1565 lines
35 KiB
C
1565 lines
35 KiB
C
/*-
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* Copyright (c) 1999-2002 Poul-Henning Kamp
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/bio.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/module.h>
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#include <sys/malloc.h>
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#include <sys/conf.h>
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#include <sys/vnode.h>
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#include <sys/queue.h>
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#include <sys/poll.h>
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#include <sys/sx.h>
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#include <sys/ctype.h>
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#include <sys/ucred.h>
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#include <sys/taskqueue.h>
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#include <machine/stdarg.h>
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#include <fs/devfs/devfs_int.h>
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#include <vm/vm.h>
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static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage");
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struct mtx devmtx;
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static void destroy_devl(struct cdev *dev);
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static int destroy_dev_sched_cbl(struct cdev *dev,
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void (*cb)(void *), void *arg);
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static void destroy_dev_tq(void *ctx, int pending);
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static int make_dev_credv(int flags, struct cdev **dres, struct cdevsw *devsw,
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int unit, struct ucred *cr, uid_t uid, gid_t gid, int mode, const char *fmt,
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va_list ap);
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static struct cdev_priv_list cdevp_free_list =
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TAILQ_HEAD_INITIALIZER(cdevp_free_list);
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static SLIST_HEAD(free_cdevsw, cdevsw) cdevsw_gt_post_list =
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SLIST_HEAD_INITIALIZER(cdevsw_gt_post_list);
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void
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dev_lock(void)
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{
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mtx_lock(&devmtx);
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}
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/*
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* Free all the memory collected while the cdev mutex was
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* locked. Since devmtx is after the system map mutex, free() cannot
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* be called immediately and is postponed until cdev mutex can be
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* dropped.
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*/
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static void
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dev_unlock_and_free(void)
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{
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struct cdev_priv_list cdp_free;
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struct free_cdevsw csw_free;
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struct cdev_priv *cdp;
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struct cdevsw *csw;
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mtx_assert(&devmtx, MA_OWNED);
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/*
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* Make the local copy of the list heads while the dev_mtx is
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* held. Free it later.
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*/
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TAILQ_INIT(&cdp_free);
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TAILQ_CONCAT(&cdp_free, &cdevp_free_list, cdp_list);
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csw_free = cdevsw_gt_post_list;
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SLIST_INIT(&cdevsw_gt_post_list);
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mtx_unlock(&devmtx);
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while ((cdp = TAILQ_FIRST(&cdp_free)) != NULL) {
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TAILQ_REMOVE(&cdp_free, cdp, cdp_list);
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devfs_free(&cdp->cdp_c);
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}
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while ((csw = SLIST_FIRST(&csw_free)) != NULL) {
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SLIST_REMOVE_HEAD(&csw_free, d_postfree_list);
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free(csw, M_DEVT);
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}
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}
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static void
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dev_free_devlocked(struct cdev *cdev)
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{
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struct cdev_priv *cdp;
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mtx_assert(&devmtx, MA_OWNED);
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cdp = cdev2priv(cdev);
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KASSERT((cdp->cdp_flags & CDP_UNREF_DTR) == 0,
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("destroy_dev() was not called after delist_dev(%p)", cdev));
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TAILQ_INSERT_HEAD(&cdevp_free_list, cdp, cdp_list);
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}
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static void
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cdevsw_free_devlocked(struct cdevsw *csw)
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{
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mtx_assert(&devmtx, MA_OWNED);
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SLIST_INSERT_HEAD(&cdevsw_gt_post_list, csw, d_postfree_list);
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}
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void
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dev_unlock(void)
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{
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mtx_unlock(&devmtx);
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}
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void
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dev_ref(struct cdev *dev)
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{
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mtx_assert(&devmtx, MA_NOTOWNED);
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mtx_lock(&devmtx);
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dev->si_refcount++;
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mtx_unlock(&devmtx);
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}
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void
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dev_refl(struct cdev *dev)
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{
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mtx_assert(&devmtx, MA_OWNED);
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dev->si_refcount++;
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}
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void
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dev_rel(struct cdev *dev)
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{
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int flag = 0;
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mtx_assert(&devmtx, MA_NOTOWNED);
