mt.c revision 1.1
1 /* $NetBSD: mt.c,v 1.1 1995/10/02 00:28:20 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1992, The University of Utah and 5 * the Computer Systems Laboratory at the University of Utah (CSL). 6 * All rights reserved. 7 * 8 * Permission to use, copy, modify and distribute this software is hereby 9 * granted provided that (1) source code retains these copyright, permission, 10 * and disclaimer notices, and (2) redistributions including binaries 11 * reproduce the notices in supporting documentation, and (3) all advertising 12 * materials mentioning features or use of this software display the following 13 * acknowledgement: ``This product includes software developed by the 14 * Computer Systems Laboratory at the University of Utah.'' 15 * 16 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS 17 * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF 18 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 19 * 20 * CSL requests users of this software to return to csl-dist (at) cs.utah.edu any 21 * improvements that they make and grant CSL redistribution rights. 22 * 23 * Utah $Hdr: mt.c 1.8 95/09/12$ 24 */ 25 /* @(#)mt.c 3.9 90/07/10 mt Xinu 26 * 27 * Magnetic tape driver (7974a, 7978a/b, 7979a, 7980a, 7980xc) 28 * Original version contributed by Mt. Xinu. 29 * Modified for 4.4BSD by Mark Davies and Andrew Vignaux, Department of 30 * Computer Science, Victoria University of Wellington 31 */ 32 #include "mt.h" 33 #if NMT > 0 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/buf.h> 38 #include <sys/ioctl.h> 39 #include <sys/mtio.h> 40 #include <sys/file.h> 41 #include <sys/proc.h> 42 #include <sys/errno.h> 43 #include <sys/syslog.h> 44 #include <sys/tty.h> 45 #include <sys/kernel.h> 46 #include <sys/tprintf.h> 47 48 #include <hp300/dev/device.h> 49 #include <hp300/dev/hpibvar.h> 50 #include <hp300/dev/mtreg.h> 51 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 short sc_hpibno; /* logical HPIB this slave it attached to */ 66 short sc_slave; /* HPIB slave address (0-6) */ 67 short sc_flags; /* see below */ 68 u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */ 69 u_char sc_lastecmd; /* place for End Command in mtreaddsj() */ 70 short sc_recvtimeo; /* count of hpibsend timeouts to prevent hang */ 71 short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */ 72 struct mt_stat sc_stat;/* status bytes last read from device */ 73 short sc_density; /* current density of tape (mtio.h format) */ 74 short sc_type; /* tape drive model (hardware IDs) */ 75 struct devqueue sc_dq; /* HPIB device queue member */ 76 tpr_t sc_ttyp; 77 } mt_softc[NMT]; 78 struct buf mttab[NMT]; 79 struct buf mtbuf[NMT]; 80 81 #ifdef DEBUG 82 int mtdebug = 0; 83 #define dlog if (mtdebug) log 84 #else 85 #define dlog if (0) log 86 #endif 87 88 #define UNIT(x) (minor(x) & 3) 89 90 #define B_CMD B_XXX /* command buf instead of data */ 91 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */ 92 93 int mtinit(), mtintr(); 94 void mtustart(), mtstart(), mtgo(), mtstrategy(); 95 struct driver mtdriver = { 96 mtinit, "mt", (int (*)()) mtstart, (int (*)()) mtgo, mtintr, 97 }; 98 99 mtinit(hd) 100 register struct hp_device *hd; 101 { 102 register int unit; 103 register int hpibno = hd->hp_ctlr; 104 register int slave = hd->hp_slave; 105 register struct mt_softc *sc; 106 register int