2 * Copyright (c) 1999-2002 Poul-Henning Kamp
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/kernel.h>
32 #include <sys/systm.h>
36 #include <sys/mutex.h>
37 #include <sys/module.h>
38 #include <sys/malloc.h>
40 #include <sys/vnode.h>
41 #include <sys/queue.h>
44 #include <sys/ctype.h>
45 #include <sys/ucred.h>
46 #include <sys/taskqueue.h>
47 #include <machine/stdarg.h>
49 #include <fs/devfs/devfs_int.h>
52 static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage");
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 struct cdev *make_dev_credv(int flags,
59 struct cdevsw *devsw, int unit,
60 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt,
63 static struct cdev_priv_list cdevp_free_list =
64 TAILQ_HEAD_INITIALIZER(cdevp_free_list);
65 static SLIST_HEAD(free_cdevsw, cdevsw) cdevsw_gt_post_list =
66 SLIST_HEAD_INITIALIZER();
76 * Free all the memory collected while the cdev mutex was
77 * locked. Since devmtx is after the system map mutex, free() cannot
78 * be called immediately and is postponed until cdev mutex can be
82 dev_unlock_and_free(void)
84 struct cdev_priv_list cdp_free;
85 struct free_cdevsw csw_free;
86 struct cdev_priv *cdp;
89 mtx_assert(&devmtx, MA_OWNED);
92 * Make the local copy of the list heads while the dev_mtx is
93 * held. Free it later.
95 TAILQ_INIT(&cdp_free);
96 TAILQ_CONCAT(&cdp_free, &cdevp_free_list, cdp_list);
97 csw_free = cdevsw_gt_post_list;
98 SLIST_INIT(&cdevsw_gt_post_list);
102 while ((cdp = TAILQ_FIRST(&cdp_free)) != NULL) {
103 TAILQ_REMOVE(&cdp_free, cdp, cdp_list);
104 devfs_free(&cdp->cdp_c);
106 while ((csw = SLIST_FIRST(&csw_free)) != NULL) {
107 SLIST_REMOVE_HEAD(&csw_free, d_postfree_list);
113 dev_free_devlocked(struct cdev *cdev)
115 struct cdev_priv *cdp;
117 mtx_assert(&devmtx, MA_OWNED);
118 cdp = cdev2priv(cdev);
119 TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list);
123 cdevsw_free_devlocked(struct cdevsw *csw)
126 mtx_assert(&devmtx, MA_OWNED);
127 SLIST_INSERT_HEAD(&cdevsw_gt_post_list, csw, d_postfree_list);
138 dev_ref(struct cdev *dev)
141 mtx_assert(&devmtx, MA_NOTOWNED);
148 dev_refl(struct cdev *dev)
151 mtx_assert(&devmtx, MA_OWNED);
156 dev_rel(struct cdev *dev)
160 mtx_assert(&devmtx, MA_NOTOWNED);
163 KASSERT(dev->si_refcount >= 0,
164 ("dev_rel(%s) gave negative count", devtoname(dev)));
166 if (dev->si_usecount == 0 &&
167 (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED))
171 if (dev->si_devsw == NULL && dev->si_refcount == 0) {
172 LIST_REMOVE(dev, si_list);
181 dev_refthread(struct cdev *dev)
184 struct cdev_priv *cdp;
186 mtx_assert(&devmtx, MA_NOTOWNED);
190 cdp = cdev2priv(dev);
191 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0)
192 dev->si_threadcount++;
201 devvn_refthread(struct vnode *vp, struct cdev **devp)
204 struct cdev_priv *cdp;
206 mtx_assert(&devmtx, MA_NOTOWNED);
211 cdp = cdev2priv(*devp);
212 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) {
213 csw = (*devp)->si_devsw;
215 (*devp)->si_threadcount++;
223 dev_relthread(struct cdev *dev)
226 mtx_assert(&devmtx, MA_NOTOWNED);
228 KASSERT(dev->si_threadcount > 0,
229 ("%s threadcount is wrong", dev->si_name));
230 dev->si_threadcount--;
260 /* Define a dead_cdevsw for use when devices leave unexpectedly. */
262 #define dead_open (d_open_t *)enxio
263 #define dead_close (d_close_t *)enxio
264 #define dead_read (d_read_t *)enxio
265 #define dead_write (d_write_t *)enxio
266 #define dead_ioctl (d_ioctl_t *)enxio
267 #define dead_poll (d_poll_t *)enodev
268 #define dead_mmap (d_mmap_t *)enodev
271 dead_strategy(struct bio *bp)
274 biofinish(bp, NULL, ENXIO);
277 #define dead_dump (dumper_t *)enxio
278 #define dead_kqfilter (d_kqfilter_t *)enxio
