usb-pci-iommu.sh

#!/bin/bash
for ctrl in /sys/bus/pci/devices/*/; do
  class=$(cat "$ctrl/class" 2>/dev/null)
  case "$class" in 0x0c03*)
    bdf=$(basename "$ctrl")
    iommu=$(basename $(readlink "$ctrl/iommu_group" 2>/dev/null) 2>/dev/null || echo "none")
    driver=$(basename $(readlink "$ctrl/driver" 2>/dev/null) 2>/dev/null || echo "none")
    desc=$(lspci -s "$bdf" 2>/dev/null | sed 's/^[^ ]* //')
    echo "[$bdf] $desc"
    echo "  IOMMU group: $iommu | driver: $driver"
    for usbbus in "$ctrl"usb*/; do
      [ -d "$usbbus" ] || continue
      busnum=$(cat "$usbbus/busnum" 2>/dev/null)
      [ -n "$busnum" ] || continue
      echo "  USB bus $busnum:"
      lsusb -s "${busnum}:" 2>/dev/null | sed 's/^/    /'
    done
    echo
  esac
done