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 * Copyright (c) 1999-2002 Poul-Henning Kamp 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/kernel.h> 32 #include <sys/systm.h> 33 #include <sys/bus.h> 34 #include <sys/bio.h> 35 #include <sys/lock.h> 36 #include <sys/mutex.h> 37 #include <sys/module.h> 38 #include <sys/malloc.h> 39 #include <sys/conf.h> 40 #include <sys/vnode.h> 41 #include <sys/queue.h> 42 #include <sys/poll.h> 43 #include <sys/sx.h> 44 #include <sys/ctype.h> 45 #include <sys/ucred.h> 46 #include <sys/taskqueue.h> 47 #include <machine/stdarg.h> 48 49 #include <fs/devfs/devfs_int.h> 50 #include <vm/vm.h> 51 52 static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage"); 53 54 struct mtx devmtx; 55 static void destroy_devl(struct cdev *dev); 56 static int destroy_dev_sched_cbl(struct cdev *dev, 57 void (*cb)(void *), void *arg); 58 static int make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, 59 int unit, struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 60 va_list ap); 61 62 static struct cdev_priv_list cdevp_free_list = 63 TAILQ_HEAD_INITIALIZER(cdevp_free_list); 64 static SLIST_HEAD(free_cdevsw, cdevsw) cdevsw_gt_post_list = 65 SLIST_HEAD_INITIALIZER(cdevsw_gt_post_list); 66 67 void 68 dev_lock(void) 69 { 70 71 mtx_lock(&devmtx); 72 } 73 74 /* 75 * Free all the memory collected while the cdev mutex was 76 * locked. Since devmtx is after the system map mutex, free() cannot 77 * be called immediately and is postponed until cdev mutex can be 78 * dropped. 79 */ 80 static void 81 dev_unlock_and_free(void) 82 { 83 struct cdev_priv_list cdp_free; 84 struct free_cdevsw csw_free; 85 struct cdev_priv *cdp; 86 struct cdevsw *csw; 87 88 mtx_assert(&devmtx, MA_OWNED); 89 90 /* 91 * Make the local copy of the list heads while the dev_mtx is 92 * held. Free it later. 93 */ 94 TAILQ_INIT(&cdp_free); 95 TAILQ_CONCAT(&cdp_free, &cdevp_free_list, cdp_list); 96 csw_free = cdevsw_gt_post_list; 97 SLIST_INIT(&cdevsw_gt_post_list); 98 99 mtx_unlock(&devmtx); 100 101 while ((cdp = TAILQ_FIRST(&cdp_free)) != NULL) { 102 TAILQ_REMOVE(&cdp_free, cdp, cdp_list); 103 devfs_free(&cdp->cdp_c); 104 } 105 while ((csw = SLIST_FIRST(&csw_free)) != NULL) { 106 SLIST_REMOVE_HEAD(&csw_free, d_postfree_list); 107 free(csw, M_DEVT); 108 } 109 } 110 111 static void 112 dev_free_devlocked(struct cdev *cdev) 113 { 114 struct cdev_priv *cdp; 115 116 mtx_assert(&devmtx, MA_OWNED); 117 cdp = cdev2priv(cdev); 118 KASSERT((cdp->cdp_flags & CDP_UNREF_DTR) == 0, 119 ("destroy_dev() was not called after delist_dev(%p)", cdev)); 120 TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list); 121 } 122 123 static void 124 cdevsw_free_devlocked(struct cdevsw *csw) 125 { 126 127 mtx_assert(&devmtx, MA_OWNED); 128 SLIST_INSERT_HEAD(&cdevsw_gt_post_list, csw, d_postfree_list); 129 } 130 131 void 132 dev_unlock(void) 133 { 134 135 mtx_unlock(&devmtx); 136 } 137 138 void 139 dev_ref(struct cdev *dev) 140 { 141 142 mtx_assert(&devmtx, MA_NOTOWNED); 143 mtx_lock(&devmtx); 144 dev->si_refcount++; 145 mtx_unlock(&devmtx); 146 } 147 148 void 149 dev_refl(struct cdev *dev) 150 { 151 152 mtx_assert(&devmtx, MA_OWNED); 153 dev->si_refcount++; 154 } 155 156 void 157 dev_rel(struct cdev *dev) 158 { 159 int flag = 0; 160 161 mtx_assert(&devmtx, MA_NOTOWNED); 162 dev_lock(); 163 dev->si_refcount--; 164 KASSERT(dev->si_refcount >= 0, 165 ("dev_rel(%s) gave negative count", devtoname(dev))); 166 #if 0 167 if (dev->si_usecount == 0 && 168 (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED)) 169 ; 170 else 171 #endif 172 if (dev->si_devsw == NULL && dev->si_refcount == 0) { 173 LIST_REMOVE(dev, si_list); 174 flag = 1; 175 } 176 dev_unlock(); 177 if (flag) 178 devfs_free(dev); 179 } 180 181 struct cdevsw * 182 dev_refthread(struct cdev *dev, int *ref) 183 { 184 struct cdevsw *csw; 185 struct cdev_priv *cdp; 186 187 mtx_assert(&devmtx, MA_NOTOWNED); 188 if ((dev->si_flags & SI_ETERNAL) != 0) { 189 *ref = 0; 190 return (dev->si_devsw); 191 } 192 dev_lock(); 193 csw = dev->si_devsw; 194 if (csw != NULL) { 195 cdp = cdev2priv(dev); 196 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) 197 dev->si_threadcount++; 