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()
416 static struct posix_cputimer_base *timer_base(struct k_itimer *timer,  in timer_base()  argument
419 	int clkidx = CPUCLOCK_WHICH(timer->it_clock);  in timer_base()
421 	if (CPUCLOCK_PERTHREAD(timer->it_clock))  in timer_base()
433 static void trigger_base_recalc_expires(struct k_itimer *timer,  in trigger_base_recalc_expires()  argument
436 	struct posix_cputimer_base *base = timer_base(timer, tsk);  in trigger_base_recalc_expires()
451 static void disarm_timer(struct k_itimer *timer, struct task_struct *p)  in disarm_timer()  argument
453 	struct cpu_timer *ctmr = &timer->it.cpu;  in disarm_timer()
459 	base = timer_base(timer, p);  in disarm_timer()
461 		trigger_base_recalc_expires(timer, p);  in disarm_timer()
471 static int posix_cpu_timer_del(struct k_itimer *timer)  in posix_cpu_timer_del()  argument
473 	struct cpu_timer *ctmr = &timer->it.cpu;  in posix_cpu_timer_del()
480 	p = cpu_timer_task_rcu(timer);  in posix_cpu_timer_del()
496 		if (timer->it.cpu.firing)  in posix_cpu_timer_del()
499 			disarm_timer(timer, p);  in posix_cpu_timer_del()
556 static void arm_timer(struct k_itimer *timer, struct task_struct *p)  in arm_timer()  argument
558 	struct posix_cputimer_base *base = timer_base(timer, p);  in arm_timer()
559 	struct cpu_timer *ctmr = &timer->it.cpu;  in arm_timer()
574 	if (CPUCLOCK_PERTHREAD(timer->it_clock))  in arm_timer()
583 static void cpu_timer_fire(struct k_itimer *timer)  in cpu_timer_fire()  argument
585 	struct cpu_timer *ctmr = &timer->it.cpu;  in cpu_timer_fire()
587 	if ((timer->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE) {  in cpu_timer_fire()
592 	} else if (unlikely(timer->sigq == NULL)) {  in cpu_timer_fire()
597 		wake_up_process(timer->it_process);  in cpu_timer_fire()
599 	} else if (!timer->it_interval) {  in cpu_timer_fire()
603 		posix_timer_event(timer, 0);  in cpu_timer_fire()
605 	} else if (posix_timer_event(timer, ++timer->it_requeue_pending)) {  in cpu_timer_fire()
612 		posix_cpu_timer_rearm(timer);  in cpu_timer_fire()
613 		++timer->it_requeue_pending;  in cpu_timer_fire()
623 static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,  in posix_cpu_timer_set()  argument
626 	clockid_t clkid = CPUCLOCK_WHICH(timer->it_clock);  in posix_cpu_timer_set()
628 	struct cpu_timer *ctmr = &timer->it.cpu;  in posix_cpu_timer_set()
635 	p = cpu_timer_task_rcu(timer);  in posix_cpu_timer_set()
668 	old_incr = timer->it_interval;  in posix_cpu_timer_set()
671 	if (unlikely(timer->it.cpu.firing)) {  in posix_cpu_timer_set()
672 		timer->it.cpu.firing = -1;  in posix_cpu_timer_set()
686 	if (CPUCLOCK_PERTHREAD(timer->it_clock))  in posix_cpu_timer_set()
703 			u64 exp = bump_cpu_timer(timer, val);  in posix_cpu_timer_set()
737 		arm_timer(timer, p);  in posix_cpu_timer_set()
745 	timer->it_interval = timespec64_to_ktime(new->it_interval);  in posix_cpu_timer_set()
752 	timer->it_requeue_pending = (timer->it_requeue_pending + 2) &  in posix_cpu_timer_set()
754 	timer->it_overrun_last = 0;  in posix_cpu_timer_set()
755 	timer->it_overrun = -1;  in posix_cpu_timer_set()
764 			cpu_timer_fire(timer);  in posix_cpu_timer_set()
776 			trigger_base_recalc_expires(timer, p);  in posix_cpu_timer_set()
788 static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec64 *itp)  in posix_cpu_timer_get()  argument
