[SCSI] qla2xxx: Refactor request/response-queue register handling.

Original code used an overabundance of indirect pointers to
function helpers.  Instead, the driver can exploit the immutable
properties of a queue's ISP-association and ID, which are both
known at queue initialization-time.
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/qla2xxx/qla_def.h

@@ -372,10 +372,10 @@ struct device_reg_2xxx {
 };
 
 struct device_reg_25xxmq {
-	volatile uint32_t req_q_in;
-	volatile uint32_t req_q_out;
-	volatile uint32_t rsp_q_in;
-	volatile uint32_t rsp_q_out;
+	uint32_t req_q_in;
+	uint32_t req_q_out;
+	uint32_t rsp_q_in;
+	uint32_t rsp_q_out;
 };
 
 typedef union {
@@ -2102,9 +2102,6 @@ struct isp_operations {
 
 	int (*get_flash_version) (struct scsi_qla_host *, void *);
 	int (*start_scsi) (srb_t *);
-	void (*wrt_req_reg) (struct qla_hw_data *, uint16_t, uint16_t);
-	void (*wrt_rsp_reg) (struct qla_hw_data *, uint16_t, uint16_t);
-	uint16_t (*rd_req_reg) (struct qla_hw_data *, uint16_t);
 };
 
 /* MSI-X Support *************************************************************/
@@ -2200,6 +2197,8 @@ struct rsp_que {
 	dma_addr_t  dma;
 	response_t *ring;
 	response_t *ring_ptr;
+	uint32_t __iomem *rsp_q_in;	/* FWI2-capable only. */
+	uint32_t __iomem *rsp_q_out;
 	uint16_t  ring_index;
 	uint16_t  out_ptr;
 	uint16_t  length;
@@ -2217,6 +2216,8 @@ struct req_que {
 	dma_addr_t  dma;
 	request_t *ring;
 	request_t *ring_ptr;
+	uint32_t __iomem *req_q_in;	/* FWI2-capable only. */
+	uint32_t __iomem *req_q_out;
 	uint16_t  ring_index;
 	uint16_t  in_ptr;
 	uint16_t  cnt;
@@ -2277,7 +2278,7 @@ struct qla_hw_data {
 
 #define MIN_IOBASE_LEN          0x100
 /* Multi queue data structs */
-	device_reg_t    *mqiobase;
+	device_reg_t __iomem *mqiobase;
 	uint16_t        msix_count;
 	uint8_t         mqenable;
 	struct req_que **req_q_map;

drivers/scsi/qla2xxx/qla_iocb.c

@@ -776,7 +776,7 @@ qla24xx_start_scsi(srb_t *sp)
 
 	req_cnt = qla24xx_calc_iocbs(tot_dsds);
 	if (req->cnt < (req_cnt + 2)) {
-		cnt = ha->isp_ops->rd_req_reg(ha, req->id);
+		cnt = RD_REG_DWORD_RELAXED(req->req_q_out);
 
 		if (req->ring_index < cnt)
 			req->cnt = cnt - req->ring_index;
@@ -836,7 +836,8 @@ qla24xx_start_scsi(srb_t *sp)
 	sp->flags |= SRB_DMA_VALID;
 
 	/* Set chip new ring index. */
-	ha->isp_ops->wrt_req_reg(ha, req->id, req->ring_index);
+	WRT_REG_DWORD(req->req_q_in, req->ring_index);
+	RD_REG_DWORD_RELAXED(&ha->iobase->isp24.hccr);
 
 	/* Manage unprocessed RIO/ZIO commands in response queue. */
 	if (vha->flags.process_response_queue &&
@@ -854,35 +855,3 @@ qla24xx_start_scsi(srb_t *sp)
 
