mt.c revision 1.2
1 /* $NetBSD: mt.c,v 1.2 1995/12/02 18:22:04 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 struct hp_device *sc_hd; 66 short sc_hpibno; /* logical HPIB this slave it attached to */ 67 short 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 devqueue sc_dq; /* HPIB device queue member */ 77 tpr_t sc_ttyp; 78 } mt_softc[NMT]; 79 struct buf mttab[NMT]; 80 struct buf mtbuf[NMT]; 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(), mtintr(); 95 void mtattach(), mtustart(), mtstart(), mtgo(), mtstrategy(); 96 struct driver mtdriver = { 97 mtmatch, mtattach, "mt", (int (*)()) mtstart, (int (*)()) mtgo, mtintr, 98 }; 99 100 int 101 mtmatch(hd) 102 register struct hp_device *hd; 103 { 104 register int unit; 105 register int hpibno = hd->hp_ctlr; 106 register int slave = hd->hp_slave; 107 register struct mt_softc *sc = &mt_softc[hd->hp_unit]; 108 register int id; 109 register struct buf *bp; 110 111 sc->sc_hd = hd; 112 113 for (bp = mttab; bp < &mttab[NMT]; bp++) 114 bp->b_actb = &bp->b_actf; 115 unit = hpibid(hpibno, slave); 116 for (id = 0; id < nmtinfo; id++) 117 if (unit == mtinfo[id].hwid) 118 return (1); 119 return (0); /* not a known HP magtape */ 120 } 121 122 void 123 mtattach(hd) 124 register struct hp_device *hd; 125 { 126 register int unit; 127 register int hpibno = hd->hp_ctlr; 128 register int slave = hd->hp_slave; 129 register struct mt_softc *sc; 130 register int id; 131 register struct buf *bp; 132 133 /* XXX Ick. */ 134 unit = hpibid(hpibno, slave); 135 for (id = 0; id < nmtinfo; id++) 136 if (unit == mtinfo[id].hwid) 137 break; 138 139 unit = hd->hp_unit; 140 sc = &mt_softc[unit]; 141 sc->sc_type = mtinfo[id].hwid; 142 printf(": %s tape\n", mtinfo[id].desc); 143 144 sc->sc_hpibno = hpibno; 145 sc->sc_slave = slave; 146 sc->sc_flags = MTF_EXISTS; 147 sc->sc_dq.dq_ctlr = hpibno; 148 sc->sc_dq.dq_unit = unit; 149 sc->sc_dq.dq_slave = slave; 150 sc->sc_dq.dq_driver = &mtdriver; 151 } 152 153 /* 154 * Perform a read of "Device Status Jump" register and update the 155 * status if necessary. If status is read, the given "ecmd" is also 156 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 157 * and -2 on "temporary" failure. 158 */ 159 mtreaddsj(unit, ecmd) 160 register int unit; 161 int ecmd; 162 { 163 register struct mt_softc *sc = &mt_softc[unit]; 164 int retval; 165 166 if (sc->sc_flags & MTF_STATTIMEO) 167 goto getstats; 168 retval = hpibrecv(sc->sc_hpibno, 169 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 170 MTT_DSJ, &(sc->sc_lastdsj), 1); 171 sc->sc_flags &= ~MTF_DSJTIMEO; 172 if (retval != 1) { 173 dlog(LOG_DEBUG, "mt%d can't hpibrecv DSJ\n", unit); 174 if (sc->sc_recvtimeo == 0) 175 sc->sc_recvtimeo = hz; 176 if (--sc->sc_recvtimeo == 0) 177 return (-1); 178 if (retval == 0) 179 sc->sc_flags |= MTF_DSJTIMEO; 180 return (-2); 181 } 182 sc->sc_recvtimeo = 0; 183 sc->sc_statindex = 0; 184 dlog(LOG_DEBUG, "mt%d readdsj: 0x%x\n", unit, sc->sc_lastdsj); 185 sc->sc_lastecmd = ecmd; 186 switch (sc->sc_lastdsj) { 187 case 0: 188 if (ecmd & MTE_DSJ_FORCE) 189 