/*************************************************************************/ /*!
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@File
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@Title Event Object
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@Copyright Copyright (c) Imagination Technologies Ltd. All Rights Reserved
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@License Dual MIT/GPLv2
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The contents of this file are subject to the MIT license as set out below.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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Alternatively, the contents of this file may be used under the terms of
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the GNU General Public License Version 2 ("GPL") in which case the provisions
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of GPL are applicable instead of those above.
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If you wish to allow use of your version of this file only under the terms of
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GPL, and not to allow others to use your version of this file under the terms
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of the MIT license, indicate your decision by deleting the provisions above
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and replace them with the notice and other provisions required by GPL as set
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out in the file called "GPL-COPYING" included in this distribution. If you do
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not delete the provisions above, a recipient may use your version of this file
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under the terms of either the MIT license or GPL.
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This License is also included in this distribution in the file called
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"MIT-COPYING".
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EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
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PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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PURPOSE AND NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/ /**************************************************************************/
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#include <asm/io.h>
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#include <asm/page.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <linux/string.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <asm/hardirq.h>
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#include <linux/timer.h>
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#include <linux/capability.h>
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#include <linux/uaccess.h>
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#include "img_types.h"
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#include "pvrsrv_error.h"
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#include "allocmem.h"
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#include "event.h"
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#include "pvr_debug.h"
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#include "pvrsrv.h"
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#include "osfunc.h"
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/* Returns pointer to task_struct that belongs to thread which acquired
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* bridge lock. */
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extern struct task_struct *BridgeLockGetOwner(void);
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extern IMG_BOOL BridgeLockIsLocked(void);
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typedef struct PVRSRV_LINUX_EVENT_OBJECT_LIST_TAG
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{
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rwlock_t sLock;
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struct list_head sList;
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} PVRSRV_LINUX_EVENT_OBJECT_LIST;
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typedef struct PVRSRV_LINUX_EVENT_OBJECT_TAG
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{
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atomic_t sTimeStamp;
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IMG_UINT32 ui32TimeStampPrevious;
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#if defined(DEBUG)
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IMG_UINT ui32Stats;
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#endif
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wait_queue_head_t sWait;
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struct list_head sList;
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PVRSRV_LINUX_EVENT_OBJECT_LIST *psLinuxEventObjectList;
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} PVRSRV_LINUX_EVENT_OBJECT;
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/*!
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******************************************************************************
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@Function LinuxEventObjectListCreate
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@Description
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Linux wait object list creation
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@Output hOSEventKM : Pointer to the event object list handle
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@Return PVRSRV_ERROR : Error code
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******************************************************************************/
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PVRSRV_ERROR LinuxEventObjectListCreate(IMG_HANDLE *phEventObjectList)
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{
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PVRSRV_LINUX_EVENT_OBJECT_LIST *psEvenObjectList;
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psEvenObjectList = OSAllocMem(sizeof(*psEvenObjectList));
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if (psEvenObjectList == NULL)
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{
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PVR_DPF((PVR_DBG_ERROR, "LinuxEventObjectCreate: failed to allocate memory for event list"));
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return PVRSRV_ERROR_OUT_OF_MEMORY;
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}
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INIT_LIST_HEAD(&psEvenObjectList->sList);
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rwlock_init(&psEvenObjectList->sLock);
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*phEventObjectList = (IMG_HANDLE *) psEvenObjectList;
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return PVRSRV_OK;
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}
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/*!
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******************************************************************************
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@Function LinuxEventObjectListDestroy
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@Description
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Linux wait object list destruction
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@Input hOSEventKM : Event object list handle
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@Return PVRSRV_ERROR : Error code
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******************************************************************************/
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PVRSRV_ERROR LinuxEventObjectListDestroy(IMG_HANDLE hEventObjectList)
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{
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PVRSRV_LINUX_EVENT_OBJECT_LIST *psEvenObjectList = (PVRSRV_LINUX_EVENT_OBJECT_LIST *) hEventObjectList ;
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if(psEvenObjectList)
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{
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if (!list_empty(&psEvenObjectList->sList))
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{
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PVR_DPF((PVR_DBG_ERROR, "LinuxEventObjectListDestroy: Event List is not empty"));
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return PVRSRV_ERROR_UNABLE_TO_DESTROY_EVENT;
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}
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OSFreeMem(psEvenObjectList);
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/*not nulling pointer, copy on stack*/
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}
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return PVRSRV_OK;
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}
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/*!
