mt.c revision 1.23
1 /* $NetBSD: mt.c,v 1.23 2003/06/29 22:28:18 fvdl 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/cdefs.h> 70 __KERNEL_RCSID(0, "$NetBSD: mt.c,v 1.23 2003/06/29 22:28:18 fvdl Exp $"); 71 72 #include <sys/param.h> 73 #include <sys/systm.h> 74 #include <sys/callout.h> 75 #include <sys/buf.h> 76 #include <sys/ioctl.h> 77 #include <sys/mtio.h> 78 #include <sys/file.h> 79 #include <sys/proc.h> 80 #include <sys/errno.h> 81 #include <sys/syslog.h> 82 #include <sys/tty.h> 83 #include <sys/kernel.h> 84 #include <sys/tprintf.h> 85 #include <sys/device.h> 86 #include <sys/conf.h> 87 88 #include <hp300/dev/hpibvar.h> 89 90 #include <hp300/dev/mtreg.h> 91 92 struct mtinfo { 93 u_short hwid; 94 char *desc; 95 } mtinfo[] = { 96 { MT7978ID, "7978" }, 97 { MT7979AID, "7979A" }, 98 { MT7980ID, "7980" }, 99 { MT7974AID, "7974A" }, 100 }; 101 int nmtinfo = sizeof(mtinfo) / sizeof(mtinfo[0]); 102 103 struct mt_softc { 104 struct device sc_dev; 105 struct callout sc_start_ch; 106 struct callout sc_intr_ch; 107 int sc_hpibno; /* logical HPIB this slave it attached to */ 108 int sc_slave; /* HPIB slave address (0-6) */ 109 short sc_flags; /* see below */ 110 u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */ 111 u_char sc_lastecmd; /* place for End Command in mtreaddsj() */ 112 short sc_recvtimeo; /* count of hpibsend timeouts to prevent hang */ 113 short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */ 114 struct mt_stat sc_stat;/* status bytes last read from device */ 115 short sc_density; /* current density of tape (mtio.h format) */ 116 short sc_type; /* tape drive model (hardware IDs) */ 117 struct hpibqueue sc_hq; /* HPIB device queue member */ 118 tpr_t sc_ttyp; 119 struct bufq_state sc_tab;/* buf queue */ 120 int sc_active; 121 struct buf sc_bufstore; /* XXX buffer storage */ 122 }; 123 124 #ifdef DEBUG 125 int mtdebug = 0; 126 #define dlog if (mtdebug) log 127 #else 128 #define dlog if (0) log 129 #endif 130 131 #define UNIT(x) (minor(x) & 3) 132 133 #define B_CMD B_XXX /* command buf instead of data */ 134 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */ 135 136 int mtmatch __P((struct device *, struct cfdata *, void *)); 137 void mtattach __P((struct device *, struct device *, void *)); 138 139 CFATTACH_DECL(mt, sizeof(struct mt_softc), 140 mtmatch, mtattach, NULL, NULL); 141 142 extern struct cfdriver mt_cd; 143 144 dev_type_open(mtopen); 145 dev_type_close(mtclose); 146 dev_type_read(mtread); 147 dev_type_write(mtwrite); 148 dev_type_ioctl(mtioctl); 149 dev_type_strategy(mtstrategy); 150 151 const struct bdevsw mt_bdevsw = { 152 mtopen, mtclose, mtstrategy, mtioctl, nodump, nosize, D_TAPE 153 }; 154 155 const struct cdevsw mt_cdevsw = { 156 mtopen, mtclose, mtread, mtwrite, mtioctl, 157 nostop, notty, nopoll, nommap, nokqfilter, D_TAPE 158 }; 159 160 int mtident __P((struct mt_softc *, struct hpibbus_attach_args *)); 161 void mtustart __P((struct mt_softc *)); 162 int mtreaddsj __P((struct mt_softc *, int)); 163 