kern_conf.c revision 256885
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: head/sys/kern/kern_conf.c 256885 2013-10-22 10:40:26Z mav $"); 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 52static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage"); 53 54struct mtx devmtx; 55static void destroy_devl(struct cdev *dev); 56static int destroy_dev_sched_cbl(struct cdev *dev, 57 void (*cb)(void *), void *arg); 58static void destroy_dev_tq(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 mtx_assert(&devmtx, MA_OWNED); 90 91 /* 92 * Make the local copy of the list heads while the dev_mtx is 93 * held. Free it later. 94 */ 95 TAILQ_INIT(&cdp_free); 96 TAILQ_CONCAT(&cdp_free, &cdevp_free_list, cdp_list); 97 csw_free = cdevsw_gt_post_list; 98 SLIST_INIT(&cdevsw_gt_post_list); 99 100 mtx_unlock(&devmtx); 101 102 while ((cdp = TAILQ_FIRST(&cdp_free)) != NULL) { 103 TAILQ_REMOVE(&cdp_free, cdp, cdp_list); 104 devfs_free(&cdp->cdp_c); 105 } 106 while ((csw = SLIST_FIRST(&csw_free)) != NULL) { 107 SLIST_REMOVE_HEAD(&csw_free, d_postfree_list); 108 free(csw, M_DEVT); 109 } 110} 111 112static void 113dev_free_devlocked(struct cdev *cdev) 114{ 115 struct cdev_priv *cdp; 116 117 mtx_assert(&devmtx, MA_OWNED); 118 cdp = cdev2priv(cdev); 119 TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list); 120} 121 122static void 123cdevsw_free_devlocked(struct cdevsw *csw) 124{ 125 126 mtx_assert(&devmtx, MA_OWNED); 127 SLIST_INSERT_HEAD(&cdevsw_gt_post_list, csw, d_postfree_list); 128} 129 130void 131dev_unlock(void) 132{ 133 134 mtx_unlock(&devmtx); 135} 136 137void 138dev_ref(struct cdev *dev) 139{ 140 141 mtx_assert(&devmtx, MA_NOTOWNED); 142 mtx_lock(&devmtx); 143 dev->si_refcount++; 144 mtx_unlock(&devmtx); 145} 146 147void 148dev_refl(struct cdev *dev) 149{ 150 151 mtx_assert(&devmtx, MA_OWNED); 152 dev->si_refcount++; 153} 154 155void 156dev_rel(struct cdev *dev) 157{ 158 int flag = 0; 159 160 mtx_assert(&devmtx, MA_NOTOWNED); 161 dev_lock(); 162 dev->si_refcount--; 163 KASSERT(dev->si_refcount >= 0, 164 ("dev_rel(%s) gave negative count", devtoname(dev))); 165#if 0 166 if (dev->si_usecount == 0 && 167 (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED)) 168 ; 169 else 170#endif 171 if (dev->si_devsw == NULL && dev->si_refcount == 0) { 172 LIST_REMOVE(dev, si_list); 173 flag = 1; 174 } 175 dev_unlock(); 176 if (flag) 177 devfs_free(dev); 178} 179 180struct cdevsw * 181dev_refthread(struct cdev *dev, int *ref) 182{ 183 struct cdevsw *csw; 184 struct cdev_priv *cdp; 185 186 mtx_assert(&devmtx, MA_NOTOWNED); 187 if ((dev->si_flags & SI_ETERNAL) != 0) { 188 *ref = 0; 189 return (dev->si_devsw); 190 } 191 dev_lock(); 192 csw = dev->si_devsw; 193 if (csw != NULL) { 194 cdp = cdev2priv(dev); 195 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) 196 atomic_add_long(&dev->si_threadcount, 1); 197 else 198 csw = NULL; 199 } 200 dev_unlock(); 201 *ref = 1; 202 return (csw); 203} 204 205struct cdevsw * 206devvn_refthread(struct vnode *vp, struct cdev **devp, int *ref) 207{ 208 struct cdevsw *csw; 209 struct cdev_priv *cdp; 210 struct cdev *dev; 211 212 mtx_assert(&devmtx, MA_NOTOWNED); 213 if ((vp->v_vflag & VV_ETERNALDEV) != 0) { 214 dev = vp->v_rdev; 215 if (dev == NULL) 216 return (NULL); 217 KASSERT((dev->si_flags & SI_ETERNAL) != 0, 218 ("Not eternal cdev")); 219 *ref = 0; 220 csw = dev->si_devsw; 221 KASSERT(csw != NULL, ("Eternal cdev is destroyed")); 222 *devp = dev; 223 return (csw); 224 } 225 226 csw = NULL; 227 dev_lock(); 228 dev = vp->v_rdev; 229 if (dev == NULL) { 230 dev_unlock(); 231 return (NULL); 232 } 233 cdp = cdev2priv(dev); 