mt.c revision 1.45
1 /* $NetBSD: mt.c,v 1.45 2008/06/17 21:06:57 he 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 1.45 2008/06/17 21:06:57 he 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 struct buf sc_bufstore; /* XXX buffer storage */ 118 }; 119 120 #ifdef DEBUG 121 int mtdebug = 0; 122 #define dlog if (mtdebug) log 123 #else 124 #define dlog if (0) log 125 #endif 126 127 #define UNIT(x) (minor(x) & 3) 128 129 #define B_CMD B_DEVPRIVATE /* command buf instead of data */ 130 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */ 131 132 static int mtmatch(device_t, cfdata_t, void *); 133 static void mtattach(device_t, device_t, void *); 134 135 CFATTACH_DECL_NEW(mt, sizeof(struct mt_softc), 136 mtmatch, mtattach, NULL, NULL); 137 138 static dev_type_open(mtopen); 139 static dev_type_close(mtclose); 140 static dev_type_read(mtread); 141 static dev_type_write(mtwrite); 142 static dev_type_ioctl(mtioctl); 143 static dev_type_strategy(mtstrategy); 144 145 const struct bdevsw mt_bdevsw = { 146 mtopen, mtclose, mtstrategy, mtioctl, nodump, nosize, D_TAPE 147 }; 148 149 const struct cdevsw mt_cdevsw = { 150 mtopen, mtclose, mtread, mtwrite, mtioctl, 151 nostop, notty, nopoll, nommap, nokqfilter, D_TAPE 152 }; 153 154 static int mtident(struct mt_softc *, struct hpibbus_attach_args *); 155 static void mtustart(struct mt_softc *); 156 static int mtreaddsj(struct mt_softc *, int); 157 static int mtcommand(dev_t, int, int); 158 static void spl_mtintr(void *); 159 static void spl_mtstart(void *); 160 161 static void mtstart(void *); 162 static void mtgo(void *); 163 static void mtintr(void *); 164 165 static int 166 mtmatch(device_t parent, cfdata_t cf, void *aux) 167 { 168 struct hpibbus_attach_args *ha = aux; 169 170 return mtident(NULL, ha); 171 } 172 173 static void 174 mtattach(device_t parent, device_t self, void *aux) 175 { 176 struct mt_softc *sc = device_private(self); 177 struct hpibbus_attach_args *ha = aux; 178 int unit, hpibno, slave; 179 180 sc->sc_dev = self; 181 if (mtident(sc, ha) == 0) { 182 aprint_error(": impossible!\n"); 183 return; 184 } 185 186 unit = device_unit(self); 187 hpibno = device_unit(parent); 188 slave = ha->ha_slave; 189 190 bufq_alloc(&sc->sc_tab, "fcfs", 0); 191 callout_init(&sc->sc_start_ch, 0); 192 callout_init(&sc->sc_intr_ch, 0); 193 194 sc->sc_hpibno = hpibno; 195 sc->sc_slave = slave; 196 sc->sc_flags = MTF_EXISTS; 197 198 /* Initialize hpib job queue entry. */ 199 sc->sc_hq.hq_softc = sc; 200 sc->sc_hq.hq_slave = sc->sc_slave; 201 sc->sc_hq.hq_start = mtstart; 202 sc->sc_hq.hq_go = mtgo; 203 sc->sc_hq.hq_intr = mtintr; 204 } 205 206 static int 207 mtident(struct mt_softc *sc, struct hpibbus_attach_args *ha) 208 { 209 int i; 210 211 for (i = 0; i < nmtinfo; i++) { 212 if (ha->ha_id == mtinfo[i].hwid) { 213 if (sc != NULL) { 214 sc->sc_type = mtinfo[i].hwid; 215 aprint_normal(": %s tape\n", mtinfo[i].desc); 216 } 217 return 1; 218 } 219 } 220 return 0; 221 } 222 223 /* 224 * Perform a read of "Device Status Jump" register and update the 225 * status if necessary. If status is read, the given "ecmd" is also 226 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 227 * and -2 on "temporary" failure. 