1995-10-02 09:24:44 +00:00
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/*-
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2002-09-20 22:26:27 +00:00
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* Copyright (c) 1999-2002 Poul-Henning Kamp
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1995-10-02 09:24:44 +00:00
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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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2002-09-20 22:26:27 +00:00
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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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1995-10-02 09:24:44 +00:00
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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2002-09-20 22:26:27 +00:00
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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1995-10-02 09:24:44 +00:00
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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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2003-06-11 00:56:59 +00:00
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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1995-10-02 09:24:44 +00:00
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#include <sys/param.h>
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1999-07-20 09:47:55 +00:00
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#include <sys/kernel.h>
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1995-10-02 10:15:40 +00:00
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#include <sys/systm.h>
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2003-02-20 15:35:54 +00:00
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#include <sys/bio.h>
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2002-02-16 17:44:43 +00:00
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#include <sys/lock.h>
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#include <sys/mutex.h>
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2001-09-12 08:38:13 +00:00
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#include <sys/sysctl.h>
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1998-06-07 17:13:14 +00:00
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#include <sys/module.h>
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1999-07-20 09:47:55 +00:00
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#include <sys/malloc.h>
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1995-10-02 09:24:44 +00:00
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#include <sys/conf.h>
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1995-12-21 20:09:46 +00:00
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#include <sys/vnode.h>
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1999-07-20 09:47:55 +00:00
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#include <sys/queue.h>
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2003-09-27 12:53:33 +00:00
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#include <sys/poll.h>
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2000-09-02 19:17:34 +00:00
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#include <sys/ctype.h>
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2004-02-21 20:41:11 +00:00
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#include <sys/tty.h>
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1999-08-08 18:43:05 +00:00
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#include <machine/stdarg.h>
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1995-12-21 20:09:46 +00:00
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2004-07-11 19:26:43 +00:00
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static MALLOC_DEFINE(M_DEVT, "cdev", "cdev storage");
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1999-07-20 09:47:55 +00:00
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2003-02-27 14:46:51 +00:00
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/* Built at compile time from sys/conf/majors */
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2004-02-21 21:57:26 +00:00
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static struct mtx devmtx;
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2004-06-16 09:47:26 +00:00
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static void freedev(struct cdev *dev);
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2005-02-22 15:51:07 +00:00
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static void destroy_devl(struct cdev *dev);
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2004-06-17 17:16:53 +00:00
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2004-09-23 07:17:41 +00:00
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void
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dev_lock(void)
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2004-02-21 21:57:26 +00:00
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{
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if (!mtx_initialized(&devmtx))
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2004-07-11 19:26:43 +00:00
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mtx_init(&devmtx, "cdev", NULL, MTX_DEF);
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2004-02-21 21:57:26 +00:00
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mtx_lock(&devmtx);
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}
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2004-09-23 07:17:41 +00:00
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void
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dev_unlock(void)
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2004-02-21 21:57:26 +00:00
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{
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2004-09-24 05:54:32 +00:00
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2004-02-21 21:57:26 +00:00
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mtx_unlock(&devmtx);
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}
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void
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2004-06-16 09:47:26 +00:00
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dev_ref(struct cdev *dev)
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2004-02-21 21:57:26 +00:00
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{
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2004-09-24 05:54:32 +00:00
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2005-02-22 14:41:04 +00:00
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mtx_assert(&devmtx, MA_OWNED);
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2004-02-21 21:57:26 +00:00
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dev->si_refcount++;
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}
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void
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2005-02-22 15:51:07 +00:00
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dev_rel(struct cdev *dev)
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2004-02-21 21:57:26 +00:00
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{
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2005-02-22 15:51:07 +00:00
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int flag = 0;
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2004-09-23 07:17:41 +00:00
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2004-10-01 06:33:39 +00:00
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mtx_assert(&devmtx, MA_NOTOWNED);
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dev_lock();
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2004-02-21 21:57:26 +00:00
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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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2005-02-22 15:51:07 +00:00
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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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2004-02-21 21:57:26 +00:00
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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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2004-10-01 06:33:39 +00:00
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flag = 1;
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2004-02-21 21:57:26 +00:00
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}
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2004-10-01 06:33:39 +00:00
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dev_unlock();
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if (flag)
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freedev(dev);
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2004-02-21 21:57:26 +00:00
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}
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2004-10-01 06:33:39 +00:00
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2004-09-24 05:54:32 +00:00
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struct cdevsw *
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dev_refthread(struct cdev *dev)
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{
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struct cdevsw *csw;
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mtx_assert(&devmtx, MA_NOTOWNED);
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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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dev->si_threadcount++;
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dev_unlock();
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return (csw);
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}
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void
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dev_relthread(struct cdev *dev)
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{
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mtx_assert(&devmtx, MA_NOTOWNED);
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dev_lock();
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dev->si_threadcount--;
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dev_unlock();
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}
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2004-02-21 21:57:26 +00:00
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2003-09-27 12:53:33 +00:00
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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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2003-02-20 15:35:54 +00:00
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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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2003-09-27 12:53:33 +00:00
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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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2003-02-20 15:35:54 +00:00
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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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2003-09-27 12:53:33 +00:00
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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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2003-02-20 15:35:54 +00:00
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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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2003-02-21 19:00:48 +00:00
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#define dead_dump (dumper_t *)enxio
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2003-02-20 15:35:54 +00:00
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#define dead_kqfilter (d_kqfilter_t *)enxio
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static struct cdevsw dead_cdevsw = {
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2004-02-21 21:10:55 +00:00
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.d_version = D_VERSION,
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.d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */
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2003-03-03 12:15:54 +00:00
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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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2003-02-20 15:35:54 +00:00
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};
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2003-09-27 12:53:33 +00:00
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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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2004-08-15 06:24:42 +00:00
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#define no_kqfilter (d_kqfilter_t *)enodev
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2003-09-27 12:53:33 +00:00
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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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2004-06-16 09:47:26 +00:00
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no_poll(struct cdev *dev __unused, int events, struct thread *td __unused)
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2003-09-27 12:53:33 +00:00
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{
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/*
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* Return true for read/write. If the user asked for something
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* special, return POLLNVAL, so that clients have a way of
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* determining reliably whether or not the extended
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* functionality is present without hard-coding knowledge
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* of specific filesystem implementations.
