kern_conf.c revision 231379
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 231379 2012-02-10 12:40:50Z ed $"); 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 dev->si_threadcount++; 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 dev->si_threadcount++; 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 dev_lock(); 255 KASSERT(dev->si_threadcount > 0, 256 ("%s threadcount is wrong", dev->si_name)); 257 dev->si_threadcount--; 258 dev_unlock(); 259} 260 261int 262nullop(void) 263{ 264 265 return (0); 266} 267 268int 269eopnotsupp(void) 270{ 271 272 return (EOPNOTSUPP); 273} 274 275static int 276enxio(void) 277{ 278 return (ENXIO); 279} 280 281static int 282enodev(void) 283{ 284 return (ENODEV); 285} 286 287/* Define a dead_cdevsw for use when devices leave unexpectedly. */ 288 289#define dead_open (d_open_t *)enxio 290#define dead_close (d_close_t *)enxio 291#define dead_read (d_read_t *)enxio 292#define dead_write (d_write_t *)enxio 293#define dead_ioctl (d_ioctl_t *)enxio 294#define dead_poll (d_poll_t *)enodev 295#define dead_mmap (d_mmap_t *)enodev 296 297static void 298dead_strategy(struct bio *bp) 299{ 300 301 biofinish(bp, NULL, ENXIO); 302} 303 304#define dead_dump (dumper_t *)enxio 305#define dead_kqfilter (d_kqfilter_t *)enxio 306#define dead_mmap_single (d_mmap_single_t *)enodev 307 308static struct cdevsw dead_cdevsw = { 309 .d_version = D_VERSION, 310 .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */ 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_mmap_t *)enodev 333#define no_kqfilter (d_kqfilter_t *)enodev 334#define no_mmap_single (d_mmap_single_t *)enodev 335 336static void 337no_strategy(struct bio *bp) 338{ 339 340 biofinish(bp, NULL, ENODEV); 341} 342 343static int 344no_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 352static int 353giant_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 368static int 369giant_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 384static int 385giant_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 400static void 401giant_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 419static int 420giant_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 435static int 436giant_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 451static int 452giant_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 467static int 468giant_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 483static int 484giant_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 499static int 500giant_mmap(struct cdev *dev, vm_ooffset_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 retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot, 511 memattr); 512 mtx_unlock(&Giant); 513 dev_relthread(dev, ref); 514 return (retval); 515} 516 517static int 518giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size, 519 vm_object_t *object, int nprot) 520{ 521 struct cdevsw *dsw; 522 int ref, retval; 523 524 dsw = dev_refthread(dev, &ref); 525 if (dsw == NULL) 526 return (ENXIO); 527 mtx_lock(&Giant); 528 retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object, 529 nprot); 530 mtx_unlock(&Giant); 531 dev_relthread(dev, ref); 532 return (retval); 533} 534 535static void 536notify(struct cdev *dev, const char *ev, int flags) 537{ 538 static const char prefix[] = "cdev="; 539 char *data; 540 int namelen, mflags; 541 542 if (cold) 543 return; 544 