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/10.2/sys/kern/kern_conf.c 280579 2015-03-25 13:01:51Z hselasky $"); 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 KASSERT((cdp->cdp_flags & CDP_UNREF_DTR) == 0, 120 ("destroy_dev() was not called after delist_dev(%p)", cdev)); 121 TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list); 122 } 123 124 static void 125 cdevsw_free_devlocked(struct cdevsw *csw) 126 { 127 128 mtx_assert(&devmtx, MA_OWNED); 129 SLIST_INSERT_HEAD(&cdevsw_gt_post_list, csw, d_postfree_list); 130 } 131 132 void 133 dev_unlock(void) 134 { 135 136 mtx_unlock(&devmtx); 137 } 138 139 void 140 dev_ref(struct cdev *dev) 141 { 142 143 mtx_assert(&devmtx, MA_NOTOWNED); 144 mtx_lock(&devmtx); 145 dev->si_refcount++; 146 mtx_unlock(&devmtx); 147 } 148 149 void 150 dev_refl(struct cdev *dev) 151 { 152 153 mtx_assert(&devmtx, MA_OWNED); 154 dev->si_refcount++; 155 } 156 157 void 158 dev_rel(struct cdev *dev) 159 { 160 int flag = 0; 161 162 mtx_assert(&devmtx, MA_NOTOWNED); 163 dev_lock(); 164 dev->si_refcount--; 165 KASSERT(dev->si_refcount >= 0, 166 ("dev_rel(%s) gave negative count", devtoname(dev))); 167 #if 0 168 if (dev->si_usecount == 0 && 169 (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED)) 170 ; 171 else 172 #endif 173 if (dev->si_devsw == NULL && dev->si_refcount == 0) { 174 LIST_REMOVE(dev, si_list); 175 flag = 1; 176 } 177 dev_unlock(); 178 if (flag) 179 devfs_free(dev); 180 } 181 182 struct cdevsw * 183 dev_refthread(struct cdev *dev, int *ref) 184 { 185 struct cdevsw *csw; 186 struct cdev_priv *cdp; 187 188 mtx_assert(&devmtx, MA_NOTOWNED); 189 if ((dev->si_flags & SI_ETERNAL) != 0) { 190 *ref = 0; 191 return (dev->si_devsw); 192 } 193 dev_lock(); 194 csw = dev->si_devsw; 195 if (csw != NULL) { 196 cdp = cdev2priv(dev); 197 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) 198 atomic_add_long(&dev->si_threadcount, 1); 199 else 200 csw = NULL; 201 } 202 dev_unlock(); 203 *ref = 1; 204 return (csw); 205 } 206 207 struct cdevsw * 208 devvn_refthread(struct vnode *vp, struct cdev **devp, int *ref) 209 { 210 struct cdevsw *csw; 211 struct cdev_priv *cdp; 212 struct cdev *dev; 213 214 mtx_assert(&devmtx, MA_NOTOWNED); 215 if ((vp->v_vflag & VV_ETERNALDEV) != 0) { 216 dev = vp->v_rdev; 217 if (dev == NULL) 218 return (NULL); 219 KASSERT((dev->si_flags & SI_ETERNAL) != 0, 220 ("Not eternal cdev")); 221 *ref = 0; 222 csw = dev->si_devsw; 223 KASSERT(csw != NULL, ("Eternal cdev is destroyed")); 224 *devp = dev; 225 return (csw); 226 } 227 228 csw = NULL; 229 dev_lock(); 230 dev = vp->v_rdev; 231 if (dev == NULL) { 232 dev_unlock(); 233 return (NULL); 234 } 235 cdp = cdev2priv(dev); 236 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) { 237 csw = dev->si_devsw; 238 if (csw != NULL) 239 atomic_add_long(&dev->si_threadcount, 1); 240 } 241 dev_unlock(); 242 if (csw != NULL) { 243 *devp = dev; 244 *ref = 1; 245 } 246 return (csw); 247 } 248 249 void 250 dev_relthread(struct cdev *dev, int ref) 251 { 252 253 mtx_assert(&devmtx, MA_NOTOWNED); 254 if (!ref) 255 return; 256 KASSERT(dev->si_threadcount > 0, 257 ("%s threadcount is wrong", dev->si_name)); 258 atomic_subtract_rel_long(&dev->si_threadcount, 1); 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_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 334 335 static void 336 no_strategy(struct bio *bp) 337 { 338 339 