ld.c revision 1.101
1 /* $NetBSD: ld.c,v 1.101 2017/04/27 17:07:22 jdolecek Exp $ */ 2 3 /*- 4 * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran and Charles M. Hannum. 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 * Disk driver for use by RAID controllers. 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: ld.c,v 1.101 2017/04/27 17:07:22 jdolecek Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/device.h> 43 #include <sys/queue.h> 44 #include <sys/proc.h> 45 #include <sys/buf.h> 46 #include <sys/bufq.h> 47 #include <sys/endian.h> 48 #include <sys/disklabel.h> 49 #include <sys/disk.h> 50 #include <sys/dkio.h> 51 #include <sys/stat.h> 52 #include <sys/conf.h> 53 #include <sys/fcntl.h> 54 #include <sys/vnode.h> 55 #include <sys/syslog.h> 56 #include <sys/mutex.h> 57 #include <sys/module.h> 58 #include <sys/reboot.h> 59 60 #include <dev/ldvar.h> 61 62 static void ldminphys(struct buf *bp); 63 static bool ld_suspend(device_t, const pmf_qual_t *); 64 static bool ld_shutdown(device_t, int); 65 static int ld_diskstart(device_t, struct buf *bp); 66 static void ld_iosize(device_t, int *); 67 static int ld_dumpblocks(device_t, void *, daddr_t, int); 68 static void ld_fake_geometry(struct ld_softc *); 69 static void ld_set_geometry(struct ld_softc *); 70 static void ld_config_interrupts (device_t); 71 static int ld_lastclose(device_t); 72 static int ld_discard(device_t, off_t, off_t); 73 static int ld_flush(device_t, bool); 74 75 extern struct cfdriver ld_cd; 76 77 static dev_type_open(ldopen); 78 static dev_type_close(ldclose); 79 static dev_type_read(ldread); 80 static dev_type_write(ldwrite); 81 static dev_type_ioctl(ldioctl); 82 static dev_type_strategy(ldstrategy); 83 static dev_type_dump(lddump); 84 static dev_type_size(ldsize); 85 static dev_type_discard(lddiscard); 86 87 const struct bdevsw ld_bdevsw = { 88 .d_open = ldopen, 89 .d_close = ldclose, 90 .d_strategy = ldstrategy, 91 .d_ioctl = ldioctl, 92 .d_dump = lddump, 93 .d_psize = ldsize, 94 .d_discard = lddiscard, 95 .d_flag = D_DISK | D_MPSAFE 96 }; 97 98 const struct cdevsw ld_cdevsw = { 99 .d_open = ldopen, 100 .d_close = ldclose, 101 .d_read = ldread, 102 .d_write = ldwrite, 103 .d_ioctl = ldioctl, 104 .d_stop = nostop, 105 .d_tty = notty, 106 .d_poll = nopoll, 107 .d_mmap = nommap, 108 .d_kqfilter = nokqfilter, 109 .d_discard = lddiscard, 110 .d_flag = D_DISK | D_MPSAFE 111 }; 112 113 static struct dkdriver lddkdriver = { 114 .d_open = ldopen, 115 .d_close = ldclose, 116 .d_strategy = ldstrategy, 117 .d_iosize = ld_iosize, 118 .d_minphys = ldminphys, 119 .d_diskstart = ld_diskstart, 120 .d_dumpblocks = ld_dumpblocks, 121 .d_lastclose = ld_lastclose, 122 .d_discard = ld_discard 123 }; 124 125 void 126 ldattach(struct ld_softc *sc, const char *default_strategy) 127 { 128 device_t self = sc->sc_dv; 129 struct dk_softc *dksc = &sc->sc_dksc; 130 131 mutex_init(&sc->sc_mutex, MUTEX_DEFAULT, IPL_VM); 132 cv_init(&sc->sc_drain, "lddrain"); 