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freebsd-nq/sys/scsi/st.c
Poul-Henning Kamp cba8a5ddd3 Make a "DWIM" function for adding [bc]devsw entries for bdev drivers. 
Saves about 280 butes of source per driver, 56 bytes in object size
and another 56 bytes moves from data to bss.

No functional change intended nor expected.

GENERIC should be about one k smaller now :-)
1996-07-23 21:52:43 +00:00

1994 lines
51 KiB
C
Raw Blame History

/*
* 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.
*
* $Id: st.c,v 1.71 1996/07/14 10:46:54 joerg Exp $
*/
/*
* 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
*/
/*
* 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 "opt_bounce.h"
#include "opt_scsi.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/fcntl.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/mtio.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /*DEVFS*/
#include <scsi/scsi_all.h>
#include <scsi/scsi_tape.h>
#include <scsi/scsiconf.h>
#include <sys/devconf.h>
/* Defines for device specific stuff */
#define PAGE_0_SENSE_DATA_SIZE 12
#define DEF_FIXED_BSIZE 512
#define ST_RETRIES 4 /* only on non IO commands */
#define STUNIT(DEV) ((minor(DEV)&0xF0) >> 4) /* 4 bit unit. */
#define STSETUNIT(DEV, U) makedev(major(DEV), ((U) << 4))
#define MODE(z) ( (minor(z) & 0x03) )
#define DSTY(z) ( ((minor(z) >> 2) & 0x03) )
#define CTLMODE 3
#define IS_CTLMODE(DEV) (MODE(DEV) == CTLMODE)
static errval st_space __P((u_int32_t unit, int32_t number, u_int32_t what, u_int32_t flags));
static errval st_rewind __P((u_int32_t unit, boolean immed, u_int32_t flags));
static errval st_erase __P((u_int32_t unit, boolean immed, u_int32_t flags));
static errval st_mode_sense __P((u_int32_t unit, u_int32_t flags, \
struct tape_pages *page, u_int32_t pagelen, u_int32_t pagecode));
static errval st_decide_mode __P((u_int32_t unit, boolean first_read));
static errval st_read __P((u_int32_t unit, char *buf, u_int32_t size,
u_int32_t flags));
static errval st_rd_blk_lim __P((u_int32_t unit, u_int32_t flags));
static errval st_touch_tape __P((u_int32_t unit));
static errval st_write_filemarks __P((u_int32_t unit, int32_t number, u_int32_t flags));
static errval st_load __P((u_int32_t unit, u_int32_t type, u_int32_t flags));
static errval st_mode_select __P((u_int32_t unit, u_int32_t flags, \
struct tape_pages *page, u_int32_t pagelen));
static errval st_comp __P((u_int32_t unit, u_int32_t mode));
static int32_t st_chkeod __P((u_int32_t unit, boolean position, int32_t *nmarks,
u_int32_t flags));
static void ststart(u_int32_t unit, u_int32_t flags);
static void st_unmount __P((int unit, boolean eject));
static errval st_mount_tape __P((dev_t dev, u_int32_t flags));
static void st_loadquirks __P((struct scsi_link *sc_link));
static errval st_interpret_sense __P((struct scsi_xfer *xs));
#define ESUCCESS 0
#define NOEJECT 0
#define EJECT 1
struct scsi_data {
/*--------------------present operating parameters, flags etc.----------------*/
u_int32_t flags; /* see below */
u_int32_t blksiz; /* blksiz we are using */
u_int32_t density; /* present density */
u_int32_t comp; /* present compression mode */
u_int32_t quirks; /* quirks for the open mode */
u_int32_t last_dsty; /* last density openned */
/*--------------------parameters reported by the device ----------------------*/
u_int32_t blkmin; /* min blk size */
u_int32_t blkmax; /* max blk size */
/*--------------------parameters reported by the device for this media--------*/
u_int32_t numblks; /* nominal blocks capacity */
u_int32_t media_blksiz; /* 0 if not ST_FIXEDBLOCKS */
u_int32_t media_density; /* this is what it said when asked */
/*--------------------quirks for the whole drive------------------------------*/
u_int32_t drive_quirks; /* quirks of this drive */
/*--------------------How we should set up when openning each minor device----*/
st_modes modes; /* plus more for each mode */
u_int8_t modeflags[4]; /* flags for the modes */
#define DENSITY_SET_BY_USER 0x01
#define DENSITY_SET_BY_QUIRK 0x02
#define BLKSIZE_SET_BY_USER 0x04
#define BLKSIZE_SET_BY_QUIRK 0x08
#define COMPRES_SET_BY_USER 0x10
#define COMPRES_SET_BY_QUIRK 0x20
/*--------------------storage for sense data returned by the drive------------*/
unsigned char saved_page0[PAGE_0_SENSE_DATA_SIZE]; /*
* additional sense data needed
* for mode sense/select.
