List the devices and their IOMMU groups.

lsiommu

#!/bin/bash
for d in $(find /sys/kernel/iommu_groups/ -type l | sort -n -k5 -t/); do 
    n=${d#*/iommu_groups/*}; n=${n%%/*}
    printf 'IOMMU Group %s ' "$n"
    lspci -nns "${d##*/}"
done;

For a bit nicer looking output: https://gist.github.com/r15ch13/ba2d738985fce8990a4e9f32d07c6ada 😄