1 /* $NetBSD: st.c,v 1.77 1997/10/01 18:45:02 mjacob Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Charles Hannum. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Charles Hannum. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Originally written by Julian Elischer (julian@tfs.com) 34 * for TRW Financial Systems for use under the MACH(2.5) operating system. 35 * 36 * TRW Financial Systems, in accordance with their agreement with Carnegie 37 * Mellon University, makes this software available to CMU to distribute 38 * or use in any manner that they see fit as long as this message is kept with 39 * the software. For this reason TFS also grants any other persons or 40 * organisations permission to use or modify this software. 41 * 42 * TFS supplies this software to be publicly redistributed 43 * on the understanding that TFS is not responsible for the correct 44 * functioning of this software in any circumstances. 45 * 46 * Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992 47 * major changes by Julian Elischer (julian@jules.dialix.oz.au) May 1993 48 */ 49 50 /* 51 * To do: 52 * work out some better way of guessing what a good timeout is going 53 * to be depending on whether we expect to retension or not. 54 */ 55 56 #include "opt_scsiverbose.h" 57 58 #include <sys/types.h> 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/fcntl.h> 62 #include <sys/errno.h> 63 #include <sys/ioctl.h> 64 #include <sys/malloc.h> 65 #include <sys/buf.h> 66 #include <sys/proc.h> 67 #include <sys/user.h> 68 #include <sys/mtio.h> 69 #include <sys/device.h> 70 #include <sys/conf.h> 71 72 #include <dev/scsipi/scsi_all.h> 73 #include <dev/scsipi/scsipi_all.h> 74 #include <dev/scsipi/scsi_all.h> 75 #include <dev/scsipi/scsi_tape.h> 76 #include <dev/scsipi/scsiconf.h> 77 78 /* Defines for device specific stuff */ 79 #define DEF_FIXED_BSIZE 512 80 #define ST_RETRIES 4 /* only on non IO commands */ 81 82 #define STMODE(z) ( minor(z) & 0x03) 83 #define STDSTY(z) ((minor(z) >> 2) & 0x03) 84 #define STUNIT(z) ((minor(z) >> 4) ) 85 #define CTLMODE 3 86 87 /* 88 * Maximum density code known. 89 */ 90 #define SCSI_2_MAX_DENSITY_CODE 0x45 91 92 /* 93 * Define various devices that we know mis-behave in some way, 94 * and note how they are bad, so we can correct for them 95 */ 96 struct modes { 97 u_int quirks; /* same definitions as in quirkdata */ 98 int blksize; 99 u_int8_t density; 100 }; 101 102 struct quirkdata { 103 u_int quirks; 104 #define ST_Q_FORCE_BLKSIZE 0x0001 105 #define ST_Q_SENSE_HELP 0x0002 /* must do READ for good MODE SENSE */ 106 #define ST_Q_IGNORE_LOADS 0x0004 107 #define ST_Q_BLKSIZE 0x0008 /* variable-block media_blksize > 0 */ 108 #define ST_Q_UNIMODAL 0x0010 /* unimode drive rejects mode select */ 109 u_int page_0_size; 110 #define MAX_PAGE_0_SIZE 64 111 struct modes modes[4]; 112 }; 113 114 struct st_quirk_inquiry_pattern { 115 struct scsipi_inquiry_pattern pattern; 116 struct quirkdata quirkdata; 117 }; 118 119 struct st_quirk_inquiry_pattern st_quirk_patterns[] = { 120 {{T_SEQUENTIAL, T_REMOV, 121 " ", " ", " "}, {0, 0, { 122 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 123 {ST_Q_FORCE_BLKSIZE, 512, QIC_24}, /* minor 4-7 */ 124 {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_1600}, /* minor 8-11 */ 125 {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_6250} /* minor 12-15 */ 126 }}}, 127 {{T_SEQUENTIAL, T_REMOV, 128 "TANDBERG", " TDC 3600 ", ""}, {0, 12, { 129 {0, 0, 0}, /* minor 0-3 */ 130 {ST_Q_FORCE_BLKSIZE, 0, QIC_525}, /* minor 4-7 */ 131 {0, 0, QIC_150}, /* minor 8-11 */ 132 {0, 0, QIC_120} /* minor 12-15 */ 133 }}}, 134 {{T_SEQUENTIAL, T_REMOV, 135 "TANDBERG", " TDC 3800 ", ""}, {0, 0, { 136 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 137 {0, 0, QIC_525}, /* minor 4-7 */ 138 {0, 0, QIC_150}, /* minor 8-11 */ 139 {0, 0, QIC_120} /* minor 12-15 */ 140 }}}, 141 /* 142 * At least -005 and -007 need this. I'll assume they all do unless I 143 * hear otherwise. - mycroft, 31MAR1994 144 */ 145 {{T_SEQUENTIAL, T_REMOV, 146 "ARCHIVE ", "VIPER 2525 25462", ""}, {0, 0, { 147 {ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */ 148 {ST_Q_SENSE_HELP, 0, QIC_525}, /* minor 4-7 */ 149 {0, 0, QIC_150}, /* minor 8-11 */ 150 {0, 0, QIC_120} /* minor 12-15 */ 151 }}}, 152 /* 153 * One user reports that this works for his tape drive. It probably 154 * needs more work. - mycroft, 09APR1994 155 */ 156 {{T_SEQUENTIAL, T_REMOV, 157 "SANKYO ", "CP525 ", ""}, {0, 0, { 158 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 159 {ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */ 160 {0, 0, QIC_150}, /* minor 8-11 */ 161 {0, 0, QIC_120} /* minor 12-15 */ 162 }}}, 163 {{T_SEQUENTIAL, T_REMOV, 164 "ANRITSU ", "DMT780 ", ""}, {0, 0, { 165 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 166 {ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */ 167 {0, 0, QIC_150}, /* minor 8-11 */ 168 {0, 0, QIC_120} /* minor 12-15 */ 169 }}}, 170 {{T_SEQUENTIAL, T_REMOV, 171 "ARCHIVE ", "VIPER 150 21247", ""}, {0, 12, { 172 {0, 0, 0}, /* minor 0-3 */ 173 {0, 0, QIC_150}, /* minor 4-7 */ 174 {0, 0, QIC_120}, /* minor 8-11 */ 175 {0, 0, QIC_24} /* minor 12-15 */ 176 }}}, 177 {{T_SEQUENTIAL, T_REMOV, 178 "WANGTEK ", "5099ES SCSI", ""}, {0, 0, { 179 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 180 {0, 0, QIC_11}, /* minor 4-7 */ 181 {0, 0, QIC_24}, /* minor 8-11 */ 182 {0, 0, QIC_24} /* minor 12-15 */ 183 }}}, 184 {{T_SEQUENTIAL, T_REMOV, 185 "WANGTEK ", "5150ES SCSI", ""}, {0, 0, { 186 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 187 {0, 0, QIC_24}, /* minor 4-7 */ 188 {0, 0, QIC_120}, /* minor 8-11 */ 189 {0, 0, QIC_150} /* minor 12-15 */ 190 }}}, 191 {{T_SEQUENTIAL, T_REMOV, 192 "WANGTEK ", "5525ES SCSI REV7", ""}, {0, 0, { 193 {0, 0, 0}, /* minor 0-3 */ 194 {ST_Q_BLKSIZE, 0, QIC_525}, /* minor 4-7 */ 195 {0, 0, QIC_150}, /* minor 8-11 */ 196 {0, 0, QIC_120} /* minor 12-15 */ 197 }}}, 198 {{T_SEQUENTIAL, T_REMOV, 199 "WangDAT ", "Model 1300 ", ""}, {0, 0, { 200 {0, 0, 0}, /* minor 0-3 */ 201 {ST_Q_FORCE_BLKSIZE, 512, DDS}, /* minor 4-7 */ 202 {ST_Q_FORCE_BLKSIZE, 1024, DDS}, /* minor 8-11 */ 203 {ST_Q_FORCE_BLKSIZE, 0, DDS} /* minor 12-15 */ 204 }}}, 205 {{T_SEQUENTIAL, T_REMOV, 206 "EXABYTE ", "EXB-8200 ", "263H"}, {0, 5, { 207 {0, 0, 0}, /* minor 0-3 */ 208 {0, 0, 0}, /* minor 4-7 */ 209 {0, 0, 0}, /* minor 8-11 */ 210 {0, 0, 0} /* minor 12-15 */ 211 }}}, 212 {{T_SEQUENTIAL, T_REMOV, 213 "HP ", "T4000s ", ""}, {ST_Q_UNIMODAL, 0, { 214 {0, 0, QIC_3095}, /* minor 0-3 */ 215 {0, 0, QIC_3095}, /* minor 4-7 */ 216 {0, 0, QIC_3095}, /* minor 8-11 */ 217 {0, 0, QIC_3095}, /* minor 12-15 */ 218 }}}, 219 #if 0 220 {{T_SEQUENTIAL, T_REMOV, 221 "EXABYTE ", "EXB-8200 ", ""}, {0, 12, { 222 {0, 0, 0}, /* minor 0-3 */ 223 {0, 0, 0}, /* minor 4-7 */ 224 {0, 0, 0}, /* minor 8-11 */ 225 {0, 0, 0} /* minor 12-15 */ 226 }}}, 227 #endif 228 }; 229 230 #define NOEJECT 0 231 #define EJECT 1 232 233 struct st_softc { 234 struct device sc_dev; 235 /*--------------------present operating parameters, flags etc.