Merge branch 'for-2.6.31' of git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6
[linux-2.6] / drivers / gpu / drm / ttm / ttm_agp_backend.c
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>
38 #include <linux/io.h>
39 #include <asm/agp.h>
40
41 struct ttm_agp_backend {
42         struct ttm_backend backend;
43         struct agp_memory *mem;
44         struct agp_bridge_data *bridge;
45 };
46
47 static int ttm_agp_populate(struct ttm_backend *backend,
48                             unsigned long num_pages, struct page **pages,
49                             struct page *dummy_read_page)
50 {
51         struct ttm_agp_backend *agp_be =
52             container_of(backend, struct ttm_agp_backend, backend);
53         struct page **cur_page, **last_page = pages + num_pages;
54         struct agp_memory *mem;
55
56         mem = agp_allocate_memory(agp_be->bridge, num_pages, AGP_USER_MEMORY);
57         if (unlikely(mem == NULL))
58                 return -ENOMEM;
59
60         mem->page_count = 0;
61         for (cur_page = pages; cur_page < last_page; ++cur_page) {
62                 struct page *page = *cur_page;
63                 if (!page)
64                         page = dummy_read_page;
65
66                 mem->memory[mem->page_count++] =
67                     phys_to_gart(page_to_phys(page));
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