Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/scsi/st.c
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1 /* 2 * Written by Julian Elischer (julian@tfs.com)(now julian@DIALix.oz.au) 3 * for TRW Financial Systems for use under the MACH(2.5) operating system. 4 * 5 * TRW Financial Systems, in accordance with their agreement with Carnegie 6 * Mellon University, makes this software available to CMU to distribute 7 * or use in any manner that they see fit as long as this message is kept with 8 * the software. For this reason TFS also grants any other persons or 9 * organisations permission to use or modify this software. 10 * 11 * TFS supplies this software to be publicly redistributed 12 * on the understanding that TFS is not responsible for the correct 13 * functioning of this software in any circumstances. 14 * 15 * $FreeBSD: src/sys/scsi/st.c,v 1.73.2.4 1999/09/05 08:21:51 peter Exp $ 16 */ 17 18 /* 19 * Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992 20 * major changes by Julian Elischer (julian@jules.dialix.oz.au) May 1993 21 */ 22 23 /* 24 * To do: 25 * work out some better way of guessing what a good timeout is going 26 * to be depending on whether we expect to retension or not. 27 * 28 */ 29 30 #include "opt_bounce.h" 31 #include "opt_scsi.h" 32 33 #include <sys/types.h> 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 38 #include <sys/fcntl.h> 39 #include <sys/errno.h> 40 #include <sys/ioctl.h> 41 #include <sys/malloc.h> 42 #include <sys/buf.h> 43 #include <sys/proc.h> 44 #include <sys/mtio.h> 45 #include <sys/conf.h> 46 #include <sys/kernel.h> 47 #ifdef DEVFS 48 #include <sys/devfsext.h> 49 #endif /*DEVFS*/ 50 51 #include <scsi/scsi_all.h> 52 #include <scsi/scsi_tape.h> 53 #include <scsi/scsiconf.h> 54 55 56 57 /* Defines for device specific stuff */ 58 #define PAGE_0_SENSE_DATA_SIZE 12 59 #define DEF_FIXED_BSIZE 512 60 #define ST_RETRIES 4 /* only on non IO commands */ 61 62 #define STUNIT(DEV) ((minor(DEV)&0xF0) >> 4) /* 4 bit unit. */ 63 #define STSETUNIT(DEV, U) makedev(major(DEV), ((U) << 4)) 64 65 #define MODE(z) ( (minor(z) & 0x03) ) 66 #define DSTY(z) ( ((minor(z) >> 2) & 0x03) ) 67 #define CTLMODE 3 68 69 #define IS_CTLMODE(DEV) (MODE(DEV) == CTLMODE) 70 71 static errval st_space __P((u_int32_t unit, int32_t number, u_int32_t what, u_int32_t flags)); 72 static errval st_rewind __P((u_int32_t unit, boolean immed, u_int32_t flags)); 73 static errval st_erase __P((u_int32_t unit, boolean immed, u_int32_t flags)); 74 static errval st_mode_sense __P((u_int32_t unit, u_int32_t flags, \ 75 struct tape_pages *page, u_int32_t pagelen, u_int32_t pagecode)); 76 static errval st_decide_mode __P((u_int32_t unit, boolean first_read)); 77 static errval st_read __P((u_int32_t unit, char *buf, u_int32_t size, 78 u_int32_t flags)); 79 static errval st_rd_blk_lim __P((u_int32_t unit, u_int32_t flags)); 80 static errval st_touch_tape __P((u_int32_t unit)); 81 static errval st_write_filemarks __P((u_int32_t unit, int32_t number, u_int32_t flags)); 82 static errval st_load __P((u_int32_t unit, u_int32_t type, u_int32_t flags)); 83 static errval st_mode_select __P((u_int32_t unit, u_int32_t flags, \ 84 struct tape_pages *page, u_int32_t pagelen, u_int32_t byte2)); 85 static errval st_comp __P((u_int32_t unit, u_int32_t mode)); 86 static int32_t st_chkeod __P((u_int32_t unit, boolean position, int32_t *nmarks, 87 u_int32_t flags)); 88 static void ststart(u_int32_t unit, u_int32_t flags); 89 static void st_unmount __P((int unit, boolean eject)); 90 static errval st_mount_tape __P((dev_t dev, u_int32_t flags)); 91 static void st_loadquirks __P((struct scsi_link *sc_link)); 92 static errval st_interpret_sense __P((struct scsi_xfer *xs)); 93 94 #define ESUCCESS 0 95 #define NOEJECT 0 96 #define EJECT 1 97 98 struct scsi_data { 99 /*--------------------present operating parameters, flags etc.----------------*/ 100 u_int32_t flags; /* see below */ 101 u_int32_t blksiz; /* blksiz we are using */ 102 u_int32_t density; /* present density */ 103 u_int32_t comp; /* present compression mode */ 104 u_int32_t quirks; /* quirks for the open mode */ 105 u_int32_t last_dsty; /* last density openned */ 106 /*--------------------parameters reported by the device ----------------------*/ 107 u_int32_t blkmin; /* min blk size */ 108 u_int32_t blkmax; /* max blk size */ 109 /*--------------------parameters reported by the device for this media--------*/ 110 u_int32_t numblks; /* nominal blocks capacity */ 111 u_int32_t media_blksiz; /* 0 if not ST_FIXEDBLOCKS */ 112 u_int32_t media_density; /* this is what it said when asked */ 113 /*--------------------quirks for the whole drive------------------------------*/ 114 u_int32_t drive_quirks; /* quirks of this drive */ 115 /*--------------------How we should set up when openning each minor device----*/ 116 st_modes modes; /* plus more for each mode */ 117 u_int8_t modeflags[4]; /* flags for the modes */ 118 #define DENSITY_SET_BY_USER 0x01 119 #define DENSITY_SET_BY_QUIRK 0x02 120 #define BLKSIZE_SET_BY_USER 0x04 121 #define BLKSIZE_SET_BY_QUIRK 0x08 122 #define COMPRES_SET_BY_USER 0x10 123 #define COMPRES_SET_BY_QUIRK 0x20 124 /*--------------------storage for sense data returned by the drive------------*/ 125 unsigned char saved_page0[PAGE_0_SENSE_DATA_SIZE]; /* 126 * additional sense data needed 127 * for mode sense/select. 128 */ 129 struct buf_queue_head buf_queue; 130 struct scsi_xfer scsi_xfer; /* scsi xfer struct for this drive */ 131 u_int32_t xfer_block_wait; /* is a process waiting? */ 132 #ifdef DEVFS 133 struct { 134 void *rst; 135 void *nrst; 136 void *erst; 137 /* end of aliases */ 138 void *rst_[4]; 139 void *nrst_[4]; 140 void *erst_[4]; 141 void *ctl_[4]; 142 void *ctl; 143 } devfs_token; 144 #endif 145 }; 146 147 static int stunit(dev_t dev) { return STUNIT(dev); } 148 static dev_t stsetunit(dev_t dev, int unit) { return STSETUNIT(dev, unit); } 149 150 static errval st_open(dev_t dev, int flags, int fmt, struct proc *p, 151 struct scsi_link *sc_link); 152 static errval st_ioctl(dev_t dev, int cmd, caddr_t addr, int flag, 153 struct proc *p, struct scsi_link *sc_link); 154 static errval st_close(dev_t dev, int flag, int fmt, struct proc *p, 155 struct scsi_link *sc_link); 156 static void st_strategy(struct buf *bp, struct scsi_link *sc_link); 157 158 static d_open_t stopen; 159 static d_close_t stclose; 160 static d_ioctl_t stioctl; 161 static d_strategy_t ststrategy; 162 163 #define CDEV_MAJOR 14 164 #define BDEV_MAJOR 5 165 static struct cdevsw st_cdevsw; 166 static struct bdevsw st_bdevsw = 167 { stopen, stclose, ststrategy, stioctl, /*5*/ 168 nodump, nopsize, 0, "st", &st_cdevsw, -1 }; 169 170 SCSI_DEVICE_ENTRIES(st) 171 172 static struct scsi_device st_switch = 173 { 174 st_interpret_sense, /* check errors with us first */ 175 ststart, /* we have a queue, and this is how we service it */ 176 NULL, 177 NULL, /* use the default 'done' routine */ 178 "st", 179 0, 180 {0, 0}, 181 0, /* Link flags */ 182 stattach, 183 "Sequential-Access", 184 stopen, 185 sizeof(struct scsi_data), 186 T_SEQUENTIAL, 187 stunit, 188 stsetunit, 189 st_open, 190 st_ioctl, 191 st_close, 192 