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From: nate@cs.montana.edu (Nate Williams)
Subject: FWD: new scsi/st.c
Message-ID: <1993May26.185105.212@coe.montana.edu>
Sender: usenet@coe.montana.edu (USENET News System)
Organization: CS
Date: Wed, 26 May 1993 18:51:05 GMT
Lines: 2179
-------------------
From: Julian Elischer <julian@jules.dialix.oz.au>
This is a new st.c (scsi tape driver).
I will also be sending out some changed .h files and a version of mt
that can manipulate this driver.
julian
# This is a shell archive. Save it in a file, remove anything before
# this line, and then unpack it by entering "sh file". Note, it may
# create directories; files and directories will be owned by you and
# have default permissions.
#
# This archive contains:
#
# scsi/st.c
#
echo x - scsi/st.c
sed 's/^X//' >scsi/st.c << 'END-of-scsi/st.c'
X/*
X * Written by Julian Elischer (julian@tfs.com)
X * for TRW Financial Systems for use under the MACH(2.5) operating system.
X *
X * TRW Financial Systems, in accordance with their agreement with Carnegie
X * Mellon University, makes this software available to CMU to distribute
X * or use in any manner that they see fit as long as this message is kept with
X * the software. For this reason TFS also grants any other persons or
X * organisations permission to use or modify this software.
X *
X * TFS supplies this software to be publicly redistributed
X * on the understanding that TFS is not responsible for the correct
X * functioning of this software in any circumstances.
X *
X *
X * PATCHES MAGIC LEVEL PATCH THAT GOT US HERE
X * -------------------- ----- ----------------------
X * CURRENT PATCH LEVEL: 1 00098
X * -------------------- ----- ----------------------
X *
X * 16 Feb 93 Julian Elischer ADDED for SCSI system
X */
X
X/*
X * Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
X * major changes by Julian Elischer (julian@jules.dialix.oz.au) May 1993
X */
X
X
X/*
X * To do:
X * work out some better way of guessing what a good timeout is going
X * to be depending on whether we expect to retension or not.
X *
X */
X
X#include <sys/types.h>
X#include <st.h>
X
X#include <sys/param.h>
X#include <sys/systm.h>
X
X#include <sys/errno.h>
X#include <sys/ioctl.h>
X#include <sys/buf.h>
X#include <sys/proc.h>
X#include <sys/user.h>
X#include <sys/mtio.h>
X
X#if defined(OSF)
X#define SECSIZE 512
X#endif /* defined(OSF) */
X
X#include <scsi/scsi_all.h>
X#include <scsi/scsi_tape.h>
X#include <scsi/scsiconf.h>
X
X
Xlong int ststrats,stqueues;
X
X/* Defines for device specific stuff */
X#define PAGE_0_SENSE_DATA_SIZE 12
X#define PAGESIZ 4096
X#define DEF_FIXED_BSIZE 512
X#define STQSIZE 4
X#define ST_RETRIES 4
X
X
X#define MODE(z) ( (minor(z) & 0x03) )
X#define DSTY(z) ( ((minor(z) >> 2) & 0x03) )
X#define UNIT(z) ( (minor(z) >> 4) )
X
X#define LOW_DSTY 3
X#define MED_DSTY 2
X#define HIGH_DSTY 1
X
X#define SCSI_2_MAX_DENSITY_CODE 0x17 /* maximum density code specified
X in SCSI II spec. */
X/***************************************************************\
X* Define various devices that we know mis-behave in some way, *
X* and note how they are bad, so we can correct for them *
X\***************************************************************/
Xstruct modes
X{
X int quirks; /* same definitions as in rogues */
X char density;
X char spare[3];
X};
Xstruct rogues
X{
X char *name;
X char *manu;
X char *model;
X char *version;
X int quirks; /* valid for all modes */
X struct modes modes[4];
X};
X
X/* define behaviour codes (quirks) */
X#define ST_Q_NEEDS_PAGE_0 0x00001
X#define ST_Q_FORCE_FIXED_MODE 0x00002
X#define ST_Q_FORCE_VAR_MODE 0x00004
X
Xstatic struct rogues gallery[] = /* ends with an all null entry */
X{
X { "Such an old device ", "pre-scsi", " unknown model ","????",
X 0,
X { {ST_Q_FORCE_FIXED_MODE,0}, /* minor 0,1,2,3 */
X {ST_Q_FORCE_FIXED_MODE,QIC_24}, /* minor 4,5,6,7 */
X {ST_Q_FORCE_VAR_MODE,HALFINCH_1600}, /* minor 8,9,10,11*/
X {ST_Q_FORCE_VAR_MODE,HALFINCH_6250} /* minor 12,13,14,15*/
X }
X },
X { "Tandberg tdc3600", "TANDBERG", " TDC 3600 ","????",
X ST_Q_NEEDS_PAGE_0,
X { {0,0}, /* minor 0,1,2,3*/
X {ST_Q_FORCE_VAR_MODE,QIC_525}, /* minor 4,5,6,7*/
X {0,QIC_150}, /* minor 8,9,10,11*/
X {0,QIC_120} /* minor 12,13,14,15*/
X }
X },
X { "Archive Viper 150", "ARCHIVE ", "VIPER 150 21247","????",
X ST_Q_NEEDS_PAGE_0,
X { {0,0}, /* minor 0,1,2,3*/
X {0,QIC_150}, /* minor 4,5,6,7*/
X {0,QIC_120}, /* minor 8,9,10,11*/
X {0,QIC_24} /* minor 12,13,14,15*/
X }
X },
X {(char *)0}
X};
X
X
X#ifndef __386BSD__
Xstruct buf stbuf[NST][STQSIZE]; /* buffer for raw io (one per device) */
Xstruct buf *stbuf_free[NST]; /* queue of free buffers for raw io */
X#endif __386BSD__
Xstruct buf st_buf_queue[NST];
Xint ststrategy();
Xvoid stminphys();
Xstruct scsi_xfer st_scsi_xfer[NST];
Xint st_xfer_block_wait[NST];
X
X#if defined(OSF)
Xcaddr_t st_window[NST];
X#endif /* defined(OSF) */
X#ifndef MACH
X#define ESUCCESS 0
X#endif MACH
X
Xint st_debug = 0;
X
Xint stattach();
Xint st_done();
X
Xstruct st_data
X{
X/*--------------------present operating parameters, flags etc.----------------*/
X int flags; /* see below */
X int blksiz; /* blksiz we are using */
X int density; /* present density */
X int quirks; /* quirks for the open mode */
X int last_dsty; /* last density used */
X/*--------------------device/scsi parameters----------------------------------*/
X struct scsi_switch *sc_sw; /* address of scsi low level switch */
X int ctlr; /* so they know which one we want */
X int targ; /* our scsi target ID */
X int lu; /* our scsi lu */
X/*--------------------parameters reported by the device ----------------------*/
X int blkmin; /* min blk size */
X int blkmax; /* max blk size */
X/*--------------------parameters reported by the device for this media--------*/
X int numblks; /* nominal blocks capacity */
X int media_blksiz; /* 0 if not ST_FIXEDBLOCKS */
X int media_density; /* this is what it said when asked */
X/*--------------------quirks for the whole drive------------------------------*/
X int drive_quirks; /* quirks of this drive */
X/*--------------------How we should set up when openning each minor device----*/
X struct modes modes[4]; /* plus more for each mode */
X/*--------------------storage for sense data returned by the drive------------*/
X unsigned char sense_data[12]; /* additional sense data needed */
X /* for mode sense/select. */
X}st_data[NST];
X#define ST_INITIALIZED 0x01
X#define ST_INFO_VALID 0x02
X#define ST_OPEN 0x04
X#define ST_WRITTEN 0x10
X#define ST_FIXEDBLOCKS 0x20
X#define ST_AT_FILEMARK 0x40
X#define ST_AT_EOM 0x80
X
X#define ST_PER_ACTION (ST_AT_FILEMARK | ST_AT_EOM)
X#define ST_PER_OPEN (ST_OPEN | ST_WRITTEN | ST_PER_ACTION)
X#define ST_PER_MEDIA ST_FIXEDBLOCKS
X
Xstatic int next_st_unit = 0;
X/***********************************************************************\
X* The routine called by the low level scsi routine when it discovers *
X* A device suitable for this driver *
X\***********************************************************************/
X
Xint stattach(ctlr,targ,lu,scsi_switch)
Xstruct scsi_switch *scsi_switch;
X{
X int unit,i;
X struct st_data *st;
X
X if(scsi_debug & PRINTROUTINES) printf("stattach: ");
