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);
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
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 true for read/write. If the user asked for something
318 * special, return POLLNVAL, so that clients have a way of
319 * determining reliably whether or not the extended
320 * functionality is present without hard-coding knowledge
321 * of specific filesystem implementations.
322 * Stay in sync with vop_nopoll().
324 if (events & ~POLLSTANDARD)
327 return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
330 #define no_dump (dumper_t *)enodev
333 giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
338 dsw = dev_refthread(dev);
342 retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td);
349 giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp)
354 dsw = dev_refthread(dev);
358 retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp);
365 giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
370 dsw = dev_refthread(dev);
374 retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td);
381 giant_strategy(struct bio *bp)
387 dsw = dev_refthread(dev);
389 biofinish(bp, NULL, ENXIO);
393 dsw->d_gianttrick->d_strategy(bp);
399 giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
404 dsw = dev_refthread(dev);
408 retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td);
415 giant_read(struct cdev *dev, struct uio *uio, int ioflag)
420 dsw = dev_refthread(dev);
424 retval = dsw->d_gianttrick->d_read(dev, uio, ioflag);
431 giant_write(struct cdev *dev, struct uio *uio, int ioflag)
436 dsw = dev_refthread(dev);
440 retval = dsw->d_gianttrick->d_write(dev, uio, ioflag);
447 giant_poll(struct cdev *dev, int events, struct thread *td)
452 dsw = dev_refthread(dev);
456 retval = dsw->d_gianttrick->d_poll(dev, events, td);
463 giant_kqfilter(struct cdev *dev, struct knote *kn)
468 dsw = dev_refthread(dev);
472 retval = dsw->d_gianttrick->d_kqfilter(dev, kn);
479 giant_mmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot)
484 dsw = dev_refthread(dev);
488 retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot);
496 notify(struct cdev *dev, const char *ev)
498 static const char prefix[] = "cdev=";
504 namelen = strlen(dev->si_name);
505 data = malloc(namelen + sizeof(prefix), M_TEMP, M_WAITOK);
506 memcpy(data, prefix, sizeof(prefix) - 1);
507 memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1);
508 devctl_notify("DEVFS", "CDEV", ev, data);
513 notify_create(struct cdev *dev)
516 notify(dev, "CREATE");
520 notify_destroy(struct cdev *dev)
523 notify(dev, "DESTROY");
527 newdev(struct cdevsw *csw, int y, struct cdev *si)
532 mtx_assert(&devmtx, MA_OWNED);
534 if (csw->d_flags & D_NEEDMINOR) {
535 /* We may want to return an existing device */
536 LIST_FOREACH(si2, &csw->d_devs, si_list) {
537 if (si2->si_drv0 == udev) {
538 dev_free_devlocked(si);
545 LIST_INSERT_HEAD(&csw->d_devs, si, si_list);
549 #define UMINORMASK 0xffff00ffU
554 return (dev & UMINORMASK);
560 return ((dev & ~UMINORMASK) >> 8);
564 fini_cdevsw(struct cdevsw *devsw)
568 if (devsw->d_gianttrick != NULL) {
569 gt = devsw->d_gianttrick;
570 memcpy(devsw, gt, sizeof *devsw);
571 cdevsw_free_devlocked(gt);
572 devsw->d_gianttrick = NULL;
574 devsw->d_flags &= ~D_INIT;
578 prep_cdevsw(struct cdevsw *devsw)
582 mtx_assert(&devmtx, MA_OWNED);
583 if (devsw->d_flags & D_INIT)
585 if (devsw->d_flags & D_NEEDGIANT) {
587 dsw2 = malloc(sizeof *dsw2, M_DEVT, M_WAITOK);
591 if (devsw->d_flags & D_INIT) {
593 cdevsw_free_devlocked(dsw2);