---------------*/ 236 int flags; /* see below */ 237 u_int quirks; /* quirks for the open mode */ 238 int blksize; /* blksize we are using */ 239 u_int8_t density; /* present density */ 240 u_int page_0_size; /* size of page 0 data */ 241 u_int last_dsty; /* last density opened */ 242 /*--------------------device/scsi parameters---------------------------------*/ 243 struct scsipi_link *sc_link; /* our link to the adpter etc. */ 244 /*--------------------parameters reported by the device ---------------------*/ 245 int blkmin; /* min blk size */ 246 int blkmax; /* max blk size */ 247 struct quirkdata *quirkdata; /* if we have a rogue entry */ 248 /*--------------------parameters reported by the device for this media-------*/ 249 u_long numblks; /* nominal blocks capacity */ 250 int media_blksize; /* 0 if not ST_FIXEDBLOCKS */ 251 u_int8_t media_density; /* this is what it said when asked */ 252 /*--------------------quirks for the whole drive-----------------------------*/ 253 u_int drive_quirks; /* quirks of this drive */ 254 /*--------------------How we should set up when opening each minor device----*/ 255 struct modes modes[4]; /* plus more for each mode */ 256 u_int8_t modeflags[4]; /* flags for the modes */ 257 #define DENSITY_SET_BY_USER 0x01 258 #define DENSITY_SET_BY_QUIRK 0x02 259 #define BLKSIZE_SET_BY_USER 0x04 260 #define BLKSIZE_SET_BY_QUIRK 0x08 261 /*--------------------storage for sense data returned by the drive-----------*/ 262 u_char sense_data[MAX_PAGE_0_SIZE]; /* 263 * additional sense data needed 264 * for mode sense/select. 265 */ 266 struct buf buf_queue; /* the queue of pending IO */ 267 /* operations */ 268 }; 269 270 271 #ifdef __BROKEN_INDIRECT_CONFIG 272 int stmatch __P((struct device *, void *, void *)); 273 #else 274 int stmatch __P((struct device *, struct cfdata *, void *)); 275 #endif 276 void stattach __P((struct device *, struct device *, void *)); 277 void st_identify_drive __P((struct st_softc *, 278 struct scsipi_inquiry_pattern *)); 279 void st_loadquirks __P((struct st_softc *)); 280 int st_mount_tape __P((dev_t, int)); 281 void st_unmount __P((struct st_softc *, boolean)); 282 int st_decide_mode __P((struct st_softc *, boolean)); 283 void ststart __P((void *)); 284 int st_read __P((struct st_softc *, char *, int, int)); 285 int st_read_block_limits __P((struct st_softc *, int)); 286 int st_mode_sense __P((struct st_softc *, int)); 287 int st_mode_select __P((struct st_softc *, int)); 288 int st_cmprss __P((struct st_softc *, int)); 289 int st_space __P((struct st_softc *, int, u_int, int)); 290 int st_write_filemarks __P((struct st_softc *, int, int)); 291 int st_check_eod __P((struct st_softc *, boolean, int *, int)); 292 int st_load __P((struct st_softc *, u_int, int)); 293 int st_rewind __P((struct st_softc *, u_int, int)); 294 int st_interpret_sense __P((struct scsipi_xfer *)); 295 int st_touch_tape __P((struct st_softc *)); 296 int st_erase __P((struct st_softc *, int full, int flags)); 297 int st_rdpos __P((struct st_softc *, int, u_int32_t *)); 298 int st_setpos __P((struct st_softc *, int, u_int32_t *)); 299 300 struct cfattach st_ca = { 301 sizeof(struct st_softc), stmatch, stattach 302 }; 303 304 struct cfdriver st_cd = { 305 NULL, "st", DV_TAPE 306 }; 307 308 struct scsipi_device st_switch = { 309 st_interpret_sense, 310 ststart, 311 NULL, 312 NULL, 313 }; 314 315 #define ST_INFO_VALID 0x0001 316 #define ST_BLOCK_SET 0x0002 /* block size, mode set by ioctl */ 317 #define ST_WRITTEN 0x0004 /* data have been written, EOD needed */ 318 #define ST_FIXEDBLOCKS 0x0008 319 #define ST_AT_FILEMARK 0x0010 320 #define ST_EIO_PENDING 0x0020 /* we couldn't report it then (had data) */ 321 #define ST_NEW_MOUNT 0x0040 /* still need to decide mode */ 322 #define ST_READONLY 0x0080 /* st_mode_sense says write protected */ 323 #define ST_FM_WRITTEN 0x0100 /* 324 * EOF file mark written -- used with 325 * ~ST_WRITTEN to indicate that multiple file 326 * marks have been written 327 */ 328 #define ST_BLANK_READ 0x0200 /* BLANK CHECK encountered already */ 329 #define ST_2FM_AT_EOD 0x0400 /* write 2 file marks at EOD */ 330 #define ST_MOUNTED 0x0800 /* Device is presently mounted */ 331 #define ST_DONTBUFFER 0x1000 /* Disable buffering/caching */ 332 333 #define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ) 334 #define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \ 335 ST_FIXEDBLOCKS | ST_READONLY | ST_FM_WRITTEN | \ 336 ST_2FM_AT_EOD | ST_PER_ACTION) 337 338 struct scsipi_inquiry_pattern st_patterns[] = { 339 {T_SEQUENTIAL, T_REMOV, 340 "", "", ""}, 341 }; 342 343 int 344 stmatch(parent, match, aux) 345 struct device *parent; 346 #ifdef __BROKEN_INDIRECT_CONFIG 347 void *match; 348 #else 349 struct cfdata *match; 350 #endif 351 void *aux; 352 { 353 struct scsipibus_attach_args *sa = aux; 354 int priority; 355 356 (void)scsipi_inqmatch(&sa->sa_inqbuf, 357 (caddr_t)st_patterns, sizeof(st_patterns)/sizeof(st_patterns[0]), 358 sizeof(st_patterns[0]), &priority); 359 return (priority); 360 } 361 362 /* 363 * The routine called by the low level scsi routine when it discovers 364 * A device suitable for this driver 365 */ 366 void 367 stattach(parent, self, aux) 368 struct device *parent, *self; 369 void *aux; 370 { 371 struct st_softc *st = (void *)self; 372 struct scsipibus_attach_args *sa = aux; 373 struct scsipi_link *sc_link = sa->sa_sc_link; 374 375 SC_DEBUG(sc_link, SDEV_DB2, ("stattach: ")); 376 377 /* 378 * Store information needed to contact our base driver 379 */ 380 st->sc_link = sc_link; 381 sc_link->device = &st_switch; 382 sc_link->device_softc = st; 383 sc_link->openings = 1; 384 385 /* 386 * Check if the drive is a known criminal and take 387 * Any steps needed to bring it into line 388 */ 389 st_identify_drive(st, &sa->sa_inqbuf); 390 391 /* 392 * Use the subdriver to request information regarding 393 * the drive. We cannot use interrupts yet, so the 394 * request must specify this. 395 */ 396 printf("\n"); 397 printf("%s: %s", st->sc_dev.dv_xname, st->quirkdata ? "rogue, " : ""); 398 if (scsipi_test_unit_ready(sc_link, 399 SCSI_AUTOCONF | SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE) || 400 st_mode_sense(st, 401 SCSI_AUTOCONF | SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE)) 402 printf("drive empty\n"); 403 else { 404 printf("density code 0x%x, ", st->media_density); 405 if (st->media_blksize > 0) 406 printf("%d-byte", st->media_blksize); 407 else 408 printf("variable"); 409 printf(" blocks, write-%s\n", 410 (st->flags & ST_READONLY) ? "protected" : "enabled"); 411 } 412 413 /* 414 * Set up the buf queue for this device 415 */ 416 st->buf_queue.b_active = 0; 417 st->buf_queue.b_actf = 0; 418 st->buf_queue.b_actb = &st->buf_queue.b_actf; 419 } 420 421 /* 422 * Use the inquiry routine in 'scsi_base' to get drive info so we can 423 * Further tailor our behaviour. 424 */ 425 void 426 st_identify_drive(st, inqbuf) 427 struct st_softc *st; 428 struct scsipi_inquiry_pattern *inqbuf; 429 { 430 struct st_quirk_inquiry_pattern *finger; 431 int priority; 432 433 finger = (struct st_quirk_inquiry_pattern *)scsipi_inqmatch(inqbuf, 434 (caddr_t)st_quirk_patterns, 435 sizeof(st_quirk_patterns) / sizeof(st_quirk_patterns[0]), 436 sizeof(st_quirk_patterns[0]), &priority); 437 if (priority != 0) { 438 st->quirkdata = &finger->quirkdata; 439 st->drive_quirks = finger->quirkdata.quirks; 440 st->quirks = finger->quirkdata.quirks; /* start value */ 441 st->page_0_size = finger->quirkdata.page_0_size; 442 st_loadquirks(st); 443 } 444 } 445 446 /* 447 * initialise the subdevices to the default (QUIRK) state. 448 * this will remove any setting made by the system operator or previous 449 * operations. 