[PATCH v5 0/4] Improve test coverage of TTM

[Somalapuram, Amaranath]

On 10/16/2023 2:22 PM, Karolina Stolarek wrote:
> Add tests for building blocks of the TTM subsystem, such as ttm_resource,
> ttm_resource_manager, ttm_tt and ttm_buffer_object. This series covers
> basic functions such as initialization, allocation and clean-up of each
> struct. Testing of ttm_buffer_object also includes locking and unlocking
> the object for validation, with special scenarios such as an interrupted
> wait or deadlock.
>
> Some of the test cases check the bulk move mechanism and how it interacts
> with pinned buffers. This is to be seen if we want to add dedicated testing
> for bulk move or not. The resource allocation subtests use ttm_sys_manager
> for now. Resources that don't use system memory will be indirectly tested
> via tests for ttm_bo_validate()/ttm_bo_init_validate(), using a mock
> resource manager.
>
> Use kunit_tool script to manually run all the tests:
>
> $ ./tools/testing/kunit/kunit.py run --kunitconfig=drivers/gpu/drm/ttm/tests
>
> To build a kernel with TTM KUnit tests, first enable CONFIG_KUNIT, and
> then CONFIG_DRM_TTM_KUNIT_TEST.
Tested [PATCH v4 0/4] Improve test coverage of TTM patches on AMD 
platform, looks good.

Regards,
S.Amarnath
> Many thanks,
> Karolina
>
> v5:
>    - Actually use the page_flags parameter in ttm_tt_simple_create()
>
> v4:
>    - First unreserve the object before calling ww_acquire_fini() in
>      ttm_bo_reserve_double_resv subtest
>    - Silence lockdep in ttm_bo_reserve_deadlock subtest (open to suggestions
>      how to fix it in a different way)
>    - Use a genuine GEM object in ttm_buffer_object instead of an empty one
>
> v3:
>    - Instead of modifying the main TTM Makefile, use
>      EXPORT_SYMBOL_FOR_TESTS_ONLY() macro for symbols that are tested but
>      not widely exported. Thanks to this change, TTM tests can be built
>      as modules, even when non-exported functions are used
>    - Change the description of a patch that fixes ttm_pool_pre_populated()
>
> v2:
>    - Remove Makefile for KUnit tests and move the definitions to the
>      TTM's one
>    - Switch on CONFIG_DRM_TTM_KUNIT_TEST=m so the tests and TTM module
>      are built as one. This allows building the tests as a module, even
>      if it uses functions that are not exported
>    - Fix ttm_pool_pre_populated(); a wrong flag was passed to
>      ttm_tt_kunit_init() function
>
> Karolina Stolarek (4):
>    drm/ttm/tests: Add tests for ttm_resource and ttm_sys_man
>    drm/ttm/tests: Add tests for ttm_tt
>    drm/ttm/tests: Add tests for ttm_bo functions
>    drm/ttm/tests: Fix argument in ttm_tt_kunit_init()
>
>   drivers/gpu/drm/ttm/tests/Makefile            |   3 +
>   drivers/gpu/drm/ttm/tests/ttm_bo_test.c       | 619 ++++++++++++++++++
>   drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c |  51 +-
>   drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h |   4 +
>   drivers/gpu/drm/ttm/tests/ttm_pool_test.c     |   3 +-
>   drivers/gpu/drm/ttm/tests/ttm_resource_test.c | 335 ++++++++++
>   drivers/gpu/drm/ttm/tests/ttm_tt_test.c       | 295 +++++++++
>   drivers/gpu/drm/ttm/ttm_resource.c            |   3 +
>   drivers/gpu/drm/ttm/ttm_tt.c                  |   3 +
>   9 files changed, 1313 insertions(+), 3 deletions(-)
>   create mode 100644 drivers/gpu/drm/ttm/tests/ttm_bo_test.c
>   create mode 100644 drivers/gpu/drm/ttm/tests/ttm_resource_test.c
>   create mode 100644 drivers/gpu/drm/ttm/tests/ttm_tt_test.c
>