kern_conf.c revision 227443
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 227443 2011-11-11 04:12:58Z kib $"); 29 30#include <sys/param.h> 31#include <sys/kernel.h> 32#include <sys/systm.h> 33#include <sys/bus.h> 34#include <sys/bio.h> 35#include <sys/lock.h> 36#include <sys/mutex.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/sx.h> 44#include <sys/ctype.h> 45#include <sys/ucred.h> 46#include <sys/taskqueue.h> 47#include <machine/stdarg.h> 48 49#include <fs/devfs/devfs_int.h> 50#include <vm/vm.h> 51 52static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage"); 53 54struct mtx devmtx; 55static void destroy_devl(struct cdev *dev); 56static int destroy_dev_sched_cbl(struct cdev *dev, 57 void (*cb)(void *), void *arg); 58static int make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, 59 int unit, struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 60 va_list ap); 61 62static struct cdev_priv_list cdevp_free_list = 63 TAILQ_HEAD_INITIALIZER(cdevp_free_list); 64static SLIST_HEAD(free_cdevsw, cdevsw) cdevsw_gt_post_list = 65 SLIST_HEAD_INITIALIZER(cdevsw_gt_post_list); 66 67void 68dev_lock(void) 69{ 70 71 mtx_lock(&devmtx); 72} 73 74/* 75 * Free all the memory collected while the cdev mutex was 76 * locked. Since devmtx is after the system map mutex, free() cannot 77 * be called immediately and is postponed until cdev mutex can be 78 * dropped. 79 */ 80static void 81dev_unlock_and_free(void) 82{ 83 struct cdev_priv_list cdp_free; 84 struct free_cdevsw csw_free; 85 struct cdev_priv *cdp; 86 struct cdevsw *csw; 87 88 mtx_assert(&devmtx, MA_OWNED); 89 90 /* 91 * Make the local copy of the list heads while the dev_mtx is 92 * held. Free it later. 93 */ 94 TAILQ_INIT(&cdp_free); 95 TAILQ_CONCAT(&cdp_free, &cdevp_free_list, cdp_list); 96 csw_free = cdevsw_gt_post_list; 97 SLIST_INIT(&cdevsw_gt_post_list); 98 99 mtx_unlock(&devmtx); 100 101 while ((cdp = TAILQ_FIRST(&cdp_free)) != NULL) { 102 TAILQ_REMOVE(&cdp_free, cdp, cdp_list); 103 devfs_free(&cdp->cdp_c); 104 } 105 while ((csw = SLIST_FIRST(&csw_free)) != NULL) { 106 SLIST_REMOVE_HEAD(&csw_free, d_postfree_list); 107 free(csw, M_DEVT); 108 } 109} 110 111static void 112dev_free_devlocked(struct cdev *cdev) 113{ 114 struct cdev_priv *cdp; 115 116 mtx_assert(&devmtx, MA_OWNED); 117 cdp = cdev2priv(cdev); 118 TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list); 119} 120 121static void 122cdevsw_free_devlocked(struct cdevsw *csw) 123{ 124 125 mtx_assert(&devmtx, MA_OWNED); 126 SLIST_INSERT_HEAD(&cdevsw_gt_post_list, csw, d_postfree_list); 127} 128 129void 130dev_unlock(void) 131{ 132 133 mtx_unlock(&devmtx); 134} 135 136void 137dev_ref(struct cdev *dev) 138{ 139 140 mtx_assert(&devmtx, MA_NOTOWNED); 141 mtx_lock(&devmtx); 142 dev->si_refcount++; 143 mtx_unlock(&devmtx); 144} 145 146void 147dev_refl(struct cdev *dev) 148{ 149 150 mtx_assert(&devmtx, MA_OWNED); 151 dev->si_refcount++; 152} 153 154void 155dev_rel(struct cdev *dev) 156{ 157 int flag = 0; 158 159 mtx_assert(&devmtx, MA_NOTOWNED); 160 dev_lock(); 161 dev->si_refcount--; 162 KASSERT(dev->si_refcount >= 0, 163 ("dev_rel(%s) gave negative count", devtoname(dev))); 164#if 0 165 if (dev->si_usecount == 0 && 166 (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED)) 167 ; 168 else 169#endif 170 if (dev->si_devsw == NULL && dev->si_refcount == 0) { 171 LIST_REMOVE(dev, si_list); 172 flag = 1; 173 } 174 dev_unlock(); 175 if (flag) 176 devfs_free(dev); 177} 178 179struct cdevsw * 180dev_refthread(struct cdev *dev, int *ref) 181{ 182 struct cdevsw *csw; 183 struct cdev_priv *cdp; 184 185 mtx_assert(&devmtx, MA_NOTOWNED); 186 if ((dev->si_flags & SI_ETERNAL) != 0) { 187 *ref = 0; 188 return (dev->si_devsw); 189 } 190 dev_lock(); 191 csw = dev->si_devsw; 192 if (csw != NULL) { 193 cdp = cdev2priv(dev); 194 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) 195 dev->si_threadcount++; 196 else 197 csw = NULL; 198 } 199 dev_unlock(); 200 *ref = 1; 201 return (csw); 202} 203 204struct cdevsw * 205devvn_refthread(struct vnode *vp, struct cdev **devp, int *ref) 206{ 207 struct cdevsw *csw; 208 struct cdev_priv *cdp; 209 struct cdev *dev; 210 211 mtx_assert(&devmtx, MA_NOTOWNED); 212 if ((vp->v_vflag & VV_ETERNALDEV) != 0) { 213 dev = vp->v_rdev; 214 if (dev == NULL) 215 return (NULL); 216 KASSERT((dev->si_flags & SI_ETERNAL) != 0, 217 ("Not eternal cdev")); 218 *ref = 0; 219 csw = dev->si_devsw; 220 KASSERT(csw != NULL, ("Eternal cdev is destroyed")); 221 *devp = dev; 222 return (csw); 223 } 224 225 csw = NULL; 226 dev_lock(); 227 dev = vp->v_rdev; 228 if (dev == NULL) { 229 dev_unlock(); 230 return (NULL); 231 } 232 cdp = cdev2priv(dev); 233 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) { 234 csw = dev->si_devsw; 235 if (csw != NULL) 236 dev->si_threadcount++; 237 } 238 dev_unlock(); 239 if (csw != NULL) { 240 *devp = dev; 241 *ref = 1; 242 } 243 return (csw); 244} 245 246void 247dev_relthread(struct cdev *dev, int ref) 248{ 249 250 mtx_assert(&devmtx, MA_NOTOWNED); 251 if (!ref) 252 return; 253 dev_lock(); 254 KASSERT(dev->si_threadcount > 0, 255 ("%s threadcount is wrong", dev->si_name)); 256 dev->si_threadcount--; 257 dev_unlock(); 258} 259 260int 261nullop(void) 262{ 263 264 return (0); 265} 266 267int 268eopnotsupp(void) 269{ 270 271 return (EOPNOTSUPP); 272} 273 274static int 275enxio(void) 276{ 277 return (ENXIO); 278} 279 280static int 281enodev(void) 282{ 283 return (ENODEV); 284} 285 286/* Define a dead_cdevsw for use when devices leave unexpectedly. */ 287 288#define dead_open (d_open_t *)enxio 289#define dead_close (d_close_t *)enxio 290#define dead_read (d_read_t *)enxio 291#define dead_write (d_write_t *)enxio 292#define dead_ioctl (d_ioctl_t *)enxio 293#define dead_poll (d_poll_t *)enodev 294#define dead_mmap (d_mmap_t *)enodev 295 296static void 297dead_strategy(struct bio *bp) 298{ 299 300 biofinish(bp, NULL, ENXIO); 301} 302 303#define dead_dump (dumper_t *)enxio 304#define dead_kqfilter (d_kqfilter_t *)enxio 305#define dead_mmap_single (d_mmap_single_t *)enodev 306 307static struct cdevsw dead_cdevsw = { 308 .d_version = D_VERSION, 309 .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */ 310 .d_open = dead_open, 311 .d_close = dead_close, 312 .d_read = dead_read, 313 .d_write = dead_write, 314 .d_ioctl = dead_ioctl, 315 .d_poll = dead_poll, 316 .d_mmap = dead_mmap, 317 .d_strategy = dead_strategy, 318 .d_name = "dead", 319 .d_dump = dead_dump, 320 .d_kqfilter = dead_kqfilter, 321 .d_mmap_single = dead_mmap_single 322}; 323 324/* Default methods if driver does not specify method */ 325 326#define null_open (d_open_t *)nullop 327#define null_close (d_close_t *)nullop 328#define no_read (d_read_t *)enodev 329#define no_write (d_write_t *)enodev 330#define no_ioctl (d_ioctl_t *)enodev 331#define no_mmap (d_mmap_t *)enodev 332#define no_kqfilter (d_kqfilter_t *)enodev 333#define no_mmap_single (d_mmap_single_t *)enodev 334 335static void 336no_strategy(struct bio *bp) 337{ 338 339 biofinish(bp, NULL, ENODEV); 340} 341 342static int 343no_poll(struct cdev *dev __unused, int events, struct thread *td __unused) 344{ 345 346 return (poll_no_poll(events)); 347} 348 349#define no_dump (dumper_t *)enodev 350 351static int 352giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 353{ 354 struct cdevsw *dsw; 355 int ref, retval; 356 357 dsw = dev_refthread(dev, &ref); 358 if (dsw == NULL) 359 return (ENXIO); 360 mtx_lock(&Giant); 361 retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td); 362 mtx_unlock(&Giant); 363 dev_relthread(dev, ref); 364 return (retval); 365} 366 367static int 368giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp) 369{ 370 struct cdevsw *dsw; 371 int ref, retval; 372 373 dsw = dev_refthread(dev, &ref); 374 if (dsw == NULL) 375 return (ENXIO); 376 mtx_lock(&Giant); 377 retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp); 378 mtx_unlock(&Giant); 379 dev_relthread(dev, ref); 380 return (retval); 381} 382 383static int 384giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 385{ 386 struct cdevsw *dsw; 387 int ref, retval; 388 389 dsw = dev_refthread(dev, &ref); 390 if (dsw == NULL) 391 return (ENXIO); 392 mtx_lock(&Giant); 393 retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td); 394 mtx_unlock(&Giant); 395 dev_relthread(dev, ref); 396 return (retval); 397} 398 399static void 400giant_strategy(struct bio *bp) 401{ 402 struct cdevsw *dsw; 403 struct cdev *dev; 404 int ref; 405 406 dev = bp->bio_dev; 407 dsw = dev_refthread(dev, &ref); 408 if (dsw == NULL) { 409 biofinish(bp, NULL, ENXIO); 410 return; 411 } 412 mtx_lock(&Giant); 413 dsw->d_gianttrick->d_strategy(bp); 414 mtx_unlock(&Giant); 415 dev_relthread(dev, ref); 416} 417 418static int 419giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 420{ 421 struct cdevsw *dsw; 422 int ref, retval; 423 424 dsw = dev_refthread(dev, &ref); 425 if (dsw == NULL) 426 return (ENXIO); 427 mtx_lock(&Giant); 428 retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td); 429 mtx_unlock(&Giant); 430 dev_relthread(dev, ref); 431 return (retval); 432} 433 434static int 435giant_read(struct cdev *dev, struct uio *uio, int ioflag) 436{ 437 struct cdevsw *dsw; 438 int ref, retval; 439 440 dsw = dev_refthread(dev, &ref); 441 if (dsw == NULL) 442 return (ENXIO); 443 mtx_lock(&Giant); 444 retval = dsw->d_gianttrick->d_read(dev, uio, ioflag); 445 mtx_unlock(&Giant); 446 dev_relthread(dev, ref); 447 return (retval); 448} 449 450static int 451giant_write(struct cdev *dev, struct uio *uio, int ioflag) 452{ 453 struct cdevsw *dsw; 454 int ref, retval; 455 456 dsw = dev_refthread(dev, &ref); 457 if (dsw == NULL) 458 return (ENXIO); 459 mtx_lock(&Giant); 460 retval = dsw->d_gianttrick->d_write(dev, uio, ioflag); 461 mtx_unlock(&Giant); 462 dev_relthread(dev, ref); 463 return (retval); 464} 465 466static int 467giant_poll(struct cdev *dev, int events, struct thread *td) 468{ 469 struct cdevsw *dsw; 470 int ref, retval; 471 472 dsw = dev_refthread(dev, &ref); 473 if (dsw == NULL) 474 return (ENXIO); 475 mtx_lock(&Giant); 476 retval = dsw->d_gianttrick->d_poll(dev, events, td); 477 mtx_unlock(&Giant); 478 dev_relthread(dev, ref); 479 return (retval); 480} 481 482static int 483giant_kqfilter(struct cdev *dev, struct knote *kn) 484{ 485 struct cdevsw *dsw; 486 int ref, retval; 487 488 dsw = dev_refthread(dev, &ref); 489 if (dsw == NULL) 490 return (ENXIO); 491 mtx_lock(&Giant); 492 retval = dsw->d_gianttrick->d_kqfilter(dev, kn); 493 mtx_unlock(&Giant); 494 dev_relthread(dev, ref); 495 return (retval); 496} 497 498static int 499giant_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot, 500 vm_memattr_t *memattr) 501{ 502 struct cdevsw *dsw; 503 int ref, retval; 504 505 dsw = dev_refthread(dev, &ref); 506 if (dsw == NULL) 507 return (ENXIO); 508 mtx_lock(&Giant); 509 retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot, 510 memattr); 511 mtx_unlock(&Giant); 512 dev_relthread(dev, ref); 513 return (retval); 514} 515 516static int 517giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size, 518 vm_object_t *object, int nprot) 519{ 520 struct cdevsw *dsw; 521 int ref, retval; 522 523 dsw = dev_refthread(dev, &ref); 524 if (dsw == NULL) 525 return (ENXIO); 526 mtx_lock(&Giant); 527 retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object, 528 nprot); 529 mtx_unlock(&Giant); 530 dev_relthread(dev, ref); 531 return (retval); 532} 533 534static void 535notify(struct cdev *dev, const char *ev, int flags) 536{ 537 static const char prefix[] = "cdev="; 538 char *data; 539 int namelen, mflags; 540 541 if (cold) 542 return; 543 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; 544 namelen = strlen(dev->si_name); 545 data = malloc(namelen + sizeof(prefix), M_TEMP, mflags); 546 if (data == NULL) 547 return; 548 memcpy(data, prefix, sizeof(prefix) - 1); 549 memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1); 550 devctl_notify_f("DEVFS", "CDEV", ev, data, mflags); 551 free(data, M_TEMP); 552} 553 554static void 555notify_create(struct cdev *dev, int flags) 556{ 557 558 notify(dev, "CREATE", flags); 559} 560 561static void 562notify_destroy(struct cdev *dev) 563{ 564 565 notify(dev, "DESTROY", MAKEDEV_WAITOK); 566} 567 568static struct cdev * 569newdev(struct cdevsw *csw, int unit, struct cdev *si) 570{ 571 struct cdev *si2; 572 573 mtx_assert(&devmtx, MA_OWNED); 574 if (csw->d_flags & D_NEEDMINOR) { 575 /* We may want to return an existing device */ 576 LIST_FOREACH(si2, &csw->d_devs, si_list) { 577 if (dev2unit(si2) == unit) { 578 dev_free_devlocked(si); 579 return (si2); 580 } 581 } 582 } 583 si->si_drv0 = unit; 584 si->si_devsw = csw; 585 LIST_INSERT_HEAD(&csw->d_devs, si, si_list); 586 return (si); 587} 588 589static void 590fini_cdevsw(struct cdevsw *devsw) 591{ 592 struct cdevsw *gt; 593 594 if (devsw->d_gianttrick != NULL) { 595 gt = devsw->d_gianttrick; 596 memcpy(devsw, gt, sizeof *devsw); 597 cdevsw_free_devlocked(gt); 598 devsw->d_gianttrick = NULL; 599 } 600 devsw->d_flags &= ~D_INIT; 601} 602 603static int 604prep_cdevsw(struct cdevsw *devsw, int flags) 605{ 606 struct cdevsw *dsw2; 607 608 mtx_assert(&devmtx, MA_OWNED); 609 if (devsw->d_flags & D_INIT) 610 return (0); 611 if (devsw->d_flags & D_NEEDGIANT) { 612 dev_unlock(); 613 dsw2 = malloc(sizeof *dsw2, M_DEVT, 614 (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK); 615 dev_lock(); 616 if (dsw2 == NULL && !(devsw->d_flags & D_INIT)) 617 return (ENOMEM); 618 } else 619 dsw2 = NULL; 620 if (devsw->d_flags & D_INIT) { 621 if (dsw2 != NULL) 622 cdevsw_free_devlocked(dsw2); 623 return (0); 624 } 625 626 if (devsw->d_version != D_VERSION_03) { 627 printf( 628 "WARNING: Device driver \"%s\" has wrong version %s\n", 629 devsw->d_name == NULL ? "???" : devsw->d_name, 630 "and is disabled. Recompile KLD module."); 631 devsw->d_open = dead_open; 632 devsw->d_close = dead_close; 633 devsw->d_read = dead_read; 634 devsw->d_write = dead_write; 635 devsw->d_ioctl = dead_ioctl; 636 devsw->d_poll = dead_poll; 637 devsw->d_mmap = dead_mmap; 638 devsw->d_mmap_single = dead_mmap_single; 639 devsw->d_strategy = dead_strategy; 640 devsw->d_dump = dead_dump; 641 devsw->d_kqfilter = dead_kqfilter; 642 } 643 644 if (devsw->d_flags & D_NEEDGIANT) { 645 if (devsw->d_gianttrick == NULL) { 646 memcpy(dsw2, devsw, sizeof *dsw2); 647 devsw->d_gianttrick = dsw2; 648 dsw2 = NULL; 649 } 650 } 651 652#define FIXUP(member, noop, giant) \ 653 do { \ 654 if (devsw->member == NULL) { \ 655 devsw->member = noop; \ 656 } else if (devsw->d_flags & D_NEEDGIANT) \ 657 devsw->member = giant; \ 658 } \ 659 while (0) 660 661 FIXUP(d_open, null_open, giant_open); 662 FIXUP(d_fdopen, NULL, giant_fdopen); 663 FIXUP(d_close, null_close, giant_close); 664 FIXUP(d_read, no_read, giant_read); 665 FIXUP(d_write, no_write, giant_write); 666 FIXUP(d_ioctl, no_ioctl, giant_ioctl); 667 FIXUP(d_poll, no_poll, giant_poll); 668 FIXUP(d_mmap, no_mmap, giant_mmap); 669 FIXUP(d_strategy, no_strategy, giant_strategy); 670 FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter); 671 FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single); 672 673 if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 674 675 LIST_INIT(&devsw->d_devs); 676 677 devsw->d_flags |= D_INIT; 678 679 if (dsw2 != NULL) 680 cdevsw_free_devlocked(dsw2); 681 return (0); 682} 683 684static int 685prep_devname(struct cdev *dev, const char *fmt, va_list ap) 686{ 687 int len; 688 char *from, *q, *s, *to; 689 690 mtx_assert(&devmtx, MA_OWNED); 691 692 len = vsnrprintf(dev->__si_namebuf, sizeof(dev->__si_namebuf), 32, 693 fmt, ap); 694 if (len > sizeof(dev->__si_namebuf) - 1) 695 return (ENAMETOOLONG); 696 697 /* Strip leading slashes. */ 698 for (from = dev->__si_namebuf; *from == '/'; from++) 699 ; 700 701 for (to = dev->__si_namebuf; *from != '\0'; from++, to++) { 702 /* Treat multiple sequential slashes as single. */ 703 while (from[0] == '/' && from[1] == '/') 704 from++; 705 /* Trailing slash is considered invalid. */ 706 if (from[0] == '/' && from[1] == '\0') 707 return (EINVAL); 708 *to = *from; 709 } 710 *to = '\0'; 711 712 if (dev->__si_namebuf[0] == '\0') 713 return (EINVAL); 714 715 /* Disallow "." and ".." components. */ 716 for (s = dev->__si_namebuf;;) { 717 for (q = s; *q != '/' && *q != '\0'; q++) 718 ; 719 if (q - s == 1 && s[0] == '.') 720 return (EINVAL); 721 if (q - s == 2 && s[0] == '.' && s[1] == '.') 722 return (EINVAL); 723 if (*q != '/') 724 break; 725 s = q + 1; 726 } 727 728 if (devfs_dev_exists(dev->__si_namebuf) != 0) 729 return (EEXIST); 730 731 return (0); 732} 733 734static int 735make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit, 736 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 737 va_list ap) 738{ 739 struct cdev *dev, *dev_new; 740 int res; 741 742 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, 743 ("make_dev_credv: both WAITOK and NOWAIT specified")); 744 dev_new = devfs_alloc(flags); 745 if (dev_new == NULL) 746 return (ENOMEM); 747 dev_lock(); 748 res = prep_cdevsw(devsw, flags); 749 if (res != 0) { 750 dev_unlock(); 751 devfs_free(dev_new); 752 return (res); 753 } 754 dev = newdev(devsw, unit, dev_new); 755 if ((dev->si_flags & SI_NAMED) == 0) { 756 res = prep_devname(dev, fmt, ap); 757 if (res != 0) { 758 if ((flags & MAKEDEV_CHECKNAME) == 0) { 759 panic( 760 "make_dev_credv: bad si_name (error=%d, si_name=%s)", 761 res, dev->si_name); 762 } 763 if (dev == dev_new) { 764 LIST_REMOVE(dev, si_list); 765 dev_unlock(); 766 devfs_free(dev); 767 } else 768 dev_unlock(); 769 return (res); 770 } 771 } 772 if (flags & MAKEDEV_REF) 773 dev_refl(dev); 774 if (flags & MAKEDEV_ETERNAL) 775 dev->si_flags |= SI_ETERNAL; 776 if (dev->si_flags & SI_CHEAPCLONE && 777 dev->si_flags & SI_NAMED) { 778 /* 779 * This is allowed as it removes races and generally 780 * simplifies cloning devices. 781 * XXX: still ?? 782 */ 783 dev_unlock_and_free(); 784 *dres = dev; 785 return (0); 786 } 787 KASSERT(!(dev->si_flags & SI_NAMED), 788 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", 789 devsw->d_name, dev2unit(dev), devtoname(dev))); 790 dev->si_flags |= SI_NAMED; 791 if (cr != NULL) 792 dev->si_cred = crhold(cr); 793 dev->si_uid = uid; 794 dev->si_gid = gid; 795 dev->si_mode = mode; 796 797 devfs_create(dev); 798 clean_unrhdrl(devfs_inos); 799 dev_unlock_and_free(); 800 801 notify_create(dev, flags); 802 803 *dres = dev; 804 return (0); 805} 806 807struct cdev * 808make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode, 809 const char *fmt, ...) 810{ 811 struct cdev *dev; 812 va_list ap; 813 int res; 814 815 va_start(ap, fmt); 816 res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt, 817 ap); 818 va_end(ap); 819 KASSERT(res == 0 && dev != NULL, 820 ("make_dev: failed make_dev_credv (error=%d)", res)); 821 return (dev); 822} 823 824struct cdev * 825make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid, 826 gid_t gid, int mode, const char *fmt, ...) 827{ 828 struct cdev *dev; 829 va_list ap; 830 int res; 831 832 va_start(ap, fmt); 833 res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap); 834 va_end(ap); 835 836 KASSERT(res == 0 && dev != NULL, 837 ("make_dev_cred: failed make_dev_credv (error=%d)", res)); 838 return (dev); 839} 840 841struct cdev * 842make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr, 843 uid_t uid, gid_t gid, int mode, const char *fmt, ...) 844{ 845 struct cdev *dev; 846 va_list ap; 847 int res; 848 849 va_start(ap, fmt); 850 res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode, 851 fmt, ap); 852 va_end(ap); 853 854 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 855 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 856 ("make_dev_credf: failed make_dev_credv (error=%d)", res)); 857 return (res == 0 ? dev : NULL); 858} 859 860int 861make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw, 862 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...) 863{ 864 va_list ap; 865 int res; 866 867 va_start(ap, fmt); 868 res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode, 869 fmt, ap); 870 va_end(ap); 871 872 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 873 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 874 ("make_dev_p: failed make_dev_credv (error=%d)", res)); 875 return (res); 876} 877 878static void 879dev_dependsl(struct cdev *pdev, struct cdev *cdev) 880{ 881 882 cdev->si_parent = pdev; 883 cdev->si_flags |= SI_CHILD; 884 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 885} 886 887 888void 889dev_depends(struct cdev *pdev, struct cdev *cdev) 890{ 891 892 dev_lock(); 893 dev_dependsl(pdev, cdev); 894 dev_unlock(); 895} 896 897static int 898make_dev_alias_v(int flags, struct cdev **cdev, struct cdev *pdev, 899 const char *fmt, va_list ap) 900{ 901 struct cdev *dev; 902 int error; 903 904 KASSERT(pdev != NULL, ("make_dev_alias_v: pdev is NULL")); 905 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, 906 ("make_dev_alias_v: both WAITOK and NOWAIT specified")); 907 KASSERT((flags & ~(MAKEDEV_WAITOK | MAKEDEV_NOWAIT | 908 MAKEDEV_CHECKNAME)) == 0, 909 ("make_dev_alias_v: invalid flags specified (flags=%02x)", flags)); 910 911 dev = devfs_alloc(flags); 912 if (dev == NULL) 913 return (ENOMEM); 914 dev_lock(); 915 dev->si_flags |= SI_ALIAS; 916 error = prep_devname(dev, fmt, ap); 917 if (error != 0) { 918 if ((flags & MAKEDEV_CHECKNAME) == 0) { 919 panic("make_dev_alias_v: bad si_name " 920 "(error=%d, si_name=%s)", error, dev->si_name); 921 } 922 dev_unlock(); 923 devfs_free(dev); 924 return (error); 925 } 926 dev->si_flags |= SI_NAMED; 927 devfs_create(dev); 928 dev_dependsl(pdev, dev); 929 clean_unrhdrl(devfs_inos); 930 dev_unlock(); 931 932 notify_create(dev, flags); 933 *cdev = dev; 934 935 return (0); 936} 937 938struct cdev * 939make_dev_alias(struct cdev *pdev, const char *fmt, ...) 940{ 941 struct cdev *dev; 942 va_list ap; 943 int res; 944 945 va_start(ap, fmt); 946 res = make_dev_alias_v(MAKEDEV_WAITOK, &dev, pdev, fmt, ap); 947 va_end(ap); 948 949 KASSERT(res == 0 && dev != NULL, 950 ("make_dev_alias: failed make_dev_alias_v (error=%d)", res)); 951 return (dev); 952} 953 954int 955make_dev_alias_p(int flags, struct cdev **cdev, struct cdev *pdev, 956 const char *fmt, ...) 