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db1a4972 PB |
1 | /* |
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 | ||
25 | #include "sysemu.h" | |
26 | #include "net.h" | |
27 | #include "monitor.h" | |
28 | #include "console.h" | |
29 | ||
30 | #include "hw/hw.h" | |
31 | ||
32 | #include <unistd.h> | |
33 | #include <fcntl.h> | |
34 | #include <time.h> | |
35 | #include <errno.h> | |
36 | #include <sys/time.h> | |
37 | #include <signal.h> | |
44459349 JL |
38 | #ifdef __FreeBSD__ |
39 | #include <sys/param.h> | |
40 | #endif | |
db1a4972 PB |
41 | |
42 | #ifdef __linux__ | |
43 | #include <sys/ioctl.h> | |
44 | #include <linux/rtc.h> | |
45 | /* For the benefit of older linux systems which don't supply it, | |
46 | we use a local copy of hpet.h. */ | |
47 | /* #include <linux/hpet.h> */ | |
48 | #include "hpet.h" | |
49 | #endif | |
50 | ||
51 | #ifdef _WIN32 | |
52 | #include <windows.h> | |
53 | #include <mmsystem.h> | |
54 | #endif | |
55 | ||
db1a4972 | 56 | #include "qemu-timer.h" |
db1a4972 PB |
57 | |
58 | /* Conversion factor from emulated instructions to virtual clock ticks. */ | |
29e922b6 | 59 | int icount_time_shift; |
db1a4972 PB |
60 | /* Arbitrarily pick 1MIPS as the minimum allowable speed. */ |
61 | #define MAX_ICOUNT_SHIFT 10 | |
62 | /* Compensate for varying guest execution speed. */ | |
29e922b6 | 63 | int64_t qemu_icount_bias; |
db1a4972 PB |
64 | static QEMUTimer *icount_rt_timer; |
65 | static QEMUTimer *icount_vm_timer; | |
66 | ||
db1a4972 PB |
67 | /***********************************************************/ |
68 | /* guest cycle counter */ | |
69 | ||
70 | typedef struct TimersState { | |
71 | int64_t cpu_ticks_prev; | |
72 | int64_t cpu_ticks_offset; | |
73 | int64_t cpu_clock_offset; | |
74 | int32_t cpu_ticks_enabled; | |
75 | int64_t dummy; | |
76 | } TimersState; | |
77 | ||
78 | TimersState timers_state; | |
79 | ||
80 | /* return the host CPU cycle counter and handle stop/restart */ | |
81 | int64_t cpu_get_ticks(void) | |
82 | { | |
83 | if (use_icount) { | |
84 | return cpu_get_icount(); | |
85 | } | |
86 | if (!timers_state.cpu_ticks_enabled) { | |
87 | return timers_state.cpu_ticks_offset; | |
88 | } else { | |
89 | int64_t ticks; | |
90 | ticks = cpu_get_real_ticks(); | |
91 | if (timers_state.cpu_ticks_prev > ticks) { | |
92 | /* Note: non increasing ticks may happen if the host uses | |
93 | software suspend */ | |
94 | timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks; | |
95 | } | |
96 | timers_state.cpu_ticks_prev = ticks; | |
97 | return ticks + timers_state.cpu_ticks_offset; | |
98 | } | |
99 | } | |
100 | ||
101 | /* return the host CPU monotonic timer and handle stop/restart */ | |
102 | static int64_t cpu_get_clock(void) | |
103 | { | |
104 | int64_t ti; | |
105 | if (!timers_state.cpu_ticks_enabled) { | |
106 | return timers_state.cpu_clock_offset; | |
107 | } else { | |
108 | ti = get_clock(); | |
109 | return ti + timers_state.cpu_clock_offset; | |
110 | } | |
111 | } | |
112 | ||
db1a4972 PB |
113 | static int64_t qemu_icount_delta(void) |
114 | { | |
c9f7383c | 115 | if (use_icount == 1) { |
db1a4972 PB |
116 | /* When not using an adaptive execution frequency |
117 | we tend to get badly out of sync with real time, | |
118 | so just delay for a reasonable amount of time. */ | |
119 | return 0; | |
120 | } else { | |
121 | return cpu_get_icount() - cpu_get_clock(); | |
122 | } | |
123 | } | |
db1a4972 PB |
124 | |
125 | /* enable cpu_get_ticks() */ | |
126 | void cpu_enable_ticks(void) | |
127 | { | |
128 | if (!timers_state.cpu_ticks_enabled) { | |
129 | timers_state.cpu_ticks_offset -= cpu_get_real_ticks(); | |
130 | timers_state.cpu_clock_offset -= get_clock(); | |
131 | timers_state.cpu_ticks_enabled = 1; | |
132 | } | |
133 | } | |
134 | ||
135 | /* disable cpu_get_ticks() : the clock is stopped. You must not call | |
136 | cpu_get_ticks() after that. */ | |
137 | void cpu_disable_ticks(void) | |
138 | { | |
139 | if (timers_state.cpu_ticks_enabled) { | |
140 | timers_state.cpu_ticks_offset = cpu_get_ticks(); | |
141 | timers_state.cpu_clock_offset = cpu_get_clock(); | |
142 | timers_state.cpu_ticks_enabled = 0; | |
143 | } | |
144 | } | |
145 | ||
146 | /***********************************************************/ | |
