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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; | |
db1a4972 PB |
156 | }; |
157 | ||
158 | struct QEMUTimer { | |
159 | QEMUClock *clock; | |
4a998740 PB |
160 | int64_t expire_time; /* in nanoseconds */ |
161 | int scale; | |
db1a4972 PB |
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(); | |
74475455 | 245 | cur_icount = qemu_get_clock_ns(vm_clock); |
db1a4972 PB |
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, | |
7bd427d8 | 267 | qemu_get_clock_ms(rt_clock) + 1000); |
db1a4972 PB |
268 | icount_adjust(); |
269 | } | |
270 | ||
271 | static void icount_adjust_vm(void * opaque) | |
272 | { | |
273 | qemu_mod_timer(icount_vm_timer, | |
74475455 | 274 | qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10); |
db1a4972 PB |
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 | ||
4a998740 PB |
389 | QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale, |
390 | QEMUTimerCB *cb, void *opaque) | |
db1a4972 PB |
391 | { |
392 | QEMUTimer *ts; | |
393 | ||
394 | ts = qemu_mallocz(sizeof(QEMUTimer)); | |
395 | ts->clock = clock; | |
396 | ts->cb = cb; | |
397 | ts->opaque = opaque; | |
4a998740 | 398 | ts->scale = scale; |
db1a4972 PB |
399 | return ts; |
400 | } | |
401 | ||
402 | void qemu_free_timer(QEMUTimer *ts) | |
403 | { | |
404 | qemu_free(ts); | |
405 | } | |
406 | ||
407 | /* stop a timer, but do not dealloc it */ | |
408 | void qemu_del_timer(QEMUTimer *ts) | |
409 | { | |
410 | QEMUTimer **pt, *t; | |
411 | ||
412 | /* NOTE: this code must be signal safe because | |
413 | qemu_timer_expired() can be called from a signal. */ | |
414 | pt = &active_timers[ts->clock->type]; | |
415 | for(;;) { | |
416 | t = *pt; | |
417 | if (!t) | |
418 | break; | |
419 | if (t == ts) { | |
420 | *pt = t->next; | |
421 | break; | |
422 | } | |
423 | pt = &t->next; | |
424 | } | |
425 | } | |
426 | ||
427 | /* modify the current timer so that it will be fired when current_time | |
428 | >= expire_time. The corresponding callback will be called. */ | |
4a998740 | 429 | static void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time) |
db1a4972 PB |
430 | { |
431 | QEMUTimer **pt, *t; | |
432 | ||
433 | qemu_del_timer(ts); | |
434 | ||
435 | /* add the timer in the sorted list */ | |
436 | /* NOTE: this code must be signal safe because | |
437 | qemu_timer_expired() can be called from a signal. */ | |
438 | pt = &active_timers[ts->clock->type]; | |
439 | for(;;) { | |
440 | t = *pt; | |
441 | if (!t) | |
442 | break; | |
443 | if (t->expire_time > expire_time) | |
444 | break; | |
445 | pt = &t->next; | |
446 | } | |
447 | ts->expire_time = expire_time; | |
448 | ts->next = *pt; | |
449 | *pt = ts; | |
450 | ||
451 | /* Rearm if necessary */ | |
452 | if (pt == &active_timers[ts->clock->type]) { | |
453 | if (!alarm_timer->pending) { | |
454 | qemu_rearm_alarm_timer(alarm_timer); | |
455 | } | |
456 | /* Interrupt execution to force deadline recalculation. */ | |
457 | if (use_icount) | |
458 | qemu_notify_event(); | |
459 | } | |
460 | } | |
461 | ||
4a998740 PB |
462 | /* modify the current timer so that it will be fired when current_time |
463 | >= expire_time. The corresponding callback will be called. */ | |
464 | void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time) | |
465 | { | |
466 | qemu_mod_timer_ns(ts, expire_time * ts->scale); | |
