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[SCSI] ipr: Faster sg list fetch

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Improve overall command performance by embedding the scatterlist
in the command block used by the adapter. This decreases
the overall number of DMAs required for a single command.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Brian King
2007-03-29 12:43:50 -05:00
committed by James Bottomley
parent 0feeed823a
commit 51b1c7e19e
2 changed files with 39 additions and 20 deletions
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28
drivers/scsi/ipr.c
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@@ -480,12 +480,16 @@ static void ipr_reinit_ipr_cmnd(struct ipr_cmnd *ipr_cmd)
{
struct ipr_ioarcb *ioarcb = &ipr_cmd->ioarcb;
struct ipr_ioasa *ioasa = &ipr_cmd->ioasa;
dma_addr_t dma_addr = be32_to_cpu(ioarcb->ioarcb_host_pci_addr);
memset(&ioarcb->cmd_pkt, 0, sizeof(struct ipr_cmd_pkt));
ioarcb->write_data_transfer_length = 0;
ioarcb->read_data_transfer_length = 0;
ioarcb->write_ioadl_len = 0;
ioarcb->read_ioadl_len = 0;
ioarcb->write_ioadl_addr =
cpu_to_be32(dma_addr + offsetof(struct ipr_cmnd, ioadl));
ioarcb->read_ioadl_addr = ioarcb->write_ioadl_addr;
ioasa->ioasc = 0;
ioasa->residual_data_len = 0;
ioasa->u.gata.status = 0;
@@ -4230,6 +4234,14 @@ static int ipr_build_ioadl(struct ipr_ioa_cfg *ioa_cfg,
sglist = scsi_cmd->request_buffer;
if (ipr_cmd->dma_use_sg <= ARRAY_SIZE(ioarcb->add_data.u.ioadl)) {
ioadl = ioarcb->add_data.u.ioadl;
ioarcb->write_ioadl_addr =
cpu_to_be32(be32_to_cpu(ioarcb->ioarcb_host_pci_addr) +
offsetof(struct ipr_ioarcb, add_data));
ioarcb->read_ioadl_addr = ioarcb->write_ioadl_addr;
}
for (i = 0; i < ipr_cmd->dma_use_sg; i++) {
ioadl[i].flags_and_data_len =
cpu_to_be32(ioadl_flags | sg_dma_len(&sglist[i]));
@@ -4260,6 +4272,11 @@ static int ipr_build_ioadl(struct ipr_ioa_cfg *ioa_cfg,
scsi_cmd->sc_data_direction);
if (likely(!pci_dma_mapping_error(ipr_cmd->dma_handle))) {
ioadl = ioarcb->add_data.u.ioadl;
ioarcb->write_ioadl_addr =
cpu_to_be32(be32_to_cpu(ioarcb->ioarcb_host_pci_addr) +
offsetof(struct ipr_ioarcb, add_data));
ioarcb->read_ioadl_addr = ioarcb->write_ioadl_addr;
ipr_cmd->dma_use_sg = 1;
ioadl[0].flags_and_data_len =
cpu_to_be32(ioadl_flags | length | IPR_IOADL_FLAGS_LAST);
@@ -4346,11 +4363,9 @@ static void ipr_erp_done(struct ipr_cmnd *ipr_cmd)
**/
static void ipr_reinit_ipr_cmnd_for_erp(struct ipr_cmnd *ipr_cmd)
{
struct ipr_ioarcb *ioarcb;
struct ipr_ioasa *ioasa;
ioarcb = &ipr_cmd->ioarcb;
ioasa = &ipr_cmd->ioasa;
struct ipr_ioarcb *ioarcb = &ipr_cmd->ioarcb;
struct ipr_ioasa *ioasa = &ipr_cmd->ioasa;
dma_addr_t dma_addr = be32_to_cpu(ioarcb->ioarcb_host_pci_addr);
memset(&ioarcb->cmd_pkt, 0, sizeof(struct ipr_cmd_pkt));
ioarcb->write_data_transfer_length = 0;
@@ -4359,6 +4374,9 @@ static void ipr_reinit_ipr_cmnd_for_erp(struct ipr_cmnd *ipr_cmd)
ioarcb->read_ioadl_len = 0;
ioasa->ioasc = 0;
ioasa->residual_data_len = 0;
ioarcb->write_ioadl_addr =
cpu_to_be32(dma_addr + offsetof(struct ipr_cmnd, ioadl));
ioarcb->read_ioadl_addr = ioarcb->write_ioadl_addr;
}
/**