st_strategy, 193 }; 194 195 #define ST_INITIALIZED 0x01 196 #define ST_INFO_VALID 0x02 197 #define ST_OPEN 0x04 198 #define ST_BLOCK_SET 0x08 /* block size, mode set by ioctl */ 199 #define ST_WRITTEN 0x10 /* data have been written, EOD needed */ 200 #define ST_FIXEDBLOCKS 0x20 201 #define ST_AT_FILEMARK 0x40 202 #define ST_EIO_PENDING 0x80 /* we couldn't report it then (had data) */ 203 #define ST_NEW_MOUNT 0x100 /* still need to decide mode */ 204 #define ST_READONLY 0x200 /* st_mode_sense says write protected */ 205 #define ST_FM_WRITTEN 0x400 /* 206 * EOF file mark written -- used with 207 * ~ST_WRITTEN to indicate that multiple file 208 * marks have been written 209 */ 210 #define ST_BLANK_READ 0x800 /* BLANK CHECK encountered already */ 211 #define ST_2FM_AT_EOD 0x1000 /* write 2 file marks at EOD */ 212 #define ST_MOUNTED 0x2000 /* Device is presently mounted */ 213 #define ST_SENSE_READ 0x4000 /* mode sense read from drive */ 214 215 #define ST_PER_ACTION (ST_AT_FILEMARK | ST_EIO_PENDING | ST_BLANK_READ) 216 #define ST_PER_MOUNT (ST_INFO_VALID | ST_BLOCK_SET | ST_WRITTEN | \ 217 ST_FIXEDBLOCKS | ST_READONLY | \ 218 ST_FM_WRITTEN | ST_2FM_AT_EOD | ST_PER_ACTION) 219 220 /* 221 * The routine called by the low level scsi routine when it discovers 222 * a device suitable for this driver 223 */ 224 225 static errval 226 stattach(struct scsi_link *sc_link) 227 { 228 u_int32_t unit; 229 #ifdef DEVFS 230 int ii; 231 #endif /*DEVFS*/ 232 233 struct scsi_data *st = sc_link->sd; 234 235 unit = sc_link->dev_unit; 236 237 bufq_init(&st->buf_queue); 238 /* 239 * Check if the drive is a known criminal and take 240 * Any steps needed to bring it into line 241 */ 242 st_loadquirks(sc_link); 243 /* 244 * Use the subdriver to request information regarding 245 * the drive. We cannot use interrupts yet, so the 246 * request must specify this. 247 */ 248 if (st_mode_sense(unit, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT, 249 NULL, 0, 0)) { 250 printf("drive offline"); 251 } else { 252 printf("density code 0x%lx, ", st->media_density); 253 if (!scsi_test_unit_ready(sc_link, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT)) { 254 if (st->media_blksiz) { 255 printf("%ld-byte", st->media_blksiz); 256 } else { 257 printf("variable"); 258 } 259 printf(" blocks, write-%s", 260 (st->flags & ST_READONLY) ? "protected" : "enabled"); 261 } else { 262 printf(" drive empty"); 263 } 264 } 265 /* 266 * Set up the buf queue for this device 267 */ 268 st->flags |= ST_INITIALIZED; 269 #ifdef DEVFS 270 for(ii=0; ii<4; ii++) { 271 st->devfs_token.rst_[ii] = 272 devfs_add_devswf(&st_cdevsw, 273 (unit << 4 ) + (ii * 4), DV_CHR, 274 UID_ROOT, GID_OPERATOR, 0660, 275 "rst%ld.%d", unit, ii); 276 st->devfs_token.nrst_[ii] = 277 devfs_add_devswf(&st_cdevsw, 278 (unit << 4 ) + ((ii * 4) + 1), DV_CHR, 279 UID_ROOT, GID_OPERATOR, 0660, 280 "nrst%ld.%d", unit, ii); 281 st->devfs_token.erst_[ii] = 282 devfs_add_devswf(&st_cdevsw, 283 (unit << 4 ) + ((ii * 4) + 2), DV_CHR, 284 UID_ROOT, GID_OPERATOR, 0660, 285 "erst%ld.%d", unit, ii); 286 st->devfs_token.ctl_[ii] = 287 devfs_add_devswf(&st_cdevsw, 288 (unit << 4 ) + ((ii * 4) + 3), DV_CHR, 289 UID_ROOT, GID_OPERATOR, 0600, 290 "st%ldctl.%d", unit, ii); 291 } 292 293 st->devfs_token.ctl = 294 devfs_add_devswf(&st_cdevsw, (unit << 4 ) | SCSI_CONTROL_MASK, 295 DV_CHR, UID_ROOT, GID_WHEEL, 0600, 296 "rst%d.ctl", unit); 297 /** add links **/ 298 st->devfs_token.rst = 299 devfs_link(st->devfs_token.rst_[0], "rst%ld", unit); 300 st->devfs_token.nrst = 301 devfs_link(st->devfs_token.nrst_[0], "nrst%ld", unit); 302 st->devfs_token.erst = 303 devfs_link(st->devfs_token.erst_[0], "erst%ld", unit); 304 #endif 305 return 0; 306 } 307 308 309 /* 310 * initialise the subdevices to the default (QUIRK) state. 311 * this will remove any setting made by the system operator or previous 312 * operations. 313 */ 314 static void 315 st_loadquirks(sc_link) 316 struct scsi_link *sc_link; 317 { 318 struct scsi_data *st = sc_link->sd; 319 int i; 320 struct st_mode *mode; 321 struct st_mode *mode2; 322 323 mode = (struct st_mode*) sc_link->devmodes; 324 if (!mode) 325 return; 326 327 st->quirks = st->drive_quirks = sc_link->quirks; 328 329 mode2 = st->modes; 330 331 for (i = 0; i < 4; i++) { 332 bzero(mode2, sizeof(*mode2)); 333 st->modeflags[i] &= ~(BLKSIZE_SET_BY_QUIRK 334 | DENSITY_SET_BY_QUIRK 335 | BLKSIZE_SET_BY_USER 336 | DENSITY_SET_BY_USER); 337 if (mode->blksiz && ((mode->quirks | st->drive_quirks) 338 & (ST_Q_FORCE_FIXED_MODE))) { 339 mode2->blksiz = mode->blksiz; 340 st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK; 341 } else { 342 if ((mode->quirks | st->drive_quirks) 343 & ST_Q_FORCE_VAR_MODE) { 344 mode2->blksiz = 0; 345 st->modeflags[i] |= BLKSIZE_SET_BY_QUIRK; 346 } 347 } 348 if (mode->density) { 349 mode2->density = mode->density; 350 st->modeflags[i] |= DENSITY_SET_BY_QUIRK; 351 } 352 mode++; 353 mode2++; 354 } 355 } 356 357 /* 358 * open the device. 359 */ 360 static errval 361 st_open(dev_t dev, int flags, int fmt, struct proc *p, 362 struct scsi_link *sc_link) 363 { 364 u_int32_t unit, mode, dsty; 365 errval errno = 0; 366 struct scsi_data *st; 367 368 unit = STUNIT(dev); 369 mode = MODE(dev); 370 dsty = DSTY(dev); 371 372 st = sc_link->sd; 373 /* 374 * Make sure the device has been initialised 375 */ 376 if ((st == NULL) || (!(st->flags & ST_INITIALIZED))) 377 return (ENXIO); 378 379 /* 380 * Only allow one at a time 381 */ 382 if (st->flags & ST_OPEN) { 383 return (EBUSY); 384 } 385 /* 386 * Throw out a dummy instruction to catch 'Unit attention 387 * errors (the error handling will invalidate all our 388 * device info if we get one, but otherwise, ignore it) 389 */ 390 scsi_test_unit_ready(sc_link, SCSI_SILENT); 391 392 sc_link->flags |= SDEV_OPEN; /* unit attn are now errors */ 393 /* 394 * If the mode is 3 (e.g. minor = 3,7,11,15) 395 * then the device has been openned to set defaults 396 * This mode does NOT ALLOW I/O, only ioctls. 397 * XXX: Where do we lock out I/O? 398 */ 399 if (IS_CTLMODE(dev)) 400 return 0; 401 402 /* 403 * Check that the device is ready to use (media loaded?) 404 * This time take notice of the return result 405 */ 406 if ( (errno = scsi_test_unit_ready(sc_link, 0)) ) { 407 uprintf("st%d: not ready\n", unit); 408 st_unmount(unit, NOEJECT); 409 return (errno); 410 } 411 /* 412 * if it's a different mode, or if the media has been 413 * invalidated, unmount the tape from the previous 414 * session but continue with open processing 415 */ 416 if ((st->last_dsty != dsty) 417 || (!(sc_link->flags & SDEV_MEDIA_LOADED))) { 418 st_unmount(unit, NOEJECT); 419 } 420 /* 421 * If we are not mounted, then we should start a new 422 * mount session. 423 */ 424 if (!