kern_conf.c revision 142232
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: head/sys/kern/kern_conf.c 142232 2005-02-22 14:41:04Z phk $"); 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 47static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage"); 48 49/* Built at compile time from sys/conf/majors */ 50extern 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 59static LIST_HEAD(, cdev) dev_hash[DEVT_HASH]; 60 61static struct mtx devmtx; 62static void freedev(struct cdev *dev); 63static struct cdev *newdev(int x, int y, struct cdev *); 64 65void 66dev_lock(void) 67{ 68 if (!mtx_initialized(&devmtx)) 69 mtx_init(&devmtx, "cdev", NULL, MTX_DEF); 70 mtx_lock(&devmtx); 71} 72 73void 74dev_unlock(void) 75{ 76 77 mtx_unlock(&devmtx); 78} 79 80void 81dev_ref(struct cdev *dev) 82{ 83 84 mtx_assert(&devmtx, MA_OWNED); 85 dev->si_refcount++; 86} 87 88void 89dev_rel(struct vnode *vp) 90{ 91 struct cdev *dev; 92 int flag; 93 94 dev = vp->v_rdev; 95 mtx_assert(&devmtx, MA_NOTOWNED); 96 dev_lock(); 97 SLIST_REMOVE(&dev->si_hlist, vp, vnode, v_specnext); 98 dev->si_usecount -= vp->v_usecount; 99 vp->v_rdev = NULL; 100 dev->si_refcount--; 101 KASSERT(dev->si_refcount >= 0, 102 ("dev_rel(%s) gave negative count", devtoname(dev))); 103 flag = 0; 104 if (dev->si_devsw == NULL && dev->si_refcount == 0) { 105 LIST_REMOVE(dev, si_list); 106 flag = 1; 107 } 108 dev_unlock(); 109 if (flag) 110 freedev(dev); 111 return; 112} 113 114struct cdevsw * 115dev_refthread(struct cdev *dev) 116{ 117 struct cdevsw *csw; 118 119 mtx_assert(&devmtx, MA_NOTOWNED); 120 dev_lock(); 121 csw = dev->si_devsw; 122 if (csw != NULL) 123 dev->si_threadcount++; 124 dev_unlock(); 125 return (csw); 126} 127 128void 129dev_relthread(struct cdev *dev) 130{ 131 132 mtx_assert(&devmtx, MA_NOTOWNED); 133 dev_lock(); 134 dev->si_threadcount--; 135 dev_unlock(); 136} 137 138int 139nullop(void) 140{ 141 142 return (0); 143} 144 145int 146eopnotsupp(void) 147{ 148 149 return (EOPNOTSUPP); 150} 151 152static int 153enxio(void) 154{ 155 return (ENXIO); 156} 157 158static int 159enodev(void) 160{ 161 return (ENODEV); 162} 163 164/* Define a dead_cdevsw for use when devices leave unexpectedly. */ 165 166#define dead_open (d_open_t *)enxio 167#define dead_close (d_close_t *)enxio 168#define dead_read (d_read_t *)enxio 169#define dead_write (d_write_t *)enxio 170#define dead_ioctl (d_ioctl_t *)enxio 171#define dead_poll (d_poll_t *)enodev 172#define dead_mmap (d_mmap_t *)enodev 173 174static void 175dead_strategy(struct bio *bp) 176{ 177 178 biofinish(bp, NULL, ENXIO); 179} 180 181#define dead_dump (dumper_t *)enxio 182#define dead_kqfilter (d_kqfilter_t *)enxio 183 184static struct cdevsw dead_cdevsw = { 185 .d_version = D_VERSION, 186 .