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; 545 namelen = strlen(dev->si_name); 546 data = malloc(namelen + sizeof(prefix), M_TEMP, mflags); 547 if (data == NULL) 548 return; 549 memcpy(data, prefix, sizeof(prefix) - 1); 550 memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1); 551 devctl_notify_f("DEVFS", "CDEV", ev, data, mflags); 552 free(data, M_TEMP); 553} 554 555static void 556notify_create(struct cdev *dev, int flags) 557{ 558 559 notify(dev, "CREATE", flags); 560} 561 562static void 563notify_destroy(struct cdev *dev) 564{ 565 566 notify(dev, "DESTROY", MAKEDEV_WAITOK); 567} 568 569static struct cdev * 570newdev(struct cdevsw *csw, int unit, struct cdev *si) 571{ 572 struct cdev *si2; 573 574 mtx_assert(&devmtx, MA_OWNED); 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) == unit) { 579 dev_free_devlocked(si); 580 return (si2); 581 } 582 } 583 } 584 si->si_drv0 = unit; 585 si->si_devsw = csw; 586 LIST_INSERT_HEAD(&csw->d_devs, si, si_list); 587 return (si); 588} 589 590static void 591fini_cdevsw(struct cdevsw *devsw) 592{ 593 struct cdevsw *gt; 594 595 if (devsw->d_gianttrick != NULL) { 596 gt = devsw->d_gianttrick; 597 memcpy(devsw, gt, sizeof *devsw); 598 cdevsw_free_devlocked(gt); 599 devsw->d_gianttrick = NULL; 600 } 601 devsw->d_flags &= ~D_INIT; 602} 603 604static int 605prep_cdevsw(struct cdevsw *devsw, int flags) 606{ 607 struct cdevsw *dsw2; 608 609 mtx_assert(&devmtx, MA_OWNED); 610 if (devsw->d_flags & D_INIT) 611 return (0); 612 if (devsw->d_flags & D_NEEDGIANT) { 613 dev_unlock(); 614 dsw2 = malloc(sizeof *dsw2, M_DEVT, 615 (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK); 616 dev_lock(); 617 if (dsw2 == NULL && !(devsw->d_flags & D_INIT)) 618 return (ENOMEM); 619 } else 620 dsw2 = NULL; 621 if (devsw->d_flags & D_INIT) { 622 if (dsw2 != NULL) 623 cdevsw_free_devlocked(dsw2); 624 return (0); 625 } 626 627 if (devsw->d_version != D_VERSION_03) { 628 printf( 629 "WARNING: Device driver \"%s\" has wrong version %s\n", 630 devsw->d_name == NULL ? "???" : devsw->d_name, 631 "and is disabled. Recompile KLD module."); 632 devsw->d_open = dead_open; 633 devsw->d_close = dead_close; 634 devsw->d_read = dead_read; 635 devsw->d_write = dead_write; 636 devsw->d_ioctl = dead_ioctl; 637 devsw->d_poll = dead_poll; 638 devsw->d_mmap = dead_mmap; 639 devsw->d_mmap_single = dead_mmap_single; 640 devsw->d_strategy = dead_strategy; 641 devsw->d_dump = dead_dump; 642 devsw->d_kqfilter = dead_kqfilter; 643 } 644 645 if (devsw->d_flags & D_NEEDGIANT) { 646 if (devsw->d_gianttrick == NULL) { 647 memcpy(dsw2, devsw, sizeof *dsw2); 648 devsw->d_gianttrick = dsw2; 649 dsw2 = NULL; 650 } 651 } 652 653#define FIXUP(member, noop, giant) \ 654 do { \ 655 if (devsw->member == NULL) { \ 656 devsw->member = noop; \ 657 } else if (devsw->d_flags & D_NEEDGIANT) \ 658 devsw->member = giant; \ 659 } \ 660 while (0) 661 662 FIXUP(d_open, null_open, giant_open); 663 FIXUP(d_fdopen, NULL, giant_fdopen); 664 FIXUP(d_close, null_close, giant_close); 665 FIXUP(d_read, no_read, giant_read); 666 FIXUP(d_write, no_write, giant_write); 667 FIXUP(d_ioctl, no_ioctl, giant_ioctl); 668 FIXUP(d_poll, no_poll, giant_poll); 669 FIXUP(d_mmap, no_mmap, giant_mmap); 670 FIXUP(d_strategy, no_strategy, giant_strategy); 671 FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter); 672 FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single); 673 674 if (devsw->d_dump == NULL) devsw->d_dump = no_dump; 675 676 LIST_INIT(&devsw->d_devs); 677 678 devsw->d_flags |= D_INIT; 679 680 if (dsw2 != NULL) 681 cdevsw_free_devlocked(dsw2); 682 return (0); 683} 684 685static int 686prep_devname(struct cdev *dev, const char *fmt, va_list ap) 687{ 688 int len; 689 char *from, *q, *s, *to; 690 691 mtx_assert(&devmtx, MA_OWNED); 692 693 len = vsnrprintf(dev->si_name, sizeof(dev->si_name), 32, 694 fmt, ap); 695 if (len > sizeof(dev->si_name) - 1) 696 return (ENAMETOOLONG); 697 698 /* Strip leading slashes. */ 699 for (from = dev->si_name; *from == '/'; from++) 700 ; 701 702 for (to = dev->si_name; *from != '\0'; from++, to++) { 703 /* Treat multiple sequential slashes as single. */ 704 while (from[0] == '/' && from[1] == '/') 705 from++; 706 /* Trailing slash is considered invalid. */ 707 if (from[0] == '/' && from[1] == '\0') 708 return (EINVAL); 709 *to = *from; 710 } 711 *to = '\0'; 712 713 if (dev->si_name[0] == '\0') 714 return (EINVAL); 715 716 /* Disallow "." and ".." components. */ 717 for (s = dev->si_name;;) { 718 for (q = s; *q != '/' && *q != '\0'; q++) 719 ; 720 if (q - s == 1 && s[0] == '.') 721 return (EINVAL); 722 if (q - s == 2 && s[0] == '.' && s[1] == '.') 723 return (EINVAL); 724 if (*q != '/') 725 break; 726 s = q + 1; 727 } 728 729 if (devfs_dev_exists(dev->si_name) != 0) 730 return (EEXIST); 731 732 return (0); 733} 734 735static int 736make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit, 737 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, 738 va_list ap) 739{ 740 struct cdev *dev, *dev_new; 741 int res; 742 743 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, 744 ("make_dev_credv: both WAITOK and NOWAIT specified")); 745 dev_new = devfs_alloc(flags); 746 if (dev_new == NULL) 747 return (ENOMEM); 748 dev_lock(); 749 res = prep_cdevsw(devsw, flags); 750 if (res != 0) { 751 dev_unlock(); 752 devfs_free(dev_new); 753 return (res); 754 } 755 dev = newdev(devsw, unit, dev_new); 756 if ((dev->si_flags & SI_NAMED) == 0) { 757 res = prep_devname(dev, fmt, ap); 758 if (res != 0) { 759 if ((flags & MAKEDEV_CHECKNAME) == 0) { 760 panic( 761 "make_dev_credv: bad si_name (error=%d, si_name=%s)", 762 res, dev->si_name); 763 } 764 if (dev == dev_new) { 765 LIST_REMOVE(dev, si_list); 766 dev_unlock(); 767 devfs_free(dev); 768 } else 769 dev_unlock(); 770 return (res); 771 } 772 } 773 if (flags & MAKEDEV_REF) 774 dev_refl(dev); 775 if (flags & MAKEDEV_ETERNAL) 776 dev->si_flags |= SI_ETERNAL; 777 if (dev->si_flags & SI_CHEAPCLONE && 778 dev->si_flags & SI_NAMED) { 779 /* 780 * This is allowed as it removes races and generally 781 * simplifies cloning devices. 782 * XXX: still ?? 783 */ 784 dev_unlock_and_free(); 785 *dres = dev; 786 return (0); 787 } 788 KASSERT(!(dev->si_flags & SI_NAMED), 789 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)", 790 devsw->d_name, dev2unit(dev), devtoname(dev))); 791 dev->si_flags |= SI_NAMED; 792 if (cr != NULL) 793 dev->si_cred = crhold(cr); 794 dev->si_uid = uid; 795 dev->si_gid = gid; 796 dev->si_mode = mode; 797 798 devfs_create(dev); 799 clean_unrhdrl(devfs_inos); 800 dev_unlock_and_free(); 801 802 notify_create(dev, flags); 803 804 *dres = dev; 805 return (0); 806} 807 808struct cdev * 809make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode, 810 const char *fmt, ...) 