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Diffstat (limited to 'sys/scsi/st.c')
| -rw-r--r-- | sys/scsi/st.c | 1786 |
1 files changed, 1786 insertions, 0 deletions
diff --git a/sys/scsi/st.c b/sys/scsi/st.c new file mode 100644 index 00000000000..3bc47126faa --- /dev/null +++ b/sys/scsi/st.c @@ -0,0 +1,1786 @@ +/* $NetBSD: st.c,v 1.54 1995/10/13 20:01:08 gwr Exp $ */ + +/* + * Copyright (c) 1994 Charles Hannum. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Charles Hannum. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * Originally written by Julian Elischer (julian@tfs.com) + * for TRW Financial Systems for use under the MACH(2.5) operating system. + * + * TRW Financial Systems, in accordance with their agreement with Carnegie + * Mellon University, makes this software available to CMU to distribute + * or use in any manner that they see fit as long as this message is kept with + * the software. For this reason TFS also grants any other persons or + * organisations permission to use or modify this software. + * + * TFS supplies this software to be publicly redistributed + * on the understanding that TFS is not responsible for the correct + * functioning of this software in any circumstances. + * + * 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 <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/user.h> +#include <sys/mtio.h> +#include <sys/device.h> + +#include <scsi/scsi_all.h> +#include <scsi/scsi_tape.h> +#include <scsi/scsiconf.h> + +/* Defines for device specific stuff */ +#define DEF_FIXED_BSIZE 512 +#define ST_RETRIES 4 /* only on non IO commands */ + +#define STMODE(z) ( minor(z) & 0x03) +#define STDSTY(z) ((minor(z) >> 2) & 0x03) +#define STUNIT(z) ((minor(z) >> 4) ) +#define CTLMODE 3 + +#define SCSI_2_MAX_DENSITY_CODE 0x17 /* maximum density code specified + * in SCSI II spec. */ +/* + * Define various devices that we know mis-behave in some way, + * and note how they are bad, so we can correct for them + */ +struct modes { + u_int quirks; /* same definitions as in quirkdata */ + int blksize; + u_int8_t density; +}; + +struct quirkdata { + u_int quirks; +#define ST_Q_FORCE_BLKSIZE 0x0001 +#define ST_Q_SENSE_HELP 0x0002 /* must do READ for good MODE SENSE */ +#define ST_Q_IGNORE_LOADS 0x0004 +#define ST_Q_BLKSIZE 0x0008 /* variable-block media_blksize > 0 */ + u_int page_0_size; +#define MAX_PAGE_0_SIZE 64 + struct modes modes[4]; +}; + +struct st_quirk_inquiry_pattern { + struct scsi_inquiry_pattern pattern; + struct quirkdata quirkdata; +}; + +struct st_quirk_inquiry_pattern st_quirk_patterns[] = { + {T_SEQUENTIAL, T_REMOV, + " ", " ", " ", 0, 0, { + ST_Q_FORCE_BLKSIZE, 512, 0, /* minor 0-3 */ + ST_Q_FORCE_BLKSIZE, 512, QIC_24, /* minor 4-7 */ + ST_Q_FORCE_BLKSIZE, 0, HALFINCH_1600, /* minor 8-11 */ + ST_Q_FORCE_BLKSIZE, 0, HALFINCH_6250 /* minor 12-15 */ + }}, + {T_SEQUENTIAL, T_REMOV, + "TANDBERG", " TDC 3600 ", "", 0, 12, { + 0, 0, 0, /* minor 0-3 */ + ST_Q_FORCE_BLKSIZE, 0, QIC_525, /* minor 4-7 */ + 0, 0, QIC_150, /* minor 8-11 */ + 0, 0, QIC_120 /* minor 12-15 */ + }}, + {T_SEQUENTIAL, T_REMOV, + "TANDBERG", " TDC 3800 ", "", 0, 0, { + ST_Q_FORCE_BLKSIZE, 512, 0, /* minor 0-3 */ + 0, 0, QIC_525, /* minor 4-7 */ + 0, 0, QIC_150, /* minor 8-11 */ + 0, 0, QIC_120 /* minor 12-15 */ + }}, + /* + * At least -005 and -007 need this. I'll assume they all do unless I + * hear otherwise. - mycroft, 31MAR1994 + */ + {T_SEQUENTIAL, T_REMOV, + "ARCHIVE ", "VIPER 2525 25462", "", 0, 0, { + ST_Q_SENSE_HELP, 0, 0, /* minor 0-3 */ + ST_Q_SENSE_HELP, 0, QIC_525, /* minor 4-7 */ + 0, 0, QIC_150, /* minor 8-11 */ + 0, 0, QIC_120 /* minor 12-15 */ + }}, + /* + * One user reports that this works for his tape drive. It probably + * needs more work. - mycroft, 09APR1994 + */ + {T_SEQUENTIAL, T_REMOV, + "SANKYO ", "CP525 ", "", 0, 0, { + ST_Q_FORCE_BLKSIZE, 512, 0, /* minor 0-3 */ + ST_Q_FORCE_BLKSIZE, 512, QIC_525, /* minor 4-7 */ + 0, 0, QIC_150, /* minor 8-11 */ + 0, 0, QIC_120 /* minor 12-15 */ + }}, + {T_SEQUENTIAL, T_REMOV, + "ANRITSU ", "DMT780 ", "", 0, 0, { + ST_Q_FORCE_BLKSIZE, 512, 0, /* minor 0-3 */ + ST_Q_FORCE_BLKSIZE, 512, QIC_525, /* minor 4-7 */ + 0, 0, QIC_150, /* minor 8-11 */ + 0, 0, QIC_120 /* minor 12-15 */ + }}, + {T_SEQUENTIAL, T_REMOV, + "ARCHIVE ", "VIPER 150 21247", "", 0, 12, { + 0, 0, 0, /* minor 0-3 */ + 0, 0, QIC_150, /* minor 4-7 */ + 0, 0, QIC_120, /* minor 8-11 */ + 0, 0, QIC_24 /* minor 12-15 */ + }}, + {T_SEQUENTIAL, T_REMOV, + "WANGTEK ", "5099ES SCSI", "", 0, 0, { + ST_Q_FORCE_BLKSIZE, 512, 0, /* minor 0-3 */ + 0, 0, QIC_11, /* minor 4-7 */ + 0, 