450 */ 451 void 452 st_loadquirks(st) 453 struct st_softc *st; 454 { 455 int i; 456 struct modes *mode; 457 struct modes *mode2; 458 459 mode = st->quirkdata->modes; 460 mode2 = st->modes; 461 for (i = 0; i < 4; i++) { 462 bzero(mode2, sizeof(struct modes)); 463 st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK | 464 DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER | 465 DENSITY_SET_BY_USER); 466 if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_BLKSIZE) { 467 mode2->blksize = mode->blksize; 468 st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK; 469 } 470 if (mode->density) { 471 mode2->density = mode->density; 472 st->modeflags[i] |= DENSITY_SET_BY_QUIRK; 473 } 474 mode++; 475 mode2++; 476 } 477 } 478 479 /* 480 * open the device. 481 */ 482 int 483 stopen(dev, flags, mode, p) 484 dev_t dev; 485 int flags; 486 int mode; 487 struct proc *p; 488 { 489 int unit; 490 u_int stmode, dsty; 491 int error = 0; 492 struct st_softc *st; 493 struct scsipi_link *sc_link; 494 495 unit = STUNIT(dev); 496 if (unit >= st_cd.cd_ndevs) 497 return (ENXIO); 498 st = st_cd.cd_devs[unit]; 499 if (st == NULL) 500 return (ENXIO); 501 502 stmode = STMODE(dev); 503 dsty = STDSTY(dev); 504 sc_link = st->sc_link; 505 506 SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev, 507 unit, st_cd.cd_ndevs)); 508 509 /* 510 * Only allow one at a time 511 */ 512 if (sc_link->flags & SDEV_OPEN) { 513 printf("%s: already open\n", st->sc_dev.dv_xname); 514 return (EBUSY); 515 } 516 517 /* 518 * Catch any unit attention errors. 519 */ 520 error = scsipi_test_unit_ready(sc_link, SCSI_IGNORE_MEDIA_CHANGE | 521 (stmode == CTLMODE ? SCSI_IGNORE_NOT_READY : 0)); 522 if (error) 523 goto bad; 524 525 sc_link->flags |= SDEV_OPEN; /* unit attn are now errors */ 526 527 /* 528 * If the mode is 3 (e.g. minor = 3,7,11,15) 529 * then the device has been opened to set defaults 530 * This mode does NOT ALLOW I/O, only ioctls 531 */ 532 if (stmode == CTLMODE) 533 return (0); 534 535 /* 536 * if it's a different mode, or if the media has been 537 * invalidated, unmount the tape from the previous 538 * session but continue with open processing 539 */ 540 if (st->last_dsty != dsty || !(sc_link->flags & SDEV_MEDIA_LOADED)) 541 st_unmount(st, NOEJECT); 542 543 /* 544 * If we are not mounted, then we should start a new 545 * mount session. 546 */ 547 if (!(st->flags & ST_MOUNTED)) { 548 st_mount_tape(dev, flags); 549 st->last_dsty = dsty; 550 } 551 552 /* 553 * Make sure that a tape opened in write-only mode will have 554 * file marks written on it when closed, even if not written to. 555 * This is for SUN compatibility 556 */ 557 if ((flags & O_ACCMODE) == FWRITE) 558 st->flags |= ST_WRITTEN; 559 560 SC_DEBUG(sc_link, SDEV_DB2, ("open complete\n")); 561 return (0); 562 563 bad: 564 st_unmount(st, NOEJECT); 565 sc_link->flags &= ~SDEV_OPEN; 566 return (error); 567 } 568 569 /* 570 * close the device.. only called if we are the LAST 571 * occurence of an open device 572 */ 573 int 574 stclose(dev, flags, mode, p) 575 dev_t dev; 576 int flags; 577 int mode; 578 struct proc *p; 579 { 580 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)]; 581 582 SC_DEBUG(st->sc_link, SDEV_DB1, ("closing\n")); 583 if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) 584 st_write_filemarks(st, 1, 0); 585 switch (STMODE(dev)) { 586 case 0: 587 case 3: /* for now */ 588 st_unmount(st, NOEJECT); 589 break; 590 case 1: 591 /* leave mounted unless media seems to have been removed */ 592 if (!(st->sc_link->flags & SDEV_MEDIA_LOADED)) 593 st_unmount(st, NOEJECT); 594 break; 595 case 2: 596 st_unmount(st, EJECT); 597 break; 598 } 599 st->sc_link->flags &= ~SDEV_OPEN; 600 601 return (0); 602 } 603 604 /* 605 * Start a new mount session. 606 * Copy in all the default parameters from the selected device mode. 607 * and try guess any that seem to be defaulted. 608 */ 609 int 610 st_mount_tape(dev, flags) 611 dev_t dev; 612 int flags; 613 { 614 int unit; 615 u_int mode, dsty; 616 struct st_softc *st; 617 struct scsipi_link *sc_link; 618 int error = 0; 619 620 unit = STUNIT(dev); 621 mode = STMODE(dev); 622 dsty = STDSTY(dev); 623 st = st_cd.cd_devs[unit]; 624 sc_link = st->sc_link; 625 626 if (st->flags & ST_MOUNTED) 627 return (0); 628 629 SC_DEBUG(sc_link, SDEV_DB1, ("mounting\n ")); 630 st->flags |= ST_NEW_MOUNT; 631 st->quirks = st->drive_quirks | st->modes[dsty].quirks; 632 /* 633 * If the media is new, then make sure we give it a chance to 634 * to do a 'load' instruction. (We assume it is new.) 635 */ 636 if ((error = st_load(st, LD_LOAD, 0)) != 0) 637 return (error); 638 /* 639 * Throw another dummy instruction to catch 640 * 'Unit attention' errors. Some drives appear to give 641 * these after doing a Load instruction. 642 * (noteably some DAT drives) 643 */ 644 scsipi_test_unit_ready(sc_link, SCSI_SILENT); /* XXX */ 645 646 /* 647 * Some devices can't tell you much until they have been 648 * asked to look at the media. This quirk does this. 649 */ 650 if (st->quirks & ST_Q_SENSE_HELP) 651 if ((error = st_touch_tape(st)) != 0) 652 return (error); 653 /* 654 * Load the physical device parameters 655 * loads: blkmin, blkmax 656 */ 657 if ((error = st_read_block_limits(st, 0)) != 0) 658 return (error); 659 /* 660 * Load the media dependent parameters 661 * includes: media_blksize,media_density,numblks 662 * As we have a tape in, it should be reflected here. 663 * If not you may need the "quirk" above. 664 */ 665 if ((error = st_mode_sense(st, 0)) != 0) 666 return (error); 667 /* 668 * If we have gained a permanent density from somewhere, 669 * then use it in preference to the one supplied by 670 * default by the driver. 671 */ 672 if (st->modeflags[dsty] & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER)) 673 st->density = st->modes[dsty].density; 674 else 675 st->density = st->media_density; 676 /* 677 * If we have gained a permanent blocksize 678 * then use it in preference to the one supplied by 679 * default by the driver. 680 */ 681 st->flags &= ~ST_FIXEDBLOCKS; 682 if (st->modeflags[dsty] & 683 (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) { 684 st->blksize = st->modes[dsty].blksize; 685 if (st->blksize) 686 st->flags |= ST_FIXEDBLOCKS; 687 } else { 688 if ((error = st_decide_mode(st, FALSE)) != 0) 689 return (error); 690 } 691 if ((error = st_mode_select(st, 0)) != 0) { 692 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 693 return (error); 694 } 695 scsipi_prevent(sc_link, PR_PREVENT, 696 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 697 st->flags &= ~ST_NEW_MOUNT; 698 st->flags |= ST_MOUNTED; 699 sc_link->flags |= SDEV_MEDIA_LOADED; /* move earlier? */ 700 701 return (0); 702 } 703 704 /* 705 * End the present mount session. 706 * Rewind, and optionally eject the tape. 707 * Reset various flags to indicate that all new 708 * operations require another mount operation 709 */ 710 void 711 st_unmount(st, eject) 712 struct st_softc *st; 713 boolean eject; 714 { 715 struct scsipi_link *sc_link = st->sc_link; 716 int nmarks; 717 718 if (!(st->flags & ST_MOUNTED)) 719 return; 720 SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n")); 721 st_check_eod(st, FALSE, &nmarks, SCSI_IGNORE_NOT_READY); 722 st_rewind(st, 0, SCSI_IGNORE_NOT_READY); 723 scsipi_prevent(sc_link, PR_ALLOW, 724 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 725 if (eject) 726 st_load(st, LD_UNLOAD, SCSI_IGNORE_NOT_READY); 727 st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT); 728 sc_link->flags &= ~SDEV_MEDIA_LOADED; 729 } 730 731 /* 732 * Given all we know about the device, media, mode, 'quirks' and 733 * initial operation, make a decision as to how we should be set 734 * to run (regarding blocking and EOD marks) 735 */ 736 int 737 st_decide_mode(st, first_read) 738 struct st_softc *st; 739 boolean first_read; 740 { 741 #ifdef SCSIDEBUG 742 struct scsipi_link *sc_link = st->sc_link; 743 #endif 744 745 SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n")); 746 747 /* 748 * If the drive can only handle fixed-length blocks and only at 749 * one size, perhaps we should just do that. 750 */ 751 if (st->blkmin && (st->blkmin == st->blkmax)) { 752 st->flags |= ST_FIXEDBLOCKS; 753 st->blksize = st->blkmin; 754 SC_DEBUG(sc_link, SDEV_DB3, 755 ("blkmin == blkmax of %d\n", st->blkmin)); 756 goto done; 757 } 758 /* 759 * If the tape density mandates (or even suggests) use of fixed 760 * or variable-length blocks, comply. 