[PATCH v4 09/50] scsi: NCR5380: Move the SCSI pointer to private command data

Bart Van Assche
2022-02-16T21:03:13Z

Move the SCSI pointer into the NCR5380 private command data instead of
using the SCSI pointer from struct scsi_cmnd. This patch prepares for
removal of the SCSI pointer from struct scsi_cmnd. The NCR5380 drivers
have been identified as follows:
$ git grep -l '#include.*NCR5380.h'
drivers/scsi/arm/cumana_1.c
drivers/scsi/arm/oak.c
drivers/scsi/atari_scsi.c
drivers/scsi/dmx3191d.c
drivers/scsi/g_NCR5380.c
drivers/scsi/mac_scsi.c
drivers/scsi/sun3_scsi.c

Cc: Finn Thain <fthain@telegraphics.com.au>
Cc: Ondrej Zary <linux@rainbow-software.org>
Cc: Michael Schmitz <schmitzmic@gmail.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/scsi/NCR5380.c | 89 ++++++++++++++++++++++++---------------
drivers/scsi/NCR5380.h | 1 +
drivers/scsi/atari_scsi.c | 7 ++-
drivers/scsi/g_NCR5380.c | 6 ++-
drivers/scsi/mac_scsi.c | 7 ++-
drivers/scsi/sun3_scsi.c | 4 +-
6 files changed, 72 insertions(+), 42 deletions(-)

diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
index 6fa5e363945a..974b15cf8415 100644
--- a/drivers/scsi/NCR5380.c
+++ b/drivers/scsi/NCR5380.c
@@ -145,40 +145,47 @@ static void bus_reset_cleanup(struct Scsi_Host *);

static inline void initialize_SCp(struct scsi_cmnd *cmd)
{
+ struct scsi_pointer *scsi_pointer =
+ &NCR5380_cmd_priv(cmd)->scsi_pointer;
+
/*
* Initialize the Scsi Pointer field so that all of the commands in the
* various queues are valid.
*/

if (scsi_bufflen(cmd)) {
- cmd->SCp.buffer = scsi_sglist(cmd);
- cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
- cmd->SCp.this_residual = cmd->SCp.buffer->length;
+ scsi_pointer->buffer = scsi_sglist(cmd);
+ scsi_pointer->ptr = sg_virt(scsi_pointer->buffer);
+ scsi_pointer->this_residual = scsi_pointer->buffer->length;
} else {
- cmd->SCp.buffer = NULL;
- cmd->SCp.ptr = NULL;
- cmd->SCp.this_residual = 0;
+ scsi_pointer->buffer = NULL;
+ scsi_pointer->ptr = NULL;
+ scsi_pointer->this_residual = 0;
}

- cmd->SCp.Status = 0;
- cmd->SCp.Message = 0;
+ scsi_pointer->Status = 0;
+ scsi_pointer->Message = 0;
}

static inline void advance_sg_buffer(struct scsi_cmnd *cmd)
{
- struct scatterlist *s = cmd->SCp.buffer;
-
- if (!cmd->SCp.this_residual && s && !sg_is_last(s)) {
- cmd->SCp.buffer = sg_next(s);
- cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
- cmd->SCp.this_residual = cmd->SCp.buffer->length;
+ struct scsi_pointer *scsi_pointer =
+ &NCR5380_cmd_priv(cmd)->scsi_pointer;
+ struct scatterlist *s = scsi_pointer->buffer;
+
+ if (!scsi_pointer->this_residual && s && !sg_is_last(s)) {
+ scsi_pointer->buffer = sg_next(s);
+ scsi_pointer->ptr = sg_virt(scsi_pointer->buffer);
+ scsi_pointer->this_residual = scsi_pointer->buffer->length;
}
}

static inline void set_resid_from_SCp(struct scsi_cmnd *cmd)
{
- int resid = cmd->SCp.this_residual;
- struct scatterlist *s = cmd->SCp.buffer;
+ struct scsi_pointer *scsi_pointer =
+ &NCR5380_cmd_priv(cmd)->scsi_pointer;
+ int resid = scsi_pointer->this_residual;
+ struct scatterlist *s = scsi_pointer->buffer;

