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/9.1/sys/kern/kern_conf.c 229026 2011-12-30 20:52:56Z 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 && strcmp(old_alias->si_name, devfspath) == 0) {
1013 /* Retain the existing alias. */
1014 *cdev = old_alias;
1015 old_alias = NULL;
1016 ret = 0;
1017 } else {
1018 ret = make_dev_alias_p(flags, cdev, pdev, "%s", devfspath);
1019 }
1020 out:
1021 if (old_alias != NULL)
1022 destroy_dev(old_alias);
1023 if (devfspath != NULL)
1024 free(devfspath, M_DEVBUF);
1025 return (ret);
1026 }
1027
1028 static void
1029 destroy_devl(struct cdev *dev)
1030 {
1031 struct cdevsw *csw;
1032 struct cdev_privdata *p;
1033
1034 mtx_assert(&devmtx, MA_OWNED);
1035 KASSERT(dev->si_flags & SI_NAMED,
1036 ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev)));
1037 KASSERT((dev->si_flags & SI_ETERNAL) == 0,
1038 ("WARNING: Driver mistake: destroy_dev on eternal %d\n",
1039 dev2unit(dev)));
1040
1041 devfs_destroy(dev);
1042
1043 /* Remove name marking */
1044 dev->si_flags &= ~SI_NAMED;
1045
1046 dev->si_refcount++; /* Avoid race with dev_rel() */
1047
1048 /* If we are a child, remove us from the parents list */
1049 if (dev->si_flags & SI_CHILD) {
1050 LIST_REMOVE(dev, si_siblings);
1051 dev->si_flags &= ~SI_CHILD;
1052 }
1053
1054 /* Kill our children */
1055 while (!LIST_EMPTY(&dev->si_children))
1056 destroy_devl(LIST_FIRST(&dev->si_children));
1057
1058 /* Remove from clone list */
1059 if (dev->si_flags & SI_CLONELIST) {
1060 LIST_REMOVE(dev, si_clone);
1061 dev->si_flags &= ~SI_CLONELIST;
1062 }
1063
1064 csw = dev->si_devsw;
1065 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */
1066 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) {
1067 csw->d_purge(dev);
1068 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10);
1069 if (dev->si_threadcount)
1070 printf("Still %lu threads in %s\n",
1071 dev->si_threadcount, devtoname(dev));
1072 }
1073 while (dev->si_threadcount != 0) {
1074 /* Use unique dummy wait ident */
1075 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10);
1076 }
1077
1078 dev_unlock();
1079 notify_destroy(dev);
1080 mtx_lock(&cdevpriv_mtx);
1081 while ((p = LIST_FIRST(&cdev2priv(dev)->cdp_fdpriv)) != NULL) {
1082 devfs_destroy_cdevpriv(p);
1083 mtx_lock(&cdevpriv_mtx);
1084 }
1085 mtx_unlock(&cdevpriv_mtx);
1086 dev_lock();
1087
1088 dev->si_drv1 = 0;
1089 dev->si_drv2 = 0;
1090 bzero(&dev->__si_u, sizeof(dev->__si_u));
1091
1092 if (!(dev->si_flags & SI_ALIAS)) {
1093 /* Remove from cdevsw list */
1094 LIST_REMOVE(dev, si_list);
1095
1096 /* If cdevsw has no more struct cdev *'s, clean it */
1097 if (LIST_EMPTY(&csw->d_devs)) {
1098 fini_cdevsw(csw);
1099 wakeup(&csw->d_devs);
1100 }
1101 }
1102 dev->si_flags &= ~SI_ALIAS;
1103 dev->si_refcount--; /* Avoid race with dev_rel() */
1104
1105 if (dev->si_refcount > 0) {
1106 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
1107 } else {
1108 dev_free_devlocked(dev);
1109 }
1110 }
1111
1112 void
1113 destroy_dev(struct cdev *dev)
1114 {
1115
1116 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev");
1117 dev_lock();
1118 destroy_devl(dev);
1119 dev_unlock_and_free();
1120 }
1121
1122 const char *
1123 devtoname(struct cdev *dev)
1124 {
1125
1126 return (dev->si_name);
1127 }
1128
1129 int
1130 dev_stdclone(char *name, char **namep, const char *stem, int *unit)
1131 {
1132 int u, i;
1133
1134 i = strlen(stem);
1135 if (bcmp(stem, name, i) != 0)
1136 return (0);
1137 if (!isdigit(name[i]))
1138 return (0);
1139 u = 0;
1140 if (name[i] == '' && isdigit(name[i+1]))
1141 return (0);
1142 while (isdigit(name[i])) {
1143 u *= 10;
1144 u += name[i++] - '';
1145 }
1146 if (u > 0xffffff)
1147 return (0);
1148 *unit = u;
1149 if (namep)
1150 *namep = &name[i];
1151 if (name[i])
1152 return (2);
1153 return (1);
1154 }
1155
1156 /*
1157 * Helper functions for cloning device drivers.