147 | /* timers */ | |
148 | ||
149 | #define QEMU_CLOCK_REALTIME 0 | |
150 | #define QEMU_CLOCK_VIRTUAL 1 | |
151 | #define QEMU_CLOCK_HOST 2 | |
152 | ||
153 | struct QEMUClock { | |
154 | int type; | |
155 | int enabled; | |
156 | /* XXX: add frequency */ | |
157 | }; | |
158 | ||
159 | struct QEMUTimer { | |
160 | QEMUClock *clock; | |
161 | int64_t expire_time; | |
162 | QEMUTimerCB *cb; | |
163 | void *opaque; | |
164 | struct QEMUTimer *next; | |
165 | }; | |
166 | ||
167 | struct qemu_alarm_timer { | |
168 | char const *name; | |
169 | int (*start)(struct qemu_alarm_timer *t); | |
170 | void (*stop)(struct qemu_alarm_timer *t); | |
171 | void (*rearm)(struct qemu_alarm_timer *t); | |
172 | void *priv; | |
173 | ||
174 | char expired; | |
175 | char pending; | |
176 | }; | |
177 | ||
178 | static struct qemu_alarm_timer *alarm_timer; | |
179 | ||
180 | int qemu_alarm_pending(void) | |
181 | { | |
182 | return alarm_timer->pending; | |
183 | } | |
184 | ||
185 | static inline int alarm_has_dynticks(struct qemu_alarm_timer *t) | |
186 | { | |
187 | return !!t->rearm; | |
188 | } | |
189 | ||
190 | static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t) | |
191 | { | |
192 | if (!alarm_has_dynticks(t)) | |
193 | return; | |
194 | ||
195 | t->rearm(t); | |
196 | } | |
197 | ||
9c13246a PB |
198 | /* TODO: MIN_TIMER_REARM_NS should be optimized */ |
199 | #define MIN_TIMER_REARM_NS 250000 | |
db1a4972 PB |
200 | |
201 | #ifdef _WIN32 | |
202 | ||
db1a4972 PB |
203 | static int win32_start_timer(struct qemu_alarm_timer *t); |
204 | static void win32_stop_timer(struct qemu_alarm_timer *t); | |
205 | static void win32_rearm_timer(struct qemu_alarm_timer *t); | |
206 | ||
207 | #else | |
208 | ||
209 | static int unix_start_timer(struct qemu_alarm_timer *t); | |
210 | static void unix_stop_timer(struct qemu_alarm_timer *t); | |
211 | ||
212 | #ifdef __linux__ | |
213 | ||
214 | static int dynticks_start_timer(struct qemu_alarm_timer *t); | |
215 | static void dynticks_stop_timer(struct qemu_alarm_timer *t); | |
216 | static void dynticks_rearm_timer(struct qemu_alarm_timer *t); | |
217 | ||
218 | static int hpet_start_timer(struct qemu_alarm_timer *t); | |
219 | static void hpet_stop_timer(struct qemu_alarm_timer *t); | |
220 | ||
221 | static int rtc_start_timer(struct qemu_alarm_timer *t); | |
222 | static void rtc_stop_timer(struct qemu_alarm_timer *t); | |
223 | ||
224 | #endif /* __linux__ */ | |
225 | ||
226 | #endif /* _WIN32 */ | |
227 | ||
228 | /* Correlation between real and virtual time is always going to be | |
229 | fairly approximate, so ignore small variation. | |
230 | When the guest is idle real and virtual time will be aligned in | |
231 | the IO wait loop. */ | |
232 | #define ICOUNT_WOBBLE (get_ticks_per_sec() / 10) | |
233 | ||
234 | static void icount_adjust(void) | |
235 | { | |
236 | int64_t cur_time; | |
237 | int64_t cur_icount; | |
238 | int64_t delta; | |
239 | static int64_t last_delta; | |
240 | /* If the VM is not running, then do nothing. */ | |
241 | if (!vm_running) | |
242 | return; | |
243 | ||
244 | cur_time = cpu_get_clock(); | |
245 | cur_icount = qemu_get_clock(vm_clock); | |
246 | delta = cur_icount - cur_time; | |
247 | /* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */ | |
248 | if (delta > 0 | |
249 | && last_delta + ICOUNT_WOBBLE < delta * 2 | |
250 | && icount_time_shift > 0) { | |
251 | /* The guest is getting too far ahead. Slow time down. */ | |
252 | icount_time_shift--; | |
253 | } | |
254 | if (delta < 0 | |
255 | && last_delta - ICOUNT_WOBBLE > delta * 2 | |
256 | && icount_time_shift < MAX_ICOUNT_SHIFT) { | |
257 | /* The guest is getting too far behind. Speed time up. */ | |
258 | icount_time_shift++; | |
259 | } | |
260 | last_delta = delta; | |
261 | qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift); | |
262 | } | |
263 | ||
264 | static void icount_adjust_rt(void * opaque) | |
265 | { | |
266 | qemu_mod_timer(icount_rt_timer, | |
267 | qemu_get_clock(rt_clock) + 1000); | |
268 | icount_adjust(); | |
269 | } | |
270 | ||
271 | static void icount_adjust_vm(void * opaque) | |
272 | { | |
273 | qemu_mod_timer(icount_vm_timer, | |
274 | qemu_get_clock(vm_clock) + get_ticks_per_sec() / 10); | |
275 | icount_adjust(); | |
276 | } | |
277 | ||
