mt.c revision 1.6
1 /* $NetBSD: mt.c,v 1.6 1996/10/14 07:14:18 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_softc = sc; 148 sc->sc_dq.dq_ctlr = hpibno; 149 sc->sc_dq.dq_unit = unit; 150 sc->sc_dq.dq_slave = slave; 151 sc->sc_dq.dq_driver = &mtdriver; 152 153 /* XXX Set device class. */ 154 hd->hp_dev.dv_class = DV_TAPE; 155 } 156 157 /* 158 * Perform a read of "Device Status Jump" register and update the 159 * status if necessary. If status is read, the given "ecmd" is also 160 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 161 * and -2 on "temporary" failure. 162 */ 163 mtreaddsj(unit, ecmd) 164 register int unit; 165 int ecmd; 166 { 167 register struct mt_softc *sc = &mt_softc[unit]; 168 int retval; 169 170 if (sc->sc_flags & MTF_STATTIMEO) 171 goto getstats; 172 retval = hpibrecv(sc->sc_hpibno, 173 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 174 MTT_DSJ, &(sc->sc_lastdsj), 1); 175 sc->sc_flags &= ~MTF_DSJTIMEO; 176 if (retval != 1) { 177 dlog(LOG_DEBUG, "mt%d can't hpibrecv DSJ\n", unit); 178 if (sc->sc_recvtimeo == 0) 179 sc->sc_recvtimeo = hz; 180 if (--sc->sc_recvtimeo == 0) 181 return (-1); 182 if (retval == 0) 183 sc->sc_flags |= MTF_DSJTIMEO; 184 return (-2); 185 } 186 sc->sc_recvtimeo = 0; 187 sc->sc_statindex = 0; 188 dlog(LOG_DEBUG, "mt%d readdsj: 0x%x\n", unit, sc->sc_lastdsj); 189 sc->sc_lastecmd = ecmd; 190 switch (sc->sc_lastdsj) { 191 case 0: 192 if (ecmd & MTE_DSJ_FORCE) 193 break; 194 return (0); 195 196 case 2: 197 sc->sc_lastecmd = MTE_COMPLETE; 198 case 1: 199 break; 200 201 default: 202 log(LOG_ERR, "mt%d readdsj: DSJ 0x%x\n", unit, sc->sc_lastdsj); 203 return (-1); 204 } 205 getstats: 206 retval = hpibrecv(sc->sc_hpibno, 207 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, 208 MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex, 209 sizeof(sc->sc_stat) - sc->sc_statindex); 210 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 211 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 212 if (sc->sc_recvtimeo == 0) 213 sc->sc_recvtimeo = hz; 214 if (--sc->sc_recvtimeo != 0) { 215 if (retval >= 0) { 216 sc->sc_statindex += retval; 217 sc->sc_flags |= MTF_STATCONT; 218 } 219 sc->sc_flags |= MTF_STATTIMEO; 220 return (-2); 221 } 222 log(LOG_ERR, "mt%d readdsj: can't read status\n", unit); 223 return (-1); 224 } 225 sc->sc_recvtimeo = 0; 226 sc->sc_statindex = 0; 227 dlog(LOG_DEBUG, "mt%d readdsj: status is %x %x %x %x %x %x\n", unit, 228 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 229 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6); 230 if (sc->sc_lastecmd) 231 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, 232 MTL_ECMD, &(sc->sc_lastecmd), 1); 233 return ((int) sc->sc_lastdsj); 234 } 235 236 mtopen(dev, flag, mode, p) 237 dev_t dev; 238 int flag, mode; 239 struct proc *p; 240 { 241 register int unit = UNIT(dev); 242 register struct mt_softc *sc = &mt_softc[unit]; 243 register int req_den; 244 int error; 245 246 dlog(LOG_DEBUG, "mt%d open: flags 0x%x\n", unit, sc->sc_flags); 247 if (unit >= NMT || (sc->sc_flags & MTF_EXISTS) == 0) 248 return (ENXIO); 249 if (sc->sc_flags & MTF_OPEN) 250 return (EBUSY); 251 sc->sc_flags |= MTF_OPEN; 252 sc->sc_ttyp = tprintf_open(p); 253 if ((sc->sc_flags & MTF_ALIVE) == 0) { 254 error = mtcommand(dev, MTRESET, 0); 255 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 256 goto errout; 257 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 258 (void) mtcommand(dev, MTREW, 0); 259 } 260 for (;;) { 261 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 262 goto errout; 263 if (!