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 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1999-2002 Poul-Henning Kamp 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: releng/12.0/sys/kern/kern_conf.c 333857 2018-05-19 05:07:03Z mmacy $"); 31 32 #include <sys/param.h> 33 #include <sys/kernel.h> 34 #include <sys/systm.h> 35 #include <sys/bus.h> 36 #include <sys/bio.h> 37 #include <sys/lock.h> 38 #include <sys/mutex.h> 39 #include <sys/module.h> 40 #include <sys/malloc.h> 41 #include <sys/conf.h> 42 #include <sys/vnode.h> 43 #include <sys/queue.h> 44 #include <sys/poll.h> 45 #include <sys/sx.h> 46 #include <sys/ctype.h> 47 #include <sys/ucred.h> 48 #include <sys/taskqueue.h> 49 #include <machine/stdarg.h> 50 51 #include <fs/devfs/devfs_int.h> 52 #include <vm/vm.h> 53 54 static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage"); 55 56 struct mtx devmtx; 57 static void destroy_devl(struct cdev *dev); 58 static int destroy_dev_sched_cbl(struct cdev *dev, 59 void (*cb)(void *), void *arg); 60 static void destroy_dev_tq(void *ctx, int pending); 61 static int make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, 62 int unit, struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 63 va_list ap); 64 65 static struct cdev_priv_list cdevp_free_list = 66 TAILQ_HEAD_INITIALIZER(cdevp_free_list); 67 static SLIST_HEAD(free_cdevsw, cdevsw) cdevsw_gt_post_list = 68 SLIST_HEAD_INITIALIZER(cdevsw_gt_post_list); 69 70 void 71 dev_lock(void) 72 { 73 74 mtx_lock(&devmtx); 75 } 76 77 /* 78 * Free all the memory collected while the cdev mutex was 79 * locked. Since devmtx is after the system map mutex, free() cannot 80 * be called immediately and is postponed until cdev mutex can be 81 * dropped. 82 */ 83 static void 84 dev_unlock_and_free(void) 85 { 86 struct cdev_priv_list cdp_free; 87 struct free_cdevsw csw_free; 88 struct cdev_priv *cdp; 89 struct cdevsw *csw; 90 91 mtx_assert(&devmtx, MA_OWNED); 92 93 /* 94 * Make the local copy of the list heads while the dev_mtx is 95 * held. Free it later. 96 */ 97 TAILQ_INIT(&cdp_free); 98 TAILQ_CONCAT(&cdp_free, &cdevp_free_list, cdp_list); 99 csw_free = cdevsw_gt_post_list; 100 SLIST_INIT(&cdevsw_gt_post_list); 101 102 mtx_unlock(&devmtx); 103 104 while ((cdp = TAILQ_FIRST(&cdp_free)) != NULL) { 105 TAILQ_REMOVE(&cdp_free, cdp, cdp_list); 106 devfs_free(&cdp->cdp_c); 107 } 108 while ((csw = SLIST_FIRST(&csw_free)) != NULL) { 109 SLIST_REMOVE_HEAD(&csw_free, d_postfree_list); 110 free(csw, M_DEVT); 111 } 112 } 113 114 static void 115 dev_free_devlocked(struct cdev *cdev) 116 { 117 struct cdev_priv *cdp; 118 119 mtx_assert(&devmtx, MA_OWNED); 120 cdp = cdev2priv(cdev); 121 KASSERT((cdp->cdp_flags & CDP_UNREF_DTR) == 0, 122 ("destroy_dev() was not called after delist_dev(%p)", cdev)); 123 TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list); 124 } 125 126 static void 127 cdevsw_free_devlocked(struct cdevsw *csw) 128 { 129 130 mtx_assert(&devmtx, MA_OWNED); 131 SLIST_INSERT_HEAD(&cdevsw_gt_post_list, csw, d_postfree_list); 132 } 133 134 void 135 dev_unlock(void) 136 { 137 138 mtx_unlock(&devmtx); 139 } 140 141 void 142 dev_ref(struct cdev *dev) 143 { 144 145 mtx_assert(&devmtx, MA_NOTOWNED); 146 mtx_lock(&devmtx); 147 dev->si_refcount++; 148 mtx_unlock(&devmtx); 149 } 150 151 void 152 dev_refl(struct cdev *dev) 153 { 154 155 mtx_assert(&devmtx, MA_OWNED); 156 dev->si_refcount++; 157 } 158 159 void 160 dev_rel(struct cdev *dev) 161 { 162 int flag = 0; 163 164 mtx_assert(&devmtx, MA_NOTOWNED); 165 dev_lock(); 166 dev->si_refcount--; 167 KASSERT(dev->si_refcount >= 0, 168 ("dev_rel(%s) gave negative count", devtoname(dev))); 169 #if 0 170 if (dev->si_usecount == 0 && 171 (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED)) 172 ; 173 else 174 #endif 175 if (dev->si_devsw == NULL && dev->si_refcount == 0) { 176 LIST_REMOVE(dev, si_list); 177 flag = 1; 178 } 179 dev_unlock(); 180 if (flag) 181 devfs_free(dev); 182 } 183 184 struct cdevsw * 185 dev_refthread(struct cdev *dev, int *ref) 186 { 187 struct cdevsw *csw; 188 struct cdev_priv *cdp; 189 190 mtx_assert(&devmtx, MA_NOTOWNED); 191 if ((dev->si_flags & SI_ETERNAL) != 0) { 192 *ref = 0; 193 return (dev->si_devsw); 194 } 195 dev_lock(); 196 csw = dev->si_devsw; 197 if (csw != NULL) { 198 cdp = cdev2priv(dev); 199 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) 200 atomic_add_long(&dev->si_threadcount, 1); 201 else 202 csw = NULL; 203 } 204 dev_unlock(); 205 *ref = 1; 206 return (csw); 207 } 208 209 struct cdevsw * 210 devvn_refthread(struct vnode *vp, struct cdev **devp, int *ref) 211 { 212 struct cdevsw *csw; 213 struct cdev_priv *cdp; 214 struct cdev *dev; 215 216 mtx_assert(&devmtx, MA_NOTOWNED); 217 if ((vp->v_vflag & VV_ETERNALDEV) != 0) { 218 dev = vp->v_rdev; 219 if (dev == NULL) 220 return (NULL); 221 KASSERT((dev->si_flags & SI_ETERNAL) != 0, 222 ("Not eternal cdev")); 223 *ref = 0; 224 csw = dev->si_devsw; 225 KASSERT(csw != NULL, ("Eternal cdev is destroyed")); 226 *devp = dev; 227 return (csw); 228 } 229 230 csw = NULL; 231 dev_lock(); 232 dev = vp->v_rdev; 233 if (dev == NULL) { 234 dev_unlock(); 235 return (NULL); 236 } 237 cdp = cdev2priv(dev); 238 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) { 239 csw = dev->si_devsw; 240 if (csw != NULL) 241 atomic_add_long(&dev->si_threadcount, 1); 242 } 243 dev_unlock(); 244 if (csw != NULL) { 245 *devp = dev; 246 *ref = 1; 247 } 248 return (csw); 249 } 250 251 void 252 dev_relthread(struct cdev *dev, int ref) 253 { 254 255 mtx_assert(&devmtx, MA_NOTOWNED); 256 if (!ref) 257 return; 258 KASSERT(dev->si_threadcount > 0, 259 ("%s threadcount is wrong", dev->si_name)); 260 atomic_subtract_rel_long(&dev->si_threadcount, 1); 261 } 262 263 int 264 nullop(void) 265 { 266 267 return (0); 268 } 269 270 int 271 eopnotsupp(void) 272 { 273 274 return (EOPNOTSUPP); 275 } 276 277 static int 278 enxio(void) 279 { 280 return (ENXIO); 281 } 282 283 static int 284 enodev(void) 285 { 286 return (ENODEV); 287 } 288 289 /* Define a dead_cdevsw for use when devices leave unexpectedly. */ 290 291 #define dead_open (d_open_t *)enxio 292 #define dead_close (d_close_t *)enxio 293 #define dead_read (d_read_t *)enxio 294 #define dead_write (d_write_t *)enxio 295 #define dead_ioctl (d_ioctl_t *)enxio 296 #define dead_poll (d_poll_t *)enodev 297 #define dead_mmap (d_mmap_t *)enodev 298 299 static void 300 dead_strategy(struct bio *bp) 301 { 302 303 biofinish(bp, NULL, ENXIO); 304 } 305 306 #define dead_dump (dumper_t *)enxio 307 #define dead_kqfilter (d_kqfilter_t *)enxio 308 #define dead_mmap_single (d_mmap_single_t *)enodev 309 310 static struct cdevsw dead_cdevsw = { 311 .d_version = D_VERSION, 312 .d_open = dead_open, 313 .d_close = dead_close, 314 .d_read = dead_read, 315 .d_write = dead_write, 316 .d_ioctl = dead_ioctl, 317 .d_poll = dead_poll, 318 .d_mmap = dead_mmap, 319 .d_strategy = dead_strategy, 320 .d_name = "dead", 321 .d_dump = dead_dump, 322 .d_kqfilter = dead_kqfilter, 323 .d_mmap_single = dead_mmap_single 324 }; 325 326 /* Default methods if driver does not specify method */ 327 328 #define null_open (d_open_t *)nullop 329 #define null_close (d_close_t *)nullop 330 #define no_read (d_read_t *)enodev 331 #define no_write (d_write_t *)enodev 332 #define no_ioctl (d_ioctl_t *)enodev 333 #define no_mmap (d_mmap_t *)enodev 334 #define no_kqfilter (d_kqfilter_t *)enodev 335 #define no_mmap_single (d_mmap_single_t *)enodev 336 337 static void 338 no_strategy(struct bio *bp) 339 { 340 341 biofinish(bp, NULL, ENODEV); 342 } 343 344 static int 345 no_poll(struct cdev *dev __unused, int events, struct thread *td __unused) 346 { 347 348 return (poll_no_poll(events)); 349 } 350 351 #define no_dump (dumper_t *)enodev 352 353 static int 354 giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 355 { 356 struct cdevsw *dsw; 357 int ref, retval; 358 359 dsw = dev_refthread(dev, &ref); 360 if (dsw == NULL) 361 return (ENXIO); 362 mtx_lock(&Giant); 363 retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td); 364 mtx_unlock(&Giant); 365 dev_relthread(dev, ref); 366 return (retval); 367 } 368 369 static int 370 giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp) 371 { 372 struct cdevsw *dsw; 373 int ref, retval; 374 375 dsw = dev_refthread(dev, &ref); 376 if (dsw == NULL) 377 return (ENXIO); 378 mtx_lock(&Giant); 379 retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp); 380 mtx_unlock(&Giant); 381 dev_relthread(dev, ref); 382 return (retval); 383 } 384 385 static int 386 giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 387 { 388 struct cdevsw *dsw; 389 int ref, retval; 390 391 dsw = dev_refthread(dev, &ref); 392 if (dsw == NULL) 393 return (ENXIO); 394 mtx_lock(&Giant); 395 retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td); 396 mtx_unlock(&Giant); 397 dev_relthread(dev, ref); 398 return (retval); 399 } 400 401 static void 402 giant_strategy(struct bio *bp) 403 { 404 struct cdevsw *dsw; 405 struct cdev *dev; 406 int ref; 407 408 dev = bp->bio_dev; 409 dsw = dev_refthread(dev, &ref); 410 if (dsw == NULL) { 411 biofinish(bp, NULL, ENXIO); 412 return; 413 } 414 mtx_lock(&Giant); 415 dsw->d_gianttrick->d_strategy(bp); 416 mtx_unlock(&Giant); 417 dev_relthread(dev, ref); 418 } 419 420 static int 421 giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 422 { 423 struct cdevsw *dsw; 424 int ref, retval; 425 426 dsw = dev_refthread(dev, &ref); 427 if (dsw == NULL) 428 return (ENXIO); 429 mtx_lock(&Giant); 430 retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td); 431 mtx_unlock(&Giant); 432 dev_relthread(dev, ref); 433 return (retval); 434 } 435 436 static int 437 giant_read(struct cdev *dev, struct uio *uio, int ioflag) 438 { 439 struct cdevsw *dsw; 440 int ref, retval; 441 442 dsw = dev_refthread(dev, &ref); 443 if (dsw == NULL) 444 return (ENXIO); 445 mtx_lock(&Giant); 446 retval = dsw->d_gianttrick->d_read(dev, uio, ioflag); 