mt.c revision 1.3
1 /* $NetBSD: mt.c,v 1.3 1996/02/14 02:44:40 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 } 153 154 /* 155 * Perform a read of "Device Status Jump" register and update the 156 * status if necessary. If status is read, the given "ecmd" is also 157 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 158 * and -2 on "temporary" failure. 159 */ 160 mtreaddsj(unit, ecmd) 161 register int unit; 162 int ecmd; 163 { 164 register struct mt_softc *sc = &mt_softc[unit]; 165 int retval; 166 167 if (sc->sc_flags & MTF_STATTIMEO) 168 goto getstats; 169 retval = hpibrecv(sc->sc_hpibno, 170 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 171 MTT_DSJ, &(sc->sc_lastdsj), 1); 172 sc->sc_flags &= ~MTF_DSJTIMEO; 173 if (retval != 1) { 174 dlog(LOG_DEBUG, "mt%d can't hpibrecv DSJ\n", unit); 175 if (sc->sc_recvtimeo == 0) 176 sc->sc_recvtimeo = hz; 177 if (--sc->sc_recvtimeo == 0) 178 return (-1); 179 if (retval == 0) 180 sc->sc_flags |= MTF_DSJTIMEO; 181 return (-2); 182 } 183 sc->sc_recvtimeo = 0; 184 sc->sc_statindex = 0; 185 dlog(LOG_DEBUG, "mt%d readdsj: 0x%x\n", unit, sc->sc_lastdsj); 186 sc->sc_lastecmd = ecmd; 187 switch (sc->sc_lastdsj) { 188 case 0: 189 if (ecmd & MTE_DSJ_FORCE) 190 break; 191 return (0); 192 193 case 2: 194 sc->sc_lastecmd = MTE_COMPLETE; 195 case 1: 196 break; 197 198 default: 199 log(LOG_ERR, "mt%d readdsj: DSJ 0x%x\n", unit, sc->sc_lastdsj); 200 return (-1); 201 } 202 getstats: 203 retval = hpibrecv(sc->sc_hpibno, 204 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, 205 MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex, 206 sizeof(sc->sc_stat) - sc->sc_statindex); 207 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 208 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 209 if (sc->sc_recvtimeo == 0) 210 sc->sc_recvtimeo = hz; 211 if (--sc->sc_recvtimeo != 0) { 212 if (retval >= 0) { 213 sc->sc_statindex += retval; 214 sc->sc_flags |= MTF_STATCONT; 215 } 216 sc->sc_flags |= MTF_STATTIMEO; 217 return (-2); 218 } 219 log(LOG_ERR, "mt%d readdsj: can't read status\n", unit); 220 return (-1); 221 } 222 sc->sc_recvtimeo = 0; 223 sc->sc_statindex = 0; 224 dlog(LOG_DEBUG, "mt%d readdsj: status is %x %x %x %x %x %x\n", unit, 225 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 226 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6); 227 if (sc->sc_lastecmd) 228 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, 229 MTL_ECMD, &(sc->sc_lastecmd), 1); 230 return ((int) sc->sc_lastdsj); 231 } 232 233 mtopen(dev, flag, mode, p) 234 dev_t dev; 235 int flag, mode; 236 struct proc *p; 237 { 238 register int unit = UNIT(dev); 239 register struct mt_softc *sc = &mt_softc[unit]; 240 register int req_den; 241 int error; 242 243 dlog(LOG_DEBUG, "mt%d open: flags 0x%x\n", unit, sc->sc_flags); 244 if (unit >= NMT || (sc->sc_flags & MTF_EXISTS) == 0) 245 return (ENXIO); 246 if (sc->sc_flags & MTF_OPEN) 247 return (EBUSY); 248 sc->sc_flags |= MTF_OPEN; 249 sc->sc_ttyp = tprintf_open(p); 250 if ((sc->sc_flags & MTF_ALIVE) == 0) { 251 error = mtcommand(dev, MTRESET, 0); 252 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 253 goto errout; 254 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 255 (void) mtcommand(dev, MTREW, 0); 256 } 257 for (;;) { 258 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 259 goto errout; 260 if (!