1/*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/param.h> 30#include <sys/kernel.h> 31#include <sys/systm.h> 32#include <sys/bio.h> 33#include <sys/devctl.h> 34#include <sys/lock.h> 35#include <sys/mutex.h> 36#include <sys/module.h> 37#include <sys/malloc.h> 38#include <sys/conf.h> 39#include <sys/vnode.h> 40#include <sys/queue.h> 41#include <sys/poll.h> 42#include <sys/sx.h> 43#include <sys/ctype.h> 44#include <sys/ucred.h> 45#include <sys/taskqueue.h> 46#include <machine/stdarg.h> 47 48#include <fs/devfs/devfs_int.h> 49#include <vm/vm.h> 50 51static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage"); 52 53struct mtx devmtx; 54static void destroy_devl(struct cdev *dev); 55static int destroy_dev_sched_cbl(struct cdev *dev, 56 void (*cb)(void *), void *arg); 57static void destroy_dev_tq(void *ctx, int pending); 58static void destroy_dev_tq_giant(void *ctx, int pending); 59static 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 63static struct cdev_priv_list cdevp_free_list = 64 TAILQ_HEAD_INITIALIZER(cdevp_free_list); 65static SLIST_HEAD(free_cdevsw, cdevsw) cdevsw_gt_post_list = 66 SLIST_HEAD_INITIALIZER(cdevsw_gt_post_list); 67 68void 69dev_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 */ 81static void 82dev_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 dev_lock_assert_locked(); 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 112static void 113dev_free_devlocked(struct cdev *cdev) 114{ 115 struct cdev_priv *cdp; 116 117 dev_lock_assert_locked(); 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 KASSERT((cdp->cdp_flags & CDP_ON_ACTIVE_LIST) == 0, 122 ("%s: cdp %p (%s) on active list", __func__, cdp, cdev->si_name)); 123 TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list); 124} 125 126static void 127cdevsw_free_devlocked(struct cdevsw *csw) 128{ 129 130 dev_lock_assert_locked(); 131 SLIST_INSERT_HEAD(&cdevsw_gt_post_list, csw, d_postfree_list); 132} 133 134void 135dev_unlock(void) 136{ 137 138 mtx_unlock(&devmtx); 139} 140 141void 142dev_ref(struct cdev *dev) 143{ 144 145 dev_lock_assert_unlocked(); 146 mtx_lock(&devmtx); 147 dev->si_refcount++; 148 mtx_unlock(&devmtx); 149} 150 151void 152dev_refl(struct cdev *dev) 153{ 154 155 dev_lock_assert_locked(); 156 dev->si_refcount++; 157} 158 159void 160dev_rel(struct cdev *dev) 161{ 162 int flag = 0; 163 164 dev_lock_assert_unlocked(); 165 dev_lock(); 166 dev->si_refcount--; 167 KASSERT(dev->si_refcount >= 0, 168 ("dev_rel(%s) gave negative count", devtoname(dev))); 169 if (dev->si_devsw == NULL && dev->si_refcount == 0) { 170 LIST_REMOVE(dev, si_list); 171 flag = 1; 172 } 173 dev_unlock(); 174 if (flag) 175 devfs_free(dev); 176} 177 178struct cdevsw * 179dev_refthread(struct cdev *dev, int *ref) 180{ 181 struct cdevsw *csw; 182 struct cdev_priv *cdp; 183 184 dev_lock_assert_unlocked(); 185 if ((dev->si_flags & SI_ETERNAL) != 0) { 186 *ref = 0; 187 return (dev->si_devsw); 188 } 189 cdp = cdev2priv(dev); 190 mtx_lock(&cdp->cdp_threadlock); 191 csw = dev->si_devsw; 192 if (csw != NULL) { 193 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) 194 atomic_add_long(&dev->si_threadcount, 1); 195 else 196 csw = NULL; 197 } 198 mtx_unlock(&cdp->cdp_threadlock); 199 if (csw != NULL) 200 *ref = 1; 201 return (csw); 202} 203 204struct cdevsw * 205devvn_refthread(struct vnode *vp, struct cdev **devp, int *ref) 206{ 207 struct cdevsw *csw; 208 struct cdev_priv *cdp; 209 struct cdev *dev; 210 211 dev_lock_assert_unlocked(); 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 VI_LOCK(vp); 227 dev = vp->v_rdev; 228 if (dev == NULL) { 229 VI_UNLOCK(vp); 230 return (NULL); 231 } 232 cdp = cdev2priv(dev); 233 mtx_lock(&cdp->cdp_threadlock); 234 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) { 235 csw = dev->si_devsw; 236 if (csw != NULL) 237 atomic_add_long(&dev->si_threadcount, 1); 238 } 239 mtx_unlock(&cdp->cdp_threadlock); 240 VI_UNLOCK(vp); 241 if (csw != NULL) { 242 *devp = dev; 243 *ref = 1; 244 } 245 return (csw); 246} 247 248void 249dev_relthread(struct cdev *dev, int ref) 250{ 251 252 dev_lock_assert_unlocked(); 253 if (!ref) 254 return; 255 KASSERT(dev->si_threadcount > 0, 256 ("%s threadcount is wrong", dev->si_name)); 257 atomic_subtract_rel_long(&dev->si_threadcount, 1); 258} 259 260int 261nullop(void) 262{ 263 264 return (0); 265} 266 267int 268eopnotsupp(void) 269{ 270 271 return (EOPNOTSUPP); 272} 273 274static int 275enxio(void) 276{ 277 return (ENXIO); 278} 279 280static int 281enodev(void) 282{ 283 return (ENODEV); 284} 285 286/* Define a dead_cdevsw for use when devices leave unexpectedly. */ 287 288#define dead_open (d_open_t *)enxio 289#define dead_close (d_close_t *)enxio 290#define dead_read (d_read_t *)enxio 291#define dead_write (d_write_t *)enxio 292#define dead_ioctl (d_ioctl_t *)enxio 293#define dead_poll (d_poll_t *)enodev 294#define dead_mmap (d_mmap_t *)enodev 295 296static void 297dead_strategy(struct bio *bp) 298{ 299 300 biofinish(bp, NULL, ENXIO); 301} 302 303#define dead_kqfilter (d_kqfilter_t *)enxio 304#define dead_mmap_single (d_mmap_single_t *)enodev 305 306static struct cdevsw dead_cdevsw = { 307 .d_version = D_VERSION, 308 .d_open = dead_open, 309 .d_close = dead_close, 310 .d_read = dead_read, 311 .d_write = dead_write, 312 .d_ioctl = dead_ioctl, 313 .d_poll = dead_poll, 314 .d_mmap = dead_mmap, 315 .d_strategy = dead_strategy, 316 .d_name = "dead", 317 .d_kqfilter = dead_kqfilter, 318 .d_mmap_single = dead_mmap_single 319}; 320 321/* Default methods if driver does not specify method */ 322 323#define null_open (d_open_t *)nullop 324#define null_close (d_close_t *)nullop 325#define no_read (d_read_t *)enodev 326#define no_write (d_write_t *)enodev 327#define no_ioctl (d_ioctl_t *)enodev 328#define no_mmap (d_mmap_t *)enodev 329#define no_kqfilter (d_kqfilter_t *)enodev 330#define no_mmap_single (d_mmap_single_t *)enodev 331 332static void 333no_strategy(struct bio *bp) 334{ 335 336 biofinish(bp, NULL, ENODEV); 337} 338 339static int 340no_poll(struct cdev *dev __unused, int events, struct thread *td __unused) 341{ 342 343 return (poll_no_poll(events)); 344} 345 346static int 347giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 348{ 349 struct cdevsw *dsw; 350 int ref, retval; 351 352 dsw = dev_refthread(dev, &ref); 353 if (dsw == NULL) 354 return (ENXIO); 355 mtx_lock(&Giant); 356 retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td); 357 mtx_unlock(&Giant); 358 dev_relthread(dev, ref); 359 return (retval); 360} 361 362static int 363giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp) 364{ 365 struct cdevsw *dsw; 366 int ref, retval; 367 368 dsw = dev_refthread(dev, &ref); 369 if (dsw == NULL) 370 return (ENXIO); 371 mtx_lock(&Giant); 372 retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp); 373 mtx_unlock(&Giant); 374 dev_relthread(dev, ref); 375 return (retval); 376} 377 378static int 379giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 380{ 381 struct cdevsw *dsw; 382 int ref, retval; 383 384 dsw = dev_refthread(dev, &ref); 385 if (dsw == NULL) 386 return (ENXIO); 387 mtx_lock(&Giant); 388 retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td); 389 mtx_unlock(&Giant); 390 dev_relthread(dev, ref); 391 return (retval); 392} 393 394static void 395giant_strategy(struct bio *bp) 396{ 397 struct cdevsw *dsw; 398 struct cdev *dev; 399 int ref; 400 401 dev = bp->bio_dev; 402 dsw = dev_refthread(dev, &ref); 403 if (dsw == NULL) { 404 biofinish(bp, NULL, ENXIO); 405 return; 406 } 407 mtx_lock(&Giant); 408 dsw->d_gianttrick->d_strategy(bp); 409 mtx_unlock(&Giant); 410 dev_relthread(dev, ref); 411} 412 413static int 414giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 415{ 416 struct cdevsw *dsw; 417 int ref, retval; 418 419 dsw = dev_refthread(dev, &ref); 420 if (dsw == NULL) 421 return (ENXIO); 422 mtx_lock(&Giant); 423 retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td); 424 mtx_unlock(&Giant); 425 dev_relthread(dev, ref); 426 return (retval); 427} 428 429static int 430giant_read(struct cdev *dev, struct uio *uio, int ioflag) 431{ 432 struct cdevsw *dsw; 433 int ref, retval; 434 435 dsw = dev_refthread(dev, &ref); 436 if (dsw == NULL) 437 return (ENXIO); 438 mtx_lock(&Giant); 439 retval = dsw->d_gianttrick->d_read(dev, uio, ioflag); 440 mtx_unlock(&Giant); 441 dev_relthread(dev, ref); 442 return (retval); 443} 444 445static int 446giant_write(struct cdev *dev, struct uio *uio, int ioflag) 447{ 448 struct cdevsw *dsw; 449 int ref, retval; 450 451 dsw = dev_refthread(dev, &ref); 452 if (dsw == NULL) 453 return (ENXIO); 454 mtx_lock(&Giant); 455 retval = dsw->d_gianttrick->d_write(dev, uio, ioflag); 456 mtx_unlock(&Giant); 457 dev_relthread(dev, ref); 458 return (retval); 459} 460 461static int 462giant_poll(struct cdev *dev, int events, struct thread *td) 463{ 464 struct cdevsw *dsw; 465 int ref, retval; 466 467 dsw = dev_refthread(dev, &ref); 468 if (dsw == NULL) 469 return (ENXIO); 470 mtx_lock(&Giant); 471 retval = dsw->d_gianttrick->d_poll(dev, events, td); 472 mtx_unlock(&Giant); 473 dev_relthread(dev, ref); 474 return (retval); 475} 476 477static int 478giant_kqfilter(struct cdev *dev, struct knote *kn) 479{ 480 struct cdevsw *dsw; 481 int ref, retval; 482 483 dsw = dev_refthread(dev, &ref); 484 if (dsw == NULL) 485 return (ENXIO); 486 mtx_lock(&Giant); 487 retval = dsw->d_gianttrick->d_kqfilter(dev, kn); 488 mtx_unlock(&Giant); 489 dev_relthread(dev, ref); 490 return (retval); 491} 492 493static int 494giant_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot, 495 vm_memattr_t *memattr) 496{ 497 struct cdevsw *dsw; 498 int ref, retval; 499 500 dsw = dev_refthread(dev, &ref); 501 if (dsw == NULL) 502 return (ENXIO); 503 mtx_lock(&Giant); 504 retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot, 505 memattr); 506 mtx_unlock(&Giant); 507 dev_relthread(dev, ref); 508 return (retval); 509} 510 511static int 512giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size, 513 vm_object_t *object, int nprot) 514{ 515 struct cdevsw *dsw; 516 int ref, retval; 517 518 dsw = dev_refthread(dev, &ref); 519 if (dsw == NULL) 520 return (ENXIO); 521 mtx_lock(&Giant); 522 retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object, 523 nprot); 524 mtx_unlock(&Giant); 525 dev_relthread(dev, ref); 526 return (retval); 527} 528 529static void 530notify(struct cdev *dev, const char *ev, int flags) 531{ 532 static const char prefix[] = "cdev="; 533 char *data; 534 int namelen, mflags; 535 536 if (cold) 537 return; 538 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; 539 namelen = strlen(dev->si_name); 540 data = malloc(namelen + sizeof(prefix), M_TEMP, mflags); 541 if (data == NULL) 542 return; 543 memcpy(data, prefix, sizeof(prefix) - 1); 544 memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1); 545 devctl_notify("DEVFS", "CDEV", ev, data); 546 free(data, M_TEMP); 547} 548 549static void 550notify_create(struct cdev *dev, int flags) 551{ 552 553 notify(dev, "CREATE", flags); 554} 555 556static void 557notify_destroy(struct cdev *dev) 558{ 559 560 notify(dev, "DESTROY", MAKEDEV_WAITOK); 561} 562 563static struct cdev * 564newdev(struct make_dev_args *args, struct cdev *si) 565{ 566 struct cdev *si2; 567 struct cdevsw *csw; 568 569 dev_lock_assert_locked(); 570 csw = args->mda_devsw; 571 si2 = NULL; 572 if (csw->d_flags & D_NEEDMINOR) { 573 /* We may want to return an existing device */ 574 LIST_FOREACH(si2, &csw->d_devs, si_list) { 575 if (dev2unit(si2) == args->mda_unit) { 576 dev_free_devlocked(si); 577 si = si2; 578 break; 579 } 580 } 581 582 /* 583 * If we're returning an existing device, we should make sure 584 * it isn't already initialized. This would have been caught 585 * in consumers anyways, but it's good to catch such a case 586 * early. We still need to complete initialization of the 587 * device, and we'll use whatever make_dev_args were passed in 588 * to do so. 589 */ 590 KASSERT(si2 == NULL || (si2->si_flags & SI_NAMED) == 0, 591 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", 592 args->mda_devsw->d_name, dev2unit(si2), devtoname(si2))); 593 } 594 si->si_drv0 = args->mda_unit; 595 si->si_drv1 = args->mda_si_drv1; 596 si->si_drv2 = args->mda_si_drv2; 597 /* Only push to csw->d_devs if it's not a cloned device. */ 598 if (si2 == NULL) { 599 si->si_devsw = csw; 600 LIST_INSERT_HEAD(&csw->d_devs, si, si_list); 601 } else { 602 KASSERT(si->si_devsw == csw, 603 ("%s: inconsistent devsw between clone_create() and make_dev()", 604 __func__)); 605 } 606 return (si); 607} 608 609static void 610fini_cdevsw(struct cdevsw *devsw) 611{ 612 struct cdevsw *gt; 613 614 if (devsw->d_gianttrick != NULL) { 615 gt = devsw->d_gianttrick; 616 memcpy(devsw, gt, sizeof *devsw); 617 cdevsw_free_devlocked(gt); 618 devsw->d_gianttrick = NULL; 619 } 620 devsw->d_flags &= ~D_INIT; 621} 622 623static int 624prep_cdevsw(struct cdevsw *devsw, int flags) 625{ 626 struct cdevsw *dsw2; 627 628 dev_lock_assert_locked(); 629 if (devsw->d_flags & D_INIT) 630 return (0); 631 if (devsw->d_flags & D_NEEDGIANT) { 632 dev_unlock(); 633 dsw2 = malloc(sizeof *dsw2, M_DEVT, 634 (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK); 635 dev_lock(); 636 if (dsw2 == NULL && !(devsw->d_flags & D_INIT)) 637 return (ENOMEM); 638 } else 639 dsw2 = NULL; 640 if (devsw->d_flags & D_INIT) { 641 if (dsw2 != NULL) 642 cdevsw_free_devlocked(dsw2); 643 return (0); 644 } 645 646 if (devsw->d_version != D_VERSION_04) { 647 printf( 648 "WARNING: Device driver \"%s\" has wrong version %s\n", 649 devsw->d_name == NULL ? "???" : devsw->d_name, 650 "and is disabled. Recompile KLD module."); 651 devsw->d_open = dead_open; 652 devsw->d_close = dead_close; 653 devsw->d_read = dead_read; 654 devsw->d_write = dead_write; 655 devsw->d_ioctl = dead_ioctl; 656 devsw->d_poll = dead_poll; 657 devsw->d_mmap = dead_mmap; 658 devsw->d_mmap_single = dead_mmap_single; 659 devsw->d_strategy = dead_strategy; 660 devsw->d_kqfilter = dead_kqfilter; 661 } 662 663 if ((devsw->d_flags & D_NEEDGIANT) != 0) { 664 if ((devsw->d_flags & D_GIANTOK) == 0) { 665 printf( 666 "WARNING: Device \"%s\" is Giant locked and may be " 667 "deleted before FreeBSD 15.0.\n", 668 devsw->d_name == NULL ? "???" : devsw->d_name); 669 } 670 if (devsw->d_gianttrick == NULL) { 671 memcpy(dsw2, devsw, sizeof *dsw2); 672 devsw->d_gianttrick = dsw2; 673 dsw2 = NULL; 674 } 675 } 676 677#define FIXUP(member, noop, giant) \ 678 do { \ 679 if (devsw->member == NULL) { \ 680 devsw->member = noop; \ 681 } else if (devsw->d_flags & D_NEEDGIANT) \ 682 devsw->member = giant; \ 683 } \ 684 while (0) 685 686 FIXUP(d_open, null_open, giant_open); 687 FIXUP(d_fdopen, NULL, giant_fdopen); 688 FIXUP(d_close, null_close, giant_close); 689 FIXUP(d_read, no_read, giant_read); 690 FIXUP(d_write, no_write, giant_write); 691 FIXUP(d_ioctl, no_ioctl, giant_ioctl); 692 FIXUP(d_poll, no_poll, giant_poll); 693 FIXUP(d_mmap, no_mmap, giant_mmap); 694 FIXUP(d_strategy, no_strategy, giant_strategy); 695 FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter); 696 FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single); 697 698 LIST_INIT(&devsw->d_devs); 699 700 devsw->d_flags |= D_INIT; 701 702 if (dsw2 != NULL) 703 cdevsw_free_devlocked(dsw2); 704 return (0); 705} 706 707static int 708prep_devname(struct cdev *dev, const char *fmt, va_list ap) 709{ 710 int len; 711 char *from, *q, *s, *to; 712 713 dev_lock_assert_locked(); 714 715 len = vsnrprintf(dev->si_name, sizeof(dev->si_name), 32, fmt, ap); 716 if (len > sizeof(dev->si_name) - 1) 717 return (ENAMETOOLONG); 718 719 /* Strip leading slashes. */ 720 for (from = dev->si_name; *from == '/'; from++) 721 ; 722 723 for (to = dev->si_name; *from != '\0'; from++, to++) { 724 /* 725 * Spaces and double quotation marks cause 726 * problems for the devctl(4) protocol. 727 * Reject names containing those characters. 728 */ 729 if (isspace(*from) || *from == '"') 730 return (EINVAL); 731 /* Treat multiple sequential slashes as single. */ 732 while (from[0] == '/' && from[1] == '/') 733 from++; 734 /* Trailing slash is considered invalid. */ 735 if (from[0] == '/' && from[1] == '\0') 736 return (EINVAL); 737 *to = *from; 738 } 739 *to = '\0'; 740 741 if (dev->si_name[0] == '\0') 742 return (EINVAL); 743 744 /* Disallow "." and ".." components. */ 745 for (s = dev->si_name;;) { 746 for (q = s; *q != '/' && *q != '\0'; q++) 747 ; 748 if (q - s == 1 && s[0] == '.') 749 return (EINVAL); 750 if (q - s == 2 && s[0] == '.' && s[1] == '.') 751 return (EINVAL); 752 if (*q != '/') 753 break; 754 s = q + 1; 755 } 756 757 if (devfs_dev_exists(dev->si_name) != 0) 758 return (EEXIST); 759 760 return (0); 761} 762 763void 764make_dev_args_init_impl(struct make_dev_args *args, size_t sz) 765{ 766 767 bzero(args, sz); 768 args->mda_size = sz; 769} 770 771static int 772make_dev_sv(struct make_dev_args *args1, struct cdev **dres, 773 const char *fmt, va_list ap) 774{ 775 struct cdev *dev, *dev_new; 776 struct make_dev_args args; 777 int res; 778 779 bzero(&args, sizeof(args)); 780 if (sizeof(args) < args1->mda_size) 781 return (EINVAL); 782 bcopy(args1, &args, args1->mda_size); 783 KASSERT((args.mda_flags & MAKEDEV_WAITOK) == 0 || 784 (args.mda_flags & MAKEDEV_NOWAIT) == 0, 785 ("make_dev_sv: both WAITOK and NOWAIT specified")); 786 dev_new = devfs_alloc(args.mda_flags); 787 if (dev_new == NULL) 788 return (ENOMEM); 789 dev_lock(); 790 res = prep_cdevsw(args.mda_devsw, args.mda_flags); 791 if (res != 0) { 792 dev_unlock(); 793 devfs_free(dev_new); 794 return (res); 795 } 796 dev = newdev(&args, dev_new); 797 if ((dev->si_flags & SI_NAMED) == 0) { 798 res = prep_devname(dev, fmt, ap); 799 if (res != 0) { 800 if ((args.mda_flags & MAKEDEV_CHECKNAME) == 0) { 801 panic( 802 "make_dev_sv: bad si_name (error=%d, si_name=%s)", 803 res, dev->si_name); 804 } 805 if (dev == dev_new) { 806 LIST_REMOVE(dev, si_list); 807 dev_unlock(); 808 devfs_free(dev); 809 } else 810 dev_unlock(); 811 return (res); 812 } 813 } 814 if ((args.mda_flags & MAKEDEV_REF) != 0) 815 dev_refl(dev); 816 if ((args.mda_flags & MAKEDEV_ETERNAL) != 0) 817 dev->si_flags |= SI_ETERNAL; 818 KASSERT(!(dev->si_flags & SI_NAMED), 819 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", 820 args.mda_devsw->d_name, dev2unit(dev), devtoname(dev))); 821 dev->si_flags |= SI_NAMED; 822 if (args.mda_cr != NULL) 823 dev->si_cred = crhold(args.mda_cr); 824 dev->si_uid = args.mda_uid; 825 dev->si_gid = args.mda_gid; 826 dev->si_mode = args.mda_mode; 827 828 devfs_create(dev); 829 clean_unrhdrl(devfs_inos); 830 dev_unlock_and_free(); 831 832 notify_create(dev, args.mda_flags); 833 834 *dres = dev; 835 return (0); 836} 837 838int 839make_dev_s(struct make_dev_args *args, struct cdev **dres, 840 const char *fmt, ...) 841{ 842 va_list ap; 843 int res; 844 845 va_start(ap, fmt); 846 res = make_dev_sv(args, dres, fmt, ap); 847 va_end(ap); 848 return (res); 849} 850 851static int 852make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit, 853 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 854 va_list ap) 855{ 856 struct make_dev_args args; 857 858 make_dev_args_init(&args); 859 args.mda_flags = flags; 860 args.mda_devsw = devsw; 861 args.mda_cr = cr; 862 args.mda_uid = uid; 863 args.mda_gid = gid; 864 args.mda_mode = mode; 865 args.mda_unit = unit; 866 return (make_dev_sv(&args, dres, fmt, ap)); 867} 868 869struct cdev * 870make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode, 871 const char *fmt, ...) 872{ 873 struct cdev *dev; 874 va_list ap; 875 int res __unused; 876 877 va_start(ap, fmt); 878 res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt, 879 ap); 880 va_end(ap); 881 KASSERT(res == 0 && dev != NULL, 882 ("make_dev: failed make_dev_credv (error=%d)", res)); 883 return (dev); 884} 885 886struct cdev * 887make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid, 888 gid_t gid, int mode, const char *fmt, ...) 889{ 890 struct cdev *dev; 891 va_list ap; 892 int res __unused; 893 894 va_start(ap, fmt); 895 res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap); 896 va_end(ap); 897 898 KASSERT(res == 0 && dev != NULL, 899 ("make_dev_cred: failed make_dev_credv (error=%d)", res)); 900 return (dev); 901} 902 903struct cdev * 904make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr, 905 uid_t uid, gid_t gid, int mode, const char *fmt, ...) 906{ 907 struct cdev *dev; 908 va_list ap; 909 int res; 910 911 va_start(ap, fmt); 912 res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode, 913 fmt, ap); 914 va_end(ap); 915 916 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 917 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 918 ("make_dev_credf: failed make_dev_credv (error=%d)", res)); 919 return (res == 0 ? dev : NULL); 920} 921 922int 923make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw, 924 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...) 925{ 926 va_list ap; 927 int res; 928 929 va_start(ap, fmt); 930 res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode, 931 fmt, ap); 932 va_end(ap); 933 934 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 935 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 936 ("make_dev_p: failed make_dev_credv (error=%d)", res)); 937 return (res); 938} 939 940static void 941dev_dependsl(struct cdev *pdev, struct cdev *cdev) 942{ 943 944 cdev->si_parent = pdev; 945 cdev->si_flags |= SI_CHILD; 946 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 947} 948 949void 950dev_depends(struct cdev *pdev, struct cdev *cdev) 951{ 952 953 dev_lock(); 954 dev_dependsl(pdev, cdev); 955 dev_unlock(); 956} 957 958static int 959make_dev_alias_v(int flags, struct cdev **cdev, struct cdev *pdev, 960 const char *fmt, va_list ap) 961{ 962 struct cdev *dev; 963 int error; 964 965 KASSERT(pdev != NULL, ("make_dev_alias_v: pdev is NULL")); 966 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, 967 ("make_dev_alias_v: both WAITOK and NOWAIT specified")); 968 KASSERT((flags & ~(MAKEDEV_WAITOK | MAKEDEV_NOWAIT | 969 MAKEDEV_CHECKNAME)) == 0, 970 ("make_dev_alias_v: invalid flags specified (flags=%02x)", flags)); 971 972 dev = devfs_alloc(flags); 973 if (dev == NULL) 974 return (ENOMEM); 975 dev_lock(); 976 dev->si_flags |= SI_ALIAS; 977 error = prep_devname(dev, fmt, ap); 978 if (error != 0) { 979 if ((flags & MAKEDEV_CHECKNAME) == 0) { 980 panic("make_dev_alias_v: bad si_name " 981 "(error=%d, si_name=%s)", error, dev->si_name); 982 } 983 dev_unlock(); 984 devfs_free(dev); 985 return (error); 986 } 987 dev->si_flags |= SI_NAMED; 988 devfs_create(dev); 989 dev_dependsl(pdev, dev); 990 clean_unrhdrl(devfs_inos); 991 dev_unlock(); 992 993 notify_create(dev, flags); 994 *cdev = dev; 995 996 return (0); 997} 998 999struct cdev * 1000make_dev_alias(struct cdev *pdev, const char *fmt, ...) 1001{ 1002 struct cdev *dev; 1003 va_list ap; 1004 int res __unused; 1005 1006 va_start(ap, fmt); 1007 res = make_dev_alias_v(MAKEDEV_WAITOK, &dev, pdev, fmt, ap); 1008 va_end(ap); 1009 1010 KASSERT(res == 0 && dev != NULL, 1011 ("make_dev_alias: failed make_dev_alias_v (error=%d)", res)); 1012 return (dev); 1013} 1014 1015int 1016make_dev_alias_p(int flags, struct cdev **cdev, struct cdev *pdev, 1017 const char *fmt, ...) 1018{ 1019 va_list ap; 1020 int res; 1021 1022 va_start(ap, fmt); 1023 res = make_dev_alias_v(flags, cdev, pdev, fmt, ap); 1024 va_end(ap); 1025 return (res); 1026} 1027 1028int 1029make_dev_physpath_alias(int flags, struct cdev **cdev, struct cdev *pdev, 1030 struct cdev *old_alias, const char *physpath) 1031{ 1032 char *devfspath; 1033 int physpath_len; 1034 int max_parentpath_len; 1035 int parentpath_len; 1036 int devfspathbuf_len; 1037 int mflags; 1038 int ret; 1039 1040 *cdev = NULL; 1041 devfspath = NULL; 1042 physpath_len = strlen(physpath); 1043 ret = EINVAL; 1044 if (physpath_len == 0) 1045 goto out; 1046 1047 if (strncmp("id1,", physpath, 4) == 0) { 1048 physpath += 4; 1049 physpath_len -= 4; 1050 if (physpath_len == 0) 1051 goto out; 1052 } 1053 1054 max_parentpath_len = SPECNAMELEN - physpath_len - /*/*/1; 1055 parentpath_len = strlen(pdev->si_name); 1056 if (max_parentpath_len < parentpath_len) { 1057 if (bootverbose) 1058 printf("WARNING: Unable to alias %s " 1059 "to %s/%s - path too long\n", 1060 pdev->si_name, physpath, pdev->si_name); 1061 ret = ENAMETOOLONG; 1062 goto out; 1063 } 1064 1065 