drm/amdkfd: Add domain parameter to kernel BO mapping function

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This change allows amdgpu_amdkfd_gpuvm_map_bo_to_kernel() to pin buffers
in either GTT or VRAM based on caller specification, providing flexibility
for different memory placement requirements across various kernel buffers.

The domain parameter accepts AMDGPU_GEM_DOMAIN_GTT, AMDGPU_GEM_DOMAIN_VRAM,
or their combination (GTT|VRAM) to let amdgpu_bo_pin() choose the optimal
placement via amdgpu_bo_get_preferred_domain(). This flexible validation
allows callers to specify their preference while delegating final placement
decisions to the driver when appropriate.

CPU visibility is automatically enforced by amdgpu_bo_pin() regardless of
the domain parameter (see amdgpu_bo_pin() line 975-976 which sets
AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED for kernel mappings).

-v3: update amdgpu_amdkfd_gpuvm_map_bo_to_kernel description

Signed-off-by: James Zhu <James.Zhu@amd.com>
Reviewed-by: Vladimir Indic <vladimir.indic@amd.com>
Reviewed-by: Philip Yang <philip.yang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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This commit is contained in:

James Zhu 2025-09-25 16:13:58 -04:00 • committed by Alex Deucher

parent 991e0516a8

commit f8f759426b

4 changed files with 26 additions and 16 deletions

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6

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h

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20

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c

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5

drivers/gpu/drm/amd/amdkfd/kfd_events.c

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11

drivers/gpu/drm/amd/amdkfd/kfd_process.c

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