drm/amdgpu: Add UALink remote command packets and SDMA dispatch

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Add 16-dword packet layouts for TLB shootdown, remote interrupt, and
writeback address update. The dispatch path issues three sequential SDMA
copies (ring entry, write pointer, doorbell) and polls the firmware
writeback buffer for the acknowledged sequence number.

v2: fix 32 bit build (Alex)

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 13:37:11 -04:00 • committed by Alex Deucher

parent 3b53cbaabb

commit c5d7b2c766

1 changed files with 350 additions and 0 deletions

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

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