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
34int 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