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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 Maydell1ac02062015-01-20 16:16:40 +000025#include "qemu/main-loop.h"
Paolo Bonzini1de7afc2012-12-17 18:20:00 +010026#include "qemu/timer.h"
Peter Maydell1ac02062015-01-20 16:16:40 +000027
Anthony Liguori30ea8332012-11-02 16:12:53 -050028#ifdef CONFIG_POSIX
29#include <pthread.h>
30#endif
Stefan Weilbff9f8b2012-04-20 10:27:06 +020031
Alex Bligh4e0c6522013-08-21 16:02:43 +010032#ifdef CONFIG_PPOLL
33#include <poll.h>
34#endif
35
Alex Blighcd758dd2013-08-21 16:02:44 +010036#ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK
37#include <sys/prctl.h>
38#endif
39
Paolo Bonzinidb1a4972010-03-10 11:38:55 +010040/***********************************************************/
41/* timers */
42
Alex Blighb4049b72013-08-21 16:03:09 +010043typedef struct QEMUClock {
Liu Ping Fan3c053412013-09-25 14:21:00 +080044 /* We rely on BQL to protect the timerlists */
Alex Blighff83c662013-08-21 16:02:46 +010045 QLIST_HEAD(, QEMUTimerList) timerlists;
Jan Kiszka691a0c92011-06-20 14:06:27 +020046
47 NotifierList reset_notifiers;
48 int64_t last;
Stefan Weil9a14b292012-04-20 11:51:58 +020049
Alex Blighff83c662013-08-21 16:02:46 +010050 QEMUClockType type;
Stefan Weil9a14b292012-04-20 11:51:58 +020051 bool enabled;
Alex Blighb4049b72013-08-21 16:03:09 +010052} QEMUClock;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +010053
Alex Bligh754d6a52013-08-21 16:02:48 +010054QEMUTimerListGroup main_loop_tlg;
Stefan Weilfbdb6642014-05-03 08:12:15 +020055static QEMUClock qemu_clocks[QEMU_CLOCK_MAX];
Alex Blighff83c662013-08-21 16:02:46 +010056
57/* A QEMUTimerList is a list of timers attached to a clock. More
58 * than one QEMUTimerList can be attached to each clock, for instance
59 * used by different AioContexts / threads. Each clock also has
60 * a list of the QEMUTimerLists associated with it, in order that
61 * reenabling the clock can call all the notifiers.
62 */
63
64struct QEMUTimerList {
Stefan Weil9a14b292012-04-20 11:51:58 +020065 QEMUClock *clock;
Stefan Hajnoczi978f2202013-09-12 11:02:19 +020066 QemuMutex active_timers_lock;
Alex Blighff83c662013-08-21 16:02:46 +010067 QEMUTimer *active_timers;
68 QLIST_ENTRY(QEMUTimerList) list;
Alex Blighd5541d82013-08-21 16:02:50 +010069 QEMUTimerListNotifyCB *notify_cb;
70 void *notify_opaque;
Liu Ping Fan3c053412013-09-25 14:21:00 +080071
72 /* lightweight method to mark the end of timerlist's running */
73 QemuEvent timers_done_ev;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +010074};
75
Alex Bligh7bf8fbd2013-08-21 16:03:03 +010076/**
77 * qemu_clock_ptr:
78 * @type: type of clock
79 *
80 * Translate a clock type into a pointer to QEMUClock object.
