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
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_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}
87EXPORT_SYMBOL(ttm_agp_bind);
88
89void 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}
102EXPORT_SYMBOL(ttm_agp_unbind);
103
104bool 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}
113EXPORT_SYMBOL(ttm_agp_is_bound);
114
115void 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}
124EXPORT_SYMBOL(ttm_agp_destroy);
125
126struct 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}
146EXPORT_SYMBOL(ttm_agp_tt_create);
147