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Diffstat (limited to 'drivers/gpu/drm/ttm/ttm_agp_backend.c')
-rw-r--r--drivers/gpu/drm/ttm/ttm_agp_backend.c150
1 files changed, 150 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_agp_backend.c b/drivers/gpu/drm/ttm/ttm_agp_backend.c
new file mode 100644
index 00000000000..e8f6d2229d8
--- /dev/null
+++ b/drivers/gpu/drm/ttm/ttm_agp_backend.c
@@ -0,0 +1,150 @@
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
41struct ttm_agp_backend {
42 struct ttm_backend backend;
43 struct agp_memory *mem;
44 struct agp_bridge_data *bridge;
45};
46
47static 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
73static 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
91static 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
102static 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
115static 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
125static 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
133struct 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}
148EXPORT_SYMBOL(ttm_agp_backend_init);
149
150#endif
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