C++ OSMemSet函数代码示例

PVRSRV_ERROR OSConnectionPrivateDataInit(IMG_HANDLE *phOsPrivateData, IMG_PVOID pvOSData)
{
	ENV_CONNECTION_DATA *psEnvConnection;
#if defined(SUPPORT_ION)
	ENV_ION_CONNECTION_DATA *psIonConnection;
#endif

	*phOsPrivateData = OSAllocMem(sizeof(ENV_CONNECTION_DATA));

	if (*phOsPrivateData == IMG_NULL)
	{
		PVR_DPF((PVR_DBG_ERROR, "%s: OSAllocMem failed", __FUNCTION__));
		return PVRSRV_ERROR_OUT_OF_MEMORY;
	}

	psEnvConnection = (ENV_CONNECTION_DATA *)*phOsPrivateData;
	OSMemSet(psEnvConnection, 0, sizeof(*psEnvConnection));

	/* Save the pointer to our struct file */
	psEnvConnection->psFile = pvOSData;

#if defined(SUPPORT_ION)
	psIonConnection = (ENV_ION_CONNECTION_DATA *)OSAllocMem(sizeof(ENV_ION_CONNECTION_DATA));
	if (psIonConnection == IMG_NULL)
	{
		PVR_DPF((PVR_DBG_ERROR, "%s: OSAllocMem failed", __FUNCTION__));
		return PVRSRV_ERROR_OUT_OF_MEMORY;
	}
	OSMemSet(psIonConnection, 0, sizeof(*psIonConnection));
	psEnvConnection->psIonData = psIonConnection;
	/*
		We can have more then one connection per process so we need more then
		the PID to have a unique name
	*/
	psEnvConnection->psIonData->psIonDev = IonDevAcquire();
	OSSNPrintf(psEnvConnection->psIonData->azIonClientName, ION_CLIENT_NAME_SIZE, "pvr_ion_client-%p-%d", *phOsPrivateData, OSGetCurrentProcessIDKM());
	psEnvConnection->psIonData->psIonClient =
		ion_client_create(psEnvConnection->psIonData->psIonDev,
						  psEnvConnection->psIonData->azIonClientName);
 
	if (IS_ERR_OR_NULL(psEnvConnection->psIonData->psIonClient))
	{
		PVR_DPF((PVR_DBG_ERROR, "OSConnectionPrivateDataInit: Couldn't create "
								"ion client for per connection data"));
		return PVRSRV_ERROR_OUT_OF_MEMORY;
	}
	psEnvConnection->psIonData->ui32IonClientRefCount = 1;
#endif /* SUPPORT_ION */
	return PVRSRV_OK;
}

PVRSRV_ERROR SysCreateConfigData(PVRSRV_SYSTEM_CONFIG **ppsSysConfig)
{
	PLAT_DATA *psPlatData;
	PVRSRV_ERROR eError;

	psPlatData = OSAllocMem(sizeof(PLAT_DATA));
	OSMemSet(psPlatData, 0, sizeof(PLAT_DATA));

	/* Query the Emu for reg and IRQ information */
	eError = PCIInitDev(psPlatData);
	if (eError != PVRSRV_OK)
	{
		goto e0;
	}

	/* Save data for this device */
	sSysConfig.pasDevices[0].hSysData = (IMG_HANDLE) psPlatData;

#if defined (LMA)
	/* Save private data for the physical memory heaps */
	gsPhysHeapConfig[0].hPrivData = (IMG_HANDLE) psPlatData;
	gsPhysHeapConfig[1].hPrivData = (IMG_HANDLE) psPlatData;
#endif
	*ppsSysConfig = &sSysConfig;

	/* Ion is only supported on UMA builds */
#if (defined(SUPPORT_ION) && (!defined(LMA)))
	IonInit(NULL);
#endif

	gpsPlatData = psPlatData;
	return PVRSRV_OK;
e0:
	return eError;
}

	PVRSRV_ERROR OSFreeMem_Debug_Wrapper(IMG_UINT32 ui32Flags,
										 IMG_UINT32 ui32Size,
										 IMG_PVOID pvCpuVAddr,
										 IMG_HANDLE hBlockAlloc,
										 IMG_CHAR *pszFilename,
										 IMG_UINT32 ui32Line)
	{
		OSMEM_DEBUG_INFO *psInfo;

