drivers/gpu/drm/img-rogue/rgxmem.c

/*************************************************************************/ /*!
@File
@Title          RGX memory context management
@Copyright      Copyright (c) Imagination Technologies Ltd. All Rights Reserved
@Description    RGX memory context management
@License        Dual MIT/GPLv2

The contents of this file are subject to the MIT license as set out below.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

Alternatively, the contents of this file may be used under the terms of
the GNU General Public License Version 2 ("GPL") in which case the provisions
of GPL are applicable instead of those above.

If you wish to allow use of your version of this file only under the terms of
GPL, and not to allow others to use your version of this file under the terms
of the MIT license, indicate your decision by deleting the provisions above
and replace them with the notice and other provisions required by GPL as set
out in the file called "GPL-COPYING" included in this distribution. If you do
not delete the provisions above, a recipient may use your version of this file
under the terms of either the MIT license or GPL.

This License is also included in this distribution in the file called
"MIT-COPYING".

EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE AND NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/ /**************************************************************************/

#include "pvr_debug.h"
#include "rgxmem.h"
#include "allocmem.h"
#include "devicemem.h"
#include "devicemem_server_utils.h"
#include "devicemem_pdump.h"
#include "rgxdevice.h"
#include "rgx_fwif_km.h"
#include "rgxfwutils.h"
#include "pdump_km.h"
#include "pdump_physmem.h"
#include "pvr_notifier.h"
#include "pvrsrv.h"
#include "sync_internal.h"
#include "rgx_memallocflags.h"
#include "rgx_bvnc_defs_km.h"
/*
	FIXME:
	For now just get global state, but what we really want is to do
	this per memory context
*/
static IMG_UINT32 gui32CacheOpps = 0;
/* FIXME: End */

typedef struct _SERVER_MMU_CONTEXT_ {
	DEVMEM_MEMDESC *psFWMemContextMemDesc;
	MMU_CONTEXT *psMMUContext;
	IMG_PID uiPID;
	IMG_CHAR szProcessName[RGXMEM_SERVER_MMU_CONTEXT_MAX_NAME];
	DLLIST_NODE sNode;
	PVRSRV_RGXDEV_INFO *psDevInfo;
} SERVER_MMU_CONTEXT;



void RGXMMUCacheInvalidate(PVRSRV_DEVICE_NODE *psDeviceNode,
						   IMG_HANDLE hDeviceData,
						   MMU_LEVEL eMMULevel,
						   IMG_BOOL bUnmap)
{
	PVRSRV_RGXDEV_INFO *psDevInfo = (PVRSRV_RGXDEV_INFO *)psDeviceNode->pvDevice;
	PVR_UNREFERENCED_PARAMETER(bUnmap);

	switch (eMMULevel)
	{
		case MMU_LEVEL_3:	gui32CacheOpps |= RGXFWIF_MMUCACHEDATA_FLAGS_PC;
							break;
		case MMU_LEVEL_2:	gui32CacheOpps |= RGXFWIF_MMUCACHEDATA_FLAGS_PD;
							break;
		case MMU_LEVEL_1:	gui32CacheOpps |= RGXFWIF_MMUCACHEDATA_FLAGS_PT;
							if(!(psDevInfo->sDevFeatureCfg.ui64Features & RGX_FEATURE_SLC_VIVT_BIT_MASK))
							{
								gui32CacheOpps |= RGXFWIF_MMUCACHEDATA_FLAGS_TLB;
							}
							break;
		default:
							PVR_ASSERT(0);
							break;
	}
}

