forked from mirrors/linux
a0308938ec
This change adds a new flavor of dma-bufs that can be used by virtio drivers to share exported objects. A virtio dma-buf can be queried by virtio drivers to obtain the UUID which identifies the underlying exported object. Signed-off-by: David Stevens <stevensd@chromium.org> Acked-by: Michael S. Tsirkin <mst@redhat.com> Link: http://patchwork.freedesktop.org/patch/msgid/20200818071343.3461203-2-stevensd@chromium.org Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* dma-bufs for virtio exported objects
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*
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* Copyright (C) 2020 Google, Inc.
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*/
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#ifndef _LINUX_VIRTIO_DMA_BUF_H
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#define _LINUX_VIRTIO_DMA_BUF_H
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#include <linux/dma-buf.h>
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#include <linux/uuid.h>
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#include <linux/virtio.h>
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/**
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* struct virtio_dma_buf_ops - operations possible on exported object dma-buf
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* @ops: the base dma_buf_ops. ops.attach MUST be virtio_dma_buf_attach.
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* @device_attach: [optional] callback invoked by virtio_dma_buf_attach during
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* all attach operations.
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* @get_uid: [required] callback to get the uuid of the exported object.
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*/
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struct virtio_dma_buf_ops {
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struct dma_buf_ops ops;
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int (*device_attach)(struct dma_buf *dma_buf,
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struct dma_buf_attachment *attach);
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int (*get_uuid)(struct dma_buf *dma_buf, uuid_t *uuid);
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};
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int virtio_dma_buf_attach(struct dma_buf *dma_buf,
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struct dma_buf_attachment *attach);
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struct dma_buf *virtio_dma_buf_export
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(const struct dma_buf_export_info *exp_info);
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bool is_virtio_dma_buf(struct dma_buf *dma_buf);
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int virtio_dma_buf_get_uuid(struct dma_buf *dma_buf, uuid_t *uuid);
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#endif /* _LINUX_VIRTIO_DMA_BUF_H */
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