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dev_lock();
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dev->si_refcount--;
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KASSERT(dev->si_refcount >= 0,
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("dev_rel(%s) gave negative count", devtoname(dev)));
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#if 0
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if (dev->si_usecount == 0 &&
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(dev->si_flags & SI_CHEAPCLONE) && (dev->si_flags & SI_NAMED))
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;
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else
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#endif
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if (dev->si_devsw == NULL && dev->si_refcount == 0) {
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LIST_REMOVE(dev, si_list);
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flag = 1;
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}
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dev_unlock();
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if (flag)
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devfs_free(dev);
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}
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struct cdevsw *
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dev_refthread(struct cdev *dev, int *ref)
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{
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struct cdevsw *csw;
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struct cdev_priv *cdp;
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mtx_assert(&devmtx, MA_NOTOWNED);
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if ((dev->si_flags & SI_ETERNAL) != 0) {
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*ref = 0;
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return (dev->si_devsw);
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}
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dev_lock();
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csw = dev->si_devsw;
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if (csw != NULL) {
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cdp = cdev2priv(dev);
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if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0)
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atomic_add_long(&dev->si_threadcount, 1);
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else
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csw = NULL;
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}
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dev_unlock();
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*ref = 1;
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return (csw);
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}
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struct cdevsw *
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devvn_refthread(struct vnode *vp, struct cdev **devp, int *ref)
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{
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struct cdevsw *csw;
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struct cdev_priv *cdp;
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struct cdev *dev;
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mtx_assert(&devmtx, MA_NOTOWNED);
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if ((vp->v_vflag & VV_ETERNALDEV) != 0) {
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dev = vp->v_rdev;
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if (dev == NULL)
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return (NULL);
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KASSERT((dev->si_flags & SI_ETERNAL) != 0,
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("Not eternal cdev"));
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*ref = 0;
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csw = dev->si_devsw;
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KASSERT(csw != NULL, ("Eternal cdev is destroyed"));
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*devp = dev;
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return (csw);
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}
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csw = NULL;
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dev_lock();
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dev = vp->v_rdev;
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if (dev == NULL) {
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dev_unlock();
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return (NULL);
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}
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cdp = cdev2priv(dev);
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if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) {
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csw = dev->si_devsw;
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if (csw != NULL)
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atomic_add_long(&dev->si_threadcount, 1);
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}
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dev_unlock();
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if (csw != NULL) {
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*devp = dev;
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*ref = 1;
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}
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return (csw);
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}
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void
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dev_relthread(struct cdev *dev, int ref)
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{
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mtx_assert(&devmtx, MA_NOTOWNED);
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if (!ref)
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return;
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KASSERT(dev->si_threadcount > 0,
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("%s threadcount is wrong", dev->si_name));
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atomic_subtract_rel_long(&dev->si_threadcount, 1);
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}
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int
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nullop(void)
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{
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return (0);
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}
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int
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eopnotsupp(void)
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{
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return (EOPNOTSUPP);
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}
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static int
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enxio(void)
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{
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return (ENXIO);
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}
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static int
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enodev(void)
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{
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return (ENODEV);
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}
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/* Define a dead_cdevsw for use when devices leave unexpectedly. */
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#define dead_open (d_open_t *)enxio
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#define dead_close (d_close_t *)enxio
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#define dead_read (d_read_t *)enxio
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#define dead_write (d_write_t *)enxio