1158 *
1159 * The objective here is to make it unnecessary for the device drivers to
1160 * use rman or similar to manage their unit number space. Due to the way
1161 * we do "on-demand" devices, using rman or other "private" methods
1162 * will be very tricky to lock down properly once we lock down this file.
1163 *
1164 * Instead we give the drivers these routines which puts the struct cdev *'s
1165 * that are to be managed on their own list, and gives the driver the ability
1166 * to ask for the first free unit number or a given specified unit number.
1167 *
1168 * In addition these routines support paired devices (pty, nmdm and similar)
1169 * by respecting a number of "flag" bits in the minor number.
1170 *
1171 */
1172
1173 struct clonedevs {
1174 LIST_HEAD(,cdev) head;
1175 };
1176
1177 void
1178 clone_setup(struct clonedevs **cdp)
1179 {
1180
1181 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO);
1182 LIST_INIT(&(*cdp)->head);
1183 }
1184
1185 int
1186 clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up,
1187 struct cdev **dp, int extra)
1188 {
1189 struct clonedevs *cd;
1190 struct cdev *dev, *ndev, *dl, *de;
1191 int unit, low, u;
1192
1193 KASSERT(*cdp != NULL,
1194 ("clone_setup() not called in driver \"%s\"", csw->d_name));
1195 KASSERT(!(extra & CLONE_UNITMASK),
1196 ("Illegal extra bits (0x%x) in clone_create", extra));
1197 KASSERT(*up <= CLONE_UNITMASK,
1198 ("Too high unit (0x%x) in clone_create", *up));
1199 KASSERT(csw->d_flags & D_NEEDMINOR,
1200 ("clone_create() on cdevsw without minor numbers"));
1201
1202
1203 /*
1204 * Search the list for a lot of things in one go:
1205 * A preexisting match is returned immediately.
1206 * The lowest free unit number if we are passed -1, and the place
1207 * in the list where we should insert that new element.
1208 * The place to insert a specified unit number, if applicable
1209 * the end of the list.
1210 */
1211 unit = *up;
1212 ndev = devfs_alloc(MAKEDEV_WAITOK);
1213 dev_lock();
1214 prep_cdevsw(csw, MAKEDEV_WAITOK);
1215 low = extra;
1216 de = dl = NULL;
1217 cd = *cdp;
1218 LIST_FOREACH(dev, &cd->head, si_clone) {
1219 KASSERT(dev->si_flags & SI_CLONELIST,
1220 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
1221 u = dev2unit(dev);
1222 if (u == (unit | extra)) {
1223 *dp = dev;
1224 dev_unlock();
1225 devfs_free(ndev);
1226 return (0);
1227 }
1228 if (unit == -1 && u == low) {
1229 low++;
1230 de = dev;
1231 continue;
1232 } else if (u < (unit | extra)) {
1233 de = dev;
1234 continue;
1235 } else if (u > (unit | extra)) {
1236 dl = dev;
1237 break;
1238 }
1239 }
1240 if (unit == -1)
1241 unit = low & CLONE_UNITMASK;
1242 dev = newdev(csw, unit | extra, ndev);
1243 if (dev->si_flags & SI_CLONELIST) {
1244 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name);
1245 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra);
1246 LIST_FOREACH(dev, &cd->head, si_clone) {
1247 printf("\t%p %s\n", dev, dev->si_name);
1248 }
1249 panic("foo");
1250 }
1251 KASSERT(!(dev->si_flags & SI_CLONELIST),
1252 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name));
1253 if (dl != NULL)
1254 LIST_INSERT_BEFORE(dl, dev, si_clone);
1255 else if (de != NULL)
1256 LIST_INSERT_AFTER(de, dev, si_clone);
1257 else
1258 LIST_INSERT_HEAD(&cd->head, dev, si_clone);
1259 dev->si_flags |= SI_CLONELIST;
1260 *up = unit;
1261 dev_unlock_and_free();
1262 return (1);
1263 }
1264
1265 /*
1266 * Kill everything still on the list. The driver should already have
1267 * disposed of any softc hung of the struct cdev *'s at this time.
