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
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2012 Red Hat
*/
#include <linux/dma-buf.h>
#include <linux/vmalloc.h>
#include <drm/drm_drv.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_mode.h>
#include <drm/drm_prime.h>
#include "udl_drv.h"
/*
* GEM object funcs
*/
static int udl_gem_object_mmap(struct drm_gem_object *obj,
struct vm_area_struct *vma)
{
int ret;
ret = drm_gem_shmem_mmap(obj, vma);
if (ret)
return ret;
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
if (obj->import_attach)
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
return 0;
}
static void *udl_gem_object_vmap(struct drm_gem_object *obj)
{
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
int ret;
ret = mutex_lock_interruptible(&shmem->vmap_lock);
if (ret)
return ERR_PTR(ret);
if (shmem->vmap_use_count++ > 0)
goto out;
ret = drm_gem_shmem_get_pages(shmem);
if (ret)
goto err_zero_use;
if (obj->import_attach)
shmem->vaddr = dma_buf_vmap(obj->import_attach->dmabuf);
else
shmem->vaddr = vmap(shmem->pages, obj->size >> PAGE_SHIFT,
VM_MAP, PAGE_KERNEL);
if (!shmem->vaddr) {
DRM_DEBUG_KMS("Failed to vmap pages\n");
ret = -ENOMEM;
goto err_put_pages;
}
out:
mutex_unlock(&shmem->vmap_lock);
return shmem->vaddr;
err_put_pages:
drm_gem_shmem_put_pages(shmem);
err_zero_use:
shmem->vmap_use_count = 0;
mutex_unlock(&shmem->vmap_lock);
return ERR_PTR(ret);
}
static const struct drm_gem_object_funcs udl_gem_object_funcs = {
.free = drm_gem_shmem_free_object,
.print_info = drm_gem_shmem_print_info,
.pin = drm_gem_shmem_pin,
.unpin = drm_gem_shmem_unpin,
.get_sg_table = drm_gem_shmem_get_sg_table,
.vmap = udl_gem_object_vmap,
.vunmap = drm_gem_shmem_vunmap,
.mmap = udl_gem_object_mmap,
};
/*
* Helpers for struct drm_driver
*/
struct drm_gem_object *udl_driver_gem_create_object(struct drm_device *dev,
size_t size)
{
struct drm_gem_shmem_object *shmem;
struct drm_gem_object *obj;
shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
if (!shmem)
return NULL;
obj = &shmem->base;
obj->funcs = &udl_gem_object_funcs;
return obj;
}
|
