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virtio_ring: introduce virtqueue_dma_dev()

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Added virtqueue_dma_dev() to get DMA device for virtio. Then the
caller can do dma operation in advance. The purpose is to keep memory
mapped across multiple add/get buf operations.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20230810123057.43407-6-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xuan Zhuo 2023-08-10 20:30:50 +08:00 committed by Michael S. Tsirkin
parent d7344a2f71
commit 2df6475907
2 changed files with 19 additions and 0 deletions
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17
drivers/virtio/virtio_ring.c
View File

@ -2265,6 +2265,23 @@ int virtqueue_add_inbuf_ctx(struct virtqueue *vq,
}
EXPORT_SYMBOL_GPL(virtqueue_add_inbuf_ctx);
/**
* virtqueue_dma_dev - get the dma dev
* @_vq: the struct virtqueue we're talking about.
*
* Returns the dma dev. That can been used for dma api.
*/
struct device *virtqueue_dma_dev(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
if (vq->use_dma_api)
return vring_dma_dev(vq);
else
return NULL;
}
EXPORT_SYMBOL_GPL(virtqueue_dma_dev);
/**
* virtqueue_kick_prepare - first half of split virtqueue_kick call.
* @_vq: the struct virtqueue

2
include/linux/virtio.h
View File

@ -61,6 +61,8 @@ int virtqueue_add_sgs(struct virtqueue *vq,
void *data,
gfp_t gfp);
struct device *virtqueue_dma_dev(struct virtqueue *vq);
bool virtqueue_kick(struct virtqueue *vq);
bool virtqueue_kick_prepare(struct virtqueue *vq);