s390/kernel/vtime.c

3  *    Virtual cpu timer based timer functions.
39 	u64 timer;
42 		"	stpt	%0\n"	/* Store current cpu timer value */
44 		: "=Q" (timer) : "Q" (expires));
45 	lc->system_timer += lc->last_update_timer - timer;
120 	u64 timer, clock, user, guest, system, hardirq, softirq;
123 	timer = lc->last_update_timer;
126 		"	stpt	%0\n"	/* Store current cpu timer value */
132 	timer -= lc->last_update_timer;
135 		lc->hardirq_timer += timer;
137 		lc->system_timer += timer;
222 	u64 timer = lc->last_update_timer;
225 	return timer - lc->last_update_timer;
268 static void list_add_sorted(struct vtimer_list *timer, struct list_head *head)
273 		if (tmp->expires > timer->expires) {
274 			list_add_tail(&timer->entry, &tmp->entry);
278 	list_add_tail(&timer->entry, head);
282  * Handler for expired virtual CPU timer.
286 	struct vtimer_list *timer, *tmp;
290 	/* walk timer list, fire all expired timers */
293 	list_for_each_entry_safe(timer, tmp, &virt_timer_list, entry) {
294 		if (timer->expires < elapsed)
295 			/* move expired timer to the callback queue */
296 			list_move_tail(&timer->entry, &cb_list);
298 			timer->expires -= elapsed;
301 		timer = list_first_entry(&virt_timer_list,
303 		atomic64_set(&virt_timer_current, timer->expires);
309 	list_for_each_entry_safe(timer, tmp, &cb_list, entry) {
310 		list_del_init(&timer->entry);
311 		timer->function(timer->data);
312 		if (timer->interval) {
313 			/* Recharge interval timer */
314 			timer->expires = timer->interval +
317 			list_add_sorted(timer, &virt_timer_list);
323 void init_virt_timer(struct vtimer_list *timer)
325 	timer->function = NULL;
326 	INIT_LIST_HEAD(&timer->entry);
330 static inline int vtimer_pending(struct vtimer_list *timer)
332 	return !list_empty(&timer->entry);
335 static void internal_add_vtimer(struct vtimer_list *timer)
338 		/* First timer, just program it. */
339 		atomic64_set(&virt_timer_current, timer->expires);
341 		list_add(&timer->entry, &virt_timer_list);
343 		/* Update timer against current base. */
344 		timer->expires += atomic64_read(&virt_timer_elapsed);
345 		if (likely((s64) timer->expires <
347 			/* The new timer expires before the current timer. */
348 			atomic64_set(&virt_timer_current, timer->expires);
349 		/* Insert new timer into the list. */
350 		list_add_sorted(timer, &virt_timer_list);
354 static void __add_vtimer(struct vtimer_list *timer, int periodic)
358 	timer->interval = periodic ? timer->expires : 0;
360 	internal_add_vtimer(timer);
365  * add_virt_timer - add a oneshot virtual CPU timer
367 void add_virt_timer(struct vtimer_list *timer)
369 	__add_vtimer(timer, 0);
374  * add_virt_timer_int - add an interval virtual CPU timer
376 void add_virt_timer_periodic(struct vtimer_list *timer)
378 	__add_vtimer(timer, 1);
382 static int __mod_vtimer(struct vtimer_list *timer, u64 expires, int periodic)
387 	BUG_ON(!timer->function);
389 	if (timer->expires == expires && vtimer_pending(timer))
392 	rc = vtimer_pending(timer);
394 		list_del_init(&timer->entry);
395 	timer->interval = periodic ? expires : 0;
396 	timer->expires = expires;
397 	internal_add_vtimer(timer);
403  * returns whether it has modified a pending timer (1) or not (0)
405 int mod_virt_timer(struct vtimer_list *timer, u64 expires)
407 	return __mod_vtimer(timer, expires, 0);
412  * returns whether it has modified a pending timer (1) or not (0)
414 int mod_virt_timer_periodic(struct vtimer_list *timer, u64 expires)
416 	return __mod_vtimer(timer, expires, 1);
421  * Delete a virtual timer.
423  * returns whether the deleted timer was pending (1) or not (0)
425 int del_virt_timer(struct vtimer_list *timer)
429 	if (!vtimer_pending(timer))
432 	list_del_init(&timer->entry);
439  * Start the virtual CPU timer on the current CPU.
443 	/* set initial cpu timer */