if (s)
while (!sg_is_last(s)) {
@@ -757,6 +764,7 @@ static void NCR5380_main(struct work_struct *work)
static void NCR5380_dma_complete(struct Scsi_Host *instance)
{
struct NCR5380_hostdata *hostdata = shost_priv(instance);
+ struct scsi_pointer *scsi_pointer;
int transferred;
unsigned char **data;
int *count;
@@ -764,7 +772,10 @@ static void NCR5380_dma_complete(struct Scsi_Host *instance)
unsigned char p;

if (hostdata->read_overruns) {
- p = hostdata->connected->SCp.phase;
+ struct scsi_pointer *scsi_pointer =
+ &NCR5380_cmd_priv(hostdata->connected)->scsi_pointer;
+
+ p = scsi_pointer->phase;
if (p & SR_IO) {
udelay(10);
if ((NCR5380_read(BUS_AND_STATUS_REG) &
@@ -801,8 +812,9 @@ static void NCR5380_dma_complete(struct Scsi_Host *instance)
transferred = hostdata->dma_len - NCR5380_dma_residual(hostdata);
hostdata->dma_len = 0;

- data = (unsigned char **)&hostdata->connected->SCp.ptr;
- count = &hostdata->connected->SCp.this_residual;
+ scsi_pointer = &NCR5380_cmd_priv(hostdata->connected)->scsi_pointer;
+ data = (unsigned char **)&scsi_pointer->ptr;
+ count = &scsi_pointer->this_residual;
*data += transferred;
*count -= transferred;

@@ -1487,6 +1499,8 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance,
unsigned char **data)
{
struct NCR5380_hostdata *hostdata = shost_priv(instance);
+ struct scsi_pointer *scsi_pointer =
+ &NCR5380_cmd_priv(hostdata->connected)->scsi_pointer;
int c = *count;
unsigned char p = *phase;
unsigned char *d = *data;
@@ -1498,7 +1512,7 @@ static int NCR5380_transfer_dma(struct Scsi_Host *instance,
return -1;
}

- hostdata->connected->SCp.phase = p;
+ scsi_pointer->phase = p;

if (p & SR_IO) {
if (hostdata->read_overruns)
@@ -1691,6 +1705,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)

while ((cmd = hostdata->connected)) {
struct NCR5380_cmd *ncmd = NCR5380_cmd_priv(cmd);
+ struct scsi_pointer *scsi_pointer = &ncmd->scsi_pointer;

tmp = NCR5380_read(STATUS_REG);
/* We only have a valid SCSI phase when REQ is asserted */
@@ -1712,10 +1727,10 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
if (count > 0) {
if (cmd->sc_data_direction == DMA_TO_DEVICE)
sun3scsi_dma_send_setup(hostdata,
- cmd->SCp.ptr, count);
+ scsi_pointer->ptr, count);
else
sun3scsi_dma_recv_setup(hostdata,
- cmd->SCp.ptr, count);
+ scsi_pointer->ptr, count);
sun3_dma_setup_done = cmd;
}
#ifdef SUN3_SCSI_VME
@@ -1758,8 +1773,8 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
advance_sg_buffer(cmd);
dsprintk(NDEBUG_INFORMATION, instance,
"this residual %d, sg ents %d\n",
- cmd->SCp.this_residual,
- sg_nents(cmd->SCp.buffer));
+ scsi_pointer->this_residual,
+ sg_nents(scsi_pointer->buffer));