id; 107 register struct buf *bp; 108 109 for (bp = mttab; bp < &mttab[NMT]; bp++) 110 bp->b_actb = &bp->b_actf; 111 unit = hpibid(hpibno, slave); 112 for (id = 0; id < nmtinfo; id++) 113 if (unit == mtinfo[id].hwid) 114 goto gottype; 115 return (0); /* not a known HP magtape */ 116 117 gottype: 118 unit = hd->hp_unit; 119 sc = &mt_softc[unit]; 120 sc->sc_type = mtinfo[id].hwid; 121 printf("mt%d: %s tape\n", unit, mtinfo[id].desc); 122 123 sc->sc_hpibno = hpibno; 124 sc->sc_slave = slave; 125 sc->sc_flags = MTF_EXISTS; 126 sc->sc_dq.dq_ctlr = hpibno; 127 sc->sc_dq.dq_unit = unit; 128 sc->sc_dq.dq_slave = slave; 129 sc->sc_dq.dq_driver = &mtdriver; 130 return (1); 131 } 132 133 /* 134 * Perform a read of "Device Status Jump" register and update the 135 * status if necessary. If status is read, the given "ecmd" is also 136 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 137 * and -2 on "temporary" failure. 138 */ 139 mtreaddsj(unit, ecmd) 140 register int unit; 141 int ecmd; 142 { 143 register struct mt_softc *sc = &mt_softc[unit]; 144 int retval; 145 146 if (sc->sc_flags & MTF_STATTIMEO) 147 goto getstats; 148 retval = hpibrecv(sc->sc_hpibno, 149 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 150 MTT_DSJ, &(sc->sc_lastdsj), 1); 151 sc->sc_flags &= ~MTF_DSJTIMEO; 152 if (retval != 1) { 153 dlog(LOG_DEBUG, "mt%d can't hpibrecv DSJ\n", unit); 154 if (sc->sc_recvtimeo == 0) 155 sc->sc_recvtimeo = hz; 156 if (--sc->sc_recvtimeo == 0) 157 return (-1); 158 if (retval == 0) 159 sc->sc_flags |= MTF_DSJTIMEO; 160 return (-2); 161 } 162 sc->sc_recvtimeo = 0; 163 sc->sc_statindex = 0; 164 dlog(LOG_DEBUG, "mt%d readdsj: 0x%x\n", unit, sc->sc_lastdsj); 165 sc->sc_lastecmd = ecmd; 166 switch (sc->sc_lastdsj) { 167 case 0: 168 if (ecmd & MTE_DSJ_FORCE) 169 break; 170 return (0); 171 172 case 2: 173 sc->sc_lastecmd = MTE_COMPLETE; 174 case 1: 175 break; 176 177 default: 178 log(LOG_ERR, "mt%d readdsj: DSJ 0x%x\n", unit, sc->sc_lastdsj); 179 return (-1); 180 } 181 getstats: 182 retval = hpibrecv(sc->sc_hpibno, 183 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, 184 MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex, 185 sizeof(sc->sc_stat) - sc->sc_statindex); 186 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 187 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 188 if (sc->sc_recvtimeo == 0) 189 sc->sc_recvtimeo = hz; 190 if (--sc->sc_recvtimeo != 0) { 191 if (retval >= 0) { 192 sc->sc_statindex += retval; 193 sc->sc_flags |= MTF_STATCONT; 194 } 195 sc->sc_flags |= MTF_STATTIMEO; 196 return (-2); 197 } 198 log(LOG_ERR, "mt%d readdsj: can't read status\n", unit); 199 return (-1); 200 } 201 sc->sc_recvtimeo = 0; 202 sc->sc_statindex = 0; 203 dlog(LOG_DEBUG, "mt%d readdsj: status is %x %x %x %x %x %x\n", unit, 204 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 205 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6); 206 if (sc->sc_lastecmd) 207 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, 208 MTL_ECMD, &(sc->sc_lastecmd), 1); 209 return ((int) sc->sc_lastdsj); 210 } 211 212 mtopen(dev, flag, mode, p) 213 dev_t dev; 214 int flag, mode; 215 struct proc *p; 216 { 217 register int unit = UNIT(dev); 218 register struct mt_softc *sc = &mt_softc[unit]; 219 register int req_den; 220 int error; 221 222 dlog(LOG_DEBUG, "mt%d open: flags 0x%x\n", unit, sc->sc_flags); 