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/** @file drm_vm.c
25 * Support code for mmaping of DRM maps.
26 */
27
28#include "drmP.h"
29#include "drm.h"
30
31#if defined(__FreeBSD__)
32int drm_mmap(struct cdev *kdev, vm_offset_t offset, vm_paddr_t *paddr,
33    int prot)
34#elif   defined(__NetBSD__)
35paddr_t drm_mmap(dev_t kdev, off_t offset, int prot)
36#endif
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#if defined(__FreeBSD__)
43	vm_paddr_t phys;
44	int error;
45#elif   defined(__NetBSD__)
46	paddr_t phys;
47	unsigned long map_offs;
48	int flags = 0;
49#endif
50
51#if defined(__FreeBSD__)
52	/* d_mmap gets called twice, we can only reference file_priv during
53	 * the first call.  We need to assume that if error is EBADF the
54	 * call was succesful and the client is authenticated.
55	 */
56	error = devfs_get_cdevpriv((void **)&file_priv);
57	if (error == ENOENT) {
58		DRM_ERROR("Could not find authenticator!\n");
59		return EINVAL;
60	}
61#elif   defined(__NetBSD__)
62	DRM_LOCK();
63	file_priv = drm_find_file_by_proc(dev, DRM_CURPROC);
64	DRM_UNLOCK();
65	if (file_priv == NULL) {
66		DRM_ERROR("Could not find authenticator!\n");
67		return -1;
68	}
69#endif
70
71	if (file_priv && !file_priv->authenticated)
72#if defined(__NetBSD__)
73		return -1;
74#else
75		return EACCES;
76#endif
77
78	if (dev->dma && offset >= 0 && offset < ptoa(dev->dma->page_count)) {
79		drm_device_dma_t *dma = dev->dma;
80
81		DRM_SPINLOCK(&dev->dma_lock);
82
83		if (dma->pagelist != NULL) {
84			unsigned long page = offset >> PAGE_SHIFT;
85			unsigned long physaddr = dma->pagelist[page];
86
87			DRM_SPINUNLOCK(&dev->dma_lock);
88#if defined(__FreeBSD__)
89			*paddr = physaddr;
90			return 0;
91#elif   defined(__NetBSD__)
92			return atop(physaddr);
93#endif
94		} else {
95			DRM_SPINUNLOCK(&dev->dma_lock);
96			return -1;
97		}
98	}
99
100				/* A sequential search of a linked list is
101				   fine here because: 1) there will only be
102				   about 5-10 entries in the list and, 2) a
103				   DRI client only has to do this mapping
104				   once, so it doesn't have to be optimized
105				   for performance, even if the list was a
106				   bit longer. */
107	DRM_LOCK();
108	TAILQ_FOREACH(map, &dev->maplist, link) {
109		if (offset >= map->offset && offset < map->offset + map->size)
110			break;
111	}
112
113	if (map == NULL) {
114		DRM_DEBUG("Can't find map, requested offset = %" PRIx64 "\n",
115		    offset);
116		TAILQ_FOREACH(map, &dev->maplist, link) {
117			DRM_DEBUG("map offset = %016lx, handle = %016lx\n",
118			map->offset, (unsigned long)map->handle);
119		}
120		DRM_UNLOCK();
121		return -1;
122	}
123	if (((map->flags&_DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) {
124		DRM_UNLOCK();
125		DRM_DEBUG("restricted map\n");
126		return -1;
127	}
128	type = map->type;
129#if	defined(__NetBSD__)
130	map_offs = map->offset;
131#endif
132	DRM_UNLOCK();
133
134	switch (type) {
135	case _DRM_FRAME_BUFFER:
136	case _DRM_REGISTERS:
137	case _DRM_AGP:
138#if	defined(__NetBSD__)
139		flags = BUS_SPACE_MAP_LINEAR;
140		if (type == _DRM_FRAME_BUFFER || type == _DRM_AGP)
141			flags |= BUS_SPACE_MAP_PREFETCHABLE;
142		phys = bus_space_mmap(dev->pa.pa_memt, map->offset,
143				offset - map->offset, prot, flags);
144		if (phys == -1) {
145			DRM_ERROR("bus_space_mmap for %" PRIx64 " failed\n", offset);
146			return -1;
147		}
148		return phys;
149#else
150		phys = offset;
151#endif
152		break;
153	case _DRM_CONSISTENT:
154		phys = vtophys((vaddr_t)((char *)map->handle + (offset - map->offset)));
155		break;
156	case _DRM_SCATTER_GATHER:
157	case _DRM_SHM:
158		phys = vtophys(offset);
159		break;
160	default:
161		DRM_ERROR("bad map type %d\n", type);
162		return -1;	/* This should never happen. */
163	}
164
165#if defined(__FreeBSD__)
166	*paddr = phys;
167	return 0;
168#elif   defined(__NetBSD__)
169	return atop(phys);
170#endif
171}
172
173