Date: Wed, 13 Aug 1997 10:02:49 -0700 (PDT) From: "Justin T. Gibbs" <gibbs@FreeBSD.ORG> To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG, cvs-sys@FreeBSD.ORG Subject: cvs commit: src/sys/dev/aic7xxx aic7xxx.reg aic7xxx.seq src/sys/i386/scsi aic7xxx.c aic7xxx.h Message-ID: <199708131702.KAA00482@freefall.freebsd.org>
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gibbs 1997/08/13 10:02:49 PDT
Modified files:
sys/dev/aic7xxx aic7xxx.reg aic7xxx.seq
sys/i386/scsi aic7xxx.c aic7xxx.h
Log:
Add a spin lock that prevents the sequencer from attempting to add an
entry to the QOUTFIFO when it is full. This should eliminate the
"Timed out while idle" problems that many have reported.
In truth, this is somewhat of a hack. Although are interrupt latency is
low enough that we should be able to always service the queue in time,
since each entry must be passed up to the higher SCSI layer for what can
be a large amount of processing (perhaps even resulting in a new command
being queued) with interrupts disabled, we need this mechanism to avoid
overflow. In the future, these additional tasks will be offloaded to a
software interrupt handler which should make this hack unnecessary.
Revision Changes Path
1.5 +16 -1 src/sys/dev/aic7xxx/aic7xxx.reg
1.75 +10 -1 src/sys/dev/aic7xxx/aic7xxx.seq
1.121 +29 -8 src/sys/i386/scsi/aic7xxx.c
1.42 +6 -1 src/sys/i386/scsi/aic7xxx.h
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