st.c revision 1.60
1 /* $NetBSD: st.c,v 1.60 1996/02/17 16:00:22 jtk 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 69 #include <scsi/scsi_all.h> 70 #include <scsi/scsi_tape.h> 71 #include <scsi/scsiconf.h> 72 #include <scsi/scsi_conf.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 cfdriver stcd = { 277 NULL, "st", stmatch, stattach, DV_TAPE, sizeof(struct st_softc) 278 }; 279 280 struct scsi_device st_switch = { 281 st_interpret_sense, 282 ststart, 283 NULL, 284 NULL, 285 }; 286 287 #define ST_INFO_VALID 0x0001 288 #define ST_BLOCK_SET 0x0002 /* block size, mode set by ioctl */ 289 #define ST_WRITTEN 0x0004 /* data have been written, EOD needed */ 290 #define ST_FIXEDBLOCKS 0x0008 291 #define ST_AT_FILEMARK 0x0010 292 #define ST_EIO_PENDING 0x0020 /* we couldn't report it then (had data) */ 293 #define ST_NEW_MOUNT 0x0040 /* still need to decide mode */ 294 #define ST_READONLY 0x0080 /* st_mode_sense says write protected */ 295 #define ST_FM_WRITTEN 0x0100 /* 296 * EOF file mark written -- used with 297 * ~ST_WRITTEN to indicate that multiple file 298 * marks have been written 299 */ 300 #define ST_BLANK_READ 0x0200 /* BLANK CHECK encountered already */ 301 #define ST_2FM_AT_EOD 0x0400 /* write 2 file marks at EOD */ 302 #define ST_MOUNTED 0x0800 /* Device is presently mounted */ 303 #define ST_DONTBUFFER 0x1000 /* Disable buffering/caching */ 304 305 #define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ) 306 #define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \ 307 ST_FIXEDBLOCKS | ST_READONLY | ST_FM_WRITTEN | \ 308 ST_2FM_AT_EOD | ST_PER_ACTION) 309 310 struct scsi_inquiry_pattern st_patterns[] = { 311 {T_SEQUENTIAL, T_REMOV, 312 "", "", ""}, 313 }; 314 315 int 316 stmatch(parent, match, aux) 317 struct device *parent; 318 void *match, *aux; 319 { 320 struct scsibus_attach_args *sa = aux; 321 int priority; 322 323 (void)scsi_inqmatch(sa->sa_inqbuf, 324 (caddr_t)st_patterns, sizeof(st_patterns)/sizeof(st_patterns[0]), 325 sizeof(st_patterns[0]), &priority); 326 return (priority); 327 } 328 329 /* 330 * The routine called by the low level scsi routine when it discovers 331 * A device suitable for this driver 332 */ 333 void 334 stattach(parent, self, aux) 335 struct device *parent, *self; 336 void *aux; 337 { 338 struct st_softc *st = (void *)self; 339 struct scsibus_attach_args *sa = aux; 340 struct scsi_link *sc_link = sa->sa_sc_link; 341 342 SC_DEBUG(sc_link, SDEV_DB2, ("stattach: ")); 343 344 /* 345 * Store information needed to contact our base driver 346 */ 347 st->sc_link = sc_link; 348 sc_link->device = &st_switch; 349 sc_link->device_softc = st; 350 sc_link->openings = 1; 351 352 /* 353 * Check if the drive is a known criminal and take 354 * Any steps needed to bring it into line 355 */ 356 st_identify_drive(st, sa->sa_inqbuf); 357 358 /* 359 * Use the subdriver to request information regarding 360 * the drive. We cannot use interrupts yet, so the 361 * request must specify this. 362 */ 363 printf(": %s", st->quirkdata ? "rogue, " : ""); 364 if (scsi_test_unit_ready(sc_link, 365 SCSI_AUTOCONF | SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE) || 366 st_mode_sense(st, 367 SCSI_AUTOCONF | SCSI_SILENT | SCSI_IGNORE_MEDIA_CHANGE)) 368 printf("drive empty\n"); 369 else { 370 printf("density code 0x%x, ", st->media_density); 371 if (st->media_blksize > 0) 372 printf("%d-byte", st->media_blksize); 373 else 374 printf("variable"); 375 printf(" blocks, write-%s\n", 376 (st->flags & ST_READONLY) ? "protected" : "enabled"); 377 } 378 379 /* 380 * Set up the buf queue for this device 381 */ 382 st->buf_queue.b_active = 0; 383 st->buf_queue.b_actf = 0; 384 st->buf_queue.b_actb = &st->buf_queue.b_actf; 385 } 386 387 /* 388 * Use the inquiry routine in 'scsi_base' to get drive info so we can 389 * Further tailor our behaviour. 390 */ 391 void 392 st_identify_drive(st, inqbuf) 393 struct st_softc *st; 394 struct scsi_inquiry_data *inqbuf; 395 { 396 struct st_quirk_inquiry_pattern *finger; 397 int priority; 398 399 finger = (struct st_quirk_inquiry_pattern *)scsi_inqmatch(inqbuf, 400 (caddr_t)st_quirk_patterns, 401 sizeof(st_quirk_patterns)/sizeof(st_quirk_patterns[0]), 402 sizeof(st_quirk_patterns[0]), &priority); 403 if (priority != 0) { 404 st->quirkdata = &finger->quirkdata; 405 st->drive_quirks = finger->quirkdata.quirks; 406 st->quirks = finger->quirkdata.quirks; /* start value */ 407 st->page_0_size = finger->quirkdata.page_0_size; 408 st_loadquirks(st); 409 } 410 } 411 412 /* 413 * initialise the subdevices to the default (QUIRK) state. 414 * this will remove any setting made by the system operator or previous 415 * operations. 416 */ 417 void 418 st_loadquirks(st) 419 struct st_softc *st; 420 { 421 int i; 422 struct modes *mode; 423 struct modes *mode2; 424 425 mode = st->quirkdata->modes; 426 mode2 = st->modes; 427 for (i = 0; i < 4; i++) { 428 bzero(mode2, sizeof(struct modes)); 429 st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK | 430 DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER | 431 DENSITY_SET_BY_USER); 432 if ((mode->quirks | st->drive_quirks) & ST_Q_FORCE_BLKSIZE) { 433 mode2->blksize = mode->blksize; 434 st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK; 435 } 436 if (mode->density) { 437 mode2->density = mode->density; 438 st->modeflags[i] |= DENSITY_SET_BY_QUIRK; 439 } 440 mode++; 441 mode2++; 442 } 443 } 444 445 /* 446 * open the device. 