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scsi-bsd-os.c

/*
 * This file has been modified for the cdrkit suite.
 *
 * The behaviour and appearence of the program code below can differ to a major
 * extent from the version distributed by the original author(s).
 *
 * For details, see Changelog file distributed with the cdrkit package. If you
 * received this file from another source then ask the distributing person for
 * a log of modifications.
 *
 */

/* @(#)scsi-bsd-os.c    1.28 04/01/15 Copyright 1997 J. Schilling */
/*
 *    Interface for the BSD/OS user-land raw SCSI implementation.
 *
 *    This is a hack, that tries to emulate the functionality
 *    of the usal driver.
 *
 *    Warning: you may change this source, but if you do that
 *    you need to change the _usal_version and _usal_auth* string below.
 *    You may not return "schily" for an SCG_AUTHOR request anymore.
 *    Choose your name instead of "schily" and make clear that the version
 *    string is related to a modified source.
 *
 *    Copyright (c) 1997 J. Schilling
 */
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; see the file COPYING.  If not, write to the Free Software
 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#undef      sense

#define     scsi_sense  bsdi_scsi_sense
#define     scsi_inquiry      bsdi_scsi_inquiry

/*
 * Must use -I/sys...
 * The next two files are in /sys/dev/scsi
 */
#include <dev/scsi/scsi.h>
#include <dev/scsi/scsi_ioctl.h>

/*
 *    Warning: you may change this source, but if you do that
 *    you need to change the _usal_version and _usal_auth* string below.
 *    You may not return "schily" for an SCG_AUTHOR request anymore.
 *    Choose your name instead of "schily" and make clear that the version
 *    string is related to a modified source.
 */
static      char  _usal_trans_version[] = "scsi-bsd-os.c-1.28";   /* The version for this transport*/

#define     MAX_SCG           16    /* Max # of SCSI controllers */
#define     MAX_TGT           16
#define     MAX_LUN           8

struct usal_local {
      short usalfiles[MAX_SCG][MAX_TGT][MAX_LUN];
};
#define     usallocal(p)      ((struct usal_local *)((p)->local))

#include <machine/param.h>

#define     MAX_DMA_BSDI      MAXPHYS           /* More makes problems */


static      BOOL  usal_setup(SCSI *usalp, int f, int busno, int tgt, int tlun);

/*
 * Return version information for the low level SCSI transport code.
 * This has been introduced to make it easier to trace down problems
 * in applications.
 */
static char *
usalo_version(SCSI *usalp, int what)
{
      if (usalp != (SCSI *)0) {
            switch (what) {

            case SCG_VERSION:
                  return (_usal_trans_version);
            /*
             * If you changed this source, you are not allowed to
             * return "schily" for the SCG_AUTHOR request.
             */
            case SCG_AUTHOR:
                  return (_usal_auth_cdrkit);
            case SCG_SCCS_ID:
                  return (__sccsid);
            }
      }
      return ((char *)0);
}

static int
usalo_help(SCSI *usalp, FILE *f)
{
      __usal_help(f, "SCSIRAWCDB", "Generic SCSI for devices known by BSDi",
            "", "devname:@,lun", "/dev/rsr0a:@,0", FALSE, TRUE);
      return (0);
}

static int
usalo_open(SCSI *usalp, char *device)
{
            int   busno = usal_scsibus(usalp);
            int   tgt   = usal_target(usalp);
            int   tlun  = usal_lun(usalp);
      register int      f;
      register int      b;
      register int      t;
      register int      l;
      register int      nopen = 0;
      char        devname[64];

      if (busno >= MAX_SCG || tgt >= MAX_TGT || tlun >= MAX_LUN) {
            errno = EINVAL;
            if (usalp->errstr)
                  snprintf(usalp->errstr, SCSI_ERRSTR_SIZE,
                        "Illegal value for busno, target or lun '%d,%d,%d'",
                        busno, tgt, tlun);
            return (-1);
      }

      if (usalp->local == NULL) {
            usalp->local = malloc(sizeof (struct usal_local));
            if (usalp->local == NULL)
                  return (0);

            for (b = 0; b < MAX_SCG; b++) {
                  for (t = 0; t < MAX_TGT; t++) {
                        for (l = 0; l < MAX_LUN; l++)
                              usallocal(usalp)->usalfiles[b][t][l] = (short)-1;
                  }
            }
      }

      if ((device != NULL && *device != '\0') || (busno == -2 && tgt == -2))
            goto openbydev;

      if (busno >= 0 && tgt >= 0 && tlun >= 0) {

            snprintf(devname, sizeof (devname),
                              "/dev/su%d-%d-%d", busno, tgt, tlun);
            f = open(devname, O_RDWR|O_NONBLOCK);
            if (f < 0) {
                  goto openbydev;
            }
            usallocal(usalp)->usalfiles[busno][tgt][tlun] = f;
            return (1);