int mtcommand __P((dev_t, int, int)); 164 void spl_mtintr __P((void *)); 165 void spl_mtstart __P((void *)); 166 167 void mtstart __P((void *)); 168 void mtgo __P((void *)); 169 void mtintr __P((void *)); 170 171 int 172 mtmatch(parent, match, aux) 173 struct device *parent; 174 struct cfdata *match; 175 void *aux; 176 { 177 struct hpibbus_attach_args *ha = aux; 178 179 return (mtident(NULL, ha)); 180 } 181 182 void 183 mtattach(parent, self, aux) 184 struct device *parent, *self; 185 void *aux; 186 { 187 struct mt_softc *sc = (struct mt_softc *)self; 188 struct hpibbus_attach_args *ha = aux; 189 int unit, hpibno, slave; 190 191 if (mtident(sc, ha) == 0) { 192 printf("\n%s: impossible!\n", sc->sc_dev.dv_xname); 193 return; 194 } 195 196 unit = self->dv_unit; 197 hpibno = parent->dv_unit; 198 slave = ha->ha_slave; 199 200 bufq_alloc(&sc->sc_tab, BUFQ_FCFS); 201 callout_init(&sc->sc_start_ch); 202 callout_init(&sc->sc_intr_ch); 203 204 sc->sc_hpibno = hpibno; 205 sc->sc_slave = slave; 206 sc->sc_flags = MTF_EXISTS; 207 208 /* Initialize hpib job queue entry. */ 209 sc->sc_hq.hq_softc = sc; 210 sc->sc_hq.hq_slave = sc->sc_slave; 211 sc->sc_hq.hq_start = mtstart; 212 sc->sc_hq.hq_go = mtgo; 213 sc->sc_hq.hq_intr = mtintr; 214 } 215 216 int 217 mtident(sc, ha) 218 struct mt_softc *sc; 219 struct hpibbus_attach_args *ha; 220 { 221 int i; 222 223 for (i = 0; i < nmtinfo; i++) { 224 if (ha->ha_id == mtinfo[i].hwid) { 225 if (sc != NULL) { 226 sc->sc_type = mtinfo[i].hwid; 227 printf(": %s tape\n", mtinfo[i].desc); 228 } 229 return (1); 230 } 231 } 232 return (0); 233 } 234 235 /* 236 * Perform a read of "Device Status Jump" register and update the 237 * status if necessary. If status is read, the given "ecmd" is also 238 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 239 * and -2 on "temporary" failure. 240 */ 241 int 242 mtreaddsj(sc, ecmd) 243 struct mt_softc *sc; 244 int ecmd; 245 { 246 int retval; 247 248 if (sc->sc_flags & MTF_STATTIMEO) 249 goto getstats; 250 retval = hpibrecv(sc->sc_hpibno, 251 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 252 MTT_DSJ, &(sc->sc_lastdsj), 1); 253 sc->sc_flags &= ~MTF_DSJTIMEO; 254 if (retval != 1) { 255 dlog(LOG_DEBUG, "%s can't hpibrecv DSJ", 256 sc->sc_dev.dv_xname); 257 if (sc->sc_recvtimeo == 0) 258 sc->sc_recvtimeo = hz; 259 if (--sc->sc_recvtimeo == 0) 260 return (-1); 261 if (retval == 0) 262 sc->sc_flags |= MTF_DSJTIMEO; 263 return (-2); 264 } 265 sc->sc_recvtimeo = 0; 266 sc->sc_statindex = 0; 267 dlog(LOG_DEBUG, "%s readdsj: 0x%x", sc->sc_dev.dv_xname, 268 sc->sc_lastdsj); 269 sc->sc_lastecmd = ecmd; 270 switch (sc->sc_lastdsj) { 271 case 0: 272 if (ecmd & MTE_DSJ_FORCE) 273 break; 274 return (0); 275 276 case 2: 277 sc->sc_lastecmd = MTE_COMPLETE; 278 case 1: 279 break; 280 281 default: 282 log(LOG_ERR, "%s readdsj: DSJ 0x%x\n", sc->sc_dev.dv_xname, 283 sc->sc_lastdsj); 284 return (-1); 285 } 286 getstats: 287 retval = hpibrecv(sc->sc_hpibno, 288 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, 