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Re: Enabling peer to peer device transactions for PCIe devices

From Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Newsgroups linux.kernel
Subject Re: Enabling peer to peer device transactions for PCIe devices
Date 2016-11-23 20:20 +0100
Message-ID <sGLfj-uo-3@gated-at.bofh.it> (permalink)
References (1 earlier) <sGnPH-2mW-1@gated-at.bofh.it> <sGpya-3s5-39@gated-at.bofh.it> <sGJnb-7Id-21@gated-at.bofh.it> <sGKMh-5s-13@gated-at.bofh.it> <sGKMh-5s-11@gated-at.bofh.it>
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On Wed, Nov 23, 2016 at 10:40:47AM -0800, Dan Williams wrote:

> I don't think that was designed for the case where the backing memory
> is a special/static physical address range rather than anonymous
> "System RAM", right?

The hardware doesn't care where the memory is. ODP is just a generic
mechanism to provide demand-fault behavior for a mirrored page table.

ODP has the same issue as everything else, it needs to translate a
page table entry into a DMA address, and we have no API to do that
when the page table points to peer-peer memory.

Jason

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Thread

Enabling peer to peer device transactions for PCIe devices "Deucher, Alexander" <Alexander.Deucher@amd.com> - 2016-11-21 21:40 +0100
  Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-11-22 19:20 +0100
    Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-11-22 21:10 +0100
      Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-11-22 21:30 +0100
      Re: Enabling peer to peer device transactions for PCIe devices Daniel Vetter <daniel@ffwll.ch> - 2016-11-22 21:40 +0100
        Re: Enabling peer to peer device transactions for PCIe devices Daniel Vetter <daniel@ffwll.ch> - 2016-11-22 22:20 +0100
          Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-11-22 22:30 +0100
            Re: Enabling peer to peer device transactions for PCIe devices "Sagalovitch, Serguei" <Serguei.Sagalovitch@amd.com> - 2016-11-22 23:30 +0100
            Re: Enabling peer to peer device transactions for PCIe devices Daniel Vetter <daniel@ffwll.ch> - 2016-11-23 08:50 +0100
              Re: Enabling peer to peer device transactions for PCIe devices Dave Hansen <dave.hansen@linux.intel.com> - 2016-11-23 18:10 +0100
    Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-11-23 18:20 +0100
      Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-11-23 19:50 +0100
        Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-23 20:20 +0100
      Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-23 20:10 +0100
        Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-23 20:40 +0100
          Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-23 21:40 +0100
            Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-11-23 22:20 +0100
              Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-23 23:40 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Dan Williams <dan.j.williams@intel.com> - 2016-11-23 23:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-24 00:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-24 17:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-11-24 19:00 +0100
                Re: Enabling peer to peer device transactions for PCIe devices "Sagalovitch, Serguei" <Serguei.Sagalovitch@amd.com> - 2016-11-24 01:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-24 17:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-11-24 02:30 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-11-24 17:50 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Logan Gunthorpe <logang@deltatee.com> - 2016-11-24 19:20 +0100
                Re: Enabling peer to peer device transactions for PCIe devices Christoph Hellwig <hch@infradead.org> - 2016-11-25 09:30 +0100

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