drm_vm.c revision 256281
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: stable/10/sys/dev/drm/drm_vm.c 207066 2010-04-22 18:21:25Z 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_ooffset_t offset, vm_paddr_t *paddr, 35 int prot, vm_memattr_t *memattr) 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 DRM_DEBUG("called with offset %016jx\n", offset); 58 if (dev->dma && offset < ptoa(dev->dma->page_count)) { 59 drm_device_dma_t *dma = dev->dma; 60 61 DRM_SPINLOCK(&dev->dma_lock); 62 63 if (dma->pagelist != NULL) { 64 unsigned long page = offset >> PAGE_SHIFT; 65 unsigned long phys = dma->pagelist[page]; 66 67 DRM_SPINUNLOCK(&dev->dma_lock); 68 *paddr = phys; 69 return 0; 70 } else { 71 DRM_SPINUNLOCK(&dev->dma_lock); 72 return -1; 73 } 74 } 75 76 /* A sequential search of a linked list is 77 fine here because: 1) there will only be 78 about 5-10 entries in the list and, 2) a 79 DRI client only has to do this mapping 80 once, so it doesn't have to be optimized 81 for performance, even if the list was a 82 bit longer. 83 */ 84 DRM_LOCK(); 85 TAILQ_FOREACH(map, &dev->maplist, link) { 86 if (offset >> DRM_MAP_HANDLE_SHIFT == 87 (unsigned long)map->handle >> DRM_MAP_HANDLE_SHIFT) 88 break; 89 } 90 91 if (map == NULL) { 92 DRM_DEBUG("Can't find map, request offset = %016jx\n", offset); 93 TAILQ_FOREACH(map, &dev->maplist, link) { 94 DRM_DEBUG("map offset = %016lx, handle = %016lx\n", 95 map->offset, (unsigned long)map->handle); 96 } 97 DRM_UNLOCK(); 98 return -1; 99 } 100 if (((map->flags & _DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) { 101 DRM_UNLOCK(); 102 DRM_DEBUG("restricted map\n"); 103 return -1; 104 } 105 type = map->type; 106 DRM_UNLOCK(); 107 108 offset = offset & ((1ULL << DRM_MAP_HANDLE_SHIFT) - 1); 109 110 switch (type) { 111 case _DRM_FRAME_BUFFER: 112 case _DRM_AGP: 113 *memattr = VM_MEMATTR_WRITE_COMBINING; 114 /* FALLTHROUGH */ 115 case _DRM_REGISTERS: 116 phys = map->offset + offset; 117 break; 118 case _DRM_SCATTER_GATHER: 119 *memattr = VM_MEMATTR_WRITE_COMBINING; 120 /* FALLTHROUGH */ 121 case _DRM_CONSISTENT: 122 case _DRM_SHM: 123 phys = vtophys((char *)map->virtual + offset); 124 break; 125 default: 126 DRM_ERROR("bad map type %d\n", type); 127 return -1; /* This should never happen. */ 128 } 129 130 *paddr = phys; 131 return 0; 132} 133 134