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

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- remove the unnecessary map_single path.

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

Jens Axboe <jens.axboe@oracle.com> did the for_each_sg cleanup.

TODO: use scsi_for_each_sg() in the breakup handling.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: "Salyzyn, Mark" <mark_salyzyn@adaptec.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
FUJITA Tomonori 2007-06-13 23:27:09 +09:00 committed by James Bottomley
parent bb350d1dec
commit 2f4cf91cc0
1 changed files with 91 additions and 149 deletions
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240
drivers/scsi/ips.c
View file

@ -1104,7 +1104,7 @@ static int ips_queue(struct scsi_cmnd *SC, void (*done) (struct scsi_cmnd *))
/* A Reset IOCTL is only sent by the boot CD in extreme cases. */
/* There can never be any system activity ( network or disk ), but check */
/* anyway just as a good practice. */
pt = (ips_passthru_t *) SC->request_buffer;
pt = (ips_passthru_t *) scsi_sglist(SC);
if ((pt->CoppCP.cmd.reset.op_code == IPS_CMD_RESET_CHANNEL) &&
(pt->CoppCP.cmd.reset.adapter_flag == 1)) {
if (ha->scb_activelist.count != 0) {
@ -1507,30 +1507,22 @@ static int ips_is_passthru(struct scsi_cmnd *SC)
if ((SC->cmnd[0] == IPS_IOCTL_COMMAND) &&
(SC->device->channel == 0) &&
(SC->device->id == IPS_ADAPTER_ID) &&
(SC->device->lun == 0) && SC->request_buffer) {
if ((!SC->use_sg) && SC->request_bufflen &&
(((char *) SC->request_buffer)[0] == 'C') &&
(((char *) SC->request_buffer)[1] == 'O') &&
(((char *) SC->request_buffer)[2] == 'P') &&
(((char *) SC->request_buffer)[3] == 'P'))
return 1;
else if (SC->use_sg) {
struct scatterlist *sg = SC->request_buffer;
char *buffer;
(SC->device->lun == 0) && scsi_sglist(SC)) {
struct scatterlist *sg = scsi_sglist(SC);
char *buffer;
/* kmap_atomic() ensures addressability of the user buffer.*/
/* local_irq_save() protects the KM_IRQ0 address slot. */
local_irq_save(flags);
buffer = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
if (buffer && buffer[0] == 'C' && buffer[1] == 'O' &&
buffer[2] == 'P' && buffer[3] == 'P') {
kunmap_atomic(buffer - sg->offset, KM_IRQ0);
local_irq_restore(flags);
return 1;
}
kunmap_atomic(buffer - sg->offset, KM_IRQ0);
local_irq_restore(flags);
}
/* kmap_atomic() ensures addressability of the user buffer.*/
/* local_irq_save() protects the KM_IRQ0 address slot. */
local_irq_save(flags);
buffer = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
if (buffer && buffer[0] == 'C' && buffer[1] == 'O' &&
buffer[2] == 'P' && buffer[3] == 'P') {
kunmap_atomic(buffer - sg->offset, KM_IRQ0);
local_irq_restore(flags);
return 1;
}
kunmap_atomic(buffer - sg->offset, KM_IRQ0);
local_irq_restore(flags);
}
return 0;
}
@ -1581,18 +1573,14 @@ ips_make_passthru(ips_ha_t *ha, struct scsi_cmnd *SC, ips_scb_t *scb, int intr)
{
ips_passthru_t *pt;
int length = 0;
int ret;
int i, ret;
struct scatterlist *sg = scsi_sglist(SC);
METHOD_TRACE("ips_make_passthru", 1);
if (!SC->use_sg) {
length = SC->request_bufflen;
} else {
struct scatterlist *sg = SC->request_buffer;
int i;
for (i = 0; i < SC->use_sg; i++)
length += sg[i].length;
}
scsi_for_each_sg(SC, sg, scsi_sg_count(SC), i)
length += sg[i].length;
if (length < sizeof (ips_passthru_t)) {
/* wrong size */
DEBUG_VAR(1, "(%s%d) Passthru structure wrong size",
@ -2016,7 +2004,7 @@ ips_cleanup_passthru(ips_ha_t * ha, ips_scb_t * scb)