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* Stay in sync with vop_nopoll().
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*/
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if (events & ~POLLSTANDARD)
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return (POLLNVAL);
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return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
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}
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#define no_dump (dumper_t *)enodev
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2001-10-27 17:44:21 +00:00
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Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
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/*
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2004-06-22 20:22:24 +00:00
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* struct cdev * and u_dev_t primitives
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
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|
*/
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int
|
2004-06-16 09:47:26 +00:00
|
|
|
minor(struct cdev *x)
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
{
|
2004-06-17 17:16:53 +00:00
|
|
|
if (x == NULL)
|
|
|
|
return NODEV;
|
2005-03-15 11:33:28 +00:00
|
|
|
return(x->si_drv0 & MAXMINOR);
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
}
|
|
|
|
|
1999-08-15 09:32:47 +00:00
|
|
|
int
|
2004-06-16 09:47:26 +00:00
|
|
|
dev2unit(struct cdev *x)
|
1999-08-15 09:32:47 +00:00
|
|
|
{
|
|
|
|
|
2004-06-17 17:16:53 +00:00
|
|
|
if (x == NULL)
|
|
|
|
return NODEV;
|
2005-01-29 15:10:30 +00:00
|
|
|
return (minor2unit(minor(x)));
|
2005-01-29 15:07:13 +00:00
|
|
|
}
|
|
|
|
|
2005-03-08 10:40:03 +00:00
|
|
|
u_int
|
|
|
|
minor2unit(u_int _minor)
|
2005-01-29 15:07:13 +00:00
|
|
|
{
|
|
|
|
|
2005-01-29 16:50:04 +00:00
|
|
|
KASSERT((_minor & ~MAXMINOR) == 0, ("Illegal minor %x", _minor));
|
2005-03-08 10:40:03 +00:00
|
|
|
return ((_minor & 0xff) | ((_minor >> 8) & 0xffff00));
|
1999-08-15 09:32:47 +00:00
|
|
|
}
|
|
|
|
|
2000-09-19 10:28:44 +00:00
|
|
|
int
|
|
|
|
unit2minor(int unit)
|
|
|
|
{
|
|
|
|
|
2001-03-20 13:24:24 +00:00
|
|
|
KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit));
|
2000-09-19 10:28:44 +00:00
|
|
|
return ((unit & 0xff) | ((unit << 8) & ~0xffff));
|
|
|
|
}
|
|
|
|
|
2004-06-16 09:47:26 +00:00
|
|
|
static struct cdev *
|
2000-08-20 21:34:39 +00:00
|
|
|
allocdev(void)
|
|
|
|
{
|
2002-09-27 18:27:10 +00:00
|
|
|
struct cdev *si;
|
2000-08-20 21:34:39 +00:00
|
|
|
|
2004-10-25 13:12:06 +00:00
|
|
|
si = malloc(sizeof *si, M_DEVT, M_USE_RESERVE | M_ZERO | M_WAITOK);
|
2003-02-04 10:32:40 +00:00
|
|
|
si->si_name = si->__si_namebuf;
|
2001-05-26 08:27:58 +00:00
|
|
|
LIST_INIT(&si->si_children);
|
2005-02-22 15:51:07 +00:00
|
|
|
LIST_INIT(&si->si_alist);
|
2000-08-20 21:34:39 +00:00
|
|
|
return (si);
|
|
|
|
}
|
|
|
|
|
2004-06-16 09:47:26 +00:00
|
|
|
static struct cdev *
|
2005-03-29 09:56:21 +00:00
|
|
|
newdev(struct cdevsw *csw, int y, struct cdev *si)
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
{
|
2005-01-24 12:44:56 +00:00
|
|
|
