mt.c revision 1.47
1 /* $NetBSD: mt.c,v 1.47 2009/05/18 20:41:57 ad 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1992, The University of Utah and 34 * the Computer Systems Laboratory at the University of Utah (CSL). 35 * All rights reserved. 36 * 37 * Permission to use, copy, modify and distribute this software is hereby 38 * granted provided that (1) source code retains these copyright, permission, 39 * and disclaimer notices, and (2) redistributions including binaries 40 * reproduce the notices in supporting documentation, and (3) all advertising 41 * materials mentioning features or use of this software display the following 42 * acknowledgement: ``This product includes software developed by the 43 * Computer Systems Laboratory at the University of Utah.'' 44 * 45 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS 46 * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF 47 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 48 * 49 * CSL requests users of this software to return to csl-dist (at) cs.utah.edu any 50 * improvements that they make and grant CSL redistribution rights. 51 * 52 * Utah $Hdr: mt.c 1.8 95/09/12$ 53 */ 54 /* @(#)mt.c 3.9 90/07/10 mt Xinu 55 * 56 * Magnetic tape driver (7974a, 7978a/b, 7979a, 7980a, 7980xc) 57 * Original version contributed by Mt. Xinu. 58 * Modified for 4.4BSD by Mark Davies and Andrew Vignaux, Department of 59 * Computer Science, Victoria University of Wellington 60 */ 61 62 #include <sys/cdefs.h> 63 __KERNEL_RCSID(0, "$NetBSD: mt.c,v 1.47 2009/05/18 20:41:57 ad Exp $"); 64 65 #include <sys/param.h> 66 #include <sys/systm.h> 67 #include <sys/callout.h> 68 #include <sys/buf.h> 69 #include <sys/bufq.h> 70 #include <sys/ioctl.h> 71 #include <sys/mtio.h> 72 #include <sys/file.h> 73 #include <sys/proc.h> 74 #include <sys/errno.h> 75 #include <sys/syslog.h> 76 #include <sys/tty.h> 77 #include <sys/kernel.h> 78 #include <sys/tprintf.h> 79 #include <sys/device.h> 80 #include <sys/conf.h> 81 82 #include <hp300/dev/hpibvar.h> 83 84 #include <hp300/dev/mtreg.h> 85 86 #include "ioconf.h" 87 88 static const struct mtinfo { 89 u_short hwid; 90 const char *desc; 91 } mtinfo[] = { 92 { MT7978ID, "7978" }, 93 { MT7979AID, "7979A" }, 94 { MT7980ID, "7980" }, 95 { MT7974AID, "7974A" }, 96 }; 97 static const int nmtinfo = sizeof(mtinfo) / sizeof(mtinfo[0]); 98 99 struct mt_softc { 100 device_t sc_dev; 101 struct callout sc_start_ch; 102 struct callout sc_intr_ch; 103 int sc_hpibno; /* logical HPIB this slave it attached to */ 104 int sc_slave; /* HPIB slave address (0-6) */ 105 short sc_flags; /* see below */ 106 u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */ 107 u_char sc_lastecmd; /* place for End Command in mtreaddsj() */ 108 short sc_recvtimeo; /* count of hpibsend timeouts to prevent hang */ 109 short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */ 110 struct mt_stat sc_stat;/* status bytes last read from device */ 111 short sc_density; /* current density of tape (mtio.h format) */ 112 short sc_type; /* tape drive model (hardware IDs) */ 113 struct hpibqueue sc_hq; /* HPIB device queue member */ 114 tpr_t sc_ttyp; 115 struct bufq_state *sc_tab;/* buf queue */ 116 int sc_active; 117 }; 118 119 #ifdef DEBUG 120 int mtdebug = 0; 121 #define dlog if (mtdebug) log 122 #else 123 #define dlog if (0) log 124 #endif 125 126 #define UNIT(x) (minor(x) & 3) 127 128 #define B_CMD B_DEVPRIVATE /* command buf instead of data */ 129 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */ 130 131 static int mtmatch(device_t, cfdata_t, void *); 132 static void mtattach(device_t, device_t, void *); 133 134 CFATTACH_DECL_NEW(mt, sizeof(struct mt_softc), 135 mtmatch, mtattach, NULL, NULL); 136 137 static dev_type_open(mtopen); 138 static dev_type_close(mtclose); 139 static dev_type_read(mtread); 140 static dev_type_write(mtwrite); 141 static dev_type_ioctl(mtioctl); 142 static dev_type_strategy(mtstrategy); 143 144 const struct bdevsw mt_bdevsw = { 145 mtopen, mtclose, mtstrategy, mtioctl, nodump, nosize, D_TAPE 146 }; 147 148 const struct cdevsw mt_cdevsw = { 149 mtopen, mtclose, mtread, mtwrite, mtioctl, 150 nostop, notty, nopoll, nommap, nokqfilter, D_TAPE 151 }; 152 153 static int mtident(struct mt_softc *, struct hpibbus_attach_args *); 154 static void mtustart(struct mt_softc *); 155 static int mtreaddsj(struct mt_softc *, int); 156 static int mtcommand(dev_t, int, int); 157 static void spl_mtintr(void *); 158 static void spl_mtstart(void *); 159 160 static void mtstart(void *); 161 static void mtgo(void *); 162 static void mtintr(void *); 163 164 static int 165 mtmatch(device_t parent, cfdata_t cf, void *aux) 166 { 167 struct hpibbus_attach_args *ha = aux; 168 169 return mtident(NULL, ha); 170 } 171 172 static void 173 mtattach(device_t parent, device_t self, void *aux) 174 { 175 struct mt_softc *sc = device_private(self); 176 struct hpibbus_attach_args *ha = aux; 177 int unit, hpibno, slave; 178 179 sc->sc_dev = self; 180 if (mtident(sc, ha) == 0) { 181 aprint_error(": impossible!\n"); 182 return; 183 } 184 185 unit = device_unit(self); 186 hpibno = device_unit(parent); 187 slave = ha->ha_slave; 188 189 bufq_alloc(&sc->sc_tab, "fcfs", 0); 190 callout_init(&sc->sc_start_ch, 0); 191 callout_init(&sc->sc_intr_ch, 0); 192 193 sc->sc_hpibno = hpibno; 194 sc->sc_slave = slave; 195 sc->sc_flags = MTF_EXISTS; 196 197 /* Initialize hpib job queue entry. */ 198 sc->sc_hq.hq_softc = sc; 199 sc->sc_hq.hq_slave = sc->sc_slave; 200 sc->sc_hq.hq_start = mtstart; 201 sc->sc_hq.hq_go = mtgo; 202 sc->sc_hq.hq_intr = mtintr; 203 } 204 205 static int 206 mtident(struct mt_softc *sc, struct hpibbus_attach_args *ha) 207 { 208 int i; 209 210 for (i = 0; i < nmtinfo; i++) { 211 if (ha->ha_id == mtinfo[i].hwid) { 212 if (sc != NULL) { 213 sc->sc_type = mtinfo[i].hwid; 214 aprint_normal(": %s tape\n", mtinfo[i].desc); 215 } 216 return 1; 217 } 218 } 219 return 0; 220 } 221 222 /* 223 * Perform a read of "Device Status Jump" register and update the 224 * status if necessary. If status is read, the given "ecmd" is also 225 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 226 * and -2 on "temporary" failure. 227 */ 228 static int 229 mtreaddsj(struct mt_softc *sc, int ecmd) 230 { 231 int retval; 232 233 if (sc->sc_flags & MTF_STATTIMEO) 234 goto getstats; 235 retval = hpibrecv(sc->sc_hpibno, 236 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 237 MTT_DSJ, &(sc->sc_lastdsj), 1); 238 sc->sc_flags &= ~MTF_DSJTIMEO; 239 if (retval != 1) { 240 dlog(LOG_DEBUG, "%s can't hpibrecv DSJ", 241 device_xname(sc->sc_dev)); 242 if (sc->sc_recvtimeo == 0) 243 sc->sc_recvtimeo = hz; 244 if (--sc->sc_recvtimeo == 0) 245 return -1; 246 if (retval == 0) 247 sc->sc_flags |= MTF_DSJTIMEO; 248 return -2; 249 } 250 sc->sc_recvtimeo = 0; 251 sc->sc_statindex = 0; 252 dlog(LOG_DEBUG, "%s readdsj: 0x%x", device_xname(sc->sc_dev), 253 sc->sc_lastdsj); 254 sc->sc_lastecmd = ecmd; 255 switch (sc->sc_lastdsj) { 256 case 0: 257 if (ecmd & MTE_DSJ_FORCE) 258 break; 259 return 0; 260 261 case 2: 262 sc->sc_lastecmd = MTE_COMPLETE; 263 case 1: 264 break; 