mt.c revision 1.11
1 /* $NetBSD: mt.c,v 1.11 2000/01/21 23:29:03 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1992, The University of Utah and 41 * the Computer Systems Laboratory at the University of Utah (CSL). 42 * All rights reserved. 43 * 44 * Permission to use, copy, modify and distribute this software is hereby 45 * granted provided that (1) source code retains these copyright, permission, 46 * and disclaimer notices, and (2) redistributions including binaries 47 * reproduce the notices in supporting documentation, and (3) all advertising 48 * materials mentioning features or use of this software display the following 49 * acknowledgement: ``This product includes software developed by the 50 * Computer Systems Laboratory at the University of Utah.'' 51 * 52 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS 53 * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF 54 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 55 * 56 * CSL requests users of this software to return to csl-dist (at) cs.utah.edu any 57 * improvements that they make and grant CSL redistribution rights. 58 * 59 * Utah $Hdr: mt.c 1.8 95/09/12$ 60 */ 61 /* @(#)mt.c 3.9 90/07/10 mt Xinu 62 * 63 * Magnetic tape driver (7974a, 7978a/b, 7979a, 7980a, 7980xc) 64 * Original version contributed by Mt. Xinu. 65 * Modified for 4.4BSD by Mark Davies and Andrew Vignaux, Department of 66 * Computer Science, Victoria University of Wellington 67 */ 68 69 #include <sys/param.h> 70 #include <sys/systm.h> 71 #include <sys/buf.h> 72 #include <sys/ioctl.h> 73 #include <sys/mtio.h> 74 #include <sys/file.h> 75 #include <sys/proc.h> 76 #include <sys/errno.h> 77 #include <sys/syslog.h> 78 #include <sys/tty.h> 79 #include <sys/kernel.h> 80 #include <sys/tprintf.h> 81 #include <sys/device.h> 82 #include <sys/conf.h> 83 84 #include <hp300/dev/hpibvar.h> 85 86 #include <hp300/dev/mtreg.h> 87 88 struct mtinfo { 89 u_short hwid; 90 char *desc; 91 } mtinfo[] = { 92 { MT7978ID, "7978" }, 93 { MT7979AID, "7979A" }, 94 { MT7980ID, "7980" }, 95 { MT7974AID, "7974A" }, 96 }; 97 int nmtinfo = sizeof(mtinfo) / sizeof(mtinfo[0]); 98 99 struct mt_softc { 100 struct device sc_dev; 101 int sc_hpibno; /* logical HPIB this slave it attached to */ 102 int sc_slave; /* HPIB slave address (0-6) */ 103 short sc_flags; /* see below */ 104 u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */ 105 u_char sc_lastecmd; /* place for End Command in mtreaddsj() */ 106 short sc_recvtimeo; /* count of hpibsend timeouts to prevent hang */ 107 short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */ 108 struct mt_stat sc_stat;/* status bytes last read from device */ 109 short sc_density; /* current density of tape (mtio.h format) */ 110 short sc_type; /* tape drive model (hardware IDs) */ 111 struct hpibqueue sc_hq; /* HPIB device queue member */ 112 tpr_t sc_ttyp; 113 struct buf_queue sc_tab;/* buf queue */ 114 int sc_active; 115 struct buf sc_bufstore; /* XXX buffer storage */ 116 }; 117 118 #ifdef DEBUG 119 int mtdebug = 0; 120 #define dlog if (mtdebug) log 121 #else 122 #define dlog if (0) log 