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Disable disconnect after drive timeouts, since these

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may be the result of reselect following too fast for
the driver to notice. Not the final solution, but the
problem has been seen only with very few devices.

Reviewed by:	se
Submitted by:	wolf (Wolfgang Stanglmeier)
This commit is contained in:
Stefan Eßer 1995-02-02 15:50:57 +00:00
parent b78f244004
commit ea6ecb4e52
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=6136
1 changed files with 20 additions and 9 deletions
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29
sys/pci/ncr.c
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@ -1,6 +1,6 @@
/**************************************************************************
**
** $Id: ncr.c,v 1.15 1995/02/02 12:36:16 davidg Exp $
** $Id: ncr.c,v 1.16 1995/02/02 13:12:15 davidg Exp $
**
** Device driver for the NCR 53C810 PCI-SCSI-Controller.
**
@ -44,7 +44,7 @@
***************************************************************************
*/
#define NCR_PATCHLEVEL "pl4 95/01/27"
#define NCR_PATCHLEVEL "pl6 95/02/02"
#define NCR_VERSION (2)
#define MAX_UNITS (16)
@ -1073,6 +1073,11 @@ struct ncb {
*/
u_char maxwide;
/*
** option for M_IDENTIFY message: enables disconnecting
*/
u_char disc;
/*
** lockout of execption handler call while starting command.
*/
@ -1226,7 +1231,7 @@ static void ncr_attach (pcici_t tag, int unit);
static char ident[] =
"\n$Id: ncr.c,v 1.15 1995/02/02 12:36:16 davidg Exp $\n";
"\n$Id: ncr.c,v 1.16 1995/02/02 13:12:15 davidg Exp $\n";
u_long ncr_version = NCR_VERSION
+ (u_long) sizeof (struct ncb)
@ -3352,8 +3357,10 @@ static void ncr_attach (pcici_t config_id, int unit)
/*
** process the reset exception,
** if interrupts are not enabled yet.
** than enable disconnects.
*/
ncr_exception (np);
np->disc = 1;
#ifdef ANCIENT
printf ("%s: waiting for scsi devices to settle\n",
@ -3699,21 +3706,19 @@ static INT32 ncr_start (struct scsi_xfer * xp)
**----------------------------------------------------
*/
idmsg = M_IDENTIFY | xp->LUN;
#ifndef NCR_NO_DISCONNECT
idmsg = (cp==&np->ccb ? M_IDENTIFY : 0xc0) | xp->LUN;
#else
/*---------------------------------------------------------------------
** Some users have problems with this driver.
** I assume that the current problems relate to a conflict between
** a disconnect and an immediately following reconnect operation.
** With this option you can prevent the driver from using disconnects.
** If this removes the problems, I would know where to search further..
** Of course this is no solution.
** With this option one can prevent the driver from using disconnects.
** Without disconnects the performance will be severely degraded.
** But it may help to trace down the core problem.
**---------------------------------------------------------------------
*/
idmsg = M_IDENTIFY | xp->LUN;
if ((cp!=&np->ccb) && (np->disc))
idmsg |= 0x40;
#endif
cp -> scsi_smsg [0] = idmsg;
@ -4381,6 +4386,12 @@ void ncr_init (ncb_p np, char * msg, u_long code)
usrwide = (SCSI_NCR_MAX_WIDE);
if (usrwide > np->maxwide) usrwide=np->maxwide;
/*
** Disable disconnects.
*/
np->disc = 0;
/*
** Fill in target structure.
*/