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From: matthew.gerlach@linux.intel.com
To: Moritz Fischer <moritz.fischer@ettus.com>
Cc: "Alan Tull" <delicious.quinoa@gmail.com>,
	"Nadathur, Sundar" <sundar.nadathur@intel.com>,
	"Yves Vandervennet" <yves.vandervennet@linux.intel.com>,
	"Jason Gunthorpe" <jgunthorpe@obsidianresearch.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	"linux-fpga@vger.kernel.org" <linux-fpga@vger.kernel.org>,
	"Marek Vašut" <marex@denx.de>
Subject: Re: [RFC 7/8] fpga-region: add sysfs interface
Date: Mon, 27 Feb 2017 16:04:59 -0800 (PST)	[thread overview]
Message-ID: <alpine.DEB.2.20.1702271559340.23635@mgerlach-VirtualBox> (raw)
In-Reply-To: <CAAtXAHcc+kbGCHsixP2GhbrUKEE3XJZmS8QnYnteJNp2-zspxg@mail.gmail.com>



On Mon, 27 Feb 2017, Moritz Fischer wrote:

> 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 think there is merit it considering the platform bus as part of the 
overal enumeration strategy.  When using device trees, the platform bus is 
involved.  I have also seen other folks enumerate over a platform bus 
based on data in a format other than device tree.  I have experimented 
with instantiating platform devices from my pcie driver, but I didn't 
completely work, which could be related to using a fairly old 3.10 kernel.

Matthew Gerlach

>
> I really need to take another look at how non-dt systems enumerate to
> give better feedback on this.
>
> Cheers,
>
> Moritz
> --
> To unsubscribe from this list: send the line "unsubscribe linux-fpga" in
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>

  reply	other threads:[~2017-02-28  6:28 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-15 16:14 FPGA Region enhancements and fixes Alan Tull
2017-02-15 16:14 ` [RFC 1/8] fpga-mgr: add a single function for fpga loading methods Alan Tull
2017-02-16  0:36   ` matthew.gerlach
2017-02-15 16:14 ` [RFC 2/8] fpga-region: support more than one overlay per FPGA region Alan Tull
2017-02-16 16:50   ` matthew.gerlach
2017-02-16 17:35     ` Alan Tull
2017-02-15 16:14 ` [RFC 3/8] fpga-bridge: add non-dt support Alan Tull
2017-02-15 16:14 ` [RFC 4/8] doc: fpga-mgr: separate getting/locking FPGA manager Alan Tull
2017-02-17 17:14   ` Li, Yi
2017-02-17 21:55     ` Alan Tull
2017-02-17 17:52   ` Moritz Fischer
2017-02-17 22:02     ` Alan Tull
2017-02-15 16:14 ` [RFC 5/8] " Alan Tull
2017-02-15 16:14 ` [RFC 6/8] fpga-region: separate out common code to allow non-dt support Alan Tull
2017-02-15 16:14 ` [RFC 7/8] fpga-region: add sysfs interface Alan Tull
2017-02-15 17:21   ` Jason Gunthorpe
2017-02-15 17:46     ` Alan Tull
2017-02-15 17:55       ` Moritz Fischer
2017-02-15 18:06       ` Jason Gunthorpe
2017-02-15 18:23         ` Alan Tull
2017-02-15 18:31           ` Moritz Fischer
2017-02-15 19:49           ` Jason Gunthorpe
2017-02-15 22:49             ` Alan Tull
2017-02-15 23:07               ` Jason Gunthorpe
2017-02-15 20:07           ` matthew.gerlach
2017-02-15 20:37             ` Jason Gunthorpe
2017-02-15 20:54               ` Moritz Fischer
2017-02-15 21:15                 ` Jason Gunthorpe
2017-02-15 21:36                   ` Moritz Fischer
2017-02-15 22:42                     ` Alan Tull
2017-02-16  0:16                       ` Moritz Fischer
2017-02-16 17:47                         ` Alan Tull
2017-02-16 17:56                           ` Jason Gunthorpe
2017-02-16 18:11                             ` Moritz Fischer
2017-02-17 22:28                 ` Yves Vandervennet
2017-02-18  2:30                   ` Moritz Fischer
2017-02-18 12:45                     ` Nadathur, Sundar
2017-02-18 20:10                       ` Alan Tull
2017-02-18 20:45                         ` Moritz Fischer
2017-02-19 15:00                           ` Alan Tull
2017-02-19 23:16                             ` Alan Tull
2017-02-20 23:49                               ` Moritz Fischer
2017-02-21 18:33                                 ` Alan Tull
2017-02-22  3:13                                   ` Nadathur, Sundar
2017-02-22  3:49                                     ` Moritz Fischer
2017-02-22  5:12                                       ` Jason Gunthorpe
2017-02-22  5:38                                         ` Moritz Fischer
2017-02-22  5:46                                           ` Nadathur, Sundar
2017-02-22  6:05                                             ` Moritz Fischer
2017-02-22 16:44                                               ` Jason Gunthorpe
2017-02-22 17:50                                                 ` Moritz Fischer
2017-02-22 17:54                                                   ` Jason Gunthorpe
2017-02-22 17:57                                                     ` Moritz Fischer
2017-02-22 16:33                                           ` Alan Tull
2017-02-22 16:44                                             ` Moritz Fischer
2017-02-22 16:52                                               ` Alan Tull
2017-02-27 20:09                                   ` Alan Tull
2017-02-27 22:49                                     ` Moritz Fischer
2017-02-28  0:04                                       ` matthew.gerlach [this message]
2017-02-15 21:20         ` Anatolij Gustschin
2017-02-15 16:14 ` [RFC 8/8] doc: fpga: add sysfs document for fpga region Alan Tull
2017-02-28 17:35 ` FPGA Region enhancements and fixes Alan Tull
2017-02-28 22:03   ` Alan Tull

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