Hi, for this v3 I changed the approach for identifying devices in a stable way from the match fields back to the hardware topology (used in v1). The match fields were proposed as a way to avoid the possible issue of PCI topology being reconfigured, but that wasn't observed on any real system so far. However using match fields does allow for a real issue if an external device similar to an internal one is connected to the system, which results in a change of the match count and therefore a test failure. So using the HW topology was chosen as the most reliable approach. The per-platform device description file now uses YAML following a suggestion from Chris Obbard, and the test script was re-written in python to handle the new YAML format. A second sample board file is also now included for an x86 platform, which contains an USB controller behind a PCI controller, which wasn't possible to describe in v1. Thanks, Nícolas v2: https://lore.kernel.org/all/20231127233558.868365-1-nfraprado@xxxxxxxxxxxxx v1: https://lore.kernel.org/all/20231024211818.365844-1-nfraprado@xxxxxxxxxxxxx Original cover letter: This is part of an effort to improve detection of regressions impacting device probe on all platforms. The recently merged DT kselftest [3] detects probe issues for all devices described statically in the DT. That leaves out devices discovered at run-time from discoverable busses. This is where this test comes in. All of the devices that are connected through discoverable busses (ie USB and PCI), and which are internal and therefore always present, can be described in a per-platform file so they can be checked for. The test will check that the device has been instantiated and bound to a driver. Patch 1 introduces the test. Patch 2 and 3 add the device definitions for the google,spherion machine (Acer Chromebook 514) and XPS 13 as examples. This is the output from the test running on Spherion: TAP version 13 Using board file: boards/google,spherion.yaml 1..8 ok 1 /usb2-controller@11200000/1.4.1/camera.device ok 2 /usb2-controller@11200000/1.4.1/camera.0.driver ok 3 /usb2-controller@11200000/1.4.1/camera.1.driver ok 4 /usb2-controller@11200000/1.4.2/bluetooth.device ok 5 /usb2-controller@11200000/1.4.2/bluetooth.0.driver ok 6 /usb2-controller@11200000/1.4.2/bluetooth.1.driver ok 7 /pci-controller@11230000/0.0/0.0/wifi.device ok 8 /pci-controller@11230000/0.0/0.0/wifi.driver Totals: pass:8 fail:0 xfail:0 xpass:0 skip:0 error:0 [3] https://lore.kernel.org/all/20230828211424.2964562-1-nfraprado@xxxxxxxxxxxxx/ Changes in v3: - Reverted approach of encoding stable device reference in test file from device match fields (from modalias) back to HW topology (from v1) - Changed board file description to YAML - Rewrote test script in python to handle YAML and support x86 platforms Changes in v2: - Changed approach of encoding stable device reference in test file from HW topology to device match fields (the ones from modalias) - Better documented test format Nícolas F. R. A. Prado (3): kselftest: Add test to verify probe of devices from discoverable busses kselftest: devices: Add sample board file for google,spherion kselftest: devices: Add sample board file for XPS 13 9300 tools/testing/selftests/Makefile | 1 + tools/testing/selftests/devices/Makefile | 4 + .../devices/boards/Dell Inc.,XPS 13 9300.yaml | 40 +++ .../devices/boards/google,spherion.yaml | 50 +++ tools/testing/selftests/devices/ksft.py | 90 +++++ .../devices/test_discoverable_devices.py | 318 ++++++++++++++++++ 6 files changed, 503 insertions(+) create mode 100644 tools/testing/selftests/devices/Makefile create mode 100644 tools/testing/selftests/devices/boards/Dell Inc.,XPS 13 9300.yaml create mode 100644 tools/testing/selftests/devices/boards/google,spherion.yaml create mode 100644 tools/testing/selftests/devices/ksft.py create mode 100755 tools/testing/selftests/devices/test_discoverable_devices.py -- 2.43.0
