mt.c revision 1.54
1 /* $NetBSD: mt.c,v 1.54 2014/07/25 08:10:33 dholland 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 1.54 2014/07/25 08:10:33 dholland 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 .d_open = mtopen, 146 .d_close = mtclose, 147 .d_strategy = mtstrategy, 148 .d_ioctl = mtioctl, 149 .d_dump = nodump, 150 .d_psize = nosize, 151 .d_discard = nodiscard, 152 .d_flag = D_TAPE 153 }; 154 155 const struct cdevsw mt_cdevsw = { 156 .d_open = mtopen, 157 .d_close = mtclose, 158 .d_read = mtread, 159 .d_write = mtwrite, 160 .d_ioctl = mtioctl, 161 .d_stop = nostop, 162 .d_tty = notty, 163 .d_poll = nopoll, 164 .d_mmap = nommap, 165 .d_kqfilter = nokqfilter, 166 .d_discard = nodiscard, 167 .d_flag = D_TAPE 168 }; 169 170 static int mtident(struct mt_softc *, struct hpibbus_attach_args *); 171 static void mtustart(struct mt_softc *); 172 static int mtreaddsj(struct mt_softc *, int); 173 static int mtcommand(dev_t, int, int); 174 static void spl_mtintr(void *); 175 static void spl_mtstart(void *); 176 177 static void mtstart(void *); 178 static void mtgo(void *); 179 static void mtintr(void *); 180 181 static int 182 mtmatch(device_t parent, cfdata_t cf, void *aux) 183 { 184 struct hpibbus_attach_args *ha = aux; 185 186 return mtident(NULL, ha); 187 } 188 189 static void 190 mtattach(device_t parent, device_t self, void *aux) 191 { 192 struct mt_softc *sc = device_private(self); 193 struct hpibbus_attach_args *ha = aux; 194 int hpibno, slave; 195 196 sc->sc_dev = self; 197 if (mtident(sc, ha) == 0) { 198 aprint_error(": impossible!\n"); 199 return; 200 } 201 202 hpibno = device_unit(parent); 203 slave = ha->ha_slave; 204 205 bufq_alloc(&sc->sc_tab, "fcfs", 0); 206 callout_init(&sc->sc_start_ch, 0); 207 callout_init(&sc->sc_intr_ch, 0); 208 209 sc->sc_hpibno = hpibno; 210 sc->sc_slave = slave; 211 sc->sc_flags = MTF_EXISTS; 212 213 /* Initialize hpib job queue entry. */ 214 sc->sc_hq.hq_softc = sc; 215 sc->sc_hq.hq_slave = sc->sc_slave; 216 sc->sc_hq.hq_start = mtstart; 217 sc->sc_hq.hq_go = mtgo; 218 sc->sc_hq.hq_intr = mtintr; 219 } 220 221 static int 222 mtident(struct mt_softc *sc, struct hpibbus_attach_args *ha) 223 { 224 int i; 225 226 for (i = 0; i < nmtinfo; i++) { 227 if (ha->ha_id == mtinfo[i].hwid) { 228 if (sc != NULL) { 229 sc->sc_type = mtinfo[i].hwid; 230 aprint_normal(": %s tape\n", mtinfo[i].desc); 231 } 232 return 1; 233 } 234 } 235 return 0; 236 } 237 238 /* 239 * Perform a read of "Device Status Jump" register and update the 240 * status if necessary. If status is read, the given "ecmd" is also 241 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 242 * and -2 on "temporary" failure. 243 */ 244 static int 245 mtreaddsj(struct mt_softc *sc, int ecmd) 246 { 247 int retval; 248 249 if (sc->sc_flags & MTF_STATTIMEO) 250 goto getstats; 251 retval = hpibrecv(sc->sc_hpibno, 252 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 253 MTT_DSJ, &(sc->sc_lastdsj), 1); 254 sc->sc_flags &= ~MTF_DSJTIMEO; 255 if (retval != 1) { 256 dlog(LOG_DEBUG, "%s can't hpibrecv DSJ", 257 device_xname(sc->sc_dev)); 258 if (sc->sc_recvtimeo == 0) 259 sc->sc_recvtimeo = hz; 260 if (--sc->sc_recvtimeo == 0) 261 return -1; 262 if (retval == 0) 263 sc->sc_flags |= MTF_DSJTIMEO; 264 return -2; 265 } 266 sc->sc_recvtimeo = 0; 267 sc->sc_statindex = 0; 268 dlog(LOG_DEBUG, "%s readdsj: 0x%x", device_xname(sc->sc_dev), 269 sc->sc_lastdsj); 