[rtems-libbsd commit] kern_conf.c: Import from FreeBSD.
Sebastian Huber
sebh at rtems.org
Tue Aug 2 11:21:58 UTC 2016
Module: rtems-libbsd
Branch: master
Commit: 6c0cfc217332129e6b0b4ca9cb9877f9fb0c7895
Changeset: http://git.rtems.org/rtems-libbsd/commit/?id=6c0cfc217332129e6b0b4ca9cb9877f9fb0c7895
Author: Christian Mauderer <Christian.Mauderer at embedded-brains.de>
Date: Wed Jun 29 10:22:03 2016 +0200
kern_conf.c: Import from FreeBSD.
---
freebsd/sys/kern/kern_conf.c | 1520 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 1520 insertions(+)
diff --git a/freebsd/sys/kern/kern_conf.c b/freebsd/sys/kern/kern_conf.c
new file mode 100644
index 0000000..a5bd68c
--- /dev/null
+++ b/freebsd/sys/kern/kern_conf.c
@@ -0,0 +1,1520 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*-
+ * Copyright (c) 1999-2002 Poul-Henning Kamp
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <rtems/bsd/sys/param.h>
+#include <sys/kernel.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/bio.h>
+#include <rtems/bsd/sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/module.h>
+#include <sys/malloc.h>
+#include <sys/conf.h>
+#include <sys/vnode.h>
+#include <sys/queue.h>
+#include <sys/poll.h>
+#include <sys/sx.h>
+#include <sys/ctype.h>
+#include <sys/ucred.h>
+#include <sys/taskqueue.h>
+#include <machine/stdarg.h>
+
+#include <fs/devfs/devfs_int.h>
+#include <vm/vm.h>
+
+static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage");
+
+struct mtx devmtx;
+static void destroy_devl(struct cdev *dev);
+static int destroy_dev_sched_cbl(struct cdev *dev,
+ void (*cb)(void *), void *arg);
+static int make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw,
+ int unit, struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt,
+ va_list ap);
+
+static struct cdev_priv_list cdevp_free_list =
+ TAILQ_HEAD_INITIALIZER(cdevp_free_list);
+static SLIST_HEAD(free_cdevsw, cdevsw) cdevsw_gt_post_list =
+ SLIST_HEAD_INITIALIZER(cdevsw_gt_post_list);
+
+void
+dev_lock(void)
+{
+
+ mtx_lock(&devmtx);
+}
+
+/*
+ * Free all the memory collected while the cdev mutex was
+ * locked. Since devmtx is after the system map mutex, free() cannot
+ * be called immediately and is postponed until cdev mutex can be
+ * dropped.
+ */
+static void
+dev_unlock_and_free(void)
+{
+ struct cdev_priv_list cdp_free;
+ struct free_cdevsw csw_free;
+ struct cdev_priv *cdp;
+ struct cdevsw *csw;
+
+ mtx_assert(&devmtx, MA_OWNED);
+
+ /*
+ * Make the local copy of the list heads while the dev_mtx is
+ * held. Free it later.
+ */
+ TAILQ_INIT(&cdp_free);
+ TAILQ_CONCAT(&cdp_free, &cdevp_free_list, cdp_list);
+ csw_free = cdevsw_gt_post_list;
+ SLIST_INIT(&cdevsw_gt_post_list);
+
+ mtx_unlock(&devmtx);
+
+ while ((cdp = TAILQ_FIRST(&cdp_free)) != NULL) {
+ TAILQ_REMOVE(&cdp_free, cdp, cdp_list);
+ devfs_free(&cdp->cdp_c);
+ }
+ while ((csw = SLIST_FIRST(&csw_free)) != NULL) {
+ SLIST_REMOVE_HEAD(&csw_free, d_postfree_list);
+ free(csw, M_DEVT);
+ }
+}
+
+static void
+dev_free_devlocked(struct cdev *cdev)
+{
+ struct cdev_priv *cdp;
+
+ mtx_assert(&devmtx, MA_OWNED);
+ cdp = cdev2priv(cdev);
+ KASSERT((cdp->cdp_flags & CDP_UNREF_DTR) == 0,
+ ("destroy_dev() was not called after delist_dev(%p)", cdev));
+ TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list);
+}
+
+static void
+cdevsw_free_devlocked(struct cdevsw *csw)
+{
+
+ mtx_assert(&devmtx, MA_OWNED);
+ SLIST_INSERT_HEAD(&cdevsw_gt_post_list, csw, d_postfree_list);
+}
+
+void
+dev_unlock(void)
+{
+
+ mtx_unlock(&devmtx);
+}
+
+void
+dev_ref(struct cdev *dev)
+{
+
+ mtx_assert(&devmtx, MA_NOTOWNED);
+ mtx_lock(&devmtx);
+ dev->si_refcount++;
+ mtx_unlock(&devmtx);
+}
+
+void
+dev_refl(struct cdev *dev)
+{
+
+ mtx_assert(&devmtx, MA_OWNED);
+ dev->si_refcount++;
+}
+
+void
+dev_rel(struct cdev *dev)
+{
+ int flag = 0;
+
+ mtx_assert(&devmtx, MA_NOTOWNED);
+ dev_lock();
+ dev->si_refcount--;
+ KASSERT(dev->si_refcount >= 0,
+ ("dev_rel(%s) gave negative count", devtoname(dev)));
+#if 0
+ if (dev->si_usecount == 0 &&
+ (dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED))
+ ;
+ else
+#endif
+ if (dev->si_devsw == NULL && dev->si_refcount == 0) {
+ LIST_REMOVE(dev, si_list);
+ flag = 1;
+ }
+ dev_unlock();
+ if (flag)
+ devfs_free(dev);
+}
+
+struct cdevsw *
+dev_refthread(struct cdev *dev, int *ref)
+{
+ struct cdevsw *csw;
+ struct cdev_priv *cdp;
+
+ mtx_assert(&devmtx, MA_NOTOWNED);
+ if ((dev->si_flags & SI_ETERNAL) != 0) {
+ *ref = 0;
+ return (dev->si_devsw);
+ }
+ dev_lock();