0, QIC_24, /* minor 8-11 */ + 0, 0, QIC_24, /* minor 12-15 */ + }}, + {T_SEQUENTIAL, T_REMOV, + "WANGTEK ", "5150ES SCSI", "", 0, 0, { + ST_Q_FORCE_BLKSIZE, 512, 0, /* minor 0-3 */ + 0, 0, QIC_24, /* minor 4-7 */ + 0, 0, QIC_120, /* minor 8-11 */ + 0, 0, QIC_150 /* minor 12-15 */ + }}, + {T_SEQUENTIAL, T_REMOV, + "WANGTEK ", "5525ES SCSI REV7", "", 0, 0, { + 0, 0, 0, /* minor 0-3 */ + ST_Q_BLKSIZE, 0, QIC_525, /* minor 4-7 */ + 0, 0, QIC_150, /* minor 8-11 */ + 0, 0, QIC_120 /* minor 12-15 */ + }}, + {T_SEQUENTIAL, T_REMOV, + "WangDAT ", "Model 1300 ", "", 0, 0, { + 0, 0, 0, /* minor 0-3 */ + ST_Q_FORCE_BLKSIZE, 512, DDS, /* minor 4-7 */ + ST_Q_FORCE_BLKSIZE, 1024, DDS, /* minor 8-11 */ + ST_Q_FORCE_BLKSIZE, 0, DDS /* minor 12-15 */ + }}, +#if 0 + {T_SEQUENTIAL, T_REMOV, + "EXABYTE ", "EXB-8200 ", "", 0, 12, { + 0, 0, 0, /* minor 0-3 */ + 0, 0, 0, /* minor 4-7 */ + 0, 0, 0, /* minor 8-11 */ + 0, 0, 0 /* minor 12-15 */ + }}, +#endif +}; + +#define NOEJECT 0 +#define EJECT 1 + +struct st_softc { + struct device sc_dev; +/*--------------------present operating parameters, flags etc.----------------*/ + int flags; /* see below */ + u_int quirks; /* quirks for the open mode */ + int blksize; /* blksize we are using */ + u_int8_t density; /* present density */ + u_int page_0_size; /* size of page 0 data */ + u_int last_dsty; /* last density opened */ +/*--------------------device/scsi parameters----------------------------------*/ + struct scsi_link *sc_link; /* our link to the adpter etc. */ +/*--------------------parameters reported by the device ----------------------*/ + int blkmin; /* min blk size */ + int blkmax; /* max blk size */ + struct quirkdata *quirkdata; /* if we have a rogue entry */ +/*--------------------parameters reported by the device for this media--------*/ + u_long numblks; /* nominal blocks capacity */ + int media_blksize; /* 0 if not ST_FIXEDBLOCKS */ + u_int8_t media_density; /* this is what it said when asked */ +/*--------------------quirks for the whole drive------------------------------*/ + u_int drive_quirks; /* quirks of this drive */ +/*--------------------How we should set up when opening each minor device----*/ + struct modes modes[4]; /* 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 +/*--------------------storage for sense data returned by the drive------------*/ + u_char sense_data[MAX_PAGE_0_SIZE]; /* + * additional sense data needed + * for mode sense/select. + */ + struct buf buf_queue; /* the queue of pending IO operations */ +}; + +int stmatch __P((struct device *, void *, void *)); +void stattach __P((struct device *, struct device *, void *)); + +struct cfdriver stcd = { + NULL, "st", stmatch, stattach, DV_TAPE, sizeof(struct st_softc) +}; + +int st_space __P((struct st_softc *, int number, u_int what, int flags)); +int st_rewind __P((struct st_softc *, u_int immediate, int flags)); +int st_mode_sense __P((struct st_softc *, int flags)); +int st_decide_mode __P((struct st_softc *, boolean first_read)); +int st_read_block_limits __P((struct st_softc *, int flags)); +int st_touch_tape __P((struct st_softc *)); +int st_write_filemarks __P((struct st_softc *, int number, int flags)); +int st_load __P((struct st_softc *, u_int type, int flags)); +int st_mode_select __P((struct st_softc *, int flags)); +void ststrategy(); +int st_check_eod(); +void ststart(); +void st_unmount(); +int st_mount_tape(); +void st_loadquirks(); +void st_identify_drive(); +int st_interpret_sense(); + +struct scsi_device st_switch = { + st_interpret_sense, + ststart, + NULL, + NULL, +}; + +#define ST_INFO_VALID 0x0001 +#define ST_BLOCK_SET 0x0002 /* block size, mode set by ioctl */ +#define ST_WRITTEN 0x0004 /* data have been written, EOD needed */ +#define ST_FIXEDBLOCKS 0x0008 +#define ST_AT_FILEMARK 0x0010 +#define ST_EIO_PENDING 0x0020 /* we couldn't report it then (had data) */ +#define ST_NEW_MOUNT 0x0040 /* still need to decide mode */ +#define ST_READONLY 0x0080 /* st_mode_sense says write protected */ +#define ST_FM_WRITTEN 0x0100 /* + * EOF file mark written -- used with + * ~ST_WRITTEN to indicate that multiple file + * marks have been written + */ +#define ST_BLANK_READ 0x0200 /* BLANK CHECK encountered already */ +#define ST_2FM_AT_EOD 0x0400 /* write 2 file marks at EOD */ +#define ST_MOUNTED 0x0800 /* Device is presently mounted */ + +#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) + +struct scsi_inquiry_pattern st_patterns[] = { + {T_SEQUENTIAL, T_REMOV, + "", "", ""}, +}; + +int +stmatch(parent, match, aux) + struct device *parent; + void *match, *aux; +{ + struct