228 */ 229 static int 230 mtreaddsj(struct mt_softc *sc, 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 device_xname(sc->sc_dev)); 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", device_xname(sc->sc_dev), 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", device_xname(sc->sc_dev), 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 device_xname(sc->sc_dev)); 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 device_xname(sc->sc_dev), 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 static int 306 mtopen(dev_t dev, int flag, int mode, struct lwp *l) 307 { 308 struct mt_softc *sc; 309 int req_den; 310 int error; 311 312 sc = device_lookup_private(&mt_cd, UNIT(dev)); 313 if (sc == NULL) 314 return ENXIO; 315 316 if ((sc->sc_flags & MTF_EXISTS) == 0) 317 return ENXIO; 318 319 dlog(LOG_DEBUG, "%s open: flags 0x%x", device_xname(sc->sc_dev), 320 sc->sc_flags); 321 if (sc->sc_flags & MTF_OPEN) 322 return EBUSY; 323 sc->sc_flags |= MTF_OPEN; 324 sc->sc_ttyp = tprintf_open(l->l_proc); 325 if ((sc->sc_flags & MTF_ALIVE) == 0) { 326 error = mtcommand(dev, MTRESET, 0); 327 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 328 goto errout; 329 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 330 (void) mtcommand(dev, MTREW, 0); 331 } 332 for (;;) { 333 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 334 goto errout; 335 if (!(sc->sc_flags & MTF_REW)) 336 break; 337 if (tsleep((void *) &lbolt, PCATCH | (PZERO + 1), 338 "mt", 0) != 0) { 339 error = EINTR; 340 goto errout; 341 } 342 } 343 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 344 error = EROFS; 345 goto errout; 346 } 347 if (!(sc->sc_stat1 & SR1_ONLINE)) { 348 uprintf("%s: not online\n", device_xname(sc->sc_dev)); 349 error = EIO; 350 goto errout; 351 } 352 /* 353 * Select density: 354 * - find out what density the drive is set to 355 * (i.e. the density of the current tape) 356 * - if we are going to write 357 * - if we're not at the beginning of the tape 358 * - complain if we want to change densities 359 * - otherwise, select the mtcommand to set the density 360 * 361 * If the drive doesn't support it then don't change the recorded 362 * density. 363 * 364 * The original MOREbsd code had these additional conditions 365 * for the mid-tape change 366 * 367 * req_den != T_BADBPI && 368 * sc->sc_density != T_6250BPI 369 * 370 * which suggests that it would be possible to write multiple 371 * densities if req_den == T_BAD_BPI or the current tape 372 * density was 6250. Testing of our 7980 suggests that the 373 * device cannot change densities mid-tape. 374 * 375 * ajv (at) comp.vuw.ac.nz 376 */ 377 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 378 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 379 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 380 req_den = (dev & T_DENSEL); 381 382 if (flag & FWRITE) { 383 if (!(sc->sc_stat1 & SR1_BOT)) { 384 if (sc->sc_density != req_den) { 385 uprintf("%s: can't change density mid-tape\n", 386 device_xname(sc->sc_dev)); 387 error = EIO; 388 goto errout; 389 } 390 } 391 else { 392 int mtset_density = 393 (req_den == T_800BPI ? MTSET800BPI : ( 394 req_den == T_1600BPI ? MTSET1600BPI : ( 395 req_den == T_6250BPI ? MTSET6250BPI : ( 396 sc->sc_type == MT7980ID 397 ? MTSET6250DC 398 : MTSET6250BPI)))); 399 if (mtcommand(dev, mtset_density, 0) == 0) 400 sc->sc_density = req_den; 401 } 402 } 403 return 0; 404 errout: 405 sc->sc_flags &= ~MTF_OPEN; 406 return error; 407 } 408 409 static int 410 mtclose(dev_t dev, int flag, int fmt, struct lwp *l) 411 { 412 struct mt_softc *sc = device_lookup_private(&mt_cd,UNIT(dev)); 