sys/external/bsd/drm/dist/bsd-core/drm_vm.c

   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  * ERIC ANHOLT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  20  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /** @file drm_vm.c
  25  * Support code for mmaping of DRM maps.
  26  */
  27
  28 #include "drmP.h"
  29 #include "drm.h"
  30
  31 #if defined(__FreeBSD__)
  32 int drm_mmap(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr,
  33     int prot)
  34 #elif   defined(__NetBSD__)
  35 paddr_t drm_mmap(dev_t kdev, off_t offset, int prot)
  36 #endif
  37 {
  38         struct drm_device *dev = drm_get_device_from_kdev(kdev);
  39         struct drm_file *file_priv = NULL;
  40         drm_local_map_t *map;
  41         enum drm_map_type type;
  42 #if defined(__FreeBSD__)
  43         vm_paddr_t phys;
  44         int error;
  45 #elif   defined(__NetBSD__)
  46         paddr_t phys;
  47         unsigned long map_offs;
  48 #endif
  49
  50 #if defined(__FreeBSD__)
  51         /* d_mmap gets called twice, we can only reference file_priv during
  52          * the first call.  We need to assume that if error is EBADF the
  53          * call was succesful and the client is authenticated.
  54          */
  55         error = devfs_get_cdevpriv((void **)&file_priv);
  56         if (error == ENOENT) {
  57                 DRM_ERROR("Could not find authenticator!\n");
  58                 return EINVAL;
  59         }
  60 #elif   defined(__NetBSD__)
  61         DRM_LOCK();
  62         file_priv = drm_find_file_by_proc(dev, DRM_CURPROC);
  63         DRM_UNLOCK();
  64         if (file_priv == NULL) {
  65                 DRM_ERROR("Could not find authenticator!\n");
  66                 return -1;
  67         }
  68 #endif
  69
  70         if (file_priv && !file_priv->authenticated)
  71 #if defined(__NetBSD__)
  72                 return -1;
  73 #else
  74                 return EACCES;
  75 #endif
  76
  77         if (dev->dma && offset >= 0 && offset < ptoa(dev->dma->page_count)) {
  78                 drm_device_dma_t *dma = dev->dma;
  79
  80                 DRM_SPINLOCK(&dev->dma_lock);
  81
  82                 if (dma->pagelist != NULL) {
  83                         unsigned long page = offset >> PAGE_SHIFT;
  84                         unsigned long physaddr = dma->pagelist[page];
  85
  86                         DRM_SPINUNLOCK(&dev->dma_lock);
  87 #if defined(__FreeBSD__)
  88                         *paddr = physaddr;
  89                         return 0;
  90 #elif   defined(__NetBSD__)
  91                         return atop(physaddr);
  92 #endif
  93                 } else {
  94                         DRM_SPINUNLOCK(&dev->dma_lock);
  95                         return -1;
  96                 }
  97         }
  98
  99                                 /* A sequential search of a linked list is
 100                                    fine here because: 1) there will only be
 101                                    about 5-10 entries in the list and, 2) a
 102                                    DRI client only has to do this mapping
 103                                    once, so it doesn't have to be optimized
 104                                    for performance, even if the list was a
 105                                    bit longer. */
 106         DRM_LOCK();
 107         TAILQ_FOREACH(map, &dev->maplist, link) {
 108                 if (offset >= map->offset && offset < map->offset + map->size)
 109                         break;
 110         }
 111
 112         if (map == NULL) {
 113                 DRM_DEBUG("Can't find map, requested offset = %" PRIx64 "\n",
 114                     offset);
 115                 TAILQ_FOREACH(map, &dev->maplist, link) {
 116                         DRM_DEBUG("map offset = %016lx, handle = %016lx\n",
 117                         map->offset, (unsigned long)map->handle);
 118                 }
 119                 DRM_UNLOCK();
 120                 return -1;
 121         }
 122         if (((map->flags&_DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) {
 123                 DRM_UNLOCK();
 124                 DRM_DEBUG("restricted map\n");
 125                 return -1;
 126         }
 127         type = map->type;
 128 #if     defined(__NetBSD__)
 129         map_offs = map->offset;
 130 #endif
 131         DRM_UNLOCK();
 132
 133         switch (type) {
 134         case _DRM_FRAME_BUFFER:
 135         case _DRM_REGISTERS:
 136         case _DRM_AGP:
 137 #if     defined(__NetBSD__)
 138                 phys = bus_space_mmap(dev->pa.pa_memt, map->offset,
 139                                 offset - map->offset, prot, BUS_SPACE_MAP_LINEAR);
 140                 if (phys == -1) {
 141                         DRM_ERROR("bus_space_mmap for %" PRIx64 " failed\n", offset);
 142                         return -1;
 143                 }
 144                 return phys;
 145 #else
 146                 phys = offset;
 147 #endif
 148                 break;
 149         case _DRM_CONSISTENT:
 150                 phys = vtophys((vaddr_t)((char *)map->handle + (offset - map->offset)));
 151                 break;
 152         case _DRM_SCATTER_GATHER:
 153         case _DRM_SHM:
 154                 phys = vtophys(offset);
 155                 break;
 156         default:
 157                 DRM_ERROR("bad map type %d\n", type);
 158                 return -1;      /* This should never happen. */
 159         }
 160
 161 #if defined(__FreeBSD__)
 162         *paddr = phys;
 163         return 0;
 164 #elif   defined(__NetBSD__)
 165         return atop(phys);
 166 #endif
 167 }
 168