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b5e89ed5 DA |
1 | /** |
2 | * \file drm_memory.c | |
1da177e4 LT |
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 | ||
b5e89ed5 | 9 | /* |
1da177e4 LT |
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 | ||
1da177e4 | 36 | #include <linux/highmem.h> |
2d1a8a48 | 37 | #include <linux/export.h> |
1da177e4 LT |
38 | #include "drmP.h" |
39 | ||
1da177e4 LT |
40 | /** |
41 | * Called when "/proc/dri/%dev%/mem" is read. | |
b5e89ed5 | 42 | * |
1da177e4 LT |
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 | * | |
b5e89ed5 | 51 | * No-op. |
1da177e4 LT |
52 | */ |
53 | int drm_mem_info(char *buf, char **start, off_t offset, | |
b5e89ed5 | 54 | int len, int *eof, void *data) |
1da177e4 LT |
55 | { |
56 | return 0; | |
57 | } | |
58 | ||
1da177e4 | 59 | #if __OS_HAS_AGP |
031de96a | 60 | static void *agp_remap(unsigned long offset, unsigned long size, |
84b1fd10 | 61 | struct drm_device * dev) |
31f64bd1 | 62 | { |
07613ba2 | 63 | unsigned long i, num_pages = |
31f64bd1 DA |
64 | PAGE_ALIGN(size) / PAGE_SIZE; |
65 | struct drm_agp_mem *agpmem; | |
66 | struct page **page_map; | |
07613ba2 | 67 | struct page **phys_page_map; |
31f64bd1 DA |
68 | void *addr; |
69 | ||
70 | size = PAGE_ALIGN(size); | |
71 | ||
72 | #ifdef __alpha__ | |
73 | offset -= dev->hose->mem_space->start; | |
74 | #endif | |
75 | ||
bd1b331f | 76 | list_for_each_entry(agpmem, &dev->agp->memory, head) |
31f64bd1 DA |
77 | if (agpmem->bound <= offset |
78 | && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= | |
79 | (offset + size)) | |
80 | break; | |
404b017d | 81 | if (&agpmem->head == &dev->agp->memory) |
31f64bd1 DA |
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 | ||
07613ba2 | 94 | phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE); |
31f64bd1 | 95 | for (i = 0; i < num_pages; ++i) |
07613ba2 | 96 | page_map[i] = phys_page_map[i]; |
31f64bd1 DA |
97 | addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP); |
98 | vfree(page_map); | |
99 | ||
100 | return addr; | |
101 | } | |
102 | ||
1da177e4 | 103 | /** Wrapper around agp_free_memory() */ |
690bb51b | 104 | void drm_free_agp(DRM_AGP_MEM * handle, int pages) |
1da177e4 | 105 | { |
89c37264 | 106 | agp_free_memory(handle); |
1da177e4 | 107 | } |
673a394b | 108 | EXPORT_SYMBOL(drm_free_agp); |
b5e89ed5 | 109 | |
1da177e4 | 110 | /** Wrapper around agp_bind_memory() */ |
b5e89ed5 | 111 | int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start) |
1da177e4 | 112 | { |
89c37264 | 113 | return agp_bind_memory(handle, start); |
1da177e4 | 114 | } |
b5e89ed5 | 115 | |
1da177e4 | 116 | /** Wrapper around agp_unbind_memory() */ |
b5e89ed5 | 117 | int drm_unbind_agp(DRM_AGP_MEM * handle) |
1da177e4 | 118 | { |
89c37264 | 119 | return agp_unbind_memory(handle); |
1da177e4 | 120 | } |
673a394b | 121 | EXPORT_SYMBOL(drm_unbind_agp); |
031de96a AB |
122 | |
123 | #else /* __OS_HAS_AGP */ | |
031de96a | 124 | static inline void *agp_remap(unsigned long offset, unsigned long size, |
84b1fd10 | 125 | struct drm_device * dev) |
031de96a AB |
126 | { |
127 | return NULL; | |
128 | } | |
129 | ||
b5e89ed5 | 130 | #endif /* agp */ |
31f64bd1 | 131 | |
f77d390c | 132 | void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev) |
31f64bd1 | 133 | { |
004a7727 CH |
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); | |
31f64bd1 | 139 | } |
004a7727 | 140 | EXPORT_SYMBOL(drm_core_ioremap); |
31f64bd1 | 141 | |
f77d390c | 142 | void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev) |
242e3df8 | 143 | { |
9b8d5a12 DA |
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); | |
242e3df8 DA |
149 | } |
150 | EXPORT_SYMBOL(drm_core_ioremap_wc); | |
9b8d5a12 | 151 | |
f77d390c | 152 | void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev) |
31f64bd1 | 153 | { |
004a7727 CH |
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); | |
31f64bd1 | 162 | } |
004a7727 | 163 | EXPORT_SYMBOL(drm_core_ioremapfree); |