467 | } | |
468 | ||
db1a4972 PB |
469 | int qemu_timer_pending(QEMUTimer *ts) |
470 | { | |
471 | QEMUTimer *t; | |
472 | for(t = active_timers[ts->clock->type]; t != NULL; t = t->next) { | |
473 | if (t == ts) | |
474 | return 1; | |
475 | } | |
476 | return 0; | |
477 | } | |
478 | ||
479 | int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time) | |
480 | { | |
481 | if (!timer_head) | |
482 | return 0; | |
4a998740 | 483 | return (timer_head->expire_time <= current_time * timer_head->scale); |
db1a4972 PB |
484 | } |
485 | ||
486 | static void qemu_run_timers(QEMUClock *clock) | |
487 | { | |
488 | QEMUTimer **ptimer_head, *ts; | |
489 | int64_t current_time; | |
490 | ||
491 | if (!clock->enabled) | |
492 | return; | |
493 | ||
4a998740 | 494 | current_time = qemu_get_clock_ns(clock); |
db1a4972 PB |
495 | ptimer_head = &active_timers[clock->type]; |
496 | for(;;) { | |
497 | ts = *ptimer_head; | |
498 | if (!ts || ts->expire_time > current_time) | |
499 | break; | |
500 | /* remove timer from the list before calling the callback */ | |
501 | *ptimer_head = ts->next; | |
502 | ts->next = NULL; | |
503 | ||
504 | /* run the callback (the timer list can be modified) */ | |
505 | ts->cb(ts->opaque); | |
506 | } | |
507 | } | |
508 | ||
db1a4972 PB |
509 | int64_t qemu_get_clock_ns(QEMUClock *clock) |
510 | { | |
511 | switch(clock->type) { | |
512 | case QEMU_CLOCK_REALTIME: | |
513 | return get_clock(); | |
514 | default: | |
515 | case QEMU_CLOCK_VIRTUAL: | |
516 | if (use_icount) { | |
517 | return cpu_get_icount(); | |
518 | } else { | |
519 | return cpu_get_clock(); | |
520 | } | |
521 | case QEMU_CLOCK_HOST: | |
522 | return get_clock_realtime(); | |
523 | } | |
524 | } | |
525 | ||
526 | void init_clocks(void) | |
527 | { | |
db1a4972 PB |
528 | rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME); |
529 | vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL); | |
530 | host_clock = qemu_new_clock(QEMU_CLOCK_HOST); | |
531 | ||
532 | rtc_clock = host_clock; | |
533 | } | |
534 | ||
535 | /* save a timer */ | |
536 | void qemu_put_timer(QEMUFile *f, QEMUTimer *ts) | |
537 | { | |
538 | uint64_t expire_time; | |
539 | ||
540 | if (qemu_timer_pending(ts)) { | |
541 | expire_time = ts->expire_time; | |
542 | } else { | |
543 | expire_time = -1; | |
544 | } | |
545 | qemu_put_be64(f, expire_time); | |
546 | } | |
547 | ||
548 | void qemu_get_timer(QEMUFile *f, QEMUTimer *ts) | |
549 | { | |
550 | uint64_t expire_time; | |
551 | ||
552 | expire_time = qemu_get_be64(f); | |
553 | if (expire_time != -1) { | |
4a998740 | 554 | qemu_mod_timer_ns(ts, expire_time); |
db1a4972 PB |
555 | } else { |
556 | qemu_del_timer(ts); | |
557 | } | |
558 | } | |
559 | ||
560 | static const VMStateDescription vmstate_timers = { | |
561 | .name = "timer", | |
562 | .version_id = 2, | |
563 | .minimum_version_id = 1, | |
564 | .minimum_version_id_old = 1, | |
565 | .fields = (VMStateField []) { | |
566 | VMSTATE_INT64(cpu_ticks_offset, TimersState), | |
567 | VMSTATE_INT64(dummy, TimersState), | |
568 | VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2), | |
569 | VMSTATE_END_OF_LIST() | |
570 | } | |
571 | }; | |
572 | ||
573 | void configure_icount(const char *option) | |
574 | { | |
0be71e32 | 575 | vmstate_register(NULL, 0, &vmstate_timers, &timers_state); |
db1a4972 PB |
576 | if (!option) |
577 | return; | |
