1 /* $NetBSD: st.c,v 1.55 1995/11/30 10:12:04 pk 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 <sys/types.h> 57 #include <sys/param.h> 58 #include <sys/systm.h> 59 #include <sys/fcntl.h> 60 #include <sys/errno.h> 61 #include <sys/ioctl.h> 62 #include <sys/malloc.h> 63 #include <sys/buf.h> 64 #include <sys/proc.h> 65 #include <sys/user.h> 66 #include <sys/mtio.h> 67 #include <sys/device.h> 68 69 #include <scsi/scsi_all.h> 70 #include <scsi/scsi_tape.h> 71 #include <scsi/scsiconf.h> 72 73 /* Defines for device specific stuff */ 74 #define DEF_FIXED_BSIZE 512 75 #define ST_RETRIES 4 /* only on non IO commands */ 76 77 #define STMODE(z) ( minor(z) & 0x03) 78 #define STDSTY(z) ((minor(z) >> 2) & 0x03) 79 #define STUNIT(z) ((minor(z) >> 4) ) 80 #define CTLMODE 3 81 82 #define SCSI_2_MAX_DENSITY_CODE 0x17 /* maximum density code specified 83 * in SCSI II spec. */ 84 /* 85 * Define various devices that we know mis-behave in some way, 86 * and note how they are bad, so we can correct for them 87 */ 88 struct modes { 89 u_int quirks; /* same definitions as in quirkdata */ 90 int blksize; 91 u_int8_t density; 92 }; 93 94 struct quirkdata { 95 u_int quirks; 96 #define ST_Q_FORCE_BLKSIZE 0x0001 97 #define ST_Q_SENSE_HELP 0x0002 /* must do READ for good MODE SENSE */ 98 #define ST_Q_IGNORE_LOADS 0x0004 99 #define ST_Q_BLKSIZE 0x0008 /* variable-block media_blksize > 0 */ 100 u_int page_0_size; 101 #define MAX_PAGE_0_SIZE 64 102 struct modes modes[4]; 103 }; 104 105 struct st_quirk_inquiry_pattern { 106 struct scsi_inquiry_pattern pattern; 107 struct quirkdata quirkdata; 108 }; 109 110 struct st_quirk_inquiry_pattern st_quirk_patterns[] = { 111 {T_SEQUENTIAL, T_REMOV, 112 " ", " ", " ", 0, 0, { 113 ST_Q_FORCE_BLKSIZE, 512, 0, /* minor 0-3 */ 114 ST_Q_FORCE_BLKSIZE, 512, QIC_24, /* minor 4-7 */ 115 ST_Q_FORCE_BLKSIZE, 0, HALFINCH_1600, /* minor 8-11 */ 116 ST_Q_FORCE_BLKSIZE, 0, HALFINCH_6250 /* minor 12-15 */ 117 }}, 118 {T_SEQUENTIAL, T_REMOV, 119 "TANDBERG", " TDC 3600 ", "", 0, 12, { 120 0, 0, 0, /* minor 0-3 */ 121 ST_Q_FORCE_BLKSIZE, 0, QIC_525, /* minor 4-7 */ 122 0, 0, QIC_150, /* minor 8-11 */ 123 0, 0, QIC_120 /* minor 12-15 */ 124 }}, 125 {T_SEQUENTIAL, T_REMOV, 126 "TANDBERG", " TDC 3800 ", "", 0, 0, { 127 ST_Q_FORCE_BLKSIZE, 512, 0, /* minor 0-3 */ 128 0, 0, QIC_525, /* minor 4-7 */ 129 0, 0, QIC_150, /* minor 8-11 */ 130 0, 0, QIC_120 /* minor 12-15 */ 131 }}, 132 /* 133 * At least -005 and -007 need this. I'll assume they all do unless I 134 * hear otherwise. - mycroft, 31MAR1994 135 */ 136 {T_SEQUENTIAL, T_REMOV, 137 "ARCHIVE ", "VIPER 2525 25462", "", 0, 0, { 138 ST_Q_SENSE_HELP, 0, 0, /* minor 0-3 */ 139 ST_Q_SENSE_HELP, 0, QIC_525, /* minor 4-7 */ 140 0, 0, QIC_150, /* minor 8-11 */ 141 0, 0, QIC_120 /* minor 12-15 */ 142 }}, 143 /* 144 * One user reports that this works for his tape drive. It probably 145 * needs more work. - mycroft, 09APR1994 146 */ 147 {T_SEQUENTIAL, T_REMOV, 148 "SANKYO ", "CP525 ", "", 0, 0, { 149 ST_Q_FORCE_BLKSIZE, 512, 0, /* minor 0-3 */ 150 ST_Q_FORCE_BLKSIZE, 512, QIC_525, /* minor 4-7 */ 151 0, 0, QIC_150, /* minor 8-11 */ 152 0, 0, QIC_120 /* minor 12-15 */ 153 }}, 154 {T_SEQUENTIAL, T_REMOV, 155 "ANRITSU ", "DMT780 ", "", 0, 0, { 156 ST_Q_FORCE_BLKSIZE, 512, 0, /* minor 0-3 */ 157 ST_Q_FORCE_BLKSIZE, 512, QIC_525, /* minor 4-7 */ 158 0, 0, QIC_150, /* minor 8-11 */ 159 0, 0, QIC_120 /* minor 12-15 */ 160 }}, 161 {T_SEQUENTIAL, T_REMOV, 162 "ARCHIVE ", "VIPER 150 21247", "", 0, 12, { 163 0, 0, 0, /* minor 0-3 */ 164 0, 0, QIC_150, /* minor 4-7 */ 165 0, 0, QIC_120, /* minor 8-11 */ 166 0, 0, QIC_24 /* minor 12-15 */ 167 }}, 168 {T_SEQUENTIAL, T_REMOV, 169 "WANGTEK ", "5099ES SCSI", "", 0, 0, { 170 ST_Q_FORCE_BLKSIZE, 512, 0, /* minor 0-3 */ 171 0, 0, QIC_11, /* minor 4-7 */ 172 0, 0, QIC_24, /* minor 8-11 */ 173 0, 0, QIC_24, /* minor 12-15 */ 174 }}, 175 {T_SEQUENTIAL, T_REMOV, 176 "WANGTEK ", "5150ES SCSI", "", 0, 0, { 177 ST_Q_FORCE_BLKSIZE, 512, 0, /* minor 0-3 */ 178 0, 0, QIC_24, /* minor 4-7 */ 179 0, 0, QIC_120, /* minor 8-11 */ 180 0, 0, QIC_150 /* minor 12-15 */ 181 }}, 182 {T_SEQUENTIAL, T_REMOV, 183 "WANGTEK ", "5525ES SCSI REV7", "", 0, 0, { 184 0, 0, 0, /* minor 0-3 */ 185 ST_Q_BLKSIZE, 0, QIC_525, /* minor 4-7 */ 186 0, 0, QIC_150, /* minor 8-11 */ 187 0, 0, QIC_120 /* minor 12-15 */ 188 }}, 189 {T_SEQUENTIAL, T_REMOV, 190 "WangDAT ", "Model 1300 ", "", 0, 0, { 191 0, 0, 0, /* minor 0-3 */ 192 ST_Q_FORCE_BLKSIZE, 512, DDS, /* minor 4-7 */ 193 ST_Q_FORCE_BLKSIZE, 1024, DDS, /* minor 8-11 */ 194 ST_Q_FORCE_BLKSIZE, 0, DDS /* minor 12-15 */ 195 }}, 196 {T_SEQUENTIAL, T_REMOV, 197 "EXABYTE ", "EXB-8200 ", "263H", 0, 5, { 198 0, 0, 0, /* minor 0-3 */ 199 0, 0, 0, /* minor 4-7 */ 200 0, 0, 0, /* minor 8-11 */ 201 0, 0, 0 /* minor 12-15 */ 202 }}, 203 #if 0 204 {T_SEQUENTIAL, T_REMOV, 205 "EXABYTE ", "EXB-8200 ", "", 0, 12, { 206 0, 0, 0, /* minor 0-3 */ 207 0, 0, 0, /* minor 4-7 */ 208 0, 0, 0, /* minor 8-11 */ 209 0, 0, 0 /* minor 12-15 */ 210 }}, 211 #endif 212 }; 213 214 #define NOEJECT 0 215 #define EJECT 1 216 217 struct st_softc { 218 struct device sc_dev; 219 /*--------------------present operating parameters, flags etc.----------------*/ 220 int flags; /* see below */ 221 u_int quirks; /* quirks for the open mode */ 222 int blksize; /* blksize we are using */ 223 u_int8_t density; /* present density */ 224 u_int page_0_size; /* size of page 0 data */ 225 u_int last_dsty; /* last density opened */ 226 /*--------------------device/scsi parameters----------------------------------*/ 227 struct scsi_link *sc_link; /* our link to the adpter etc. */ 228 /*--------------------parameters reported by the device ----------------------*/ 229 int blkmin; /* min blk size */ 230 int blkmax; /* max blk size */ 231 struct quirkdata *quirkdata; /* if we have a rogue entry */ 232 /*--------------------parameters reported by the device for this media--------*/ 233 u_long numblks; /* nominal blocks capacity */ 234 int media_blksize; /* 0 if not ST_FIXEDBLOCKS */ 235 u_int8_t media_density; /* this is what it said when asked */ 236 /*--------------------quirks for the whole drive------------------------------*/ 237 u_int drive_quirks; /* quirks of this drive */ 238 /*--------------------How we should set up when opening each minor device----*/ 239 struct modes modes[4]; /* plus more for each mode */ 240 u_int8_t modeflags[4]; /* flags for the modes */ 241 #define DENSITY_SET_BY_USER 0x01 242 #define DENSITY_SET_BY_QUIRK 0x02 243 #define BLKSIZE_SET_BY_USER 0x04 244 #define BLKSIZE_SET_BY_QUIRK 0x08 245 /*--------------------storage for sense data returned by the drive------------*/ 246 u_char sense_data[MAX_PAGE_0_SIZE]; /* 247 * additional sense data needed 248 * for mode sense/select. 