drm_vm.c revision 152909 
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: head/sys/dev/drm/drm_vm.c 152909 2005-11-28 23:13:57Z anholt $");
26
27#include "dev/drm/drmP.h"
28#include "dev/drm/drm.h"
29
30#if defined(__FreeBSD__) && __FreeBSD_version >= 500102
31int drm_mmap(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr,
32    int prot)
33#elif defined(__FreeBSD__)
34int drm_mmap(dev_t kdev, vm_offset_t offset, int prot)
35#elif defined(__NetBSD__) || defined(__OpenBSD__)
36paddr_t drm_mmap(dev_t kdev, off_t offset, int prot)
37#endif
38{
39	DRM_DEVICE;
40	drm_local_map_t *map;
41	drm_file_t *priv;
42	drm_map_type_t type;
43#ifdef __FreeBSD__
44	vm_paddr_t phys;
45#else
46	paddr_t phys;
47#endif
48
49	DRM_LOCK();
50	priv = drm_find_file_by_proc(dev, DRM_CURPROC);
51	DRM_UNLOCK();
52	if (priv == NULL) {
53		DRM_ERROR("can't find authenticator\n");
54		return EINVAL;
55	}
56
57	if (!priv->authenticated)
58		return DRM_ERR(EACCES);
59
60	if (dev->dma && offset >= 0 && offset < ptoa(dev->dma->page_count)) {
61		drm_device_dma_t *dma = dev->dma;
62
63		DRM_SPINLOCK(&dev->dma_lock);
64
65		if (dma->pagelist != NULL) {
66			unsigned long page = offset >> PAGE_SHIFT;
67			unsigned long phys = dma->pagelist[page];
68
69#if defined(__FreeBSD__) && __FreeBSD_version >= 500102
70			*paddr = phys;
71			DRM_SPINUNLOCK(&dev->dma_lock);
72			return 0;
73#else
74			return atop(phys);
75#endif
76		} else {
77			DRM_SPINUNLOCK(&dev->dma_lock);
78			return -1;
79		}
80		DRM_SPINUNLOCK(&dev->dma_lock);
81	}
82
83				/* A sequential search of a linked list is
84				   fine here because: 1) there will only be
85				   about 5-10 entries in the list and, 2) a
86				   DRI client only has to do this mapping
87				   once, so it doesn't have to be optimized
88				   for performance, even if the list was a
89				   bit longer. */
90	DRM_LOCK();
91	TAILQ_FOREACH(map, &dev->maplist, link) {
92		if (offset >= map->offset && offset < map->offset + map->size)
93			break;
94	}
95
96	if (map == NULL) {
97		DRM_UNLOCK();
98		DRM_DEBUG("can't find map\n");
99		return -1;
100	}
101	if (((map->flags&_DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) {
102		DRM_UNLOCK();
103		DRM_DEBUG("restricted map\n");
104		return -1;
105	}
106	type = map->type;
107	DRM_UNLOCK();
108
109	switch (type) {
110	case _DRM_FRAME_BUFFER:
111	case _DRM_REGISTERS:
112	case _DRM_AGP:
113		phys = offset;
114		break;
115	case _DRM_CONSISTENT:
116		phys = vtophys((char *)map->handle + (offset - map->offset));
117		break;
118	case _DRM_SCATTER_GATHER:
119	case _DRM_SHM:
120		phys = vtophys(offset);
121		break;
122	default:
123		DRM_ERROR("bad map type %d\n", type);
124		return -1;	/* This should never happen. */
125	}
126
127#if defined(__FreeBSD__) && __FreeBSD_version >= 500102
128	*paddr = phys;
129	return 0;
130#else
131	return atop(phys);
132#endif
133}
134
135