[Intel-gfx] iommu/vt-d: Use per-cpu IOVA caching, suspend-to-ram causes machine hang

[Adam Morrison]

> Hi Omer the following commit introduced a regression when doing
> suspend-to-ram. The machine never wakes up. We have more than
> a few machines that hang: SNB-i7-2620m, IVB-3370, HSW-4470r, BDW-5600u,
> BDW-525u.

Jan Niehusmann posted a patch that fixes a similar problem:

    http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1158159.html

Can you please try it and see if it does the trick for you?

Thanks,
Adam