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Detect and report dataphase overruns. Put the adapter into 'Bit Bucket'

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mode when this occurs and allow the target to complete the transaction.
Force a retry on overruns since they are usually caused by termination or
cable problems.
This commit is contained in:
Justin T. Gibbs 1996-06-09 17:33:18 +00:00
parent e46f51fe95
commit 1ffa43c082
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=16260
3 changed files with 58 additions and 3 deletions
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27
sys/dev/aic7xxx/aic7xxx.seq
View File

@ -39,7 +39,7 @@
*
*-M************************************************************************/
VERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.40 1996/05/31 06:30:15 gibbs Exp $"
VERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.41 1996/06/08 06:54:06 gibbs Exp $"
#if defined(__NetBSD__)
#include "../../../../dev/ic/aic7xxxreg.h"
@ -340,12 +340,29 @@ data_phase_init:
or FLAGS, DPHASE /* We have seen a data phase */
data_phase_loop:
/* Guard against overruns */
test SG_COUNT, 0xff jnz data_phase_inbounds
/*
* Turn on 'Bit Bucket' mode, set the transfer count to
* 16meg and let the target run until it changes phase.
* When the transfer completes, notify the host that we
* had an overrun.
*/
or SXFRCTL1,BITBUCKET
mvi STCNT0,0xff
mvi STCNT1,0xff
mvi STCNT2,0xff
data_phase_inbounds:
/* If we are the last SG block, don't set wideodd. */
cmp SG_COUNT,0x01 jne data_phase_wideodd
and DMAPARAMS, 0xbf /* Turn off WIDEODD */
data_phase_wideodd:
mov DMAPARAMS call dma
/* Go tell the host about any overruns */
test SXFRCTL1,BITBUCKET jnz data_phase_overrun
/* Exit if we had an underrun */
test SSTAT0,SDONE jz data_phase_finish /* underrun STCNT != 0 */
@ -447,6 +464,14 @@ data_phase_finish:
mov SCB_RESID_SGCNT, SG_COUNT
jmp ITloop
data_phase_overrun:
/*
* Turn off BITBUCKET mode and notify the host
*/
and SXFRCTL1,0x7f /* ~BITBUCKET */
mvi INTSTAT,DATA_OVERRUN
jmp ITloop
/*
* Command phase. Set up the DMA registers and let 'er rip.
*/

7
sys/dev/aic7xxx/aic7xxx_reg.h
View File

@ -28,7 +28,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: aic7xxx_reg.h,v 1.10 1996/05/10 16:28:00 gibbs Exp $
* $Id: aic7xxx_reg.h,v 1.11 1996/05/21 18:32:23 gibbs Exp $
*/
/*
@ -434,6 +434,11 @@
* when we were expecting
* another msgin byte.
*/
#define DATA_OVERRUN 0xe1 /*
* Target attempted to write
* beyond the bounds of its
* command.
*/
#define BRKADRINT 0x08
#define SCSIINT 0x04
#define CMDCMPLT 0x02

27
sys/i386/scsi/aic7xxx.c
View File

@ -31,7 +31,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: aic7xxx.c,v 1.72 1996/05/31 06:32:09 gibbs Exp $
* $Id: aic7xxx.c,v 1.73 1996/06/08 06:55:01 gibbs Exp $
*/
/*
* TODO:
@ -1649,6 +1649,31 @@ ahc_intr(arg)
"unknown operation.");
break;
}
case DATA_OVERRUN:
{
/*
* When the sequencer detects an overrun, it
* sets STCNT to 0x00ffffff and allows the
* target to complete its transfer in
* BITBUCKET mode.
*/
u_char scbindex = AHC_INB(ahc, SCB_TAG);
u_int32_t overrun;
scb = ahc->scbarray[scbindex];
overrun = AHC_INB(ahc, STCNT0)
| (AHC_INB(ahc, STCNT1) << 8)
| (AHC_INB(ahc, STCNT2) << 16);
overrun = 0x00ffffff - overrun;
sc_print_addr(scb->xs->sc_link);
printf("data overrun of %d bytes detected."
" Forcing a retry.\n", overrun);
/*
* Set this and it will take affect when the
* target does a command complete.
*/
scb->xs->error = XS_DRIVER_STUFFUP;
break;
}
#if NOT_YET
/* XXX Fill these in later */
case MESG_BUFFER_BUSY: