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, int *ref)
183 struct cdev_priv *cdp;
185 mtx_assert(&devmtx, MA_NOTOWNED);
186 if ((dev->si_flags & SI_ETERNAL) != 0) {
188 return (dev->si_devsw);
193 cdp = cdev2priv(dev);
194 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0)
195 dev->si_threadcount++;
205 devvn_refthread(struct vnode *vp, struct cdev **devp, int *ref)
208 struct cdev_priv *cdp;
211 mtx_assert(&devmtx, MA_NOTOWNED);
212 if ((vp->v_vflag & VV_ETERNALDEV) != 0) {
216 KASSERT((dev->si_flags & SI_ETERNAL) != 0,
217 ("Not eternal cdev"));
220 KASSERT(csw != NULL, ("Eternal cdev is destroyed"));
232 cdp = cdev2priv(dev);
233 if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) {
236 dev->si_threadcount++;
247 dev_relthread(struct cdev *dev, int ref)
250 mtx_assert(&devmtx, MA_NOTOWNED);
254 KASSERT(dev->si_threadcount > 0,
255 ("%s threadcount is wrong", dev->si_name));
256 dev->si_threadcount--;
286 /* Define a dead_cdevsw for use when devices leave unexpectedly. */
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
297 dead_strategy(struct bio *bp)
300 biofinish(bp, NULL, ENXIO);
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
307 static struct cdevsw dead_cdevsw = {
308 .d_version = D_VERSION,
309 .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */
311 .d_close = dead_close,
313 .d_write = dead_write,
314 .d_ioctl = dead_ioctl,
317 .d_strategy = dead_strategy,
320 .d_kqfilter = dead_kqfilter,
321 .d_mmap_single = dead_mmap_single
324 /* Default methods if driver does not specify method */
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_mmap2_t *)enodev
332 #define no_kqfilter (d_kqfilter_t *)enodev
333 #define no_mmap_single (d_mmap_single_t *)enodev
336 no_strategy(struct bio *bp)
339 biofinish(bp, NULL, ENODEV);
343 no_poll(struct cdev *dev __unused, int events, struct thread *td __unused)
346 return (poll_no_poll(events));
349 #define no_dump (dumper_t *)enodev
352 giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
357 dsw = dev_refthread(dev, &ref);
361 retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td);
363 dev_relthread(dev, ref);
368 giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp)
373 dsw = dev_refthread(dev, &ref);
377 retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp);
379 dev_relthread(dev, ref);
384 giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
389 dsw = dev_refthread(dev, &ref);
393 retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td);
395 dev_relthread(dev, ref);
400 giant_strategy(struct bio *bp)
407 dsw = dev_refthread(dev, &ref);
409 biofinish(bp, NULL, ENXIO);
413 dsw->d_gianttrick->d_strategy(bp);
415 dev_relthread(dev, ref);
419 giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
424 dsw = dev_refthread(dev, &ref);
428 retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td);
430 dev_relthread(dev, ref);
435 giant_read(struct cdev *dev, struct uio *uio, int ioflag)
440 dsw = dev_refthread(dev, &ref);
444 retval = dsw->d_gianttrick->d_read(dev, uio, ioflag);
446 dev_relthread(dev, ref);
451 giant_write(struct cdev *dev, struct uio *uio, int ioflag)
456 dsw = dev_refthread(dev, &ref);
460 retval = dsw->d_gianttrick->d_write(dev, uio, ioflag);
462 dev_relthread(dev, ref);
467 giant_poll(struct cdev *dev, int events, struct thread *td)
472 dsw = dev_refthread(dev, &ref);
476 retval = dsw->d_gianttrick->d_poll(dev, events, td);
478 dev_relthread(dev, ref);
483 giant_kqfilter(struct cdev *dev, struct knote *kn)
488 dsw = dev_refthread(dev, &ref);
492 retval = dsw->d_gianttrick->d_kqfilter(dev, kn);
494 dev_relthread(dev, ref);
499 giant_mmap(struct cdev *dev, vm_offset_t offset, vm_paddr_t *paddr, int nprot,
500 vm_memattr_t *memattr)
505 dsw = dev_refthread(dev, &ref);
509 if (dsw->d_gianttrick->d_flags & D_MMAP2)
510 retval = dsw->d_gianttrick->d_mmap2(dev, offset, paddr, nprot,
513 retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot);
515 dev_relthread(dev, ref);
520 giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size,