+ csw = dev->si_devsw;
+ if (csw != NULL) {
+ cdp = cdev2priv(dev);
+ if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0)
+ dev->si_threadcount++;
+ else
+ csw = NULL;
+ }
+ dev_unlock();
+ *ref = 1;
+ return (csw);
+}
+
+struct cdevsw *
+devvn_refthread(struct vnode *vp, struct cdev **devp, int *ref)
+{
+ struct cdevsw *csw;
+ struct cdev_priv *cdp;
+ struct cdev *dev;
+
+ mtx_assert(&devmtx, MA_NOTOWNED);
+ if ((vp->v_vflag & VV_ETERNALDEV) != 0) {
+ dev = vp->v_rdev;
+ if (dev == NULL)
+ return (NULL);
+ KASSERT((dev->si_flags & SI_ETERNAL) != 0,
+ ("Not eternal cdev"));
+ *ref = 0;
+ csw = dev->si_devsw;
+ KASSERT(csw != NULL, ("Eternal cdev is destroyed"));
+ *devp = dev;
+ return (csw);
+ }
+
+ csw = NULL;
+ dev_lock();
+ dev = vp->v_rdev;
+ if (dev == NULL) {
+ dev_unlock();
+ return (NULL);
+ }
+ cdp = cdev2priv(dev);
+ if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) {
+ csw = dev->si_devsw;
+ if (csw != NULL)
+ dev->si_threadcount++;
+ }
+ dev_unlock();
+ if (csw != NULL) {
+ *devp = dev;
+ *ref = 1;
+ }
+ return (csw);
+}
+
+void
+dev_relthread(struct cdev *dev, int ref)
+{
+
+ mtx_assert(&devmtx, MA_NOTOWNED);
+ if (!ref)
+ return;
+ dev_lock();
+ KASSERT(dev->si_threadcount > 0,
+ ("%s threadcount is wrong", dev->si_name));
+ dev->si_threadcount--;
+ dev_unlock();
+}
+
+int
+nullop(void)
+{
+
+ return (0);
+}
+
+int
+eopnotsupp(void)
+{
+
+ return (EOPNOTSUPP);
+}
+
+static int
+enxio(void)
+{
+ return (ENXIO);
+}
+
+static int
+enodev(void)
+{
+ return (ENODEV);
+}
+
+/* Define a dead_cdevsw for use when devices leave unexpectedly. */
+
+#define dead_open (d_open_t *)enxio
+#define dead_close (d_close_t *)enxio
+#define dead_read (d_read_t *)enxio
+#define dead_write (d_write_t *)enxio
+#define dead_ioctl (d_ioctl_t *)enxio
+#define dead_poll (d_poll_t *)enodev
+#define dead_mmap (d_mmap_t *)enodev
+
+static void
+dead_strategy(struct bio *bp)
+{
+
+ biofinish(bp, NULL, ENXIO);
+}
+
+#define dead_dump (dumper_t *)enxio
+#define dead_kqfilter (d_kqfilter_t *)enxio
+#define dead_mmap_single (d_mmap_single_t *)enodev
+
+static struct cdevsw dead_cdevsw = {
+ .d_version = D_VERSION,
+ .d_open = dead_open,
+ .d_close = dead_close,
+ .d_read = dead_read,
+ .d_write = dead_write,
+ .d_ioctl = dead_ioctl,
+ .d_poll = dead_poll,
+ .d_mmap = dead_mmap,
+ .d_strategy = dead_strategy,
+ .d_name = "dead",
+ .d_dump = dead_dump,
+ .d_kqfilter = dead_kqfilter,
+ .d_mmap_single = dead_mmap_single
+};
+
+/* Default methods if driver does not specify method */
+
+#define null_open (d_open_t *)nullop
+#define null_close (d_close_t *)nullop
+#define no_read (d_read_t *)enodev
+#define no_write (d_write_t *)enodev
+#define no_ioctl (d_ioctl_t *)enodev
+#define no_mmap (d_mmap_t *)enodev
+#define no_kqfilter (d_kqfilter_t *)enodev
+#define no_mmap_single (d_mmap_single_t *)enodev
+
+static void
+no_strategy(struct bio *bp)
+{
+
+ biofinish(bp, NULL, ENODEV);
+}
+
+static int
+no_poll(struct cdev *dev __unused, int events, struct thread *td __unused)
+{
+
+ return (poll_no_poll(events));
+}
+
+#define no_dump (dumper_t *)enodev
+
+static int
+giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
+{
+ struct cdevsw *dsw;
+ int ref, retval;
+
+ dsw = dev_refthread(dev, &ref);
+ if (dsw == NULL)
+ return (ENXIO);
+ mtx_lock(&Giant);
+ retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td);
+ mtx_unlock(&Giant);
+ dev_relthread(dev, ref);
+ return (retval);
+}
+
+static int
+giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp)
+{
+ struct cdevsw *dsw;
+ int ref, retval;
+
+ dsw = dev_refthread(dev, &ref);
+ if (dsw == NULL)
+ return (ENXIO);
+ mtx_lock(&Giant);
+ retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp);
+ mtx_unlock(&Giant);
+ dev_relthread(dev, ref);
+ return (retval);
+}
+
+static int
+giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
+{
+ struct cdevsw *dsw;
+ int ref, retval;
+
+ dsw = dev_refthread(dev, &ref);
+ if (dsw == NULL)
+ return (ENXIO);
+ mtx_lock(&Giant);
+ retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td);
+ mtx_unlock(&Giant);
+ dev_relthread(dev, ref);
+ return (retval);
+}
+
+static void
+giant_strategy(struct bio *bp)
+{
+ struct cdevsw *dsw;
+ struct cdev *dev;
+ int ref;
+
+ dev = bp->bio_dev;
+ dsw = dev_refthread(dev, &ref);
+ if (dsw == NULL) {
+ biofinish(bp, NULL, ENXIO);
+ return;
+ }
+ mtx_lock(&Giant);
+ dsw->d_gianttrick->d_strategy(bp);
+ mtx_unlock(&Giant);
+ dev_relthread(dev, ref);
+}
+
+static int
+giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