struct cdev *si2;
|
2004-06-17 17:16:53 +00:00
|
|
|
dev_t udev;
|
1999-07-20 09:47:55 +00:00
|
|
|
|
2005-01-24 12:44:56 +00:00
|
|
|
mtx_assert(&devmtx, MA_OWNED);
|
2005-03-29 11:15:54 +00:00
|
|
|
udev = y;
|
2005-03-29 09:56:21 +00:00
|
|
|
LIST_FOREACH(si2, &csw->d_devs, si_list) {
|
2005-03-15 11:33:28 +00:00
|
|
|
if (si2->si_drv0 == udev) {
|
2005-01-24 12:44:56 +00:00
|
|
|
freedev(si);
|
|
|
|
return (si2);
|
|
|
|
}
|
1999-07-20 09:47:55 +00:00
|
|
|
}
|
2005-03-15 11:33:28 +00:00
|
|
|
si->si_drv0 = udev;
|
2005-03-29 09:56:21 +00:00
|
|
|
LIST_INSERT_HEAD(&csw->d_devs, si, si_list);
|
2004-02-15 20:14:47 +00:00
|
|
|
return (si);
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
}
|
|
|
|
|
2004-02-21 21:57:26 +00:00
|
|
|
static void
|
2004-06-16 09:47:26 +00:00
|
|
|
freedev(struct cdev *dev)
|
1999-08-29 09:09:12 +00:00
|
|
|
{
|
|
|
|
|
2004-10-25 13:12:06 +00:00
|
|
|
free(dev, M_DEVT);
|
1999-08-29 09:09:12 +00:00
|
|
|
}
|
|
|
|
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
int
|
2004-06-17 17:16:53 +00:00
|
|
|
uminor(dev_t dev)
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
{
|
2005-01-29 16:50:04 +00:00
|
|
|
return (dev & MAXMINOR);
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
int
|
2004-06-17 17:16:53 +00:00
|
|
|
umajor(dev_t dev)
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
{
|
2005-01-29 16:50:04 +00:00
|
|
|
return ((dev & ~MAXMINOR) >> 8);
|
Divorce "dev_t" from the "major|minor" bitmap, which is now called
udev_t in the kernel but still called dev_t in userland.
Provide functions to manipulate both types:
major() umajor()
minor() uminor()
makedev() umakedev()
dev2udev() udev2dev()
For now they're functions, they will become in-line functions
after one of the next two steps in this process.
Return major/minor/makedev to macro-hood for userland.
Register a name in cdevsw[] for the "filedescriptor" driver.
In the kernel the udev_t appears in places where we have the
major/minor number combination, (ie: a potential device: we
may not have the driver nor the device), like in inodes, vattr,
cdevsw registration and so on, whereas the dev_t appears where
we carry around a reference to a actual device.
In the future the cdevsw and the aliased-from vnode will be hung
directly from the dev_t, along with up to two softc pointers for
the device driver and a few houskeeping bits. This will essentially
replace the current "alias" check code (same buck, bigger bang).
A little stunt has been provided to try to catch places where the
wrong type is being used (dev_t vs udev_t), if you see something
not working, #undef DEVT_FASCIST in kern/kern_conf.c and see if
it makes a difference. If it does, please try to track it down
(many hands make light work) or at least try to reproduce it
as simply as possible, and describe how to do that.
Without DEVT_FASCIST I belive this patch is a no-op.
Stylistic/posixoid comments about the userland view of the <sys/*.h>
files welcome now, from userland they now contain the end result.
Next planned step: make all dev_t's refer to the same devsw[] which
means convert BLK's to CHR's at the perimeter of the vnodes and
other places where they enter the game (bootdev, mknod, sysctl).