521 vm_object_t *object, int nprot)
526 dsw = dev_refthread(dev, &ref);
530 retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object,
533 dev_relthread(dev, ref);
538 notify(struct cdev *dev, const char *ev, int flags)
540 static const char prefix[] = "cdev=";
546 mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK;
547 namelen = strlen(dev->si_name);
548 data = malloc(namelen + sizeof(prefix), M_TEMP, mflags);
551 memcpy(data, prefix, sizeof(prefix) - 1);
552 memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1);
553 devctl_notify_f("DEVFS", "CDEV", ev, data, mflags);
558 notify_create(struct cdev *dev, int flags)
561 notify(dev, "CREATE", flags);
565 notify_destroy(struct cdev *dev)
568 notify(dev, "DESTROY", MAKEDEV_WAITOK);
572 newdev(struct cdevsw *csw, int unit, struct cdev *si)
576 mtx_assert(&devmtx, MA_OWNED);
577 if (csw->d_flags & D_NEEDMINOR) {
578 /* We may want to return an existing device */
579 LIST_FOREACH(si2, &csw->d_devs, si_list) {
580 if (dev2unit(si2) == unit) {
581 dev_free_devlocked(si);
588 LIST_INSERT_HEAD(&csw->d_devs, si, si_list);
593 fini_cdevsw(struct cdevsw *devsw)
597 if (devsw->d_gianttrick != NULL) {
598 gt = devsw->d_gianttrick;
599 memcpy(devsw, gt, sizeof *devsw);
600 cdevsw_free_devlocked(gt);
601 devsw->d_gianttrick = NULL;
603 devsw->d_flags &= ~D_INIT;
607 prep_cdevsw(struct cdevsw *devsw, int flags)
611 mtx_assert(&devmtx, MA_OWNED);
612 if (devsw->d_flags & D_INIT)
614 if (devsw->d_flags & D_NEEDGIANT) {
616 dsw2 = malloc(sizeof *dsw2, M_DEVT,
617 (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK);
619 if (dsw2 == NULL && !(devsw->d_flags & D_INIT))
623 if (devsw->d_flags & D_INIT) {
625 cdevsw_free_devlocked(dsw2);
629 if (devsw->d_version != D_VERSION_01 &&
630 devsw->d_version != D_VERSION_02) {
632 "WARNING: Device driver \"%s\" has wrong version %s\n",
633 devsw->d_name == NULL ? "???" : devsw->d_name,
634 "and is disabled. Recompile KLD module.");
635 devsw->d_open = dead_open;
636 devsw->d_close = dead_close;
637 devsw->d_read = dead_read;
638 devsw->d_write = dead_write;
639 devsw->d_ioctl = dead_ioctl;
640 devsw->d_poll = dead_poll;
641 devsw->d_mmap = dead_mmap;
642 devsw->d_strategy = dead_strategy;
643 devsw->d_dump = dead_dump;
644 devsw->d_kqfilter = dead_kqfilter;
646 if (devsw->d_version == D_VERSION_01)
647 devsw->d_mmap_single = NULL;
649 if (devsw->d_flags & D_NEEDGIANT) {
650 if (devsw->d_gianttrick == NULL) {
651 memcpy(dsw2, devsw, sizeof *dsw2);
652 devsw->d_gianttrick = dsw2;
653 devsw->d_flags |= D_MMAP2;
658 #define FIXUP(member, noop, giant) \
660 if (devsw->member == NULL) { \
661 devsw->member = noop; \
662 } else if (devsw->d_flags & D_NEEDGIANT) \
663 devsw->member = giant; \
667 FIXUP(d_open, null_open, giant_open);
668 FIXUP(d_fdopen, NULL, giant_fdopen);
669 FIXUP(d_close, null_close, giant_close);
670 FIXUP(d_read, no_read, giant_read);
671 FIXUP(d_write, no_write, giant_write);
672 FIXUP(d_ioctl, no_ioctl, giant_ioctl);
673 FIXUP(d_poll, no_poll, giant_poll);
674 FIXUP(d_mmap2, no_mmap, giant_mmap);
675 FIXUP(d_strategy, no_strategy, giant_strategy);
676 FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter);
677 FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single);
679 if (devsw->d_dump == NULL) devsw->d_dump = no_dump;
681 LIST_INIT(&devsw->d_devs);
683 devsw->d_flags |= D_INIT;
686 cdevsw_free_devlocked(dsw2);
691 make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit,
692 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt,
698 KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0,
699 ("make_dev_credv: both WAITOK and NOWAIT specified"));
700 dev = devfs_alloc(flags);
704 res = prep_cdevsw(devsw, flags);
710 dev = newdev(devsw, unit, dev);
711 if (flags & MAKEDEV_REF)
713 if (flags & MAKEDEV_ETERNAL)
714 dev->si_flags |= SI_ETERNAL;
715 if (dev->si_flags & SI_CHEAPCLONE &&
716 dev->si_flags & SI_NAMED) {
718 * This is allowed as it removes races and generally
719 * simplifies cloning devices.
