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On multi-socket platforms each socket has its own BPMP that is registered with the kernel, so the existing single fixed "bpmp" debugfs directory name cannot accommodate more than one instance. Group the per-socket BPMP debugfs entries under a shared top-level /sys/kernel/debug/bpmp/ directory, with each socket's BPMP device under a "<numa-node-id>-bpmp" subdirectory: /sys/kernel/debug/bpmp/0-bpmp/... /sys/kernel/debug/bpmp/1-bpmp/... For a multi-socket platform, the root debugfs bpmp/ directory is created by the first BPMP device that is populated. For single-socket platforms, the existing directory structure is preserved. Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>