biofinish(bp, NULL, ENODEV); 340 } 341 342 static int 343 no_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 350 351 static int 352 giant_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 } 366 367 static int 368 giant_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 } 382 383 static int 384 giant_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 } 398 399 static void 400 giant_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 } 417 418 static int 419 giant_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 } 433 434 static int 435 giant_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 } 449 450 static int 451 giant_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 } 465 466 static int 467 giant_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 } 481 482 static int 483 giant_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 } 497 498 static int 499 giant_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 } 515 516 static int 517 giant_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 } 533 534 static void 535 notify(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 } 553 554 static void 555 notify_create(struct cdev *dev, int flags) 556 { 557 558 notify(dev, "CREATE", flags); 559 } 560 561 static void 562 notify_destroy(struct cdev *dev) 563 { 564 565 notify(dev, "DESTROY", MAKEDEV_WAITOK); 566 } 567 568 static struct cdev * 569 newdev(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 } 588 589 static void 590 fini_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 } 602 603 static int 604 prep_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 } 683 684 static int 685 prep_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_name, sizeof(dev->si_name), 32, fmt, ap); 693 if (len > sizeof(dev->si_name) - 1) 694 return (ENAMETOOLONG); 695 696 /* Strip leading slashes. */ 697 for (from = dev->si_name; *from == '/'; from++) 698 ; 699 700 for (to = dev->si_name; *from != '\0'; from++, to++) { 701 /* 702 * Spaces and double quotation marks cause 703 * problems for the devctl(4) protocol. 704 * Reject names containing those characters. 705 */ 706 if (isspace(*from) || *from == '"') 707 return (EINVAL); 708 /* Treat multiple sequential slashes as single. */ 709 while (from[0] == '/' && from[1] == '/') 710 from++; 711 /* Trailing slash is considered invalid. */ 712 if (from[0] == '/' && from[1] == '\0') 713 return (EINVAL); 714 *to = *from; 715 } 716 *to = '\0'; 717 718 if (dev->si_name[0] == '\0') 719 return (EINVAL); 720 721 /* Disallow "." and ".." components. */ 722 for (s = dev->si_name;;) { 723 for (q = s; *q != '/' && *q != '\0'; q++) 724 ; 725 if (q - s == 1 && s[0] == '.') 726 return (EINVAL); 727 if (q - s == 2 && s[0] == '.' && s[1] == '.') 728 return (EINVAL); 729 if (*q != '/') 730 break; 731 s = q + 1; 732 } 733 734 if (devfs_dev_exists(dev->si_name) != 0) 735 return (EEXIST); 736 737 return (0); 738 } 739 740 static int 741 make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit, 742 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 743 va_list ap) 744 { 745 struct cdev *dev, *dev_new; 746 int res; 747 748 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, 749 ("make_dev_credv: both WAITOK and NOWAIT specified")); 750 dev_new = devfs_alloc(flags); 751 if (dev_new == NULL) 752 return (ENOMEM); 753 dev_lock(); 754 res = prep_cdevsw(devsw, flags); 