722 dev_unlock_and_free();
726 KASSERT(!(dev->si_flags & SI_NAMED),
727 ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)",
728 devsw->d_name, dev2unit(dev), devtoname(dev)));
730 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
731 if (i > (sizeof dev->__si_namebuf - 1)) {
732 printf("WARNING: Device name truncated! (%s)\n",
736 dev->si_flags |= SI_NAMED;
738 dev->si_cred = crhold(cr);
744 clean_unrhdrl(devfs_inos);
745 dev_unlock_and_free();
747 notify_create(dev, flags);
754 make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode,
755 const char *fmt, ...)
762 res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt,
765 KASSERT(res == 0 && dev != NULL, ("make_dev: failed make_dev_credv"));
770 make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid,
771 gid_t gid, int mode, const char *fmt, ...)
778 res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap);
781 KASSERT(res == 0 && dev != NULL,
782 ("make_dev_cred: failed make_dev_credv"));
787 make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr,
788 uid_t uid, gid_t gid, int mode, const char *fmt, ...)
795 res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode,
799 KASSERT((flags & MAKEDEV_NOWAIT) != 0 || res == 0,
800 ("make_dev_credf: failed make_dev_credv"));
801 return (res == 0 ? dev : NULL);
805 make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw,
806 struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...)
812 res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode,
816 KASSERT((flags & MAKEDEV_NOWAIT) != 0 || res == 0,
817 ("make_dev_p: failed make_dev_credv"));
822 dev_dependsl(struct cdev *pdev, struct cdev *cdev)
825 cdev->si_parent = pdev;
826 cdev->si_flags |= SI_CHILD;
827 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
832 dev_depends(struct cdev *pdev, struct cdev *cdev)
836 dev_dependsl(pdev, cdev);
841 make_dev_alias(struct cdev *pdev, const char *fmt, ...)
847 KASSERT(pdev != NULL, ("NULL pdev"));
848 dev = devfs_alloc(MAKEDEV_WAITOK);
850 dev->si_flags |= SI_ALIAS;
851 dev->si_flags |= SI_NAMED;
853 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
854 if (i > (sizeof dev->__si_namebuf - 1)) {
855 printf("WARNING: Device name truncated! (%s)\n",
861 dev_dependsl(pdev, dev);
862 clean_unrhdrl(devfs_inos);
865 notify_create(dev, MAKEDEV_WAITOK);
871 destroy_devl(struct cdev *dev)
874 struct cdev_privdata *p;
876 mtx_assert(&devmtx, MA_OWNED);
877 KASSERT(dev->si_flags & SI_NAMED,
878 ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev)));
879 KASSERT((dev->si_flags & SI_ETERNAL) == 0,
880 ("WARNING: Driver mistake: destroy_dev on eternal %d\n",
885 /* Remove name marking */
886 dev->si_flags &= ~SI_NAMED;
888 /* If we are a child, remove us from the parents list */
889 if (dev->si_flags & SI_CHILD) {
890 LIST_REMOVE(dev, si_siblings);
891 dev->si_flags &= ~SI_CHILD;
894 /* Kill our children */
895 while (!LIST_EMPTY(&dev->si_children))
896 destroy_devl(LIST_FIRST(&dev->si_children));
898 /* Remove from clone list */
899 if (dev->si_flags & SI_CLONELIST) {
900 LIST_REMOVE(dev, si_clone);
901 dev->si_flags &= ~SI_CLONELIST;
904 dev->si_refcount++; /* Avoid race with dev_rel() */
906 dev->si_devsw = NULL; /* already NULL for SI_ALIAS */
907 while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) {
909 msleep(csw, &devmtx, PRIBIO, "devprg", hz/10);
910 if (dev->si_threadcount)
911 printf("Still %lu threads in %s\n",
912 dev->si_threadcount, devtoname(dev));
914 while (dev->si_threadcount != 0) {
915 /* Use unique dummy wait ident */
916 msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10);
921 mtx_lock(&cdevpriv_mtx);
922 while ((p = LIST_FIRST(&cdev2priv(dev)->cdp_fdpriv)) != NULL) {
923 devfs_destroy_cdevpriv(p);
924 mtx_lock(&cdevpriv_mtx);
926 mtx_unlock(&cdevpriv_mtx);
931 bzero(&dev->__si_u, sizeof(dev->__si_u));
933 if (!(dev->si_flags & SI_ALIAS)) {
934 /* Remove from cdevsw list */
935 LIST_REMOVE(dev, si_list);
937 /* If cdevsw has no more struct cdev *'s, clean it */
938 if (LIST_EMPTY(&csw->d_devs)) {
940 wakeup(&csw->d_devs);
943 dev->si_flags &= ~SI_ALIAS;
944 dev->si_refcount--; /* Avoid race with dev_rel() */
946 if (dev->si_refcount > 0) {
947 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
949 dev_free_devlocked(dev);
954 destroy_dev(struct cdev *dev)
957 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev");
960 dev_unlock_and_free();
964 devtoname(struct cdev *dev)
967 return (dev->si_name);
971 dev_stdclone(char *name, char **namep, const char *stem, int *unit)
976 if (bcmp(stem, name, i) != 0)
978 if (!isdigit(name[i]))
981 if (name[i] == '0' && isdigit(name[i+1]))
983 while (isdigit(name[i])) {
985 u += name[i++] - '0';
998 * Helper functions for cloning device drivers.
