Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=51b1c7e19e18e84a44277951dd5c4c4617330baa
Commit: 51b1c7e19e18e84a44277951dd5c4c4617330baa
Parent: 0feeed823af05ca556087a89fdcf644f156f73b8
Author: Brian King <[EMAIL PROTECTED]>
AuthorDate: Thu Mar 29 12:43:50 2007 -0500
Committer: James Bottomley <[EMAIL PROTECTED]>
CommitDate: Sun Apr 1 11:19:12 2007 -0500
[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 <[EMAIL PROTECTED]>
Signed-off-by: James Bottomley <[EMAIL PROTECTED]>
---
drivers/scsi/ipr.c | 28 +++++++++++++++++++++++-----
drivers/scsi/ipr.h | 31 ++++++++++++++++---------------
2 files changed, 39 insertions(+), 20 deletions(-)
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 @@ 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;
}
/**
diff --git a/drivers/scsi/ipr.h b/drivers/scsi/ipr.h
index 4d06888..50e14f5 100644
--- a/drivers/scsi/ipr.h
+++ b/drivers/scsi/ipr.h
@@ -422,9 +422,25 @@ struct ipr_ioarcb_ata_regs {
u8 ctl;
}__attribute__ ((packed, aligned(4)));
+struct ipr_ioadl_desc {
+ __be32 flags_and_data_len;
+#define IPR_IOADL_FLAGS_MASK 0xff000000
+#define IPR_IOADL_GET_FLAGS(x) (be32_to_cpu(x) & IPR_IOADL_FLAGS_MASK)
+#define IPR_IOADL_DATA_LEN_MASK 0x00ffffff
+#define IPR_IOADL_GET_DATA_LEN(x) (be32_to_cpu(x) & IPR_IOADL_DATA_LEN_MASK)
+#define IPR_IOADL_FLAGS_READ 0x48000000
+#define IPR_IOADL_FLAGS_READ_LAST 0x49000000
+#define IPR_IOADL_FLAGS_WRITE 0x68000000
+#define IPR_IOADL_FLAGS_WRITE_LAST 0x69000000
+#define IPR_IOADL_FLAGS_LAST 0x01000000
+
+ __be32 address;
+}__attribute__((packed, aligned (8)));
+
struct ipr_ioarcb_add_data {
union {
struct ipr_ioarcb_ata_regs regs;
+ struct ipr_ioadl_desc ioadl[5];
__be32 add_cmd_parms[10];
}u;
}__attribute__ ((packed, aligned(4)));
@@ -456,21 +472,6 @@ struct ipr_ioarcb {
struct ipr_ioarcb_add_data add_data;
}__attribute__((packed, aligned (4)));
-struct ipr_ioadl_desc {
- __be32 flags_and_data_len;
-#define IPR_IOADL_FLAGS_MASK 0xff000000
-#define IPR_IOADL_GET_FLAGS(x) (be32_to_cpu(x) & IPR_IOADL_FLAGS_MASK)
-#define IPR_IOADL_DATA_LEN_MASK 0x00ffffff
-#define IPR_IOADL_GET_DATA_LEN(x) (be32_to_cpu(x) & IPR_IOADL_DATA_LEN_MASK)
-#define IPR_IOADL_FLAGS_READ 0x48000000
-#define IPR_IOADL_FLAGS_READ_LAST 0x49000000
-#define IPR_IOADL_FLAGS_WRITE 0x68000000
-#define IPR_IOADL_FLAGS_WRITE_LAST 0x69000000
-#define IPR_IOADL_FLAGS_LAST 0x01000000
-
- __be32 address;
-}__attribute__((packed, aligned (8)));
-
struct ipr_ioasa_vset {
__be32 failing_lba_hi;
__be32 failing_lba_lo;
-
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