755 if (res != 0) { 756 dev_unlock(); 757 devfs_free(dev_new); 758 return (res); 759 } 760 dev = newdev(devsw, unit, dev_new); 761 if ((dev->si_flags & SI_NAMED) == 0) { 762 res = prep_devname(dev, fmt, ap); 763 if (res != 0) { 764 if ((flags & MAKEDEV_CHECKNAME) == 0) { 765 panic( 766 "make_dev_credv: bad si_name (error=%d, si_name=%s)", 767 res, dev->si_name); 768 } 769 if (dev == dev_new) { 770 LIST_REMOVE(dev, si_list); 771 dev_unlock(); 772 devfs_free(dev); 773 } else 774 dev_unlock(); 775 return (res); 776 } 777 } 778 if (flags & MAKEDEV_REF) 779 dev_refl(dev); 780 if (flags & MAKEDEV_ETERNAL) 781 dev->si_flags |= SI_ETERNAL; 782 if (dev->si_flags & SI_CHEAPCLONE && 783 dev->si_flags & SI_NAMED) { 784 /* 785 * This is allowed as it removes races and generally 786 * simplifies cloning devices. 787 * XXX: still ?? 788 */ 789 dev_unlock_and_free(); 790 *dres = dev; 791 return (0); 792 } 793 KASSERT(!(dev->si_flags & SI_NAMED), 794 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", 795 devsw->d_name, dev2unit(dev), devtoname(dev))); 796 dev->si_flags |= SI_NAMED; 797 if (cr != NULL) 798 dev->si_cred = crhold(cr); 799 dev->si_uid = uid; 800 dev->si_gid = gid; 801 dev->si_mode = mode; 802 803 devfs_create(dev); 804 clean_unrhdrl(devfs_inos); 805 dev_unlock_and_free(); 806 807 notify_create(dev, flags); 808 809 *dres = dev; 810 return (0); 811 } 812 813 struct cdev * 814 make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode, 815 const char *fmt, ...) 816 { 817 struct cdev *dev; 818 va_list ap; 819 int res; 820 821 va_start(ap, fmt); 822 res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt, 823 ap); 824 va_end(ap); 825 KASSERT(res == 0 && dev != NULL, 826 ("make_dev: failed make_dev_credv (error=%d)", res)); 827 return (dev); 828 } 829 830 struct cdev * 831 make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid, 832 gid_t gid, int mode, const char *fmt, ...) 833 { 834 struct cdev *dev; 835 va_list ap; 836 int res; 837 838 va_start(ap, fmt); 839 res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap); 840 va_end(ap); 841 842 KASSERT(res == 0 && dev != NULL, 843 ("make_dev_cred: failed make_dev_credv (error=%d)", res)); 844 return (dev); 845 } 846 847 struct cdev * 848 make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr, 849 uid_t uid, gid_t gid, int mode, const char *fmt, ...) 850 { 851 struct cdev *dev; 852 va_list ap; 853 int res; 854 855 va_start(ap, fmt); 856 res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode, 857 fmt, ap); 858 va_end(ap); 859 860 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 861 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 862 ("make_dev_credf: failed make_dev_credv (error=%d)", res)); 863 return (res == 0 ? dev : NULL); 864 } 865 866 int 867 make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw, 868 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...) 