mt.c revision 1.14.6.1
1 /* $NetBSD: mt.c,v 1.14.6.1 2001/10/10 11:56:05 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/param.h> 70 #include <sys/systm.h> 71 #include <sys/callout.h> 72 #include <sys/buf.h> 73 #include <sys/ioctl.h> 74 #include <sys/mtio.h> 75 #include <sys/file.h> 76 #include <sys/proc.h> 77 #include <sys/errno.h> 78 #include <sys/syslog.h> 79 #include <sys/tty.h> 80 #include <sys/kernel.h> 81 #include <sys/tprintf.h> 82 #include <sys/device.h> 83 #include <sys/conf.h> 84 #include <sys/vnode.h> 85 86 #include <hp300/dev/hpibvar.h> 87 88 #include <hp300/dev/mtreg.h> 89 90 struct mtinfo { 91 u_short hwid; 92 char *desc; 93 } mtinfo[] = { 94 { MT7978ID, "7978" }, 95 { MT7979AID, "7979A" }, 96 { MT7980ID, "7980" }, 97 { MT7974AID, "7974A" }, 98 }; 99 int nmtinfo = sizeof(mtinfo) / sizeof(mtinfo[0]); 100 101 struct mt_softc { 102 struct device sc_dev; 103 struct callout sc_start_ch; 104 struct callout sc_intr_ch; 105 int sc_hpibno; /* logical HPIB this slave it attached to */ 106 int sc_slave; /* HPIB slave address (0-6) */ 107 short sc_flags; /* see below */ 108 u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */ 109 u_char sc_lastecmd; /* place for End Command in mtreaddsj() */ 110 short sc_recvtimeo; /* count of hpibsend timeouts to prevent hang */ 111 short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */ 112 struct mt_stat sc_stat;/* status bytes last read from device */ 113 short sc_density; /* current density of tape (mtio.h format) */ 114 short sc_type; /* tape drive model (hardware IDs) */ 115 struct hpibqueue sc_hq; /* HPIB device queue member */ 116 tpr_t sc_ttyp; 117 struct buf_queue sc_tab;/* buf queue */ 118 int sc_active; 119 struct buf sc_bufstore; /* XXX buffer storage */ 120 }; 121 122 #ifdef DEBUG 123 int mtdebug = 0; 124 #define dlog if (mtdebug) log 125 #else 126 #define dlog if (0) log 127 #endif 128 129 #define UNIT(x) (minor(x) & 3) 130 131 #define B_CMD B_XXX /* command buf instead of data */ 132 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */ 133 134 int mtmatch __P((struct device *, struct cfdata *, void *)); 135 void mtattach __P((struct device *, struct device *, void *)); 136 137 struct cfattach mt_ca = { 138 sizeof(struct mt_softc), mtmatch, mtattach 139 }; 140 141 extern struct cfdriver mt_cd; 142 143 int mtident __P((struct mt_softc *, struct hpibbus_attach_args *)); 144 void mtustart __P((struct mt_softc *)); 145 int mtreaddsj __P((struct mt_softc *, int)); 146 int mtcommand __P((struct vnode *, int, int)); 147 void spl_mtintr __P((void *)); 148 void spl_mtstart __P((void *)); 149 150 void mtstart __P((void *)); 151 void mtgo __P((void *)); 152 void mtintr __P((void *)); 153 154 bdev_decl(mt); 155 cdev_decl(mt); 156 157 int 158 mtmatch(parent, match, aux) 159 struct device *parent; 160 struct cfdata *match; 161 void *aux; 162 { 163 struct hpibbus_attach_args *ha = aux; 164 165 return (mtident(NULL, ha)); 166 } 167 168 void 169 mtattach(parent, self, aux) 170 struct device *parent, *self; 171 void *aux; 172 { 173 struct mt_softc *sc = (struct mt_softc *)self; 174 struct hpibbus_attach_args *ha = aux; 175 int unit, hpibno, slave; 176 177 if (mtident(sc, ha) == 0) { 178 printf("\n%s: impossible!