1 /*- 2 * Copyright (c) 1999-2002 Poul-Henning Kamp 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/kernel.h> 32 #include <sys/systm.h> 33 #include <sys/bio.h> 34 #include <sys/lock.h> 35 #include <sys/mutex.h> 36 #include <sys/sysctl.h> 37 #include <sys/module.h> 38 #include <sys/malloc.h> 39 #include <sys/conf.h> 40 #include <sys/vnode.h> 41 #include <sys/queue.h> 42 #include <sys/poll.h> 43 #include <sys/ctype.h> 44 #include <sys/tty.h> 45 #include <machine/stdarg.h> 46 47 static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage"); 48 49 /* Built at compile time from sys/conf/majors */ 50 extern unsigned char reserved_majors[256]; 51 52 /* 53 * This is the number of hash-buckets. Experiments with 'real-life' 54 * dev_t's show that a prime halfway between two powers of two works 55 * best. 56 */ 57 #define DEVT_HASH 83 58 59 static LIST_HEAD(, cdev) dev_hash[DEVT_HASH]; 60 61 static struct mtx devmtx; 62 static void freedev(struct cdev *dev); 63 static struct cdev *newdev(int x, int y, struct cdev *); 64 65 void 66 dev_lock(void) 67 { 68 if (!mtx_initialized(&devmtx)) 69 mtx_init(&devmtx, "cdev", NULL, MTX_DEF); 70 mtx_lock(&devmtx); 71 } 72 73 void 74 dev_unlock(void) 75 { 76 77 mtx_unlock(&devmtx); 78 } 79 80 void 81 dev_ref(struct cdev *dev) 82 { 83 84 dev_lock(); 85 dev->si_refcount++; 86 dev_unlock(); 87 } 88 89 void 90 dev_rel(struct vnode *vp) 91 { 92 struct cdev *dev; 93 int flag; 94 95 dev = vp->v_rdev; 96 mtx_assert(&devmtx, MA_NOTOWNED); 97 dev_lock(); 98 SLIST_REMOVE(&dev->si_hlist, vp, vnode, v_specnext); 99 dev->si_usecount -= vp->v_usecount; 100 vp->v_rdev = NULL; 101 dev->si_refcount--; 102 KASSERT(dev->si_refcount >= 0, 103 ("dev_rel(%s) gave negative count", devtoname(dev))); 104 flag = 0; 105 if (dev->si_devsw == NULL && dev->si_refcount == 0) { 106 LIST_REMOVE(dev, si_list); 107 flag = 1; 108 } 109 dev_unlock(); 110 if (flag) 111 freedev(dev); 112 return; 113 } 114 115 struct cdevsw * 116 dev_refthread(struct cdev *dev) 117 { 118 struct cdevsw *csw; 119 120 mtx_assert(&devmtx, MA_NOTOWNED); 121 dev_lock(); 122 csw = dev->si_devsw; 123 if (csw != NULL) 124 dev->si_threadcount++; 125 dev_unlock(); 126 return (csw); 127 } 128 129 void 130 dev_relthread(struct cdev *dev) 131 { 132 133 mtx_assert(&devmtx, MA_NOTOWNED); 134 dev_lock(); 135 dev->si_threadcount--; 136 dev_unlock(); 137 } 138 139 int 140 nullop(void) 141 { 142 143 return (0); 144 } 145 146 int 147 eopnotsupp(void) 148 { 149 150 return (EOPNOTSUPP); 151 } 152 153 static int 154 enxio(void) 155 { 156 return (ENXIO); 157 } 158 159 static int 160 enodev(void) 161 { 162 return (ENODEV); 163 } 164 165 /* Define a dead_cdevsw for use when devices leave unexpectedly. */ 166 167 #define dead_open (d_open_t *)enxio 168 #define dead_close (d_close_t *)enxio 169 #define dead_read (d_read_t *)enxio 170 #define dead_write (d_write_t *)enxio 171 #define dead_ioctl (d_ioctl_t *)enxio 172 #define dead_poll (d_poll_t *)enodev 173 #define dead_mmap (d_mmap_t *)enodev 174 175 static void 176 dead_strategy(struct bio *bp) 177 { 178 179 biofinish(bp, NULL, ENXIO); 180 } 181 182 #define dead_dump (dumper_t *)enxio 183 #define dead_kqfilter (d_kqfilter_t *)enxio 184 185 static struct cdevsw dead_cdevsw = { 186 .d_version = D_VERSION, 187 .