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#define dead_ioctl (d_ioctl_t *)enxio
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#define dead_poll (d_poll_t *)enodev
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#define dead_mmap (d_mmap_t *)enodev
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static void
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dead_strategy(struct bio *bp)
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{
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biofinish(bp, NULL, ENXIO);
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}
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#define dead_dump (dumper_t *)enxio
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#define dead_kqfilter (d_kqfilter_t *)enxio
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#define dead_mmap_single (d_mmap_single_t *)enodev
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static struct cdevsw dead_cdevsw = {
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.d_version = D_VERSION,
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.d_open = dead_open,
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.d_close = dead_close,
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.d_read = dead_read,
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.d_write = dead_write,
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.d_ioctl = dead_ioctl,
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.d_poll = dead_poll,
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.d_mmap = dead_mmap,
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.d_strategy = dead_strategy,
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.d_name = "dead",
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.d_dump = dead_dump,
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.d_kqfilter = dead_kqfilter,
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.d_mmap_single = dead_mmap_single
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};
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/* Default methods if driver does not specify method */
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#define null_open (d_open_t *)nullop
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#define null_close (d_close_t *)nullop
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#define no_read (d_read_t *)enodev
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#define no_write (d_write_t *)enodev
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#define no_ioctl (d_ioctl_t *)enodev
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#define no_mmap (d_mmap_t *)enodev
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#define no_kqfilter (d_kqfilter_t *)enodev
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#define no_mmap_single (d_mmap_single_t *)enodev
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static void
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no_strategy(struct bio *bp)
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{
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biofinish(bp, NULL, ENODEV);
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}
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static int
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no_poll(struct cdev *dev __unused, int events, struct thread *td __unused)
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{
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return (poll_no_poll(events));
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}
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#define no_dump (dumper_t *)enodev
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static int
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giant_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
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{
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struct cdevsw *dsw;
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int ref, retval;
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dsw = dev_refthread(dev, &ref);
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if (dsw == NULL)
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return (ENXIO);
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mtx_lock(&Giant);
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retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td);
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mtx_unlock(&Giant);
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dev_relthread(dev, ref);
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return (retval);
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}
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static int
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giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp)
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{
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struct cdevsw *dsw;
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int ref, retval;
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dsw = dev_refthread(dev, &ref);
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if (dsw == NULL)
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return (ENXIO);
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mtx_lock(&Giant);
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retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp);
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mtx_unlock(&Giant);
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dev_relthread(dev, ref);
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return (retval);
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}
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static int
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giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
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{
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struct cdevsw *dsw;
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int ref, retval;
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dsw = dev_refthread(dev, &ref);
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if (dsw == NULL)
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return (ENXIO);
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mtx_lock(&Giant);
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retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td);
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mtx_unlock(&Giant);
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dev_relthread(dev, ref);
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return (retval);
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}
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static void
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giant_strategy(struct bio *bp)
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{
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struct cdevsw *dsw;
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struct cdev *dev;
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int ref;
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dev = bp->bio_dev;
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dsw = dev_refthread(dev, &ref);
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if (dsw == NULL) {
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biofinish(bp, NULL, ENXIO);
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return;
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}
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mtx_lock(&Giant);
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dsw->d_gianttrick->d_strategy(bp);
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mtx_unlock(&Giant);
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dev_relthread(dev, ref);
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}
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static int
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giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
