mt.c revision 1.51
1 /* $NetBSD: mt.c,v 1.51 2014/03/16 05:20:24 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 1.51 2014/03/16 05:20:24 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_flag = D_TAPE 152 }; 153 154 const struct cdevsw mt_cdevsw = { 155 .d_open = mtopen, 156 .d_close = mtclose, 157 .d_read = mtread, 158 .d_write = mtwrite, 159 .d_ioctl = mtioctl, 160 .d_stop = nostop, 161 .d_tty = notty, 162 .d_poll = nopoll, 163 .d_mmap = nommap, 164 .d_kqfilter = nokqfilter, 165 .d_flag = D_TAPE 166 }; 167 168 static int mtident(struct mt_softc *, struct hpibbus_attach_args *); 169 static void mtustart(struct mt_softc *); 170 static int mtreaddsj(struct mt_softc *, int); 171 static int mtcommand(dev_t, int, int); 172 static void spl_mtintr(void *); 173 static void spl_mtstart(void *); 174 175 static void mtstart(void *); 176 static void mtgo(void *); 177 static void mtintr(void *); 178 179 static int 180 mtmatch(device_t parent, cfdata_t cf, void *aux) 181 { 182 struct hpibbus_attach_args *ha = aux; 183 184 return mtident(NULL, ha); 185 } 186 187 static void 188 mtattach(device_t parent, device_t self, void *aux) 189 { 190 struct mt_softc *sc = device_private(self); 191 struct hpibbus_attach_args *ha = aux; 192 int unit, hpibno, slave; 193 194 sc->sc_dev = self; 195 if (mtident(sc, ha) == 0) { 196 aprint_error(": impossible!\n"); 197 return; 198 } 199 200 unit = device_unit(self); 201 hpibno = device_unit(parent); 202 slave = ha->ha_slave; 203 204 bufq_alloc(&sc->sc_tab, "fcfs", 0); 205 callout_init(&sc->sc_start_ch, 0); 206 callout_init(&sc->sc_intr_ch, 0); 207 208 sc->sc_hpibno = hpibno; 209 sc->sc_slave = slave; 210 sc->sc_flags = MTF_EXISTS; 211 212 /* Initialize hpib job queue entry. */ 213 sc->sc_hq.hq_softc = sc; 214 sc->sc_hq.hq_slave = sc->sc_slave; 215 sc->sc_hq.hq_start = mtstart; 216 sc->sc_hq.hq_go = mtgo; 217 sc->sc_hq.hq_intr = mtintr; 218 } 219 220 static int 221 mtident(struct mt_softc *sc, struct hpibbus_attach_args *ha) 222 { 223 int i; 224 225 for (i = 0; i < nmtinfo; i++) { 226 if (ha->ha_id == mtinfo[i].hwid) { 227 if (sc != NULL) { 228 sc->sc_type = mtinfo[i].hwid; 229 aprint_normal(": %s tape\n", mtinfo[i].desc); 230 } 231 return 1; 232 } 233 } 234 return 0; 235 } 236 237 /* 238 * Perform a read of "Device Status Jump" register and update the 239 * status if necessary. If status is read, the given "ecmd" is also 240 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 241 * and -2 on "temporary" failure. 242 */ 243 static int 244 mtreaddsj(struct mt_softc *sc, 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 device_xname(sc->sc_dev)); 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", device_xname(sc->sc_dev), 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", device_xname(sc->sc_dev), 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 device_xname(sc->sc_dev)); 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 device_xname(sc->sc_dev), 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 static int 320 mtopen(dev_t dev, int flag, int mode, struct lwp *l) 321 { 322 struct mt_softc *sc; 323 int req_den; 324 int error; 325 326 sc = device_lookup_private(&mt_cd, UNIT(dev)); 327 if (sc == NULL) 328 return ENXIO; 329 330 