Attempt individual kernel module build

hosts/default/amdgpu.nix

@@ -0,0 +1,38 @@
+{ pkgs
+, lib
+, kernel ? pkgs.linuxPackages_latest.kernel
+}:
+
+pkgs.stdenv.mkDerivation {
+  pname = "amdgpu-kernel-module";
+  inherit (kernel) src version postPatch nativeBuildInputs;
+
+  kernel_dev = kernel.dev;
+  kernelVersion = kernel.modDirVersion;
+
+  modulePath = "drivers/gpu/drm/amd/amdgpu";
+
+  buildPhase = ''
+    BUILT_KERNEL=$kernel_dev/lib/modules/$kernelVersion/build
+
+    cp $BUILT_KERNEL/Module.symvers .
+    cp $BUILT_KERNEL/.config        .
+    cp $kernel_dev/vmlinux          .
+
+    make "-j$NIX_BUILD_CORES" modules_prepare
+    make "-j$NIX_BUILD_CORES" M=$modulePath modules
+  '';
+
+  installPhase = ''
+    make \
+      INSTALL_MOD_PATH="$out" \
+      XZ="xz -T$NIX_BUILD_CORES" \
+      M="$modulePath" \
+      modules_install
+  '';
+
+  meta = {
+    description = "AMD GPU kernel module";
+    license = lib.licenses.gpl3;
+  };
+}

hosts/default/configuration.nix

@@ -10,6 +10,13 @@
 
 { config, pkgs, inputs, ... }:
 
+# Direct patching to enable async reprojection (for SteamVR) on AMD
+let
+  amdgpu-kernel-module = pkgs.callPackage ./amdgpu.nix {
+    # Make sure the module targets the same kernel as your system is using.
+    kernel = config.boot.kernelPackages.kernel;
+  };
+in
 {
   imports =
     [ # Include the results of the hardware scan.
@@ -60,9 +67,15 @@
   # kvm-amd - AMD virtualization support
   boot.kernelModules = [ "kvm-amd" "nct6775" ];
 
-  # Problems with hangs on RX6700
+  # Fix problems with hanging on RX6700 (disables PSR - Panel Self Refresh)
   boot.kernelParams = [ "amdgpu.dcdebugmask=0x10" ];
 
+  boot.extraModulePackages = [
+    (amdgpu-kernel-module.overrideAttrs (_: {
+      patches = [ ./patches/cap_sys_nice_begone.patch ];
+    }))
+  ];
+
   # Direct patching for enabling for async reprojection (for SteamVR) on AMD
   # boot.kernelPatches = [
   #  {

hosts/default/patches/cap_sys_nice_begone.patch

@@ -0,0 +1,26 @@
+From fe059b4c373639fc5d69067e62de3f2a0e44a037 Mon Sep 17 00:00:00 2001
+From: Sefa Eyeoglu <contact@scrumplex.net>
+Date: Fri, 17 Mar 2023 16:50:57 +0100
+Subject: [PATCH] amdgpu: allow any ctx priority
+
+Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>
+---
+ drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
+index d2139ac12159..c7f1d36329c8 100644
+--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
++++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
+@@ -107,7 +107,7 @@ static int amdgpu_ctx_priority_permit(struct drm_file *filp,
+ 	if (drm_is_current_master(filp))
+ 		return 0;
+ 
+-	return -EACCES;
++	return 0;
+ }
+ 
+ static enum amdgpu_gfx_pipe_priority amdgpu_ctx_prio_to_gfx_pipe_prio(int32_t prio)
+-- 
+2.39.2
+