>From scsi driver view, it is a bit troublesome to support both
blk-mq and non-blk-mq at the same time, especially when drivers
start to support multi hw-queue.
This patch introduces 'force_blk_mq' to scsi_host_template
so that drivers can provide blk-mq only support, and avoid
to consider legacy support.
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxxxxx>
---
drivers/scsi/hosts.c | 3 ++-
include/scsi/scsi_host.h | 3 +++
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 06030e1..d2b83f8 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -459,7 +459,8 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
else
shost->dma_boundary = 0xffffffff;
- shost->use_blk_mq = scsi_use_blk_mq && !shost->hostt->disable_blk_mq;
+ shost->use_blk_mq = (scsi_use_blk_mq && !shost->hostt->disable_blk_mq)
+ || shost->hostt->force_blk_mq;
device_initialize(&shost->shost_gendev);
dev_set_name(&shost->shost_gendev, "host%d", shost->host_no);
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 537c431..75c1468 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -514,6 +514,9 @@ struct scsi_host_template {
/* temporary flag to disable blk-mq I/O path */
bool disable_blk_mq;
+
+ /* tell scsi core we only support blk-mq */
+ bool force_blk_mq;
};
/*
--
1.7.9.5
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