[Intel-gfx] [PATCH 3/3] drm/i915/selftests: Exercise adding requests to a full GGTT

[Chris Wilson]

Quoting Chris Wilson (2017-10-11 15:06:07)
> A bug recently encountered involved the issue where are we were
> submitting requests to different ppGTT, each would pin a segment of the
> GGTT for its logical context and ring. However, this is invisible to
> eviction as we do not tie the context/ring VMA to a request and so do
> not automatically wait upon it them (instead they are marked as pinned,
> prevent eviction entirely). Instead the eviction code must flush those
  ^preventing.
-Chris