*/
struct buf_queue_head buf_queue;
struct scsi_xfer scsi_xfer; /* scsi xfer struct for this drive */
u_int32_t xfer_block_wait; /* is a process waiting? */
#ifdef DEVFS
struct {
void *rst;
void *nrst;
void *erst;
/* end of aliases */
void *rst_[4];
void *nrst_[4];
void *erst_[4];
void *ctl_[4];
void *ctl;
} devfs_token;
#endif
};
static int stunit(dev_t dev) { return STUNIT(dev); }
static dev_t stsetunit(dev_t dev, int unit) { return STSETUNIT(dev, unit); }
static errval st_open(dev_t dev, int flags, int fmt, struct proc *p,
struct scsi_link *sc_link);
static errval st_ioctl(dev_t dev, int cmd, caddr_t addr, int flag,
struct proc *p, struct scsi_link *sc_link);
static errval st_close(dev_t dev, int flag, int fmt, struct proc *p,
struct scsi_link *sc_link);
static void st_strategy(struct buf *bp, struct scsi_link *sc_link);
static d_open_t stopen;
static d_close_t stclose;
static d_ioctl_t stioctl;
static d_strategy_t ststrategy;
#define CDEV_MAJOR 14
#define BDEV_MAJOR 5
static struct cdevsw st_cdevsw;
static struct bdevsw st_bdevsw =
{ stopen, stclose, ststrategy, stioctl, /*5*/
nodump, nopsize, 0, "st", &st_cdevsw, -1 };
SCSI_DEVICE_ENTRIES(st)
static struct scsi_device st_switch =
{
st_interpret_sense, /* check errors with us first */
ststart, /* we have a queue, and this is how we service it */
NULL,
NULL, /* use the default 'done' routine */
"st",
0,
{0, 0},
0, /* Link flags */
stattach,
"Sequential-Access",
stopen,
sizeof(struct scsi_data),
T_SEQUENTIAL,
stunit,
stsetunit,
st_open,
st_ioctl,
st_close,
st_strategy,
};
#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_NEW_MOUNT 0x100 /* still need to decide mode */
#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_MOUNTED 0x2000 /* Device is presently mounted */
#define ST_SENSE_READ 0x4000 /* mode sense read from drive */
#define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ)
#define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \
ST_FIXEDBLOCKS | ST_READONLY | \
ST_FM_WRITTEN | ST_2FM_AT_EOD | ST_PER_ACTION)
static int
st_externalize(struct kern_devconf *kdc, struct sysctl_req *req)
{
return scsi_externalize(SCSI_LINK(&st_switch, kdc->kdc_unit), req);
}
static struct kern_devconf kdc_st_template = {
0, 0, 0, /* filled in by dev_attach */
"st", 0, MDDC_SCSI,
st_externalize, 0, scsi_goaway, SCSI_EXTERNALLEN,
&kdc_scbus0, /* XXX parent */
0, /* parentdata */
DC_UNKNOWN, /* not supported */
};
static inline void
st_registerdev(int unit)
{
struct kern_devconf *kdc;
MALLOC(kdc, struct kern_devconf *, sizeof *kdc, M_TEMP, M_NOWAIT);
if(!kdc) return;
*kdc = kdc_st_template;
kdc->kdc_unit = unit;
kdc->kdc_description = st_switch.desc;
dev_attach(kdc);
}
/*
* The routine called by the low level scsi routine when it discovers
* a device suitable for this driver
*/
static errval
stattach(struct scsi_link *sc_link)
{
u_int32_t unit;
#ifdef DEVFS
int ii;
#endif /*DEVFS*/
struct scsi_data *st = sc_link->sd;
unit = sc_link->dev_unit;
TAILQ_INIT(&st->buf_queue);
/*
* Check if the drive is a known criminal and take
* Any steps needed to bring it into line
*/
st_loadquirks(sc_link);
/*
* 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,
NULL, 0, 0)) {
printf("drive offline");
} else {
printf("density code 0x%lx, ", st->media_density);
if (!scsi_test_unit_ready(sc_link, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT)) {
if (st->media_blksiz) {
printf("%ld-byte", st->media_blksiz);
} else {
printf("variable");
}
printf(" blocks, write-%s",
(st->flags & ST_READONLY) ? "protected" : "enabled");
} else {
printf(" drive empty");
}
}
/*
* Set up the buf queue for this device
*/
st->flags |= ST_INITIALIZED;
st_registerdev(unit);
#ifdef DEVFS
for(ii=0; ii<4; ii++) {
st->devfs_token.rst_[ii] =
devfs_add_devswf(&st_cdevsw,
(unit << 4 ) + (ii * 4), DV_CHR,
UID_ROOT, GID_OPERATOR, 0660,
"rst%ld.%d", unit, ii);
st->devfs_token.nrst_[ii] =
devfs_add_devswf(&st_cdevsw,
(unit << 4 ) + ((ii * 4) + 1), DV_CHR,
UID_ROOT, GID_OPERATOR, 0660,
"nrst%ld.%d", unit, ii);
st->devfs_token.erst_[ii] =
devfs_add_devswf(&st_cdevsw,
(unit << 4 ) + ((ii * 4) + 2), DV_CHR,
UID_ROOT, GID_OPERATOR, 0660,
"erst%ld.%d", unit, ii);
st->devfs_token.ctl_[ii] =
devfs_add_devswf(&st_cdevsw,
(unit << 4 ) + ((ii * 4) + 3), DV_CHR,
UID_ROOT, GID_OPERATOR, 0600,
"st%ldctl.%d", unit, ii);
}
st->devfs_token.ctl =
devfs_add_devswf(&st_cdevsw, (unit << 4 ) | SCSI_CONTROL_MASK,
DV_CHR, UID_ROOT, GID_WHEEL, 0600,
"rst%d.ctl", unit);
/** add links **/
st->devfs_token.rst =
devfs_link(st->devfs_token.rst_[0], "rst%ld", unit);
st->devfs_token.nrst =
devfs_link(st->devfs_token.nrst_[0], "nrst%ld", unit);
st->devfs_token.erst =
devfs_link(st->devfs_token.erst_[0], "erst%ld", unit);
#endif
return 0;
}
/*
* initialise the subdevices to the default (QUIRK) state.
* this will remove any setting made by the system operator or previous
* operations.
