On Tue, Apr 18, 2017 at 12:35 PM, Logan Gunthorpe <logang@xxxxxxxxxxxx> wrote: > > > On 18/04/17 01:01 PM, Jason Gunthorpe wrote: >> Ultimately every dma_ops will need special code to support P2P with >> the special hardware that ops is controlling, so it makes some sense >> to start by pushing the check down there in the first place. This >> advice is partially motivated by how dma_map_sg is just a small >> wrapper around the function pointer call... > > Yes, I noticed this problem too and that makes sense. It just means > every dma_ops will probably need to be modified to either support p2p > pages or fail on them. Though, the only real difficulty there is that it > will be a lot of work. I don't think you need to go touch all dma_ops, I think you can just arrange for devices that are going to do dma to get redirected to a p2p aware provider of operations that overrides the system default dma_ops. I.e. just touch get_dma_ops(). -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
