1 /*
2 * Copyright 2014 Canonical
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: Andreas Pokorny
23 */
24
25 #include <drm/drm_prime.h>
26 #include <linux/virtio_dma_buf.h>
27
28 #include "virtgpu_drv.h"
29
virtgpu_virtio_get_uuid(struct dma_buf * buf,uuid_t * uuid)30 static int virtgpu_virtio_get_uuid(struct dma_buf *buf,
31 uuid_t *uuid)
32 {
33 struct drm_gem_object *obj = buf->priv;
34 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
35 struct virtio_gpu_device *vgdev = obj->dev->dev_private;
36
37 wait_event(vgdev->resp_wq, bo->uuid_state != UUID_INITIALIZING);
38 if (bo->uuid_state != UUID_INITIALIZED)
39 return -ENODEV;
40
41 uuid_copy(uuid, &bo->uuid);
42
43 return 0;
44 }
45
46 const struct virtio_dma_buf_ops virtgpu_dmabuf_ops = {
47 .ops = {
48 .cache_sgt_mapping = true,
49 .attach = virtio_dma_buf_attach,
50 .detach = drm_gem_map_detach,
51 .map_dma_buf = drm_gem_map_dma_buf,
52 .unmap_dma_buf = drm_gem_unmap_dma_buf,
53 .release = drm_gem_dmabuf_release,
54 .mmap = drm_gem_dmabuf_mmap,
55 .vmap = drm_gem_dmabuf_vmap,
56 .vunmap = drm_gem_dmabuf_vunmap,
57 },
58 .device_attach = drm_gem_map_attach,
59 .get_uuid = virtgpu_virtio_get_uuid,
60 };
61
virtgpu_gem_prime_export(struct drm_gem_object * obj,int flags)62 struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj,
63 int flags)
64 {
65 struct dma_buf *buf;
66 struct drm_device *dev = obj->dev;
67 struct virtio_gpu_device *vgdev = dev->dev_private;
68 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
69 struct virtio_gpu_object_array *objs;
70 int ret = 0;
71 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
72
73 if (vgdev->has_resource_assign_uuid) {
74 objs = virtio_gpu_array_alloc(1);
75 if (!objs)
76 return ERR_PTR(-ENOMEM);
77 virtio_gpu_array_add_obj(objs, &bo->base.base);
78
79 ret = virtio_gpu_cmd_resource_assign_uuid(vgdev, objs);
80 if (ret)
81 return ERR_PTR(ret);
82 virtio_gpu_notify(vgdev);
83 } else {
84 bo->uuid_state = UUID_INITIALIZATION_FAILED;
85 }
86
87 exp_info.ops = &virtgpu_dmabuf_ops.ops;
88 exp_info.size = obj->size;
89 exp_info.flags = flags;
90 exp_info.priv = obj;
91 exp_info.resv = obj->resv;
92
93 buf = virtio_dma_buf_export(&exp_info);
94 if (IS_ERR(buf))
95 return buf;
96
97 drm_dev_get(dev);
98 drm_gem_object_get(obj);
99
100 return buf;
101 }
102
virtgpu_gem_prime_import(struct drm_device * dev,struct dma_buf * buf)103 struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
104 struct dma_buf *buf)
105 {
106 struct drm_gem_object *obj;
107
108 if (buf->ops == &virtgpu_dmabuf_ops.ops) {
109 obj = buf->priv;
110 if (obj->dev == dev) {
111 /*
112 * Importing dmabuf exported from our own gem increases
113 * refcount on gem itself instead of f_count of dmabuf.
114 */
115 drm_gem_object_get(obj);
116 return obj;
117 }
118 }
119
120 return drm_gem_prime_import(dev, buf);
121 }
122
virtgpu_gem_prime_import_sg_table(struct drm_device * dev,struct dma_buf_attachment * attach,struct sg_table * table)123 struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
124 struct drm_device *dev, struct dma_buf_attachment *attach,
125 struct sg_table *table)
126 {
127 return ERR_PTR(-ENODEV);
128 }
129