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Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory

From Logan Gunthorpe <logang@deltatee.com>
Newsgroups linux.kernel
Subject Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory
Date 2017-04-14 06:50 +0200
Message-ID <tw1lf-528-5@gated-at.bofh.it> (permalink)
References (2 earlier) <tvu5X-7gS-3@gated-at.bofh.it> <tvysV-1QL-3@gated-at.bofh.it> <tvUts-jx-17@gated-at.bofh.it> <tvWlz-1Bt-7@gated-at.bofh.it> <tw0Se-4NC-9@gated-at.bofh.it>
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On 13/04/17 10:16 PM, Jason Gunthorpe wrote:
> I'd suggest just detecting if there is any translation in bus
> addresses anywhere and just hard disabling P2P on such systems.

That's a fantastic suggestion. It simplifies things significantly.
Unless there are any significant objections I think I will plan on doing
that.

> On modern hardware with 64 bit BARs there is very little reason to
> have translation, so I think this is a legacy feature.

Yes, p2pmem users are likely to be designing systems around it (ie
JBOFs) and not trying to shoehorn it onto legacy architectures.

At the very least, it makes sense to leave it out and if someone comes
along who cares they can put in the effort to support the address
translation.

Thanks,

Logan

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Thread

Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2017-04-12 08:30 +0200
  Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Logan Gunthorpe <logang@deltatee.com> - 2017-04-12 19:20 +0200
    Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2017-04-13 00:00 +0200
      Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Logan Gunthorpe <logang@deltatee.com> - 2017-04-13 23:30 +0200
        Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2017-04-14 00:40 +0200
        Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Bjorn Helgaas <helgaas@kernel.org> - 2017-04-14 01:30 +0200
          Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-04-14 06:20 +0200
            Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Logan Gunthorpe <logang@deltatee.com> - 2017-04-14 06:50 +0200
              Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Benjamin Herrenschmidt <benh@au1.ibm.com> - 2017-04-14 13:50 +0200
              Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2017-04-14 15:00 +0200
            Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2017-04-14 13:40 +0200
              Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Logan Gunthorpe <logang@deltatee.com> - 2017-04-14 19:40 +0200
                Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Bjorn Helgaas <helgaas@kernel.org> - 2017-04-14 21:10 +0200
                Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2017-04-15 00:10 +0200
                Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Logan Gunthorpe <logang@deltatee.com> - 2017-04-15 19:50 +0200
                Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Dan Williams <dan.j.williams@intel.com> - 2017-04-16 00:10 +0200
                Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2017-04-16 05:10 +0200
                Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Logan Gunthorpe <logang@deltatee.com> - 2017-04-16 06:50 +0200
                Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Dan Williams <dan.j.williams@intel.com> - 2017-04-16 18:00 +0200
                Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Logan Gunthorpe <logang@deltatee.com> - 2017-04-16 18:40 +0200
                Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2017-04-17 01:00 +0200
                Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Knut Omang <knut.omang@oracle.com> - 2017-04-24 09:40 +0200
                Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Logan Gunthorpe <logang@deltatee.com> - 2017-04-24 18:20 +0200
                Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2017-04-17 00:30 +0200
                Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2017-04-16 00:20 +0200
                Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Logan Gunthorpe <logang@deltatee.com> - 2017-04-16 07:40 +0200

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