[PATCH v4 0/2] virtio-blk: support polling I/O and mq_ops->queue_rqs()

Suwan Kim
2022-04-04T09:28:31Z

This patch serise adds support for polling I/O and mq_ops->queue_rqs()
to virtio-blk driver.

Changes

v3 -> v4
- patch1 : virtblk_poll
- Add print the number of default/read/poll queues in init_vq()
- Add blk_mq_start_stopped_hw_queues() to virtblk_poll()
virtblk_poll()
...
if (req_done)
blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
...

- patch2 : virtio_queue_rqs
- Modify virtio_queue_rqs() to hold lock only once when it adds
requests to virtqueue just before virtqueue notify.
It will guarantee that virtio_queue_rqs() will not use
previous req again.

v2 -> v3
- Fix warning by kernel test robot

static int virtblk_poll()
...
if (!blk_mq_add_to_batch(req, iob, virtblk_result(vbr),
-> vbr->status,

v1 -> v2
- To receive the number of poll queues from user,
use module parameter instead of QEMU uapi change.

- Add the comment about virtblk_map_queues().

- Add support for mq_ops->queue_rqs() to implement submit side
batch.

Suwan Kim (2):
virtio-blk: support polling I/O
virtio-blk: support mq_ops->queue_rqs()

drivers/block/virtio_blk.c | 222 ++++++++++++++++++++++++++++++++++---
1 file changed, 207 insertions(+), 15 deletions(-)

--
2.26.3