578 | ||
579 | if (strcmp(option, "auto") != 0) { | |
580 | icount_time_shift = strtol(option, NULL, 0); | |
581 | use_icount = 1; | |
582 | return; | |
583 | } | |
584 | ||
585 | use_icount = 2; | |
586 | ||
587 | /* 125MIPS seems a reasonable initial guess at the guest speed. | |
588 | It will be corrected fairly quickly anyway. */ | |
589 | icount_time_shift = 3; | |
590 | ||
591 | /* Have both realtime and virtual time triggers for speed adjustment. | |
592 | The realtime trigger catches emulated time passing too slowly, | |
593 | the virtual time trigger catches emulated time passing too fast. | |
594 | Realtime triggers occur even when idle, so use them less frequently | |
595 | than VM triggers. */ | |
7bd427d8 | 596 | icount_rt_timer = qemu_new_timer_ms(rt_clock, icount_adjust_rt, NULL); |
db1a4972 | 597 | qemu_mod_timer(icount_rt_timer, |
7bd427d8 | 598 | qemu_get_clock_ms(rt_clock) + 1000); |
74475455 | 599 | icount_vm_timer = qemu_new_timer_ns(vm_clock, icount_adjust_vm, NULL); |
db1a4972 | 600 | qemu_mod_timer(icount_vm_timer, |
74475455 | 601 | qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10); |
db1a4972 PB |
602 | } |
603 | ||
604 | void qemu_run_all_timers(void) | |
605 | { | |
ca5a2a4b PB |
606 | alarm_timer->pending = 0; |
607 | ||
db1a4972 PB |
608 | /* rearm timer, if not periodic */ |
609 | if (alarm_timer->expired) { | |
610 | alarm_timer->expired = 0; | |
611 | qemu_rearm_alarm_timer(alarm_timer); | |
612 | } | |
613 | ||
db1a4972 PB |
614 | /* vm time timers */ |
615 | if (vm_running) { | |
616 | qemu_run_timers(vm_clock); | |
617 | } | |
618 | ||
619 | qemu_run_timers(rt_clock); | |
620 | qemu_run_timers(host_clock); | |
621 | } | |
622 | ||
4c3d45eb PB |
623 | static int64_t qemu_next_alarm_deadline(void); |
624 | ||
db1a4972 | 625 | #ifdef _WIN32 |
68c23e55 | 626 | static void CALLBACK host_alarm_handler(PVOID lpParam, BOOLEAN unused) |
db1a4972 PB |
627 | #else |
628 | static void host_alarm_handler(int host_signum) | |
629 | #endif | |
630 | { | |
631 | struct qemu_alarm_timer *t = alarm_timer; | |
632 | if (!t) | |
633 | return; | |
634 | ||
635 | #if 0 | |
636 | #define DISP_FREQ 1000 | |
637 | { | |
638 | static int64_t delta_min = INT64_MAX; | |
639 | static int64_t delta_max, delta_cum, last_clock, delta, ti; | |
640 | static int count; | |
74475455 | 641 | ti = qemu_get_clock_ns(vm_clock); |
db1a4972 PB |
642 | if (last_clock != 0) { |
643 | delta = ti - last_clock; | |
644 | if (delta < delta_min) | |
645 | delta_min = delta; | |
646 | if (delta > delta_max) | |
647 | delta_max = delta; | |
648 | delta_cum += delta; | |
649 | if (++count == DISP_FREQ) { | |
650 | printf("timer: min=%" PRId64 " us max=%" PRId64 " us avg=%" PRId64 " us avg_freq=%0.3f Hz\n", | |
651 | muldiv64(delta_min, 1000000, get_ticks_per_sec()), | |
652 | muldiv64(delta_max, 1000000, get_ticks_per_sec()), | |
653 | muldiv64(delta_cum, 1000000 / DISP_FREQ, get_ticks_per_sec()), | |
654 | (double)get_ticks_per_sec() / ((double)delta_cum / DISP_FREQ)); | |
655 | count = 0; | |
656 | delta_min = INT64_MAX; | |
657 | delta_max = 0; | |
658 | delta_cum = 0; | |
659 | } | |
660 | } | |
661 | last_clock = ti; | |
662 | } | |
663 | #endif | |
664 | if (alarm_has_dynticks(t) || | |
4c3d45eb | 665 | qemu_next_alarm_deadline () <= 0) { |
db1a4972 PB |
666 | t->expired = alarm_has_dynticks(t); |
667 | t->pending = 1; | |