1999-05-11 19:55:07 +00:00
|
|
|
}
|
|
|
|
|
2004-02-21 21:57:26 +00:00
|
|
|
static void
|
|
|
|
fini_cdevsw(struct cdevsw *devsw)
|
|
|
|
{
|
2005-03-29 11:15:54 +00:00
|
|
|
|
2004-02-23 08:42:55 +00:00
|
|
|
devsw->d_flags &= ~D_INIT;
|
2004-02-21 20:29:52 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
prep_cdevsw(struct cdevsw *devsw)
|
|
|
|
{
|
|
|
|
|
2004-09-23 07:17:41 +00:00
|
|
|
dev_lock();
|
2004-02-21 21:57:26 +00:00
|
|
|
|
2005-03-17 12:07:00 +00:00
|
|
|
if (devsw->d_version != D_VERSION_01) {
|
2004-02-21 21:57:26 +00:00
|
|
|
printf(
|
|
|
|
"WARNING: Device driver \"%s\" has wrong version %s\n",
|
|
|
|
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_strategy = dead_strategy;
|
|
|
|
devsw->d_dump = dead_dump;
|
|
|
|
devsw->d_kqfilter = dead_kqfilter;
|
|
|
|
}
|
|
|
|
|
2004-02-21 20:41:11 +00:00
|
|
|
if (devsw->d_flags & D_TTY) {
|
2004-06-01 13:39:02 +00:00
|
|
|
if (devsw->d_ioctl == NULL) devsw->d_ioctl = ttyioctl;
|
2004-02-21 20:41:11 +00:00
|
|
|
if (devsw->d_read == NULL) devsw->d_read = ttyread;
|
|
|
|
if (devsw->d_write == NULL) devsw->d_write = ttywrite;
|
|
|
|
if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = ttykqfilter;
|
|
|
|
if (devsw->d_poll == NULL) devsw->d_poll = ttypoll;
|
|
|
|
}
|
|
|
|
|
2003-09-27 12:53:33 +00:00
|
|
|
if (devsw->d_open == NULL) devsw->d_open = null_open;
|
|
|
|
if (devsw->d_close == NULL) devsw->d_close = null_close;
|
|
|
|
if (devsw->d_read == NULL) devsw->d_read = no_read;
|
|
|
|
if (devsw->d_write == NULL) devsw->d_write = no_write;
|
|
|
|
if (devsw->d_ioctl == NULL) devsw->d_ioctl = no_ioctl;
|
|
|
|
if (devsw->d_poll == NULL) devsw->d_poll = no_poll;
|
|
|
|
if (devsw->d_mmap == NULL) devsw->d_mmap = no_mmap;
|
|
|
|
if (devsw->d_strategy == NULL) devsw->d_strategy = no_strategy;
|
|
|
|
if (devsw->d_dump == NULL) devsw->d_dump = no_dump;
|
|
|
|
if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = no_kqfilter;
|
2004-02-21 21:57:26 +00:00
|
|
|
|
|
|
|
LIST_INIT(&devsw->d_devs);
|
|
|
|
|
|
|
|
devsw->d_flags |= D_INIT;
|
|
|
|
|
2004-09-23 07:17:41 +00:00
|
|
|
dev_unlock();
|
2004-02-15 10:35:33 +00:00
|
|
|
}
|
|
|
|
|
2004-06-16 09:47:26 +00:00
|
|
|
struct cdev *
|
2004-02-21 21:57:26 +00:00
|
|
|
make_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int perms, const char *fmt, ...)
|
2004-02-15 10:35:33 +00:00
|
|
|
{
|
2004-06-16 09:47:26 +00:00
|
|
|
struct cdev *dev;
|
2004-02-15 10:35:33 +00:00
|
|
|
va_list ap;
|
|
|
|
int i;
|
|
|
|
|
2005-01-29 16:50:04 +00:00
|
|
|
KASSERT((minornr & ~MAXMINOR) == 0,
|
2004-02-21 21:57:26 +00:00
|
|
|
("Invalid minor (0x%x) in make_dev", minornr));
|
|
|
|
|
2005-03-17 12:07:00 +00:00
|
|
|
if (!(devsw->d_flags & D_INIT)) {
|
2004-02-21 21:57:26 +00:00
|
|
|
prep_cdevsw(devsw);
|
2005-03-17 12:07:00 +00:00
|
|
|
if (devsw->d_uid == 0)
|
|
|
|
devsw->d_uid = uid;
|
|
|
|
if (devsw->d_gid == 0)
|
|
|
|
devsw->d_gid = gid;
|
|
|
|
if (devsw->d_mode == 0)
|
|
|
|
devsw->d_mode = perms;
|
|
|
|
}
|
2005-01-24 12:44:56 +00:00
|
|
|
dev = allocdev();
|
|
|
|
dev_lock();
|
2005-03-29 09:56:21 +00:00
|
|
|
dev = newdev(devsw, minornr, dev);
|
2003-09-27 21:50:00 +00:00
|
|
|
if (dev->si_flags & SI_CHEAPCLONE &&
|
|
|
|
dev->si_flags & SI_NAMED &&
|
|
|
|
dev->si_devsw == devsw) {
|
|
|
|
/*
|
|
|
|
* This is allowed as it removes races and generally
|
|
|
|
* simplifies cloning devices.
|
2004-02-21 21:57:26 +00:00
|
|
|
* XXX: still ??