X /*******************************************************\
X * Check we have the resources for another drive *
X \*******************************************************/
X unit = next_st_unit++;
X if( unit >= NST)
X {
X printf("Too many scsi tapes..(%d > %d) reconfigure kernel",
X (unit + 1),NST);
X return(0);
X }
X st = st_data + unit;
X /*******************************************************\
X * Store information needed to contact our base driver *
X \*******************************************************/
X st->sc_sw = scsi_switch;
X st->ctlr = ctlr;
X st->targ = targ;
X st->lu = lu;
X
X /*******************************************************\
X * Store information about default densities *
X \*******************************************************/
X st->modes[HIGH_DSTY].density = QIC_525;
X st->modes[MED_DSTY].density = QIC_150;
X st->modes[LOW_DSTY].density = QIC_120;
X
X /*******************************************************\
X * Check if the drive is a known criminal and take *
X * Any steps needed to bring it into line *
X \*******************************************************/
X st_identify_drive(unit);
X
X /*******************************************************\
X * Use the subdriver to request information regarding *
X * the drive. We cannot use interrupts yet, so the *
X * request must specify this. *
X \*******************************************************/
X if(st_mode_sense(unit, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT))
X {
X if(st_test_ready(unit,SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT))
X {
X printf("\tst%d: tape present: %d blocks of %d bytes\n",
X unit, st->numblks, st->media_blksiz);
X }
X else
X {
X printf("\tst%d: drive empty\n", unit);
X }
X }
X else
X {
X printf("\tst%d: drive offline\n", unit);
X }
X /*******************************************************\
X * Set up the bufs for this device *
X \*******************************************************/
X#ifndef __386BSD__
X stbuf_free[unit] = (struct buf *)0;
X for (i = 1; i < STQSIZE; i++)
X {
X stbuf[unit][i].b_forw = stbuf_free[unit];
X stbuf_free[unit]=&stbuf[unit][i];
X }
X#endif __386BSD__
X st_buf_queue[unit].b_active = 0;
X st_buf_queue[unit].b_actf = st_buf_queue[unit].b_actl = 0;
X
X#if defined(OSF)
X st_window[unit] = (caddr_t)alloc_kva(SECSIZE*256+PAGESIZ);
X#endif /* defined(OSF) */
X
X st->flags |= ST_INITIALIZED;
X return;
X
X}
X
X/***********************************************************************\
X* Use the identify routine in 'scsiconf' to get drive info so we can *
X* Further tailor our behaviour. *
X\***********************************************************************/
X
Xst_identify_drive(unit)
Xint unit;
X{
X
X struct st_data *st;
X struct scsi_inquiry_data inqbuf;
X struct rogues *finger;
X char manu[32];
X char model[32];
X char version[32];
X
X
X st = st_data + unit;
X /*******************************************************\
X * Get the device type information *
X \*******************************************************/
X if (scsi_inquire(st->ctlr, st->targ, st->lu, st->sc_sw, &inqbuf,
X SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT) != COMPLETE)
X {
X printf(" st%d: couldn't get device type, using default\n", unit);
X return;
X }
X if(inqbuf.ansii_version == 0)
X {
X /***********************************************\
X * If not advanced enough, use default values *
X \***********************************************/
X strncpy(manu,"pre-scsi",8);manu[8]=0;
X strncpy(model," unknown model ",16);model[16]=0;
X strncpy(version,"????",4);version[4]=0;
X }
X else
X {
X strncpy(manu,inqbuf.vendor,8);manu[8]=0;
X strncpy(model,inqbuf.product,16);model[16]=0;
X strncpy(version,inqbuf.revision,4);version[4]=0;
X }
X
X /*******************************************************\
X * Load the parameters for this kind of device, so we *
X * treat it as appropriate for each operating mode *
X \*******************************************************/
X finger = gallery;
X while(finger->name)
X {
X if ((strcmp(manu, finger->manu) == 0 )
X && (strcmp(model, finger->model) == 0 ))
X {
X printf(" st%d: %s is a known rogue\n", unit,finger->name);
X st->modes[0] = finger->modes[0];
X st->modes[1] = finger->modes[1];
X st->modes[2] = finger->modes[2];
X st->modes[3] = finger->modes[3];
X st->drive_quirks= finger->quirks;
X st->quirks = finger->quirks; /*start value*/
X break;
X }
X else
X {
X finger++; /* go to next suspect */
X }
X }
X}
X
X/*******************************************************\
X* open the device. *
X\*******************************************************/
Xstopen(dev)
X{
X int unit,mode,dsty;
X struct st_data *st;
X unit = UNIT(dev);
X mode = MODE(dev);
X dsty = DSTY(dev);
X st = st_data + unit;
X
X /*******************************************************\
X * Check the unit is legal *
X \*******************************************************/
X if ( unit >= NST )
X {
X return(ENXIO);
X }
X /*******************************************************\
X * Only allow one at a time *
X \*******************************************************/
X if(st->flags & ST_OPEN)
X {
X return(ENXIO);
X }
X /*******************************************************\
X * Set up the mode flags according to the minor number *
X * ensure all open flags are in a known state *
X * if it's a different mode, dump all cached parameters *
X \*******************************************************/
X if(st->last_dsty != dsty)
X st->flags &= ~ST_INFO_VALID;
X st->last_dsty = dsty;
X st->flags &= ~ST_PER_OPEN;
X st->quirks = st->drive_quirks | st->modes[dsty].quirks;
X st->density = st->modes[dsty].density;
X
X if(scsi_debug & (PRINTROUTINES | TRACEOPENS))
X printf("stopen: dev=0x%x (unit %d (of %d))\n"
X , dev, unit, NST);
X /*******************************************************\
X * Make sure the device has been initialised *
X \*******************************************************/
X if (!(st->flags & ST_INITIALIZED))
X return(ENXIO);
X
X /*******************************************************\
X * Check that it is still responding and ok. *
X \*******************************************************/
X#ifdef removing_this
X if(scsi_debug & TRACEOPENS)
X printf("device is ");
X if (!(st_req_sense(unit, 0))) /* may get a 'unit attention' if new */
X {
X if(scsi_debug & TRACEOPENS)
X printf("not responding\n");
X return(ENXIO);
X }
X if(scsi_debug & TRACEOPENS)
X printf("ok\n");
X#endif
X if(!(st_test_ready(unit,0)))
X {
X printf("st%d not ready\n",unit);
X return(EIO);
X }
X if(!(st_test_ready(unit,0))) /* first may get 'unit attn' */
X {
X printf("st%d not ready\n",unit);
X return(EIO);
X }
X
X /***************************************************************\
X * If the media is new, then make sure we give it a chance to *
X * to do a 'load' instruction. Possibly the test ready *
X * may not read true until this is done.. check this! XXX *
X \***************************************************************/
X if(!(st->flags & ST_INFO_VALID)) /* is media new? */
X {
X if(!st_load(unit,LD_LOAD,0))
X {
X return(EIO);
X }
X }
X
X /*******************************************************\
X * Load the physical device parameters *
X * loads: blkmin, blkmax *
X \*******************************************************/
X if(!st_rd_blk_lim(unit,0))
X {
X return(EIO);
X }
X
X /*******************************************************\
X * Load the media dependent parameters *
X * includes: media_blksiz,media_density,numblks *
X \*******************************************************/
X if(!st_mode_sense(unit,0))
X {
X return(EIO);
X }
X
X /*******************************************************\
X * From media parameters, device parameters and quirks, *
X * work out how we should be setting outselves up *
X \*******************************************************/
X if(! st_decide_mode(unit))
X return(ENXIO);
X
X if(!st_mode_select(unit,0,st->density))
X {
X return(EIO);
X }
X
X st->flags |= ST_INFO_VALID;
X
X st_prevent(unit,PR_PREVENT,0); /* who cares if it fails? */
X
X if(scsi_debug & TRACEOPENS)
X printf("Params loaded ");
X
X
X st->flags |= ST_OPEN;
X return(0);
X}
X
X/*******************************************************\
X* close the device.. only called if we are the LAST *
X* occurence of an open device *
X\*******************************************************/
Xstclose(dev)
X{
X unsigned char unit,mode;
X struct st_data *st;
X
X unit = UNIT(dev);
X mode = MODE(dev);
X st = st_data + unit;
X
X if(scsi_debug & TRACEOPENS)
X printf("Closing device");
X if(st->flags & ST_WRITTEN)
X {
X st_write_filemarks(unit,1,0);
X }
X st->flags &= ~ST_WRITTEN;
X switch(mode)
X {
X case 0:
X st_rewind(unit,FALSE,SCSI_SILENT);
X st_prevent(unit,PR_ALLOW,SCSI_SILENT);
X break;
X case 1:
X st_prevent(unit,PR_ALLOW,SCSI_SILENT);
X break;
X case 2:
X st_rewind(unit,FALSE,SCSI_SILENT);
X st_prevent(unit,PR_ALLOW,SCSI_SILENT);
X st_load(unit,LD_UNLOAD,SCSI_SILENT);
X break;
X case 3:
X st_prevent(unit,PR_ALLOW,SCSI_SILENT);
X st_load(unit,LD_UNLOAD,SCSI_SILENT);
X break;
X default:
X printf("st%d:close: Bad mode (minor number)%d how's it open?\n"
X ,unit,mode);
X return(EINVAL);
X }
X st->flags &= ~ST_PER_OPEN;
X return(0);
X}
X
X/***************************************************************\
X* Given all we know about the device, media, mode and 'quirks', *
X* make a decision as to how we should be set up. *
X\***************************************************************/
Xst_decide_mode(unit)
Xint unit;
X{
X struct st_data *st = st_data + unit;
X
X if(st->flags & ST_INFO_VALID) return TRUE;
X
X switch(st->quirks & (ST_Q_FORCE_FIXED_MODE | ST_Q_FORCE_VAR_MODE))
X {
X case (ST_Q_FORCE_FIXED_MODE | ST_Q_FORCE_VAR_MODE):
X printf("st%d: bad quirks\n",unit);
X return FALSE;
X case 0:
X switch(st->density)
X {
X case QIC_120:
X case QIC_150:
X goto fixed;
X case HALFINCH_800:
X case HALFINCH_1600:
X case HALFINCH_6250:
X case QIC_525:
X goto var;
X default:
X break;
X }
X if((st->blkmin && (st->blkmin == st->blkmax))
X || (st->media_blksiz))
X goto fixed;
X else
X goto var;
X
X case ST_Q_FORCE_FIXED_MODE:
Xfixed:
X st->flags |= ST_FIXEDBLOCKS;
X if(st->media_blksiz)
X {
X st->blksiz = st->media_blksiz;
X }
X else
X {
X if(st->blkmin)
X {
X st->blksiz = st->blkmin; /* just to make sure */
X }
X else
X {
X st->blksiz = DEF_FIXED_BSIZE;
X }
X }
X break;
X case ST_Q_FORCE_VAR_MODE:
Xvar:
X st->flags &= ~ST_FIXEDBLOCKS;
X st->blksiz = 0;
X break;
X }
X return(TRUE);
X}
X#ifndef __386BSD__
X/*******************************************************\
X* Get ownership of this unit's buf *
X* If need be, sleep on it, until it comes free *
X\*******************************************************/
Xstruct buf *
Xst_get_buf(unit) {
X struct buf *rc;
X
X while (!(rc = stbuf_free[unit]))
X sleep((caddr_t)&stbuf_free[unit], PRIBIO+1);
X stbuf_free[unit] = stbuf_free[unit]->b_forw;
X rc->b_error = 0;
X rc->b_resid = 0;
X rc->b_flags = 0;
X return(rc);
X}
X
X/*******************************************************\
X* Free this unit's buf, wake processes waiting for it *
X\*******************************************************/
Xst_free_buf(unit,bp)
Xstruct buf *bp;
X{
X if (!stbuf_free[unit])
X wakeup((caddr_t)&stbuf_free[unit]);
X bp->b_forw = stbuf_free[unit];
X stbuf_free[unit] = bp;
X}
X
X
X/*******************************************************\
X* Get the buf for this unit and use physio to do it *
X\*******************************************************/
Xstread(dev,uio)
Xregister short dev;
Xstruct uio *uio;
X{
X int unit = UNIT(dev);
X struct buf *bp = st_get_buf(unit);
X int rc;
X rc = physio(ststrategy, bp, dev, B_READ, stminphys, uio);
X st_free_buf(unit,bp);
X return(rc);
X}
X
X/*******************************************************\
X* Get the buf for this unit and use physio to do it *
X\*******************************************************/
Xstwrite(dev,uio)
Xdev_t dev;
Xstruct uio *uio;
X{
X int unit = UNIT(dev);
X struct buf *bp = st_get_buf(unit);
X int rc;
X
X rc = physio(ststrategy, bp, dev, B_WRITE, stminphys, uio);
X st_free_buf(unit,bp);
X return(rc);
X}
X
X
X#endif __386BSD__
X/*******************************************************\
X* trim the size of the transfer if needed, *
X* called by physio *
X* basically the smaller of our min and the scsi driver's*
X* minphys *
X\*******************************************************/
Xvoid stminphys(bp)
Xstruct buf *bp;
X{
X (*(st_data[UNIT(bp->b_dev)].sc_sw->scsi_minphys))(bp);
X}
X
X/*******************************************************\
X* Actually translate the requested transfer into *
X* one the physical driver can understand *
X* The transfer is described by a buf and will include *
X* only one physical transfer. *
X\*******************************************************/
X
Xint ststrategy(bp)
Xstruct buf *bp;
X{
X struct buf *dp;
X unsigned char unit;
X unsigned int opri;
X
X ststrats++;
X unit = UNIT((bp->b_dev));
X if(scsi_debug & PRINTROUTINES) printf("\nststrategy ");
X if(scsi_debug & SHOWREQUESTS) printf("st%d: %d bytes @ blk%d\n",
X unit,bp->b_bcount,bp->b_blkno);
X /*******************************************************\
X * If it's a null transfer, return immediatly *
X \*******************************************************/
X if (bp->b_bcount == 0)
X {
X goto done;
X }
X
X /*******************************************************\
X * Odd sized request on fixed drives are verboten *
X \*******************************************************/
X if(st_data[unit].flags & ST_FIXEDBLOCKS)
X {
X if(bp->b_bcount % st_data[unit].blksiz)
X {
X printf("st%d: bad request, must be multiple of %d\n",
X unit, st_data[unit].blksiz);
X bp->b_error = EIO;
X goto bad;
X }
X }
X /*******************************************************\
X * as are too-short requests on variable length drives. *
X \*******************************************************/
X else if(bp->b_bcount < st_data[unit].blkmin)
X {
X printf("st%d: bad request, must not be less than %d\n",
X unit, st_data[unit].blkmin);
X bp->b_error = EIO;
X goto bad;
X }
X
X#ifdef __386BSD__
X stminphys(bp);
X#endif __386BSD__
X opri = splbio();
X dp = &st_buf_queue[unit];
X
X /*******************************************************\
X * Place it in the queue of disk activities for this tape*
X * at the end *
X \*******************************************************/
