[PATCH v4 21/50] scsi: fdomain: Move the SCSI pointer to private command data

Bart Van Assche
2022-02-16T21:03:37Z

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>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/scsi/fdomain.c | 64 ++++++++++++++++++++++++------------------
1 file changed, 36 insertions(+), 28 deletions(-)

diff --git a/drivers/scsi/fdomain.c b/drivers/scsi/fdomain.c
index 9159b4057c5d..444eac9b2466 100644
--- a/drivers/scsi/fdomain.c
+++ b/drivers/scsi/fdomain.c
@@ -115,6 +115,11 @@ struct fdomain {
struct work_struct work;
};

+static struct scsi_pointer *fdomain_scsi_pointer(struct scsi_cmnd *cmd)
+{
+ return scsi_cmd_priv(cmd);
+}
+
static inline void fdomain_make_bus_idle(struct fdomain *fd)
{
outb(0, fd->base + REG_BCTL);
@@ -263,20 +268,21 @@ static void fdomain_work(struct work_struct *work)
struct Scsi_Host *sh = container_of((void *)fd, struct Scsi_Host,
hostdata);
struct scsi_cmnd *cmd = fd->cur_cmd;
+ struct scsi_pointer *scsi_pointer = fdomain_scsi_pointer(cmd);
unsigned long flags;
int status;
int done = 0;

spin_lock_irqsave(sh->host_lock, flags);

- if (cmd->SCp.phase & in_arbitration) {
+ if (scsi_pointer->phase & in_arbitration) {
status = inb(fd->base + REG_ASTAT);
if (!(status & ASTAT_ARB)) {
set_host_byte(cmd, DID_BUS_BUSY);
fdomain_finish_cmd(fd);
goto out;
}
- cmd->SCp.phase = in_selection;
+ scsi_pointer->phase = in_selection;

outb(ICTL_SEL | FIFO_COUNT, fd->base + REG_ICTL);
outb(BCTL_BUSEN | BCTL_SEL, fd->base + REG_BCTL);
@@ -285,7 +291,7 @@ static void fdomain_work(struct work_struct *work)
/* Stop arbitration and enable parity */
outb(ACTL_IRQEN | PARITY_MASK, fd->base + REG_ACTL);
goto out;
- } else if (cmd->SCp.phase & in_selection) {
+ } else if (scsi_pointer->phase & in_selection) {
status = inb(fd->base + REG_BSTAT);
if (!(status & BSTAT_BSY)) {
/* Try again, for slow devices */
@@ -297,75 +303,75 @@ static void fdomain_work(struct work_struct *work)
/* Stop arbitration and enable parity */
outb(ACTL_IRQEN | PARITY_MASK, fd->base + REG_ACTL);
}
- cmd->SCp.phase = in_other;
+ scsi_pointer->phase = in_other;
outb(ICTL_FIFO | ICTL_REQ | FIFO_COUNT, fd->base + REG_ICTL);
outb(BCTL_BUSEN, fd->base + REG_BCTL);
goto out;
}

- /* cur_cmd->SCp.phase == in_other: this is the body of the routine */
+ /* fdomain_scsi_pointer(cur_cmd)->phase == in_other: this is the body of the routine */
status = inb(fd->base + REG_BSTAT);

if (status & BSTAT_REQ) {
switch (status & (BSTAT_MSG | BSTAT_CMD | BSTAT_IO)) {
case BSTAT_CMD: /* COMMAND OUT */
- outb(cmd->cmnd[cmd->SCp.sent_command++],
+ outb(cmd->cmnd[scsi_pointer->sent_command++],
fd->base + REG_SCSI_DATA);
break;
case 0: /* DATA OUT -- tmc18c50/tmc18c30 only */
- if (fd->chip != tmc1800 && !cmd->SCp.have_data_in) {
- cmd->SCp.have_data_in = -1;
+ if (fd->chip != tmc1800 && !scsi_pointer->have_data_in) {
+ scsi_pointer->have_data_in = -1;
outb(ACTL_IRQEN | ACTL_FIFOWR | ACTL_FIFOEN |
PARITY_MASK, fd->base + REG_ACTL);
}
break;
case BSTAT_IO: /* DATA IN -- tmc18c50/tmc18c30 only */
- if (fd->chip != tmc1800 && !cmd->SCp.have_data_in) {
- cmd->SCp.have_data_in = 1;
+ if (fd->chip != tmc1800 && !scsi_pointer->have_data_in) {
+ scsi_pointer->have_data_in = 1;
outb(ACTL_IRQEN | ACTL_FIFOEN | PARITY_MASK,
fd->base + REG_ACTL);
}
break;
case BSTAT_CMD | BSTAT_IO: /* STATUS IN */
- cmd->SCp.Status = inb(fd->base + REG_SCSI_DATA);
+ scsi_pointer->Status = inb(fd->base + REG_SCSI_DATA);
break;
case BSTAT_MSG | BSTAT_CMD: /* MESSAGE OUT */
outb(MESSAGE_REJECT, fd->base + REG_SCSI_DATA);
break;
case BSTAT_MSG | BSTAT_CMD | BSTAT_IO: /* MESSAGE IN */
- cmd->SCp.Message = inb(fd->base + REG_SCSI_DATA);
- if (cmd->SCp.Message == COMMAND_COMPLETE)
+ scsi_pointer->Message = inb(fd->base + REG_SCSI_DATA);
+ if (scsi_pointer->Message == COMMAND_COMPLETE)
++done;
break;
}
}