81 *
82 * Returns: a pointer to the QEMUClock object
83 */
Alex Blighb4049b72013-08-21 16:03:09 +010084static inline QEMUClock *qemu_clock_ptr(QEMUClockType type)
Alex Bligh7bf8fbd2013-08-21 16:03:03 +010085{
86 return &qemu_clocks[type];
87}
88
Alex Blighe93379b2013-08-21 16:02:39 +010089static bool timer_expired_ns(QEMUTimer *timer_head, int64_t current_time)
Stefan Weil45c7b372011-03-24 21:31:24 +010090{
91 return timer_head && (timer_head->expire_time <= current_time);
92}
93
Alex Bligh7bf8fbd2013-08-21 16:03:03 +010094QEMUTimerList *timerlist_new(QEMUClockType type,
95 QEMUTimerListNotifyCB *cb,
96 void *opaque)
Alex Blighff83c662013-08-21 16:02:46 +010097{
98 QEMUTimerList *timer_list;
Alex Bligh7bf8fbd2013-08-21 16:03:03 +010099 QEMUClock *clock = qemu_clock_ptr(type);
Alex Blighff83c662013-08-21 16:02:46 +0100100
101 timer_list = g_malloc0(sizeof(QEMUTimerList));
Paolo Bonzinie4efd8a2015-07-21 16:07:48 +0200102 qemu_event_init(&timer_list->timers_done_ev, true);
Alex Blighff83c662013-08-21 16:02:46 +0100103 timer_list->clock = clock;
Alex Blighd5541d82013-08-21 16:02:50 +0100104 timer_list->notify_cb = cb;
105 timer_list->notify_opaque = opaque;
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200106 qemu_mutex_init(&timer_list->active_timers_lock);
Alex Blighff83c662013-08-21 16:02:46 +0100107 QLIST_INSERT_HEAD(&clock->timerlists, timer_list, list);
108 return timer_list;
109}
110
Alex Blighff83c662013-08-21 16:02:46 +0100111void timerlist_free(QEMUTimerList *timer_list)
112{
113 assert(!timerlist_has_timers(timer_list));
114 if (timer_list->clock) {
115 QLIST_REMOVE(timer_list, list);
Alex Blighff83c662013-08-21 16:02:46 +0100116 }
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200117 qemu_mutex_destroy(&timer_list->active_timers_lock);
Alex Blighff83c662013-08-21 16:02:46 +0100118 g_free(timer_list);
119}
120
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100121static void qemu_clock_init(QEMUClockType type)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100122{
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100123 QEMUClock *clock = qemu_clock_ptr(type);
Jan Kiszka691a0c92011-06-20 14:06:27 +0200124
Kirill Batuzov02ce2322014-05-06 16:59:53 +0400125 /* Assert that the clock of type TYPE has not been initialized yet. */
126 assert(main_loop_tlg.tl[type] == NULL);
127
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100128 clock->type = type;
Stefan Weil5e1ec7b2012-04-20 10:45:48 +0200129 clock->enabled = true;
Paolo Bonzini2ff68d02011-09-12 16:21:44 +0200130 clock->last = INT64_MIN;
Alex Blighff83c662013-08-21 16:02:46 +0100131 QLIST_INIT(&clock->timerlists);
Jan Kiszka691a0c92011-06-20 14:06:27 +0200132 notifier_list_init(&clock->reset_notifiers);
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100133 main_loop_tlg.tl[type] = timerlist_new(type, NULL, NULL);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100134}
135
Alex Bligh40daca52013-08-21 16:03:02 +0100136bool qemu_clock_use_for_deadline(QEMUClockType type)
Alex Blighff83c662013-08-21 16:02:46 +0100137{
Alex Bligh40daca52013-08-21 16:03:02 +0100138 return !(use_icount && (type == QEMU_CLOCK_VIRTUAL));
Alex Blighff83c662013-08-21 16:02:46 +0100139}
140
Alex Bligh40daca52013-08-21 16:03:02 +0100141void qemu_clock_notify(QEMUClockType type)
Alex Blighb1bbfe72013-08-21 16:02:55 +0100142{
143 QEMUTimerList *timer_list;
Alex Bligh40daca52013-08-21 16:03:02 +0100144 QEMUClock *clock = qemu_clock_ptr(type);
Alex Blighb1bbfe72013-08-21 16:02:55 +0100145 QLIST_FOREACH(timer_list, &clock->timerlists, list) {
146 timerlist_notify(timer_list);
147 }
148}
149
Liu Ping Fan3c053412013-09-25 14:21:00 +0800150/* Disabling the clock will wait for related timerlists to stop
151 * executing qemu_run_timers. Thus, this functions should not
152 * be used from the callback of a timer that is based on @clock.
