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freebsd-skq/sys/scsi/st.c
Rodney W. Grimes 5b81b6b301 Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00

1775 lines
45 KiB
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/*
* Written by Julian Elischer (julian@tfs.com)
* for TRW Financial Systems for use under the MACH(2.5) operating system.
*
* TRW Financial Systems, in accordance with their agreement with Carnegie
* Mellon University, makes this software available to CMU to distribute
* or use in any manner that they see fit as long as this message is kept with
* the software. For this reason TFS also grants any other persons or
* organisations permission to use or modify this software.
*
* TFS supplies this software to be publicly redistributed
* on the understanding that TFS is not responsible for the correct
* functioning of this software in any circumstances.
*
*
* PATCHES MAGIC LEVEL PATCH THAT GOT US HERE
* -------------------- ----- ----------------------
* CURRENT PATCH LEVEL: 1 00098
* -------------------- ----- ----------------------
*
* 16 Feb 93 Julian Elischer ADDED for SCSI system
*/
/*
* Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
*/
/*
* To do:
* work out some better way of guessing what a good timeout is going
* to be depending on whether we expect to retension or not.
*
*/
#include <sys/types.h>
#include <st.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/mtio.h>
#if defined(OSF)
#define SECSIZE 512
#endif /* defined(OSF) */
#include <scsi/scsi_all.h>
#include <scsi/scsi_tape.h>
#include <scsi/scsiconf.h>
long int ststrats,stqueues;
#define PAGESIZ 4096
#define STQSIZE 4
#define ST_RETRIES 4
#define MODE(z) ( (minor(z) & 0x03) )
#define DSTY(z) ( ((minor(z) >> 2) & 0x03) )
#define UNIT(z) ( (minor(z) >> 4) )
#define DSTY_QIC120 3
#define DSTY_QIC150 2
#define DSTY_QIC525 1
#define QIC120 0x0f
#define QIC150 0x10
#define QIC525 0x11
#ifndef __386BSD__
struct buf stbuf[NST][STQSIZE]; /* buffer for raw io (one per device) */
struct buf *stbuf_free[NST]; /* queue of free buffers for raw io */
#endif __386BSD__
struct buf st_buf_queue[NST];
int ststrategy();
void stminphys();
struct scsi_xfer st_scsi_xfer[NST];
int st_xfer_block_wait[NST];
#if defined(OSF)
caddr_t st_window[NST];
#endif /* defined(OSF) */
#ifndef MACH
#define ESUCCESS 0
#endif MACH
int st_info_valid[NST]; /* the info about the device is valid */
int st_initialized[NST] ;
int st_debug = 0;
int stattach();
int st_done();
struct st_data
{
int flags;
struct scsi_switch *sc_sw; /* address of scsi low level switch */
int ctlr; /* so they know which one we want */
int targ; /* our scsi target ID */
int lu; /* out scsi lu */
int blkmin; /* min blk size */
int blkmax; /* max blk size */
int numblks; /* nominal blocks capacity */
int blksiz; /* nominal block size */
}st_data[NST];
#define ST_OPEN 0x01
#define ST_NOREWIND 0x02
#define ST_WRITTEN 0x04
#define ST_FIXEDBLOCKS 0x10
#define ST_AT_FILEMARK 0x20
#define ST_AT_EOM 0x40
#define ST_PER_ACTION (ST_AT_FILEMARK | ST_AT_EOM)
#define ST_PER_OPEN (ST_OPEN | ST_NOREWIND | ST_WRITTEN | ST_PER_ACTION)
#define ST_PER_MEDIA ST_FIXEDBLOCKS
static int next_st_unit = 0;
/***********************************************************************\
* The routine called by the low level scsi routine when it discovers *
* A device suitable for this driver *
\***********************************************************************/
int stattach(ctlr,targ,lu,scsi_switch)
struct scsi_switch *scsi_switch;
{
int unit,i;
unsigned char *tbl;
struct st_data *st;
if(scsi_debug & PRINTROUTINES) printf("stattach: ");
/*******************************************************\
* Check we have the resources for another drive *
\*******************************************************/
unit = next_st_unit++;
if( unit >= NST)
{
printf("Too many scsi tapes..(%d > %d) reconfigure kernel",(unit + 1),NST);
return(0);
}
st = st_data + unit;
/*******************************************************\
* Store information needed to contact our base driver *
\*******************************************************/
st->sc_sw = scsi_switch;
st->ctlr = ctlr;
st->targ = targ;
st->lu = lu;
/*******************************************************\
* Use the subdriver to request information regarding *
* the drive. We cannot use interrupts yet, so the *
* request must specify this. *
\*******************************************************/
if((st_mode_sense(unit, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT)))
{
printf(" st%d: scsi tape drive, %d blocks of %d bytes\n",
unit, st->numblks, st->blksiz);
}
else
{
printf(" st%d: scsi tape drive :- offline\n", unit);
}
/*******************************************************\
* Set up the bufs for this device *
\*******************************************************/
#ifndef __386BSD__
stbuf_free[unit] = (struct buf *)0;
for (i = 1; i < STQSIZE; i++)
{
stbuf[unit][i].b_forw = stbuf_free[unit];
stbuf_free[unit]=&stbuf[unit][i];
}
#endif __386BSD__
st_buf_queue[unit].b_active = 0;
st_buf_queue[unit].b_actf = st_buf_queue[unit].b_actl = 0;
st_initialized[unit] = 1;
#if defined(OSF)
st_window[unit] = (caddr_t)alloc_kva(SECSIZE*256+PAGESIZ);
#endif /* defined(OSF) */
return;
}
/*******************************************************\
* open the device. *
\*******************************************************/
stopen(dev)
{
int errcode = 0;
int unit,mode,dsty;
int dsty_code;
struct st_data *st;
unit = UNIT(dev);
mode = MODE(dev);
dsty = DSTY(dev);
st = st_data + unit;
/*******************************************************\
* Check the unit is legal *
\*******************************************************/
if ( unit >= NST )
{
errcode = ENXIO;
return(errcode);
}
/*******************************************************\
* Only allow one at a time *
\*******************************************************/
if(st->flags & ST_OPEN)