597 if (devsw->d_version != D_VERSION_01) {
599 "WARNING: Device driver \"%s\" has wrong version %s\n",
600 devsw->d_name == NULL ? "???" : devsw->d_name,
601 "and is disabled. Recompile KLD module.");
602 devsw->d_open = dead_open;
603 devsw->d_close = dead_close;
604 devsw->d_read = dead_read;
605 devsw->d_write = dead_write;
606 devsw->d_ioctl = dead_ioctl;
607 devsw->d_poll = dead_poll;
608 devsw->d_mmap = dead_mmap;
609 devsw->d_strategy = dead_strategy;
610 devsw->d_dump = dead_dump;
611 devsw->d_kqfilter = dead_kqfilter;
614 if (devsw->d_flags & D_TTY) {
615 if (devsw->d_ioctl == NULL) devsw->d_ioctl = ttyioctl;
616 if (devsw->d_read == NULL) devsw->d_read = ttyread;
617 if (devsw->d_write == NULL) devsw->d_write = ttywrite;
618 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = ttykqfilter;
619 if (devsw->d_poll == NULL) devsw->d_poll = ttypoll;
622 if (devsw->d_flags & D_NEEDGIANT) {
623 if (devsw->d_gianttrick == NULL) {
624 memcpy(dsw2, devsw, sizeof *dsw2);
625 devsw->d_gianttrick = dsw2;
630 #define FIXUP(member, noop, giant) \
632 if (devsw->member == NULL) { \
633 devsw->member = noop; \
634 } else if (devsw->d_flags & D_NEEDGIANT) \
635 devsw->member = giant; \
639 FIXUP(d_open, null_open, giant_open);
640 FIXUP(d_fdopen, NULL, giant_fdopen);
641 FIXUP(d_close, null_close, giant_close);
642 FIXUP(d_read, no_read, giant_read);
643 FIXUP(d_write, no_write, giant_write);
644 FIXUP(d_ioctl, no_ioctl, giant_ioctl);
645 FIXUP(d_poll, no_poll, giant_poll);
646 FIXUP(d_mmap, no_mmap, giant_mmap);
647 FIXUP(d_strategy, no_strategy, giant_strategy);
648 FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter);
650 if (devsw->d_dump == NULL) devsw->d_dump = no_dump;
652 LIST_INIT(&devsw->d_devs);
654 devsw->d_flags |= D_INIT;
657 cdevsw_free_devlocked(dsw2);
661 make_dev_credv(int flags, struct cdevsw *devsw, int minornr,
662 struct ucred *cr, uid_t uid,
663 gid_t gid, int mode, const char *fmt, va_list ap)
671 dev = newdev(devsw, minornr, dev);
672 if (flags & MAKEDEV_REF)
674 if (dev->si_flags & SI_CHEAPCLONE &&
675 dev->si_flags & SI_NAMED) {
677 * This is allowed as it removes races and generally
678 * simplifies cloning devices.
681 dev_unlock_and_free();
684 KASSERT(!(dev->si_flags & SI_NAMED),
685 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)",
686 devsw->d_name, minor(dev), devtoname(dev)));
688 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
689 if (i > (sizeof dev->__si_namebuf - 1)) {
690 printf("WARNING: Device name truncated! (%s)\n",
694 dev->si_flags |= SI_NAMED;
697 dev->si_cred = crhold(cr);
706 clean_unrhdrl(devfs_inos);
707 dev_unlock_and_free();
715 make_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int mode,
716 const char *fmt, ...)
722 dev = make_dev_credv(0, devsw, minornr, NULL, uid, gid, mode, fmt, ap);
728 make_dev_cred(struct cdevsw *devsw, int minornr, struct ucred *cr, uid_t uid,
729 gid_t gid, int mode, const char *fmt, ...)
735 dev = make_dev_credv(0, devsw, minornr, cr, uid, gid, mode, fmt, ap);
742 make_dev_credf(int flags, struct cdevsw *devsw, int minornr,
743 struct ucred *cr, uid_t uid,
744 gid_t gid, int mode, const char *fmt, ...)
750 dev = make_dev_credv(flags, devsw, minornr, cr, uid, gid, mode,
758 dev_dependsl(struct cdev *pdev, struct cdev *cdev)
761 cdev->si_parent = pdev;
762 cdev->si_flags |= SI_CHILD;
763 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
768 dev_depends(struct cdev *pdev, struct cdev *cdev)
772 dev_dependsl(pdev, cdev);
777 make_dev_alias(struct cdev *pdev, const char *fmt, ...)
