/**
* ktime_get_ts - get the monotonic clock in timespec format
+ *
* @ts: pointer to timespec variable
*
* The function calculates the monotonic clock from the realtime
}
EXPORT_SYMBOL_GPL(ktime_get_ts);
-/*
- * Get the coarse grained time at the softirq based on xtime and
- * wall_to_monotonic.
- */
-static void hrtimer_get_softirq_time(struct hrtimer_base *base)
-{
- ktime_t xtim, tomono;
- unsigned long seq;
-
- do {
- seq = read_seqbegin(&xtime_lock);
- xtim = timespec_to_ktime(xtime);
- tomono = timespec_to_ktime(wall_to_monotonic);
-
- } while (read_seqretry(&xtime_lock, seq));
-
- base[CLOCK_REALTIME].softirq_time = xtim;
- base[CLOCK_MONOTONIC].softirq_time = ktime_add(xtim, tomono);
-}
-
/*
* Functions and macros which are different for UP/SMP systems are kept in a
* single place
{
struct hrtimer_base *new_base;
- new_base = &__get_cpu_var(hrtimer_bases)[base->index];
+ new_base = &__get_cpu_var(hrtimer_bases[base->index]);
if (base != new_base) {
/*
# ifndef CONFIG_KTIME_SCALAR
/**
* ktime_add_ns - Add a scalar nanoseconds value to a ktime_t variable
+ *
* @kt: addend
* @nsec: the scalar nsec value to add
*
/*
* Divide a ktime value by a nanosecond value
*/
-static unsigned long ktime_divns(const ktime_t kt, s64 div)
+static unsigned long ktime_divns(const ktime_t kt, nsec_t div)
{
u64 dclc, inc, dns;
int sft = 0;
/**
* hrtimer_forward - forward the timer expiry
+ *
* @timer: hrtimer to forward
- * @now: forward past this time
* @interval: the interval to forward
*
* Forward the timer expiry so it will expire in the future.
* Returns the number of overruns.
*/
unsigned long
-hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval)
+hrtimer_forward(struct hrtimer *timer, ktime_t interval)
{
unsigned long orun = 1;
- ktime_t delta;
+ ktime_t delta, now;
+
+ now = timer->base->get_time();
delta = ktime_sub(now, timer->expires);
interval.tv64 = timer->base->resolution.tv64;
if (unlikely(delta.tv64 >= interval.tv64)) {
- s64 incr = ktime_to_ns(interval);
+ nsec_t incr = ktime_to_ns(interval);
orun = ktime_divns(delta, incr);
timer->expires = ktime_add_ns(timer->expires, incr * orun);
rb_link_node(&timer->node, parent, link);
rb_insert_color(&timer->node, &base->active);
+ timer->state = HRTIMER_PENDING;
+
if (!base->first || timer->expires.tv64 <
rb_entry(base->first, struct hrtimer, node)->expires.tv64)
base->first = &timer->node;
if (base->first == &timer->node)
base->first = rb_next(&timer->node);
rb_erase(&timer->node, &base->active);
- rb_set_parent(&timer->node, &timer->node);
}
/*
{
if (hrtimer_active(timer)) {
__remove_hrtimer(timer, base);
+ timer->state = HRTIMER_INACTIVE;
return 1;
}
return 0;
/**
* hrtimer_start - (re)start an relative timer on the current CPU
+ *
* @timer: the timer to be added
* @tim: expiry time
* @mode: expiry mode: absolute (HRTIMER_ABS) or relative (HRTIMER_REL)
return ret;
}
-EXPORT_SYMBOL_GPL(hrtimer_start);
/**
* hrtimer_try_to_cancel - try to deactivate a timer
+ *
* @timer: hrtimer to stop
*
* Returns:
* 0 when the timer was not active
* 1 when the timer was active
* -1 when the timer is currently excuting the callback function and
- * cannot be stopped
+ * can not be stopped
*/
int hrtimer_try_to_cancel(struct hrtimer *timer)
{
return ret;
}
-EXPORT_SYMBOL_GPL(hrtimer_try_to_cancel);
/**
* hrtimer_cancel - cancel a timer and wait for the handler to finish.