223 if (unit >= NMT || (sc->sc_flags & MTF_EXISTS) == 0) 224 return (ENXIO); 225 if (sc->sc_flags & MTF_OPEN) 226 return (EBUSY); 227 sc->sc_flags |= MTF_OPEN; 228 sc->sc_ttyp = tprintf_open(p); 229 if ((sc->sc_flags & MTF_ALIVE) == 0) { 230 error = mtcommand(dev, MTRESET, 0); 231 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 232 goto errout; 233 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 234 (void) mtcommand(dev, MTREW, 0); 235 } 236 for (;;) { 237 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 238 goto errout; 239 if (!(sc->sc_flags & MTF_REW)) 240 break; 241 if (tsleep((caddr_t) &lbolt, PCATCH | (PZERO + 1), "mt", 0) != 0) { 242 error = EINTR; 243 goto errout; 244 } 245 } 246 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 247 error = EROFS; 248 goto errout; 249 } 250 if (!(sc->sc_stat1 & SR1_ONLINE)) { 251 uprintf("mt%d: not online\n", unit); 252 error = EIO; 253 goto errout; 254 } 255 /* 256 * Select density: 257 * - find out what density the drive is set to 258 * (i.e. the density of the current tape) 259 * - if we are going to write 260 * - if we're not at the beginning of the tape 261 * - complain if we want to change densities 262 * - otherwise, select the mtcommand to set the density 263 * 264 * If the drive doesn't support it then don't change the recorded 265 * density. 266 * 267 * The original MOREbsd code had these additional conditions 268 * for the mid-tape change 269 * 270 * req_den != T_BADBPI && 271 * sc->sc_density != T_6250BPI 272 * 273 * which suggests that it would be possible to write multiple 274 * densities if req_den == T_BAD_BPI or the current tape 275 * density was 6250. Testing of our 7980 suggests that the 276 * device cannot change densities mid-tape. 277 * 278 * ajv (at) comp.vuw.ac.nz 279 */ 280 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 281 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 282 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 283 req_den = (dev & T_DENSEL); 284 285 if (flag & FWRITE) { 286 if (!(sc->sc_stat1 & SR1_BOT)) { 287 if (sc->sc_density != req_den) { 288 uprintf("mt%d: can't change density mid-tape\n", unit); 289 error = EIO; 290 goto errout; 291 } 292 } 293 else { 294 int mtset_density = 295 (req_den == T_800BPI ? MTSET800BPI : ( 296 req_den == T_1600BPI ? MTSET1600BPI : ( 297 req_den == T_6250BPI ? MTSET6250BPI : ( 298 sc->sc_type == MT7980ID 299 ? MTSET6250DC 300 : MTSET6250BPI)))); 301 if (mtcommand(dev, mtset_density, 0) == 0) 302 sc->sc_density = req_den; 303 } 304 } 305 return (0); 306 errout: 307 sc->sc_flags &= ~MTF_OPEN; 308 return (error); 309 } 310 311 mtclose(dev, flag) 312 dev_t dev; 313 int flag; 314 { 315 register struct mt_softc *sc = &mt_softc[UNIT(dev)]; 316 317 if (sc->sc_flags & MTF_WRT) { 318 (void) mtcommand(dev, MTWEOF, 2); 319 (void) mtcommand(dev, MTBSF, 0); 320 } 321 if ((minor(dev) & T_NOREWIND) == 0) 322 (void) mtcommand(dev, MTREW, 0); 323 sc->sc_flags &= ~MTF_OPEN; 324 tprintf_close(sc->sc_ttyp); 325 return (0); 326 } 327 328 mtcommand(dev, cmd, cnt) 329 dev_t dev; 330 int cmd; 331 int cnt; 332 { 333 register struct buf *bp = &mtbuf[UNIT(dev)]; 334 int error = 0; 335 336 #if 1 337 if (bp->b_flags & B_BUSY) 338 return (EBUSY); 339 #endif 340 bp->b_cmd = cmd; 341 bp->b_dev = dev; 342 do { 343 bp->b_flags = B_BUSY | B_CMD; 344 mtstrategy(bp); 345 iowait(bp); 346 if (bp->b_flags & B_ERROR) { 347 error = (int) (unsigned) bp->b_error; 348 break; 349 } 350 } while (--cnt > 0); 351 #if 0 352 bp->b_flags = 0 /*&= ~B_BUSY*/; 353 #else 354 bp->b_flags &= ~B_BUSY; 355 #endif 356 return (error); 357 } 358 359 /* 360 * Only thing to check here is for legal record lengths (writes only). 