279 #define dead_mmap_single (d_mmap_single_t *)enodev
281 static struct cdevsw dead_cdevsw = {
282 .d_version = D_VERSION,
283 .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */
285 .d_close = dead_close,
287 .d_write = dead_write,
288 .d_ioctl = dead_ioctl,
291 .d_strategy = dead_strategy,
294 .d_kqfilter = dead_kqfilter,
295 .d_mmap_single = dead_mmap_single
298 /* Default methods if driver does not specify method */
300 #define null_open (d_open_t *)nullop
301 #define null_close (d_close_t *)nullop
302 #define no_read (d_read_t *)enodev
303 #define no_write (d_write_t *)enodev
304 #define no_ioctl (d_ioctl_t *)enodev
305 #define no_mmap (d_mmap_t *)enodev
306 #define no_kqfilter (d_kqfilter_t *)enodev
307 #define no_mmap_single (d_mmap_single_t *)enodev
310 no_strategy(struct bio *bp)
313 biofinish(bp, NULL, ENODEV);
317 no_poll(struct cdev *dev __unused, int events, struct thread *td __unused)
320 return (poll_no_poll(events));
323 #define no_dump (dumper_t *)enodev
326 giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
331 dsw = dev_refthread(dev);
335 retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td);
342 giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp)
347 dsw = dev_refthread(dev);
351 retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp);
358 giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
363 dsw = dev_refthread(dev);
367 retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td);
374 giant_strategy(struct bio *bp)
380 dsw = dev_refthread(dev);
382 biofinish(bp, NULL, ENXIO);
386 dsw->d_gianttrick->d_strategy(bp);
392 giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
397 dsw = dev_refthread(dev);
401 retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td);
408 giant_read(struct cdev *dev, struct uio *uio, int ioflag)
413 dsw = dev_refthread(dev);
417 retval = dsw->d_gianttrick->d_read(dev, uio, ioflag);
424 giant_write(struct cdev *dev, struct uio *uio, int ioflag)
429 dsw = dev_refthread(dev);
433 retval = dsw->d_gianttrick->d_write(dev, uio, ioflag);
440 giant_poll(struct cdev *dev, int events, struct thread *td)
445 dsw = dev_refthread(dev);
449 retval = dsw->d_gianttrick->d_poll(dev, events, td);
456 giant_kqfilter(struct cdev *dev, struct knote *kn)
461 dsw = dev_refthread(dev);
465 retval = dsw->d_gianttrick->d_kqfilter(dev, kn);
472 giant_mmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot)
477 dsw = dev_refthread(dev);
481 retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot);
488 giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size,
489 vm_object_t *object, int nprot)
494 dsw = dev_refthread(dev);
498 retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object,
506 notify(struct cdev *dev, const char *ev)
508 static const char prefix[] = "cdev=";
514 namelen = strlen(dev->si_name);
515 data = malloc(namelen + sizeof(prefix), M_TEMP, M_NOWAIT);
518 memcpy(data, prefix, sizeof(prefix) - 1);
519 memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1);
520 devctl_notify("DEVFS", "CDEV", ev, data);
525 notify_create(struct cdev *dev)
528 notify(dev, "CREATE");
532 notify_destroy(struct cdev *dev)
535 notify(dev, "DESTROY");
539 newdev(struct cdevsw *csw, int unit, struct cdev *si)
543 mtx_assert(&devmtx, MA_OWNED);
544 if (csw->d_flags & D_NEEDMINOR) {
545 /* We may want to return an existing device */
546 LIST_FOREACH(si2, &csw->d_devs, si_list) {
547 if (dev2unit(si2) == unit) {
548 dev_free_devlocked(si);
555 LIST_INSERT_HEAD(&csw->d_devs, si, si_list);
560 fini_cdevsw(struct cdevsw *devsw)
564 if (devsw->d_gianttrick != NULL) {
565 gt = devsw->d_gianttrick;
566 memcpy(devsw, gt, sizeof *devsw);
567 cdevsw_free_devlocked(gt);