153 * Doing so would cause a deadlock.
154 *
155 * Caller should hold BQL.
156 */
Alex Bligh40daca52013-08-21 16:03:02 +0100157void qemu_clock_enable(QEMUClockType type, bool enabled)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100158{
Alex Bligh40daca52013-08-21 16:03:02 +0100159 QEMUClock *clock = qemu_clock_ptr(type);
Liu Ping Fan3c053412013-09-25 14:21:00 +0800160 QEMUTimerList *tl;
Paolo Bonzinifbdc14e2011-09-27 18:23:14 +0200161 bool old = clock->enabled;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100162 clock->enabled = enabled;
Paolo Bonzinifbdc14e2011-09-27 18:23:14 +0200163 if (enabled && !old) {
Alex Bligh40daca52013-08-21 16:03:02 +0100164 qemu_clock_notify(type);
Liu Ping Fan3c053412013-09-25 14:21:00 +0800165 } else if (!enabled && old) {
166 QLIST_FOREACH(tl, &clock->timerlists, list) {
167 qemu_event_wait(&tl->timers_done_ev);
168 }
Paolo Bonzinifbdc14e2011-09-27 18:23:14 +0200169 }
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100170}
171
Alex Blighff83c662013-08-21 16:02:46 +0100172bool timerlist_has_timers(QEMUTimerList *timer_list)
Paolo Bonzinidc2dfcf2011-09-12 15:50:16 +0200173{
Alex Blighff83c662013-08-21 16:02:46 +0100174 return !!timer_list->active_timers;
Paolo Bonzinidc2dfcf2011-09-12 15:50:16 +0200175}
176
Alex Bligh40daca52013-08-21 16:03:02 +0100177bool qemu_clock_has_timers(QEMUClockType type)
Paolo Bonzinidc2dfcf2011-09-12 15:50:16 +0200178{
Alex Bligh40daca52013-08-21 16:03:02 +0100179 return timerlist_has_timers(
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100180 main_loop_tlg.tl[type]);
Paolo Bonzinidc2dfcf2011-09-12 15:50:16 +0200181}
182
Alex Blighff83c662013-08-21 16:02:46 +0100183bool timerlist_expired(QEMUTimerList *timer_list)
184{
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200185 int64_t expire_time;
186
187 qemu_mutex_lock(&timer_list->active_timers_lock);
188 if (!timer_list->active_timers) {
189 qemu_mutex_unlock(&timer_list->active_timers_lock);
190 return false;
191 }
192 expire_time = timer_list->active_timers->expire_time;
193 qemu_mutex_unlock(&timer_list->active_timers_lock);
194
195 return expire_time < qemu_clock_get_ns(timer_list->clock->type);
Alex Blighff83c662013-08-21 16:02:46 +0100196}
197
Alex Bligh40daca52013-08-21 16:03:02 +0100198bool qemu_clock_expired(QEMUClockType type)
Alex Blighff83c662013-08-21 16:02:46 +0100199{
Alex Bligh40daca52013-08-21 16:03:02 +0100200 return timerlist_expired(
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100201 main_loop_tlg.tl[type]);
Alex Blighff83c662013-08-21 16:02:46 +0100202}
203
Alex Bligh02a03a92013-08-21 16:02:41 +0100204/*
205 * As above, but return -1 for no deadline, and do not cap to 2^32
206 * as we know the result is always positive.
207 */
208
Alex Blighff83c662013-08-21 16:02:46 +0100209int64_t timerlist_deadline_ns(QEMUTimerList *timer_list)
Alex Bligh02a03a92013-08-21 16:02:41 +0100210{
211 int64_t delta;
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200212 int64_t expire_time;
Alex Bligh02a03a92013-08-21 16:02:41 +0100213
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200214 if (!timer_list->clock->enabled) {
Alex Bligh02a03a92013-08-21 16:02:41 +0100215 return -1;
216 }
217
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200218 /* The active timers list may be modified before the caller uses our return
219 * value but ->notify_cb() is called when the deadline changes. Therefore
220 * the caller should notice the change and there is no race condition.