761 */ 762 switch (st->density) { 763 case HALFINCH_800: 764 case HALFINCH_1600: 765 case HALFINCH_6250: 766 case DDS: 767 st->flags &= ~ST_FIXEDBLOCKS; 768 st->blksize = 0; 769 SC_DEBUG(sc_link, SDEV_DB3, ("density specified variable\n")); 770 goto done; 771 case QIC_11: 772 case QIC_24: 773 case QIC_120: 774 case QIC_150: 775 case QIC_525: 776 case QIC_1320: 777 st->flags |= ST_FIXEDBLOCKS; 778 if (st->media_blksize > 0) 779 st->blksize = st->media_blksize; 780 else 781 st->blksize = DEF_FIXED_BSIZE; 782 SC_DEBUG(sc_link, SDEV_DB3, ("density specified fixed\n")); 783 goto done; 784 } 785 /* 786 * If we're about to read the tape, perhaps we should choose 787 * fixed or variable-length blocks and block size according to 788 * what the drive found on the tape. 789 */ 790 if (first_read && 791 (!(st->quirks & ST_Q_BLKSIZE) || (st->media_blksize == 0) || 792 (st->media_blksize == DEF_FIXED_BSIZE) || 793 (st->media_blksize == 1024))) { 794 if (st->media_blksize > 0) 795 st->flags |= ST_FIXEDBLOCKS; 796 else 797 st->flags &= ~ST_FIXEDBLOCKS; 798 st->blksize = st->media_blksize; 799 SC_DEBUG(sc_link, SDEV_DB3, 800 ("Used media_blksize of %d\n", st->media_blksize)); 801 goto done; 802 } 803 /* 804 * We're getting no hints from any direction. Choose variable- 805 * length blocks arbitrarily. 806 */ 807 st->flags &= ~ST_FIXEDBLOCKS; 808 st->blksize = 0; 809 SC_DEBUG(sc_link, SDEV_DB3, 810 ("Give up and default to variable mode\n")); 811 812 done: 813 /* 814 * Decide whether or not to write two file marks to signify end- 815 * of-data. Make the decision as a function of density. If 816 * the decision is not to use a second file mark, the SCSI BLANK 817 * CHECK condition code will be recognized as end-of-data when 818 * first read. 819 * (I think this should be a by-product of fixed/variable..julian) 820 */ 821 switch (st->density) { 822 /* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ 823 case QIC_11: 824 case QIC_24: 825 case QIC_120: 826 case QIC_150: 827 case QIC_525: 828 case QIC_1320: 829 st->flags &= ~ST_2FM_AT_EOD; 830 break; 831 default: 832 st->flags |= ST_2FM_AT_EOD; 833 } 834 return (0); 835 } 836 837 /* 838 * Actually translate the requested transfer into 839 * one the physical driver can understand 840 * The transfer is described by a buf and will include 841 * only one physical transfer. 842 */ 843 void 844 ststrategy(bp) 845 struct buf *bp; 846 { 847 struct st_softc *st = st_cd.cd_devs[STUNIT(bp->b_dev)]; 848 struct buf *dp; 849 int s; 850 851 SC_DEBUG(st->sc_link, SDEV_DB1, 852 ("ststrategy %ld bytes @ blk %d\n", bp->b_bcount, bp->b_blkno)); 853 /* 854 * If it's a null transfer, return immediatly 855 */ 856 if (bp->b_bcount == 0) 857 goto done; 858 /* 859 * Odd sized request on fixed drives are verboten 860 */ 861 if (st->flags & ST_FIXEDBLOCKS) { 862 if (bp->b_bcount % st->blksize) { 863 printf("%s: bad request, must be multiple of %d\n", 864 st->sc_dev.dv_xname, st->blksize); 865 bp->b_error = EIO; 866 goto bad; 867 } 868 } 869 /* 870 * as are out-of-range requests on variable drives. 871 */ 872 else if (bp->b_bcount < st->blkmin || 873 (st->blkmax && bp->b_bcount > st->blkmax)) { 874 printf("%s: bad request, must be between %d and %d\n", 875 st->sc_dev.dv_xname, st->blkmin, st->blkmax); 876 bp->b_error = EIO; 877 goto bad; 878 } 879 s = splbio(); 880 881 /* 882 * Place it in the queue of activities for this tape 883 * at the end (a bit silly because we only have on user.. 884 * (but it could fork())) 885 */ 886 dp = &st->buf_queue; 887 bp->b_actf = NULL; 888 bp->b_actb = dp->b_actb; 889 *dp->b_actb = bp; 890 dp->b_actb = &bp->b_actf; 891 892 /* 893 * Tell the device to get going on the transfer if it's 894 * not doing anything, otherwise just wait for completion 895 * (All a bit silly if we're only allowing 1 open but..) 896 */ 897 ststart(st); 898 899 splx(s); 900 return; 901 bad: 902 bp->b_flags |= B_ERROR; 903 done: 904 /* 905 * Correctly set the buf to indicate a completed xfer 906 */ 907 bp->b_resid = bp->b_bcount; 908 biodone(bp); 909 return; 910 } 911 912 /* 913 * ststart looks to see if there is a buf waiting for the device 914 * and that the device is not already busy. If both are true, 915 * It dequeues the buf and creates a scsi command to perform the 916 * transfer required. The transfer request will call scsipi_done 917 * on completion, which will in turn call this routine again 918 * so that the next queued transfer is performed. 919 * The bufs are queued by the strategy routine (ststrategy) 920 * 921 * This routine is also called after other non-queued requests 922 * have been made of the scsi driver, to ensure that the queue 923 * continues to be drained. 924 * ststart() is called at splbio 925 */ 926 void 927 ststart(v) 928 void *v; 929 { 930 struct st_softc *st = v; 931 struct scsipi_link *sc_link = st->sc_link; 932 register struct buf *bp, *dp; 933 struct scsi_rw_tape cmd; 934 int flags; 935 936 SC_DEBUG(sc_link, SDEV_DB2, ("ststart ")); 937 /* 938 * See if there is a buf to do and we are not already 939 * doing one 940 */ 941 while (sc_link->openings > 0) { 942 /* if a special awaits, let it proceed first */ 943 if (sc_link->flags & SDEV_WAITING) { 944 sc_link->flags &= ~SDEV_WAITING; 945 wakeup((caddr_t)sc_link); 946 return; 947 } 948 949 dp = &st->buf_queue; 950 if ((bp = dp->b_actf) == NULL) 951 return; 952 if ((dp = bp->b_actf) != NULL) 953 dp->b_actb = bp->b_actb; 954 else 955 st->buf_queue.b_actb = bp->b_actb; 956 *bp->b_actb = dp; 957 958 /* 959 * if the device has been unmounted byt the user 960 * then throw away all requests until done 961 */ 962 if (!(st->flags & ST_MOUNTED) || 963 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 964 /* make sure that one implies the other.. */ 965 sc_link->flags &= ~SDEV_MEDIA_LOADED; 966 bp->b_flags |= B_ERROR; 967 bp->b_error = EIO; 968 bp->b_resid = bp->b_bcount; 969 biodone(bp); 970 continue; 971 } 972 /* 973 * only FIXEDBLOCK devices have pending operations 974 */ 975 if (st->flags & ST_FIXEDBLOCKS) { 976 /* 977 * If we are at a filemark but have not reported it yet 978 * then we should report it now 979 */ 980 if (st->flags & ST_AT_FILEMARK) { 981 if ((bp->b_flags & B_READ) == B_WRITE) { 982 /* 983 * Handling of ST_AT_FILEMARK in 984 * st_space will fill in the right file 985 * mark count. 986 * Back up over filemark 987 */ 988 if (st_space(st, 0, SP_FILEMARKS, 0)) { 989 bp->b_flags |= B_ERROR; 990 bp->b_error = EIO; 991 biodone(bp); 992 continue; 993 } 994 } else { 995 bp->b_resid = bp->b_bcount; 996 bp->b_error = 0; 997 bp->b_flags &= ~B_ERROR; 998 st->flags &= ~ST_AT_FILEMARK; 999 biodone(bp); 1000 continue; /* seek more work */ 1001 } 1002 } 1003 /* 1004 * If we are at EIO (e.g. EOM) but have not reported it 1005 * yet then we should report it now 1006 */ 1007 if (st->flags & ST_EIO_PENDING) { 1008 bp->b_resid = bp->b_bcount; 1009 bp->b_error = EIO; 1010 bp->b_flags |= B_ERROR; 1011 st->flags &= ~ST_EIO_PENDING; 1012 biodone(bp); 1013 continue; /* seek more work */ 1014 } 1015 } 1016 1017 /* 1018 * Fill out the scsi command 1019 */ 1020 bzero(&cmd, sizeof(cmd)); 1021 if ((bp->b_flags & B_READ) == B_WRITE) { 1022 cmd.opcode = WRITE; 1023 st->flags &= ~ST_FM_WRITTEN; 1024 st->flags |= ST_WRITTEN; 1025 flags = SCSI_DATA_OUT; 1026 } else { 1027 cmd.opcode = READ; 1028 flags = SCSI_DATA_IN; 1029 } 1030 1031 /* 1032 * Handle "fixed-block-mode" tape drives by using the 1033 * block count instead of the length. 