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */ 187 .d_open = dead_open, 188 .d_close = dead_close, 189 .d_read = dead_read, 190 .d_write = dead_write, 191 .d_ioctl = dead_ioctl, 192 .d_poll = dead_poll, 193 .d_mmap = dead_mmap, 194 .d_strategy = dead_strategy, 195 .d_name = "dead", 196 .d_maj = 255, 197 .d_dump = dead_dump, 198 .d_kqfilter = dead_kqfilter 199}; 200 201/* Default methods if driver does not specify method */ 202 203#define null_open (d_open_t *)nullop 204#define null_close (d_close_t *)nullop 205#define no_read (d_read_t *)enodev 206#define no_write (d_write_t *)enodev 207#define no_ioctl (d_ioctl_t *)enodev 208#define no_mmap (d_mmap_t *)enodev 209#define no_kqfilter (d_kqfilter_t *)enodev 210 211static void 212no_strategy(struct bio *bp) 213{ 214 215 biofinish(bp, NULL, ENODEV); 216} 217 218static int 219no_poll(struct cdev *dev __unused, int events, struct thread *td __unused) 220{ 221 /* 222 * Return true for read/write. If the user asked for something 223 * special, return POLLNVAL, so that clients have a way of 224 * determining reliably whether or not the extended 225 * functionality is present without hard-coding knowledge 226 * of specific filesystem implementations. 227 * Stay in sync with vop_nopoll(). 228 */ 229 if (events & ~POLLSTANDARD) 230 return (POLLNVAL); 231 232 return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 233} 234 235#define no_dump (dumper_t *)enodev 236 237/* 238 * struct cdev * and u_dev_t primitives 239 */ 240 241int 242major(struct cdev *x) 243{ 244 if (x == NULL) 245 return NODEV; 246 return((x->si_udev >> 8) & 0xff); 247} 248 249int 250minor(struct cdev *x) 251{ 252 if (x == NULL) 253 return NODEV; 254 return(x->si_udev & MAXMINOR); 255} 256 257int 258dev2unit(struct cdev *x) 259{ 260 261 if (x == NULL) 262 return NODEV; 263 return (minor2unit(minor(x))); 264} 265 266int 267minor2unit(int _minor) 268{ 269 270 KASSERT((_minor & ~MAXMINOR) == 0, ("Illegal minor %x", _minor)); 271 return ((_minor & 0xff) | (_minor >> 8)); 272} 273 274int 275unit2minor(int unit) 276{ 277 278 KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit)); 279 return ((unit & 0xff) | ((unit << 8) & ~0xffff)); 280} 281 282static struct cdev * 283allocdev(void) 284{ 285 struct cdev *si; 286 287 si = malloc(sizeof *si, M_DEVT, M_USE_RESERVE | M_ZERO | M_WAITOK); 288 si->si_name = si->__si_namebuf; 289 LIST_INIT(&si->si_children); 290 return (si); 291} 292 293static struct cdev * 294newdev(int x, int y, struct cdev *si) 295{ 296 struct cdev *si2; 297 dev_t udev; 298 int hash; 299 300 mtx_assert(&devmtx, MA_OWNED); 301 if (x == umajor(NODEV) && y == uminor(NODEV)) 302 panic("newdev of NODEV"); 303 udev = (x << 8) | y; 304 hash = udev % DEVT_HASH; 305 LIST_FOREACH(si2, &dev_hash[hash], si_hash) { 306 if (si2->si_udev == udev) { 307 freedev(si); 308 return (si2); 309 } 310 } 311 si->si_udev = udev; 312 LIST_INSERT_HEAD(&dev_hash[hash], si, si_hash); 313 return (si); 314} 315 316static void 317freedev(struct cdev *dev) 318{ 319 320 free(dev, M_DEVT); 321} 322 323dev_t 324dev2udev(struct cdev *x) 325{ 326 if (x == NULL) 327 return (NODEV); 328 return (x->si_udev); 329} 330 331struct cdev * 332findcdev(dev_t udev) 333{ 334 struct cdev *si; 335 int hash; 336 337 mtx_assert(&devmtx, MA_NOTOWNED); 338 if (udev == NODEV) 339 return (NULL); 340 dev_lock(); 341 hash = udev % DEVT_HASH; 342 LIST_FOREACH(si, &dev_hash[hash], si_hash) { 343 if (si->si_udev == udev) 344 break; 345 } 346 dev_unlock(); 347 return (si); 348} 349 350int 351uminor(dev_t dev) 352{ 353 return (dev & MAXMINOR); 354} 355 356int 