mt.c revision 1.8
1 /* $NetBSD: mt.c,v 1.8 1997/03/31 07:37:29 scottr Exp $ */ 2 3 /* 4 * Copyright (c) 1996, 1997 Jason R. Thorpe. All rights reserved. 5 * Copyright (c) 1992, The University of Utah and 6 * the Computer Systems Laboratory at the University of Utah (CSL). 7 * All rights reserved. 8 * 9 * Permission to use, copy, modify and distribute this software is hereby 10 * granted provided that (1) source code retains these copyright, permission, 11 * and disclaimer notices, and (2) redistributions including binaries 12 * reproduce the notices in supporting documentation, and (3) all advertising 13 * materials mentioning features or use of this software display the following 14 * acknowledgement: ``This product includes software developed by the 15 * Computer Systems Laboratory at the University of Utah.'' 16 * 17 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS 18 * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF 19 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 20 * 21 * CSL requests users of this software to return to csl-dist (at) cs.utah.edu any 22 * improvements that they make and grant CSL redistribution rights. 23 * 24 * Utah $Hdr: mt.c 1.8 95/09/12$ 25 */ 26 /* @(#)mt.c 3.9 90/07/10 mt Xinu 27 * 28 * Magnetic tape driver (7974a, 7978a/b, 7979a, 7980a, 7980xc) 29 * Original version contributed by Mt. Xinu. 30 * Modified for 4.4BSD by Mark Davies and Andrew Vignaux, Department of 31 * Computer Science, Victoria University of Wellington 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/buf.h> 37 #include <sys/ioctl.h> 38 #include <sys/mtio.h> 39 #include <sys/file.h> 40 #include <sys/proc.h> 41 #include <sys/errno.h> 42 #include <sys/syslog.h> 43 #include <sys/tty.h> 44 #include <sys/kernel.h> 45 #include <sys/tprintf.h> 46 #include <sys/device.h> 47 #include <sys/conf.h> 48 49 #include <hp300/dev/hpibvar.h> 50 51 #include <hp300/dev/mtreg.h> 52 53 struct mtinfo { 54 u_short hwid; 55 char *desc; 56 } mtinfo[] = { 57 { MT7978ID, "7978" }, 58 { MT7979AID, "7979A" }, 59 { MT7980ID, "7980" }, 60 { MT7974AID, "7974A" }, 61 }; 62 int nmtinfo = sizeof(mtinfo) / sizeof(mtinfo[0]); 63 64 struct mt_softc { 65 struct device sc_dev; 66 int sc_hpibno; /* logical HPIB this slave it attached to */ 67 int sc_slave; /* HPIB slave address (0-6) */ 68 short sc_flags; /* see below */ 69 u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */ 70 u_char sc_lastecmd; /* place for End Command in mtreaddsj() */ 71 short sc_recvtimeo; /* count of hpibsend timeouts to prevent hang */ 72 short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */ 73 struct mt_stat sc_stat;/* status bytes last read from device */ 74 short sc_density; /* current density of tape (mtio.h format) */ 75 short sc_type; /* tape drive model (hardware IDs) */ 76 struct hpibqueue sc_hq; /* HPIB device queue member */ 77 tpr_t sc_ttyp; 78 struct buf sc_tab; /* buf queue */ 79 struct buf sc_bufstore; /* XXX buffer storage */ 80 }; 81 82 #ifdef DEBUG 83 int mtdebug = 0; 84 #define dlog if (mtdebug) log 85 #else 86 #define dlog if (0) log 87 #endif 88 89 #define UNIT(x) (minor(x) & 3) 90 91 #define