+{
+ struct cdevsw *dsw;
+ int ref, retval;
+
+ dsw = dev_refthread(dev, &ref);
+ if (dsw == NULL)
+ return (ENXIO);
+ mtx_lock(&Giant);
+ retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td);
+ mtx_unlock(&Giant);
+ dev_relthread(dev, ref);
+ return (retval);
+}
+
+static int
+giant_read(struct cdev *dev, struct uio *uio, int ioflag)
+{
+ struct cdevsw *dsw;
+ int ref, retval;
+
+ dsw = dev_refthread(dev, &ref);
+ if (dsw == NULL)
+ return (ENXIO);
+ mtx_lock(&Giant);
+ retval = dsw->d_gianttrick->d_read(dev, uio, ioflag);
+ mtx_unlock(&Giant);
+ dev_relthread(dev, ref);
+ return (retval);
+}
+
+static int
+giant_write(struct cdev *dev, struct uio *uio, int ioflag)
+{
+ struct cdevsw *dsw;
+ int ref, retval;
+
+ dsw = dev_refthread(dev, &ref);
+ if (dsw == NULL)
+ return (ENXIO);
+ mtx_lock(&Giant);
+ retval = dsw->d_gianttrick->d_write(dev, uio, ioflag);
+ mtx_unlock(&Giant);
+ dev_relthread(dev, ref);
+ return (retval);
+}
+
+static int
+giant_poll(struct cdev *dev, int events, struct thread *td)
+{
+ struct cdevsw *dsw;
+ int ref, retval;
+
+ dsw = dev_refthread(dev, &ref);
+ if (dsw == NULL)
+ return (ENXIO);
+ mtx_lock(&Giant);
+ retval = dsw->d_gianttrick->d_poll(dev, events, td);
+ mtx_unlock(&Giant);
+ dev_relthread(dev, ref);
+ return (retval);
+}
+
+static int
+giant_kqfilter(struct cdev *dev, struct knote *kn)
+{
+ struct cdevsw *dsw;
+ int ref, retval;
+
+ dsw = dev_refthread(dev, &ref);
+ if (dsw == NULL)
+ return (ENXIO);
+ mtx_lock(&Giant);
+ retval = dsw->d_gianttrick->d_kqfilter(dev, kn);
+ mtx_unlock(&Giant);
+ dev_relthread(dev, ref);
+ return (retval);
+}
+
+static int
+giant_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
+ vm_memattr_t *memattr)
+{
+ struct cdevsw *dsw;
+ int ref, retval;
+
+ dsw = dev_refthread(dev, &ref);
+ if (dsw == NULL)
+ return (ENXIO);
+ mtx_lock(&Giant);
+ retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot,
+ memattr);
+ mtx_unlock(&Giant);
+ dev_relthread(dev, ref);
+ return (retval);
+}
+
+static int
+giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size,
+ vm_object_t *object, int nprot)
+{
+ struct cdevsw *dsw;
+ int ref, retval;
+
+ dsw = dev_refthread(dev, &ref);
+ if (dsw == NULL)
+ return (ENXIO);
+ mtx_lock(&Giant);
+ retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object,
+ nprot);
+ mtx_unlock(&Giant);
+ dev_relthread(dev, ref);
+ return (retval);
+}
+
+static void
+notify(struct cdev *dev, const char *ev, int flags)
+{
+ static const char prefix[] = "cdev=";
+ char *data;
+ int namelen, mflags;
+
+ if (cold)
+ return;
+ mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK;
+ namelen = strlen(dev->si_name);
+ data = malloc(namelen + sizeof(prefix), M_TEMP, mflags);
+ if (data == NULL)
+ return;
+ memcpy(data, prefix, sizeof(prefix) - 1);
+ memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1);
+ devctl_notify_f("DEVFS", "CDEV", ev, data, mflags);
+ free(data, M_TEMP);
+}
+
+static void
+notify_create(struct cdev *dev, int flags)
+{
+
+ notify(dev, "CREATE", flags);
+}
+
+static void
+notify_destroy(struct cdev *dev)
+{
+
+ notify(dev, "DESTROY", MAKEDEV_WAITOK);
+}
+
+static struct cdev *
+newdev(struct cdevsw *csw, int unit, struct cdev *si)
+{
+ struct cdev *si2;
+
+ mtx_assert(&devmtx, MA_OWNED);
+ if (csw->d_flags & D_NEEDMINOR) {
+ /* We may want to return an existing device */
+ LIST_FOREACH(si2, &csw->d_devs, si_list) {
+ if (dev2unit(si2) == unit) {
+ dev_free_devlocked(si);
+ return (si2);
+ }
+ }
+ }
+ si->si_drv0 = unit;
+ si->si_devsw = csw;
+ LIST_INSERT_HEAD(&csw->d_devs, si, si_list);
+ return (si);
+}
+
+static void
+fini_cdevsw(struct cdevsw *devsw)
+{
+ struct cdevsw *gt;
+
+ if (devsw->d_gianttrick != NULL) {
+ gt = devsw->d_gianttrick;
+ memcpy(devsw, gt, sizeof *devsw);
+ cdevsw_free_devlocked(gt);
+ devsw->d_gianttrick = NULL;
+ }
+ devsw->d_flags &= ~D_INIT;
+}
+
+static int
+prep_cdevsw(struct cdevsw *devsw, int flags)
+{
+ struct cdevsw *dsw2;
+
+ mtx_assert(&devmtx, MA_OWNED);
+ if (devsw->d_flags & D_INIT)
+ return (0);
+ if (devsw->d_flags & D_NEEDGIANT) {
+ dev_unlock();
+ dsw2 = malloc(sizeof *dsw2, M_DEVT,
+ (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK);
+ dev_lock();
+ if (dsw2 == NULL && !(devsw->d_flags & D_INIT))
+ return (ENOMEM);
+ } else
+ dsw2 = NULL;
+ if (devsw->d_flags & D_INIT) {
+ if (dsw2 != NULL)
+ cdevsw_free_devlocked(dsw2);
+ return (0);
+ }
+
+ if (devsw->d_version != D_VERSION_03) {
+ printf(
