Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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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("$FreeBSD$"); 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 (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 } 177 178 struct cdevsw * 179 dev_refthread(struct cdev *dev, int *ref) 180 { 181 struct cdevsw *csw; 182 struct cdev_priv *cdp; 183 184 mtx_assert(&devmtx, MA_NOTOWNED); 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 *ref = 1; 200 return (csw); 201 } 202 203 struct cdevsw * 204 devvn_refthread(struct vnode *vp, struct cdev **devp, int *ref) 205 { 206 struct cdevsw *csw; 207 struct cdev_priv *cdp; 208 struct cdev *dev; 209 210 mtx_assert(&devmtx, MA_NOTOWNED); 211 if ((vp->v_vflag & VV_ETERNALDEV) != 0) { 212 dev = vp->v_rdev; 213 if (dev == NULL) 214 return (NULL); 215 KASSERT((dev->si_flags & SI_ETERNAL) != 0, 216 ("Not eternal cdev")); 217 *ref = 0; 218 csw = dev->si_devsw; 219 KASSERT(csw != NULL, ("Eternal cdev is destroyed")); 220 *devp = dev; 221 return (csw); 222 } 223 224 csw = NULL; 225 VI_LOCK(vp); 226 dev = vp->v_rdev; 227 if (dev == NULL) { 228 VI_UNLOCK(vp); 229 return (NULL); 230 } 231 cdp = cdev2priv(dev); 232 mtx_lock(&cdp->cdp_threadlock); 233 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) { 234 csw = dev->si_devsw; 235 if (csw != NULL) 236 atomic_add_long(&dev->si_threadcount, 1); 237 } 238 mtx_unlock(&cdp->cdp_threadlock); 239 VI_UNLOCK(vp); 240 if (csw != NULL) { 241 *devp = dev; 242 *ref = 1; 243 } 244 return (csw); 245 } 246 247 void 248 dev_relthread(struct cdev *dev, int ref) 249 { 250 251 mtx_assert(&devmtx, MA_NOTOWNED); 252 if (!ref) 253 return; 254 KASSERT(dev->si_threadcount > 0, 255 ("%s threadcount is wrong", dev->si_name)); 256 atomic_subtract_rel_long(&dev->si_threadcount, 1); 257 } 258 259 int 260 nullop(void) 261 { 262 263 return (0); 264 } 265 266 int 267 eopnotsupp(void) 268 { 269 270 return (EOPNOTSUPP); 271 } 272 273 static int 274 enxio(void) 275 { 276 return (ENXIO); 277 } 278 279 static int 280 enodev(void) 281 { 282 return (ENODEV); 283 } 284 285 /* Define a dead_cdevsw for use when devices leave unexpectedly. */ 286 287 #define dead_open (d_open_t *)enxio 288 #define dead_close (d_close_t *)enxio 289 #define dead_read (d_read_t *)enxio 290 #define dead_write (d_write_t *)enxio 291 #define dead_ioctl (d_ioctl_t *)enxio 292 #define dead_poll (d_poll_t *)enodev 293 #define dead_mmap (d_mmap_t *)enodev 294 295 static void 296 dead_strategy(struct bio *bp) 297 { 298 299 biofinish(bp, NULL, ENXIO); 300 } 301 302 #define dead_dump (dumper_t *)enxio 303 #define dead_kqfilter (d_kqfilter_t *)enxio 304 #define dead_mmap_single (d_mmap_single_t *)enodev 305 306 static 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_dump = dead_dump, 318 .d_kqfilter = dead_kqfilter, 319 .d_mmap_single = dead_mmap_single 320 }; 321 322 /* Default methods if driver does not specify method */ 323 324 #define null_open (d_open_t *)nullop 325 #define null_close (d_close_t *)nullop 326 #define no_read (d_read_t *)enodev 327 #define no_write (d_write_t *)enodev 328 #define no_ioctl (d_ioctl_t *)enodev 329 #define no_mmap (d_mmap_t *)enodev 330 #define no_kqfilter (d_kqfilter_t *)enodev 331 #define no_mmap_single (d_mmap_single_t *)enodev 332 333 static void 334 no_strategy(struct bio *bp) 335 { 336 337 biofinish(bp, NULL, ENODEV); 338 } 339 340 static int 341 no_poll(struct cdev *dev __unused, int events, struct thread *td __unused) 342 { 343 344 return (poll_no_poll(events)); 345 } 346 347 #define no_dump (dumper_t *)enodev 348 349 static int 350 giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 351 { 352 struct cdevsw *dsw; 353 int ref, retval; 354 355 dsw = dev_refthread(dev, &ref); 356 if (dsw == NULL) 357 return (ENXIO); 358 mtx_lock(&Giant); 359 retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td); 360 mtx_unlock(&Giant); 361 dev_relthread(dev, ref); 362 return (retval); 363 } 364 365 static int 366 giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp) 367 { 368 struct cdevsw *dsw; 369 int ref, retval; 370 371 dsw = dev_refthread(dev, &ref); 372 if (dsw == NULL) 373 return (ENXIO); 374 mtx_lock(&Giant); 375 retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp); 376 mtx_unlock(&Giant); 377 dev_relthread(dev, ref); 378 return (retval); 379 } 380 381 static int 382 giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 383 { 384 struct cdevsw *dsw; 385 int ref, retval; 386 387 dsw = dev_refthread(dev, &ref); 388 if (dsw == NULL) 389 return (ENXIO); 390 mtx_lock(&Giant); 391 retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td); 392 mtx_unlock(&Giant); 393 dev_relthread(dev, ref); 394 return (retval); 395 } 396 397 static void 398 giant_strategy(struct bio *bp) 399 { 400 struct cdevsw *dsw; 401 struct cdev *dev; 402 int ref; 403 404 dev = bp->bio_dev; 405 dsw = dev_refthread(dev, &ref); 406 if (dsw == NULL) { 407 biofinish(bp, NULL, ENXIO); 408 return; 409 } 410 mtx_lock(&Giant); 411 dsw->d_gianttrick->d_strategy(bp); 412 mtx_unlock(&Giant); 413 dev_relthread(dev, ref); 414 } 415 416 static int 417 giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 418 { 419 struct cdevsw *dsw; 420 int ref, retval; 421 422 dsw = dev_refthread(dev, &ref); 423 if (dsw == NULL) 424 return (ENXIO); 425 mtx_lock(&Giant); 426 retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td); 427 mtx_unlock(&Giant); 428 dev_relthread(dev, ref); 429 return (retval); 430 } 431 432 static int 433 giant_read(struct cdev *dev, struct uio *uio, int ioflag) 434 { 435 struct cdevsw *dsw; 436 int ref, retval; 437 438 dsw = dev_refthread(dev, &ref); 439 if (dsw == NULL) 440 return (ENXIO); 441 mtx_lock(&Giant); 442 retval = dsw->d_gianttrick->d_read(dev, uio, ioflag); 443 mtx_unlock(&Giant); 444 dev_relthread(dev, ref); 445 return (retval); 446 } 447 448 static int 449 giant_write(struct cdev *dev, struct uio *uio, int ioflag) 450 { 451 struct cdevsw *dsw; 452 int ref, retval; 453 454 dsw = dev_refthread(dev, &ref); 455 if (dsw == NULL) 456 return (ENXIO); 457 mtx_lock(&Giant); 458 retval = dsw->d_gianttrick->d_write(dev, uio, ioflag); 459 mtx_unlock(&Giant); 460 dev_relthread(dev, ref); 461 return (retval); 462 } 463 464 static int 465 giant_poll(struct cdev *dev, int events, struct thread *td) 466 { 467 struct cdevsw *dsw; 468 int ref, retval; 469 470 dsw = dev_refthread(dev, &ref); 471 if (dsw == NULL) 472 return (ENXIO); 473 mtx_lock(&Giant); 474 retval = dsw->d_gianttrick->d_poll(dev, events, td); 475 mtx_unlock(&Giant); 476 dev_relthread(dev, ref); 477 return (retval); 478 } 479 480 static int 481 giant_kqfilter(struct cdev *dev, struct knote *kn) 482 { 483 struct cdevsw *dsw; 484 int ref, retval; 485 486 dsw = dev_refthread(dev, &ref); 487 if (dsw == NULL) 488 return (ENXIO); 489 mtx_lock(&Giant); 490 retval = dsw->d_gianttrick->d_kqfilter(dev, kn); 491 mtx_unlock(&Giant); 492 dev_relthread(dev, ref); 493 return (retval); 494 } 495 496 static int 497 giant_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot, 498 vm_memattr_t *memattr) 499 { 500 struct cdevsw *dsw; 501 int ref, retval; 502 503 dsw = dev_refthread(dev, &ref); 504 if (dsw == NULL) 505 return (ENXIO); 506 mtx_lock(&Giant); 507 retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot, 508 memattr); 509 mtx_unlock(&Giant); 510 dev_relthread(dev, ref); 511 return (retval); 512 } 513 514 static int 515 giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size, 516 vm_object_t *object, int nprot) 517 { 518 struct cdevsw *dsw; 519 int ref, retval; 520 521 dsw = dev_refthread(dev, &ref); 522 if (dsw == NULL) 523 return (ENXIO); 524 mtx_lock(&Giant); 525 retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object, 526 nprot); 527 mtx_unlock(&Giant); 528 dev_relthread(dev, ref); 529 return (retval); 530 } 531 532 static void 533 notify(struct cdev *dev, const char *ev, int flags) 534 { 535 static const char prefix[] = "cdev="; 536 char *data; 537 int namelen, mflags; 538 539 if (cold) 540 return; 541 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; 542 namelen = strlen(dev->si_name); 543 data = malloc(namelen + sizeof(prefix), M_TEMP, mflags); 544 if (data == NULL) 545 return; 546 memcpy(data, prefix, sizeof(prefix) - 1); 547 memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1); 548 devctl_notify_f("DEVFS", "CDEV", ev, data, mflags); 549 free(data, M_TEMP); 550 } 551 552 static void 553 notify_create(struct cdev *dev, int flags) 554 { 555 556 notify(dev, "CREATE", flags); 557 } 558 559 static void 560 notify_destroy(struct cdev *dev) 561 { 562 563 notify(dev, "DESTROY", MAKEDEV_WAITOK); 564 } 565 566 static struct cdev * 567 newdev(struct make_dev_args *args, struct cdev *si) 568 { 569 struct cdev *si2; 570 struct cdevsw *csw; 571 572 mtx_assert(&devmtx, MA_OWNED); 573 csw = args->mda_devsw; 574 si2 = NULL; 575 if (csw->d_flags & D_NEEDMINOR) { 576 /* We may want to return an existing device */ 577 LIST_FOREACH(si2, &csw->d_devs, si_list) { 578 if (dev2unit(si2) == args->mda_unit) { 579 dev_free_devlocked(si); 