447 */ 448 int 449 stopen(dev, flags, mode, p) 450 dev_t dev; 451 int flags; 452 int mode; 453 struct proc *p; 454 { 455 int unit; 456 u_int stmode, dsty; 457 int error = 0; 458 struct st_softc *st; 459 struct scsi_link *sc_link; 460 461 unit = STUNIT(dev); 462 if (unit >= stcd.cd_ndevs) 463 return ENXIO; 464 st = stcd.cd_devs[unit]; 465 if (!st) 466 return ENXIO; 467 468 stmode = STMODE(dev); 469 dsty = STDSTY(dev); 470 sc_link = st->sc_link; 471 472 SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev, 473 unit, stcd.cd_ndevs)); 474 475 /* 476 * Only allow one at a time 477 */ 478 if (sc_link->flags & SDEV_OPEN) { 479 printf("%s: already open\n", st->sc_dev.dv_xname); 480 return EBUSY; 481 } 482 483 /* 484 * Catch any unit attention errors. 485 */ 486 error = scsi_test_unit_ready(sc_link, 487 SCSI_IGNORE_MEDIA_CHANGE | 488 (stmode == CTLMODE ? 489 SCSI_IGNORE_NOT_READY : 0)); 490 if (error) 491 goto bad; 492 493 sc_link->flags |= SDEV_OPEN; /* unit attn are now errors */ 494 495 /* 496 * If the mode is 3 (e.g. minor = 3,7,11,15) 497 * then the device has been opened to set defaults 498 * This mode does NOT ALLOW I/O, only ioctls 499 */ 500 if (stmode == CTLMODE) 501 return 0; 502 503 /* 504 * if it's a different mode, or if the media has been 505 * invalidated, unmount the tape from the previous 506 * session but continue with open processing 507 */ 508 if (st->last_dsty != dsty || !(sc_link->flags & SDEV_MEDIA_LOADED)) 509 st_unmount(st, NOEJECT); 510 511 /* 512 * If we are not mounted, then we should start a new 513 * mount session. 514 */ 515 if (!(st->flags & ST_MOUNTED)) { 516 st_mount_tape(dev, flags); 517 st->last_dsty = dsty; 518 } 519 520 /* 521 * Make sure that a tape opened in write-only mode will have 522 * file marks written on it when closed, even if not written to. 523 * This is for SUN compatibility 524 */ 525 if ((flags & O_ACCMODE) == FWRITE) 526 st->flags |= ST_WRITTEN; 527 528 SC_DEBUG(sc_link, SDEV_DB2, ("open complete\n")); 529 return 0; 530 531 bad: 532 st_unmount(st, NOEJECT); 533 sc_link->flags &= ~SDEV_OPEN; 534 return error; 535 } 536 537 /* 538 * close the device.. only called if we are the LAST 539 * occurence of an open device 540 */ 541 int 542 stclose(dev, flags, mode, p) 543 dev_t dev; 544 int flags; 545 int mode; 546 struct proc *p; 547 { 548 struct st_softc *st = stcd.cd_devs[STUNIT(dev)]; 549 550 SC_DEBUG(st->sc_link, SDEV_DB1, ("closing\n")); 551 if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) 552 st_write_filemarks(st, 1, 0); 553 switch (STMODE(dev)) { 554 case 0: 555 case 3: /* for now */ 556 st_unmount(st, NOEJECT); 557 break; 558 case 1: 559 /* leave mounted unless media seems to have been removed */ 560 if (!(st->sc_link->flags & SDEV_MEDIA_LOADED)) 561 st_unmount(st, NOEJECT); 562 break; 563 case 2: 564 st_unmount(st, EJECT); 565 break; 566 } 567 st->sc_link->flags &= ~SDEV_OPEN; 568 569 return 0; 570 } 571 572 /* 573 * Start a new mount session. 574 * Copy in all the default parameters from the selected device mode. 575 * and try guess any that seem to be defaulted. 576 */ 577 int 578 st_mount_tape(dev, flags) 579 dev_t dev; 580 int flags; 581 { 582 int unit; 583 u_int mode, dsty; 584 struct st_softc *st; 585 struct scsi_link *sc_link; 586 int error = 0; 587 588 unit = STUNIT(dev); 589 mode = STMODE(dev); 590 dsty = STDSTY(dev); 591 st = stcd.cd_devs[unit]; 592 sc_link = st->sc_link; 593 594 if (st->flags & ST_MOUNTED) 595 return 0; 596 597 SC_DEBUG(sc_link, SDEV_DB1, ("mounting\n ")); 598 st->flags |= ST_NEW_MOUNT; 599 st->quirks = st->drive_quirks | st->modes[dsty].quirks; 600 /* 601 * If the media is new, then make sure we give it a chance to 602 * to do a 'load' instruction. (We assume it is new.) 603 */ 604 if ((error = st_load(st, LD_LOAD, 0)) != 0) 605 return error; 606 /* 607 * Throw another dummy instruction to catch 608 * 'Unit attention' errors. Some drives appear to give 609 * these after doing a Load instruction. 610 * (noteably some DAT drives) 611 */ 612 scsi_test_unit_ready(sc_link, SCSI_SILENT); /* XXX */ 613 614 /* 615 * Some devices can't tell you much until they have been 616 * asked to look at the media. This quirk does this. 617 */ 618 if (st->quirks & ST_Q_SENSE_HELP) 619 if ((error = st_touch_tape(st)) != 0) 620 return error; 621 /* 622 * Load the physical device parameters 623 * loads: blkmin, blkmax 624 */ 625 if ((error = st_read_block_limits(st, 0)) != 0) 626 return error; 627 /* 628 * Load the media dependent parameters 629 * includes: media_blksize,media_density,numblks 630 * As we have a tape in, it should be reflected here. 631 * If not you may need the "quirk" above. 632 */ 633 if ((error = st_mode_sense(st, 0)) != 0) 634 return error; 635 /* 636 * If we have gained a permanent density from somewhere, 637 * then use it in preference to the one supplied by 638 * default by the driver. 639 */ 640 if (st->modeflags[dsty] & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER)) 641 st->density = st->modes[dsty].density; 642 else 643 st->density = st->media_density; 644 /* 645 * If we have gained a permanent blocksize 646 * then use it in preference to the one supplied by 647 * default by the driver. 