METHOD_TRACE("ips_cleanup_passthru", 1);
if ((!scb) || (!scb->scsi_cmd) || (!scb->scsi_cmd->request_buffer)) {
if ((!scb) || (!scb->scsi_cmd) || (!scsi_sglist(scb->scsi_cmd))) {
DEBUG_VAR(1, "(%s%d) couldn't cleanup after passthru",
ips_name, ha->host_num);
@ -2766,41 +2754,26 @@ ips_next(ips_ha_t * ha, int intr)
/* copy in the CDB */
memcpy(scb->cdb, SC->cmnd, SC->cmd_len);
/* Now handle the data buffer */
if (SC->use_sg) {
scb->sg_count = scsi_dma_map(SC);
BUG_ON(scb->sg_count < 0);
if (scb->sg_count) {
struct scatterlist *sg;
int i;
sg = SC->request_buffer;
scb->sg_count = pci_map_sg(ha->pcidev, sg, SC->use_sg,
SC->sc_data_direction);
scb->flags |= IPS_SCB_MAP_SG;
for (i = 0; i < scb->sg_count; i++) {
scsi_for_each_sg(SC, sg, scb->sg_count, i) {
if (ips_fill_scb_sg_single
(ha, sg_dma_address(&sg[i]), scb, i,
sg_dma_len(&sg[i])) < 0)
(ha, sg_dma_address(sg), scb, i,
sg_dma_len(sg)) < 0)
break;
}
scb->dcdb.transfer_length = scb->data_len;
} else {
if (SC->request_bufflen) {
scb->data_busaddr =
pci_map_single(ha->pcidev,
SC->request_buffer,
SC->request_bufflen,
SC->sc_data_direction);
scb->flags |= IPS_SCB_MAP_SINGLE;
ips_fill_scb_sg_single(ha, scb->data_busaddr,
scb, 0,
SC->request_bufflen);
scb->dcdb.transfer_length = scb->data_len;
} else {
scb->data_busaddr = 0L;
scb->sg_len = 0;
scb->data_len = 0;
scb->dcdb.transfer_length = 0;
}
scb->data_busaddr = 0L;
scb->sg_len = 0;
scb->data_len = 0;
scb->dcdb.transfer_length = 0;
}
scb->dcdb.cmd_attribute =
@ -3277,52 +3250,32 @@ ips_done(ips_ha_t * ha, ips_scb_t * scb)
* the rest of the data and continue.
*/
if ((scb->breakup) || (scb->sg_break)) {
struct scatterlist *sg;
int sg_dma_index, ips_sg_index = 0;
/* we had a data breakup */
scb->data_len = 0;
if (scb->sg_count) {
/* S/G request */
struct scatterlist *sg;
int ips_sg_index = 0;
int sg_dma_index;
sg = scsi_sglist(scb->scsi_cmd);
sg = scb->scsi_cmd->request_buffer;
/* Spin forward to last dma chunk */
sg_dma_index = scb->breakup;
/* Spin forward to last dma chunk */
sg_dma_index = scb->breakup;
/* Take care of possible partial on last chunk */
ips_fill_scb_sg_single(ha,
sg_dma_address(&sg[sg_dma_index]),
scb, ips_sg_index++,
sg_dma_len(&sg[sg_dma_index]));
/* Take care of possible partial on last chunk */
ips_fill_scb_sg_single(ha,
sg_dma_address(&sg
[sg_dma_index]),
scb, ips_sg_index++,
sg_dma_len(&sg
[sg_dma_index]));
for (; sg_dma_index < scb->sg_count;
sg_dma_index++) {
if (ips_fill_scb_sg_single
(ha,
sg_dma_address(&sg[sg_dma_index]),
scb, ips_sg_index++,
sg_dma_len(&sg[sg_dma_index])) < 0)
break;
}
} else {
/* Non S/G Request */
(void) ips_fill_scb_sg_single(ha,
scb->
data_busaddr +
(scb->sg_break *
ha->max_xfer),
scb, 0,
scb->scsi_cmd->
request_bufflen -
(scb->sg_break *
ha->max_xfer));
}
for (; sg_dma_index < scsi_sg_count(scb->scsi_cmd);
sg_dma_index++) {
if (ips_fill_scb_sg_single
(ha,
sg_dma_address(&sg[sg_dma_index]),
scb, ips_sg_index++,
sg_dma_len(&sg[sg_dma_index])) < 0)
break;
}
scb->dcdb.transfer_length = scb->data_len;
scb->dcdb.cmd_attribute |=
@ -3553,32 +3506,27 @@ ips_send_wait(ips_ha_t * ha, ips_scb_t * scb, int timeout, int intr)
static void
ips_scmd_buf_write(struct scsi_cmnd *scmd, void *data, unsigned int count)
{
if (scmd->use_sg) {
int i;
unsigned int min_cnt, xfer_cnt;
char *cdata = (char *) data;
unsigned char *buffer;
unsigned long flags;
struct scatterlist *sg = scmd->request_buffer;
for (i = 0, xfer_cnt = 0;
(i < scmd->use_sg) && (xfer_cnt < count); i++) {
