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.. SPDX-License-Identifier: GPL-2.0+
.. note: can be edited and viewed with /usr/bin/formiko-vim
==========================================================
PCI VFIO driver for the AMD/Pensando(R) DSC adapter family
==========================================================
AMD/Pensando Linux VFIO PCI Device Driver
Copyright(c) 2023 Advanced Micro Devices, Inc.
Overview
========
The ``pds-vfio-pci`` module is a PCI driver that supports Live Migration
capable Virtual Function (VF) devices in the DSC hardware.
Using the device
================
The pds-vfio-pci device is enabled via multiple configuration steps and
depends on the ``pds_core`` driver to create and enable SR-IOV Virtual
Function devices.
Shown below are the steps to bind the driver to a VF and also to the
associated auxiliary device created by the ``pds_core`` driver. This
example assumes the pds_core and pds-vfio-pci modules are already
loaded.
.. code-block:: bash
:name: example-setup-script
#!/bin/bash
PF_BUS="0000:60"
PF_BDF="0000:60:00.0"
VF_BDF="0000:60:00.1"
# Prevent non-vfio VF driver from probing the VF device
echo 0 > /sys/class/pci_bus/$PF_BUS/device/$PF_BDF/sriov_drivers_autoprobe
# Create single VF for Live Migration via pds_core
echo 1 > /sys/bus/pci/drivers/pds_core/$PF_BDF/sriov_numvfs
# Allow the VF to be bound to the pds-vfio-pci driver
echo "pds-vfio-pci" > /sys/class/pci_bus/$PF_BUS/device/$VF_BDF/driver_override
# Bind the VF to the pds-vfio-pci driver
echo "$VF_BDF" > /sys/bus/pci/drivers/pds-vfio-pci/bind
After performing the steps above, a file in /dev/vfio/<iommu_group>
should have been created.
Enabling the driver
===================
The driver is enabled via the standard kernel configuration system,
using the make command::
make oldconfig/menuconfig/etc.
The driver is located in the menu structure at:
-> Device Drivers
-> VFIO Non-Privileged userspace driver framework
-> VFIO support for PDS PCI devices
Support
=======
For general Linux networking support, please use the netdev mailing
list, which is monitored by Pensando personnel::
netdev@vger.kernel.org
For more specific support needs, please use the Pensando driver support
email::
drivers@pensando.io
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