Re: dynamic DMA-buf sharing between devices

From: Christian KÃnig
Date: Wed Apr 17 2019 - 09:59:57 EST

On top of those I have 6 more patches in the pipeline to enable VRAM P2P with DMA-buf.

So that is not the end of the patch set :)


Am 17.04.19 um 15:52 schrieb Chunming Zhou:
Thanks Christian, great job. I will verify it this week when I finish my
current work on hand.


å 2019/4/17 2:38, Christian KÃnig wrote:
Hi everybody,

core idea in this patch set is that DMA-buf importers can now provide an optional invalidate callback. Using this callback and the reservation object exporters can now avoid pinning DMA-buf memory for a long time while sharing it between devices.

I've already send out an older version roughly a year ago, but didn't had time to further look into cleaning this up.

The last time a major problem was that we would had to fix up all drivers implementing DMA-buf at once.

Now I avoid this by allowing mappings to be cached in the DMA-buf attachment and so driver can optionally move over to the new interface one by one.

This is also a prerequisite to my patchset enabling sharing of device memory with DMA-buf.

Please review and/or comment,

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