869 { 870 va_list ap; 871 int res; 872 873 va_start(ap, fmt); 874 res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode, 875 fmt, ap); 876 va_end(ap); 877 878 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 879 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 880 ("make_dev_p: failed make_dev_credv (error=%d)", res)); 881 return (res); 882 } 883 884 static void 885 dev_dependsl(struct cdev *pdev, struct cdev *cdev) 886 { 887 888 cdev->si_parent = pdev; 889 cdev->si_flags |= SI_CHILD; 890 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 891 } 892 893 894 void 895 dev_depends(struct cdev *pdev, struct cdev *cdev) 896 { 897 898 dev_lock(); 899 dev_dependsl(pdev, cdev); 900 dev_unlock(); 901 } 902 903 static int 904 make_dev_alias_v(int flags, struct cdev **cdev, struct cdev *pdev, 905 const char *fmt, va_list ap) 906 { 907 struct cdev *dev; 908 int error; 909 910 KASSERT(pdev != NULL, ("make_dev_alias_v: pdev is NULL")); 911 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, 912 ("make_dev_alias_v: both WAITOK and NOWAIT specified")); 913 KASSERT((flags & ~(MAKEDEV_WAITOK | MAKEDEV_NOWAIT | 914 MAKEDEV_CHECKNAME)) == 0, 915 ("make_dev_alias_v: invalid flags specified (flags=%02x)", flags)); 916 917 dev = devfs_alloc(flags); 918 if (dev == NULL) 919 return (ENOMEM); 920 dev_lock(); 921 dev->si_flags |= SI_ALIAS; 922 error = prep_devname(dev, fmt, ap); 923 if (error != 0) { 924 if ((flags & MAKEDEV_CHECKNAME) == 0) { 925 panic("make_dev_alias_v: bad si_name " 926 "(error=%d, si_name=%s)", error, dev->si_name); 927 } 928 dev_unlock(); 929 devfs_free(dev); 930 return (error); 931 } 932 dev->si_flags |= SI_NAMED; 933 devfs_create(dev); 934 dev_dependsl(pdev, dev); 935 clean_unrhdrl(devfs_inos); 936 dev_unlock(); 937 938 notify_create(dev, flags); 939 *cdev = dev; 940 941 return (0); 942 } 943 944 struct cdev * 945 make_dev_alias(struct cdev *pdev, const char *fmt, ...) 946 { 947 struct cdev *dev; 948 va_list ap; 949 int res; 950 951 va_start(ap, fmt); 952 res = make_dev_alias_v(MAKEDEV_WAITOK, &dev, pdev, fmt, ap); 953 va_end(ap); 954 955 KASSERT(res == 0 && dev != NULL, 956 ("make_dev_alias: failed make_dev_alias_v (error=%d)", res)); 957 return (dev); 958 } 959 960 int 961 make_dev_alias_p(int flags, struct cdev **cdev, struct cdev *pdev, 962 const char *fmt, ...) 963 { 964 va_list ap; 965 int res; 966 967 va_start(ap, fmt); 968 res = make_dev_alias_v(flags, cdev, pdev, fmt, ap); 969 va_end(ap); 970 return (res); 971 } 972 973 int 974 make_dev_physpath_alias(int flags, struct cdev **cdev, struct cdev *pdev, 975 struct cdev *old_alias, const char *physpath) 976 { 977 char *devfspath; 978 int physpath_len; 979 int max_parentpath_len; 980 int parentpath_len; 981 int devfspathbuf_len; 982 int mflags; 983 int ret; 984 985 *cdev = NULL; 986 devfspath = NULL; 987 physpath_len = strlen(physpath); 988 ret = EINVAL; 989 if (physpath_len == 0) 990 goto out; 991 992 if (strncmp("id1,", physpath, 4) == 0) { 993 physpath += 4; 994 physpath_len -= 4; 995 if (physpath_len == 0) 996 goto out; 997 } 998 999 max_parentpath_len = SPECNAMELEN - physpath_len - /*/*/1; 1000 parentpath_len = strlen(pdev->si_name); 1001 if (max_parentpath_len < parentpath_len) { 1002 if (bootverbose) 1003 printf("WARNING: Unable to alias %s " 1004 "to %s/%s - path too long\n", 1005 pdev->si_name, physpath, pdev->si_name); 1006 ret = ENAMETOOLONG; 1007 goto out; 1008 } 1009 1010 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; 1011 devfspathbuf_len = physpath_len + /*/*/1 + parentpath_len + /*NUL*/1; 1012 devfspath = malloc(devfspathbuf_len, M_DEVBUF, mflags); 1013 if (devfspath == NULL) { 1014 ret = ENOMEM; 1015 goto out; 1016 } 1017 1018 sprintf(devfspath, "%s/%s", physpath, pdev->si_name); 1019 if (old_alias != NULL && strcmp(old_alias->si_name, devfspath) == 0) { 1020 /* Retain the existing alias. */ 1021 *cdev = old_alias; 1022 old_alias = NULL; 1023 ret = 0; 1024 } else { 1025 ret = make_dev_alias_p(flags, cdev, pdev, "%s", devfspath); 1026 } 1027 out: 1028 if (old_alias != NULL) 1029 destroy_dev(old_alias); 1030 if (devfspath != NULL) 1031 free(devfspath, M_DEVBUF); 1032 return (ret); 1033 } 1034 1035 static void 1036 destroy_devl(struct cdev *dev) 1037 { 1038 struct cdevsw *csw; 1039 struct cdev_privdata *p; 1040 struct cdev_priv *cdp; 1041 1042 mtx_assert(&devmtx, MA_OWNED); 1043 KASSERT(dev->si_flags & SI_NAMED, 1044 ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev))); 1045 KASSERT((dev->si_flags & SI_ETERNAL) == 0, 1046 ("WARNING: Driver mistake: destroy_dev on eternal %d\n", 1047 dev2unit(dev))); 1048 1049 cdp = cdev2priv(dev); 1050 if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) { 1051 /* 1052 * Avoid race with dev_rel(), e.g. from the populate 1053 * loop. If CDP_UNREF_DTR flag is set, the reference 1054 * to be dropped at the end of destroy_devl() was 1055 * already taken by delist_dev_locked(). 1056 */ 1057 dev_refl(dev); 1058 1059 devfs_destroy(dev); 1060 } 1061 1062 /* Remove name marking */ 1063 dev->si_flags &= ~SI_NAMED; 1064 1065 /* If we are a child, remove us from the parents list */ 1066 if (dev->si_flags & SI_CHILD) { 1067 LIST_REMOVE(dev, si_siblings); 1068 dev->si_flags &= ~SI_CHILD; 1069 } 1070 1071 /* Kill our children */ 1072 while (!LIST_EMPTY(&dev->si_children)) 1073 destroy_devl(LIST_FIRST(&dev->si_children)); 1074 1075 /* Remove from clone list */ 1076 if (dev->si_flags & SI_CLONELIST) { 1077 LIST_REMOVE(dev, si_clone); 1078 dev->si_flags &= ~SI_CLONELIST; 1079 } 1080 1081 csw = dev->si_devsw; 1082 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 1083 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 1084 csw->d_purge(dev); 1085 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 1086 if (dev->si_threadcount) 1087 printf("Still %lu threads in %s\n", 1088 dev->si_threadcount, devtoname(dev)); 1089 } 1090 while (dev->si_threadcount != 0) { 1091 /* Use unique dummy wait ident */ 1092 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10); 1093 } 1094 1095 dev_unlock(); 1096 if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) { 1097 /* avoid out of order notify events */ 1098 notify_destroy(dev); 1099 } 1100 mtx_lock(&cdevpriv_mtx); 1101 while ((p = LIST_FIRST(&cdp->cdp_fdpriv)) != NULL) { 1102 devfs_destroy_cdevpriv(p); 1103 mtx_lock(&cdevpriv_mtx); 1104 } 1105 mtx_unlock(&cdevpriv_mtx); 1106 dev_lock(); 1107 1108 dev->si_drv1 = 0; 1109 dev->si_drv2 = 0; 1110 bzero(&dev->__si_u, sizeof(dev->__si_u)); 1111 1112 if (!(dev->si_flags & SI_ALIAS)) { 1113 /* Remove from cdevsw list */ 1114 LIST_REMOVE(dev, si_list); 1115 1116 /* If cdevsw has no more struct cdev *'s, clean it */ 1117 if (LIST_EMPTY(&csw->d_devs)) { 1118 fini_cdevsw(csw); 1119 wakeup(&csw->d_devs); 1120 } 1121 } 1122 dev->si_flags &= ~SI_ALIAS; 1123 cdp->cdp_flags &= ~CDP_UNREF_DTR; 1124 dev->si_refcount--; 1125 1126 if (dev->si_refcount > 0) 1127 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 1128 else 1129 dev_free_devlocked(dev); 1130 } 1131 1132 static void 1133 delist_dev_locked(struct cdev *dev) 1134 { 1135 struct cdev_priv *cdp; 1136 struct cdev *child; 1137 1138 mtx_assert(&devmtx, MA_OWNED); 1139 cdp = cdev2priv(dev); 1140 if ((cdp->cdp_flags & CDP_UNREF_DTR) != 0) 1141 return; 1142 