{
errcode = ENXIO;
goto bad;
}
/*******************************************************\
* Set up the mode flags according to the minor number *
* ensure all open flags are in a known state *
\*******************************************************/
st->flags &= ~ST_PER_OPEN;
switch(mode)
{
case 2:
case 0:
st->flags &= ~ST_NOREWIND;
break;
case 3:
case 1:
st->flags |= ST_NOREWIND;
break;
default:
printf("st%d: Bad mode (minor number)%d\n",unit,mode);
return(EINVAL);
}
/*******************************************************\
* Check density code: 0 is drive default *
\*******************************************************/
switch(dsty)
{
case 0: dsty_code = 0; break;
case DSTY_QIC120: dsty_code = QIC120; break;
case DSTY_QIC150: dsty_code = QIC150; break;
case DSTY_QIC525: dsty_code = QIC525; break;
default:
printf("st%d: Bad density (minor number)%d\n",unit,dsty);
return(EINVAL);
}
if(scsi_debug & (PRINTROUTINES | TRACEOPENS))
printf("stopen: dev=0x%x (unit %d (of %d))\n"
, dev, unit, NST);
/*******************************************************\
* Make sure the device has been initialised *
\*******************************************************/
if (!st_initialized[unit])
return(ENXIO);
/*******************************************************\
* Check that it is still responding and ok. *
\*******************************************************/
if(scsi_debug & TRACEOPENS)
printf("device is ");
if (!(st_req_sense(unit, 0)))
{
errcode = ENXIO;
if(scsi_debug & TRACEOPENS)
printf("not responding\n");
goto bad;
}
if(scsi_debug & TRACEOPENS)
printf("ok\n");
if(!(st_test_ready(unit,0)))
{
printf("st%d not ready\n",unit);
return(EIO);
}
if(!st_info_valid[unit]) /* is media new? */
if(!st_load(unit,LD_LOAD,0))
{
return(EIO);
}
if(!st_rd_blk_lim(unit,0))
{
return(EIO);
}
if(!st_mode_sense(unit,0))
{
return(EIO);
}
if(!st_mode_select(unit,0,dsty_code))
{
return(EIO);
}
st_info_valid[unit] = TRUE;
st_prevent(unit,PR_PREVENT,0); /* who cares if it fails? */
/*******************************************************\
* Load the physical device parameters *
\*******************************************************/
if(scsi_debug & TRACEOPENS)
printf("Params loaded ");
st->flags |= ST_OPEN;
bad:
return(errcode);
}
/*******************************************************\
* close the device.. only called if we are the LAST *
* occurence of an open device *
\*******************************************************/
stclose(dev)
{
unsigned char unit,mode;
struct st_data *st;
unit = UNIT(dev);
mode = MODE(dev);
st = st_data + unit;
if(scsi_debug & TRACEOPENS)
printf("Closing device");
if(st->flags & ST_WRITTEN)
{
st_write_filemarks(unit,1,0);
}
st->flags &= ~ST_WRITTEN;
switch(mode)
{
case 0:
st_rewind(unit,FALSE,SCSI_SILENT);
st_prevent(unit,PR_ALLOW,SCSI_SILENT);
break;
case 1:
st_prevent(unit,PR_ALLOW,SCSI_SILENT);
break;
case 2:
st_rewind(unit,FALSE,SCSI_SILENT);
st_prevent(unit,PR_ALLOW,SCSI_SILENT);
st_load(unit,LD_UNLOAD,SCSI_SILENT);
break;
case 3:
st_prevent(unit,PR_ALLOW,SCSI_SILENT);
st_load(unit,LD_UNLOAD,SCSI_SILENT);
break;
default:
printf("st%d:close: Bad mode (minor number)%d how's it open?\n"
,unit,mode);
return(EINVAL);
}
st->flags &= ~ST_PER_OPEN;
return(0);
}
#ifndef __386BSD__
/*******************************************************\
* Get ownership of this unit's buf *
* If need be, sleep on it, until it comes free *
\*******************************************************/
struct buf *
st_get_buf(unit) {
struct buf *rc;
while (!(rc = stbuf_free[unit]))
sleep((caddr_t)&stbuf_free[unit], PRIBIO+1);
stbuf_free[unit] = stbuf_free[unit]->b_forw;
rc->b_error = 0;
rc->b_resid = 0;
rc->b_flags = 0;
return(rc);
}
/*******************************************************\
* Free this unit's buf, wake processes waiting for it *
\*******************************************************/
st_free_buf(unit,bp)
struct buf *bp;
{
if (!stbuf_free[unit])
wakeup((caddr_t)&stbuf_free[unit]);
bp->b_forw = stbuf_free[unit];
stbuf_free[unit] = bp;
}
/*******************************************************\
* Get the buf for this unit and use physio to do it *
\*******************************************************/
stread(dev,uio)
register short dev;
struct uio *uio;
{
int unit = UNIT(dev);
struct buf *bp = st_get_buf(unit);
int rc;
rc = physio(ststrategy, bp, dev, B_READ, stminphys, uio);
st_free_buf(unit,bp);
return(rc);
}
/*******************************************************\
* Get the buf for this unit and use physio to do it *
\*******************************************************/
stwrite(dev,uio)
dev_t dev;
struct uio *uio;
{
int unit = UNIT(dev);
struct buf *bp = st_get_buf(unit);
int rc;
rc = physio(ststrategy, bp, dev, B_WRITE, stminphys, uio);
st_free_buf(unit,bp);
return(rc);
}
#endif __386BSD__
/*******************************************************\
* trim the size of the transfer if needed, *
* called by physio *
* basically the smaller of our min and the scsi driver's*
* minphys *
\*******************************************************/
void stminphys(bp)
struct buf *bp;
{
(*(st_data[UNIT(bp->b_dev)].sc_sw->scsi_minphys))(bp);
}
/*******************************************************\
* Actually translate the requested transfer into *
* one the physical driver can understand *
* The transfer is described by a buf and will include *
* only one physical transfer. *
\*******************************************************/
int ststrategy(bp)
struct buf *bp;
{
struct buf *dp;
unsigned char unit;
unsigned int opri;
ststrats++;
unit = UNIT((bp->b_dev));
if(scsi_debug & PRINTROUTINES) printf("\nststrategy ");
if(scsi_debug & SHOWREQUESTS) printf("st%d: %d bytes @ blk%d\n",
unit,bp->b_bcount,bp->b_blkno);
/*******************************************************\
* If it's a null transfer, return immediatly *
\*******************************************************/