648 */ 649 st->flags &= ~ST_FIXEDBLOCKS; 650 if (st->modeflags[dsty] & (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) { 651 st->blksize = st->modes[dsty].blksize; 652 if (st->blksize) 653 st->flags |= ST_FIXEDBLOCKS; 654 } else { 655 if ((error = st_decide_mode(st, FALSE)) != 0) 656 return error; 657 } 658 if ((error = st_mode_select(st, 0)) != 0) { 659 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 660 return error; 661 } 662 scsi_prevent(sc_link, PR_PREVENT, 663 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 664 st->flags &= ~ST_NEW_MOUNT; 665 st->flags |= ST_MOUNTED; 666 sc_link->flags |= SDEV_MEDIA_LOADED; /* move earlier? */ 667 668 return 0; 669 } 670 671 /* 672 * End the present mount session. 673 * Rewind, and optionally eject the tape. 674 * Reset various flags to indicate that all new 675 * operations require another mount operation 676 */ 677 void 678 st_unmount(st, eject) 679 struct st_softc *st; 680 boolean eject; 681 { 682 struct scsi_link *sc_link = st->sc_link; 683 int nmarks; 684 685 if (!(st->flags & ST_MOUNTED)) 686 return; 687 SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n")); 688 st_check_eod(st, FALSE, &nmarks, SCSI_IGNORE_NOT_READY); 689 st_rewind(st, 0, SCSI_IGNORE_NOT_READY); 690 scsi_prevent(sc_link, PR_ALLOW, 691 SCSI_IGNORE_ILLEGAL_REQUEST | SCSI_IGNORE_NOT_READY); 692 if (eject) 693 st_load(st, LD_UNLOAD, SCSI_IGNORE_NOT_READY); 694 st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT); 695 sc_link->flags &= ~SDEV_MEDIA_LOADED; 696 } 697 698 /* 699 * Given all we know about the device, media, mode, 'quirks' and 700 * initial operation, make a decision as to how we should be set 701 * to run (regarding blocking and EOD marks) 702 */ 703 int 704 st_decide_mode(st, first_read) 705 struct st_softc *st; 706 boolean first_read; 707 { 708 #ifdef SCSIDEBUG 709 struct scsi_link *sc_link = st->sc_link; 710 #endif 711 712 SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n")); 713 714 /* 715 * If the drive can only handle fixed-length blocks and only at 716 * one size, perhaps we should just do that. 717 */ 718 if (st->blkmin && (st->blkmin == st->blkmax)) { 719 st->flags |= ST_FIXEDBLOCKS; 720 st->blksize = st->blkmin; 721 SC_DEBUG(sc_link, SDEV_DB3, 722 ("blkmin == blkmax of %d\n", st->blkmin)); 723 goto done; 724 } 725 /* 726 * If the tape density mandates (or even suggests) use of fixed 727 * or variable-length blocks, comply. 728 */ 729 switch (st->density) { 730 case HALFINCH_800: 731 case HALFINCH_1600: 732 case HALFINCH_6250: 733 case DDS: 734 st->flags &= ~ST_FIXEDBLOCKS; 735 st->blksize = 0; 736 SC_DEBUG(sc_link, SDEV_DB3, ("density specified variable\n")); 737 goto done; 738 case QIC_11: 739 case QIC_24: 740 case QIC_120: 741 case QIC_150: 742 case QIC_525: 743 case QIC_1320: 744 st->flags |= ST_FIXEDBLOCKS; 745 if (st->media_blksize > 0) 746 st->blksize = st->media_blksize; 747 else 748 st->blksize = DEF_FIXED_BSIZE; 749 SC_DEBUG(sc_link, SDEV_DB3, ("density specified fixed\n")); 750 goto done; 751 } 752 /* 753 * If we're about to read the tape, perhaps we should choose 754 * fixed or variable-length blocks and block size according to 755 * what the drive found on the tape. 756 */ 757 if (first_read && 758 (!(st->quirks & ST_Q_BLKSIZE) || (st->media_blksize == 0) || 759 (st->media_blksize == DEF_FIXED_BSIZE) || 760 (st->media_blksize == 1024))) { 761 if (st->media_blksize > 0) 762 st->flags |= ST_FIXEDBLOCKS; 763 else 764 st->flags &= ~ST_FIXEDBLOCKS; 765 st->blksize = st->media_blksize; 766 SC_DEBUG(sc_link, SDEV_DB3, 767 ("Used media_blksize of %d\n", st->media_blksize)); 768 goto done; 769 } 770 /* 771 * We're getting no hints from any direction. Choose variable- 772 * length blocks arbitrarily. 773 */ 774 st->flags &= ~ST_FIXEDBLOCKS; 775 st->blksize = 0; 776 SC_DEBUG(sc_link, SDEV_DB3, 777 ("Give up and default to variable mode\n")); 778 779 done: 780 /* 781 * Decide whether or not to write two file marks to signify end- 782 * of-data. Make the decision as a function of density. If 783 * the decision is not to use a second file mark, the SCSI BLANK 784 * CHECK condition code will be recognized as end-of-data when 785 * first read. 786 * (I think this should be a by-product of fixed/variable..julian) 787 */ 788 switch (st->density) { 789 /* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ 790 case QIC_11: 791 case QIC_24: 792 case QIC_120: 793 case QIC_150: 794 case QIC_525: 795 case QIC_1320: 796 st->flags &= ~ST_2FM_AT_EOD; 797 break; 798 default: 799 st->flags |= ST_2FM_AT_EOD; 800 } 801 return 0; 802 } 803 804 /* 805 * Actually translate the requested transfer into 806 * one the physical driver can understand 807 * The transfer is described by a buf and will include 808 * only one physical transfer. 809 */ 810 void 811 ststrategy(bp) 812 struct buf *bp; 813 { 814 struct st_softc *st = stcd.cd_devs[STUNIT(bp->b_dev)]; 815 struct buf *dp; 816 int s; 817 818 SC_DEBUG(st->sc_link, SDEV_DB1, 819 ("ststrategy %d bytes @ blk %d\n", bp->b_bcount, bp->b_blkno)); 820 /* 821 * If it's a null transfer, return immediatly 822 */ 823 if (bp->b_bcount == 0) 824 goto done; 825 /* 826 * Odd sized request on fixed drives are verboten 827 */ 828 if (st->flags & ST_FIXEDBLOCKS) { 829 if (bp->b_bcount % st->blksize) { 830 printf("%s: bad request, must be multiple of %d\n", 831 st->sc_dev.dv_xname, st->blksize); 832 bp->b_error = EIO; 833 goto bad; 834 } 835 } 836 /* 837 * as are out-of-range requests on variable drives. 