580 si = si2; 581 break; 582 } 583 } 584 585 /* 586 * If we're returning an existing device, we should make sure 587 * it isn't already initialized. This would have been caught 588 * in consumers anyways, but it's good to catch such a case 589 * early. We still need to complete initialization of the 590 * device, and we'll use whatever make_dev_args were passed in 591 * to do so. 592 */ 593 KASSERT(si2 == NULL || (si2->si_flags & SI_NAMED) == 0, 594 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", 595 args->mda_devsw->d_name, dev2unit(si2), devtoname(si2))); 596 } 597 si->si_drv0 = args->mda_unit; 598 si->si_drv1 = args->mda_si_drv1; 599 si->si_drv2 = args->mda_si_drv2; 600 /* Only push to csw->d_devs if it's not a cloned device. */ 601 if (si2 == NULL) { 602 si->si_devsw = csw; 603 LIST_INSERT_HEAD(&csw->d_devs, si, si_list); 604 } else { 605 KASSERT(si->si_devsw == csw, 606 ("%s: inconsistent devsw between clone_create() and make_dev()", 607 __func__)); 608 } 609 return (si); 610 } 611 612 static void 613 fini_cdevsw(struct cdevsw *devsw) 614 { 615 struct cdevsw *gt; 616 617 if (devsw->d_gianttrick != NULL) { 618 gt = devsw->d_gianttrick; 619 memcpy(devsw, gt, sizeof *devsw); 620 cdevsw_free_devlocked(gt); 621 devsw->d_gianttrick = NULL; 622 } 623 devsw->d_flags &= ~D_INIT; 624 } 625 626 static int 627 prep_cdevsw(struct cdevsw *devsw, int flags) 628 { 629 struct cdevsw *dsw2; 630 631 mtx_assert(&devmtx, MA_OWNED); 632 if (devsw->d_flags & D_INIT) 633 return (0); 634 if (devsw->d_flags & D_NEEDGIANT) { 635 dev_unlock(); 636 dsw2 = malloc(sizeof *dsw2, M_DEVT, 637 (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK); 638 dev_lock(); 639 if (dsw2 == NULL && !(devsw->d_flags & D_INIT)) 640 return (ENOMEM); 641 } else 642 dsw2 = NULL; 643 if (devsw->d_flags & D_INIT) { 644 if (dsw2 != NULL) 645 cdevsw_free_devlocked(dsw2); 646 return (0); 647 } 648 649 if (devsw->d_version != D_VERSION_03) { 650 printf( 651 "WARNING: Device driver \"%s\" has wrong version %s\n", 652 devsw->d_name == NULL ? "???" : devsw->d_name, 653 "and is disabled. Recompile KLD module."); 654 devsw->d_open = dead_open; 655 devsw->d_close = dead_close; 656 devsw->d_read = dead_read; 657 devsw->d_write = dead_write; 658 devsw->d_ioctl = dead_ioctl; 659 devsw->d_poll = dead_poll; 660 devsw->d_mmap = dead_mmap; 661 devsw->d_mmap_single = dead_mmap_single; 662 devsw->d_strategy = dead_strategy; 663 devsw->d_dump = dead_dump; 664 devsw->d_kqfilter = dead_kqfilter; 665 } 666 667 if (devsw->d_flags & D_NEEDGIANT) { 668 printf("WARNING: Device \"%s\" is Giant locked and may be " 669 "deleted before FreeBSD 14.0.\n", 670 devsw->d_name == NULL ? "???" : devsw->d_name); 671 if (devsw->d_gianttrick == NULL) { 672 memcpy(dsw2, devsw, sizeof *dsw2); 673 devsw->d_gianttrick = dsw2; 674 dsw2 = NULL; 675 } 676 } 677 678 #define FIXUP(member, noop, giant) \ 679 do { \ 680 if (devsw->member == NULL) { \ 681 devsw->member = noop; \ 682 } else if (devsw->d_flags & D_NEEDGIANT) \ 683 devsw->member = giant; \ 684 } \ 685 while (0) 686 687 FIXUP(d_open, null_open, giant_open); 688 FIXUP(d_fdopen, NULL, giant_fdopen); 689 FIXUP(d_close, null_close, giant_close); 690 FIXUP(d_read, no_read, giant_read); 691 FIXUP(d_write, no_write, giant_write); 692 FIXUP(d_ioctl, no_ioctl, giant_ioctl); 693 FIXUP(d_poll, no_poll, giant_poll); 694 FIXUP(d_mmap, no_mmap, giant_mmap); 695 FIXUP(d_strategy, no_strategy, giant_strategy); 696 FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter); 697 FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single); 698 699 if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 700 701 LIST_INIT(&devsw->d_devs); 702 703 devsw->d_flags |= D_INIT; 704 705 if (dsw2 != NULL) 706 cdevsw_free_devlocked(dsw2); 707 return (0); 708 } 709 710 static int 711 prep_devname(struct cdev *dev, const char *fmt, va_list ap) 712 { 713 int len; 714 char *from, *q, *s, *to; 715 716 mtx_assert(&devmtx, MA_OWNED); 717 718 len = vsnrprintf(dev->si_name, sizeof(dev->si_name), 32, fmt, ap); 719 if (len > sizeof(dev->si_name) - 1) 720 return (ENAMETOOLONG); 721 722 /* Strip leading slashes. */ 723 for (from = dev->si_name; *from == '/'; from++) 724 ; 725 726 for (to = dev->si_name; *from != '\0'; from++, to++) { 727 /* 728 * Spaces and double quotation marks cause 729 * problems for the devctl(4) protocol. 730 * Reject names containing those characters. 