 	return QLA_FUNCTION_FAILED;
 }
-
-uint16_t
-qla24xx_rd_req_reg(struct qla_hw_data *ha, uint16_t id)
-{
-	device_reg_t __iomem *reg = (void *) ha->iobase;
-	return RD_REG_DWORD_RELAXED(&reg->isp24.req_q_out);
-}
-
-uint16_t
-qla25xx_rd_req_reg(struct qla_hw_data *ha, uint16_t id)
-{
-	device_reg_t __iomem *reg = (void *) ha->mqiobase + QLA_QUE_PAGE * id;
-	return RD_REG_DWORD_RELAXED(&reg->isp25mq.req_q_out);
-}
-
-void
-qla24xx_wrt_req_reg(struct qla_hw_data *ha, uint16_t id, uint16_t index)
-{
-	device_reg_t __iomem *reg = (void *) ha->iobase;
-	WRT_REG_DWORD(&reg->isp24.req_q_in, index);
-	RD_REG_DWORD_RELAXED(&reg->isp24.req_q_in);
-}
-
-void
-qla25xx_wrt_req_reg(struct qla_hw_data *ha, uint16_t id, uint16_t index)
-{
-	device_reg_t __iomem *reg = (void *) ha->mqiobase + QLA_QUE_PAGE * id;
-	struct device_reg_2xxx __iomem *ioreg = &ha->iobase->isp;
-	WRT_REG_DWORD(&reg->isp25mq.req_q_in, index);
-	RD_REG_DWORD(&ioreg->hccr); /* PCI posting */
-}
-

drivers/scsi/qla2xxx/qla_isr.c

@@ -1499,7 +1499,6 @@ qla24xx_mbx_completion(scsi_qla_host_t *vha, uint16_t mb0)
 void
 qla24xx_process_response_queue(struct rsp_que *rsp)
 {
-	struct qla_hw_data *ha = rsp->hw;
 	struct sts_entry_24xx *pkt;
 	struct scsi_qla_host *vha;
 
@@ -1553,7 +1552,7 @@ qla24xx_process_response_queue(struct rsp_que *rsp)
 	}
 
 	/* Adjust ring index */
-	ha->isp_ops->wrt_rsp_reg(ha, rsp->id, rsp->ring_index);
+	WRT_REG_DWORD(rsp->rsp_q_out, rsp->ring_index);
 }
 
 static void
@@ -2117,18 +2116,3 @@ int qla25xx_request_irq(struct rsp_que *rsp)
 	msix->rsp = rsp;
 	return ret;
 }
-
-void
-qla25xx_wrt_rsp_reg(struct qla_hw_data *ha, uint16_t id, uint16_t index)
-{
-	device_reg_t __iomem *reg = (void *) ha->mqiobase + QLA_QUE_PAGE * id;
-	WRT_REG_DWORD(&reg->isp25mq.rsp_q_out, index);
-}
-
-void
-qla24xx_wrt_rsp_reg(struct qla_hw_data *ha, uint16_t id, uint16_t index)
-{
-	device_reg_t __iomem *reg = (void *) ha->iobase;
-	WRT_REG_DWORD(&reg->isp24.rsp_q_out, index);
-}
-

drivers/scsi/qla2xxx/qla_mid.c

@@ -584,6 +584,7 @@ qla25xx_create_req_que(struct qla_hw_data *ha, uint16_t options,
 	struct req_que *req = NULL;
 	struct scsi_qla_host *base_vha = pci_get_drvdata(ha->pdev);
 	uint16_t que_id = 0;
+	device_reg_t __iomem *reg;
 
 	req = kzalloc(sizeof(struct req_que), GFP_KERNEL);
 	if (req == NULL) {
@@ -631,6 +632,9 @@ qla25xx_create_req_que(struct qla_hw_data *ha, uint16_t options,
 	req->ring_index = 0;
 	req->cnt = req->length;
 	req->id = que_id;
+	reg = ISP_QUE_REG(ha, que_id);
+	req->req_q_in = &reg->isp25mq.req_q_in;
+	req->req_q_out = &reg->isp25mq.req_q_out;
 	req->max_q_depth = ha->req_q_map[0]->max_q_depth;
 	mutex_unlock(&ha->vport_lock);
 
@@ -658,7 +662,8 @@ qla25xx_create_rsp_que(struct qla_hw_data *ha, uint16_t options,
 	int ret = 0;
 	struct rsp_que *rsp = NULL;
 	struct scsi_qla_host *base_vha = pci_get_drvdata(ha->pdev);
-	uint16_t que_id = 0;;
+	uint16_t que_id = 0;
+	device_reg_t __iomem *reg;
 
 	rsp = kzalloc(sizeof(struct rsp_que), GFP_KERNEL);
 	if (rsp == NULL) {
@@ -706,6 +711,9 @@ qla25xx_create_rsp_que(struct qla_hw_data *ha, uint16_t options,
 	rsp->ring_ptr = rsp->ring;
 	rsp->ring_index = 0;
 	rsp->id = que_id;
+	reg = ISP_QUE_REG(ha, que_id);
+	rsp->rsp_q_in = &reg->isp25mq.rsp_q_in;
+	rsp->rsp_q_out = &reg->isp25mq.rsp_q_out;
 	mutex_unlock(&ha->vport_lock);
 
