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 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,
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);
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
81 dev_unlock_and_free(void)
83 struct cdev_priv_list cdp_free;
84 struct free_cdevsw csw_free;
85 struct cdev_priv *cdp;
88 mtx_assert(&devmtx, MA_OWNED);
91 * Make the local copy of the list heads while the dev_mtx is
92 * held. Free it later.
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);
101 while ((cdp = TAILQ_FIRST(&cdp_free)) != NULL) {
102 TAILQ_REMOVE(&cdp_free, cdp, cdp_list);
103 devfs_free(&cdp->cdp_c);
105 while ((csw = SLIST_FIRST(&csw_free)) != NULL) {
106 SLIST_REMOVE_HEAD(&csw_free, d_postfree_list);
112 dev_free_devlocked(struct cdev *cdev)
114 struct cdev_priv *cdp;
116 mtx_assert(&devmtx, MA_OWNED);
117 cdp = cdev2priv(cdev);
118 TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list);
122 cdevsw_free_devlocked(struct cdevsw *csw)
125 mtx_assert(&devmtx, MA_OWNED);
126 SLIST_INSERT_HEAD(&cdevsw_gt_post_list, csw, d_postfree_list);
137 dev_ref(struct cdev *dev)
140 mtx_assert(&devmtx, MA_NOTOWNED);
147 dev_refl(struct cdev *dev)
150 mtx_assert(&devmtx, MA_OWNED);
155 dev_rel(struct cdev *dev)
159 mtx_assert(&devmtx, MA_NOTOWNED);
162 KASSERT(dev->si_refcount >= 0,
163 ("dev_rel(%s) gave negative count", devtoname(dev)));
165 if (dev->si_usecount == 0 &&
166 (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED))
170 if (dev->si_devsw == NULL && dev->si_refcount == 0) {
171 LIST_REMOVE(dev, si_list);
180 dev_refthread(struct cdev *dev)
183 struct cdev_priv *cdp;
185 mtx_assert(&devmtx, MA_NOTOWNED);
189 cdp = cdev2priv(dev);
190 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0)
191 dev->si_threadcount++;
200 devvn_refthread(struct vnode *vp, struct cdev **devp)
203 struct cdev_priv *cdp;
205 mtx_assert(&devmtx, MA_NOTOWNED);
210 cdp = cdev2priv(*devp);
211 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) {
212 csw = (*devp)->si_devsw;
214 (*devp)->si_threadcount++;
222 dev_relthread(struct cdev *dev)
225 mtx_assert(&devmtx, MA_NOTOWNED);
227 KASSERT(dev->si_threadcount > 0,
228 ("%s threadcount is wrong", dev->si_name));
229 dev->si_threadcount--;
259 /* Define a dead_cdevsw for use when devices leave unexpectedly. */
261 #define dead_open (d_open_t *)enxio
262 #define dead_close (d_close_t *)enxio
263 #define dead_read (d_read_t *)enxio
264 #define dead_write (d_write_t *)enxio
265 #define dead_ioctl (d_ioctl_t *)enxio
266 #define dead_poll (d_poll_t *)enodev
267 #define dead_mmap (d_mmap_t *)enodev
270 dead_strategy(struct bio *bp)
273 biofinish(bp, NULL, ENXIO);
276 #define dead_dump (dumper_t *)enxio
277 #define dead_kqfilter (d_kqfilter_t *)enxio
278 #define dead_mmap_single (d_mmap_single_t *)enodev
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,
294 .d_mmap_single = dead_mmap_single
297 /* Default methods if driver does not specify method */
299 #define null_open (d_open_t *)nullop
300 #define null_close (d_close_t *)nullop
301 #define no_read (d_read_t *)enodev
302 #define no_write (d_write_t *)enodev
303 #define no_ioctl (d_ioctl_t *)enodev
304 #define no_mmap (d_mmap2_t *)enodev
305 #define no_kqfilter (d_kqfilter_t *)enodev
306 #define no_mmap_single (d_mmap_single_t *)enodev
309 no_strategy(struct bio *bp)
312 biofinish(bp, NULL, ENODEV);
316 no_poll(struct cdev *dev __unused, int events, struct thread *td __unused)
319 return (poll_no_poll(events));
322 #define no_dump (dumper_t *)enodev