if (bp->b_bcount == 0) {
goto done;
}
/*******************************************************\
* Odd sized request on fixed drives are verboten *
\*******************************************************/
if((st_data[unit].flags & ST_FIXEDBLOCKS)
&& bp->b_bcount % st_data[unit].blkmin)
{
printf("st%d: bad request, must be multiple of %d\n",
unit, st_data[unit].blkmin);
bp->b_error = EIO;
goto bad;
}
#ifdef __386BSD__
stminphys(bp);
#endif __386BSD__
opri = splbio();
dp = &st_buf_queue[unit];
/*******************************************************\
* Place it in the queue of disk activities for this tape*
* at the end *
\*******************************************************/
while ( dp->b_actf)
{
dp = dp->b_actf;
}
dp->b_actf = bp;
bp->b_actf = NULL;
/*******************************************************\
* Tell the device to get going on the transfer if it's *
* not doing anything, otherwise just wait for completion*
\*******************************************************/
ststart(unit);
splx(opri);
return;
bad:
bp->b_flags |= B_ERROR;
done:
/*******************************************************\
* Correctly set the buf to indicate a completed xfer *
\*******************************************************/
iodone(bp);
return;
}
/***************************************************************\
* ststart looks to see if there is a buf waiting for the device *
* and that the device is not already busy. If both are true, *
* It deques the buf and creates a scsi command to perform the *
* transfer in the buf. The transfer request will call st_done *
* on completion, which will in turn call this routine again *
* so that the next queued transfer is performed. *
* The bufs are queued by the strategy routine (ststrategy) *
* *
* This routine is also called after other non-queued requests *
* have been made of the scsi driver, to ensure that the queue *
* continues to be drained. *
\***************************************************************/
/* ststart() is called at splbio */
ststart(unit)
{
int drivecount;
register struct buf *bp = 0;
register struct buf *dp;
struct scsi_xfer *xs;
struct scsi_rw_tape cmd;
int blkno, nblk;
struct st_data *st;
st = st_data + unit;
if(scsi_debug & PRINTROUTINES) printf("ststart%d ",unit);
/*******************************************************\
* See if there is a buf to do and we are not already *
* doing one *
\*******************************************************/
xs=&st_scsi_xfer[unit];
if(xs->flags & INUSE)
{
return; /* unit already underway */
}
trynext:
if(st_xfer_block_wait[unit]) /* a special awaits, let it proceed first */
{
wakeup(&st_xfer_block_wait[unit]);
return;
}
dp = &st_buf_queue[unit];
if ((bp = dp->b_actf) != NULL)
{
dp->b_actf = bp->b_actf;
}
else /* no work to do */
{
return;
}
xs->flags = INUSE; /* Now ours */
/*******************************************************\
* We have a buf, now we should move the data into *
* a scsi_xfer definition and try start it *
\*******************************************************/
/*******************************************************\
* If we are at a filemark but have not reported it yet *
* then we should report it now *
\*******************************************************/
if(st->flags & ST_AT_FILEMARK)
{
bp->b_error = 0;
bp->b_flags |= B_ERROR; /* EOF*/
st->flags &= ~ST_AT_FILEMARK;
biodone(bp);
xs->flags = 0; /* won't need it now */
goto trynext;
}
/*******************************************************\
* If we are at EOM but have not reported it yet *
* then we should report it now *
\*******************************************************/
if(st->flags & ST_AT_EOM)
{
bp->b_error = EIO;
bp->b_flags |= B_ERROR;
st->flags &= ~ST_AT_EOM;
biodone(bp);
xs->flags = 0; /* won't need it now */
goto trynext;
}
/*******************************************************\
* Fill out the scsi command *
\*******************************************************/
bzero(&cmd, sizeof(cmd));
if((bp->b_flags & B_READ) == B_WRITE)
{
st->flags |= ST_WRITTEN;
xs->flags |= SCSI_DATA_OUT;
}
else
{
xs->flags |= SCSI_DATA_IN;
}
cmd.op_code = (bp->b_flags & B_READ)
? READ_COMMAND_TAPE
: WRITE_COMMAND_TAPE;
/*******************************************************\
* Handle "fixed-block-mode" tape drives by using the *
* block count instead of the length. *
\*******************************************************/
if(st->flags & ST_FIXEDBLOCKS)
{
cmd.fixed = 1;
lto3b(bp->b_bcount/st->blkmin,cmd.len);
}
else
{
lto3b(bp->b_bcount,cmd.len);
}
/*******************************************************\
* Fill out the scsi_xfer structure *
* Note: we cannot sleep as we may be an interrupt *
\*******************************************************/
xs->flags |= SCSI_NOSLEEP;
xs->adapter = st->ctlr;
xs->targ = st->targ;
xs->lu = st->lu;
xs->retries = 1; /* can't retry on tape*/
xs->timeout = 100000; /* allow 100 secs for retension */
xs->cmd = (struct scsi_generic *)&cmd;
xs->cmdlen = sizeof(cmd);
xs->data = (u_char *)bp->b_un.b_addr;
xs->datalen = bp->b_bcount;
xs->resid = bp->b_bcount;
xs->when_done = st_done;
xs->done_arg = unit;
xs->done_arg2 = (int)xs;
xs->error = XS_NOERROR;
xs->bp = bp;
/*******************************************************\
* Pass all this info to the scsi driver. *
\*******************************************************/
#if defined(OSF)||defined(FIX_ME)
if (bp->b_flags & B_PHYS) {
xs->data = (u_char*)map_pva_kva(bp->b_proc, bp->b_un.b_addr,
bp->b_bcount, st_window[unit],
(bp->b_flags&B_READ)?B_WRITE:B_READ);
} else {
xs->data = (u_char*)bp->b_un.b_addr;
}
#endif /* defined(OSF) */
if ( (*(st->sc_sw->scsi_cmd))(xs) != SUCCESSFULLY_QUEUED)
{
printf("st%d: oops not queued",unit);
xs->error = XS_DRIVER_STUFFUP;
st_done(unit,xs);
}
stqueues++;
}
/*******************************************************\
* This routine is called by the scsi interrupt when *
* the transfer is complete.
