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Paolo Bonzinidb1a4972010-03-10 11:38:55 +01001/*
2 * QEMU System Emulator
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
Peter Maydelld38ea872016-01-29 17:50:05 +000025#include "qemu/osdep.h"
Peter Maydell1ac02062015-01-20 16:16:40 +000026#include "qemu/main-loop.h"
Paolo Bonzini1de7afc2012-12-17 18:20:00 +010027#include "qemu/timer.h"
Pavel Dovgalyuk8eda2062015-09-17 19:24:28 +030028#include "sysemu/replay.h"
Pavel Dovgalyuk8bd7f712015-09-17 19:24:44 +030029#include "sysemu/sysemu.h"
Peter Maydell1ac02062015-01-20 16:16:40 +000030
Anthony Liguori30ea8332012-11-02 16:12:53 -050031#ifdef CONFIG_POSIX
32#include <pthread.h>
33#endif
Stefan Weilbff9f8b2012-04-20 10:27:06 +020034
Alex Bligh4e0c6522013-08-21 16:02:43 +010035#ifdef CONFIG_PPOLL
36#include <poll.h>
37#endif
38
Alex Blighcd758dd2013-08-21 16:02:44 +010039#ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK
40#include <sys/prctl.h>
41#endif
42
Paolo Bonzinidb1a4972010-03-10 11:38:55 +010043/***********************************************************/
44/* timers */
45
Alex Blighb4049b72013-08-21 16:03:09 +010046typedef struct QEMUClock {
Liu Ping Fan3c053412013-09-25 14:21:00 +080047 /* We rely on BQL to protect the timerlists */
Alex Blighff83c662013-08-21 16:02:46 +010048 QLIST_HEAD(, QEMUTimerList) timerlists;
Jan Kiszka691a0c92011-06-20 14:06:27 +020049
50 NotifierList reset_notifiers;
51 int64_t last;
Stefan Weil9a14b292012-04-20 11:51:58 +020052
Alex Blighff83c662013-08-21 16:02:46 +010053 QEMUClockType type;
Stefan Weil9a14b292012-04-20 11:51:58 +020054 bool enabled;
Alex Blighb4049b72013-08-21 16:03:09 +010055} QEMUClock;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +010056
Alex Bligh754d6a52013-08-21 16:02:48 +010057QEMUTimerListGroup main_loop_tlg;
Stefan Weilfbdb6642014-05-03 08:12:15 +020058static QEMUClock qemu_clocks[QEMU_CLOCK_MAX];
Alex Blighff83c662013-08-21 16:02:46 +010059
60/* A QEMUTimerList is a list of timers attached to a clock. More
61 * than one QEMUTimerList can be attached to each clock, for instance
62 * used by different AioContexts / threads. Each clock also has
63 * a list of the QEMUTimerLists associated with it, in order that
64 * reenabling the clock can call all the notifiers.
65 */
66
67struct QEMUTimerList {
Stefan Weil9a14b292012-04-20 11:51:58 +020068 QEMUClock *clock;
Stefan Hajnoczi978f2202013-09-12 11:02:19 +020069 QemuMutex active_timers_lock;
Alex Blighff83c662013-08-21 16:02:46 +010070 QEMUTimer *active_timers;
71 QLIST_ENTRY(QEMUTimerList) list;
Alex Blighd5541d82013-08-21 16:02:50 +010072 QEMUTimerListNotifyCB *notify_cb;
73 void *notify_opaque;
Liu Ping Fan3c053412013-09-25 14:21:00 +080074
75 /* lightweight method to mark the end of timerlist's running */
76 QemuEvent timers_done_ev;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +010077};
78
Alex Bligh7bf8fbd2013-08-21 16:03:03 +010079/**
80 * qemu_clock_ptr:
81 * @type: type of clock
82 *
83 * Translate a clock type into a pointer to QEMUClock object.
