TMInternal.h@ 2296

Last change on this file since 2296 was 2283, checked in by vboxsync, 18 years ago
Working TMCLOCK_VIRTUAL_SYNC.
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1	/* $Id: TMInternal.h 2283 2007-04-20 22:27:52Z vboxsync $ */
2	/** @file
3	* TM - Internal header file.
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung GmbH
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 as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22	#ifndef __TMInternal_h__
23	#define __TMInternal_h__
24
25	#include <VBox/cdefs.h>
26	#include <VBox/types.h>
27	#include <iprt/timer.h>
28	#include <VBox/stam.h>
29
30	__BEGIN_DECLS
31
32
33	/** @defgroup grp_tm_int Internal
34	* @ingroup grp_tm
35	* @internal
36	* @{
37	*/
38
39	/** Frequency of the real clock. */
40	#define TMCLOCK_FREQ_REAL UINT32_C(1000)
41	/** Frequency of the virtual clock. */
42	#define TMCLOCK_FREQ_VIRTUAL UINT32_C(1000000000)
43
44
45	/**
46	* Timer type.
47	*/
48	typedef enum TMTIMERTYPE
49	{
50	/** Device timer. */
51	TMTIMERTYPE_DEV = 1,
52	/** Driver timer. */
53	TMTIMERTYPE_DRV,
54	/** Internal timer . */
55	TMTIMERTYPE_INTERNAL,
56	/** External timer. */
57	TMTIMERTYPE_EXTERNAL
58	} TMTIMERTYPE;
59
60	/**
61	* Timer state
62	*/
63	typedef enum TMTIMERSTATE
64	{
65	/** Timer is stopped. */
66	TMTIMERSTATE_STOPPED = 1,
67	/** Timer is active. */
68	TMTIMERSTATE_ACTIVE,
69	/** Timer is expired, is being delivered. */
70	TMTIMERSTATE_EXPIRED,
71
72	/** Timer is stopped but still in the active list.
73	* Currently in the ScheduleTimers list. */
74	TMTIMERSTATE_PENDING_STOP,
75	/** Timer is stopped but needs unlinking from the ScheduleTimers list.
76	* Currently in the ScheduleTimers list. */
77	TMTIMERSTATE_PENDING_STOP_SCHEDULE,
78	/** Timer is being modified and will soon be pending scheduling.
79	* Currently in the ScheduleTimers list. */
80	TMTIMERSTATE_PENDING_SCHEDULE_SET_EXPIRE,
81	/** Timer is pending scheduling.
82	* Currently in the ScheduleTimers list. */
83	TMTIMERSTATE_PENDING_SCHEDULE,
84	/** Timer is being modified and will soon be pending rescheduling.
85	* Currently in the ScheduleTimers list and the active list. */
86	TMTIMERSTATE_PENDING_RESCHEDULE_SET_EXPIRE,
87	/** Timer is modified and is now pending rescheduling.
88	* Currently in the ScheduleTimers list and the active list. */
89	TMTIMERSTATE_PENDING_RESCHEDULE,
90	/** Timer is destroyed but needs to be replaced from the
91	* active to the free list.
92	* Currently in the ScheduleTimers list and the active list. */
93	TMTIMERSTATE_PENDING_STOP_DESTROY,
94	/** Timer is destroyed but needs moving to the free list.
95	* Currently in the ScheduleTimers list. */
96	TMTIMERSTATE_PENDING_DESTROY,
97	/** Timer is free. */
98	TMTIMERSTATE_FREE
99	} TMTIMERSTATE;
100
101
102	/**
103	* Internal representation of a timer.
104	*
105	* For correct serialization (without the use of semaphores and
106	* other blocking/slow constructs) certain rules applies to updating
107	* this structure:
108	* - For thread other than EMT only u64Expire, enmState and pScheduleNext*
109	* are changeable. Everything else is out of bounds.
110	* - Updating of u64Expire timer can only happen in the TMTIMERSTATE_STOPPED
111	* and TMTIMERSTATE_PENDING_RESCHEDULING_SET_EXPIRE states.
112	* - Timers in the TMTIMERSTATE_EXPIRED state are only accessible from EMT.
113	* - Actual destruction of a timer can only be done at scheduling time.