357umajor(dev_t dev) 358{ 359 return ((dev & ~MAXMINOR) >> 8); 360} 361 362static void 363find_major(struct cdevsw *devsw) 364{ 365 int i; 366 367 for (i = NUMCDEVSW - 1; i > 0; i--) 368 if (reserved_majors[i] != i) 369 break; 370 KASSERT(i > 0, ("Out of major numbers (%s)", devsw->d_name)); 371 devsw->d_maj = i; 372 reserved_majors[i] = i; 373 devsw->d_flags |= D_ALLOCMAJ; 374} 375 376static void 377fini_cdevsw(struct cdevsw *devsw) 378{ 379 if (devsw->d_flags & D_ALLOCMAJ) { 380 reserved_majors[devsw->d_maj] = 0; 381 devsw->d_maj = MAJOR_AUTO; 382 devsw->d_flags &= ~D_ALLOCMAJ; 383 } else if (devsw->d_maj == 0) 384 devsw->d_maj = 256; 385 devsw->d_flags &= ~D_INIT; 386} 387 388static void 389prep_cdevsw(struct cdevsw *devsw) 390{ 391 392 dev_lock(); 393 394 if (devsw->d_version != D_VERSION_00) { 395 printf( 396 "WARNING: Device driver \"%s\" has wrong version %s\n", 397 devsw->d_name, "and is disabled. Recompile KLD module."); 398 devsw->d_open = dead_open; 399 devsw->d_close = dead_close; 400 devsw->d_read = dead_read; 401 devsw->d_write = dead_write; 402 devsw->d_ioctl = dead_ioctl; 403 devsw->d_poll = dead_poll; 404 devsw->d_mmap = dead_mmap; 405 devsw->d_strategy = dead_strategy; 406 devsw->d_dump = dead_dump; 407 devsw->d_kqfilter = dead_kqfilter; 408 } 409 410 if (devsw->d_flags & D_TTY) { 411 if (devsw->d_ioctl == NULL) devsw->d_ioctl = ttyioctl; 412 if (devsw->d_read == NULL) devsw->d_read = ttyread; 413 if (devsw->d_write == NULL) devsw->d_write = ttywrite; 414 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = ttykqfilter; 415 if (devsw->d_poll == NULL) devsw->d_poll = ttypoll; 416 } 417 418 if (devsw->d_open == NULL) devsw->d_open = null_open; 419 if (devsw->d_close == NULL) devsw->d_close = null_close; 420 if (devsw->d_read == NULL) devsw->d_read = no_read; 421 if (devsw->d_write == NULL) devsw->d_write = no_write; 422 if (devsw->d_ioctl == NULL) devsw->d_ioctl = no_ioctl; 423 if (devsw->d_poll == NULL) devsw->d_poll = no_poll; 424 if (devsw->d_mmap == NULL) devsw->d_mmap = no_mmap; 425 if (devsw->d_strategy == NULL) devsw->d_strategy = no_strategy; 426 if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 427 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = no_kqfilter; 428 429 LIST_INIT(&devsw->d_devs); 430 431 devsw->d_flags |= D_INIT; 432 433 if (devsw->d_maj == MAJOR_AUTO) { 434 find_major(devsw); 435 } else { 436 if (devsw->d_maj == 256) /* XXX: tty_cons.c is magic */ 437 devsw->d_maj = 0; 438 KASSERT(devsw->d_maj >= 0 && devsw->d_maj < 256, 439 ("Invalid major (%d) in make_dev", devsw->d_maj)); 440 if (reserved_majors[devsw->d_maj] != devsw->d_maj) { 441 printf("WARNING: driver \"%s\" used %s %d\n", 442 devsw->d_name, "unreserved major device number", 443 devsw->d_maj); 444 reserved_majors[devsw->d_maj] = devsw->d_maj; 445 } 446 } 447 dev_unlock(); 448} 449 450struct cdev * 451make_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int perms, const char *fmt, ...) 452{ 453 struct cdev *dev; 454 va_list ap; 455 int i; 456 457 KASSERT((minornr & ~MAXMINOR) == 0, 458 ("Invalid minor (0x%x) in make_dev", minornr)); 459 460 if (!