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
|
// SPDX-License-Identifier: GPL-2.0
#include "virtgpu_drv.h"
static void virtio_gpu_vram_free(struct drm_gem_object *obj)
{
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
struct virtio_gpu_device *vgdev = obj->dev->dev_private;
struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
bool unmap;
if (bo->created) {
spin_lock(&vgdev->host_visible_lock);
unmap = drm_mm_node_allocated(&vram->vram_node);
spin_unlock(&vgdev->host_visible_lock);
if (unmap)
virtio_gpu_cmd_unmap(vgdev, bo);
virtio_gpu_cmd_unref_resource(vgdev, bo);
virtio_gpu_notify(vgdev);
return;
}
}
static const struct vm_operations_struct virtio_gpu_vram_vm_ops = {
.open = drm_gem_vm_open,
.close = drm_gem_vm_close,
};
static int virtio_gpu_vram_mmap(struct drm_gem_object *obj,
struct vm_area_struct *vma)
{
int ret;
struct virtio_gpu_device *vgdev = obj->dev->dev_private;
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
unsigned long vm_size = vma->vm_end - vma->vm_start;
if (!(bo->blob_flags & VIRTGPU_BLOB_FLAG_USE_MAPPABLE))
return -EINVAL;
wait_event(vgdev->resp_wq, vram->map_state != STATE_INITIALIZING);
if (vram->map_state != STATE_OK)
return -EINVAL;
vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
vma->vm_flags |= VM_MIXEDMAP | VM_DONTEXPAND;
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
vma->vm_ops = &virtio_gpu_vram_vm_ops;
if (vram->map_info == VIRTIO_GPU_MAP_CACHE_WC)
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
else if (vram->map_info == VIRTIO_GPU_MAP_CACHE_UNCACHED)
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
/* Partial mappings of GEM buffers don't happen much in practice. */
if (vm_size != vram->vram_node.size)
return -EINVAL;
ret = io_remap_pfn_range(vma, vma->vm_start,
vram->vram_node.start >> PAGE_SHIFT,
vm_size, vma->vm_page_prot);
return ret;
}
static const struct drm_gem_object_funcs virtio_gpu_vram_funcs = {
.open = virtio_gpu_gem_object_open,
.close = virtio_gpu_gem_object_close,
.free = virtio_gpu_vram_free,
.mmap = virtio_gpu_vram_mmap,
};
bool virtio_gpu_is_vram(struct virtio_gpu_object *bo)
{
return bo->base.base.funcs == &virtio_gpu_vram_funcs;
}
static int virtio_gpu_vram_map(struct virtio_gpu_object *bo)
{
int ret;
uint64_t offset;
struct virtio_gpu_object_array *objs;
struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
if (!vgdev->has_host_visible)
return -EINVAL;
spin_lock(&vgdev->host_visible_lock);
ret = drm_mm_insert_node(&vgdev->host_visible_mm, &vram->vram_node,
bo->base.base.size);
spin_unlock(&vgdev->host_visible_lock);
if (ret)
return ret;
objs = virtio_gpu_array_alloc(1);
if (!objs) {
ret = -ENOMEM;
goto err_remove_node;
}
virtio_gpu_array_add_obj(objs, &bo->base.base);
/*TODO: Add an error checking helper function in drm_mm.h */
offset = vram->vram_node.start - vgdev->host_visible_region.addr;
ret = virtio_gpu_cmd_map(vgdev, objs, offset);
if (ret) {
virtio_gpu_array_put_free(objs);
goto err_remove_node;
}
return 0;
err_remove_node:
spin_lock(&vgdev->host_visible_lock);
drm_mm_remove_node(&vram->vram_node);
spin_unlock(&vgdev->host_visible_lock);
return ret;
}
int virtio_gpu_vram_create(struct virtio_gpu_device *vgdev,
struct virtio_gpu_object_params *params,
struct virtio_gpu_object **bo_ptr)
{
struct drm_gem_object *obj;
struct virtio_gpu_object_vram *vram;
int ret;
vram = kzalloc(sizeof(*vram), GFP_KERNEL);
if (!vram)
return -ENOMEM;
obj = &vram->base.base.base;
obj->funcs = &virtio_gpu_vram_funcs;
params->size = PAGE_ALIGN(params->size);
drm_gem_private_object_init(vgdev->ddev, obj, params->size);
/* Create fake offset */
ret = drm_gem_create_mmap_offset(obj);
if (ret) {
kfree(vram);
return ret;
}
ret = virtio_gpu_resource_id_get(vgdev, &vram->base.hw_res_handle);
if (ret) {
kfree(vram);
return ret;
}
virtio_gpu_cmd_resource_create_blob(vgdev, &vram->base, params, NULL,
0);
if (params->blob_flags & VIRTGPU_BLOB_FLAG_USE_MAPPABLE) {
ret = virtio_gpu_vram_map(&vram->base);
if (ret) {
virtio_gpu_vram_free(obj);
return ret;
}
}
*bo_ptr = &vram->base;
return 0;
}
|