361 */ 362 void 363 mtstrategy(bp) 364 register struct buf *bp; 365 { 366 register struct mt_softc *sc; 367 register struct buf *dp; 368 register int unit; 369 register int s; 370 371 unit = UNIT(bp->b_dev); 372 sc = &mt_softc[unit]; 373 dlog(LOG_DEBUG, "mt%d strategy\n", unit); 374 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 375 #define WRITE_BITS_IGNORED 8 376 #if 0 377 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 378 tprintf(sc->sc_ttyp, 379 "mt%d: write record must be multiple of %d\n", 380 unit, 1 << WRITE_BITS_IGNORED); 381 goto error; 382 } 383 #endif 384 s = 16 * 1024; 385 if (sc->sc_stat2 & SR2_LONGREC) { 386 switch (sc->sc_density) { 387 case T_1600BPI: 388 s = 32 * 1024; 389 break; 390 391 case T_6250BPI: 392 case T_BADBPI: 393 s = 60 * 1024; 394 break; 395 } 396 } 397 if (bp->b_bcount > s) { 398 tprintf(sc->sc_ttyp, 399 "mt%d: write record (%d) too big: limit (%d)\n", 400 unit, bp->b_bcount, s); 401 error: 402 bp->b_flags |= B_ERROR; 403 bp->b_error = EIO; 404 iodone(bp); 405 return; 406 } 407 } 408 dp = &mttab[unit]; 409 bp->b_actf = NULL; 410 s = splbio(); 411 bp->b_actb = dp->b_actb; 412 *dp->b_actb = bp; 413 dp->b_actb = &bp->b_actf; 414 if (dp->b_active == 0) { 415 dp->b_active = 1; 416 mtustart(unit); 417 } 418 splx(s); 419 } 420 421 void 422 mtustart(unit) 423 register int unit; 424 { 425 426 dlog(LOG_DEBUG, "mt%d ustart\n", unit); 427 if (hpibreq(&(mt_softc[unit].sc_dq))) 428 mtstart(unit); 429 } 430 431 #define hpibppclear(unit) \ 432 { hpib_softc[unit].sc_flags &= ~HPIBF_PPOLL; } 433 434 void 435 spl_mtintr(unit) 436 int unit; 437 { 438 int s = splbio(); 439 440 hpibppclear(mt_softc[unit].sc_hpibno); 441 mtintr(unit); 442 (void) splx(s); 443 } 444 445 void 446 spl_mtstart(unit) 447 int unit; 448 { 449 int s = splbio(); 450 451 mtstart(unit); 452 (void) splx(s); 453 } 454 455 void 456 mtstart(unit) 457 register int unit; 458 { 459 register struct mt_softc *sc = &mt_softc[unit]; 460 register struct buf *bp, *dp; 461 short cmdcount = 1; 462 u_char cmdbuf[2]; 463 464 dlog(LOG_DEBUG, "mt%d start\n", unit); 465 sc->sc_flags &= ~MTF_WRT; 466 bp = mttab[unit].b_actf; 467 if ((sc->sc_flags & MTF_ALIVE) == 0 && 468 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 469 goto fatalerror; 470 471 if (sc->sc_flags & MTF_REW) { 472 if (!hpibpptest(sc->sc_hpibno, sc->sc_slave)) 473 goto stillrew; 474 switch (mtreaddsj(unit, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 475 case 0: 476 case 1: 477 stillrew: 478 if ((sc->sc_stat1 & SR1_BOT) || 479 !(sc->sc_stat1 & SR1_ONLINE)) { 480 sc->sc_flags &= ~MTF_REW; 481 break; 482 } 483 case -2: 484 /* 485 * -2 means "timeout" reading DSJ, which is probably 486 * temporary. This is considered OK when doing a NOP, 487 * but not otherwise. 