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 __FBSDID("$FreeBSD$"); 38 39 /** @file drm_vm.c 40 * Support code for mmaping of DRM maps. 41 */ 42 43 #include <dev/drm2/drmP.h> 44 #include <dev/drm2/drm.h> 45 46 #ifdef FREEBSD_NOTYET 47 int 48 drm_mmap(struct cdev *kdev, vm_ooffset_t offset, vm_paddr_t *paddr, 49 int prot, vm_memattr_t *memattr) 50 { 51 struct drm_device *dev = drm_get_device_from_kdev(kdev); 52 struct drm_file *file_priv = NULL; 53 drm_local_map_t *map; 54 enum drm_map_type type; 55 vm_paddr_t phys; 56 int error; 57 58 /* d_mmap gets called twice, we can only reference file_priv during 59 * the first call. We need to assume that if error is EBADF the 60 * call was succesful and the client is authenticated. 61 */ 62 error = devfs_get_cdevpriv((void **)&file_priv); 63 if (error == ENOENT) { 64 DRM_ERROR("Could not find authenticator!\n"); 65 return EINVAL; 66 } 67 68 if (file_priv && !file_priv->authenticated) 69 return EACCES; 70 71 DRM_DEBUG("called with offset %016jx\n", offset); 72 if (dev->dma && offset < ptoa(dev->dma->page_count)) { 73 drm_device_dma_t *dma = dev->dma; 74 75 DRM_SPINLOCK(&dev->dma_lock); 76 77 if (dma->pagelist != NULL) { 78 unsigned long page = offset >> PAGE_SHIFT; 79 unsigned long phys = dma->pagelist[page]; 80 81 DRM_SPINUNLOCK(&dev->dma_lock); 82 *paddr = phys; 83 return 0; 84 } else { 85 DRM_SPINUNLOCK(&dev->dma_lock); 86 return -1; 87 } 88 } 89 90 /* A sequential search of a linked list is 91 fine here because: 1) there will only be 92 about 5-10 entries in the list and, 2) a 93 DRI client only has to do this mapping 94 once, so it doesn't have to be optimized 95 for performance, even if the list was a 96 bit longer. 97 */ 98 DRM_LOCK(dev); 99 TAILQ_FOREACH(map, &dev->maplist, link) { 100 if (offset >> DRM_MAP_HANDLE_SHIFT == 101 (unsigned long)map->handle >> DRM_MAP_HANDLE_SHIFT) 102 break; 103 } 104 105 if (map == NULL) { 106 DRM_DEBUG("Can't find map, request offset = %016jx\n", offset); 107 TAILQ_FOREACH(map, &dev->maplist, link) { 108 DRM_DEBUG("map offset = %016lx, handle = %016lx\n", 109 map->offset, (unsigned long)map->handle); 110 } 111 DRM_UNLOCK(dev); 112 return -1; 113 } 114 if (((map->flags & _DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) { 115 DRM_UNLOCK(dev); 116 DRM_DEBUG("restricted map\n"); 117 return -1; 118 } 119 type = map->type; 120 DRM_UNLOCK(dev); 121 122 offset = offset & ((1ULL << DRM_MAP_HANDLE_SHIFT) - 1); 123 124 switch (type) { 125 case _DRM_FRAME_BUFFER: 126 case _DRM_AGP: 127 *memattr = VM_MEMATTR_WRITE_COMBINING; 128 /* FALLTHROUGH */ 129 case _DRM_REGISTERS: 130 phys = map->offset + offset; 131 break; 132 case _DRM_SCATTER_GATHER: 133 *memattr = VM_MEMATTR_WRITE_COMBINING; 134 /* FALLTHROUGH */ 135 case _DRM_CONSISTENT: 136 case _DRM_SHM: 137 phys = vtophys((char *)map->virtual + offset); 138 break; 139 default: 140 DRM_ERROR("bad map type %d\n", type); 141 return -1; /* This should never happen. */ 142 } 143 144 *paddr = phys; 145 return 0; 146 } 147 #endif /* FREEBSD_NOTYET */ 148