/*- * 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 __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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 struct cdev *make_dev_credv(int flags, 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); 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) { struct cdevsw *csw; struct cdev_priv *cdp; mtx_assert(&devmtx, MA_NOTOWNED); 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(); return (csw); } struct cdevsw * devvn_refthread(struct vnode *vp, struct cdev **devp) { struct cdevsw *csw; struct cdev_priv *cdp; mtx_assert(&devmtx, MA_NOTOWNED); csw = NULL; dev_lock(); *devp = vp->v_rdev; if (*devp != NULL) { cdp = cdev2priv(*devp); if ((cdp->cdp_flags & CDP_SCHED_DTR) == 0) { csw = (*devp)->si_devsw; if (csw != NULL) (*devp)->si_threadcount++; } } dev_unlock(); return (csw); } void dev_relthread(struct cdev *dev) { mtx_assert(&devmtx, MA_NOTOWNED); 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_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */ .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 retval; dsw = dev_refthread(dev); if (dsw == NULL) return (ENXIO); mtx_lock(&Giant); retval = dsw->d_gianttrick->d_open(dev, oflags, devtype, td); mtx_unlock(&Giant); dev_relthread(dev); return (retval); } static int giant_fdopen(struct cdev *dev, int oflags, struct thread *td, struct file *fp) { struct cdevsw *dsw; int retval; dsw = dev_refthread(dev); if (dsw == NULL) return (ENXIO); mtx_lock(&Giant); retval = dsw->d_gianttrick->d_fdopen(dev, oflags, td, fp); mtx_unlock(&Giant); dev_relthread(dev); return (retval); } static int giant_close(struct cdev *dev, int fflag, int devtype, struct thread *td) { struct cdevsw *dsw; int retval; dsw = dev_refthread(dev); if (dsw == NULL) return (ENXIO); mtx_lock(&Giant); retval = dsw->d_gianttrick->d_close(dev, fflag, devtype, td); mtx_unlock(&Giant); dev_relthread(dev); return (retval); } static void giant_strategy(struct bio *bp) { struct cdevsw *dsw; struct cdev *dev; dev = bp->bio_dev; dsw = dev_refthread(dev); if (dsw == NULL) { biofinish(bp, NULL, ENXIO); return; } mtx_lock(&Giant); dsw->d_gianttrick->d_strategy(bp); mtx_unlock(&Giant); dev_relthread(dev); } static int giant_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) { struct cdevsw *dsw; int retval; dsw = dev_refthread(dev); 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); return (retval); } static int giant_read(struct cdev *dev, struct uio *uio, int ioflag) { struct cdevsw *dsw; int retval; dsw = dev_refthread(dev); if (dsw == NULL) return (ENXIO); mtx_lock(&Giant); retval = dsw->d_gianttrick->d_read(dev, uio, ioflag); mtx_unlock(&Giant); dev_relthread(dev); return (retval); } static int giant_write(struct cdev *dev, struct uio *uio, int ioflag) { struct cdevsw *dsw; int retval; dsw = dev_refthread(dev); if (dsw == NULL) return (ENXIO); mtx_lock(&Giant); retval = dsw->d_gianttrick->d_write(dev, uio, ioflag); mtx_unlock(&Giant); dev_relthread(dev); return (retval); } static int giant_poll(struct cdev *dev, int events, struct thread *td) { struct cdevsw *dsw; int retval; dsw = dev_refthread(dev); if (dsw == NULL) return (ENXIO); mtx_lock(&Giant); retval = dsw->d_gianttrick->d_poll(dev, events, td); mtx_unlock(&Giant); dev_relthread(dev); return (retval); } static int giant_kqfilter(struct cdev *dev, struct knote *kn) { struct cdevsw *dsw; int retval; dsw = dev_refthread(dev); if (dsw == NULL) return (ENXIO); mtx_lock(&Giant); retval = dsw->d_gianttrick->d_kqfilter(dev, kn); mtx_unlock(&Giant); dev_relthread(dev); 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 retval; dsw = dev_refthread(dev); 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); 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 retval; dsw = dev_refthread(dev); 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); return (retval); } static void notify(struct cdev *dev, const char *ev, int flags) { static const char prefix[] = "cdev="; char *data; int namelen; if (cold) return; namelen = strlen(dev->si_name); data = malloc(namelen + sizeof(prefix), M_TEMP, (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK); if (data == NULL) return; memcpy(data, prefix, sizeof(prefix) - 1); memcpy(data + sizeof(prefix) - 1, dev->si_name, namelen + 1); devctl_notify("DEVFS", "CDEV", ev, data); 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 (1); 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 (0); } else dsw2 = NULL; if (devsw->d_flags & D_INIT) { if (dsw2 != NULL) cdevsw_free_devlocked(dsw2); return (1); } 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 (1); } static struct cdev * make_dev_credv(int flags, 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; int i; dev = devfs_alloc(flags); if (dev == NULL) return (NULL); dev_lock(); if (!prep_cdevsw(devsw, flags)) { dev_unlock(); devfs_free(dev); return (NULL); } dev = newdev(devsw, unit, dev); if (flags & MAKEDEV_REF) dev_refl(dev); 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(); return (dev); } 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))); i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); if (i > (sizeof dev->__si_namebuf - 1)) { printf("WARNING: Device name truncated! (%s)\n", dev->__si_namebuf); } 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); return (dev); } 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; va_start(ap, fmt); dev = make_dev_credv(0, devsw, unit, NULL, uid, gid, mode, fmt, ap); va_end(ap); 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; va_start(ap, fmt); dev = make_dev_credv(0, devsw, unit, cr, uid, gid, mode, fmt, ap); va_end(ap); 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; va_start(ap, fmt); dev = make_dev_credv(flags, devsw, unit, cr, uid, gid, mode, fmt, ap); va_end(ap); return (dev); } 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(); } struct cdev * make_dev_alias(struct cdev *pdev, const char *fmt, ...) { struct cdev *dev; va_list ap; int i; KASSERT(pdev != NULL, ("NULL pdev")); dev = devfs_alloc(MAKEDEV_WAITOK); dev_lock(); dev->si_flags |= SI_ALIAS; dev->si_flags |= SI_NAMED; va_start(ap, fmt); i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap); if (i > (sizeof dev->__si_namebuf - 1)) { printf("WARNING: Device name truncated! (%s)\n", dev->__si_namebuf); } va_end(ap); devfs_create(dev); dev_dependsl(pdev, dev); clean_unrhdrl(devfs_inos); dev_unlock(); notify_create(dev, MAKEDEV_WAITOK); return (dev); } static void destroy_devl(struct cdev *dev) { struct cdevsw *csw; struct cdev_privdata *p, *p1; mtx_assert(&devmtx, MA_OWNED); KASSERT(dev->si_flags & SI_NAMED, ("WARNING: Driver mistake: destroy_dev on %d\n", dev2unit(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; } dev->si_refcount++; /* Avoid race with dev_rel() */ 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(); notify_destroy(dev); mtx_lock(&cdevpriv_mtx); LIST_FOREACH_SAFE(p, &cdev2priv(dev)->cdp_fdpriv, cdpd_list, p1) { 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; dev->si_refcount--; /* Avoid race with dev_rel() */ if (dev->si_refcount > 0) { LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list); } else { dev_free_devlocked(dev); } } 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);