1 /* $NetBSD: st.c,v 1.43 1994/11/22 00:14:24 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Charles Hannum. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Charles Hannum. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Originally written by Julian Elischer (julian@tfs.com) 34 * for TRW Financial Systems for use under the MACH(2.5) operating system. 35 * 36 * TRW Financial Systems, in accordance with their agreement with Carnegie 37 * Mellon University, makes this software available to CMU to distribute 38 * or use in any manner that they see fit as long as this message is kept with 39 * the software. For this reason TFS also grants any other persons or 40 * organisations permission to use or modify this software. 41 * 42 * TFS supplies this software to be publicly redistributed 43 * on the understanding that TFS is not responsible for the correct 44 * functioning of this software in any circumstances. 45 * 46 * Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992 47 * major changes by Julian Elischer (julian@jules.dialix.oz.au) May 1993 48 */ 49 50 /* 51 * To do: 52 * work out some better way of guessing what a good timeout is going 53 * to be depending on whether we expect to retension or not. 54 */ 55 56 #include <sys/types.h> 57 #include <sys/param.h> 58 #include <sys/systm.h> 59 #include <sys/fcntl.h> 60 #include <sys/errno.h> 61 #include <sys/ioctl.h> 62 #include <sys/malloc.h> 63 #include <sys/buf.h> 64 #include <sys/proc.h> 65 #include <sys/user.h> 66 #include <sys/mtio.h> 67 #include <sys/device.h> 68 69 #include <scsi/scsi_all.h> 70 #include <scsi/scsi_tape.h> 71 #include <scsi/scsiconf.h> 72 73 /* Defines for device specific stuff */ 74 #define DEF_FIXED_BSIZE 512 75 #define ST_RETRIES 4 /* only on non IO commands */ 76 77 #define STMODE(z) ( minor(z) & 0x03) 78 #define STDSTY(z) ((minor(z) >> 2) & 0x03) 79 #define STUNIT(z) ((minor(z) >> 4) ) 80 #define CTLMODE 3 81 82 #define SCSI_2_MAX_DENSITY_CODE 0x17 /* maximum density code specified 83 * in SCSI II spec. */ 84 /* 85 * Define various devices that we know mis-behave in some way, 86 * and note how they are bad, so we can correct for them 87 */ 88 struct modes { 89 u_int blksiz; 90 u_int quirks; /* same definitions as in rogues */ 91 char density; 92 char spare[3]; 93 }; 94 95 struct rogues { 96 char *manu; 97 char *model; 98 char *version; 99 u_int quirks; /* valid for all modes */ 100 u_int page_0_size; 101 #define MAX_PAGE_0_SIZE 64 102 struct modes modes[4]; 103 }; 104 105 /* define behaviour codes (quirks) */ 106 #define ST_Q_FORCE_FIXED_MODE 0x00002 107 #define ST_Q_FORCE_VAR_MODE 0x00004 108 #define ST_Q_SENSE_HELP 0x00008 /* must do READ for good MODE SENSE */ 109 #define ST_Q_IGNORE_LOADS 0x00010 110 #define ST_Q_BLKSIZ 0x00020 /* variable-block media_blksiz > 0 */ 111 112 static struct rogues gallery[] = /* ends with an all-null entry */ 113 { 114 {"pre-scsi", " unknown model ", "????", 115 0, 0, 116 { 117 {512, ST_Q_FORCE_FIXED_MODE, 0}, /* minor 0-3 */ 118 {512, ST_Q_FORCE_FIXED_MODE, QIC_24}, /* minor 4-7 */ 119 {0, ST_Q_FORCE_VAR_MODE, HALFINCH_1600}, /* minor 8-11 */ 120 {0, ST_Q_FORCE_VAR_MODE, HALFINCH_6250} /* minor 12-15 */ 121 } 122 }, 123 {"TANDBERG", " TDC 3600", "????", 124 0, 12, 125 { 126 {0, 0, 0}, /* minor 0-3 */ 127 {0, ST_Q_FORCE_VAR_MODE, QIC_525}, /* minor 4-7 */ 128 {0, 0, QIC_150}, /* minor 8-11 */ 129 {0, 0, QIC_120} /* minor 12-15 */ 130 } 131 }, 132 /* 133 * At least -005 and -007 need this. I'll assume they all do unless I 134 * hear otherwise. - mycroft, 31MAR1994 135 */ 136 {"ARCHIVE ", "VIPER 2525 25462", "????", 137 0, 0, 138 { 139 {0, ST_Q_SENSE_HELP, 0}, /* minor 0-3 */ 140 {0, ST_Q_SENSE_HELP, QIC_525}, /* minor 4-7 */ 141 {0, 0, QIC_150}, /* minor 8-11 */ 142 {0, 0, QIC_120} /* minor 12-15 */ 143 } 144 }, 145 /* 146 * One user reports that this works for his tape drive. It probably 147 * needs more work. - mycroft, 09APR1994 148 */ 149 {"SANKYO ", "CP525", "????", 150 0, 0, 151 { 152 {512, ST_Q_FORCE_FIXED_MODE, 0}, /* minor 0-3 */ 153 {512, ST_Q_FORCE_FIXED_MODE, QIC_525}, /* minor 4-7 */ 154 {0, 0, QIC_150}, /* minor 8-11 */ 155 {0, 0, QIC_120} /* minor 12-15 */ 156 } 157 }, 158 {"ARCHIVE ", "VIPER 150", "????", 159 0, 12, 160 { 161 {0, 0, 0}, /* minor 0-3 */ 162 {0, 0, QIC_150}, /* minor 4-7 */ 163 {0, 0, QIC_120}, /* minor 8-11 */ 164 {0, 0, QIC_24} /* minor 12-15 */ 165 } 166 }, 167 {"WANGTEK ", "5525ES SCSI REV7", "????", 168 0, 0, 169 { 170 {0, 0, 0}, /* minor 0-3 */ 171 {0, ST_Q_BLKSIZ, QIC_525}, /* minor 4-7 */ 172 {0, 0, QIC_150}, /* minor 8-11 */ 173 {0, 0, QIC_120} /* minor 12-15 */ 174 } 175 }, 176 {"WangDAT ", "Model 1300", "????", 177 0, 0, 178 { 179 {0, 0, 0}, /* minor 0-3 */ 180 {512, ST_Q_FORCE_FIXED_MODE, DDS}, /* minor 4-7 */ 181 {1024, ST_Q_FORCE_FIXED_MODE, DDS}, /* minor 8-11 */ 182 {0, ST_Q_FORCE_VAR_MODE, DDS} /* minor 12-15 */ 183 } 184 }, 185 #if 0 186 {"EXABYTE ", "EXB-8200", "????", 187 0, 5, 188 { 189 {0, 0, 0}, /* minor 0-3 */ 190 {0, 0, 0}, /* minor 4-7 */ 191 {0, 0, 0}, /* minor 8-11 */ 192 {0, 0, 0} /* minor 12-15 */ 193 } 194 }, 195 #endif 196 {0} 197 }; 198 199 #define NOEJECT 0 200 #define EJECT 1 201 202 struct st_data { 203 struct device sc_dev; 204 /*--------------------present operating parameters, flags etc.----------------*/ 205 int flags; /* see below */ 206 u_int blksiz; /* blksiz we are using */ 207 u_int density; /* present density */ 208 u_int quirks; /* quirks for the open mode */ 209 u_int page_0_size; /* size of page 0 data */ 210 u_int last_dsty; /* last density openned */ 211 /*--------------------device/scsi parameters----------------------------------*/ 212 struct scsi_link *sc_link; /* our link to the adpter etc. */ 213 /*--------------------parameters reported by the device ----------------------*/ 214 u_int blkmin; /* min blk size */ 215 u_int blkmax; /* max blk size */ 216 struct rogues *rogues; /* if we have a rogue entry */ 217 /*--------------------parameters reported by the device for this media--------*/ 218 u_int numblks; /* nominal blocks capacity */ 219 u_int media_blksiz; /* 0 if not ST_FIXEDBLOCKS */ 220 u_int media_density; /* this is what it said when asked */ 221 /*--------------------quirks for the whole drive------------------------------*/ 222 u_int drive_quirks; /* quirks of this drive */ 223 /*--------------------How we should set up when openning each minor device----*/ 224 struct modes modes[4]; /* plus more for each mode */ 225 u_int8 modeflags[4]; /* flags for the modes */ 226 #define DENSITY_SET_BY_USER 0x01 227 #define DENSITY_SET_BY_QUIRK 0x02 228 #define BLKSIZE_SET_BY_USER 0x04 229 #define BLKSIZE_SET_BY_QUIRK 0x08 230 /*--------------------storage for sense data returned by the drive------------*/ 231 u_char sense_data[MAX_PAGE_0_SIZE]; /* 232 * additional sense data needed 233 * for mode sense/select. 