265 266 default: 267 log(LOG_ERR, "%s readdsj: DSJ 0x%x\n", device_xname(sc->sc_dev), 268 sc->sc_lastdsj); 269 return -1; 270 } 271 getstats: 272 retval = hpibrecv(sc->sc_hpibno, 273 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, 274 MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex, 275 sizeof(sc->sc_stat) - sc->sc_statindex); 276 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 277 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 278 if (sc->sc_recvtimeo == 0) 279 sc->sc_recvtimeo = hz; 280 if (--sc->sc_recvtimeo != 0) { 281 if (retval >= 0) { 282 sc->sc_statindex += retval; 283 sc->sc_flags |= MTF_STATCONT; 284 } 285 sc->sc_flags |= MTF_STATTIMEO; 286 return -2; 287 } 288 log(LOG_ERR, "%s readdsj: can't read status", 289 device_xname(sc->sc_dev)); 290 return -1; 291 } 292 sc->sc_recvtimeo = 0; 293 sc->sc_statindex = 0; 294 dlog(LOG_DEBUG, "%s readdsj: status is %x %x %x %x %x %x", 295 device_xname(sc->sc_dev), 296 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 297 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6); 298 if (sc->sc_lastecmd) 299 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, 300 MTL_ECMD, &(sc->sc_lastecmd), 1); 301 return (int)sc->sc_lastdsj; 302 } 303 304 static int 305 mtopen(dev_t dev, int flag, int mode, struct lwp *l) 306 { 307 struct mt_softc *sc; 308 int req_den; 309 int error; 310 311 sc = device_lookup_private(&mt_cd, UNIT(dev)); 312 if (sc == NULL) 313 return ENXIO; 314 315 if ((sc->sc_flags & MTF_EXISTS) == 0) 316 return ENXIO; 317 318 dlog(LOG_DEBUG, "%s open: flags 0x%x", device_xname(sc->sc_dev), 319 sc->sc_flags); 320 if (sc->sc_flags & MTF_OPEN) 321 return EBUSY; 322 sc->sc_flags |= MTF_OPEN; 323 sc->sc_ttyp = tprintf_open(l->l_proc); 324 if ((sc->sc_flags & MTF_ALIVE) == 0) { 325 error = mtcommand(dev, MTRESET, 0); 326 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 327 goto errout; 328 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 329 (void) mtcommand(dev, MTREW, 0); 330 } 331 for (;;) { 332 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 333 goto errout; 334 if (!(sc->sc_flags & MTF_REW)) 335 break; 336 if (tsleep((void *) &lbolt, PCATCH | (PZERO + 1), 337 "mt", 0) != 0) { 338 error = EINTR; 339 goto errout; 340 } 341 } 342 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 343 error = EROFS; 344 goto errout; 345 } 346 if (!(sc->sc_stat1 & SR1_ONLINE)) { 347 uprintf("%s: not online\n", device_xname(sc->sc_dev)); 348 error = EIO; 349 goto errout; 350 } 351 /* 352 * Select density: 353 * - find out what density the drive is set to 354 * (i.e. the density of the current tape) 355 * - if we are going to write 356 * - if we're not at the beginning of the tape 357 * - complain if we want to change densities 358 * - otherwise, select the mtcommand to set the density 359 * 360 * If the drive doesn't support it then don't change the recorded 361 * density. 362 * 363 * The original MOREbsd code had these additional conditions 364 * for the mid-tape change 365 * 366 * req_den != T_BADBPI && 367 * sc->sc_density != T_6250BPI 368 * 369 * which suggests that it would be possible to write multiple 370 * densities if req_den == T_BAD_BPI or the current tape 371 * density was 6250. Testing of our 7980 suggests that the 372 * device cannot change densities mid-tape. 373 * 374 * ajv (at) comp.vuw.ac.nz 375 */ 376 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 377 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 378 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 379 req_den = (dev & T_DENSEL); 380 381 if (flag & FWRITE) { 382 if (!