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scsi: use host wide tags by default

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This patch changes the !blk-mq path to the same defaults as the blk-mq
I/O path by always enabling block tagging, and always using host wide
tags.  We've had blk-mq available for a few releases so bugs with
this mode should have been ironed out, and this ensures we get better
coverage of over tagging setup over different configs.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
Christoph Hellwig
2015-10-08 09:28:04 +01:00
committed by James Bottomley
parent 720ba808e9
commit 64d513ac31
36 changed files with 39 additions and 211 deletions
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27
drivers/scsi/scsi.c
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@@ -616,32 +616,11 @@ void scsi_finish_command(struct scsi_cmnd *cmd)
*/
int scsi_change_queue_depth(struct scsi_device *sdev, int depth)
{
unsigned long flags;
if (depth <= 0)
goto out;
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
/*
* Check to see if the queue is managed by the block layer.
* If it is, and we fail to adjust the depth, exit.
*
* Do not resize the tag map if it is a host wide share bqt,
* because the size should be the hosts's can_queue. If there
* is more IO than the LLD's can_queue (so there are not enuogh
* tags) request_fn's host queue ready check will handle it.
*/
if (!shost_use_blk_mq(sdev->host) && !sdev->host->bqt) {
if (blk_queue_tagged(sdev->request_queue) &&
blk_queue_resize_tags(sdev->request_queue, depth) != 0)
goto out_unlock;
if (depth > 0) {
sdev->queue_depth = depth;
wmb();
}
sdev->queue_depth = depth;
out_unlock:
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
out:
return sdev->queue_depth;
}
EXPORT_SYMBOL(scsi_change_queue_depth);