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 dev_unlock(); 240 if (csw != NULL) { 241 *devp = dev; 242 *ref = 1; 243 } 244 return (csw); 245} 246 247void 248dev_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 259int 260nullop(void) 261{ 262 263 return (0); 264} 265 266int 267eopnotsupp(void) 268{ 269 270 return (EOPNOTSUPP); 271} 272 273static int 274enxio(void) 275{ 276 return (ENXIO); 277} 278 279static int 280enodev(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 295static void 296dead_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 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_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 333static void 334no_strategy(struct bio *bp) 335{ 336 337 biofinish(bp, NULL, ENODEV); 338} 339 340static int 341no_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 349static int 350giant_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 365static int 366giant_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 381static int 382giant_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 397static void 398giant_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 416static int 417giant_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 432static int 433giant_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 448static int 449giant_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 464static int 465giant_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 480static int 481giant_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 496static int 497giant_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 514static int 515giant_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 532static void 533notify(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 552static void 553notify_create(struct cdev *dev, int flags) 554{ 555 556 notify(dev, "CREATE", flags); 557} 558 559static void 560notify_destroy(struct cdev *dev) 561{ 562 563 notify(dev, "DESTROY", MAKEDEV_WAITOK); 564} 565 566static struct cdev * 567newdev(struct cdevsw *csw, int unit, struct cdev *si) 568{ 569 struct cdev *si2; 570 571 mtx_assert(&devmtx, MA_OWNED); 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) == unit) { 576 dev_free_devlocked(si); 577 return (si2); 578 } 579 } 580 } 581 si->si_drv0 = unit; 582 si->si_devsw = csw; 583 LIST_INSERT_HEAD(&csw->d_devs, si, si_list); 584 return (si); 585} 586 587static void 588fini_cdevsw(struct cdevsw *devsw) 589{ 590 struct cdevsw *gt; 591 592 if (devsw->d_gianttrick != NULL) { 593 gt = devsw->d_gianttrick; 594 memcpy(devsw, gt, sizeof *devsw); 595 cdevsw_free_devlocked(gt); 596 devsw->d_gianttrick = NULL; 597 } 598 devsw->d_flags &= ~D_INIT; 599} 600 601static int 602prep_cdevsw(struct cdevsw *devsw, int flags) 603{ 604 struct cdevsw *dsw2; 605 606 mtx_assert(&devmtx, MA_OWNED); 607 if (devsw->d_flags & D_INIT) 608 return (0); 609 if (devsw->d_flags & D_NEEDGIANT) { 610 dev_unlock(); 611 dsw2 = malloc(sizeof *dsw2, M_DEVT, 612 (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK); 613 dev_lock(); 614 if (dsw2 == NULL && !(devsw->d_flags & D_INIT)) 615 return (ENOMEM); 616 } else 617 dsw2 = NULL; 618 if (devsw->d_flags & D_INIT) { 619 if (dsw2 != NULL) 620 cdevsw_free_devlocked(dsw2); 621 return (0); 622 } 623 624 if (devsw->d_version != D_VERSION_03) { 625 printf( 626 "WARNING: Device driver \"%s\" has wrong version %s\n", 627 devsw->d_name == NULL ? "???" : devsw->d_name, 628 "and is disabled. Recompile KLD module."); 629 devsw->d_open = dead_open; 630 devsw->d_close = dead_close; 631 devsw->d_read = dead_read; 632 devsw->d_write = dead_write; 633 devsw->d_ioctl = dead_ioctl; 634 devsw->d_poll = dead_poll; 635 devsw->d_mmap = dead_mmap; 636 devsw->d_mmap_single = dead_mmap_single; 637 devsw->d_strategy = dead_strategy; 638 devsw->d_dump = dead_dump; 639 devsw->d_kqfilter = dead_kqfilter; 640 } 641 642 if (devsw->d_flags & D_NEEDGIANT) { 643 if (devsw->d_gianttrick == NULL) { 644 memcpy(dsw2, devsw, sizeof *dsw2); 645 devsw->d_gianttrick = dsw2; 646 dsw2 = NULL; 647 } 648 } 649 650#define FIXUP(member, noop, giant) \ 651 do { \ 652 if (devsw->member == NULL) { \ 653 devsw->member = noop; \ 654 } else if (devsw->d_flags & D_NEEDGIANT) \ 655 devsw->member = giant; \ 656 } \ 657 while (0) 658 659 FIXUP(d_open, null_open, giant_open); 660 FIXUP(d_fdopen, NULL, giant_fdopen); 661 FIXUP(d_close, null_close, giant_close); 662 FIXUP(d_read, no_read, giant_read); 663 FIXUP(d_write, no_write, giant_write); 664 FIXUP(d_ioctl, no_ioctl, giant_ioctl); 665 FIXUP(d_poll, no_poll, giant_poll); 666 FIXUP(d_mmap, no_mmap, giant_mmap); 667 FIXUP(d_strategy, no_strategy, giant_strategy); 668 FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter); 669 FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single); 670 671 if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 672 673 LIST_INIT(&devsw->d_devs); 674 675 devsw->d_flags |= D_INIT; 676 677 if (dsw2 != NULL) 678 cdevsw_free_devlocked(dsw2); 679 return (0); 680} 681 682static int 683prep_devname(struct cdev *dev, const char *fmt, va_list ap) 684{ 685 int len; 686 char *from, *q, *s, *to; 687 688 mtx_assert(&devmtx, MA_OWNED); 689 690 len = vsnrprintf(dev->si_name, sizeof(dev->si_name), 32, fmt, ap); 691 if (len > sizeof(dev->si_name) - 1) 692 return (ENAMETOOLONG); 693 694 /* Strip leading slashes. */ 695 for (from = dev->si_name; *from == '/'; from++) 696 ; 697 698 for (to = dev->si_name; *from != '\0'; from++, to++) { 699 /* 700 * Spaces and double quotation marks cause 701 * problems for the devctl(4) protocol. 702 * Reject names containing those characters. 703 */ 704 if (isspace(*from) || *from == '"') 705 return (EINVAL); 706 /* Treat multiple sequential slashes as single. */ 707 while (from[0] == '/' && from[1] == '/') 708 from++; 709 /* Trailing slash is considered invalid. */ 710 if (from[0] == '/' && from[1] == '\0') 711 return (EINVAL); 712 *to = *from; 713 } 714 *to = '\0'; 715 716 if (dev->si_name[0] == '\0') 717 return (EINVAL); 718 719 /* Disallow "." and ".." components. */ 720 for (s = dev->si_name;;) { 721 for (q = s; *q != '/' && *q != '\0'; q++) 722 ; 723 if (q - s == 1 && s[0] == '.') 724 return (EINVAL); 725 if (q - s == 2 && s[0] == '.' && s[1] == '.') 726 return (EINVAL); 727 if (*q != '/') 728 break; 729 s = q + 1; 730 } 731 732 if (devfs_dev_exists(dev->si_name) != 0) 733 return (EEXIST); 734 735 return (0); 736} 737 738static int 739make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit, 740 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 741 va_list ap) 742{ 743 struct cdev *dev, *dev_new; 744 int res; 745 746 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, 747 ("make_dev_credv: both WAITOK and NOWAIT specified")); 748 dev_new = devfs_alloc(flags); 749 if (dev_new == NULL) 750 return (ENOMEM); 751 dev_lock(); 752 res = prep_cdevsw(devsw, flags); 753 if (res != 0) { 754 dev_unlock(); 755 devfs_free(dev_new); 756 return (res); 757 } 758 dev = newdev(devsw, unit, dev_new); 759 if ((dev->si_flags & SI_NAMED) == 0) { 760 res = prep_devname(dev, fmt, ap); 761 if (res != 0) { 762 if ((flags & MAKEDEV_CHECKNAME) == 0) { 763 panic( 764 "make_dev_credv: bad si_name (error=%d, si_name=%s)", 765 res, dev->si_name); 766 } 767 if (dev == dev_new) { 768 LIST_REMOVE(dev, si_list); 769 dev_unlock(); 770 devfs_free(dev); 771 } else 772 dev_unlock(); 773 return (res); 774 } 775 } 776 if (flags & MAKEDEV_REF) 777 dev_refl(dev); 778 if (flags & MAKEDEV_ETERNAL) 779 dev->si_flags |= SI_ETERNAL; 780 if (dev->si_flags & SI_CHEAPCLONE && 781 dev->si_flags & SI_NAMED) { 782 /* 783 * This is allowed as it removes races and generally 784 * simplifies cloning devices. 