1034 */ 1035 if (st->flags & ST_FIXEDBLOCKS) { 1036 cmd.byte2 |= SRW_FIXED; 1037 _lto3b(bp->b_bcount / st->blksize, cmd.len); 1038 } else 1039 _lto3b(bp->b_bcount, cmd.len); 1040 1041 /* 1042 * go ask the adapter to do all this for us 1043 */ 1044 if ((*sc_link->scsipi_cmd)(sc_link, 1045 (struct scsipi_generic *)&cmd, sizeof(cmd), 1046 (u_char *)bp->b_data, bp->b_bcount, 1047 0, 100000, bp, flags | SCSI_NOSLEEP)) 1048 printf("%s: not queued\n", st->sc_dev.dv_xname); 1049 } /* go back and see if we can cram more work in.. */ 1050 } 1051 1052 int 1053 stread(dev, uio, iomode) 1054 dev_t dev; 1055 struct uio *uio; 1056 int iomode; 1057 { 1058 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)]; 1059 1060 return (physio(ststrategy, NULL, dev, B_READ, 1061 st->sc_link->adapter->scsipi_minphys, uio)); 1062 } 1063 1064 int 1065 stwrite(dev, uio, iomode) 1066 dev_t dev; 1067 struct uio *uio; 1068 int iomode; 1069 { 1070 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)]; 1071 1072 return (physio(ststrategy, NULL, dev, B_WRITE, 1073 st->sc_link->adapter->scsipi_minphys, uio)); 1074 } 1075 1076 /* 1077 * Perform special action on behalf of the user; 1078 * knows about the internals of this device 1079 */ 1080 int 1081 stioctl(dev, cmd, arg, flag, p) 1082 dev_t dev; 1083 u_long cmd; 1084 caddr_t arg; 1085 int flag; 1086 struct proc *p; 1087 { 1088 int error = 0; 1089 int unit; 1090 int number, nmarks, dsty; 1091 int flags; 1092 struct st_softc *st; 1093 int hold_blksize; 1094 u_int8_t hold_density; 1095 struct mtop *mt = (struct mtop *) arg; 1096 1097 /* 1098 * Find the device that the user is talking about 1099 */ 1100 flags = 0; /* give error messages, act on errors etc. */ 1101 unit = STUNIT(dev); 1102 dsty = STDSTY(dev); 1103 st = st_cd.cd_devs[unit]; 1104 hold_blksize = st->blksize; 1105 hold_density = st->density; 1106 1107 switch ((u_int) cmd) { 1108 1109 case MTIOCGET: { 1110 struct mtget *g = (struct mtget *) arg; 1111 1112 SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: get status]\n")); 1113 bzero(g, sizeof(struct mtget)); 1114 g->mt_type = 0x7; /* Ultrix compat *//*? */ 1115 g->mt_blksiz = st->blksize; 1116 g->mt_density = st->density; 1117 g->mt_mblksiz[0] = st->modes[0].blksize; 1118 g->mt_mblksiz[1] = st->modes[1].blksize; 1119 g->mt_mblksiz[2] = st->modes[2].blksize; 1120 g->mt_mblksiz[3] = st->modes[3].blksize; 1121 g->mt_mdensity[0] = st->modes[0].density; 1122 g->mt_mdensity[1] = st->modes[1].density; 1123 g->mt_mdensity[2] = st->modes[2].density; 1124 g->mt_mdensity[3] = st->modes[3].density; 1125 break; 1126 } 1127 case MTIOCTOP: { 1128 1129 SC_DEBUG(st->sc_link, SDEV_DB1, 1130 ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, 1131 mt->mt_count)); 1132 1133 /* compat: in U*x it is a short */ 1134 number = mt->mt_count; 1135 switch ((short) (mt->mt_op)) { 1136 case MTWEOF: /* write an end-of-file record */ 1137 error = st_write_filemarks(st, number, flags); 1138 break; 1139 case MTBSF: /* backward space file */ 1140 number = -number; 1141 case MTFSF: /* forward space file */ 1142 error = st_check_eod(st, FALSE, &nmarks, flags); 1143 if (!error) 1144 error = st_space(st, number - nmarks, 1145 SP_FILEMARKS, flags); 1146 break; 1147 case MTBSR: /* backward space record */ 1148 number = -number; 1149 case MTFSR: /* forward space record */ 1150 error = st_check_eod(st, TRUE, &nmarks, flags); 1151 if (!error) 1152 error = st_space(st, number, SP_BLKS, flags); 1153 break; 1154 case MTREW: /* rewind */ 1155 error = st_rewind(st, 0, flags); 1156 break; 1157 case MTOFFL: /* rewind and put the drive offline */ 1158 st_unmount(st, EJECT); 1159 break; 1160 case MTNOP: /* no operation, sets status only */ 1161 break; 1162 case MTRETEN: /* retension the tape */ 1163 error = st_load(st, LD_RETENSION, flags); 1164 if (!error) 1165 error = st_load(st, LD_LOAD, flags); 1166 break; 1167 case MTEOM: /* forward space to end of media */ 1168 error = st_check_eod(st, FALSE, &nmarks, flags); 1169 if (!error) 1170 error = st_space(st, 1, SP_EOM, flags); 1171 break; 1172 case MTCACHE: /* enable controller cache */ 1173 st->flags &= ~ST_DONTBUFFER; 1174 goto try_new_value; 1175 case MTNOCACHE: /* disable controller cache */ 1176 st->flags |= ST_DONTBUFFER; 1177 goto try_new_value; 1178 case MTERASE: /* erase volume */ 1179 error = st_erase(st, number, flags); 1180 break; 1181 case MTSETBSIZ: /* Set block size for device */ 1182 #ifdef NOTYET 1183 if (!(st->flags & ST_NEW_MOUNT)) { 1184 uprintf("re-mount tape before changing blocksize"); 1185 error = EINVAL; 1186 break; 1187 } 1188 #endif 1189 if (number == 0) 1190 st->flags &= ~ST_FIXEDBLOCKS; 1191 else { 1192 if ((st->blkmin || st->blkmax) && 1193 (number < st->blkmin || 1194 number > st->blkmax)) { 1195 error = EINVAL; 1196 break; 1197 } 1198 st->flags |= ST_FIXEDBLOCKS; 1199 } 1200 st->blksize = number; 1201 st->flags |= ST_BLOCK_SET; /*XXX */ 1202 goto try_new_value; 1203 1204 case MTSETDNSTY: /* Set density for device and mode */ 1205 if (number > SCSI_2_MAX_DENSITY_CODE) { 1206 error = EINVAL; 1207 break; 1208 } else 1209 st->density = number; 1210 goto try_new_value; 1211 1212 case MTCMPRESS: 1213 error = st_cmprss(st, number); 1214 break; 1215 1216 default: 1217 error = EINVAL; 1218 } 1219 break; 1220 } 1221 case MTIOCIEOT: 1222 case MTIOCEEOT: 1223 break; 1224 1225 case MTIOCRDSPOS: 1226 error = st_rdpos(st, 0, (u_int32_t *) arg); 1227 break; 1228 1229 case MTIOCRDHPOS: 1230 error = st_rdpos(st, 1, (u_int32_t *) arg); 1231 break; 1232 1233 case MTIOCSLOCATE: 1234 error = st_setpos(st, 0, (u_int32_t *) arg); 1235 break; 1236 1237 case MTIOCHLOCATE: 1238 error = st_setpos(st, 1, (u_int32_t *) arg); 1239 break; 1240 1241 default: 1242 if (STMODE(dev) == CTLMODE) 1243 error = scsipi_do_ioctl(st->sc_link, dev, cmd, arg, 1244 flag, p); 1245 else 1246 error = ENOTTY; 1247 break; 1248 } 1249 return (error); 1250 /*-----------------------------*/ 1251 try_new_value: 1252 /* 1253 * Check that the mode being asked for is aggreeable to the 1254 * drive. If not, put it back the way it was. 1255 */ 1256 if ((error = st_mode_select(st, 0)) != 0) {/* put it back as it was */ 1257 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 1258 st->density = hold_density; 1259 st->blksize = hold_blksize; 1260 if (st->blksize) 1261 st->flags |= ST_FIXEDBLOCKS; 1262 else 1263 st->flags &= ~ST_FIXEDBLOCKS; 1264 return (error); 1265 } 1266 /* 1267 * As the drive liked it, if we are setting a new default, 1268 * set it into the structures as such. 1269 * 1270 * The means for deciding this are not finalised yet 1271 */ 1272 if (STMODE(dev) == 0x03) { 1273 /* special mode */ 1274 /* XXX */ 1275 switch ((short) (mt->mt_op)) { 1276 case MTSETBSIZ: 1277 st->modes[dsty].blksize = st->blksize; 1278 st->modeflags[dsty] |= BLKSIZE_SET_BY_USER; 1279 break; 1280 case MTSETDNSTY: 1281 st->modes[dsty].density = st->density; 1282 st->modeflags[dsty] |= DENSITY_SET_BY_USER; 1283 break; 1284 } 1285 } 1286 return (0); 1287 } 1288 1289 /* 1290 * Do a synchronous read. 1291 */ 1292 int 1293 st_read(st, buf, size, flags) 1294 