413 414 if (sc->sc_flags & MTF_WRT) { 415 (void) mtcommand(dev, MTWEOF, 2); 416 (void) mtcommand(dev, MTBSF, 0); 417 } 418 if ((minor(dev) & T_NOREWIND) == 0) 419 (void) mtcommand(dev, MTREW, 0); 420 sc->sc_flags &= ~MTF_OPEN; 421 tprintf_close(sc->sc_ttyp); 422 return 0; 423 } 424 425 static int 426 mtcommand(dev_t dev, int cmd, int cnt) 427 { 428 struct mt_softc *sc = device_lookup_private(&mt_cd,UNIT(dev)); 429 struct buf *bp = &sc->sc_bufstore; 430 int error = 0; 431 432 #if 1 433 if (bp->b_cflags & BC_BUSY) 434 return EBUSY; 435 #endif 436 bp->b_cmd = cmd; 437 bp->b_dev = dev; 438 do { 439 bp->b_cflags = BC_BUSY; 440 bp->b_flags = B_CMD; 441 mtstrategy(bp); 442 biowait(bp); 443 if (bp->b_error != 0) { 444 error = bp->b_error; 445 break; 446 } 447 } while (--cnt > 0); 448 #if 0 449 bp->b_flags = 0 /*&= ~BC_BUSY*/; 450 #else 451 bp->b_flags &= ~BC_BUSY; 452 #endif 453 return error; 454 } 455 456 /* 457 * Only thing to check here is for legal record lengths (writes only). 458 */ 459 static void 460 mtstrategy(struct buf *bp) 461 { 462 struct mt_softc *sc; 463 int s; 464 465 sc = device_lookup_private(&mt_cd,UNIT(bp->b_dev)); 466 dlog(LOG_DEBUG, "%s strategy", device_xname(sc->sc_dev)); 467 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 468 #define WRITE_BITS_IGNORED 8 469 #if 0 470 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 471 tprintf(sc->sc_ttyp, 472 "%s: write record must be multiple of %d\n", 473 device_xname(sc->sc_dev), 1 << WRITE_BITS_IGNORED); 474 goto error; 475 } 476 #endif 477 s = 16 * 1024; 478 if (sc->sc_stat2 & SR2_LONGREC) { 479 switch (sc->sc_density) { 480 case T_1600BPI: 481 s = 32 * 1024; 482 break; 483 484 case T_6250BPI: 485 case T_BADBPI: 486 s = 60 * 1024; 487 break; 488 } 489 } 490 if (bp->b_bcount > s) { 491 tprintf(sc->sc_ttyp, 492 "%s: write record (%d) too big: limit (%d)\n", 493 device_xname(sc->sc_dev), bp->b_bcount, s); 494 #if 0 /* XXX see above */ 495 error: 496 #endif 497 bp->b_error = EIO; 498 biodone(bp); 499 return; 500 } 501 } 502 s = splbio(); 503 BUFQ_PUT(sc->sc_tab, bp); 504 if (sc->sc_active == 0) { 505 sc->sc_active = 1; 506 mtustart(sc); 507 } 508 splx(s); 509 } 510 511 static void 512 mtustart(struct mt_softc *sc) 513 { 514 515 dlog(LOG_DEBUG, "%s ustart", device_xname(sc->sc_dev)); 516 if (hpibreq(device_parent(sc->sc_dev), &sc->sc_hq)) 517 mtstart(sc); 518 } 519 520 static void 521 spl_mtintr(void *arg) 522 { 523 struct mt_softc *sc = arg; 524 int s = splbio(); 525 526 hpibppclear(sc->sc_hpibno); 527 mtintr(sc); 528 splx(s); 529 } 530 531 static void 532 spl_mtstart(void *arg) 533 { 534 int s = splbio(); 535 536 mtstart(arg); 537 splx(s); 538 } 539 540 static void 541 mtstart(void *arg) 542 { 543 struct mt_softc *sc = arg; 544 struct buf *bp; 545 short cmdcount = 1; 546 u_char cmdbuf[2]; 547 548 dlog(LOG_DEBUG, "%s start", device_xname(sc->sc_dev)); 549 sc->sc_flags &= ~MTF_WRT; 550 bp = BUFQ_PEEK(sc->sc_tab); 551 if ((sc->sc_flags & MTF_ALIVE) == 0 && 552 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 553 goto fatalerror; 554 555 if (sc->sc_flags & MTF_REW) { 556 if (!hpibpptest(sc->sc_hpibno, sc->sc_slave)) 557 goto stillrew; 558 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 559 case 0: 560 case 1: 561 stillrew: 562 if ((sc->sc_stat1 & SR1_BOT) || 563 !