785 * XXX: still ?? 786 */ 787 dev_unlock_and_free(); 788 *dres = dev; 789 return (0); 790 } 791 KASSERT(!(dev->si_flags & SI_NAMED), 792 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", 793 devsw->d_name, dev2unit(dev), devtoname(dev))); 794 dev->si_flags |= SI_NAMED; 795 if (cr != NULL) 796 dev->si_cred = crhold(cr); 797 dev->si_uid = uid; 798 dev->si_gid = gid; 799 dev->si_mode = mode; 800 801 devfs_create(dev); 802 clean_unrhdrl(devfs_inos); 803 dev_unlock_and_free(); 804 805 notify_create(dev, flags); 806 807 *dres = dev; 808 return (0); 809} 810 811struct cdev * 812make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode, 813 const char *fmt, ...) 814{ 815 struct cdev *dev; 816 va_list ap; 817 int res; 818 819 va_start(ap, fmt); 820 res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt, 821 ap); 822 va_end(ap); 823 KASSERT(res == 0 && dev != NULL, 824 ("make_dev: failed make_dev_credv (error=%d)", res)); 825 return (dev); 826} 827 828struct cdev * 829make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid, 830 gid_t gid, int mode, const char *fmt, ...) 831{ 832 struct cdev *dev; 833 va_list ap; 834 int res; 835 836 va_start(ap, fmt); 837 res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap); 838 va_end(ap); 839 840 KASSERT(res == 0 && dev != NULL, 841 ("make_dev_cred: failed make_dev_credv (error=%d)", res)); 842 return (dev); 843} 844 845struct cdev * 846make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr, 847 uid_t uid, gid_t gid, int mode, const char *fmt, ...) 848{ 849 struct cdev *dev; 850 va_list ap; 851 int res; 852 853 va_start(ap, fmt); 854 res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode, 855 fmt, ap); 856 va_end(ap); 857 858 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 859 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 860 ("make_dev_credf: failed make_dev_credv (error=%d)", res)); 861 return (res == 0 ? dev : NULL); 862} 863 864int 865make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw, 866 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...) 867{ 868 va_list ap; 869 int res; 870 871 va_start(ap, fmt); 872 res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode, 873 fmt, ap); 874 va_end(ap); 875 876 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 877 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 878 ("make_dev_p: failed make_dev_credv (error=%d)", res)); 879 return (res); 880} 881 882static void 883dev_dependsl(struct cdev *pdev, struct cdev *cdev) 884{ 885 886 cdev->si_parent = pdev; 887 cdev->si_flags |= SI_CHILD; 888 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 889} 890 891 892void 893dev_depends(struct cdev *pdev, struct cdev *cdev) 894{ 895 896 dev_lock(); 897 dev_dependsl(pdev, cdev); 898 dev_unlock(); 899} 900 901static int 902make_dev_alias_v(int flags, struct cdev **cdev, struct cdev *pdev, 903 const char *fmt, va_list ap) 904{ 905 struct cdev *dev; 906 int error; 907 908 KASSERT(pdev != NULL, ("make_dev_alias_v: pdev is NULL")); 909 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, 910 ("make_dev_alias_v: both WAITOK and NOWAIT specified")); 911 KASSERT((flags & ~(MAKEDEV_WAITOK | MAKEDEV_NOWAIT | 912 MAKEDEV_CHECKNAME)) == 0, 