st.c revision 1.65
1 /* $NetBSD: st.c,v 1.65 1996/03/30 21:45:04 christos 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 (at) 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 (at) tfs.com) Sept 1992 47 * major changes by Julian Elischer (julian (at) 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 #include <sys/conf.h> 69 70 #include <scsi/scsi_all.h> 71 #include <scsi/scsi_tape.h> 72 #include <scsi/scsiconf.h> 73 74 /* Defines for device specific stuff */ 75 #define DEF_FIXED_BSIZE 512 76 #define ST_RETRIES 4 /* only on non IO commands */ 77 78 #define STMODE(z) ( minor(z) & 0x03) 79 #define STDSTY(z) ((minor(z) >> 2) & 0x03) 80 #define STUNIT(z) ((minor(z) >> 4) ) 81 #define CTLMODE 3 82 83 #define SCSI_2_MAX_DENSITY_CODE 0x17 /* maximum density code specified 84 * in SCSI II spec. */ 85 /* 86 * Define various devices that we know mis-behave in some way, 87 * and note how they are bad, so we can correct for them 88 */ 89 struct modes { 90 u_int quirks; /* same definitions as in quirkdata */ 91 int blksize; 92 u_int8_t density; 93 }; 94 95 struct quirkdata { 96 u_int quirks; 97 #define ST_Q_FORCE_BLKSIZE 0x0001 98 #define ST_Q_SENSE_HELP 0x0002 /* must do READ for good MODE SENSE */ 99 #define ST_Q_IGNORE_LOADS 0x0004 100 #define ST_Q_BLKSIZE 0x0008 /* variable-block media_blksize > 0 */ 101 u_int page_0_size; 102 #define MAX_PAGE_0_SIZE 64 103 struct modes modes[4]; 104 }; 105 106 struct st_quirk_inquiry_pattern { 107 struct scsi_inquiry_pattern pattern; 108 struct quirkdata quirkdata; 109 }; 110 111 struct st_quirk_inquiry_pattern st_quirk_patterns[] = { 112 {{T_SEQUENTIAL, T_REMOV, 113 " ", " ", " "}, {0, 0, { 114 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 115 {ST_Q_FORCE_BLKSIZE, 512, QIC_24}, /* minor 4-7 */ 116 {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_1600}, /* minor 8-11 */ 117 {ST_Q_FORCE_BLKSIZE, 0, HALFINCH_6250} /* minor 12-15 */ 118 }}}, 119 {{T_SEQUENTIAL, T_REMOV, 120 "TANDBERG", " TDC 3600 ", ""}, {0, 12, { 121 {0, 0, 0}, /* minor 0-3 */ 122 {ST_Q_FORCE_BLKSIZE, 0, QIC_525}, /* minor 4-7 */ 123 {0, 0, QIC_150}, /* minor 8-11 */ 124 {0, 0, QIC_120} /* minor 12-15 */ 125 }}}, 126 {{T_SEQUENTIAL, T_REMOV, 127 "TANDBERG", " TDC 3800 ", ""}, {0, 0, { 128 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 129 {0, 0, QIC_525}, /* minor 4-7 */ 130 {0, 0, QIC_150}, /* minor 8-11 */ 131 {0, 0, QIC_120} /* minor 12-15 */ 132 }}}, 133 /* 134 * At least -005 and -007 need this. I'll assume they all do unless I 135 * hear otherwise. - mycroft, 31MAR1994 136 */ 137 {{T_SEQUENTIAL, T_REMOV, 138 "ARCHIVE ", "VIPER 2525 25462", ""}, {0, 0, { 139 {ST_Q_SENSE_HELP, 0, 0}, /* minor 0-3 */ 140 {ST_Q_SENSE_HELP, 0, QIC_525}, /* minor 4-7 */ 141 {0, 0, QIC_150}, /* minor 8-11 */ 142 {0, 0, QIC_120} /* minor 12-15 */ 143 }}}, 144 /* 145 * One user reports that this works for his tape drive. It probably 146 * needs more work. - mycroft, 09APR1994 147 */ 148 {{T_SEQUENTIAL, T_REMOV, 149 "SANKYO ", "CP525 ", ""}, {0, 0, { 150 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 151 {ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */ 152 {0, 0, QIC_150}, /* minor 8-11 */ 153 {0, 0, QIC_120} /* minor 12-15 */ 154 }}}, 155 {{T_SEQUENTIAL, T_REMOV, 156 "ANRITSU ", "DMT780 ", ""}, {0, 0, { 157 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 158 {ST_Q_FORCE_BLKSIZE, 512, QIC_525}, /* minor 4-7 */ 159 {0, 0, QIC_150}, /* minor 8-11 */ 160 {0, 0, QIC_120} /* minor 12-15 */ 161 }}}, 162 {{T_SEQUENTIAL, T_REMOV, 163 "ARCHIVE ", "VIPER 150 21247", ""}, {0, 12, { 164 {0, 0, 0}, /* minor 0-3 */ 165 {0, 0, QIC_150}, /* minor 4-7 */ 166 {0, 0, QIC_120}, /* minor 8-11 */ 167 {0, 0, QIC_24} /* minor 12-15 */ 168 }}}, 169 {{T_SEQUENTIAL, T_REMOV, 170 "WANGTEK ", "5099ES SCSI", ""}, {0, 0, { 171 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 172 {0, 0, QIC_11}, /* minor 4-7 */ 173 {0, 0, QIC_24}, /* minor 8-11 */ 174 {0, 0, QIC_24} /* minor 12-15 */ 175 }}}, 176 {{T_SEQUENTIAL, T_REMOV, 177 "WANGTEK ", "5150ES SCSI", ""}, {0, 0, { 178 {ST_Q_FORCE_BLKSIZE, 512, 0}, /* minor 0-3 */ 179 {0, 0, QIC_24}, /* minor 4-7 */ 180 {0, 0, QIC_120}, /* minor 8-11 */ 181 {0, 0, QIC_150} /* minor 12-15 */ 182 }}}, 183 {{T_SEQUENTIAL, T_REMOV, 184 "WANGTEK ", "5525ES SCSI REV7", ""}, {0, 0, { 185 {0, 0, 0}, /* minor 0-3 */ 186 {ST_Q_BLKSIZE, 0, QIC_525}, /* minor 4-7 */ 187 {0, 0, QIC_150}, /* minor 8-11 */ 188 {0, 0, QIC_120} /* minor 12-15 */ 189 }}}, 190 {{T_SEQUENTIAL, T_REMOV, 191 "WangDAT ", "Model 1300 ", ""}, {0, 0, { 192 {0, 0, 0}, /* minor 0-3 */ 193 {ST_Q_FORCE_BLKSIZE, 512, DDS}, /* minor 4-7 */ 194 {ST_Q_FORCE_BLKSIZE, 1024, DDS}, /* minor 8-11 */ 195 {ST_Q_FORCE_BLKSIZE, 0, DDS} /* minor 12-15 */ 196 }}}, 197 {{T_SEQUENTIAL, T_REMOV, 198 "EXABYTE ", "EXB-8200 ", "263H"}, {0, 5, { 199 {0, 0, 0}, /* minor 0-3 */ 200 {0, 0, 0}, /* minor 4-7 */ 201 {0, 0, 0}, /* minor 8-11 */ 202 {0, 0, 0} /* minor 12-15 */ 203 }}}, 204 #if 0 205 {{T_SEQUENTIAL, T_REMOV, 206 "EXABYTE ", "EXB-8200 ", ""}, {0, 12, { 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 #endif 213 }; 214 215 #define NOEJECT 0 216 #define EJECT 1 217 218 struct st_softc { 219 struct device sc_dev; 220 /*--------------------present operating parameters, flags etc.----------------*/ 221 int flags; /* see below */ 222 u_int quirks; /* quirks for the open mode */ 223 int blksize; /* blksize we are using */ 224 u_int8_t density; /* present density */ 225 u_int page_0_size; /* size of page 0 data */ 226 u_int last_dsty; /* last density opened */ 227 /*--------------------device/scsi parameters----------------------------------*/ 228 struct scsi_link *sc_link; /* our link to the adpter etc. */ 229 /*--------------------parameters reported by the device ----------------------*/ 230 int blkmin; /* min blk size */ 231 int blkmax; /* max blk size */ 232 struct quirkdata *quirkdata; /* if we have a rogue entry */ 233 /*--------------------parameters reported by the device for this media--------*/ 234 u_long numblks; /* nominal blocks capacity */ 235 int media_blksize; /* 0 if not ST_FIXEDBLOCKS */ 236 u_int8_t media_density; /* this is what it said when asked */ 237 /*--------------------quirks for the whole drive------------------------------*/ 238 u_int drive_quirks; /* quirks of this drive */ 239 /*--------------------How we should set up when opening each minor device----*/ 240 struct modes modes[4]; /* plus more for each mode */ 241 u_int8_t modeflags[4]; /* flags for the modes */ 242 #define DENSITY_SET_BY_USER 0x01 243 #define DENSITY_SET_BY_QUIRK 0x02 244 #define BLKSIZE_SET_BY_USER 0x04 245 #define BLKSIZE_SET_BY_QUIRK 0x08 246 /*--------------------storage for sense data returned by the drive------------*/ 247 u_char sense_data[MAX_PAGE_0_SIZE]; /* 248 * additional sense data needed 249 * for mode sense/select. 