278 | int64_t qemu_icount_round(int64_t count) | |
279 | { | |
280 | return (count + (1 << icount_time_shift) - 1) >> icount_time_shift; | |
281 | } | |
282 | ||
283 | static struct qemu_alarm_timer alarm_timers[] = { | |
284 | #ifndef _WIN32 | |
285 | #ifdef __linux__ | |
286 | {"dynticks", dynticks_start_timer, | |
287 | dynticks_stop_timer, dynticks_rearm_timer, NULL}, | |
288 | /* HPET - if available - is preferred */ | |
289 | {"hpet", hpet_start_timer, hpet_stop_timer, NULL, NULL}, | |
290 | /* ...otherwise try RTC */ | |
291 | {"rtc", rtc_start_timer, rtc_stop_timer, NULL, NULL}, | |
292 | #endif | |
293 | {"unix", unix_start_timer, unix_stop_timer, NULL, NULL}, | |
294 | #else | |
295 | {"dynticks", win32_start_timer, | |
68c23e55 | 296 | win32_stop_timer, win32_rearm_timer, NULL}, |
db1a4972 | 297 | {"win32", win32_start_timer, |
68c23e55 | 298 | win32_stop_timer, NULL, NULL}, |
db1a4972 PB |
299 | #endif |
300 | {NULL, } | |
301 | }; | |
302 | ||
303 | static void show_available_alarms(void) | |
304 | { | |
305 | int i; | |
306 | ||
307 | printf("Available alarm timers, in order of precedence:\n"); | |
308 | for (i = 0; alarm_timers[i].name; i++) | |
309 | printf("%s\n", alarm_timers[i].name); | |
310 | } | |
311 | ||
312 | void configure_alarms(char const *opt) | |
313 | { | |
314 | int i; | |
315 | int cur = 0; | |
316 | int count = ARRAY_SIZE(alarm_timers) - 1; | |
317 | char *arg; | |
318 | char *name; | |
319 | struct qemu_alarm_timer tmp; | |
320 | ||
321 | if (!strcmp(opt, "?")) { | |
322 | show_available_alarms(); | |
323 | exit(0); | |
324 | } | |
325 | ||
326 | arg = qemu_strdup(opt); | |
327 | ||
328 | /* Reorder the array */ | |
329 | name = strtok(arg, ","); | |
330 | while (name) { | |
331 | for (i = 0; i < count && alarm_timers[i].name; i++) { | |
332 | if (!strcmp(alarm_timers[i].name, name)) | |
333 | break; | |
334 | } | |
335 | ||
336 | if (i == count) { | |
337 | fprintf(stderr, "Unknown clock %s\n", name); | |
338 | goto next; | |
339 | } | |
340 | ||
341 | if (i < cur) | |
342 | /* Ignore */ | |
343 | goto next; | |
344 | ||
345 | /* Swap */ | |
346 | tmp = alarm_timers[i]; | |
347 | alarm_timers[i] = alarm_timers[cur]; | |
348 | alarm_timers[cur] = tmp; | |
349 | ||
350 | cur++; | |
351 | next: | |
352 | name = strtok(NULL, ","); | |
353 | } | |
354 | ||
355 | qemu_free(arg); | |
356 | ||
357 | if (cur) { | |
358 | /* Disable remaining timers */ | |
359 | for (i = cur; i < count; i++) | |
360 | alarm_timers[i].name = NULL; | |
361 | } else { | |
362 | show_available_alarms(); | |
363 | exit(1); | |
364 | } | |
365 | } | |
366 | ||
367 | #define QEMU_NUM_CLOCKS 3 | |
368 | ||
369 | QEMUClock *rt_clock; | |
370 | QEMUClock *vm_clock; | |
371 | QEMUClock *host_clock; | |
372 | ||
373 | static QEMUTimer *active_timers[QEMU_NUM_CLOCKS]; | |
374 | ||
375 | static QEMUClock *qemu_new_clock(int type) | |
376 | { | |
377 | QEMUClock *clock; | |
378 | clock = qemu_mallocz(sizeof(QEMUClock)); | |
379 | clock->type = type; | |
380 | clock->enabled = 1; | |
381 | return clock; | |
382 | } | |
383 | ||
384 | void qemu_clock_enable(QEMUClock *clock, int enabled) | |
385 | { | |
386 | clock->enabled = enabled; | |
387 | } | |
388 | ||
389 | QEMUTimer *qemu_new_timer(QEMUClock *clock, QEMUTimerCB *cb, void *opaque) | |
390 | { | |
391 | QEMUTimer *ts; | |
392 | ||
393 | ts = qemu_mallocz(sizeof(QEMUTimer)); | |
394 | ts->clock = clock; | |
395 | ts->cb = cb; | |
396 | ts->opaque = opaque; | |
397 | return ts; | |
398 | } | |
399 | ||
400 | void qemu_free_timer(QEMUTimer *ts) | |
401 | { | |
402 | qemu_free(ts); | |
403 | } | |
404 | ||
405 | /* stop a timer, but do not dealloc it */ | |
406 | void qemu_del_timer(QEMUTimer *ts) | |
407 | { | |
408 | QEMUTimer **pt, *t; | |
409 | ||
410 | /* NOTE: this code must be signal safe because | |
411 | qemu_timer_expired() can be called from a signal. */ | |
412 | pt = &active_timers[ts->clock->type]; | |
413 | for(;;) { | |
414 | t = *pt; | |
415 | if (!t) | |
416 | break; | |
417 | if (t == ts) { | |
418 | *pt = t->next; | |
419 | break; | |
420 | } | |
421 | pt = &t->next; | |
422 | } | |
423 | } | |
424 | ||
425 | /* modify the current timer so that it will be fired when current_time | |
426 | >= expire_time. The corresponding callback will be called. */ | |
