drm/amd/display: Test MMHUB config read

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[WHAT]
Add KUnit tests for the system aperture and GART configuration built by
mmhub_read_system_context(), covering the enabled and disabled AGP
aperture branches, the Raven2 and Renoir aperture workarounds, and the
GPUVM support flag.

[HOW]
Add struct amdgpu_dm_kunit_ops, a KUnit-only indirection table for
amdgpu_gmc_pd_addr(), which walks a live TTM buffer object back to its
device. Tests install a stub returning a fixed page directory address,
which makes the arithmetic reachable in the UML test environment. The
default table points at the existing AMDGPU function, so no test-only
wrapper is introduced.

Assisted-by: Copilot:Claude-Opus-5 GPT-5.6-Sol
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Alex Hung 2026-08-13 21:00:44 -06:00 • committed by Alex Deucher

parent d18cd30a82

commit 08fff7a45b

3 changed files with 161 additions and 2 deletions

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24

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

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11

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

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128

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

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