| 1 | /** @file
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| 2 | * PDM - Pluggable Device Manager, Block cache.
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2007-2023 Oracle and/or its affiliates.
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| 7 | *
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| 8 | * This file is part of VirtualBox base platform packages, as
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| 9 | * available from https://www.virtualbox.org.
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| 10 | *
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| 11 | * This program is free software; you can redistribute it and/or
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| 12 | * modify it under the terms of the GNU General Public License
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| 13 | * as published by the Free Software Foundation, in version 3 of the
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| 14 | * License.
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| 15 | *
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| 16 | * This program is distributed in the hope that it will be useful, but
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| 17 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 19 | * General Public License for more details.
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| 20 | *
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| 21 | * You should have received a copy of the GNU General Public License
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| 22 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 23 | *
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| 24 | * The contents of this file may alternatively be used under the terms
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| 25 | * of the Common Development and Distribution License Version 1.0
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| 26 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 27 | * in the VirtualBox distribution, in which case the provisions of the
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| 28 | * CDDL are applicable instead of those of the GPL.
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| 29 | *
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| 30 | * You may elect to license modified versions of this file under the
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| 31 | * terms and conditions of either the GPL or the CDDL or both.
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| 32 | *
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| 33 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 34 | */
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| 35 |
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| 36 | #ifndef VBOX_INCLUDED_vmm_pdmblkcache_h
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| 37 | #define VBOX_INCLUDED_vmm_pdmblkcache_h
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| 38 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 39 | # pragma once
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| 40 | #endif
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| 41 |
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| 42 | #include <VBox/types.h>
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| 43 | #include <iprt/sg.h>
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| 44 |
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| 45 |
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| 46 | RT_C_DECLS_BEGIN
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| 47 |
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| 48 | /** @defgroup grp_pdm_blk_cache The PDM Block Cache API
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| 49 | * @ingroup grp_pdm
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| 50 | * @{
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| 51 | */
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| 52 |
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| 53 | /** Pointer to a PDM block cache. */
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| 54 | typedef struct PDMBLKCACHE *PPDMBLKCACHE;
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| 55 | /** Pointer to a PDM block cache pointer. */
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| 56 | typedef PPDMBLKCACHE *PPPDMBLKCACHE;
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| 57 |
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| 58 | /** I/O transfer handle. */
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| 59 | typedef struct PDMBLKCACHEIOXFER *PPDMBLKCACHEIOXFER;
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| 60 |
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| 61 | /**
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| 62 | * Block cache I/O request transfer direction.
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| 63 | */
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| 64 | typedef enum PDMBLKCACHEXFERDIR
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| 65 | {
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| 66 | /** Read */
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| 67 | PDMBLKCACHEXFERDIR_READ = 0,
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| 68 | /** Write */
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| 69 | PDMBLKCACHEXFERDIR_WRITE,
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| 70 | /** Flush */
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| 71 | PDMBLKCACHEXFERDIR_FLUSH,
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| 72 | /** Discard */
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| 73 | PDMBLKCACHEXFERDIR_DISCARD
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| 74 | } PDMBLKCACHEXFERDIR;
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| 75 |
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| 76 | /**
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| 77 | * Completion callback for drivers.
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| 78 | *
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| 79 | * @param pDrvIns The driver instance.
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| 80 | * @param pvUser User argument given during request initiation.
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| 81 | * @param rc The status code of the completed request.
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| 82 | */
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| 83 | typedef DECLCALLBACKTYPE(void, FNPDMBLKCACHEXFERCOMPLETEDRV,(PPDMDRVINS pDrvIns, void *pvUser, int rc));
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| 84 | /** Pointer to a FNPDMBLKCACHEXFERCOMPLETEDRV(). */
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| 85 | typedef FNPDMBLKCACHEXFERCOMPLETEDRV *PFNPDMBLKCACHEXFERCOMPLETEDRV;
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| 86 |
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| 87 | /**
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| 88 | * I/O enqueue callback for drivers.
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| 89 | *
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| 90 | * @param pDrvIns The driver instance.
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| 91 | * @param enmXferDir Transfer direction.
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| 92 | * @param off Transfer offset.
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| 93 | * @param cbXfer Transfer size.
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| 94 | * @param pSgBuf Scather / gather buffer for the transfer.
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| 95 | * @param hIoXfer I/O transfer handle to ping on completion.