957{ 958 va_list ap; 959 int res; 960 961 va_start(ap, fmt); 962 res = make_dev_alias_v(flags, cdev, pdev, fmt, ap); 963 va_end(ap); 964 return (res); 965} 966 967int 968make_dev_physpath_alias(int flags, struct cdev **cdev, struct cdev *pdev, 969 struct cdev *old_alias, const char *physpath) 970{ 971 char *devfspath; 972 int physpath_len; 973 int max_parentpath_len; 974 int parentpath_len; 975 int devfspathbuf_len; 976 int mflags; 977 int ret; 978 979 *cdev = NULL; 980 devfspath = NULL; 981 physpath_len = strlen(physpath); 982 ret = EINVAL; 983 if (physpath_len == 0) 984 goto out; 985 986 if (strncmp("id1,", physpath, 4) == 0) { 987 physpath += 4; 988 physpath_len -= 4; 989 if (physpath_len == 0) 990 goto out; 991 } 992 993 max_parentpath_len = SPECNAMELEN - physpath_len - /*/*/1; 994 parentpath_len = strlen(pdev->si_name); 995 if (max_parentpath_len < parentpath_len) { 996 printf("make_dev_physpath_alias: WARNING - Unable to alias %s " 997 "to %s/%s - path too long\n", 998 pdev->si_name, physpath, pdev->si_name); 999 ret = ENAMETOOLONG; 1000 goto out; 1001 } 1002 1003 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; 1004 devfspathbuf_len = physpath_len + /*/*/1 + parentpath_len + /*NUL*/1; 1005 devfspath = malloc(devfspathbuf_len, M_DEVBUF, mflags); 1006 if (devfspath == NULL) { 1007 ret = ENOMEM; 1008 goto out; 1009 } 1010 1011 sprintf(devfspath, "%s/%s", physpath, pdev->si_name); 1012 if (old_alias != NULL 1013 && strcmp(old_alias->si_name, devfspath) == 0) { 1014 /* Retain the existing alias. */ 1015 *cdev = old_alias; 1016 old_alias = NULL; 1017 ret = 0; 1018 } else { 1019 ret = make_dev_alias_p(flags, cdev, pdev, "%s", devfspath); 1020 } 1021out: 1022 if (old_alias != NULL) 1023 destroy_dev(old_alias); 1024 if (devfspath != NULL) 1025 free(devfspath, M_DEVBUF); 1026 return (ret); 1027} 1028 1029static void 1030destroy_devl(struct cdev *dev) 1031{ 1032 struct cdevsw *csw; 1033 struct cdev_privdata *p; 1034 1035 mtx_assert(&devmtx, MA_OWNED); 1036 KASSERT(dev->si_flags & SI_NAMED, 1037 ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev))); 1038 KASSERT((dev->si_flags & SI_ETERNAL) == 0, 1039 ("WARNING: Driver mistake: destroy_dev on eternal %d\n", 1040 dev2unit(dev))); 1041 1042 devfs_destroy(dev); 1043 1044 /* Remove name marking */ 1045 dev->si_flags &= ~SI_NAMED; 1046 1047 dev->si_refcount++; /* Avoid race with dev_rel() */ 1048 1049 /* If we are a child, remove us from the parents list */ 1050 if (dev->si_flags & SI_CHILD) { 1051 LIST_REMOVE(dev, si_siblings); 1052 dev->si_flags &= ~SI_CHILD; 1053 } 1054 1055 /* Kill our children */ 1056 while (!LIST_EMPTY(&dev->si_children)) 1057 destroy_devl(LIST_FIRST(&dev->si_children)); 1058 1059 /* Remove from clone list */ 1060 if (dev->si_flags & SI_CLONELIST) { 1061 LIST_REMOVE(dev, si_clone); 1062 dev->si_flags &= ~SI_CLONELIST; 1063 } 1064 1065 csw = dev->si_devsw; 1066 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 1067 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 1068 csw->d_purge(dev); 1069 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 1070 if (dev->si_threadcount) 1071 printf("Still %lu threads in %s\n", 1072 dev->si_threadcount, devtoname(dev)); 1073 } 1074 while (dev->si_threadcount != 0) { 1075 /* Use unique dummy wait ident */ 1076 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10); 1077 } 1078 1079 dev_unlock(); 1080 notify_destroy(dev); 1081 mtx_lock(&cdevpriv_mtx); 1082 while ((p = LIST_FIRST(&cdev2priv(dev)->cdp_fdpriv)) != NULL) { 1083 devfs_destroy_cdevpriv(p); 1084 mtx_lock(&cdevpriv_mtx); 1085 } 1086 mtx_unlock(&cdevpriv_mtx); 1087 dev_lock(); 1088 1089 dev->si_drv1 = 0; 1090 dev->si_drv2 = 0; 1091 bzero(&dev->__si_u, sizeof(dev->__si_u)); 1092 1093 if (!(dev->si_flags & SI_ALIAS)) { 1094 /* Remove from cdevsw list */ 1095 LIST_REMOVE(dev, si_list); 1096 1097 /* If cdevsw has no more struct cdev *'s, clean it */ 1098 if (LIST_EMPTY(&csw->d_devs)) { 1099 fini_cdevsw(csw); 1100 wakeup(&csw->d_devs); 1101 } 1102 } 1103 dev->si_flags &= ~SI_ALIAS; 1104 dev->si_refcount--; /* Avoid race with dev_rel() */ 1105 1106 if (dev->si_refcount > 0) { 1107 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 1108 } else { 1109 dev_free_devlocked(dev); 1110 } 1111} 1112 1113void 1114destroy_dev(struct cdev *dev) 1115{ 1116 1117 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev"); 1118 dev_lock(); 1119 destroy_devl(dev); 1120 dev_unlock_and_free(); 1121} 1122 1123const char * 1124devtoname(struct cdev *dev) 1125{ 1126 1127 return (dev->si_name); 1128} 1129 1130int 1131dev_stdclone(char *name, char **namep, const char *stem, int *unit) 1132{ 1133 int u, i; 1134 1135 i = strlen(stem); 1136 if (bcmp(stem, name, i) != 0) 1137 return (0); 1138 if (!isdigit(name[i])) 1139 return (0); 1140 u = 0; 1141 if (name[i] == '0' && isdigit(name[i+1])) 1142 return (0); 1143 while (isdigit(name[i])) { 1144 u *= 10; 1145 u += name[i++] - '0'; 1146 } 1147 if (u > 0xffffff) 1148 return (0); 1149 *unit = u; 1150 if (namep) 1151 *namep = &name[i]; 1152 if (name[i]) 1153 return (2); 1154 return (1); 1155} 1156 1157/* 1158 * Helper functions for cloning device drivers. 