MMPagePool.cpp@ 11162

Last change on this file since 11162 was 8155, checked in by vboxsync, 17 years ago
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1	/* $Id: MMPagePool.cpp 8155 2008-04-18 15:16:47Z vboxsync $ */
2	/** @file
3	* MM - Memory Monitor(/Manager) - Page Pool.
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	* Header Files *
24	*******************************************************************************/
25	#define LOG_GROUP LOG_GROUP_MM_POOL
26	#include <VBox/mm.h>
27	#include <VBox/pgm.h>
28	#include <VBox/stam.h>
29	#include "MMInternal.h"
30	#include <VBox/vm.h>
31	#include <VBox/param.h>
32	#include <VBox/err.h>
33	#include <VBox/log.h>
34	#include <iprt/alloc.h>
35	#include <iprt/assert.h>
36	#define USE_INLINE_ASM_BIT_OPS
37	#ifdef USE_INLINE_ASM_BIT_OPS
38	# include <iprt/asm.h>
39	#endif
40	#include <iprt/string.h>
41
42
43
44	/*******************************************************************************
45	* Internal Functions *
46	*******************************************************************************/
47	#ifdef IN_RING3
48	static void * mmR3PagePoolAlloc(PMMPAGEPOOL pPool);
49	static void mmR3PagePoolFree(PMMPAGEPOOL pPool, void *pv);
50	#endif
51
52
53	/**
54	* Initializes the page pool
55	*
56	* @return VBox status.
57	* @param pVM VM handle.
58	* @thread The Emulation Thread.
59	*/
60	int mmR3PagePoolInit(PVM pVM)
61	{
62	AssertMsg(!pVM->mm.s.pPagePool, ("Already initialized!\n"));
63
64	/*
65	* Allocate the pool structures.
66	*/
67	AssertRelease(sizeof(pVM->mm.s.pPagePool) + sizeof(pVM->mm.s.pPagePoolLow) < PAGE_SIZE);
68	int rc = SUPPageAllocLocked(1, (void **)&pVM->mm.s.pPagePool);
69	if (VBOX_FAILURE(rc))
70	return rc;
71	memset(pVM->mm.s.pPagePool, 0, PAGE_SIZE);
72	pVM->mm.s.pPagePool->pVM = pVM;
73	STAM_REG(pVM, &pVM->mm.s.pPagePool->cPages, STAMTYPE_U32, "/MM/Page/Def/cPages", STAMUNIT_PAGES, "Number of pages in the default pool.");
74	STAM_REG(pVM, &pVM->mm.s.pPagePool->cFreePages, STAMTYPE_U32, "/MM/Page/Def/cFreePages", STAMUNIT_PAGES, "Number of free pages in the default pool.");
75	STAM_REG(pVM, &pVM->mm.s.pPagePool->cSubPools, STAMTYPE_U32, "/MM/Page/Def/cSubPools", STAMUNIT_COUNT, "Number of sub pools in the default pool.");
76	STAM_REG(pVM, &pVM->mm.s.pPagePool->cAllocCalls, STAMTYPE_COUNTER, "/MM/Page/Def/cAllocCalls", STAMUNIT_CALLS, "Number of MMR3PageAlloc() calls for the default pool.");
77	STAM_REG(pVM, &pVM->mm.s.pPagePool->cFreeCalls, STAMTYPE_COUNTER, "/MM/Page/Def/cFreeCalls", STAMUNIT_CALLS, "Number of MMR3PageFree()+MMR3PageFreeByPhys() calls for the default pool.");
78	STAM_REG(pVM, &pVM->mm.s.pPagePool->cToPhysCalls, STAMTYPE_COUNTER, "/MM/Page/Def/cToPhysCalls", STAMUNIT_CALLS, "Number of MMR3Page2Phys() calls for this pool.");