249 */ 250 struct buf buf_queue; /* the queue of pending IO operations */ 251 }; 252 253 int stmatch __P((struct device *, void *, void *)); 254 void stattach __P((struct device *, struct device *, void *)); 255 256 struct cfdriver stcd = { 257 NULL, "st", stmatch, stattach, DV_TAPE, sizeof(struct st_softc) 258 }; 259 260 int st_space __P((struct st_softc *, int number, u_int what, int flags)); 261 int st_rewind __P((struct st_softc *, u_int immediate, int flags)); 262 int st_mode_sense __P((struct st_softc *, int flags)); 263 int st_decide_mode __P((struct st_softc *, boolean first_read)); 264 int st_read_block_limits __P((struct st_softc *, int flags)); 265 int st_touch_tape __P((struct st_softc *)); 266 int st_write_filemarks __P((struct st_softc *, int number, int flags)); 267 int st_load __P((struct st_softc *, u_int type, int flags)); 268 int st_mode_select __P((struct st_softc *, int flags)); 269 void ststrategy(); 270 int st_check_eod(); 271 void ststart(); 272 void st_unmount(); 273 int st_mount_tape(); 274 void st_loadquirks(); 275 void st_identify_drive(); 276 int st_interpret_sense(); 277 278 struct scsi_device st_switch = { 279 st_interpret_sense, 280 ststart, 281 NULL, 282 NULL, 283 }; 284 285 #define ST_INFO_VALID 0x0001 286 #define ST_BLOCK_SET 0x0002 /* block size, mode set by ioctl */ 287 #define ST_WRITTEN 0x0004 /* data have been written, EOD needed */ 288 #define ST_FIXEDBLOCKS 0x0008 289 #define ST_AT_FILEMARK 0x0010 290 #define ST_EIO_PENDING 0x0020 /* we couldn't report it then (had data) */ 291 #define ST_NEW_MOUNT 0x0040 /* still need to decide mode */ 292 #define ST_READONLY 0x0080 /* st_mode_sense says write protected */ 293 #define ST_FM_WRITTEN 0x0100 /* 294 * EOF file mark written -- used with 295 * ~ST_WRITTEN to indicate that multiple file 296 * marks have been written 297 */ 298 #define ST_BLANK_READ 0x0200 /* BLANK CHECK encountered already */ 299 #define ST_2FM_AT_EOD 0x0400 /* write 2 file marks at EOD */ 300 #define ST_MOUNTED 0x0800 /* Device is presently mounted */ 301 302 #define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ) 303 #define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \ 304 ST_FIXEDBLOCKS | ST_READONLY | ST_FM_WRITTEN | \ 305 ST_2FM_AT_EOD | ST_PER_ACTION) 306 307 struct scsi_inquiry_pattern st_patterns[] = { 308 {T_SEQUENTIAL, T_REMOV, 309 "", "", ""}, 310 }; 311 312 int 313 stmatch(parent, match, aux) 314 struct device *parent; 315 void *match, *aux; 316 { 317 struct cfdata *cf = match; 318 struct scsibus_attach_args *sa = aux; 319 int priority; 320 321 (void)scsi_inqmatch(sa->sa_inqbuf, 322 (caddr_t)st_patterns, sizeof(st_patterns)/sizeof(st_patterns[0]), 323 sizeof(st_patterns[0]), &priority); 324 return (priority); 325 } 326 327 /* 328 * The routine called by the low level scsi routine when it discovers 329 * A device suitable for this driver 330 */ 331 void 332 stattach(parent, self, aux) 333 struct device *parent, *self; 334 void *aux; 335 { 336 struct st_softc *st = (void *)self; 337 struct scsibus_attach_args *sa = aux; 338 struct scsi_link *sc_link = sa->sa_sc_link; 339 340 SC_DEBUG(sc_link, SDEV_DB2, ("stattach: ")); 341 342 /* 343 * Store information needed to contact our base driver 344 */ 345 st->sc_link = sc_link; 346 sc_link->device = &st_switch; 347 sc_link->device_softc = st; 348 sc_link->openings = 1; 349 350 /* 351 * Check if the drive is a known criminal and take 352 * Any steps needed to bring it into line 353 */ 354 st_identify_drive(st, sa->sa_inqbuf); 355 356 /* 357 * Use the subdriver to request information regarding 358 * the drive. We cannot use interrupts yet, so the 359 * request must specify this. 360 */ 361 printf(": %s", st->quirkdata ? "rogue, " : ""); 362 if (scsi_test_unit_ready(sc_link, 363 SCSI_AUTOCONF | SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE) || 364 st_mode_sense(st, 365 SCSI_AUTOCONF | SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE)) 366 printf("drive empty\n"); 367 else { 368 printf("density code 0x%x, ", st->media_density); 369 if (st->media_blksize > 0) 370 printf("%d-byte", st->media_blksize); 371 else 372 printf("variable"); 373 printf(" blocks, write-%s\n", 374 (st->flags & ST_READONLY) ? "protected" : "enabled"); 375 } 376 377 /* 378 * Set up the buf queue for this device 379 */ 380 st->buf_queue.b_active = 0; 381 st->buf_queue.b_actf = 0; 382 st->buf_queue.b_actb = &st->buf_queue.b_actf; 383 } 384 385 /* 386 * Use the inquiry routine in 'scsi_base' to get drive info so we can 387 * Further tailor our behaviour. 388 */ 389 void 390 st_identify_drive(st, inqbuf) 391 struct st_softc *st; 392 struct scsi_inquiry_data *inqbuf; 393 { 394 struct st_quirk_inquiry_pattern *finger; 395 int priority; 396 397 finger = (struct st_quirk_inquiry_pattern *)scsi_inqmatch(inqbuf, 398 (caddr_t)st_quirk_patterns, 399 sizeof(st_quirk_patterns)/sizeof(st_quirk_patterns[0]), 400 sizeof(st_quirk_patterns[0]), &priority); 401 if (priority != 0) { 402 st->quirkdata = &finger->quirkdata; 403 st->drive_quirks = finger->quirkdata.quirks; 404 st->quirks = finger->quirkdata.quirks; /* start value */ 405 st->page_0_size = finger->quirkdata.page_0_size; 406 st_loadquirks(st); 407 } 408 } 409 410 /* 411 * initialise the subdevices to the default (QUIRK) state. 412 * this will remove any setting made by the system operator or previous 413 * operations. 