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.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: d -ragged -offset indent .Cd "device virtio_scsi" .Ed
p Alternatively, to load the driver as a module at boot time, place the following line in .Xr loader.conf 5 : d -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 . l -tag -width "xxxxxx" t 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 d -literal -offset indent hw.vtscsi.X.debug_level .Ed
p 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: l -tag -width 6n -offset indent t 0x01 Enable informational prints. t 0x02 Enable prints for driver errors. t 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 9.2 .