133 134 if ((sc->sc_flags & LDF_ENABLED) == 0) { 135 return; 136 } 137 138 /* Initialise dk and disk structure. */ 139 dk_init(dksc, self, DKTYPE_LD); 140 disk_init(&dksc->sc_dkdev, dksc->sc_xname, &lddkdriver); 141 142 if (sc->sc_maxxfer > MAXPHYS) 143 sc->sc_maxxfer = MAXPHYS; 144 145 /* Build synthetic geometry if necessary. */ 146 if (sc->sc_nheads == 0 || sc->sc_nsectors == 0 || 147 sc->sc_ncylinders == 0) 148 ld_fake_geometry(sc); 149 150 sc->sc_disksize512 = sc->sc_secperunit * sc->sc_secsize / DEV_BSIZE; 151 152 if (sc->sc_flags & LDF_NO_RND) 153 dksc->sc_flags |= DKF_NO_RND; 154 155 /* Attach dk and disk subsystems */ 156 dk_attach(dksc); 157 disk_attach(&dksc->sc_dkdev); 158 ld_set_geometry(sc); 159 160 bufq_alloc(&dksc->sc_bufq, default_strategy, BUFQ_SORT_RAWBLOCK); 161 162 /* Register with PMF */ 163 if (!pmf_device_register1(dksc->sc_dev, ld_suspend, NULL, ld_shutdown)) 164 aprint_error_dev(dksc->sc_dev, 165 "couldn't establish power handler\n"); 166 167 /* Discover wedges on this disk. */ 168 config_interrupts(sc->sc_dv, ld_config_interrupts); 169 } 170 171 int 172 ldadjqparam(struct ld_softc *sc, int xmax) 173 { 174 175 mutex_enter(&sc->sc_mutex); 176 sc->sc_maxqueuecnt = xmax; 177 mutex_exit(&sc->sc_mutex); 178 179 return (0); 180 } 181 182 int 183 ldbegindetach(struct ld_softc *sc, int flags) 184 { 185 struct dk_softc *dksc = &sc->sc_dksc; 186 int rv = 0; 187 188 if ((sc->sc_flags & LDF_ENABLED) == 0) 189 return (0); 190 191 rv = disk_begindetach(&dksc->sc_dkdev, ld_lastclose, dksc->sc_dev, flags); 192 193 if (rv != 0) 194 return rv; 195 196 mutex_enter(&sc->sc_mutex); 197 sc->sc_maxqueuecnt = 0; 198 199 while (sc->sc_queuecnt > 0) { 200 sc->sc_flags |= LDF_DRAIN; 201 cv_wait(&sc->sc_drain, &sc->sc_mutex); 202 } 203 mutex_exit(&sc->sc_mutex); 204 205 return (rv); 206 } 207 208 void 209 ldenddetach(struct ld_softc *sc) 210 { 211 struct dk_softc *dksc = &sc->sc_dksc; 212 int bmaj, cmaj, i, mn; 213 214 if ((sc->sc_flags & LDF_ENABLED) == 0) 215 return; 216 217 mutex_enter(&sc->sc_mutex); 218 219 /* Wait for commands queued with the hardware to complete. */ 220 if (sc->sc_queuecnt != 0) { 221 if (cv_timedwait(&sc->sc_drain, &sc->sc_mutex, 30 * hz)) 222 printf("%s: not drained\n", dksc->sc_xname); 223 } 224 mutex_exit(&sc->sc_mutex); 225 226 /* Kill off any queued buffers. */ 227 dk_drain(dksc); 228 bufq_free(dksc->sc_bufq); 229 230 /* Locate the major numbers. */ 231 bmaj = bdevsw_lookup_major(&ld_bdevsw); 232 cmaj = cdevsw_lookup_major(&ld_cdevsw); 233 234 /* Nuke the vnodes for any open instances. */ 235 for (i = 0; i < MAXPARTITIONS; i++) { 236 mn = DISKMINOR(device_unit(dksc->sc_dev), i); 237 vdevgone(bmaj, mn, mn, VBLK); 238 vdevgone(cmaj, mn, mn, VCHR); 239 } 240 241 /* Delete all of our wedges. */ 242 dkwedge_delall(&dksc->sc_dkdev); 243 244 /* Detach from the disk list. */ 245 disk_detach(&dksc->sc_dkdev); 246 disk_destroy(&dksc->sc_dkdev); 247 248 dk_detach(dksc); 249 250 /* Deregister with PMF */ 251 pmf_device_deregister(dksc->sc_dev); 252 253 /* 254 * XXX We can't really flush the cache here, because the 255 * XXX device may already be non-existent from the controller's 256 * XXX perspective. 