ttm_agp_backend.c revision 1.2 
1/*	$NetBSD: ttm_agp_backend.c,v 1.2 2018/08/27 04:58:37 riastradh Exp $	*/
2
3/**************************************************************************
4 *
5 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
6 * All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the
10 * "Software"), to deal in the Software without restriction, including
11 * without limitation the rights to use, copy, modify, merge, publish,
12 * distribute, sub license, and/or sell copies of the Software, and to
13 * permit persons to whom the Software is furnished to do so, subject to
14 * the following conditions:
15 *
16 * The above copyright notice and this permission notice (including the
17 * next paragraph) shall be included in all copies or substantial portions
18 * of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
23 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
24 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
25 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
26 * USE OR OTHER DEALINGS IN THE SOFTWARE.
27 *
28 **************************************************************************/
29/*
30 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
31 *          Keith Packard.
32 */
33
34#include <sys/cdefs.h>
35__KERNEL_RCSID(0, "$NetBSD: ttm_agp_backend.c,v 1.2 2018/08/27 04:58:37 riastradh Exp $");
36
37#define pr_fmt(fmt) "[TTM] " fmt
38
39#include <drm/ttm/ttm_module.h>
40#include <drm/ttm/ttm_bo_driver.h>
41#include <drm/ttm/ttm_page_alloc.h>
42#ifdef TTM_HAS_AGP
43#include <drm/ttm/ttm_placement.h>
44#include <linux/agp_backend.h>
45#include <linux/module.h>
46#include <linux/slab.h>
47#include <linux/io.h>
48#include <asm/agp.h>
49
50struct ttm_agp_backend {
51	struct ttm_tt ttm;
52	struct agp_memory *mem;
53	struct agp_bridge_data *bridge;
54};
55
56static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
57{
58	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
59	struct drm_mm_node *node = bo_mem->mm_node;
60	struct agp_memory *mem;
61	int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
62	unsigned i;
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 page *page = ttm->pages[i];
71
72		if (!page)
73			page = ttm->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, node->start);
83	if (ret)
84		pr_err("AGP Bind memory failed\n");
85
86	return ret;
87}
88
89static int 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			return agp_unbind_memory(agp_be->mem);
96		agp_free_memory(agp_be->mem);
97		agp_be->mem = NULL;
98	}
99	return 0;
100}
101
102static void ttm_agp_destroy(struct ttm_tt *ttm)
103{
104	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
105
106	if (agp_be->mem)
107		ttm_agp_unbind(ttm);
108	ttm_tt_fini(ttm);
109	kfree(agp_be);
110}
111
112static struct ttm_backend_func ttm_agp_func = {
113	.bind = ttm_agp_bind,
114	.unbind = ttm_agp_unbind,
115	.destroy = ttm_agp_destroy,
116};
117
118struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
119				 struct agp_bridge_data *bridge,
120				 unsigned long size, uint32_t page_flags,
121				 struct page *dummy_read_page)
122{
123	struct ttm_agp_backend *agp_be;
124
125	agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
126	if (!agp_be)
127		return NULL;
128
129	agp_be->mem = NULL;
130	agp_be->bridge = bridge;
131	agp_be->ttm.func = &ttm_agp_func;
132
133	if (ttm_tt_init(&agp_be->ttm, bdev, size, page_flags, dummy_read_page)) {
134		kfree(agp_be);
135		return NULL;
136	}
137
138	return &agp_be->ttm;
139}
140EXPORT_SYMBOL(ttm_agp_tt_create);
141
142int ttm_agp_tt_populate(struct ttm_tt *ttm)
143{
144	if (ttm->state != tt_unpopulated)
145		return 0;
146
147	return ttm_pool_populate(ttm);
148}
149EXPORT_SYMBOL(ttm_agp_tt_populate);
150
151void ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
152{
153	ttm_pool_unpopulate(ttm);
154}
155EXPORT_SYMBOL(ttm_agp_tt_unpopulate);
156
157#endif
158