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 != STATE_INITIALIZING);
38 	if (bo->uuid_state != STATE_OK)
39 		return -ENODEV;
40 
41 	uuid_copy(uuid, &bo->uuid);
42 
43 	return 0;
44 }
45 
46 static struct sg_table *
47 virtgpu_gem_map_dma_buf(struct dma_buf_attachment *attach,
48 			enum dma_data_direction dir)
49 {
50 	struct drm_gem_object *obj = attach->dmabuf->priv;
51 	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
52 
53 	if (virtio_gpu_is_vram(bo))
54 		return virtio_gpu_vram_map_dma_buf(bo, attach->dev, dir);
55 
56 	return drm_gem_map_dma_buf(attach, dir);
57 }
58 
59 static void virtgpu_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
60 				      struct sg_table *sgt,
61 				      enum dma_data_direction dir)
62 {
63 	struct drm_gem_object *obj = attach->dmabuf->priv;
64 	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
65 
66 	if (virtio_gpu_is_vram(bo)) {
67 		virtio_gpu_vram_unmap_dma_buf(attach->dev, sgt, dir);
68 		return;
69 	}
70 
71 	drm_gem_unmap_dma_buf(attach, sgt, dir);
72 }
73 
74 static const struct virtio_dma_buf_ops virtgpu_dmabuf_ops =  {
75 	.ops = {
76 		.cache_sgt_mapping = true,
77 		.attach = virtio_dma_buf_attach,
78 		.detach = drm_gem_map_detach,
79 		.map_dma_buf = virtgpu_gem_map_dma_buf,
80 		.unmap_dma_buf = virtgpu_gem_unmap_dma_buf,
81 		.release = drm_gem_dmabuf_release,
82 		.mmap = drm_gem_dmabuf_mmap,
83 		.vmap = drm_gem_dmabuf_vmap,
84 		.vunmap = drm_gem_dmabuf_vunmap,
85 	},
86 	.device_attach = drm_gem_map_attach,
87 	.get_uuid = virtgpu_virtio_get_uuid,
88 };
89 
90 int virtio_gpu_resource_assign_uuid(struct virtio_gpu_device *vgdev,
91 				    struct virtio_gpu_object *bo)
92 {
93 	int ret;
94 	struct virtio_gpu_object_array *objs;
95 
96 	objs = virtio_gpu_array_alloc(1);
97 	if (!objs)
98 		return -ENOMEM;
99 
100 	virtio_gpu_array_add_obj(objs, &bo->base.base);
101 	ret = virtio_gpu_cmd_resource_assign_uuid(vgdev, objs);
102 	if (ret)
103 		return ret;
104 
105 	return 0;
106 }
107 
108 struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj,
109 					 int flags)
110 {
111 	struct dma_buf *buf;
112 	struct drm_device *dev = obj->dev;
113 	struct virtio_gpu_device *vgdev = dev->dev_private;
114 	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
115 	int ret = 0;
116 	bool blob = bo->host3d_blob || bo->guest_blob;
117 	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
118 
119 	if (!blob) {
120 		if (vgdev->has_resource_assign_uuid) {
121 			ret = virtio_gpu_resource_assign_uuid(vgdev, bo);
122 			if (ret)
123 				return ERR_PTR(ret);
124 
125 			virtio_gpu_notify(vgdev);
126 		} else {
127 			bo->uuid_state = STATE_ERR;
128 		}
129 	} else if (!(bo->blob_flags & VIRTGPU_BLOB_FLAG_USE_CROSS_DEVICE)) {
130 		bo->uuid_state = STATE_ERR;
131 	}
132 
133 	exp_info.ops = &virtgpu_dmabuf_ops.ops;
134 	exp_info.size = obj->size;
135 	exp_info.flags = flags;
136 	exp_info.priv = obj;
137 	exp_info.resv = obj->resv;
138 
139 	buf = virtio_dma_buf_export(&exp_info);
140 	if (IS_ERR(buf))
141 		return buf;
142 
143 	drm_dev_get(dev);
144 	drm_gem_object_get(obj);
145 
146 	return buf;
147 }
148 
149 struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
150 						struct dma_buf *buf)
151 {
152 	struct drm_gem_object *obj;
153 
154 	if (buf->ops == &virtgpu_dmabuf_ops.ops) {
155 		obj = buf->priv;
156 		if (obj->dev == dev) {
157 			/*
158 			 * Importing dmabuf exported from our own gem increases
159 			 * refcount on gem itself instead of f_count of dmabuf.
160 			 */
161 			drm_gem_object_get(obj);
162 			return obj;
163 		}
164 	}
165 
166 	return drm_gem_prime_import(dev, buf);
167 }
168 
169 struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
170 	struct drm_device *dev, struct dma_buf_attachment *attach,
171 	struct sg_table *table)
172 {
173 	return ERR_PTR(-ENODEV);
174 }
175