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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 <linux/highmem.h>
37#include <linux/export.h>
38#include "drmP.h"
39
40/**
41 * Called when "/proc/dri/%dev%/mem" is read.
42 *
43 * \param buf output buffer.
44 * \param start start of output data.
45 * \param offset requested start offset.
46 * \param len requested number of bytes.
47 * \param eof whether there is no more data to return.
48 * \param data private data.
49 * \return number of written bytes.
50 *
51 * No-op.
52 */
53int drm_mem_info(char *buf, char **start, off_t offset,
54 int len, int *eof, void *data)
55{
56 return 0;
57}
58
59#if __OS_HAS_AGP
60static void *agp_remap(unsigned long offset, unsigned long size,
61 struct drm_device * dev)
62{
63 unsigned long i, num_pages =
64 PAGE_ALIGN(size) / PAGE_SIZE;
65 struct drm_agp_mem *agpmem;
66 struct page **page_map;
67 struct page **phys_page_map;
68 void *addr;
69
70 size = PAGE_ALIGN(size);
71
72#ifdef __alpha__
73 offset -= dev->hose->mem_space->start;
74#endif
75
76 list_for_each_entry(agpmem, &dev->agp->memory, head)
77 if (agpmem->bound <= offset
78 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
79 (offset + size))
80 break;
81 if (&agpmem->head == &dev->agp->memory)
82 return NULL;
83
84 /*
85 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
86 * the CPU do not get remapped by the GART. We fix this by using the kernel's
87 * page-table instead (that's probably faster anyhow...).
88 */
89 /* note: use vmalloc() because num_pages could be large... */
90 page_map = vmalloc(num_pages * sizeof(struct page *));
91 if (!page_map)
92 return NULL;
93
94 phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE);
95 for (i = 0; i < num_pages; ++i)
96 page_map[i] = phys_page_map[i];
97 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
98 vfree(page_map);
99
100 return addr;
101}
102
103/** Wrapper around agp_free_memory() */
104void drm_free_agp(DRM_AGP_MEM * handle, int pages)
105{
106 agp_free_memory(handle);
107}
108EXPORT_SYMBOL(drm_free_agp);
109
110/** Wrapper around agp_bind_memory() */
111int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
112{
113 return agp_bind_memory(handle, start);
114}
115
116/** Wrapper around agp_unbind_memory() */
117int drm_unbind_agp(DRM_AGP_MEM * handle)
118{
119 return agp_unbind_memory(handle);
120}
121EXPORT_SYMBOL(drm_unbind_agp);
122
123#else /* __OS_HAS_AGP */
124static inline void *agp_remap(unsigned long offset, unsigned long size,
125 struct drm_device * dev)
126{
127 return NULL;
128}
129
130#endif /* agp */
131
132void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev)
133{
134 if (drm_core_has_AGP(dev) &&
135 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
136 map->handle = agp_remap(map->offset, map->size, dev);
137 else
138 map->handle = ioremap(map->offset, map->size);
139}
140EXPORT_SYMBOL(drm_core_ioremap);
141
142void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
143{
144 if (drm_core_has_AGP(dev) &&
145 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
146 map->handle = agp_remap(map->offset, map->size, dev);
147 else
148 map->handle = ioremap_wc(map->offset, map->size);
149}
150EXPORT_SYMBOL(drm_core_ioremap_wc);
151
152void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
153{
154 if (!map->handle || !map->size)
155 return;
156
157 if (drm_core_has_AGP(dev) &&
158 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
159 vunmap(map->handle);
160 else
161 iounmap(map->handle);
162}
163EXPORT_SYMBOL(drm_core_ioremapfree);