[PATCH v2 7/7] pm80xx: remove global lock from outbound queue processing

Viswas G
2021-03-24T16:55:06Z

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@microchip.com>
Signed-off-by: Ruksar Devadi <Ruksar.devadi@microchip.com>
Signed-off-by: Ashokkumar N <Ashokkumar.N@microchip.com>
Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com>
---
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