Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_conf.c
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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: releng/9.2/sys/kern/kern_conf.c 253359 2013-07-15 11:45:58Z mav $"); 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 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 62 static struct cdev_priv_list cdevp_free_list = 63 TAILQ_HEAD_INITIALIZER(cdevp_free_list); 64 static SLIST_HEAD(free_cdevsw, cdevsw) cdevsw_gt_post_list = 65 SLIST_HEAD_INITIALIZER(cdevsw_gt_post_list); 66 67 void 68 dev_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 */ 80 static void 81 dev_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 } 110 111 static void 112 dev_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 } 120 121 static void 122 cdevsw_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 } 128 129 void 130 dev_unlock(void) 131 { 132 133 mtx_unlock(&devmtx); 134 } 135 136 void 137 dev_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 } 145 146 void 147 dev_refl(struct cdev *dev) 148 { 149 150 mtx_assert(&devmtx, MA_OWNED); 151 dev->si_refcount++; 152 } 153 154 void 155 dev_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 } 178 179 struct cdevsw * 180 dev_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 } 203 204 struct cdevsw * 205 devvn_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 } 245 246 void 247 dev_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 } 259 260 int 261 nullop(void) 262 { 263 264 return (0); 265 } 266 267 int 268 eopnotsupp(void) 269 { 270 271 return (EOPNOTSUPP); 272 } 273 274 static int 275 enxio(void) 276 { 277 return (ENXIO); 278 } 279 280 static int 281 enodev(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 295 296 static void 297 dead_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 306 307 static struct cdevsw dead_cdevsw = { 308 .d_version = D_VERSION, 309 .d_open = dead_open, 310 .d_close = dead_close, 311 .d_read = dead_read, 312 .d_write = dead_write, 313 .d_ioctl = dead_ioctl, 314 .d_poll = dead_poll, 315 .d_mmap = dead_mmap, 316 .d_strategy = dead_strategy, 317 .d_name = "dead", 318 .d_dump = dead_dump, 319 .d_kqfilter = dead_kqfilter, 320 .d_mmap_single = dead_mmap_single 321 }; 322 323 /* Default methods if driver does not specify method */ 324 325 #define null_open (d_open_t *)nullop 326 #define null_close (d_close_t *)nullop 327 #define no_read (d_read_t *)enodev 328 #define no_write (d_write_t *)enodev 329 #define no_ioctl (d_ioctl_t *)enodev 330 #define no_mmap (d_mmap_t *)enodev 331 #define no_kqfilter (d_kqfilter_t *)enodev 332 #define no_mmap_single (d_mmap_single_t *)enodev 333 334 static void 335 no_strategy(struct bio *bp) 336 { 337 338 biofinish(bp, NULL, ENODEV); 339 } 340 341 static int 342 no_poll(struct cdev *dev __unused, int events, struct thread *td __unused) 343 { 344 345 return (poll_no_poll(events)); 346 } 347 348 #define no_dump (dumper_t *)enodev 349 350 static int 351 giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 352 { 353 struct cdevsw *dsw; 354 int ref, retval; 355 356 dsw = dev_refthread(dev, &ref); 357 if (dsw == NULL) 358 return (ENXIO); 359 mtx_lock(&Giant); 360 retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td); 361 mtx_unlock(&Giant); 362 dev_relthread(dev, ref); 363 return (retval); 364 } 365 366 static int 367 giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp) 368 { 369 struct cdevsw *dsw; 370 int ref, retval; 371 372 dsw = dev_refthread(dev, &ref); 373 if (dsw == NULL) 374 return (ENXIO); 