(devsw->d_flags & D_INIT)) 461 prep_cdevsw(devsw); 462 dev = allocdev(); 463 dev_lock(); 464 dev = newdev(devsw->d_maj, minornr, dev); 465 if (dev->si_flags & SI_CHEAPCLONE && 466 dev->si_flags & SI_NAMED && 467 dev->si_devsw == devsw) { 468 /* 469 * This is allowed as it removes races and generally 470 * simplifies cloning devices. 471 * XXX: still ?? 472 */ 473 dev_unlock(); 474 return (dev); 475 } 476 KASSERT(!(dev->si_flags & SI_NAMED), 477 ("make_dev() by driver %s on pre-existing device (maj=%d, min=%d, name=%s)", 478 devsw->d_name, major(dev), minor(dev), devtoname(dev))); 479 480 va_start(ap, fmt); 481 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 482 if (i > (sizeof dev->__si_namebuf - 1)) { 483 printf("WARNING: Device name truncated! (%s)\n", 484 dev->__si_namebuf); 485 } 486 va_end(ap); 487 488 dev->si_devsw = devsw; 489 dev->si_uid = uid; 490 dev->si_gid = gid; 491 dev->si_mode = perms; 492 dev->si_flags |= SI_NAMED; 493 494 LIST_INSERT_HEAD(&devsw->d_devs, dev, si_list); 495 devfs_create(dev); 496 dev_unlock(); 497 return (dev); 498} 499 500int 501dev_named(struct cdev *pdev, const char *name) 502{ 503 struct cdev *cdev; 504 505 if (strcmp(devtoname(pdev), name) == 0) 506 return (1); 507 LIST_FOREACH(cdev, &pdev->si_children, si_siblings) 508 if (strcmp(devtoname(cdev), name) == 0) 509 return (1); 510 return (0); 511} 512 513void 514dev_depends(struct cdev *pdev, struct cdev *cdev) 515{ 516 517 dev_lock(); 518 cdev->si_parent = pdev; 519 cdev->si_flags |= SI_CHILD; 520 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 521 dev_unlock(); 522} 523 524struct cdev * 525make_dev_alias(struct cdev *pdev, const char *fmt, ...) 526{ 527 struct cdev *dev; 528 va_list ap; 529 int i; 530 531 dev = allocdev(); 532 dev_lock(); 533 dev->si_flags |= SI_ALIAS; 534 dev->si_flags |= SI_NAMED; 535 va_start(ap, fmt); 536 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 537 if (i > (sizeof dev->__si_namebuf - 1)) { 538 printf("WARNING: Device name truncated! (%s)\n", 539 dev->__si_namebuf); 540 } 541 va_end(ap); 542 543 devfs_create(dev); 544 dev_unlock(); 545 dev_depends(pdev, dev); 546 return (dev); 547} 548 549static void 550idestroy_dev(struct cdev *dev) 551{ 552 struct cdevsw *csw; 553 554 KASSERT(dev->si_flags & SI_NAMED, 555 ("WARNING: Driver mistake: destroy_dev on %d/%d\n", 556 major(dev), minor(dev))); 557 558 devfs_destroy(dev); 559 560 /* Remove name marking */ 561 dev->si_flags &= ~SI_NAMED; 562 563 /* If we are a child, remove us from the parents list */ 564 if (dev->si_flags & SI_CHILD) { 565 LIST_REMOVE(dev, si_siblings); 566 dev->si_flags &= ~SI_CHILD; 567 } 568 569 /* Kill our children */ 570 while (!LIST_EMPTY(&dev->si_children)) 571 idestroy_dev(LIST_FIRST(&dev->si_children)); 572 573 /* Remove from clone list */ 574 if (dev->si_flags & SI_CLONELIST) { 575 LIST_REMOVE(dev, si_clone); 576 dev->si_flags &= ~SI_CLONELIST; 577 } 578 579 csw = dev->si_devsw; 580 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 581 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 582 printf("Purging %lu threads from %s\n", 583 dev->si_threadcount, devtoname(dev)); 584 csw->d_purge(dev); 585 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 586 } 587 if (csw != NULL && csw->d_purge != NULL) 588 printf("All threads purged from %s\n", devtoname(dev)); 589 590 dev->si_drv1 = 0; 591 dev->si_drv2 = 0; 592 bzero(&dev->__si_u, sizeof(dev->__si_u)); 593 594 if (!