1159 * 1160 * The objective here is to make it unnecessary for the device drivers to 1161 * use rman or similar to manage their unit number space. Due to the way 1162 * we do "on-demand" devices, using rman or other "private" methods 1163 * will be very tricky to lock down properly once we lock down this file. 1164 * 1165 * Instead we give the drivers these routines which puts the struct cdev *'s 1166 * that are to be managed on their own list, and gives the driver the ability 1167 * to ask for the first free unit number or a given specified unit number. 1168 * 1169 * In addition these routines support paired devices (pty, nmdm and similar) 1170 * by respecting a number of "flag" bits in the minor number. 1171 * 1172 */ 1173 1174struct clonedevs { 1175 LIST_HEAD(,cdev) head; 1176}; 1177 1178void 1179clone_setup(struct clonedevs **cdp) 1180{ 1181 1182 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 1183 LIST_INIT(&(*cdp)->head); 1184} 1185 1186int 1187clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, 1188 struct cdev **dp, int extra) 1189{ 1190 struct clonedevs *cd; 1191 struct cdev *dev, *ndev, *dl, *de; 1192 int unit, low, u; 1193 1194 KASSERT(*cdp != NULL, 1195 ("clone_setup() not called in driver \"%s\"", csw->d_name)); 1196 KASSERT(!(extra & CLONE_UNITMASK), 1197 ("Illegal extra bits (0x%x) in clone_create", extra)); 1198 KASSERT(*up <= CLONE_UNITMASK, 1199 ("Too high unit (0x%x) in clone_create", *up)); 1200 KASSERT(csw->d_flags & D_NEEDMINOR, 1201 ("clone_create() on cdevsw without minor numbers")); 1202 1203 1204 /* 1205 * Search the list for a lot of things in one go: 1206 * A preexisting match is returned immediately. 1207 * The lowest free unit number if we are passed -1, and the place 1208 * in the list where we should insert that new element. 1209 * The place to insert a specified unit number, if applicable 1210 * the end of the list. 1211 */ 1212 unit = *up; 1213 ndev = devfs_alloc(MAKEDEV_WAITOK); 1214 dev_lock(); 1215 prep_cdevsw(csw, MAKEDEV_WAITOK); 1216 low = extra; 1217 de = dl = NULL; 1218 cd = *cdp; 1219 LIST_FOREACH(dev, &cd->head, si_clone) { 1220 KASSERT(dev->si_flags & SI_CLONELIST, 1221 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1222 u = dev2unit(dev); 1223 if (u == (unit | extra)) { 1224 *dp = dev; 1225 dev_unlock(); 1226 devfs_free(ndev); 1227 return (0); 1228 } 1229 if (unit == -1 && u == low) { 1230 low++; 1231 de = dev; 1232 continue; 1233 } else if (u < (unit | extra)) { 1234 de = dev; 1235 continue; 1236 } else if (u > (unit | extra)) { 1237 dl = dev; 1238 break; 1239 } 1240 } 1241 if (unit == -1) 1242 unit = low & CLONE_UNITMASK; 1243 dev = newdev(csw, unit | extra, ndev); 1244 if (dev->si_flags & SI_CLONELIST) { 1245 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 1246 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra); 1247 LIST_FOREACH(dev, &cd->head, si_clone) { 1248 printf("\t%p %s\n", dev, dev->si_name); 1249 } 1250 panic("foo"); 1251 } 1252 KASSERT(!(dev->si_flags & SI_CLONELIST), 1253 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 1254 if (dl != NULL) 1255 LIST_INSERT_BEFORE(dl, dev, si_clone); 1256 else if (de != NULL) 1257 LIST_INSERT_AFTER(de, dev, si_clone); 1258 else 1259 LIST_INSERT_HEAD(&cd->head, dev, si_clone); 1260 dev->si_flags |= SI_CLONELIST; 1261 *up = unit; 1262 dev_unlock_and_free(); 1263 return (1); 1264} 1265 1266/* 1267 * Kill everything still on the list. The driver should already have 1268 * disposed of any softc hung of the struct cdev *'s at this time. 1269 */ 1270void 1271clone_cleanup(struct clonedevs **cdp) 1272{ 1273 struct cdev *dev; 1274 struct cdev_priv *cp; 1275 struct clonedevs *cd; 1276 1277 cd = *cdp; 1278 if (cd == NULL) 1279 return; 1280 dev_lock(); 1281 while (!LIST_EMPTY(&cd->head)) { 1282 dev = LIST_FIRST(&cd->head); 1283 LIST_REMOVE(dev, si_clone); 1284 KASSERT(dev->si_flags & SI_CLONELIST, 1285 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1286 dev->si_flags &= ~SI_CLONELIST; 1287 cp = cdev2priv(dev); 1288 if (!