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virgl: do not use inline writes for subdata

Chia-I Wu requested to merge olv/mesa:virgl-no-inline-writes into master

Inline writes skip transfer map/unamp at the cost of an extra copy on the data during execbuffer. That is generally a win for small transfers. But the heuristic to use inline writes based on buffer sizes rather than transfer sizes makes little sense. More importantly, inline writes miss optimizations that are done for buffer transfers.

Let's just use transfers.

Signed-off-by: Chia-I Wu olvaffe@gmail.com

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