drm_memory.c revision 280183 
1/**
2 * \file drm_memory.c
3 * Memory management wrappers for DRM
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
8
9/*
10 * Created: Thu Feb  4 14:00:34 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: head/sys/dev/drm2/drm_memory.c 280183 2015-03-17 18:50:33Z dumbbell $");
38
39#include <dev/drm2/drmP.h>
40
41#if __OS_HAS_AGP
42static void *agp_remap(unsigned long offset, unsigned long size,
43		       struct drm_device * dev)
44{
45	/*
46	 * FIXME Linux<->FreeBSD: Not implemented. This is never called
47	 * on FreeBSD anyway, because drm_agp_mem->cant_use_aperture is
48	 * set to 0.
49	 */
50	return NULL;
51}
52
53#define	vunmap(handle)
54
55/** Wrapper around agp_free_memory() */
56void drm_free_agp(DRM_AGP_MEM * handle, int pages)
57{
58	device_t agpdev;
59
60	agpdev = agp_find_device();
61	if (!agpdev || !handle)
62		return;
63
64	agp_free_memory(agpdev, handle);
65}
66EXPORT_SYMBOL(drm_free_agp);
67
68/** Wrapper around agp_bind_memory() */
69int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
70{
71	device_t agpdev;
72
73	agpdev = agp_find_device();
74	if (!agpdev || !handle)
75		return -EINVAL;
76
77	return -agp_bind_memory(agpdev, handle, start * PAGE_SIZE);
78}
79
80/** Wrapper around agp_unbind_memory() */
81int drm_unbind_agp(DRM_AGP_MEM * handle)
82{
83	device_t agpdev;
84
85	agpdev = agp_find_device();
86	if (!agpdev || !handle)
87		return -EINVAL;
88
89	return -agp_unbind_memory(agpdev, handle);
90}
91EXPORT_SYMBOL(drm_unbind_agp);
92
93#else  /*  __OS_HAS_AGP  */
94static inline void *agp_remap(unsigned long offset, unsigned long size,
95			      struct drm_device * dev)
96{
97	return NULL;
98}
99
100#endif				/* agp */
101
102void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev)
103{
104	if (drm_core_has_AGP(dev) &&
105	    dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
106		map->handle = agp_remap(map->offset, map->size, dev);
107	else
108		map->handle = pmap_mapdev(map->offset, map->size);
109}
110EXPORT_SYMBOL(drm_core_ioremap);
111
112void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
113{
114	if (drm_core_has_AGP(dev) &&
115	    dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
116		map->handle = agp_remap(map->offset, map->size, dev);
117	else
118		map->handle = pmap_mapdev_attr(map->offset, map->size,
119		    VM_MEMATTR_WRITE_COMBINING);
120}
121EXPORT_SYMBOL(drm_core_ioremap_wc);
122
123void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
124{
125	if (!map->handle || !map->size)
126		return;
127
128	if (drm_core_has_AGP(dev) &&
129	    dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
130		vunmap(map->handle);
131	else
132		pmap_unmapdev((vm_offset_t)map->handle, map->size);
133}
134EXPORT_SYMBOL(drm_core_ioremapfree);
135