if ((sc->sc_flags & MTF_EXISTS) == 0) 331 return ENXIO; 332 333 dlog(LOG_DEBUG, "%s open: flags 0x%x", device_xname(sc->sc_dev), 334 sc->sc_flags); 335 if (sc->sc_flags & MTF_OPEN) 336 return EBUSY; 337 sc->sc_flags |= MTF_OPEN; 338 sc->sc_ttyp = tprintf_open(l->l_proc); 339 if ((sc->sc_flags & MTF_ALIVE) == 0) { 340 error = mtcommand(dev, MTRESET, 0); 341 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 342 goto errout; 343 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 344 (void) mtcommand(dev, MTREW, 0); 345 } 346 for (;;) { 347 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 348 goto errout; 349 if (!(sc->sc_flags & MTF_REW)) 350 break; 351 error = kpause("mt", true, hz, NULL); 352 if (error != 0 && error != EWOULDBLOCK) { 353 error = EINTR; 354 goto errout; 355 } 356 } 357 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 358 error = EROFS; 359 goto errout; 360 } 361 if (!(sc->sc_stat1 & SR1_ONLINE)) { 362 uprintf("%s: not online\n", device_xname(sc->sc_dev)); 363 error = EIO; 364 goto errout; 365 } 366 /* 367 * Select density: 368 * - find out what density the drive is set to 369 * (i.e. the density of the current tape) 370 * - if we are going to write 371 * - if we're not at the beginning of the tape 372 * - complain if we want to change densities 373 * - otherwise, select the mtcommand to set the density 374 * 375 * If the drive doesn't support it then don't change the recorded 376 * density. 377 * 378 * The original MOREbsd code had these additional conditions 379 * for the mid-tape change 380 * 381 * req_den != T_BADBPI && 382 * sc->sc_density != T_6250BPI 383 * 384 * which suggests that it would be possible to write multiple 385 * densities if req_den == T_BAD_BPI or the current tape 386 * density was 6250. Testing of our 7980 suggests that the 387 * device cannot change densities mid-tape. 388 * 389 * ajv (at) comp.vuw.ac.nz 390 */ 391 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 392 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 393 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 394 req_den = (dev & T_DENSEL); 395 396 if (flag & FWRITE) { 397 if (!(sc->sc_stat1 & SR1_BOT)) { 398 if (sc->sc_density != req_den) { 399 uprintf("%s: can't change density mid-tape\n", 400 device_xname(sc->sc_dev)); 401 error = EIO; 402 goto errout; 403 } 404 } 405 else { 406 int mtset_density = 407 (req_den == T_800BPI ? MTSET800BPI : ( 408 req_den == T_1600BPI ? MTSET1600BPI : ( 409 req_den == T_6250BPI ? MTSET6250BPI : ( 410 sc->sc_type == MT7980ID 411 ? MTSET6250DC 412 : MTSET6250BPI)))); 413 if (mtcommand(dev, mtset_density, 0) == 0) 414 sc->sc_density = req_den; 415 } 416 } 417 return 0; 418 errout: 419 sc->sc_flags &= ~MTF_OPEN; 420 return error; 421 } 422 423 static int 424 mtclose(dev_t dev, int flag, int fmt, struct lwp *l) 425 { 426 struct mt_softc *sc = device_lookup_private(&mt_cd,UNIT(dev)); 427 428 if (sc->sc_flags & MTF_WRT) { 429 (void) mtcommand(dev, MTWEOF, 2); 430 (void) mtcommand(dev, MTBSF, 0); 431 } 432 if ((minor(dev) & T_NOREWIND) == 0) 433 (void) mtcommand(dev, MTREW, 0); 434 sc->sc_flags &= ~MTF_OPEN; 435 tprintf_close(sc->sc_ttyp); 436 return 0; 437 } 438 439 static int 440 mtcommand(dev_t dev, int cmd, int cnt) 441 { 442 int error = 0; 443 buf_t *bp; 444 445 bp = getiobuf(NULL, true); 446 bp->b_cmd = cmd; 447 bp->b_dev = dev; 448 do { 449 bp->b_cflags = BC_BUSY; 450 bp->b_flags = B_CMD; 451 bp->b_oflags = 0; 452 mtstrategy(bp); 453 biowait(bp); 454 if (bp->b_error != 0) { 455 error = bp->b_error; 456 break; 457 } 458 } while (--cnt > 0); 459 putiobuf(bp); 460 461 return error; 462 } 463 464 /* 465 * Only thing to check here is for legal record lengths (writes only). 