22 static void posix_cpu_timer_rearm(struct k_itimer *timer);
113 static inline struct task_struct *cpu_timer_task_rcu(struct k_itimer *timer)  in cpu_timer_task_rcu()  argument
115 	return pid_task(timer->it.cpu.pid, clock_pid_type(timer->it_clock));  in cpu_timer_task_rcu()
122 static u64 bump_cpu_timer(struct k_itimer *timer, u64 now)  in bump_cpu_timer()  argument
124 	u64 delta, incr, expires = timer->it.cpu.node.expires;  in bump_cpu_timer()
127 	if (!timer->it_interval)  in bump_cpu_timer()
133 	incr = timer->it_interval;  in bump_cpu_timer()
144 		timer->it.cpu.node.expires += incr;  in bump_cpu_timer()
145 		timer->it_overrun += 1LL << i;  in bump_cpu_timer()
148 	return timer->it.cpu.node.expires;  in bump_cpu_timer()
417 static struct posix_cputimer_base *timer_base(struct k_itimer *timer,  in timer_base()  argument
420 	int clkidx = CPUCLOCK_WHICH(timer->it_clock);  in timer_base()
422 	if (CPUCLOCK_PERTHREAD(timer->it_clock))  in timer_base()
434 static void trigger_base_recalc_expires(struct k_itimer *timer,  in trigger_base_recalc_expires()  argument
437 	struct posix_cputimer_base *base = timer_base(timer, tsk);  in trigger_base_recalc_expires()
452 static void disarm_timer(struct k_itimer *timer, struct task_struct *p)  in disarm_timer()  argument
454 	struct cpu_timer *ctmr = &timer->it.cpu;  in disarm_timer()
460 	base = timer_base(timer, p);  in disarm_timer()
462 		trigger_base_recalc_expires(timer, p);  in disarm_timer()
472 static int posix_cpu_timer_del(struct k_itimer *timer)  in posix_cpu_timer_del()  argument
474 	struct cpu_timer *ctmr = &timer->it.cpu;  in posix_cpu_timer_del()
481 	p = cpu_timer_task_rcu(timer);  in posix_cpu_timer_del()
497 		if (timer->it.cpu.firing)  in posix_cpu_timer_del()
500 			disarm_timer(timer, p);  in posix_cpu_timer_del()
557 static void arm_timer(struct k_itimer *timer, struct task_struct *p)  in arm_timer()  argument
559 	struct posix_cputimer_base *base = timer_base(timer, p);  in arm_timer()
560 	struct cpu_timer *ctmr = &timer->it.cpu;  in arm_timer()
575 	if (CPUCLOCK_PERTHREAD(timer->it_clock))  in arm_timer()
584 static void cpu_timer_fire(struct k_itimer *timer)  in cpu_timer_fire()  argument
586 	struct cpu_timer *ctmr = &timer->it.cpu;  in cpu_timer_fire()
588 	if ((timer->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE) {  in cpu_timer_fire()
593 	} else if (unlikely(timer->sigq == NULL)) {  in cpu_timer_fire()
598 		wake_up_process(timer->it_process);  in cpu_timer_fire()
600 	} else if (!timer->it_interval) {  in cpu_timer_fire()
604 		posix_timer_event(timer, 0);  in cpu_timer_fire()
606 	} else if (posix_timer_event(timer, ++timer->it_requeue_pending)) {  in cpu_timer_fire()
613 		posix_cpu_timer_rearm(timer);  in cpu_timer_fire()
614 		++timer->it_requeue_pending;  in cpu_timer_fire()
624 static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,  in posix_cpu_timer_set()  argument
627 	clockid_t clkid = CPUCLOCK_WHICH(timer->it_clock);  in posix_cpu_timer_set()
629 	struct cpu_timer *ctmr = &timer->it.cpu;  in posix_cpu_timer_set()
636 	p = cpu_timer_task_rcu(timer);  in posix_cpu_timer_set()
669 	old_incr = timer->it_interval;  in posix_cpu_timer_set()
672 	if (unlikely(timer->it.cpu.firing)) {  in posix_cpu_timer_set()
673 		timer->it.cpu.firing = -1;  in posix_cpu_timer_set()
687 	if (CPUCLOCK_PERTHREAD(timer->it_clock))  in posix_cpu_timer_set()
704 			u64 exp = bump_cpu_timer(timer, val);  in posix_cpu_timer_set()
738 		arm_timer(timer, p);  in posix_cpu_timer_set()
746 	timer->it_interval = timespec64_to_ktime(new->it_interval);  in posix_cpu_timer_set()
753 	timer->it_requeue_pending = (timer->it_requeue_pending + 2) &  in posix_cpu_timer_set()