427 | void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time) | |
428 | { | |
429 | QEMUTimer **pt, *t; | |
430 | ||
431 | qemu_del_timer(ts); | |
432 | ||
433 | /* add the timer in the sorted list */ | |
434 | /* NOTE: this code must be signal safe because | |
435 | qemu_timer_expired() can be called from a signal. */ | |
436 | pt = &active_timers[ts->clock->type]; | |
437 | for(;;) { | |
438 | t = *pt; | |
439 | if (!t) | |
440 | break; | |
441 | if (t->expire_time > expire_time) | |
442 | break; | |
443 | pt = &t->next; | |
444 | } | |
445 | ts->expire_time = expire_time; | |
446 | ts->next = *pt; | |
447 | *pt = ts; | |
448 | ||
449 | /* Rearm if necessary */ | |
450 | if (pt == &active_timers[ts->clock->type]) { | |
451 | if (!alarm_timer->pending) { | |
452 | qemu_rearm_alarm_timer(alarm_timer); | |
453 | } | |
454 | /* Interrupt execution to force deadline recalculation. */ | |
455 | if (use_icount) | |
456 | qemu_notify_event(); | |
457 | } | |
458 | } | |
459 | ||
460 | int qemu_timer_pending(QEMUTimer *ts) | |
461 | { | |
462 | QEMUTimer *t; | |
463 | for(t = active_timers[ts->clock->type]; t != NULL; t = t->next) { | |
464 | if (t == ts) | |
465 | return 1; | |
466 | } | |
467 | return 0; | |
468 | } | |
469 | ||
470 | int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time) | |
471 | { | |
472 | if (!timer_head) | |
473 | return 0; | |
474 | return (timer_head->expire_time <= current_time); | |
475 | } | |
476 | ||
477 | static void qemu_run_timers(QEMUClock *clock) | |
478 | { | |
479 | QEMUTimer **ptimer_head, *ts; | |
480 | int64_t current_time; | |
481 | ||
482 | if (!clock->enabled) | |
483 | return; | |
484 | ||
485 | current_time = qemu_get_clock (clock); | |
486 | ptimer_head = &active_timers[clock->type]; | |
487 | for(;;) { | |
488 | ts = *ptimer_head; | |
489 | if (!ts || ts->expire_time > current_time) | |
490 | break; | |
491 | /* remove timer from the list before calling the callback */ | |
492 | *ptimer_head = ts->next; | |
493 | ts->next = NULL; | |
494 | ||
495 | /* run the callback (the timer list can be modified) */ | |
496 | ts->cb(ts->opaque); | |
497 | } | |
498 | } | |
499 | ||
500 | int64_t qemu_get_clock(QEMUClock *clock) | |
501 | { | |
502 | switch(clock->type) { | |
503 | case QEMU_CLOCK_REALTIME: | |
504 | return get_clock() / 1000000; | |
505 | default: | |
506 | case QEMU_CLOCK_VIRTUAL: | |
507 | if (use_icount) { | |
508 | return cpu_get_icount(); | |
509 | } else { | |
510 | return cpu_get_clock(); | |
511 | } | |
512 | case QEMU_CLOCK_HOST: | |
513 | return get_clock_realtime(); | |
514 | } | |
515 | } | |
516 | ||
517 | int64_t qemu_get_clock_ns(QEMUClock *clock) | |
518 | { | |
519 | switch(clock->type) { | |
520 | case QEMU_CLOCK_REALTIME: | |
521 | return get_clock(); | |
522 | default: | |
523 | case QEMU_CLOCK_VIRTUAL: | |
524 | if (use_icount) { | |
525 | return cpu_get_icount(); | |
526 | } else { | |
527 | return cpu_get_clock(); | |
528 | } | |
529 | case QEMU_CLOCK_HOST: | |
530 | return get_clock_realtime(); | |
531 | } | |
532 | } | |
533 | ||
534 | void init_clocks(void) | |
535 | { | |
db1a4972 PB |
536 | rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME); |
537 | vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL); | |
538 | host_clock = qemu_new_clock(QEMU_CLOCK_HOST); | |
539 | ||
540 | rtc_clock = host_clock; | |
541 | } | |
542 | ||
543 | /* save a timer */ | |
544 | void qemu_put_timer(QEMUFile *f, QEMUTimer *ts) | |
545 | { | |
546 | uint64_t expire_time; | |
547 | ||
548 | if (qemu_timer_pending(ts)) { | |
549 | expire_time = ts->expire_time; | |
550 | } else { | |
551 | expire_time = -1; | |
552 | } | |
553 | qemu_put_be64(f, expire_time); | |
554 | } | |
555 | ||
556 | void qemu_get_timer(QEMUFile *f, QEMUTimer *ts) | |
557 | { | |
558 | uint64_t expire_time; | |
559 | ||
560 | expire_time = qemu_get_be64(f); | |
561 | if (expire_time != -1) { | |
562 | qemu_mod_timer(ts, expire_time); | |
563 | } else { | |
564 | qemu_del_timer(ts); | |
565 | } | |
566 | } | |
567 | ||
568 | static const VMStateDescription vmstate_timers = { | |
569 | .name = "timer", | |
570 | .version_id = 2, | |
571 | .minimum_version_id = 1, | |
572 | .minimum_version_id_old = 1, | |
573 | .fields = (VMStateField []) { | |
574 | VMSTATE_INT64(cpu_ticks_offset, TimersState), | |