- if (fd->chip == tmc1800 && !cmd->SCp.have_data_in &&
- cmd->SCp.sent_command >= cmd->cmd_len) {
+ if (fd->chip == tmc1800 && !scsi_pointer->have_data_in &&
+ scsi_pointer->sent_command >= cmd->cmd_len) {
if (cmd->sc_data_direction == DMA_TO_DEVICE) {
- cmd->SCp.have_data_in = -1;
+ scsi_pointer->have_data_in = -1;
outb(ACTL_IRQEN | ACTL_FIFOWR | ACTL_FIFOEN |
PARITY_MASK, fd->base + REG_ACTL);
} else {
- cmd->SCp.have_data_in = 1;
+ scsi_pointer->have_data_in = 1;
outb(ACTL_IRQEN | ACTL_FIFOEN | PARITY_MASK,
fd->base + REG_ACTL);
}
}

- if (cmd->SCp.have_data_in == -1) /* DATA OUT */
+ if (scsi_pointer->have_data_in == -1) /* DATA OUT */
fdomain_write_data(cmd);

- if (cmd->SCp.have_data_in == 1) /* DATA IN */
+ if (scsi_pointer->have_data_in == 1) /* DATA IN */
fdomain_read_data(cmd);

if (done) {
- set_status_byte(cmd, cmd->SCp.Status);
+ set_status_byte(cmd, scsi_pointer->Status);
set_host_byte(cmd, DID_OK);
- scsi_msg_to_host_byte(cmd, cmd->SCp.Message);
+ scsi_msg_to_host_byte(cmd, scsi_pointer->Message);
fdomain_finish_cmd(fd);
} else {
- if (cmd->SCp.phase & disconnect) {
+ if (scsi_pointer->phase & disconnect) {
outb(ICTL_FIFO | ICTL_SEL | ICTL_REQ | FIFO_COUNT,
fd->base + REG_ICTL);
outb(0, fd->base + REG_BCTL);
@@ -398,14 +404,15 @@ static irqreturn_t fdomain_irq(int irq, void *dev_id)

static int fdomain_queue(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
{
+ struct scsi_pointer *scsi_pointer = fdomain_scsi_pointer(cmd);
struct fdomain *fd = shost_priv(cmd->device->host);
unsigned long flags;

- cmd->SCp.Status = 0;
- cmd->SCp.Message = 0;
- cmd->SCp.have_data_in = 0;
- cmd->SCp.sent_command = 0;
- cmd->SCp.phase = in_arbitration;
+ scsi_pointer->Status = 0;
+ scsi_pointer->Message = 0;
+ scsi_pointer->have_data_in = 0;
+ scsi_pointer->sent_command = 0;
+ scsi_pointer->phase = in_arbitration;
scsi_set_resid(cmd, scsi_bufflen(cmd));

spin_lock_irqsave(sh->host_lock, flags);
@@ -440,7 +447,7 @@ static int fdomain_abort(struct scsi_cmnd *cmd)
spin_lock_irqsave(sh->host_lock, flags);

fdomain_make_bus_idle(fd);
- fd->cur_cmd->SCp.phase |= aborted;
+ fdomain_scsi_pointer(fd->cur_cmd)->phase |= aborted;

/* Aborts are not done well. . . */
set_host_byte(fd->cur_cmd, DID_ABORT);
@@ -501,6 +508,7 @@ static struct scsi_host_template fdomain_template = {
.this_id = 7,
.sg_tablesize = 64,
.dma_boundary = PAGE_SIZE - 1,
+ .cmd_size = sizeof(struct scsi_pointer),
};

struct Scsi_Host *fdomain_create(int base, int irq, int this_id,