466 */ 467 static void 468 mtstrategy(struct buf *bp) 469 { 470 struct mt_softc *sc; 471 int s; 472 473 sc = device_lookup_private(&mt_cd,UNIT(bp->b_dev)); 474 dlog(LOG_DEBUG, "%s strategy", device_xname(sc->sc_dev)); 475 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 476 #define WRITE_BITS_IGNORED 8 477 #if 0 478 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 479 tprintf(sc->sc_ttyp, 480 "%s: write record must be multiple of %d\n", 481 device_xname(sc->sc_dev), 1 << WRITE_BITS_IGNORED); 482 goto error; 483 } 484 #endif 485 s = 16 * 1024; 486 if (sc->sc_stat2 & SR2_LONGREC) { 487 switch (sc->sc_density) { 488 case T_1600BPI: 489 s = 32 * 1024; 490 break; 491 492 case T_6250BPI: 493 case T_BADBPI: 494 s = 60 * 1024; 495 break; 496 } 497 } 498 if (bp->b_bcount > s) { 499 tprintf(sc->sc_ttyp, 500 "%s: write record (%d) too big: limit (%d)\n", 501 device_xname(sc->sc_dev), bp->b_bcount, s); 502 #if 0 /* XXX see above */ 503 error: 504 #endif 505 bp->b_error = EIO; 506 biodone(bp); 507 return; 508 } 509 } 510 s = splbio(); 511 bufq_put(sc->sc_tab, bp); 512 if (sc->sc_active == 0) { 513 sc->sc_active = 1; 514 mtustart(sc); 515 } 516 splx(s); 517 } 518 519 static void 520 mtustart(struct mt_softc *sc) 521 { 522 523 dlog(LOG_DEBUG, "%s ustart", device_xname(sc->sc_dev)); 524 if (hpibreq(device_parent(sc->sc_dev), &sc->sc_hq)) 525 mtstart(sc); 526 } 527 528 static void 529 spl_mtintr(void *arg) 530 { 531 struct mt_softc *sc = arg; 532 int s = splbio(); 533 534 hpibppclear(sc->sc_hpibno); 535 mtintr(sc); 536 splx(s); 537 } 538 539 static void 540 spl_mtstart(void *arg) 541 { 542 int s = splbio(); 543 544 mtstart(arg); 545 splx(s); 546 } 547 548 static void 549 mtstart(void *arg) 550 { 551 struct mt_softc *sc = arg; 552 struct buf *bp; 553 short cmdcount = 1; 554 u_char cmdbuf[2]; 555 556 dlog(LOG_DEBUG, "%s start", device_xname(sc->sc_dev)); 557 sc->sc_flags &= ~MTF_WRT; 558 bp = bufq_peek(sc->sc_tab); 559 if ((sc->sc_flags & MTF_ALIVE) == 0 && 560 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 561 goto fatalerror; 562 563 if (sc->sc_flags & MTF_REW) { 564 if (!hpibpptest(sc->sc_hpibno, sc->sc_slave)) 565 goto stillrew; 566 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 567 case 0: 568 case 1: 569 stillrew: 570 if ((sc->sc_stat1 & SR1_BOT) || 571 !(sc->sc_stat1 & SR1_ONLINE)) { 572 sc->sc_flags &= ~MTF_REW; 573 break; 574 } 575 case -2: 576 /* 577 * -2 means "timeout" reading DSJ, which is probably 578 * temporary. This is considered OK when doing a NOP, 579 * but not otherwise. 