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{
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struct cdevsw *dsw;
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int ref, retval;
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dsw = dev_refthread(dev, &ref);
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if (dsw == NULL)
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return (ENXIO);
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mtx_lock(&Giant);
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retval = dsw->d_gianttrick->d_ioctl(dev, cmd, data, fflag, td);
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mtx_unlock(&Giant);
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dev_relthread(dev, ref);
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return (retval);
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}
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static int
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giant_read(struct cdev *dev, struct uio *uio, int ioflag)
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{
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struct cdevsw *dsw;
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int ref, retval;
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dsw = dev_refthread(dev, &ref);
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if (dsw == NULL)
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return (ENXIO);
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mtx_lock(&Giant);
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retval = dsw->d_gianttrick->d_read(dev, uio, ioflag);
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mtx_unlock(&Giant);
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dev_relthread(dev, ref);
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return (retval);
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}
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static int
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giant_write(struct cdev *dev, struct uio *uio, int ioflag)
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{
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struct cdevsw *dsw;
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int ref, retval;
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dsw = dev_refthread(dev, &ref);
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if (dsw == NULL)
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return (ENXIO);
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mtx_lock(&Giant);
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retval = dsw->d_gianttrick->d_write(dev, uio, ioflag);
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mtx_unlock(&Giant);
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dev_relthread(dev, ref);
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return (retval);
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}
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static int
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giant_poll(struct cdev *dev, int events, struct thread *td)
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{
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struct cdevsw *dsw;
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int ref, retval;
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dsw = dev_refthread(dev, &ref);
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if (dsw == NULL)
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return (ENXIO);
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mtx_lock(&Giant);
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retval = dsw->d_gianttrick->d_poll(dev, events, td);
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mtx_unlock(&Giant);
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dev_relthread(dev, ref);
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return (retval);
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}
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static int
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giant_kqfilter(struct cdev *dev, struct knote *kn)
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{
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struct cdevsw *dsw;
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int ref, retval;
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dsw = dev_refthread(dev, &ref);
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if (dsw == NULL)
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return (ENXIO);
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mtx_lock(&Giant);
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retval = dsw->d_gianttrick->d_kqfilter(dev, kn);
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mtx_unlock(&Giant);
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dev_relthread(dev, ref);
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return (retval);
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}
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static int
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giant_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot,
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vm_memattr_t *memattr)
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{
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struct cdevsw *dsw;
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int ref, retval;
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dsw = dev_refthread(dev, &ref);
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if (dsw == NULL)
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return (ENXIO);
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mtx_lock(&Giant);
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retval = dsw->d_gianttrick->d_mmap(dev, offset, paddr, nprot,
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memattr);
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mtx_unlock(&Giant);
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dev_relthread(dev, ref);
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return (retval);
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}
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static int
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giant_mmap_single(struct cdev *dev, vm_ooffset_t *offset, vm_size_t size,
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vm_object_t *object, int nprot)
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{
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struct cdevsw *dsw;
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int ref, retval;
|
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dsw = dev_refthread(dev, &ref);
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if (dsw == NULL)
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return (ENXIO);
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mtx_lock(&Giant);
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retval = dsw->d_gianttrick->d_mmap_single(dev, offset, size, object,
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nprot);
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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 make_dev_args *args, struct cdev *si)
|
|
{
|
|
struct cdev *si2;
|
|
struct cdevsw *csw;
|
|
|
|
mtx_assert(&devmtx, MA_OWNED);
|
|
csw = args->mda_devsw;
|
|
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) == args->mda_unit) {
|
|
dev_free_devlocked(si);
|
|
return (si2);
|
|
}
|
|
}
|
|
}
|
|
si->si_drv0 = args->mda_unit;
|
|
si->si_devsw = csw;
|
|
si->si_drv1 = args->mda_si_drv1;
|
|
si->si_drv2 = args->mda_si_drv2;
|
|
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_name, sizeof(dev->si_name), 32, fmt, ap);
|
|
if (len > sizeof(dev->si_name) - 1)
|
|
return (ENAMETOOLONG);
|
|
|
|
/* Strip leading slashes. */
|
|
for (from = dev->si_name; *from == '/'; from++)
|
|
;
|
|
|
|
for (to = dev->si_name; *from != '\0'; from++, to++) {
|
|
/*
|
|
* Spaces and double quotation marks cause
|
|
* problems for the devctl(4) protocol.
|
|
* Reject names containing those characters.
