[PATCH v4 3/3] scsi: ufs: Disable fair tag sharing

[Bart Van Assche <bvanassche@acm.org>]

Disable the block layer fair tag sharing algorithm because it
significantly reduces performance of UFS devices with a maximum queue
depth of 32.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Keith Busch <kbusch@kernel.org>
Cc: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Cc: Yu Kuai <yukuai1@huaweicloud.com>
Cc: Ed Tsai <ed.tsai@mediatek.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/ufs/core/ufshcd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index c2df07545f96..ed04d1263e02 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -8866,6 +8866,7 @@ static const struct scsi_host_template ufshcd_driver_template = {
 	.max_host_blocked	= 1,
 	.track_queue_depth	= 1,
 	.skip_settle_delay	= 1,
+	.disable_fair_tag_sharing = 1,
 	.sdev_groups		= ufshcd_driver_groups,
 	.rpm_autosuspend_delay	= RPM_AUTOSUSPEND_DELAY_MS,
 };