414 */ 415 void 416 st_loadquirks(st) 417 struct st_softc *st; 418 { 419 int i; 420 struct modes *mode; 421 struct modes *mode2; 422 423 mode = st->quirkdata->modes; 424 mode2 = st->modes; 425 for (i = 0; i < 4; i++) { 426 bzero(mode2, sizeof(struct modes)); 427 st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK | 428 DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER | 429 DENSITY_SET_BY_USER); 430 if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_BLKSIZE) { 431 mode2->blksize = mode->blksize; 432 st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK; 433 } 434 if (mode->density) { 435 mode2->density = mode->density; 436 st->modeflags[i] |= DENSITY_SET_BY_QUIRK; 437 } 438 mode++; 439 mode2++; 440 } 441 } 442 443 /* 444 * open the device. 445 */ 446 int 447 stopen(dev, flags) 448 dev_t dev; 449 int flags; 450 { 451 int unit; 452 u_int mode, dsty; 453 int error = 0; 454 struct st_softc *st; 455 struct scsi_link *sc_link; 456 457 unit = STUNIT(dev); 458 if (unit >= stcd.cd_ndevs) 459 return ENXIO; 460 st = stcd.cd_devs[unit]; 461 if (!st) 462 return ENXIO; 463 464 mode = STMODE(dev); 465 dsty = STDSTY(dev); 466 sc_link = st->sc_link; 467 468 SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev, 469 unit, stcd.cd_ndevs)); 470 471 /* 472 * Only allow one at a time 473 */ 474 if (sc_link->flags & SDEV_OPEN) { 475 printf("%s: already open\n", st->sc_dev.dv_xname); 476 return EBUSY; 477 } 478 479 /* 480 * Catch any unit attention errors. 481 */ 482 if (error = scsi_test_unit_ready(sc_link, 483 SCSI_IGNORE_MEDIA_CHANGE | (mode == CTLMODE ? SCSI_IGNORE_NOT_READY : 0))) 484 goto bad; 485 486 sc_link->flags |= SDEV_OPEN; /* unit attn are now errors */ 487 488 /* 489 * If the mode is 3 (e.g. minor = 3,7,11,15) 490 * then the device has been opened to set defaults 491 * This mode does NOT ALLOW I/O, only ioctls 492 */ 493 if (mode == CTLMODE) 494 return 0; 495 496 /* 497 * if it's a different mode, or if the media has been 498 * invalidated, unmount the tape from the previous 499 * session but continue with open processing 500 */ 501 if (st->last_dsty != dsty || !(sc_link->flags & SDEV_MEDIA_LOADED)) 502 st_unmount(st, NOEJECT); 503 504 /* 505 * If we are not mounted, then we should start a new 506 * mount session. 507 */ 508 if (!(st->flags & ST_MOUNTED)) { 509 st_mount_tape(dev, flags); 510 st->last_dsty = dsty; 511 } 512 513 /* 514 * Make sure that a tape opened in write-only mode will have 515 * file marks written on it when closed, even if not written to. 516 * This is for SUN compatibility 517 */ 518 if ((flags & O_ACCMODE) == FWRITE) 519 st->flags |= ST_WRITTEN; 520 521 SC_DEBUG(sc_link, SDEV_DB2, ("open complete\n")); 522 return 0; 523 524 bad: 525 st_unmount(st, NOEJECT); 526 sc_link->flags &= ~SDEV_OPEN; 527 return error; 528 } 529 530 /* 531 * close the device.. only called if we are the LAST 532 * occurence of an open device 533 */ 534 int 535 stclose(dev) 536 dev_t dev; 537 { 538 struct st_softc *st = stcd.cd_devs[STUNIT(dev)]; 539 540 SC_DEBUG(st->sc_link, SDEV_DB1, ("closing\n")); 541 if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) 542 st_write_filemarks(st, 1, 0); 543 switch (STMODE(dev)) { 544 case 0: 545 case 3: /* for now */ 546 st_unmount(st, NOEJECT); 547 break; 548 case 1: 549 /* leave mounted unless media seems to have been removed */ 550 if (!(st->sc_link->flags & SDEV_MEDIA_LOADED)) 551 st_unmount(st, NOEJECT); 552 break; 553 case 2: 554 st_unmount(st, EJECT); 555 break; 556 } 557 st->sc_link->flags &= ~SDEV_OPEN; 558 559 return 0; 560 } 561 562 /* 563 * Start a new mount session. 564 * Copy in all the default parameters from the selected device mode. 565 * and try guess any that seem to be defaulted. 566 */ 567 int 568 st_mount_tape(dev, flags) 569 dev_t dev; 570 int flags; 571 { 572 int unit; 573 u_int mode, dsty; 574 struct st_softc *st; 575 struct scsi_link *sc_link; 576 int error = 0; 577 578 unit = STUNIT(dev); 579 mode = STMODE(dev); 580 dsty = STDSTY(dev); 581 st = stcd.cd_devs[unit]; 582 sc_link = st->sc_link; 583 584 if (st->flags & ST_MOUNTED) 585 return 0; 586 587 SC_DEBUG(sc_link, SDEV_DB1, ("mounting\n ")); 588 st->flags |= ST_NEW_MOUNT; 589 st->quirks = st->drive_quirks | st->modes[dsty].quirks; 590 /* 591 * If the media is new, then make sure we give it a chance to 592 * to do a 'load' instruction. (We assume it is new.) 593 */ 594 if (error = st_load(st, LD_LOAD, 0)) 595 return error; 596 /* 597 * Throw another dummy instruction to catch 598 * 'Unit attention' errors. Some drives appear to give 599 * these after doing a Load instruction. 600 * (noteably some DAT drives) 601 */ 602 scsi_test_unit_ready(sc_link, SCSI_SILENT); /* XXX */ 603 604 /* 605 * Some devices can't tell you much until they have been 606 * asked to look at the media. This quirk does this. 607 */ 608 if (st->quirks & ST_Q_SENSE_HELP) 609 if (error = st_touch_tape(st)) 610 return error; 611 /* 612 * Load the physical device parameters 613 * loads: blkmin, blkmax 614 */ 615 if (error = st_read_block_limits(st, 0)) 616 return error; 617 /* 618 * Load the media dependent parameters 619 * includes: media_blksize,media_density,numblks 620 * As we have a tape in, it should be reflected here. 621 * If not you may need the "quirk" above. 622 */ 623 if (error = st_mode_sense(st, 0)) 624 return error; 625 /* 626 * If we have gained a permanent density from somewhere, 627 * then use it in preference to the one supplied by 628 * default by the driver. 629 */ 630 if (st->modeflags[dsty] & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER)) 631 st->density = st->modes[dsty].density; 632 else 633 st->density = st->media_density; 634 /* 635 * If we have gained a permanent blocksize 636 * then use it in preference to the one supplied by 637 * default by the driver. 638 */ 639 st->flags &= ~ST_FIXEDBLOCKS; 640 if (st->modeflags[dsty] & (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) { 641 st->blksize = st->modes[dsty].blksize; 642 if (st->blksize) 643 st->flags |= ST_FIXEDBLOCKS; 644 } else { 645 if (error = st_decide_mode(st, FALSE)) 646 return error; 647 } 648 if (error = st_mode_select(st, 0)) { 649 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 650 return error; 651 } 652 scsi_prevent(sc_link, PR_PREVENT, 653 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 654 st->flags &= ~ST_NEW_MOUNT; 655 st->flags |= ST_MOUNTED; 656 sc_link->flags |= SDEV_MEDIA_LOADED; /* move earlier? */ 657 658 return 0; 659 } 660 661 /* 662 * End the present mount session. 