summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/gpu/drm/drm_memory.c
blob: a521ef6ff8072ab7e65508b5da98b84dc058bfa0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/**
 * \file drm_memory.c
 * Memory management wrappers for DRM
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * Created: Thu Feb  4 14:00:34 1999 by faith@valinux.com
 *
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include <linux/highmem.h>
#include <linux/export.h>
#include <drm/drmP.h>
#include "drm_legacy.h"

#if __OS_HAS_AGP

#ifdef HAVE_PAGE_AGP
# include <asm/agp.h>
#else
# ifdef __powerpc__
#  define PAGE_AGP	__pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
# else
#  define PAGE_AGP	PAGE_KERNEL
# endif
#endif

static void *agp_remap(unsigned long offset, unsigned long size,
		       struct drm_device * dev)
{
	unsigned long i, num_pages =
	    PAGE_ALIGN(size) / PAGE_SIZE;
	struct drm_agp_mem *agpmem;
	struct page **page_map;
	struct page **phys_page_map;
	void *addr;

	size = PAGE_ALIGN(size);

#ifdef __alpha__
	offset -= dev->hose->mem_space->start;
#endif

	list_for_each_entry(agpmem, &dev->agp->memory, head)
		if (agpmem->bound <= offset
		    && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
		    (offset + size))
			break;
	if (&agpmem->head == &dev->agp->memory)
		return NULL;

	/*
	 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
	 * the CPU do not get remapped by the GART.  We fix this by using the kernel's
	 * page-table instead (that's probably faster anyhow...).
	 */
	/* note: use vmalloc() because num_pages could be large... */
	page_map = vmalloc(num_pages * sizeof(struct page *));
	if (!page_map)
		return NULL;

	phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE);
	for (i = 0; i < num_pages; ++i)
		page_map[i] = phys_page_map[i];
	addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
	vfree(page_map);

	return addr;
}

/** Wrapper around agp_free_memory() */
void drm_free_agp(struct agp_memory * handle, int pages)
{
	agp_free_memory(handle);
}

/** Wrapper around agp_bind_memory() */
int drm_bind_agp(struct agp_memory * handle, unsigned int start)
{
	return agp_bind_memory(handle, start);
}

/** Wrapper around agp_unbind_memory() */
int drm_unbind_agp(struct agp_memory * handle)
{
	return agp_unbind_memory(handle);
}

#else  /*  __OS_HAS_AGP  */
static inline void *agp_remap(unsigned long offset, unsigned long size,
			      struct drm_device * dev)
{
	return NULL;
}

#endif				/* agp */

void drm_legacy_ioremap(struct drm_local_map *map, struct drm_device *dev)
{
	if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
		map->handle = agp_remap(map->offset, map->size, dev);
	else
		map->handle = ioremap(map->offset, map->size);
}
EXPORT_SYMBOL(drm_legacy_ioremap);

void drm_legacy_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
{
	if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
		map->handle = agp_remap(map->offset, map->size, dev);
	else
		map->handle = ioremap_wc(map->offset, map->size);
}
EXPORT_SYMBOL(drm_legacy_ioremap_wc);

void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
{
	if (!map->handle || !map->size)
		return;

	if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
		vunmap(map->handle);
	else
		iounmap(map->handle);
}
EXPORT_SYMBOL(drm_legacy_ioremapfree);