1.. SPDX-License-Identifier: GPL-2.0+ 2.. note: can be edited and viewed with /usr/bin/formiko-vim 3 4========================================================== 5PCI VFIO driver for the AMD/Pensando(R) DSC adapter family 6========================================================== 7 8AMD/Pensando Linux VFIO PCI Device Driver 9Copyright(c) 2023 Advanced Micro Devices, Inc. 10 11Overview 12======== 13 14The ``pds-vfio-pci`` module is a PCI driver that supports Live Migration 15capable Virtual Function (VF) devices in the DSC hardware. 16 17Using the device 18================ 19 20The pds-vfio-pci device is enabled via multiple configuration steps and 21depends on the ``pds_core`` driver to create and enable SR-IOV Virtual 22Function devices. 23 24Shown below are the steps to bind the driver to a VF and also to the 25associated auxiliary device created by the ``pds_core`` driver. This 26example assumes the pds_core and pds-vfio-pci modules are already 27loaded. 28 29.. code-block:: bash 30 :name: example-setup-script 31 32 #!/bin/bash 33 34 PF_BUS="0000:60" 35 PF_BDF="0000:60:00.0" 36 VF_BDF="0000:60:00.1" 37 38 # Prevent non-vfio VF driver from probing the VF device 39 echo 0 > /sys/class/pci_bus/$PF_BUS/device/$PF_BDF/sriov_drivers_autoprobe 40 41 # Create single VF for Live Migration via pds_core 42 echo 1 > /sys/bus/pci/drivers/pds_core/$PF_BDF/sriov_numvfs 43 44 # Allow the VF to be bound to the pds-vfio-pci driver 45 echo "pds-vfio-pci" > /sys/class/pci_bus/$PF_BUS/device/$VF_BDF/driver_override 46 47 # Bind the VF to the pds-vfio-pci driver 48 echo "$VF_BDF" > /sys/bus/pci/drivers/pds-vfio-pci/bind 49 50After performing the steps above, a file in /dev/vfio/<iommu_group> 51should have been created. 52 53 54Enabling the driver 55=================== 56 57The driver is enabled via the standard kernel configuration system, 58using the make command:: 59 60 make oldconfig/menuconfig/etc. 61 62The driver is located in the menu structure at: 63 64 -> Device Drivers 65 -> VFIO Non-Privileged userspace driver framework 66 -> VFIO support for PDS PCI devices 67 68Support 69======= 70 71For general Linux networking support, please use the netdev mailing 72list, which is monitored by Pensando personnel:: 73 74 netdev@vger.kernel.org 75 76For more specific support needs, please use the Pensando driver support 77email:: 78 79 drivers@pensando.io 80