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/slab.h>
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
ttm_agp_populate(struct ttm_backend * backend,unsigned long num_pages,struct page ** pages,struct page * dummy_read_page,dma_addr_t * dma_addrs)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 dma_addr_t *dma_addrs)
52 {
53 struct ttm_agp_backend *agp_be =
54 container_of(backend, struct ttm_agp_backend, backend);
55 struct page **cur_page, **last_page = pages + num_pages;
56 struct agp_memory *mem;
57
58 mem = agp_allocate_memory(agp_be->bridge, num_pages, AGP_USER_MEMORY);
59 if (unlikely(mem == NULL))
60 return -ENOMEM;
61
62 mem->page_count = 0;
63 for (cur_page = pages; cur_page < last_page; ++cur_page) {
64 struct page *page = *cur_page;
65 if (!page)
66 page = dummy_read_page;
67
68 mem->pages[mem->page_count++] = page;
69 }
70 agp_be->mem = mem;
71 return 0;
72 }
73
ttm_agp_bind(struct ttm_backend * backend,struct ttm_mem_reg * bo_mem)74 static int ttm_agp_bind(struct ttm_backend *backend, struct ttm_mem_reg *bo_mem)
75 {
76 struct ttm_agp_backend *agp_be =
77 container_of(backend, struct ttm_agp_backend, backend);
78 struct drm_mm_node *node = bo_mem->mm_node;
79 struct agp_memory *mem = agp_be->mem;
80 int cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
81 int ret;
82
83 mem->is_flushed = 1;
84 mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
85
86 ret = agp_bind_memory(mem, node->start);
87 if (ret)
88 printk(KERN_ERR TTM_PFX "AGP Bind memory failed.\n");
89
90 return ret;
91 }
92
ttm_agp_unbind(struct ttm_backend * backend)93 static int ttm_agp_unbind(struct ttm_backend *backend)
94 {
95 struct ttm_agp_backend *agp_be =
96 container_of(backend, struct ttm_agp_backend, backend);
97
98 if (agp_be->mem->is_bound)
99 return agp_unbind_memory(agp_be->mem);
100 else
101 return 0;
102 }
103
ttm_agp_clear(struct ttm_backend * backend)104 static void ttm_agp_clear(struct ttm_backend *backend)
105 {
106 struct ttm_agp_backend *agp_be =
107 container_of(backend, struct ttm_agp_backend, backend);
108 struct agp_memory *mem = agp_be->mem;
109
110 if (mem) {
111 ttm_agp_unbind(backend);
112 agp_free_memory(mem);
113 }
114 agp_be->mem = NULL;
115 }
116
ttm_agp_destroy(struct ttm_backend * backend)117 static void ttm_agp_destroy(struct ttm_backend *backend)
118 {
119 struct ttm_agp_backend *agp_be =
120 container_of(backend, struct ttm_agp_backend, backend);
121
122 if (agp_be->mem)
123 ttm_agp_clear(backend);
124 kfree(agp_be);
125 }
126
127 static struct ttm_backend_func ttm_agp_func = {
128 .populate = ttm_agp_populate,
129 .clear = ttm_agp_clear,
130 .bind = ttm_agp_bind,
131 .unbind = ttm_agp_unbind,
132 .destroy = ttm_agp_destroy,
133 };
134
ttm_agp_backend_init(struct ttm_bo_device * bdev,struct agp_bridge_data * bridge)135 struct ttm_backend *ttm_agp_backend_init(struct ttm_bo_device *bdev,
136 struct agp_bridge_data *bridge)
137 {
138 struct ttm_agp_backend *agp_be;
139
140 agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
141 if (!agp_be)
142 return NULL;
143
144 agp_be->mem = NULL;
145 agp_be->bridge = bridge;
146 agp_be->backend.func = &ttm_agp_func;
147 agp_be->backend.bdev = bdev;
148 return &agp_be->backend;
149 }
150 EXPORT_SYMBOL(ttm_agp_backend_init);
151
152 #endif
153