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freebsd/sys/scsi/st.c
Rodney W. Grimes 0e08d66ab8 >From: Julian Elischer <julian@jules.DIALix.oz.au> 
Subject: Re: Error reading from DAT (fwd)
Date: Mon, 11 Oct 1993 03:02:39 -40962758 (WST)

Some tapes won't do anything until you tell them to load.
Other tapes think that being asked to load is a great excuse to
make the next command return a "unit attention" (media changed) error.
Since we need to do the load, throw in a dummy instruction to cop the
error.

specifically for DEC DAT drives.
1993-10-11 04:53:23 +00:00

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/*
* Written by Julian Elischer (julian@tfs.com)(now julian@DIALix.oz.au)
* 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
* 1.15 is the last verion to support MACH and OSF/1
*/
/* $Revision: 1.9 $ */
/*
* Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
* major changes by Julian Elischer (julian@jules.dialix.oz.au) May 1993
*
* $Id: st.c,v 1.9 1993/09/20 06:27:06 rgrimes Exp $
*/
/*
* 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 <fcntl.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/mtio.h>
#include <scsi/scsi_all.h>
#include <scsi/scsi_tape.h>
#include <scsi/scsiconf.h>
long int ststrats,stqueues;
/* Defines for device specific stuff */
#define PAGE_0_SENSE_DATA_SIZE 12
#define PAGESIZ 4096
#define DEF_FIXED_BSIZE 512
#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 DSTY3 3
#define DSTY2 2
#define DSTY1 1
#define SCSI_2_MAX_DENSITY_CODE 0x17 /* maximum density code specified
in SCSI II spec. */
/***************************************************************\
* Define various devices that we know mis-behave in some way, *
* and note how they are bad, so we can correct for them *
\***************************************************************/
struct modes
{
int quirks; /* same definitions as in rogues */
char density;
char spare[3];
};
struct rogues
{
char *name;
char *manu;
char *model;
char *version;
int quirks; /* valid for all modes */
struct modes modes[4];
};
/* define behaviour codes (quirks) */
#define ST_Q_NEEDS_PAGE_0 0x00001
#define ST_Q_FORCE_FIXED_MODE 0x00002
#define ST_Q_FORCE_VAR_MODE 0x00004
#define ST_Q_SNS_HLP 0x00008 /* must do READ for good MODE SENSE */
#define ST_Q_IGNORE_LOADS 0x00010
#define ST_Q_BLKSIZ 0x00020 /* variable-block media_blksiz > 0 */
static struct rogues gallery[] = /* ends with an all null entry */
{
{ "Such an old device ", "pre-scsi", " unknown model ","????",
0,
{ {ST_Q_FORCE_FIXED_MODE,0}, /* minor 0,1,2,3 */
{ST_Q_FORCE_FIXED_MODE,QIC_24}, /* minor 4,5,6,7 */
{ST_Q_FORCE_VAR_MODE,HALFINCH_1600}, /* minor 8,9,10,11*/
{ST_Q_FORCE_VAR_MODE,HALFINCH_6250} /* minor 12,13,14,15*/
}
},
{ "Tandberg tdc3600", "TANDBERG", " TDC 3600","????",
ST_Q_NEEDS_PAGE_0,
{ {0,0}, /* minor 0,1,2,3*/
{ST_Q_FORCE_VAR_MODE,QIC_525}, /* minor 4,5,6,7*/
{0,QIC_150}, /* minor 8,9,10,11*/
{0,QIC_120} /* minor 12,13,14,15*/
}
},
{ "Rev 5 of the Archive 2525", "ARCHIVE ", "VIPER 2525 25462","-005",
0,
{ {ST_Q_SNS_HLP,0}, /* minor 0,1,2,3*/
{ST_Q_SNS_HLP,QIC_525}, /* minor 4,5,6,7*/
{0,QIC_150}, /* minor 8,9,10,11*/
{0,QIC_120} /* minor 12,13,14,15*/
}
},
{ "Archive Viper 150", "ARCHIVE ", "VIPER 150","????",
ST_Q_NEEDS_PAGE_0,
{ {0,0}, /* minor 0,1,2,3*/
{0,QIC_150}, /* minor 4,5,6,7*/
{0,QIC_120}, /* minor 8,9,10,11*/
{0,QIC_24} /* minor 12,13,14,15*/
}
},
{ "Wangtek 5525ES", "WANGTEK ", "5525ES SCSI REV7", "????",
0,
{ {0,0}, /* minor 0,1,2,3*/
{ST_Q_BLKSIZ,QIC_525}, /* minor 4,5,6,7*/
{0,QIC_150}, /* minor 8,9,10,11*/
{0,QIC_120} /* minor 12,13,14,15*/
}
},
{(char *)0}
};
int ststrategy();
void stminphys();
#define ESUCCESS 0
#ifdef STDEBUG
int st_debug = 1;
#endif /*STDEBUG*/
int stattach();
int st_done();
struct st_data
{
/*--------------------present operating parameters, flags etc.----------------*/
int flags; /* see below */
int blksiz; /* blksiz we are using */
int density; /* present density */
int quirks; /* quirks for the open mode */
int last_dsty; /* last density used */
/*--------------------device/scsi parameters----------------------------------*/
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; /* our scsi lu */
/*--------------------parameters reported by the device ----------------------*/
int blkmin; /* min blk size */
int blkmax; /* max blk size */
/*--------------------parameters reported by the device for this media--------*/
int numblks; /* nominal blocks capacity */
int media_blksiz; /* 0 if not ST_FIXEDBLOCKS */
int media_density; /* this is what it said when asked */
/*--------------------quirks for the whole drive------------------------------*/
int drive_quirks; /* quirks of this drive */
/*--------------------How we should set up when openning each minor device----*/
struct modes modes[4]; /* plus more for each mode */
/*--------------------storage for sense data returned by the drive------------*/
unsigned char sense_data[12]; /* additional sense data needed */
/* for mode sense/select. */
struct buf *buf_queue; /* the queue of pending IO operations */
struct scsi_xfer scsi_xfer; /* The scsi xfer struct for this drive*/
int xfer_block_wait; /* whether there is a process waiting */
}*st_data[NST];
#define ST_INITIALIZED 0x01
#define ST_INFO_VALID 0x02
#define ST_OPEN 0x04
#define ST_BLOCK_SET 0x08 /* block size, mode set by ioctl */
#define ST_WRITTEN 0x10 /* data have been written, EOD needed */
#define ST_FIXEDBLOCKS 0x20
#define ST_AT_FILEMARK 0x40
#define ST_EIO_PENDING 0x80 /* we couldn't report it then (had data)*/
#define ST_AT_BOM 0x100 /* ops history suggests Beg of Medium */
#define ST_READONLY 0x200 /* st_mode_sense says write protected */
#define ST_FM_WRITTEN 0x400 /* EOF file mark written -- */
/* used with ~ST_WRITTEN to indicate */
/* that multiple file marks have been */
/* written */
#define ST_BLANK_READ 0x800 /* BLANK CHECK encountered already */
#define ST_2FM_AT_EOD 0x1000 /* write 2 file marks at EOD */
#define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ)
#define ST_PER_OPEN ST_OPEN
#define ST_PER_MEDIA (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \
ST_FIXEDBLOCKS | ST_AT_BOM | ST_READONLY | \
ST_FM_WRITTEN | ST_2FM_AT_EOD | ST_PER_ACTION)
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;
struct st_data *st;
#ifdef STDEBUG
if(scsi_debug & PRINTROUTINES) printf("stattach: ");
#endif /*STDEBUG*/
/*******************************************************\
* Check we have the resources for another drive *
\*******************************************************/
unit = next_st_unit++;
if( unit >= NST)
{
printf("Too many scsi tapes..(%d > %d) reconfigure kernel\n",
(unit + 1),NST);
return(0);
}
if(st_data[unit])
{
printf("st%d: Already has storage!\n",unit);
return(0);
}
st = st_data[unit] = malloc(sizeof(struct st_data),M_DEVBUF,M_NOWAIT);
if(!st)
{
printf("st%d: malloc failed in st.c\n",unit);
return(0);
}
bzero(st,sizeof(struct st_data));
/*******************************************************\
* Store information needed to contact our base driver *
\*******************************************************/
st->sc_sw = scsi_switch;
st->ctlr = ctlr;
st->targ = targ;
st->lu = lu;
/*******************************************************\
* Store information about default densities *
