1 /** 2 * \file drm_vm.c 3 * Memory mapping for DRM 4 * 5 * \author Rickard E. (Rik) Faith <faith@valinux.com> 6 * \author Gareth Hughes <gareth@valinux.com> 7 */ 8 9 /* 10 * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com 11 * 12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 14 * All Rights Reserved. 15 * 16 * Permission is hereby granted, free of charge, to any person obtaining a 17 * copy of this software and associated documentation files (the "Software"), 18 * to deal in the Software without restriction, including without limitation 19 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 20 * and/or sell copies of the Software, and to permit persons to whom the 21 * Software is furnished to do so, subject to the following conditions: 22 * 23 * The above copyright notice and this permission notice (including the next 24 * paragraph) shall be included in all copies or substantial portions of the 25 * Software. 26 * 27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 33 * OTHER DEALINGS IN THE SOFTWARE. 34 */ 35 36 #include <sys/cdefs.h> 37 /** @file drm_vm.c 38 * Support code for mmaping of DRM maps. 39 */ 40 41 #include <dev/drm2/drmP.h> 42 #include <dev/drm2/drm.h> 43 44 #ifdef FREEBSD_NOTYET 45 int 46 drm_mmap(struct cdev *kdev, vm_ooffset_t offset, vm_paddr_t *paddr, 47 int prot, vm_memattr_t *memattr) 48 { 49 struct drm_device *dev = drm_get_device_from_kdev(kdev); 50 struct drm_file *file_priv = NULL; 51 drm_local_map_t *map; 52 enum drm_map_type type; 53 vm_paddr_t phys; 54 int error; 55 56 /* d_mmap gets called twice, we can only reference file_priv during 57 * the first call. We need to assume that if error is EBADF the 58 * call was successful and the client is authenticated. 59 */ 60 error = devfs_get_cdevpriv((void **)&file_priv); 61 if (error == ENOENT) { 62 DRM_ERROR("Could not find authenticator!\n"); 63 return EINVAL; 64 } 65 66 if (file_priv && !file_priv->authenticated) 67 return EACCES; 68 69 DRM_DEBUG("called with offset %016jx\n", offset); 70 if (dev->dma && offset < ptoa(dev->dma->page_count)) { 71 drm_device_dma_t *dma = dev->dma; 72 73 DRM_SPINLOCK(&dev->dma_lock); 74 75 if (dma->pagelist != NULL) { 76 unsigned long page = offset >> PAGE_SHIFT; 77 unsigned long phys = dma->pagelist[page]; 78 79 DRM_SPINUNLOCK(&dev->dma_lock); 80 *paddr = phys; 81 return 0; 82 } else { 83 DRM_SPINUNLOCK(&dev->dma_lock); 84 return -1; 85 } 86 } 87 88 /* A sequential search of a linked list is 89 fine here because: 1) there will only be 90 about 5-10 entries in the list and, 2) a 91 DRI client only has to do this mapping 92 once, so it doesn't have to be optimized 93 for performance, even if the list was a 94 bit longer. 95 */ 96 DRM_LOCK(dev); 97 TAILQ_FOREACH(map, &dev->maplist, link) { 98 if (offset >> DRM_MAP_HANDLE_SHIFT == 99 (unsigned long)map->handle >> DRM_MAP_HANDLE_SHIFT) 100 break; 101 } 102 103 if (map == NULL) { 104 DRM_DEBUG("Can't find map, request offset = %016jx\n", offset); 105 TAILQ_FOREACH(map, &dev->maplist, link) { 106 DRM_DEBUG("map offset = %016lx, handle = %016lx\n", 107 map->offset, (unsigned long)map->handle); 108 } 109 DRM_UNLOCK(dev); 110 return -1; 111 } 112 if (((map->flags & _DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) { 113 DRM_UNLOCK(dev); 114 DRM_DEBUG("restricted map\n"); 115 return -1; 116 } 117 type = map->type; 118 DRM_UNLOCK(dev); 119 120 offset = offset & ((1ULL << DRM_MAP_HANDLE_SHIFT) - 1); 121 122 switch (type) { 123 case _DRM_FRAME_BUFFER: 124 case _DRM_AGP: 125 *memattr = VM_MEMATTR_WRITE_COMBINING; 126 /* FALLTHROUGH */ 127 case _DRM_REGISTERS: 128 phys = map->offset + offset; 129 break; 130 case _DRM_SCATTER_GATHER: 131 *memattr = VM_MEMATTR_WRITE_COMBINING; 132 /* FALLTHROUGH */ 133 case _DRM_CONSISTENT: 134 case _DRM_SHM: 135 phys = vtophys((char *)map->virtual + offset); 136 break; 137 default: 138 DRM_ERROR("bad map type %d\n", type); 139 return -1; /* This should never happen. */ 140 } 141 142 *paddr = phys; 143 return 0; 144 } 145 #endif /* FREEBSD_NOTYET */ 146