289 MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex, 290 sizeof(sc->sc_stat) - sc->sc_statindex); 291 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 292 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 293 if (sc->sc_recvtimeo == 0) 294 sc->sc_recvtimeo = hz; 295 if (--sc->sc_recvtimeo != 0) { 296 if (retval >= 0) { 297 sc->sc_statindex += retval; 298 sc->sc_flags |= MTF_STATCONT; 299 } 300 sc->sc_flags |= MTF_STATTIMEO; 301 return (-2); 302 } 303 log(LOG_ERR, "%s readdsj: can't read status", 304 sc->sc_dev.dv_xname); 305 return (-1); 306 } 307 sc->sc_recvtimeo = 0; 308 sc->sc_statindex = 0; 309 dlog(LOG_DEBUG, "%s readdsj: status is %x %x %x %x %x %x", 310 sc->sc_dev.dv_xname, 311 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 312 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6); 313 if (sc->sc_lastecmd) 314 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, 315 MTL_ECMD, &(sc->sc_lastecmd), 1); 316 return ((int) sc->sc_lastdsj); 317 } 318 319 int 320 mtopen(dev, flag, mode, p) 321 dev_t dev; 322 int flag, mode; 323 struct proc *p; 324 { 325 int unit = UNIT(dev); 326 struct mt_softc *sc; 327 int req_den; 328 int error; 329 330 if (unit >= mt_cd.cd_ndevs || 331 (sc = mt_cd.cd_devs[unit]) == NULL || 332 (sc->sc_flags & MTF_EXISTS) == 0) 333 return (ENXIO); 334 335 dlog(LOG_DEBUG, "%s open: flags 0x%x", sc->sc_dev.dv_xname, 336 sc->sc_flags); 337 if (sc->sc_flags & MTF_OPEN) 338 return (EBUSY); 339 sc->sc_flags |= MTF_OPEN; 340 sc->sc_ttyp = tprintf_open(p); 341 if ((sc->sc_flags & MTF_ALIVE) == 0) { 342 error = mtcommand(dev, MTRESET, 0); 343 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 344 goto errout; 345 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 346 (void) mtcommand(dev, MTREW, 0); 347 } 348 for (;;) { 349 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 350 goto errout; 351 if (!(sc->sc_flags & MTF_REW)) 352 break; 353 if (tsleep((caddr_t) &lbolt, PCATCH | (PZERO + 1), 354 "mt", 0) != 0) { 355 error = EINTR; 356 goto errout; 357 } 358 } 359 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 360 error = EROFS; 361 goto errout; 362 } 363 if (!(sc->sc_stat1 & SR1_ONLINE)) { 364 uprintf("%s: not online\n", sc->sc_dev.dv_xname); 365 error = EIO; 366 goto errout; 367 } 368 /* 369 * Select density: 370 * - find out what density the drive is set to 371 * (i.e. the density of the current tape) 372 * - if we are going to write 373 * - if we're not at the beginning of the tape 374 * - complain if we want to change densities 375 * - otherwise, select the mtcommand to set the density 376 * 377 * If the drive doesn't support it then don't change the recorded 378 * density. 