221 */
222 qemu_mutex_lock(&timer_list->active_timers_lock);
223 if (!timer_list->active_timers) {
224 qemu_mutex_unlock(&timer_list->active_timers_lock);
225 return -1;
226 }
227 expire_time = timer_list->active_timers->expire_time;
228 qemu_mutex_unlock(&timer_list->active_timers_lock);
229
230 delta = expire_time - qemu_clock_get_ns(timer_list->clock->type);
Alex Bligh02a03a92013-08-21 16:02:41 +0100231
232 if (delta <= 0) {
233 return 0;
234 }
235
236 return delta;
237}
238
Alex Blighac70aaf2013-08-21 16:02:57 +0100239/* Calculate the soonest deadline across all timerlists attached
240 * to the clock. This is used for the icount timeout so we
241 * ignore whether or not the clock should be used in deadline
242 * calculations.
243 */
Alex Bligh40daca52013-08-21 16:03:02 +0100244int64_t qemu_clock_deadline_ns_all(QEMUClockType type)
Alex Blighac70aaf2013-08-21 16:02:57 +0100245{
246 int64_t deadline = -1;
247 QEMUTimerList *timer_list;
Alex Bligh40daca52013-08-21 16:03:02 +0100248 QEMUClock *clock = qemu_clock_ptr(type);
Alex Blighac70aaf2013-08-21 16:02:57 +0100249 QLIST_FOREACH(timer_list, &clock->timerlists, list) {
250 deadline = qemu_soonest_timeout(deadline,
251 timerlist_deadline_ns(timer_list));
252 }
253 return deadline;
254}
255
Alex Bligh40daca52013-08-21 16:03:02 +0100256QEMUClockType timerlist_get_clock(QEMUTimerList *timer_list)
Alex Blighff83c662013-08-21 16:02:46 +0100257{
Alex Bligh40daca52013-08-21 16:03:02 +0100258 return timer_list->clock->type;
Alex Blighff83c662013-08-21 16:02:46 +0100259}
260
Alex Bligh40daca52013-08-21 16:03:02 +0100261QEMUTimerList *qemu_clock_get_main_loop_timerlist(QEMUClockType type)
Alex Blighff83c662013-08-21 16:02:46 +0100262{
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100263 return main_loop_tlg.tl[type];
Alex Blighff83c662013-08-21 16:02:46 +0100264}
265
Alex Blighd5541d82013-08-21 16:02:50 +0100266void timerlist_notify(QEMUTimerList *timer_list)
267{
268 if (timer_list->notify_cb) {
269 timer_list->notify_cb(timer_list->notify_opaque);
270 } else {
271 qemu_notify_event();
272 }
273}
274
Alex Bligh02a03a92013-08-21 16:02:41 +0100275/* Transition function to convert a nanosecond timeout to ms
276 * This is used where a system does not support ppoll
277 */
278int qemu_timeout_ns_to_ms(int64_t ns)
279{
280 int64_t ms;
281 if (ns < 0) {
282 return -1;
283 }
284
285 if (!ns) {
286 return 0;
287 }
288
289 /* Always round up, because it's better to wait too long than to wait too
290 * little and effectively busy-wait
291 */
292 ms = (ns + SCALE_MS - 1) / SCALE_MS;
293
294 /* To avoid overflow problems, limit this to 2^31, i.e. approx 25 days */
295 if (ms > (int64_t) INT32_MAX) {
296 ms = INT32_MAX;
297 }
298
299 return (int) ms;
300}
301
302
Alex Bligh4e0c6522013-08-21 16:02:43 +0100303/* qemu implementation of g_poll which uses a nanosecond timeout but is
304 * otherwise identical to g_poll
305 */
306int qemu_poll_ns(GPollFD *fds, guint nfds, int64_t timeout)
307{
308#ifdef CONFIG_PPOLL
309 if (timeout < 0) {
310 return ppoll((struct pollfd *)fds, nfds, NULL, NULL);
311 } else {
312 struct timespec ts;
Peter Maydell490309f2014-11-25 18:21:45 +0000313 int64_t tvsec = timeout / 1000000000LL;
314 /* Avoid possibly overflowing and specifying a negative number of
315 * seconds, which would turn a very long timeout into a busy-wait.
