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Diffstat (limited to 'include/VBox/vmm/pdmblkcache.h')
| -rw-r--r-- | include/VBox/vmm/pdmblkcache.h | 422 |
1 files changed, 422 insertions, 0 deletions
diff --git a/include/VBox/vmm/pdmblkcache.h b/include/VBox/vmm/pdmblkcache.h new file mode 100644 index 00000000..fc92bc4f --- /dev/null +++ b/include/VBox/vmm/pdmblkcache.h @@ -0,0 +1,422 @@ +/** @file + * PDM - Pluggable Device Manager, Block cache. + */ + +/* + * Copyright (C) 2007-2010 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + +#ifndef ___VBox_vmm_pdmblkcache_h +#define ___VBox_vmm_pdmblkcache_h + +#include <VBox/types.h> +#include <VBox/err.h> +#include <iprt/assert.h> +#include <iprt/sg.h> + + +RT_C_DECLS_BEGIN + +/** @defgroup grp_pdm_blk_cache The PDM Block Cache API + * @ingroup grp_pdm + * @{ + */ + +/** Pointer to a PDM block cache. */ +typedef struct PDMBLKCACHE *PPDMBLKCACHE; +/** Pointer to a PDM block cache pointer. */ +typedef PPDMBLKCACHE *PPPDMBLKCACHE; + +/** I/O transfer handle. */ +typedef struct PDMBLKCACHEIOXFER *PPDMBLKCACHEIOXFER; + +/** + * Block cache I/O request transfer direction. + */ +typedef enum PDMBLKCACHEXFERDIR +{ + /** Read */ + PDMBLKCACHEXFERDIR_READ = 0, + /** Write */ + PDMBLKCACHEXFERDIR_WRITE, + /** Flush */ + PDMBLKCACHEXFERDIR_FLUSH, + /** Discard */ + PDMBLKCACHEXFERDIR_DISCARD +} PDMBLKCACHEXFERDIR; + +/** + * Completion callback for drivers. + * + * @param pDrvIns The driver instance. + * @param pvUser User argument given during request initiation. + * @param rc The status code of the completed request. + */ +typedef DECLCALLBACK(void) FNPDMBLKCACHEXFERCOMPLETEDRV(PPDMDRVINS pDrvIns, void *pvUser, int rc); +/** Pointer to a FNPDMBLKCACHEXFERCOMPLETEDRV(). */ +typedef FNPDMBLKCACHEXFERCOMPLETEDRV *PFNPDMBLKCACHEXFERCOMPLETEDRV; + +/** + * I/O enqueue callback for drivers. + * + * @param pDrvIns The driver instance. + * @param pvUser User argument given during request initiation. + * @param rc The status code of the completed request. + */ +typedef DECLCALLBACK(int) FNPDMBLKCACHEXFERENQUEUEDRV(PPDMDRVINS pDrvIns, + PDMBLKCACHEXFERDIR enmXferDir, + uint64_t off, size_t cbXfer, + PCRTSGBUF pcSgBuf, PPDMBLKCACHEIOXFER hIoXfer); +/** Pointer to a FNPDMBLKCACHEXFERENQUEUEDRV(). */ +typedef FNPDMBLKCACHEXFERENQUEUEDRV *PFNPDMBLKCACHEXFERENQUEUEDRV; + +/** + * Discard enqueue callback for drivers. + * + * @param pDrvIns The driver instance. + * @param paRanges Ranges to discard. + * @param cRanges Number of range entries. + * @param hIoXfer I/O handle to return on completion. + */ +typedef DECLCALLBACK(int) FNPDMBLKCACHEXFERENQUEUEDISCARDDRV(PPDMDRVINS pDrvIns, + PCRTRANGE paRanges, unsigned cRanges, + PPDMBLKCACHEIOXFER hIoXfer); +/** Pointer to a FNPDMBLKCACHEXFERENQUEUEDISCARDDRV(). */ +typedef FNPDMBLKCACHEXFERENQUEUEDISCARDDRV *PFNPDMBLKCACHEXFERENQUEUEDISCARDDRV; + +/** + * Completion callback for devices. + * + * @param pDrvIns The device instance. + * @param pvUser User argument given during request initiation. + * @param rc The status code of the completed request. + */ +typedef DECLCALLBACK(void) FNPDMBLKCACHEXFERCOMPLETEDEV(PPDMDEVINS pDevIns, void *pvUser, int rc); +/** Pointer to a FNPDMBLKCACHEXFERCOMPLETEDEV(). */ +typedef FNPDMBLKCACHEXFERCOMPLETEDEV *PFNPDMBLKCACHEXFERCOMPLETEDEV; + +/** + * I/O enqueue callback for devices. + * + * @param pDevIns The device instance. + * @param pvUser User argument given during request initiation. + * @param rc The status code of the completed request. + */ +typedef DECLCALLBACK(int) FNPDMBLKCACHEXFERENQUEUEDEV(PPDMDEVINS pDevIns, + PDMBLKCACHEXFERDIR enmXferDir, + uint64_t