      } else for (b = 0; b < MAX_SCG; b++) {
            for (t = 0; t < MAX_TGT; t++) {
                  for (l = 0; l < MAX_LUN; l++) {
                        snprintf(devname, sizeof (devname),
                                    "/dev/su%d-%d-%d", b, t, l);
                        f = open(devname, O_RDWR|O_NONBLOCK);
/*                      fprintf(stderr, "open (%s) = %d\n", devname, f);*/

                        if (f < 0) {
                              if (errno != ENOENT &&
                                  errno != ENXIO &&
                                  errno != ENODEV) {
                                    if (usalp->errstr)
                                          snprintf(usalp->errstr, SCSI_ERRSTR_SIZE,
                                                "Cannot open '%s'",
                                                devname);
                                    return (0);
                              }
                        } else {
                              if (usal_setup(usalp, f, b, t, l))
                                    nopen++;
                        }
                  }
            }
      }
      /*
       * Could not open /dev/su-* or got dev=devname:b,l,l / dev=devname:@,l
       * We do the apropriate tests and try our best.
       */
openbydev:
      if (nopen == 0) {
            if (device == NULL || device[0] == '\0')
                  return (0);
            f = open(device, O_RDWR|O_NONBLOCK);
            if (f < 0) {
                  if (usalp->errstr)
                        snprintf(usalp->errstr, SCSI_ERRSTR_SIZE,
                              "Cannot open '%s'",
                              device);
                  return (0);
            }
            if (tlun == -2) { /* If 'lun' is not known, we reject */
                  close(f);
                  errno = EINVAL;
                  return (0);
            }
            busno = 0;        /* use fake number, we cannot get it */
            tgt   = 0;        /* use fake number, we cannot get it */
            usal_settarget(usalp, busno, tgt, tlun);
            /* 'lun' has been specified on command line */
            if (usal_setup(usalp, f, busno, tgt, tlun))
                  nopen++;
      }
      return (nopen);
}

static int
usalo_close(SCSI *usalp)
{
      register int      f;
      register int      b;
      register int      t;
      register int      l;

      if (usalp->local == NULL)
            return (-1);

      for (b = 0; b < MAX_SCG; b++) {
            for (t = 0; t < MAX_TGT; t++) {
                  for (l = 0; l < MAX_LUN; l++) {
                        f = usallocal(usalp)->usalfiles[b][t][l];
                        if (f >= 0)
                              close(f);
                        usallocal(usalp)->usalfiles[b][t][l] = (short)-1;
                  }
            }
      }
      return (0);
}

static BOOL
usal_setup(SCSI *usalp, int f, int busno, int tgt, int tlun)
{
      int   Bus;
      int   Target;
      int   Lun;
      BOOL  onetarget = FALSE;

      if (usal_scsibus(usalp) >= 0 && usal_target(usalp) >= 0 && usal_lun(usalp) >= 0)
            onetarget = TRUE;

      /*
       * Unfortunately there is no way to get the right values from kernel.
       */
      Bus   = busno;
      Target      = tgt;
      Lun   = tlun;

      if (usalp->debug > 0) {
            fprintf((FILE *)usalp->errfile,
                  "Bus: %d Target: %d Lun: %d\n", Bus, Target, Lun);
      }

      if (Bus >= MAX_SCG || Target >= MAX_TGT || Lun >= MAX_LUN) {
            close(f);
            return (FALSE);
      }

      if (usallocal(usalp)->usalfiles[Bus][Target][Lun] == (short)-1)
            usallocal(usalp)->usalfiles[Bus][Target][Lun] = (short)f;

      if (onetarget) {
            if (Bus == busno && Target == tgt && Lun == tlun) {
                  return (TRUE);
            } else {
                  usallocal(usalp)->usalfiles[Bus][Target][Lun] = (short)-1;
                  close(f);
            }
      }
      return (FALSE);
}

static long
usalo_maxdma(SCSI *usalp, long amt)
{
      long maxdma = MAX_DMA_BSDI;