+ "WARNING: Device driver \"%s\" has wrong version %s\n",
+ devsw->d_name == NULL ? "???" : devsw->d_name,
+ "and is disabled. Recompile KLD module.");
+ devsw->d_open = dead_open;
+ devsw->d_close = dead_close;
+ devsw->d_read = dead_read;
+ devsw->d_write = dead_write;
+ devsw->d_ioctl = dead_ioctl;
+ devsw->d_poll = dead_poll;
+ devsw->d_mmap = dead_mmap;
+ devsw->d_mmap_single = dead_mmap_single;
+ devsw->d_strategy = dead_strategy;
+ devsw->d_dump = dead_dump;
+ devsw->d_kqfilter = dead_kqfilter;
+ }
+
+ if (devsw->d_flags & D_NEEDGIANT) {
+ if (devsw->d_gianttrick == NULL) {
+ memcpy(dsw2, devsw, sizeof *dsw2);
+ devsw->d_gianttrick = dsw2;
+ dsw2 = NULL;
+ }
+ }
+
+#define FIXUP(member, noop, giant) \
+ do { \
+ if (devsw->member == NULL) { \
+ devsw->member = noop; \
+ } else if (devsw->d_flags & D_NEEDGIANT) \
+ devsw->member = giant; \
+ } \
+ while (0)
+
+ FIXUP(d_open, null_open, giant_open);
+ FIXUP(d_fdopen, NULL, giant_fdopen);
+ FIXUP(d_close, null_close, giant_close);
+ FIXUP(d_read, no_read, giant_read);
+ FIXUP(d_write, no_write, giant_write);
+ FIXUP(d_ioctl, no_ioctl, giant_ioctl);
+ FIXUP(d_poll, no_poll, giant_poll);
+ FIXUP(d_mmap, no_mmap, giant_mmap);
+ FIXUP(d_strategy, no_strategy, giant_strategy);
+ FIXUP(d_kqfilter, no_kqfilter, giant_kqfilter);
+ FIXUP(d_mmap_single, no_mmap_single, giant_mmap_single);
+
+ if (devsw->d_dump == NULL) devsw->d_dump = no_dump;
+
+ LIST_INIT(&devsw->d_devs);
+
+ devsw->d_flags |= D_INIT;
+
+ if (dsw2 != NULL)
+ cdevsw_free_devlocked(dsw2);
+ return (0);
+}
+
+static int
+prep_devname(struct cdev *dev, const char *fmt, va_list ap)
+{
+ int len;
+ char *from, *q, *s, *to;
+
+ mtx_assert(&devmtx, MA_OWNED);
+
+ len = vsnrprintf(dev->__si_namebuf, sizeof(dev->__si_namebuf), 32,
+ fmt, ap);
+ if (len > sizeof(dev->__si_namebuf) - 1)
+ return (ENAMETOOLONG);
+
+ /* Strip leading slashes. */
+ for (from = dev->__si_namebuf; *from == '/'; from++)
+ ;
+
+ for (to = dev->__si_namebuf; *from != '\0'; from++, to++) {
+ /* Treat multiple sequential slashes as single. */
+ while (from[0] == '/' && from[1] == '/')
+ from++;
+ /* Trailing slash is considered invalid. */
+ if (from[0] == '/' && from[1] == '\0')
+ return (EINVAL);
+ *to = *from;
+ }
+ *to = '\0';
+
+ if (dev->__si_namebuf[0] == '\0')
+ return (EINVAL);
+
+ /* Disallow "." and ".." components. */
+ for (s = dev->__si_namebuf;;) {
+ for (q = s; *q != '/' && *q != '\0'; q++)
+ ;
+ if (q - s == 1 && s[0] == '.')
+ return (EINVAL);
+ if (q - s == 2 && s[0] == '.' && s[1] == '.')
+ return (EINVAL);
+ if (*q != '/')
+ break;
+ s = q + 1;
+ }
+
+ if (devfs_dev_exists(dev->__si_namebuf) != 0)
+ return (EEXIST);
+
+ return (0);
+}
+
+static int
+make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw, int unit,
+ struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt,
+ va_list ap)
+{
+ struct cdev *dev, *dev_new;
+ int res;
+
+ KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0,
+ ("make_dev_credv: both WAITOK and NOWAIT specified"));
+ dev_new = devfs_alloc(flags);
+ if (dev_new == NULL)
+ return (ENOMEM);
+ dev_lock();
+ res = prep_cdevsw(devsw, flags);
+ if (res != 0) {
+ dev_unlock();
+ devfs_free(dev_new);
+ return (res);
+ }
+ dev = newdev(devsw, unit, dev_new);
+ if ((dev->si_flags & SI_NAMED) == 0) {
+ res = prep_devname(dev, fmt, ap);
+ if (res != 0) {
+ if ((flags & MAKEDEV_CHECKNAME) == 0) {
+ panic(
+ "make_dev_credv: bad si_name (error=%d, si_name=%s)",
+ res, dev->si_name);
+ }
+ if (dev == dev_new) {
+ LIST_REMOVE(dev, si_list);
+ dev_unlock();
+ devfs_free(dev);
+ } else
+ dev_unlock();
+ return (res);
+ }
+ }
+ if (flags & MAKEDEV_REF)
+ dev_refl(dev);
+ if (flags & MAKEDEV_ETERNAL)
+ dev->si_flags |= SI_ETERNAL;
+ if (dev->si_flags & SI_CHEAPCLONE &&
+ dev->si_flags & SI_NAMED) {
+ /*
+ * This is allowed as it removes races and generally
+ * simplifies cloning devices.
+ * XXX: still ??
+ */
+ dev_unlock_and_free();
+ *dres = dev;
+ return (0);
+ }
+ KASSERT(!(dev->si_flags & SI_NAMED),
+ ("make_dev() by driver %s on pre-existing device (min=%x, name=%s)",
+ devsw->d_name, dev2unit(dev), devtoname(dev)));
+ dev->si_flags |= SI_NAMED;
+ if (cr != NULL)
+ dev->si_cred = crhold(cr);
+ dev->si_uid = uid;
+ dev->si_gid = gid;
+ dev->si_mode = mode;
+
+ devfs_create(dev);
+ clean_unrhdrl(devfs_inos);
+ dev_unlock_and_free();
+
+ notify_create(dev, flags);
+
+ *dres = dev;
+ return (0);
+}
+
+struct cdev *
+make_dev(struct cdevsw *devsw, int unit, uid_t uid, gid_t gid, int mode,
+ const char *fmt, ...)
