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/** @file
* PDM - Pluggable Device Manager, Queues.
*/
/*
* Copyright (C) 2006-2025 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 VBOX_INCLUDED_vmm_pdmqueue_h
#define VBOX_INCLUDED_vmm_pdmqueue_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <VBox/types.h>
RT_C_DECLS_BEGIN
/** @defgroup grp_pdm_queue The PDM Queues API
* @ingroup grp_pdm
* @{
*/
/** Pointer to a PDM queue. */
typedef struct PDMQUEUE *PPDMQUEUE;
/** Pointer to a PDM queue item core. */
typedef union PDMQUEUEITEMCORE *PPDMQUEUEITEMCORE;
/**
* PDM queue item core.
*/
typedef union PDMQUEUEITEMCORE
{
/** The next queue item on the pending list (UINT32_MAX for NIL). */
uint32_t volatile iNext;
/** The next item about to be flushed. */
R3PTRTYPE(PPDMQUEUEITEMCORE) pNext;
/** Make sure the core is 64-bit wide. */
uint64_t u64View;
} PDMQUEUEITEMCORE;
/**
* Queue consumer callback for devices.
*
* @returns Success indicator.
* If false the item will not be removed and the flushing will stop.
* @param pDevIns The device instance.
* @param pItem The item to consume. Upon return this item will be freed.
* @remarks The device critical section will NOT be entered before calling the
* callback. No locks will be held, but for now it's safe to assume
* that only one EMT will do queue callbacks at any one time.
*/
typedef DECLCALLBACKTYPE(bool, FNPDMQUEUEDEV,(PPDMDEVINS pDevIns, PPDMQUEUEITEMCORE pItem));
/** Pointer to a FNPDMQUEUEDEV(). */
typedef FNPDMQUEUEDEV *PFNPDMQUEUEDEV;
/**
* Queue consumer callback for USB devices.
*
* @returns Success indicator.
* If false the item will not be removed and the flushing will stop.
* @param pUsbIns The USB device instance.
* @param pItem The item to consume. Upon return this item will be freed.
* @remarks No locks will be held, but for now it's safe to assume that only one
* EMT will do queue callbacks at any one time.
*/
typedef DECLCALLBACKTYPE(bool, FNPDMQUEUEUSB,(PPDMUSBINS pUsbIns, PPDMQUEUEITEMCORE pItem));
/** Pointer to a FNPDMQUEUEUSB(). */
typedef FNPDMQUEUEUSB *PFNPDMQUEUEUSB;
/**
* Queue consumer callback for drivers.
*
* @returns Success indicator.
* If false the item will not be removed and the flushing will stop.
* @param pDrvIns The driver instance.
* @param pItem The item to consume. Upon return this item will be freed.
* @remarks No locks will be held, but for now it's safe to assume that only one
* EMT will do queue callbacks at any one time.
*/
typedef DECLCALLBACKTYPE(bool, FNPDMQUEUEDRV,(PPDMDRVINS pDrvIns, PPDMQUEUEITEMCORE pItem));
/** Pointer to a FNPDMQUEUEDRV(). */
typedef FNPDMQUEUEDRV *PFNPDMQUEUEDRV;
/**
* Queue consumer callback for internal component.
*
* @returns Success indicator.
* If false the item will not be removed and the flushing will stop.
* @param pVM The cross context VM structure.
* @param pItem The item to consume. Upon return this item will be freed.
* @remarks No locks will be held, but for now it's safe to assume that only one
* EMT will do queue callbacks at any one time.
*/
typedef DECLCALLBACKTYPE(bool, FNPDMQUEUEINT,(PVM pVM, PPDMQUEUEITEMCORE pItem));
/** Pointer to a FNPDMQUEUEINT(). */
typedef FNPDMQUEUEINT *PFNPDMQUEUEINT;
/**
* Queue consumer callback for external component.
*
* @returns Success indicator.
* If false the item will not be removed and the flushing will stop.
* @param pvUser User argument.
* @param pItem The item to consume. Upon return this item will be freed.
* @remarks No locks will be held, but for now it's safe to assume that only one
* EMT will do queue callbacks at any one time.
*/
typedef DECLCALLBACKTYPE(bool, FNPDMQUEUEEXT,(void *pvUser, PPDMQUEUEITEMCORE pItem));
/** Pointer to a FNPDMQUEUEEXT(). */
typedef FNPDMQUEUEEXT *PFNPDMQUEUEEXT;
#ifdef VBOX_IN_VMM
VMMR3_INT_DECL(int) PDMR3QueueCreateDevice(PVM pVM, PPDMDEVINS pDevIns, size_t cbItem, uint32_t cItems,
uint32_t cMilliesInterval, PFNPDMQUEUEDEV pfnCallback,
bool fRZEnabled, const char *pszName, PDMQUEUEHANDLE *phQueue);
VMMR3_INT_DECL(int) PDMR3QueueCreateDriver(PVM pVM, PPDMDRVINS pDrvIns, size_t cbItem, uint32_t cItems,
uint32_t cMilliesInterval, PFNPDMQUEUEDRV pfnCallback,
const char *pszName, PDMQUEUEHANDLE *phQueue);
VMMR3_INT_DECL(int) PDMR3QueueCreateInternal(PVM pVM, size_t cbItem, uint32_t cItems,
uint32_t cMilliesInterval, PFNPDMQUEUEINT pfnCallback,
bool fRZEnabled, const char *pszName, PDMQUEUEHANDLE *phQueue);
VMMR3DECL(int) PDMR3QueueCreateExternal(PVM pVM, size_t cbItem, uint32_t cItems, uint32_t cMilliesInterval,
PFNPDMQUEUEEXT pfnCallback, void *pvUser, const char *pszName, PDMQUEUEHANDLE *phQueue);
VMMR3DECL(int) PDMR3QueueDestroy(PVM pVM, PDMQUEUEHANDLE hQueue, void *pvOwner);
VMMR3_INT_DECL(int) PDMR3QueueDestroyDevice(PVM pVM, PPDMDEVINS pDevIns);
VMMR3_INT_DECL(int) PDMR3QueueDestroyDriver(PVM pVM, PPDMDRVINS pDrvIns);
VMMR3DECL(void) PDMR3QueueFlushAll(PVM pVM);
#endif /* VBOX_IN_VMM */
VMMDECL(PPDMQUEUEITEMCORE) PDMQueueAlloc(PVMCC pVM, PDMQUEUEHANDLE hQueue, void *pvOwner);
VMMDECL(int) PDMQueueInsert(PVMCC pVM, PDMQUEUEHANDLE hQueue, void *pvOwner, PPDMQUEUEITEMCORE pInsert);
VMMDECL(int) PDMQueueFlushIfNecessary(PVMCC pVM, PDMQUEUEHANDLE hQueue, void *pvOwner);
/** @} */
RT_C_DECLS_END
#endif /* !VBOX_INCLUDED_vmm_pdmqueue_h */
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