FreeBSD/Linux Kernel Cross Reference
sys/scsi/scsi.c

     /* 
      * Mach Operating System
      * Copyright (c) 1993-1989 Carnegie Mellon University
      * All Rights Reserved.
      * 
      * Permission to use, copy, modify and distribute this software and its
      * documentation is hereby granted, provided that both the copyright
      * notice and this permission notice appear in all copies of the
      * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    /*
     * HISTORY
     * $Log:        scsi.c,v $
     * Revision 2.21  93/08/03  12:34:16  mrt
     *      Moved zero_ior() here.
     *      [93/07/29  23:37:16  af]
     * 
     *      Make CDROMs readonly.
     *      [93/05/06  10:07:01  af]
     * 
     * Revision 2.20  93/05/15  19:43:07  mrt
     *      machparam.h -> machspl.h
     * 
     * Revision 2.19  93/05/10  21:22:49  rvb
     *      Make CDROMs readonly.
     *      [93/05/06  10:07:01  af]
     * 
     * Revision 2.18  93/03/09  10:57:52  danner
     *      By default, do not require any enquiry-time operations to
     *      be done on devices.  The only case so far was a tape drive
     *      from <unnamed> who required a receive_diagnostics() at powerup.
     *      [93/03/06            af]
     * 
     *      Changes to make SCSI_MEMORY (optical direct access media) work.
     *      [93/02/17            jeffreyh]
     * 
     *      In scsi_bus_was_reset().  Fixed second loop to touch all
     *      targets for which we have a descriptor.  The problem is
     *      with dynamic probe and spinup of disks, assuming the disk
     *      takes a loooong time we endup resetting the bus while
     *      the scsi_inquiry() routine is spinning on tgt->done.
     *      [93/02/06            af]
     * 
     * Revision 2.17  93/01/14  17:55:45  danner
     *      Use SCSI_{OPEN,CLOSE,OPTIMIZE}_NULL
     *      [93/01/14            danner]
     * 
     *      Added initializers for up to 5 scsi busses. Proper spl typing.
     *      [92/12/01            af]
     * 
     * Revision 2.16  92/08/03  17:54:24  jfriedl
     *      removed silly prototypes
     *      [92/08/02            jfriedl]
     * 
     * Revision 2.15  92/05/21  17:24:02  jfriedl
     *      Cleanup to quiet gcc warnings.
     *      [92/05/16            jfriedl]
     * 
     * Revision 2.14  92/05/05  10:47:14  danner
     *      Reduced reset delay; knows about not probing itself;
     *      do not clear synch params on reset.
     *      [92/05/04  17:17:45  af]
     * 
     * Revision 2.13  92/02/23  22:44:40  elf
     *      Changed the interface of a number of functions not to
     *      require the scsi_softc pointer any longer.  It was
     *      mostly unused, now it can be found via tgt->masterno.
     *      [92/02/22  19:30:58  af]
     * 
     * Revision 2.12  91/08/24  12:28:21  af
     *      Spls defs, corrected scsi_master_alloc() to allocate
     *      as expected, support for processor devices, 
     *      made it possible to avoid sync neg at all (for rb's sake),
     *      no start unit on processor devices, understand our
     *      own descriptor.
     *      [91/08/02  04:01:50  af]
     * 
     * Revision 2.11  91/07/09  23:22:46  danner
     *      Added gross luna88k ifdef to use <sd.h> instead of <scsi.h>. Will be
     *      fixed when I understand how to use the configuration tools.
     *      [91/07/09  11:08:15  danner]
     * 
     * Revision 2.10  91/06/25  20:56:48  rpd
     *      Tweaks to make gcc happy.
    * 
    * Revision 2.9  91/06/19  11:57:17  rvb
    *      mips->DECSTATION; vax->VAXSTATION
    *      [91/06/12  14:02:21  rvb]
    * 
    *      File moved here from mips/PMAX since it is now "MI" code, also
    *      used by Vax3100 and soon -- the omron luna88k.
    *      [91/06/04            rvb]
    * 
    *      Printing of 'unsupported..' in scsi_slave was screwed cuz
    *      ui->mi and ui->unit could be bogus at that point in time.
    *      [91/05/30            af]
    * 
    * Revision 2.8  91/05/14  17:28:00  mrt
    *      Correcting copyright
    * 
    * Revision 2.7  91/05/13  06:04:45  af
    *      Added flags to control use of disconnect-reconnect mode.
    *      Added device-specific close routine (for tapes).
    *      Wait for start_unit to complete properly and tell the user
    *      what we are waiting for.
    *      [91/05/12  16:21:16  af]
    * 
    * Revision 2.6.1.1  91/03/29  16:59:15  af
    *      Added flags to control use of disconnect-reconnect mode.
    *      Added device-specific close routine (for tapes).
    *      Wait for start_unit to complete properly and tell the user
    *      what we are waiting for.
    * 
    * Revision 2.6  91/02/05  17:44:35  mrt
    *      Added author notices
    *      [91/02/04  11:18:01  mrt]
    * 
    *      Changed to use new Mach copyright
    *      [91/02/02  12:16:40  mrt]
    * 
    * Revision 2.5  90/12/05  23:34:36  af
    *      Cleanups, still awaits SCSI-2 fixes.
    *      [90/12/03  23:38:14  af]
    * 
    * Revision 2.3.1.1  90/11/01  03:38:17  af
    *      Created.
    *      [90/09/03            af]
    */
   /*
    *      File: scsi.c
    *      Author: Alessandro Forin, Carnegie Mellon University
    *      Date:   9/90
    *
    *      Middle layer of the SCSI driver: chip independent functions
    *      This file contains Controller and Device-independent functions
    */
   