250 */ 251 struct buf buf_queue; /* the queue of pending IO operations */ 252 }; 253 254 255 int stmatch __P((struct device *, void *, void *)); 256 void stattach __P((struct device *, struct device *, void *)); 257 void st_identify_drive __P((struct st_softc *, struct scsi_inquiry_data *)); 258 void st_loadquirks __P((struct st_softc *)); 259 int st_mount_tape __P((dev_t, int)); 260 void st_unmount __P((struct st_softc *, boolean)); 261 int st_decide_mode __P((struct st_softc *, boolean)); 262 void ststart __P((void *)); 263 int st_read __P((struct st_softc *, char *, int, int)); 264 int st_read_block_limits __P((struct st_softc *, int)); 265 int st_mode_sense __P((struct st_softc *, int)); 266 int st_mode_select __P((struct st_softc *, int)); 267 int st_space __P((struct st_softc *, int, u_int, int)); 268 int st_write_filemarks __P((struct st_softc *, int, int)); 269 int st_check_eod __P((struct st_softc *, boolean, int *, int)); 270 int st_load __P((struct st_softc *, u_int, int)); 271 int st_rewind __P((struct st_softc *, u_int, int)); 272 int st_interpret_sense __P((struct scsi_xfer *)); 273 int st_touch_tape __P((struct st_softc *)); 274 int st_erase __P((struct st_softc *, int full, int flags)); 275 276 struct cfattach st_ca = { 277 sizeof(struct st_softc), stmatch, stattach 278 }; 279 280 struct cfdriver st_cd = { 281 NULL, "st", DV_TAPE 282 }; 283 284 struct scsi_device st_switch = { 285 st_interpret_sense, 286 ststart, 287 NULL, 288 NULL, 289 }; 290 291 #define ST_INFO_VALID 0x0001 292 #define ST_BLOCK_SET 0x0002 /* block size, mode set by ioctl */ 293 #define ST_WRITTEN 0x0004 /* data have been written, EOD needed */ 294 #define ST_FIXEDBLOCKS 0x0008 295 #define ST_AT_FILEMARK 0x0010 296 #define ST_EIO_PENDING 0x0020 /* we couldn't report it then (had data) */ 297 #define ST_NEW_MOUNT 0x0040 /* still need to decide mode */ 298 #define ST_READONLY 0x0080 /* st_mode_sense says write protected */ 299 #define ST_FM_WRITTEN 0x0100 /* 300 * EOF file mark written -- used with 301 * ~ST_WRITTEN to indicate that multiple file 302 * marks have been written 303 */ 304 #define ST_BLANK_READ 0x0200 /* BLANK CHECK encountered already */ 305 #define ST_2FM_AT_EOD 0x0400 /* write 2 file marks at EOD */ 306 #define ST_MOUNTED 0x0800 /* Device is presently mounted */ 307 #define ST_DONTBUFFER 0x1000 /* Disable buffering/caching */ 308 309 #define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ) 310 #define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \ 311 ST_FIXEDBLOCKS | ST_READONLY | ST_FM_WRITTEN | \ 312 ST_2FM_AT_EOD | ST_PER_ACTION) 313 314 struct scsi_inquiry_pattern st_patterns[] = { 315 {T_SEQUENTIAL, T_REMOV, 316 "", "", ""}, 317 }; 318 319 int 320 stmatch(parent, match, aux) 321 struct device *parent; 322 void *match, *aux; 323 { 324 struct scsibus_attach_args *sa = aux; 325 int priority; 326 327 (void)scsi_inqmatch(sa->sa_inqbuf, 328 (caddr_t)st_patterns, sizeof(st_patterns)/sizeof(st_patterns[0]), 329 sizeof(st_patterns[0]), &priority); 330 return (priority); 331 } 332 333 /* 334 * The routine called by the low level scsi routine when it discovers 335 * A device suitable for this driver 336 */ 337 void 338 stattach(parent, self, aux) 339 struct device *parent, *self; 340 void *aux; 341 { 342 struct st_softc *st = (void *)self; 343 struct scsibus_attach_args *sa = aux; 344 struct scsi_link *sc_link = sa->sa_sc_link; 345 346 SC_DEBUG(sc_link, SDEV_DB2, ("stattach: ")); 347 348 /* 349 * Store information needed to contact our base driver 350 */ 351 st->sc_link = sc_link; 352 sc_link->device = &st_switch; 353 sc_link->device_softc = st; 354 sc_link->openings = 1; 355 356 /* 357 * Check if the drive is a known criminal and take 358 * Any steps needed to bring it into line 359 */ 360 st_identify_drive(st, sa->sa_inqbuf); 361 362 /* 363 * Use the subdriver to request information regarding 364 * the drive. We cannot use interrupts yet, so the 365 * request must specify this. 366 */ 367 printf("\n"); 368 printf("%s: %s", st->sc_dev.dv_xname, st->quirkdata ? "rogue, " : ""); 369 if (scsi_test_unit_ready(sc_link, 370 SCSI_AUTOCONF | SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE) || 371 st_mode_sense(st, 372 SCSI_AUTOCONF | SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE)) 373 printf("drive empty\n"); 374 else { 375 printf("density code 0x%x, ", st->media_density); 376 if (st->media_blksize > 0) 377 printf("%d-byte", st->media_blksize); 378 else 379 printf("variable"); 380 printf(" blocks, write-%s\n", 381 (st->flags & ST_READONLY) ? "protected" : "enabled"); 382 } 383 384 /* 385 * Set up the buf queue for this device 386 */ 387 st->buf_queue.b_active = 0; 388 st->buf_queue.b_actf = 0; 389 st->buf_queue.b_actb = &st->buf_queue.b_actf; 390 } 391 392 /* 393 * Use the inquiry routine in 'scsi_base' to get drive info so we can 394 * Further tailor our behaviour. 395 */ 396 void 397 st_identify_drive(st, inqbuf) 398 struct st_softc *st; 399 struct scsi_inquiry_data *inqbuf; 400 { 401 struct st_quirk_inquiry_pattern *finger; 402 int priority; 403 404 finger = (struct st_quirk_inquiry_pattern *)scsi_inqmatch(inqbuf, 405 (caddr_t)st_quirk_patterns, 406 sizeof(st_quirk_patterns)/sizeof(st_quirk_patterns[0]), 407 sizeof(st_quirk_patterns[0]), &priority); 408 if (priority != 0) { 409 st->quirkdata = &finger->quirkdata; 410 st->drive_quirks = finger->quirkdata.quirks; 411 st->quirks = finger->quirkdata.quirks; /* start value */ 412 st->page_0_size = finger->quirkdata.page_0_size; 413 st_loadquirks(st); 414 } 415 } 416 417 /* 418 * initialise the subdevices to the default (QUIRK) state. 419 * this will remove any setting made by the system operator or previous 420 * operations. 