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Diffstat (limited to 'sys/scsi/st.c')
| -rw-r--r-- | sys/scsi/st.c | 1926 |
1 files changed, 1926 insertions, 0 deletions
diff --git a/sys/scsi/st.c b/sys/scsi/st.c new file mode 100644 index 0000000..65a3109 --- /dev/null +++ b/sys/scsi/st.c @@ -0,0 +1,1926 @@ +/* + * 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. + * + * $Id$ + */ + +/* + * 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 <st.h> + +#include <sys/param.h> +#include <sys/systm.h> + +#include <fcntl.h> +#include <sys/errno.h> +#include <sys/ioctl.h> +#include <sys/malloc.h> +#include <sys/buf.h> +#include <sys/proc.h> +#include <sys/user.h> +#include <sys/mtio.h> + +#include <scsi/scsi_all.h> +#include <scsi/scsi_tape.h> +#include <scsi/scsiconf.h> + +u_int32 ststrats, stqueues; + +/* Defines for device specific stuff */ +#define PAGE_0_SENSE_DATA_SIZE 12 +#define PAGESIZ 4096 +#define DEF_FIXED_BSIZE 512 +#define ST_RETRIES 4 /* only on non IO commands */ + +#define MODE(z) ( (minor(z) & 0x03) ) +#define DSTY(z) ( ((minor(z) >> 2) & 0x03) ) +#define UNIT(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_int32 blksiz; + u_int32 quirks; /* same definitions as in rogues */ + char density; + char spare[3]; +}; + +struct rogues { + char *name; + char *manu; + char *model; + char *version; + u_int32 quirks; /* valid for all modes */ + struct modes modes[4]; +}; + +/* define behaviour codes (quirks) */ +#define ST_Q_NEEDS_PAGE_0 0x00001 +#define ST_Q_FORCE_FIXED_MODE 0x00002 +#define ST_Q_FORCE_VAR_MODE 0x00004 +#define ST_Q_SNS_HLP 0x00008 /* must do READ for good MODE SENSE */ +#define ST_Q_IGNORE_LOADS 0x00010 +#define ST_Q_BLKSIZ 0x00020 /* variable-block media_blksiz > 0 */ + +static struct rogues gallery[] = /* ends with an all-null entry */ +{ + {"Such an old device ", "pre-scsi", " unknown model ", "????", + 0, + { + {512, ST_Q_FORCE_FIXED_MODE, 0}, /* minor 0,1,2,3 */ + {512, ST_Q_FORCE_FIXED_MODE, QIC_24}, /* minor 4,5,6,7 */ + {0, ST_Q_FORCE_VAR_MODE, HALFINCH_1600}, /* minor 8,9,10,11 */ + {0, ST_Q_FORCE_VAR_MODE, HALFINCH_6250} /* minor 12,13,14,15 */ + } + }, + {"Tandberg tdc3600", "TANDBERG", " TDC 3600", "????", + ST_Q_NEEDS_PAGE_0, + { + {0, 0, 0}, /* minor 0,1,2,3 */ + {0, ST_Q_FORCE_VAR_MODE, QIC_525}, /* minor 4,5,6,7 */ + {0, 0, QIC_150}, /* minor 8,9,10,11 */ + {0, 0, QIC_120} /* minor 12,13,14,15 */ + } + }, + {"Rev 5 of the Archive 2525", "ARCHIVE ", "VIPER 2525 25462", "-005", + 0, + { + {0, ST_Q_SNS_HLP, 0}, /* minor 0,1,2,3 */ + {0, ST_Q_SNS_HLP, QIC_525}, /* minor 4,5,6,7 */ + {0, 0, QIC_150}, /* minor 8,9,10,11 */ + {0, 0, QIC_120} /* minor 12,13,14,15 */ + } + }, + {"Archive Viper 150", "ARCHIVE ", "VIPER 150", "????", + ST_Q_NEEDS_PAGE_0, + { + {0, 0, 0}, /* minor 0,1,2,3 */ + {0, 0, QIC_150}, /* minor 4,5,6,7 */ + {0, 0, QIC_120}, /* minor 8,9,10,11 */ + {0, 0, QIC_24} /* minor 12,13,14,15 */ + } + }, + {"Wangtek 5525ES", "WANGTEK ", "5525ES SCSI REV7", "????", + 0, + { + {0, 0, 0}, /* minor 0,1,2,3 */ + {0, ST_Q_BLKSIZ, QIC_525}, /* minor 4,5,6,7 */ + {0, 0, QIC_150}, /* minor 8,9,10,11 */ + {0, 0, QIC_120} /* minor 12,13,14,15 */ + } + }, + {"WangDAT model 1300", "WangDAT ", "Model 1300", "????", + 0, + { + {0, 0, 0}, /* minor 0,1,2,3 */ + {512, ST_Q_FORCE_FIXED_MODE, 0x13}, /* minor 4,5,6,7 */ + {1024, ST_Q_FORCE_FIXED_MODE, 0x13}, /* minor 8,9,10,11 */ + {0, ST_Q_FORCE_VAR_MODE, 0x13} /* minor 12,13,14,15 */ + } + }, + {(char *) 0} +}; + +errval st_space __P((u_int32 unit, int32 number, u_int32 what, u_int32 flags)); +errval st_rewind __P((u_int32 unit, boolean immed, u_int32 flags)); +errval st_mode_sense __P((u_int32 unit, u_int32 flags)); +errval st_decide_mode __P((u_int32 unit, boolean first_read)); +errval st_rd_blk_lim __P((u_int32 unit, u_int32 flags)); +errval st_touch_tape __P((u_int32 unit)); +errval st_write_filemarks __P((u_int32 unit, int32 number, u_int32 flags)); +errval st_load __P((u_int32 unit, u_int32 type, u_int32 flags)); +errval st_mode_select __P((u_int32 unit, u_int32 flags)); +void ststrategy(); +void stminphys(); +int32 st_chkeod(); +errval stattach(); +void ststart(); +void st_unmount(); +errval st_mount_tape(); +void st_loadquirks(); +void st_identify_drive(); +errval st_interpret_sense(); + +#define ESUCCESS 0 +#define NOEJECT 0 +#define EJECT 1 + +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 } +}; + +struct st_data { +/*--------------------present operating parameters, flags etc.