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******************************************************************************
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@Function LinuxEventObjectDelete
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@Description
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Linux wait object removal
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@Input hOSEventObject : Event object handle
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@Return PVRSRV_ERROR : Error code
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******************************************************************************/
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PVRSRV_ERROR LinuxEventObjectDelete(IMG_HANDLE hOSEventObject)
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{
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if(hOSEventObject)
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{
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PVRSRV_LINUX_EVENT_OBJECT *psLinuxEventObject = (PVRSRV_LINUX_EVENT_OBJECT *)hOSEventObject;
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PVRSRV_LINUX_EVENT_OBJECT_LIST *psLinuxEventObjectList = psLinuxEventObject->psLinuxEventObjectList;
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write_lock_bh(&psLinuxEventObjectList->sLock);
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list_del(&psLinuxEventObject->sList);
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write_unlock_bh(&psLinuxEventObjectList->sLock);
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#if defined(DEBUG)
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// PVR_DPF((PVR_DBG_MESSAGE, "LinuxEventObjectDelete: Event object waits: %u", psLinuxEventObject->ui32Stats));
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#endif
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OSFreeMem(psLinuxEventObject);
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/*not nulling pointer, copy on stack*/
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return PVRSRV_OK;
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}
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return PVRSRV_ERROR_UNABLE_TO_DESTROY_EVENT;
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}
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/*!
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******************************************************************************
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@Function LinuxEventObjectAdd
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@Description
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Linux wait object addition
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@Input hOSEventObjectList : Event object list handle
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@Output phOSEventObject : Pointer to the event object handle
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@Return PVRSRV_ERROR : Error code
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******************************************************************************/
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PVRSRV_ERROR LinuxEventObjectAdd(IMG_HANDLE hOSEventObjectList, IMG_HANDLE *phOSEventObject)
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{
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PVRSRV_LINUX_EVENT_OBJECT *psLinuxEventObject;
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PVRSRV_LINUX_EVENT_OBJECT_LIST *psLinuxEventObjectList = (PVRSRV_LINUX_EVENT_OBJECT_LIST*)hOSEventObjectList;
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/* allocate completion variable */
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psLinuxEventObject = OSAllocMem(sizeof(*psLinuxEventObject));
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if (psLinuxEventObject == NULL)
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{
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PVR_DPF((PVR_DBG_ERROR, "LinuxEventObjectAdd: failed to allocate memory "));
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return PVRSRV_ERROR_OUT_OF_MEMORY;
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}
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INIT_LIST_HEAD(&psLinuxEventObject->sList);
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atomic_set(&psLinuxEventObject->sTimeStamp, 0);
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psLinuxEventObject->ui32TimeStampPrevious = 0;
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#if defined(DEBUG)
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psLinuxEventObject->ui32Stats = 0;
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#endif
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init_waitqueue_head(&psLinuxEventObject->sWait);
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psLinuxEventObject->psLinuxEventObjectList = psLinuxEventObjectList;
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write_lock_bh(&psLinuxEventObjectList->sLock);
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list_add(&psLinuxEventObject->sList, &psLinuxEventObjectList->sList);
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write_unlock_bh(&psLinuxEventObjectList->sLock);
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*phOSEventObject = psLinuxEventObject;
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return PVRSRV_OK;
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}
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/*!