913 ("make_dev_alias_v: invalid flags specified (flags=%02x)", flags)); 914 915 dev = devfs_alloc(flags); 916 if (dev == NULL) 917 return (ENOMEM); 918 dev_lock(); 919 dev->si_flags |= SI_ALIAS; 920 error = prep_devname(dev, fmt, ap); 921 if (error != 0) { 922 if ((flags & MAKEDEV_CHECKNAME) == 0) { 923 panic("make_dev_alias_v: bad si_name " 924 "(error=%d, si_name=%s)", error, dev->si_name); 925 } 926 dev_unlock(); 927 devfs_free(dev); 928 return (error); 929 } 930 dev->si_flags |= SI_NAMED; 931 devfs_create(dev); 932 dev_dependsl(pdev, dev); 933 clean_unrhdrl(devfs_inos); 934 dev_unlock(); 935 936 notify_create(dev, flags); 937 *cdev = dev; 938 939 return (0); 940} 941 942struct cdev * 943make_dev_alias(struct cdev *pdev, const char *fmt, ...) 944{ 945 struct cdev *dev; 946 va_list ap; 947 int res; 948 949 va_start(ap, fmt); 950 res = make_dev_alias_v(MAKEDEV_WAITOK, &dev, pdev, fmt, ap); 951 va_end(ap); 952 953 KASSERT(res == 0 && dev != NULL, 954 ("make_dev_alias: failed make_dev_alias_v (error=%d)", res)); 955 return (dev); 956} 957 958int 959make_dev_alias_p(int flags, struct cdev **cdev, struct cdev *pdev, 960 const char *fmt, ...) 961{ 962 va_list ap; 963 int res; 964 965 va_start(ap, fmt); 966 res = make_dev_alias_v(flags, cdev, pdev, fmt, ap); 967 va_end(ap); 968 return (res); 969} 970 971int 972make_dev_physpath_alias(int flags, struct cdev **cdev, struct cdev *pdev, 973 struct cdev *old_alias, const char *physpath) 974{ 975 char *devfspath; 976 int physpath_len; 977 int max_parentpath_len; 978 int parentpath_len; 979 int devfspathbuf_len; 980 int mflags; 981 int ret; 982 983 *cdev = NULL; 984 devfspath = NULL; 985 physpath_len = strlen(physpath); 986 ret = EINVAL; 987 if (physpath_len == 0) 988 goto out; 989 990 if (strncmp("id1,", physpath, 4) == 0) { 991 physpath += 4; 992 physpath_len -= 4; 993 if (physpath_len == 0) 994 goto out; 995 } 996 997 max_parentpath_len = SPECNAMELEN - physpath_len - /*/*/1; 998 parentpath_len = strlen(pdev->si_name); 999 if (max_parentpath_len < parentpath_len) { 1000 if (bootverbose) 1001 printf("WARNING: Unable to alias %s " 1002 "to %s/%s - path too long\n", 1003 pdev->si_name, physpath, pdev->si_name); 1004 ret = ENAMETOOLONG; 1005 goto out; 1006 } 1007 1008 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; 1009 devfspathbuf_len = physpath_len + /*/*/1 + parentpath_len + /*NUL*/1; 1010 devfspath = malloc(devfspathbuf_len, M_DEVBUF, mflags); 1011 if (devfspath == NULL) { 1012 ret = ENOMEM; 1013 goto out; 1014 } 1015 1016 sprintf(devfspath, "%s/%s", physpath, pdev->si_name); 1017 if (old_alias != NULL && strcmp(old_alias->si_name, devfspath) == 0) { 1018 /* Retain the existing alias. */ 1019 *cdev = old_alias; 1020 old_alias = NULL; 1021 ret = 0; 1022 } else { 1023 ret = make_dev_alias_p(flags, cdev, pdev, "%s", devfspath); 1024 } 1025out: 1026 if (old_alias != NULL) 1027 destroy_dev(old_alias); 1028 if (devfspath != NULL) 1029 free(devfspath, M_DEVBUF); 1030 return (ret); 1031} 1032 1033static void 1034destroy_devl(struct cdev *dev) 1035{ 1036 struct cdevsw *csw; 1037 struct cdev_privdata *p; 1038 1039 mtx_assert(&devmtx, MA_OWNED); 1040 KASSERT(dev->si_flags & SI_NAMED, 1041 ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev))); 1042 KASSERT((dev->si_flags & SI_ETERNAL) == 0, 1043 ("WARNING: Driver mistake: destroy_dev on eternal %d\n", 1044 dev2unit(dev))); 1045 1046 devfs_destroy(dev); 1047 1048 /* Remove name marking */ 1049 dev->si_flags &= ~SI_NAMED; 1050 1051 dev->si_refcount++; /* Avoid race with dev_rel() */ 1052 1053 /* If we are a child, remove us from the parents list */ 1054 if (dev->si_flags & SI_CHILD) { 1055 LIST_REMOVE(dev, si_siblings); 1056 dev->si_flags &= ~SI_CHILD; 1057 } 1058 1059 /* Kill our children */ 1060 while (!LIST_EMPTY(&dev->si_children)) 1061 destroy_devl(LIST_FIRST(&dev->si_children)); 1062 1063 /* Remove from clone list */ 1064 if (dev->si_flags & SI_CLONELIST) { 1065 LIST_REMOVE(dev, si_clone); 1066 dev->si_flags &= ~SI_CLONELIST; 1067 } 1068 1069 csw = dev->si_devsw; 1070 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 1071 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 1072 csw->d_purge(dev); 1073 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 1074 if (dev->si_threadcount) 1075 printf("Still %lu threads in %s\n", 1076 dev->si_threadcount, devtoname(dev)); 1077 } 1078 while (dev->si_threadcount != 0) { 1079 /* Use unique dummy wait ident */ 1080 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10); 1081 } 1082 1083 dev_unlock(); 1084 notify_destroy(dev); 1085 mtx_lock(&cdevpriv_mtx); 1086 while ((p = LIST_FIRST(&cdev2priv(dev)->cdp_fdpriv)) != NULL) { 1087 devfs_destroy_cdevpriv(p); 1088 mtx_lock(&cdevpriv_mtx); 1089 } 1090 mtx_unlock(&cdevpriv_mtx); 1091 dev_lock(); 1092 1093 dev->si_drv1 = 0; 1094 dev->si_drv2 = 0; 1095 bzero(&dev->__si_u, sizeof(dev->__si_u)); 1096 1097 if (!(dev->si_flags & SI_ALIAS)) { 1098 /* Remove from cdevsw list */ 1099 LIST_REMOVE(dev, si_list); 1100 1101 /* If cdevsw has no more struct cdev *'s, clean it */ 1102 if (LIST_EMPTY(&csw->d_devs)) { 1103 fini_cdevsw(csw); 1104 wakeup(&csw->d_devs); 1105 } 1106 } 1107 dev->si_flags &= ~SI_ALIAS; 1108 dev->si_refcount--; /* Avoid race with dev_rel() */ 1109 1110 if (dev->si_refcount > 0) { 1111 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 1112 } else { 1113 dev_free_devlocked(dev); 1114 } 1115} 1116 1117void 1118destroy_dev(struct cdev *dev) 1119{ 1120 1121 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev"); 1122 dev_lock(); 1123 destroy_devl(dev); 1124 dev_unlock_and_free(); 1125} 1126 1127const char * 1128devtoname(struct cdev *dev) 1129{ 1130 1131 return (dev->si_name); 1132} 1133 1134int 1135dev_stdclone(char *name, char **namep, const char *stem, int *unit) 1136{ 1137 int u, i; 1138 1139 i = strlen(stem); 1140 if (bcmp(stem, name, i) != 0) 1141 return (0); 1142 if (!isdigit(name[i])) 1143 return (0); 1144 u = 0; 1145 if (name[i] == '0' && isdigit(name[i+1])) 1146 return (0); 1147 while (isdigit(name[i])) { 1148 u *= 10; 1149 u += name[i++] - '0'; 1150 } 1151 if (u > 0xffffff) 1152 return (0); 1153 *unit = u; 1154 if (namep) 1155 *namep = &name[i]; 1156 if (name[i]) 1157 return (2); 1158 return (1); 1159} 1160 1161/* 1162 * Helper functions for cloning device drivers. 1163 * 1164 * The objective here is to make it unnecessary for the device drivers to 1165 * use rman or similar to manage their unit number space. Due to the way 1166 * we do "on-demand" devices, using rman or other "private" methods 1167 * will be very tricky to lock down properly once we lock down this file. 1168 * 1169 * Instead we give the drivers these routines which puts the struct cdev *'s 1170 * that are to be managed on their own list, and gives the driver the ability 1171 * to ask for the first free unit number or a given specified unit number. 1172 * 1173 * In addition these routines support paired devices (pty, nmdm and similar) 1174 * by respecting a number of "flag" bits in the minor number. 