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| 96 | */
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| 97 | typedef DECLCALLBACKTYPE(int, FNPDMBLKCACHEXFERENQUEUEDRV,(PPDMDRVINS pDrvIns, PDMBLKCACHEXFERDIR enmXferDir, uint64_t off,
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| 98 | size_t cbXfer, PCRTSGBUF pSgBuf, PPDMBLKCACHEIOXFER hIoXfer));
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| 99 | /** Pointer to a FNPDMBLKCACHEXFERENQUEUEDRV(). */
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| 100 | typedef FNPDMBLKCACHEXFERENQUEUEDRV *PFNPDMBLKCACHEXFERENQUEUEDRV;
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| 101 |
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| 102 | /**
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| 103 | * Discard enqueue callback for drivers.
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| 104 | *
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| 105 | * @param pDrvIns The driver instance.
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| 106 | * @param paRanges Ranges to discard.
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| 107 | * @param cRanges Number of range entries.
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| 108 | * @param hIoXfer I/O handle to return on completion.
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| 109 | */
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| 110 | typedef DECLCALLBACKTYPE(int, FNPDMBLKCACHEXFERENQUEUEDISCARDDRV,(PPDMDRVINS pDrvIns, PCRTRANGE paRanges, unsigned cRanges,
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| 111 | PPDMBLKCACHEIOXFER hIoXfer));
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| 112 | /** Pointer to a FNPDMBLKCACHEXFERENQUEUEDISCARDDRV(). */
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| 113 | typedef FNPDMBLKCACHEXFERENQUEUEDISCARDDRV *PFNPDMBLKCACHEXFERENQUEUEDISCARDDRV;
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| 114 |
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| 115 | /**
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| 116 | * Completion callback for devices.
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| 117 | *
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| 118 | * @param pDevIns The device instance.
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| 119 | * @param pvUser User argument given during request initiation.
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| 120 | * @param rc The status code of the completed request.
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| 121 | */
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| 122 | typedef DECLCALLBACKTYPE(void, FNPDMBLKCACHEXFERCOMPLETEDEV,(PPDMDEVINS pDevIns, void *pvUser, int rc));
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| 123 | /** Pointer to a FNPDMBLKCACHEXFERCOMPLETEDEV(). */
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| 124 | typedef FNPDMBLKCACHEXFERCOMPLETEDEV *PFNPDMBLKCACHEXFERCOMPLETEDEV;
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| 125 |
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| 126 | /**
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| 127 | * I/O enqueue callback for devices.
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| 128 | *
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| 129 | * @param pDevIns The device instance.
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| 130 | * @param enmXferDir Transfer direction.
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| 131 | * @param off Transfer offset.
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| 132 | * @param cbXfer Transfer size.
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| 133 | * @param pSgBuf Scather / gather buffer for the transfer.
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| 134 | * @param hIoXfer I/O transfer handle to ping on completion.
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| 135 | */
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| 136 | typedef DECLCALLBACKTYPE(int, FNPDMBLKCACHEXFERENQUEUEDEV,(PPDMDEVINS pDevIns, PDMBLKCACHEXFERDIR enmXferDir, uint64_t off,
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| 137 | size_t cbXfer, PCRTSGBUF pSgBuf, PPDMBLKCACHEIOXFER hIoXfer));
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| 138 | /** Pointer to a FNPDMBLKCACHEXFERENQUEUEDEV(). */
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| 139 | typedef FNPDMBLKCACHEXFERENQUEUEDEV *PFNPDMBLKCACHEXFERENQUEUEDEV;
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| 140 |
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| 141 | /**
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| 142 | * Discard enqueue callback for devices.
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| 143 | *
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| 144 | * @param pDevIns The device instance.
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| 145 | * @param paRanges Ranges to discard.
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| 146 | * @param cRanges Number of range entries.
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| 147 | * @param hIoXfer I/O handle to return on completion.
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| 148 | */
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| 149 | typedef DECLCALLBACKTYPE(int, FNPDMBLKCACHEXFERENQUEUEDISCARDDEV,(PPDMDEVINS pDevIns, PCRTRANGE paRanges, unsigned cRanges,
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| 150 | PPDMBLKCACHEIOXFER hIoXfer));
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| 151 | /** Pointer to a FNPDMBLKCACHEXFERENQUEUEDISCARDDEV(). */
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| 152 | typedef FNPDMBLKCACHEXFERENQUEUEDISCARDDEV *PFNPDMBLKCACHEXFERENQUEUEDISCARDDEV;
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| 153 |
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| 154 | /**
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| 155 | * Completion callback for drivers.