79	STAM_REG(pVM, &pVM->mm.s.pPagePool->cToVirtCalls, STAMTYPE_COUNTER, "/MM/Page/Def/cToVirtCalls", STAMUNIT_CALLS, "Number of MMR3PagePhys2Page()+MMR3PageFreeByPhys() calls for the default pool.");
80	STAM_REG(pVM, &pVM->mm.s.pPagePool->cErrors, STAMTYPE_COUNTER, "/MM/Page/Def/cErrors", STAMUNIT_ERRORS,"Number of errors for the default pool.");
81
82	pVM->mm.s.pPagePoolLow = pVM->mm.s.pPagePool + 1;
83	pVM->mm.s.pPagePoolLow->pVM = pVM;
84	pVM->mm.s.pPagePoolLow->fLow = true;
85	STAM_REG(pVM, &pVM->mm.s.pPagePoolLow->cPages, STAMTYPE_U32, "/MM/Page/Low/cPages", STAMUNIT_PAGES, "Number of pages in the <4GB pool.");
86	STAM_REG(pVM, &pVM->mm.s.pPagePoolLow->cFreePages, STAMTYPE_U32, "/MM/Page/Low/cFreePages", STAMUNIT_PAGES, "Number of free pages in the <4GB pool.");
87	STAM_REG(pVM, &pVM->mm.s.pPagePoolLow->cSubPools, STAMTYPE_U32, "/MM/Page/Low/cSubPools", STAMUNIT_COUNT, "Number of sub pools in the <4GB pool.");
88	STAM_REG(pVM, &pVM->mm.s.pPagePoolLow->cAllocCalls, STAMTYPE_COUNTER, "/MM/Page/Low/cAllocCalls", STAMUNIT_CALLS, "Number of MMR3PageAllocLow() calls for the <4GB pool.");
89	STAM_REG(pVM, &pVM->mm.s.pPagePoolLow->cFreeCalls, STAMTYPE_COUNTER, "/MM/Page/Low/cFreeCalls", STAMUNIT_CALLS, "Number of MMR3PageFreeLow()+MMR3PageFreeByPhys() calls for the <4GB pool.");
90	STAM_REG(pVM, &pVM->mm.s.pPagePoolLow->cToPhysCalls,STAMTYPE_COUNTER, "/MM/Page/Low/cToPhysCalls", STAMUNIT_CALLS, "Number of MMR3Page2Phys() calls for the <4GB pool.");
91	STAM_REG(pVM, &pVM->mm.s.pPagePoolLow->cToVirtCalls,STAMTYPE_COUNTER, "/MM/Page/Low/cToVirtCalls", STAMUNIT_CALLS, "Number of MMR3PagePhys2Page()+MMR3PageFreeByPhys() calls for the <4GB pool.");
92	STAM_REG(pVM, &pVM->mm.s.pPagePoolLow->cErrors, STAMTYPE_COUNTER, "/MM/Page/Low/cErrors", STAMUNIT_ERRORS,"Number of errors for the <4GB pool.");
93
94	/** @todo init a mutex? */
95	return VINF_SUCCESS;
96	}
97
98
99	/**
100	* Release all locks and free the allocated memory.
101	*
102	* @param pVM VM handle.
103	* @thread The Emulation Thread.
104	*/
105	void mmR3PagePoolTerm(PVM pVM)
106	{
107	if (pVM->mm.s.pPagePool)
108	{
109	/*
110	* Unlock all memory held by subpools and free the memory.
111	* (The MM Heap will free the memory used for internal stuff.)
112	*/
113	Assert(!pVM->mm.s.pPagePool->fLow);
114	PMMPAGESUBPOOL pSubPool = pVM->mm.s.pPagePool->pHead;
115	while (pSubPool)
116	{
117	int rc = SUPPageUnlock(pSubPool->pvPages);
118	AssertMsgRC(rc, ("SUPPageUnlock(%p) failed with rc=%d\n", pSubPool->pvPages, rc));
119	rc = SUPPageFree(pSubPool->pvPages, pSubPool->cPages);
120	AssertMsgRC(rc, ("SUPPageFree(%p) failed with rc=%d\n", pSubPool->pvPages, rc));
121	pSubPool->pvPages = NULL;
122
123	/* next */
124	pSubPool = pSubPool->pNext;
125	}
126	pVM->mm.s.pPagePool = NULL;
127	}
128
129	if (pVM->mm.s.pPagePoolLow)
130	{
131	/*
132	* Free the memory.