580 */ 581 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 582 callout_reset(&sc->sc_start_ch, hz >> 5, 583 spl_mtstart, sc); 584 return; 585 } 586 case 2: 587 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 588 bp->b_error = EBUSY; 589 goto done; 590 } 591 goto done; 592 593 default: 594 goto fatalerror; 595 } 596 } 597 if (bp->b_flags & B_CMD) { 598 if (sc->sc_flags & MTF_PASTEOT) { 599 switch(bp->b_cmd) { 600 case MTFSF: 601 case MTWEOF: 602 case MTFSR: 603 bp->b_error = ENOSPC; 604 goto done; 605 606 case MTBSF: 607 case MTOFFL: 608 case MTBSR: 609 case MTREW: 610 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 611 break; 612 } 613 } 614 switch(bp->b_cmd) { 615 case MTFSF: 616 if (sc->sc_flags & MTF_HITEOF) 617 goto done; 618 cmdbuf[0] = MTTC_FSF; 619 break; 620 621 case MTBSF: 622 if (sc->sc_flags & MTF_HITBOF) 623 goto done; 624 cmdbuf[0] = MTTC_BSF; 625 break; 626 627 case MTOFFL: 628 sc->sc_flags |= MTF_REW; 629 cmdbuf[0] = MTTC_REWOFF; 630 break; 631 632 case MTWEOF: 633 cmdbuf[0] = MTTC_WFM; 634 break; 635 636 case MTBSR: 637 cmdbuf[0] = MTTC_BSR; 638 break; 639 640 case MTFSR: 641 cmdbuf[0] = MTTC_FSR; 642 break; 643 644 case MTREW: 645 sc->sc_flags |= MTF_REW; 646 cmdbuf[0] = MTTC_REW; 647 break; 648 649 case MTNOP: 650 /* 651 * NOP is supposed to set status bits. 652 * Force readdsj to do it. 653 */ 654 switch (mtreaddsj(sc, 655 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 656 default: 657 goto done; 658 659 case -1: 660 /* 661 * If this fails, perform a device clear 662 * to fix any protocol problems and (most 663 * likely) get the status. 664 */ 665 bp->b_cmd = MTRESET; 666 break; 667 668 case -2: 669 callout_reset(&sc->sc_start_ch, hz >> 5, 670 spl_mtstart, sc); 671 return; 672 } 673 674 case MTRESET: 675 /* 676 * 1) selected device clear (send with "-2" secondary) 677 * 2) set timeout, then wait for "service request" 678 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 679 */ 680 if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){ 681 log(LOG_ERR, "%s can't reset", 682 device_xname(sc->sc_dev)); 683 goto fatalerror; 684 } 685 callout_reset(&sc->sc_intr_ch, 4 * hz, spl_mtintr, sc); 686 hpibawait(sc->sc_hpibno); 687 return; 688 689 case MTSET800BPI: 690 cmdbuf[0] = MTTC_800; 691 break; 692 693 case MTSET1600BPI: 694 cmdbuf[0] = MTTC_1600; 695 break; 696 697 case MTSET6250BPI: 698 cmdbuf[0] = MTTC_6250; 699 break; 700 701 case MTSET6250DC: 702 cmdbuf[0] = MTTC_DC6250; 703 break; 704 } 705 } else { 706 if (sc->sc_flags & MTF_PASTEOT) { 707 bp->b_error = ENOSPC; 708 goto done; 709 } 710 if (bp->b_flags & B_READ) { 711 sc->sc_flags |= MTF_IO; 712 cmdbuf[0] = MTTC_READ; 713 } else { 714 sc->sc_flags |= MTF_WRT | MTF_IO; 715 cmdbuf[0] = MTTC_WRITE; 716 cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 717 cmdcount = 2; 718 } 719 } 720 if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 721 == cmdcount) { 722 if (sc->sc_flags & MTF_REW) 723 goto done; 724 hpibawait(sc->sc_hpibno); 725 return; 726 } 727 fatalerror: 728 /* 729 * If anything fails, the drive is probably hosed, so mark it not 730 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 731 * if, last we heard, it was REWinding, remember that). 