(dev->si_flags & SI_ALIAS)) { 595 /* Remove from cdevsw list */ 596 LIST_REMOVE(dev, si_list); 597 598 /* If cdevsw has no struct cdev *'s, clean it */ 599 if (LIST_EMPTY(&csw->d_devs)) 600 fini_cdevsw(csw); 601 602 LIST_REMOVE(dev, si_hash); 603 } 604 dev->si_flags &= ~SI_ALIAS; 605 606 if (dev->si_refcount > 0) { 607 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 608 } else { 609 freedev(dev); 610 } 611} 612 613void 614destroy_dev(struct cdev *dev) 615{ 616 617 dev_lock(); 618 idestroy_dev(dev); 619 dev_unlock(); 620} 621 622const char * 623devtoname(struct cdev *dev) 624{ 625 char *p; 626 struct cdevsw *csw; 627 int mynor; 628 629 if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') { 630 p = dev->si_name; 631 sprintf(p, "#%d", major(dev)); 632 p += strlen(p); 633 csw = dev_refthread(dev); 634 if (csw != NULL) { 635 sprintf(p, "(%s)", csw->d_name); 636 dev_relthread(dev); 637 } 638 p += strlen(p); 639 mynor = minor(dev); 640 if (mynor < 0 || mynor > 255) 641 sprintf(p, "/%#x", (u_int)mynor); 642 else 643 sprintf(p, "/%d", mynor); 644 } 645 return (dev->si_name); 646} 647 648int 649dev_stdclone(char *name, char **namep, const char *stem, int *unit) 650{ 651 int u, i; 652 653 i = strlen(stem); 654 if (bcmp(stem, name, i) != 0) 655 return (0); 656 if (!isdigit(name[i])) 657 return (0); 658 u = 0; 659 if (name[i] == '0' && isdigit(name[i+1])) 660 return (0); 661 while (isdigit(name[i])) { 662 u *= 10; 663 u += name[i++] - '0'; 664 } 665 if (u > 0xffffff) 666 return (0); 667 *unit = u; 668 if (namep) 669 *namep = &name[i]; 670 if (name[i]) 671 return (2); 672 return (1); 673} 674 675/* 676 * Helper functions for cloning device drivers. 677 * 678 * The objective here is to make it unnecessary for the device drivers to 679 * use rman or similar to manage their unit number space. Due to the way 680 * we do "on-demand" devices, using rman or other "private" methods 681 * will be very tricky to lock down properly once we lock down this file. 682 * 683 * Instead we give the drivers these routines which puts the struct cdev *'s 684 * that are to be managed on their own list, and gives the driver the ability 685 * to ask for the first free unit number or a given specified unit number. 686 * 687 * In addition these routines support paired devices (pty, nmdm and similar) 688 * by respecting a number of "flag" bits in the minor number. 689 * 690 */ 691 692struct clonedevs { 693 LIST_HEAD(,cdev) head; 694}; 695 696void 697clone_setup(struct clonedevs **cdp) 698{ 699 700 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 701 LIST_INIT(&(*cdp)->head); 702} 703 704int 705clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, struct cdev **dp, u_int extra) 706{ 707 struct clonedevs *cd; 708 struct cdev *dev, *ndev, *dl, *de; 709 int unit, low, u; 710 711 KASSERT(*cdp != NULL, 712 ("clone_setup() not called in driver \"%s\"", csw->d_name)); 713 KASSERT(!