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1da177e4 LT |
1 | /** |
2 | * \file drm_memory.h | |
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/config.h> | |
37 | #include <linux/highmem.h> | |
38 | #include <linux/vmalloc.h> | |
39 | #include "drmP.h" | |
40 | ||
41 | /** | |
42 | * Cut down version of drm_memory_debug.h, which used to be called | |
43 | * drm_memory.h. | |
44 | */ | |
45 | ||
46 | #if __OS_HAS_AGP | |
47 | ||
48 | #include <linux/vmalloc.h> | |
49 | ||
50 | #ifdef HAVE_PAGE_AGP | |
51 | #include <asm/agp.h> | |
52 | #else | |
53 | # ifdef __powerpc__ | |
54 | # define PAGE_AGP __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE) | |
55 | # else | |
56 | # define PAGE_AGP PAGE_KERNEL | |
57 | # endif | |
58 | #endif | |
59 | ||
60 | /* | |
61 | * Find the drm_map that covers the range [offset, offset+size). | |
62 | */ | |
63 | static inline drm_map_t * | |
64 | drm_lookup_map (unsigned long offset, unsigned long size, drm_device_t *dev) | |
65 | { | |
66 | struct list_head *list; | |
67 | drm_map_list_t *r_list; | |
68 | drm_map_t *map; | |
69 | ||
70 | list_for_each(list, &dev->maplist->head) { | |
71 | r_list = (drm_map_list_t *) list; | |
72 | map = r_list->map; | |
73 | if (!map) | |
74 | continue; | |
75 | if (map->offset <= offset && (offset + size) <= (map->offset + map->size)) | |
76 | return map; | |
77 | } | |
78 | return NULL; | |
79 | } | |
80 | ||
81 | static inline void * | |
82 | agp_remap (unsigned long offset, unsigned long size, drm_device_t *dev) | |
83 | { | |
84 | unsigned long *phys_addr_map, i, num_pages = PAGE_ALIGN(size) / PAGE_SIZE; | |
85 | struct drm_agp_mem *agpmem; | |
86 | struct page **page_map; | |
87 | void *addr; | |
88 | ||
89 | size = PAGE_ALIGN(size); | |
90 | ||
91 | #ifdef __alpha__ | |
92 | offset -= dev->hose->mem_space->start; | |
93 | #endif | |
94 | ||
95 | for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) | |
96 | if (agpmem->bound <= offset | |
97 | && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= (offset + size)) | |
98 | break; | |
99 | if (!agpmem) | |
100 | return NULL; | |
101 | ||
102 | /* | |
103 | * OK, we're mapping AGP space on a chipset/platform on which memory accesses by | |
104 | * the CPU do not get remapped by the GART. We fix this by using the kernel's | |
105 | * page-table instead (that's probably faster anyhow...). | |
106 | */ | |
107 | /* note: use vmalloc() because num_pages could be large... */ | |
108 | page_map = vmalloc(num_pages * sizeof(struct page *)); | |
109 | if (!page_map) | |
110 | return NULL; | |
111 | ||
112 | phys_addr_map = agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE; | |
113 | for (i = 0; i < num_pages; ++i) | |
114 | page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT); | |
115 | addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP); | |
116 | vfree(page_map); | |
117 | ||
118 | return addr; | |
119 | } | |
120 | ||
121 | static inline unsigned long | |
122 | drm_follow_page (void *vaddr) | |
123 | { | |
124 | pgd_t *pgd = pgd_offset_k((unsigned long) vaddr); | |
125 | pud_t *pud = pud_offset(pgd, (unsigned long) vaddr); | |
126 | pmd_t *pmd = pmd_offset(pud, (unsigned long) vaddr); | |
127 | pte_t *ptep = pte_offset_kernel(pmd, (unsigned long) vaddr); | |
128 | return pte_pfn(*ptep) << PAGE_SHIFT; | |
129 | } | |
130 | ||
131 | #else /* __OS_HAS_AGP */ | |
132 | ||
133 | static inline drm_map_t *drm_lookup_map(unsigned long offset, unsigned long size, drm_device_t *dev) | |
134 | { | |
135 | return NULL; | |
136 | } | |
137 | ||
138 | static inline void *agp_remap(unsigned long offset, unsigned long size, drm_device_t *dev) | |
139 | { | |
140 | return NULL; | |
141 | } | |
142 | ||
143 | static inline unsigned long drm_follow_page (void *vaddr) | |
144 | { | |
145 | return 0; | |
146 | } | |
147 | ||
148 | #endif | |
149 | ||
150 | static inline void *drm_ioremap(unsigned long offset, unsigned long size, drm_device_t *dev) | |
151 | { | |
152 | if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture) { | |
153 | drm_map_t *map = drm_lookup_map(offset, size, dev); | |
154 | ||
155 | if (map && map->type == _DRM_AGP) | |
156 | return agp_remap(offset, size, dev); | |
157 | } | |
158 | return ioremap(offset, size); | |
159 | } | |
160 | ||
161 | static inline void *drm_ioremap_nocache(unsigned long offset, unsigned long size, | |
162 | drm_device_t *dev) | |
163 | { | |
164 | if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture) { | |
165 | drm_map_t *map = drm_lookup_map(offset, size, dev); | |
166 | ||
167 | if (map && map->type == _DRM_AGP) | |
168 | return agp_remap(offset, size, dev); | |
169 | } | |
170 | return ioremap_nocache(offset, size); | |
171 | } | |
172 | ||
173 | static inline void drm_ioremapfree(void *pt, unsigned long size, drm_device_t *dev) | |
174 | { | |
175 | /* | |
176 | * This is a bit ugly. It would be much cleaner if the DRM API would use separate | |
177 | * routines for handling mappings in the AGP space. Hopefully this can be done in | |
178 | * a future revision of the interface... | |
179 | */ | |
180 | if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture | |
181 | && ((unsigned long) pt >= VMALLOC_START && (unsigned long) pt < VMALLOC_END)) | |
182 | { | |
183 | unsigned long offset; | |
184 | drm_map_t *map; | |
185 | ||
186 | offset = drm_follow_page(pt) | ((unsigned long) pt & ~PAGE_MASK); | |
187 | map = drm_lookup_map(offset, size, dev); | |
188 | if (map && map->type == _DRM_AGP) { | |
189 | vunmap(pt); | |
190 | return; | |
191 | } | |
192 | } | |
193 | ||
194 | iounmap(pt); | |
195 | } | |
196 | ||
197 |