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