785 dev->si_flags |= SI_ALIAS;
786 dev->si_flags |= SI_NAMED;
788 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
789 if (i > (sizeof dev->__si_namebuf - 1)) {
790 printf("WARNING: Device name truncated! (%s)\n",
796 clean_unrhdrl(devfs_inos);
798 dev_depends(pdev, dev);
806 destroy_devl(struct cdev *dev)
809 struct cdev_privdata *p, *p1;
811 mtx_assert(&devmtx, MA_OWNED);
812 KASSERT(dev->si_flags & SI_NAMED,
813 ("WARNING: Driver mistake: destroy_dev on %d\n", minor(dev)));
817 /* Remove name marking */
818 dev->si_flags &= ~SI_NAMED;
820 /* If we are a child, remove us from the parents list */
821 if (dev->si_flags & SI_CHILD) {
822 LIST_REMOVE(dev, si_siblings);
823 dev->si_flags &= ~SI_CHILD;
826 /* Kill our children */
827 while (!LIST_EMPTY(&dev->si_children))
828 destroy_devl(LIST_FIRST(&dev->si_children));
830 /* Remove from clone list */
831 if (dev->si_flags & SI_CLONELIST) {
832 LIST_REMOVE(dev, si_clone);
833 dev->si_flags &= ~SI_CLONELIST;
836 dev->si_refcount++; /* Avoid race with dev_rel() */
838 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */
839 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) {
841 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10);
842 if (dev->si_threadcount)
843 printf("Still %lu threads in %s\n",
844 dev->si_threadcount, devtoname(dev));
846 while (dev->si_threadcount != 0) {
847 /* Use unique dummy wait ident */
848 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10);
853 mtx_lock(&cdevpriv_mtx);
854 LIST_FOREACH_SAFE(p, &cdev2priv(dev)->cdp_fdpriv, cdpd_list, p1) {
855 devfs_destroy_cdevpriv(p);
856 mtx_lock(&cdevpriv_mtx);
858 mtx_unlock(&cdevpriv_mtx);
863 bzero(&dev->__si_u, sizeof(dev->__si_u));
865 if (!(dev->si_flags & SI_ALIAS)) {
866 /* Remove from cdevsw list */
867 LIST_REMOVE(dev, si_list);
869 /* If cdevsw has no more struct cdev *'s, clean it */
870 if (LIST_EMPTY(&csw->d_devs)) {
872 wakeup(&csw->d_devs);
875 dev->si_flags &= ~SI_ALIAS;
876 dev->si_refcount--; /* Avoid race with dev_rel() */
878 if (dev->si_refcount > 0) {
879 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
881 dev_free_devlocked(dev);
886 destroy_dev(struct cdev *dev)
891 dev_unlock_and_free();
895 devtoname(struct cdev *dev)
901 if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') {
903 csw = dev_refthread(dev);
905 sprintf(p, "(%s)", csw->d_name);
910 if (mynor < 0 || mynor > 255)
911 sprintf(p, "/%#x", (u_int)mynor);
913 sprintf(p, "/%d", mynor);
915 return (dev->si_name);
919 dev_stdclone(char *name, char **namep, const char *stem, int *unit)
924 if (bcmp(stem, name, i) != 0)
926 if (!isdigit(name[i]))
929 if (name[i] == '0' && isdigit(name[i+1]))
931 while (isdigit(name[i])) {
933 u += name[i++] - '0';
946 * Helper functions for cloning device drivers.
948 * The objective here is to make it unnecessary for the device drivers to
949 * use rman or similar to manage their unit number space. Due to the way
950 * we do "on-demand" devices, using rman or other "private" methods
951 * will be very tricky to lock down properly once we lock down this file.
953 * Instead we give the drivers these routines which puts the struct cdev *'s
954 * that are to be managed on their own list, and gives the driver the ability
955 * to ask for the first free unit number or a given specified unit number.
957 * In addition these routines support paired devices (pty, nmdm and similar)
958 * by respecting a number of "flag" bits in the minor number.
963 LIST_HEAD(,cdev) head;
967 clone_setup(struct clonedevs **cdp)
970 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO);
971 LIST_INIT(&(*cdp)->head);
975 clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, struct cdev **dp, int extra)
977 struct clonedevs *cd;
978 struct cdev *dev, *ndev, *dl, *de;
981 KASSERT(*cdp != NULL,
982 ("clone_setup() not called in driver \"%s\"", csw->d_name));
983 KASSERT(!(extra & CLONE_UNITMASK),
984 ("Illegal extra bits (0x%x) in clone_create", extra));
985 KASSERT(*up <= CLONE_UNITMASK,
986 ("Too high unit (0x%x) in clone_create", *up));
987 KASSERT(csw->d_flags & D_NEEDMINOR,
988 ("clone_create() on cdevsw without minor numbers"));
992 * Search the list for a lot of things in one go:
993 * A preexisting match is returned immediately.