+{
+ struct cdev *dev;
+ va_list ap;
+ int res;
+
+ va_start(ap, fmt);
+ res = make_dev_credv(0, &dev, devsw, unit, NULL, uid, gid, mode, fmt,
+ ap);
+ va_end(ap);
+ KASSERT(res == 0 && dev != NULL,
+ ("make_dev: failed make_dev_credv (error=%d)", res));
+ return (dev);
+}
+
+struct cdev *
+make_dev_cred(struct cdevsw *devsw, int unit, struct ucred *cr, uid_t uid,
+ gid_t gid, int mode, const char *fmt, ...)
+{
+ struct cdev *dev;
+ va_list ap;
+ int res;
+
+ va_start(ap, fmt);
+ res = make_dev_credv(0, &dev, devsw, unit, cr, uid, gid, mode, fmt, ap);
+ va_end(ap);
+
+ KASSERT(res == 0 && dev != NULL,
+ ("make_dev_cred: failed make_dev_credv (error=%d)", res));
+ return (dev);
+}
+
+struct cdev *
+make_dev_credf(int flags, struct cdevsw *devsw, int unit, struct ucred *cr,
+ uid_t uid, gid_t gid, int mode, const char *fmt, ...)
+{
+ struct cdev *dev;
+ va_list ap;
+ int res;
+
+ va_start(ap, fmt);
+ res = make_dev_credv(flags, &dev, devsw, unit, cr, uid, gid, mode,
+ fmt, ap);
+ va_end(ap);
+
+ KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) ||
+ ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0,
+ ("make_dev_credf: failed make_dev_credv (error=%d)", res));
+ return (res == 0 ? dev : NULL);
+}
+
+int
+make_dev_p(int flags, struct cdev **cdev, struct cdevsw *devsw,
+ struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt, ...)
+{
+ va_list ap;
+ int res;
+
+ va_start(ap, fmt);
+ res = make_dev_credv(flags, cdev, devsw, 0, cr, uid, gid, mode,
+ fmt, ap);
+ va_end(ap);
+
+ KASSERT(((flags & MAKEDEV_NOWAIT) != 0 && res == ENOMEM) ||
+ ((flags & MAKEDEV_CHECKNAME) != 0 && res != ENOMEM) || res == 0,
+ ("make_dev_p: failed make_dev_credv (error=%d)", res));
+ return (res);
+}
+
+static void
+dev_dependsl(struct cdev *pdev, struct cdev *cdev)
+{
+
+ cdev->si_parent = pdev;
+ cdev->si_flags |= SI_CHILD;
+ LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
+}
+
+
+void
+dev_depends(struct cdev *pdev, struct cdev *cdev)
+{
+
+ dev_lock();
+ dev_dependsl(pdev, cdev);
+ dev_unlock();
+}
+
+static int
+make_dev_alias_v(int flags, struct cdev **cdev, struct cdev *pdev,
+ const char *fmt, va_list ap)
+{
+ struct cdev *dev;
+ int error;
+
+ KASSERT(pdev != NULL, ("make_dev_alias_v: pdev is NULL"));
+ KASSERT((flags & MAKEDEV_WAITOK) == 0 || (flags & MAKEDEV_NOWAIT) == 0,
+ ("make_dev_alias_v: both WAITOK and NOWAIT specified"));
+ KASSERT((flags & ~(MAKEDEV_WAITOK | MAKEDEV_NOWAIT |
+ MAKEDEV_CHECKNAME)) == 0,
+ ("make_dev_alias_v: invalid flags specified (flags=%02x)", flags));
+
+ dev = devfs_alloc(flags);
+ if (dev == NULL)
+ return (ENOMEM);
+ dev_lock();
+ dev->si_flags |= SI_ALIAS;
+ error = prep_devname(dev, fmt, ap);
+ if (error != 0) {
+ if ((flags & MAKEDEV_CHECKNAME) == 0) {
+ panic("make_dev_alias_v: bad si_name "
+ "(error=%d, si_name=%s)", error, dev->si_name);
+ }
+ dev_unlock();
+ devfs_free(dev);
+ return (error);
+ }
+ dev->si_flags |= SI_NAMED;
+ devfs_create(dev);
+ dev_dependsl(pdev, dev);
+ clean_unrhdrl(devfs_inos);
+ dev_unlock();
+
+ notify_create(dev, flags);
+ *cdev = dev;
+
+ return (0);
+}
+
+struct cdev *
+make_dev_alias(struct cdev *pdev, const char *fmt, ...)
+{
+ struct cdev *dev;
+ va_list ap;
+ int res;
+
+ va_start(ap, fmt);
+ res = make_dev_alias_v(MAKEDEV_WAITOK, &dev, pdev, fmt, ap);
+ va_end(ap);
+
+ KASSERT(res == 0 && dev != NULL,
+ ("make_dev_alias: failed make_dev_alias_v (error=%d)", res));
+ return (dev);
+}
+
+int
+make_dev_alias_p(int flags, struct cdev **cdev, struct cdev *pdev,
+ const char *fmt, ...)