270 sc->sc_lastecmd = ecmd; 271 switch (sc->sc_lastdsj) { 272 case 0: 273 if (ecmd & MTE_DSJ_FORCE) 274 break; 275 return 0; 276 277 case 2: 278 sc->sc_lastecmd = MTE_COMPLETE; 279 case 1: 280 break; 281 282 default: 283 log(LOG_ERR, "%s readdsj: DSJ 0x%x\n", device_xname(sc->sc_dev), 284 sc->sc_lastdsj); 285 return -1; 286 } 287 getstats: 288 retval = hpibrecv(sc->sc_hpibno, 289 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, 290 MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex, 291 sizeof(sc->sc_stat) - sc->sc_statindex); 292 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 293 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 294 if (sc->sc_recvtimeo == 0) 295 sc->sc_recvtimeo = hz; 296 if (--sc->sc_recvtimeo != 0) { 297 if (retval >= 0) { 298 sc->sc_statindex += retval; 299 sc->sc_flags |= MTF_STATCONT; 300 } 301 sc->sc_flags |= MTF_STATTIMEO; 302 return -2; 303 } 304 log(LOG_ERR, "%s readdsj: can't read status", 305 device_xname(sc->sc_dev)); 306 return -1; 307 } 308 sc->sc_recvtimeo = 0; 309 sc->sc_statindex = 0; 310 dlog(LOG_DEBUG, "%s readdsj: status is %x %x %x %x %x %x", 311 device_xname(sc->sc_dev), 312 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 313 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6); 314 if (sc->sc_lastecmd) 315 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, 316 MTL_ECMD, &(sc->sc_lastecmd), 1); 317 return (int)sc->sc_lastdsj; 318 } 319 320 static int 321 mtopen(dev_t dev, int flag, int mode, struct lwp *l) 322 { 323 struct mt_softc *sc; 324 int req_den; 325 int error; 326 327 sc = device_lookup_private(&mt_cd, UNIT(dev)); 328 if (sc == NULL) 329 return ENXIO; 330 331 if ((sc->sc_flags & MTF_EXISTS) == 0) 332 return ENXIO; 333 334 dlog(LOG_DEBUG, "%s open: flags 0x%x", device_xname(sc->sc_dev), 335 sc->sc_flags); 336 if (sc->sc_flags & MTF_OPEN) 337 return EBUSY; 338 sc->sc_flags |= MTF_OPEN; 339 sc->sc_ttyp = tprintf_open(l->l_proc); 340 if ((sc->sc_flags & MTF_ALIVE) == 0) { 341 error = mtcommand(dev, MTRESET, 0); 342 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 343 goto errout; 344 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 345 (void) mtcommand(dev, MTREW, 0); 346 } 347 for (;;) { 348 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 349 goto errout; 350 if (!(sc->sc_flags & MTF_REW)) 351 break; 352 error = kpause("mt", true, hz, NULL); 353 if (error != 0 && error != EWOULDBLOCK) { 354 error = EINTR; 355 goto errout; 356 } 357 } 358 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 359 error = EROFS; 360 goto errout; 361 } 362 if (!(sc->sc_stat1 & SR1_ONLINE)) { 363 uprintf("%s: not online\n", device_xname(sc->sc_dev)); 364 error = EIO; 365 goto errout; 366 } 367 /* 368 * Select density: 369 * - find out what density the drive is set to 370 * (i.e. the density of the current tape) 371 * - if we are going to write 372 * - if we're not at the beginning of the tape 373 * - complain if we want to change densities 374 * - otherwise, select the mtcommand to set the density 375 * 376 * If the drive doesn't support it then don't change the recorded 377 * density. 