234 */ 235 struct buf buf_queue; /* the queue of pending IO operations */ 236 struct scsi_xfer scsi_xfer; /* scsi xfer struct for this drive */ 237 u_int xfer_block_wait; /* is a process waiting? */ 238 }; 239 240 void stattach __P((struct device *, struct device *, void *)); 241 242 struct cfdriver stcd = { 243 NULL, "st", scsi_targmatch, stattach, DV_TAPE, sizeof(struct st_data) 244 }; 245 246 int st_space __P((struct st_data *, int number, u_int what, int flags)); 247 int st_rewind __P((struct st_data *, u_int immediate, int flags)); 248 int st_mode_sense __P((struct st_data *, int flags)); 249 int st_decide_mode __P((struct st_data *, boolean first_read)); 250 int st_read_block_limits __P((struct st_data *, int flags)); 251 int st_touch_tape __P((struct st_data *)); 252 int st_write_filemarks __P((struct st_data *, int number, int flags)); 253 int st_load __P((struct st_data *, u_int type, int flags)); 254 int st_mode_select __P((struct st_data *, int flags)); 255 void ststrategy(); 256 void stminphys(); 257 int st_check_eod(); 258 void ststart(); 259 void st_unmount(); 260 int st_mount_tape(); 261 void st_loadquirks(); 262 void st_identify_drive(); 263 int st_interpret_sense(); 264 265 struct scsi_device st_switch = { 266 st_interpret_sense, 267 ststart, 268 NULL, 269 NULL, 270 "st", 271 0 272 }; 273 274 #define ST_INFO_VALID 0x0001 275 #define ST_BLOCK_SET 0x0002 /* block size, mode set by ioctl */ 276 #define ST_WRITTEN 0x0004 /* data have been written, EOD needed */ 277 #define ST_FIXEDBLOCKS 0x0008 278 #define ST_AT_FILEMARK 0x0010 279 #define ST_EIO_PENDING 0x0020 /* we couldn't report it then (had data) */ 280 #define ST_NEW_MOUNT 0x0040 /* still need to decide mode */ 281 #define ST_READONLY 0x0080 /* st_mode_sense says write protected */ 282 #define ST_FM_WRITTEN 0x0100 /* 283 * EOF file mark written -- used with 284 * ~ST_WRITTEN to indicate that multiple file 285 * marks have been written 286 */ 287 #define ST_BLANK_READ 0x0200 /* BLANK CHECK encountered already */ 288 #define ST_2FM_AT_EOD 0x0400 /* write 2 file marks at EOD */ 289 #define ST_MOUNTED 0x0800 /* Device is presently mounted */ 290 291 #define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ) 292 #define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \ 293 ST_FIXEDBLOCKS | ST_READONLY | \ 294 ST_FM_WRITTEN | ST_2FM_AT_EOD | ST_PER_ACTION) 295 296 /* 297 * The routine called by the low level scsi routine when it discovers 298 * A device suitable for this driver 299 */ 300 void 301 stattach(parent, self, aux) 302 struct device *parent, *self; 303 void *aux; 304 { 305 struct st_data *st = (void *)self; 306 struct scsi_link *sc_link = aux; 307 308 SC_DEBUG(sc_link, SDEV_DB2, ("stattach: ")); 309 310 sc_link->device = &st_switch; 311 sc_link->device_softc = st; 312 313 /* 314 * Store information needed to contact our base driver 315 */ 316 st->sc_link = sc_link; 317 318 /* 319 * Check if the drive is a known criminal and take 320 * Any steps needed to bring it into line 321 */ 322 st_identify_drive(st); 323 324 /* 325 * Use the subdriver to request information regarding 326 * the drive. We cannot use interrupts yet, so the 327 * request must specify this. 328 */ 329 printf(": %s", st->rogues ? "rogue, " : ""); 330 if (st_mode_sense(st, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT)) 331 printf("drive offline\n"); 332 else if (scsi_test_unit_ready(sc_link, 333 SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT)) 334 printf("drive empty\n"); 335 else { 336 printf("density code 0x%x, ", st->media_density); 337 if (st->media_blksiz) 338 printf("%d-byte", st->media_blksiz); 339 else 340 printf("variable"); 341 printf(" blocks, write-%s\n", 342 (st->flags & ST_READONLY) ? "protected" : "enabled"); 343 } 344 345 /* 346 * Set up the buf queue for this device 347 */ 348 st->buf_queue.b_active = 0; 349 st->buf_queue.b_actf = 0; 350 st->buf_queue.b_actb = &st->buf_queue.b_actf; 351 } 352 353 /* 354 * Use the inquiry routine in 'scsi_base' to get drive info so we can 355 * Further tailor our behaviour. 356 */ 357 void 358 st_identify_drive(st) 359 struct st_data *st; 360 { 361 struct scsi_inquiry_data inqbuf; 362 struct rogues *finger; 363 char manu[32]; 364 char model[32]; 365 char model2[32]; 366 char version[32]; 367 u_int model_len; 368 369 /* 370 * Get the device type information 371 */ 372 if (scsi_inquire(st->sc_link, &inqbuf, 373 SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT) != 0) { 374 printf("%s: couldn't get device type, using default\n", 375 st->sc_dev.dv_xname); 376 return; 377 } 378 if ((inqbuf.version & SID_ANSII) == 0) { 379 /* 380 * If not advanced enough, use default values 381 */ 382 strncpy(manu, "pre-scsi", 8); 383 manu[8] = 0; 384 strncpy(model, " unknown model ", 16); 385 model[16] = 0; 386 strncpy(version, "????", 4); 387 version[4] = 0; 388 } else { 389 strncpy(manu, inqbuf.vendor, 8); 390 manu[8] = 0; 391 strncpy(model, inqbuf.product, 16); 392 model[16] = 0; 393 strncpy(version, inqbuf.revision, 4); 394 version[4] = 0; 395 } 396 397 /* 398 * Load the parameters for this kind of device, so we 399 * treat it as appropriate for each operating mode. 400 * Only check the number of characters in the array's 401 * model entry, not the entire model string returned. 402 */ 403 finger = gallery; 404 while (finger->manu) { 405 model_len = 0; 406 while (finger->model[model_len] && (model_len < 32)) { 407 model2[model_len] = model[model_len]; 408 model_len++; 409 } 410 model2[model_len] = 0; 411 if ((strcmp(manu, finger->manu) == 0) && 412 (strcmp(model2, finger->model) == 0 || 413 strcmp("????????????????", finger->model) == 0) && 414 (strcmp(version, finger->version) == 0 || 415 strcmp("????", finger->version) == 0)) { 416 st->rogues = finger; 417 st->drive_quirks = finger->quirks; 418 st->quirks = finger->quirks; /* start value */ 419 st->page_0_size = finger->page_0_size; 420 st_loadquirks(st); 421 break; 422 } else 423 finger++; /* go to next suspect */ 424 } 425 } 426 427 /* 428 * initialise the subdevices to the default (QUIRK) state. 