133	*/
134	Assert(pVM->mm.s.pPagePoolLow->fLow);
135	PMMPAGESUBPOOL pSubPool = pVM->mm.s.pPagePoolLow->pHead;
136	while (pSubPool)
137	{
138	int rc = SUPLowFree(pSubPool->pvPages, pSubPool->cPages);
139	AssertMsgRC(rc, ("SUPPageFree(%p) failed with rc=%d\n", pSubPool->pvPages, rc));
140	pSubPool->pvPages = NULL;
141
142	/* next */
143	pSubPool = pSubPool->pNext;
144	}
145	pVM->mm.s.pPagePoolLow = NULL;
146	}
147	}
148
149
150	/**
151	* Allocates a page from the page pool.
152	*
153	* @returns Pointer to allocated page(s).
154	* @returns NULL on failure.
155	* @param pPool Pointer to the page pool.
156	* @thread The Emulation Thread.
157	*/
158	DECLINLINE(void *) mmR3PagePoolAlloc(PMMPAGEPOOL pPool)
159	{
160	VM_ASSERT_EMT(pPool->pVM);
161	STAM_COUNTER_INC(&pPool->cAllocCalls);
162
163	/*
164	* Walk free list.
165	*/
166	if (pPool->pHeadFree)
167	{
168	PMMPAGESUBPOOL pSub = pPool->pHeadFree;
169	/* decrement free count and unlink if no more free entries. */
170	if (!--pSub->cPagesFree)
171	pPool->pHeadFree = pSub->pNextFree;
172	#ifdef VBOX_WITH_STATISTICS
173	pPool->cFreePages--;
174	#endif
175
176	/* find free spot in bitmap. */
177	#ifdef USE_INLINE_ASM_BIT_OPS
178	const int iPage = ASMBitFirstClear(pSub->auBitmap, pSub->cPages);
179	if (iPage >= 0)
180	{
181	Assert(!ASMBitTest(pSub->auBitmap, iPage));
182	ASMBitSet(pSub->auBitmap, iPage);
183	return (char )pSub->pvPages + PAGE_SIZE iPage;
184	}
185	#else
186	unsigned *pu = &pSub->auBitmap[0];
187	unsigned puEnd = &pSub->auBitmap[pSub->cPages / (sizeof(pSub->auBitmap) 8)];
188	while (pu < puEnd)
189	{
190	unsigned u;
191	if ((u = *pu) != ~0U)
192	{
193	unsigned iBit = 0;
194	unsigned uMask = 1;
195	while (iBit < sizeof(pSub->auBitmap[0]) * 8)
196	{
197	if (!(u & uMask))
198	{
199	*pu \|= uMask;
200	return (char *)pSub->pvPages
201	+ PAGE_SIZE * (iBit + ((char )pu - (char )&pSub->auBitmap[0]) * 8);
202	}
203	iBit++;
204	uMask <<= 1;
205	}
206	STAM_COUNTER_INC(&pPool->cErrors);
207	AssertMsgFailed(("how odd, expected to find a free bit in %#x, but didn't\n", u));
208	}
209	/* next */
210	pu++;
211	}
212	#endif
213	STAM_COUNTER_INC(&pPool->cErrors);
214	#ifdef VBOX_WITH_STATISTICS
215	pPool->cFreePages++;
216	#endif
217	AssertMsgFailed(("how strange, expected to find a free bit in %p, but didn't (%d pages supposed to be free!)\n", pSub, pSub->cPagesFree + 1));
218	}
219
220	/*
221	* Allocate new subpool.
222	*/
223	unsigned cPages = !pPool->fLow ? 128 : 32;
224	PMMPAGESUBPOOL pSub;
225	int rc = MMHyperAlloc(pPool->pVM,
226	RT_OFFSETOF(MMPAGESUBPOOL, auBitmap[cPages / (sizeof(pSub->auBitmap[0] * 8))])
227	+ (sizeof(SUPPAGE) + sizeof(MMPPLOOKUPHCPHYS)) * cPages
228	+ sizeof(MMPPLOOKUPHCPTR),
229	0,
230	MM_TAG_MM_PAGE,
231	(void **)&pSub);
232	if (VBOX_FAILURE(rc))
233	return NULL;
234
235	PSUPPAGE paPhysPages = (PSUPPAGE)&pSub->auBitmap[cPages / (sizeof(pSub->auBitmap[0]) * 8)];
236	Assert((uintptr_t)paPhysPages >= (uintptr_t)&pSub->auBitmap[1]);
237	if (!pPool->fLow)
238	{
239	/*
240	* Allocate and lock the pages.