(sc->sc_stat1 & SR1_BOT)) { 383 if (sc->sc_density != req_den) { 384 uprintf("%s: can't change density mid-tape\n", 385 device_xname(sc->sc_dev)); 386 error = EIO; 387 goto errout; 388 } 389 } 390 else { 391 int mtset_density = 392 (req_den == T_800BPI ? MTSET800BPI : ( 393 req_den == T_1600BPI ? MTSET1600BPI : ( 394 req_den == T_6250BPI ? MTSET6250BPI : ( 395 sc->sc_type == MT7980ID 396 ? MTSET6250DC 397 : MTSET6250BPI)))); 398 if (mtcommand(dev, mtset_density, 0) == 0) 399 sc->sc_density = req_den; 400 } 401 } 402 return 0; 403 errout: 404 sc->sc_flags &= ~MTF_OPEN; 405 return error; 406 } 407 408 static int 409 mtclose(dev_t dev, int flag, int fmt, struct lwp *l) 410 { 411 struct mt_softc *sc = device_lookup_private(&mt_cd,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 static int 425 mtcommand(dev_t dev, int cmd, int cnt) 426 { 427 struct mt_softc *sc = device_lookup_private(&mt_cd,UNIT(dev)); 428 struct buf *bp = &sc->sc_bufstore; 429 int error = 0; 430 431 #if 1 432 if (bp->b_cflags & BC_BUSY) 433 return EBUSY; 434 #endif 435 bp->b_cmd = cmd; 436 bp->b_dev = dev; 437 do { 438 bp->b_cflags = BC_BUSY; 439 bp->b_flags = B_CMD; 440 mtstrategy(bp); 441 biowait(bp); 442 if (bp->b_error != 0) { 443 error = bp->b_error; 444 break; 445 } 446 } while (--cnt > 0); 447 #if 0 448 bp->b_flags = 0 /*&= ~BC_BUSY*/; 449 #else 450 bp->b_flags &= ~BC_BUSY; 451 #endif 452 return error; 453 } 454 455 /* 456 * Only thing to check here is for legal record lengths (writes only). 457 */ 458 static void 459 mtstrategy(struct buf *bp) 460 { 461 struct mt_softc *sc; 462 int s; 463 464 sc = device_lookup_private(&mt_cd,UNIT(bp->b_dev)); 465 dlog(LOG_DEBUG, "%s strategy", device_xname(sc->sc_dev)); 466 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 467 #define WRITE_BITS_IGNORED 8 468 #if 0 469 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 470 tprintf(sc->sc_ttyp, 471 "%s: write record must be multiple of %d\n", 472 device_xname(sc->sc_dev), 1 << WRITE_BITS_IGNORED); 473 goto error; 474 } 475 #endif 476 s = 16 * 1024; 477 if (sc->sc_stat2 & SR2_LONGREC) { 478 switch (sc->sc_density) { 479 case T_1600BPI: 480 s = 32 * 1024; 481 break; 482 483 case T_6250BPI: 484 case T_BADBPI: 485 s = 60 * 1024; 486 break; 487 } 488 } 489 if (bp->b_bcount > s) { 490 tprintf(sc->sc_ttyp, 491 "%s: write record (%d) too big: limit (%d)\n", 492 device_xname(sc->sc_dev), bp->b_bcount, s); 493 #if 0 /* XXX see above */ 494 error: 495 #endif 496 bp->b_error = EIO; 497 biodone(bp); 498 return; 499 } 500 } 501 s = splbio(); 502 bufq_put(sc->sc_tab, bp); 503 if (sc->sc_active == 0) { 504 sc->sc_active = 1; 505 mtustart(sc); 506 } 507 splx(s); 508 } 509 510 static void 511 mtustart(struct mt_softc *sc) 512 { 513 514 dlog(LOG_DEBUG, "%s ustart", device_xname(sc->sc_dev)); 515 if (hpibreq(device_parent(sc->sc_dev), &sc->sc_hq)) 516 mtstart(sc); 517 } 518 519 static void 520 spl_mtintr(void *arg) 521 { 522 struct mt_softc *sc = arg; 523 int s = splbio(); 524 525 hpibppclear(sc->sc_hpibno); 526 mtintr(sc); 527 splx(s); 528 } 529 530 static void 531 spl_mtstart(void *arg) 532 { 533 int s = splbio(); 534 535 mtstart(arg); 536 splx(s); 537 } 538 539 static void 540 mtstart(void *arg) 541 { 542 struct mt_softc *sc = arg; 543 struct buf *bp; 544 short cmdcount = 1; 545 u_char cmdbuf[2]; 546 547 dlog(LOG_DEBUG, "%s start", device_xname(sc->sc_dev)); 548 sc->sc_flags &= ~MTF_WRT; 549 bp = bufq_peek(sc->sc_tab); 550 if ((sc->sc_flags & MTF_ALIVE) == 0 && 551 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 552 goto fatalerror; 553 554 if (sc->sc_flags & MTF_REW) { 555 if (!hpibpptest(sc->sc_hpibno, sc->sc_slave)) 556 goto stillrew; 557 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 558 case 0: 559 case 1: 560 stillrew: 561 if ((sc->sc_stat1 & SR1_BOT) || 562 !