663 * Rewind, and optionally eject the tape. 664 * Reset various flags to indicate that all new 665 * operations require another mount operation 666 */ 667 void 668 st_unmount(st, eject) 669 struct st_softc *st; 670 boolean eject; 671 { 672 struct scsi_link *sc_link = st->sc_link; 673 int nmarks; 674 675 if (!(st->flags & ST_MOUNTED)) 676 return; 677 SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n")); 678 st_check_eod(st, FALSE, &nmarks, SCSI_IGNORE_NOT_READY); 679 st_rewind(st, 0, SCSI_IGNORE_NOT_READY); 680 scsi_prevent(sc_link, PR_ALLOW, 681 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 682 if (eject) 683 st_load(st, LD_UNLOAD, SCSI_IGNORE_NOT_READY); 684 st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT); 685 sc_link->flags &= ~SDEV_MEDIA_LOADED; 686 } 687 688 /* 689 * Given all we know about the device, media, mode, 'quirks' and 690 * initial operation, make a decision as to how we should be set 691 * to run (regarding blocking and EOD marks) 692 */ 693 int 694 st_decide_mode(st, first_read) 695 struct st_softc *st; 696 boolean first_read; 697 { 698 #ifdef SCSIDEBUG 699 struct scsi_link *sc_link = st->sc_link; 700 #endif 701 702 SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n")); 703 704 /* 705 * If the drive can only handle fixed-length blocks and only at 706 * one size, perhaps we should just do that. 707 */ 708 if (st->blkmin && (st->blkmin == st->blkmax)) { 709 st->flags |= ST_FIXEDBLOCKS; 710 st->blksize = st->blkmin; 711 SC_DEBUG(sc_link, SDEV_DB3, 712 ("blkmin == blkmax of %d\n", st->blkmin)); 713 goto done; 714 } 715 /* 716 * If the tape density mandates (or even suggests) use of fixed 717 * or variable-length blocks, comply. 718 */ 719 switch (st->density) { 720 case HALFINCH_800: 721 case HALFINCH_1600: 722 case HALFINCH_6250: 723 case DDS: 724 st->flags &= ~ST_FIXEDBLOCKS; 725 st->blksize = 0; 726 SC_DEBUG(sc_link, SDEV_DB3, ("density specified variable\n")); 727 goto done; 728 case QIC_11: 729 case QIC_24: 730 case QIC_120: 731 case QIC_150: 732 case QIC_525: 733 case QIC_1320: 734 st->flags |= ST_FIXEDBLOCKS; 735 if (st->media_blksize > 0) 736 st->blksize = st->media_blksize; 737 else 738 st->blksize = DEF_FIXED_BSIZE; 739 SC_DEBUG(sc_link, SDEV_DB3, ("density specified fixed\n")); 740 goto done; 741 } 742 /* 743 * If we're about to read the tape, perhaps we should choose 744 * fixed or variable-length blocks and block size according to 745 * what the drive found on the tape. 746 */ 747 if (first_read && 748 (!(st->quirks & ST_Q_BLKSIZE) || (st->media_blksize == 0) || 749 (st->media_blksize == DEF_FIXED_BSIZE) || 750 (st->media_blksize == 1024))) { 751 if (st->media_blksize > 0) 752 st->flags |= ST_FIXEDBLOCKS; 753 else 754 st->flags &= ~ST_FIXEDBLOCKS; 755 st->blksize = st->media_blksize; 756 SC_DEBUG(sc_link, SDEV_DB3, 757 ("Used media_blksize of %d\n", st->media_blksize)); 758 goto done; 759 } 760 /* 761 * We're getting no hints from any direction. Choose variable- 762 * length blocks arbitrarily. 763 */ 764 st->flags &= ~ST_FIXEDBLOCKS; 765 st->blksize = 0; 766 SC_DEBUG(sc_link, SDEV_DB3, 767 ("Give up and default to variable mode\n")); 768 769 done: 770 /* 771 * Decide whether or not to write two file marks to signify end- 772 * of-data. Make the decision as a function of density. If 773 * the decision is not to use a second file mark, the SCSI BLANK 774 * CHECK condition code will be recognized as end-of-data when 775 * first read. 776 * (I think this should be a by-product of fixed/variable..julian) 777 */ 778 switch (st->density) { 779 /* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ 780 case QIC_11: 781 case QIC_24: 782 case QIC_120: 783 case QIC_150: 784 case QIC_525: 785 case QIC_1320: 786 st->flags &= ~ST_2FM_AT_EOD; 787 break; 788 default: 789 st->flags |= ST_2FM_AT_EOD; 790 } 791 return 0; 792 } 793 794 /* 795 * Actually translate the requested transfer into 796 * one the physical driver can understand 797 * The transfer is described by a buf and will include 798 * only one physical transfer. 799 */ 800 void 801 ststrategy(bp) 802 struct buf *bp; 803 { 804 struct st_softc *st = stcd.cd_devs[STUNIT(bp->b_dev)]; 805 struct buf *dp; 806 int s; 807 808 SC_DEBUG(st->sc_link, SDEV_DB1, 809 ("ststrategy %d bytes @ blk %d\n", bp->b_bcount, bp->b_blkno)); 810 /* 811 * If it's a null transfer, return immediatly 812 */ 813 if (bp->b_bcount == 0) 814 goto done; 815 /* 816 * Odd sized request on fixed drives are verboten 817 */ 818 if (st->flags & ST_FIXEDBLOCKS) { 819 if (bp->b_bcount % st->blksize) { 820 printf("%s: bad request, must be multiple of %d\n", 821 st->sc_dev.dv_xname, st->blksize); 822 bp->b_error = EIO; 823 goto bad; 824 } 825 } 826 /* 827 * as are out-of-range requests on variable drives. 828 */ 829 else if (bp->b_bcount < st->blkmin || 830 (st->blkmax && bp->b_bcount > st->blkmax)) { 831 printf("%s: bad request, must be between %d and %d\n", 832 st->sc_dev.dv_xname, st->blkmin, st->blkmax); 833 bp->b_error = EIO; 834 goto bad; 835 } 836 s = splbio(); 837 838 /* 839 * Place it in the queue of activities for this tape 840 * at the end (a bit silly because we only have on user.. 841 * (but it could fork())) 842 */ 843 dp = &st->buf_queue; 844 bp->b_actf = NULL; 845 bp->b_actb = dp->b_actb; 846 *dp->b_actb = bp; 847 dp->b_actb = &bp->b_actf; 848 849 /* 850 * Tell the device to get going on the transfer if it's 851 * not doing anything, otherwise just wait for completion 852 * (All a bit silly if we're only allowing 1 open but..) 853 */ 854 ststart(st); 855 856 splx(s); 857 return; 858 bad: 859 bp->b_flags |= B_ERROR; 860 done: 861 /* 862 * Correctly set the buf to indicate a completed xfer 863 */ 864 iodone(bp); 865 return; 866 } 867 868 /* 869 * ststart looks to see if there is a buf waiting for the device 870 * and that the device is not already busy. If both are true, 871 * It dequeues the buf and creates a scsi command to perform the 872 * transfer required. The transfer request will call scsi_done 873 * on completion, which will in turn call this routine again 874 * so that the next queued transfer is performed. 