\*******************************************************/
st->modes[DSTY1].density = QIC_525;
st->modes[DSTY2].density = QIC_150;
st->modes[DSTY3].density = QIC_120;
/*******************************************************\
* Check if the drive is a known criminal and take *
* Any steps needed to bring it into line *
\*******************************************************/
st_identify_drive(unit);
/*******************************************************\
* 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: drive offline\n", unit);
}
else
{
if(!st_test_ready(unit,SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT))
{
printf("st%d: density code 0x%x, ",
unit, st->media_density);
if (st->media_blksiz)
{
printf("%d-byte", st->media_blksiz);
}
else
{
printf("variable");
}
printf(" blocks, write-%s\n",
st->flags & ST_READONLY ? "protected" : "enabled");
}
else
{
printf("st%d: drive empty\n", unit);
}
}
/*******************************************************\
* Set up the bufs for this device *
\*******************************************************/
st->buf_queue = 0;
st->flags |= ST_INITIALIZED;
return;
}
/***********************************************************************\
* Use the identify routine in 'scsiconf' to get drive info so we can *
* Further tailor our behaviour. *
\***********************************************************************/
st_identify_drive(unit)
int unit;
{
struct st_data *st = st_data[unit];
struct scsi_inquiry_data inqbuf;
struct rogues *finger;
char manu[32];
char model[32];
char model2[32];
char version[32];
int model_len;
/*******************************************************\
* Get the device type information *
\*******************************************************/
if (scsi_inquire(st->ctlr, st->targ, st->lu, st->sc_sw, &inqbuf,
SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT) != COMPLETE)
{
printf("st%d: couldn't get device type, using default\n", unit);
return;
}
if((inqbuf.version & SID_ANSII) == 0)
{
/***********************************************\
* If not advanced enough, use default values *
\***********************************************/
strncpy(manu,"pre-scsi",8);manu[8]=0;
strncpy(model," unknown model ",16);model[16]=0;
strncpy(version,"????",4);version[4]=0;
}
else
{
strncpy(manu,inqbuf.vendor,8);manu[8]=0;
strncpy(model,inqbuf.product,16);model[16]=0;
strncpy(version,inqbuf.revision,4);version[4]=0;
}
/*******************************************************\
* Load the parameters for this kind of device, so we *
* treat it as appropriate for each operating mode *
* Only check the number of characters in the array's *
* model entry, not the entire model string returned. *
\*******************************************************/
finger = gallery;
while(finger->name)
{
model_len = 0;
while(finger->model[model_len] && (model_len < 32))
{
model2[model_len] = model[model_len];
model_len++;
}
model2[model_len] = 0;
if ((strcmp(manu, finger->manu) == 0 )
&& (strcmp(model2, finger->model) == 0 ||
strcmp("????????????????", finger->model) == 0)
&& (strcmp(version, finger->version) == 0 ||
strcmp("????", finger->version) == 0))
{
printf("st%d: %s is a known rogue\n", unit,finger->name);
st->modes[0] = finger->modes[0];
st->modes[1] = finger->modes[1];
st->modes[2] = finger->modes[2];
st->modes[3] = finger->modes[3];
st->drive_quirks= finger->quirks;
st->quirks = finger->quirks; /*start value*/
break;
}
else
{
finger++; /* go to next suspect */
}
}
}
/*******************************************************\
* open the device. *
\*******************************************************/
stopen(dev, flags)
int dev, flags;
{
int unit,mode,dsty;
int errno = 0;
struct st_data *st;
unit = UNIT(dev);
mode = MODE(dev);
dsty = DSTY(dev);
/*******************************************************\
* Check the unit is legal *
\*******************************************************/
if ( unit >= NST )
{
return(ENXIO);
}
st = st_data[unit];
/*******************************************************\
* Make sure the device has been initialised *
\*******************************************************/
if ((st == NULL) || (!(st->flags & ST_INITIALIZED)))
return(ENXIO);
/*******************************************************\
* Only allow one at a time *
\*******************************************************/
if(st->flags & ST_OPEN)
{
return(ENXIO);
}
/*******************************************************\
* Throw out a dummy instruction to catch 'Unit attention*
* errors (the error handling will invalidate all our *
* device info if we get one, but otherwise, ignore it *
\*******************************************************/
st_test_ready(unit, SCSI_SILENT);
/***************************************************************\
* Check that the device is ready to use (media loaded?) *
* This time take notice of the return result *
\***************************************************************/
if(errno = (st_test_ready(unit,0)))
{
printf("st%d: not ready\n",unit);
return(errno);
}
/*******************************************************\
* Set up the mode flags according to the minor number *
* ensure all open flags are in a known state *
* if it's a different mode, dump all cached parameters *
\*******************************************************/
if(st->last_dsty != dsty || !(st->flags & ST_INFO_VALID))
{
st->flags &= ~ST_INFO_VALID;
st->last_dsty = dsty;
st->quirks = st->drive_quirks | st->modes[dsty].quirks;
st->density = st->modes[dsty].density;
}
st->flags &= ~ST_PER_OPEN;
#ifdef STDEBUG
if(scsi_debug & (PRINTROUTINES | TRACEOPENS))
printf("stopen: dev=0x%x (unit %d (of %d))\n"
, dev, unit, NST);
#endif /*STDEBUG*/
/***************************************************************\
* If the media is new, then make sure we give it a chance to *
* to do a 'load' instruction. *
\***************************************************************/
if(!(st->flags & ST_INFO_VALID)) /* is media new? */
{
if(errno = st_load(unit,LD_LOAD,0))
{
return(errno);
}
st_test_ready(unit,0);
if(st->quirks & ST_Q_SNS_HLP)
{
/***********************************************\
* The quirk here is that the drive returns some *
* value to st_mode_sense incorrectly until the *
* tape has actually passed by the head. *
* *
* The method is to set the drive to large *
* fixed-block state (user-specified density and *
* 1024-byte blocks), then read and rewind to *
* get it to sense the tape. If that doesn't *
* work, try 512-byte fixed blocks. If that *
* doesn't work, as a last resort, try variable- *
* length blocks. The result will be the *
* ability to do an accurate st_mode_sense. *
* *
* We pretend not to be at beginning of medium *
* to keep st_read from calling st_decide_mode. *
* *
* We know we can do a rewind because we just *
* did a load, which implies rewind. Rewind *
* seems preferable to space backward if we have *
* a virgin tape. *
* *
* The rest of the code for this quirk is in ILI *
* processing and BLANK CHECK error processing, *
* both part of st_interpret_sense. *
\***********************************************/
char *buf;
int readsiz;
buf = malloc(1024,M_TEMP,M_NOWAIT);
if(!buf) return(ENOMEM);
if (errno = st_mode_sense(unit, 0))
{
goto bad;
}
st->blksiz = 1024;
do {
switch (st->blksiz)
{
case 512:
case 1024:
readsiz = st->blksiz;