568 devsw->d_gianttrick = NULL;
570 devsw->d_flags &= ~D_INIT;
574 prep_cdevsw(struct cdevsw *devsw)
578 mtx_assert(&devmtx, MA_OWNED);
579 if (devsw->d_flags & D_INIT)
581 if (devsw->d_flags & D_NEEDGIANT) {
583 dsw2 = malloc(sizeof *dsw2, M_DEVT, M_WAITOK);
587 if (devsw->d_flags & D_INIT) {
589 cdevsw_free_devlocked(dsw2);
593 if (devsw->d_version != D_VERSION_01 &&
594 devsw->d_version != D_VERSION_02) {
596 "WARNING: Device driver \"%s\" has wrong version %s\n",
597 devsw->d_name == NULL ? "???" : devsw->d_name,
598 "and is disabled. Recompile KLD module.");
599 devsw->d_open = dead_open;
600 devsw->d_close = dead_close;
601 devsw->d_read = dead_read;
602 devsw->d_write = dead_write;
603 devsw->d_ioctl = dead_ioctl;
604 devsw->d_poll = dead_poll;
605 devsw->d_mmap = dead_mmap;
606 devsw->d_strategy = dead_strategy;
607 devsw->d_dump = dead_dump;
608 devsw->d_kqfilter = dead_kqfilter;
610 if (devsw->d_version == D_VERSION_01)
611 devsw->d_mmap_single = NULL;
613 if (devsw->d_flags & D_NEEDGIANT) {
614 if (devsw->d_gianttrick == NULL) {
615 memcpy(dsw2, devsw, sizeof *dsw2);
616 devsw->d_gianttrick = dsw2;
621 #define FIXUP(member, noop, giant) \
623 if (devsw->member == NULL) { \
624 devsw->member = noop; \
625 } else if (devsw->d_flags & D_NEEDGIANT) \
626 devsw->member = giant; \
630 FIXUP(d_open, null_open, giant_open);
631 FIXUP(d_fdopen, NULL, giant_fdopen);
632 FIXUP(d_close, null_close, giant_close);
633 FIXUP(d_read, no_read, giant_read);
634 FIXUP(d_write, no_write, giant_write);
635 FIXUP(d_ioctl, no_ioctl, giant_ioctl);
636 FIXUP(d_poll, no_poll, giant_poll);
637 FIXUP(d_mmap, no_mmap, giant_mmap);
638 FIXUP(d_strategy, no_strategy, giant_strategy);
639 FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter);
640 FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single);
642 if (devsw->d_dump == NULL) devsw->d_dump = no_dump;
644 LIST_INIT(&devsw->d_devs);
646 devsw->d_flags |= D_INIT;
649 cdevsw_free_devlocked(dsw2);
653 make_dev_credv(int flags, struct cdevsw *devsw, int unit,
654 struct ucred *cr, uid_t uid,
655 gid_t gid, int mode, const char *fmt, va_list ap)
663 dev = newdev(devsw, unit, dev);
664 if (flags & MAKEDEV_REF)
666 if (dev->si_flags & SI_CHEAPCLONE &&
667 dev->si_flags & SI_NAMED) {
669 * This is allowed as it removes races and generally
670 * simplifies cloning devices.
673 dev_unlock_and_free();
676 KASSERT(!(dev->si_flags & SI_NAMED),
677 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)",
678 devsw->d_name, dev2unit(dev), devtoname(dev)));
680 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
681 if (i > (sizeof dev->__si_namebuf - 1)) {
682 printf("WARNING: Device name truncated! (%s)\n",
686 dev->si_flags |= SI_NAMED;
688 dev->si_cred = crhold(cr);
696 clean_unrhdrl(devfs_inos);
697 dev_unlock_and_free();
705 make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode,
706 const char *fmt, ...)
712 dev = make_dev_credv(0, devsw, unit, NULL, uid, gid, mode, fmt, ap);
718 make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid,
719 gid_t gid, int mode, const char *fmt, ...)
725 dev = make_dev_credv(0, devsw, unit, cr, uid, gid, mode, fmt, ap);
732 make_dev_credf(int flags, struct cdevsw *devsw, int unit,
733 struct ucred *cr, uid_t uid,
734 gid_t gid, int mode, const char *fmt, ...)
740 dev = make_dev_credv(flags, devsw, unit, cr, uid, gid, mode,
748 dev_dependsl(struct cdev *pdev, struct cdev *cdev)
751 cdev->si_parent = pdev;
752 cdev->si_flags |= SI_CHILD;
753 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
758 dev_depends(struct cdev *pdev, struct cdev *cdev)
762 dev_dependsl(pdev, cdev);
767 make_dev_alias(struct cdev *pdev, const char *fmt, ...)
