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: releng/9.0/sys/kern/kern_conf.c 224521 2011-07-30 14:12:37Z kib $");
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 TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list);
119 }
120
121 static void
122 cdevsw_free_devlocked(struct cdevsw *csw)
123 {
124
125 mtx_assert(&devmtx, MA_OWNED);
126 SLIST_INSERT_HEAD(&cdevsw_gt_post_list, csw, d_postfree_list);
127 }
128
129 void
130 dev_unlock(void)
131 {
132
133 mtx_unlock(&devmtx);
134 }
135
136 void
137 dev_ref(struct cdev *dev)
138 {
139
140 mtx_assert(&devmtx, MA_NOTOWNED);
141 mtx_lock(&devmtx);
142 dev->si_refcount++;
143 mtx_unlock(&devmtx);
144 }
145
146 void
147 dev_refl(struct cdev *dev)
148 {
149
150 mtx_assert(&devmtx, MA_OWNED);
151 dev->si_refcount++;
152 }
153
154 void
155 dev_rel(struct cdev *dev)
156 {
157 int flag = 0;
158
159 mtx_assert(&devmtx, MA_NOTOWNED);
160 dev_lock();
161 dev->si_refcount--;
162 KASSERT(dev->si_refcount >= 0,
163 ("dev_rel(%s) gave negative count", devtoname(dev)));
164 #if 0
165 if (dev->si_usecount == 0 &&
166 (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED))
167 ;
168 else
169 #endif
170 if (dev->si_devsw == NULL && dev->si_refcount == 0) {
171 LIST_REMOVE(dev, si_list);
172 flag = 1;
173 }
174 dev_unlock();
175 if (flag)
176 devfs_free(dev);
177 }
178
179 struct cdevsw *
180 dev_refthread(struct cdev *dev, int *ref)
181 {
182 struct cdevsw *csw;
183 struct cdev_priv *cdp;
184
185 mtx_assert(&devmtx, MA_NOTOWNED);
186 if ((dev->si_flags & SI_ETERNAL) != 0) {
187 *ref = 0;
188 return (dev->si_devsw);
189 }
190 dev_lock();
191 csw = dev->si_devsw;
192 if (csw != NULL) {
193 cdp = cdev2priv(dev);
194 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0)
195 dev->si_threadcount++;
196 else
197 csw = NULL;
198 }
199 dev_unlock();
200 *ref = 1;
201 return (csw);
202 }
203
204 struct cdevsw *
205 devvn_refthread(struct vnode *vp, struct cdev **devp, int *ref)
206 {
207 struct cdevsw *csw;
208 struct cdev_priv *cdp;
209 struct cdev *dev;
210
211 mtx_assert(&devmtx, MA_NOTOWNED);
212 if ((vp->v_vflag & VV_ETERNALDEV) != 0) {
213 dev = vp->v_rdev;
214 if (dev == NULL)
215 return (NULL);
216 KASSERT((dev->si_flags & SI_ETERNAL) != 0,
217 ("Not eternal cdev"));
218 *ref = 0;
219 csw = dev->si_devsw;
220 KASSERT(csw != NULL, ("Eternal cdev is destroyed"));
221 *devp = dev;
222 return (csw);
223 }
224
225 csw = NULL;
226 dev_lock();
227 dev = vp->v_rdev;
228 if (dev == NULL) {
229 dev_unlock();
230 return (NULL);
231 }
232 cdp = cdev2priv(dev);
233 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) {
234 csw = dev->si_devsw;
235 if (csw != NULL)
236 dev->si_threadcount++;
237 }
238 dev_unlock();
239 if (csw != NULL) {
240 *devp = dev;
241 *ref = 1;
242 }
243 return (csw);
244 }
245
246 void
247 dev_relthread(struct cdev *dev, int ref)
248 {
249
250 mtx_assert(&devmtx, MA_NOTOWNED);
251 if (!ref)
252 return;
253 dev_lock();
254 KASSERT(dev->si_threadcount > 0,
255 ("%s threadcount is wrong", dev->si_name));
256 dev->si_threadcount--;
257 dev_unlock();
258 }
259
260 int
261 nullop(void)
262 {
263
264 return (0);
265 }
266
267 int
268 eopnotsupp(void)