break; 190 return (0); 191 192 case 2: 193 sc->sc_lastecmd = MTE_COMPLETE; 194 case 1: 195 break; 196 197 default: 198 log(LOG_ERR, "mt%d readdsj: DSJ 0x%x\n", unit, sc->sc_lastdsj); 199 return (-1); 200 } 201 getstats: 202 retval = hpibrecv(sc->sc_hpibno, 203 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, 204 MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex, 205 sizeof(sc->sc_stat) - sc->sc_statindex); 206 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 207 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 208 if (sc->sc_recvtimeo == 0) 209 sc->sc_recvtimeo = hz; 210 if (--sc->sc_recvtimeo != 0) { 211 if (retval >= 0) { 212 sc->sc_statindex += retval; 213 sc->sc_flags |= MTF_STATCONT; 214 } 215 sc->sc_flags |= MTF_STATTIMEO; 216 return (-2); 217 } 218 log(LOG_ERR, "mt%d readdsj: can't read status\n", unit); 219 return (-1); 220 } 221 sc->sc_recvtimeo = 0; 222 sc->sc_statindex = 0; 223 dlog(LOG_DEBUG, "mt%d readdsj: status is %x %x %x %x %x %x\n", unit, 224 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 225 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6); 226 if (sc->sc_lastecmd) 227 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, 228 MTL_ECMD, &(sc->sc_lastecmd), 1); 229 return ((int) sc->sc_lastdsj); 230 } 231 232 mtopen(dev, flag, mode, p) 233 dev_t dev; 234 int flag, mode; 235 struct proc *p; 236 { 237 register int unit = UNIT(dev); 238 register struct mt_softc *sc = &mt_softc[unit]; 239 register int req_den; 240 int error; 241 242 dlog(LOG_DEBUG, "mt%d open: flags 0x%x\n", unit, sc->sc_flags); 243 if (unit >= NMT || (sc->sc_flags & MTF_EXISTS) == 0) 244 return (ENXIO); 245 if (sc->sc_flags & MTF_OPEN) 246 return (EBUSY); 247 sc->sc_flags |= MTF_OPEN; 248 sc->sc_ttyp = tprintf_open(p); 249 if ((sc->sc_flags & MTF_ALIVE) == 0) { 250 error = mtcommand(dev, MTRESET, 0); 251 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 252 goto errout; 253 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 254 (void) mtcommand(dev, MTREW, 0); 255 } 256 for (;;) { 257 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 258 goto errout; 259 if (!(sc->sc_flags & MTF_REW)) 260 break; 261 if (tsleep((caddr_t) &lbolt, PCATCH | (PZERO + 1), "mt", 0) != 0) { 262 error = EINTR; 263 goto errout; 264 } 265 } 266 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 267 error = EROFS; 268 goto errout; 269 } 270 if (!(sc->sc_stat1 & SR1_ONLINE)) { 271 uprintf("%s: not online\n", sc->sc_hd->hp_xname); 272 error = EIO; 273 goto errout; 274 } 275 /* 276 * Select density: 277 * - find out what density the drive is set to 278 * (i.e. the density of the current tape) 279 * - if we are going to write 280 * - if we're not at the beginning of the tape 281 * - complain if we want to change densities 282 * - otherwise, select the mtcommand to set the density 283 * 284 * If the drive doesn't support it then don't change the recorded 285 * density. 