+{
+ va_list ap;
+ int res;
+
+ va_start(ap, fmt);
+ res = make_dev_alias_v(flags, cdev, pdev, fmt, ap);
+ va_end(ap);
+ return (res);
+}
+
+int
+make_dev_physpath_alias(int flags, struct cdev **cdev, struct cdev *pdev,
+ struct cdev *old_alias, const char *physpath)
+{
+ char *devfspath;
+ int physpath_len;
+ int max_parentpath_len;
+ int parentpath_len;
+ int devfspathbuf_len;
+ int mflags;
+ int ret;
+
+ *cdev = NULL;
+ devfspath = NULL;
+ physpath_len = strlen(physpath);
+ ret = EINVAL;
+ if (physpath_len == 0)
+ goto out;
+
+ if (strncmp("id1,", physpath, 4) == 0) {
+ physpath += 4;
+ physpath_len -= 4;
+ if (physpath_len == 0)
+ goto out;
+ }
+
+ max_parentpath_len = SPECNAMELEN - physpath_len - /*/*/1;
+ parentpath_len = strlen(pdev->si_name);
+ if (max_parentpath_len < parentpath_len) {
+ if (bootverbose)
+ printf("WARNING: Unable to alias %s "
+ "to %s/%s - path too long\n",
+ pdev->si_name, physpath, pdev->si_name);
+ ret = ENAMETOOLONG;
+ goto out;
+ }
+
+ mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK;
+ devfspathbuf_len = physpath_len + /*/*/1 + parentpath_len + /*NUL*/1;
+ devfspath = malloc(devfspathbuf_len, M_DEVBUF, mflags);
+ if (devfspath == NULL) {
+ ret = ENOMEM;
+ goto out;
+ }
+
+ sprintf(devfspath, "%s/%s", physpath, pdev->si_name);
+ if (old_alias != NULL && strcmp(old_alias->si_name, devfspath) == 0) {
+ /* Retain the existing alias. */
+ *cdev = old_alias;
+ old_alias = NULL;
+ ret = 0;
+ } else {
+ ret = make_dev_alias_p(flags, cdev, pdev, "%s", devfspath);
+ }
+out:
+ if (old_alias != NULL)
+ destroy_dev(old_alias);
+ if (devfspath != NULL)
+ free(devfspath, M_DEVBUF);
+ return (ret);
+}
+
+static void
+destroy_devl(struct cdev *dev)
+{
+ struct cdevsw *csw;
+ struct cdev_privdata *p;
+ struct cdev_priv *cdp;
+
+ mtx_assert(&devmtx, MA_OWNED);
+ KASSERT(dev->si_flags & SI_NAMED,
+ ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(dev)));
+ KASSERT((dev->si_flags & SI_ETERNAL) == 0,
+ ("WARNING: Driver mistake: destroy_dev on eternal %d\n",
+ dev2unit(dev)));
+
+ cdp = cdev2priv(dev);
+ if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) {
+ /*
+ * Avoid race with dev_rel(), e.g. from the populate
+ * loop. If CDP_UNREF_DTR flag is set, the reference
+ * to be dropped at the end of destroy_devl() was
+ * already taken by delist_dev_locked().
+ */
+ dev_refl(dev);
+
+ devfs_destroy(dev);
+ }
+
+ /* Remove name marking */
+ dev->si_flags &= ~SI_NAMED;
+
+ /* If we are a child, remove us from the parents list */
+ if (dev->si_flags & SI_CHILD) {
+ LIST_REMOVE(dev, si_siblings);
+ dev->si_flags &= ~SI_CHILD;
+ }
+
+ /* Kill our children */
+ while (!LIST_EMPTY(&dev->si_children))
+ destroy_devl(LIST_FIRST(&dev->si_children));
+
+ /* Remove from clone list */
+ if (dev->si_flags & SI_CLONELIST) {
+ LIST_REMOVE(dev, si_clone);
+ dev->si_flags &= ~SI_CLONELIST;
+ }
+
+ csw = dev->si_devsw;
+ dev->si_devsw = NULL; /* already NULL for SI_ALIAS */
+ while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) {
+ csw->d_purge(dev);
+ msleep(csw, &devmtx, PRIBIO, "devprg", hz/10);
+ if (dev->si_threadcount)
+ printf("Still %lu threads in %s\n",
+ dev->si_threadcount, devtoname(dev));
+ }
+ while (dev->si_threadcount != 0) {
+ /* Use unique dummy wait ident */
+ msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10);
+ }
+
+ dev_unlock();
+ if ((cdp->cdp_flags & CDP_UNREF_DTR) == 0) {
+ /* avoid out of order notify events */
+ notify_destroy(dev);
+ }
+ mtx_lock(&cdevpriv_mtx);
+ while ((p = LIST_FIRST(&cdp->cdp_fdpriv)) != NULL) {
+ devfs_destroy_cdevpriv(p);
+ mtx_lock(&cdevpriv_mtx);
+ }
+ mtx_unlock(&cdevpriv_mtx);
+ dev_lock();
+
+ dev->si_drv1 = 0;
+ dev->si_drv2 = 0;
+ bzero(&dev->__si_u, sizeof(dev->__si_u));
+
+ if (!(dev->si_flags & SI_ALIAS)) {
+ /* Remove from cdevsw list */
+ LIST_REMOVE(dev, si_list);
+
+ /* If cdevsw has no more struct cdev *'s, clean it */
+ if (LIST_EMPTY(&csw->d_devs)) {
+ fini_cdevsw(csw);
+ wakeup(&csw->d_devs);
+ }
+ }
+ dev->si_flags &= ~SI_ALIAS;
+ cdp->cdp_flags &= ~CDP_UNREF_DTR;
+ dev->si_refcount--;
+
+ if (dev->si_refcount > 0)
+ LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
+ else
+ dev_free_devlocked(dev);
+}
+
+static void
+delist_dev_locked(struct cdev *dev)
+{
+ struct cdev_priv *cdp;
+ struct cdev *child;
+
+ mtx_assert(&devmtx, MA_OWNED);
+ cdp = cdev2priv(dev);
+ if ((cdp->cdp_flags & CDP_UNREF_DTR) != 0)
+ return;
+ cdp->cdp_flags |= CDP_UNREF_DTR;
+ dev_refl(dev);
+ devfs_destroy(dev);
+ LIST_FOREACH(child, &dev->si_children, si_siblings)
+ delist_dev_locked(child);
+ dev_unlock();
+ /* ensure the destroy event is queued in order */
+ notify_destroy(dev);
+ dev_lock();
+}
+
+/*
+ * This function will delist a character device and its children from
+ * the directory listing and create a destroy event without waiting
+ * for all character device references to go away. At some later point
+ * destroy_dev() must be called to complete the character device
+ * destruction. After calling this function the character device name
+ * can instantly be re-used.