838 */ 839 else if (bp->b_bcount < st->blkmin || 840 (st->blkmax && bp->b_bcount > st->blkmax)) { 841 printf("%s: bad request, must be between %d and %d\n", 842 st->sc_dev.dv_xname, st->blkmin, st->blkmax); 843 bp->b_error = EIO; 844 goto bad; 845 } 846 s = splbio(); 847 848 /* 849 * Place it in the queue of activities for this tape 850 * at the end (a bit silly because we only have on user.. 851 * (but it could fork())) 852 */ 853 dp = &st->buf_queue; 854 bp->b_actf = NULL; 855 bp->b_actb = dp->b_actb; 856 *dp->b_actb = bp; 857 dp->b_actb = &bp->b_actf; 858 859 /* 860 * Tell the device to get going on the transfer if it's 861 * not doing anything, otherwise just wait for completion 862 * (All a bit silly if we're only allowing 1 open but..) 863 */ 864 ststart(st); 865 866 splx(s); 867 return; 868 bad: 869 bp->b_flags |= B_ERROR; 870 done: 871 /* 872 * Correctly set the buf to indicate a completed xfer 873 */ 874 bp->b_resid = bp->b_bcount; 875 biodone(bp); 876 return; 877 } 878 879 /* 880 * ststart looks to see if there is a buf waiting for the device 881 * and that the device is not already busy. If both are true, 882 * It dequeues the buf and creates a scsi command to perform the 883 * transfer required. The transfer request will call scsi_done 884 * on completion, which will in turn call this routine again 885 * so that the next queued transfer is performed. 886 * The bufs are queued by the strategy routine (ststrategy) 887 * 888 * This routine is also called after other non-queued requests 889 * have been made of the scsi driver, to ensure that the queue 890 * continues to be drained. 891 * ststart() is called at splbio 892 */ 893 void 894 ststart(v) 895 void *v; 896 { 897 struct st_softc *st = v; 898 struct scsi_link *sc_link = st->sc_link; 899 register struct buf *bp, *dp; 900 struct scsi_rw_tape cmd; 901 int flags; 902 903 SC_DEBUG(sc_link, SDEV_DB2, ("ststart ")); 904 /* 905 * See if there is a buf to do and we are not already 906 * doing one 907 */ 908 while (sc_link->openings > 0) { 909 /* if a special awaits, let it proceed first */ 910 if (sc_link->flags & SDEV_WAITING) { 911 sc_link->flags &= ~SDEV_WAITING; 912 wakeup((caddr_t)sc_link); 913 return; 914 } 915 916 bp = st->buf_queue.b_actf; 917 if (!bp) 918 return; /* no work to bother with */ 919 if ((dp = bp->b_actf) != NULL) 920 dp->b_actb = bp->b_actb; 921 else 922 st->buf_queue.b_actb = bp->b_actb; 923 *bp->b_actb = dp; 924 925 /* 926 * if the device has been unmounted byt the user 927 * then throw away all requests until done 928 */ 929 if (!(st->flags & ST_MOUNTED) || 930 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 931 /* make sure that one implies the other.. */ 932 sc_link->flags &= ~SDEV_MEDIA_LOADED; 933 bp->b_flags |= B_ERROR; 934 bp->b_error = EIO; 935 biodone(bp); 936 continue; 937 } 938 /* 939 * only FIXEDBLOCK devices have pending operations 940 */ 941 if (st->flags & ST_FIXEDBLOCKS) { 942 /* 943 * If we are at a filemark but have not reported it yet 944 * then we should report it now 945 */ 946 if (st->flags & ST_AT_FILEMARK) { 947 if ((bp->b_flags & B_READ) == B_WRITE) { 948 /* 949 * Handling of ST_AT_FILEMARK in 950 * st_space will fill in the right file 951 * mark count. 952 * Back up over filemark 953 */ 954 if (st_space(st, 0, SP_FILEMARKS, 0)) { 955 bp->b_flags |= B_ERROR; 956 bp->b_error = EIO; 957 biodone(bp); 958 continue; 959 } 960 } else { 961 bp->b_resid = bp->b_bcount; 962 bp->b_error = 0; 963 bp->b_flags &= ~B_ERROR; 964 st->flags &= ~ST_AT_FILEMARK; 965 biodone(bp); 966 continue; /* seek more work */ 967 } 968 } 969 /* 970 * If we are at EIO (e.g. EOM) but have not reported it 971 * yet then we should report it now 972 */ 973 if (st->flags & ST_EIO_PENDING) { 974 bp->b_resid = bp->b_bcount; 975 bp->b_error = EIO; 976 bp->b_flags |= B_ERROR; 977 st->flags &= ~ST_EIO_PENDING; 978 biodone(bp); 979 continue; /* seek more work */ 980 } 981 } 982 983 /* 984 * Fill out the scsi command 985 */ 986 bzero(&cmd, sizeof(cmd)); 987 if ((bp->b_flags & B_READ) == B_WRITE) { 988 cmd.opcode = WRITE; 989 st->flags &= ~ST_FM_WRITTEN; 990 st->flags |= ST_WRITTEN; 991 flags = SCSI_DATA_OUT; 992 } else { 993 cmd.opcode = READ; 994 flags = SCSI_DATA_IN; 995 } 996 997 /* 998 * Handle "fixed-block-mode" tape drives by using the 999 * block count instead of the length. 1000 */ 1001 if (st->flags & ST_FIXEDBLOCKS) { 1002 cmd.byte2 |= SRW_FIXED; 1003 lto3b(bp->b_bcount / st->blksize, cmd.len); 1004 } else 1005 lto3b(bp->b_bcount, cmd.len); 1006 1007 /* 1008 * go ask the adapter to do all this for us 1009 */ 1010 if (scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1011 sizeof(cmd), (u_char *) bp->b_data, bp->b_bcount, 0, 1012 100000, bp, flags | SCSI_NOSLEEP)) 1013 printf("%s: not queued\n", st->sc_dev.dv_xname); 1014 } /* go back and see if we can cram more work in.. */ 1015 } 1016 1017 int 1018 stread(dev, uio, iomode) 1019 dev_t dev; 1020 struct uio *uio; 1021 int iomode; 1022 { 1023 struct st_softc *st = stcd.cd_devs[STUNIT(dev)]; 1024 1025 return (physio(ststrategy, NULL, dev, B_READ, 1026 st->sc_link->adapter->scsi_minphys, uio)); 1027 } 1028 1029 int 1030 stwrite(dev, uio, iomode) 1031 dev_t dev; 1032 struct uio *uio; 1033 int iomode; 1034 { 1035 struct st_softc *st = stcd.cd_devs[STUNIT(dev)]; 1036 1037 return (physio(ststrategy, NULL, dev, B_WRITE, 1038 st->sc_link->adapter->scsi_minphys, uio)); 1039 } 1040 1041 /* 1042 * Perform special action on behalf of the user; 1043 * knows about the internals of this device 1044 */ 1045 int 1046 stioctl(dev, cmd, arg, flag, p) 1047 dev_t dev; 1048 u_long cmd; 1049 caddr_t arg; 1050 int flag; 1051 struct proc *p; 1052 { 1053 int error = 0; 1054 int unit; 1055 