241	*/
242	rc = SUPPageAlloc(cPages, &pSub->pvPages);
243	if (VBOX_SUCCESS(rc))
244	{
245	rc = SUPPageLock(pSub->pvPages, cPages, paPhysPages);
246	if (VBOX_FAILURE(rc))
247	{
248	SUPPageFree(pSub->pvPages, cPages);
249	rc = VMSetError(pPool->pVM, rc, RT_SRC_POS,
250	N_("Failed to lock host %zd bytes of memory (out of memory)"), (size_t)cPages << PAGE_SHIFT);
251	}
252	}
253	}
254	else
255	rc = SUPLowAlloc(cPages, &pSub->pvPages, NULL, paPhysPages);
256	if (VBOX_SUCCESS(rc))
257	{
258	/*
259	* Setup the sub structure and allocate the requested page.
260	*/
261	pSub->cPages = cPages;
262	pSub->cPagesFree= cPages - 1;
263	pSub->paPhysPages = paPhysPages;
264	memset(pSub->auBitmap, 0, cPages / 8);
265	/* allocate first page. */
266	pSub->auBitmap[0] \|= 1;
267	/* link into free chain. */
268	pSub->pNextFree = pPool->pHeadFree;
269	pPool->pHeadFree= pSub;
270	/* link into main chain. */
271	pSub->pNext = pPool->pHead;
272	pPool->pHead = pSub;
273	/* update pool statistics. */
274	pPool->cSubPools++;
275	pPool->cPages += cPages;
276	#ifdef VBOX_WITH_STATISTICS
277	pPool->cFreePages += cPages - 1;
278	#endif
279
280	/*
281	* Initialize the physical pages with backpointer to subpool.
282	*/
283	unsigned i = cPages;
284	while (i-- > 0)
285	{
286	AssertMsg(paPhysPages[i].Phys && !(paPhysPages[i].Phys & PAGE_OFFSET_MASK),
287	("i=%d Phys=%d\n", i, paPhysPages[i].Phys));
288	paPhysPages[i].uReserved = (RTHCUINTPTR)pSub;
289	}
290
291	/*
292	* Initialize the physical lookup record with backpointers to the physical pages.
293	*/
294	PMMPPLOOKUPHCPHYS paLookupPhys = (PMMPPLOOKUPHCPHYS)&paPhysPages[cPages];
295	i = cPages;
296	while (i-- > 0)
297	{
298	paLookupPhys[i].pPhysPage = &paPhysPages[i];
299	paLookupPhys[i].Core.Key = paPhysPages[i].Phys;
300	RTAvlHCPhysInsert(&pPool->pLookupPhys, &paLookupPhys[i].Core);
301	}
302
303	/*
304	* And the one record for virtual memory lookup.
305	*/
306	PMMPPLOOKUPHCPTR pLookupVirt = (PMMPPLOOKUPHCPTR)&paLookupPhys[cPages];
307	pLookupVirt->pSubPool = pSub;
308	pLookupVirt->Core.Key = pSub->pvPages;
309	RTAvlPVInsert(&pPool->pLookupVirt, &pLookupVirt->Core);
310
311	/* return allocated page (first). */
312	return pSub->pvPages;
313	}
314
315	MMR3HeapFree(pSub);
316	STAM_COUNTER_INC(&pPool->cErrors);
317	if (pPool->fLow)
318	VMSetError(pPool->pVM, rc, RT_SRC_POS,
319	N_("Failed to expand page pool for memory below 4GB. current size: %d pages"),
320	pPool->cPages);
321	AssertMsgFailed(("Failed to expand pool%s. rc=%Vrc poolsize=%d\n",
322	pPool->fLow ? " (<4GB)" : "", rc, pPool->cPages));
323	return NULL;
324	}
325
326
327	/**
328	* Frees a page from the page pool.
