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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
/*
* Copyright © 2016 Intel Corporation
*
* 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, sublicense,
* 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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*
*/
#include "mock_dmabuf.h"
static struct sg_table *mock_map_dma_buf(struct dma_buf_attachment *attachment,
enum dma_data_direction dir)
{
struct mock_dmabuf *mock = to_mock(attachment->dmabuf);
struct sg_table *st;
struct scatterlist *sg;
int i, err;
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (!st)
return ERR_PTR(-ENOMEM);
err = sg_alloc_table(st, mock->npages, GFP_KERNEL);
if (err)
goto err_free;
sg = st->sgl;
for (i = 0; i < mock->npages; i++) {
sg_set_page(sg, mock->pages[i], PAGE_SIZE, 0);
sg = sg_next(sg);
}
if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) {
err = -ENOMEM;
goto err_st;
}
return st;
err_st:
sg_free_table(st);
err_free:
kfree(st);
return ERR_PTR(err);
}
static void mock_unmap_dma_buf(struct dma_buf_attachment *attachment,
struct sg_table *st,
enum dma_data_direction dir)
{
dma_unmap_sg(attachment->dev, st->sgl, st->nents, dir);
sg_free_table(st);
kfree(st);
}
static void mock_dmabuf_release(struct dma_buf *dma_buf)
{
struct mock_dmabuf *mock = to_mock(dma_buf);
int i;
for (i = 0; i < mock->npages; i++)
put_page(mock->pages[i]);
kfree(mock);
}
static void *mock_dmabuf_vmap(struct dma_buf *dma_buf)
{
struct mock_dmabuf *mock = to_mock(dma_buf);
return vm_map_ram(mock->pages, mock->npages, 0, PAGE_KERNEL);
}
static void mock_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
{
struct mock_dmabuf *mock = to_mock(dma_buf);
vm_unmap_ram(vaddr, mock->npages);
}
static void *mock_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
{
struct mock_dmabuf *mock = to_mock(dma_buf);
return kmap_atomic(mock->pages[page_num]);
}
static void mock_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
{
kunmap_atomic(addr);
}
static void *mock_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num)
{
struct mock_dmabuf *mock = to_mock(dma_buf);
return kmap(mock->pages[page_num]);
}
static void mock_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
{
struct mock_dmabuf *mock = to_mock(dma_buf);
return kunmap(mock->pages[page_num]);
}
static int mock_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
{
return -ENODEV;
}
static const struct dma_buf_ops mock_dmabuf_ops = {
.map_dma_buf = mock_map_dma_buf,
.unmap_dma_buf = mock_unmap_dma_buf,
.release = mock_dmabuf_release,
.kmap = mock_dmabuf_kmap,
.kmap_atomic = mock_dmabuf_kmap_atomic,
.kunmap = mock_dmabuf_kunmap,
.kunmap_atomic = mock_dmabuf_kunmap_atomic,
.mmap = mock_dmabuf_mmap,
.vmap = mock_dmabuf_vmap,
.vunmap = mock_dmabuf_vunmap,
};
static struct dma_buf *mock_dmabuf(int npages)
{
struct mock_dmabuf *mock;
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
struct dma_buf *dmabuf;
int i;
mock = kmalloc(sizeof(*mock) + npages * sizeof(struct page *),
GFP_KERNEL);
if (!mock)
return ERR_PTR(-ENOMEM);
mock->npages = npages;
for (i = 0; i < npages; i++) {
mock->pages[i] = alloc_page(GFP_KERNEL);
if (!mock->pages[i])
goto err;
}
exp_info.ops = &mock_dmabuf_ops;
exp_info.size = npages * PAGE_SIZE;
exp_info.flags = O_CLOEXEC;
exp_info.priv = mock;
dmabuf = dma_buf_export(&exp_info);
if (IS_ERR(dmabuf))
goto err;
return dmabuf;
err:
while (i--)
put_page(mock->pages[i]);
kfree(mock);
return ERR_PTR(-ENOMEM);
}
|