732 */ 733 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 734 bp->b_error = EIO; 735 done: 736 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 737 (void)bufq_get(sc->sc_tab); 738 biodone(bp); 739 hpibfree(device_parent(sc->sc_dev), &sc->sc_hq); 740 if ((bp = bufq_peek(sc->sc_tab)) == NULL) 741 sc->sc_active = 0; 742 else 743 mtustart(sc); 744 } 745 746 /* 747 * The Utah code had a bug which meant that the driver was unable to read. 748 * "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized. 749 * -- ajv (at) comp.vuw.ac.nz 750 */ 751 static void 752 mtgo(void *arg) 753 { 754 struct mt_softc *sc = arg; 755 struct buf *bp; 756 int rw; 757 758 dlog(LOG_DEBUG, "%s go", device_xname(sc->sc_dev)); 759 bp = bufq_peek(sc->sc_tab); 760 rw = bp->b_flags & B_READ; 761 hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE, 762 bp->b_data, bp->b_bcount, rw, rw != 0); 763 } 764 765 static void 766 mtintr(void *arg) 767 { 768 struct mt_softc *sc = arg; 769 struct buf *bp; 770 int i; 771 u_char cmdbuf[4]; 772 773 bp = bufq_peek(sc->sc_tab); 774 if (bp == NULL) { 775 log(LOG_ERR, "%s intr: bp == NULL", device_xname(sc->sc_dev)); 776 return; 777 } 778 779 dlog(LOG_DEBUG, "%s intr", device_xname(sc->sc_dev)); 780 781 /* 782 * Some operation completed. Read status bytes and report errors. 783 * Clear EOF flags here `cause they're set once on specific conditions 784 * below when a command succeeds. 785 * A DSJ of 2 always means keep waiting. If the command was READ 786 * (and we're in data DMA phase) stop data transfer first. 787 */ 788 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 789 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 790 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 791 cmdbuf[0] = MTE_STOP; 792 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1); 793 } 794 switch (mtreaddsj(sc, 0)) { 795 case 0: 796 break; 797 798 case 1: 799 /* 800 * If we're in the middle of a READ/WRITE and have yet to 801 * start the data transfer, a DSJ of one should terminate it. 802 */ 803 sc->sc_flags &= ~MTF_IO; 804 break; 805 806 case 2: 807 (void) hpibawait(sc->sc_hpibno); 808 return; 809 810 case -2: 811 /* 812 * -2 means that the drive failed to respond quickly enough 813 * to the request for DSJ. It's probably just "busy" figuring 814 * it out and will know in a little bit... 815 */ 816 callout_reset(&sc->sc_intr_ch, hz >> 5, spl_mtintr, sc); 817 return; 818 819 default: 820 log(LOG_ERR, "%s intr: can't get drive stat", 821 device_xname(sc->sc_dev)); 822 goto error; 823 } 824 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 825 i = sc->sc_stat4 & SR4_ERCLMASK; 826 log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d", 827 device_xname(sc->sc_dev), i == SR4_DEVICE ? "device" : 828 (i == SR4_PROTOCOL ? "protocol" : 829 (i == SR4_SELFTEST ? "selftest" : "unknown")), 830 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 831 sc->sc_stat3, sc->sc_stat5); 832 833 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 834 callout_stop(&sc->sc_intr_ch); 835 if (sc->sc_stat3 & SR3_POWERUP) 836 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 837 goto error; 838 } 839 /* 840 * Report and clear any soft errors. 841 */ 842 if (sc->sc_stat1 & SR1_SOFTERR) { 843 log(LOG_WARNING, "%s: soft error, retry %d\n", 844 device_xname(sc->sc_dev), sc->sc_stat4 & SR4_RETRYMASK); 845 sc->sc_stat1 &= ~SR1_SOFTERR; 846 } 847 /* 848 * We've initiated a read or write, but haven't actually started to 849 * DMA the data yet. At this point, the drive's ready. 