+ *
* @timer: the timer to be cancelled
*
* Returns:
if (ret >= 0)
return ret;
- cpu_relax();
}
}
-EXPORT_SYMBOL_GPL(hrtimer_cancel);
/**
* hrtimer_get_remaining - get remaining time for the timer
+ *
* @timer: the timer to read
*/
ktime_t hrtimer_get_remaining(const struct hrtimer *timer)
return rem;
}
-EXPORT_SYMBOL_GPL(hrtimer_get_remaining);
#ifdef CONFIG_NO_IDLE_HZ
/**
/**
* hrtimer_init - initialize a timer to the given clock
+ *
* @timer: the timer to be initialized
* @clock_id: the clock to be used
* @mode: timer mode abs/rel
memset(timer, 0, sizeof(struct hrtimer));
- bases = __raw_get_cpu_var(hrtimer_bases);
+ bases = per_cpu(hrtimer_bases, raw_smp_processor_id());
if (clock_id == CLOCK_REALTIME && mode != HRTIMER_ABS)
clock_id = CLOCK_MONOTONIC;
timer->base = &bases[clock_id];
- rb_set_parent(&timer->node, &timer->node);
}
-EXPORT_SYMBOL_GPL(hrtimer_init);
/**
* hrtimer_get_res - get the timer resolution for a clock
+ *
* @which_clock: which clock to query
* @tp: pointer to timespec variable to store the resolution
*
{
struct hrtimer_base *bases;
- bases = __raw_get_cpu_var(hrtimer_bases);
+ bases = per_cpu(hrtimer_bases, raw_smp_processor_id());
*tp = ktime_to_timespec(bases[which_clock].resolution);
return 0;
}
-EXPORT_SYMBOL_GPL(hrtimer_get_res);
/*
* Expire the per base hrtimer-queue:
*/
static inline void run_hrtimer_queue(struct hrtimer_base *base)
{
+ ktime_t now = base->get_time();
struct rb_node *node;
- if (!base->first)
- return;
-
- if (base->get_softirq_time)
- base->softirq_time = base->get_softirq_time();
-
spin_lock_irq(&base->lock);
while ((node = base->first)) {
struct hrtimer *timer;
- int (*fn)(struct hrtimer *);
+ int (*fn)(void *);
int restart;
+ void *data;
timer = rb_entry(node, struct hrtimer, node);
- if (base->softirq_time.tv64 <= timer->expires.tv64)
+ if (now.tv64 <= timer->expires.tv64)
break;
fn = timer->function;
+ data = timer->data;
set_curr_timer(base, timer);
+ timer->state = HRTIMER_RUNNING;
__remove_hrtimer(timer, base);
spin_unlock_irq(&base->lock);
- restart = fn(timer);
+ /*
+ * fn == NULL is special case for the simplest timer
+ * variant - wake up process and do not restart:
+ */
+ if (!fn) {
+ wake_up_process(data);
+ restart = HRTIMER_NORESTART;
+ } else
+ restart = fn(data);
spin_lock_irq(&base->lock);
- if (restart != HRTIMER_NORESTART) {
- BUG_ON(hrtimer_active(timer));
+ /* Another CPU has added back the timer */
+ if (timer->state != HRTIMER_RUNNING)
+ continue;
+
+ if (restart == HRTIMER_RESTART)
enqueue_hrtimer(timer, base);
- }
+ else
+ timer->state = HRTIMER_EXPIRED;
}
set_curr_timer(base, NULL);
spin_unlock_irq(&base->lock);
struct hrtimer_base *base = __get_cpu_var(hrtimer_bases);
int i;
- hrtimer_get_softirq_time(base);
-
for (i = 0; i < MAX_HRTIMER_BASES; i++)
run_hrtimer_queue(&base[i]);
}
/*
* Sleep related functions:
*/
-static int hrtimer_wakeup(struct hrtimer *timer)
+
+/**
+ * schedule_hrtimer - sleep until timeout
+ *
+ * @timer: hrtimer variable initialized with the correct clock base
+ * @mode: timeout value is abs/rel
+ *
+ * Make the current task sleep until @timeout is
+ * elapsed.
+ *
+ * You can set the task state as follows -
+ *
+ * %TASK_UNINTERRUPTIBLE - at least @timeout is guaranteed to
+ * pass before the routine returns. The routine will return 0
+ *
+ * %TASK_INTERRUPTIBLE - the routine may return early if a signal is
+ * delivered to the current task. In this case the remaining time
+ * will be returned
+ *
+ * The current task state is guaranteed to be TASK_RUNNING when this
+ * routine returns.