\n", sc->sc_dev.dv_xname); 179 return; 180 } 181 182 unit = self->dv_unit; 183 hpibno = parent->dv_unit; 184 slave = ha->ha_slave; 185 186 BUFQ_INIT(&sc->sc_tab); 187 callout_init(&sc->sc_start_ch); 188 callout_init(&sc->sc_intr_ch); 189 190 sc->sc_hpibno = hpibno; 191 sc->sc_slave = slave; 192 sc->sc_flags = MTF_EXISTS; 193 194 /* Initialize hpib job queue entry. */ 195 sc->sc_hq.hq_softc = sc; 196 sc->sc_hq.hq_slave = sc->sc_slave; 197 sc->sc_hq.hq_start = mtstart; 198 sc->sc_hq.hq_go = mtgo; 199 sc->sc_hq.hq_intr = mtintr; 200 } 201 202 int 203 mtident(sc, ha) 204 struct mt_softc *sc; 205 struct hpibbus_attach_args *ha; 206 { 207 int i; 208 209 for (i = 0; i < nmtinfo; i++) { 210 if (ha->ha_id == mtinfo[i].hwid) { 211 if (sc != NULL) { 212 sc->sc_type = mtinfo[i].hwid; 213 printf(": %s tape\n", mtinfo[i].desc); 214 } 215 return (1); 216 } 217 } 218 return (0); 219 } 220 221 /* 222 * Perform a read of "Device Status Jump" register and update the 223 * status if necessary. If status is read, the given "ecmd" is also 224 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 225 * and -2 on "temporary" failure. 226 */ 227 int 228 mtreaddsj(sc, ecmd) 229 struct mt_softc *sc; 230 int ecmd; 231 { 232 int retval; 233 234 if (sc->sc_flags & MTF_STATTIMEO) 235 goto getstats; 236 retval = hpibrecv(sc->sc_hpibno, 237 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 238 MTT_DSJ, &(sc->sc_lastdsj), 1); 239 sc->sc_flags &= ~MTF_DSJTIMEO; 240 if (retval != 1) { 241 dlog(LOG_DEBUG, "%s can't hpibrecv DSJ", 242 sc->sc_dev.dv_xname); 243 if (sc->sc_recvtimeo == 0) 244 sc->sc_recvtimeo = hz; 245 if (--sc->sc_recvtimeo == 0) 246 return (-1); 247 if (retval == 0) 248 sc->sc_flags |= MTF_DSJTIMEO; 249 return (-2); 250 } 251 sc->sc_recvtimeo = 0; 252 sc->sc_statindex = 0; 253 dlog(LOG_DEBUG, "%s readdsj: 0x%x", sc->sc_dev.dv_xname, 254 sc->sc_lastdsj); 255 sc->sc_lastecmd = ecmd; 256 switch (sc->sc_lastdsj) { 257 case 0: 258 if (ecmd & MTE_DSJ_FORCE) 259 break; 260 return (0); 261 262 case 2: 263 sc->sc_lastecmd = MTE_COMPLETE; 264 case 1: 265 break; 266 267 default: 268 log(LOG_ERR, "%s readdsj: DSJ 0x%x\n", sc->sc_dev.dv_xname, 269 sc->sc_lastdsj); 270 return (-1); 271 } 272 getstats: 273 retval = hpibrecv(sc->sc_hpibno, 274 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, 275 MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex, 276 sizeof(sc->sc_stat) - sc->sc_statindex); 277 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 278 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 279 if (sc->sc_recvtimeo == 0) 280 sc->sc_recvtimeo = hz; 281 if (--sc->sc_recvtimeo != 0) { 282 if (retval >= 0) { 283 sc->sc_statindex += retval; 284 sc->sc_flags |= MTF_STATCONT; 285 } 286 sc->sc_flags |= MTF_STATTIMEO; 287 return (-2); 288 } 289 log(LOG_ERR, "%s readdsj: can't read status", 290 sc->sc_dev.dv_xname); 291 return (-1); 292 } 293 sc->sc_recvtimeo = 0; 294 sc->sc_statindex = 0; 295 dlog(LOG_DEBUG, "%s readdsj: status is %x %x %x %x %x %x", 296 sc->sc_dev.dv_xname, 297 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 298 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6); 299 if (sc->sc_lastecmd) 300 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, 301 MTL_ECMD, &(sc->sc_lastecmd), 1); 302 return ((int) sc->sc_lastdsj); 303 } 304 305 int 306 mtopen(devvp, flag, mode, p) 307 struct vnode *devvp; 308 int flag, mode; 309 struct proc *p; 310 { 311 dev_t dev = vdev_rdev(devvp); 312 int unit = UNIT(dev); 313 struct mt_softc *sc; 314 int req_den; 315 int error; 316 317 if (unit >= mt_cd.cd_ndevs || 318 (sc = mt_cd.cd_devs[unit]) == NULL || 319 (sc->sc_flags & MTF_EXISTS) == 0) 320 return (ENXIO); 321 322 dlog(LOG_DEBUG, "%s open: flags 0x%x", sc->sc_dev.dv_xname, 323 sc->sc_flags); 324 if (sc->sc_flags & MTF_OPEN) 325 return (EBUSY); 326 327 vdev_setprivdata(devvp, sc); 328 329 sc->sc_flags |= MTF_OPEN; 330 sc->sc_ttyp = tprintf_open(p); 331 if ((sc->sc_flags & MTF_ALIVE) == 0) { 332 error = mtcommand(devvp, MTRESET, 0); 333 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 334 goto errout; 335 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 336 (void) mtcommand(devvp, MTREW, 0); 337 } 338 for (;;) { 339 if ((error = mtcommand(devvp, MTNOP, 0)) != 0) 340 goto errout; 341 if (!(sc->sc_flags & MTF_REW)) 342 break; 343 if (tsleep((caddr_t) &lbolt, PCATCH | (PZERO + 1), 344 "mt", 0) != 0) { 345 error = EINTR; 346 goto errout; 347 } 348 } 349 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 350 error = EROFS; 351 goto errout; 352 } 353 if (!(sc->sc_stat1 & SR1_ONLINE)) { 354 uprintf("%s: not online\n", sc->sc_dev.dv_xname); 355 error = EIO; 356 goto errout; 357 } 358 /* 359 * Select density: 360 * - find out what density the drive is set to 361 * (i.e. the density of the current tape) 362 * - if we are going to write 363 * - if we're not at the beginning of the tape 364 * - complain if we want to change densities 365 * - otherwise, select the mtcommand to set the density 366 * 367 * If the drive doesn't support it then don't change the recorded 368 * density. 369 * 370 * The original MOREbsd code had these additional conditions 371 * for the mid-tape change 372 * 373 * req_den != T_BADBPI && 374 * sc->sc_density != T_6250BPI 375 * 376 * which suggests that it would be possible to write multiple 377 * densities if req_den == T_BAD_BPI or the current tape 378 * density was 6250. Testing of our 7980 suggests that the 379 * device cannot change densities mid-tape. 380 * 381 * ajv (at) comp.vuw.ac.nz 382 */ 383 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 384 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 385 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 386 req_den = (dev & T_DENSEL); 387 388 if (flag & FWRITE) { 389 if (!