1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
2 /**************************************************************************
3 *
4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
25 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28 /*
29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
30 * Keith Packard.
31 */
32
33 #define pr_fmt(fmt) "[TTM] " fmt
34
35 #include <drm/ttm/ttm_module.h>
36 #include <drm/ttm/ttm_bo_driver.h>
37 #include <drm/ttm/ttm_page_alloc.h>
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
ttm_agp_bind(struct ttm_tt * ttm,struct ttm_resource * bo_mem)51 int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *bo_mem)
52 {
53 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
54 struct page *dummy_read_page = ttm_bo_glob.dummy_read_page;
55 struct drm_mm_node *node = bo_mem->mm_node;
56 struct agp_memory *mem;
57 int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
58 unsigned i;
59
60 if (agp_be->mem)
61 return 0;
62
63 mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
64 if (unlikely(mem == NULL))
65 return -ENOMEM;
66
67 mem->page_count = 0;
68 for (i = 0; i < ttm->num_pages; i++) {
69 struct page *page = ttm->pages[i];
70
71 if (!page)
72 page = dummy_read_page;
73
74 mem->pages[mem->page_count++] = page;
75 }
76 agp_be->mem = mem;
77
78 mem->is_flushed = 1;
79 mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
80
81 ret = agp_bind_memory(mem, node->start);
82 if (ret)
83 pr_err("AGP Bind memory failed\n");
84
85 return ret;
86 }
87 EXPORT_SYMBOL(ttm_agp_bind);
88
ttm_agp_unbind(struct ttm_tt * ttm)89 void ttm_agp_unbind(struct ttm_tt *ttm)
90 {
91 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
92
93 if (agp_be->mem) {
94 if (agp_be->mem->is_bound) {
95 agp_unbind_memory(agp_be->mem);
96 return;
97 }
98 agp_free_memory(agp_be->mem);
99 agp_be->mem = NULL;
100 }
101 }
102 EXPORT_SYMBOL(ttm_agp_unbind);
103
ttm_agp_is_bound(struct ttm_tt * ttm)104 bool ttm_agp_is_bound(struct ttm_tt *ttm)
105 {
106 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
107
108 if (!ttm)
109 return false;
110
111 return (agp_be->mem != NULL);
112 }
113 EXPORT_SYMBOL(ttm_agp_is_bound);
114
ttm_agp_destroy(struct ttm_tt * ttm)115 void ttm_agp_destroy(struct ttm_tt *ttm)
116 {
117 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
118
119 if (agp_be->mem)
120 ttm_agp_unbind(ttm);
121 ttm_tt_fini(ttm);
122 kfree(agp_be);
123 }
124 EXPORT_SYMBOL(ttm_agp_destroy);
125
ttm_agp_tt_create(struct ttm_buffer_object * bo,struct agp_bridge_data * bridge,uint32_t page_flags)126 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
127 struct agp_bridge_data *bridge,
128 uint32_t page_flags)
129 {
130 struct ttm_agp_backend *agp_be;
131
132 agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
133 if (!agp_be)
134 return NULL;
135
136 agp_be->mem = NULL;
137 agp_be->bridge = bridge;
138
139 if (ttm_tt_init(&agp_be->ttm, bo, page_flags)) {
140 kfree(agp_be);
141 return NULL;
142 }
143
144 return &agp_be->ttm;
145 }
146 EXPORT_SYMBOL(ttm_agp_tt_create);
147