*/
static void
st_loadquirks(sc_link)
struct scsi_link *sc_link;
{
struct scsi_data *st = sc_link->sd;
int i;
struct st_mode *mode;
struct st_mode *mode2;
mode = (struct st_mode*) sc_link->devmodes;
if (!mode)
return;
st->quirks = st->drive_quirks = sc_link->quirks;
mode2 = st->modes;
for (i = 0; i < 4; i++) {
bzero(mode2, sizeof(*mode2));
st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK
| DENSITY_SET_BY_QUIRK
| BLKSIZE_SET_BY_USER
| DENSITY_SET_BY_USER);
if (mode->blksiz && ((mode->quirks | st->drive_quirks)
& (ST_Q_FORCE_FIXED_MODE))) {
mode2->blksiz = mode->blksiz;
st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK;
} else {
if ((mode->quirks | st->drive_quirks)
& ST_Q_FORCE_VAR_MODE) {
mode2->blksiz = 0;
st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK;
}
}
if (mode->density) {
mode2->density = mode->density;
st->modeflags[i] |= DENSITY_SET_BY_QUIRK;
}
mode++;
mode2++;
}
}
/*
* open the device.
*/
static errval
st_open(dev_t dev, int flags, int fmt, struct proc *p,
struct scsi_link *sc_link)
{
u_int32_t unit, mode, dsty;
errval errno = 0;
struct scsi_data *st;
unit = STUNIT(dev);
mode = MODE(dev);
dsty = DSTY(dev);
st = sc_link->sd;
/*
* 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 (EBUSY);
}
/*
* 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)
*/
scsi_test_unit_ready(sc_link, SCSI_SILENT);
sc_link->flags |= SDEV_OPEN; /* unit attn are now errors */
/*
* If the mode is 3 (e.g. minor = 3,7,11,15)
* then the device has been openned to set defaults
* This mode does NOT ALLOW I/O, only ioctls.
* XXX: Where do we lock out I/O?
*/
if (IS_CTLMODE(dev))
return 0;
/*
* Check that the device is ready to use (media loaded?)
* This time take notice of the return result
*/
if ( (errno = scsi_test_unit_ready(sc_link, 0)) ) {
uprintf("st%d: not ready\n", unit);
st_unmount(unit, NOEJECT);
return (errno);
}
/*
* if it's a different mode, or if the media has been
* invalidated, unmount the tape from the previous
* session but continue with open processing
*/
if ((st->last_dsty != dsty)
|| (!(sc_link->flags & SDEV_MEDIA_LOADED))) {
st_unmount(unit, NOEJECT);
}
/*
* If we are not mounted, then we should start a new
* mount session.
*/
if (!(st->flags & ST_MOUNTED)) {
st_mount_tape(dev, flags);
st->last_dsty = dsty;
}
/*
* Make sure that a tape opened in write-only mode will have
* file marks written on it when closed, even if not written to.
* This is for SUN compatibility
*/
if ((flags & O_ACCMODE) == FWRITE)
st->flags |= ST_WRITTEN;
scsi_prevent(sc_link, PR_PREVENT, 0); /* who cares if it fails? */
SC_DEBUG(sc_link, SDEV_DB2, ("Open complete\n"));
st->flags |= ST_OPEN;
return 0;
}
/*
* close the device.. only called if we are the LAST
* occurence of an open device
*/
static errval
st_close(dev_t dev, int flag, int fmt, struct proc *p,
struct scsi_link *sc_link)
{
u_int32_t unit, mode;
struct scsi_data *st;
unit = STUNIT(dev);
mode = MODE(dev);
st = sc_link->sd;
if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN)
st_write_filemarks(unit, 1, 0);
/*
* Since the device has seen its last close, allow media removal.
* Do this before we attempt an eject.
*/
scsi_prevent(sc_link, PR_ALLOW, SCSI_SILENT);
switch (mode & 0x3) {
case 0:
case 3: /* for now */
st_unmount(unit, NOEJECT);
break;
case 1: /*leave mounted unless media seems to have been removed */
if (!(sc_link->flags & SDEV_MEDIA_LOADED)) {
st_unmount(unit, NOEJECT);
}
break;
case 2:
st_unmount(unit, EJECT);
break;
}
sc_link->flags &= ~SDEV_OPEN;
st->flags &= ~ST_OPEN;
return (0);
}
/*
* Start a new mount session.
* Copy in all the default parameters from the selected device mode.
* and try guess any that seem to be defaulted.
*/
static errval
st_mount_tape(dev, flags)
dev_t dev;
u_int32_t flags;
{
u_int32_t unit, mode, dsty;
struct scsi_data *st;
struct scsi_link *sc_link;
errval errno = 0;
unit = STUNIT(dev);
mode = MODE(dev);
dsty = DSTY(dev);
sc_link = SCSI_LINK(&st_switch, unit);
st = sc_link->sd;
if (st->flags & ST_MOUNTED)
return 0;
SC_DEBUG(sc_link, SDEV_DB1, ("mounting\n "));
st->flags |= ST_NEW_MOUNT;
st->quirks = st->drive_quirks | st->modes[dsty].quirks;
/*
* If the media is new, then make sure we give it a chance to
* to do a 'load' instruction. ( We assume it is new)
*/
if ( (errno = st_load(unit, LD_LOAD, 0)) ) {
return (errno);
}
/*
* Throw another dummy instruction to catch
* 'Unit attention' errors. Some drives appear to give
* these after doing a Load instruction.
* (noteably some DAT drives)
*/
scsi_test_unit_ready(sc_link, SCSI_SILENT);
/*
* Some devices can't tell you much until they have been
* asked to look at the media. This quirk does this.
*/
if (st->quirks & ST_Q_SNS_HLP) {
if ( (errno = st_touch_tape(unit)) )
return errno;
}
/*
* 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
* As we have a tape in, it should be reflected here.
* If not you may need the "quirk" above.
*/
if ( (errno = st_mode_sense(unit, 0, NULL, 0, 0)) ) {
return errno;
}
/*
* If we have gained a permanent density from somewhere,
* then use it in preference to the one supplied by
* default by the driver.
*/
if (st->modeflags[dsty] & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER)) {
st->density = st->modes[dsty].density;
} else {
st->density = st->media_density;
}
/*
* If we have gained a permanent blocksize
* then use it in preference to the one supplied by
* default by the driver.