(sc->sc_stat1 & SR1_ONLINE)) { 564 sc->sc_flags &= ~MTF_REW; 565 break; 566 } 567 case -2: 568 /* 569 * -2 means "timeout" reading DSJ, which is probably 570 * temporary. This is considered OK when doing a NOP, 571 * but not otherwise. 572 */ 573 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 574 callout_reset(&sc->sc_start_ch, hz >> 5, 575 spl_mtstart, sc); 576 return; 577 } 578 case 2: 579 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 580 bp->b_error = EBUSY; 581 goto done; 582 } 583 goto done; 584 585 default: 586 goto fatalerror; 587 } 588 } 589 if (bp->b_flags & B_CMD) { 590 if (sc->sc_flags & MTF_PASTEOT) { 591 switch(bp->b_cmd) { 592 case MTFSF: 593 case MTWEOF: 594 case MTFSR: 595 bp->b_error = ENOSPC; 596 goto done; 597 598 case MTBSF: 599 case MTOFFL: 600 case MTBSR: 601 case MTREW: 602 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 603 break; 604 } 605 } 606 switch(bp->b_cmd) { 607 case MTFSF: 608 if (sc->sc_flags & MTF_HITEOF) 609 goto done; 610 cmdbuf[0] = MTTC_FSF; 611 break; 612 613 case MTBSF: 614 if (sc->sc_flags & MTF_HITBOF) 615 goto done; 616 cmdbuf[0] = MTTC_BSF; 617 break; 618 619 case MTOFFL: 620 sc->sc_flags |= MTF_REW; 621 cmdbuf[0] = MTTC_REWOFF; 622 break; 623 624 case MTWEOF: 625 cmdbuf[0] = MTTC_WFM; 626 break; 627 628 case MTBSR: 629 cmdbuf[0] = MTTC_BSR; 630 break; 631 632 case MTFSR: 633 cmdbuf[0] = MTTC_FSR; 634 break; 635 636 case MTREW: 637 sc->sc_flags |= MTF_REW; 638 cmdbuf[0] = MTTC_REW; 639 break; 640 641 case MTNOP: 642 /* 643 * NOP is supposed to set status bits. 644 * Force readdsj to do it. 645 */ 646 switch (mtreaddsj(sc, 647 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 648 default: 649 goto done; 650 651 case -1: 652 /* 653 * If this fails, perform a device clear 654 * to fix any protocol problems and (most 655 * likely) get the status. 656 */ 657 bp->b_cmd = MTRESET; 658 break; 659 660 case -2: 661 callout_reset(&sc->sc_start_ch, hz >> 5, 662 spl_mtstart, sc); 663 return; 664 } 665 666 case MTRESET: 667 /* 668 * 1) selected device clear (send with "-2" secondary) 669 * 2) set timeout, then wait for "service request" 670 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 671 */ 672 if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){ 673 log(LOG_ERR, "%s can't reset", 674 device_xname(sc->sc_dev)); 675 goto fatalerror; 676 } 677 callout_reset(&sc->sc_intr_ch, 4 * hz, spl_mtintr, sc); 678 hpibawait(sc->sc_hpibno); 679 return; 680 681 case MTSET800BPI: 682 cmdbuf[0] = MTTC_800; 683 break; 684 685 case MTSET1600BPI: 686 cmdbuf[0] = MTTC_1600; 687 break; 688 689 case MTSET6250BPI: 690 cmdbuf[0] = MTTC_6250; 691 break; 692 693 case MTSET6250DC: 694 cmdbuf[0] = MTTC_DC6250; 695 break; 696 } 697 } else { 698 if (sc->sc_flags & MTF_PASTEOT) { 699 bp->b_error = ENOSPC; 700 goto done; 701 } 702 if (bp->b_flags & B_READ) { 703 sc->sc_flags |= MTF_IO; 704 cmdbuf[0] = MTTC_READ; 705 } else { 706 sc->sc_flags |= MTF_WRT | MTF_IO; 707 cmdbuf[0] = MTTC_WRITE; 708 cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 709 cmdcount = 2; 710 } 711 } 712 if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 713 == cmdcount) { 714 if (sc->sc_flags & MTF_REW) 715 goto done; 716 hpibawait(sc->sc_hpibno); 717 return; 718 } 719 fatalerror: 720 /* 721 * If anything fails, the drive is probably hosed, so mark it not 722 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 723 * if, last we heard, it was REWinding, remember that). 