375 mtx_lock(&Giant); 376 retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp); 377 mtx_unlock(&Giant); 378 dev_relthread(dev, ref); 379 return (retval); 380 } 381 382 static int 383 giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 384 { 385 struct cdevsw *dsw; 386 int ref, retval; 387 388 dsw = dev_refthread(dev, &ref); 389 if (dsw == NULL) 390 return (ENXIO); 391 mtx_lock(&Giant); 392 retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td); 393 mtx_unlock(&Giant); 394 dev_relthread(dev, ref); 395 return (retval); 396 } 397 398 static void 399 giant_strategy(struct bio *bp) 400 { 401 struct cdevsw *dsw; 402 struct cdev *dev; 403 int ref; 404 405 dev = bp->bio_dev; 406 dsw = dev_refthread(dev, &ref); 407 if (dsw == NULL) { 408 biofinish(bp, NULL, ENXIO); 409 return; 410 } 411 mtx_lock(&Giant); 412 dsw->d_gianttrick->d_strategy(bp); 413 mtx_unlock(&Giant); 414 dev_relthread(dev, ref); 415 } 416 417 static int 418 giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 419 { 420 struct cdevsw *dsw; 421 int ref, retval; 422 423 dsw = dev_refthread(dev, &ref); 424 if (dsw == NULL) 425 return (ENXIO); 426 mtx_lock(&Giant); 427 retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td); 428 mtx_unlock(&Giant); 429 dev_relthread(dev, ref); 430 return (retval); 431 } 432 433 static int 434 giant_read(struct cdev *dev, struct uio *uio, int ioflag) 435 { 436 struct cdevsw *dsw; 437 int ref, retval; 438 439 dsw = dev_refthread(dev, &ref); 440 if (dsw == NULL) 441 return (ENXIO); 442 mtx_lock(&Giant); 443 retval = dsw->d_gianttrick->d_read(dev, uio, ioflag); 444 mtx_unlock(&Giant); 445 dev_relthread(dev, ref); 446 return (retval); 447 } 448 449 static int 450 giant_write(struct cdev *dev, struct uio *uio, int ioflag) 451 { 452 struct cdevsw *dsw; 453 int ref, retval; 454 455 dsw = dev_refthread(dev, &ref); 456 if (dsw == NULL) 457 return (ENXIO); 458 mtx_lock(&Giant); 459 retval = dsw->d_gianttrick->d_write(dev, uio, ioflag); 460 mtx_unlock(&Giant); 461 dev_relthread(dev, ref); 462 return (retval); 463 } 464 465 static int 466 giant_poll(struct cdev *dev, int events, struct thread *td) 467 { 468 struct cdevsw *dsw; 469 int ref, retval; 470 471 dsw = dev_refthread(dev, &ref); 472 if (dsw == NULL) 473 return (ENXIO); 474 mtx_lock(&Giant); 475 retval = dsw->d_gianttrick->d_poll(dev, events, td); 476 mtx_unlock(&Giant); 477 dev_relthread(dev, ref); 478 return (retval); 479 } 480 481 static int 482 giant_kqfilter(struct cdev *dev, struct knote *kn) 483 { 484 struct cdevsw *dsw; 485 int ref, retval; 486 487 dsw = dev_refthread(dev, &ref); 488 if (dsw == NULL) 489 return (ENXIO); 490 mtx_lock(&Giant); 491 retval = dsw->d_gianttrick->d_kqfilter(dev, kn); 492 mtx_unlock(&Giant); 493 dev_relthread(dev, ref); 494 return (retval); 495 } 496 497 static int 498 giant_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot, 499 vm_memattr_t *memattr) 500 { 501 struct cdevsw *dsw; 502 int ref, retval; 503 504 dsw = dev_refthread(dev, &ref); 505 if (dsw == NULL) 506 return (ENXIO); 507 mtx_lock(&Giant); 508 retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot, 509 memattr); 510 mtx_unlock(&Giant); 511 dev_relthread(dev, ref); 512 return (retval); 513 } 514 515 static int 516 giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size, 517 vm_object_t *object, int nprot) 518 { 519 struct cdevsw *dsw; 520 int ref, retval; 521 522 dsw = dev_refthread(dev, &ref); 523 if (dsw == NULL) 524 return (ENXIO); 525 mtx_lock(&Giant); 526 retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object, 527 