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; 1066 devfspathbuf_len = physpath_len + /*/*/1 + parentpath_len + /*NUL*/1; 1067 devfspath = malloc(devfspathbuf_len, M_DEVBUF, mflags); 1068 if (devfspath == NULL) { 1069 ret = ENOMEM; 1070 goto out; 1071 } 1072 1073 sprintf(devfspath, "%s/%s", physpath, pdev->si_name); 1074 if (old_alias != NULL && strcmp(old_alias->si_name, devfspath) == 0) { 1075 /* Retain the existing alias. */ 1076 *cdev = old_alias; 1077 old_alias = NULL; 1078 ret = 0; 1079 } else { 1080 ret = make_dev_alias_p(flags, cdev, pdev, "%s", devfspath); 1081 } 1082out: 1083 if (old_alias != NULL) 1084 destroy_dev(old_alias); 1085 if (devfspath != NULL) 1086 free(devfspath, M_DEVBUF); 1087 return (ret); 1088} 1089 1090static void 1091destroy_devl(struct cdev *dev) 1092{ 1093 struct cdevsw *csw; 1094 struct cdev_privdata *p; 1095 struct cdev_priv *cdp; 1096 1097 dev_lock_assert_locked(); 1098 KASSERT(dev->si_flags & SI_NAMED, 1099 ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev))); 1100 KASSERT((dev->si_flags & SI_ETERNAL) == 0, 1101 ("WARNING: Driver mistake: destroy_dev on eternal %d\n", 1102 dev2unit(dev))); 1103 1104 cdp = cdev2priv(dev); 1105 if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) { 1106 /* 1107 * Avoid race with dev_rel(), e.g. from the populate 1108 * loop. If CDP_UNREF_DTR flag is set, the reference 1109 * to be dropped at the end of destroy_devl() was 1110 * already taken by delist_dev_locked(). 1111 */ 1112 dev_refl(dev); 1113 1114 devfs_destroy(dev); 1115 } 1116 1117 /* Remove name marking */ 1118 dev->si_flags &= ~SI_NAMED; 1119 1120 /* If we are a child, remove us from the parents list */ 1121 if (dev->si_flags & SI_CHILD) { 1122 LIST_REMOVE(dev, si_siblings); 1123 dev->si_flags &= ~SI_CHILD; 1124 } 1125 1126 /* Kill our children */ 1127 while (!LIST_EMPTY(&dev->si_children)) 1128 destroy_devl(LIST_FIRST(&dev->si_children)); 1129 1130 /* Remove from clone list */ 1131 if (dev->si_flags & SI_CLONELIST) { 1132 LIST_REMOVE(dev, si_clone); 1133 dev->si_flags &= ~SI_CLONELIST; 1134 } 1135 1136 mtx_lock(&cdp->cdp_threadlock); 1137 csw = dev->si_devsw; 1138 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 1139 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 1140 csw->d_purge(dev); 1141 mtx_unlock(&cdp->cdp_threadlock); 1142 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 1143 mtx_lock(&cdp->cdp_threadlock); 1144 if (dev->si_threadcount) 1145 printf("Still %lu threads in %s\n", 1146 dev->si_threadcount, devtoname(dev)); 1147 } 1148 while (dev->si_threadcount != 0) { 1149 /* Use unique dummy wait ident */ 1150 mtx_unlock(&cdp->cdp_threadlock); 1151 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10); 1152 mtx_lock(&cdp->cdp_threadlock); 1153 } 1154 1155 mtx_unlock(&cdp->cdp_threadlock); 1156 dev_unlock(); 1157 if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) { 1158 /* avoid out of order notify events */ 1159 notify_destroy(dev); 1160 } 1161 mtx_lock(&cdevpriv_mtx); 1162 while ((p = LIST_FIRST(&cdp->cdp_fdpriv)) != NULL) { 1163 devfs_destroy_cdevpriv(p); 1164 mtx_lock(&cdevpriv_mtx); 1165 } 1166 mtx_unlock(&cdevpriv_mtx); 1167 dev_lock(); 1168 1169 dev->si_drv1 = 0; 1170 dev->si_drv2 = 0; 1171 1172 if (!(dev->si_flags & SI_ALIAS)) { 1173 /* Remove from cdevsw list */ 1174 LIST_REMOVE(dev, si_list); 1175 1176 /* If cdevsw has no more struct cdev *'s, clean it */ 1177 if (LIST_EMPTY(&csw->d_devs)) { 1178 fini_cdevsw(csw); 1179 wakeup(&csw->d_devs); 1180 } 1181 } 1182 dev->si_flags &= ~SI_ALIAS; 1183 cdp->cdp_flags &= ~CDP_UNREF_DTR; 1184 dev->si_refcount--; 1185 1186 if (dev->si_refcount > 0) 1187 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 1188 else 1189 dev_free_devlocked(dev); 1190} 1191 1192static void 1193delist_dev_locked(struct cdev *dev) 1194{ 1195 struct cdev_priv *cdp; 1196 struct cdev *child; 1197 1198 dev_lock_assert_locked(); 1199 cdp = cdev2priv(dev); 1200 if ((cdp->cdp_flags & CDP_UNREF_DTR) != 0) 1201 return; 1202 cdp->cdp_flags |= CDP_UNREF_DTR; 1203 dev_refl(dev); 1204 devfs_destroy(dev); 1205 LIST_FOREACH(child, &dev->si_children, si_siblings) 1206 delist_dev_locked(child); 1207 dev_unlock(); 1208 /* ensure the destroy event is queued in order */ 1209 notify_destroy(dev); 1210 dev_lock(); 1211} 1212 1213/* 1214 * This function will delist a character device and its children from 1215 * the directory listing and create a destroy event without waiting 1216 * for all character device references to go away. At some later point 1217 * destroy_dev() must be called to complete the character device 1218 * destruction. After calling this function the character device name 1219 * can instantly be re-used. 1220 */ 1221void 1222delist_dev(struct cdev *dev) 1223{ 1224 1225 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "delist_dev"); 1226 dev_lock(); 1227 delist_dev_locked(dev); 1228 dev_unlock(); 