811{ 812 struct cdev *dev; 813 va_list ap; 814 int res; 815 816 va_start(ap, fmt); 817 res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt, 818 ap); 819 va_end(ap); 820 KASSERT(res == 0 && dev != NULL, 821 ("make_dev: failed make_dev_credv (error=%d)", res)); 822 return (dev); 823} 824 825struct cdev * 826make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid, 827 gid_t gid, int mode, const char *fmt, ...) 828{ 829 struct cdev *dev; 830 va_list ap; 831 int res; 832 833 va_start(ap, fmt); 834 res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap); 835 va_end(ap); 836 837 KASSERT(res == 0 && dev != NULL, 838 ("make_dev_cred: failed make_dev_credv (error=%d)", res)); 839 return (dev); 840} 841 842struct cdev * 843make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr, 844 uid_t uid, gid_t gid, int mode, const char *fmt, ...) 845{ 846 struct cdev *dev; 847 va_list ap; 848 int res; 849 850 va_start(ap, fmt); 851 res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode, 852 fmt, ap); 853 va_end(ap); 854 855 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 856 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 857 ("make_dev_credf: failed make_dev_credv (error=%d)", res)); 858 return (res == 0 ? dev : NULL); 859} 860 861int 862make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw, 863 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...) 864{ 865 va_list ap; 866 int res; 867 868 va_start(ap, fmt); 869 res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode, 870 fmt, ap); 871 va_end(ap); 872 873 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) || 874 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0, 875 ("make_dev_p: failed make_dev_credv (error=%d)", res)); 876 return (res); 877} 878 879static void 880dev_dependsl(struct cdev *pdev, struct cdev *cdev) 881{ 882 883 cdev->si_parent = pdev; 884 cdev->si_flags |= SI_CHILD; 885 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings); 886} 887 888 889void 890dev_depends(struct cdev *pdev, struct cdev *cdev) 891{ 892 893 dev_lock(); 894 dev_dependsl(pdev, cdev); 895 dev_unlock(); 896} 897 898static int 899make_dev_alias_v(int flags, struct cdev **cdev, struct cdev *pdev, 900 const char *fmt, va_list ap) 901{ 902 struct cdev *dev; 903 int error; 904 905 KASSERT(pdev != NULL, ("make_dev_alias_v: pdev is NULL")); 906 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0, 907 ("make_dev_alias_v: both WAITOK and NOWAIT specified")); 908 KASSERT((flags & ~(MAKEDEV_WAITOK | MAKEDEV_NOWAIT | 909 MAKEDEV_CHECKNAME)) == 0, 910 ("make_dev_alias_v: invalid flags specified (flags=%02x)", flags)); 911 912 dev = devfs_alloc(flags); 913 if (dev == NULL) 914 return (ENOMEM); 915 dev_lock(); 916 dev->si_flags |= SI_ALIAS; 917 error = prep_devname(dev, fmt, ap); 918 if (error != 0) { 919 if ((flags & MAKEDEV_CHECKNAME) == 0) { 920 panic("make_dev_alias_v: bad si_name " 921 "(error=%d, si_name=%s)", error, dev->si_name); 922 } 923 dev_unlock(); 924 devfs_free(dev); 925 return (error); 926 } 927 dev->si_flags |= SI_NAMED; 928 devfs_create(dev); 929 dev_dependsl(pdev, dev); 930 clean_unrhdrl(devfs_inos); 931 dev_unlock(); 932 933 notify_create(dev, flags); 934 *cdev = dev; 935 936 return (0); 937} 938 939struct cdev * 940make_dev_alias(struct cdev *pdev, const char *fmt, ...) 941{ 942 struct cdev *dev; 943 va_list ap; 944 int res; 945 946 va_start(ap, fmt); 947 res = make_dev_alias_v(MAKEDEV_WAITOK, &dev, pdev, fmt, ap); 948 va_end(ap); 949 950 KASSERT(res == 0 && dev != NULL, 951 ("make_dev_alias: failed make_dev_alias_v (error=%d)", res)); 952 return (dev); 953} 954 955int 956make_dev_alias_p(int flags, struct cdev **cdev, struct cdev *pdev, 957 const char *fmt, ...) 