cvs commit: src/sys/dev/disk/aic7xxx aic7xxx.c

[Peter Avalos <pavalos@xxxxxxxxxxxxxxxxxxxxxxx>]

pavalos     2007/07/05 19:04:20 PDT

DragonFly src repository

  Modified files:
    sys/dev/disk/aic7xxx aic7xxx.c 
  Log:
  o When restarting the sequencer, clear any pending
    sequencer interrupt codes.  These codes are only
    relevant to the code that was last being executed
    and that context is cleared when we reset the
    program counter.  This addresses a race condition
    between a sequencer interrupt and any SCSI event
    that causes us to restart the sequencer.
  
  o When running the untagged-Q, we must start the
    timer for any transaction we queue.
  
  o Give the firmware half a millisecond between
    pauses to flush work out.  This should give us
    around half a second of total delay before flagging
    an issue with pausing and flushing controller work.
  
    Only attempt to clear critical sections if there
    are no pending interrupts in the pause and flush
    loop.  If the sequencer has issued an INTSTAT, we
    may not be able to step out of the critical section.
  
  o Cancel pending transactions on devices that
    respond with a selection timeout.  This decreases
    the duration of timeout recovery when a device
    disappears.
  
    Don't bother forcing renegotiation on a selection
    timeout now that we use the device reset handler
    to abort any pending commands on the target.
    The device reset handler already takes us down
    to async narrow and forces a renegotiation.
  
  o In the device reset handlers, only send a
    BDR sent async event if the status is not
    CAM_SEL_TIMEOUT.  This avoids sending this
    event in the selection timeout case.
  
  o Modify the Core timeout handler to verify that another
    command has the potential to timeout before passing off
    a command timeout as due to some other command.
  
  Obtained-from: FreeBSD
  
  Revision  Changes    Path
  1.17      +89 -27    src/sys/dev/disk/aic7xxx/aic7xxx.c


http://www.dragonflybsd.org/cvsweb/src/sys/dev/disk/aic7xxx/aic7xxx.c.diff?r1=1.16&r2=1.17&f=u