cfdata *cf = match; + struct scsibus_attach_args *sa = aux; + int priority; + + (void)scsi_inqmatch(sa->sa_inqbuf, + (caddr_t)st_patterns, sizeof(st_patterns)/sizeof(st_patterns[0]), + sizeof(st_patterns[0]), &priority); + return (priority); +} + +/* + * The routine called by the low level scsi routine when it discovers + * A device suitable for this driver + */ +void +stattach(parent, self, aux) + struct device *parent, *self; + void *aux; +{ + struct st_softc *st = (void *)self; + struct scsibus_attach_args *sa = aux; + struct scsi_link *sc_link = sa->sa_sc_link; + + SC_DEBUG(sc_link, SDEV_DB2, ("stattach: ")); + + /* + * Store information needed to contact our base driver + */ + st->sc_link = sc_link; + sc_link->device = &st_switch; + sc_link->device_softc = st; + sc_link->openings = 1; + + /* + * Check if the drive is a known criminal and take + * Any steps needed to bring it into line + */ + st_identify_drive(st, sa->sa_inqbuf); + + /* + * Use the subdriver to request information regarding + * the drive. We cannot use interrupts yet, so the + * request must specify this. + */ + printf(": %s", st->quirkdata ? "rogue, " : ""); + if (scsi_test_unit_ready(sc_link, + SCSI_AUTOCONF | SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE) || + st_mode_sense(st, + SCSI_AUTOCONF | SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE)) + printf("drive empty\n"); + else { + printf("density code 0x%x, ", st->media_density); + if (st->media_blksize > 0) + printf("%d-byte", st->media_blksize); + else + printf("variable"); + printf(" blocks, write-%s\n", + (st->flags & ST_READONLY) ? "protected" : "enabled"); + } + + /* + * Set up the buf queue for this device + */ + st->buf_queue.b_active = 0; + st->buf_queue.b_actf = 0; + st->buf_queue.b_actb = &st->buf_queue.b_actf; +} + +/* + * Use the inquiry routine in 'scsi_base' to get drive info so we can + * Further tailor our behaviour. + */ +void +st_identify_drive(st, inqbuf) + struct st_softc *st; + struct scsi_inquiry_data *inqbuf; +{ + struct st_quirk_inquiry_pattern *finger; + int priority; + + finger = (struct st_quirk_inquiry_pattern *)scsi_inqmatch(inqbuf, + (caddr_t)st_quirk_patterns, + sizeof(st_quirk_patterns)/sizeof(st_quirk_patterns[0]), + sizeof(st_quirk_patterns[0]), &priority); + if (priority != 0) { + st->quirkdata = &finger->quirkdata; + st->drive_quirks = finger->quirkdata.quirks; + st->quirks = finger->quirkdata.quirks; /* start value */ + st->page_0_size = finger->quirkdata.page_0_size; + st_loadquirks(st); + } +} + +/* + * initialise the subdevices to the default (QUIRK) state. + * this will remove any setting made by the system operator or previous + * operations. + */ +void +st_loadquirks(st) + struct st_softc *st; +{ + int i; + struct modes *mode; + struct modes *mode2; + + mode = st->quirkdata->modes; + mode2 = st->modes; + for (i = 0; i < 4; i++) { + bzero(mode2, sizeof(struct modes)); + st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK | + DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER | + DENSITY_SET_BY_USER); + if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_BLKSIZE) { + mode2->blksize = mode->blksize; + 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. + */ +int +stopen(dev, flags) + dev_t dev; + int flags; +{ + int unit; + u_int mode, dsty; + int error = 0; + struct st_softc *st; + struct scsi_link *sc_link; + + unit = STUNIT(dev); + if (unit >= stcd.cd_ndevs) + return ENXIO; + st = stcd.cd_devs[unit]; + if (!st) + return ENXIO; + + mode = STMODE(dev); + dsty = STDSTY(dev); + sc_link = st->sc_link; + + SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev, + unit, stcd.cd_ndevs)); + + /* + * Only allow one at a time + */ + if (sc_link->flags & SDEV_OPEN) { + printf("%s: already open\n", st->sc_dev.dv_xname); + return EBUSY; + } + + /* + * Catch any unit attention errors. + */ + if (error = scsi_test_unit_ready(sc_link, + SCSI_IGNORE_MEDIA_CHANGE | (mode == CTLMODE ? SCSI_IGNORE_NOT_READY : 0))) + goto bad; + + 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 opened to set defaults + * This mode does NOT ALLOW I/O, only ioctls + */ + if (mode == CTLMODE) + return 0; + + /* + * 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(st, 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; + + SC_DEBUG(sc_link, SDEV_DB2, ("open complete\n")); + return 0; + +bad: + st_unmount(st, NOEJECT); + sc_link->flags &= ~SDEV_OPEN; + return error; +} + +/* + * close the device.. only called if we are the LAST + * occurence of an open device + */ +int +stclose(dev) + dev_t dev; +{ + struct st_softc *st = stcd.cd_devs[STUNIT(dev)]; + + SC_DEBUG(st->sc_link, SDEV_DB1, ("closing\n")); + if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) + st_write_filemarks(st, 1, 0); + switch (STMODE(dev)) { + case 0: + case 3: /* for now */ + st_unmount(st, NOEJECT); + break; + case 1: + /* leave mounted unless media seems to have been removed */ + if (!(st->sc_link->flags & SDEV_MEDIA_LOADED)) + st_unmount(st, NOEJECT); + break; + case 2: + st_unmount(st, EJECT); + break; + } + st->sc_link->flags &= ~SDEV_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. + */ +int +st_mount_tape(dev, flags) + dev_t dev; + int flags; +{ + int unit; + u_int mode, dsty; + struct st_softc *st; + struct scsi_link *sc_link; + int error = 0; + + unit = STUNIT(dev); + mode = STMODE(dev); + dsty = STDSTY(dev); + st = stcd.cd_devs[unit]; + sc_link = st->sc_link; + + 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 (error = st_load(st, LD_LOAD, 0)) + return error; + /* + * 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); /* XXX */ + + /* + * 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_SENSE_HELP) + if (error = st_touch_tape(st)) + return error; + /* + * Load the physical device parameters + * loads: blkmin, blkmax + */ + if (error = st_read_block_limits(st, 0)) + return error; + /* + * Load the media dependent parameters + * includes: media_blksize,media_density,numblks + * As we have a tape in, it should be reflected here. + * If not you may need the "quirk" above. + */ + if (error = st_mode_sense(st, 0)) + return error; + /* + * 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->blksize = st->modes[dsty].blksize; + if (st->blksize) + st->flags |= ST_FIXEDBLOCKS; + } else { + if (error = st_decide_mode(st, FALSE)) + return error; + } + if (error = st_mode_select(st, 0)) { + printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); + return error; + } + scsi_prevent(sc_link, PR_PREVENT, + SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); + st->flags &= ~ST_NEW_MOUNT; + st->flags |= ST_MOUNTED; + sc_link->flags |= SDEV_MEDIA_LOADED; /* move earlier? */ + + 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(st, eject) + struct st_softc *st; + boolean eject; +{ + struct scsi_link *sc_link = st->sc_link; + int nmarks; + + if (!(st->flags & ST_MOUNTED)) + return; + SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n")); + st_check_eod(st, FALSE, &nmarks, SCSI_IGNORE_NOT_READY); + st_rewind(st, 0, SCSI_IGNORE_NOT_READY); + scsi_prevent(sc_link, PR_ALLOW, + SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); + if (eject) + st_load(st, LD_UNLOAD, SCSI_IGNORE_NOT_READY); + 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) + */ +int +st_decide_mode(st, first_read) + struct st_softc *st; + boolean first_read; +{ +#ifdef SCSIDEBUG + struct scsi_link *sc_link = st->sc_link; +#endif + + SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n")); + + /* + * 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->blksize = st->blkmin; + SC_DEBUG(sc_link, SDEV_DB3, + ("blkmin == blkmax of %d\n", st->blkmin)); + goto done; + } + /* + * If the tape density mandates (or even suggests) use of fixed + * or variable-length blocks, comply. + */ + switch (st->density) { + case HALFINCH_800: + case HALFINCH_1600: + case HALFINCH_6250: + case DDS: + st->flags &= ~ST_FIXEDBLOCKS; + st->blksize = 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: + case QIC_525: + case QIC_1320: + st->flags |= ST_FIXEDBLOCKS; + if (st->media_blksize > 0) + st->blksize = st->media_blksize; + else + st->blksize = 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_BLKSIZE) || (st->media_blksize == 0) || + (st->media_blksize == DEF_FIXED_BSIZE) || + (st->media_blksize == 1024))) { + if (st->media_blksize > 0) + st->flags |= ST_FIXEDBLOCKS; + else + st->flags &= ~ST_FIXEDBLOCKS; + st->blksize = st->media_blksize; + SC_DEBUG(sc_link, SDEV_DB3, + ("Used media_blksize of %d\n", st->media_blksize)); + goto done; + } + /* + * We're getting no hints from any direction. Choose variable- + * length blocks arbitrarily. + */ + st->flags &= ~ST_FIXEDBLOCKS; + st->blksize = 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 (st->density) { +/* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ + case QIC_11: + case QIC_24: + case QIC_120: + case QIC_150: + case QIC_525: + case QIC_1320: + st->flags &= ~ST_2FM_AT_EOD; + break; + default: + st->flags |= ST_2FM_AT_EOD; + } + 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. + */ +void +ststrategy(bp) + struct buf *bp; +{ + struct st_softc *st = stcd.cd_devs[STUNIT(bp->b_dev)]; + struct buf *dp; + int