850 */ 851 if (sc->sc_flags & MTF_IO) { 852 sc->sc_flags &= ~MTF_IO; 853 if (hpibustart(sc->sc_hpibno)) 854 mtgo(sc); 855 return; 856 } 857 /* 858 * Check for End Of Tape - we're allowed to hit EOT and then write (or 859 * read) one more record. If we get here and have not already hit EOT, 860 * return ENOSPC to inform the process that it's hit it. If we get 861 * here and HAVE already hit EOT, don't allow any more operations that 862 * move the tape forward. 863 */ 864 if (sc->sc_stat1 & SR1_EOT) { 865 if (sc->sc_flags & MTF_ATEOT) 866 sc->sc_flags |= MTF_PASTEOT; 867 else { 868 bp->b_error = ENOSPC; 869 sc->sc_flags |= MTF_ATEOT; 870 } 871 } 872 /* 873 * If a motion command was being executed, check for Tape Marks. 874 * If we were doing data, make sure we got the right amount, and 875 * check for hitting tape marks on reads. 876 */ 877 if (bp->b_flags & B_CMD) { 878 if (sc->sc_stat1 & SR1_EOF) { 879 if (bp->b_cmd == MTFSR) 880 sc->sc_flags |= MTF_HITEOF; 881 if (bp->b_cmd == MTBSR) 882 sc->sc_flags |= MTF_HITBOF; 883 } 884 if (bp->b_cmd == MTRESET) { 885 callout_stop(&sc->sc_intr_ch); 886 sc->sc_flags |= MTF_ALIVE; 887 } 888 } else { 889 i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2); 890 if (i != 2) { 891 log(LOG_ERR, "%s intr: can't get xfer length\n", 892 device_xname(sc->sc_dev)); 893 goto error; 894 } 895 i = (int) *((u_short *) cmdbuf); 896 if (i <= bp->b_bcount) { 897 if (i == 0) 898 sc->sc_flags |= MTF_HITEOF; 899 bp->b_resid = bp->b_bcount - i; 900 dlog(LOG_DEBUG, "%s intr: bcount %d, resid %d", 901 device_xname(sc->sc_dev), bp->b_bcount, 902 bp->b_resid); 903 } else { 904 tprintf(sc->sc_ttyp, 905 "%s: record (%d) larger than wanted (%d)\n", 906 device_xname(sc->sc_dev), i, bp->b_bcount); 907 error: 908 sc->sc_flags &= ~MTF_IO; 909 bp->b_error = EIO; 910 } 911 } 912 /* 913 * The operation is completely done. 914 * Let the drive know with an END command. 915 */ 916 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 917 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1); 918 bp->b_flags &= ~B_CMD; 919 (void)bufq_get(sc->sc_tab); 920 biodone(bp); 921 hpibfree(device_parent(sc->sc_dev), &sc->sc_hq); 922 if (bufq_peek(sc->sc_tab) == NULL) 923 sc->sc_active = 0; 924 else 925 mtustart(sc); 926 } 927 928 static int 929 mtread(dev_t dev, struct uio *uio, int flags) 930 { 931 932 return physio(mtstrategy, NULL, dev, B_READ, minphys, uio); 933 } 934 935 static int 936 mtwrite(dev_t dev, struct uio *uio, int flags) 937 { 938 939 return physio(mtstrategy, NULL, dev, B_WRITE, minphys, uio); 940 } 941 942 static int 943 mtioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 944 { 945 struct mtop *op; 946 int cnt; 947 948 switch (cmd) { 949 case MTIOCTOP: 950 op = (struct mtop *)data; 951 switch(op->mt_op) { 952 case MTWEOF: 953 case MTFSF: 954 case MTBSR: 955 case MTBSF: 956 case MTFSR: 957 cnt = op->mt_count; 958 break; 959 960 case MTOFFL: 961 case MTREW: 962 case MTNOP: 963 cnt = 0; 964 break; 965 966 default: 967 return EINVAL; 968 } 969 return mtcommand(dev, op->mt_op, cnt); 970 971 case MTIOCGET: 972 break; 973 974 default: 975 return EINVAL; 976 } 977 return 0; 978 } 979
Indexes created Tue Sep 23 02:09:52 GMT 2025