[PATCH v3] Added perf functionality to mmdc driver

[Zhengyu Shen]

> > Mmdc was only responsible for one crash which I fixed (had to remove
> > the event from the pmu properly).
> 
> Ok. I take it that there will be a v4 appearing shortly with that fix?

Hopefully I'll get that out by the end of today. 
 
> Crashes are very bad. Do you have any logs from those crashes in other
> drivers that you can share?

It seems my kernel source was out of date, updating it seems to have fixed 
The issue.