[SCSI] qla2xxx: convert to use the data buffer accessors

- remove the unnecessary map_single path.

- convert to use the new accessors for the sg lists and the
parameters.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 82 insertions, 150 deletions

diff --git a/drivers/scsi/qla2xxx/qla_iocb.c b/drivers/scsi/qla2xxx/qla_iocb.c
index c5b3c610a32a..c517a1478e44 100644
--- a/drivers/scsi/qla2xxx/qla_iocb.c
+++ b/drivers/scsi/qla2xxx/qla_iocb.c
@@ -155,6 +155,8 @@ void qla2x00_build_scsi_iocbs_32(srb_t *sp, cmd_entry_t *cmd_pkt,
 	uint32_t	*cur_dsd;
 	scsi_qla_host_t	*ha;
 	struct scsi_cmnd *cmd;
+	struct scatterlist *sg;
+	int i;
 
 	cmd = sp->cmd;
 
@@ -163,7 +165,7 @@ void qla2x00_build_scsi_iocbs_32(srb_t *sp, cmd_entry_t *cmd_pkt,
 	    __constant_cpu_to_le32(COMMAND_TYPE);
 
 	/* No data transfer */
-	if (cmd->request_bufflen == 0 || cmd->sc_data_direction == DMA_NONE) {
+	if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 		cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 		return;
 	}
@@ -177,35 +179,24 @@ void qla2x00_build_scsi_iocbs_32(srb_t *sp, cmd_entry_t *cmd_pkt,
 	cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 
 	/* Load data segments */
-	if (cmd->use_sg != 0) {
-		struct	scatterlist *cur_seg;
-		struct	scatterlist *end_seg;
-
-		cur_seg = (struct scatterlist *)cmd->request_buffer;
-		end_seg = cur_seg + tot_dsds;
-		while (cur_seg < end_seg) {
-			cont_entry_t	*cont_pkt;
-
-			/* Allocate additional continuation packets? */
-			if (avail_dsds == 0) {
-				/*
-				 * Seven DSDs are available in the Continuation
-				 * Type 0 IOCB.
-				 */
-				cont_pkt = qla2x00_prep_cont_type0_iocb(ha);
-				cur_dsd = (uint32_t *)&cont_pkt->dseg_0_address;
-				avail_dsds = 7;
-			}
-
-			*cur_dsd++ = cpu_to_le32(sg_dma_address(cur_seg));
-			*cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
-			avail_dsds--;
-
-			cur_seg++;
+
+	scsi_for_each_sg(cmd, sg, tot_dsds, i) {
+		cont_entry_t *cont_pkt;
+
+		/* Allocate additional continuation packets? */
+		if (avail_dsds == 0) {
+			/*
+			 * Seven DSDs are available in the Continuation
+			 * Type 0 IOCB.
+			 */
+			cont_pkt = qla2x00_prep_cont_type0_iocb(ha);
+			cur_dsd = (uint32_t *)&cont_pkt->dseg_0_address;
+			avail_dsds = 7;
 		}
-	} else {
-		*cur_dsd++ = cpu_to_le32(sp->dma_handle);
-		*cur_dsd++ = cpu_to_le32(cmd->request_bufflen);
+
+		*cur_dsd++ = cpu_to_le32(sg_dma_address(sg));
+		*cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
+		avail_dsds--;
 	}
 }
 
@@ -224,6 +215,8 @@ void qla2x00_build_scsi_iocbs_64(srb_t *sp, cmd_entry_t *cmd_pkt,
 	uint32_t	*cur_dsd;
 	scsi_qla_host_t	*ha;
 	struct scsi_cmnd *cmd;
+	struct scatterlist *sg;
+	int i;
 
 	cmd = sp->cmd;
 
@@ -232,7 +225,7 @@ void qla2x00_build_scsi_iocbs_64(srb_t *sp, cmd_entry_t *cmd_pkt,
 	    __constant_cpu_to_le32(COMMAND_A64_TYPE);
 
