scsi: libsas: Use new workqueue to run sas event and disco event

Now all libsas works are queued to scsi host workqueue, include sas
event work post by LLDD and sas discovery work, and a sas hotplug flow
may be divided into several works, e.g libsas receive a
PORTE_BYTES_DMAED event, currently we process it as following steps:

sas_form_port  --- run in work in shost workq
	sas_discover_domain  --- run in another work in shost workq
		...
		sas_probe_devices  --- run in new work in shost workq
We found during hot-add a device, libsas may need run several
works in same workqueue to add device in system, the process is
not atomic, it may interrupt by other sas event works, like
PHYE_LOSS_OF_SIGNAL.

This patch is preparation of execute libsas sas event in sync. We need
to use different workqueue to run sas event and disco event. Otherwise
the work will be blocked for waiting another chained work in the same
workqueue.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
CC: John Garry <john.garry@huawei.com>
CC: Johannes Thumshirn <jthumshirn@suse.de>
CC: Ewan Milne <emilne@redhat.com>
CC: Christoph Hellwig <hch@lst.de>
CC: Tomas Henzl <thenzl@redhat.com>
CC: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
index afd928bf903e..c81a63b5dc71 100644
--- a/drivers/scsi/libsas/sas_init.c
+++ b/drivers/scsi/libsas/sas_init.c
@@ -110,6 +110,7 @@ void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
 
 int sas_register_ha(struct sas_ha_struct *sas_ha)
 {
+        char name[64];
         int error = 0;
 
         mutex_init(&sas_ha->disco_mutex);
@@ -143,10 +144,24 @@ int sas_register_ha(struct sas_ha_struct *sas_ha)
                 goto Undo_ports;
         }
 
+        error = -ENOMEM;
+        snprintf(name, sizeof(name), "%s_event_q", dev_name(sas_ha->dev));
+        sas_ha->event_q = create_singlethread_workqueue(name);
+        if (!sas_ha->event_q)
+                goto Undo_ports;
+
+        snprintf(name, sizeof(name), "%s_disco_q", dev_name(sas_ha->dev));
+        sas_ha->disco_q = create_singlethread_workqueue(name);
+        if (!sas_ha->disco_q)
+                goto Undo_event_q;
+
         INIT_LIST_HEAD(&sas_ha->eh_done_q);
         INIT_LIST_HEAD(&sas_ha->eh_ata_q);
 
         return 0;
+
+Undo_event_q:
+        destroy_workqueue(sas_ha->event_q);
 Undo_ports:
         sas_unregister_ports(sas_ha);
 Undo_phys:
@@ -177,6 +192,9 @@ int sas_unregister_ha(struct sas_ha_struct *sas_ha)
         __sas_drain_work(sas_ha);
         mutex_unlock(&sas_ha->drain_mutex);
 
+        destroy_workqueue(sas_ha->disco_q);
+        destroy_workqueue(sas_ha->event_q);
+
         return 0;
 }