668 | qemu_notify_event(); | |
669 | } | |
670 | } | |
671 | ||
672 | int64_t qemu_next_deadline(void) | |
673 | { | |
674 | /* To avoid problems with overflow limit this to 2^32. */ | |
675 | int64_t delta = INT32_MAX; | |
676 | ||
677 | if (active_timers[QEMU_CLOCK_VIRTUAL]) { | |
678 | delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - | |
9c13246a | 679 | qemu_get_clock_ns(vm_clock); |
db1a4972 PB |
680 | } |
681 | if (active_timers[QEMU_CLOCK_HOST]) { | |
682 | int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - | |
9c13246a | 683 | qemu_get_clock_ns(host_clock); |
db1a4972 PB |
684 | if (hdelta < delta) |
685 | delta = hdelta; | |
686 | } | |
687 | ||
688 | if (delta < 0) | |
689 | delta = 0; | |
690 | ||
691 | return delta; | |
692 | } | |
693 | ||
4c3d45eb | 694 | static int64_t qemu_next_alarm_deadline(void) |
db1a4972 PB |
695 | { |
696 | int64_t delta; | |
697 | int64_t rtdelta; | |
698 | ||
6ad0a1ed PB |
699 | if (!use_icount && active_timers[QEMU_CLOCK_VIRTUAL]) { |
700 | delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - | |
74475455 | 701 | qemu_get_clock_ns(vm_clock); |
6ad0a1ed | 702 | } else { |
db1a4972 | 703 | delta = INT32_MAX; |
6ad0a1ed PB |
704 | } |
705 | if (active_timers[QEMU_CLOCK_HOST]) { | |
706 | int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - | |
707 | qemu_get_clock_ns(host_clock); | |
708 | if (hdelta < delta) | |
709 | delta = hdelta; | |
710 | } | |
db1a4972 | 711 | if (active_timers[QEMU_CLOCK_REALTIME]) { |
4a998740 | 712 | rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time - |
9c13246a | 713 | qemu_get_clock_ns(rt_clock)); |
db1a4972 PB |
714 | if (rtdelta < delta) |
715 | delta = rtdelta; | |
716 | } | |
717 | ||
db1a4972 PB |
718 | return delta; |
719 | } | |
720 | ||
4c3d45eb PB |
721 | #if defined(__linux__) |
722 | ||
723 | #define RTC_FREQ 1024 | |
724 | ||
db1a4972 PB |
725 | static void enable_sigio_timer(int fd) |
726 | { | |
727 | struct sigaction act; | |
728 | ||
729 | /* timer signal */ | |
730 | sigfillset(&act.sa_mask); | |
731 | act.sa_flags = 0; | |
732 | act.sa_handler = host_alarm_handler; | |
733 | ||
734 | sigaction(SIGIO, &act, NULL); | |
735 | fcntl_setfl(fd, O_ASYNC); | |
736 | fcntl(fd, F_SETOWN, getpid()); | |
737 | } | |
738 | ||
739 | static int hpet_start_timer(struct qemu_alarm_timer *t) | |
740 | { | |
741 | struct hpet_info info; | |
742 | int r, fd; | |
743 | ||
744 | fd = qemu_open("/dev/hpet", O_RDONLY); | |
745 | if (fd < 0) | |
746 | return -1; | |
747 | ||
748 | /* Set frequency */ | |
749 | r = ioctl(fd, HPET_IRQFREQ, RTC_FREQ); | |
750 | if (r < 0) { | |
751 | fprintf(stderr, "Could not configure '/dev/hpet' to have a 1024Hz timer. This is not a fatal\n" | |
752 | "error, but for better emulation accuracy type:\n" | |
753 | "'echo 1024 > /proc/sys/dev/hpet/max-user-freq' as root.\n"); | |
754 | goto fail; | |
755 | } | |
756 | ||
757 | /* Check capabilities */ | |
758 | r = ioctl(fd, HPET_INFO, &info); | |
759 | if (r < 0) | |
760 | goto fail; | |
761 | ||
762 | /* Enable periodic mode */ | |
763 | r = ioctl(fd, HPET_EPI, 0); | |
764 | if (info.hi_flags && (r < 0)) | |
765 | goto fail; | |
766 | ||
767 | /* Enable interrupt */ | |
768 | r = ioctl(fd, HPET_IE_ON, 0); | |
769 | if (r < 0) | |
770 | goto fail; | |
771 | ||
772 | enable_sigio_timer(fd); | |
773 | t->priv = (void *)(long)fd; | |