575 | VMSTATE_INT64(dummy, TimersState), | |
576 | VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2), | |
577 | VMSTATE_END_OF_LIST() | |
578 | } | |
579 | }; | |
580 | ||
581 | void configure_icount(const char *option) | |
582 | { | |
0be71e32 | 583 | vmstate_register(NULL, 0, &vmstate_timers, &timers_state); |
db1a4972 PB |
584 | if (!option) |
585 | return; | |
586 | ||
587 | if (strcmp(option, "auto") != 0) { | |
588 | icount_time_shift = strtol(option, NULL, 0); | |
589 | use_icount = 1; | |
590 | return; | |
591 | } | |
592 | ||
593 | use_icount = 2; | |
594 | ||
595 | /* 125MIPS seems a reasonable initial guess at the guest speed. | |
596 | It will be corrected fairly quickly anyway. */ | |
597 | icount_time_shift = 3; | |
598 | ||
599 | /* Have both realtime and virtual time triggers for speed adjustment. | |
600 | The realtime trigger catches emulated time passing too slowly, | |
601 | the virtual time trigger catches emulated time passing too fast. | |
602 | Realtime triggers occur even when idle, so use them less frequently | |
603 | than VM triggers. */ | |
604 | icount_rt_timer = qemu_new_timer(rt_clock, icount_adjust_rt, NULL); | |
605 | qemu_mod_timer(icount_rt_timer, | |
606 | qemu_get_clock(rt_clock) + 1000); | |
607 | icount_vm_timer = qemu_new_timer(vm_clock, icount_adjust_vm, NULL); | |
608 | qemu_mod_timer(icount_vm_timer, | |
609 | qemu_get_clock(vm_clock) + get_ticks_per_sec() / 10); | |
610 | } | |
611 | ||
612 | void qemu_run_all_timers(void) | |
613 | { | |
ca5a2a4b PB |
614 | alarm_timer->pending = 0; |
615 | ||
db1a4972 PB |
616 | /* rearm timer, if not periodic */ |
617 | if (alarm_timer->expired) { | |
618 | alarm_timer->expired = 0; | |
619 | qemu_rearm_alarm_timer(alarm_timer); | |
620 | } | |
621 | ||
db1a4972 PB |
622 | /* vm time timers */ |
623 | if (vm_running) { | |
624 | qemu_run_timers(vm_clock); | |
625 | } | |
626 | ||
627 | qemu_run_timers(rt_clock); | |
628 | qemu_run_timers(host_clock); | |
629 | } | |
630 | ||
4c3d45eb PB |
631 | static int64_t qemu_next_alarm_deadline(void); |
632 | ||
db1a4972 | 633 | #ifdef _WIN32 |
68c23e55 | 634 | static void CALLBACK host_alarm_handler(PVOID lpParam, BOOLEAN unused) |
db1a4972 PB |
635 | #else |
636 | static void host_alarm_handler(int host_signum) | |
637 | #endif | |
638 | { | |
639 | struct qemu_alarm_timer *t = alarm_timer; | |
640 | if (!t) | |
641 | return; | |
642 | ||
643 | #if 0 | |
644 | #define DISP_FREQ 1000 | |
645 | { | |
646 | static int64_t delta_min = INT64_MAX; | |
647 | static int64_t delta_max, delta_cum, last_clock, delta, ti; | |
648 | static int count; | |
649 | ti = qemu_get_clock(vm_clock); | |
650 | if (last_clock != 0) { | |
651 | delta = ti - last_clock; | |
652 | if (delta < delta_min) | |
653 | delta_min = delta; | |
654 | if (delta > delta_max) | |
655 | delta_max = delta; | |
656 | delta_cum += delta; | |
657 | if (++count == DISP_FREQ) { | |
658 | printf("timer: min=%" PRId64 " us max=%" PRId64 " us avg=%" PRId64 " us avg_freq=%0.3f Hz\n", | |
659 | muldiv64(delta_min, 1000000, get_ticks_per_sec()), | |
660 | muldiv64(delta_max, 1000000, get_ticks_per_sec()), | |
661 | muldiv64(delta_cum, 1000000 / DISP_FREQ, get_ticks_per_sec()), | |
662 | (double)get_ticks_per_sec() / ((double)delta_cum / DISP_FREQ)); | |
663 | count = 0; | |
664 | delta_min = INT64_MAX; | |
665 | delta_max = 0; | |
666 | delta_cum = 0; | |
667 | } | |
668 | } | |
669 | last_clock = ti; | |
670 | } | |
671 | #endif | |
672 | if (alarm_has_dynticks(t) || | |
4c3d45eb | 673 | qemu_next_alarm_deadline () <= 0) { |
db1a4972 PB |
674 | t->expired = alarm_has_dynticks(t); |
675 | t->pending = 1; | |
676 | qemu_notify_event(); | |
677 | } | |
678 | } | |
679 | ||
680 | int64_t qemu_next_deadline(void) | |
681 | { | |
682 | /* To avoid problems with overflow limit this to 2^32. */ | |
683 | int64_t delta = INT32_MAX; | |
684 | ||
685 | if (active_timers[QEMU_CLOCK_VIRTUAL]) { | |
686 | delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - | |
9c13246a | 687 | qemu_get_clock_ns(vm_clock); |
db1a4972 PB |
688 | } |
689 | if (active_timers[QEMU_CLOCK_HOST]) { | |
690 | int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - | |
9c13246a | 691 | qemu_get_clock_ns(host_clock); |
db1a4972 PB |
692 | if (hdelta < delta) |