447 mtx_unlock(&Giant); 448 dev_relthread(dev, ref); 449 return (retval); 450 } 451 452 static int 453 giant_write(struct cdev *dev, struct uio *uio, int ioflag) 454 { 455 struct cdevsw *dsw; 456 int ref, retval; 457 458 dsw = dev_refthread(dev, &ref); 459 if (dsw == NULL) 460 return (ENXIO); 461 mtx_lock(&Giant); 462 retval = dsw->d_gianttrick->d_write(dev, uio, ioflag); 463 mtx_unlock(&Giant); 464 dev_relthread(dev, ref); 465 return (retval); 466 } 467 468 static int 469 giant_poll(struct cdev *dev, int events, struct thread *td) 470 { 471 struct cdevsw *dsw; 472 int ref, retval; 473 474 dsw = dev_refthread(dev, &ref); 475 if (dsw == NULL) 476 return (ENXIO); 477 mtx_lock(&Giant); 478 retval = dsw->d_gianttrick->d_poll(dev, events, td); 479 mtx_unlock(&Giant); 480 dev_relthread(dev, ref); 481 return (retval); 482 } 483 484 static int 485 giant_kqfilter(struct cdev *dev, struct knote *kn) 486 { 487 struct cdevsw *dsw; 488 int ref, retval; 489 490 dsw = dev_refthread(dev, &ref); 491 if (dsw == NULL) 492 return (ENXIO); 493 mtx_lock(&Giant); 494 retval = dsw->d_gianttrick->d_kqfilter(dev, kn); 495 mtx_unlock(&Giant); 496 dev_relthread(dev, ref); 497 return (retval); 498 } 499 500 static int 501 giant_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot, 502 vm_memattr_t *memattr) 503 { 504 struct cdevsw *dsw; 505 int ref, retval; 506 507 dsw = dev_refthread(dev, &ref); 508 if (dsw == NULL) 509 return (ENXIO); 510 mtx_lock(&Giant); 511 retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot, 512 memattr); 513 mtx_unlock(&Giant); 514 dev_relthread(dev, ref); 515 return (retval); 516 } 517 518 static int 519 giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size, 520 vm_object_t *object, int nprot) 521 { 522 struct cdevsw *dsw; 523 int ref, retval; 524 525 dsw = dev_refthread(dev, &ref); 526 if (dsw == NULL) 527 return (ENXIO); 528 mtx_lock(&Giant); 529 retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object, 530 nprot); 531 mtx_unlock(&Giant); 532 dev_relthread(dev, ref); 533 return (retval); 534 } 535 536 static void 537 notify(struct cdev *dev, const char *ev, int flags) 538 { 539 static const char prefix[] = "cdev="; 540 char *data; 541 int namelen, mflags; 542 543 if (cold) 544 return; 545 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; 546 namelen = strlen(dev->si_name); 547 data = malloc(namelen + sizeof(prefix), M_TEMP, mflags); 548 if (data == NULL) 549 return; 550 memcpy(data, prefix, sizeof(prefix) - 1); 551 memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1); 552 devctl_notify_f("DEVFS", "CDEV", ev, data, mflags); 553 free(data, M_TEMP); 554 } 555 556 static void 557 notify_create(struct cdev *dev, int flags) 558 { 559 560 notify(dev, "CREATE", flags); 561 } 562 563 static void 564 notify_destroy(struct cdev *dev) 565 { 566 567 notify(dev, "DESTROY", MAKEDEV_WAITOK); 568 } 569 570 static struct cdev * 571 newdev(struct make_dev_args *args, struct cdev *si) 572 { 573 struct cdev *si2; 574 struct cdevsw *csw; 575 576 mtx_assert(&devmtx, MA_OWNED); 577 csw = args->mda_devsw; 578 if (csw->d_flags & D_NEEDMINOR) { 579 /* We may want to return an existing device */ 580 LIST_FOREACH(si2, &csw->d_devs, si_list) { 581 if (dev2unit(si2) == args->mda_unit) { 582 dev_free_devlocked(si); 583 return (si2); 584 } 585 } 586 } 587 si->si_drv0 = args->mda_unit; 588 si->si_devsw = csw; 589 si->si_drv1 = args->mda_si_drv1; 590 si->si_drv2 = args->mda_si_drv2; 591 LIST_INSERT_HEAD(&csw->d_devs, si, si_list); 592 return (si); 593 } 594 595 static void 596 fini_cdevsw(struct cdevsw *devsw) 597 { 598 struct cdevsw *gt; 599 600 if (devsw->d_gianttrick != NULL) { 601 gt = devsw->d_gianttrick; 602 memcpy(devsw, gt, sizeof *devsw); 603 cdevsw_free_devlocked(gt); 604 devsw->d_gianttrick = NULL; 605 } 606 devsw->d_flags &= ~D_INIT; 607 } 608 609 static int 610 prep_cdevsw(struct cdevsw *devsw, int flags) 611 { 612 struct cdevsw *dsw2; 613 614 mtx_assert(&devmtx, MA_OWNED); 615 if (devsw->d_flags & D_INIT) 616 return (0); 617 if (devsw->d_flags & D_NEEDGIANT) { 618 dev_unlock(); 619 dsw2 = malloc(sizeof *dsw2, M_DEVT, 620 (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK); 621 dev_lock(); 622 if (dsw2 == NULL && !