PDMAsyncCompletion.cpp@ 22309

Last change on this file since 22309 was 22309, checked in by vboxsync, 15 years ago
PDMAsyncCompletion: Add first part of the cache for file I/O
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1	/* $Id: PDMAsyncCompletion.cpp 22309 2009-08-17 20:59:28Z vboxsync $ */
2	/** @file
3	* PDM Async I/O - Transport data asynchronous in R3 using EMT.
4	*/
5
6	/*
7	* Copyright (C) 2006-2008 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_PDM_ASYNC_COMPLETION
27	#include "PDMInternal.h"
28	#include <VBox/pdm.h>
29	#include <VBox/mm.h>
30	#include <VBox/rem.h>
31	#include <VBox/vm.h>
32	#include <VBox/err.h>
33
34	#include <VBox/log.h>
35	#include <iprt/asm.h>
36	#include <iprt/assert.h>
37	#include <iprt/thread.h>
38	#include <iprt/mem.h>
39	#include <iprt/critsect.h>
40	#include <iprt/tcp.h>
41
42	#include <VBox/pdmasynccompletion.h>
43	#include "PDMAsyncCompletionInternal.h"
44
45	/**
46	* Async I/O type.
47	*/
48	typedef enum PDMASYNCCOMPLETIONTEMPLATETYPE
49	{
50	/** Device . */
51	PDMASYNCCOMPLETIONTEMPLATETYPE_DEV = 1,
52	/** Driver consumer. */
53	PDMASYNCCOMPLETIONTEMPLATETYPE_DRV,
54	/** Internal consumer. */
55	PDMASYNCCOMPLETIONTEMPLATETYPE_INTERNAL,
56	/** Usb consumer. */
57	PDMASYNCCOMPLETIONTEMPLATETYPE_USB
58	} PDMASYNCTEMPLATETYPE;
59
60	/**
61	* PDM Async I/O template.
62	*/
63	typedef struct PDMASYNCCOMPLETIONTEMPLATE
64	{
65	/** Pointer to the next template in the list. */
66	R3PTRTYPE(PPDMASYNCCOMPLETIONTEMPLATE) pNext;
67	/** Pointer to the previous template in the list. */
68	R3PTRTYPE(PPDMASYNCCOMPLETIONTEMPLATE) pPrev;
69	/** Type specific data. */
70	union
71	{
72	/** PDMASYNCCOMPLETIONTEMPLATETYPE_DEV */
73	struct
74	{
75	/** Pointer to consumer function. */
76	R3PTRTYPE(PFNPDMASYNCCOMPLETEDEV) pfnCompleted;
77	/** Pointer to the device instance owning the template. */
78	R3PTRTYPE(PPDMDEVINS) pDevIns;
79	} Dev;
80	/** PDMASYNCCOMPLETIONTEMPLATETYPE_DRV */
81	struct
82	{
83	/** Pointer to consumer function. */
84	R3PTRTYPE(PFNPDMASYNCCOMPLETEDRV) pfnCompleted;
85	/** Pointer to the driver instance owning the template. */
86	R3PTRTYPE(PPDMDRVINS) pDrvIns;
87	/** User agument given during template creation.
88	* This is only here to make things much easier
89	* for DrVVD. */
90	void *pvTemplateUser;
91	} Drv;
92	/** PDMASYNCCOMPLETIONTEMPLATETYPE_INTERNAL */
93	struct
94	{
95	/** Pointer to consumer function. */
96	R3PTRTYPE(PFNPDMASYNCCOMPLETEINT) pfnCompleted;
97	/** Pointer to user data. */
98	R3PTRTYPE(void *) pvUser;
99	} Int;
100	/** PDMASYNCCOMPLETIONTEMPLATETYPE_USB */
101	struct
102	{
103	/** Pointer to consumer function. */
104	R3PTRTYPE(PFNPDMASYNCCOMPLETEUSB) pfnCompleted;
105	/** Pointer to the usb instance owning the template. */
106	R3PTRTYPE(PPDMUSBINS) pUsbIns;
107	} Usb;
108	} u;
109	/** Template type. */
110	PDMASYNCCOMPLETIONTEMPLATETYPE enmType;
111	/** Pointer to the VM. */
112	R3PTRTYPE(PVM) pVM;
113	/** Use count of the template. */
114	volatile uint32_t cUsed;
115	} PDMASYNCCOMPLETIONTEMPLATE;
116
117	static void pdmR3AsyncCompletionPutTask(PPDMASYNCCOMPLETIONENDPOINT pEndpoint, PPDMASYNCCOMPLETIONTASK pTask, bool fLocal);
118
119	/**
120	* Internal worker for the creation apis
121	*
122	* @returns VBox status.
123	* @param pVM VM handle.
124	* @param ppTemplate Where to store the template handle.
125	*/
126	static int pdmR3AsyncCompletionTemplateCreate(PVM pVM, PPPDMASYNCCOMPLETIONTEMPLATE ppTemplate, PDMASYNCCOMPLETIONTEMPLATETYPE enmType)
127	{
128	int rc = VINF_SUCCESS;
129
130	if (ppTemplate == NULL)
131	{
132	AssertMsgFailed(("ppTemplate is NULL\n"));
133	return VERR_INVALID_PARAMETER;
134	}
135
136	PPDMASYNCCOMPLETIONTEMPLATE pTemplate;
137	rc = MMR3HeapAllocZEx(pVM, MM_TAG_PDM_ASYNC_COMPLETION, sizeof(PDMASYNCCOMPLETIONTEMPLATE), (void **)&pTemplate);
138	if (RT_FAILURE(rc))
139	return rc;
140
141	/*
142	* Initialize fields.
143	*/
144	pTemplate->pVM = pVM;
145	pTemplate->cUsed = 0;
146	pTemplate->enmType = enmType;
147
148	/*
149	* Add template to the global VM template list.
150	*/
151	pTemplate->pNext = pVM->pdm.s.pAsyncCompletionTemplates;
152	if (pVM->pdm.s.pAsyncCompletionTemplates)
153	pVM->pdm.s.pAsyncCompletionTemplates->pPrev = pTemplate;
154	pVM->pdm.s.pAsyncCompletionTemplates = pTemplate;
155
156	*ppTemplate = pTemplate;
157	return VINF_SUCCESS;
158	}
159
160	/**
161	* Creates a async completion template for a device instance.