+ */
+void
+delist_dev(struct cdev *dev)
+{
+
+ WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "delist_dev");
+ dev_lock();
+ delist_dev_locked(dev);
+ dev_unlock();
+}
+
+void
+destroy_dev(struct cdev *dev)
+{
+
+ WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, "destroy_dev");
+ dev_lock();
+ destroy_devl(dev);
+ dev_unlock_and_free();
+}
+
+const char *
+devtoname(struct cdev *dev)
+{
+
+ return (dev->si_name);
+}
+
+int
+dev_stdclone(char *name, char **namep, const char *stem, int *unit)
+{
+ int u, i;
+
+ i = strlen(stem);
+ if (bcmp(stem, name, i) != 0)
+ return (0);
+ if (!isdigit(name[i]))
+ return (0);
+ u = 0;
+ if (name[i] == '0' && isdigit(name[i+1]))
+ return (0);
+ while (isdigit(name[i])) {
+ u *= 10;
+ u += name[i++] - '0';
+ }
+ if (u > 0xffffff)
+ return (0);
+ *unit = u;
+ if (namep)
+ *namep = &name[i];
+ if (name[i])
+ return (2);
+ return (1);
+}
+
+/*
+ * Helper functions for cloning device drivers.
+ *
+ * The objective here is to make it unnecessary for the device drivers to
+ * use rman or similar to manage their unit number space. Due to the way
+ * we do "on-demand" devices, using rman or other "private" methods
+ * will be very tricky to lock down properly once we lock down this file.
+ *
+ * Instead we give the drivers these routines which puts the struct cdev *'s
+ * that are to be managed on their own list, and gives the driver the ability
+ * to ask for the first free unit number or a given specified unit number.
+ *
+ * In addition these routines support paired devices (pty, nmdm and similar)
+ * by respecting a number of "flag" bits in the minor number.
+ *
+ */
+
+struct clonedevs {
+ LIST_HEAD(,cdev) head;
+};
+
+void
+clone_setup(struct clonedevs **cdp)
+{
+
+ *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO);
+ LIST_INIT(&(*cdp)->head);
+}
+
+int
+clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up,
+ struct cdev **dp, int extra)
+{
+ struct clonedevs *cd;
+ struct cdev *dev, *ndev, *dl, *de;
+ int unit, low, u;
+
+ KASSERT(*cdp != NULL,
+ ("clone_setup() not called in driver \"%s\"", csw->d_name));
+ KASSERT(!(extra & CLONE_UNITMASK),
+ ("Illegal extra bits (0x%x) in clone_create", extra));
+ KASSERT(*up <= CLONE_UNITMASK,
+ ("Too high unit (0x%x) in clone_create", *up));
+ KASSERT(csw->d_flags & D_NEEDMINOR,
+ ("clone_create() on cdevsw without minor numbers"));
+
+
+ /*
+ * Search the list for a lot of things in one go:
+ * A preexisting match is returned immediately.
+ * The lowest free unit number if we are passed -1, and the place
+ * in the list where we should insert that new element.
+ * The place to insert a specified unit number, if applicable
+ * the end of the list.
+ */
+ unit = *up;
+ ndev = devfs_alloc(MAKEDEV_WAITOK);
+ dev_lock();
+ prep_cdevsw(csw, MAKEDEV_WAITOK);
+ low = extra;
+ de = dl = NULL;
+ cd = *cdp;
+ LIST_FOREACH(dev, &cd->head, si_clone) {
+ KASSERT(dev->si_flags & SI_CLONELIST,
+ ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
+ u = dev2unit(dev);
+ if (u == (unit | extra)) {
+ *dp = dev;
+ dev_unlock();
+ devfs_free(ndev);
+ return (0);
+ }
+ if (unit == -1 && u == low) {
+ low++;
+ de = dev;
+ continue;
+ } else if (u < (unit | extra)) {
+ de = dev;
+ continue;
+ } else if (u > (unit | extra)) {
+ dl = dev;
+ break;
+ }
+ }
+ if (unit == -1)
+ unit = low & CLONE_UNITMASK;
+ dev = newdev(csw, unit | extra, ndev);
+ if (dev->si_flags & SI_CLONELIST) {
+ printf("dev %p (%s) is on clonelist\n", dev, dev->si_name);
+ printf("unit=%d, low=%d, extra=0x%x\n", unit, low, extra);
+ LIST_FOREACH(dev, &cd->head, si_clone) {
+ printf("\t%p %s\n", dev, dev->si_name);
+ }
+ panic("foo");
+ }
+ KASSERT(!(dev->si_flags & SI_CLONELIST),
+ ("Dev %p(%s) should not be on clonelist", dev, dev->si_name));
+ if (dl != NULL)
+ LIST_INSERT_BEFORE(dl, dev, si_clone);
+ else if (de != NULL)
+ LIST_INSERT_AFTER(de, dev, si_clone);
+ else
+ LIST_INSERT_HEAD(&cd->head, dev, si_clone);
+ dev->si_flags |= SI_CLONELIST;
+ *up = unit;
+ dev_unlock_and_free();
+ return (1);
+}
+
+/*
+ * Kill everything still on the list. The driver should already have
+ * disposed of any softc hung of the struct cdev *'s at this time.
