VirtualBox

source: vbox/trunk/src/VBox/VMM/VMMAll/TMAll.cpp@ 13193

Last change on this file since 13193 was 12989, checked in by vboxsync, 16 years ago

VMM + VBox/cdefs.h: consolidated all the XYZ*DECLS of the VMM into VMM*DECL. Removed dead DECL and IN_XYZ* macros.
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File size: 53.3 KB
Line 
1/* $Id: TMAll.cpp 12989 2008-10-06 02:15:39Z vboxsync $ */
2/** @file
3 * TM - Timeout Manager, all contexts.
4 */
5
6/*
7 * Copyright (C) 2006-2007 Sun Microsystems, Inc.
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18 * Clara, CA 95054 USA or visit http://www.sun.com if you need
19 * additional information or have any questions.
20 */
21
22
23/*******************************************************************************
24* Header Files *
25*******************************************************************************/
26#define LOG_GROUP LOG_GROUP_TM
27#include <VBox/tm.h>
28#include <VBox/mm.h>
29#ifdef IN_RING3
30# include <VBox/rem.h>
31#endif
32#include "TMInternal.h"
33#include <VBox/vm.h>
34
35#include <VBox/param.h>
36#include <VBox/err.h>
37#include <VBox/log.h>
38#include <VBox/sup.h>
39#include <iprt/time.h>
40#include <iprt/assert.h>
41#include <iprt/asm.h>
42#ifdef IN_RING3
43# include <iprt/thread.h>
44#endif
45
46
47/**
48 * Notification that execution is about to start.
49 *
50 * This call must always be paired with a TMNotifyEndOfExecution call.
51 *
52 * The function may, depending on the configuration, resume the TSC and future
53 * clocks that only ticks when we're executing guest code.
54 *
55 * @param pVM Pointer to the shared VM structure.
56 */
57VMMDECL(void) TMNotifyStartOfExecution(PVM pVM)
58{
59 if (pVM->tm.s.fTSCTiedToExecution)
60 tmCpuTickResume(pVM);
61}
62
63
64/**
65 * Notification that execution is about to start.
66 *
67 * This call must always be paired with a TMNotifyStartOfExecution call.
68 *
69 * The function may, depending on the configuration, suspend the TSC and future
70 * clocks that only ticks when we're executing guest code.
71 *
72 * @param pVM Pointer to the shared VM structure.
73 */
74VMMDECL(void) TMNotifyEndOfExecution(PVM pVM)
75{
76 if (pVM->tm.s.fTSCTiedToExecution)
77 tmCpuTickPause(pVM);
78}
79
80
81/**
82 * Notification that the cpu is entering the halt state
83 *
84 * This call must always be paired with a TMNotifyEndOfExecution call.
85 *
86 * The function may, depending on the configuration, resume the TSC and future
87 * clocks that only ticks when we're halted.
88 *
89 * @param pVM Pointer to the shared VM structure.
90 */
91VMMDECL(void) TMNotifyStartOfHalt(PVM pVM)
92{
93 if ( pVM->tm.s.fTSCTiedToExecution
94 && !pVM->tm.s.fTSCNotTiedToHalt)
95 tmCpuTickResume(pVM);
96}
97
98
99/**
100 * Notification that the cpu is leaving the halt state
101 *
102 * This call must always be paired with a TMNotifyStartOfHalt call.
103 *
104 * The function may, depending on the configuration, suspend the TSC and future
105 * clocks that only ticks when we're halted.
106 *
107 * @param pVM Pointer to the shared VM structure.
108 */
109VMMDECL(void) TMNotifyEndOfHalt(PVM pVM)
110{
111 if ( pVM->tm.s.fTSCTiedToExecution
112 && !pVM->tm.s.fTSCNotTiedToHalt)
113 tmCpuTickPause(pVM);
114}
115
116
117/**
118 * Schedule the queue which was changed.
119 */
120DECLINLINE(void) tmSchedule(PTMTIMER pTimer)
121{
122 PVM pVM = pTimer->CTXALLSUFF(pVM);
123 if (VM_IS_EMT(pVM))
124 {
125 STAM_PROFILE_START(&pVM->tm.s.CTXALLSUFF(StatScheduleOne), a);
126 PTMTIMERQUEUE pQueue = &pVM->tm.s.CTXALLSUFF(paTimerQueues)[pTimer->enmClock];
127 Log3(("tmSchedule: tmTimerQueueSchedule\n"));
128 tmTimerQueueSchedule(pVM, pQueue);
129#ifdef VBOX_STRICT
130 tmTimerQueuesSanityChecks(pVM, "tmSchedule");
131#endif
132 STAM_PROFILE_STOP(&pVM->tm.s.CTXALLSUFF(StatScheduleOne), a);
133 }
134 else if (!VM_FF_ISSET(pVM, VM_FF_TIMER)) /**@todo only do this when arming the timer. */
135 {
136 STAM_COUNTER_INC(&pVM->tm.s.StatScheduleSetFF);
137 VM_FF_SET(pVM, VM_FF_TIMER);
138#ifdef IN_RING3
139 REMR3NotifyTimerPending(pVM);
140 VMR3NotifyFF(pVM, true);
141#endif
142 }
143}
144
145
146/**
147 * Try change the state to enmStateNew from enmStateOld
148 * and link the timer into the scheduling queue.
149 *
150 * @returns Success indicator.
151 * @param pTimer Timer in question.
152 * @param enmStateNew The new timer state.
153 * @param enmStateOld The old timer state.
154 */
155DECLINLINE(bool) tmTimerTry(PTMTIMER pTimer, TMTIMERSTATE enmStateNew, TMTIMERSTATE enmStateOld)
156{
157 /*
158 * Attempt state change.
159 */
160 bool fRc;
161 TM_TRY_SET_STATE(pTimer, enmStateNew, enmStateOld, fRc);
162 return fRc;
163}
164
165
166/**
167 * Links the timer onto the scheduling queue.
168 *
169 * @param pQueue The timer queue the timer belongs to.
170 * @param pTimer The timer.
171 */
172DECLINLINE(void) tmTimerLink(PTMTIMERQUEUE pQueue, PTMTIMER pTimer)
173{
174 Assert(!pTimer->offScheduleNext);
175 const int32_t offHeadNew = (intptr_t)pTimer - (intptr_t)pQueue;
176 int32_t offHead;
177 do
178 {
179 offHead = pQueue->offSchedule;
180 if (offHead)
181 pTimer->offScheduleNext = ((intptr_t)pQueue + offHead) - (intptr_t)pTimer;
182 else
183 pTimer->offScheduleNext = 0;
184 } while (!ASMAtomicCmpXchgS32(&pQueue->offSchedule, offHeadNew, offHead));
185}
186
187
188/**
189 * Try change the state to enmStateNew from enmStateOld
190 * and link the timer into the scheduling queue.
191 *
192 * @returns Success indicator.
193 * @param pTimer Timer in question.
194 * @param enmStateNew The new timer state.
195 * @param enmStateOld The old timer state.
196 */
197DECLINLINE(bool) tmTimerTryWithLink(PTMTIMER pTimer, TMTIMERSTATE enmStateNew, TMTIMERSTATE enmStateOld)
198{
199 if (tmTimerTry(pTimer, enmStateNew, enmStateOld))
200 {
201 tmTimerLink(&pTimer->CTXALLSUFF(pVM)->tm.s.CTXALLSUFF(paTimerQueues)[pTimer->enmClock], pTimer);
202 return true;
203 }
204 return false;
205}
206
207
208#ifdef VBOX_HIGH_RES_TIMERS_HACK
209/**
210 * Set FF if we've passed the next virtual event.
211 *
212 * This function is called before FFs are checked in the inner execution EM loops.
213 *
214 * @returns Virtual timer ticks to the next event.
215 * @param pVM Pointer to the shared VM structure.
216 * @thread The emulation thread.
217 */
218VMMDECL(uint64_t) TMTimerPoll(PVM pVM)
219{
220 /*
221 * Return straight away if the timer FF is already set.
222 */
223 if (VM_FF_ISSET(pVM, VM_FF_TIMER))
224 {
225 STAM_COUNTER_INC(&pVM->tm.s.StatPollAlreadySet);
226 return 0;
227 }
228
229 /*
230 * Get current time and check the expire times of the two relevant queues.
