drm/amdkfd: Remove svm_bo eviction fence

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SVM BOs are now migrated back to system memory synchronously from the TTM
eviction path (svm_range_evict_svm_bo), so the per-svm_bo eviction fence
is no longer used.

Remove the eviction fence from svm_range_bo, drop the
amdgpu_amdkfd_fence->svm_bo back pointer and the
amdgpu_amdkfd_evict_svm_bo() helper, and stop special-casing svm_bo
fences in the KFD fence enable_signaling and check_mm paths. Embed struct
amdgpu_bo directly in svm_range_bo with a dedicated svm_range_bo_destroy()
callback, and keep the owning mm via mmgrab()/mmdrop() instead of through
the fence.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Philip Yang 2026-07-17 20:54:51 -04:00 • committed by Alex Deucher

parent 74f28db2db

commit 6aabceae65

9 changed files with 64 additions and 115 deletions

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21

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

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3

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

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15

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

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4

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

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4

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

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6

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

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4

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

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109

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

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13

drivers/gpu/drm/amd/amdkfd/kfd_svm.h

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