488 */ 489 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 490 timeout(spl_mtstart, (void *)unit, hz >> 5); 491 return; 492 } 493 case 2: 494 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 495 bp->b_error = EBUSY; 496 goto errdone; 497 } 498 goto done; 499 500 default: 501 goto fatalerror; 502 } 503 } 504 if (bp->b_flags & B_CMD) { 505 if (sc->sc_flags & MTF_PASTEOT) { 506 switch(bp->b_cmd) { 507 case MTFSF: 508 case MTWEOF: 509 case MTFSR: 510 bp->b_error = ENOSPC; 511 goto errdone; 512 513 case MTBSF: 514 case MTOFFL: 515 case MTBSR: 516 case MTREW: 517 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 518 break; 519 } 520 } 521 switch(bp->b_cmd) { 522 case MTFSF: 523 if (sc->sc_flags & MTF_HITEOF) 524 goto done; 525 cmdbuf[0] = MTTC_FSF; 526 break; 527 528 case MTBSF: 529 if (sc->sc_flags & MTF_HITBOF) 530 goto done; 531 cmdbuf[0] = MTTC_BSF; 532 break; 533 534 case MTOFFL: 535 sc->sc_flags |= MTF_REW; 536 cmdbuf[0] = MTTC_REWOFF; 537 break; 538 539 case MTWEOF: 540 cmdbuf[0] = MTTC_WFM; 541 break; 542 543 case MTBSR: 544 cmdbuf[0] = MTTC_BSR; 545 break; 546 547 case MTFSR: 548 cmdbuf[0] = MTTC_FSR; 549 break; 550 551 case MTREW: 552 sc->sc_flags |= MTF_REW; 553 cmdbuf[0] = MTTC_REW; 554 break; 555 556 case MTNOP: 557 /* 558 * NOP is supposed to set status bits. 559 * Force readdsj to do it. 560 */ 561 switch (mtreaddsj(unit, 562 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 563 default: 564 goto done; 565 566 case -1: 567 /* 568 * If this fails, perform a device clear 569 * to fix any protocol problems and (most 570 * likely) get the status. 571 */ 572 bp->b_cmd = MTRESET; 573 break; 574 575 case -2: 576 timeout(spl_mtstart, (void *)unit, hz >> 5); 577 return; 578 } 579 580 case MTRESET: 581 /* 582 * 1) selected device clear (send with "-2" secondary) 583 * 2) set timeout, then wait for "service request" 584 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 585 */ 586 if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){ 587 log(LOG_ERR, "mt%d can't reset\n", unit); 588 goto fatalerror; 589 } 590 timeout(spl_mtintr, (void *)unit, 4 * hz); 591 hpibawait(sc->sc_hpibno, sc->sc_slave); 592 return; 593 594 case MTSET800BPI: 595 cmdbuf[0] = MTTC_800; 596 break; 597 598 case MTSET1600BPI: 599 cmdbuf[0] = MTTC_1600; 600 break; 601 602 case MTSET6250BPI: 603 cmdbuf[0] = MTTC_6250; 604 break; 605 606 case MTSET6250DC: 607 cmdbuf[0] = MTTC_DC6250; 608 break; 609 } 610 } else { 611 if (sc->sc_flags & MTF_PASTEOT) { 612 bp->b_error = ENOSPC; 613 goto errdone; 614 } 615 if (bp->b_flags & B_READ) { 616 sc->sc_flags |= MTF_IO; 617 cmdbuf[0] = MTTC_READ; 618 } else { 619 sc->sc_flags |= MTF_WRT | MTF_IO; 620 cmdbuf[0] = MTTC_WRITE; 621 cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 622 cmdcount = 2; 623 } 624 } 625 if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 626 == cmdcount) { 627 if (sc->sc_flags & MTF_REW) 628 goto done; 629 hpibawait(sc->sc_hpibno); 630 return; 631 } 632 fatalerror: 633 /* 634 * If anything fails, the drive is probably hosed, so mark it not 635 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 636 * if, last we heard, it was REWinding, remember that). 