FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_conf.c
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_mmap_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_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
517 static int
518 giant_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
535 static void
536 notify(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
555 static void
556 notify_create(struct cdev *dev, int flags)
557 {
558
559 notify(dev, "CREATE", flags);
560 }
561
562 static void
563 notify_destroy(struct cdev *dev)
564 {
565
566 notify(dev, "DESTROY", MAKEDEV_WAITOK);
567 }
568
569 static struct cdev *
570 newdev(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
590 static void
591 fini_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
604 static int
605 prep_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
685 static int
686 prep_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_namebuf, sizeof(dev->__si_namebuf), 32,
694 fmt, ap);
695 if (len > sizeof(dev->__si_namebuf) - 1)
696 return (ENAMETOOLONG);
697
698 /* Strip leading slashes. */
699 for (from = dev->__si_namebuf; *from == '/'; from++)
700 ;
701
702 for (to = dev->__si_namebuf; *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_namebuf[0] == '\0')
714 return (EINVAL);
715
716 /* Disallow "." and ".." components. */
717 for (s = dev->__si_namebuf;;) {
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_namebuf) != 0)
730 return (EEXIST);
731
732 return (0);
733 }
734
735 static int
736 make_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
808 struct cdev *
809 make_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
825 struct cdev *
826 make_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
842 struct cdev *
843 make_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
861 int
862 make_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
879 static void
880 dev_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
889 void
890 dev_depends(struct cdev *pdev, struct cdev *cdev)
891 {
892
893 dev_lock();
894 dev_dependsl(pdev, cdev);
895 dev_unlock();
896 }
897
898 static int
899 make_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
939 struct cdev *
940 make_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
955 int
956 make_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
968 int
969 make_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 if (bootverbose)
998 printf("WARNING: Unable to alias %s "
999 "to %s/%s - path too long\n",
1000 pdev->si_name, physpath, pdev->si_name);
1001 ret = ENAMETOOLONG;
1002 goto out;
1003 }
1004
1005 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK;
1006 devfspathbuf_len = physpath_len + /*/*/1 + parentpath_len + /*NUL*/1;
1007 devfspath = malloc(devfspathbuf_len, M_DEVBUF, mflags);
1008 if (devfspath == NULL) {
1009 ret = ENOMEM;
1010 goto out;
1011 }
1012
1013 sprintf(devfspath, "%s/%s", physpath, pdev->si_name);
1014 if (old_alias != NULL && strcmp(old_alias->si_name, devfspath) == 0) {
1015 /* Retain the existing alias. */
1016 *cdev = old_alias;
1017 old_alias = NULL;
1018 ret = 0;
1019 } else {
1020 ret = make_dev_alias_p(flags, cdev, pdev, "%s", devfspath);
1021 }
1022 out:
1023 if (old_alias != NULL)
1024 destroy_dev(old_alias);
1025 if (devfspath != NULL)
1026 free(devfspath, M_DEVBUF);
1027 return (ret);
1028 }
1029
1030 static void
1031 destroy_devl(struct cdev *dev)
1032 {
1033 struct cdevsw *csw;
1034 struct cdev_privdata *p;
1035 struct cdev_priv *cdp;
1036
1037 mtx_assert(&devmtx, MA_OWNED);
1038 KASSERT(dev->si_flags & SI_NAMED,
1039 ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev)));
1040 KASSERT((dev->si_flags & SI_ETERNAL) == 0,
1041 ("WARNING: Driver mistake: destroy_dev on eternal %d\n",
1042 dev2unit(dev)));
1043
1044 cdp = cdev2priv(dev);
1045 if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) {
1046 /*
1047 * Avoid race with dev_rel(), e.g. from the populate
1048 * loop. If CDP_UNREF_DTR flag is set, the reference
1049 * to be dropped at the end of destroy_devl() was
1050 * already taken by delist_dev_locked().