162	*
163	* The template is used when creating new completion tasks.
164	*
165	* @returns VBox status code.
166	* @param pVM Pointer to the shared VM structure.
167	* @param pDevIns The device instance.
168	* @param ppTemplate Where to store the template pointer on success.
169	* @param pfnCompleted The completion callback routine.
170	* @param pszDesc Description.
171	*/
172	VMMR3DECL(int) PDMR3AsyncCompletionTemplateCreateDevice(PVM pVM, PPDMDEVINS pDevIns, PPPDMASYNCCOMPLETIONTEMPLATE ppTemplate, PFNPDMASYNCCOMPLETEDEV pfnCompleted, const char *pszDesc)
173	{
174	LogFlow(("%s: pDevIns=%p ppTemplate=%p pfnCompleted=%p pszDesc=%s\n",
175	__FUNCTION__, pDevIns, ppTemplate, pfnCompleted, pszDesc));
176
177	/*
178	* Validate input.
179	*/
180	VM_ASSERT_EMT(pVM);
181	if (!pfnCompleted)
182	{
183	AssertMsgFailed(("No completion callback!\n"));
184	return VERR_INVALID_PARAMETER;
185	}
186
187	if (!ppTemplate)
188	{
189	AssertMsgFailed(("Template pointer is NULL!\n"));
190	return VERR_INVALID_PARAMETER;
191	}
192
193	/*
194	* Create the template.
195	*/
196	PPDMASYNCCOMPLETIONTEMPLATE pTemplate;
197	int rc = pdmR3AsyncCompletionTemplateCreate(pVM, &pTemplate, PDMASYNCCOMPLETIONTEMPLATETYPE_DEV);
198	if (RT_SUCCESS(rc))
199	{
200	pTemplate->u.Dev.pDevIns = pDevIns;
201	pTemplate->u.Dev.pfnCompleted = pfnCompleted;
202
203	*ppTemplate = pTemplate;
204	Log(("PDM: Created device template %p: pfnCompleted=%p pDevIns=%p\n",
205	pTemplate, pfnCompleted, pDevIns));
206	}
207
208	return rc;
209	}
210
211	/**
212	* Creates a async completion template for a driver instance.
213	*
214	* The template is used when creating new completion tasks.
215	*
216	* @returns VBox status code.
217	* @param pVM Pointer to the shared VM structure.
218	* @param pDrvIns The driver instance.
219	* @param ppTemplate Where to store the template pointer on success.
220	* @param pfnCompleted The completion callback routine.
221	* @param pvTemplateUser Template user argument
222	* @param pszDesc Description.
223	*/
224	VMMR3DECL(int) PDMR3AsyncCompletionTemplateCreateDriver(PVM pVM, PPDMDRVINS pDrvIns, PPPDMASYNCCOMPLETIONTEMPLATE ppTemplate, PFNPDMASYNCCOMPLETEDRV pfnCompleted, void pvTemplateUser, const char pszDesc)
225	{
226	LogFlow(("%s: pDrvIns=%p ppTemplate=%p pfnCompleted=%p pszDesc=%s\n",
227	__FUNCTION__, pDrvIns, ppTemplate, pfnCompleted, pszDesc));
228
229	/*
230	* Validate input.
231	*/
232	VM_ASSERT_EMT(pVM);
233	if (!pfnCompleted)
234	{
235	AssertMsgFailed(("No completion callback!\n"));
236	return VERR_INVALID_PARAMETER;
237	}
238
239	if (!ppTemplate)
240	{
241	AssertMsgFailed(("Template pointer is NULL!\n"));
242	return VERR_INVALID_PARAMETER;
243	}
244
245	/*
246	* Create the template.
247	*/
248	PPDMASYNCCOMPLETIONTEMPLATE pTemplate;
249	int rc = pdmR3AsyncCompletionTemplateCreate(pVM, &pTemplate, PDMASYNCCOMPLETIONTEMPLATETYPE_DRV);
250	if (RT_SUCCESS(rc))
251	{
252	pTemplate->u.Drv.pDrvIns = pDrvIns;
253	pTemplate->u.Drv.pfnCompleted = pfnCompleted;
254	pTemplate->u.Drv.pvTemplateUser = pvTemplateUser;
255
256	*ppTemplate = pTemplate;
257	Log(("PDM: Created driver template %p: pfnCompleted=%p pDrvIns=%p\n",
258	pTemplate, pfnCompleted, pDrvIns));
259	}
260
261	return rc;
262	}
263
264	/**
265	* Creates a async completion template for a USB device instance.
266	*
267	* The template is used when creating new completion tasks.
268	*
269	* @returns VBox status code.
270	* @param pVM Pointer to the shared VM structure.
271	* @param pUsbIns The USB device instance.
272	* @param ppTemplate Where to store the template pointer on success.
273	* @param pfnCompleted The completion callback routine.
274	* @param pszDesc Description.
275	*/
276	VMMR3DECL(int) PDMR3AsyncCompletionTemplateCreateUsb(PVM pVM, PPDMUSBINS pUsbIns, PPPDMASYNCCOMPLETIONTEMPLATE ppTemplate, PFNPDMASYNCCOMPLETEUSB pfnCompleted, const char *pszDesc)
277	{
278	LogFlow(("%s: pUsbIns=%p ppTemplate=%p pfnCompleted=%p pszDesc=%s\n",
279	__FUNCTION__, pUsbIns, ppTemplate, pfnCompleted, pszDesc));
280
281	/*
282	* Validate input.
283	*/
284	VM_ASSERT_EMT(pVM);
285	if (!pfnCompleted)
286	{
287	AssertMsgFailed(("No completion callback!\n"));
288	return VERR_INVALID_PARAMETER;
289	}
290
291	if (!ppTemplate)
292	{
293	AssertMsgFailed(("Template pointer is NULL!\n"));
294	return VERR_INVALID_PARAMETER;
295	}
296
297	/*
298	* Create the template.
299	*/
300	PPDMASYNCCOMPLETIONTEMPLATE pTemplate;
301	int rc = pdmR3AsyncCompletionTemplateCreate(pVM, &pTemplate, PDMASYNCCOMPLETIONTEMPLATETYPE_USB);
302	if (RT_SUCCESS(rc))
303	{
304	pTemplate->u.Usb.pUsbIns = pUsbIns;
305	pTemplate->u.Usb.pfnCompleted = pfnCompleted;
306
307	*ppTemplate = pTemplate;
308	Log(("PDM: Created usb template %p: pfnCompleted=%p pDevIns=%p\n",
309	pTemplate, pfnCompleted, pUsbIns));
310	}
311
312	return rc;
313	}
314
315	/**
316	* Creates a async completion template for internally by the VMM.
