diff mbox series

[V5,4/4] nvme: use blk_mq_[un]quiesce_tagset

Message ID 20200911024117.62480-5-ming.lei@redhat.com (mailing list archive)
State New, archived
Headers show
Series blk-mq: implement queue quiesce via percpu_ref for BLK_MQ_F_BLOCKING | expand

Commit Message

Ming Lei Sept. 11, 2020, 2:41 a.m. UTC 
From: Sagi Grimberg <sagi@grimberg.me>

All controller namespaces share the same tagset, so we
can use this interface which does the optimal operation
for parallel quiesce based on the tagset type (e.g.
blocking tagsets and non-blocking tagsets).

Reviewed-by: Hannes Reinecke <hare@suse.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Johannes Thumshirn <Johannes.Thumshirn@wdc.com>
Cc: Chao Leng <lengchao@huawei.com>

Add code to unquiesce ctrl->connect_q in nvme_stop_queues(), meantime
avoid to call blk_mq_quiesce_tagset()/blk_mq_unquiesce_tagset() if
this tagset isn't initialized.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
---
 drivers/nvme/host/core.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)
diff mbox series

Patch

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index ea1fa41fbba8..a6af8978a3ba 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4623,23 +4623,22 @@  EXPORT_SYMBOL_GPL(nvme_start_freeze);
 
 void nvme_stop_queues(struct nvme_ctrl *ctrl)
 {
-	struct nvme_ns *ns;
+	if (list_empty_careful(&ctrl->namespaces))
+		return;
 
-	down_read(&ctrl->namespaces_rwsem);
-	list_for_each_entry(ns, &ctrl->namespaces, list)
-		blk_mq_quiesce_queue(ns->queue);
-	up_read(&ctrl->namespaces_rwsem);
+	blk_mq_quiesce_tagset(ctrl->tagset);
+
+	if (ctrl->connect_q)
+		blk_mq_unquiesce_queue(ctrl->connect_q);
 }
 EXPORT_SYMBOL_GPL(nvme_stop_queues);
 
 void nvme_start_queues(struct nvme_ctrl *ctrl)
 {
-	struct nvme_ns *ns;
+	if (list_empty_careful(&ctrl->namespaces))
+		return;
 
-	down_read(&ctrl->namespaces_rwsem);
-	list_for_each_entry(ns, &ctrl->namespaces, list)
-		blk_mq_unquiesce_queue(ns->queue);
-	up_read(&ctrl->namespaces_rwsem);
+	blk_mq_unquiesce_tagset(ctrl->tagset);
 }
 EXPORT_SYMBOL_GPL(nvme_start_queues);