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */ 188 .d_open = dead_open, 189 .d_close = dead_close, 190 .d_read = dead_read, 191 .d_write = dead_write, 192 .d_ioctl = dead_ioctl, 193 .d_poll = dead_poll, 194 .d_mmap = dead_mmap, 195 .d_strategy = dead_strategy, 196 .d_name = "dead", 197 .d_maj = 255, 198 .d_dump = dead_dump, 199 .d_kqfilter = dead_kqfilter 200 }; 201 202 /* Default methods if driver does not specify method */ 203 204 #define null_open (d_open_t *)nullop 205 #define null_close (d_close_t *)nullop 206 #define no_read (d_read_t *)enodev 207 #define no_write (d_write_t *)enodev 208 #define no_ioctl (d_ioctl_t *)enodev 209 #define no_mmap (d_mmap_t *)enodev 210 #define no_kqfilter (d_kqfilter_t *)enodev 211 212 static void 213 no_strategy(struct bio *bp) 214 { 215 216 biofinish(bp, NULL, ENODEV); 217 } 218 219 static int 220 no_poll(struct cdev *dev __unused, int events, struct thread *td __unused) 221 { 222 /* 223 * Return true for read/write. If the user asked for something 224 * special, return POLLNVAL, so that clients have a way of 225 * determining reliably whether or not the extended 226 * functionality is present without hard-coding knowledge 227 * of specific filesystem implementations. 228 * Stay in sync with vop_nopoll(). 229 */ 230 if (events & ~POLLSTANDARD) 231 return (POLLNVAL); 232 233 return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 234 } 235 236 #define no_dump (dumper_t *)enodev 237 238 /* 239 * struct cdev * and u_dev_t primitives 240 */ 241 242 int 243 major(struct cdev *x) 244 { 245 if (x == NULL) 246 return NODEV; 247 return((x->si_udev >> 8) & 0xff); 248 } 249 250 int 251 minor(struct cdev *x) 252 { 253 if (x == NULL) 254 return NODEV; 255 return(x->si_udev & MAXMINOR); 256 } 257 258 int 259 dev2unit(struct cdev *x) 260 { 261 262 if (x == NULL) 263 return NODEV; 264 return (minor2unit(minor(x))); 265 } 266 267 int 268 minor2unit(int _minor) 269 { 270 271 KASSERT((_minor & ~MAXMINOR) == 0, ("Illegal minor %x", _minor)); 272 return ((_minor & 0xff) | (_minor >> 8)); 273 } 274 275 int 276 unit2minor(int unit) 277 { 278 279 KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit)); 280 return ((unit & 0xff) | ((unit << 8) & ~0xffff)); 281 } 282 283 static struct cdev * 284 allocdev(void) 285 { 286 struct cdev *si; 287 288 si = malloc(sizeof *si, M_DEVT, M_USE_RESERVE | M_ZERO | M_WAITOK); 289 si->si_name = si->__si_namebuf; 290 LIST_INIT(&si->si_children); 291 return (si); 292 } 293 294 static struct cdev * 295 newdev(int x, int y, struct cdev *si) 296 { 297 struct cdev *si2; 298 dev_t udev; 299 int hash; 300 301 mtx_assert(&devmtx, MA_OWNED); 302 if (x == umajor(NODEV) && y == uminor(NODEV)) 303 panic("newdev of NODEV"); 304 udev = (x << 8) | y; 305 hash = udev % DEVT_HASH; 306 LIST_FOREACH(si2, &dev_hash[hash], si_hash) { 307 if (si2->si_udev == udev) { 308 freedev(si); 309 return (si2); 310 } 311 } 312 si->si_udev = udev; 313 LIST_INSERT_HEAD(&dev_hash[hash], si, si_hash); 314 return (si); 315 } 316 317 static void 318 freedev(struct cdev *dev) 319 { 320 321 free(dev, M_DEVT); 322 } 323 324 dev_t 325 dev2udev(struct cdev *x) 326 { 327 if (x == NULL) 328 return (NODEV); 329 return (x->si_udev); 330 } 331 332 struct cdev * 333 findcdev(dev_t udev) 334 { 335 struct cdev *si; 