PVRSRV_ERROR RGXMMUCacheInvalidateKick(PVRSRV_DEVICE_NODE *psDevInfo,
                                       IMG_UINT32 *pui32MMUInvalidateUpdate,
                                       IMG_BOOL bInterrupt)
{
	PVRSRV_ERROR eError;

	eError = RGXPreKickCacheCommand(psDevInfo->pvDevice,
	                                RGXFWIF_DM_GP,
	                                pui32MMUInvalidateUpdate,
	                                bInterrupt);

	return eError;
}

PVRSRV_ERROR RGXPreKickCacheCommand(PVRSRV_RGXDEV_INFO *psDevInfo,
                                    RGXFWIF_DM eDM,
                                    IMG_UINT32 *pui32MMUInvalidateUpdate,
                                    IMG_BOOL bInterrupt)
{
	PVRSRV_DEVICE_NODE *psDeviceNode = psDevInfo->psDeviceNode;
	RGXFWIF_KCCB_CMD sFlushCmd;
	PVRSRV_ERROR eError = PVRSRV_OK;

	if (!gui32CacheOpps)
	{
		goto _PVRSRVPowerLock_Exit;
	}

	/* PVRSRVPowerLock guarantees atomicity between commands and global variables consistency.
	 * This is helpful in a scenario with several applications allocating resources. */
	eError = PVRSRVPowerLock(psDeviceNode);

	if (eError != PVRSRV_OK)
	{
		PVR_DPF((PVR_DBG_WARNING, "RGXPreKickCacheCommand: failed to acquire powerlock (%s)",
					PVRSRVGetErrorStringKM(eError)));
		goto _PVRSRVPowerLock_Exit;
	}

	*pui32MMUInvalidateUpdate = psDeviceNode->ui32NextMMUInvalidateUpdate;

	/* Setup cmd and add the device nodes sync object */
	sFlushCmd.eCmdType = RGXFWIF_KCCB_CMD_MMUCACHE;
	sFlushCmd.uCmdData.sMMUCacheData.ui32MMUCacheSyncUpdateValue = psDeviceNode->ui32NextMMUInvalidateUpdate;
	SyncPrimGetFirmwareAddr(psDeviceNode->psMMUCacheSyncPrim,
	                        &sFlushCmd.uCmdData.sMMUCacheData.sMMUCacheSync.ui32Addr);

	/* Set the update value for the next kick */
	psDeviceNode->ui32NextMMUInvalidateUpdate++;

	/* Set which memory context this command is for (all ctxs for now) */
	if(psDevInfo->sDevFeatureCfg.ui64Features & RGX_FEATURE_SLC_VIVT_BIT_MASK)
	{
		gui32CacheOpps |= RGXFWIF_MMUCACHEDATA_FLAGS_CTX_ALL;
	}
	/* Indicate the firmware should signal command completion to the host */
	if(bInterrupt)
	{
		gui32CacheOpps |= RGXFWIF_MMUCACHEDATA_FLAGS_INTERRUPT;
	}
#if 0
	sFlushCmd.uCmdData.sMMUCacheData.psMemoryContext = ???
#endif

	PDUMPPOWCMDSTART();
	eError = PVRSRVSetDevicePowerStateKM(psDeviceNode,
										 PVRSRV_DEV_POWER_STATE_ON,
										 IMG_FALSE);
	PDUMPPOWCMDEND();

	if (eError != PVRSRV_OK)
	{
		PVR_DPF((PVR_DBG_WARNING, "RGXPreKickCacheCommand: failed to transition RGX to ON (%s)",
					PVRSRVGetErrorStringKM(eError)));

		goto _PVRSRVSetDevicePowerStateKM_Exit;
	}

	sFlushCmd.uCmdData.sMMUCacheData.ui32Flags = gui32CacheOpps;

#if defined(PDUMP)
	PDUMPCOMMENTWITHFLAGS(PDUMP_FLAGS_CONTINUOUS,
	                      "Submit MMU flush and invalidate (flags = 0x%08x)",
	                      gui32CacheOpps);
#endif

	gui32CacheOpps = 0;