693 | delta = hdelta; | |
694 | } | |
695 | ||
696 | if (delta < 0) | |
697 | delta = 0; | |
698 | ||
699 | return delta; | |
700 | } | |
701 | ||
4c3d45eb | 702 | static int64_t qemu_next_alarm_deadline(void) |
db1a4972 PB |
703 | { |
704 | int64_t delta; | |
705 | int64_t rtdelta; | |
706 | ||
6ad0a1ed PB |
707 | if (!use_icount && active_timers[QEMU_CLOCK_VIRTUAL]) { |
708 | delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - | |
709 | qemu_get_clock(vm_clock); | |
710 | } else { | |
db1a4972 | 711 | delta = INT32_MAX; |
6ad0a1ed PB |
712 | } |
713 | if (active_timers[QEMU_CLOCK_HOST]) { | |
714 | int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - | |
715 | qemu_get_clock_ns(host_clock); | |
716 | if (hdelta < delta) | |
717 | delta = hdelta; | |
718 | } | |
db1a4972 | 719 | if (active_timers[QEMU_CLOCK_REALTIME]) { |
9c13246a PB |
720 | rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time * 1000000 - |
721 | qemu_get_clock_ns(rt_clock)); | |
db1a4972 PB |
722 | if (rtdelta < delta) |
723 | delta = rtdelta; | |
724 | } | |
725 | ||
db1a4972 PB |
726 | return delta; |
727 | } | |
728 | ||
4c3d45eb PB |
729 | #if defined(__linux__) |
730 | ||
731 | #define RTC_FREQ 1024 | |
732 | ||
db1a4972 PB |
733 | static void enable_sigio_timer(int fd) |
734 | { | |
735 | struct sigaction act; | |
736 | ||
737 | /* timer signal */ | |
738 | sigfillset(&act.sa_mask); | |
739 | act.sa_flags = 0; | |
740 | act.sa_handler = host_alarm_handler; | |
741 | ||
742 | sigaction(SIGIO, &act, NULL); | |
743 | fcntl_setfl(fd, O_ASYNC); | |
744 | fcntl(fd, F_SETOWN, getpid()); | |
745 | } | |
746 | ||
747 | static int hpet_start_timer(struct qemu_alarm_timer *t) | |
748 | { | |
749 | struct hpet_info info; | |
750 | int r, fd; | |
751 | ||
752 | fd = qemu_open("/dev/hpet", O_RDONLY); | |
753 | if (fd < 0) | |
754 | return -1; | |
755 | ||
756 | /* Set frequency */ | |
757 | r = ioctl(fd, HPET_IRQFREQ, RTC_FREQ); | |
758 | if (r < 0) { | |
759 | fprintf(stderr, "Could not configure '/dev/hpet' to have a 1024Hz timer. This is not a fatal\n" | |
760 | "error, but for better emulation accuracy type:\n" | |
761 | "'echo 1024 > /proc/sys/dev/hpet/max-user-freq' as root.\n"); | |
762 | goto fail; | |
763 | } | |
764 | ||
765 | /* Check capabilities */ | |
766 | r = ioctl(fd, HPET_INFO, &info); | |
767 | if (r < 0) | |
768 | goto fail; | |
769 | ||
770 | /* Enable periodic mode */ | |
771 | r = ioctl(fd, HPET_EPI, 0); | |
772 | if (info.hi_flags && (r < 0)) | |
773 | goto fail; | |
774 | ||
775 | /* Enable interrupt */ | |
776 | r = ioctl(fd, HPET_IE_ON, 0); | |
777 | if (r < 0) | |
778 | goto fail; | |
779 | ||
780 | enable_sigio_timer(fd); | |
781 | t->priv = (void *)(long)fd; | |
782 | ||
783 | return 0; | |
784 | fail: | |
785 | close(fd); | |
786 | return -1; | |
787 | } | |
788 | ||
789 | static void hpet_stop_timer(struct qemu_alarm_timer *t) | |
790 | { | |
791 | int fd = (long)t->priv; | |
792 | ||
793 | close(fd); | |
794 | } | |
795 | ||
796 | static int rtc_start_timer(struct qemu_alarm_timer *t) | |
797 | { | |
798 | int rtc_fd; | |
799 | unsigned long current_rtc_freq = 0; | |
800 | ||
801 | TFR(rtc_fd = qemu_open("/dev/rtc", O_RDONLY)); | |
802 | if (rtc_fd < 0) | |
803 | return -1; | |
804 | ioctl(rtc_fd, RTC_IRQP_READ, ¤t_rtc_freq); | |
805 | if (current_rtc_freq != RTC_FREQ && | |
806 | ioctl(rtc_fd, RTC_IRQP_SET, RTC_FREQ) < 0) { | |
807 | fprintf(stderr, "Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal\n" | |
808 | "error, but for better emulation accuracy either use a 2.6 host Linux kernel or\n" | |
809 | "type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.\n"); | |
810 | goto fail; | |
811 | } | |
812 | if (ioctl(rtc_fd, RTC_PIE_ON, 0) < 0) { | |
813 | fail: | |
814 | close(rtc_fd); | |
815 | return -1; | |
816 | } | |
817 | ||
818 | enable_sigio_timer(rtc_fd); | |
819 | ||
820 | t->priv = (void *)(long)rtc_fd; | |
821 | ||
822 | return 0; | |
823 | } | |
824 | ||
825 | static void rtc_stop_timer(struct qemu_alarm_timer *t) | |
826 | { | |
827 | int rtc_fd = (long)t->priv; | |
828 | ||
829 | close(rtc_fd); | |
830 | } | |
831 | ||
832 | static int dynticks_start_timer(struct qemu_alarm_timer *t) | |
833 | { | |
834 | struct sigevent ev; | |
835 | timer_t host_timer; | |