231 */
232 const uint64_t u64Now = TMVirtualGet(pVM);
233
234 /*
235 * TMCLOCK_VIRTUAL
236 */
237 const uint64_t u64Expire1 = pVM->tm.s.CTXALLSUFF(paTimerQueues)[TMCLOCK_VIRTUAL].u64Expire;
238 const int64_t i64Delta1 = u64Expire1 - u64Now;
239 if (i64Delta1 <= 0)
240 {
241 LogFlow(("TMTimerPoll: expire1=%RU64 <= now=%RU64\n", u64Expire1, u64Now));
242 STAM_COUNTER_INC(&pVM->tm.s.StatPollVirtual);
243 VM_FF_SET(pVM, VM_FF_TIMER);
244#ifdef IN_RING3
245 REMR3NotifyTimerPending(pVM);
246#endif
247 return 0;
248 }
249
250 /*
251 * TMCLOCK_VIRTUAL_SYNC
252 * This isn't quite as stright forward if in a catch-up, not only do
253 * we have to adjust the 'now' but when have to adjust the delta as well.
254 */
255 const uint64_t u64Expire2 = pVM->tm.s.CTXALLSUFF(paTimerQueues)[TMCLOCK_VIRTUAL_SYNC].u64Expire;
256 uint64_t u64VirtualSyncNow;
257 if (!pVM->tm.s.fVirtualSyncTicking)
258 u64VirtualSyncNow = pVM->tm.s.u64VirtualSync;
259 else
260 {
261 if (!pVM->tm.s.fVirtualSyncCatchUp)
262 u64VirtualSyncNow = u64Now - pVM->tm.s.offVirtualSync;
263 else
264 {
265 uint64_t off = pVM->tm.s.offVirtualSync;
266 uint64_t u64Delta = u64Now - pVM->tm.s.u64VirtualSyncCatchUpPrev;
267 if (RT_LIKELY(!(u64Delta >> 32)))
268 {
269 uint64_t u64Sub = ASMMultU64ByU32DivByU32(u64Delta, pVM->tm.s.u32VirtualSyncCatchUpPercentage, 100);
270 if (off > u64Sub + pVM->tm.s.offVirtualSyncGivenUp)
271 off -= u64Sub;
272 else
273 off = pVM->tm.s.offVirtualSyncGivenUp;
274 }
275 u64VirtualSyncNow = u64Now - off;
276 }
277 }
278 int64_t i64Delta2 = u64Expire2 - u64VirtualSyncNow;
279 if (i64Delta2 <= 0)
280 {
281 LogFlow(("TMTimerPoll: expire2=%RU64 <= now=%RU64\n", u64Expire2, u64Now));
282 STAM_COUNTER_INC(&pVM->tm.s.StatPollVirtualSync);
283 VM_FF_SET(pVM, VM_FF_TIMER);
284#ifdef IN_RING3
285 REMR3NotifyTimerPending(pVM);
286#endif
287 return 0;
288 }
289 if (pVM->tm.s.fVirtualSyncCatchUp)
290 i64Delta2 = ASMMultU64ByU32DivByU32(i64Delta2, 100, pVM->tm.s.u32VirtualSyncCatchUpPercentage + 100);
291
292 /*
293 * Return the time left to the next event.
294 */
295 STAM_COUNTER_INC(&pVM->tm.s.StatPollMiss);
296 return RT_MIN(i64Delta1, i64Delta2);
297}
298
299
300/**
301 * Set FF if we've passed the next virtual event.
302 *
303 * This function is called before FFs are checked in the inner execution EM loops.
304 *
305 * @returns The GIP timestamp of the next event.
306 * 0 if the next event has already expired.
307 * @param pVM Pointer to the shared VM structure.
308 * @param pVM Pointer to the shared VM structure.
309 * @param pu64Delta Where to store the delta.
310 * @thread The emulation thread.
311 */
312VMMDECL(uint64_t) TMTimerPollGIP(PVM pVM, uint64_t *pu64Delta)
313{
314 /*
315 * Return straight away if the timer FF is already set.
316 */
317 if (VM_FF_ISSET(pVM, VM_FF_TIMER))
318 {
319 STAM_COUNTER_INC(&pVM->tm.s.StatPollAlreadySet);
320 *pu64Delta = 0;
321 return 0;
322 }
323
324 /*
325 * Get current time and check the expire times of the two relevant queues.
326 */
327 const uint64_t u64Now = TMVirtualGet(pVM);
328
329 /*
330 * TMCLOCK_VIRTUAL
331 */
332 const uint64_t u64Expire1 = pVM->tm.s.CTXALLSUFF(paTimerQueues)[TMCLOCK_VIRTUAL].u64Expire;
333 const int64_t i64Delta1 = u64Expire1 - u64Now;
334 if (i64Delta1 <= 0)
335 {
336 LogFlow(("TMTimerPoll: expire1=%RU64 <= now=%RU64\n", u64Expire1, u64Now));
337 STAM_COUNTER_INC(&pVM->tm.s.StatPollVirtual);
338 VM_FF_SET(pVM, VM_FF_TIMER);
339#ifdef IN_RING3
340 REMR3NotifyTimerPending(pVM);
341#endif
342 *pu64Delta = 0;
343 return 0;
344 }
345
346 /*
347 * TMCLOCK_VIRTUAL_SYNC
348 * This isn't quite as stright forward if in a catch-up, not only do
349 * we have to adjust the 'now' but when have to adjust the delta as well.
350 */
351 const uint64_t u64Expire2 = pVM->tm.s.CTXALLSUFF(paTimerQueues)[TMCLOCK_VIRTUAL_SYNC].u64Expire;
352 uint64_t u64VirtualSyncNow;
353 if (!pVM->tm.s.fVirtualSyncTicking)
354 u64VirtualSyncNow = pVM->tm.s.u64VirtualSync;
355 else
356 {
357 if (!pVM->tm.s.fVirtualSyncCatchUp)
358 u64VirtualSyncNow = u64Now - pVM->tm.s.offVirtualSync;
359 else
360 {
361 uint64_t off = pVM->tm.s.offVirtualSync;
362 uint64_t u64Delta = u64Now - pVM->tm.s.u64VirtualSyncCatchUpPrev;
363 if (RT_LIKELY(!(u64Delta >> 32)))
364 {
365 uint64_t u64Sub = ASMMultU64ByU32DivByU32(u64Delta, pVM->tm.s.u32VirtualSyncCatchUpPercentage, 100);
366 if (off > u64Sub + pVM->tm.s.offVirtualSyncGivenUp)
367 off -= u64Sub;
368 else
369 off = pVM->tm.s.offVirtualSyncGivenUp;
370 }
371 u64VirtualSyncNow = u64Now - off;
372 }
373 }
374 int64_t i64Delta2 = u64Expire2 - u64VirtualSyncNow;
375 if (i64Delta2 <= 0)
376 {
377 LogFlow(("TMTimerPoll: expire2=%RU64 <= now=%RU64\n", u64Expire2, u64Now));
378 STAM_COUNTER_INC(&pVM->tm.s.StatPollVirtualSync);
379 VM_FF_SET(pVM, VM_FF_TIMER);
380#ifdef IN_RING3
381 REMR3NotifyTimerPending(pVM);
382#endif
383 *pu64Delta = 0;
384 return 0;
385 }
386 if (pVM->tm.s.fVirtualSyncCatchUp)
387 i64Delta2 = ASMMultU64ByU32DivByU32(i64Delta2, 100, pVM->tm.s.u32VirtualSyncCatchUpPercentage + 100);
388
389 /*
390 * Return the GIP time of the next event.
391 * This is the reverse of what tmVirtualGetRaw is doing.
392 */
393 STAM_COUNTER_INC(&pVM->tm.s.StatPollMiss);
394 uint64_t u64GipTime = RT_MIN(i64Delta1, i64Delta2);
395 *pu64Delta = u64GipTime;
396 u64GipTime += u64Now + pVM->tm.s.u64VirtualOffset;
397 if (RT_UNLIKELY(!pVM->tm.s.fVirtualWarpDrive))
398 {
399 u64GipTime -= pVM->tm.s.u64VirtualWarpDriveStart; /* the start is GIP time. */
400 u64GipTime *= 100;
401 u64GipTime /= pVM->tm.s.u32VirtualWarpDrivePercentage;
402 u64GipTime += pVM->tm.s.u64VirtualWarpDriveStart;
403 }
404 return u64GipTime;
405}
406#endif
407
408
409/**
410 * Gets the host context ring-3 pointer of the timer.
411 *
412 * @returns HC R3 pointer.
413 * @param pTimer Timer handle as returned by one of the create functions.
414 */
415VMMDECL(PTMTIMERR3) TMTimerR3Ptr(PTMTIMER pTimer)
416{
417 return (PTMTIMERR3)MMHyperCCToR3(pTimer->CTXALLSUFF(pVM), pTimer);
418}
419
420
421/**
422 * Gets the host context ring-0 pointer of the timer.
423 *
424 * @returns HC R0 pointer.
425 * @param pTimer Timer handle as returned by one of the create functions.
