List IOMMU Groups and the connected USB Devices

iommu.sh

#!/usr/bin/env bash

shopt -s nullglob
lastgroup=""
for g in `find /sys/kernel/iommu_groups/* -maxdepth 0 -type d | sort -V`; do
    for d in $g/devices/*; do
        if [ "${g##*/}" != "$lastgroup" ]; then
            echo -en "Group ${g##*/}:\t"
        else
            echo -en "\t\t"
        fi
        lastgroup=${g##*/}
        lspci -nms ${d##*/} | awk -F'"' '{printf "[%s:%s]", $4, $6}'
        if [[ -e "$d"/reset ]]; then echo -en " [R] "; else echo -en "     "; fi

        lspci -mms ${d##*/} | awk -F'"' '{printf "%s %-40s %s\n", $1, $2, $6}'
        for u in ${d}/usb*/; do
            bus=$(cat "${u}/busnum")
            lsusb -s $bus: | \
                awk '{gsub(/:/,"",$4); printf "%s|%s %s %s %s|", $6, $1, $2, $3, $4; for(i=7;i<=NF;i++){printf "%s ", $i}; printf "\n"}' | \
                awk -F'|' '{printf "USB:\t\t[%s]\t\t %-40s %s\n", $1, $2, $3}'
        done
    done
done

Open source router N5105 output:

root@pve ~# ./iommu.sh
Group 0: [8086:4e61] [R] 00:02.0 VGA compatible controller JasperLake [UHD Graphics]
Group 1: [8086:4e24] 00:00.0 Host bridge Device 4e24
Group 2: [8086:4e03] 00:04.0 Signal processing controller Dynamic Tuning service
Group 3: [8086:4ded] 00:14.0 USB controller Device 4ded
USB: [046d:c52b] Bus 001 Device 002 Logitech, Inc. Unifying Receiver
USB: [1d6b:0002] Bus 001 Device 001 Linux Foundation 2.0 root hub
USB: [1d6b:0003] Bus 002 Device 001 Linux Foundation 3.0 root hub
[8086:4def] 00:14.2 RAM memory Device 4def
Group 4: [8086:4de0] 00:16.0 Communication controller Management Engine Interface
Group 5: [8086:4dd3] 00:17.0 SATA controller Device 4dd3
Group 6: [8086:4db8] [R] 00:1c.0 PCI bridge Device 4db8
Group 7: [8086:4dbc] [R] 00:1c.4 PCI bridge Device 4dbc
Group 8: [8086:4dbd] [R] 00:1c.5 PCI bridge Device 4dbd
Group 9: [8086:4dbe] [R] 00:1c.6 PCI bridge Device 4dbe
Group 10: [8086:4dbf] [R] 00:1c.7 PCI bridge Device 4dbf
Group 11: [8086:4d87] 00:1f.0 ISA bridge Device 4d87
[8086:4dc8] 00:1f.3 Audio device Jasper Lake HD Audio
[8086:4da3] 00:1f.4 SMBus Jasper Lake SMBus
[8086:4da4] 00:1f.5 Serial bus controller Jasper Lake SPI Controller
Group 12: [1cc1:8201] [R] 01:00.0 Non-Volatile memory controller XPG SX8200 Pro PCIe Gen3x4 M.2 2280 Solid State Drive
Group 13: [8086:125c] [R] 02:00.0 Ethernet controller Ethernet Controller I226-V
Group 14: [8086:125c] [R] 03:00.0 Ethernet controller Ethernet Controller I226-V
Group 15: [8086:125c] [R] 04:00.0 Ethernet controller Ethernet Controller I226-V
Group 16: [8086:125c] [R] 05:00.0 Ethernet controller Ethernet Controller I226-V

Thank you!