----------------*/ + u_int32 flags; /* see below */ + u_int32 blksiz; /* blksiz we are using */ + u_int32 density; /* present density */ + u_int32 quirks; /* quirks for the open mode */ + u_int32 last_dsty; /* last density openned */ +/*--------------------device/scsi parameters----------------------------------*/ + struct scsi_link *sc_link; /* our link to the adpter etc. */ +/*--------------------parameters reported by the device ----------------------*/ + u_int32 blkmin; /* min blk size */ + u_int32 blkmax; /* max blk size */ + struct rogues *rogues; /* if we have a rogue entry */ +/*--------------------parameters reported by the device for this media--------*/ + u_int32 numblks; /* nominal blocks capacity */ + u_int32 media_blksiz; /* 0 if not ST_FIXEDBLOCKS */ + u_int32 media_density; /* this is what it said when asked */ +/*--------------------quirks for the whole drive------------------------------*/ + u_int32 drive_quirks; /* quirks of this drive */ +/*--------------------How we should set up when openning each minor device----*/ + struct modes modes[4]; /* plus more for each mode */ + u_int8 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------------*/ + unsigned char sense_data[12]; /* + * additional sense data needed + * for mode sense/select. + */ + struct buf *buf_queue; /* the queue of pending IO operations */ + struct scsi_xfer scsi_xfer; /* scsi xfer struct for this drive */ + u_int32 xfer_block_wait; /* is a process waiting? */ +} *st_data[NST]; + +#define ST_INITIALIZED 0x01 +#define ST_INFO_VALID 0x02 +#define ST_OPEN 0x04 +#define ST_BLOCK_SET 0x08 /* block size, mode set by ioctl */ +#define ST_WRITTEN 0x10 /* data have been written, EOD needed */ +#define ST_FIXEDBLOCKS 0x20 +#define ST_AT_FILEMARK 0x40 +#define ST_EIO_PENDING 0x80 /* we couldn't report it then (had data) */ +#define ST_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_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ) +#define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \ + ST_FIXEDBLOCKS | ST_READONLY | \ + ST_FM_WRITTEN | ST_2FM_AT_EOD | ST_PER_ACTION) + +static u_int32 next_st_unit = 0; + +/* + * The routine called by the low level scsi routine when it discovers + * A device suitable for this driver + */ + +errval +stattach(sc_link) + struct scsi_link *sc_link; +{ + u_int32 unit; + struct st_data *st; + + SC_DEBUG(sc_link, SDEV_DB2, ("stattach: ")); + /* + * Check we have the resources for another drive + */ + unit = next_st_unit++; + + if (unit >= NST) { + printf("Too many scsi tapes..(%d > %d) reconfigure kernel\n", + (unit + 1), NST); + return 0; + } + if (st_data[unit]) { + printf("st%d: Already has storage!\n", unit); + return 0; + } + sc_link->device = &st_switch; + sc_link->dev_unit = unit; + st = st_data[unit] = malloc(sizeof(struct st_data), M_DEVBUF, M_NOWAIT); + if (!st) { + printf("st%d: malloc failed in st.c\n", unit); + return 0; + } + bzero(st, sizeof(struct st_data)); + + /* + * Store information needed to contact our base driver + */ + st->sc_link = sc_link; + + /* + * Check if the drive is a known criminal and take + * Any steps needed to bring it into line + */ + st_identify_drive(unit); + + /* + * Use the subdriver to request information regarding + * the drive. We cannot use interrupts yet, so the + * request must specify this. + */ + if (st_mode_sense(unit, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT)) { + printf("st%d: drive offline\n", unit); + } else { + printf("st%d: density code 0x%x, ", unit, st->media_density); + if (!scsi_test_unit_ready(sc_link, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT)) { + if (st->media_blksiz) { + printf("%d-byte", st->media_blksiz); + } else { + printf("variable"); + } + printf(" blocks, write-%s\n", + (st->flags & ST_READONLY) ? "protected" : "enabled"); + } else { + printf(" drive empty\n"); + } + } + /* + * Set up the buf queue for this device + */ + st->buf_queue = 0; + st->flags |= ST_INITIALIZED; + return 0; +} + +/* + * Use the inquiry routine in 'scsi_base' to get drive info so we can + * Further tailor our behaviour. + */ +void +st_identify_drive(unit) + u_int32 unit; +{ + struct st_data *st = st_data[unit]; + struct scsi_inquiry_data inqbuf; + struct rogues *finger; + char manu[32]; + char model[32]; + char model2[32]; + char version[32]; + u_int32 model_len; + + /* + * Get the device type information + */ + if (scsi_inquire(st->sc_link, &inqbuf, + SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT) != 0) { + printf("st%d: couldn't get device type, using default\n", unit); + return; + } + if ((inqbuf.version & SID_ANSII) == 0) { + /* + * If not advanced enough, use default values + */ + strncpy(manu, "pre-scsi", 8); + manu[8] = 0; + strncpy(model, " unknown model ", 16); + model[16] = 0; + strncpy(version, "????", 4); + version[4] = 0; + } else { + strncpy(manu, inqbuf.vendor, 8); + manu[8] = 0; + strncpy(model, inqbuf.product, 16); + model[16] = 0; + strncpy(version, inqbuf.revision, 4); + version[4] = 0; + } + + /* + * Load the parameters for this kind of device, so we + * treat it as appropriate for each operating mode. + * Only check the number of characters in the array's + * model entry, not the entire model string returned. + */ + finger = gallery; + while (finger->name) { + model_len = 0; + while (finger->model[model_len] && (model_len < 32)) { + model2[model_len] = model[model_len]; + model_len++; + } + model2[model_len] = 0; + if ((strcmp(manu, finger->manu) == 0) + && (strcmp(model2, finger->model) == 0 || + strcmp("????????????????", finger->model) == 0) + && (strcmp(version, finger->version) == 0 || + strcmp("????", finger->version) == 0)) { + printf("st%d: %s is a known rogue\n", unit, finger->name); + st->rogues = finger; + st->drive_quirks = finger->quirks; + st->quirks = finger->quirks; /*start value */ + st_loadquirks(st); + break; + } else { + finger++; /* go to next suspect */ + } + } +} + +/* + * 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_data *st; +{ + int i; + struct modes *mode; + struct modes *mode2; + + if (!st->rogues) + return; + mode = st->rogues->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->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. + */ +errval +stopen(dev, flags) + dev_t dev; + u_int32 flags; +{ + u_int32 unit, mode, dsty; + errval errno = 0; + struct st_data *st; + struct scsi_link *sc_link; + unit = UNIT(dev); + mode = MODE(dev); + dsty = DSTY(dev); + + /* + * Check the unit is legal + */ + if (unit >= NST) { + return (ENXIO); + } + st = st_data[unit]; + /* + * Make sure the device has been initialised + */ + if ((st == NULL) || (!(st->flags & ST_INITIALIZED))) + return (ENXIO); + + sc_link = st->sc_link; + SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n" + ,dev, unit, NST)); + /* + * 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 + */ + if (mode == CTLMODE) + 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))) { + printf("st%d: not ready\n", unit); + st_unmount(unit, NOEJECT); + return (errno); + } + /* + * if it's a different mode, or if the media has been + * invalidated, unmount the tape from the previous + * session but continue with open processing + */ + if ((st->last_dsty != dsty) + || (!(sc_link->flags & SDEV_MEDIA_LOADED))) { + st_unmount(unit, NOEJECT); + } + /* + * If we are not mounted, then we should start a new + * mount session. + */ + if (!(st->flags & ST_MOUNTED)) { + st_mount_tape(dev, flags); + st->last_dsty = dsty; + } + /* + * Make sure that a tape opened in write-only mode will have + * file marks written on it when closed, even if not written to. + * This is for SUN compatibility + */ + if ((flags & O_ACCMODE) == FWRITE) + st->flags |= ST_WRITTEN; + + 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 + */ +errval +stclose(dev) + dev_t dev; +{ + unsigned char unit, mode; + struct st_data *st; + struct scsi_link *sc_link; + + unit = UNIT(dev); + mode = MODE(dev); + st = st_data[unit]; + sc_link = st->sc_link; + + SC_DEBUG(sc_link, SDEV_DB1, ("closing\n")); + if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) + st_write_filemarks(unit, 1, 0); + switch (mode & 0x3) { + case 0: + case 3: /* for now */ + st_unmount(unit, NOEJECT); + break; + case 1: /*leave mounted unless media seems to have been removed */ + if (!