|
2003-09-27 21:50:00 +00:00
|
|
|
*/
|
2005-01-24 12:44:56 +00:00
|
|
|
dev_unlock();
|
2003-09-27 21:50:00 +00:00
|
|
|
return (dev);
|
|
|
|
}
|
2004-02-21 21:57:26 +00:00
|
|
|
KASSERT(!(dev->si_flags & SI_NAMED),
|
2005-03-29 09:56:21 +00:00
|
|
|
("make_dev() by driver %s on pre-existing device (min=%x, name=%s)",
|
|
|
|
devsw->d_name, minor(dev), devtoname(dev)));
|
2004-02-21 21:57:26 +00:00
|
|
|
|
1999-08-08 18:43:05 +00:00
|
|
|
va_start(ap, fmt);
|
2003-02-04 11:04:26 +00:00
|
|
|
i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
|
|
|
|
if (i > (sizeof dev->__si_namebuf - 1)) {
|
2004-08-30 01:10:20 +00:00
|
|
|
printf("WARNING: Device name truncated! (%s)\n",
|
2003-02-04 11:04:26 +00:00
|
|
|
dev->__si_namebuf);
|
|
|
|
}
|
1999-08-08 18:43:05 +00:00
|
|
|
va_end(ap);
|
2004-10-25 13:12:06 +00:00
|
|
|
|
1999-08-08 18:43:05 +00:00
|
|
|
dev->si_devsw = devsw;
|
2000-09-11 17:15:33 +00:00
|
|
|
dev->si_flags |= SI_NAMED;
|
2000-08-20 21:34:39 +00:00
|
|
|
|
2003-03-02 13:35:30 +00:00
|
|
|
devfs_create(dev);
|
2004-09-23 07:17:41 +00:00
|
|
|
dev_unlock();
|
2000-08-20 21:34:39 +00:00
|
|
|
return (dev);
|
|
|
|
}
|
|
|
|
|
2001-10-17 18:47:12 +00:00
|
|
|
int
|
2004-06-16 09:47:26 +00:00
|
|
|
dev_named(struct cdev *pdev, const char *name)
|
2001-10-17 18:47:12 +00:00
|
|
|
{
|
2004-06-16 09:47:26 +00:00
|
|
|
struct cdev *cdev;
|
2001-10-17 18:47:12 +00:00
|
|
|
|
|
|
|
if (strcmp(devtoname(pdev), name) == 0)
|
|
|
|
return (1);
|
|
|
|
LIST_FOREACH(cdev, &pdev->si_children, si_siblings)
|
|
|
|
if (strcmp(devtoname(cdev), name) == 0)
|
|
|
|
return (1);
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
2001-05-26 08:27:58 +00:00
|
|
|
void
|
2004-06-16 09:47:26 +00:00
|
|
|
dev_depends(struct cdev *pdev, struct cdev *cdev)
|
2001-05-26 08:27:58 +00:00
|
|
|
{
|
|
|
|
|
2004-09-23 07:17:41 +00:00
|
|
|
dev_lock();
|
2001-05-26 08:27:58 +00:00
|
|
|
cdev->si_parent = pdev;
|
|
|
|
cdev->si_flags |= SI_CHILD;
|
|
|
|
LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
|
2004-09-23 07:17:41 +00:00
|
|
|
dev_unlock();
|
2001-05-26 08:27:58 +00:00
|
|
|
}
|
|
|
|
|
2004-06-16 09:47:26 +00:00
|
|
|
struct cdev *
|
|
|
|
make_dev_alias(struct cdev *pdev, const char *fmt, ...)
|
2000-08-20 21:34:39 +00:00
|
|
|
{
|
2004-06-16 09:47:26 +00:00
|
|
|
struct cdev *dev;
|
2000-08-20 21:34:39 +00:00
|
|
|
va_list ap;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
dev = allocdev();
|
2004-09-23 07:17:41 +00:00
|
|
|
dev_lock();
|
2000-08-20 21:34:39 +00:00
|
|
|
dev->si_flags |= SI_ALIAS;
|
2000-09-11 17:15:33 +00:00
|
|
|
dev->si_flags |= SI_NAMED;
|
2000-08-20 21:34:39 +00:00
|
|
|
va_start(ap, fmt);
|
2003-02-04 11:04:26 +00:00
|
|
|
i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
|
|
|
|
if (i > (sizeof dev->__si_namebuf - 1)) {
|
2004-08-30 01:10:20 +00:00
|
|
|
printf("WARNING: Device name truncated! (%s)\n",
|
2003-02-04 11:04:26 +00:00
|
|
|
dev->__si_namebuf);
|
|
|
|
}
|
2000-08-20 21:34:39 +00:00
|
|
|
va_end(ap);
|
1999-08-20 20:25:00 +00:00
|
|
|
|
2003-03-02 13:35:30 +00:00
|
|
|
devfs_create(dev);
|
2004-09-23 07:17:41 +00:00
|
|
|
dev_unlock();
|
2004-02-21 21:57:26 +00:00
|
|
|
dev_depends(pdev, dev);
|
