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b52b0debf7
The supplier and consumer relationships between devices on a system can be used for a variety of reasons: When modularizing drivers that are statically compiled into a kernel, knowing which devices are consumers of a particular supplier device establishes an order in which the drivers for those devices can be modularized in. Similarly, when enabling support for a system on a newer kernel, knowing this relationship can help establish the order in which drivers should be ported and enabled in the new kernel, with drivers for supplier devices being first. The relationship between devices and their drivers can also be used to identify an optimal module loading order after all of the device drivers have been modularized. Add a script that can identify the supplier and consumer relationships between devices, and output them in several useful formats. Bug: 240727741 Signed-off-by: Isaac J. Manjarres <isaacmanjarres@google.com> Change-Id: Ib5036e8b54f60c159c12775771447593f5a71c4c
128 lines
2.7 KiB
Bash
Executable File
128 lines
2.7 KiB
Bash
Executable File
#! /bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2022, Google LLC. All rights reserved.
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# Author: Isaac J. Manjarres <isaacmanjarres@google.com>
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DIR="$(dirname $(readlink -f $0))"
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DEV_NEEDS_HOST_PATH="${DIR}/dev-needs.sh"
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DEV_TMP_DIR="/data/local/tmp"
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DEV_NEEDS_DEV_PATH="${DEV_TMP_DIR}/$(basename ${DEV_NEEDS_HOST_PATH})"
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REVERSE_DRIVER_DEP_LIST=0
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WANT_MOD_LOAD_ORDER=0
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TSORTED_DEV_LIST=
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OUTPUT_LIST=
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prepare_device() {
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adb wait-for-device root >/dev/null
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if [ $? -ne 0 ]; then
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echo "Failed to root device"
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return 1
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fi
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adb push "${DEV_NEEDS_HOST_PATH}" "${DEV_TMP_DIR}/" >/dev/null
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if [ $? -ne 0 ]; then
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echo "Failed to push the dev-needs.sh script to the device"
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return 1
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fi
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return 0
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}
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cleanup_device() {
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adb shell "rm ${DEV_NEEDS_DEV_PATH}"
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}
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remove_duplicate_list_entries () {
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local list_entries="${1}"
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local tmp_list_file=$(mktemp)
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echo -n "${list_entries}" > "${tmp_list_file}"
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# Remove duplicates--except for the first occurrence--while keeping
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# the list in the same order
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OUTPUT_LIST=$(cat -n "${tmp_list_file}" | sort -uk2 | sort -n | cut -f2-)
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rm "${tmp_list_file}"
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}
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get_dev_compat() {
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local dev=$1
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local compat_str=$(adb shell "cat '$dev'/of_node/compatible 2>/dev/null" | tr -d '\0')
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if [ -n "${compat_str}" ]; then
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OUTPUT_LIST+="${compat_str}"$'\n'
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fi
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}
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devs_to_compat_list() {
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local dev_list="${1}"
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for dev in ${dev_list[@]}; do
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get_dev_compat "${dev}"
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done
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}
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get_dev_module_name() {
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local dev=$1
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local module_path=$(adb shell "realpath '$dev'/driver/module 2>/dev/null")
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if [ -n "${module_path}" ]; then
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OUTPUT_LIST+=$(basename "${module_path}")$'\n'
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fi
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}
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devs_to_module_list() {
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local dev_list="${1}"
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for dev in ${dev_list[@]}; do
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get_dev_module_name "${dev}"
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done
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}
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get_tsorted_dev_list() {
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local tsort_edges
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tsort_edges=$(adb shell ''${DEV_NEEDS_DEV_PATH}' -t\
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$(find /sys/devices -name driver | sed -e "s/\/driver//")')
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TSORTED_DEV_LIST=$(echo "${tsort_edges}" | tsort | sed -e "s/\"//g")
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}
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while getopts "s:rl" f; do
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case "$f" in
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s) export ANDROID_SERIAL="${OPTARG}" ;;
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r) REVERSE_DRIVER_DEP_LIST=1 ;;
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l) WANT_MOD_LOAD_ORDER=1 ;;
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esac
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done
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if [ $REVERSE_DRIVER_DEP_LIST = 1 ] && [ $WANT_MOD_LOAD_ORDER = 1 ]; then
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exit 1
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elif [ ! -f "${DEV_NEEDS_HOST_PATH}" ]; then
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echo "Kernel does not contain the required dev-needs.sh script"
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exit 1
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fi
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if ! prepare_device; then
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exit 1
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fi
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get_tsorted_dev_list
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if [ $WANT_MOD_LOAD_ORDER = 1 ]; then
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devs_to_module_list "${TSORTED_DEV_LIST}"
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else
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devs_to_compat_list "${TSORTED_DEV_LIST}"
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fi
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remove_duplicate_list_entries "${OUTPUT_LIST}"
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if [ $REVERSE_DRIVER_DEP_LIST = 1 ]; then
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echo "${OUTPUT_LIST}" | tac
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else
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echo "${OUTPUT_LIST}"
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fi
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cleanup_device
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