| /*************************************************************************/ /*! |
| @File info_page_km.c |
| @Title Kernel/User space shared memory |
| @Copyright Copyright (c) Imagination Technologies Ltd. All Rights Reserved |
| @Description Implements general purpose shared memory between kernel driver |
| and user mode. |
| @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 "info_page_defs.h" |
| #include "info_page.h" |
| #include "pvrsrv.h" |
| #include "devicemem.h" |
| #include "pmr.h" |
| |
| PVRSRV_ERROR InfoPageCreate(PVRSRV_DATA *psData) |
| { |
| const DEVMEM_FLAGS_T uiMemFlags = PVRSRV_MEMALLOCFLAG_CPU_READABLE | |
| PVRSRV_MEMALLOCFLAG_CPU_WRITEABLE | |
| PVRSRV_MEMALLOCFLAG_ZERO_ON_ALLOC | |
| PVRSRV_MEMALLOCFLAG_CPU_CACHE_INCOHERENT | |
| PVRSRV_MEMALLOCFLAG_KERNEL_CPU_MAPPABLE | |
| PVRSRV_MEMALLOCFLAG_CPU_LOCAL; |
| PVRSRV_ERROR eError; |
| |
| PVR_ASSERT(psData != NULL); |
| |
| /* Allocate single page of memory for driver information page */ |
| eError = DevmemAllocateExportable(psData->psHostMemDeviceNode, |
| OSGetPageSize(), |
| OSGetPageSize(), |
| OSGetPageShift(), |
| uiMemFlags, |
| "PVRSRVInfoPage", |
| &psData->psInfoPageMemDesc); |
| PVR_LOGG_IF_ERROR(eError, "DevmemAllocateExportable", e0); |
| |
| eError = DevmemAcquireCpuVirtAddr(psData->psInfoPageMemDesc, |
| (void **) &psData->pui32InfoPage); |
| PVR_LOGG_IF_ERROR(eError, "DevmemAllocateExportable", e0); |
| |
| /* Look-up the memory descriptor PMR handle */ |
| eError = DevmemLocalGetImportHandle(psData->psInfoPageMemDesc, |
| (void **) &psData->psInfoPagePMR); |
| PVR_LOGG_IF_ERROR(eError, "DevmemLocalGetImportHandle", e0); |
| |
| eError = OSLockCreate(&psData->hInfoPageLock); |
| PVR_LOGG_IF_ERROR(eError, "OSLockCreate", e0); |
| |
| return PVRSRV_OK; |
| |
| e0: |
| InfoPageDestroy(psData); |
| return eError; |
| } |
| |
| void InfoPageDestroy(PVRSRV_DATA *psData) |
| { |
| if (psData->psInfoPageMemDesc) |
| { |
| if (psData->pui32InfoPage != NULL) |
| { |
| DevmemReleaseCpuVirtAddr(psData->psInfoPageMemDesc); |
| psData->pui32InfoPage = NULL; |
| } |
| |
| DevmemFree(psData->psInfoPageMemDesc); |
| psData->psInfoPageMemDesc = NULL; |
| } |
| |
| if (psData->hInfoPageLock) |
| { |
| OSLockDestroy(psData->hInfoPageLock); |
| psData->hInfoPageLock = NULL; |
| } |
| } |
| |
| PVRSRV_ERROR PVRSRVAcquireInfoPageKM(PMR **ppsPMR) |
| { |
| PVRSRV_DATA *psData = PVRSRVGetPVRSRVData(); |
| |
| PVR_LOGR_IF_FALSE(psData->psInfoPageMemDesc != NULL, "invalid MEMDESC" |
| " handle", PVRSRV_ERROR_INVALID_PARAMS); |
| PVR_LOGR_IF_FALSE(psData->psInfoPagePMR != NULL, "invalid PMR handle", |
| PVRSRV_ERROR_INVALID_PARAMS); |
| |
| /* Copy the PMR import handle back */ |
| *ppsPMR = psData->psInfoPagePMR; |
| |
| return PVRSRV_OK; |
| } |
| |
| PVRSRV_ERROR PVRSRVReleaseInfoPageKM(PMR *ppsPMR) |
| { |
| /* Nothing to do here as PMR is singleton */ |
| PVR_UNREFERENCED_PARAMETER(ppsPMR); |
| return PVRSRV_OK; |
| } |