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/*
* Copyright 2014 Canonical
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: Andreas Pokorny
*/
#include <drm/drm_prime.h>
#include <linux/virtio_dma_buf.h>
#include "virtgpu_drv.h"
static int virtgpu_virtio_get_uuid(struct dma_buf *buf,
uuid_t *uuid)
{
struct drm_gem_object *obj = buf->priv;
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
struct virtio_gpu_device *vgdev = obj->dev->dev_private;
wait_event(vgdev->resp_wq, bo->uuid_state != STATE_INITIALIZING);
if (bo->uuid_state != STATE_OK)
return -ENODEV;
uuid_copy(uuid, &bo->uuid);
return 0;
}
static struct sg_table *
virtgpu_gem_map_dma_buf(struct dma_buf_attachment *attach,
enum dma_data_direction dir)
{
struct drm_gem_object *obj = attach->dmabuf->priv;
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
if (virtio_gpu_is_vram(bo))
return virtio_gpu_vram_map_dma_buf(bo, attach->dev, dir);
return drm_gem_map_dma_buf(attach, dir);
}
static void virtgpu_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
struct sg_table *sgt,
enum dma_data_direction dir)
{
struct drm_gem_object *obj = attach->dmabuf->priv;
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
if (virtio_gpu_is_vram(bo)) {
virtio_gpu_vram_unmap_dma_buf(attach->dev, sgt, dir);
return;
}
drm_gem_unmap_dma_buf(attach, sgt, dir);
}
static const struct virtio_dma_buf_ops virtgpu_dmabuf_ops = {
.ops = {
.cache_sgt_mapping = true,
.attach = virtio_dma_buf_attach,
.detach = drm_gem_map_detach,
.map_dma_buf = virtgpu_gem_map_dma_buf,
.unmap_dma_buf = virtgpu_gem_unmap_dma_buf,
.release = drm_gem_dmabuf_release,
.mmap = drm_gem_dmabuf_mmap,
.vmap = drm_gem_dmabuf_vmap,
.vunmap = drm_gem_dmabuf_vunmap,
},
.device_attach = drm_gem_map_attach,
.get_uuid = virtgpu_virtio_get_uuid,
};
int virtio_gpu_resource_assign_uuid(struct virtio_gpu_device *vgdev,
struct virtio_gpu_object *bo)
{
int ret;
struct virtio_gpu_object_array *objs;
objs = virtio_gpu_array_alloc(1);
if (!objs)
return -ENOMEM;
virtio_gpu_array_add_obj(objs, &bo->base.base);
ret = virtio_gpu_cmd_resource_assign_uuid(vgdev, objs);
if (ret)
return ret;
return 0;
}
struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj,
int flags)
{
struct dma_buf *buf;
struct drm_device *dev = obj->dev;
struct virtio_gpu_device *vgdev = dev->dev_private;
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
int ret = 0;
bool blob = bo->host3d_blob || bo->guest_blob;
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
if (!blob) {
if (vgdev->has_resource_assign_uuid) {
ret = virtio_gpu_resource_assign_uuid(vgdev, bo);
if (ret)
return ERR_PTR(ret);
virtio_gpu_notify(vgdev);
} else {
bo->uuid_state = STATE_ERR;
}
} else if (!(bo->blob_flags & VIRTGPU_BLOB_FLAG_USE_CROSS_DEVICE)) {
bo->uuid_state = STATE_ERR;
}
exp_info.ops = &virtgpu_dmabuf_ops.ops;
exp_info.size = obj->size;
exp_info.flags = flags;
exp_info.priv = obj;
exp_info.resv = obj->resv;
buf = virtio_dma_buf_export(&exp_info);
if (IS_ERR(buf))
return buf;
drm_dev_get(dev);
drm_gem_object_get(obj);
return buf;
}
struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
struct dma_buf *buf)
{
struct drm_gem_object *obj;
if (buf->ops == &virtgpu_dmabuf_ops.ops) {
obj = buf->priv;
if (obj->dev == dev) {
/*
* Importing dmabuf exported from our own gem increases
* refcount on gem itself instead of f_count of dmabuf.
*/
drm_gem_object_get(obj);
return obj;
}
}
return drm_gem_prime_import(dev, buf);
}
struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
struct drm_device *dev, struct dma_buf_attachment *attach,
struct sg_table *table)
{
return ERR_PTR(-ENODEV);
}
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