| /*************************************************************************/ /*! |
| @File |
| @Title Event Object |
| @Copyright Copyright (c) Imagination Technologies Ltd. All Rights Reserved |
| @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 <asm/io.h> |
| #include <asm/page.h> |
| #include <linux/mm.h> |
| #include <linux/slab.h> |
| #include <linux/delay.h> |
| #include <linux/pci.h> |
| |
| #include <linux/string.h> |
| #include <linux/sched.h> |
| #include <linux/interrupt.h> |
| #include <asm/hardirq.h> |
| #include <linux/timer.h> |
| #include <linux/capability.h> |
| #include <asm/uaccess.h> |
| |
| #include "img_types.h" |
| #include "pvrsrv_error.h" |
| #include "allocmem.h" |
| #include "event.h" |
| #include "pvr_debug.h" |
| #include "pvrsrv.h" |
| |
| #include "osfunc.h" |
| |
| /* Returns pointer to task_struct that belongs to thread which acquired |
| * bridge lock. */ |
| extern struct task_struct *BridgeLockGetOwner(void); |
| extern IMG_BOOL BridgeLockIsLocked(void); |
| |
| |
| typedef struct PVRSRV_LINUX_EVENT_OBJECT_LIST_TAG |
| { |
| rwlock_t sLock; |
| struct list_head sList; |
| |
| } PVRSRV_LINUX_EVENT_OBJECT_LIST; |
| |
| |
| typedef struct PVRSRV_LINUX_EVENT_OBJECT_TAG |
| { |
| atomic_t sTimeStamp; |
| IMG_UINT32 ui32TimeStampPrevious; |
| #if defined(DEBUG) |
| IMG_UINT ui32Stats; |
| #endif |
| wait_queue_head_t sWait; |
| struct list_head sList; |
| PVRSRV_LINUX_EVENT_OBJECT_LIST *psLinuxEventObjectList; |
| } PVRSRV_LINUX_EVENT_OBJECT; |
| |
| /*! |
| ****************************************************************************** |
| |
| @Function LinuxEventObjectListCreate |
| |
| @Description |
| |
| Linux wait object list creation |
| |
| @Output hOSEventKM : Pointer to the event object list handle |
| |
| @Return PVRSRV_ERROR : Error code |
| |
| ******************************************************************************/ |
| PVRSRV_ERROR LinuxEventObjectListCreate(IMG_HANDLE *phEventObjectList) |
| { |
| PVRSRV_LINUX_EVENT_OBJECT_LIST *psEvenObjectList; |
| |
| psEvenObjectList = OSAllocMem(sizeof(*psEvenObjectList)); |
| if (psEvenObjectList == NULL) |
| { |
| PVR_DPF((PVR_DBG_ERROR, "LinuxEventObjectCreate: failed to allocate memory for event list")); |
| return PVRSRV_ERROR_OUT_OF_MEMORY; |
| } |
| |
| INIT_LIST_HEAD(&psEvenObjectList->sList); |
| |
| rwlock_init(&psEvenObjectList->sLock); |
| |
| *phEventObjectList = (IMG_HANDLE *) psEvenObjectList; |
| |
| return PVRSRV_OK; |
| } |
| |
| /*! |
| ****************************************************************************** |
| |
| @Function LinuxEventObjectListDestroy |
| |
| @Description |
| |
| Linux wait object list destruction |
| |
| @Input hOSEventKM : Event object list handle |
| |
| @Return PVRSRV_ERROR : Error code |
| |
| ******************************************************************************/ |
| PVRSRV_ERROR LinuxEventObjectListDestroy(IMG_HANDLE hEventObjectList) |
| { |
| |
| PVRSRV_LINUX_EVENT_OBJECT_LIST *psEvenObjectList = (PVRSRV_LINUX_EVENT_OBJECT_LIST *) hEventObjectList ; |
| |
| if(psEvenObjectList) |
| { |
| if (!list_empty(&psEvenObjectList->sList)) |
| { |
| PVR_DPF((PVR_DBG_ERROR, "LinuxEventObjectListDestroy: Event List is not empty")); |
| return PVRSRV_ERROR_UNABLE_TO_DESTROY_EVENT; |