      return (maxdma);
}

static void *
usalo_getbuf(SCSI *usalp, long amt)
{
      if (usalp->debug > 0) {
            fprintf((FILE *)usalp->errfile,
                  "usalo_getbuf: %ld bytes\n", amt);
      }
      usalp->bufbase = malloc((size_t)(amt));
      return (usalp->bufbase);
}

static void
usalo_freebuf(SCSI *usalp)
{
      if (usalp->bufbase)
            free(usalp->bufbase);
      usalp->bufbase = NULL;
}

static BOOL
usalo_havebus(SCSI *usalp, int busno)
{
      register int      t;
      register int      l;

      if (busno < 0 || busno >= MAX_SCG)
            return (FALSE);

      if (usalp->local == NULL)
            return (FALSE);

      for (t = 0; t < MAX_TGT; t++) {
            for (l = 0; l < MAX_LUN; l++)
                  if (usallocal(usalp)->usalfiles[busno][t][l] >= 0)
                        return (TRUE);
      }
      return (FALSE);
}

static int
usalo_fileno(SCSI *usalp, int busno, int tgt, int tlun)
{
      if (busno < 0 || busno >= MAX_SCG ||
          tgt < 0 || tgt >= MAX_TGT ||
          tlun < 0 || tlun >= MAX_LUN)
            return (-1);

      if (usalp->local == NULL)
            return (-1);

      return ((int)usallocal(usalp)->usalfiles[busno][tgt][tlun]);
}

static int
usalo_initiator_id(SCSI *usalp)
{
      return (-1);
}

static int
usalo_isatapi(SCSI *usalp)
{
      return (FALSE);
}

static int
usalo_reset(SCSI *usalp, int what)
{
      /*
       * Cannot reset on BSD/OS
       */
      errno = EINVAL;
      return (-1);
}

static int
usalo_send(SCSI *usalp)
{
      struct usal_cmd   *sp = usalp->scmd;
      scsi_user_cdb_t   suc;
      int         ret = 0;

/*    fprintf((FILE *)usalp->errfile, "f: %d\n", f);*/
      if (usalp->fd < 0) {
            sp->error = SCG_FATAL;
            return (0);
      }

      /* Zero the structure... */
      fillbytes(&suc, sizeof (suc), '\0');

      /* Read or write? */
      if (sp->flags & SCG_RECV_DATA) {
            suc.suc_flags |= SUC_READ;
      } else if (sp->size > 0) {
            suc.suc_flags |= SUC_WRITE;
      }

      suc.suc_timeout = sp->timeout;

      suc.suc_cdblen = sp->cdb_len;
      movebytes(sp->cdb.cmd_cdb, suc.suc_cdb, suc.suc_cdblen);

      suc.suc_datalen = sp->size;
      suc.suc_data = sp->addr;

      if (ioctl(usalp->fd, SCSIRAWCDB, &suc) < 0) {
            ret  = -1;
            sp->ux_errno = geterrno();
            if (sp->ux_errno != ENOTTY)
                  ret = 0;
      } else {
            sp->ux_errno = 0;
            if (suc.suc_sus.sus_status != STS_GOOD)
                  sp->ux_errno = EIO;
      }
      fillbytes(&sp->scb, sizeof (sp->scb), '\0');
      fillbytes(&sp->u_sense.cmd_sense, sizeof (sp->u_sense.cmd_sense), '\0');
#if 0
      /*
       * Unfortunalety, BSD/OS has no idea of DMA residual count.
       */
      sp->resid = req.datalen - req.datalen_used;
      sp->sense_count = req.senselen_used;
#else
      sp->resid = 0;
      sp->sense_count = sizeof (suc.suc_sus.sus_sense);
#endif
      if (sp->sense_count > SCG_MAX_SENSE)
            sp->sense_count = SCG_MAX_SENSE;
      movebytes(suc.suc_sus.sus_sense, sp->u_sense.cmd_sense, sp->sense_count);
      sp->u_scb.cmd_scb[0] = suc.suc_sus.sus_status;

      switch (suc.suc_sus.sus_status) {

      case STS_GOOD:
                        sp->error = SCG_NO_ERROR;     break;
      case STS_CMD_TERMINATED:sp->error = SCG_TIMEOUT;      break;
      case STS_BUSY:          sp->error = SCG_RETRYABLE;    break;
      case STS_CHECKCOND:     sp->error = SCG_RETRYABLE;    break;
      case STS_QUEUE_FULL:    sp->error = SCG_RETRYABLE;    break;
      default:          sp->error = SCG_FATAL;        break;
      }

      return (ret);
}

#define     sense u_sense.Sense

#undef scsi_sense
#undef scsi_inquiry

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