325 giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
330 dsw = dev_refthread(dev);
334 retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td);
341 giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp)
346 dsw = dev_refthread(dev);
350 retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp);
357 giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
362 dsw = dev_refthread(dev);
366 retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td);
373 giant_strategy(struct bio *bp)
379 dsw = dev_refthread(dev);
381 biofinish(bp, NULL, ENXIO);
385 dsw->d_gianttrick->d_strategy(bp);
391 giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
396 dsw = dev_refthread(dev);
400 retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td);
407 giant_read(struct cdev *dev, struct uio *uio, int ioflag)
412 dsw = dev_refthread(dev);
416 retval = dsw->d_gianttrick->d_read(dev, uio, ioflag);
423 giant_write(struct cdev *dev, struct uio *uio, int ioflag)
428 dsw = dev_refthread(dev);
432 retval = dsw->d_gianttrick->d_write(dev, uio, ioflag);
439 giant_poll(struct cdev *dev, int events, struct thread *td)
444 dsw = dev_refthread(dev);
448 retval = dsw->d_gianttrick->d_poll(dev, events, td);
455 giant_kqfilter(struct cdev *dev, struct knote *kn)
460 dsw = dev_refthread(dev);
464 retval = dsw->d_gianttrick->d_kqfilter(dev, kn);
471 giant_mmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot,
472 vm_memattr_t *memattr)
477 dsw = dev_refthread(dev);
481 if (dsw->d_gianttrick->d_flags & D_MMAP2)
482 retval = dsw->d_gianttrick->d_mmap2(dev, offset, paddr, nprot,
485 retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot);
492 giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size,
493 vm_object_t *object, int nprot)
498 dsw = dev_refthread(dev);
502 retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object,
510 notify(struct cdev *dev, const char *ev, int flags)
512 static const char prefix[] = "cdev=";
518 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK;
519 namelen = strlen(dev->si_name);
520 data = malloc(namelen + sizeof(prefix), M_TEMP, mflags);
523 memcpy(data, prefix, sizeof(prefix) - 1);
524 memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1);
525 devctl_notify_f("DEVFS", "CDEV", ev, data, mflags);
530 notify_create(struct cdev *dev, int flags)
533 notify(dev, "CREATE", flags);
537 notify_destroy(struct cdev *dev)
540 notify(dev, "DESTROY", MAKEDEV_WAITOK);
544 newdev(struct cdevsw *csw, int unit, struct cdev *si)
548 mtx_assert(&devmtx, MA_OWNED);
549 if (csw->d_flags & D_NEEDMINOR) {
550 /* We may want to return an existing device */
551 LIST_FOREACH(si2, &csw->d_devs, si_list) {
552 if (dev2unit(si2) == unit) {
553 dev_free_devlocked(si);
560 LIST_INSERT_HEAD(&csw->d_devs, si, si_list);
565 fini_cdevsw(struct cdevsw *devsw)
569 if (devsw->d_gianttrick != NULL) {
570 gt = devsw->d_gianttrick;
571 memcpy(devsw, gt, sizeof *devsw);
572 cdevsw_free_devlocked(gt);
573 devsw->d_gianttrick = NULL;
575 devsw->d_flags &= ~D_INIT;
579 prep_cdevsw(struct cdevsw *devsw, int flags)
583 mtx_assert(&devmtx, MA_OWNED);
584 if (devsw->d_flags & D_INIT)
586 if (devsw->d_flags & D_NEEDGIANT) {
588 dsw2 = malloc(sizeof *dsw2, M_DEVT,
589 (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK);
591 if (dsw2 == NULL && !(devsw->d_flags & D_INIT))
595 if (devsw->d_flags & D_INIT) {
597 cdevsw_free_devlocked(dsw2);
601 if (devsw->d_version != D_VERSION_01 &&
602 devsw->d_version != D_VERSION_02) {
604 "WARNING: Device driver \"%s\" has wrong version %s\n",