X while ( dp->b_actf)
X {
X dp = dp->b_actf;
X }
X dp->b_actf = bp;
X bp->b_actf = NULL;
X
X /*******************************************************\
X * Tell the device to get going on the transfer if it's *
X * not doing anything, otherwise just wait for completion*
X * (All a bit silly if we're only allowing 1 open but..) *
X \*******************************************************/
X ststart(unit);
X
X splx(opri);
X return;
Xbad:
X bp->b_flags |= B_ERROR;
Xdone:
X /*******************************************************\
X * Correctly set the buf to indicate a completed xfer *
X \*******************************************************/
X iodone(bp);
X return;
X}
X
X
X/***************************************************************\
X* ststart looks to see if there is a buf waiting for the device *
X* and that the device is not already busy. If both are true, *
X* It deques the buf and creates a scsi command to perform the *
X* transfer in the buf. The transfer request will call st_done *
X* on completion, which will in turn call this routine again *
X* so that the next queued transfer is performed. *
X* The bufs are queued by the strategy routine (ststrategy) *
X* *
X* This routine is also called after other non-queued requests *
X* have been made of the scsi driver, to ensure that the queue *
X* continues to be drained. *
X\***************************************************************/
X/* ststart() is called at splbio */
Xststart(unit)
X{
X int drivecount;
X register struct buf *bp = 0;
X register struct buf *dp;
X struct scsi_xfer *xs;
X struct scsi_rw_tape cmd;
X int blkno, nblk;
X struct st_data *st;
X
X
X st = st_data + unit;
X
X if(scsi_debug & PRINTROUTINES) printf("ststart%d ",unit);
X /*******************************************************\
X * See if there is a buf to do and we are not already *
X * doing one *
X \*******************************************************/
X xs=&st_scsi_xfer[unit];
X if(xs->flags & INUSE)
X {
X return; /* unit already underway */
X }
Xtrynext:
X if(st_xfer_block_wait[unit]) /* a special awaits, let it proceed first */
X {
X wakeup(&st_xfer_block_wait[unit]);
X return;
X }
X
X dp = &st_buf_queue[unit];
X if ((bp = dp->b_actf) != NULL)
X {
X dp->b_actf = bp->b_actf;
X }
X else /* no work to do */
X {
X return;
X }
X xs->flags = INUSE; /* Now ours */
X
X
X /*******************************************************\
X * We have a buf, now we should move the data into *
X * a scsi_xfer definition and try start it *
X \*******************************************************/
X
X /*******************************************************\
X * If we are at a filemark but have not reported it yet *
X * then we should report it now *
X \*******************************************************/
X if(st->flags & ST_AT_FILEMARK)
X {
X bp->b_error = 0;
X bp->b_flags |= B_ERROR; /* EOF*/
X st->flags &= ~ST_AT_FILEMARK;
X biodone(bp);
X xs->flags = 0; /* won't need it now */
X goto trynext;
X }
X /*******************************************************\
X * If we are at EOM but have not reported it yet *
X * then we should report it now *
X \*******************************************************/
X if(st->flags & ST_AT_EOM)
X {
X bp->b_error = EIO;
X bp->b_flags |= B_ERROR;
X st->flags &= ~ST_AT_EOM;
X biodone(bp);
X xs->flags = 0; /* won't need it now */
X goto trynext;
X }
X /*******************************************************\
X * Fill out the scsi command *
X \*******************************************************/
X bzero(&cmd, sizeof(cmd));
X if((bp->b_flags & B_READ) == B_WRITE)
X {
X st->flags |= ST_WRITTEN;
X xs->flags |= SCSI_DATA_OUT;
X }
X else
X {
X xs->flags |= SCSI_DATA_IN;
X }
X cmd.op_code = (bp->b_flags & B_READ)
X ? READ_COMMAND_TAPE
X : WRITE_COMMAND_TAPE;
X
X /*******************************************************\
X * Handle "fixed-block-mode" tape drives by using the *
X * block count instead of the length. *
X \*******************************************************/
X if(st->flags & ST_FIXEDBLOCKS)
X {
X cmd.fixed = 1;
X lto3b(bp->b_bcount/st->blksiz,cmd.len);
X }
X else
X {
X lto3b(bp->b_bcount,cmd.len);
X }
X
X /*******************************************************\
X * Fill out the scsi_xfer structure *
X * Note: we cannot sleep as we may be an interrupt *
X \*******************************************************/
X xs->flags |= SCSI_NOSLEEP;
X xs->adapter = st->ctlr;
X xs->targ = st->targ;
X xs->lu = st->lu;
X xs->retries = 1; /* can't retry on tape*/
X xs->timeout = 100000; /* allow 100 secs for retension */
X xs->cmd = (struct scsi_generic *)&cmd;
X xs->cmdlen = sizeof(cmd);
X xs->data = (u_char *)bp->b_un.b_addr;
X xs->datalen = bp->b_bcount;
X xs->resid = bp->b_bcount;
X xs->when_done = st_done;
X xs->done_arg = unit;
X xs->done_arg2 = (int)xs;
X xs->error = XS_NOERROR;
X xs->bp = bp;
X /*******************************************************\
X * Pass all this info to the scsi driver. *
X \*******************************************************/
X
X
X#if defined(OSF)||defined(FIX_ME)
X if (bp->b_flags & B_PHYS) {
X xs->data = (u_char*)map_pva_kva(bp->b_proc, bp->b_un.b_addr,
X bp->b_bcount, st_window[unit],
X (bp->b_flags&B_READ)?B_WRITE:B_READ);
X } else {
X xs->data = (u_char*)bp->b_un.b_addr;
X }
X#endif /* defined(OSF) */
X
X if ( (*(st->sc_sw->scsi_cmd))(xs) != SUCCESSFULLY_QUEUED)
X {
X printf("st%d: oops not queued",unit);
X xs->error = XS_DRIVER_STUFFUP;
X st_done(unit,xs);
X }
X stqueues++;
X}
X
X/*******************************************************\
X* This routine is called by the scsi interrupt when *
X* the transfer is complete.
X\*******************************************************/
Xint st_done(unit,xs)
Xint unit;
Xstruct scsi_xfer *xs;
X{
X struct buf *bp;
X int retval;
X
X if(scsi_debug & PRINTROUTINES) printf("st_done%d ",unit);
X if (! (xs->flags & INUSE))
X panic("scsi_xfer not in use!");
X if(bp = xs->bp)
X {
X switch(xs->error)
X {
X case XS_NOERROR:
X bp->b_flags &= ~B_ERROR;
X bp->b_error = 0;
X bp->b_resid = 0;
X break;
X case XS_SENSE:
X retval = (st_interpret_sense(unit,xs));
X if(retval)
X {
X /***************************************\
X * We have a real error, the bit should *
X * be set to indicate this. The return *
X * value will contain the unix error code*
X * that the error interpretation routine *
X * thought was suitable, so pass this *
X * value back in the buf structure. *
X * Furthermore we return information *
X * saying that no data was transferred *
X \***************************************/
X bp->b_flags |= B_ERROR;
X bp->b_error = retval;
X bp->b_resid = bp->b_bcount;
X st_data[unit].flags
X &= ~(ST_AT_FILEMARK|ST_AT_EOM);
X }
X else
X {
X /***********************************************\
X * The error interpretation code has declared *
X * that it wasn't a real error, or at least that *
X * we should be ignoring it if it was. *
X \***********************************************/
X if(xs->resid && ( xs->resid != xs->datalen ))
X {
X /***************************************\
X * Here we have the tricky part.. *
X * We successfully read less data than *
X * we requested. (but not 0) *
X *------for variable blocksize tapes:----*
X * UNDER 386BSD: *