s; + + SC_DEBUG(st->sc_link, SDEV_DB1, + ("ststrategy %d bytes @ blk %d\n", bp->b_bcount, bp->b_blkno)); + /* + * If it's a null transfer, return immediatly + */ + if (bp->b_bcount == 0) + goto done; + /* + * Odd sized request on fixed drives are verboten + */ + if (st->flags & ST_FIXEDBLOCKS) { + if (bp->b_bcount % st->blksize) { + printf("%s: bad request, must be multiple of %d\n", + st->sc_dev.dv_xname, st->blksize); + bp->b_error = EIO; + goto bad; + } + } + /* + * as are out-of-range requests on variable drives. + */ + else if (bp->b_bcount < st->blkmin || + (st->blkmax && bp->b_bcount > st->blkmax)) { + printf("%s: bad request, must be between %d and %d\n", + st->sc_dev.dv_xname, st->blkmin, st->blkmax); + bp->b_error = EIO; + goto bad; + } + s = splbio(); + + /* + * Place it in the queue of activities for this tape + * at the end (a bit silly because we only have on user.. + * (but it could fork())) + */ + dp = &st->buf_queue; + bp->b_actf = NULL; + bp->b_actb = dp->b_actb; + *dp->b_actb = bp; + dp->b_actb = &bp->b_actf; + + /* + * 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(st); + + splx(s); + return; +bad: + bp->b_flags |= B_ERROR; +done: + /* + * Correctly set the buf to indicate a completed xfer + */ + iodone(bp); + return; +} + +/* + * ststart looks to see if there is a buf waiting for the device + * and that the device is not already busy. If both are true, + * It 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 + */ +void +ststart(st) + struct st_softc *st; +{ + struct scsi_link *sc_link = st->sc_link; + register struct buf *bp, *dp; + struct scsi_rw_tape cmd; + int flags; + + 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->openings > 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.b_actf; + if (!bp) + return; /* no work to bother with */ + if (dp = bp->b_actf) + dp->b_actb = bp->b_actb; + else + st->buf_queue.b_actb = bp->b_actb; + *bp->b_actb = dp; + + /* + * if the device has been unmounted byt 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; + bp->b_flags |= B_ERROR; + bp->b_error = EIO; + biodone(bp); + continue; + } + /* + * 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(st, 0, SP_FILEMARKS, 0)) { + bp->b_flags |= B_ERROR; + bp->b_error = EIO; + biodone(bp); + continue; + } + } 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.opcode = WRITE; + st->flags &= ~ST_FM_WRITTEN; + st->flags |= ST_WRITTEN; + flags = SCSI_DATA_OUT; + } else { + cmd.opcode = READ; + 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 |= SRW_FIXED; + lto3b(bp->b_bcount / st->blksize, cmd.len); + } else + lto3b(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, + 100000, bp, flags | SCSI_NOSLEEP)) + printf("%s: not queued\n", st->sc_dev.dv_xname); + } /* go back and see if we can cram more work in.. */ +} + +int +stread(dev, uio) + dev_t dev; + struct uio *uio; +{ + struct st_softc *st = stcd.cd_devs[STUNIT(dev)]; + + return (physio(ststrategy, NULL, dev, B_READ, + st->sc_link->adapter->scsi_minphys, uio)); +} + +int +stwrite(dev, uio) + dev_t dev; + struct uio *uio; +{ + struct st_softc *st = stcd.cd_devs[STUNIT(dev)]; + + return (physio(ststrategy, NULL, dev, B_WRITE, + st->sc_link->adapter->scsi_minphys, uio)); +} + +/* + * Perform special action on behalf of the user; + * knows about the internals of this device + */ +int +stioctl(dev, cmd, arg, flag, p) + dev_t dev; + u_long cmd; + caddr_t arg; + int flag; + struct proc *p; +{ + int error = 0; + int unit; + int number, nmarks, dsty; + int flags; + struct st_softc *st; + int hold_blksize; + u_int8_t hold_density; + 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 = STDSTY(dev); + st = stcd.cd_devs[unit]; + hold_blksize = st->blksize; + hold_density = st->density; + + switch (cmd) { + + case MTIOCGET: { + struct mtget *g = (struct mtget *) arg; + + SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: get status]\n")); + bzero(g, sizeof(struct mtget)); + g->mt_type = 0x7; /* Ultrix compat *//*? */ + g->mt_blksiz = st->blksize; + g->mt_density = st->density; + g->mt_mblksiz[0] = st->modes[0].blksize; + g->mt_mblksiz[1] = st->modes[1].blksize; + g->mt_mblksiz[2] = st->modes[2].blksize; + g->mt_mblksiz[3] = st->modes[3].blksize; + g->mt_mdensity[0] = st->modes[0].density; + g->mt_mdensity[1] = st->modes[1].density; + g->mt_mdensity[2] = st->modes[2].density; + g->mt_mdensity[3] = st->modes[3].density; + break; + } + case MTIOCTOP: { + + SC_DEBUG(st->sc_link, SDEV_DB1, + ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, mt->mt_count)); + + /* compat: in U*x it is a short */ + number = mt->mt_count; + switch ((short) (mt->mt_op)) { + case MTWEOF: /* write an end-of-file record */ + error = st_write_filemarks(st, number, flags); + break; + case MTBSF: /* backward space file */ + number = -number; + case MTFSF: /* forward space file */ + error = st_check_eod(st, FALSE, &nmarks, flags); + if (!error) + error = st_space(st, number - nmarks, + SP_FILEMARKS, flags); + break; + case MTBSR: /* backward space record */ + number = -number; + case MTFSR: /* forward space record */ + error = st_check_eod(st, TRUE, &nmarks, flags); + if (!error) + error = st_space(st, number, SP_BLKS, flags); + break; + case MTREW: /* rewind */ + error = st_rewind(st, 0, flags); + break; + case MTOFFL: /* rewind and put the drive offline */ + st_unmount(st, EJECT); + break; + case MTNOP: /* no operation, sets status only */ + break; + case MTRETEN: /* retension the tape */ + error = st_load(st, LD_RETENSION, flags); + if (!error) + error = st_load(st, LD_LOAD, flags); + break; + case MTEOM: /* forward space to end of media */ + error = st_check_eod(st, FALSE, &nmarks, flags); + if (!error) + error = st_space(st, 1, SP_EOM, flags); + break; + 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"); + error = EINVAL; + break; + } +#endif + if (number == 0) { + st->flags &= ~ST_FIXEDBLOCKS; + } else { + if ((st->blkmin || st->blkmax) && + (number < st->blkmin || + number > st->blkmax)) { + error = EINVAL; + break; + } + st->flags |= ST_FIXEDBLOCKS; + } + st->blksize = number; + st->flags |= ST_BLOCK_SET; /*XXX */ + goto try_new_value; + + case MTSETDNSTY: /* Set density for device and mode */ + if (number > SCSI_2_MAX_DENSITY_CODE) + error = EINVAL; + else + st->density = number; + goto try_new_value; + + default: + error = EINVAL; + } + break; + } + case MTIOCIEOT: + case MTIOCEEOT: + break; + default: + if (STMODE(dev) == CTLMODE) + error = scsi_do_ioctl(st->sc_link, dev, cmd, arg, flag, p); + else + error = ENOTTY; + break; + } + return error; +/*-----------------------------*/ +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 (error = st_mode_select(st, 0)) { /* put it back as it was */ + printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); + st->density = hold_density; + st->blksize = hold_blksize; + if (st->blksize) + st->flags |= ST_FIXEDBLOCKS; + else + st->flags &= ~ST_FIXEDBLOCKS; + return error; + } + /* + * 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 (STMODE(dev) == 0x03) { + /* special mode */ + /* XXX */ + switch ((short) (mt->mt_op)) { + case MTSETBSIZ: + st->modes[dsty].blksize = st->blksize; + 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. + */ +int +st_read(st, buf, size, flags) + struct st_softc *st; + int size; + int flags; + char *buf; +{ + struct scsi_rw_tape cmd; + + /* + * If it's a null transfer, return immediatly + */ + if (size == 0) + return 0; + bzero(&cmd, sizeof(cmd)); + cmd.opcode = READ; + if (st->flags & ST_FIXEDBLOCKS) { + cmd.byte2 |= SRW_FIXED; + lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE), + cmd.len); + } else + lto3b(size, cmd.len); + return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, + sizeof(cmd), (u_char *) buf, size, 0, 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. + */ +int +st_read_block_limits(st, flags) + struct st_softc *st; + int flags; +{ + struct scsi_block_limits cmd; + struct scsi_block_limits_data block_limits; + struct scsi_link *sc_link = st->sc_link; + int error; + + /* + * First check if we have it all loaded + */ + if ((sc_link->flags & SDEV_MEDIA_LOADED)) + return 0; + + /* + * do a 'Read Block Limits' + */ + bzero(&cmd, sizeof(cmd)); + cmd.opcode = READ_BLOCK_LIMITS; + + /* + * do the command, update the global values + */ + if (error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, + sizeof(cmd), (u_char *) &block_limits, sizeof(block_limits), + ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN)) + return error; + + st->blkmin = b2tol(block_limits.min_length); + st->blkmax = _3btol(&block_limits.max_length_2); + + SC_DEBUG(sc_link, SDEV_DB3, + ("(%d <= blksize <= %d)\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) + */ +int +st_mode_sense(st, flags) + struct st_softc *st; + int flags; +{ + u_int scsi_sense_len; + int error; + struct scsi_mode_sense cmd; + struct scsi_sense { + struct scsi_mode_header header; + struct scsi_blk_desc blk_desc; + u_char sense_data[MAX_PAGE_0_SIZE]; + } scsi_sense; + struct scsi_link *sc_link = st->sc_link; + + scsi_sense_len = 12 + st->page_0_size; + + /* + * Set up a mode sense + */ + bzero(&cmd, sizeof(cmd)); + cmd.opcode = MODE_SENSE; + cmd.length = scsi_sense_len; + + /* + * do