#endif
struct timer_base {
- spinlock_t lock;
+ raw_spinlock_t lock;
struct timer_list *running_timer;
+#ifdef CONFIG_PREEMPT_RT_FULL
+ struct swait_queue_head wait_for_running_timer;
+#endif
unsigned long clk;
unsigned long next_expiry;
unsigned int cpu;
if (!(tf & TIMER_MIGRATING)) {
base = get_timer_base(tf);
- spin_lock_irqsave(&base->lock, *flags);
+ raw_spin_lock_irqsave(&base->lock, *flags);
if (timer->flags == tf)
return base;
- spin_unlock_irqrestore(&base->lock, *flags);
+ raw_spin_unlock_irqrestore(&base->lock, *flags);
}
cpu_relax();
}
/* See the comment in lock_timer_base() */
timer->flags |= TIMER_MIGRATING;
- spin_unlock(&base->lock);
+ raw_spin_unlock(&base->lock);
base = new_base;
- spin_lock(&base->lock);
+ raw_spin_lock(&base->lock);
WRITE_ONCE(timer->flags,
(timer->flags & ~TIMER_BASEMASK) | base->cpu);
}
}
out_unlock:
- spin_unlock_irqrestore(&base->lock, flags);
+ raw_spin_unlock_irqrestore(&base->lock, flags);
return ret;
}
if (base != new_base) {
timer->flags |= TIMER_MIGRATING;
- spin_unlock(&base->lock);
+ raw_spin_unlock(&base->lock);
base = new_base;
- spin_lock(&base->lock);
+ raw_spin_lock(&base->lock);
WRITE_ONCE(timer->flags,
(timer->flags & ~TIMER_BASEMASK) | cpu);
}
debug_activate(timer, timer->expires);
internal_add_timer(base, timer);
- spin_unlock_irqrestore(&base->lock, flags);
+ raw_spin_unlock_irqrestore(&base->lock, flags);
}
EXPORT_SYMBOL_GPL(add_timer_on);
+#ifdef CONFIG_PREEMPT_RT_FULL
+/*
+ * Wait for a running timer
+ */
+static void wait_for_running_timer(struct timer_list *timer)
+{
+ struct timer_base *base;
+ u32 tf = timer->flags;
+
+ if (tf & TIMER_MIGRATING)
+ return;
+
+ base = get_timer_base(tf);
+ swait_event(base->wait_for_running_timer,
+ base->running_timer != timer);
+}
+
+# define wakeup_timer_waiters(b) swake_up_all(&(b)->wait_for_running_timer)
+#else
+static inline void wait_for_running_timer(struct timer_list *timer)
+{
+ cpu_relax();
+}
+
+# define wakeup_timer_waiters(b) do { } while (0)
+#endif
+
/**
* del_timer - deactive a timer.
* @timer: the timer to be deactivated
if (timer_pending(timer)) {
base = lock_timer_base(timer, &flags);
ret = detach_if_pending(timer, base, true);
- spin_unlock_irqrestore(&base->lock, flags);
+ raw_spin_unlock_irqrestore(&base->lock, flags);
}
return ret;
timer_stats_timer_clear_start_info(timer);
ret = detach_if_pending(timer, base, true);
}
- spin_unlock_irqrestore(&base->lock, flags);
+ raw_spin_unlock_irqrestore(&base->lock, flags);
return ret;
}
EXPORT_SYMBOL(try_to_del_timer_sync);
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
/**
* del_timer_sync - deactivate a timer and wait for the handler to finish.
* @timer: the timer to be deactivated
int ret = try_to_del_timer_sync(timer);
if (ret >= 0)
return ret;
- cpu_relax();
+ wait_for_running_timer(timer);
}
}
EXPORT_SYMBOL(del_timer_sync);
fn = timer->function;
data = timer->data;
- if (timer->flags & TIMER_IRQSAFE) {
- spin_unlock(&base->lock);
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT_FULL) &&
+ timer->flags & TIMER_IRQSAFE) {
+ raw_spin_unlock(&base->lock);
call_timer_fn(timer, fn, data);
- spin_lock(&base->lock);
+ base->running_timer = NULL;
+ raw_spin_lock(&base->lock);
} else {
- spin_unlock_irq(&base->lock);
+ raw_spin_unlock_irq(&base->lock);
call_timer_fn(timer, fn, data);
- spin_lock_irq(&base->lock);
+ base->running_timer = NULL;
+ raw_spin_lock_irq(&base->lock);
}
}
}
if (cpu_is_offline(smp_processor_id()))
return expires;
- spin_lock(&base->lock);
+ raw_spin_lock(&base->lock);
nextevt = __next_timer_interrupt(base);
is_max_delta = (nextevt == base->clk + NEXT_TIMER_MAX_DELTA);
base->next_expiry = nextevt;
if ((expires - basem) > TICK_NSEC)
base->is_idle = true;
}
- spin_unlock(&base->lock);
+ raw_spin_unlock(&base->lock);
return cmp_next_hrtimer_event(basem, expires);
}
/* Note: this timer irq context must be accounted for as well. */
account_process_tick(p, user_tick);
+ scheduler_tick();
run_local_timers();
rcu_check_callbacks(user_tick);
-#ifdef CONFIG_IRQ_WORK
+#if defined(CONFIG_IRQ_WORK)
if (in_irq())
irq_work_tick();
#endif
- scheduler_tick();
run_posix_cpu_timers(p);
}
if (!time_after_eq(jiffies, base->clk))
return;
- spin_lock_irq(&base->lock);
+ raw_spin_lock_irq(&base->lock);
while (time_after_eq(jiffies, base->clk)) {
while (levels--)
expire_timers(base, heads + levels);
}
- base->running_timer = NULL;
- spin_unlock_irq(&base->lock);
+ raw_spin_unlock_irq(&base->lock);
+ wakeup_timer_waiters(base);
}
/*
{
struct timer_base *base = this_cpu_ptr(&timer_bases[BASE_STD]);
+ irq_work_tick_soft();
+
__run_timers(base);
if (IS_ENABLED(CONFIG_NO_HZ_COMMON) && base->nohz_active)
__run_timers(this_cpu_ptr(&timer_bases[BASE_DEF]));
* The caller is globally serialized and nobody else
* takes two locks at once, deadlock is not possible.
*/
- spin_lock_irq(&new_base->lock);
- spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);
+ raw_spin_lock_irq(&new_base->lock);
+ raw_spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);
BUG_ON(old_base->running_timer);
for (i = 0; i < WHEEL_SIZE; i++)
migrate_timer_list(new_base, old_base->vectors + i);
- spin_unlock(&old_base->lock);
- spin_unlock_irq(&new_base->lock);
+ raw_spin_unlock(&old_base->lock);
+ raw_spin_unlock_irq(&new_base->lock);
put_cpu_ptr(&timer_bases);
}
return 0;
for (i = 0; i < NR_BASES; i++) {
base = per_cpu_ptr(&timer_bases[i], cpu);
base->cpu = cpu;
- spin_lock_init(&base->lock);
+ raw_spin_lock_init(&base->lock);
base->clk = jiffies;
+#ifdef CONFIG_PREEMPT_RT_FULL
+ init_swait_queue_head(&base->wait_for_running_timer);
+#endif
}
}
projects / zynq / linux.git / blobdiff