cdp->cdp_flags |= CDP_UNREF_DTR; 1143 dev_refl(dev); 1144 devfs_destroy(dev); 1145 LIST_FOREACH(child, &dev->si_children, si_siblings) 1146 delist_dev_locked(child); 1147 dev_unlock(); 1148 /* ensure the destroy event is queued in order */ 1149 notify_destroy(dev); 1150 dev_lock(); 1151 } 1152 1153 /* 1154 * This function will delist a character device and its children from 1155 * the directory listing and create a destroy event without waiting 1156 * for all character device references to go away. At some later point 1157 * destroy_dev() must be called to complete the character device 1158 * destruction. After calling this function the character device name 1159 * can instantly be re-used. 1160 */ 1161 void 1162 delist_dev(struct cdev *dev) 1163 { 1164 1165 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "delist_dev"); 1166 dev_lock(); 1167 delist_dev_locked(dev); 1168 dev_unlock(); 1169 } 1170 1171 void 1172 destroy_dev(struct cdev *dev) 1173 { 1174 1175 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev"); 1176 dev_lock(); 1177 destroy_devl(dev); 1178 dev_unlock_and_free(); 1179 } 1180 1181 const char * 1182 devtoname(struct cdev *dev) 1183 { 1184 1185 return (dev->si_name); 1186 } 1187 1188 int 1189 dev_stdclone(char *name, char **namep, const char *stem, int *unit) 1190 { 1191 int u, i; 1192 1193 i = strlen(stem); 1194 if (bcmp(stem, name, i) != 0) 1195 return (0); 1196 if (!isdigit(name[i])) 1197 return (0); 1198 u = 0; 1199 if (name[i] == '' && isdigit(name[i+1])) 1200 return (0); 1201 while (isdigit(name[i])) { 1202 u *= 10; 1203 u += name[i++] - ''; 1204 } 1205 if (u > 0xffffff) 1206 return (0); 1207 *unit = u; 1208 if (namep) 1209 *namep = &name[i]; 1210 if (name[i]) 1211 return (2); 1212 return (1); 1213 } 1214 1215 /* 1216 * Helper functions for cloning device drivers. 1217 * 1218 * The objective here is to make it unnecessary for the device drivers to 1219 * use rman or similar to manage their unit number space. Due to the way 1220 * we do "on-demand" devices, using rman or other "private" methods 1221 * will be very tricky to lock down properly once we lock down this file. 1222 * 1223 * Instead we give the drivers these routines which puts the struct cdev *'s 1224 * that are to be managed on their own list, and gives the driver the ability 1225 * to ask for the first free unit number or a given specified unit number. 1226 * 1227 * In addition these routines support paired devices (pty, nmdm and similar) 1228 * by respecting a number of "flag" bits in the minor number. 1229 * 1230 */ 1231 1232 struct clonedevs { 1233 LIST_HEAD(,cdev) head; 1234 }; 1235 1236 void 1237 clone_setup(struct clonedevs **cdp) 1238 { 1239 1240 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 1241 LIST_INIT(&(*cdp)->head); 1242 } 1243 1244 int 1245 clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, 1246 struct cdev **dp, int extra) 1247 { 1248 struct clonedevs *cd; 1249 struct cdev *dev, *ndev, *dl, *de; 1250 int unit, low, u; 1251 1252 KASSERT(*cdp != NULL, 1253 ("clone_setup() not called in driver \"%s\"", csw->d_name)); 1254 KASSERT(!(extra & CLONE_UNITMASK), 1255 ("Illegal extra bits (0x%x) in clone_create", extra)); 1256 KASSERT(*up <= CLONE_UNITMASK, 1257 ("Too high unit (0x%x) in clone_create", *up)); 1258 KASSERT(csw->d_flags & D_NEEDMINOR, 1259 ("clone_create() on cdevsw without minor numbers")); 1260 1261 1262 /* 1263 * Search the list for a lot of things in one go: 1264 * A preexisting match is returned immediately. 