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| 156 | *
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| 157 | * @param pvUserInt User argument given to PDMR3BlkCacheRetainInt.
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| 158 | * @param pvUser User argument given during request initiation.
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| 159 | * @param rc The status code of the completed request.
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| 160 | */
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| 161 | typedef DECLCALLBACKTYPE(void, FNPDMBLKCACHEXFERCOMPLETEINT,(void *pvUserInt, void *pvUser, int rc));
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| 162 | /** Pointer to a FNPDMBLKCACHEXFERCOMPLETEINT(). */
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| 163 | typedef FNPDMBLKCACHEXFERCOMPLETEINT *PFNPDMBLKCACHEXFERCOMPLETEINT;
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| 164 |
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| 165 | /**
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| 166 | * I/O enqueue callback for internal users.
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| 167 | *
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| 168 | * @param pvUser User data.
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| 169 | * @param enmXferDir Transfer direction.
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| 170 | * @param off Transfer offset.
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| 171 | * @param cbXfer Transfer size.
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| 172 | * @param pSgBuf Scather / gather buffer for the transfer.
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| 173 | * @param hIoXfer I/O transfer handle to ping on completion.
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| 174 | */
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| 175 | typedef DECLCALLBACKTYPE(int, FNPDMBLKCACHEXFERENQUEUEINT,(void *pvUser, PDMBLKCACHEXFERDIR enmXferDir, uint64_t off,
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| 176 | size_t cbXfer, PCRTSGBUF pSgBuf, PPDMBLKCACHEIOXFER hIoXfer));
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| 177 | /** Pointer to a FNPDMBLKCACHEXFERENQUEUEINT(). */
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| 178 | typedef FNPDMBLKCACHEXFERENQUEUEINT *PFNPDMBLKCACHEXFERENQUEUEINT;
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| 179 |
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| 180 | /**
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| 181 | * Discard enqueue callback for VMM internal users.
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| 182 | *
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| 183 | * @param pvUser User data.
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| 184 | * @param paRanges Ranges to discard.
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| 185 | * @param cRanges Number of range entries.
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| 186 | * @param hIoXfer I/O handle to return on completion.
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| 187 | */
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| 188 | typedef DECLCALLBACKTYPE(int, FNPDMBLKCACHEXFERENQUEUEDISCARDINT,(void *pvUser, PCRTRANGE paRanges, unsigned cRanges,
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| 189 | PPDMBLKCACHEIOXFER hIoXfer));
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| 190 | /** Pointer to a FNPDMBLKCACHEXFERENQUEUEDISCARDINT(). */
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| 191 | typedef FNPDMBLKCACHEXFERENQUEUEDISCARDINT *PFNPDMBLKCACHEXFERENQUEUEDISCARDINT;
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| 192 |
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| 193 | /**
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| 194 | * Completion callback for USB devices.
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| 195 | *
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| 196 | * @param pUsbIns The USB device instance.
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| 197 | * @param pvUser User argument given during request initiation.
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| 198 | * @param rc The status code of the completed request.
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| 199 | */
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| 200 | typedef DECLCALLBACKTYPE(void, FNPDMBLKCACHEXFERCOMPLETEUSB,(PPDMUSBINS pUsbIns, void *pvUser, int rc));
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| 201 | /** Pointer to a FNPDMBLKCACHEXFERCOMPLETEUSB(). */
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| 202 | typedef FNPDMBLKCACHEXFERCOMPLETEUSB *PFNPDMBLKCACHEXFERCOMPLETEUSB;
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| 203 |
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| 204 | /**
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| 205 | * I/O enqueue callback for USB devices.
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| 206 | *
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| 207 | * @param pUsbIns The USB device instance.
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| 208 | * @param enmXferDir Transfer direction.
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| 209 | * @param off Transfer offset.
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| 210 | * @param cbXfer Transfer size.
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| 211 | * @param pSgBuf Scather / gather buffer for the transfer.
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| 212 | * @param hIoXfer I/O transfer handle to ping on completion.