\*******************************************************/
int st_done(unit,xs)
int unit;
struct scsi_xfer *xs;
{
struct buf *bp;
int retval;
if(scsi_debug & PRINTROUTINES) printf("st_done%d ",unit);
if (! (xs->flags & INUSE))
panic("scsi_xfer not in use!");
if(bp = xs->bp)
{
switch(xs->error)
{
case XS_NOERROR:
bp->b_flags &= ~B_ERROR;
bp->b_error = 0;
bp->b_resid = 0;
break;
case XS_SENSE:
retval = (st_interpret_sense(unit,xs));
if(retval)
{
/***************************************\
* We have a real error, the bit should *
* be set to indicate this. The return *
* value will contain the unix error code*
* that the error interpretation routine *
* thought was suitable, so pass this *
* value back in the buf structure. *
* Furthermore we return information *
* saying that no data was transferred *
\***************************************/
bp->b_flags |= B_ERROR;
bp->b_error = retval;
bp->b_resid = bp->b_bcount;
st_data[unit].flags
&= ~(ST_AT_FILEMARK|ST_AT_EOM);
}
else
{
/***********************************************\
* The error interpretation code has declared *
* that it wasn't a real error, or at least that *
* we should be ignoring it if it was. *
\***********************************************/
if(xs->resid && ( xs->resid != xs->datalen ))
{
/***************************************\
* Here we have the tricky part.. *
* We successfully read less data than *
* we requested. (but not 0) *
*------for variable blocksize tapes:----*
* UNDER 386BSD: *
* We should legitimatly have the error *
* bit set, with the error value set to *
* zero.. This is to indicate to the *
* physio code that while we didn't get *
* as much information as was requested, *
* we did reach the end of the record *
* and so physio should not call us *
* again for more data... we have it all *
* SO SET THE ERROR BIT! *
* *
* UNDER MACH:(CMU) *
* To indicate the same as above, we *
* need only have a non 0 resid that is *
* less than the b_bcount, but the *
* ERROR BIT MUST BE CLEAR! (sigh) *
* *
* UNDER OSF1: *
* To indicate the same as above, we *
* need to have a non 0 resid that is *
* less than the b_bcount, but the *
* ERROR BIT MUST BE SET! (gasp)(sigh) *
* *
*-------for fixed blocksize device------*
* We could have read some successful *
* records before hitting *
* the EOF or EOT. These must be passed *
* to the user, before we report the *
* EOx. Only if there is no data for the *
* user do we report it now. (via an EIO *
* for EOM and resid == count for EOF). *
* We will report the EOx NEXT time.. *
\***************************************/
#ifdef MACH /*osf and cmu varieties */
#ifdef OSF
bp->b_flags |= B_ERROR;
#else OSF
bp->b_flags &= ~B_ERROR;
#endif OSF
#endif MACH
#ifdef __386BSD__
bp->b_flags |= B_ERROR;
#endif __386BSD__
bp->b_error = 0;
bp->b_resid = xs->resid;
if((st_data[unit].flags & ST_FIXEDBLOCKS))
{
bp->b_resid *= st_data[unit].blkmin;
if( (st_data[unit].flags & ST_AT_EOM)
&& (bp->b_resid == bp->b_bcount))
{
bp->b_error = EIO;
st_data[unit].flags
&= ~ST_AT_EOM;
}
}
xs->error = XS_NOERROR;
break;
}
else
{
/***************************************\
* We have come out of the error handler *
* with no error code.. we have also *
* not had an ili (would have gone to *
* the previous clause). Now we need to *
* distiguish between succesful read of *
* no data (EOF or EOM) and successfull *
* read of all requested data. *
* At least all o/s agree that: *
* 0 bytes read with no error is EOF *
* 0 bytes read with an EIO is EOM *
\***************************************/
bp->b_resid = bp->b_bcount;
if(st_data[unit].flags & ST_AT_FILEMARK)
{
st_data[unit].flags &= ~ST_AT_FILEMARK;
bp->b_flags &= ~B_ERROR;
bp->b_error = 0;
break;
}
if(st_data[unit].flags & ST_AT_EOM)
{
bp->b_flags |= B_ERROR;
bp->b_error = EIO;
st_data[unit].flags &= ~ST_AT_EOM;
break;
}
printf("st%d:error ignored\n" ,unit);
}
}
break;
case XS_TIMEOUT:
printf("st%d timeout\n",unit);
break;
case XS_BUSY: /* should retry */ /* how? */
/************************************************/
/* SHOULD put buf back at head of queue */
/* and decrement retry count in (*xs) */
/* HOWEVER, this should work as a kludge */
/************************************************/
if(xs->retries--)
{
xs->flags &= ~ITSDONE;
xs->error = XS_NOERROR;
if ( (*(st_data[unit].sc_sw->scsi_cmd))(xs)
== SUCCESSFULLY_QUEUED)
{ /* don't wake the job, ok? */
return;
}
printf("device busy");
xs->flags |= ITSDONE;
}
case XS_DRIVER_STUFFUP:
bp->b_flags |= B_ERROR;
bp->b_error = EIO;
break;
default:
printf("st%d: unknown error category from scsi driver\n"
,unit);
}
biodone(bp);
xs->flags = 0; /* no longer in use */
ststart(unit); /* If there's another waiting.. do it */
}
else
{
wakeup(xs);
}
}
/*******************************************************\
* Perform special action on behalf of the user *
* Knows about the internals of this device *
\*******************************************************/
stioctl(dev, cmd, arg, mode)
dev_t dev;
int cmd;
caddr_t arg;
{
register i,j;
unsigned int opri;
int errcode = 0;
unsigned char unit;
int number,flags,ret;
/*******************************************************\
* Find the device that the user is talking about *
\*******************************************************/
flags = 0; /* give error messages, act on errors etc. */
unit = UNIT(dev);
switch(cmd)
{
case MTIOCGET:
{
struct mtget *g = (struct mtget *) arg;
bzero(g, sizeof(struct mtget));
g->mt_type = 0x7; /* Ultrix compat */ /*?*/