(st->flags & ST_MOUNTED)) { 425 st_mount_tape(dev, flags); 426 st->last_dsty = dsty; 427 } 428 /* 429 * Make sure that a tape opened in write-only mode will have 430 * file marks written on it when closed, even if not written to. 431 * This is for SUN compatibility 432 */ 433 if ((flags & O_ACCMODE) == FWRITE) 434 st->flags |= ST_WRITTEN; 435 436 /* PREVENT ALLOW MEDIUM REMOVAL is optional per the SCSI-2 specs */ 437 scsi_prevent(sc_link, PR_PREVENT, SCSI_SILENT | SCSI_ERR_OK); 438 439 SC_DEBUG(sc_link, SDEV_DB2, ("Open complete\n")); 440 441 st->flags |= ST_OPEN; 442 return 0; 443 } 444 445 /* 446 * close the device.. only called if we are the LAST 447 * occurence of an open device 448 */ 449 static errval 450 st_close(dev_t dev, int flag, int fmt, struct proc *p, 451 struct scsi_link *sc_link) 452 { 453 u_int32_t unit, mode; 454 struct scsi_data *st; 455 456 unit = STUNIT(dev); 457 mode = MODE(dev); 458 st = sc_link->sd; 459 460 if ((st->flags & (ST_WRITTEN | ST_FM_WRITTEN)) == ST_WRITTEN) 461 st_write_filemarks(unit, 1, 0); 462 463 /* 464 * Since the device has seen its last close, allow media removal. 465 * Do this before we attempt an eject. 466 */ 467 scsi_prevent(sc_link, PR_ALLOW, SCSI_SILENT); 468 469 switch (mode & 0x3) { 470 case 0: 471 case 3: /* for now */ 472 st_unmount(unit, NOEJECT); 473 break; 474 case 1: /*leave mounted unless media seems to have been removed */ 475 if (!(sc_link->flags & SDEV_MEDIA_LOADED)) { 476 st_unmount(unit, NOEJECT); 477 } 478 break; 479 case 2: 480 st_unmount(unit, EJECT); 481 break; 482 } 483 484 sc_link->flags &= ~SDEV_OPEN; 485 st->flags &= ~ST_OPEN; 486 487 return (0); 488 } 489 490 /* 491 * Start a new mount session. 492 * Copy in all the default parameters from the selected device mode. 493 * and try guess any that seem to be defaulted. 494 */ 495 static errval 496 st_mount_tape(dev, flags) 497 dev_t dev; 498 u_int32_t flags; 499 { 500 u_int32_t unit, mode, dsty; 501 struct scsi_data *st; 502 struct scsi_link *sc_link; 503 errval errno = 0; 504 505 unit = STUNIT(dev); 506 mode = MODE(dev); 507 dsty = DSTY(dev); 508 sc_link = SCSI_LINK(&st_switch, unit); 509 st = sc_link->sd; 510 511 if (st->flags & ST_MOUNTED) 512 return 0; 513 514 SC_DEBUG(sc_link, SDEV_DB1, ("mounting\n ")); 515 st->flags |= ST_NEW_MOUNT; 516 st->quirks = st->drive_quirks | st->modes[dsty].quirks; 517 /* 518 * If the media is new, then make sure we give it a chance to 519 * to do a 'load' instruction. ( We assume it is new) 520 */ 521 if ( (errno = st_load(unit, LD_LOAD, 0)) ) { 522 return (errno); 523 } 524 /* 525 * Throw another dummy instruction to catch 526 * 'Unit attention' errors. Some drives appear to give 527 * these after doing a Load instruction. 528 * (noteably some DAT drives) 529 */ 530 scsi_test_unit_ready(sc_link, SCSI_SILENT); 531 532 /* 533 * Some devices can't tell you much until they have been 534 * asked to look at the media. This quirk does this. 535 */ 536 if (st->quirks & ST_Q_SNS_HLP) { 537 if ( (errno = st_touch_tape(unit)) ) 538 return errno; 539 } 540 /* 541 * Load the physical device parameters 542 * loads: blkmin, blkmax 543 */ 544 if ( (errno = st_rd_blk_lim(unit, 0)) ) { 545 return errno; 546 } 547 /* 548 * Load the media dependent parameters 549 * includes: media_blksiz,media_density,numblks 550 * As we have a tape in, it should be reflected here. 551 * If not you may need the "quirk" above. 552 */ 553 if ( (errno = st_mode_sense(unit, 0, NULL, 0, 0)) ) { 554 return errno; 555 } 556 /* 557 * If we have gained a permanent density from somewhere, 558 * then use it in preference to the one supplied by 559 * default by the driver. 560 */ 561 if (st->modeflags[dsty] & (DENSITY_SET_BY_QUIRK | DENSITY_SET_BY_USER)) { 562 st->density = st->modes[dsty].density; 563 } else { 564 st->density = st->media_density; 565 } 566 /* 567 * If we have gained a permanent blocksize 568 * then use it in preference to the one supplied by 569 * default by the driver. 570 */ 571 st->flags &= ~ST_FIXEDBLOCKS; 572 if (st->modeflags[dsty] & (BLKSIZE_SET_BY_QUIRK | BLKSIZE_SET_BY_USER)) { 573 st->blksiz = st->modes[dsty].blksiz; 574 if (st->blksiz) { 575 st->flags |= ST_FIXEDBLOCKS; 576 } 577 } else { 578 if ( (errno = st_decide_mode(unit, FALSE)) ) { 579 return errno; 580 } 581 } 582 if ( (errno = st_mode_select(unit, 0, NULL, 0, 0)) ) { 583 printf("st%ld: Cannot set selected mode", unit); 584 return errno; 585 } 586 st->flags &= ~ST_NEW_MOUNT; 587 st->flags |= ST_MOUNTED; 588 sc_link->flags |= SDEV_MEDIA_LOADED; 589 590 return 0; 591 } 592 593 /* 594 * End the present mount session. 595 * Rewind, and optionally eject the tape. 596 * Reset various flags to indicate that all new 597 * operations require another mount operation 598 */ 599 void 600 st_unmount(int unit, boolean eject) 601 { 602 struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); 603 struct scsi_data *st = sc_link->sd; 604 int32_t nmarks; 605 606 if (!(st->flags & ST_MOUNTED)) 607 return; 608 SC_DEBUG(sc_link, SDEV_DB1, ("unmounting\n")); 609 st_chkeod(unit, FALSE, &nmarks, SCSI_SILENT); 610 st_rewind(unit, FALSE, SCSI_SILENT); 611 if (eject) { 612 st_load(unit, LD_UNLOAD, SCSI_SILENT); 613 } 614 st->flags &= ~(ST_MOUNTED | ST_NEW_MOUNT); 615 sc_link->flags &= ~SDEV_MEDIA_LOADED; 616 } 617 618 /* 619 * Given all we know about the device, media, mode, 'quirks' and 620 * initial operation, make a decision as to how we should be set 621 * to run (regarding blocking and EOD marks) 622 */ 623 static errval 624 st_decide_mode(unit, first_read) 625 u_int32_t unit; 626 boolean first_read; 627 { 628 struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); 629 struct scsi_data *st = sc_link->sd; 630 631 SC_DEBUG(sc_link, SDEV_DB2, ("starting block mode decision\n")); 632 633 /* 634 * If the user hasn't already specified fixed or variable-length 635 * blocks and the block size (zero if variable-length), we'll 636 * have to try to figure them out ourselves. 637 * 638 * Our first shot at a method is, "The quirks made me do it!" 639 */ 640 switch ((int)(st->quirks & (ST_Q_FORCE_FIXED_MODE | ST_Q_FORCE_VAR_MODE))) { 641 case (ST_Q_FORCE_FIXED_MODE | ST_Q_FORCE_VAR_MODE): 642 printf("st%ld: bad quirks\n", unit); 643 return (EINVAL); 644 case ST_Q_FORCE_FIXED_MODE: /*specified fixed, but not what size */ 645 st->flags |= ST_FIXEDBLOCKS; 646 if (st->blkmin && (st->blkmin == st->blkmax)) 647 st->blksiz = st->blkmin; 648 else if (st->media_blksiz > 0) 649 st->blksiz = st->media_blksiz; 650 else 651 st->blksiz = DEF_FIXED_BSIZE; 652 SC_DEBUG(sc_link, SDEV_DB3, ("Quirks force fixed mode(%ld)\n", 653 st->blksiz)); 654 goto done; 655 case ST_Q_FORCE_VAR_MODE: 656 st->flags &= ~ST_FIXEDBLOCKS; 657 st->blksiz = 0; 658 SC_DEBUG(sc_link, SDEV_DB3, ("Quirks force variable mode\n")); 659 goto done; 660 } 661 /* 662 * If the drive can only handle fixed-length blocks and only at 663 * one size, perhaps we should just do that. 664 */ 665 if (st->blkmin && (st->blkmin == st->blkmax)) { 666 st->flags |= ST_FIXEDBLOCKS; 667 st->blksiz = st->blkmin; 668 SC_DEBUG(sc_link, SDEV_DB3, 669 ("blkmin == blkmax of %ld\n", st->blkmin)); 670 goto done; 671 } 672 /* 673 * If the tape density mandates (or even suggests) use of fixed 674 * or variable-length blocks, comply. 