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| 213 | */
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| 214 | typedef DECLCALLBACKTYPE(int, FNPDMBLKCACHEXFERENQUEUEUSB,(PPDMUSBINS pUsbIns, PDMBLKCACHEXFERDIR enmXferDir, uint64_t off,
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| 215 | size_t cbXfer, PCRTSGBUF pSgBuf, PPDMBLKCACHEIOXFER hIoXfer));
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| 216 | /** Pointer to a FNPDMBLKCACHEXFERENQUEUEUSB(). */
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| 217 | typedef FNPDMBLKCACHEXFERENQUEUEUSB *PFNPDMBLKCACHEXFERENQUEUEUSB;
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| 218 |
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| 219 | /**
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| 220 | * Discard enqueue callback for USB devices.
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| 221 | *
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| 222 | * @param pUsbIns The USB device instance.
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| 223 | * @param paRanges Ranges to discard.
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| 224 | * @param cRanges Number of range entries.
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| 225 | * @param hIoXfer I/O handle to return on completion.
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| 226 | */
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| 227 | typedef DECLCALLBACKTYPE(int, FNPDMBLKCACHEXFERENQUEUEDISCARDUSB,(PPDMUSBINS pUsbIns, PCRTRANGE paRanges, unsigned cRanges,
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| 228 | PPDMBLKCACHEIOXFER hIoXfer));
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| 229 | /** Pointer to a FNPDMBLKCACHEXFERENQUEUEDISCARDUSB(). */
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| 230 | typedef FNPDMBLKCACHEXFERENQUEUEDISCARDUSB *PFNPDMBLKCACHEXFERENQUEUEDISCARDUSB;
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| 231 |
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| 232 | /**
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| 233 | * Create a block cache user for a driver instance.
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| 234 | *
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| 235 | * @returns VBox status code.
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| 236 | * @param pVM The cross context VM structure.
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| 237 | * @param pDrvIns The driver instance.
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| 238 | * @param ppBlkCache Where to store the handle to the block cache.
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| 239 | * @param pfnXferComplete The I/O transfer complete callback.
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| 240 | * @param pfnXferEnqueue The I/O request enqueue callback.
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| 241 | * @param pfnXferEnqueueDiscard The discard request enqueue callback.
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| 242 | * @param pcszId Unique ID used to identify the user.
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| 243 | */
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| 244 | VMMR3DECL(int) PDMR3BlkCacheRetainDriver(PVM pVM, PPDMDRVINS pDrvIns, PPPDMBLKCACHE ppBlkCache,
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| 245 | PFNPDMBLKCACHEXFERCOMPLETEDRV pfnXferComplete,
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| 246 | PFNPDMBLKCACHEXFERENQUEUEDRV pfnXferEnqueue,
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| 247 | PFNPDMBLKCACHEXFERENQUEUEDISCARDDRV pfnXferEnqueueDiscard,
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| 248 | const char *pcszId);
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| 249 |
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| 250 | /**
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| 251 | * Create a block cache user for a device instance.
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| 252 | *
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| 253 | * @returns VBox status code.
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| 254 | * @param pVM The cross context VM structure.
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| 255 | * @param pDevIns The device instance.
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| 256 | * @param ppBlkCache Where to store the handle to the block cache.
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| 257 | * @param pfnXferComplete The I/O transfer complete callback.
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| 258 | * @param pfnXferEnqueue The I/O request enqueue callback.
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| 259 | * @param pfnXferEnqueueDiscard The discard request enqueue callback.
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| 260 | * @param pcszId Unique ID used to identify the user.
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| 261 | */
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| 262 | VMMR3DECL(int) PDMR3BlkCacheRetainDevice(PVM pVM, PPDMDEVINS pDevIns, PPPDMBLKCACHE ppBlkCache,
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| 263 | PFNPDMBLKCACHEXFERCOMPLETEDEV pfnXferComplete,
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| 264 | PFNPDMBLKCACHEXFERENQUEUEDEV pfnXferEnqueue,
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| 265 | PFNPDMBLKCACHEXFERENQUEUEDISCARDDEV pfnXferEnqueueDiscard,
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| 266 | const char *pcszId);
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| 267 |
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| 268 | /**
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| 269 | * Create a block cache user for a USB instance.
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| 270 | *
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| 271 | * @returns VBox status code.
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| 272 | * @param pVM The cross context VM structure.