(sc->sc_flags & MTF_REW)) 264 break; 265 if (tsleep((caddr_t) &lbolt, PCATCH | (PZERO + 1), "mt", 0) != 0) { 266 error = EINTR; 267 goto errout; 268 } 269 } 270 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 271 error = EROFS; 272 goto errout; 273 } 274 if (!(sc->sc_stat1 & SR1_ONLINE)) { 275 uprintf("%s: not online\n", sc->sc_hd->hp_xname); 276 error = EIO; 277 goto errout; 278 } 279 /* 280 * Select density: 281 * - find out what density the drive is set to 282 * (i.e. the density of the current tape) 283 * - if we are going to write 284 * - if we're not at the beginning of the tape 285 * - complain if we want to change densities 286 * - otherwise, select the mtcommand to set the density 287 * 288 * If the drive doesn't support it then don't change the recorded 289 * density. 290 * 291 * The original MOREbsd code had these additional conditions 292 * for the mid-tape change 293 * 294 * req_den != T_BADBPI && 295 * sc->sc_density != T_6250BPI 296 * 297 * which suggests that it would be possible to write multiple 298 * densities if req_den == T_BAD_BPI or the current tape 299 * density was 6250. Testing of our 7980 suggests that the 300 * device cannot change densities mid-tape. 301 * 302 * ajv (at) comp.vuw.ac.nz 303 */ 304 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 305 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 306 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 307 req_den = (dev & T_DENSEL); 308 309 if (flag & FWRITE) { 310 if (!(sc->sc_stat1 & SR1_BOT)) { 311 if (sc->sc_density != req_den) { 312 uprintf("%s: can't change density mid-tape\n", 313 sc->sc_hd->hp_xname); 314 error = EIO; 315 goto errout; 316 } 317 } 318 else { 319 int mtset_density = 320 (req_den == T_800BPI ? MTSET800BPI : ( 321 req_den == T_1600BPI ? MTSET1600BPI : ( 322 req_den == T_6250BPI ? MTSET6250BPI : ( 323 sc->sc_type == MT7980ID 324 ? MTSET6250DC 325 : MTSET6250BPI)))); 326 if (mtcommand(dev, mtset_density, 0) == 0) 327 sc->sc_density = req_den; 328 } 329 } 330 return (0); 331 errout: 332 sc->sc_flags &= ~MTF_OPEN; 333 return (error); 334 } 335 336 mtclose(dev, flag) 337 dev_t dev; 338 int flag; 339 { 340 register struct mt_softc *sc = &mt_softc[UNIT(dev)]; 341 342 if (sc->sc_flags & MTF_WRT) { 343 (void) mtcommand(dev, MTWEOF, 2); 344 (void) mtcommand(dev, MTBSF, 0); 345 } 346 if ((minor(dev) & T_NOREWIND) == 0) 347 (void) mtcommand(dev, MTREW, 0); 348 sc->sc_flags &= ~MTF_OPEN; 349 tprintf_close(sc->sc_ttyp); 350 return (0); 351 } 352 353 mtcommand(dev, cmd, cnt) 354 dev_t dev; 355 int cmd; 356 int cnt; 357 { 358 register struct buf *bp = &mtbuf[UNIT(dev)]; 359 int error = 0; 360 361 #if 1 362 if (bp->b_flags & B_BUSY) 363 return (EBUSY); 364 #endif 365 bp->b_cmd = cmd; 366 bp->b_dev = dev; 367 do { 368 bp->b_flags = B_BUSY | B_CMD; 369 mtstrategy(bp); 370 iowait(bp); 371 if (bp->b_flags & B_ERROR) { 372 error = (int) (unsigned) bp->b_error; 373 break; 374 } 375 } while (--cnt > 0); 376 #if 0 377 bp->b_flags = 0 /*&= ~B_BUSY*/; 378 #else 379 bp->b_flags &= ~B_BUSY; 380 #endif 381 return (error); 382 } 383 384 /* 385 * Only thing to check here is for legal record lengths (writes only). 