	/* Schedule MMU cache command */
	eError = RGXSendCommand(psDevInfo,
	                           eDM,
	                           &sFlushCmd,
	                           sizeof(RGXFWIF_KCCB_CMD),
	                           PDUMP_FLAGS_CONTINUOUS);

	if (eError != PVRSRV_OK)
	{
		PVR_DPF((PVR_DBG_ERROR,"RGXPreKickCacheCommand: Failed to schedule MMU "
		                       "cache command to DM=%d with error (%u)", eDM, eError));
	}

_PVRSRVSetDevicePowerStateKM_Exit:
	PVRSRVPowerUnlock(psDeviceNode);

_PVRSRVPowerLock_Exit:
	return eError;
}

#if defined(SUPPORT_PAGE_FAULT_DEBUG)
/* page fault debug is the only current use case for needing to find process info
 * after that process device memory context has been destroyed
 */

typedef struct _UNREGISTERED_MEMORY_CONTEXT_
{
	IMG_PID uiPID;
	IMG_CHAR szProcessName[RGXMEM_SERVER_MMU_CONTEXT_MAX_NAME];
	IMG_DEV_PHYADDR sPCDevPAddr;
} UNREGISTERED_MEMORY_CONTEXT;

/* must be a power of two */
#define UNREGISTERED_MEMORY_CONTEXTS_HISTORY_SIZE (1 << 3)

static UNREGISTERED_MEMORY_CONTEXT gasUnregisteredMemCtxs[UNREGISTERED_MEMORY_CONTEXTS_HISTORY_SIZE];
static IMG_UINT32 gui32UnregisteredMemCtxsHead = 0;

/* record a device memory context being unregistered.
 * the list of unregistered contexts can be used to find the PID and process name
 * belonging to a memory context which has been destroyed
 */
static void _RecordUnregisteredMemoryContext(PVRSRV_RGXDEV_INFO *psDevInfo, SERVER_MMU_CONTEXT *psServerMMUContext)
{
	UNREGISTERED_MEMORY_CONTEXT *psRecord;

	OSLockAcquire(psDevInfo->hMMUCtxUnregLock);

	psRecord = &gasUnregisteredMemCtxs[gui32UnregisteredMemCtxsHead];

	gui32UnregisteredMemCtxsHead = (gui32UnregisteredMemCtxsHead + 1)
					& (UNREGISTERED_MEMORY_CONTEXTS_HISTORY_SIZE - 1);

	OSLockRelease(psDevInfo->hMMUCtxUnregLock);

	psRecord->uiPID = psServerMMUContext->uiPID;
	if (MMU_AcquireBaseAddr(psServerMMUContext->psMMUContext, &psRecord->sPCDevPAddr) != PVRSRV_OK)
	{
		PVR_LOG(("_RecordUnregisteredMemoryContext: Failed to get PC address for memory context"));
	}
	OSStringNCopy(psRecord->szProcessName, psServerMMUContext->szProcessName, sizeof(psRecord->szProcessName));
	psRecord->szProcessName[sizeof(psRecord->szProcessName) - 1] = '\0';
}

#endif

void RGXUnregisterMemoryContext(IMG_HANDLE hPrivData)
{
	SERVER_MMU_CONTEXT *psServerMMUContext = hPrivData;
	PVRSRV_RGXDEV_INFO *psDevInfo = psServerMMUContext->psDevInfo;

	OSWRLockAcquireWrite(psDevInfo->hMemoryCtxListLock);
	dllist_remove_node(&psServerMMUContext->sNode);
	OSWRLockReleaseWrite(psDevInfo->hMemoryCtxListLock);

#if defined(SUPPORT_PAGE_FAULT_DEBUG)
	_RecordUnregisteredMemoryContext(psDevInfo, psServerMMUContext);
#endif

	/*
	 * Release the page catalogue address acquired in RGXRegisterMemoryContext().
	 */
	MMU_ReleaseBaseAddr(NULL /* FIXME */);
	