(sc->sc_stat1 & SR1_BOT)) { 390 if (sc->sc_density != req_den) { 391 uprintf("%s: can't change density mid-tape\n", 392 sc->sc_dev.dv_xname); 393 error = EIO; 394 goto errout; 395 } 396 } 397 else { 398 int mtset_density = 399 (req_den == T_800BPI ? MTSET800BPI : ( 400 req_den == T_1600BPI ? MTSET1600BPI : ( 401 req_den == T_6250BPI ? MTSET6250BPI : ( 402 sc->sc_type == MT7980ID 403 ? MTSET6250DC 404 : MTSET6250BPI)))); 405 if (mtcommand(devvp, mtset_density, 0) == 0) 406 sc->sc_density = req_den; 407 } 408 } 409 return (0); 410 errout: 411 sc->sc_flags &= ~MTF_OPEN; 412 return (error); 413 } 414 415 int 416 mtclose(devvp, flag, fmt, p) 417 struct vnode *devvp; 418 int flag, fmt; 419 struct proc *p; 420 { 421 struct mt_softc *sc; 422 423 sc = vdev_privdata(devvp); 424 425 if (sc->sc_flags & MTF_WRT) { 426 (void) mtcommand(devvp, MTWEOF, 2); 427 (void) mtcommand(devvp, MTBSF, 0); 428 } 429 if ((minor(vdev_rdev(devvp)) & T_NOREWIND) == 0) 430 (void) mtcommand(devvp, MTREW, 0); 431 sc->sc_flags &= ~MTF_OPEN; 432 tprintf_close(sc->sc_ttyp); 433 return (0); 434 } 435 436 int 437 mtcommand(devvp, cmd, cnt) 438 struct vnode *devvp; 439 int cmd; 440 int cnt; 441 { 442 struct mt_softc *sc = vdev_privdata(devvp); 443 struct buf *bp = &sc->sc_bufstore; 444 int error = 0; 445 446 #if 1 447 if (bp->b_flags & B_BUSY) 448 return (EBUSY); 449 #endif 450 bp->b_cmd = cmd; 451 bp->b_devvp = devvp; 452 do { 453 bp->b_flags = B_BUSY | B_CMD; 454 mtstrategy(bp); 455 biowait(bp); 456 if (bp->b_flags & B_ERROR) { 457 error = (int) (unsigned) bp->b_error; 458 break; 459 } 460 } while (--cnt > 0); 461 #if 0 462 bp->b_flags = 0 /*&= ~B_BUSY*/; 463 #else 464 bp->b_flags &= ~B_BUSY; 465 #endif 466 return (error); 467 } 468 469 /* 470 * Only thing to check here is for legal record lengths (writes only). 471 */ 472 void 473 mtstrategy(bp) 474 struct buf *bp; 475 { 476 struct mt_softc *sc; 477 int s; 478 479 sc = vdev_privdata(bp->b_devvp); 480 dlog(LOG_DEBUG, "%s strategy", sc->sc_dev.dv_xname); 481 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 482 #define WRITE_BITS_IGNORED 8 483 #if 0 484 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 485 tprintf(sc->sc_ttyp, 486 "%s: write record must be multiple of %d\n", 487 sc->sc_dev.dv_xname, 1 << WRITE_BITS_IGNORED); 488 goto error; 489 } 490 #endif 491 s = 16 * 1024; 492 if (sc->sc_stat2 & SR2_LONGREC) { 493 switch (sc->sc_density) { 494 case T_1600BPI: 495 s = 32 * 1024; 496 break; 497 498 case T_6250BPI: 499 case T_BADBPI: 500 s = 60 * 1024; 501 break; 502 } 503 } 504 if (bp->b_bcount > s) { 505 tprintf(sc->sc_ttyp, 506 "%s: write record (%ld) too big: limit (%d)\n", 507 sc->sc_dev.dv_xname, bp->b_bcount, s); 508 #if 0 /* XXX see above */ 509 error: 510 #endif 511 bp->b_flags |= B_ERROR; 512 bp->b_error = EIO; 513 biodone(bp); 514 return; 515 } 516 } 517 s = splbio(); 518 BUFQ_INSERT_TAIL(&sc->sc_tab, bp); 519 if (sc->sc_active == 0) { 