317	*
318	* The template is used when creating new completion tasks.
319	*
320	* @returns VBox status code.
321	* @param pVM Pointer to the shared VM structure.
322	* @param ppTemplate Where to store the template pointer on success.
323	* @param pfnCompleted The completion callback routine.
324	* @param pvUser2 The 2nd user argument for the callback.
325	* @param pszDesc Description.
326	*/
327	VMMR3DECL(int) PDMR3AsyncCompletionTemplateCreateInternal(PVM pVM, PPPDMASYNCCOMPLETIONTEMPLATE ppTemplate, PFNPDMASYNCCOMPLETEINT pfnCompleted, void pvUser2, const char pszDesc)
328	{
329	LogFlow(("%s: ppTemplate=%p pfnCompleted=%p pvUser2=%p pszDesc=%s\n",
330	__FUNCTION__, ppTemplate, pfnCompleted, pvUser2, pszDesc));
331
332	/*
333	* Validate input.
334	*/
335	VM_ASSERT_EMT(pVM);
336	if (!pfnCompleted)
337	{
338	AssertMsgFailed(("No completion callback!\n"));
339	return VERR_INVALID_PARAMETER;
340	}
341
342	if (!ppTemplate)
343	{
344	AssertMsgFailed(("Template pointer is NULL!\n"));
345	return VERR_INVALID_PARAMETER;
346	}
347
348	/*
349	* Create the template.
350	*/
351	PPDMASYNCCOMPLETIONTEMPLATE pTemplate;
352	int rc = pdmR3AsyncCompletionTemplateCreate(pVM, &pTemplate, PDMASYNCCOMPLETIONTEMPLATETYPE_INTERNAL);
353	if (RT_SUCCESS(rc))
354	{
355	pTemplate->u.Int.pvUser = pvUser2;
356	pTemplate->u.Int.pfnCompleted = pfnCompleted;
357
358	*ppTemplate = pTemplate;
359	Log(("PDM: Created internal template %p: pfnCompleted=%p pvUser2=%p\n",
360	pTemplate, pfnCompleted, pvUser2));
361	}
362
363	return rc;
364	}
365
366	/**
367	* Destroys the specified async completion template.
368	*
369	* @returns VBox status codes:
370	* @retval VINF_SUCCESS on success.
371	* @retval VERR_PDM_ASYNC_TEMPLATE_BUSY if the template is still in use.
372	*
373	* @param pTemplate The template in question.
374	*/
375	VMMR3DECL(int) PDMR3AsyncCompletionTemplateDestroy(PPDMASYNCCOMPLETIONTEMPLATE pTemplate)
376	{
377	LogFlow(("%s: pTemplate=%p\n", __FUNCTION__, pTemplate));
378
379	if (!pTemplate)
380	{
381	AssertMsgFailed(("pTemplate is NULL!\n"));
382	return VERR_INVALID_PARAMETER;
383	}
384
385	/*
386	* Check if the template is still used.
387	*/
388	if (pTemplate->cUsed > 0)
389	{
390	AssertMsgFailed(("Template is still in use\n"));
391	return VERR_PDM_ASYNC_TEMPLATE_BUSY;
392	}
393
394	/*
395	* Unlink the template from the list.
396	*/
397	PVM pVM = pTemplate->pVM;
398	PPDMASYNCCOMPLETIONTEMPLATE pPrev = pTemplate->pPrev;
399	PPDMASYNCCOMPLETIONTEMPLATE pNext = pTemplate->pNext;
400
401	if (pPrev)
402	pPrev->pNext = pNext;
403	else
404	pVM->pdm.s.pAsyncCompletionTemplates = pNext;
405
406	if (pNext)
407	pNext->pPrev = pPrev;
408
409	/*
410	* Free the template.
411	*/
412	MMR3HeapFree(pTemplate);
413
414	return VINF_SUCCESS;
415	}
416
417	/**
418	* Destroys all the specified async completion templates for the given device instance.
419	*
420	* @returns VBox status codes:
421	* @retval VINF_SUCCESS on success.
422	* @retval VERR_PDM_ASYNC_TEMPLATE_BUSY if one or more of the templates are still in use.
423	*
424	* @param pVM Pointer to the shared VM structure.
425	* @param pDevIns The device instance.
426	*/
427	VMMR3DECL(int) PDMR3AsyncCompletionTemplateDestroyDevice(PVM pVM, PPDMDEVINS pDevIns)
428	{
429	LogFlow(("%s: pDevIns=%p\n", __FUNCTION__, pDevIns));
430
431	/*
432	* Validate input.
433	*/
434	if (!pDevIns)
435	return VERR_INVALID_PARAMETER;
436	VM_ASSERT_EMT(pVM);
437
438	/*
439	* Unlink it.
440	*/
441	PPDMASYNCCOMPLETIONTEMPLATE pTemplate = pVM->pdm.s.pAsyncCompletionTemplates;
442	while (pTemplate)
443	{
444	if ( pTemplate->enmType == PDMASYNCCOMPLETIONTEMPLATETYPE_DEV
445	&& pTemplate->u.Dev.pDevIns == pDevIns)
446	{
447	PPDMASYNCCOMPLETIONTEMPLATE pTemplateDestroy = pTemplate;
448	pTemplate = pTemplate->pNext;
449	int rc = PDMR3AsyncCompletionTemplateDestroy(pTemplateDestroy);
450	if (RT_FAILURE(rc))
451	return rc;
452	}
453	else
454	pTemplate = pTemplate->pNext;
455	}
456
457	return VINF_SUCCESS;
458	}
459
460	/**
461	* Destroys all the specified async completion templates for the given driver instance.
462	*
463	* @returns VBox status codes:
464	* @retval VINF_SUCCESS on success.
465	* @retval VERR_PDM_ASYNC_TEMPLATE_BUSY if one or more of the templates are still in use.
466	*
467	* @param pVM Pointer to the shared VM structure.
468	* @param pDrvIns The driver instance.