123 #endif 124 125 #define UNIT(x) (minor(x) & 3) 126 127 #define B_CMD B_XXX /* command buf instead of data */ 128 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */ 129 130 int mtmatch __P((struct device *, struct cfdata *, void *)); 131 void mtattach __P((struct device *, struct device *, void *)); 132 133 struct cfattach mt_ca = { 134 sizeof(struct mt_softc), mtmatch, mtattach 135 }; 136 137 extern struct cfdriver mt_cd; 138 139 int mtident __P((struct mt_softc *, struct hpibbus_attach_args *)); 140 void mtustart __P((struct mt_softc *)); 141 int mtreaddsj __P((struct mt_softc *, int)); 142 int mtcommand __P((dev_t, int, int)); 143 void spl_mtintr __P((void *)); 144 void spl_mtstart __P((void *)); 145 146 void mtstart __P((void *)); 147 void mtgo __P((void *)); 148 void mtintr __P((void *)); 149 150 bdev_decl(mt); 151 cdev_decl(mt); 152 153 int 154 mtmatch(parent, match, aux) 155 struct device *parent; 156 struct cfdata *match; 157 void *aux; 158 { 159 struct hpibbus_attach_args *ha = aux; 160 161 return (mtident(NULL, ha)); 162 } 163 164 void 165 mtattach(parent, self, aux) 166 struct device *parent, *self; 167 void *aux; 168 { 169 struct mt_softc *sc = (struct mt_softc *)self; 170 struct hpibbus_attach_args *ha = aux; 171 int unit, hpibno, slave; 172 173 if (mtident(sc, ha) == 0) { 174 printf("\n%s: impossible!\n", sc->sc_dev.dv_xname); 175 return; 176 } 177 178 unit = self->dv_unit; 179 hpibno = parent->dv_unit; 180 slave = ha->ha_slave; 181 182 BUFQ_INIT(&sc->sc_tab); 183 184 sc->sc_hpibno = hpibno; 185 sc->sc_slave = slave; 186 sc->sc_flags = MTF_EXISTS; 187 188 /* Initialize hpib job queue entry. */ 189 sc->sc_hq.hq_softc = sc; 190 sc->sc_hq.hq_slave = sc->sc_slave; 191 sc->sc_hq.hq_start = mtstart; 192 sc->sc_hq.hq_go = mtgo; 193 sc->sc_hq.hq_intr = mtintr; 194 } 195 196 int 197 mtident(sc, ha) 198 struct mt_softc *sc; 199 struct hpibbus_attach_args *ha; 200 { 201 int i; 202 203 for (i = 0; i < nmtinfo; i++) { 204 if (ha->ha_id == mtinfo[i].hwid) { 205 if (sc != NULL) { 206 sc->sc_type = mtinfo[i].hwid; 207 printf(": %s tape\n", mtinfo[i].desc); 208 } 209 return (1); 210 } 211 } 212 return (0); 213 } 214 215 /* 216 * Perform a read of "Device Status Jump" register and update the 217 * status if necessary. If status is read, the given "ecmd" is also 218 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 219 * and -2 on "temporary" failure. 220 */ 221 int 222 mtreaddsj(sc, ecmd) 223 struct mt_softc *sc; 224 int ecmd; 225 { 226 int retval; 227 228 if (sc->sc_flags & MTF_STATTIMEO) 229 goto getstats; 230 retval = hpibrecv(sc->sc_hpibno, 231 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 232 MTT_DSJ, &(sc->sc_lastdsj), 1); 233 sc->sc_flags &= ~MTF_DSJTIMEO; 234 if (retval != 1) { 235 dlog(LOG_DEBUG, "%s can't hpibrecv DSJ", 236 sc->sc_dev.dv_xname); 237 if (sc->sc_recvtimeo == 0) 238 sc->sc_recvtimeo = hz; 239 if (--sc->sc_recvtimeo == 0) 240 return (-1); 241 if (retval == 0) 242 sc->sc_flags |= MTF_DSJTIMEO; 243 return (-2); 244 } 245 sc->sc_recvtimeo = 0; 246 sc->sc_statindex = 0; 247 dlog(LOG_DEBUG, "%s readdsj: 