198 else 199 csw = NULL; 200 } 201 dev_unlock(); 202 *ref = 1; 203 return (csw); 204 } 205 206 struct cdevsw * 207 devvn_refthread(struct vnode *vp, struct cdev **devp, int *ref) 208 { 209 struct cdevsw *csw; 210 struct cdev_priv *cdp; 211 struct cdev *dev; 212 213 mtx_assert(&devmtx, MA_NOTOWNED); 214 if ((vp->v_vflag & VV_ETERNALDEV) != 0) { 215 dev = vp->v_rdev; 216 if (dev == NULL) 217 return (NULL); 218 KASSERT((dev->si_flags & SI_ETERNAL) != 0, 219 ("Not eternal cdev")); 220 *ref = 0; 221 csw = dev->si_devsw; 222 KASSERT(csw != NULL, ("Eternal cdev is destroyed")); 223 *devp = dev; 224 return (csw); 225 } 226 227 csw = NULL; 228 dev_lock(); 229 dev = vp->v_rdev; 230 if (dev == NULL) { 231 dev_unlock(); 232 return (NULL); 233 } 234 cdp = cdev2priv(dev); 235 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) { 236 csw = dev->si_devsw; 237 if (csw != NULL) 238 dev->si_threadcount++; 239 } 240 dev_unlock(); 241 if (csw != NULL) { 242 *devp = dev; 243 *ref = 1; 244 } 245 return (csw); 246 } 247 248 void 249 dev_relthread(struct cdev *dev, int ref) 250 { 251 252 mtx_assert(&devmtx, MA_NOTOWNED); 253 if (!ref) 254 return; 255 dev_lock(); 256 KASSERT(dev->si_threadcount > 0, 257 ("%s threadcount is wrong", dev->si_name)); 258 dev->si_threadcount--; 259 dev_unlock(); 260 } 261 262 int 263 nullop(void) 264 { 265 266 return (0); 267 } 268 269 int 270 eopnotsupp(void) 271 { 272 273 return (EOPNOTSUPP); 274 } 275 276 static int 277 enxio(void) 278 { 279 return (ENXIO); 280 } 281 282 static int 283 enodev(void) 284 { 285 return (ENODEV); 286 } 287 288 /* Define a dead_cdevsw for use when devices leave unexpectedly. */ 289 290 #define dead_open (d_open_t *)enxio 291 #define dead_close (d_close_t *)enxio 292 #define dead_read (d_read_t *)enxio 293 #define dead_write (d_write_t *)enxio 294 #define dead_ioctl (d_ioctl_t *)enxio 295 #define dead_poll (d_poll_t *)enodev 296 #define dead_mmap (d_mmap_t *)enodev 297 298 static void 299 dead_strategy(struct bio *bp) 300 { 301 302 biofinish(bp, NULL, ENXIO); 303 } 304 305 #define dead_dump (dumper_t *)enxio 306 #define dead_kqfilter (d_kqfilter_t *)enxio 307 #define dead_mmap_single (d_mmap_single_t *)enodev 308 309 static struct cdevsw dead_cdevsw = { 310 .d_version = D_VERSION, 311 .d_open = dead_open, 312 .d_close = dead_close, 313 .d_read = dead_read, 314 .d_write = dead_write, 315 .d_ioctl = dead_ioctl, 316 .d_poll = dead_poll, 317 .d_mmap = dead_mmap, 318 .d_strategy = dead_strategy, 319 .d_name = "dead", 320 .d_dump = dead_dump, 321 .d_kqfilter = dead_kqfilter, 322 .d_mmap_single = dead_mmap_single 323 }; 324 325 /* Default methods if driver does not specify method */ 326 327 #define null_open (d_open_t *)nullop 328 #define null_close (d_close_t *)nullop 329 #define no_read (d_read_t *)enodev 330 #define no_write (d_write_t *)enodev 331 #define no_ioctl (d_ioctl_t *)enodev 332 #define no_mmap (d_mmap2_t *)enodev 333 #define no_kqfilter (d_kqfilter_t *)enodev 334 #define no_mmap_single (d_mmap_single_t *)enodev 335 336 static void 337 no_strategy(struct bio *bp) 338 { 339 340 biofinish(bp, NULL, ENODEV); 341 } 342 343 static int 344 no_poll(struct cdev *dev __unused, int events, struct thread *td __unused) 345 { 346 347 return (poll_no_poll(events)); 348 } 349 350 #define no_dump (dumper_t *)enodev 351 352 static int 353 giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 354 { 355 struct cdevsw *dsw; 356 int ref, retval; 357 358 dsw = dev_refthread(dev, &ref); 359 if (dsw == NULL) 360 return (ENXIO); 361 mtx_lock(&Giant); 362 retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td); 363 mtx_unlock(&Giant); 364 dev_relthread(dev, ref); 365 return (retval); 366 } 367 368 static int 369 giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp) 370 { 371 struct cdevsw *dsw; 372 int ref, retval; 373 374 dsw = dev_refthread(dev, &ref); 375 if (dsw == NULL) 376 return (ENXIO); 377 mtx_lock(&Giant); 378 retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp); 379 mtx_unlock(&Giant); 380 dev_relthread(dev, ref); 381 return (retval); 382 } 383 384 static int 385 giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 386 { 387 struct cdevsw *dsw; 388 