520 sc->sc_active = 1; 521 mtustart(sc); 522 } 523 splx(s); 524 } 525 526 void 527 mtustart(sc) 528 struct mt_softc *sc; 529 { 530 531 dlog(LOG_DEBUG, "%s ustart", sc->sc_dev.dv_xname); 532 if (hpibreq(sc->sc_dev.dv_parent, &sc->sc_hq)) 533 mtstart(sc); 534 } 535 536 void 537 spl_mtintr(arg) 538 void *arg; 539 { 540 struct mt_softc *sc = arg; 541 int s = splbio(); 542 543 hpibppclear(sc->sc_hpibno); 544 mtintr(sc); 545 (void) splx(s); 546 } 547 548 void 549 spl_mtstart(arg) 550 void *arg; 551 { 552 int s = splbio(); 553 554 mtstart(arg); 555 (void) splx(s); 556 } 557 558 void 559 mtstart(arg) 560 void *arg; 561 { 562 struct mt_softc *sc = arg; 563 struct buf *bp; 564 short cmdcount = 1; 565 u_char cmdbuf[2]; 566 567 dlog(LOG_DEBUG, "%s start", sc->sc_dev.dv_xname); 568 sc->sc_flags &= ~MTF_WRT; 569 bp = BUFQ_FIRST(&sc->sc_tab); 570 if ((sc->sc_flags & MTF_ALIVE) == 0 && 571 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 572 goto fatalerror; 573 574 if (sc->sc_flags & MTF_REW) { 575 if (!hpibpptest(sc->sc_hpibno, sc->sc_slave)) 576 goto stillrew; 577 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 578 case 0: 579 case 1: 580 stillrew: 581 if ((sc->sc_stat1 & SR1_BOT) || 582 !(sc->sc_stat1 & SR1_ONLINE)) { 583 sc->sc_flags &= ~MTF_REW; 584 break; 585 } 586 case -2: 587 /* 588 * -2 means "timeout" reading DSJ, which is probably 589 * temporary. This is considered OK when doing a NOP, 590 * but not otherwise. 591 */ 592 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 593 callout_reset(&sc->sc_start_ch, hz >> 5, 594 spl_mtstart, sc); 595 return; 596 } 597 case 2: 598 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 599 bp->b_error = EBUSY; 600 goto errdone; 601 } 602 goto done; 603 604 default: 605 goto fatalerror; 606 } 607 } 608 if (bp->b_flags & B_CMD) { 609 if (sc->sc_flags & MTF_PASTEOT) { 610 switch(bp->b_cmd) { 611 case MTFSF: 612 case MTWEOF: 613 case MTFSR: 614 bp->b_error = ENOSPC; 615 goto errdone; 616 617 case MTBSF: 618 case MTOFFL: 619 case MTBSR: 620 case MTREW: 621 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 622 break; 623 } 624 } 625 switch(bp->b_cmd) { 626 case MTFSF: 627 if (sc->sc_flags & MTF_HITEOF) 628 goto done; 629 cmdbuf[0] = MTTC_FSF; 630 break; 631 632 case MTBSF: 633 if (sc->sc_flags & MTF_HITBOF) 634 goto done; 635 cmdbuf[0] = MTTC_BSF; 636 break; 637 638 case MTOFFL: 639 sc->sc_flags |= MTF_REW; 640 cmdbuf[0] = MTTC_REWOFF; 641 break; 642 643 case MTWEOF: 644 cmdbuf[0] = MTTC_WFM; 645 break; 646 647 case MTBSR: 648 cmdbuf[0] = MTTC_BSR; 649 break; 650 651 case MTFSR: 652 cmdbuf[0] = MTTC_FSR; 653 break; 654 655 case MTREW: 656 sc->sc_flags |= MTF_REW; 657 cmdbuf[0] = MTTC_REW; 658 break; 659 660 case MTNOP: 661 /* 662 * NOP is supposed to set status bits. 663 * Force readdsj to do it. 664 */ 665 switch (mtreaddsj(sc, 666 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 667 default: 668 goto done; 669 670 case -1: 671 /* 672 * If this fails, perform a device clear 673 * to fix any protocol problems and (most 674 * likely) get the status. 