426 */
427VMMDECL(PTMTIMERR0) TMTimerR0Ptr(PTMTIMER pTimer)
428{
429 return (PTMTIMERR0)MMHyperCCToR0(pTimer->CTXALLSUFF(pVM), pTimer);
430}
431
432
433/**
434 * Gets the RC pointer of the timer.
435 *
436 * @returns RC pointer.
437 * @param pTimer Timer handle as returned by one of the create functions.
438 */
439VMMDECL(PTMTIMERRC) TMTimerRCPtr(PTMTIMER pTimer)
440{
441 return (PTMTIMERRC)MMHyperCCToRC(pTimer->CTXALLSUFF(pVM), pTimer);
442}
443
444
445/**
446 * Destroy a timer
447 *
448 * @returns VBox status.
449 * @param pTimer Timer handle as returned by one of the create functions.
450 */
451VMMDECL(int) TMTimerDestroy(PTMTIMER pTimer)
452{
453 int cRetries = 1000;
454 do
455 {
456 /*
457 * Change to any of the DESTROY states if valid.
458 */
459 TMTIMERSTATE enmState = pTimer->enmState;
460 Log2(("TMTimerDestroy: pTimer=%p:{.enmState=%s, .pszDesc='%s'} cRetries=%d\n",
461 pTimer, tmTimerState(enmState), R3STRING(pTimer->pszDesc), cRetries));
462 switch (enmState)
463 {
464 case TMTIMERSTATE_EXPIRED:
465 if (!VM_IS_EMT(pTimer->CTXALLSUFF(pVM)))
466 {
467 AssertMsgFailed(("Attempted timer destruction from other thread while expire pending! (%s)\n", R3STRING(pTimer->pszDesc)));
468 return VERR_INVALID_PARAMETER;
469 }
470 /* fall thru */
471 case TMTIMERSTATE_STOPPED:
472 if (tmTimerTryWithLink(pTimer, TMTIMERSTATE_PENDING_DESTROY, enmState))
473 {
474 tmSchedule(pTimer);
475 return VINF_SUCCESS;
476 }
477 break;
478
479 case TMTIMERSTATE_ACTIVE:
480 if (tmTimerTryWithLink(pTimer, TMTIMERSTATE_PENDING_STOP_DESTROY, enmState))
481 {
482 tmSchedule(pTimer);
483 return VINF_SUCCESS;
484 }
485 break;
486
487 case TMTIMERSTATE_PENDING_STOP:
488 case TMTIMERSTATE_PENDING_STOP_SCHEDULE:
489 if (tmTimerTry(pTimer, TMTIMERSTATE_PENDING_STOP_DESTROY, enmState))
490 {
491 tmSchedule(pTimer);
492 return VINF_SUCCESS;
493 }
494 break;
495
496 case TMTIMERSTATE_PENDING_DESTROY:
497 case TMTIMERSTATE_PENDING_STOP_DESTROY:
498 AssertMsgFailed(("How many times do you think you can destroy the same timer... (%s)\n", R3STRING(pTimer->pszDesc)));
499 return VERR_INVALID_PARAMETER;
500
501 case TMTIMERSTATE_PENDING_RESCHEDULE:
502 if (tmTimerTry(pTimer, TMTIMERSTATE_PENDING_STOP_DESTROY, enmState))
503 {
504 tmSchedule(pTimer);
505 return VINF_SUCCESS;
506 }
507 break;
508
509 case TMTIMERSTATE_PENDING_SCHEDULE:
510 if (tmTimerTry(pTimer, TMTIMERSTATE_PENDING_DESTROY, enmState))
511 {
512 tmSchedule(pTimer);
513 return VINF_SUCCESS;
514 }
515 break;
516
517 case TMTIMERSTATE_PENDING_SCHEDULE_SET_EXPIRE:
518 case TMTIMERSTATE_PENDING_RESCHEDULE_SET_EXPIRE:
519#ifdef IN_RING3
520 if (!RTThreadYield())
521 RTThreadSleep(1);
522#endif
523 break;
524
525 /*
526 * Invalid states.
527 */
528 case TMTIMERSTATE_FREE:
529 AssertMsgFailed(("Invalid timer state %d (%s)\n", enmState, R3STRING(pTimer->pszDesc)));
530 return VERR_TM_INVALID_STATE;
531 default:
532 AssertMsgFailed(("Unknown timer state %d (%s)\n", enmState, R3STRING(pTimer->pszDesc)));
533 return VERR_TM_UNKNOWN_STATE;
534 }
535 } while (cRetries-- > 0);
536
537 AssertMsgFailed(("Failed waiting for stable state. state=%d (%s)\n", pTimer->enmState, R3STRING(pTimer->pszDesc)));
538 return VERR_INTERNAL_ERROR;
539}
540
541
542/**
543 * Arm a timer with a (new) expire time.
544 *
545 * @returns VBox status.
546 * @param pTimer Timer handle as returned by one of the create functions.
547 * @param u64Expire New expire time.
548 */
549VMMDECL(int) TMTimerSet(PTMTIMER pTimer, uint64_t u64Expire)
550{
551 STAM_PROFILE_START(&pTimer->CTXALLSUFF(pVM)->tm.s.CTXALLSUFF(StatTimerSet), a);
552
553 /** @todo find the most frequently used paths and make them skip tmSchedule and tmTimerTryWithLink. */
554 int cRetries = 1000;
555 do
556 {
557 /*
558 * Change to any of the SET_EXPIRE states if valid and then to SCHEDULE or RESCHEDULE.
559 */
560 TMTIMERSTATE enmState = pTimer->enmState;
561 Log2(("TMTimerSet: pTimer=%p:{.enmState=%s, .pszDesc='%s'} cRetries=%d u64Expire=%llu\n",
562 pTimer, tmTimerState(enmState), R3STRING(pTimer->pszDesc), cRetries, u64Expire));
563 switch (enmState)
564 {
565 case TMTIMERSTATE_EXPIRED:
566 case TMTIMERSTATE_STOPPED:
567 if (tmTimerTryWithLink(pTimer, TMTIMERSTATE_PENDING_SCHEDULE_SET_EXPIRE, enmState))
568 {
569 Assert(!pTimer->offPrev);
570 Assert(!pTimer->offNext);
571 AssertMsg( pTimer->enmClock != TMCLOCK_VIRTUAL_SYNC
572 || pTimer->CTXALLSUFF(pVM)->tm.s.fVirtualSyncTicking
573 || u64Expire >= pTimer->CTXALLSUFF(pVM)->tm.s.u64VirtualSync,
574 ("%RU64 < %RU64 %s\n", u64Expire, pTimer->CTXALLSUFF(pVM)->tm.s.u64VirtualSync, R3STRING(pTimer->pszDesc)));
575 pTimer->u64Expire = u64Expire;
576 TM_SET_STATE(pTimer, TMTIMERSTATE_PENDING_SCHEDULE);
577 tmSchedule(pTimer);
578 STAM_PROFILE_STOP(&pTimer->CTXALLSUFF(pVM)->tm.s.CTXALLSUFF(StatTimerSet), a);
579 return VINF_SUCCESS;
580 }
581 break;
582
583 case TMTIMERSTATE_PENDING_SCHEDULE:
584 case TMTIMERSTATE_PENDING_STOP_SCHEDULE:
585 if (tmTimerTry(pTimer, TMTIMERSTATE_PENDING_SCHEDULE_SET_EXPIRE, enmState))
586 {
587 Assert(!pTimer->offPrev);
588 Assert(!pTimer->offNext);
589 pTimer->u64Expire = u64Expire;
590 TM_SET_STATE(pTimer, TMTIMERSTATE_PENDING_SCHEDULE);
591 tmSchedule(pTimer);
592 STAM_PROFILE_STOP(&pTimer->CTXALLSUFF(pVM)->tm.s.CTXALLSUFF(StatTimerSet), a);
593 return VINF_SUCCESS;
594 }
595 break;
596
597
598 case TMTIMERSTATE_ACTIVE:
599 if (tmTimerTryWithLink(pTimer, TMTIMERSTATE_PENDING_RESCHEDULE_SET_EXPIRE, enmState))
600 {
601 pTimer->u64Expire = u64Expire;
602 TM_SET_STATE(pTimer, TMTIMERSTATE_PENDING_RESCHEDULE);
603 tmSchedule(pTimer);
604 STAM_PROFILE_STOP(&pTimer->CTXALLSUFF(pVM)->tm.s.CTXALLSUFF(StatTimerSet), a);
605 return VINF_SUCCESS;
606 }
607 break;
608
609 case TMTIMERSTATE_PENDING_RESCHEDULE:
610 case TMTIMERSTATE_PENDING_STOP:
611 if (tmTimerTry(pTimer, TMTIMERSTATE_PENDING_RESCHEDULE_SET_EXPIRE, enmState))
612 {
613 pTimer->u64Expire = u64Expire;
614 TM_SET_STATE(pTimer, TMTIMERSTATE_PENDING_RESCHEDULE);
615 tmSchedule(pTimer);
616 STAM_PROFILE_STOP(&pTimer->CTXALLSUFF(pVM)->tm.s.CTXALLSUFF(StatTimerSet), a);
617 return VINF_SUCCESS;
618 }
619 break;
620
621
622 case TMTIMERSTATE_PENDING_SCHEDULE_SET_EXPIRE:
623 case TMTIMERSTATE_PENDING_RESCHEDULE_SET_EXPIRE:
624#ifdef IN_RING3
625 if (!RTThreadYield())
626 RTThreadSleep(1);
627#else
628/** @todo call host context and yield after a couple of iterations */
629#endif
630 break;
631
632 /*
633 * Invalid states.
