iommu.sh: initial script

Signed-off-by: Myned <dev@bjork.tech>

options/custom/scripts/default.nix

@@ -94,6 +94,11 @@ in {
               libnotify
               systemd
             ])
+            (bash "iommu" [
+              coreutils
+              findutils
+              pciutils
+            ])
             (bash "launch" [
               argc
               coreutils

options/custom/scripts/iommu.sh

@@ -0,0 +1,12 @@
+#! /usr/bin/env bash
+
+# https://wiki.archlinux.org/title/PCI_passthrough_via_OVMF#Ensuring_that_the_groups_are_valid
+
+shopt -s nullglob
+
+for g in $(find /sys/kernel/iommu_groups/* -maxdepth 0 -type d | sort -V); do
+    echo "IOMMU Group ${g##*/}:"
+    for d in "$g"/devices/*; do
+        echo -e "\t$(lspci -nns "${d##*/}")"
+  done
+done