B_CMD B_XXX /* command buf instead of data */ 92 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */ 93 94 int mtmatch __P((struct device *, struct cfdata *, void *)); 95 void mtattach __P((struct device *, struct device *, void *)); 96 97 struct cfattach mt_ca = { 98 sizeof(struct mt_softc), mtmatch, mtattach 99 }; 100 101 struct cfdriver mt_cd = { 102 NULL, "mt", DV_TAPE 103 }; 104 105 int mtident __P((struct mt_softc *, struct hpibbus_attach_args *)); 106 void mtustart __P((struct mt_softc *)); 107 int mtreaddsj __P((struct mt_softc *, int)); 108 int mtcommand __P((dev_t, int, int)); 109 void spl_mtintr __P((void *)); 110 void spl_mtstart __P((void *)); 111 112 void mtstart __P((void *)); 113 void mtgo __P((void *)); 114 void mtintr __P((void *)); 115 116 bdev_decl(mt); 117 cdev_decl(mt); 118 119 int 120 mtmatch(parent, match, aux) 121 struct device *parent; 122 struct cfdata *match; 123 void *aux; 124 { 125 struct hpibbus_attach_args *ha = aux; 126 127 return (mtident(NULL, ha)); 128 } 129 130 void 131 mtattach(parent, self, aux) 132 struct device *parent, *self; 133 void *aux; 134 { 135 struct mt_softc *sc = (struct mt_softc *)self; 136 struct hpibbus_attach_args *ha = aux; 137 int unit, hpibno, slave; 138 139 if (mtident(sc, ha) == 0) { 140 printf("\n%s: impossible!\n", sc->sc_dev.dv_xname); 141 return; 142 } 143 144 unit = self->dv_unit; 145 hpibno = parent->dv_unit; 146 slave = ha->ha_slave; 147 148 sc->sc_tab.b_actb = &sc->sc_tab.b_actf; 149 150 sc->sc_hpibno = hpibno; 151 sc->sc_slave = slave; 152 sc->sc_flags = MTF_EXISTS; 153 154 /* Initialize hpib job queue entry. */ 155 sc->sc_hq.hq_softc = sc; 156 sc->sc_hq.hq_slave = sc->sc_slave; 157 sc->sc_hq.hq_start = mtstart; 158 sc->sc_hq.hq_go = mtgo; 159 sc->sc_hq.hq_intr = mtintr; 160 } 161 162 int 163 mtident(sc, ha) 164 struct mt_softc *sc; 165 struct hpibbus_attach_args *ha; 166 { 167 int i; 168 169 for (i = 0; i < nmtinfo; i++) { 170 if (ha->ha_id == mtinfo[i].hwid) { 171 if (sc != NULL) { 172 sc->sc_type = mtinfo[i].hwid; 173 printf(": %s tape\n", mtinfo[i].desc); 174 } 175 return (1); 176 } 177 } 178 return (0); 179 } 180 181 /* 182 * Perform a read of "Device Status Jump" register and update the 183 * status if necessary. If status is read, the given "ecmd" is also 184 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 185 * and -2 on "temporary" failure. 186 */ 187 int 188 mtreaddsj(sc, ecmd) 189 struct mt_softc *sc; 190 int ecmd; 191 { 192 int retval; 193 194 if (sc->sc_flags & MTF_STATTIMEO) 195 goto getstats; 196 retval = hpibrecv(sc->sc_hpibno, 197 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 198 MTT_DSJ, &(sc->sc_lastdsj), 1); 199 sc->sc_flags &= ~MTF_DSJTIMEO; 200 if (retval != 1) { 201 dlog(LOG_DEBUG, "%s can't hpibrecv DSJ", 202 sc->sc_dev.dv_xname); 203 if (sc->sc_recvtimeo == 0) 204 sc->sc_recvtimeo = hz; 205 if (--sc->sc_recvtimeo == 0) 206 return (-1); 207 if (retval == 0) 208 sc->sc_flags |= MTF_DSJTIMEO; 209 return (-2); 210 } 211 sc->sc_recvtimeo = 0; 212 sc->sc_statindex = 0; 213 dlog(LOG_DEBUG, "%s readdsj: 0x%x", sc->sc_dev.dv_xname, 214 sc->sc_lastdsj); 215 sc->sc_lastecmd = ecmd; 216 switch (sc->sc_lastdsj) { 217 case 0: 218 if (ecmd & MTE_DSJ_FORCE) 219 break; 220 return (0); 221 222 case 2: 223 sc->sc_lastecmd = MTE_COMPLETE; 224 case 1: 225 break; 226 227 default: 228 log(LOG_ERR, "%s readdsj: DSJ 0x%x\n", sc->sc_dev.dv_xname, 229 sc->sc_lastdsj); 230 return (-1); 231 } 232 getstats: 233 retval = hpibrecv(sc->sc_hpibno, 234 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, 235 MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex, 236 sizeof(sc->sc_stat) - sc->sc_statindex); 237 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 238 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 239 if (sc->sc_recvtimeo == 0) 240 sc->sc_recvtimeo = hz; 241 if (--sc->sc_recvtimeo != 0) { 242 if (retval >= 0) { 243 sc->sc_statindex += retval; 244 sc->sc_flags |= MTF_STATCONT; 245 } 246 sc->sc_flags |= MTF_STATTIMEO; 247 return (-2); 248 } 249 log(LOG_ERR, "%s readdsj: can't read status", 250 sc->sc_dev.dv_xname); 251 return (-1); 252 } 253 sc->sc_recvtimeo = 0; 254 sc->sc_statindex = 0; 255 dlog(LOG_DEBUG, "%s readdsj: status is %x %x %x %x %x %x", 256 sc->sc_dev.dv_xname, 257 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 258 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6); 259 if (sc->sc_lastecmd) 260 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, 261 MTL_ECMD, &(sc->sc_lastecmd), 1); 262 return ((int) sc->sc_lastdsj); 263 } 264 265 int 266 mtopen(dev, flag, mode, p) 267 dev_t dev; 268 int flag, mode; 269 struct proc *p; 270 { 271 int unit = UNIT(dev); 272 struct mt_softc *sc; 273 int req_den; 274 int error; 275 276 if (unit >= mt_cd.cd_ndevs || 277 (sc = mt_cd.cd_devs[unit]) == NULL || 278 (sc->sc_flags & MTF_EXISTS) == 0) 279 return (ENXIO); 280 281 dlog(LOG_DEBUG, "%s open: flags 0x%x", sc->sc_dev.dv_xname, 282 sc->sc_flags); 283 if (sc->sc_flags & MTF_OPEN) 284 return (EBUSY); 285 sc->sc_flags |= MTF_OPEN; 286 sc->sc_ttyp = tprintf_open(p); 287 if ((sc->sc_flags & MTF_ALIVE) == 0) { 288 error = mtcommand(dev, MTRESET, 0); 289 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 290 goto errout; 291 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 292 (void) mtcommand(dev, MTREW, 0); 293 } 294 for (;;) { 295 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 296 goto errout; 297 if (!(sc->sc_flags & MTF_REW)) 298 break; 299 if (tsleep((caddr_t) &lbolt, PCATCH | (PZERO + 1), 300 "mt", 0) != 0) { 301 error = EINTR; 302 goto errout; 303 } 304 } 305 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 306 error = EROFS; 307 goto errout; 308 } 309 if (!(sc->sc_stat1 & SR1_ONLINE)) { 310 uprintf("%s: not online\n", sc->sc_dev.dv_xname); 311 error = EIO; 312 goto errout; 313 } 314 /* 315 * Select density: 316 * - find out what density the drive is set to 317 * (i.e. the density of the current tape) 318 * - if we are going to write 319 * - if we're not at the beginning of the tape 320 * - complain if we want to change densities 321 * - otherwise, select the mtcommand to set the density 322 * 323 * If the drive doesn't support it then don't change the recorded 324 * density. 