0x%x", sc->sc_dev.dv_xname, 248 sc->sc_lastdsj); 249 sc->sc_lastecmd = ecmd; 250 switch (sc->sc_lastdsj) { 251 case 0: 252 if (ecmd & MTE_DSJ_FORCE) 253 break; 254 return (0); 255 256 case 2: 257 sc->sc_lastecmd = MTE_COMPLETE; 258 case 1: 259 break; 260 261 default: 262 log(LOG_ERR, "%s readdsj: DSJ 0x%x\n", sc->sc_dev.dv_xname, 263 sc->sc_lastdsj); 264 return (-1); 265 } 266 getstats: 267 retval = hpibrecv(sc->sc_hpibno, 268 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, 269 MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex, 270 sizeof(sc->sc_stat) - sc->sc_statindex); 271 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 272 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 273 if (sc->sc_recvtimeo == 0) 274 sc->sc_recvtimeo = hz; 275 if (--sc->sc_recvtimeo != 0) { 276 if (retval >= 0) { 277 sc->sc_statindex += retval; 278 sc->sc_flags |= MTF_STATCONT; 279 } 280 sc->sc_flags |= MTF_STATTIMEO; 281 return (-2); 282 } 283 log(LOG_ERR, "%s readdsj: can't read status", 284 sc->sc_dev.dv_xname); 285 return (-1); 286 } 287 sc->sc_recvtimeo = 0; 288 sc->sc_statindex = 0; 289 dlog(LOG_DEBUG, "%s readdsj: status is %x %x %x %x %x %x", 290 sc->sc_dev.dv_xname, 291 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 292 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6); 293 if (sc->sc_lastecmd) 294 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, 295 MTL_ECMD, &(sc->sc_lastecmd), 1); 296 return ((int) sc->sc_lastdsj); 297 } 298 299 int 300 mtopen(dev, flag, mode, p) 301 dev_t dev; 302 int flag, mode; 303 struct proc *p; 304 { 305 int unit = UNIT(dev); 306 struct mt_softc *sc; 307 int req_den; 308 int error; 309 310 if (unit >= mt_cd.cd_ndevs || 311 (sc = mt_cd.cd_devs[unit]) == NULL || 312 (sc->sc_flags & MTF_EXISTS) == 0) 313 return (ENXIO); 314 315 dlog(LOG_DEBUG, "%s open: flags 0x%x", sc->sc_dev.dv_xname, 316 sc->sc_flags); 317 if (sc->sc_flags & MTF_OPEN) 318 return (EBUSY); 319 sc->sc_flags |= MTF_OPEN; 320 sc->sc_ttyp = tprintf_open(p); 321 if ((sc->sc_flags & MTF_ALIVE) == 0) { 322 error = mtcommand(dev, MTRESET, 0); 323 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 324 goto errout; 325 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 326 (void) mtcommand(dev, MTREW, 0); 327 } 328 for (;;) { 329 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 330 goto errout; 331 if (!(sc->sc_flags & MTF_REW)) 332 break; 333 if (tsleep((caddr_t) &lbolt, PCATCH | (PZERO + 1), 334 "mt", 0) != 0) { 335 error = EINTR; 336 goto errout; 337 } 338 } 339 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 340 error = EROFS; 341 goto errout; 342 } 343 if (!(sc->sc_stat1 & SR1_ONLINE)) { 344 uprintf("%s: not online\n", sc->sc_dev.dv_xname); 345 error = EIO; 346 goto errout; 347 } 348 /* 349 * Select density: 350 * - find out what density the drive is set to 351 * (i.e. the density of the current tape) 352 * - if we are going to write 353 * - if we're not at the beginning of the tape 354 * - complain if we want to change densities 355 * - otherwise, select the mtcommand to set the density 356 * 357 * If the drive doesn't support it then don't change the recorded 358 * density. 