286 * 287 * The original MOREbsd code had these additional conditions 288 * for the mid-tape change 289 * 290 * req_den != T_BADBPI && 291 * sc->sc_density != T_6250BPI 292 * 293 * which suggests that it would be possible to write multiple 294 * densities if req_den == T_BAD_BPI or the current tape 295 * density was 6250. Testing of our 7980 suggests that the 296 * device cannot change densities mid-tape. 297 * 298 * ajv (at) comp.vuw.ac.nz 299 */ 300 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 301 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 302 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 303 req_den = (dev & T_DENSEL); 304 305 if (flag & FWRITE) { 306 if (!(sc->sc_stat1 & SR1_BOT)) { 307 if (sc->sc_density != req_den) { 308 uprintf("%s: can't change density mid-tape\n", 309 sc->sc_hd->hp_xname); 310 error = EIO; 311 goto errout; 312 } 313 } 314 else { 315 int mtset_density = 316 (req_den == T_800BPI ? MTSET800BPI : ( 317 req_den == T_1600BPI ? MTSET1600BPI : ( 318 req_den == T_6250BPI ? MTSET6250BPI : ( 319 sc->sc_type == MT7980ID 320 ? MTSET6250DC 321 : MTSET6250BPI)))); 322 if (mtcommand(dev, mtset_density, 0) == 0) 323 sc->sc_density = req_den; 324 } 325 } 326 return (0); 327 errout: 328 sc->sc_flags &= ~MTF_OPEN; 329 return (error); 330 } 331 332 mtclose(dev, flag) 333 dev_t dev; 334 int flag; 335 { 336 register struct mt_softc *sc = &mt_softc[UNIT(dev)]; 337 338 if (sc->sc_flags & MTF_WRT) { 339 (void) mtcommand(dev, MTWEOF, 2); 340 (void) mtcommand(dev, MTBSF, 0); 341 } 342 if ((minor(dev) & T_NOREWIND) == 0) 343 (void) mtcommand(dev, MTREW, 0); 344 sc->sc_flags &= ~MTF_OPEN; 345 tprintf_close(sc->sc_ttyp); 346 return (0); 347 } 348 349 mtcommand(dev, cmd, cnt) 350 dev_t dev; 351 int cmd; 352 int cnt; 353 { 354 register struct buf *bp = &mtbuf[UNIT(dev)]; 355 int error = 0; 356 357 #if 1 358 if (bp->b_flags & B_BUSY) 359 return (EBUSY); 360 #endif 361 bp->b_cmd = cmd; 362 bp->b_dev = dev; 363 do { 364 bp->b_flags = B_BUSY | B_CMD; 365 mtstrategy(bp); 366 iowait(bp); 367 if (bp->b_flags & B_ERROR) { 368 error = (int) (unsigned) bp->b_error; 369 break; 370 } 371 } while (--cnt > 0); 372 #if 0 373 bp->b_flags = 0 /*&= ~B_BUSY*/; 374 #else 375 bp->b_flags &= ~B_BUSY; 376 #endif 377 return (error); 378 } 379 380 /* 381 * Only thing to check here is for legal record lengths (writes only). 382 */ 383 void 384 mtstrategy(bp) 385 register struct buf *bp; 386 { 387 register struct mt_softc *sc; 388 register struct buf *dp; 389 register int unit; 390 register int s; 391 392 unit = UNIT(bp->b_dev); 393 sc = &mt_softc[unit]; 394 dlog(LOG_DEBUG, "mt%d strategy\n", unit); 395 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 396 #define WRITE_BITS_IGNORED 8 397 #if 0 398 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 399 tprintf(sc->sc_ttyp, 400 "%s: write record must be multiple of %d\n", 401 sc->sc_hd->hp_xname, 1 << WRITE_BITS_IGNORED); 402 goto error; 403 } 404 #endif 405 s = 16 * 1024; 406 if (sc->sc_stat2 & SR2_LONGREC) { 407 switch (sc->sc_density) { 408 case T_1600BPI: 409 s = 32 * 1024; 410 break; 411 412 case T_6250BPI: 413 case T_BADBPI: 414 s = 60 * 1024; 415 break; 416 } 417 } 418 if (bp->b_bcount > s) { 419 tprintf(sc->sc_ttyp, 420 "%s: write record (%d) too big: limit (%d)\n", 421 sc->sc_hd->hp_xname, bp->b_bcount, s); 422 error: 423 bp->b_flags |= B_ERROR; 424 bp->b_error = EIO; 425 iodone(bp); 426 return; 427 } 428 } 429 dp = &mttab[unit]; 430 bp->b_actf = NULL; 431 s = splbio(); 432 bp->b_actb = dp->b_actb; 433 *dp->b_actb = bp; 434 dp->b_actb = &bp->b_actf; 435 if (dp->b_active == 0) { 436 dp->b_active = 1; 437 mtustart(unit); 438 } 439 splx(s); 440 } 441 442 void 443 mtustart(unit) 444 register int unit; 445 { 446 447 dlog(LOG_DEBUG, "mt%d ustart\n", unit); 448 if (hpibreq(&(mt_softc[unit].sc_dq))) 449 mtstart(unit); 450 } 451 452 #define hpibppclear(unit) \ 453 { hpib_softc[unit].sc_flags &= ~HPIBF_PPOLL; } 454 455 void 456 spl_mtintr(unit) 457 int unit; 458 { 459 int s = splbio(); 460 461 hpibppclear(mt_softc[unit].sc_hpibno); 462 mtintr(unit); 463 (void) splx(s); 464 } 465 466 void 467 spl_mtstart(unit) 468 int unit; 469 { 470 int s = splbio(); 471 472 mtstart(unit); 473 (void) splx(s); 474 } 475 476 void 477 mtstart(unit) 478 register int unit; 479 { 480 register struct mt_softc *sc = &mt_softc[unit]; 481 register struct buf *bp, *dp; 482 short cmdcount = 1; 483 u_char cmdbuf[2]; 484 485 dlog(LOG_DEBUG, "mt%d start\n", unit); 486 sc->sc_flags &= ~MTF_WRT; 487 bp = mttab[unit].b_actf; 488 if ((sc->sc_flags & MTF_ALIVE) == 0 && 489 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 490 goto fatalerror; 491 492 if (sc->sc_flags & MTF_REW) { 493 if (!hpibpptest(sc->sc_hpibno, sc->sc_slave)) 494 goto stillrew; 495 switch (mtreaddsj(unit, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 496 case 0: 497 case 1: 498 stillrew: 499 if ((sc->sc_stat1 & SR1_BOT) || 500 !(sc->sc_stat1 & SR1_ONLINE)) { 501 sc->sc_flags &= ~MTF_REW; 502 break; 503 } 504 case -2: 505 /* 506 * -2 means "timeout" reading DSJ, which is probably 507 * temporary. This is considered OK when doing a NOP, 508 * but not otherwise. 509 */ 510 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 511 timeout(spl_mtstart, (void *)unit, hz >> 5); 512 return; 513 } 514 case 2: 515 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 516 bp->b_error = EBUSY; 517 goto errdone; 518 } 519 goto done; 520 521 default: 522 goto fatalerror; 523 } 524 } 525 if (bp->b_flags & B_CMD) { 526 if (sc->sc_flags & MTF_PASTEOT) { 527 switch(bp->b_cmd) { 528 case MTFSF: 529 case MTWEOF: 530 case MTFSR: 531 bp->b_error = ENOSPC; 532 goto errdone; 533 534 case MTBSF: 535 case MTOFFL: 536 case MTBSR: 537 case MTREW: 538 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 539 break; 540 } 541 } 542 switch(bp->b_cmd) { 543 case MTFSF: 544 if (sc->sc_flags & MTF_HITEOF) 545 goto done; 546 cmdbuf[0] = MTTC_FSF; 547 break; 548 549 case MTBSF: 550 if (sc->sc_flags & MTF_HITBOF) 551 goto done; 552 cmdbuf[0] = MTTC_BSF; 553 break; 554 555 case MTOFFL: 556 sc->sc_flags |= MTF_REW; 557 cmdbuf[0] = MTTC_REWOFF; 558 break; 559 560 case MTWEOF: 561 cmdbuf[0] = MTTC_WFM; 562 break; 563 564 case MTBSR: 565 cmdbuf[0] = MTTC_BSR; 566 break; 567 568 case MTFSR: 569 