469	*/
470	VMMR3DECL(int) PDMR3AsyncCompletionTemplateDestroyDriver(PVM pVM, PPDMDRVINS pDrvIns)
471	{
472	LogFlow(("%s: pDevIns=%p\n", __FUNCTION__, pDrvIns));
473
474	/*
475	* Validate input.
476	*/
477	if (!pDrvIns)
478	return VERR_INVALID_PARAMETER;
479	VM_ASSERT_EMT(pVM);
480
481	/*
482	* Unlink it.
483	*/
484	PPDMASYNCCOMPLETIONTEMPLATE pTemplate = pVM->pdm.s.pAsyncCompletionTemplates;
485	while (pTemplate)
486	{
487	if ( pTemplate->enmType == PDMASYNCCOMPLETIONTEMPLATETYPE_DRV
488	&& pTemplate->u.Drv.pDrvIns == pDrvIns)
489	{
490	PPDMASYNCCOMPLETIONTEMPLATE pTemplateDestroy = pTemplate;
491	pTemplate = pTemplate->pNext;
492	int rc = PDMR3AsyncCompletionTemplateDestroy(pTemplateDestroy);
493	if (RT_FAILURE(rc))
494	return rc;
495	}
496	else
497	pTemplate = pTemplate->pNext;
498	}
499
500	return VINF_SUCCESS;
501	}
502
503	/**
504	* Destroys all the specified async completion templates for the given USB device instance.
505	*
506	* @returns VBox status codes:
507	* @retval VINF_SUCCESS on success.
508	* @retval VERR_PDM_ASYNC_TEMPLATE_BUSY if one or more of the templates are still in use.
509	*
510	* @param pVM Pointer to the shared VM structure.
511	* @param pUsbIns The USB device instance.
512	*/
513	VMMR3DECL(int) PDMR3AsyncCompletionTemplateDestroyUsb(PVM pVM, PPDMUSBINS pUsbIns)
514	{
515	LogFlow(("%s: pUsbIns=%p\n", __FUNCTION__, pUsbIns));
516
517	/*
518	* Validate input.
519	*/
520	if (!pUsbIns)
521	return VERR_INVALID_PARAMETER;
522	VM_ASSERT_EMT(pVM);
523
524	/*
525	* Unlink it.
526	*/
527	PPDMASYNCCOMPLETIONTEMPLATE pTemplate = pVM->pdm.s.pAsyncCompletionTemplates;
528	while (pTemplate)
529	{
530	if ( pTemplate->enmType == PDMASYNCCOMPLETIONTEMPLATETYPE_USB
531	&& pTemplate->u.Usb.pUsbIns == pUsbIns)
532	{
533	PPDMASYNCCOMPLETIONTEMPLATE pTemplateDestroy = pTemplate;
534	pTemplate = pTemplate->pNext;
535	int rc = PDMR3AsyncCompletionTemplateDestroy(pTemplateDestroy);
536	if (RT_FAILURE(rc))
537	return rc;
538	}
539	else
540	pTemplate = pTemplate->pNext;
541	}
542
543	return VINF_SUCCESS;
544	}
545
546	void pdmR3AsyncCompletionCompleteTask(PPDMASYNCCOMPLETIONTASK pTask)
547	{
548	LogFlow(("%s: pTask=%p\n", __FUNCTION__, pTask));
549
550	PPDMASYNCCOMPLETIONTEMPLATE pTemplate = pTask->pEndpoint->pTemplate;
551
552	switch (pTemplate->enmType)
553	{
554	case PDMASYNCCOMPLETIONTEMPLATETYPE_DEV:
555	{
556	pTemplate->u.Dev.pfnCompleted(pTemplate->u.Dev.pDevIns, pTask->pvUser);
557	break;
558	}
559	case PDMASYNCCOMPLETIONTEMPLATETYPE_DRV:
560	{
561	pTemplate->u.Drv.pfnCompleted(pTemplate->u.Drv.pDrvIns, pTemplate->u.Drv.pvTemplateUser, pTask->pvUser);
562	break;
563	}
564	case PDMASYNCCOMPLETIONTEMPLATETYPE_USB:
565	{
566	pTemplate->u.Usb.pfnCompleted(pTemplate->u.Usb.pUsbIns, pTask->pvUser);
567	break;
568	}
569	case PDMASYNCCOMPLETIONTEMPLATETYPE_INTERNAL:
570	{
571	pTemplate->u.Int.pfnCompleted(pTemplate->pVM, pTask->pvUser, pTemplate->u.Int.pvUser);
572	break;
573	}
574	default:
575	AssertMsgFailed(("Unknown template type!\n"));
576	}
577
578	pdmR3AsyncCompletionPutTask(pTask->pEndpoint, pTask, true);
579	}
580
581	/**
582	* Worker initializing a endpoint class.
583	*
584	* @returns VBox statis code.
585	* @param pVM Pointer to the shared VM instance data.
586	* @param pEpClass Pointer to the endpoint class structure.
587	* @param pCfgHandle Pointer to the the CFGM tree.
