[PATCH 2/2] scsi: register sysfs for scsi workqueue

From: Bob Liu <bob.liu@oracle.com>
To: linux-scsi@vger.kernel.org
Cc: martin.petersen@oracle.com, open-iscsi@googlegroups.com,
	lduncan@suse.com, michael.christie@oracle.com,
	Bob Liu <bob.liu@oracle.com>
Subject: [PATCH 2/2] scsi: register sysfs for scsi workqueue
Date: Wed,  1 Jul 2020 11:07:45 +0800	[thread overview]
Message-ID: <20200701030745.16897-2-bob.liu@oracle.com> (raw)
In-Reply-To: <20200701030745.16897-1-bob.liu@oracle.com>

So that scsi_wq_xxx and scsi_tmf_xxx can be bind to different cpu to get better
isolation.

This patch unfolded create_singlethread_workqueue(), added WQ_SYSFS and dropped
__WQ_ORDERED_EXPLICIT since __WQ_ORDERED_EXPLICIT workqueue isn't allowed to
change "cpumask".

Signed-off-by: Bob Liu <bob.liu@oracle.com>
---
 drivers/scsi/hosts.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 7ec91c3..37d1c55 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -272,8 +272,10 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
 	if (shost->transportt->create_work_queue) {
 		snprintf(shost->work_q_name, sizeof(shost->work_q_name),
 			 "scsi_wq_%d", shost->host_no);
-		shost->work_q = create_singlethread_workqueue(
-					shost->work_q_name);
+		shost->work_q = alloc_workqueue("%s",
+			WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
+			1, shost->work_q_name);
+
 		if (!shost->work_q) {
 			error = -EINVAL;
 			goto out_free_shost_data;
@@ -487,7 +489,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
 	}
 
 	shost->tmf_work_q = alloc_workqueue("scsi_tmf_%d",
-					    WQ_UNBOUND | WQ_MEM_RECLAIM,
+					WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS,
 					   1, shost->host_no);
 	if (!shost->tmf_work_q) {
 		shost_printk(KERN_WARNING, shost,
-- 
2.9.5

