Modularize and configure hardware

hosts/default/configuration.nix

@@ -8,15 +8,11 @@
   imports =
     [ # Hardware-related
       ./hardware-configuration.nix
-      ../../modules/nixos/hardware/swap.nix
-      ../../modules/nixos/hardware/nvidia.nix
+      ../../modules/nixos/alienware/alienware.nix
 
       # Gnome customization
       ../../modules/nixos/gnome.nix
 
-      # Nh helper
-      ../../modules/nixos/nh.nix
-
       # Home-manager
       inputs.home-manager.nixosModules.default
 
@@ -24,9 +20,6 @@
       #../../modules/nixos/stylix/ghibli.nix
       ../../modules/nixos/stylix/kuromi.nix
       #../../modules/nixos/stylix/dracula.nix
-
-      # Gaming
-      ../../modules/nixos/gaming.nix
     ];
 
   # Bootloader.

modules/nixos/alienware/alienware.nix

@@ -0,0 +1,28 @@
+{ lib, ... }:
+
+{
+    imports = [
+        ./hardware/cpu/tiger-lake.nix
+        ./hardware/gpu/nvidia.nix
+        ./gaming.nix
+        ./nh.nix
+    ];
+
+    swapDevices = [{
+        device = "/var/lib/swapfile";
+        size = 20*1024;
+    }];
+
+    hardware = {
+        enableRedistributableFirmware = lib.mkDefault true;
+    };
+
+    services = {
+        fwupd = {
+            enable = lib.mkDefault true;
+        };
+        thermald = {
+            enable = lib.mkDefault true;
+        };
+    };
+}

modules/nixos/alienware/hardware/cpu/intel.nix

@@ -0,0 +1,4 @@
+{ config, lib, ... }:
+{
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}

modules/nixos/alienware/hardware/cpu/tiger-lake.nix

@@ -0,0 +1,15 @@
+{ config, lib, ... }:
+{
+  imports = [
+    ./intel.nix
+    ../gpu/intel.nix
+   ];
+  config = lib.mkMerge [
+    (lib.mkIf (lib.versionAtLeast config.boot.kernelPackages.kernel.version "6.8") {
+      hardware.intelgpu.driver = "xe";
+    })
+    (lib.mkIf (config.hardware.intelgpu.driver == "i915") {
+      boot.kernelParams = [ "i915.enable_guc=3" ];
+    })
+  ];
+}

modules/nixos/alienware/hardware/gpu/intel.nix

@@ -0,0 +1,62 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+{
+  options.hardware.intelgpu.driver = lib.mkOption {
+    description = "Intel GPU driver to use";
+    type = lib.types.enum [
+      "i915"
+      "xe"
+    ];
+    default = "i915";
+  };
+
+  options.hardware.intelgpu.loadInInitrd =
+    lib.mkEnableOption (
+      lib.mdDoc "Load the Intel GPU kernel module at stage 1 boot. (Added to `boot.initrd.kernelModules`)"
+    )
+    // {
+      default = true;
+    };
+
+  config = {
+    boot.initrd.kernelModules = [ config.hardware.intelgpu.driver ];
+
+    environment.variables = {
+      VDPAU_DRIVER = lib.mkIf config.hardware.graphics.enable (lib.mkDefault "va_gl");
+    };
+
+    hardware.graphics.extraPackages = with pkgs; [
+      (
+        if (lib.versionOlder (lib.versions.majorMinor lib.version) "23.11") then
+          vaapiIntel
+        else
+          intel-vaapi-driver
+      )
+      intel-media-driver
+    ];
+
+    hardware.graphics.extraPackages32 = with pkgs.driversi686Linux; [
+      (
+        if (lib.versionOlder (lib.versions.majorMinor lib.version) "23.11") then
+          vaapiIntel
+        else
+          intel-vaapi-driver
+      )
+      intel-media-driver
+    ];
+
+    assertions = [
+      {
+        assertion = (
+          config.hardware.intelgpu.driver != "xe"
+          || lib.versionAtLeast config.boot.kernelPackages.kernel.version "6.8"
+        );
+        message = "Intel Xe GPU driver is not supported on kernels earlier than 6.8. Update or use the i915 driver.";
+      }
+    ];
+  };
+}

modules/nixos/hardware/swap.nix

@@ -1,8 +0,0 @@
-{ pkgs, ... }:
-
-{
-    swapDevices = [{
-        device = "/var/lib/swapfile";
-        size = 20*1024;
-    }];
-}