		
		OSCheckMemDebug(pvCpuVAddr, ui32Size, pszFilename, ui32Line);

		
		OSMemSet(pvCpuVAddr, 0xBF, ui32Size + TEST_BUFFER_PADDING_AFTER);  

		
		psInfo = (OSMEM_DEBUG_INFO *)((IMG_UINT32) pvCpuVAddr - TEST_BUFFER_PADDING_STATUS);

		
		psInfo->uSize = 0;
		psInfo->uSizeParityCheck = 0;
		psInfo->eValid = isFree;
		psInfo->uLineNo = ui32Line;
		debug_strcpy(psInfo->sFileName, pszFilename);

		return OSFreeMem_Debug_Linux_Memory_Allocations(ui32Flags, ui32Size + TEST_BUFFER_PADDING, psInfo, hBlockAlloc, pszFilename, ui32Line);
	}

	PVRSRV_ERROR OSFreeMem_Debug_Wrapper(IMG_UINT32 ui32Flags,
										 IMG_UINT32 ui32Size,
										 IMG_PVOID pvCpuVAddr,
										 IMG_HANDLE hBlockAlloc,
										 IMG_CHAR *pszFilename,
										 IMG_UINT32 ui32Line)
	{
		OSMEM_DEBUG_INFO *psInfo;

		/*check dbginfo (arg pointing to user memory)*/
		OSCheckMemDebug(pvCpuVAddr, ui32Size, pszFilename, ui32Line);

		/*mark memory as freed*/
		OSMemSet(pvCpuVAddr, 0xBF, ui32Size + TEST_BUFFER_PADDING_AFTER);

		/*point to the starting address of the total allocated memory*/
		psInfo = (OSMEM_DEBUG_INFO *)((IMG_UINTPTR_T) pvCpuVAddr - TEST_BUFFER_PADDING_STATUS);

		/*update dbg info struct*/
		psInfo->uSize = 0;
		psInfo->uSizeParityCheck = 0;
		psInfo->eValid = isFree;
		psInfo->uLineNo = ui32Line;
		debug_strcpy(psInfo->sFileName, pszFilename);

		return OSFreeMem_Debug_Linux_Memory_Allocations(ui32Flags, ui32Size + TEST_BUFFER_PADDING, psInfo, hBlockAlloc, pszFilename, ui32Line);
	}

static BT *
_BuildBT (IMG_UINTPTR_T base, IMG_SIZE_T uSize)
{
	BT *pBT;

	if(OSAllocMem(PVRSRV_OS_PAGEABLE_HEAP,
					sizeof(BT),
					(IMG_VOID **)&pBT, IMG_NULL,
					"Boundary Tag") != PVRSRV_OK)
	{
		return IMG_NULL;
	}

	OSMemSet(pBT, 0, sizeof(BT));

#if defined(VALIDATE_ARENA_TEST)
	pBT->ui32BoundaryTagID = ++ui32BoundaryTagID;
#endif

	pBT->type = btt_free;
	pBT->base = base;
	pBT->uSize = uSize;

	return pBT;
}

static PVRSRV_ERROR SysLocateDevices(SYS_DATA *psSysData)
{
#if defined(NO_HARDWARE)
	PVRSRV_ERROR eError;
	IMG_CPU_PHYADDR sCpuPAddr;
#endif

	PVR_UNREFERENCED_PARAMETER(psSysData);


	gsSGXDeviceMap.ui32Flags = 0x0;

