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Re: [RFC 7/8] fpga-region: add sysfs interface

From Moritz Fischer <moritz.fischer@ettus.com>
Newsgroups linux.kernel
Subject Re: [RFC 7/8] fpga-region: add sysfs interface
Date 2017-02-28 00:00 +0100
Message-ID <tfCqR-3Po-5@gated-at.bofh.it> (permalink)
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Alan,

On Mon, Feb 27, 2017 at 12:09 PM, Alan Tull <delicious.quinoa@gmail.com> wrote:


> First case: embedded FPGA.  The hardware has one FPGA.  The image is
> designed for a specific board, so there's no problem including the
> enumeration in the image.

Agreed.

> Second case: embedded FPGA + a PCIe FPGA.  The image will be specific
> as to whether it goes into the embedded FPGA or the PCIe one.

Agreed.


> Third case: multiple PCIe FPGAs.  The enumeration base will be the
> PCIe bus of the individual FPGA.  If the FPGAs don't have unique pin
> connections, then the images could go on any of the PCie FPGAs.  If
> there are unique pin connections, then the image will be specific to
> the FPGA and having the enumeration data in the image is that much
> more helpful for keeping things straight.  Part of the header could
> specify which specific FPGA it should go on if it is restricted.

Agreed.

> Of course if the FPGAs have > 1 PR regions, most FPGA architectures do
> not have relocatable images so those images will be specific for the
> PR region but not specific to the FPGA except as otherwise noted
> above.
>
> So again, including enumeration data in the bitstream should work
> unless I'm missing something.  What am I missing here?

If you enumeration base is sufficiently smart, I suppose that can work.
What you'd probably want is some sort of extension to the platform bus?

I really need to take another look at how non-dt systems enumerate to
give better feedback on this.

Cheers,

Moritz

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Thread

[RFC 7/8] fpga-region: add sysfs interface Alan Tull <atull@kernel.org> - 2017-02-15 17:20 +0100
  Re: [RFC 7/8] fpga-region: add sysfs interface Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-15 18:30 +0100
    Re: [RFC 7/8] fpga-region: add sysfs interface Alan Tull <delicious.quinoa@gmail.com> - 2017-02-15 18:50 +0100
      Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-15 19:00 +0100
      Re: [RFC 7/8] fpga-region: add sysfs interface Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-15 19:10 +0100
        Re: [RFC 7/8] fpga-region: add sysfs interface Alan Tull <delicious.quinoa@gmail.com> - 2017-02-15 19:30 +0100
          Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-15 19:40 +0100
          Re: [RFC 7/8] fpga-region: add sysfs interface Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-15 20:50 +0100
            Re: [RFC 7/8] fpga-region: add sysfs interface Alan Tull <delicious.quinoa@gmail.com> - 2017-02-16 00:00 +0100
              Re: [RFC 7/8] fpga-region: add sysfs interface Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-16 00:10 +0100
          Re: [RFC 7/8] fpga-region: add sysfs interface matthew.gerlach@linux.intel.com - 2017-02-15 21:10 +0100
            Re: [RFC 7/8] fpga-region: add sysfs interface Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-15 21:40 +0100
              Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-15 22:00 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-15 22:20 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-15 22:40 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Alan Tull <delicious.quinoa@gmail.com> - 2017-02-15 23:50 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-16 01:20 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Alan Tull <delicious.quinoa@gmail.com> - 2017-02-16 18:50 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-16 19:00 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-16 19:20 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Yves Vandervennet <yves.vandervennet@linux.intel.com> - 2017-02-17 23:30 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-18 03:40 +0100
                RE: [RFC 7/8] fpga-region: add sysfs interface "Nadathur, Sundar" <sundar.nadathur@intel.com> - 2017-02-18 13:50 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Alan Tull <delicious.quinoa@gmail.com> - 2017-02-18 21:20 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-18 22:00 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Alan Tull <delicious.quinoa@gmail.com> - 2017-02-19 16:10 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Alan Tull <delicious.quinoa@gmail.com> - 2017-02-20 00:20 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-21 01:00 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Alan Tull <delicious.quinoa@gmail.com> - 2017-02-21 19:40 +0100
                RE: [RFC 7/8] fpga-region: add sysfs interface "Nadathur, Sundar" <sundar.nadathur@intel.com> - 2017-02-22 04:20 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-22 04:50 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-22 06:20 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-22 06:40 +0100
                RE: [RFC 7/8] fpga-region: add sysfs interface "Nadathur, Sundar" <sundar.nadathur@intel.com> - 2017-02-22 06:50 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-22 07:10 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-22 17:50 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-22 19:00 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-22 19:00 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-22 19:00 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Alan Tull <delicious.quinoa@gmail.com> - 2017-02-22 17:40 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-22 17:50 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Alan Tull <delicious.quinoa@gmail.com> - 2017-02-22 18:00 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Moritz Fischer <moritz.fischer@ettus.com> - 2017-02-28 00:00 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface matthew.gerlach@linux.intel.com - 2017-02-28 07:30 +0100
                Re: [RFC 7/8] fpga-region: add sysfs interface Alan Tull <delicious.quinoa@gmail.com> - 2017-02-28 13:40 +0100
        Re: [RFC 7/8] fpga-region: add sysfs interface Anatolij Gustschin <agust@denx.de> - 2017-02-15 22:30 +0100

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