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Putting the bufmgr in the screen is not thread-safe since the emit_reloc
changes. It also led to a significant performance hit from pthread usage
for the attempted thread-safety (up to 12% of a cpu spent on refcounting
protection in single-threaded 965). The motivation had been to allow
multi-context bufmgr sharing in classic mode, but it wasn't worth the cost.
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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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The pool that the static buffer got allocated from was sized by pitch * height,
but the buffer generated from it had its size aligned to a tile boundary, so
allocation failed if pitch * height wasn't aligned. However, the 2d driver
ensures that the size ends at a tile boundary, so just pass the 2d driver's
buffer size rather than calculating it.
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rendering operations to take place after evicting all resident
buffers.
Cope better with memory allocation failures throughout the driver and
improve tracking of failures.
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This driver comes from Tungsten Graphics, with a few further modifications by
Intel.
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