#if defined(NO_HARDWARE)


	eError = OSBaseAllocContigMemory(SYS_OMAP3430_SGX_REGS_SIZE,
									 &gsSGXRegsCPUVAddr,
									 &sCpuPAddr);
	if(eError != PVRSRV_OK)
	{
		return eError;
	}
	gsSGXDeviceMap.sRegsCpuPBase = sCpuPAddr;
	gsSGXDeviceMap.sRegsSysPBase = SysCpuPAddrToSysPAddr(gsSGXDeviceMap.sRegsCpuPBase);
	gsSGXDeviceMap.ui32RegsSize = SYS_OMAP3430_SGX_REGS_SIZE;
#if defined(__linux__)

	gsSGXDeviceMap.pvRegsCpuVBase = gsSGXRegsCPUVAddr;
#else

	gsSGXDeviceMap.pvRegsCpuVBase = IMG_NULL;
#endif

	OSMemSet(gsSGXRegsCPUVAddr, 0, SYS_OMAP3430_SGX_REGS_SIZE);




	gsSGXDeviceMap.ui32IRQ = 0;

#else

	gsSGXDeviceMap.sRegsSysPBase.uiAddr = SYS_OMAP3430_SGX_REGS_SYS_PHYS_BASE;
	gsSGXDeviceMap.sRegsCpuPBase = SysSysPAddrToCpuPAddr(gsSGXDeviceMap.sRegsSysPBase);
	gsSGXDeviceMap.ui32RegsSize = SYS_OMAP3430_SGX_REGS_SIZE;

	gsSGXDeviceMap.ui32IRQ = SYS_OMAP3430_SGX_IRQ;

#endif

#if defined(PDUMP)
	{
		static IMG_CHAR pszPDumpDevName[] = "SGXMEM";
		gsSGXDeviceMap.pszPDumpDevName = pszPDumpDevName;
	}
#endif


	return PVRSRV_OK;
}

PVRSRV_ERROR OSPerProcessPrivateDataInit(IMG_HANDLE *phOsPrivateData)
{
	PVRSRV_ERROR eError;
	IMG_HANDLE hBlockAlloc;
	PVRSRV_ENV_PER_PROCESS_DATA *psEnvPerProc;

	eError = OSAllocMem(PVRSRV_OS_NON_PAGEABLE_HEAP,
				sizeof(PVRSRV_ENV_PER_PROCESS_DATA),
				phOsPrivateData,
				&hBlockAlloc,
				"Environment per Process Data");

	if (eError != PVRSRV_OK)
	{
		*phOsPrivateData = IMG_NULL;

		PVR_DPF((PVR_DBG_ERROR, "%s: OSAllocMem failed (%d)", __FUNCTION__, eError));
		return eError;
	}

	psEnvPerProc = (PVRSRV_ENV_PER_PROCESS_DATA *)*phOsPrivateData;
	OSMemSet(psEnvPerProc, 0, sizeof(*psEnvPerProc));

	psEnvPerProc->hBlockAlloc = hBlockAlloc;

	
	LinuxMMapPerProcessConnect(psEnvPerProc);

	return PVRSRV_OK;
}

/*!
******************************************************************************

 @Function	PVRSRVTimeTraceBufferCreate

 @Description

 Create a trace buffer.

 Note: We assume that this will only be called once per process.

 @Input ui32PID : PID of the process that is creating the buffer

 @Return none

******************************************************************************/
PVRSRV_ERROR PVRSRVTimeTraceBufferCreate(IMG_UINT32 ui32PID)
{
	sTimeTraceBuffer *psBuffer;
	PVRSRV_ERROR eError = PVRSRV_OK;

	eError = OSAllocMem(PVRSRV_PAGEABLE_SELECT,
					sizeof(sTimeTraceBuffer) + TIME_TRACE_BUFFER_SIZE,
					(IMG_VOID **)&psBuffer, IMG_NULL,
					"Time Trace Buffer");
	if (eError != PVRSRV_OK)
	{
		PVR_DPF((PVR_DBG_ERROR, "PVRSRVTimeTraceBufferCreate: Error allocating trace buffer"));
		return eError;
	}