958{ 959 va_list ap; 960 int res; 961 962 va_start(ap, fmt); 963 res = make_dev_alias_v(flags, cdev, pdev, fmt, ap); 964 va_end(ap); 965 return (res); 966} 967 968int 969make_dev_physpath_alias(int flags, struct cdev **cdev, struct cdev *pdev, 970 struct cdev *old_alias, const char *physpath) 971{ 972 char *devfspath; 973 int physpath_len; 974 int max_parentpath_len; 975 int parentpath_len; 976 int devfspathbuf_len; 977 int mflags; 978 int ret; 979 980 *cdev = NULL; 981 devfspath = NULL; 982 physpath_len = strlen(physpath); 983 ret = EINVAL; 984 if (physpath_len == 0) 985 goto out; 986 987 if (strncmp("id1,", physpath, 4) == 0) { 988 physpath += 4; 989 physpath_len -= 4; 990 if (physpath_len == 0) 991 goto out; 992 } 993 994 max_parentpath_len = SPECNAMELEN - physpath_len - /*/*/1; 995 parentpath_len = strlen(pdev->si_name); 996 if (max_parentpath_len < parentpath_len) { 997 printf("make_dev_physpath_alias: WARNING - Unable to alias %s " 998 "to %s/%s - path too long\n", 999 pdev->si_name, physpath, pdev->si_name); 1000 ret = ENAMETOOLONG; 1001 goto out; 1002 } 1003 1004 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; 1005 devfspathbuf_len = physpath_len + /*/*/1 + parentpath_len + /*NUL*/1; 1006 devfspath = malloc(devfspathbuf_len, M_DEVBUF, mflags); 1007 if (devfspath == NULL) { 1008 ret = ENOMEM; 1009 goto out; 1010 } 1011 1012 sprintf(devfspath, "%s/%s", physpath, pdev->si_name); 1013 if (old_alias != NULL && strcmp(old_alias->si_name, devfspath) == 0) { 1014 /* Retain the existing alias. */ 1015 *cdev = old_alias; 1016 old_alias = NULL; 1017 ret = 0; 1018 } else { 1019 ret = make_dev_alias_p(flags, cdev, pdev, "%s", devfspath); 1020 } 1021out: 1022 if (old_alias != NULL) 1023 destroy_dev(old_alias); 1024 if (devfspath != NULL) 1025 free(devfspath, M_DEVBUF); 1026 return (ret); 1027} 1028 1029static void 1030destroy_devl(struct cdev *dev) 1031{ 1032 struct cdevsw *csw; 1033 struct cdev_privdata *p; 1034 1035 mtx_assert(&devmtx, MA_OWNED); 1036 KASSERT(dev->si_flags & SI_NAMED, 1037 ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev))); 1038 KASSERT((dev->si_flags & SI_ETERNAL) == 0, 1039 ("WARNING: Driver mistake: destroy_dev on eternal %d\n", 1040 dev2unit(dev))); 1041 1042 devfs_destroy(dev); 1043 1044 /* Remove name marking */ 1045 dev->si_flags &= ~SI_NAMED; 1046 1047 dev->si_refcount++; /* Avoid race with dev_rel() */ 1048 1049 /* If we are a child, remove us from the parents list */ 1050 if (dev->si_flags & SI_CHILD) { 1051 LIST_REMOVE(dev, si_siblings); 1052 dev->si_flags &= ~SI_CHILD; 1053 } 1054 1055 /* Kill our children */ 1056 while (!LIST_EMPTY(&dev->si_children)) 1057 destroy_devl(LIST_FIRST(&dev->si_children)); 1058 1059 /* Remove from clone list */ 1060 if (dev->si_flags & SI_CLONELIST) { 1061 LIST_REMOVE(dev, si_clone); 1062 dev->si_flags &= ~SI_CLONELIST; 1063 } 1064 1065 csw = dev->si_devsw; 1066 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */ 1067 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) { 1068 csw->d_purge(dev); 1069 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10); 1070 if (dev->si_threadcount) 1071 printf("Still %lu threads in %s\n", 1072 dev->si_threadcount, devtoname(dev)); 1073 } 1074 while (dev->si_threadcount != 0) { 1075 /* Use unique dummy wait ident */ 1076 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10); 1077 } 1078 1079 dev_unlock(); 1080 notify_destroy(dev); 1081 mtx_lock(&cdevpriv_mtx); 1082 while ((p = LIST_FIRST(&cdev2priv(dev)->cdp_fdpriv)) != NULL) { 1083 devfs_destroy_cdevpriv(p); 1084 mtx_lock(&cdevpriv_mtx); 1085 } 1086 mtx_unlock(&cdevpriv_mtx); 1087 dev_lock(); 1088 1089 dev->si_drv1 = 0; 1090 dev->si_drv2 = 0; 1091 bzero(&dev->__si_u, sizeof(dev->__si_u)); 1092 1093 if (!(dev->si_flags & SI_ALIAS)) { 1094 /* Remove from cdevsw list */ 1095 LIST_REMOVE(dev, si_list); 1096 1097 /* If cdevsw has no more struct cdev *'s, clean it */ 1098 if (LIST_EMPTY(&csw->d_devs)) { 1099 fini_cdevsw(csw); 1100 wakeup(&csw->d_devs); 1101 } 1102 } 1103 dev->si_flags &= ~SI_ALIAS; 1104 dev->si_refcount--; /* Avoid race with dev_rel() */ 1105 1106 if (dev->si_refcount > 0) { 1107 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); 1108 } else { 1109 dev_free_devlocked(dev); 1110 } 1111} 1112 1113void 1114destroy_dev(struct cdev *dev) 1115{ 1116 1117 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev"); 1118 dev_lock(); 1119 destroy_devl(dev); 1120 dev_unlock_and_free(); 1121} 1122 1123const char * 1124devtoname(struct cdev *dev) 1125{ 1126 1127 return (dev->si_name); 1128} 1129 1130int 1131dev_stdclone(char *name, char **namep, const char *stem, int *unit) 1132{ 1133 int u, i; 1134 1135 i = strlen(stem); 1136 if (bcmp(stem, name, i) != 0) 1137 return (0); 1138 if (!isdigit(name[i])) 1139 return (0); 1140 u = 0; 1141 if (name[i] == '0' && isdigit(name[i+1])) 1142 return (0); 1143 while (isdigit(name[i])) { 1144 u *= 10; 1145 u += name[i++] - '0'; 1146 } 1147 if (u > 0xffffff) 1148 return (0); 1149 *unit = u; 1150 if (namep) 1151 *namep = &name[i]; 1152 if (name[i]) 1153 return (2); 1154 return (1); 1155} 1156 1157/* 1158 * Helper functions for cloning device drivers. 1159 * 1160 * The objective here is to make it unnecessary for the device drivers to 1161 * use rman or similar to manage their unit number space. Due to the way 1162 * we do "on-demand" devices, using rman or other "private" methods 1163 * will be very tricky to lock down properly once we lock down this file. 1164 * 1165 * Instead we give the drivers these routines which puts the struct cdev *'s 1166 * that are to be managed on their own list, and gives the driver the ability 1167 * to ask for the first free unit number or a given specified unit number. 1168 * 1169 * In addition these routines support paired devices (pty, nmdm and similar) 1170 * by respecting a number of "flag" bits in the minor number. 1171 * 1172 */ 1173 1174struct clonedevs { 1175 LIST_HEAD(,cdev) head; 1176}; 1177 1178void 1179clone_setup(struct clonedevs **cdp) 1180{ 1181 1182 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO); 1183 LIST_INIT(&(*cdp)->head); 1184} 1185 1186int 1187clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, 1188 struct cdev **dp, int extra) 1189{ 1190 struct clonedevs *cd; 1191 struct cdev *dev, *ndev, *dl, *de; 1192 int unit, low, u; 1193 1194 KASSERT(*cdp != NULL, 1195 ("clone_setup() not called in driver \"%s\"", csw->d_name)); 1196 KASSERT(!(extra & CLONE_UNITMASK), 1197 ("Illegal extra bits (0x%x) in clone_create", extra)); 1198 KASSERT(*up <= CLONE_UNITMASK, 1199 ("Too high unit (0x%x) in clone_create", *up)); 1200 KASSERT(csw->d_flags & D_NEEDMINOR, 1201 ("clone_create() on cdevsw without minor numbers")); 1202 1203 1204 /* 1205 * Search the list for a lot of things in one go: 1206 * A preexisting match is returned immediately. 