773 KASSERT(pdev != NULL, ("NULL pdev"));
776 dev->si_flags |= SI_ALIAS;
777 dev->si_flags |= SI_NAMED;
779 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
780 if (i > (sizeof dev->__si_namebuf - 1)) {
781 printf("WARNING: Device name truncated! (%s)\n",
787 dev_dependsl(pdev, dev);
788 clean_unrhdrl(devfs_inos);
797 destroy_devl(struct cdev *dev)
800 struct cdev_privdata *p, *p1;
802 mtx_assert(&devmtx, MA_OWNED);
803 KASSERT(dev->si_flags & SI_NAMED,
804 ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev)));
808 /* Remove name marking */
809 dev->si_flags &= ~SI_NAMED;
811 /* If we are a child, remove us from the parents list */
812 if (dev->si_flags & SI_CHILD) {
813 LIST_REMOVE(dev, si_siblings);
814 dev->si_flags &= ~SI_CHILD;
817 /* Kill our children */
818 while (!LIST_EMPTY(&dev->si_children))
819 destroy_devl(LIST_FIRST(&dev->si_children));
821 /* Remove from clone list */
822 if (dev->si_flags & SI_CLONELIST) {
823 LIST_REMOVE(dev, si_clone);
824 dev->si_flags &= ~SI_CLONELIST;
827 dev->si_refcount++; /* Avoid race with dev_rel() */
829 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */
830 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) {
832 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10);
833 if (dev->si_threadcount)
834 printf("Still %lu threads in %s\n",
835 dev->si_threadcount, devtoname(dev));
837 while (dev->si_threadcount != 0) {
838 /* Use unique dummy wait ident */
839 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10);
844 mtx_lock(&cdevpriv_mtx);
845 LIST_FOREACH_SAFE(p, &cdev2priv(dev)->cdp_fdpriv, cdpd_list, p1) {
846 devfs_destroy_cdevpriv(p);
847 mtx_lock(&cdevpriv_mtx);
849 mtx_unlock(&cdevpriv_mtx);
854 bzero(&dev->__si_u, sizeof(dev->__si_u));
856 if (!(dev->si_flags & SI_ALIAS)) {
857 /* Remove from cdevsw list */
858 LIST_REMOVE(dev, si_list);
860 /* If cdevsw has no more struct cdev *'s, clean it */
861 if (LIST_EMPTY(&csw->d_devs)) {
863 wakeup(&csw->d_devs);
866 dev->si_flags &= ~SI_ALIAS;
867 dev->si_refcount--; /* Avoid race with dev_rel() */
869 if (dev->si_refcount > 0) {
870 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
872 dev_free_devlocked(dev);
877 destroy_dev(struct cdev *dev)
880 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev");
883 dev_unlock_and_free();
887 devtoname(struct cdev *dev)
890 return (dev->si_name);
894 dev_stdclone(char *name, char **namep, const char *stem, int *unit)
899 if (bcmp(stem, name, i) != 0)
901 if (!isdigit(name[i]))
904 if (name[i] == '0' && isdigit(name[i+1]))
906 while (isdigit(name[i])) {
908 u += name[i++] - '0';
921 * Helper functions for cloning device drivers.
923 * The objective here is to make it unnecessary for the device drivers to
924 * use rman or similar to manage their unit number space. Due to the way
925 * we do "on-demand" devices, using rman or other "private" methods
926 * will be very tricky to lock down properly once we lock down this file.
928 * Instead we give the drivers these routines which puts the struct cdev *'s
929 * that are to be managed on their own list, and gives the driver the ability
930 * to ask for the first free unit number or a given specified unit number.
932 * In addition these routines support paired devices (pty, nmdm and similar)
933 * by respecting a number of "flag" bits in the minor number.
938 LIST_HEAD(,cdev) head;
942 clone_setup(struct clonedevs **cdp)
945 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO);
946 LIST_INIT(&(*cdp)->head);
950 clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, struct cdev **dp, int extra)
952 struct clonedevs *cd;
953 struct cdev *dev, *ndev, *dl, *de;
956 KASSERT(*cdp != NULL,
957 ("clone_setup() not called in driver \"%s\"", csw->d_name));
958 KASSERT(!(extra & CLONE_UNITMASK),
959 ("Illegal extra bits (0x%x) in clone_create", extra));
960 KASSERT(*up <= CLONE_UNITMASK,
961 ("Too high unit (0x%x) in clone_create", *up));
962 KASSERT(csw->d_flags & D_NEEDMINOR,
963 ("clone_create() on cdevsw without minor numbers"));
967 * Search the list for a lot of things in one go:
968 * A preexisting match is returned immediately.