	/*
	 * Free the firmware memory context.
	 */
	DevmemFwFree(psDevInfo, psServerMMUContext->psFWMemContextMemDesc);

	OSFreeMem(psServerMMUContext);
}


/*
 * RGXRegisterMemoryContext
 */ 
PVRSRV_ERROR RGXRegisterMemoryContext(PVRSRV_DEVICE_NODE	*psDeviceNode,
									  MMU_CONTEXT			*psMMUContext,
									  IMG_HANDLE			*hPrivData)
{
	PVRSRV_ERROR			eError;
	PVRSRV_RGXDEV_INFO 		*psDevInfo = psDeviceNode->pvDevice;
	DEVMEM_FLAGS_T			uiFWMemContextMemAllocFlags;
	RGXFWIF_FWMEMCONTEXT	*psFWMemContext;
	DEVMEM_MEMDESC			*psFWMemContextMemDesc;
	SERVER_MMU_CONTEXT *psServerMMUContext;

	if (psDevInfo->psKernelMMUCtx == NULL)
	{
		/*
		 * This must be the creation of the Kernel memory context. Take a copy
		 * of the MMU context for use when programming the BIF.
		 */ 
		psDevInfo->psKernelMMUCtx = psMMUContext;
	}
	else
	{
		psServerMMUContext = OSAllocMem(sizeof(*psServerMMUContext));
		if (psServerMMUContext == NULL)
		{
			eError = PVRSRV_ERROR_OUT_OF_MEMORY;
			goto fail_alloc_server_ctx;
		}

		psServerMMUContext->psDevInfo = psDevInfo;

		/*
		 * This FW MemContext is only mapped into kernel for initialisation purposes.
		 * Otherwise this allocation is only used by the FW.
		 * Therefore the GPU cache doesn't need coherency,
		 * and write-combine is suffice on the CPU side (WC buffer will be flushed at any kick)
		 */
		uiFWMemContextMemAllocFlags = PVRSRV_MEMALLOCFLAG_DEVICE_FLAG(PMMETA_PROTECT) |
										PVRSRV_MEMALLOCFLAG_DEVICE_FLAG(FIRMWARE_CACHED) |
										PVRSRV_MEMALLOCFLAG_GPU_READABLE |
										PVRSRV_MEMALLOCFLAG_GPU_WRITEABLE |
										PVRSRV_MEMALLOCFLAG_GPU_CACHE_INCOHERENT |
										PVRSRV_MEMALLOCFLAG_CPU_READABLE |
										PVRSRV_MEMALLOCFLAG_CPU_WRITEABLE |
										PVRSRV_MEMALLOCFLAG_CPU_WRITE_COMBINE |
										PVRSRV_MEMALLOCFLAG_KERNEL_CPU_MAPPABLE;

		/*
			Allocate device memory for the firmware memory context for the new
			application.
		*/
		PDUMPCOMMENT("Allocate RGX firmware memory context");
		/* FIXME: why cache-consistent? */
		eError = DevmemFwAllocate(psDevInfo,
								sizeof(*psFWMemContext),
								uiFWMemContextMemAllocFlags,
								"FwMemoryContext",
								&psFWMemContextMemDesc);

		if (eError != PVRSRV_OK)
		{
			PVR_DPF((PVR_DBG_ERROR,"RGXRegisterMemoryContext: Failed to allocate firmware memory context (%u)",
					eError));
			goto fail_alloc_fw_ctx;
		}
		
		/*
			Temporarily map the firmware memory context to the kernel.
		*/
		eError = DevmemAcquireCpuVirtAddr(psFWMemContextMemDesc,
										  (void **)&psFWMemContext);
		if (eError != PVRSRV_OK)
		{
			PVR_DPF((PVR_DBG_ERROR,"RGXRegisterMemoryContext: Failed to map firmware memory context (%u)",
					eError));
			goto fail_acquire_cpu_addr;
		}
		