cmdbuf[0] = MTTC_FSR; 570 break; 571 572 case MTREW: 573 sc->sc_flags |= MTF_REW; 574 cmdbuf[0] = MTTC_REW; 575 break; 576 577 case MTNOP: 578 /* 579 * NOP is supposed to set status bits. 580 * Force readdsj to do it. 581 */ 582 switch (mtreaddsj(unit, 583 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 584 default: 585 goto done; 586 587 case -1: 588 /* 589 * If this fails, perform a device clear 590 * to fix any protocol problems and (most 591 * likely) get the status. 592 */ 593 bp->b_cmd = MTRESET; 594 break; 595 596 case -2: 597 timeout(spl_mtstart, (void *)unit, hz >> 5); 598 return; 599 } 600 601 case MTRESET: 602 /* 603 * 1) selected device clear (send with "-2" secondary) 604 * 2) set timeout, then wait for "service request" 605 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 606 */ 607 if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){ 608 log(LOG_ERR, "mt%d can't reset\n", unit); 609 goto fatalerror; 610 } 611 timeout(spl_mtintr, (void *)unit, 4 * hz); 612 hpibawait(sc->sc_hpibno, sc->sc_slave); 613 return; 614 615 case MTSET800BPI: 616 cmdbuf[0] = MTTC_800; 617 break; 618 619 case MTSET1600BPI: 620 cmdbuf[0] = MTTC_1600; 621 break; 622 623 case MTSET6250BPI: 624 cmdbuf[0] = MTTC_6250; 625 break; 626 627 case MTSET6250DC: 628 cmdbuf[0] = MTTC_DC6250; 629 break; 630 } 631 } else { 632 if (sc->sc_flags & MTF_PASTEOT) { 633 bp->b_error = ENOSPC; 634 goto errdone; 635 } 636 if (bp->b_flags & B_READ) { 637 sc->sc_flags |= MTF_IO; 638 cmdbuf[0] = MTTC_READ; 639 } else { 640 sc->sc_flags |= MTF_WRT | MTF_IO; 641 cmdbuf[0] = MTTC_WRITE; 642 cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 643 cmdcount = 2; 644 } 645 } 646 if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 647 == cmdcount) { 648 if (sc->sc_flags & MTF_REW) 649 goto done; 650 hpibawait(sc->sc_hpibno); 651 return; 652 } 653 fatalerror: 654 /* 655 * If anything fails, the drive is probably hosed, so mark it not 656 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 657 * if, last we heard, it was REWinding, remember that). 658 */ 659 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 660 bp->b_error = EIO; 661 errdone: 662 bp->b_flags |= B_ERROR; 663 done: 664 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 665 iodone(bp); 666 if (dp = bp->b_actf) 667 dp->b_actb = bp->b_actb; 668 else 669 mttab[unit].b_actb = bp->b_actb; 670 *bp->b_actb = dp; 671 hpibfree(&(sc->sc_dq)); 672 if ((bp = dp) == NULL) 673 mttab[unit].b_active = 0; 674 else 675 mtustart(unit); 676 } 677 678 /* 679 * The Utah code had a bug which meant that the driver was unable to read. 680 * "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized. 681 * -- ajv (at) comp.vuw.ac.nz 682 */ 683 void 684 mtgo(unit) 685 register int unit; 686 { 687 register struct mt_softc *sc = &mt_softc[unit]; 688 register struct buf *bp; 689 int rw; 690 691 dlog(LOG_DEBUG, "mt%d go\n", unit); 692 bp = mttab[unit].b_actf; 693 rw = bp->b_flags & B_READ; 694 hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE, 695 bp->b_un.b_addr, bp->b_bcount, rw, rw != 0); 696 } 697 698 mtintr(unit) 699 register int unit; 700 { 701 register struct mt_softc *sc = &mt_softc[unit]; 702 register struct buf *bp, *dp; 703 register int i; 704 u_char cmdbuf[4]; 705 706 bp = mttab[unit].b_actf; 707 if (bp == NULL) { 708 log(LOG_ERR, "mt%d intr: bp == NULL\n", unit); 709 return; 710 } 711 dlog(LOG_DEBUG, "mt%d intr\n", unit); 712 /* 713 * Some operation completed. Read status bytes and report errors. 