994 * The lowest free unit number if we are passed -1, and the place
995 * in the list where we should insert that new element.
996 * The place to insert a specified unit number, if applicable
997 * the end of the list.
1000 ndev = devfs_alloc();
1006 LIST_FOREACH(dev, &cd->head, si_clone) {
1007 KASSERT(dev->si_flags & SI_CLONELIST,
1008 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
1010 if (u == (unit | extra)) {
1016 if (unit == -1 && u == low) {
1020 } else if (u < (unit | extra)) {
1023 } else if (u > (unit | extra)) {
1029 unit = low & CLONE_UNITMASK;
1030 dev = newdev(csw, unit2minor(unit | extra), ndev);
1031 if (dev->si_flags & SI_CLONELIST) {
1032 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name);
1033 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra);
1034 LIST_FOREACH(dev, &cd->head, si_clone) {
1035 printf("\t%p %s\n", dev, dev->si_name);
1039 KASSERT(!(dev->si_flags & SI_CLONELIST),
1040 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name));
1042 LIST_INSERT_BEFORE(dl, dev, si_clone);
1043 else if (de != NULL)
1044 LIST_INSERT_AFTER(de, dev, si_clone);
1046 LIST_INSERT_HEAD(&cd->head, dev, si_clone);
1047 dev->si_flags |= SI_CLONELIST;
1049 dev_unlock_and_free();
1054 * Kill everything still on the list. The driver should already have
1055 * disposed of any softc hung of the struct cdev *'s at this time.
1058 clone_cleanup(struct clonedevs **cdp)
1061 struct cdev_priv *cp;
1062 struct clonedevs *cd;
1068 while (!LIST_EMPTY(&cd->head)) {
1069 dev = LIST_FIRST(&cd->head);
1070 LIST_REMOVE(dev, si_clone);
1071 KASSERT(dev->si_flags & SI_CLONELIST,
1072 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
1073 dev->si_flags &= ~SI_CLONELIST;
1074 cp = cdev2priv(dev);
1075 if (!(cp->cdp_flags & CDP_SCHED_DTR)) {
1076 cp->cdp_flags |= CDP_SCHED_DTR;
1077 KASSERT(dev->si_flags & SI_NAMED,
1078 ("Driver has goofed in cloning underways udev %x", dev->si_drv0));
1082 dev_unlock_and_free();
1087 static TAILQ_HEAD(, cdev_priv) dev_ddtr =
1088 TAILQ_HEAD_INITIALIZER(dev_ddtr);
1089 static struct task dev_dtr_task;
1092 destroy_dev_tq(void *ctx, int pending)
1094 struct cdev_priv *cp;
1100 while (!TAILQ_EMPTY(&dev_ddtr)) {
1101 cp = TAILQ_FIRST(&dev_ddtr);
1103 KASSERT(cp->cdp_flags & CDP_SCHED_DTR,
1104 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp));
1105 TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list);
1106 cb = cp->cdp_dtr_cb;
1107 cb_arg = cp->cdp_dtr_cb_arg;
1109 dev_unlock_and_free();
1119 * devmtx shall be locked on entry. devmtx will be unlocked after
1123 destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg)
1125 struct cdev_priv *cp;
1127 mtx_assert(&devmtx, MA_OWNED);
1128 cp = cdev2priv(dev);
1129 if (cp->cdp_flags & CDP_SCHED_DTR) {
1134 cp->cdp_flags |= CDP_SCHED_DTR;
1135 cp->cdp_dtr_cb = cb;
1136 cp->cdp_dtr_cb_arg = arg;
1137 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list);
1139 taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task);
1144 destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg)
1147 return (destroy_dev_sched_cbl(dev, cb, arg));
1151 destroy_dev_sched(struct cdev *dev)
1153 return (destroy_dev_sched_cb(dev, NULL, NULL));
1157 destroy_dev_drain(struct cdevsw *csw)
1161 while (!LIST_EMPTY(&csw->d_devs)) {
1162 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10);
1168 drain_dev_clone_events(void)
1171 sx_xlock(&clone_drain_lock);
1172 sx_xunlock(&clone_drain_lock);
1176 devdtr_init(void *dummy __unused)
1179 TASK_INIT(&dev_dtr_task, 0, destroy_dev_tq, NULL);
1182 SYSINIT(devdtr, SI_SUB_DEVFS, SI_ORDER_SECOND, devdtr_init, NULL);