Fabian
198 lines
7.8 KiB
Bash
198 lines
7.8 KiB
Bash
#!/bin/bash
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# =============================================================================
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# Step 4: Download CachyOS Kernel Source, Patch & Build amdgpu Module
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# =============================================================================
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# CRITICAL: Must use CachyOS kernel source (NOT vanilla kernel.org source).
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# Vanilla source has different struct layouts → NULL pointer crash.
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#
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# This script:
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# 1. Detects current kernel version
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# 2. Downloads matching CachyOS source PKGBUILD
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# 3. Extracts and prepares the source tree
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# 4. Applies 3 BC-250 patches (GFXOFF, KIQ bypass, dead-GPU detection)
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# 5. Builds ONLY the amdgpu.ko module (not the entire kernel)
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# 6. Strips debug symbols and compresses with zstd
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#
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# Run as: bash 04_build_patched_module.sh [build_dir]
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# Default build_dir: ~/kernel-build
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#
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# Prerequisites:
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# - CachyOS with ROCm packages installed
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# - base-devel, asp/pkgctl, clang, llvm, lld installed
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# =============================================================================
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set -euo pipefail
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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GUIDE_DIR="$(dirname "$SCRIPT_DIR")"
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PATCHES_DIR="$GUIDE_DIR/patches"
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BUILD_DIR="${1:-$HOME/kernel-build}"
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KERNEL_VER="$(uname -r)"
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echo "============================================"
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echo " Building Patched amdgpu Module for BC-250"
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echo "============================================"
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echo ""
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echo " Kernel: $KERNEL_VER"
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echo " Build dir: $BUILD_DIR"
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echo " Patches: $PATCHES_DIR"
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echo ""
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# ─────────────────────────────────────────────
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# 1. Install Build Dependencies
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# ─────────────────────────────────────────────
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echo "[1/7] Installing build dependencies..."
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sudo pacman -S --needed --noconfirm base-devel asp clang llvm lld bc cpio
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# ─────────────────────────────────────────────
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# 2. Create Build Directory
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# ─────────────────────────────────────────────
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echo "[2/7] Creating build directory..."
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mkdir -p "$BUILD_DIR"
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cd "$BUILD_DIR"
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# ─────────────────────────────────────────────
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# 3. Get CachyOS Kernel Source
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# ─────────────────────────────────────────────
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echo "[3/7] Getting CachyOS kernel source..."
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# Extract base version from running kernel (e.g., 6.19.6-2-cachyos → 6.19.6)
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BASE_VER=$(echo "$KERNEL_VER" | sed 's/-.*//')
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echo " Base kernel version: $BASE_VER"
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# Try to get the PKGBUILD via asp (Arch Source Package)
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if command -v pkgctl &>/dev/null; then
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echo " Using pkgctl to fetch source..."
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pkgctl repo clone --protocol=https linux-cachyos 2>/dev/null || true
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elif command -v asp &>/dev/null; then
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echo " Using asp to fetch source..."
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asp checkout linux-cachyos 2>/dev/null || true
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fi
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# If asp/pkgctl didn't work, try direct download
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if [[ ! -d linux-cachyos ]]; then
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echo " Trying CachyOS GitHub..."
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if command -v git &>/dev/null; then
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git clone --depth 1 https://github.com/CachyOS/linux-cachyos.git 2>/dev/null || true
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fi
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fi
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if [[ ! -d linux-cachyos ]]; then
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echo ""
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echo " ERROR: Could not fetch CachyOS kernel source automatically."
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echo " Please manually download the CachyOS kernel source matching $KERNEL_VER"
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echo " and place it in $BUILD_DIR/linux-cachyos/"
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echo ""
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echo " Options:"
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echo " 1. pkgctl repo clone --protocol=https linux-cachyos"
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echo " 2. git clone https://github.com/CachyOS/linux-cachyos.git"
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echo " 3. Download from https://github.com/CachyOS/linux-cachyos/releases"
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exit 1
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fi
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cd linux-cachyos
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# Run makepkg to download and extract source (don't build yet)
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echo " Extracting source (makepkg --nobuild)..."