nprot); 528 mtx_unlock(&Giant); 529 dev_relthread(dev, ref); 530 return (retval); 531 } 532 533 static void 534 notify(struct cdev *dev, const char *ev, int flags) 535 { 536 static const char prefix[] = "cdev="; 537 char *data; 538 int namelen, mflags; 539 540 if (cold) 541 return; 542 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; 543 namelen = strlen(dev->si_name); 544 data = malloc(namelen + sizeof(prefix), M_TEMP, mflags); 545 if (data == NULL) 546 return; 547 memcpy(data, prefix, sizeof(prefix) - 1); 548 memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1); 549 devctl_notify_f("DEVFS", "CDEV", ev, data, mflags); 550 free(data, M_TEMP); 551 } 552 553 static void 554 notify_create(struct cdev *dev, int flags) 555 { 556 557 notify(dev, "CREATE", flags); 558 } 559 560 static void 561 notify_destroy(struct cdev *dev) 562 { 563 564 notify(dev, "DESTROY", MAKEDEV_WAITOK); 565 } 566 567 static struct cdev * 568 newdev(struct cdevsw *csw, int unit, struct cdev *si) 569 { 570 struct cdev *si2; 571 572 mtx_assert(&devmtx, MA_OWNED); 573 if (csw->d_flags & D_NEEDMINOR) { 574 /* We may want to return an existing device */ 575 LIST_FOREACH(si2, &csw->d_devs, si_list) { 576 if (dev2unit(si2) == unit) { 577 dev_free_devlocked(si); 578 return (si2); 579 } 580 } 581 } 582 si->si_drv0 = unit; 583 si->si_devsw = csw; 584 LIST_INSERT_HEAD(&csw->d_devs, si, si_list); 585 return (si); 586 } 587 588 static void 589 fini_cdevsw(struct cdevsw *devsw) 590 { 591 struct cdevsw *gt; 592 593 if (devsw->d_gianttrick != NULL) { 594 gt = devsw->d_gianttrick; 595 memcpy(devsw, gt, sizeof *devsw); 596 cdevsw_free_devlocked(gt); 597 devsw->d_gianttrick = NULL; 598 } 599 devsw->d_flags &= ~D_INIT; 600 } 601 602 static int 603 prep_cdevsw(struct cdevsw *devsw, int flags) 604 { 605 struct cdevsw *dsw2; 606 607 mtx_assert(&devmtx, MA_OWNED); 608 if (devsw->d_flags & D_INIT) 609 return (0); 610 if (devsw->d_flags & D_NEEDGIANT) { 611 dev_unlock(); 612 dsw2 = malloc(sizeof *dsw2, M_DEVT, 613 (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK); 614 dev_lock(); 615 if (dsw2 == NULL && !(devsw->d_flags & D_INIT)) 616 return (ENOMEM); 617 } else 618 dsw2 = NULL; 619 if (devsw->d_flags & D_INIT) { 620 if (dsw2 != NULL) 621 cdevsw_free_devlocked(dsw2); 622 return (0); 623 } 624 625 if (devsw->d_version != D_VERSION_03) { 626 printf( 627 "WARNING: Device driver \"%s\" has wrong version %s\n", 628 devsw->d_name == NULL ? "???" : devsw->d_name, 629 "and is disabled. Recompile KLD module."); 630 devsw->d_open = dead_open; 631 devsw->d_close = dead_close; 632 devsw->d_read = dead_read; 633 devsw->d_write = dead_write; 634 devsw->d_ioctl = dead_ioctl; 635 devsw->d_poll = dead_poll; 636 devsw->d_mmap = dead_mmap; 637 devsw->d_mmap_single = dead_mmap_single; 638 devsw->d_strategy = dead_strategy; 639 devsw->d_dump = dead_dump; 640 devsw->d_kqfilter = dead_kqfilter; 641 } 642 643 if (devsw->d_flags & D_NEEDGIANT) { 644 if (devsw->d_gianttrick == NULL) { 645 memcpy(dsw2, devsw, sizeof *dsw2); 646 devsw->d_gianttrick = dsw2; 647 dsw2 = NULL; 648 } 649 } 650 651 #define FIXUP(member, noop, giant) \ 652 do { \ 653 if (devsw->member == NULL) { \ 654 devsw->member = noop; \ 655 } else if (devsw->d_flags & D_NEEDGIANT) \ 656 devsw->member = giant; \ 657 } \ 658 while (0) 659 660 FIXUP(d_open, null_open, giant_open); 661 FIXUP(d_fdopen, NULL, giant_fdopen); 662 FIXUP(d_close, null_close, giant_close); 663 FIXUP(d_read, no_read, giant_read); 664 FIXUP(d_write, no_write, giant_write); 665 FIXUP(d_ioctl, no_ioctl, giant_ioctl); 666 