114	*/
115	typedef struct TMTIMER
116	{
117	/** Expire time. */
118	volatile uint64_t u64Expire;
119	/** Clock to apply to u64Expire. */
120	TMCLOCK enmClock;
121	/** Timer callback type. */
122	TMTIMERTYPE enmType;
123	/** Type specific data. */
124	union
125	{
126	/** TMTIMERTYPE_DEV. */
127	struct
128	{
129	/** Callback. */
130	R3PTRTYPE(PFNTMTIMERDEV) pfnTimer;
131	/** Device instance. */
132	R3PTRTYPE(PPDMDEVINS) pDevIns;
133	} Dev;
134
135	/** TMTIMERTYPE_DRV. */
136	struct
137	{
138	/** Callback. */
139	R3PTRTYPE(PFNTMTIMERDRV) pfnTimer;
140	/** Device instance. */
141	R3PTRTYPE(PPDMDRVINS) pDrvIns;
142	} Drv;
143
144	/** TMTIMERTYPE_INTERNAL. */
145	struct
146	{
147	/** Callback. */
148	R3PTRTYPE(PFNTMTIMERINT) pfnTimer;
149	/** User argument. */
150	R3PTRTYPE(void *) pvUser;
151	} Internal;
152
153	/** TMTIMERTYPE_EXTERNAL. */
154	struct
155	{
156	/** Callback. */
157	R3PTRTYPE(PFNTMTIMEREXT) pfnTimer;
158	/** User data. */
159	R3PTRTYPE(void *) pvUser;
160	} External;
161	} u;
162
163	/** Timer state. */
164	volatile TMTIMERSTATE enmState;
165	/** Timer relative offset to the next timer in the schedule list. */
166	int32_t offScheduleNext;
167
168	/** Timer relative offset to the next timer in the chain. */
169	int32_t offNext;
170	/** Timer relative offset to the previous timer in the chain. */
171	int32_t offPrev;
172
173	/** Pointer to the next timer in the list of created or free timers. (TM::pTimers or TM::pFree) */
174	PTMTIMERR3 pBigNext;
175	/** Pointer to the previous timer in the list of all created timers. (TM::pTimers) */
176	PTMTIMERR3 pBigPrev;
177	/** Pointer to the timer description. */
178	HCPTRTYPE(const char *) pszDesc;
179	/** Pointer to the VM the timer belongs to - R3 Ptr. */
180	PVMR3 pVMR3;
181	/** Pointer to the VM the timer belongs to - R0 Ptr. */
182	PVMR0 pVMR0;
183	/** Pointer to the VM the timer belongs to - GC Ptr. */
184	PVMGC pVMGC;
185	#if HC_ARCH_BITS == 64 && GC_ARCH_BITS == 32
186	RTGCPTR padding0; /*< pad structure to multiple of 8 bytes. /
187	#endif
188	} TMTIMER;
189
190
191	/**
192	* Updates a timer state in the correct atomic manner.
193	*/
194	#if 1
195	# define TM_SET_STATE(pTimer, state) \
196	ASMAtomicXchgSize(&(pTimer)->enmState, state)
197	#else
198	# define TM_SET_STATE(pTimer, state) \
199	do { Log(("%s: %p: %d -> %d\n", __FUNCTION__, (pTimer), (pTimer)->enmState, state)); \
200	ASMAtomicXchgSize(&(pTimer)->enmState, state);\
201	} while (0)
202	#endif
203
204	/**
205	* Tries to updates a timer state in the correct atomic manner.
206	*/
207	#if 1
208	# define TM_TRY_SET_STATE(pTimer, StateNew, StateOld, fRc) \
209	ASMAtomicCmpXchgSize(&(pTimer)->enmState, StateNew, StateOld, fRc)
210	#else
211	# define TM_TRY_SET_STATE(pTimer, StateNew, StateOld, fRc) \
212	do { ASMAtomicCmpXchgSize(&(pTimer)->enmState, StateNew, StateOld, fRc); \
213	Log(("%s: %p: %d -> %d %RTbool\n", __FUNCTION__, (pTimer), StateOld, StateNew, fRc)); \
214	} while (0)
215	#endif
216
217	/** Get the previous timer. */
218	#define TMTIMER_GET_PREV(pTimer) ((PTMTIMER)((pTimer)->offPrev ? (intptr_t)(pTimer) + (pTimer)->offPrev : 0))
219	/** Get the next timer. */
220	#define TMTIMER_GET_NEXT(pTimer) ((PTMTIMER)((pTimer)->offNext ? (intptr_t)(pTimer) + (pTimer)->offNext : 0))
221	/** Set the previous timer link. */
222	#define TMTIMER_SET_PREV(pTimer, pPrev) ((pTimer)->offPrev = (pPrev) ? (intptr_t)(pPrev) - (intptr_t)(pTimer) : 0)
223	/** Set the next timer link. */
224	#define TMTIMER_SET_NEXT(pTimer, pNext) ((pTimer)->offNext = (pNext) ? (intptr_t)(pNext) - (intptr_t)(pTimer) : 0)
225
226
227	/**
228	* A timer queue.