 	ret = qla25xx_request_irq(rsp);

drivers/scsi/qla2xxx/qla_os.c

@@ -1351,9 +1351,6 @@ static struct isp_operations qla2100_isp_ops = {
 	.write_optrom		= qla2x00_write_optrom_data,
 	.get_flash_version	= qla2x00_get_flash_version,
 	.start_scsi		= qla2x00_start_scsi,
-	.wrt_req_reg		= NULL,
-	.wrt_rsp_reg		= NULL,
-	.rd_req_reg		= NULL,
 };
 
 static struct isp_operations qla2300_isp_ops = {
@@ -1389,9 +1386,6 @@ static struct isp_operations qla2300_isp_ops = {
 	.write_optrom		= qla2x00_write_optrom_data,
 	.get_flash_version	= qla2x00_get_flash_version,
 	.start_scsi		= qla2x00_start_scsi,
-	.wrt_req_reg		= NULL,
-	.wrt_rsp_reg		= NULL,
-	.rd_req_reg		= NULL,
 };
 
 static struct isp_operations qla24xx_isp_ops = {
@@ -1427,9 +1421,6 @@ static struct isp_operations qla24xx_isp_ops = {
 	.write_optrom		= qla24xx_write_optrom_data,
 	.get_flash_version	= qla24xx_get_flash_version,
 	.start_scsi		= qla24xx_start_scsi,
-	.wrt_req_reg		= qla24xx_wrt_req_reg,
-	.wrt_rsp_reg		= qla24xx_wrt_rsp_reg,
-	.rd_req_reg		= qla24xx_rd_req_reg,
 };
 
 static struct isp_operations qla25xx_isp_ops = {
@@ -1465,9 +1456,6 @@ static struct isp_operations qla25xx_isp_ops = {
 	.write_optrom		= qla24xx_write_optrom_data,
 	.get_flash_version	= qla24xx_get_flash_version,
 	.start_scsi		= qla24xx_start_scsi,
-	.wrt_req_reg		= qla24xx_wrt_req_reg,
-	.wrt_rsp_reg		= qla24xx_wrt_rsp_reg,
-	.rd_req_reg		= qla24xx_rd_req_reg,
 };
 
 static struct isp_operations qla81xx_isp_ops = {
@@ -1503,9 +1491,6 @@ static struct isp_operations qla81xx_isp_ops = {
 	.write_optrom		= qla24xx_write_optrom_data,
 	.get_flash_version	= qla24xx_get_flash_version,
 	.start_scsi		= qla24xx_start_scsi,
-	.wrt_req_reg		= qla24xx_wrt_req_reg,
-	.wrt_rsp_reg		= qla24xx_wrt_rsp_reg,
-	.rd_req_reg		= qla24xx_rd_req_reg,
 };
 
 static inline void
@@ -1927,10 +1912,16 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 	ha->rsp_q_map[0] = rsp;
 	ha->req_q_map[0] = req;
 
+	/* FWI2-capable only. */
+	req->req_q_in = &ha->iobase->isp24.req_q_in;
+	req->req_q_out = &ha->iobase->isp24.req_q_out;
+	rsp->rsp_q_in = &ha->iobase->isp24.rsp_q_in;
+	rsp->rsp_q_out = &ha->iobase->isp24.rsp_q_out;
 	if (ha->mqenable) {
-		ha->isp_ops->wrt_req_reg = qla25xx_wrt_req_reg;
-		ha->isp_ops->wrt_rsp_reg = qla25xx_wrt_rsp_reg;
-		ha->isp_ops->rd_req_reg = qla25xx_rd_req_reg;
+		req->req_q_in = &ha->mqiobase->isp25mq.req_q_in;
+		req->req_q_out = &ha->mqiobase->isp25mq.req_q_out;
+		rsp->rsp_q_in = &ha->mqiobase->isp25mq.rsp_q_in;
+		rsp->rsp_q_out =  &ha->mqiobase->isp25mq.rsp_q_out;
 	}
 
 	if (qla2x00_initialize_adapter(base_vha)) {