X * We should legitimatly have the error *
X * bit set, with the error value set to *
X * zero.. This is to indicate to the *
X * physio code that while we didn't get *
X * as much information as was requested, *
X * we did reach the end of the record *
X * and so physio should not call us *
X * again for more data... we have it all *
X * SO SET THE ERROR BIT! *
X * *
X * UNDER MACH:(CMU) *
X * To indicate the same as above, we *
X * need only have a non 0 resid that is *
X * less than the b_bcount, but the *
X * ERROR BIT MUST BE CLEAR! (sigh) *
X * *
X * UNDER OSF1: *
X * To indicate the same as above, we *
X * need to have a non 0 resid that is *
X * less than the b_bcount, but the *
X * ERROR BIT MUST BE SET! (gasp)(sigh) *
X * *
X *-------for fixed blocksize device------*
X * We could have read some successful *
X * records before hitting *
X * the EOF or EOT. These must be passed *
X * to the user, before we report the *
X * EOx. Only if there is no data for the *
X * user do we report it now. (via an EIO *
X * for EOM and resid == count for EOF). *
X * We will report the EOx NEXT time.. *
X \***************************************/
X#ifdef MACH /*osf and cmu varieties */
X#ifdef OSF
X bp->b_flags |= B_ERROR;
X#else OSF
X bp->b_flags &= ~B_ERROR;
X#endif OSF
X#endif MACH
X#ifdef __386BSD__
X bp->b_flags |= B_ERROR;
X#endif __386BSD__
X bp->b_error = 0;
X bp->b_resid = xs->resid;
X if((st_data[unit].flags & ST_FIXEDBLOCKS))
X {
X bp->b_resid *= st_data[unit].blksiz;
X if( (st_data[unit].flags & ST_AT_EOM)
X && (bp->b_resid == bp->b_bcount))
X {
X bp->b_error = EIO;
X st_data[unit].flags
X &= ~ST_AT_EOM;
X }
X }
X xs->error = XS_NOERROR;
X break;
X }
X else
X {
X /***************************************\
X * We have come out of the error handler *
X * with no error code.. we have also *
X * not had an ili (would have gone to *
X * the previous clause). Now we need to *
X * distiguish between succesful read of *
X * no data (EOF or EOM) and successfull *
X * read of all requested data. *
X * At least all o/s agree that: *
X * 0 bytes read with no error is EOF *
X * 0 bytes read with an EIO is EOM *
X \***************************************/
X
X bp->b_resid = bp->b_bcount;
X if(st_data[unit].flags & ST_AT_FILEMARK)
X {
X st_data[unit].flags &= ~ST_AT_FILEMARK;
X bp->b_flags &= ~B_ERROR;
X bp->b_error = 0;
X break;
X }
X if(st_data[unit].flags & ST_AT_EOM)
X {
X bp->b_flags |= B_ERROR;
X bp->b_error = EIO;
X st_data[unit].flags &= ~ST_AT_EOM;
X break;
X }
X printf("st%d:error ignored\n" ,unit);
X }
X }
X break;
X
X case XS_TIMEOUT:
X printf("st%d timeout\n",unit);
X break;
X
X case XS_BUSY: /* should retry */ /* how? */
X /************************************************/
X /* SHOULD put buf back at head of queue */
X /* and decrement retry count in (*xs) */
X /* HOWEVER, this should work as a kludge */
X /************************************************/
X if(xs->retries--)
X {
X xs->flags &= ~ITSDONE;
X xs->error = XS_NOERROR;
X if ( (*(st_data[unit].sc_sw->scsi_cmd))(xs)
X == SUCCESSFULLY_QUEUED)
X { /* don't wake the job, ok? */
X return;
X }
X printf("device busy");
X xs->flags |= ITSDONE;
X }
X
X case XS_DRIVER_STUFFUP:
X bp->b_flags |= B_ERROR;
X bp->b_error = EIO;
X break;
X default:
X printf("st%d: unknown error category from scsi driver\n"
X ,unit);
X }
X biodone(bp);
X xs->flags = 0; /* no longer in use */
X ststart(unit); /* If there's another waiting.. do it */
X }
X else
X {
X wakeup(xs);
X }
X}
X/*******************************************************\
X* Perform special action on behalf of the user *
X* Knows about the internals of this device *
X\*******************************************************/
Xstioctl(dev, cmd, arg, mode)
Xdev_t dev;
Xint cmd;
Xcaddr_t arg;
X{
X register i,j;
X unsigned int opri;
X int errcode = 0;
X unsigned char unit;
X int number,flags,ret;
X struct st_data *st;
X
X /*******************************************************\
X * Find the device that the user is talking about *
X \*******************************************************/
X flags = 0; /* give error messages, act on errors etc. */
X unit = UNIT(dev);
X st = st_data + unit;
X
X switch(cmd)
X {
X
X case MTIOCGET:
X {
X struct mtget *g = (struct mtget *) arg;
X
X bzero(g, sizeof(struct mtget));
X g->mt_type = 0x7; /* Ultrix compat */ /*?*/
X if (st->flags & ST_FIXEDBLOCKS) {
X g->mt_bsiz = st->blksiz;
X } else {
X g->mt_bsiz = 0;
X }
X g->mt_dns_high = st->modes[HIGH_DSTY].density;
X g->mt_dns_medium = st->modes[MED_DSTY].density;
X g->mt_dns_low = st->modes[LOW_DSTY].density;
X ret=TRUE;
X break;
X }
X
X
X case MTIOCTOP:
X {
X struct mtop *mt = (struct mtop *) arg;
X
X if (st_debug)
X printf("[sctape_sstatus: %x %x]\n",
X mt->mt_op, mt->mt_count);
X
X
X
X /* compat: in U*x it is a short */
X number = mt->mt_count;
X switch ((short)(mt->mt_op))
X {
X case MTWEOF: /* write an end-of-file record */
X ret = st_write_filemarks(unit,number,flags);
X st_data[unit].flags &= ~ST_WRITTEN;
X break;
X case MTFSF: /* forward space file */
X ret = st_space(unit,number,SP_FILEMARKS,flags);
X break;
X case MTBSF: /* backward space file */
X ret = st_space(unit,-number,SP_FILEMARKS,flags);
X break;
X case MTFSR: /* forward space record */
X ret = st_space(unit,number,SP_BLKS,flags);
X break;
X case MTBSR: /* backward space record */
X ret = st_space(unit,-number,SP_BLKS,flags);
X break;
X case MTREW: /* rewind */
X ret = st_rewind(unit,FALSE,flags);
X break;
X case MTOFFL: /* rewind and put the drive offline */
X if((ret = st_rewind(unit,FALSE,flags)))
X {
X st_prevent(unit,PR_ALLOW,0);
X ret = st_load(unit,LD_UNLOAD,flags);
X }
X else
X {
X printf("rewind failed, unit still loaded\n");
X }
X break;
X case MTNOP: /* no operation, sets status only */
X case MTCACHE: /* enable controller cache */
X case MTNOCACHE: /* disable controller cache */
X ret = TRUE;;
X break;
X case MTSETBSIZ: /* Set block size for device */
X if (st->blkmin == st->blkmax)
X {
X /* This doesn't make sense for a */
X /* real fixed block device */
X ret = FALSE;
X }
X else
X {
X if ( number == 0 )
X {
X /* Restoring original block size */
X st->flags &= ~ST_FIXEDBLOCKS; /*XXX*/
X st->blksiz = st->media_blksiz;
X }
X else
X {
X if (number < st->blkmin || number > st->blkmax)
X { ret = FALSE;
X ret = FALSE;
X }
X else
X {
X st->blksiz = number;
X st->flags |= ST_FIXEDBLOCKS;
X ret = TRUE;
X }
X }
X }
X break;
X
X /* How do we check that the drive can handle
X the requested density ? */
X
X case MTSETHDNSTY: /* Set high density defaults for device */
X if (number < 0 || number > SCSI_2_MAX_DENSITY_CODE)
X {
X ret = EINVAL;
X }
X else
X {
X st->modes[HIGH_DSTY].density = number;
X ret = TRUE;
X }
X break;
X
X case MTSETMDNSTY: /* Set medium density defaults for device */
X if (number < 0 || number > SCSI_2_MAX_DENSITY_CODE)
X {
X ret = EINVAL;
X }
X else
X {
X st->modes[MED_DSTY].density = number;
X ret = TRUE;
X }
X break;
X
X case MTSETLDNSTY: /* Set low density defaults for device */
X if (number < 0 || number > SCSI_2_MAX_DENSITY_CODE)
X {
X ret = FALSE;
X }
X else
X {
X st->modes[LOW_DSTY].density = number;
X ret = TRUE;
X }
X break;
X
X default:
X return EINVAL;
X }
X break;
X }
X case MTIOCIEOT:
X case MTIOCEEOT:
X ret=TRUE;
X break;
X }
X
X return(ret?ESUCCESS:EIO);
X}
X
X
X#ifdef removing_this
X/*******************************************************\
X* Check with the device that it is ok, (via scsi driver)*
X\*******************************************************/
Xst_req_sense(unit, flags)
Xint flags;
X{
X struct scsi_sense_data sense;
X struct scsi_sense scsi_cmd;
X
X bzero(&scsi_cmd, sizeof(scsi_cmd));
X scsi_cmd.op_code = REQUEST_SENSE;
X scsi_cmd.length = sizeof(sense);
X
X if (st_scsi_cmd(unit,
X &scsi_cmd,
X sizeof(scsi_cmd),
X &sense,
X sizeof(sense),
X 100000,
X flags | SCSI_DATA_IN) != 0)
X {
X return(FALSE);
X }
X return(TRUE);
X}
X
X#endif
X/*******************************************************\
X* Get scsi driver to send a "are you ready" command *
X\*******************************************************/
Xst_test_ready(unit,flags)
Xint unit,flags;
X{
X struct scsi_test_unit_ready scsi_cmd;
X
X bzero(&scsi_cmd, sizeof(scsi_cmd));
X scsi_cmd.op_code = TEST_UNIT_READY;
X
X if (st_scsi_cmd(unit,
X &scsi_cmd,
X sizeof(scsi_cmd),
X 0,
X 0,
X 100000,
X flags) != 0)
X {
X return(FALSE);
X }
X return(TRUE);
X}
X
X
X#ifdef __STDC__
X#define b2tol(a) (((unsigned)(a##_1) << 8) + (unsigned)a##_0 )
X#else
X#define b2tol(a) (((unsigned)(a/**/_1) << 8) + (unsigned)a/**/_0 )
X#endif
X
X/*******************************************************\
X* Ask the drive what it's min and max blk sizes are. *
X\*******************************************************/
Xst_rd_blk_lim(unit, flags)
Xint unit,flags;
X{
X struct scsi_blk_limits scsi_cmd;
X struct scsi_blk_limits_data scsi_blkl;
X struct st_data *st = st_data + unit;
X /*******************************************************\
X * First check if we have it all loaded *
X \*******************************************************/
X if ((st->flags & ST_INFO_VALID)) return TRUE;
X
X /*******************************************************\
X * do a 'Read Block Limits' *
X \*******************************************************/
X bzero(&scsi_cmd, sizeof(scsi_cmd));
X scsi_cmd.op_code = READ_BLK_LIMITS;
X
X /*******************************************************\
X * do the command, update the global values *
X \*******************************************************/
X if (st_scsi_cmd(unit,
X &scsi_cmd,
X sizeof(scsi_cmd),
X &scsi_blkl,
X sizeof(scsi_blkl),
X 5000,
X flags | SCSI_DATA_IN) != 0)
X {
X if(!(flags & SCSI_SILENT))
X printf("could not get blk limits for unit %d\n", unit);
X st->flags &= ~ST_INFO_VALID;
X return(FALSE);
X }
X st->blkmin = b2tol(scsi_blkl.min_length);
X st->blkmax = _3btol(&scsi_blkl.max_length_2);
X
X if (st_debug)
X {
X printf(" (%d <= blksiz <= %d\n) ",st->blkmin,st->blkmax);
X }
X}
X
X/*******************************************************\
X* Get the scsi driver to send a full inquiry to the *
X* device and use the results to fill out the global *
X* parameter structure. *
X* *
X* called from: *
X* attach *
X* open *
X* ioctl (to reset original blksize) *
X\*******************************************************/
Xst_mode_sense(unit, flags)
Xint unit,flags;
X{
X int scsi_sense_len;
X char *scsi_sense_ptr;
X struct scsi_mode_sense scsi_cmd;
X struct scsi_sense
X {
X struct scsi_mode_header_tape header;
X struct blk_desc blk_desc;
X }scsi_sense;
X
X struct scsi_sense_page_0
X {
X struct scsi_mode_header_tape header;
X struct blk_desc blk_desc;
X unsigned char sense_data[PAGE_0_SENSE_DATA_SIZE];
X /* Tandberg tape drives returns page 00 */
X /* with the sense data, whether or not */
X /* you want it( ie the don't like you */
X /* saying you want anything less!!!!! */
X /* They also expect page 00 */
X /* back when you issue a mode select */
X }scsi_sense_page_0;
X struct st_data *st = st_data + unit;
X
X /*******************************************************\
X * First check if we have it all loaded *
X \*******************************************************/
X if ((st->flags & ST_INFO_VALID)) return(TRUE);
X
X /*******************************************************\
X * Define what sort of structure we're working with *
X \*******************************************************/
X if (st->quirks & ST_Q_NEEDS_PAGE_0)
X {
X scsi_sense_len = sizeof(scsi_sense_page_0);
X scsi_sense_ptr = (char *) &scsi_sense_page_0;
X }
X else
X {
X scsi_sense_len = sizeof(scsi_sense);
X scsi_sense_ptr = (char *) &scsi_sense;
X }
X
X /*******************************************************\
X * Set up a mode sense *
X \*******************************************************/
X bzero(&scsi_cmd, sizeof(scsi_cmd));
X scsi_cmd.op_code = MODE_SENSE;
X scsi_cmd.length = scsi_sense_len;
X
X /*******************************************************\
X * do the command, but we don't need the results *
X * just print them for our interest's sake, if asked, *
X * or if we need it as a template for the mode select *
X * store it away. *
X \*******************************************************/
X if (st_scsi_cmd(unit,
X &scsi_cmd,
X sizeof(scsi_cmd),
X scsi_sense_ptr,
X scsi_sense_len,
X 5000,
X flags | SCSI_DATA_IN) != 0)
X {
X if(!(flags & SCSI_SILENT))
X printf("could not mode sense for unit %d\n", unit);
X st->flags &= ~ST_INFO_VALID;
X return(FALSE);
X }
X st->numblks = _3btol(&(((struct scsi_sense *)scsi_sense_ptr)->blk_desc.nblocks));
X st->media_blksiz = _3btol(&(((struct scsi_sense *)scsi_sense_ptr)->blk_desc.blklen));
X st->media_density = ((struct scsi_sense *)scsi_sense_ptr)->blk_desc.density;
X if (st_debug)
X {
X printf("unit %d: %d blocks of %d bytes, write %s, %sbuffered",
X unit,
X st->numblks,
X st->media_blksiz,
X (((struct scsi_sense *)scsi_sense_ptr)->header.write_protected ?
X "protected" : "enabled"),
X (((struct scsi_sense *)scsi_sense_ptr)->header.buf_mode ?
X "" : "un")
X );
X }
X if (st->quirks & ST_Q_NEEDS_PAGE_0)
X {
X bcopy(((struct scsi_sense_page_0 *)scsi_sense_ptr)->sense_data,
X st->sense_data,
X sizeof(((struct scsi_sense_page_0 *)scsi_sense_ptr)->sense_data));
X }
X return(TRUE);
X}
X
X/*******************************************************\
X* Send a filled out parameter structure to the drive to *
X* set it into the desire modes etc. *
X\*******************************************************/
Xst_mode_select(unit, flags, dsty_code)
Xint unit,flags,dsty_code;
X{
X int dat_len;
X char *dat_ptr;
X struct scsi_mode_select scsi_cmd;
X struct dat
X {
X struct scsi_mode_header_tape header;
X struct blk_desc blk_desc;
X }dat;
X struct dat_page_0
X {
X struct scsi_mode_header_tape header;
X struct blk_desc blk_desc;
X unsigned char sense_data[PAGE_0_SENSE_DATA_SIZE];
X }dat_page_0;
X struct st_data *st = st_data + unit;
X
X /*******************************************************\
X * Define what sort of structure we're working with *
X \*******************************************************/
X if (st->quirks & ST_Q_NEEDS_PAGE_0)
X {
X dat_len = sizeof(dat_page_0);
X dat_ptr = (char *) &dat_page_0;
X }
X else
X {
X dat_len = sizeof(dat);
X dat_ptr = (char *) &dat;
X }
X
X /*******************************************************\
X * Set up for a mode select *
X \*******************************************************/
X bzero(dat_ptr, dat_len);
X bzero(&scsi_cmd, sizeof(scsi_cmd));