269 {
270
271 return (EOPNOTSUPP);
272 }
273
274 static int
275 enxio(void)
276 {
277 return (ENXIO);
278 }
279
280 static int
281 enodev(void)
282 {
283 return (ENODEV);
284 }
285
286 /* Define a dead_cdevsw for use when devices leave unexpectedly. */
287
288 #define dead_open (d_open_t *)enxio
289 #define dead_close (d_close_t *)enxio
290 #define dead_read (d_read_t *)enxio
291 #define dead_write (d_write_t *)enxio
292 #define dead_ioctl (d_ioctl_t *)enxio
293 #define dead_poll (d_poll_t *)enodev
294 #define dead_mmap (d_mmap_t *)enodev
295
296 static void
297 dead_strategy(struct bio *bp)
298 {
299
300 biofinish(bp, NULL, ENXIO);
301 }
302
303 #define dead_dump (dumper_t *)enxio
304 #define dead_kqfilter (d_kqfilter_t *)enxio
305 #define dead_mmap_single (d_mmap_single_t *)enodev
306
307 static struct cdevsw dead_cdevsw = {
308 .d_version = D_VERSION,
309 .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */
310 .d_open = dead_open,
311 .d_close = dead_close,
312 .d_read = dead_read,
313 .d_write = dead_write,
314 .d_ioctl = dead_ioctl,
315 .d_poll = dead_poll,
316 .d_mmap = dead_mmap,
317 .d_strategy = dead_strategy,
318 .d_name = "dead",
319 .d_dump = dead_dump,
320 .d_kqfilter = dead_kqfilter,
321 .d_mmap_single = dead_mmap_single
322 };
323
324 /* Default methods if driver does not specify method */
325
326 #define null_open (d_open_t *)nullop
327 #define null_close (d_close_t *)nullop
328 #define no_read (d_read_t *)enodev
329 #define no_write (d_write_t *)enodev
330 #define no_ioctl (d_ioctl_t *)enodev
331 #define no_mmap (d_mmap_t *)enodev
332 #define no_kqfilter (d_kqfilter_t *)enodev
333 #define no_mmap_single (d_mmap_single_t *)enodev
334
335 static void
336 no_strategy(struct bio *bp)
337 {
338
339 biofinish(bp, NULL, ENODEV);
340 }
341
342 static int
343 no_poll(struct cdev *dev __unused, int events, struct thread *td __unused)
344 {
345
346 return (poll_no_poll(events));
347 }
348
349 #define no_dump (dumper_t *)enodev
350
351 static int
352 giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
353 {
354 struct cdevsw *dsw;
355 int ref, retval;
356
357 dsw = dev_refthread(dev, &ref);
358 if (dsw == NULL)
359 return (ENXIO);
360 mtx_lock(&Giant);
361 retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td);
362 mtx_unlock(&Giant);
363 dev_relthread(dev, ref);
364 return (retval);
365 }
366
367 static int
368 giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp)
369 {
370 struct cdevsw *dsw;
371 int ref, retval;
372
373 dsw = dev_refthread(dev, &ref);
374 if (dsw == NULL)
375 return (ENXIO);
376 mtx_lock(&Giant);
377 retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp);
378 mtx_unlock(&Giant);
379 dev_relthread(dev, ref);
380 return (retval);
381 }
382
383 static int
384 giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
385 {
386 struct cdevsw *dsw;
387 int ref, retval;
388
389 dsw = dev_refthread(dev, &ref);
390 if (dsw == NULL)
391 return (ENXIO);
392 mtx_lock(&Giant);
393 retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td);
394 mtx_unlock(&Giant);
395 dev_relthread(dev, ref);
396 return (retval);
397 }
398
399 static void
400 giant_strategy(struct bio *bp)