off, size_t cbXfer, + PCRTSGBUF pcSgBuf, PPDMBLKCACHEIOXFER hIoXfer); +/** Pointer to a FNPDMBLKCACHEXFERENQUEUEDEV(). */ +typedef FNPDMBLKCACHEXFERENQUEUEDEV *PFNPDMBLKCACHEXFERENQUEUEDEV; + +/** + * Discard enqueue callback for devices. + * + * @param pDrvIns The driver instance. + * @param paRanges Ranges to discard. + * @param cRanges Number of range entries. + * @param hIoXfer I/O handle to return on completion. + */ +typedef DECLCALLBACK(int) FNPDMBLKCACHEXFERENQUEUEDISCARDDEV(PPDMDEVINS pDevIns, + PCRTRANGE paRanges, unsigned cRanges, + PPDMBLKCACHEIOXFER hIoXfer); +/** Pointer to a FNPDMBLKCACHEXFERENQUEUEDISCARDDEV(). */ +typedef FNPDMBLKCACHEXFERENQUEUEDISCARDDEV *PFNPDMBLKCACHEXFERENQUEUEDISCARDDEV; + +/** + * Completion callback for drivers. + * + * @param pDrvIns The driver instance. + * @param pvUser User argument given during request initiation. + * @param rc The status code of the completed request. + */ +typedef DECLCALLBACK(void) FNPDMBLKCACHEXFERCOMPLETEINT(void *pvUserInt, void *pvUser, int rc); +/** Pointer to a FNPDMBLKCACHEXFERCOMPLETEINT(). */ +typedef FNPDMBLKCACHEXFERCOMPLETEINT *PFNPDMBLKCACHEXFERCOMPLETEINT; + +/** + * I/O enqueue callback for drivers. + * + * @param pDrvIns The driver instance. + * @param pvUser User argument given during request initiation. + * @param rc The status code of the completed request. + */ +typedef DECLCALLBACK(int) FNPDMBLKCACHEXFERENQUEUEINT(void *pvUser, + PDMBLKCACHEXFERDIR enmXferDir, + uint64_t off, size_t cbXfer, + PCRTSGBUF pcSgBuf, PPDMBLKCACHEIOXFER hIoXfer); +/** Pointer to a FNPDMBLKCACHEXFERENQUEUEINT(). */ +typedef FNPDMBLKCACHEXFERENQUEUEINT *PFNPDMBLKCACHEXFERENQUEUEINT; + +/** + * Discard enqueue callback for VMM internal users. + * + * @param pDrvIns The driver instance. + * @param paRanges Ranges to discard. + * @param cRanges Number of range entries. + * @param hIoXfer I/O handle to return on completion. + */ +typedef DECLCALLBACK(int) FNPDMBLKCACHEXFERENQUEUEDISCARDINT(void *pvUser, + PCRTRANGE paRanges, unsigned cRanges, + PPDMBLKCACHEIOXFER hIoXfer); +/** Pointer to a FNPDMBLKCACHEXFERENQUEUEDISCARDINT(). */ +typedef FNPDMBLKCACHEXFERENQUEUEDISCARDINT *PFNPDMBLKCACHEXFERENQUEUEDISCARDINT; + +/** + * Completion callback for USB. + * + * @param pDrvIns The driver instance. + * @param pvUser User argument given during request initiation. + * @param rc The status code of the completed request. + */ +typedef DECLCALLBACK(void) FNPDMBLKCACHEXFERCOMPLETEUSB(PPDMUSBINS pUsbIns, void *pvUser, int rc); +/** Pointer to a FNPDMBLKCACHEXFERCOMPLETEUSB(). */ +typedef FNPDMBLKCACHEXFERCOMPLETEUSB *PFNPDMBLKCACHEXFERCOMPLETEUSB; + +/** + * I/O enqueue callback for drivers. + * + * @param pDrvIns The driver instance. + * @param pvUser User argument given during request initiation. + * @param rc The status code of the completed request. + */ +typedef DECLCALLBACK(int) FNPDMBLKCACHEXFERENQUEUEUSB(PPDMUSBINS pUsbIns, + PDMBLKCACHEXFERDIR enmXferDir, + uint64_t off, size_t cbXfer, + PCRTSGBUF pcSgBuf, PPDMBLKCACHEIOXFER hIoXfer); +/** Pointer to a FNPDMBLKCACHEXFERENQUEUEUSB(). */ +typedef FNPDMBLKCACHEXFERENQUEUEUSB *PFNPDMBLKCACHEXFERENQUEUEUSB; + +/** + * Discard enqueue callback for USB devices. + * + * @param pUsbIns The USB device instance. + * @param paRanges Ranges to discard. + * @param cRanges Number of range entries. + * @param hIoXfer I/O handle to return on completion. + */ +typedef DECLCALLBACK(int) FNPDMBLKCACHEXFERENQUEUEDISCARDUSB(PPDMUSBINS pUsbIns, + PCRTRANGE paRanges, unsigned cRanges, + PPDMBLKCACHEIOXFER hIoXfer); +/** Pointer to a FNPDMBLKCACHEXFERENQUEUEDISCARDUSB(). */ +typedef FNPDMBLKCACHEXFERENQUEUEDISCARDUSB *PFNPDMBLKCACHEXFERENQUEUEDISCARDUSB; + +/** + * Create a block cache user for a driver instance. + * + * @returns VBox status code. + * @param pVM Pointer to the shared VM structure. + * @param pDrvIns The driver instance. + * @param ppBlkCache Where to store the handle to the block cache. + * @param pfnXferComplete The I/O transfer complete callback. + * @param pfnXferEnqueue The I/O request enqueue callback. + * @param pfnXferEnqueueDiscard The discard request enqueue callback. + * @param pcszId Unique ID used to identify the user. + */ +VMMR3DECL(int) PDMR3BlkCacheRetainDriver(PVM pVM, PPDMDRVINS pDrvIns, PPPDMBLKCACHE ppBlkCache, + PFNPDMBLKCACHEXFERCOMPLETEDRV pfnXferComplete, + PFNPDMBLKCACHEXFERENQUEUEDRV pfnXferEnqueue, + PFNPDMBLKCACHEXFERENQUEUEDISCARDDRV pfnXferEnqueueDiscard, + const char *pcszId); + +/** + * Create a block cache user for a device instance. + * + * @returns VBox status code. + * @param pVM Pointer to the shared VM structure. + * @param pDevIns The device instance. + * @param ppBlkCache Where to store the handle to the block cache. + * @param pfnXferComplete The I/O transfer complete callback. + * @param pfnXferEnqueue The I/O request enqueue callback. + * @param pfnXferEnqueueDiscard The discard request enqueue callback. + * @param pcszId Unique ID used to identify the user. + */ +VMMR3DECL(int) PDMR3BlkCacheRetainDevice(PVM pVM, PPDMDEVINS pDevIns, PPPDMBLKCACHE ppBlkCache, + PFNPDMBLKCACHEXFERCOMPLETEDEV pfnXferComplete, + PFNPDMBLKCACHEXFERENQUEUEDEV pfnXferEnqueue, + PFNPDMBLKCACHEXFERENQUEUEDISCARDDEV pfnXferEnqueueDiscard, + const char *pcszId); + +/** + * Create a block cache user for a USB instance. + * + * @returns VBox status code. + * @param pVM Pointer to the shared VM structure. + * @param pUsbIns The USB device instance. + * @param ppBlkCache Where to store the handle to the block cache. + * @param pfnXferComplete The I/O transfer complete callback. + * @param pfnXferEnqueue The I/O request enqueue callback. + * @param pfnXferEnqueueDiscard The discard request enqueue callback. + * @param pcszId Unique ID used to identify the user. + */ +VMMR3DECL(int) PDMR3BlkCacheRetainUsb(PVM pVM, PPDMUSBINS pUsbIns, PPPDMBLKCACHE ppBlkCache, + PFNPDMBLKCACHEXFERCOMPLETEUSB pfnXferComplete, + PFNPDMBLKCACHEXFERENQUEUEUSB pfnXferEnqueue, + PFNPDMBLKCACHEXFERENQUEUEDISCARDUSB pfnXferEnqueueDiscard, + const char *pcszId); + +/** + * Create a block cache user for internal use by VMM. + * + * @returns VBox status code. + * @param pVM Pointer to the shared VM structure. + * @param pvUser Opaque user data. + * @param ppBlkCache Where to store the handle to the block cache. + * @param pfnXferComplete The I/O transfer complete callback. + * @param pfnXferEnqueue The I/O request enqueue callback. + * @param pfnXferEnqueueDiscard The discard request enqueue callback. + * @param pcszId Unique ID used to identify the user. + */ +VMMR3DECL(int) PDMR3BlkCacheRetainInt(PVM pVM, void *pvUser, PPPDMBLKCACHE ppBlkCache, + PFNPDMBLKCACHEXFERCOMPLETEINT pfnXferComplete, + PFNPDMBLKCACHEXFERENQUEUEINT pfnXferEnqueue, + PFNPDMBLKCACHEXFERENQUEUEDISCARDINT pfnXferEnqueueDiscard, + const char *pcszId); + +/** + * Releases a block cache handle. + * + * @returns nothing. + * @param pBlkCache Block cache handle. + */ +VMMR3DECL(void) PDMR3BlkCacheRelease(PPDMBLKCACHE pBlkCache); + +/** + * Releases all block cache handles for a device instance. + * + * @returns nothing. + * @param pVM Pointer to the shared VM structure. + * @param pDevIns The device instance. + */ +VMMR3DECL(void) PDMR3BlkCacheReleaseDevice(PVM pVM, PPDMDEVINS pDevIns); + +/** + * Releases all block cache handles