st->flags |= ST_FIXEDBLOCKS;
break;
default:
readsiz = 1;
st->flags &= ~ST_FIXEDBLOCKS;
}
if (errno = st_mode_select(unit, 0))
{
goto bad;
}
st->flags &= ~ST_AT_BOM;
st_read(unit, buf, readsiz, SCSI_SILENT);
if (errno = st_rewind(unit, FALSE, 0))
{
bad: free(buf,M_TEMP);
return(errno);
}
} while (readsiz != 1 && readsiz > st->blksiz);
free(buf,M_TEMP);
}
}
/*******************************************************\
* Load the physical device parameters *
* loads: blkmin, blkmax *
\*******************************************************/
if(errno = st_rd_blk_lim(unit,0))
{
return(errno);
}
/*******************************************************\
* Load the media dependent parameters *
* includes: media_blksiz,media_density,numblks *
\*******************************************************/
if(errno = st_mode_sense(unit,0))
{
return(errno);
}
if (!(st->flags & ST_INFO_VALID) && dsty == 0)
{
/*******************************************************\
* If the user defaulted the density, use the drive's *
* opinion of it. *
\*******************************************************/
st->quirks = st->drive_quirks;
st->density = st->media_density;
do {
if (st->density == st->modes[dsty].density)
{
st->quirks |= st->modes[dsty].quirks;
#ifdef STDEBUG
if(st_debug) printf("selected density %d\n", dsty);
#endif /*STDEBUG*/
break; /* only out of the loop*/
}
} while (++dsty < 4);
/*******************************************************\
* If dsty got to 4, the drive must have reported a *
* density which isn't in our density list (e.g. QIC-24 *
* for a default drive). We can handle that, except *
* there'd better be no density-specific quirks in the *
* drive's behavior. *
\*******************************************************/
}
/***************************************************************\
* Decide whether or not to write two file marks to signify end- *
* of-data. Make the decision as a function of density. If *
* the decision is not to use a second file mark, the SCSI BLANK *
* CHECK condition code will be recognized as end-of-data when *
* first read. *
\***************************************************************/
switch (st->density)
{
/* case 8 mm: What is the SCSI density code for 8 mm, anyway? */
case QIC_11:
case QIC_24:
case QIC_120:
case QIC_150:
case QIC_525:
case QIC_1320:
st->flags &= ~ST_2FM_AT_EOD;
break;
default:
st->flags |= ST_2FM_AT_EOD;
}
/***************************************************************\
* Make sure that a tape opened in write-only mode will have *
* file marks written on it. This is the only way to write a *
* zero-length file on tape. *
\***************************************************************/
if ((flags & O_ACCMODE) == FWRITE)
st->flags |= ST_WRITTEN;
st->flags |= ST_INFO_VALID;
st_prevent(unit,PR_PREVENT,0); /* who cares if it fails? */
#ifdef STDEBUG
if(scsi_debug & TRACEOPENS)
printf("Params loaded ");
#endif /*STDEBUG*/
st->flags |= ST_OPEN;
return(0);
}
/*******************************************************\
* 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];
#ifdef STDEBUG
if(scsi_debug & TRACEOPENS)
printf("Closing device");
#endif /*STDEBUG*/
switch(mode)
{
case 0:
st_rewind(unit,FALSE,SCSI_SILENT);
st_prevent(unit,PR_ALLOW,SCSI_SILENT);
st->flags &= ~ST_PER_MEDIA;
break;
case 1: /*non rewind*/
if((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN)
st_write_filemarks(unit, 1, 0);
break;
case 2:
st_rewind(unit,FALSE,SCSI_SILENT);
st_prevent(unit,PR_ALLOW,SCSI_SILENT);
st_load(unit,LD_UNLOAD,SCSI_SILENT);
st->flags &= ~ST_PER_MEDIA;
break;
case 3:/* a bit silly really */
st_prevent(unit,PR_ALLOW,SCSI_SILENT);
st_load(unit,LD_UNLOAD,SCSI_SILENT);
st->flags &= ~ST_PER_MEDIA;
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);
}
/***************************************************************\
* Given all we know about the device, media, mode, 'quirks' and *
* initial operation, make a decision as to how we should be set *
* up. First, choose the density, then variable/fixed blocks. *
\***************************************************************/
st_decide_mode(unit, first_read)
int unit, first_read;
{
int dsty, error;
struct st_data *st = st_data[unit];
/***************************************************************\
* First, if our information about the tape is out of date, get *
* new information. *
\***************************************************************/
if (!(st->flags & ST_INFO_VALID))
{
if (error = st_mode_sense(unit, 0))
return (error);
st->flags |= ST_INFO_VALID;
}
#ifdef STDEBUG
if(st_debug) printf("starting mode decision\n");
#endif /*STDEBUG*/
/***************************************************************\
* If the user has already specified fixed or variable-length *
* blocks using an ioctl, just believe him. OVERRIDE ALL *
\***************************************************************/
if (st->flags & ST_BLOCK_SET)
{
#ifdef STDEBUG
if(st_debug) printf("user has specified %s mode\n",
st->flags & ST_FIXEDBLOCKS ? "fixed" : "variable");
#endif /*STDEBUG*/
goto done;
}
/***************************************************************\
* If the user hasn't already specified fixed or variable-length *
* blocks and the block size (zero if variable-length), we'll *
* have to try to figure them out ourselves. *
* *
* Our first shot at a method is, "The quirks made me do it!" *
\***************************************************************/
switch (st->quirks & (ST_Q_FORCE_FIXED_MODE | ST_Q_FORCE_VAR_MODE))
{
case (ST_Q_FORCE_FIXED_MODE | ST_Q_FORCE_VAR_MODE):
printf("st%d: bad quirks\n",unit);
return (EINVAL);
case ST_Q_FORCE_FIXED_MODE:
st->flags |= ST_FIXEDBLOCKS;
if (st->blkmin && (st->blkmin == st->blkmax))
st->blksiz = st->blkmin;
else if(st->media_blksiz > 0)
st->blksiz = st->media_blksiz;
else
st->blksiz = DEF_FIXED_BSIZE;
#ifdef STDEBUG
if(st_debug) printf("Quirks force fixed mode\n");
#endif /*STDEBUG*/
goto done;
case ST_Q_FORCE_VAR_MODE:
st->flags &= ~ST_FIXEDBLOCKS;
st->blksiz = 0;
#ifdef STDEBUG
if(st_debug) printf("Quirks force variable mode\n");
#endif /*STDEBUG*/
goto done;
}
/***************************************************************\
* If the drive can only handle fixed-length blocks and only at *
* one size, perhaps we should just do that. *
\***************************************************************/
if (st->blkmin && (st->blkmin == st->blkmax))
{
st->flags |= ST_FIXEDBLOCKS;
st->blksiz = st->blkmin;
#ifdef STDEBUG
if(st_debug) printf("blkmin == blkmax of %d\n",st->blkmin);
#endif /*STDEBUG*/
goto done;
}
/***************************************************************\
* If the tape density mandates use of fixed or variable-length *
* blocks, comply. *
\***************************************************************/
switch (st->density)
{
case HALFINCH_800:
case HALFINCH_1600:
case HALFINCH_6250:
case DDS:
st->flags &= ~ST_FIXEDBLOCKS;
st->blksiz = 0;
#ifdef STDEBUG
if(st_debug) printf("density specified variable\n");
#endif /*STDEBUG*/
goto done;
case QIC_11:
case QIC_24:
case QIC_120:
case QIC_150:
st->flags |= ST_FIXEDBLOCKS;
if (st->media_blksiz > 0)
st->blksiz = st->media_blksiz;
else
st->blksiz = DEF_FIXED_BSIZE;
#ifdef STDEBUG
if(st_debug) printf("density specified fixed\n");
#endif /*STDEBUG*/
goto done;
}