429 * this will remove any setting made by the system operator or previous 430 * operations. 431 */ 432 void 433 st_loadquirks(st) 434 struct st_data *st; 435 { 436 int i; 437 struct modes *mode; 438 struct modes *mode2; 439 440 if (!st->rogues) 441 return; 442 mode = st->rogues->modes; 443 mode2 = st->modes; 444 for (i = 0; i < 4; i++) { 445 bzero(mode2, sizeof(struct modes)); 446 st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK | 447 DENSITY_SET_BY_QUIRK | BLKSIZE_SET_BY_USER | 448 DENSITY_SET_BY_USER); 449 if (mode->blksiz && ((mode->quirks | st->drive_quirks) & 450 ST_Q_FORCE_FIXED_MODE)) { 451 mode2->blksiz = mode->blksiz; 452 st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK; 453 } else if ((mode->quirks | st->drive_quirks) & 454 ST_Q_FORCE_VAR_MODE) { 455 mode2->blksiz = 0; 456 st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK; 457 } 458 if (mode->density) { 459 mode2->density = mode->density; 460 st->modeflags[i] |= DENSITY_SET_BY_QUIRK; 461 } 462 mode++; 463 mode2++; 464 } 465 } 466 467 /* 468 * open the device. 469 */ 470 int 471 stopen(dev, flags) 472 dev_t dev; 473 int flags; 474 { 475 int unit; 476 u_int mode, dsty; 477 int error = 0; 478 struct st_data *st; 479 struct scsi_link *sc_link; 480 481 unit = STUNIT(dev); 482 if (unit >= stcd.cd_ndevs) 483 return ENXIO; 484 st = stcd.cd_devs[unit]; 485 if (!st) 486 return ENXIO; 487 488 mode = STMODE(dev); 489 dsty = STDSTY(dev); 490 sc_link = st->sc_link; 491 492 SC_DEBUG(sc_link, SDEV_DB1, ("open: dev=0x%x (unit %d (of %d))\n", dev, 493 unit, stcd.cd_ndevs)); 494 495 /* 496 * Only allow one at a time 497 */ 498 if (sc_link->flags & SDEV_OPEN) { 499 printf("%s: already open\n", st->sc_dev.dv_xname); 500 return EBUSY; 501 } 502 503 /* 504 * Catch any unit attention errors. 505 */ 506 scsi_test_unit_ready(sc_link, SCSI_SILENT); 507 508 sc_link->flags |= SDEV_OPEN; /* unit attn are now errors */ 509 510 /* 511 * If the mode is 3 (e.g. minor = 3,7,11,15) 512 * then the device has been openned to set defaults 513 * This mode does NOT ALLOW I/O, only ioctls 514 */ 515 if (mode == CTLMODE) 516 return 0; 517 518 /* 519 * Check that the device is ready to use (media loaded?) 520 * This time take notice of the return result 521 */ 522 if (scsi_test_unit_ready(sc_link, 0)) { 523 SC_DEBUG(sc_link, SDEV_DB3, ("device not responding\n")); 524 st_unmount(st, NOEJECT); 525 error = EIO; 526 goto bad; 527 } 528 529 /* 530 * if it's a different mode, or if the media has been 531 * invalidated, unmount the tape from the previous 532 * session but continue with open processing 533 */ 534 if (st->last_dsty != dsty || !(sc_link->flags & SDEV_MEDIA_LOADED)) 535 st_unmount(st, NOEJECT); 536 537 /* 538 * If we are not mounted, then we should start a new 539 * mount session. 540 */ 541 if (!(st->flags & ST_MOUNTED)) { 542 st_mount_tape(dev, flags); 543 st->last_dsty = dsty; 544 } 545 546 /* 547 * Make sure that a tape opened in write-only mode will have 548 * file marks written on it when closed, even if not written to. 549 * This is for SUN compatibility 550 */ 551 if ((flags & O_ACCMODE) == FWRITE) 552 st->flags |= ST_WRITTEN; 553 554 SC_DEBUG(sc_link, SDEV_DB2, ("open complete\n")); 555 return 0; 556 557 bad: 558 sc_link->flags &= ~SDEV_OPEN; 559 return error; 560 } 561 562 /* 563 * close the device.. only called if we are the LAST 564 * occurence of an open device 565 */ 566 int 567 stclose(dev) 568 dev_t dev; 569 { 570 struct st_data *st = stcd.cd_devs[STUNIT(dev)]; 571 572 SC_DEBUG(st->sc_link, SDEV_DB1, ("closing\n")); 573 if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) 574 st_write_filemarks(st, 1, 0); 575 switch (STMODE(dev)) { 576 case 0: 577 case 3: /* for now */ 578 st_unmount(st, NOEJECT); 579 break; 580 case 1: 581 /* leave mounted unless media seems to have been removed */ 582 if (!(st->sc_link->flags & SDEV_MEDIA_LOADED)) 583 st_unmount(st, NOEJECT); 584 break; 585 case 2: 586 st_unmount(st, EJECT); 587 break; 588 } 589 st->sc_link->flags &= ~SDEV_OPEN; 590 591 return 0; 592 } 593 594 /* 595 * Start a new mount session. 596 * Copy in all the default parameters from the selected device mode. 597 * and try guess any that seem to be defaulted. 598 */ 599 int 600 st_mount_tape(dev, flags) 601 dev_t dev; 602 int flags; 603 { 604 int unit; 605 u_int mode, dsty; 606 struct st_data *st; 607 struct scsi_link *sc_link; 608 int error = 0; 609 610 unit = STUNIT(dev); 611 mode = STMODE(dev); 612 dsty = STDSTY(dev); 613 st = stcd.cd_devs[unit]; 614 sc_link = st->sc_link; 615 616 if (st->flags & ST_MOUNTED) 617 return 0; 618 619 SC_DEBUG(sc_link, SDEV_DB1, ("mounting\n ")); 620 st->flags |= ST_NEW_MOUNT; 621 st->quirks = st->drive_quirks | st->modes[dsty].quirks; 622 /* 623 * If the media is new, then make sure we give it a chance to 624 * to do a 'load' instruction. (We assume it is new.) 625 */ 626 if (error = st_load(st, LD_LOAD, 0)) 627 return error; 628 /* 629 * Throw another dummy instruction to catch 630 * 'Unit attention' errors. Some drives appear to give 631 * these after doing a Load instruction. 632 * (noteably some DAT drives) 633 */ 634 scsi_test_unit_ready(sc_link, SCSI_SILENT); 635 636 /* 637 * Some devices can't tell you much until they have been 638 * asked to look at the media. This quirk does this. 639 */ 640 if (st->quirks & ST_Q_SENSE_HELP) 641 if (error = st_touch_tape(st)) 642 return error; 643 /* 644 * Load the physical device parameters 645 * loads: blkmin, blkmax 646 */ 647 if (error = st_read_block_limits(st, 0)) 648 return error; 649 /* 650 * Load the media dependent parameters 651 * includes: media_blksiz,media_density,numblks 652 * As we have a tape in, it should be reflected here. 653 * If not you may need the "quirk" above. 654 */ 655 if (error = st_mode_sense(st, 0)) 656 return error; 657 /* 658 * If we have gained a permanent density from somewhere, 659 * then use it in preference to the one supplied by 660 * default by the driver. 661 */ 662 if (st->modeflags[dsty] & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER)) 663 st->density = st->modes[dsty].density; 664 else 665 st->density = st->media_density; 666 /* 667 * If we have gained a permanent blocksize 668 * then use it in preference to the one supplied by 669 * default by the driver. 