588	*/
589	int pdmR3AsyncCompletionEpClassInit(PVM pVM, PCPDMASYNCCOMPLETIONEPCLASSOPS pEpClassOps, PCFGMNODE pCfgHandle)
590	{
591	int rc = VINF_SUCCESS;
592
593	/* Validate input. */
594	if ( !pEpClassOps
595	\|\| (pEpClassOps->u32Version != PDMAC_EPCLASS_OPS_VERSION)
596	\|\| (pEpClassOps->u32VersionEnd != PDMAC_EPCLASS_OPS_VERSION))
597	AssertMsgFailedReturn(("Invalid endpoint class data\n"), VERR_VERSION_MISMATCH);
598
599	LogFlowFunc((": pVM=%p pEpClassOps=%p{%s}\n", pVM, pEpClassOps, pEpClassOps->pcszName));
600
601	/* Allocate global class data. */
602	PPDMASYNCCOMPLETIONEPCLASS pEndpointClass = NULL;
603
604	rc = MMR3HeapAllocZEx(pVM, MM_TAG_PDM_ASYNC_COMPLETION,
605	pEpClassOps->cbEndpointClassGlobal,
606	(void **)&pEndpointClass);
607	if (RT_SUCCESS(rc))
608	{
609	/* Initialize common data. */
610	pEndpointClass->pVM = pVM;
611	pEndpointClass->pEndpointOps = pEpClassOps;
612
613	rc = RTCritSectInit(&pEndpointClass->CritSect);
614	if (RT_SUCCESS(rc))
615	{
616	PCFGMNODE pCfgNodeClass = CFGMR3GetChild(pCfgHandle, pEpClassOps->pcszName);
617
618	/* Query the common CFGM options */
619	rc = CFGMR3QueryU32Def(pCfgNodeClass, "TaskCachePerEndpoint", &pEndpointClass->cEndpointCacheSize, 5);
620	AssertRCReturn(rc, rc);
621
622	rc = CFGMR3QueryU32Def(pCfgNodeClass, "TaskCachePerClass", &pEndpointClass->cEpClassCacheSize, 50);
623	AssertRCReturn(rc, rc);
624
625	/* Call the specific endpoint class initializer. */
626	rc = pEpClassOps->pfnInitialize(pEndpointClass, pCfgNodeClass);
627	if (RT_SUCCESS(rc))
628	{
629	AssertMsg(!pVM->pdm.s.papAsyncCompletionEndpointClass[pEpClassOps->enmClassType],
630	("Endpoint class was already initialized\n"));
631
632	pVM->pdm.s.papAsyncCompletionEndpointClass[pEpClassOps->enmClassType] = pEndpointClass;
633	LogFlowFunc((": Initialized endpoint class \"%s\" rc=%Rrc\n", pEpClassOps->pcszName, rc));
634	return VINF_SUCCESS;
635	}
636	RTCritSectDelete(&pEndpointClass->CritSect);
637	}
638	MMR3HeapFree(pEndpointClass);
639	}
640
641	LogFlowFunc((": Failed to initialize endpoint class rc=%Rrc\n", rc));
642
643	return rc;
644	}
645
646	/**
647	* Worker terminating all endpoint classes.
648	*
649	* @returns nothing
650	* @param pEndpointClass Pointer to the endpoint class to terminate.
651	*
652	* @remarks This method ensures that any still open endpoint is closed.
653	*/
654	static void pdmR3AsyncCompletionEpClassTerminate(PPDMASYNCCOMPLETIONEPCLASS pEndpointClass)
655	{
656	int rc = VINF_SUCCESS;
657	PVM pVM = pEndpointClass->pVM;
658
659	/* Close all still open endpoints. */
660	while (pEndpointClass->pEndpointsHead)
661	PDMR3AsyncCompletionEpClose(pEndpointClass->pEndpointsHead);
662
663	/* Destroy all cached tasks. */
664	for (unsigned i = 0; i < RT_ELEMENTS(pEndpointClass->apTaskCache); i++)
665	{
666	PPDMASYNCCOMPLETIONTASK pTask = pEndpointClass->apTaskCache[i];
667
668	while (pTask)
669	{
670	PPDMASYNCCOMPLETIONTASK pTaskFree = pTask;
671	pTask = pTask->pNext;
672	MMR3HeapFree(pTaskFree);
673	}
674	}
675
676	/* Call the termination callback of the class. */
677	pEndpointClass->pEndpointOps->pfnTerminate(pEndpointClass);
678
679	RTCritSectDelete(&pEndpointClass->CritSect);
680
681	/* Free the memory of the class finally and clear the entry in the class array. */
682	pVM->pdm.s.papAsyncCompletionEndpointClass[pEndpointClass->pEndpointOps->enmClassType] = NULL;
683	MMR3HeapFree(pEndpointClass);
684	}
685
686	/**
687	* Initialize the async completion manager.
688	*
689	* @returns VBox status code
690	* @param pVM Pointer to the shared VM structure.
691	*/
692	int pdmR3AsyncCompletionInit(PVM pVM)
693	{
694	int rc = VINF_SUCCESS;
695
696	LogFlowFunc((": pVM=%p\n", pVM));
697
698	VM_ASSERT_EMT(pVM);
699
700	do
701	{
702	/* Allocate array for global class data. */
703	rc = MMR3HeapAllocZEx(pVM, MM_TAG_PDM_ASYNC_COMPLETION,
704	sizeof(PPDMASYNCCOMPLETIONEPCLASS) * PDMASYNCCOMPLETIONEPCLASSTYPE_MAX,
705	(void **)&pVM->pdm.s.papAsyncCompletionEndpointClass);
706	if (RT_FAILURE(rc))
707	break;
708
709	PCFGMNODE pCfgRoot = CFGMR3GetRoot(pVM);
710	PCFGMNODE pCfgAsyncCompletion = CFGMR3GetChild(CFGMR3GetChild(pCfgRoot, "PDM"), "AsyncCompletion");
711
712	rc = pdmR3AsyncCompletionEpClassInit(pVM, &g_PDMAsyncCompletionEndpointClassFile, pCfgAsyncCompletion);
713	if (RT_FAILURE(rc))
714	break;
715
716	/* Put other classes here. */
717	} while (0);
718
719	LogFlowFunc((": pVM=%p rc=%Rrc\n", pVM, rc));
720
721	return rc;
722	}
723
724	/**
725	* Terminates the async completion manager.
726	*
727	* @returns VBox status code
728	* @param pVM Pointer to the shared VM structure.
729	*/
730	int pdmR3AsyncCompletionTerm(PVM pVM)
731	{
732	LogFlowFunc((": pVM=%p\n", pVM));
733
734	if (pVM->pdm.s.papAsyncCompletionEndpointClass)
735	{
736	pdmR3AsyncCompletionEpClassTerminate(pVM->pdm.s.papAsyncCompletionEndpointClass[PDMASYNCCOMPLETIONEPCLASSTYPE_FILE]);
737	MMR3HeapFree(pVM->pdm.s.papAsyncCompletionEndpointClass);
738	}
739	return VINF_SUCCESS;
740	}
741
742	/**
743	* Tries to get a free task from the endpoint or class cache
744	* allocating the task if it fails.
745	*
746	* @returns Pointer to a new and initialized task or NULL
747	* @param pEndpoint The endpoint the task is for.
748	* @param pvUser Opaque user data for the task.
