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("$FreeBSD$");
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
drm_mmap(struct cdev * kdev,vm_ooffset_t offset,vm_paddr_t * paddr,int prot,vm_memattr_t * memattr)34 int 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 successful 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