359 * 360 * The original MOREbsd code had these additional conditions 361 * for the mid-tape change 362 * 363 * req_den != T_BADBPI && 364 * sc->sc_density != T_6250BPI 365 * 366 * which suggests that it would be possible to write multiple 367 * densities if req_den == T_BAD_BPI or the current tape 368 * density was 6250. Testing of our 7980 suggests that the 369 * device cannot change densities mid-tape. 370 * 371 * ajv (at) comp.vuw.ac.nz 372 */ 373 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 374 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 375 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 376 req_den = (dev & T_DENSEL); 377 378 if (flag & FWRITE) { 379 if (!(sc->sc_stat1 & SR1_BOT)) { 380 if (sc->sc_density != req_den) { 381 uprintf("%s: can't change density mid-tape\n", 382 sc->sc_dev.dv_xname); 383 error = EIO; 384 goto errout; 385 } 386 } 387 else { 388 int mtset_density = 389 (req_den == T_800BPI ? MTSET800BPI : ( 390 req_den == T_1600BPI ? MTSET1600BPI : ( 391 req_den == T_6250BPI ? MTSET6250BPI : ( 392 sc->sc_type == MT7980ID 393 ? MTSET6250DC 394 : MTSET6250BPI)))); 395 if (mtcommand(dev, mtset_density, 0) == 0) 396 sc->sc_density = req_den; 397 } 398 } 399 return (0); 400 errout: 401 sc->sc_flags &= ~MTF_OPEN; 402 return (error); 403 } 404 405 int 406 mtclose(dev, flag, fmt, p) 407 dev_t dev; 408 int flag, fmt; 409 struct proc *p; 410 { 411 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 412 413 if (sc->sc_flags & MTF_WRT) { 414 (void) mtcommand(dev, MTWEOF, 2); 415 (void) mtcommand(dev, MTBSF, 0); 416 } 417 if ((minor(dev) & T_NOREWIND) == 0) 418 (void) mtcommand(dev, MTREW, 0); 419 sc->sc_flags &= ~MTF_OPEN; 420 tprintf_close(sc->sc_ttyp); 421 return (0); 422 } 423 424 int 425 mtcommand(dev, cmd, cnt) 426 dev_t dev; 427 int cmd; 428 int cnt; 429 { 430 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 431 struct buf *bp = &sc->sc_bufstore; 432 int error = 0; 433 434 #if 1 435 if (bp->b_flags & B_BUSY) 436 return (EBUSY); 437 #endif 438 bp->b_cmd = cmd; 439 bp->b_dev = dev; 440 do { 441 bp->b_flags = B_BUSY | B_CMD; 442 mtstrategy(bp); 443 biowait(bp); 444 if (bp->b_flags & B_ERROR) { 445 error = (int) (unsigned) bp->b_error; 446 break; 447 } 448 } while (--cnt > 0); 449 #if 0 450 bp->b_flags = 0 /*&= ~B_BUSY*/; 451 #else 452 bp->b_flags &= ~B_BUSY; 453 #endif 454 return (error); 455 } 456 457 /* 458 * Only thing to check here is for legal record lengths (writes only). 459 */ 460 void 461 mtstrategy(bp) 462 struct buf *bp; 463 { 464 struct mt_softc *sc; 465 int unit; 466 int s; 467 468 unit = UNIT(bp->b_dev); 469 sc = mt_cd.cd_devs[unit]; 470 dlog(LOG_DEBUG, "%s strategy", sc->sc_dev.dv_xname); 471 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 472 #define WRITE_BITS_IGNORED 8 473 #if 0 474 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 475 tprintf(sc->sc_ttyp, 476 "%s: write record must be multiple of %d\n", 477 sc->sc_dev.dv_xname, 1 << WRITE_BITS_IGNORED); 478 goto error; 479 } 480 #endif 481 s = 16 * 1024; 482 if (sc->sc_stat2 & SR2_LONGREC) { 483 switch (sc->sc_density) { 484 case T_1600BPI: 485 s = 32 * 1024; 486 break; 487 488 case T_6250BPI: 489 case T_BADBPI: 490 s = 60 * 1024; 491 break; 492 } 493 } 494 if (bp->b_bcount > s) { 495 tprintf(sc->sc_ttyp, 496 "%s: write record (%ld) too big: limit (%d)\n", 497 sc->sc_dev.dv_xname, bp->b_bcount, s); 498 #if 0 /* XXX see above */ 499 error: 500 #endif 501 bp->b_flags |= B_ERROR; 502 bp->b_error = EIO; 503 biodone(bp); 504 return; 505 } 506 } 507 s = splbio(); 508 BUFQ_INSERT_TAIL(&sc->sc_tab, bp); 509 if (sc->sc_active == 0) { 510 sc->sc_active = 1; 511 mtustart(sc); 512 } 513 splx(s); 514 } 515 516 void 517 mtustart(sc) 518 struct mt_softc *sc; 519 { 520 521 dlog(LOG_DEBUG, "%s ustart", sc->sc_dev.dv_xname); 522 if (hpibreq(sc->sc_dev.dv_parent, &sc->sc_hq)) 523 mtstart(sc); 524 } 525 526 void 527 spl_mtintr(arg) 528 void *arg; 529 { 530 struct mt_softc *sc = arg; 531 int s = splbio(); 532 533 hpibppclear(sc->sc_hpibno); 534 mtintr(sc); 535 (void) splx(s); 536 } 537 538 void 539 spl_mtstart(arg) 540 void *arg; 541 { 542 int s = splbio(); 543 544 mtstart(arg); 545 (void) splx(s); 546 } 547 548 void 549 mtstart(arg) 550 void *arg; 551 { 552 struct mt_softc *sc = arg; 553 struct buf *bp, *dp; 554 short cmdcount = 1; 555 u_char cmdbuf[2]; 556 557 dlog(LOG_DEBUG, "%s start", sc->sc_dev.dv_xname); 558 sc->sc_flags &= ~MTF_WRT; 559 bp = BUFQ_FIRST(&sc->sc_tab); 560 if ((sc->sc_flags & MTF_ALIVE) == 0 && 561 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 562 goto fatalerror; 563 564 if (sc->sc_flags & MTF_REW) { 565 if (!hpibpptest(sc->sc_hpibno, sc->sc_slave)) 566 goto stillrew; 567 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 568 case 0: 569 case 1: 570 stillrew: 571 if ((sc->sc_stat1 & SR1_BOT) || 572 !(sc->sc_stat1 & SR1_ONLINE)) { 573 sc->sc_flags &= ~MTF_REW; 574 break; 575 } 576 case -2: 577 /* 578 * -2 means "timeout" reading DSJ, which is probably 579 * temporary. This is considered OK when doing a NOP, 580 * but not otherwise. 581 */ 582 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 583 timeout(spl_mtstart, sc, hz >> 5); 584 return; 585 } 586 case 2: 587 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 588 bp->b_error = EBUSY; 589 goto errdone; 590 } 591 goto done; 592 593 default: 594 goto fatalerror; 595 } 596 } 597 if (bp->b_flags & B_CMD) { 598 if (sc->sc_flags & MTF_PASTEOT) { 599 switch(bp->b_cmd) { 600 case MTFSF: 601 case MTWEOF: 602 case MTFSR: 603 bp->b_error = ENOSPC; 604 goto errdone; 605 606 case MTBSF: 607 case MTOFFL: 608 case MTBSR: 609 case MTREW: 610 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 611 break; 612 } 613 } 614 switch(bp->b_cmd) { 615 case MTFSF: 616 if (sc->sc_flags & MTF_HITEOF) 617 goto done; 618 cmdbuf[0] = MTTC_FSF; 619 break; 620 621 case MTBSF: 622 if (sc->sc_flags & MTF_HITBOF) 623 goto done; 624 cmdbuf[0] = MTTC_BSF; 625 break; 626 627 case MTOFFL: 628 sc->sc_flags |= MTF_REW; 629 cmdbuf[0] = MTTC_REWOFF; 630 break; 631 632 case MTWEOF: 633 cmdbuf[0] = MTTC_WFM; 634 break; 635 636 case MTBSR: 637 