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25#include "sysemu/sysemu.h"
26#include "monitor/monitor.h"
27#include "ui/console.h"
28
29#include "hw/hw.h"
30
31#include "qemu/timer.h"
32#ifdef CONFIG_POSIX
33#include <pthread.h>
34#endif
35
36#ifdef CONFIG_PPOLL
37#include <poll.h>
38#endif
39
40#ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK
41#include <sys/prctl.h>
42#endif
43
44
45
46
47typedef struct QEMUClock {
48
49 QLIST_HEAD(, QEMUTimerList) timerlists;
50
51 NotifierList reset_notifiers;
52 int64_t last;
53
54 QEMUClockType type;
55 bool enabled;
56} QEMUClock;
57
58QEMUTimerListGroup main_loop_tlg;
59static QEMUClock qemu_clocks[QEMU_CLOCK_MAX];
60
61
62
63
64
65
66
67
68struct QEMUTimerList {
69 QEMUClock *clock;
70 QemuMutex active_timers_lock;
71 QEMUTimer *active_timers;
72 QLIST_ENTRY(QEMUTimerList) list;
73 QEMUTimerListNotifyCB *notify_cb;
74 void *notify_opaque;
75
76
77 QemuEvent timers_done_ev;
78};
79
80
81
82
83
84
85
86
87
88static inline QEMUClock *qemu_clock_ptr(QEMUClockType type)
89{
90 return &qemu_clocks[type];
91}
92
93static bool timer_expired_ns(QEMUTimer *timer_head, int64_t current_time)
94{
95 return timer_head && (timer_head->expire_time <= current_time);
96}
97
98QEMUTimerList *timerlist_new(QEMUClockType type,
99 QEMUTimerListNotifyCB *cb,
100 void *opaque)
101{
102 QEMUTimerList *timer_list;
103 QEMUClock *clock = qemu_clock_ptr(type);
104
105 timer_list = g_malloc0(sizeof(QEMUTimerList));
106 qemu_event_init(&timer_list->timers_done_ev, false);
107 timer_list->clock = clock;
108 timer_list->notify_cb = cb;
109 timer_list->notify_opaque = opaque;
110 qemu_mutex_init(&timer_list->active_timers_lock);
111 QLIST_INSERT_HEAD(&clock->timerlists, timer_list, list);
112 return timer_list;
113}
114
115void timerlist_free(QEMUTimerList *timer_list)
116{
117 assert(!timerlist_has_timers(timer_list));
118 if (timer_list->clock) {
119 QLIST_REMOVE(timer_list, list);
120 }
121 qemu_mutex_destroy(&timer_list->active_timers_lock);
122 g_free(timer_list);
123}
124
125static void qemu_clock_init(QEMUClockType type)
126{
127 QEMUClock *clock = qemu_clock_ptr(type);
128
129
130 assert(main_loop_tlg.tl[type] == NULL);
131
132 clock->type = type;
133 clock->enabled = true;
134 clock->last = INT64_MIN;
135 QLIST_INIT(&clock->timerlists);
136 notifier_list_init(&clock->reset_notifiers);
137 main_loop_tlg.tl[type] = timerlist_new(type, NULL, NULL);
138}
139
140bool qemu_clock_use_for_deadline(QEMUClockType type)
141{
142 return !(use_icount && (type == QEMU_CLOCK_VIRTUAL));
143}
144
145void qemu_clock_notify(QEMUClockType type)
146{
147 QEMUTimerList *timer_list;
148 QEMUClock *clock = qemu_clock_ptr(type);
149 QLIST_FOREACH(timer_list, &clock->timerlists, list) {
150 timerlist_notify(timer_list);
151 }
152}
153
154
155
156
157
158
159
160
161void qemu_clock_enable(QEMUClockType type, bool enabled)
162{
163 QEMUClock *clock = qemu_clock_ptr(type);
164 QEMUTimerList *tl;
165 bool old = clock->enabled;
166 clock->enabled = enabled;
167 if (enabled && !old) {
168 qemu_clock_notify(type);
169 } else if (!enabled && old) {
170 QLIST_FOREACH(tl, &clock->timerlists, list) {
171 qemu_event_wait(&tl->timers_done_ev);
172 }
173 }