(sc->sc_flags & MTF_REW)) 261 break; 262 if (tsleep((caddr_t) &lbolt, PCATCH | (PZERO + 1), "mt", 0) != 0) { 263 error = EINTR; 264 goto errout; 265 } 266 } 267 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 268 error = EROFS; 269 goto errout; 270 } 271 if (!(sc->sc_stat1 & SR1_ONLINE)) { 272 uprintf("%s: not online\n", sc->sc_hd->hp_xname); 273 error = EIO; 274 goto errout; 275 } 276 /* 277 * Select density: 278 * - find out what density the drive is set to 279 * (i.e. the density of the current tape) 280 * - if we are going to write 281 * - if we're not at the beginning of the tape 282 * - complain if we want to change densities 283 * - otherwise, select the mtcommand to set the density 284 * 285 * If the drive doesn't support it then don't change the recorded 286 * density. 287 * 288 * The original MOREbsd code had these additional conditions 289 * for the mid-tape change 290 * 291 * req_den != T_BADBPI && 292 * sc->sc_density != T_6250BPI 293 * 294 * which suggests that it would be possible to write multiple 295 * densities if req_den == T_BAD_BPI or the current tape 296 * density was 6250. Testing of our 7980 suggests that the 297 * device cannot change densities mid-tape. 298 * 299 * ajv (at) comp.vuw.ac.nz 300 */ 301 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 302 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 303 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 304 req_den = (dev & T_DENSEL); 305 306 if (flag & FWRITE) { 307 if (!(sc->sc_stat1 & SR1_BOT)) { 308 if (sc->sc_density != req_den) { 309 uprintf("%s: can't change density mid-tape\n", 310 sc->sc_hd->hp_xname); 311 error = EIO; 312 goto errout; 313 } 314 } 315 else { 316 int mtset_density = 317 (req_den == T_800BPI ? MTSET800BPI : ( 318 req_den == T_1600BPI ? MTSET1600BPI : ( 319 req_den == T_6250BPI ? MTSET6250BPI : ( 320 sc->sc_type == MT7980ID 321 ? MTSET6250DC 322 : MTSET6250BPI)))); 323 if (mtcommand(dev, mtset_density, 0) == 0) 324 sc->sc_density = req_den; 325 } 326 } 327 return (0); 328 errout: 329 sc->sc_flags &= ~MTF_OPEN; 330 return (error); 331 } 332 333 mtclose(dev, flag) 334 dev_t dev; 335 int flag; 336 { 337 register struct mt_softc *sc = &mt_softc[UNIT(dev)]; 338 339 if (sc->sc_flags & MTF_WRT) { 340 (void) mtcommand(dev, MTWEOF, 2); 341 (void) mtcommand(dev, MTBSF, 0); 342 } 343 if ((minor(dev) & T_NOREWIND) == 0) 344 (void) mtcommand(dev, MTREW, 0); 345 sc->sc_flags &= ~MTF_OPEN; 346 tprintf_close(sc->sc_ttyp); 347 return (0); 348 } 349 350 mtcommand(dev, cmd, cnt) 351 dev_t dev; 352 int cmd; 353 int cnt; 354 { 355 register struct buf *bp = &mtbuf[UNIT(dev)]; 356 int error = 0; 357 358 #if 1 359 if (bp->b_flags & B_BUSY) 360 return (EBUSY); 361 #endif 362 bp->b_cmd = cmd; 363 bp->b_dev = dev; 364 do { 365 bp->b_flags = B_BUSY | B_CMD; 366 mtstrategy(bp); 367 iowait(bp); 368 if (bp->b_flags & B_ERROR) { 369 error = (int) (unsigned) bp->b_error; 370 break; 371 } 372 } while (--cnt > 0); 373 #if 0 374 bp->b_flags = 0 /*&= ~B_BUSY*/; 375 #else 376 bp->b_flags &= ~B_BUSY; 377 #endif 378 return (error); 379 } 380 381 /* 382 * Only thing to check here is for legal record lengths (writes only). 