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1 | /************************************************************************** |
2 | * | |
3 | * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA | |
4 | * All Rights Reserved. | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a | |
7 | * copy of this software and associated documentation files (the | |
8 | * "Software"), to deal in the Software without restriction, including | |
9 | * without limitation the rights to use, copy, modify, merge, publish, | |
10 | * distribute, sub license, and/or sell copies of the Software, and to | |
11 | * permit persons to whom the Software is furnished to do so, subject to | |
12 | * the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice (including the | |
15 | * next paragraph) shall be included in all copies or substantial portions | |
16 | * of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL | |
21 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, | |
22 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
23 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | |
24 | * USE OR OTHER DEALINGS IN THE SOFTWARE. | |
25 | * | |
26 | **************************************************************************/ | |
27 | /* | |
28 | * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> | |
29 | * Keith Packard. | |
30 | */ | |
31 | ||
32 | #include "ttm/ttm_module.h" | |
33 | #include "ttm/ttm_bo_driver.h" | |
34 | #ifdef TTM_HAS_AGP | |
35 | #include "ttm/ttm_placement.h" | |
36 | #include <linux/agp_backend.h> | |
37 | #include <linux/module.h> | |
5a0e3ad6 | 38 | #include <linux/slab.h> |
ba4e7d97 TH |
39 | #include <linux/io.h> |
40 | #include <asm/agp.h> | |
41 | ||
42 | struct ttm_agp_backend { | |
43 | struct ttm_backend backend; | |
44 | struct agp_memory *mem; | |
45 | struct agp_bridge_data *bridge; | |
46 | }; | |
47 | ||
48 | static int ttm_agp_populate(struct ttm_backend *backend, | |
49 | unsigned long num_pages, struct page **pages, | |
50 | struct page *dummy_read_page) | |
51 | { | |
52 | struct ttm_agp_backend *agp_be = | |
53 | container_of(backend, struct ttm_agp_backend, backend); | |
54 | struct page **cur_page, **last_page = pages + num_pages; | |
55 | struct agp_memory *mem; | |
56 | ||
57 | mem = agp_allocate_memory(agp_be->bridge, num_pages, AGP_USER_MEMORY); | |
58 | if (unlikely(mem == NULL)) | |
59 | return -ENOMEM; | |
60 | ||
61 | mem->page_count = 0; | |
62 | for (cur_page = pages; cur_page < last_page; ++cur_page) { | |
63 | struct page *page = *cur_page; | |
64 | if (!page) | |
65 | page = dummy_read_page; | |
66 | ||
07613ba2 | 67 | mem->pages[mem->page_count++] = page; |
ba4e7d97 TH |
68 | } |
69 | agp_be->mem = mem; | |
70 | return 0; | |
71 | } | |
72 | ||
73 | static int ttm_agp_bind(struct ttm_backend *backend, struct ttm_mem_reg *bo_mem) | |
74 | { | |
75 | struct ttm_agp_backend *agp_be = | |
76 | container_of(backend, struct ttm_agp_backend, backend); | |
77 | struct agp_memory *mem = agp_be->mem; | |
78 | int cached = (bo_mem->placement & TTM_PL_FLAG_CACHED); | |
79 | int ret; | |
80 | ||
81 | mem->is_flushed = 1; | |
82 | mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY; | |
83 | ||
84 | ret = agp_bind_memory(mem, bo_mem->mm_node->start); | |
85 | if (ret) | |
86 | printk(KERN_ERR TTM_PFX "AGP Bind memory failed.\n"); | |
87 | ||
88 | return ret; | |
89 | } | |
90 | ||
91 | static int ttm_agp_unbind(struct ttm_backend *backend) | |
92 | { | |
93 | struct ttm_agp_backend *agp_be = | |
94 | container_of(backend, struct ttm_agp_backend, backend); | |
95 | ||
96 | if (agp_be->mem->is_bound) | |
97 | return agp_unbind_memory(agp_be->mem); | |
98 | else | |
99 | return 0; | |
100 | } | |
101 | ||
102 | static void ttm_agp_clear(struct ttm_backend *backend) | |
103 | { | |
104 | struct ttm_agp_backend *agp_be = | |
105 | container_of(backend, struct ttm_agp_backend, backend); | |
106 | struct agp_memory *mem = agp_be->mem; | |
107 | ||
108 | if (mem) { | |
109 | ttm_agp_unbind(backend); | |
110 | agp_free_memory(mem); | |
111 | } | |
112 | agp_be->mem = NULL; | |
113 | } | |
114 | ||
115 | static void ttm_agp_destroy(struct ttm_backend *backend) | |
116 | { | |
117 | struct ttm_agp_backend *agp_be = | |
118 | container_of(backend, struct ttm_agp_backend, backend); | |
119 | ||
120 | if (agp_be->mem) | |
121 | ttm_agp_clear(backend); | |
122 | kfree(agp_be); | |
123 | } | |
124 | ||
125 | static struct ttm_backend_func ttm_agp_func = { | |
126 | .populate = ttm_agp_populate, | |
127 | .clear = ttm_agp_clear, | |
128 | .bind = ttm_agp_bind, | |
129 | .unbind = ttm_agp_unbind, | |
130 | .destroy = ttm_agp_destroy, | |
131 | }; | |
132 | ||
133 | struct ttm_backend *ttm_agp_backend_init(struct ttm_bo_device *bdev, | |
134 | struct agp_bridge_data *bridge) | |
135 | { | |
136 | struct ttm_agp_backend *agp_be; | |
137 | ||
138 | agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL); | |
139 | if (!agp_be) | |
140 | return NULL; | |
141 | ||
142 | agp_be->mem = NULL; | |
143 | agp_be->bridge = bridge; | |
144 | agp_be->backend.func = &ttm_agp_func; | |
145 | agp_be->backend.bdev = bdev; | |
146 | return &agp_be->backend; | |
147 | } | |
148 | EXPORT_SYMBOL(ttm_agp_backend_init); | |
149 | ||
150 | #endif |