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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
/*
* Copyright 2011 Red Hat Inc.
*
* 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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: Dave Airlie
*/
#include <linux/dma-buf.h>
#include <drm/drmP.h>
#include "nouveau_drm.h"
#include "nouveau_gem.h"
static struct sg_table *nouveau_gem_map_dma_buf(struct dma_buf_attachment *attachment,
enum dma_data_direction dir)
{
struct nouveau_bo *nvbo = attachment->dmabuf->priv;
struct drm_device *dev = nvbo->gem->dev;
int npages = nvbo->bo.num_pages;
struct sg_table *sg;
int nents;
mutex_lock(&dev->struct_mutex);
sg = drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages);
nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir);
mutex_unlock(&dev->struct_mutex);
return sg;
}
static void nouveau_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
struct sg_table *sg, enum dma_data_direction dir)
{
dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
sg_free_table(sg);
kfree(sg);
}
static void nouveau_gem_dmabuf_release(struct dma_buf *dma_buf)
{
struct nouveau_bo *nvbo = dma_buf->priv;
if (nvbo->gem->export_dma_buf == dma_buf) {
nvbo->gem->export_dma_buf = NULL;
drm_gem_object_unreference_unlocked(nvbo->gem);
}
}
static void *nouveau_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num)
{
return NULL;
}
static void nouveau_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
{
}
static void *nouveau_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num)
{
return NULL;
}
static void nouveau_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
{
}
static int nouveau_gem_prime_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
{
return -EINVAL;
}
static void *nouveau_gem_prime_vmap(struct dma_buf *dma_buf)
{
struct nouveau_bo *nvbo = dma_buf->priv;
struct drm_device *dev = nvbo->gem->dev;
int ret;
mutex_lock(&dev->struct_mutex);
if (nvbo->vmapping_count) {
nvbo->vmapping_count++;
goto out_unlock;
}
ret = ttm_bo_kmap(&nvbo->bo, 0, nvbo->bo.num_pages,
&nvbo->dma_buf_vmap);
if (ret) {
mutex_unlock(&dev->struct_mutex);
return ERR_PTR(ret);
}
nvbo->vmapping_count = 1;
out_unlock:
mutex_unlock(&dev->struct_mutex);
return nvbo->dma_buf_vmap.virtual;
}
static void nouveau_gem_prime_vunmap(struct dma_buf *dma_buf, void *vaddr)
{
struct nouveau_bo *nvbo = dma_buf->priv;
struct drm_device *dev = nvbo->gem->dev;
mutex_lock(&dev->struct_mutex);
nvbo->vmapping_count--;
if (nvbo->vmapping_count == 0) {
ttm_bo_kunmap(&nvbo->dma_buf_vmap);
}
mutex_unlock(&dev->struct_mutex);
}
static const struct dma_buf_ops nouveau_dmabuf_ops = {
.map_dma_buf = nouveau_gem_map_dma_buf,
.unmap_dma_buf = nouveau_gem_unmap_dma_buf,
.release = nouveau_gem_dmabuf_release,
.kmap = nouveau_gem_kmap,
.kmap_atomic = nouveau_gem_kmap_atomic,
.kunmap = nouveau_gem_kunmap,
.kunmap_atomic = nouveau_gem_kunmap_atomic,
.mmap = nouveau_gem_prime_mmap,
.vmap = nouveau_gem_prime_vmap,
.vunmap = nouveau_gem_prime_vunmap,
};
static int
nouveau_prime_new(struct drm_device *dev,
size_t size,
struct sg_table *sg,
struct nouveau_bo **pnvbo)
{
struct nouveau_bo *nvbo;
u32 flags = 0;
int ret;
flags = TTM_PL_FLAG_TT;
ret = nouveau_bo_new(dev, size, 0, flags, 0, 0,
sg, pnvbo);
if (ret)
return ret;
nvbo = *pnvbo;
nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART;
nvbo->gem = drm_gem_object_alloc(dev, nvbo->bo.mem.size);
if (!nvbo->gem) {
nouveau_bo_ref(NULL, pnvbo);
return -ENOMEM;
}
nvbo->gem->driver_private = nvbo;
return 0;
}
struct dma_buf *nouveau_gem_prime_export(struct drm_device *dev,
struct drm_gem_object *obj, int flags)
{
struct nouveau_bo *nvbo = nouveau_gem_object(obj);
int ret = 0;
/* pin buffer into GTT */
ret = nouveau_bo_pin(nvbo, TTM_PL_FLAG_TT);
if (ret)
return ERR_PTR(-EINVAL);
return dma_buf_export(nvbo, &nouveau_dmabuf_ops, obj->size, flags);
}
struct drm_gem_object *nouveau_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf)
{
struct dma_buf_attachment *attach;
struct sg_table *sg;
struct nouveau_bo *nvbo;
int ret;
if (dma_buf->ops == &nouveau_dmabuf_ops) {
nvbo = dma_buf->priv;
if (nvbo->gem) {
if (nvbo->gem->dev == dev) {
drm_gem_object_reference(nvbo->gem);
dma_buf_put(dma_buf);
return nvbo->gem;
}
}
}
/* need to attach */
attach = dma_buf_attach(dma_buf, dev->dev);
if (IS_ERR(attach))
return ERR_PTR(PTR_ERR(attach));
sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
if (IS_ERR(sg)) {
ret = PTR_ERR(sg);
goto fail_detach;
}
ret = nouveau_prime_new(dev, dma_buf->size, sg, &nvbo);
if (ret)
goto fail_unmap;
nvbo->gem->import_attach = attach;
return nvbo->gem;
fail_unmap:
dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL);
fail_detach:
dma_buf_detach(dma_buf, attach);
return ERR_PTR(ret);
}
|