(sc_link->flags & SDEV_MEDIA_LOADED)) { + st_unmount(unit, NOEJECT); + } + break; + case 2: + st_unmount(unit, EJECT); + break; + } + sc_link->flags &= ~SDEV_OPEN; + st->flags &= ~ST_OPEN; + return (0); +} + +/* + * Start a new mount session. + * Copy in all the default parameters from the selected device mode. + * and try guess any that seem to be defaulted. + */ +errval +st_mount_tape(dev, flags) + dev_t dev; + u_int32 flags; +{ + u_int32 unit, mode, dsty; + struct st_data *st; + struct scsi_link *sc_link; + errval errno = 0; + + unit = UNIT(dev); + mode = MODE(dev); + dsty = DSTY(dev); + st = st_data[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 (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)) { + 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)) { + printf("st%d: Cannot set selected mode", unit); + return errno; + } + scsi_prevent(sc_link, PR_PREVENT, 0); /* who cares if it fails? */ + 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(int unit, boolean eject) +{ + struct st_data *st = st_data[unit]; + struct scsi_link *sc_link = st->sc_link; + int32 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); + scsi_prevent(sc_link, PR_ALLOW, 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) + */ +errval +st_decide_mode(unit, first_read) + u_int32 unit; + boolean first_read; +{ + struct st_data *st = st_data[unit]; +#ifdef SCSIDEBUG + struct scsi_link *sc_link = st->sc_link; +#endif + + 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%d: bad quirks\n", unit); + return (EINVAL); + case ST_Q_FORCE_FIXED_MODE: /*specified fixed, but not what size */ + st->flags |= ST_FIXEDBLOCKS; + if (st->blkmin && (st->blkmin == st->blkmax)) + st->blksiz = st->blkmin; + else if (st->media_blksiz > 0) + st->blksiz = st->media_blksiz; + else + st->blksiz = DEF_FIXED_BSIZE; + SC_DEBUG(sc_link, SDEV_DB3, ("Quirks force fixed mode(%d)\n", + st->blksiz)); + goto done; + case ST_Q_FORCE_VAR_MODE: + st->flags &= ~ST_FIXEDBLOCKS; + st->blksiz = 0; + SC_DEBUG(sc_link, SDEV_DB3, ("Quirks force variable mode\n")); + goto done; + } + /* + * If the drive can only handle fixed-length blocks and only at + * one size, perhaps we should just do that. + */ + if (st->blkmin && (st->blkmin == st->blkmax)) { + st->flags |= ST_FIXEDBLOCKS; + st->blksiz = st->blkmin; + SC_DEBUG(sc_link, SDEV_DB3, + ("blkmin == blkmax of %d\n", st->blkmin)); + goto done; + } + /* + * If the tape density mandates (or even suggests) use of fixed + * or variable-length blocks, comply. + */ + switch ((int)st->density) { + case HALFINCH_800: + case HALFINCH_1600: + case HALFINCH_6250: + case DDS: + 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: + case QIC_525: + case QIC_1320: + 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 %d\n", st->media_blksiz)); + goto done; + } + /* + * We're getting no hints from any direction. Choose variable- + * length blocks arbitrarily. + */ + st->flags &= ~ST_FIXEDBLOCKS; + st->blksiz = 0; + SC_DEBUG(sc_link, SDEV_DB3, ("Give up and default to variable mode\n")); +done: + + /* + * Decide whether or not to write two file marks to signify end- + * of-data. Make the decision as a function of density. If + * the decision is not to use a second file mark, the SCSI BLANK + * CHECK condition code will be recognized as end-of-data when + * first read. + * (I think this should be a by-product of fixed/variable..julian) + */ + switch ((int)st->density) { +/* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ + case QIC_11: + case QIC_24: + case QIC_120: + case QIC_150: + case QIC_525: + case QIC_1320: + st->flags &= ~ST_2FM_AT_EOD; + break; + default: + st->flags |= ST_2FM_AT_EOD; + } + return 0; +} + +/* + * trim the size of the transfer if needed, + * called by physio + * basically the smaller of our min and the scsi driver's + * minphys + */ +void +stminphys(bp) + struct buf *bp; +{ + (*(st_data[UNIT(bp->b_dev)]->sc_link->adapter->scsi_minphys)) (bp); +} + +/* + * Actually translate the requested transfer into + * one the physical driver can understand + * The transfer is described by a buf and will include + * only one physical transfer. + */ +void +ststrategy(bp) + struct buf *bp; +{ + struct buf **dp; + unsigned char unit; + u_int32 opri; + struct st_data *st; + + ststrats++; + unit = UNIT((bp->b_dev)); + st = st_data[unit]; + SC_DEBUG(st->sc_link, SDEV_DB1, + (" strategy: %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->blksiz) { + printf("st%d: bad request, must be multiple of %d\n", + unit, st->blksiz); + bp->b_error = EIO; + goto bad; + } + } + /* + * as are out-of-range requests on variable drives. + */ + else if (bp->b_bcount < st->blkmin || bp->b_bcount > st->blkmax) { + printf("st%d: bad request, must be between %d and %d\n", + unit, st->blkmin, st->blkmax); + bp->b_error = EIO; + goto bad; + } + stminphys(bp); + opri = splbio(); + + /* + * Use a bounce buffer if necessary + */ +#ifndef NOBOUNCE + if (st->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() )) + */ + dp = &(st->buf_queue); + while (*dp) { + dp = &((*dp)->b_actf); + } + *dp = bp; + bp->b_actf = NULL; + + /* + * Tell the device to get going on the transfer if it's + * not doing anything, otherwise just wait for completion + * (All a bit silly if we're only allowing 1 open but..) + */ + ststart(unit); + + splx(opri); + return; +bad: + bp->b_flags |= B_ERROR; +done: + /* + * Correctly set the buf to indicate a completed xfer + */ + iodone(bp); + return; +} + +/* + * 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(unit) + u_int32 unit; +{ + struct st_data *st = st_data[unit]; + struct scsi_link *sc_link = st->sc_link; + register struct buf *bp = 0; + struct scsi_rw_tape cmd; + u_int32 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->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; + } + if ((bp = st->buf_queue) == NULL) { + return; /* no work to bother with */ + } + st->buf_queue = bp->b_actf; + + /* + * 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; + 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; + lto3b(bp->b_bcount / st->blksiz, cmd.len); + } else { + lto3b(bp->b_bcount, cmd.len); + } + /* + * go ask the adapter to do all this for us + */ + if (scsi_scsi_cmd(sc_link, + (struct scsi_generic *) &cmd, + sizeof(cmd), + (u_char *) bp->b_un.b_addr, + bp->b_bcount, + 0, /* can't retry a read on a tape really */ + 100000, + bp, + flags | SCSI_NOSLEEP) == SUCCESSFULLY_QUEUED) { + stqueues++; + } else { +badnews: + printf("st%d: oops not queued\n", unit); + bp->b_flags |= B_ERROR; + bp->b_error = EIO; + biodone(bp); + } + } /* go back and see if we can cram more work in.. */ +} + +/* + * Perform special action on behalf of the user; + * knows about the internals of this device + */ +errval +stioctl(dev, cmd, arg, flag) + dev_t dev; + int cmd; + caddr_t arg; + int flag; +{ + errval errcode = 0; + unsigned char unit; + u_int32 number, flags, dsty; + struct st_data *st; + u_int32 hold_blksiz; + u_int32 hold_density; + int32 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 = UNIT(dev); + dsty = DSTY(dev); + st = st_data[unit]; + hold_blksiz = st->blksiz; + 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_density = st->density; + g->mt_blksiz = st->blksiz; + 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; + 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 */ + errcode = st_write_filemarks(unit, number, flags); + break; + case MTBSF: /* backward space file */ + number = -number; + case MTFSF: /* forward space file */ + errcode = st_chkeod(unit, FALSE, &nmarks, flags); + if (errcode == ESUCCESS) + errcode = st_space(unit, number - nmarks, + SP_FILEMARKS, flags); + break; + case MTBSR: /* backward space record */ + number = -number; + case MTFSR: /* forward space record */ + errcode = st_chkeod(unit, TRUE, &nmarks, flags); + if (errcode == ESUCCESS) + errcode = st_space(unit, number, SP_BLKS, flags); + break; + case