84 *
85 * Returns: a pointer to the QEMUClock object
86 */
Alex Blighb4049b72013-08-21 16:03:09 +010087static inline QEMUClock *qemu_clock_ptr(QEMUClockType type)
Alex Bligh7bf8fbd2013-08-21 16:03:03 +010088{
89 return &qemu_clocks[type];
90}
91
Alex Blighe93379b2013-08-21 16:02:39 +010092static bool timer_expired_ns(QEMUTimer *timer_head, int64_t current_time)
Stefan Weil45c7b372011-03-24 21:31:24 +010093{
94 return timer_head && (timer_head->expire_time <= current_time);
95}
96
Alex Bligh7bf8fbd2013-08-21 16:03:03 +010097QEMUTimerList *timerlist_new(QEMUClockType type,
98 QEMUTimerListNotifyCB *cb,
99 void *opaque)
Alex Blighff83c662013-08-21 16:02:46 +0100100{
101 QEMUTimerList *timer_list;
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100102 QEMUClock *clock = qemu_clock_ptr(type);
Alex Blighff83c662013-08-21 16:02:46 +0100103
104 timer_list = g_malloc0(sizeof(QEMUTimerList));
Paolo Bonzinie4efd8a2015-07-21 16:07:48 +0200105 qemu_event_init(&timer_list->timers_done_ev, true);
Alex Blighff83c662013-08-21 16:02:46 +0100106 timer_list->clock = clock;
Alex Blighd5541d82013-08-21 16:02:50 +0100107 timer_list->notify_cb = cb;
108 timer_list->notify_opaque = opaque;
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200109 qemu_mutex_init(&timer_list->active_timers_lock);
Alex Blighff83c662013-08-21 16:02:46 +0100110 QLIST_INSERT_HEAD(&clock->timerlists, timer_list, list);
111 return timer_list;
112}
113
Alex Blighff83c662013-08-21 16:02:46 +0100114void timerlist_free(QEMUTimerList *timer_list)
115{
116 assert(!timerlist_has_timers(timer_list));
117 if (timer_list->clock) {
118 QLIST_REMOVE(timer_list, list);
Alex Blighff83c662013-08-21 16:02:46 +0100119 }
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200120 qemu_mutex_destroy(&timer_list->active_timers_lock);
Alex Blighff83c662013-08-21 16:02:46 +0100121 g_free(timer_list);
122}
123
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100124static void qemu_clock_init(QEMUClockType type)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100125{
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100126 QEMUClock *clock = qemu_clock_ptr(type);
Jan Kiszka691a0c92011-06-20 14:06:27 +0200127
Kirill Batuzov02ce2322014-05-06 16:59:53 +0400128 /* Assert that the clock of type TYPE has not been initialized yet. */
129 assert(main_loop_tlg.tl[type] == NULL);
130
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100131 clock->type = type;
Stefan Weil5e1ec7b2012-04-20 10:45:48 +0200132 clock->enabled = true;
Paolo Bonzini2ff68d02011-09-12 16:21:44 +0200133 clock->last = INT64_MIN;
Alex Blighff83c662013-08-21 16:02:46 +0100134 QLIST_INIT(&clock->timerlists);
Jan Kiszka691a0c92011-06-20 14:06:27 +0200135 notifier_list_init(&clock->reset_notifiers);
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100136 main_loop_tlg.tl[type] = timerlist_new(type, NULL, NULL);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100137}
138
Alex Bligh40daca52013-08-21 16:03:02 +0100139bool qemu_clock_use_for_deadline(QEMUClockType type)
Alex Blighff83c662013-08-21 16:02:46 +0100140{
Alex Bligh40daca52013-08-21 16:03:02 +0100141 return !(use_icount && (type == QEMU_CLOCK_VIRTUAL));
Alex Blighff83c662013-08-21 16:02:46 +0100142}
143
Alex Bligh40daca52013-08-21 16:03:02 +0100144void qemu_clock_notify(QEMUClockType type)
Alex Blighb1bbfe72013-08-21 16:02:55 +0100145{
146 QEMUTimerList *timer_list;
Alex Bligh40daca52013-08-21 16:03:02 +0100147 QEMUClock *clock = qemu_clock_ptr(type);
Alex Blighb1bbfe72013-08-21 16:02:55 +0100148 QLIST_FOREACH(timer_list, &clock->timerlists, list) {
149 timerlist_notify(timer_list);
150 }
151}
152
Liu Ping Fan3c053412013-09-25 14:21:00 +0800153/* Disabling the clock will wait for related timerlists to stop
154 * executing qemu_run_timers. Thus, this functions should not
155 * be used from the callback of a timer that is based on @clock.