int ref, retval; 389 390 dsw = dev_refthread(dev, &ref); 391 if (dsw == NULL) 392 return (ENXIO); 393 mtx_lock(&Giant); 394 retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td); 395 mtx_unlock(&Giant); 396 dev_relthread(dev, ref); 397 return (retval); 398 } 399 400 static void 401 giant_strategy(struct bio *bp) 402 { 403 struct cdevsw *dsw; 404 struct cdev *dev; 405 int ref; 406 407 dev = bp->bio_dev; 408 dsw = dev_refthread(dev, &ref); 409 if (dsw == NULL) { 410 biofinish(bp, NULL, ENXIO); 411 return; 412 } 413 mtx_lock(&Giant); 414 dsw->d_gianttrick->d_strategy(bp); 415 mtx_unlock(&Giant); 416 dev_relthread(dev, ref); 417 } 418 419 static int 420 giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 421 { 422 struct cdevsw *dsw; 423 int ref, retval; 424 425 dsw = dev_refthread(dev, &ref); 426 if (dsw == NULL) 427 return (ENXIO); 428 mtx_lock(&Giant); 429 retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td); 430 mtx_unlock(&Giant); 431 dev_relthread(dev, ref); 432 return (retval); 433 } 434 435 static int 436 giant_read(struct cdev *dev, struct uio *uio, int ioflag) 437 { 438 struct cdevsw *dsw; 439 int ref, retval; 440 441 dsw = dev_refthread(dev, &ref); 442 if (dsw == NULL) 443 return (ENXIO); 444 mtx_lock(&Giant); 445 retval = dsw->d_gianttrick->d_read(dev, uio, ioflag); 446 mtx_unlock(&Giant); 447 dev_relthread(dev, ref); 448 return (retval); 449 } 450 451 static int 452 giant_write(struct cdev *dev, struct uio *uio, int ioflag) 453 { 454 struct cdevsw *dsw; 455 int ref, retval; 456 457 dsw = dev_refthread(dev, &ref); 458 if (dsw == NULL) 459 return (ENXIO); 460 mtx_lock(&Giant); 461 retval = dsw->d_gianttrick->d_write(dev, uio, ioflag); 462 mtx_unlock(&Giant); 463 dev_relthread(dev, ref); 464 return (retval); 465 } 466 467 static int 468 giant_poll(struct cdev *dev, int events, struct thread *td) 469 { 470 struct cdevsw *dsw; 471 int ref, retval; 472 473 dsw = dev_refthread(dev, &ref); 474 if (dsw == NULL) 475 return (ENXIO); 476 mtx_lock(&Giant); 477 retval = dsw->d_gianttrick->d_poll(dev, events, td); 478 mtx_unlock(&Giant); 479 dev_relthread(dev, ref); 480 return (retval); 481 } 482 483 static int 484 giant_kqfilter(struct cdev *dev, struct knote *kn) 485 { 486 struct cdevsw *dsw; 487 int ref, retval; 488 489 dsw = dev_refthread(dev, &ref); 490 if (dsw == NULL) 491 return (ENXIO); 492 mtx_lock(&Giant); 493 retval = dsw->d_gianttrick->d_kqfilter(dev, kn); 494 mtx_unlock(&Giant); 495 dev_relthread(dev, ref); 496 return (retval); 497 } 498 499 static int 500 giant_mmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot, 501 vm_memattr_t *memattr) 502 { 503 struct cdevsw *dsw; 504 int ref, retval; 505 506 dsw = dev_refthread(dev, &ref); 507 if (dsw == NULL) 508 return (ENXIO); 509 mtx_lock(&Giant); 510 if (dsw->d_gianttrick->d_flags & D_MMAP2) 511 retval = dsw->d_gianttrick->d_mmap2(dev, offset, paddr, nprot, 512 memattr); 513 else 514 retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot); 515 mtx_unlock(&Giant); 516 dev_relthread(dev, ref); 517 return (retval); 518 } 519 520 static int 521 giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size, 522 vm_object_t *object, int nprot) 523 { 524 struct cdevsw *dsw; 525 int ref, retval; 526 527 dsw = dev_refthread(dev, &ref); 528 if (dsw == NULL) 529 return (ENXIO); 530 mtx_lock(&Giant); 531 retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object, 532 nprot); 533 mtx_unlock(&Giant); 534 dev_relthread(dev, ref); 535 return (retval); 536 } 537 538 static void 539 notify(struct cdev *dev, const char *ev, int flags) 540 { 541 static const char prefix[] = "cdev="; 542 char *data; 543 int namelen, mflags; 544 545 if (cold) 546 return; 547 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; 548 namelen = strlen(dev->si_name); 549 data = malloc(namelen + sizeof(prefix), M_TEMP, mflags); 550 if (data == NULL) 551 return; 552 memcpy(data, prefix, sizeof(prefix) - 1); 553 memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1); 554 devctl_notify_f("DEVFS", "CDEV", ev, data, mflags); 555 free(data, M_TEMP); 556 } 557 558 static void 559 notify_create(struct cdev *dev, int flags) 560 { 561 562 notify(dev, "CREATE", flags); 