From 9ced079f552d2e2284954d94131a1cc8bd528ff0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=A9ana=20=E6=B1=9F?= <leana.jiang+git@icloud.com>
Date: Thu, 11 Sep 2025 08:03:50 +0800
Subject: [PATCH] vanadium: kernel customization

---
 nix/configurations/vanadium.nix               |  1 +
 .../vanadium/kernel-overlay.nix               | 57 +++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 nix/configurations/vanadium/kernel-overlay.nix

diff --git a/nix/configurations/vanadium.nix b/nix/configurations/vanadium.nix
index 864c0802..4a3075a3 100644
--- a/nix/configurations/vanadium.nix
+++ b/nix/configurations/vanadium.nix
@@ -58,6 +58,7 @@ in
             ../packages/overlay.nix
 
             ./vanadium/overlay.nix
+            ./vanadium/kernel-overlay.nix
 
             # removed, but I need it for PLFA!
             ../overlays/pin-emacs28.nix
diff --git a/nix/configurations/vanadium/kernel-overlay.nix b/nix/configurations/vanadium/kernel-overlay.nix
new file mode 100644
index 00000000..7702acad
--- /dev/null
+++ b/nix/configurations/vanadium/kernel-overlay.nix
@@ -0,0 +1,57 @@
+final: prev: let
+  inherit (final) lib;
+in {
+  linuxPackages = final.linuxPackagesFor (
+    prev.linuxPackages.kernel.override {
+      ignoreConfigErrors = true;
+      structuredExtraConfig = with lib.kernel; {
+        # optimisation for ryzen 7
+        # https://wiki.gentoo.org/wiki/Ryzen
+        SMP = yes;
+        X86_X2APIC = yes;
+        X86_AMD_PLATFORM_DEVICE = yes;
+        PROCESSOR_SELECT = yes;
+        CPU_SUP_AMD = yes;
+        SCHED_MC = yes;
+        X86_MCE = yes;
+        X86_MCE_AMD = yes;
+        PERF_EVENTS_INTEL_RAPL = yes;
+        # # unused option
+        # CPU_FREQ_DEFAULT_GOV_ONDEMAND = yes;
+        # # no such option
+        # MICROCODE_AMD = yes;
+        # # <5.17
+        # X86_ACPI_CPUFREQ = yes;
+        X86_AMD_PSTATE = yes;
+        X86_POWERNOW_K8 = no;
+        # # FIXME: crashes the build, seems to answer the question twice
+        # X86_AMD_FREQ_SENSITIVITY = yes;
+        # skipping firmware loading since it's handled by other parts of nix
+        SENSORS_K10TEMP = yes;
+        IOMMU_SUPPORT = yes;
+        AMD_IOMMU = yes;
+        # # no such option
+        # AMD_IOMMU_2 = yes;
+
+        # additional chipset drivers
+        I2C_PIIX4 = yes;
+        PINCTRL = yes;
+        PINCTRL_AMD = yes;
+        CRYPTO = yes;
+        CRYPTO_HW = yes;
+        CRYPTO_DEV_CCP = yes;
+        CRYPTO_DEV_SP_CCP = yes;
+        CRYPTO_DEV_CCP_CRYPTO = yes;
+        CRYPTO_DEV_CCP_DD = yes;
+        CRYPTO_DEV_SP_PSP = yes;
+
+        # Power management controller
+        X86_PLATFORM_DEVICES = yes;
+        AMD_PMC = yes;
+
+        # My config
+        DRM_AMDGPU = yes; # Recent AMD GPU
+      };
+    }
+  );
+}