774 | ||
775 | return 0; | |
776 | fail: | |
777 | close(fd); | |
778 | return -1; | |
779 | } | |
780 | ||
781 | static void hpet_stop_timer(struct qemu_alarm_timer *t) | |
782 | { | |
783 | int fd = (long)t->priv; | |
784 | ||
785 | close(fd); | |
786 | } | |
787 | ||
788 | static int rtc_start_timer(struct qemu_alarm_timer *t) | |
789 | { | |
790 | int rtc_fd; | |
791 | unsigned long current_rtc_freq = 0; | |
792 | ||
793 | TFR(rtc_fd = qemu_open("/dev/rtc", O_RDONLY)); | |
794 | if (rtc_fd < 0) | |
795 | return -1; | |
796 | ioctl(rtc_fd, RTC_IRQP_READ, ¤t_rtc_freq); | |
797 | if (current_rtc_freq != RTC_FREQ && | |
798 | ioctl(rtc_fd, RTC_IRQP_SET, RTC_FREQ) < 0) { | |
799 | fprintf(stderr, "Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal\n" | |
800 | "error, but for better emulation accuracy either use a 2.6 host Linux kernel or\n" | |
801 | "type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.\n"); | |
802 | goto fail; | |
803 | } | |
804 | if (ioctl(rtc_fd, RTC_PIE_ON, 0) < 0) { | |
805 | fail: | |
806 | close(rtc_fd); | |
807 | return -1; | |
808 | } | |
809 | ||
810 | enable_sigio_timer(rtc_fd); | |
811 | ||
812 | t->priv = (void *)(long)rtc_fd; | |
813 | ||
814 | return 0; | |
815 | } | |
816 | ||
817 | static void rtc_stop_timer(struct qemu_alarm_timer *t) | |
818 | { | |
819 | int rtc_fd = (long)t->priv; | |
820 | ||
821 | close(rtc_fd); | |
822 | } | |
823 | ||
824 | static int dynticks_start_timer(struct qemu_alarm_timer *t) | |
825 | { | |
826 | struct sigevent ev; | |
827 | timer_t host_timer; | |
828 | struct sigaction act; | |
829 | ||
830 | sigfillset(&act.sa_mask); | |
831 | act.sa_flags = 0; | |
832 | act.sa_handler = host_alarm_handler; | |
833 | ||
834 | sigaction(SIGALRM, &act, NULL); | |
835 | ||
836 | /* | |
837 | * Initialize ev struct to 0 to avoid valgrind complaining | |
838 | * about uninitialized data in timer_create call | |
839 | */ | |
840 | memset(&ev, 0, sizeof(ev)); | |
841 | ev.sigev_value.sival_int = 0; | |
842 | ev.sigev_notify = SIGEV_SIGNAL; | |
843 | ev.sigev_signo = SIGALRM; | |
844 | ||
845 | if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) { | |
846 | perror("timer_create"); | |
847 | ||
848 | /* disable dynticks */ | |
849 | fprintf(stderr, "Dynamic Ticks disabled\n"); | |
850 | ||
851 | return -1; | |
852 | } | |
853 | ||
854 | t->priv = (void *)(long)host_timer; | |
855 | ||
856 | return 0; | |
857 | } | |
858 | ||
859 | static void dynticks_stop_timer(struct qemu_alarm_timer *t) | |
860 | { | |
861 | timer_t host_timer = (timer_t)(long)t->priv; | |
862 | ||
863 | timer_delete(host_timer); | |
864 | } | |
865 | ||
866 | static void dynticks_rearm_timer(struct qemu_alarm_timer *t) | |
867 | { | |
868 | timer_t host_timer = (timer_t)(long)t->priv; | |
869 | struct itimerspec timeout; | |
9c13246a PB |
870 | int64_t nearest_delta_ns = INT64_MAX; |
871 | int64_t current_ns; | |
db1a4972 PB |
872 | |
873 | assert(alarm_has_dynticks(t)); | |
874 | if (!active_timers[QEMU_CLOCK_REALTIME] && | |
875 | !active_timers[QEMU_CLOCK_VIRTUAL] && | |
876 | !active_timers[QEMU_CLOCK_HOST]) | |
877 | return; | |
878 | ||
4c3d45eb PB |
879 | nearest_delta_ns = qemu_next_alarm_deadline(); |
880 | if (nearest_delta_ns < MIN_TIMER_REARM_NS) | |
881 | nearest_delta_ns = MIN_TIMER_REARM_NS; | |
db1a4972 PB |
882 | |
883 | /* check whether a timer is already running */ | |
