Permanent Alien Registration

My son who is a US citizen and I am not a, I am an Itialian citizen with a permanent alien registration card would be traveling from LAX to Shanghi staying for 5 days and then going from Shanghi to Hong Kong for another 4 to 5 days before leaving from Hong Kong to LAX.

Please let me know if we would need visa for both places as well as for both of us. If so, could you provide the website or phone number to get the documenation needed....Thank you.