379 * 380 * The original MOREbsd code had these additional conditions 381 * for the mid-tape change 382 * 383 * req_den != T_BADBPI && 384 * sc->sc_density != T_6250BPI 385 * 386 * which suggests that it would be possible to write multiple 387 * densities if req_den == T_BAD_BPI or the current tape 388 * density was 6250. Testing of our 7980 suggests that the 389 * device cannot change densities mid-tape. 390 * 391 * ajv (at) comp.vuw.ac.nz 392 */ 393 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 394 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 395 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 396 req_den = (dev & T_DENSEL); 397 398 if (flag & FWRITE) { 399 if (!(sc->sc_stat1 & SR1_BOT)) { 400 if (sc->sc_density != req_den) { 401 uprintf("%s: can't change density mid-tape\n", 402 sc->sc_dev.dv_xname); 403 error = EIO; 404 goto errout; 405 } 406 } 407 else { 408 int mtset_density = 409 (req_den == T_800BPI ? MTSET800BPI : ( 410 req_den == T_1600BPI ? MTSET1600BPI : ( 411 req_den == T_6250BPI ? MTSET6250BPI : ( 412 sc->sc_type == MT7980ID 413 ? MTSET6250DC 414 : MTSET6250BPI)))); 415 if (mtcommand(dev, mtset_density, 0) == 0) 416 sc->sc_density = req_den; 417 } 418 } 419 return (0); 420 errout: 421 sc->sc_flags &= ~MTF_OPEN; 422 return (error); 423 } 424 425 int 426 mtclose(dev, flag, fmt, p) 427 dev_t dev; 428 int flag, fmt; 429 struct proc *p; 430 { 431 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 432 433 if (sc->sc_flags & MTF_WRT) { 434 (void) mtcommand(dev, MTWEOF, 2); 435 (void) mtcommand(dev, MTBSF, 0); 436 } 437 if ((minor(dev) & T_NOREWIND) == 0) 438 (void) mtcommand(dev, MTREW, 0); 439 sc->sc_flags &= ~MTF_OPEN; 440 tprintf_close(sc->sc_ttyp); 441 return (0); 442 } 443 444 int 445 mtcommand(dev, cmd, cnt) 446 dev_t dev; 447 int cmd; 448 int cnt; 449 { 450 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 451 struct buf *bp = &sc->sc_bufstore; 452 int error = 0; 453 454 #if 1 455 if (bp->b_flags & B_BUSY) 456 return (EBUSY); 457 #endif 458 bp->b_cmd = cmd; 459 bp->b_dev = dev; 460 do { 461 bp->b_flags = B_BUSY | B_CMD; 462 mtstrategy(bp); 463 biowait(bp); 464 if (bp->b_flags & B_ERROR) { 465 error = (int) (unsigned) bp->b_error; 466 break; 467 } 468 } while (--cnt > 0); 469 #if 0 470 bp->b_flags = 0 /*&= ~B_BUSY*/; 471 #else 472 bp->b_flags &= ~B_BUSY; 473 #endif 474 return (error); 475 } 476 477 /* 478 * Only thing to check here is for legal record lengths (writes only). 479 */ 480 void 481 mtstrategy(bp) 482 struct buf *bp; 483 { 484 struct mt_softc *sc; 485 int unit; 486 int s; 487 488 unit = UNIT(bp->b_dev); 489 sc = mt_cd.cd_devs[unit]; 490 dlog(LOG_DEBUG, "%s strategy", sc->sc_dev.dv_xname); 491 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 492 #define WRITE_BITS_IGNORED 8 493 #if 0 494 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 495 tprintf(sc->sc_ttyp, 496 "%s: write record must be multiple of %d\n", 497 sc->sc_dev.dv_xname, 1 << WRITE_BITS_IGNORED); 498 goto error; 499 } 500 #endif 501 s = 16 * 1024; 502 if (sc->sc_stat2 & SR2_LONGREC) { 503 switch (sc->sc_density) { 504 case T_1600BPI: 505 s = 32 * 1024; 506 break; 507 508 case T_6250BPI: 509 case T_BADBPI: 510 s = 60 * 1024; 511 break; 512 } 513 } 514 if (bp->b_bcount > s) { 515 tprintf(sc->sc_ttyp, 516 "%s: write record (%ld) too big: limit (%d)\n", 517 sc->sc_dev.dv_xname, bp->b_bcount, s); 518 #if 0 /* XXX see above */ 519 error: 520 #endif 521 bp->b_flags |= B_ERROR; 522 bp->b_error = EIO; 523 biodone(bp); 524 return; 525 } 526 } 527 s = splbio(); 528 BUFQ_PUT(&sc->sc_tab, bp); 529 if (sc->sc_active == 0) { 530 sc->sc_active = 1; 531 mtustart(sc); 532 } 533 splx(s); 534 } 535 536 void 537 mtustart(sc) 538 struct mt_softc *sc; 539 { 540 541 dlog(LOG_DEBUG, "%s ustart", sc->sc_dev.dv_xname); 542 if (hpibreq(sc->sc_dev.dv_parent, &sc->sc_hq)) 543 mtstart(sc); 544 } 545 546 void 547 spl_mtintr(arg) 548 void *arg; 549 { 550 struct mt_softc *sc = arg; 551 int s = splbio(); 552 553 hpibppclear(sc->sc_hpibno); 554 mtintr(sc); 555 splx(s); 556 } 557 558 void 559 spl_mtstart(arg) 560 void *arg; 561 { 562 int s = splbio(); 563 564 mtstart(arg); 565 splx(s); 566 } 567 568 void 569 mtstart(arg) 570 void *arg; 571 { 572 struct mt_softc *sc = arg; 573 struct buf *bp; 574 short cmdcount = 1; 575 u_char cmdbuf[2]; 576 577 dlog(LOG_DEBUG, "%s start", sc->sc_dev.dv_xname); 578 sc->sc_flags &= ~MTF_WRT; 579 bp = BUFQ_PEEK(&sc->sc_tab); 580 if ((sc->sc_flags & MTF_ALIVE) == 0 && 581 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 582 goto fatalerror; 583 584 if (sc->sc_flags & MTF_REW) { 585 if (!hpibpptest(sc->sc_hpibno, sc->sc_slave)) 586 goto stillrew; 587 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 588 case 0: 589 case 1: 590 stillrew: 591 if ((sc->sc_stat1 & SR1_BOT) || 592 !(sc->sc_stat1 & SR1_ONLINE)) { 593 sc->sc_flags &= ~MTF_REW; 594 break; 595 } 596 case -2: 597 /* 598 * -2 means "timeout" reading DSJ, which is probably 599 * temporary. This is considered OK when doing a NOP, 600 * but not otherwise. 601 */ 602 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 603 callout_reset(&sc->sc_start_ch, hz >> 5, 604 spl_mtstart, sc); 605 return; 606 } 607 case 2: 608 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 609 bp->b_error = EBUSY; 610 goto errdone; 611 } 612 goto done; 613 614 default: 615 goto fatalerror; 616 } 617 } 618 if (bp->b_flags & B_CMD) { 619 if (sc->sc_flags & MTF_PASTEOT) { 620 switch(bp->b_cmd) { 621 case MTFSF: 622 case MTWEOF: 623 case MTFSR: 624 bp->b_error = ENOSPC; 625 goto errdone; 626 627 case MTBSF: 628 case MTOFFL: 629 case MTBSR: 630 case MTREW: 631 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 632 break; 633 } 634 } 635 switch(bp->b_cmd) { 636 case MTFSF: 637 if (sc->sc_flags & MTF_HITEOF) 638 goto done; 639 cmdbuf[0] = MTTC_FSF; 640 break; 641 642 case MTBSF: 643 if (sc->sc_flags & MTF_HITBOF) 644 goto done; 645 cmdbuf[0] = MTTC_BSF; 646 break; 647 648 case MTOFFL: 649 sc->sc_flags |= MTF_REW; 650 cmdbuf[0] = MTTC_REWOFF; 651 break; 652 653 case MTWEOF: 654 cmdbuf[0] = MTTC_WFM; 655 break; 656 657 case MTBSR: 658 cmdbuf[0] = MTTC_BSR; 659 break; 660 661 case MTFSR: 662 cmdbuf[0] = MTTC_FSR; 663 break; 664 665 case MTREW: 666 sc->sc_flags |= MTF_REW; 667 cmdbuf[0] = MTTC_REW; 668 break; 669 670 case MTNOP: 671 /* 672 * NOP is supposed to set status bits. 673 * Force readdsj to do it. 674 */ 675 switch (mtreaddsj(sc, 676 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 677 default: 678 goto done; 679 680 case -1: 681 /* 682 * If this fails, perform a device clear 683 * to fix any protocol problems and (most 684 * likely) get the status. 