790 	clockid_t clkid = CPUCLOCK_WHICH(timer->it_clock);  in posix_cpu_timer_get()
791 	struct cpu_timer *ctmr = &timer->it.cpu;  in posix_cpu_timer_get()
796 	p = cpu_timer_task_rcu(timer);  in posix_cpu_timer_get()
803 	itp->it_interval = ktime_to_timespec64(timer->it_interval);  in posix_cpu_timer_get()
811 	if (CPUCLOCK_PERTHREAD(timer->it_clock))  in posix_cpu_timer_get()
1047 static void posix_cpu_timer_rearm(struct k_itimer *timer)  in posix_cpu_timer_rearm()  argument
1049 	clockid_t clkid = CPUCLOCK_WHICH(timer->it_clock);  in posix_cpu_timer_rearm()
1056 	p = cpu_timer_task_rcu(timer);  in posix_cpu_timer_rearm()
1068 	if (CPUCLOCK_PERTHREAD(timer->it_clock))  in posix_cpu_timer_rearm()
1073 	bump_cpu_timer(timer, now);  in posix_cpu_timer_rearm()
1078 	arm_timer(timer, p);  in posix_cpu_timer_rearm()
1329 	struct k_itimer *timer, *next;  in handle_posix_cpu_timers()  local
1402 	list_for_each_entry_safe(timer, next, &firing, it.cpu.elist) {  in handle_posix_cpu_timers()
1412 		spin_lock(&timer->it_lock);  in handle_posix_cpu_timers()
1413 		list_del_init(&timer->it.cpu.elist);  in handle_posix_cpu_timers()
1414 		cpu_firing = timer->it.cpu.firing;  in handle_posix_cpu_timers()
1415 		timer->it.cpu.firing = 0;  in handle_posix_cpu_timers()
1422 			cpu_timer_fire(timer);  in handle_posix_cpu_timers()
1424 		rcu_assign_pointer(timer->it.cpu.handling, NULL);  in handle_posix_cpu_timers()
1425 		spin_unlock(&timer->it_lock);  in handle_posix_cpu_timers()
1505 	struct k_itimer timer;  in do_cpu_nanosleep()  local
1512 	memset(&timer, 0, sizeof timer);  in do_cpu_nanosleep()
1513 	spin_lock_init(&timer.it_lock);  in do_cpu_nanosleep()
1514 	timer.it_clock = which_clock;  in do_cpu_nanosleep()
1515 	timer.it_overrun = -1;  in do_cpu_nanosleep()
1516 	error = posix_cpu_timer_create(&timer);  in do_cpu_nanosleep()
1517 	timer.it_process = current;  in do_cpu_nanosleep()
1526 		spin_lock_irq(&timer.it_lock);  in do_cpu_nanosleep()
1527 		error = posix_cpu_timer_set(&timer, flags, &it, NULL);  in do_cpu_nanosleep()
1529 			spin_unlock_irq(&timer.it_lock);  in do_cpu_nanosleep()
1534 			if (!cpu_timer_getexpires(&timer.it.cpu)) {  in do_cpu_nanosleep()
1539 				posix_cpu_timer_del(&timer);  in do_cpu_nanosleep()
1540 				spin_unlock_irq(&timer.it_lock);  in do_cpu_nanosleep()
1548 			spin_unlock_irq(&timer.it_lock);  in do_cpu_nanosleep()
1550 			spin_lock_irq(&timer.it_lock);  in do_cpu_nanosleep()
1556 		expires = cpu_timer_getexpires(&timer.it.cpu);  in do_cpu_nanosleep()
1557 		error = posix_cpu_timer_set(&timer, 0, &zero_it, &it);  in do_cpu_nanosleep()
1560 			posix_cpu_timer_del(&timer);  in do_cpu_nanosleep()
1563 				posix_cpu_timer_wait_running_nsleep(&timer);  in do_cpu_nanosleep()
1564 				error = posix_cpu_timer_del(&timer);  in do_cpu_nanosleep()
1568 		spin_unlock_irq(&timer.it_lock);  in do_cpu_nanosleep()
1642 static int process_cpu_timer_create(struct k_itimer *timer)  in process_cpu_timer_create()  argument
1644 	timer->it_clock = PROCESS_CLOCK;  in process_cpu_timer_create()
1645 	return posix_cpu_timer_create(timer);  in process_cpu_timer_create()
1662 static int thread_cpu_timer_create(struct k_itimer *timer)  in thread_cpu_timer_create()  argument
1664 	timer->it_clock = THREAD_CLOCK;  in thread_cpu_timer_create()
1665 	return posix_cpu_timer_create(timer);  in thread_cpu_timer_create()