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>
46 #include <sys/ucred.h>
47 #include <sys/taskqueue.h>
48 #include <machine/stdarg.h>
50 #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 minornr,
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);
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);
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 = (*devp)->si_priv;
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
280 static struct cdevsw dead_cdevsw = {
281 .d_version = D_VERSION,
282 .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */
284 .d_close = dead_close,
286 .d_write = dead_write,
287 .d_ioctl = dead_ioctl,
290 .d_strategy = dead_strategy,
293 .d_kqfilter = dead_kqfilter
296 /* Default methods if driver does not specify method */
298 #define null_open (d_open_t *)nullop
299 #define null_close (d_close_t *)nullop
300 #define no_read (d_read_t *)enodev
301 #define no_write (d_write_t *)enodev
302 #define no_ioctl (d_ioctl_t *)enodev
303 #define no_mmap (d_mmap_t *)enodev
304 #define no_kqfilter (d_kqfilter_t *)enodev
307 no_strategy(struct bio *bp)
310 biofinish(bp, NULL, ENODEV);
314 no_poll(struct cdev *dev __unused, int events, struct thread *td __unused)
317 return (poll_no_poll(events));
320 #define no_dump (dumper_t *)enodev
323 giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
328 dsw = dev_refthread(dev);
332 retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td);
339 giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp)
344 dsw = dev_refthread(dev);
348 retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp);
355 giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
360 dsw = dev_refthread(dev);
364 retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td);
371 giant_strategy(struct bio *bp)
377 dsw = dev_refthread(dev);
379 biofinish(bp, NULL, ENXIO);
383 dsw->d_gianttrick->d_strategy(bp);
389 giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
394 dsw = dev_refthread(dev);
398 retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td);
405 giant_read(struct cdev *dev, struct uio *uio, int ioflag)
410 dsw = dev_refthread(dev);
414 retval = dsw->d_gianttrick->d_read(dev, uio, ioflag);
421 giant_write(struct cdev *dev, struct uio *uio, int ioflag)
426 dsw = dev_refthread(dev);
430 retval = dsw->d_gianttrick->d_write(dev, uio, ioflag);
437 giant_poll(struct cdev *dev, int events, struct thread *td)
442 dsw = dev_refthread(dev);
446 retval = dsw->d_gianttrick->d_poll(dev, events, td);
453 giant_kqfilter(struct cdev *dev, struct knote *kn)
458 dsw = dev_refthread(dev);
462 retval = dsw->d_gianttrick->d_kqfilter(dev, kn);
469 giant_mmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot)
474 dsw = dev_refthread(dev);
478 retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot);
486 * struct cdev * and u_dev_t primitives
490 minor(struct cdev *x)
494 return(x->si_drv0 & MAXMINOR);
498 dev2unit(struct cdev *x)
503 return (minor2unit(minor(x)));
507 minor2unit(u_int _minor)
510 KASSERT((_minor & ~MAXMINOR) == 0, ("Illegal minor %x", _minor));
511 return ((_minor & 0xff) | ((_minor >> 8) & 0xffff00));
518 KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit));
519 return ((unit & 0xff) | ((unit << 8) & ~0xffff));
523 notify(struct cdev *dev, const char *ev)
525 static const char prefix[] = "cdev=";
531 namelen = strlen(dev->si_name);
532 data = malloc(namelen + sizeof(prefix), M_TEMP, M_WAITOK);
533 memcpy(data, prefix, sizeof(prefix) - 1);
534 memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1);
535 devctl_notify("DEVFS", "CDEV", ev, data);
540 notify_create(struct cdev *dev)
543 notify(dev, "CREATE");
547 notify_destroy(struct cdev *dev)
550 notify(dev, "DESTROY");
554 newdev(struct cdevsw *csw, int y, struct cdev *si)
559 mtx_assert(&devmtx, MA_OWNED);
561 LIST_FOREACH(si2, &csw->d_devs, si_list) {
562 if (si2->si_drv0 == udev) {