401 {
402 struct cdevsw *dsw;
403 struct cdev *dev;
404 int ref;
405
406 dev = bp->bio_dev;
407 dsw = dev_refthread(dev, &ref);
408 if (dsw == NULL) {
409 biofinish(bp, NULL, ENXIO);
410 return;
411 }
412 mtx_lock(&Giant);
413 dsw->d_gianttrick->d_strategy(bp);
414 mtx_unlock(&Giant);
415 dev_relthread(dev, ref);
416 }
417
418 static int
419 giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
420 {
421 struct cdevsw *dsw;
422 int ref, retval;
423
424 dsw = dev_refthread(dev, &ref);
425 if (dsw == NULL)
426 return (ENXIO);
427 mtx_lock(&Giant);
428 retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td);
429 mtx_unlock(&Giant);
430 dev_relthread(dev, ref);
431 return (retval);
432 }
433
434 static int
435 giant_read(struct cdev *dev, struct uio *uio, int ioflag)
436 {
437 struct cdevsw *dsw;
438 int ref, retval;
439
440 dsw = dev_refthread(dev, &ref);
441 if (dsw == NULL)
442 return (ENXIO);
443 mtx_lock(&Giant);
444 retval = dsw->d_gianttrick->d_read(dev, uio, ioflag);
445 mtx_unlock(&Giant);
446 dev_relthread(dev, ref);
447 return (retval);
448 }
449
450 static int
451 giant_write(struct cdev *dev, struct uio *uio, int ioflag)
452 {
453 struct cdevsw *dsw;
454 int ref, retval;
455
456 dsw = dev_refthread(dev, &ref);
457 if (dsw == NULL)
458 return (ENXIO);
459 mtx_lock(&Giant);
460 retval = dsw->d_gianttrick->d_write(dev, uio, ioflag);
461 mtx_unlock(&Giant);
462 dev_relthread(dev, ref);
463 return (retval);
464 }
465
466 static int
467 giant_poll(struct cdev *dev, int events, struct thread *td)
468 {
469 struct cdevsw *dsw;
470 int ref, retval;
471
472 dsw = dev_refthread(dev, &ref);
473 if (dsw == NULL)
474 return (ENXIO);
475 mtx_lock(&Giant);
476 retval = dsw->d_gianttrick->d_poll(dev, events, td);
477 mtx_unlock(&Giant);
478 dev_relthread(dev, ref);
479 return (retval);
480 }
481
482 static int
483 giant_kqfilter(struct cdev *dev, struct knote *kn)
484 {
485 struct cdevsw *dsw;
486 int ref, retval;
487
488 dsw = dev_refthread(dev, &ref);
489 if (dsw == NULL)
490 return (ENXIO);
491 mtx_lock(&Giant);
492 retval = dsw->d_gianttrick->d_kqfilter(dev, kn);
493 mtx_unlock(&Giant);
494 dev_relthread(dev, ref);
495 return (retval);
496 }
497
498 static int
499 giant_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
500 vm_memattr_t *memattr)
501 {
502 struct cdevsw *dsw;
503 int ref, retval;
504
505 dsw = dev_refthread(dev, &ref);
506 if (dsw == NULL)
507 return (ENXIO);
508 mtx_lock(&Giant);
509 retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot,
510 memattr);
511 mtx_unlock(&Giant);
512 dev_relthread(dev, ref);
513 return (retval);
514 }
515
516 static int
517 giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size,
518 vm_object_t *object, int nprot)
519 {
520 struct cdevsw *dsw;
521 int ref, retval;
522
523 dsw = dev_refthread(dev, &ref);
524 if (dsw == NULL)
525 return (ENXIO);
526 mtx_lock(&Giant);
527 retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object,
528 nprot);
529 mtx_unlock(&Giant);
530 dev_relthread(dev, ref);
531 return (retval);
532 }
533
534 static void
535 notify(struct cdev *dev, const char *ev, int flags)
536 {
537 static const char prefix[] = "cdev=";
