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/** @file drm_vm.c
38 * Support code for mmaping of DRM maps.
39 */
40
41#include <dev/drm2/drmP.h>
42#include <dev/drm2/drm.h>
43
44#ifdef FREEBSD_NOTYET
45int
46drm_mmap(struct cdev *kdev, vm_ooffset_t offset, vm_paddr_t *paddr,
47    int prot, vm_memattr_t *memattr)
48{
49	struct drm_device *dev = drm_get_device_from_kdev(kdev);
50	struct drm_file *file_priv = NULL;
51	drm_local_map_t *map;
52	enum drm_map_type type;
53	vm_paddr_t phys;
54	int error;
55
56	/* d_mmap gets called twice, we can only reference file_priv during
57	 * the first call.  We need to assume that if error is EBADF the
58	 * call was successful and the client is authenticated.
59	 */
60	error = devfs_get_cdevpriv((void **)&file_priv);
61	if (error == ENOENT) {
62		DRM_ERROR("Could not find authenticator!\n");
63		return EINVAL;
64	}
65
66	if (file_priv && !file_priv->authenticated)
67		return EACCES;
68
69	DRM_DEBUG("called with offset %016jx\n", offset);
70	if (dev->dma && offset < ptoa(dev->dma->page_count)) {
71		drm_device_dma_t *dma = dev->dma;
72
73		DRM_SPINLOCK(&dev->dma_lock);
74
75		if (dma->pagelist != NULL) {
76			unsigned long page = offset >> PAGE_SHIFT;
77			unsigned long phys = dma->pagelist[page];
78
79			DRM_SPINUNLOCK(&dev->dma_lock);
80			*paddr = phys;
81			return 0;
82		} else {
83			DRM_SPINUNLOCK(&dev->dma_lock);
84			return -1;
85		}
86	}
87
88	/* A sequential search of a linked list is
89	   fine here because: 1) there will only be
90	   about 5-10 entries in the list and, 2) a
91	   DRI client only has to do this mapping
92	   once, so it doesn't have to be optimized
93	   for performance, even if the list was a
94	   bit longer.
95	*/
96	DRM_LOCK(dev);
97	TAILQ_FOREACH(map, &dev->maplist, link) {
98		if (offset >> DRM_MAP_HANDLE_SHIFT ==
99		    (unsigned long)map->handle >> DRM_MAP_HANDLE_SHIFT)
100			break;
101	}
102
103	if (map == NULL) {
104		DRM_DEBUG("Can't find map, request offset = %016jx\n", offset);
105		TAILQ_FOREACH(map, &dev->maplist, link) {
106			DRM_DEBUG("map offset = %016lx, handle = %016lx\n",
107			    map->offset, (unsigned long)map->handle);
108		}
109		DRM_UNLOCK(dev);
110		return -1;
111	}
112	if (((map->flags & _DRM_RESTRICTED) && !DRM_SUSER(DRM_CURPROC))) {
113		DRM_UNLOCK(dev);
114		DRM_DEBUG("restricted map\n");
115		return -1;
116	}
117	type = map->type;
118	DRM_UNLOCK(dev);
119
120	offset = offset & ((1ULL << DRM_MAP_HANDLE_SHIFT) - 1);
121
122	switch (type) {
123	case _DRM_FRAME_BUFFER:
124	case _DRM_AGP:
125		*memattr = VM_MEMATTR_WRITE_COMBINING;
126		/* FALLTHROUGH */
127	case _DRM_REGISTERS:
128		phys = map->offset + offset;
129		break;
130	case _DRM_SCATTER_GATHER:
131		*memattr = VM_MEMATTR_WRITE_COMBINING;
132		/* FALLTHROUGH */
133	case _DRM_CONSISTENT:
134	case _DRM_SHM:
135		phys = vtophys((char *)map->virtual + offset);
136		break;
137	default:
138		DRM_ERROR("bad map type %d\n", type);
139		return -1;	/* This should never happen. */
140	}
141
142	*paddr = phys;
143	return 0;
144}
145#endif /* FREEBSD_NOTYET */
146