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+.\" Copyright (c) 2012 Bryan Venteicher
+.\" 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 24, 2012
+.Dt VIRTIO_SCSI 4
+.Os
+.Sh NAME
+.Nm virtio_scsi
+.Nd VirtIO SCSI driver
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following lines in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device virtio_scsi"
+.Ed
+.Pp
+Alternatively, to load the driver as a
+module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+virtio_scsi_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+device driver provides support for VirtIO SCSI devices.
+.Sh LOADER TUNABLES
+Tunables can be set at the
+.Xr loader 8
+prompt before booting the kernel or stored in
+.Xr loader.conf 5 .
+.Bl -tag -width "xxxxxx"
+.It Va hw.vtscsi.bus_reset_disable
+In the initial QEMU release with VirtIO SCSI support, in-flight
+operations were not aborted when stopping the device, rendering
+bus reset ineffective. This tunable disables attempts to issue
+reset bus commands. The default value is 1.
+.El
+.Sh DEBUGGING
+To enable debugging prints from the
+.Nm
+driver, set the
+.Bd -literal -offset indent
+hw.vtscsi.X.debug_level
+.Ed
+.Pp
+variable, where X is the adapter number, either in
+.Xr loader.conf 5
+or via
+.Xr sysctl 8 .
+The following bits have the described effects:
+.Bl -tag -width 6n -offset indent
+.It 0x01
+Enable informational prints.
+.It 0x02
+Enable prints for driver errors.
+.It 0x04
+Enable tracing prints.
+.El
+.Sh SEE ALSO
+.Xr virtio 4
+.Sh HISTORY
+The
+.Nm
+driver was written by
+.An Bryan Venteicher Aq bryanv@FreeBSD.org .
+It first appeared in
+.Fx 10.0 .