1 // SPDX-License-Identifier: GPL-2.0
6  * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
7  * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
8  * Copyright(C) 2006-2007, Timesys Corp., Thomas Gleixner
24 #include "tick-internal.h"
58 static int tick_do_timer_boot_cpu __read_mostly = -1;
70  * tick_is_oneshot_available - check for a oneshot capable event device
76 	if (!dev || !(dev->features & CLOCK_EVT_FEAT_ONESHOT))  in tick_is_oneshot_available()
78 	if (!(dev->features & CLOCK_EVT_FEAT_C3STOP))  in tick_is_oneshot_available()
111 	ktime_t next = dev->next_event;  in tick_handle_periodic()
117 	 * update_process_times() -> run_local_timers() ->  in tick_handle_periodic()
120 	if (IS_ENABLED(CONFIG_TICK_ONESHOT) && dev->event_handler != tick_handle_periodic)  in tick_handle_periodic()
159 	if ((dev->features & CLOCK_EVT_FEAT_PERIODIC) &&  in tick_setup_periodic()
194 	if (!td->evtdev) {  in tick_setup_device()
211 		} else if (tick_do_timer_boot_cpu != -1 && !tick_nohz_full_cpu(cpu)) {  in tick_setup_device()
212 			tick_do_timer_boot_cpu = -1;  in tick_setup_device()
229 		td->mode = TICKDEV_MODE_PERIODIC;  in tick_setup_device()
231 		handler = td->evtdev->event_handler;  in tick_setup_device()
232 		next_event = td->evtdev->next_event;  in tick_setup_device()
233 		td->evtdev->event_handler = clockevents_handle_noop;  in tick_setup_device()
236 	td->evtdev = newdev;  in tick_setup_device()
242 	if (!cpumask_equal(newdev->cpumask, cpumask))  in tick_setup_device()
243 		irq_set_affinity(newdev->irq, cpumask);  in tick_setup_device()
255 	if (td->mode == TICKDEV_MODE_PERIODIC)  in tick_setup_device()
266 	clockevents_exchange_device(td->evtdev, newdev);  in tick_install_replacement()
268 	if (newdev->features & CLOCK_EVT_FEAT_ONESHOT)  in tick_install_replacement()
275 	if (!cpumask_test_cpu(cpu, newdev->cpumask))  in tick_check_percpu()
277 	if (cpumask_equal(newdev->cpumask, cpumask_of(cpu)))  in tick_check_percpu()
280 	if (newdev->irq >= 0 && !irq_can_set_affinity(newdev->irq))  in tick_check_percpu()
283 	if (curdev && cpumask_equal(curdev->cpumask, cpumask_of(cpu)))  in tick_check_percpu()
292 	if (!(newdev->features & CLOCK_EVT_FEAT_ONESHOT)) {  in tick_check_preferred()
293 		if (curdev && (curdev->features & CLOCK_EVT_FEAT_ONESHOT))  in tick_check_preferred()
300 	 * Use the higher rated one, but prefer a CPU local device with a lower  in tick_check_preferred()
301 	 * rating than a non-CPU local device  in tick_check_preferred()
304 		newdev->rating > curdev->rating ||  in tick_check_preferred()
305 	       !cpumask_equal(curdev->cpumask, newdev->cpumask);  in tick_check_preferred()
333 	curdev = td->evtdev;  in tick_check_new_device()
338 	if (!try_module_get(newdev->owner))  in tick_check_new_device()
352 	if (newdev->features & CLOCK_EVT_FEAT_ONESHOT)  in tick_check_new_device()
364  * tick_broadcast_oneshot_control - Enter/exit broadcast oneshot mode
368  * Returns 0 on success, -EBUSY if the cpu is used to broadcast wakeups.
378 	if (!(td->evtdev->features & CLOCK_EVT_FEAT_C3STOP))  in tick_broadcast_oneshot_control()
423 	struct clock_event_device *dev = td->evtdev;  in tick_shutdown()
425 	td->mode = TICKDEV_MODE_PERIODIC;  in tick_shutdown()
433 		dev->event_handler = clockevents_handle_noop;  in tick_shutdown()
434 		td->evtdev = NULL;  in tick_shutdown()
440  * tick_suspend_local - Suspend the local tick device
450 	clockevents_shutdown(td->evtdev);  in tick_suspend_local()
454  * tick_resume_local - Resume the local tick device
465 	clockevents_tick_resume(td->evtdev);  in tick_resume_local()
467 		if (td->mode == TICKDEV_MODE_PERIODIC)  in tick_resume_local()
468 			tick_setup_periodic(td->evtdev, 0);  in tick_resume_local()
482  * tick_suspend - Suspend the tick and the broadcast device
497  * tick_resume - Resume the tick and the broadcast device
515  * tick_freeze - Suspend the local tick and (possibly) timekeeping.
542  * tick_unfreeze - Resume the local tick and (possibly) timekeeping.
565 	tick_freeze_depth--;  in tick_unfreeze()
572  * tick_init - initialize the tick control