External DMA to gpu

[Dirk Eibach]

I have a grabber device on The PCIe-bus that is able to transfer image
data to other PCIe devices.
I want to setup a wayland client, that reserves a buffer in GPU
memory. Then the grabber could DMA to the buffer address. After
finishing the transfer, the client could flip the buffer.
Is there already a concept for this in weston? What might be a good
starting point?

Cheers
Dirk