[Bug 89360] [bdw-u iommu] DMAR error -> GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89360

--- Comment #20 from David Woodhouse <dwmw2 at infradead.org> ---
Looking at the first two dumps, this looks like it might be a simple driver
bug. The driver forgets to use the DMA API and wrongly just hands a physical
address to the device. The device does DMA to that invalid address, takes a
well-deserved fault, and is subsequently unhappy.

The faulting addresses do not look like addresses which would be given out as
virtual DMA addresses by the DMA API. Such addresses would typically start at
0xfffff000 and grow downwards.

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