336 int hash; 337 338 mtx_assert(&devmtx, MA_NOTOWNED); 339 if (udev == NODEV) 340 return (NULL); 341 dev_lock(); 342 hash = udev % DEVT_HASH; 343 LIST_FOREACH(si, &dev_hash[hash], si_hash) { 344 if (si->si_udev == udev) 345 break; 346 } 347 dev_unlock(); 348 return (si); 349 } 350 351 int 352 uminor(dev_t dev) 353 { 354 return (dev & MAXMINOR); 355 } 356 357 int 358 umajor(dev_t dev) 359 { 360 return ((dev & ~MAXMINOR) >> 8); 361 } 362 363 static void 364 find_major(struct cdevsw *devsw) 365 { 366 int i; 367 368 for (i = NUMCDEVSW - 1; i > 0; i--) 369 if (reserved_majors[i] != i) 370 break; 371 KASSERT(i > 0, ("Out of major numbers (%s)", devsw->d_name)); 372 devsw->d_maj = i; 373 reserved_majors[i] = i; 374 devsw->d_flags |= D_ALLOCMAJ; 375 } 376 377 static void 378 fini_cdevsw(struct cdevsw *devsw) 379 { 380 if (devsw->d_flags & D_ALLOCMAJ) { 381 reserved_majors[devsw->d_maj] = 0; 382 devsw->d_maj = MAJOR_AUTO; 383 devsw->d_flags &= ~D_ALLOCMAJ; 384 } else if (devsw->d_maj == 0) 385 devsw->d_maj = 256; 386 devsw->d_flags &= ~D_INIT; 387 } 388 389 static void 390 prep_cdevsw(struct cdevsw *devsw) 391 { 392 393 dev_lock(); 394 395 if (devsw->d_version != D_VERSION_00) { 396 printf( 397 "WARNING: Device driver \"%s\" has wrong version %s\n", 398 devsw->d_name, "and is disabled. Recompile KLD module."); 399 devsw->d_open = dead_open; 400 devsw->d_close = dead_close; 401 devsw->d_read = dead_read; 402 devsw->d_write = dead_write; 403 devsw->d_ioctl = dead_ioctl; 404 devsw->d_poll = dead_poll; 405 devsw->d_mmap = dead_mmap; 406 devsw->d_strategy = dead_strategy; 407 devsw->d_dump = dead_dump; 408 devsw->d_kqfilter = dead_kqfilter; 409 } 410 411 if (devsw->d_flags & D_TTY) { 412 if (devsw->d_ioctl == NULL) devsw->d_ioctl = ttyioctl; 413 if (devsw->d_read == NULL) devsw->d_read = ttyread; 414 if (devsw->d_write == NULL) devsw->d_write = ttywrite; 415 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = ttykqfilter; 416 if (devsw->d_poll == NULL) devsw->d_poll = ttypoll; 417 } 418 419 if (devsw->d_open == NULL) devsw->d_open = null_open; 420 if (devsw->d_close == NULL) devsw->d_close = null_close; 421 if (devsw->d_read == NULL) devsw->d_read = no_read; 422 if (devsw->d_write == NULL) devsw->d_write = no_write; 423 if (devsw->d_ioctl == NULL) devsw->d_ioctl = no_ioctl; 424 if (devsw->d_poll == NULL) devsw->d_poll = no_poll; 425 if (devsw->d_mmap == NULL) devsw->d_mmap = no_mmap; 426 if (devsw->d_strategy == NULL) devsw->d_strategy = no_strategy; 427 if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 428 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = no_kqfilter; 429 430 LIST_INIT(&devsw->d_devs); 431 432 devsw->d_flags |= D_INIT; 433 434 if (devsw->d_maj == MAJOR_AUTO) { 435 find_major(devsw); 436 } else { 437 if (devsw->d_maj == 256) /* XXX: tty_cons.c is magic */ 438 devsw->d_maj = 0; 439 KASSERT(devsw->d_maj >= 0 && devsw->d_maj < 256, 440 ("Invalid major (%d) in make_dev", devsw->d_maj)); 441 if (reserved_majors[devsw->d_maj] != devsw->d_maj) { 442 printf("WARNING: driver \"%s\" used %s %d\n", 443 devsw->d_name, "unreserved major device number", 444 devsw->d_maj); 445 reserved_majors[devsw->d_maj] = devsw->d_maj; 446 } 447 } 448 dev_unlock(); 449 } 450 451 struct cdev * 452 make_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int perms, const char *fmt, ...) 