Is there any documentation about nv_peer_mem and nvidia_peermem?

Is there any documentation about nv_peer_mem and nvidia_peermem?
I am currently reading GPUDirectRDMA document(Ref1)

Both kernel modules are API compatible or not?If it is not compatible is there any documentation describing it?

Ref 1

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It is possible that the nv_peer_mem module from the GitHub project may be installed and loaded on the system. Installation of nvidia-peermem will not affect the functionality of the existing nv_peer_mem module.But, to load and use nvidia-peermem, users must disable the nv_peer_mem service.
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https://docs.nvidia.com/cuda/gpudirect-rdma/index.html#nvidia-peermem