538 char *data;
539 int namelen, mflags;
540
541 if (cold)
542 return;
543 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK;
544 namelen = strlen(dev->si_name);
545 data = malloc(namelen + sizeof(prefix), M_TEMP, mflags);
546 if (data == NULL)
547 return;
548 memcpy(data, prefix, sizeof(prefix) - 1);
549 memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1);
550 devctl_notify_f("DEVFS", "CDEV", ev, data, mflags);
551 free(data, M_TEMP);
552 }
553
554 static void
555 notify_create(struct cdev *dev, int flags)
556 {
557
558 notify(dev, "CREATE", flags);
559 }
560
561 static void
562 notify_destroy(struct cdev *dev)
563 {
564
565 notify(dev, "DESTROY", MAKEDEV_WAITOK);
566 }
567
568 static struct cdev *
569 newdev(struct cdevsw *csw, int unit, struct cdev *si)
570 {
571 struct cdev *si2;
572
573 mtx_assert(&devmtx, MA_OWNED);
574 if (csw->d_flags & D_NEEDMINOR) {
575 /* We may want to return an existing device */
576 LIST_FOREACH(si2, &csw->d_devs, si_list) {
577 if (dev2unit(si2) == unit) {
578 dev_free_devlocked(si);
579 return (si2);
580 }
581 }
582 }
583 si->si_drv0 = unit;
584 si->si_devsw = csw;
585 LIST_INSERT_HEAD(&csw->d_devs, si, si_list);
586 return (si);
587 }
588
589 static void
590 fini_cdevsw(struct cdevsw *devsw)
591 {
592 struct cdevsw *gt;
593
594 if (devsw->d_gianttrick != NULL) {
595 gt = devsw->d_gianttrick;
596 memcpy(devsw, gt, sizeof *devsw);
597 cdevsw_free_devlocked(gt);
598 devsw->d_gianttrick = NULL;
599 }
600 devsw->d_flags &= ~D_INIT;
601 }
602
603 static int
604 prep_cdevsw(struct cdevsw *devsw, int flags)
605 {
606 struct cdevsw *dsw2;
607
608 mtx_assert(&devmtx, MA_OWNED);
609 if (devsw->d_flags & D_INIT)
610 return (0);
611 if (devsw->d_flags & D_NEEDGIANT) {
612 dev_unlock();
613 dsw2 = malloc(sizeof *dsw2, M_DEVT,
614 (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK);
615 dev_lock();
616 if (dsw2 == NULL && !(devsw->d_flags & D_INIT))
617 return (ENOMEM);
618 } else
619 dsw2 = NULL;
620 if (devsw->d_flags & D_INIT) {
621 if (dsw2 != NULL)
622 cdevsw_free_devlocked(dsw2);
623 return (0);
624 }
625
626 if (devsw->d_version != D_VERSION_03) {
627 printf(
628 "WARNING: Device driver \"%s\" has wrong version %s\n",
629 devsw->d_name == NULL ? "???" : devsw->d_name,
630 "and is disabled. Recompile KLD module.");
631 devsw->d_open = dead_open;
632 devsw->d_close = dead_close;
633 devsw->d_read = dead_read;
634 devsw->d_write = dead_write;
635 devsw->d_ioctl = dead_ioctl;
636 devsw->d_poll = dead_poll;
637 devsw->d_mmap = dead_mmap;
638 devsw->d_mmap_single = dead_mmap_single;
639 devsw->d_strategy = dead_strategy;
640 devsw->d_dump = dead_dump;
641 devsw->d_kqfilter = dead_kqfilter;
642 }
643
644 if (devsw->d_flags & D_NEEDGIANT) {
645 if (devsw->d_gianttrick == NULL) {
646 memcpy(dsw2, devsw, sizeof *dsw2);
647 devsw->d_gianttrick = dsw2;
648 dsw2 = NULL;
649 }
650 }
651
652 #define FIXUP(member, noop, giant) \
653 do { \
654 if (devsw->member == NULL) { \
655 devsw->member = noop; \
656 } else if (devsw->d_flags & D_NEEDGIANT) \
657 devsw->member = giant; \
658 } \
659 while (0)
660
661 FIXUP(d_open, null_open, giant_open);
662 FIXUP(d_fdopen, NULL, giant_fdopen);
