drm_vm.c revision 189916
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#include <sys/cdefs.h> 25__FBSDID("$FreeBSD: head/sys/dev/drm/drm_vm.c 189916 2009-03-17 05:10:12Z rnoland $"); 26 27/** @file drm_vm.c 28 * Support code for mmaping of DRM maps. 29 */ 30 31#include "dev/drm/drmP.h" 32#include "dev/drm/drm.h" 33 34int drm_mmap(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr, 35 int prot) 36{ 37 struct drm_device *dev = drm_get_device_from_kdev(kdev); 38 struct drm_file *file_priv = NULL; 39 drm_local_map_t *map; 40 enum drm_map_type type; 41 vm_paddr_t phys; 42 int error; 43 44 /* d_mmap gets called twice, we can only reference file_priv during 45 * the first call. We need to assume that if error is EBADF the 46 * call was succesful and the client is authenticated. 47 */ 48 error = devfs_get_cdevpriv((void **)&file_priv); 49 if (error == ENOENT) { 50 DRM_ERROR("Could not find authenticator!\n"); 51 return EINVAL; 52 } 53 54 if (file_priv && !file_priv->authenticated) 55 return EACCES; 56 57 if (dev->dma && offset >= 0 && offset < ptoa(dev->dma->page_count)) { 58 drm_device_dma_t *dma = dev->dma; 59 60 DRM_SPINLOCK(&dev->dma_lock); 61 62 if (dma->pagelist != NULL) { 63 unsigned long page = offset >> PAGE_SHIFT; 64 unsigned long phys = dma->pagelist[page]; 65 66 DRM_SPINUNLOCK(&dev->dma_lock); 67 *paddr = phys; 68 return 0; 69 } else { 70 DRM_SPINUNLOCK(&dev->dma_lock); 71 return -1; 72 } 73 } 74 75 /* A sequential search of a linked list is 76 fine here because: 1) there will only be 77 about 5-10 entries in the list and, 2) a 78 DRI client only has to do this mapping 79 once, so it doesn't have to be optimized 80 for performance, even if the list was a 81 bit longer. */ 82 DRM_LOCK(); 83 TAILQ_FOREACH(map, &dev->maplist, link) { 84 if (offset >= map->offset && offset < map->offset + map->size) 85 break; 86 } 87 88 if (map == NULL) { 89 DRM_DEBUG("Can't find map, requested offset = %016lx\n", 90 (unsigned long)offset); 91 TAILQ_FOREACH(map, &dev->maplist, link) { 92 DRM_DEBUG("map offset = %016lx, handle = %016lx\n", 93 (unsigned long)map->offset, 94 (unsigned long)map->handle); 95 } 96 DRM_UNLOCK(); 97 return -1; 98 } 99 if (((map->flags&_DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) { 100 DRM_UNLOCK(); 101 DRM_DEBUG("restricted map\n"); 102 return -1; 103 } 104 type = map->type; 105 DRM_UNLOCK(); 106 107 switch (type) { 108 case _DRM_FRAME_BUFFER: 109 case _DRM_REGISTERS: 110 case _DRM_AGP: 111 phys = offset; 112 break; 113 case _DRM_CONSISTENT: 114 phys = vtophys((char *)map->handle + (offset - map->offset)); 115 break; 116 case _DRM_SCATTER_GATHER: 117 case _DRM_SHM: 118 phys = vtophys(offset); 119 break; 120 default: 121 DRM_ERROR("bad map type %d\n", type); 122 return -1; /* This should never happen. */ 123 } 124 125 *paddr = phys; 126 return 0; 127} 128 129