| 1 | /** @file
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| 2 | * IPRT Generic I/O queue API.
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2019 Oracle Corporation
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| 7 | *
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| 8 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 9 | * available from http://www.virtualbox.org. This file is free software;
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| 10 | * you can redistribute it and/or modify it under the terms of the GNU
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| 11 | * General Public License (GPL) as published by the Free Software
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| 12 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 13 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 14 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 15 | *
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| 16 | * The contents of this file may alternatively be used under the terms
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| 17 | * of the Common Development and Distribution License Version 1.0
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| 18 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 19 | * VirtualBox OSE distribution, in which case the provisions of the
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| 20 | * CDDL are applicable instead of those of the GPL.
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| 21 | *
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| 22 | * You may elect to license modified versions of this file under the
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| 23 | * terms and conditions of either the GPL or the CDDL or both.
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| 24 | */
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| 25 |
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| 26 | #ifndef IPRT_INCLUDED_ioqueue_h
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| 27 | #define IPRT_INCLUDED_ioqueue_h
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| 28 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 29 | # pragma once
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| 30 | #endif
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| 31 |
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| 32 | #include <iprt/types.h>
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| 33 | #include <iprt/sg.h>
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| 34 |
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| 35 | RT_C_DECLS_BEGIN
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| 36 |
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| 37 | /** @defgroup grp_rt_ioqueue IPRT generic I/O queue API
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| 38 | * @ingroup grp_rt
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| 39 | *
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| 40 | * This API models a generic I/O queue which can be attached to different providers
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| 41 | * for different types of handles.
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| 42 | *
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| 43 | * @{
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| 44 | */
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| 45 |
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| 46 |
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| 47 | /**
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| 48 | * I/O queue request operations.
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| 49 | */
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| 50 | typedef enum RTIOQUEUEOP
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| 51 | {
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| 52 | /** The usual invalid option. */
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| 53 | RTIOQUEUEOP_INVALID = 0,
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| 54 | /** Read request. */
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| 55 | RTIOQUEUEOP_READ,
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| 56 | /** Write request. */
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| 57 | RTIOQUEUEOP_WRITE,
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| 58 | /** Synchronize (i.e. flush) request. */
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| 59 | RTIOQUEUEOP_SYNC,
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| 60 | /** Usual 32bit hack. */
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| 61 | RTIOQUEUEOP_32BIT_HACK = 0x7fffffff
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| 62 | } RTIOQUEUEOP;
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| 63 | /** Pointer to a I/O queue operation code. */
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| 64 | typedef RTIOQUEUEOP *PRTIOQUEUEOP;
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| 65 |
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| 66 | /** I/O queue provider (processes requests put into the I/O queue) handle. */
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| 67 | typedef struct RTIOQUEUEPROVINT *RTIOQUEUEPROV;
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| 68 | /** I/O queue handle. */
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| 69 | typedef struct RTIOQUEUEINT *RTIOQUEUE;
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| 70 | /** Pointer to an I/O queue handle. */
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| 71 | typedef RTIOQUEUE *PRTIOQUEUE;
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| 72 | /** NIL I/O queue handle value. */
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| 73 | #define NIL_RTIOQUEUE ((RTIOQUEUE)0)
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| 74 |
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| 75 |
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| 76 | /**
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| 77 | * I/O queue completion event.
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| 78 | */
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| 79 | typedef struct RTIOQUEUECEVT
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| 80 | {
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| 81 | /** The user data passed when preparing the request. */
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| 82 | void *pvUser;
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| 83 | /** The IPRT status code for this request. */
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| 84 | int rcReq;
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| 85 | /** Transferred data size if applicaple by the request. */
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| 86 | size_t cbXfered;
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| 87 | } RTIOQUEUECEVT;
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| 88 | /** Pointer to a I/O queue completion event. */
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| 89 | typedef RTIOQUEUECEVT *PRTIOQUEUECEVT;
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| 90 | /** Pointer to a const I/O queue completion event. */
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| 91 | typedef const RTIOQUEUECEVT *PCRTIOQUEUECEVT;
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| 92 |
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| 93 |
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| 94 | /**
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| 95 | * I/O queue provider virtual method table.