884 | if (timer_gettime(host_timer, &timeout)) { | |
885 | perror("gettime"); | |
886 | fprintf(stderr, "Internal timer error: aborting\n"); | |
887 | exit(1); | |
888 | } | |
9c13246a PB |
889 | current_ns = timeout.it_value.tv_sec * 1000000000LL + timeout.it_value.tv_nsec; |
890 | if (current_ns && current_ns <= nearest_delta_ns) | |
db1a4972 PB |
891 | return; |
892 | ||
893 | timeout.it_interval.tv_sec = 0; | |
894 | timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */ | |
9c13246a PB |
895 | timeout.it_value.tv_sec = nearest_delta_ns / 1000000000; |
896 | timeout.it_value.tv_nsec = nearest_delta_ns % 1000000000; | |
db1a4972 PB |
897 | if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) { |
898 | perror("settime"); | |
899 | fprintf(stderr, "Internal timer error: aborting\n"); | |
900 | exit(1); | |
901 | } | |
902 | } | |
903 | ||
904 | #endif /* defined(__linux__) */ | |
905 | ||
f26e5a54 SW |
906 | #if !defined(_WIN32) |
907 | ||
db1a4972 PB |
908 | static int unix_start_timer(struct qemu_alarm_timer *t) |
909 | { | |
910 | struct sigaction act; | |
911 | struct itimerval itv; | |
912 | int err; | |
913 | ||
914 | /* timer signal */ | |
915 | sigfillset(&act.sa_mask); | |
916 | act.sa_flags = 0; | |
917 | act.sa_handler = host_alarm_handler; | |
918 | ||
919 | sigaction(SIGALRM, &act, NULL); | |
920 | ||
921 | itv.it_interval.tv_sec = 0; | |
922 | /* for i386 kernel 2.6 to get 1 ms */ | |
923 | itv.it_interval.tv_usec = 999; | |
924 | itv.it_value.tv_sec = 0; | |
925 | itv.it_value.tv_usec = 10 * 1000; | |
926 | ||
927 | err = setitimer(ITIMER_REAL, &itv, NULL); | |
928 | if (err) | |
929 | return -1; | |
930 | ||
931 | return 0; | |
932 | } | |
933 | ||
934 | static void unix_stop_timer(struct qemu_alarm_timer *t) | |
935 | { | |
936 | struct itimerval itv; | |
937 | ||
938 | memset(&itv, 0, sizeof(itv)); | |
939 | setitimer(ITIMER_REAL, &itv, NULL); | |
940 | } | |
941 | ||
942 | #endif /* !defined(_WIN32) */ | |
943 | ||
944 | ||
945 | #ifdef _WIN32 | |
946 | ||
947 | static int win32_start_timer(struct qemu_alarm_timer *t) | |
948 | { | |
68c23e55 PB |
949 | HANDLE hTimer; |
950 | BOOLEAN success; | |
951 | ||
952 | /* If you call ChangeTimerQueueTimer on a one-shot timer (its period | |
953 | is zero) that has already expired, the timer is not updated. Since | |
954 | creating a new timer is relatively expensive, set a bogus one-hour | |
955 | interval in the dynticks case. */ | |
956 | success = CreateTimerQueueTimer(&hTimer, | |
957 | NULL, | |
958 | host_alarm_handler, | |
959 | t, | |
960 | 1, | |
961 | alarm_has_dynticks(t) ? 3600000 : 1, | |
962 | WT_EXECUTEINTIMERTHREAD); | |
963 | ||
964 | if (!success) { | |
db1a4972 PB |
965 | fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n", |
966 | GetLastError()); | |
db1a4972 PB |
967 | return -1; |
968 | } | |
969 | ||
68c23e55 | 970 | t->priv = (PVOID) hTimer; |
db1a4972 PB |
971 | return 0; |
972 | } | |
973 | ||
974 | static void win32_stop_timer(struct qemu_alarm_timer *t) | |
975 | { | |
68c23e55 | 976 | HANDLE hTimer = t->priv; |
db1a4972 | 977 | |
68c23e55 PB |
978 | if (hTimer) { |
979 | DeleteTimerQueueTimer(NULL, hTimer, NULL); | |
980 | } | |
db1a4972 PB |
981 | } |
982 | ||
983 | static void win32_rearm_timer(struct qemu_alarm_timer *t) | |
984 | { | |
68c23e55 | 985 | HANDLE hTimer = t->priv; |
cfced5b2 | 986 | int nearest_delta_ms; |