670 */ 671 st->flags &= ~ST_FIXEDBLOCKS; 672 if (st->modeflags[dsty] & (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) { 673 st->blksiz = st->modes[dsty].blksiz; 674 if (st->blksiz) 675 st->flags |= ST_FIXEDBLOCKS; 676 } else { 677 if (error = st_decide_mode(st, FALSE)) 678 return error; 679 } 680 if (error = st_mode_select(st, 0)) { 681 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 682 return error; 683 } 684 scsi_prevent(sc_link, PR_PREVENT, 0); /* who cares if it fails? */ 685 st->flags &= ~ST_NEW_MOUNT; 686 st->flags |= ST_MOUNTED; 687 sc_link->flags |= SDEV_MEDIA_LOADED; /* move earlier? */ 688 689 return 0; 690 } 691 692 /* 693 * End the present mount session. 694 * Rewind, and optionally eject the tape. 695 * Reset various flags to indicate that all new 696 * operations require another mount operation 697 */ 698 void 699 st_unmount(st, eject) 700 struct st_data *st; 701 boolean eject; 702 { 703 struct scsi_link *sc_link = st->sc_link; 704 int nmarks; 705 706 if (!(st->flags & ST_MOUNTED)) 707 return; 708 SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n")); 709 st_check_eod(st, FALSE, &nmarks, SCSI_SILENT); 710 st_rewind(st, 0, SCSI_SILENT); 711 scsi_prevent(sc_link, PR_ALLOW, SCSI_SILENT); 712 if (eject) 713 st_load(st, LD_UNLOAD, SCSI_SILENT); 714 st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT); 715 sc_link->flags &= ~SDEV_MEDIA_LOADED; 716 } 717 718 /* 719 * Given all we know about the device, media, mode, 'quirks' and 720 * initial operation, make a decision as to how we should be set 721 * to run (regarding blocking and EOD marks) 722 */ 723 int 724 st_decide_mode(st, first_read) 725 struct st_data *st; 726 boolean first_read; 727 { 728 #ifdef SCSIDEBUG 729 struct scsi_link *sc_link = st->sc_link; 730 #endif 731 732 SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n")); 733 734 /* 735 * If the user hasn't already specified fixed or variable-length 736 * blocks and the block size (zero if variable-length), we'll 737 * have to try to figure them out ourselves. 738 * 739 * Our first shot at a method is, "The quirks made me do it!" 740 */ 741 switch (st->quirks & (ST_Q_FORCE_FIXED_MODE | ST_Q_FORCE_VAR_MODE)) { 742 case (ST_Q_FORCE_FIXED_MODE | ST_Q_FORCE_VAR_MODE): 743 printf("%s: bad quirks\n", st->sc_dev.dv_xname); 744 return EINVAL; 745 case ST_Q_FORCE_FIXED_MODE: /*specified fixed, but not what size */ 746 st->flags |= ST_FIXEDBLOCKS; 747 if (st->blkmin && (st->blkmin == st->blkmax)) 748 st->blksiz = st->blkmin; 749 else if (st->media_blksiz > 0) 750 st->blksiz = st->media_blksiz; 751 else 752 st->blksiz = DEF_FIXED_BSIZE; 753 SC_DEBUG(sc_link, SDEV_DB3, ("Quirks force fixed mode(%d)\n", 754 st->blksiz)); 755 goto done; 756 case ST_Q_FORCE_VAR_MODE: 757 st->flags &= ~ST_FIXEDBLOCKS; 758 st->blksiz = 0; 759 SC_DEBUG(sc_link, SDEV_DB3, ("Quirks force variable mode\n")); 760 goto done; 761 } 762 763 /* 764 * If the drive can only handle fixed-length blocks and only at 765 * one size, perhaps we should just do that. 766 */ 767 if (st->blkmin && (st->blkmin == st->blkmax)) { 768 st->flags |= ST_FIXEDBLOCKS; 769 st->blksiz = st->blkmin; 770 SC_DEBUG(sc_link, SDEV_DB3, 771 ("blkmin == blkmax of %d\n", st->blkmin)); 772 goto done; 773 } 774 /* 775 * If the tape density mandates (or even suggests) use of fixed 776 * or variable-length blocks, comply. 777 */ 778 switch (st->density) { 779 case HALFINCH_800: 780 case HALFINCH_1600: 781 case HALFINCH_6250: 782 case DDS: 783 st->flags &= ~ST_FIXEDBLOCKS; 784 st->blksiz = 0; 785 SC_DEBUG(sc_link, SDEV_DB3, ("density specified variable\n")); 786 goto done; 787 case QIC_11: 788 case QIC_24: 789 case QIC_120: 790 case QIC_150: 791 case QIC_525: 792 case QIC_1320: 793 st->flags |= ST_FIXEDBLOCKS; 794 if (st->media_blksiz > 0) 795 st->blksiz = st->media_blksiz; 796 else 797 st->blksiz = DEF_FIXED_BSIZE; 798 SC_DEBUG(sc_link, SDEV_DB3, ("density specified fixed\n")); 799 goto done; 800 } 801 /* 802 * If we're about to read the tape, perhaps we should choose 803 * fixed or variable-length blocks and block size according to 804 * what the drive found on the tape. 805 */ 806 if (first_read && 807 (!(st->quirks & ST_Q_BLKSIZ) || (st->media_blksiz == 0) || 808 (st->media_blksiz == DEF_FIXED_BSIZE) || 809 (st->media_blksiz == 1024))) { 810 if (st->media_blksiz == 0) 811 st->flags &= ~ST_FIXEDBLOCKS; 812 else 813 st->flags |= ST_FIXEDBLOCKS; 814 st->blksiz = st->media_blksiz; 815 SC_DEBUG(sc_link, SDEV_DB3, 816 ("Used media_blksiz of %d\n", st->media_blksiz)); 817 goto done; 818 } 819 /* 820 * We're getting no hints from any direction. Choose variable- 821 * length blocks arbitrarily. 822 */ 823 st->flags &= ~ST_FIXEDBLOCKS; 824 st->blksiz = 0; 825 SC_DEBUG(sc_link, SDEV_DB3, 826 ("Give up and default to variable mode\n")); 827 done: 828 829 /* 830 * Decide whether or not to write two file marks to signify end- 831 * of-data. Make the decision as a function of density. If 832 * the decision is not to use a second file mark, the SCSI BLANK 833 * CHECK condition code will be recognized as end-of-data when 834 * first read. 835 * (I think this should be a by-product of fixed/variable..julian) 836 */ 837 switch (st->density) { 838 /* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ 839 case QIC_11: 840 case QIC_24: 841 case QIC_120: 842 case QIC_150: 843 case QIC_525: 844 case QIC_1320: 845 st->flags &= ~ST_2FM_AT_EOD; 846 break; 847 default: 848 st->flags |= ST_2FM_AT_EOD; 849 } 850 return 0; 851 } 852 853 /* 854 * trim the size of the transfer if needed, 855 * called by physio 856 * basically the smaller of our min and the scsi driver's 857 * minphys 858 */ 859 void 860 stminphys(bp) 861 struct buf *bp; 862 { 863 register struct st_data *st = stcd.cd_devs[STUNIT(bp->b_dev)]; 864 865 (st->sc_link->adapter->scsi_minphys) (bp); 866 } 867 868 /* 869 * Actually translate the requested transfer into 870 * one the physical driver can understand 871 * The transfer is described by a buf and will include 872 * only one physical transfer. 873 */ 874 void 875 ststrategy(bp) 876 struct buf *bp; 877 { 878 struct st_data *st = stcd.cd_devs[STUNIT(bp->b_dev)]; 879 struct buf *dp; 880 int opri; 881 882 SC_DEBUG(st->sc_link, SDEV_DB1, 883 ("ststrategy %d bytes @ blk %d\n", bp->b_bcount, bp->b_blkno)); 884 /* 885 * If it's a null transfer, return immediatly 886 */ 887 if (bp->b_bcount == 0) 888 goto done; 889 /* 890 * Odd sized request on fixed drives are verboten 891 */ 892 if (st->flags & ST_FIXEDBLOCKS) { 893 if (bp->b_bcount % st->blksiz) { 894 printf("%s: bad request, must be multiple of %d\n", 895 st->sc_dev.dv_xname, st->blksiz); 896 bp->b_error = EIO; 897 goto bad; 898 } 899 } 900 /* 901 * as are out-of-range requests on variable drives. 