421 */ 422 void 423 st_loadquirks(st) 424 struct st_softc *st; 425 { 426 int i; 427 struct modes *mode; 428 struct modes *mode2; 429 430 mode = st->quirkdata->modes; 431 mode2 = st->modes; 432 for (i = 0; i < 4; i++) { 433 bzero(mode2, sizeof(struct modes)); 434 st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK | 435 DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER | 436 DENSITY_SET_BY_USER); 437 if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_BLKSIZE) { 438 mode2->blksize = mode->blksize; 439 st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK; 440 } 441 if (mode->density) { 442 mode2->density = mode->density; 443 st->modeflags[i] |= DENSITY_SET_BY_QUIRK; 444 } 445 mode++; 446 mode2++; 447 } 448 } 449 450 /* 451 * open the device. 452 */ 453 int 454 stopen(dev, flags, mode, p) 455 dev_t dev; 456 int flags; 457 int mode; 458 struct proc *p; 459 { 460 int unit; 461 u_int stmode, dsty; 462 int error = 0; 463 struct st_softc *st; 464 struct scsi_link *sc_link; 465 466 unit = STUNIT(dev); 467 if (unit >= st_cd.cd_ndevs) 468 return ENXIO; 469 st = st_cd.cd_devs[unit]; 470 if (!st) 471 return ENXIO; 472 473 stmode = STMODE(dev); 474 dsty = STDSTY(dev); 475 sc_link = st->sc_link; 476 477 SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev, 478 unit, st_cd.cd_ndevs)); 479 480 /* 481 * Only allow one at a time 482 */ 483 if (sc_link->flags & SDEV_OPEN) { 484 printf("%s: already open\n", st->sc_dev.dv_xname); 485 return EBUSY; 486 } 487 488 /* 489 * Catch any unit attention errors. 490 */ 491 error = scsi_test_unit_ready(sc_link, 492 SCSI_IGNORE_MEDIA_CHANGE | 493 (stmode == CTLMODE ? 494 SCSI_IGNORE_NOT_READY : 0)); 495 if (error) 496 goto bad; 497 498 sc_link->flags |= SDEV_OPEN; /* unit attn are now errors */ 499 500 /* 501 * If the mode is 3 (e.g. minor = 3,7,11,15) 502 * then the device has been opened to set defaults 503 * This mode does NOT ALLOW I/O, only ioctls 504 */ 505 if (stmode == CTLMODE) 506 return 0; 507 508 /* 509 * if it's a different mode, or if the media has been 510 * invalidated, unmount the tape from the previous 511 * session but continue with open processing 512 */ 513 if (st->last_dsty != dsty || !(sc_link->flags & SDEV_MEDIA_LOADED)) 514 st_unmount(st, NOEJECT); 515 516 /* 517 * If we are not mounted, then we should start a new 518 * mount session. 519 */ 520 if (!(st->flags & ST_MOUNTED)) { 521 st_mount_tape(dev, flags); 522 st->last_dsty = dsty; 523 } 524 525 /* 526 * Make sure that a tape opened in write-only mode will have 527 * file marks written on it when closed, even if not written to. 528 * This is for SUN compatibility 529 */ 530 if ((flags & O_ACCMODE) == FWRITE) 531 st->flags |= ST_WRITTEN; 532 533 SC_DEBUG(sc_link, SDEV_DB2, ("open complete\n")); 534 return 0; 535 536 bad: 537 st_unmount(st, NOEJECT); 538 sc_link->flags &= ~SDEV_OPEN; 539 return error; 540 } 541 542 /* 543 * close the device.. only called if we are the LAST 544 * occurence of an open device 545 */ 546 int 547 stclose(dev, flags, mode, p) 548 dev_t dev; 549 int flags; 550 int mode; 551 struct proc *p; 552 { 553 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)]; 554 555 SC_DEBUG(st->sc_link, SDEV_DB1, ("closing\n")); 556 if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) 557 st_write_filemarks(st, 1, 0); 558 switch (STMODE(dev)) { 559 case 0: 560 case 3: /* for now */ 561 st_unmount(st, NOEJECT); 562 break; 563 case 1: 564 /* leave mounted unless media seems to have been removed */ 565 if (!(st->sc_link->flags & SDEV_MEDIA_LOADED)) 566 st_unmount(st, NOEJECT); 567 break; 568 case 2: 569 st_unmount(st, EJECT); 570 break; 571 } 572 st->sc_link->flags &= ~SDEV_OPEN; 573 574 return 0; 575 } 576 577 /* 578 * Start a new mount session. 579 * Copy in all the default parameters from the selected device mode. 580 * and try guess any that seem to be defaulted. 581 */ 582 int 583 st_mount_tape(dev, flags) 584 dev_t dev; 585 int flags; 586 { 587 int unit; 588 u_int mode, dsty; 589 struct st_softc *st; 590 struct scsi_link *sc_link; 591 int error = 0; 592 593 unit = STUNIT(dev); 594 mode = STMODE(dev); 595 dsty = STDSTY(dev); 596 st = st_cd.cd_devs[unit]; 597 sc_link = st->sc_link; 598 599 if (st->flags & ST_MOUNTED) 600 return 0; 601 602 SC_DEBUG(sc_link, SDEV_DB1, ("mounting\n ")); 603 st->flags |= ST_NEW_MOUNT; 604 st->quirks = st->drive_quirks | st->modes[dsty].quirks; 605 /* 606 * If the media is new, then make sure we give it a chance to 607 * to do a 'load' instruction. (We assume it is new.) 608 */ 609 if ((error = st_load(st, LD_LOAD, 0)) != 0) 610 return error; 611 /* 612 * Throw another dummy instruction to catch 613 * 'Unit attention' errors. Some drives appear to give 614 * these after doing a Load instruction. 615 * (noteably some DAT drives) 616 */ 617 scsi_test_unit_ready(sc_link, SCSI_SILENT); /* XXX */ 618 619 /* 620 * Some devices can't tell you much until they have been 621 * asked to look at the media. This quirk does this. 622 */ 623 if (st->quirks & ST_Q_SENSE_HELP) 624 if ((error = st_touch_tape(st)) != 0) 625 return error; 626 /* 627 * Load the physical device parameters 628 * loads: blkmin, blkmax 629 */ 630 if ((error = st_read_block_limits(st, 0)) != 0) 631 return error; 632 /* 633 * Load the media dependent parameters 634 * includes: media_blksize,media_density,numblks 635 * As we have a tape in, it should be reflected here. 636 * If not you may need the "quirk" above. 637 */ 638 if ((error = st_mode_sense(st, 0)) != 0) 639 return error; 640 /* 641 * If we have gained a permanent density from somewhere, 642 * then use it in preference to the one supplied by 643 * default by the driver. 644 */ 645 if (st->modeflags[dsty] & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER)) 646 st->density = st->modes[dsty].density; 647 else 648 st->density = st->media_density; 649 /* 650 * If we have gained a permanent blocksize 651 * then use it in preference to the one supplied by 652 * default by the driver. 653 */ 654 st->flags &= ~ST_FIXEDBLOCKS; 655 if (st->modeflags[dsty] & (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) { 656 st->blksize = st->modes[dsty].blksize; 657 if (st->blksize) 658 st->flags |= ST_FIXEDBLOCKS; 659 } else { 660 if ((error = st_decide_mode(st, FALSE)) != 0) 661 return error; 662 } 663 if ((error = st_mode_select(st, 0)) != 0) { 664 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 665 return error; 666 } 667 scsi_prevent(sc_link, PR_PREVENT, 668 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 669 st->flags &= ~ST_NEW_MOUNT; 670 st->flags |= ST_MOUNTED; 671 sc_link->flags |= SDEV_MEDIA_LOADED; /* move earlier? */ 672 673 return 0; 674 } 675 676 /* 677 * End the present mount session. 