1268 */
1269 void
1270 clone_cleanup(struct clonedevs **cdp)
1271 {
1272 struct cdev *dev;
1273 struct cdev_priv *cp;
1274 struct clonedevs *cd;
1275
1276 cd = *cdp;
1277 if (cd == NULL)
1278 return;
1279 dev_lock();
1280 while (!LIST_EMPTY(&cd->head)) {
1281 dev = LIST_FIRST(&cd->head);
1282 LIST_REMOVE(dev, si_clone);
1283 KASSERT(dev->si_flags & SI_CLONELIST,
1284 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
1285 dev->si_flags &= ~SI_CLONELIST;
1286 cp = cdev2priv(dev);
1287 if (!(cp->cdp_flags & CDP_SCHED_DTR)) {
1288 cp->cdp_flags |= CDP_SCHED_DTR;
1289 KASSERT(dev->si_flags & SI_NAMED,
1290 ("Driver has goofed in cloning underways udev %x unit %x", dev2udev(dev), dev2unit(dev)));
1291 destroy_devl(dev);
1292 }
1293 }
1294 dev_unlock_and_free();
1295 free(cd, M_DEVBUF);
1296 *cdp = NULL;
1297 }
1298
1299 static TAILQ_HEAD(, cdev_priv) dev_ddtr =
1300 TAILQ_HEAD_INITIALIZER(dev_ddtr);
1301 static struct task dev_dtr_task;
1302
1303 static void
1304 destroy_dev_tq(void *ctx, int pending)
1305 {
1306 struct cdev_priv *cp;
1307 struct cdev *dev;
1308 void (*cb)(void *);
1309 void *cb_arg;
1310
1311 dev_lock();
1312 while (!TAILQ_EMPTY(&dev_ddtr)) {
1313 cp = TAILQ_FIRST(&dev_ddtr);
1314 dev = &cp->cdp_c;
1315 KASSERT(cp->cdp_flags & CDP_SCHED_DTR,
1316 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp));
1317 TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list);
1318 cb = cp->cdp_dtr_cb;
1319 cb_arg = cp->cdp_dtr_cb_arg;
1320 destroy_devl(dev);
1321 dev_unlock_and_free();
1322 dev_rel(dev);
1323 if (cb != NULL)
1324 cb(cb_arg);
1325 dev_lock();
1326 }
1327 dev_unlock();
1328 }
1329
1330 /*
1331 * devmtx shall be locked on entry. devmtx will be unlocked after
1332 * function return.