714 * Clear EOF flags here `cause they're set once on specific conditions 715 * below when a command succeeds. 716 * A DSJ of 2 always means keep waiting. If the command was READ 717 * (and we're in data DMA phase) stop data transfer first. 718 */ 719 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 720 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 721 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 722 cmdbuf[0] = MTE_STOP; 723 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1); 724 } 725 switch (mtreaddsj(unit, 0)) { 726 case 0: 727 break; 728 729 case 1: 730 /* 731 * If we're in the middle of a READ/WRITE and have yet to 732 * start the data transfer, a DSJ of one should terminate it. 733 */ 734 sc->sc_flags &= ~MTF_IO; 735 break; 736 737 case 2: 738 (void) hpibawait(sc->sc_hpibno); 739 return; 740 741 case -2: 742 /* 743 * -2 means that the drive failed to respond quickly enough 744 * to the request for DSJ. It's probably just "busy" figuring 745 * it out and will know in a little bit... 746 */ 747 timeout(spl_mtintr, (void *)unit, hz >> 5); 748 return; 749 750 default: 751 log(LOG_ERR, "mt%d intr: can't get drive stat\n", unit); 752 goto error; 753 } 754 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 755 i = sc->sc_stat4 & SR4_ERCLMASK; 756 log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d\n", 757 sc->sc_hd->hp_xname, i == SR4_DEVICE ? "device" : 758 (i == SR4_PROTOCOL ? "protocol" : 759 (i == SR4_SELFTEST ? "selftest" : "unknown")), 760 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 761 sc->sc_stat3, sc->sc_stat5); 762 763 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 764 untimeout(spl_mtintr, (void *)unit); 765 if (sc->sc_stat3 & SR3_POWERUP) 766 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 767 goto error; 768 } 769 /* 770 * Report and clear any soft errors. 771 */ 772 if (sc->sc_stat1 & SR1_SOFTERR) { 773 log(LOG_WARNING, "%s: soft error, retry %d\n", 774 sc->sc_hd->hp_xname, sc->sc_stat4 & SR4_RETRYMASK); 775 sc->sc_stat1 &= ~SR1_SOFTERR; 776 } 777 /* 778 * We've initiated a read or write, but haven't actually started to 779 * DMA the data yet. At this point, the drive's ready. 780 */ 781 if (sc->sc_flags & MTF_IO) { 782 sc->sc_flags &= ~MTF_IO; 783 if (hpibustart(sc->sc_hpibno)) 784 mtgo(unit); 785 return; 786 } 787 /* 788 * Check for End Of Tape - we're allowed to hit EOT and then write (or 789 * read) one more record. If we get here and have not already hit EOT, 790 * return ENOSPC to inform the process that it's hit it. If we get 791 * here and HAVE already hit EOT, don't allow any more operations that 792 * move the tape forward. 