663 FIXUP(d_close, null_close, giant_close);
664 FIXUP(d_read, no_read, giant_read);
665 FIXUP(d_write, no_write, giant_write);
666 FIXUP(d_ioctl, no_ioctl, giant_ioctl);
667 FIXUP(d_poll, no_poll, giant_poll);
668 FIXUP(d_mmap, no_mmap, giant_mmap);
669 FIXUP(d_strategy, no_strategy, giant_strategy);
670 FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter);
671 FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single);
672
673 if (devsw->d_dump == NULL) devsw->d_dump = no_dump;
674
675 LIST_INIT(&devsw->d_devs);
676
677 devsw->d_flags |= D_INIT;
678
679 if (dsw2 != NULL)
680 cdevsw_free_devlocked(dsw2);
681 return (0);
682 }
683
684 static int
685 prep_devname(struct cdev *dev, const char *fmt, va_list ap)
686 {
687 int len;
688 char *from, *q, *s, *to;
689
690 mtx_assert(&devmtx, MA_OWNED);
691
692 len = vsnrprintf(dev->__si_namebuf, sizeof(dev->__si_namebuf), 32,
693 fmt, ap);
694 if (len > sizeof(dev->__si_namebuf) - 1)
695 return (ENAMETOOLONG);
696
697 /* Strip leading slashes. */
698 for (from = dev->__si_namebuf; *from == '/'; from++)
699 ;
700
701 for (to = dev->__si_namebuf; *from != '\0'; from++, to++) {
702 /* Treat multiple sequential slashes as single. */
703 while (from[0] == '/' && from[1] == '/')
704 from++;
705 /* Trailing slash is considered invalid. */
706 if (from[0] == '/' && from[1] == '\0')
707 return (EINVAL);
708 *to = *from;
709 }
710 *to = '\0';
711
712 if (dev->__si_namebuf[0] == '\0')
713 return (EINVAL);
714
715 /* Disallow "." and ".." components. */
716 for (s = dev->__si_namebuf;;) {
717 for (q = s; *q != '/' && *q != '\0'; q++)
718 ;
719 if (q - s == 1 && s[0] == '.')
720 return (EINVAL);
721 if (q - s == 2 && s[0] == '.' && s[1] == '.')
722 return (EINVAL);
723 if (*q != '/')
724 break;
725 s = q + 1;
726 }
727
728 if (devfs_dev_exists(dev->__si_namebuf) != 0)
729 return (EEXIST);
730
731 return (0);
732 }
733
734 static int
735 make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit,
736 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt,
737 va_list ap)
738 {
739 struct cdev *dev, *dev_new;
740 int res;
741
742 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0,
743 ("make_dev_credv: both WAITOK and NOWAIT specified"));
744 dev_new = devfs_alloc(flags);
745 if (dev_new == NULL)
746 return (ENOMEM);
747 dev_lock();
748 res = prep_cdevsw(devsw, flags);
749 if (res != 0) {
750 dev_unlock();
751 devfs_free(dev_new);
752 return (res);
753 }
754 dev = newdev(devsw, unit, dev_new);
755 if ((dev->si_flags & SI_NAMED) == 0) {
756 res = prep_devname(dev, fmt, ap);
757 if (res != 0) {
758 if ((flags & MAKEDEV_CHECKNAME) == 0) {
759 panic(
760 "make_dev_credv: bad si_name (error=%d, si_name=%s)",
761 res, dev->si_name);
762 }
763 if (dev == dev_new) {
764 LIST_REMOVE(dev, si_list);
765 dev_unlock();
766 devfs_free(dev);
767 } else
768 dev_unlock();
769 return (res);
770 }
771 }
772 if (flags & MAKEDEV_REF)
773 dev_refl(dev);
774 if (flags & MAKEDEV_ETERNAL)
775 dev->si_flags |= SI_ETERNAL;
776 if (dev->si_flags & SI_CHEAPCLONE &&
777 dev->si_flags & SI_NAMED) {
778 /*
779 * This is allowed as it removes races and generally
780 * simplifies cloning devices.
