tty: Add support for disabling DRM devices

docs/wiki/Configuration:-Debug-Options.md

@@ -18,6 +18,8 @@ debug {
     disable-direct-scanout
     restrict-primary-scanout-to-matching-format
     render-drm-device "/dev/dri/renderD129"
+    ignore-drm-device "/dev/dri/renderD128"
+    ignore-drm-device "/dev/dri/renderD130"
     force-pipewire-invalid-modifier
     dbus-interfaces-in-non-session-instances
     wait-for-frame-completion-before-queueing
@@ -115,6 +117,20 @@ debug {
 }
 ```
 
+### `ignore-drm-device`
+
+<sup>Since: next release</sup>
+
+List DRM devices that niri will ignore.
+Useful for GPU passthrough when you don't want niri to open a certain device.
+
+```kdl
+debug {
+    ignore-drm-device "/dev/dri/renderD128"
+    ignore-drm-device "/dev/dri/renderD130"
+}
+```
+
 ### `force-pipewire-invalid-modifier`
 
 <sup>Since: 25.01</sup>