93 lines
2.8 KiB
Groff
93 lines
2.8 KiB
Groff
.\" Copyright (c) 2012 Bryan Venteicher
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd June 24, 2012
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.Dt VIRTIO_SCSI 4
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.Os
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.Sh NAME
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.Nm virtio_scsi
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.Nd VirtIO SCSI driver
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device virtio_scsi"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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virtio_scsi_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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device driver provides support for VirtIO SCSI devices.
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.Sh LOADER TUNABLES
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Tunables can be set at the
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.Xr loader 8
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prompt before booting the kernel or stored in
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.Xr loader.conf 5 .
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.Bl -tag -width "xxxxxx"
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.It Va hw.vtscsi.bus_reset_disable
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In the initial QEMU release with VirtIO SCSI support, in-flight
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operations were not aborted when stopping the device, rendering
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bus reset ineffective. This tunable disables attempts to issue
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reset bus commands. The default value is 1.
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.El
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.Sh DEBUGGING
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To enable debugging prints from the
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.Nm
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driver, set the
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.Bd -literal -offset indent
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hw.vtscsi.X.debug_level
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.Ed
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.Pp
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variable, where X is the adapter number, either in
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.Xr loader.conf 5
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or via
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.Xr sysctl 8 .
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The following bits have the described effects:
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.Bl -tag -width 6n -offset indent
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.It 0x01
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Enable informational prints.
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.It 0x02
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Enable prints for driver errors.
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.It 0x04
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Enable tracing prints.
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.El
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.Sh SEE ALSO
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.Xr virtio 4
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.Sh HISTORY
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The
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.Nm
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driver was written by
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.An Bryan Venteicher Aq Mt bryanv@FreeBSD.org .
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It first appeared in
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.Fx 10.0 .
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