383 */ 384 void 385 mtstrategy(bp) 386 register struct buf *bp; 387 { 388 register struct mt_softc *sc; 389 register struct buf *dp; 390 register int unit; 391 register int s; 392 393 unit = UNIT(bp->b_dev); 394 sc = &mt_softc[unit]; 395 dlog(LOG_DEBUG, "mt%d strategy\n", unit); 396 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 397 #define WRITE_BITS_IGNORED 8 398 #if 0 399 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 400 tprintf(sc->sc_ttyp, 401 "%s: write record must be multiple of %d\n", 402 sc->sc_hd->hp_xname, 1 << WRITE_BITS_IGNORED); 403 goto error; 404 } 405 #endif 406 s = 16 * 1024; 407 if (sc->sc_stat2 & SR2_LONGREC) { 408 switch (sc->sc_density) { 409 case T_1600BPI: 410 s = 32 * 1024; 411 break; 412 413 case T_6250BPI: 414 case T_BADBPI: 415 s = 60 * 1024; 416 break; 417 } 418 } 419 if (bp->b_bcount > s) { 420 tprintf(sc->sc_ttyp, 421 "%s: write record (%d) too big: limit (%d)\n", 422 sc->sc_hd->hp_xname, bp->b_bcount, s); 423 error: 424 bp->b_flags |= B_ERROR; 425 bp->b_error = EIO; 426 iodone(bp); 427 return; 428 } 429 } 430 dp = &mttab[unit]; 431 bp->b_actf = NULL; 432 s = splbio(); 433 bp->b_actb = dp->b_actb; 434 *dp->b_actb = bp; 435 dp->b_actb = &bp->b_actf; 436 if (dp->b_active == 0) { 437 dp->b_active = 1; 438 mtustart(unit); 439 } 440 splx(s); 441 } 442 443 void 444 mtustart(unit) 445 register int unit; 446 { 447 448 dlog(LOG_DEBUG, "mt%d ustart\n", unit); 449 if (hpibreq(&(mt_softc[unit].sc_dq))) 450 mtstart(unit); 451 } 452 453 #define hpibppclear(unit) \ 454 { hpib_softc[unit].sc_flags &= ~HPIBF_PPOLL; } 455 456 void 457 spl_mtintr(arg) 458 void *arg; 459 { 460 struct mt_softc *sc = arg; 461 int s = splbio(); 462 463 hpibppclear(sc->sc_hpibno); 464 mtintr(sc); 465 (void) splx(s); 466 } 467 468 void 469 spl_mtstart(unit) 470 int unit; 471 { 472 int s = splbio(); 473 474 mtstart(unit); 475 (void) splx(s); 476 } 477 478 void 479 mtstart(unit) 480 register int unit; 481 { 482 register struct mt_softc *sc = &mt_softc[unit]; 483 register struct buf *bp, *dp; 484 short cmdcount = 1; 485 u_char cmdbuf[2]; 486 487 dlog(LOG_DEBUG, "mt%d start\n", unit); 488 sc->sc_flags &= ~MTF_WRT; 489 bp = mttab[unit].b_actf; 490 if ((sc->sc_flags & MTF_ALIVE) == 0 && 491 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 492 goto fatalerror; 493 494 if (sc->sc_flags & MTF_REW) { 495 if (!hpibpptest(sc->sc_hpibno, sc->sc_slave)) 496 goto stillrew; 497 switch (mtreaddsj(unit, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 498 case 0: 499 case 1: 500 stillrew: 501 if ((sc->sc_stat1 & SR1_BOT) || 502 !(sc->sc_stat1 & SR1_ONLINE)) { 503 sc->sc_flags &= ~MTF_REW; 504 break; 505 } 506 case -2: 507 /* 508 * -2 means "timeout" reading DSJ, which is probably 509 * temporary. This is considered OK when doing a NOP, 510 * but not otherwise. 511 */ 512 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 513 timeout(spl_mtstart, (void *)unit, hz >> 5); 514 return; 515 } 516 case 2: 517 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 518 bp->b_error = EBUSY; 519 goto errdone; 520 } 521 goto done; 522 523 default: 524 goto fatalerror; 525 } 526 } 527 if (bp->b_flags & B_CMD) { 528 if (sc->sc_flags & MTF_PASTEOT) { 529 switch(bp->b_cmd) { 530 case MTFSF: 531 case MTWEOF: 532 case MTFSR: 533 bp->b_error = ENOSPC; 534 goto errdone; 