 	/* No data transfer */
-	if (cmd->request_bufflen == 0 || cmd->sc_data_direction == DMA_NONE) {
+	if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 		cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 		return;
 	}
@@ -246,39 +239,26 @@ void qla2x00_build_scsi_iocbs_64(srb_t *sp, cmd_entry_t *cmd_pkt,
 	cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 
 	/* Load data segments */
-	if (cmd->use_sg != 0) {
-		struct	scatterlist *cur_seg;
-		struct	scatterlist *end_seg;
-
-		cur_seg = (struct scatterlist *)cmd->request_buffer;
-		end_seg = cur_seg + tot_dsds;
-		while (cur_seg < end_seg) {
-			dma_addr_t	sle_dma;
-			cont_a64_entry_t *cont_pkt;
-
-			/* Allocate additional continuation packets? */
-			if (avail_dsds == 0) {
-				/*
-				 * Five DSDs are available in the Continuation
-				 * Type 1 IOCB.
-				 */
-				cont_pkt = qla2x00_prep_cont_type1_iocb(ha);
-				cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
-				avail_dsds = 5;
-			}
-
-			sle_dma = sg_dma_address(cur_seg);
-			*cur_dsd++ = cpu_to_le32(LSD(sle_dma));
-			*cur_dsd++ = cpu_to_le32(MSD(sle_dma));
-			*cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
-			avail_dsds--;
-
-			cur_seg++;
+	scsi_for_each_sg(cmd, sg, tot_dsds, i) {
+		dma_addr_t	sle_dma;
+		cont_a64_entry_t *cont_pkt;
+
+		/* Allocate additional continuation packets? */
+		if (avail_dsds == 0) {
+			/*
+			 * Five DSDs are available in the Continuation
+			 * Type 1 IOCB.
+			 */
+			cont_pkt = qla2x00_prep_cont_type1_iocb(ha);
+			cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
+			avail_dsds = 5;
 		}
-	} else {
-		*cur_dsd++ = cpu_to_le32(LSD(sp->dma_handle));
-		*cur_dsd++ = cpu_to_le32(MSD(sp->dma_handle));
-		*cur_dsd++ = cpu_to_le32(cmd->request_bufflen);
+
+		sle_dma = sg_dma_address(sg);
+		*cur_dsd++ = cpu_to_le32(LSD(sle_dma));
+		*cur_dsd++ = cpu_to_le32(MSD(sle_dma));
+		*cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
+		avail_dsds--;
 	}
 }
 
@@ -291,7 +271,7 @@ void qla2x00_build_scsi_iocbs_64(srb_t *sp, cmd_entry_t *cmd_pkt,
 int
 qla2x00_start_scsi(srb_t *sp)
 {
-	int		ret;
+	int		ret, nseg;
 	unsigned long   flags;
 	scsi_qla_host_t	*ha;
 	struct scsi_cmnd *cmd;
@@ -299,7 +279,6 @@ qla2x00_start_scsi(srb_t *sp)
 	uint32_t        index;
 	uint32_t	handle;
 	cmd_entry_t	*cmd_pkt;
-	struct scatterlist *sg;
 	uint16_t	cnt;
 	uint16_t	req_cnt;
 	uint16_t	tot_dsds;
@@ -337,23 +316,10 @@ qla2x00_start_scsi(srb_t *sp)
 		goto queuing_error;
 
 	/* Map the sg table so we have an accurate count of sg entries needed */
-	if (cmd->use_sg) {
-		sg = (struct scatterlist *) cmd->request_buffer;
-		tot_dsds = pci_map_sg(ha->pdev, sg, cmd->use_sg,
-		    cmd->sc_data_direction);
-		if (tot_dsds == 0)
-			goto queuing_error;
-	} else if (cmd->request_bufflen) {
-		dma_addr_t	req_dma;
-
-		req_dma = pci_map_single(ha->pdev, cmd->request_buffer,
-		    cmd->request_bufflen, cmd->sc_data_direction);
-		if (dma_mapping_error(req_dma))
-			goto queuing_error;
-
-		sp->dma_handle = req_dma;
-		tot_dsds = 1;
-	}
+	nseg = scsi_dma_map(cmd);
+	if (nseg < 0)
+		goto queuing_error;
+	tot_dsds = nseg;
 