634 */
635 case TMTIMERSTATE_PENDING_DESTROY:
636 case TMTIMERSTATE_PENDING_STOP_DESTROY:
637 case TMTIMERSTATE_FREE:
638 AssertMsgFailed(("Invalid timer state %d (%s)\n", enmState, R3STRING(pTimer->pszDesc)));
639 return VERR_TM_INVALID_STATE;
640 default:
641 AssertMsgFailed(("Unknown timer state %d (%s)\n", enmState, R3STRING(pTimer->pszDesc)));
642 return VERR_TM_UNKNOWN_STATE;
643 }
644 } while (cRetries-- > 0);
645
646 AssertMsgFailed(("Failed waiting for stable state. state=%d (%s)\n", pTimer->enmState, R3STRING(pTimer->pszDesc)));
647 STAM_PROFILE_STOP(&pTimer->CTXALLSUFF(pVM)->tm.s.CTXALLSUFF(StatTimerSet), a);
648 return VERR_INTERNAL_ERROR;
649}
650
651
652/**
653 * Arm a timer with a (new) expire time relative to current time.
654 *
655 * @returns VBox status.
656 * @param pTimer Timer handle as returned by one of the create functions.
657 * @param cMilliesToNext Number of millieseconds to the next tick.
658 */
659VMMDECL(int) TMTimerSetMillies(PTMTIMER pTimer, uint32_t cMilliesToNext)
660{
661 PVM pVM = pTimer->CTXALLSUFF(pVM);
662 switch (pTimer->enmClock)
663 {
664 case TMCLOCK_VIRTUAL:
665 return TMTimerSet(pTimer, cMilliesToNext * (uint64_t)TMCLOCK_FREQ_VIRTUAL / 1000 + TMVirtualGet(pVM));
666 case TMCLOCK_VIRTUAL_SYNC:
667 return TMTimerSet(pTimer, cMilliesToNext * (uint64_t)TMCLOCK_FREQ_VIRTUAL / 1000 + TMVirtualSyncGet(pVM));
668 case TMCLOCK_REAL:
669 AssertCompile(TMCLOCK_FREQ_REAL == 1000);
670 return TMTimerSet(pTimer, cMilliesToNext + TMRealGet(pVM));
671 case TMCLOCK_TSC:
672 return TMTimerSet(pTimer, cMilliesToNext * pVM->tm.s.cTSCTicksPerSecond / 1000 + TMCpuTickGet(pVM));
673
674 default:
675 AssertMsgFailed(("Invalid enmClock=%d\n", pTimer->enmClock));
676 return VERR_INTERNAL_ERROR;
677 }
678}
679
680
681/**
682 * Arm a timer with a (new) expire time relative to current time.
683 *
684 * @returns VBox status.
685 * @param pTimer Timer handle as returned by one of the create functions.
686 * @param cMicrosToNext Number of microseconds to the next tick.
687 */
688VMMDECL(int) TMTimerSetMicro(PTMTIMER pTimer, uint64_t cMicrosToNext)
689{
690 PVM pVM = pTimer->CTXALLSUFF(pVM);
691 switch (pTimer->enmClock)
692 {
693 case TMCLOCK_VIRTUAL:
694 AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
695 return TMTimerSet(pTimer, cMicrosToNext * 1000 + TMVirtualGet(pVM));
696
697 case TMCLOCK_VIRTUAL_SYNC:
698 AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
699 return TMTimerSet(pTimer, cMicrosToNext * 1000 + TMVirtualSyncGet(pVM));
700
701 case TMCLOCK_REAL:
702 AssertCompile(TMCLOCK_FREQ_REAL == 1000);
703 return TMTimerSet(pTimer, cMicrosToNext / 1000 + TMRealGet(pVM));
704
705 case TMCLOCK_TSC:
706 return TMTimerSet(pTimer, TMTimerFromMicro(pTimer, cMicrosToNext) + TMCpuTickGet(pVM));
707
708 default:
709 AssertMsgFailed(("Invalid enmClock=%d\n", pTimer->enmClock));
710 return VERR_INTERNAL_ERROR;
711 }
712}
713
714
715/**
716 * Arm a timer with a (new) expire time relative to current time.
717 *
718 * @returns VBox status.
719 * @param pTimer Timer handle as returned by one of the create functions.
720 * @param cNanosToNext Number of nanoseconds to the next tick.
721 */
722VMMDECL(int) TMTimerSetNano(PTMTIMER pTimer, uint64_t cNanosToNext)
723{
724 PVM pVM = pTimer->CTXALLSUFF(pVM);
725 switch (pTimer->enmClock)
726 {
727 case TMCLOCK_VIRTUAL:
728 AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
729 return TMTimerSet(pTimer, cNanosToNext + TMVirtualGet(pVM));
730
731 case TMCLOCK_VIRTUAL_SYNC:
732 AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
733 return TMTimerSet(pTimer, cNanosToNext + TMVirtualSyncGet(pVM));
734
735 case TMCLOCK_REAL:
736 AssertCompile(TMCLOCK_FREQ_REAL == 1000);
737 return TMTimerSet(pTimer, cNanosToNext / 1000000 + TMRealGet(pVM));
738
739 case TMCLOCK_TSC:
740 return TMTimerSet(pTimer, TMTimerFromNano(pTimer, cNanosToNext) + TMCpuTickGet(pVM));
741
742 default:
743 AssertMsgFailed(("Invalid enmClock=%d\n", pTimer->enmClock));
744 return VERR_INTERNAL_ERROR;
745 }
746}
747
748
749/**
750 * Stop the timer.
751 * Use TMR3TimerArm() to "un-stop" the timer.
752 *
753 * @returns VBox status.
754 * @param pTimer Timer handle as returned by one of the create functions.
755 */
756VMMDECL(int) TMTimerStop(PTMTIMER pTimer)
757{
758 STAM_PROFILE_START(&pTimer->CTXALLSUFF(pVM)->tm.s.CTXALLSUFF(StatTimerStop), a);
759 /** @todo see if this function needs optimizing. */
760 int cRetries = 1000;
761 do
762 {
763 /*
764 * Change to any of the SET_EXPIRE states if valid and then to SCHEDULE or RESCHEDULE.
765 */
766 TMTIMERSTATE enmState = pTimer->enmState;
767 Log2(("TMTimerStop: pTimer=%p:{.enmState=%s, .pszDesc='%s'} cRetries=%d\n",
768 pTimer, tmTimerState(enmState), R3STRING(pTimer->pszDesc), cRetries));
769 switch (enmState)
770 {
771 case TMTIMERSTATE_EXPIRED:
772 //AssertMsgFailed(("You don't stop an expired timer dude!\n"));
773 return VERR_INVALID_PARAMETER;
774
775 case TMTIMERSTATE_STOPPED:
776 case TMTIMERSTATE_PENDING_STOP:
777 case TMTIMERSTATE_PENDING_STOP_SCHEDULE:
778 STAM_PROFILE_STOP(&pTimer->CTXALLSUFF(pVM)->tm.s.CTXALLSUFF(StatTimerStop), a);
779 return VINF_SUCCESS;
780
781 case TMTIMERSTATE_PENDING_SCHEDULE:
782 if (tmTimerTry(pTimer, TMTIMERSTATE_PENDING_STOP_SCHEDULE, enmState))
783 {
784 Assert(!pTimer->offPrev);
785 Assert(!pTimer->offNext);
786 tmSchedule(pTimer);
787 STAM_PROFILE_STOP(&pTimer->CTXALLSUFF(pVM)->tm.s.CTXALLSUFF(StatTimerStop), a);
788 return VINF_SUCCESS;
789 }
790
791 case TMTIMERSTATE_PENDING_RESCHEDULE:
792 if (tmTimerTry(pTimer, TMTIMERSTATE_PENDING_STOP, enmState))
793 {
794 tmSchedule(pTimer);
795 STAM_PROFILE_STOP(&pTimer->CTXALLSUFF(pVM)->tm.s.CTXALLSUFF(StatTimerStop), a);
796 return VINF_SUCCESS;
797 }
798 break;
799
800 case TMTIMERSTATE_ACTIVE:
801 if (tmTimerTryWithLink(pTimer, TMTIMERSTATE_PENDING_STOP, enmState))
802 {
803 tmSchedule(pTimer);
804 STAM_PROFILE_STOP(&pTimer->CTXALLSUFF(pVM)->tm.s.CTXALLSUFF(StatTimerStop), a);
805 return VINF_SUCCESS;
806 }
807 break;
808
809 case TMTIMERSTATE_PENDING_SCHEDULE_SET_EXPIRE:
810 case TMTIMERSTATE_PENDING_RESCHEDULE_SET_EXPIRE:
811#ifdef IN_RING3
812 if (!RTThreadYield())
813 RTThreadSleep(1);
814#else
815/**@todo call host and yield cpu after a while. */
816#endif
817 break;
818
819 /*
820 * Invalid states.