678 * Rewind, and optionally eject the tape. 679 * Reset various flags to indicate that all new 680 * operations require another mount operation 681 */ 682 void 683 st_unmount(st, eject) 684 struct st_softc *st; 685 boolean eject; 686 { 687 struct scsi_link *sc_link = st->sc_link; 688 int nmarks; 689 690 if (!(st->flags & ST_MOUNTED)) 691 return; 692 SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n")); 693 st_check_eod(st, FALSE, &nmarks, SCSI_IGNORE_NOT_READY); 694 st_rewind(st, 0, SCSI_IGNORE_NOT_READY); 695 scsi_prevent(sc_link, PR_ALLOW, 696 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 697 if (eject) 698 st_load(st, LD_UNLOAD, SCSI_IGNORE_NOT_READY); 699 st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT); 700 sc_link->flags &= ~SDEV_MEDIA_LOADED; 701 } 702 703 /* 704 * Given all we know about the device, media, mode, 'quirks' and 705 * initial operation, make a decision as to how we should be set 706 * to run (regarding blocking and EOD marks) 707 */ 708 int 709 st_decide_mode(st, first_read) 710 struct st_softc *st; 711 boolean first_read; 712 { 713 #ifdef SCSIDEBUG 714 struct scsi_link *sc_link = st->sc_link; 715 #endif 716 717 SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n")); 718 719 /* 720 * If the drive can only handle fixed-length blocks and only at 721 * one size, perhaps we should just do that. 722 */ 723 if (st->blkmin && (st->blkmin == st->blkmax)) { 724 st->flags |= ST_FIXEDBLOCKS; 725 st->blksize = st->blkmin; 726 SC_DEBUG(sc_link, SDEV_DB3, 727 ("blkmin == blkmax of %d\n", st->blkmin)); 728 goto done; 729 } 730 /* 731 * If the tape density mandates (or even suggests) use of fixed 732 * or variable-length blocks, comply. 733 */ 734 switch (st->density) { 735 case HALFINCH_800: 736 case HALFINCH_1600: 737 case HALFINCH_6250: 738 case DDS: 739 st->flags &= ~ST_FIXEDBLOCKS; 740 st->blksize = 0; 741 SC_DEBUG(sc_link, SDEV_DB3, ("density specified variable\n")); 742 goto done; 743 case QIC_11: 744 case QIC_24: 745 case QIC_120: 746 case QIC_150: 747 case QIC_525: 748 case QIC_1320: 749 st->flags |= ST_FIXEDBLOCKS; 750 if (st->media_blksize > 0) 751 st->blksize = st->media_blksize; 752 else 753 st->blksize = DEF_FIXED_BSIZE; 754 SC_DEBUG(sc_link, SDEV_DB3, ("density specified fixed\n")); 755 goto done; 756 } 757 /* 758 * If we're about to read the tape, perhaps we should choose 759 * fixed or variable-length blocks and block size according to 760 * what the drive found on the tape. 761 */ 762 if (first_read && 763 (!(st->quirks & ST_Q_BLKSIZE) || (st->media_blksize == 0) || 764 (st->media_blksize == DEF_FIXED_BSIZE) || 765 (st->media_blksize == 1024))) { 766 if (st->media_blksize > 0) 767 st->flags |= ST_FIXEDBLOCKS; 768 else 769 st->flags &= ~ST_FIXEDBLOCKS; 770 st->blksize = st->media_blksize; 771 SC_DEBUG(sc_link, SDEV_DB3, 772 ("Used media_blksize of %d\n", st->media_blksize)); 773 goto done; 774 } 775 /* 776 * We're getting no hints from any direction. Choose variable- 777 * length blocks arbitrarily. 778 */ 779 st->flags &= ~ST_FIXEDBLOCKS; 780 st->blksize = 0; 781 SC_DEBUG(sc_link, SDEV_DB3, 782 ("Give up and default to variable mode\n")); 783 784 done: 785 /* 786 * Decide whether or not to write two file marks to signify end- 787 * of-data. Make the decision as a function of density. If 788 * the decision is not to use a second file mark, the SCSI BLANK 789 * CHECK condition code will be recognized as end-of-data when 790 * first read. 791 * (I think this should be a by-product of fixed/variable..julian) 792 */ 793 switch (st->density) { 794 /* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ 795 case QIC_11: 796 case QIC_24: 797 case QIC_120: 798 case QIC_150: 799 case QIC_525: 800 case QIC_1320: 801 st->flags &= ~ST_2FM_AT_EOD; 802 break; 803 default: 804 st->flags |= ST_2FM_AT_EOD; 805 } 806 return 0; 807 } 808 809 /* 810 * Actually translate the requested transfer into 811 * one the physical driver can understand 812 * The transfer is described by a buf and will include 813 * only one physical transfer. 814 */ 815 void 816 ststrategy(bp) 817 struct buf *bp; 818 { 819 struct st_softc *st = st_cd.cd_devs[STUNIT(bp->b_dev)]; 820 struct buf *dp; 821 int s; 822 823 SC_DEBUG(st->sc_link, SDEV_DB1, 824 ("ststrategy %d bytes @ blk %d\n", bp->b_bcount, bp->b_blkno)); 825 /* 826 * If it's a null transfer, return immediatly 827 */ 828 if (bp->b_bcount == 0) 829 goto done; 830 /* 831 * Odd sized request on fixed drives are verboten 832 */ 833 if (st->flags & ST_FIXEDBLOCKS) { 834 if (bp->b_bcount % st->blksize) { 835 printf("%s: bad request, must be multiple of %d\n", 836 st->sc_dev.dv_xname, st->blksize); 837 bp->b_error = EIO; 838 goto bad; 839 } 840 } 841 /* 842 * as are out-of-range requests on variable drives. 843 */ 844 else if (bp->b_bcount < st->blkmin || 845 (st->blkmax && bp->b_bcount > st->blkmax)) { 846 printf("%s: bad request, must be between %d and %d\n", 847 st->sc_dev.dv_xname, st->blkmin, st->blkmax); 848 bp->b_error = EIO; 849 goto bad; 850 } 851 s = splbio(); 852 853 /* 854 * Place it in the queue of activities for this tape 855 * at the end (a bit silly because we only have on user.. 856 * (but it could fork())) 857 */ 858 dp = &st->buf_queue; 859 bp->b_actf = NULL; 860 bp->b_actb = dp->b_actb; 861 *dp->b_actb = bp; 862 dp->b_actb = &bp->b_actf; 863 864 /* 865 * Tell the device to get going on the transfer if it's 866 * not doing anything, otherwise just wait for completion 867 * (All a bit silly if we're only allowing 1 open but..) 868 */ 869 ststart(st); 870 871 splx(s); 872 return; 873 bad: 874 bp->b_flags |= B_ERROR; 875 done: 876 /* 877 * Correctly set the buf to indicate a completed xfer 878 */ 879 bp->b_resid = bp->b_bcount; 880 biodone(bp); 881 return; 882 } 883 884 /* 885 * ststart looks to see if there is a buf waiting for the device 886 * and that the device is not already busy. If both are true, 887 * It dequeues the buf and creates a scsi command to perform the 888 * transfer required. The transfer request will call scsi_done 889 * on completion, which will in turn call this routine again 890 * so that the next queued transfer is performed. 891 * The bufs are queued by the strategy routine (ststrategy) 892 * 893 * This routine is also called after other non-queued requests 894 * have been made of the scsi driver, to ensure that the queue 895 * continues to be drained. 