include/linux/virtio_dma_buf.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * dma-bufs for virtio exported objects
   4  *
   5  * Copyright (C) 2020 Google, Inc.
   6  */
   7
   8 #ifndef _LINUX_VIRTIO_DMA_BUF_H
   9 #define _LINUX_VIRTIO_DMA_BUF_H
  10
  11 #include <linux/dma-buf.h>
  12 #include <linux/uuid.h>
  13 #include <linux/virtio.h>
  14
  15 /**
  16  * struct virtio_dma_buf_ops - operations possible on exported object dma-buf
  17  * @ops: the base dma_buf_ops. ops.attach MUST be virtio_dma_buf_attach.
  18  * @device_attach: [optional] callback invoked by virtio_dma_buf_attach during
  19  *                 all attach operations.
  20  * @get_uid: [required] callback to get the uuid of the exported object.
  21  */
  22 struct virtio_dma_buf_ops {
  23         struct dma_buf_ops ops;
  24         int (*device_attach)(struct dma_buf *dma_buf,
  25                              struct dma_buf_attachment *attach);
  26         int (*get_uuid)(struct dma_buf *dma_buf, uuid_t *uuid);
  27 };
  28
  29 int virtio_dma_buf_attach(struct dma_buf *dma_buf,
  30                           struct dma_buf_attachment *attach);
  31
  32 struct dma_buf *virtio_dma_buf_export
  33         (const struct dma_buf_export_info *exp_info);
  34 bool is_virtio_dma_buf(struct dma_buf *dma_buf);
  35 int virtio_dma_buf_get_uuid(struct dma_buf *dma_buf, uuid_t *uuid);
  36
  37 #endif /* _LINUX_VIRTIO_DMA_BUF_H */