cmdbuf[0] = MTTC_BSR; 638 break; 639 640 case MTFSR: 641 cmdbuf[0] = MTTC_FSR; 642 break; 643 644 case MTREW: 645 sc->sc_flags |= MTF_REW; 646 cmdbuf[0] = MTTC_REW; 647 break; 648 649 case MTNOP: 650 /* 651 * NOP is supposed to set status bits. 652 * Force readdsj to do it. 653 */ 654 switch (mtreaddsj(sc, 655 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 656 default: 657 goto done; 658 659 case -1: 660 /* 661 * If this fails, perform a device clear 662 * to fix any protocol problems and (most 663 * likely) get the status. 664 */ 665 bp->b_cmd = MTRESET; 666 break; 667 668 case -2: 669 timeout(spl_mtstart, sc, hz >> 5); 670 return; 671 } 672 673 case MTRESET: 674 /* 675 * 1) selected device clear (send with "-2" secondary) 676 * 2) set timeout, then wait for "service request" 677 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 678 */ 679 if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){ 680 log(LOG_ERR, "%s can't reset", 681 sc->sc_dev.dv_xname); 682 goto fatalerror; 683 } 684 timeout(spl_mtintr, sc, 4 * hz); 685 hpibawait(sc->sc_hpibno); 686 return; 687 688 case MTSET800BPI: 689 cmdbuf[0] = MTTC_800; 690 break; 691 692 case MTSET1600BPI: 693 cmdbuf[0] = MTTC_1600; 694 break; 695 696 case MTSET6250BPI: 697 cmdbuf[0] = MTTC_6250; 698 break; 699 700 case MTSET6250DC: 701 cmdbuf[0] = MTTC_DC6250; 702 break; 703 } 704 } else { 705 if (sc->sc_flags & MTF_PASTEOT) { 706 bp->b_error = ENOSPC; 707 goto errdone; 708 } 709 if (bp->b_flags & B_READ) { 710 sc->sc_flags |= MTF_IO; 711 cmdbuf[0] = MTTC_READ; 712 } else { 713 sc->sc_flags |= MTF_WRT | MTF_IO; 714 cmdbuf[0] = MTTC_WRITE; 715 cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 716 cmdcount = 2; 717 } 718 } 719 if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 720 == cmdcount) { 721 if (sc->sc_flags & MTF_REW) 722 goto done; 723 hpibawait(sc->sc_hpibno); 724 return; 725 } 726 fatalerror: 727 /* 728 * If anything fails, the drive is probably hosed, so mark it not 729 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 730 * if, last we heard, it was REWinding, remember that). 731 */ 732 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 733 bp->b_error = EIO; 734 errdone: 735 bp->b_flags |= B_ERROR; 736 done: 737 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 738 BUFQ_REMOVE(&sc->sc_tab, bp); 739 biodone(bp); 740 hpibfree(sc->sc_dev.dv_parent, &sc->sc_hq); 741 if ((bp = BUFQ_FIRST(&sc->sc_tab)) == NULL) 742 sc->sc_active = 0; 743 else 744 mtustart(sc); 745 } 746 747 /* 748 * The Utah code had a bug which meant that the driver was unable to read. 749 * "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized. 750 * -- ajv (at) comp.vuw.ac.nz 751 */ 752 void 753 mtgo(arg) 754 void *arg; 755 { 756 struct mt_softc *sc = arg; 757 struct buf *bp; 758 int rw; 759 760 dlog(LOG_DEBUG, "%s go", sc->sc_dev.dv_xname); 761 bp = BUFQ_FIRST(&sc->sc_tab); 762 rw = bp->b_flags & B_READ; 763 hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE, 764 bp->b_un.b_addr, bp->b_bcount, rw, rw != 0); 765 } 766 767 void 768 mtintr(arg) 769 void *arg; 770 { 771 struct mt_softc *sc = arg; 772 struct buf *bp, *dp; 773 int i; 774 u_char cmdbuf[4]; 775 776 bp = BUFQ_FIRST(&sc->sc_tab); 777 if (bp == NULL) { 778 log(LOG_ERR, "%s intr: bp == NULL", sc->sc_dev.dv_xname); 779 return; 780 } 781 782 dlog(LOG_DEBUG, "%s intr", sc->sc_dev.dv_xname); 783 784 /* 785 * Some operation completed. Read status bytes and report errors. 