1051 */
1052 dev_refl(dev);
1053
1054 devfs_destroy(dev);
1055 }
1056
1057 /* Remove name marking */
1058 dev->si_flags &= ~SI_NAMED;
1059
1060 /* If we are a child, remove us from the parents list */
1061 if (dev->si_flags & SI_CHILD) {
1062 LIST_REMOVE(dev, si_siblings);
1063 dev->si_flags &= ~SI_CHILD;
1064 }
1065
1066 /* Kill our children */
1067 while (!LIST_EMPTY(&dev->si_children))
1068 destroy_devl(LIST_FIRST(&dev->si_children));
1069
1070 /* Remove from clone list */
1071 if (dev->si_flags & SI_CLONELIST) {
1072 LIST_REMOVE(dev, si_clone);
1073 dev->si_flags &= ~SI_CLONELIST;
1074 }
1075
1076 csw = dev->si_devsw;
1077 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */
1078 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) {
1079 csw->d_purge(dev);
1080 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10);
1081 if (dev->si_threadcount)
1082 printf("Still %lu threads in %s\n",
1083 dev->si_threadcount, devtoname(dev));
1084 }
1085 while (dev->si_threadcount != 0) {
1086 /* Use unique dummy wait ident */
1087 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10);
1088 }
1089
1090 dev_unlock();
1091 if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) {
1092 /* avoid out of order notify events */
1093 notify_destroy(dev);
1094 }
1095 mtx_lock(&cdevpriv_mtx);
1096 while ((p = LIST_FIRST(&cdp->cdp_fdpriv)) != NULL) {
1097 devfs_destroy_cdevpriv(p);
1098 mtx_lock(&cdevpriv_mtx);
1099 }
1100 mtx_unlock(&cdevpriv_mtx);
1101 dev_lock();
1102
1103 dev->si_drv1 = 0;
1104 dev->si_drv2 = 0;
1105 bzero(&dev->__si_u, sizeof(dev->__si_u));
1106
1107 if (!(dev->si_flags & SI_ALIAS)) {
1108 /* Remove from cdevsw list */
1109 LIST_REMOVE(dev, si_list);
1110
1111 /* If cdevsw has no more struct cdev *'s, clean it */
1112 if (LIST_EMPTY(&csw->d_devs)) {
1113 fini_cdevsw(csw);
1114 wakeup(&csw->d_devs);
1115 }
1116 }
1117 dev->si_flags &= ~SI_ALIAS;
1118 cdp->cdp_flags &= ~CDP_UNREF_DTR;
1119 dev->si_refcount--;
1120
1121 if (dev->si_refcount > 0)
1122 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
1123 else
1124 dev_free_devlocked(dev);
1125 }
1126
1127 static void
1128 delist_dev_locked(struct cdev *dev)
1129 {
1130 struct cdev_priv *cdp;
1131 struct cdev *child;
1132
1133 mtx_assert(&devmtx, MA_OWNED);
1134 cdp = cdev2priv(dev);
1135 if ((cdp->cdp_flags & CDP_UNREF_DTR) != 0)
1136 return;
1137 cdp->cdp_flags |= CDP_UNREF_DTR;
1138 dev_refl(dev);
1139 devfs_destroy(dev);
1140 LIST_FOREACH(child, &dev->si_children, si_siblings)
1141 delist_dev_locked(child);
1142 dev_unlock();
1143 /* ensure the destroy event is queued in order */
1144 notify_destroy(dev);
1145 dev_lock();
1146 }
1147
1148 /*
1149 * This function will delist a character device and its children from
1150 * the directory listing and create a destroy event without waiting
1151 * for all character device references to go away. At some later point
1152 * destroy_dev() must be called to complete the character device
1153 * destruction. After calling this function the character device name
1154 * can instantly be re-used.