   #include <scsi.h>
   
   #if     NSCSI > 0
   #include <platforms.h>
   
   #include <machine/machspl.h>            /* spl definitions */
   
   #include <mach/std_types.h>
   #include <sys/types.h>
   #include <scsi/compat_30.h>
   
   #include <chips/busses.h>
   #include <scsi/scsi.h>
   #include <scsi/scsi2.h>
   #include <scsi/scsi_defs.h>
   #include <machine/machspl.h>
   
   
   
   #ifdef  VAXSTATION
   /* We run some of this code on the interrupt stack */
   #undef  spl0
   #define spl0()  spl1()
   #endif  /*VAXSTATION*/
   
   /*
    *      Overall driver state
    */
   
   target_info_t   scsi_target_data[NSCSI*8];      /* per target state */
   scsi_softc_t    scsi_softc_data[NSCSI];         /* per HBA state */
   scsi_softc_t    *scsi_softc[NSCSI];             /* quick access&checking */
   
   /*
    * If a specific target should NOT be asked to go synchronous
    * then its bit in this bitmap should be set. Each SCSI controller
    * (Host Bus Adapter) can hold at most 8 targets --> use one
    * byte per controller.  A bit set to one means NO synchronous.
    * Patch with adb if necessary.
    */
   unsigned char   scsi_no_synchronous_xfer[NSCSI];
   
   /*
    * For certain targets it is wise to use the long form of the
    * read/write commands even if their capacity would not necessitate
    * it.  Same as above for usage.
    */
   unsigned char   scsi_use_long_form[NSCSI];
   
   
   /*
    * Control over disconnect-reconnect mode.
    */
   unsigned char   scsi_might_disconnect[NSCSI] =  /* do it if deemed appropriate */
                   { 0xff, 0xff, 0xff, 0xff, 0xff};/* Fix by hand viz NSCSI */
   unsigned char   scsi_should_disconnect[NSCSI] = /* just do it */
                   { 0,};
   unsigned char   scsi_initiator_id[NSCSI] =      /* our id on the bus(ses) */
                   { 7, 7, 7, 7, 7};
   
   /*
    * Miscellaneus config
    */
   boolean_t       scsi_exabyte_filemarks = FALSE; /* use short filemarks */
   int             scsi_watchdog_period = 10;      /* but exabyte needs >=30 for bspace */
   int             scsi_delay_after_reset = 1000000;/* microseconds */
   boolean_t       scsi_no_automatic_bbr = FALSE;  /* revector bad blocks automatically */
   
   #ifdef  MACH_KERNEL
   #else
   /* This covers Exabyte's max record size */
   unsigned int    scsi_per_target_virtual = 256*1024;
   #endif  MACH_KERNEL
   
