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vhost: take worker or vq for flushing

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This patch has the core work flush function take a worker. When we
support multiple workers we can then flush each worker during device
removal, stoppage, etc. It also adds a helper to flush specific
virtqueues, so vhost-scsi can flush IO vqs from it's ctl vq.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Message-Id: <20230626232307.97930-7-michael.christie@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Mike Christie 2023-06-26 18:22:56 -05:00 committed by Michael S. Tsirkin
parent 0921dddcb5
commit a6fc04739b
2 changed files with 14 additions and 2 deletions
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15
drivers/vhost/vhost.c
View File

@ -265,16 +265,27 @@ bool vhost_vq_work_queue(struct vhost_virtqueue *vq, struct vhost_work *work)
}
EXPORT_SYMBOL_GPL(vhost_vq_work_queue);
void vhost_dev_flush(struct vhost_dev *dev)
static void vhost_worker_flush(struct vhost_worker *worker)
{
struct vhost_flush_struct flush;
init_completion(&flush.wait_event);
vhost_work_init(&flush.work, vhost_flush_work);
if (vhost_work_queue(dev, &flush.work))
if (vhost_worker_queue(worker, &flush.work))
wait_for_completion(&flush.wait_event);
}
void vhost_vq_flush(struct vhost_virtqueue *vq)
{
vhost_worker_flush(vq->worker);
}
EXPORT_SYMBOL_GPL(vhost_vq_flush);
void vhost_dev_flush(struct vhost_dev *dev)
{
vhost_worker_flush(dev->worker);
}
EXPORT_SYMBOL_GPL(vhost_dev_flush);
/* A lockless hint for busy polling code to exit the loop */

1
drivers/vhost/vhost.h
View File

@ -198,6 +198,7 @@ int vhost_get_vq_desc(struct vhost_virtqueue *,
struct vhost_log *log, unsigned int *log_num);
void vhost_discard_vq_desc(struct vhost_virtqueue *, int n);
void vhost_vq_flush(struct vhost_virtqueue *vq);
bool vhost_vq_work_queue(struct vhost_virtqueue *vq, struct vhost_work *work);
bool vhost_vq_has_work(struct vhost_virtqueue *vq);
bool vhost_vq_is_setup(struct vhost_virtqueue *vq);