[Intel-gfx] Fencing on the i915

[Chris Wilson]

Hello all,
I've spent a bit of time trying to improve the behaviour of my i915 when
using tiled buffers and fencing. I believe I've found a few critical
issues in the code, but alas I can still cause the chip to hang if I
write to the fence registers too frequently.

I've attempted to break down my patches into logically separate series -
debugging, error handling fixes, some miscellaneous and finally changes
to i915_gem_object_get_fence_reg(). The first set are attached, the
latter I will attach in reply as I finish tidying them up.

Thanks.
-ickle
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