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[SCSI] 3w-xxxx: 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: Adam Radford <linuxraid@amcc.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
FUJITA Tomonori 2007-05-14 20:20:27 +09:00 committed by James Bottomley
parent 0debe01d3e
commit 6edae708bf
1 changed files with 23 additions and 81 deletions
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104
drivers/scsi/3w-xxxx.c
View file

@ -1273,57 +1273,24 @@ static int tw_map_scsi_sg_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
int use_sg;
dprintk(KERN_WARNING "3w-xxxx: tw_map_scsi_sg_data()\n");
if (cmd->use_sg == 0)
return 0;
use_sg = pci_map_sg(pdev, cmd->request_buffer, cmd->use_sg, DMA_BIDIRECTIONAL);
if (use_sg == 0) {
use_sg = scsi_dma_map(cmd);
if (use_sg < 0) {
printk(KERN_WARNING "3w-xxxx: tw_map_scsi_sg_data(): pci_map_sg() failed.\n");
return 0;
}
cmd->SCp.phase = TW_PHASE_SGLIST;
cmd->SCp.have_data_in = use_sg;
return use_sg;
} /* End tw_map_scsi_sg_data() */
static u32 tw_map_scsi_single_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
{
dma_addr_t mapping;
dprintk(KERN_WARNING "3w-xxxx: tw_map_scsi_single_data()\n");
if (cmd->request_bufflen == 0)
return 0;
mapping = pci_map_page(pdev, virt_to_page(cmd->request_buffer), offset_in_page(cmd->request_buffer), cmd->request_bufflen, DMA_BIDIRECTIONAL);
if (mapping == 0) {
printk(KERN_WARNING "3w-xxxx: tw_map_scsi_single_data(): pci_map_page() failed.\n");
return 0;
}
cmd->SCp.phase = TW_PHASE_SINGLE;
cmd->SCp.have_data_in = mapping;
return mapping;
} /* End tw_map_scsi_single_data() */
static void tw_unmap_scsi_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
{
dprintk(KERN_WARNING "3w-xxxx: tw_unmap_scsi_data()\n");
switch(cmd->SCp.phase) {
case TW_PHASE_SINGLE:
pci_unmap_page(pdev, cmd->SCp.have_data_in, cmd->request_bufflen, DMA_BIDIRECTIONAL);
break;
case TW_PHASE_SGLIST:
pci_unmap_sg(pdev, cmd->request_buffer, cmd->use_sg, DMA_BIDIRECTIONAL);
break;
}
scsi_dma_unmap(cmd);
} /* End tw_unmap_scsi_data() */
/* This function will reset a device extension */
@ -1499,27 +1466,16 @@ static void tw_transfer_internal(TW_Device_Extension *tw_dev, int request_id,
void *buf;
unsigned int transfer_len;
unsigned long flags = 0;
struct scatterlist *sg = scsi_sglist(cmd);
if (cmd->use_sg) {
struct scatterlist *sg =
(struct scatterlist *)cmd->request_buffer;
local_irq_save(flags);
buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
transfer_len = min(sg->length, len);
} else {
buf = cmd->request_buffer;
transfer_len = min(cmd->request_bufflen, len);
}
local_irq_save(flags);
buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
transfer_len = min(sg->length, len);
memcpy(buf, data, transfer_len);
if (cmd->use_sg) {
struct scatterlist *sg;
sg = (struct scatterlist *)cmd->request_buffer;
kunmap_atomic(buf - sg->offset, KM_IRQ0);
local_irq_restore(flags);
}
kunmap_atomic(buf - sg->offset, KM_IRQ0);
local_irq_restore(flags);
}
/* This function is called by the isr to complete an inquiry command */
@ -1764,19 +1720,20 @@ static int tw_scsiop_read_write(TW_Device_Extension *tw_dev, int request_id)
{
TW_Command *command_packet;
unsigned long command_que_value;
u32 lba = 0x0, num_sectors = 0x0, buffaddr = 0x0;
u32 lba = 0x0, num_sectors = 0x0;
int i, use_sg;
struct scsi_cmnd *srb;
struct scatterlist *sglist;
struct scatterlist *sglist, *sg;
dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_read_write()\n");
if (tw_dev->srb[request_id]->request_buffer == NULL) {
srb = tw_dev->srb[request_id];
sglist = scsi_sglist(srb);
if (!sglist) {
printk(KERN_WARNING "3w-xxxx: tw_scsiop_read_write(): Request buffer NULL.\n");
return 1;
}
sglist = (struct scatterlist *)tw_dev->srb[request_id]->request_buffer;
srb = tw_dev->srb[request_id];
/* Initialize command packet */
command_packet = (TW_Command *)tw_dev->command_packet_virtual_address[request_id];
@ -1819,33 +1776,18 @@ static int tw_scsiop_read_write(TW_Device_Extension *tw_dev, int request_id)
command_packet->byte8.io.lba = lba;
command_packet->byte6.block_count = num_sectors;
/* Do this if there are no sg list entries */
if (tw_dev->srb[request_id]->use_sg == 0) {
dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_read_write(): SG = 0\n");
buffaddr = tw_map_scsi_single_data(tw_dev->tw_pci_dev, tw_dev->srb[request_id]);
if (buffaddr == 0)
return 1;
use_sg = tw_map_scsi_sg_data(tw_dev->tw_pci_dev, tw_dev->srb[request_id]);
if (!use_sg)
return 1;
command_packet->byte8.io.sgl[0].address = buffaddr;
command_packet->byte8.io.sgl[0].length = tw_dev->srb[request_id]->request_bufflen;
scsi_for_each_sg(tw_dev->srb[request_id], sg, use_sg, i) {
command_packet->byte8.io.sgl[i].address = sg_dma_address(sg);
command_packet->byte8.io.sgl[i].length = sg_dma_len(sg);
command_packet->size+=2;
}
/* Do this if we have multiple sg list entries */
if (tw_dev->srb[request_id]->use_sg > 0) {
use_sg = tw_map_scsi_sg_data(tw_dev->tw_pci_dev, tw_dev->srb[request_id]);
if (use_sg == 0)
return 1;
for (i=0;i<use_sg; i++) {
command_packet->byte8.io.sgl[i].address = sg_dma_address(&sglist[i]);
command_packet->byte8.io.sgl[i].length = sg_dma_len(&sglist[i]);
command_packet->size+=2;
}
}
/* Update SG statistics */
tw_dev->sgl_entries = tw_dev->srb[request_id]->use_sg;
tw_dev->sgl_entries = scsi_sg_count(tw_dev->srb[request_id]);
if (tw_dev->sgl_entries > tw_dev->max_sgl_entries)
tw_dev->max_sgl_entries = tw_dev->sgl_entries;