int number, nmarks, dsty; 1056 int flags; 1057 struct st_softc *st; 1058 int hold_blksize; 1059 u_int8_t hold_density; 1060 struct mtop *mt = (struct mtop *) arg; 1061 1062 /* 1063 * Find the device that the user is talking about 1064 */ 1065 flags = 0; /* give error messages, act on errors etc. */ 1066 unit = STUNIT(dev); 1067 dsty = STDSTY(dev); 1068 st = stcd.cd_devs[unit]; 1069 hold_blksize = st->blksize; 1070 hold_density = st->density; 1071 1072 switch (cmd) { 1073 1074 case MTIOCGET: { 1075 struct mtget *g = (struct mtget *) arg; 1076 1077 SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: get status]\n")); 1078 bzero(g, sizeof(struct mtget)); 1079 g->mt_type = 0x7; /* Ultrix compat *//*? */ 1080 g->mt_blksiz = st->blksize; 1081 g->mt_density = st->density; 1082 g->mt_mblksiz[0] = st->modes[0].blksize; 1083 g->mt_mblksiz[1] = st->modes[1].blksize; 1084 g->mt_mblksiz[2] = st->modes[2].blksize; 1085 g->mt_mblksiz[3] = st->modes[3].blksize; 1086 g->mt_mdensity[0] = st->modes[0].density; 1087 g->mt_mdensity[1] = st->modes[1].density; 1088 g->mt_mdensity[2] = st->modes[2].density; 1089 g->mt_mdensity[3] = st->modes[3].density; 1090 break; 1091 } 1092 case MTIOCTOP: { 1093 1094 SC_DEBUG(st->sc_link, SDEV_DB1, 1095 ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, mt->mt_count)); 1096 1097 /* compat: in U*x it is a short */ 1098 number = mt->mt_count; 1099 switch ((short) (mt->mt_op)) { 1100 case MTWEOF: /* write an end-of-file record */ 1101 error = st_write_filemarks(st, number, flags); 1102 break; 1103 case MTBSF: /* backward space file */ 1104 number = -number; 1105 case MTFSF: /* forward space file */ 1106 error = st_check_eod(st, FALSE, &nmarks, flags); 1107 if (!error) 1108 error = st_space(st, number - nmarks, 1109 SP_FILEMARKS, flags); 1110 break; 1111 case MTBSR: /* backward space record */ 1112 number = -number; 1113 case MTFSR: /* forward space record */ 1114 error = st_check_eod(st, TRUE, &nmarks, flags); 1115 if (!error) 1116 error = st_space(st, number, SP_BLKS, flags); 1117 break; 1118 case MTREW: /* rewind */ 1119 error = st_rewind(st, 0, flags); 1120 break; 1121 case MTOFFL: /* rewind and put the drive offline */ 1122 st_unmount(st, EJECT); 1123 break; 1124 case MTNOP: /* no operation, sets status only */ 1125 break; 1126 case MTRETEN: /* retension the tape */ 1127 error = st_load(st, LD_RETENSION, flags); 1128 if (!error) 1129 error = st_load(st, LD_LOAD, flags); 1130 break; 1131 case MTEOM: /* forward space to end of media */ 1132 error = st_check_eod(st, FALSE, &nmarks, flags); 1133 if (!error) 1134 error = st_space(st, 1, SP_EOM, flags); 1135 break; 1136 case MTCACHE: /* enable controller cache */ 1137 st->flags &= ~ST_DONTBUFFER; 1138 goto try_new_value; 1139 case MTNOCACHE: /* disable controller cache */ 1140 st->flags |= ST_DONTBUFFER; 1141 goto try_new_value; 1142 case MTERASE: /* erase volume */ 1143 error = st_erase(st, number, flags); 1144 break; 1145 case MTSETBSIZ: /* Set block size for device */ 1146 #ifdef NOTYET 1147 if (!(st->flags & ST_NEW_MOUNT)) { 1148 uprintf("re-mount tape before changing blocksize"); 1149 error = EINVAL; 1150 break; 1151 } 1152 #endif 1153 if (number == 0) { 1154 st->flags &= ~ST_FIXEDBLOCKS; 1155 } else { 1156 if ((st->blkmin || st->blkmax) && 1157 (number < st->blkmin || 1158 number > st->blkmax)) { 1159 error = EINVAL; 1160 break; 1161 } 1162 st->flags |= ST_FIXEDBLOCKS; 1163 } 1164 st->blksize = number; 1165 st->flags |= ST_BLOCK_SET; /*XXX */ 1166 goto try_new_value; 1167 1168 case MTSETDNSTY: /* Set density for device and mode */ 1169 if (number > SCSI_2_MAX_DENSITY_CODE) { 1170 error = EINVAL; 1171 break; 1172 } else 1173 st->density = number; 1174 goto try_new_value; 1175 1176 default: 1177 error = EINVAL; 1178 } 1179 break; 1180 } 1181 case MTIOCIEOT: 1182 case MTIOCEEOT: 1183 break; 1184 default: 1185 if (STMODE(dev) == CTLMODE) 1186 error = scsi_do_ioctl(st->sc_link, dev, cmd, arg, flag, p); 1187 else 1188 error = ENOTTY; 1189 break; 1190 } 1191 return error; 1192 /*-----------------------------*/ 1193 try_new_value: 1194 /* 1195 * Check that the mode being asked for is aggreeable to the 1196 * drive. If not, put it back the way it was. 1197 */ 1198 if ((error = st_mode_select(st, 0)) != 0) {/* put it back as it was */ 1199 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 1200 st->density = hold_density; 1201 st->blksize = hold_blksize; 1202 if (st->blksize) 1203 st->flags |= ST_FIXEDBLOCKS; 1204 else 1205 st->flags &= ~ST_FIXEDBLOCKS; 1206 return error; 1207 } 1208 /* 1209 * As the drive liked it, if we are setting a new default, 1210 * set it into the structures as such. 1211 * 1212 * The means for deciding this are not finalised yet 1213 */ 1214 if (STMODE(dev) == 0x03) { 1215 /* special mode */ 1216 /* XXX */ 1217 switch ((short) (mt->mt_op)) { 1218 case MTSETBSIZ: 1219 st->modes[dsty].blksize = st->blksize; 1220 st->modeflags[dsty] |= BLKSIZE_SET_BY_USER; 1221 break; 1222 case MTSETDNSTY: 1223 st->modes[dsty].density = st->density; 1224 st->modeflags[dsty] |= DENSITY_SET_BY_USER; 1225 break; 1226 } 1227 } 1228 return 0; 1229 } 1230 1231 /* 1232 * Do a synchronous read. 1233 */ 1234 int 1235 st_read(st, buf, size, flags) 1236 struct st_softc *st; 1237 int size; 1238 int flags; 1239 char *buf; 1240 { 1241 struct scsi_rw_tape cmd; 1242 1243 /* 1244 * If it's a null transfer, return immediatly 1245 */ 1246 if (size == 0) 1247 return 0; 1248 bzero(&cmd, sizeof(cmd)); 