378 * 379 * The original MOREbsd code had these additional conditions 380 * for the mid-tape change 381 * 382 * req_den != T_BADBPI && 383 * sc->sc_density != T_6250BPI 384 * 385 * which suggests that it would be possible to write multiple 386 * densities if req_den == T_BAD_BPI or the current tape 387 * density was 6250. Testing of our 7980 suggests that the 388 * device cannot change densities mid-tape. 389 * 390 * ajv (at) comp.vuw.ac.nz 391 */ 392 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 393 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 394 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 395 req_den = (dev & T_DENSEL); 396 397 if (flag & FWRITE) { 398 if (!(sc->sc_stat1 & SR1_BOT)) { 399 if (sc->sc_density != req_den) { 400 uprintf("%s: can't change density mid-tape\n", 401 device_xname(sc->sc_dev)); 402 error = EIO; 403 goto errout; 404 } 405 } 406 else { 407 int mtset_density = 408 (req_den == T_800BPI ? MTSET800BPI : ( 409 req_den == T_1600BPI ? MTSET1600BPI : ( 410 req_den == T_6250BPI ? MTSET6250BPI : ( 411 sc->sc_type == MT7980ID 412 ? MTSET6250DC 413 : MTSET6250BPI)))); 414 if (mtcommand(dev, mtset_density, 0) == 0) 415 sc->sc_density = req_den; 416 } 417 } 418 return 0; 419 errout: 420 sc->sc_flags &= ~MTF_OPEN; 421 return error; 422 } 423 424 static int 425 mtclose(dev_t dev, int flag, int fmt, struct lwp *l) 426 { 427 struct mt_softc *sc = device_lookup_private(&mt_cd,UNIT(dev)); 428 429 if (sc->sc_flags & MTF_WRT) { 430 (void) mtcommand(dev, MTWEOF, 2); 431 (void) mtcommand(dev, MTBSF, 0); 432 } 433 if ((minor(dev) & T_NOREWIND) == 0) 434 (void) mtcommand(dev, MTREW, 0); 435 sc->sc_flags &= ~MTF_OPEN; 436 tprintf_close(sc->sc_ttyp); 437 return 0; 438 } 439 440 static int 441 mtcommand(dev_t dev, int cmd, int cnt) 442 { 443 int error = 0; 444 buf_t *bp; 445 446 bp = getiobuf(NULL, true); 447 bp->b_cmd = cmd; 448 bp->b_dev = dev; 449 do { 450 bp->b_cflags = BC_BUSY; 451 bp->b_flags = B_CMD; 452 bp->b_oflags = 0; 453 mtstrategy(bp); 454 biowait(bp); 455 if (bp->b_error != 0) { 456 error = bp->b_error; 457 break; 458 } 459 } while (--cnt > 0); 460 putiobuf(bp); 461 462 return error; 463 } 464 465 /* 466 * Only thing to check here is for legal record lengths (writes only). 467 */ 468 static void 469 mtstrategy(struct buf *bp) 470 { 471 struct mt_softc *sc; 472 int s; 473 474 sc = device_lookup_private(&mt_cd,UNIT(bp->b_dev)); 475 dlog(LOG_DEBUG, "%s strategy", device_xname(sc->sc_dev)); 476 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 477 #define WRITE_BITS_IGNORED 8 478 #if 0 479 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 480 tprintf(sc->sc_ttyp, 481 "%s: write record must be multiple of %d\n", 482 device_xname(sc->sc_dev), 1 << WRITE_BITS_IGNORED); 483 goto error; 484 } 485 #endif 486 s = 16 * 1024; 487 if (sc->sc_stat2 & SR2_LONGREC) { 488 switch (sc->sc_density) { 489 case T_1600BPI: 490 s = 32 * 1024; 491 break; 492 493 case T_6250BPI: 494 case T_BADBPI: 495 s = 60 * 1024; 496 break; 497 } 498 } 499 if (bp->b_bcount > s) { 500 tprintf(sc->sc_ttyp, 501 "%s: write record (%d) too big: limit (%d)\n", 502 device_xname(sc->sc_dev), bp->b_bcount, s); 503 #if 0 /* XXX see above */ 504 error: 505 #endif 506 bp->b_error = EIO; 507 biodone(bp); 508 return; 509 } 510 } 511 s = splbio(); 512 bufq_put(sc->sc_tab, bp); 513 if (sc->sc_active == 0) { 514 sc->sc_active = 1; 515 mtustart(sc); 516 } 517 splx(s); 518 } 519 520 static void 521 mtustart(struct mt_softc *sc) 522 { 523 524 dlog(LOG_DEBUG, "%s ustart", device_xname(sc->sc_dev)); 525 if (hpibreq(device_parent(sc->sc_dev), &sc->sc_hq)) 526 mtstart(sc); 527 } 528 529 static void 530 spl_mtintr(void *arg) 531 { 