229	*
230	* This is allocated on the hyper heap.
231	*/
232	typedef struct TMTIMERQUEUE
233	{
234	/** The cached expire time for this queue.
235	* Updated by EMT when scheduling the queue or modifying the head timer.
236	* Assigned UINT64_MAX when there is no head timer. */
237	uint64_t u64Expire;
238	/** Doubly linked list of active timers.
239	*
240	* When no scheduling is pending, this list is will be ordered by expire time (ascending).
241	* Access is serialized by only letting the emulation thread (EMT) do changes.
242	*
243	* The offset is relative to the queue structure.
244	*/
245	int32_t offActive;
246	/** List of timers pending scheduling of some kind.
247	*
248	* Timer stats allowed in the list are TMTIMERSTATE_PENDING_STOPPING,
249	* TMTIMERSTATE_PENDING_DESTRUCTION, TMTIMERSTATE_PENDING_STOPPING_DESTRUCTION,
250	* TMTIMERSTATE_PENDING_RESCHEDULING and TMTIMERSTATE_PENDING_SCHEDULE.
251	*
252	* The offset is relative to the queue structure.
253	*/
254	int32_t volatile offSchedule;
255	/** The clock for this queue. */
256	TMCLOCK enmClock;
257	/** Pad the structure up to 32 bytes. */
258	uint32_t au32Padding[3];
259	} TMTIMERQUEUE;
260
261	/** Pointer to a timer queue. */
262	typedef TMTIMERQUEUE *PTMTIMERQUEUE;
263
264	/** Get the head of the active timer list. */
265	#define TMTIMER_GET_HEAD(pQueue) ((PTMTIMER)((pQueue)->offActive ? (intptr_t)(pQueue) + (pQueue)->offActive : 0))
266	/** Set the head of the active timer list. */
267	#define TMTIMER_SET_HEAD(pQueue, pHead) ((pQueue)->offActive = pHead ? (intptr_t)pHead - (intptr_t)(pQueue) : 0)
268
269
270	/**
271	* Converts a TM pointer into a VM pointer.
272	* @returns Pointer to the VM structure the TM is part of.
273	* @param pTM Pointer to TM instance data.
274	*/
275	#define TM2VM(pTM) ( (PVM)((char*)pTM - pTM->offVM) )
276
277
278	/**
279	* TM VM Instance data.
280	* Changes to this must checked against the padding of the cfgm union in VM!
281	*/
282	typedef struct TM
283	{
284	/** Offset to the VM structure.
285	* See TM2VM(). */
286	RTUINT offVM;
287
288	/** CPU timestamp ticking enabled indicator (bool). (RDTSC) */
289	bool fTSCTicking;
290	/** Set if we fully virtualize the TSC, i.e. intercept all rdtsc instructions.
291	* Config variable: TSCVirtualized (bool) */
292	bool fTSCVirtualized;
293	/** Set if we use the real TSC as time source or if we use the virtual clock.
294	* If fTSCVirtualized is set we maintain a offset to the TSC and pausing/resuming the
295	* ticking. fTSCVirtualized = false implies fTSCUseRealTSC = true.
296	* Config variable: TSCUseRealTSC (bool) */
297	bool fTSCUseRealTSC;
298	/** The offset between the host TSC and the Guest TSC.
299	* Only valid if fTicking is set and and fTSCUseRealTSC is clear. */
300	uint64_t u64TSCOffset;
301	/** The guest TSC when fTicking is cleared. */
302	uint64_t u64TSC;
303	/** The number of CPU clock ticks per second (TMCLOCK_TSC).