*/
st->flags &= ~ST_FIXEDBLOCKS;
if (st->modeflags[dsty] & (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) {
st->blksiz = st->modes[dsty].blksiz;
if (st->blksiz) {
st->flags |= ST_FIXEDBLOCKS;
}
} else {
if ( (errno = st_decide_mode(unit, FALSE)) ) {
return errno;
}
}
if ( (errno = st_mode_select(unit, 0, NULL, 0)) ) {
printf("st%ld: Cannot set selected mode", unit);
return errno;
}
st->flags &= ~ST_NEW_MOUNT;
st->flags |= ST_MOUNTED;
sc_link->flags |= SDEV_MEDIA_LOADED;
return 0;
}
/*
* End the present mount session.
* Rewind, and optionally eject the tape.
* Reset various flags to indicate that all new
* operations require another mount operation
*/
void
st_unmount(int unit, boolean eject)
{
struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit);
struct scsi_data *st = sc_link->sd;
int32_t nmarks;
if (!(st->flags & ST_MOUNTED))
return;
SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n"));
st_chkeod(unit, FALSE, &nmarks, SCSI_SILENT);
st_rewind(unit, FALSE, SCSI_SILENT);
if (eject) {
st_load(unit, LD_UNLOAD, SCSI_SILENT);
}
st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT);
sc_link->flags &= ~SDEV_MEDIA_LOADED;
}
/*
* Given all we know about the device, media, mode, 'quirks' and
* initial operation, make a decision as to how we should be set
* to run (regarding blocking and EOD marks)
*/
static errval
st_decide_mode(unit, first_read)
u_int32_t unit;
boolean first_read;
{
struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit);
struct scsi_data *st = sc_link->sd;
SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n"));
/*
* 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 ((int)(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%ld: bad quirks\n", unit);
return (EINVAL);
case ST_Q_FORCE_FIXED_MODE: /*specified fixed, but not what size */
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;
SC_DEBUG(sc_link, SDEV_DB3, ("Quirks force fixed mode(%ld)\n",
st->blksiz));
goto done;
case ST_Q_FORCE_VAR_MODE:
st->flags &= ~ST_FIXEDBLOCKS;
st->blksiz = 0;
SC_DEBUG(sc_link, SDEV_DB3, ("Quirks force variable mode\n"));
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;
SC_DEBUG(sc_link, SDEV_DB3,
("blkmin == blkmax of %ld\n", st->blkmin));
goto done;
}
/*
* If the tape density mandates (or even suggests) use of fixed
* or variable-length blocks, comply.
*/
switch ((int)st->density) {
case HALFINCH_800:
case HALFINCH_1600:
case HALFINCH_6250:
case DDS:
case QIC_525:
case QIC_1320:
case QIC_3080:
st->flags &= ~ST_FIXEDBLOCKS;
st->blksiz = 0;
SC_DEBUG(sc_link, SDEV_DB3, ("density specified variable\n"));
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;
}
SC_DEBUG(sc_link, SDEV_DB3, ("density specified fixed\n"));
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;
SC_DEBUG(sc_link, SDEV_DB3,
("Used media_blksiz of %ld\n", st->media_blksiz));
goto done;
}
/*
* We're getting no hints from any direction. Choose variable-
* length blocks arbitrarily.
*/
st->flags &= ~ST_FIXEDBLOCKS;
st->blksiz = 0;
SC_DEBUG(sc_link, SDEV_DB3, ("Give up and default to variable mode\n"));
done:
/*
* 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.
* (I think this should be a by-product of fixed/variable..julian)
*/
switch ((int)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:
case QIC_3080:
st->flags &= ~ST_2FM_AT_EOD;
break;
default:
st->flags |= ST_2FM_AT_EOD;
}
return 0;
}
/*
* 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.
*/
static void
st_strategy(struct buf *bp, struct scsi_link *sc_link)
{
u_int32_t unit;
u_int32_t opri;
struct scsi_data *st;
int len;
unit = STUNIT((bp->b_dev));
st = sc_link->sd;
/*
* If it's a null transfer, return immediatly
*/
if ((len = bp->b_bcount) == 0) {
goto done;
}
/*
* Check the adapter can do it
*/
scsi_minphys(bp,&st_switch);
/*
* Odd sized request on fixed drives are verboten
*/
if (st->flags & ST_FIXEDBLOCKS) {
if (bp->b_bcount % st->blksiz) {
printf("st%ld: bad request, must be multiple of %ld\n",
unit, st->blksiz);
bp->b_error = EIO;
goto bad;
}
}
/*
* as are out-of-range requests on variable drives.
* (or if we got chopped by minphys)
*/
else {
if ((bp->b_bcount < st->blkmin || bp->b_bcount > st->blkmax)) {
printf("st%ld: bad request, must be between %ld and %ld\n",
unit, st->blkmin, st->blkmax);
bp->b_error = EIO;
goto bad;
}
if (len != bp->b_bcount) {
printf("st%ld: bad request, must be less than %ld bytes\n",
unit, bp->b_bcount + 1);
bp->b_error = EIO;
goto bad;
}
}
opri = splbio();
/*
* Use a bounce buffer if necessary
*/
#ifdef BOUNCE_BUFFERS
if (sc_link->flags & SDEV_BOUNCE)
vm_bounce_alloc(bp);
#endif
/*
* 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() ))
*/
TAILQ_INSERT_TAIL(&st->buf_queue, bp, b_act);
/*
* 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, 0);
splx(opri);
return;
bad:
bp->b_flags |= B_ERROR;
done:
/*
* Correctly set the buf to indicate a completed xfer
*/
biodone(bp);
return;
}
/*
* ststart looks to see if there is a buf waiting for the device
* and that the device is not already busy. If both are true,
* It dequeues the buf and creates a scsi command to perform the
* transfer required. The transfer request will call scsi_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
*/
static void
ststart(unit, flags)
u_int32_t unit;
u_int32_t flags;
{
struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit);
struct scsi_data *st = sc_link->sd;
register struct buf *bp = 0;
struct scsi_rw_tape cmd;
SC_DEBUG(sc_link, SDEV_DB2, ("ststart "));
/*
* See if there is a buf to do and we are not already
* doing one
*/
while (sc_link->opennings != 0) {
/* if a special awaits, let it proceed first */
if (sc_link->flags & SDEV_WAITING) {
sc_link->flags &= ~SDEV_WAITING;
wakeup((caddr_t)sc_link);
return;
}
bp = st->buf_queue.tqh_first;
if (bp == NULL) { /* yes, an assign */
return;
}
TAILQ_REMOVE( &st->buf_queue, bp, b_act);
/*
* if the device has been unmounted by the user
* then throw away all requests until done
*/
if ((!(st->flags & ST_MOUNTED))
|| (!(sc_link->flags & SDEV_MEDIA_LOADED))) {
/* make sure that one implies the other.. */
sc_link->flags &= ~SDEV_MEDIA_LOADED;
goto badnews;
}
/*
* 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.