1333 */
1334 static int
1335 destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg)
1336 {
1337 struct cdev_priv *cp;
1338
1339 mtx_assert(&devmtx, MA_OWNED);
1340 cp = cdev2priv(dev);
1341 if (cp->cdp_flags & CDP_SCHED_DTR) {
1342 dev_unlock();
1343 return (0);
1344 }
1345 dev_refl(dev);
1346 cp->cdp_flags |= CDP_SCHED_DTR;
1347 cp->cdp_dtr_cb = cb;
1348 cp->cdp_dtr_cb_arg = arg;
1349 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list);
1350 dev_unlock();
1351 taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task);
1352 return (1);
1353 }
1354
1355 int
1356 destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg)
1357 {
1358
1359 dev_lock();
1360 return (destroy_dev_sched_cbl(dev, cb, arg));
1361 }
1362
1363 int
1364 destroy_dev_sched(struct cdev *dev)
1365 {
1366
1367 return (destroy_dev_sched_cb(dev, NULL, NULL));
1368 }
1369
1370 void
1371 destroy_dev_drain(struct cdevsw *csw)
1372 {
1373
1374 dev_lock();
1375 while (!LIST_EMPTY(&csw->d_devs)) {
1376 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10);
1377 }
1378 dev_unlock();
1379 }
1380
1381 void
1382 drain_dev_clone_events(void)
1383 {
1384
1385 sx_xlock(&clone_drain_lock);
1386 sx_xunlock(&clone_drain_lock);
1387 }
1388
1389 static void
1390 devdtr_init(void *dummy __unused)
1391 {
1392
1393 TASK_INIT(&dev_dtr_task, 0, destroy_dev_tq, NULL);
1394 }
1395
1396 SYSINIT(devdtr, SI_SUB_DEVFS, SI_ORDER_SECOND, devdtr_init, NULL);
1397
1398 #include "opt_ddb.h"
1399 #ifdef DDB
1400 #include <sys/kernel.h>
1401
1402 #include <ddb/ddb.h>
1403
1404 DB_SHOW_COMMAND(cdev, db_show_cdev)
1405 {
1406 struct cdev_priv *cdp;
1407 struct cdev *dev;
1408 u_int flags;
1409 char buf[512];
1410
1411 if (!have_addr) {
1412 TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) {
1413 dev = &cdp->cdp_c;
1414 db_printf("%s %p\n", dev->si_name, dev);
1415 if (db_pager_quit)
1416 break;
1417 }
1418 return;
1419 }
1420
1421 dev = (struct cdev *)addr;
1422 cdp = cdev2priv(dev);
1423 db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n",
1424 dev->si_name, dev->si_refcount, dev->si_usecount,
1425 dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first);
1426 db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n",
1427 dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2);
1428 flags = dev->si_flags;
1429 #define SI_FLAG(flag) do { \
1430 if (flags & (flag)) { \
1431 if (buf[0] != '\0') \
1432 strlcat(buf, ", ", sizeof(buf)); \
1433 strlcat(buf, (#flag) + 3, sizeof(buf)); \
1434 flags &= ~(flag); \
1435 } \
1436 } while (0)
1437 buf[0] = '\0';
1438 SI_FLAG(SI_ETERNAL);
1439 SI_FLAG(SI_ALIAS);
1440 SI_FLAG(SI_NAMED);
1441 SI_FLAG(SI_CHEAPCLONE);
1442 SI_FLAG(SI_CHILD);
1443 SI_FLAG(SI_DEVOPEN);
1444 SI_FLAG(SI_CONSOPEN);
1445 SI_FLAG(SI_DUMPDEV);
1446 SI_FLAG(SI_CANDELETE);
1447 SI_FLAG(SI_CLONELIST);
1448 db_printf("si_flags %s\n", buf);
1449
1450 flags = cdp->cdp_flags;
1451 #define CDP_FLAG(flag) do { \
1452 if (flags & (flag)) { \
1453 if (buf[0] != '\0') \
1454 strlcat(buf, ", ", sizeof(buf)); \
1455 strlcat(buf, (#flag) + 4, sizeof(buf)); \
1456 flags &= ~(flag); \
1457 } \
1458 } while (0)
1459 buf[0] = '\0';
1460 CDP_FLAG(CDP_ACTIVE);
1461 CDP_FLAG(CDP_SCHED_DTR);
1462 db_printf("cdp_flags %s\n", buf);
1463 }
1464 #endif
Cache object: 276cc7d9b9b2e996016151424d15d9ec
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