896 * ststart() is called at splbio 897 */ 898 void 899 ststart(v) 900 void *v; 901 { 902 struct st_softc *st = v; 903 struct scsi_link *sc_link = st->sc_link; 904 register struct buf *bp, *dp; 905 struct scsi_rw_tape cmd; 906 int flags; 907 908 SC_DEBUG(sc_link, SDEV_DB2, ("ststart ")); 909 /* 910 * See if there is a buf to do and we are not already 911 * doing one 912 */ 913 while (sc_link->openings > 0) { 914 /* if a special awaits, let it proceed first */ 915 if (sc_link->flags & SDEV_WAITING) { 916 sc_link->flags &= ~SDEV_WAITING; 917 wakeup((caddr_t)sc_link); 918 return; 919 } 920 921 dp = &st->buf_queue; 922 if ((bp = dp->b_actf) == NULL) 923 return; 924 if ((dp = bp->b_actf) != NULL) 925 dp->b_actb = bp->b_actb; 926 else 927 st->buf_queue.b_actb = bp->b_actb; 928 *bp->b_actb = dp; 929 930 /* 931 * if the device has been unmounted byt the user 932 * then throw away all requests until done 933 */ 934 if (!(st->flags & ST_MOUNTED) || 935 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 936 /* make sure that one implies the other.. */ 937 sc_link->flags &= ~SDEV_MEDIA_LOADED; 938 bp->b_flags |= B_ERROR; 939 bp->b_error = EIO; 940 biodone(bp); 941 continue; 942 } 943 /* 944 * only FIXEDBLOCK devices have pending operations 945 */ 946 if (st->flags & ST_FIXEDBLOCKS) { 947 /* 948 * If we are at a filemark but have not reported it yet 949 * then we should report it now 950 */ 951 if (st->flags & ST_AT_FILEMARK) { 952 if ((bp->b_flags & B_READ) == B_WRITE) { 953 /* 954 * Handling of ST_AT_FILEMARK in 955 * st_space will fill in the right file 956 * mark count. 957 * Back up over filemark 958 */ 959 if (st_space(st, 0, SP_FILEMARKS, 0)) { 960 bp->b_flags |= B_ERROR; 961 bp->b_error = EIO; 962 biodone(bp); 963 continue; 964 } 965 } else { 966 bp->b_resid = bp->b_bcount; 967 bp->b_error = 0; 968 bp->b_flags &= ~B_ERROR; 969 st->flags &= ~ST_AT_FILEMARK; 970 biodone(bp); 971 continue; /* seek more work */ 972 } 973 } 974 /* 975 * If we are at EIO (e.g. EOM) but have not reported it 976 * yet then we should report it now 977 */ 978 if (st->flags & ST_EIO_PENDING) { 979 bp->b_resid = bp->b_bcount; 980 bp->b_error = EIO; 981 bp->b_flags |= B_ERROR; 982 st->flags &= ~ST_EIO_PENDING; 983 biodone(bp); 984 continue; /* seek more work */ 985 } 986 } 987 988 /* 989 * Fill out the scsi command 990 */ 991 bzero(&cmd, sizeof(cmd)); 992 if ((bp->b_flags & B_READ) == B_WRITE) { 993 cmd.opcode = WRITE; 994 st->flags &= ~ST_FM_WRITTEN; 995 st->flags |= ST_WRITTEN; 996 flags = SCSI_DATA_OUT; 997 } else { 998 cmd.opcode = READ; 999 flags = SCSI_DATA_IN; 1000 } 1001 1002 /* 1003 * Handle "fixed-block-mode" tape drives by using the 1004 * block count instead of the length. 1005 */ 1006 if (st->flags & ST_FIXEDBLOCKS) { 1007 cmd.byte2 |= SRW_FIXED; 1008 _lto3b(bp->b_bcount / st->blksize, cmd.len); 1009 } else 1010 _lto3b(bp->b_bcount, cmd.len); 1011 1012 /* 1013 * go ask the adapter to do all this for us 1014 */ 1015 if (scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1016 sizeof(cmd), (u_char *) bp->b_data, bp->b_bcount, 0, 1017 100000, bp, flags | SCSI_NOSLEEP)) 1018 printf("%s: not queued\n", st->sc_dev.dv_xname); 1019 } /* go back and see if we can cram more work in.. */ 1020 } 1021 1022 int 1023 stread(dev, uio, iomode) 1024 dev_t dev; 1025 struct uio *uio; 1026 int iomode; 1027 { 1028 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)]; 1029 1030 return (physio(ststrategy, NULL, dev, B_READ, 1031 st->sc_link->adapter->scsi_minphys, uio)); 1032 } 1033 1034 int 1035 stwrite(dev, uio, iomode) 1036 dev_t dev; 1037 struct uio *uio; 1038 int iomode; 1039 { 1040 struct st_softc *st = st_cd.cd_devs[STUNIT(dev)]; 1041 1042 return (physio(ststrategy, NULL, dev, B_WRITE, 1043 st->sc_link->adapter->scsi_minphys, uio)); 1044 } 1045 1046 /* 1047 * Perform special action on behalf of the user; 1048 * knows about the internals of this device 1049 */ 1050 int 1051 stioctl(dev, cmd, arg, flag, p) 1052 dev_t dev; 1053 u_long cmd; 1054 caddr_t arg; 1055 int flag; 1056 struct proc *p; 1057 { 1058 int error = 0; 1059 int unit; 1060 int number, nmarks, dsty; 1061 int flags; 1062 struct st_softc *st; 1063 int hold_blksize; 1064 u_int8_t hold_density; 1065 struct mtop *mt = (struct mtop *) arg; 1066 1067 /* 1068 * Find the device that the user is talking about 1069 */ 1070 flags = 0; /* give error messages, act on errors etc. */ 1071 unit = STUNIT(dev); 1072 dsty = STDSTY(dev); 1073 st = st_cd.cd_devs[unit]; 1074 hold_blksize = st->blksize; 1075 hold_density = st->density; 1076 1077 switch (cmd) { 1078 1079 case MTIOCGET: { 1080 struct mtget *g = (struct mtget *) arg; 1081 1082 SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: get status]\n")); 1083 bzero(g, sizeof(struct mtget)); 1084 g->mt_type = 0x7; /* Ultrix compat *//*? */ 1085 g->mt_blksiz = st->blksize; 1086 g->mt_density = st->density; 1087 g->mt_mblksiz[0] = st->modes[0].blksize; 1088 g->mt_mblksiz[1] = st->modes[1].blksize; 1089 g->mt_mblksiz[2] = st->modes[2].blksize; 1090 g->mt_mblksiz[3] = st->modes[3].blksize; 1091 g->mt_mdensity[0] = st->modes[0].density; 1092 g->mt_mdensity[1] = st->modes[1].density; 1093 g->mt_mdensity[2] = st->modes[2].density; 1094 g->mt_mdensity[3] = st->modes[3].density; 1095 break; 1096 } 1097 case MTIOCTOP: { 1098 1099 SC_DEBUG(st->sc_link, SDEV_DB1, 1100 ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, mt->mt_count)); 1101 1102 /* compat: in U*x it is a short */ 1103 number = mt->mt_count; 1104 switch ((short) (mt->mt_op)) { 1105 case MTWEOF: /* write an end-of-file record */ 1106 error = st_write_filemarks(st, number, flags); 1107 break; 1108 case MTBSF: /* backward space file */ 1109 number = -number; 1110 case MTFSF: /* forward space file */ 1111 error = st_check_eod(st, FALSE, &nmarks, flags); 1112 if (!error) 1113 error = st_space(st, number - nmarks, 1114 SP_FILEMARKS, flags); 1115 break; 1116 case MTBSR: /* backward space record */ 1117 number = -number; 1118 case MTFSR: /* forward space record */ 1119 error = st_check_eod(st, TRUE, &nmarks, flags); 1120 if (!error) 1121 error = st_space(st, number, SP_BLKS, flags); 1122 break; 1123 case MTREW: /* rewind */ 1124 error = st_rewind(st, 0, flags); 1125 break; 1126 case MTOFFL: /* rewind and put the drive offline */ 1127 st_unmount(st, EJECT); 1128 break; 1129 case MTNOP: /* no operation, sets status only */ 1130 break; 1131 case MTRETEN: /* retension the tape */ 1132 error = st_load(st, LD_RETENSION, flags); 1133 if (!error) 1134 error = st_load(st, LD_LOAD, flags); 1135 break; 1136 case MTEOM: /* forward space to end of media */ 1137 error = st_check_eod(st, FALSE, &nmarks, flags); 1138 if (!error) 1139 error = st_space(st, 1, SP_EOM, flags); 1140 break; 1141 case MTCACHE: /* enable controller cache */ 1142 st->flags &= ~ST_DONTBUFFER; 1143 goto try_new_value; 1144 case MTNOCACHE: /* disable controller cache */ 1145 st->flags |= ST_DONTBUFFER; 1146 goto try_new_value; 1147 case MTERASE: /* erase volume */ 1148 error = st_erase(st, number, flags); 1149 break; 1150 case MTSETBSIZ: /* Set block size for device */ 1151 #ifdef NOTYET 1152 if (!