/***************************************************************\
* If we're about to read the tape, perhaps we should choose *
* fixed or variable-length blocks and block size according to *
* what the drive found on the tape. *
\***************************************************************/
if (first_read && (!(st->quirks & ST_Q_BLKSIZ) || st->media_blksiz == 0
|| st->media_blksiz == DEF_FIXED_BSIZE || st->media_blksiz == 1024))
{
if (st->media_blksiz == 0)
st->flags &= ~ST_FIXEDBLOCKS;
else
st->flags |= ST_FIXEDBLOCKS;
st->blksiz = st->media_blksiz;
#ifdef STDEBUG
if(st_debug) printf("Used media_blksiz of %d\n",st->media_blksiz);
#endif /*STDEBUG*/
goto done;
}
/***************************************************************\
* We're getting no hints from any direction. Choose variable- *
* length blocks arbitrarily. *
\***************************************************************/
st->flags &= ~ST_FIXEDBLOCKS;
st->blksiz = 0;
#ifdef STDEBUG
if(st_debug) printf("Give up and default to variable mode\n");
#endif /*STDEBUG*/
done:
st->flags &= ~ST_AT_BOM;
return (st_mode_select(unit, 0));
}
/*******************************************************\
* 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;
struct st_data *st;
ststrats++;
unit = UNIT((bp->b_dev));
st = st_data[unit];
#ifdef STDEBUG
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);
#endif /*STDEBUG*/
/*******************************************************\
* If it's a null transfer, return immediatly *
\*******************************************************/
if (bp->b_bcount == 0)
{
goto done;
}
/*******************************************************\
* If we're at beginning of medium, now is the time to *
* set medium access density, fixed or variable-blocks *
* and, if fixed, the block size. *
\*******************************************************/
if (st->flags & ST_AT_BOM &&
(bp->b_error = st_decide_mode(unit, (bp->b_flags & B_READ) != 0)))
goto bad;
/*******************************************************\
* Odd sized request on fixed drives are verboten *
\*******************************************************/
if(st->flags & ST_FIXEDBLOCKS)
{
if(bp->b_bcount % st->blksiz)
{
printf("st%d: bad request, must be multiple of %d\n",
unit, st->blksiz);
bp->b_error = EIO;
goto bad;
}
}
/*******************************************************\
* as are out-of-range requests on variable drives. *
\*******************************************************/
else if(bp->b_bcount < st->blkmin || bp->b_bcount > st->blkmax)
{
printf("st%d: bad request, must be between %d and %d\n",
unit, st->blkmin, st->blkmax);
bp->b_error = EIO;
goto bad;
}
stminphys(bp);
opri = splbio();
/*******************************************************\
* Place it in the queue of activities for this tape *
* at the end (a bit silly because we only have on user..*
* (but it could fork() )) *
\*******************************************************/
dp = &(st->buf_queue);
while (*dp)
{
dp = &((*dp)->b_actf);
}
*dp = 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*
* (All a bit silly if we're only allowing 1 open but..) *
\*******************************************************/
ststart(unit);
splx(opri);
return;
bad:
bp->b_flags |= B_ERROR;
done:
/*******************************************************\
* Correctly set the buf to indicate a completed xfer *
\*******************************************************/
iodone(bp);
return;
}
/*******************************************************\
* 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;
{
int errcode = 0;
unsigned char unit;
int number,flags,dsty;
struct st_data *st;
/*******************************************************\
* Find the device that the user is talking about *
\*******************************************************/
flags = 0; /* give error messages, act on errors etc. */
unit = UNIT(dev);
dsty = DSTY(dev);
st = st_data[unit];
switch(cmd)
{
case MTIOCGET:
{
struct mtget *g = (struct mtget *) arg;
bzero(g, sizeof(struct mtget));
g->mt_type = 0x7; /* Ultrix compat */ /*?*/
if (st->flags & ST_FIXEDBLOCKS) {
g->mt_bsiz = st->blksiz;
} else {
g->mt_bsiz = 0;
}
g->mt_dns_dflt = st->modes[0].density;
g->mt_dns_dsty1 = st->modes[DSTY1].density;
g->mt_dns_dsty2 = st->modes[DSTY2].density;
g->mt_dns_dsty3 = st->modes[DSTY3].density;
break;
}
case MTIOCTOP:
{
int nmarks;
struct mtop *mt = (struct mtop *) arg;
#ifdef STDEBUG
if (st_debug)
printf("[sctape_sstatus: %x %x]\n",
mt->mt_op, mt->mt_count);
#endif /*STDEBUG*/
/* 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 */
errcode = st_write_filemarks(unit,number,flags);
break;
case MTBSF: /* backward space file */
number = -number;
case MTFSF: /* forward space file */
errcode = st_chkeod(unit, FALSE, &nmarks, flags);
if (errcode == ESUCCESS)
errcode = st_space(unit, number - nmarks,
SP_FILEMARKS, flags);
break;
case MTBSR: /* backward space record */
number = -number;
case MTFSR: /* forward space record */
errcode = st_chkeod(unit, TRUE, &nmarks, flags);
if (errcode == ESUCCESS)
errcode = st_space(unit,number,SP_BLKS,flags);
break;
case MTREW: /* rewind */
errcode = st_rewind(unit,FALSE,flags);
break;
case MTOFFL: /* rewind and put the drive offline */
if(st_rewind(unit,FALSE,flags))
{
printf("st%d: rewind failed, unit still loaded\n",
unit);
}
else
{
st_prevent(unit,PR_ALLOW,0);
st_load(unit,LD_UNLOAD,flags);
}
break;
case MTNOP: /* no operation, sets status only */
case MTCACHE: /* enable controller cache */
case MTNOCACHE: /* disable controller cache */
break;
case MTSETBSIZ: /* Set block size for device */
if (!(st->flags & ST_AT_BOM))
{
errcode = EINVAL;
break;
}
if (number == 0)
{
st->flags &= ~ST_FIXEDBLOCKS;
}
else
{
if ((st->blkmin || st->blkmax) /* they exist */
&& ((number < st->blkmin
|| number > st->blkmax)))
{
errcode = EINVAL;
break;
}
st->flags |= ST_FIXEDBLOCKS;
}
st->blksiz = number;
st->flags |= ST_BLOCK_SET;
break;
/* How do we check that the drive can handle
the requested density ? */
case MTSETDNSTY: /* Set density for device and mode */
if (number < 0 || number > SCSI_2_MAX_DENSITY_CODE)
{
errcode = EINVAL;
}
else
{
st->modes[dsty].density = number;
}
break;
default:
errcode = EINVAL;
}
break;
}
case MTIOCIEOT:
case MTIOCEEOT:
break;
default:
errcode = EINVAL;
}
return errcode;
}
/*******************************************************\
* Do a synchronous read. *
\*******************************************************/
int st_read(unit, buf, size, flags)
int unit, size, flags;
char *buf;
{
int error;
struct scsi_rw_tape scsi_cmd;
struct st_data *st = st_data[unit];
/*******************************************************\
* If it's a null transfer, return immediatly *
\*******************************************************/
if (size == 0)
{
return(ESUCCESS);
}
/*******************************************************\
* If we're at beginning of medium, now is the time to *
* set medium access density, fixed or variable-blocks *
* and, if fixed, the block size. *
\*******************************************************/
if (st->flags & ST_AT_BOM && (error = st_decide_mode(unit, TRUE)))
return (error);
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = READ_COMMAND_TAPE;
scsi_cmd.byte2 |= st->flags & ST_FIXEDBLOCKS ? SRWT_FIXED : 0;
lto3b(scsi_cmd.byte2 & SRWT_FIXED ?