+ */
+void
+clone_cleanup(struct clonedevs **cdp)
+{
+ struct cdev *dev;
+ struct cdev_priv *cp;
+ struct clonedevs *cd;
+
+ cd = *cdp;
+ if (cd == NULL)
+ return;
+ dev_lock();
+ while (!LIST_EMPTY(&cd->head)) {
+ dev = LIST_FIRST(&cd->head);
+ LIST_REMOVE(dev, si_clone);
+ KASSERT(dev->si_flags & SI_CLONELIST,
+ ("Dev %p(%s) should be on clonelist", dev, dev->si_name));
+ dev->si_flags &= ~SI_CLONELIST;
+ cp = cdev2priv(dev);
+ if (!(cp->cdp_flags & CDP_SCHED_DTR)) {
+ cp->cdp_flags |= CDP_SCHED_DTR;
+ KASSERT(dev->si_flags & SI_NAMED,
+ ("Driver has goofed in cloning underways udev %x unit %x", dev2udev(dev), dev2unit(dev)));
+ destroy_devl(dev);
+ }
+ }
+ dev_unlock_and_free();
+ free(cd, M_DEVBUF);
+ *cdp = NULL;
+}
+
+static TAILQ_HEAD(, cdev_priv) dev_ddtr =
+ TAILQ_HEAD_INITIALIZER(dev_ddtr);
+static struct task dev_dtr_task;
+
+static void
+destroy_dev_tq(void *ctx, int pending)
+{
+ struct cdev_priv *cp;
+ struct cdev *dev;
+ void (*cb)(void *);
+ void *cb_arg;
+
+ dev_lock();
+ while (!TAILQ_EMPTY(&dev_ddtr)) {
+ cp = TAILQ_FIRST(&dev_ddtr);
+ dev = &cp->cdp_c;
+ KASSERT(cp->cdp_flags & CDP_SCHED_DTR,
+ ("cdev %p in dev_destroy_tq without CDP_SCHED_DTR", cp));
+ TAILQ_REMOVE(&dev_ddtr, cp, cdp_dtr_list);
+ cb = cp->cdp_dtr_cb;
+ cb_arg = cp->cdp_dtr_cb_arg;
+ destroy_devl(dev);
+ dev_unlock_and_free();
+ dev_rel(dev);
+ if (cb != NULL)
+ cb(cb_arg);
+ dev_lock();
+ }
+ dev_unlock();
+}
+
+/*
+ * devmtx shall be locked on entry. devmtx will be unlocked after
+ * function return.
+ */
+static int
+destroy_dev_sched_cbl(struct cdev *dev, void (*cb)(void *), void *arg)
+{
+ struct cdev_priv *cp;
+
+ mtx_assert(&devmtx, MA_OWNED);
+ cp = cdev2priv(dev);
+ if (cp->cdp_flags & CDP_SCHED_DTR) {
+ dev_unlock();
+ return (0);
+ }
+ dev_refl(dev);
+ cp->cdp_flags |= CDP_SCHED_DTR;
+ cp->cdp_dtr_cb = cb;
+ cp->cdp_dtr_cb_arg = arg;
+ TAILQ_INSERT_TAIL(&dev_ddtr, cp, cdp_dtr_list);
+ dev_unlock();
+ taskqueue_enqueue(taskqueue_swi_giant, &dev_dtr_task);
+ return (1);
+}
+
+int
+destroy_dev_sched_cb(struct cdev *dev, void (*cb)(void *), void *arg)
+{
+
+ dev_lock();
+ return (destroy_dev_sched_cbl(dev, cb, arg));
+}
+
+int
+destroy_dev_sched(struct cdev *dev)
+{
+
+ return (destroy_dev_sched_cb(dev, NULL, NULL));
+}
+
+void
+destroy_dev_drain(struct cdevsw *csw)
+{
+
+ dev_lock();
+ while (!LIST_EMPTY(&csw->d_devs)) {
+ msleep(&csw->d_devs, &devmtx, PRIBIO, "devscd", hz/10);
+ }
+ dev_unlock();
+}
+
+void
+drain_dev_clone_events(void)
+{
+
+ sx_xlock(&clone_drain_lock);
+ sx_xunlock(&clone_drain_lock);
+}
+
+static void
+devdtr_init(void *dummy __unused)
+{
+
+ TASK_INIT(&dev_dtr_task, 0, destroy_dev_tq, NULL);
+}
+
+SYSINIT(devdtr, SI_SUB_DEVFS, SI_ORDER_SECOND, devdtr_init, NULL);
+
+#include <rtems/bsd/local/opt_ddb.h>
+#ifdef DDB
+#include <sys/kernel.h>
+
+#include <ddb/ddb.h>
+
+DB_SHOW_COMMAND(cdev, db_show_cdev)
+{
+ struct cdev_priv *cdp;
+ struct cdev *dev;
+ u_int flags;
+ char buf[512];
+
+ if (!have_addr) {
+ TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) {
+ dev = &cdp->cdp_c;
+ db_printf("%s %p\n", dev->si_name, dev);
+ if (db_pager_quit)
+ break;
+ }
+ return;
+ }
+
+ dev = (struct cdev *)addr;
+ cdp = cdev2priv(dev);
+ db_printf("dev %s ref %d use %ld thr %ld inuse %u fdpriv %p\n",
+ dev->si_name, dev->si_refcount, dev->si_usecount,
+ dev->si_threadcount, cdp->cdp_inuse, cdp->cdp_fdpriv.lh_first);
+ db_printf("devsw %p si_drv0 %d si_drv1 %p si_drv2 %p\n",
+ dev->si_devsw, dev->si_drv0, dev->si_drv1, dev->si_drv2);
+ flags = dev->si_flags;
+#define SI_FLAG(flag) do { \
+ if (flags & (flag)) { \
+ if (buf[0] != '\0') \
+ strlcat(buf, ", ", sizeof(buf)); \
+ strlcat(buf, (#flag) + 3, sizeof(buf)); \
+ flags &= ~(flag); \
+ } \
+} while (0)
+ buf[0] = '\0';
+ SI_FLAG(SI_ETERNAL);
+ SI_FLAG(SI_ALIAS);
+ SI_FLAG(SI_NAMED);
+ SI_FLAG(SI_CHEAPCLONE);
+ SI_FLAG(SI_CHILD);
+ SI_FLAG(SI_DEVOPEN);
+ SI_FLAG(SI_CONSOPEN);
+ SI_FLAG(SI_DUMPDEV);
+ SI_FLAG(SI_CANDELETE);
+ SI_FLAG(SI_CLONELIST);
+ db_printf("si_flags %s\n", buf);
+
+ flags = cdp->cdp_flags;
+#define CDP_FLAG(flag) do { \
+ if (flags & (flag)) { \
+ if (buf[0] != '\0') \
+ strlcat(buf, ", ", sizeof(buf)); \
+ strlcat(buf, (#flag) + 4, sizeof(buf)); \
+ flags &= ~(flag); \
+ } \
+} while (0)
+ buf[0] = '\0';
+ CDP_FLAG(CDP_ACTIVE);
+ CDP_FLAG(CDP_SCHED_DTR);
+ db_printf("cdp_flags %s\n", buf);
+}
+#endif
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