+ */
+static ktime_t __sched
+schedule_hrtimer(struct hrtimer *timer, const enum hrtimer_mode mode)
{
- struct hrtimer_sleeper *t =
- container_of(timer, struct hrtimer_sleeper, timer);
- struct task_struct *task = t->task;
+ /* fn stays NULL, meaning single-shot wakeup: */
+ timer->data = current;
- t->task = NULL;
- if (task)
- wake_up_process(task);
+ hrtimer_start(timer, timer->expires, mode);
- return HRTIMER_NORESTART;
-}
+ schedule();
+ hrtimer_cancel(timer);
-void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task)
-{
- sl->timer.function = hrtimer_wakeup;
- sl->task = task;
+ /* Return the remaining time: */
+ if (timer->state != HRTIMER_EXPIRED)
+ return ktime_sub(timer->expires, timer->base->get_time());
+ else
+ return (ktime_t) {.tv64 = 0 };
}
-static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode)
+static inline ktime_t __sched
+schedule_hrtimer_interruptible(struct hrtimer *timer,
+ const enum hrtimer_mode mode)
{
- hrtimer_init_sleeper(t, current);
-
- do {
- set_current_state(TASK_INTERRUPTIBLE);
- hrtimer_start(&t->timer, t->timer.expires, mode);
-
- schedule();
+ set_current_state(TASK_INTERRUPTIBLE);
- hrtimer_cancel(&t->timer);
- mode = HRTIMER_ABS;
-
- } while (t->task && !signal_pending(current));
-
- return t->task == NULL;
+ return schedule_hrtimer(timer, mode);
}
static long __sched nanosleep_restart(struct restart_block *restart)
{
- struct hrtimer_sleeper t;
struct timespec __user *rmtp;
struct timespec tu;
- ktime_t time;
+ void *rfn_save = restart->fn;
+ struct hrtimer timer;
+ ktime_t rem;
restart->fn = do_no_restart_syscall;
- hrtimer_init(&t.timer, restart->arg3, HRTIMER_ABS);
- t.timer.expires.tv64 = ((u64)restart->arg1 << 32) | (u64) restart->arg0;
+ hrtimer_init(&timer, (clockid_t) restart->arg3, HRTIMER_ABS);
+
+ timer.expires.tv64 = ((u64)restart->arg1 << 32) | (u64) restart->arg0;
- if (do_nanosleep(&t, HRTIMER_ABS))
+ rem = schedule_hrtimer_interruptible(&timer, HRTIMER_ABS);
+
+ if (rem.tv64 <= 0)
return 0;
rmtp = (struct timespec __user *) restart->arg2;
- if (rmtp) {
- time = ktime_sub(t.timer.expires, t.timer.base->get_time());
- if (time.tv64 <= 0)
- return 0;
- tu = ktime_to_timespec(time);
- if (copy_to_user(rmtp, &tu, sizeof(tu)))
- return -EFAULT;
- }
+ tu = ktime_to_timespec(rem);
+ if (rmtp && copy_to_user(rmtp, &tu, sizeof(tu)))
+ return -EFAULT;
- restart->fn = nanosleep_restart;
+ restart->fn = rfn_save;
/* The other values in restart are already filled in */
return -ERESTART_RESTARTBLOCK;
const enum hrtimer_mode mode, const clockid_t clockid)
{
struct restart_block *restart;
- struct hrtimer_sleeper t;
+ struct hrtimer timer;
struct timespec tu;
ktime_t rem;
- hrtimer_init(&t.timer, clockid, mode);
- t.timer.expires = timespec_to_ktime(*rqtp);
- if (do_nanosleep(&t, mode))
+ hrtimer_init(&timer, clockid, mode);
+
+ timer.expires = timespec_to_ktime(*rqtp);
+
+ rem = schedule_hrtimer_interruptible(&timer, mode);
+ if (rem.tv64 <= 0)
return 0;
/* Absolute timers do not update the rmtp value and restart: */
if (mode == HRTIMER_ABS)
return -ERESTARTNOHAND;
- if (rmtp) {
- rem = ktime_sub(t.timer.expires, t.timer.base->get_time());
- if (rem.tv64 <= 0)
- return 0;
- tu = ktime_to_timespec(rem);
- if (copy_to_user(rmtp, &tu, sizeof(tu)))
- return -EFAULT;
- }
+ tu = ktime_to_timespec(rem);
+
+ if (rmtp && copy_to_user(rmtp, &tu, sizeof(tu)))
+ return -EFAULT;
restart = ¤t_thread_info()->restart_block;
restart->fn = nanosleep_restart;
- restart->arg0 = t.timer.expires.tv64 & 0xFFFFFFFF;
- restart->arg1 = t.timer.expires.tv64 >> 32;
+ restart->arg0 = timer.expires.tv64 & 0xFFFFFFFF;
+ restart->arg1 = timer.expires.tv64 >> 32;
restart->arg2 = (unsigned long) rmtp;
- restart->arg3 = (unsigned long) t.timer.base->index;
+ restart->arg3 = (unsigned long) timer.base->index;
return -ERESTART_RESTARTBLOCK;
}
struct hrtimer_base *base = per_cpu(hrtimer_bases, cpu);
int i;
- for (i = 0; i < MAX_HRTIMER_BASES; i++, base++) {
+ for (i = 0; i < MAX_HRTIMER_BASES; i++, base++)
spin_lock_init(&base->lock);
- lockdep_set_class(&base->lock, &base->lock_key);
- }
}
#ifdef CONFIG_HOTPLUG_CPU
}
#endif /* CONFIG_HOTPLUG_CPU */
-static int __cpuinit hrtimer_cpu_notify(struct notifier_block *self,
+static int __devinit hrtimer_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
long cpu = (long)hcpu;
return NOTIFY_OK;
}
-static struct notifier_block __cpuinitdata hrtimers_nb = {
+static struct notifier_block __devinitdata hrtimers_nb = {
.notifier_call = hrtimer_cpu_notify,
};
git://git.onelab.eu / linux-2.6.git / blobdiff