174}
175
176bool timerlist_has_timers(QEMUTimerList *timer_list)
177{
178 return !!timer_list->active_timers;
179}
180
181bool qemu_clock_has_timers(QEMUClockType type)
182{
183 return timerlist_has_timers(
184 main_loop_tlg.tl[type]);
185}
186
187bool timerlist_expired(QEMUTimerList *timer_list)
188{
189 int64_t expire_time;
190
191 qemu_mutex_lock(&timer_list->active_timers_lock);
192 if (!timer_list->active_timers) {
193 qemu_mutex_unlock(&timer_list->active_timers_lock);
194 return false;
195 }
196 expire_time = timer_list->active_timers->expire_time;
197 qemu_mutex_unlock(&timer_list->active_timers_lock);
198
199 return expire_time < qemu_clock_get_ns(timer_list->clock->type);
200}
201
202bool qemu_clock_expired(QEMUClockType type)
203{
204 return timerlist_expired(
205 main_loop_tlg.tl[type]);
206}
207
208
209
210
211
212
213int64_t timerlist_deadline_ns(QEMUTimerList *timer_list)
214{
215 int64_t delta;
216 int64_t expire_time;
217
218 if (!timer_list->clock->enabled) {
219 return -1;
220 }
221
222
223
224
225
226 qemu_mutex_lock(&timer_list->active_timers_lock);
227 if (!timer_list->active_timers) {
228 qemu_mutex_unlock(&timer_list->active_timers_lock);
229 return -1;
230 }
231 expire_time = timer_list->active_timers->expire_time;
232 qemu_mutex_unlock(&timer_list->active_timers_lock);
233
234 delta = expire_time - qemu_clock_get_ns(timer_list->clock->type);
235
236 if (delta <= 0) {
237 return 0;
238 }
239
240 return delta;
241}
242
243
244
245
246
247
248int64_t qemu_clock_deadline_ns_all(QEMUClockType type)
249{
250 int64_t deadline = -1;
251 QEMUTimerList *timer_list;
252 QEMUClock *clock = qemu_clock_ptr(type);
253 QLIST_FOREACH(timer_list, &clock->timerlists, list) {
254 deadline = qemu_soonest_timeout(deadline,
255 timerlist_deadline_ns(timer_list));
256 }
257 return deadline;
258}
259
260QEMUClockType timerlist_get_clock(QEMUTimerList *timer_list)
261{
262 return timer_list->clock->type;
263}
264
265QEMUTimerList *qemu_clock_get_main_loop_timerlist(QEMUClockType type)
266{
267 return main_loop_tlg.tl[type];
268}
269
270void timerlist_notify(QEMUTimerList *timer_list)
271{
272 if (timer_list->notify_cb) {
273 timer_list->notify_cb(timer_list->notify_opaque);
274 } else {
275 qemu_notify_event();
276 }
277}
278
279
280
281
282int qemu_timeout_ns_to_ms(int64_t ns)
283{
284 int64_t ms;
285 if (ns < 0) {
286 return -1;
287 }
288
289 if (!ns) {
290 return 0;
291 }
292
293
294
295
296 ms = (ns + SCALE_MS - 1) / SCALE_MS;
297
298
299 if (ms > (int64_t) INT32_MAX) {
300 ms = INT32_MAX;
301 }
302
303 return (int) ms;
304}
305
306
307
308
309
310int qemu_poll_ns(GPollFD *fds, guint nfds, int64_t timeout)
311{
312#ifdef CONFIG_PPOLL
313 if (timeout < 0) {
314 return ppoll((struct pollfd *)fds, nfds, NULL, NULL);
315 } else {
316 struct timespec ts;
317 ts.tv_sec = timeout / 1000000000LL;
318 ts.tv_nsec = timeout % 1000000000LL;
319 return ppoll((struct pollfd *)fds, nfds, &ts, NULL);
320 }
321#else
322 return g_poll(fds, nfds, qemu_timeout_ns_to_ms(timeout));
323#endif
324}
325
326
327void timer_init(QEMUTimer *ts,
328 QEMUTimerList *timer_list, int scale,
329 QEMUTimerCB *cb, void *opaque)
330{
331 ts->timer_list = timer_list;
332 ts->cb = cb;
