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
 30static 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
 46static 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
 62int virtio_gpu_resource_assign_uuid(struct virtio_gpu_device *vgdev,
 63				    struct virtio_gpu_object *bo)
 64{
 65	int ret;
 66	struct virtio_gpu_object_array *objs;
 67
 68	objs = virtio_gpu_array_alloc(1);
 69	if (!objs)
 70		return -ENOMEM;
 71
 72	virtio_gpu_array_add_obj(objs, &bo->base.base);
 73	ret = virtio_gpu_cmd_resource_assign_uuid(vgdev, objs);
 74	if (ret)
 75		return ret;
 76
 77	return 0;
 78}
 79
 80struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj,
 81					 int flags)
 82{
 83	struct dma_buf *buf;
 84	struct drm_device *dev = obj->dev;
 85	struct virtio_gpu_device *vgdev = dev->dev_private;
 86	struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
 87	int ret = 0;
 88	bool blob = bo->host3d_blob || bo->guest_blob;
 89	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
 90
 91	if (!blob) {
 92		if (vgdev->has_resource_assign_uuid) {
 93			ret = virtio_gpu_resource_assign_uuid(vgdev, bo);
 94			if (ret)
 95				return ERR_PTR(ret);
 96
 97			virtio_gpu_notify(vgdev);
 98		} else {
 99			bo->uuid_state = STATE_ERR;
100		}
101	}
102
103	exp_info.ops = &virtgpu_dmabuf_ops.ops;
104	exp_info.size = obj->size;
105	exp_info.flags = flags;
106	exp_info.priv = obj;
107	exp_info.resv = obj->resv;
108
109	buf = virtio_dma_buf_export(&exp_info);
110	if (IS_ERR(buf))
111		return buf;
112
113	drm_dev_get(dev);
114	drm_gem_object_get(obj);
115
116	return buf;
117}
118
119struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
120						struct dma_buf *buf)
121{
122	struct drm_gem_object *obj;
123
124	if (buf->ops == &virtgpu_dmabuf_ops.ops) {
125		obj = buf->priv;
126		if (obj->dev == dev) {
127			/*
128			 * Importing dmabuf exported from our own gem increases
129			 * refcount on gem itself instead of f_count of dmabuf.
130			 */
131			drm_gem_object_get(obj);
132			return obj;
133		}
134	}
135
136	return drm_gem_prime_import(dev, buf);
137}
138
139struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
140	struct drm_device *dev, struct dma_buf_attachment *attach,
141	struct sg_table *table)
142{
143	return ERR_PTR(-ENODEV);
144}