   
   /*
    * Device-specific operations are switched off this table
    */
   
   extern char
                   *scdisk_name(), *sctape_name(), *scprt_name(),
                   *sccpu_name(), *scworm_name(), *sccdrom_name(),
                   *scscn_name(), *scmem_name(), *scjb_name(), *sccomm_name();
   extern void
                   sctape_optimize();
   extern scsi_ret_t
                   scdisk_open(), sctape_open(), sctape_close(),
                   sccomm_open(), sccomm_close();
   extern int
                   scdisk_strategy(), sctape_strategy(), sccpu_strategy(),
                   sccomm_strategy();
   extern void
                   scdisk_start(), sctape_start(), sccpu_start(), sccomm_start();
   
   extern io_return_t
                   scdisk_set_status(), scdisk_get_status(),
                   sctape_set_status(), sctape_get_status(),
                   sccomm_set_status(), sccomm_get_status();
   
   scsi_devsw_t    scsi_devsw[] = {
   
   /* SCSI_DISK */         { scdisk_name, SCSI_OPTIMIZE_NULL,
                             scdisk_open, SCSI_CLOSE_NULL,
                             scdisk_strategy, scdisk_start,
                             scdisk_get_status, scdisk_set_status },
   
   /* SCSI_TAPE */         { sctape_name, sctape_optimize,
                             sctape_open, sctape_close,
                             sctape_strategy, sctape_start,
                             sctape_get_status, sctape_set_status },
   
   /* SCSI_PRINTER */      { scprt_name, SCSI_OPTIMIZE_NULL, /*XXX*/},
   
   /* SCSI_CPU */          { sccpu_name, SCSI_OPTIMIZE_NULL,
                             SCSI_OPEN_NULL, SCSI_CLOSE_NULL,
                             sccpu_strategy, sccpu_start,},
   
   /* SCSI_WORM */         { scworm_name, SCSI_OPTIMIZE_NULL,
                             scdisk_open, SCSI_CLOSE_NULL,
                             scdisk_strategy, scdisk_start,
                             scdisk_get_status, scdisk_set_status },
   
   /* SCSI_CDROM */        { sccdrom_name, SCSI_OPTIMIZE_NULL,
                             scdisk_open, SCSI_CLOSE_NULL,
                             scdisk_strategy, scdisk_start,
                             scdisk_get_status, scdisk_set_status },
   /* scsi2 */
   /* SCSI_SCANNER */      { scscn_name, SCSI_OPTIMIZE_NULL, /*XXX*/ },
   
   /* SCSI_MEMORY */       { scmem_name, SCSI_OPTIMIZE_NULL,
                             scdisk_open, SCSI_CLOSE_NULL,
                             scdisk_strategy, scdisk_start,
                             scdisk_get_status, scdisk_set_status },
   
   /* SCSI_J_BOX */        { scjb_name, SCSI_OPTIMIZE_NULL, /*XXX*/ },
   
   /* SCSI_COMM */         { sccomm_name, SCSI_OPTIMIZE_NULL,
   #if     (NCENDATA>0)
                             sccomm_open, sccomm_close,
                             sccomm_strategy, sccomm_start,
                             sccomm_get_status, sccomm_set_status
   #endif
                           },
                           0
   };
   
   /*
    * Allocation routines for state structures
    */
   scsi_softc_t *
   scsi_master_alloc(unit, hw)
           unsigned unit;
           char    *hw;
   {
           scsi_softc_t    *sc;
   
           if (unit < NSCSI) {
                   sc = &scsi_softc_data[unit];
                   scsi_softc[unit] = sc;
                   sc->masterno = unit;
                   sc->hw_state = hw;
                   return sc;
           }
           return 0;
   }
   
   target_info_t *
   scsi_slave_alloc(unit, slave, hw)
           unsigned unit, slave;
           char    *hw;
   {
           target_info_t   *tgt;
   
           tgt = &scsi_target_data[(unit<<3) + slave];
           tgt->hw_state = hw;
           tgt->dev_ops = 0;       /* later */
           tgt->target_id = slave;
           tgt->masterno = unit;
           tgt->block_size = 1;    /* default */
           tgt->flags = TGT_ALIVE;
           tgt->sync_period = 0;
           tgt->sync_offset = 0;
           simple_lock_init(&tgt->target_lock);
   
           scsi_softc[unit]->target[slave] = tgt;
           return tgt;
   }
   
   void
   zero_ior(
           io_req_t        ior )
   {
           ior->io_next = ior->io_prev = 0;
           ior->io_count = 0;
           ior->io_op = IO_INTERNAL;
           ior->io_error = 0;
   }
   