1999-08-08 18:43:05 +00:00
|
|
|
return (dev);
|
|
|
|
}
|
|
|
|
|
2004-02-21 21:57:26 +00:00
|
|
|
static void
|
2005-02-22 15:51:07 +00:00
|
|
|
destroy_devl(struct cdev *dev)
|
1999-08-29 09:09:12 +00:00
|
|
|
{
|
2004-09-27 06:18:25 +00:00
|
|
|
struct cdevsw *csw;
|
|
|
|
|
2005-02-22 15:51:07 +00:00
|
|
|
mtx_assert(&devmtx, MA_OWNED);
|
2004-09-27 06:18:25 +00:00
|
|
|
KASSERT(dev->si_flags & SI_NAMED,
|
2005-03-29 09:56:21 +00:00
|
|
|
("WARNING: Driver mistake: destroy_dev on %d\n", minor(dev)));
|
2000-09-11 17:15:33 +00:00
|
|
|
|
2003-03-02 13:35:30 +00:00
|
|
|
devfs_destroy(dev);
|
2004-02-21 21:57:26 +00:00
|
|
|
|
|
|
|
/* Remove name marking */
|
2004-02-21 20:29:52 +00:00
|
|
|
dev->si_flags &= ~SI_NAMED;
|
|
|
|
|
2004-02-21 21:57:26 +00:00
|
|
|
/* If we are a child, remove us from the parents list */
|
2001-05-26 08:27:58 +00:00
|
|
|
if (dev->si_flags & SI_CHILD) {
|
|
|
|
LIST_REMOVE(dev, si_siblings);
|
|
|
|
dev->si_flags &= ~SI_CHILD;
|
|
|
|
}
|
2004-02-21 21:57:26 +00:00
|
|
|
|
|
|
|
/* Kill our children */
|
2001-05-26 08:27:58 +00:00
|
|
|
while (!LIST_EMPTY(&dev->si_children))
|
2005-02-22 15:51:07 +00:00
|
|
|
destroy_devl(LIST_FIRST(&dev->si_children));
|
2004-02-21 21:57:26 +00:00
|
|
|
|
|
|
|
/* Remove from clone list */
|
2004-02-21 20:29:52 +00:00
|
|
|
if (dev->si_flags & SI_CLONELIST) {
|
|
|
|
LIST_REMOVE(dev, si_clone);
|
|
|
|
dev->si_flags &= ~SI_CLONELIST;
|
|
|
|
}
|
2004-02-21 21:57:26 +00:00
|
|
|
|
2004-09-27 06:18:25 +00:00
|
|
|
csw = dev->si_devsw;
|
2004-09-29 16:38:38 +00:00
|
|
|
dev->si_devsw = NULL; /* already NULL for SI_ALIAS */
|
|
|
|
while (csw != NULL && csw->d_purge != NULL && dev->si_threadcount) {
|
2004-09-27 06:18:25 +00:00
|
|
|
printf("Purging %lu threads from %s\n",
|
|
|
|
dev->si_threadcount, devtoname(dev));
|
|
|
|
csw->d_purge(dev);
|
|
|
|
msleep(csw, &devmtx, PRIBIO, "devprg", hz/10);
|
|
|
|
}
|
2004-09-29 16:38:38 +00:00
|
|
|
if (csw != NULL && csw->d_purge != NULL)
|
2004-09-27 06:34:30 +00:00
|
|
|
printf("All threads purged from %s\n", devtoname(dev));
|
2004-09-27 06:18:25 +00:00
|
|
|
|
|
|
|
dev->si_drv1 = 0;
|
|
|
|
dev->si_drv2 = 0;
|
|
|
|
bzero(&dev->__si_u, sizeof(dev->__si_u));
|
|
|
|
|
2004-02-21 21:57:26 +00:00
|
|
|
if (!(dev->si_flags & SI_ALIAS)) {
|
|
|
|
/* Remove from cdevsw list */
|
|
|
|
LIST_REMOVE(dev, si_list);
|
|
|
|
|
2004-06-16 09:47:26 +00:00
|
|
|
/* If cdevsw has no struct cdev *'s, clean it */
|
2004-09-27 06:34:30 +00:00
|
|
|
if (LIST_EMPTY(&csw->d_devs))
|
|
|
|
fini_cdevsw(csw);
|
2004-02-21 21:57:26 +00:00
|
|
|
}
|
2000-09-11 17:15:33 +00:00
|
|
|
dev->si_flags &= ~SI_ALIAS;
|
2004-09-27 06:18:25 +00:00
|
|
|
|
2004-02-21 21:57:26 +00:00
|
|
|
if (dev->si_refcount > 0) {
|
|
|
|
LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
|
|
|
|
} else {
|
|
|
|
freedev(dev);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
2004-06-16 09:47:26 +00:00
|
|
|
destroy_dev(struct cdev *dev)
|
2004-02-21 21:57:26 +00:00
|
|
|
{
|
|
|
|
|
2004-09-23 07:17:41 +00:00
|
|
|
dev_lock();
|
2005-02-22 15:51:07 +00:00
|
|
|
destroy_devl(dev);
|
2004-09-23 07:17:41 +00:00
|
|
|
dev_unlock();
|
1999-08-29 09:09:12 +00:00
|
|
|
}
|
|
|
|
|
1999-09-13 12:29:32 +00:00
