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