1207 * The lowest free unit number if we are passed -1, and the place 1208 * in the list where we should insert that new element. 1209 * The place to insert a specified unit number, if applicable 1210 * the end of the list. 1211 */ 1212 unit = *up; 1213 ndev = devfs_alloc(MAKEDEV_WAITOK); 1214 dev_lock(); 1215 prep_cdevsw(csw, MAKEDEV_WAITOK); 1216 low = extra; 1217 de = dl = NULL; 1218 cd = *cdp; 1219 LIST_FOREACH(dev, &cd->head, si_clone) { 1220 KASSERT(dev->si_flags & SI_CLONELIST, 1221 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1222 u = dev2unit(dev); 1223 if (u == (unit | extra)) { 1224 *dp = dev; 1225 dev_unlock(); 1226 devfs_free(ndev); 1227 return (0); 1228 } 1229 if (unit == -1 && u == low) { 1230 low++; 1231 de = dev; 1232 continue; 1233 } else if (u < (unit | extra)) { 1234 de = dev; 1235 continue; 1236 } else if (u > (unit | extra)) { 1237 dl = dev; 1238 break; 1239 } 1240 } 1241 if (unit == -1) 1242 unit = low & CLONE_UNITMASK; 1243 dev = newdev(csw, unit | extra, ndev); 1244 if (dev->si_flags & SI_CLONELIST) { 1245 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name); 1246 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra); 1247 LIST_FOREACH(dev, &cd->head, si_clone) { 1248 printf("\t%p %s\n", dev, dev->si_name); 1249 } 1250 panic("foo"); 1251 } 1252 KASSERT(!(dev->si_flags & SI_CLONELIST), 1253 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name)); 1254 if (dl != NULL) 1255 LIST_INSERT_BEFORE(dl, dev, si_clone); 1256 else if (de != NULL) 1257 LIST_INSERT_AFTER(de, dev, si_clone); 1258 else 1259 LIST_INSERT_HEAD(&cd->head, dev, si_clone); 1260 dev->si_flags |= SI_CLONELIST; 1261 *up = unit; 1262 dev_unlock_and_free(); 1263 return (1); 1264} 1265 1266/* 1267 * Kill everything still on the list. The driver should already have 1268 * disposed of any softc hung of the struct cdev *'s at this time. 1269 */ 1270void 1271clone_cleanup(struct clonedevs **cdp) 1272{ 1273 struct cdev *dev; 1274 struct cdev_priv *cp; 1275 struct clonedevs *cd; 1276 1277 cd = *cdp; 1278 if (cd == NULL) 1279 return; 1280 dev_lock(); 1281 while (!LIST_EMPTY(&cd->head)) { 1282 dev = LIST_FIRST(&cd->head); 1283 LIST_REMOVE(dev, si_clone); 1284 KASSERT(dev->si_flags & SI_CLONELIST, 1285 ("Dev %p(%s) should be on clonelist", dev, dev->si_name)); 1286 dev->si_flags &= ~SI_CLONELIST; 1287 cp = cdev2priv(dev); 1288 if (!(cp->cdp_flags & CDP_SCHED_DTR)) { 1289 cp->cdp_flags |= CDP_SCHED_DTR; 1290 KASSERT(dev->si_flags & SI_NAMED, 1291 ("Driver has goofed in cloning underways udev %x unit %x", dev2udev(dev), dev2unit(dev))); 1292 destroy_devl(dev); 1293 } 1294 } 1295 dev_unlock_and_free(); 1296 free(cd, M_DEVBUF); 1297 *cdp = NULL; 1298} 1299 1300static TAILQ_HEAD(, cdev_priv) dev_ddtr = 1301 TAILQ_HEAD_INITIALIZER(dev_ddtr); 1302static struct task dev_dtr_task = TASK_INITIALIZER(0, destroy_dev_tq, NULL); 1303 1304static void 1305destroy_dev_tq(void *ctx, int pending) 1306{ 1307 struct cdev_priv *cp; 1308 struct cdev *dev; 1309 void (*cb)(void *); 1310 void *cb_arg; 1311 1312 dev_lock(); 1313 while (!TAILQ_EMPTY(&dev_ddtr)) { 1314 cp = TAILQ_FIRST(&dev_ddtr); 1315 dev = &cp->cdp_c; 1316 KASSERT(cp->cdp_flags & CDP_SCHED_DTR, 1317 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp)); 1318 TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list); 1319 cb = cp->cdp_dtr_cb; 1320 cb_arg = cp->cdp_dtr_cb_arg; 1321 destroy_devl(dev); 1322 dev_unlock_and_free(); 1323 dev_rel(dev); 1324 if (cb != NULL) 1325 cb(cb_arg); 1326 dev_lock(); 1327 } 1328 dev_unlock(); 1329} 1330 1331/* 1332 * devmtx shall be locked on entry. devmtx will be unlocked after 1333 * function return. 