From de8f54ead27aa6e944b8fa916540431d48858b09 Mon Sep 17 00:00:00 2001
From: Myned <dev@bjork.tech>
Date: Fri, 6 Dec 2024 19:43:29 -0600
Subject: [PATCH] iommu.sh: initial script

Signed-off-by: Myned <dev@bjork.tech>
---
 options/custom/scripts/default.nix |  5 +++++
 options/custom/scripts/iommu.sh    | 12 ++++++++++++
 2 files changed, 17 insertions(+)
 create mode 100644 options/custom/scripts/iommu.sh

diff --git a/options/custom/scripts/default.nix b/options/custom/scripts/default.nix
index 719d083..5924c4b 100644
--- a/options/custom/scripts/default.nix
+++ b/options/custom/scripts/default.nix
@@ -94,6 +94,11 @@ in {
               libnotify
               systemd
             ])
+            (bash "iommu" [
+              coreutils
+              findutils
+              pciutils
+            ])
             (bash "launch" [
               argc
               coreutils
diff --git a/options/custom/scripts/iommu.sh b/options/custom/scripts/iommu.sh
new file mode 100644
index 0000000..11cf9a3
--- /dev/null
+++ b/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