563 dev_free_devlocked(si);
569 LIST_INSERT_HEAD(&csw->d_devs, si, si_list);
576 return (dev & MAXMINOR);
582 return ((dev & ~MAXMINOR) >> 8);
586 fini_cdevsw(struct cdevsw *devsw)
590 if (devsw->d_gianttrick != NULL) {
591 gt = devsw->d_gianttrick;
592 memcpy(devsw, gt, sizeof *devsw);
593 cdevsw_free_devlocked(gt);
594 devsw->d_gianttrick = NULL;
596 devsw->d_flags &= ~D_INIT;
600 prep_cdevsw(struct cdevsw *devsw)
604 mtx_assert(&devmtx, MA_OWNED);
605 if (devsw->d_flags & D_INIT)
607 if (devsw->d_flags & D_NEEDGIANT) {
609 dsw2 = malloc(sizeof *dsw2, M_DEVT, M_WAITOK);
613 if (devsw->d_flags & D_INIT) {
615 cdevsw_free_devlocked(dsw2);
619 if (devsw->d_version != D_VERSION_01) {
621 "WARNING: Device driver \"%s\" has wrong version %s\n",
622 devsw->d_name == NULL ? "???" : devsw->d_name,
623 "and is disabled. Recompile KLD module.");
624 devsw->d_open = dead_open;
625 devsw->d_close = dead_close;
626 devsw->d_read = dead_read;
627 devsw->d_write = dead_write;
628 devsw->d_ioctl = dead_ioctl;
629 devsw->d_poll = dead_poll;
630 devsw->d_mmap = dead_mmap;
631 devsw->d_strategy = dead_strategy;
632 devsw->d_dump = dead_dump;
633 devsw->d_kqfilter = dead_kqfilter;
636 if (devsw->d_flags & D_TTY) {
637 if (devsw->d_ioctl == NULL) devsw->d_ioctl = ttyioctl;
638 if (devsw->d_read == NULL) devsw->d_read = ttyread;
639 if (devsw->d_write == NULL) devsw->d_write = ttywrite;
640 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = ttykqfilter;
641 if (devsw->d_poll == NULL) devsw->d_poll = ttypoll;
644 if (devsw->d_flags & D_NEEDGIANT) {
645 if (devsw->d_gianttrick == NULL) {
646 memcpy(dsw2, devsw, sizeof *dsw2);
647 devsw->d_gianttrick = dsw2;
652 #define FIXUP(member, noop, giant) \
654 if (devsw->member == NULL) { \
655 devsw->member = noop; \
656 } else if (devsw->d_flags & D_NEEDGIANT) \
657 devsw->member = giant; \
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);
672 if (devsw->d_dump == NULL) devsw->d_dump = no_dump;
674 LIST_INIT(&devsw->d_devs);
676 devsw->d_flags |= D_INIT;
679 cdevsw_free_devlocked(dsw2);
683 make_dev_credv(int flags, struct cdevsw *devsw, int minornr,
684 struct ucred *cr, uid_t uid,
685 gid_t gid, int mode, const char *fmt, va_list ap)
690 KASSERT((minornr & ~MAXMINOR) == 0,
691 ("Invalid minor (0x%x) in make_dev", minornr));
696 dev = newdev(devsw, minornr, dev);
697 if (flags & MAKEDEV_REF)
699 if (dev->si_flags & SI_CHEAPCLONE &&
700 dev->si_flags & SI_NAMED) {
702 * This is allowed as it removes races and generally
703 * simplifies cloning devices.
706 dev_unlock_and_free();
709 KASSERT(!(dev->si_flags & SI_NAMED),
710 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)",
711 devsw->d_name, minor(dev), devtoname(dev)));
713 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
714 if (i > (sizeof dev->__si_namebuf - 1)) {
715 printf("WARNING: Device name truncated! (%s)\n",
719 dev->si_flags |= SI_NAMED;
722 dev->si_cred = crhold(cr);
731 clean_unrhdrl(devfs_inos);
732 dev_unlock_and_free();
740 make_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int mode,
741 const char *fmt, ...)
747 dev = make_dev_credv(0, devsw, minornr, NULL, uid, gid, mode, fmt, ap);
753 make_dev_cred(struct cdevsw *devsw, int minornr, struct ucred *cr, uid_t uid,
754 gid_t gid, int mode, const char *fmt, ...)
760 dev = make_dev_credv(0, devsw, minornr, cr, uid, gid, mode, fmt, ap);
767 make_dev_credf(int flags, struct cdevsw *devsw, int minornr,
768 struct ucred *cr, uid_t uid,
769 gid_t gid, int mode, const char *fmt, ...)
775 dev = make_dev_credv(flags, devsw, minornr, cr, uid, gid, mode,
783 dev_dependsl(struct cdev *pdev, struct cdev *cdev)
786 cdev->si_parent = pdev;
787 cdev->si_flags |= SI_CHILD;
788 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
793 dev_depends(struct cdev *pdev, struct cdev *cdev)
797 dev_dependsl(pdev, cdev);
802 make_dev_alias(struct cdev *pdev, const char *fmt, ...)