316 */
317 if (tvsec > (int64_t)INT32_MAX) {
318 tvsec = INT32_MAX;
319 }
320 ts.tv_sec = tvsec;
Alex Bligh4e0c6522013-08-21 16:02:43 +0100321 ts.tv_nsec = timeout % 1000000000LL;
322 return ppoll((struct pollfd *)fds, nfds, &ts, NULL);
323 }
324#else
325 return g_poll(fds, nfds, qemu_timeout_ns_to_ms(timeout));
326#endif
327}
328
329
Paolo Bonzinif186aa92014-12-23 21:54:14 +0100330void timer_init_tl(QEMUTimer *ts,
331 QEMUTimerList *timer_list, int scale,
332 QEMUTimerCB *cb, void *opaque)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100333{
Alex Blighff83c662013-08-21 16:02:46 +0100334 ts->timer_list = timer_list;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100335 ts->cb = cb;
336 ts->opaque = opaque;
Paolo Bonzini4a998742011-03-11 16:33:58 +0100337 ts->scale = scale;
Paolo Bonzini3db1ee72013-09-12 11:02:20 +0200338 ts->expire_time = -1;
Alex Blighff83c662013-08-21 16:02:46 +0100339}
340
Paolo Bonzinicd1bd532014-12-24 10:57:04 +0100341void timer_deinit(QEMUTimer *ts)
342{
343 assert(ts->expire_time == -1);
344 ts->timer_list = NULL;
345}
346
Alex Bligh40daca52013-08-21 16:03:02 +0100347void timer_free(QEMUTimer *ts)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100348{
Anthony Liguori7267c092011-08-20 22:09:37 -0500349 g_free(ts);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100350}
351
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200352static void timer_del_locked(QEMUTimerList *timer_list, QEMUTimer *ts)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100353{
354 QEMUTimer **pt, *t;
355
Paolo Bonzini3db1ee72013-09-12 11:02:20 +0200356 ts->expire_time = -1;
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200357 pt = &timer_list->active_timers;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100358 for(;;) {
359 t = *pt;
360 if (!t)
361 break;
362 if (t == ts) {
363 *pt = t->next;
364 break;
365 }
366 pt = &t->next;
367 }
368}
369
Paolo Bonzini0f809e52013-10-03 15:06:39 +0200370static bool timer_mod_ns_locked(QEMUTimerList *timer_list,
371 QEMUTimer *ts, int64_t expire_time)
372{
373 QEMUTimer **pt, *t;
374
375 /* add the timer in the sorted list */
376 pt = &timer_list->active_timers;
377 for (;;) {
378 t = *pt;
379 if (!timer_expired_ns(t, expire_time)) {
380 break;
381 }
382 pt = &t->next;
383 }
384 ts->expire_time = MAX(expire_time, 0);
385 ts->next = *pt;
386 *pt = ts;
387
388 return pt == &timer_list->active_timers;
389}
390
391static void timerlist_rearm(QEMUTimerList *timer_list)
392{
393 /* Interrupt execution to force deadline recalculation. */
394 qemu_clock_warp(timer_list->clock->type);
395 timerlist_notify(timer_list);
396}
397
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200398/* stop a timer, but do not dealloc it */
399void timer_del(QEMUTimer *ts)
400{
401 QEMUTimerList *timer_list = ts->timer_list;
402
Paolo Bonzinicd1bd532014-12-24 10:57:04 +0100403 if (timer_list) {
404 qemu_mutex_lock(&timer_list->active_timers_lock);
405 timer_del_locked(timer_list, ts);
406 qemu_mutex_unlock(&timer_list->active_timers_lock);
407 }
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200408}
409
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100410/* modify the current timer so that it will be fired when current_time
411 >= expire_time. The corresponding callback will be called. */
Alex Bligh40daca52013-08-21 16:03:02 +0100412void timer_mod_ns(QEMUTimer *ts, int64_t expire_time)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100413{