ret=TRUE;
break;
}
case MTIOCTOP:
{
struct mtop *mt = (struct mtop *) arg;
if (st_debug)
printf("[sctape_sstatus: %x %x]\n",
mt->mt_op, mt->mt_count);
/* compat: in U*x it is a short */
number = mt->mt_count;
switch ((short)(mt->mt_op))
{
case MTWEOF: /* write an end-of-file record */
ret = st_write_filemarks(unit,number,flags);
st_data[unit].flags &= ~ST_WRITTEN;
break;
case MTFSF: /* forward space file */
ret = st_space(unit,number,SP_FILEMARKS,flags);
break;
case MTBSF: /* backward space file */
ret = st_space(unit,-number,SP_FILEMARKS,flags);
break;
case MTFSR: /* forward space record */
ret = st_space(unit,number,SP_BLKS,flags);
break;
case MTBSR: /* backward space record */
ret = st_space(unit,-number,SP_BLKS,flags);
break;
case MTREW: /* rewind */
ret = st_rewind(unit,FALSE,flags);
break;
case MTOFFL: /* rewind and put the drive offline */
if((ret = st_rewind(unit,FALSE,flags)))
{
st_prevent(unit,PR_ALLOW,0);
ret = st_load(unit,LD_UNLOAD,flags);
}
else
{
printf("rewind failed, unit still loaded\n");
}
break;
case MTNOP: /* no operation, sets status only */
case MTCACHE: /* enable controller cache */
case MTNOCACHE: /* disable controller cache */
ret = TRUE;;
break;
default:
return EINVAL;
}
break;
}
case MTIOCIEOT:
case MTIOCEEOT:
ret=TRUE;
break;
}
return(ret?ESUCCESS:EIO);
}
/*******************************************************\
* Check with the device that it is ok, (via scsi driver)*
\*******************************************************/
st_req_sense(unit, flags)
int flags;
{
struct scsi_sense_data sense;
struct scsi_sense scsi_cmd;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = REQUEST_SENSE;
scsi_cmd.length = sizeof(sense);
if (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
&sense,
sizeof(sense),
100000,
flags | SCSI_DATA_IN) != 0)
{
return(FALSE);
}
else
return(TRUE);
}
/*******************************************************\
* Get scsi driver to send a "are you ready" command *
\*******************************************************/
st_test_ready(unit,flags)
int unit,flags;
{
struct scsi_test_unit_ready scsi_cmd;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = TEST_UNIT_READY;
if (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
0,
0,
100000,
flags) != 0) {
return(FALSE);
} else
return(TRUE);
}
#ifdef __STDC__
#define b2tol(a) (((unsigned)(a##_1) << 8) + (unsigned)a##_0 )
#else
#define b2tol(a) (((unsigned)(a/**/_1) << 8) + (unsigned)a/**/_0 )
#endif
/*******************************************************\
* Ask the drive what it's min and max blk sizes are. *
\*******************************************************/
st_rd_blk_lim(unit, flags)
int unit,flags;
{
struct scsi_blk_limits scsi_cmd;
struct scsi_blk_limits_data scsi_blkl;
struct st_data *st = st_data + unit;
/*******************************************************\
* First check if we have it all loaded *
\*******************************************************/
if (st_info_valid[unit]) goto done;
/*******************************************************\
* do a 'Read Block Limits' *
\*******************************************************/
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = READ_BLK_LIMITS;
/*******************************************************\
* do the command, update the global values *
\*******************************************************/
if (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
&scsi_blkl,
sizeof(scsi_blkl),
5000,
flags | SCSI_DATA_IN) != 0)
{
if(!(flags & SCSI_SILENT))
printf("could not get blk limits for unit %d\n", unit);
st_info_valid[unit] = FALSE;
return(FALSE);
}
if (st_debug)
{
printf(" (%d <= blksiz <= %d\n) ",
b2tol(scsi_blkl.min_length),
_3btol(&scsi_blkl.max_length_2));
}
st->blkmin = b2tol(scsi_blkl.min_length);
st->blkmax = _3btol(&scsi_blkl.max_length_2);
done:
if(st->blkmin && (st->blkmin == st->blkmax))
{
st->flags |= ST_FIXEDBLOCKS;
}
return(TRUE);
}
/*******************************************************\
* Get the scsi driver to send a full inquiry to the *
* device and use the results to fill out the global *
* parameter structure. *
\*******************************************************/
st_mode_sense(unit, flags)
int unit,flags;
{
struct scsi_mode_sense scsi_cmd;
struct
{
struct scsi_mode_header_tape header;
struct blk_desc blk_desc;
}scsi_sense;
struct st_data *st = st_data + unit;
/*******************************************************\
* First check if we have it all loaded *
\*******************************************************/
if (st_info_valid[unit]) return(TRUE);
/*******************************************************\
* First do a mode sense *
\*******************************************************/
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = MODE_SENSE;
scsi_cmd.length = sizeof(scsi_sense);
/*******************************************************\
* do the command, but we don't need the results *
* just print them for our interest's sake *
\*******************************************************/
if (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
&scsi_sense,
sizeof(scsi_sense),
5000,
flags | SCSI_DATA_IN) != 0)
{
if(!(flags & SCSI_SILENT))
printf("could not mode sense for unit %d\n", unit);
st_info_valid[unit] = FALSE;
return(FALSE);
}
if (st_debug)
{
printf("unit %d: %d blocks of %d bytes, write %s, %sbuffered",
unit,
_3btol(&scsi_sense.blk_desc.nblocks),
_3btol(&scsi_sense.blk_desc.blklen),
(scsi_sense.header.write_protected ?
