From 2f91a0d03939da4726c65c68b0f68b481e4cae31 Mon Sep 17 00:00:00 2001
From: 514fpv <koishi@514fpv.one>
Date: Tue, 9 Jan 2024 15:02:40 +0800
Subject: [PATCH] feat(gui): add arc toggle specialisation

---
 global/gui/default.nix | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/global/gui/default.nix b/global/gui/default.nix
index 09c1595f..9d44a37d 100644
--- a/global/gui/default.nix
+++ b/global/gui/default.nix
@@ -20,6 +20,11 @@ in {
       type = with types; enum [ "intel" "amdgpu" "nvidia" "prime" ];
       description = "type of graphics acceleration used";
     };
+    arc = mkOption {
+      type = with types; nullOr str;
+      default = null;
+      description = "intel arc PCI ID if installed, enables toggling the arc before boot";
+    };
   };
 
   config = mkIf cfg.enable {
@@ -66,9 +71,21 @@ in {
       };
     };
 
+    specialisation.withArc = mkIf (cfg.arc != null) {
+      configuration = {
+        global.gui.arc = mkForce null;
+      };
+    };
+
     boot.initrd.kernelModules =
     optional amdgpu "amdgpu" ++
-    optional intel "i915";
+    optional intel "i915" ++
+    optional (cfg.arc != null) "vfio-pci";
+
+    boot.extraModprobeConfig = mkIf (cfg.arc != null) ''
+      softdep drm pre: vfio-pci
+      options vfio-pci ids=${cfg.arc}
+    '';
 
     boot.kernelParams = optional intel "i915.fastboot=1";
   };