Search for Power Pivot Configuration Tool on the server under the start menu and open it. Click Configure the “Configure or Repair PowerPivot for SharePoint”
Let the PowerPivot Configuration Tool run.
Click validate in the bottom right to see if everything tests out alright.
Next make sure to that each farm solution is deployed. In Central Admin, navigate to System Settings -> Manage Farm Solutions
Make sure the farm solution (WSP file) named PowerPivotWebApplicationSolution is deployed to the web application that you would like.
Next navigate to Site Collection Features and activate two features PowerPivot Feature Integration for Site Collections and PowerView Integration Feature.
Now go on and create Power Pivot reports or Power View reports based on BI Semantic model data connections!