532 struct mt_softc *sc = arg; 533 int s = splbio(); 534 535 hpibppclear(sc->sc_hpibno); 536 mtintr(sc); 537 splx(s); 538 } 539 540 static void 541 spl_mtstart(void *arg) 542 { 543 int s = splbio(); 544 545 mtstart(arg); 546 splx(s); 547 } 548 549 static void 550 mtstart(void *arg) 551 { 552 struct mt_softc *sc = arg; 553 struct buf *bp; 554 short cmdcount = 1; 555 u_char cmdbuf[2]; 556 557 dlog(LOG_DEBUG, "%s start", device_xname(sc->sc_dev)); 558 sc->sc_flags &= ~MTF_WRT; 559 bp = bufq_peek(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 callout_reset(&sc->sc_start_ch, hz >> 5, 584 spl_mtstart, sc); 585 return; 586 } 587 case 2: 588 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 589 bp->b_error = EBUSY; 590 goto done; 591 } 592 goto done; 593 594 default: 595 goto fatalerror; 596 } 597 } 598 if (bp->b_flags & B_CMD) { 599 if (sc->sc_flags & MTF_PASTEOT) { 600 switch(bp->b_cmd) { 601 case MTFSF: 602 case MTWEOF: 603 case MTFSR: 604 bp->b_error = ENOSPC; 605 goto done; 606 607 case MTBSF: 608 case MTOFFL: 609 case MTBSR: 610 case MTREW: 611 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 612 break; 613 } 614 } 615 switch(bp->b_cmd) { 616 case MTFSF: 617 if (sc->sc_flags & MTF_HITEOF) 618 goto done; 619 cmdbuf[0] = MTTC_FSF; 620 break; 621 622 case MTBSF: 623 if (sc->sc_flags & MTF_HITBOF) 624 goto done; 625 cmdbuf[0] = MTTC_BSF; 626 break; 627 628 case MTOFFL: 629 sc->sc_flags |= MTF_REW; 630 cmdbuf[0] = MTTC_REWOFF; 631 break; 632 633 case MTWEOF: 634 cmdbuf[0] = MTTC_WFM; 635 break; 636 637 case MTBSR: 638 cmdbuf[0] = MTTC_BSR; 639 break; 640 641 case MTFSR: 642 cmdbuf[0] = MTTC_FSR; 643 break; 644 645 case MTREW: 646 sc->sc_flags |= MTF_REW; 647 cmdbuf[0] = MTTC_REW; 648 break; 649 650 case MTNOP: 651 /* 652 * NOP is supposed to set status bits. 653 * Force readdsj to do it. 654 */ 655 switch (mtreaddsj(sc, 656 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 657 default: 658 goto done; 659 660 case -1: 661 /* 662 * If this fails, perform a device clear 663 * to fix any protocol problems and (most 664 * likely) get the status. 665 */ 666 bp->b_cmd = MTRESET; 667 break; 668 669 case -2: 670 callout_reset(&sc->sc_start_ch, hz >> 5, 671 spl_mtstart, sc); 672 return; 673 } 674 675 case MTRESET: 676 /* 677 * 1) selected device clear (send with "-2" secondary) 678 * 2) set timeout, then wait for "service request" 679 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 680 */ 681 if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){ 682 log(LOG_ERR, "%s can't reset", 683 device_xname(sc->sc_dev)); 684 goto fatalerror; 685 } 686 callout_reset(&sc->sc_intr_ch, 4 * hz, spl_mtintr, sc); 687 hpibawait(sc->sc_hpibno); 688 return; 689 690 case MTSET800BPI: 691 cmdbuf[0] = MTTC_800; 692 break; 693 694 case MTSET1600BPI: 695 cmdbuf[0] = MTTC_1600; 696 break; 697 698 case MTSET6250BPI: 699 cmdbuf[0] = MTTC_6250; 700 break; 701 702 case MTSET6250DC: 703 cmdbuf[0] = MTTC_DC6250; 704 break; 705 } 706 } else { 707 if (sc->sc_flags & MTF_PASTEOT) { 708 bp->b_error = ENOSPC; 709 goto done; 710 } 711 if (bp->b_flags & B_READ) { 712 sc->sc_flags |= MTF_IO; 713 cmdbuf[0] = MTTC_READ; 714 } else { 715 sc->sc_flags |= MTF_WRT | MTF_IO; 716 cmdbuf[0] = MTTC_WRITE; 717 cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 718 cmdcount = 2; 719 } 720 } 721 if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 722 == cmdcount) { 723 if (sc->sc_flags & MTF_REW) 724 goto done; 725 hpibawait(sc->sc_hpibno); 726 return; 727 } 728 fatalerror: 729 /* 730 * If anything fails, the drive is probably hosed, so mark it not 731 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 732 * if, last we heard, it was REWinding, remember that). 