875 * The bufs are queued by the strategy routine (ststrategy) 876 * 877 * This routine is also called after other non-queued requests 878 * have been made of the scsi driver, to ensure that the queue 879 * continues to be drained. 880 * ststart() is called at splbio 881 */ 882 void 883 ststart(st) 884 struct st_softc *st; 885 { 886 struct scsi_link *sc_link = st->sc_link; 887 register struct buf *bp, *dp; 888 struct scsi_rw_tape cmd; 889 int flags; 890 891 SC_DEBUG(sc_link, SDEV_DB2, ("ststart ")); 892 /* 893 * See if there is a buf to do and we are not already 894 * doing one 895 */ 896 while (sc_link->openings > 0) { 897 /* if a special awaits, let it proceed first */ 898 if (sc_link->flags & SDEV_WAITING) { 899 sc_link->flags &= ~SDEV_WAITING; 900 wakeup((caddr_t)sc_link); 901 return; 902 } 903 904 bp = st->buf_queue.b_actf; 905 if (!bp) 906 return; /* no work to bother with */ 907 if (dp = bp->b_actf) 908 dp->b_actb = bp->b_actb; 909 else 910 st->buf_queue.b_actb = bp->b_actb; 911 *bp->b_actb = dp; 912 913 /* 914 * if the device has been unmounted byt the user 915 * then throw away all requests until done 916 */ 917 if (!(st->flags & ST_MOUNTED) || 918 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 919 /* make sure that one implies the other.. */ 920 sc_link->flags &= ~SDEV_MEDIA_LOADED; 921 bp->b_flags |= B_ERROR; 922 bp->b_error = EIO; 923 biodone(bp); 924 continue; 925 } 926 /* 927 * only FIXEDBLOCK devices have pending operations 928 */ 929 if (st->flags & ST_FIXEDBLOCKS) { 930 /* 931 * If we are at a filemark but have not reported it yet 932 * then we should report it now 933 */ 934 if (st->flags & ST_AT_FILEMARK) { 935 if ((bp->b_flags & B_READ) == B_WRITE) { 936 /* 937 * Handling of ST_AT_FILEMARK in 938 * st_space will fill in the right file 939 * mark count. 940 * Back up over filemark 941 */ 942 if (st_space(st, 0, SP_FILEMARKS, 0)) { 943 bp->b_flags |= B_ERROR; 944 bp->b_error = EIO; 945 biodone(bp); 946 continue; 947 } 948 } else { 949 bp->b_resid = bp->b_bcount; 950 bp->b_error = 0; 951 bp->b_flags &= ~B_ERROR; 952 st->flags &= ~ST_AT_FILEMARK; 953 biodone(bp); 954 continue; /* seek more work */ 955 } 956 } 957 /* 958 * If we are at EIO (e.g. EOM) but have not reported it 959 * yet then we should report it now 960 */ 961 if (st->flags & ST_EIO_PENDING) { 962 bp->b_resid = bp->b_bcount; 963 bp->b_error = EIO; 964 bp->b_flags |= B_ERROR; 965 st->flags &= ~ST_EIO_PENDING; 966 biodone(bp); 967 continue; /* seek more work */ 968 } 969 } 970 971 /* 972 * Fill out the scsi command 973 */ 974 bzero(&cmd, sizeof(cmd)); 975 if ((bp->b_flags & B_READ) == B_WRITE) { 976 cmd.opcode = WRITE; 977 st->flags &= ~ST_FM_WRITTEN; 978 st->flags |= ST_WRITTEN; 979 flags = SCSI_DATA_OUT; 980 } else { 981 cmd.opcode = READ; 982 flags = SCSI_DATA_IN; 983 } 984 985 /* 986 * Handle "fixed-block-mode" tape drives by using the 987 * block count instead of the length. 988 */ 989 if (st->flags & ST_FIXEDBLOCKS) { 990 cmd.byte2 |= SRW_FIXED; 991 lto3b(bp->b_bcount / st->blksize, cmd.len); 992 } else 993 lto3b(bp->b_bcount, cmd.len); 994 995 /* 996 * go ask the adapter to do all this for us 997 */ 998 if (scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 999 sizeof(cmd), (u_char *) bp->b_data, bp->b_bcount, 0, 1000 100000, bp, flags | SCSI_NOSLEEP)) 1001 printf("%s: not queued\n", st->sc_dev.dv_xname); 1002 } /* go back and see if we can cram more work in.. */ 1003 } 1004 1005 int 1006 stread(dev, uio) 1007 dev_t dev; 1008 struct uio *uio; 1009 { 1010 struct st_softc *st = stcd.cd_devs[STUNIT(dev)]; 1011 1012 return (physio(ststrategy, NULL, dev, B_READ, 1013 st->sc_link->adapter->scsi_minphys, uio)); 1014 } 1015 1016 int 1017 stwrite(dev, uio) 1018 dev_t dev; 1019 struct uio *uio; 1020 { 1021 struct st_softc *st = stcd.cd_devs[STUNIT(dev)]; 1022 1023 return (physio(ststrategy, NULL, dev, B_WRITE, 1024 st->sc_link->adapter->scsi_minphys, uio)); 1025 } 1026 1027 /* 1028 * Perform special action on behalf of the user; 1029 * knows about the internals of this device 1030 */ 1031 int 1032 stioctl(dev, cmd, arg, flag, p) 1033 dev_t dev; 1034 u_long cmd; 1035 caddr_t arg; 1036 int flag; 1037 struct proc *p; 1038 { 1039 int error = 0; 1040 int unit; 1041 int number, nmarks, dsty; 1042 int flags; 1043 struct st_softc *st; 1044 int hold_blksize; 1045 u_int8_t hold_density; 1046 struct mtop *mt = (struct mtop *) arg; 1047 1048 /* 1049 * Find the device that the user is talking about 1050 */ 1051 flags = 0; /* give error messages, act on errors etc. */ 1052 unit = STUNIT(dev); 1053 dsty = STDSTY(dev); 1054 st = stcd.cd_devs[unit]; 1055 hold_blksize = st->blksize; 1056 hold_density = st->density; 1057 1058 switch (cmd) { 1059 1060 case MTIOCGET: { 1061 struct mtget *g = (struct mtget *) arg; 1062 1063 SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: get status]\n")); 1064 bzero(g, sizeof(struct mtget)); 1065 g->mt_type = 0x7; /* Ultrix compat *//*? */ 1066 g->mt_blksiz = st->blksize; 1067 g->mt_density = st->density; 1068 g->mt_mblksiz[0] = st->modes[0].blksize; 1069 g->mt_mblksiz[1] = st->modes[1].blksize; 1070 g->mt_mblksiz[2] = st->modes[2].blksize; 1071 g->mt_mblksiz[3] = st->modes[3].blksize; 1072 g->mt_mdensity[0] = st->modes[0].density; 1073 g->mt_mdensity[1] = st->modes[1].density; 1074 g->mt_mdensity[2] = st->modes[2].density; 1075 g->mt_mdensity[3] = st->modes[3].density; 1076 break; 1077 } 1078 case MTIOCTOP: { 1079 1080 SC_DEBUG(st->sc_link, SDEV_DB1, 1081 ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, mt->mt_count)); 1082 1083 /* compat: in U*x it is a short */ 1084 number = mt->mt_count; 1085 switch ((short) (mt->mt_op)) { 1086 case MTWEOF: /* write an end-of-file record */ 1087 error = st_write_filemarks(st, number, flags); 1088 break; 1089 case MTBSF: /* backward space file */ 1090 number = -number; 1091 case MTFSF: /* forward space file */ 1092 error = st_check_eod(st, FALSE, &nmarks, flags); 1093 if (!error) 1094 error = st_space(st, number - nmarks, 1095 SP_FILEMARKS, flags); 1096 break; 1097 case MTBSR: /* backward space record */ 1098 number = -number; 1099 case MTFSR: /* forward space record */ 1100 error = st_check_eod(st, TRUE, &nmarks, flags); 1101 if (!error) 1102 error = st_space(st, number, SP_BLKS, flags); 1103 break; 1104 case MTREW: /* rewind */ 1105 error = st_rewind(st, 0, flags); 1106 break; 1107 case MTOFFL: /* rewind and put the drive offline */ 1108 st_unmount(st, EJECT); 1109 break; 1110 case MTNOP: /* no operation, sets status only */ 1111 break; 1112 case MTRETEN: /* retension the tape */ 1113 error = st_load(st, LD_RETENSION, flags); 1114 if (!error) 1115 error = st_load(st, LD_LOAD, flags); 1116 break; 1117 case MTEOM: /* forward space to end of media */ 1118 error = st_check_eod(st, FALSE, &nmarks, flags); 1119 if (!error) 1120 error = st_space(st, 1, SP_EOM, flags); 1121 break; 1122 case MTCACHE: /* enable controller cache */ 1123 case MTNOCACHE: /* disable controller cache */ 1124 break; 1125 case MTSETBSIZ: /* Set block size for device */ 1126 #ifdef NOTYET 1127 if (!