drm_vm.h

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    1 /*-
    2  * Copyright 2003 Eric Anholt
    3  * All Rights Reserved.
    4  *
    5  * Permission is hereby granted, free of charge, to any person obtaining a
    6  * copy of this software and associated documentation files (the "Software"),
    7  * to deal in the Software without restriction, including without limitation
    8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
    9  * and/or sell copies of the Software, and to permit persons to whom the
   10  * Software is furnished to do so, subject to the following conditions:
   11  * 
   12  * The above copyright notice and this permission notice (including the next
   13  * paragraph) shall be included in all copies or substantial portions of the
   14  * Software.
   15  * 
   16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   19  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
   20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
   21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   22  * DEALINGS IN THE SOFTWARE.
   23  *
   24  *
   25  * $FreeBSD$
   26  */
   27 
   28 #if defined(__FreeBSD__) && __FreeBSD_version >= 500102
   29 static int DRM(dma_mmap)(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr, 
   30     int prot)
   31 #elif defined(__FreeBSD__)
   32 static int DRM(dma_mmap)(dev_t kdev, vm_offset_t offset, int prot)
   33 #elif defined(__NetBSD__)
   34 static paddr_t DRM(dma_mmap)(dev_t kdev, vm_offset_t offset, int prot)
   35 #endif
   36 {
   37         DRM_DEVICE;
   38         drm_device_dma_t *dma = dev->dma;
   39         unsigned long physical;
   40         unsigned long page;
   41 
   42         if (dma == NULL || dma->pagelist == NULL)
   43                 return -1;
   44 
   45         page     = offset >> PAGE_SHIFT;
   46         physical = dma->pagelist[page];
   47 
   48         DRM_DEBUG("0x%08lx (page %lu) => 0x%08lx\n", (long)offset, page, physical);
   49 #if defined(__FreeBSD__) && __FreeBSD_version >= 500102
   50         *paddr = physical;
   51         return 0;
   52 #else
   53         return atop(physical);
   54 #endif
   55 }
   56 
   57 #if defined(__FreeBSD__) && __FreeBSD_version >= 500102
   58 int DRM(mmap)(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr, 
   59     int prot)
   60 #elif defined(__FreeBSD__)
   61 int DRM(mmap)(dev_t kdev, vm_offset_t offset, int prot)
   62 #elif defined(__NetBSD__)
   63 paddr_t DRM(mmap)(dev_t kdev, off_t offset, int prot)
   64 #endif
   65 {
   66         DRM_DEVICE;
   67         drm_local_map_t *map = NULL;
   68         drm_map_list_entry_t *listentry = NULL;
   69         drm_file_t *priv;
   70 
   71         DRM_GET_PRIV_WITH_RETURN(priv, (DRMFILE)(uintptr_t)DRM_CURRENTPID);
   72 
   73         if (!priv->authenticated)
   74                 return DRM_ERR(EACCES);
   75 
   76         if (dev->dma
   77             && offset >= 0
   78             && offset < ptoa(dev->dma->page_count))
   79 #if defined(__FreeBSD__) && __FreeBSD_version >= 500102
   80                 return DRM(dma_mmap)(kdev, offset, paddr, prot);
   81 #else
   82                 return DRM(dma_mmap)(kdev, offset, prot);
   83 #endif
   84 
   85                                 /* A sequential search of a linked list is
   86                                    fine here because: 1) there will only be
   87                                    about 5-10 entries in the list and, 2) a
   88                                    DRI client only has to do this mapping
   89                                    once, so it doesn't have to be optimized
   90                                    for performance, even if the list was a
   91                                    bit longer. */
   92         TAILQ_FOREACH(listentry, dev->maplist, link) {
   93                 map = listentry->map;
   94 /*              DRM_DEBUG("considering 0x%x..0x%x\n", map->offset, map->offset + map->size - 1);*/
   95                 if (offset >= map->offset
   96                     && offset < map->offset + map->size) break;
   97         }
   98         
   99         if (!listentry) {
  100                 DRM_DEBUG("can't find map\n");
  101                 return -1;
  102         }
  103         if (((map->flags&_DRM_RESTRICTED) && DRM_SUSER(DRM_CURPROC))) {
  104                 DRM_DEBUG("restricted map\n");
  105                 return -1;
  106         }
  107 
  108         switch (map->type) {
  109         case _DRM_FRAME_BUFFER:
  110         case _DRM_REGISTERS:
  111         case _DRM_AGP:
  112 #if defined(__FreeBSD__) && __FreeBSD_version >= 500102
  113                 *paddr = offset;
  114                 return 0;
  115 #else
  116                 return atop(offset);
  117 #endif
  118         case _DRM_SCATTER_GATHER:
  119         case _DRM_SHM:
  120 #if defined(__FreeBSD__) && __FreeBSD_version >= 500102
  121                 *paddr = vtophys(offset);
  122                 return 0;
  123 #else
  124                 return atop(vtophys(offset));
  125 #endif
  126         default:
  127                 return -1;      /* This should never happen. */
  128         }
  129         DRM_DEBUG("bailing out\n");
  130         
  131         return -1;
  132 }
  133

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FreeBSD/Linux Kernel Cross Reference sys/dev/drm/drm_vm.h

FreeBSD/Linux Kernel Cross Reference
sys/dev/drm/drm_vm.h