Hi,

> +      * TODO: Synchronize with other users of the buffer. Buffers
> +      *       cannot be pinned to VRAM while they are in use by other
> +      *       drivers for DMA. We should probably wait for each GEM
> +      *       object's fence before attempting to pin the buffer.

The other option is p2p (Documentation/driver-api/pci/p2pdma.rst).

cheers,
  Gerd

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