   /*
    * Slave routine:
    *      See if the slave description (controller, unit, ..)
    *      matches one of the slaves found during probe
    *
    * Implementation:
    *      Send out an INQUIRY command to see what sort of device
    *      the slave is.
    * Notes:
    *      At this time the driver is fully functional and works
    *      off interrupts.
    * TODO:
    *      The SCSI2 spec says what exactly must happen: see F.2.3
    */
   int scsi_slave( ui, reg)
           struct bus_device       *ui;
           unsigned                reg;
   {
           scsi_softc_t            *sc = scsi_softc[(unsigned char)ui->ctlr];
           target_info_t           *tgt = sc->target[(unsigned char)ui->slave];
           scsi2_inquiry_data_t    *inq;
           int                     scsi_std;
           int                     ptype, s;
   
           if (!tgt || !(tgt->flags & TGT_ALIVE))
                   return 0;
   
           /* Might have scanned already */
           if (tgt->dev_ops)
                   goto out;
   
   #ifdef  SCSI2
           This is what should happen:
           - for all LUNs 
                   INQUIRY
                   scsi_verify_state (see)
                   scsi_initialize (see)
   #endif  SCSI2
   
           tgt->unit_no = ui->slave;       /* incorrect, but needed early */
   
           s = spl0();     /* we need interrupts */
   
           if (BGET(scsi_no_synchronous_xfer,(unsigned char)sc->masterno,tgt->target_id))
                   tgt->flags |= TGT_DID_SYNCH;
   
           /*
            * Ok, it is time to see what type of device this is,
            * send an INQUIRY cmd and wait till done.
            * Possibly do the synch negotiation here.
            */
           scsi_inquiry(tgt, SCSI_INQ_STD_DATA);
   
           inq = (scsi2_inquiry_data_t*)tgt->cmd_ptr;
           ptype = inq->periph_type;
   
           switch (ptype) {
           case SCSI_CDROM :
                   tgt->flags |= TGT_READONLY;
                   /* fall through */
           case SCSI_DISK :
           case SCSI_TAPE :
           case SCSI_PRINTER :
           case SCSI_CPU :
           case SCSI_WORM :
           case SCSI_SCANNER :
           case SCSI_MEMORY :
           case SCSI_J_BOX :
           case SCSI_COMM :
   /*      case SCSI_PREPRESS1 : reserved, really
           case SCSI_PREPRESS2 :   */
                   tgt->dev_ops = &scsi_devsw[ptype];
                   break;
           default:
                   printf("scsi%d: %s %d (x%x). ", ui->ctlr,
                          "Unsupported device type at SCSI id", ui->slave,
                           inq->periph_type);
                   scsi_print_inquiry((scsi2_inquiry_data_t*)inq,
                           SCSI_INQ_STD_DATA, 0);
                   tgt->flags = 0;
                   splx(s);
                   return 0;
           }
   
           if (inq->rmb)
                   tgt->flags |= TGT_REMOVABLE_MEDIA;
   
           /*
            * Tell the user we know this target, then see if we
            * can be a bit smart about it.
            */
           scsi_print_inquiry((scsi2_inquiry_data_t*)inq,
                   SCSI_INQ_STD_DATA, tgt->tgt_name);
           if (scsi_debug)
                   scsi_print_inquiry((scsi2_inquiry_data_t*)inq,
                           SCSI_INQ_STD_DATA, 0);
   
           /*
            * The above says if it currently behaves as a scsi2,
            * however scsi1 might just be the default setting.
            * The spec say that even if in scsi1 mode the target
            * should answer to the full scsi2 inquiry spec.
            */
           scsi_std = (inq->ansi == 2 || inq->response_fmt == 2) ? 2 : 1;
   #if nosey
           if (scsi_std == 2) {
                   unsigned char   supp_pages[256], i;
                   scsi2_impl_opdef_page_t *impl;
   
                   scsi_inquiry(tgt, SCSI_INQ_SUPP_PAGES);
                   impl = (scsi2_impl_opdef_page_t *)inq;
                   npages = impl->page_len - 2;
                   bcopy(impl->supp_opdef, supp_pages, npages);
   
                   for (i = 0; i < npages; i++) {
                           scsi_inquiry(tgt, supp_pages[i]);
                           scsi_print_inquiry(inq, supp_pages[i], 0);
                   }
           }
   
           if (scsi_std == 2) {
                   scsi2_impl_opdef_page_t *impl;
                   int i;
   
                   scsi_inquiry(tgt, SCSI_INQ_IMPL_OPDEF);
                   impl = (scsi2_impl_opdef_page_t *)inq;
                   for (i = 0; i < impl->page_len - 2; i++)
                           if (impl->supp_opdef[i] == SCSI2_OPDEF) {
                                   scsi_change_definition(tgt, SCSI2_OPDEF);
                                   /* if success .. */
                                           tgt->flags |= TGT_SCSI_2_MODE;
                                   break;
                           }
           }
   #endif  nosey
   
           splx(s);
   out:
           return (strcmp(ui->name, (*tgt->dev_ops->driver_name)(TRUE)) == 0);
   }
   
