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Add NOUVEAU_FIFO_ENGINE_NVDEC to the abi16 uAPI and accept it in channel allocation, mapping it to the NVDEC engine runlist. Skip the Turing copy-engine workaround object for NVDEC channels: the copy engines are not part of the NVDEC runlist, so the workaround object cannot be instantiated on such channels (and is not needed there). This is required for NVK to implement Vulkan Video H.264 decode on top of the NVDEC engine: https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31867 Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com> Signed-off-by: Dave Airlie <airlied@redhat.com> Link: https://patch.msgid.link/20260725035912.1016464-1-daniel.almeida@collabora.com