1175 * 1176 */ 1177 1178struct clonedevs { 1179 LIST_HEAD(,cdev) head; 1180}; 1181 1182void 1183clone_setup(struct clonedevs **cdp) 1184{ 1185 1186 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 1187 LIST_INIT(&(*cdp)->head); 1188} 1189 1190int 1191clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, 1192 struct cdev **dp, int extra) 1193{ 1194 struct clonedevs *cd; 1195 struct cdev *dev, *ndev, *dl, *de; 1196 int unit, low, u; 1197 1198 KASSERT(*cdp != NULL, 1199 ("clone_setup() not called in driver \"%s\"", csw->d_name)); 1200 KASSERT(!(extra & CLONE_UNITMASK), 1201 ("Illegal extra bits (0x%x) in clone_create", extra)); 1202 KASSERT(*up <= CLONE_UNITMASK, 1203 ("Too high unit (0x%x) in clone_create", *up)); 1204 KASSERT(csw->d_flags & D_NEEDMINOR, 1205 ("clone_create() on cdevsw without minor numbers")); 1206 1207 1208 /* 1209 * Search the list for a lot of things in one go: 1210 * A preexisting match is returned immediately. 1211 * The lowest free unit number if we are passed -1, and the place 1212 * in the list where we should insert that new element. 1213 * The place to insert a specified unit number, if applicable 1214 * the end of the list. 1215 */ 1216 unit = *up; 1217 ndev = devfs_alloc(MAKEDEV_WAITOK); 1218 dev_lock(); 1219 prep_cdevsw(csw, MAKEDEV_WAITOK); 1220 low = extra; 1221 de = dl = NULL; 1222 cd = *cdp; 1223 LIST_FOREACH(dev, &cd->head, si_clone) { 1224 KASSERT(dev->si_flags & SI_CLONELIST, 1225 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1226 u = dev2unit(dev); 1227 if (u == (unit | extra)) { 1228 *dp = dev; 1229 dev_unlock(); 1230 devfs_free(ndev); 1231 return (0); 1232 } 1233 if (unit == -1 && u == low) { 1234 low++; 1235 de = dev; 1236 continue; 1237 } else if (u < (unit | extra)) { 1238 de = dev; 1239 continue; 1240 } else if (u > (unit | extra)) { 1241 dl = dev; 1242 break; 1243 } 1244 } 1245 if (unit == -1) 1246 unit = low & CLONE_UNITMASK; 1247 dev = newdev(csw, unit | extra, ndev); 1248 if (dev->si_flags & SI_CLONELIST) { 1249 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 1250 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra); 1251 LIST_FOREACH(dev, &cd->head, si_clone) { 1252 printf("\t%p %s\n", dev, dev->si_name); 1253 } 1254 panic("foo"); 1255 } 1256 KASSERT(!(dev->si_flags & SI_CLONELIST), 1257 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 1258 if (dl != NULL) 1259 LIST_INSERT_BEFORE(dl, dev, si_clone); 1260 else if (de != NULL) 1261 LIST_INSERT_AFTER(de, dev, si_clone); 1262 else 1263 LIST_INSERT_HEAD(&cd->head, dev, si_clone); 1264 dev->si_flags |= SI_CLONELIST; 1265 *up = unit; 1266 dev_unlock_and_free(); 1267 return (1); 1268} 1269 1270/* 1271 * Kill everything still on the list. The driver should already have 1272 * disposed of any softc hung of the struct cdev *'s at this time. 1273 */ 1274void 1275clone_cleanup(struct clonedevs **cdp) 1276{ 1277 struct cdev *dev; 1278 struct cdev_priv *cp; 1279 struct clonedevs *cd; 1280 1281 cd = *cdp; 1282 if (cd == NULL) 1283 return; 1284 dev_lock(); 1285 while (!LIST_EMPTY(&cd->head)) { 1286 dev = LIST_FIRST(&cd->head); 1287 LIST_REMOVE(dev, si_clone); 1288 KASSERT(dev->si_flags & SI_CLONELIST, 1289 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1290 dev->si_flags &= ~SI_CLONELIST; 1291 cp = cdev2priv(dev); 1292 if (!(cp->cdp_flags & CDP_SCHED_DTR)) { 1293 cp->cdp_flags |= CDP_SCHED_DTR; 1294 KASSERT(dev->si_flags & SI_NAMED, 1295 ("Driver has goofed in cloning underways udev %x unit %x", dev2udev(dev), dev2unit(dev))); 1296 destroy_devl(dev); 1297 } 1298 } 1299 dev_unlock_and_free(); 1300 free(cd, M_DEVBUF); 1301 *cdp = NULL; 1302} 1303 1304static TAILQ_HEAD(, cdev_priv) dev_ddtr = 1305 TAILQ_HEAD_INITIALIZER(dev_ddtr); 1306static struct task dev_dtr_task = TASK_INITIALIZER(0, destroy_dev_tq, NULL); 1307 1308static void 1309destroy_dev_tq(void *ctx, int pending) 1310{ 1311 struct