Tomato leaf roll is a common sign of a stressed plant. It is physiological response on the part of the plant and there are many discussions here about it (linked some below). It causes no permanent damage to the plant.

ID the source of the stress and remove it and the condition goes away. Common causes are too much or too little water, root bound plants, soil temps too high, pests, too much fertilizer, etc.

If you Google 'tomato leaf roll' you'll find lots of good info on it.

Dave

Here is a link that might be useful: Leaf roll discussions