1229} 1230 1231void 1232destroy_dev(struct cdev *dev) 1233{ 1234 1235 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev"); 1236 dev_lock(); 1237 destroy_devl(dev); 1238 dev_unlock_and_free(); 1239} 1240 1241const char * 1242devtoname(struct cdev *dev) 1243{ 1244 1245 return (dev->si_name); 1246} 1247 1248int 1249dev_stdclone(char *name, char **namep, const char *stem, int *unit) 1250{ 1251 int u, i; 1252 1253 i = strlen(stem); 1254 if (strncmp(stem, name, i) != 0) 1255 return (0); 1256 if (!isdigit(name[i])) 1257 return (0); 1258 u = 0; 1259 if (name[i] == '0' && isdigit(name[i+1])) 1260 return (0); 1261 while (isdigit(name[i])) { 1262 u *= 10; 1263 u += name[i++] - '0'; 1264 } 1265 if (u > 0xffffff) 1266 return (0); 1267 *unit = u; 1268 if (namep) 1269 *namep = &name[i]; 1270 if (name[i]) 1271 return (2); 1272 return (1); 1273} 1274 1275/* 1276 * Helper functions for cloning device drivers. 1277 * 1278 * The objective here is to make it unnecessary for the device drivers to 1279 * use rman or similar to manage their unit number space. Due to the way 1280 * we do "on-demand" devices, using rman or other "private" methods 1281 * will be very tricky to lock down properly once we lock down this file. 1282 * 1283 * Instead we give the drivers these routines which puts the struct cdev *'s 1284 * that are to be managed on their own list, and gives the driver the ability 1285 * to ask for the first free unit number or a given specified unit number. 1286 * 1287 * In addition these routines support paired devices (pty, nmdm and similar) 1288 * by respecting a number of "flag" bits in the minor number. 1289 * 1290 */ 1291 1292struct clonedevs { 1293 LIST_HEAD(,cdev) head; 1294}; 1295 1296void 1297clone_setup(struct clonedevs **cdp) 1298{ 1299 1300 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 1301 LIST_INIT(&(*cdp)->head); 1302} 1303 1304int 1305clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, 1306 struct cdev **dp, int extra) 1307{ 1308 struct clonedevs *cd; 1309 struct cdev *dev, *ndev, *dl, *de; 1310 struct make_dev_args args; 1311 int unit, low, u; 1312 1313 KASSERT(*cdp != NULL, 1314 ("clone_setup() not called in driver \"%s\"", csw->d_name)); 1315 KASSERT(!(extra & CLONE_UNITMASK), 1316 ("Illegal extra bits (0x%x) in clone_create", extra)); 1317 KASSERT(*up <= CLONE_UNITMASK, 1318 ("Too high unit (0x%x) in clone_create", *up)); 1319 KASSERT(csw->d_flags & D_NEEDMINOR, 1320 ("clone_create() on cdevsw without minor numbers")); 1321 1322 /* 1323 * Search the list for a lot of things in one go: 1324 * A preexisting match is returned immediately. 1325 * The lowest free unit number if we are passed -1, and the place 1326 * in the list where we should insert that new element. 1327 * The place to insert a specified unit number, if applicable 1328 * the end of the list. 1329 */ 1330 unit = *up; 1331 ndev = devfs_alloc(MAKEDEV_WAITOK); 1332 dev_lock(); 1333 prep_cdevsw(csw, MAKEDEV_WAITOK); 1334 low = extra; 1335 de = dl = NULL; 1336 cd = *cdp; 1337 LIST_FOREACH(dev, &cd->head, si_clone) { 1338 KASSERT(dev->si_flags & SI_CLONELIST, 1339 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1340 u = dev2unit(dev); 1341 if (u == (unit | extra)) { 1342 *dp = dev; 1343 dev_unlock(); 1344 devfs_free(ndev); 1345 return (0); 1346 } 1347 if (unit == -1 && u == low) { 1348 low++; 1349 de = dev; 1350 continue; 1351 } else if (u < (unit | extra)) { 1352 de = dev; 1353 continue; 1354 } else if (u > (unit | extra)) { 1355 dl = dev; 1356 break; 1357 } 1358 } 1359 if (unit == -1) 1360 unit = low & CLONE_UNITMASK; 1361 make_dev_args_init(&args); 1362 args.mda_unit = unit | extra; 1363 args.mda_devsw = csw; 1364 dev = newdev(&args, ndev); 1365 if (dev->si_flags & SI_CLONELIST) { 1366 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 1367 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra); 1368 LIST_FOREACH(dev, &cd->head, si_clone) { 1369 printf("\t%p %s\n", dev, dev->si_name); 1370 } 1371 panic("foo"); 1372 } 1373 KASSERT(!(dev->si_flags & SI_CLONELIST), 1374 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 1375 if (dl != NULL) 1376 LIST_INSERT_BEFORE(dl, dev, si_clone); 1377 else if (de != NULL) 1378 LIST_INSERT_AFTER(de, dev, si_clone); 1379 else 1380 LIST_INSERT_HEAD(&cd->head, dev, si_clone); 1381 dev->si_flags |= SI_CLONELIST; 1382 *up = unit; 1383 dev_unlock_and_free(); 1384 return (1); 1385} 1386 1387/* 1388 * Kill everything still on the list. The driver should already have 1389 * disposed of any softc hung of the struct cdev *'s at this time. 1390 */ 1391void 1392clone_cleanup(struct clonedevs **cdp) 1393{ 1394 struct cdev *dev; 1395 struct cdev_priv *cp; 1396 struct clonedevs *cd; 1397 1398 cd = *cdp; 1399 if (cd == NULL) 1400 return; 1401 dev_lock(); 1402 while (!LIST_EMPTY(&cd->head)) { 1403 dev = LIST_FIRST(&cd->head); 1404 LIST_REMOVE(dev, si_clone); 1405 KASSERT(dev->si_flags & SI_CLONELIST, 1406 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1407 dev->si_flags &= ~SI_CLONELIST; 1408 cp = cdev2priv(dev); 1409 if (!