675 */ 676 switch ((int)st->density) { 677 case HALFINCH_800: 678 case HALFINCH_1600: 679 case HALFINCH_6250: 680 case DDS: 681 case QIC_525: 682 case QIC_1320: 683 case QIC_3080: 684 st->flags &= ~ST_FIXEDBLOCKS; 685 st->blksiz = 0; 686 SC_DEBUG(sc_link, SDEV_DB3, ("density specified variable\n")); 687 goto done; 688 case QIC_11: 689 case QIC_24: 690 case QIC_120: 691 case QIC_150: 692 st->flags |= ST_FIXEDBLOCKS; 693 if (st->media_blksiz > 0) { 694 st->blksiz = st->media_blksiz; 695 } else { 696 st->blksiz = DEF_FIXED_BSIZE; 697 } 698 SC_DEBUG(sc_link, SDEV_DB3, ("density specified fixed\n")); 699 goto done; 700 } 701 /* 702 * If we're about to read the tape, perhaps we should choose 703 * fixed or variable-length blocks and block size according to 704 * what the drive found on the tape. 705 */ 706 if (first_read 707 && (!(st->quirks & ST_Q_BLKSIZ) 708 || (st->media_blksiz == 0) 709 || (st->media_blksiz == DEF_FIXED_BSIZE) 710 || (st->media_blksiz == 1024))) { 711 if (st->media_blksiz == 0) { 712 st->flags &= ~ST_FIXEDBLOCKS; 713 } else { 714 st->flags |= ST_FIXEDBLOCKS; 715 } 716 st->blksiz = st->media_blksiz; 717 SC_DEBUG(sc_link, SDEV_DB3, 718 ("Used media_blksiz of %ld\n", st->media_blksiz)); 719 goto done; 720 } 721 /* 722 * We're getting no hints from any direction. Choose variable- 723 * length blocks arbitrarily. 724 */ 725 st->flags &= ~ST_FIXEDBLOCKS; 726 st->blksiz = 0; 727 SC_DEBUG(sc_link, SDEV_DB3, ("Give up and default to variable mode\n")); 728 done: 729 730 /* 731 * Decide whether or not to write two file marks to signify end- 732 * of-data. Make the decision as a function of density. If 733 * the decision is not to use a second file mark, the SCSI BLANK 734 * CHECK condition code will be recognized as end-of-data when 735 * first read. 736 * (I think this should be a by-product of fixed/variable..julian) 737 */ 738 switch ((int)st->density) { 739 /* case 8 mm: What is the SCSI density code for 8 mm, anyway? */ 740 case QIC_11: 741 case QIC_24: 742 case QIC_120: 743 case QIC_150: 744 case QIC_525: 745 case QIC_1320: 746 case QIC_3080: 747 st->flags &= ~ST_2FM_AT_EOD; 748 break; 749 default: 750 st->flags |= ST_2FM_AT_EOD; 751 } 752 return 0; 753 } 754 755 /* 756 * Actually translate the requested transfer into 757 * one the physical driver can understand 758 * The transfer is described by a buf and will include 759 * only one physical transfer. 760 */ 761 static void 762 st_strategy(struct buf *bp, struct scsi_link *sc_link) 763 { 764 u_int32_t unit; 765 u_int32_t opri; 766 struct scsi_data *st; 767 int len; 768 769 unit = STUNIT((bp->b_dev)); 770 st = sc_link->sd; 771 /* 772 * If it's a null transfer, return immediatly 773 */ 774 if ((len = bp->b_bcount) == 0) { 775 goto done; 776 } 777 /* 778 * Check the adapter can do it 779 */ 780 scsi_minphys(bp,&st_switch); 781 /* 782 * Odd sized request on fixed drives are verboten 783 */ 784 if (st->flags & ST_FIXEDBLOCKS) { 785 if (bp->b_bcount % st->blksiz) { 786 printf("st%ld: bad request, must be multiple of %ld\n", 787 unit, st->blksiz); 788 bp->b_error = EIO; 789 goto bad; 790 } 791 } 792 /* 793 * as are out-of-range requests on variable drives. 794 * (or if we got chopped by minphys) 795 */ 796 else { 797 if ((bp->b_bcount < st->blkmin || bp->b_bcount > st->blkmax)) { 798 printf("st%ld: bad request, must be between %ld and %ld\n", 799 unit, st->blkmin, st->blkmax); 800 bp->b_error = EIO; 801 goto bad; 802 } 803 if (len != bp->b_bcount) { 804 printf("st%ld: bad request, must be less than %ld bytes\n", 805 unit, bp->b_bcount + 1); 806 bp->b_error = EIO; 807 goto bad; 808 } 809 } 810 opri = splbio(); 811 812 /* 813 * Use a bounce buffer if necessary 814 */ 815 #ifdef BOUNCE_BUFFERS 816 if (sc_link->flags & SDEV_BOUNCE) 817 vm_bounce_alloc(bp); 818 #endif 819 820 /* 821 * Place it in the queue of activities for this tape 822 * at the end (a bit silly because we only have on user.. 823 * (but it could fork() )) 824 */ 825 bufq_insert_tail(&st->buf_queue, bp); 826 827 /* 828 * Tell the device to get going on the transfer if it's 829 * not doing anything, otherwise just wait for completion 830 * (All a bit silly if we're only allowing 1 open but..) 831 */ 832 ststart(unit, 0); 833 834 splx(opri); 835 return; 836 bad: 837 bp->b_flags |= B_ERROR; 838 done: 839 /* 840 * Correctly set the buf to indicate a completed xfer 841 */ 842 biodone(bp); 843 return; 844 } 845 846 /* 847 * ststart looks to see if there is a buf waiting for the device 848 * and that the device is not already busy. If both are true, 849 * It dequeues the buf and creates a scsi command to perform the 850 * transfer required. The transfer request will call scsi_done 851 * on completion, which will in turn call this routine again 852 * so that the next queued transfer is performed. 853 * The bufs are queued by the strategy routine (ststrategy) 854 * 855 * This routine is also called after other non-queued requests 856 * have been made of the scsi driver, to ensure that the queue 857 * continues to be drained. 858 * ststart() is called at splbio 859 */ 860 static void 861 ststart(unit, flags) 862 u_int32_t unit; 863 u_int32_t flags; 864 { 865 struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); 866 struct scsi_data *st = sc_link->sd; 867 register struct buf *bp = 0; 868 struct scsi_rw_tape cmd; 869 870 SC_DEBUG(sc_link, SDEV_DB2, ("ststart ")); 871 /* 872 * See if there is a buf to do and we are not already 873 * doing one 874 */ 875 while (sc_link->opennings != 0) { 876 877 /* if a special awaits, let it proceed first */ 878 if (sc_link->flags & SDEV_WAITING) { 879 sc_link->flags &= ~SDEV_WAITING; 880 wakeup((caddr_t)sc_link); 881 return; 882 } 883 884 bp = bufq_first(&st->buf_queue); 885 if (bp == NULL) { /* yes, an assign */ 886 return; 887 } 888 bufq_remove(&st->buf_queue, bp); 889 890 /* 891 * if the device has been unmounted by the user 892 * then throw away all requests until done 893 */ 894 if ((!(st->flags & ST_MOUNTED)) 895 || (!(sc_link->flags & SDEV_MEDIA_LOADED))) { 896 /* make sure that one implies the other.. */ 897 sc_link->flags &= ~SDEV_MEDIA_LOADED; 898 goto badnews; 899 } 900 /* 901 * only FIXEDBLOCK devices have pending operations 902 */ 903 if (st->flags & ST_FIXEDBLOCKS) { 904 /* 905 * If we are at a filemark but have not reported it yet 906 * then we should report it now 907 */ 908 if (st->flags & ST_AT_FILEMARK) { 909 if ((bp->b_flags & B_READ) == B_WRITE) { 910 /* 911 * Handling of ST_AT_FILEMARK in 912 * st_space will fill in the right file 913 * mark count. 914 * Back up over filemark 915 */ 916 if (st_space(unit, 0, SP_FILEMARKS, 0) != 917 ESUCCESS) 918 goto badnews; 919 } else { 920 bp->b_resid = bp->b_bcount; 921 bp->b_error = 0; 922 bp->b_flags &= ~B_ERROR; 923 st->flags &= ~ST_AT_FILEMARK; 924 biodone(bp); 925 continue; /* seek more work */ 926 } 927 } 928 /* 929 * If we are at EIO (e.g. EOM) but have not reported it 930 * yet then we should report it now 931 */ 932 if (st->flags & ST_EIO_PENDING) { 933 bp->b_resid = bp->b_bcount; 934 bp->b_error = EIO; 935 bp->b_flags |= B_ERROR; 936 st->flags &= ~ST_EIO_PENDING; 937 biodone(bp); 938 continue; /* seek more work */ 939 } 940 } 941 /* 942 * Fill out the scsi command 943 */ 944 bzero(&cmd, sizeof(cmd)); 945 if ((bp->b_flags & B_READ) == B_WRITE) { 946 cmd.op_code = WRITE_COMMAND_TAPE; 947 st->flags &= ~ST_FM_WRITTEN; 948 st->flags |= ST_WRITTEN; 949 flags |= SCSI_DATA_OUT; 950 } else { 951 cmd.op_code = READ_COMMAND_TAPE; 952 flags |= SCSI_DATA_IN; 953 } 954 /* 955 * Handle "fixed-block-mode" tape drives by using the 956 * block count instead of the length. 