156 * Doing so would cause a deadlock.
157 *
158 * Caller should hold BQL.
159 */
Alex Bligh40daca52013-08-21 16:03:02 +0100160void qemu_clock_enable(QEMUClockType type, bool enabled)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100161{
Alex Bligh40daca52013-08-21 16:03:02 +0100162 QEMUClock *clock = qemu_clock_ptr(type);
Liu Ping Fan3c053412013-09-25 14:21:00 +0800163 QEMUTimerList *tl;
Paolo Bonzinifbdc14e2011-09-27 18:23:14 +0200164 bool old = clock->enabled;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100165 clock->enabled = enabled;
Paolo Bonzinifbdc14e2011-09-27 18:23:14 +0200166 if (enabled && !old) {
Alex Bligh40daca52013-08-21 16:03:02 +0100167 qemu_clock_notify(type);
Liu Ping Fan3c053412013-09-25 14:21:00 +0800168 } else if (!enabled && old) {
169 QLIST_FOREACH(tl, &clock->timerlists, list) {
170 qemu_event_wait(&tl->timers_done_ev);
171 }
Paolo Bonzinifbdc14e2011-09-27 18:23:14 +0200172 }
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100173}
174
Alex Blighff83c662013-08-21 16:02:46 +0100175bool timerlist_has_timers(QEMUTimerList *timer_list)
Paolo Bonzinidc2dfcf2011-09-12 15:50:16 +0200176{
Alex Blighff83c662013-08-21 16:02:46 +0100177 return !!timer_list->active_timers;
Paolo Bonzinidc2dfcf2011-09-12 15:50:16 +0200178}
179
Alex Bligh40daca52013-08-21 16:03:02 +0100180bool qemu_clock_has_timers(QEMUClockType type)
Paolo Bonzinidc2dfcf2011-09-12 15:50:16 +0200181{
Alex Bligh40daca52013-08-21 16:03:02 +0100182 return timerlist_has_timers(
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100183 main_loop_tlg.tl[type]);
Paolo Bonzinidc2dfcf2011-09-12 15:50:16 +0200184}
185
Alex Blighff83c662013-08-21 16:02:46 +0100186bool timerlist_expired(QEMUTimerList *timer_list)
187{
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200188 int64_t expire_time;
189
190 qemu_mutex_lock(&timer_list->active_timers_lock);
191 if (!timer_list->active_timers) {
192 qemu_mutex_unlock(&timer_list->active_timers_lock);
193 return false;
194 }
195 expire_time = timer_list->active_timers->expire_time;
196 qemu_mutex_unlock(&timer_list->active_timers_lock);
197
198 return expire_time < qemu_clock_get_ns(timer_list->clock->type);
Alex Blighff83c662013-08-21 16:02:46 +0100199}
200
Alex Bligh40daca52013-08-21 16:03:02 +0100201bool qemu_clock_expired(QEMUClockType type)
Alex Blighff83c662013-08-21 16:02:46 +0100202{
Alex Bligh40daca52013-08-21 16:03:02 +0100203 return timerlist_expired(
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100204 main_loop_tlg.tl[type]);
Alex Blighff83c662013-08-21 16:02:46 +0100205}
206
Alex Bligh02a03a92013-08-21 16:02:41 +0100207/*
208 * As above, but return -1 for no deadline, and do not cap to 2^32
209 * as we know the result is always positive.
210 */
211
Alex Blighff83c662013-08-21 16:02:46 +0100212int64_t timerlist_deadline_ns(QEMUTimerList *timer_list)
Alex Bligh02a03a92013-08-21 16:02:41 +0100213{
214 int64_t delta;
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200215 int64_t expire_time;
Alex Bligh02a03a92013-08-21 16:02:41 +0100216
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200217 if (!timer_list->clock->enabled) {
Alex Bligh02a03a92013-08-21 16:02:41 +0100218 return -1;
219 }
220
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200221 /* The active timers list may be modified before the caller uses our return
222 * value but ->notify_cb() is called when the deadline changes. Therefore
223 * the caller should notice the change and there is no race condition.
