7 Sep
2022
7 Sep
'22
12:03 p.m.
On Tue, Sep 06, 2022 at 12:38:44PM +0200, Christian König wrote:
The problem is once more that this is MMIO space, in other words register BARs which needs to be exported/imported.
Everything used for P2P is bar space.
Adding struct pages for it generally sounds like the wrong approach here. You can't even access this with the CPU or would trigger potentially unwanted hardware actions.
How would an access from the CPU vs anther device make any difference?
Would you mind if I start to tackle this problem?
Yes, I've been waiting forever for someone to tacke how the scatterlist is abused in dma-buf..