Re: [RFC 1/8] Introduce Peer-to-Peer memory (p2pmem) device

From	Logan Gunthorpe <logang@deltatee.com>
Newsgroups	linux.kernel
Subject	Re: [RFC 1/8] Introduce Peer-to-Peer memory (p2pmem) device
Date	2017-04-02 00:20 +0200
Message-ID	<trzxf-c5-1@gated-at.bofh.it> (permalink)
References	(4 earlier) <trcr0-1C9-17@gated-at.bofh.it> <trdwK-2gW-3@gated-at.bofh.it> <treCt-2V3-9@gated-at.bofh.it> <trguB-4hQ-1@gated-at.bofh.it> <trgNY-4N2-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hey,

On 31/03/17 08:17 PM, okaya@codeaurora.org wrote:
> See drivers/pci and drivers/acpi directory.

The best I could find was the date of the firmware/bios. I really don't
think that makes sense to tie the two together. And really the more that
I think about it trying to do a date cutoff for this seems crazy without
very comprehensive hardware testing done. I have no idea which AMD chips
have decent root ports for this and then if we include all of ARM and
POWERPC, etc there's a huge amount of unknown hardware. Saying that the
system's firmware has to be written after 2016 seems like an arbitrary
restriction that isn't likely to correlate to any working systems.

I still say the only sane thing to do is allow all switches and then add
a whitelist of root ports that are known to work well. If we care about
preventing broken systems in a comprehensive way then that's the only
thing that is going to work.

Logan

Thread

[RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory Logan Gunthorpe <logang@deltatee.com> - 2017-03-31 00:20 +0200
  [RFC 1/8] Introduce Peer-to-Peer memory (p2pmem) device Logan Gunthorpe <logang@deltatee.com> - 2017-03-31 00:20 +0200
    Re: [RFC 1/8] Introduce Peer-to-Peer memory (p2pmem) device Sinan Kaya <okaya@codeaurora.org> - 2017-03-31 20:50 +0200
      Re: [RFC 1/8] Introduce Peer-to-Peer memory (p2pmem) device Logan Gunthorpe <logang@deltatee.com> - 2017-03-31 23:30 +0200
        Re: [RFC 1/8] Introduce Peer-to-Peer memory (p2pmem) device Sinan Kaya <okaya@codeaurora.org> - 2017-03-31 23:40 +0200
          Re: [RFC 1/8] Introduce Peer-to-Peer memory (p2pmem) device Logan Gunthorpe <logang@deltatee.com> - 2017-04-01 00:50 +0200
            Re: [RFC 1/8] Introduce Peer-to-Peer memory (p2pmem) device Sinan Kaya <okaya@codeaurora.org> - 2017-04-01 02:00 +0200
              Re: [RFC 1/8] Introduce Peer-to-Peer memory (p2pmem) device Logan Gunthorpe <logang@deltatee.com> - 2017-04-01 04:00 +0200
                Re: [RFC 1/8] Introduce Peer-to-Peer memory (p2pmem) device okaya@codeaurora.org - 2017-04-01 04:20 +0200
                Re: [RFC 1/8] Introduce Peer-to-Peer memory (p2pmem) device Logan Gunthorpe <logang@deltatee.com> - 2017-04-02 00:20 +0200
                Re: [RFC 1/8] Introduce Peer-to-Peer memory (p2pmem) device Sinan Kaya <okaya@codeaurora.org> - 2017-04-02 04:30 +0200
                Re: [RFC 1/8] Introduce Peer-to-Peer memory (p2pmem) device Logan Gunthorpe <logang@deltatee.com> - 2017-04-02 19:30 +0200
                Re: [RFC 1/8] Introduce Peer-to-Peer memory (p2pmem) device Sinan Kaya <okaya@codeaurora.org> - 2017-04-02 23:10 +0200
                Re: [RFC 1/8] Introduce Peer-to-Peer memory (p2pmem) device Logan Gunthorpe <logang@deltatee.com> - 2017-04-03 06:30 +0200
  [RFC 4/8] p2pmem: Add debugfs "stats" file Logan Gunthorpe <logang@deltatee.com> - 2017-03-31 00:20 +0200
    Re: [RFC 4/8] p2pmem: Add debugfs "stats" file Sagi Grimberg <sagi@grimberg.me> - 2017-04-04 12:50 +0200
      Re: [RFC 4/8] p2pmem: Add debugfs "stats" file Logan Gunthorpe <logang@deltatee.com> - 2017-04-04 19:30 +0200
      RE: [RFC 4/8] p2pmem: Add debugfs "stats" file "Steve Wise" <swise@opengridcomputing.com> - 2017-04-05 18:20 +0200
  [RFC 2/8] cxgb4: setup pcie memory window 4 and create p2pmem region Logan Gunthorpe <logang@deltatee.com> - 2017-03-31 00:20 +0200
    Re: [RFC 2/8] cxgb4: setup pcie memory window 4 and create p2pmem  region Sagi Grimberg <sagi@grimberg.me> - 2017-04-04 12:50 +0200
      Re: [RFC 2/8] cxgb4: setup pcie memory window 4 and create p2pmem  region Logan Gunthorpe <logang@deltatee.com> - 2017-04-04 18:00 +0200
      RE: [RFC 2/8] cxgb4: setup pcie memory window 4 and create p2pmem region "Steve Wise" <swise@opengridcomputing.com> - 2017-04-05 18:20 +0200
  [RFC 5/8] scatterlist: Modify SG copy functions to support io memory. Logan Gunthorpe <logang@deltatee.com> - 2017-03-31 00:20 +0200
    Re: [RFC 5/8] scatterlist: Modify SG copy functions to support io  memory. Christoph Hellwig <hch@infradead.org> - 2017-03-31 09:20 +0200
      Re: [RFC 5/8] scatterlist: Modify SG copy functions to support io  memory. Logan Gunthorpe <logang@deltatee.com> - 2017-03-31 17:50 +0200
        Re: [RFC 5/8] scatterlist: Modify SG copy functions to support io  memory. Logan Gunthorpe <logang@deltatee.com> - 2017-04-03 23:30 +0200
          Re: [RFC 5/8] scatterlist: Modify SG copy functions to support io memory. Dan Williams <dan.j.williams@intel.com> - 2017-04-03 23:50 +0200
            Re: [RFC 5/8] scatterlist: Modify SG copy functions to support io  memory. Logan Gunthorpe <logang@deltatee.com> - 2017-04-04 00:20 +0200
              Re: [RFC 5/8] scatterlist: Modify SG copy functions to support io memory. Dan Williams <dan.j.williams@intel.com> - 2017-04-04 00:50 +0200
                Re: [RFC 5/8] scatterlist: Modify SG copy functions to support io  memory. Logan Gunthorpe <logang@deltatee.com> - 2017-04-04 01:20 +0200
                Re: [RFC 5/8] scatterlist: Modify SG copy functions to support io memory. Dan Williams <dan.j.williams@intel.com> - 2017-04-04 02:10 +0200
                Re: [RFC 5/8] scatterlist: Modify SG copy functions to support io  memory. Logan Gunthorpe <logang@deltatee.com> - 2017-04-07 20:00 +0200
  [RFC 8/8] p2pmem: Added char device user interface Logan Gunthorpe <logang@deltatee.com> - 2017-03-31 00:20 +0200
  [RFC 7/8] p2pmem: Support device removal Logan Gunthorpe <logang@deltatee.com> - 2017-03-31 00:20 +0200

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