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| 96 | */
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| 97 | typedef struct RTIOQUEUEPROVVTABLE
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| 98 | {
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| 99 | /** The structure version (RTIOQUEUEPROVVTABLE_VERSION). */
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| 100 | uint32_t uVersion;
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| 101 | /** Provider ID. */
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| 102 | const char *pszId;
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| 103 | /** Size of provider specific data for an I/O queue instance. */
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| 104 | size_t cbIoQueueProv;
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| 105 | /** The handle type the provider is able to process. */
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| 106 | RTHANDLETYPE enmHnd;
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| 107 | /** Additional flags for exposing supported features or quirks to the user. */
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| 108 | uint32_t fFlags;
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| 109 |
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| 110 | /**
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| 111 | * Returns whether the provider is supported on the calling host system.
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| 112 | *
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| 113 | * @returns Flag whether the provider is supported.
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| 114 | */
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| 115 | DECLCALLBACKMEMBER(bool, pfnIsSupported) (void);
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| 116 |
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| 117 | /**
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| 118 | * Initializes the provider specific parts of the given I/O queue.
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| 119 | *
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| 120 | * @returns IPRT status code.
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| 121 | * @param hIoQueueProv The I/O queue provider instance to initialize.
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| 122 | * @param fFlags Flags for the queue.
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| 123 | * @param cSqEntries Number of entries for the submission queue.
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| 124 | * @param cCqEntries Number of entries for the completion queue.
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| 125 | */
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| 126 | DECLCALLBACKMEMBER(int, pfnQueueInit) (RTIOQUEUEPROV hIoQueueProv, uint32_t fFlags,
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| 127 | uint32_t cSqEntries, uint32_t cCqEntries);
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| 128 |
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| 129 | /**
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| 130 | * Destroys the provider specific parts of the I/O queue and frees all
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| 131 | * associated resources.
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| 132 | *
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| 133 | * @returns nothing.
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| 134 | * @param hIoQueueProv The I/O queue provider instance to destroy.
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| 135 | */
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| 136 | DECLCALLBACKMEMBER(void, pfnQueueDestroy) (RTIOQUEUEPROV hIoQueueProv);
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| 137 |
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| 138 | /**
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| 139 | * Registers the given handle for use with the I/O queue instance.
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| 140 | * The generic code already checked for the correct handle type and that the
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| 141 | * handle wasn't registered already by tracking all registered handles.
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| 142 | *
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| 143 | * @returns IPRT status code.
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| 144 | * @param hIoQueueProv The I/O queue provider instance.
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| 145 | * @param pHandle The handle to register.
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| 146 | */
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| 147 | DECLCALLBACKMEMBER(int, pfnHandleRegister) (RTIOQUEUEPROV hIoQueueProv, PCRTHANDLE pHandle);
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| 148 |
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| 149 | /**
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| 150 | * Deregisters the given handle for use with the I/O queue instance.
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| 151 | * The generic code already checked for the correct handle type and that the
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| 152 | * handle was registered previously.
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| 153 | *
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| 154 | * @returns IPRT status code.
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| 155 | * @param hIoQueueProv The I/O queue provider instance.
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| 156 | * @param pHandle The handle to deregister.
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| 157 | */
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| 158 | DECLCALLBACKMEMBER(int, pfnHandleDeregister) (RTIOQUEUEPROV hIoQueueProv, PCRTHANDLE pHandle);
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| 159 |
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| 160 | /**
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| 161 | * Prepares a request for the given I/O queue.
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| 162 | *
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| 163 | * @returns IPRT status code.
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| 164 | * @param hIoQueueProv The I/O queue provider instance.
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| 165 | * @param pHandle The handle the request is for.
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| 166 | * @param enmOp The operation to perform.
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| 167 | * @param off Start offset (if applicable, not all handles support/require it and will ignore it).
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| 168 | * @param pvBuf Buffer to use for read/write operations (sync ignores this).
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| 169 | * @param cbBuf Size of the buffer in bytes.
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| 170 | * @param fReqFlags Additional flags for the request.
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| 171 | * @param pvUser Opaque user data which is passed back in the completion event.
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| 172 | */
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| 173 | DECLCALLBACKMEMBER(int, pfnReqPrepare) (RTIOQUEUEPROV hIoQueueProv, PCRTHANDLE pHandle, RTIOQUEUEOP enmOp,
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| 174 | uint64_t off, void *pvBuf, size_t cbBuf, uint32_t fReqFlags,
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| 175 | void *pvUser);
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| 176 |
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| 177 | /**
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| 178 | * Prepares a request for the given I/O queue.
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| 179 | *
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| 180 | * @returns IPRT status code.
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| 181 | * @param hIoQueueProv The I/O queue provider instance.
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| 182 | * @param pHandle The handle the request is for.
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| 183 | * @param enmOp The operation to perform.
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| 184 | * @param off Start offset (if applicable, not all handles support/require it and will ignore it).
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| 185 | * @param pSgBuf The S/G buufer to use for read/write operations (sync ignores this).
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| 186 | * @param cbSg Number of bytes to transfer from the S/G buffer.
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| 187 | * @param fReqFlags Additional flags for the request.
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| 188 | * @param pvUser Opaque user data which is passed back in the completion event.
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| 189 | */
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| 190 | DECLCALLBACKMEMBER(int, pfnReqPrepareSg) (RTIOQUEUEPROV hIoQueueProv, PCRTHANDLE pHandle, RTIOQUEUEOP enmOp,
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| 191 | uint64_t off, PCRTSGBUF pSgBuf, size_t cbSg, uint32_t fReqFlags,
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| 192 | void *pvUser);
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| 193 |
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| 194 | /**
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| 195 | * Commits all prepared requests to the consumer for processing.
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| 196 | *
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| 197 | * @returns IPRT status code.
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| 198 | * @param hIoQueueProv The I/O queue provider instance.
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| 199 | * @param pcReqsCommitted Where to store the number of requests actually committed.
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| 200 | */
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| 201 | DECLCALLBACKMEMBER(int, pfnCommit) (RTIOQUEUEPROV hIoQueueProv, uint32_t *pcReqsCommitted);
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| 202 |
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| 203 | /**
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| 204 | * Waits for completion events from the given I/O queue.
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| 205 | *
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| 206 | * @returns IPRT status code.
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| 207 | * @retval VERR_IOQUEUE_EMPTY if there is nothing to wait for.
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| 208 | * @param hIoQueueProv The I/O queue provider instance.
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| 209 | * @param paCEvt Pointer to the array of completion event entries to fill.
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| 210 | * @param cCEvt Size of the completion event entry array.
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| 211 | * @param cMinWait Minimum number of completion events to wait for before returning.
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| 212 | * @param pcCEvt Where to store the number of completion events on success.
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| 213 | * @param fFlags Additional flags controlling the wait behavior.
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| 214 | */
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| 215 | DECLCALLBACKMEMBER(int, pfnEvtWait) (RTIOQUEUEPROV hIoQueueProv, PRTIOQUEUECEVT paCEvt, uint32_t cCEvt,
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| 216 | uint32_t cMinWait, uint32_t *pcCEvt, uint32_t fFlags);
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| 217 |
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| 218 | /**
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| 219 | * Wakes up the thread waiting in RTIOQUEUEPROVVTABLE::pfnEvtWait().
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| 220 | *
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| 221 | * @returns IPRT status code.
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| 222 | * @param hIoQueueProv The I/O queue provider instance.
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| 223 | */
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| 224 | DECLCALLBACKMEMBER(int, pfnEvtWaitWakeup) (RTIOQUEUEPROV hIoQueueProv);
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| 225 |
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| 226 | /** Marks the end of the structure (RTIOQUEUEPROVVTABLE_VERSION). */
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| 227 | uintptr_t uEndMarker;
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| 228 | } RTIOQUEUEPROVVTABLE;
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| 229 | /** Pointer to an I/O queue provider vtable. */
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| 230 | typedef RTIOQUEUEPROVVTABLE *PRTIOQUEUEPROVVTABLE;
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| 231 | /** Pointer to a const I/O queue provider vtable. */
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| 232 | typedef RTIOQUEUEPROVVTABLE const *PCRTIOQUEUEPROVVTABLE;
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| 233 |
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| 234 | /** The RTIOQUEUEPROVVTABLE structure version. */
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| 235 | #define RTIOQUEUEPROVVTABLE_VERSION RT_MAKE_U32_FROM_U8(0xff,0xf,1,0)
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| 236 |
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| 237 | /** @name RTIOQUEUEPROVVTABLE::fFlags
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| 238 | * @{ */
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| 239 | /** Provider supports S/G lists. */
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| 240 | #define RTIOQUEUEPROVVTABLE_F_SG RT_BIT_32(0)
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| 241 | /** Mask of the valid I/O stream feature flags. */
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| 242 | #define RTIOQUEUEPROVVTABLE_F_VALID_MASK UINT32_C(0x00000001)
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| 243 | /** @} */
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| 244 |
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| 245 |
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| 246 | /**
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| 247 | * Tries to return the best I/O queue provider for the given handle type on the called
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| 248 | * host system.