325 * 326 * The original MOREbsd code had these additional conditions 327 * for the mid-tape change 328 * 329 * req_den != T_BADBPI && 330 * sc->sc_density != T_6250BPI 331 * 332 * which suggests that it would be possible to write multiple 333 * densities if req_den == T_BAD_BPI or the current tape 334 * density was 6250. Testing of our 7980 suggests that the 335 * device cannot change densities mid-tape. 336 * 337 * ajv (at) comp.vuw.ac.nz 338 */ 339 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 340 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 341 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 342 req_den = (dev & T_DENSEL); 343 344 if (flag & FWRITE) { 345 if (!(sc->sc_stat1 & SR1_BOT)) { 346 if (sc->sc_density != req_den) { 347 uprintf("%s: can't change density mid-tape\n", 348 sc->sc_dev.dv_xname); 349 error = EIO; 350 goto errout; 351 } 352 } 353 else { 354 int mtset_density = 355 (req_den == T_800BPI ? MTSET800BPI : ( 356 req_den == T_1600BPI ? MTSET1600BPI : ( 357 req_den == T_6250BPI ? MTSET6250BPI : ( 358 sc->sc_type == MT7980ID 359 ? MTSET6250DC 360 : MTSET6250BPI)))); 361 if (mtcommand(dev, mtset_density, 0) == 0) 362 sc->sc_density = req_den; 363 } 364 } 365 return (0); 366 errout: 367 sc->sc_flags &= ~MTF_OPEN; 368 return (error); 369 } 370 371 int 372 mtclose(dev, flag, fmt, p) 373 dev_t dev; 374 int flag, fmt; 375 struct proc *p; 376 { 377 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 378 379 if (sc->sc_flags & MTF_WRT) { 380 (void) mtcommand(dev, MTWEOF, 2); 381 (void) mtcommand(dev, MTBSF, 0); 382 } 383 if ((minor(dev) & T_NOREWIND) == 0) 384 (void) mtcommand(dev, MTREW, 0); 385 sc->sc_flags &= ~MTF_OPEN; 386 tprintf_close(sc->sc_ttyp); 387 return (0); 388 } 389 390 int 391 mtcommand(dev, cmd, cnt) 392 dev_t dev; 393 int cmd; 394 int cnt; 395 { 396 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 397 struct buf *bp = &sc->sc_bufstore; 398 int error = 0; 399 400 #if 1 401 if (bp->b_flags & B_BUSY) 402 return (EBUSY); 403 #endif 404 bp->b_cmd = cmd; 405 bp->b_dev = dev; 406 do { 407 bp->b_flags = B_BUSY | B_CMD; 408 mtstrategy(bp); 409 iowait(bp); 410 if (bp->b_flags & B_ERROR) { 411 error = (int) (unsigned) bp->b_error; 412 break; 413 } 414 } while (--cnt > 0); 415 #if 0 416 bp->b_flags = 0 /*&= ~B_BUSY*/; 417 #else 418 bp->b_flags &= ~B_BUSY; 419 #endif 420 return (error); 421 } 422 423 /* 424 * Only thing to check here is for legal record lengths (writes only). 425 */ 426 void 427 mtstrategy(bp) 428 struct buf *bp; 429 { 430 struct mt_softc *sc; 431 struct buf *dp; 432 int unit; 433 int s; 434 435 unit = UNIT(bp->b_dev); 436 sc = mt_cd.cd_devs[unit]; 437 dlog(LOG_DEBUG, "%s strategy", sc->sc_dev.dv_xname); 438 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 439 #define WRITE_BITS_IGNORED 8 440 #if 0 441 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 442 tprintf(sc->sc_ttyp, 443 "%s: write record must be multiple of %d\n", 444 sc->sc_dev.dv_xname, 1 << WRITE_BITS_IGNORED); 445 goto error; 446 } 447 #endif 448 s = 16 * 1024; 449 if (sc->sc_stat2 & SR2_LONGREC) { 450 switch (sc->sc_density) { 451 case T_1600BPI: 452 s = 32 * 1024; 453 break; 454 