781 * XXX: still ??
782 */
783 dev_unlock_and_free();
784 *dres = dev;
785 return (0);
786 }
787 KASSERT(!(dev->si_flags & SI_NAMED),
788 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)",
789 devsw->d_name, dev2unit(dev), devtoname(dev)));
790 dev->si_flags |= SI_NAMED;
791 if (cr != NULL)
792 dev->si_cred = crhold(cr);
793 dev->si_uid = uid;
794 dev->si_gid = gid;
795 dev->si_mode = mode;
796
797 devfs_create(dev);
798 clean_unrhdrl(devfs_inos);
799 dev_unlock_and_free();
800
801 notify_create(dev, flags);
802
803 *dres = dev;
804 return (0);
805 }
806
807 struct cdev *
808 make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode,
809 const char *fmt, ...)
810 {
811 struct cdev *dev;
812 va_list ap;
813 int res;
814
815 va_start(ap, fmt);
816 res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt,
817 ap);
818 va_end(ap);
819 KASSERT(res == 0 && dev != NULL,
820 ("make_dev: failed make_dev_credv (error=%d)", res));
821 return (dev);
822 }
823
824 struct cdev *
825 make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid,
826 gid_t gid, int mode, const char *fmt, ...)
827 {
828 struct cdev *dev;
829 va_list ap;
830 int res;
831
832 va_start(ap, fmt);
833 res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap);
834 va_end(ap);
835
836 KASSERT(res == 0 && dev != NULL,
837 ("make_dev_cred: failed make_dev_credv (error=%d)", res));
838 return (dev);
839 }
840
841 struct cdev *
842 make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr,
843 uid_t uid, gid_t gid, int mode, const char *fmt, ...)
844 {
845 struct cdev *dev;
846 va_list ap;
847 int res;
848
849 va_start(ap, fmt);
850 res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode,
851 fmt, ap);
852 va_end(ap);
853
854 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) ||
855 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0,
856 ("make_dev_credf: failed make_dev_credv (error=%d)", res));
857 return (res == 0 ? dev : NULL);
858 }
859
860 int
861 make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw,
862 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...)
863 {
864 va_list ap;
865 int res;
866
867 va_start(ap, fmt);
868 res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode,
869 fmt, ap);
870 va_end(ap);
871
872 KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) ||
873 ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0,
874 ("make_dev_p: failed make_dev_credv (error=%d)", res));
875 return (res);
876 }
877
878 static void
879 dev_dependsl(struct cdev *pdev, struct cdev *cdev)
880 {
881
882 cdev->si_parent = pdev;
883 cdev->si_flags |= SI_CHILD;
884 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
885 }
886
887
888 void
889 dev_depends(struct cdev *pdev, struct cdev *cdev)
890 {
891
892 dev_lock();
893 dev_dependsl(pdev, cdev);
894 dev_unlock();
895 }
896
897 static int
898 make_dev_alias_v(int flags, struct cdev **cdev, struct cdev *pdev,
899 const char *fmt, va_list ap)
900 {
901 struct cdev *dev;
902 int error;
903
904 KASSERT(pdev != NULL, ("make_dev_alias_v: pdev is NULL"));
905 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0,
906 ("make_dev_alias_v: both WAITOK and NOWAIT specified"));
907 KASSERT((flags & ~(MAKEDEV_WAITOK | MAKEDEV_NOWAIT |
908 MAKEDEV_CHECKNAME)) == 0,
909 ("make_dev_alias_v: invalid flags specified (flags=%02x)", flags));
910
911 dev = devfs_alloc(flags);
912 if (dev == NULL)
913 return (ENOMEM);
914 dev_lock();
915 dev->si_flags |= SI_ALIAS;
916 error = prep_devname(dev, fmt, ap);
917 if (error != 0) {
918 if ((flags & MAKEDEV_CHECKNAME) == 0) {
919 panic("make_dev_alias_v: bad si_name "
920 "(error=%d, si_name=%s)", error, dev->si_name);
921 }
922 dev_unlock();
923 devfs_free(dev);
924 return (error);
925 }
926 dev->si_flags |= SI_NAMED;
927 devfs_create(dev);
928 dev_dependsl(pdev, dev);
929 clean_unrhdrl(devfs_inos);
930 dev_unlock();
931
932 notify_create(dev, flags);
933 *cdev = dev;
934
935 return (0);
936 }
937
938 struct cdev *
939 make_dev_alias(struct cdev *pdev, const char *fmt, ...)