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makepkg --nobuild --skippgpcheck 2>&1 | tail -5
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# Find the extracted source directory
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SRC_DIR=$(find . -maxdepth 2 -name "drivers" -type d | head -1 | sed 's|/drivers$||')
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if [[ -z "$SRC_DIR" ]]; then
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SRC_DIR=$(find "$BUILD_DIR" -maxdepth 3 -name "Kconfig" -path "*/linux-*" | head -1 | xargs dirname 2>/dev/null || true)
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fi
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if [[ -z "$SRC_DIR" || ! -d "$SRC_DIR" ]]; then
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echo " ERROR: Could not find extracted kernel source."
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echo " Look for a linux-* directory under $BUILD_DIR/linux-cachyos/src/"
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exit 1
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fi
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echo " Source dir: $SRC_DIR"
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AMDGPU_DIR="$SRC_DIR/drivers/gpu/drm/amd/amdgpu"
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if [[ ! -d "$AMDGPU_DIR" ]]; then
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echo " ERROR: amdgpu source not found at $AMDGPU_DIR"
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exit 1
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fi
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# ─────────────────────────────────────────────
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# 4. Prepare Build Environment
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# ─────────────────────────────────────────────
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echo "[4/7] Preparing build environment..."
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cd "$SRC_DIR"
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# Copy running kernel's config
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zcat /proc/config.gz > .config 2>/dev/null || cp /boot/config-"$KERNEL_VER" .config 2>/dev/null || true
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if [[ ! -f .config ]]; then
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echo " ERROR: Could not find kernel config"
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exit 1
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fi
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# Prepare the build environment
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make LLVM=1 olddefconfig
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make LLVM=1 modules_prepare
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# ─────────────────────────────────────────────
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# 5. Apply BC-250 Patches
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# ─────────────────────────────────────────────
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echo "[5/7] Applying BC-250 patches..."
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echo " Applying patch 1: GFXOFF disable (gfx_v10_0.c)..."
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python3 "$PATCHES_DIR/patch1_gfxoff.py" "$AMDGPU_DIR"
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echo " Applying patch 2: KIQ bypass + dead-GPU (gmc_v10_0.c)..."
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python3 "$PATCHES_DIR/patch2_gmc.py" "$AMDGPU_DIR"
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echo " Applying patch 3: KIQ bypass + dead-GPU (amdgpu_gmc.c)..."
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python3 "$PATCHES_DIR/patch3_amdgpu_gmc.py" "$AMDGPU_DIR"
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echo " All patches applied."
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# ─────────────────────────────────────────────
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# 6. Build the amdgpu Module
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# ─────────────────────────────────────────────
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echo "[6/7] Building amdgpu module (LLVM=1)..."
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echo " This may take several minutes..."
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# Get number of CPU cores for parallel build
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NPROC=$(nproc)
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echo " Using $NPROC parallel jobs"
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make LLVM=1 -j"$NPROC" M=drivers/gpu/drm/amd/amdgpu modules 2>&1 | tail -20
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# Check build result
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MODULE="drivers/gpu/drm/amd/amdgpu/amdgpu.ko"
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if [[ ! -f "$MODULE" ]]; then
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echo " ERROR: Build failed — amdgpu.ko not found"
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echo " Check the build output above for errors."
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exit 1
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fi
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echo " Build successful!"
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ls -lh "$MODULE"
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# ─────────────────────────────────────────────
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# 7. Strip and Compress
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# ─────────────────────────────────────────────
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echo "[7/7] Stripping debug symbols and compressing..."
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strip --strip-debug "$MODULE"
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zstd -f --rm "$MODULE" -o "${MODULE}.zst"
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FINAL_MODULE="${MODULE}.zst"
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echo " Final module: $FINAL_MODULE"
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ls -lh "$FINAL_MODULE"
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echo ""
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echo "============================================"
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echo " Module built successfully!"
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echo "============================================"
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echo ""
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echo " Module: $(realpath "$FINAL_MODULE")"
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echo " Size: $(du -h "$FINAL_MODULE" | cut -f1)"
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echo ""
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echo "Next: Run 05_install_module.sh to install and reboot"
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echo " bash $SCRIPT_DIR/05_install_module.sh $(realpath "$FINAL_MODULE")"
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