605 devsw->d_name == NULL ? "???" : devsw->d_name,
606 "and is disabled. Recompile KLD module.");
607 devsw->d_open = dead_open;
608 devsw->d_close = dead_close;
609 devsw->d_read = dead_read;
610 devsw->d_write = dead_write;
611 devsw->d_ioctl = dead_ioctl;
612 devsw->d_poll = dead_poll;
613 devsw->d_mmap = dead_mmap;
614 devsw->d_strategy = dead_strategy;
615 devsw->d_dump = dead_dump;
616 devsw->d_kqfilter = dead_kqfilter;
618 if (devsw->d_version == D_VERSION_01)
619 devsw->d_mmap_single = NULL;
621 if (devsw->d_flags & D_NEEDGIANT) {
622 if (devsw->d_gianttrick == NULL) {
623 memcpy(dsw2, devsw, sizeof *dsw2);
624 devsw->d_gianttrick = dsw2;
625 devsw->d_flags |= D_MMAP2;
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_mmap2, no_mmap, giant_mmap);
647 FIXUP(d_strategy, no_strategy, giant_strategy);
648 FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter);
649 FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single);
651 if (devsw->d_dump == NULL) devsw->d_dump = no_dump;
653 LIST_INIT(&devsw->d_devs);
655 devsw->d_flags |= D_INIT;
658 cdevsw_free_devlocked(dsw2);
663 make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit,
664 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt,
670 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0,
671 ("make_dev_credv: both WAITOK and NOWAIT specified"));
672 dev = devfs_alloc(flags);
676 res = prep_cdevsw(devsw, flags);
682 dev = newdev(devsw, unit, dev);
683 if (flags & MAKEDEV_REF)
685 if (dev->si_flags & SI_CHEAPCLONE &&
686 dev->si_flags & SI_NAMED) {
688 * This is allowed as it removes races and generally
689 * simplifies cloning devices.
692 dev_unlock_and_free();
696 KASSERT(!(dev->si_flags & SI_NAMED),
697 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)",
698 devsw->d_name, dev2unit(dev), devtoname(dev)));
700 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
701 if (i > (sizeof dev->__si_namebuf - 1)) {
702 printf("WARNING: Device name truncated! (%s)\n",
706 dev->si_flags |= SI_NAMED;
708 dev->si_cred = crhold(cr);
714 clean_unrhdrl(devfs_inos);
715 dev_unlock_and_free();
717 notify_create(dev, flags);
724 make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode,
725 const char *fmt, ...)
732 res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt,
735 KASSERT(res == 0 && dev != NULL, ("make_dev: failed make_dev_credv"));
740 make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid,
741 gid_t gid, int mode, const char *fmt, ...)
748 res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap);
751 KASSERT(res == 0 && dev != NULL,
752 ("make_dev_cred: failed make_dev_credv"));
757 make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr,
758 uid_t uid, gid_t gid, int mode, const char *fmt, ...)
765 res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode,
769 KASSERT((flags & MAKEDEV_NOWAIT) != 0 || res == 0,
770 ("make_dev_credf: failed make_dev_credv"));
771 return (res == 0 ? dev : NULL);
775 make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw,
776 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...)
782 res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode,
786 KASSERT((flags & MAKEDEV_NOWAIT) != 0 || res == 0,
787 ("make_dev_p: failed make_dev_credv"));
792 dev_dependsl(struct cdev *pdev, struct cdev *cdev)
795 cdev->si_parent = pdev;
796 cdev->si_flags |= SI_CHILD;
797 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
802 dev_depends(struct cdev *pdev, struct cdev *cdev)
806 dev_dependsl(pdev, cdev);
811 make_dev_alias(struct cdev *pdev, const char *fmt, ...)