685 */ 686 bp->b_cmd = MTRESET; 687 break; 688 689 case -2: 690 callout_reset(&sc->sc_start_ch, hz >> 5, 691 spl_mtstart, sc); 692 return; 693 } 694 695 case MTRESET: 696 /* 697 * 1) selected device clear (send with "-2" secondary) 698 * 2) set timeout, then wait for "service request" 699 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 700 */ 701 if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){ 702 log(LOG_ERR, "%s can't reset", 703 sc->sc_dev.dv_xname); 704 goto fatalerror; 705 } 706 callout_reset(&sc->sc_intr_ch, 4 * hz, spl_mtintr, sc); 707 hpibawait(sc->sc_hpibno); 708 return; 709 710 case MTSET800BPI: 711 cmdbuf[0] = MTTC_800; 712 break; 713 714 case MTSET1600BPI: 715 cmdbuf[0] = MTTC_1600; 716 break; 717 718 case MTSET6250BPI: 719 cmdbuf[0] = MTTC_6250; 720 break; 721 722 case MTSET6250DC: 723 cmdbuf[0] = MTTC_DC6250; 724 break; 725 } 726 } else { 727 if (sc->sc_flags & MTF_PASTEOT) { 728 bp->b_error = ENOSPC; 729 goto errdone; 730 } 731 if (bp->b_flags & B_READ) { 732 sc->sc_flags |= MTF_IO; 733 cmdbuf[0] = MTTC_READ; 734 } else { 735 sc->sc_flags |= MTF_WRT | MTF_IO; 736 cmdbuf[0] = MTTC_WRITE; 737 cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 738 cmdcount = 2; 739 } 740 } 741 if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 742 == cmdcount) { 743 if (sc->sc_flags & MTF_REW) 744 goto done; 745 hpibawait(sc->sc_hpibno); 746 return; 747 } 748 fatalerror: 749 /* 750 * If anything fails, the drive is probably hosed, so mark it not 751 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 752 * if, last we heard, it was REWinding, remember that). 753 */ 754 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 755 bp->b_error = EIO; 756 errdone: 757 bp->b_flags |= B_ERROR; 758 done: 759 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 760 (void)BUFQ_GET(&sc->sc_tab); 761 biodone(bp); 762 hpibfree(sc->sc_dev.dv_parent, &sc->sc_hq); 763 if ((bp = BUFQ_PEEK(&sc->sc_tab)) == NULL) 764 sc->sc_active = 0; 765 else 766 mtustart(sc); 767 } 768 769 /* 770 * The Utah code had a bug which meant that the driver was unable to read. 771 * "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized. 772 * -- ajv (at) comp.vuw.ac.nz 773 */ 774 void 775 mtgo(arg) 776 void *arg; 777 { 778 struct mt_softc *sc = arg; 779 struct buf *bp; 780 int rw; 781 782 dlog(LOG_DEBUG, "%s go", sc->sc_dev.dv_xname); 783 bp = BUFQ_PEEK(&sc->sc_tab); 784 rw = bp->b_flags & B_READ; 785 hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE, 786 bp->b_data, bp->b_bcount, rw, rw != 0); 787 } 788 789 void 790 mtintr(arg) 791 void *arg; 792 { 793 struct mt_softc *sc = arg; 794 struct buf *bp; 795 int i; 796 u_char cmdbuf[4]; 797 798 bp = BUFQ_PEEK(&sc->sc_tab); 799 if (bp == NULL) { 800 log(LOG_ERR, "%s intr: bp == NULL", sc->sc_dev.dv_xname); 801 return; 802 } 803 804 dlog(LOG_DEBUG, "%s intr", sc->sc_dev.dv_xname); 805 806 /* 807 * Some operation completed. Read status bytes and report errors. 