Refactor the whole configuration

Reviewed-on: #1

modules/nixos/hardware/audio/default.nix

@@ -0,0 +1,54 @@
+{ ... }:
+
+{
+  boot.kernelParams = [ "preempt=full" ];
+  security.rtkit.enable = true;
+  services.pipewire = {
+    enable = true;
+    alsa = {
+      enable = true;
+      support32Bit = true;
+    };
+    pulse.enable = true;
+    jack.enable = true;
+
+    # Reduce latency
+    # https://wiki.nixos.org/wiki/PipeWire#Low-latency_setup
+    extraConfig = let
+      rate = builtins.toString 48000;
+
+      # The default value in the wiki is 32 but might result in crackling audio.
+      # If you get audio crackling try increasing this value until it's gone.
+      quantum = builtins.toString 128;
+    in {
+      pipewire."92-low-latency" = {
+        "context.properties" = {
+          "default.clock.rate" = "${rate}";
+          "default.clock.quantum" = "${quantum}";
+          "default.clock.min-quantum" = "${quantum}";
+          "default.clock.max-quantum" = "${quantum}";
+        };
+      };
+
+      pipewire-pulse."92-low-latency" = {
+        "context.properties" = [
+          {
+            name = "libpipewire-module-protocol-pulse";
+            args = { };
+          }
+        ];
+        "pulse.properties" = {
+          "pulse.min.req" = "${quantum}/${rate}";
+          "pulse.default.req" = "${quantum}/${rate}";
+          "pulse.max.req" = "${quantum}/${rate}";
+          "pulse.min.quantum" = "${quantum}/${rate}";
+          "pulse.max.quantum" = "${quantum}/${rate}";
+        };
+        "stream.properties" = {
+          "node.latency" = "${quantum}/${rate}";
+          "resample.quality" = 1;
+        };
+      };
+    };
+  };
+}

modules/nixos/hardware/cpu/amd/default.nix

@@ -0,0 +1,11 @@
+{ pkgs, ... }:
+
+{
+  boot = {
+    kernelModules = [ "kvm-amd" ];
+    extraModprobeConfig = "options kvm_amd nested=1";
+  };
+
+  hardware.cpu.amd.updateMicrocode = true;
+  hardware.firmware = with pkgs; [ linux-firmware ];
+}

modules/nixos/hardware/gpu/graphics.nix

@@ -0,0 +1,9 @@
+{ ... }:
+{
+  hardware = {
+    graphics = {
+      enable = true;
+      enable32Bit = true;
+    };
+  };
+}

modules/nixos/hardware/gpu/nvidia/default.nix

@@ -0,0 +1,44 @@
+{ config, ... }:
+
+{
+  imports = [
+    ../graphics.nix
+  ];
+
+  hardware = {
+    nvidia = {
+      open = true;
+      modesetting.enable = true;
+      package = config.boot.kernelPackages.nvidiaPackages.beta;
+      nvidiaSettings = false;
+    };
+  };
+
+  boot.kernelParams = [
+    "nvidia_drm.fbdev=1"
+    "nvidia.NVreg_PreserveVideoMemoryAllocations=1"
+  ];
+
+  services.xserver.videoDrivers = [ "nvidia" ];
+
+  environment.sessionVariables = {
+    LIBVA_DRIVER_NAME = "nvidia";
+    GBM_BACKEND = "nvidia-drm";
+    __GLX_VENDOR_LIBRARY_NAME = "nvidia";
+    NVD_BACKEND = "direct";
+    NIXOS_OZONE_WL = 1;
+  };
+
+  nixpkgs.config.cudaSupport = true;
+  nix = {
+    settings = {
+      substituters = [
+        "https://nix-community.cachix.org"
+      ];
+      trusted-public-keys = [
+        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+      ];
+    };
+  };
+}
+