755 	timer->it_overrun_last = 0;  in posix_cpu_timer_set()
756 	timer->it_overrun = -1;  in posix_cpu_timer_set()
765 			cpu_timer_fire(timer);  in posix_cpu_timer_set()
777 			trigger_base_recalc_expires(timer, p);  in posix_cpu_timer_set()
789 static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec64 *itp)  in posix_cpu_timer_get()  argument
791 	clockid_t clkid = CPUCLOCK_WHICH(timer->it_clock);  in posix_cpu_timer_get()
792 	struct cpu_timer *ctmr = &timer->it.cpu;  in posix_cpu_timer_get()
797 	p = cpu_timer_task_rcu(timer);  in posix_cpu_timer_get()
804 	itp->it_interval = ktime_to_timespec64(timer->it_interval);  in posix_cpu_timer_get()
812 	if (CPUCLOCK_PERTHREAD(timer->it_clock))  in posix_cpu_timer_get()
1046 static void posix_cpu_timer_rearm(struct k_itimer *timer)  in posix_cpu_timer_rearm()  argument
1048 	clockid_t clkid = CPUCLOCK_WHICH(timer->it_clock);  in posix_cpu_timer_rearm()
1055 	p = cpu_timer_task_rcu(timer);  in posix_cpu_timer_rearm()
1067 	if (CPUCLOCK_PERTHREAD(timer->it_clock))  in posix_cpu_timer_rearm()
1072 	bump_cpu_timer(timer, now);  in posix_cpu_timer_rearm()
1077 	arm_timer(timer, p);  in posix_cpu_timer_rearm()
1273 	struct k_itimer *timer, *next;  in handle_posix_cpu_timers()  local
1346 	list_for_each_entry_safe(timer, next, &firing, it.cpu.elist) {  in handle_posix_cpu_timers()
1356 		spin_lock(&timer->it_lock);  in handle_posix_cpu_timers()
1357 		list_del_init(&timer->it.cpu.elist);  in handle_posix_cpu_timers()
1358 		cpu_firing = timer->it.cpu.firing;  in handle_posix_cpu_timers()
1359 		timer->it.cpu.firing = 0;  in handle_posix_cpu_timers()
1366 			cpu_timer_fire(timer);  in handle_posix_cpu_timers()
1367 		spin_unlock(&timer->it_lock);  in handle_posix_cpu_timers()
1447 	struct k_itimer timer;  in do_cpu_nanosleep()  local
1454 	memset(&timer, 0, sizeof timer);  in do_cpu_nanosleep()
1455 	spin_lock_init(&timer.it_lock);  in do_cpu_nanosleep()
1456 	timer.it_clock = which_clock;  in do_cpu_nanosleep()
1457 	timer.it_overrun = -1;  in do_cpu_nanosleep()
1458 	error = posix_cpu_timer_create(&timer);  in do_cpu_nanosleep()
1459 	timer.it_process = current;  in do_cpu_nanosleep()
1468 		spin_lock_irq(&timer.it_lock);  in do_cpu_nanosleep()
1469 		error = posix_cpu_timer_set(&timer, flags, &it, NULL);  in do_cpu_nanosleep()
1471 			spin_unlock_irq(&timer.it_lock);  in do_cpu_nanosleep()
1476 			if (!cpu_timer_getexpires(&timer.it.cpu)) {  in do_cpu_nanosleep()
1481 				posix_cpu_timer_del(&timer);  in do_cpu_nanosleep()
1482 				spin_unlock_irq(&timer.it_lock);  in do_cpu_nanosleep()
1490 			spin_unlock_irq(&timer.it_lock);  in do_cpu_nanosleep()
1492 			spin_lock_irq(&timer.it_lock);  in do_cpu_nanosleep()
1498 		expires = cpu_timer_getexpires(&timer.it.cpu);  in do_cpu_nanosleep()
1499 		error = posix_cpu_timer_set(&timer, 0, &zero_it, &it);  in do_cpu_nanosleep()
1504 			posix_cpu_timer_del(&timer);  in do_cpu_nanosleep()
1506 		spin_unlock_irq(&timer.it_lock);  in do_cpu_nanosleep()
1514 			spin_lock_irq(&timer.it_lock);  in do_cpu_nanosleep()
1515 			error = posix_cpu_timer_del(&timer);  in do_cpu_nanosleep()
1516 			spin_unlock_irq(&timer.it_lock);  in do_cpu_nanosleep()
1591 static int process_cpu_timer_create(struct k_itimer *timer)  in process_cpu_timer_create()  argument
1593 	timer->it_clock = PROCESS_CLOCK;  in process_cpu_timer_create()
1594 	return posix_cpu_timer_create(timer);  in process_cpu_timer_create()
1611 static int thread_cpu_timer_create(struct k_itimer *timer)  in thread_cpu_timer_create()  argument
1613 	timer->it_clock = THREAD_CLOCK;  in thread_cpu_timer_create()
1614 	return posix_cpu_timer_create(timer);  in thread_cpu_timer_create()