amdgpu_fence_read
seq = amdgpu_fence_read(ring);
while ((int32_t)(wait_seq - amdgpu_fence_read(ring)) > 0 && timeout > 0) {
last_seq = amdgpu_fence_read(ring) & ring->fence_drv.num_fences_mask;
last_seq = amdgpu_fence_read(ring) & ring->fence_drv.num_fences_mask;