(st->flags & ST_NEW_MOUNT)) { 1128 uprintf("re-mount tape before changing blocksize"); 1129 error = EINVAL; 1130 break; 1131 } 1132 #endif 1133 if (number == 0) { 1134 st->flags &= ~ST_FIXEDBLOCKS; 1135 } else { 1136 if ((st->blkmin || st->blkmax) && 1137 (number < st->blkmin || 1138 number > st->blkmax)) { 1139 error = EINVAL; 1140 break; 1141 } 1142 st->flags |= ST_FIXEDBLOCKS; 1143 } 1144 st->blksize = number; 1145 st->flags |= ST_BLOCK_SET; /*XXX */ 1146 goto try_new_value; 1147 1148 case MTSETDNSTY: /* Set density for device and mode */ 1149 if (number > SCSI_2_MAX_DENSITY_CODE) 1150 error = EINVAL; 1151 else 1152 st->density = number; 1153 goto try_new_value; 1154 1155 default: 1156 error = EINVAL; 1157 } 1158 break; 1159 } 1160 case MTIOCIEOT: 1161 case MTIOCEEOT: 1162 break; 1163 default: 1164 if (STMODE(dev) == CTLMODE) 1165 error = scsi_do_ioctl(st->sc_link, dev, cmd, arg, flag, p); 1166 else 1167 error = ENOTTY; 1168 break; 1169 } 1170 return error; 1171 /*-----------------------------*/ 1172 try_new_value: 1173 /* 1174 * Check that the mode being asked for is aggreeable to the 1175 * drive. If not, put it back the way it was. 1176 */ 1177 if (error = st_mode_select(st, 0)) { /* put it back as it was */ 1178 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 1179 st->density = hold_density; 1180 st->blksize = hold_blksize; 1181 if (st->blksize) 1182 st->flags |= ST_FIXEDBLOCKS; 1183 else 1184 st->flags &= ~ST_FIXEDBLOCKS; 1185 return error; 1186 } 1187 /* 1188 * As the drive liked it, if we are setting a new default, 1189 * set it into the structures as such. 1190 * 1191 * The means for deciding this are not finalised yet 1192 */ 1193 if (STMODE(dev) == 0x03) { 1194 /* special mode */ 1195 /* XXX */ 1196 switch ((short) (mt->mt_op)) { 1197 case MTSETBSIZ: 1198 st->modes[dsty].blksize = st->blksize; 1199 st->modeflags[dsty] |= BLKSIZE_SET_BY_USER; 1200 break; 1201 case MTSETDNSTY: 1202 st->modes[dsty].density = st->density; 1203 st->modeflags[dsty] |= DENSITY_SET_BY_USER; 1204 break; 1205 } 1206 } 1207 return 0; 1208 } 1209 1210 /* 1211 * Do a synchronous read. 1212 */ 1213 int 1214 st_read(st, buf, size, flags) 1215 struct st_softc *st; 1216 int size; 1217 int flags; 1218 char *buf; 1219 { 1220 struct scsi_rw_tape cmd; 1221 1222 /* 1223 * If it's a null transfer, return immediatly 1224 */ 1225 if (size == 0) 1226 return 0; 1227 bzero(&cmd, sizeof(cmd)); 1228 cmd.opcode = READ; 1229 if (st->flags & ST_FIXEDBLOCKS) { 1230 cmd.byte2 |= SRW_FIXED; 1231 lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE), 1232 cmd.len); 1233 } else 1234 lto3b(size, cmd.len); 1235 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1236 sizeof(cmd), (u_char *) buf, size, 0, 100000, NULL, 1237 flags | SCSI_DATA_IN); 1238 } 1239 1240 #ifdef __STDC__ 1241 #define b2tol(a) (((unsigned)(a##_1) << 8) + (unsigned)a##_0) 1242 #else 1243 #define b2tol(a) (((unsigned)(a/**/_1) << 8) + (unsigned)a/**/_0) 1244 #endif 1245 1246 /* 1247 * Ask the drive what it's min and max blk sizes are. 1248 */ 1249 int 1250 st_read_block_limits(st, flags) 1251 struct st_softc *st; 1252 int flags; 1253 { 1254 struct scsi_block_limits cmd; 1255 struct scsi_block_limits_data block_limits; 1256 struct scsi_link *sc_link = st->sc_link; 1257 int error; 1258 1259 /* 1260 * First check if we have it all loaded 1261 */ 1262 if ((sc_link->flags & SDEV_MEDIA_LOADED)) 1263 return 0; 1264 1265 /* 1266 * do a 'Read Block Limits' 1267 */ 1268 bzero(&cmd, sizeof(cmd)); 1269 cmd.opcode = READ_BLOCK_LIMITS; 1270 1271 /* 1272 * do the command, update the global values 1273 */ 1274 if (error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1275 sizeof(cmd), (u_char *) &block_limits, sizeof(block_limits), 1276 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN)) 1277 return error; 1278 1279 st->blkmin = b2tol(block_limits.min_length); 1280 st->blkmax = _3btol(&block_limits.max_length_2); 1281 1282 SC_DEBUG(sc_link, SDEV_DB3, 1283 ("(%d <= blksize <= %d)\n", st->blkmin, st->blkmax)); 1284 return 0; 1285 } 1286 1287 /* 1288 * Get the scsi driver to send a full inquiry to the 1289 * device and use the results to fill out the global 1290 * parameter structure. 1291 * 1292 * called from: 1293 * attach 1294 * open 1295 * ioctl (to reset original blksize) 1296 */ 1297 int 1298 st_mode_sense(st, flags) 1299 struct st_softc *st; 1300 int flags; 1301 { 1302 u_int scsi_sense_len; 1303 int error; 1304 struct scsi_mode_sense cmd; 1305 struct scsi_sense { 1306 struct scsi_mode_header header; 1307 struct scsi_blk_desc blk_desc; 1308 u_char sense_data[MAX_PAGE_0_SIZE]; 1309 } scsi_sense; 1310 struct scsi_link *sc_link = st->sc_link; 1311 1312 scsi_sense_len = 12 + st->page_0_size; 1313 1314 /* 1315 * Set up a mode sense 1316 */ 1317 bzero(&cmd, sizeof(cmd)); 1318 cmd.opcode = MODE_SENSE; 1319 cmd.length = scsi_sense_len; 1320 1321 /* 1322 * do the command, but we don't need the results 1323 * just print them for our interest's sake, if asked, 1324 * or if we need it as a template for the mode select 1325 * store it away. 1326 */ 1327 if (error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1328 sizeof(cmd), (u_char *) &scsi_sense, scsi_sense_len, 1329 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN)) 1330 return error; 1331 1332 st->numblks = _3btol(scsi_sense.blk_desc.nblocks); 1333 