	OSMemSet(psBuffer, 0, TIME_TRACE_BUFFER_SIZE);

	if (!HASH_Insert(g_psBufferTable, (IMG_UINTPTR_T) ui32PID, (IMG_UINTPTR_T) psBuffer))
	{
		OSFreeMem(PVRSRV_PAGEABLE_SELECT, sizeof(sTimeTraceBuffer) + TIME_TRACE_BUFFER_SIZE,
				psBuffer, NULL);
		PVR_DPF((PVR_DBG_ERROR, "PVRSRVTimeTraceBufferCreate: Error adding trace buffer to hash table"));
		return PVRSRV_ERROR_OUT_OF_MEMORY;
	}

	return eError;
}

	PVRSRV_ERROR OSAllocMem_Debug_Wrapper(IMG_UINT32 ui32Flags,
										  IMG_UINT32 ui32Size,
										  IMG_PVOID *ppvCpuVAddr,
										  IMG_HANDLE *phBlockAlloc,
										  IMG_CHAR *pszFilename,
										  IMG_UINT32 ui32Line)
	{
		OSMEM_DEBUG_INFO *psInfo;

		PVRSRV_ERROR eError;

		eError = OSAllocMem_Debug_Linux_Memory_Allocations(ui32Flags,
				 ui32Size + TEST_BUFFER_PADDING,
				 ppvCpuVAddr,
				 phBlockAlloc,
				 pszFilename,
				 ui32Line);

		if (eError != PVRSRV_OK)
		{
			return eError;
		}

		OSMemSet((IMG_CHAR *)(*ppvCpuVAddr) + TEST_BUFFER_PADDING_STATUS, 0xBB, ui32Size);
		OSMemSet((IMG_CHAR *)(*ppvCpuVAddr) + ui32Size + TEST_BUFFER_PADDING_STATUS, 0xB2, TEST_BUFFER_PADDING_AFTER);

		/*fill the dbg info struct*/
		psInfo = (OSMEM_DEBUG_INFO *)(*ppvCpuVAddr);

		OSMemSet(psInfo->sGuardRegionBefore, 0xB1, sizeof(psInfo->sGuardRegionBefore));
		debug_strcpy(psInfo->sFileName, pszFilename);
		psInfo->uLineNo = ui32Line;
		psInfo->eValid = isAllocated;
		psInfo->uSize = ui32Size;
		psInfo->uSizeParityCheck = 0x01234567 ^ ui32Size;

		/*point to the user data section*/
		*ppvCpuVAddr = (IMG_PVOID) ((IMG_UINTPTR_T)*ppvCpuVAddr)+TEST_BUFFER_PADDING_STATUS;

#ifdef PVRSRV_LOG_MEMORY_ALLOCS
		/*this is here to simplify the surounding logging macro, that is a expression
		maybe the macro should be an expression */
		PVR_TRACE(("Allocated pointer (after debug info): 0x%p from %s:%d", *ppvCpuVAddr, pszFilename, ui32Line));
#endif

		return PVRSRV_OK;
	}

	PVRSRV_ERROR OSAllocMem_Debug_Wrapper(IMG_UINT32 ui32Flags,
										  IMG_UINT32 ui32Size,
										  IMG_PVOID *ppvCpuVAddr,
										  IMG_HANDLE *phBlockAlloc,
										  IMG_CHAR *pszFilename,
										  IMG_UINT32 ui32Line)
	{
		OSMEM_DEBUG_INFO *psInfo;

		PVRSRV_ERROR eError;

		eError = OSAllocMem_Debug_Linux_Memory_Allocations(ui32Flags,
				 ui32Size + TEST_BUFFER_PADDING,
				 ppvCpuVAddr,
				 phBlockAlloc,
				 pszFilename,
				 ui32Line);

		if (eError != PVRSRV_OK)
		{
			return eError;
		}

		OSMemSet((IMG_CHAR *)(*ppvCpuVAddr) + TEST_BUFFER_PADDING_STATUS, 0xBB, ui32Size);
		OSMemSet((IMG_CHAR *)(*ppvCpuVAddr) + ui32Size + TEST_BUFFER_PADDING_STATUS, 0xB2, TEST_BUFFER_PADDING_AFTER);

		
		psInfo = (OSMEM_DEBUG_INFO *)(*ppvCpuVAddr);