1000 * The objective here is to make it unnecessary for the device drivers to
1001 * use rman or similar to manage their unit number space. Due to the way
1002 * we do "on-demand" devices, using rman or other "private" methods
1003 * will be very tricky to lock down properly once we lock down this file.
1005 * Instead we give the drivers these routines which puts the struct cdev *'s
1006 * that are to be managed on their own list, and gives the driver the ability
1007 * to ask for the first free unit number or a given specified unit number.
1009 * In addition these routines support paired devices (pty, nmdm and similar)
1010 * by respecting a number of "flag" bits in the minor number.
1015 LIST_HEAD(,cdev) head;
1019 clone_setup(struct clonedevs **cdp)
1022 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO);
1023 LIST_INIT(&(*cdp)->head);
1027 clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up,
1028 struct cdev **dp, int extra)
1030 struct clonedevs *cd;
1031 struct cdev *dev, *ndev, *dl, *de;
1034 KASSERT(*cdp != NULL,
1035 ("clone_setup() not called in driver \"%s\"", csw->d_name));
1036 KASSERT(!(extra & CLONE_UNITMASK),
1037 ("Illegal extra bits (0x%x) in clone_create", extra));
1038 KASSERT(*up <= CLONE_UNITMASK,
1039 ("Too high unit (0x%x) in clone_create", *up));
1040 KASSERT(csw->d_flags & D_NEEDMINOR,
1041 ("clone_create() on cdevsw without minor numbers"));
1045 * Search the list for a lot of things in one go:
1046 * A preexisting match is returned immediately.
1047 * The lowest free unit number if we are passed -1, and the place
1048 * in the list where we should insert that new element.
1049 * The place to insert a specified unit number, if applicable
1050 * the end of the list.
1053 ndev = devfs_alloc(MAKEDEV_WAITOK);
1055 prep_cdevsw(csw, MAKEDEV_WAITOK);
1059 LIST_FOREACH(dev, &cd->head, si_clone) {
1060 KASSERT(dev->si_flags & SI_CLONELIST,
1061 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
1063 if (u == (unit | extra)) {
1069 if (unit == -1 && u == low) {
1073 } else if (u < (unit | extra)) {
1076 } else if (u > (unit | extra)) {
1082 unit = low & CLONE_UNITMASK;
1083 dev = newdev(csw, unit | extra, ndev);
1084 if (dev->si_flags & SI_CLONELIST) {
1085 printf("dev %p (%s) is on clonelist\n", dev, dev->si_name);
1086 printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra);
1087 LIST_FOREACH(dev, &cd->head, si_clone) {
1088 printf("\t%p %s\n", dev, dev->si_name);
1092 KASSERT(!(dev->si_flags & SI_CLONELIST),
1093 ("Dev %p(%s) should not be on clonelist", dev, dev->si_name));
1095 LIST_INSERT_BEFORE(dl, dev, si_clone);
1096 else if (de != NULL)
1097 LIST_INSERT_AFTER(de, dev, si_clone);
1099 LIST_INSERT_HEAD(&cd->head, dev, si_clone);
1100 dev->si_flags |= SI_CLONELIST;
1102 dev_unlock_and_free();
1107 * Kill everything still on the list. The driver should already have
1108 * disposed of any softc hung of the struct cdev *'s at this time.