the command, but we don't need the results + * just print them for our interest's sake, if asked, + * or if we need it as a template for the mode select + * store it away. + */ + if (error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, + sizeof(cmd), (u_char *) &scsi_sense, scsi_sense_len, + ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN)) + return error; + + st->numblks = _3btol(scsi_sense.blk_desc.nblocks); + st->media_blksize = _3btol(scsi_sense.blk_desc.blklen); + st->media_density = scsi_sense.blk_desc.density; + if (scsi_sense.header.dev_spec & SMH_DSP_WRITE_PROT) + st->flags |= ST_READONLY; + SC_DEBUG(sc_link, SDEV_DB3, + ("density code 0x%x, %d-byte blocks, write-%s, ", + st->media_density, st->media_blksize, + st->flags & ST_READONLY ? "protected" : "enabled")); + SC_DEBUG(sc_link, SDEV_DB3, + ("%sbuffered\n", + scsi_sense.header.dev_spec & SMH_DSP_BUFF_MODE ? "" : "un")); + if (st->page_0_size) + bcopy(scsi_sense.sense_data, st->sense_data, st->page_0_size); + sc_link->flags |= SDEV_MEDIA_LOADED; + return 0; +} + +/* + * Send a filled out parameter structure to the drive to + * set it into the desire modes etc. + */ +int +st_mode_select(st, flags) + struct st_softc *st; + int flags; +{ + u_int scsi_select_len; + int error; + struct scsi_mode_select cmd; + struct scsi_select { + struct scsi_mode_header header; + struct scsi_blk_desc blk_desc; + u_char sense_data[MAX_PAGE_0_SIZE]; + } scsi_select; + struct scsi_link *sc_link = st->sc_link; + + scsi_select_len = 12 + st->page_0_size; + + /* + * Set up for a mode select + */ + bzero(&cmd, sizeof(cmd)); + cmd.opcode = MODE_SELECT; + cmd.length = scsi_select_len; + + bzero(&scsi_select, scsi_select_len); + scsi_select.header.blk_desc_len = sizeof(struct scsi_blk_desc); + scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_ON; + scsi_select.blk_desc.density = st->density; + if (st->flags & ST_FIXEDBLOCKS) + lto3b(st->blksize, scsi_select.blk_desc.blklen); + if (st->page_0_size) + bcopy(st->sense_data, scsi_select.sense_data, st->page_0_size); + + /* + * do the command + */ + return scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, + sizeof(cmd), (u_char *) &scsi_select, scsi_select_len, + ST_RETRIES, 5000, NULL, flags | SCSI_DATA_OUT); +} + +/* + * skip N blocks/filemarks/seq filemarks/eom + */ +int +st_space(st, number, what, flags) + struct st_softc *st; + u_int what; + int flags; + int number; +{ + struct scsi_space cmd; + int error; + + switch (what) { + case SP_BLKS: + if (st->flags & ST_PER_ACTION) { + if (number > 0) { + st->flags &= ~ST_PER_ACTION; + return EIO; + } else if (number < 0) { + if (st->flags & ST_AT_FILEMARK) { + /* + * Handling of ST_AT_FILEMARK + * in st_space will fill in the + * right file mark count. + */ + error = st_space(st, 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 discovered 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++; /* XXX dubious */ + } + break; + case SP_EOM: + if (st->flags & ST_EIO_PENDING) { + /* pretend we just discovered the error */ + st->flags &= ~ST_EIO_PENDING; + return EIO; + } + if (st->flags & ST_AT_FILEMARK) + st->flags &= ~ST_AT_FILEMARK; + break; + } + if (number == 0) + return 0; + + bzero(&cmd, sizeof(cmd)); + cmd.opcode = SPACE; + cmd.byte2 = what; + lto3b(number, cmd.number); + + return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, + sizeof(cmd), 0, 0, 0, 900000, NULL, flags); +} + +/* + * write N filemarks + */ +int +st_write_filemarks(st, number, flags) + struct st_softc *st; + int flags; + int number; +{ + struct scsi_write_filemarks cmd; + + /* + * It's hard to write a negative number of file marks. + * Don't try. + */ + if (number < 0) + return EINVAL; + switch (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(&cmd, sizeof(cmd)); + cmd.opcode = WRITE_FILEMARKS; + lto3b(number, cmd.number); + + return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, + sizeof(cmd), 0, 0, 0, 100000, 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. + */ +int +st_check_eod(st, position, nmarks, flags) + struct st_softc *st; + boolean position; + int *nmarks; + int flags; +{ + int error; + + switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) { + default: + *nmarks = 0; + return 0; + 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(st, *nmarks, flags); + if (position && !error) + error = st_space(st, -*nmarks, SP_FILEMARKS, flags); + return error; +} + +/* + * load/unload/retension + */ +int +st_load(st, type, flags) + struct st_softc *st; + u_int type; + int flags; +{ + struct scsi_load cmd; + + if (type != LD_LOAD) { + int