333 ts->opaque = opaque;
334 ts->scale = scale;
335 ts->expire_time = -1;
336}
337
338void timer_free(QEMUTimer *ts)
339{
340 g_free(ts);
341}
342
343static void timer_del_locked(QEMUTimerList *timer_list, QEMUTimer *ts)
344{
345 QEMUTimer **pt, *t;
346
347 ts->expire_time = -1;
348 pt = &timer_list->active_timers;
349 for(;;) {
350 t = *pt;
351 if (!t)
352 break;
353 if (t == ts) {
354 *pt = t->next;
355 break;
356 }
357 pt = &t->next;
358 }
359}
360
361static bool timer_mod_ns_locked(QEMUTimerList *timer_list,
362 QEMUTimer *ts, int64_t expire_time)
363{
364 QEMUTimer **pt, *t;
365
366
367 pt = &timer_list->active_timers;
368 for (;;) {
369 t = *pt;
370 if (!timer_expired_ns(t, expire_time)) {
371 break;
372 }
373 pt = &t->next;
374 }
375 ts->expire_time = MAX(expire_time, 0);
376 ts->next = *pt;
377 *pt = ts;
378
379 return pt == &timer_list->active_timers;
380}
381
382static void timerlist_rearm(QEMUTimerList *timer_list)
383{
384
385 qemu_clock_warp(timer_list->clock->type);
386 timerlist_notify(timer_list);
387}
388
389
390void timer_del(QEMUTimer *ts)
391{
392 QEMUTimerList *timer_list = ts->timer_list;
393
394 qemu_mutex_lock(&timer_list->active_timers_lock);
395 timer_del_locked(timer_list, ts);
396 qemu_mutex_unlock(&timer_list->active_timers_lock);
397}
398
399
400
401void timer_mod_ns(QEMUTimer *ts, int64_t expire_time)
402{
403 QEMUTimerList *timer_list = ts->timer_list;
404 bool rearm;
405
406 qemu_mutex_lock(&timer_list->active_timers_lock);
407 timer_del_locked(timer_list, ts);
408 rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
409 qemu_mutex_unlock(&timer_list->active_timers_lock);
410
411 if (rearm) {
412 timerlist_rearm(timer_list);
413 }
414}
415
416
417
418
419void timer_mod_anticipate_ns(QEMUTimer *ts, int64_t expire_time)
420{
421 QEMUTimerList *timer_list = ts->timer_list;
422 bool rearm;
423
424 qemu_mutex_lock(&timer_list->active_timers_lock);
425 if (ts->expire_time == -1 || ts->expire_time > expire_time) {
426 if (ts->expire_time != -1) {
427 timer_del_locked(timer_list, ts);
428 }
429 rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
430 } else {
431 rearm = false;
432 }
433 qemu_mutex_unlock(&timer_list->active_timers_lock);
434
435 if (rearm) {
436 timerlist_rearm(timer_list);
437 }
438}
439
440void timer_mod(QEMUTimer *ts, int64_t expire_time)
441{
442 timer_mod_ns(ts, expire_time * ts->scale);
443}
444
445void timer_mod_anticipate(QEMUTimer *ts, int64_t expire_time)
446{
447 timer_mod_anticipate_ns(ts, expire_time * ts->scale);
448}
449
450bool timer_pending(QEMUTimer *ts)
451{
452 return ts->expire_time >= 0;
453}
454
455bool timer_expired(QEMUTimer *timer_head, int64_t current_time)
456{
457 return timer_expired_ns(timer_head, current_time * timer_head->scale);
458}
459
460bool timerlist_run_timers(QEMUTimerList *timer_list)
461{
462 QEMUTimer *ts;
463 int64_t current_time;
464 bool progress = false;
465 QEMUTimerCB *cb;
466 void *opaque;
467
468 qemu_event_reset(&timer_list->timers_done_ev);
469 if (!timer_list->clock->enabled) {
470 goto out;
471 }
472
473 current_time = qemu_clock_get_ns(timer_list->clock->type);
474 for(;;) {
475 qemu_mutex_lock(&timer_list->active_timers_lock);
476 ts = timer_list->active_timers;