733 */ 734 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 735 bp->b_error = EIO; 736 done: 737 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 738 (void)bufq_get(sc->sc_tab); 739 biodone(bp); 740 hpibfree(device_parent(sc->sc_dev), &sc->sc_hq); 741 if ((bp = bufq_peek(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 static void 753 mtgo(void *arg) 754 { 755 struct mt_softc *sc = arg; 756 struct buf *bp; 757 int rw; 758 759 dlog(LOG_DEBUG, "%s go", device_xname(sc->sc_dev)); 760 bp = bufq_peek(sc->sc_tab); 761 rw = bp->b_flags & B_READ; 762 hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE, 763 bp->b_data, bp->b_bcount, rw, rw != 0); 764 } 765 766 static void 767 mtintr(void *arg) 768 { 769 struct mt_softc *sc = arg; 770 struct buf *bp; 771 int i; 772 u_char cmdbuf[4]; 773 774 bp = bufq_peek(sc->sc_tab); 775 if (bp == NULL) { 776 log(LOG_ERR, "%s intr: bp == NULL", device_xname(sc->sc_dev)); 777 return; 778 } 779 780 dlog(LOG_DEBUG, "%s intr", device_xname(sc->sc_dev)); 781 782 /* 783 * Some operation completed. Read status bytes and report errors. 784 * Clear EOF flags here `cause they're set once on specific conditions 785 * below when a command succeeds. 786 * A DSJ of 2 always means keep waiting. If the command was READ 787 * (and we're in data DMA phase) stop data transfer first. 788 */ 789 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 790 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 791 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 792 cmdbuf[0] = MTE_STOP; 793 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1); 794 } 795 switch (mtreaddsj(sc, 0)) { 796 case 0: 797 break; 798 799 case 1: 800 /* 801 * If we're in the middle of a READ/WRITE and have yet to 802 * start the data transfer, a DSJ of one should terminate it. 803 */ 804 sc->sc_flags &= ~MTF_IO; 805 break; 806 807 case 2: 808 (void) hpibawait(sc->sc_hpibno); 809 return; 810 811 case -2: 812 /* 813 * -2 means that the drive failed to respond quickly enough 814 * to the request for DSJ. It's probably just "busy" figuring 815 * it out and will know in a little bit... 816 */ 817 callout_reset(&sc->sc_intr_ch, hz >> 5, spl_mtintr, sc); 818 return; 819 820 default: 821 log(LOG_ERR, "%s intr: can't get drive stat", 822 device_xname(sc->sc_dev)); 823 goto error; 824 } 825 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 826 i = sc->sc_stat4 & SR4_ERCLMASK; 827 log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d", 828 device_xname(sc->sc_dev), i == SR4_DEVICE ? "device" : 829 (i == SR4_PROTOCOL ? "protocol" : 830 (i == SR4_SELFTEST ? "selftest" : "unknown")), 831 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 832 sc->sc_stat3, sc->sc_stat5); 833 834 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 835 callout_stop(&sc->sc_intr_ch); 836 if (sc->sc_stat3 & SR3_POWERUP) 837 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 838 goto error; 839 } 840 /* 841 * Report and clear any soft errors. 