MTREW: /* rewind */ + errcode = st_rewind(unit, FALSE, flags); + break; + case MTOFFL: /* rewind and put the drive offline */ + 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 > SCSI_2_MAX_DENSITY_CODE) { + errcode = EINVAL; + } else { + st->density = number; + } + goto try_new_value; + + default: + errcode = EINVAL; + } + break; + } + case MTIOCIEOT: + case MTIOCEEOT: + break; + default: + if(MODE(dev) == CTLMODE) + errcode = scsi_do_ioctl(st->sc_link,cmd,arg,flag); + 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)) { /* put it back as it was */ + printf("st%d: Cannot set selected mode", unit); + st->density = hold_density; + st->blksiz = hold_blksiz; + if (st->blksiz) { + st->flags |= ST_FIXEDBLOCKS; + } else { + st->flags &= ~ST_FIXEDBLOCKS; + } + return (errcode); + } + /* + * As the drive liked it, if we are setting a new default, + * set it into the structures as such. + * + * The means for deciding this are not finalised yet + */ + if (MODE(dev) == 0x03) { + /* 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. + */ +errval +st_read(unit, buf, size, flags) + u_int32 unit, size, flags; + char *buf; +{ + struct scsi_rw_tape scsi_cmd; + struct st_data *st = st_data[unit]; + + /* + * If it's a null transfer, return immediatly + */ + if (size == 0) { + return (ESUCCESS); + } + bzero(&scsi_cmd, sizeof(scsi_cmd)); + scsi_cmd.op_code = READ_COMMAND_TAPE; + if (st->flags & ST_FIXEDBLOCKS) { + scsi_cmd.byte2 |= SRWT_FIXED; + lto3b(size / (st->blksiz ? st->blksiz : DEF_FIXED_BSIZE), + scsi_cmd.len); + } else { + lto3b(size, scsi_cmd.len); + } + return (scsi_scsi_cmd(st->sc_link, + (struct scsi_generic *) &scsi_cmd, + sizeof(scsi_cmd), + (u_char *) buf, + size, + 0, /* not on io commands */ + 100000, + NULL, + flags | SCSI_DATA_IN)); +} +#ifdef __STDC__ +#define b2tol(a) (((unsigned)(a##_1) << 8) + (unsigned)a##_0 ) +#else +#define b2tol(a) (((unsigned)(a/**/_1) << 8) + (unsigned)a/**/_0 ) +#endif + +/* + * Ask the drive what it's min and max blk sizes are. + */ +errval +st_rd_blk_lim(unit, flags) + u_int32 unit, flags; +{ + struct scsi_blk_limits scsi_cmd; + struct scsi_blk_limits_data scsi_blkl; + struct st_data *st = st_data[unit]; + errval errno; + struct scsi_link *sc_link = st->sc_link; + + /* + * 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 = _3btol(&scsi_blkl.max_length_2); + + SC_DEBUG(sc_link, SDEV_DB3, + ("(%d <= blksiz <= %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) + */ +errval +st_mode_sense(unit, flags) + u_int32 unit, flags; +{ + u_int32 scsi_sense_len; + errval errno; + char *scsi_sense_ptr; + struct scsi_mode_sense scsi_cmd; + struct scsi_sense { + struct scsi_mode_header header; + struct blk_desc blk_desc; + } scsi_sense; + + struct scsi_sense_page_0 { + struct scsi_mode_header header; + struct blk_desc blk_desc; + unsigned char sense_data[PAGE_0_SENSE_DATA_SIZE]; + /* Tandberg tape drives returns page 00 + * with the sense data, whether or not + * you want it( ie the don't like you + * saying you want anything less!!!!! + * They also expect page 00 + * back when you issue a mode select + */ + } scsi_sense_page_0; + struct st_data *st = st_data[unit]; + struct scsi_link *sc_link = st->sc_link; + + /* + * Define what sort of structure we're working with + */ + if (st->quirks & ST_Q_NEEDS_PAGE_0) { + scsi_sense_len = sizeof(scsi_sense_page_0); + scsi_sense_ptr = (char *) &scsi_sense_page_0; + } else { + scsi_sense_len = sizeof(scsi_sense); + scsi_sense_ptr = (char *) &scsi_sense; + } + /* + * Set up a mode sense + */ + bzero(&scsi_cmd, sizeof(scsi_cmd)); + scsi_cmd.op_code = MODE_SENSE; + scsi_cmd.length = scsi_sense_len; + + /* + * do the command, but we don't need the results + * just print them for our interest's sake, if asked, + * or if we need it as a template for the mode select + * store it away. + */ + if (errno = scsi_scsi_cmd(sc_link, + (struct scsi_generic *) &scsi_cmd, + sizeof(scsi_cmd), + (u_char *) scsi_sense_ptr, + scsi_sense_len, + ST_RETRIES, + 5000, + NULL, + flags | SCSI_DATA_IN)) { + return errno; + } + st->numblks = _3btol(((struct scsi_sense *)scsi_sense_ptr)->blk_desc.nblocks); + st->media_blksiz = _3btol(((struct scsi_sense *)scsi_sense_ptr)->blk_desc.blklen); + st->media_density = ((struct scsi_sense *) scsi_sense_ptr)->blk_desc.density; + if (((struct scsi_sense *) scsi_sense_ptr)->header.dev_spec & + SMH_DSP_WRITE_PROT) { + st->flags |= ST_READONLY; + } + SC_DEBUG(sc_link, SDEV_DB3, + ("density code 0x%x, %d-byte blocks, write-%s, ", + st->media_density, st->media_blksiz, + st->flags & ST_READONLY ? "protected" : "enabled")); + SC_DEBUG(sc_link, SDEV_DB3, + ("%sbuffered\n", + ((struct scsi_sense *) scsi_sense_ptr)->header.dev_spec + & SMH_DSP_BUFF_MODE ? "" : "un")); + if (st->quirks & ST_Q_NEEDS_PAGE_0) { + bcopy(((struct scsi_sense_page_0 *) scsi_sense_ptr)->sense_data, + st->sense_data, + sizeof(((struct scsi_sense_page_0 *) scsi_sense_ptr)->sense_data)); + } + 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. + */ +errval +st_mode_select(unit, flags) + u_int32 unit, flags; +{ + u_int32 dat_len; + char *dat_ptr; + struct scsi_mode_select scsi_cmd; + struct dat { + struct scsi_mode_header header; + struct blk_desc blk_desc; + } dat; + struct dat_page_0 { + struct scsi_mode_header header; + struct blk_desc blk_desc; + unsigned char sense_data[PAGE_0_SENSE_DATA_SIZE]; + } dat_page_0; + struct st_data *st = st_data[unit]; + + /* + * Define what sort of structure we're working with + */ + if (st->quirks & ST_Q_NEEDS_PAGE_0) { + dat_len = sizeof(dat_page_0); + dat_ptr = (char *) &dat_page_0; + } else { + dat_len = sizeof(dat); + dat_ptr = (char *) &dat; + } + /* + * Set up for a mode select + */ + bzero(dat_ptr, dat_len); + bzero(&scsi_cmd, sizeof(scsi_cmd)); + scsi_cmd.op_code = MODE_SELECT; + scsi_cmd.length = dat_len; + ((struct dat *) dat_ptr)->header.blk_desc_len = sizeof(struct blk_desc); + ((struct dat *) dat_ptr)->header.dev_spec |= SMH_DSP_BUFF_MODE_ON; + ((struct dat *) dat_ptr)->blk_desc.density = st->density; + if (st->flags & ST_FIXEDBLOCKS) { + lto3b(st->blksiz, ((struct dat *) dat_ptr)->blk_desc.blklen); + } + if (st->quirks & ST_Q_NEEDS_PAGE_0) { + bcopy(st->sense_data, ((struct dat_page_0 *) dat_ptr)->sense_data, + sizeof(((struct dat_page_0 *) dat_ptr)->sense_data)); + /* the Tandberg tapes need the block size to */ + /* be set on each mode sense/select. */ + } + /* + * do the command + */ + return (scsi_scsi_cmd(st->sc_link, + (struct scsi_generic *) &scsi_cmd, + sizeof(scsi_cmd), + (u_char *) dat_ptr, + dat_len, + ST_RETRIES, + 5000, + NULL, + flags | SCSI_DATA_OUT)); +} + +/* + * skip N blocks/filemarks/seq filemarks/eom + */ +errval +st_space(unit, number, what, flags) + u_int32 unit, what, flags; + int32 number; +{ + errval error; + struct scsi_space scsi_cmd; + struct st_data *st = st_data[unit]; + + 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 */ + } + } + if (number == 0) { + return (ESUCCESS); + } + bzero(&scsi_cmd, sizeof(scsi_cmd)); + scsi_cmd.op_code = SPACE; + scsi_cmd.byte2 = what & SS_CODE; + lto3b(number, scsi_cmd.number); + return (scsi_scsi_cmd(st->sc_link, + (struct scsi_generic *) &scsi_cmd, + sizeof(scsi_cmd), + 0, + 0, + 0, /* no retries please , just fail */ + 600000, /* 10 mins enough? */ + NULL, + flags)); +} + +/* + * write N filemarks + */ +errval +st_write_filemarks(unit, number, flags) + u_int32 unit, flags; + int32 number; +{ + struct scsi_write_filemarks scsi_cmd; + struct st_data *st = st_data[unit]; + + /* + * It's hard to write a negative number of file marks. + * Don't try. + */ + if (number < 0) { + return EINVAL; + } + 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; + lto3b(number, scsi_cmd.number); + return scsi_scsi_cmd(st->sc_link, + (struct scsi_generic *) &scsi_cmd, + sizeof(scsi_cmd), + 0, + 0, + 0, /* no retries, just fail */ + 100000, /* 10 secs.. (may need to repos head ) */ + NULL, + flags); +} + +/* + * Make sure the right number of file marks is on tape if the + * tape has been written. If the position argument is true, + * leave the tape positioned where it was originally. + * + * nmarks returns the number of marks to skip (or, if position + * true, which were skipped) to get back original position. + */ +int32 +st_chkeod(unit, position, nmarks, flags) + u_int32 unit; + boolean position; + int32 *nmarks; + u_int32 flags; +{ + errval error; + struct st_data *st = st_data[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) + */ +errval +st_load(unit, type, flags) + u_int32 unit, type, flags; +{ + struct scsi_load scsi_cmd; + struct st_data *st = st_data[unit]; + struct scsi_link *sc_link = st->sc_link; + + bzero(&scsi_cmd, sizeof(scsi_cmd)); + if (type != LD_LOAD) { + errval error; + int32 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(st->sc_link, + (struct scsi_generic *) &scsi_cmd, + sizeof(scsi_cmd), + 0, + 0, + ST_RETRIES, + 300000, /* 5 min */ + NULL, + flags)); +} + +/* + * Rewind the device + */ +errval +st_rewind(unit, immed, flags) + u_int32 unit, flags; + boolean immed; +{ + struct scsi_rewind scsi_cmd; + struct st_data *st = st_data[unit]; + errval error; + int32 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(st->sc_link, + (struct scsi_generic *) &scsi_cmd, + sizeof(scsi_cmd), + 0, + 0, + ST_RETRIES, + immed ? 5000 : 300000, /* 5 sec or 5 min */ + NULL, + flags)); +} + +#ifdef NETBSD +#define SIGNAL_SHORT_READ +#else +#define SIGNAL_SHORT_READ bp->b_flags |= B_ERROR; +#endif + +/* + * 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) + */ +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; + struct buf *bp = xs->bp; + u_int32 unit = sc_link->dev_unit; + struct st_data *st = st_data[unit]; + u_int32 key; + int32 info; + + /* + * Get the sense fields and work out what code + */ + if (sense->error_code & SSD_ERRCODE_VALID) { + info = ntohl(*((int32 *) sense->ext.extended.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->blksiz; + if (sense->ext.extended.flags & SSD_EOM) { + st->flags |= ST_EIO_PENDING; + if (bp) { + bp->b_resid = xs->resid; + SIGNAL_SHORT_READ + } + } + if (sense->ext.extended.flags & SSD_FILEMARK) { + st->flags |= ST_AT_FILEMARK; + if (bp) { + bp->b_resid = xs->resid; + SIGNAL_SHORT_READ + } + } + if (sense->ext.extended.flags & SSD_ILI) { + st->flags |= ST_EIO_PENDING; + if (bp) { + bp->b_resid = xs->resid; + SIGNAL_SHORT_READ + } + if (sense->error_code & SSD_ERRCODE_VALID && + !silent) + printf("st%d: block wrong size" + ", %d blocks residual\n", unit + ,info); + + /* + * This quirk code helps the drive read + * the first tape block, regardless of + * format. That is required for these + * drives to return proper MODE SENSE + * information. + */ + if ((st->quirks & ST_Q_SNS_HLP) && + !(sc_link->flags & SDEV_MEDIA_LOADED)) { + st->blksiz -= 512; + } + } + /* + * If no data was tranfered, do it immediatly + */ + if (xs->resid >= xs->datalen) { + if (st->flags & ST_EIO_PENDING) { + return EIO; + } + if (st->flags & ST_AT_FILEMARK) { + if (bp) { + bp->b_resid = xs->resid; + SIGNAL_SHORT_READ + } + 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) { + if (bp) + bp->b_resid = bp->b_bcount; + return 0; + } + if (sense->ext.extended.flags & SSD_ILI) { + if (info < 0) { + /* + * the record was bigger than the read + */ + if (!silent) + printf("st%d: %d-byte record " + "too big\n", unit, + xs->datalen - info); + return (EIO); + } + xs->resid = info; + if (bp) { + bp->b_resid = info; + SIGNAL_SHORT_READ + } + } + } + key = sense->ext.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_SNS_HLP) && + !(sc_link->flags & SDEV_MEDIA_LOADED)) { /* still starting */ + st->blksiz -= 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 (ESUCCESS); + } + } + 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. + */ +errval +st_touch_tape(unit) + u_int32 unit; +{ + struct st_data *st = st_data[unit]; + char *buf; + u_int32 readsiz; + errval errno; + + buf = malloc(1024, M_TEMP, M_NOWAIT); + if (!buf) + return (ENOMEM); + + if (errno = st_mode_sense(unit, 0)) { + goto bad; + } + st->blksiz = 1024; + do { + switch ((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)) { + goto bad; + } + st_read(unit, buf, readsiz, SCSI_SILENT); + if (errno = st_rewind(unit, FALSE, 0)) { +bad: free(buf, M_TEMP); + return (errno); + } + } while (readsiz != 1 && readsiz > st->blksiz); + free(buf, M_TEMP); + return 0; +} |
