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/export.h>
40#include <linux/module.h>
41#include <linux/slab.h>
42#include <linux/io.h>
43#include <asm/agp.h>
44
45struct ttm_agp_backend {
46 struct ttm_tt ttm;
47 struct agp_memory *mem;
48 struct agp_bridge_data *bridge;
49};
50
51int 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_glob.dummy_read_page;
55 struct agp_memory *mem;
56 int ret, cached = ttm->caching == ttm_cached;
57 unsigned i;
58
59 if (agp_be->mem)
60 return 0;
61
62 mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
63 if (unlikely(mem == NULL))
64 return -ENOMEM;
65
66 mem->page_count = 0;
67 for (i = 0; i < ttm->num_pages; i++) {
68 struct page *page = ttm->pages[i];
69
70 if (!page)
71 page = dummy_read_page;
72
73 mem->pages[mem->page_count++] = page;
74 }
75 agp_be->mem = mem;
76
77 mem->is_flushed = 1;
78 mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
79
80 ret = agp_bind_memory(mem, bo_mem->start);
81 if (ret)
82 pr_err("AGP Bind memory failed\n");
83
84 return ret;
85}
86EXPORT_SYMBOL(ttm_agp_bind);
87
88void ttm_agp_unbind(struct ttm_tt *ttm)
89{
90 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
91
92 if (agp_be->mem) {
93 if (agp_be->mem->is_bound) {
94 agp_unbind_memory(agp_be->mem);
95 return;
96 }
97 agp_free_memory(agp_be->mem);
98 agp_be->mem = NULL;
99 }
100}
101EXPORT_SYMBOL(ttm_agp_unbind);
102
103bool ttm_agp_is_bound(struct ttm_tt *ttm)
104{
105 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
106
107 if (!ttm)
108 return false;
109
110 return (agp_be->mem != NULL);
111}
112EXPORT_SYMBOL(ttm_agp_is_bound);
113
114void ttm_agp_destroy(struct ttm_tt *ttm)
115{
116 struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
117
118 if (agp_be->mem)
119 ttm_agp_unbind(ttm);
120 ttm_tt_fini(ttm);
121 kfree(objp: agp_be);
122}
123EXPORT_SYMBOL(ttm_agp_destroy);
124
125struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
126 struct agp_bridge_data *bridge,
127 uint32_t page_flags)
128{
129 struct ttm_agp_backend *agp_be;
130
131 agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
132 if (!agp_be)
133 return NULL;
134
135 agp_be->mem = NULL;
136 agp_be->bridge = bridge;
137
138 if (ttm_tt_init(ttm: &agp_be->ttm, bo, page_flags, caching: ttm_write_combined, extra_pages: 0)) {
139 kfree(objp: agp_be);
140 return NULL;
141 }
142
143 return &agp_be->ttm;
144}
145EXPORT_SYMBOL(ttm_agp_tt_create);
146