size / (st->blksiz ? st->blksiz : DEF_FIXED_BSIZE) : size,
scsi_cmd.len);
return (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
buf,
size,
100000,
NULL,
flags | SCSI_DATA_IN));
}
/*******************************************************\
* 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;
return (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
0,
0,
100000,
NULL,
flags));
}
#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];
int errno;
/*******************************************************\
* First check if we have it all loaded *
\*******************************************************/
if ((st->flags & ST_INFO_VALID)) return 0;
/*******************************************************\
* 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 ( errno = st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
&scsi_blkl,
sizeof(scsi_blkl),
5000,
NULL,
flags | SCSI_DATA_IN))
{
return errno;
}
st->blkmin = b2tol(scsi_blkl.min_length);
st->blkmax = _3btol(&scsi_blkl.max_length_2);
#ifdef STDEBUG
if (st_debug)
{
printf("(%d <= blksiz <= %d)\n", st->blkmin, st->blkmax);
}
#endif /*STDEBUG*/
return 0;
}
/*******************************************************\
* Get the scsi driver to send a full inquiry to the *
* device and use the results to fill out the global *
* parameter structure. *
* *
* called from: *
* attach *
* open *
* ioctl (to reset original blksize) *
\*******************************************************/
st_mode_sense(unit, flags)
int unit,flags;
{
int scsi_sense_len;
int errno;
char *scsi_sense_ptr;
struct scsi_mode_sense scsi_cmd;
struct scsi_sense
{
struct scsi_mode_header header;
struct blk_desc blk_desc;
}scsi_sense;
struct scsi_sense_page_0
{
struct scsi_mode_header header;
struct blk_desc blk_desc;
unsigned char sense_data[PAGE_0_SENSE_DATA_SIZE];
/* Tandberg tape drives returns page 00 */
/* with the sense data, whether or not */
/* you want it( ie the don't like you */
/* saying you want anything less!!!!! */
/* They also expect page 00 */
/* back when you issue a mode select */
}scsi_sense_page_0;
struct st_data *st = st_data[unit];
/*******************************************************\
* First check if we have it all loaded *
\*******************************************************/
if ((st->flags & ST_INFO_VALID)) return 0;
/*******************************************************\
* Define what sort of structure we're working with *
\*******************************************************/
if (st->quirks & ST_Q_NEEDS_PAGE_0)
{
scsi_sense_len = sizeof(scsi_sense_page_0);
scsi_sense_ptr = (char *) &scsi_sense_page_0;
}
else
{
scsi_sense_len = sizeof(scsi_sense);
scsi_sense_ptr = (char *) &scsi_sense;
}
/*******************************************************\
* Set up a mode sense *
\*******************************************************/
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = MODE_SENSE;
scsi_cmd.length = scsi_sense_len;
/*******************************************************\
* do the command, but we don't need the results *
* just print them for our interest's sake, if asked, *
* or if we need it as a template for the mode select *
* store it away. *
\*******************************************************/
if (errno = st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
scsi_sense_ptr,
scsi_sense_len,
5000,
NULL,
flags | SCSI_DATA_IN) )
{
return errno;
}
st->numblks = _3btol(&(((struct scsi_sense *)scsi_sense_ptr)->blk_desc.nblocks));
st->media_blksiz = _3btol(&(((struct scsi_sense *)scsi_sense_ptr)->blk_desc.blklen));
st->media_density = ((struct scsi_sense *)scsi_sense_ptr)->blk_desc.density;
if (((struct scsi_sense *)scsi_sense_ptr)->header.dev_spec &
SMH_DSP_WRITE_PROT)
st->flags |= ST_READONLY;
#ifdef STDEBUG
if (st_debug)
{
printf("st%d: density code 0x%x, %d-byte blocks, write-%s, ",
unit, st->media_density, st->media_blksiz,
st->flags & ST_READONLY ? "protected" : "enabled");
printf("%sbuffered\n",
((struct scsi_sense *)scsi_sense_ptr)->header.dev_spec
& SMH_DSP_BUFF_MODE ? "" : "un");
}
#endif /*STDEBUG*/
if (st->quirks & ST_Q_NEEDS_PAGE_0)
{
bcopy(((struct scsi_sense_page_0 *)scsi_sense_ptr)->sense_data,
st->sense_data,
sizeof(((struct scsi_sense_page_0 *)scsi_sense_ptr)->sense_data));
}
return 0;
}
/*******************************************************\
* Send a filled out parameter structure to the drive to *
* set it into the desire modes etc. *
\*******************************************************/
st_mode_select(unit, flags)
int unit, flags;
{
int dat_len;
char *dat_ptr;
struct scsi_mode_select scsi_cmd;
struct dat
{
struct scsi_mode_header header;
struct blk_desc blk_desc;
}dat;
struct dat_page_0
{
struct scsi_mode_header header;
struct blk_desc blk_desc;
unsigned char sense_data[PAGE_0_SENSE_DATA_SIZE];
}dat_page_0;
struct st_data *st = st_data[unit];
/*******************************************************\
* Define what sort of structure we're working with *
\*******************************************************/
if (st->quirks & ST_Q_NEEDS_PAGE_0)
{
dat_len = sizeof(dat_page_0);
dat_ptr = (char *) &dat_page_0;
}
else
{
dat_len = sizeof(dat);
dat_ptr = (char *) &dat;
}
/*******************************************************\
* Set up for a mode select *
\*******************************************************/
bzero(dat_ptr, dat_len);
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = MODE_SELECT;
scsi_cmd.length = dat_len;
((struct dat *)dat_ptr)->header.blk_desc_len = sizeof(struct blk_desc);
((struct dat *)dat_ptr)->header.dev_spec |= SMH_DSP_BUFF_MODE_ON;
((struct dat *)dat_ptr)->blk_desc.density = st->density;
if(st->flags & ST_FIXEDBLOCKS)
{
lto3b( st->blksiz , ((struct dat *)dat_ptr)->blk_desc.blklen);
}
if (st->quirks & ST_Q_NEEDS_PAGE_0)
{
bcopy(st->sense_data, ((struct dat_page_0 *)dat_ptr)->sense_data,
sizeof(((struct dat_page_0 *)dat_ptr)->sense_data));
/* the Tandberg tapes need the block size to */
/* be set on each mode sense/select. */
}
/*******************************************************\
* do the command *
\*******************************************************/
return (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
dat_ptr,
dat_len,
5000,
NULL,
flags | SCSI_DATA_OUT) );
}
/*******************************************************\
* skip N blocks/filemarks/seq filemarks/eom *
\*******************************************************/
st_space(unit,number,what,flags)
int unit,number,what,flags;
