drm/amd/display: Test VBIOS bounding box

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[WHAT]
Add KUnit tests for dm_dmub_get_vbios_bounding_box(), covering the
successful handshake on every ASIC that has a bounding box, the GPU
memory allocation failure path, and both GPINT timeout paths. This also
covers dm_dmub_send_vbios_gpint_command().

[HOW]
Extend the fake CGS device with a fail_on_write hook so a chosen GPINT
write is never acked, which drives the timeout paths without waiting on
real firmware. Reuse the buffer object indirection added for
dm_allocate_gpu_mem() with a fake allocator, since the real path needs a
live TTM device.

The success test walks every ASIC with a bounding box and confirms a
non-zero GART buffer is allocated and that all four address words plus
the copy request are sent. The timeout tests confirm the buffer is
released and the allocation list left empty.

Assisted-by: Copilot:Claude-Opus-5
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Alex Hung 2026-08-11 11:48:04 -06:00 • committed by Alex Deucher

parent b62da90db8

commit 7527232a60

1 changed files with 187 additions and 0 deletions

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drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_dmub_test.c

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