749	*/
750	static PPDMASYNCCOMPLETIONTASK pdmR3AsyncCompletionGetTask(PPDMASYNCCOMPLETIONENDPOINT pEndpoint, void *pvUser)
751	{
752	PPDMASYNCCOMPLETIONTASK pTask = NULL;
753
754	/* Try the small per endpoint cache first. */
755	uint32_t cTasksCached = ASMAtomicReadU32(&pEndpoint->cTasksCached);
756	if (cTasksCached == 0)
757	{
758	/* Try the bigger per endpoint class cache. */
759	PPDMASYNCCOMPLETIONEPCLASS pEndpointClass = pEndpoint->pEpClass;
760
761	/* We start with the assigned slot id to distribute the load when allocating new tasks. */
762	unsigned iSlot = pEndpoint->iSlotStart;
763	do
764	{
765	pTask = (PPDMASYNCCOMPLETIONTASK)ASMAtomicXchgPtr((void * volatile *)&pEndpointClass->apTaskCache[iSlot], NULL);
766	if (pTask)
767	break;
768
769	iSlot = (iSlot + 1) % RT_ELEMENTS(pEndpointClass->apTaskCache);
770	} while (iSlot != pEndpoint->iSlotStart);
771
772	if (!pTask)
773	{
774	/*
775	* Allocate completely new.
776	* If this fails we return NULL.
777	*/
778	int rc = MMR3HeapAllocZEx(pEndpointClass->pVM, MM_TAG_PDM_ASYNC_COMPLETION,
779	pEndpointClass->pEndpointOps->cbTask,
780	(void **)&pTask);
781	if (RT_FAILURE(rc))
782	pTask = NULL;
783	}
784	else
785	{
786	/* Remove the first element and put the rest into the slot again. */
787	PPDMASYNCCOMPLETIONTASK pTaskHeadNew = pTask->pNext;
788
789	/* Put back into the list adding any new tasks. */
790	while (true)
791	{
792	bool fChanged = ASMAtomicCmpXchgPtr((void * volatile *)&pEndpointClass->apTaskCache[iSlot], pTaskHeadNew, NULL);
793
794	if (fChanged)
795	break;
796
797	PPDMASYNCCOMPLETIONTASK pTaskHead = (PPDMASYNCCOMPLETIONTASK)ASMAtomicXchgPtr((void * volatile *)&pEndpointClass->apTaskCache[iSlot], NULL);
798
799	/* The new task could be taken inbetween */
800	if (pTaskHead)
801	{
802	/* Go to the end of the probably much shorter new list. */
803	PPDMASYNCCOMPLETIONTASK pTaskTail = pTaskHead;
804	while (pTaskTail->pNext)
805	pTaskTail = pTaskTail->pNext;
806
807	/* Concatenate */
808	pTaskTail->pNext = pTaskHeadNew;
809
810	pTaskHeadNew = pTaskHead;
811	}
812	/* Another round trying to change the list. */
813	}
814	/* We got a task from the global cache so decrement the counter */
815	ASMAtomicDecU32(&pEndpointClass->cTasksCached);
816	}
817	}
818	else
819	{
820	/* Grab a free task from the head. */
821	AssertMsg(pEndpoint->cTasksCached > 0, ("No tasks cached but list contain more than one element\n"));
822
823	pTask = pEndpoint->pTasksFreeHead;
824	pEndpoint->pTasksFreeHead = pTask->pNext;
825	ASMAtomicDecU32(&pEndpoint->cTasksCached);
826	}
827
828	if (RT_LIKELY(pTask))
829	{
830	/* Get ID of the task. */
831	pTask->uTaskId = ASMAtomicIncU32(&pEndpoint->uTaskIdNext);
832
833	/* Initialize common parts. */
834	pTask->pvUser = pvUser;
835	pTask->pEndpoint = pEndpoint;
836	/* Clear list pointers for safety. */
837	pTask->pPrev = NULL;
838	pTask->pNext = NULL;
839	}
840
841	return pTask;
842	}
843
844	/**
845	* Puts a task in one of the caches.
846	*
847	* @returns nothing.
848	* @param pEndpoint The endpoint the task belongs to.
849	* @param pTask The task to cache.
850	* @param fLocal Whether the per endpoint cache should be tried first.
851	*/
852	static void pdmR3AsyncCompletionPutTask(PPDMASYNCCOMPLETIONENDPOINT pEndpoint, PPDMASYNCCOMPLETIONTASK pTask, bool fLocal)
853	{
854	PPDMASYNCCOMPLETIONEPCLASS pEndpointClass = pEndpoint->pEpClass;
855
856	/* Check whether we can use the per endpoint cache */
857	if ( fLocal
858	&& (pEndpoint->cTasksCached < pEndpointClass->cEndpointCacheSize))
859	{
860	/* Add it to the list. */
861	pTask->pPrev = NULL;
862	pEndpoint->pTasksFreeTail->pNext = pTask;
863	pEndpoint->pTasksFreeTail = pTask;
864	ASMAtomicIncU32(&pEndpoint->cTasksCached);
865	}
866	else if (ASMAtomicReadU32(&pEndpoint->cTasksCached) < pEndpointClass->cEpClassCacheSize)
867	{
868	/* Use the global cache. */
869	ASMAtomicIncU32(&pEndpointClass->cTasksCached);
870
871	PPDMASYNCCOMPLETIONTASK pNext;
872	do
873	{
874	pNext = pEndpointClass->apTaskCache[pEndpoint->iSlotStart];
875	pTask->pNext = pNext;
876	} while (!ASMAtomicCmpXchgPtr((void * volatile )&pEndpointClass->apTaskCache[pEndpoint->iSlotStart], (void )pTask, (void *)pNext));
877	}
878	else
879	{
880	/* Free it */
881	MMR3HeapFree(pTask);
882	}
883	}
884
885	static PPDMASYNCCOMPLETIONENDPOINT pdmR3AsyncCompletionFindEndpointWithUri(PPDMASYNCCOMPLETIONEPCLASS pEndpointClass,
886	const char *pszUri)
887	{
888	PPDMASYNCCOMPLETIONENDPOINT pEndpoint = pEndpointClass->pEndpointsHead;