724 */ 725 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 726 bp->b_error = EIO; 727 done: 728 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 729 (void)BUFQ_GET(sc->sc_tab); 730 biodone(bp); 731 hpibfree(device_parent(sc->sc_dev), &sc->sc_hq); 732 if ((bp = BUFQ_PEEK(sc->sc_tab)) == NULL) 733 sc->sc_active = 0; 734 else 735 mtustart(sc); 736 } 737 738 /* 739 * The Utah code had a bug which meant that the driver was unable to read. 740 * "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized. 741 * -- ajv (at) comp.vuw.ac.nz 742 */ 743 static void 744 mtgo(void *arg) 745 { 746 struct mt_softc *sc = arg; 747 struct buf *bp; 748 int rw; 749 750 dlog(LOG_DEBUG, "%s go", device_xname(sc->sc_dev)); 751 bp = BUFQ_PEEK(sc->sc_tab); 752 rw = bp->b_flags & B_READ; 753 hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE, 754 bp->b_data, bp->b_bcount, rw, rw != 0); 755 } 756 757 static void 758 mtintr(void *arg) 759 { 760 struct mt_softc *sc = arg; 761 struct buf *bp; 762 int i; 763 u_char cmdbuf[4]; 764 765 bp = BUFQ_PEEK(sc->sc_tab); 766 if (bp == NULL) { 767 log(LOG_ERR, "%s intr: bp == NULL", device_xname(sc->sc_dev)); 768 return; 769 } 770 771 dlog(LOG_DEBUG, "%s intr", device_xname(sc->sc_dev)); 772 773 /* 774 * Some operation completed. Read status bytes and report errors. 775 * Clear EOF flags here `cause they're set once on specific conditions 776 * below when a command succeeds. 777 * A DSJ of 2 always means keep waiting. If the command was READ 778 * (and we're in data DMA phase) stop data transfer first. 779 */ 780 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 781 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 782 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 783 cmdbuf[0] = MTE_STOP; 784 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1); 785 } 786 switch (mtreaddsj(sc, 0)) { 787 case 0: 788 break; 789 790 case 1: 791 /* 792 * If we're in the middle of a READ/WRITE and have yet to 793 * start the data transfer, a DSJ of one should terminate it. 794 */ 795 sc->sc_flags &= ~MTF_IO; 796 break; 797 798 case 2: 799 (void) hpibawait(sc->sc_hpibno); 800 return; 801 802 case -2: 803 /* 804 * -2 means that the drive failed to respond quickly enough 805 * to the request for DSJ. It's probably just "busy" figuring 806 * it out and will know in a little bit... 807 */ 808 callout_reset(&sc->sc_intr_ch, hz >> 5, spl_mtintr, sc); 809 return; 810 811 default: 812 log(LOG_ERR, "%s intr: can't get drive stat", 813 device_xname(sc->sc_dev)); 814 goto error; 815 } 816 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 817 i = sc->sc_stat4 & SR4_ERCLMASK; 818 log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d", 819 device_xname(sc->sc_dev), i == SR4_DEVICE ? "device" : 820 (i == SR4_PROTOCOL ? "protocol" : 821 (i == SR4_SELFTEST ? "selftest" : "unknown")), 822 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 823 sc->sc_stat3, sc->sc_stat5); 824 825 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 826 callout_stop(&sc->sc_intr_ch); 827 if (sc->sc_stat3 & SR3_POWERUP) 828 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 829 goto error; 830 } 831 /* 832 * Report and clear any soft errors. 833 */ 834 if (sc->sc_stat1 & SR1_SOFTERR) { 835 log(LOG_WARNING, "%s: soft error, retry %d\n", 836 device_xname(sc->sc_dev), sc->sc_stat4 & SR4_RETRYMASK); 837 sc->sc_stat1 &= ~SR1_SOFTERR; 838 } 839 /* 840 * We've initiated a read or write, but haven't actually started to 841 * DMA the data yet. At this point, the drive's ready. 