		OSMemSet(psInfo->sGuardRegionBefore, 0xB1, sizeof(psInfo->sGuardRegionBefore));
		debug_strcpy(psInfo->sFileName, pszFilename);
		psInfo->uLineNo = ui32Line;
		psInfo->eValid = isAllocated;
		psInfo->uSize = ui32Size;
		psInfo->uSizeParityCheck = 0x01234567 ^ ui32Size;

		
		*ppvCpuVAddr = (IMG_PVOID) ((IMG_UINT32)*ppvCpuVAddr)+TEST_BUFFER_PADDING_STATUS;

#ifdef PVRSRV_LOG_MEMORY_ALLOCS
		
		PVR_TRACE(("Allocated pointer (after debug info): 0x%X from %s:%d", *ppvCpuVAddr, pszFilename, ui32Line));
#endif

		return PVRSRV_OK;
	}

IMG_BOOL BM_Alloc(void *hDevMemHeap, struct IMG_DEV_VIRTADDR *psDevVAddr,
		  size_t uSize, u32 *pui32Flags, u32 uDevVAddrAlignment,
		  void **phBuf)
{
	struct BM_BUF *pBuf;
	struct BM_CONTEXT *pBMContext;
	struct BM_HEAP *psBMHeap;
	struct SYS_DATA *psSysData;
	u32 uFlags;

	if (pui32Flags == NULL) {
		PVR_DPF(PVR_DBG_ERROR, "BM_Alloc: invalid parameter");
		PVR_DBG_BREAK;
		return IMG_FALSE;
	}

	uFlags = *pui32Flags;

	PVR_DPF(PVR_DBG_MESSAGE,
		 "BM_Alloc (uSize=0x%x, uFlags=0x%x, uDevVAddrAlignment=0x%x)",
		 uSize, uFlags, uDevVAddrAlignment);

	if (SysAcquireData(&psSysData) != PVRSRV_OK)
		return IMG_FALSE;

	psBMHeap = (struct BM_HEAP *)hDevMemHeap;
	pBMContext = psBMHeap->pBMContext;

	if (uDevVAddrAlignment == 0)
		uDevVAddrAlignment = 1;

	if (OSAllocMem(PVRSRV_OS_PAGEABLE_HEAP, sizeof(struct BM_BUF),
		       (void **)&pBuf, NULL) != PVRSRV_OK) {
		PVR_DPF(PVR_DBG_ERROR, "BM_Alloc: BM_Buf alloc FAILED");
		return IMG_FALSE;
	}
	OSMemSet(pBuf, 0, sizeof(struct BM_BUF));

	if (AllocMemory(pBMContext, psBMHeap, psDevVAddr, uSize, uFlags,
			uDevVAddrAlignment, pBuf) != IMG_TRUE) {
		OSFreeMem(PVRSRV_OS_PAGEABLE_HEAP, sizeof(struct BM_BUF), pBuf,
			  NULL);
		PVR_DPF(PVR_DBG_ERROR, "BM_Alloc: AllocMemory FAILED");
		return IMG_FALSE;
	}

	PVR_DPF(PVR_DBG_MESSAGE, "BM_Alloc (uSize=0x%x, uFlags=0x%x)=%08X",
		 uSize, uFlags, pBuf);

	pBuf->ui32RefCount = 1;
	pvr_get_ctx(pBMContext);
	*phBuf = (void *) pBuf;
	*pui32Flags = uFlags | psBMHeap->ui32Attribs;

	return IMG_TRUE;
}

static enum PVRSRV_ERROR AllocDeviceMem(void *hDevCookie, void *hDevMemHeap,
				   u32 ui32Flags, u32 ui32Size,
				   u32 ui32Alignment,
				   struct PVRSRV_KERNEL_MEM_INFO **ppsMemInfo)
{
	struct PVRSRV_KERNEL_MEM_INFO *psMemInfo;
	void *hBuffer;

	struct PVRSRV_MEMBLK *psMemBlock;
	IMG_BOOL bBMError;

	PVR_UNREFERENCED_PARAMETER(hDevCookie);