477 if (!timer_expired_ns(ts, current_time)) {
478 qemu_mutex_unlock(&timer_list->active_timers_lock);
479 break;
480 }
481
482
483 timer_list->active_timers = ts->next;
484 ts->next = NULL;
485 ts->expire_time = -1;
486 cb = ts->cb;
487 opaque = ts->opaque;
488 qemu_mutex_unlock(&timer_list->active_timers_lock);
489
490
491 cb(opaque);
492 progress = true;
493 }
494
495out:
496 qemu_event_set(&timer_list->timers_done_ev);
497 return progress;
498}
499
500bool qemu_clock_run_timers(QEMUClockType type)
501{
502 return timerlist_run_timers(main_loop_tlg.tl[type]);
503}
504
505void timerlistgroup_init(QEMUTimerListGroup *tlg,
506 QEMUTimerListNotifyCB *cb, void *opaque)
507{
508 QEMUClockType type;
509 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
510 tlg->tl[type] = timerlist_new(type, cb, opaque);
511 }
512}
513
514void timerlistgroup_deinit(QEMUTimerListGroup *tlg)
515{
516 QEMUClockType type;
517 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
518 timerlist_free(tlg->tl[type]);
519 }
520}
521
522bool timerlistgroup_run_timers(QEMUTimerListGroup *tlg)
523{
524 QEMUClockType type;
525 bool progress = false;
526 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
527 progress |= timerlist_run_timers(tlg->tl[type]);
528 }
529 return progress;
530}
531
532int64_t timerlistgroup_deadline_ns(QEMUTimerListGroup *tlg)
533{
534 int64_t deadline = -1;
535 QEMUClockType type;
536 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
537 if (qemu_clock_use_for_deadline(tlg->tl[type]->clock->type)) {
538 deadline = qemu_soonest_timeout(deadline,
539 timerlist_deadline_ns(
540 tlg->tl[type]));
541 }
542 }
543 return deadline;
544}
545
546int64_t qemu_clock_get_ns(QEMUClockType type)
547{
548 int64_t now, last;
549 QEMUClock *clock = qemu_clock_ptr(type);
550
551 switch (type) {
552 case QEMU_CLOCK_REALTIME:
553 return get_clock();
554 default:
555 case QEMU_CLOCK_VIRTUAL:
556 if (use_icount) {
557 return cpu_get_icount();
558 } else {
559 return cpu_get_clock();
560 }
561 case QEMU_CLOCK_HOST:
562 now = get_clock_realtime();
563 last = clock->last;
564 clock->last = now;
565 if (now < last) {
566 notifier_list_notify(&clock->reset_notifiers, &now);
567 }
568 return now;
569 }
570}
571
572void qemu_clock_register_reset_notifier(QEMUClockType type,
573 Notifier *notifier)
574{
575 QEMUClock *clock = qemu_clock_ptr(type);
576 notifier_list_add(&clock->reset_notifiers, notifier);
577}
578
579void qemu_clock_unregister_reset_notifier(QEMUClockType type,
580 Notifier *notifier)
581{
582 notifier_remove(notifier);
583}
584
585void init_clocks(void)
586{
587 QEMUClockType type;
588 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
589 qemu_clock_init(type);
590 }
591
592#ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK
593 prctl(PR_SET_TIMERSLACK, 1, 0, 0, 0);
594#endif
595}
596
597uint64_t timer_expire_time_ns(QEMUTimer *ts)
598{
599 return timer_pending(ts) ? ts->expire_time : -1;
600}
601
602bool qemu_clock_run_all_timers(void)
603{
604 bool progress = false;
605 QEMUClockType type;
606
607 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
608 progress |= qemu_clock_run_timers(type);
609 }
610
611 return progress;
612}
613