786 * Clear EOF flags here `cause they're set once on specific conditions 787 * below when a command succeeds. 788 * A DSJ of 2 always means keep waiting. If the command was READ 789 * (and we're in data DMA phase) stop data transfer first. 790 */ 791 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 792 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 793 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 794 cmdbuf[0] = MTE_STOP; 795 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1); 796 } 797 switch (mtreaddsj(sc, 0)) { 798 case 0: 799 break; 800 801 case 1: 802 /* 803 * If we're in the middle of a READ/WRITE and have yet to 804 * start the data transfer, a DSJ of one should terminate it. 805 */ 806 sc->sc_flags &= ~MTF_IO; 807 break; 808 809 case 2: 810 (void) hpibawait(sc->sc_hpibno); 811 return; 812 813 case -2: 814 /* 815 * -2 means that the drive failed to respond quickly enough 816 * to the request for DSJ. It's probably just "busy" figuring 817 * it out and will know in a little bit... 818 */ 819 timeout(spl_mtintr, sc, hz >> 5); 820 return; 821 822 default: 823 log(LOG_ERR, "%s intr: can't get drive stat", 824 sc->sc_dev.dv_xname); 825 goto error; 826 } 827 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 828 i = sc->sc_stat4 & SR4_ERCLMASK; 829 log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d", 830 sc->sc_dev.dv_xname, i == SR4_DEVICE ? "device" : 831 (i == SR4_PROTOCOL ? "protocol" : 832 (i == SR4_SELFTEST ? "selftest" : "unknown")), 833 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 834 sc->sc_stat3, sc->sc_stat5); 835 836 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 837 untimeout(spl_mtintr, sc); 838 if (sc->sc_stat3 & SR3_POWERUP) 839 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 840 goto error; 841 } 842 /* 843 * Report and clear any soft errors. 844 */ 845 if (sc->sc_stat1 & SR1_SOFTERR) { 846 log(LOG_WARNING, "%s: soft error, retry %d\n", 847 sc->sc_dev.dv_xname, sc->sc_stat4 & SR4_RETRYMASK); 848 sc->sc_stat1 &= ~SR1_SOFTERR; 849 } 850 /* 851 * We've initiated a read or write, but haven't actually started to 852 * DMA the data yet. At this point, the drive's ready. 853 */ 854 if (sc->sc_flags & MTF_IO) { 855 sc->sc_flags &= ~MTF_IO; 856 if (hpibustart(sc->sc_hpibno)) 857 mtgo(sc); 858 return; 859 } 860 /* 861 * Check for End Of Tape - we're allowed to hit EOT and then write (or 862 * read) one more record. If we get here and have not already hit EOT, 863 * return ENOSPC to inform the process that it's hit it. If we get 864 * here and HAVE already hit EOT, don't allow any more operations that 865 * move the tape forward. 