455 case T_6250BPI: 456 case T_BADBPI: 457 s = 60 * 1024; 458 break; 459 } 460 } 461 if (bp->b_bcount > s) { 462 tprintf(sc->sc_ttyp, 463 "%s: write record (%ld) too big: limit (%d)\n", 464 sc->sc_dev.dv_xname, bp->b_bcount, s); 465 #if 0 /* XXX see above */ 466 error: 467 #endif 468 bp->b_flags |= B_ERROR; 469 bp->b_error = EIO; 470 iodone(bp); 471 return; 472 } 473 } 474 dp = &sc->sc_tab; 475 bp->b_actf = NULL; 476 s = splbio(); 477 bp->b_actb = dp->b_actb; 478 *dp->b_actb = bp; 479 dp->b_actb = &bp->b_actf; 480 if (dp->b_active == 0) { 481 dp->b_active = 1; 482 mtustart(sc); 483 } 484 splx(s); 485 } 486 487 void 488 mtustart(sc) 489 struct mt_softc *sc; 490 { 491 492 dlog(LOG_DEBUG, "%s ustart", sc->sc_dev.dv_xname); 493 if (hpibreq(sc->sc_dev.dv_parent, &sc->sc_hq)) 494 mtstart(sc); 495 } 496 497 void 498 spl_mtintr(arg) 499 void *arg; 500 { 501 struct mt_softc *sc = arg; 502 int s = splbio(); 503 504 hpibppclear(sc->sc_hpibno); 505 mtintr(sc); 506 (void) splx(s); 507 } 508 509 void 510 spl_mtstart(arg) 511 void *arg; 512 { 513 int s = splbio(); 514 515 mtstart(arg); 516 (void) splx(s); 517 } 518 519 void 520 mtstart(arg) 521 void *arg; 522 { 523 struct mt_softc *sc = arg; 524 struct buf *bp, *dp; 525 short cmdcount = 1; 526 u_char cmdbuf[2]; 527 528 dlog(LOG_DEBUG, "%s start", sc->sc_dev.dv_xname); 529 sc->sc_flags &= ~MTF_WRT; 530 bp = sc->sc_tab.b_actf; 531 if ((sc->sc_flags & MTF_ALIVE) == 0 && 532 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 533 goto fatalerror; 534 535 if (sc->sc_flags & MTF_REW) { 536 if (!hpibpptest(sc->sc_hpibno, sc->sc_slave)) 537 goto stillrew; 538 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 539 case 0: 540 case 1: 541 stillrew: 542 if ((sc->sc_stat1 & SR1_BOT) || 543 !(sc->sc_stat1 & SR1_ONLINE)) { 544 sc->sc_flags &= ~MTF_REW; 545 break; 546 } 547 case -2: 548 /* 549 * -2 means "timeout" reading DSJ, which is probably 550 * temporary. This is considered OK when doing a NOP, 551 * but not otherwise. 552 */ 553 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 554 timeout(spl_mtstart, sc, hz >> 5); 555 return; 556 } 557 case 2: 558 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 559 bp->b_error = EBUSY; 560 goto errdone; 561 } 562 goto done; 563 564 default: 565 goto fatalerror; 566 } 567 } 568 if (bp->b_flags & B_CMD) { 569 if (sc->sc_flags & MTF_PASTEOT) { 570 switch(bp->b_cmd) { 571 case MTFSF: 572 case MTWEOF: 573 case MTFSR: 574 bp->b_error = ENOSPC; 575 goto errdone; 576 577 case MTBSF: 578 case MTOFFL: 579 case MTBSR: 580 case MTREW: 581 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 582 break; 583 } 584 } 585 switch(bp->b_cmd) { 586 case MTFSF: 587 if (sc->sc_flags & MTF_HITEOF) 588 goto done; 589 cmdbuf[0] = MTTC_FSF; 590 break; 591 592 case MTBSF: 593 if (sc->sc_flags & MTF_HITBOF) 594 goto done; 595 cmdbuf[0] = MTTC_BSF; 596 break; 597 598 case MTOFFL: 599 sc->sc_flags |= MTF_REW; 600 cmdbuf[0] = MTTC_REWOFF; 601 break; 602 603 case MTWEOF: 604 cmdbuf[0] = MTTC_WFM; 605 break; 606 607 case MTBSR: 608 cmdbuf[0] = MTTC_BSR; 609 break; 610 611 case MTFSR: 612 cmdbuf[0] = MTTC_FSR; 613 break; 614 615 case MTREW: 616 sc->sc_flags |= MTF_REW; 617 cmdbuf[0] = MTTC_REW; 618 break; 619 620 case MTNOP: 621 /* 622 * NOP is supposed to set status bits. 623 * Force readdsj to do it. 624 */ 625 switch (mtreaddsj(sc, 626 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 627 default: 628 goto done; 629 630 case -1: 631 /* 632 * If this fails, perform a device clear 633 * to fix any protocol problems and (most 634 * likely) get the status. 