902 */ 903 else if (bp->b_bcount < st->blkmin || 904 (st->blkmax && bp->b_bcount > st->blkmax)) { 905 printf("%s: bad request, must be between %d and %d\n", 906 st->sc_dev.dv_xname, st->blkmin, st->blkmax); 907 bp->b_error = EIO; 908 goto bad; 909 } 910 stminphys(bp); 911 opri = splbio(); 912 913 /* 914 * Place it in the queue of activities for this tape 915 * at the end (a bit silly because we only have on user.. 916 * (but it could fork())) 917 */ 918 dp = &st->buf_queue; 919 bp->b_actf = NULL; 920 bp->b_actb = dp->b_actb; 921 *dp->b_actb = bp; 922 dp->b_actb = &bp->b_actf; 923 924 /* 925 * Tell the device to get going on the transfer if it's 926 * not doing anything, otherwise just wait for completion 927 * (All a bit silly if we're only allowing 1 open but..) 928 */ 929 ststart(st); 930 931 splx(opri); 932 return; 933 bad: 934 bp->b_flags |= B_ERROR; 935 done: 936 /* 937 * Correctly set the buf to indicate a completed xfer 938 */ 939 iodone(bp); 940 return; 941 } 942 943 /* 944 * ststart looks to see if there is a buf waiting for the device 945 * and that the device is not already busy. If both are true, 946 * It dequeues the buf and creates a scsi command to perform the 947 * transfer required. The transfer request will call scsi_done 948 * on completion, which will in turn call this routine again 949 * so that the next queued transfer is performed. 950 * The bufs are queued by the strategy routine (ststrategy) 951 * 952 * This routine is also called after other non-queued requests 953 * have been made of the scsi driver, to ensure that the queue 954 * continues to be drained. 955 * ststart() is called at splbio 956 */ 957 void 958 ststart(st) 959 struct st_data *st; 960 { 961 struct scsi_link *sc_link = st->sc_link; 962 register struct buf *bp, *dp; 963 struct scsi_rw_tape cmd; 964 int flags; 965 966 SC_DEBUG(sc_link, SDEV_DB2, ("ststart ")); 967 /* 968 * See if there is a buf to do and we are not already 969 * doing one 970 */ 971 while (sc_link->opennings) { 972 /* if a special awaits, let it proceed first */ 973 if (sc_link->flags & SDEV_WAITING) { 974 sc_link->flags &= ~SDEV_WAITING; 975 wakeup((caddr_t)sc_link); 976 return; 977 } 978 979 bp = st->buf_queue.b_actf; 980 if (!bp) 981 return; /* no work to bother with */ 982 if (dp = bp->b_actf) 983 dp->b_actb = bp->b_actb; 984 else 985 st->buf_queue.b_actb = bp->b_actb; 986 *bp->b_actb = dp; 987 988 /* 989 * if the device has been unmounted byt the user 990 * then throw away all requests until done 991 */ 992 if (!(st->flags & ST_MOUNTED) || 993 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 994 /* make sure that one implies the other.. */ 995 sc_link->flags &= ~SDEV_MEDIA_LOADED; 996 bp->b_flags |= B_ERROR; 997 bp->b_error = EIO; 998 biodone(bp); 999 continue; 1000 } 1001 /* 1002 * only FIXEDBLOCK devices have pending operations 1003 */ 1004 if (st->flags & ST_FIXEDBLOCKS) { 1005 /* 1006 * If we are at a filemark but have not reported it yet 1007 * then we should report it now 1008 */ 1009 if (st->flags & ST_AT_FILEMARK) { 1010 if ((bp->b_flags & B_READ) == B_WRITE) { 1011 /* 1012 * Handling of ST_AT_FILEMARK in 1013 * st_space will fill in the right file 1014 * mark count. 1015 * Back up over filemark 1016 */ 1017 if (st_space(st, 0, SP_FILEMARKS, 0)) { 1018 bp->b_flags |= B_ERROR; 1019 bp->b_error = EIO; 1020 biodone(bp); 1021 continue; 1022 } 1023 } else { 1024 bp->b_resid = bp->b_bcount; 1025 bp->b_error = 0; 1026 bp->b_flags &= ~B_ERROR; 1027 st->flags &= ~ST_AT_FILEMARK; 1028 biodone(bp); 1029 continue; /* seek more work */ 1030 } 1031 } 1032 /* 1033 * If we are at EIO (e.g. EOM) but have not reported it 1034 * yet then we should report it now 1035 */ 1036 if (st->flags & ST_EIO_PENDING) { 1037 bp->b_resid = bp->b_bcount; 1038 bp->b_error = EIO; 1039 bp->b_flags |= B_ERROR; 1040 st->flags &= ~ST_EIO_PENDING; 1041 biodone(bp); 1042 continue; /* seek more work */ 1043 } 1044 } 1045 1046 /* 1047 * Fill out the scsi command 1048 */ 1049 bzero(&cmd, sizeof(cmd)); 1050 if ((bp->b_flags & B_READ) == B_WRITE) { 1051 cmd.op_code = WRITE; 1052 st->flags &= ~ST_FM_WRITTEN; 1053 st->flags |= ST_WRITTEN; 1054 flags = SCSI_DATA_OUT; 1055 } else { 1056 cmd.op_code = READ; 1057 flags = SCSI_DATA_IN; 1058 } 1059 1060 /* 1061 * Handle "fixed-block-mode" tape drives by using the 1062 * block count instead of the length. 1063 */ 1064 if (st->flags & ST_FIXEDBLOCKS) { 1065 cmd.byte2 |= SRW_FIXED; 1066 lto3b(bp->b_bcount / st->blksiz, cmd.len); 1067 } else 1068 lto3b(bp->b_bcount, cmd.len); 1069 1070 /* 1071 * go ask the adapter to do all this for us 1072 */ 1073 if (scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1074 sizeof(cmd), (u_char *) bp->b_data, bp->b_bcount, 0, 1075 100000, bp, flags | SCSI_NOSLEEP) != SUCCESSFULLY_QUEUED) 1076 printf("%s: not queued\n", st->sc_dev.dv_xname); 1077 } /* go back and see if we can cram more work in.. */ 1078 } 1079 1080 /* 1081 * Perform special action on behalf of the user; 1082 * knows about the internals of this device 1083 */ 1084 int 1085 stioctl(dev, cmd, arg, flag) 1086 dev_t dev; 1087 u_long cmd; 1088 caddr_t arg; 1089 int flag; 1090 { 1091 int error = 0; 1092 int unit; 1093 int number, nmarks, dsty; 1094 int flags; 1095 struct st_data *st; 1096 u_int hold_blksiz; 1097 u_int hold_density; 1098 struct mtop *mt = (struct mtop *) arg; 1099 1100 /* 1101 * Find the device that the user is talking about 1102 */ 1103 flags = 0; /* give error messages, act on errors etc. */ 1104 unit = STUNIT(dev); 1105 dsty = STDSTY(dev); 1106 st = stcd.cd_devs[unit]; 1107 hold_blksiz = st->blksiz; 1108 hold_density = st->density; 1109 1110 switch (cmd) { 1111 1112 case MTIOCGET: { 1113 struct mtget *g = (struct mtget *) arg; 1114 1115 SC_DEBUG(st->sc_link, SDEV_DB1, ("[ioctl: get status]\n")); 1116 bzero(g, sizeof(struct mtget)); 1117 g->mt_type = 0x7; /* Ultrix compat *//*? */ 1118 g->mt_blksiz = st->blksiz; 1119 g->mt_density = st->density; 1120 g->mt_mblksiz[0] = st->modes[0].blksiz; 1121 g->mt_mblksiz[1] = st->modes[1].blksiz; 1122 g->mt_mblksiz[2] = st->modes[2].blksiz; 1123 g->mt_mblksiz[3] = st->modes[3].blksiz; 1124 g->mt_mdensity[0] = st->modes[0].density; 1125 g->mt_mdensity[1] = st->modes[1].density; 1126 