(devsw->d_flags & D_INIT)) 623 return (ENOMEM); 624 } else 625 dsw2 = NULL; 626 if (devsw->d_flags & D_INIT) { 627 if (dsw2 != NULL) 628 cdevsw_free_devlocked(dsw2); 629 return (0); 630 } 631 632 if (devsw->d_version != D_VERSION_03) { 633 printf( 634 "WARNING: Device driver \"%s\" has wrong version %s\n", 635 devsw->d_name == NULL ? "???" : devsw->d_name, 636 "and is disabled. Recompile KLD module."); 637 devsw->d_open = dead_open; 638 devsw->d_close = dead_close; 639 devsw->d_read = dead_read; 640 devsw->d_write = dead_write; 641 devsw->d_ioctl = dead_ioctl; 642 devsw->d_poll = dead_poll; 643 devsw->d_mmap = dead_mmap; 644 devsw->d_mmap_single = dead_mmap_single; 645 devsw->d_strategy = dead_strategy; 646 devsw->d_dump = dead_dump; 647 devsw->d_kqfilter = dead_kqfilter; 648 } 649 650 if (devsw->d_flags & D_NEEDGIANT) { 651 if (devsw->d_gianttrick == NULL) { 652 memcpy(dsw2, devsw, sizeof *dsw2); 653 devsw->d_gianttrick = dsw2; 654 dsw2 = NULL; 655 } 656 } 657 658 #define FIXUP(member, noop, giant) \ 659 do { \ 660 if (devsw->member == NULL) { \ 661 devsw->member = noop; \ 662 } else if (devsw->d_flags & D_NEEDGIANT) \ 663 devsw->member = giant; \ 664 } \ 665 while (0) 666 667 FIXUP(d_open, null_open, giant_open); 668 FIXUP(d_fdopen, NULL, giant_fdopen); 669 FIXUP(d_close, null_close, giant_close); 670 FIXUP(d_read, no_read, giant_read); 671 FIXUP(d_write, no_write, giant_write); 672 FIXUP(d_ioctl, no_ioctl, giant_ioctl); 673 FIXUP(d_poll, no_poll, giant_poll); 674 FIXUP(d_mmap, no_mmap, giant_mmap); 675 FIXUP(d_strategy, no_strategy, giant_strategy); 676 FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter); 677 FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single); 678 679 if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 680 681 LIST_INIT(&devsw->d_devs); 682 683 devsw->d_flags |= D_INIT; 684 685 if (dsw2 != NULL) 686 cdevsw_free_devlocked(dsw2); 687 return (0); 688 } 689 690 static int 691 prep_devname(struct cdev *dev, const char *fmt, va_list ap) 692 { 693 int len; 694 char *from, *q, *s, *to; 695 696 mtx_assert(&devmtx, MA_OWNED); 697 698 len = vsnrprintf(dev->si_name, sizeof(dev->si_name), 32, fmt, ap); 699 if (len > sizeof(dev->si_name) - 1) 700 return (ENAMETOOLONG); 701 702 /* Strip leading slashes. */ 703 for (from = dev->si_name; *from == '/'; from++) 704 ; 705 706 for (to = dev->si_name; *from != '\0'; from++, to++) { 707 /* 708 * Spaces and double quotation marks cause 709 * problems for the devctl(4) protocol. 710 * Reject names containing those characters. 711 */ 712 if (isspace(*from) || *from == '"') 713 return (EINVAL); 714 /* Treat multiple sequential slashes as single. */ 715 while (from[0] == '/' && from[1] == '/') 716 from++; 717 /* Trailing slash is considered invalid. */ 718 if (from[0] == '/' && from[1] == '\0') 719 return (EINVAL); 720 *to = *from; 721 } 722 *to = '\0'; 723 724 if (dev->si_name[0] == '\0') 725 return (EINVAL); 726 727 /* Disallow "." and ".." components. */ 728 for (s = dev->si_name;;) { 729 for (q = s; *q != '/' && *q != '\0'; q++) 730 ; 731 if (q - s == 1 && s[0] == '.') 732 return (EINVAL); 733 if (q - s == 2 && s[0] == '.' && s[1] == '.') 734 return (EINVAL); 735 if (*q != '/') 736 break; 737 s = q + 1; 738 } 739 740 if (devfs_dev_exists(dev->si_name) != 0) 741 return (EEXIST); 742 743 return (0); 744 } 745 746 void 747 make_dev_args_init_impl(struct make_dev_args *args, size_t sz) 748 { 749 750 bzero(args, sz); 751 args->mda_size = sz; 752 } 753 754 static int 755 make_dev_sv(struct make_dev_args *args1, struct cdev **dres, 756 const char *fmt, va_list ap) 757 { 758 struct cdev *dev, *dev_new; 759 struct make_dev_args args; 760 int res; 761 762 bzero(&args, sizeof(args)); 763 if (sizeof(args) < args1->mda_size) 764 return (EINVAL); 765 bcopy(args1, &args, args1->mda_size); 766 KASSERT((args.mda_flags & MAKEDEV_WAITOK) == 0 || 767 (args.mda_flags & MAKEDEV_NOWAIT) == 0, 768 ("make_dev_sv: both WAITOK and NOWAIT specified")); 769 dev_new = devfs_alloc(args.mda_flags); 770 if (dev_new == NULL) 771 return (ENOMEM); 772 dev_lock(); 773 res = prep_cdevsw(args.mda_devsw, args.mda_flags); 774 if (res != 0) { 775 dev_unlock(); 776 devfs_free(dev_new); 777 return (res); 778 } 779 dev = newdev(&args, dev_new); 780 if ((dev->si_flags & SI_NAMED) == 0) { 781 res = prep_devname(dev, fmt, ap); 782 if (res != 0) { 783 if ((args.mda_flags & MAKEDEV_CHECKNAME) == 0) { 784 panic( 785 "make_dev_sv: bad si_name (error=%d, si_name=%s)", 786 res, dev->si_name); 787 } 788 if (dev == dev_new) { 789 LIST_REMOVE(dev, si_list); 790 dev_unlock(); 791 devfs_free(dev); 792 } else 793 dev_unlock(); 794 return (res); 795 } 796 } 797 if ((args.mda_flags & MAKEDEV_REF) != 0) 798 dev_refl(dev); 799 if ((args.mda_flags & MAKEDEV_ETERNAL) != 0) 800 dev->si_flags |= SI_ETERNAL; 801 if (dev->si_flags & SI_CHEAPCLONE && 802 dev->si_flags & SI_NAMED) { 803 /* 804 * This is allowed as it removes races and generally 805 * simplifies cloning devices. 806 * XXX: still ?? 807 */ 808 dev_unlock_and_free(); 809 *dres = dev; 810 return (0); 811 } 812 KASSERT(!(dev->si_flags & SI_NAMED), 813 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", 814 args.mda_devsw->d_name, dev2unit(dev), devtoname(dev))); 815 dev->si_flags |= SI_NAMED; 816 if (args.mda_cr != NULL) 817 dev->si_cred = crhold(args.mda_cr); 818 dev->si_uid = args.mda_uid; 819 dev->si_gid = args.mda_gid; 820 dev->si_mode = args.mda_mode; 821 822 devfs_create(dev); 823 clean_unrhdrl(devfs_inos); 824 dev_unlock_and_free(); 825 826 notify_create(dev, args.mda_flags); 827 828 *dres = dev; 829 return (0); 830 } 831 832 int 833 make_dev_s(struct make_dev_args *args, struct cdev **dres, 834 const char *fmt, ...) 