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 
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 
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 
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 
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