(st->flags & ST_NEW_MOUNT)) { 1153 uprintf("re-mount tape before changing blocksize"); 1154 error = EINVAL; 1155 break; 1156 } 1157 #endif 1158 if (number == 0) { 1159 st->flags &= ~ST_FIXEDBLOCKS; 1160 } else { 1161 if ((st->blkmin || st->blkmax) && 1162 (number < st->blkmin || 1163 number > st->blkmax)) { 1164 error = EINVAL; 1165 break; 1166 } 1167 st->flags |= ST_FIXEDBLOCKS; 1168 } 1169 st->blksize = number; 1170 st->flags |= ST_BLOCK_SET; /*XXX */ 1171 goto try_new_value; 1172 1173 case MTSETDNSTY: /* Set density for device and mode */ 1174 if (number > SCSI_2_MAX_DENSITY_CODE) { 1175 error = EINVAL; 1176 break; 1177 } else 1178 st->density = number; 1179 goto try_new_value; 1180 1181 default: 1182 error = EINVAL; 1183 } 1184 break; 1185 } 1186 case MTIOCIEOT: 1187 case MTIOCEEOT: 1188 break; 1189 default: 1190 if (STMODE(dev) == CTLMODE) 1191 error = scsi_do_ioctl(st->sc_link, dev, cmd, arg, flag, p); 1192 else 1193 error = ENOTTY; 1194 break; 1195 } 1196 return error; 1197 /*-----------------------------*/ 1198 try_new_value: 1199 /* 1200 * Check that the mode being asked for is aggreeable to the 1201 * drive. If not, put it back the way it was. 1202 */ 1203 if ((error = st_mode_select(st, 0)) != 0) {/* put it back as it was */ 1204 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 1205 st->density = hold_density; 1206 st->blksize = hold_blksize; 1207 if (st->blksize) 1208 st->flags |= ST_FIXEDBLOCKS; 1209 else 1210 st->flags &= ~ST_FIXEDBLOCKS; 1211 return error; 1212 } 1213 /* 1214 * As the drive liked it, if we are setting a new default, 1215 * set it into the structures as such. 1216 * 1217 * The means for deciding this are not finalised yet 1218 */ 1219 if (STMODE(dev) == 0x03) { 1220 /* special mode */ 1221 /* XXX */ 1222 switch ((short) (mt->mt_op)) { 1223 case MTSETBSIZ: 1224 st->modes[dsty].blksize = st->blksize; 1225 st->modeflags[dsty] |= BLKSIZE_SET_BY_USER; 1226 break; 1227 case MTSETDNSTY: 1228 st->modes[dsty].density = st->density; 1229 st->modeflags[dsty] |= DENSITY_SET_BY_USER; 1230 break; 1231 } 1232 } 1233 return 0; 1234 } 1235 1236 /* 1237 * Do a synchronous read. 1238 */ 1239 int 1240 st_read(st, buf, size, flags) 1241 struct st_softc *st; 1242 int size; 1243 int flags; 1244 char *buf; 1245 { 1246 struct scsi_rw_tape cmd; 1247 1248 /* 1249 * If it's a null transfer, return immediatly 1250 */ 1251 if (size == 0) 1252 return 0; 1253 bzero(&cmd, sizeof(cmd)); 1254 cmd.opcode = READ; 1255 if (st->flags & ST_FIXEDBLOCKS) { 1256 cmd.byte2 |= SRW_FIXED; 1257 _lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE), 1258 cmd.len); 1259 } else 1260 _lto3b(size, cmd.len); 1261 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1262 sizeof(cmd), (u_char *) buf, size, 0, 100000, NULL, 1263 flags | SCSI_DATA_IN); 1264 } 1265 1266 /* 1267 * Ask the drive what it's min and max blk sizes are. 1268 */ 1269 int 1270 st_read_block_limits(st, flags) 1271 struct st_softc *st; 1272 int flags; 1273 { 1274 struct scsi_block_limits cmd; 1275 struct scsi_block_limits_data block_limits; 1276 struct scsi_link *sc_link = st->sc_link; 1277 int error; 1278 1279 /* 1280 * First check if we have it all loaded 1281 */ 1282 if ((sc_link->flags & SDEV_MEDIA_LOADED)) 1283 return 0; 1284 1285 /* 1286 * do a 'Read Block Limits' 1287 */ 1288 bzero(&cmd, sizeof(cmd)); 1289 cmd.opcode = READ_BLOCK_LIMITS; 1290 1291 /* 1292 * do the command, update the global values 1293 */ 1294 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1295 sizeof(cmd), (u_char *) &block_limits, 1296 sizeof(block_limits), ST_RETRIES, 5000, 1297 NULL, flags | SCSI_DATA_IN); 1298 if (error) 1299 return error; 1300 1301 st->blkmin = _2btol(block_limits.min_length); 1302 st->blkmax = _3btol(block_limits.max_length); 1303 1304 SC_DEBUG(sc_link, SDEV_DB3, 1305 ("(%d <= blksize <= %d)\n", st->blkmin, st->blkmax)); 1306 return 0; 1307 } 1308 1309 /* 1310 * Get the scsi driver to send a full inquiry to the 1311 * device and use the results to fill out the global 1312 * parameter structure. 1313 * 1314 * called from: 1315 * attach 1316 * open 1317 * ioctl (to reset original blksize) 1318 */ 1319 int 1320 st_mode_sense(st, flags) 1321 struct st_softc *st; 1322 int flags; 1323 { 1324 u_int scsi_sense_len; 1325 int error; 1326 struct scsi_mode_sense cmd; 1327 struct scsi_sense { 1328 struct scsi_mode_header header; 1329 struct scsi_blk_desc blk_desc; 1330 u_char sense_data[MAX_PAGE_0_SIZE]; 1331 } scsi_sense; 1332 struct scsi_link *sc_link = st->sc_link; 1333 1334 scsi_sense_len = 12 + st->page_0_size; 1335 1336 /* 1337 * Set up a mode sense 1338 */ 1339 bzero(&cmd, sizeof(cmd)); 1340 cmd.opcode = MODE_SENSE; 1341 cmd.length = scsi_sense_len; 1342 1343 /* 1344 * do the command, but we don't need the results 1345 * just print them for our interest's sake, if asked, 1346 * or if we need it as a template for the mode select 1347 * store it away. 1348 */ 1349 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1350 sizeof(cmd), (u_char *) &scsi_sense, 1351 scsi_sense_len, ST_RETRIES, 5000, NULL, 1352 flags | SCSI_DATA_IN); 1353 if (error) 1354 return error; 1355 1356 st->numblks = _3btol(scsi_sense.blk_desc.nblocks); 1357 st->media_blksize = _3btol(scsi_sense.blk_desc.blklen); 1358 st->media_density = scsi_sense.blk_desc.density; 1359 if (scsi_sense.header.dev_spec & SMH_DSP_WRITE_PROT) 1360 st->flags |= ST_READONLY; 1361 SC_DEBUG(sc_link, SDEV_DB3, 1362 ("density code 0x%x, %d-byte blocks, write-%s, ", 1363 st->media_density, st->media_blksize, 1364 st->flags & ST_READONLY ? "protected" : "enabled")); 1365 SC_DEBUG(sc_link, SDEV_DB3, 1366 ("%sbuffered\n", 1367 scsi_sense.header.dev_spec & SMH_DSP_BUFF_MODE ? "" : "un")); 1368 if (st->page_0_size) 1369 bcopy(scsi_sense.sense_data, st->sense_data, st->page_0_size); 1370 sc_link->flags |= SDEV_MEDIA_LOADED; 1371 return 0; 1372 } 1373 1374 /* 1375 * Send a filled out parameter structure to the drive to 1376 * set it into the desire modes etc. 1377 */ 1378 int 1379 st_mode_select(st, flags) 1380 struct st_softc *st; 1381 int flags; 1382 { 1383 u_int scsi_select_len; 1384 struct scsi_mode_select cmd; 1385 struct scsi_select { 1386 struct scsi_mode_header header; 1387 struct scsi_blk_desc blk_desc; 1388 u_char sense_data[MAX_PAGE_0_SIZE]; 1389 } scsi_select; 1390 struct scsi_link *sc_link = st->sc_link; 1391 1392 scsi_select_len = 12 + st->page_0_size; 1393 1394 /* 1395 * Set up for a mode select 1396 */ 1397 bzero(&cmd, sizeof(cmd)); 1398 cmd.opcode = MODE_SELECT; 1399 cmd.length = scsi_select_len; 1400 1401 bzero(&scsi_select, scsi_select_len); 1402 scsi_select.header.blk_desc_len = sizeof(struct scsi_blk_desc); 1403 scsi_select.header.dev_spec &= ~SMH_DSP_BUFF_MODE; 1404 scsi_select.blk_desc.density = st->density; 1405 if (st->flags & ST_DONTBUFFER) 1406 scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_OFF; 1407 else 1408 scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_ON; 1409 if (st->flags & ST_FIXEDBLOCKS) 1410 _lto3b(st->blksize, scsi_select.blk_desc.blklen); 1411 if (st->page_0_size) 1412 bcopy(st->sense_data, scsi_select.sense_data, st->page_0_size); 1413 1414 /* 1415 * do the command 1416 */ 1417 return scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1418 sizeof(cmd), (u_char *) &scsi_select, scsi_select_len, 1419 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_OUT); 1420 } 1421 1422 /* 1423 * issue an erase command 1424 */ 1425 int 1426 st_erase(st, full, flags) 1427 struct st_softc *st; 1428 int full, flags; 1429 { 1430 struct scsi_erase cmd; 1431 1432 /* 1433 * Full erase means set LONG bit in erase command, which asks 1434 * the drive to erase the entire unit. Without this bit, we're 1435 * asking the drive to write an erase gap. 1436 */ 1437 bzero(&cmd, sizeof(cmd)); 1438 cmd.opcode = ERASE; 1439 if (full) 1440 cmd.byte2 = SE_IMMED|SE_LONG; 1441 else 1442 cmd.byte2 = SE_IMMED; 1443 1444 /* 1445 * XXX We always do this asynchronously, for now. How long should 1446 * we wait if we want to (eventually) to it synchronously? 1447 */ 1448 return (scsi_scsi_cmd(st->sc_link, (struct scsi_generic *)&cmd, 1449 sizeof(cmd), 0, 0, ST_RETRIES, 5000, NULL, flags)); 1450 } 1451 1452 /* 1453 * skip N blocks/filemarks/seq filemarks/eom 1454 */ 1455 int 1456 st_space(st, number, what, flags) 1457 struct st_softc *st; 1458 u_int what; 1459 int flags; 1460 int number; 1461 { 1462 struct scsi_space cmd; 1463 int error; 1464 1465 switch (what) { 1466 case SP_BLKS: 1467 if (st->flags & ST_PER_ACTION) { 1468 if (number > 0) { 1469 st->flags &= ~ST_PER_ACTION; 1470 return EIO; 1471 } else if (number < 0) { 1472 if (st->flags & ST_AT_FILEMARK) { 1473 /* 1474 * Handling of ST_AT_FILEMARK 1475 * in st_space will fill in the 1476 * right file mark count. 1477 */ 1478 error = st_space(st, 0, SP_FILEMARKS, 1479 flags); 1480 if (error) 1481 return error; 1482 } 1483 if (st->flags & ST_BLANK_READ) { 1484 st->flags &= ~ST_BLANK_READ; 1485 return EIO; 1486 } 1487 st->flags &= ~ST_EIO_PENDING; 1488 } 1489 } 1490 break; 1491 case SP_FILEMARKS: 1492 if (st->flags & ST_EIO_PENDING) { 1493 if (number > 0) { 1494 /* pretend we just discovered the error */ 1495 st->flags &= ~ST_EIO_PENDING; 1496 return EIO; 1497 } else if (number < 0) { 1498 /* back away from the error */ 1499 st->flags &= ~ST_EIO_PENDING; 1500 } 1501 } 1502 if (st->flags & ST_AT_FILEMARK) { 1503 st->flags &= ~ST_AT_FILEMARK; 1504 number--; 1505 } 1506 if ((st->flags & ST_BLANK_READ) && (number < 0)) { 1507 /* back away from unwritten tape */ 1508 st->flags &= ~ST_BLANK_READ; 1509 number++; /* XXX dubious */ 1510 } 1511 break; 1512 case SP_EOM: 1513 if (st->flags & ST_EIO_PENDING) { 1514 /* pretend we just discovered the error */ 1515 st->flags &= ~ST_EIO_PENDING; 1516 return EIO; 1517 } 1518 if (st->flags & ST_AT_FILEMARK) 1519 st->flags &= ~ST_AT_FILEMARK; 1520 break; 1521 } 1522 if (number == 0) 1523 return 0; 1524 1525 bzero(&cmd, sizeof(cmd)); 1526 cmd.opcode = SPACE; 1527 cmd.byte2 = what; 1528 _lto3b(number, cmd.number); 1529 1530 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1531 sizeof(cmd), 0, 0, 0, 900000, NULL, flags); 1532 } 1533 1534 /* 1535 * write N filemarks 1536 */ 1537 int 1538 st_write_filemarks(st, number, flags) 1539 struct st_softc *st; 1540 int flags; 1541 int number; 1542 { 1543 struct scsi_write_filemarks cmd; 1544 1545 /* 1546 * It's hard to write a negative number of file marks. 1547 * Don't try. 1548 */ 1549 if (number < 0) 1550 return EINVAL; 1551 switch (number) { 1552 case 0: /* really a command to sync the drive's buffers */ 1553 break; 1554 case 1: 1555 if (st->flags & ST_FM_WRITTEN) /* already have one down */ 1556 st->flags &= ~ST_WRITTEN; 1557 else 1558 st->flags |= ST_FM_WRITTEN; 1559 st->flags &= ~ST_PER_ACTION; 1560 break; 1561 default: 1562 st->flags &= ~(ST_PER_ACTION | ST_WRITTEN); 1563 } 1564 1565 bzero(&cmd, sizeof(cmd)); 1566 cmd.opcode = WRITE_FILEMARKS; 1567 _lto3b(number, cmd.number); 1568 1569 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1570 sizeof(cmd), 0, 0, 0, 100000, NULL, flags); 1571 } 1572 1573 /* 1574 * Make sure the right number of file marks is on tape if the 1575 * tape has been written. If the position argument is true, 1576 * leave the tape positioned where it was originally. 1577 * 1578 * nmarks returns the number of marks to skip (or, if position 1579 * true, which were skipped) to get back original position. 