james prince

*We’re not sure if this is partly a joke or serious business.

Drake’s longtime mentor, Rap-A-Lot Records CEO James Prince, just went in on Diddy, Suge Knight, Lil Wayne and Birdman in a diss track that doesn’t pull any punches. In fact, if something happens to the afore mentioned, it could be used as evidence.

Prince – who may be positioning himself as rap’s Suge Knighht replacemnrt – recently recorded the warning track, which he labels a “courtesy message,” and naturally TMZ got a hold of a copy (hear it below).

Sources connected to J. Prince tell us this has been simmering since Diddy punched Drake outside LIV Nightclub back in December. On the track, Prince makes it clear Drizzy is “family,” and adds … “Puffy feeling like he can put his hands on my family, open the doors for his family to be touched. You reap what you sow.”

That’s just the start … he goes in on Weezy and Birdman — with whom he’s had a long-running legal war — and also rips “Sugar Bear” for a not-so-subtle jab at Drake he made to a TMZ camera guy.

Even Mr. Prince would never think of signing himself for his spittin ‘ skills … or lack thereof, but he gets his point across … loud and clear … and with a beat, too.

Check it out below: