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Diffstat (limited to 'include/iprt/ioqueue.h')
| -rw-r--r-- | include/iprt/ioqueue.h | 405 |
1 files changed, 405 insertions, 0 deletions
diff --git a/include/iprt/ioqueue.h b/include/iprt/ioqueue.h new file mode 100644 index 00000000..92f1e2f1 --- /dev/null +++ b/include/iprt/ioqueue.h @@ -0,0 +1,405 @@ +/** @file + * IPRT Generic I/O queue API. + */ + +/* + * Copyright (C) 2019-2022 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox 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. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + +#ifndef IPRT_INCLUDED_ioqueue_h +#define IPRT_INCLUDED_ioqueue_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <iprt/types.h> +#include <iprt/sg.h> + +RT_C_DECLS_BEGIN + +/** @defgroup grp_rt_ioqueue IPRT generic I/O queue API + * @ingroup grp_rt + * + * This API models a generic I/O queue which can be attached to different providers + * for different types of handles. + * + * @{ + */ + + +/** + * I/O queue request operations. + */ +typedef enum RTIOQUEUEOP +{ + /** The usual invalid option. */ + RTIOQUEUEOP_INVALID = 0, + /** Read request. */ + RTIOQUEUEOP_READ, + /** Write request. */ + RTIOQUEUEOP_WRITE, + /** Synchronize (i.e. flush) request. */ + RTIOQUEUEOP_SYNC, + /** Usual 32bit hack. */ + RTIOQUEUEOP_32BIT_HACK = 0x7fffffff +} RTIOQUEUEOP; +/** Pointer to a I/O queue operation code. */ +typedef RTIOQUEUEOP *PRTIOQUEUEOP; + +/** I/O queue provider (processes requests put into the I/O queue) handle. */ +typedef struct RTIOQUEUEPROVINT *RTIOQUEUEPROV; +/** I/O queue handle. */ +typedef struct RTIOQUEUEINT *RTIOQUEUE; +/** Pointer to an I/O queue handle. */ +typedef RTIOQUEUE *PRTIOQUEUE; +/** NIL I/O queue handle value. */ +#define NIL_RTIOQUEUE ((RTIOQUEUE)0) + + +/** + * I/O queue completion event. + */ +typedef struct RTIOQUEUECEVT +{ + /** The user data passed when preparing the request. */ + void *pvUser; + /** The IPRT status code for this request. */ + int rcReq; + /** Transferred data size if applicaple by the request. */ + size_t cbXfered; +} RTIOQUEUECEVT; +/** Pointer to a I/O queue completion event. */ +typedef RTIOQUEUECEVT *PRTIOQUEUECEVT; +/** Pointer to a const I/O queue completion event. */ +typedef const RTIOQUEUECEVT *PCRTIOQUEUECEVT; + + +/** + * I/O queue provider virtual method table. + */ +typedef struct RTIOQUEUEPROVVTABLE +{ + /** The structure version (RTIOQUEUEPROVVTABLE_VERSION). */ + uint32_t uVersion; + /** Provider ID. */ + const char *pszId; + /** Size of provider specific data for an I/O queue instance. */ + size_t cbIoQueueProv; + /** The handle type the provider is able to process. */ + RTHANDLETYPE enmHnd; + /** Additional flags for exposing supported features or quirks to the user. */ + uint32_t fFlags; + + /** + * Returns whether the provider is supported on the calling host system. + * + * @returns Flag whether the provider is supported. + */ + DECLCALLBACKMEMBER(bool, pfnIsSupported,(void)); + + /** + * Initializes the provider specific parts of the given I/O queue. + * + * @returns IPRT status code. + * @param hIoQueueProv The I/O queue provider instance to initialize. + * @param fFlags Flags for the queue. + * @param cSqEntries Number of entries for the submission queue. + * @param cCqEntries Number of entries for the completion queue. + */ + DECLCALLBACKMEMBER(int, pfnQueueInit,(RTIOQUEUEPROV hIoQueueProv, uint32_t fFlags, uint32_t cSqEntries, uint32_t cCqEntries)); + + /** + * Destroys the provider specific parts of the I/O queue and frees all + * associated resources. + * + * @returns nothing. + * @param hIoQueueProv The I/O queue provider instance to destroy. + */ + DECLCALLBACKMEMBER(void, pfnQueueDestroy,(RTIOQUEUEPROV hIoQueueProv)); + + /** + * Registers the given handle for use with the I/O queue instance. + * The generic code already checked for the correct handle type and that the + * handle wasn't registered already by tracking all registered handles. + * + * @returns IPRT status code. + * @param hIoQueueProv The I/O queue provider instance. + * @param pHandle The handle to register. + */ + DECLCALLBACKMEMBER(int, pfnHandleRegister,(RTIOQUEUEPROV hIoQueueProv, PCRTHANDLE pHandle)); + + /** + * Deregisters the given handle for use with the I/O queue instance. + * The generic code already checked for the correct handle type and that the + * handle was registered previously. + * + * @returns IPRT status code. + * @param hIoQueueProv The I/O queue provider instance. + * @param pHandle The handle to deregister. + */ + DECLCALLBACKMEMBER(int, pfnHandleDeregister,(RTIOQUEUEPROV hIoQueueProv, PCRTHANDLE pHandle)); + + /** + * Prepares a request for the given I/O queue. + * + * @returns IPRT status code. + * @param hIoQueueProv The I/O queue provider instance. + * @param pHandle The handle the request is for. + * @param enmOp The operation to perform. + * @param off Start offset (if applicable, not all handles support/require it and will ignore it). + * @param pvBuf Buffer to use for read/write operations (sync ignores this). + * @param cbBuf Size of the buffer in bytes. + * @param fReqFlags Additional flags for the request. + * @param pvUser Opaque user data which is passed back in the completion event. + */ + DECLCALLBACKMEMBER(int, pfnReqPrepare,(RTIOQUEUEPROV hIoQueueProv, PCRTHANDLE pHandle, RTIOQUEUEOP enmOp, + uint64_t off, void *pvBuf, size_t cbBuf, uint32_t fReqFlags, void *pvUser)); + + /** + * Prepares a request for the given I/O queue. + * + * @returns IPRT status code. + * @param hIoQueueProv The I/O queue provider instance. + * @param pHandle The handle the request is for. + * @param enmOp The operation to perform. + * @param off Start offset (if applicable, not all handles support/require it and will ignore it). + * @param pSgBuf The S/G buufer to use for read/write operations (sync ignores this). + * @param cbSg Number of bytes to transfer from the S/G buffer. + * @param fReqFlags Additional flags for the request. + * @param pvUser Opaque user data which is passed back in the completion event. + */ + DECLCALLBACKMEMBER(int, pfnReqPrepareSg,(RTIOQUEUEPROV hIoQueueProv, PCRTHANDLE pHandle, RTIOQUEUEOP enmOp, + uint64_t off, PCRTSGBUF pSgBuf, size_t cbSg, uint32_t fReqFlags, void *pvUser)); + + /** + * Commits all prepared requests to the consumer for processing. + * + * @returns IPRT status code. + * @param hIoQueueProv The I/O queue provider instance. + * @param pcReqsCommitted Where to store the number of requests actually committed. + */ + DECLCALLBACKMEMBER(int, pfnCommit,(RTIOQUEUEPROV hIoQueueProv, uint32_t *pcReqsCommitted)); + + /** + * Waits for completion events from the given I/O queue. + * + * @returns IPRT status code. + * @retval VERR_IOQUEUE_EMPTY if there is nothing to wait for. + * @param hIoQueueProv The I/O queue provider instance. + * @param paCEvt Pointer to the array of completion event entries to fill. + * @param cCEvt Size of the completion event entry array. + * @param cMinWait Minimum number of completion events to wait for before returning. + * @param pcCEvt Where to store the number of completion events on success. + * @param