[Intel-gfx] [PATCH 1/4] intel-iommu: Workaround IOTLB hang on Ironlake GPU

2011-10-17 Thread Ben Widawsky
From: David Woodhouse 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 do

[Intel-gfx] [PATCH 1/4] intel-iommu: Workaround IOTLB hang on Ironlake GPU

2011-10-15 Thread Ben Widawsky
From: David Woodhouse 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 do