FIXUP(d_poll, no_poll, giant_poll); 667 FIXUP(d_mmap, no_mmap, giant_mmap); 668 FIXUP(d_strategy, no_strategy, giant_strategy); 669 FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter); 670 FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single); 671 672 if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 673 674 LIST_INIT(&devsw->d_devs); 675 676 devsw->d_flags |= D_INIT; 677 678 if (dsw2 != NULL) 679 cdevsw_free_devlocked(dsw2); 680 return (0); 681 } 682 683 static int 684 prep_devname(struct cdev *dev, const char *fmt, va_list ap) 685 { 686 int len; 687 char *from, *q, *s, *to; 688 689 mtx_assert(&devmtx, MA_OWNED); 690 691 len = vsnrprintf(dev->__si_namebuf, sizeof(dev->__si_namebuf), 32, 692 fmt, ap); 693 if (len > sizeof(dev->__si_namebuf) - 1) 694 return (ENAMETOOLONG); 695 696 /* Strip leading slashes. */ 697 for (from = dev->__si_namebuf; *from == '/'; from++) 698 ; 699 700 for (to = dev->__si_namebuf; *from != '\0'; from++, to++) { 701 /* Treat multiple sequential slashes as single. */ 702 while (from[0] == '/' && from[1] == '/') 703 from++; 704 /* Trailing slash is considered invalid. */ 705 if (from[0] == '/' && from[1] == '\0') 706 return (EINVAL); 707 *to = *from; 708 } 709 *to = '\0'; 710 711 if (dev->__si_namebuf[0] == '\0') 712 return (EINVAL); 713 714 /* Disallow "." and ".." components. */ 715 for (s = dev->__si_namebuf;;) { 716 for (q = s; *q != '/' && *q != '\0'; q++) 717 ; 718 if (q - s == 1 && s[0] == '.') 719 return (EINVAL); 720 if (q - s == 2 && s[0] == '.' && s[1] == '.') 721 return (EINVAL); 722 if (*q != '/') 723 break; 724 s = q + 1; 725 } 726 727 if (devfs_dev_exists(dev->__si_namebuf) != 0) 728 return (EEXIST); 729 730 return (0); 731 } 732 733 static int 734 make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit, 735 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 736 va_list ap) 737 { 738 struct cdev *dev, *dev_new; 739 int res; 740 741 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, 742 ("make_dev_credv: both WAITOK and NOWAIT specified")); 743 dev_new = devfs_alloc(flags); 744 if (dev_new == NULL) 745 return (ENOMEM); 746 dev_lock(); 747 res = prep_cdevsw(devsw, flags); 748 if (res != 0) { 749 dev_unlock(); 750 devfs_free(dev_new); 751 return (res); 752 } 753 dev = newdev(devsw, unit, dev_new); 754 if ((dev->si_flags & SI_NAMED) == 0) { 755 res = prep_devname(dev, fmt, ap); 756 if (res != 0) { 757 if ((flags & MAKEDEV_CHECKNAME) == 0) { 758 panic( 759 "make_dev_credv: bad si_name (error=%d, si_name=%s)", 760 res, dev->si_name); 761 } 762 if (dev == dev_new) { 763 LIST_REMOVE(dev, si_list); 764 dev_unlock(); 765 devfs_free(dev); 766 } else 767 dev_unlock(); 768 return (res); 769 } 770 } 771 if (flags & MAKEDEV_REF) 772 dev_refl(dev); 773 if (flags & MAKEDEV_ETERNAL) 774 dev->si_flags |= SI_ETERNAL; 775 if (dev->si_flags & SI_CHEAPCLONE && 776 dev->si_flags & SI_NAMED) { 777 /* 778 * This is allowed as it removes races and generally 779 * simplifies cloning devices. 780 * XXX: still ?? 781 */ 782 dev_unlock_and_free(); 783 *dres = dev; 784 return (0); 785 } 786 KASSERT(!(dev->si_flags & SI_NAMED), 787 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", 788 devsw->d_name, dev2unit(dev), devtoname(dev))); 789 dev->si_flags |= SI_NAMED; 790 if (cr != NULL) 791 dev->si_cred = crhold(cr); 792 dev->si_uid = uid; 793 dev->si_gid = gid; 794 dev->si_mode = mode; 795 796 devfs_create(dev); 797 clean_unrhdrl(devfs_inos); 798 dev_unlock_and_free(); 799 800 notify_create(dev, flags); 801 802 *dres = dev; 803 return (0); 804 } 805 806 struct cdev * 807 make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode, 808 const char *fmt, ...) 