VBoxPci.c revision 6370012ceb61956d3261edcd6781021cc975e364
/* $Id $ */
/** @file
* VBoxPci - PCI card passthrough support (Host), Common Code.
*/
/*
* Copyright (C) 2011 Oracle Corporation
*
* 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.
*/
/** @page pg_rawpci VBoxPci - host PCI support
*
* This is a kernel module that works as host proxy between guest and
* PCI hardware.
*
*/
#define LOG_GROUP LOG_GROUP_DEV_PCI_RAW
#include <VBox/log.h>
#include <VBox/err.h>
#include <VBox/sup.h>
#include <VBox/version.h>
#include <iprt/string.h>
#include <iprt/assert.h>
#include <iprt/spinlock.h>
#include <iprt/uuid.h>
#include <iprt/asm.h>
#include <iprt/mem.h>
#include "VBoxPciInternal.h"
/**
* Implements the SUPDRV component factor interface query method.
*
* @returns Pointer to an interface. NULL if not supported.
*
* @param pSupDrvFactory Pointer to the component factory registration structure.
* @param pSession The session - unused.
* @param pszInterfaceUuid The factory interface id.
*/
static DECLCALLBACK(void *) vboxPciQueryFactoryInterface(PCSUPDRVFACTORY pSupDrvFactory, PSUPDRVSESSION pSession, const char *pszInterfaceUuid)
{
PVBOXRAWPCIGLOBALS pGlobals = (PVBOXRAWPCIGLOBALS)((uint8_t *)pSupDrvFactory - RT_OFFSETOF(VBOXRAWPCIGLOBALS, SupDrvFactory));
/*
* Convert the UUID strings and compare them.
*/
RTUUID UuidReq;
int rc = RTUuidFromStr(&UuidReq, pszInterfaceUuid);
if (RT_SUCCESS(rc))
{
if (!RTUuidCompareStr(&UuidReq, RAWPCIFACTORY_UUID_STR))
{
ASMAtomicIncS32(&pGlobals->cFactoryRefs);
return &pGlobals->RawPciFactory;
}
}
else
Log(("VBoxRawPci: rc=%Rrc, uuid=%s\n", rc, pszInterfaceUuid));
return NULL;
}
/**
* @copydoc RAWPCIDEVPORT:: pfnRetain
*/
DECLHIDDEN(void) vboxPciDevRetain(PRAWPCIDEVPORT pThis)
{
}
/**
* @copydoc RAWPCIDEVPORT:: pfnRelease
*/
DECLHIDDEN(void) vboxPciDevRelease(PRAWPCIDEVPORT pThis)
{
}
/**
* @copydoc RAWPCIDEVPORT:: pfnRelease
*/
DECLHIDDEN(int) vboxPciDevInit(PRAWPCIDEVPORT pThis, uint32_t fFlags)
{
return VINF_SUCCESS;
}
/**
* Creates a new instance.
*
* @returns VBox status code.
* @param pGlobals The globals.
* @param pszName The instance name.
* @param ppDevPort Where to store the pointer to our port interface.
*/
static int vboxPciNewInstance(PVBOXRAWPCIGLOBALS pGlobals,
uint32_t u32HostAddress,
uint32_t fFlags,
PRAWPCIDEVPORT *ppDevPort)
{
int rc;
PVBOXRAWPCIINS pNew = (PVBOXRAWPCIINS)RTMemAllocZ(sizeof(*pNew));
if (!pNew)
return VERR_NO_MEMORY;
pNew->pGlobals = pGlobals;
pNew->hSpinlock = NIL_RTSPINLOCK;
pNew->cRefs = 1;
pNew->pNext = NULL;
pNew->HostPciAddress = u32HostAddress;
pNew->DevPort.u32Version = RAWPCIDEVPORT_VERSION;
pNew->DevPort.pfnRetain = vboxPciDevRetain;
pNew->DevPort.pfnRelease = vboxPciDevRelease;
pNew->DevPort.pfnInit = vboxPciDevInit;
pNew->DevPort.u32VersionEnd = RAWPCIDEVPORT_VERSION;
rc = RTSpinlockCreate(&pNew->hSpinlock);
if (RT_SUCCESS(rc))
{
rc = pNew->DevPort.pfnInit(&pNew->DevPort, fFlags);
if (RT_SUCCESS(rc))
{
*ppDevPort = &pNew->DevPort;
}
else
{
RTSpinlockDestroy(pNew->hSpinlock);
RTMemFree(pNew);
}
return rc;
}
return rc;
}
/**
* @copydoc RAWPCIFACTORY::pfnCreateAndConnect
*/
static DECLCALLBACK(int) vboxPciFactoryCreateAndConnect(PRAWPCIFACTORY pFactory,
uint32_t u32HostAddress,
uint32_t fFlags,
PRAWPCIDEVPORT *ppDevPort)
{
PVBOXRAWPCIGLOBALS pGlobals = (PVBOXRAWPCIGLOBALS)((uint8_t *)pFactory - RT_OFFSETOF(VBOXRAWPCIGLOBALS, RawPciFactory));
int rc;
LogFlow(("vboxPciFactoryCreateAndConnect: PCI=%x fFlags=%#x\n", u32HostAddress, fFlags));
Assert(pGlobals->cFactoryRefs > 0);
rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
AssertRCReturn(rc, rc);
rc = vboxPciNewInstance(pGlobals, u32HostAddress, fFlags, ppDevPort);
RTSemFastMutexRelease(pGlobals->hFastMtx);
return rc;
}
/**
* @copydoc RAWPCIFACTORY::pfnRelease
*/
static DECLCALLBACK(void) vboxPciFactoryRelease(PRAWPCIFACTORY pFactory)
{
PVBOXRAWPCIGLOBALS pGlobals = (PVBOXRAWPCIGLOBALS)((uint8_t *)pFactory - RT_OFFSETOF(VBOXRAWPCIGLOBALS, RawPciFactory));
int32_t cRefs = ASMAtomicDecS32(&pGlobals->cFactoryRefs);
Assert(cRefs >= 0); NOREF(cRefs);
LogFlow(("vboxPciFactoryRelease: cRefs=%d (new)\n", cRefs));
}
static DECLHIDDEN(bool) vboxPciCanUnload(PVBOXRAWPCIGLOBALS pGlobals)
{
int rc = RTSemFastMutexRequest(pGlobals->hFastMtx);
bool fRc = !pGlobals->pInstanceHead
&& pGlobals->cFactoryRefs <= 0;
RTSemFastMutexRelease(pGlobals->hFastMtx);
AssertRC(rc);
return fRc;
}
static DECLHIDDEN(int) vboxPciInitIdc(PVBOXRAWPCIGLOBALS pGlobals)
{
int rc;
Assert(!pGlobals->fIDCOpen);
/*
* Establish a connection to SUPDRV and register our component factory.