g->mt_mdensity[2] = st->modes[2].density; 1127 g->mt_mdensity[3] = st->modes[3].density; 1128 break; 1129 } 1130 case MTIOCTOP: { 1131 1132 SC_DEBUG(st->sc_link, SDEV_DB1, 1133 ("[ioctl: op=0x%x count=0x%x]\n", mt->mt_op, mt->mt_count)); 1134 1135 /* compat: in U*x it is a short */ 1136 number = mt->mt_count; 1137 switch ((short) (mt->mt_op)) { 1138 case MTWEOF: /* write an end-of-file record */ 1139 error = st_write_filemarks(st, number, flags); 1140 break; 1141 case MTBSF: /* backward space file */ 1142 number = -number; 1143 case MTFSF: /* forward space file */ 1144 error = st_check_eod(st, FALSE, &nmarks, flags); 1145 if (!error) 1146 error = st_space(st, number - nmarks, 1147 SP_FILEMARKS, flags); 1148 break; 1149 case MTBSR: /* backward space record */ 1150 number = -number; 1151 case MTFSR: /* forward space record */ 1152 error = st_check_eod(st, TRUE, &nmarks, flags); 1153 if (!error) 1154 error = st_space(st, number, SP_BLKS, flags); 1155 break; 1156 case MTREW: /* rewind */ 1157 error = st_rewind(st, 0, flags); 1158 break; 1159 case MTOFFL: /* rewind and put the drive offline */ 1160 st_unmount(st, EJECT); 1161 break; 1162 case MTNOP: /* no operation, sets status only */ 1163 break; 1164 case MTRETEN: /* retension the tape */ 1165 error = st_load(st, LD_RETENSION, flags); 1166 if (!error) 1167 error = st_load(st, LD_LOAD, flags); 1168 break; 1169 case MTEOM: /* forward space to end of media */ 1170 error = st_check_eod(st, FALSE, &nmarks, flags); 1171 if (!error) 1172 error = st_space(st, 1, SP_EOM, flags); 1173 break; 1174 case MTCACHE: /* enable controller cache */ 1175 case MTNOCACHE: /* disable controller cache */ 1176 break; 1177 case MTSETBSIZ: /* Set block size for device */ 1178 #ifdef NOTYET 1179 if (!(st->flags & ST_NEW_MOUNT)) { 1180 uprintf("re-mount tape before changing blocksize"); 1181 error = EINVAL; 1182 break; 1183 } 1184 #endif 1185 if (number == 0) { 1186 st->flags &= ~ST_FIXEDBLOCKS; 1187 } else { 1188 if ((st->blkmin || st->blkmax) && 1189 (number < st->blkmin || 1190 number > st->blkmax)) { 1191 error = EINVAL; 1192 break; 1193 } 1194 st->flags |= ST_FIXEDBLOCKS; 1195 } 1196 st->blksiz = number; 1197 st->flags |= ST_BLOCK_SET; /*XXX */ 1198 goto try_new_value; 1199 1200 case MTSETDNSTY: /* Set density for device and mode */ 1201 if (number > SCSI_2_MAX_DENSITY_CODE) 1202 error = EINVAL; 1203 else 1204 st->density = number; 1205 goto try_new_value; 1206 1207 default: 1208 error = EINVAL; 1209 } 1210 break; 1211 } 1212 case MTIOCIEOT: 1213 case MTIOCEEOT: 1214 break; 1215 default: 1216 if (STMODE(dev) == CTLMODE) 1217 error = scsi_do_ioctl(st->sc_link, dev, cmd, arg, flag); 1218 else 1219 error = ENOTTY; 1220 break; 1221 } 1222 return error; 1223 /*-----------------------------*/ 1224 try_new_value: 1225 /* 1226 * Check that the mode being asked for is aggreeable to the 1227 * drive. If not, put it back the way it was. 1228 */ 1229 if (error = st_mode_select(st, 0)) { /* put it back as it was */ 1230 printf("%s: cannot set selected mode\n", st->sc_dev.dv_xname); 1231 st->density = hold_density; 1232 st->blksiz = hold_blksiz; 1233 if (st->blksiz) 1234 st->flags |= ST_FIXEDBLOCKS; 1235 else 1236 st->flags &= ~ST_FIXEDBLOCKS; 1237 return error; 1238 } 1239 /* 1240 * As the drive liked it, if we are setting a new default, 1241 * set it into the structures as such. 1242 * 1243 * The means for deciding this are not finalised yet 1244 */ 1245 if (STMODE(dev) == 0x03) { 1246 /* special mode */ 1247 /* XXX */ 1248 switch ((short) (mt->mt_op)) { 1249 case MTSETBSIZ: 1250 st->modes[dsty].blksiz = st->blksiz; 1251 st->modeflags[dsty] |= BLKSIZE_SET_BY_USER; 1252 break; 1253 case MTSETDNSTY: 1254 st->modes[dsty].density = st->density; 1255 st->modeflags[dsty] |= DENSITY_SET_BY_USER; 1256 break; 1257 } 1258 } 1259 return 0; 1260 } 1261 1262 /* 1263 * Do a synchronous read. 1264 */ 1265 int 1266 st_read(st, buf, size, flags) 1267 struct st_data *st; 1268 u_int size; 1269 int flags; 1270 char *buf; 1271 { 1272 struct scsi_rw_tape cmd; 1273 1274 /* 1275 * If it's a null transfer, return immediatly 1276 */ 1277 if (size == 0) 1278 return 0; 1279 bzero(&cmd, sizeof(cmd)); 1280 cmd.op_code = READ; 1281 if (st->flags & ST_FIXEDBLOCKS) { 1282 cmd.byte2 |= SRW_FIXED; 1283 lto3b(size / (st->blksiz ? st->blksiz : DEF_FIXED_BSIZE), 1284 cmd.len); 1285 } else 1286 lto3b(size, cmd.len); 1287 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1288 sizeof(cmd), (u_char *) buf, size, 0, 100000, NULL, 1289 flags | SCSI_DATA_IN); 1290 } 1291 1292 #ifdef __STDC__ 1293 #define b2tol(a) (((unsigned)(a##_1) << 8) + (unsigned)a##_0) 1294 #else 1295 #define b2tol(a) (((unsigned)(a/**/_1) << 8) + (unsigned)a/**/_0) 1296 #endif 1297 1298 /* 1299 * Ask the drive what it's min and max blk sizes are. 1300 */ 1301 int 1302 st_read_block_limits(st, flags) 1303 struct st_data *st; 1304 int flags; 1305 { 1306 struct scsi_block_limits cmd; 1307 struct scsi_block_limits_data block_limits; 1308 struct scsi_link *sc_link = st->sc_link; 1309 int error; 1310 1311 /* 1312 * First check if we have it all loaded 1313 */ 1314 if ((sc_link->flags & SDEV_MEDIA_LOADED)) 1315 return 0; 1316 1317 /* 1318 * do a 'Read Block Limits' 1319 */ 1320 bzero(&cmd, sizeof(cmd)); 1321 cmd.op_code = READ_BLOCK_LIMITS; 1322 1323 /* 1324 * do the command, update the global values 1325 */ 1326 if (error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1327 sizeof(cmd), (u_char *) &block_limits, sizeof(block_limits), 1328 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN)) 1329 return error; 1330 1331 st->blkmin = b2tol(block_limits.min_length); 1332 st->blkmax = _3btol(&block_limits.max_length_2); 1333 1334 SC_DEBUG(sc_link, SDEV_DB3, 1335 ("(%d <= blksiz <= %d)\n", st->blkmin, st->blkmax)); 1336 return 0; 1337 } 1338 1339 /* 1340 * Get the scsi driver to send a full inquiry to the 1341 * device and use the results to fill out the global 1342 * parameter structure. 