940 {
941 struct cdev *dev;
942 va_list ap;
943 int res;
944
945 va_start(ap, fmt);
946 res = make_dev_alias_v(MAKEDEV_WAITOK, &dev, pdev, fmt, ap);
947 va_end(ap);
948
949 KASSERT(res == 0 && dev != NULL,
950 ("make_dev_alias: failed make_dev_alias_v (error=%d)", res));
951 return (dev);
952 }
953
954 int
955 make_dev_alias_p(int flags, struct cdev **cdev, struct cdev *pdev,
956 const char *fmt, ...)
957 {
958 va_list ap;
959 int res;
960
961 va_start(ap, fmt);
962 res = make_dev_alias_v(flags, cdev, pdev, fmt, ap);
963 va_end(ap);
964 return (res);
965 }
966
967 int
968 make_dev_physpath_alias(int flags, struct cdev **cdev, struct cdev *pdev,
969 struct cdev *old_alias, const char *physpath)
970 {
971 char *devfspath;
972 int physpath_len;
973 int max_parentpath_len;
974 int parentpath_len;
975 int devfspathbuf_len;
976 int mflags;
977 int ret;
978
979 *cdev = NULL;
980 devfspath = NULL;
981 physpath_len = strlen(physpath);
982 ret = EINVAL;
983 if (physpath_len == 0)
984 goto out;
985
986 if (strncmp("id1,", physpath, 4) == 0) {
987 physpath += 4;
988 physpath_len -= 4;
989 if (physpath_len == 0)
990 goto out;
991 }
992
993 max_parentpath_len = SPECNAMELEN - physpath_len - /*/*/1;
994 parentpath_len = strlen(pdev->si_name);
995 if (max_parentpath_len < parentpath_len) {
996 printf("make_dev_physpath_alias: WARNING - Unable to alias %s "
997 "to %s/%s - path too long\n",
998 pdev->si_name, physpath, pdev->si_name);
999 ret = ENAMETOOLONG;
1000 goto out;
1001 }
1002
1003 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK;
1004 devfspathbuf_len = physpath_len + /*/*/1 + parentpath_len + /*NUL*/1;
1005 devfspath = malloc(devfspathbuf_len, M_DEVBUF, mflags);
1006 if (devfspath == NULL) {
1007 ret = ENOMEM;
1008 goto out;
1009 }
1010
1011 sprintf(devfspath, "%s/%s", physpath, pdev->si_name);
1012 if (old_alias != NULL
1013 && 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, devfspath);
1020 }
1021 out:
1022 if (old_alias != NULL)
1023 destroy_dev(old_alias);
1024 if (devfspath != NULL)
1025 free(devfspath, M_DEVBUF);
1026 return (ret);
1027 }
1028
1029 static void
1030 destroy_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
1113 void
1114 destroy_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
1123 const char *
1124 devtoname(struct cdev *dev)
1125 {
1126
1127 return (dev->si_name);
1128 }
1129
1130 int
1131 dev_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] == '' && isdigit(name[i+1]))
1142 return (0);
1143 while (isdigit(name[i])) {
1144 u *= 10;
1145 u += name[i++] - '';
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
1174 struct clonedevs {
1175 LIST_HEAD(,cdev) head;
1176 };
1177
1178 void
1179 clone_setup(struct clonedevs **cdp)
1180 {
1181
1182 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO);
1183 LIST_INIT(&(*cdp)->head);
1184 }
1185
1186 int
1187 clone_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 */
1270 void