X scsi_cmd.op_code = MODE_SELECT;
X scsi_cmd.length = dat_len;
X ((struct dat *)dat_ptr)->header.blk_desc_len = sizeof(struct blk_desc);
X ((struct dat *)dat_ptr)->header.buf_mode = 1;
X ((struct dat *)dat_ptr)->blk_desc.density = dsty_code;
X if(st->flags & ST_FIXEDBLOCKS)
X {
X lto3b( st->blksiz , ((struct dat *)dat_ptr)->blk_desc.blklen);
X }
X if (st->quirks & ST_Q_NEEDS_PAGE_0)
X {
X bcopy(st->sense_data, ((struct dat_page_0 *)dat_ptr)->sense_data,
X sizeof(((struct dat_page_0 *)dat_ptr)->sense_data));
X /* the Tandberg tapes need the block size to */
X /* be set on each mode sense/select. */
X }
X /*******************************************************\
X * do the command *
X \*******************************************************/
X if (st_scsi_cmd(unit,
X &scsi_cmd,
X sizeof(scsi_cmd),
X dat_ptr,
X dat_len,
X 5000,
X flags | SCSI_DATA_OUT) != 0)
X {
X if(!(flags & SCSI_SILENT))
X printf("could not mode select for unit %d\n", unit);
X st->flags &= ~ST_INFO_VALID;
X return(FALSE);
X }
X return(TRUE);
X}
X
X/*******************************************************\
X* skip N blocks/filemarks/seq filemarks/eom *
X\*******************************************************/
Xst_space(unit,number,what,flags)
Xint unit,number,what,flags;
X{
X struct scsi_space scsi_cmd;
X
X /* if we are at a filemark now, we soon won't be*/
X st_data[unit].flags &= ~(ST_AT_FILEMARK | ST_AT_EOM);
X bzero(&scsi_cmd, sizeof(scsi_cmd));
X scsi_cmd.op_code = SPACE;
X scsi_cmd.code = what;
X lto3b(number,scsi_cmd.number);
X if (st_scsi_cmd(unit,
X &scsi_cmd,
X sizeof(scsi_cmd),
X 0,
X 0,
X 600000, /* 10 mins enough? */
X flags) != 0)
X {
X if(!(flags & SCSI_SILENT))
X printf("could not space st%d\n", unit);
X st_data[unit].flags &= ~ST_INFO_VALID;
X return(FALSE);
X }
X return(TRUE);
X}
X/*******************************************************\
X* write N filemarks *
X\*******************************************************/
Xst_write_filemarks(unit,number,flags)
Xint unit,number,flags;
X{
X struct scsi_write_filemarks scsi_cmd;
X
X st_data[unit].flags &= ~(ST_AT_FILEMARK);
X bzero(&scsi_cmd, sizeof(scsi_cmd));
X scsi_cmd.op_code = WRITE_FILEMARKS;
X lto3b(number,scsi_cmd.number);
X if (st_scsi_cmd(unit,
X &scsi_cmd,
X sizeof(scsi_cmd),
X 0,
X 0,
X 100000, /* 10 secs.. (may need to repos head )*/
X flags) != 0)
X {
X if(!(flags & SCSI_SILENT))
X printf("could not write_filemarks st%d\n", unit);
X st_data[unit].flags &= ~ST_INFO_VALID;
X return(FALSE);
X }
X return(TRUE);
X}
X/*******************************************************\
X* load /unload (with retension if true) *
X\*******************************************************/
Xst_load(unit,type,flags)
Xint unit,type,flags;
X{
X struct scsi_load scsi_cmd;
X
X st_data[unit].flags &= ~(ST_AT_FILEMARK | ST_AT_EOM);
X bzero(&scsi_cmd, sizeof(scsi_cmd));
X scsi_cmd.op_code = LOAD_UNLOAD;
X scsi_cmd.load=type;
X if (type == LD_LOAD)
X {
X /*scsi_cmd.reten=TRUE;*/
X scsi_cmd.reten=FALSE;
X }
X else
X {
X scsi_cmd.reten=FALSE;
X }
X if (st_scsi_cmd(unit,
X &scsi_cmd,
X sizeof(scsi_cmd),
X 0,
X 0,
X 30000, /* 30 secs */
X flags) != 0)
X {
X if(!(flags & SCSI_SILENT))
X printf("cannot load/unload st%d\n", unit);
X return(FALSE);
X st_data[unit].flags &= ~ST_INFO_VALID;
X }
X return(TRUE);
X}
X/*******************************************************\
X* Prevent or allow the user to remove the tape *
X\*******************************************************/
Xst_prevent(unit,type,flags)
Xint unit,type,flags;
X{
X struct scsi_prevent scsi_cmd;
X
X bzero(&scsi_cmd, sizeof(scsi_cmd));
X scsi_cmd.op_code = PREVENT_ALLOW;
X scsi_cmd.prevent=type;
X if (st_scsi_cmd(unit,
X &scsi_cmd,
X sizeof(scsi_cmd),
X 0,
X 0,
X 5000,
X flags) != 0)
X {
X if(!(flags & SCSI_SILENT))
X printf("cannot prevent/allow on st%d\n", unit);
X st_data[unit].flags &= ~ST_INFO_VALID;
X return(FALSE);
X }
X return(TRUE);
X}
X/*******************************************************\
X* Rewind the device *
X\*******************************************************/
Xst_rewind(unit,immed,flags)
Xint unit,immed,flags;
X{
X struct scsi_rewind scsi_cmd;
X
X st_data[unit].flags &= ~(ST_AT_FILEMARK | ST_AT_EOM);
X bzero(&scsi_cmd, sizeof(scsi_cmd));
X scsi_cmd.op_code = REWIND;
X scsi_cmd.immed=immed;
X if (st_scsi_cmd(unit,
X &scsi_cmd,
X sizeof(scsi_cmd),
X 0,
X 0,
X immed?5000:300000, /* 5 sec or 5 min */
X flags) != 0)
X {
X if(!(flags & SCSI_SILENT))
X printf("could not rewind st%d\n", unit);
X st_data[unit].flags &= ~ST_INFO_VALID;
X return(FALSE);
X }
X return(TRUE);
X}
X/*******************************************************\
X* ask the scsi driver to perform a command for us. *
X* Call it through the switch table, and tell it which *
X* sub-unit we want, and what target and lu we wish to *
X* talk to. Also tell it where to find the command *
X* how long int is. *
X* Also tell it where to read/write the data, and how *
X* long the data is supposed to be *
X\*******************************************************/
Xint st_scsi_cmd(unit,scsi_cmd,cmdlen,data_addr,datalen,timeout,flags)
X
Xint unit,flags;
Xstruct scsi_generic *scsi_cmd;
Xint cmdlen;
Xint timeout;
Xu_char *data_addr;
Xint datalen;
X{
X struct scsi_xfer *xs;
X int retval;
X int s;
X struct st_data *st = st_data + unit;
X
X if(scsi_debug & PRINTROUTINES) printf("\nst_scsi_cmd%d ",unit);
X if(st->sc_sw) /* If we have a scsi driver */
X {
X
X xs = &(st_scsi_xfer[unit]);
X if(!(flags & SCSI_NOMASK))
X s = splbio();
X st_xfer_block_wait[unit]++; /* there is someone waiting */
X while (xs->flags & INUSE)
X {
X sleep(&st_xfer_block_wait[unit],PRIBIO+1);
X }
X st_xfer_block_wait[unit]--;
X xs->flags = INUSE;
X if(!(flags & SCSI_NOMASK))
X splx(s);
X
X /*******************************************************\
X * Fill out the scsi_xfer structure *
X \*******************************************************/
X xs->flags |= flags;
X xs->adapter = st->ctlr;
X xs->targ = st->targ;
X xs->lu = st->lu;
X xs->retries = ST_RETRIES;
X xs->timeout = timeout;
X xs->cmd = scsi_cmd;
X xs->cmdlen = cmdlen;
X xs->data = data_addr;
X xs->datalen = datalen;
X xs->resid = datalen;
X xs->when_done = (flags & SCSI_NOMASK)
X ?(int (*)())0
X :st_done;
X xs->done_arg = unit;
X xs->done_arg2 = (int)xs;
Xretry: xs->error = XS_NOERROR;
X xs->bp = 0;
X retval = (*(st->sc_sw->scsi_cmd))(xs);
X switch(retval)
X {
X case SUCCESSFULLY_QUEUED:
X s = splbio();
X while(!(xs->flags & ITSDONE))
X sleep(xs,PRIBIO+1);
X splx(s);
X
X case HAD_ERROR:
X case COMPLETE:
X switch(xs->error)
X {
X case XS_NOERROR:
X retval = ESUCCESS;
X break;
X case XS_SENSE:
X retval = (st_interpret_sense(unit,xs));
X /* only useful for reads */
X if (retval)
X { /* error... don't care about filemarks */
X st->flags &= ~(ST_AT_FILEMARK
X | ST_AT_EOM);
X }
X else
X {
X xs->error = XS_NOERROR;
X retval = ESUCCESS;
X }
X break;
X case XS_DRIVER_STUFFUP:
X retval = EIO;
X break;
X case XS_TIMEOUT:
X if(xs->retries-- )
X {
X xs->flags &= ~ITSDONE;
X goto retry;
X }
X retval = EIO;
X break;
X case XS_BUSY:
X if(xs->retries-- )
X {
X xs->flags &= ~ITSDONE;
X goto retry;
X }
X retval = EIO;
X break;
X default:
X retval = EIO;
X printf("st%d: unknown error category from scsi driver\n"