1343 * 1344 * called from: 1345 * attach 1346 * open 1347 * ioctl (to reset original blksize) 1348 */ 1349 int 1350 st_mode_sense(st, flags) 1351 struct st_data *st; 1352 int flags; 1353 { 1354 u_int scsi_sense_len; 1355 int error; 1356 struct scsi_mode_sense cmd; 1357 struct scsi_sense { 1358 struct scsi_mode_header header; 1359 struct blk_desc blk_desc; 1360 u_char sense_data[MAX_PAGE_0_SIZE]; 1361 } scsi_sense; 1362 struct scsi_link *sc_link = st->sc_link; 1363 1364 scsi_sense_len = 12 + st->page_0_size; 1365 1366 /* 1367 * Set up a mode sense 1368 */ 1369 bzero(&cmd, sizeof(cmd)); 1370 cmd.op_code = MODE_SENSE; 1371 cmd.length = scsi_sense_len; 1372 1373 /* 1374 * do the command, but we don't need the results 1375 * just print them for our interest's sake, if asked, 1376 * or if we need it as a template for the mode select 1377 * store it away. 1378 */ 1379 if (error = scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1380 sizeof(cmd), (u_char *) &scsi_sense, scsi_sense_len, 1381 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_IN)) 1382 return error; 1383 1384 st->numblks = _3btol(scsi_sense.blk_desc.nblocks); 1385 st->media_blksiz = _3btol(scsi_sense.blk_desc.blklen); 1386 st->media_density = scsi_sense.blk_desc.density; 1387 if (scsi_sense.header.dev_spec & SMH_DSP_WRITE_PROT) 1388 st->flags |= ST_READONLY; 1389 SC_DEBUG(sc_link, SDEV_DB3, 1390 ("density code 0x%x, %d-byte blocks, write-%s, ", 1391 st->media_density, st->media_blksiz, 1392 st->flags & ST_READONLY ? "protected" : "enabled")); 1393 SC_DEBUG(sc_link, SDEV_DB3, 1394 ("%sbuffered\n", 1395 scsi_sense.header.dev_spec & SMH_DSP_BUFF_MODE ? "" : "un")); 1396 if (st->page_0_size) 1397 bcopy(scsi_sense.sense_data, st->sense_data, st->page_0_size); 1398 sc_link->flags |= SDEV_MEDIA_LOADED; 1399 return 0; 1400 } 1401 1402 /* 1403 * Send a filled out parameter structure to the drive to 1404 * set it into the desire modes etc. 1405 */ 1406 int 1407 st_mode_select(st, flags) 1408 struct st_data *st; 1409 int flags; 1410 { 1411 u_int scsi_select_len; 1412 int error; 1413 struct scsi_mode_select cmd; 1414 struct scsi_select { 1415 struct scsi_mode_header header; 1416 struct blk_desc blk_desc; 1417 u_char sense_data[MAX_PAGE_0_SIZE]; 1418 } scsi_select; 1419 struct scsi_link *sc_link = st->sc_link; 1420 1421 scsi_select_len = 12 + st->page_0_size; 1422 1423 /* 1424 * Set up for a mode select 1425 */ 1426 bzero(&cmd, sizeof(cmd)); 1427 cmd.op_code = MODE_SELECT; 1428 cmd.length = scsi_select_len; 1429 1430 bzero(&scsi_select, scsi_select_len); 1431 scsi_select.header.blk_desc_len = sizeof(struct blk_desc); 1432 scsi_select.header.dev_spec |= SMH_DSP_BUFF_MODE_ON; 1433 scsi_select.blk_desc.density = st->density; 1434 if (st->flags & ST_FIXEDBLOCKS) 1435 lto3b(st->blksiz, scsi_select.blk_desc.blklen); 1436 if (st->page_0_size) 1437 bcopy(st->sense_data, scsi_select.sense_data, st->page_0_size); 1438 1439 /* 1440 * do the command 1441 */ 1442 return scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, 1443 sizeof(cmd), (u_char *) &scsi_select, scsi_select_len, 1444 ST_RETRIES, 5000, NULL, flags | SCSI_DATA_OUT); 1445 } 1446 1447 /* 1448 * skip N blocks/filemarks/seq filemarks/eom 1449 */ 1450 int 1451 st_space(st, number, what, flags) 1452 struct st_data *st; 1453 u_int what; 1454 int flags; 1455 int number; 1456 { 1457 struct scsi_space cmd; 1458 int error; 1459 1460 switch (what) { 1461 case SP_BLKS: 1462 if (st->flags & ST_PER_ACTION) { 1463 if (number > 0) { 1464 st->flags &= ~ST_PER_ACTION; 1465 return EIO; 1466 } else if (number < 0) { 1467 if (st->flags & ST_AT_FILEMARK) { 1468 /* 1469 * Handling of ST_AT_FILEMARK 1470 * in st_space will fill in the 1471 * right file mark count. 1472 */ 1473 error = st_space(st, 0, SP_FILEMARKS, 1474 flags); 1475 if (error) 1476 return error; 1477 } 1478 if (st->flags & ST_BLANK_READ) { 1479 st->flags &= ~ST_BLANK_READ; 1480 return EIO; 1481 } 1482 st->flags &= ~ST_EIO_PENDING; 1483 } 1484 } 1485 break; 1486 case SP_FILEMARKS: 1487 if (st->flags & ST_EIO_PENDING) { 1488 if (number > 0) { 1489 /* pretend we just discovered the error */ 1490 st->flags &= ~ST_EIO_PENDING; 1491 return EIO; 1492 } else if (number < 0) { 1493 /* back away from the error */ 1494 st->flags &= ~ST_EIO_PENDING; 1495 } 1496 } 1497 if (st->flags & ST_AT_FILEMARK) { 1498 st->flags &= ~ST_AT_FILEMARK; 1499 number--; 1500 } 1501 if ((st->flags & ST_BLANK_READ) && (number < 0)) { 1502 /* back away from unwritten tape */ 1503 st->flags &= ~ST_BLANK_READ; 1504 number++; /* XXX dubious */ 1505 } 1506 break; 1507 case SP_EOM: 1508 if (st->flags & ST_EIO_PENDING) { 1509 /* pretend we just discovered the error */ 1510 st->flags &= ~ST_EIO_PENDING; 1511 return EIO; 1512 } 1513 if (st->flags & ST_AT_FILEMARK) 1514 st->flags &= ~ST_AT_FILEMARK; 1515 break; 1516 } 1517 if (number == 0) 1518 return 0; 1519 1520 bzero(&cmd, sizeof(cmd)); 1521 cmd.op_code = SPACE; 1522 cmd.byte2 = what; 1523 lto3b(number, cmd.number); 1524 1525 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1526 sizeof(cmd), 0, 0, 0, 600000, NULL, flags); 1527 } 1528 1529 /* 1530 * write N filemarks 1531 */ 1532 int 1533 st_write_filemarks(st, number, flags) 1534 struct st_data *st; 1535 int flags; 1536 int number; 1537 { 1538 struct scsi_write_filemarks cmd; 1539 1540 /* 1541 * It's hard to write a negative number of file marks. 1542 * Don't try. 1543 */ 1544 if (number < 0) 1545 return EINVAL; 1546 switch (number) { 1547 case 0: /* really a command to sync the drive's buffers */ 1548 break; 1549 case 1: 1550 if (st->flags & ST_FM_WRITTEN) /* already have one down */ 1551 st->flags &= ~ST_WRITTEN; 1552 else 1553 st->flags |= ST_FM_WRITTEN; 1554 st->flags &= ~ST_PER_ACTION; 1555 break; 1556 default: 1557 st->flags &= ~(ST_PER_ACTION | ST_WRITTEN); 1558 } 1559 1560 bzero(&cmd, sizeof(cmd)); 1561 cmd.op_code = WRITE_FILEMARKS; 1562 lto3b(number, cmd.number); 1563 1564 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1565 sizeof(cmd), 0, 0, 0, 100000, NULL, flags); 1566 } 1567 1568 /* 1569 * Make sure the right number of file marks is on tape if the 1570 * tape has been written. If the position argument is true, 1571 * leave the tape positioned where it was originally. 1572 * 1573 * nmarks returns the number of marks to skip (or, if position 1574 * true, which were skipped) to get back original position. 