PDMAllQueue.cpp revision 83df31c21044349888e688d5f793ce39007e6693
/* $Id$ */
/** @file
* PDM Queue - Transport data and tasks to EMT and R3.
*/
/*
* Copyright (C) 2006-2007 Sun Microsystems, Inc.
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 USA or visit http://www.sun.com if you need
* additional information or have any questions.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#define LOG_GROUP LOG_GROUP_PDM_QUEUE
#include "PDMInternal.h"
#include <VBox/pdm.h>
#ifndef IN_RC
# include <VBox/rem.h>
# include <VBox/mm.h>
#endif
#include <VBox/vm.h>
#include <VBox/err.h>
#include <VBox/log.h>
#include <iprt/asm.h>
#include <iprt/assert.h>
/**
* Allocate an item from a queue.
* The allocated item must be handed on to PDMR3QueueInsert() after the
* data have been filled in.
*
* @returns Pointer to allocated queue item.
* @returns NULL on failure. The queue is exhausted.
* @param pQueue The queue handle.
* @thread Any thread.
*/
VMMDECL(PPDMQUEUEITEMCORE) PDMQueueAlloc(PPDMQUEUE pQueue)
{
Assert(VALID_PTR(pQueue) && pQueue->CTX_SUFF(pVM));
PPDMQUEUEITEMCORE pNew;
uint32_t iNext;
uint32_t i;
do
{
i = pQueue->iFreeTail;
if (i == pQueue->iFreeHead)
{
STAM_REL_COUNTER_INC(&pQueue->StatAllocFailures);
return NULL;
}
pNew = pQueue->aFreeItems[i].CTX_SUFF(pItem);
iNext = (i + 1) % (pQueue->cItems + PDMQUEUE_FREE_SLACK);
} while (!ASMAtomicCmpXchgU32(&pQueue->iFreeTail, iNext, i));
return pNew;
}
/**
* Queue an item.
* The item must have been obtained using PDMQueueAlloc(). Once the item
* have been passed to this function it must not be touched!
*
* @param pQueue The queue handle.
* @param pItem The item to insert.
* @thread Any thread.
*/
VMMDECL(void) PDMQueueInsert(PPDMQUEUE pQueue, PPDMQUEUEITEMCORE pItem)
{
Assert(VALID_PTR(pQueue) && pQueue->CTX_SUFF(pVM));
Assert(VALID_PTR(pItem));
PPDMQUEUEITEMCORE pNext;
do
{
pNext = pQueue->CTX_SUFF(pPending);
pItem->CTX_SUFF(pNext) = pNext;
} while (!ASMAtomicCmpXchgPtr((void * volatile *)&pQueue->CTX_SUFF(pPending), pItem, pNext));
if (!pQueue->pTimer)
{
PVM pVM = pQueue->CTX_SUFF(pVM);
Log2(("PDMQueueInsert: VM_FF_PDM_QUEUES %d -> 1\n", VM_FF_ISSET(pVM, VM_FF_PDM_QUEUES)));
VM_FF_SET(pVM, VM_FF_PDM_QUEUES);
ASMAtomicBitSet(&pVM->pdm.s.fQueueFlushing, PDM_QUEUE_FLUSH_FLAG_PENDING_BIT);
#ifdef IN_RING3
REMR3NotifyQueuePending(pVM); /** @todo r=bird: we can remove REMR3NotifyQueuePending and let VMR3NotifyFF do the work. */
VMR3NotifyGlobalFFU(pVM->pUVM, VMNOTIFYFF_FLAGS_DONE_REM);
#endif
}
STAM_REL_COUNTER_INC(&pQueue->StatInsert);
}
/**
* Queue an item.
* The item must have been obtained using PDMQueueAlloc(). Once the item
* have been passed to this function it must not be touched!
*
* @param pQueue The queue handle.
* @param pItem The item to insert.
* @param NanoMaxDelay The maximum delay before processing the queue, in nanoseconds.
* This applies only to GC.
* @thread Any thread.
*/
VMMDECL(void) PDMQueueInsertEx(PPDMQUEUE pQueue, PPDMQUEUEITEMCORE pItem, uint64_t NanoMaxDelay)
{
PDMQueueInsert(pQueue, pItem);
#ifdef IN_RC
PVM pVM = pQueue->CTX_SUFF(pVM);
/** @todo figure out where to put this, the next bit should go there too.
if (NanoMaxDelay)
{
}
else */
{
VMCPU_FF_SET(VMMGetCpu0(pVM), VMCPU_FF_TO_R3);
Log2(("PDMQueueInsertEx: Setting VMCPU_FF_TO_R3\n"));
}
#endif
}
/**
* Gets the RC pointer for the specified queue.
*
* @returns The RC address of the queue.
* @returns NULL if pQueue is invalid.
* @param pQueue The queue handle.
*/
VMMDECL(RCPTRTYPE(PPDMQUEUE)) PDMQueueRCPtr(PPDMQUEUE pQueue)
{
Assert(VALID_PTR(pQueue));
Assert(pQueue->pVMR3 && pQueue->pVMRC);
#ifdef IN_RC
return pQueue;
#else
return MMHyperCCToRC(pQueue->CTX_SUFF(pVM), pQueue);
#endif
}
/**
* Gets the ring-0 pointer for the specified queue.
*
* @returns The ring-0 address of the queue.
* @returns NULL if pQueue is invalid.
* @param pQueue The queue handle.
*/
VMMDECL(R0PTRTYPE(PPDMQUEUE)) PDMQueueR0Ptr(PPDMQUEUE pQueue)
{
Assert(VALID_PTR(pQueue));
Assert(pQueue->pVMR3 && pQueue->pVMR0);
#ifdef IN_RING0
return pQueue;
#else
return MMHyperCCToR0(pQueue->CTX_SUFF(pVM), pQueue);
#endif
}
/**
* Flushes a PDM queue.
*
* @param pQueue The queue handle.
*/
VMMDECL(void) PDMQueueFlush(PPDMQUEUE pQueue)
{
Assert(VALID_PTR(pQueue));
Assert(pQueue->pVMR3);
PVM pVM = pQueue->CTX_SUFF(pVM);
#if defined(IN_RC) || defined(IN_RING0)
Assert(pQueue->CTX_SUFF(pVM));
pVM->pdm.s.CTX_SUFF(pQueueFlush) = pQueue;
VMMRZCallRing3NoCpu(pVM, VMMCALLRING3_PDM_QUEUE_FLUSH, (uintptr_t)pQueue);
#else /* IN_RING3: */
PVMREQ pReq;
VMR3ReqCall(pVM, VMCPUID_ANY, &pReq, RT_INDEFINITE_WAIT, (PFNRT)PDMR3QueueFlushWorker, 2, pVM, pQueue);
VMR3ReqFree(pReq);
#endif
}