957 */ 958 if (st->flags & ST_FIXEDBLOCKS) { 959 cmd.byte2 |= SRWT_FIXED; 960 scsi_uto3b(bp->b_bcount / st->blksiz, cmd.len); 961 } else { 962 scsi_uto3b(bp->b_bcount, cmd.len); 963 } 964 /* 965 * go ask the adapter to do all this for us 966 */ 967 if (scsi_scsi_cmd(sc_link, 968 (struct scsi_generic *) &cmd, 969 sizeof(cmd), 970 (u_char *) bp->b_un.b_addr, 971 bp->b_bcount, 972 0, /* can't retry a read on a tape really */ 973 100000, 974 bp, 975 flags) == SUCCESSFULLY_QUEUED) { 976 } else { 977 badnews: 978 printf("st%ld: oops not queued\n", unit); 979 bp->b_flags |= B_ERROR; 980 bp->b_error = EIO; 981 biodone(bp); 982 } 983 } /* go back and see if we can cram more work in.. */ 984 } 985 986 /* 987 * Perform special action on behalf of the user; 988 * knows about the internals of this device 989 */ 990 static errval 991 st_ioctl(dev_t dev, int cmd, caddr_t arg, int flag, 992 struct proc *p, struct scsi_link *sc_link) 993 { 994 errval errcode = 0; 995 u_int32_t unit; 996 u_int32_t number, flags, dsty; 997 struct scsi_data *st; 998 u_int32_t hold_blksiz; 999 u_int32_t hold_density; 1000 int32_t nmarks; 1001 struct mtop *mt = (struct mtop *) arg; 1002 1003 /* 1004 * Find the device that the user is talking about 1005 */ 1006 flags = 0; /* give error messages, act on errors etc. */ 1007 unit = STUNIT(dev); 1008 dsty = DSTY(dev); 1009 st = sc_link->sd; 1010 hold_blksiz = st->blksiz; 1011 hold_density = st->density; 1012 1013 switch (cmd) { 1014 1015 case MTIOCGET: 1016 { 1017 struct mtget *g = (struct mtget *) arg; 1018 1019 SC_DEBUG(sc_link, SDEV_DB1, ("[ioctl: get status]\n")); 1020 bzero(g, sizeof(struct mtget)); 1021 g->mt_type = 0x7; /* Ultrix compat *//*? */ 1022 g->mt_density = st->density; 1023 g->mt_blksiz = st->blksiz; 1024 g->mt_comp = st->comp; 1025 g->mt_density0 = st->modes[0].density; 1026 g->mt_density1 = st->modes[1].density; 1027 g->mt_density2 = st->modes[2].density; 1028 g->mt_density3 = st->modes[3].density; 1029 g->mt_blksiz0 = st->modes[0].blksiz; 1030 g->mt_blksiz1 = st->modes[1].blksiz; 1031 g->mt_blksiz2 = st->modes[2].blksiz; 1032 g->mt_blksiz3 = st->modes[3].blksiz; 1033 g->mt_comp0 = 0; 1034 g->mt_comp1 = 0; 1035 g->mt_comp2 = 0; 1036 g->mt_comp3 = 0; 1037 break; 1038 } 1039 case MTIOCTOP: 1040 { 1041 1042 SC_DEBUG(sc_link, SDEV_DB1, ("[ioctl: op=0x%x count=0x%lx]\n", 1043 mt->mt_op, mt->mt_count)); 1044 1045 /* compat: in U*x it is a short */ 1046 number = mt->mt_count; 1047 switch ((short) (mt->mt_op)) { 1048 case MTWEOF: /* write an end-of-file record */ 1049 errcode = st_write_filemarks(unit, number, flags); 1050 break; 1051 case MTBSF: /* backward space file */ 1052 number = -number; 1053 case MTFSF: /* forward space file */ 1054 errcode = st_chkeod(unit, FALSE, &nmarks, flags); 1055 if (errcode == ESUCCESS) 1056 errcode = st_space(unit, number - nmarks, 1057 SP_FILEMARKS, flags); 1058 break; 1059 case MTBSR: /* backward space record */ 1060 number = -number; 1061 case MTFSR: /* forward space record */ 1062 errcode = st_chkeod(unit, TRUE, &nmarks, flags); 1063 if (errcode == ESUCCESS) 1064 errcode = st_space(unit, number, SP_BLKS, flags); 1065 break; 1066 case MTEOD: /* space to end of recorded medium */ 1067 errcode = st_chkeod(unit, FALSE, &nmarks, flags); 1068 if (errcode == ESUCCESS) 1069 errcode = st_space(unit, 0, SP_EOM, 1070 flags); 1071 break; 1072 case MTREW: /* rewind */ 1073 errcode = st_rewind(unit, FALSE, flags); 1074 break; 1075 case MTERASE: /* erase */ 1076 errcode = st_erase(unit, FALSE, flags); 1077 break; 1078 case MTRETENS: /* re-tension tape */ 1079 errcode = st_load(unit, LD_LOAD|LD_RETEN, 1080 flags); 1081 break; 1082 case MTOFFL: /* rewind and put the drive offline */ 1083 /* 1084 * Be sure to allow media removal before 1085 * attempting the eject. 1086 */ 1087 scsi_prevent(sc_link, PR_ALLOW, SCSI_SILENT); 1088 st_unmount(unit, EJECT); 1089 break; 1090 case MTNOP: /* no operation, sets status only */ 1091 case MTCACHE: /* enable controller cache */ 1092 case MTNOCACHE: /* disable controller cache */ 1093 break; 1094 case MTSETBSIZ: /* Set block size for device */ 1095 #ifdef NOTYET 1096 if (!(st->flags & ST_NEW_MOUNT)) { 1097 uprintf("re-mount tape before changing blocksize"); 1098 errcode = EINVAL; 1099 break; 1100 } 1101 #endif 1102 if (number == 0) { 1103 st->flags &= ~ST_FIXEDBLOCKS; 1104 } else { 1105 if ((st->blkmin || st->blkmax) /* they exist */ 1106 &&((number < st->blkmin 1107 || number > st->blkmax))) { 1108 errcode = EINVAL; 1109 break; 1110 } 1111 st->flags |= ST_FIXEDBLOCKS; 1112 } 1113 st->blksiz = number; 1114 st->flags |= ST_BLOCK_SET; /*XXX */ 1115 goto try_new_value; 1116 1117 case MTSETDNSTY: /* Set density for device and mode */ 1118 if (number > (u_int8_t)0xff) { 1119 /* Guard against overflows */ 1120 errcode = EINVAL; 1121 } else { 1122 st->density = number; 1123 goto try_new_value; 1124 } 1125 break; 1126 case MTCOMP: /* enable default compression */ 1127 errcode = st_comp(unit,number); 1128 break; 1129 default: 1130 errcode = EINVAL; 1131 } 1132 break; 1133 } 1134 case MTIOCIEOT: 1135 case MTIOCEEOT: 1136 break; 1137 default: 1138 if(IS_CTLMODE(dev)) 1139 errcode = scsi_do_ioctl(dev, cmd, arg, flag, p, sc_link); 1140 else 1141 errcode = ENOTTY; 1142 break; 1143 } 1144 return errcode; 1145 /*-----------------------------*/ 1146 try_new_value: 1147 /* 1148 * Check that the mode being asked for is aggreeable to the 1149 * drive. If not, put it back the way it was. 1150 */ 1151 if ( (errcode = st_mode_select(unit, 0, NULL, 0, 0)) ) { 1152 /* 1153 * put back as it was 1154 */ 1155 printf("st%ld: Cannot set selected mode", unit); 1156 st->density = hold_density; 1157 st->blksiz = hold_blksiz; 1158 if (st->blksiz) { 1159 st->flags |= ST_FIXEDBLOCKS; 1160 } else { 1161 st->flags &= ~ST_FIXEDBLOCKS; 1162 } 1163 return (errcode); 1164 } 1165 /* 1166 * As the drive liked it, if we are setting a new default, 1167 * set it into the structures as such. 1168 * 1169 * The means for deciding this are not finalised yet 1170 */ 1171 if (IS_CTLMODE(dev)) { 1172 /* special mode */ 1173 /* XXX */ 1174 switch ((short) (mt->mt_op)) { 1175 case MTSETBSIZ: 1176 st->modes[dsty].blksiz = st->blksiz; 1177 st->modeflags[dsty] |= BLKSIZE_SET_BY_USER; 1178 break; 1179 case MTSETDNSTY: 1180 st->modes[dsty].density = st->density; 1181 st->modeflags[dsty] |= DENSITY_SET_BY_USER; 1182 break; 1183 } 1184 } 1185 return 0; 1186 } 1187 1188 /* 1189 * Do a synchronous read. 1190 */ 1191 static errval 1192 st_read(unit, buf, size, flags) 1193 u_int32_t unit, size, flags; 1194 char *buf; 1195 { 1196 struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); 1197 struct scsi_data *st = sc_link->sd; 1198 struct scsi_rw_tape scsi_cmd; 1199 1200 /* 1201 * If it's a null transfer, return immediatly 1202 */ 1203 if (size == 0) { 1204 return (ESUCCESS); 1205 } 1206 bzero(&scsi_cmd, sizeof(scsi_cmd)); 1207 scsi_cmd.op_code = READ_COMMAND_TAPE; 1208 if (st->flags & ST_FIXEDBLOCKS) { 1209 scsi_cmd.byte2 |= SRWT_FIXED; 1210 scsi_uto3b(size / (st->blksiz ? st->blksiz : DEF_FIXED_BSIZE), 1211 scsi_cmd.len); 