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 "dev/drm/drmP.h" 29 #include "dev/drm/drm.h" 30 31 int drm_mmap(struct dev_mmap_args *ap) 32 { 33 struct cdev *kdev = ap->a_head.a_dev; 34 vm_offset_t offset = ap->a_offset; 35 struct drm_device *dev = drm_get_device_from_kdev(kdev); 36 struct drm_file *file_priv = NULL; 37 drm_local_map_t *map; 38 enum drm_map_type type; 39 vm_paddr_t phys; 40 41 DRM_LOCK(); 42 file_priv = drm_find_file_by_proc(dev, DRM_CURPROC); 43 DRM_UNLOCK(); 44 45 if (file_priv == NULL) { 46 DRM_ERROR("can't find authenticator\n"); 47 return EINVAL; 48 } 49 50 if (!file_priv->authenticated) 51 return EACCES; 52 53 if (dev->dma && offset < ptoa(dev->dma->page_count)) { 54 drm_device_dma_t *dma = dev->dma; 55 56 DRM_SPINLOCK(&dev->dma_lock); 57 58 if (dma->pagelist != NULL) { 59 unsigned long page = offset >> PAGE_SHIFT; 60 unsigned long phys = dma->pagelist[page]; 61 ap->a_result = atop(phys); 62 DRM_SPINUNLOCK(&dev->dma_lock); 63 return 0; 64 } else { 65 DRM_SPINUNLOCK(&dev->dma_lock); 66 return -1; 67 } 68 } 69 70 /* A sequential search of a linked list is 71 fine here because: 1) there will only be 72 about 5-10 entries in the list and, 2) a 73 DRI client only has to do this mapping 74 once, so it doesn't have to be optimized 75 for performance, even if the list was a 76 bit longer. */ 77 DRM_LOCK(); 78 TAILQ_FOREACH(map, &dev->maplist, link) { 79 if (offset >= map->offset && offset < map->offset + map->size) 80 break; 81 } 82 83 if (map == NULL) { 84 DRM_DEBUG("Can't find map, requested offset = %016lx\n", 85 (unsigned long)offset); 86 TAILQ_FOREACH(map, &dev->maplist, link) { 87 DRM_DEBUG("map offset = %016lx, handle = %016lx\n", 88 (unsigned long)map->offset, 89 (unsigned long)map->handle); 90 } 91 DRM_UNLOCK(); 92 return -1; 93 } 94 if (((map->flags&_DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) { 95 DRM_UNLOCK(); 96 DRM_DEBUG("restricted map\n"); 97 return -1; 98 } 99 type = map->type; 100 DRM_UNLOCK(); 101 102 switch (type) { 103 case _DRM_FRAME_BUFFER: 104 case _DRM_REGISTERS: 105 case _DRM_AGP: 106 phys = offset; 107 break; 108 case _DRM_CONSISTENT: 109 phys = vtophys((char *)map->handle + (offset - map->offset)); 110 break; 111 case _DRM_SCATTER_GATHER: 112 case _DRM_SHM: 113 phys = vtophys(offset); 114 break; 115 default: 116 DRM_ERROR("bad map type %d\n", type); 117 return -1; /* This should never happen. */ 118 } 119 120 ap->a_result = atop(phys); 121 return 0; 122 } 123 124