1111 clone_cleanup(struct clonedevs **cdp)
1114 struct cdev_priv *cp;
1115 struct clonedevs *cd;
1121 while (!LIST_EMPTY(&cd->head)) {
1122 dev = LIST_FIRST(&cd->head);
1123 LIST_REMOVE(dev, si_clone);
1124 KASSERT(dev->si_flags & SI_CLONELIST,
1125 ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
1126 dev->si_flags &= ~SI_CLONELIST;
1127 cp = cdev2priv(dev);
1128 if (!(cp->cdp_flags & CDP_SCHED_DTR)) {
1129 cp->cdp_flags |= CDP_SCHED_DTR;
1130 KASSERT(dev->si_flags & SI_NAMED,
1131 ("Driver has goofed in cloning underways udev %x unit %x", dev2udev(dev), dev2unit(dev)));
1135 dev_unlock_and_free();
1140 static TAILQ_HEAD(, cdev_priv) dev_ddtr =
1141 TAILQ_HEAD_INITIALIZER(dev_ddtr);
1142 static struct task dev_dtr_task;
1145 destroy_dev_tq(void *ctx, int pending)
1147 struct cdev_priv *cp;
1153 while (!TAILQ_EMPTY(&dev_ddtr)) {
1154 cp = TAILQ_FIRST(&dev_ddtr);
1156 KASSERT(cp->cdp_flags & CDP_SCHED_DTR,
1157 ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp));
1158 TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list);
1159 cb = cp->cdp_dtr_cb;
1160 cb_arg = cp->cdp_dtr_cb_arg;
1162 dev_unlock_and_free();
1172 * devmtx shall be locked on entry. devmtx will be unlocked after
1176 destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg)
1178 struct cdev_priv *cp;
1180 mtx_assert(&devmtx, MA_OWNED);
1181 cp = cdev2priv(dev);
1182 if (cp->cdp_flags & CDP_SCHED_DTR) {
1187 cp->cdp_flags |= CDP_SCHED_DTR;
1188 cp->cdp_dtr_cb = cb;
1189 cp->cdp_dtr_cb_arg = arg;
1190 TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list);
1192 taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task);
1197 destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg)
1201 return (destroy_dev_sched_cbl(dev, cb, arg));
1205 destroy_dev_sched(struct cdev *dev)
1208 return (destroy_dev_sched_cb(dev, NULL, NULL));
1212 destroy_dev_drain(struct cdevsw *csw)
1216 while (!LIST_EMPTY(&csw->d_devs)) {
1217 msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10);
1223 drain_dev_clone_events(void)
1226 sx_xlock(&clone_drain_lock);
1227 sx_xunlock(&clone_drain_lock);
1231 devdtr_init(void *dummy __unused)
1234 TASK_INIT(&dev_dtr_task, 0, destroy_dev_tq, NULL);
1237 SYSINIT(devdtr, SI_SUB_DEVFS, SI_ORDER_SECOND, devdtr_init, NULL);
1239 #include "opt_ddb.h"
1241 #include <sys/kernel.h>
1243 #include <ddb/ddb.h>
1245 DB_SHOW_COMMAND(cdev, db_show_cdev)
1247 struct cdev_priv *cdp;
1253 TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) {
1255 db_printf("%s %p\n", dev->si_name, dev);
1262 dev = (struct cdev *)addr;
1263 cdp = cdev2priv(dev);
1264 db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n",
1265 dev->si_name, dev->si_refcount, dev->si_usecount,
1266 dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first);
1267 db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n",
1268 dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2);
1269 flags = dev->si_flags;
1270 #define SI_FLAG(flag) do { \
1271 if (flags & (flag)) { \
1272 if (buf[0] != '\0') \
1273 strlcat(buf, ", ", sizeof(buf)); \
1274 strlcat(buf, (#flag) + 3, sizeof(buf)); \
1279 SI_FLAG(SI_ETERNAL);
1282 SI_FLAG(SI_CHEAPCLONE);
1284 SI_FLAG(SI_DEVOPEN);
1285 SI_FLAG(SI_CONSOPEN);
1286 SI_FLAG(SI_DUMPDEV);
1287 SI_FLAG(SI_CANDELETE);
1288 SI_FLAG(SI_CLONELIST);
1289 db_printf("si_flags %s\n", buf);
1291 flags = cdp->cdp_flags;
1292 #define CDP_FLAG(flag) do { \
1293 if (flags & (flag)) { \
1294 if (buf[0] != '\0') \
1295 strlcat(buf, ", ", sizeof(buf)); \
1296 strlcat(buf, (#flag) + 4, sizeof(buf)); \
1301 CDP_FLAG(CDP_ACTIVE);
1302 CDP_FLAG(CDP_SCHED_DTR);
1303 db_printf("cdp_flags %s\n", buf);