|
|
|
const char *
|
2004-06-16 09:47:26 +00:00
|
|
|
devtoname(struct cdev *dev)
|
1999-08-17 20:25:50 +00:00
|
|
|
{
|
1999-08-29 09:09:12 +00:00
|
|
|
char *p;
|
2004-09-24 06:29:23 +00:00
|
|
|
struct cdevsw *csw;
|
1999-09-13 12:29:32 +00:00
|
|
|
int mynor;
|
1999-08-29 09:09:12 +00:00
|
|
|
|
|
|
|
if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') {
|
|
|
|
p = dev->si_name;
|
2004-09-24 06:29:23 +00:00
|
|
|
csw = dev_refthread(dev);
|
|
|
|
if (csw != NULL) {
|
|
|
|
sprintf(p, "(%s)", csw->d_name);
|
|
|
|
dev_relthread(dev);
|
|
|
|
}
|
1999-08-29 09:09:12 +00:00
|
|
|
p += strlen(p);
|
1999-09-13 12:29:32 +00:00
|
|
|
mynor = minor(dev);
|
|
|
|
if (mynor < 0 || mynor > 255)
|
2004-09-24 06:29:23 +00:00
|
|
|
sprintf(p, "/%#x", (u_int)mynor);
|
1999-09-13 12:29:32 +00:00
|
|
|
else
|
2004-09-24 06:29:23 +00:00
|
|
|
sprintf(p, "/%d", mynor);
|
1999-08-29 09:09:12 +00:00
|
|
|
}
|
1999-08-17 20:25:50 +00:00
|
|
|
return (dev->si_name);
|
|
|
|
}
|
2000-09-02 19:17:34 +00:00
|
|
|
|
|
|
|
int
|
2002-03-10 10:50:05 +00:00
|
|
|
dev_stdclone(char *name, char **namep, const char *stem, int *unit)
|
2000-09-02 19:17:34 +00:00
|
|
|
{
|
|
|
|
int u, i;
|
|
|
|
|
|
|
|
i = strlen(stem);
|
2001-04-14 21:33:58 +00:00
|
|
|
if (bcmp(stem, name, i) != 0)
|
|
|
|
return (0);
|
2000-09-02 19:17:34 +00:00
|
|
|
if (!isdigit(name[i]))
|
|
|
|
return (0);
|
|
|
|
u = 0;
|
2001-11-16 17:05:07 +00:00
|
|
|
if (name[i] == '0' && isdigit(name[i+1]))
|
|
|
|
return (0);
|
2000-09-02 19:17:34 +00:00
|
|
|
while (isdigit(name[i])) {
|
|
|
|
u *= 10;
|
|
|
|
u += name[i++] - '0';
|
|
|
|
}
|
2002-10-05 17:10:28 +00:00
|
|
|
if (u > 0xffffff)
|
|
|
|
return (0);
|
2000-09-02 19:17:34 +00:00
|
|
|
*unit = u;
|
|
|
|
if (namep)
|
|
|
|
*namep = &name[i];
|
|
|
|
if (name[i])
|
|
|
|
return (2);
|
|
|
|
return (1);
|
|
|
|
}
|
2000-09-09 11:39:59 +00:00
|
|
|
|
2004-02-21 20:29:52 +00:00
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*
|
2004-06-22 20:22:24 +00:00
|
|
|
* 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
|
2004-02-21 20:29:52 +00:00
|
|
|
* 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;
|
|
|
|
};
|
|
|
|
|
2004-03-11 12:58:55 +00:00
|
|
|
void
|
|
|
|
clone_setup(struct clonedevs **cdp)
|
|
|
|
{
|
|
|
|
|
|
|
|
*cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO);
|
|
|
|
LIST_INIT(&(*cdp)->head);
|
|
|
|
}
|
|
|
|
|
2004-02-21 20:29:52 +00:00
|
|
|
int
|
2004-06-16 09:47:26 +00:00
|
|
|
clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, struct cdev **dp, u_int extra)
|
2004-02-21 20:29:52 +00:00
|
|
|
{
|
|
|
|
struct clonedevs *cd;
|
2005-01-24 12:44:56 +00:00
|
|
|
struct cdev *dev, *ndev, *dl, *de;
|
2004-02-21 20:29:52 +00:00
|
|
|
int unit, low, u;
|
|
|
|
|
2004-03-11 12:58:55 +00:00
|
|
|
KASSERT(*cdp != NULL,
|
|
|
|
("clone_setup() not called in driver \"%s\"", csw->d_name));
|
2004-02-21 20:29:52 +00:00
|
|
|
KASSERT(!(extra & CLONE_UNITMASK),
|
2004-03-11 12:58:55 +00:00
|
|
|
("Illegal extra bits (0x%x) in clone_create", extra));
|
2004-02-21 20:29:52 +00:00
|
|
|
KASSERT(*up <= CLONE_UNITMASK,
|
2004-03-11 12:58:55 +00:00
|
|
|
("Too high unit (0x%x) in clone_create", *up));
|
