long flags;
+ struct rtc_time tm;
spin_lock_irqsave(&freezer_delta_lock, flags);
min = freezer_delta;
- freezer_delta = ktime_set(0, 0);
+ expires = freezer_expires;
+ type = freezer_alarmtype;
+ freezer_delta = 0;
spin_unlock_irqrestore(&freezer_delta_lock, flags);
rtc = alarmtimer_get_rtcdev();
@@ -247,10 +254,13 @@ static int alarmtimer_suspend(struct device *dev)
if (!next)
continue;
delta = ktime_sub(next->expires, base->gettime());
- if (!min.tv64 || (delta.tv64 < min.tv64))
+ if (!min || (delta < min)) {
+ expires = next->expires;
min = delta;
+ type = i;
+ }
}
- if (min.tv64 == 0)
+ if (min == 0)
return 0;
if (ktime_to_ns(min) < 2 * NSEC_PER_SEC) {
@@ -258,6 +268,8 @@ static int alarmtimer_suspend(struct device *dev)
return -EBUSY;
}
+ trace_alarmtimer_suspend(expires, type);
+
/* Setup an rtc timer to fire that far in the future */
rtc_timer_cancel(rtc, &rtctimer);
rtc_read_time(rtc, &tm);
@@ -265,7 +277,7 @@ static int alarmtimer_suspend(struct device *dev)
now = ktime_add(now, min);
/* Set alarm, if in the past reject suspend briefly to handle */
- ret = rtc_timer_start(rtc, &rtctimer, now, ktime_set(0, 0));
+ ret = rtc_timer_start(rtc, &rtctimer, now, 0);
if (ret < 0)
__pm_wakeup_event(ws, MSEC_PER_SEC);
return ret;
@@ -295,15 +307,32 @@ static int alarmtimer_resume(struct device *dev)
static void alarmtimer_freezerset(ktime_t absexp, enum alarmtimer_type type)
{
- ktime_t delta;
+ struct alarm_base *base;
unsigned long flags;
- struct alarm_base *base = &alarm_bases[type];
+ ktime_t delta;
+
+ switch(type) {
+ case ALARM_REALTIME:
+ base = &alarm_bases[ALARM_REALTIME];
+ type = ALARM_REALTIME_FREEZER;
+ break;
+ case ALARM_BOOTTIME:
+ base = &alarm_bases[ALARM_BOOTTIME];
+ type = ALARM_BOOTTIME_FREEZER;
+ break;
+ default:
+ WARN_ONCE(1, "Invalid alarm type: %d\n", type);
+ return;
+ }
delta = ktime_sub(absexp, base->gettime());
spin_lock_irqsave(&freezer_delta_lock, flags);
- if (!freezer_delta.tv64 || (delta.tv64 < freezer_delta.tv64))
+ if (!freezer_delta || (delta < freezer_delta)) {
freezer_delta = delta;
+ freezer_expires = absexp;
+ freezer_alarmtype = type;
+ }
spin_unlock_irqrestore(&freezer_delta_lock, flags);
}
@@ -342,6 +371,8 @@ void alarm_start(struct alarm *alarm, ktime_t start)
alarmtimer_enqueue(base, alarm);
hrtimer_start(&alarm->timer, alarm->node.expires, HRTIMER_MODE_ABS);
spin_unlock_irqrestore(&base->lock, flags);
+
+ trace_alarmtimer_start(alarm, base->gettime());
}
EXPORT_SYMBOL_GPL(alarm_start);
@@ -390,6 +421,8 @@ int alarm_try_to_cancel(struct alarm *alarm)
if (ret >= 0)
alarmtimer_dequeue(base, alarm);
spin_unlock_irqrestore(&base->lock, flags);
+
+ trace_alarmtimer_cancel(alarm, base->gettime());
return ret;
}
EXPORT_SYMBOL_GPL(alarm_try_to_cancel);
@@ -420,10 +453,10 @@ u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval)
delta = ktime_sub(now, alarm->node.expires);
- if (delta.tv64 < 0)
+ if (delta < 0)
return 0;
- if (unlikely(delta.tv64 >= interval.tv64)) {
+ if (unlikely(delta >= interval)) {
s64 incr = ktime_to_ns(interval);
overrun = ktime_divns(delta, incr);
@@ -431,7 +464,7 @@ u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval)
alarm->node.expires = ktime_add_ns(alarm->node.expires,
incr*overrun);
- if (alarm->node.expires.tv64 > now.tv64)
+ if (alarm->node.expires > now)
return overrun;
/*
* This (and the ktime_add() below) is the
@@ -483,12 +516,13 @@ static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm,
spin_lock_irqsave(&ptr->it_lock, flags);
if ((ptr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) {
- if (posix_timer_event(ptr, 0) != 0)
+ if (IS_ENABLED(CONFIG_POSIX_TIMERS) &&
+ posix_timer_event(ptr, 0) != 0)
ptr->it_overrun++;
}
/* Re-add periodic timers */
- if (ptr->it.alarm.interval.tv64) {
+ if (ptr->it.alarm.interval) {
ptr->it_overrun += alarm_forward(alarm, now,
ptr->it.alarm.interval);
result = ALARMTIMER_RESTART;
@@ -696,7 +730,7 @@ static int update_rmtp(ktime_t exp, enum alarmtimer_type type,
rem = ktime_sub(exp, alarm_bases[type].gettime());
- if (rem.tv64 <= 0)
+ if (rem <= 0)
return 0;
rmt = ktime_to_timespec(rem);
@@ -721,7 +755,7 @@ static long __sched alarm_timer_nsleep_restart(struct restart_block *restart)
struct alarm alarm;
int ret = 0;
- exp.tv64 = restart->nanosleep.expires;
+ exp = restart->nanosleep.expires;
alarm_init(&alarm, type, alarmtimer_nsleep_wakeup);
if (alarmtimer_do_nsleep(&alarm, exp))
@@ -801,7 +835,7 @@ static int alarm_timer_nsleep(const clockid_t which_clock, int flags,
restart = &current->restart_block;
restart->fn = alarm_timer_nsleep_restart;
restart->nanosleep.clockid = type;
- restart->nanosleep.expires = exp.tv64;
+ restart->nanosleep.expires = exp;
restart->nanosleep.rmtp = rmtp;
ret = -ERESTART_RESTARTBLOCK;
@@ -846,8 +880,10 @@ static int __init alarmtimer_init(void)
alarmtimer_rtc_timer_init();
- posix_timers_register_clock(CLOCK_REALTIME_ALARM, &alarm_clock);
- posix_timers_register_clock(CLOCK_BOOTTIME_ALARM, &alarm_clock);
+ if (IS_ENABLED(CONFIG_POSIX_TIMERS)) {
+ posix_timers_register_clock(CLOCK_REALTIME_ALARM, &alarm_clock);
+ posix_timers_register_clock(CLOCK_BOOTTIME_ALARM, &alarm_clock);
+ }
/* Initialize alarm bases */
alarm_bases[ALARM_REALTIME].base_clockid = CLOCK_REALTIME;
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-18 06:14:54 +0000