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authorBrian King <brking@linux.vnet.ibm.com>2007-03-29 12:43:50 -0500
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2007-04-01 11:19:12 -0500
commit51b1c7e19e18e84a44277951dd5c4c4617330baa (patch)
tree411022d7f1c4a886f331e2fa0f4f0f02ec13211d /drivers/scsi/ipr.h
parent0feeed823af05ca556087a89fdcf644f156f73b8 (diff)
downloadlinux-51b1c7e19e18e84a44277951dd5c4c4617330baa.tar.bz2
[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>
Diffstat (limited to 'drivers/scsi/ipr.h')
-rw-r--r--drivers/scsi/ipr.h31
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;