drm/i915: Add contexts for HSW

Basic context support on HSW is no different than previous generations.
The size of the context object changes, but that's about it.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 5d0d6ad..5c2d354 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -112,7 +112,10 @@
 		break;
 	case 7:
 		reg = I915_READ(GEN7_CXT_SIZE);
-		ret = GEN7_CXT_TOTAL_SIZE(reg) * 64;
+		if (IS_HASWELL(dev))
+			ret = HSW_CXT_TOTAL_SIZE(reg) * 64;
+		else
+			ret = GEN7_CXT_TOTAL_SIZE(reg) * 64;
 		break;
 	default:
 		BUG();