* Back up over filemark
*/
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);
continue; /* seek more work */
}
}
/*
* 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);
continue; /* seek more work */
}
}
/*
* 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;
scsi_uto3b(bp->b_bcount / st->blksiz, cmd.len);
} else {
scsi_uto3b(bp->b_bcount, cmd.len);
}
/*
* go ask the adapter to do all this for us
*/
if (scsi_scsi_cmd(sc_link,
(struct scsi_generic *) &cmd,
sizeof(cmd),
(u_char *) bp->b_un.b_addr,
bp->b_bcount,
0, /* can't retry a read on a tape really */
100000,
bp,
flags) == SUCCESSFULLY_QUEUED) {
} else {
badnews:
printf("st%ld: oops not queued\n", unit);
bp->b_flags |= B_ERROR;
bp->b_error = EIO;
biodone(bp);
}
} /* go back and see if we can cram more work in.. */
}
/*
* Perform special action on behalf of the user;
* knows about the internals of this device
*/
static errval
st_ioctl(dev_t dev, int cmd, caddr_t arg, int flag,
struct proc *p, struct scsi_link *sc_link)
{
errval errcode = 0;
u_int32_t unit;
u_int32_t number, flags, dsty;
struct scsi_data *st;
u_int32_t hold_blksiz;
u_int32_t hold_density;
int32_t nmarks;
struct mtop *mt = (struct mtop *) arg;
/*
* Find the device that the user is talking about
*/
flags = 0; /* give error messages, act on errors etc. */
unit = STUNIT(dev);
dsty = DSTY(dev);
st = sc_link->sd;
hold_blksiz = st->blksiz;
hold_density = st->density;
switch (cmd) {
case MTIOCGET:
{
struct mtget *g = (struct mtget *) arg;
SC_DEBUG(sc_link, SDEV_DB1, ("[ioctl: get status]\n"));
bzero(g, sizeof(struct mtget));
g->mt_type = 0x7; /* Ultrix compat *//*? */
g->mt_density = st->density;
g->mt_blksiz = st->blksiz;
g->mt_comp = st->comp;
g->mt_density0 = st->modes[0].density;
g->mt_density1 = st->modes[1].density;
g->mt_density2 = st->modes[2].density;
g->mt_density3 = st->modes[3].density;
g->mt_blksiz0 = st->modes[0].blksiz;
g->mt_blksiz1 = st->modes[1].blksiz;
g->mt_blksiz2 = st->modes[2].blksiz;
g->mt_blksiz3 = st->modes[3].blksiz;
g->mt_comp0 = 0;
g->mt_comp1 = 0;
g->mt_comp2 = 0;
g->mt_comp3 = 0;
break;
}
case MTIOCTOP:
{
SC_DEBUG(sc_link, SDEV_DB1, ("[ioctl: op=0x%x count=0x%lx]\n",
mt->mt_op, mt->mt_count));
/* compat: in U*x it is a short */
number = mt->mt_count;
switch ((short) (mt->mt_op)) {
case MTWEOF: /* write an end-of-file record */
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 MTEOD: /* space to end of recorded medium */
errcode = st_chkeod(unit, FALSE, &nmarks, flags);
if (errcode == ESUCCESS)
errcode = st_space(unit, 0, SP_EOM,
flags);
break;
case MTREW: /* rewind */
errcode = st_rewind(unit, FALSE, flags);
break;
case MTERASE: /* erase */
errcode = st_erase(unit, FALSE, flags);
break;
case MTRETENS: /* re-tension tape */
errcode = st_load(unit, LD_LOAD|LD_RETEN,
flags);
break;
case MTOFFL: /* rewind and put the drive offline */
/*
* Be sure to allow media removal before
* attempting the eject.
*/
scsi_prevent(sc_link, PR_ALLOW, SCSI_SILENT);
st_unmount(unit, EJECT);
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 */
#ifdef NOTYET
if (!(st->flags & ST_NEW_MOUNT)) {
uprintf("re-mount tape before changing blocksize");
errcode = EINVAL;
break;
}
#endif
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; /*XXX */
goto try_new_value;
case MTSETDNSTY: /* Set density for device and mode */
if (number > (u_int8_t)0xff) {
/* Guard against overflows */
errcode = EINVAL;
} else {
st->density = number;
goto try_new_value;
}
break;
case MTCOMP: /* enable default compression */
errcode = st_comp(unit,number);
break;
default:
errcode = EINVAL;
}
break;
}
case MTIOCIEOT:
case MTIOCEEOT:
break;
default:
if(IS_CTLMODE(dev))
errcode = scsi_do_ioctl(dev, cmd, arg, flag, p, sc_link);
else
errcode = ENOTTY;
break;
}
return errcode;
/*-----------------------------*/
try_new_value:
/*
* Check that the mode being asked for is aggreeable to the
* drive. If not, put it back the way it was.