808 * Clear EOF flags here `cause they're set once on specific conditions 809 * below when a command succeeds. 810 * A DSJ of 2 always means keep waiting. If the command was READ 811 * (and we're in data DMA phase) stop data transfer first. 812 */ 813 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 814 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 815 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 816 cmdbuf[0] = MTE_STOP; 817 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1); 818 } 819 switch (mtreaddsj(sc, 0)) { 820 case 0: 821 break; 822 823 case 1: 824 /* 825 * If we're in the middle of a READ/WRITE and have yet to 826 * start the data transfer, a DSJ of one should terminate it. 827 */ 828 sc->sc_flags &= ~MTF_IO; 829 break; 830 831 case 2: 832 (void) hpibawait(sc->sc_hpibno); 833 return; 834 835 case -2: 836 /* 837 * -2 means that the drive failed to respond quickly enough 838 * to the request for DSJ. It's probably just "busy" figuring 839 * it out and will know in a little bit... 840 */ 841 callout_reset(&sc->sc_intr_ch, hz >> 5, spl_mtintr, sc); 842 return; 843 844 default: 845 log(LOG_ERR, "%s intr: can't get drive stat", 846 sc->sc_dev.dv_xname); 847 goto error; 848 } 849 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 850 i = sc->sc_stat4 & SR4_ERCLMASK; 851 log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d", 852 sc->sc_dev.dv_xname, i == SR4_DEVICE ? "device" : 853 (i == SR4_PROTOCOL ? "protocol" : 854 (i == SR4_SELFTEST ? "selftest" : "unknown")), 855 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 856 sc->sc_stat3, sc->sc_stat5); 857 858 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 859 callout_stop(&sc->sc_intr_ch); 860 if (sc->sc_stat3 & SR3_POWERUP) 861 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 862 goto error; 863 } 864 /* 865 * Report and clear any soft errors. 866 */ 867 if (sc->sc_stat1 & SR1_SOFTERR) { 868 log(LOG_WARNING, "%s: soft error, retry %d\n", 869 sc->sc_dev.dv_xname, sc->sc_stat4 & SR4_RETRYMASK); 870 sc->sc_stat1 &= ~SR1_SOFTERR; 871 } 872 /* 873 * We've initiated a read or write, but haven't actually started to 874 * DMA the data yet. At this point, the drive's ready. 875 */ 876 if (sc->sc_flags & MTF_IO) { 877 sc->sc_flags &= ~MTF_IO; 878 if (hpibustart(sc->sc_hpibno)) 879 mtgo(sc); 880 return; 881 } 882 /* 883 * Check for End Of Tape - we're allowed to hit EOT and then write (or 884 * read) one more record. If we get here and have not already hit EOT, 885 * return ENOSPC to inform the process that it's hit it. If we get 886 * here and HAVE already hit EOT, don't allow any more operations that 887 * move the tape forward. 