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 != 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 *
virtgpu_gem_map_dma_buf(struct dma_buf_attachment * attach,enum dma_data_direction dir)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
virtgpu_gem_unmap_dma_buf(struct dma_buf_attachment * attach,struct sg_table * sgt,enum dma_data_direction dir)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
virtio_gpu_resource_assign_uuid(struct virtio_gpu_device * vgdev,struct virtio_gpu_object * bo)90 int virtio_gpu_resource_assign_uuid(struct virtio_gpu_device *vgdev,
91 struct virtio_gpu_object *bo)
92 {
93 struct virtio_gpu_object_array *objs;
94
95 objs = virtio_gpu_array_alloc(1);
96 if (!objs)
97 return -ENOMEM;
98
99 virtio_gpu_array_add_obj(objs, &bo->base.base);
100
101 return virtio_gpu_cmd_resource_assign_uuid(vgdev, objs);
102 }
103
virtgpu_gem_prime_export(struct drm_gem_object * obj,int flags)104 struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj,
105 int flags)
106 {
107 struct dma_buf *buf;
108 struct drm_device *dev = obj->dev;
109 struct virtio_gpu_device *vgdev = dev->dev_private;
110 struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
111 int ret = 0;
112 bool blob = bo->host3d_blob || bo->guest_blob;
113 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
114
115 if (!blob) {
116 if (vgdev->has_resource_assign_uuid) {
117 ret = virtio_gpu_resource_assign_uuid(vgdev, bo);
118 if (ret)
119 return ERR_PTR(ret);
120
121 virtio_gpu_notify(vgdev);
122 } else {
123 bo->uuid_state = STATE_ERR;
124 }
125 } else if (!(bo->blob_flags & VIRTGPU_BLOB_FLAG_USE_CROSS_DEVICE)) {
126 bo->uuid_state = STATE_ERR;
127 }
128
129 exp_info.ops = &virtgpu_dmabuf_ops.ops;
130 exp_info.size = obj->size;
131 exp_info.flags = flags;
132 exp_info.priv = obj;
133 exp_info.resv = obj->resv;
134
135 buf = virtio_dma_buf_export(&exp_info);
136 if (IS_ERR(buf))
137 return buf;
138
139 drm_dev_get(dev);
140 drm_gem_object_get(obj);
141
142 return buf;
143 }
144
virtgpu_gem_prime_import(struct drm_device * dev,struct dma_buf * buf)145 struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
146 struct dma_buf *buf)
147 {
148 struct drm_gem_object *obj;
149
150 if (buf->ops == &virtgpu_dmabuf_ops.ops) {
151 obj = buf->priv;
152 if (obj->dev == dev) {
153 /*
154 * Importing dmabuf exported from our own gem increases
155 * refcount on gem itself instead of f_count of dmabuf.
156 */
157 drm_gem_object_get(obj);
158 return obj;
159 }
160 }
161
162 return drm_gem_prime_import(dev, buf);
163 }
164
virtgpu_gem_prime_import_sg_table(struct drm_device * dev,struct dma_buf_attachment * attach,struct sg_table * table)165 struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
166 struct drm_device *dev, struct dma_buf_attachment *attach,
167 struct sg_table *table)
168 {
169 return ERR_PTR(-ENODEV);
170 }
171