563 } 564 565 static void 566 notify_destroy(struct cdev *dev) 567 { 568 569 notify(dev, "DESTROY", MAKEDEV_WAITOK); 570 } 571 572 static struct cdev * 573 newdev(struct cdevsw *csw, int unit, struct cdev *si) 574 { 575 struct cdev *si2; 576 577 mtx_assert(&devmtx, MA_OWNED); 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) == unit) { 582 dev_free_devlocked(si); 583 return (si2); 584 } 585 } 586 } 587 si->si_drv0 = unit; 588 si->si_devsw = csw; 589 LIST_INSERT_HEAD(&csw->d_devs, si, si_list); 590 return (si); 591 } 592 593 static void 594 fini_cdevsw(struct cdevsw *devsw) 595 { 596 struct cdevsw *gt; 597 598 if (devsw->d_gianttrick != NULL) { 599 gt = devsw->d_gianttrick; 600 memcpy(devsw, gt, sizeof *devsw); 601 cdevsw_free_devlocked(gt); 602 devsw->d_gianttrick = NULL; 603 } 604 devsw->d_flags &= ~D_INIT; 605 } 606 607 static int 608 prep_cdevsw(struct cdevsw *devsw, int flags) 609 { 610 struct cdevsw *dsw2; 611 612 mtx_assert(&devmtx, MA_OWNED); 613 if (devsw->d_flags & D_INIT) 614 return (0); 615 if (devsw->d_flags & D_NEEDGIANT) { 616 dev_unlock(); 617 dsw2 = malloc(sizeof *dsw2, M_DEVT, 618 (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK); 619 dev_lock(); 620 if (dsw2 == NULL && !(devsw->d_flags & D_INIT)) 621 return (ENOMEM); 622 } else 623 dsw2 = NULL; 624 if (devsw->d_flags & D_INIT) { 625 if (dsw2 != NULL) 626 cdevsw_free_devlocked(dsw2); 627 return (0); 628 } 629 630 if (devsw->d_version != D_VERSION_01 && 631 devsw->d_version != D_VERSION_02) { 632 printf( 633 "WARNING: Device driver \"%s\" has wrong version %s\n", 634 devsw->d_name == NULL ? "???" : devsw->d_name, 635 "and is disabled. Recompile KLD module."); 636 devsw->d_open = dead_open; 637 devsw->d_close = dead_close; 638 devsw->d_read = dead_read; 639 devsw->d_write = dead_write; 640 devsw->d_ioctl = dead_ioctl; 641 devsw->d_poll = dead_poll; 642 devsw->d_mmap = dead_mmap; 643 devsw->d_strategy = dead_strategy; 644 devsw->d_dump = dead_dump; 645 devsw->d_kqfilter = dead_kqfilter; 646 } 647 if (devsw->d_version == D_VERSION_01) 648 devsw->d_mmap_single = NULL; 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 devsw->d_flags |= D_MMAP2; 655 dsw2 = NULL; 656 } 657 } 658 659 #define FIXUP(member, noop, giant) \ 660 do { \ 661 if (devsw->member == NULL) { \ 662 devsw->member = noop; \ 663 } else if (devsw->d_flags & D_NEEDGIANT) \ 664 devsw->member = giant; \ 665 } \ 666 while (0) 667 668 FIXUP(d_open, null_open, giant_open); 669 FIXUP(d_fdopen, NULL, giant_fdopen); 670 FIXUP(d_close, null_close, giant_close); 671 FIXUP(d_read, no_read, giant_read); 672 FIXUP(d_write, no_write, giant_write); 673 FIXUP(d_ioctl, no_ioctl, giant_ioctl); 674 FIXUP(d_poll, no_poll, giant_poll); 675 FIXUP(d_mmap2, no_mmap, giant_mmap); 676 FIXUP(d_strategy, no_strategy, giant_strategy); 677 FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter); 678 FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single); 679 680 if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 681 682 LIST_INIT(&devsw->d_devs); 683 684 devsw->d_flags |= D_INIT; 685 686 if (dsw2 != NULL) 687 cdevsw_free_devlocked(dsw2); 688 return (0); 689 } 690 691 static int 692 make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit, 693 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 694 va_list ap) 695 { 696 struct cdev *dev; 697 int i, res; 698 699 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, 700 ("make_dev_credv: both WAITOK and NOWAIT specified")); 701 dev = devfs_alloc(flags); 702 if (dev == NULL) 703 return (ENOMEM); 704 dev_lock(); 705 res = prep_cdevsw(devsw, flags); 706 if (res != 0) { 707 dev_unlock(); 708 devfs_free(dev); 709 return (res); 710 } 711 dev = newdev(devsw, unit, dev); 712 if (flags & MAKEDEV_REF) 713 dev_refl(dev); 714 if (flags & MAKEDEV_ETERNAL) 715 dev->si_flags |= SI_ETERNAL; 716 if (dev->si_flags & SI_CHEAPCLONE && 717 dev->si_flags & SI_NAMED) { 718 /* 719 * This is allowed as it removes races and generally 720 * simplifies cloning devices. 721 * XXX: still ?? 722 */ 723 dev_unlock_and_free(); 724 *dres = dev; 725 return (0); 726 } 727 KASSERT(!