817 KASSERT(pdev != NULL, ("NULL pdev"));
818 dev = devfs_alloc(MAKEDEV_WAITOK);
820 dev->si_flags |= SI_ALIAS;
821 dev->si_flags |= SI_NAMED;
823 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
824 if (i > (sizeof dev->__si_namebuf - 1)) {
825 printf("WARNING: Device name truncated! (%s)\n",
831 dev_dependsl(pdev, dev);
832 clean_unrhdrl(devfs_inos);
835 notify_create(dev, MAKEDEV_WAITOK);
841 destroy_devl(struct cdev *dev)
844 struct cdev_privdata *p, *p1;
846 mtx_assert(&devmtx, MA_OWNED);
847 KASSERT(dev->si_flags & SI_NAMED,
848 ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev)));
852 /* Remove name marking */
853 dev->si_flags &= ~SI_NAMED;
855 /* If we are a child, remove us from the parents list */
856 if (dev->si_flags & SI_CHILD) {
857 LIST_REMOVE(dev, si_siblings);
858 dev->si_flags &= ~SI_CHILD;
861 /* Kill our children */
862 while (!LIST_EMPTY(&dev->si_children))
863 destroy_devl(LIST_FIRST(&dev->si_children));
865 /* Remove from clone list */
866 if (dev->si_flags & SI_CLONELIST) {
867 LIST_REMOVE(dev, si_clone);
868 dev->si_flags &= ~SI_CLONELIST;
871 dev->si_refcount++; /* Avoid race with dev_rel() */
873 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */
874 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) {
876 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10);
877 if (dev->si_threadcount)
878 printf("Still %lu threads in %s\n",
879 dev->si_threadcount, devtoname(dev));
881 while (dev->si_threadcount != 0) {
882 /* Use unique dummy wait ident */
883 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10);
888 mtx_lock(&cdevpriv_mtx);
889 LIST_FOREACH_SAFE(p, &cdev2priv(dev)->cdp_fdpriv, cdpd_list, p1) {
890 devfs_destroy_cdevpriv(p);
891 mtx_lock(&cdevpriv_mtx);
893 mtx_unlock(&cdevpriv_mtx);
898 bzero(&dev->__si_u, sizeof(dev->__si_u));
900 if (!(dev->si_flags & SI_ALIAS)) {
901 /* Remove from cdevsw list */
902 LIST_REMOVE(dev, si_list);
904 /* If cdevsw has no more struct cdev *'s, clean it */
905 if (LIST_EMPTY(&csw->d_devs)) {
907 wakeup(&csw->d_devs);
910 dev->si_flags &= ~SI_ALIAS;
911 dev->si_refcount--; /* Avoid race with dev_rel() */
913 if (dev->si_refcount > 0) {
914 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
916 dev_free_devlocked(dev);
921 destroy_dev(struct cdev *dev)
924 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev");
927 dev_unlock_and_free();
931 devtoname(struct cdev *dev)
934 return (dev->si_name);
938 dev_stdclone(char *name, char **namep, const char *stem, int *unit)
943 if (bcmp(stem, name, i) != 0)
945 if (!isdigit(name[i]))
948 if (name[i] == '0' && isdigit(name[i+1]))
950 while (isdigit(name[i])) {
952 u += name[i++] - '0';
965 * Helper functions for cloning device drivers.
967 * The objective here is to make it unnecessary for the device drivers to
968 * use rman or similar to manage their unit number space. Due to the way
969 * we do "on-demand" devices, using rman or other "private" methods
970 * will be very tricky to lock down properly once we lock down this file.
972 * Instead we give the drivers these routines which puts the struct cdev *'s
973 * that are to be managed on their own list, and gives the driver the ability
974 * to ask for the first free unit number or a given specified unit number.
976 * In addition these routines support paired devices (pty, nmdm and similar)
977 * by respecting a number of "flag" bits in the minor number.
982 LIST_HEAD(,cdev) head;
986 clone_setup(struct clonedevs **cdp)
989 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO);
990 LIST_INIT(&(*cdp)->head);
994 clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up,
995 struct cdev **dp, int extra)
997 struct clonedevs *cd;
998 struct cdev *dev, *ndev, *dl, *de;
1001 KASSERT(*cdp != NULL,
1002 ("clone_setup() not called in driver \"%s\"", csw->d_name));
1003 KASSERT(!(extra & CLONE_UNITMASK),
1004 ("Illegal extra bits (0x%x) in clone_create", extra));
1005 KASSERT(*up <= CLONE_UNITMASK,
1006 ("Too high unit (0x%x) in clone_create", *up));
1007 KASSERT(csw->d_flags & D_NEEDMINOR,
1008 ("clone_create() on cdevsw without minor numbers"));
1012 * Search the list for a lot of things in one go:
1013 * A preexisting match is returned immediately.
1014 * The lowest free unit number if we are passed -1, and the place
1015 * in the list where we should insert that new element.
1016 * The place to insert a specified unit number, if applicable
1017 * the end of the list.