   #ifdef  SCSI2
   scsi_verify_state(...)
   {
   verify_state: send test_unit_ready up to 3 times, each time it fails
   (with check condition) send a requeste_sense. It is ok to get UNIT ATTENTION 
   the first time only, NOT READY the second, only GOOD the last time.
   If you get BUSY or RESERVATION CONFLICT retry.
   }
   
   scsi_initialize(...)
   {
   
   initialize: send start_unit with immed=0 (->disconnect), if fails
   with check condition send requeste_sense and if "illegal request"
   proceed anyways. Retry on BUSY.
   Do a verify_state, then
   disks:
           - mode_sense (current) if ANSI2 or needed by vendor (!!!!)
             and if check-condition&illegal-request goto capacity
           - mode_sense (changeable)
           - if needed do a mode_select (yes, 512)
           - read_capacity
   tapes:
   
   }
   #endif  SCSI2
   
   /*
    * Attach routine:
    *      Fill in all the relevant per-slave data and make
    *      the slave operational.
    *
    * Implementation:
    *      Get target's status, start the unit and then
    *      switch off to device-specific functions to gather
    *      as much info as possible about the slave.
    */
   void scsi_attach(ui)
           register struct bus_device *ui;
   {
           scsi_softc_t            *sc = scsi_softc[ui->mi->unit];
           target_info_t           *tgt = sc->target[(unsigned char)ui->slave];
           int                     i;
           spl_t                   s;
   
           printf(" (%s %s) ", (*tgt->dev_ops->driver_name)(FALSE),tgt->tgt_name);
   
           if (tgt->flags & TGT_US) {
                   printf(" [this cpu]");
                   return;
           }
   
           s = spl0();
   
           /* sense return from inquiry */
           scsi_request_sense(tgt, 0, 0);
   
           /*
            * Do this twice, certain targets need it
            */
           if (tgt->dev_ops != &scsi_devsw[SCSI_CPU]) {
                   (void) scsi_start_unit(tgt, SCSI_CMD_SS_START, 0);
                   i = 0;
                   while (scsi_start_unit(tgt, SCSI_CMD_SS_START, 0) == SCSI_RET_RETRY) {
                           if (i++ == 5)
                                   printf(".. not yet online ..");
                           delay(1000000);
                           if (i == 60) {
                                   printf(" seems hopeless.");
                                   break;
                           }
                   }
           }
   
           /*
            * See if it is up and about
            */
           scsi_test_unit_ready(tgt, 0);
   
           if (tgt->dev_ops->optimize != SCSI_OPTIMIZE_NULL)
                   (*tgt->dev_ops->optimize)(tgt);
   
           tgt->flags |= TGT_FULLY_PROBED;
   
           splx(s);
   }
   
   /*
    * Probe routine:
    *      See if a device answers.  Used AFTER autoconf.
    *
    * Implementation:
    *      First ask the HBA to see if anyone is there at all, then
    *      call the scsi_slave and scsi_attach routines with a fake ui.
    */
   boolean_t
   scsi_probe( sc, tgt_ptr, target_id, ior)
           scsi_softc_t            *sc;
           target_info_t           **tgt_ptr;
           int                     target_id;
           io_req_t                ior;
   {
           struct bus_device       ui;
           target_info_t           *tgt;
   
           if (!sc->probe || target_id > 7 || target_id == sc->initiator_id)
                   return FALSE;   /* sanity */
   
           if (sc->target[target_id] == 0)
                   scsi_slave_alloc( sc->masterno, target_id, sc->hw_state);
           tgt = sc->target[target_id];
           tgt->flags = 0;/* we donno yet */
           tgt->dev_ops = 0;
   
           /* mildly enquire */
           if (!(sc->probe)(tgt, ior))
                   goto fail;
   
