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virtio_blk: implement mq_ops->commit_rqs() hook 

We need this for blk-mq to kick things into gear, if we told it that
we had more IO coming, but then failed to deliver on that promise.

Reviewed-by: Omar Sandoval <osandov@fb.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2018-11-26 11:00:12 -07:00
parent 04f3eafda6
commit 944e7c8796
1 changed files with 15 additions and 0 deletions
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15
drivers/block/virtio_blk.c
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@ -214,6 +214,20 @@ static void virtblk_done(struct virtqueue *vq)
spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
}
static void virtio_commit_rqs(struct blk_mq_hw_ctx *hctx)
{
struct virtio_blk *vblk = hctx->queue->queuedata;
struct virtio_blk_vq *vq = &vblk->vqs[hctx->queue_num];
bool kick;
spin_lock_irq(&vq->lock);
kick = virtqueue_kick_prepare(vq->vq);
spin_unlock_irq(&vq->lock);
if (kick)
virtqueue_notify(vq->vq);
}
static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
@ -638,6 +652,7 @@ static void virtblk_initialize_rq(struct request *req)
static const struct blk_mq_ops virtio_mq_ops = {
.queue_rq = virtio_queue_rq,
.commit_rqs = virtio_commit_rqs,
.complete = virtblk_request_done,
.init_request = virtblk_init_request,
#ifdef CONFIG_VIRTIO_BLK_SCSI