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| 273 | * @param pUsbIns The USB device instance.
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| 274 | * @param ppBlkCache Where to store the handle to the block cache.
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| 275 | * @param pfnXferComplete The I/O transfer complete callback.
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| 276 | * @param pfnXferEnqueue The I/O request enqueue callback.
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| 277 | * @param pfnXferEnqueueDiscard The discard request enqueue callback.
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| 278 | * @param pcszId Unique ID used to identify the user.
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| 279 | */
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| 280 | VMMR3DECL(int) PDMR3BlkCacheRetainUsb(PVM pVM, PPDMUSBINS pUsbIns, PPPDMBLKCACHE ppBlkCache,
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| 281 | PFNPDMBLKCACHEXFERCOMPLETEUSB pfnXferComplete,
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| 282 | PFNPDMBLKCACHEXFERENQUEUEUSB pfnXferEnqueue,
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| 283 | PFNPDMBLKCACHEXFERENQUEUEDISCARDUSB pfnXferEnqueueDiscard,
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| 284 | const char *pcszId);
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| 285 |
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| 286 | /**
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| 287 | * Create a block cache user for internal use by VMM.
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| 288 | *
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| 289 | * @returns VBox status code.
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| 290 | * @param pVM The cross context VM structure.
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| 291 | * @param pvUser Opaque user data.
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| 292 | * @param ppBlkCache Where to store the handle to the block cache.
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| 293 | * @param pfnXferComplete The I/O transfer complete callback.
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| 294 | * @param pfnXferEnqueue The I/O request enqueue callback.
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| 295 | * @param pfnXferEnqueueDiscard The discard request enqueue callback.
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| 296 | * @param pcszId Unique ID used to identify the user.
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| 297 | */
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| 298 | VMMR3DECL(int) PDMR3BlkCacheRetainInt(PVM pVM, void *pvUser, PPPDMBLKCACHE ppBlkCache,
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| 299 | PFNPDMBLKCACHEXFERCOMPLETEINT pfnXferComplete,
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| 300 | PFNPDMBLKCACHEXFERENQUEUEINT pfnXferEnqueue,
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| 301 | PFNPDMBLKCACHEXFERENQUEUEDISCARDINT pfnXferEnqueueDiscard,
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| 302 | const char *pcszId);
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| 303 |
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| 304 | /**
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| 305 | * Releases a block cache handle.
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| 306 | *
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| 307 | * @param pBlkCache Block cache handle.
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| 308 | */
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| 309 | VMMR3DECL(void) PDMR3BlkCacheRelease(PPDMBLKCACHE pBlkCache);
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| 310 |
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| 311 | /**
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| 312 | * Releases all block cache handles for a device instance.
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| 313 | *
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| 314 | * @param pVM The cross context VM structure.
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| 315 | * @param pDevIns The device instance.
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| 316 | */
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| 317 | VMMR3DECL(void) PDMR3BlkCacheReleaseDevice(PVM pVM, PPDMDEVINS pDevIns);
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| 318 |
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| 319 | /**
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| 320 | * Releases all block cache handles for a driver instance.
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| 321 | *
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| 322 | * @param pVM The cross context VM structure.
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| 323 | * @param pDrvIns The driver instance.
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| 324 | */
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| 325 | VMMR3DECL(void) PDMR3BlkCacheReleaseDriver(PVM pVM, PPDMDRVINS pDrvIns);
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| 326 |
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| 327 | /**
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| 328 | * Releases all block cache handles for a USB device instance.
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| 329 | *
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| 330 | * @param pVM The cross context VM structure.
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| 331 | * @param pUsbIns The USB device instance.
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| 332 | */
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| 333 | VMMR3DECL(void) PDMR3BlkCacheReleaseUsb(PVM pVM, PPDMUSBINS pUsbIns);
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| 334 |
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| 335 | /**
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| 336 | * Creates a read task on the given endpoint.
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| 337 | *
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| 338 | * @returns VBox status code.
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| 339 | * @param pBlkCache The cache instance.
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| 340 | * @param off Where to start reading from.
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| 341 | * @param pSgBuf Scatter gather buffer store the data in.
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| 342 | * @param cbRead The overall number of bytes to read.
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| 343 | * @param pvUser Opaque user data returned in the completion callback
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| 344 | * upon completion of the read.
