Coverpoint for interface signal

I need help with writing a single cover group and cover point for a signal declared in the interface, assuming coverage is declared in a class and interface signal is set in the top and get it in the coverage class itself. can someone help me with this?

In reply to sundarji:

It is not really clear to me what your problem is. If you are implementing a covergroup in your monitor you have all signals of the virtual inetrface available.