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| author | Brian King <brking@linux.vnet.ibm.com> | 2007-03-29 12:43:50 -0500 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.il.steeleye.com> | 2007-04-01 11:19:12 -0500 |
| commit | 51b1c7e19e18e84a44277951dd5c4c4617330baa (patch) | |
| tree | 411022d7f1c4a886f331e2fa0f4f0f02ec13211d /drivers/scsi/ipr.h | |
| parent | 0feeed823af05ca556087a89fdcf644f156f73b8 (diff) | |
| download | linux-51b1c7e19e18e84a44277951dd5c4c4617330baa.tar.gz linux-51b1c7e19e18e84a44277951dd5c4c4617330baa.tar.bz2 linux-51b1c7e19e18e84a44277951dd5c4c4617330baa.zip | |
[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.h | 31 |
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; |