dma_fence_timestamp
ktime_t t = dma_fence_timestamp(tmp);
ktime_t t = dma_fence_timestamp(tmp);
ktime_to_ns(dma_fence_timestamp(fence)) :
start = dma_fence_timestamp(&s_fence->scheduled);
end = dma_fence_timestamp(&s_fence->finished);
dma_fence_timestamp(&job->s_fence->finished);