1/**
2 * \file drm_vm.c
3 * Memory mapping for DRM
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
8
9/*
10 * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
11 *
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
15 *
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
22 *
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
25 * Software.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
34 */
35
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD$");
38
39/** @file drm_vm.c
40 * Support code for mmaping of DRM maps.
41 */
42
43#include <dev/drm2/drmP.h>
44#include <dev/drm2/drm.h>
45
46#ifdef FREEBSD_NOTYET
47int
48drm_mmap(struct cdev *kdev, vm_ooffset_t offset, vm_paddr_t *paddr,
49    int prot, vm_memattr_t *memattr)
50{
51	struct drm_device *dev = drm_get_device_from_kdev(kdev);
52	struct drm_file *file_priv = NULL;
53	drm_local_map_t *map;
54	enum drm_map_type type;
55	vm_paddr_t phys;
56	int error;
57
58	/* d_mmap gets called twice, we can only reference file_priv during
59	 * the first call.  We need to assume that if error is EBADF the
60	 * call was successful and the client is authenticated.
61	 */
62	error = devfs_get_cdevpriv((void **)&file_priv);
63	if (error == ENOENT) {
64		DRM_ERROR("Could not find authenticator!\n");
65		return EINVAL;
66	}
67
68	if (file_priv && !file_priv->authenticated)
69		return EACCES;
70
71	DRM_DEBUG("called with offset %016jx\n", offset);
72	if (dev->dma && offset < ptoa(dev->dma->page_count)) {
73		drm_device_dma_t *dma = dev->dma;
74
75		DRM_SPINLOCK(&dev->dma_lock);
76
77		if (dma->pagelist != NULL) {
78			unsigned long page = offset >> PAGE_SHIFT;
79			unsigned long phys = dma->pagelist[page];
80
81			DRM_SPINUNLOCK(&dev->dma_lock);
82			*paddr = phys;
83			return 0;
84		} else {
85			DRM_SPINUNLOCK(&dev->dma_lock);
86			return -1;
87		}
88	}
89
90	/* A sequential search of a linked list is
91	   fine here because: 1) there will only be
92	   about 5-10 entries in the list and, 2) a
93	   DRI client only has to do this mapping
94	   once, so it doesn't have to be optimized
95	   for performance, even if the list was a
96	   bit longer.
97	*/
98	DRM_LOCK(dev);
99	TAILQ_FOREACH(map, &dev->maplist, link) {
100		if (offset >> DRM_MAP_HANDLE_SHIFT ==
101		    (unsigned long)map->handle >> DRM_MAP_HANDLE_SHIFT)
102			break;
103	}
104
105	if (map == NULL) {
106		DRM_DEBUG("Can't find map, request offset = %016jx\n", offset);
107		TAILQ_FOREACH(map, &dev->maplist, link) {
108			DRM_DEBUG("map offset = %016lx, handle = %016lx\n",
109			    map->offset, (unsigned long)map->handle);
110		}
111		DRM_UNLOCK(dev);
112		return -1;
113	}
114	if (((map->flags & _DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) {
115		DRM_UNLOCK(dev);
116		DRM_DEBUG("restricted map\n");
117		return -1;
118	}
119	type = map->type;
120	DRM_UNLOCK(dev);
121
122	offset = offset & ((1ULL << DRM_MAP_HANDLE_SHIFT) - 1);
123
124	switch (type) {
125	case _DRM_FRAME_BUFFER:
126	case _DRM_AGP:
127		*memattr = VM_MEMATTR_WRITE_COMBINING;
128		/* FALLTHROUGH */
129	case _DRM_REGISTERS:
130		phys = map->offset + offset;
131		break;
132	case _DRM_SCATTER_GATHER:
133		*memattr = VM_MEMATTR_WRITE_COMBINING;
134		/* FALLTHROUGH */
135	case _DRM_CONSISTENT:
136	case _DRM_SHM:
137		phys = vtophys((char *)map->virtual + offset);
138		break;
139	default:
140		DRM_ERROR("bad map type %d\n", type);
141		return -1;	/* This should never happen. */
142	}
143
144	*paddr = phys;
145	return 0;
146}
147#endif /* FREEBSD_NOTYET */
148