1/**************************************************************************
2 *
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27/*
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29 *          Keith Packard.
30 */
31
32#define pr_fmt(fmt) "[TTM] " fmt
33
34#include <drm/ttm/ttm_module.h>
35#include <drm/ttm/ttm_bo_driver.h>
36#include <drm/ttm/ttm_page_alloc.h>
37#ifdef TTM_HAS_AGP
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
51static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
52{
53	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
54	struct drm_mm_node *node = bo_mem->mm_node;
55	struct agp_memory *mem;
56	int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
57	unsigned i;
58
59	mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
60	if (unlikely(mem == NULL))
61		return -ENOMEM;
62
63	mem->page_count = 0;
64	for (i = 0; i < ttm->num_pages; i++) {
65		struct page *page = ttm->pages[i];
66
67		if (!page)
68			page = ttm->dummy_read_page;
69
70		mem->pages[mem->page_count++] = page;
71	}
72	agp_be->mem = mem;
73
74	mem->is_flushed = 1;
75	mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
76
77	ret = agp_bind_memory(mem, node->start);
78	if (ret)
79		pr_err("AGP Bind memory failed\n");
80
81	return ret;
82}
83
84static int ttm_agp_unbind(struct ttm_tt *ttm)
85{
86	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
87
88	if (agp_be->mem) {
89		if (agp_be->mem->is_bound)
90			return agp_unbind_memory(agp_be->mem);
91		agp_free_memory(agp_be->mem);
92		agp_be->mem = NULL;
93	}
94	return 0;
95}
96
97static void ttm_agp_destroy(struct ttm_tt *ttm)
98{
99	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
100
101	if (agp_be->mem)
102		ttm_agp_unbind(ttm);
103	ttm_tt_fini(ttm);
104	kfree(agp_be);
105}
106
107static struct ttm_backend_func ttm_agp_func = {
108	.bind = ttm_agp_bind,
109	.unbind = ttm_agp_unbind,
110	.destroy = ttm_agp_destroy,
111};
112
113struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
114				 struct agp_bridge_data *bridge,
115				 unsigned long size, uint32_t page_flags,
116				 struct page *dummy_read_page)
117{
118	struct ttm_agp_backend *agp_be;
119
120	agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
121	if (!agp_be)
122		return NULL;
123
124	agp_be->mem = NULL;
125	agp_be->bridge = bridge;
126	agp_be->ttm.func = &ttm_agp_func;
127
128	if (ttm_tt_init(&agp_be->ttm, bdev, size, page_flags, dummy_read_page)) {
129		kfree(agp_be);
130		return NULL;
131	}
132
133	return &agp_be->ttm;
134}
135EXPORT_SYMBOL(ttm_agp_tt_create);
136
137int ttm_agp_tt_populate(struct ttm_tt *ttm)
138{
139	if (ttm->state != tt_unpopulated)
140		return 0;
141
142	return ttm_pool_populate(ttm);
143}
144EXPORT_SYMBOL(ttm_agp_tt_populate);
145
146void ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
147{
148	ttm_pool_unpopulate(ttm);
149}
150EXPORT_SYMBOL(ttm_agp_tt_unpopulate);
151
152#endif
153