835 { 836 va_list ap; 837 int res; 838 839 va_start(ap, fmt); 840 res = make_dev_sv(args, dres, fmt, ap); 841 va_end(ap); 842 return (res); 843 } 844 845 static int 846 make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit, 847 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 848 va_list ap) 849 { 850 struct make_dev_args args; 851 852 make_dev_args_init(&args); 853 args.mda_flags = flags; 854 args.mda_devsw = devsw; 855 args.mda_cr = cr; 856 args.mda_uid = uid; 857 args.mda_gid = gid; 858 args.mda_mode = mode; 859 args.mda_unit = unit; 860 return (make_dev_sv(&args, dres, fmt, ap)); 861 } 862 863 struct cdev * 864 make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode, 865 const char *fmt, ...) 866 { 867 struct cdev *dev; 868 va_list ap; 869 int res __unused; 870 871 va_start(ap, fmt); 872 res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt, 873 ap); 874 va_end(ap); 875 KASSERT(res == 0 && dev != NULL, 876 ("make_dev: failed make_dev_credv (error=%d)", res)); 877 return (dev); 878 } 879 880 struct cdev * 881 make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid, 882 gid_t gid, int mode, const char *fmt, ...) 883 { 884 struct cdev *dev; 885 va_list ap; 886 int res __unused; 887 888 va_start(ap, fmt); 889 res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap); 890 va_end(ap); 891 892 KASSERT(res == 0 && dev != NULL, 893 ("make_dev_cred: failed make_dev_credv (error=%d)", res)); 894 return (dev); 895 } 896 897 struct cdev * 898 make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr, 899 uid_t uid, gid_t gid, int mode, const char *fmt, ...) 900 { 901 struct cdev *dev; 902 va_list ap; 903 int res; 904 905 va_start(ap, fmt); 906 res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode, 907 fmt, ap); 908 va_end(ap); 909 910 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 911 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 912 ("make_dev_credf: failed make_dev_credv (error=%d)", res)); 913 return (res == 0 ? dev : NULL); 914 } 915 916 int 917 make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw, 918 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...) 919 { 920 va_list ap; 921 int res; 922 923 va_start(ap, fmt); 924 res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode, 925 fmt, ap); 926 va_end(ap); 927 928 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 929 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 930 ("make_dev_p: failed make_dev_credv (error=%d)", res)); 931 return (res); 932 } 933 934 static void 935 dev_dependsl(struct cdev *pdev, struct cdev *cdev) 936 { 937 938 cdev->si_parent = pdev; 939 cdev->si_flags |= SI_CHILD; 940 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 941 } 942 943 944 void 945 dev_depends(struct cdev *pdev, struct cdev *cdev) 946 { 947 948 dev_lock(); 949 dev_dependsl(pdev, cdev); 950 dev_unlock(); 951 } 952 953 static int 954 make_dev_alias_v(int flags, struct cdev **cdev, struct cdev *pdev, 955 const char *fmt, va_list ap) 956 { 957 struct cdev *dev; 958 int error; 959 960 KASSERT(pdev != NULL, ("make_dev_alias_v: pdev is NULL")); 961 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, 962 ("make_dev_alias_v: both WAITOK and NOWAIT specified")); 963 KASSERT((flags & ~(MAKEDEV_WAITOK | MAKEDEV_NOWAIT | 964 MAKEDEV_CHECKNAME)) == 0, 965 ("make_dev_alias_v: invalid flags specified (flags=%02x)", flags)); 966 967 dev = devfs_alloc(flags); 968 if (dev == NULL) 969 return (ENOMEM); 970 dev_lock(); 971 dev->si_flags |= SI_ALIAS; 972 error = prep_devname(dev, fmt, ap); 973 if (error != 0) { 974 if ((flags & MAKEDEV_CHECKNAME) == 0) { 975 panic("make_dev_alias_v: bad si_name " 976 "(error=%d, si_name=%s)", error, dev->si_name); 977 } 978 dev_unlock(); 979 devfs_free(dev); 980 return (error); 981 } 982 dev->si_flags |= SI_NAMED; 983 devfs_create(dev); 984 dev_dependsl(pdev, dev); 985 clean_unrhdrl(devfs_inos); 986 dev_unlock(); 987 988 notify_create(dev, flags); 989 *cdev = dev; 990 991 return (0); 992 } 993 994 struct cdev * 995 make_dev_alias(struct cdev *pdev, const char *fmt, ...) 996 { 997 struct cdev *dev; 998 va_list ap; 999 int res __unused; 1000 1001 va_start(ap, fmt); 1002 res = make_dev_alias_v(MAKEDEV_WAITOK, &dev, pdev, fmt, ap); 1003 va_end(ap); 1004 1005 KASSERT(res == 0 && dev != NULL, 1006 ("make_dev_alias: failed make_dev_alias_v (error=%d)", res)); 1007 return (dev); 1008 } 1009 1010 int 1011 make_dev_alias_p(int flags, struct cdev **cdev, struct cdev *pdev, 1012 const char *fmt, ...) 