1 /**************************************************************************
2  *
3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
4  * All Rights Reserved.
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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,
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23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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26  **************************************************************************/
27 /*
28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29  *          Keith Packard.
30  */
31 
32 #define pr_fmt(fmt) "[TTM] " fmt
33 
34 #include <drm/ttm/ttm_module.h>
35 #include <drm/ttm/ttm_bo_driver.h>
36 #include <drm/ttm/ttm_page_alloc.h>
37 #ifdef TTM_HAS_AGP
38 #include <drm/ttm/ttm_placement.h>
39 #include <linux/agp_backend.h>
40 #include <linux/module.h>
41 #include <linux/slab.h>
42 #include <linux/io.h>
43 #include <asm/agp.h>
44 
45 struct ttm_agp_backend {
46 	struct ttm_tt ttm;
47 	struct agp_memory *mem;
48 	struct agp_bridge_data *bridge;
49 };
50 
51 static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
52 {
53 	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
54 	struct drm_mm_node *node = bo_mem->mm_node;
55 	struct agp_memory *mem;
56 	int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
57 	unsigned i;
58 
59 	mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
60 	if (unlikely(mem == NULL))
61 		return -ENOMEM;
62 
63 	mem->page_count = 0;
64 	for (i = 0; i < ttm->num_pages; i++) {
65 		struct page *page = ttm->pages[i];
66 
67 		if (!page)
68 			page = ttm->dummy_read_page;
69 
70 		mem->pages[mem->page_count++] = page;
71 	}
72 	agp_be->mem = mem;
73 
74 	mem->is_flushed = 1;
75 	mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
76 
77 	ret = agp_bind_memory(mem, node->start);
78 	if (ret)
79 		pr_err("AGP Bind memory failed\n");
80 
81 	return ret;
82 }
83 
84 static int ttm_agp_unbind(struct ttm_tt *ttm)
85 {
86 	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
87 
88 	if (agp_be->mem) {
89 		if (agp_be->mem->is_bound)
90 			return agp_unbind_memory(agp_be->mem);
91 		agp_free_memory(agp_be->mem);
92 		agp_be->mem = NULL;
93 	}
94 	return 0;
95 }
96 
97 static void ttm_agp_destroy(struct ttm_tt *ttm)
98 {
99 	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
100 
101 	if (agp_be->mem)
102 		ttm_agp_unbind(ttm);
103 	ttm_tt_fini(ttm);
104 	kfree(agp_be);
105 }
106 
107 static struct ttm_backend_func ttm_agp_func = {
108 	.bind = ttm_agp_bind,
109 	.unbind = ttm_agp_unbind,
110 	.destroy = ttm_agp_destroy,
111 };
112 
113 struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
114 				 struct agp_bridge_data *bridge,
115 				 unsigned long size, uint32_t page_flags,
116 				 struct page *dummy_read_page)
117 {
118 	struct ttm_agp_backend *agp_be;
119 
120 	agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
121 	if (!agp_be)
122 		return NULL;
123 
124 	agp_be->mem = NULL;
125 	agp_be->bridge = bridge;
126 	agp_be->ttm.func = &ttm_agp_func;
127 
128 	if (ttm_tt_init(&agp_be->ttm, bdev, size, page_flags, dummy_read_page)) {
129 		return NULL;
130 	}
131 
132 	return &agp_be->ttm;
133 }
134 EXPORT_SYMBOL(ttm_agp_tt_create);
135 
136 int ttm_agp_tt_populate(struct ttm_tt *ttm)
137 {
138 	if (ttm->state != tt_unpopulated)
139 		return 0;
140 
141 	return ttm_pool_populate(ttm);
142 }
143 EXPORT_SYMBOL(ttm_agp_tt_populate);
144 
145 void ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
146 {
147 	ttm_pool_unpopulate(ttm);
148 }
149 EXPORT_SYMBOL(ttm_agp_tt_unpopulate);
150 
151 #endif
152