68c23e55 | 987 | BOOLEAN success; |
db1a4972 PB |
988 | |
989 | assert(alarm_has_dynticks(t)); | |
990 | if (!active_timers[QEMU_CLOCK_REALTIME] && | |
991 | !active_timers[QEMU_CLOCK_VIRTUAL] && | |
992 | !active_timers[QEMU_CLOCK_HOST]) | |
993 | return; | |
994 | ||
cfced5b2 PB |
995 | nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000; |
996 | if (nearest_delta_ms < 1) { | |
997 | nearest_delta_ms = 1; | |
998 | } | |
68c23e55 PB |
999 | success = ChangeTimerQueueTimer(NULL, |
1000 | hTimer, | |
1001 | nearest_delta_ms, | |
1002 | 3600000); | |
db1a4972 | 1003 | |
68c23e55 PB |
1004 | if (!success) { |
1005 | fprintf(stderr, "Failed to rearm win32 alarm timer: %ld\n", | |
1006 | GetLastError()); | |
1007 | exit(-1); | |
db1a4972 | 1008 | } |
68c23e55 | 1009 | |
db1a4972 PB |
1010 | } |
1011 | ||
1012 | #endif /* _WIN32 */ | |
1013 | ||
1014 | static void alarm_timer_on_change_state_rearm(void *opaque, int running, int reason) | |
1015 | { | |
1016 | if (running) | |
1017 | qemu_rearm_alarm_timer((struct qemu_alarm_timer *) opaque); | |
1018 | } | |
1019 | ||
1020 | int init_timer_alarm(void) | |
1021 | { | |
1022 | struct qemu_alarm_timer *t = NULL; | |
1023 | int i, err = -1; | |
1024 | ||
1025 | for (i = 0; alarm_timers[i].name; i++) { | |
1026 | t = &alarm_timers[i]; | |
1027 | ||
1028 | err = t->start(t); | |
1029 | if (!err) | |
1030 | break; | |
1031 | } | |
1032 | ||
1033 | if (err) { | |
1034 | err = -ENOENT; | |
1035 | goto fail; | |
1036 | } | |
1037 | ||
1038 | /* first event is at time 0 */ | |
1039 | t->pending = 1; | |
1040 | alarm_timer = t; | |
1041 | qemu_add_vm_change_state_handler(alarm_timer_on_change_state_rearm, t); | |
1042 | ||
1043 | return 0; | |
1044 | ||
1045 | fail: | |
1046 | return err; | |
1047 | } | |
1048 | ||
1049 | void quit_timers(void) | |
1050 | { | |
1051 | struct qemu_alarm_timer *t = alarm_timer; | |
1052 | alarm_timer = NULL; | |
1053 | t->stop(t); | |
1054 | } | |
1055 | ||
1056 | int qemu_calculate_timeout(void) | |
1057 | { | |
db1a4972 | 1058 | int timeout; |
c9f7383c PB |
1059 | int64_t add; |
1060 | int64_t delta; | |
db1a4972 | 1061 | |
225d02cd EI |
1062 | /* When using icount, making forward progress with qemu_icount when the |
1063 | guest CPU is idle is critical. We only use the static io-thread timeout | |
1064 | for non icount runs. */ | |
c9f7383c PB |
1065 | if (!use_icount || !vm_running) { |
1066 | return 5000; | |
225d02cd | 1067 | } |
225d02cd | 1068 | |
c9f7383c PB |
1069 | /* Advance virtual time to the next event. */ |
1070 | delta = qemu_icount_delta(); | |
1071 | if (delta > 0) { | |
1072 | /* If virtual time is ahead of real time then just | |
1073 | wait for IO. */ | |
1074 | timeout = (delta + 999999) / 1000000; | |
1075 | } else { | |
1076 | /* Wait for either IO to occur or the next | |
1077 | timer event. */ | |
1078 | add = qemu_next_deadline(); | |
1079 | /* We advance the timer before checking for IO. | |
1080 | Limit the amount we advance so that early IO | |
1081 | activity won't get the guest too far ahead. */ | |
1082 | if (add > 10000000) | |
1083 | add = 10000000; | |
1084 | delta += add; | |
1085 | qemu_icount += qemu_icount_round (add); | |
1086 | timeout = delta / 1000000; | |
1087 | if (timeout < 0) | |
1088 | timeout = 0; | |
db1a4972 PB |
1089 | } |
1090 | ||
1091 | return timeout; | |
db1a4972 PB |
1092 | } |
1093 |