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 */ 38