842 */ 843 if (sc->sc_stat1 & SR1_SOFTERR) { 844 log(LOG_WARNING, "%s: soft error, retry %d\n", 845 device_xname(sc->sc_dev), sc->sc_stat4 & SR4_RETRYMASK); 846 sc->sc_stat1 &= ~SR1_SOFTERR; 847 } 848 /* 849 * We've initiated a read or write, but haven't actually started to 850 * DMA the data yet. At this point, the drive's ready. 851 */ 852 if (sc->sc_flags & MTF_IO) { 853 sc->sc_flags &= ~MTF_IO; 854 if (hpibustart(sc->sc_hpibno)) 855 mtgo(sc); 856 return; 857 } 858 /* 859 * Check for End Of Tape - we're allowed to hit EOT and then write (or 860 * read) one more record. If we get here and have not already hit EOT, 861 * return ENOSPC to inform the process that it's hit it. If we get 862 * here and HAVE already hit EOT, don't allow any more operations that 863 * move the tape forward. 864 */ 865 if (sc->sc_stat1 & SR1_EOT) { 866 if (sc->sc_flags & MTF_ATEOT) 867 sc->sc_flags |= MTF_PASTEOT; 868 else { 869 bp->b_error = ENOSPC; 870 sc->sc_flags |= MTF_ATEOT; 871 } 872 } 873 /* 874 * If a motion command was being executed, check for Tape Marks. 875 * If we were doing data, make sure we got the right amount, and 876 * check for hitting tape marks on reads. 877 */ 878 if (bp->b_flags & B_CMD) { 879 if (sc->sc_stat1 & SR1_EOF) { 880 if (bp->b_cmd == MTFSR) 881 sc->sc_flags |= MTF_HITEOF; 882 if (bp->b_cmd == MTBSR) 883 sc->sc_flags |= MTF_HITBOF; 884 } 885 if (bp->b_cmd == MTRESET) { 886 callout_stop(&sc->sc_intr_ch); 887 sc->sc_flags |= MTF_ALIVE; 888 } 889 } else { 890 i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2); 891 if (i != 2) { 892 log(LOG_ERR, "%s intr: can't get xfer length\n", 893 device_xname(sc->sc_dev)); 894 goto error; 895 } 896 i = (int) *((u_short *) cmdbuf); 897 if (i <= bp->b_bcount) { 898 if (i == 0) 899 sc->sc_flags |= MTF_HITEOF; 900 bp->b_resid = bp->b_bcount - i; 901 dlog(LOG_DEBUG, "%s intr: bcount %d, resid %d", 902 device_xname(sc->sc_dev), bp->b_bcount, 903 bp->b_resid); 904 } else { 905 tprintf(sc->sc_ttyp, 906 "%s: record (%d) larger than wanted (%d)\n", 907 device_xname(sc->sc_dev), i, bp->b_bcount); 908 error: 909 sc->sc_flags &= ~MTF_IO; 910 bp->b_error = EIO; 911 } 912 } 913 /* 914 * The operation is completely done. 915 * Let the drive know with an END command. 916 */ 917 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 918 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1); 919 bp->b_flags &= ~B_CMD; 920 (void)bufq_get(sc->sc_tab); 921 biodone(bp); 922 hpibfree(device_parent(sc->sc_dev), &sc->sc_hq); 923 if (bufq_peek(sc->sc_tab) == NULL) 924 sc->sc_active = 0; 925 else 926 mtustart(sc); 927 } 928 929 static int 930 mtread(dev_t dev, struct uio *uio, int flags) 931 { 932 933 return physio(mtstrategy, NULL, dev, B_READ, minphys, uio); 934 } 935 936 static int 937 mtwrite(dev_t dev, struct uio *uio, int flags) 938 { 939 940 return physio(mtstrategy, NULL, dev, B_WRITE, minphys, uio); 941 } 942 943 static int 944 mtioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 945 { 946 struct mtop *op; 947 int cnt; 948 949 switch (cmd) { 950 case MTIOCTOP: 951 op = (struct mtop *)data; 952 switch(op->mt_op) { 953 case MTWEOF: 954 case MTFSF: 955 case MTBSR: 956 case MTBSF: 957 case MTFSR: 958 cnt = op->mt_count; 959 break; 960 961 case MTOFFL: 962 case MTREW: 963 case MTNOP: 964 cnt = 0; 965 break; 966 967 default: 968 return EINVAL; 969 } 970 return mtcommand(dev, op->mt_op, cnt); 971 972 case MTIOCGET: 973 break; 974 975 default: 976 return EINVAL; 977 } 978 return 0; 979 } 980
Indexes created Thu Sep 25 16:09:42 GMT 2025