st->media_blksize = _3btol(scsi_sense.blk_desc.blklen); 1334 st->media_density = scsi_sense.blk_desc.density; 1335 if (scsi_sense.header.dev_spec & SMH_DSP_WRITE_PROT) 1336 st->flags |= ST_READONLY; 1337 SC_DEBUG(sc_link, SDEV_DB3, 1338 ("density code 0x%x, %d-byte blocks, write-%s, ", 1339 st->media_density, st->media_blksize, 1340 st->flags & ST_READONLY ? "protected" : "enabled")); 1341 SC_DEBUG(sc_link, SDEV_DB3, 1342 ("%sbuffered\n", 1343 scsi_sense.header.dev_spec & SMH_DSP_BUFF_MODE ? "" : "un")); 1344 if (st->page_0_size) 1345 bcopy(scsi_sense.sense_data, st->sense_data, st->page_0_size); 1346 sc_link->flags |= SDEV_MEDIA_LOADED; 1347 return 0; 1348 } 1349 1350 /* 1351 * Send a filled out parameter structure to the drive to 1352 * set it into the desire modes etc. 1353 */ 1354 int 1355 st_mode_select(st, flags) 1356 struct st_softc *st; 1357 int flags; 1358 { 1359 u_int scsi_select_len; 1360 int error; 1361 struct scsi_mode_select cmd; 1362 struct scsi_select { 1363 struct scsi_mode_header header; 1364 struct scsi_blk_desc blk_desc; 1365 u_char sense_data[MAX_PAGE_0_SIZE]; 1366 } scsi_select; 1367 struct scsi_link *sc_link = st->sc_link; 1368 1369 scsi_select_len = 12 + st->page_0_size; 1370 1371 /* 1372 * Set up for a mode select 1373 */ 1374 bzero(&cmd, sizeof(cmd)); 1375 cmd.opcode = MODE_SELECT; 1376 cmd.length = scsi_select_len; 1377 1378 bzero(&scsi_select, scsi_select_len); 1379 scsi_select.header.blk_desc_len = sizeof(struct scsi_blk_desc); 1380 scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_ON; 1381 scsi_select.blk_desc.density = st->density; 1382 if (st->flags & ST_FIXEDBLOCKS) 1383 lto3b(st->blksize, scsi_select.blk_desc.blklen); 1384 if (st->page_0_size) 1385 bcopy(st->sense_data, scsi_select.sense_data, st->page_0_size); 1386 1387 /* 1388 * do the command 1389 */ 1390 return scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1391 sizeof(cmd), (u_char *) &scsi_select, scsi_select_len, 1392 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_OUT); 1393 } 1394 1395 /* 1396 * skip N blocks/filemarks/seq filemarks/eom 1397 */ 1398 int 1399 st_space(st, number, what, flags) 1400 struct st_softc *st; 1401 u_int what; 1402 int flags; 1403 int number; 1404 { 1405 struct scsi_space cmd; 1406 int error; 1407 1408 switch (what) { 1409 case SP_BLKS: 1410 if (st->flags & ST_PER_ACTION) { 1411 if (number > 0) { 1412 st->flags &= ~ST_PER_ACTION; 1413 return EIO; 1414 } else if (number < 0) { 1415 if (st->flags & ST_AT_FILEMARK) { 1416 /* 1417 * Handling of ST_AT_FILEMARK 1418 * in st_space will fill in the 1419 * right file mark count. 1420 */ 1421 error = st_space(st, 0, SP_FILEMARKS, 1422 flags); 1423 if (error) 1424 return error; 1425 } 1426 if (st->flags & ST_BLANK_READ) { 1427 st->flags &= ~ST_BLANK_READ; 1428 return EIO; 1429 } 1430 st->flags &= ~ST_EIO_PENDING; 1431 } 1432 } 1433 break; 1434 case SP_FILEMARKS: 1435 if (st->flags & ST_EIO_PENDING) { 1436 if (number > 0) { 1437 /* pretend we just discovered the error */ 1438 st->flags &= ~ST_EIO_PENDING; 1439 return EIO; 1440 } else if (number < 0) { 1441 /* back away from the error */ 1442 st->flags &= ~ST_EIO_PENDING; 1443 } 1444 } 1445 if (st->flags & ST_AT_FILEMARK) { 1446 st->flags &= ~ST_AT_FILEMARK; 1447 number--; 1448 } 1449 if ((st->flags & ST_BLANK_READ) && (number < 0)) { 1450 /* back away from unwritten tape */ 1451 st->flags &= ~ST_BLANK_READ; 1452 number++; /* XXX dubious */ 1453 } 1454 break; 1455 case SP_EOM: 1456 if (st->flags & ST_EIO_PENDING) { 1457 /* pretend we just discovered the error */ 1458 st->flags &= ~ST_EIO_PENDING; 1459 return EIO; 1460 } 1461 if (st->flags & ST_AT_FILEMARK) 1462 st->flags &= ~ST_AT_FILEMARK; 1463 break; 1464 } 1465 if (number == 0) 1466 return 0; 1467 1468 bzero(&cmd, sizeof(cmd)); 1469 cmd.opcode = SPACE; 1470 cmd.byte2 = what; 1471 lto3b(number, cmd.number); 1472 1473 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1474 sizeof(cmd), 0, 0, 0, 900000, NULL, flags); 1475 } 1476 1477 /* 1478 * write N filemarks 1479 */ 1480 int 1481 st_write_filemarks(st, number, flags) 1482 struct st_softc *st; 1483 int flags; 1484 int number; 1485 { 1486 struct scsi_write_filemarks cmd; 1487 1488 /* 1489 * It's hard to write a negative number of file marks. 1490 * Don't try. 1491 */ 1492 if (number < 0) 1493 return EINVAL; 1494 switch (number) { 1495 case 0: /* really a command to sync the drive's buffers */ 1496 break; 1497 case 1: 1498 if (st->flags & ST_FM_WRITTEN) /* already have one down */ 1499 st->flags &= ~ST_WRITTEN; 1500 else 1501 st->flags |= ST_FM_WRITTEN; 1502 st->flags &= ~ST_PER_ACTION; 1503 break; 1504 default: 1505 st->flags &= ~(ST_PER_ACTION | ST_WRITTEN); 1506 } 1507 1508 bzero(&cmd, sizeof(cmd)); 1509 cmd.opcode = WRITE_FILEMARKS; 1510 lto3b(number, cmd.number); 1511 1512 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1513 sizeof(cmd), 0, 0, 0, 100000, NULL, flags); 1514 } 1515 1516 /* 1517 * Make sure the right number of file marks is on tape if the 1518 * tape has been written. If the position argument is true, 1519 * leave the tape positioned where it was originally. 1520 * 1521 * nmarks returns the number of marks to skip (or, if position 1522 * true, which were skipped) to get back original position. 1523 */ 1524 int 1525 st_check_eod(st, position, nmarks, flags) 1526 struct st_softc *st; 1527 boolean position; 1528 int *nmarks; 1529 int flags; 1530 { 1531 int error; 1532 1533 switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) { 1534 default: 1535 *nmarks = 0; 1536 return 0; 1537 case ST_WRITTEN: 1538 case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD: 1539 *nmarks = 1; 1540 break; 1541 case ST_WRITTEN | ST_2FM_AT_EOD: 1542 *nmarks = 2; 1543 } 1544 error = st_write_filemarks(st, *nmarks, flags); 1545 if (position && !error) 1546 error = st_space(st, -*nmarks, SP_FILEMARKS, flags); 1547 return error; 1548 } 1549 1550 /* 1551 * load/unload/retension 1552 */ 1553 int 1554 st_load(st, type, flags) 1555 struct st_softc *st; 1556 u_int type; 1557 int flags; 1558 { 1559 struct scsi_load cmd; 1560 1561 if (type != LD_LOAD) { 1562 int error; 1563 int nmarks; 1564 1565 error = st_check_eod(st, FALSE, &nmarks, flags); 1566 if (error) 1567 return error; 1568 } 1569 if (st->quirks & ST_Q_IGNORE_LOADS) 1570 return 0; 1571 1572 bzero(&cmd, sizeof(cmd)); 1573 cmd.opcode = LOAD; 1574 cmd.how = type; 1575 1576 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1577 sizeof(cmd), 0, 0, ST_RETRIES, 300000, NULL, flags); 1578 } 1579 1580 /* 1581 * Rewind the device 1582 */ 1583 int 1584 st_rewind(st, immediate, flags) 1585 struct st_softc *st; 1586 u_int immediate; 1587 int flags; 1588 { 1589 struct scsi_rewind cmd; 1590 int error; 1591 int nmarks; 1592 1593 error = st_check_eod(st, FALSE, &nmarks, flags); 1594 if (error) 1595 return error; 1596 st->flags &= ~ST_PER_ACTION; 1597 1598 bzero(&cmd, sizeof(cmd)); 1599 cmd.opcode = REWIND; 1600 cmd.byte2 = immediate; 1601 1602 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1603 sizeof(cmd), 0, 0, ST_RETRIES, immediate ? 