1212 } else { 1213 scsi_uto3b(size, scsi_cmd.len); 1214 } 1215 return (scsi_scsi_cmd(sc_link, 1216 (struct scsi_generic *) &scsi_cmd, 1217 sizeof(scsi_cmd), 1218 (u_char *) buf, 1219 size, 1220 0, /* not on io commands */ 1221 100000, 1222 NULL, 1223 flags | SCSI_DATA_IN)); 1224 } 1225 #ifdef __STDC__ 1226 #define b2tol(a) (((unsigned)(a##_1) << 8) + (unsigned)a##_0 ) 1227 #else 1228 #define b2tol(a) (((unsigned)(a/**/_1) << 8) + (unsigned)a/**/_0 ) 1229 #endif 1230 1231 /* 1232 * Ask the drive what it's min and max blk sizes are. 1233 */ 1234 static errval 1235 st_rd_blk_lim(unit, flags) 1236 u_int32_t unit, flags; 1237 { 1238 struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); 1239 struct scsi_data *st = sc_link->sd; 1240 struct scsi_blk_limits scsi_cmd; 1241 struct scsi_blk_limits_data scsi_blkl; 1242 errval errno; 1243 1244 /* 1245 * First check if we have it all loaded 1246 */ 1247 if ((sc_link->flags & SDEV_MEDIA_LOADED)) 1248 return 0; 1249 1250 /* 1251 * do a 'Read Block Limits' 1252 */ 1253 bzero(&scsi_cmd, sizeof(scsi_cmd)); 1254 scsi_cmd.op_code = READ_BLK_LIMITS; 1255 1256 /* 1257 * do the command, update the global values 1258 */ 1259 if ( (errno = scsi_scsi_cmd(sc_link, 1260 (struct scsi_generic *) &scsi_cmd, 1261 sizeof(scsi_cmd), 1262 (u_char *) & scsi_blkl, 1263 sizeof(scsi_blkl), 1264 ST_RETRIES, 1265 5000, 1266 NULL, 1267 flags | SCSI_DATA_IN)) ) { 1268 return errno; 1269 } 1270 st->blkmin = b2tol(scsi_blkl.min_length); 1271 st->blkmax = scsi_3btou(&scsi_blkl.max_length_2); 1272 1273 SC_DEBUG(sc_link, SDEV_DB3, 1274 ("(%ld <= blksiz <= %ld)\n", st->blkmin, st->blkmax)); 1275 return 0; 1276 } 1277 1278 /* 1279 * Get the scsi driver to send a full inquiry to the 1280 * device and use the results to fill out the global 1281 * parameter structure. 1282 * 1283 * called from: 1284 * attach 1285 * open 1286 * ioctl (to reset original blksize) 1287 */ 1288 static errval 1289 st_mode_sense(unit, flags, page, pagelen, pagecode) 1290 u_int32_t unit, flags; 1291 struct tape_pages *page; 1292 u_int32_t pagelen,pagecode; 1293 { 1294 u_int32_t dat_len; 1295 errval errno; 1296 struct scsi_mode_sense scsi_cmd; 1297 struct { 1298 struct scsi_mode_header header; 1299 struct blk_desc blk_desc; 1300 struct tape_pages page; 1301 } dat; 1302 1303 /* Tandberg tape drives returns page 00 1304 * with the sense data, whether or not 1305 * you want it( ie the don't like you 1306 * saying you want anything less!!!!! 1307 * They also expect page 00 1308 * back when you issue a mode select 1309 */ 1310 struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); 1311 struct scsi_data *st = sc_link->sd; 1312 1313 st->flags &= ~ST_SENSE_READ; 1314 /* 1315 * Check if we need to use a default page.. 1316 */ 1317 if ((st->quirks & ST_Q_NEEDS_PAGE_0) && (!page)) { 1318 pagelen = PAGE_0_SENSE_DATA_SIZE; 1319 page = (struct tape_pages *) st->saved_page0; 1320 pagecode = 0; 1321 } 1322 /* 1323 * Now work out the total dat size etc. 1324 */ 1325 dat_len = sizeof(struct scsi_mode_header) 1326 + sizeof(struct blk_desc) 1327 + (page ? pagelen : 0); 1328 /* 1329 * Set up a mode sense 1330 */ 1331 bzero(&scsi_cmd, sizeof(scsi_cmd)); 1332 scsi_cmd.op_code = MODE_SENSE; 1333 scsi_cmd.page = (u_char) pagecode; 1334 scsi_cmd.length = dat_len; 1335 1336 /* 1337 * do the command, 1338 * use the results to set blksiz, numblks and density 1339 * or if we need it as a template for the mode select 1340 * store it away. 1341 */ 1342 if ( (errno = scsi_scsi_cmd(sc_link, 1343 (struct scsi_generic *) &scsi_cmd, 1344 sizeof(scsi_cmd), 1345 (u_char *) &dat, 1346 dat_len, 1347 ST_RETRIES, 1348 5000, 1349 NULL, 1350 flags | SCSI_DATA_IN)) ) { 1351 return errno; 1352 } 1353 st->numblks = scsi_3btou(dat.blk_desc.nblocks); 1354 st->media_blksiz = scsi_3btou(dat.blk_desc.blklen); 1355 st->media_density = dat.blk_desc.density; 1356 if (dat.header.dev_spec & SMH_DSP_WRITE_PROT) { 1357 st->flags |= ST_READONLY; 1358 } 1359 SC_DEBUG(sc_link, SDEV_DB3, 1360 ("density code 0x%lx, %ld-byte blocks, write-%s, ", 1361 st->media_density, st->media_blksiz, 1362 st->flags & ST_READONLY ? "protected" : "enabled")); 1363 SC_DEBUG(sc_link, SDEV_DB3, ("%sbuffered\n", 1364 ((dat.header.dev_spec & SMH_DSP_BUFF_MODE) ? "" : "un"))); 1365 if (page) { 1366 bcopy(&dat.page, page, pagelen); 1367 } 1368 st->flags |= ST_SENSE_READ; 1369 return 0; 1370 } 1371 1372 /* 1373 * Send a filled out parameter structure to the drive to 1374 * set it into the desire modes etc. 1375 */ 1376 static errval 1377 st_mode_select(unit, flags, page, pagelen, byte2) 1378 u_int32_t unit, flags; 1379 struct tape_pages *page; 1380 u_int32_t pagelen; 1381 u_int32_t byte2; 1382 { 1383 u_int32_t dat_len; 1384 struct scsi_mode_select scsi_cmd; 1385 struct { 1386 struct scsi_mode_header header; 1387 struct blk_desc blk_desc; 1388 struct tape_pages page; 1389 } dat; 1390 struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); 1391 struct scsi_data *st = sc_link->sd; 1392 1393 /* 1394 * Check if we need to use a default page.. 1395 * Gee, hope we saved one before now........ 1396 */ 1397 if ((st->quirks & ST_Q_NEEDS_PAGE_0) && (!page)) { 1398 pagelen = PAGE_0_SENSE_DATA_SIZE; 1399 page = (struct tape_pages *) st->saved_page0; 1400 } 1401 /* 1402 * Now work out the total dat size etc. 1403 */ 1404 dat_len = sizeof(struct scsi_mode_header) 1405 + sizeof(struct blk_desc) 1406 + (page ? pagelen : 0); 1407 /* 1408 * Set up for a mode select 1409 */ 1410 bzero(&dat, dat_len); 1411 bzero(&scsi_cmd, sizeof(scsi_cmd)); 1412 scsi_cmd.op_code = MODE_SELECT; 1413 scsi_cmd.length = dat_len; 1414 scsi_cmd.byte2 = (u_char)byte2; 1415 dat.header.blk_desc_len = sizeof(struct blk_desc); 1416 dat.header.dev_spec |= SMH_DSP_BUFF_MODE_ON; 1417 dat.blk_desc.density = st->density; 1418 if (st->flags & ST_FIXEDBLOCKS) { 1419 scsi_uto3b(st->blksiz, dat.blk_desc.blklen); 1420 } 1421 if (page) { 1422 bcopy(page, &dat.page, pagelen); 1423 /* the Tandberg tapes need the block size to */ 1424 /* be set on each mode sense/select. */ 1425 } 1426 /* 1427 * do the command 1428 */ 1429 return (scsi_scsi_cmd(sc_link, 1430 (struct scsi_generic *) &scsi_cmd, 1431 sizeof(scsi_cmd), 1432 (u_char *) &dat, 1433 dat_len, 1434 ST_RETRIES, 1435 5000, 1436 NULL, 1437 flags | SCSI_DATA_OUT)); 1438 } 1439 1440 static int noisy_st = 0; 1441 /***************************************************************\ 1442 * Set the compression mode of the drive to on (1) or off (0) * 1443 still doesn't work! grrr! 1444 \***************************************************************/ 1445 static errval 1446 st_comp(unit,mode) 1447 u_int32_t unit,mode; 1448 { 1449 struct tape_pages page; 1450 int pagesize; 1451 int retval; 1452 struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); 1453 struct scsi_data *st = sc_link->sd; 1454 1455 bzero(&page, sizeof(page)); 1456 pagesize = sizeof(page.pages.configuration) + PAGE_HEADERLEN; 1457 1458 if ( (retval = st_mode_sense(unit, 0, 1459 &page, pagesize, ST_PAGE_CONFIGURATION)) ) 1460 { 1461 printf("sense returned an error of %d\n",retval); 1462 return retval; 1463 } 1464 if ( noisy_st) 1465 printf("drive reports value of %d, setting %ld\n", 1466 page.pages.configuration.data_compress_alg,mode); 1467 1468 page.pg_code &= ST_P_CODE; 1469 page.pg_length = sizeof(page.pages.configuration); 1470 1471 switch(mode) 1472 { 1473 case 0: 1474 page.pages.configuration.data_compress_alg = 0; 1475 break; 1476 case 1: 1477 page.pages.configuration.data_compress_alg = 1; 1478 break; 1479 default: 1480 printf("st%ld: bad value for compression mode\n",unit); 1481 return EINVAL; 1482 } 1483 /* 1484 * send ST_PAGE_CONFIGURATION page as SCSI-II command because it 1485 * is a SCSI-II structure. This requires the PF bit (0x10) to be 1486 * set for byte2. 