Add new kselftest that tests whether devices declared in the ACPI namespace and supported by the kernel are correctly bound to a driver.
The test traverses the ACPI sysfs tree to get a list of all the devices defined in the ACPI namespace and verifies whether the physical devices linked to each ACPI object are bound to a driver. The test relies on two lists to skip devices not expected to be bound to a driver: - List generated by the acpi-extract-ids script: includes the ACPI IDs matched by a driver - Manual list of ignored IDs: includes the ID of devices that may be discovered only via the platform firmware and that don't require a driver or cannot be represented as platform devices The test also examines the sysfs attributes of the target device objects linked by physical_node* to exclude other devices that should not be bound to a driver. This includes: - Devices not assigned to any subsystem - Devices that are linked to other devices - Class devices - Specific PCI bridges that do not require a driver Signed-off-by: Laura Nao <[email protected]> --- MAINTAINERS | 1 + tools/testing/selftests/Makefile | 1 + tools/testing/selftests/acpi/.gitignore | 1 + tools/testing/selftests/acpi/Makefile | 21 +++ tools/testing/selftests/acpi/id_ignore_list | 3 + .../selftests/acpi/test_unprobed_devices.sh | 138 ++++++++++++++++++ 6 files changed, 165 insertions(+) create mode 100644 tools/testing/selftests/acpi/.gitignore create mode 100644 tools/testing/selftests/acpi/Makefile create mode 100644 tools/testing/selftests/acpi/id_ignore_list create mode 100755 tools/testing/selftests/acpi/test_unprobed_devices.sh diff --git a/MAINTAINERS b/MAINTAINERS index 8333ead448c4..1f58949c9e51 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -294,6 +294,7 @@ F: include/linux/fwnode.h F: include/linux/fw_table.h F: lib/fw_table.c F: scripts/acpi/acpi-extract-ids +F: tools/testing/selftests/acpi/ F: tools/power/acpi/ ACPI APEI diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile index e1504833654d..3107301ea4f3 100644 --- a/tools/testing/selftests/Makefile +++ b/tools/testing/selftests/Makefile @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 +TARGETS += acpi TARGETS += alsa TARGETS += amd-pstate TARGETS += arm64 diff --git a/tools/testing/selftests/acpi/.gitignore b/tools/testing/selftests/acpi/.gitignore new file mode 100644 index 000000000000..3c520e8a1962 --- /dev/null +++ b/tools/testing/selftests/acpi/.gitignore @@ -0,0 +1 @@ +id_list diff --git a/tools/testing/selftests/acpi/Makefile b/tools/testing/selftests/acpi/Makefile new file mode 100644 index 000000000000..b80d4fb797ac --- /dev/null +++ b/tools/testing/selftests/acpi/Makefile @@ -0,0 +1,21 @@ +PY3 = $(shell which python3 2>/dev/null) + +ifneq ($(PY3),) + +TEST_PROGS := test_unprobed_devices.sh +TEST_GEN_FILES := id_list +TEST_FILES := id_ignore_list + +include ../lib.mk + +$(OUTPUT)/id_list: + $(top_srcdir)/scripts/acpi/acpi-extract-ids -d $(top_srcdir) > $@ + +else + +all: no_py3_warning + +no_py3_warning: + @echo "Missing python3. This test will be skipped." + +endif \ No newline at end of file diff --git a/tools/testing/selftests/acpi/id_ignore_list b/tools/testing/selftests/acpi/id_ignore_list new file mode 100644 index 000000000000..86ddf4b0a55a --- /dev/null +++ b/tools/testing/selftests/acpi/id_ignore_list @@ -0,0 +1,3 @@ +PNP0A05 +PNP0A06 +ACPI0004 \ No newline at end of file diff --git a/tools/testing/selftests/acpi/test_unprobed_devices.sh b/tools/testing/selftests/acpi/test_unprobed_devices.sh new file mode 100755 index 000000000000..23e52833c475 --- /dev/null +++ b/tools/testing/selftests/acpi/test_unprobed_devices.sh @@ -0,0 +1,138 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# +# Copyright (c) 2023 Collabora Ltd +# +# Inspired by the tools/testing/selftests/dt/test_unprobed_devices.sh +# script, adapted for the ACPI use case. +# +# This script checks whether devices declared