257 */ 258 #if 0 259 ld_flush(dksc->sc_dev, false); 260 #endif 261 cv_destroy(&sc->sc_drain); 262 mutex_destroy(&sc->sc_mutex); 263 } 264 265 /* ARGSUSED */ 266 static bool 267 ld_suspend(device_t dev, const pmf_qual_t *qual) 268 { 269 return ld_shutdown(dev, 0); 270 } 271 272 /* ARGSUSED */ 273 static bool 274 ld_shutdown(device_t dev, int flags) 275 { 276 if ((flags & RB_NOSYNC) == 0 && ld_flush(dev, true) != 0) 277 return false; 278 279 return true; 280 } 281 282 /* ARGSUSED */ 283 static int 284 ldopen(dev_t dev, int flags, int fmt, struct lwp *l) 285 { 286 struct ld_softc *sc; 287 struct dk_softc *dksc; 288 int unit; 289 290 unit = DISKUNIT(dev); 291 if ((sc = device_lookup_private(&ld_cd, unit)) == NULL) 292 return (ENXIO); 293 dksc = &sc->sc_dksc; 294 295 return dk_open(dksc, dev, flags, fmt, l); 296 } 297 298 static int 299 ld_lastclose(device_t self) 300 { 301 ld_flush(self, false); 302 303 return 0; 304 } 305 306 /* ARGSUSED */ 307 static int 308 ldclose(dev_t dev, int flags, int fmt, struct lwp *l) 309 { 310 struct ld_softc *sc; 311 struct dk_softc *dksc; 312 int unit; 313 314 unit = DISKUNIT(dev); 315 sc = device_lookup_private(&ld_cd, unit); 316 dksc = &sc->sc_dksc; 317 318 return dk_close(dksc, dev, flags, fmt, l); 319 } 320 321 /* ARGSUSED */ 322 static int 323 ldread(dev_t dev, struct uio *uio, int ioflag) 324 { 325 326 return (physio(ldstrategy, NULL, dev, B_READ, ldminphys, uio)); 327 } 328 329 /* ARGSUSED */ 330 static int 331 ldwrite(dev_t dev, struct uio *uio, int ioflag) 332 { 333 334 return (physio(ldstrategy, NULL, dev, B_WRITE, ldminphys, uio)); 335 } 336 337 /* ARGSUSED */ 338 static int 339 ldioctl(dev_t dev, u_long cmd, void *addr, int32_t flag, struct lwp *l) 340 { 341 struct ld_softc *sc; 342 struct dk_softc *dksc; 343 int unit, error; 344 345 unit = DISKUNIT(dev); 346 sc = device_lookup_private(&ld_cd, unit); 347 dksc = &sc->sc_dksc; 348 349 error = 0; 350 351 /* 352 * Some common checks so that individual attachments wouldn't need 353 * to duplicate them. 354 */ 355 switch (cmd) { 356 case DIOCCACHESYNC: 357 /* 358 * XXX Do we really need to care about having a writable 359 * file descriptor here? 360 */ 361 if ((flag & FWRITE) == 0) 362 error = EBADF; 363 else 364 error = 0; 365 break; 366 } 367 368 if (error != 0) 369 return (error); 370 371 if (sc->sc_ioctl) { 372 error = (*sc->sc_ioctl)(sc, cmd, addr, flag, 0); 373 if (error != EPASSTHROUGH) 374 return (error); 375 } 376 377 /* something not handled by the attachment */ 378 return dk_ioctl(dksc, dev, cmd, addr, flag, l); 379 } 380 381 /* 382 * Flush the device's cache. 