1575 */ 1576 int 1577 st_check_eod(st, position, nmarks, flags) 1578 struct st_data *st; 1579 boolean position; 1580 int *nmarks; 1581 int flags; 1582 { 1583 int error; 1584 1585 switch (st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD)) { 1586 default: 1587 *nmarks = 0; 1588 return 0; 1589 case ST_WRITTEN: 1590 case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD: 1591 *nmarks = 1; 1592 break; 1593 case ST_WRITTEN | ST_2FM_AT_EOD: 1594 *nmarks = 2; 1595 } 1596 error = st_write_filemarks(st, *nmarks, flags); 1597 if (position && !error) 1598 error = st_space(st, -*nmarks, SP_FILEMARKS, flags); 1599 return error; 1600 } 1601 1602 /* 1603 * load/unload/retension 1604 */ 1605 int 1606 st_load(st, type, flags) 1607 struct st_data *st; 1608 u_int type; 1609 int flags; 1610 { 1611 struct scsi_load cmd; 1612 1613 if (type != LD_LOAD) { 1614 int error; 1615 int nmarks; 1616 1617 error = st_check_eod(st, FALSE, &nmarks, flags); 1618 if (error) 1619 return error; 1620 } 1621 if (st->quirks & ST_Q_IGNORE_LOADS) 1622 return 0; 1623 1624 bzero(&cmd, sizeof(cmd)); 1625 cmd.op_code = LOAD; 1626 cmd.how = type; 1627 1628 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1629 sizeof(cmd), 0, 0, ST_RETRIES, 300000, NULL, flags); 1630 } 1631 1632 /* 1633 * Rewind the device 1634 */ 1635 int 1636 st_rewind(st, immediate, flags) 1637 struct st_data *st; 1638 u_int immediate; 1639 int flags; 1640 { 1641 struct scsi_rewind cmd; 1642 int error; 1643 int nmarks; 1644 1645 error = st_check_eod(st, FALSE, &nmarks, flags); 1646 if (error) 1647 return error; 1648 st->flags &= ~ST_PER_ACTION; 1649 1650 bzero(&cmd, sizeof(cmd)); 1651 cmd.op_code = REWIND; 1652 cmd.byte2 = immediate; 1653 1654 return scsi_scsi_cmd(st->sc_link, (struct scsi_generic *) &cmd, 1655 sizeof(cmd), 0, 0, ST_RETRIES, immediate ? 5000 : 300000, NULL, 1656 flags); 1657 } 1658 1659 /* 1660 * Look at the returned sense and act on the error and detirmine 1661 * The unix error number to pass back... (0 = report no error) 1662 * (-1 = continue processing) 1663 */ 1664 int 1665 st_interpret_sense(xs) 1666 struct scsi_xfer *xs; 1667 { 1668 struct scsi_link *sc_link = xs->sc_link; 1669 struct scsi_sense_data *sense = &xs->sense; 1670 boolean silent = xs->flags & SCSI_SILENT; 1671 struct buf *bp = xs->bp; 1672 struct st_data *st = sc_link->device_softc; 1673 u_int key; 1674 int info; 1675 1676 /* 1677 * Get the sense fields and work out what code 1678 */ 1679 if (sense->error_code & SSD_ERRCODE_VALID) { 1680 bcopy(sense->extended_info, &info, sizeof info); 1681 info = ntohl(info); 1682 } else 1683 info = xs->datalen; /* bad choice if fixed blocks */ 1684 if ((sense->error_code & SSD_ERRCODE) != 0x70) 1685 return -1; /* let the generic code handle it */ 1686 if (st->flags & ST_FIXEDBLOCKS) { 1687 xs->resid = info * st->blksiz; 1688 if (sense->extended_flags & SSD_EOM) { 1689 st->flags |= ST_EIO_PENDING; 1690 if (bp) 1691 bp->b_resid = xs->resid; 1692 } 1693 if (sense->extended_flags & SSD_FILEMARK) { 1694 st->flags |= ST_AT_FILEMARK; 1695 if (bp) 1696 bp->b_resid = xs->resid; 1697 } 1698 if (sense->extended_flags & SSD_ILI) { 1699 st->flags |= ST_EIO_PENDING; 1700 if (bp) 1701 bp->b_resid = xs->resid; 1702 if (sense->error_code & SSD_ERRCODE_VALID && !silent) 1703 printf("%s: block wrong size, %d blocks residual\n", 1704 st->sc_dev.dv_xname, info); 1705 1706 /* 1707 * This quirk code helps the drive read 1708 * the first tape block, regardless of 1709 * format. That is required for these 1710 * drives to return proper MODE SENSE 1711 * information. 1712 */ 1713 if ((st->quirks & ST_Q_SENSE_HELP) && 1714 !(sc_link->flags & SDEV_MEDIA_LOADED)) 1715 st->blksiz -= 512; 1716 } 1717 /* 1718 * If no data was tranfered, do it immediatly 1719 */ 1720 if (xs->resid >= xs->datalen) { 1721 if (st->flags & ST_EIO_PENDING) 1722 return EIO; 1723 if (st->flags & ST_AT_FILEMARK) { 1724 if (bp) 1725 bp->b_resid = xs->resid; 1726 return 0; 1727 } 1728 } 1729 } else { /* must be variable mode */ 1730 xs->resid = xs->datalen; /* to be sure */ 1731 if (sense->extended_flags & SSD_EOM) 1732 return EIO; 1733 if (sense->extended_flags & SSD_FILEMARK) { 1734 if (bp) 1735 bp->b_resid = bp->b_bcount; 1736 return 0; 1737 } 1738 if (sense->extended_flags & SSD_ILI) { 1739 if (info < 0) { 1740 /* 1741 * the record was bigger than the read 1742 */ 1743 if (!silent) 1744 printf("%s: %d-byte record too big\n", 1745 st->sc_dev.dv_xname, 1746 xs->datalen - info); 1747 return EIO; 1748 } 1749 xs->resid = info; 1750 if (bp) 1751 bp->b_resid = info; 1752 } 1753 } 1754 key = sense->extended_flags & SSD_KEY; 1755 1756 if (key == 0x8) { 1757 /* 1758 * This quirk code helps the drive read the 1759 * first tape block, regardless of format. That 1760 * is required for these drives to return proper 1761 * MODE SENSE information. 1762 */ 1763 if ((st->quirks & ST_Q_SENSE_HELP) && 1764 !(sc_link->flags & SDEV_MEDIA_LOADED)) { 1765 /* still starting */ 1766 st->blksiz -= 512; 1767 } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) { 1768 st->flags |= ST_BLANK_READ; 1769 xs->resid = xs->datalen; 1770 if (bp) { 1771 bp->b_resid = xs->resid; 1772 /* return an EOF */ 1773 } 1774 return 0; 1775 } 1776 } 1777 return -1; /* let the default/generic handler handle it */ 1778 } 1779 1780 /* 1781 * The quirk here is that the drive returns some value to st_mode_sense 1782 * incorrectly until the tape has actually passed by the head. 1783 * 1784 * The method is to set the drive to large fixed-block state (user-specified 1785 * density and 1024-byte blocks), then read and rewind to get it to sense the 1786 * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't 1787 * work, as a last resort, try variable- length blocks. The result will be 1788 * the ability to do an accurate st_mode_sense. 1789 * 1790 * We know we can do a rewind because we just did a load, which implies rewind. 1791 * Rewind seems preferable to space backward if we have a virgin tape. 1792 * 1793 * The rest of the code for this quirk is in ILI processing and BLANK CHECK 1794 * error processing, both part of st_interpret_sense. 1795 */ 1796 int 1797 st_touch_tape(st) 1798 struct st_data *st; 1799 { 1800 char *buf; 1801 u_int readsiz; 1802 int error; 1803 1804 buf = malloc(1024, M_TEMP, M_NOWAIT); 1805 if (!buf) 1806 return ENOMEM; 1807 1808 if (error = st_mode_sense(st, 0)) 1809 goto bad; 1810 st->blksiz = 1024; 1811 do { 1812 switch (st->blksiz) { 1813 case 512: 1814 case 1024: 1815 readsiz = st->blksiz; 1816 st->flags |= ST_FIXEDBLOCKS; 1817 break; 1818 default: 1819 readsiz = 1; 1820 st->flags &= ~ST_FIXEDBLOCKS; 1821 } 1822 if (error = st_mode_select(st, 0)) 1823 goto bad; 1824 st_read(st, buf, readsiz, SCSI_SILENT); 1825 if (error = st_rewind(st, 0, 0)) { 1826 bad: free(buf, M_TEMP); 1827 return error; 1828 } 1829 } while (readsiz != 1 && readsiz > st->blksiz); 1830 free(buf, M_TEMP); 1831 return 0; 1832 } 1833 1834 int 1835 stdump() 1836 { 1837 1838 /* Not implemented. */ 1839 return EINVAL; 1840 } 1841