808 KASSERT(pdev != NULL, ("NULL pdev"));
811 dev->si_flags |= SI_ALIAS;
812 dev->si_flags |= SI_NAMED;
814 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
815 if (i > (sizeof dev->__si_namebuf - 1)) {
816 printf("WARNING: Device name truncated! (%s)\n",
822 dev_dependsl(pdev, dev);
823 clean_unrhdrl(devfs_inos);
832 destroy_devl(struct cdev *dev)
835 struct cdev_privdata *p, *p1;
837 mtx_assert(&devmtx, MA_OWNED);
838 KASSERT(dev->si_flags & SI_NAMED,
839 ("WARNING: Driver mistake: destroy_dev on %d\n", minor(dev)));
843 /* Remove name marking */
844 dev->si_flags &= ~SI_NAMED;
846 /* If we are a child, remove us from the parents list */
847 if (dev->si_flags & SI_CHILD) {
848 LIST_REMOVE(dev, si_siblings);
849 dev->si_flags &= ~SI_CHILD;
852 /* Kill our children */
853 while (!LIST_EMPTY(&dev->si_children))
854 destroy_devl(LIST_FIRST(&dev->si_children));
856 /* Remove from clone list */
857 if (dev->si_flags & SI_CLONELIST) {
858 LIST_REMOVE(dev, si_clone);
859 dev->si_flags &= ~SI_CLONELIST;
862 dev->si_refcount++; /* Avoid race with dev_rel() */
864 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */
865 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) {
867 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10);
868 if (dev->si_threadcount)
869 printf("Still %lu threads in %s\n",
870 dev->si_threadcount, devtoname(dev));
872 while (dev->si_threadcount != 0) {
873 /* Use unique dummy wait ident */
874 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10);
879 mtx_lock(&cdevpriv_mtx);
880 LIST_FOREACH_SAFE(p, &dev->si_priv->cdp_fdpriv, cdpd_list, p1) {
881 devfs_destroy_cdevpriv(p);
882 mtx_lock(&cdevpriv_mtx);
884 mtx_unlock(&cdevpriv_mtx);
889 bzero(&dev->__si_u, sizeof(dev->__si_u));
891 if (!(dev->si_flags & SI_ALIAS)) {
892 /* Remove from cdevsw list */
893 LIST_REMOVE(dev, si_list);
895 /* If cdevsw has no more struct cdev *'s, clean it */
896 if (LIST_EMPTY(&csw->d_devs)) {
898 wakeup(&csw->d_devs);
901 dev->si_flags &= ~SI_ALIAS;
902 dev->si_refcount--; /* Avoid race with dev_rel() */
904 if (dev->si_refcount > 0) {
905 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
907 dev_free_devlocked(dev);
912 destroy_dev(struct cdev *dev)
917 dev_unlock_and_free();
921 devtoname(struct cdev *dev)
927 if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') {
929 csw = dev_refthread(dev);
931 sprintf(p, "(%s)", csw->d_name);
936 if (mynor < 0 || mynor > 255)
937 sprintf(p, "/%#x", (u_int)mynor);
939 sprintf(p, "/%d", mynor);
941 return (dev->si_name);
945 dev_stdclone(char *name, char **namep, const char *stem, int *unit)
950 if (bcmp(stem, name, i) != 0)
952 if (!isdigit(name[i]))
955 if (name[i] == '0' && isdigit(name[i+1]))
957 while (isdigit(name[i])) {
959 u += name[i++] - '0';
972 * Helper functions for cloning device drivers.
974 * The objective here is to make it unnecessary for the device drivers to
975 * use rman or similar to manage their unit number space. Due to the way
976 * we do "on-demand" devices, using rman or other "private" methods
977 * will be very tricky to lock down properly once we lock down this file.
979 * Instead we give the drivers these routines which puts the struct cdev *'s
980 * that are to be managed on their own list, and gives the driver the ability
981 * to ask for the first free unit number or a given specified unit number.
983 * In addition these routines support paired devices (pty, nmdm and similar)
984 * by respecting a number of "flag" bits in the minor number.
989 LIST_HEAD(,cdev) head;
993 clone_setup(struct clonedevs **cdp)
996 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO);
997 LIST_INIT(&(*cdp)->head);
1001 clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, struct cdev **dp, int extra)
1003 struct clonedevs *cd;
1004 struct cdev *dev, *ndev, *dl, *de;
1007 KASSERT(*cdp != NULL,
1008 ("clone_setup() not called in driver \"%s\"", csw->d_name));
1009 KASSERT(!(extra & CLONE_UNITMASK),
1010 ("Illegal extra bits (0x%x) in clone_create", extra));
1011 KASSERT(*up <= CLONE_UNITMASK,
1012 ("Too high unit (0x%x) in clone_create", *up));
1016 * Search the list for a lot of things in one go:
1017 * A preexisting match is returned immediately.