453 { 454 struct cdev *dev; 455 va_list ap; 456 int i; 457 458 KASSERT((minornr & ~MAXMINOR) == 0, 459 ("Invalid minor (0x%x) in make_dev", minornr)); 460 461 if (!(devsw->d_flags & D_INIT)) 462 prep_cdevsw(devsw); 463 dev = allocdev(); 464 dev_lock(); 465 dev = newdev(devsw->d_maj, minornr, dev); 466 if (dev->si_flags & SI_CHEAPCLONE && 467 dev->si_flags & SI_NAMED && 468 dev->si_devsw == devsw) { 469 /* 470 * This is allowed as it removes races and generally 471 * simplifies cloning devices. 472 * XXX: still ?? 473 */ 474 dev_unlock(); 475 return (dev); 476 } 477 KASSERT(!(dev->si_flags & SI_NAMED), 478 ("make_dev() by driver %s on pre-existing device (maj=%d, min=%d, name=%s)", 479 devsw->d_name, major(dev), minor(dev), devtoname(dev))); 480 481 va_start(ap, fmt); 482 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 483 if (i > (sizeof dev->__si_namebuf - 1)) { 484 printf("WARNING: Device name truncated! (%s)\n", 485 dev->__si_namebuf); 486 } 487 va_end(ap); 488 489 dev->si_devsw = devsw; 490 dev->si_uid = uid; 491 dev->si_gid = gid; 492 dev->si_mode = perms; 493 dev->si_flags |= SI_NAMED; 494 495 LIST_INSERT_HEAD(&devsw->d_devs, dev, si_list); 496 devfs_create(dev); 497 dev_unlock(); 498 return (dev); 499 } 500 501 int 502 dev_named(struct cdev *pdev, const char *name) 503 { 504 struct cdev *cdev; 505 506 if (strcmp(devtoname(pdev), name) == 0) 507 return (1); 508 LIST_FOREACH(cdev, &pdev->si_children, si_siblings) 509 if (strcmp(devtoname(cdev), name) == 0) 510 return (1); 511 return (0); 512 } 513 514 void 515 dev_depends(struct cdev *pdev, struct cdev *cdev) 516 { 517 518 dev_lock(); 519 cdev->si_parent = pdev; 520 cdev->si_flags |= SI_CHILD; 521 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 522 dev_unlock(); 523 } 524 525 struct cdev * 526 make_dev_alias(struct cdev *pdev, const char *fmt, ...) 527 { 528 struct cdev *dev; 529 va_list ap; 530 int i; 531 532 dev = allocdev(); 533 dev_lock(); 534 dev->si_flags |= SI_ALIAS; 535 dev->si_flags |= SI_NAMED; 536 va_start(ap, fmt); 537 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 538 if (i > (sizeof dev->__si_namebuf - 1)) { 539 printf("WARNING: Device name truncated! (%s)\n", 540 dev->__si_namebuf); 541 } 542 va_end(ap); 543 544 devfs_create(dev); 545 dev_unlock(); 546 dev_depends(pdev, dev); 547 return (dev); 548 } 549 550 static void 551 idestroy_dev(struct cdev *dev) 552 { 553 struct cdevsw *csw; 554 555 KASSERT(dev->si_flags & SI_NAMED, 556 ("WARNING: Driver mistake: destroy_dev on %d/%d\n", 557 major(dev), minor(dev))); 558 559 devfs_destroy(dev); 560 561 /* Remove name marking */ 562 dev->si_flags &= ~SI_NAMED; 563 564 /* If we are a child, remove us from the parents list */ 565 if (dev->si_flags & SI_CHILD) { 566 LIST_REMOVE(dev, si_siblings); 567 dev->si_flags &= ~SI_CHILD; 568 } 569 570 /* Kill our children */ 571 while (!LIST_EMPTY(&dev->si_children)) 572 idestroy_dev(LIST_FIRST(&dev->si_children)); 573 574 /* Remove from clone list */ 575 if (dev->si_flags & SI_CLONELIST) { 576 LIST_REMOVE(dev, si_clone); 577 dev->si_flags &= ~SI_CLONELIST; 578 } 579 580 csw = dev->si_devsw; 581 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 582 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 583 printf("Purging %lu threads from %s\n", 584 dev->si_threadcount, devtoname(dev)); 585 csw->d_purge(dev); 586 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 587 } 588 if (csw != NULL && csw->d_purge != NULL) 589 printf("All threads purged from %s\n", devtoname(dev)); 590 591 dev->si_drv1 = 0; 592 dev->si_drv2 = 0; 593 bzero(&dev->__si_u, sizeof(dev->__si_u)); 594 595 if (!