1580 */ 1581 int 1582 st_check_eod(st, position, nmarks, flags) 1583 struct st_softc *st; 1584 boolean position; 1585 int *nmarks; 1586 int flags; 1587 { 1588 int error; 1589 1590 switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) { 1591 default: 1592 *nmarks = 0; 1593 return 0; 1594 case ST_WRITTEN: 1595 case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD: 1596 *nmarks = 1; 1597 break; 1598 case ST_WRITTEN | ST_2FM_AT_EOD: 1599 *nmarks = 2; 1600 } 1601 error = st_write_filemarks(st, *nmarks, flags); 1602 if (position && !error) 1603 error = st_space(st, -*nmarks, SP_FILEMARKS, flags); 1604 return error; 1605 } 1606 1607 /* 1608 * load/unload/retension 1609 */ 1610 int 1611 st_load(st, type, flags) 1612 struct st_softc *st; 1613 u_int type; 1614 int flags; 1615 { 1616 struct scsi_load cmd; 1617 1618 if (type != LD_LOAD) { 1619 int error; 1620 int nmarks; 1621 1622 error = st_check_eod(st, FALSE, &nmarks, flags); 1623 if (error) 1624 return error; 1625 } 1626 if (st->quirks & ST_Q_IGNORE_LOADS) 1627 return 0; 1628 1629 bzero(&cmd, sizeof(cmd)); 1630 cmd.opcode = LOAD; 1631 cmd.how = type; 1632 1633 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1634 sizeof(cmd), 0, 0, ST_RETRIES, 300000, NULL, flags); 1635 } 1636 1637 /* 1638 * Rewind the device 1639 */ 1640 int 1641 st_rewind(st, immediate, flags) 1642 struct st_softc *st; 1643 u_int immediate; 1644 int flags; 1645 { 1646 struct scsi_rewind cmd; 1647 int error; 1648 int nmarks; 1649 1650 error = st_check_eod(st, FALSE, &nmarks, flags); 1651 if (error) 1652 return error; 1653 st->flags &= ~ST_PER_ACTION; 1654 1655 bzero(&cmd, sizeof(cmd)); 1656 cmd.opcode = REWIND; 1657 cmd.byte2 = immediate; 1658 1659 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1660 sizeof(cmd), 0, 0, ST_RETRIES, immediate ? 5000 : 300000, NULL, 1661 flags); 1662 } 1663 1664 /* 1665 * Look at the returned sense and act on the error and detirmine 1666 * The unix error number to pass back... (0 = report no error) 1667 * (-1 = continue processing) 1668 */ 1669 int 1670 st_interpret_sense(xs) 1671 struct scsi_xfer *xs; 1672 { 1673 struct scsi_link *sc_link = xs->sc_link; 1674 struct scsi_sense_data *sense = &xs->sense; 1675 struct buf *bp = xs->bp; 1676 struct st_softc *st = sc_link->device_softc; 1677 u_int8_t key; 1678 int32_t info; 1679 1680 /* 1681 * Get the sense fields and work out what code 1682 */ 1683 if (sense->error_code & SSD_ERRCODE_VALID) 1684 info = _4btol(sense->info); 1685 else 1686 info = xs->datalen; /* bad choice if fixed blocks */ 1687 if ((sense->error_code & SSD_ERRCODE) != 0x70) 1688 return -1; /* let the generic code handle it */ 1689 if (st->flags & ST_FIXEDBLOCKS) { 1690 xs->resid = info * st->blksize; 1691 if (sense->flags & SSD_EOM) { 1692 st->flags |= ST_EIO_PENDING; 1693 if (bp) 1694 bp->b_resid = xs->resid; 1695 } 1696 if (sense->flags & SSD_FILEMARK) { 1697 st->flags |= ST_AT_FILEMARK; 1698 if (bp) 1699 bp->b_resid = xs->resid; 1700 } 1701 if (sense->flags & SSD_ILI) { 1702 st->flags |= ST_EIO_PENDING; 1703 if (bp) 1704 bp->b_resid = xs->resid; 1705 if (sense->error_code & SSD_ERRCODE_VALID && 1706 (xs->flags & SCSI_SILENT) == 0) 1707 printf("%s: block wrong size, %d blocks residual\n", 1708 st->sc_dev.dv_xname, info); 1709 1710 /* 1711 * This quirk code helps the drive read 1712 * the first tape block, regardless of 1713 * format. That is required for these 1714 * drives to return proper MODE SENSE 1715 * information. 1716 */ 1717 if ((st->quirks & ST_Q_SENSE_HELP) && 1718 !(sc_link->flags & SDEV_MEDIA_LOADED)) 1719 st->blksize -= 512; 1720 } 1721 /* 1722 * If no data was tranfered, do it immediatly 1723 */ 1724 if (xs->resid >= xs->datalen) { 1725 if (st->flags & ST_EIO_PENDING) 1726 return EIO; 1727 if (st->flags & ST_AT_FILEMARK) { 1728 if (bp) 1729 bp->b_resid = xs->resid; 1730 return 0; 1731 } 1732 } 1733 } else { /* must be variable mode */ 1734 xs->resid = xs->datalen; /* to be sure */ 1735 if (sense->flags & SSD_EOM) 1736 return EIO; 1737 if (sense->flags & SSD_FILEMARK) { 1738 if (bp) 1739 bp->b_resid = bp->b_bcount; 1740 return 0; 1741 } 1742 if (sense->flags & SSD_ILI) { 1743 if (info < 0) { 1744 /* 1745 * the record was bigger than the read 1746 */ 1747 if ((xs->flags & SCSI_SILENT) == 0) 1748 printf("%s: %d-byte record too big\n", 1749 st->sc_dev.dv_xname, 1750 xs->datalen - info); 1751 return EIO; 1752 } 1753 xs->resid = info; 1754 if (bp) 1755 bp->b_resid = info; 1756 } 1757 } 1758 key = sense->flags & SSD_KEY; 1759 1760 if (key == 0x8) { 1761 /* 1762 * This quirk code helps the drive read the 1763 * first tape block, regardless of format. That 1764 * is required for these drives to return proper 1765 * MODE SENSE information. 1766 */ 1767 if ((st->quirks & ST_Q_SENSE_HELP) && 1768 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 1769 /* still starting */ 1770 st->blksize -= 512; 1771 } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) { 1772 st->flags |= ST_BLANK_READ; 1773 xs->resid = xs->datalen; 1774 if (bp) { 1775 bp->b_resid = xs->resid; 1776 /* return an EOF */ 1777 } 1778 return 0; 1779 } 1780 } 1781 return -1; /* let the default/generic handler handle it */ 1782 } 1783 1784 /* 1785 * The quirk here is that the drive returns some value to st_mode_sense 1786 * incorrectly until the tape has actually passed by the head. 1787 * 1788 * The method is to set the drive to large fixed-block state (user-specified 1789 * density and 1024-byte blocks), then read and rewind to get it to sense the 1790 * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't 1791 * work, as a last resort, try variable- length blocks. The result will be 1792 * the ability to do an accurate st_mode_sense. 1793 * 1794 * We know we can do a rewind because we just did a load, which implies rewind. 1795 * Rewind seems preferable to space backward if we have a virgin tape. 1796 * 1797 * The rest of the code for this quirk is in ILI processing and BLANK CHECK 1798 * error processing, both part of st_interpret_sense. 1799 */ 1800 int 1801 st_touch_tape(st) 1802 struct st_softc *st; 1803 { 1804 char *buf; 1805 int readsize; 1806 int error; 1807 1808 buf = malloc(1024, M_TEMP, M_NOWAIT); 1809 if (!buf) 1810 return ENOMEM; 1811 1812 if ((error = st_mode_sense(st, 0)) != 0) 1813 goto bad; 1814 st->blksize = 1024; 1815 do { 1816 switch (st->blksize) { 1817 case 512: 1818 case 1024: 1819 readsize = st->blksize; 1820 st->flags |= ST_FIXEDBLOCKS; 1821 break; 1822 default: 1823 readsize = 1; 1824 st->flags &= ~ST_FIXEDBLOCKS; 1825 } 1826 if ((error = st_mode_select(st, 0)) != 0) 1827 goto bad; 1828 st_read(st, buf, readsize, SCSI_SILENT); /* XXX */ 1829 if ((error = st_rewind(st, 0, 0)) != 0) { 1830 bad: free(buf, M_TEMP); 1831 return error; 1832 } 1833 } while (readsize != 1 && readsize > st->blksize); 1834 1835 free(buf, M_TEMP); 1836 return 0; 1837 } 1838 1839 int 1840 stdump(dev, blkno, va, size) 1841 dev_t dev; 1842 daddr_t blkno; 1843 caddr_t va; 1844 size_t size; 1845 { 1846 1847 /* Not implemented. */ 1848 return ENXIO; 1849 } 1850
Indexes created Sun Sep 21 20:09:37 GMT 2025