1155 */
1156 void
1157 delist_dev(struct cdev *dev)
1158 {
1159
1160 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "delist_dev");
1161 dev_lock();
1162 delist_dev_locked(dev);
1163 dev_unlock();
1164 }
1165
1166 void
1167 destroy_dev(struct cdev *dev)
1168 {
1169
1170 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev");
1171 dev_lock();
1172 destroy_devl(dev);
1173 dev_unlock_and_free();
1174 }
1175
1176 const char *
1177 devtoname(struct cdev *dev)
1178 {
1179
1180 return (dev->si_name);
1181 }
1182
1183 int
1184 dev_stdclone(char *name, char **namep, const char *stem, int *unit)
1185 {
1186 int u, i;
1187
1188 i = strlen(stem);
1189 if (bcmp(stem, name, i) != 0)
1190 return (0);
1191 if (!isdigit(name[i]))
1192 return (0);
1193 u = 0;
1194 if (name[i] == '' && isdigit(name[i+1]))
1195 return (0);
1196 while (isdigit(name[i])) {
1197 u *= 10;
1198 u += name[i++] - '';
1199 }
1200 if (u > 0xffffff)
1201 return (0);
1202 *unit = u;
1203 if (namep)
1204 *namep = &name[i];
1205 if (name[i])
1206 return (2);
1207 return (1);
1208 }
1209
1210 /*
1211 * Helper functions for cloning device drivers.
1212 *
1213 * The objective here is to make it unnecessary for the device drivers to
1214 * use rman or similar to manage their unit number space. Due to the way
1215 * we do "on-demand" devices, using rman or other "private" methods
1216 * will be very tricky to lock down properly once we lock down this file.
1217 *
1218 * Instead we give the drivers these routines which puts the struct cdev *'s
1219 * that are to be managed on their own list, and gives the driver the ability
1220 * to ask for the first free unit number or a given specified unit number.
1221 *
1222 * In addition these routines support paired devices (pty, nmdm and similar)
1223 * by respecting a number of "flag" bits in the minor number.
1224 *
1225 */
1226
1227 struct clonedevs {
1228 LIST_HEAD(,cdev) head;
1229 };
1230
1231 void
1232 clone_setup(struct clonedevs **cdp)
1233 {
1234
1235 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO);
1236 LIST_INIT(&(*cdp)->head);
1237 }
1238
1239 int
1240 clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up,
1241 struct cdev **dp, int extra)
1242 {
1243 struct clonedevs *cd;
1244 struct cdev *dev, *ndev, *dl, *de;
1245 int unit, low, u;
1246
1247 KASSERT(*cdp != NULL,
1248 ("clone_setup() not called in driver \"%s\"", csw->d_name));
1249 KASSERT(!(extra & CLONE_UNITMASK),
1250 ("Illegal extra bits (0x%x) in clone_create", extra));
1251 KASSERT(*up <= CLONE_UNITMASK,
1252 ("Too high unit (0x%x) in clone_create", *up));
1253 KASSERT(csw->d_flags & D_NEEDMINOR,
1254 ("clone_create() on cdevsw without minor numbers"));
1255
1256
1257 /*
1258 * Search the list for a lot of things in one go:
1259 * A preexisting match is returned immediately.
1260 * The lowest free unit number if we are passed -1, and the place
1261 * in the list where we should insert that new element.
1262 * The place to insert a specified unit number, if applicable
1263 * the end of the list.