for a driver instance. + * + * @returns nothing. + * @param pVM Pointer to the shared VM structure. + * @param pDrvIns The driver instance. + */ +VMMR3DECL(void) PDMR3BlkCacheReleaseDriver(PVM pVM, PPDMDRVINS pDrvIns); + +/** + * Releases all block cache handles for a USB device instance. + * + * @returns nothing. + * @param pVM Pointer to the shared VM structure. + * @param pUsbIns The USB device instance. + */ +VMMR3DECL(void) PDMR3BlkCacheReleaseUsb(PVM pVM, PPDMUSBINS pUsbIns); + +/** + * Creates a read task on the given endpoint. + * + * @returns VBox status code. + * @param pEndpoint The file endpoint to read from. + * @param off Where to start reading from. + * @param paSegments Scatter gather list to store the data in. + * @param cSegments Number of segments in the list. + * @param cbRead The overall number of bytes to read. + * @param pvUser Opaque user data returned in the completion callback + * upon completion of the read. + */ +VMMR3DECL(int) PDMR3BlkCacheRead(PPDMBLKCACHE pBlkCache, uint64_t off, + PCRTSGBUF pcSgBuf, size_t cbRead, void *pvUser); + +/** + * Creates a write task on the given endpoint. + * + * @returns VBox status code. + * @param pEndpoint The file endpoint to write to. + * @param off Where to start writing at. + * @param paSegments Scatter gather list of the data to write. + * @param cSegments Number of segments in the list. + * @param cbWrite The overall number of bytes to write. + * @param pvUser Opaque user data returned in the completion callback + * upon completion of the task. + */ +VMMR3DECL(int) PDMR3BlkCacheWrite(PPDMBLKCACHE pBlkCache, uint64_t off, + PCRTSGBUF pcSgBuf, size_t cbWrite, void *pvUser); + +/** + * Creates a flush task on the given endpoint. + * + * @returns VBox status code. + * @param pEndpoint The file endpoint to flush. + * @param pvUser Opaque user data returned in the completion callback + * upon completion of the task. + */ +VMMR3DECL(int) PDMR3BlkCacheFlush(PPDMBLKCACHE pBlkCache, void *pvUser); + +/** + * Discards the given ranges from the cache. + * + * @returns VBox status code. + * @param pEndpoint The file endpoint to flush. + * @param paRanges Array of ranges to discard. + * @param cRanges Number of ranges in the array. + * @param pvUser Opaque user data returned in the completion callback + * upon completion of the task. + */ +VMMR3DECL(int) PDMR3BlkCacheDiscard(PPDMBLKCACHE pBlkCache, PCRTRANGE paRanges, unsigned cRanges, void *pvUser); + +/** + * Notify the cache of a complete I/O transfer. + * + * @returns nothing. + * @param pBlkCache The cache instance. + * @param hIoXfer The I/O transfer handle which completed. + * @param rcIoXfer The status code of the completed request. + */ +VMMR3DECL(void) PDMR3BlkCacheIoXferComplete(PPDMBLKCACHE pBlkCache, PPDMBLKCACHEIOXFER hIoXfer, int rcIoXfer); + +/** + * Suspends the block cache. The cache waits until all I/O transfers completed + * and stops to enqueue new requests after the call returned but will not accept + * reads, write or flushes either. + * + * @returns VBox status code. + * @param pBlkCache The cache instance. + */ +VMMR3DECL(int) PDMR3BlkCacheSuspend(PPDMBLKCACHE pBlkCache); + +/** + * Resumes operation of the block cache. + * + * @returns VBox status code. + * @param pBlkCache The cache instance. + */ +VMMR3DECL(int) PDMR3BlkCacheResume(PPDMBLKCACHE pBlkCache); + +/** + * Clears the block cache and removes all entries. The cache waits until all + * I/O transfers completed. + * + * @returns VBox status code. + * @param pBlkCache The cache instance. + */ +VMMR3DECL(int) PDMR3BlkCacheClear(PPDMBLKCACHE pBlkCache); + +/** @} */ + +RT_C_DECLS_END + +#endif + |