Add Report Server Content Types to a Library (Reporting Services in SharePoint Integrated Mode)

To configure Reporting Services against an existing Sharepoint 2010 farm, you need to go to the root site and enable the proper features.  Then configure libraries in subsites to expose the proper content types (Report Builder Model, Report, Data Source).

It can get a bit tricky.  Here are some links.

http://blog.cloudshare.com/2012/05/22/step-by-step-guide-to-installing-sharepoint-with-sql-2012-powerpivot-powerview-and-reporting-services/

Add Report Server Content Types to a Library (Reporting Services in SharePoint Integrated Mode)