1264 */
1265 unit = *up;
1266 ndev = devfs_alloc(MAKEDEV_WAITOK);
1267 dev_lock();
1268 prep_cdevsw(csw, MAKEDEV_WAITOK);
1269 low = extra;
1270 de = dl = NULL;
1271 cd = *cdp;
1272 LIST_FOREACH(dev, &cd->head, si_clone) {
1273 KASSERT(dev->si_flags & SI_CLONELIST,
1274 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
1275 u = dev2unit(dev);
1276 if (u == (unit | extra)) {
1277 *dp = dev;
1278 dev_unlock();
1279 devfs_free(ndev);
1280 return (0);
1281 }
1282 if (unit == -1 && u == low) {
1283 low++;
1284 de = dev;
1285 continue;
1286 } else if (u < (unit | extra)) {
1287 de = dev;
1288 continue;
1289 } else if (u > (unit | extra)) {
1290 dl = dev;
1291 break;
1292 }
1293 }
1294 if (unit == -1)
1295 unit = low & CLONE_UNITMASK;
1296 dev = newdev(csw, unit | extra, ndev);
1297 if (dev->si_flags & SI_CLONELIST) {
1298 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name);
1299 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra);
1300 LIST_FOREACH(dev, &cd->head, si_clone) {
1301 printf("\t%p %s\n", dev, dev->si_name);
1302 }
1303 panic("foo");
1304 }
1305 KASSERT(!(dev->si_flags & SI_CLONELIST),
1306 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name));
1307 if (dl != NULL)
1308 LIST_INSERT_BEFORE(dl, dev, si_clone);
1309 else if (de != NULL)
1310 LIST_INSERT_AFTER(de, dev, si_clone);
1311 else
1312 LIST_INSERT_HEAD(&cd->head, dev, si_clone);
1313 dev->si_flags |= SI_CLONELIST;
1314 *up = unit;
1315 dev_unlock_and_free();
1316 return (1);
1317 }
1318
1319 /*
1320 * Kill everything still on the list. The driver should already have
1321 * disposed of any softc hung of the struct cdev *'s at this time.
1322 */
1323 void
1324 clone_cleanup(struct clonedevs **cdp)
1325 {
1326 struct cdev *dev;
1327 struct cdev_priv *cp;
1328 struct clonedevs *cd;
1329
1330 cd = *cdp;
1331 if (cd == NULL)
1332 return;
1333 dev_lock();
1334 while (!LIST_EMPTY(&cd->head)) {
1335 dev = LIST_FIRST(&cd->head);
1336 LIST_REMOVE(dev, si_clone);
1337 KASSERT(dev->si_flags & SI_CLONELIST,
1338 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
1339 dev->si_flags &= ~SI_CLONELIST;
1340 cp = cdev2priv(dev);
1341 if (!(cp->cdp_flags & CDP_SCHED_DTR)) {
1342 cp->cdp_flags |= CDP_SCHED_DTR;
1343 KASSERT(dev->si_flags & SI_NAMED,
1344 ("Driver has goofed in cloning underways udev %x unit %x", dev2udev(dev), dev2unit(dev)));
1345 destroy_devl(dev);
1346 }
1347 }
1348 dev_unlock_and_free();
1349 free(cd, M_DEVBUF);
1350 *cdp = NULL;
1351 }
1352
1353 static TAILQ_HEAD(, cdev_priv) dev_ddtr =
1354 TAILQ_HEAD_INITIALIZER(dev_ddtr);
1355 static struct task dev_dtr_task;
1356
1357 static void
1358 destroy_dev_tq(void *ctx, int pending)
1359 {
1360 struct cdev_priv *cp;
1361 struct cdev *dev;
1362 void (*cb)(void *);
1363 void *cb_arg;
1364
1365 dev_lock();
1366 while (!TAILQ_EMPTY(&dev_ddtr)) {
1367 cp = TAILQ_FIRST(&dev_ddtr);
1368 dev = &cp->cdp_c;
1369 KASSERT(cp->cdp_flags & CDP_SCHED_DTR,
1370 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp));
1371 TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list);
1372 cb = cp->cdp_dtr_cb;
1373 cb_arg = cp->cdp_dtr_cb_arg;
1374 destroy_devl(dev);
1375 dev_unlock_and_free();
1376 dev_rel(dev);
1377 if (cb != NULL)
1378 cb(cb_arg);
1379 dev_lock();
1380 }
1381 dev_unlock();
1382 }
1383
1384 /*
1385 * devmtx shall be locked on entry. devmtx will be unlocked after
1386 * function return.
