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 #include "ttm/ttm_page_alloc.h"
35 #ifdef TTM_HAS_AGP
36 #include "ttm/ttm_placement.h"
37 #include <linux/agp_backend.h>
38 #include <linux/module.h>
39 #include <linux/slab.h>
40 #include <linux/io.h>
41 #include <asm/agp.h>
42 
43 struct ttm_agp_backend {
44 	struct ttm_tt ttm;
45 	struct agp_memory *mem;
46 	struct agp_bridge_data *bridge;
47 };
48 
49 static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
50 {
51 	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
52 	struct drm_mm_node *node = bo_mem->mm_node;
53 	struct agp_memory *mem;
54 	int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
55 	unsigned i;
56 
57 	mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
58 	if (unlikely(mem == NULL))
59 		return -ENOMEM;
60 
61 	mem->page_count = 0;
62 	for (i = 0; i < ttm->num_pages; i++) {
63 		struct page *page = ttm->pages[i];
64 
65 		if (!page)
66 			page = ttm->dummy_read_page;
67 
68 		mem->pages[mem->page_count++] = page;
69 	}
70 	agp_be->mem = mem;
71 
72 	mem->is_flushed = 1;
73 	mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
74 
75 	ret = agp_bind_memory(mem, node->start);
76 	if (ret)
77 		printk(KERN_ERR TTM_PFX "AGP Bind memory failed.\n");
78 
79 	return ret;
80 }
81 
82 static int ttm_agp_unbind(struct ttm_tt *ttm)
83 {
84 	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
85 
86 	if (agp_be->mem) {
87 		if (agp_be->mem->is_bound)
88 			return agp_unbind_memory(agp_be->mem);
89 		agp_free_memory(agp_be->mem);
90 		agp_be->mem = NULL;
91 	}
92 	return 0;
93 }
94 
95 static void ttm_agp_destroy(struct ttm_tt *ttm)
96 {
97 	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
98 
99 	if (agp_be->mem)
100 		ttm_agp_unbind(ttm);
101 	ttm_tt_fini(ttm);
102 	kfree(agp_be);
103 }
104 
105 static struct ttm_backend_func ttm_agp_func = {
106 	.bind = ttm_agp_bind,
107 	.unbind = ttm_agp_unbind,
108 	.destroy = ttm_agp_destroy,
109 };
110 
111 struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
112 				 struct agp_bridge_data *bridge,
113 				 unsigned long size, uint32_t page_flags,
114 				 struct page *dummy_read_page)
115 {
116 	struct ttm_agp_backend *agp_be;
117 
118 	agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
119 	if (!agp_be)
120 		return NULL;
121 
122 	agp_be->mem = NULL;
123 	agp_be->bridge = bridge;
124 	agp_be->ttm.func = &ttm_agp_func;
125 
126 	if (ttm_tt_init(&agp_be->ttm, bdev, size, page_flags, dummy_read_page)) {
127 		return NULL;
128 	}
129 
130 	return &agp_be->ttm;
131 }
132 EXPORT_SYMBOL(ttm_agp_tt_create);
133 
134 int ttm_agp_tt_populate(struct ttm_tt *ttm)
135 {
136 	if (ttm->state != tt_unpopulated)
137 		return 0;
138 
139 	return ttm_pool_populate(ttm);
140 }
141 EXPORT_SYMBOL(ttm_agp_tt_populate);
142 
143 void ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
144 {
145 	ttm_pool_unpopulate(ttm);
146 }
147 EXPORT_SYMBOL(ttm_agp_tt_unpopulate);
148 
149 #endif
150