386 */ 387 void 388 mtstrategy(bp) 389 register struct buf *bp; 390 { 391 register struct mt_softc *sc; 392 register struct buf *dp; 393 register int unit; 394 register int s; 395 396 unit = UNIT(bp->b_dev); 397 sc = &mt_softc[unit]; 398 dlog(LOG_DEBUG, "mt%d strategy\n", unit); 399 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 400 #define WRITE_BITS_IGNORED 8 401 #if 0 402 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 403 tprintf(sc->sc_ttyp, 404 "%s: write record must be multiple of %d\n", 405 sc->sc_hd->hp_xname, 1 << WRITE_BITS_IGNORED); 406 goto error; 407 } 408 #endif 409 s = 16 * 1024; 410 if (sc->sc_stat2 & SR2_LONGREC) { 411 switch (sc->sc_density) { 412 case T_1600BPI: 413 s = 32 * 1024; 414 break; 415 416 case T_6250BPI: 417 case T_BADBPI: 418 s = 60 * 1024; 419 break; 420 } 421 } 422 if (bp->b_bcount > s) { 423 tprintf(sc->sc_ttyp, 424 "%s: write record (%d) too big: limit (%d)\n", 425 sc->sc_hd->hp_xname, bp->b_bcount, s); 426 error: 427 bp->b_flags |= B_ERROR; 428 bp->b_error = EIO; 429 iodone(bp); 430 return; 431 } 432 } 433 dp = &mttab[unit]; 434 bp->b_actf = NULL; 435 s = splbio(); 436 bp->b_actb = dp->b_actb; 437 *dp->b_actb = bp; 438 dp->b_actb = &bp->b_actf; 439 if (dp->b_active == 0) { 440 dp->b_active = 1; 441 mtustart(unit); 442 } 443 splx(s); 444 } 445 446 void 447 mtustart(unit) 448 register int unit; 449 { 450 451 dlog(LOG_DEBUG, "mt%d ustart\n", unit); 452 if (hpibreq(&(mt_softc[unit].sc_dq))) 453 mtstart(unit); 454 } 455 456 #define hpibppclear(unit) \ 457 { hpib_softc[unit].sc_flags &= ~HPIBF_PPOLL; } 458 459 void 460 spl_mtintr(arg) 461 void *arg; 462 { 463 struct mt_softc *sc = arg; 464 int s = splbio(); 465 466 hpibppclear(sc->sc_hpibno); 467 mtintr(sc); 468 (void) splx(s); 469 } 470 471 void 472 spl_mtstart(unit) 473 int unit; 474 { 475 int s = splbio(); 476 477 mtstart(unit); 478 (void) splx(s); 479 } 480 481 void 482 mtstart(unit) 483 register int unit; 484 { 485 register struct mt_softc *sc = &mt_softc[unit]; 486 register struct buf *bp, *dp; 487 short cmdcount = 1; 488 u_char cmdbuf[2]; 489 490 dlog(LOG_DEBUG, "mt%d start\n", unit); 491 sc->sc_flags &= ~MTF_WRT; 492 bp = mttab[unit].b_actf; 493 if ((sc->sc_flags & MTF_ALIVE) == 0 && 494 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 495 goto fatalerror; 496 497 if (sc->sc_flags & MTF_REW) { 498 if (!hpibpptest(sc->sc_hpibno, sc->sc_slave)) 499 goto stillrew; 500 switch (mtreaddsj(unit, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 501 case 0: 502 case 1: 503 stillrew: 504 if ((sc->sc_stat1 & SR1_BOT) || 505 !(sc->sc_stat1 & SR1_ONLINE)) { 506 sc->sc_flags &= ~MTF_REW; 507 break; 508 } 509 case -2: 510 /* 511 * -2 means "timeout" reading DSJ, which is probably 512 * temporary. This is considered OK when doing a NOP, 513 * but not otherwise. 