1018 * The lowest free unit number if we are passed -1, and the place
1019 * in the list where we should insert that new element.
1020 * The place to insert a specified unit number, if applicable
1021 * the end of the list.
1024 ndev = devfs_alloc();
1030 LIST_FOREACH(dev, &cd->head, si_clone) {
1031 KASSERT(dev->si_flags & SI_CLONELIST,
1032 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
1034 if (u == (unit | extra)) {
1040 if (unit == -1 && u == low) {
1044 } else if (u < (unit | extra)) {
1047 } else if (u > (unit | extra)) {
1053 unit = low & CLONE_UNITMASK;
1054 dev = newdev(csw, unit2minor(unit | extra), ndev);
1055 if (dev->si_flags & SI_CLONELIST) {
1056 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name);
1057 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra);
1058 LIST_FOREACH(dev, &cd->head, si_clone) {
1059 printf("\t%p %s\n", dev, dev->si_name);
1063 KASSERT(!(dev->si_flags & SI_CLONELIST),
1064 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name));
1066 LIST_INSERT_BEFORE(dl, dev, si_clone);
1067 else if (de != NULL)
1068 LIST_INSERT_AFTER(de, dev, si_clone);
1070 LIST_INSERT_HEAD(&cd->head, dev, si_clone);
1071 dev->si_flags |= SI_CLONELIST;
1073 dev_unlock_and_free();
1078 * Kill everything still on the list. The driver should already have
1079 * disposed of any softc hung of the struct cdev *'s at this time.
1082 clone_cleanup(struct clonedevs **cdp)
1085 struct cdev_priv *cp;
1086 struct clonedevs *cd;
1092 while (!LIST_EMPTY(&cd->head)) {
1093 dev = LIST_FIRST(&cd->head);
1094 LIST_REMOVE(dev, si_clone);
1095 KASSERT(dev->si_flags & SI_CLONELIST,
1096 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
1097 dev->si_flags &= ~SI_CLONELIST;
1099 if (!(cp->cdp_flags & CDP_SCHED_DTR)) {
1100 cp->cdp_flags |= CDP_SCHED_DTR;
1101 KASSERT(dev->si_flags & SI_NAMED,
1102 ("Driver has goofed in cloning underways udev %x", dev->si_drv0));
1106 dev_unlock_and_free();
1111 static TAILQ_HEAD(, cdev_priv) dev_ddtr =
1112 TAILQ_HEAD_INITIALIZER(dev_ddtr);
1113 static struct task dev_dtr_task;
1116 destroy_dev_tq(void *ctx, int pending)
1118 struct cdev_priv *cp;
1124 while (!TAILQ_EMPTY(&dev_ddtr)) {
1125 cp = TAILQ_FIRST(&dev_ddtr);
1127 KASSERT(cp->cdp_flags & CDP_SCHED_DTR,
1128 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp));
1129 TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list);
1130 cb = cp->cdp_dtr_cb;
1131 cb_arg = cp->cdp_dtr_cb_arg;
1133 dev_unlock_and_free();
1143 * devmtx shall be locked on entry. devmtx will be unlocked after
1147 destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg)
1149 struct cdev_priv *cp;
1151 mtx_assert(&devmtx, MA_OWNED);
1153 if (cp->cdp_flags & CDP_SCHED_DTR) {
1158 cp->cdp_flags |= CDP_SCHED_DTR;
1159 cp->cdp_dtr_cb = cb;
1160 cp->cdp_dtr_cb_arg = arg;
1161 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list);
1163 taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task);
1168 destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg)
1171 return (destroy_dev_sched_cbl(dev, cb, arg));
1175 destroy_dev_sched(struct cdev *dev)
1177 return (destroy_dev_sched_cb(dev, NULL, NULL));
1181 destroy_dev_drain(struct cdevsw *csw)
1185 while (!LIST_EMPTY(&csw->d_devs)) {
1186 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10);
1192 drain_dev_clone_events(void)
1195 sx_xlock(&clone_drain_lock);
1196 sx_xunlock(&clone_drain_lock);
1200 devdtr_init(void *dummy __unused)
1203 TASK_INIT(&dev_dtr_task, 0, destroy_dev_tq, NULL);
1206 SYSINIT(devdtr, SI_SUB_DEVFS, SI_ORDER_SECOND, devdtr_init, NULL);