329	*
330	* @param pPool Pointer to the page pool.
331	* @param pv Pointer to the page to free.
332	* I.e. pointer returned by mmR3PagePoolAlloc().
333	* @thread The Emulation Thread.
334	*/
335	DECLINLINE(void) mmR3PagePoolFree(PMMPAGEPOOL pPool, void *pv)
336	{
337	VM_ASSERT_EMT(pPool->pVM);
338	STAM_COUNTER_INC(&pPool->cFreeCalls);
339
340	/*
341	* Lookup the virtual address.
342	*/
343	PMMPPLOOKUPHCPTR pLookup = (PMMPPLOOKUPHCPTR)RTAvlPVGetBestFit(&pPool->pLookupVirt, pv, false);
344	if ( !pLookup
345	\|\| (char )pv >= (char )pLookup->pSubPool->pvPages + (pLookup->pSubPool->cPages << PAGE_SHIFT)
346	)
347	{
348	STAM_COUNTER_INC(&pPool->cErrors);
349	AssertMsgFailed(("invalid pointer %p\n", pv));
350	return;
351	}
352
353	/*
354	* Free the page.
355	*/
356	PMMPAGESUBPOOL pSubPool = pLookup->pSubPool;
357	/* clear bitmap bit */
358	const unsigned iPage = ((char )pv - (char )pSubPool->pvPages) >> PAGE_SHIFT;
359	#ifdef USE_INLINE_ASM_BIT_OPS
360	Assert(ASMBitTest(pSubPool->auBitmap, iPage));
361	ASMBitClear(pSubPool->auBitmap, iPage);
362	#else
363	unsigned iBit = iPage % (sizeof(pSubPool->auBitmap[0]) * 8);
364	unsigned iIndex = iPage / (sizeof(pSubPool->auBitmap[0]) * 8);
365	pSubPool->auBitmap[iIndex] &= ~(1 << iBit);
366	#endif
367	/* update stats. */
368	pSubPool->cPagesFree++;
369	#ifdef VBOX_WITH_STATISTICS
370	pPool->cFreePages++;
371	#endif
372	if (pSubPool->cPagesFree == 1)
373	{
374	pSubPool->pNextFree = pPool->pHeadFree;
375	pPool->pHeadFree = pSubPool;
376	}
377	}
378
379
380	/**
381	* Allocates a page from the page pool.
382	*
383	* This function may returns pages which has physical addresses any
384	* where. If you require a page to be within the first 4GB of physical
385	* memory, use MMR3PageAllocLow().
386	*
387	* @returns Pointer to the allocated page page.
388	* @returns NULL on failure.
389	* @param pVM VM handle.
390	* @thread The Emulation Thread.
391	*/
392	MMR3DECL(void *) MMR3PageAlloc(PVM pVM)
393	{
394	return mmR3PagePoolAlloc(pVM->mm.s.pPagePool);
395	}
396
397
398	/**
399	* Allocates a page from the page pool and return its physical address.
400	*
401	* This function may returns pages which has physical addresses any
402	* where. If you require a page to be within the first 4GB of physical
403	* memory, use MMR3PageAllocLow().
404	*
405	* @returns Pointer to the allocated page page.
406	* @returns NIL_RTHCPHYS on failure.
407	* @param pVM VM handle.
408	* @thread The Emulation Thread.
409	*/
410	MMR3DECL(RTHCPHYS) MMR3PageAllocPhys(PVM pVM)
411	{
412	/** @todo optimize this, it's the most common case now. */
413	void *pv = mmR3PagePoolAlloc(pVM->mm.s.pPagePool);
414	if (pv)
415	return mmPagePoolPtr2Phys(pVM->mm.s.pPagePool, pv);
416	return NIL_RTHCPHYS;
417	}
418
419
420	/**
421	* Frees a page allocated from the page pool by MMR3PageAlloc() or
422	* MMR3PageAllocPhys().
423	*
424	* @param pVM VM handle.