struct st_softc *st; 1295 int size; 1296 int flags; 1297 char *buf; 1298 { 1299 struct scsi_rw_tape cmd; 1300 1301 /* 1302 * If it's a null transfer, return immediatly 1303 */ 1304 if (size == 0) 1305 return (0); 1306 bzero(&cmd, sizeof(cmd)); 1307 cmd.opcode = READ; 1308 if (st->flags & ST_FIXEDBLOCKS) { 1309 cmd.byte2 |= SRW_FIXED; 1310 _lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE), 1311 cmd.len); 1312 } else 1313 _lto3b(size, cmd.len); 1314 return ((*st->sc_link->scsipi_cmd)(st->sc_link, 1315 (struct scsipi_generic *)&cmd, sizeof(cmd), 1316 (u_char *)buf, size, 0, 100000, NULL, flags | SCSI_DATA_IN)); 1317 } 1318 1319 /* 1320 * Ask the drive what it's min and max blk sizes are. 1321 */ 1322 int 1323 st_read_block_limits(st, flags) 1324 struct st_softc *st; 1325 int flags; 1326 { 1327 struct scsi_block_limits cmd; 1328 struct scsi_block_limits_data block_limits; 1329 struct scsipi_link *sc_link = st->sc_link; 1330 int error; 1331 1332 /* 1333 * First check if we have it all loaded 1334 */ 1335 if ((sc_link->flags & SDEV_MEDIA_LOADED)) 1336 return (0); 1337 1338 /* 1339 * do a 'Read Block Limits' 1340 */ 1341 bzero(&cmd, sizeof(cmd)); 1342 cmd.opcode = READ_BLOCK_LIMITS; 1343 1344 /* 1345 * do the command, update the global values 1346 */ 1347 error = (*sc_link->scsipi_cmd)(sc_link, (struct scsipi_generic *)&cmd, 1348 sizeof(cmd), (u_char *)&block_limits, sizeof(block_limits), 1349 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN); 1350 if (error) 1351 return (error); 1352 1353 st->blkmin = _2btol(block_limits.min_length); 1354 st->blkmax = _3btol(block_limits.max_length); 1355 1356 SC_DEBUG(sc_link, SDEV_DB3, 1357 ("(%d <= blksize <= %d)\n", st->blkmin, st->blkmax)); 1358 return (0); 1359 } 1360 1361 /* 1362 * Get the scsi driver to send a full inquiry to the 1363 * device and use the results to fill out the global 1364 * parameter structure. 1365 * 1366 * called from: 1367 * attach 1368 * open 1369 * ioctl (to reset original blksize) 1370 */ 1371 int 1372 st_mode_sense(st, flags) 1373 struct st_softc *st; 1374 int flags; 1375 { 1376 u_int scsipi_sense_len; 1377 int error; 1378 struct scsi_mode_sense cmd; 1379 struct scsipi_sense { 1380 struct scsi_mode_header header; 1381 struct scsi_blk_desc blk_desc; 1382 u_char sense_data[MAX_PAGE_0_SIZE]; 1383 } scsipi_sense; 1384 struct scsipi_link *sc_link = st->sc_link; 1385 1386 scsipi_sense_len = 12 + st->page_0_size; 1387 1388 /* 1389 * Set up a mode sense 1390 */ 1391 bzero(&cmd, sizeof(cmd)); 1392 cmd.opcode = SCSI_MODE_SENSE; 1393 cmd.length = scsipi_sense_len; 1394 1395 /* 1396 * do the command, but we don't need the results 1397 * just print them for our interest's sake, if asked, 1398 * or if we need it as a template for the mode select 1399 * store it away. 1400 */ 1401 error = (*sc_link->scsipi_cmd)(sc_link, (struct scsipi_generic *)&cmd, 1402 sizeof(cmd), (u_char *)&scsipi_sense, scsipi_sense_len, 1403 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN); 1404 if (error) 1405 return (error); 1406 1407 st->numblks = _3btol(scsipi_sense.blk_desc.nblocks); 1408 st->media_blksize = _3btol(scsipi_sense.blk_desc.blklen); 1409 st->media_density = scsipi_sense.blk_desc.density; 1410 if (scsipi_sense.header.dev_spec & SMH_DSP_WRITE_PROT) 1411 st->flags |= ST_READONLY; 1412 SC_DEBUG(sc_link, SDEV_DB3, 1413 ("density code 0x%x, %d-byte blocks, write-%s, ", 1414 st->media_density, st->media_blksize, 1415 st->flags & ST_READONLY ? "protected" : "enabled")); 1416 SC_DEBUG(sc_link, SDEV_DB3, 1417 ("%sbuffered\n", 1418 scsipi_sense.header.dev_spec & SMH_DSP_BUFF_MODE ? "" : "un")); 1419 if (st->page_0_size) 1420 bcopy(scsipi_sense.sense_data, st->sense_data, 1421 st->page_0_size); 1422 sc_link->flags |= SDEV_MEDIA_LOADED; 1423 return (0); 1424 } 1425 1426 /* 1427 * Send a filled out parameter structure to the drive to 1428 * set it into the desire modes etc. 1429 */ 1430 int 1431 st_mode_select(st, flags) 1432 struct st_softc *st; 1433 int flags; 1434 { 1435 u_int scsi_select_len; 1436 struct scsi_mode_select cmd; 1437 struct scsi_select { 1438 struct scsi_mode_header header; 1439 struct scsi_blk_desc blk_desc; 1440 u_char sense_data[MAX_PAGE_0_SIZE]; 1441 } scsi_select; 1442 struct scsipi_link *sc_link = st->sc_link; 1443 1444 scsi_select_len = 12 + st->page_0_size; 1445 1446 /* 1447 * This quirk deals with drives that have only one valid mode 1448 * and think this gives them license to reject all mode selects, 1449 * even if the selected mode is the one that is supported. 1450 */ 1451 if (st->quirks & ST_Q_UNIMODAL) { 1452 SC_DEBUG(sc_link, SDEV_DB3, 1453 ("not setting density 0x%x blksize 0x%x\n", 1454 st->density, st->blksize)); 1455 return (0); 1456 } 1457 1458 /* 1459 * Set up for a mode select 1460 */ 1461 bzero(&cmd, sizeof(cmd)); 1462 cmd.opcode = SCSI_MODE_SELECT; 1463 cmd.length = scsi_select_len; 1464 1465 bzero(&scsi_select, scsi_select_len); 1466 scsi_select.header.blk_desc_len = sizeof(struct scsi_blk_desc); 1467 scsi_select.header.dev_spec &= ~SMH_DSP_BUFF_MODE; 1468 scsi_select.blk_desc.density = st->density; 1469 if (st->flags & ST_DONTBUFFER) 1470 scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_OFF; 1471 else 1472 scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_ON; 1473 if (st->flags & ST_FIXEDBLOCKS) 1474 _lto3b(st->blksize, scsi_select.blk_desc.blklen); 1475 if (st->page_0_size) 1476 bcopy(st->sense_data, scsi_select.sense_data, st->page_0_size); 1477 1478 /* 1479 * do the command 1480 */ 1481 return ((*sc_link->scsipi_cmd)(sc_link, (struct scsipi_generic *)&cmd, 1482 sizeof(cmd), (u_char *)&scsi_select, scsi_select_len, 1483 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_OUT)); 1484 } 1485 1486 int 1487 st_cmprss(st, onoff) 1488 struct st_softc *st; 1489 int onoff; 1490 { 1491 u_int scsi_dlen; 1492 struct scsi_mode_select mcmd; 1493 struct scsi_mode_sense scmd; 1494 struct scsi_select { 1495 struct scsi_mode_header header; 1496 struct scsi_blk_desc blk_desc; 1497 u_char pdata[max(sizeof(struct scsi_tape_dev_conf_page), 1498 sizeof(struct scsi_tape_dev_compression_page))]; 1499 } scsi_pdata; 1500 struct scsi_tape_dev_conf_page *ptr; 1501 struct scsi_tape_dev_compression_page *cptr; 1502 struct scsipi_link *sc_link = st->sc_link; 1503 int error, ison, flags; 1504 1505 scsi_dlen = sizeof(scsi_pdata); 1506 bzero(&scsi_pdata, scsi_dlen); 1507 1508 /* 1509 * Set up for a mode sense. 1510 * Do DATA COMPRESSION page first. 1511 */ 1512 bzero(&scmd, sizeof(scmd)); 1513 scmd.opcode = SCSI_MODE_SENSE; 1514 scmd.page = SMS_PAGE_CTRL_CURRENT | 0xf; 1515 scmd.length = scsi_dlen; 1516 1517 flags = SCSI_SILENT; 1518 1519 /* 1520 * Do the MODE SENSE command... 1521 */ 1522 again: 1523 error = (*sc_link->scsipi_cmd)(sc_link, 1524 (struct scsipi_generic *)&scmd, sizeof(scmd), 1525 (u_char *)&scsi_pdata, scsi_dlen, 1526 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN); 1527 1528 if (error) { 1529 if (scmd.byte2 != SMS_DBD) { 1530 scmd.byte2 = SMS_DBD; 1531 goto again; 1532 } 1533 return (error); 1534 } 1535 1536 if (scsi_pdata.header.blk_desc_len) 1537 ptr = (struct scsi_tape_dev_conf_page *) scsi_pdata.pdata; 1538 else 1539 ptr = (struct scsi_tape_dev_conf_page *) &scsi_pdata.blk_desc; 1540 1541 if ((scmd.page & SMS_PAGE_CODE) == 0xf) { 1542 cptr = (struct scsi_tape_dev_compression_page *) ptr; 1543 ison = (cptr->dce_dcc & DCP_DCE) != 0; 1544 if (onoff) 1545 cptr->dce_dcc |= DCP_DCE; 1546 else 1547 cptr->dce_dcc &= ~DCP_DCE; 1548 cptr->pagecode &= ~0x80; 1549 } else { 1550 ison = (ptr->sel_comp_alg != 0); 1551 if (onoff) 1552 ptr->sel_comp_alg = 1; 1553 else 1554 ptr->sel_comp_alg = 0; 1555 ptr->pagecode &= ~0x80; 1556 } 1557 onoff = onoff ? 