[PATCH v3 30/48] scsi: mac53c94: Move the SCSI pointer to private command data

Bart Van Assche
2022-02-11T22:34:23Z

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.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/scsi/mac53c94.c | 24 +++++++++++++-----------
drivers/scsi/mac53c94.h | 11 +++++++++++
2 files changed, 24 insertions(+), 11 deletions(-)

diff --git a/drivers/scsi/mac53c94.c b/drivers/scsi/mac53c94.c
index afa08309de36..f3005b38931f 100644
--- a/drivers/scsi/mac53c94.c
+++ b/drivers/scsi/mac53c94.c
@@ -193,7 +193,8 @@ static void mac53c94_interrupt(int irq, void *dev_id)
struct fsc_state *state = (struct fsc_state *) dev_id;
struct mac53c94_regs __iomem *regs = state->regs;
struct dbdma_regs __iomem *dma = state->dma;
- struct scsi_cmnd *cmd = state->current_req;
+ struct scsi_cmnd *const cmd = state->current_req;
+ struct scsi_pointer *const scsi_pointer = mac53c94_scsi_pointer(cmd);
int nb, stat, seq, intr;
static int mac53c94_errors;

@@ -263,10 +264,10 @@ static void mac53c94_interrupt(int irq, void *dev_id)
/* set DMA controller going if any data to transfer */
if ((stat & (STAT_MSG|STAT_CD)) == 0
&& (scsi_sg_count(cmd) > 0 || scsi_bufflen(cmd))) {
- nb = cmd->SCp.this_residual;
+ nb = scsi_pointer->this_residual;
if (nb > 0xfff0)
nb = 0xfff0;
- cmd->SCp.this_residual -= nb;
+ scsi_pointer->this_residual -= nb;
writeb(nb, &regs->count_lo);
writeb(nb >> 8, &regs->count_mid);
writeb(CMD_DMA_MODE + CMD_NOP, &regs->command);
@@ -293,13 +294,13 @@ static void mac53c94_interrupt(int irq, void *dev_id)
cmd_done(state, DID_ERROR << 16);
return;
}
- if (cmd->SCp.this_residual != 0
+ if (scsi_pointer->this_residual != 0
&& (stat & (STAT_MSG|STAT_CD)) == 0) {
/* Set up the count regs to transfer more */
- nb = cmd->SCp.this_residual;
+ nb = scsi_pointer->this_residual;
if (nb > 0xfff0)
nb = 0xfff0;
- cmd->SCp.this_residual -= nb;
+ scsi_pointer->this_residual -= nb;
writeb(nb, &regs->count_lo);
writeb(nb >> 8, &regs->count_mid);
writeb(CMD_DMA_MODE + CMD_NOP, &regs->command);
@@ -321,8 +322,8 @@ static void mac53c94_interrupt(int irq, void *dev_id)
cmd_done(state, DID_ERROR << 16);
return;
}
- cmd->SCp.Status = readb(&regs->fifo);
- cmd->SCp.Message = readb(&regs->fifo);
+ scsi_pointer->Status = readb(&regs->fifo);
+ scsi_pointer->Message = readb(&regs->fifo);
writeb(CMD_ACCEPT_MSG, &regs->command);
state->phase = busfreeing;
break;
@@ -330,8 +331,8 @@ static void mac53c94_interrupt(int irq, void *dev_id)
if (intr != INTR_DISCONNECT) {
printk(KERN_DEBUG "got intr %x when expected disconnect\n", intr);
}
- cmd_done(state, (DID_OK << 16) + (cmd->SCp.Message << 8)
- + cmd->SCp.Status);
+ cmd_done(state, (DID_OK << 16) + (scsi_pointer->Message << 8)
+ + scsi_pointer->Status);
break;
default:
printk(KERN_DEBUG "don't know about phase %d\n", state->phase);
@@ -389,7 +390,7 @@ static void set_dma_cmds(struct fsc_state *state, struct scsi_cmnd *cmd)
dma_cmd += OUTPUT_LAST - OUTPUT_MORE;
dcmds[-1].command = cpu_to_le16(dma_cmd);
dcmds->command = cpu_to_le16(DBDMA_STOP);
- cmd->SCp.this_residual = total;
+ mac53c94_scsi_pointer(cmd)->this_residual = total;
}

static struct scsi_host_template mac53c94_template = {
@@ -401,6 +402,7 @@ static struct scsi_host_template mac53c94_template = {
.this_id = 7,
.sg_tablesize = SG_ALL,
.max_segment_size = 65535,
+ .cmd_size = sizeof(struct mac53c94_cmd_priv),
};

static int mac53c94_probe(struct macio_dev *mdev, const struct of_device_id *match)
diff --git a/drivers/scsi/mac53c94.h b/drivers/scsi/mac53c94.h
index 5df6e81f78a8..37d7d30f42ef 100644
--- a/drivers/scsi/mac53c94.h
+++ b/drivers/scsi/mac53c94.h
@@ -212,4 +212,15 @@ struct mac53c94_regs {
#define CF4_TEST 0x02
#define CF4_BBTE 0x01

+struct mac53c94_cmd_priv {
+ struct scsi_pointer scsi_pointer;
+};
+
+static inline struct scsi_pointer *mac53c94_scsi_pointer(struct scsi_cmnd *cmd)
+{
+ struct mac53c94_cmd_priv *mcmd = scsi_cmd_priv(cmd);
+
+ return &mcmd->scsi_pointer;
+}
+
#endif /* _MAC53C94_H */