821 */
822 case TMTIMERSTATE_PENDING_DESTROY:
823 case TMTIMERSTATE_PENDING_STOP_DESTROY:
824 case TMTIMERSTATE_FREE:
825 AssertMsgFailed(("Invalid timer state %d (%s)\n", enmState, R3STRING(pTimer->pszDesc)));
826 return VERR_TM_INVALID_STATE;
827 default:
828 AssertMsgFailed(("Unknown timer state %d (%s)\n", enmState, R3STRING(pTimer->pszDesc)));
829 return VERR_TM_UNKNOWN_STATE;
830 }
831 } while (cRetries-- > 0);
832
833 AssertMsgFailed(("Failed waiting for stable state. state=%d (%s)\n", pTimer->enmState, R3STRING(pTimer->pszDesc)));
834 STAM_PROFILE_STOP(&pTimer->CTXALLSUFF(pVM)->tm.s.CTXALLSUFF(StatTimerStop), a);
835 return VERR_INTERNAL_ERROR;
836}
837
838
839/**
840 * Get the current clock time.
841 * Handy for calculating the new expire time.
842 *
843 * @returns Current clock time.
844 * @param pTimer Timer handle as returned by one of the create functions.
845 */
846VMMDECL(uint64_t) TMTimerGet(PTMTIMER pTimer)
847{
848 uint64_t u64;
849 PVM pVM = pTimer->CTXALLSUFF(pVM);
850 switch (pTimer->enmClock)
851 {
852 case TMCLOCK_VIRTUAL:
853 u64 = TMVirtualGet(pVM);
854 break;
855 case TMCLOCK_VIRTUAL_SYNC:
856 u64 = TMVirtualSyncGet(pVM);
857 break;
858 case TMCLOCK_REAL:
859 u64 = TMRealGet(pVM);
860 break;
861 case TMCLOCK_TSC:
862 u64 = TMCpuTickGet(pVM);
863 break;
864
865 default:
866 AssertMsgFailed(("Invalid enmClock=%d\n", pTimer->enmClock));
867 return ~(uint64_t)0;
868 }
869 //Log2(("TMTimerGet: returns %llu (pTimer=%p:{.enmState=%s, .pszDesc='%s'})\n",
870 // u64, pTimer, tmTimerState(pTimer->enmState), R3STRING(pTimer->pszDesc)));
871 return u64;
872}
873
874
875/**
876 * Get the freqency of the timer clock.
877 *
878 * @returns Clock frequency (as Hz of course).
879 * @param pTimer Timer handle as returned by one of the create functions.
880 */
881VMMDECL(uint64_t) TMTimerGetFreq(PTMTIMER pTimer)
882{
883 switch (pTimer->enmClock)
884 {
885 case TMCLOCK_VIRTUAL:
886 case TMCLOCK_VIRTUAL_SYNC:
887 return TMCLOCK_FREQ_VIRTUAL;
888
889 case TMCLOCK_REAL:
890 return TMCLOCK_FREQ_REAL;
891
892 case TMCLOCK_TSC:
893 return TMCpuTicksPerSecond(pTimer->CTXALLSUFF(pVM));
894
895 default:
896 AssertMsgFailed(("Invalid enmClock=%d\n", pTimer->enmClock));
897 return 0;
898 }
899}
900
901
902/**
903 * Get the current clock time as nanoseconds.
904 *
905 * @returns The timer clock as nanoseconds.
906 * @param pTimer Timer handle as returned by one of the create functions.
907 */
908VMMDECL(uint64_t) TMTimerGetNano(PTMTIMER pTimer)
909{
910 return TMTimerToNano(pTimer, TMTimerGet(pTimer));
911}
912
913
914/**
915 * Get the current clock time as microseconds.
916 *
917 * @returns The timer clock as microseconds.
918 * @param pTimer Timer handle as returned by one of the create functions.
919 */
920VMMDECL(uint64_t) TMTimerGetMicro(PTMTIMER pTimer)
921{
922 return TMTimerToMicro(pTimer, TMTimerGet(pTimer));
923}
924
925
926/**
927 * Get the current clock time as milliseconds.
928 *
929 * @returns The timer clock as milliseconds.
930 * @param pTimer Timer handle as returned by one of the create functions.
931 */
932VMMDECL(uint64_t) TMTimerGetMilli(PTMTIMER pTimer)
933{
934 return TMTimerToMilli(pTimer, TMTimerGet(pTimer));
935}
936
937
938/**
939 * Converts the specified timer clock time to nanoseconds.
940 *
941 * @returns nanoseconds.
942 * @param pTimer Timer handle as returned by one of the create functions.
943 * @param u64Ticks The clock ticks.
944 * @remark There could be rounding errors here. We just do a simple integere divide
945 * without any adjustments.
946 */
947VMMDECL(uint64_t) TMTimerToNano(PTMTIMER pTimer, uint64_t u64Ticks)
948{
949 switch (pTimer->enmClock)
950 {
951 case TMCLOCK_VIRTUAL:
952 case TMCLOCK_VIRTUAL_SYNC:
953 AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
954 return u64Ticks;
955
956 case TMCLOCK_REAL:
957 AssertCompile(TMCLOCK_FREQ_REAL == 1000);
958 return u64Ticks * 1000000;
959
960 case TMCLOCK_TSC:
961 AssertReleaseMsgFailed(("TMCLOCK_TSC conversions are not implemented\n"));
962 return 0;
963
964 default:
965 AssertMsgFailed(("Invalid enmClock=%d\n", pTimer->enmClock));
966 return 0;
967 }
968}
969
970
971/**
972 * Converts the specified timer clock time to microseconds.
973 *
974 * @returns microseconds.
975 * @param pTimer Timer handle as returned by one of the create functions.
976 * @param u64Ticks The clock ticks.
977 * @remark There could be rounding errors here. We just do a simple integere divide
978 * without any adjustments.
979 */
980VMMDECL(uint64_t) TMTimerToMicro(PTMTIMER pTimer, uint64_t u64Ticks)
981{
982 switch (pTimer->enmClock)
983 {
984 case TMCLOCK_VIRTUAL:
985 case TMCLOCK_VIRTUAL_SYNC:
986 AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
987 return u64Ticks / 1000;
988
989 case TMCLOCK_REAL:
990 AssertCompile(TMCLOCK_FREQ_REAL == 1000);
991 return u64Ticks * 1000;
992
993 case TMCLOCK_TSC:
994 AssertReleaseMsgFailed(("TMCLOCK_TSC conversions are not implemented\n"));
995 return 0;
996
997 default:
998 AssertMsgFailed(("Invalid enmClock=%d\n", pTimer->enmClock));
999 return 0;
1000 }
1001}
1002
1003
1004/**
1005 * Converts the specified timer clock time to milliseconds.
1006 *
1007 * @returns milliseconds.
1008 * @param pTimer Timer handle as returned by one of the create functions.
1009 * @param u64Ticks The clock ticks.
1010 * @remark There could be rounding errors here. We just do a simple integere divide
1011 * without any adjustments.
1012 */
1013VMMDECL(uint64_t) TMTimerToMilli(PTMTIMER pTimer, uint64_t u64Ticks)
1014{
1015 switch (pTimer->enmClock)
1016 {
1017 case TMCLOCK_VIRTUAL:
1018 case TMCLOCK_VIRTUAL_SYNC:
1019 AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
1020 return u64Ticks / 1000000;
1021
1022 case TMCLOCK_REAL:
1023 AssertCompile(TMCLOCK_FREQ_REAL == 1000);
1024 return u64Ticks;
1025
1026 case TMCLOCK_TSC:
1027 AssertReleaseMsgFailed(("TMCLOCK_TSC conversions are not implemented\n"));
1028 return 0;
1029
1030 default:
1031 AssertMsgFailed(("Invalid enmClock=%d\n", pTimer->enmClock));
1032 return 0;
1033 }
1034}
1035
1036
1037/**
1038 * Converts the specified nanosecond timestamp to timer clock ticks.