2004-02-21 20:29:52 +00:00
|
|
|
|
2005-02-27 22:57:32 +00:00
|
|
|
if (!(csw->d_flags & D_INIT))
|
|
|
|
prep_cdevsw(csw);
|
2004-02-21 20:29:52 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* 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;
|
2005-01-24 12:44:56 +00:00
|
|
|
ndev = allocdev();
|
|
|
|
dev_lock();
|
2004-03-11 14:11:02 +00:00
|
|
|
low = extra;
|
2004-02-21 20:29:52 +00:00
|
|
|
de = dl = NULL;
|
2004-03-11 12:58:55 +00:00
|
|
|
cd = *cdp;
|
2004-02-21 20:29:52 +00:00
|
|
|
LIST_FOREACH(dev, &cd->head, si_clone) {
|
2005-01-24 12:44:56 +00:00
|
|
|
KASSERT(dev->si_flags & SI_CLONELIST,
|
|
|
|
("Dev %p(%s) should be on clonelist", dev, dev->si_name));
|
2004-02-21 20:29:52 +00:00
|
|
|
u = dev2unit(dev);
|
|
|
|
if (u == (unit | extra)) {
|
|
|
|
*dp = dev;
|
2005-01-24 12:44:56 +00:00
|
|
|
freedev(ndev);
|
|
|
|
dev_unlock();
|
2004-02-21 20:29:52 +00:00
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
if (unit == -1 && u == low) {
|
|
|
|
low++;
|
|
|
|
de = dev;
|
|
|
|
continue;
|
|
|
|
}
|
2004-03-11 14:11:02 +00:00
|
|
|
if (u > (unit | extra)) {
|
2004-02-21 20:29:52 +00:00
|
|
|
dl = dev;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (unit == -1)
|
2004-03-11 14:11:02 +00:00
|
|
|
unit = low & CLONE_UNITMASK;
|
2005-03-29 09:56:21 +00:00
|
|
|
dev = newdev(csw, unit2minor(unit | extra), ndev);
|
2005-01-24 12:44:56 +00:00
|
|
|
if (dev->si_flags & SI_CLONELIST) {
|
|
|
|
printf("dev %p (%s) is on clonelist\n", dev, dev->si_name);
|
|
|
|
printf("unit=%d\n", unit);
|
|
|
|
LIST_FOREACH(dev, &cd->head, si_clone) {
|
|
|
|
printf("\t%p %s\n", dev, dev->si_name);
|
|
|
|
}
|
|
|
|
panic("foo");
|
|
|
|
}
|
2004-02-21 20:29:52 +00:00
|
|
|
KASSERT(!(dev->si_flags & SI_CLONELIST),
|
2005-01-24 12:44:56 +00:00
|
|
|
("Dev %p(%s) should not be on clonelist", dev, dev->si_name));
|
2004-02-21 20:29:52 +00:00
|
|
|
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;
|
2005-01-24 12:44:56 +00:00
|
|
|
dev_unlock();
|
2004-02-21 20:29:52 +00:00
|
|
|
return (1);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Kill everything still on the list. The driver should already have
|
2004-06-16 09:47:26 +00:00
|
|
|
* disposed of any softc hung of the struct cdev *'s at this time.
|
2004-02-21 20:29:52 +00:00
|
|
|
*/
|
|
|
|
void
|
|
|
|
clone_cleanup(struct clonedevs **cdp)
|
|
|
|
{
|
2004-06-16 09:47:26 +00:00
|
|
|
struct cdev *dev, *tdev;
|
2004-02-21 20:29:52 +00:00
|
|
|
struct clonedevs *cd;
|
|
|
|
|
|
|
|
cd = *cdp;
|
|
|
|
if (cd == NULL)
|
|
|
|
return;
|
2005-01-24 12:44:56 +00:00
|
|
|
dev_lock();
|
2004-02-21 20:29:52 +00:00
|
|
|
LIST_FOREACH_SAFE(dev, &cd->head, si_clone, tdev) {
|
2005-01-24 12:44:56 +00:00
|
|
|
KASSERT(dev->si_flags & SI_CLONELIST,
|
|
|
|
("Dev %p(%s) should be on clonelist", dev, dev->si_name));
|
2004-02-21 20:29:52 +00:00
|
|
|
KASSERT(dev->si_flags & SI_NAMED,
|
2005-03-15 11:33:28 +00:00
|
|
|
("Driver has goofed in cloning underways udev %x", dev->si_drv0));
|
2005-02-22 15:51:07 +00:00
|
|
|
destroy_devl(dev);
|
2004-02-21 20:29:52 +00:00
|
|
|
}
|
2005-01-24 12:44:56 +00:00
|
|
|
dev_unlock();
|
2004-02-21 20:29:52 +00:00
|
|
|
free(cd, M_DEVBUF);
|
|
|
|
*cdp = NULL;
|
|
|
|
}
|