[SCSI] pm8001: raise host can queue

This is a followup to a patch provided by Jack Wang on September 21 2011.

After increasing the CAN_QUEUE to 510 in pm8001 we discovered some performance
degredation from time to time. We needed to increase the MPI queue to
compensate and ensure we never hit that limit. We also needed to double
the margin to support event and administrivial commands that take from
the pool resulting in an occasional largely unproductive command completion
with soft error to the caller when the command pool is overloaded temporarily.

Signed-off-by: Mark Salyzyn <mark_salyzyn@xyratex.com>
Acked-by: Jack Wang <jack_wang@usish.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

3 files changed, 17 insertions, 13 deletions

diff --git a/drivers/scsi/pm8001/pm8001_defs.h b/drivers/scsi/pm8001/pm8001_defs.h
index 944afada61ee..c3d20c8d4abe 100644
--- a/drivers/scsi/pm8001/pm8001_defs.h
+++ b/drivers/scsi/pm8001/pm8001_defs.h
@@ -66,9 +66,10 @@ enum port_type {
 
 /* driver compile-time configuration */
 #define	PM8001_MAX_CCB		 512	/* max ccbs supported */
+#define PM8001_MPI_QUEUE         1024   /* maximum mpi queue entries */
 #define	PM8001_MAX_INB_NUM	 1
 #define	PM8001_MAX_OUTB_NUM	 1
-#define	PM8001_CAN_QUEUE	 128	/* SCSI Queue depth */
+#define	PM8001_CAN_QUEUE	 508	/* SCSI Queue depth */
 