793 */ 794 if (sc->sc_stat1 & SR1_EOT) { 795 if (sc->sc_flags & MTF_ATEOT) 796 sc->sc_flags |= MTF_PASTEOT; 797 else { 798 bp->b_flags |= B_ERROR; 799 bp->b_error = ENOSPC; 800 sc->sc_flags |= MTF_ATEOT; 801 } 802 } 803 /* 804 * If a motion command was being executed, check for Tape Marks. 805 * If we were doing data, make sure we got the right amount, and 806 * check for hitting tape marks on reads. 807 */ 808 if (bp->b_flags & B_CMD) { 809 if (sc->sc_stat1 & SR1_EOF) { 810 if (bp->b_cmd == MTFSR) 811 sc->sc_flags |= MTF_HITEOF; 812 if (bp->b_cmd == MTBSR) 813 sc->sc_flags |= MTF_HITBOF; 814 } 815 if (bp->b_cmd == MTRESET) { 816 untimeout(spl_mtintr, (void *)unit); 817 sc->sc_flags |= MTF_ALIVE; 818 } 819 } else { 820 i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2); 821 if (i != 2) { 822 log(LOG_ERR, "mt%d intr: can't get xfer length\n"); 823 goto error; 824 } 825 i = (int) *((u_short *) cmdbuf); 826 if (i <= bp->b_bcount) { 827 if (i == 0) 828 sc->sc_flags |= MTF_HITEOF; 829 bp->b_resid = bp->b_bcount - i; 830 dlog(LOG_DEBUG, "mt%d intr: bcount %d, resid %d\n", 831 unit, bp->b_bcount, bp->b_resid); 832 } else { 833 tprintf(sc->sc_ttyp, 834 "%s: record (%d) larger than wanted (%d)\n", 835 sc->sc_hd->hp_xname, i, bp->b_bcount); 836 error: 837 sc->sc_flags &= ~MTF_IO; 838 bp->b_error = EIO; 839 bp->b_flags |= B_ERROR; 840 } 841 } 842 /* 843 * The operation is completely done. 844 * Let the drive know with an END command. 845 */ 846 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 847 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1); 848 bp->b_flags &= ~B_CMD; 849 iodone(bp); 850 if (dp = bp->b_actf) 851 dp->b_actb = bp->b_actb; 852 else 853 mttab[unit].b_actb = bp->b_actb; 854 *bp->b_actb = dp; 855 hpibfree(&(sc->sc_dq)); 856 #if 0 857 if (bp /*mttab[unit].b_actf*/ == NULL) 858 #else 859 if (mttab[unit].b_actf == NULL) 860 #endif 861 mttab[unit].b_active = 0; 862 else 863 mtustart(unit); 864 } 865 866 mtread(dev, uio) 867 dev_t dev; 868 struct uio *uio; 869 { 870 return(physio(mtstrategy, &mtbuf[UNIT(dev)], dev, B_READ, minphys, uio)); 871 } 872 873 mtwrite(dev, uio) 874 dev_t dev; 875 struct uio *uio; 876 { 877 return(physio(mtstrategy, &mtbuf[UNIT(dev)], dev, B_WRITE, minphys, uio)); 878 } 879 880 mtioctl(dev, cmd, data, flag) 881 dev_t dev; 882 u_long cmd; 883 caddr_t data; 884 int flag; 885 { 886 register struct mtop *op; 887 int cnt; 888 889 switch (cmd) { 890 case MTIOCTOP: 891 op = (struct mtop *)data; 892 switch(op->mt_op) { 893 case MTWEOF: 894 case MTFSF: 895 case MTBSR: 896 case MTBSF: 897 case MTFSR: 898 cnt = op->mt_count; 899 break; 900 901 case MTOFFL: 902 case MTREW: 903 case MTNOP: 904 cnt = 0; 905 break; 906 907 default: 908 return (EINVAL); 909 } 910 return (mtcommand(dev, op->mt_op, cnt)); 911 912 case MTIOCGET: 913 break; 914 915 default: 916 return (EINVAL); 917 } 918 return (0); 919 } 920 921 /*ARGSUSED*/ 922 mtdump(dev) 923 dev_t dev; 924 { 925 return(ENXIO); 926 } 927 928 #endif /* NMT > 0 */ 929
Indexes created Tue Sep 23 07:09:52 GMT 2025