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[SCSI] megaraid_old: 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.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Sumant Patro <sumant.patro@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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FUJITA Tomonori authored and James Bottomley committed May 31, 2007
1 parent 2b14ec7 commit 3f6270e
Showing 1 changed file with 25 additions and 106 deletions.
131 changes: 25 additions & 106 deletions drivers/scsi/megaraid.c
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Original file line number Diff line number Diff line change
Expand Up @@ -523,10 +523,8 @@ mega_build_cmd(adapter_t *adapter, Scsi_Cmnd *cmd, int *busy)
/*
* filter the internal and ioctl commands
*/
if((cmd->cmnd[0] == MEGA_INTERNAL_CMD)) {
return cmd->request_buffer;
}

if((cmd->cmnd[0] == MEGA_INTERNAL_CMD))
return (scb_t *)cmd->host_scribble;

/*
* We know what channels our logical drives are on - mega_find_card()
Expand Down Expand Up @@ -657,22 +655,14 @@ mega_build_cmd(adapter_t *adapter, Scsi_Cmnd *cmd, int *busy)

case MODE_SENSE: {
char *buf;
struct scatterlist *sg;

if (cmd->use_sg) {
struct scatterlist *sg;
sg = scsi_sglist(cmd);
buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;

sg = (struct scatterlist *)cmd->request_buffer;
buf = kmap_atomic(sg->page, KM_IRQ0) +
sg->offset;
} else
buf = cmd->request_buffer;
memset(buf, 0, cmd->cmnd[4]);
if (cmd->use_sg) {
struct scatterlist *sg;
kunmap_atomic(buf - sg->offset, KM_IRQ0);

sg = (struct scatterlist *)cmd->request_buffer;
kunmap_atomic(buf - sg->offset, KM_IRQ0);
}
cmd->result = (DID_OK << 16);
cmd->scsi_done(cmd);
return NULL;
Expand Down Expand Up @@ -1551,23 +1541,15 @@ mega_cmd_done(adapter_t *adapter, u8 completed[], int nstatus, int status)
islogical = adapter->logdrv_chan[cmd->device->channel];
if( cmd->cmnd[0] == INQUIRY && !islogical ) {

if( cmd->use_sg ) {
sgl = (struct scatterlist *)
cmd->request_buffer;

if( sgl->page ) {
c = *(unsigned char *)
sgl = scsi_sglist(cmd);
if( sgl->page ) {
c = *(unsigned char *)
page_address((&sgl[0])->page) +
(&sgl[0])->offset;
}
else {
printk(KERN_WARNING
"megaraid: invalid sg.\n");
c = 0;
}
}
else {
c = *(u8 *)cmd->request_buffer;
} else {
printk(KERN_WARNING
"megaraid: invalid sg.\n");
c = 0;
}

if(IS_RAID_CH(adapter, cmd->device->channel) &&
Expand Down Expand Up @@ -1704,30 +1686,14 @@ mega_rundoneq (adapter_t *adapter)
static void
mega_free_scb(adapter_t *adapter, scb_t *scb)
{
unsigned long length;

switch( scb->dma_type ) {

case MEGA_DMA_TYPE_NONE:
break;

case MEGA_BULK_DATA:
if (scb->cmd->use_sg == 0)
length = scb->cmd->request_bufflen;
else {
struct scatterlist *sgl =
(struct scatterlist *)scb->cmd->request_buffer;
length = sgl->length;
}
pci_unmap_page(adapter->dev, scb->dma_h_bulkdata,
length, scb->dma_direction);
break;

case MEGA_SGLIST:
pci_unmap_sg(adapter->dev, scb->cmd->request_buffer,
scb->cmd->use_sg, scb->dma_direction);
scsi_dma_unmap(scb->cmd);
break;

default:
break;
}
Expand Down Expand Up @@ -1767,80 +1733,33 @@ __mega_busywait_mbox (adapter_t *adapter)
static int
mega_build_sglist(adapter_t *adapter, scb_t *scb, u32 *buf, u32 *len)
{
struct scatterlist *sgl;
struct page *page;
unsigned long offset;
unsigned int length;
struct scatterlist *sg;
Scsi_Cmnd *cmd;
int sgcnt;
int idx;

cmd = scb->cmd;

/* Scatter-gather not used */
if( cmd->use_sg == 0 || (cmd->use_sg == 1 &&
!adapter->has_64bit_addr)) {

if (cmd->use_sg == 0) {
page = virt_to_page(cmd->request_buffer);
offset = offset_in_page(cmd->request_buffer);
length = cmd->request_bufflen;
} else {
sgl = (struct scatterlist *)cmd->request_buffer;
page = sgl->page;
offset = sgl->offset;
length = sgl->length;
}

scb->dma_h_bulkdata = pci_map_page(adapter->dev,
page, offset,
length,
scb->dma_direction);
scb->dma_type = MEGA_BULK_DATA;

/*
* We need to handle special 64-bit commands that need a
* minimum of 1 SG
*/
if( adapter->has_64bit_addr ) {
scb->sgl64[0].address = scb->dma_h_bulkdata;
scb->sgl64[0].length = length;
*buf = (u32)scb->sgl_dma_addr;
*len = (u32)length;
return 1;
}
else {
*buf = (u32)scb->dma_h_bulkdata;
*len = (u32)length;
}
return 0;
}

sgl = (struct scatterlist *)cmd->request_buffer;

/*
* Copy Scatter-Gather list info into controller structure.
*
* The number of sg elements returned must not exceed our limit
*/
sgcnt = pci_map_sg(adapter->dev, sgl, cmd->use_sg,
scb->dma_direction);
sgcnt = scsi_dma_map(cmd);

scb->dma_type = MEGA_SGLIST;

BUG_ON(sgcnt > adapter->sglen);
BUG_ON(sgcnt > adapter->sglen || sgcnt < 0);

*len = 0;

for( idx = 0; idx < sgcnt; idx++, sgl++ ) {

if( adapter->has_64bit_addr ) {
scb->sgl64[idx].address = sg_dma_address(sgl);
*len += scb->sgl64[idx].length = sg_dma_len(sgl);
}
else {
scb->sgl[idx].address = sg_dma_address(sgl);
*len += scb->sgl[idx].length = sg_dma_len(sgl);
scsi_for_each_sg(cmd, sg, sgcnt, idx) {
if (adapter->has_64bit_addr) {
scb->sgl64[idx].address = sg_dma_address(sg);
*len += scb->sgl64[idx].length = sg_dma_len(sg);
} else {
scb->sgl[idx].address = sg_dma_address(sg);
*len += scb->sgl[idx].length = sg_dma_len(sg);
}
}

Expand Down Expand Up @@ -4494,7 +4413,7 @@ mega_internal_command(adapter_t *adapter, megacmd_t *mc, mega_passthru *pthru)
scmd->device = sdev;

scmd->device->host = adapter->host;
scmd->request_buffer = (void *)scb;
scmd->host_scribble = (void *)scb;
scmd->cmnd[0] = MEGA_INTERNAL_CMD;

scb->state |= SCB_ACTIVE;
Expand Down

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