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.Dd June 24, 2012 26.Dt VIRTIO_SCSI 4 27.Os 28.Sh NAME 29.Nm virtio_scsi 30.Nd VirtIO SCSI driver 31.Sh SYNOPSIS 32To compile this driver into the kernel, 33place the following lines in your 34kernel configuration file: 35.Bd -ragged -offset indent 36.Cd "device virtio_scsi" 37.Ed 38.Pp 39Alternatively, to load the driver as a 40module at boot time, place the following line in 41.Xr loader.conf 5 : 42.Bd -literal -offset indent 43virtio_scsi_load="YES" 44.Ed 45.Sh DESCRIPTION 46The 47.Nm 48device driver provides support for VirtIO SCSI devices. 49.Sh LOADER TUNABLES 50Tunables can be set at the 51.Xr loader 8 52prompt before booting the kernel or stored in 53.Xr loader.conf 5 . 54.Bl -tag -width "xxxxxx" 55.It Va hw.vtscsi.bus_reset_disable 56In the initial QEMU release with VirtIO SCSI support, in-flight 57operations were not aborted when stopping the device, rendering 58bus reset ineffective. 59This tunable disables attempts to issue reset bus commands. 60The default value is 1. 61.El 62.Sh DEBUGGING 63To enable debugging prints from the 64.Nm 65driver, set the 66.Bd -literal -offset indent 67hw.vtscsi.X.debug_level 68.Ed 69.Pp 70variable, where X is the adapter number, either in 71.Xr loader.conf 5 72or via 73.Xr sysctl 8 . 74The following bits have the described effects: 75.Bl -tag -width 6n -offset indent 76.It 0x01 77Enable informational prints. 78.It 0x02 79Enable prints for driver errors. 80.It 0x04 81Enable tracing prints. 82.El 83.Sh SEE ALSO 84.Xr virtio 4 85.Sh HISTORY 86The 87.Nm 88driver was written by 89.An Bryan Venteicher Aq Mt bryanv@FreeBSD.org . 90It first appeared in 91.Fx 10.0 . 92