224 */
225 qemu_mutex_lock(&timer_list->active_timers_lock);
226 if (!timer_list->active_timers) {
227 qemu_mutex_unlock(&timer_list->active_timers_lock);
228 return -1;
229 }
230 expire_time = timer_list->active_timers->expire_time;
231 qemu_mutex_unlock(&timer_list->active_timers_lock);
232
233 delta = expire_time - qemu_clock_get_ns(timer_list->clock->type);
Alex Bligh02a03a92013-08-21 16:02:41 +0100234
235 if (delta <= 0) {
236 return 0;
237 }
238
239 return delta;
240}
241
Alex Blighac70aaf2013-08-21 16:02:57 +0100242/* Calculate the soonest deadline across all timerlists attached
243 * to the clock. This is used for the icount timeout so we
244 * ignore whether or not the clock should be used in deadline
245 * calculations.
246 */
Alex Bligh40daca52013-08-21 16:03:02 +0100247int64_t qemu_clock_deadline_ns_all(QEMUClockType type)
Alex Blighac70aaf2013-08-21 16:02:57 +0100248{
249 int64_t deadline = -1;
250 QEMUTimerList *timer_list;
Alex Bligh40daca52013-08-21 16:03:02 +0100251 QEMUClock *clock = qemu_clock_ptr(type);
Alex Blighac70aaf2013-08-21 16:02:57 +0100252 QLIST_FOREACH(timer_list, &clock->timerlists, list) {
253 deadline = qemu_soonest_timeout(deadline,
254 timerlist_deadline_ns(timer_list));
255 }
256 return deadline;
257}
258
Alex Bligh40daca52013-08-21 16:03:02 +0100259QEMUClockType timerlist_get_clock(QEMUTimerList *timer_list)
Alex Blighff83c662013-08-21 16:02:46 +0100260{
Alex Bligh40daca52013-08-21 16:03:02 +0100261 return timer_list->clock->type;
Alex Blighff83c662013-08-21 16:02:46 +0100262}
263
Alex Bligh40daca52013-08-21 16:03:02 +0100264QEMUTimerList *qemu_clock_get_main_loop_timerlist(QEMUClockType type)
Alex Blighff83c662013-08-21 16:02:46 +0100265{
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100266 return main_loop_tlg.tl[type];
Alex Blighff83c662013-08-21 16:02:46 +0100267}
268
Alex Blighd5541d82013-08-21 16:02:50 +0100269void timerlist_notify(QEMUTimerList *timer_list)
270{
271 if (timer_list->notify_cb) {
272 timer_list->notify_cb(timer_list->notify_opaque);
273 } else {
274 qemu_notify_event();
275 }
276}
277
Alex Bligh02a03a92013-08-21 16:02:41 +0100278/* Transition function to convert a nanosecond timeout to ms
279 * This is used where a system does not support ppoll
280 */
281int qemu_timeout_ns_to_ms(int64_t ns)
282{
283 int64_t ms;
284 if (ns < 0) {
285 return -1;
286 }
287
288 if (!ns) {
289 return 0;
290 }
291
292 /* Always round up, because it's better to wait too long than to wait too
293 * little and effectively busy-wait
294 */
295 ms = (ns + SCALE_MS - 1) / SCALE_MS;
296
297 /* To avoid overflow problems, limit this to 2^31, i.e. approx 25 days */
298 if (ms > (int64_t) INT32_MAX) {
299 ms = INT32_MAX;
300 }
301
302 return (int) ms;
303}
304
305
Alex Bligh4e0c6522013-08-21 16:02:43 +0100306/* qemu implementation of g_poll which uses a nanosecond timeout but is
307 * otherwise identical to g_poll
308 */
309int qemu_poll_ns(GPollFD *fds, guint nfds, int64_t timeout)
310{
311#ifdef CONFIG_PPOLL
312 if (timeout < 0) {
313 return ppoll((struct pollfd *)fds, nfds, NULL, NULL);
314 } else {
315 struct timespec ts;
Peter Maydell490309f2014-11-25 18:21:45 +0000316 int64_t tvsec = timeout / 1000000000LL;
317 /* Avoid possibly overflowing and specifying a negative number of
318 * seconds, which would turn a very long timeout into a busy-wait.
