cvs commit: src/sys/dev/aic7xxx aic7xxx.c aic7xxx.h aic7xxx.reg aic7xxx.seq aic7xxx_inline.h

[Justin T. Gibbs]

gibbs       2003/05/26 14:24:01 PDT

  FreeBSD src repository

  Modified files:
    sys/dev/aic7xxx      aic7xxx.c aic7xxx.h aic7xxx.reg 
                         aic7xxx.seq aic7xxx_inline.h 
  Log:
  Correct/Simplify ignore wide residue message handling
  
  aic7xxx.c:
          In ahc_handle_ign_wide_residue():
          o Use SCB_XFERLEN_ODD SCB field to determine transfer
            "oddness" rather than the DATA_COUNT_ODD logic.
            SCB_XFERLEN_ODD is toggled on every ignore wide
            residue message so that multiple ignore wide residue
            messages for the same transaction are properly supported.
          o If the sg list has been exausted, the sequencer
            doesn't bother to update the residual data count
            since it is known to be zero.  Perform the zeroing
            manually before calculating the remaining data count.
          o Ensure that SG_LIST_NULL is cleared in the
            residual sg pointer for "mid-transfer" ignore
            wide residue cases.
          o Use multibyte in/out macros instead of shifting/masking
            by hand.
  
  aic7xxx.h:
          Modify the SCB_GET_LUN() macro to mask the lun hardware
          SCB field with LID.  This leaves two bits in the LUN
          field that can be used for other purposes.
  
  aic7xxx.reg:
          Change LID to be 0x3F.  This is the maximum supported
          lun size for non-packetized SCSI.  Map the top bit
          of the lun to SCB_XFERLEN_ODD.  The host must set
          this bit whenever a transfer is an odd length.
  
          Remove the ODD_SEG bit field that was used to carry the odd
          transfer length information through the SG cache.  This
          is obviated by SCB_XFERLEN_ODD field.
  
          Remove the DATA_COUNT_ODD scratch ram byte that was used
          dynamicaly compute data transfer oddness.  This is obviated
          by SCB_XFERLEN_ODD field.
  
  aic7xxx.seq:
          Be more careful in our handling of the SCB_LUN field.  It
          must be masked with LID if only lun information is desired.
  
          Remove all updates to the DATA_COUNT_ODD scratch ram field.
          Remove all uses of ODD_SEG.  These two save quite a few
          sequencer instructions.
  
          Use SCB_XFERLEN_ODD to validate the end of transfer
          ignore wide residue message case.
  
  aic7xxx_inline.h:
          In ahc_queue_scb(), setup the SCB_XFERLEN_ODD field.
  
  Approved by: RE
  
  Revision  Changes    Path
  1.91      +28 -28    src/sys/dev/aic7xxx/aic7xxx.c
  1.47      +2 -2      src/sys/dev/aic7xxx/aic7xxx.h
  1.45      +3 -12     src/sys/dev/aic7xxx/aic7xxx.reg
  1.124     +11 -23    src/sys/dev/aic7xxx/aic7xxx.seq
  1.22      +8 -1      src/sys/dev/aic7xxx/aic7xxx_inline.h