SSRS - Dataset(s) order of execution

I have a report that runs a Stored Procedu开发者_如何转开发re in Oracle. This procedure fills several tables with data in Oracle. I then want to query those tables and load several Tablix(s) in my SSRS report. I need the Stored Proc to run first. How can I ensure the Stored Proc runs before the DataSet queries that I use to fill the Tablix(s)?