		/*
		 * Write the new memory context's page catalogue into the firmware memory
		 * context for the client.
		 */
		eError = MMU_AcquireBaseAddr(psMMUContext, &psFWMemContext->sPCDevPAddr);
		if (eError != PVRSRV_OK)
		{
			PVR_DPF((PVR_DBG_ERROR,"RGXRegisterMemoryContext: Failed to acquire Page Catalogue address (%u)",
					eError));
			DevmemReleaseCpuVirtAddr(psFWMemContextMemDesc);
			goto fail_acquire_base_addr;
		}

		/*
		 * Set default values for the rest of the structure.
		 */
		psFWMemContext->uiPageCatBaseRegID = -1;
		psFWMemContext->uiBreakpointAddr = 0;
		psFWMemContext->uiBPHandlerAddr = 0;
		psFWMemContext->uiBreakpointCtl = 0;

#if defined(SUPPORT_GPUVIRT_VALIDATION)
{
		IMG_UINT32 ui32OSid = 0, ui32OSidReg = 0;
        IMG_BOOL   bOSidAxiProt;

        MMU_GetOSids(psMMUContext, &ui32OSid, &ui32OSidReg, &bOSidAxiProt);

        psFWMemContext->ui32OSid     = ui32OSidReg;
        psFWMemContext->bOSidAxiProt = bOSidAxiProt;
}
#endif

#if defined(PDUMP)
		{
			IMG_CHAR			aszName[PHYSMEM_PDUMP_MEMSPNAME_SYMB_ADDR_MAX_LENGTH];
			IMG_DEVMEM_OFFSET_T uiOffset = 0;

			/*
			 * Dump the Mem context allocation
			 */
			DevmemPDumpLoadMem(psFWMemContextMemDesc, 0, sizeof(*psFWMemContext), PDUMP_FLAGS_CONTINUOUS);
			

			/*
			 * Obtain a symbolic addr of the mem context structure
			 */
			eError = DevmemPDumpPageCatBaseToSAddr(psFWMemContextMemDesc, 
												   &uiOffset, 
												   aszName, 
												   PHYSMEM_PDUMP_MEMSPNAME_SYMB_ADDR_MAX_LENGTH);

			if (eError != PVRSRV_OK)
			{
				PVR_DPF((PVR_DBG_ERROR,"RGXRegisterMemoryContext: Failed to generate a Dump Page Catalogue address (%u)",
						eError));
				DevmemReleaseCpuVirtAddr(psFWMemContextMemDesc);
				goto fail_pdump_cat_base_addr;
			}

			/*
			 * Dump the Page Cat tag in the mem context (symbolic address)
			 */
			eError = MMU_PDumpWritePageCatBase(psMMUContext,
												aszName,
												uiOffset,
												8, /* 64-bit register write */
												0,
												0,
												0);
			if (eError != PVRSRV_OK)
			{
				PVR_DPF((PVR_DBG_ERROR,"RGXRegisterMemoryContext: Failed to acquire Page Catalogue address (%u)",
						eError));
				DevmemReleaseCpuVirtAddr(psFWMemContextMemDesc);
				goto fail_pdump_cat_base;
			}
		}
#endif

		/*
		 * Release kernel address acquired above.
		 */
		DevmemReleaseCpuVirtAddr(psFWMemContextMemDesc);

		/*
		 * Store the process information for this device memory context
		 * for use with the host page-fault analysis.
		 */
		psServerMMUContext->uiPID = OSGetCurrentClientProcessIDKM();
		psServerMMUContext->psMMUContext = psMMUContext;
		psServerMMUContext->psFWMemContextMemDesc = psFWMemContextMemDesc;
		if (OSSNPrintf(psServerMMUContext->szProcessName,
						RGXMEM_SERVER_MMU_CONTEXT_MAX_NAME,
						"%s",
						OSGetCurrentClientProcessNameKM()) == RGXMEM_SERVER_MMU_CONTEXT_MAX_NAME)
		{
			psServerMMUContext->szProcessName[RGXMEM_SERVER_MMU_CONTEXT_MAX_NAME-1] = '\0';
		}