637 */ 638 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 639 bp->b_error = EIO; 640 errdone: 641 bp->b_flags |= B_ERROR; 642 done: 643 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 644 iodone(bp); 645 if (dp = bp->b_actf) 646 dp->b_actb = bp->b_actb; 647 else 648 mttab[unit].b_actb = bp->b_actb; 649 *bp->b_actb = dp; 650 hpibfree(&(sc->sc_dq)); 651 if ((bp = dp) == NULL) 652 mttab[unit].b_active = 0; 653 else 654 mtustart(unit); 655 } 656 657 /* 658 * The Utah code had a bug which meant that the driver was unable to read. 659 * "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized. 660 * -- ajv (at) comp.vuw.ac.nz 661 */ 662 void 663 mtgo(unit) 664 register int unit; 665 { 666 register struct mt_softc *sc = &mt_softc[unit]; 667 register struct buf *bp; 668 int rw; 669 670 dlog(LOG_DEBUG, "mt%d go\n", unit); 671 bp = mttab[unit].b_actf; 672 rw = bp->b_flags & B_READ; 673 hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE, 674 bp->b_un.b_addr, bp->b_bcount, rw, rw != 0); 675 } 676 677 mtintr(unit) 678 register int unit; 679 { 680 register struct mt_softc *sc = &mt_softc[unit]; 681 register struct buf *bp, *dp; 682 register int i; 683 u_char cmdbuf[4]; 684 685 bp = mttab[unit].b_actf; 686 if (bp == NULL) { 687 log(LOG_ERR, "mt%d intr: bp == NULL\n", unit); 688 return; 689 } 690 dlog(LOG_DEBUG, "mt%d intr\n", unit); 691 /* 692 * Some operation completed. Read status bytes and report errors. 693 * Clear EOF flags here `cause they're set once on specific conditions 694 * below when a command succeeds. 695 * A DSJ of 2 always means keep waiting. If the command was READ 696 * (and we're in data DMA phase) stop data transfer first. 697 */ 698 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 699 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 700 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 701 cmdbuf[0] = MTE_STOP; 702 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1); 703 } 704 switch (mtreaddsj(unit, 0)) { 705 case 0: 706 break; 707 708 case 1: 709 /* 710 * If we're in the middle of a READ/WRITE and have yet to 711 * start the data transfer, a DSJ of one should terminate it. 712 */ 713 sc->sc_flags &= ~MTF_IO; 714 break; 715 716 case 2: 717 (void) hpibawait(sc->sc_hpibno); 718 return; 719 720 case -2: 721 /* 722 * -2 means that the drive failed to respond quickly enough 723 * to the request for DSJ. It's probably just "busy" figuring 724 * it out and will know in a little bit... 725 */ 726 timeout(spl_mtintr, (void *)unit, hz >> 5); 727 return; 728 729 default: 730 log(LOG_ERR, "mt%d intr: can't get drive stat\n", unit); 731 goto error; 732 } 733 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 734 i = sc->sc_stat4 & SR4_ERCLMASK; 735 log(LOG_ERR, "mt%d: %s error, retry %d, SR2/3 %x/%x, code %d\n", 736 unit, i == SR4_DEVICE ? "device" : 737 (i == SR4_PROTOCOL ? "protocol" : 738 (i == SR4_SELFTEST ? "selftest" : "unknown")), 739 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 740 sc->sc_stat3, sc->sc_stat5); 741 742 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 743 untimeout(spl_mtintr, (void *)unit); 744 if (sc->sc_stat3 & SR3_POWERUP) 745 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 746 goto error; 747 } 748 /* 749 * Report and clear any soft errors. 750 */ 751 if (sc->sc_stat1 & SR1_SOFTERR) { 752 log(LOG_WARNING, "mt%d: soft error, retry %d\n", 753 unit, sc->sc_stat4 & SR4_RETRYMASK); 754 sc->sc_stat1 &= ~SR1_SOFTERR; 755 } 756 /* 757 * We've initiated a read or write, but haven't actually started to 758 * DMA the data yet. At this point, the drive's ready. 