1249 cmd.opcode = READ; 1250 if (st->flags & ST_FIXEDBLOCKS) { 1251 cmd.byte2 |= SRW_FIXED; 1252 lto3b(size / (st->blksize ? st->blksize : DEF_FIXED_BSIZE), 1253 cmd.len); 1254 } else 1255 lto3b(size, cmd.len); 1256 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1257 sizeof(cmd), (u_char *) buf, size, 0, 100000, NULL, 1258 flags | SCSI_DATA_IN); 1259 } 1260 1261 #ifdef __STDC__ 1262 #define b2tol(a) (((unsigned)(a##_1) << 8) + (unsigned)a##_0) 1263 #else 1264 #define b2tol(a) (((unsigned)(a/**/_1) << 8) + (unsigned)a/**/_0) 1265 #endif 1266 1267 /* 1268 * Ask the drive what it's min and max blk sizes are. 1269 */ 1270 int 1271 st_read_block_limits(st, flags) 1272 struct st_softc *st; 1273 int flags; 1274 { 1275 struct scsi_block_limits cmd; 1276 struct scsi_block_limits_data block_limits; 1277 struct scsi_link *sc_link = st->sc_link; 1278 int error; 1279 1280 /* 1281 * First check if we have it all loaded 1282 */ 1283 if ((sc_link->flags & SDEV_MEDIA_LOADED)) 1284 return 0; 1285 1286 /* 1287 * do a 'Read Block Limits' 1288 */ 1289 bzero(&cmd, sizeof(cmd)); 1290 cmd.opcode = READ_BLOCK_LIMITS; 1291 1292 /* 1293 * do the command, update the global values 1294 */ 1295 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1296 sizeof(cmd), (u_char *) &block_limits, 1297 sizeof(block_limits), ST_RETRIES, 5000, 1298 NULL, flags | SCSI_DATA_IN); 1299 if (error) 1300 return error; 1301 1302 st->blkmin = b2tol(block_limits.min_length); 1303 st->blkmax = _3btol(&block_limits.max_length_2); 1304 1305 SC_DEBUG(sc_link, SDEV_DB3, 1306 ("(%d <= blksize <= %d)\n", st->blkmin, st->blkmax)); 1307 return 0; 1308 } 1309 1310 /* 1311 * Get the scsi driver to send a full inquiry to the 1312 * device and use the results to fill out the global 1313 * parameter structure. 1314 * 1315 * called from: 1316 * attach 1317 * open 1318 * ioctl (to reset original blksize) 1319 */ 1320 int 1321 st_mode_sense(st, flags) 1322 struct st_softc *st; 1323 int flags; 1324 { 1325 u_int scsi_sense_len; 1326 int error; 1327 struct scsi_mode_sense cmd; 1328 struct scsi_sense { 1329 struct scsi_mode_header header; 1330 struct scsi_blk_desc blk_desc; 1331 u_char sense_data[MAX_PAGE_0_SIZE]; 1332 } scsi_sense; 1333 struct scsi_link *sc_link = st->sc_link; 1334 1335 scsi_sense_len = 12 + st->page_0_size; 1336 1337 /* 1338 * Set up a mode sense 1339 */ 1340 bzero(&cmd, sizeof(cmd)); 1341 cmd.opcode = MODE_SENSE; 1342 cmd.length = scsi_sense_len; 1343 1344 /* 1345 * do the command, but we don't need the results 1346 * just print them for our interest's sake, if asked, 1347 * or if we need it as a template for the mode select 1348 * store it away. 1349 */ 1350 error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1351 sizeof(cmd), (u_char *) &scsi_sense, 1352 scsi_sense_len, ST_RETRIES, 5000, NULL, 1353 flags | SCSI_DATA_IN); 1354 if (error) 1355 return error; 1356 1357 st->numblks = _3btol(scsi_sense.blk_desc.nblocks); 1358 st->media_blksize = _3btol(scsi_sense.blk_desc.blklen); 1359 st->media_density = scsi_sense.blk_desc.density; 1360 if (scsi_sense.header.dev_spec & SMH_DSP_WRITE_PROT) 1361 st->flags |= ST_READONLY; 1362 SC_DEBUG(sc_link, SDEV_DB3, 1363 ("density code 0x%x, %d-byte blocks, write-%s, ", 1364 st->media_density, st->media_blksize, 1365 st->flags & ST_READONLY ? "protected" : "enabled")); 1366 SC_DEBUG(sc_link, SDEV_DB3, 1367 ("%sbuffered\n", 1368 scsi_sense.header.dev_spec & SMH_DSP_BUFF_MODE ? "" : "un")); 1369 if (st->page_0_size) 1370 bcopy(scsi_sense.sense_data, st->sense_data, st->page_0_size); 1371 sc_link->flags |= SDEV_MEDIA_LOADED; 1372 return 0; 1373 } 1374 1375 /* 1376 * Send a filled out parameter structure to the drive to 1377 * set it into the desire modes etc. 1378 */ 1379 int 1380 st_mode_select(st, flags) 1381 struct st_softc *st; 1382 int flags; 1383 { 1384 u_int scsi_select_len; 1385 struct scsi_mode_select cmd; 1386 struct scsi_select { 1387 struct scsi_mode_header header; 1388 struct scsi_blk_desc blk_desc; 1389 u_char sense_data[MAX_PAGE_0_SIZE]; 1390 } scsi_select; 1391 struct scsi_link *sc_link = st->sc_link; 1392 1393 scsi_select_len = 12 + st->page_0_size; 1394 1395 /* 1396 * Set up for a mode select 1397 */ 1398 bzero(&cmd, sizeof(cmd)); 1399 cmd.opcode = MODE_SELECT; 1400 cmd.length = scsi_select_len; 1401 1402 bzero(&scsi_select, scsi_select_len); 1403 scsi_select.header.blk_desc_len = sizeof(struct scsi_blk_desc); 1404 scsi_select.header.dev_spec &= ~SMH_DSP_BUFF_MODE; 1405 scsi_select.blk_desc.density = st->density; 1406 if (st->flags & ST_DONTBUFFER) 1407 scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_OFF; 1408 else 1409 scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_ON; 1410 if (st->flags & ST_FIXEDBLOCKS) 1411 lto3b(st->blksize, scsi_select.blk_desc.blklen); 1412 if (st->page_0_size) 1413 bcopy(st->sense_data, scsi_select.sense_data, st->page_0_size); 1414 1415 /* 1416 * do the command 1417 */ 1418 return scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1419 sizeof(cmd), (u_char *) &scsi_select, scsi_select_len, 1420 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_OUT); 1421 } 1422 1423 /* 1424 * issue an erase command 1425 */ 1426 int 1427 st_erase(st, full, flags) 1428 struct st_softc *st; 1429 int full, flags; 1430 { 1431 struct scsi_erase cmd; 1432 1433 /* 1434 * Full erase means set LONG bit in erase command, which asks 1435 * the drive to erase the entire unit. Without this bit, we're 1436 * asking the drive to write an erase gap. 1437 */ 1438 bzero(&cmd, sizeof(cmd)); 1439 cmd.opcode = ERASE; 1440 if (full) 1441 cmd.byte2 = SE_IMMED|SE_LONG; 1442 else 1443 cmd.byte2 = SE_IMMED; 1444 1445 /* 1446 * XXX We always do this asynchronously, for now. How long should 1447 * we wait if we want to (eventually) to it synchronously? 