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965 gains fixed TTM typing of the buffer object buffers and unused PBO
functions, and 915 gains buffer size == 0 fixes from 965.
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This adds (so far) unused PBO functions, and holding the lock while writing
to regions (which may be shared static screen regions).
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This is currently believed to work but be a significant performance loss.
Performance recovery should be soon to follow.
The dri_bo_fake_disable_backing_store() call was added to allow backing store
disable like bufmgr_fake.c did, which is a significant performance win (though
it's missing the no-fence-subdata part).
This commit is a squash merge of the 965-ttm branch, which had some history
I wanted to avoid pulling due to noisiness and brokenness at many points
for git-bisecting.
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This driver comes from Tungsten Graphics, with a few further modifications by
Intel.
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