5000 : 300000, NULL, 1604 flags); 1605 } 1606 1607 /* 1608 * Look at the returned sense and act on the error and detirmine 1609 * The unix error number to pass back... (0 = report no error) 1610 * (-1 = continue processing) 1611 */ 1612 int 1613 st_interpret_sense(xs) 1614 struct scsi_xfer *xs; 1615 { 1616 struct scsi_link *sc_link = xs->sc_link; 1617 struct scsi_sense_data *sense = &xs->sense; 1618 struct buf *bp = xs->bp; 1619 struct st_softc *st = sc_link->device_softc; 1620 u_int8_t key; 1621 u_int32_t info; 1622 1623 /* 1624 * Get the sense fields and work out what code 1625 */ 1626 if (sense->error_code & SSD_ERRCODE_VALID) { 1627 bcopy(sense->extended_info, &info, sizeof info); 1628 info = ntohl(info); 1629 } else 1630 info = xs->datalen; /* bad choice if fixed blocks */ 1631 if ((sense->error_code & SSD_ERRCODE) != 0x70) 1632 return -1; /* let the generic code handle it */ 1633 if (st->flags & ST_FIXEDBLOCKS) { 1634 xs->resid = info * st->blksize; 1635 if (sense->extended_flags & SSD_EOM) { 1636 st->flags |= ST_EIO_PENDING; 1637 if (bp) 1638 bp->b_resid = xs->resid; 1639 } 1640 if (sense->extended_flags & SSD_FILEMARK) { 1641 st->flags |= ST_AT_FILEMARK; 1642 if (bp) 1643 bp->b_resid = xs->resid; 1644 } 1645 if (sense->extended_flags & SSD_ILI) { 1646 st->flags |= ST_EIO_PENDING; 1647 if (bp) 1648 bp->b_resid = xs->resid; 1649 if (sense->error_code & SSD_ERRCODE_VALID && 1650 (xs->flags & SCSI_SILENT) == 0) 1651 printf("%s: block wrong size, %d blocks residual\n", 1652 st->sc_dev.dv_xname, info); 1653 1654 /* 1655 * This quirk code helps the drive read 1656 * the first tape block, regardless of 1657 * format. That is required for these 1658 * drives to return proper MODE SENSE 1659 * information. 1660 */ 1661 if ((st->quirks & ST_Q_SENSE_HELP) && 1662 !(sc_link->flags & SDEV_MEDIA_LOADED)) 1663 st->blksize -= 512; 1664 } 1665 /* 1666 * If no data was tranfered, do it immediatly 1667 */ 1668 if (xs->resid >= xs->datalen) { 1669 if (st->flags & ST_EIO_PENDING) 1670 return EIO; 1671 if (st->flags & ST_AT_FILEMARK) { 1672 if (bp) 1673 bp->b_resid = xs->resid; 1674 return 0; 1675 } 1676 } 1677 } else { /* must be variable mode */ 1678 xs->resid = xs->datalen; /* to be sure */ 1679 if (sense->extended_flags & SSD_EOM) 1680 return EIO; 1681 if (sense->extended_flags & SSD_FILEMARK) { 1682 if (bp) 1683 bp->b_resid = bp->b_bcount; 1684 return 0; 1685 } 1686 if (sense->extended_flags & SSD_ILI) { 1687 if (info < 0) { 1688 /* 1689 * the record was bigger than the read 1690 */ 1691 if ((xs->flags & SCSI_SILENT) == 0) 1692 printf("%s: %d-byte record too big\n", 1693 st->sc_dev.dv_xname, 1694 xs->datalen - info); 1695 return EIO; 1696 } 1697 xs->resid = info; 1698 if (bp) 1699 bp->b_resid = info; 1700 } 1701 } 1702 key = sense->extended_flags & SSD_KEY; 1703 1704 if (key == 0x8) { 1705 /* 1706 * This quirk code helps the drive read the 1707 * first tape block, regardless of format. That 1708 * is required for these drives to return proper 1709 * MODE SENSE information. 1710 */ 1711 if ((st->quirks & ST_Q_SENSE_HELP) && 1712 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 1713 /* still starting */ 1714 st->blksize -= 512; 1715 } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) { 1716 st->flags |= ST_BLANK_READ; 1717 xs->resid = xs->datalen; 1718 if (bp) { 1719 bp->b_resid = xs->resid; 1720 /* return an EOF */ 1721 } 1722 return 0; 1723 } 1724 } 1725 return -1; /* let the default/generic handler handle it */ 1726 } 1727 1728 /* 1729 * The quirk here is that the drive returns some value to st_mode_sense 1730 * incorrectly until the tape has actually passed by the head. 1731 * 1732 * The method is to set the drive to large fixed-block state (user-specified 1733 * density and 1024-byte blocks), then read and rewind to get it to sense the 1734 * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't 1735 * work, as a last resort, try variable- length blocks. The result will be 1736 * the ability to do an accurate st_mode_sense. 1737 * 1738 * We know we can do a rewind because we just did a load, which implies rewind. 1739 * Rewind seems preferable to space backward if we have a virgin tape. 1740 * 1741 * The rest of the code for this quirk is in ILI processing and BLANK CHECK 1742 * error processing, both part of st_interpret_sense. 1743 */ 1744 int 1745 st_touch_tape(st) 1746 struct st_softc *st; 1747 { 1748 char *buf; 1749 int readsize; 1750 int error; 1751 1752 buf = malloc(1024, M_TEMP, M_NOWAIT); 1753 if (!buf) 1754 return ENOMEM; 1755 1756 if (error = st_mode_sense(st, 0)) 1757 goto bad; 1758 st->blksize = 1024; 1759 do { 1760 switch (st->blksize) { 1761 case 512: 1762 case 1024: 1763 readsize = st->blksize; 1764 st->flags |= ST_FIXEDBLOCKS; 1765 break; 1766 default: 1767 readsize = 1; 1768 st->flags &= ~ST_FIXEDBLOCKS; 1769 } 1770 if (error = st_mode_select(st, 0)) 1771 goto bad; 1772 st_read(st, buf, readsize, SCSI_SILENT); /* XXX */ 1773 if (error = st_rewind(st, 0, 0)) { 1774 bad: free(buf, M_TEMP); 1775 return error; 1776 } 1777 } while (readsize != 1 && readsize > st->blksize); 1778 1779 free(buf, M_TEMP); 1780 return 0; 1781 } 1782 1783 int 1784 stdump(dev, blkno, va, size) 1785 dev_t dev; 1786 daddr_t blkno; 1787 caddr_t va; 1788 size_t size; 1789 { 1790 1791 /* Not implemented. */ 1792 return ENXIO; 1793 } 1794