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virtio-blk: support per-device queue depth 

module parameter 'virtblk_queue_depth' was firstly introduced for
testing/benchmarking purposes described in commit fc4324b459
("virtio-blk: base queue-depth on virtqueue ringsize or module param").
And currently 'virtblk_queue_depth' is used as a saved value for the
first probed device.
Since we have different virtio-blk devices which have different
capabilities, it requires that we support per-device queue depth instead
of per-module. So defaultly use vq free elements if module parameter
'virtblk_queue_depth' is not set.

Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/1611307306-71067-1-git-send-email-joseph.qi@linux.alibaba.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Joseph Qi 2021-01-22 17:21:46 +08:00 committed by Michael S. Tsirkin
parent 1628c6877f
commit d1e9aa9c34
1 changed files with 7 additions and 4 deletions
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11
drivers/block/virtio_blk.c
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@ -705,6 +705,7 @@ static int virtblk_probe(struct virtio_device *vdev)
u32 v, blk_size, max_size, sg_elems, opt_io_size;
u16 min_io_size;
u8 physical_block_exp, alignment_offset;
unsigned int queue_depth;
if (!vdev->config->get) {
dev_err(&vdev->dev, "%s failure: config access disabled\n",
@ -756,16 +757,18 @@ static int virtblk_probe(struct virtio_device *vdev)
}
/* Default queue sizing is to fill the ring. */
if (!virtblk_queue_depth) {
virtblk_queue_depth = vblk->vqs[0].vq->num_free;
if (likely(!virtblk_queue_depth)) {
queue_depth = vblk->vqs[0].vq->num_free;
/* ... but without indirect descs, we use 2 descs per req */
if (!virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC))
virtblk_queue_depth /= 2;
queue_depth /= 2;
} else {
queue_depth = virtblk_queue_depth;
}
memset(&vblk->tag_set, 0, sizeof(vblk->tag_set));
vblk->tag_set.ops = &virtio_mq_ops;
vblk->tag_set.queue_depth = virtblk_queue_depth;
vblk->tag_set.queue_depth = queue_depth;
vblk->tag_set.numa_node = NUMA_NO_NODE;
vblk->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
vblk->tag_set.cmd_size =