cdev_priv *cp; 1312 struct cdev *dev; 1313 void (*cb)(void *); 1314 void *cb_arg; 1315 1316 dev_lock(); 1317 while (!TAILQ_EMPTY(&dev_ddtr)) { 1318 cp = TAILQ_FIRST(&dev_ddtr); 1319 dev = &cp->cdp_c; 1320 KASSERT(cp->cdp_flags & CDP_SCHED_DTR, 1321 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp)); 1322 TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list); 1323 cb = cp->cdp_dtr_cb; 1324 cb_arg = cp->cdp_dtr_cb_arg; 1325 destroy_devl(dev); 1326 dev_unlock_and_free(); 1327 dev_rel(dev); 1328 if (cb != NULL) 1329 cb(cb_arg); 1330 dev_lock(); 1331 } 1332 dev_unlock(); 1333} 1334 1335/* 1336 * devmtx shall be locked on entry. devmtx will be unlocked after 1337 * function return. 1338 */ 1339static int 1340destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg) 1341{ 1342 struct cdev_priv *cp; 1343 1344 mtx_assert(&devmtx, MA_OWNED); 1345 cp = cdev2priv(dev); 1346 if (cp->cdp_flags & CDP_SCHED_DTR) { 1347 dev_unlock(); 1348 return (0); 1349 } 1350 dev_refl(dev); 1351 cp->cdp_flags |= CDP_SCHED_DTR; 1352 cp->cdp_dtr_cb = cb; 1353 cp->cdp_dtr_cb_arg = arg; 1354 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list); 1355 dev_unlock(); 1356 taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task); 1357 return (1); 1358} 1359 1360int 1361destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg) 1362{ 1363 1364 dev_lock(); 1365 return (destroy_dev_sched_cbl(dev, cb, arg)); 1366} 1367 1368int 1369destroy_dev_sched(struct cdev *dev) 1370{ 1371 1372 return (destroy_dev_sched_cb(dev, NULL, NULL)); 1373} 1374 1375void 1376destroy_dev_drain(struct cdevsw *csw) 1377{ 1378 1379 dev_lock(); 1380 while (!LIST_EMPTY(&csw->d_devs)) { 1381 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10); 1382 } 1383 dev_unlock(); 1384} 1385 1386void 1387drain_dev_clone_events(void) 1388{ 1389 1390 sx_xlock(&clone_drain_lock); 1391 sx_xunlock(&clone_drain_lock); 1392} 1393 1394#include "opt_ddb.h" 1395#ifdef DDB 1396#include <sys/kernel.h> 1397 1398#include <ddb/ddb.h> 1399 1400DB_SHOW_COMMAND(cdev, db_show_cdev) 1401{ 1402 struct cdev_priv *cdp; 1403 struct cdev *dev; 1404 u_int flags; 1405 char buf[512]; 1406 1407 if (!have_addr) { 1408 TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { 1409 dev = &cdp->cdp_c; 1410 db_printf("%s %p\n", dev->si_name, dev); 1411 if (db_pager_quit) 1412 break; 1413 } 1414 return; 1415 } 1416 1417 dev = (struct cdev *)addr; 1418 cdp = cdev2priv(dev); 1419 db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n", 1420 dev->si_name, dev->si_refcount, dev->si_usecount, 1421 dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first); 1422 db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n", 1423 dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2); 1424 flags = dev->si_flags; 1425#define SI_FLAG(flag) do { \ 1426 if (flags & (flag)) { \ 1427 if (buf[0] != '\0') \ 1428 strlcat(buf, ", ", sizeof(buf)); \ 1429 strlcat(buf, (#flag) + 3, sizeof(buf)); \ 1430 flags &= ~(flag); \ 1431 } \ 1432} while (0) 1433 buf[0] = '\0'; 1434 SI_FLAG(SI_ETERNAL); 1435 SI_FLAG(SI_ALIAS); 1436 SI_FLAG(SI_NAMED); 1437 SI_FLAG(SI_CHEAPCLONE); 1438 SI_FLAG(SI_CHILD); 1439 SI_FLAG(SI_DUMPDEV); 1440 SI_FLAG(SI_CLONELIST); 1441 db_printf("si_flags %s\n", buf); 1442 1443 flags = cdp->cdp_flags; 1444#define CDP_FLAG(flag) do { \ 1445 if (flags & (flag)) { \ 1446 if (buf[0] != '\0') \ 1447 strlcat(buf, ", ", sizeof(buf)); \ 1448 strlcat(buf, (#flag) + 4, sizeof(buf)); \ 1449 flags &= ~(flag); \ 1450 } \ 1451} while (0) 1452 buf[0] = '\0'; 1453 CDP_FLAG(CDP_ACTIVE); 1454 CDP_FLAG(CDP_SCHED_DTR); 1455 db_printf("cdp_flags %s\n", buf); 1456} 1457#endif 1458