/*
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* Copyright 2014 Canonical
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Andreas Pokorny
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*/
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#include <drm/drm_prime.h>
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#include <linux/virtio_dma_buf.h>
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#include "virtgpu_drv.h"
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static int virtgpu_virtio_get_uuid(struct dma_buf *buf,
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uuid_t *uuid)
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{
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struct drm_gem_object *obj = buf->priv;
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struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
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struct virtio_gpu_device *vgdev = obj->dev->dev_private;
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wait_event(vgdev->resp_wq, bo->uuid_state != UUID_INITIALIZING);
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if (bo->uuid_state != UUID_INITIALIZED)
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return -ENODEV;
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uuid_copy(uuid, &bo->uuid);
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return 0;
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}
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const struct virtio_dma_buf_ops virtgpu_dmabuf_ops = {
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.ops = {
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.cache_sgt_mapping = true,
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.attach = virtio_dma_buf_attach,
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.detach = drm_gem_map_detach,
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.map_dma_buf = drm_gem_map_dma_buf,
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.unmap_dma_buf = drm_gem_unmap_dma_buf,
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.release = drm_gem_dmabuf_release,
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.mmap = drm_gem_dmabuf_mmap,
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.vmap = drm_gem_dmabuf_vmap,
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.vunmap = drm_gem_dmabuf_vunmap,
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},
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.device_attach = drm_gem_map_attach,
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.get_uuid = virtgpu_virtio_get_uuid,
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};
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struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj,
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int flags)
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{
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struct dma_buf *buf;
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struct drm_device *dev = obj->dev;
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struct virtio_gpu_device *vgdev = dev->dev_private;
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struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
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struct virtio_gpu_object_array *objs;
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int ret = 0;
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DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
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if (vgdev->has_resource_assign_uuid) {
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objs = virtio_gpu_array_alloc(1);
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if (!objs)
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return ERR_PTR(-ENOMEM);
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virtio_gpu_array_add_obj(objs, &bo->base.base);
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ret = virtio_gpu_cmd_resource_assign_uuid(vgdev, objs);
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if (ret)
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return ERR_PTR(ret);
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virtio_gpu_notify(vgdev);
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} else {
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bo->uuid_state = UUID_INITIALIZATION_FAILED;
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}
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exp_info.ops = &virtgpu_dmabuf_ops.ops;
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exp_info.size = obj->size;
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exp_info.flags = flags;
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exp_info.priv = obj;
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exp_info.resv = obj->resv;
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buf = virtio_dma_buf_export(&exp_info);
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if (IS_ERR(buf))
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return buf;
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drm_dev_get(dev);
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drm_gem_object_get(obj);
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return buf;
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}
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struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
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struct dma_buf *buf)
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{
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struct drm_gem_object *obj;
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if (buf->ops == &virtgpu_dmabuf_ops.ops) {
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obj = buf->priv;
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if (obj->dev == dev) {
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/*
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* Importing dmabuf exported from our own gem increases
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* refcount on gem itself instead of f_count of dmabuf.
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*/
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drm_gem_object_get(obj);
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return obj;
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}
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}
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return drm_gem_prime_import(dev, buf);
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}
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struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
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struct drm_device *dev, struct dma_buf_attachment *attach,
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struct sg_table *table)
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{
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return ERR_PTR(-ENODEV);
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}
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