731 */ 732 if (isspace(*from) || *from == '"') 733 return (EINVAL); 734 /* Treat multiple sequential slashes as single. */ 735 while (from[0] == '/' && from[1] == '/') 736 from++; 737 /* Trailing slash is considered invalid. */ 738 if (from[0] == '/' && from[1] == '\0') 739 return (EINVAL); 740 *to = *from; 741 } 742 *to = '\0'; 743 744 if (dev->si_name[0] == '\0') 745 return (EINVAL); 746 747 /* Disallow "." and ".." components. */ 748 for (s = dev->si_name;;) { 749 for (q = s; *q != '/' && *q != '\0'; q++) 750 ; 751 if (q - s == 1 && s[0] == '.') 752 return (EINVAL); 753 if (q - s == 2 && s[0] == '.' && s[1] == '.') 754 return (EINVAL); 755 if (*q != '/') 756 break; 757 s = q + 1; 758 } 759 760 if (devfs_dev_exists(dev->si_name) != 0) 761 return (EEXIST); 762 763 return (0); 764 } 765 766 void 767 make_dev_args_init_impl(struct make_dev_args *args, size_t sz) 768 { 769 770 bzero(args, sz); 771 args->mda_size = sz; 772 } 773 774 static int 775 make_dev_sv(struct make_dev_args *args1, struct cdev **dres, 776 const char *fmt, va_list ap) 777 { 778 struct cdev *dev, *dev_new; 779 struct make_dev_args args; 780 int res; 781 782 bzero(&args, sizeof(args)); 783 if (sizeof(args) < args1->mda_size) 784 return (EINVAL); 785 bcopy(args1, &args, args1->mda_size); 786 KASSERT((args.mda_flags & MAKEDEV_WAITOK) == 0 || 787 (args.mda_flags & MAKEDEV_NOWAIT) == 0, 788 ("make_dev_sv: both WAITOK and NOWAIT specified")); 789 dev_new = devfs_alloc(args.mda_flags); 790 if (dev_new == NULL) 791 return (ENOMEM); 792 dev_lock(); 793 res = prep_cdevsw(args.mda_devsw, args.mda_flags); 794 if (res != 0) { 795 dev_unlock(); 796 devfs_free(dev_new); 797 return (res); 798 } 799 dev = newdev(&args, dev_new); 800 if ((dev->si_flags & SI_NAMED) == 0) { 801 res = prep_devname(dev, fmt, ap); 802 if (res != 0) { 803 if ((args.mda_flags & MAKEDEV_CHECKNAME) == 0) { 804 panic( 805 "make_dev_sv: bad si_name (error=%d, si_name=%s)", 806 res, dev->si_name); 807 } 808 if (dev == dev_new) { 809 LIST_REMOVE(dev, si_list); 810 dev_unlock(); 811 devfs_free(dev); 812 } else 813 dev_unlock(); 814 return (res); 815 } 816 } 817 if ((args.mda_flags & MAKEDEV_REF) != 0) 818 dev_refl(dev); 819 if ((args.mda_flags & MAKEDEV_ETERNAL) != 0) 820 dev->si_flags |= SI_ETERNAL; 821 KASSERT(!(dev->si_flags & SI_NAMED), 822 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", 823 args.mda_devsw->d_name, dev2unit(dev), devtoname(dev))); 824 dev->si_flags |= SI_NAMED; 825 if (args.mda_cr != NULL) 826 dev->si_cred = crhold(args.mda_cr); 827 dev->si_uid = args.mda_uid; 828 dev->si_gid = args.mda_gid; 829 dev->si_mode = args.mda_mode; 830 831 devfs_create(dev); 832 clean_unrhdrl(devfs_inos); 833 dev_unlock_and_free(); 834 835 notify_create(dev, args.mda_flags); 836 837 *dres = dev; 838 return (0); 839 } 840 841 int 842 make_dev_s(struct make_dev_args *args, struct cdev **dres, 843 const char *fmt, ...) 844 { 845 va_list ap; 846 int res; 847 848 va_start(ap, fmt); 849 res = make_dev_sv(args, dres, fmt, ap); 850 va_end(ap); 851 return (res); 852 } 853 854 static int 855 make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit, 856 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 857 va_list ap) 858 { 859 struct make_dev_args args; 860 861 make_dev_args_init(&args); 862 args.mda_flags = flags; 863 args.mda_devsw = devsw; 864 args.mda_cr = cr; 865 args.mda_uid = uid; 866 args.mda_gid = gid; 867 args.mda_mode = mode; 868 args.mda_unit = unit; 869 return (make_dev_sv(&args, dres, fmt, ap)); 870 } 871 872 struct cdev * 873 make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode, 874 const char *fmt, ...) 875 { 876 struct cdev *dev; 877 va_list ap; 878 int res __unused; 879 880 va_start(ap, fmt); 881 res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt, 882 ap); 883 va_end(ap); 884 KASSERT(res == 0 && dev != NULL, 885 ("make_dev: failed make_dev_credv (error=%d)", res)); 886 return (dev); 887 } 888 889 struct cdev * 890 make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid, 891 gid_t gid, int mode, const char *fmt, ...) 892 { 893 struct cdev *dev; 894 va_list ap; 895 int res __unused; 896 897 va_start(ap, fmt); 898 res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap); 899 va_end(ap); 900 901 KASSERT(res == 0 && dev != NULL, 902 ("make_dev_cred: failed make_dev_credv (error=%d)", res)); 903 return (dev); 904 } 905 906 struct cdev * 907 make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr, 908 uid_t uid, gid_t gid, int mode, const char *fmt, ...) 