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| 249 | *
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| 250 | * @returns Pointer to the I/O queue provider handle table or NULL if no suitable
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| 251 | * provider was found for the given handle type.
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| 252 | * @param enmHnd The handle type to look for a provider.
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| 253 | */
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| 254 | RTDECL(PCRTIOQUEUEPROVVTABLE) RTIoQueueProviderGetBestForHndType(RTHANDLETYPE enmHnd);
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| 255 |
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| 256 |
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| 257 | /**
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| 258 | * Returns the I/O queue provider with the given ID.
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| 259 | *
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| 260 | * @returns Pointer to the I/O queue provider handle table or NULL if no provider with
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| 261 | * the given ID was found.
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| 262 | * @param pszId The ID to look for.
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| 263 | */
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| 264 | RTDECL(PCRTIOQUEUEPROVVTABLE) RTIoQueueProviderGetById(const char *pszId);
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| 265 |
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| 266 |
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| 267 | /**
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| 268 | * Creates a new I/O queue with the given consumer.
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| 269 | *
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| 270 | * @returns IPRT status code.
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| 271 | * @param phIoQueue Where to store the handle to the I/O queue on success.
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| 272 | * @param pProvVTable The I/O queue provider vtable which will process the requests.
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| 273 | * @param fFlags Flags for the queue (MBZ for now).
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| 274 | * @param cSqEntries Number of entries for the submission queue.
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| 275 | * @param cCqEntries Number of entries for the completion queue.
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| 276 | *
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| 277 | * @note The number of submission and completion queue entries serve only as a hint to the
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| 278 | * provider implementation. It may decide to align the number to a smaller or greater
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| 279 | * size.
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| 280 | */
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| 281 | RTDECL(int) RTIoQueueCreate(PRTIOQUEUE phIoQueue, PCRTIOQUEUEPROVVTABLE pProvVTable,
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| 282 | uint32_t fFlags, uint32_t cSqEntries, uint32_t cCqEntries);
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| 283 |
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| 284 |
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| 285 | /**
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| 286 | * Destroys the given I/O queue.
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| 287 | *
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| 288 | * @returns IPRT status code.
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| 289 | * @retval VERR_IOQUEUE_BUSY if the I/O queue is still processing requests.
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| 290 | * @param hIoQueue The I/O queue handle to destroy.
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| 291 | */
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| 292 | RTDECL(int) RTIoQueueDestroy(RTIOQUEUE hIoQueue);
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| 293 |
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| 294 |
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| 295 | /**
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| 296 | * Registers the given handle for use with the I/O queue.
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| 297 | *
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| 298 | * @returns IPRT status code.
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| 299 | * @retval VERR_ALREADY_EXISTS if the handle was already registered.
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| 300 | * @retval VERR_NOT_SUPPORTED if the handle type is not supported by the consumer
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| 301 | * for the given I/O queue.
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| 302 | * @param hIoQueue The I/O queue handle.
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| 303 | * @param pHandle The handle to register.
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| 304 | */
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| 305 | RTDECL(int) RTIoQueueHandleRegister(RTIOQUEUE hIoQueue, PCRTHANDLE pHandle);
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| 306 |
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| 307 |
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| 308 | /**
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| 309 | * Deregisters the given handle from the given I/O queue.
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| 310 | *
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| 311 | * @returns IPRT status code.
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| 312 | * @retval VERR_IOQUEUE_HANDLE_NOT_REGISTERED if the handle wasn't registered by a call to RTIoQueueHandleRegister().
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| 313 | * @param hIoQueue The I/O queue handle.
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| 314 | * @param pHandle The handle to deregister.
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| 315 | */
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| 316 | RTDECL(int) RTIoQueueHandleDeregister(RTIOQUEUE hIoQueue, PCRTHANDLE pHandle);
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| 317 |
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| 318 |
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| 319 | /**
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| 320 | * Prepares a request for the given I/O queue.
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| 321 | *
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| 322 | * @returns IPRT status code.
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| 323 | * @retval VERR_IOQUEUE_FULL if the I/O queue can't accept the new request because the submission queue is full.
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| 324 | * @retval VERR_IOQUEUE_HANDLE_NOT_REGISTERED if the handle wasn't registered for use with RTIoQueueHandleRegister() yet.
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| 325 | * @param hIoQueue The I/O queue handle.