514 */ 515 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 516 timeout(spl_mtstart, (void *)unit, hz >> 5); 517 return; 518 } 519 case 2: 520 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 521 bp->b_error = EBUSY; 522 goto errdone; 523 } 524 goto done; 525 526 default: 527 goto fatalerror; 528 } 529 } 530 if (bp->b_flags & B_CMD) { 531 if (sc->sc_flags & MTF_PASTEOT) { 532 switch(bp->b_cmd) { 533 case MTFSF: 534 case MTWEOF: 535 case MTFSR: 536 bp->b_error = ENOSPC; 537 goto errdone; 538 539 case MTBSF: 540 case MTOFFL: 541 case MTBSR: 542 case MTREW: 543 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 544 break; 545 } 546 } 547 switch(bp->b_cmd) { 548 case MTFSF: 549 if (sc->sc_flags & MTF_HITEOF) 550 goto done; 551 cmdbuf[0] = MTTC_FSF; 552 break; 553 554 case MTBSF: 555 if (sc->sc_flags & MTF_HITBOF) 556 goto done; 557 cmdbuf[0] = MTTC_BSF; 558 break; 559 560 case MTOFFL: 561 sc->sc_flags |= MTF_REW; 562 cmdbuf[0] = MTTC_REWOFF; 563 break; 564 565 case MTWEOF: 566 cmdbuf[0] = MTTC_WFM; 567 break; 568 569 case MTBSR: 570 cmdbuf[0] = MTTC_BSR; 571 break; 572 573 case MTFSR: 574 cmdbuf[0] = MTTC_FSR; 575 break; 576 577 case MTREW: 578 sc->sc_flags |= MTF_REW; 579 cmdbuf[0] = MTTC_REW; 580 break; 581 582 case MTNOP: 583 /* 584 * NOP is supposed to set status bits. 585 * Force readdsj to do it. 586 */ 587 switch (mtreaddsj(unit, 588 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 589 default: 590 goto done; 591 592 case -1: 593 /* 594 * If this fails, perform a device clear 595 * to fix any protocol problems and (most 596 * likely) get the status. 597 */ 598 bp->b_cmd = MTRESET; 599 break; 600 601 case -2: 602 timeout(spl_mtstart, (void *)unit, hz >> 5); 603 return; 604 } 605 606 case MTRESET: 607 /* 608 * 1) selected device clear (send with "-2" secondary) 609 * 2) set timeout, then wait for "service request" 610 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 611 */ 612 if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){ 613 log(LOG_ERR, "mt%d can't reset\n", unit); 614 goto fatalerror; 615 } 616 timeout(spl_mtintr, (void *)sc, 4 * hz); 617 hpibawait(sc->sc_hpibno, sc->sc_slave); 618 return; 619 620 case MTSET800BPI: 621 cmdbuf[0] = MTTC_800; 622 break; 623 624 case MTSET1600BPI: 625 cmdbuf[0] = MTTC_1600; 626 break; 627 628 case MTSET6250BPI: 629 cmdbuf[0] = MTTC_6250; 630 break; 631 632 case MTSET6250DC: 633 cmdbuf[0] = MTTC_DC6250; 634 break; 635 } 636 } else { 637 if (sc->sc_flags & MTF_PASTEOT) { 638 bp->b_error = ENOSPC; 639 goto errdone; 640 } 641 if (bp->b_flags & B_READ) { 642 sc->sc_flags |= MTF_IO; 643 cmdbuf[0] = MTTC_READ; 644 } else { 645 sc->sc_flags |= MTF_WRT | MTF_IO; 646 cmdbuf[0] = MTTC_WRITE; 647 cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 648 cmdcount = 2; 649 } 650 } 651 if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 652 == cmdcount) { 653 if (sc->sc_flags & MTF_REW) 654 goto done; 655 hpibawait(sc->sc_hpibno); 656 return; 657 } 658 fatalerror: 659 /* 660 * If anything fails, the drive is probably hosed, so mark it not 661 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 662 * if, last we heard, it was REWinding, remember that). 663 */ 664 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 665 bp->b_error = EIO; 666 errdone: 667 bp->b_flags |= B_ERROR; 668 done: 669 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 670 iodone(bp); 671 if (dp = bp->b_actf) 672 dp->b_actb = bp->b_actb; 673 else 674 mttab[unit].b_actb = bp->b_actb; 675 *bp->b_actb = dp; 676 hpibfree(&(sc->sc_dq)); 677 if ((bp = dp) == NULL) 678 mttab[unit].b_active = 0; 679 else 680 mtustart(unit); 681 } 682 683 /* 684 * The Utah code had a bug which meant that the driver was