842 */ 843 if (sc->sc_flags & MTF_IO) { 844 sc->sc_flags &= ~MTF_IO; 845 if (hpibustart(sc->sc_hpibno)) 846 mtgo(sc); 847 return; 848 } 849 /* 850 * Check for End Of Tape - we're allowed to hit EOT and then write (or 851 * read) one more record. If we get here and have not already hit EOT, 852 * return ENOSPC to inform the process that it's hit it. If we get 853 * here and HAVE already hit EOT, don't allow any more operations that 854 * move the tape forward. 855 */ 856 if (sc->sc_stat1 & SR1_EOT) { 857 if (sc->sc_flags & MTF_ATEOT) 858 sc->sc_flags |= MTF_PASTEOT; 859 else { 860 bp->b_error = ENOSPC; 861 sc->sc_flags |= MTF_ATEOT; 862 } 863 } 864 /* 865 * If a motion command was being executed, check for Tape Marks. 866 * If we were doing data, make sure we got the right amount, and 867 * check for hitting tape marks on reads. 868 */ 869 if (bp->b_flags & B_CMD) { 870 if (sc->sc_stat1 & SR1_EOF) { 871 if (bp->b_cmd == MTFSR) 872 sc->sc_flags |= MTF_HITEOF; 873 if (bp->b_cmd == MTBSR) 874 sc->sc_flags |= MTF_HITBOF; 875 } 876 if (bp->b_cmd == MTRESET) { 877 callout_stop(&sc->sc_intr_ch); 878 sc->sc_flags |= MTF_ALIVE; 879 } 880 } else { 881 i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2); 882 if (i != 2) { 883 log(LOG_ERR, "%s intr: can't get xfer length\n", 884 device_xname(sc->sc_dev)); 885 goto error; 886 } 887 i = (int) *((u_short *) cmdbuf); 888 if (i <= bp->b_bcount) { 889 if (i == 0) 890 sc->sc_flags |= MTF_HITEOF; 891 bp->b_resid = bp->b_bcount - i; 892 dlog(LOG_DEBUG, "%s intr: bcount %d, resid %d", 893 device_xname(sc->sc_dev), bp->b_bcount, 894 bp->b_resid); 895 } else { 896 tprintf(sc->sc_ttyp, 897 "%s: record (%d) larger than wanted (%d)\n", 898 device_xname(sc->sc_dev), i, bp->b_bcount); 899 error: 900 sc->sc_flags &= ~MTF_IO; 901 bp->b_error = EIO; 902 } 903 } 904 /* 905 * The operation is completely done. 906 * Let the drive know with an END command. 907 */ 908 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 909 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1); 910 bp->b_flags &= ~B_CMD; 911 (void)BUFQ_GET(sc->sc_tab); 912 biodone(bp); 913 hpibfree(device_parent(sc->sc_dev), &sc->sc_hq); 914 if (BUFQ_PEEK(sc->sc_tab) == NULL) 915 sc->sc_active = 0; 916 else 917 mtustart(sc); 918 } 919 920 static int 921 mtread(dev_t dev, struct uio *uio, int flags) 922 { 923 struct mt_softc *sc = device_lookup_private(&mt_cd,UNIT(dev)); 924 925 return physio(mtstrategy, &sc->sc_bufstore, 926 dev, B_READ, minphys, uio); 927 } 928 929 static int 930 mtwrite(dev_t dev, struct uio *uio, int flags) 931 { 932 struct mt_softc *sc = device_lookup_private(&mt_cd,UNIT(dev)); 933 934 return physio(mtstrategy, &sc->sc_bufstore, 935 dev, B_WRITE, minphys, uio); 936 } 937 938 static int 939 mtioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 940 { 941 struct mtop *op; 942 int cnt; 943 944 switch (cmd) { 945 case MTIOCTOP: 946 op = (struct mtop *)data; 947 switch(op->mt_op) { 948 case MTWEOF: 949 case MTFSF: 950 case MTBSR: 951 case MTBSF: 952 case MTFSR: 953 cnt = op->mt_count; 954 break; 955 956 case MTOFFL: 957 case MTREW: 958 case MTNOP: 959 cnt = 0; 960 break; 961 962 default: 963 return EINVAL; 964 } 965 return mtcommand(dev, op->mt_op, cnt); 966 967 case MTIOCGET: 968 break; 969 970 default: 971 return EINVAL; 972 } 973 return 0; 974 } 975
Indexes created Wed Sep 24 05:09:52 GMT 2025