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scsi-sgi.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-sgi.c 1.36 04/01/15 Copyright 1997 J. Schilling */
/*
 *    Interface for the SGI generic SCSI implementation.
 *
 *    First Hacky implementation
 *    (needed libds, did not support bus scanning and had no error checking)
 *    from "Frank van Beek" <frank@neogeo.nl>
 *
 *    Actual implementation supports all usal features.
 *
 *    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.
 */

#include <dslib.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-sgi.c-1.36";      /* The version for this transport*/

#ifdef      USE_DSLIB

struct dsreq * dsp = 0;
#define     MAX_SCG           1     /* Max # of SCSI controllers */

#else

#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))

#endif

#define     MAX_DMA_SGI (256*1024)  /* Check if this is not too big */


#ifndef     USE_DSLIB
static      int   usal_sendreq(SCSI *usalp, struct usal_cmd *sp, struct dsreq *dsp);
#endif


/*
 * 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, "DS", "Generic SCSI",
            "", "bus,target,lun", "1,2,0", TRUE, FALSE);
      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 ((device != NULL && *device != '\0') || (busno == -2 && tgt == -2)) {
            errno = EINVAL;
            if (usalp->errstr)
                  snprintf(usalp->errstr, SCSI_ERRSTR_SIZE,
                        "Open by 'devname' not supported on this OS");
            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 (busno >= 0 && tgt >= 0 && tlun >= 0) {

            snprintf(devname, sizeof (devname),
                        "/dev/scsi/sc%dd%dl%d", busno, tgt, tlun);
#ifdef      USE_DSLIB
            dsp = dsopen(devname, O_RDWR);
            if (dsp == 0)
                  return (-1);
#else
            f = open(devname, O_RDWR);
            if (f < 0) {
                  if (usalp->errstr)
                        snprintf(usalp->errstr, SCSI_ERRSTR_SIZE,
                              "Cannot open '%s'",
                              devname);
                  return (-1);
            }
            usallocal(usalp)->usalfiles[busno][tgt][tlun] = f;
#endif
            return (1);
      } else {
#ifdef      USE_DSLIB
            return (-1);
#else
            for (b = 0; b < MAX_SCG; b++) {
                  for (t = 0; t < MAX_TGT; t++) {
/*                      for (l = 0; l < MAX_LUN; l++) {*/
                        for (l = 0; l < 1; l++) {
                              snprintf(devname, sizeof (devname),
                                          "/dev/scsi/sc%dd%dl%d", b, t, l);
                              f = open(devname, O_RDWR);
                              if (f >= 0) {
                                    usallocal(usalp)->usalfiles[b][t][l] = (short)f;
                                    nopen++;
                              }
                        }
                  }
            }
#endif
      }
      return (nopen);
}

static int
usalo_close(SCSI *usalp)
{
#ifndef     USE_DSLIB
      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;
                  }
            }
      }
#else
      dsclose(dsp);
#endif
      return (0);
}

static long
usalo_maxdma(SCSI *usalp, long amt)
{
      return (MAX_DMA_SGI);
}

static void *
usalo_getbuf(SCSI *usalp, long amt)
{
      if (usalp->debug > 0) {
            fprintf((FILE *)usalp->errfile,
                        "usalo_getbuf: %ld bytes\n", amt);
      }
      usalp->bufbase = valloc((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)
{
#ifdef      USE_DSLIB
      if (dsp == NULL)
            return (-1);
      return (getfd(dsp));
#else
      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]);
#endif
}

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)
{
      /*
       * Do we have a SCSI reset on SGI?
       */
#ifdef      DS_RESET
      if (what == SCG_RESET_NOP)
            return (0);
      if (what != SCG_RESET_BUS) {
            errno = EINVAL;
            return (-1);
      }
      /*
       * XXX Does this reset TGT or BUS ???
       */
      return (ioctl(usalp->fd, DS_RESET, 0));
#else
      return (-1);
#endif
}

#ifndef     USE_DSLIB
static int
usal_sendreq(SCSI *usalp, struct usal_cmd *sp, struct dsreq *dsp)
{
      int   ret;
      int   retries = 4;
      Uchar status;