866 */ 867 if (sc->sc_stat1 & SR1_EOT) { 868 if (sc->sc_flags & MTF_ATEOT) 869 sc->sc_flags |= MTF_PASTEOT; 870 else { 871 bp->b_flags |= B_ERROR; 872 bp->b_error = ENOSPC; 873 sc->sc_flags |= MTF_ATEOT; 874 } 875 } 876 /* 877 * If a motion command was being executed, check for Tape Marks. 878 * If we were doing data, make sure we got the right amount, and 879 * check for hitting tape marks on reads. 880 */ 881 if (bp->b_flags & B_CMD) { 882 if (sc->sc_stat1 & SR1_EOF) { 883 if (bp->b_cmd == MTFSR) 884 sc->sc_flags |= MTF_HITEOF; 885 if (bp->b_cmd == MTBSR) 886 sc->sc_flags |= MTF_HITBOF; 887 } 888 if (bp->b_cmd == MTRESET) { 889 untimeout(spl_mtintr, sc); 890 sc->sc_flags |= MTF_ALIVE; 891 } 892 } else { 893 i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2); 894 if (i != 2) { 895 log(LOG_ERR, "%s intr: can't get xfer length\n", 896 sc->sc_dev.dv_xname); 897 goto error; 898 } 899 i = (int) *((u_short *) cmdbuf); 900 if (i <= bp->b_bcount) { 901 if (i == 0) 902 sc->sc_flags |= MTF_HITEOF; 903 bp->b_resid = bp->b_bcount - i; 904 dlog(LOG_DEBUG, "%s intr: bcount %ld, resid %ld", 905 sc->sc_dev.dv_xname, bp->b_bcount, bp->b_resid); 906 } else { 907 tprintf(sc->sc_ttyp, 908 "%s: record (%d) larger than wanted (%ld)\n", 909 sc->sc_dev.dv_xname, i, bp->b_bcount); 910 error: 911 sc->sc_flags &= ~MTF_IO; 912 bp->b_error = EIO; 913 bp->b_flags |= B_ERROR; 914 } 915 } 916 /* 917 * The operation is completely done. 918 * Let the drive know with an END command. 919 */ 920 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 921 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1); 922 bp->b_flags &= ~B_CMD; 923 BUFQ_REMOVE(&sc->sc_tab, bp); 924 biodone(bp); 925 hpibfree(sc->sc_dev.dv_parent, &sc->sc_hq); 926 if (BUFQ_FIRST(&sc->sc_tab) == NULL) 927 sc->sc_active = 0; 928 else 929 mtustart(sc); 930 } 931 932 int 933 mtread(dev, uio, flags) 934 dev_t dev; 935 struct uio *uio; 936 int flags; 937 { 938 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 939 940 return(physio(mtstrategy, &sc->sc_bufstore, 941 dev, B_READ, minphys, uio)); 942 } 943 944 int 945 mtwrite(dev, uio, flags) 946 dev_t dev; 947 struct uio *uio; 948 int flags; 949 { 950 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 951 952 return(physio(mtstrategy, &sc->sc_bufstore, 953 dev, B_WRITE, minphys, uio)); 954 } 955 956 int 957 mtioctl(dev, cmd, data, flag, p) 958 dev_t dev; 959 u_long cmd; 960 caddr_t data; 961 int flag; 962 struct proc *p; 963 { 964 struct mtop *op; 965 int cnt; 966 967 switch (cmd) { 968 case MTIOCTOP: 969 op = (struct mtop *)data; 970 switch(op->mt_op) { 971 case MTWEOF: 972 case MTFSF: 973 case MTBSR: 974 case MTBSF: 975 case MTFSR: 976 cnt = op->mt_count; 977 break; 978 979 case MTOFFL: 980 case MTREW: 981 case MTNOP: 982 cnt = 0; 983 break; 984 985 default: 986 return (EINVAL); 987 } 988 return (mtcommand(dev, op->mt_op, cnt)); 989 990 case MTIOCGET: 991 break; 992 993 default: 994 return (EINVAL); 995 } 996 return (0); 997 } 998 999 /*ARGSUSED*/ 1000 int 1001 mtdump(dev, blkno, va, size) 1002 dev_t dev; 1003 daddr_t blkno; 1004 caddr_t va; 1005 size_t size; 1006 { 1007 return (ENODEV); 1008 } 1009
Indexes created Wed Sep 24 14:09:57 GMT 2025