[PATCH V2 3/6] scsi: add flag of .use_managed_irq to 'struct Scsi_Host'

[Ming Lei]

blk-mq needs this information of using managed irq for improving
deactivating hctx, so add such flag to 'struct Scsi_Host', then
drivers can pass such flag to blk-mq via scsi_mq_setup_tags().

The rule is that driver has to tell blk-mq if managed irq is used.

Signed-off-by: Ming Lei <ming.lei at redhat.com>
---
 drivers/scsi/scsi_lib.c  | 12 +++++++-----
 include/scsi/scsi_host.h |  3 +++
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 532304d42f00..743df8e824b9 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1915,6 +1915,8 @@ int scsi_mq_setup_tags(struct Scsi_Host *shost)
 {
 	unsigned int cmd_size, sgl_size;
 	struct blk_mq_tag_set *tag_set = &shost->tag_set;
+	unsigned long flags = BLK_MQ_F_SHOULD_MERGE |
+		BLK_ALLOC_POLICY_TO_MQ_FLAG(shost->hostt->tag_alloc_policy);
 
 	sgl_size = max_t(unsigned int, sizeof(struct scatterlist),
 				scsi_mq_inline_sgl_size(shost));
@@ -1933,12 +1935,12 @@ int scsi_mq_setup_tags(struct Scsi_Host *shost)
 	tag_set->queue_depth = shost->can_queue;
 	tag_set->cmd_size = cmd_size;
 	tag_set->numa_node = NUMA_NO_NODE;
-	tag_set->flags = BLK_MQ_F_SHOULD_MERGE;
-	tag_set->flags |=
-		BLK_ALLOC_POLICY_TO_MQ_FLAG(shost->hostt->tag_alloc_policy);
-	tag_set->driver_data = shost;
 	if (shost->host_tagset)
-		tag_set->flags |= BLK_MQ_F_TAG_HCTX_SHARED;
+		flags |= BLK_MQ_F_TAG_HCTX_SHARED;
+	if (shost->use_managed_irq)
+		flags |= BLK_MQ_F_MANAGED_IRQ;
+	tag_set->flags = flags;
+	tag_set->driver_data = shost;
 
 	return blk_mq_alloc_tag_set(tag_set);
 }
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index d0bf88d77f02..3ac589ae9592 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -657,6 +657,9 @@ struct Scsi_Host {
 	/* True if the host uses host-wide tagspace */
 	unsigned host_tagset:1;
 
+	/* True if the host uses managed irq */
+	unsigned use_managed_irq:1;
+
 	/* Host responded with short (<36 bytes) INQUIRY result */
 	unsigned short_inquiry:1;
 
-- 
2.31.1