/*
* The preferred transfer method is going to be
@@ -1778,7 +1793,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
if (transfersize > 0) {
len = transfersize;
if (NCR5380_transfer_dma(instance, &phase,
- &len, (unsigned char **)&cmd->SCp.ptr)) {
+ &len, (unsigned char **)&scsi_pointer->ptr)) {
/*
* If the watchdog timer fires, all future
* accesses to this device will use the
@@ -1794,13 +1809,13 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
/* Transfer a small chunk so that the
* irq mode lock is not held too long.
*/
- transfersize = min(cmd->SCp.this_residual,
+ transfersize = min(scsi_pointer->this_residual,
NCR5380_PIO_CHUNK_SIZE);
len = transfersize;
NCR5380_transfer_pio(instance, &phase, &len,
- (unsigned char **)&cmd->SCp.ptr,
+ (unsigned char **)&scsi_pointer->ptr,
0);
- cmd->SCp.this_residual -= transfersize - len;
+ scsi_pointer->this_residual -= transfersize - len;
}
#ifdef CONFIG_SUN3
if (sun3_dma_setup_done == cmd)
@@ -1811,7 +1826,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
len = 1;
data = &tmp;
NCR5380_transfer_pio(instance, &phase, &len, &data, 0);
- cmd->SCp.Message = tmp;
+ scsi_pointer->Message = tmp;

switch (tmp) {
case ABORT:
@@ -1828,15 +1843,15 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
hostdata->connected = NULL;
hostdata->busy[scmd_id(cmd)] &= ~(1 << cmd->device->lun);

- set_status_byte(cmd, cmd->SCp.Status);
+ set_status_byte(cmd, scsi_pointer->Status);

set_resid_from_SCp(cmd);

if (cmd->cmnd[0] == REQUEST_SENSE)
complete_cmd(instance, cmd);
else {
- if (cmd->SCp.Status == SAM_STAT_CHECK_CONDITION ||
- cmd->SCp.Status == SAM_STAT_COMMAND_TERMINATED) {
+ if (scsi_pointer->Status == SAM_STAT_CHECK_CONDITION ||
+ scsi_pointer->Status == SAM_STAT_COMMAND_TERMINATED) {
dsprintk(NDEBUG_QUEUES, instance, "autosense: adding cmd %p to tail of autosense queue\n",
cmd);
list_add_tail(&ncmd->list,
@@ -2000,7 +2015,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
len = 1;
data = &tmp;
NCR5380_transfer_pio(instance, &phase, &len, &data, 0);
- cmd->SCp.Status = tmp;
+ scsi_pointer->Status = tmp;
break;
default:
shost_printk(KERN_ERR, instance, "unknown phase\n");
@@ -2151,6 +2166,8 @@ static void NCR5380_reselect(struct Scsi_Host *instance)

#ifdef CONFIG_SUN3
if (sun3_dma_setup_done != tmp) {
+ struct scsi_pointer *scsi_pointer =
+ &NCR5380_cmd_priv(tmp)->scsi_pointer;
int count;

advance_sg_buffer(tmp);
@@ -2160,10 +2177,12 @@ static void NCR5380_reselect(struct Scsi_Host *instance)
if (count > 0) {
if (tmp->sc_data_direction == DMA_TO_DEVICE)
sun3scsi_dma_send_setup(hostdata,
- tmp->SCp.ptr, count);
+ scsi_pointer->ptr,
+ count);
else
sun3scsi_dma_recv_setup(hostdata,
- tmp->SCp.ptr, count);
+ scsi_pointer->ptr,
+ count);
sun3_dma_setup_done = tmp;
}
}
diff --git a/drivers/scsi/NCR5380.h b/drivers/scsi/NCR5380.h
index 88a1bb41b72e..a4291e7c24dd 100644
--- a/drivers/scsi/NCR5380.h
+++ b/drivers/scsi/NCR5380.h
@@ -227,6 +227,7 @@ struct NCR5380_hostdata {
};

struct NCR5380_cmd {
+ struct scsi_pointer scsi_pointer;
struct list_head list;
};

diff --git a/drivers/scsi/atari_scsi.c b/drivers/scsi/atari_scsi.c
index e9d0d99abc86..17e6a6262abf 100644
--- a/drivers/scsi/atari_scsi.c
+++ b/drivers/scsi/atari_scsi.c
@@ -538,7 +538,9 @@ static int falcon_classify_cmd(struct scsi_cmnd *cmd)
static int atari_scsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
struct scsi_cmnd *cmd)
{
- int wanted_len = cmd->SCp.this_residual;
+ struct scsi_pointer *scsi_pointer =
+ &NCR5380_cmd_priv(cmd)->scsi_pointer;
+ int wanted_len = scsi_pointer->this_residual;
int possible_len, limit;

if (wanted_len < DMA_MIN_SIZE)
@@ -610,7 +612,8 @@ static int atari_scsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
}