535 536 case MTBSF: 537 case MTOFFL: 538 case MTBSR: 539 case MTREW: 540 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 541 break; 542 } 543 } 544 switch(bp->b_cmd) { 545 case MTFSF: 546 if (sc->sc_flags & MTF_HITEOF) 547 goto done; 548 cmdbuf[0] = MTTC_FSF; 549 break; 550 551 case MTBSF: 552 if (sc->sc_flags & MTF_HITBOF) 553 goto done; 554 cmdbuf[0] = MTTC_BSF; 555 break; 556 557 case MTOFFL: 558 sc->sc_flags |= MTF_REW; 559 cmdbuf[0] = MTTC_REWOFF; 560 break; 561 562 case MTWEOF: 563 cmdbuf[0] = MTTC_WFM; 564 break; 565 566 case MTBSR: 567 cmdbuf[0] = MTTC_BSR; 568 break; 569 570 case MTFSR: 571 cmdbuf[0] = MTTC_FSR; 572 break; 573 574 case MTREW: 575 sc->sc_flags |= MTF_REW; 576 cmdbuf[0] = MTTC_REW; 577 break; 578 579 case MTNOP: 580 /* 581 * NOP is supposed to set status bits. 582 * Force readdsj to do it. 583 */ 584 switch (mtreaddsj(unit, 585 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 586 default: 587 goto done; 588 589 case -1: 590 /* 591 * If this fails, perform a device clear 592 * to fix any protocol problems and (most 593 * likely) get the status. 594 */ 595 bp->b_cmd = MTRESET; 596 break; 597 598 case -2: 599 timeout(spl_mtstart, (void *)unit, hz >> 5); 600 return; 601 } 602 603 case MTRESET: 604 /* 605 * 1) selected device clear (send with "-2" secondary) 606 * 2) set timeout, then wait for "service request" 607 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 608 */ 609 if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){ 610 log(LOG_ERR, "mt%d can't reset\n", unit); 611 goto fatalerror; 612 } 613 timeout(spl_mtintr, (void *)sc, 4 * hz); 614 hpibawait(sc->sc_hpibno, sc->sc_slave); 615 return; 616 617 case MTSET800BPI: 618 cmdbuf[0] = MTTC_800; 619 break; 620 621 case MTSET1600BPI: 622 cmdbuf[0] = MTTC_1600; 623 break; 624 625 case MTSET6250BPI: 626 cmdbuf[0] = MTTC_6250; 627 break; 628 629 case MTSET6250DC: 630 cmdbuf[0] = MTTC_DC6250; 631 break; 632 } 633 } else { 634 if (sc->sc_flags & MTF_PASTEOT) { 635 bp->b_error = ENOSPC; 636 goto errdone; 637 } 638 if (bp->b_flags & B_READ) { 639 sc->sc_flags |= MTF_IO; 640 cmdbuf[0] = MTTC_READ; 641 } else { 642 sc->sc_flags |= MTF_WRT | MTF_IO; 643 cmdbuf[0] = MTTC_WRITE; 644 cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 645 cmdcount = 2; 646 } 647 } 648 if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 649 == cmdcount) { 650 if (sc->sc_flags & MTF_REW) 651 goto done; 652 hpibawait(sc->sc_hpibno); 653 return; 654 } 655 fatalerror: 656 /* 657 * If anything fails, the drive is probably hosed, so mark it not 658 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 659 * if, last we heard, it was REWinding, remember that). 660 */ 661 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 662 bp->b_error = EIO; 663 errdone: 664 bp->b_flags |= B_ERROR; 665 done: 666 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 667 iodone(bp); 668 if (dp = bp->b_actf) 669 dp->b_actb = bp->b_actb; 670 else 671 mttab[unit].b_actb = bp->b_actb; 672 *bp->b_actb = dp; 673 hpibfree(&(sc->sc_dq)); 674 if ((bp = dp) == NULL) 675 mttab[unit].b_active = 0; 676 else 677 mtustart(unit); 678 } 679 680 /* 681 * The Utah code had a bug which meant that the driver was unable to read. 682 * "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized. 