1013 { 1014 va_list ap; 1015 int res; 1016 1017 va_start(ap, fmt); 1018 res = make_dev_alias_v(flags, cdev, pdev, fmt, ap); 1019 va_end(ap); 1020 return (res); 1021 } 1022 1023 int 1024 make_dev_physpath_alias(int flags, struct cdev **cdev, struct cdev *pdev, 1025 struct cdev *old_alias, const char *physpath) 1026 { 1027 char *devfspath; 1028 int physpath_len; 1029 int max_parentpath_len; 1030 int parentpath_len; 1031 int devfspathbuf_len; 1032 int mflags; 1033 int ret; 1034 1035 *cdev = NULL; 1036 devfspath = NULL; 1037 physpath_len = strlen(physpath); 1038 ret = EINVAL; 1039 if (physpath_len == 0) 1040 goto out; 1041 1042 if (strncmp("id1,", physpath, 4) == 0) { 1043 physpath += 4; 1044 physpath_len -= 4; 1045 if (physpath_len == 0) 1046 goto out; 1047 } 1048 1049 max_parentpath_len = SPECNAMELEN - physpath_len - /*/*/1; 1050 parentpath_len = strlen(pdev->si_name); 1051 if (max_parentpath_len < parentpath_len) { 1052 if (bootverbose) 1053 printf("WARNING: Unable to alias %s " 1054 "to %s/%s - path too long\n", 1055 pdev->si_name, physpath, pdev->si_name); 1056 ret = ENAMETOOLONG; 1057 goto out; 1058 } 1059 1060 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; 1061 devfspathbuf_len = physpath_len + /*/*/1 + parentpath_len + /*NUL*/1; 1062 devfspath = malloc(devfspathbuf_len, M_DEVBUF, mflags); 1063 if (devfspath == NULL) { 1064 ret = ENOMEM; 1065 goto out; 1066 } 1067 1068 sprintf(devfspath, "%s/%s", physpath, pdev->si_name); 1069 if (old_alias != NULL && strcmp(old_alias->si_name, devfspath) == 0) { 1070 /* Retain the existing alias. */ 1071 *cdev = old_alias; 1072 old_alias = NULL; 1073 ret = 0; 1074 } else { 1075 ret = make_dev_alias_p(flags, cdev, pdev, "%s", devfspath); 1076 } 1077 out: 1078 if (old_alias != NULL) 1079 destroy_dev(old_alias); 1080 if (devfspath != NULL) 1081 free(devfspath, M_DEVBUF); 1082 return (ret); 1083 } 1084 1085 static void 1086 destroy_devl(struct cdev *dev) 1087 { 1088 struct cdevsw *csw; 1089 struct cdev_privdata *p; 1090 struct cdev_priv *cdp; 1091 1092 mtx_assert(&devmtx, MA_OWNED); 1093 KASSERT(dev->si_flags & SI_NAMED, 1094 ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev))); 1095 KASSERT((dev->si_flags & SI_ETERNAL) == 0, 1096 ("WARNING: Driver mistake: destroy_dev on eternal %d\n", 1097 dev2unit(dev))); 1098 1099 cdp = cdev2priv(dev); 1100 if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) { 1101 /* 1102 * Avoid race with dev_rel(), e.g. from the populate 1103 * loop. If CDP_UNREF_DTR flag is set, the reference 1104 * to be dropped at the end of destroy_devl() was 1105 * already taken by delist_dev_locked(). 1106 */ 1107 dev_refl(dev); 1108 1109 devfs_destroy(dev); 1110 } 1111 1112 /* Remove name marking */ 1113 dev->si_flags &= ~SI_NAMED; 1114 1115 /* If we are a child, remove us from the parents list */ 1116 if (dev->si_flags & SI_CHILD) { 1117 LIST_REMOVE(dev, si_siblings); 1118 dev->si_flags &= ~SI_CHILD; 1119 } 1120 1121 /* Kill our children */ 1122 while (!LIST_EMPTY(&dev->si_children)) 1123 destroy_devl(LIST_FIRST(&dev->si_children)); 1124 1125 /* Remove from clone list */ 1126 if (dev->si_flags & SI_CLONELIST) { 1127 LIST_REMOVE(dev, si_clone); 1128 dev->si_flags &= ~SI_CLONELIST; 1129 } 1130 1131 csw = dev->si_devsw; 1132 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 1133 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 1134 csw->d_purge(dev); 1135 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 1136 if (dev->si_threadcount) 1137 printf("Still %lu threads in %s\n", 1138 dev->si_threadcount, devtoname(dev)); 1139 } 1140 while (dev->si_threadcount != 0) { 1141 /* Use unique dummy wait ident */ 1142 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10); 1143 } 1144 1145 dev_unlock(); 1146 if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) { 1147 /* avoid out of order notify events */ 1148 notify_destroy(dev); 1149 } 1150 mtx_lock(&cdevpriv_mtx); 1151 while ((p = LIST_FIRST(&cdp->cdp_fdpriv)) != NULL) { 1152 devfs_destroy_cdevpriv(p); 1153 mtx_lock(&cdevpriv_mtx); 1154 } 1155 mtx_unlock(&cdevpriv_mtx); 1156 dev_lock(); 1157 1158 dev->si_drv1 = 0; 1159 dev->si_drv2 = 0; 1160 bzero(&dev->__si_u, sizeof(dev->__si_u)); 1161 1162 if (!(dev->si_flags & SI_ALIAS)) { 1163 /* Remove from cdevsw list */ 1164 LIST_REMOVE(dev, si_list); 1165 1166 /* If cdevsw has no more struct cdev *'s, clean it */ 1167 if (LIST_EMPTY(&csw->d_devs)) { 1168 fini_cdevsw(csw); 1169 wakeup(&csw->d_devs); 1170 } 1171 } 1172 dev->si_flags &= ~SI_ALIAS; 1173 cdp->cdp_flags &= ~CDP_UNREF_DTR; 1174 dev->si_refcount--; 1175 1176 if (dev->si_refcount > 0) 1177 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 1178 else 1179 dev_free_devlocked(dev); 1180 } 1181 1182 static void 1183 delist_dev_locked(struct cdev *dev) 1184 { 1185 struct cdev_priv *cdp; 1186 struct cdev *child; 1187 1188 mtx_assert(&devmtx, MA_OWNED); 1189 cdp = cdev2priv(dev); 1190 if ((cdp->cdp_flags & CDP_UNREF_DTR) != 0) 1191 return; 1192 cdp->cdp_flags |= CDP_UNREF_DTR; 1193 dev_refl(dev); 1194 devfs_destroy(dev); 1195 LIST_FOREACH(child, &dev->si_children, si_siblings) 1196 delist_dev_locked(child); 1197 dev_unlock(); 1198 /* ensure the destroy event is queued in order */ 1199 notify_destroy(dev); 1200 dev_lock(); 1201 } 1202 1203 /* 1204 * This function will delist a character device and its children from 1205 * the directory