		PDUMPCOMMENTWITHFLAGS(PDUMP_FLAGS_CONTINUOUS, "New memory context: Process Name: %s PID: %u (0x%08X)",
										psServerMMUContext->szProcessName,
										psServerMMUContext->uiPID,
										psServerMMUContext->uiPID);

		OSWRLockAcquireWrite(psDevInfo->hMemoryCtxListLock);
		dllist_add_to_tail(&psDevInfo->sMemoryContextList, &psServerMMUContext->sNode);
		OSWRLockReleaseWrite(psDevInfo->hMemoryCtxListLock);

		MMU_SetDeviceData(psMMUContext, psFWMemContextMemDesc);
		*hPrivData = psServerMMUContext;
	}
			
	return PVRSRV_OK;

#if defined(PDUMP)
fail_pdump_cat_base:
fail_pdump_cat_base_addr:
	MMU_ReleaseBaseAddr(NULL);
#endif
fail_acquire_base_addr:
	/* Done before jumping to the fail point as the release is done before exit */
fail_acquire_cpu_addr:
	DevmemFwFree(psDevInfo, psServerMMUContext->psFWMemContextMemDesc);
fail_alloc_fw_ctx:
	OSFreeMem(psServerMMUContext);
fail_alloc_server_ctx:
	PVR_ASSERT(eError != PVRSRV_OK);
	return eError;
}

DEVMEM_MEMDESC *RGXGetFWMemDescFromMemoryContextHandle(IMG_HANDLE hPriv)
{
	SERVER_MMU_CONTEXT *psMMUContext = (SERVER_MMU_CONTEXT *) hPriv;

	return psMMUContext->psFWMemContextMemDesc;
}

void RGXCheckFaultAddress(PVRSRV_RGXDEV_INFO *psDevInfo,
				IMG_DEV_VIRTADDR *psDevVAddr,
				IMG_DEV_PHYADDR *psDevPAddr,
				DUMPDEBUG_PRINTF_FUNC *pfnDumpDebugPrintf,
				void *pvDumpDebugFile)
{
	IMG_DEV_PHYADDR sPCDevPAddr;
	DLLIST_NODE *psNode, *psNext;

	OSWRLockAcquireRead(psDevInfo->hMemoryCtxListLock);

	dllist_foreach_node(&psDevInfo->sMemoryContextList, psNode, psNext)
	{
		SERVER_MMU_CONTEXT *psServerMMUContext =
			IMG_CONTAINER_OF(psNode, SERVER_MMU_CONTEXT, sNode);

		if (MMU_AcquireBaseAddr(psServerMMUContext->psMMUContext, &sPCDevPAddr) != PVRSRV_OK)
		{
			PVR_LOG(("Failed to get PC address for memory context"));
			continue;
		}

		if (psDevPAddr->uiAddr == sPCDevPAddr.uiAddr)
		{
			PVR_DUMPDEBUG_LOG("Found memory context (PID = %d, %s)",
							   psServerMMUContext->uiPID,
							   psServerMMUContext->szProcessName);

			MMU_CheckFaultAddress(psServerMMUContext->psMMUContext, psDevVAddr,
						pfnDumpDebugPrintf, pvDumpDebugFile);
			break;
		}
	}

	/* Lastly check for fault in the kernel allocated memory */
	if (MMU_AcquireBaseAddr(psDevInfo->psKernelMMUCtx, &sPCDevPAddr) != PVRSRV_OK)
	{
		PVR_LOG(("Failed to get PC address for kernel memory context"));
	}

	if (psDevPAddr->uiAddr == sPCDevPAddr.uiAddr)
	{
		MMU_CheckFaultAddress(psDevInfo->psKernelMMUCtx, psDevVAddr,
					pfnDumpDebugPrintf, pvDumpDebugFile);
	}