"protected" : "enabled"),
(scsi_sense.header.buf_mode ?
"" : "un")
);
}
st->numblks = _3btol(&scsi_sense.blk_desc.nblocks);
st->blksiz = _3btol(&scsi_sense.blk_desc.blklen);
return(TRUE);
}
/*******************************************************\
* Get the scsi driver to send a full inquiry to the *
* device and use the results to fill out the global *
* parameter structure. *
\*******************************************************/
st_mode_select(unit, flags, dsty_code)
int unit,flags,dsty_code;
{
struct scsi_mode_select scsi_cmd;
struct
{
struct scsi_mode_header_tape header;
struct blk_desc blk_desc;
}dat;
struct st_data *st = st_data + unit;
/*******************************************************\
* Set up for a mode select *
\*******************************************************/
bzero(&dat, sizeof(dat));
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = MODE_SELECT;
scsi_cmd.length = sizeof(dat);
dat.header.blk_desc_len = sizeof(struct blk_desc);
dat.header.buf_mode = 1;
dat.blk_desc.density = dsty_code;
if(st->flags & ST_FIXEDBLOCKS)
{
lto3b( st->blkmin , dat.blk_desc.blklen);
}
/* lto3b( st->numblks , dat.blk_desc.nblocks); use defaults!!!!
lto3b( st->blksiz , dat.blk_desc.blklen);
*/
/*******************************************************\
* do the command *
\*******************************************************/
if (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
&dat,
sizeof(dat),
5000,
flags | SCSI_DATA_OUT) != 0)
{
if(!(flags & SCSI_SILENT))
printf("could not mode select for unit %d\n", unit);
st_info_valid[unit] = FALSE;
return(FALSE);
}
return(TRUE);
}
/*******************************************************\
* skip N blocks/filemarks/seq filemarks/eom *
\*******************************************************/
st_space(unit,number,what,flags)
int unit,number,what,flags;
{
struct scsi_space scsi_cmd;
/* if we are at a filemark now, we soon won't be*/
st_data[unit].flags &= ~(ST_AT_FILEMARK | ST_AT_EOM);
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = SPACE;
scsi_cmd.code = what;
lto3b(number,scsi_cmd.number);
if (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
0,
0,
600000, /* 10 mins enough? */
flags) != 0)
{
if(!(flags & SCSI_SILENT))
printf("could not space st%d\n", unit);
st_info_valid[unit] = FALSE;
return(FALSE);
}
return(TRUE);
}
/*******************************************************\
* write N filemarks *
\*******************************************************/
st_write_filemarks(unit,number,flags)
int unit,number,flags;
{
struct scsi_write_filemarks scsi_cmd;
st_data[unit].flags &= ~(ST_AT_FILEMARK);
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = WRITE_FILEMARKS;
lto3b(number,scsi_cmd.number);
if (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
0,
0,
100000, /* 10 secs.. (may need to repos head )*/
flags) != 0)
{
if(!(flags & SCSI_SILENT))
printf("could not write_filemarks st%d\n", unit);
st_info_valid[unit] = FALSE;
return(FALSE);
}
return(TRUE);
}
/*******************************************************\
* load /unload (with retension if true) *
\*******************************************************/
st_load(unit,type,flags)
int unit,type,flags;
{
struct scsi_load scsi_cmd;
st_data[unit].flags &= ~(ST_AT_FILEMARK | ST_AT_EOM);
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = LOAD_UNLOAD;
scsi_cmd.load=type;
if (type == LD_LOAD)
{
/*scsi_cmd.reten=TRUE;*/
scsi_cmd.reten=FALSE;
}
else
{
scsi_cmd.reten=FALSE;
}
if (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
0,
0,
30000, /* 30 secs */
flags) != 0)
{
if(!(flags & SCSI_SILENT))
printf("cannot load/unload st%d\n", unit);
st_info_valid[unit] = FALSE;
return(FALSE);
}
return(TRUE);
}
/*******************************************************\
* Prevent or allow the user to remove the tape *
\*******************************************************/
st_prevent(unit,type,flags)
int unit,type,flags;
{
struct scsi_prevent scsi_cmd;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = PREVENT_ALLOW;
scsi_cmd.prevent=type;
if (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
0,
0,
5000,
flags) != 0)
{
if(!(flags & SCSI_SILENT))
printf("cannot prevent/allow on st%d\n", unit);
st_info_valid[unit] = FALSE;
return(FALSE);
}
return(TRUE);
}
/*******************************************************\
* Rewind the device *
\*******************************************************/
st_rewind(unit,immed,flags)
int unit,immed,flags;
{
struct scsi_rewind scsi_cmd;
st_data[unit].flags &= ~(ST_AT_FILEMARK | ST_AT_EOM);