1 : 0; 1558 /* 1559 * There might be a virtue in actually doing the MODE SELECTS, 1560 * but let's not clog the bus over it. 1561 */ 1562 if (onoff == ison) 1563 return (0); 1564 1565 /* 1566 * Set up for a mode select 1567 */ 1568 1569 scsi_pdata.header.data_length = 0; 1570 scsi_pdata.header.medium_type = 0; 1571 if ((st->flags & ST_DONTBUFFER) == 0) 1572 scsi_pdata.header.dev_spec = SMH_DSP_BUFF_MODE_ON; 1573 else 1574 scsi_pdata.header.dev_spec = 0; 1575 1576 bzero(&mcmd, sizeof(mcmd)); 1577 mcmd.opcode = SCSI_MODE_SELECT; 1578 mcmd.byte2 = SMS_PF; 1579 mcmd.length = scsi_dlen; 1580 if (scsi_pdata.header.blk_desc_len) { 1581 scsi_pdata.blk_desc.density = 0; 1582 scsi_pdata.blk_desc.nblocks[0] = 0; 1583 scsi_pdata.blk_desc.nblocks[1] = 0; 1584 scsi_pdata.blk_desc.nblocks[2] = 0; 1585 } 1586 1587 /* 1588 * Do the command 1589 */ 1590 error = (*sc_link->scsipi_cmd)(sc_link, 1591 (struct scsipi_generic *)&mcmd, sizeof(mcmd), 1592 (u_char *)&scsi_pdata, scsi_dlen, 1593 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_OUT); 1594 1595 if (error && (scmd.page & SMS_PAGE_CODE) == 0xf) { 1596 /* 1597 * Try DEVICE CONFIGURATION page. 1598 */ 1599 scmd.page = SMS_PAGE_CTRL_CURRENT | 0x10; 1600 goto again; 1601 } 1602 return (error); 1603 } 1604 /* 1605 * issue an erase command 1606 */ 1607 int 1608 st_erase(st, full, flags) 1609 struct st_softc *st; 1610 int full, flags; 1611 { 1612 struct scsi_erase cmd; 1613 1614 /* 1615 * Full erase means set LONG bit in erase command, which asks 1616 * the drive to erase the entire unit. Without this bit, we're 1617 * asking the drive to write an erase gap. 1618 */ 1619 bzero(&cmd, sizeof(cmd)); 1620 cmd.opcode = ERASE; 1621 if (full) 1622 cmd.byte2 = SE_IMMED|SE_LONG; 1623 else 1624 cmd.byte2 = SE_IMMED; 1625 1626 /* 1627 * XXX We always do this asynchronously, for now. How long should 1628 * we wait if we want to (eventually) to it synchronously? 1629 */ 1630 return ((*st->sc_link->scsipi_cmd)(st->sc_link, 1631 (struct scsipi_generic *)&cmd, sizeof(cmd), 1632 0, 0, ST_RETRIES, 5000, NULL, flags)); 1633 } 1634 1635 /* 1636 * skip N blocks/filemarks/seq filemarks/eom 1637 */ 1638 int 1639 st_space(st, number, what, flags) 1640 struct st_softc *st; 1641 u_int what; 1642 int flags; 1643 int number; 1644 { 1645 struct scsi_space cmd; 1646 int error; 1647 1648 switch (what) { 1649 case SP_BLKS: 1650 if (st->flags & ST_PER_ACTION) { 1651 if (number > 0) { 1652 st->flags &= ~ST_PER_ACTION; 1653 return (EIO); 1654 } else if (number < 0) { 1655 if (st->flags & ST_AT_FILEMARK) { 1656 /* 1657 * Handling of ST_AT_FILEMARK 1658 * in st_space will fill in the 1659 * right file mark count. 1660 */ 1661 error = st_space(st, 0, SP_FILEMARKS, 1662 flags); 1663 if (error) 1664 return (error); 1665 } 1666 if (st->flags & ST_BLANK_READ) { 1667 st->flags &= ~ST_BLANK_READ; 1668 return (EIO); 1669 } 1670 st->flags &= ~ST_EIO_PENDING; 1671 } 1672 } 1673 break; 1674 case SP_FILEMARKS: 1675 if (st->flags & ST_EIO_PENDING) { 1676 if (number > 0) { 1677 /* pretend we just discovered the error */ 1678 st->flags &= ~ST_EIO_PENDING; 1679 return (EIO); 1680 } else if (number < 0) { 1681 /* back away from the error */ 1682 st->flags &= ~ST_EIO_PENDING; 1683 } 1684 } 1685 if (st->flags & ST_AT_FILEMARK) { 1686 st->flags &= ~ST_AT_FILEMARK; 1687 number--; 1688 } 1689 if ((st->flags & ST_BLANK_READ) && (number < 0)) { 1690 /* back away from unwritten tape */ 1691 st->flags &= ~ST_BLANK_READ; 1692 number++; /* XXX dubious */ 1693 } 1694 break; 1695 case SP_EOM: 1696 if (st->flags & ST_EIO_PENDING) { 1697 /* pretend we just discovered the error */ 1698 st->flags &= ~ST_EIO_PENDING; 1699 return (EIO); 1700 } 1701 if (st->flags & ST_AT_FILEMARK) 1702 st->flags &= ~ST_AT_FILEMARK; 1703 break; 1704 } 1705 if (number == 0) 1706 return (0); 1707 1708 bzero(&cmd, sizeof(cmd)); 1709 cmd.opcode = SPACE; 1710 cmd.byte2 = what; 1711 _lto3b(number, cmd.number); 1712 1713 return ((*st->sc_link->scsipi_cmd)(st->sc_link, 1714 (struct scsipi_generic *)&cmd, sizeof(cmd), 1715 0, 0, 0, 900000, NULL, flags)); 1716 } 1717 1718 /* 1719 * write N filemarks 1720 */ 1721 int 1722 st_write_filemarks(st, number, flags) 1723 struct st_softc *st; 1724 int flags; 1725 int number; 1726 { 1727 struct scsi_write_filemarks cmd; 1728 1729 /* 1730 * It's hard to write a negative number of file marks. 1731 * Don't try. 1732 */ 1733 if (number < 0) 1734 return (EINVAL); 1735 switch (number) { 1736 case 0: /* really a command to sync the drive's buffers */ 1737 break; 1738 case 1: 1739 if (st->flags & ST_FM_WRITTEN) /* already have one down */ 1740 st->flags &= ~ST_WRITTEN; 1741 else 1742 st->flags |= ST_FM_WRITTEN; 1743 st->flags &= ~ST_PER_ACTION; 1744 break; 1745 default: 1746 st->flags &= ~(ST_PER_ACTION | ST_WRITTEN); 1747 } 1748 1749 bzero(&cmd, sizeof(cmd)); 1750 cmd.opcode = WRITE_FILEMARKS; 1751 _lto3b(number, cmd.number); 1752 1753 return ((*st->sc_link->scsipi_cmd)(st->sc_link, 1754 (struct scsipi_generic *)&cmd, sizeof(cmd), 1755 0, 0, 0, 100000, NULL, flags)); 1756 } 1757 1758 /* 1759 * Make sure the right number of file marks is on tape if the 1760 * tape has been written. If the position argument is true, 1761 * leave the tape positioned where it was originally. 1762 * 1763 * nmarks returns the number of marks to skip (or, if position 1764 * true, which were skipped) to get back original position. 1765 */ 1766 int 1767 st_check_eod(st, position, nmarks, flags) 1768 struct st_softc *st; 1769 boolean position; 1770 int *nmarks; 1771 int flags; 1772 { 1773 int error; 1774 1775 switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) { 1776 default: 1777 *nmarks = 0; 1778 return (0); 1779 case ST_WRITTEN: 1780 case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD: 1781 *nmarks = 1; 1782 break; 1783 case ST_WRITTEN | ST_2FM_AT_EOD: 1784 *nmarks = 2; 1785 } 1786 error = st_write_filemarks(st, *nmarks, flags); 1787 if (position && !error) 1788 error = st_space(st, -*nmarks, SP_FILEMARKS, flags); 1789 return (error); 1790 } 1791 1792 /* 1793 * load/unload/retension 1794 */ 1795 int 1796 st_load(st, type, flags) 1797 struct st_softc *st; 1798 u_int type; 1799 int flags; 1800 { 1801 struct scsi_load cmd; 1802 1803 if (type != LD_LOAD) { 1804 int error; 1805 int nmarks; 1806 1807 error = st_check_eod(st, FALSE, &nmarks, flags); 1808 if (error) 1809 return (error); 1810 } 1811 if (st->quirks & ST_Q_IGNORE_LOADS) 1812 return (0); 1813 1814 bzero(&cmd, sizeof(cmd)); 1815 cmd.opcode = LOAD; 1816 cmd.how = type; 1817 1818 return ((*st->sc_link->scsipi_cmd)(st->sc_link, 1819 (struct scsipi_generic *)&cmd, sizeof(cmd), 1820 0, 0, ST_RETRIES, 300000, NULL, flags)); 1821 } 1822 1823 /* 1824 * Rewind the device 1825 */ 1826 int 1827 st_rewind(st, immediate, flags) 1828 struct st_softc *st; 1829 u_int immediate; 1830 int flags; 1831 { 1832 struct scsi_rewind cmd; 1833 int error; 1834 int nmarks; 1835 1836 error = st_check_eod(st, FALSE, &nmarks, flags); 1837 if (error) 1838 return (error); 1839 st->flags &= ~ST_PER_ACTION; 1840 1841 bzero(&cmd, sizeof(cmd)); 1842 cmd.opcode = REWIND; 1843 cmd.byte2 = immediate; 1844 1845 return ((*st->sc_link->scsipi_cmd)(st->sc_link, 1846 (struct scsipi_generic *)&cmd, sizeof(cmd), 1847 0, 0, ST_RETRIES, immediate ? 5000 : 300000, NULL, flags)); 1848 } 1849 1850 int 1851 st_rdpos(st, hard, blkptr) 1852 struct st_softc *st; 1853 int hard; 1854 u_int32_t *blkptr; 1855 { 1856 int error; 1857 u_int8_t posdata[20]; 1858 struct scsi_tape_read_position cmd; 1859 1860 /* 1861 * First flush any pending writes... 