888 */ 889 if (sc->sc_stat1 & SR1_EOT) { 890 if (sc->sc_flags & MTF_ATEOT) 891 sc->sc_flags |= MTF_PASTEOT; 892 else { 893 bp->b_flags |= B_ERROR; 894 bp->b_error = ENOSPC; 895 sc->sc_flags |= MTF_ATEOT; 896 } 897 } 898 /* 899 * If a motion command was being executed, check for Tape Marks. 900 * If we were doing data, make sure we got the right amount, and 901 * check for hitting tape marks on reads. 902 */ 903 if (bp->b_flags & B_CMD) { 904 if (sc->sc_stat1 & SR1_EOF) { 905 if (bp->b_cmd == MTFSR) 906 sc->sc_flags |= MTF_HITEOF; 907 if (bp->b_cmd == MTBSR) 908 sc->sc_flags |= MTF_HITBOF; 909 } 910 if (bp->b_cmd == MTRESET) { 911 callout_stop(&sc->sc_intr_ch); 912 sc->sc_flags |= MTF_ALIVE; 913 } 914 } else { 915 i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2); 916 if (i != 2) { 917 log(LOG_ERR, "%s intr: can't get xfer length\n", 918 sc->sc_dev.dv_xname); 919 goto error; 920 } 921 i = (int) *((u_short *) cmdbuf); 922 if (i <= bp->b_bcount) { 923 if (i == 0) 924 sc->sc_flags |= MTF_HITEOF; 925 bp->b_resid = bp->b_bcount - i; 926 dlog(LOG_DEBUG, "%s intr: bcount %ld, resid %ld", 927 sc->sc_dev.dv_xname, bp->b_bcount, bp->b_resid); 928 } else { 929 tprintf(sc->sc_ttyp, 930 "%s: record (%d) larger than wanted (%ld)\n", 931 sc->sc_dev.dv_xname, i, bp->b_bcount); 932 error: 933 sc->sc_flags &= ~MTF_IO; 934 bp->b_error = EIO; 935 bp->b_flags |= B_ERROR; 936 } 937 } 938 /* 939 * The operation is completely done. 940 * Let the drive know with an END command. 941 */ 942 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 943 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1); 944 bp->b_flags &= ~B_CMD; 945 (void)BUFQ_GET(&sc->sc_tab); 946 biodone(bp); 947 hpibfree(sc->sc_dev.dv_parent, &sc->sc_hq); 948 if (BUFQ_PEEK(&sc->sc_tab) == NULL) 949 sc->sc_active = 0; 950 else 951 mtustart(sc); 952 } 953 954 int 955 mtread(dev, uio, flags) 956 dev_t dev; 957 struct uio *uio; 958 int flags; 959 { 960 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 961 962 return(physio(mtstrategy, &sc->sc_bufstore, 963 dev, B_READ, minphys, uio)); 964 } 965 966 int 967 mtwrite(dev, uio, flags) 968 dev_t dev; 969 struct uio *uio; 970 int flags; 971 { 972 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 973 974 return(physio(mtstrategy, &sc->sc_bufstore, 975 dev, B_WRITE, minphys, uio)); 976 } 977 978 int 979 mtioctl(dev, cmd, data, flag, p) 980 dev_t dev; 981 u_long cmd; 982 caddr_t data; 983 int flag; 984 struct proc *p; 985 { 986 struct mtop *op; 987 int cnt; 988 989 switch (cmd) { 990 case MTIOCTOP: 991 op = (struct mtop *)data; 992 switch(op->mt_op) { 993 case MTWEOF: 994 case MTFSF: 995 case MTBSR: 996 case MTBSF: 997 case MTFSR: 998 cnt = op->mt_count; 999 break; 1000 1001 case MTOFFL: 1002 case MTREW: 1003 case MTNOP: 1004 cnt = 0; 1005 break; 1006 1007 default: 1008 return (EINVAL); 1009 } 1010 return (mtcommand(dev, op->mt_op, cnt)); 1011 1012 case MTIOCGET: 1013 break; 1014 1015 default: 1016 return (EINVAL); 1017 } 1018 return (0); 1019 } 1020
Indexes created Wed Sep 24 05:09:52 GMT 2025