{
int error;
struct scsi_space scsi_cmd;
struct st_data *st = st_data[unit];
/*******************************************************\
* If we're at beginning of medium, now is the time to *
* set medium access density, fixed or variable-blocks *
* and, if fixed, the block size. *
\*******************************************************/
if (st->flags & ST_AT_BOM &&
(error = st_decide_mode(unit, TRUE)))
return (error);
switch (what)
{
case SP_BLKS:
if (st->flags & ST_PER_ACTION)
{
if (number > 0)
{
st->flags &= ~ST_PER_ACTION;
return(EIO);
}
else if (number < 0)
{
if (st->flags & ST_AT_FILEMARK)
{
/*******************************\
* Handling of ST_AT_FILEMARK *
* in st_space will fill in the *
* right file mark count. *
\*******************************/
error = st_space(unit, 0, SP_FILEMARKS,
flags);
if (error) return(error);
}
if (st->flags & ST_BLANK_READ)
{
st->flags &= ~ST_BLANK_READ;
return(EIO);
}
st->flags &= ~ST_EIO_PENDING;
}
}
break;
case SP_FILEMARKS:
if (st->flags & ST_EIO_PENDING)
{
if (number > 0)
{
st->flags &= ~ST_EIO_PENDING;
return(EIO);
}
else if (number < 0)
st->flags &= ~ST_EIO_PENDING;
}
if (st->flags & ST_AT_FILEMARK)
{
st->flags &= ~ST_AT_FILEMARK;
number--;
}
if (st->flags & ST_BLANK_READ && number < 0)
{
st->flags &= ~ST_BLANK_READ;
number++;
}
}
if (number == 0)
return(ESUCCESS);
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = SPACE;
scsi_cmd.byte2 = what & SS_CODE;
lto3b(number,scsi_cmd.number);
return (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
0,
0,
600000, /* 10 mins enough? */
NULL,
flags));
}
/*******************************************************\
* write N filemarks *
\*******************************************************/
st_write_filemarks(unit,number,flags)
int unit,number,flags;
{
int error;
struct scsi_write_filemarks scsi_cmd;
struct st_data *st = st_data[unit];
/*******************************************************\
* It's hard to write a negative number of file marks. *
* Don't try. *
\*******************************************************/
if (number < 0)
return (EINVAL);
/*******************************************************\
* If we're at beginning of medium, now is the time to *
* set medium access density, fixed or variable-blocks *
* and, if fixed, the block size. *
\*******************************************************/
if (st->flags & ST_AT_BOM && number > 0 &&
(error = st_decide_mode(unit, FALSE)))
return (error);
switch (number)
{
case 0: /* really a command to sync the drive's buffers */
break;
case 1:
if (st->flags & ST_FM_WRITTEN)
st->flags &= ~ST_WRITTEN;
else
st->flags |= ST_FM_WRITTEN;
st->flags &= ~ST_PER_ACTION;
break;
default:
st->flags &= ~(ST_PER_ACTION | ST_WRITTEN);
}
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = WRITE_FILEMARKS;
lto3b(number,scsi_cmd.number);
return (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
0,
0,
100000, /* 10 secs.. (may need to repos head )*/
NULL,
flags) );
}
/***************************************************************\
* Make sure the right number of file marks is on tape if the *
* tape has been written. If the position argument is true, *
* leave the tape positioned where it was originally. *
* *
* nmarks returns the number of marks to skip (or, if position *
* true, which were skipped) to get back original position. *
\***************************************************************/
st_chkeod(unit, position, nmarks, flags)
int unit;
int position;
int *nmarks;
int flags;
{
int error;
struct st_data *st = st_data[unit];
switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD))
{
default:
*nmarks = 0;
return(ESUCCESS);
case ST_WRITTEN:
case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD:
*nmarks = 1;
break;
case ST_WRITTEN | ST_2FM_AT_EOD:
*nmarks = 2;
}
error = st_write_filemarks(unit, *nmarks, flags);
if (position && error == ESUCCESS)
error = st_space(unit, -*nmarks, SP_FILEMARKS, flags);
return (error);
}
/*******************************************************\
* load/unload (with retension if true) *
\*******************************************************/
st_load(unit,type,flags)
int unit,type,flags;
{
struct scsi_load scsi_cmd;
struct st_data *st = st_data[unit];
st->flags &= ~ST_PER_MEDIA;
bzero(&scsi_cmd, sizeof(scsi_cmd));
if (type == LD_LOAD)
{
/*scsi_cmd.how |= LD_RETEN;*/
st->flags |= ST_AT_BOM;
}
else
{
int error, nmarks;
error = st_chkeod(unit, FALSE, &nmarks, flags);
if (error != ESUCCESS) return(error);
st->flags &= ~ST_INFO_VALID;
}
if(st->quirks & ST_Q_IGNORE_LOADS) return(0);
scsi_cmd.op_code = LOAD_UNLOAD;
scsi_cmd.how |= type;
return (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
0,
0,
300000, /* 5 min */
NULL,
flags));
}
/*******************************************************\
* Prevent or allow the user to remove the tape *
\*******************************************************/
st_prevent(unit,type,flags)
int unit,type,flags;
{
struct scsi_prevent scsi_cmd;
if (type == PR_ALLOW)
{
int error, nmarks;
error = st_chkeod(unit, TRUE, &nmarks, flags);
if (error != ESUCCESS) return(error);
st_data[unit]->flags &= ~ST_INFO_VALID;
}
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = PREVENT_ALLOW;
scsi_cmd.how=type;
return (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
0,
0,
5000,
NULL,
flags));
}
/*******************************************************\
* Rewind the device *
\*******************************************************/
st_rewind(unit,immed,flags)
int unit,immed,flags;
{
struct scsi_rewind scsi_cmd;
struct st_data *st = st_data[unit];
int error, nmarks;
error = st_chkeod(unit, FALSE, &nmarks, flags);
if (error != ESUCCESS) return(error);
st->flags &= ~ST_PER_ACTION;
st->flags |= ST_AT_BOM;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = REWIND;
scsi_cmd.byte2 = immed ? SR_IMMED : 0;
return (st_scsi_cmd(unit,
&scsi_cmd,
sizeof(scsi_cmd),
0,
0,
immed?5000:300000, /* 5 sec or 5 min */
NULL,
flags));
}
/***************************************************************\
* 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_rw_tape cmd;
int blkno, nblk;
struct st_data *st = st_data[unit];
int flags;
#ifdef STDEBUG
if(scsi_debug & PRINTROUTINES) printf("ststart%d ",unit);
#endif /*STDEBUG*/
/*******************************************************\
* See if there is a buf to do and we are not already *
* doing one *
\*******************************************************/
if(st->scsi_xfer.flags & INUSE)
{
