This series introduces KUnit[1] tests for TTM (Translation Table Manager) subsystem, a memory manager used by graphics drivers to create and manage memory buffers across different memory domains, such as system memory or VRAM. Unit tests implemented here cover two data structures: - ttm_device -- referred as a buffer object device, which stores resource managers and page pools - ttm_pool -- a struct of pools (ttm_pool_type) of different page orders and caching attributes, with pages that can be reused on the next buffer allocation Use kunit_tool script to manually run the tests: $ ./tools/testing/kunit/kunit.py run --kunitconfig=drivers/gpu/drm/ttm/tests To build a kernel with TTM KUnit tests, enable CONFIG_DRM_TTM_KUNIT_TEST symbol. As for now, tests are architecture-agnostic (i.e. KUnit runner uses UML kernel), which means that we have limited coverage in some places. For example, we can't fully test the initialization of global page pools, such as global_write_combined. It is to be decided if we want to stick to UML or use CONFIG_X86 (at least to some extent). These patches are just a beginning of the work to improve the test coverage of TTM. Feel free to suggest changes, test cases or priorities. Many thanks, Karolina -------------------------------- [1] - https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html Karolina Stolarek (3): drm/ttm: Introduce KUnit tests drm/ttm/tests: Add tests for ttm_device drm/ttm/tests: Add tests for ttm_pool drivers/gpu/drm/Kconfig | 15 + drivers/gpu/drm/ttm/Makefile | 1 + drivers/gpu/drm/ttm/tests/.kunitconfig | 4 + drivers/gpu/drm/ttm/tests/Makefile | 6 + drivers/gpu/drm/ttm/tests/ttm_device_test.c | 213 ++++++++++ drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c | 80 ++++ drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h | 34 ++ drivers/gpu/drm/ttm/tests/ttm_pool_test.c | 401 ++++++++++++++++++ 8 files changed, 754 insertions(+) create mode 100644 drivers/gpu/drm/ttm/tests/.kunitconfig create mode 100644 drivers/gpu/drm/ttm/tests/Makefile create mode 100644 drivers/gpu/drm/ttm/tests/ttm_device_test.c create mode 100644 drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c create mode 100644 drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h create mode 100644 drivers/gpu/drm/ttm/tests/ttm_pool_test.c -- 2.25.1