www.pudn.com > cdrecord.zip > scsi-sgi.c
/* @(#)scsi-sgi.c 1.9 98/08/16 Copyright 1997 J. Schilling */
#ifndef lint
static char __sccsid[] =
"@(#)scsi-sgi.c 1.9 98/08/16 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"
*
* Actual implementation supports all scg features.
*
* 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
#ifdef USE_DSLIB
struct dsreq * dsp = 0;
#define MAX_SCG 1 /* Max # of SCSI controllers */
#else
#define MAX_SCG 4 /* Max # of SCSI controllers */
#define MAX_TGT 8
#define MAX_LUN 8
LOCAL short scgfiles[MAX_SCG][MAX_TGT][MAX_LUN];
#endif
#define MAX_DMA_SGI (256*1024) /* Check if this is not too big */
#ifndef USE_DSLIB
LOCAL int scsi_sendreq __PR((int f, struct scg_cmd *sp, struct dsreq *dsp));
#endif
LOCAL int scsi_send __PR((int f, struct scg_cmd *sp));
extern int scsibus;
extern int target;
extern int lun;
EXPORT
int scsi_open(device, busno, tgt, tlun)
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];
for (b=0; b < MAX_SCG; b++) {
for (t=0; t < MAX_TGT; t++) {
for (l=0; l < MAX_LUN ; l++)
scgfiles[b][t][l] = (short)-1;
}
}
if (scsibus >= 0 && target >= 0 && lun >= 0) {
if (scsibus >= MAX_SCG || target >= MAX_TGT || lun >= MAX_LUN)
return (-1);
sprintf(devname, "/dev/scsi/sc%dd%dl%d", scsibus, target, lun);
#ifdef USE_DSLIB
dsp = dsopen(devname, O_RDWR);
if (dsp == 0)
return(-1);
#else
f = open(devname, O_RDWR);
if (f < 0)
return(-1);
scgfiles[scsibus][target][lun] = 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) {
scgfiles[b][t][l] = (short)f;
nopen++;
}
}
}
}
#endif
}
return (nopen);
}
LOCAL long
scsi_maxdma()
{
return (MAX_DMA_SGI);
}
EXPORT void *
scsi_getbuf(amt)
long amt;
{
void *ret;
if (scg_maxdma == 0)
scg_maxdma = scsi_maxdma();
if (amt <= 0 || amt > scg_maxdma)
return ((void *)0);
if (debug)
printf("scsi_getbuf: %ld bytes\n", amt);
ret = valloc((size_t)(amt));
return (ret);
}
EXPORT
BOOL scsi_havebus(busno)
int busno;
{
register int t;
register int l;
if (busno < 0 || busno >= MAX_SCG)
return (FALSE);
for (t=0; t < MAX_TGT; t++) {
for (l=0; l < MAX_LUN ; l++)
if (scgfiles[busno][t][l] >= 0)
return (TRUE);
}
return (FALSE);
}
EXPORT
int scsi_fileno(busno, tgt, tlun)
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);
return ((int)scgfiles[busno][tgt][tlun]);
#endif
}
EXPORT
int scsi_isatapi()
{
return (FALSE);
}
EXPORT
int scsireset()
{
/*
* Do we have a SCSI reset on SGI?
*/
#ifdef DS_RESET
int f = scsi_fileno(scsibus, target, lun);
return (ioctl(f, DS_RESET, 0));
#else
return (-1);
#endif
}
#ifndef USE_DSLIB
LOCAL int
scsi_sendreq(f, sp, dsp)
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();
if (sp->cdb.g0_cdb.cmd == SC_TEST_UNIT_READY &&
cmdstop.tv_sec < to.tv_sec ||
(cmdstop.tv_sec == to.tv_sec &&
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(f, sp)
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(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);
}