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hrtimers: Prepare for cancel on clock was set timers

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Make clock_was_set() unconditional and rename hres_timers_resume to
hrtimers_resume. This is a preparatory patch for hrtimers which are
cancelled when clock realtime was set.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2011-05-02 16:48:57 +02:00
parent 942c3c5c32
commit b12a03ce48
3 changed files with 65 additions and 78 deletions
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16
include/linux/hrtimer.h
View File

@ -148,9 +148,7 @@ struct hrtimer_clock_base {
ktime_t resolution;
ktime_t (*get_time)(void);
ktime_t softirq_time;
#ifdef CONFIG_HIGH_RES_TIMERS
ktime_t offset;
#endif
};
enum hrtimer_base_type {
@ -256,8 +254,6 @@ static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer)
#ifdef CONFIG_HIGH_RES_TIMERS
struct clock_event_device;
extern void clock_was_set(void);
extern void hres_timers_resume(void);
extern void hrtimer_interrupt(struct clock_event_device *dev);
/*
@ -291,16 +287,8 @@ extern void hrtimer_peek_ahead_timers(void);
# define MONOTONIC_RES_NSEC LOW_RES_NSEC
# define KTIME_MONOTONIC_RES KTIME_LOW_RES
/*
* clock_was_set() is a NOP for non- high-resolution systems. The
* time-sorted order guarantees that a timer does not expire early and
* is expired in the next softirq when the clock was advanced.
*/
static inline void clock_was_set(void) { }
static inline void hrtimer_peek_ahead_timers(void) { }
static inline void hres_timers_resume(void) { }
/*
* In non high resolution mode the time reference is taken from
* the base softirq time variable.
@ -316,11 +304,13 @@ static inline int hrtimer_is_hres_active(struct hrtimer *timer)
}
#endif
extern void clock_was_set(void);
extern void hrtimers_resume(void);
extern ktime_t ktime_get(void);
extern ktime_t ktime_get_real(void);
extern ktime_t ktime_get_boottime(void);
DECLARE_PER_CPU(struct tick_device, tick_cpu_device);

125
kernel/hrtimer.c
View File

@ -621,66 +621,6 @@ static int hrtimer_reprogram(struct hrtimer *timer,
return res;
}
/*
* Retrigger next event is called after clock was set
*
* Called with interrupts disabled via on_each_cpu()
*/
static void retrigger_next_event(void *arg)
{
struct hrtimer_cpu_base *base;
struct timespec realtime_offset, wtm, sleep;
if (!hrtimer_hres_active())
return;
get_xtime_and_monotonic_and_sleep_offset(&realtime_offset, &wtm,
&sleep);
set_normalized_timespec(&realtime_offset, -wtm.tv_sec, -wtm.tv_nsec);
base = &__get_cpu_var(hrtimer_bases);
/* Adjust CLOCK_REALTIME offset */
raw_spin_lock(&base->lock);
base->clock_base[HRTIMER_BASE_REALTIME].offset =
timespec_to_ktime(realtime_offset);
base->clock_base[HRTIMER_BASE_BOOTTIME].offset =
timespec_to_ktime(sleep);
hrtimer_force_reprogram(base, 0);
raw_spin_unlock(&base->lock);
}
/*
* Clock realtime was set
*
* Change the offset of the realtime clock vs. the monotonic
* clock.
*
* We might have to reprogram the high resolution timer interrupt. On
* SMP we call the architecture specific code to retrigger _all_ high
* resolution timer interrupts. On UP we just disable interrupts and
* call the high resolution interrupt code.
*/
void clock_was_set(void)
{
/* Retrigger the CPU local events everywhere */
on_each_cpu(retrigger_next_event, NULL, 1);
}
/*
* During resume we might have to reprogram the high resolution timer
* interrupt (on the local CPU):
*/
void hres_timers_resume(void)
{
WARN_ONCE(!irqs_disabled(),
KERN_INFO "hres_timers_resume() called with IRQs enabled!");
retrigger_next_event(NULL);
}
/*
* Initialize the high resolution related parts of cpu_base
*/
@ -714,12 +654,14 @@ static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
return 0;
}
static void retrigger_next_event(void *arg);
/*
* Switch to high resolution mode
*/
static int hrtimer_switch_to_hres(void)
{
int cpu = smp_processor_id();
int i, cpu = smp_processor_id();
struct hrtimer_cpu_base *base = &per_cpu(hrtimer_bases, cpu);
unsigned long flags;
@ -735,9 +677,8 @@ static int hrtimer_switch_to_hres(void)
return 0;
}
base->hres_active = 1;
base->clock_base[HRTIMER_BASE_REALTIME].resolution = KTIME_HIGH_RES;
base->clock_base[HRTIMER_BASE_MONOTONIC].resolution = KTIME_HIGH_RES;
base->clock_base[HRTIMER_BASE_BOOTTIME].resolution = KTIME_HIGH_RES;
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++)
base->clock_base[i].resolution = KTIME_HIGH_RES;
tick_setup_sched_timer();
@ -764,6 +705,62 @@ static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { }
#endif /* CONFIG_HIGH_RES_TIMERS */
/*
* Retrigger next event is called after clock was set
*
* Called with interrupts disabled via on_each_cpu()
*/
static void retrigger_next_event(void *arg)
{
struct hrtimer_cpu_base *base = &__get_cpu_var(hrtimer_bases);
struct timespec realtime_offset, xtim, wtm, sleep;
if (!hrtimer_hres_active())
return;
get_xtime_and_monotonic_and_sleep_offset(&xtim, &wtm, &sleep);
set_normalized_timespec(&realtime_offset, -wtm.tv_sec, -wtm.tv_nsec);
/* Adjust CLOCK_REALTIME offset */
raw_spin_lock(&base->lock);
base->clock_base[HRTIMER_BASE_REALTIME].offset =
timespec_to_ktime(realtime_offset);
base->clock_base[HRTIMER_BASE_BOOTTIME].offset =
timespec_to_ktime(sleep);
hrtimer_force_reprogram(base, 0);
raw_spin_unlock(&base->lock);
}
/*
* Clock realtime was set
*
* Change the offset of the realtime clock vs. the monotonic
* clock.
*
* We might have to reprogram the high resolution timer interrupt. On
* SMP we call the architecture specific code to retrigger _all_ high
* resolution timer interrupts. On UP we just disable interrupts and
* call the high resolution interrupt code.
*/
void clock_was_set(void)
{
/* Retrigger the CPU local events everywhere */
on_each_cpu(retrigger_next_event, NULL, 1);
}
/*
* During resume we might have to reprogram the high resolution timer
* interrupt (on the local CPU):
*/
void hrtimers_resume(void)
{
WARN_ONCE(!irqs_disabled(),
KERN_INFO "hrtimers_resume() called with IRQs enabled!");
retrigger_next_event(NULL);
}
static inline void timer_stats_hrtimer_set_start_info(struct hrtimer *timer)
{
#ifdef CONFIG_TIMER_STATS

2
kernel/time/timekeeping.c
View File

@ -680,7 +680,7 @@ static void timekeeping_resume(void)
clockevents_notify(CLOCK_EVT_NOTIFY_RESUME, NULL);
/* Resume hrtimers */
hres_timers_resume();
hrtimers_resume();
}
static int timekeeping_suspend(void)