(cp->cdp_flags & CDP_SCHED_DTR)) { 1289 cp->cdp_flags |= CDP_SCHED_DTR; 1290 KASSERT(dev->si_flags & SI_NAMED, 1291 ("Driver has goofed in cloning underways udev %x unit %x", dev2udev(dev), dev2unit(dev))); 1292 destroy_devl(dev); 1293 } 1294 } 1295 dev_unlock_and_free(); 1296 free(cd, M_DEVBUF); 1297 *cdp = NULL; 1298} 1299 1300static TAILQ_HEAD(, cdev_priv) dev_ddtr = 1301 TAILQ_HEAD_INITIALIZER(dev_ddtr); 1302static struct task dev_dtr_task; 1303 1304static void 1305destroy_dev_tq(void *ctx, int pending) 1306{ 1307 struct cdev_priv *cp; 1308 struct cdev *dev; 1309 void (*cb)(void *); 1310 void *cb_arg; 1311 1312 dev_lock(); 1313 while (!TAILQ_EMPTY(&dev_ddtr)) { 1314 cp = TAILQ_FIRST(&dev_ddtr); 1315 dev = &cp->cdp_c; 1316 KASSERT(cp->cdp_flags & CDP_SCHED_DTR, 1317 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp)); 1318 TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list); 1319 cb = cp->cdp_dtr_cb; 1320 cb_arg = cp->cdp_dtr_cb_arg; 1321 destroy_devl(dev); 1322 dev_unlock_and_free(); 1323 dev_rel(dev); 1324 if (cb != NULL) 1325 cb(cb_arg); 1326 dev_lock(); 1327 } 1328 dev_unlock(); 1329} 1330 1331/* 1332 * devmtx shall be locked on entry. devmtx will be unlocked after 1333 * function return. 1334 */ 1335static int 1336destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg) 1337{ 1338 struct cdev_priv *cp; 1339 1340 mtx_assert(&devmtx, MA_OWNED); 1341 cp = cdev2priv(dev); 1342 if (cp->cdp_flags & CDP_SCHED_DTR) { 1343 dev_unlock(); 1344 return (0); 1345 } 1346 dev_refl(dev); 1347 cp->cdp_flags |= CDP_SCHED_DTR; 1348 cp->cdp_dtr_cb = cb; 1349 cp->cdp_dtr_cb_arg = arg; 1350 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list); 1351 dev_unlock(); 1352 taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task); 1353 return (1); 1354} 1355 1356int 1357destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg) 1358{ 1359 1360 dev_lock(); 1361 return (destroy_dev_sched_cbl(dev, cb, arg)); 1362} 1363 1364int 1365destroy_dev_sched(struct cdev *dev) 1366{ 1367 1368 return (destroy_dev_sched_cb(dev, NULL, NULL)); 1369} 1370 1371void 1372destroy_dev_drain(struct cdevsw *csw) 1373{ 1374 1375 dev_lock(); 1376 while (!LIST_EMPTY(&csw->d_devs)) { 1377 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10); 1378 } 1379 dev_unlock(); 1380} 1381 1382void 1383drain_dev_clone_events(void) 1384{ 1385 1386 sx_xlock(&clone_drain_lock); 1387 sx_xunlock(&clone_drain_lock); 1388} 1389 1390static void 1391devdtr_init(void *dummy __unused) 1392{ 1393 1394 TASK_INIT(&dev_dtr_task, 0, destroy_dev_tq, NULL); 1395} 1396 1397SYSINIT(devdtr, SI_SUB_DEVFS, SI_ORDER_SECOND, devdtr_init, NULL); 1398 1399#include "opt_ddb.h" 1400#ifdef DDB 1401#include <sys/kernel.h> 1402 1403#include <ddb/ddb.h> 1404 1405DB_SHOW_COMMAND(cdev, db_show_cdev) 1406{ 1407 struct cdev_priv *cdp; 1408 struct cdev *dev; 1409 u_int flags; 1410 char buf[512]; 1411 1412 if (!have_addr) { 1413 TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { 1414 dev = &cdp->cdp_c; 1415 db_printf("%s %p\n", dev->si_name, dev); 1416 if (db_pager_quit) 1417 break; 1418 } 1419 return; 1420 } 1421 1422 dev = (struct cdev *)addr; 1423 cdp = cdev2priv(dev); 1424 db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n", 1425 dev->si_name, dev->si_refcount, dev->si_usecount, 1426 dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first); 1427 db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n", 1428 dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2); 1429 flags = dev->si_flags; 1430#define SI_FLAG(flag) do { \ 1431 if (flags & (flag)) { \ 1432 if (buf[0] != '\0') \ 1433 strlcat(buf, ", ", sizeof(buf)); \ 1434 strlcat(buf, (#flag) + 3, sizeof(buf)); \ 1435 flags &= ~(flag); \ 1436 } \ 1437} while (0) 1438 buf[0] = '\0'; 1439 SI_FLAG(SI_ETERNAL); 1440 SI_FLAG(SI_ALIAS); 1441 SI_FLAG(SI_NAMED); 1442 SI_FLAG(SI_CHEAPCLONE); 1443 SI_FLAG(SI_CHILD); 1444 SI_FLAG(SI_DEVOPEN); 1445 SI_FLAG(SI_CONSOPEN); 1446 SI_FLAG(SI_DUMPDEV); 1447 SI_FLAG(SI_CANDELETE); 1448 SI_FLAG(SI_CLONELIST); 1449 db_printf("si_flags %s\n", buf); 1450 1451 flags = cdp->cdp_flags; 1452#define CDP_FLAG(flag) do { \ 1453 if (flags & (flag)) { \ 1454 if (buf[0] != '\0') \ 1455 strlcat(buf, ", ", sizeof(buf)); \ 1456 strlcat(buf, (#flag) + 4, sizeof(buf)); \ 1457 flags &= ~(flag); \ 1458 } \ 1459} while (0) 1460 buf[0] = '\0'; 1461 CDP_FLAG(CDP_ACTIVE); 1462 CDP_FLAG(CDP_SCHED_DTR); 1463 db_printf("cdp_flags %s\n", buf); 1464} 1465#endif 1466