635 */ 636 bp->b_cmd = MTRESET; 637 break; 638 639 case -2: 640 timeout(spl_mtstart, sc, hz >> 5); 641 return; 642 } 643 644 case MTRESET: 645 /* 646 * 1) selected device clear (send with "-2" secondary) 647 * 2) set timeout, then wait for "service request" 648 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 649 */ 650 if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){ 651 log(LOG_ERR, "%s can't reset", 652 sc->sc_dev.dv_xname); 653 goto fatalerror; 654 } 655 timeout(spl_mtintr, sc, 4 * hz); 656 hpibawait(sc->sc_hpibno); 657 return; 658 659 case MTSET800BPI: 660 cmdbuf[0] = MTTC_800; 661 break; 662 663 case MTSET1600BPI: 664 cmdbuf[0] = MTTC_1600; 665 break; 666 667 case MTSET6250BPI: 668 cmdbuf[0] = MTTC_6250; 669 break; 670 671 case MTSET6250DC: 672 cmdbuf[0] = MTTC_DC6250; 673 break; 674 } 675 } else { 676 if (sc->sc_flags & MTF_PASTEOT) { 677 bp->b_error = ENOSPC; 678 goto errdone; 679 } 680 if (bp->b_flags & B_READ) { 681 sc->sc_flags |= MTF_IO; 682 cmdbuf[0] = MTTC_READ; 683 } else { 684 sc->sc_flags |= MTF_WRT | MTF_IO; 685 cmdbuf[0] = MTTC_WRITE; 686 cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 687 cmdcount = 2; 688 } 689 } 690 if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 691 == cmdcount) { 692 if (sc->sc_flags & MTF_REW) 693 goto done; 694 hpibawait(sc->sc_hpibno); 695 return; 696 } 697 fatalerror: 698 /* 699 * If anything fails, the drive is probably hosed, so mark it not 700 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 701 * if, last we heard, it was REWinding, remember that). 702 */ 703 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 704 bp->b_error = EIO; 705 errdone: 706 bp->b_flags |= B_ERROR; 707 done: 708 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 709 iodone(bp); 710 if ((dp = bp->b_actf)) 711 dp->b_actb = bp->b_actb; 712 else 713 sc->sc_tab.b_actb = bp->b_actb; 714 *bp->b_actb = dp; 715 hpibfree(sc->sc_dev.dv_parent, &sc->sc_hq); 716 if ((bp = dp) == NULL) 717 sc->sc_tab.b_active = 0; 718 else 719 mtustart(sc); 720 } 721 722 /* 723 * The Utah code had a bug which meant that the driver was unable to read. 724 * "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized. 725 * -- ajv (at) comp.vuw.ac.nz 726 */ 727 void 728 mtgo(arg) 729 void *arg; 730 { 731 struct mt_softc *sc = arg; 732 struct buf *bp; 733 int rw; 734 735 dlog(LOG_DEBUG, "%s go", sc->sc_dev.dv_xname); 736 bp = sc->sc_tab.b_actf; 737 rw = bp->b_flags & B_READ; 738 hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE, 739 bp->b_un.b_addr, bp->b_bcount, rw, rw != 0); 740 } 741 742 void 743 mtintr(arg) 744 void *arg; 745 { 746 struct mt_softc *sc = arg; 747 struct buf *bp, *dp; 748 int i; 749 u_char cmdbuf[4]; 750 751 bp = sc->sc_tab.b_actf; 752 if (bp == NULL) { 753 log(LOG_ERR, "%s intr: bp == NULL", sc->sc_dev.dv_xname); 754 return; 755 } 756 757 dlog(LOG_DEBUG, "%s intr", sc->sc_dev.dv_xname); 758 759 /* 760 * Some operation completed. Read status bytes and report errors. 