304	* Config variable: TSCTicksPerSecond (64-bit unsigned int)
305	* The config variable implies fTSCVirtualized = true and fTSCUseRealTSC = false. */
306	uint64_t cTSCTicksPerSecond;
307
308	/** Virtual time ticking enabled indicator (bool). (TMCLOCK_VIRTUAL) */
309	bool fVirtualTicking;
310	/** Virtual time is not running at 100%. */
311	bool fVirtualWarpDrive;
312	/** Virtual timer synchronous time ticking enabled indicator (bool). (TMCLOCK_VIRTUAL_SYNC) */
313	bool volatile fVirtualSyncTicking;
314	/** Virtual timer synchronous time catch-up active. */
315	bool volatile fVirtualSyncCatchUp;
316	/** WarpDrive percentage.
317	* 100% is normal (fVirtualSyncNormal == true). When other than 100% we apply
318	* this percentage to the raw time source for the period it's been valid in,
319	* i.e. since u64VirtualWarpDriveStart. */
320	uint32_t u32VirtualWarpDrivePercentage;
321
322	/** The offset of the virtual clock relative to it's timesource.
323	* Only valid if fVirtualTicking is set. */
324	uint64_t u64VirtualOffset;
325	/** The guest virtual time when fVirtualTicking is cleared. */
326	uint64_t u64Virtual;
327	/** When the Warp drive was started or last adjusted.
328	* Only valid when fVirtualWarpDrive is set. */
329	uint64_t u64VirtualWarpDriveStart;
330
331	/** The guest virtual timer synchronous time when fVirtualSyncTicking is cleared. */
332	uint64_t volatile u64VirtualSync;
333	/** The offset of the timer synchronous virtual clock (TMCLOCK_VIRTUAL_SYNC) relative
334	* to the virtual clock (TMCLOCK_VIRTUAL).
335	* (This is accessed by the timer thread and must be updated atomically.) */
336	uint64_t volatile offVirtualSync;
337	/** The offset into offVirtualSync that's been irrevocably given up by failed catch-up attempts.
338	* Thus the current lag is offVirtualSync - offVirtualSyncGivenUp. */
339	uint64_t offVirtualSyncGivenUp;
340	/** The TMCLOCK_VIRTUAL at the previous TMVirtualGetSync call when catch-up is active. */
341	uint64_t volatile u64VirtualSyncCatchUpPrev;
342	/** The current catch-up percentage. */
343	uint32_t volatile u32VirtualSyncCatchUpPercentage;
344	/** How much slack when processing timers. */
345	uint32_t u32VirtualSyncScheduleSlack;
346	/** When to stop catch-up. */
347	uint64_t u64VirtualSyncCatchUpStopThreshold;
348	/** When to give up catch-up. */
349	uint64_t u64VirtualSyncCatchUpGiveUpThreshold;
350	/** @def TM_MAX_CATCHUP_PERIODS
351	* The number of catchup rates. */
352	#define TM_MAX_CATCHUP_PERIODS 10
353	/** The agressivness of the catch-up relative to how far we've lagged behind.
354	* The idea is to have increasing catch-up percentage as the lag increases. */
355	struct TMCATCHUPPERIOD
356	{
357	uint64_t u64Start; /*< When this period starts. (u64VirtualSyncOffset). /
358	uint32_t u32Percentage; /*< The catch-up percent to apply. /
359	uint32_t u32Alignment; /*< Structure alignment /
360	} aVirtualSyncCatchUpPeriods[TM_MAX_CATCHUP_PERIODS];
361
362	/** Timer queues for the different clock types - R3 Ptr */
363	R3PTRTYPE(PTMTIMERQUEUE) paTimerQueuesR3;
364	/** Timer queues for the different clock types - R0 Ptr */
365	R0PTRTYPE(PTMTIMERQUEUE) paTimerQueuesR0;
366	/** Timer queues for the different clock types - GC Ptr */
367	GCPTRTYPE(PTMTIMERQUEUE) paTimerQueuesGC;
368
369	/** Pointer to our GC mapping of the GIP. */
370	GCPTRTYPE(void *) pvGIPGC;
371	/** Pointer to our R3 mapping of the GIP. */
372	R3PTRTYPE(void *) pvGIPR3;
373
374	/** Pointer to a singly linked list of free timers.