1448 */ 1449 return (scsi_scsi_cmd(st->sc_link, (struct scsi_generic *)&cmd, 1450 sizeof(cmd), 0, 0, ST_RETRIES, 5000, NULL, flags)); 1451 } 1452 1453 /* 1454 * skip N blocks/filemarks/seq filemarks/eom 1455 */ 1456 int 1457 st_space(st, number, what, flags) 1458 struct st_softc *st; 1459 u_int what; 1460 int flags; 1461 int number; 1462 { 1463 struct scsi_space cmd; 1464 int error; 1465 1466 switch (what) { 1467 case SP_BLKS: 1468 if (st->flags & ST_PER_ACTION) { 1469 if (number > 0) { 1470 st->flags &= ~ST_PER_ACTION; 1471 return EIO; 1472 } else if (number < 0) { 1473 if (st->flags & ST_AT_FILEMARK) { 1474 /* 1475 * Handling of ST_AT_FILEMARK 1476 * in st_space will fill in the 1477 * right file mark count. 1478 */ 1479 error = st_space(st, 0, SP_FILEMARKS, 1480 flags); 1481 if (error) 1482 return error; 1483 } 1484 if (st->flags & ST_BLANK_READ) { 1485 st->flags &= ~ST_BLANK_READ; 1486 return EIO; 1487 } 1488 st->flags &= ~ST_EIO_PENDING; 1489 } 1490 } 1491 break; 1492 case SP_FILEMARKS: 1493 if (st->flags & ST_EIO_PENDING) { 1494 if (number > 0) { 1495 /* pretend we just discovered the error */ 1496 st->flags &= ~ST_EIO_PENDING; 1497 return EIO; 1498 } else if (number < 0) { 1499 /* back away from the error */ 1500 st->flags &= ~ST_EIO_PENDING; 1501 } 1502 } 1503 if (st->flags & ST_AT_FILEMARK) { 1504 st->flags &= ~ST_AT_FILEMARK; 1505 number--; 1506 } 1507 if ((st->flags & ST_BLANK_READ) && (number < 0)) { 1508 /* back away from unwritten tape */ 1509 st->flags &= ~ST_BLANK_READ; 1510 number++; /* XXX dubious */ 1511 } 1512 break; 1513 case SP_EOM: 1514 if (st->flags & ST_EIO_PENDING) { 1515 /* pretend we just discovered the error */ 1516 st->flags &= ~ST_EIO_PENDING; 1517 return EIO; 1518 } 1519 if (st->flags & ST_AT_FILEMARK) 1520 st->flags &= ~ST_AT_FILEMARK; 1521 break; 1522 } 1523 if (number == 0) 1524 return 0; 1525 1526 bzero(&cmd, sizeof(cmd)); 1527 cmd.opcode = SPACE; 1528 cmd.byte2 = what; 1529 lto3b(number, cmd.number); 1530 1531 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1532 sizeof(cmd), 0, 0, 0, 900000, NULL, flags); 1533 } 1534 1535 /* 1536 * write N filemarks 1537 */ 1538 int 1539 st_write_filemarks(st, number, flags) 1540 struct st_softc *st; 1541 int flags; 1542 int number; 1543 { 1544 struct scsi_write_filemarks cmd; 1545 1546 /* 1547 * It's hard to write a negative number of file marks. 1548 * Don't try. 1549 */ 1550 if (number < 0) 1551 return EINVAL; 1552 switch (number) { 1553 case 0: /* really a command to sync the drive's buffers */ 1554 break; 1555 case 1: 1556 if (st->flags & ST_FM_WRITTEN) /* already have one down */ 1557 st->flags &= ~ST_WRITTEN; 1558 else 1559 st->flags |= ST_FM_WRITTEN; 1560 st->flags &= ~ST_PER_ACTION; 1561 break; 1562 default: 1563 st->flags &= ~(ST_PER_ACTION | ST_WRITTEN); 1564 } 1565 1566 bzero(&cmd, sizeof(cmd)); 1567 cmd.opcode = WRITE_FILEMARKS; 1568 lto3b(number, cmd.number); 1569 1570 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1571 sizeof(cmd), 0, 0, 0, 100000, NULL, flags); 1572 } 1573 1574 /* 1575 * Make sure the right number of file marks is on tape if the 1576 * tape has been written. If the position argument is true, 1577 * leave the tape positioned where it was originally. 1578 * 1579 * nmarks returns the number of marks to skip (or, if position 1580 * true, which were skipped) to get back original position. 1581 */ 1582 int 1583 st_check_eod(st, position, nmarks, flags) 1584 struct st_softc *st; 1585 boolean position; 1586 int *nmarks; 1587 int flags; 1588 { 1589 int error; 1590 1591 switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) { 1592 default: 1593 *nmarks = 0; 1594 return 0; 1595 case ST_WRITTEN: 1596 case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD: 1597 *nmarks = 1; 1598 break; 1599 case ST_WRITTEN | ST_2FM_AT_EOD: 1600 *nmarks = 2; 1601 } 1602 error = st_write_filemarks(st, *nmarks, flags); 1603 if (position && !error) 1604 error = st_space(st, -*nmarks, SP_FILEMARKS, flags); 1605 return error; 1606 } 1607 1608 /* 1609 * load/unload/retension 1610 */ 1611 int 1612 st_load(st, type, flags) 1613 struct st_softc *st; 1614 u_int type; 1615 int flags; 1616 { 1617 struct scsi_load cmd; 1618 1619 if (type != LD_LOAD) { 1620 int error; 1621 int nmarks; 1622 1623 error = st_check_eod(st, FALSE, &nmarks, flags); 1624 if (error) 1625 return error; 1626 } 1627 if (st->quirks & ST_Q_IGNORE_LOADS) 1628 return 0; 1629 1630 bzero(&cmd, sizeof(cmd)); 1631 cmd.opcode = LOAD; 1632 cmd.how = type; 1633 1634 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1635 sizeof(cmd), 0, 0, ST_RETRIES, 300000, NULL, flags); 1636 } 1637 1638 /* 1639 * Rewind the device 1640 */ 1641 int 1642 st_rewind(st, immediate, flags) 1643 struct st_softc *st; 1644 u_int immediate; 1645 int flags; 1646 { 1647 struct scsi_rewind cmd; 1648 int error; 1649 int nmarks; 1650 1651 error = st_check_eod(st, FALSE, &nmarks, flags); 1652 if (error) 1653 return error; 1654 st->flags &= ~ST_PER_ACTION; 1655 1656 bzero(&cmd, sizeof(cmd)); 1657 cmd.opcode = REWIND; 1658 cmd.byte2 = immediate; 1659 1660 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1661 sizeof(cmd), 0, 0, ST_RETRIES, immediate ? 