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,

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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: head/sys/dev/drm/drm_vm.c 183573 2008-10-03 16:59:11Z rnoland $");
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
34int drm_mmap(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr,
35 int prot)
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 succesful 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 if (dev->dma && offset >= 0 && offset < ptoa(dev->dma->page_count)) {
58 drm_device_dma_t *dma = dev->dma;
59
60 DRM_SPINLOCK(&dev->dma_lock);
61
62 if (dma->pagelist != NULL) {
63 unsigned long page = offset >> PAGE_SHIFT;
64 unsigned long phys = dma->pagelist[page];
65
66 DRM_SPINUNLOCK(&dev->dma_lock);
67 *paddr = phys;
68 return 0;
69 } else {
70 DRM_SPINUNLOCK(&dev->dma_lock);
71 return -1;
72 }
73 }
74
75 /* A sequential search of a linked list is
76 fine here because: 1) there will only be

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111 case _DRM_SHM:
112 phys = vtophys(offset);
113 break;
114 default:
115 DRM_ERROR("bad map type %d\n", type);
116 return -1; /* This should never happen. */
117 }
118
119 *paddr = phys;
120 return 0;
121}
122