909 { 910 struct cdev *dev; 911 va_list ap; 912 int res; 913 914 va_start(ap, fmt); 915 res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode, 916 fmt, ap); 917 va_end(ap); 918 919 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 920 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 921 ("make_dev_credf: failed make_dev_credv (error=%d)", res)); 922 return (res == 0 ? dev : NULL); 923 } 924 925 int 926 make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw, 927 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...) 928 { 929 va_list ap; 930 int res; 931 932 va_start(ap, fmt); 933 res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode, 934 fmt, ap); 935 va_end(ap); 936 937 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 938 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 939 ("make_dev_p: failed make_dev_credv (error=%d)", res)); 940 return (res); 941 } 942 943 static void 944 dev_dependsl(struct cdev *pdev, struct cdev *cdev) 945 { 946 947 cdev->si_parent = pdev; 948 cdev->si_flags |= SI_CHILD; 949 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 950 } 951 952 953 void 954 dev_depends(struct cdev *pdev, struct cdev *cdev) 955 { 956 957 dev_lock(); 958 dev_dependsl(pdev, cdev); 959 dev_unlock(); 960 } 961 962 static int 963 make_dev_alias_v(int flags, struct cdev **cdev, struct cdev *pdev, 964 const char *fmt, va_list ap) 965 { 966 struct cdev *dev; 967 int error; 968 969 KASSERT(pdev != NULL, ("make_dev_alias_v: pdev is NULL")); 970 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, 971 ("make_dev_alias_v: both WAITOK and NOWAIT specified")); 972 KASSERT((flags & ~(MAKEDEV_WAITOK | MAKEDEV_NOWAIT | 973 MAKEDEV_CHECKNAME)) == 0, 974 ("make_dev_alias_v: invalid flags specified (flags=%02x)", flags)); 975 976 dev = devfs_alloc(flags); 977 if (dev == NULL) 978 return (ENOMEM); 979 dev_lock(); 980 dev->si_flags |= SI_ALIAS; 981 error = prep_devname(dev, fmt, ap); 982 if (error != 0) { 983 if ((flags & MAKEDEV_CHECKNAME) == 0) { 984 panic("make_dev_alias_v: bad si_name " 985 "(error=%d, si_name=%s)", error, dev->si_name); 986 } 987 dev_unlock(); 988 devfs_free(dev); 989 return (error); 990 } 991 dev->si_flags |= SI_NAMED; 992 devfs_create(dev); 993 dev_dependsl(pdev, dev); 994 clean_unrhdrl(devfs_inos); 995 dev_unlock(); 996 997 notify_create(dev, flags); 998 *cdev = dev; 999 1000 return (0); 1001 } 1002 1003 struct cdev * 1004 make_dev_alias(struct cdev *pdev, const char *fmt, ...) 1005 { 1006 struct cdev *dev; 1007 va_list ap; 1008 int res __unused; 1009 1010 va_start(ap, fmt); 1011 res = make_dev_alias_v(MAKEDEV_WAITOK, &dev, pdev, fmt, ap); 1012 va_end(ap); 1013 1014 KASSERT(res == 0 && dev != NULL, 1015 ("make_dev_alias: failed make_dev_alias_v (error=%d)", res)); 1016 return (dev); 1017 } 1018 1019 int 1020 make_dev_alias_p(int flags, struct cdev **cdev, struct cdev *pdev, 1021 const char *fmt, ...) 1022 { 1023 va_list ap; 1024 int res; 1025 1026 va_start(ap, fmt); 1027 res = make_dev_alias_v(flags, cdev, pdev, fmt, ap); 1028 va_end(ap); 1029 return (res); 1030 } 1031 1032 int 1033 make_dev_physpath_alias(int flags, struct cdev **cdev, struct cdev *pdev, 1034 struct cdev *old_alias, const char *physpath) 1035 { 1036 char *devfspath; 1037 int physpath_len; 1038 int max_parentpath_len; 1039 int parentpath_len; 1040 int devfspathbuf_len; 1041 int mflags; 1042 int ret; 1043 1044 *cdev = NULL; 1045 devfspath = NULL; 1046 physpath_len = strlen(physpath); 1047 ret = EINVAL; 1048 if (physpath_len == 0) 1049 goto out; 1050 1051 if (strncmp("id1,", physpath, 4) == 0) { 1052 physpath += 4; 1053 physpath_len -= 4; 1054 if (physpath_len == 0) 1055 goto out; 1056 } 1057 1058 max_parentpath_len = SPECNAMELEN - physpath_len - /*/*/1; 1059 parentpath_len = strlen(pdev->si_name); 1060 if (max_parentpath_len < parentpath_len) { 1061 if (bootverbose) 1062 printf("WARNING: Unable to alias %s " 1063 "to %s/%s - path too long\n", 1064 pdev->si_name, physpath, pdev->si_name); 1065 ret = ENAMETOOLONG; 1066 goto out; 1067 } 1068 1069 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; 1070 devfspathbuf_len = physpath_len + /*/*/1 + parentpath_len + /*NUL*/1; 1071 devfspath = malloc(devfspathbuf_len, M_DEVBUF, mflags); 1072 if (devfspath == NULL) { 1073 ret = ENOMEM; 1074 goto out; 1075 } 1076 1077 sprintf(devfspath, "%s/%s", physpath, pdev->si_name); 1078 if (old_alias != NULL && strcmp(old_alias->si_name, devfspath) == 0) { 1079 /* Retain the existing alias. */ 1080 *cdev = old_alias; 1081 old_alias = NULL; 1082 ret = 0; 1083 } else { 1084 ret = make_dev_alias_p(flags, cdev, pdev, "%s", devfspath); 1085 } 1086 out: 1087 if (old_alias != NULL) 1088 destroy_dev(old_alias); 1089 if (devfspath != NULL) 1090 