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200414 QEMUTimerList *timer_list = ts->timer_list;
Paolo Bonzini0f809e52013-10-03 15:06:39 +0200415 bool rearm;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100416
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200417 qemu_mutex_lock(&timer_list->active_timers_lock);
418 timer_del_locked(timer_list, ts);
Paolo Bonzini0f809e52013-10-03 15:06:39 +0200419 rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200420 qemu_mutex_unlock(&timer_list->active_timers_lock);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100421
Paolo Bonzini0f809e52013-10-03 15:06:39 +0200422 if (rearm) {
423 timerlist_rearm(timer_list);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100424 }
425}
426
Paolo Bonziniadd40e92013-10-03 15:11:43 +0200427/* modify the current timer so that it will be fired when current_time
428 >= expire_time or the current deadline, whichever comes earlier.
429 The corresponding callback will be called. */
430void timer_mod_anticipate_ns(QEMUTimer *ts, int64_t expire_time)
431{
432 QEMUTimerList *timer_list = ts->timer_list;
433 bool rearm;
434
435 qemu_mutex_lock(&timer_list->active_timers_lock);
436 if (ts->expire_time == -1 || ts->expire_time > expire_time) {
437 if (ts->expire_time != -1) {
438 timer_del_locked(timer_list, ts);
439 }
440 rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
441 } else {
442 rearm = false;
443 }
444 qemu_mutex_unlock(&timer_list->active_timers_lock);
445
446 if (rearm) {
447 timerlist_rearm(timer_list);
448 }
449}
450
Alex Bligh40daca52013-08-21 16:03:02 +0100451void timer_mod(QEMUTimer *ts, int64_t expire_time)
Paolo Bonzini4a998742011-03-11 16:33:58 +0100452{
Alex Bligh40daca52013-08-21 16:03:02 +0100453 timer_mod_ns(ts, expire_time * ts->scale);
Paolo Bonzini4a998742011-03-11 16:33:58 +0100454}
455
Paolo Bonziniadd40e92013-10-03 15:11:43 +0200456void timer_mod_anticipate(QEMUTimer *ts, int64_t expire_time)
457{
458 timer_mod_anticipate_ns(ts, expire_time * ts->scale);
459}
460
Alex Blighe93379b2013-08-21 16:02:39 +0100461bool timer_pending(QEMUTimer *ts)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100462{
Paolo Bonzini3db1ee72013-09-12 11:02:20 +0200463 return ts->expire_time >= 0;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100464}
465
Alex Blighe93379b2013-08-21 16:02:39 +0100466bool timer_expired(QEMUTimer *timer_head, int64_t current_time)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100467{
Alex Blighe93379b2013-08-21 16:02:39 +0100468 return timer_expired_ns(timer_head, current_time * timer_head->scale);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100469}
470
Alex Blighff83c662013-08-21 16:02:46 +0100471bool timerlist_run_timers(QEMUTimerList *timer_list)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100472{
Paolo Bonzini144b97c2012-09-19 15:52:44 +0200473 QEMUTimer *ts;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100474 int64_t current_time;
Alex Blighf9a976b2013-08-21 16:02:45 +0100475 bool progress = false;
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200476 QEMUTimerCB *cb;
477 void *opaque;
478
Liu Ping Fan3c053412013-09-25 14:21:00 +0800479 qemu_event_reset(&timer_list->timers_done_ev);
Alex Blighff83c662013-08-21 16:02:46 +0100480 if (!timer_list->clock->enabled) {
Liu Ping Fan3c053412013-09-25 14:21:00 +0800481 goto out;
Alex Blighff83c662013-08-21 16:02:46 +0100482 }