(dev->si_flags & SI_ALIAS)) { 596 /* Remove from cdevsw list */ 597 LIST_REMOVE(dev, si_list); 598 599 /* If cdevsw has no struct cdev *'s, clean it */ 600 if (LIST_EMPTY(&csw->d_devs)) 601 fini_cdevsw(csw); 602 603 LIST_REMOVE(dev, si_hash); 604 } 605 dev->si_flags &= ~SI_ALIAS; 606 607 if (dev->si_refcount > 0) { 608 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 609 } else { 610 freedev(dev); 611 } 612 } 613 614 void 615 destroy_dev(struct cdev *dev) 616 { 617 618 dev_lock(); 619 idestroy_dev(dev); 620 dev_unlock(); 621 } 622 623 const char * 624 devtoname(struct cdev *dev) 625 { 626 char *p; 627 struct cdevsw *csw; 628 int mynor; 629 630 if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') { 631 p = dev->si_name; 632 sprintf(p, "#%d", major(dev)); 633 p += strlen(p); 634 csw = dev_refthread(dev); 635 if (csw != NULL) { 636 sprintf(p, "(%s)", csw->d_name); 637 dev_relthread(dev); 638 } 639 p += strlen(p); 640 mynor = minor(dev); 641 if (mynor < 0 || mynor > 255) 642 sprintf(p, "/%#x", (u_int)mynor); 643 else 644 sprintf(p, "/%d", mynor); 645 } 646 return (dev->si_name); 647 } 648 649 int 650 dev_stdclone(char *name, char **namep, const char *stem, int *unit) 651 { 652 int u, i; 653 654 i = strlen(stem); 655 if (bcmp(stem, name, i) != 0) 656 return (0); 657 if (!isdigit(name[i])) 658 return (0); 659 u = 0; 660 if (name[i] == '0' && isdigit(name[i+1])) 661 return (0); 662 while (isdigit(name[i])) { 663 u *= 10; 664 u += name[i++] - '0'; 665 } 666 if (u > 0xffffff) 667 return (0); 668 *unit = u; 669 if (namep) 670 *namep = &name[i]; 671 if (name[i]) 672 return (2); 673 return (1); 674 } 675 676 /* 677 * Helper functions for cloning device drivers. 678 * 679 * The objective here is to make it unnecessary for the device drivers to 680 * use rman or similar to manage their unit number space. Due to the way 681 * we do "on-demand" devices, using rman or other "private" methods 682 * will be very tricky to lock down properly once we lock down this file. 683 * 684 * Instead we give the drivers these routines which puts the struct cdev *'s 685 * that are to be managed on their own list, and gives the driver the ability 686 * to ask for the first free unit number or a given specified unit number. 687 * 688 * In addition these routines support paired devices (pty, nmdm and similar) 689 * by respecting a number of "flag" bits in the minor number. 690 * 691 */ 692 693 struct clonedevs { 694 LIST_HEAD(,cdev) head; 695 }; 696 697 void 698 clone_setup(struct clonedevs **cdp) 699 { 700 701 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 702 LIST_INIT(&(*cdp)->head); 703 } 704 705 int 706 clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, struct cdev **dp, u_int extra) 707 { 708 struct clonedevs *cd; 709 struct cdev *dev, *ndev, *dl, *de; 710 int unit, low, u; 711 712 KASSERT(*cdp != NULL, 713 ("clone_setup() not called in driver \"%s\"", csw->d_name)); 714 KASSERT(!