 	/* Calculate the number of request entries needed. */
 	req_cnt = ha->isp_ops.calc_req_entries(tot_dsds);
@@ -391,7 +357,7 @@ qla2x00_start_scsi(srb_t *sp)
 
 	/* Load SCSI command packet. */
 	memcpy(cmd_pkt->scsi_cdb, cmd->cmnd, cmd->cmd_len);
-	cmd_pkt->byte_count = cpu_to_le32((uint32_t)cmd->request_bufflen);
+	cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
 
 	/* Build IOCB segments */
 	ha->isp_ops.build_iocbs(sp, cmd_pkt, tot_dsds);
@@ -423,14 +389,9 @@ qla2x00_start_scsi(srb_t *sp)
 	return (QLA_SUCCESS);
 
 queuing_error:
-	if (cmd->use_sg && tot_dsds) {
-		sg = (struct scatterlist *) cmd->request_buffer;
-		pci_unmap_sg(ha->pdev, sg, cmd->use_sg,
-		    cmd->sc_data_direction);
-	} else if (tot_dsds) {
-		pci_unmap_single(ha->pdev, sp->dma_handle,
-		    cmd->request_bufflen, cmd->sc_data_direction);
-	}
+	if (tot_dsds)
+		scsi_dma_unmap(cmd);
+
 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
 
 	return (QLA_FUNCTION_FAILED);
@@ -642,6 +603,8 @@ qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
 	uint32_t	*cur_dsd;
 	scsi_qla_host_t	*ha;
 	struct scsi_cmnd *cmd;
+	struct scatterlist *sg;
+	int i;
 
 	cmd = sp->cmd;
 
@@ -650,7 +613,7 @@ qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
 	    __constant_cpu_to_le32(COMMAND_TYPE_7);
 
 	/* No data transfer */
-	if (cmd->request_bufflen == 0 || cmd->sc_data_direction == DMA_NONE) {
+	if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
 		cmd_pkt->byte_count = __constant_cpu_to_le32(0);
 		return;
 	}
@@ -670,39 +633,27 @@ qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
 	cur_dsd = (uint32_t *)&cmd_pkt->dseg_0_address;
 
 	/* Load data segments */
-	if (cmd->use_sg != 0) {
-		struct	scatterlist *cur_seg;
-		struct	scatterlist *end_seg;
-
-		cur_seg = (struct scatterlist *)cmd->request_buffer;
-		end_seg = cur_seg + tot_dsds;
-		while (cur_seg < end_seg) {
-			dma_addr_t	sle_dma;
-			cont_a64_entry_t *cont_pkt;
-
-			/* Allocate additional continuation packets? */
-			if (avail_dsds == 0) {
-				/*
-				 * Five DSDs are available in the Continuation
-				 * Type 1 IOCB.
-				 */
-				cont_pkt = qla2x00_prep_cont_type1_iocb(ha);
-				cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
-				avail_dsds = 5;
-			}
-
-			sle_dma = sg_dma_address(cur_seg);
-			*cur_dsd++ = cpu_to_le32(LSD(sle_dma));
-			*cur_dsd++ = cpu_to_le32(MSD(sle_dma));
-			*cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
-			avail_dsds--;
-
-			cur_seg++;
+
+	scsi_for_each_sg(cmd, sg, tot_dsds, i) {
+		dma_addr_t	sle_dma;
+		cont_a64_entry_t *cont_pkt;
+
+		/* Allocate additional continuation packets? */
+		if (avail_dsds == 0) {
+			/*
+			 * Five DSDs are available in the Continuation
+			 * Type 1 IOCB.
+			 */
+			cont_pkt = qla2x00_prep_cont_type1_iocb(ha);
+			cur_dsd = (uint32_t *)cont_pkt->dseg_0_address;
+			avail_dsds = 5;
 		}
-	} else {
-		*cur_dsd++ = cpu_to_le32(LSD(sp->dma_handle));
-		*cur_dsd++ = cpu_to_le32(MSD(sp->dma_handle));
-		*cur_dsd++ = cpu_to_le32(cmd->request_bufflen);
+
+		sle_dma = sg_dma_address(sg);
+		*cur_dsd++ = cpu_to_le32(LSD(sle_dma));
+		*cur_dsd++ = cpu_to_le32(MSD(sle_dma));
+		*cur_dsd++ = cpu_to_le32(sg_dma_len(sg));
+		avail_dsds--;
 	}
 }
 