383 */ 384 static int 385 ld_flush(device_t self, bool poll) 386 { 387 int error = 0; 388 struct ld_softc *sc = device_private(self); 389 390 if (sc->sc_ioctl) { 391 error = (*sc->sc_ioctl)(sc, DIOCCACHESYNC, NULL, 0, poll); 392 if (error != 0) 393 device_printf(self, "unable to flush cache\n"); 394 } 395 396 return error; 397 } 398 399 static void 400 ldstrategy(struct buf *bp) 401 { 402 struct ld_softc *sc; 403 struct dk_softc *dksc; 404 int unit; 405 406 unit = DISKUNIT(bp->b_dev); 407 sc = device_lookup_private(&ld_cd, unit); 408 dksc = &sc->sc_dksc; 409 410 dk_strategy(dksc, bp); 411 } 412 413 static int 414 ld_diskstart(device_t dev, struct buf *bp) 415 { 416 struct ld_softc *sc = device_private(dev); 417 int error; 418 419 if (sc->sc_queuecnt >= sc->sc_maxqueuecnt) 420 return EAGAIN; 421 422 mutex_enter(&sc->sc_mutex); 423 424 if (sc->sc_queuecnt >= sc->sc_maxqueuecnt) 425 error = EAGAIN; 426 else { 427 error = (*sc->sc_start)(sc, bp); 428 if (error == 0) 429 sc->sc_queuecnt++; 430 } 431 432 mutex_exit(&sc->sc_mutex); 433 434 return error; 435 } 436 437 void 438 lddone(struct ld_softc *sc, struct buf *bp) 439 { 440 struct dk_softc *dksc = &sc->sc_dksc; 441 442 dk_done(dksc, bp); 443 444 mutex_enter(&sc->sc_mutex); 445 if (--sc->sc_queuecnt <= sc->sc_maxqueuecnt) { 446 if ((sc->sc_flags & LDF_DRAIN) != 0) { 447 sc->sc_flags &= ~LDF_DRAIN; 448 cv_broadcast(&sc->sc_drain); 449 } 450 mutex_exit(&sc->sc_mutex); 451 dk_start(dksc, NULL); 452 } else 453 mutex_exit(&sc->sc_mutex); 454 } 455 456 static int 457 ldsize(dev_t dev) 458 { 459 struct ld_softc *sc; 460 struct dk_softc *dksc; 461 int unit; 462 463 unit = DISKUNIT(dev); 464 if ((sc = device_lookup_private(&ld_cd, unit)) == NULL) 465 return (-1); 466 dksc = &sc->sc_dksc; 467 468 if ((sc->sc_flags & LDF_ENABLED) == 0) 469 return (-1); 470 471 return dk_size(dksc, dev); 472 } 473 474 /* 475 * Take a dump. 476 */ 477 static int 478 lddump(dev_t dev, daddr_t blkno, void *va, size_t size) 479 { 480 struct ld_softc *sc; 481 struct dk_softc *dksc; 482 int unit; 483 484 unit = DISKUNIT(dev); 485 if ((sc = device_lookup_private(&ld_cd, unit)) == NULL) 486 return (ENXIO); 487 dksc = &sc->sc_dksc; 488 489 if ((sc->sc_flags & LDF_ENABLED) == 0) 490 return (ENODEV); 491 492 return dk_dump(dksc, dev, blkno, va, size); 493 } 494 495 static int 496 ld_dumpblocks(device_t dev, void *va, daddr_t blkno, int nblk) 497 { 498 struct ld_softc *sc = device_private(dev); 499 500 if (sc->sc_dump == NULL) 501 return (ENODEV); 502 503 return (*sc->sc_dump)(sc, va, blkno, nblk); 504 } 505 506 /* 507 * Adjust the size of a transfer. 508 */ 509 static void 510 ldminphys(struct buf *bp) 511 { 512 int unit; 513 struct ld_softc *sc; 514 515 unit = DISKUNIT(bp->b_dev); 516 sc = device_lookup_private(&ld_cd, unit); 517 518 ld_iosize(sc->sc_dv, &bp->b_bcount); 519 minphys(bp); 520 } 521 522 static void 523 ld_iosize(device_t d, int *countp) 524 { 525 struct ld_softc *sc = device_private(d); 526 527 if (*countp > sc->sc_maxxfer) 528 *countp = sc->sc_maxxfer; 529 } 530 531 static