1265 * The lowest free unit number if we are passed -1, and the place 1266 * in the list where we should insert that new element. 1267 * The place to insert a specified unit number, if applicable 1268 * the end of the list. 1269 */ 1270 unit = *up; 1271 ndev = devfs_alloc(MAKEDEV_WAITOK); 1272 dev_lock(); 1273 prep_cdevsw(csw, MAKEDEV_WAITOK); 1274 low = extra; 1275 de = dl = NULL; 1276 cd = *cdp; 1277 LIST_FOREACH(dev, &cd->head, si_clone) { 1278 KASSERT(dev->si_flags & SI_CLONELIST, 1279 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1280 u = dev2unit(dev); 1281 if (u == (unit | extra)) { 1282 *dp = dev; 1283 dev_unlock(); 1284 devfs_free(ndev); 1285 return (0); 1286 } 1287 if (unit == -1 && u == low) { 1288 low++; 1289 de = dev; 1290 continue; 1291 } else if (u < (unit | extra)) { 1292 de = dev; 1293 continue; 1294 } else if (u > (unit | extra)) { 1295 dl = dev; 1296 break; 1297 } 1298 } 1299 if (unit == -1) 1300 unit = low & CLONE_UNITMASK; 1301 dev = newdev(csw, unit | extra, ndev); 1302 if (dev->si_flags & SI_CLONELIST) { 1303 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 1304 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra); 1305 LIST_FOREACH(dev, &cd->head, si_clone) { 1306 printf("\t%p %s\n", dev, dev->si_name); 1307 } 1308 panic("foo"); 1309 } 1310 KASSERT(!(dev->si_flags & SI_CLONELIST), 1311 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 1312 if (dl != NULL) 1313 LIST_INSERT_BEFORE(dl, dev, si_clone); 1314 else if (de != NULL) 1315 LIST_INSERT_AFTER(de, dev, si_clone); 1316 else 1317 LIST_INSERT_HEAD(&cd->head, dev, si_clone); 1318 dev->si_flags |= SI_CLONELIST; 1319 *up = unit; 1320 dev_unlock_and_free(); 1321 return (1); 1322 } 1323 1324 /* 1325 * Kill everything still on the list. The driver should already have 1326 * disposed of any softc hung of the struct cdev *'s at this time. 1327 */ 1328 void 1329 clone_cleanup(struct clonedevs **cdp) 1330 { 1331 struct cdev *dev; 1332 struct cdev_priv *cp; 1333 struct clonedevs *cd; 1334 1335 cd = *cdp; 1336 if (cd == NULL) 1337 return; 1338 dev_lock(); 1339 while (!LIST_EMPTY(&cd->head)) { 1340 dev = LIST_FIRST(&cd->head); 1341 LIST_REMOVE(dev, si_clone); 1342 KASSERT(dev->si_flags & SI_CLONELIST, 1343 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1344 dev->si_flags &= ~SI_CLONELIST; 1345 cp = cdev2priv(dev); 1346 if (!(cp->cdp_flags & CDP_SCHED_DTR)) { 1347 cp->cdp_flags |= CDP_SCHED_DTR; 1348 KASSERT(dev->si_flags & SI_NAMED, 1349 ("Driver has goofed in cloning underways udev %x unit %x", dev2udev(dev), dev2unit(dev))); 1350 destroy_devl(dev); 1351 } 1352 } 1353 dev_unlock_and_free(); 1354 free(cd, M_DEVBUF); 1355 *cdp = NULL; 1356 } 1357 1358 static TAILQ_HEAD(, cdev_priv) dev_ddtr = 1359 TAILQ_HEAD_INITIALIZER(dev_ddtr); 1360 static struct task dev_dtr_task = TASK_INITIALIZER(0, destroy_dev_tq, NULL); 1361 1362 static void 1363 destroy_dev_tq(void *ctx, int pending) 1364 { 1365 struct cdev_priv *cp; 1366 struct cdev *dev; 1367 void (*cb)(void *); 1368 void *cb_arg; 1369 1370 dev_lock(); 1371 while (!TAILQ_EMPTY(&dev_ddtr)) { 1372 cp = TAILQ_FIRST(&dev_ddtr); 1373 dev = &cp->cdp_c; 1374 KASSERT(cp->cdp_flags & CDP_SCHED_DTR, 1375 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp)); 1376 TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list); 1377 cb = cp->cdp_dtr_cb; 1378 cb_arg = cp->cdp_dtr_cb_arg; 1379 destroy_devl(dev); 1380 dev_unlock_and_free(); 1381 dev_rel(dev); 1382 if (cb != NULL) 1383 cb(cb_arg); 1384 dev_lock(); 1385 } 1386 dev_unlock(); 1387 } 1388 1389 /* 1390 * devmtx shall be locked on entry. devmtx will be unlocked after 1391 * function return. 