fFlags Additional flags controlling the wait behavior. + */ + DECLCALLBACKMEMBER(int, pfnEvtWait,(RTIOQUEUEPROV hIoQueueProv, PRTIOQUEUECEVT paCEvt, uint32_t cCEvt, + uint32_t cMinWait, uint32_t *pcCEvt, uint32_t fFlags)); + + /** + * Wakes up the thread waiting in RTIOQUEUEPROVVTABLE::pfnEvtWait(). + * + * @returns IPRT status code. + * @param hIoQueueProv The I/O queue provider instance. + */ + DECLCALLBACKMEMBER(int, pfnEvtWaitWakeup,(RTIOQUEUEPROV hIoQueueProv)); + + /** Marks the end of the structure (RTIOQUEUEPROVVTABLE_VERSION). */ + uintptr_t uEndMarker; +} RTIOQUEUEPROVVTABLE; +/** Pointer to an I/O queue provider vtable. */ +typedef RTIOQUEUEPROVVTABLE *PRTIOQUEUEPROVVTABLE; +/** Pointer to a const I/O queue provider vtable. */ +typedef RTIOQUEUEPROVVTABLE const *PCRTIOQUEUEPROVVTABLE; + +/** The RTIOQUEUEPROVVTABLE structure version. */ +#define RTIOQUEUEPROVVTABLE_VERSION RT_MAKE_U32_FROM_U8(0xff,0xf,1,0) + +/** @name RTIOQUEUEPROVVTABLE::fFlags + * @{ */ +/** Provider supports S/G lists. */ +#define RTIOQUEUEPROVVTABLE_F_SG RT_BIT_32(0) +/** Mask of the valid I/O stream feature flags. */ +#define RTIOQUEUEPROVVTABLE_F_VALID_MASK UINT32_C(0x00000001) +/** @} */ + + +/** + * Tries to return the best I/O queue provider for the given handle type on the called + * host system. + * + * @returns Pointer to the I/O queue provider handle table or NULL if no suitable + * provider was found for the given handle type. + * @param enmHnd The handle type to look for a provider. + */ +RTDECL(PCRTIOQUEUEPROVVTABLE) RTIoQueueProviderGetBestForHndType(RTHANDLETYPE enmHnd); + + +/** + * Returns the I/O queue provider with the given ID. + * + * @returns Pointer to the I/O queue provider handle table or NULL if no provider with + * the given ID was found. + * @param pszId The ID to look for. + */ +RTDECL(PCRTIOQUEUEPROVVTABLE) RTIoQueueProviderGetById(const char *pszId); + + +/** + * Creates a new I/O queue with the given consumer. + * + * @returns IPRT status code. + * @param phIoQueue Where to store the handle to the I/O queue on success. + * @param pProvVTable The I/O queue provider vtable which will process the requests. + * @param fFlags Flags for the queue (MBZ for now). + * @param cSqEntries Number of entries for the submission queue. + * @param cCqEntries Number of entries for the completion queue. + * + * @note The number of submission and completion queue entries serve only as a hint to the + * provider implementation. It may decide to align the number to a smaller or greater + * size. + */ +RTDECL(int) RTIoQueueCreate(PRTIOQUEUE phIoQueue, PCRTIOQUEUEPROVVTABLE pProvVTable, + uint32_t fFlags, uint32_t cSqEntries, uint32_t cCqEntries); + + +/** + * Destroys the given I/O queue. + * + * @returns IPRT status code. + * @retval VERR_IOQUEUE_BUSY if the I/O queue is still processing requests. + * @param hIoQueue The I/O queue handle to destroy. + */ +RTDECL(int) RTIoQueueDestroy(RTIOQUEUE hIoQueue); + + +/** + * Registers the given handle for use with the I/O queue. + * + * @returns IPRT status code. + * @retval VERR_ALREADY_EXISTS if the handle was already registered. + * @retval VERR_NOT_SUPPORTED if the handle type is not supported by the consumer + * for the given I/O queue. + * @param hIoQueue The I/O queue handle. + * @param pHandle The handle to register. + */ +RTDECL(int) RTIoQueueHandleRegister(RTIOQUEUE hIoQueue, PCRTHANDLE pHandle); + + +/** + * Deregisters the given handle from the given I/O queue. + * + * @returns IPRT status code. + * @retval VERR_IOQUEUE_HANDLE_NOT_REGISTERED if the handle