drivers/gpu/drm/ttm/tests/TODO

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/ttm/tests/TODO

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/ttm/tests/TODO
Extension
[no extension]
Size
1201 bytes
Lines
28
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: drivers/gpu
Status
atlas-only

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

TODO
=====

- Add a test case where the only evictable BO is busy
- Update eviction tests so they use parametrized "from" memory type
- Improve mock manager's implementation, e.g. allocate a block of
  dummy memory that can be used when testing page mapping functions
- Suggestion: Add test cases with external BOs
- Suggestion: randomize the number and size of tested buffers in
  ttm_bo_validate()
- Agree on the naming convention
- Rewrite the mock manager: drop use_tt and manage mock memory using
  drm_mm manager

Notes and gotchas
=================

- These tests are built and run with a UML kernel, because
  1) We are interested in hardware-independent testing
  2) We don't want to have actual DRM devices interacting with TTM
     at the same time as the test one. Getting these to work in
     parallel would require some time (...and that's a "todo" in itself!)
- Triggering ttm_bo_vm_ops callbacks from KUnit (i.e. kernel) might be
  a challenge, but is worth trying. Look at selftests like
  i915/gem/selftests/i915_gem_mman.c for inspiration
- The test suite uses UML where ioremap() call returns NULL, meaning that
  ttm_bo_ioremap() can't be tested, unless we find a way to stub it

Annotation

Implementation Notes