OT plumbers. What is going on with my bathroom drainage?

only part of the house that seems to be affected is the upstairs bathroom on one side of the house.
When I was washing my hands, I noticed bubbling coming up from the toilet. Strange, but didnt think much of it. I come back to take a piss later and when I flush it backed up. I turned the water off to the toilet. I cant get it to drain even with a plunger. I noticed dirt in the bathtub, so I know water has recently backed up into the tub (we dont use this tub, we use on downstairs on the other wide of the house). I ran some tub water and it wont drain, just siting there.