summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/ttm/ttm_agp_backend.c
blob: f999e36f30b4c184fd5d04aa2f34bf085eba89ab (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/**************************************************************************
 *
 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/
/*
 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
 *          Keith Packard.
 */

#include "ttm/ttm_module.h"
#include "ttm/ttm_bo_driver.h"
#ifdef TTM_HAS_AGP
#include "ttm/ttm_placement.h"
#include <linux/agp_backend.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <asm/agp.h>

struct ttm_agp_backend {
	struct ttm_backend backend;
	struct agp_memory *mem;
	struct agp_bridge_data *bridge;
};

static int ttm_agp_populate(struct ttm_backend *backend,
			    unsigned long num_pages, struct page **pages,
			    struct page *dummy_read_page)
{
	struct ttm_agp_backend *agp_be =
	    container_of(backend, struct ttm_agp_backend, backend);
	struct page **cur_page, **last_page = pages + num_pages;
	struct agp_memory *mem;

	mem = agp_allocate_memory(agp_be->bridge, num_pages, AGP_USER_MEMORY);
	if (unlikely(mem == NULL))
		return -ENOMEM;

	mem->page_count = 0;
	for (cur_page = pages; cur_page < last_page; ++cur_page) {
		struct page *page = *cur_page;
		if (!page)
			page = dummy_read_page;

		mem->pages[mem->page_count++] = page;
	}
	agp_be->mem = mem;
	return 0;
}

static int ttm_agp_bind(struct ttm_backend *backend, struct ttm_mem_reg *bo_mem)
{
	struct ttm_agp_backend *agp_be =
	    container_of(backend, struct ttm_agp_backend, backend);
	struct drm_mm_node *node = bo_mem->mm_node;
	struct agp_memory *mem = agp_be->mem;
	int cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
	int ret;

	mem->is_flushed = 1;
	mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;

	ret = agp_bind_memory(mem, node->start);
	if (ret)
		printk(KERN_ERR TTM_PFX "AGP Bind memory failed.\n");

	return ret;
}

static int ttm_agp_unbind(struct ttm_backend *backend)
{
	struct ttm_agp_backend *agp_be =
	    container_of(backend, struct ttm_agp_backend, backend);

	if (agp_be->mem->is_bound)
		return agp_unbind_memory(agp_be->mem);
	else
		return 0;
}

static void ttm_agp_clear(struct ttm_backend *backend)
{
	struct ttm_agp_backend *agp_be =
	    container_of(backend, struct ttm_agp_backend, backend);
	struct agp_memory *mem = agp_be->mem;

	if (mem) {
		ttm_agp_unbind(backend);
		agp_free_memory(mem);
	}
	agp_be->mem = NULL;
}

static void ttm_agp_destroy(struct ttm_backend *backend)
{
	struct ttm_agp_backend *agp_be =
	    container_of(backend, struct ttm_agp_backend, backend);

	if (agp_be->mem)
		ttm_agp_clear(backend);
	kfree(agp_be);
}

static struct ttm_backend_func ttm_agp_func = {
	.populate = ttm_agp_populate,
	.clear = ttm_agp_clear,
	.bind = ttm_agp_bind,
	.unbind = ttm_agp_unbind,
	.destroy = ttm_agp_destroy,
};

struct ttm_backend *ttm_agp_backend_init(struct ttm_bo_device *bdev,
					 struct agp_bridge_data *bridge)
{
	struct ttm_agp_backend *agp_be;

	agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
	if (!agp_be)
		return NULL;

	agp_be->mem = NULL;
	agp_be->bridge = bridge;
	agp_be->backend.func = &ttm_agp_func;
	agp_be->backend.bdev = bdev;
	return &agp_be->backend;
}
EXPORT_SYMBOL(ttm_agp_backend_init);

#endif