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| 326 | * @param pHandle The handle the request is for.
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| 327 | * @param enmOp The operation to perform.
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| 328 | * @param off Start offset (if applicable, not all handles support/require it and will ignore it).
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| 329 | * @param pvBuf Buffer to use for read/write operations (sync ignores this).
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| 330 | * @param cbBuf Size of the buffer in bytes.
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| 331 | * @param fReqFlags Additional flags for the request.
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| 332 | * @param pvUser Opaque user data which is passed back in the completion event.
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| 333 | */
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| 334 | RTDECL(int) RTIoQueueRequestPrepare(RTIOQUEUE hIoQueue, PCRTHANDLE pHandle, RTIOQUEUEOP enmOp,
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| 335 | uint64_t off, void *pvBuf, size_t cbBuf, uint32_t fReqFlags,
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| 336 | void *pvUser);
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| 337 |
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| 338 |
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| 339 | /**
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| 340 | * Prepares a request for the given I/O queue - S/G buffer variant.
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| 341 | *
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| 342 | * @returns IPRT status code.
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| 343 | * @retval VERR_IOQUEUE_FULL if the I/O queue can't accept the new request because the submission queue is full.
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| 344 | * @retval VERR_IOQUEUE_HANDLE_NOT_REGISTERED if the handle wasn't registered for use with RTIoQueueHandleRegister() yet.
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| 345 | * @param hIoQueue The I/O queue handle.
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| 346 | * @param pHandle The handle the request is for.
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| 347 | * @param enmOp The operation to perform.
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| 348 | * @param off Start offset (if applicable, not all handles support/require it and will ignore it).
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| 349 | * @param pSgBuf The S/G buufer to use for read/write operations (sync ignores this).
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| 350 | * @param cbSg Number of bytes to transfer from the S/G buffer.
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| 351 | * @param fReqFlags Additional flags for the request.
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| 352 | * @param pvUser Opaque user data which is passed back in the completion event.
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| 353 | */
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| 354 | RTDECL(int) RTIoQueueRequestPrepareSg(RTIOQUEUE hIoQueue, PCRTHANDLE pHandle, RTIOQUEUEOP enmOp,
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| 355 | uint64_t off, PCRTSGBUF pSgBuf, size_t cbSg, uint32_t fReqFlags,
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| 356 | void *pvUser);
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| 357 |
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| 358 |
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| 359 | /**
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| 360 | * Commits all prepared requests to the consumer for processing.
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| 361 | *
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| 362 | * @returns IPRT status code.
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| 363 | * @retval VERR_IOQUEUE_EMPTY if there is nothing to commit.
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| 364 | * @param hIoQueue The I/O queue handle.
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| 365 | */
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| 366 | RTDECL(int) RTIoQueueCommit(RTIOQUEUE hIoQueue);
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| 367 |
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| 368 |
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| 369 | /**
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| 370 | * Waits for completion events from the given I/O queue.
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| 371 | *
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| 372 | * @returns IPRT status code.
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| 373 | * @retval VERR_IOQUEUE_EMPTY if there is nothing to wait for.
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| 374 | * @param hIoQueue The I/O queue handle.
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| 375 | * @param paCEvt Pointer to the array of completion event entries to fill.
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| 376 | * @param cCEvt Size of the completion event entry array.
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| 377 | * @param cMinWait Minimum number of completion events to wait for before returning.
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| 378 | * @param pcCEvt Where to store the number of completion events on success.
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| 379 | * @param fFlags Additional flags controlling the wait behavior.
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| 380 | */
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| 381 | RTDECL(int) RTIoQueueEvtWait(RTIOQUEUE hIoQueue, PRTIOQUEUECEVT paCEvt, uint32_t cCEvt, uint32_t cMinWait,
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| 382 | uint32_t *pcCEvt, uint32_t fFlags);
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| 383 |
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| 384 |
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| 385 | /**
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| 386 | * Wakes up the thread waiting in RTIoQueueEvtWait().
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| 387 | *
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| 388 | * @returns IPRT status code.
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| 389 | * @param hIoQueue The I/O queue handle to wake up.
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| 390 | */
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| 391 | RTDECL(int) RTIoQueueEvtWaitWakeup(RTIOQUEUE hIoQueue);
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| 392 |
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| 393 | /** @} */
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| 394 |
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| 395 | RT_C_DECLS_END
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| 396 |
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| 397 | #endif /* !IPRT_INCLUDED_ioqueue_h */
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| 398 |
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