drm/amdgpu: create UALink NPA import BO directly in the NPA domain

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amdgpu_ualink_map_npa_to_dmabuf() created the NPA import BO in the
CPU/SYSTEM domain and then moved it to NPA. SYSTEM is use_tt=true, so TTM
attaches a host-page ttm_tt that the null move to NPA leaves behind. On
dma-buf export, ttm_bo_populate() then fills that ttm_tt with system
pages, spiking host RAM by the entire NPA window size.

Create the BO directly in the NPA domain (use_tt=false) so no ttm_tt is
ever attached, and relocate it to the exact remote window.

Signed-off-by: Mukul Joshi <mukul.joshi@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Mukul Joshi 2026-08-10 14:35:55 -04:00 • committed by Alex Deucher

parent 74a6f99cf3

commit dbec62b36b

1 changed files with 18 additions and 11 deletions

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

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