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
|
// SPDX-License-Identifier: GPL-2.0
#include "virtgpu_drv.h"
#include <linux/dma-mapping.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);
vm_flags_set(vma, 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;
}
struct sg_table *virtio_gpu_vram_map_dma_buf(struct virtio_gpu_object *bo,
struct device *dev,
enum dma_data_direction dir)
{
struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
struct sg_table *sgt;
dma_addr_t addr;
int ret;
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt)
return ERR_PTR(-ENOMEM);
if (!(bo->blob_flags & VIRTGPU_BLOB_FLAG_USE_MAPPABLE)) {
// Virtio devices can access the dma-buf via its UUID. Return a stub
// sg_table so the dma-buf API still works.
if (!is_virtio_device(dev) || !vgdev->has_resource_assign_uuid) {
ret = -EIO;
goto out;
}
return sgt;
}
ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
if (ret)
goto out;
addr = dma_map_resource(dev, vram->vram_node.start,
vram->vram_node.size, dir,
DMA_ATTR_SKIP_CPU_SYNC);
ret = dma_mapping_error(dev, addr);
if (ret)
goto out;
sg_set_page(sgt->sgl, NULL, vram->vram_node.size, 0);
sg_dma_address(sgt->sgl) = addr;
sg_dma_len(sgt->sgl) = vram->vram_node.size;
return sgt;
out:
sg_free_table(sgt);
kfree(sgt);
return ERR_PTR(ret);
}
void virtio_gpu_vram_unmap_dma_buf(struct device *dev,
struct sg_table *sgt,
enum dma_data_direction dir)
{
if (sgt->nents) {
dma_unmap_resource(dev, sg_dma_address(sgt->sgl),
sg_dma_len(sgt->sgl), dir,
DMA_ATTR_SKIP_CPU_SYNC);
}
sg_free_table(sgt);
kfree(sgt);
}
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,
.export = virtgpu_gem_prime_export,
};
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;
}
|