@@ -716,7 +667,7 @@ qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
 int
 qla24xx_start_scsi(srb_t *sp)
 {
-	int		ret;
+	int		ret, nseg;
 	unsigned long   flags;
 	scsi_qla_host_t	*ha;
 	struct scsi_cmnd *cmd;
@@ -724,7 +675,6 @@ qla24xx_start_scsi(srb_t *sp)
 	uint32_t        index;
 	uint32_t	handle;
 	struct cmd_type_7 *cmd_pkt;
-	struct scatterlist *sg;
 	uint16_t	cnt;
 	uint16_t	req_cnt;
 	uint16_t	tot_dsds;
@@ -762,23 +712,10 @@ qla24xx_start_scsi(srb_t *sp)
 		goto queuing_error;
 
 	/* Map the sg table so we have an accurate count of sg entries needed */
-	if (cmd->use_sg) {
-		sg = (struct scatterlist *) cmd->request_buffer;
-		tot_dsds = pci_map_sg(ha->pdev, sg, cmd->use_sg,
-		    cmd->sc_data_direction);
-		if (tot_dsds == 0)
+	nseg = scsi_dma_map(cmd);
+	if (nseg < 0)
 			goto queuing_error;
-	} else if (cmd->request_bufflen) {
-		dma_addr_t      req_dma;
-
-		req_dma = pci_map_single(ha->pdev, cmd->request_buffer,
-		    cmd->request_bufflen, cmd->sc_data_direction);
-		if (dma_mapping_error(req_dma))
-			goto queuing_error;
-
-		sp->dma_handle = req_dma;
-		tot_dsds = 1;
-	}
+	tot_dsds = nseg;
 
 	req_cnt = qla24xx_calc_iocbs(tot_dsds);
 	if (ha->req_q_cnt < (req_cnt + 2)) {
@@ -821,7 +758,7 @@ qla24xx_start_scsi(srb_t *sp)
 	memcpy(cmd_pkt->fcp_cdb, cmd->cmnd, cmd->cmd_len);
 	host_to_fcp_swap(cmd_pkt->fcp_cdb, sizeof(cmd_pkt->fcp_cdb));
 
-	cmd_pkt->byte_count = cpu_to_le32((uint32_t)cmd->request_bufflen);
+	cmd_pkt->byte_count = cpu_to_le32((uint32_t)scsi_bufflen(cmd));
 
 	/* Build IOCB segments */
 	qla24xx_build_scsi_iocbs(sp, cmd_pkt, tot_dsds);
@@ -853,14 +790,9 @@ qla24xx_start_scsi(srb_t *sp)
 	return QLA_SUCCESS;
 
 queuing_error:
-	if (cmd->use_sg && tot_dsds) {
-		sg = (struct scatterlist *) cmd->request_buffer;
-		pci_unmap_sg(ha->pdev, sg, cmd->use_sg,
-		    cmd->sc_data_direction);
-	} else if (tot_dsds) {
-		pci_unmap_single(ha->pdev, sp->dma_handle,
-		    cmd->request_bufflen, cmd->sc_data_direction);
-	}
+	if (tot_dsds)
+		scsi_dma_unmap(cmd);
+
 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
 
 	return QLA_FUNCTION_FAILED;