Heat oil in heavy large skillet over medium-high heat. Season salmon with salt and pepper. Add to skillet; saute until just cooked through, about 3 minutes. Using slotted spoon, transfer salmon to plate. Add garlic to same skillet; saute 30 seconds. Add mushrooms, saute 2 minutes. Add green onions, tomato, wine and capers; cook until mushrooms are tender, about 5 minutes. Add linguine, dill, lemon juice, and salmon and toss.