unable to read. 685 * "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized. 686 * -- ajv (at) comp.vuw.ac.nz 687 */ 688 void 689 mtgo(unit) 690 register int unit; 691 { 692 register struct mt_softc *sc = &mt_softc[unit]; 693 register struct buf *bp; 694 int rw; 695 696 dlog(LOG_DEBUG, "mt%d go\n", unit); 697 bp = mttab[unit].b_actf; 698 rw = bp->b_flags & B_READ; 699 hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE, 700 bp->b_un.b_addr, bp->b_bcount, rw, rw != 0); 701 } 702 703 int 704 mtintr(arg) 705 void *arg; 706 { 707 register struct mt_softc *sc = arg; 708 register struct buf *bp, *dp; 709 register int i; 710 int unit = sc->sc_hd->hp_unit; 711 u_char cmdbuf[4]; 712 713 bp = mttab[unit].b_actf; 714 if (bp == NULL) { 715 log(LOG_ERR, "mt%d intr: bp == NULL\n", unit); 716 return; 717 } 718 dlog(LOG_DEBUG, "mt%d intr\n", unit); 719 /* 720 * Some operation completed. Read status bytes and report errors. 721 * Clear EOF flags here `cause they're set once on specific conditions 722 * below when a command succeeds. 723 * A DSJ of 2 always means keep waiting. If the command was READ 724 * (and we're in data DMA phase) stop data transfer first. 725 */ 726 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 727 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 728 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 729 cmdbuf[0] = MTE_STOP; 730 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1); 731 } 732 switch (mtreaddsj(unit, 0)) { 733 case 0: 734 break; 735 736 case 1: 737 /* 738 * If we're in the middle of a READ/WRITE and have yet to 739 * start the data transfer, a DSJ of one should terminate it. 740 */ 741 sc->sc_flags &= ~MTF_IO; 742 break; 743 744 case 2: 745 (void) hpibawait(sc->sc_hpibno); 746 return; 747 748 case -2: 749 /* 750 * -2 means that the drive failed to respond quickly enough 751 * to the request for DSJ. It's probably just "busy" figuring 752 * it out and will know in a little bit... 753 */ 754 timeout(spl_mtintr, (void *)sc, hz >> 5); 755 return; 756 757 default: 758 log(LOG_ERR, "mt%d intr: can't get drive stat\n", unit); 759 goto error; 760 } 761 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 762 i = sc->sc_stat4 & SR4_ERCLMASK; 763 log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d\n", 764 sc->sc_hd->hp_xname, i == SR4_DEVICE ? "device" : 765 (i == SR4_PROTOCOL ? "protocol" : 766 (i == SR4_SELFTEST ? "selftest" : "unknown")), 767 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 768 sc->sc_stat3, sc->sc_stat5); 769 770 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 771 untimeout(spl_mtintr, (void *)sc); 772 if (sc->sc_stat3 & SR3_POWERUP) 773 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 774 goto error; 775 } 776 /* 777 * Report and clear any soft errors. 778 */ 779 if (sc->sc_stat1 & SR1_SOFTERR) { 780 log(LOG_WARNING, "%s: soft error, retry %d\n", 781 sc->sc_hd->hp_xname, sc->sc_stat4 & SR4_RETRYMASK); 782 sc->sc_stat1 &= ~SR1_SOFTERR; 783 } 784 /* 785 * We've initiated a read or write, but haven't actually started to 786 * DMA the data yet. At this point, the drive's ready. 