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = REWIND;
scsi_cmd.immed=immed;
if (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
0,
0,
immed?5000:300000, /* 5 sec or 5 min */
flags) != 0)
{
if(!(flags & SCSI_SILENT))
printf("could not rewind st%d\n", unit);
st_info_valid[unit] = FALSE;
return(FALSE);
}
return(TRUE);
}
/*******************************************************\
* ask the scsi driver to perform a command for us. *
* Call it through the switch table, and tell it which *
* sub-unit we want, and what target and lu we wish to *
* talk to. Also tell it where to find the command *
* how long int is. *
* Also tell it where to read/write the data, and how *
* long the data is supposed to be *
\*******************************************************/
int st_scsi_cmd(unit,scsi_cmd,cmdlen,data_addr,datalen,timeout,flags)
int unit,flags;
struct scsi_generic *scsi_cmd;
int cmdlen;
int timeout;
u_char *data_addr;
int datalen;
{
struct scsi_xfer *xs;
int retval;
int s;
struct st_data *st = st_data + unit;
if(scsi_debug & PRINTROUTINES) printf("\nst_scsi_cmd%d ",unit);
if(st->sc_sw) /* If we have a scsi driver */
{
xs = &(st_scsi_xfer[unit]);
if(!(flags & SCSI_NOMASK))
s = splbio();
st_xfer_block_wait[unit]++; /* there is someone waiting */
while (xs->flags & INUSE)
{
sleep(&st_xfer_block_wait[unit],PRIBIO+1);
}
st_xfer_block_wait[unit]--;
xs->flags = INUSE;
if(!(flags & SCSI_NOMASK))
splx(s);
/*******************************************************\
* Fill out the scsi_xfer structure *
\*******************************************************/
xs->flags |= flags;
xs->adapter = st->ctlr;
xs->targ = st->targ;
xs->lu = st->lu;
xs->retries = ST_RETRIES;
xs->timeout = timeout;
xs->cmd = scsi_cmd;
xs->cmdlen = cmdlen;
xs->data = data_addr;
xs->datalen = datalen;
xs->resid = datalen;
xs->when_done = (flags & SCSI_NOMASK)
?(int (*)())0
:st_done;
xs->done_arg = unit;
xs->done_arg2 = (int)xs;
retry: xs->error = XS_NOERROR;
xs->bp = 0;
retval = (*(st->sc_sw->scsi_cmd))(xs);
switch(retval)
{
case SUCCESSFULLY_QUEUED:
s = splbio();
while(!(xs->flags & ITSDONE))
sleep(xs,PRIBIO+1);
splx(s);
case HAD_ERROR:
case COMPLETE:
switch(xs->error)
{
case XS_NOERROR:
retval = ESUCCESS;
break;
case XS_SENSE:
retval = (st_interpret_sense(unit,xs));
/* only useful for reads */
if (retval)
{ /* error... don't care about filemarks */
st->flags &= ~(ST_AT_FILEMARK
| ST_AT_EOM);
}
else
{
xs->error = XS_NOERROR;
retval = ESUCCESS;
}
break;
case XS_DRIVER_STUFFUP:
retval = EIO;
break;
case XS_TIMEOUT:
if(xs->retries-- )
{
xs->flags &= ~ITSDONE;
goto retry;
}
retval = EIO;
break;
case XS_BUSY:
if(xs->retries-- )
{
xs->flags &= ~ITSDONE;
goto retry;
}
retval = EIO;
break;
default:
retval = EIO;
printf("st%d: unknown error category from scsi driver\n"
,unit);
break;
}
break;
case TRY_AGAIN_LATER:
if(xs->retries-- )
{
xs->flags &= ~ITSDONE;
goto retry;
}
retval = EIO;
break;
default:
retval = EIO;
}
xs->flags = 0; /* it's free! */
ststart(unit);
}
else
{
printf("st%d: not set up\n",unit);
return(EINVAL);
}
return(retval);
}
/***************************************************************\
* Look at the returned sense and act on the error and detirmine *
* The unix error number to pass back... (0 = report no error) *
\***************************************************************/
int st_interpret_sense(unit,xs)
int unit;
struct scsi_xfer *xs;
{
struct scsi_sense_data *sense;
int key;
int silent = xs->flags & SCSI_SILENT;
/***************************************************************\
* If errors are ok, report a success *
\***************************************************************/
if(xs->flags & SCSI_ERR_OK) return(ESUCCESS);
/***************************************************************\
* Get the sense fields and work out what CLASS *
\***************************************************************/
sense = &(xs->sense);
if(st_debug)
{
int count = 0;
printf("code%x class%x valid%x\n"
,sense->error_code
,sense->error_class
,sense->valid);
printf("seg%x key%x ili%x eom%x fmark%x\n"
,sense->ext.extended.segment
,sense->ext.extended.sense_key
,sense->ext.extended.ili
,sense->ext.extended.eom
,sense->ext.extended.filemark);
printf("info: %x %x %x %x followed by %d extra bytes\n"
,sense->ext.extended.info[0]
,sense->ext.extended.info[1]
,sense->ext.extended.info[2]
,sense->ext.extended.info[3]
,sense->ext.extended.extra_len);
printf("extra: ");
while(count < sense->ext.extended.extra_len)
{
printf ("%x ",sense->ext.extended.extra_bytes[count++]);
}
printf("\n");
}