889
890	while (pEndpoint)
891	{
892	if (!RTStrCmp(pEndpoint->pszUri, pszUri))
893	return pEndpoint;
894
895	pEndpoint = pEndpoint->pNext;
896	}
897
898	return NULL;
899	}
900
901	VMMR3DECL(int) PDMR3AsyncCompletionEpCreateForFile(PPPDMASYNCCOMPLETIONENDPOINT ppEndpoint,
902	const char *pszFilename, uint32_t fFlags,
903	PPDMASYNCCOMPLETIONTEMPLATE pTemplate)
904	{
905	int rc = VINF_SUCCESS;
906
907	LogFlowFunc((": ppEndpoint=%p pszFilename=%p{%s} fFlags=%u pTemplate=%p\n",
908	ppEndpoint, pszFilename, pszFilename, fFlags, pTemplate));
909
910	/* Sanity checks. */
911	AssertReturn(VALID_PTR(ppEndpoint), VERR_INVALID_POINTER);
912	AssertReturn(VALID_PTR(pszFilename), VERR_INVALID_POINTER);
913	AssertReturn(VALID_PTR(pTemplate), VERR_INVALID_POINTER);
914
915	/* Check that the flags are valid. */
916	AssertReturn(((~(PDMACEP_FILE_FLAGS_READ_ONLY \| PDMACEP_FILE_FLAGS_CACHING) & fFlags) == 0),
917	VERR_INVALID_PARAMETER);
918
919	PVM pVM = pTemplate->pVM;
920	PPDMASYNCCOMPLETIONEPCLASS pEndpointClass = pVM->pdm.s.papAsyncCompletionEndpointClass[PDMASYNCCOMPLETIONEPCLASSTYPE_FILE];
921	PPDMASYNCCOMPLETIONENDPOINT pEndpoint = NULL;
922
923	AssertMsg(pEndpointClass, ("File endpoint class was not initialized\n"));
924
925	/* Search for a already opened endpoint for this file. */
926	pEndpoint = pdmR3AsyncCompletionFindEndpointWithUri(pEndpointClass, pszFilename);
927
928	if(!pEndpoint)
929	{
930	rc = MMR3HeapAllocZEx(pVM, MM_TAG_PDM_ASYNC_COMPLETION,
931	pEndpointClass->pEndpointOps->cbEndpoint,
932	(void **)&pEndpoint);
933	if (RT_SUCCESS(rc))
934	{
935
936	/* Initialize common parts. */
937	pEndpoint->pNext = NULL;
938	pEndpoint->pPrev = NULL;
939	pEndpoint->pEpClass = pEndpointClass;
940	pEndpoint->pTasksFreeHead = NULL;
941	pEndpoint->pTasksFreeTail = NULL;
942	pEndpoint->cTasksCached = 0;
943	pEndpoint->uTaskIdNext = 0;
944	pEndpoint->fTaskIdWraparound = false;
945	pEndpoint->pTemplate = pTemplate;
946	pEndpoint->iSlotStart = pEndpointClass->cEndpoints % RT_ELEMENTS(pEndpointClass->apTaskCache);
947	pEndpoint->pszUri = RTStrDup(pszFilename);
948	pEndpoint->cUsers = 1;
949	if (pEndpoint->pszUri)
950	{
951	/* Init the cache. */
952	rc = MMR3HeapAllocZEx(pVM, MM_TAG_PDM_ASYNC_COMPLETION,
953	pEndpointClass->pEndpointOps->cbTask,
954	(void **)&pEndpoint->pTasksFreeHead);
955	if (RT_SUCCESS(rc))
956	{
957	pEndpoint->pTasksFreeTail = pEndpoint->pTasksFreeHead;
958
959	/* Call the initializer for the endpoint. */
960	rc = pEndpointClass->pEndpointOps->pfnEpInitialize(pEndpoint, pszFilename, fFlags);
961	if (RT_SUCCESS(rc))
962	{
963	/* Link it into the list of endpoints. */
964	rc = RTCritSectEnter(&pEndpointClass->CritSect);
965	AssertMsg(RT_SUCCESS(rc), ("Failed to enter critical section rc=%Rrc\n", rc));
966
967	pEndpoint->pNext = pEndpointClass->pEndpointsHead;
968	if (pEndpointClass->pEndpointsHead)
969	pEndpointClass->pEndpointsHead->pPrev = pEndpoint;
970
971	pEndpointClass->pEndpointsHead = pEndpoint;
972	pEndpointClass->cEndpoints++;
973
974	rc = RTCritSectLeave(&pEndpointClass->CritSect);
975	AssertMsg(RT_SUCCESS(rc), ("Failed to enter critical section rc=%Rrc\n", rc));
976
977	/* Reference the template. */
978	ASMAtomicIncU32(&pTemplate->cUsed);
979
980	*ppEndpoint = pEndpoint;
981
982	LogFlowFunc((": Created endpoint for %s: rc=%Rrc\n", pszFilename, rc));
983	return VINF_SUCCESS;
984	}
985	MMR3HeapFree(pEndpoint->pTasksFreeHead);
986	RTStrFree(pEndpoint->pszUri);
987	}
988	else
989	rc = VERR_NO_MEMORY;
990	}
991	MMR3HeapFree(pEndpoint);
992	}
993	}
994	else
995	{
996	/* Endpoint found. */
997	pEndpoint->cUsers++;
998
999	*ppEndpoint = pEndpoint;
1000	return VINF_SUCCESS;
1001	}
1002
1003	LogFlowFunc((": Creation of endpoint for %s failed: rc=%Rrc\n", pszFilename, rc));
1004
1005	return rc;
1006	}
1007
1008	VMMR3DECL(void) PDMR3AsyncCompletionEpClose(PPDMASYNCCOMPLETIONENDPOINT pEndpoint)
1009	{
1010	LogFlowFunc((": pEndpoint=%p\n", pEndpoint));
1011
1012	/* Sanity checks. */
1013	AssertReturnVoid(VALID_PTR(pEndpoint));
1014
1015	pEndpoint->cUsers--;
1016
1017	/* If the last user closed the endpoint we will free it. */
1018	if (!pEndpoint->cUsers)
1019	{
1020	PPDMASYNCCOMPLETIONEPCLASS pEndpointClass = pEndpoint->pEpClass;
1021	pEndpointClass->pEndpointOps->pfnEpClose(pEndpoint);
1022
1023	/* Free cached tasks. */
1024	PPDMASYNCCOMPLETIONTASK pTask = pEndpoint->pTasksFreeHead;
1025
1026	while (pTask)
1027	{