free(devfspath, M_DEVBUF); 1091 return (ret); 1092 } 1093 1094 static void 1095 destroy_devl(struct cdev *dev) 1096 { 1097 struct cdevsw *csw; 1098 struct cdev_privdata *p; 1099 struct cdev_priv *cdp; 1100 1101 mtx_assert(&devmtx, MA_OWNED); 1102 KASSERT(dev->si_flags & SI_NAMED, 1103 ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev))); 1104 KASSERT((dev->si_flags & SI_ETERNAL) == 0, 1105 ("WARNING: Driver mistake: destroy_dev on eternal %d\n", 1106 dev2unit(dev))); 1107 1108 cdp = cdev2priv(dev); 1109 if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) { 1110 /* 1111 * Avoid race with dev_rel(), e.g. from the populate 1112 * loop. If CDP_UNREF_DTR flag is set, the reference 1113 * to be dropped at the end of destroy_devl() was 1114 * already taken by delist_dev_locked(). 1115 */ 1116 dev_refl(dev); 1117 1118 devfs_destroy(dev); 1119 } 1120 1121 /* Remove name marking */ 1122 dev->si_flags &= ~SI_NAMED; 1123 1124 /* If we are a child, remove us from the parents list */ 1125 if (dev->si_flags & SI_CHILD) { 1126 LIST_REMOVE(dev, si_siblings); 1127 dev->si_flags &= ~SI_CHILD; 1128 } 1129 1130 /* Kill our children */ 1131 while (!LIST_EMPTY(&dev->si_children)) 1132 destroy_devl(LIST_FIRST(&dev->si_children)); 1133 1134 /* Remove from clone list */ 1135 if (dev->si_flags & SI_CLONELIST) { 1136 LIST_REMOVE(dev, si_clone); 1137 dev->si_flags &= ~SI_CLONELIST; 1138 } 1139 1140 mtx_lock(&cdp->cdp_threadlock); 1141 csw = dev->si_devsw; 1142 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 1143 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 1144 csw->d_purge(dev); 1145 mtx_unlock(&cdp->cdp_threadlock); 1146 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 1147 mtx_lock(&cdp->cdp_threadlock); 1148 if (dev->si_threadcount) 1149 printf("Still %lu threads in %s\n", 1150 dev->si_threadcount, devtoname(dev)); 1151 } 1152 while (dev->si_threadcount != 0) { 1153 /* Use unique dummy wait ident */ 1154 mtx_unlock(&cdp->cdp_threadlock); 1155 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10); 1156 mtx_lock(&cdp->cdp_threadlock); 1157 } 1158 1159 mtx_unlock(&cdp->cdp_threadlock); 1160 dev_unlock(); 1161 if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) { 1162 /* avoid out of order notify events */ 1163 notify_destroy(dev); 1164 } 1165 mtx_lock(&cdevpriv_mtx); 1166 while ((p = LIST_FIRST(&cdp->cdp_fdpriv)) != NULL) { 1167 devfs_destroy_cdevpriv(p); 1168 mtx_lock(&cdevpriv_mtx); 1169 } 1170 mtx_unlock(&cdevpriv_mtx); 1171 dev_lock(); 1172 1173 dev->si_drv1 = 0; 1174 dev->si_drv2 = 0; 1175 bzero(&dev->__si_u, sizeof(dev->__si_u)); 1176 1177 if (!(dev->si_flags & SI_ALIAS)) { 1178 /* Remove from cdevsw list */ 1179 LIST_REMOVE(dev, si_list); 1180 1181 /* If cdevsw has no more struct cdev *'s, clean it */ 1182 if (LIST_EMPTY(&csw->d_devs)) { 1183 fini_cdevsw(csw); 1184 wakeup(&csw->d_devs); 1185 } 1186 } 1187 dev->si_flags &= ~SI_ALIAS; 1188 cdp->cdp_flags &= ~CDP_UNREF_DTR; 1189 dev->si_refcount--; 1190 1191 if (dev->si_refcount > 0) 1192 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 1193 else 1194 dev_free_devlocked(dev); 1195 } 1196 1197 static void 1198 delist_dev_locked(struct cdev *dev) 1199 { 1200 struct cdev_priv *cdp; 1201 struct cdev *child; 1202 1203 mtx_assert(&devmtx, MA_OWNED); 1204 cdp = cdev2priv(dev); 1205 if ((cdp->cdp_flags & CDP_UNREF_DTR) != 0) 1206 return; 1207 cdp->cdp_flags |= CDP_UNREF_DTR; 1208 dev_refl(dev); 1209 devfs_destroy(dev); 1210 LIST_FOREACH(child, &dev->si_children, si_siblings) 1211 delist_dev_locked(child); 1212 dev_unlock(); 1213 /* ensure the destroy event is queued in order */ 1214 notify_destroy(dev); 1215 dev_lock(); 1216 } 1217 1218 /* 1219 * This function will delist a character device and its children from 1220 * the directory listing and create a destroy event without waiting 1221 * for all character device references to go away. At some later point 1222 * destroy_dev() must be called to complete the character device 1223 * destruction. After calling this function the character device name 1224 * can instantly be re-used. 1225 */ 1226 void 1227 delist_dev(struct cdev *dev) 1228 { 1229 1230 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "delist_dev"); 1231 dev_lock(); 1232 delist_dev_locked(dev); 1233 dev_unlock(); 1234 } 1235 1236 void 1237 destroy_dev(struct cdev *dev) 1238 { 1239 1240 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev"); 1241 dev_lock(); 1242 destroy_devl(dev); 1243 dev_unlock_and_free(); 1244 } 1245 1246 const char * 1247 devtoname(struct cdev *dev) 1248 { 1249 1250 return (dev->si_name); 1251 } 1252 1253 int 1254 dev_stdclone(char *name, char **namep, const char *stem, int *unit) 1255 { 1256 int u, i; 1257 1258 i = strlen(stem); 1259 if (strncmp(stem, name, i) != 0) 1260 return (0); 1261 if (!isdigit(name[i])) 1262 return (0); 1263 u = 0; 1264 if (name[i] == '' && isdigit(name[i+1])) 1265 return (0); 1266 while (isdigit(name[i])) { 1267 u *= 10; 1268 u += name[i++] - ''; 1269 } 1270 if (u > 0xffffff) 1271 return (0); 1272 *unit = u; 1273 if (namep) 1274 *namep = &name[i]; 1275 if (name[i]) 1276 return (2); 1277 return (1); 1278 } 1279 1280 /* 1281 * Helper functions for cloning device drivers. 