tree 57729514619945cb1480d9cfa7120de364ddc067
parent 3e7abe2556b583e87dabda3e0e6178a67b20d06f
author David Woodhouse <dwmw2@infradead.org> 1317003074 -0700
committer David Woodhouse <David.Woodhouse@intel.com> 1318621904 +0100

intel-iommu: Workaround IOTLB hang on Ironlake GPU

To work around a hardware issue, we have to submit IOTLB flushes while
the graphics engine is idle. The graphics driver will (we hope) go to
great lengths to ensure that it gets that right on the affected
chipset(s)... so let's not screw it over by deferring the unmap and
doing it later. That wouldn't be very helpful.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>