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Remove hard coded assumption that SCSI busses have 7 targets.

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Change some leading spaces to tabs.

This change forces the controller drivers to allocate a scsibus_data struct
via a call to scsi_alloc_bus(), fill in the adapter_link field, and optionally
modify any other fields of the struct.  Scsi_alloc_bus() initializes all fields
to the default, so the changes in most drivers are very minimal.  For drivers
that support Wide controllers, the maxtarg field will have to be updated to
allow probing of all targets (for an example, look at the aic7xxx driver).

Scsi_attachdevs() now takes a scsibus_data* as its argument instead of an
sc_link*.  This allows us to expand the role of the scsibus_data struct for
other bus level configuration setings (max number of transactions, current
transaction opennings, etc for better tagged queuing support).

Reviewed by: Rodney Grimes <rgrimes>, Peter Dufault <dufault>, Julian Elischer <julian>
This commit is contained in:
Justin T. Gibbs 1995-08-23 23:03:17 +00:00
parent 6adca7ad76
commit ea46ac014f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=10204
1 changed files with 37 additions and 17 deletions
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54
sys/i386/scsi/aic7xxx.c
View file

@ -24,7 +24,7 @@
*
* commenced: Sun Sep 27 18:14:01 PDT 1992
*
* $Id: aic7xxx.c,v 1.35 1995/08/14 08:29:15 gibbs Exp $
* $Id: aic7xxx.c,v 1.36 1995/08/15 08:54:21 gibbs Exp $
*/
/*
* TODO:
@ -870,34 +870,54 @@ int
ahc_attach(unit)
int unit;
{
struct ahc_data *ahc = ahcdata[unit];
struct ahc_data *ahc = ahcdata[unit];
struct scsibus_data *scbus;
/*
* fill in the prototype scsi_link.
*/
ahc->sc_link.adapter_unit = unit;
ahc->sc_link.adapter_targ = ahc->our_id;
ahc->sc_link.adapter = &ahc_switch;
/*
* fill in the prototype scsi_link.
*/
ahc->sc_link.adapter_unit = unit;
ahc->sc_link.adapter_targ = ahc->our_id;
ahc->sc_link.adapter = &ahc_switch;
ahc->sc_link.opennings = 2;
ahc->sc_link.device = &ahc_dev;
ahc->sc_link.device = &ahc_dev;
ahc->sc_link.flags = DEBUGLEVEL;
ahc->sc_link.fordriver = 0;
/*
* ask the adapter what subunits are present
*/
/*
* Prepare the scsibus_data area for the upperlevel
* scsi code.
*/
scbus = scsi_alloc_bus();
if(!scbus)
return 0;
scbus->adapter_link = &ahc->sc_link;
if(ahc->type & AHC_WIDE)
scbus->maxtarg = 15;
/*
* ask the adapter what subunits are present
*/
printf("ahc%d: Probing channel A\n", unit);
scsi_attachdevs(&(ahc->sc_link));
scsi_attachdevs(scbus);
scbus = NULL; /* Upper-level SCSI code owns this now */
if(ahc->type & AHC_TWIN) {
/* Configure the second scsi bus */
ahc->sc_link_b = ahc->sc_link;
ahc->sc_link_b.adapter_targ = ahc->our_id_b;
ahc->sc_link_b.adapter_bus = 1;
ahc->sc_link_b.adapter_targ = ahc->our_id_b;
ahc->sc_link_b.adapter_bus = 1;
ahc->sc_link_b.fordriver = (void *)SELBUSB;
scbus = scsi_alloc_bus();
if(!scbus)
return 0;
scbus->adapter_link = &ahc->sc_link_b;
if(ahc->type & AHC_WIDE)
scbus->maxtarg = 15;
printf("ahc%d: Probing Channel B\n", unit);
scsi_attachdevs(&(ahc->sc_link_b));
scsi_attachdevs(scbus);
scbus = NULL; /* Upper-level SCSI code owns this now */
}
return 1;
return 1;
}
void