1.\" Copyright (c) 2012 Bryan Venteicher 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd June 24, 2012 28.Dt VIRTIO_SCSI 4 29.Os 30.Sh NAME 31.Nm virtio_scsi 32.Nd VirtIO SCSI driver 33.Sh SYNOPSIS 34To compile this driver into the kernel, 35place the following lines in your 36kernel configuration file: 37.Bd -ragged -offset indent 38.Cd "device virtio_scsi" 39.Ed 40.Pp 41Alternatively, to load the driver as a 42module at boot time, place the following line in 43.Xr loader.conf 5 : 44.Bd -literal -offset indent 45virtio_scsi_load="YES" 46.Ed 47.Sh DESCRIPTION 48The 49.Nm 50device driver provides support for VirtIO SCSI devices. 51.Sh LOADER TUNABLES 52Tunables can be set at the 53.Xr loader 8 54prompt before booting the kernel or stored in 55.Xr loader.conf 5 . 56.Bl -tag -width "xxxxxx" 57.It Va hw.vtscsi.bus_reset_disable 58In the initial QEMU release with VirtIO SCSI support, in-flight 59operations were not aborted when stopping the device, rendering 60bus reset ineffective. 61This tunable disables attempts to issue reset bus commands. 62The default value is 1. 63.El 64.Sh DEBUGGING 65To enable debugging prints from the 66.Nm 67driver, set the 68.Bd -literal -offset indent 69hw.vtscsi.X.debug_level 70.Ed 71.Pp 72variable, where X is the adapter number, either in 73.Xr loader.conf 5 74or via 75.Xr sysctl 8 . 76The following bits have the described effects: 77.Bl -tag -width 6n -offset indent 78.It 0x01 79Enable informational prints. 80.It 0x02 81Enable prints for driver errors. 82.It 0x04 83Enable tracing prints. 84.El 85.Sh SEE ALSO 86.Xr virtio 4 87.Sh HISTORY 88The 89.Nm 90driver was written by 91.An Bryan Venteicher Aq Mt bryanv@FreeBSD.org . 92It first appeared in 93.Fx 10.0 . 94