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virtio: add dma-buf support for exported objects

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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>
This commit is contained in:
David Stevens
2020-08-18 16:13:41 +09:00
committed by Gerd Hoffmann
parent bbaac1354c
commit a0308938ec
5 changed files with 130 additions and 1 deletions
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37
include/linux/virtio_dma_buf.h Normal file
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@@ -0,0 +1,37 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* dma-bufs for virtio exported objects
*
* Copyright (C) 2020 Google, Inc.
*/
#ifndef _LINUX_VIRTIO_DMA_BUF_H
#define _LINUX_VIRTIO_DMA_BUF_H
#include <linux/dma-buf.h>
#include <linux/uuid.h>
#include <linux/virtio.h>
/**
* struct virtio_dma_buf_ops - operations possible on exported object dma-buf
* @ops: the base dma_buf_ops. ops.attach MUST be virtio_dma_buf_attach.
* @device_attach: [optional] callback invoked by virtio_dma_buf_attach during
* all attach operations.
* @get_uid: [required] callback to get the uuid of the exported object.
*/
struct virtio_dma_buf_ops {
struct dma_buf_ops ops;
int (*device_attach)(struct dma_buf *dma_buf,
struct dma_buf_attachment *attach);
int (*get_uuid)(struct dma_buf *dma_buf, uuid_t *uuid);
};
int virtio_dma_buf_attach(struct dma_buf *dma_buf,
struct dma_buf_attachment *attach);
struct dma_buf *virtio_dma_buf_export
(const struct dma_buf_export_info *exp_info);
bool is_virtio_dma_buf(struct dma_buf *dma_buf);
int virtio_dma_buf_get_uuid(struct dma_buf *dma_buf, uuid_t *uuid);
#endif /* _LINUX_VIRTIO_DMA_BUF_H */