in the ACPI namespace and +# supported by the kernel are correctly bound to a driver. +# +# To do this, two lists are used: +# * a list of ACPI IDs matched by existing drivers +# * a list of IDs that should be ignored +# + +DIR="$(dirname "$(readlink -f "$0")")" + +KTAP_HELPERS="${DIR}/../kselftest/ktap_helpers.sh" +if ! source "$KTAP_HELPERS"; then + exit 4 +fi + +ACPI_SYSTEM_DIR="/sys/devices/LNXSYSTM:00" +ID_IGNORE_LIST="${DIR}"/id_ignore_list +ID_LIST="${DIR}"/id_list + +PCI_CLASS_BRIDGE_HOST="0x0600" +PCI_CLASS_BRIDGE_ISA="0x0601" + +ktap_print_header + +if [[ ! -d "${ACPI_SYSTEM_DIR}" ]]; then + ktap_skip_all "${ACPI_SYSTEM_DIR} doesn't exist." + exit "${KSFT_SKIP}" +fi + +# The ACPI specification mandates that ACPI objects representing devices on +# non-enumerable and enumerable busses contain a _HID or an _ADR +# identification object respectively. Get a list of devices of both types, +# by searching the ACPI sysfs subtree for directories containing a hid or +# adr attribute. +supp_dev_paths=$(while IFS=$'\n' read -r dev_path; do + if [ ! -f "${dev_path}"/hid ] && [ ! -f "${dev_path}"/adr ]; then + continue + fi + + # Check if the device is present, enabled, and functioning properly + status="${dev_path}/status" + if [ -f "${status}" ]; then + status_hex=$(($(cat "${status}"))) + + if [ $((status_hex & 1)) -eq 0 ] || + [ $((status_hex >> 1 & 1)) -eq 0 ] || + [ $((status_hex >> 3 & 1)) -eq 0 ]; then + continue + fi + fi + + if [ -n "$(find -L "${dev_path}" -maxdepth 1 -name "physical_node*" -print -quit)" ]; then + for node in "${dev_path}"/physical_node*; do + # Ignore devices without a subsystem, devices that link to + # other devices, and class devices + if [ ! -d "${node}/subsystem" ] || + [ -d "${node}/device" ] || + [[ "$(readlink -f "${node}/subsystem")" == /sys/class/* ]]; then + continue + fi + + echo "${node}" + done + fi +done < <(find ${ACPI_SYSTEM_DIR} -name uevent -exec dirname {} \;)) + +supp_dev_paths_num=$(echo "${supp_dev_paths}" | wc -w) +ktap_set_plan "${supp_dev_paths_num}" + +# Iterate over ACPI devices +for dev_path in ${supp_dev_paths}; do + if [ -f "${dev_path}/firmware_node/path" ]; then + acpi_path="$(<"${dev_path}"/firmware_node/path)" + fi + + dev_link=$(readlink -f "${dev_path}") + desc="${acpi_path}-${dev_link#/sys/devices/}" + + if [ -f "${dev_path}/firmware_node/hid" ]; then + hid="$(<"${dev_path}"/firmware_node/hid)" + + if [ -f "${dev_path}/firmware_node/modalias" ]; then + modalias=$(<"${dev_path}/firmware_node/modalias") + cid=$(echo "${modalias}" | cut -d':' -f3) + + # Skip devices with ignored HID/CID + if ignored_id=$(grep -i "${hid}" "${ID_IGNORE_LIST}" || + { [ -n "${cid}" ] && grep -i "${cid}" "${ID_IGNORE_LIST}"; }); then + ktap_print_msg "ID ${ignored_id} ignored [SKIP]" + ktap_test_skip "${desc}" + continue + fi + # Skip devices with unsupported HID/CID + if [[ "${hid}" != LNX* ]] && ! grep -x -q -i "${hid}" "${ID_LIST}"; then + if [ -z "${cid}" ] || ! grep -x -q -i "${cid}" "${ID_LIST}"; then + ktap_print_msg "no match for ${hid}${cid:+:${cid}} found \ + in the supported IDs list [SKIP]" + ktap_test_skip "${desc}" + continue + fi + fi + fi + fi + + # Skip bridges that don't require a driver + if [ -f "${dev_path}/class" ]; then + class=$(<"${dev_path}"/class) + if [[ ${class} == ${PCI_CLASS_BRIDGE_HOST}* ]] || + [[ ${class} == ${PCI_CLASS_BRIDGE_ISA}* ]]; then + ktap_print_msg "device linked to ${desc} does not require a driver [SKIP]" + ktap_test_skip "${desc}" + continue + fi + fi + + # Search for the driver in both the device folder and the companion's folder + if [ -d "${dev_path}/driver" ] || [ -d "${dev_path}/firmware_node/driver" ]; then + ktap_test_pass "${desc}" + # Skip char devices + elif [ -f "${dev_path}/dev" ]; then + ktap_print_msg "${desc} is a char device [SKIP]" + ktap_test_skip "${desc}" + continue + else + ktap_test_fail "${desc}" + fi + +done + +ktap_finished -- 2.30.2
