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1.. SPDX-License-Identifier: GPL-2.0+2.. note: can be edited and viewed with /usr/bin/formiko-vim3 4==========================================================5PCI VFIO driver for the AMD/Pensando(R) DSC adapter family6==========================================================7 8AMD/Pensando Linux VFIO PCI Device Driver9Copyright(c) 2023 Advanced Micro Devices, Inc.10 11Overview12========13 14The ``pds-vfio-pci`` module is a PCI driver that supports Live Migration15capable Virtual Function (VF) devices in the DSC hardware.16 17Using the device18================19 20The pds-vfio-pci device is enabled via multiple configuration steps and21depends on the ``pds_core`` driver to create and enable SR-IOV Virtual22Function devices.23 24Shown below are the steps to bind the driver to a VF and also to the25associated auxiliary device created by the ``pds_core`` driver. This26example assumes the pds_core and pds-vfio-pci modules are already27loaded.28 29.. code-block:: bash30 :name: example-setup-script31 32 #!/bin/bash33 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 device39 echo 0 > /sys/class/pci_bus/$PF_BUS/device/$PF_BDF/sriov_drivers_autoprobe40 41 # Create single VF for Live Migration via pds_core42 echo 1 > /sys/bus/pci/drivers/pds_core/$PF_BDF/sriov_numvfs43 44 # Allow the VF to be bound to the pds-vfio-pci driver45 echo "pds-vfio-pci" > /sys/class/pci_bus/$PF_BUS/device/$VF_BDF/driver_override46 47 # Bind the VF to the pds-vfio-pci driver48 echo "$VF_BDF" > /sys/bus/pci/drivers/pds-vfio-pci/bind49 50After performing the steps above, a file in /dev/vfio/<iommu_group>51should have been created.52 53 54Enabling the driver55===================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 Drivers65 -> VFIO Non-Privileged userspace driver framework66 -> VFIO support for PDS PCI devices67 68Support69=======70 71For general Linux networking support, please use the netdev mailing72list, which is monitored by Pensando personnel::73 74 netdev@vger.kernel.org75 76For more specific support needs, please use the Pensando driver support77email::78 79 drivers@pensando.io80