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100483
Alex Bligh40daca52013-08-21 16:03:02 +0100484 current_time = qemu_clock_get_ns(timer_list->clock->type);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100485 for(;;) {
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200486 qemu_mutex_lock(&timer_list->active_timers_lock);
Alex Blighff83c662013-08-21 16:02:46 +0100487 ts = timer_list->active_timers;
Alex Blighe93379b2013-08-21 16:02:39 +0100488 if (!timer_expired_ns(ts, current_time)) {
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200489 qemu_mutex_unlock(&timer_list->active_timers_lock);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100490 break;
Stefan Weil45c7b372011-03-24 21:31:24 +0100491 }
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200492
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100493 /* remove timer from the list before calling the callback */
Alex Blighff83c662013-08-21 16:02:46 +0100494 timer_list->active_timers = ts->next;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100495 ts->next = NULL;
Paolo Bonzini3db1ee72013-09-12 11:02:20 +0200496 ts->expire_time = -1;
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200497 cb = ts->cb;
498 opaque = ts->opaque;
499 qemu_mutex_unlock(&timer_list->active_timers_lock);
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100500
501 /* run the callback (the timer list can be modified) */
Stefan Hajnoczi978f2202013-09-12 11:02:19 +0200502 cb(opaque);
Alex Blighf9a976b2013-08-21 16:02:45 +0100503 progress = true;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100504 }
Liu Ping Fan3c053412013-09-25 14:21:00 +0800505
506out:
507 qemu_event_set(&timer_list->timers_done_ev);
Alex Blighf9a976b2013-08-21 16:02:45 +0100508 return progress;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100509}
510
Alex Bligh40daca52013-08-21 16:03:02 +0100511bool qemu_clock_run_timers(QEMUClockType type)
512{
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100513 return timerlist_run_timers(main_loop_tlg.tl[type]);
Alex Bligh40daca52013-08-21 16:03:02 +0100514}
515
Alex Blighd5541d82013-08-21 16:02:50 +0100516void timerlistgroup_init(QEMUTimerListGroup *tlg,
517 QEMUTimerListNotifyCB *cb, void *opaque)
Alex Bligh754d6a52013-08-21 16:02:48 +0100518{
519 QEMUClockType type;
520 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
Alex Blighd5541d82013-08-21 16:02:50 +0100521 tlg->tl[type] = timerlist_new(type, cb, opaque);
Alex Bligh754d6a52013-08-21 16:02:48 +0100522 }
523}
524
525void timerlistgroup_deinit(QEMUTimerListGroup *tlg)
526{
527 QEMUClockType type;
528 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
529 timerlist_free(tlg->tl[type]);
530 }
531}
532
533bool timerlistgroup_run_timers(QEMUTimerListGroup *tlg)
534{
535 QEMUClockType type;
536 bool progress = false;
537 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
538 progress |= timerlist_run_timers(tlg->tl[type]);
539 }
540 return progress;
541}
542
543int64_t timerlistgroup_deadline_ns(QEMUTimerListGroup *tlg)
544{
545 int64_t deadline = -1;
546 QEMUClockType type;
547 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
Alex Bligh40daca52013-08-21 16:03:02 +0100548 if (qemu_clock_use_for_deadline(tlg->tl[type]->clock->type)) {
Alex Bligh754d6a52013-08-21 16:02:48 +0100549 deadline = qemu_soonest_timeout(deadline,
550 timerlist_deadline_ns(
551 tlg->tl[type]));
552 }
553 }
554 return deadline;