listing and create a destroy event without waiting 1206 * for all character device references to go away. At some later point 1207 * destroy_dev() must be called to complete the character device 1208 * destruction. After calling this function the character device name 1209 * can instantly be re-used. 1210 */ 1211 void 1212 delist_dev(struct cdev *dev) 1213 { 1214 1215 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "delist_dev"); 1216 dev_lock(); 1217 delist_dev_locked(dev); 1218 dev_unlock(); 1219 } 1220 1221 void 1222 destroy_dev(struct cdev *dev) 1223 { 1224 1225 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev"); 1226 dev_lock(); 1227 destroy_devl(dev); 1228 dev_unlock_and_free(); 1229 } 1230 1231 const char * 1232 devtoname(struct cdev *dev) 1233 { 1234 1235 return (dev->si_name); 1236 } 1237 1238 int 1239 dev_stdclone(char *name, char **namep, const char *stem, int *unit) 1240 { 1241 int u, i; 1242 1243 i = strlen(stem); 1244 if (bcmp(stem, name, i) != 0) 1245 return (0); 1246 if (!isdigit(name[i])) 1247 return (0); 1248 u = 0; 1249 if (name[i] == '' && isdigit(name[i+1])) 1250 return (0); 1251 while (isdigit(name[i])) { 1252 u *= 10; 1253 u += name[i++] - ''; 1254 } 1255 if (u > 0xffffff) 1256 return (0); 1257 *unit = u; 1258 if (namep) 1259 *namep = &name[i]; 1260 if (name[i]) 1261 return (2); 1262 return (1); 1263 } 1264 1265 /* 1266 * Helper functions for cloning device drivers. 1267 * 1268 * The objective here is to make it unnecessary for the device drivers to 1269 * use rman or similar to manage their unit number space. Due to the way 1270 * we do "on-demand" devices, using rman or other "private" methods 1271 * will be very tricky to lock down properly once we lock down this file. 1272 * 1273 * Instead we give the drivers these routines which puts the struct cdev *'s 1274 * that are to be managed on their own list, and gives the driver the ability 1275 * to ask for the first free unit number or a given specified unit number. 1276 * 1277 * In addition these routines support paired devices (pty, nmdm and similar) 1278 * by respecting a number of "flag" bits in the minor number. 1279 * 1280 */ 1281 1282 struct clonedevs { 1283 LIST_HEAD(,cdev) head; 1284 }; 1285 1286 void 1287 clone_setup(struct clonedevs **cdp) 1288 { 1289 1290 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 1291 LIST_INIT(&(*cdp)->head); 1292 } 1293 1294 int 1295 clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, 1296 struct cdev **dp, int extra) 1297 { 1298 struct clonedevs *cd; 1299 struct cdev *dev, *ndev, *dl, *de; 1300 struct make_dev_args args; 1301 int unit, low, u; 1302 1303 KASSERT(*cdp != NULL, 1304 ("clone_setup() not called in driver \"%s\"", csw->d_name)); 1305 KASSERT(!(extra & CLONE_UNITMASK), 1306 ("Illegal extra bits (0x%x) in clone_create", extra)); 1307 KASSERT(*up <= CLONE_UNITMASK, 1308 ("Too high unit (0x%x) in clone_create", *up)); 1309 KASSERT(csw->d_flags & D_NEEDMINOR, 1310 ("clone_create() on cdevsw without minor numbers")); 1311 1312 1313 /* 1314 * Search the list for a lot of things in one go: 1315 * A preexisting match is returned immediately. 1316 * The lowest free unit number if we are passed -1, and the place 1317 * in the list where we should insert that new element. 1318 * The place to insert a specified unit number, if applicable 1319 * the end of the list. 1320 */ 1321 unit = *up; 1322 ndev = devfs_alloc(MAKEDEV_WAITOK); 1323 dev_lock(); 1324 prep_cdevsw(csw, MAKEDEV_WAITOK); 1325 low = extra; 1326 de = dl = NULL; 1327 cd = *cdp; 1328 LIST_FOREACH(dev, &cd->head, si_clone) { 1329 KASSERT(dev->si_flags & SI_CLONELIST, 1330 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1331 u = dev2unit(dev); 1332 if (u == (unit | extra)) { 1333 *dp = dev; 1334 dev_unlock(); 1335 devfs_free(ndev); 1336 return (0); 1337 } 1338 if (unit == -1 && u == low) { 1339 low++; 1340 de = dev; 1341 continue; 1342 } else if (u < (unit | extra)) { 1343 de = dev; 1344 continue; 1345 } else if (u > (unit | extra)) { 1346 dl = dev; 1347 break; 1348 } 1349 } 1350 if (unit == -1) 1351 unit = low & CLONE_UNITMASK; 1352 make_dev_args_init(&args); 1353 args.mda_unit = unit | extra; 1354 args.mda_devsw = csw; 1355 dev = newdev(&args, ndev); 1356 if (dev->si_flags & SI_CLONELIST) { 1357 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 1358 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra); 1359 LIST_FOREACH(dev, &cd->head, si_clone) { 1360 printf("\t%p %s\n", dev, dev->si_name); 1361 } 1362 panic("foo"); 1363 } 1364 KASSERT(!