1271 clone_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
1300 static TAILQ_HEAD(, cdev_priv) dev_ddtr =
1301 TAILQ_HEAD_INITIALIZER(dev_ddtr);
1302 static struct task dev_dtr_task;
1303
1304 static void
1305 destroy_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 */
1335 static int
1336 destroy_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
1356 int
1357 destroy_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
1364 int
1365 destroy_dev_sched(struct cdev *dev)
1366 {
1367
1368 return (destroy_dev_sched_cb(dev, NULL, NULL));
1369 }
1370
1371 void
1372 destroy_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
1382 void
1383 drain_dev_clone_events(void)
1384 {
1385
1386 sx_xlock(&clone_drain_lock);
1387 sx_xunlock(&clone_drain_lock);
1388 }
1389
1390 static void
1391 devdtr_init(void *dummy __unused)
1392 {
1393
1394 TASK_INIT(&dev_dtr_task, 0, destroy_dev_tq, NULL);
1395 }
1396
1397 SYSINIT(devdtr, SI_SUB_DEVFS, SI_ORDER_SECOND, devdtr_init, NULL);
1398
1399 #include "opt_ddb.h"
1400 #ifdef DDB
1401 #include <sys/kernel.h>
1402
1403 #include <ddb/ddb.h>
1404
1405 DB_SHOW_COMMAND(cdev, db_show_cdev)
1406 {
1407 struct cdev_priv *cdp;
1408 struct cdev *dev;
1409 u_int flags;
1410 char buf[512];
1411
1412 if (!have_addr) {
1413 TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) {
1414 dev = &cdp->cdp_c;
1415 db_printf("%s %p\n", dev->si_name, dev);
1416 if (db_pager_quit)
1417 break;
1418 }
1419 return;
1420 }
1421
1422 dev = (struct cdev *)addr;
1423 cdp = cdev2priv(dev);
1424 db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n",
1425 dev->si_name, dev->si_refcount, dev->si_usecount,
1426 dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first);
1427 db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n",
1428 dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2);
1429 flags = dev->si_flags;
1430 #define SI_FLAG(flag) do { \
1431 if (flags & (flag)) { \
1432 if (buf[0] != '\0') \
1433 strlcat(buf, ", ", sizeof(buf)); \
1434 strlcat(buf, (#flag) + 3, sizeof(buf)); \
1435 flags &= ~(flag); \
1436 } \
1437 } while (0)
1438 buf[0] = '\0';
1439 SI_FLAG(SI_ETERNAL);
1440 SI_FLAG(SI_ALIAS);
1441 SI_FLAG(SI_NAMED);
1442 SI_FLAG(SI_CHEAPCLONE);
1443 SI_FLAG(SI_CHILD);
1444 SI_FLAG(SI_DEVOPEN);
1445 SI_FLAG(SI_CONSOPEN);
1446 SI_FLAG(SI_DUMPDEV);
1447 SI_FLAG(SI_CANDELETE);
1448 SI_FLAG(SI_CLONELIST);
1449 db_printf("si_flags %s\n", buf);
1450
1451 flags = cdp->cdp_flags;
1452 #define CDP_FLAG(flag) do { \
1453 if (flags & (flag)) { \
1454 if (buf[0] != '\0') \
1455 strlcat(buf, ", ", sizeof(buf)); \
1456 strlcat(buf, (#flag) + 4, sizeof(buf)); \
1457 flags &= ~(flag); \
1458 } \
1459 } while (0)
1460 buf[0] = '\0';
1461 CDP_FLAG(CDP_ACTIVE);
1462 CDP_FLAG(CDP_SCHED_DTR);
1463 db_printf("cdp_flags %s\n", buf);
1464 }
1465 #endif
Cache object: c046109e6af1d473f60dcf9e61d6b109
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