1334 */ 1335static int 1336destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg) 1337{ 1338 struct cdev_priv *cp; 1339 1340 mtx_assert(&devmtx, MA_OWNED); 1341 cp = cdev2priv(dev); 1342 if (cp->cdp_flags & CDP_SCHED_DTR) { 1343 dev_unlock(); 1344 return (0); 1345 } 1346 dev_refl(dev); 1347 cp->cdp_flags |= CDP_SCHED_DTR; 1348 cp->cdp_dtr_cb = cb; 1349 cp->cdp_dtr_cb_arg = arg; 1350 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list); 1351 dev_unlock(); 1352 taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task); 1353 return (1); 1354} 1355 1356int 1357destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg) 1358{ 1359 1360 dev_lock(); 1361 return (destroy_dev_sched_cbl(dev, cb, arg)); 1362} 1363 1364int 1365destroy_dev_sched(struct cdev *dev) 1366{ 1367 1368 return (destroy_dev_sched_cb(dev, NULL, NULL)); 1369} 1370 1371void 1372destroy_dev_drain(struct cdevsw *csw) 1373{ 1374 1375 dev_lock(); 1376 while (!LIST_EMPTY(&csw->d_devs)) { 1377 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10); 1378 } 1379 dev_unlock(); 1380} 1381 1382void 1383drain_dev_clone_events(void) 1384{ 1385 1386 sx_xlock(&clone_drain_lock); 1387 sx_xunlock(&clone_drain_lock); 1388} 1389 1390#include "opt_ddb.h" 1391#ifdef DDB 1392#include <sys/kernel.h> 1393 1394#include <ddb/ddb.h> 1395 1396DB_SHOW_COMMAND(cdev, db_show_cdev) 1397{ 1398 struct cdev_priv *cdp; 1399 struct cdev *dev; 1400 u_int flags; 1401 char buf[512]; 1402 1403 if (!have_addr) { 1404 TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { 1405 dev = &cdp->cdp_c; 1406 db_printf("%s %p\n", dev->si_name, dev); 1407 if (db_pager_quit) 1408 break; 1409 } 1410 return; 1411 } 1412 1413 dev = (struct cdev *)addr; 1414 cdp = cdev2priv(dev); 1415 db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n", 1416 dev->si_name, dev->si_refcount, dev->si_usecount, 1417 dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first); 1418 db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n", 1419 dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2); 1420 flags = dev->si_flags; 1421#define SI_FLAG(flag) do { \ 1422 if (flags & (flag)) { \ 1423 if (buf[0] != '\0') \ 1424 strlcat(buf, ", ", sizeof(buf)); \ 1425 strlcat(buf, (#flag) + 3, sizeof(buf)); \ 1426 flags &= ~(flag); \ 1427 } \ 1428} while (0) 1429 buf[0] = '\0'; 1430 SI_FLAG(SI_ETERNAL); 1431 SI_FLAG(SI_ALIAS); 1432 SI_FLAG(SI_NAMED); 1433 SI_FLAG(SI_CHEAPCLONE); 1434 SI_FLAG(SI_CHILD); 1435 SI_FLAG(SI_DEVOPEN); 1436 SI_FLAG(SI_CONSOPEN); 1437 SI_FLAG(SI_DUMPDEV); 1438 SI_FLAG(SI_CANDELETE); 1439 SI_FLAG(SI_CLONELIST); 1440 db_printf("si_flags %s\n", buf); 1441 1442 flags = cdp->cdp_flags; 1443#define CDP_FLAG(flag) do { \ 1444 if (flags & (flag)) { \ 1445 if (buf[0] != '\0') \ 1446 strlcat(buf, ", ", sizeof(buf)); \ 1447 strlcat(buf, (#flag) + 4, sizeof(buf)); \ 1448 flags &= ~(flag); \ 1449 } \ 1450} while (0) 1451 buf[0] = '\0'; 1452 CDP_FLAG(CDP_ACTIVE); 1453 CDP_FLAG(CDP_SCHED_DTR); 1454 db_printf("cdp_flags %s\n", buf); 1455} 1456#endif 1457