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_device.h>
36 #include <drm/ttm/ttm_tt.h>
37 #include <drm/ttm/ttm_resource.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
ttm_agp_bind(struct ttm_tt * ttm,struct ttm_resource * bo_mem)50 int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *bo_mem)
51 {
52 STUB();
53 return -ENOSYS;
54 #ifdef notyet
55 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
56 struct vm_page *dummy_read_page = ttm_glob.dummy_read_page;
57 struct agp_memory *mem;
58 int ret, cached = ttm->caching == ttm_cached;
59 unsigned i;
60
61 if (agp_be->mem)
62 return 0;
63
64 mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
65 if (unlikely(mem == NULL))
66 return -ENOMEM;
67
68 mem->page_count = 0;
69 for (i = 0; i < ttm->num_pages; i++) {
70 struct vm_page *page = ttm->pages[i];
71
72 if (!page)
73 page = dummy_read_page;
74
75 mem->pages[mem->page_count++] = page;
76 }
77 agp_be->mem = mem;
78
79 mem->is_flushed = 1;
80 mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
81
82 ret = agp_bind_memory(mem, bo_mem->start);
83 if (ret)
84 pr_err("AGP Bind memory failed\n");
85
86 return ret;
87 #endif
88 }
89 EXPORT_SYMBOL(ttm_agp_bind);
90
ttm_agp_unbind(struct ttm_tt * ttm)91 void ttm_agp_unbind(struct ttm_tt *ttm)
92 {
93 STUB();
94 #ifdef notyet
95 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
96
97 if (agp_be->mem) {
98 if (agp_be->mem->is_bound) {
99 agp_unbind_memory(agp_be->mem);
100 return;
101 }
102 agp_free_memory(agp_be->mem);
103 agp_be->mem = NULL;
104 }
105 #endif
106 }
107 EXPORT_SYMBOL(ttm_agp_unbind);
108
ttm_agp_is_bound(struct ttm_tt * ttm)109 bool ttm_agp_is_bound(struct ttm_tt *ttm)
110 {
111 STUB();
112 return false;
113 #ifdef notyet
114 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
115
116 if (!ttm)
117 return false;
118
119 return (agp_be->bound == 1);
120 #endif
121 }
122 EXPORT_SYMBOL(ttm_agp_is_bound);
123
ttm_agp_destroy(struct ttm_tt * ttm)124 void ttm_agp_destroy(struct ttm_tt *ttm)
125 {
126 STUB();
127 #ifdef notyet
128 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
129
130 if (agp_be->bound)
131 ttm_agp_unbind(ttm);
132 ttm_tt_fini(ttm);
133 kfree(agp_be);
134 #endif
135 }
136 EXPORT_SYMBOL(ttm_agp_destroy);
137
ttm_agp_tt_create(struct ttm_buffer_object * bo,struct agp_bridge_data * bridge,uint32_t page_flags)138 struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
139 struct agp_bridge_data *bridge,
140 uint32_t page_flags)
141 {
142 struct ttm_agp_backend *agp_be;
143
144 agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
145 if (!agp_be)
146 return NULL;
147
148 agp_be->mem = NULL;
149 agp_be->bridge = bridge;
150
151 if (ttm_tt_init(&agp_be->ttm, bo, page_flags, ttm_write_combined, 0)) {
152 kfree(agp_be);
153 return NULL;
154 }
155
156 return &agp_be->ttm;
157 }
158 EXPORT_SYMBOL(ttm_agp_tt_create);
159