| } |
| OSFreeMem(psEvenObjectList); |
| /*not nulling pointer, copy on stack*/ |
| } |
| return PVRSRV_OK; |
| } |
| |
| |
| /*! |
| ****************************************************************************** |
| |
| @Function LinuxEventObjectDelete |
| |
| @Description |
| |
| Linux wait object removal |
| |
| @Input hOSEventObject : Event object handle |
| |
| @Return PVRSRV_ERROR : Error code |
| |
| ******************************************************************************/ |
| PVRSRV_ERROR LinuxEventObjectDelete(IMG_HANDLE hOSEventObject) |
| { |
| if(hOSEventObject) |
| { |
| PVRSRV_LINUX_EVENT_OBJECT *psLinuxEventObject = (PVRSRV_LINUX_EVENT_OBJECT *)hOSEventObject; |
| PVRSRV_LINUX_EVENT_OBJECT_LIST *psLinuxEventObjectList = psLinuxEventObject->psLinuxEventObjectList; |
| |
| write_lock_bh(&psLinuxEventObjectList->sLock); |
| list_del(&psLinuxEventObject->sList); |
| write_unlock_bh(&psLinuxEventObjectList->sLock); |
| |
| #if defined(DEBUG) |
| // PVR_DPF((PVR_DBG_MESSAGE, "LinuxEventObjectDelete: Event object waits: %u", psLinuxEventObject->ui32Stats)); |
| #endif |
| |
| OSFreeMem(psLinuxEventObject); |
| /*not nulling pointer, copy on stack*/ |
| |
| return PVRSRV_OK; |
| } |
| return PVRSRV_ERROR_UNABLE_TO_DESTROY_EVENT; |
| } |
| |
| /*! |
| ****************************************************************************** |
| |
| @Function LinuxEventObjectAdd |
| |
| @Description |
| |
| Linux wait object addition |
| |
| @Input hOSEventObjectList : Event object list handle |
| @Output phOSEventObject : Pointer to the event object handle |
| |
| @Return PVRSRV_ERROR : Error code |
| |
| ******************************************************************************/ |
| PVRSRV_ERROR LinuxEventObjectAdd(IMG_HANDLE hOSEventObjectList, IMG_HANDLE *phOSEventObject) |
| { |
| PVRSRV_LINUX_EVENT_OBJECT *psLinuxEventObject; |
| PVRSRV_LINUX_EVENT_OBJECT_LIST *psLinuxEventObjectList = (PVRSRV_LINUX_EVENT_OBJECT_LIST*)hOSEventObjectList; |
| |
| /* allocate completion variable */ |
| psLinuxEventObject = OSAllocMem(sizeof(*psLinuxEventObject)); |
| if (psLinuxEventObject == NULL) |
| { |
| PVR_DPF((PVR_DBG_ERROR, "LinuxEventObjectAdd: failed to allocate memory ")); |
| return PVRSRV_ERROR_OUT_OF_MEMORY; |
| } |
| |
| INIT_LIST_HEAD(&psLinuxEventObject->sList); |
| |
| atomic_set(&psLinuxEventObject->sTimeStamp, 0); |
| psLinuxEventObject->ui32TimeStampPrevious = 0; |
| |
| #if defined(DEBUG) |
| psLinuxEventObject->ui32Stats = 0; |
| #endif |
| init_waitqueue_head(&psLinuxEventObject->sWait); |
| |
| psLinuxEventObject->psLinuxEventObjectList = psLinuxEventObjectList; |
| |
| write_lock_bh(&psLinuxEventObjectList->sLock); |
| list_add(&psLinuxEventObject->sList, &psLinuxEventObjectList->sList); |
| write_unlock_bh(&psLinuxEventObjectList->sLock); |
| |
| *phOSEventObject = psLinuxEventObject; |
| |
| return PVRSRV_OK; |
| } |
| |
| /*! |
| ****************************************************************************** |
| |
| @Function LinuxEventObjectSignal |
| |
| @Description |
| |
| Linux wait object signaling function |
| |
| @Input hOSEventObjectList : Event object list handle |
| |
| @Return PVRSRV_ERROR : Error code |
| |
| ******************************************************************************/ |