switch(sense->error_class)
{
/***************************************************************\
* If it's class 7, use the extended stuff and interpret the key *
\***************************************************************/
case 7:
{
if(sense->ext.extended.eom)
{
st_data[unit].flags |= ST_AT_EOM;
}
if(sense->ext.extended.filemark)
{
st_data[unit].flags |= ST_AT_FILEMARK;
}
if(sense->ext.extended.ili)
{
if(sense->valid)
{
/*******************************\
* In all ili cases, note that *
* the resid is non-0 AND not *
* unchanged. *
\*******************************/
xs->resid
= ntohl(*((long *)sense->ext.extended.info));
if(xs->bp)
{
if(xs->resid < 0)
{ /* never on block devices */
/***********************\
* it's only really bad *
* if we have lost data *
* (the record was *
* bigger than the read) *
\***********************/
return(EIO);
}
}
}
else
{ /* makes no sense.. complain */
printf("BAD length error?");
}
}/* there may be some other error. check the rest */
key=sense->ext.extended.sense_key;
switch(key)
{
case 0x0:
return(ESUCCESS);
case 0x1:
if(!silent)
{
printf("st%d: soft error(corrected) ", unit);
if(sense->valid)
{
printf("block no. %d (decimal)\n",
(sense->ext.extended.info[0] <<24)|
(sense->ext.extended.info[1] <<16)|
(sense->ext.extended.info[2] <<8)|
(sense->ext.extended.info[3] ));
}
else
{
printf("\n");
}
}
return(ESUCCESS);
case 0x2:
if(!silent) printf("st%d: not ready\n ", unit);
return(ENODEV);
case 0x3:
if(!silent)
{
printf("st%d: medium error ", unit);
if(sense->valid)
{
printf("block no. %d (decimal)\n",
(sense->ext.extended.info[0] <<24)|
(sense->ext.extended.info[1] <<16)|
(sense->ext.extended.info[2] <<8)|
(sense->ext.extended.info[3] ));
}
else
{
printf("\n");
}
}
return(EIO);
case 0x4:
if(!silent) printf("st%d: non-media hardware failure\n ",
unit);
return(EIO);
case 0x5:
if(!silent) printf("st%d: illegal request\n ", unit);
return(EINVAL);
case 0x6:
if(!silent) printf("st%d: Unit attention.\n ", unit);
st_data[unit].flags &= ~(ST_AT_FILEMARK|ST_AT_EOM);
st_info_valid[unit] = FALSE;
if (st_data[unit].flags & ST_OPEN) /* TEMP!!!! */
return(EIO);
else
return(ESUCCESS);
case 0x7:
if(!silent)
{
printf("st%d: attempted protection violation "
, unit);
if(sense->valid)
{
printf("block no. %d (decimal)\n",
(sense->ext.extended.info[0] <<24)|
(sense->ext.extended.info[1] <<16)|
(sense->ext.extended.info[2] <<8)|
(sense->ext.extended.info[3] ));
}
else
{
printf("\n");
}
}
return(EACCES);
case 0x8:
if(!silent)
{
printf("st%d: block wrong state (worm)\n "
, unit);
if(sense->valid)
{
printf("block no. %d (decimal)\n",
(sense->ext.extended.info[0] <<24)|
(sense->ext.extended.info[1] <<16)|
(sense->ext.extended.info[2] <<8)|
(sense->ext.extended.info[3] ));
}
else
{
printf("\n");
}
}
return(EIO);
case 0x9:
if(!silent) printf("st%d: vendor unique\n",
unit);
return(EIO);
case 0xa:
if(!silent) printf("st%d: copy aborted\n ",
unit);
return(EIO);
case 0xb:
if(!silent) printf("st%d: command aborted\n ",
unit);
return(EIO);
case 0xc:
if(!silent)
{
printf("st%d: search returned\n ", unit);
if(sense->valid)
{
printf("block no. %d (decimal)\n",
(sense->ext.extended.info[0] <<24)|
(sense->ext.extended.info[1] <<16)|
(sense->ext.extended.info[2] <<8)|
(sense->ext.extended.info[3] ));
}
else
{
printf("\n");
}
}
return(ESUCCESS);
case 0xd:
if(!silent) printf("st%d: volume overflow\n ",
unit);
return(ENOSPC);
case 0xe:
if(!silent)
{
printf("st%d: verify miscompare\n ", unit);
if(sense->valid)
{
printf("block no. %d (decimal)\n",
(sense->ext.extended.info[0] <<24)|
(sense->ext.extended.info[1] <<16)|
(sense->ext.extended.info[2] <<8)|
(sense->ext.extended.info[3] ));
}
else
{
printf("\n");
}
}
return(EIO);
case 0xf:
if(!silent) printf("st%d: unknown error key\n ",
unit);
return(EIO);
}
break;
}
/***************************************************************\
* If it's NOT class 7, just report it. *
\***************************************************************/
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
{
if(!silent) printf("st%d: error class %d code %d\n",
unit,
sense->error_class,
sense->error_code);
if(sense->valid)
if(!silent) printf("block no. %d (decimal)\n",
(sense->ext.unextended.blockhi <<16),
+ (sense->ext.unextended.blockmed <<8),
+ (sense->ext.unextended.blocklow ));
}
return(EIO);
}
}
#if defined(OSF)
stsize(dev_t dev)
{
printf("stsize() -- not implemented\n");
return(0);
}
stdump()
{
printf("stdump() -- not implemented\n");
return(-1);
}
#endif /* defined(OSF) */
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