From: Hannes Reinecke <h...@suse.com>
Add a host template flag 'host_tagset' to enable the use of a global
tagset for block-mq.
Cc: Hannes Reinecke <h...@suse.de>
Cc: Arun Easi <arun.e...@cavium.com>
Cc: Omar Sandoval <osan...@fb.com>,
Cc: "Martin K. Petersen" <martin.peter...@oracle.com>,
Cc: James Bottomley <james.bottom...@hansenpartnership.com>,
Cc: Christoph Hellwig <h...@lst.de>,
Cc: Don Brace <don.br...@microsemi.com>
Cc: Kashyap Desai <kashyap.de...@broadcom.com>
Cc: Peter Rivera <peter.riv...@broadcom.com>
Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: Mike Snitzer <snit...@redhat.com>
Tested-by: Laurence Oberman <lober...@redhat.com>
Signed-off-by: Hannes Reinecke <h...@suse.com>
Signed-off-by: Ming Lei <ming....@redhat.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 55be2550c555..9ab74ac634ea 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2274,6 +2274,8 @@ int scsi_mq_setup_tags(struct Scsi_Host *shost)
shost->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_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_GLOBAL_TAGS;
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 a8b7bf879ced..f6623f887ee4 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -457,6 +457,9 @@ struct scsi_host_template {
*/
unsigned int max_host_blocked;
+ /* True if the host supports a host-wide tagspace */
+ unsigned host_tagset:1;
+
/*
* Default value for the blocking. If the queue is empty,
* host_blocked counts down in the request_fn until it restarts
--
2.9.5
