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A recent commit removed a bug which essentially caused a sync after each
use of a user buffer. In fixing it, the scratch area can now become
fragmented under some circumstances leading to nouveau_bo_tmp() waiting
forever for a large enough block of free space.
This fixes ppracer, gl-117 and probably a heap of other apps.
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It's possible for the unsignalled list head to change during fence_flush.
Fixes valgrind complaint exposed by a previous commit.
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Rather than spinning waiting for the GPU to finish with the buffer,
add a callback on the buffer's fence object instead. Gives a sizable
performance increase in OA.
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Fixes some cases where we end up with a list of many unused chunks that are
too small to be useful.
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Untested on NV3x/NV5x. Quite possibly broken.
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That was... fun..
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