675 */ 676 bp->b_cmd = MTRESET; 677 break; 678 679 case -2: 680 callout_reset(&sc->sc_start_ch, hz >> 5, 681 spl_mtstart, sc); 682 return; 683 } 684 685 case MTRESET: 686 /* 687 * 1) selected device clear (send with "-2" secondary) 688 * 2) set timeout, then wait for "service request" 689 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 690 */ 691 if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){ 692 log(LOG_ERR, "%s can't reset", 693 sc->sc_dev.dv_xname); 694 goto fatalerror; 695 } 696 callout_reset(&sc->sc_intr_ch, 4 * hz, spl_mtintr, sc); 697 hpibawait(sc->sc_hpibno); 698 return; 699 700 case MTSET800BPI: 701 cmdbuf[0] = MTTC_800; 702 break; 703 704 case MTSET1600BPI: 705 cmdbuf[0] = MTTC_1600; 706 break; 707 708 case MTSET6250BPI: 709 cmdbuf[0] = MTTC_6250; 710 break; 711 712 case MTSET6250DC: 713 cmdbuf[0] = MTTC_DC6250; 714 break; 715 } 716 } else { 717 if (sc->sc_flags & MTF_PASTEOT) { 718 bp->b_error = ENOSPC; 719 goto errdone; 720 } 721 if (bp->b_flags & B_READ) { 722 sc->sc_flags |= MTF_IO; 723 cmdbuf[0] = MTTC_READ; 724 } else { 725 sc->sc_flags |= MTF_WRT | MTF_IO; 726 cmdbuf[0] = MTTC_WRITE; 727 cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 728 cmdcount = 2; 729 } 730 } 731 if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 732 == cmdcount) { 733 if (sc->sc_flags & MTF_REW) 734 goto done; 735 hpibawait(sc->sc_hpibno); 736 return; 737 } 738 fatalerror: 739 /* 740 * If anything fails, the drive is probably hosed, so mark it not 741 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 742 * if, last we heard, it was REWinding, remember that). 743 */ 744 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 745 bp->b_error = EIO; 746 errdone: 747 bp->b_flags |= B_ERROR; 748 done: 749 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 750 BUFQ_REMOVE(&sc->sc_tab, bp); 751 biodone(bp); 752 hpibfree(sc->sc_dev.dv_parent, &sc->sc_hq); 753 if ((bp = BUFQ_FIRST(&sc->sc_tab)) == NULL) 754 sc->sc_active = 0; 755 else 756 mtustart(sc); 757 } 758 759 /* 760 * The Utah code had a bug which meant that the driver was unable to read. 761 * "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized. 762 * -- ajv (at) comp.vuw.ac.nz 763 */ 764 void 765 mtgo(arg) 766 void *arg; 767 { 768 struct mt_softc *sc = arg; 769 struct buf *bp; 770 int rw; 771 772 dlog(LOG_DEBUG, "%s go", sc->sc_dev.dv_xname); 773 bp = BUFQ_FIRST(&sc->sc_tab); 774 rw = bp->b_flags & B_READ; 775 hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE, 776 bp->b_data, bp->b_bcount, rw, rw != 0); 777 } 778 779 void 780 mtintr(arg) 781 void *arg; 782 { 783 struct mt_softc *sc = arg; 784 struct buf *bp; 785 int i; 786 u_char cmdbuf[4]; 787 788 bp = BUFQ_FIRST(&sc->sc_tab); 789 if (bp == NULL) { 790 log(LOG_ERR, "%s intr: bp == NULL", sc->sc_dev.dv_xname); 791 return; 792 } 793 794 dlog(LOG_DEBUG, "%s intr", sc->sc_dev.dv_xname); 795 796 /* 797 * Some operation completed. Read status bytes and report errors. 