drm/amdgpu: UALink use LSDMA to send remote interrupt command

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Add a use_lsdma flag to amdgpu_ualink_remote and set it during SDMA
entity initialization. When use_lsdma is set, use amdgpu_lsdma_copy_mem()
instead of SDMA IBs to write the remote command ring data, wptr and
doorbell to their respective NPA GART addresses.

This provides an alternative low-latency path for sending UALink remote
interrupt commands via LSDMA, avoiding SDMA ring/IB overhead for these
small NPA writes.

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 2026-06-02 07:24:22 -04:00 • committed by Alex Deucher

parent 27e8d24f65

commit 64f4f33652

1 changed files with 20 additions and 0 deletions

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

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