375	* This chain is using the TMTIMER::pBigNext members.
376	* Only accessible from the emulation thread. */
377	PTMTIMERR3 pFree;
378
379	/** Pointer to a doubly linked list of created timers.
380	* This chain is using the TMTIMER::pBigNext and TMTIMER::pBigPrev members.
381	* Only accessible from the emulation thread. */
382	PTMTIMERR3 pCreated;
383
384	/** The schedulation timer timer handle (runtime timer).
385	* This timer will do freqent check on pending queue schedulations and
386	* raise VM_FF_TIMER to pull EMTs attention to them.
387	*/
388	HCPTRTYPE(PRTTIMER) pTimer;
389	/** Interval in milliseconds of the pTimer timer. */
390	uint32_t u32TimerMillies;
391
392	/** Alignment padding to ensure that the statistics are 64-bit aligned when using GCC. */
393	uint32_t u32Padding1;
394
395	/** TMR3TimerQueuesDo
396	* @{ */
397	STAMPROFILE StatDoQueues;
398	STAMPROFILEADV StatDoQueuesSchedule;
399	STAMPROFILEADV StatDoQueuesRun;
400	/** @} */
401	/** tmSchedule
402	* @{ */
403	STAMPROFILE StatScheduleOneGC;
404	STAMPROFILE StatScheduleOneR0;
405	STAMPROFILE StatScheduleOneR3;
406	STAMCOUNTER StatScheduleSetFF;
407	STAMCOUNTER StatPostponedR3;
408	STAMCOUNTER StatPostponedR0;
409	STAMCOUNTER StatPostponedGC;
410	/** @} */
411	/** Read the time
412	* @{ */
413	STAMCOUNTER StatVirtualGet;
414	STAMCOUNTER StatVirtualGetSetFF;
415	STAMCOUNTER StatVirtualGetSync;
416	STAMCOUNTER StatVirtualGetSyncSetFF;
417	STAMCOUNTER StatVirtualPause;
418	STAMCOUNTER StatVirtualResume;
419	/* @} */
420	/** TMTimerPoll
421	* @{ */
422	STAMCOUNTER StatPollAlreadySet;
423	STAMCOUNTER StatPollVirtual;
424	STAMCOUNTER StatPollVirtualSync;
425	STAMCOUNTER StatPollMiss;
426	/** @} */
427	/** TMTimerSet
428	* @{ */
429	STAMPROFILE StatTimerSetGC;
430	STAMPROFILE StatTimerSetR0;
431	STAMPROFILE StatTimerSetR3;
432	/** @} */
433	/** TMTimerStop
434	* @{ */
435	STAMPROFILE StatTimerStopGC;
436	STAMPROFILE StatTimerStopR0;
437	STAMPROFILE StatTimerStopR3;
438	/** @} */
439	/** VirtualSync - Running and Catching Up
440	* @{ */
441	STAMCOUNTER StatVirtualSyncRun;
442	STAMCOUNTER StatVirtualSyncRunRestart;
443	STAMPROFILE StatVirtualSyncRunSlack;
444	STAMCOUNTER StatVirtualSyncRunStop;
445	STAMCOUNTER StatVirtualSyncRunStoppedAlready;
446	STAMCOUNTER StatVirtualSyncGiveUp;
447	STAMCOUNTER StatVirtualSyncGiveUpBeforeStarting;
448	STAMPROFILEADV StatVirtualSyncCatchup;
449	STAMCOUNTER aStatVirtualSyncCatchupInitial[TM_MAX_CATCHUP_PERIODS];
450	STAMCOUNTER aStatVirtualSyncCatchupAdjust[TM_MAX_CATCHUP_PERIODS];
451	/** @} */
452	/** The timer callback. */
453	STAMCOUNTER StatTimerCallbackSetFF;
454
455	} TM;
456	/** Pointer to TM VM instance data. */
457	typedef TM *PTM;
458
459
460	const char *tmTimerState(TMTIMERSTATE enmState);
461	void tmTimerQueueSchedule(PVM pVM, PTMTIMERQUEUE pQueue);
462	#ifdef VBOX_STRICT
463	void tmTimerQueuesSanityChecks(PVM pVM, const char *pszWhere);
464	#endif
465
466	/** @} */
467
468	__END_DECLS
469
470	#endif
471

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