[PATCH v4 8/8] pm80xx: remove global lock from outbound queue processing

[Viswas G <Viswas.G@xxxxxxxxxxxxx>]

Introduced spin lock for outbound queue. With this, driver need not
acquire hba global lock for outbound queue processing.

Signed-off-by: Viswas G <Viswas.G@xxxxxxxxxxxxx>
Signed-off-by: Ruksar Devadi <Ruksar.devadi@xxxxxxxxxxxxx>
Signed-off-by: Ashokkumar N <Ashokkumar.N@xxxxxxxxxxxxx>
Acked-by: Jack Wang <jinpu.wang@xxxxxxxxxxxxxxx>
---
 drivers/scsi/pm8001/pm8001_init.c | 9 ++++++---
 drivers/scsi/pm8001/pm8001_sas.h  | 1 +
 drivers/scsi/pm8001/pm80xx_hwi.c  | 4 ++--
 3 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c
index bd626ef876da..a3c8fb9a885f 100644
--- a/drivers/scsi/pm8001/pm8001_init.c
+++ b/drivers/scsi/pm8001/pm8001_init.c
@@ -267,7 +267,8 @@ static int pm8001_alloc(struct pm8001_hba_info *pm8001_ha,
 {
 	int i, count = 0, rc = 0;
 	u32 ci_offset, ib_offset, ob_offset, pi_offset;
-	struct inbound_queue_table *circularQ;
+	struct inbound_queue_table *ibq;
+	struct outbound_queue_table *obq;
 
 	spin_lock_init(&pm8001_ha->lock);
 	spin_lock_init(&pm8001_ha->bitmap_lock);
@@ -315,8 +316,8 @@ static int pm8001_alloc(struct pm8001_hba_info *pm8001_ha,
 	pm8001_ha->memoryMap.region[IOP].alignment = 32;
 
 	for (i = 0; i < count; i++) {
-		circularQ = &pm8001_ha->inbnd_q_tbl[i];
-		spin_lock_init(&circularQ->iq_lock);
+		ibq = &pm8001_ha->inbnd_q_tbl[i];
+		spin_lock_init(&ibq->iq_lock);
 		/* MPI Memory region 3 for consumer Index of inbound queues */
 		pm8001_ha->memoryMap.region[ci_offset+i].num_elements = 1;
 		pm8001_ha->memoryMap.region[ci_offset+i].element_size = 4;
@@ -345,6 +346,8 @@ static int pm8001_alloc(struct pm8001_hba_info *pm8001_ha,
 	}
 
 	for (i = 0; i < count; i++) {
+		obq = &pm8001_ha->outbnd_q_tbl[i];
+		spin_lock_init(&obq->oq_lock);
 		/* MPI Memory region 4 for producer Index of outbound queues */
 		pm8001_ha->memoryMap.region[pi_offset+i].num_elements = 1;
 		pm8001_ha->memoryMap.region[pi_offset+i].element_size = 4;
diff --git a/drivers/scsi/pm8001/pm8001_sas.h b/drivers/scsi/pm8001/pm8001_sas.h
index 36cd37c8c29a..f835557ee354 100644
--- a/drivers/scsi/pm8001/pm8001_sas.h
+++ b/drivers/scsi/pm8001/pm8001_sas.h
@@ -457,6 +457,7 @@ struct outbound_queue_table {
 	u32			dinterrup_to_pci_offset;
 	__le32			producer_index;
 	u32			consumer_idx;
+	spinlock_t		oq_lock;
 };
 struct pm8001_hba_memspace {
 	void __iomem  		*memvirtaddr;
diff --git a/drivers/scsi/pm8001/pm80xx_hwi.c b/drivers/scsi/pm8001/pm80xx_hwi.c
index 0f2c57e054ac..f1276baebe1d 100644
--- a/drivers/scsi/pm8001/pm80xx_hwi.c
+++ b/drivers/scsi/pm8001/pm80xx_hwi.c
@@ -4133,8 +4133,8 @@ static int process_oq(struct pm8001_hba_info *pm8001_ha, u8 vec)
 			return ret;
 		}
 	}
-	spin_lock_irqsave(&pm8001_ha->lock, flags);
 	circularQ = &pm8001_ha->outbnd_q_tbl[vec];
+	spin_lock_irqsave(&circularQ->oq_lock, flags);
 	do {
 		/* spurious interrupt during setup if kexec-ing and
 		 * driver doing a doorbell access w/ the pre-kexec oq
@@ -4160,7 +4160,7 @@ static int process_oq(struct pm8001_hba_info *pm8001_ha, u8 vec)
 				break;
 		}
 	} while (1);
-	spin_unlock_irqrestore(&pm8001_ha->lock, flags);
+	spin_unlock_irqrestore(&circularQ->oq_lock, flags);
 	return ret;
 }
 
-- 
2.16.3