809 { 810 struct cdev *dev; 811 va_list ap; 812 int res; 813 814 va_start(ap, fmt); 815 res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt, 816 ap); 817 va_end(ap); 818 KASSERT(res == 0 && dev != NULL, 819 ("make_dev: failed make_dev_credv (error=%d)", res)); 820 return (dev); 821 } 822 823 struct cdev * 824 make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid, 825 gid_t gid, int mode, const char *fmt, ...) 826 { 827 struct cdev *dev; 828 va_list ap; 829 int res; 830 831 va_start(ap, fmt); 832 res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap); 833 va_end(ap); 834 835 KASSERT(res == 0 && dev != NULL, 836 ("make_dev_cred: failed make_dev_credv (error=%d)", res)); 837 return (dev); 838 } 839 840 struct cdev * 841 make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr, 842 uid_t uid, gid_t gid, int mode, const char *fmt, ...) 843 { 844 struct cdev *dev; 845 va_list ap; 846 int res; 847 848 va_start(ap, fmt); 849 res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode, 850 fmt, ap); 851 va_end(ap); 852 853 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 854 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 855 ("make_dev_credf: failed make_dev_credv (error=%d)", res)); 856 return (res == 0 ? dev : NULL); 857 } 858 859 int 860 make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw, 861 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...) 862 { 863 va_list ap; 864 int res; 865 866 va_start(ap, fmt); 867 res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode, 868 fmt, ap); 869 va_end(ap); 870 871 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 872 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 873 ("make_dev_p: failed make_dev_credv (error=%d)", res)); 874 return (res); 875 } 876 877 static void 878 dev_dependsl(struct cdev *pdev, struct cdev *cdev) 879 { 880 881 cdev->si_parent = pdev; 882 cdev->si_flags |= SI_CHILD; 883 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 884 } 885 886 887 void 888 dev_depends(struct cdev *pdev, struct cdev *cdev) 889 { 890 891 dev_lock(); 892 dev_dependsl(pdev, cdev); 893 dev_unlock(); 894 } 895 896 static int 897 make_dev_alias_v(int flags, struct cdev **cdev, struct cdev *pdev, 898 const char *fmt, va_list ap) 899 { 900 struct cdev *dev; 901 int error; 902 903 KASSERT(pdev != NULL, ("make_dev_alias_v: pdev is NULL")); 904 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, 905 ("make_dev_alias_v: both WAITOK and NOWAIT specified")); 906 KASSERT((flags & ~(MAKEDEV_WAITOK | MAKEDEV_NOWAIT | 907 MAKEDEV_CHECKNAME)) == 0, 908 ("make_dev_alias_v: invalid flags specified (flags=%02x)", flags)); 909 910 dev = devfs_alloc(flags); 911 if (dev == NULL) 912 return (ENOMEM); 913 dev_lock(); 914 dev->si_flags |= SI_ALIAS; 915 error = prep_devname(dev, fmt, ap); 916 if (error != 0) { 917 if ((flags & MAKEDEV_CHECKNAME) == 0) { 918 panic("make_dev_alias_v: bad si_name " 919 "(error=%d, si_name=%s)", error, dev->si_name); 920 } 921 dev_unlock(); 922 devfs_free(dev); 923 return (error); 924 } 925 dev->si_flags |= SI_NAMED; 926 devfs_create(dev); 927 dev_dependsl(pdev, dev); 928 clean_unrhdrl(devfs_inos); 929 dev_unlock(); 930 931 notify_create(dev, flags); 932 *cdev = dev; 933 934 return (0); 935 } 936 937 struct cdev * 938 make_dev_alias(struct cdev *pdev, const char *fmt, ...) 