1028	PPDMASYNCCOMPLETIONTASK pTaskFree = pTask;
1029	pTask = pTask->pNext;
1030	MMR3HeapFree(pTaskFree);
1031	}
1032
1033	/* Drop reference from the template. */
1034	ASMAtomicDecU32(&pEndpoint->pTemplate->cUsed);
1035
1036	/* Unlink the endpoint from the list. */
1037	int rc = RTCritSectEnter(&pEndpointClass->CritSect);
1038	AssertMsg(RT_SUCCESS(rc), ("Failed to enter critical section rc=%Rrc\n", rc));
1039
1040	PPDMASYNCCOMPLETIONENDPOINT pEndpointNext = pEndpoint->pNext;
1041	PPDMASYNCCOMPLETIONENDPOINT pEndpointPrev = pEndpoint->pPrev;
1042
1043	if (pEndpointPrev)
1044	pEndpointPrev->pNext = pEndpointNext;
1045	else
1046	pEndpointClass->pEndpointsHead = pEndpointNext;
1047	if (pEndpointNext)
1048	pEndpointNext->pPrev = pEndpointPrev;
1049
1050	pEndpointClass->cEndpoints--;
1051
1052	rc = RTCritSectLeave(&pEndpointClass->CritSect);
1053	AssertMsg(RT_SUCCESS(rc), ("Failed to enter critical section rc=%Rrc\n", rc));
1054
1055	RTStrFree(pEndpoint->pszUri);
1056	MMR3HeapFree(pEndpoint);
1057	}
1058	}
1059
1060	VMMR3DECL(int) PDMR3AsyncCompletionEpRead(PPDMASYNCCOMPLETIONENDPOINT pEndpoint, RTFOFF off,
1061	PCPDMDATASEG paSegments, size_t cSegments,
1062	size_t cbRead, void *pvUser,
1063	PPPDMASYNCCOMPLETIONTASK ppTask)
1064	{
1065	int rc = VINF_SUCCESS;
1066
1067	AssertReturn(VALID_PTR(pEndpoint), VERR_INVALID_POINTER);
1068	AssertReturn(VALID_PTR(paSegments), VERR_INVALID_POINTER);
1069	AssertReturn(VALID_PTR(ppTask), VERR_INVALID_POINTER);
1070	AssertReturn(cSegments > 0, VERR_INVALID_PARAMETER);
1071	AssertReturn(cbRead > 0, VERR_INVALID_PARAMETER);
1072	AssertReturn(off >= 0, VERR_INVALID_PARAMETER);
1073
1074	PPDMASYNCCOMPLETIONTASK pTask;
1075
1076	pTask = pdmR3AsyncCompletionGetTask(pEndpoint, pvUser);
1077	if (!pTask)
1078	return VERR_NO_MEMORY;
1079
1080	rc = pEndpoint->pEpClass->pEndpointOps->pfnEpRead(pTask, pEndpoint, off,
1081	paSegments, cSegments, cbRead);
1082	if (RT_SUCCESS(rc))
1083	{
1084	*ppTask = pTask;
1085	}
1086	else
1087	pdmR3AsyncCompletionPutTask(pEndpoint, pTask, false);
1088
1089	return rc;
1090	}
1091
1092	VMMR3DECL(int) PDMR3AsyncCompletionEpWrite(PPDMASYNCCOMPLETIONENDPOINT pEndpoint, RTFOFF off,
1093	PCPDMDATASEG paSegments, size_t cSegments,
1094	size_t cbWrite, void *pvUser,
1095	PPPDMASYNCCOMPLETIONTASK ppTask)
1096	{
1097	int rc = VINF_SUCCESS;
1098
1099	AssertReturn(VALID_PTR(pEndpoint), VERR_INVALID_POINTER);
1100	AssertReturn(VALID_PTR(paSegments), VERR_INVALID_POINTER);
1101	AssertReturn(VALID_PTR(ppTask), VERR_INVALID_POINTER);
1102	AssertReturn(cSegments > 0, VERR_INVALID_PARAMETER);
1103	AssertReturn(cbWrite > 0, VERR_INVALID_PARAMETER);
1104	AssertReturn(off >= 0, VERR_INVALID_PARAMETER);
1105
1106	PPDMASYNCCOMPLETIONTASK pTask;
1107
1108	pTask = pdmR3AsyncCompletionGetTask(pEndpoint, pvUser);
1109	if (!pTask)
1110	return VERR_NO_MEMORY;
1111
1112	rc = pEndpoint->pEpClass->pEndpointOps->pfnEpWrite(pTask, pEndpoint, off,
1113	paSegments, cSegments, cbWrite);
1114	if (RT_SUCCESS(rc))
1115	{
1116	*ppTask = pTask;
1117	}
1118	else
1119	pdmR3AsyncCompletionPutTask(pEndpoint, pTask, false);
1120
1121	return rc;
1122	}
1123
1124	VMMR3DECL(int) PDMR3AsyncCompletionEpFlush(PPDMASYNCCOMPLETIONENDPOINT pEndpoint,
1125	void *pvUser,
1126	PPPDMASYNCCOMPLETIONTASK ppTask)
1127	{
1128	int rc = VINF_SUCCESS;
1129
1130	AssertReturn(VALID_PTR(pEndpoint), VERR_INVALID_POINTER);
1131	AssertReturn(VALID_PTR(ppTask), VERR_INVALID_POINTER);
1132
1133	PPDMASYNCCOMPLETIONTASK pTask;
1134
1135	pTask = pdmR3AsyncCompletionGetTask(pEndpoint, pvUser);
1136	if (!pTask)
1137	return VERR_NO_MEMORY;
1138
1139	rc = pEndpoint->pEpClass->pEndpointOps->pfnEpFlush(pTask, pEndpoint);
1140	if (RT_SUCCESS(rc))
1141	{
1142	*ppTask = pTask;
1143	}
1144	else
1145	pdmR3AsyncCompletionPutTask(pEndpoint, pTask, false);
1146
1147	return rc;
1148	}
1149
1150	VMMR3DECL(int) PDMR3AsyncCompletionEpGetSize(PPDMASYNCCOMPLETIONENDPOINT pEndpoint,
1151	uint64_t *pcbSize)
1152	{
1153	AssertReturn(VALID_PTR(pEndpoint), VERR_INVALID_POINTER);
1154	AssertReturn(VALID_PTR(pcbSize), VERR_INVALID_POINTER);
1155
1156	return pEndpoint->pEpClass->pEndpointOps->pfnEpGetSize(pEndpoint, pcbSize);
1157	}
1158
1159	VMMR3DECL(int) PDMR3AsyncCompletionTaskCancel(PPDMASYNCCOMPLETIONTASK pTask)
1160	{
1161	return VERR_NOT_IMPLEMENTED;
1162	}
1163

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source: vbox/trunk/src/VBox/VMM/PDMAsyncCompletion.cpp@ 22309

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