X ,unit);
X break;
X }
X break;
X case TRY_AGAIN_LATER:
X if(xs->retries-- )
X {
X xs->flags &= ~ITSDONE;
X goto retry;
X }
X retval = EIO;
X break;
X default:
X retval = EIO;
X }
X xs->flags = 0; /* it's free! */
X ststart(unit);
X }
X else
X {
X printf("st%d: not set up\n",unit);
X return(EINVAL);
X }
X return(retval);
X}
X/***************************************************************\
X* Look at the returned sense and act on the error and detirmine *
X* The unix error number to pass back... (0 = report no error) *
X\***************************************************************/
X
Xint st_interpret_sense(unit,xs)
Xint unit;
Xstruct scsi_xfer *xs;
X{
X struct scsi_sense_data *sense;
X int key;
X int silent = xs->flags & SCSI_SILENT;
X
X /***************************************************************\
X * If errors are ok, report a success *
X \***************************************************************/
X if(xs->flags & SCSI_ERR_OK) return(ESUCCESS);
X
X /***************************************************************\
X * Get the sense fields and work out what CLASS *
X \***************************************************************/
X sense = &(xs->sense);
X if(st_debug)
X {
X int count = 0;
X printf("code%x class%x valid%x\n"
X ,sense->error_code
X ,sense->error_class
X ,sense->valid);
X printf("seg%x key%x ili%x eom%x fmark%x\n"
X ,sense->ext.extended.segment
X ,sense->ext.extended.sense_key
X ,sense->ext.extended.ili
X ,sense->ext.extended.eom
X ,sense->ext.extended.filemark);
X printf("info: %x %x %x %x followed by %d extra bytes\n"
X ,sense->ext.extended.info[0]
X ,sense->ext.extended.info[1]
X ,sense->ext.extended.info[2]
X ,sense->ext.extended.info[3]
X ,sense->ext.extended.extra_len);
X printf("extra: ");
X while(count < sense->ext.extended.extra_len)
X {
X printf ("%x ",sense->ext.extended.extra_bytes[count++]);
X }
X printf("\n");
X }
X switch(sense->error_class)
X {
X /***************************************************************\
X * If it's class 7, use the extended stuff and interpret the key *
X \***************************************************************/
X case 7:
X {
X if(sense->ext.extended.eom)
X {
X st_data[unit].flags |= ST_AT_EOM;
X }
X
X if(sense->ext.extended.filemark)
X {
X st_data[unit].flags |= ST_AT_FILEMARK;
X }
X
X if(sense->ext.extended.ili)
X {
X if(sense->valid)
X {
X /*******************************\
X * In all ili cases, note that *
X * the resid is non-0 AND not *
X * unchanged. *
X \*******************************/
X xs->resid
X = ntohl(*((long *)sense->ext.extended.info));
X if(xs->bp)
X {
X if(xs->resid < 0)
X { /* never on block devices */
X /***********************\
X * it's only really bad *
X * if we have lost data *
X * (the record was *
X * bigger than the read) *
X \***********************/
X return(EIO);
X }
X }
X }
X else
X { /* makes no sense.. complain */
X printf("BAD length error?");
X }
X }/* there may be some other error. check the rest */
X
X key=sense->ext.extended.sense_key;
X switch(key)
X {
X case 0x0:
X xs->resid = 0; /* XXX check this */
X return(ESUCCESS);
X case 0x1:
X if(!silent)
X {
X printf("st%d: soft error(corrected) ", unit);
X if(sense->valid)
X {
X printf("block no. %d (decimal)\n",
X (sense->ext.extended.info[0] <<24)|
X (sense->ext.extended.info[1] <<16)|
X (sense->ext.extended.info[2] <<8)|
X (sense->ext.extended.info[3] ));
X }
X else
X {
X printf("\n");
X }
X }
X xs->resid = 0; /* XXX check this */
X return(ESUCCESS);
X case 0x2:
X if(!silent) printf("st%d: not ready\n ", unit);
X return(ENODEV);
X case 0x3:
X if(!silent)
X {
X printf("st%d: medium error ", unit);
X if(sense->valid)
X {
X printf("block no. %d (decimal)\n",
X (sense->ext.extended.info[0] <<24)|
X (sense->ext.extended.info[1] <<16)|
X (sense->ext.extended.info[2] <<8)|
X (sense->ext.extended.info[3] ));
X }
X else
X {
X printf("\n");
X }
X }
X return(EIO);
X case 0x4:
X if(!silent) printf("st%d: non-media hardware failure\n ",
X unit);
X return(EIO);
X case 0x5:
X if(!silent) printf("st%d: illegal request\n ", unit);
X return(EINVAL);
X case 0x6:
X if(!silent) printf("st%d: Unit attention.\n ", unit);
X st_data[unit].flags &= ~(ST_AT_FILEMARK|ST_AT_EOM);
X st_data[unit].flags &= ~ST_INFO_VALID;
X if (st_data[unit].flags & ST_OPEN) /* TEMP!!!! */
X return(EIO);
X else
X return(ESUCCESS);
X case 0x7:
X if(!silent)
X {
X printf("st%d: attempted protection violation "
X , unit);
X if(sense->valid)
X {
X printf("block no. %d (decimal)\n",
X (sense->ext.extended.info[0] <<24)|
X (sense->ext.extended.info[1] <<16)|
X (sense->ext.extended.info[2] <<8)|
X (sense->ext.extended.info[3] ));
X }
X else
X {
X printf("\n");
X }
X }
X return(EACCES);
X case 0x8:
X if(!silent)
X {
X printf("st%d: block wrong state (worm)\n "
X , unit);
X if(sense->valid)
X {
X printf("block no. %d (decimal)\n",
X (sense->ext.extended.info[0] <<24)|
X (sense->ext.extended.info[1] <<16)|
X (sense->ext.extended.info[2] <<8)|
X (sense->ext.extended.info[3] ));
X }
X else
X {
X printf("\n");
X }
X }
X return(EIO);
X case 0x9:
X if(!silent) printf("st%d: vendor unique\n",
X unit);
X return(EIO);
X case 0xa:
X if(!silent) printf("st%d: copy aborted\n ",
X unit);
X return(EIO);
X case 0xb:
X if(!silent) printf("st%d: command aborted\n ",
X unit);
X return(EIO);
X case 0xc:
X if(!silent)
X {
X printf("st%d: search returned\n ", unit);
X if(sense->valid)
X {
X printf("block no. %d (decimal)\n",
X (sense->ext.extended.info[0] <<24)|
X (sense->ext.extended.info[1] <<16)|
X (sense->ext.extended.info[2] <<8)|
X (sense->ext.extended.info[3] ));
X }
X else
X {
X printf("\n");
X }
X }
X return(ESUCCESS);
X case 0xd:
X if(!silent) printf("st%d: volume overflow\n ",
X unit);
X return(ENOSPC);
X case 0xe:
X if(!silent)
X {
X printf("st%d: verify miscompare\n ", unit);
X if(sense->valid)
X {
X printf("block no. %d (decimal)\n",
X (sense->ext.extended.info[0] <<24)|
X (sense->ext.extended.info[1] <<16)|
X (sense->ext.extended.info[2] <<8)|
X (sense->ext.extended.info[3] ));
X }
X else
X {
X printf("\n");
X }
X }
X return(EIO);
X case 0xf:
X if(!silent) printf("st%d: unknown error key\n ",
X unit);
X return(EIO);
X }
X break;
X }
X /***************************************************************\
X * If it's NOT class 7, just report it. *
X \***************************************************************/
X case 0:
X case 1:
X case 2:
X case 3:
X case 4:
X case 5:
X case 6:
X {
X if(!silent) printf("st%d: error class %d code %d\n",
X unit,
X sense->error_class,
X sense->error_code);
X if(sense->valid)
X if(!silent) printf("block no. %d (decimal)\n",
X (sense->ext.unextended.blockhi <<16),
X + (sense->ext.unextended.blockmed <<8),
X + (sense->ext.unextended.blocklow ));
X }
X return(EIO);
X }
X}
X
X#if defined(OSF)
X
Xstsize(dev_t dev)
X{
X printf("stsize() -- not implemented\n");
X return(0);
X}
X
Xstdump()
X{
X printf("stdump() -- not implemented\n");
X return(-1);
X}
X
X#endif /* defined(OSF) */
X
END-of-scsi/st.c
exit
--
osynw@terra.oscs.montana.edu | Still trying to find a good reason for
nate@cs.montana.edu | these 'computer' things. Personally,
work #: (406) 994-4836 | I don't think they'll catch on -
home #: (406) 586-0579 | Don Hammerstrom