Build a QCOM GKI kernel with external modules and generate the module.load files

kernel-build.sh

#!/bin/bash

set -e

KERNEL_TOOLS=/home/daniel/android/lineage-21.0/prebuilts/kernel-build-tools/linux-x86/bin/
CLANG_PATH=/home/daniel/android/lineage-21.0/prebuilts/clang/host/linux-x86/clang-r487747c/bin/

export PATH="$KERNEL_TOOLS:$CLANG_PATH:$PATH"

TARGET=$1
KERNEL_SRC=$(pwd)
O=out
OUT_DIR=$KERNEL_SRC/$O
INSTALL_MOD_PATH=modules_out

if [[ "$TARGET" == "socrates" ]]; then
    TARGET_DEFCONFIG="gki_defconfig vendor/kalama_GKI.config vendor/socrates_GKI.config"
    TARGET_KERNEL_EXT_MODULES="
    	qcom/opensource/mmrm-driver
    	qcom/opensource/mm-drivers/hw_fence
    	qcom/opensource/mm-drivers/msm_ext_display
    	qcom/opensource/mm-drivers/sync_fence
    	qcom/opensource/audio-kernel
    	qcom/opensource/camera-kernel
    	qcom/opensource/dataipa/drivers/platform/msm
    	qcom/opensource/datarmnet/core
    	qcom/opensource/datarmnet-ext/aps
    	qcom/opensource/datarmnet-ext/offload
    	qcom/opensource/datarmnet-ext/shs
    	qcom/opensource/datarmnet-ext/perf
    	qcom/opensource/datarmnet-ext/perf_tether
    	qcom/opensource/datarmnet-ext/sch
    	qcom/opensource/datarmnet-ext/wlan
    	qcom/opensource/securemsm-kernel
    	qcom/opensource/display-drivers/msm
    	qcom/opensource/eva-kernel
    	qcom/opensource/video-driver
    	qcom/opensource/graphics-kernel
    	qcom/opensource/wlan/platform
    	qcom/opensource/wlan/qcacld-3.0/.kiwi_v2
    	qcom/opensource/bt-kernel
    	nxp/opensource/driver"
    TARGET_KERNEL_EXT_MODULE_ROOT=$KERNEL_SRC/../socrates-modules
    FIRST_STAGE_MODULES_LIST="modules.list.msm.kalama"
    RECOVERY_EXT_MODULES="msm_drm.ko"
else
    echo "Unknown target $TARGET"
    exit 1
fi

function section() {
    local input="$1"
    local length=${#input}

    printf '%*s\n' "$length" '' | tr ' ' '='
    echo "$input"
    printf '%*s\n' "$length" '' | tr ' ' '='
}

function kernel_make() {
    make -j$(nproc) \
        O=$O \
        ARCH=arm64 \
        LLVM=1 \
        LLVM_IAS=1 \
        CROSS_COMPILE=aarch64-linux-gnu- \
        CROSS_COMPILE_ARM32=arm-linux-gnueabi- \
        INSTALL_MOD_PATH=$INSTALL_MOD_PATH \
        $@ < /dev/null
}

function ext_module_make() {
    module_path=$TARGET_KERNEL_EXT_MODULE_ROOT/$1

    kernel_make \
        OUT_DIR=$OUT_DIR \
        KERNEL_SRC=$KERNEL_SRC \
        KERNEL_UAPI_HEADERS_DIR=$OUT_DIR \
        M=$(realpath --relative-to=$KERNEL_SRC $module_path) \
        -C $module_path \
        ${@:2}
}

function get_modlib_file_path() {
    local file_path=$(echo $OUT_DIR/$INSTALL_MOD_PATH/**/**/**/$1)

    if [[ $(echo $file_path | wc -w) -ne 1 ]]; then
        echo "None or multiple files were found for $1 on modlib: $file_path"
        exit 1
    fi

    echo $file_path
}

function generate_module_deps() {
    modules_dep_file=$(get_modlib_file_path modules.dep)
    if [[ "$(grep -e "^$1:" -e "/$1:" $modules_dep_file)" == "" ]]; then
        echo "Needed $1 was not found in modules.dep"
        exit 1
    fi

    module_data=$(grep -e "^$1:" -e "/$1:" $(get_modlib_file_path modules.dep))
    module_name=$(basename $1)

    if [[ -f $2 ]] && [[ "$(grep "^$module_name" $2)" != "" ]]; then
        return
    fi

    echo $module_name >> $2

    # Generate the module dependencies
    module_deps=$(echo $module_data | cut -d ":" -f 2)
    for dep in $module_deps; do
        generate_module_deps $dep $2
    done
}

function generate_modules_load() {
    modules_order_file=$(get_modlib_file_path modules.order)
    modules_dep_file=$(get_modlib_file_path modules.dep)
    rm -f $OUT_DIR/modules.load.*

    #
    # First stage modules
    # Get modules from FIRST_STAGE_MODULES_LIST and remove non existing ones
    #
    echo "Generating first stage modules list at $OUT_DIR/modules.load.first_stage"
    for mod in $(cat $FIRST_STAGE_MODULES_LIST); do
        if [[ "$(grep -e "^$mod:" -e "/$mod:" $(get_modlib_file_path modules.dep))" != "" ]]; then
            generate_module_deps $mod $OUT_DIR/modules.load.first_stage
        fi
    done

    #
    # Recovery modules (first stage + ext recovery modules)
    #
    echo "Generating recovery modules list at $OUT_DIR/modules.load.recovery"
    cat $modules_order_file | rev | cut -d / -f 1 | rev > $OUT_DIR/modules.load.recovery
    for ext_mod in $RECOVERY_EXT_MODULES; do
        generate_module_deps $ext_mod $OUT_DIR/modules.load.recovery
    done

    #
    # Vendor DLKM modules (non-first-stage modules + extra/ modules)
    #
    echo "Generating vendor DLKM modules list at $OUT_DIR/modules.load.vendor_dlkm"
    ext_modules=$(cat $modules_dep_file | cut -d ":" -f 1)
    for ext_mod in $ext_modules; do
        generate_module_deps $ext_mod $OUT_DIR/modules.load.vendor_dlkm
    done

    # Remove first stage modules from vendor_dlkm
    for mod in $(cat $OUT_DIR/modules.load.first_stage); do
        sed -i /$mod/d $OUT_DIR/modules.load.vendor_dlkm
    done
}

if [[ -z $TARGET_DEFCONFIG ]] || [[ -z $TARGET_KERNEL_EXT_MODULES ]] || [[ -z $TARGET_KERNEL_EXT_MODULE_ROOT ]] || [[ -z $FIRST_STAGE_MODULES_LIST ]]; then
    echo "Misconfigured target, make sure that all needed variables are set"
    exit 1
fi

section "Kernel config"
make O=$O ARCH=arm64 $TARGET_DEFCONFIG

section "Kernel build"
kernel_make

section "Kernel modules install"
kernel_make modules_install

section "External kernel modules build"
echo "Module root is $TARGET_KERNEL_EXT_MODULE_ROOT"
for module in $TARGET_KERNEL_EXT_MODULES; do
    section "Building $module"
    ext_module_make $module

    section "Installing $module"
    ext_module_make $module modules_install
done

section "Generating modules.load files"
generate_modules_load