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******************************************************************************
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@Function LinuxEventObjectSignal
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@Description
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Linux wait object signaling function
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@Input hOSEventObjectList : Event object list handle
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@Return PVRSRV_ERROR : Error code
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******************************************************************************/
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PVRSRV_ERROR LinuxEventObjectSignal(IMG_HANDLE hOSEventObjectList)
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{
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PVRSRV_LINUX_EVENT_OBJECT *psLinuxEventObject;
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PVRSRV_LINUX_EVENT_OBJECT_LIST *psLinuxEventObjectList = (PVRSRV_LINUX_EVENT_OBJECT_LIST*)hOSEventObjectList;
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struct list_head *psListEntry, *psListEntryTemp, *psList;
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psList = &psLinuxEventObjectList->sList;
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read_lock_bh(&psLinuxEventObjectList->sLock);
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list_for_each_safe(psListEntry, psListEntryTemp, psList)
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{
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psLinuxEventObject = (PVRSRV_LINUX_EVENT_OBJECT *)list_entry(psListEntry, PVRSRV_LINUX_EVENT_OBJECT, sList);
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atomic_inc(&psLinuxEventObject->sTimeStamp);
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wake_up_interruptible(&psLinuxEventObject->sWait);
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}
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read_unlock_bh(&psLinuxEventObjectList->sLock);
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return PVRSRV_OK;
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}
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/*!
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******************************************************************************
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@Function LinuxEventObjectWait
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@Description
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Linux wait object routine
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@Input hOSEventObject : Event object handle
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@Input ui64Timeoutus : Time out value in usec
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@Return PVRSRV_ERROR : Error code
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******************************************************************************/
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PVRSRV_ERROR LinuxEventObjectWait(IMG_HANDLE hOSEventObject, IMG_UINT64 ui64Timeoutus, IMG_BOOL bHoldBridgeLock)
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{
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IMG_UINT32 ui32TimeStamp;
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IMG_BOOL bReleasePVRLock;
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PVRSRV_DATA *psPVRSRVData = PVRSRVGetPVRSRVData();
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IMG_UINT32 ui32Remainder;
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long timeOutJiffies;
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DEFINE_WAIT(sWait);
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PVRSRV_LINUX_EVENT_OBJECT *psLinuxEventObject = (PVRSRV_LINUX_EVENT_OBJECT *) hOSEventObject;
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/* Check if the driver is good shape */
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if (psPVRSRVData->eServicesState != PVRSRV_SERVICES_STATE_OK)
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{
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return PVRSRV_ERROR_TIMEOUT;
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}
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/* usecs_to_jiffies only takes an uint. So if our timeout is bigger than an
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* uint use the msec version. With such a long timeout we really don't need
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* the high resolution of usecs. */
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if (ui64Timeoutus > 0xffffffffULL)
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timeOutJiffies = msecs_to_jiffies(OSDivide64(ui64Timeoutus, 1000, &ui32Remainder));
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else
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timeOutJiffies = usecs_to_jiffies(ui64Timeoutus);
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do
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{
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prepare_to_wait(&psLinuxEventObject->sWait, &sWait, TASK_INTERRUPTIBLE);
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ui32TimeStamp = (IMG_UINT32)atomic_read(&psLinuxEventObject->sTimeStamp);
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if(psLinuxEventObject->ui32TimeStampPrevious != ui32TimeStamp)
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{
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break;
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}
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/* Check thread holds the current PVR/bridge lock before obeying the
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* 'release before deschedule' behaviour. Some threads choose not to
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* hold the bridge lock in their implementation.
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*/
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bReleasePVRLock = (!bHoldBridgeLock && BridgeLockIsLocked() && current == BridgeLockGetOwner());
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if (bReleasePVRLock == IMG_TRUE)
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{
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OSReleaseBridgeLock();
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}
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timeOutJiffies = schedule_timeout(timeOutJiffies);
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if (bReleasePVRLock == IMG_TRUE)
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{
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OSAcquireBridgeLock();
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}
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#if defined(DEBUG)
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psLinuxEventObject->ui32Stats++;
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#endif
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} while (timeOutJiffies);
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finish_wait(&psLinuxEventObject->sWait, &sWait);
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psLinuxEventObject->ui32TimeStampPrevious = ui32TimeStamp;
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return timeOutJiffies ? PVRSRV_OK : PVRSRV_ERROR_TIMEOUT;
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}
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