 /* unchangeable hardware details */
 #define	PM8001_MAX_PHYS		 8	/* max. possible phys */
diff --git a/drivers/scsi/pm8001/pm8001_hwi.c b/drivers/scsi/pm8001/pm8001_hwi.c
index 2da0accf1a51..bf54aafc2d71 100644
--- a/drivers/scsi/pm8001/pm8001_hwi.c
+++ b/drivers/scsi/pm8001/pm8001_hwi.c
@@ -192,7 +192,7 @@ init_default_table_values(struct pm8001_hba_info *pm8001_ha)
 	pm8001_ha->main_cfg_tbl.fatal_err_interrupt		= 0x01;
 	for (i = 0; i < qn; i++) {
 		pm8001_ha->inbnd_q_tbl[i].element_pri_size_cnt	=
-			0x00000100 | (0x00000040 << 16) | (0x00<<30);
+			PM8001_MPI_QUEUE | (64 << 16) | (0x00<<30);
 		pm8001_ha->inbnd_q_tbl[i].upper_base_addr	=
 			pm8001_ha->memoryMap.region[IB].phys_addr_hi;
 		pm8001_ha->inbnd_q_tbl[i].lower_base_addr	=
@@ -218,7 +218,7 @@ init_default_table_values(struct pm8001_hba_info *pm8001_ha)
 	}
 	for (i = 0; i < qn; i++) {
 		pm8001_ha->outbnd_q_tbl[i].element_size_cnt	=
-			256 | (64 << 16) | (1<<30);
+			PM8001_MPI_QUEUE | (64 << 16) | (0x01<<30);
 		pm8001_ha->outbnd_q_tbl[i].upper_base_addr	=
 			pm8001_ha->memoryMap.region[OB].phys_addr_hi;
 		pm8001_ha->outbnd_q_tbl[i].lower_base_addr	=
@@ -1245,7 +1245,7 @@ static int mpi_msg_free_get(struct inbound_queue_table *circularQ,
 	/* Stores the new consumer index */
 	consumer_index = pm8001_read_32(circularQ->ci_virt);
 	circularQ->consumer_index = cpu_to_le32(consumer_index);
-	if (((circularQ->producer_idx + bcCount) % 256) ==
+	if (((circularQ->producer_idx + bcCount) % PM8001_MPI_QUEUE) ==
 		le32_to_cpu(circularQ->consumer_index)) {
 		*messagePtr = NULL;
 		return -1;
@@ -1253,7 +1253,8 @@ static int mpi_msg_free_get(struct inbound_queue_table *circularQ,
 	/* get memory IOMB buffer address */
 	offset = circularQ->producer_idx * 64;
 	/* increment to next bcCount element */
-	circularQ->producer_idx = (circularQ->producer_idx + bcCount) % 256;
+	circularQ->producer_idx = (circularQ->producer_idx + bcCount)
+				% PM8001_MPI_QUEUE;
 	/* Adds that distance to the base of the region virtual address plus
 	the message header size*/
 	msgHeader = (struct mpi_msg_hdr *)(circularQ->base_virt	+ offset);
@@ -1326,7 +1327,8 @@ static u32 mpi_msg_free_set(struct pm8001_hba_info *pm8001_ha, void *pMsg,
 		return 0;
 	}
 	/* free the circular queue buffer elements associated with the message*/
-	circularQ->consumer_idx = (circularQ->consumer_idx + bc) % 256;
+	circularQ->consumer_idx = (circularQ->consumer_idx + bc)
+				% PM8001_MPI_QUEUE;
 	/* update the CI of outbound queue */
 	pm8001_cw32(pm8001_ha, circularQ->ci_pci_bar, circularQ->ci_offset,
 		circularQ->consumer_idx);
@@ -1383,7 +1385,8 @@ static u32 mpi_msg_consume(struct pm8001_hba_info *pm8001_ha,
 					circularQ->consumer_idx =
 						(circularQ->consumer_idx +
 						((le32_to_cpu(msgHeader_tmp)
-						>> 24) & 0x1f)) % 256;
+						 >> 24) & 0x1f))
+							% PM8001_MPI_QUEUE;
 					msgHeader_tmp = 0;
 					pm8001_write_32(msgHeader, 0, 0);
 					/* update the CI of outbound queue */
@@ -1396,7 +1399,7 @@ static u32 mpi_msg_consume(struct pm8001_hba_info *pm8001_ha,
 				circularQ->consumer_idx =
 					(circularQ->consumer_idx +
 					((le32_to_cpu(msgHeader_tmp) >> 24) &
-					0x1f)) % 256;
+					0x1f)) % PM8001_MPI_QUEUE;
 				msgHeader_tmp = 0;
 				pm8001_write_32(msgHeader, 0, 0);
 				/* update the CI of outbound queue */
diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c
index 36efaa7c3a54..0267c22f8741 100644
--- a/drivers/scsi/pm8001/pm8001_init.c
+++ b/drivers/scsi/pm8001/pm8001_init.c
@@ -235,15 +235,15 @@ static int __devinit pm8001_alloc(struct pm8001_hba_info *pm8001_ha)
 	pm8001_ha->memoryMap.region[PI].alignment = 4;
 
 	/* MPI Memory region 5 inbound queues */
-	pm8001_ha->memoryMap.region[IB].num_elements = 256;
+	pm8001_ha->memoryMap.region[IB].num_elements = PM8001_MPI_QUEUE;
 	pm8001_ha->memoryMap.region[IB].element_size = 64;
-	pm8001_ha->memoryMap.region[IB].total_len = 256 * 64;
+	pm8001_ha->memoryMap.region[IB].total_len = PM8001_MPI_QUEUE * 64;
 	pm8001_ha->memoryMap.region[IB].alignment = 64;
 
-	/* MPI Memory region 6 inbound queues */
-	pm8001_ha->memoryMap.region[OB].num_elements = 256;
+	/* MPI Memory region 6 outbound queues */
+	pm8001_ha->memoryMap.region[OB].num_elements = PM8001_MPI_QUEUE;
 	pm8001_ha->memoryMap.region[OB].element_size = 64;
-	pm8001_ha->memoryMap.region[OB].total_len = 256 * 64;
+	pm8001_ha->memoryMap.region[OB].total_len = PM8001_MPI_QUEUE * 64;
 	pm8001_ha->memoryMap.region[OB].alignment = 64;
 
 	/* Memory region write DMA*/