wasn't registered by a call to RTIoQueueHandleRegister(). + * @param hIoQueue The I/O queue handle. + * @param pHandle The handle to deregister. + */ +RTDECL(int) RTIoQueueHandleDeregister(RTIOQUEUE hIoQueue, PCRTHANDLE pHandle); + + +/** + * Prepares a request for the given I/O queue. + * + * @returns IPRT status code. + * @retval VERR_IOQUEUE_FULL if the I/O queue can't accept the new request because the submission queue is full. + * @retval VERR_IOQUEUE_HANDLE_NOT_REGISTERED if the handle wasn't registered for use with RTIoQueueHandleRegister() yet. + * @param hIoQueue The I/O queue handle. + * @param pHandle The handle the request is for. + * @param enmOp The operation to perform. + * @param off Start offset (if applicable, not all handles support/require it and will ignore it). + * @param pvBuf Buffer to use for read/write operations (sync ignores this). + * @param cbBuf Size of the buffer in bytes. + * @param fReqFlags Additional flags for the request. + * @param pvUser Opaque user data which is passed back in the completion event. + */ +RTDECL(int) RTIoQueueRequestPrepare(RTIOQUEUE hIoQueue, PCRTHANDLE pHandle, RTIOQUEUEOP enmOp, + uint64_t off, void *pvBuf, size_t cbBuf, uint32_t fReqFlags, + void *pvUser); + + +/** + * Prepares a request for the given I/O queue - S/G buffer variant. + * + * @returns IPRT status code. + * @retval VERR_IOQUEUE_FULL if the I/O queue can't accept the new request because the submission queue is full. + * @retval VERR_IOQUEUE_HANDLE_NOT_REGISTERED if the handle wasn't registered for use with RTIoQueueHandleRegister() yet. + * @param hIoQueue The I/O queue handle. + * @param pHandle The handle the request is for. + * @param enmOp The operation to perform. + * @param off Start offset (if applicable, not all handles support/require it and will ignore it). + * @param pSgBuf The S/G buufer to use for read/write operations (sync ignores this). + * @param cbSg Number of bytes to transfer from the S/G buffer. + * @param fReqFlags Additional flags for the request. + * @param pvUser Opaque user data which is passed back in the completion event. + */ +RTDECL(int) RTIoQueueRequestPrepareSg(RTIOQUEUE hIoQueue, PCRTHANDLE pHandle, RTIOQUEUEOP enmOp, + uint64_t off, PCRTSGBUF pSgBuf, size_t cbSg, uint32_t fReqFlags, + void *pvUser); + + +/** + * Commits all prepared requests to the consumer for processing. + * + * @returns IPRT status code. + * @retval VERR_IOQUEUE_EMPTY if there is nothing to commit. + * @param hIoQueue The I/O queue handle. + */ +RTDECL(int) RTIoQueueCommit(RTIOQUEUE hIoQueue); + + +/** + * Waits for completion events from the given I/O queue. + * + * @returns IPRT status code. + * @retval VERR_IOQUEUE_EMPTY if there is nothing to wait for. + * @param hIoQueue The I/O queue handle. + * @param paCEvt Pointer to the array of completion event entries to fill. + * @param cCEvt Size of the completion event entry array. + * @param cMinWait Minimum number of completion events to wait for before returning. + * @param pcCEvt Where to store the number of completion events on success. + * @param fFlags Additional flags controlling the wait behavior. + */ +RTDECL(int) RTIoQueueEvtWait(RTIOQUEUE hIoQueue, PRTIOQUEUECEVT paCEvt, uint32_t cCEvt, uint32_t cMinWait, + uint32_t *pcCEvt, uint32_t fFlags); + + +/** + * Wakes up the thread waiting in RTIoQueueEvtWait(). + * + * @returns IPRT status code. + * @param hIoQueue The I/O queue handle to wake up. + */ +RTDECL(int) RTIoQueueEvtWaitWakeup(RTIOQUEUE hIoQueue); + +/** @} */ + +RT_C_DECLS_END + +#endif /* !IPRT_INCLUDED_ioqueue_h */ + |