1487 */ 1488 if ( (retval = st_mode_select(unit, 0, &page, pagesize, 0x10)) ) 1489 { 1490 printf("select returned an error of %d\n",retval); 1491 return retval; 1492 } 1493 st->comp = mode; 1494 return 0; 1495 } 1496 /* 1497 * skip N blocks/filemarks/seq filemarks/eom 1498 */ 1499 static errval 1500 st_space(unit, number, what, flags) 1501 u_int32_t unit, what, flags; 1502 int32_t number; 1503 { 1504 errval error; 1505 struct scsi_space scsi_cmd; 1506 struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); 1507 struct scsi_data *st = sc_link->sd; 1508 1509 switch ((int)what) { 1510 case SP_BLKS: 1511 if (st->flags & ST_PER_ACTION) { 1512 if (number > 0) { 1513 st->flags &= ~ST_PER_ACTION; 1514 return (EIO); 1515 } else if (number < 0) { 1516 if (st->flags & ST_AT_FILEMARK) { 1517 /* 1518 * Handling of ST_AT_FILEMARK 1519 * in st_space will fill in the 1520 * right file mark count. 1521 */ 1522 error = st_space(unit, 0, SP_FILEMARKS, 1523 flags); 1524 if (error) 1525 return (error); 1526 } 1527 if (st->flags & ST_BLANK_READ) { 1528 st->flags &= ~ST_BLANK_READ; 1529 return (EIO); 1530 } 1531 st->flags &= ~ST_EIO_PENDING; 1532 } 1533 } 1534 break; 1535 case SP_FILEMARKS: 1536 if (st->flags & ST_EIO_PENDING) { 1537 if (number > 0) { /* pretend we just discover the error */ 1538 st->flags &= ~ST_EIO_PENDING; 1539 return (EIO); 1540 } else if (number < 0) { /* back away from the error */ 1541 st->flags &= ~ST_EIO_PENDING; 1542 } 1543 } 1544 if (st->flags & ST_AT_FILEMARK) { 1545 st->flags &= ~ST_AT_FILEMARK; 1546 number--; 1547 } 1548 if ((st->flags & ST_BLANK_READ) && (number < 0)) { /* back away from unwritten tape */ 1549 st->flags &= ~ST_BLANK_READ; 1550 number++; /* dubious */ 1551 } 1552 break; 1553 case SP_EOM: 1554 if (st->flags & ST_EIO_PENDING) 1555 { 1556 /* we are already at EOM */ 1557 st->flags &= ~ST_EIO_PENDING; 1558 return(ESUCCESS); 1559 } 1560 number = 1; /* we have only one end-of-medium */ 1561 break; 1562 } 1563 if (number == 0) { 1564 return (ESUCCESS); 1565 } 1566 bzero(&scsi_cmd, sizeof(scsi_cmd)); 1567 scsi_cmd.op_code = SPACE; 1568 scsi_cmd.byte2 = what & SS_CODE; 1569 scsi_uto3b(number, scsi_cmd.number); 1570 return (scsi_scsi_cmd(sc_link, 1571 (struct scsi_generic *) &scsi_cmd, 1572 sizeof(scsi_cmd), 1573 0, 1574 0, 1575 0, /* no retries please , just fail */ 1576 3600000, /* wait up to an hour for completion */ 1577 NULL, 1578 flags)); 1579 } 1580 1581 /* 1582 * write N filemarks 1583 */ 1584 static errval 1585 st_write_filemarks(unit, number, flags) 1586 u_int32_t unit, flags; 1587 int32_t number; 1588 { 1589 struct scsi_write_filemarks scsi_cmd; 1590 struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); 1591 struct scsi_data *st = sc_link->sd; 1592 1593 /* 1594 * It's hard to write a negative number of file marks. 1595 * Don't try. 1596 */ 1597 if (number < 0) { 1598 return EINVAL; 1599 } 1600 switch ((int)number) { 1601 case 0: /* really a command to sync the drive's buffers */ 1602 break; 1603 case 1: 1604 if (st->flags & ST_FM_WRITTEN) { /* already have one down */ 1605 st->flags &= ~ST_WRITTEN; 1606 } else { 1607 st->flags |= ST_FM_WRITTEN; 1608 } 1609 st->flags &= ~ST_PER_ACTION; 1610 break; 1611 default: 1612 st->flags &= ~(ST_PER_ACTION | ST_WRITTEN); 1613 } 1614 bzero(&scsi_cmd, sizeof(scsi_cmd)); 1615 scsi_cmd.op_code = WRITE_FILEMARKS; 1616 scsi_uto3b(number, scsi_cmd.number); 1617 return scsi_scsi_cmd(sc_link, 1618 (struct scsi_generic *) &scsi_cmd, 1619 sizeof(scsi_cmd), 1620 0, 1621 0, 1622 0, /* no retries, just fail */ 1623 100000, /* 10 secs.. (may need to repos head ) */ 1624 NULL, 1625 flags); 1626 } 1627 1628 /* 1629 * Make sure the right number of file marks is on tape if the 1630 * tape has been written. If the position argument is true, 1631 * leave the tape positioned where it was originally. 1632 * 1633 * nmarks returns the number of marks to skip (or, if position 1634 * true, which were skipped) to get back original position. 1635 */ 1636 static int32_t 1637 st_chkeod(unit, position, nmarks, flags) 1638 u_int32_t unit; 1639 boolean position; 1640 int32_t *nmarks; 1641 u_int32_t flags; 1642 { 1643 errval error; 1644 struct scsi_data *st = SCSI_DATA(&st_switch, unit); 1645 1646 switch ((int)(st->flags & (ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD))) { 1647 default: 1648 *nmarks = 0; 1649 return (ESUCCESS); 1650 case ST_WRITTEN: 1651 case ST_WRITTEN | ST_FM_WRITTEN | ST_2FM_AT_EOD: 1652 *nmarks = 1; 1653 break; 1654 case ST_WRITTEN | ST_2FM_AT_EOD: 1655 *nmarks = 2; 1656 } 1657 error = st_write_filemarks(unit, *nmarks, flags); 1658 if (position && (error == ESUCCESS)) 1659 error = st_space(unit, -*nmarks, SP_FILEMARKS, flags); 1660 return (error); 1661 } 1662 1663 /* 1664 * load/unload (with retension if true) 1665 */ 1666 static errval 1667 st_load(unit, type, flags) 1668 u_int32_t unit, type, flags; 1669 { 1670 struct scsi_load scsi_cmd; 1671 struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); 1672 struct scsi_data *st = sc_link->sd; 1673 1674 bzero(&scsi_cmd, sizeof(scsi_cmd)); 1675 if (type != LD_LOAD) { 1676 errval error; 1677 int32_t nmarks; 1678 1679 error = st_chkeod(unit, FALSE, &nmarks, flags); 1680 if (error != ESUCCESS) 1681 return (error); 1682 sc_link->flags &= ~SDEV_MEDIA_LOADED; 1683 } 1684 if (st->quirks & ST_Q_IGNORE_LOADS) 1685 return (0); 1686 scsi_cmd.op_code = LOAD_UNLOAD; 1687 scsi_cmd.how |= type; 1688 return (scsi_scsi_cmd(sc_link, 1689 (struct scsi_generic *) &scsi_cmd, 1690 sizeof(scsi_cmd), 1691 0, 1692 0, 1693 ST_RETRIES, 1694 900000, /* 15 min */ 1695 NULL, 1696 flags)); 1697 } 1698 1699 /* 1700 * Rewind the device 1701 */ 1702 static errval 1703 st_rewind(unit, immed, flags) 1704 u_int32_t unit, flags; 1705 boolean immed; 1706 { 1707 struct scsi_rewind scsi_cmd; 1708 struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); 1709 struct scsi_data *st = sc_link->sd; 1710 errval error; 1711 int32_t nmarks; 1712 1713 error = st_chkeod(unit, FALSE, &nmarks, flags); 1714 if (error != ESUCCESS) 1715 return (error); 1716 st->flags &= ~ST_PER_ACTION; 1717 bzero(&scsi_cmd, sizeof(scsi_cmd)); 1718 scsi_cmd.op_code = REWIND; 1719 scsi_cmd.byte2 = immed ? SR_IMMED : 0; 1720 return (scsi_scsi_cmd(sc_link, 1721 (struct scsi_generic *) &scsi_cmd, 1722 sizeof(scsi_cmd), 1723 0, 1724 0, 1725 ST_RETRIES, 1726 immed ? 