| PVRSRV_ERROR LinuxEventObjectSignal(IMG_HANDLE hOSEventObjectList) |
| { |
| PVRSRV_LINUX_EVENT_OBJECT *psLinuxEventObject; |
| PVRSRV_LINUX_EVENT_OBJECT_LIST *psLinuxEventObjectList = (PVRSRV_LINUX_EVENT_OBJECT_LIST*)hOSEventObjectList; |
| struct list_head *psListEntry, *psListEntryTemp, *psList; |
| psList = &psLinuxEventObjectList->sList; |
| |
| read_lock_bh(&psLinuxEventObjectList->sLock); |
| list_for_each_safe(psListEntry, psListEntryTemp, psList) |
| { |
| |
| psLinuxEventObject = (PVRSRV_LINUX_EVENT_OBJECT *)list_entry(psListEntry, PVRSRV_LINUX_EVENT_OBJECT, sList); |
| |
| atomic_inc(&psLinuxEventObject->sTimeStamp); |
| wake_up_interruptible(&psLinuxEventObject->sWait); |
| } |
| read_unlock_bh(&psLinuxEventObjectList->sLock); |
| |
| return PVRSRV_OK; |
| |
| } |
| |
| /*! |
| ****************************************************************************** |
| |
| @Function LinuxEventObjectWait |
| |
| @Description |
| |
| Linux wait object routine |
| |
| @Input hOSEventObject : Event object handle |
| |
| @Input ui64Timeoutus : Time out value in usec |
| |
| @Return PVRSRV_ERROR : Error code |
| |
| ******************************************************************************/ |
| PVRSRV_ERROR LinuxEventObjectWait(IMG_HANDLE hOSEventObject, IMG_UINT64 ui64Timeoutus, IMG_BOOL bHoldBridgeLock) |
| { |
| IMG_UINT32 ui32TimeStamp; |
| IMG_BOOL bReleasePVRLock; |
| PVRSRV_DATA *psPVRSRVData = PVRSRVGetPVRSRVData(); |
| IMG_UINT32 ui32Remainder; |
| long timeOutJiffies; |
| DEFINE_WAIT(sWait); |
| |
| PVRSRV_LINUX_EVENT_OBJECT *psLinuxEventObject = (PVRSRV_LINUX_EVENT_OBJECT *) hOSEventObject; |
| |
| /* Check if the driver is good shape */ |
| if (psPVRSRVData->eServicesState != PVRSRV_SERVICES_STATE_OK) |
| { |
| return PVRSRV_ERROR_TIMEOUT; |
| } |
| |
| /* usecs_to_jiffies only takes an uint. So if our timeout is bigger than an |
| * uint use the msec version. With such a long timeout we really don't need |
| * the high resolution of usecs. */ |
| if (ui64Timeoutus > 0xffffffffULL) |
| timeOutJiffies = msecs_to_jiffies(OSDivide64(ui64Timeoutus, 1000, &ui32Remainder)); |
| else |
| timeOutJiffies = usecs_to_jiffies(ui64Timeoutus); |
| |
| do |
| { |
| prepare_to_wait(&psLinuxEventObject->sWait, &sWait, TASK_INTERRUPTIBLE); |
| ui32TimeStamp = (IMG_UINT32)atomic_read(&psLinuxEventObject->sTimeStamp); |
| |
| if(psLinuxEventObject->ui32TimeStampPrevious != ui32TimeStamp) |
| { |
| break; |
| } |
| |
| /* Check thread holds the current PVR/bridge lock before obeying the |
| * 'release before deschedule' behaviour. Some threads choose not to |
| * hold the bridge lock in their implementation. |
| */ |
| bReleasePVRLock = (!bHoldBridgeLock && BridgeLockIsLocked() && current == BridgeLockGetOwner()); |
| if (bReleasePVRLock == IMG_TRUE) |
| { |
| OSReleaseBridgeLock(); |
| } |
| |
| timeOutJiffies = schedule_timeout(timeOutJiffies); |
| |
| if (bReleasePVRLock == IMG_TRUE) |
| { |
| OSAcquireBridgeLock(); |
| } |
| |
| #if defined(DEBUG) |
| psLinuxEventObject->ui32Stats++; |
| #endif |
| |
| |
| } while (timeOutJiffies); |
| |
| finish_wait(&psLinuxEventObject->sWait, &sWait); |
| |
| psLinuxEventObject->ui32TimeStampPrevious = ui32TimeStamp; |
| |
| return timeOutJiffies ? PVRSRV_OK : PVRSRV_ERROR_TIMEOUT; |
| |
| } |