(extra & CLONE_UNITMASK), 715 ("Illegal extra bits (0x%x) in clone_create", extra)); 716 KASSERT(*up <= CLONE_UNITMASK, 717 ("Too high unit (0x%x) in clone_create", *up)); 718 719 if (csw->d_maj == MAJOR_AUTO) 720 find_major(csw); 721 722 /* 723 * Search the list for a lot of things in one go: 724 * A preexisting match is returned immediately. 725 * The lowest free unit number if we are passed -1, and the place 726 * in the list where we should insert that new element. 727 * The place to insert a specified unit number, if applicable 728 * the end of the list. 729 */ 730 unit = *up; 731 ndev = allocdev(); 732 dev_lock(); 733 low = extra; 734 de = dl = NULL; 735 cd = *cdp; 736 LIST_FOREACH(dev, &cd->head, si_clone) { 737 KASSERT(dev->si_flags & SI_CLONELIST, 738 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 739 u = dev2unit(dev); 740 if (u == (unit | extra)) { 741 *dp = dev; 742 freedev(ndev); 743 dev_unlock(); 744 return (0); 745 } 746 if (unit == -1 && u == low) { 747 low++; 748 de = dev; 749 continue; 750 } 751 if (u > (unit | extra)) { 752 dl = dev; 753 break; 754 } 755 } 756 if (unit == -1) 757 unit = low & CLONE_UNITMASK; 758 dev = newdev(csw->d_maj, unit2minor(unit | extra), ndev); 759 if (dev->si_flags & SI_CLONELIST) { 760 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 761 printf("unit=%d\n", unit); 762 LIST_FOREACH(dev, &cd->head, si_clone) { 763 printf("\t%p %s\n", dev, dev->si_name); 764 } 765 panic("foo"); 766 } 767 KASSERT(!(dev->si_flags & SI_CLONELIST), 768 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 769 if (dl != NULL) 770 LIST_INSERT_BEFORE(dl, dev, si_clone); 771 else if (de != NULL) 772 LIST_INSERT_AFTER(de, dev, si_clone); 773 else 774 LIST_INSERT_HEAD(&cd->head, dev, si_clone); 775 dev->si_flags |= SI_CLONELIST; 776 *up = unit; 777 dev_unlock(); 778 return (1); 779 } 780 781 /* 782 * Kill everything still on the list. The driver should already have 783 * disposed of any softc hung of the struct cdev *'s at this time. 784 */ 785 void 786 clone_cleanup(struct clonedevs **cdp) 787 { 788 struct cdev *dev, *tdev; 789 struct clonedevs *cd; 790 791 cd = *cdp; 792 if (cd == NULL) 793 return; 794 dev_lock(); 795 LIST_FOREACH_SAFE(dev, &cd->head, si_clone, tdev) { 796 KASSERT(dev->si_flags & SI_CLONELIST, 797 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 798 KASSERT(dev->si_flags & SI_NAMED, 799 ("Driver has goofed in cloning underways udev %x", dev->si_udev)); 800 idestroy_dev(dev); 801 } 802 dev_unlock(); 803 free(cd, M_DEVBUF); 804 *cdp = NULL; 805 } 806 807 /* 808 * Helper sysctl for devname(3). We're given a struct cdev * and return 809 * the name, if any, registered by the device driver. 810 */ 811 static int 812 sysctl_devname(SYSCTL_HANDLER_ARGS) 813 { 814 int error; 815 dev_t ud; 816 struct cdev *dev; 817 818 error = SYSCTL_IN(req, &ud, sizeof (ud)); 819 if (error) 820 return (error); 821 if (ud == NODEV) 822 return(EINVAL); 823 dev = findcdev(ud); 824 if (dev == NULL) 825 error = ENOENT; 826 else 827 error = SYSCTL_OUT(req, dev->si_name, strlen(dev->si_name) + 1); 828 return (error); 829 } 830 831 SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY, 832 NULL, 0, sysctl_devname, "", "devname(3) handler"); 833