1020 ndev = devfs_alloc(MAKEDEV_WAITOK);
1022 prep_cdevsw(csw, MAKEDEV_WAITOK);
1026 LIST_FOREACH(dev, &cd->head, si_clone) {
1027 KASSERT(dev->si_flags & SI_CLONELIST,
1028 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
1030 if (u == (unit | extra)) {
1036 if (unit == -1 && u == low) {
1040 } else if (u < (unit | extra)) {
1043 } else if (u > (unit | extra)) {
1049 unit = low & CLONE_UNITMASK;
1050 dev = newdev(csw, unit | extra, ndev);
1051 if (dev->si_flags & SI_CLONELIST) {
1052 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name);
1053 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra);
1054 LIST_FOREACH(dev, &cd->head, si_clone) {
1055 printf("\t%p %s\n", dev, dev->si_name);
1059 KASSERT(!(dev->si_flags & SI_CLONELIST),
1060 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name));
1062 LIST_INSERT_BEFORE(dl, dev, si_clone);
1063 else if (de != NULL)
1064 LIST_INSERT_AFTER(de, dev, si_clone);
1066 LIST_INSERT_HEAD(&cd->head, dev, si_clone);
1067 dev->si_flags |= SI_CLONELIST;
1069 dev_unlock_and_free();
1074 * Kill everything still on the list. The driver should already have
1075 * disposed of any softc hung of the struct cdev *'s at this time.
1078 clone_cleanup(struct clonedevs **cdp)
1081 struct cdev_priv *cp;
1082 struct clonedevs *cd;
1088 while (!LIST_EMPTY(&cd->head)) {
1089 dev = LIST_FIRST(&cd->head);
1090 LIST_REMOVE(dev, si_clone);
1091 KASSERT(dev->si_flags & SI_CLONELIST,
1092 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
1093 dev->si_flags &= ~SI_CLONELIST;
1094 cp = cdev2priv(dev);
1095 if (!(cp->cdp_flags & CDP_SCHED_DTR)) {
1096 cp->cdp_flags |= CDP_SCHED_DTR;
1097 KASSERT(dev->si_flags & SI_NAMED,
1098 ("Driver has goofed in cloning underways udev %x unit %x", dev2udev(dev), dev2unit(dev)));
1102 dev_unlock_and_free();
1107 static TAILQ_HEAD(, cdev_priv) dev_ddtr =
1108 TAILQ_HEAD_INITIALIZER(dev_ddtr);
1109 static struct task dev_dtr_task;
1112 destroy_dev_tq(void *ctx, int pending)
1114 struct cdev_priv *cp;
1120 while (!TAILQ_EMPTY(&dev_ddtr)) {
1121 cp = TAILQ_FIRST(&dev_ddtr);
1123 KASSERT(cp->cdp_flags & CDP_SCHED_DTR,
1124 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp));
1125 TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list);
1126 cb = cp->cdp_dtr_cb;
1127 cb_arg = cp->cdp_dtr_cb_arg;
1129 dev_unlock_and_free();
1139 * devmtx shall be locked on entry. devmtx will be unlocked after
1143 destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg)
1145 struct cdev_priv *cp;
1147 mtx_assert(&devmtx, MA_OWNED);
1148 cp = cdev2priv(dev);
1149 if (cp->cdp_flags & CDP_SCHED_DTR) {
1154 cp->cdp_flags |= CDP_SCHED_DTR;
1155 cp->cdp_dtr_cb = cb;
1156 cp->cdp_dtr_cb_arg = arg;
1157 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list);
1159 taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task);
1164 destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg)
1168 return (destroy_dev_sched_cbl(dev, cb, arg));
1172 destroy_dev_sched(struct cdev *dev)
1175 return (destroy_dev_sched_cb(dev, NULL, NULL));
1179 destroy_dev_drain(struct cdevsw *csw)
1183 while (!LIST_EMPTY(&csw->d_devs)) {
1184 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10);
1190 drain_dev_clone_events(void)
1193 sx_xlock(&clone_drain_lock);
1194 sx_xunlock(&clone_drain_lock);
1198 devdtr_init(void *dummy __unused)
1201 TASK_INIT(&dev_dtr_task, 0, destroy_dev_tq, NULL);
1204 SYSINIT(devdtr, SI_SUB_DEVFS, SI_ORDER_SECOND, devdtr_init, NULL);