(sc->sc_stat1 & SR1_ONLINE)) { 563 sc->sc_flags &= ~MTF_REW; 564 break; 565 } 566 case -2: 567 /* 568 * -2 means "timeout" reading DSJ, which is probably 569 * temporary. This is considered OK when doing a NOP, 570 * but not otherwise. 571 */ 572 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 573 callout_reset(&sc->sc_start_ch, hz >> 5, 574 spl_mtstart, sc); 575 return; 576 } 577 case 2: 578 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 579 bp->b_error = EBUSY; 580 goto done; 581 } 582 goto done; 583 584 default: 585 goto fatalerror; 586 } 587 } 588 if (bp->b_flags & B_CMD) { 589 if (sc->sc_flags & MTF_PASTEOT) { 590 switch(bp->b_cmd) { 591 case MTFSF: 592 case MTWEOF: 593 case MTFSR: 594 bp->b_error = ENOSPC; 595 goto done; 596 597 case MTBSF: 598 case MTOFFL: 599 case MTBSR: 600 case MTREW: 601 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 602 break; 603 } 604 } 605 switch(bp->b_cmd) { 606 case MTFSF: 607 if (sc->sc_flags & MTF_HITEOF) 608 goto done; 609 cmdbuf[0] = MTTC_FSF; 610 break; 611 612 case MTBSF: 613 if (sc->sc_flags & MTF_HITBOF) 614 goto done; 615 cmdbuf[0] = MTTC_BSF; 616 break; 617 618 case MTOFFL: 619 sc->sc_flags |= MTF_REW; 620 cmdbuf[0] = MTTC_REWOFF; 621 break; 622 623 case MTWEOF: 624 cmdbuf[0] = MTTC_WFM; 625 break; 626 627 case MTBSR: 628 cmdbuf[0] = MTTC_BSR; 629 break; 630 631 case MTFSR: 632 cmdbuf[0] = MTTC_FSR; 633 break; 634 635 case MTREW: 636 sc->sc_flags |= MTF_REW; 637 cmdbuf[0] = MTTC_REW; 638 break; 639 640 case MTNOP: 641 /* 642 * NOP is supposed to set status bits. 643 * Force readdsj to do it. 644 */ 645 switch (mtreaddsj(sc, 646 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 647 default: 648 goto done; 649 650 case -1: 651 /* 652 * If this fails, perform a device clear 653 * to fix any protocol problems and (most 654 * likely) get the status. 655 */ 656 bp->b_cmd = MTRESET; 657 break; 658 659 case -2: 660 callout_reset(&sc->sc_start_ch, hz >> 5, 661 spl_mtstart, sc); 662 return; 663 } 664 665 case MTRESET: 666 /* 667 * 1) selected device clear (send with "-2" secondary) 668 * 2) set timeout, then wait for "service request" 669 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 670 */ 671 if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){ 672 log(LOG_ERR, "%s can't reset", 673 device_xname(sc->sc_dev)); 674 goto fatalerror; 675 } 676 callout_reset(&sc->sc_intr_ch, 4 * hz, spl_mtintr, sc); 677 hpibawait(sc->sc_hpibno); 678 return; 679 680 case MTSET800BPI: 681 cmdbuf[0] = MTTC_800; 682 break; 683 684 case MTSET1600BPI: 685 cmdbuf[0] = MTTC_1600; 686 break; 687 688 case MTSET6250BPI: 689 cmdbuf[0] = MTTC_6250; 690 break; 691 692 case MTSET6250DC: 693 cmdbuf[0] = MTTC_DC6250; 694 break; 695 } 696 } else { 697 if (sc->sc_flags & MTF_PASTEOT) { 698 bp->b_error = ENOSPC; 699 goto done; 700 } 701 if (bp->b_flags & B_READ) { 702 sc->sc_flags |= MTF_IO; 703 cmdbuf[0] = MTTC_READ; 704 } else { 705 sc->sc_flags |= MTF_WRT | MTF_IO; 706 cmdbuf[0] = MTTC_WRITE; 707 cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 708 cmdcount = 2; 709 } 710 } 711 if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 712 == cmdcount) { 713 if (sc->sc_flags & MTF_REW) 714 goto done; 715 hpibawait(sc->sc_hpibno); 716 return; 717 } 718 fatalerror: 719 /* 720 * If anything fails, the drive is probably hosed, so mark it not 721 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 722 * if, last we heard, it was REWinding, remember that). 