1282 * 1283 * The objective here is to make it unnecessary for the device drivers to 1284 * use rman or similar to manage their unit number space. Due to the way 1285 * we do "on-demand" devices, using rman or other "private" methods 1286 * will be very tricky to lock down properly once we lock down this file. 1287 * 1288 * Instead we give the drivers these routines which puts the struct cdev *'s 1289 * that are to be managed on their own list, and gives the driver the ability 1290 * to ask for the first free unit number or a given specified unit number. 1291 * 1292 * In addition these routines support paired devices (pty, nmdm and similar) 1293 * by respecting a number of "flag" bits in the minor number. 1294 * 1295 */ 1296 1297 struct clonedevs { 1298 LIST_HEAD(,cdev) head; 1299 }; 1300 1301 void 1302 clone_setup(struct clonedevs **cdp) 1303 { 1304 1305 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 1306 LIST_INIT(&(*cdp)->head); 1307 } 1308 1309 int 1310 clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, 1311 struct cdev **dp, int extra) 1312 { 1313 struct clonedevs *cd; 1314 struct cdev *dev, *ndev, *dl, *de; 1315 struct make_dev_args args; 1316 int unit, low, u; 1317 1318 KASSERT(*cdp != NULL, 1319 ("clone_setup() not called in driver \"%s\"", csw->d_name)); 1320 KASSERT(!(extra & CLONE_UNITMASK), 1321 ("Illegal extra bits (0x%x) in clone_create", extra)); 1322 KASSERT(*up <= CLONE_UNITMASK, 1323 ("Too high unit (0x%x) in clone_create", *up)); 1324 KASSERT(csw->d_flags & D_NEEDMINOR, 1325 ("clone_create() on cdevsw without minor numbers")); 1326 1327 1328 /* 1329 * Search the list for a lot of things in one go: 1330 * A preexisting match is returned immediately. 1331 * The lowest free unit number if we are passed -1, and the place 1332 * in the list where we should insert that new element. 1333 * The place to insert a specified unit number, if applicable 1334 * the end of the list. 1335 */ 1336 unit = *up; 1337 ndev = devfs_alloc(MAKEDEV_WAITOK); 1338 dev_lock(); 1339 prep_cdevsw(csw, MAKEDEV_WAITOK); 1340 low = extra; 1341 de = dl = NULL; 1342 cd = *cdp; 1343 LIST_FOREACH(dev, &cd->head, si_clone) { 1344 KASSERT(dev->si_flags & SI_CLONELIST, 1345 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1346 u = dev2unit(dev); 1347 if (u == (unit | extra)) { 1348 *dp = dev; 1349 dev_unlock(); 1350 devfs_free(ndev); 1351 return (0); 1352 } 1353 if (unit == -1 && u == low) { 1354 low++; 1355 de = dev; 1356 continue; 1357 } else if (u < (unit | extra)) { 1358 de = dev; 1359 continue; 1360 } else if (u > (unit | extra)) { 1361 dl = dev; 1362 break; 1363 } 1364 } 1365 if (unit == -1) 1366 unit = low & CLONE_UNITMASK; 1367 make_dev_args_init(&args); 1368 args.mda_unit = unit | extra; 1369 args.mda_devsw = csw; 1370 dev = newdev(&args, ndev); 1371 if (dev->si_flags & SI_CLONELIST) { 1372 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 1373 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra); 1374 LIST_FOREACH(dev, &cd->head, si_clone) { 1375 printf("\t%p %s\n", dev, dev->si_name); 1376 } 1377 panic("foo"); 1378 } 1379 KASSERT(!(dev->si_flags & SI_CLONELIST), 1380 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 1381 if (dl != NULL) 1382 LIST_INSERT_BEFORE(dl, dev, si_clone); 1383 else if (de != NULL) 1384 LIST_INSERT_AFTER(de, dev, si_clone); 1385 else 1386 LIST_INSERT_HEAD(&cd->head, dev, si_clone); 1387 dev->si_flags |= SI_CLONELIST; 1388 *up = unit; 1389 dev_unlock_and_free(); 1390 return (1); 1391 } 1392 1393 /* 1394 * Kill everything still on the list. The driver should already have 1395 * disposed of any softc hung of the struct cdev *'s at this time. 1396 */ 1397 void 1398 clone_cleanup(struct clonedevs **cdp) 1399 { 1400 struct cdev *dev; 1401 struct cdev_priv *cp; 1402 struct clonedevs *cd; 1403 1404 cd = *cdp; 1405 if (cd == NULL) 1406 return; 1407 dev_lock(); 1408 while (!LIST_EMPTY(&cd->head)) { 1409 dev = LIST_FIRST(&cd->head); 1410 LIST_REMOVE(dev, si_clone); 1411 KASSERT(dev->si_flags & SI_CLONELIST, 1412 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1413 dev->si_flags &= ~SI_CLONELIST; 1414 cp = cdev2priv(dev); 1415 if (!