drivers/gpu/drm/img-rogue/osmmap.h

/*************************************************************************/ /*!
@File
@Title          OS Interface for mapping PMRs into CPU space.
@Copyright      Copyright (c) Imagination Technologies Ltd. All Rights Reserved
@Description    OS abstraction for the mmap2 interface for mapping PMRs into
                User Mode memory
@License        Dual MIT/GPLv2

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EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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*/ /**************************************************************************/

#ifndef _OSMMAP_H_
#define _OSMMAP_H_

#include <powervr/mem_types.h>

#include "img_types.h"
#include "pvrsrv_error.h"

/**************************************************************************/ /*!
@Function       OSMMapPMR
@Description    Maps the specified PMR into CPU memory so that it may be
                accessed by the user process.
                Whether the memory is mapped read only, read/write, or not at
                all, is dependent on the PMR itself.
                The PMR handle is opaque to the user, and lower levels of this
                stack ensure that the handle is private to this process, such that
                this API cannot be abused to gain access to other people's PMRs.
                The OS implementation of this function should return the virtual
                address and length for the User to use. The "PrivData" is to be
                stored opaquely by the caller (N.B. he should make no assumptions,
                in particular, NULL is a valid handle) and given back to the
                call to OSMUnmapPMR.
                The OS implementation is free to use the PrivData handle for any
                purpose it sees fit.
@Input          hBridge              The bridge handle.
@Input          hPMR                 The handle of the PMR to be mapped.
@Input          uiPMRLength          The size of the PMR.
@Input          uiFlags              Flags indicating how the mapping should
                                     be done (read-only, etc). These may not
                                     be honoured if the PMR does not permit
                                     them.
@Input          uiPMRLength          The size of the PMR.
@Output         phOSMMapPrivDataOut  Returned private data.
@Output         ppvMappingAddressOut The returned mapping.
@Output         puiMappingLengthOut  The size of the returned mapping.
@Return         PVRSRV_OK on success, failure code otherwise.
 */ /**************************************************************************/
extern PVRSRV_ERROR
OSMMapPMR(IMG_HANDLE hBridge,
          IMG_HANDLE hPMR,
          IMG_DEVMEM_SIZE_T uiPMRLength,
          IMG_UINT32 uiFlags,
          IMG_HANDLE *phOSMMapPrivDataOut,
          void **ppvMappingAddressOut,
          size_t *puiMappingLengthOut);

/**************************************************************************/ /*!
@Function       OSMUnmapPMR
@Description    Unmaps the specified PMR from CPU memory.
                This function is the counterpart to OSMMapPMR.
                The caller is required to pass the PMR handle back in along
                with the same 3-tuple of information that was returned by the
                call to OSMMapPMR in phOSMMapPrivDataOut.
                It is possible to unmap only part of the original mapping
                with this call, by specifying only the address range to be
                unmapped in pvMappingAddress and uiMappingLength.
@Input          hBridge              The bridge handle.
@Input          hPMR                 The handle of the PMR to be unmapped.
@Input          hOSMMapPrivData      The OS private data of the mapping.
@Input          pvMappingAddress     The address to be unmapped.
@Input          uiMappingLength      The size to be unmapped.
@Return         PVRSRV_OK on success, failure code otherwise.
 */ /**************************************************************************/
/*
   FIXME:
   perhaps this function should take _only_ the hOSMMapPrivData arg,
   and the implementation is required to store any of the other data
   items that it requires to do the unmap?
*/
extern void
OSMUnmapPMR(IMG_HANDLE hBridge,
            IMG_HANDLE hPMR,
            IMG_HANDLE hOSMMapPrivData,
            void *pvMappingAddress,
            size_t uiMappingLength);


#endif /* _OSMMAP_H_ */