798 * Clear EOF flags here `cause they're set once on specific conditions 799 * below when a command succeeds. 800 * A DSJ of 2 always means keep waiting. If the command was READ 801 * (and we're in data DMA phase) stop data transfer first. 802 */ 803 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 804 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 805 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 806 cmdbuf[0] = MTE_STOP; 807 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1); 808 } 809 switch (mtreaddsj(sc, 0)) { 810 case 0: 811 break; 812 813 case 1: 814 /* 815 * If we're in the middle of a READ/WRITE and have yet to 816 * start the data transfer, a DSJ of one should terminate it. 817 */ 818 sc->sc_flags &= ~MTF_IO; 819 break; 820 821 case 2: 822 (void) hpibawait(sc->sc_hpibno); 823 return; 824 825 case -2: 826 /* 827 * -2 means that the drive failed to respond quickly enough 828 * to the request for DSJ. It's probably just "busy" figuring 829 * it out and will know in a little bit... 830 */ 831 callout_reset(&sc->sc_intr_ch, hz >> 5, spl_mtintr, sc); 832 return; 833 834 default: 835 log(LOG_ERR, "%s intr: can't get drive stat", 836 sc->sc_dev.dv_xname); 837 goto error; 838 } 839 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 840 i = sc->sc_stat4 & SR4_ERCLMASK; 841 log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d", 842 sc->sc_dev.dv_xname, i == SR4_DEVICE ? "device" : 843 (i == SR4_PROTOCOL ? "protocol" : 844 (i == SR4_SELFTEST ? "selftest" : "unknown")), 845 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 846 sc->sc_stat3, sc->sc_stat5); 847 848 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 849 callout_stop(&sc->sc_intr_ch); 850 if (sc->sc_stat3 & SR3_POWERUP) 851 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 852 goto error; 853 } 854 /* 855 * Report and clear any soft errors. 856 */ 857 if (sc->sc_stat1 & SR1_SOFTERR) { 858 log(LOG_WARNING, "%s: soft error, retry %d\n", 859 sc->sc_dev.dv_xname, sc->sc_stat4 & SR4_RETRYMASK); 860 sc->sc_stat1 &= ~SR1_SOFTERR; 861 } 862 /* 863 * We've initiated a read or write, but haven't actually started to 864 * DMA the data yet. At this point, the drive's ready. 865 */ 866 if (sc->sc_flags & MTF_IO) { 867 sc->sc_flags &= ~MTF_IO; 868 if (hpibustart(sc->sc_hpibno)) 869 mtgo(sc); 870 return; 871 } 872 /* 873 * Check for End Of Tape - we're allowed to hit EOT and then write (or 874 * read) one more record. If we get here and have not already hit EOT, 875 * return ENOSPC to inform the process that it's hit it. If we get 876 * here and HAVE already hit EOT, don't allow any more operations that 877 * move the tape forward. 878 */ 879 if (sc->sc_stat1 & SR1_EOT) { 880 if (sc->sc_flags & MTF_ATEOT) 881 sc->sc_flags |= MTF_PASTEOT; 882 else { 883 bp->b_flags |= B_ERROR; 884 bp->b_error = ENOSPC; 885 sc->sc_flags |= MTF_ATEOT; 886 } 887 } 888 /* 889 * If a motion command was being executed, check for Tape Marks. 