683 * -- ajv (at) comp.vuw.ac.nz 684 */ 685 void 686 mtgo(unit) 687 register int unit; 688 { 689 register struct mt_softc *sc = &mt_softc[unit]; 690 register struct buf *bp; 691 int rw; 692 693 dlog(LOG_DEBUG, "mt%d go\n", unit); 694 bp = mttab[unit].b_actf; 695 rw = bp->b_flags & B_READ; 696 hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE, 697 bp->b_un.b_addr, bp->b_bcount, rw, rw != 0); 698 } 699 700 int 701 mtintr(arg) 702 void *arg; 703 { 704 register struct mt_softc *sc = arg; 705 register struct buf *bp, *dp; 706 register int i; 707 int unit = sc->sc_hd->hp_unit; 708 u_char cmdbuf[4]; 709 710 bp = mttab[unit].b_actf; 711 if (bp == NULL) { 712 log(LOG_ERR, "mt%d intr: bp == NULL\n", unit); 713 return; 714 } 715 dlog(LOG_DEBUG, "mt%d intr\n", unit); 716 /* 717 * Some operation completed. Read status bytes and report errors. 718 * Clear EOF flags here `cause they're set once on specific conditions 719 * below when a command succeeds. 720 * A DSJ of 2 always means keep waiting. If the command was READ 721 * (and we're in data DMA phase) stop data transfer first. 722 */ 723 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 724 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 725 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 726 cmdbuf[0] = MTE_STOP; 727 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1); 728 } 729 switch (mtreaddsj(unit, 0)) { 730 case 0: 731 break; 732 733 case 1: 734 /* 735 * If we're in the middle of a READ/WRITE and have yet to 736 * start the data transfer, a DSJ of one should terminate it. 737 */ 738 sc->sc_flags &= ~MTF_IO; 739 break; 740 741 case 2: 742 (void) hpibawait(sc->sc_hpibno); 743 return; 744 745 case -2: 746 /* 747 * -2 means that the drive failed to respond quickly enough 748 * to the request for DSJ. It's probably just "busy" figuring 749 * it out and will know in a little bit... 750 */ 751 timeout(spl_mtintr, (void *)sc, hz >> 5); 752 return; 753 754 default: 755 log(LOG_ERR, "mt%d intr: can't get drive stat\n", unit); 756 goto error; 757 } 758 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 759 i = sc->sc_stat4 & SR4_ERCLMASK; 760 log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d\n", 761 sc->sc_hd->hp_xname, i == SR4_DEVICE ? "device" : 762 (i == SR4_PROTOCOL ? "protocol" : 763 (i == SR4_SELFTEST ? "selftest" : "unknown")), 764 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 765 sc->sc_stat3, sc->sc_stat5); 766 767 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 768 untimeout(spl_mtintr, (void *)sc); 769 if (sc->sc_stat3 & SR3_POWERUP) 770 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 771 goto error; 772 } 773 /* 774 * Report and clear any soft errors. 775 */ 776 if (sc->sc_stat1 & SR1_SOFTERR) { 777 log(LOG_WARNING, "%s: soft error, retry %d\n", 778 sc->sc_hd->hp_xname, sc->sc_stat4 & SR4_RETRYMASK); 779 sc->sc_stat1 &= ~SR1_SOFTERR; 780 } 781 /* 782 * We've initiated a read or write, but haven't actually started to 783 * DMA the data yet. At this point, the drive's ready. 