           /* There is something there, see what it is */
           bzero(&ui, sizeof(ui));
           ui.ctlr = sc->masterno;
           ui.unit =
           ui.slave = target_id;
           ui.name = "";
   
           /* this fails on the name for sure */
           (void) scsi_slave( &ui, 0 /* brrrr */);
           if ((tgt->flags & TGT_ALIVE) == 0)
                   goto fail;
   
           {
                   struct bus_ctlr mi;
   
                   mi.unit = sc->masterno;
                   ui.mi = &mi;
                   printf("%s at slave %d ",
                           (*tgt->dev_ops->driver_name)(TRUE), target_id);
                   scsi_attach(&ui);
           }
   
           *tgt_ptr = tgt;
           return TRUE;
   fail:
           tgt->flags = 0;
           return FALSE;
   }
   
   
   /*
    * Watchdog routine:
    *      Issue a SCSI bus reset if a target holds up the
    *      bus for too long.
    *
    * Implementation:
    *      Each HBA that wants to use this should have a
    *      watchdog_t structure at the head of its hardware
    *      descriptor.  This variable is set by this periodic
    *      routine and reset on bus activity. If it is not reset on
    *      time (say some ten seconds or so) we reset the
    *      SCSI bus.
    * NOTE:
    *      An HBA must be ready to accept bus reset interrupts
    *      properly in order to use this.
    */
   void scsi_watchdog(hw)
           watchdog_t      *hw;
   {
           spl_t           s = splbio();
   
           switch (hw->watchdog_state) {
           case SCSI_WD_EXPIRED:
   
                   /* double check first */
                   if (hw->nactive == 0) {
                           hw->watchdog_state = SCSI_WD_INACTIVE;
                           break;
                   }
                   if (scsi_debug)
                           printf("SCSI Watchdog expired\n");
                   hw->watchdog_state = SCSI_WD_INACTIVE;
                   (*hw->reset)(hw);
                   break;
   
           case SCSI_WD_ACTIVE:
   
                   hw->watchdog_state = SCSI_WD_EXPIRED;
                   break;
   
           case SCSI_WD_INACTIVE:
   
                   break;
           }
   
           /* do this here, fends against powered down devices */
           if (scsi_watchdog_period != 0)
               timeout((int(*)())scsi_watchdog, (char*)hw, scsi_watchdog_period * hz);
   
           splx(s);
   }
   
   
   /*
    * BusReset Notification:
    *      Called when the HBA sees a BusReset interrupt
    *
    * Implementation:
    *      Go through the list of targets, redo the synch
    *      negotiation, and restart whatever operation was
    *      in progress for that target.
    */
   void scsi_bus_was_reset(sc)
           scsi_softc_t    *sc;
   {
           register target_info_t  *tgt;
           int                     i;
           /*
            * Redo the synch negotiation
            */
           for (i = 0; i < 8; i++) {
                   io_req_t        ior;
                   spl_t           s;
   
                   if (i == sc->initiator_id)
                           continue;
                   tgt = sc->target[i];
                   if (!tgt || !(tgt->flags & TGT_ALIVE))
                           continue;
   
                   tgt->flags &= ~(TGT_DID_SYNCH|TGT_DISCONNECTED);
   #if 0
                   /* the standard does *not* imply this gets reset too */
                   tgt->sync_period = 0;
                   tgt->sync_offset = 0;
   #endif
   
                   /*
                    * retry the synch negotiation
                    */
                   ior = tgt->ior;
                   tgt->ior = 0;
                   printf(".. tgt %d ", tgt->target_id);
                   if (BGET(scsi_no_synchronous_xfer,(unsigned char)sc->masterno,tgt->target_id))
                           tgt->flags |= TGT_DID_SYNCH;
                   else {
                           s = spl0();
                           scsi_test_unit_ready(tgt, 0);
                           splx(s);
                   }
                   tgt->ior = ior;
           }
   
           /*
            * Notify each target of the accident
            */
           for (i = 0; i < 8; i++) {
                   if (i == sc->initiator_id)
                           continue;
                   tgt = sc->target[i];
                   if (!tgt)
                           continue;
                   tgt->done = SCSI_RET_ABORTED|SCSI_RET_RETRY;
                   if (tgt->ior)
                           (*tgt->dev_ops->restart)( tgt, TRUE);
           }
   
           printf("%s", " reset complete\n");
   }
   
   #endif  NSCSI > 0

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