scsi: initio: Stop using the SCSI pointer

Set .cmd_size in the SCSI host template instead of using the SCSI pointer
from struct scsi_cmnd. This patch prepares for removal of the SCSI pointer
from struct scsi_cmnd.

Link: https://lore.kernel.org/r/20220218195117.25689-27-bvanassche@acm.orgReviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/initio.c

@@ -2553,7 +2553,7 @@ static void initio_build_scb(struct initio_host * host, struct scsi_ctrl_blk * c
 				  SENSE_SIZE, DMA_FROM_DEVICE);
 	cblk->senseptr = (u32)dma_addr;
 	cblk->senselen = SENSE_SIZE;
-	cmnd->SCp.ptr = (char *)(unsigned long)dma_addr;
+	initio_priv(cmnd)->sense_dma_addr = dma_addr;
 	cblk->cdblen = cmnd->cmd_len;
 
 	/* Clear the returned status */
@@ -2577,7 +2577,7 @@ static void initio_build_scb(struct initio_host * host, struct scsi_ctrl_blk * c
 					  sizeof(struct sg_entry) * TOTAL_SG_ENTRY,
 					  DMA_BIDIRECTIONAL);
 		cblk->bufptr = (u32)dma_addr;
-		cmnd->SCp.dma_handle = dma_addr;
+		initio_priv(cmnd)->sglist_dma_addr = dma_addr;
 
 		cblk->sglen = nseg;
 
@@ -2704,16 +2704,17 @@ static int i91u_biosparam(struct scsi_device *sdev, struct block_device *dev,
 static void i91u_unmap_scb(struct pci_dev *pci_dev, struct scsi_cmnd *cmnd)
 {
 	/* auto sense buffer */
-	if (cmnd->SCp.ptr) {
+	if (initio_priv(cmnd)->sense_dma_addr) {
 		dma_unmap_single(&pci_dev->dev,
-				 (dma_addr_t)((unsigned long)cmnd->SCp.ptr),
+				 initio_priv(cmnd)->sense_dma_addr,
 				 SENSE_SIZE, DMA_FROM_DEVICE);
-		cmnd->SCp.ptr = NULL;
+		initio_priv(cmnd)->sense_dma_addr = 0;
 	}
 
 	/* request buffer */
 	if (scsi_sg_count(cmnd)) {
-		dma_unmap_single(&pci_dev->dev, cmnd->SCp.dma_handle,
+		dma_unmap_single(&pci_dev->dev,
+				 initio_priv(cmnd)->sglist_dma_addr,
 				 sizeof(struct sg_entry) * TOTAL_SG_ENTRY,
 				 DMA_BIDIRECTIONAL);
 
@@ -2796,6 +2797,7 @@ static struct scsi_host_template initio_template = {
 	.can_queue		= MAX_TARGETS * i91u_MAXQUEUE,
 	.this_id		= 1,
 	.sg_tablesize		= SG_ALL,
+	.cmd_size		= sizeof(struct initio_cmd_priv),
 };
 
 static int initio_probe_one(struct pci_dev *pdev,

drivers/scsi/initio.h

@@ -640,3 +640,12 @@ typedef struct _NVRAM {
 #define SCSI_RESET_HOST_RESET 0x200
 #define SCSI_RESET_ACTION   0xff
 
+struct initio_cmd_priv {
+	dma_addr_t sense_dma_addr;
+	dma_addr_t sglist_dma_addr;
+};
+
+static inline struct initio_cmd_priv *initio_priv(struct scsi_cmnd *cmd)
+{
+	return scsi_cmd_priv(cmd);
+}