(dev->si_flags & SI_NAMED), 728 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", 729 devsw->d_name, dev2unit(dev), devtoname(dev))); 730 731 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 732 if (i > (sizeof dev->__si_namebuf - 1)) { 733 printf("WARNING: Device name truncated! (%s)\n", 734 dev->__si_namebuf); 735 } 736 737 dev->si_flags |= SI_NAMED; 738 if (cr != NULL) 739 dev->si_cred = crhold(cr); 740 dev->si_uid = uid; 741 dev->si_gid = gid; 742 dev->si_mode = mode; 743 744 devfs_create(dev); 745 clean_unrhdrl(devfs_inos); 746 dev_unlock_and_free(); 747 748 notify_create(dev, flags); 749 750 *dres = dev; 751 return (0); 752 } 753 754 struct cdev * 755 make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode, 756 const char *fmt, ...) 757 { 758 struct cdev *dev; 759 va_list ap; 760 int res; 761 762 va_start(ap, fmt); 763 res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt, 764 ap); 765 va_end(ap); 766 KASSERT(res == 0 && dev != NULL, ("make_dev: failed make_dev_credv")); 767 return (dev); 768 } 769 770 struct cdev * 771 make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid, 772 gid_t gid, int mode, const char *fmt, ...) 773 { 774 struct cdev *dev; 775 va_list ap; 776 int res; 777 778 va_start(ap, fmt); 779 res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap); 780 va_end(ap); 781 782 KASSERT(res == 0 && dev != NULL, 783 ("make_dev_cred: failed make_dev_credv")); 784 return (dev); 785 } 786 787 struct cdev * 788 make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr, 789 uid_t uid, gid_t gid, int mode, const char *fmt, ...) 790 { 791 struct cdev *dev; 792 va_list ap; 793 int res; 794 795 va_start(ap, fmt); 796 res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode, 797 fmt, ap); 798 va_end(ap); 799 800 KASSERT((flags & MAKEDEV_NOWAIT) != 0 || res == 0, 801 ("make_dev_credf: failed make_dev_credv")); 802 return (res == 0 ? dev : NULL); 803 } 804 805 int 806 make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw, 807 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...) 808 { 809 va_list ap; 810 int res; 811 812 va_start(ap, fmt); 813 res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode, 814 fmt, ap); 815 va_end(ap); 816 817 KASSERT((flags & MAKEDEV_NOWAIT) != 0 || res == 0, 818 ("make_dev_p: failed make_dev_credv")); 819 return (res); 820 } 821 822 static void 823 dev_dependsl(struct cdev *pdev, struct cdev *cdev) 824 { 825 826 cdev->si_parent = pdev; 827 cdev->si_flags |= SI_CHILD; 828 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 829 } 830 831 832 void 833 dev_depends(struct cdev *pdev, struct cdev *cdev) 834 { 835 836 dev_lock(); 837 dev_dependsl(pdev, cdev); 838 dev_unlock(); 839 } 840 841 struct cdev * 842 make_dev_alias(struct cdev *pdev, const char *fmt, ...) 843 { 844 struct cdev *dev; 845 va_list ap; 846 int i; 847 848 KASSERT(pdev != NULL, ("NULL pdev")); 849 dev = devfs_alloc(MAKEDEV_WAITOK); 850 dev_lock(); 851 dev->si_flags |= SI_ALIAS; 852 dev->si_flags |= SI_NAMED; 853 va_start(ap, fmt); 854 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); 855 if (i > (sizeof dev->__si_namebuf - 1)) { 856 printf("WARNING: Device name truncated! (%s)\n", 857 dev->__si_namebuf); 858 } 859 va_end(ap); 860 861 devfs_create(dev); 862 dev_dependsl(pdev, dev); 863 clean_unrhdrl(devfs_inos); 864 dev_unlock(); 865 866 notify_create(dev, MAKEDEV_WAITOK); 867 868 return (dev); 869 } 870 871 static void 872 destroy_devl(struct cdev *dev) 873 { 874 struct cdevsw *csw; 875 struct cdev_privdata *p; 876 struct cdev_priv *cdp; 877 878 mtx_assert(&devmtx, MA_OWNED); 879 KASSERT(dev->si_flags & SI_NAMED, 880 ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev))); 881 KASSERT((dev->si_flags & SI_ETERNAL) == 0, 882 ("WARNING: Driver mistake: destroy_dev on eternal %d\n", 883 dev2unit(dev))); 884 885 cdp = cdev2priv(dev); 886 if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) { 887 /* 888 * Avoid race with dev_rel(), e.g. from the populate 889 * loop. If CDP_UNREF_DTR flag is set, the reference 890 * to be dropped at the end of destroy_devl() was 891 * already taken by delist_dev_locked(). 