| /*************************************************************************/ /*! |
| @File |
| @Title Device Memory Management |
| @Copyright Copyright (c) Imagination Technologies Ltd. All Rights Reserved |
| @Description OS abstraction for the mmap2 interface for mapping PMRs into |
| User Mode memory |
| @License MIT |
| |
| 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. |
| |
| 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. |
| */ /**************************************************************************/ |
| |
| /* our exported API */ |
| #include "osmmap.h" |
| |
| /* include/ */ |
| #include "img_types.h" |
| #include "pvr_debug.h" |
| #include "pvrsrv_error.h" |
| |
| /* services/include/ */ |
| |
| /* services/include/srvhelper/ */ |
| #include "ra.h" |
| |
| #include "pmr.h" |
| |
| PVRSRV_ERROR |
| OSMMapPMR(IMG_HANDLE hBridge, |
| IMG_HANDLE hPMR, |
| IMG_DEVMEM_SIZE_T uiPMRSize, |
| IMG_UINT32 uiFlags, |
| IMG_HANDLE *phOSMMapPrivDataOut, |
| void **ppvMappingAddressOut, |
| size_t *puiMappingLengthOut) |
| { |
| PVRSRV_ERROR eError; |
| PMR *psPMR; |
| void *pvKernelAddress; |
| size_t uiLength; |
| IMG_HANDLE hPriv; |
| |
| PVR_UNREFERENCED_PARAMETER(hBridge); |
| PVR_UNREFERENCED_PARAMETER(uiFlags); |
| |
| /* |
| Normally this function would mmap a PMR into the memory space of |
| user process, but in this case we're taking a PMR and mapping it |
| into kernel virtual space. We keep the same function name for |
| symmetry as this allows the higher layers of the software stack |
| to not care whether they are user mode or kernel |
| */ |
| |
| psPMR = hPMR; |
| |
| eError = PMRAcquireKernelMappingData(psPMR, 0, 0, &pvKernelAddress, &uiLength, &hPriv); |
| if (eError != PVRSRV_OK) |
| { |
| goto e0; |
| } |
| |
| *phOSMMapPrivDataOut = hPriv; |
| *ppvMappingAddressOut = pvKernelAddress; |
| *puiMappingLengthOut = uiLength; |
| |
| /* MappingLength might be rounded up to page size */ |
| PVR_ASSERT(*puiMappingLengthOut >= uiPMRSize); |
| |
| return PVRSRV_OK; |
| |
| /* |
| error exit paths follow |
| */ |
| |
| e0: |
| PVR_ASSERT(eError != PVRSRV_OK); |
| return eError; |
| } |
| |
| void |
| OSMUnmapPMR(IMG_HANDLE hBridge, IMG_HANDLE hPMR, IMG_HANDLE hOSMMapPrivData, void *pvMappingAddress, size_t uiMappingLength) |
| { |
| PMR *psPMR; |
| |
| PVR_UNREFERENCED_PARAMETER(hBridge); |
| PVR_UNREFERENCED_PARAMETER(pvMappingAddress); |
| PVR_UNREFERENCED_PARAMETER(uiMappingLength); |
| |
| psPMR = hPMR; |
| PMRReleaseKernelMappingData(psPMR, hOSMMapPrivData); |
| } |