[PATCH 5/8] virtio_blk: implement mq_ops->commit_rqs() hook

[axboe@kernel.dk (Jens Axboe)]

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.

Signed-off-by: Jens Axboe <axboe at kernel.dk>
---
 drivers/block/virtio_blk.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 6e869d05f91e..b49c57e77780 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -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;
+	int qid = hctx->queue_num;
+	bool kick;
+
+	spin_lock_irq(&vblk->vqs[qid].lock);
+	kick = virtqueue_kick_prepare(vblk->vqs[qid].vq);
+	spin_unlock_irq(&vblk->vqs[qid].lock);
+
+	if (kick)
+		virtqueue_notify(vblk->vqs[qid].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
-- 
2.17.1