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Date: Sun, 23 Apr 1995 15:07:58 -0700
From: "Justin T. Gibbs" <gibbs>
Message-Id: <199504232207.PAA10277@freefall.cdrom.com>
To: CVS-commiters, cvs-sys
Subject: cvs commit: src/sys/scsi cd.c pt.c scsi_base.c scsiconf.h sd.c st.c worm.c
Sender: cvs-sys-owner@freebsd.org
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gibbs       95/04/23 15:07:57

  Modified:    sys/i386/isa  bt742a.c
  Log:
  Don't arbitrarily set SCSI_NOSLEEP.  It is now handled correctly by the
  higher level scsi code.
  
  Spls should never be conditionalized, so don't do so here.
  
  Restructure the get_ccb routine so that we can't get into an infinite
  loop if the ccbs are exhausted and we are are called with SCSI_NOSLEEP set.
  
  Other driver maintainer's that based their ccb allocation routines on Julian's
  code should look at these changes and implement them for their driver.
  
  Submitted by: John Dyson

  Modified:    sys/i386/scsi  aic7xxx.c aic7xxx.h
  Log:
  Don't arbitrarily set SCSI_NOSLEEP.  It is now handled correctly by the
  higher level scsi code.
  
  Spls should never be conditionalized, so don't do so here.
  
  Restructure the get_scb routine so that we can't get into an infinite
  loop if the ccbs are exhausted and we are are called with SCSI_NOSLEEP set.
  
  Other driver maintainer's that based their scb allocation routines on Julian's
  code should look at these changes and implement them for their driver.
  
  The aic7xxx driver inspired these changes because early revs of the
  aic7770 chips have so few SCBs that you can actually run out.  If you
  have a rev C or aic7770 (as is reported by the driver probe) and had more
  than 2 drives, you could get into an infinite loop when using up all of
  the SCBs.  Since the driver will only allow two SCBs per device and I
  only had two devices, I never saw this problem on my Rev C card.
  
  Bzero only 19 bytes of the scb instead of 2k (ack!).  This was a hold
  over from when a struct SCB only contained the information downloaded
  to the board, but we now store kernel driver data in there as well.  This
  greatly lowers the overhead for small transactions (I get ~1MB/sec for
  dds with a 512 byte block size).
  
  Submitted by: John Dyson with the aic7xxx specific optimization by me

  Modified:    sys/scsi  cd.c pt.c scsi_base.c scsiconf.h sd.c st.c worm.c
  Log:
  Set SCSI_NOSLEEP only when we really need to.  This requires an additional
  flags parameter to all xxstart routines so that the correct information can
  be passed down into the device specific routines.  This is needed to ensure
  that ccb/scb allocation routines don't hang.
  
  Submitted by: John Dyson