723 */ 724 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 725 bp->b_error = EIO; 726 done: 727 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 728 (void)bufq_get(sc->sc_tab); 729 biodone(bp); 730 hpibfree(device_parent(sc->sc_dev), &sc->sc_hq); 731 if ((bp = bufq_peek(sc->sc_tab)) == NULL) 732 sc->sc_active = 0; 733 else 734 mtustart(sc); 735 } 736 737 /* 738 * The Utah code had a bug which meant that the driver was unable to read. 739 * "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized. 740 * -- ajv (at) comp.vuw.ac.nz 741 */ 742 static void 743 mtgo(void *arg) 744 { 745 struct mt_softc *sc = arg; 746 struct buf *bp; 747 int rw; 748 749 dlog(LOG_DEBUG, "%s go", device_xname(sc->sc_dev)); 750 bp = bufq_peek(sc->sc_tab); 751 rw = bp->b_flags & B_READ; 752 hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE, 753 bp->b_data, bp->b_bcount, rw, rw != 0); 754 } 755 756 static void 757 mtintr(void *arg) 758 { 759 struct mt_softc *sc = arg; 760 struct buf *bp; 761 int i; 762 u_char cmdbuf[4]; 763 764 bp = bufq_peek(sc->sc_tab); 765 if (bp == NULL) { 766 log(LOG_ERR, "%s intr: bp == NULL", device_xname(sc->sc_dev)); 767 return; 768 } 769 770 dlog(LOG_DEBUG, "%s intr", device_xname(sc->sc_dev)); 771 772 /* 773 * Some operation completed. Read status bytes and report errors. 774 * Clear EOF flags here `cause they're set once on specific conditions 775 * below when a command succeeds. 776 * A DSJ of 2 always means keep waiting. If the command was READ 777 * (and we're in data DMA phase) stop data transfer first. 778 */ 779 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 780 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 781 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 782 cmdbuf[0] = MTE_STOP; 783 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1); 784 } 785 switch (mtreaddsj(sc, 0)) { 786 case 0: 787 break; 788 789 case 1: 790 /* 791 * If we're in the middle of a READ/WRITE and have yet to 792 * start the data transfer, a DSJ of one should terminate it. 793 */ 794 sc->sc_flags &= ~MTF_IO; 795 break; 796 797 case 2: 798 (void) hpibawait(sc->sc_hpibno); 799 return; 800 801 case -2: 802 /* 803 * -2 means that the drive failed to respond quickly enough 804 * to the request for DSJ. It's probably just "busy" figuring 805 * it out and will know in a little bit... 806 */ 807 callout_reset(&sc->sc_intr_ch, hz >> 5, spl_mtintr, sc); 808 return; 809 810 default: 811 log(LOG_ERR, "%s intr: can't get drive stat", 812 device_xname(sc->sc_dev)); 813 goto error; 814 } 815 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 816 i = sc->sc_stat4 & SR4_ERCLMASK; 817 log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d", 818 device_xname(sc->sc_dev), i == SR4_DEVICE ? "device" : 819 (i == SR4_PROTOCOL ? "protocol" : 820 (i == SR4_SELFTEST ? "selftest" : "unknown")), 821 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 822 sc->sc_stat3, sc->sc_stat5); 823 824 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 825 callout_stop(&sc->sc_intr_ch); 826 if (sc->sc_stat3 & SR3_POWERUP) 827 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 828 goto error; 829 } 830 /* 831 * Report and clear any soft errors. 