min_cnt = min(count - xfer_cnt, sg[i].length);
int i;
unsigned int min_cnt, xfer_cnt;
char *cdata = (char *) data;
unsigned char *buffer;
unsigned long flags;
struct scatterlist *sg = scsi_sglist(scmd);
/* kmap_atomic() ensures addressability of the data buffer.*/
/* local_irq_save() protects the KM_IRQ0 address slot. */
local_irq_save(flags);
buffer = kmap_atomic(sg[i].page, KM_IRQ0) + sg[i].offset;
memcpy(buffer, &cdata[xfer_cnt], min_cnt);
kunmap_atomic(buffer - sg[i].offset, KM_IRQ0);
local_irq_restore(flags);
for (i = 0, xfer_cnt = 0;
(i < scsi_sg_count(scmd)) && (xfer_cnt < count); i++) {
min_cnt = min(count - xfer_cnt, sg[i].length);
xfer_cnt += min_cnt;
}
/* kmap_atomic() ensures addressability of the data buffer.*/
/* local_irq_save() protects the KM_IRQ0 address slot. */
local_irq_save(flags);
buffer = kmap_atomic(sg[i].page, KM_IRQ0) + sg[i].offset;
memcpy(buffer, &cdata[xfer_cnt], min_cnt);
kunmap_atomic(buffer - sg[i].offset, KM_IRQ0);
local_irq_restore(flags);
} else {
unsigned int min_cnt = min(count, scmd->request_bufflen);
memcpy(scmd->request_buffer, data, min_cnt);
}
xfer_cnt += min_cnt;
}
}
/****************************************************************************/
@ -3591,32 +3539,27 @@ ips_scmd_buf_write(struct scsi_cmnd *scmd, void *data, unsigned int count)
static void
ips_scmd_buf_read(struct scsi_cmnd *scmd, void *data, unsigned int count)
{
if (scmd->use_sg) {
int i;
unsigned int min_cnt, xfer_cnt;
char *cdata = (char *) data;
unsigned char *buffer;
unsigned long flags;
struct scatterlist *sg = scmd->request_buffer;
for (i = 0, xfer_cnt = 0;
(i < scmd->use_sg) && (xfer_cnt < count); i++) {
min_cnt = min(count - xfer_cnt, sg[i].length);
int i;
unsigned int min_cnt, xfer_cnt;
char *cdata = (char *) data;
unsigned char *buffer;
unsigned long flags;
struct scatterlist *sg = scsi_sglist(scmd);
/* kmap_atomic() ensures addressability of the data buffer.*/
/* local_irq_save() protects the KM_IRQ0 address slot. */
local_irq_save(flags);
buffer = kmap_atomic(sg[i].page, KM_IRQ0) + sg[i].offset;
memcpy(&cdata[xfer_cnt], buffer, min_cnt);
kunmap_atomic(buffer - sg[i].offset, KM_IRQ0);
local_irq_restore(flags);
for (i = 0, xfer_cnt = 0;
(i < scsi_sg_count(scmd)) && (xfer_cnt < count); i++) {
min_cnt = min(count - xfer_cnt, sg[i].length);
xfer_cnt += min_cnt;
}
/* kmap_atomic() ensures addressability of the data buffer.*/
/* local_irq_save() protects the KM_IRQ0 address slot. */
local_irq_save(flags);
buffer = kmap_atomic(sg[i].page, KM_IRQ0) + sg[i].offset;
memcpy(&cdata[xfer_cnt], buffer, min_cnt);
kunmap_atomic(buffer - sg[i].offset, KM_IRQ0);
local_irq_restore(flags);
} else {
unsigned int min_cnt = min(count, scmd->request_bufflen);
memcpy(data, scmd->request_buffer, min_cnt);
}
xfer_cnt += min_cnt;
}
}
/****************************************************************************/
@ -4250,7 +4193,7 @@ ips_rdcap(ips_ha_t * ha, ips_scb_t * scb)
METHOD_TRACE("ips_rdcap", 1);
if (scb->scsi_cmd->request_bufflen < 8)
if (scsi_bufflen(scb->scsi_cmd) < 8)
return (0);
cap.lba =
@ -4635,8 +4578,7 @@ ips_freescb(ips_ha_t * ha, ips_scb_t * scb)
METHOD_TRACE("ips_freescb", 1);
if (scb->flags & IPS_SCB_MAP_SG)
pci_unmap_sg(ha->pcidev, scb->scsi_cmd->request_buffer,
scb->scsi_cmd->use_sg, IPS_DMA_DIR(scb));
scsi_dma_unmap(scb->scsi_cmd);
else if (scb->flags & IPS_SCB_MAP_SINGLE)
pci_unmap_single(ha->pcidev, scb->data_busaddr, scb->data_len,
IPS_DMA_DIR(scb));