diff options
Diffstat (limited to 'sys/scsi/st.c')
| -rw-r--r-- | sys/scsi/st.c | 2005 |
1 files changed, 0 insertions, 2005 deletions
diff --git a/sys/scsi/st.c b/sys/scsi/st.c deleted file mode 100644 index b4feb02..0000000 --- a/sys/scsi/st.c +++ /dev/null @@ -1,2005 +0,0 @@ -/* - * 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 1.93 1998/08/18 00:32:49 bde 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_devfs.h" -#include "opt_scsi.h" - -#include <sys/param.h> -#include <sys/systm.h> - -#include <sys/fcntl.h> -#include <sys/malloc.h> -#include <sys/buf.h> -#include <sys/mtio.h> -#include <sys/conf.h> -#include <sys/kernel.h> -#ifdef DEVFS -#include <sys/devfsext.h> -#endif /*DEVFS*/ - -#include <scsi/scsi_tape.h> -#include <scsi/scsiconf.h> -#include <scsi/scsi_debug.h> -#include <scsi/scsi_driver.h> - -#include "ioconf.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, u_int32_t byte2)); -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, u_long 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_read_t stread; -static d_write_t stwrite; -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 = { - stopen, stclose, stread, stwrite, - stioctl, nostop, nullreset, nodevtotty, - seltrue, nommap, ststrategy, "st", - NULL, -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) - -/* - * 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; - - bufq_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, ", (u_long)st->media_density); - if (!scsi_test_unit_ready(sc_link, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT)) { - if (st->media_blksiz) { - printf("%lu-byte", (u_long)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; -#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%lu.%d", (u_long)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%lu.%d", (u_long)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%lu.%d", (u_long)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%luctl.%d", (u_long)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%lu", (u_long)unit); - st->devfs_token.nrst = - devfs_link(st->devfs_token.nrst_[0], "nrst%lu", (u_long)unit); - st->devfs_token.erst = - devfs_link(st->devfs_token.erst_[0], "erst%lu", (u_long)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 & FWRITE) - st->flags |= ST_WRITTEN; - - /* PREVENT ALLOW MEDIUM REMOVAL is optional per the SCSI-2 specs */ - scsi_prevent(sc_link, PR_PREVENT, SCSI_SILENT | SCSI_ERR_OK); - - 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; - errval errcode = 0; - - unit = STUNIT(dev); - mode = MODE(dev); - st = sc_link->sd; - - if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) - errcode = 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 (errcode); -} - -/* - * 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, 0)) ) { - printf("st%lu: Cannot set selected mode", (u_long)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%lu: bad quirks\n", (u_long)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(%lu)\n", - (u_long)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 %lu\n", (u_long)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 %lu\n", (u_long)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; -} - -static int -stread(dev_t dev, struct uio *uio, int ioflag) -{ - return (physio(ststrategy, NULL, dev, 1, minphys, uio)); -} - -static int -stwrite(dev_t dev, struct uio *uio, int ioflag) -{ - return (physio(ststrategy, NULL, dev, 0, minphys, uio)); -} - -/* - * 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%lu: bad request, must be multiple of %lu\n", - (u_long)unit, (u_long)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%lu: bad request, must be between %lu and %lu\n", - (u_long)unit, (u_long)st->blkmin, - (u_long)st->blkmax); - bp->b_error = EIO; - goto bad; - } - if (len != bp->b_bcount) { - printf( - "st%lu: bad request, must be less than %ld bytes\n", - (u_long)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() )) - */ - bufq_insert_tail(&st->buf_queue, bp); - - /* - * 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 = bufq_first(&st->buf_queue); - if (bp == NULL) { /* yes, an assign */ - return; - } - bufq_remove(&st->buf_queue, bp); - - /* - * 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_data, - bp->b_bcount, - 0, /* can't retry a read on a tape really */ - 1000000, - bp, - flags) == SUCCESSFULLY_QUEUED) { - } else { -badnews: - printf("st%lu: oops not queued\n", (u_long)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, u_long 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, (long)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, 0)) ) { - /* - * put back as it was - */ - printf("st%lu: Cannot set selected mode", (u_long)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 */ - 1000000, - 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 its 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, - ("(%lu <= blksiz <= %lu)\n", - (u_long)st->blkmin, (u_long)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, %lu-byte blocks, write-%s, ", - (u_long)st->media_density, (u_long)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, byte2) - u_int32_t unit, flags; - struct tape_pages *page; - u_int32_t pagelen; - u_int32_t byte2; -{ - 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; - scsi_cmd.byte2 = (u_char)byte2; - 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 %lu\n", - page.pages.configuration.data_compress_alg, - (u_long)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%lu: bad value for compression mode\n", (u_long)unit); - return EINVAL; - } - /* - * send ST_PAGE_CONFIGURATION page as SCSI-II command because it - * is a SCSI-II structure. This requires the PF bit (0x10) to be - * set for byte2. - */ - if ( (retval = st_mode_select(unit, 0, &page, pagesize, 0x10)) ) - { - 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 */ - 1000000, /* 100 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%lu: block wrong size, %ld blocks residual\n", - (u_long)unit, (long)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%lu: %ld-byte record too big\n", - (u_long)unit, - (long)(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; - -#ifdef BOUNCE_BUFFERS - buf = (caddr_t) vm_bounce_kva_alloc(btoc(1024)); -#else - buf = malloc(1024, M_TEMP, M_NOWAIT); -#endif - 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, 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); -#ifdef BOUNCE_BUFFERS - vm_bounce_kva_alloc_free((vm_offset_t) buf, btoc(1024)); -#else - free(buf, M_TEMP); -#endif - return 0; -} - -static st_devsw_installed = 0; - -static void -st_drvinit(void *unused) -{ - - if( ! st_devsw_installed ) { - dev_t dev; - - dev = makedev(CDEV_MAJOR, 0); - cdevsw_add(&dev, &st_cdevsw, NULL); - st_devsw_installed = 1; - } -} - -SYSINIT(stdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,st_drvinit,NULL) - - |