5000 : 300000, NULL, 1662 flags); 1663 } 1664 1665 /* 1666 * Look at the returned sense and act on the error and detirmine 1667 * The unix error number to pass back... (0 = report no error) 1668 * (-1 = continue processing) 1669 */ 1670 int 1671 st_interpret_sense(xs) 1672 struct scsi_xfer *xs; 1673 { 1674 struct scsi_link *sc_link = xs->sc_link; 1675 struct scsi_sense_data *sense = &xs->sense; 1676 struct buf *bp = xs->bp; 1677 struct st_softc *st = sc_link->device_softc; 1678 u_int8_t key; 1679 int32_t info; 1680 1681 /* 1682 * Get the sense fields and work out what code 1683 */ 1684 if (sense->error_code & SSD_ERRCODE_VALID) { 1685 bcopy(sense->extended_info, &info, sizeof info); 1686 info = ntohl(info); 1687 } else 1688 info = xs->datalen; /* bad choice if fixed blocks */ 1689 if ((sense->error_code & SSD_ERRCODE) != 0x70) 1690 return -1; /* let the generic code handle it */ 1691 if (st->flags & ST_FIXEDBLOCKS) { 1692 xs->resid = info * st->blksize; 1693 if (sense->extended_flags & SSD_EOM) { 1694 st->flags |= ST_EIO_PENDING; 1695 if (bp) 1696 bp->b_resid = xs->resid; 1697 } 1698 if (sense->extended_flags & SSD_FILEMARK) { 1699 st->flags |= ST_AT_FILEMARK; 1700 if (bp) 1701 bp->b_resid = xs->resid; 1702 } 1703 if (sense->extended_flags & SSD_ILI) { 1704 st->flags |= ST_EIO_PENDING; 1705 if (bp) 1706 bp->b_resid = xs->resid; 1707 if (sense->error_code & SSD_ERRCODE_VALID && 1708 (xs->flags & SCSI_SILENT) == 0) 1709 printf("%s: block wrong size, %d blocks residual\n", 1710 st->sc_dev.dv_xname, info); 1711 1712 /* 1713 * This quirk code helps the drive read 1714 * the first tape block, regardless of 1715 * format. That is required for these 1716 * drives to return proper MODE SENSE 1717 * information. 1718 */ 1719 if ((st->quirks & ST_Q_SENSE_HELP) && 1720 !(sc_link->flags & SDEV_MEDIA_LOADED)) 1721 st->blksize -= 512; 1722 } 1723 /* 1724 * If no data was tranfered, do it immediatly 1725 */ 1726 if (xs->resid >= xs->datalen) { 1727 if (st->flags & ST_EIO_PENDING) 1728 return EIO; 1729 if (st->flags & ST_AT_FILEMARK) { 1730 if (bp) 1731 bp->b_resid = xs->resid; 1732 return 0; 1733 } 1734 } 1735 } else { /* must be variable mode */ 1736 xs->resid = xs->datalen; /* to be sure */ 1737 if (sense->extended_flags & SSD_EOM) 1738 return EIO; 1739 if (sense->extended_flags & SSD_FILEMARK) { 1740 if (bp) 1741 bp->b_resid = bp->b_bcount; 1742 return 0; 1743 } 1744 if (sense->extended_flags & SSD_ILI) { 1745 if (info < 0) { 1746 /* 1747 * the record was bigger than the read 1748 */ 1749 if ((xs->flags & SCSI_SILENT) == 0) 1750 printf("%s: %d-byte record too big\n", 1751 st->sc_dev.dv_xname, 1752 xs->datalen - info); 1753 return EIO; 1754 } 1755 xs->resid = info; 1756 if (bp) 1757 bp->b_resid = info; 1758 } 1759 } 1760 key = sense->extended_flags & SSD_KEY; 1761 1762 if (key == 0x8) { 1763 /* 1764 * This quirk code helps the drive read the 1765 * first tape block, regardless of format. That 1766 * is required for these drives to return proper 1767 * MODE SENSE information. 1768 */ 1769 if ((st->quirks & ST_Q_SENSE_HELP) && 1770 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 1771 /* still starting */ 1772 st->blksize -= 512; 1773 } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) { 1774 st->flags |= ST_BLANK_READ; 1775 xs->resid = xs->datalen; 1776 if (bp) { 1777 bp->b_resid = xs->resid; 1778 /* return an EOF */ 1779 } 1780 return 0; 1781 } 1782 } 1783 return -1; /* let the default/generic handler handle it */ 1784 } 1785 1786 /* 1787 * The quirk here is that the drive returns some value to st_mode_sense 1788 * incorrectly until the tape has actually passed by the head. 1789 * 1790 * The method is to set the drive to large fixed-block state (user-specified 1791 * density and 1024-byte blocks), then read and rewind to get it to sense the 1792 * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't 1793 * work, as a last resort, try variable- length blocks. The result will be 1794 * the ability to do an accurate st_mode_sense. 1795 * 1796 * We know we can do a rewind because we just did a load, which implies rewind. 1797 * Rewind seems preferable to space backward if we have a virgin tape. 1798 * 1799 * The rest of the code for this quirk is in ILI processing and BLANK CHECK 1800 * error processing, both part of st_interpret_sense. 1801 */ 1802 int 1803 st_touch_tape(st) 1804 struct st_softc *st; 1805 { 1806 char *buf; 1807 int readsize; 1808 int error; 1809 1810 buf = malloc(1024, M_TEMP, M_NOWAIT); 1811 if (!buf) 1812 return ENOMEM; 1813 1814 if ((error = st_mode_sense(st, 0)) != 0) 1815 goto bad; 1816 st->blksize = 1024; 1817 do { 1818 switch (st->blksize) { 1819 case 512: 1820 case 1024: 1821 readsize = st->blksize; 1822 st->flags |= ST_FIXEDBLOCKS; 1823 break; 1824 default: 1825 readsize = 1; 1826 st->flags &= ~ST_FIXEDBLOCKS; 1827 } 1828 if ((error = st_mode_select(st, 0)) != 0) 1829 goto bad; 1830 st_read(st, buf, readsize, SCSI_SILENT); /* XXX */ 1831 if ((error = st_rewind(st, 0, 0)) != 0) { 1832 bad: free(buf, M_TEMP); 1833 return error; 1834 } 1835 } while (readsize != 1 && readsize > st->blksize); 1836 1837 free(buf, M_TEMP); 1838 return 0; 1839 } 1840 1841 int 1842 stdump(dev, blkno, va, size) 1843 dev_t dev; 1844 daddr_t blkno; 1845 caddr_t va; 1846 size_t size; 1847 { 1848 1849 /* Not implemented. */ 1850 return ENXIO; 1851 } 1852
Indexes created Tue Sep 23 02:09:52 GMT 2025