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Subject[PATCH RFC 4/5] scsi: Add template flag 'host_tagset'
Date
From: Hannes Reinecke <hare@suse.com>

Add a host template flag 'host_tagset' so hostwide tagset can be
shared on multiple reply queues after the SCSI device's reply queue
is converted to blk-mq hw queue.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: John Garry <john.garry@huawei.com>
---
drivers/scsi/scsi_lib.c | 2 ++
include/scsi/scsi_host.h | 3 +++
2 files changed, 5 insertions(+)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index dc210b9d4896..4baa5c01a0bc 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1900,6 +1900,8 @@ int scsi_mq_setup_tags(struct Scsi_Host *shost)
shost->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
shost->tag_set.flags |=
BLK_ALLOC_POLICY_TO_MQ_FLAG(shost->hostt->tag_alloc_policy);
+ if (shost->hostt->host_tagset)
+ shost->tag_set.flags |= BLK_MQ_F_TAG_HCTX_SHARED;
shost->tag_set.driver_data = shost;

return blk_mq_alloc_tag_set(&shost->tag_set);
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 2c3f0c58869b..a90d7e38366b 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -442,6 +442,9 @@ struct scsi_host_template {
/* True if the low-level driver supports blk-mq only */
unsigned force_blk_mq:1;

+ /* True if the host uses host-wide tagspace */
+ unsigned host_tagset:1;
+
/*
* Countdown for host blocking with no commands outstanding.
*/
--
2.17.1
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