1039 *
1040 * @returns timer clock ticks.
1041 * @param pTimer Timer handle as returned by one of the create functions.
1042 * @param u64NanoTS The nanosecond value ticks to convert.
1043 * @remark There could be rounding and overflow errors here.
1044 */
1045VMMDECL(uint64_t) TMTimerFromNano(PTMTIMER pTimer, uint64_t u64NanoTS)
1046{
1047 switch (pTimer->enmClock)
1048 {
1049 case TMCLOCK_VIRTUAL:
1050 case TMCLOCK_VIRTUAL_SYNC:
1051 AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
1052 return u64NanoTS;
1053
1054 case TMCLOCK_REAL:
1055 AssertCompile(TMCLOCK_FREQ_REAL == 1000);
1056 return u64NanoTS / 1000000;
1057
1058 case TMCLOCK_TSC:
1059 AssertReleaseMsgFailed(("TMCLOCK_TSC conversions are not implemented\n"));
1060 return 0;
1061
1062 default:
1063 AssertMsgFailed(("Invalid enmClock=%d\n", pTimer->enmClock));
1064 return 0;
1065 }
1066}
1067
1068
1069/**
1070 * Converts the specified microsecond timestamp to timer clock ticks.
1071 *
1072 * @returns timer clock ticks.
1073 * @param pTimer Timer handle as returned by one of the create functions.
1074 * @param u64MicroTS The microsecond value ticks to convert.
1075 * @remark There could be rounding and overflow errors here.
1076 */
1077VMMDECL(uint64_t) TMTimerFromMicro(PTMTIMER pTimer, uint64_t u64MicroTS)
1078{
1079 switch (pTimer->enmClock)
1080 {
1081 case TMCLOCK_VIRTUAL:
1082 case TMCLOCK_VIRTUAL_SYNC:
1083 AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
1084 return u64MicroTS * 1000;
1085
1086 case TMCLOCK_REAL:
1087 AssertCompile(TMCLOCK_FREQ_REAL == 1000);
1088 return u64MicroTS / 1000;
1089
1090 case TMCLOCK_TSC:
1091 AssertReleaseMsgFailed(("TMCLOCK_TSC conversions are not implemented\n"));
1092 return 0;
1093
1094 default:
1095 AssertMsgFailed(("Invalid enmClock=%d\n", pTimer->enmClock));
1096 return 0;
1097 }
1098}
1099
1100
1101/**
1102 * Converts the specified millisecond timestamp to timer clock ticks.
1103 *
1104 * @returns timer clock ticks.
1105 * @param pTimer Timer handle as returned by one of the create functions.
1106 * @param u64MilliTS The millisecond value ticks to convert.
1107 * @remark There could be rounding and overflow errors here.
1108 */
1109VMMDECL(uint64_t) TMTimerFromMilli(PTMTIMER pTimer, uint64_t u64MilliTS)
1110{
1111 switch (pTimer->enmClock)
1112 {
1113 case TMCLOCK_VIRTUAL:
1114 case TMCLOCK_VIRTUAL_SYNC:
1115 AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
1116 return u64MilliTS * 1000000;
1117
1118 case TMCLOCK_REAL:
1119 AssertCompile(TMCLOCK_FREQ_REAL == 1000);
1120 return u64MilliTS;
1121
1122 case TMCLOCK_TSC:
1123 AssertReleaseMsgFailed(("TMCLOCK_TSC conversions are not implemented\n"));
1124 return 0;
1125
1126 default:
1127 AssertMsgFailed(("Invalid enmClock=%d\n", pTimer->enmClock));
1128 return 0;
1129 }
1130}
1131
1132
1133/**
1134 * Get the expire time of the timer.
1135 * Only valid for active timers.
1136 *
1137 * @returns Expire time of the timer.
1138 * @param pTimer Timer handle as returned by one of the create functions.
1139 */
1140VMMDECL(uint64_t) TMTimerGetExpire(PTMTIMER pTimer)
1141{
1142 int cRetries = 1000;
1143 do
1144 {
1145 TMTIMERSTATE enmState = pTimer->enmState;
1146 switch (enmState)
1147 {
1148 case TMTIMERSTATE_EXPIRED:
1149 case TMTIMERSTATE_STOPPED:
1150 case TMTIMERSTATE_PENDING_STOP:
1151 case TMTIMERSTATE_PENDING_STOP_SCHEDULE:
1152 Log2(("TMTimerGetExpire: returns ~0 (pTimer=%p:{.enmState=%s, .pszDesc='%s'})\n",
1153 pTimer, tmTimerState(pTimer->enmState), R3STRING(pTimer->pszDesc)));
1154 return ~(uint64_t)0;
1155
1156 case TMTIMERSTATE_ACTIVE:
1157 case TMTIMERSTATE_PENDING_RESCHEDULE:
1158 case TMTIMERSTATE_PENDING_SCHEDULE:
1159 Log2(("TMTimerGetExpire: returns %llu (pTimer=%p:{.enmState=%s, .pszDesc='%s'})\n",
1160 pTimer->u64Expire, pTimer, tmTimerState(pTimer->enmState), R3STRING(pTimer->pszDesc)));
1161 return pTimer->u64Expire;
1162
1163 case TMTIMERSTATE_PENDING_SCHEDULE_SET_EXPIRE:
1164 case TMTIMERSTATE_PENDING_RESCHEDULE_SET_EXPIRE:
1165#ifdef IN_RING3
1166 if (!RTThreadYield())
1167 RTThreadSleep(1);
1168#endif
1169 break;
1170
1171 /*
1172 * Invalid states.
1173 */
1174 case TMTIMERSTATE_PENDING_DESTROY:
1175 case TMTIMERSTATE_PENDING_STOP_DESTROY:
1176 case TMTIMERSTATE_FREE:
1177 AssertMsgFailed(("Invalid timer state %d (%s)\n", enmState, R3STRING(pTimer->pszDesc)));
1178 Log2(("TMTimerGetExpire: returns ~0 (pTimer=%p:{.enmState=%s, .pszDesc='%s'})\n",
1179 pTimer, tmTimerState(pTimer->enmState), R3STRING(pTimer->pszDesc)));
1180 return ~(uint64_t)0;
1181 default:
1182 AssertMsgFailed(("Unknown timer state %d (%s)\n", enmState, R3STRING(pTimer->pszDesc)));
1183 return ~(uint64_t)0;
1184 }
1185 } while (cRetries-- > 0);
1186
1187 AssertMsgFailed(("Failed waiting for stable state. state=%d (%s)\n", pTimer->enmState, R3STRING(pTimer->pszDesc)));
1188 Log2(("TMTimerGetExpire: returns ~0 (pTimer=%p:{.enmState=%s, .pszDesc='%s'})\n",
1189 pTimer, tmTimerState(pTimer->enmState), R3STRING(pTimer->pszDesc)));
1190 return ~(uint64_t)0;
1191}
1192
1193
1194/**
1195 * Checks if a timer is active or not.
1196 *
1197 * @returns True if active.
1198 * @returns False if not active.
1199 * @param pTimer Timer handle as returned by one of the create functions.
1200 */
1201VMMDECL(bool) TMTimerIsActive(PTMTIMER pTimer)
1202{
1203 TMTIMERSTATE enmState = pTimer->enmState;
1204 switch (enmState)
1205 {
1206 case TMTIMERSTATE_STOPPED:
1207 case TMTIMERSTATE_EXPIRED:
1208 case TMTIMERSTATE_PENDING_STOP:
1209 case TMTIMERSTATE_PENDING_STOP_SCHEDULE:
1210 Log2(("TMTimerIsActive: returns false (pTimer=%p:{.enmState=%s, .pszDesc='%s'})\n",
1211 pTimer, tmTimerState(pTimer->enmState), R3STRING(pTimer->pszDesc)));
1212 return false;
1213
1214 case TMTIMERSTATE_ACTIVE:
1215 case TMTIMERSTATE_PENDING_RESCHEDULE:
1216 case TMTIMERSTATE_PENDING_SCHEDULE:
1217 case TMTIMERSTATE_PENDING_SCHEDULE_SET_EXPIRE:
1218 case TMTIMERSTATE_PENDING_RESCHEDULE_SET_EXPIRE:
1219 Log2(("TMTimerIsActive: returns true (pTimer=%p:{.enmState=%s, .pszDesc='%s'})\n",
1220 pTimer, tmTimerState(pTimer->enmState), R3STRING(pTimer->pszDesc)));
1221 return true;
1222
1223 /*
1224 * Invalid states.