*/
rc = SUPR0IdcOpen(&pGlobals->SupDrvIDC, 0 /* iReqVersion = default */, 0 /* iMinVersion = default */, NULL, NULL, NULL);
if (RT_SUCCESS(rc))
{
rc = SUPR0IdcComponentRegisterFactory(&pGlobals->SupDrvIDC, &pGlobals->SupDrvFactory);
if (RT_SUCCESS(rc))
{
pGlobals->fIDCOpen = true;
Log(("VBoxRawPci: pSession=%p\n", SUPR0IdcGetSession(&pGlobals->SupDrvIDC)));
return rc;
}
/* bail out. */
LogRel(("VBoxRawPci: Failed to register component factory, rc=%Rrc\n", rc));
SUPR0IdcClose(&pGlobals->SupDrvIDC);
}
return rc;
}
/**
* Try to close the IDC connection to SUPDRV if established.
*
* @returns VBox status code.
* @retval VINF_SUCCESS on success.
* @retval VERR_WRONG_ORDER if we're busy.
*
* @param pGlobals Pointer to the globals.
*/
DECLHIDDEN(int) vboxPciDeleteIdc(PVBOXRAWPCIGLOBALS pGlobals)
{
int rc;
Assert(pGlobals->hFastMtx != NIL_RTSEMFASTMUTEX);
/*
* Check before trying to deregister the factory.
*/
if (!vboxPciCanUnload(pGlobals))
return VERR_WRONG_ORDER;
if (!pGlobals->fIDCOpen)
rc = VINF_SUCCESS;
else
{
/*
* Disconnect from SUPDRV.
*/
rc = SUPR0IdcComponentDeregisterFactory(&pGlobals->SupDrvIDC, &pGlobals->SupDrvFactory);
AssertRC(rc);
SUPR0IdcClose(&pGlobals->SupDrvIDC);
pGlobals->fIDCOpen = false;
}
return rc;
}
/**
* Initializes the globals.
*
* @returns VBox status code.
* @param pGlobals Pointer to the globals.
*/
DECLHIDDEN(int) vboxPciInitGlobals(PVBOXRAWPCIGLOBALS pGlobals)
{
/*
* Initialize the common portions of the structure.
*/
int rc = RTSemFastMutexCreate(&pGlobals->hFastMtx);
if (RT_SUCCESS(rc))
{
pGlobals->pInstanceHead = NULL;
pGlobals->RawPciFactory.pfnRelease = vboxPciFactoryRelease;
pGlobals->RawPciFactory.pfnCreateAndConnect = vboxPciFactoryCreateAndConnect;
memcpy(pGlobals->SupDrvFactory.szName, "VBoxRawPci", sizeof("VBoxRawPci"));
pGlobals->SupDrvFactory.pfnQueryFactoryInterface = vboxPciQueryFactoryInterface;
pGlobals->fIDCOpen = false;
}
return rc;
}
/**
* Deletes the globals.
*
*
* @param pGlobals Pointer to the globals.
*/
DECLHIDDEN(void) vboxPciDeleteGlobals(PVBOXRAWPCIGLOBALS pGlobals)
{
Assert(!pGlobals->fIDCOpen);
/*
* Release resources.
*/
if (pGlobals->hFastMtx)
{
RTSemFastMutexDestroy(pGlobals->hFastMtx);
pGlobals->hFastMtx = NIL_RTSEMFASTMUTEX;
}
}
int vboxPciInit(PVBOXRAWPCIGLOBALS pGlobals)
{
/*
* Initialize the common portions of the structure.
*/
int rc = vboxPciInitGlobals(pGlobals);
if (RT_SUCCESS(rc))
{
rc = vboxPciInitIdc(pGlobals);
if (RT_SUCCESS(rc))
return rc;
/* bail out. */
vboxPciDeleteGlobals(pGlobals);
}
return rc;
}
void vboxPciShutdown(PVBOXRAWPCIGLOBALS pGlobals)
{
int rc = vboxPciDeleteIdc(pGlobals);
if (RT_SUCCESS(rc))
vboxPciDeleteGlobals(pGlobals);
}