*/
if ( (errcode = st_mode_select(unit, 0, NULL, 0)) ) { /* put back as it was */
printf("st%ld: Cannot set selected mode", unit);
st->density = hold_density;
st->blksiz = hold_blksiz;
if (st->blksiz) {
st->flags |= ST_FIXEDBLOCKS;
} else {
st->flags &= ~ST_FIXEDBLOCKS;
}
return (errcode);
}
/*
* As the drive liked it, if we are setting a new default,
* set it into the structures as such.
*
* The means for deciding this are not finalised yet
*/
if (IS_CTLMODE(dev)) {
/* special mode */
/* XXX */
switch ((short) (mt->mt_op)) {
case MTSETBSIZ:
st->modes[dsty].blksiz = st->blksiz;
st->modeflags[dsty] |= BLKSIZE_SET_BY_USER;
break;
case MTSETDNSTY:
st->modes[dsty].density = st->density;
st->modeflags[dsty] |= DENSITY_SET_BY_USER;
break;
}
}
return 0;
}
/*
* Do a synchronous read.
*/
static errval
st_read(unit, buf, size, flags)
u_int32_t unit, size, flags;
char *buf;
{
struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit);
struct scsi_data *st = sc_link->sd;
struct scsi_rw_tape scsi_cmd;
/*
* If it's a null transfer, return immediatly
*/
if (size == 0) {
return (ESUCCESS);
}
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = READ_COMMAND_TAPE;
if (st->flags & ST_FIXEDBLOCKS) {
scsi_cmd.byte2 |= SRWT_FIXED;
scsi_uto3b(size / (st->blksiz ? st->blksiz : DEF_FIXED_BSIZE),
scsi_cmd.len);
} else {
scsi_uto3b(size, scsi_cmd.len);
}
return (scsi_scsi_cmd(sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
(u_char *) buf,
size,
0, /* not on io commands */
100000,
NULL,
flags | SCSI_DATA_IN));
}
#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.
*/
static errval
st_rd_blk_lim(unit, flags)
u_int32_t unit, flags;
{
struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit);
struct scsi_data *st = sc_link->sd;
struct scsi_blk_limits scsi_cmd;
struct scsi_blk_limits_data scsi_blkl;
errval errno;
/*
* First check if we have it all loaded
*/
if ((sc_link->flags & SDEV_MEDIA_LOADED))
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 = scsi_scsi_cmd(sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
(u_char *) & scsi_blkl,
sizeof(scsi_blkl),
ST_RETRIES,
5000,
NULL,
flags | SCSI_DATA_IN)) ) {
return errno;
}
st->blkmin = b2tol(scsi_blkl.min_length);
st->blkmax = scsi_3btou(&scsi_blkl.max_length_2);
SC_DEBUG(sc_link, SDEV_DB3,
("(%ld <= blksiz <= %ld)\n", st->blkmin, st->blkmax));
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)
*/
static errval
st_mode_sense(unit, flags, page, pagelen, pagecode)
u_int32_t unit, flags;
struct tape_pages *page;
u_int32_t pagelen,pagecode;
{
u_int32_t dat_len;
errval errno;
struct scsi_mode_sense scsi_cmd;
struct {
struct scsi_mode_header header;
struct blk_desc blk_desc;
struct tape_pages page;
} dat;
/* 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
*/
struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit);
struct scsi_data *st = sc_link->sd;
st->flags &= ~ST_SENSE_READ;
/*
* Check if we need to use a default page..
*/
if ((st->quirks & ST_Q_NEEDS_PAGE_0) && (!page)) {
pagelen = PAGE_0_SENSE_DATA_SIZE;
page = (struct tape_pages *) st->saved_page0;
pagecode = 0;
}
/*
* Now work out the total dat size etc.
*/
dat_len = sizeof(struct scsi_mode_header)
+ sizeof(struct blk_desc)
+ (page ? pagelen : 0);
/*
* Set up a mode sense
*/
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = MODE_SENSE;
scsi_cmd.page = (u_char) pagecode;
scsi_cmd.length = dat_len;
/*
* do the command,
* use the results to set blksiz, numblks and density
* or if we need it as a template for the mode select
* store it away.
*/
if ( (errno = scsi_scsi_cmd(sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
(u_char *) &dat,
dat_len,
ST_RETRIES,
5000,
NULL,
flags | SCSI_DATA_IN)) ) {
return errno;
}
st->numblks = scsi_3btou(dat.blk_desc.nblocks);
st->media_blksiz = scsi_3btou(dat.blk_desc.blklen);
st->media_density = dat.blk_desc.density;
if (dat.header.dev_spec & SMH_DSP_WRITE_PROT) {
st->flags |= ST_READONLY;
}
SC_DEBUG(sc_link, SDEV_DB3,
("density code 0x%lx, %ld-byte blocks, write-%s, ",
st->media_density, st->media_blksiz,
st->flags & ST_READONLY ? "protected" : "enabled"));
SC_DEBUG(sc_link, SDEV_DB3, ("%sbuffered\n",
((dat.header.dev_spec & SMH_DSP_BUFF_MODE) ? "" : "un")));
if (page) {
bcopy(&dat.page, page, pagelen);
}
st->flags |= ST_SENSE_READ;
return 0;
}
/*
* Send a filled out parameter structure to the drive to
* set it into the desire modes etc.
*/
static errval
st_mode_select(unit, flags, page, pagelen)
u_int32_t unit, flags;
struct tape_pages *page;
u_int32_t pagelen;
{
u_int32_t dat_len;
struct scsi_mode_select scsi_cmd;
struct {
struct scsi_mode_header header;
struct blk_desc blk_desc;
struct tape_pages page;
} dat;
struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit);
struct scsi_data *st = sc_link->sd;
/*
* Check if we need to use a default page..
* Gee, hope we saved one before now........