1225 */
1226 case TMTIMERSTATE_PENDING_DESTROY:
1227 case TMTIMERSTATE_PENDING_STOP_DESTROY:
1228 case TMTIMERSTATE_FREE:
1229 AssertMsgFailed(("Invalid timer state %s (%s)\n", tmTimerState(enmState), R3STRING(pTimer->pszDesc)));
1230 Log2(("TMTimerIsActive: returns false (pTimer=%p:{.enmState=%s, .pszDesc='%s'})\n",
1231 pTimer, tmTimerState(pTimer->enmState), R3STRING(pTimer->pszDesc)));
1232 return false;
1233 default:
1234 AssertMsgFailed(("Unknown timer state %d (%s)\n", enmState, R3STRING(pTimer->pszDesc)));
1235 return false;
1236 }
1237}
1238
1239
1240/**
1241 * Convert state to string.
1242 *
1243 * @returns Readonly status name.
1244 * @param enmState State.
1245 */
1246const char *tmTimerState(TMTIMERSTATE enmState)
1247{
1248 switch (enmState)
1249 {
1250#define CASE(state) case state: return #state + sizeof("TMTIMERSTATE_") - 1
1251 CASE(TMTIMERSTATE_STOPPED);
1252 CASE(TMTIMERSTATE_ACTIVE);
1253 CASE(TMTIMERSTATE_EXPIRED);
1254 CASE(TMTIMERSTATE_PENDING_STOP);
1255 CASE(TMTIMERSTATE_PENDING_STOP_SCHEDULE);
1256 CASE(TMTIMERSTATE_PENDING_SCHEDULE_SET_EXPIRE);
1257 CASE(TMTIMERSTATE_PENDING_SCHEDULE);
1258 CASE(TMTIMERSTATE_PENDING_RESCHEDULE_SET_EXPIRE);
1259 CASE(TMTIMERSTATE_PENDING_RESCHEDULE);
1260 CASE(TMTIMERSTATE_PENDING_STOP_DESTROY);
1261 CASE(TMTIMERSTATE_PENDING_DESTROY);
1262 CASE(TMTIMERSTATE_FREE);
1263 default:
1264 AssertMsgFailed(("Invalid state enmState=%d\n", enmState));
1265 return "Invalid state!";
1266#undef CASE
1267 }
1268}
1269
1270
1271/**
1272 * Schedules the given timer on the given queue.
1273 *
1274 * @param pQueue The timer queue.
1275 * @param pTimer The timer that needs scheduling.
1276 */
1277DECLINLINE(void) tmTimerQueueScheduleOne(PTMTIMERQUEUE pQueue, PTMTIMER pTimer)
1278{
1279 /*
1280 * Processing.
1281 */
1282 unsigned cRetries = 2;
1283 do
1284 {
1285 TMTIMERSTATE enmState = pTimer->enmState;
1286 switch (enmState)
1287 {
1288 /*
1289 * Reschedule timer (in the active list).
1290 */
1291 case TMTIMERSTATE_PENDING_RESCHEDULE:
1292 {
1293 if (RT_UNLIKELY(!tmTimerTry(pTimer, TMTIMERSTATE_PENDING_SCHEDULE, TMTIMERSTATE_PENDING_RESCHEDULE)))
1294 break; /* retry */
1295
1296 const PTMTIMER pPrev = TMTIMER_GET_PREV(pTimer);
1297 const PTMTIMER pNext = TMTIMER_GET_NEXT(pTimer);
1298 if (pPrev)
1299 TMTIMER_SET_NEXT(pPrev, pNext);
1300 else
1301 {
1302 TMTIMER_SET_HEAD(pQueue, pNext);
1303 pQueue->u64Expire = pNext ? pNext->u64Expire : INT64_MAX;
1304 }
1305 if (pNext)
1306 TMTIMER_SET_PREV(pNext, pPrev);
1307 pTimer->offNext = 0;
1308 pTimer->offPrev = 0;
1309 /* fall thru */
1310 }
1311
1312 /*
1313 * Schedule timer (insert into the active list).
1314 */
1315 case TMTIMERSTATE_PENDING_SCHEDULE:
1316 {
1317 Assert(!pTimer->offNext); Assert(!pTimer->offPrev);
1318 if (RT_UNLIKELY(!tmTimerTry(pTimer, TMTIMERSTATE_ACTIVE, TMTIMERSTATE_PENDING_SCHEDULE)))
1319 break; /* retry */
1320
1321 PTMTIMER pCur = TMTIMER_GET_HEAD(pQueue);
1322 if (pCur)
1323 {
1324 const uint64_t u64Expire = pTimer->u64Expire;
1325 for (;; pCur = TMTIMER_GET_NEXT(pCur))
1326 {
1327 if (pCur->u64Expire > u64Expire)
1328 {
1329 const PTMTIMER pPrev = TMTIMER_GET_PREV(pCur);
1330 TMTIMER_SET_NEXT(pTimer, pCur);
1331 TMTIMER_SET_PREV(pTimer, pPrev);
1332 if (pPrev)
1333 TMTIMER_SET_NEXT(pPrev, pTimer);
1334 else
1335 {
1336 TMTIMER_SET_HEAD(pQueue, pTimer);
1337 pQueue->u64Expire = u64Expire;
1338 }
1339 TMTIMER_SET_PREV(pCur, pTimer);
1340 return;
1341 }
1342 if (!pCur->offNext)
1343 {
1344 TMTIMER_SET_NEXT(pCur, pTimer);
1345 TMTIMER_SET_PREV(pTimer, pCur);
1346 return;
1347 }
1348 }
1349 }
1350 else
1351 {
1352 TMTIMER_SET_HEAD(pQueue, pTimer);
1353 pQueue->u64Expire = pTimer->u64Expire;
1354 }
1355 return;
1356 }
1357
1358 /*
1359 * Stop the timer in active list.
1360 */
1361 case TMTIMERSTATE_PENDING_STOP:
1362 {
1363 if (RT_UNLIKELY(!tmTimerTry(pTimer, TMTIMERSTATE_PENDING_STOP_SCHEDULE, TMTIMERSTATE_PENDING_STOP)))
1364 break; /* retry */
1365
1366 const PTMTIMER pPrev = TMTIMER_GET_PREV(pTimer);
1367 const PTMTIMER pNext = TMTIMER_GET_NEXT(pTimer);
1368 if (pPrev)
1369 TMTIMER_SET_NEXT(pPrev, pNext);
1370 else
1371 {
1372 TMTIMER_SET_HEAD(pQueue, pNext);
1373 pQueue->u64Expire = pNext ? pNext->u64Expire : INT64_MAX;
1374 }
1375 if (pNext)
1376 TMTIMER_SET_PREV(pNext, pPrev);
1377 pTimer->offNext = 0;
1378 pTimer->offPrev = 0;
1379 /* fall thru */
1380 }
1381
1382 /*
1383 * Stop the timer (not on the active list).
1384 */
1385 case TMTIMERSTATE_PENDING_STOP_SCHEDULE:
1386 Assert(!pTimer->offNext); Assert(!pTimer->offPrev);
1387 if (RT_UNLIKELY(!tmTimerTry(pTimer, TMTIMERSTATE_STOPPED, TMTIMERSTATE_PENDING_STOP_SCHEDULE)))
1388 break;
1389 return;
1390
1391 /*
1392 * Stop & destroy the timer.
1393 */
1394 case TMTIMERSTATE_PENDING_STOP_DESTROY:
1395 {
1396 const PTMTIMER pPrev = TMTIMER_GET_PREV(pTimer);
1397 const PTMTIMER pNext = TMTIMER_GET_NEXT(pTimer);
1398 if (pPrev)
1399 TMTIMER_SET_NEXT(pPrev, pNext);
1400 else
1401 {
1402 TMTIMER_SET_HEAD(pQueue, pNext);
1403 pQueue->u64Expire = pNext ? pNext->u64Expire : INT64_MAX;
1404 }
1405 if (pNext)
1406 TMTIMER_SET_PREV(pNext, pPrev);
1407 pTimer->offNext = 0;
1408 pTimer->offPrev = 0;
1409 /* fall thru */
1410 }
1411
1412 /*
1413 * Destroy the timer.