319 */
320 if (tvsec > (int64_t)INT32_MAX) {
321 tvsec = INT32_MAX;
322 }
323 ts.tv_sec = tvsec;
Alex Bligh4e0c6522013-08-21 16:02:43 +0100324 ts.tv_nsec = timeout % 1000000000LL;
325 return ppoll((struct pollfd *)fds, nfds, &ts, NULL);
326 }
327#else
328 return g_poll(fds, nfds, qemu_timeout_ns_to_ms(timeout));
329#endif
330}
331
332
Paolo Bonzinif186aa92014-12-23 21:54:14 +0100333void timer_init_tl(QEMUTimer *ts,
334 QEMUTimerList *timer_list, int scale,
335 QEMUTimerCB *cb, void *opaque)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100336{
Alex Blighff83c662013-08-21 16:02:46 +0100337 ts->timer_list = timer_list;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100338 ts->cb = cb;
339 ts->opaque = opaque;
Paolo Bonzini4a998742011-03-11 16:33:58 +0100340 ts->scale = scale;
Paolo Bonzini3db1ee72013-09-12 11:02:20 +0200341 ts->expire_time = -1;
Alex Blighff83c662013-08-21 16:02:46 +0100342}
343
Paolo Bonzinicd1bd532014-12-24 10:57:04 +0100344void timer_deinit(QEMUTimer *ts)
345{
346 assert(ts->expire_time == -1);
347 ts->timer_list = NULL;
348}
349
Alex Bligh40daca52013-08-21 16:03:02 +0100350void timer_free(QEMUTimer *ts)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100351{
Anthony Liguori7267c092011-08-20 22:09:37 -0500352 g_free(ts);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100353}
354
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200355static void timer_del_locked(QEMUTimerList *timer_list, QEMUTimer *ts)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100356{
357 QEMUTimer **pt, *t;
358
Paolo Bonzini3db1ee72013-09-12 11:02:20 +0200359 ts->expire_time = -1;
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200360 pt = &timer_list->active_timers;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100361 for(;;) {
362 t = *pt;
363 if (!t)
364 break;
365 if (t == ts) {
366 *pt = t->next;
367 break;
368 }
369 pt = &t->next;
370 }
371}
372
Paolo Bonzini0f809e52013-10-03 15:06:39 +0200373static bool timer_mod_ns_locked(QEMUTimerList *timer_list,
374 QEMUTimer *ts, int64_t expire_time)
375{
376 QEMUTimer **pt, *t;
377
378 /* add the timer in the sorted list */
379 pt = &timer_list->active_timers;
380 for (;;) {
381 t = *pt;
382 if (!timer_expired_ns(t, expire_time)) {
383 break;
384 }
385 pt = &t->next;
386 }
387 ts->expire_time = MAX(expire_time, 0);
388 ts->next = *pt;
389 *pt = ts;
390
391 return pt == &timer_list->active_timers;
392}
393
394static void timerlist_rearm(QEMUTimerList *timer_list)
395{
396 /* Interrupt execution to force deadline recalculation. */
Pavel Dovgalyuke76d1792016-03-10 14:56:09 +0300397 if (timer_list->clock->type == QEMU_CLOCK_VIRTUAL) {
398 qemu_start_warp_timer();
399 }
Paolo Bonzini0f809e52013-10-03 15:06:39 +0200400 timerlist_notify(timer_list);
401}
402
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200403/* stop a timer, but do not dealloc it */
404void timer_del(QEMUTimer *ts)
405{
406 QEMUTimerList *timer_list = ts->timer_list;
407
Paolo Bonzinicd1bd532014-12-24 10:57:04 +0100408 if (timer_list) {
409 qemu_mutex_lock(&timer_list->active_timers_lock);
410 timer_del_locked(timer_list, ts);
411 qemu_mutex_unlock(&timer_list->active_timers_lock);
412 }
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200413}
414
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100415/* modify the current timer so that it will be fired when current_time
416 >= expire_time. The corresponding callback will be called. */
Alex Bligh40daca52013-08-21 16:03:02 +0100417void timer_mod_ns(QEMUTimer *ts, int64_t expire_time)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100418{
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200419 QEMUTimerList *timer_list = ts->timer_list;
Paolo Bonzini0f809e52013-10-03 15:06:39 +0200420 bool rearm;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100421
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200422 qemu_mutex_lock(&timer_list->active_timers_lock);
423 timer_del_locked(timer_list, ts);
Paolo Bonzini0f809e52013-10-03 15:06:39 +0200424 rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200425 qemu_mutex_unlock(&timer_list->active_timers_lock);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100426
Paolo Bonzini0f809e52013-10-03 15:06:39 +0200427 if (rearm) {
428 timerlist_rearm(timer_list);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100429 }
430}
431
Paolo Bonziniadd40e92013-10-03 15:11:43 +0200432/* modify the current timer so that it will be fired when current_time
433 >= expire_time or the current deadline, whichever comes earlier.
