mt.c revision 1.42
1 /* $NetBSD: mt.c,v 1.42 2008/03/29 06:47:08 tsutsui Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1992, The University of Utah and 41 * the Computer Systems Laboratory at the University of Utah (CSL). 42 * All rights reserved. 43 * 44 * Permission to use, copy, modify and distribute this software is hereby 45 * granted provided that (1) source code retains these copyright, permission, 46 * and disclaimer notices, and (2) redistributions including binaries 47 * reproduce the notices in supporting documentation, and (3) all advertising 48 * materials mentioning features or use of this software display the following 49 * acknowledgement: ``This product includes software developed by the 50 * Computer Systems Laboratory at the University of Utah.'' 51 * 52 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS 53 * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF 54 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 55 * 56 * CSL requests users of this software to return to csl-dist (at) cs.utah.edu any 57 * improvements that they make and grant CSL redistribution rights. 58 * 59 * Utah $Hdr: mt.c 1.8 95/09/12$ 60 */ 61 /* @(#)mt.c 3.9 90/07/10 mt Xinu 62 * 63 * Magnetic tape driver (7974a, 7978a/b, 7979a, 7980a, 7980xc) 64 * Original version contributed by Mt. Xinu. 65 * Modified for 4.4BSD by Mark Davies and Andrew Vignaux, Department of 66 * Computer Science, Victoria University of Wellington 67 */ 68 69 #include <sys/cdefs.h> 70 __KERNEL_RCSID(0, "$NetBSD: mt.c,v 1.42 2008/03/29 06:47:08 tsutsui Exp $"); 71 72 #include <sys/param.h> 73 #include <sys/systm.h> 74 #include <sys/callout.h> 75 #include <sys/buf.h> 76 #include <sys/bufq.h> 77 #include <sys/ioctl.h> 78 #include <sys/mtio.h> 79 #include <sys/file.h> 80 #include <sys/proc.h> 81 #include <sys/errno.h> 82 #include <sys/syslog.h> 83 #include <sys/tty.h> 84 #include <sys/kernel.h> 85 #include <sys/tprintf.h> 86 #include <sys/device.h> 87 #include <sys/conf.h> 88 89 #include <hp300/dev/hpibvar.h> 90 91 #include <hp300/dev/mtreg.h> 92 93 #include "ioconf.h" 94 95 static const struct mtinfo { 96 u_short hwid; 97 const char *desc; 98 } mtinfo[] = { 99 { MT7978ID, "7978" }, 100 { MT7979AID, "7979A" }, 101 { MT7980ID, "7980" }, 102 { MT7974AID, "7974A" }, 103 }; 104 static const int nmtinfo = sizeof(mtinfo) / sizeof(mtinfo[0]); 105 106 struct mt_softc { 107 device_t sc_dev; 108 struct callout sc_start_ch; 109 struct callout sc_intr_ch; 110 int sc_hpibno; /* logical HPIB this slave it attached to */ 111 int sc_slave; /* HPIB slave address (0-6) */ 112 short sc_flags; /* see below */ 113 u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */ 114 u_char sc_lastecmd; /* place for End Command in mtreaddsj() */ 115 short sc_recvtimeo; /* count of hpibsend timeouts to prevent hang */ 116 short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */ 117 struct mt_stat sc_stat;/* status bytes last read from device */ 118 short sc_density; /* current density of tape (mtio.h format) */ 119 short sc_type; /* tape drive model (hardware IDs) */ 120 struct hpibqueue sc_hq; /* HPIB device queue member */ 121 tpr_t sc_ttyp; 122 struct bufq_state *sc_tab;/* buf queue */ 123 int sc_active; 124 struct buf sc_bufstore; /* XXX buffer storage */ 125 }; 126 127 #ifdef DEBUG 128 int mtdebug = 0; 129 #define dlog if (mtdebug) log 130 #else 131 #define dlog if (0) log 132 #endif 133 134 #define UNIT(x) (minor(x) & 3) 135 136 #define B_CMD B_DEVPRIVATE /* command buf instead of data */ 137 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */ 138 139 static int mtmatch(device_t, cfdata_t, void *); 140 static void mtattach(device_t, device_t, void *); 141 142 CFATTACH_DECL_NEW(mt, sizeof(struct mt_softc), 143 mtmatch, mtattach, NULL, NULL); 144 145 static dev_type_open(mtopen); 146 static dev_type_close(mtclose); 147 static dev_type_read(mtread); 148 static dev_type_write(mtwrite); 149 static dev_type_ioctl(mtioctl); 150 static dev_type_strategy(mtstrategy); 151 152 const struct bdevsw mt_bdevsw = { 153 mtopen, mtclose, mtstrategy, mtioctl, nodump, nosize, D_TAPE 154 }; 155 156 const struct cdevsw mt_cdevsw = { 157 mtopen, mtclose, mtread, mtwrite, mtioctl, 158 nostop, notty, nopoll, nommap, nokqfilter, D_TAPE 159 }; 160 161 static int mtident(struct mt_softc *, struct hpibbus_attach_args *); 162 static void mtustart(struct mt_softc *); 163 static int mtreaddsj(struct mt_softc *, int); 164 static int mtcommand(dev_t, int, int); 165 static void spl_mtintr(void *); 166 static void spl_mtstart(void *); 167 168 static void mtstart(void *); 169 static void mtgo(void *); 170 static void mtintr(void *); 171 172 static int 173 mtmatch(device_t parent, cfdata_t cf, void *aux) 174 { 175 struct hpibbus_attach_args *ha = aux; 176 177 return mtident(NULL, ha); 178 } 179 180 static void 181 mtattach(device_t parent, device_t self, void *aux) 182 { 183 struct mt_softc *sc = device_private(self); 184 struct hpibbus_attach_args *ha = aux; 185 int unit, hpibno, slave; 186 187 sc->sc_dev = self; 188 if (mtident(sc, ha) == 0) { 189 aprint_error(": impossible!\n"); 190 return; 191 } 192 193 unit = device_unit(self); 194 hpibno = device_unit(parent); 195 slave = ha->ha_slave; 196 197 bufq_alloc(&sc->sc_tab, "fcfs", 0); 198 callout_init(&sc->sc_start_ch, 0); 199 callout_init(&sc->sc_intr_ch, 0); 200 201 sc->sc_hpibno = hpibno; 202 sc->sc_slave = slave; 203 sc->sc_flags = MTF_EXISTS; 204 205 /* Initialize hpib job queue entry. */ 206 sc->sc_hq.hq_softc = sc; 207 sc->sc_hq.hq_slave = sc->sc_slave; 208 sc->sc_hq.hq_start = mtstart; 209 sc->sc_hq.hq_go = mtgo; 210 sc->sc_hq.hq_intr = mtintr; 211 } 212 213 static int 214 mtident(struct mt_softc *sc, struct hpibbus_attach_args *ha) 215 { 216 int i; 217 218 for (i = 0; i < nmtinfo; i++) { 219 if (ha->ha_id == mtinfo[i].hwid) { 220 if (sc != NULL) { 221 sc->sc_type = mtinfo[i].hwid; 222 aprint_normal(": %s tape\n", mtinfo[i].desc); 223 } 224 return 1; 225 } 226 } 227 return 0; 228 } 229 230 /* 231 * Perform a read of "Device Status Jump" register and update the 232 * status if necessary. If status is read, the given "ecmd" is also 233 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 234 * and -2 on "temporary" failure. 235 */ 236 static int 237 mtreaddsj(struct mt_softc *sc, int ecmd) 238 { 239 int retval; 240 241 if (sc->sc_flags & MTF_STATTIMEO) 242 goto getstats; 243 retval = hpibrecv(sc->sc_hpibno, 244 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 245 MTT_DSJ, &(sc->sc_lastdsj), 1); 246 sc->sc_flags &= ~MTF_DSJTIMEO; 247 if (retval != 1) { 248 dlog(LOG_DEBUG, "%s can't hpibrecv DSJ", 249 device_xname(sc->sc_dev)); 250 if (sc->sc_recvtimeo == 0) 251 sc->sc_recvtimeo = hz; 252 if (--sc->sc_recvtimeo == 0) 253 return -1; 254 if (retval == 0) 255 sc->sc_flags |= MTF_DSJTIMEO; 256 return -2; 257 } 258 sc->sc_recvtimeo = 0; 259 sc->sc_statindex = 0; 260 dlog(LOG_DEBUG, "%s