drm_vm.c revision 145132
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 * $FreeBSD: head/sys/dev/drm/drm_vm.c 145132 2005-04-16 03:44:47Z anholt $ 24 */ 25 26#include "dev/drm/drmP.h" 27#include "dev/drm/drm.h" 28 29#if defined(__FreeBSD__) && __FreeBSD_version >= 500102 30int drm_mmap(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr, 31 int prot) 32#elif defined(__FreeBSD__) 33int drm_mmap(dev_t kdev, vm_offset_t offset, int prot) 34#elif defined(__NetBSD__) || defined(__OpenBSD__) 35paddr_t drm_mmap(dev_t kdev, off_t offset, int prot) 36#endif 37{ 38 DRM_DEVICE; 39 drm_local_map_t *map; 40 drm_file_t *priv; 41 drm_map_type_t type; 42 43 DRM_LOCK(); 44 priv = drm_find_file_by_proc(dev, DRM_CURPROC); 45 DRM_UNLOCK(); 46 if (priv == NULL) { 47 DRM_ERROR("can't find authenticator\n"); 48 return EINVAL; 49 } 50 51 if (!priv->authenticated) 52 return DRM_ERR(EACCES); 53 54 DRM_SPINLOCK(&dev->dma_lock); 55 if (dev->dma && offset >= 0 && offset < ptoa(dev->dma->page_count)) { 56 drm_device_dma_t *dma = dev->dma; 57 58 if (dma->pagelist != NULL) { 59 unsigned long page = offset >> PAGE_SHIFT; 60 unsigned long phys = dma->pagelist[page]; 61 62#if defined(__FreeBSD__) && __FreeBSD_version >= 500102 63 *paddr = phys; 64 DRM_SPINUNLOCK(&dev->dma_lock); 65 return 0; 66#else 67 return atop(phys); 68#endif 69 } else { 70 DRM_SPINUNLOCK(&dev->dma_lock); 71 return -1; 72 } 73 } 74 DRM_SPINUNLOCK(&dev->dma_lock); 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 DRM_LOCK(); 84 TAILQ_FOREACH(map, &dev->maplist, link) { 85 if (offset >= map->offset && offset < map->offset + map->size) 86 break; 87 } 88 89 if (map == NULL) { 90 DRM_UNLOCK(); 91 DRM_DEBUG("can't find map\n"); 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#if defined(__FreeBSD__) && __FreeBSD_version >= 500102 107 *paddr = offset; 108 return 0; 109#else 110 return atop(offset); 111#endif 112 case _DRM_SCATTER_GATHER: 113 case _DRM_SHM: 114#if defined(__FreeBSD__) && __FreeBSD_version >= 500102 115 *paddr = vtophys(offset); 116 return 0; 117#else 118 return atop(vtophys(offset)); 119#endif 120 default: 121 return -1; /* This should never happen. */ 122 } 123 DRM_DEBUG("bailing out\n"); 124 125 return -1; 126} 127 128