434 The corresponding callback will be called. */
435void timer_mod_anticipate_ns(QEMUTimer *ts, int64_t expire_time)
436{
437 QEMUTimerList *timer_list = ts->timer_list;
438 bool rearm;
439
440 qemu_mutex_lock(&timer_list->active_timers_lock);
441 if (ts->expire_time == -1 || ts->expire_time > expire_time) {
442 if (ts->expire_time != -1) {
443 timer_del_locked(timer_list, ts);
444 }
445 rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
446 } else {
447 rearm = false;
448 }
449 qemu_mutex_unlock(&timer_list->active_timers_lock);
450
451 if (rearm) {
452 timerlist_rearm(timer_list);
453 }
454}
455
Alex Bligh40daca52013-08-21 16:03:02 +0100456void timer_mod(QEMUTimer *ts, int64_t expire_time)
Paolo Bonzini4a998742011-03-11 16:33:58 +0100457{
Alex Bligh40daca52013-08-21 16:03:02 +0100458 timer_mod_ns(ts, expire_time * ts->scale);
Paolo Bonzini4a998742011-03-11 16:33:58 +0100459}
460
Paolo Bonziniadd40e92013-10-03 15:11:43 +0200461void timer_mod_anticipate(QEMUTimer *ts, int64_t expire_time)
462{
463 timer_mod_anticipate_ns(ts, expire_time * ts->scale);
464}
465
Alex Blighe93379b2013-08-21 16:02:39 +0100466bool timer_pending(QEMUTimer *ts)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100467{
Paolo Bonzini3db1ee72013-09-12 11:02:20 +0200468 return ts->expire_time >= 0;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100469}
470
Alex Blighe93379b2013-08-21 16:02:39 +0100471bool timer_expired(QEMUTimer *timer_head, int64_t current_time)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100472{
Alex Blighe93379b2013-08-21 16:02:39 +0100473 return timer_expired_ns(timer_head, current_time * timer_head->scale);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100474}
475
Alex Blighff83c662013-08-21 16:02:46 +0100476bool timerlist_run_timers(QEMUTimerList *timer_list)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100477{
Paolo Bonzini144b97c2012-09-19 15:52:44 +0200478 QEMUTimer *ts;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100479 int64_t current_time;
Alex Blighf9a976b2013-08-21 16:02:45 +0100480 bool progress = false;
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200481 QEMUTimerCB *cb;
482 void *opaque;
483
Liu Ping Fan3c053412013-09-25 14:21:00 +0800484 qemu_event_reset(&timer_list->timers_done_ev);
Pavel Dovgalyuk8bd7f712015-09-17 19:24:44 +0300485 if (!timer_list->clock->enabled || !timer_list->active_timers) {
Liu Ping Fan3c053412013-09-25 14:21:00 +0800486 goto out;
Alex Blighff83c662013-08-21 16:02:46 +0100487 }
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100488
Pavel Dovgalyuk8bd7f712015-09-17 19:24:44 +0300489 switch (timer_list->clock->type) {
490 case QEMU_CLOCK_REALTIME:
491 break;
492 default:
493 case QEMU_CLOCK_VIRTUAL:
494 if (!replay_checkpoint(CHECKPOINT_CLOCK_VIRTUAL)) {
495 goto out;
496 }
497 break;
498 case QEMU_CLOCK_HOST:
499 if (!replay_checkpoint(CHECKPOINT_CLOCK_HOST)) {
500 goto out;
501 }
502 break;
503 case QEMU_CLOCK_VIRTUAL_RT:
504 if (!replay_checkpoint(CHECKPOINT_CLOCK_VIRTUAL_RT)) {
505 goto out;
506 }
507 break;
508 }
509
Alex Bligh40daca52013-08-21 16:03:02 +0100510 current_time = qemu_clock_get_ns(timer_list->clock->type);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100511 for(;;) {
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200512 qemu_mutex_lock(&timer_list->active_timers_lock);
Alex Blighff83c662013-08-21 16:02:46 +0100513 ts = timer_list->active_timers;
