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/drm2/drmP.h>
32#include <dev/drm2/drm.h>
33
34int
35drm_mmap(struct cdev *kdev, vm_ooffset_t offset, vm_paddr_t *paddr,
36    int prot, vm_memattr_t *memattr)
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	vm_paddr_t phys;
43	int error;
44
45	/* d_mmap gets called twice, we can only reference file_priv during
46	 * the first call.  We need to assume that if error is EBADF the
47	 * call was succesful and the client is authenticated.
48	 */
49	error = devfs_get_cdevpriv((void **)&file_priv);
50	if (error == ENOENT) {
51		DRM_ERROR("Could not find authenticator!\n");
52		return EINVAL;
53	}
54
55	if (file_priv && !file_priv->authenticated)
56		return EACCES;
57
58	DRM_DEBUG("called with offset %016jx\n", offset);
59	if (dev->dma && offset < ptoa(dev->dma->page_count)) {
60		drm_device_dma_t *dma = dev->dma;
61
62		DRM_SPINLOCK(&dev->dma_lock);
63
64		if (dma->pagelist != NULL) {
65			unsigned long page = offset >> PAGE_SHIFT;
66			unsigned long phys = dma->pagelist[page];
67
68			DRM_SPINUNLOCK(&dev->dma_lock);
69			*paddr = phys;
70			return 0;
71		} else {
72			DRM_SPINUNLOCK(&dev->dma_lock);
73			return -1;
74		}
75	}
76
77	/* A sequential search of a linked list is
78	   fine here because: 1) there will only be
79	   about 5-10 entries in the list and, 2) a
80	   DRI client only has to do this mapping
81	   once, so it doesn't have to be optimized
82	   for performance, even if the list was a
83	   bit longer.
84	*/
85	DRM_LOCK(dev);
86	TAILQ_FOREACH(map, &dev->maplist, link) {
87		if (offset >> DRM_MAP_HANDLE_SHIFT ==
88		    (unsigned long)map->handle >> DRM_MAP_HANDLE_SHIFT)
89			break;
90	}
91
92	if (map == NULL) {
93		DRM_DEBUG("Can't find map, request offset = %016jx\n", offset);
94		TAILQ_FOREACH(map, &dev->maplist, link) {
95			DRM_DEBUG("map offset = %016lx, handle = %016lx\n",
96			    map->offset, (unsigned long)map->handle);
97		}
98		DRM_UNLOCK(dev);
99		return -1;
100	}
101	if (((map->flags & _DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) {
102		DRM_UNLOCK(dev);
103		DRM_DEBUG("restricted map\n");
104		return -1;
105	}
106	type = map->type;
107	DRM_UNLOCK(dev);
108
109	offset = offset & ((1ULL << DRM_MAP_HANDLE_SHIFT) - 1);
110
111	switch (type) {
112	case _DRM_FRAME_BUFFER:
113	case _DRM_AGP:
114		*memattr = VM_MEMATTR_WRITE_COMBINING;
115		/* FALLTHROUGH */
116	case _DRM_REGISTERS:
117		phys = map->offset + offset;
118		break;
119	case _DRM_SCATTER_GATHER:
120		*memattr = VM_MEMATTR_WRITE_COMBINING;
121		/* FALLTHROUGH */
122	case _DRM_CONSISTENT:
123	case _DRM_SHM:
124		phys = vtophys((char *)map->virtual + offset);
125		break;
126	default:
127		DRM_ERROR("bad map type %d\n", type);
128		return -1;	/* This should never happen. */
129	}
130
131	*paddr = phys;
132	return 0;
133}
134
135