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| 345 | */
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| 346 | VMMR3DECL(int) PDMR3BlkCacheRead(PPDMBLKCACHE pBlkCache, uint64_t off, PCRTSGBUF pSgBuf, size_t cbRead, void *pvUser);
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| 347 |
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| 348 | /**
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| 349 | * Creates a write task on the given endpoint.
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| 350 | *
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| 351 | * @returns VBox status code.
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| 352 | * @param pBlkCache The cache instance.
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| 353 | * @param off Where to start writing at.
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| 354 | * @param pSgBuf Scatter gather buffer gather the data from.
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| 355 | * @param cbWrite The overall number of bytes to write.
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| 356 | * @param pvUser Opaque user data returned in the completion callback
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| 357 | * upon completion of the task.
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| 358 | */
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| 359 | VMMR3DECL(int) PDMR3BlkCacheWrite(PPDMBLKCACHE pBlkCache, uint64_t off, PCRTSGBUF pSgBuf, size_t cbWrite, void *pvUser);
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| 360 |
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| 361 | /**
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| 362 | * Creates a flush task on the given endpoint.
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| 363 | *
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| 364 | * @returns VBox status code.
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| 365 | * @param pBlkCache The cache instance.
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| 366 | * @param pvUser Opaque user data returned in the completion callback
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| 367 | * upon completion of the task.
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| 368 | */
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| 369 | VMMR3DECL(int) PDMR3BlkCacheFlush(PPDMBLKCACHE pBlkCache, void *pvUser);
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| 370 |
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| 371 | /**
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| 372 | * Discards the given ranges from the cache.
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| 373 | *
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| 374 | * @returns VBox status code.
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| 375 | * @param pBlkCache The cache instance.
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| 376 | * @param paRanges Array of ranges to discard.
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| 377 | * @param cRanges Number of ranges in the array.
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| 378 | * @param pvUser Opaque user data returned in the completion callback
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| 379 | * upon completion of the task.
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| 380 | */
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| 381 | VMMR3DECL(int) PDMR3BlkCacheDiscard(PPDMBLKCACHE pBlkCache, PCRTRANGE paRanges, unsigned cRanges, void *pvUser);
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| 382 |
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| 383 | /**
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| 384 | * Notify the cache of a complete I/O transfer.
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| 385 | *
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| 386 | * @param pBlkCache The cache instance.
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| 387 | * @param hIoXfer The I/O transfer handle which completed.
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| 388 | * @param rcIoXfer The status code of the completed request.
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| 389 | */
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| 390 | VMMR3DECL(void) PDMR3BlkCacheIoXferComplete(PPDMBLKCACHE pBlkCache, PPDMBLKCACHEIOXFER hIoXfer, int rcIoXfer);
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| 391 |
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| 392 | /**
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| 393 | * Suspends the block cache.
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| 394 | *
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| 395 | * The cache waits until all I/O transfers completed and stops to enqueue new
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| 396 | * requests after the call returned but will not accept reads, write or flushes
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| 397 | * either.
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| 398 | *
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| 399 | * @returns VBox status code.
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| 400 | * @param pBlkCache The cache instance.
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| 401 | */
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| 402 | VMMR3DECL(int) PDMR3BlkCacheSuspend(PPDMBLKCACHE pBlkCache);
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| 403 |
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| 404 | /**
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| 405 | * Resumes operation of the block cache.
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| 406 | *
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| 407 | * @returns VBox status code.
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| 408 | * @param pBlkCache The cache instance.
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| 409 | */
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| 410 | VMMR3DECL(int) PDMR3BlkCacheResume(PPDMBLKCACHE pBlkCache);
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| 411 |
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| 412 | /**
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| 413 | * Clears the block cache and removes all entries.
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| 414 | *
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| 415 | * The cache waits until all I/O transfers completed.
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| 416 | *
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| 417 | * @returns VBox status code.
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| 418 | * @param pBlkCache The cache instance.
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| 419 | */
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| 420 | VMMR3DECL(int) PDMR3BlkCacheClear(PPDMBLKCACHE pBlkCache);
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| 421 |
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| 422 | /** @} */
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| 423 |
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| 424 | RT_C_DECLS_END
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| 425 |
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| 426 | #endif /* !VBOX_INCLUDED_vmm_pdmblkcache_h */
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| 427 |
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