Alex Blighe93379b2013-08-21 16:02:39 +0100514 if (!timer_expired_ns(ts, current_time)) {
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200515 qemu_mutex_unlock(&timer_list->active_timers_lock);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100516 break;
Stefan Weil45c7b372011-03-24 21:31:24 +0100517 }
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200518
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100519 /* remove timer from the list before calling the callback */
Alex Blighff83c662013-08-21 16:02:46 +0100520 timer_list->active_timers = ts->next;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100521 ts->next = NULL;
Paolo Bonzini3db1ee72013-09-12 11:02:20 +0200522 ts->expire_time = -1;
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200523 cb = ts->cb;
524 opaque = ts->opaque;
525 qemu_mutex_unlock(&timer_list->active_timers_lock);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100526
527 /* run the callback (the timer list can be modified) */
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200528 cb(opaque);
Alex Blighf9a976b2013-08-21 16:02:45 +0100529 progress = true;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100530 }
Liu Ping Fan3c053412013-09-25 14:21:00 +0800531
532out:
533 qemu_event_set(&timer_list->timers_done_ev);
Alex Blighf9a976b2013-08-21 16:02:45 +0100534 return progress;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100535}
536
Alex Bligh40daca52013-08-21 16:03:02 +0100537bool qemu_clock_run_timers(QEMUClockType type)
538{
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100539 return timerlist_run_timers(main_loop_tlg.tl[type]);
Alex Bligh40daca52013-08-21 16:03:02 +0100540}
541
Alex Blighd5541d82013-08-21 16:02:50 +0100542void timerlistgroup_init(QEMUTimerListGroup *tlg,
543 QEMUTimerListNotifyCB *cb, void *opaque)
Alex Bligh754d6a52013-08-21 16:02:48 +0100544{
545 QEMUClockType type;
546 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
Alex Blighd5541d82013-08-21 16:02:50 +0100547 tlg->tl[type] = timerlist_new(type, cb, opaque);
Alex Bligh754d6a52013-08-21 16:02:48 +0100548 }
549}
550
551void timerlistgroup_deinit(QEMUTimerListGroup *tlg)
552{
553 QEMUClockType type;
554 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
555 timerlist_free(tlg->tl[type]);
556 }
557}
558
559bool timerlistgroup_run_timers(QEMUTimerListGroup *tlg)
560{
561 QEMUClockType type;
562 bool progress = false;
563 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
564 progress |= timerlist_run_timers(tlg->tl[type]);
565 }
566 return progress;
567}
568
569int64_t timerlistgroup_deadline_ns(QEMUTimerListGroup *tlg)
570{
571 int64_t deadline = -1;
572 QEMUClockType type;
Pavel Dovgalyuk8bd7f712015-09-17 19:24:44 +0300573 bool play = replay_mode == REPLAY_MODE_PLAY;
Alex Bligh754d6a52013-08-21 16:02:48 +0100574 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
Pavel Dovgalyuk8bd7f712015-09-17 19:24:44 +0300575 if (qemu_clock_use_for_deadline(type)) {
576 if (!play || type == QEMU_CLOCK_REALTIME) {
577 deadline = qemu_soonest_timeout(deadline,
578 timerlist_deadline_ns(tlg->tl[type]));
579 } else {
580 /* Read clock from the replay file and
581 do not calculate the deadline, based on virtual clock. */
582 qemu_clock_get_ns(type);
583 }
Alex Bligh754d6a52013-08-21 16:02:48 +0100584 }
585 }
586 return deadline;
587}
588
Alex Bligh40daca52013-08-21 16:03:02 +0100589int64_t qemu_clock_get_ns(QEMUClockType type)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100590{
