SOC DFT methodology

Hi,

What is the industry SOC DFT methodology to cover multiple physical blocks each one containing multiple IPs and using standard bus protocols like AXI, APB, AHB

and each physical block needing to communicate to other ones using AXI protocols ?

Develop DFT controller and scan chains for each big physical block (with many IPs)

and then use a master DFT controller to control each of the physical blocks and possibly control multiple DFT controllers together ?

How to ensure DFT works with busses like AXI which use point to point protocols and register slices might be inserted in the physical layout ?

Seems like multiple DFT controllers would need to coordinate working together in order to make this happen.

Any tips and recommendations are appreciated.

Thanks,

David