761 * Clear EOF flags here `cause they're set once on specific conditions 762 * below when a command succeeds. 763 * A DSJ of 2 always means keep waiting. If the command was READ 764 * (and we're in data DMA phase) stop data transfer first. 765 */ 766 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 767 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 768 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 769 cmdbuf[0] = MTE_STOP; 770 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1); 771 } 772 switch (mtreaddsj(sc, 0)) { 773 case 0: 774 break; 775 776 case 1: 777 /* 778 * If we're in the middle of a READ/WRITE and have yet to 779 * start the data transfer, a DSJ of one should terminate it. 780 */ 781 sc->sc_flags &= ~MTF_IO; 782 break; 783 784 case 2: 785 (void) hpibawait(sc->sc_hpibno); 786 return; 787 788 case -2: 789 /* 790 * -2 means that the drive failed to respond quickly enough 791 * to the request for DSJ. It's probably just "busy" figuring 792 * it out and will know in a little bit... 793 */ 794 timeout(spl_mtintr, sc, hz >> 5); 795 return; 796 797 default: 798 log(LOG_ERR, "%s intr: can't get drive stat", 799 sc->sc_dev.dv_xname); 800 goto error; 801 } 802 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 803 i = sc->sc_stat4 & SR4_ERCLMASK; 804 log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d", 805 sc->sc_dev.dv_xname, i == SR4_DEVICE ? "device" : 806 (i == SR4_PROTOCOL ? "protocol" : 807 (i == SR4_SELFTEST ? "selftest" : "unknown")), 808 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 809 sc->sc_stat3, sc->sc_stat5); 810 811 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 812 untimeout(spl_mtintr, sc); 813 if (sc->sc_stat3 & SR3_POWERUP) 814 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 815 goto error; 816 } 817 /* 818 * Report and clear any soft errors. 819 */ 820 if (sc->sc_stat1 & SR1_SOFTERR) { 821 log(LOG_WARNING, "%s: soft error, retry %d\n", 822 sc->sc_dev.dv_xname, sc->sc_stat4 & SR4_RETRYMASK); 823 sc->sc_stat1 &= ~SR1_SOFTERR; 824 } 825 /* 826 * We've initiated a read or write, but haven't actually started to 827 * DMA the data yet. At this point, the drive's ready. 828 */ 829 if (sc->sc_flags & MTF_IO) { 830 sc->sc_flags &= ~MTF_IO; 831 if (hpibustart(sc->sc_hpibno)) 832 mtgo(sc); 833 return; 834 } 835 /* 836 * Check for End Of Tape - we're allowed to hit EOT and then write (or 837 * read) one more record. If we get here and have not already hit EOT, 838 * return ENOSPC to inform the process that it's hit it. If we get 839 * here and HAVE already hit EOT, don't allow any more operations that 840 * move the tape forward. 841 */ 842 if (sc->sc_stat1 & SR1_EOT) { 843 if (sc->sc_flags & MTF_ATEOT) 844 sc->sc_flags |= MTF_PASTEOT; 845 else { 846 bp->b_flags |= B_ERROR; 847 bp->b_error = ENOSPC; 848 sc->sc_flags |= MTF_ATEOT; 849 } 850 } 851 /* 852 * If a motion command was being executed, check for Tape Marks. 