tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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->pages[mem->page_count++] = page;
67 }
68 agp_be->mem = mem;
69 return 0;
70}
71
72static int ttm_agp_bind(struct ttm_backend *backend, struct ttm_mem_reg *bo_mem)
73{
74 struct ttm_agp_backend *agp_be =
75 container_of(backend, struct ttm_agp_backend, backend);
76 struct agp_memory *mem = agp_be->mem;
77 int cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
78 int ret;
79
80 mem->is_flushed = 1;
81 mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
82
83 ret = agp_bind_memory(mem, bo_mem->mm_node->start);
84 if (ret)
85 printk(KERN_ERR TTM_PFX "AGP Bind memory failed.\n");
86
87 return ret;
88}
89
90static int ttm_agp_unbind(struct ttm_backend *backend)
91{
92 struct ttm_agp_backend *agp_be =
93 container_of(backend, struct ttm_agp_backend, backend);
94
95 if (agp_be->mem->is_bound)
96 return agp_unbind_memory(agp_be->mem);
97 else
98 return 0;
99}
100
101static void ttm_agp_clear(struct ttm_backend *backend)
102{
103 struct ttm_agp_backend *agp_be =
104 container_of(backend, struct ttm_agp_backend, backend);
105 struct agp_memory *mem = agp_be->mem;
106
107 if (mem) {
108 ttm_agp_unbind(backend);
109 agp_free_memory(mem);
110 }
111 agp_be->mem = NULL;
112}
113
114static void ttm_agp_destroy(struct ttm_backend *backend)
115{
116 struct ttm_agp_backend *agp_be =
117 container_of(backend, struct ttm_agp_backend, backend);
118
119 if (agp_be->mem)
120 ttm_agp_clear(backend);
121 kfree(agp_be);
122}
123
124static struct ttm_backend_func ttm_agp_func = {
125 .populate = ttm_agp_populate,
126 .clear = ttm_agp_clear,
127 .bind = ttm_agp_bind,
128 .unbind = ttm_agp_unbind,
129 .destroy = ttm_agp_destroy,
130};
131
132struct ttm_backend *ttm_agp_backend_init(struct ttm_bo_device *bdev,
133 struct agp_bridge_data *bridge)
134{
135 struct ttm_agp_backend *agp_be;
136
137 agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
138 if (!agp_be)
139 return NULL;
140
141 agp_be->mem = NULL;
142 agp_be->bridge = bridge;
143 agp_be->backend.func = &ttm_agp_func;
144 agp_be->backend.bdev = bdev;
145 return &agp_be->backend;
146}
147EXPORT_SYMBOL(ttm_agp_backend_init);
148
149#endif