969 * The lowest free unit number if we are passed -1, and the place
970 * in the list where we should insert that new element.
971 * The place to insert a specified unit number, if applicable
972 * the end of the list.
975 ndev = devfs_alloc();
981 LIST_FOREACH(dev, &cd->head, si_clone) {
982 KASSERT(dev->si_flags & SI_CLONELIST,
983 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
985 if (u == (unit | extra)) {
991 if (unit == -1 && u == low) {
995 } else if (u < (unit | extra)) {
998 } else if (u > (unit | extra)) {
1004 unit = low & CLONE_UNITMASK;
1005 dev = newdev(csw, unit | extra, ndev);
1006 if (dev->si_flags & SI_CLONELIST) {
1007 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name);
1008 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra);
1009 LIST_FOREACH(dev, &cd->head, si_clone) {
1010 printf("\t%p %s\n", dev, dev->si_name);
1014 KASSERT(!(dev->si_flags & SI_CLONELIST),
1015 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name));
1017 LIST_INSERT_BEFORE(dl, dev, si_clone);
1018 else if (de != NULL)
1019 LIST_INSERT_AFTER(de, dev, si_clone);
1021 LIST_INSERT_HEAD(&cd->head, dev, si_clone);
1022 dev->si_flags |= SI_CLONELIST;
1024 dev_unlock_and_free();
1029 * Kill everything still on the list. The driver should already have
1030 * disposed of any softc hung of the struct cdev *'s at this time.
1033 clone_cleanup(struct clonedevs **cdp)
1036 struct cdev_priv *cp;
1037 struct clonedevs *cd;
1043 while (!LIST_EMPTY(&cd->head)) {
1044 dev = LIST_FIRST(&cd->head);
1045 LIST_REMOVE(dev, si_clone);
1046 KASSERT(dev->si_flags & SI_CLONELIST,
1047 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
1048 dev->si_flags &= ~SI_CLONELIST;
1049 cp = cdev2priv(dev);
1050 if (!(cp->cdp_flags & CDP_SCHED_DTR)) {
1051 cp->cdp_flags |= CDP_SCHED_DTR;
1052 KASSERT(dev->si_flags & SI_NAMED,
1053 ("Driver has goofed in cloning underways udev %x unit %x", dev2udev(dev), dev2unit(dev)));
1057 dev_unlock_and_free();
1062 static TAILQ_HEAD(, cdev_priv) dev_ddtr =
1063 TAILQ_HEAD_INITIALIZER(dev_ddtr);
1064 static struct task dev_dtr_task;
1067 destroy_dev_tq(void *ctx, int pending)
1069 struct cdev_priv *cp;
1075 while (!TAILQ_EMPTY(&dev_ddtr)) {
1076 cp = TAILQ_FIRST(&dev_ddtr);
1078 KASSERT(cp->cdp_flags & CDP_SCHED_DTR,
1079 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp));
1080 TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list);
1081 cb = cp->cdp_dtr_cb;
1082 cb_arg = cp->cdp_dtr_cb_arg;
1084 dev_unlock_and_free();
1094 * devmtx shall be locked on entry. devmtx will be unlocked after
1098 destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg)
1100 struct cdev_priv *cp;
1102 mtx_assert(&devmtx, MA_OWNED);
1103 cp = cdev2priv(dev);
1104 if (cp->cdp_flags & CDP_SCHED_DTR) {
1109 cp->cdp_flags |= CDP_SCHED_DTR;
1110 cp->cdp_dtr_cb = cb;
1111 cp->cdp_dtr_cb_arg = arg;
1112 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list);
1114 taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task);
1119 destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg)
1122 return (destroy_dev_sched_cbl(dev, cb, arg));
1126 destroy_dev_sched(struct cdev *dev)
1128 return (destroy_dev_sched_cb(dev, NULL, NULL));
1132 destroy_dev_drain(struct cdevsw *csw)
1136 while (!LIST_EMPTY(&csw->d_devs)) {
1137 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10);
1143 drain_dev_clone_events(void)
1146 sx_xlock(&clone_drain_lock);
1147 sx_xunlock(&clone_drain_lock);
1151 devdtr_init(void *dummy __unused)
1154 TASK_INIT(&dev_dtr_task, 0, destroy_dev_tq, NULL);
1157 SYSINIT(devdtr, SI_SUB_DEVFS, SI_ORDER_SECOND, devdtr_init, NULL);