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So what happens when you have dambufs that don't allow for CPU access.

This isn't supposed to happen. Worst case scenario, the DMA-BUF is copied internally in the GPU from hidden memory to visible memory, and then back to the CPU.

Being able to export a DMA-BUF is necessary anyway for multi-GPU setups.

EDIT: fixed a s/GPU/CPU/ typo

Copy data via DMA first?

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