Messages in this thread | | | Date | Mon, 24 Jun 2019 15:16:32 -0300 | From | Jason Gunthorpe <> | Subject | Re: [RFC PATCH 00/28] Removing struct page from P2PDMA |
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On Mon, Jun 24, 2019 at 10:53:38AM -0600, Logan Gunthorpe wrote: > > It is only a very narrow case where you can take shortcuts with > > dma_addr_t, and I don't think shortcuts like are are appropriate for > > the mainline kernel.. > > I don't think it's that narrow and it opens up a lot of avenues for > system design that people are wanting to go. If your high speed data > path can avoid the root complex and CPU, you can design a system which a > much smaller CPU and fewer lanes directed at the CPU.
I mean the shortcut that something generates dma_addr_t for Device A and then passes it to Device B - that is too hacky for mainline.
Sounded like this series does generate the dma_addr for the correct device..
Jason
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