/*    if ((sp->flags & SCG_CMD_RETRY) == 0)*/
/*          retries = 0;*/

      while (--retries > 0) {
            ret = ioctl(usalp->fd, DS_ENTER, dsp);
            if (ret < 0)  {
                  RET(dsp) = DSRT_DEVSCSI;
                  return (-1);
            }
            /*
             * SGI implementattion botch!!!
             * If a target does not select the bus,
             * the return code is DSRT_TIMEOUT
             */
            if (RET(dsp) == DSRT_TIMEOUT) {
                  struct timeval to;

                  to.tv_sec = TIME(dsp)/1000;
                  to.tv_usec = TIME(dsp)%1000;
                  __usal_times(usalp);

                  if (sp->cdb.g0_cdb.cmd == SC_TEST_UNIT_READY &&
                      usalp->cmdstop->tv_sec < to.tv_sec ||
                      (usalp->cmdstop->tv_sec == to.tv_sec &&
                        usalp->cmdstop->tv_usec < to.tv_usec)) {

                        RET(dsp) = DSRT_NOSEL;
                        return (-1);
                  }
            }
            if (RET(dsp) == DSRT_NOSEL)
                  continue;         /* retry noselect 3X */

            status = STATUS(dsp);
            switch (status) {

            case 0x08:        /*  BUSY */
            case 0x18:        /*  RESERV CONFLICT */
                  if (retries > 0)
                        sleep(2);
                  continue;
            case 0x00:        /*  GOOD */
            case 0x02:        /*  CHECK CONDITION */
            case 0x10:        /*  INTERM/GOOD */
            default:
                  return (status);
            }
      }
      return (-1);      /* failed retry limit */
}
#endif

static int
usalo_send(SCSI *usalp)
{
      struct usal_cmd   *sp = usalp->scmd;
      int   ret;
      int   i;
      int   amt = sp->cdb_len;
      int flags;
#ifndef     USE_DSLIB
      struct dsreq      ds;
      struct dsreq      *dsp = &ds;

      dsp->ds_iovbuf = 0;
      dsp->ds_iovlen = 0;
#endif

      if (usalp->fd < 0) {
            sp->error = SCG_FATAL;
            return (0);
      }

      flags = DSRQ_SENSE;
      if (sp->flags & SCG_RECV_DATA)
            flags |= DSRQ_READ;
      else if (sp->size > 0)
            flags |= DSRQ_WRITE;

      dsp->ds_flags     = flags;
      dsp->ds_link      = 0;
      dsp->ds_synch     = 0;
      dsp->ds_ret       = 0;

      DATABUF(dsp)      = sp->addr;
      DATALEN(dsp)      = sp->size;
      CMDBUF(dsp) = (void *) &sp->cdb;
      CMDLEN(dsp) = sp->cdb_len;
      SENSEBUF(dsp)     = (caddr_t)sp->u_sense.cmd_sense;
      SENSELEN(dsp)     = sizeof (sp->u_sense.cmd_sense);
      TIME(dsp)   = (sp->timeout * 1000) + 100;

      errno       = 0;
      sp->ux_errno      = 0;
      sp->sense_count   = 0;

#ifdef      USE_DSLIB
      ret = doscsireq(usalp->fd, dsp);
#else
      ret = usal_sendreq(usalp, sp, dsp);
#endif

      if (RET(dsp) != DSRT_DEVSCSI)
            ret = 0;

      if (RET(dsp)) {
            if (RET(dsp) == DSRT_SHORT) {
                  sp->resid = DATALEN(dsp)- DATASENT(dsp);
            } else if (errno) {
                  sp->ux_errno = errno;
            } else {
                  sp->ux_errno = EIO;
            }

            sp->u_scb.cmd_scb[0] = STATUS(dsp);

            sp->sense_count = SENSESENT(dsp);
            if (sp->sense_count > SCG_MAX_SENSE)
                  sp->sense_count = SCG_MAX_SENSE;

      }
      switch (RET(dsp)) {

      default:
            sp->error = SCG_RETRYABLE;    break;

      case 0:                 /* OK                         */
      case DSRT_SHORT:  /* not implemented                   */
            sp->error = SCG_NO_ERROR;     break;

      case DSRT_UNIMPL: /* not implemented                  */
      case DSRT_REVCODE:      /* software obsolete must recompile       */
      case DSRT_NOSEL:
            sp->u_scb.cmd_scb[0] = 0;
            sp->error = SCG_FATAL;        break;

      case DSRT_TIMEOUT:
            sp->u_scb.cmd_scb[0] = 0;
            sp->error = SCG_TIMEOUT;      break;
      }
      return (ret);
}

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