/* Last step: apply the hard limit on DMA transfers */
- limit = (atari_dma_buffer && !STRAM_ADDR(virt_to_phys(cmd->SCp.ptr))) ?
+ limit = (atari_dma_buffer &&
+ !STRAM_ADDR(virt_to_phys(scsi_pointer->ptr))) ?
STRAM_BUFFER_SIZE : 255*512;
if (possible_len > limit)
possible_len = limit;
diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c
index 5923f86a384e..f887ed2e0a8e 100644
--- a/drivers/scsi/g_NCR5380.c
+++ b/drivers/scsi/g_NCR5380.c
@@ -663,7 +663,9 @@ static inline int generic_NCR5380_psend(struct NCR5380_hostdata *hostdata,
static int generic_NCR5380_dma_xfer_len(struct NCR5380_hostdata *hostdata,
struct scsi_cmnd *cmd)
{
- int transfersize = cmd->SCp.this_residual;
+ struct scsi_pointer *scsi_pointer =
+ &NCR5380_cmd_priv(cmd)->scsi_pointer;
+ int transfersize = scsi_pointer->this_residual;

if (hostdata->flags & FLAG_NO_PSEUDO_DMA)
return 0;
@@ -675,7 +677,7 @@ static int generic_NCR5380_dma_xfer_len(struct NCR5380_hostdata *hostdata,
/* Limit PDMA send to 512 B to avoid random corruption on DTC3181E */
if (hostdata->board == BOARD_DTC3181E &&
cmd->sc_data_direction == DMA_TO_DEVICE)
- transfersize = min(cmd->SCp.this_residual, 512);
+ transfersize = min(scsi_pointer->this_residual, 512);

return min(transfersize, DMA_MAX_SIZE);
}
diff --git a/drivers/scsi/mac_scsi.c b/drivers/scsi/mac_scsi.c
index 71d493a0bb43..d44ad35621fb 100644
--- a/drivers/scsi/mac_scsi.c
+++ b/drivers/scsi/mac_scsi.c
@@ -404,11 +404,14 @@ static inline int macscsi_pwrite(struct NCR5380_hostdata *hostdata,
static int macscsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
struct scsi_cmnd *cmd)
{
+ struct scsi_pointer *scsi_pointer =
+ &NCR5380_cmd_priv(cmd)->scsi_pointer;
+
if (hostdata->flags & FLAG_NO_PSEUDO_DMA ||
- cmd->SCp.this_residual < setup_use_pdma)
+ scsi_pointer->this_residual < setup_use_pdma)
return 0;

- return cmd->SCp.this_residual;
+ return scsi_pointer->this_residual;
}

static int macscsi_dma_residual(struct NCR5380_hostdata *hostdata)
diff --git a/drivers/scsi/sun3_scsi.c b/drivers/scsi/sun3_scsi.c
index 82a253270c3b..3a584a1b7944 100644
--- a/drivers/scsi/sun3_scsi.c
+++ b/drivers/scsi/sun3_scsi.c
@@ -334,7 +334,9 @@ static int sun3scsi_dma_residual(struct NCR5380_hostdata *hostdata)
static int sun3scsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
struct scsi_cmnd *cmd)
{
- int wanted_len = cmd->SCp.this_residual;
+ struct scsi_pointer *scsi_pointer =
+ &NCR5380_cmd_priv(cmd)->scsi_pointer;
+ int wanted_len = scsi_pointer->this_residual;

if (wanted_len < DMA_MIN_SIZE || blk_rq_is_passthrough(scsi_cmd_to_rq(cmd)))
return 0;