787 */ 788 if (sc->sc_flags & MTF_IO) { 789 sc->sc_flags &= ~MTF_IO; 790 if (hpibustart(sc->sc_hpibno)) 791 mtgo(unit); 792 return; 793 } 794 /* 795 * Check for End Of Tape - we're allowed to hit EOT and then write (or 796 * read) one more record. If we get here and have not already hit EOT, 797 * return ENOSPC to inform the process that it's hit it. If we get 798 * here and HAVE already hit EOT, don't allow any more operations that 799 * move the tape forward. 800 */ 801 if (sc->sc_stat1 & SR1_EOT) { 802 if (sc->sc_flags & MTF_ATEOT) 803 sc->sc_flags |= MTF_PASTEOT; 804 else { 805 bp->b_flags |= B_ERROR; 806 bp->b_error = ENOSPC; 807 sc->sc_flags |= MTF_ATEOT; 808 } 809 } 810 /* 811 * If a motion command was being executed, check for Tape Marks. 812 * If we were doing data, make sure we got the right amount, and 813 * check for hitting tape marks on reads. 814 */ 815 if (bp->b_flags & B_CMD) { 816 if (sc->sc_stat1 & SR1_EOF) { 817 if (bp->b_cmd == MTFSR) 818 sc->sc_flags |= MTF_HITEOF; 819 if (bp->b_cmd == MTBSR) 820 sc->sc_flags |= MTF_HITBOF; 821 } 822 if (bp->b_cmd == MTRESET) { 823 untimeout(spl_mtintr, (void *)sc); 824 sc->sc_flags |= MTF_ALIVE; 825 } 826 } else { 827 i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2); 828 if (i != 2) { 829 log(LOG_ERR, "mt%d intr: can't get xfer length\n"); 830 goto error; 831 } 832 i = (int) *((u_short *) cmdbuf); 833 if (i <= bp->b_bcount) { 834 if (i == 0) 835 sc->sc_flags |= MTF_HITEOF; 836 bp->b_resid = bp->b_bcount - i; 837 dlog(LOG_DEBUG, "mt%d intr: bcount %d, resid %d\n", 838 unit, bp->b_bcount, bp->b_resid); 839 } else { 840 tprintf(sc->sc_ttyp, 841 "%s: record (%d) larger than wanted (%d)\n", 842 sc->sc_hd->hp_xname, i, bp->b_bcount); 843 error: 844 sc->sc_flags &= ~MTF_IO; 845 bp->b_error = EIO; 846 bp->b_flags |= B_ERROR; 847 } 848 } 849 /* 850 * The operation is completely done. 851 * Let the drive know with an END command. 852 */ 853 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 854 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1); 855 bp->b_flags &= ~B_CMD; 856 iodone(bp); 857 if (dp = bp->b_actf) 858 dp->b_actb = bp->b_actb; 859 else 860 mttab[unit].b_actb = bp->b_actb; 861 *bp->b_actb = dp; 862 hpibfree(&(sc->sc_dq)); 863 #if 0 864 if (bp /*mttab[unit].b_actf*/ == NULL) 865 #else 866 if (mttab[unit].b_actf == NULL) 867 #endif 868 mttab[unit].b_active = 0; 869 else 870 mtustart(unit); 871 } 872 873 mtread(dev, uio) 874 dev_t dev; 875 struct uio *uio; 876 { 877 return(physio(mtstrategy, &mtbuf[UNIT(dev)], dev, B_READ, minphys, uio)); 878 } 879 880 mtwrite(dev, uio) 881 dev_t dev; 882 struct uio *uio; 883 { 884 return(physio(mtstrategy, &mtbuf[UNIT(dev)], dev, B_WRITE, minphys, uio)); 885 } 886 887 mtioctl(dev, cmd, data, flag) 888 dev_t dev; 889 u_long cmd; 890 caddr_t data; 891 int flag; 892 { 893 register struct mtop *op; 894 int cnt; 895 896 switch (cmd) { 897 case MTIOCTOP: 898 op = (struct mtop *)data; 899 switch(op->mt_op) { 900 case MTWEOF: 901 case MTFSF: 902 case MTBSR: 903 case MTBSF: 904 case MTFSR: 905 cnt = op->mt_count; 906 break; 907 908 case MTOFFL: 909 case MTREW: 910 case MTNOP: 911 cnt = 0; 912 break; 913 914 default: 915 return (EINVAL); 916 } 917 return (mtcommand(dev, op->mt_op, cnt)); 918 919 case MTIOCGET: 920 break; 921 922 default: 923 return (EINVAL); 924 } 925 return (0); 926 } 927 928 /*ARGSUSED*/ 929 mtdump(dev) 930 dev_t dev; 931 { 932 return(ENXIO); 933 } 934 935 #endif /* NMT > 0 */ 936
Indexes created Wed Sep 24 05:09:52 GMT 2025