Jan Kiszka691a0c92011-06-20 14:06:27 +0200591 int64_t now, last;
Alex Bligh40daca52013-08-21 16:03:02 +0100592 QEMUClock *clock = qemu_clock_ptr(type);
Jan Kiszka691a0c92011-06-20 14:06:27 +0200593
Alex Bligh40daca52013-08-21 16:03:02 +0100594 switch (type) {
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100595 case QEMU_CLOCK_REALTIME:
596 return get_clock();
597 default:
598 case QEMU_CLOCK_VIRTUAL:
599 if (use_icount) {
600 return cpu_get_icount();
601 } else {
602 return cpu_get_clock();
603 }
604 case QEMU_CLOCK_HOST:
Pavel Dovgalyuk8eda2062015-09-17 19:24:28 +0300605 now = REPLAY_CLOCK(REPLAY_CLOCK_HOST, get_clock_realtime());
Jan Kiszka691a0c92011-06-20 14:06:27 +0200606 last = clock->last;
607 clock->last = now;
Pavel Dovgalyuk8bd7f712015-09-17 19:24:44 +0300608 if (now < last || now > (last + get_max_clock_jump())) {
Jan Kiszka691a0c92011-06-20 14:06:27 +0200609 notifier_list_notify(&clock->reset_notifiers, &now);
610 }
611 return now;
Pavel Dovgalyuk4e7fa732014-11-26 13:40:50 +0300612 case QEMU_CLOCK_VIRTUAL_RT:
Pavel Dovgalyuk8eda2062015-09-17 19:24:28 +0300613 return REPLAY_CLOCK(REPLAY_CLOCK_VIRTUAL_RT, cpu_get_clock());
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100614 }
615}
616
Alex Bligh40daca52013-08-21 16:03:02 +0100617void qemu_clock_register_reset_notifier(QEMUClockType type,
618 Notifier *notifier)
619{
620 QEMUClock *clock = qemu_clock_ptr(type);
Jan Kiszka691a0c92011-06-20 14:06:27 +0200621 notifier_list_add(&clock->reset_notifiers, notifier);
622}
623
Alex Bligh40daca52013-08-21 16:03:02 +0100624void qemu_clock_unregister_reset_notifier(QEMUClockType type,
625 Notifier *notifier)
Jan Kiszka691a0c92011-06-20 14:06:27 +0200626{
Paolo Bonzini31552522012-01-13 17:34:01 +0100627 notifier_remove(notifier);
Jan Kiszka691a0c92011-06-20 14:06:27 +0200628}
629
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100630void init_clocks(void)
631{
Alex Blighff83c662013-08-21 16:02:46 +0100632 QEMUClockType type;
633 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100634 qemu_clock_init(type);
Paolo Bonzini744ca8e2012-10-29 15:26:28 +0100635 }
Alex Blighff83c662013-08-21 16:02:46 +0100636
Alex Blighcd758dd2013-08-21 16:02:44 +0100637#ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK
638 prctl(PR_SET_TIMERSLACK, 1, 0, 0, 0);
639#endif
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100640}
641
Alex Blighe93379b2013-08-21 16:02:39 +0100642uint64_t timer_expire_time_ns(QEMUTimer *ts)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100643{
Alex Blighe93379b2013-08-21 16:02:39 +0100644 return timer_pending(ts) ? ts->expire_time : -1;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100645}
646
Alex Bligh40daca52013-08-21 16:03:02 +0100647bool qemu_clock_run_all_timers(void)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100648{
Alex Blighf9a976b2013-08-21 16:02:45 +0100649 bool progress = false;
Alex Blighff83c662013-08-21 16:02:46 +0100650 QEMUClockType type;
Alex Bligh6d327172013-08-21 16:02:59 +0100651
Alex Blighff83c662013-08-21 16:02:46 +0100652 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
Alex Bligh40daca52013-08-21 16:03:02 +0100653 progress |= qemu_clock_run_timers(type);
Alex Blighff83c662013-08-21 16:02:46 +0100654 }
Peter Portante158fd3c2012-04-05 11:00:45 -0400655
Alex Blighf9a976b2013-08-21 16:02:45 +0100656 return progress;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100657}