Regressions that prevent a driver from probing a device can significantly affect the functionality of a platform. A kselftest to verify if devices on a DT-based platform are probed correctly was recently introduced [1], but no such generic test is available for ACPI platforms yet. bootrr [2] provides device probe testing, but relies on a pre-defined list of the peripherals present on each DUT. On ACPI based hardware, a complete description of the platform is provided to the OS by the system firmware. ACPI namespace objects are mapped by the Linux ACPI subsystem into a device tree in /sys/devices/LNXSYSTEM:00; the information in this subtree can be parsed to build a list of the hw peripherals present on the DUT dynamically. This series adds a test to verify if the devices declared in the ACPI namespace and supported by the kernel are probed correctly. This work follows a similar approach to [1], adapted for the ACPI use case. The first patch introduces a script that builds a list of all ACPI device IDs supported by the kernel, by inspecting the acpi_device_id structs in the sources. This list can be used to avoid testing ACPI-enumerated devices that don't have a matching driver in the kernel. This script was highly inspired by the dt-extract-compatibles script [3]. In the second patch, a new kselftest is added. It parses the /sys/devices/LNXSYSTEM:00 tree to obtain a list of all platform peripherals and verifies which of those, if supported, are correctly bound to a driver. Feedback is much appreciated, Thank you, Laura [1] https://lore.kernel.org/all/20230828211424.2964562-1-nfraprado@xxxxxxxxxxxxx/ [2] https://github.com/kernelci/bootr [3] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/scripts/dtc/dt-extract-compatibles Laura Nao (2): acpi: Add script to extract ACPI device ids in the kernel kselftest: Add test to detect unprobed devices on ACPI platforms MAINTAINERS | 2 + scripts/acpi/acpi-extract-ids | 60 +++++++++++++++ tools/testing/selftests/Makefile | 1 + tools/testing/selftests/acpi/.gitignore | 2 + tools/testing/selftests/acpi/Makefile | 23 ++++++ .../selftests/acpi/test_unprobed_devices.sh | 75 +++++++++++++++++++ 6 files changed, 163 insertions(+) create mode 100755 scripts/acpi/acpi-extract-ids create mode 100644 tools/testing/selftests/acpi/.gitignore create mode 100644 tools/testing/selftests/acpi/Makefile create mode 100755 tools/testing/selftests/acpi/test_unprobed_devices.sh -- 2.30.2