892 */ 893 dev_refl(dev); 894 895 devfs_destroy(dev); 896 } 897 898 /* Remove name marking */ 899 dev->si_flags &= ~SI_NAMED; 900 901 /* If we are a child, remove us from the parents list */ 902 if (dev->si_flags & SI_CHILD) { 903 LIST_REMOVE(dev, si_siblings); 904 dev->si_flags &= ~SI_CHILD; 905 } 906 907 /* Kill our children */ 908 while (!LIST_EMPTY(&dev->si_children)) 909 destroy_devl(LIST_FIRST(&dev->si_children)); 910 911 /* Remove from clone list */ 912 if (dev->si_flags & SI_CLONELIST) { 913 LIST_REMOVE(dev, si_clone); 914 dev->si_flags &= ~SI_CLONELIST; 915 } 916 917 csw = dev->si_devsw; 918 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 919 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 920 csw->d_purge(dev); 921 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 922 if (dev->si_threadcount) 923 printf("Still %lu threads in %s\n", 924 dev->si_threadcount, devtoname(dev)); 925 } 926 while (dev->si_threadcount != 0) { 927 /* Use unique dummy wait ident */ 928 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10); 929 } 930 931 dev_unlock(); 932 if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) { 933 /* avoid out of order notify events */ 934 notify_destroy(dev); 935 } 936 mtx_lock(&cdevpriv_mtx); 937 while ((p = LIST_FIRST(&cdp->cdp_fdpriv)) != NULL) { 938 devfs_destroy_cdevpriv(p); 939 mtx_lock(&cdevpriv_mtx); 940 } 941 mtx_unlock(&cdevpriv_mtx); 942 dev_lock(); 943 944 dev->si_drv1 = 0; 945 dev->si_drv2 = 0; 946 bzero(&dev->__si_u, sizeof(dev->__si_u)); 947 948 if (!(dev->si_flags & SI_ALIAS)) { 949 /* Remove from cdevsw list */ 950 LIST_REMOVE(dev, si_list); 951 952 /* If cdevsw has no more struct cdev *'s, clean it */ 953 if (LIST_EMPTY(&csw->d_devs)) { 954 fini_cdevsw(csw); 955 wakeup(&csw->d_devs); 956 } 957 } 958 dev->si_flags &= ~SI_ALIAS; 959 cdp->cdp_flags &= ~CDP_UNREF_DTR; 960 dev->si_refcount--; 961 962 if (dev->si_refcount > 0) 963 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 964 else 965 dev_free_devlocked(dev); 966 } 967 968 static void 969 delist_dev_locked(struct cdev *dev) 970 { 971 struct cdev_priv *cdp; 972 struct cdev *child; 973 974 mtx_assert(&devmtx, MA_OWNED); 975 cdp = cdev2priv(dev); 976 if ((cdp->cdp_flags & CDP_UNREF_DTR) != 0) 977 return; 978 cdp->cdp_flags |= CDP_UNREF_DTR; 979 dev_refl(dev); 980 devfs_destroy(dev); 981 LIST_FOREACH(child, &dev->si_children, si_siblings) 982 delist_dev_locked(child); 983 dev_unlock(); 984 /* ensure the destroy event is queued in order */ 985 notify_destroy(dev); 986 dev_lock(); 987 } 988 989 /* 990 * This function will delist a character device and its children from 991 * the directory listing and create a destroy event without waiting 992 * for all character device references to go away. At some later point 993 * destroy_dev() must be called to complete the character device 994 * destruction. After calling this function the character device name 995 * can instantly be re-used. 996 */ 997 void 998 delist_dev(struct cdev *dev) 999 { 1000 1001 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "delist_dev"); 1002 dev_lock(); 1003 delist_dev_locked(dev); 1004 dev_unlock(); 1005 } 1006 1007 void 1008 destroy_dev(struct cdev *dev) 1009 { 1010 1011 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev"); 1012 dev_lock(); 1013 destroy_devl(dev); 1014 dev_unlock_and_free(); 1015 } 1016 1017 const char * 1018 devtoname(struct cdev *dev) 1019 { 1020 1021 return (dev->si_name); 1022 } 1023 1024 int 1025 dev_stdclone(char *name, char **namep, const char *stem, int *unit) 1026 { 1027 int u, i; 1028 1029 i = strlen(stem); 1030 if (bcmp(stem, name, i) != 0) 1031 return (0); 1032 if (!isdigit(name[i])) 1033 return (0); 1034 u = 0; 1035 if (name[i] == '' && isdigit(name[i+1])) 1036 return (0); 1037 while (isdigit(name[i])) { 1038 u *= 10; 1039 u += name[i++] - ''; 1040 } 1041 if (u > 0xffffff) 1042 return (0); 1043 *unit = u; 1044 if (namep) 1045 *namep = &name[i]; 1046 if (name[i]) 1047 return (2); 1048 return (1); 1049 } 1050 1051 /* 1052 * Helper functions for cloning device drivers. 