784 */ 785 if (sc->sc_flags & MTF_IO) { 786 sc->sc_flags &= ~MTF_IO; 787 if (hpibustart(sc->sc_hpibno)) 788 mtgo(unit); 789 return; 790 } 791 /* 792 * Check for End Of Tape - we're allowed to hit EOT and then write (or 793 * read) one more record. If we get here and have not already hit EOT, 794 * return ENOSPC to inform the process that it's hit it. If we get 795 * here and HAVE already hit EOT, don't allow any more operations that 796 * move the tape forward. 797 */ 798 if (sc->sc_stat1 & SR1_EOT) { 799 if (sc->sc_flags & MTF_ATEOT) 800 sc->sc_flags |= MTF_PASTEOT; 801 else { 802 bp->b_flags |= B_ERROR; 803 bp->b_error = ENOSPC; 804 sc->sc_flags |= MTF_ATEOT; 805 } 806 } 807 /* 808 * If a motion command was being executed, check for Tape Marks. 809 * If we were doing data, make sure we got the right amount, and 810 * check for hitting tape marks on reads. 811 */ 812 if (bp->b_flags & B_CMD) { 813 if (sc->sc_stat1 & SR1_EOF) { 814 if (bp->b_cmd == MTFSR) 815 sc->sc_flags |= MTF_HITEOF; 816 if (bp->b_cmd == MTBSR) 817 sc->sc_flags |= MTF_HITBOF; 818 } 819 if (bp->b_cmd == MTRESET) { 820 untimeout(spl_mtintr, (void *)sc); 821 sc->sc_flags |= MTF_ALIVE; 822 } 823 } else { 824 i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2); 825 if (i != 2) { 826 log(LOG_ERR, "mt%d intr: can't get xfer length\n"); 827 goto error; 828 } 829 i = (int) *((u_short *) cmdbuf); 830 if (i <= bp->b_bcount) { 831 if (i == 0) 832 sc->sc_flags |= MTF_HITEOF; 833 bp->b_resid = bp->b_bcount - i; 834 dlog(LOG_DEBUG, "mt%d intr: bcount %d, resid %d\n", 835 unit, bp->b_bcount, bp->b_resid); 836 } else { 837 tprintf(sc->sc_ttyp, 838 "%s: record (%d) larger than wanted (%d)\n", 839 sc->sc_hd->hp_xname, i, bp->b_bcount); 840 error: 841 sc->sc_flags &= ~MTF_IO; 842 bp->b_error = EIO; 843 bp->b_flags |= B_ERROR; 844 } 845 } 846 /* 847 * The operation is completely done. 848 * Let the drive know with an END command. 849 */ 850 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 851 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1); 852 bp->b_flags &= ~B_CMD; 853 iodone(bp); 854 if (dp = bp->b_actf) 855 dp->b_actb = bp->b_actb; 856 else 857 mttab[unit].b_actb = bp->b_actb; 858 *bp->b_actb = dp; 859 hpibfree(&(sc->sc_dq)); 860 #if 0 861 if (bp /*mttab[unit].b_actf*/ == NULL) 862 #else 863 if (mttab[unit].b_actf == NULL) 864 #endif 865 mttab[unit].b_active = 0; 866 else 867 mtustart(unit); 868 } 869 870 mtread(dev, uio) 871 dev_t dev; 872 struct uio *uio; 873 { 874 return(physio(mtstrategy, &mtbuf[UNIT(dev)], dev, B_READ, minphys, uio)); 875 } 876 877 mtwrite(dev, uio) 878 dev_t dev; 879 struct uio *uio; 880 { 881 return(physio(mtstrategy, &mtbuf[UNIT(dev)], dev, B_WRITE, minphys, uio)); 882 } 883 884 mtioctl(dev, cmd, data, flag) 885 dev_t dev; 886 u_long cmd; 887 caddr_t data; 888 int flag; 889 { 890 register struct mtop *op; 891 int cnt; 892 893 switch (cmd) { 894 case MTIOCTOP: 895 op = (struct mtop *)data; 896 switch(op->mt_op) { 897 case MTWEOF: 898 case MTFSF: 899 case MTBSR: 900 case MTBSF: 901 case MTFSR: 902 cnt = op->mt_count; 903 break; 904 905 case MTOFFL: 906 case MTREW: 907 case MTNOP: 908 cnt = 0; 909 break; 910 911 default: 912 return (EINVAL); 913 } 914 return (mtcommand(dev, op->mt_op, cnt)); 915 916 case MTIOCGET: 917 break; 918 919 default: 920 return (EINVAL); 921 } 922 return (0); 923 } 924 925 /*ARGSUSED*/ 926 mtdump(dev) 927 dev_t dev; 928 { 929 return(ENXIO); 930 } 931 932 #endif /* NMT > 0 */ 933
Indexes created Thu Sep 25 15:09:46 GMT 2025