1392 */ 1393 static int 1394 destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg) 1395 { 1396 struct cdev_priv *cp; 1397 1398 mtx_assert(&devmtx, MA_OWNED); 1399 cp = cdev2priv(dev); 1400 if (cp->cdp_flags & CDP_SCHED_DTR) { 1401 dev_unlock(); 1402 return (0); 1403 } 1404 dev_refl(dev); 1405 cp->cdp_flags |= CDP_SCHED_DTR; 1406 cp->cdp_dtr_cb = cb; 1407 cp->cdp_dtr_cb_arg = arg; 1408 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list); 1409 dev_unlock(); 1410 taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task); 1411 return (1); 1412 } 1413 1414 int 1415 destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg) 1416 { 1417 1418 dev_lock(); 1419 return (destroy_dev_sched_cbl(dev, cb, arg)); 1420 } 1421 1422 int 1423 destroy_dev_sched(struct cdev *dev) 1424 { 1425 1426 return (destroy_dev_sched_cb(dev, NULL, NULL)); 1427 } 1428 1429 void 1430 destroy_dev_drain(struct cdevsw *csw) 1431 { 1432 1433 dev_lock(); 1434 while (!LIST_EMPTY(&csw->d_devs)) { 1435 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10); 1436 } 1437 dev_unlock(); 1438 } 1439 1440 void 1441 drain_dev_clone_events(void) 1442 { 1443 1444 sx_xlock(&clone_drain_lock); 1445 sx_xunlock(&clone_drain_lock); 1446 } 1447 1448 #include "opt_ddb.h" 1449 #ifdef DDB 1450 #include <sys/kernel.h> 1451 1452 #include <ddb/ddb.h> 1453 1454 DB_SHOW_COMMAND(cdev, db_show_cdev) 1455 { 1456 struct cdev_priv *cdp; 1457 struct cdev *dev; 1458 u_int flags; 1459 char buf[512]; 1460 1461 if (!have_addr) { 1462 TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { 1463 dev = &cdp->cdp_c; 1464 db_printf("%s %p\n", dev->si_name, dev); 1465 if (db_pager_quit) 1466 break; 1467 } 1468 return; 1469 } 1470 1471 dev = (struct cdev *)addr; 1472 cdp = cdev2priv(dev); 1473 db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n", 1474 dev->si_name, dev->si_refcount, dev->si_usecount, 1475 dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first); 1476 db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n", 1477 dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2); 1478 flags = dev->si_flags; 1479 #define SI_FLAG(flag) do { \ 1480 if (flags & (flag)) { \ 1481 if (buf[0] != '\0') \ 1482 strlcat(buf, ", ", sizeof(buf)); \ 1483 strlcat(buf, (#flag) + 3, sizeof(buf)); \ 1484 flags &= ~(flag); \ 1485 } \ 1486 } while (0) 1487 buf[0] = '\0'; 1488 SI_FLAG(SI_ETERNAL); 1489 SI_FLAG(SI_ALIAS); 1490 SI_FLAG(SI_NAMED); 1491 SI_FLAG(SI_CHEAPCLONE); 1492 SI_FLAG(SI_CHILD); 1493 SI_FLAG(SI_DUMPDEV); 1494 SI_FLAG(SI_CLONELIST); 1495 db_printf("si_flags %s\n", buf); 1496 1497 flags = cdp->cdp_flags; 1498 #define CDP_FLAG(flag) do { \ 1499 if (flags & (flag)) { \ 1500 if (buf[0] != '\0') \ 1501 strlcat(buf, ", ", sizeof(buf)); \ 1502 strlcat(buf, (#flag) + 4, sizeof(buf)); \ 1503 flags &= ~(flag); \ 1504 } \ 1505 } while (0) 1506 buf[0] = '\0'; 1507 CDP_FLAG(CDP_ACTIVE); 1508 CDP_FLAG(CDP_SCHED_DTR); 1509 db_printf("cdp_flags %s\n", buf); 1510 } 1511 #endif
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