error; + int nmarks; + + error = st_check_eod(st, FALSE, &nmarks, flags); + if (error) + return error; + } + if (st->quirks & ST_Q_IGNORE_LOADS) + return 0; + + bzero(&cmd, sizeof(cmd)); + cmd.opcode = LOAD; + cmd.how = type; + + return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, + sizeof(cmd), 0, 0, ST_RETRIES, 300000, NULL, flags); +} + +/* + * Rewind the device + */ +int +st_rewind(st, immediate, flags) + struct st_softc *st; + u_int immediate; + int flags; +{ + struct scsi_rewind cmd; + int error; + int nmarks; + + error = st_check_eod(st, FALSE, &nmarks, flags); + if (error) + return error; + st->flags &= ~ST_PER_ACTION; + + bzero(&cmd, sizeof(cmd)); + cmd.opcode = REWIND; + cmd.byte2 = immediate; + + return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, + sizeof(cmd), 0, 0, ST_RETRIES, immediate ? 5000 : 300000, 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) + * (-1 = continue processing) + */ +int +st_interpret_sense(xs) + struct scsi_xfer *xs; +{ + struct scsi_link *sc_link = xs->sc_link; + struct scsi_sense_data *sense = &xs->sense; + struct buf *bp = xs->bp; + struct st_softc *st = sc_link->device_softc; + u_int8_t key; + u_int32_t info; + + /* + * Get the sense fields and work out what code + */ + if (sense->error_code & SSD_ERRCODE_VALID) { + bcopy(sense->extended_info, &info, sizeof info); + info = ntohl(info); + } else + info = xs->datalen; /* bad choice if fixed blocks */ + if ((sense->error_code & SSD_ERRCODE) != 0x70) + return -1; /* let the generic code handle it */ + if (st->flags & ST_FIXEDBLOCKS) { + xs->resid = info * st->blksize; + if (sense->extended_flags & SSD_EOM) { + st->flags |= ST_EIO_PENDING; + if (bp) + bp->b_resid = xs->resid; + } + if (sense->extended_flags & SSD_FILEMARK) { + st->flags |= ST_AT_FILEMARK; + if (bp) + bp->b_resid = xs->resid; + } + if (sense->extended_flags & SSD_ILI) { + st->flags |= ST_EIO_PENDING; + if (bp) + bp->b_resid = xs->resid; + if (sense->error_code & SSD_ERRCODE_VALID && + (xs->flags & SCSI_SILENT) == 0) + printf("%s: block wrong size, %d blocks residual\n", + st->sc_dev.dv_xname, info); + + /* + * This quirk code helps the drive read + * the first tape block, regardless of + * format. That is required for these + * drives to return proper MODE SENSE + * information. + */ + if ((st->quirks & ST_Q_SENSE_HELP) && + !(sc_link->flags & SDEV_MEDIA_LOADED)) + st->blksize -= 512; + } + /* + * If no data was tranfered, do it immediatly + */ + if (xs->resid >= xs->datalen) { + if (st->flags & ST_EIO_PENDING) + return EIO; + if (st->flags & ST_AT_FILEMARK) { + if (bp) + bp->b_resid = xs->resid; + return 0; + } + } + } else { /* must be variable mode */ + xs->resid = xs->datalen; /* to be sure */ + if (sense->extended_flags & SSD_EOM) + return EIO; + if (sense->extended_flags & SSD_FILEMARK) { + if (bp) + bp->b_resid = bp->b_bcount; + return 0; + } + if (sense->extended_flags & SSD_ILI) { + if (info < 0) { + /* + * the record was bigger than the read + */ + if ((xs->flags & SCSI_SILENT) == 0) + printf("%s: %d-byte record too big\n", + st->sc_dev.dv_xname, + xs->datalen - info); + return EIO; + } + xs->resid = info; + if (bp) + bp->b_resid = info; + } + } + key = sense->extended_flags & SSD_KEY; + + if (key == 0x8) { + /* + * 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_SENSE_HELP) && + !(sc_link->flags & SDEV_MEDIA_LOADED)) { + /* still starting */ + st->blksize -= 512; + } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) { + st->flags |= ST_BLANK_READ; + xs->resid = xs->datalen; + if (bp) { + bp->b_resid = xs->resid; + /* return an EOF */ + } + return 0; + } + } + return -1; /* let the default/generic handler handle it */ +} + +/* + * 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. + */ +int +st_touch_tape(st) + struct st_softc *st; +{ + char *buf; + int readsize; + int error; + + buf = malloc(1024, M_TEMP, M_NOWAIT); + if (!buf) + return ENOMEM; + + if (error = st_mode_sense(st, 0)) + goto bad; + st->blksize = 1024; + do { + switch (st->blksize) { + case 512: + case 1024: + readsize = st->blksize; + st->flags |= ST_FIXEDBLOCKS; + break; + default: + readsize = 1; + st->flags &= ~ST_FIXEDBLOCKS; + } + if (error = st_mode_select(st, 0)) + goto bad; + st_read(st, buf, readsize, SCSI_SILENT); /* XXX */ + if (error = st_rewind(st, 0, 0)) { +bad: free(buf, M_TEMP); + return error; + } + } while (readsize != 1 && readsize > st->blksize); + + free(buf, M_TEMP); + return 0; +} + +int +stdump(dev, blkno, va, size) + dev_t dev; + daddr_t blkno; + caddr_t va; + size_t size; +{ + + /* Not implemented. */ + return ENXIO; +} |