Commit | Line | Data |
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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> |
760285e7 | 38 | #include <drm/drmP.h> |
cc5ea594 | 39 | #include "drm_legacy.h" |
1da177e4 | 40 | |
a7fb8a23 | 41 | #if IS_ENABLED(CONFIG_AGP) |
d6db6564 DH |
42 | |
43 | #ifdef HAVE_PAGE_AGP | |
44 | # include <asm/agp.h> | |
45 | #else | |
46 | # ifdef __powerpc__ | |
37035e74 | 47 | # define PAGE_AGP pgprot_noncached_wc(PAGE_KERNEL) |
d6db6564 DH |
48 | # else |
49 | # define PAGE_AGP PAGE_KERNEL | |
50 | # endif | |
51 | #endif | |
52 | ||
031de96a | 53 | static void *agp_remap(unsigned long offset, unsigned long size, |
84b1fd10 | 54 | struct drm_device * dev) |
31f64bd1 | 55 | { |
07613ba2 | 56 | unsigned long i, num_pages = |
31f64bd1 DA |
57 | PAGE_ALIGN(size) / PAGE_SIZE; |
58 | struct drm_agp_mem *agpmem; | |
59 | struct page **page_map; | |
07613ba2 | 60 | struct page **phys_page_map; |
31f64bd1 DA |
61 | void *addr; |
62 | ||
63 | size = PAGE_ALIGN(size); | |
64 | ||
65 | #ifdef __alpha__ | |
66 | offset -= dev->hose->mem_space->start; | |
67 | #endif | |
68 | ||
bd1b331f | 69 | list_for_each_entry(agpmem, &dev->agp->memory, head) |
31f64bd1 DA |
70 | if (agpmem->bound <= offset |
71 | && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= | |
72 | (offset + size)) | |
73 | break; | |
404b017d | 74 | if (&agpmem->head == &dev->agp->memory) |
31f64bd1 DA |
75 | return NULL; |
76 | ||
77 | /* | |
78 | * OK, we're mapping AGP space on a chipset/platform on which memory accesses by | |
79 | * the CPU do not get remapped by the GART. We fix this by using the kernel's | |
80 | * page-table instead (that's probably faster anyhow...). | |
81 | */ | |
82 | /* note: use vmalloc() because num_pages could be large... */ | |
83 | page_map = vmalloc(num_pages * sizeof(struct page *)); | |
84 | if (!page_map) | |
85 | return NULL; | |
86 | ||
07613ba2 | 87 | phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE); |
31f64bd1 | 88 | for (i = 0; i < num_pages; ++i) |
07613ba2 | 89 | page_map[i] = phys_page_map[i]; |
31f64bd1 DA |
90 | addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP); |
91 | vfree(page_map); | |
92 | ||
93 | return addr; | |
94 | } | |
95 | ||
1da177e4 | 96 | /** Wrapper around agp_free_memory() */ |
d2e546b8 | 97 | void drm_free_agp(struct agp_memory * handle, int pages) |
1da177e4 | 98 | { |
89c37264 | 99 | agp_free_memory(handle); |
1da177e4 | 100 | } |
b5e89ed5 | 101 | |
1da177e4 | 102 | /** Wrapper around agp_bind_memory() */ |
d2e546b8 | 103 | int drm_bind_agp(struct agp_memory * handle, unsigned int start) |
1da177e4 | 104 | { |
89c37264 | 105 | return agp_bind_memory(handle, start); |
1da177e4 | 106 | } |
b5e89ed5 | 107 | |
1da177e4 | 108 | /** Wrapper around agp_unbind_memory() */ |
d2e546b8 | 109 | int drm_unbind_agp(struct agp_memory * handle) |
1da177e4 | 110 | { |
89c37264 | 111 | return agp_unbind_memory(handle); |
1da177e4 | 112 | } |
031de96a | 113 | |
a7fb8a23 | 114 | #else /* CONFIG_AGP */ |
031de96a | 115 | static inline void *agp_remap(unsigned long offset, unsigned long size, |
84b1fd10 | 116 | struct drm_device * dev) |
031de96a AB |
117 | { |
118 | return NULL; | |
119 | } | |
120 | ||
a7fb8a23 | 121 | #endif /* CONFIG_AGP */ |
31f64bd1 | 122 | |
86c1fbd5 | 123 | void drm_legacy_ioremap(struct drm_local_map *map, struct drm_device *dev) |
31f64bd1 | 124 | { |
d9906753 | 125 | if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) |
004a7727 CH |
126 | map->handle = agp_remap(map->offset, map->size, dev); |
127 | else | |
128 | map->handle = ioremap(map->offset, map->size); | |
31f64bd1 | 129 | } |
86c1fbd5 | 130 | EXPORT_SYMBOL(drm_legacy_ioremap); |
31f64bd1 | 131 | |
86c1fbd5 | 132 | void drm_legacy_ioremap_wc(struct drm_local_map *map, struct drm_device *dev) |
242e3df8 | 133 | { |
d9906753 | 134 | if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) |
9b8d5a12 DA |
135 | map->handle = agp_remap(map->offset, map->size, dev); |
136 | else | |
137 | map->handle = ioremap_wc(map->offset, map->size); | |
242e3df8 | 138 | } |
86c1fbd5 | 139 | EXPORT_SYMBOL(drm_legacy_ioremap_wc); |
9b8d5a12 | 140 | |
86c1fbd5 | 141 | void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev) |
31f64bd1 | 142 | { |
004a7727 CH |
143 | if (!map->handle || !map->size) |
144 | return; | |
145 | ||
d9906753 | 146 | if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) |
004a7727 CH |
147 | vunmap(map->handle); |
148 | else | |
149 | iounmap(map->handle); | |
31f64bd1 | 150 | } |
86c1fbd5 | 151 | EXPORT_SYMBOL(drm_legacy_ioremapfree); |