readdsj: 0x%x", device_xname(sc->sc_dev), 261 sc->sc_lastdsj); 262 sc->sc_lastecmd = ecmd; 263 switch (sc->sc_lastdsj) { 264 case 0: 265 if (ecmd & MTE_DSJ_FORCE) 266 break; 267 return 0; 268 269 case 2: 270 sc->sc_lastecmd = MTE_COMPLETE; 271 case 1: 272 break; 273 274 default: 275 log(LOG_ERR, "%s readdsj: DSJ 0x%x\n", device_xname(sc->sc_dev), 276 sc->sc_lastdsj); 277 return -1; 278 } 279 getstats: 280 retval = hpibrecv(sc->sc_hpibno, 281 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, 282 MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex, 283 sizeof(sc->sc_stat) - sc->sc_statindex); 284 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 285 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 286 if (sc->sc_recvtimeo == 0) 287 sc->sc_recvtimeo = hz; 288 if (--sc->sc_recvtimeo != 0) { 289 if (retval >= 0) { 290 sc->sc_statindex += retval; 291 sc->sc_flags |= MTF_STATCONT; 292 } 293 sc->sc_flags |= MTF_STATTIMEO; 294 return -2; 295 } 296 log(LOG_ERR, "%s readdsj: can't read status", 297 device_xname(sc->sc_dev)); 298 return -1; 299 } 300 sc->sc_recvtimeo = 0; 301 sc->sc_statindex = 0; 302 dlog(LOG_DEBUG, "%s readdsj: status is %x %x %x %x %x %x", 303 device_xname(sc->sc_dev), 304 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 305 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6); 306 if (sc->sc_lastecmd) 307 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, 308 MTL_ECMD, &(sc->sc_lastecmd), 1); 309 return (int)sc->sc_lastdsj; 310 } 311 312 static int 313 mtopen(dev_t dev, int flag, int mode, struct lwp *l) 314 { 315 int unit = UNIT(dev); 316 struct mt_softc *sc; 317 int req_den; 318 int error; 319 320 if (unit >= mt_cd.cd_ndevs || 321 (sc = device_private(mt_cd.cd_devs[unit])) == NULL || 322 (sc->sc_flags & MTF_EXISTS) == 0) 323 return ENXIO; 324 325 dlog(LOG_DEBUG, "%s open: flags 0x%x", device_xname(sc->sc_dev), 326 sc->sc_flags); 327 if (sc->sc_flags & MTF_OPEN) 328 return EBUSY; 329 sc->sc_flags |= MTF_OPEN; 330 sc->sc_ttyp = tprintf_open(l->l_proc); 331 if ((sc->sc_flags & MTF_ALIVE) == 0) { 332 error = mtcommand(dev, MTRESET, 0); 333 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 334 goto errout; 335 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 336 (void) mtcommand(dev, MTREW, 0); 337 } 338 for (;;) { 339 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 340 goto errout; 341 if (!(sc->sc_flags & MTF_REW)) 342 break; 343 if (tsleep((void *) &lbolt, PCATCH | (PZERO + 1), 344 "mt", 0) != 0) { 345 error = EINTR; 346 goto errout; 347 } 348 } 349 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 350 error = EROFS; 351 goto errout; 352 } 353 if (!(sc->sc_stat1 & SR1_ONLINE)) { 354 uprintf("%s: not online\n", device_xname(sc->sc_dev)); 355 error = EIO; 356 goto errout; 357 } 358 /* 359 * Select density: 360 * - find out what density the drive is set to 361 * (i.e. the density of the current tape) 362 * - if we are going to write 363 * - if we're not at the beginning of the tape 364 * - complain if we want to change densities 365 * - otherwise, select the mtcommand to set the density 366 * 367 * If the drive doesn't support it then don't change the recorded 368 * density. 