scsi-sgi.c
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上传日期:2007-01-06
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- /* @(#)scsi-sgi.c 1.19 99/09/17 Copyright 1997 J. Schilling */
- #ifndef lint
- static char __sccsid[] =
- "@(#)scsi-sgi.c 1.19 99/09/17 Copyright 1997 J. Schilling";
- #endif
- /*
- * 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 scg features.
- *
- * Warning: you may change this source, but if you do that
- * you need to change the _scg_version and _scg_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 as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * 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, 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- #include <dslib.h>
- /*
- * Warning: you may change this source, but if you do that
- * you need to change the _scg_version and _scg_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.
- */
- LOCAL char _scg_trans_version[] = "scsi-sgi.c-1.19"; /* 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 scg_local {
- short scgfiles[MAX_SCG][MAX_TGT][MAX_LUN];
- };
- #define scglocal(p) ((struct scg_local *)((p)->local))
- #endif
- #define MAX_DMA_SGI (256*1024) /* Check if this is not too big */
- #ifndef USE_DSLIB
- LOCAL int scsi_sendreq __PR((SCSI *scgp, int f, struct scg_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.
- */
- EXPORT char *
- scg__version(scgp, what)
- SCSI *scgp;
- int what;
- {
- if (scgp != (SCSI *)0) {
- switch (what) {
- case SCG_VERSION:
- return (_scg_trans_version);
- /*
- * If you changed this source, you are not allowed to
- * return "schily" for the SCG_AUTHOR request.
- */
- case SCG_AUTHOR:
- return (_scg_auth_schily);
- case SCG_SCCS_ID:
- return (__sccsid);
- }
- }
- return ((char *)0);
- }
- EXPORT int
- scsi_open(scgp, device, busno, tgt, tlun)
- SCSI *scgp;
- char *device;
- int busno;
- int tgt;
- int tlun;
- {
- 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 (scgp->errstr)
- js_snprintf(scgp->errstr, SCSI_ERRSTR_SIZE,
- "Illegal value for busno, target or lun '%d,%d,%d'",
- busno, tgt, tlun);
- return (-1);
- }
- if ((device != NULL && *device != ' ') || (busno == -2 && tgt == -2)) {
- errno = EINVAL;
- if (scgp->errstr)
- js_snprintf(scgp->errstr, SCSI_ERRSTR_SIZE,
- "Open by 'devname' not supported on this OS");
- return (-1);
- }
- if (scgp->local == NULL) {
- scgp->local = malloc(sizeof(struct scg_local));
- if (scgp->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++)
- scglocal(scgp)->scgfiles[b][t][l] = (short)-1;
- }
- }
- }
- if (busno >= 0 && tgt >= 0 && tlun >= 0) {
- sprintf(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)
- return(-1);
- scglocal(scgp)->scgfiles[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++) {
- sprintf(devname, "/dev/scsi/sc%dd%dl%d", b, t, l);
- f = open(devname, O_RDWR);
- if (f >= 0) {
- scglocal(scgp)->scgfiles[b][t][l] = (short)f;
- nopen++;
- }
- }
- }
- }
- #endif
- }
- return (nopen);
- }
- EXPORT int
- scsi_close(scgp)
- SCSI *scgp;
- {
- #ifndef USE_DSLIB
- register int f;
- register int b;
- register int t;
- register int l;
- if (scgp->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 = scglocal(scgp)->scgfiles[b][t][l];
- if (f >= 0)
- close(f);
- scglocal(scgp)->scgfiles[b][t][l] = (short)-1;
- }
- }
- #else
- dsclose(dsp);
- #endif
- return (0);
- }
- LOCAL long
- scsi_maxdma(scgp)
- SCSI *scgp;
- {
- return (MAX_DMA_SGI);
- }
- EXPORT void *
- scsi_getbuf(scgp, amt)
- SCSI *scgp;
- long amt;
- {
- if (amt <= 0 || amt > scsi_maxdma(scgp))
- return ((void *)0);
- if (scgp->debug)
- printf("scsi_getbuf: %ld bytesn", amt);
- scgp->bufbase = valloc((size_t)(amt));
- return (scgp->bufbase);
- }
- EXPORT void
- scsi_freebuf(scgp)
- SCSI *scgp;
- {
- if (scgp->bufbase)
- free(scgp->bufbase);
- scgp->bufbase = NULL;
- }
- EXPORT
- BOOL scsi_havebus(scgp, busno)
- SCSI *scgp;
- int busno;
- {
- register int t;
- register int l;
- if (busno < 0 || busno >= MAX_SCG)
- return (FALSE);
- if (scgp->local == NULL)
- return (FALSE);
- for (t=0; t < MAX_TGT; t++) {
- for (l=0; l < MAX_LUN ; l++)
- if (scglocal(scgp)->scgfiles[busno][t][l] >= 0)
- return (TRUE);
- }
- return (FALSE);
- }
- EXPORT
- int scsi_fileno(scgp, busno, tgt, tlun)
- SCSI *scgp;
- 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 (scgp->local == NULL)
- return (-1);
- return ((int)scglocal(scgp)->scgfiles[busno][tgt][tlun]);
- #endif
- }
- EXPORT int
- scsi_initiator_id(scgp)
- SCSI *scgp;
- {
- return (-1);
- }
- EXPORT
- int scsi_isatapi(scgp)
- SCSI *scgp;
- {
- return (FALSE);
- }
- EXPORT
- int scsireset(scgp)
- SCSI *scgp;
- {
- /*
- * Do we have a SCSI reset on SGI?
- */
- #ifdef DS_RESET
- int f = scsi_fileno(scgp, scgp->scsibus, scgp->target, scgp->lun);
- return (ioctl(f, DS_RESET, 0));
- #else
- return (-1);
- #endif
- }
- #ifndef USE_DSLIB
- LOCAL int
- scsi_sendreq(scgp, f, sp, dsp)
- SCSI *scgp;
- int f;
- struct scg_cmd *sp;
- struct dsreq *dsp;
- {
- int ret;
- int retries = 4;
- u_char status;
- /* if ((sp->flags & SCG_CMD_RETRY) == 0)*/
- /* retries = 0;*/
- while (--retries > 0) {
- ret = ioctl(f, 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;
- scsitimes(scgp);
- if (sp->cdb.g0_cdb.cmd == SC_TEST_UNIT_READY &&
- scgp->cmdstop->tv_sec < to.tv_sec ||
- (scgp->cmdstop->tv_sec == to.tv_sec &&
- scgp->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
- LOCAL int
- scsi_send(scgp, f, sp)
- SCSI *scgp;
- int f;
- struct scg_cmd *sp;
- {
- 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 (f < 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) = 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(f, dsp);
- #else
- ret = scsi_sendreq(scgp, f, 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);
- }