In general, detailed performance analysis will require knoweldge of the the SoC beyond the CMN itself - e.g. which actual CPUs/peripherals/etc. are connected to each node. However for certain development and bringup tasks it can be useful to have a quick overview of the CMN internal topology to hand too. Add a debugfs file to map this out. Bug: 247832918 Change-Id: I022b4d5a2fc7fc93e397b0c99e162cb938ed0043 Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/159fd4d7e19fb3c8801a8cb64ee73ec50f55903c.1638530442.git.robin.murphy@arm.com Signed-off-by: Will Deacon <will@kernel.org> (cherry picked from commit a88fa6c28b867a387e3af202d6dbbb754d3aa2f1) Signed-off-by: Robin Peng <robinpeng@google.com>