1862 */ 1863 error = st_write_filemarks(st, 0, SCSI_SILENT); 1864 1865 /* 1866 * The latter case is for 'write protected' tapes 1867 * which are too stupid to recognize a zero count 1868 * for writing filemarks as a no-op. 1869 */ 1870 if (error != 0 && error != EACCES) 1871 return (error); 1872 1873 bzero(&cmd, sizeof(cmd)); 1874 bzero(&posdata, sizeof(posdata)); 1875 cmd.opcode = READ_POSITION; 1876 if (hard) 1877 cmd.byte1 = 1; 1878 1879 error = st->sc_link->scsipi_cmd(st->sc_link, 1880 (struct scsipi_generic *)&cmd, sizeof(cmd), (u_char *)&posdata, 1881 sizeof(posdata), ST_RETRIES, 30000, NULL, SCSI_DATA_IN); 1882 1883 if (error == 0) { 1884 #if 0 1885 printf("posdata:"); 1886 for (hard = 0; hard < sizeof(posdata); hard++) 1887 printf("%02x ", posdata[hard] & 0xff); 1888 printf("\n"); 1889 #endif 1890 if (posdata[0] & 0x4) /* Block Position Unknown */ 1891 error = EINVAL; 1892 else { 1893 *blkptr = _4btol(&posdata[4]); 1894 } 1895 } 1896 return (error); 1897 } 1898 1899 int 1900 st_setpos(st, hard, blkptr) 1901 struct st_softc *st; 1902 int hard; 1903 u_int32_t *blkptr; 1904 { 1905 int error; 1906 struct scsipi_generic cmd; 1907 1908 /* 1909 * First flush any pending writes. Strictly speaking, 1910 * we're not supposed to have to worry about this, 1911 * but let's be untrusting. 1912 */ 1913 error = st_write_filemarks(st, 0, SCSI_SILENT); 1914 1915 /* 1916 * The latter case is for 'write protected' tapes 1917 * which are too stupid to recognize a zero count 1918 * for writing filemarks as a no-op. 1919 */ 1920 if (error != 0 && error != EACCES) 1921 return (error); 1922 1923 bzero(&cmd, sizeof(cmd)); 1924 cmd.opcode = LOCATE; 1925 if (hard) 1926 cmd.bytes[0] = 1 << 2; 1927 _lto4b(*blkptr, &cmd.bytes[2]); 1928 error = (*st->sc_link->scsipi_cmd)(st->sc_link, &cmd, sizeof(cmd), 1929 NULL, 0, ST_RETRIES, 5000, NULL, 0); 1930 /* 1931 * XXX: Note file && block number position now unknown (if 1932 * XXX: these things ever start being maintained in this driver) 1933 */ 1934 return (error); 1935 } 1936 1937 1938 /* 1939 * Look at the returned sense and act on the error and detirmine 1940 * The unix error number to pass back... (0 = report no error) 1941 * (-1 = continue processing) 1942 */ 1943 int 1944 st_interpret_sense(xs) 1945 struct scsipi_xfer *xs; 1946 { 1947 struct scsipi_link *sc_link = xs->sc_link; 1948 struct scsipi_sense_data *sense = &xs->sense.scsi_sense; 1949 struct buf *bp = xs->bp; 1950 struct st_softc *st = sc_link->device_softc; 1951 u_int8_t key; 1952 int32_t info; 1953 1954 /* 1955 * Get the sense fields and work out what code 1956 */ 1957 if (sense->error_code & SSD_ERRCODE_VALID) 1958 info = _4btol(sense->info); 1959 else 1960 info = xs->datalen; /* bad choice if fixed blocks */ 1961 if ((sense->error_code & SSD_ERRCODE) != 0x70) 1962 return (-1); /* let the generic code handle it */ 1963 #ifdef SCSIVERBOSE 1964 else if ((xs->flags & SCSI_SILENT) == 0) 1965 scsi_print_sense(xs, 0); /* tell folks what happened */ 1966 #endif 1967 if (st->flags & ST_FIXEDBLOCKS) { 1968 xs->resid = info * st->blksize; 1969 if (sense->flags & SSD_EOM) { 1970 st->flags |= ST_EIO_PENDING; 1971 if (bp) 1972 bp->b_resid = xs->resid; 1973 } 1974 if (sense->flags & SSD_FILEMARK) { 1975 st->flags |= ST_AT_FILEMARK; 1976 if (bp) 1977 bp->b_resid = xs->resid; 1978 } 1979 if (sense->flags & SSD_ILI) { 1980 st->flags |= ST_EIO_PENDING; 1981 if (bp) 1982 bp->b_resid = xs->resid; 1983 if (sense->error_code & SSD_ERRCODE_VALID && 1984 (xs->flags & SCSI_SILENT) == 0) 1985 printf("%s: block wrong size, %d blocks residual\n", 1986 st->sc_dev.dv_xname, info); 1987 1988 /* 1989 * This quirk code helps the drive read 1990 * the first tape block, regardless of 1991 * format. That is required for these 1992 * drives to return proper MODE SENSE 1993 * information. 1994 */ 1995 if ((st->quirks & ST_Q_SENSE_HELP) && 1996 !(sc_link->flags & SDEV_MEDIA_LOADED)) 1997 st->blksize -= 512; 1998 } 1999 /* 2000 * If no data was tranfered, do it immediatly 2001 */ 2002 if (xs->resid >= xs->datalen) { 2003 if (st->flags & ST_EIO_PENDING) 2004 return (EIO); 2005 if (st->flags & ST_AT_FILEMARK) { 2006 if (bp) 2007 bp->b_resid = xs->resid; 2008 return (0); 2009 } 2010 } 2011 } else { /* must be variable mode */ 2012 xs->resid = xs->datalen; /* to be sure */ 2013 if (sense->flags & SSD_EOM) 2014 return (EIO); 2015 if (sense->flags & SSD_FILEMARK) { 2016 if (bp) 2017 bp->b_resid = bp->b_bcount; 2018 return (0); 2019 } 2020 if (sense->flags & SSD_ILI) { 2021 if (info < 0) { 2022 /* 2023 * the record was bigger than the read 2024 */ 2025 if ((xs->flags & SCSI_SILENT) == 0) 2026 printf("%s: %d-byte record too big\n", 2027 st->sc_dev.dv_xname, 2028 xs->datalen - info); 2029 return (EIO); 2030 } 2031 xs->resid = info; 2032 if (bp) 2033 bp->b_resid = info; 2034 } 2035 } 2036 key = sense->flags & SSD_KEY; 2037 2038 if (key == 0x8) { 2039 /* 2040 * This quirk code helps the drive read the 2041 * first tape block, regardless of format. That 2042 * is required for these drives to return proper 2043 * MODE SENSE information. 2044 */ 2045 if ((st->quirks & ST_Q_SENSE_HELP) && 2046 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 2047 /* still starting */ 2048 st->blksize -= 512; 2049 } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) { 2050 st->flags |= ST_BLANK_READ; 2051 xs->resid = xs->datalen; 2052 if (bp) { 2053 bp->b_resid = xs->resid; 2054 /* return an EOF */ 2055 } 2056 return (0); 2057 } 2058 } 2059 return (-1); /* let the default/generic handler handle it */ 2060 } 2061 2062 /* 2063 * The quirk here is that the drive returns some value to st_mode_sense 2064 * incorrectly until the tape has actually passed by the head. 2065 * 2066 * The method is to set the drive to large fixed-block state (user-specified 2067 * density and 1024-byte blocks), then read and rewind to get it to sense the 2068 * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't 2069 * work, as a last resort, try variable- length blocks. The result will be 2070 * the ability to do an accurate st_mode_sense. 2071 * 2072 * We know we can do a rewind because we just did a load, which implies rewind. 2073 * Rewind seems preferable to space backward if we have a virgin tape. 2074 * 2075 * The rest of the code for this quirk is in ILI processing and BLANK CHECK 2076 * error processing, both part of st_interpret_sense. 2077 */ 2078 int 2079 st_touch_tape(st) 2080 struct st_softc *st; 2081 { 2082 char *buf; 2083 int readsize; 2084 int error; 2085 2086 buf = malloc(1024, M_TEMP, M_NOWAIT); 2087 if (buf == NULL) 2088 return (ENOMEM); 2089 2090 if ((error = st_mode_sense(st, 0)) != 0) 2091 goto bad; 2092 st->blksize = 1024; 2093 do { 2094 switch (st->blksize) { 2095 case 512: 2096 case 1024: 2097 readsize = st->blksize; 2098 st->flags |= ST_FIXEDBLOCKS; 2099 break; 2100 default: 2101 readsize = 1; 2102 st->flags &= ~ST_FIXEDBLOCKS; 2103 } 2104 if ((error = st_mode_select(st, 0)) != 0) 2105 goto bad; 2106 st_read(st, buf, readsize, SCSI_SILENT); /* XXX */ 2107 if ((error = st_rewind(st, 0, 0)) != 0) { 2108 bad: free(buf, M_TEMP); 2109 return (error); 2110 } 2111 } while (readsize != 1 && readsize > st->blksize); 2112 2113 free(buf, M_TEMP); 2114 return (0); 2115 } 2116 2117 int 2118 stdump(dev, blkno, va, size) 2119 dev_t dev; 2120 daddr_t blkno; 2121 caddr_t va; 2122 size_t size; 2123 { 2124 2125 /* Not implemented. */ 2126 return (ENXIO); 2127 } 2128