836 | struct sigaction act; | |
837 | ||
838 | sigfillset(&act.sa_mask); | |
839 | act.sa_flags = 0; | |
840 | act.sa_handler = host_alarm_handler; | |
841 | ||
842 | sigaction(SIGALRM, &act, NULL); | |
843 | ||
844 | /* | |
845 | * Initialize ev struct to 0 to avoid valgrind complaining | |
846 | * about uninitialized data in timer_create call | |
847 | */ | |
848 | memset(&ev, 0, sizeof(ev)); | |
849 | ev.sigev_value.sival_int = 0; | |
850 | ev.sigev_notify = SIGEV_SIGNAL; | |
851 | ev.sigev_signo = SIGALRM; | |
852 | ||
853 | if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) { | |
854 | perror("timer_create"); | |
855 | ||
856 | /* disable dynticks */ | |
857 | fprintf(stderr, "Dynamic Ticks disabled\n"); | |
858 | ||
859 | return -1; | |
860 | } | |
861 | ||
862 | t->priv = (void *)(long)host_timer; | |
863 | ||
864 | return 0; | |
865 | } | |
866 | ||
867 | static void dynticks_stop_timer(struct qemu_alarm_timer *t) | |
868 | { | |
869 | timer_t host_timer = (timer_t)(long)t->priv; | |
870 | ||
871 | timer_delete(host_timer); | |
872 | } | |
873 | ||
874 | static void dynticks_rearm_timer(struct qemu_alarm_timer *t) | |
875 | { | |
876 | timer_t host_timer = (timer_t)(long)t->priv; | |
877 | struct itimerspec timeout; | |
9c13246a PB |
878 | int64_t nearest_delta_ns = INT64_MAX; |
879 | int64_t current_ns; | |
db1a4972 PB |
880 | |
881 | assert(alarm_has_dynticks(t)); | |
882 | if (!active_timers[QEMU_CLOCK_REALTIME] && | |
883 | !active_timers[QEMU_CLOCK_VIRTUAL] && | |
884 | !active_timers[QEMU_CLOCK_HOST]) | |
885 | return; | |
886 | ||
4c3d45eb PB |
887 | nearest_delta_ns = qemu_next_alarm_deadline(); |
888 | if (nearest_delta_ns < MIN_TIMER_REARM_NS) | |
889 | nearest_delta_ns = MIN_TIMER_REARM_NS; | |
db1a4972 PB |
890 | |
891 | /* check whether a timer is already running */ | |
892 | if (timer_gettime(host_timer, &timeout)) { | |
893 | perror("gettime"); | |
894 | fprintf(stderr, "Internal timer error: aborting\n"); | |
895 | exit(1); | |
896 | } | |
9c13246a PB |
897 | current_ns = timeout.it_value.tv_sec * 1000000000LL + timeout.it_value.tv_nsec; |
898 | if (current_ns && current_ns <= nearest_delta_ns) | |
db1a4972 PB |
899 | return; |
900 | ||
901 | timeout.it_interval.tv_sec = 0; | |
902 | timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */ | |
9c13246a PB |
903 | timeout.it_value.tv_sec = nearest_delta_ns / 1000000000; |
904 | timeout.it_value.tv_nsec = nearest_delta_ns % 1000000000; | |
db1a4972 PB |
905 | if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) { |
906 | perror("settime"); | |
907 | fprintf(stderr, "Internal timer error: aborting\n"); | |
908 | exit(1); | |
909 | } | |
910 | } | |
911 | ||
912 | #endif /* defined(__linux__) */ | |
913 | ||
f26e5a54 SW |
914 | #if !defined(_WIN32) |
915 | ||
db1a4972 PB |
916 | static int unix_start_timer(struct qemu_alarm_timer *t) |
917 | { | |
918 | struct sigaction act; | |
919 | struct itimerval itv; | |
920 | int err; | |
921 | ||
922 | /* timer signal */ | |
923 | sigfillset(&act.sa_mask); | |
924 | act.sa_flags = 0; | |
925 | act.sa_handler = host_alarm_handler; | |
926 | ||
927 | sigaction(SIGALRM, &act, NULL); | |
928 | ||
929 | itv.it_interval.tv_sec = 0; | |
930 | /* for i386 kernel 2.6 to get 1 ms */ | |
931 | itv.it_interval.tv_usec = 999; | |
932 | itv.it_value.tv_sec = 0; | |
933 | itv.it_value.tv_usec = 10 * 1000; | |
934 | ||
935 | err = setitimer(ITIMER_REAL, &itv, NULL); | |
936 | if (err) | |
937 | return -1; | |
938 | ||
939 | return 0; | |
940 | } | |
941 | ||
942 | static void unix_stop_timer(struct qemu_alarm_timer *t) | |
943 | { | |
944 | struct itimerval itv; | |
945 | ||
946 | memset(&itv, 0, sizeof(itv)); | |
947 | setitimer(ITIMER_REAL, &itv, NULL); | |
948 | } | |
949 | ||
950 | #endif /* !defined(_WIN32) */ | |
951 | ||
952 | ||
953 | #ifdef _WIN32 | |
954 | ||
955 | static int win32_start_timer(struct qemu_alarm_timer *t) | |
956 | { | |
68c23e55 PB |
957 | HANDLE hTimer; |
958 | BOOLEAN success; | |
959 | ||
960 | /* If you call ChangeTimerQueueTimer on a one-shot timer (its period | |
961 | is zero) that has already expired, the timer is not updated. Since | |
962 | creating a new timer is relatively expensive, set a bogus one-hour | |
963 | interval in the dynticks case. */ | |
964 | success = CreateTimerQueueTimer(&hTimer, | |
