linux-kernel - [PATCH 2/2] scsi: register sysfs for scsi/iscsi workqueues

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Message-Id: <20200611100717.27506-2-bob.liu@oracle.com>
Date:   Thu, 11 Jun 2020 18:07:17 +0800
From:   Bob Liu <bob.liu@...cle.com>
To:     linux-kernel@...r.kernel.org
Cc:     tj@...nel.org, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org, open-iscsi@...glegroups.com,
        lduncan@...e.com, michael.christie@...cle.com,
        Bob Liu <bob.liu@...cle.com>
Subject: [PATCH 2/2] scsi: register sysfs for scsi/iscsi workqueues

This patch enable setting cpu affinity through "cpumask" for below
scsi/iscsi workqueues, so as to get better isolation.
- scsi_wq_*
- scsi_tmf_*
- iscsi_q_xx
- iscsi_eh

Signed-off-by: Bob Liu <bob.liu@...cle.com>
---
 drivers/scsi/hosts.c                | 4 ++--
 drivers/scsi/libiscsi.c             | 2 +-
 drivers/scsi/scsi_transport_iscsi.c | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 1d669e4..4b9f80d 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -272,7 +272,7 @@ 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 = create_singlethread_workqueue_noorder(
 					shost->work_q_name);
 		if (!shost->work_q) {
 			error = -EINVAL;
@@ -487,7 +487,7 @@ 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 | __WQ_ORDERED_DISABLE,
 					   1, shost->host_no);
 	if (!shost->tmf_work_q) {
 		shost_printk(KERN_WARNING, shost,
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 70b99c0..6808cf3 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -2627,7 +2627,7 @@ struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
 	if (xmit_can_sleep) {
 		snprintf(ihost->workq_name, sizeof(ihost->workq_name),
 			"iscsi_q_%d", shost->host_no);
-		ihost->workq = create_singlethread_workqueue(ihost->workq_name);
+		ihost->workq = create_singlethread_workqueue_noorder(ihost->workq_name);
 		if (!ihost->workq)
 			goto free_host;
 	}
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index dfc726f..d07a0e4 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -4602,7 +4602,7 @@ static __init int iscsi_transport_init(void)
 		goto unregister_flashnode_bus;
 	}
 
-	iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
+	iscsi_eh_timer_workq = create_singlethread_workqueue_noorder("iscsi_eh");
 	if (!iscsi_eh_timer_workq) {
 		err = -ENOMEM;
 		goto release_nls;
-- 
2.9.5