104 lines
3.3 KiB
Groff
104 lines
3.3 KiB
Groff
.\"
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.\" Copyright (c) 1998 Kenneth D. Merry.
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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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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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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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.\" $FreeBSD$
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.\"
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.Dd October 10, 1998
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.Dt XPT 4
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.Os FreeBSD
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.Sh NAME
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.Nm xpt
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.Nd CAM transport layer interface
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.Sh SYNOPSIS
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None.
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.Sh DESCRIPTION
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The
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.Nm
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driver provides a way for userland applications to issue certain CAM CCBs
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to the kernel.
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.Pp
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Since the
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.Nm
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driver allows direct access to the CAM subsystem, system administrators
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should exercise caution when granting access to this driver. If used
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improperly, this driver can allow userland applications to crash a machine
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or cause data loss.
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.Sh KERNEL CONFIGURATION
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There is no kernel configuration required for the
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.Nm
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driver. It is enabled when
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.Tn SCSI
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support is enabled in the kernel. There is one instance of the xpt driver
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per CAM transport layer instance. Since there is currently only one CAM
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transport layer, there will only be one instance of this driver.
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.Sh IOCTLS
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.Bl -tag -width 01234567890123
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.It CAMIOCOMMAND
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This ioctl takes certain kinds of CAM CCBs and passes them through to the
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CAM transport layer for action. Only the following CCB types are
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supported:
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.Pp
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.Bl -tag -width XPT_DEV_MATCH -compact
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.It XPT_SCAN_BUS
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.It XPT_RESET_BUS
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.It XPT_SCAN_LUN
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.It XPT_ENG_INQ
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.It XPT_ENG_EXEC
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.It XPT_DEBUG
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.It XPT_DEV_MATCH
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.It XPT_PATH_INQ
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.El
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.Pp
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The above CCBs are the only ones supported since it makes more sense to
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send them through a generic passthrough device rather than a passthrough
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device tied to a particular underlying
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.Tn SCSI
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device.
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.It CAMGETPASSTHRU
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This ioctl takes an XPT_GDEVLIST CCB, and returns the passthrough device
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corresponding to the device in question.
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.El
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.Sh FILES
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.Bl -tag -width /dev/xpt0 -compact
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.It Pa /dev/xpt0
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Character device node for the
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.Nm
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driver.
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.El
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.Sh DIAGNOSTICS
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None.
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.Sh SEE ALSO
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.Xr cam 3 ,
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.Xr cam_cdbparse 3 ,
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.Xr pass 4 ,
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.Xr camcontrol 8
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.Sh HISTORY
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The CAM transport layer driver first appeared in
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.Fx 3.0 .
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.Sh AUTHORS
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.An Kenneth Merry Aq ken@FreeBSD.org
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