1387 */
1388 static int
1389 destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg)
1390 {
1391 struct cdev_priv *cp;
1392
1393 mtx_assert(&devmtx, MA_OWNED);
1394 cp = cdev2priv(dev);
1395 if (cp->cdp_flags & CDP_SCHED_DTR) {
1396 dev_unlock();
1397 return (0);
1398 }
1399 dev_refl(dev);
1400 cp->cdp_flags |= CDP_SCHED_DTR;
1401 cp->cdp_dtr_cb = cb;
1402 cp->cdp_dtr_cb_arg = arg;
1403 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list);
1404 dev_unlock();
1405 taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task);
1406 return (1);
1407 }
1408
1409 int
1410 destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg)
1411 {
1412
1413 dev_lock();
1414 return (destroy_dev_sched_cbl(dev, cb, arg));
1415 }
1416
1417 int
1418 destroy_dev_sched(struct cdev *dev)
1419 {
1420
1421 return (destroy_dev_sched_cb(dev, NULL, NULL));
1422 }
1423
1424 void
1425 destroy_dev_drain(struct cdevsw *csw)
1426 {
1427
1428 dev_lock();
1429 while (!LIST_EMPTY(&csw->d_devs)) {
1430 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10);
1431 }
1432 dev_unlock();
1433 }
1434
1435 void
1436 drain_dev_clone_events(void)
1437 {
1438
1439 sx_xlock(&clone_drain_lock);
1440 sx_xunlock(&clone_drain_lock);
1441 }
1442
1443 static void
1444 devdtr_init(void *dummy __unused)
1445 {
1446
1447 TASK_INIT(&dev_dtr_task, 0, destroy_dev_tq, NULL);
1448 }
1449
1450 SYSINIT(devdtr, SI_SUB_DEVFS, SI_ORDER_SECOND, devdtr_init, NULL);
1451
1452 #include "opt_ddb.h"
1453 #ifdef DDB
1454 #include <sys/kernel.h>
1455
1456 #include <ddb/ddb.h>
1457
1458 DB_SHOW_COMMAND(cdev, db_show_cdev)
1459 {
1460 struct cdev_priv *cdp;
1461 struct cdev *dev;
1462 u_int flags;
1463 char buf[512];
1464
1465 if (!have_addr) {
1466 TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) {
1467 dev = &cdp->cdp_c;
1468 db_printf("%s %p\n", dev->si_name, dev);
1469 if (db_pager_quit)
1470 break;
1471 }
1472 return;
1473 }
1474
1475 dev = (struct cdev *)addr;
1476 cdp = cdev2priv(dev);
1477 db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n",
1478 dev->si_name, dev->si_refcount, dev->si_usecount,
1479 dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first);
1480 db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n",
1481 dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2);
1482 flags = dev->si_flags;
1483 #define SI_FLAG(flag) do { \
1484 if (flags & (flag)) { \
1485 if (buf[0] != '\0') \
1486 strlcat(buf, ", ", sizeof(buf)); \
1487 strlcat(buf, (#flag) + 3, sizeof(buf)); \
1488 flags &= ~(flag); \
1489 } \
1490 } while (0)
1491 buf[0] = '\0';
1492 SI_FLAG(SI_ETERNAL);
1493 SI_FLAG(SI_ALIAS);
1494 SI_FLAG(SI_NAMED);
1495 SI_FLAG(SI_CHEAPCLONE);
1496 SI_FLAG(SI_CHILD);
1497 SI_FLAG(SI_DEVOPEN);
1498 SI_FLAG(SI_CONSOPEN);
1499 SI_FLAG(SI_DUMPDEV);
1500 SI_FLAG(SI_CANDELETE);
1501 SI_FLAG(SI_CLONELIST);
1502 db_printf("si_flags %s\n", buf);
1503
1504 flags = cdp->cdp_flags;
1505 #define CDP_FLAG(flag) do { \
1506 if (flags & (flag)) { \
1507 if (buf[0] != '\0') \
1508 strlcat(buf, ", ", sizeof(buf)); \
1509 strlcat(buf, (#flag) + 4, sizeof(buf)); \
1510 flags &= ~(flag); \
1511 } \
1512 } while (0)
1513 buf[0] = '\0';
1514 CDP_FLAG(CDP_ACTIVE);
1515 CDP_FLAG(CDP_SCHED_DTR);
1516 db_printf("cdp_flags %s\n", buf);
1517 }
1518 #endif
Cache object: efd1c30c66111a39fb57e2977a51210b
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