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
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2014-2018 Etnaviv Project
*/
#include <drm/drm_prime.h>
#include <linux/dma-buf.h>
#include <linux/module.h>
#include "etnaviv_drv.h"
#include "etnaviv_gem.h"
MODULE_IMPORT_NS(DMA_BUF);
static struct lock_class_key etnaviv_prime_lock_class;
struct sg_table *etnaviv_gem_prime_get_sg_table(struct drm_gem_object *obj)
{
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
int npages = obj->size >> PAGE_SHIFT;
if (WARN_ON(!etnaviv_obj->pages)) /* should have already pinned! */
return ERR_PTR(-EINVAL);
return drm_prime_pages_to_sg(obj->dev, etnaviv_obj->pages, npages);
}
int etnaviv_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
{
void *vaddr;
vaddr = etnaviv_gem_vmap(obj);
if (!vaddr)
return -ENOMEM;
iosys_map_set_vaddr(map, vaddr);
return 0;
}
int etnaviv_gem_prime_pin(struct drm_gem_object *obj)
{
if (!obj->import_attach) {
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
mutex_lock(&etnaviv_obj->lock);
etnaviv_gem_get_pages(etnaviv_obj);
mutex_unlock(&etnaviv_obj->lock);
}
return 0;
}
void etnaviv_gem_prime_unpin(struct drm_gem_object *obj)
{
if (!obj->import_attach) {
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
mutex_lock(&etnaviv_obj->lock);
etnaviv_gem_put_pages(to_etnaviv_bo(obj));
mutex_unlock(&etnaviv_obj->lock);
}
}
static void etnaviv_gem_prime_release(struct etnaviv_gem_object *etnaviv_obj)
{
struct iosys_map map = IOSYS_MAP_INIT_VADDR(etnaviv_obj->vaddr);
if (etnaviv_obj->vaddr)
dma_buf_vunmap_unlocked(etnaviv_obj->base.import_attach->dmabuf, &map);
/* Don't drop the pages for imported dmabuf, as they are not
* ours, just free the array we allocated:
*/
kvfree(etnaviv_obj->pages);
drm_prime_gem_destroy(&etnaviv_obj->base, etnaviv_obj->sgt);
}
static void *etnaviv_gem_prime_vmap_impl(struct etnaviv_gem_object *etnaviv_obj)
{
struct iosys_map map;
int ret;
lockdep_assert_held(&etnaviv_obj->lock);
ret = dma_buf_vmap(etnaviv_obj->base.import_attach->dmabuf, &map);
if (ret)
return NULL;
return map.vaddr;
}
static int etnaviv_gem_prime_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
struct vm_area_struct *vma)
{
int ret;
ret = dma_buf_mmap(etnaviv_obj->base.dma_buf, vma, 0);
if (!ret) {
/* Drop the reference acquired by drm_gem_mmap_obj(). */
drm_gem_object_put(&etnaviv_obj->base);
}
return ret;
}
static const struct etnaviv_gem_ops etnaviv_gem_prime_ops = {
/* .get_pages should never be called */
.release = etnaviv_gem_prime_release,
.vmap = etnaviv_gem_prime_vmap_impl,
.mmap = etnaviv_gem_prime_mmap_obj,
};
struct drm_gem_object *etnaviv_gem_prime_import_sg_table(struct drm_device *dev,
struct dma_buf_attachment *attach, struct sg_table *sgt)
{
struct etnaviv_gem_object *etnaviv_obj;
size_t size = PAGE_ALIGN(attach->dmabuf->size);
int ret, npages;
ret = etnaviv_gem_new_private(dev, size, ETNA_BO_WC,
&etnaviv_gem_prime_ops, &etnaviv_obj);
if (ret < 0)
return ERR_PTR(ret);
lockdep_set_class(&etnaviv_obj->lock, &etnaviv_prime_lock_class);
npages = size / PAGE_SIZE;
etnaviv_obj->sgt = sgt;
etnaviv_obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
if (!etnaviv_obj->pages) {
ret = -ENOMEM;
goto fail;
}
ret = drm_prime_sg_to_page_array(sgt, etnaviv_obj->pages, npages);
if (ret)
goto fail;
etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
return &etnaviv_obj->base;
fail:
drm_gem_object_put(&etnaviv_obj->base);
return ERR_PTR(ret);
}
|