*/
if ((st->quirks & ST_Q_NEEDS_PAGE_0) && (!page)) {
pagelen = PAGE_0_SENSE_DATA_SIZE;
page = (struct tape_pages *) st->saved_page0;
}
/*
* Now work out the total dat size etc.
*/
dat_len = sizeof(struct scsi_mode_header)
+ sizeof(struct blk_desc)
+ (page ? pagelen : 0);
/*
* Set up for a mode select
*/
bzero(&dat, dat_len);
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = MODE_SELECT;
scsi_cmd.length = dat_len;
dat.header.blk_desc_len = sizeof(struct blk_desc);
dat.header.dev_spec |= SMH_DSP_BUFF_MODE_ON;
dat.blk_desc.density = st->density;
if (st->flags & ST_FIXEDBLOCKS) {
scsi_uto3b(st->blksiz, dat.blk_desc.blklen);
}
if (page) {
bcopy(page, &dat.page, pagelen);
/* the Tandberg tapes need the block size to */
/* be set on each mode sense/select. */
}
/*
* do the command
*/
return (scsi_scsi_cmd(sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
(u_char *) &dat,
dat_len,
ST_RETRIES,
5000,
NULL,
flags | SCSI_DATA_OUT));
}
static int noisy_st = 0;
/***************************************************************\
* Set the compression mode of the drive to on (1) or off (0) *
still doesn't work! grrr!
\***************************************************************/
static errval
st_comp(unit,mode)
u_int32_t unit,mode;
{
struct tape_pages page;
int pagesize;
int retval;
struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit);
struct scsi_data *st = sc_link->sd;
bzero(&page, sizeof(page));
pagesize = sizeof(page.pages.configuration) + PAGE_HEADERLEN;
if ( (retval = st_mode_sense(unit, 0,
&page, pagesize, ST_PAGE_CONFIGURATION)) )
{
printf("sense returned an error of %d\n",retval);
return retval;
}
if ( noisy_st)
printf("drive reports value of %d, setting %ld\n",
page.pages.configuration.data_compress_alg,mode);
page.pg_code &= ST_P_CODE;
page.pg_length = sizeof(page.pages.configuration);
switch(mode)
{
case 0:
page.pages.configuration.data_compress_alg = 0;
break;
case 1:
page.pages.configuration.data_compress_alg = 1;
break;
default:
printf("st%ld: bad value for compression mode\n",unit);
return EINVAL;
}
if ( (retval = st_mode_select(unit, 0, &page, pagesize)) )
{
printf("select returned an error of %d\n",retval);
return retval;
}
st->comp = mode;
return 0;
}
/*
* skip N blocks/filemarks/seq filemarks/eom
*/
static errval
st_space(unit, number, what, flags)
u_int32_t unit, what, flags;
int32_t number;
{
errval error;
struct scsi_space scsi_cmd;
struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit);
struct scsi_data *st = sc_link->sd;
switch ((int)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) { /* pretend we just discover the error */
st->flags &= ~ST_EIO_PENDING;
return (EIO);
} else if (number < 0) { /* back away from the error */
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)) { /* back away from unwritten tape */
st->flags &= ~ST_BLANK_READ;
number++; /* dubious */
}
break;
case SP_EOM:
if (st->flags & ST_EIO_PENDING)
{
/* we are already at EOM */
st->flags &= ~ST_EIO_PENDING;
return(ESUCCESS);
}
number = 1; /* we have only one end-of-medium */
break;
}
if (number == 0) {
return (ESUCCESS);
}
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = SPACE;
scsi_cmd.byte2 = what & SS_CODE;
scsi_uto3b(number, scsi_cmd.number);
return (scsi_scsi_cmd(sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
0,
0,
0, /* no retries please , just fail */
3600000, /* wait up to an hour for completion */
NULL,
flags));
}
/*
* write N filemarks
*/
static errval
st_write_filemarks(unit, number, flags)
u_int32_t unit, flags;
int32_t number;
{
struct scsi_write_filemarks scsi_cmd;
struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit);
struct scsi_data *st = sc_link->sd;
/*
* It's hard to write a negative number of file marks.
* Don't try.
*/
if (number < 0) {
return EINVAL;
}
switch ((int)number) {
case 0: /* really a command to sync the drive's buffers */
break;
case 1:
if (st->flags & ST_FM_WRITTEN) { /* already have one down */
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;
scsi_uto3b(number, scsi_cmd.number);
return scsi_scsi_cmd(sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
0,
0,
0, /* no retries, just fail */
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.
*/
static int32_t
st_chkeod(unit, position, nmarks, flags)
u_int32_t unit;
boolean position;
int32_t *nmarks;
u_int32_t flags;
{
errval error;
struct scsi_data *st = SCSI_DATA(&st_switch, unit);
switch ((int)(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)
*/
static errval
st_load(unit, type, flags)
u_int32_t unit, type, flags;
{
struct scsi_load scsi_cmd;
struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit);
struct scsi_data *st = sc_link->sd;
bzero(&scsi_cmd, sizeof(scsi_cmd));
if (type != LD_LOAD) {
errval error;
int32_t nmarks;
error = st_chkeod(unit, FALSE, &nmarks, flags);
if (error != ESUCCESS)
return (error);
sc_link->flags &= ~SDEV_MEDIA_LOADED;
}
if (st->quirks & ST_Q_IGNORE_LOADS)
return (0);
scsi_cmd.op_code = LOAD_UNLOAD;
scsi_cmd.how |= type;
return (scsi_scsi_cmd(sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
0,
0,
ST_RETRIES,
900000, /* 15 min */
NULL,
flags));
}
/*
* Rewind the device
*/
static errval
st_rewind(unit, immed, flags)
u_int32_t unit, flags;
boolean immed;
{
struct scsi_rewind scsi_cmd;
struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit);
struct scsi_data *st = sc_link->sd;
errval error;
int32_t nmarks;
error = st_chkeod(unit, FALSE, &nmarks, flags);
if (error != ESUCCESS)
return (error);
st->flags &= ~ST_PER_ACTION;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = REWIND;
scsi_cmd.byte2 = immed ? SR_IMMED : 0;
return (scsi_scsi_cmd(sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
0,
0,
ST_RETRIES,
immed ? 5000 : 300000, /* 5 sec or 5 min */
NULL,
flags));
}
/*
** Erase the device
*/
static errval
st_erase(unit, immed, flags)
u_int32_t unit, flags;
boolean immed;
{
struct scsi_erase scsi_cmd;
struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit);
struct scsi_data *st = sc_link->sd;
errval error;
int32_t nmarks;
error = st_chkeod(unit, FALSE, &nmarks, flags);
if (error != ESUCCESS)
return (error);