	*ppsMemInfo = NULL;

	if (OSAllocMem(PVRSRV_PAGEABLE_SELECT,
		       sizeof(struct PVRSRV_KERNEL_MEM_INFO),
		       (void **) &psMemInfo, NULL) != PVRSRV_OK) {
		PVR_DPF(PVR_DBG_ERROR,
			 "AllocDeviceMem: Failed to alloc memory for block");
		return PVRSRV_ERROR_OUT_OF_MEMORY;
	}

	OSMemSet(psMemInfo, 0, sizeof(*psMemInfo));

	psMemBlock = &(psMemInfo->sMemBlk);

	psMemInfo->ui32Flags = ui32Flags | PVRSRV_MEM_RAM_BACKED_ALLOCATION;

	bBMError = BM_Alloc(hDevMemHeap, NULL, ui32Size,
			    &psMemInfo->ui32Flags, ui32Alignment, &hBuffer);

	if (!bBMError) {
		PVR_DPF(PVR_DBG_ERROR, "AllocDeviceMem: BM_Alloc Failed");
		OSFreeMem(PVRSRV_PAGEABLE_SELECT,
			  sizeof(struct PVRSRV_KERNEL_MEM_INFO), psMemInfo,
			  NULL);
		return PVRSRV_ERROR_OUT_OF_MEMORY;
	}

	psMemBlock->sDevVirtAddr = BM_HandleToDevVaddr(hBuffer);
	psMemBlock->hOSMemHandle = BM_HandleToOSMemHandle(hBuffer);

	psMemBlock->hBuffer = (void *)hBuffer;
	psMemInfo->pvLinAddrKM = BM_HandleToCpuVaddr(hBuffer);
	psMemInfo->sDevVAddr = psMemBlock->sDevVirtAddr;
	psMemInfo->ui32AllocSize = ui32Size;

	psMemInfo->pvSysBackupBuffer = NULL;

	*ppsMemInfo = psMemInfo;

	return PVRSRV_OK;
}

IMG_EXPORT PVRSRV_ERROR
PVRSRVAllocSharedSysMemoryKM(PVRSRV_PER_PROCESS_DATA	*psPerProc,
							 IMG_UINT32					ui32Flags,
							 IMG_SIZE_T 				uSize,
							 PVRSRV_KERNEL_MEM_INFO 	**ppsKernelMemInfo)
{
	PVRSRV_KERNEL_MEM_INFO *psKernelMemInfo;

	if(OSAllocMem(PVRSRV_OS_PAGEABLE_HEAP,
				  sizeof(PVRSRV_KERNEL_MEM_INFO),
				  (IMG_VOID **)&psKernelMemInfo, IMG_NULL,
				  "Kernel Memory Info") != PVRSRV_OK)
	{
		PVR_DPF((PVR_DBG_ERROR,"PVRSRVAllocSharedSysMemoryKM: Failed to alloc memory for meminfo"));
		return PVRSRV_ERROR_OUT_OF_MEMORY;
	}

	OSMemSet(psKernelMemInfo, 0, sizeof(*psKernelMemInfo));

	ui32Flags &= ~PVRSRV_HAP_MAPTYPE_MASK;
	ui32Flags |= PVRSRV_HAP_MULTI_PROCESS;
	psKernelMemInfo->ui32Flags = ui32Flags;
	psKernelMemInfo->uAllocSize = uSize;

	if(OSAllocPages(psKernelMemInfo->ui32Flags,
					psKernelMemInfo->uAllocSize,
					(IMG_UINT32)HOST_PAGESIZE(),
					IMG_NULL,
					0,
					IMG_NULL,
					&psKernelMemInfo->pvLinAddrKM,
					&psKernelMemInfo->sMemBlk.hOSMemHandle)
		!= PVRSRV_OK)
	{
		PVR_DPF((PVR_DBG_ERROR, "PVRSRVAllocSharedSysMemoryKM: Failed to alloc memory for block"));
		OSFreeMem(PVRSRV_OS_PAGEABLE_HEAP,
				  sizeof(PVRSRV_KERNEL_MEM_INFO),
				  psKernelMemInfo,
				  0);
		return PVRSRV_ERROR_OUT_OF_MEMORY;
	}