890 * If we were doing data, make sure we got the right amount, and 891 * check for hitting tape marks on reads. 892 */ 893 if (bp->b_flags & B_CMD) { 894 if (sc->sc_stat1 & SR1_EOF) { 895 if (bp->b_cmd == MTFSR) 896 sc->sc_flags |= MTF_HITEOF; 897 if (bp->b_cmd == MTBSR) 898 sc->sc_flags |= MTF_HITBOF; 899 } 900 if (bp->b_cmd == MTRESET) { 901 callout_stop(&sc->sc_intr_ch); 902 sc->sc_flags |= MTF_ALIVE; 903 } 904 } else { 905 i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2); 906 if (i != 2) { 907 log(LOG_ERR, "%s intr: can't get xfer length\n", 908 sc->sc_dev.dv_xname); 909 goto error; 910 } 911 i = (int) *((u_short *) cmdbuf); 912 if (i <= bp->b_bcount) { 913 if (i == 0) 914 sc->sc_flags |= MTF_HITEOF; 915 bp->b_resid = bp->b_bcount - i; 916 dlog(LOG_DEBUG, "%s intr: bcount %ld, resid %ld", 917 sc->sc_dev.dv_xname, bp->b_bcount, bp->b_resid); 918 } else { 919 tprintf(sc->sc_ttyp, 920 "%s: record (%d) larger than wanted (%ld)\n", 921 sc->sc_dev.dv_xname, i, bp->b_bcount); 922 error: 923 sc->sc_flags &= ~MTF_IO; 924 bp->b_error = EIO; 925 bp->b_flags |= B_ERROR; 926 } 927 } 928 /* 929 * The operation is completely done. 930 * Let the drive know with an END command. 931 */ 932 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 933 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1); 934 bp->b_flags &= ~B_CMD; 935 BUFQ_REMOVE(&sc->sc_tab, bp); 936 biodone(bp); 937 hpibfree(sc->sc_dev.dv_parent, &sc->sc_hq); 938 if (BUFQ_FIRST(&sc->sc_tab) == NULL) 939 sc->sc_active = 0; 940 else 941 mtustart(sc); 942 } 943 944 int 945 mtread(devvp, uio, flags) 946 struct vnode *devvp; 947 struct uio *uio; 948 int flags; 949 { 950 struct mt_softc *sc = vdev_privdata(devvp); 951 952 return(physio(mtstrategy, &sc->sc_bufstore, 953 devvp, B_READ, minphys, uio)); 954 } 955 956 int 957 mtwrite(devvp, uio, flags) 958 struct vnode *devvp; 959 struct uio *uio; 960 int flags; 961 { 962 struct mt_softc *sc = vdev_privdata(devvp); 963 964 return(physio(mtstrategy, &sc->sc_bufstore, 965 devvp, B_WRITE, minphys, uio)); 966 } 967 968 int 969 mtioctl(devvp, cmd, data, flag, p) 970 struct vnode *devvp; 971 u_long cmd; 972 caddr_t data; 973 int flag; 974 struct proc *p; 975 { 976 struct mtop *op; 977 int cnt; 978 979 switch (cmd) { 980 case MTIOCTOP: 981 op = (struct mtop *)data; 982 switch(op->mt_op) { 983 case MTWEOF: 984 case MTFSF: 985 case MTBSR: 986 case MTBSF: 987 case MTFSR: 988 cnt = op->mt_count; 989 break; 990 991 case MTOFFL: 992 case MTREW: 993 case MTNOP: 994 cnt = 0; 995 break; 996 997 default: 998 return (EINVAL); 999 } 1000 return (mtcommand(devvp, op->mt_op, cnt)); 1001 1002 case MTIOCGET: 1003 break; 1004 1005 default: 1006 return (EINVAL); 1007 } 1008 return (0); 1009 } 1010 1011 /*ARGSUSED*/ 1012 int 1013 mtdump(dev, blkno, va, size) 1014 dev_t dev; 1015 daddr_t blkno; 1016 caddr_t va; 1017 size_t size; 1018 { 1019 return (ENODEV); 1020 } 1021
Indexes created Wed Oct 15 16:09:53 GMT 2025