[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>

1 files changed, 16 insertions, 15 deletions

diff --git a/drivers/scsi/ipr.h b/drivers/scsi/ipr.h
index 4d068887608c..50e14f59f2fa 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;