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 /** @file drm_vm.c
25 * Support code for mmaping of DRM maps.
26 */
27
28 #include "drmP.h"
29 #include "drm.h"
30
31 #if defined(__FreeBSD__)
drm_mmap(struct cdev * kdev,vm_offset_t offset,vm_paddr_t * paddr,int prot)32 int drm_mmap(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr,
33 int prot)
34 #elif defined(__NetBSD__)
35 paddr_t drm_mmap(dev_t kdev, off_t offset, int prot)
36 #endif
37 {
38 struct drm_device *dev = drm_get_device_from_kdev(kdev);
39 struct drm_file *file_priv = NULL;
40 drm_local_map_t *map;
41 enum drm_map_type type;
42 #if defined(__FreeBSD__)
43 vm_paddr_t phys;
44 int error;
45 #elif defined(__NetBSD__)
46 paddr_t phys;
47 int flags = 0;
48 #endif
49
50 #if defined(__FreeBSD__)
51 /* d_mmap gets called twice, we can only reference file_priv during
52 * the first call. We need to assume that if error is EBADF the
53 * call was succesful and the client is authenticated.
54 */
55 error = devfs_get_cdevpriv((void **)&file_priv);
56 if (error == ENOENT) {
57 DRM_ERROR("Could not find authenticator!\n");
58 return EINVAL;
59 }
60 #elif defined(__NetBSD__)
61 DRM_LOCK();
62 file_priv = drm_find_file_by_proc(dev, DRM_CURPROC);
63 DRM_UNLOCK();
64 if (file_priv == NULL) {
65 DRM_ERROR("Could not find authenticator!\n");
66 return -1;
67 }
68 #endif
69
70 if (file_priv && !file_priv->authenticated)
71 #if defined(__NetBSD__)
72 return -1;
73 #else
74 return EACCES;
75 #endif
76
77 if (dev->dma && offset >= 0 && offset < ptoa(dev->dma->page_count)) {
78 drm_device_dma_t *dma = dev->dma;
79
80 DRM_SPINLOCK(&dev->dma_lock);
81
82 if (dma->pagelist != NULL) {
83 unsigned long page = offset >> PAGE_SHIFT;
84 unsigned long physaddr = dma->pagelist[page];
85
86 DRM_SPINUNLOCK(&dev->dma_lock);
87 #if defined(__FreeBSD__)
88 *paddr = physaddr;
89 return 0;
90 #elif defined(__NetBSD__)
91 return atop(physaddr);
92 #endif
93 } else {
94 DRM_SPINUNLOCK(&dev->dma_lock);
95 return -1;
96 }
97 }
98
99 /* A sequential search of a linked list is
100 fine here because: 1) there will only be
101 about 5-10 entries in the list and, 2) a
102 DRI client only has to do this mapping
103 once, so it doesn't have to be optimized
104 for performance, even if the list was a
105 bit longer. */
106 DRM_LOCK();
107 TAILQ_FOREACH(map, &dev->maplist, link) {
108 if (offset >= map->offset && offset < map->offset + map->size)
109 break;
110 }
111
112 if (map == NULL) {
113 DRM_DEBUG("Can't find map, requested offset = %" PRIx64 "\n",
114 offset);
115 TAILQ_FOREACH(map, &dev->maplist, link) {
116 DRM_DEBUG("map offset = %016lx, handle = %016lx\n",
117 map->offset, (unsigned long)map->handle);
118 }
119 DRM_UNLOCK();
120 return -1;
121 }
122 if (((map->flags&_DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) {
123 DRM_UNLOCK();
124 DRM_DEBUG("restricted map\n");
125 return -1;
126 }
127 type = map->type;
128 DRM_UNLOCK();
129
130 switch (type) {
131 case _DRM_FRAME_BUFFER:
132 case _DRM_REGISTERS:
133 case _DRM_AGP:
134 #if defined(__NetBSD__)
135 flags = BUS_SPACE_MAP_LINEAR;
136 if (type == _DRM_FRAME_BUFFER || type == _DRM_AGP)
137 flags |= BUS_SPACE_MAP_PREFETCHABLE;
138 phys = bus_space_mmap(dev->pa.pa_memt, map->offset,
139 offset - map->offset, prot, flags);
140 if (phys == -1) {
141 DRM_ERROR("bus_space_mmap for %" PRIx64 " failed\n", offset);
142 return -1;
143 }
144 return phys;
145 #else
146 phys = offset;
147 #endif
148 break;
149 case _DRM_CONSISTENT:
150 phys = vtophys((vaddr_t)((char *)map->handle + (offset - map->offset)));
151 break;
152 case _DRM_SCATTER_GATHER:
153 case _DRM_SHM:
154 phys = vtophys(offset);
155 break;
156 default:
157 DRM_ERROR("bad map type %d\n", type);
158 return -1; /* This should never happen. */
159 }
160
161 #if defined(__FreeBSD__)
162 *paddr = phys;
163 return 0;
164 #elif defined(__NetBSD__)
165 return atop(phys);
166 #endif
167 }
168
169