853 * If we were doing data, make sure we got the right amount, and 854 * check for hitting tape marks on reads. 855 */ 856 if (bp->b_flags & B_CMD) { 857 if (sc->sc_stat1 & SR1_EOF) { 858 if (bp->b_cmd == MTFSR) 859 sc->sc_flags |= MTF_HITEOF; 860 if (bp->b_cmd == MTBSR) 861 sc->sc_flags |= MTF_HITBOF; 862 } 863 if (bp->b_cmd == MTRESET) { 864 untimeout(spl_mtintr, sc); 865 sc->sc_flags |= MTF_ALIVE; 866 } 867 } else { 868 i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2); 869 if (i != 2) { 870 log(LOG_ERR, "%s intr: can't get xfer length\n", 871 sc->sc_dev.dv_xname); 872 goto error; 873 } 874 i = (int) *((u_short *) cmdbuf); 875 if (i <= bp->b_bcount) { 876 if (i == 0) 877 sc->sc_flags |= MTF_HITEOF; 878 bp->b_resid = bp->b_bcount - i; 879 dlog(LOG_DEBUG, "%s intr: bcount %ld, resid %ld", 880 sc->sc_dev.dv_xname, bp->b_bcount, bp->b_resid); 881 } else { 882 tprintf(sc->sc_ttyp, 883 "%s: record (%d) larger than wanted (%ld)\n", 884 sc->sc_dev.dv_xname, i, bp->b_bcount); 885 error: 886 sc->sc_flags &= ~MTF_IO; 887 bp->b_error = EIO; 888 bp->b_flags |= B_ERROR; 889 } 890 } 891 /* 892 * The operation is completely done. 893 * Let the drive know with an END command. 894 */ 895 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 896 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1); 897 bp->b_flags &= ~B_CMD; 898 iodone(bp); 899 if ((dp = bp->b_actf)) 900 dp->b_actb = bp->b_actb; 901 else 902 sc->sc_tab.b_actb = bp->b_actb; 903 *bp->b_actb = dp; 904 hpibfree(sc->sc_dev.dv_parent, &sc->sc_hq); 905 #if 0 906 if (bp /*sc->sc_tab.b_actf*/ == NULL) 907 #else 908 if (sc->sc_tab.b_actf == NULL) 909 #endif 910 sc->sc_tab.b_active = 0; 911 else 912 mtustart(sc); 913 } 914 915 int 916 mtread(dev, uio, flags) 917 dev_t dev; 918 struct uio *uio; 919 int flags; 920 { 921 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 922 923 return(physio(mtstrategy, &sc->sc_bufstore, 924 dev, B_READ, minphys, uio)); 925 } 926 927 int 928 mtwrite(dev, uio, flags) 929 dev_t dev; 930 struct uio *uio; 931 int flags; 932 { 933 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 934 935 return(physio(mtstrategy, &sc->sc_bufstore, 936 dev, B_WRITE, minphys, uio)); 937 } 938 939 int 940 mtioctl(dev, cmd, data, flag, p) 941 dev_t dev; 942 u_long cmd; 943 caddr_t data; 944 int flag; 945 struct proc *p; 946 { 947 struct mtop *op; 948 int cnt; 949 950 switch (cmd) { 951 case MTIOCTOP: 952 op = (struct mtop *)data; 953 switch(op->mt_op) { 954 case MTWEOF: 955 case MTFSF: 956 case MTBSR: 957 case MTBSF: 958 case MTFSR: 959 cnt = op->mt_count; 960 break; 961 962 case MTOFFL: 963 case MTREW: 964 case MTNOP: 965 cnt = 0; 966 break; 967 968 default: 969 return (EINVAL); 970 } 971 return (mtcommand(dev, op->mt_op, cnt)); 972 973 case MTIOCGET: 974 break; 975 976 default: 977 return (EINVAL); 978 } 979 return (0); 980 } 981 982 /*ARGSUSED*/ 983 int 984 mtdump(dev, blkno, va, size) 985 dev_t dev; 986 daddr_t blkno; 987 caddr_t va; 988 size_t size; 989 { 990 return (ENODEV); 991 } 992
Indexes created Wed Sep 24 15:09:51 GMT 2025