return; /* unit already underway */
}
trynext:
if(st->xfer_block_wait) /* a special awaits, let it proceed first */
{
wakeup(&(st->xfer_block_wait));
return;
}
if ((bp = st->buf_queue) == NULL)
{
return; /* no work to bother with */
}
st->buf_queue = bp->b_actf;
/*******************************************************\
* only FIXEDBLOCK devices have pending operations *
\*******************************************************/
if(st->flags & ST_FIXEDBLOCKS)
{
/*******************************************************\
* If we are at a filemark but have not reported it yet *
* then we should report it now *
\*******************************************************/
if(st->flags & ST_AT_FILEMARK)
{
if ((bp->b_flags & B_READ) == B_WRITE)
{
/***************************************\
* Handling of ST_AT_FILEMARK in *
* st_space will fill in the right file *
* mark count. *
\***************************************/
if (st_space(unit, 0, SP_FILEMARKS, 0) !=
ESUCCESS) goto badnews;
}
else
{
bp->b_resid = bp->b_bcount;
bp->b_error = 0;
bp->b_flags &= ~B_ERROR;
st->flags &= ~ST_AT_FILEMARK;
biodone(bp);
goto trynext;
}
}
/*******************************************************\
* If we are at EIO (e.g. EOM) but have not reported it *
* yet then we should report it now *
\*******************************************************/
if(st->flags & ST_EIO_PENDING)
{
bp->b_resid = bp->b_bcount;
bp->b_error = EIO;
bp->b_flags |= B_ERROR;
st->flags &= ~ST_EIO_PENDING;
biodone(bp);
goto trynext;
}
}
/*******************************************************\
* Fill out the scsi command *
\*******************************************************/
bzero(&cmd, sizeof(cmd));
if((bp->b_flags & B_READ) == B_WRITE)
{
cmd.op_code = WRITE_COMMAND_TAPE;
st->flags &= ~ST_FM_WRITTEN;
st->flags |= ST_WRITTEN;
flags = SCSI_DATA_OUT;
}
else
{
cmd.op_code = READ_COMMAND_TAPE;
flags = SCSI_DATA_IN;
}
/*******************************************************\
* Handle "fixed-block-mode" tape drives by using the *
* block count instead of the length. *
\*******************************************************/
if(st->flags & ST_FIXEDBLOCKS)
{
cmd.byte2 |= SRWT_FIXED;
lto3b(bp->b_bcount/st->blksiz,cmd.len);
}
else
{
lto3b(bp->b_bcount,cmd.len);
}
/*******************************************************\
* go ask the adapter to do all this for us *
\*******************************************************/
if (st_scsi_cmd(unit,
&cmd,
sizeof(cmd),
(u_char *)bp->b_un.b_addr,
bp->b_bcount,
100000,
bp,
flags | SCSI_NOSLEEP ) != SUCCESSFULLY_QUEUED)
{
badnews:
printf("st%d: oops not queued\n",unit);
bp->b_flags |= B_ERROR;
bp->b_error = EIO;
biodone(bp);
return;
}
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;
struct st_data *st = st_data[unit];
#ifdef STDEBUG
if(scsi_debug & PRINTROUTINES) printf("st_done%d ",unit);
#endif /*STDEBUG*/
#ifdef PARANOID
if (! (xs->flags & INUSE))
panic("scsi_xfer not in use!");
#endif /*PARANOID*/
if((bp = xs->bp)== NULL)
{
wakeup(xs);
return;
}
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));
bp->b_resid = xs->resid; /* already multiplied by blksiz */
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 *
* All status is now suspect *
\***************************************/
bp->b_flags |= B_ERROR;
bp->b_error = retval;
bp->b_resid = bp->b_bcount;
st->flags &= ~ST_PER_ACTION;
}
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 == 0)
{
/***************************************\
* we apparently had a corrected error *
* or something. *
* pretend the error never happenned *
\***************************************/
bp->b_flags &= ~B_ERROR;
bp->b_error = 0;
break;
}
if ( 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 NetBSD: *
* 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) *
* *
*-------for fixed blocksize device------*
* We read some successful records *
* before hitting the EOF or EOT. These *
* must be passed to the user, before we *
* report the EOx. We will report the *
* EOx NEXT time. *
\***************************************/
#ifdef NETBSD
bp->b_flags &= ~B_ERROR;
#else
bp->b_flags |= B_ERROR;
#endif
bp->b_error = 0;
xs->error = XS_NOERROR;
break;
}
else
{
/***************************************\
* We have come out of the error handler *
* with no error code. We have also not *
* transferred any data (would have gone *
* to the previous clause). *
* This must be an EOF *
* Any caller request to read no *
* data would have been short-circuited *
* at st_read or ststrategy. *
* *
* At least all o/s agree that: *
* 0 bytes read with no error is EOF *
\***************************************/
bp->b_error = 0;
bp->b_flags &= ~B_ERROR;
st->flags &= ~ST_AT_FILEMARK;
break;
}
}
break;
case XS_TIMEOUT:
printf("st%d: timeout\n",unit);
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->sc_sw->scsi_cmd))(xs)
== SUCCESSFULLY_QUEUED)
{ /* don't wake the job, ok? */
return;
}
printf("st%d: device busy\n",unit);
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 */
}
/*******************************************************\
* 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,bp,flags)
int unit,flags;
struct scsi_generic *scsi_cmd;
int cmdlen;
int timeout;
u_char *data_addr;
struct buf *bp;
int datalen;
{
struct scsi_xfer *xs;
int retval;
int s;
struct st_data *st = st_data[unit];
#ifdef STDEBUG
if(scsi_debug & PRINTROUTINES) printf("\nst_scsi_cmd%d ",unit);
#endif /*STDEBUG*/
#ifdef PARANOID
if(st->sc_sw == NULL) /* If we have no scsi driver */
{
printf("st%d: not set up\n",unit);
return(EINVAL);
}
#endif /*PARANOID*/
xs = &(st->scsi_xfer);
if(!(flags & SCSI_NOMASK))
s = splbio();
st->xfer_block_wait++; /* there is someone waiting */
while (xs->flags & INUSE)
{
if(flags & SCSI_NOSLEEP)
return EBUSY;
sleep(&(st->xfer_block_wait),PRIBIO+1);
}
st->xfer_block_wait--;
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 = bp?0:ST_RETRIES;/*can't retry on IO*/
xs->timeout = timeout;
xs->cmd = scsi_cmd;
xs->cmdlen = cmdlen;
xs->data = data_addr;
xs->datalen = datalen;
xs->resid = datalen;
xs->when_done = st_done;
xs->done_arg = unit;
xs->done_arg2 = (int)xs;
xs->bp = bp;
retry: xs->error = XS_NOERROR;
/***********************************************\
* Ask the adapter to do the command for us *
\***********************************************/
retval = (*(st->sc_sw->scsi_cmd))(xs);
/***********************************************\
* IO operations are handled differently.. *
* Physio does the sleep, and error handling is *