(cp->cdp_flags & CDP_SCHED_DTR)) { 1410 cp->cdp_flags |= CDP_SCHED_DTR; 1411 KASSERT(dev->si_flags & SI_NAMED, 1412 ("Driver has goofed in cloning underways udev %jx unit %x", 1413 (uintmax_t)dev2udev(dev), dev2unit(dev))); 1414 destroy_devl(dev); 1415 } 1416 } 1417 dev_unlock_and_free(); 1418 free(cd, M_DEVBUF); 1419 *cdp = NULL; 1420} 1421 1422static TAILQ_HEAD(, cdev_priv) dev_ddtr = 1423 TAILQ_HEAD_INITIALIZER(dev_ddtr); 1424static TAILQ_HEAD(, cdev_priv) dev_ddtr_giant = 1425 TAILQ_HEAD_INITIALIZER(dev_ddtr_giant); 1426static struct task dev_dtr_task = TASK_INITIALIZER(0, destroy_dev_tq, &dev_ddtr); 1427static struct task dev_dtr_task_giant = TASK_INITIALIZER(0, destroy_dev_tq_giant, 1428 &dev_ddtr_giant); 1429 1430static void 1431destroy_dev_tq(void *ctx, int pending) 1432{ 1433 TAILQ_HEAD(, cdev_priv) *ddtr = ctx; 1434 struct cdev_priv *cp; 1435 struct cdev *dev; 1436 void (*cb)(void *); 1437 void *cb_arg; 1438 1439 dev_lock(); 1440 while (!TAILQ_EMPTY(ddtr)) { 1441 cp = TAILQ_FIRST(ddtr); 1442 dev = &cp->cdp_c; 1443 KASSERT(cp->cdp_flags & CDP_SCHED_DTR, 1444 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp)); 1445 TAILQ_REMOVE(ddtr, cp, cdp_dtr_list); 1446 cb = cp->cdp_dtr_cb; 1447 cb_arg = cp->cdp_dtr_cb_arg; 1448 destroy_devl(dev); 1449 dev_unlock_and_free(); 1450 dev_rel(dev); 1451 if (cb != NULL) 1452 cb(cb_arg); 1453 dev_lock(); 1454 } 1455 dev_unlock(); 1456} 1457 1458static void 1459destroy_dev_tq_giant(void *ctx, int pending) 1460{ 1461 mtx_lock(&Giant); 1462 destroy_dev_tq(ctx, pending); 1463 mtx_unlock(&Giant); 1464} 1465 1466/* 1467 * devmtx shall be locked on entry. devmtx will be unlocked after 1468 * function return. 1469 */ 1470static int 1471destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg) 1472{ 1473 struct cdev_priv *cp; 1474 bool need_giant; 1475 1476 dev_lock_assert_locked(); 1477 cp = cdev2priv(dev); 1478 if (cp->cdp_flags & CDP_SCHED_DTR) { 1479 dev_unlock(); 1480 return (0); 1481 } 1482 dev_refl(dev); 1483 cp->cdp_flags |= CDP_SCHED_DTR; 1484 cp->cdp_dtr_cb = cb; 1485 cp->cdp_dtr_cb_arg = arg; 1486 need_giant = (dev->si_devsw->d_flags & D_NEEDGIANT) != 0; 1487 if (need_giant) 1488 TAILQ_INSERT_TAIL(&dev_ddtr_giant, cp, cdp_dtr_list); 1489 else 1490 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list); 1491 dev_unlock(); 1492 if (need_giant) 1493 taskqueue_enqueue(taskqueue_thread, &dev_dtr_task_giant); 1494 else 1495 taskqueue_enqueue(taskqueue_thread, &dev_dtr_task); 1496 return (1); 1497} 1498 1499int 1500destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg) 1501{ 1502 1503 dev_lock(); 1504 return (destroy_dev_sched_cbl(dev, cb, arg)); 1505} 1506 1507int 1508destroy_dev_sched(struct cdev *dev) 1509{ 1510 1511 return (destroy_dev_sched_cb(dev, NULL, NULL)); 1512} 1513 1514void 1515destroy_dev_drain(struct cdevsw *csw) 1516{ 1517 1518 dev_lock(); 1519 while (!LIST_EMPTY(&csw->d_devs)) { 1520 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10); 1521 } 1522 dev_unlock(); 1523} 1524 1525#include "opt_ddb.h" 1526#ifdef DDB 1527#include <sys/kernel.h> 1528 1529#include <ddb/ddb.h> 1530 1531DB_SHOW_COMMAND(cdev, db_show_cdev) 1532{ 1533 struct cdev_priv *cdp; 1534 struct cdev *dev; 1535 u_int flags; 1536 char buf[512]; 1537 1538 if (!have_addr) { 1539 TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { 1540 dev = &cdp->cdp_c; 1541 db_printf("%s %p\n", dev->si_name, dev); 1542 if (db_pager_quit) 1543 break; 1544 } 1545 return; 1546 } 1547 1548 dev = (struct cdev *)addr; 1549 cdp = cdev2priv(dev); 1550 db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n", 1551 dev->si_name, dev->si_refcount, dev->si_usecount, 1552 dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first); 1553 db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n", 1554 dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2); 1555 flags = dev->si_flags; 1556#define SI_FLAG(flag) do { \ 1557 if (flags & (flag)) { \ 1558 if (buf[0] != '\0') \ 1559 strlcat(buf, ", ", sizeof(buf)); \ 1560 strlcat(buf, (#flag) + 3, sizeof(buf)); \ 1561 flags &= ~(flag); \ 1562 } \ 1563} while (0) 1564 buf[0] = '\0'; 1565 SI_FLAG(SI_ETERNAL); 1566 SI_FLAG(SI_ALIAS); 1567 SI_FLAG(SI_NAMED); 1568 SI_FLAG(SI_CHILD); 1569 SI_FLAG(SI_DUMPDEV); 1570 SI_FLAG(SI_CLONELIST); 1571 db_printf("si_flags %s\n", buf); 1572 1573 flags = cdp->cdp_flags; 1574#define CDP_FLAG(flag) do { \ 1575 if (flags & (flag)) { \ 1576 if (buf[0] != '\0') \ 1577 strlcat(buf, ", ", sizeof(buf)); \ 1578 strlcat(buf, (#flag) + 4, sizeof(buf)); \ 1579 flags &= ~(flag); \ 1580 } \ 1581} while (0) 1582 buf[0] = '\0'; 1583 CDP_FLAG(CDP_ACTIVE); 1584 CDP_FLAG(CDP_SCHED_DTR); 1585 db_printf("cdp_flags %s\n", buf); 1586} 1587#endif 1588