832 */ 833 if (sc->sc_stat1 & SR1_SOFTERR) { 834 log(LOG_WARNING, "%s: soft error, retry %d\n", 835 device_xname(sc->sc_dev), sc->sc_stat4 & SR4_RETRYMASK); 836 sc->sc_stat1 &= ~SR1_SOFTERR; 837 } 838 /* 839 * We've initiated a read or write, but haven't actually started to 840 * DMA the data yet. At this point, the drive's ready. 841 */ 842 if (sc->sc_flags & MTF_IO) { 843 sc->sc_flags &= ~MTF_IO; 844 if (hpibustart(sc->sc_hpibno)) 845 mtgo(sc); 846 return; 847 } 848 /* 849 * Check for End Of Tape - we're allowed to hit EOT and then write (or 850 * read) one more record. If we get here and have not already hit EOT, 851 * return ENOSPC to inform the process that it's hit it. If we get 852 * here and HAVE already hit EOT, don't allow any more operations that 853 * move the tape forward. 854 */ 855 if (sc->sc_stat1 & SR1_EOT) { 856 if (sc->sc_flags & MTF_ATEOT) 857 sc->sc_flags |= MTF_PASTEOT; 858 else { 859 bp->b_error = ENOSPC; 860 sc->sc_flags |= MTF_ATEOT; 861 } 862 } 863 /* 864 * If a motion command was being executed, check for Tape Marks. 865 * If we were doing data, make sure we got the right amount, and 866 * check for hitting tape marks on reads. 867 */ 868 if (bp->b_flags & B_CMD) { 869 if (sc->sc_stat1 & SR1_EOF) { 870 if (bp->b_cmd == MTFSR) 871 sc->sc_flags |= MTF_HITEOF; 872 if (bp->b_cmd == MTBSR) 873 sc->sc_flags |= MTF_HITBOF; 874 } 875 if (bp->b_cmd == MTRESET) { 876 callout_stop(&sc->sc_intr_ch); 877 sc->sc_flags |= MTF_ALIVE; 878 } 879 } else { 880 i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2); 881 if (i != 2) { 882 log(LOG_ERR, "%s intr: can't get xfer length\n", 883 device_xname(sc->sc_dev)); 884 goto error; 885 } 886 i = (int) *((u_short *) cmdbuf); 887 if (i <= bp->b_bcount) { 888 if (i == 0) 889 sc->sc_flags |= MTF_HITEOF; 890 bp->b_resid = bp->b_bcount - i; 891 dlog(LOG_DEBUG, "%s intr: bcount %d, resid %d", 892 device_xname(sc->sc_dev), bp->b_bcount, 893 bp->b_resid); 894 } else { 895 tprintf(sc->sc_ttyp, 896 "%s: record (%d) larger than wanted (%d)\n", 897 device_xname(sc->sc_dev), i, bp->b_bcount); 898 error: 899 sc->sc_flags &= ~MTF_IO; 900 bp->b_error = EIO; 901 } 902 } 903 /* 904 * The operation is completely done. 905 * Let the drive know with an END command. 906 */ 907 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 908 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1); 909 bp->b_flags &= ~B_CMD; 910 (void)bufq_get(sc->sc_tab); 911 biodone(bp); 912 hpibfree(device_parent(sc->sc_dev), &sc->sc_hq); 913 if (bufq_peek(sc->sc_tab) == NULL) 914 sc->sc_active = 0; 915 else 916 mtustart(sc); 917 } 918 919 static int 920 mtread(dev_t dev, struct uio *uio, int flags) 921 { 922 struct mt_softc *sc = device_lookup_private(&mt_cd,UNIT(dev)); 923 924 return physio(mtstrategy, NULL, dev, B_READ, minphys, uio); 925 } 926 927 static int 928 mtwrite(dev_t dev, struct uio *uio, int flags) 929 { 930 struct mt_softc *sc = device_lookup_private(&mt_cd,UNIT(dev)); 931 932 return physio(mtstrategy, NULL, dev, B_WRITE, minphys, uio); 933 } 934 935 static int 936 mtioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 937 { 938 struct mtop *op; 939 int cnt; 940 941 switch (cmd) { 942 case MTIOCTOP: 943 op = (struct mtop *)data; 944 switch(op->mt_op) { 945 case MTWEOF: 946 case MTFSF: 947 case MTBSR: 948 case MTBSF: 949 case MTFSR: 950 cnt = op->mt_count; 951 break; 952 953 case MTOFFL: 954 case MTREW: 955 case MTNOP: 956 cnt = 0; 957 break; 958 959 default: 960 return EINVAL; 961 } 962 return mtcommand(dev, op->mt_op, cnt); 963 964 case MTIOCGET: 965 break; 966 967 default: 968 return EINVAL; 969 } 970 return 0; 971 } 972
Indexes created Fri Sep 26 20:09:58 GMT 2025