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This removes the use of fake buffers from the driver, such that it could
probably be removed from the interface. It also should assist in proper
synchronization of access.
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Now, allocations only take locations, rather than a variety of unused flags.
The only interesting flag before was the no_move/no_evict pair for scanout
and similar buffers, which the DRI drivers don't use. That will be readded
when we get to using this code for display buffer allocation, by adding a
pin/unpin call (dynamic pinning/unpinning may be useful for VT switching and
root window resizing).
This commit changes one instance of DRM_BO_FLAG_MEM_LOCAL with
DRM_BO_FLAG_MEM_TT, which appeared to have been unintentional.
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The interface is not solid yet (some simplification to do still, and
adjustment for 0-copy), and the drivers are not converted. However, the new
interface allows using the same calls to support either a TTM or a classic
static allocation backend, with the static backend allowing a more limited
feature set.
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