	OSWRLockReleaseRead(psDevInfo->hMemoryCtxListLock);
}

/* given the physical address of a page catalogue, searches for a corresponding
 * MMU context and if found, provides the caller details of the process.
 * Returns IMG_TRUE if a process is found.
 */
IMG_BOOL RGXPCAddrToProcessInfo(PVRSRV_RGXDEV_INFO *psDevInfo, IMG_DEV_PHYADDR sPCAddress,
								RGXMEM_PROCESS_INFO *psInfo)
{
	IMG_BOOL bRet = IMG_FALSE;
	DLLIST_NODE *psNode, *psNext;
	SERVER_MMU_CONTEXT *psServerMMUContext = NULL;

	/* check if the input PC addr corresponds to an active memory context */
	dllist_foreach_node(&psDevInfo->sMemoryContextList, psNode, psNext)
	{
		SERVER_MMU_CONTEXT *psThisMMUContext =
			IMG_CONTAINER_OF(psNode, SERVER_MMU_CONTEXT, sNode);
		IMG_DEV_PHYADDR sPCDevPAddr;

		if (MMU_AcquireBaseAddr(psThisMMUContext->psMMUContext, &sPCDevPAddr) != PVRSRV_OK)
		{
			PVR_LOG(("Failed to get PC address for memory context"));
			continue;
		}

		if (sPCAddress.uiAddr == sPCDevPAddr.uiAddr)
		{
			psServerMMUContext = psThisMMUContext;
			break;
		}
	}

	if(psServerMMUContext != NULL)
	{
		psInfo->uiPID = psServerMMUContext->uiPID;
		OSStringNCopy(psInfo->szProcessName, psServerMMUContext->szProcessName, sizeof(psInfo->szProcessName));
		psInfo->szProcessName[sizeof(psInfo->szProcessName) - 1] = '\0';
		psInfo->bUnregistered = IMG_FALSE;
		bRet = IMG_TRUE;
	}
	/* else check if the input PC addr corresponds to the firmware */
	else
	{
		IMG_DEV_PHYADDR sKernelPCDevPAddr;
		PVRSRV_ERROR eError;

		eError = MMU_AcquireBaseAddr(psDevInfo->psKernelMMUCtx, &sKernelPCDevPAddr);

		if(eError != PVRSRV_OK)
		{
			PVR_LOG(("Failed to get PC address for kernel memory context"));
		}
		else
		{
			if(sPCAddress.uiAddr == sKernelPCDevPAddr.uiAddr)
			{
				psInfo->uiPID = RGXMEM_SERVER_PID_FIRMWARE;
				OSStringNCopy(psInfo->szProcessName, "Firmware", sizeof(psInfo->szProcessName));
				psInfo->szProcessName[sizeof(psInfo->szProcessName) - 1] = '\0';
				psInfo->bUnregistered = IMG_FALSE;
				bRet = IMG_TRUE;
			}
		}
	}
#if defined(SUPPORT_PAGE_FAULT_DEBUG)
	if(bRet == IMG_FALSE)
	{
		/* no active memory context found with the given PC address.
		 * Check the list of most recently freed memory contexts.
		 */
		 IMG_UINT32 i;

		 OSLockAcquire(psDevInfo->hMMUCtxUnregLock);

		/* iterate through the list of unregistered memory contexts
		 * from newest (one before the head) to the oldest (the current head)
		 */
		i = gui32UnregisteredMemCtxsHead;

		do
		{
			UNREGISTERED_MEMORY_CONTEXT *psRecord;

			i ? i-- : (i = (UNREGISTERED_MEMORY_CONTEXTS_HISTORY_SIZE - 1));

			psRecord = &gasUnregisteredMemCtxs[i];

			if(psRecord->sPCDevPAddr.uiAddr == sPCAddress.uiAddr)
			{
				psInfo->uiPID = psRecord->uiPID;
				OSStringNCopy(psInfo->szProcessName, psRecord->szProcessName, sizeof(psInfo->szProcessName)-1);
				psInfo->szProcessName[sizeof(psInfo->szProcessName) - 1] = '\0';
				psInfo->bUnregistered = IMG_TRUE;
				bRet = IMG_TRUE;
				break;
			}
		} while(i != gui32UnregisteredMemCtxsHead);