1053 * 1054 * The objective here is to make it unnecessary for the device drivers to 1055 * use rman or similar to manage their unit number space. Due to the way 1056 * we do "on-demand" devices, using rman or other "private" methods 1057 * will be very tricky to lock down properly once we lock down this file. 1058 * 1059 * Instead we give the drivers these routines which puts the struct cdev *'s 1060 * that are to be managed on their own list, and gives the driver the ability 1061 * to ask for the first free unit number or a given specified unit number. 1062 * 1063 * In addition these routines support paired devices (pty, nmdm and similar) 1064 * by respecting a number of "flag" bits in the minor number. 1065 * 1066 */ 1067 1068 struct clonedevs { 1069 LIST_HEAD(,cdev) head; 1070 }; 1071 1072 void 1073 clone_setup(struct clonedevs **cdp) 1074 { 1075 1076 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 1077 LIST_INIT(&(*cdp)->head); 1078 } 1079 1080 int 1081 clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, 1082 struct cdev **dp, int extra) 1083 { 1084 struct clonedevs *cd; 1085 struct cdev *dev, *ndev, *dl, *de; 1086 int unit, low, u; 1087 1088 KASSERT(*cdp != NULL, 1089 ("clone_setup() not called in driver \"%s\"", csw->d_name)); 1090 KASSERT(!(extra & CLONE_UNITMASK), 1091 ("Illegal extra bits (0x%x) in clone_create", extra)); 1092 KASSERT(*up <= CLONE_UNITMASK, 1093 ("Too high unit (0x%x) in clone_create", *up)); 1094 KASSERT(csw->d_flags & D_NEEDMINOR, 1095 ("clone_create() on cdevsw without minor numbers")); 1096 1097 1098 /* 1099 * Search the list for a lot of things in one go: 1100 * A preexisting match is returned immediately. 1101 * The lowest free unit number if we are passed -1, and the place 1102 * in the list where we should insert that new element. 1103 * The place to insert a specified unit number, if applicable 1104 * the end of the list. 1105 */ 1106 unit = *up; 1107 ndev = devfs_alloc(MAKEDEV_WAITOK); 1108 dev_lock(); 1109 prep_cdevsw(csw, MAKEDEV_WAITOK); 1110 low = extra; 1111 de = dl = NULL; 1112 cd = *cdp; 1113 LIST_FOREACH(dev, &cd->head, si_clone) { 1114 KASSERT(dev->si_flags & SI_CLONELIST, 1115 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1116 u = dev2unit(dev); 1117 if (u == (unit | extra)) { 1118 *dp = dev; 1119 dev_unlock(); 1120 devfs_free(ndev); 1121 return (0); 1122 } 1123 if (unit == -1 && u == low) { 1124 low++; 1125 de = dev; 1126 continue; 1127 } else if (u < (unit | extra)) { 1128 de = dev; 1129 continue; 1130 } else if (u > (unit | extra)) { 1131 dl = dev; 1132 break; 1133 } 1134 } 1135 if (unit == -1) 1136 unit = low & CLONE_UNITMASK; 1137 dev = newdev(csw, unit | extra, ndev); 1138 if (dev->si_flags & SI_CLONELIST) { 1139 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 1140 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra); 1141 LIST_FOREACH(dev, &cd->head, si_clone) { 1142 printf("\t%p %s\n", dev, dev->si_name); 1143 } 1144 panic("foo"); 1145 } 1146 KASSERT(!(dev->si_flags & SI_CLONELIST), 1147 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 1148 if (dl != NULL) 1149 LIST_INSERT_BEFORE(dl, dev, si_clone); 1150 else if (de != NULL) 1151 LIST_INSERT_AFTER(de, dev, si_clone); 1152 else 1153 LIST_INSERT_HEAD(&cd->head, dev, si_clone); 1154 dev->si_flags |= SI_CLONELIST; 1155 *up = unit; 1156 dev_unlock_and_free(); 1157 return (1); 1158 } 1159 1160 /* 1161 * Kill everything still on the list. The driver should already have 1162 * disposed of any softc hung of the struct cdev *'s at this time. 1163 */ 1164 void 1165 clone_cleanup(struct clonedevs **cdp) 1166 { 1167 struct cdev *dev; 1168 struct cdev_priv *cp; 1169 struct clonedevs *cd; 1170 1171 cd = *cdp; 1172 if (cd == NULL) 1173 return; 1174 dev_lock(); 1175 while (!LIST_EMPTY(&cd->head)) { 1176 dev = LIST_FIRST(&cd->head); 1177 LIST_REMOVE(dev, si_clone); 1178 KASSERT(dev->si_flags & SI_CLONELIST, 1179 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1180 dev->si_flags &= ~SI_CLONELIST; 1181 cp = cdev2priv(dev); 1182 if (!