drm/amdgpu: Add UALink NPA VM mapping for ring buffers

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Populate the NPA VM so remote GPUs can access local ring buffers and
write pointer pages at their reserved NPA addresses. Teardown waits for
DMA fences and issues a heavyweight TLB flush.

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>

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Philip Yang 2026-03-25 13:37:09 -04:00 • committed by Alex Deucher

parent 5d7094267d

commit ee9323733a

2 changed files with 432 additions and 0 deletions

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429

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

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3

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

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