/*
** Archive Viper 2525 technical manual 5.7 (ERASE 19h):
** tape has to be positioned to BOT first before erase command
** is issued or command is rejected. So we rewind the tape first
** and exit with an error, if the tape can't be rewinded.
*/
error = st_rewind(unit, FALSE, SCSI_SILENT);
if (error != ESUCCESS)
return (error);
st->flags &= ~ST_PER_ACTION;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = ERASE;
scsi_cmd.byte2 = SE_LONG; /* LONG_ERASE */
scsi_cmd.byte2 += immed ? SE_IMMED : 0; /* immed bit is here the 2nd! */
return (scsi_scsi_cmd(sc_link,
(struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd),
0,
0,
ST_RETRIES,
immed ? 5000 : (200 * 60 * 1000), /* 5 sec or 200 min */
NULL,
flags));
}
/*
* Look at the returned sense and act on the error and detirmine
* The unix error number to pass back... (0 = report no error)
* (SCSIRET_CONTINUE = continue processing)
*/
static errval
st_interpret_sense(xs)
struct scsi_xfer *xs;
{
struct scsi_link *sc_link = xs->sc_link;
struct scsi_sense_data *sense = &(xs->sense);
boolean silent = xs->flags & SCSI_SILENT;
u_int32_t unit = sc_link->dev_unit;
struct scsi_data *st = SCSI_DATA(&st_switch, unit);
u_int32_t key;
int32_t info;
/*
* Get the sense fields and work out what code
*/
if (sense->error_code & SSD_ERRCODE_VALID) {
info = ntohl(*((int32_t *) sense->ext.extended.info));
} else {
if (st->flags & ST_FIXEDBLOCKS) {
info = xs->datalen / st->blksiz;
} else {
info = xs->datalen;
}
}
key = sense->ext.extended.flags & SSD_KEY;
if (((sense->error_code & SSD_ERRCODE) != 0x70)
|| (key == 0x7)) /* Media Write Protected */ {
return SCSIRET_CONTINUE;/* let the generic code handle it */
}
if(sense->ext.extended.flags & (SSD_EOM|SSD_FILEMARK|SSD_ILI)) {
if (st->flags & ST_FIXEDBLOCKS) {
xs->resid = info * st->blksiz;
xs->flags |= SCSI_RESID_VALID;
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%ld: block wrong size"
", %ld blocks residual\n", unit
,info);
/*XXX*/ /* is this how it works ? */
/* check def of ILI for fixed blk tapes */
/*
* 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_SENSE_READ)) {
st->blksiz -= 512;
}
}
/*
* If no data was tranfered, do it immediatly
*/
if (xs->resid >= xs->datalen) {
xs->flags &= ~SCSI_RESID_VALID;
if (st->flags & ST_AT_FILEMARK) {
xs->flags |= SCSI_EOF;
st->flags &= ~ST_AT_FILEMARK;
return 0;
}
if (st->flags & ST_EIO_PENDING) {
st->flags &= ~ST_EIO_PENDING;
return EIO;
}
}
return 0;
} else { /* must be variable mode */
xs->resid = xs->datalen; /* to be sure */
if (sense->ext.extended.flags & SSD_EOM) {
return (EIO);
}
if (sense->ext.extended.flags & SSD_FILEMARK) {
xs->flags |= SCSI_EOF;
}
if (sense->ext.extended.flags & SSD_ILI) {
if (info < 0) {
/*
* the record was bigger than the read
*/
if (!silent)
printf("st%ld: %ld-byte record "
"too big\n", unit,
xs->datalen - info);
return (EIO);
}
xs->resid = info;
xs->flags |= SCSI_RESID_VALID;
}
}
return 0;
}
if (key == 0x8) {
xs->flags |= SCSI_EOF; /* some drives need this */
/*
* 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_SENSE_READ)) {
/* still starting */
st->blksiz -= 512;
} else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) {
st->flags |= ST_BLANK_READ;
xs->flags |= SCSI_EOF;
return (ESUCCESS);
}
}
return SCSIRET_CONTINUE; /* Use the the generic handler */
}
/*
* 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 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.
*/
static errval
st_touch_tape(unit)
u_int32_t unit;
{
struct scsi_data *st = SCSI_DATA(&st_switch, unit);
char *buf;
u_int32_t readsiz;
errval errno;
buf = malloc(1024, M_TEMP, M_NOWAIT);
if (!buf)
return (ENOMEM);
if (( errno = st_mode_sense(unit, 0, NULL, 0, 0)) ) {
goto bad;
}
st->blksiz = (st->quirks & ST_Q_NO_1024)? 512: 1024;
do {
switch ((int)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, NULL, 0)) ) {
goto bad;
}
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);
return 0;
}
static st_devsw_installed = 0;
static void
st_drvinit(void *unused)
{
if( ! st_devsw_installed ) {
bdevsw_add_generic(BDEV_MAJOR, CDEV_MAJOR, &st_bdevsw);
st_devsw_installed = 1;
}
}
SYSINIT(stdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,st_drvinit,NULL)
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