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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

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Pull virtio fix from Michael Tsirkin:
 "A last minute revert to fix a regression"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  Revert "virtio-blk: support completion batching for the IRQ path"
This commit is contained in:
Linus Torvalds
2023-06-21 11:10:40 -07:00
parent 69cbeb61ff afd384f0db
commit 0070349771
1 changed files with 37 additions and 45 deletions
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80
drivers/block/virtio_blk.c
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@@ -348,63 +348,33 @@ static inline void virtblk_request_done(struct request *req)
blk_mq_end_request(req, status);
}
static void virtblk_complete_batch(struct io_comp_batch *iob)
{
struct request *req;
rq_list_for_each(&iob->req_list, req) {
virtblk_unmap_data(req, blk_mq_rq_to_pdu(req));
virtblk_cleanup_cmd(req);
}
blk_mq_end_request_batch(iob);
}
static int virtblk_handle_req(struct virtio_blk_vq *vq,
struct io_comp_batch *iob)
{
struct virtblk_req *vbr;
int req_done = 0;
unsigned int len;
while ((vbr = virtqueue_get_buf(vq->vq, &len)) != NULL) {
struct request *req = blk_mq_rq_from_pdu(vbr);
if (likely(!blk_should_fake_timeout(req->q)) &&
!blk_mq_complete_request_remote(req) &&
!blk_mq_add_to_batch(req, iob, virtblk_vbr_status(vbr),
virtblk_complete_batch))
virtblk_request_done(req);
req_done++;
}
return req_done;
}
static void virtblk_done(struct virtqueue *vq)
{
struct virtio_blk *vblk = vq->vdev->priv;
struct virtio_blk_vq *vblk_vq = &vblk->vqs[vq->index];
int req_done = 0;
bool req_done = false;
int qid = vq->index;
struct virtblk_req *vbr;
unsigned long flags;
DEFINE_IO_COMP_BATCH(iob);
unsigned int len;
spin_lock_irqsave(&vblk_vq->lock, flags);
spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
do {
virtqueue_disable_cb(vq);
req_done += virtblk_handle_req(vblk_vq, &iob);
while ((vbr = virtqueue_get_buf(vblk->vqs[qid].vq, &len)) != NULL) {
struct request *req = blk_mq_rq_from_pdu(vbr);
if (likely(!blk_should_fake_timeout(req->q)))
blk_mq_complete_request(req);
req_done = true;
}
if (unlikely(virtqueue_is_broken(vq)))
break;
} while (!virtqueue_enable_cb(vq));
if (req_done) {
if (!rq_list_empty(iob.req_list))
iob.complete(&iob);
/* In case queue is stopped waiting for more buffers. */
if (req_done)
blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
}
spin_unlock_irqrestore(&vblk_vq->lock, flags);
spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
}
static void virtio_commit_rqs(struct blk_mq_hw_ctx *hctx)
@@ -1283,15 +1253,37 @@ static void virtblk_map_queues(struct blk_mq_tag_set *set)
}
}
static void virtblk_complete_batch(struct io_comp_batch *iob)
{
struct request *req;
rq_list_for_each(&iob->req_list, req) {
virtblk_unmap_data(req, blk_mq_rq_to_pdu(req));
virtblk_cleanup_cmd(req);
}
blk_mq_end_request_batch(iob);
}
static int virtblk_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob)
{
struct virtio_blk *vblk = hctx->queue->queuedata;
struct virtio_blk_vq *vq = get_virtio_blk_vq(hctx);
struct virtblk_req *vbr;
unsigned long flags;
unsigned int len;
int found = 0;
spin_lock_irqsave(&vq->lock, flags);
found = virtblk_handle_req(vq, iob);
while ((vbr = virtqueue_get_buf(vq->vq, &len)) != NULL) {
struct request *req = blk_mq_rq_from_pdu(vbr);
found++;
if (!blk_mq_complete_request_remote(req) &&
!blk_mq_add_to_batch(req, iob, virtblk_vbr_status(vbr),
virtblk_complete_batch))
virtblk_request_done(req);
}
if (found)
blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);