#!/bin/bash
# limetech - wrapper for Andre Ritchter's vfio-bind script:
# https://github.com/andre-richter/vfio-pci-bind/blob/master/vfio-pci-bind.sh
# additional changes by ljm42
#
# Invoked early in startup before any devices are bound.
# Devices are specified in /boot/config/vfio-pci.cfg:
# BIND=<Vendor:Device>|<Domain:Bus:Device.Function> <Vendor:Device>|<Domain:Bus:Device.Function>
#
# Order does not matter. If both are provided, must be separated by "|".
# Multiple entries must be separated by space.
#

# Invoke script for each device referenced via /boot/config/vfio-pci.cfg
# Accept string enclosed in quotes or not
CFG=/boot/config/vfio-pci.cfg

[[ ! -f "$CFG" ]] && exit
grep -q "^BIND=" "$CFG" || exit
echo "Loading config from $CFG"
cat $CFG
echo "---"

if [[ ! "$(ls -A /sys/kernel/iommu_groups/)" ]]; then
    echo "Error: IOMMU not available"
    exit 1
fi

while IFS='=' read -r name value
do
    [[ ! -z "$value" ]] && declare "${name}"="${value//\"}"
done <<< $(/usr/bin/fromdos < $CFG)
[[ -z "$BIND" ]] && exit

for PARAM in $BIND
do
    while IFS='|' read -r arg1 arg2
    do
        echo "Processing $arg1 $arg2"
        /usr/local/sbin/vfio-pci-bind.sh $arg1 $arg2
        echo "---"
    done <<< $PARAM
done

echo 'Devices listed in /sys/bus/pci/drivers/vfio-pci:'
ls -l /sys/bus/pci/drivers/vfio-pci | egrep [[:xdigit:]]{4}:

echo "vfio-pci binding complete"