369 * 370 * The original MOREbsd code had these additional conditions 371 * for the mid-tape change 372 * 373 * req_den != T_BADBPI && 374 * sc->sc_density != T_6250BPI 375 * 376 * which suggests that it would be possible to write multiple 377 * densities if req_den == T_BAD_BPI or the current tape 378 * density was 6250. Testing of our 7980 suggests that the 379 * device cannot change densities mid-tape. 380 * 381 * ajv (at) comp.vuw.ac.nz 382 */ 383 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 384 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 385 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 386 req_den = (dev & T_DENSEL); 387 388 if (flag & FWRITE) { 389 if (!(sc->sc_stat1 & SR1_BOT)) { 390 if (sc->sc_density != req_den) { 391 uprintf("%s: can't change density mid-tape\n", 392 device_xname(sc->sc_dev)); 393 error = EIO; 394 goto errout; 395 } 396 } 397 else { 398 int mtset_density = 399 (req_den == T_800BPI ? MTSET800BPI : ( 400 req_den == T_1600BPI ? MTSET1600BPI : ( 401 req_den == T_6250BPI ? MTSET6250BPI : ( 402 sc->sc_type == MT7980ID 403 ? MTSET6250DC 404 : MTSET6250BPI)))); 405 if (mtcommand(dev, mtset_density, 0) == 0) 406 sc->sc_density = req_den; 407 } 408 } 409 return 0; 410 errout: 411 sc->sc_flags &= ~MTF_OPEN; 412 return error; 413 } 414 415 static int 416 mtclose(dev_t dev, int flag, int fmt, struct lwp *l) 417 { 418 struct mt_softc *sc = device_private(mt_cd.cd_devs[UNIT(dev)]); 419 420 if (sc->sc_flags & MTF_WRT) { 421 (void) mtcommand(dev, MTWEOF, 2); 422 (void) mtcommand(dev, MTBSF, 0); 423 } 424 if ((minor(dev) & T_NOREWIND) == 0) 425 (void) mtcommand(dev, MTREW, 0); 426 sc->sc_flags &= ~MTF_OPEN; 427 tprintf_close(sc->sc_ttyp); 428 return 0; 429 } 430 431 static int 432 mtcommand(dev_t dev, int cmd, int cnt) 433 { 434 struct mt_softc *sc = device_private(mt_cd.cd_devs[UNIT(dev)]); 435 struct buf *bp = &sc->sc_bufstore; 436 int error = 0; 437 438 #if 1 439 if (bp->b_cflags & BC_BUSY) 440 return EBUSY; 441 #endif 442 bp->b_cmd = cmd; 443 bp->b_dev = dev; 444 do { 445 bp->b_cflags = BC_BUSY; 446 bp->b_flags = B_CMD; 447 mtstrategy(bp); 448 biowait(bp); 449 if (bp->b_error != 0) { 450 error = bp->b_error; 451 break; 452 } 453 } while (--cnt > 0); 454 #if 0 455 bp->b_flags = 0 /*&= ~BC_BUSY*/; 456 #else 457 bp->b_flags &= ~BC_BUSY; 458 #endif 459 return error; 460 } 461 462 /* 463 * Only thing to check here is for legal record lengths (writes only). 464 */ 465 static void 466 mtstrategy(struct buf *bp) 467 { 468 struct mt_softc *sc; 469 int unit; 470 int s; 471 472 unit = UNIT(bp->b_dev); 473 sc = device_private(mt_cd.cd_devs[unit]); 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 struct mt_softc *sc = device_private(mt_cd.cd_devs[UNIT(dev)]); 932 933 return physio(mtstrategy, &sc->sc_bufstore, 934 dev, B_READ, minphys, uio); 935 } 936 937 static int 938 mtwrite(dev_t dev, struct uio *uio, int flags) 939 { 940 struct mt_softc *sc = device_private(mt_cd.cd_devs[UNIT(dev)]); 941 942 return physio(mtstrategy, &sc->sc_bufstore, 943 dev, B_WRITE, minphys, uio); 944 } 945 946 static int 947 mtioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 948 { 949 struct mtop *op; 950 int cnt; 951 952 switch (cmd) { 953 case MTIOCTOP: 954 op = (struct mtop *)data; 955 switch(op->mt_op) { 956 case MTWEOF: 957 case MTFSF: 958 case MTBSR: 959 case MTBSF: 960 case MTFSR: 961 cnt = op->mt_count; 962 break; 963 964 case MTOFFL: 965 case MTREW: 966 case MTNOP: 967 cnt = 0; 968 break; 969 970 default: 971 return EINVAL; 972 } 973 return mtcommand(dev, op->mt_op, cnt); 974 975 case MTIOCGET: 976 break; 977 978 default: 979 return EINVAL; 980 } 981 return 0; 982 } 983
Indexes created Fri Sep 26 20:09:58 GMT 2025