* Done in st_done at interrupt time *
\***********************************************/
if(bp) return retval;
/***********************************************\
* Wait for the result if queued, or handle the *
* error if it was rejected.. *
\***********************************************/
switch(retval)
{
case SUCCESSFULLY_QUEUED:
s = splbio();
while(!(xs->flags & ITSDONE))
sleep(xs,PRIBIO+1);
splx(s);
/*******************************\
* finished.. check for failure *
* Fall through...... *
\*******************************/
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 *//* why did I say that?*/
if (retval)
{ /* error... don't care about filemarks */
st->flags &= ~ST_PER_ACTION;
}
else
{
xs->error = XS_NOERROR;
retval = ESUCCESS;
}
break;
case XS_DRIVER_STUFFUP:
retval = EIO;
break;
case XS_BUSY:
/* should sleep 1 sec here */
case XS_TIMEOUT:
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;
/* should delay here */
goto retry;
}
retval = EIO;
break;
default:
retval = EIO;
}
xs->flags = 0; /* it's free! */
ststart(unit);
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;
struct st_data *st = st_data[unit];
int info;
static char *error_mes[] = { "soft error (corrected)",
"not ready", "medium error",
"non-media hardware failure", "illegal request",
"unit attention", "tape is write-protected",
"no data found", "vendor unique",
"copy aborted", "command aborted",
"search returned equal", "volume overflow",
"verify miscompare", "unknown error key"
};
/***************************************************************\
* If errors are ok, report a success *
\***************************************************************/
if(xs->flags & SCSI_ERR_OK) return(ESUCCESS);
/***************************************************************\
* Get the sense fields and work out what code *
\***************************************************************/
sense = &(xs->sense);
#ifdef STDEBUG
if(st_debug)
{
int count = 0;
printf("code%x valid%x\n"
,sense->error_code & SSD_ERRCODE
,sense->error_code & SSD_ERRCODE_VALID ? 1 : 0);
printf("seg%x key%x ili%x eom%x fmark%x\n"
,sense->ext.extended.segment
,sense->ext.extended.flags & SSD_KEY
,sense->ext.extended.flags & SSD_ILI ? 1 : 0
,sense->ext.extended.flags & SSD_EOM ? 1 : 0
,sense->ext.extended.flags & SSD_FILEMARK ? 1 : 0);
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");
}
#endif /*STDEBUG*/
if(sense->error_code & SSD_ERRCODE_VALID)
{
info = ntohl(*((long *)sense->ext.extended.info));
}
else
{
info = xs->datalen; /* bad choice if fixed blocks */
}
switch(sense->error_code & SSD_ERRCODE)
{
/***************************************************************\
* If it's code 70, use the extended stuff and interpret the key *
\***************************************************************/
case 0x70:
if(st->flags & ST_FIXEDBLOCKS)
{
xs->resid = info * st->blksiz;
if(sense->ext.extended.flags & SSD_EOM)
{
st->flags |= ST_EIO_PENDING;
}
if(sense->ext.extended.flags & SSD_FILEMARK)
{
st->flags |= ST_AT_FILEMARK;
}
if(sense->ext.extended.flags & SSD_ILI)
{
st->flags |= ST_EIO_PENDING;
if (sense->error_code & SSD_ERRCODE_VALID &&
!silent)
printf("st%d: %d-byte block wrong size"
"\n", unit, xs->datalen - info);
/***************************************\
* This quirk code helps the drive read *
* the first tape block, regardless of *
* format. That is required for these *
* drives to return proper MODE SENSE *
* information. *
\***************************************/
if ((st->quirks & ST_Q_SNS_HLP) &&
!(st->flags & ST_INFO_VALID))
{
st->blksiz -= 512;
}
}
/***********************************************\
* If no data was tranfered, do it immediatly *
\***********************************************/
if(xs->resid >= xs->datalen)
{
if(st->flags & ST_EIO_PENDING)
{
return EIO;
}
if(st->flags & ST_AT_FILEMARK)
{
return 0;
}
}
}
else
{
xs->resid = xs->datalen; /* to be sure */
if(sense->ext.extended.flags & SSD_EOM)
{
return(EIO);
}
if(sense->ext.extended.flags & SSD_FILEMARK)
{
return 0;
}
if(sense->ext.extended.flags & SSD_ILI)
{
if(info < 0)
/***************************************\
* the record was bigger than the read *
\***************************************/
{
if (!silent)
printf("st%d: %d-byte record "
"too big\n", unit,
xs->datalen - info);
return(EIO);
}
xs->resid = info;
}
}/* there may be some other error. check the rest */
key=sense->ext.extended.flags & SSD_KEY;
if (!silent && key > 0 && (key != 0x8 ||
st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ)))
{
printf("st%d: %s", unit, error_mes[key - 1]);
if(sense->error_code & SSD_ERRCODE_VALID)
{
switch (key)
{
case 0x2: /* NOT READY */
case 0x5: /* ILLEGAL REQUEST */
case 0x6: /* UNIT ATTENTION */
case 0x7: /* DATA PROTECT */
break;
case 0x8: /* BLANK CHECK */
printf(", requested size: %d (decimal)",
info);
break;
default:
printf(", info = %d (decimal)", info);
}
}
printf("\n");
}
switch (key)
{
case 0x0: /* NO SENSE */
case 0x1: /* RECOVERED ERROR */
if(xs->resid == xs->datalen) xs->resid = 0;
case 0xc: /* EQUAL */
return(ESUCCESS);
case 0x2: /* NOT READY */
return(ENODEV);
case 0x5: /* ILLEGAL REQUEST */
return(EINVAL);
case 0x6: /* UNIT ATTENTION */
st->flags &= ~ST_PER_MEDIA;
if (st->flags & ST_OPEN) /* TEMP!!!! */
return(EIO);
else
return(ESUCCESS);
case 0x7: /* DATA PROTECT */
return(EACCES);
case 0xd: /* VOLUME OVERFLOW */
return(ENOSPC);
case 0x8: /* BLANK CHECK */
/***********************************************\
* This quirk code helps the drive read the *
* first tape block, regardless of format. That *
* is required for these drives to return proper *
* MODE SENSE information. *
\***********************************************/
if ((st->quirks & ST_Q_SNS_HLP) &&
!(st->flags & ST_INFO_VALID))
{
st->blksiz -= 512;
}
else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ)))
{
st->flags |= ST_BLANK_READ;
xs->resid = xs->datalen;
return(ESUCCESS);
}
default:
return(EIO);
}
/***************************************************************\
* If it's NOT code 70, just report it. *
\***************************************************************/
default:
if (!silent)
{
printf("st%d: error code %d", unit,
sense->error_code & SSD_ERRCODE);
if(sense->error_code & SSD_ERRCODE_VALID)
{
printf(" at block no. %d (decimal)",
(sense->ext.unextended.blockhi << 16) +
(sense->ext.unextended.blockmed << 8) +
sense->ext.unextended.blocklow);
}
printf("\n");
}
return(EIO);
}
}
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