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
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/*
* Copyright (C) 2012 Red Hat
*
* This file is subject to the terms and conditions of the GNU General Public
* License v2. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <drm/drmP.h>
#include "udl_drv.h"
#include <linux/shmem_fs.h>
#include <linux/dma-buf.h>
struct udl_gem_object *udl_gem_alloc_object(struct drm_device *dev,
size_t size)
{
struct udl_gem_object *obj;
obj = kzalloc(sizeof(*obj), GFP_KERNEL);
if (obj == NULL)
return NULL;
if (drm_gem_object_init(dev, &obj->base, size) != 0) {
kfree(obj);
return NULL;
}
obj->flags = UDL_BO_CACHEABLE;
return obj;
}
static int
udl_gem_create(struct drm_file *file,
struct drm_device *dev,
uint64_t size,
uint32_t *handle_p)
{
struct udl_gem_object *obj;
int ret;
u32 handle;
size = roundup(size, PAGE_SIZE);
obj = udl_gem_alloc_object(dev, size);
if (obj == NULL)
return -ENOMEM;
ret = drm_gem_handle_create(file, &obj->base, &handle);
if (ret) {
drm_gem_object_release(&obj->base);
kfree(obj);
return ret;
}
drm_gem_object_put_unlocked(&obj->base);
*handle_p = handle;
return 0;
}
static void update_vm_cache_attr(struct udl_gem_object *obj,
struct vm_area_struct *vma)
{
DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
/* non-cacheable as default. */
if (obj->flags & UDL_BO_CACHEABLE) {
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
} else if (obj->flags & UDL_BO_WC) {
vma->vm_page_prot =
pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
} else {
vma->vm_page_prot =
pgprot_noncached(vm_get_page_prot(vma->vm_flags));
}
}
int udl_dumb_create(struct drm_file *file,
struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
args->pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
args->size = args->pitch * args->height;
return udl_gem_create(file, dev,
args->size, &args->handle);
}
int udl_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
int ret;
ret = drm_gem_mmap(filp, vma);
if (ret)
return ret;
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_flags |= VM_MIXEDMAP;
update_vm_cache_attr(to_udl_bo(vma->vm_private_data), vma);
return ret;
}
int udl_gem_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct udl_gem_object *obj = to_udl_bo(vma->vm_private_data);
struct page *page;
unsigned int page_offset;
int ret = 0;
page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
if (!obj->pages)
return VM_FAULT_SIGBUS;
page = obj->pages[page_offset];
ret = vm_insert_page(vma, vmf->address, page);
switch (ret) {
case -EAGAIN:
case 0:
case -ERESTARTSYS:
return VM_FAULT_NOPAGE;
case -ENOMEM:
return VM_FAULT_OOM;
default:
return VM_FAULT_SIGBUS;
}
}
int udl_gem_get_pages(struct udl_gem_object *obj)
{
struct page **pages;
if (obj->pages)
return 0;
pages = drm_gem_get_pages(&obj->base);
if (IS_ERR(pages))
return PTR_ERR(pages);
obj->pages = pages;
return 0;
}
void udl_gem_put_pages(struct udl_gem_object *obj)
{
if (obj->base.import_attach) {
kvfree(obj->pages);
obj->pages = NULL;
return;
}
drm_gem_put_pages(&obj->base, obj->pages, false, false);
obj->pages = NULL;
}
int udl_gem_vmap(struct udl_gem_object *obj)
{
int page_count = obj->base.size / PAGE_SIZE;
int ret;
if (obj->base.import_attach) {
obj->vmapping = dma_buf_vmap(obj->base.import_attach->dmabuf);
if (!obj->vmapping)
return -ENOMEM;
return 0;
}
ret = udl_gem_get_pages(obj);
if (ret)
return ret;
obj->vmapping = vmap(obj->pages, page_count, 0, PAGE_KERNEL);
if (!obj->vmapping)
return -ENOMEM;
return 0;
}
void udl_gem_vunmap(struct udl_gem_object *obj)
{
if (obj->base.import_attach) {
dma_buf_vunmap(obj->base.import_attach->dmabuf, obj->vmapping);
return;
}
vunmap(obj->vmapping);
udl_gem_put_pages(obj);
}
void udl_gem_free_object(struct drm_gem_object *gem_obj)
{
struct udl_gem_object *obj = to_udl_bo(gem_obj);
if (obj->vmapping)
udl_gem_vunmap(obj);
if (gem_obj->import_attach) {
drm_prime_gem_destroy(gem_obj, obj->sg);
put_device(gem_obj->dev->dev);
}
if (obj->pages)
udl_gem_put_pages(obj);
drm_gem_free_mmap_offset(gem_obj);
}
/* the dumb interface doesn't work with the GEM straight MMAP
interface, it expects to do MMAP on the drm fd, like normal */
int udl_gem_mmap(struct drm_file *file, struct drm_device *dev,
uint32_t handle, uint64_t *offset)
{
struct udl_gem_object *gobj;
struct drm_gem_object *obj;
int ret = 0;
mutex_lock(&dev->struct_mutex);
obj = drm_gem_object_lookup(file, handle);
if (obj == NULL) {
ret = -ENOENT;
goto unlock;
}
gobj = to_udl_bo(obj);
ret = udl_gem_get_pages(gobj);
if (ret)
goto out;
ret = drm_gem_create_mmap_offset(obj);
if (ret)
goto out;
*offset = drm_vma_node_offset_addr(&gobj->base.vma_node);
out:
drm_gem_object_put(&gobj->base);
unlock:
mutex_unlock(&dev->struct_mutex);
return ret;
}
|