1414 */
1415 case TMTIMERSTATE_PENDING_DESTROY:
1416 {
1417 Assert(!pTimer->offNext); Assert(!pTimer->offPrev);
1418 PVM pVM = pTimer->CTXALLSUFF(pVM);
1419 const PTMTIMER pBigPrev = (PTMTIMER)(pTimer->pBigPrev ? MMHyperR3ToCC(pVM, pTimer->pBigPrev) : NULL);
1420 const PTMTIMER pBigNext = (PTMTIMER)(pTimer->pBigNext ? MMHyperR3ToCC(pVM, pTimer->pBigNext) : NULL);
1421
1422 /* unlink from created list */
1423 if (pBigPrev)
1424 pBigPrev->pBigNext = pTimer->pBigNext;
1425 else
1426 pVM->tm.s.pCreated = pTimer->pBigNext;
1427 if (pBigNext)
1428 pBigNext->pBigPrev = pTimer->pBigPrev;
1429 pTimer->pBigNext = 0;
1430 pTimer->pBigPrev = 0;
1431
1432 /* free */
1433 Log2(("TM: Inserting %p into the free list ahead of %p!\n", pTimer, pVM->tm.s.pFree));
1434 pTimer->pBigNext = pVM->tm.s.pFree;
1435 pVM->tm.s.pFree = (PTMTIMERR3)MMHyperCCToR3(pVM, pTimer);
1436 TM_SET_STATE(pTimer, TMTIMERSTATE_FREE);
1437 return;
1438 }
1439
1440 /*
1441 * Postpone these until they get into the right state.
1442 */
1443 case TMTIMERSTATE_PENDING_RESCHEDULE_SET_EXPIRE:
1444 case TMTIMERSTATE_PENDING_SCHEDULE_SET_EXPIRE:
1445 tmTimerLink(pQueue, pTimer);
1446 STAM_COUNTER_INC(&pTimer->CTXALLSUFF(pVM)->tm.s.CTXALLSUFF(StatPostponed));
1447 return;
1448
1449 /*
1450 * None of these can be in the schedule.
1451 */
1452 case TMTIMERSTATE_FREE:
1453 case TMTIMERSTATE_STOPPED:
1454 case TMTIMERSTATE_ACTIVE:
1455 case TMTIMERSTATE_EXPIRED:
1456 default:
1457 AssertMsgFailed(("Timer (%p) in the scheduling list has an invalid state %s (%d)!",
1458 pTimer, tmTimerState(pTimer->enmState), pTimer->enmState));
1459 return;
1460 }
1461 } while (cRetries-- > 0);
1462}
1463
1464
1465/**
1466 * Schedules the specified timer queue.
1467 *
1468 * @param pVM The VM to run the timers for.
1469 * @param pQueue The queue to schedule.
1470 */
1471void tmTimerQueueSchedule(PVM pVM, PTMTIMERQUEUE pQueue)
1472{
1473 VM_ASSERT_EMT(pVM);
1474
1475 /*
1476 * Dequeue the scheduling list and iterate it.
1477 */
1478 int32_t offNext = ASMAtomicXchgS32(&pQueue->offSchedule, 0);
1479 Log2(("tmTimerQueueSchedule: pQueue=%p:{.enmClock=%d, offNext=%RI32}\n", pQueue, pQueue->enmClock, offNext));
1480 if (!offNext)
1481 return;
1482 PTMTIMER pNext = (PTMTIMER)((intptr_t)pQueue + offNext);
1483 while (pNext)
1484 {
1485 /*
1486 * Unlink the head timer and find the next one.
1487 */
1488 PTMTIMER pTimer = pNext;
1489 pNext = pNext->offScheduleNext ? (PTMTIMER)((intptr_t)pNext + pNext->offScheduleNext) : NULL;
1490 pTimer->offScheduleNext = 0;
1491
1492 /*
1493 * Do the scheduling.
1494 */
1495 Log2(("tmTimerQueueSchedule: pTimer=%p:{.enmState=%s, .enmClock=%d, .enmType=%d, .pszDesc=%s}\n",
1496 pTimer, tmTimerState(pTimer->enmState), pTimer->enmClock, pTimer->enmType, R3STRING(pTimer->pszDesc)));
1497 tmTimerQueueScheduleOne(pQueue, pTimer);
1498 Log2(("tmTimerQueueSchedule: new %s\n", tmTimerState(pTimer->enmState)));
1499 } /* foreach timer in current schedule batch. */
1500}
1501
1502
1503#ifdef VBOX_STRICT
1504/**
1505 * Checks that the timer queues are sane.
1506 *
1507 * @param pVM VM handle.
1508 */
1509void tmTimerQueuesSanityChecks(PVM pVM, const char *pszWhere)
1510{
1511 /*
1512 * Check the linking of the active lists.
1513 */
1514 for (int i = 0; i < TMCLOCK_MAX; i++)
1515 {
1516 PTMTIMERQUEUE pQueue = &pVM->tm.s.CTXALLSUFF(paTimerQueues)[i];
1517 Assert((int)pQueue->enmClock == i);
1518 PTMTIMER pPrev = NULL;
1519 for (PTMTIMER pCur = TMTIMER_GET_HEAD(pQueue); pCur; pPrev = pCur, pCur = TMTIMER_GET_NEXT(pCur))
1520 {
1521 AssertMsg((int)pCur->enmClock == i, ("%s: %d != %d\n", pszWhere, pCur->enmClock, i));
1522 AssertMsg(TMTIMER_GET_PREV(pCur) == pPrev, ("%s: %p != %p\n", pszWhere, TMTIMER_GET_PREV(pCur), pPrev));
1523 TMTIMERSTATE enmState = pCur->enmState;
1524 switch (enmState)
1525 {
1526 case TMTIMERSTATE_ACTIVE:
1527 AssertMsg(!pCur->offScheduleNext, ("%s: %RI32\n", pszWhere, pCur->offScheduleNext));
1528 break;
1529 case TMTIMERSTATE_PENDING_STOP:
1530 case TMTIMERSTATE_PENDING_STOP_DESTROY:
1531 case TMTIMERSTATE_PENDING_RESCHEDULE:
1532 break;
1533 default:
1534 AssertMsgFailed(("%s: Invalid state enmState=%d %s\n", pszWhere, enmState, tmTimerState(enmState)));
1535 break;
1536 }
1537 }
1538 }
1539
1540
1541# ifdef IN_RING3
1542 /*
1543 * Do the big list and check that active timers all are in the active lists.
1544 */
1545 PTMTIMERR3 pPrev = NULL;
1546 for (PTMTIMERR3 pCur = pVM->tm.s.pCreated; pCur; pPrev = pCur, pCur = pCur->pBigNext)
1547 {
1548 Assert(pCur->pBigPrev == pPrev);
1549 Assert((unsigned)pCur->enmClock < (unsigned)TMCLOCK_MAX);
1550
1551 TMTIMERSTATE enmState = pCur->enmState;
1552 switch (enmState)
1553 {
1554 case TMTIMERSTATE_ACTIVE:
1555 case TMTIMERSTATE_PENDING_STOP:
1556 case TMTIMERSTATE_PENDING_STOP_DESTROY:
1557 case TMTIMERSTATE_PENDING_RESCHEDULE:
1558 case TMTIMERSTATE_PENDING_RESCHEDULE_SET_EXPIRE:
1559 {
1560 PTMTIMERR3 pCurAct = TMTIMER_GET_HEAD(&pVM->tm.s.CTXALLSUFF(paTimerQueues)[pCur->enmClock]);
1561 Assert(pCur->offPrev || pCur == pCurAct);
1562 while (pCurAct && pCurAct != pCur)
1563 pCurAct = TMTIMER_GET_NEXT(pCurAct);
1564 Assert(pCurAct == pCur);
1565 break;
1566 }
1567
1568 case TMTIMERSTATE_PENDING_DESTROY:
1569 case TMTIMERSTATE_PENDING_SCHEDULE:
1570 case TMTIMERSTATE_PENDING_STOP_SCHEDULE:
1571 case TMTIMERSTATE_STOPPED:
1572 case TMTIMERSTATE_EXPIRED:
1573 {
1574 Assert(!pCur->offNext);
1575 Assert(!pCur->offPrev);
1576 for (PTMTIMERR3 pCurAct = TMTIMER_GET_HEAD(&pVM->tm.s.CTXALLSUFF(paTimerQueues)[pCur->enmClock]);
1577 pCurAct;
1578 pCurAct = TMTIMER_GET_NEXT(pCurAct))
1579 {
1580 Assert(pCurAct != pCur);
1581 Assert(TMTIMER_GET_NEXT(pCurAct) != pCur);
1582 Assert(TMTIMER_GET_PREV(pCurAct) != pCur);
1583 }
1584 break;
1585 }
1586
1587 /* ignore */
1588 case TMTIMERSTATE_PENDING_SCHEDULE_SET_EXPIRE:
1589 break;
1590
1591 /* shouldn't get here! */
1592 default:
1593 AssertMsgFailed(("Invalid state enmState=%d %s\n", enmState, tmTimerState(enmState)));
1594 break;
1595 }
1596 }
1597# endif /* IN_RING3 */
1598}
1599#endif /* !VBOX_STRICT */
1600
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