(cp->cdp_flags & CDP_SCHED_DTR)) { 1416 cp->cdp_flags |= CDP_SCHED_DTR; 1417 KASSERT(dev->si_flags & SI_NAMED, 1418 ("Driver has goofed in cloning underways udev %jx unit %x", 1419 (uintmax_t)dev2udev(dev), dev2unit(dev))); 1420 destroy_devl(dev); 1421 } 1422 } 1423 dev_unlock_and_free(); 1424 free(cd, M_DEVBUF); 1425 *cdp = NULL; 1426 } 1427 1428 static TAILQ_HEAD(, cdev_priv) dev_ddtr = 1429 TAILQ_HEAD_INITIALIZER(dev_ddtr); 1430 static struct task dev_dtr_task = TASK_INITIALIZER(0, destroy_dev_tq, NULL); 1431 1432 static void 1433 destroy_dev_tq(void *ctx, int pending) 1434 { 1435 struct cdev_priv *cp; 1436 struct cdev *dev; 1437 void (*cb)(void *); 1438 void *cb_arg; 1439 1440 dev_lock(); 1441 while (!TAILQ_EMPTY(&dev_ddtr)) { 1442 cp = TAILQ_FIRST(&dev_ddtr); 1443 dev = &cp->cdp_c; 1444 KASSERT(cp->cdp_flags & CDP_SCHED_DTR, 1445 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp)); 1446 TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list); 1447 cb = cp->cdp_dtr_cb; 1448 cb_arg = cp->cdp_dtr_cb_arg; 1449 destroy_devl(dev); 1450 dev_unlock_and_free(); 1451 dev_rel(dev); 1452 if (cb != NULL) 1453 cb(cb_arg); 1454 dev_lock(); 1455 } 1456 dev_unlock(); 1457 } 1458 1459 /* 1460 * devmtx shall be locked on entry. devmtx will be unlocked after 1461 * function return. 1462 */ 1463 static int 1464 destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg) 1465 { 1466 struct cdev_priv *cp; 1467 1468 mtx_assert(&devmtx, MA_OWNED); 1469 cp = cdev2priv(dev); 1470 if (cp->cdp_flags & CDP_SCHED_DTR) { 1471 dev_unlock(); 1472 return (0); 1473 } 1474 dev_refl(dev); 1475 cp->cdp_flags |= CDP_SCHED_DTR; 1476 cp->cdp_dtr_cb = cb; 1477 cp->cdp_dtr_cb_arg = arg; 1478 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list); 1479 dev_unlock(); 1480 taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task); 1481 return (1); 1482 } 1483 1484 int 1485 destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg) 1486 { 1487 1488 dev_lock(); 1489 return (destroy_dev_sched_cbl(dev, cb, arg)); 1490 } 1491 1492 int 1493 destroy_dev_sched(struct cdev *dev) 1494 { 1495 1496 return (destroy_dev_sched_cb(dev, NULL, NULL)); 1497 } 1498 1499 void 1500 destroy_dev_drain(struct cdevsw *csw) 1501 { 1502 1503 dev_lock(); 1504 while (!LIST_EMPTY(&csw->d_devs)) { 1505 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10); 1506 } 1507 dev_unlock(); 1508 } 1509 1510 void 1511 drain_dev_clone_events(void) 1512 { 1513 1514 sx_xlock(&clone_drain_lock); 1515 sx_xunlock(&clone_drain_lock); 1516 } 1517 1518 #include "opt_ddb.h" 1519 #ifdef DDB 1520 #include <sys/kernel.h> 1521 1522 #include <ddb/ddb.h> 1523 1524 DB_SHOW_COMMAND(cdev, db_show_cdev) 1525 { 1526 struct cdev_priv *cdp; 1527 struct cdev *dev; 1528 u_int flags; 1529 char buf[512]; 1530 1531 if (!have_addr) { 1532 TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { 1533 dev = &cdp->cdp_c; 1534 db_printf("%s %p\n", dev->si_name, dev); 1535 if (db_pager_quit) 1536 break; 1537 } 1538 return; 1539 } 1540 1541 dev = (struct cdev *)addr; 1542 cdp = cdev2priv(dev); 1543 db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n", 1544 dev->si_name, dev->si_refcount, dev->si_usecount, 1545 dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first); 1546 db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n", 1547 dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2); 1548 flags = dev->si_flags; 1549 #define SI_FLAG(flag) do { \ 1550 if (flags & (flag)) { \ 1551 if (buf[0] != '\0') \ 1552 strlcat(buf, ", ", sizeof(buf)); \ 1553 strlcat(buf, (#flag) + 3, sizeof(buf)); \ 1554 flags &= ~(flag); \ 1555 } \ 1556 } while (0) 1557 buf[0] = '\0'; 1558 SI_FLAG(SI_ETERNAL); 1559 SI_FLAG(SI_ALIAS); 1560 SI_FLAG(SI_NAMED); 1561 SI_FLAG(SI_CHILD); 1562 SI_FLAG(SI_DUMPDEV); 1563 SI_FLAG(SI_CLONELIST); 1564 db_printf("si_flags %s\n", buf); 1565 1566 flags = cdp->cdp_flags; 1567 #define CDP_FLAG(flag) do { \ 1568 if (flags & (flag)) { \ 1569 if (buf[0] != '\0') \ 1570 strlcat(buf, ", ", sizeof(buf)); \ 1571 strlcat(buf, (#flag) + 4, sizeof(buf)); \ 1572 flags &= ~(flag); \ 1573 } \ 1574 } while (0) 1575 buf[0] = '\0'; 1576 CDP_FLAG(CDP_ACTIVE); 1577 CDP_FLAG(CDP_SCHED_DTR); 1578 db_printf("cdp_flags %s\n", buf); 1579 } 1580 #endif
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