|
|
*/
|
|
if (isspace(*from) || *from == '"')
|
|
return (EINVAL);
|
|
/* 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_name[0] == '\0')
|
|
return (EINVAL);
|
|
|
|
/* Disallow "." and ".." components. */
|
|
for (s = dev->si_name;;) {
|
|
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_name) != 0)
|
|
return (EEXIST);
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
make_dev_args_init_impl(struct make_dev_args *args, size_t sz)
|
|
{
|
|
|
|
bzero(args, sz);
|
|
args->mda_size = sz;
|
|
}
|
|
|
|
static int
|
|
make_dev_sv(struct make_dev_args *args1, struct cdev **dres,
|
|
const char *fmt, va_list ap)
|
|
{
|
|
struct cdev *dev, *dev_new;
|
|
struct make_dev_args args;
|
|
int res;
|
|
|
|
bzero(&args, sizeof(args));
|
|
if (sizeof(args) < args1->mda_size)
|
|
return (EINVAL);
|
|
bcopy(args1, &args, args1->mda_size);
|
|
KASSERT((args.mda_flags & MAKEDEV_WAITOK) == 0 ||
|
|
(args.mda_flags & MAKEDEV_NOWAIT) == 0,
|
|
("make_dev_sv: both WAITOK and NOWAIT specified"));
|
|
dev_new = devfs_alloc(args.mda_flags);
|
|
if (dev_new == NULL)
|
|
return (ENOMEM);
|
|
dev_lock();
|
|
res = prep_cdevsw(args.mda_devsw, args.mda_flags);
|
|
if (res != 0) {
|
|
dev_unlock();
|
|
devfs_free(dev_new);
|
|
return (res);
|
|
}
|
|
dev = newdev(&args, dev_new);
|
|
if ((dev->si_flags & SI_NAMED) == 0) {
|
|
res = prep_devname(dev, fmt, ap);
|
|
if (res != 0) {
|
|
if ((args.mda_flags & MAKEDEV_CHECKNAME) == 0) {
|
|
panic(
|
|
"make_dev_sv: 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 ((args.mda_flags & MAKEDEV_REF) != 0)
|
|
dev_refl(dev);
|
|
if ((args.mda_flags & MAKEDEV_ETERNAL) != 0)
|
|
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)",
|
|
args.mda_devsw->d_name, dev2unit(dev), devtoname(dev)));
|
|
dev->si_flags |= SI_NAMED;
|
|
if (args.mda_cr != NULL)
|
|
dev->si_cred = crhold(args.mda_cr);
|
|
dev->si_uid = args.mda_uid;
|
|
dev->si_gid = args.mda_gid;
|
|
dev->si_mode = args.mda_mode;
|
|
|
|
devfs_create(dev);
|
|
clean_unrhdrl(devfs_inos);
|
|
dev_unlock_and_free();
|
|
|
|
notify_create(dev, args.mda_flags);
|
|
|
|
*dres = dev;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
make_dev_s(struct make_dev_args *args, struct cdev **dres,
|
|
const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int res;
|
|
|
|
va_start(ap, fmt);
|
|
res = make_dev_sv(args, dres, fmt, ap);
|
|
va_end(ap);
|
|
return (res);
|
|
}
|
|
|
|
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 make_dev_args args;
|
|
|
|
make_dev_args_init(&args);
|
|
args.mda_flags = flags;
|
|
args.mda_devsw = devsw;
|
|
args.mda_cr = cr;
|
|
args.mda_uid = uid;
|
|
args.mda_gid = gid;
|
|
args.mda_mode = mode;
|
|
args.mda_unit = unit;
|
|
return (make_dev_sv(&args, dres, fmt, ap));
|
|
}
|
|
|
|
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;
|
|
struct make_dev_args args;
|
|
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;
|
|
make_dev_args_init(&args);
|
|
args.mda_unit = unit | extra;
|
|
args.mda_devsw = csw;
|
|
dev = newdev(&args, 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 %jx unit %x",
|
|
(uintmax_t)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 = TASK_INITIALIZER(0, destroy_dev_tq, NULL);
|
|
|
|
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);
|
|
}
|
|
|
|
#include "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_DUMPDEV);
|
|
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
|