[SCSI] ipr: Faster sg list fetch
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>
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index aa1fb72..5cf1002 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -480,12 +480,16 @@
{
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 @@
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 @@
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_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 @@
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;
}
/**