965 | NULL, | |
966 | host_alarm_handler, | |
967 | t, | |
968 | 1, | |
969 | alarm_has_dynticks(t) ? 3600000 : 1, | |
970 | WT_EXECUTEINTIMERTHREAD); | |
971 | ||
972 | if (!success) { | |
db1a4972 PB |
973 | fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n", |
974 | GetLastError()); | |
db1a4972 PB |
975 | return -1; |
976 | } | |
977 | ||
68c23e55 | 978 | t->priv = (PVOID) hTimer; |
db1a4972 PB |
979 | return 0; |
980 | } | |
981 | ||
982 | static void win32_stop_timer(struct qemu_alarm_timer *t) | |
983 | { | |
68c23e55 | 984 | HANDLE hTimer = t->priv; |
db1a4972 | 985 | |
68c23e55 PB |
986 | if (hTimer) { |
987 | DeleteTimerQueueTimer(NULL, hTimer, NULL); | |
988 | } | |
db1a4972 PB |
989 | } |
990 | ||
991 | static void win32_rearm_timer(struct qemu_alarm_timer *t) | |
992 | { | |
68c23e55 | 993 | HANDLE hTimer = t->priv; |
cfced5b2 | 994 | int nearest_delta_ms; |
68c23e55 | 995 | BOOLEAN success; |
db1a4972 PB |
996 | |
997 | assert(alarm_has_dynticks(t)); | |
998 | if (!active_timers[QEMU_CLOCK_REALTIME] && | |
999 | !active_timers[QEMU_CLOCK_VIRTUAL] && | |
1000 | !active_timers[QEMU_CLOCK_HOST]) | |
1001 | return; | |
1002 | ||
cfced5b2 PB |
1003 | nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000; |
1004 | if (nearest_delta_ms < 1) { | |
1005 | nearest_delta_ms = 1; | |
1006 | } | |
68c23e55 PB |
1007 | success = ChangeTimerQueueTimer(NULL, |
1008 | hTimer, | |
1009 | nearest_delta_ms, | |
1010 | 3600000); | |
db1a4972 | 1011 | |
68c23e55 PB |
1012 | if (!success) { |
1013 | fprintf(stderr, "Failed to rearm win32 alarm timer: %ld\n", | |
1014 | GetLastError()); | |
1015 | exit(-1); | |
db1a4972 | 1016 | } |
68c23e55 | 1017 | |
db1a4972 PB |
1018 | } |
1019 | ||
1020 | #endif /* _WIN32 */ | |
1021 | ||
1022 | static void alarm_timer_on_change_state_rearm(void *opaque, int running, int reason) | |
1023 | { | |
1024 | if (running) | |
1025 | qemu_rearm_alarm_timer((struct qemu_alarm_timer *) opaque); | |
1026 | } | |
1027 | ||
1028 | int init_timer_alarm(void) | |
1029 | { | |
1030 | struct qemu_alarm_timer *t = NULL; | |
1031 | int i, err = -1; | |
1032 | ||
1033 | for (i = 0; alarm_timers[i].name; i++) { | |
1034 | t = &alarm_timers[i]; | |
1035 | ||
1036 | err = t->start(t); | |
1037 | if (!err) | |
1038 | break; | |
1039 | } | |
1040 | ||
1041 | if (err) { | |
1042 | err = -ENOENT; | |
1043 | goto fail; | |
1044 | } | |
1045 | ||
1046 | /* first event is at time 0 */ | |
1047 | t->pending = 1; | |
1048 | alarm_timer = t; | |
1049 | qemu_add_vm_change_state_handler(alarm_timer_on_change_state_rearm, t); | |
1050 | ||
1051 | return 0; | |
1052 | ||
1053 | fail: | |
1054 | return err; | |
1055 | } | |
1056 | ||
1057 | void quit_timers(void) | |
1058 | { | |
1059 | struct qemu_alarm_timer *t = alarm_timer; | |
1060 | alarm_timer = NULL; | |
1061 | t->stop(t); | |
1062 | } | |
1063 | ||
1064 | int qemu_calculate_timeout(void) | |
1065 | { | |
db1a4972 | 1066 | int timeout; |
c9f7383c PB |
1067 | int64_t add; |
1068 | int64_t delta; | |
db1a4972 | 1069 | |
225d02cd EI |
1070 | /* When using icount, making forward progress with qemu_icount when the |
1071 | guest CPU is idle is critical. We only use the static io-thread timeout | |
1072 | for non icount runs. */ | |
c9f7383c PB |
1073 | if (!use_icount || !vm_running) { |
1074 | return 5000; | |
225d02cd | 1075 | } |
225d02cd | 1076 | |
c9f7383c PB |
1077 | /* Advance virtual time to the next event. */ |
1078 | delta = qemu_icount_delta(); | |
1079 | if (delta > 0) { | |
1080 | /* If virtual time is ahead of real time then just | |
1081 | wait for IO. */ | |
1082 | timeout = (delta + 999999) / 1000000; | |
1083 | } else { | |
1084 | /* Wait for either IO to occur or the next | |
1085 | timer event. */ | |
1086 | add = qemu_next_deadline(); | |
1087 | /* We advance the timer before checking for IO. | |
1088 | Limit the amount we advance so that early IO | |
1089 | activity won't get the guest too far ahead. */ | |
1090 | if (add > 10000000) | |
1091 | add = 10000000; | |
1092 | delta += add; | |
1093 | qemu_icount += qemu_icount_round (add); | |
1094 | timeout = delta / 1000000; | |
1095 | if (timeout < 0) | |
1096 | timeout = 0; | |
db1a4972 PB |
1097 | } |
1098 | ||
1099 | return timeout; | |
db1a4972 PB |
1100 | } |
1101 |