1/* $NetBSD: ttm_agp_backend.c,v 1.5 2015/10/17 21:05:57 jmcneill Exp $ */
2
3/*-
4 * Copyright (c) 2014 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: ttm_agp_backend.c,v 1.5 2015/10/17 21:05:57 jmcneill Exp $");
34
35#include <sys/types.h>
36#include <sys/kmem.h>
37
38#include <dev/pci/pcireg.h>
39#include <dev/pci/pcivar.h>
40#include <dev/pci/agpvar.h>
41
42#include <ttm/ttm_bo_driver.h>
43#include <ttm/ttm_page_alloc.h>
44
45#if __OS_HAS_AGP
46
47struct ttm_agp {
48 struct ttm_dma_tt ttm_dma;
49 struct agp_softc *agp;
50 unsigned long agp_pgno;
51 bool bound;
52};
53
54static const struct ttm_backend_func ttm_agp_backend_func;
55
56struct ttm_tt *
57ttm_agp_tt_create(struct ttm_bo_device *bdev, struct agp_bridge_data *bridge,
58 unsigned long size, uint32_t page_flags, struct page *dummy_read_page)
59{
60 struct ttm_agp *ttm_agp;
61
62 ttm_agp = kmem_zalloc(sizeof(*ttm_agp), KM_SLEEP);
63 ttm_agp->agp = &bridge->abd_sc;
64 ttm_agp->ttm_dma.ttm.func = &ttm_agp_backend_func;
65
66 if (ttm_dma_tt_init(&ttm_agp->ttm_dma, bdev, size, page_flags,
67 dummy_read_page) != 0)
68 goto fail;
69
70 /* Success! */
71 return &ttm_agp->ttm_dma.ttm;
72
73fail: kmem_free(ttm_agp, sizeof(*ttm_agp));
74 return NULL;
75}
76
77int
78ttm_agp_tt_populate(struct ttm_tt *ttm)
79{
80
81 if (ttm->state != tt_unpopulated)
82 return 0;
83
84 return ttm_bus_dma_populate(container_of(ttm, struct ttm_dma_tt, ttm));
85}
86
87void
88ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
89{
90
91 ttm_bus_dma_unpopulate(container_of(ttm, struct ttm_dma_tt, ttm));
92}
93
94static int
95ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
96{
97 struct ttm_agp *const ttm_agp = container_of(ttm, struct ttm_agp,
98 ttm_dma.ttm);
99 struct agp_softc *const sc = ttm_agp->agp;
100 struct drm_mm_node *const node = bo_mem->mm_node;
101 const unsigned long agp_pgno = node->start;
102 unsigned i, j;
103 int ret;
104
105 KASSERT(!ttm_agp->bound);
106 KASSERT(ttm_agp->ttm_dma.dma_address->dm_nsegs == ttm->num_pages);
107 for (i = 0; i < ttm->num_pages; i++) {
108 KASSERT(ttm_agp->ttm_dma.dma_address->dm_segs[i].ds_len ==
109 AGP_PAGE_SIZE);
110 /* XXX errno NetBSD->Linux */
111 ret = -AGP_BIND_PAGE(sc, (agp_pgno + i) << AGP_PAGE_SHIFT,
112 ttm_agp->ttm_dma.dma_address->dm_segs[i].ds_len);
113 if (ret)
114 goto fail;
115 }
116 agp_flush_cache();
117 AGP_FLUSH_TLB(sc);
118
119 /* Success! */
120 ttm_agp->agp_pgno = agp_pgno;
121 ttm_agp->bound = true;
122 return 0;
123
124fail: KASSERT(ret);
125 for (j = 0; j < i; j++)
126 (void)AGP_UNBIND_PAGE(sc, (agp_pgno + j) << AGP_PAGE_SHIFT);
127 return ret;
128}
129
130static int
131ttm_agp_unbind(struct ttm_tt *ttm)
132{
133 struct ttm_agp *const ttm_agp = container_of(ttm, struct ttm_agp,
134 ttm_dma.ttm);
135 struct agp_softc *const sc = ttm_agp->agp;
136 const unsigned long agp_pgno = ttm_agp->agp_pgno;
137 unsigned i;
138
139 /* XXX Can this happen? */
140 if (!ttm_agp->bound)
141 return 0;
142
143 for (i = 0; i < ttm->num_pages; i++)
144 (void)AGP_UNBIND_PAGE(sc, (agp_pgno + i) << AGP_PAGE_SHIFT);
145
146 ttm_agp->agp_pgno = 0;
147 ttm_agp->bound = false;
148 return 0;
149}
150
151static void
152ttm_agp_destroy(struct ttm_tt *ttm)
153{
154 struct ttm_agp *const ttm_agp = container_of(ttm, struct ttm_agp,
155 ttm_dma.ttm);
156
157 /* XXX Can this happen? */
158 if (ttm_agp->bound)
159 ttm_agp_unbind(ttm);
160 ttm_tt_fini(ttm);
161 kmem_free(ttm_agp, sizeof(*ttm_agp));
162}
163
164static const struct ttm_backend_func ttm_agp_backend_func = {
165 .bind = &ttm_agp_bind,
166 .unbind = &ttm_agp_unbind,
167 .destroy = &ttm_agp_destroy,
168};
169
170#endif
171