759 */ 760 if (sc->sc_flags & MTF_IO) { 761 sc->sc_flags &= ~MTF_IO; 762 if (hpibustart(sc->sc_hpibno)) 763 mtgo(unit); 764 return; 765 } 766 /* 767 * Check for End Of Tape - we're allowed to hit EOT and then write (or 768 * read) one more record. If we get here and have not already hit EOT, 769 * return ENOSPC to inform the process that it's hit it. If we get 770 * here and HAVE already hit EOT, don't allow any more operations that 771 * move the tape forward. 772 */ 773 if (sc->sc_stat1 & SR1_EOT) { 774 if (sc->sc_flags & MTF_ATEOT) 775 sc->sc_flags |= MTF_PASTEOT; 776 else { 777 bp->b_flags |= B_ERROR; 778 bp->b_error = ENOSPC; 779 sc->sc_flags |= MTF_ATEOT; 780 } 781 } 782 /* 783 * If a motion command was being executed, check for Tape Marks. 784 * If we were doing data, make sure we got the right amount, and 785 * check for hitting tape marks on reads. 786 */ 787 if (bp->b_flags & B_CMD) { 788 if (sc->sc_stat1 & SR1_EOF) { 789 if (bp->b_cmd == MTFSR) 790 sc->sc_flags |= MTF_HITEOF; 791 if (bp->b_cmd == MTBSR) 792 sc->sc_flags |= MTF_HITBOF; 793 } 794 if (bp->b_cmd == MTRESET) { 795 untimeout(spl_mtintr, (void *)unit); 796 sc->sc_flags |= MTF_ALIVE; 797 } 798 } else { 799 i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2); 800 if (i != 2) { 801 log(LOG_ERR, "mt%d intr: can't get xfer length\n"); 802 goto error; 803 } 804 i = (int) *((u_short *) cmdbuf); 805 if (i <= bp->b_bcount) { 806 if (i == 0) 807 sc->sc_flags |= MTF_HITEOF; 808 bp->b_resid = bp->b_bcount - i; 809 dlog(LOG_DEBUG, "mt%d intr: bcount %d, resid %d\n", 810 unit, bp->b_bcount, bp->b_resid); 811 } else { 812 tprintf(sc->sc_ttyp, 813 "mt%d: record (%d) larger than wanted (%d)\n", 814 unit, i, bp->b_bcount); 815 error: 816 sc->sc_flags &= ~MTF_IO; 817 bp->b_error = EIO; 818 bp->b_flags |= B_ERROR; 819 } 820 } 821 /* 822 * The operation is completely done. 823 * Let the drive know with an END command. 824 */ 825 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 826 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1); 827 bp->b_flags &= ~B_CMD; 828 iodone(bp); 829 if (dp = bp->b_actf) 830 dp->b_actb = bp->b_actb; 831 else 832 mttab[unit].b_actb = bp->b_actb; 833 *bp->b_actb = dp; 834 hpibfree(&(sc->sc_dq)); 835 #if 0 836 if (bp /*mttab[unit].b_actf*/ == NULL) 837 #else 838 if (mttab[unit].b_actf == NULL) 839 #endif 840 mttab[unit].b_active = 0; 841 else 842 mtustart(unit); 843 } 844 845 mtread(dev, uio) 846 dev_t dev; 847 struct uio *uio; 848 { 849 return(physio(mtstrategy, &mtbuf[UNIT(dev)], dev, B_READ, minphys, uio)); 850 } 851 852 mtwrite(dev, uio) 853 dev_t dev; 854 struct uio *uio; 855 { 856 return(physio(mtstrategy, &mtbuf[UNIT(dev)], dev, B_WRITE, minphys, uio)); 857 } 858 859 mtioctl(dev, cmd, data, flag) 860 dev_t dev; 861 u_long cmd; 862 caddr_t data; 863 int flag; 864 { 865 register struct mtop *op; 866 int cnt; 867 868 switch (cmd) { 869 case MTIOCTOP: 870 op = (struct mtop *)data; 871 switch(op->mt_op) { 872 case MTWEOF: 873 case MTFSF: 874 case MTBSR: 875 case MTBSF: 876 case MTFSR: 877 cnt = op->mt_count; 878 break; 879 880 case MTOFFL: 881 case MTREW: 882 case MTNOP: 883 cnt = 0; 884 break; 885 886 default: 887 return (EINVAL); 888 } 889 return (mtcommand(dev, op->mt_op, cnt)); 890 891 case MTIOCGET: 892 break; 893 894 default: 895 return (EINVAL); 896 } 897 return (0); 898 } 899 900 /*ARGSUSED*/ 901 mtdump(dev) 902 dev_t dev; 903 { 904 return(ENXIO); 905 } 906 907 #endif /* NMT > 0 */ 908
Indexes created Tue Sep 23 21:09:50 GMT 2025