555}
556
Alex Bligh40daca52013-08-21 16:03:02 +0100557int64_t qemu_clock_get_ns(QEMUClockType type)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100558{
Jan Kiszka691a0c92011-06-20 14:06:27 +0200559 int64_t now, last;
Alex Bligh40daca52013-08-21 16:03:02 +0100560 QEMUClock *clock = qemu_clock_ptr(type);
Jan Kiszka691a0c92011-06-20 14:06:27 +0200561
Alex Bligh40daca52013-08-21 16:03:02 +0100562 switch (type) {
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100563 case QEMU_CLOCK_REALTIME:
564 return get_clock();
565 default:
566 case QEMU_CLOCK_VIRTUAL:
567 if (use_icount) {
568 return cpu_get_icount();
569 } else {
570 return cpu_get_clock();
571 }
572 case QEMU_CLOCK_HOST:
Jan Kiszka691a0c92011-06-20 14:06:27 +0200573 now = get_clock_realtime();
574 last = clock->last;
575 clock->last = now;
Paul Donohuefb1a3a02015-06-12 10:08:45 -0400576 if (now < last || now > (last + get_max_clock_jump())) {
Jan Kiszka691a0c92011-06-20 14:06:27 +0200577 notifier_list_notify(&clock->reset_notifiers, &now);
578 }
579 return now;
Pavel Dovgalyuk4e7fa732014-11-26 13:40:50 +0300580 case QEMU_CLOCK_VIRTUAL_RT:
581 return cpu_get_clock();
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100582 }
583}
584
Alex Bligh40daca52013-08-21 16:03:02 +0100585void qemu_clock_register_reset_notifier(QEMUClockType type,
586 Notifier *notifier)
587{
588 QEMUClock *clock = qemu_clock_ptr(type);
Jan Kiszka691a0c92011-06-20 14:06:27 +0200589 notifier_list_add(&clock->reset_notifiers, notifier);
590}
591
Alex Bligh40daca52013-08-21 16:03:02 +0100592void qemu_clock_unregister_reset_notifier(QEMUClockType type,
593 Notifier *notifier)
Jan Kiszka691a0c92011-06-20 14:06:27 +0200594{
Paolo Bonzini31552522012-01-13 17:34:01 +0100595 notifier_remove(notifier);
Jan Kiszka691a0c92011-06-20 14:06:27 +0200596}
597
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100598void init_clocks(void)
599{
Alex Blighff83c662013-08-21 16:02:46 +0100600 QEMUClockType type;
601 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
Alex Bligh7bf8fbd2013-08-21 16:03:03 +0100602 qemu_clock_init(type);
Paolo Bonzini744ca8e2012-10-29 15:26:28 +0100603 }
Alex Blighff83c662013-08-21 16:02:46 +0100604
Alex Blighcd758dd2013-08-21 16:02:44 +0100605#ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK
606 prctl(PR_SET_TIMERSLACK, 1, 0, 0, 0);
607#endif
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100608}
609
Alex Blighe93379b2013-08-21 16:02:39 +0100610uint64_t timer_expire_time_ns(QEMUTimer *ts)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100611{
Alex Blighe93379b2013-08-21 16:02:39 +0100612 return timer_pending(ts) ? ts->expire_time : -1;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100613}
614
Alex Bligh40daca52013-08-21 16:03:02 +0100615bool qemu_clock_run_all_timers(void)
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100616{
Alex Blighf9a976b2013-08-21 16:02:45 +0100617 bool progress = false;
Alex Blighff83c662013-08-21 16:02:46 +0100618 QEMUClockType type;
Alex Bligh6d327172013-08-21 16:02:59 +0100619
Alex Blighff83c662013-08-21 16:02:46 +0100620 for (type = 0; type < QEMU_CLOCK_MAX; type++) {
Alex Bligh40daca52013-08-21 16:03:02 +0100621 progress |= qemu_clock_run_timers(type);
Alex Blighff83c662013-08-21 16:02:46 +0100622 }
Peter Portante158fd3c2012-04-05 11:00:45 -0400623
Alex Blighf9a976b2013-08-21 16:02:45 +0100624 return progress;
Paolo Bonzinidb1a4972010-03-10 11:38:55 +0100625}