void 532 ld_fake_geometry(struct ld_softc *sc) 533 { 534 uint64_t ncyl; 535 536 if (sc->sc_secperunit <= 528 * 2048) /* 528MB */ 537 sc->sc_nheads = 16; 538 else if (sc->sc_secperunit <= 1024 * 2048) /* 1GB */ 539 sc->sc_nheads = 32; 540 else if (sc->sc_secperunit <= 21504 * 2048) /* 21GB */ 541 sc->sc_nheads = 64; 542 else if (sc->sc_secperunit <= 43008 * 2048) /* 42GB */ 543 sc->sc_nheads = 128; 544 else 545 sc->sc_nheads = 255; 546 547 sc->sc_nsectors = 63; 548 sc->sc_ncylinders = INT_MAX; 549 ncyl = sc->sc_secperunit / 550 (sc->sc_nheads * sc->sc_nsectors); 551 if (ncyl < INT_MAX) 552 sc->sc_ncylinders = (int)ncyl; 553 } 554 555 static void 556 ld_set_geometry(struct ld_softc *sc) 557 { 558 struct dk_softc *dksc = &sc->sc_dksc; 559 struct disk_geom *dg = &dksc->sc_dkdev.dk_geom; 560 char tbuf[9]; 561 562 format_bytes(tbuf, sizeof(tbuf), sc->sc_secperunit * 563 sc->sc_secsize); 564 aprint_normal_dev(dksc->sc_dev, "%s, %d cyl, %d head, %d sec, " 565 "%d bytes/sect x %"PRIu64" sectors\n", 566 tbuf, sc->sc_ncylinders, sc->sc_nheads, 567 sc->sc_nsectors, sc->sc_secsize, sc->sc_secperunit); 568 569 memset(dg, 0, sizeof(*dg)); 570 dg->dg_secperunit = sc->sc_secperunit; 571 dg->dg_secsize = sc->sc_secsize; 572 dg->dg_nsectors = sc->sc_nsectors; 573 dg->dg_ntracks = sc->sc_nheads; 574 dg->dg_ncylinders = sc->sc_ncylinders; 575 576 disk_set_info(dksc->sc_dev, &dksc->sc_dkdev, NULL); 577 } 578 579 static void 580 ld_config_interrupts(device_t d) 581 { 582 struct ld_softc *sc = device_private(d); 583 struct dk_softc *dksc = &sc->sc_dksc; 584 585 dkwedge_discover(&dksc->sc_dkdev); 586 } 587 588 static int 589 ld_discard(device_t dev, off_t pos, off_t len) 590 { 591 struct ld_softc *sc = device_private(dev); 592 593 if (sc->sc_discard == NULL) 594 return (ENODEV); 595 596 return (*sc->sc_discard)(sc, pos, len); 597 } 598 599 static int 600 lddiscard(dev_t dev, off_t pos, off_t len) 601 { 602 struct ld_softc *sc; 603 struct dk_softc *dksc; 604 int unit; 605 606 unit = DISKUNIT(dev); 607 sc = device_lookup_private(&ld_cd, unit); 608 dksc = &sc->sc_dksc; 609 610 return dk_discard(dksc, dev, pos, len); 611 } 612 613 MODULE(MODULE_CLASS_DRIVER, ld, "dk_subr"); 614 615 #ifdef _MODULE 616 CFDRIVER_DECL(ld, DV_DISK, NULL); 617 #endif 618 619 static int 620 ld_modcmd(modcmd_t cmd, void *opaque) 621 { 622 #ifdef _MODULE 623 devmajor_t bmajor, cmajor; 624 #endif 625 int error = 0; 626 627 #ifdef _MODULE 628 switch (cmd) { 629 case MODULE_CMD_INIT: 630 bmajor = cmajor = -1; 631 error = devsw_attach(ld_cd.cd_name, &ld_bdevsw, &bmajor, 632 &ld_cdevsw, &cmajor); 633 if (error) 634 break; 635 error = config_cfdriver_attach(&ld_cd); 636 break; 637 case MODULE_CMD_FINI: 638 error = config_cfdriver_detach(&ld_cd); 639 if (error) 640 break; 641 devsw_detach(&ld_bdevsw, &ld_cdevsw); 642 break; 643 default: 644 error = ENOTTY; 645 break; 646 } 647 #endif 648 649 return error; 650 } 651
Indexes created Thu Sep 25 08:09:54 GMT 2025