939 { 940 struct cdev *dev; 941 va_list ap; 942 int res; 943 944 va_start(ap, fmt); 945 res = make_dev_alias_v(MAKEDEV_WAITOK, &dev, pdev, fmt, ap); 946 va_end(ap); 947 948 KASSERT(res == 0 && dev != NULL, 949 ("make_dev_alias: failed make_dev_alias_v (error=%d)", res)); 950 return (dev); 951 } 952 953 int 954 make_dev_alias_p(int flags, struct cdev **cdev, struct cdev *pdev, 955 const char *fmt, ...) 956 { 957 va_list ap; 958 int res; 959 960 va_start(ap, fmt); 961 res = make_dev_alias_v(flags, cdev, pdev, fmt, ap); 962 va_end(ap); 963 return (res); 964 } 965 966 int 967 make_dev_physpath_alias(int flags, struct cdev **cdev, struct cdev *pdev, 968 struct cdev *old_alias, const char *physpath) 969 { 970 char *devfspath; 971 int physpath_len; 972 int max_parentpath_len; 973 int parentpath_len; 974 int devfspathbuf_len; 975 int mflags; 976 int ret; 977 978 *cdev = NULL; 979 devfspath = NULL; 980 physpath_len = strlen(physpath); 981 ret = EINVAL; 982 if (physpath_len == 0) 983 goto out; 984 985 if (strncmp("id1,", physpath, 4) == 0) { 986 physpath += 4; 987 physpath_len -= 4; 988 if (physpath_len == 0) 989 goto out; 990 } 991 992 max_parentpath_len = SPECNAMELEN - physpath_len - /*/*/1; 993 parentpath_len = strlen(pdev->si_name); 994 if (max_parentpath_len < parentpath_len) { 995 if (bootverbose) 996 printf("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] == '' && isdigit(name[i+1])) 1141 return (0); 1142 while (isdigit(name[i])) { 1143 u *= 10; 1144 u += name[i++] - ''; 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; 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 static void 1390 devdtr_init(void *dummy __unused) 1391 { 1392 1393 TASK_INIT(&dev_dtr_task, 0, destroy_dev_tq, NULL); 1394 } 1395 1396 SYSINIT(devdtr, SI_SUB_DEVFS, SI_ORDER_SECOND, devdtr_init, NULL); 1397 1398 #include "opt_ddb.h" 1399 #ifdef DDB 1400 #include <sys/kernel.h> 1401 1402 #include <ddb/ddb.h> 1403 1404 DB_SHOW_COMMAND(cdev, db_show_cdev) 1405 { 1406 struct cdev_priv *cdp; 1407 struct cdev *dev; 1408 u_int flags; 1409 char buf[512]; 1410 1411 if (!have_addr) { 1412 TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { 1413 dev = &cdp->cdp_c; 1414 db_printf("%s %p\n", dev->si_name, dev); 1415 if (db_pager_quit) 1416 break; 1417 } 1418 return; 1419 } 1420 1421 dev = (struct cdev *)addr; 1422 cdp = cdev2priv(dev); 1423 db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n", 1424 dev->si_name, dev->si_refcount, dev->si_usecount, 1425 dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first); 1426 db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n", 1427 dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2); 1428 flags = dev->si_flags; 1429 #define SI_FLAG(flag) do { \ 1430 if (flags & (flag)) { \ 1431 if (buf[0] != '\0') \ 1432 strlcat(buf, ", ", sizeof(buf)); \ 1433 strlcat(buf, (#flag) + 3, sizeof(buf)); \ 1434 flags &= ~(flag); \ 1435 } \ 1436 } while (0) 1437 buf[0] = '\0'; 1438 SI_FLAG(SI_ETERNAL); 1439 SI_FLAG(SI_ALIAS); 1440 SI_FLAG(SI_NAMED); 1441 SI_FLAG(SI_CHEAPCLONE); 1442 SI_FLAG(SI_CHILD); 1443 SI_FLAG(SI_DEVOPEN); 1444 SI_FLAG(SI_CONSOPEN); 1445 SI_FLAG(SI_DUMPDEV); 1446 SI_FLAG(SI_CANDELETE); 1447 SI_FLAG(SI_CLONELIST); 1448 db_printf("si_flags %s\n", buf); 1449 1450 flags = cdp->cdp_flags; 1451 #define CDP_FLAG(flag) do { \ 1452 if (flags & (flag)) { \ 1453 if (buf[0] != '\0') \ 1454 strlcat(buf, ", ", sizeof(buf)); \ 1455 strlcat(buf, (#flag) + 4, sizeof(buf)); \ 1456 flags &= ~(flag); \ 1457 } \ 1458 } while (0) 1459 buf[0] = '\0'; 1460 CDP_FLAG(CDP_ACTIVE); 1461 CDP_FLAG(CDP_SCHED_DTR); 1462 db_printf("cdp_flags %s\n", buf); 1463 } 1464 #endif
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