(dev->si_flags & SI_CLONELIST), 1365 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 1366 if (dl != NULL) 1367 LIST_INSERT_BEFORE(dl, dev, si_clone); 1368 else if (de != NULL) 1369 LIST_INSERT_AFTER(de, dev, si_clone); 1370 else 1371 LIST_INSERT_HEAD(&cd->head, dev, si_clone); 1372 dev->si_flags |= SI_CLONELIST; 1373 *up = unit; 1374 dev_unlock_and_free(); 1375 return (1); 1376 } 1377 1378 /* 1379 * Kill everything still on the list. The driver should already have 1380 * disposed of any softc hung of the struct cdev *'s at this time. 1381 */ 1382 void 1383 clone_cleanup(struct clonedevs **cdp) 1384 { 1385 struct cdev *dev; 1386 struct cdev_priv *cp; 1387 struct clonedevs *cd; 1388 1389 cd = *cdp; 1390 if (cd == NULL) 1391 return; 1392 dev_lock(); 1393 while (!LIST_EMPTY(&cd->head)) { 1394 dev = LIST_FIRST(&cd->head); 1395 LIST_REMOVE(dev, si_clone); 1396 KASSERT(dev->si_flags & SI_CLONELIST, 1397 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1398 dev->si_flags &= ~SI_CLONELIST; 1399 cp = cdev2priv(dev); 1400 if (!(cp->cdp_flags & CDP_SCHED_DTR)) { 1401 cp->cdp_flags |= CDP_SCHED_DTR; 1402 KASSERT(dev->si_flags & SI_NAMED, 1403 ("Driver has goofed in cloning underways udev %jx unit %x", 1404 (uintmax_t)dev2udev(dev), dev2unit(dev))); 1405 destroy_devl(dev); 1406 } 1407 } 1408 dev_unlock_and_free(); 1409 free(cd, M_DEVBUF); 1410 *cdp = NULL; 1411 } 1412 1413 static TAILQ_HEAD(, cdev_priv) dev_ddtr = 1414 TAILQ_HEAD_INITIALIZER(dev_ddtr); 1415 static struct task dev_dtr_task = TASK_INITIALIZER(0, destroy_dev_tq, NULL); 1416 1417 static void 1418 destroy_dev_tq(void *ctx, int pending) 1419 { 1420 struct cdev_priv *cp; 1421 struct cdev *dev; 1422 void (*cb)(void *); 1423 void *cb_arg; 1424 1425 dev_lock(); 1426 while (!TAILQ_EMPTY(&dev_ddtr)) { 1427 cp = TAILQ_FIRST(&dev_ddtr); 1428 dev = &cp->cdp_c; 1429 KASSERT(cp->cdp_flags & CDP_SCHED_DTR, 1430 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp)); 1431 TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list); 1432 cb = cp->cdp_dtr_cb; 1433 cb_arg = cp->cdp_dtr_cb_arg; 1434 destroy_devl(dev); 1435 dev_unlock_and_free(); 1436 dev_rel(dev); 1437 if (cb != NULL) 1438 cb(cb_arg); 1439 dev_lock(); 1440 } 1441 dev_unlock(); 1442 } 1443 1444 /* 1445 * devmtx shall be locked on entry. devmtx will be unlocked after 1446 * function return. 1447 */ 1448 static int 1449 destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg) 1450 { 1451 struct cdev_priv *cp; 1452 1453 mtx_assert(&devmtx, MA_OWNED); 1454 cp = cdev2priv(dev); 1455 if (cp->cdp_flags & CDP_SCHED_DTR) { 1456 dev_unlock(); 1457 return (0); 1458 } 1459 dev_refl(dev); 1460 cp->cdp_flags |= CDP_SCHED_DTR; 1461 cp->cdp_dtr_cb = cb; 1462 cp->cdp_dtr_cb_arg = arg; 1463 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list); 1464 dev_unlock(); 1465 taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task); 1466 return (1); 1467 } 1468 1469 int 1470 destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg) 1471 { 1472 1473 dev_lock(); 1474 return (destroy_dev_sched_cbl(dev, cb, arg)); 1475 } 1476 1477 int 1478 destroy_dev_sched(struct cdev *dev) 1479 { 1480 1481 return (destroy_dev_sched_cb(dev, NULL, NULL)); 1482 } 1483 1484 void 1485 destroy_dev_drain(struct cdevsw *csw) 1486 { 1487 1488 dev_lock(); 1489 while (!LIST_EMPTY(&csw->d_devs)) { 1490 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10); 1491 } 1492 dev_unlock(); 1493 } 1494 1495 void 1496 drain_dev_clone_events(void) 1497 { 1498 1499 sx_xlock(&clone_drain_lock); 1500 sx_xunlock(&clone_drain_lock); 1501 } 1502 1503 #include "opt_ddb.h" 1504 #ifdef DDB 1505 #include <sys/kernel.h> 1506 1507 #include <ddb/ddb.h> 1508 1509 DB_SHOW_COMMAND(cdev, db_show_cdev) 1510 { 1511 struct cdev_priv *cdp; 1512 struct cdev *dev; 1513 u_int flags; 1514 char buf[512]; 1515 1516 if (!have_addr) { 1517 TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { 1518 dev = &cdp->cdp_c; 1519 db_printf("%s %p\n", dev->si_name, dev); 1520 if (db_pager_quit) 1521 break; 1522 } 1523 return; 1524 } 1525 1526 dev = (struct cdev *)addr; 1527 cdp = cdev2priv(dev); 1528 db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n", 1529 dev->si_name, dev->si_refcount, dev->si_usecount, 1530 dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first); 1531 db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n", 1532 dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2); 1533 flags = dev->si_flags; 1534 #define SI_FLAG(flag) do { \ 1535 if (flags & (flag)) { \ 1536 if (buf[0] != '\0') \ 1537 strlcat(buf, ", ", sizeof(buf)); \ 1538 strlcat(buf, (#flag) + 3, sizeof(buf)); \ 1539 flags &= ~(flag); \ 1540 } \ 1541 } while (0) 1542 buf[0] = '\0'; 1543 SI_FLAG(SI_ETERNAL); 1544 SI_FLAG(SI_ALIAS); 1545 SI_FLAG(SI_NAMED); 1546 SI_FLAG(SI_CHEAPCLONE); 1547 SI_FLAG(SI_CHILD); 1548 SI_FLAG(SI_DUMPDEV); 1549 SI_FLAG(SI_CLONELIST); 1550 db_printf("si_flags %s\n", buf); 1551 1552 flags = cdp->cdp_flags; 1553 #define CDP_FLAG(flag) do { \ 1554 if (flags & (flag)) { \ 1555 if (buf[0] != '\0') \ 1556 strlcat(buf, ", ", sizeof(buf)); \ 1557 strlcat(buf, (#flag) + 4, sizeof(buf)); \ 1558 flags &= ~(flag); \ 1559 } \ 1560 } while (0) 1561 buf[0] = '\0'; 1562 CDP_FLAG(CDP_ACTIVE); 1563 CDP_FLAG(CDP_SCHED_DTR); 1564 db_printf("cdp_flags %s\n", buf); 1565 } 1566 #endif
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