	/* register with the resman */
	psKernelMemInfo->sMemBlk.hResItem =
				ResManRegisterRes(psPerProc->hResManContext,
								  RESMAN_TYPE_SHARED_MEM_INFO,
								  psKernelMemInfo,
								  0,
								  &FreeSharedSysMemCallBack);

	*ppsKernelMemInfo = psKernelMemInfo;

	return PVRSRV_OK;
}

IMG_INTERNAL
PVRSRV_ERROR TLClientCloseStream(IMG_HANDLE hSrvHandle,
		IMG_HANDLE hSD)
{
	PVRSRV_ERROR          eError = PVRSRV_OK;
	TL_STREAM_DESC* psSD = (TL_STREAM_DESC*) hSD;

	PVR_ASSERT(hSrvHandle);
	PVR_ASSERT(hSD);

	/* Check the caller provided connection is valid */
	if(!psSD->hServerSD)
	{
		PVR_DPF((PVR_DBG_ERROR, "TLClientCloseStream: descriptor already closed/not open"));
		return PVRSRV_ERROR_HANDLE_NOT_FOUND;
	}

	/* Check if acquire is outstanding, perform release if it is, ignore result
	 * as there is not much we can do if it is an error other than close */
	if (psSD->uiReadLen != NO_ACQUIRE)
	{
		(void) BridgeTLReleaseData(hSrvHandle, psSD->hServerSD,
									psSD->uiReadOffset, psSD->uiReadLen);
		psSD->uiReadLen = psSD->uiReadOffset = NO_ACQUIRE;
	}

	/* Clean up DevMem resources used for this stream in this client */
	DevmemReleaseCpuVirtAddr(psSD->psUMmemDesc);

	DevmemFree(psSD->psUMmemDesc);

	/* Ignore error, not much that can be done */
	(void) DevmemUnmakeServerExportClientExport(hSrvHandle,
			&psSD->sExportCookie);


	/* Send close to server to clean up kernel mode resources for this
	 * handle and release the memory. */
	eError = BridgeTLCloseStream(hSrvHandle, psSD->hServerSD);
	if (eError != PVRSRV_OK)
	{
		PVR_DPF((PVR_DBG_ERROR, "BridgeTLCloseStream: KM returned %d", eError));
		/*/ Not much we can do with error, fall through to clean up
		 * return eError; */
	}

	OSMemSet(psSD, 0x00, sizeof(TL_STREAM_DESC));
	OSFreeMem (psSD);

	return eError;
}

IMG_INTERNAL
PVRSRV_ERROR _DevmemMemDescAlloc(DEVMEM_MEMDESC **ppsMemDesc)
{
	DEVMEM_MEMDESC *psMemDesc;
	PVRSRV_ERROR eError;

	psMemDesc = OSAllocMem(sizeof(DEVMEM_MEMDESC));

	if (psMemDesc == IMG_NULL)
	{
		eError = PVRSRV_ERROR_OUT_OF_MEMORY;
		goto failAlloc;
	}
	
	/* Structure must be zero'd incase it needs to be freed before it is initialised! */
	OSMemSet(psMemDesc, 0, sizeof(DEVMEM_MEMDESC));

	eError = OSLockCreate(&psMemDesc->hLock, LOCK_TYPE_PASSIVE);
	if (eError != PVRSRV_OK)
	{
		goto failMDLock;
	}

	eError = OSLockCreate(&psMemDesc->sDeviceMemDesc.hLock, LOCK_TYPE_PASSIVE);
	if (eError != PVRSRV_OK)
	{
		goto failDMDLock;
	}

	eError = OSLockCreate(&psMemDesc->sCPUMemDesc.hLock, LOCK_TYPE_PASSIVE);
	if (eError != PVRSRV_OK)
	{
		goto failCMDLock;
	}

	*ppsMemDesc = psMemDesc;

	return PVRSRV_OK;

failCMDLock:
	OSLockDestroy(psMemDesc->sDeviceMemDesc.hLock);
failDMDLock:
	OSLockDestroy(psMemDesc->hLock);
failMDLock:
	OSFreeMem(psMemDesc);
failAlloc:
	PVR_ASSERT(eError != PVRSRV_OK);

	return eError;
}