(cp->cdp_flags & CDP_SCHED_DTR)) { 1183 cp->cdp_flags |= CDP_SCHED_DTR; 1184 KASSERT(dev->si_flags & SI_NAMED, 1185 ("Driver has goofed in cloning underways udev %x unit %x", dev2udev(dev), dev2unit(dev))); 1186 destroy_devl(dev); 1187 } 1188 } 1189 dev_unlock_and_free(); 1190 free(cd, M_DEVBUF); 1191 *cdp = NULL; 1192 } 1193 1194 static TAILQ_HEAD(, cdev_priv) dev_ddtr = 1195 TAILQ_HEAD_INITIALIZER(dev_ddtr); 1196 static struct task dev_dtr_task; 1197 1198 static void 1199 destroy_dev_tq(void *ctx, int pending) 1200 { 1201 struct cdev_priv *cp; 1202 struct cdev *dev; 1203 void (*cb)(void *); 1204 void *cb_arg; 1205 1206 dev_lock(); 1207 while (!TAILQ_EMPTY(&dev_ddtr)) { 1208 cp = TAILQ_FIRST(&dev_ddtr); 1209 dev = &cp->cdp_c; 1210 KASSERT(cp->cdp_flags & CDP_SCHED_DTR, 1211 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp)); 1212 TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list); 1213 cb = cp->cdp_dtr_cb; 1214 cb_arg = cp->cdp_dtr_cb_arg; 1215 destroy_devl(dev); 1216 dev_unlock_and_free(); 1217 dev_rel(dev); 1218 if (cb != NULL) 1219 cb(cb_arg); 1220 dev_lock(); 1221 } 1222 dev_unlock(); 1223 } 1224 1225 /* 1226 * devmtx shall be locked on entry. devmtx will be unlocked after 1227 * function return. 1228 */ 1229 static int 1230 destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg) 1231 { 1232 struct cdev_priv *cp; 1233 1234 mtx_assert(&devmtx, MA_OWNED); 1235 cp = cdev2priv(dev); 1236 if (cp->cdp_flags & CDP_SCHED_DTR) { 1237 dev_unlock(); 1238 return (0); 1239 } 1240 dev_refl(dev); 1241 cp->cdp_flags |= CDP_SCHED_DTR; 1242 cp->cdp_dtr_cb = cb; 1243 cp->cdp_dtr_cb_arg = arg; 1244 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list); 1245 dev_unlock(); 1246 taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task); 1247 return (1); 1248 } 1249 1250 int 1251 destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg) 1252 { 1253 1254 dev_lock(); 1255 return (destroy_dev_sched_cbl(dev, cb, arg)); 1256 } 1257 1258 int 1259 destroy_dev_sched(struct cdev *dev) 1260 { 1261 1262 return (destroy_dev_sched_cb(dev, NULL, NULL)); 1263 } 1264 1265 void 1266 destroy_dev_drain(struct cdevsw *csw) 1267 { 1268 1269 dev_lock(); 1270 while (!LIST_EMPTY(&csw->d_devs)) { 1271 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10); 1272 } 1273 dev_unlock(); 1274 } 1275 1276 void 1277 drain_dev_clone_events(void) 1278 { 1279 1280 sx_xlock(&clone_drain_lock); 1281 sx_xunlock(&clone_drain_lock); 1282 } 1283 1284 static void 1285 devdtr_init(void *dummy __unused) 1286 { 1287 1288 TASK_INIT(&dev_dtr_task, 0, destroy_dev_tq, NULL); 1289 } 1290 1291 SYSINIT(devdtr, SI_SUB_DEVFS, SI_ORDER_SECOND, devdtr_init, NULL); 1292 1293 #include "opt_ddb.h" 1294 #ifdef DDB 1295 #include <sys/kernel.h> 1296 1297 #include <ddb/ddb.h> 1298 1299 DB_SHOW_COMMAND(cdev, db_show_cdev) 1300 { 1301 struct cdev_priv *cdp; 1302 struct cdev *dev; 1303 u_int flags; 1304 char buf[512]; 1305 1306 if (!have_addr) { 1307 TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { 1308 dev = &cdp->cdp_c; 1309 db_printf("%s %p\n", dev->si_name, dev); 1310 if (db_pager_quit) 1311 break; 1312 } 1313 return; 1314 } 1315 1316 dev = (struct cdev *)addr; 1317 cdp = cdev2priv(dev); 1318 db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n", 1319 dev->si_name, dev->si_refcount, dev->si_usecount, 1320 dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first); 1321 db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n", 1322 dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2); 1323 flags = dev->si_flags; 1324 #define SI_FLAG(flag) do { \ 1325 if (flags & (flag)) { \ 1326 if (buf[0] != '\0') \ 1327 strlcat(buf, ", ", sizeof(buf)); \ 1328 strlcat(buf, (#flag) + 3, sizeof(buf)); \ 1329 flags &= ~(flag); \ 1330 } \ 1331 } while (0) 1332 buf[0] = '\0'; 1333 SI_FLAG(SI_ETERNAL); 1334 SI_FLAG(SI_ALIAS); 1335 SI_FLAG(SI_NAMED); 1336 SI_FLAG(SI_CHEAPCLONE); 1337 SI_FLAG(SI_CHILD); 1338 SI_FLAG(SI_DEVOPEN); 1339 SI_FLAG(SI_CONSOPEN); 1340 SI_FLAG(SI_DUMPDEV); 1341 SI_FLAG(SI_CANDELETE); 1342 SI_FLAG(SI_CLONELIST); 1343 db_printf("si_flags %s\n", buf); 1344 1345 flags = cdp->cdp_flags; 1346 #define CDP_FLAG(flag) do { \ 1347 if (flags & (flag)) { \ 1348 if (buf[0] != '\0') \ 1349 strlcat(buf, ", ", sizeof(buf)); \ 1350 strlcat(buf, (#flag) + 4, sizeof(buf)); \ 1351 flags &= ~(flag); \ 1352 } \ 1353 } while (0) 1354 buf[0] = '\0'; 1355 CDP_FLAG(CDP_ACTIVE); 1356 CDP_FLAG(CDP_SCHED_DTR); 1357 db_printf("cdp_flags %s\n", buf); 1358 } 1359 #endif
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