5000 : 300000, /* 5 sec or 5 min */ 1727 NULL, 1728 flags)); 1729 } 1730 1731 /* 1732 ** Erase the device 1733 */ 1734 static errval 1735 st_erase(unit, immed, flags) 1736 u_int32_t unit, flags; 1737 boolean immed; 1738 { 1739 struct scsi_erase scsi_cmd; 1740 struct scsi_link *sc_link = SCSI_LINK(&st_switch, unit); 1741 struct scsi_data *st = sc_link->sd; 1742 errval error; 1743 int32_t nmarks; 1744 1745 error = st_chkeod(unit, FALSE, &nmarks, flags); 1746 if (error != ESUCCESS) 1747 return (error); 1748 /* 1749 ** Archive Viper 2525 technical manual 5.7 (ERASE 19h): 1750 ** tape has to be positioned to BOT first before erase command 1751 ** is issued or command is rejected. So we rewind the tape first 1752 ** and exit with an error, if the tape can't be rewinded. 1753 */ 1754 error = st_rewind(unit, FALSE, SCSI_SILENT); 1755 if (error != ESUCCESS) 1756 return (error); 1757 st->flags &= ~ST_PER_ACTION; 1758 bzero(&scsi_cmd, sizeof(scsi_cmd)); 1759 scsi_cmd.op_code = ERASE; 1760 scsi_cmd.byte2 = SE_LONG; /* LONG_ERASE */ 1761 scsi_cmd.byte2 += immed ? SE_IMMED : 0; /* immed bit is here the 2nd! */ 1762 return (scsi_scsi_cmd(sc_link, 1763 (struct scsi_generic *) &scsi_cmd, 1764 sizeof(scsi_cmd), 1765 0, 1766 0, 1767 ST_RETRIES, 1768 immed ? 5000 : (200 * 60 * 1000), /* 5 sec or 200 min */ 1769 NULL, 1770 flags)); 1771 } 1772 1773 /* 1774 * Look at the returned sense and act on the error and detirmine 1775 * The unix error number to pass back... (0 = report no error) 1776 * (SCSIRET_CONTINUE = continue processing) 1777 */ 1778 static errval 1779 st_interpret_sense(xs) 1780 struct scsi_xfer *xs; 1781 { 1782 struct scsi_link *sc_link = xs->sc_link; 1783 struct scsi_sense_data *sense = &(xs->sense); 1784 boolean silent = xs->flags & SCSI_SILENT; 1785 u_int32_t unit = sc_link->dev_unit; 1786 struct scsi_data *st = SCSI_DATA(&st_switch, unit); 1787 u_int32_t key; 1788 int32_t info; 1789 1790 /* 1791 * Get the sense fields and work out what code 1792 */ 1793 if (sense->error_code & SSD_ERRCODE_VALID) { 1794 info = ntohl(*((int32_t *) sense->ext.extended.info)); 1795 } else { 1796 if (st->flags & ST_FIXEDBLOCKS) { 1797 info = xs->datalen / st->blksiz; 1798 } else { 1799 info = xs->datalen; 1800 } 1801 } 1802 1803 key = sense->ext.extended.flags & SSD_KEY; 1804 1805 if (((sense->error_code & SSD_ERRCODE) != 0x70) 1806 || (key == 0x7)) /* Media Write Protected */ { 1807 return SCSIRET_CONTINUE;/* let the generic code handle it */ 1808 } 1809 if(sense->ext.extended.flags & (SSD_EOM|SSD_FILEMARK|SSD_ILI)) { 1810 if (st->flags & ST_FIXEDBLOCKS) { 1811 xs->resid = info * st->blksiz; 1812 xs->flags |= SCSI_RESID_VALID; 1813 if (sense->ext.extended.flags & SSD_EOM) { 1814 st->flags |= ST_EIO_PENDING; 1815 } 1816 if (sense->ext.extended.flags & SSD_FILEMARK) { 1817 st->flags |= ST_AT_FILEMARK; 1818 } 1819 if (sense->ext.extended.flags & SSD_ILI) { 1820 st->flags |= ST_EIO_PENDING; 1821 if (sense->error_code & SSD_ERRCODE_VALID && 1822 !silent) 1823 printf("st%ld: block wrong size" 1824 ", %ld blocks residual\n", unit 1825 ,info); 1826 /*XXX*/ /* is this how it works ? */ 1827 /* check def of ILI for fixed blk tapes */ 1828 1829 /* 1830 * This quirk code helps the drive read 1831 * the first tape block, regardless of 1832 * format. That is required for these 1833 * drives to return proper MODE SENSE 1834 * information. 1835 */ 1836 if ((st->quirks & ST_Q_SNS_HLP) && 1837 !(st->flags & ST_SENSE_READ)) { 1838 st->blksiz -= 512; 1839 } 1840 } 1841 /* 1842 * If no data was tranfered, do it immediatly 1843 */ 1844 if (xs->resid >= xs->datalen) { 1845 xs->flags &= ~SCSI_RESID_VALID; 1846 if (st->flags & ST_AT_FILEMARK) { 1847 xs->flags |= SCSI_EOF; 1848 st->flags &= ~ST_AT_FILEMARK; 1849 return 0; 1850 } 1851 if (st->flags & ST_EIO_PENDING) { 1852 st->flags &= ~ST_EIO_PENDING; 1853 return EIO; 1854 } 1855 } 1856 return 0; 1857 } else { /* must be variable mode */ 1858 xs->resid = xs->datalen; /* to be sure */ 1859 if (sense->ext.extended.flags & SSD_EOM) { 1860 return (EIO); 1861 } 1862 if (sense->ext.extended.flags & SSD_FILEMARK) { 1863 xs->flags |= SCSI_EOF; 1864 } 1865 if (sense->ext.extended.flags & SSD_ILI) { 1866 if (info < 0) { 1867 /* 1868 * the record was bigger than the read 1869 */ 1870 if (!silent) 1871 printf("st%ld: %ld-byte record " 1872 "too big\n", unit, 1873 xs->datalen - info); 1874 return (EIO); 1875 } 1876 xs->resid = info; 1877 xs->flags |= SCSI_RESID_VALID; 1878 } 1879 } 1880 return 0; 1881 } 1882 1883 if (key == 0x8) { 1884 xs->flags |= SCSI_EOF; /* some drives need this */ 1885 /* 1886 * This quirk code helps the drive read the 1887 * first tape block, regardless of format. That 1888 * is required for these drives to return proper 1889 * MODE SENSE information. 1890 */ 1891 if ((st->quirks & ST_Q_SNS_HLP) && 1892 !(st->flags & ST_SENSE_READ)) { 1893 /* still starting */ 1894 st->blksiz -= 512; 1895 } else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) { 1896 st->flags |= ST_BLANK_READ; 1897 xs->flags |= SCSI_EOF; 1898 return (ESUCCESS); 1899 } 1900 } 1901 return SCSIRET_CONTINUE; /* Use the the generic handler */ 1902 } 1903 1904 /* 1905 * The quirk here is that the drive returns some value to st_mode_sense 1906 * incorrectly until the tape has actually passed by the head. 1907 * 1908 * The method is to set the drive to large fixed-block state (user-specified 1909 * density and 1024-byte blocks), then read and rewind to get it to sense the 1910 * tape. If that doesn't work, try 512-byte fixed blocks. If that doesn't 1911 * work, as a last resort, try variable- length blocks. The result will be 1912 * the ability to do an accurate st_mode_sense. 1913 * 1914 * We know we can do a rewind because we just did a load, which implies rewind. 1915 * Rewind seems preferable to space backward if we have a virgin tape. 1916 * 1917 * The rest of the code for this quirk is in ILI processing and BLANK CHECK 1918 * error processing, both part of st_interpret_sense. 1919 */ 1920 static errval 1921 st_touch_tape(unit) 1922 u_int32_t unit; 1923 { 1924 struct scsi_data *st = SCSI_DATA(&st_switch, unit); 1925 char *buf; 1926 u_int32_t readsiz; 1927 errval errno; 1928 1929 buf = malloc(1024, M_TEMP, M_NOWAIT); 1930 if (!buf) 1931 return (ENOMEM); 1932 1933 if (( errno = st_mode_sense(unit, 0, NULL, 0, 0)) ) { 1934 goto bad; 1935 } 1936 st->blksiz = (st->quirks & ST_Q_NO_1024)? 512: 1024; 1937 do { 1938 switch ((int)st->blksiz) { 1939 case 512: 1940 case 1024: 1941 readsiz = st->blksiz; 1942 st->flags |= ST_FIXEDBLOCKS; 1943 break; 1944 default: 1945 readsiz = 1; 1946 st->flags &= ~ST_FIXEDBLOCKS; 1947 } if ( (errno = st_mode_select(unit, 0, NULL, 0, 0)) ) { 1948 goto bad; 1949 } 1950 st_read(unit, buf, readsiz, SCSI_SILENT); 1951 if ( (errno = st_rewind(unit, FALSE, 0)) ) { 1952 bad: free(buf, M_TEMP); 1953 return (errno); 1954 } 1955 } while (readsiz != 1 && readsiz > st->blksiz); 1956 free(buf, M_TEMP); 1957 return 0; 1958 } 1959 1960 static st_devsw_installed = 0; 1961 1962 static void 1963 st_drvinit(void *unused) 1964 { 1965 1966 if( ! st_devsw_installed ) { 1967 bdevsw_add_generic(BDEV_MAJOR, CDEV_MAJOR, &st_bdevsw); 1968 st_devsw_installed = 1; 1969 } 1970 } 1971 1972 SYSINIT(stdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,st_drvinit,NULL) 1973 1974
Cache object: 18f4ef95e89177848e5cc75fecd7d863
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