		OSLockRelease(psDevInfo->hMMUCtxUnregLock);

	}
#endif
	return bRet;
}

IMG_BOOL RGXPCPIDToProcessInfo(PVRSRV_RGXDEV_INFO *psDevInfo, IMG_PID uiPID,
								RGXMEM_PROCESS_INFO *psInfo)
{
	IMG_BOOL bRet = IMG_FALSE;
	DLLIST_NODE *psNode, *psNext;
	SERVER_MMU_CONTEXT *psServerMMUContext = NULL;

	/* check if the input PID corresponds to an active memory context */
	dllist_foreach_node(&psDevInfo->sMemoryContextList, psNode, psNext)
	{
		SERVER_MMU_CONTEXT *psThisMMUContext =
			IMG_CONTAINER_OF(psNode, SERVER_MMU_CONTEXT, sNode);

		if (psThisMMUContext->uiPID == uiPID)
		{
			psServerMMUContext = psThisMMUContext;
			break;
		}
	}

	if(psServerMMUContext != NULL)
	{
		psInfo->uiPID = psServerMMUContext->uiPID;
		OSStringNCopy(psInfo->szProcessName, psServerMMUContext->szProcessName, sizeof(psInfo->szProcessName));
		psInfo->szProcessName[sizeof(psInfo->szProcessName) - 1] = '\0';
		psInfo->bUnregistered = IMG_FALSE;
		bRet = IMG_TRUE;
	}
	/* else check if the input PID corresponds to the firmware */
	else if(uiPID == RGXMEM_SERVER_PID_FIRMWARE)
	{
		psInfo->uiPID = RGXMEM_SERVER_PID_FIRMWARE;
		OSStringNCopy(psInfo->szProcessName, "Firmware", sizeof(psInfo->szProcessName));
		psInfo->szProcessName[sizeof(psInfo->szProcessName) - 1] = '\0';
		psInfo->bUnregistered = IMG_FALSE;
		bRet = IMG_TRUE;
	}
#if defined(SUPPORT_PAGE_FAULT_DEBUG)
	/* if the PID didn't correspond to an active context or the
	 * FW address then see if it matches a recently unregistered context
	 */
	if(bRet == IMG_FALSE)
	{
		 IMG_UINT32 i;

		 OSLockAcquire(psDevInfo->hMMUCtxUnregLock);

		 for(i = (gui32UnregisteredMemCtxsHead > 0) ? (gui32UnregisteredMemCtxsHead - 1) :
		 					UNREGISTERED_MEMORY_CONTEXTS_HISTORY_SIZE;
							i != gui32UnregisteredMemCtxsHead; i--)
		{
			UNREGISTERED_MEMORY_CONTEXT *psRecord = &gasUnregisteredMemCtxs[i];

			if(psRecord->uiPID == uiPID)
			{
				psInfo->uiPID = psRecord->uiPID;
				OSStringNCopy(psInfo->szProcessName, psRecord->szProcessName, sizeof(psInfo->szProcessName)-1);
				psInfo->szProcessName[sizeof(psInfo->szProcessName) - 1] = '\0';
				psInfo->bUnregistered = IMG_TRUE;
				bRet = IMG_TRUE;
				break;
			}
		}

		OSLockRelease(psDevInfo->hMMUCtxUnregLock);

	}
#endif
	return bRet;
}

/******************************************************************************
 End of file (rgxmem.c)
******************************************************************************/