(extra & CLONE_UNITMASK), 714 ("Illegal extra bits (0x%x) in clone_create", extra)); 715 KASSERT(*up <= CLONE_UNITMASK, 716 ("Too high unit (0x%x) in clone_create", *up)); 717 718 if (csw->d_maj == MAJOR_AUTO) 719 find_major(csw); 720 721 /* 722 * Search the list for a lot of things in one go: 723 * A preexisting match is returned immediately. 724 * The lowest free unit number if we are passed -1, and the place 725 * in the list where we should insert that new element. 726 * The place to insert a specified unit number, if applicable 727 * the end of the list. 728 */ 729 unit = *up; 730 ndev = allocdev(); 731 dev_lock(); 732 low = extra; 733 de = dl = NULL; 734 cd = *cdp; 735 LIST_FOREACH(dev, &cd->head, si_clone) { 736 KASSERT(dev->si_flags & SI_CLONELIST, 737 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 738 u = dev2unit(dev); 739 if (u == (unit | extra)) { 740 *dp = dev; 741 freedev(ndev); 742 dev_unlock(); 743 return (0); 744 } 745 if (unit == -1 && u == low) { 746 low++; 747 de = dev; 748 continue; 749 } 750 if (u > (unit | extra)) { 751 dl = dev; 752 break; 753 } 754 } 755 if (unit == -1) 756 unit = low & CLONE_UNITMASK; 757 dev = newdev(csw->d_maj, unit2minor(unit | extra), ndev); 758 if (dev->si_flags & SI_CLONELIST) { 759 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 760 printf("unit=%d\n", unit); 761 LIST_FOREACH(dev, &cd->head, si_clone) { 762 printf("\t%p %s\n", dev, dev->si_name); 763 } 764 panic("foo"); 765 } 766 KASSERT(!(dev->si_flags & SI_CLONELIST), 767 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 768 if (dl != NULL) 769 LIST_INSERT_BEFORE(dl, dev, si_clone); 770 else if (de != NULL) 771 LIST_INSERT_AFTER(de, dev, si_clone); 772 else 773 LIST_INSERT_HEAD(&cd->head, dev, si_clone); 774 dev->si_flags |= SI_CLONELIST; 775 *up = unit; 776 dev_unlock(); 777 return (1); 778} 779 780/* 781 * Kill everything still on the list. The driver should already have 782 * disposed of any softc hung of the struct cdev *'s at this time. 783 */ 784void 785clone_cleanup(struct clonedevs **cdp) 786{ 787 struct cdev *dev, *tdev; 788 struct clonedevs *cd; 789 790 cd = *cdp; 791 if (cd == NULL) 792 return; 793 dev_lock(); 794 LIST_FOREACH_SAFE(dev, &cd->head, si_clone, tdev) { 795 KASSERT(dev->si_flags & SI_CLONELIST, 796 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 797 KASSERT(dev->si_flags & SI_NAMED, 798 ("Driver has goofed in cloning underways udev %x", dev->si_udev)); 799 idestroy_dev(dev); 800 } 801 dev_unlock(); 802 free(cd, M_DEVBUF); 803 *cdp = NULL; 804} 805 806/* 807 * Helper sysctl for devname(3). We're given a struct cdev * and return 808 * the name, if any, registered by the device driver. 809 */ 810static int 811sysctl_devname(SYSCTL_HANDLER_ARGS) 812{ 813 int error; 814 dev_t ud; 815 struct cdev *dev; 816 817 error = SYSCTL_IN(req, &ud, sizeof (ud)); 818 if (error) 819 return (error); 820 if (ud == NODEV) 821 return(EINVAL); 822 dev = findcdev(ud); 823 if (dev == NULL) 824 error = ENOENT; 825 else 826 error = SYSCTL_OUT(req, dev->si_name, strlen(dev->si_name) + 1); 827 return (error); 828} 829 830SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY, 831 NULL, 0, sysctl_devname, "", "devname(3) handler"); 832