425	* @param pvPage Pointer to the page.
426	* @thread The Emulation Thread.
427	*/
428	MMR3DECL(void) MMR3PageFree(PVM pVM, void *pvPage)
429	{
430	mmR3PagePoolFree(pVM->mm.s.pPagePool, pvPage);
431	}
432
433
434	/**
435	* Allocates a page from the low page pool.
436	*
437	* @returns Pointer to the allocated page.
438	* @returns NULL on failure.
439	* @param pVM VM handle.
440	* @thread The Emulation Thread.
441	*/
442	MMR3DECL(void *) MMR3PageAllocLow(PVM pVM)
443	{
444	return mmR3PagePoolAlloc(pVM->mm.s.pPagePoolLow);
445	}
446
447
448	/**
449	* Frees a page allocated from the page pool by MMR3PageAllocLow().
450	*
451	* @param pVM VM handle.
452	* @param pvPage Pointer to the page.
453	* @thread The Emulation Thread.
454	*/
455	MMR3DECL(void) MMR3PageFreeLow(PVM pVM, void *pvPage)
456	{
457	mmR3PagePoolFree(pVM->mm.s.pPagePoolLow, pvPage);
458	}
459
460
461	/**
462	* Free a page allocated from the page pool by physical address.
463	* This works for pages allocated by MMR3PageAlloc(), MMR3PageAllocPhys()
464	* and MMR3PageAllocLow().
465	*
466	* @param pVM VM handle.
467	* @param HCPhysPage The physical address of the page to be freed.
468	* @thread The Emulation Thread.
469	*/
470	MMR3DECL(void) MMR3PageFreeByPhys(PVM pVM, RTHCPHYS HCPhysPage)
471	{
472	void *pvPage = mmPagePoolPhys2Ptr(pVM->mm.s.pPagePool, HCPhysPage);
473	if (!pvPage)
474	pvPage = mmPagePoolPhys2Ptr(pVM->mm.s.pPagePoolLow, HCPhysPage);
475	if (pvPage)
476	mmR3PagePoolFree(pVM->mm.s.pPagePool, pvPage);
477	else
478	AssertMsgFailed(("Invalid address HCPhysPT=%#x\n", HCPhysPage));
479	}
480
481
482	/**
483	* Gets the HC pointer to the dummy page.
484	*
485	* The dummy page is used as a place holder to prevent potential bugs
486	* from doing really bad things to the system.
487	*
488	* @returns Pointer to the dummy page.
489	* @param pVM VM handle.
490	* @thread The Emulation Thread.
491	*/
492	MMR3DECL(void *) MMR3PageDummyHCPtr(PVM pVM)
493	{
494	VM_ASSERT_EMT(pVM);
495	if (!pVM->mm.s.pvDummyPage)
496	{
497	pVM->mm.s.pvDummyPage = mmR3PagePoolAlloc(pVM->mm.s.pPagePool);
498	AssertRelease(pVM->mm.s.pvDummyPage);
499	pVM->mm.s.HCPhysDummyPage = mmPagePoolPtr2Phys(pVM->mm.s.pPagePool, pVM->mm.s.pvDummyPage);
500	AssertRelease(!(pVM->mm.s.HCPhysDummyPage & ~X86_PTE_PAE_PG_MASK));
501	}
502	return pVM->mm.s.pvDummyPage;
503	}
504
505
506	/**
507	* Gets the HC Phys to the dummy page.
508	*
509	* The dummy page is used as a place holder to prevent potential bugs
510	* from doing really bad things to the system.
511	*
512	* @returns Pointer to the dummy page.
513	* @param pVM VM handle.
514	* @thread The Emulation Thread.
515	*/
516	MMR3DECL(RTHCPHYS) MMR3PageDummyHCPhys(PVM pVM)
517	{
518	VM_ASSERT_EMT(pVM);
519	if (!pVM->mm.s.pvDummyPage)
520	MMR3PageDummyHCPtr(pVM);
521	return pVM->mm.s.HCPhysDummyPage;
522	}
523

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source: vbox/trunk/src/VBox/VMM/MMPagePool.cpp@ 11162

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