linux-kernel - Re: Support for configurable PCIe endpoint

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Date:	Wed, 03 Aug 2016 21:38:23 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Kishon Vijay Abraham I <kishon@...com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Jingoo Han <jingoohan1@...il.com>,
	Pratyush Anand <pratyush.anand@...il.com>,
	Ley Foon Tan <lftan@...era.com>,
	Rob Herring <robh@...nel.org>,
	Tanmay Inamdar <tinamdar@....com>,
	Roy Zang <tie-fei.zang@...escale.com>,
	Mingkai Hu <mingkai.hu@...escale.com>,
	Minghuan Lian <minghuan.Lian@...escale.com>,
	Richard Zhu <Richard.Zhu@...escale.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Murali Karicheri <m-karicheri2@...com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>,
	Thierry Reding <thierry.reding@...il.com>,
	Simon Horman <horms@...ge.net.au>,
	Joao Pinto <jpinto@...opsys.com>,
	Zhou Wang <wangzhou1@...ilicon.com>,
	Gabriele Paoloni <gabriele.paoloni@...wei.com>,
	Stanimir Varbanov <svarbanov@...sol.com>,
	David Daney <david.daney@...ium.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	jdmason@...zu.us
Subject: Re: Support for configurable PCIe endpoint

On Wednesday, August 3, 2016 10:27:36 AM CEST Christoph Hellwig wrote:
> On Wed, Aug 03, 2016 at 06:03:54PM +0200, Arnd Bergmann wrote:
> > drivers/ntb seems like a reasonable start, while an alternative
> > approach that we have discussed in the past would be based on top
> > of virtio, so we could use the existing front-end drivers (net, block,
> > v9fs, console, ...).
> 
> I don't really think either is a good aproach for the lowest level
> interface.  To be useful the EP driver needs to be able to implement
> any (reasonable) thing a PCIe device could do.  Both NTB and virtio
> can sit on top of that, though.

Good point. NTB tries to be the low-level interface, but I guess
you are right that it really isn't (I have not looked in a long
time, maybe Jon can comment).

While virtio transport over PCI would be great as the way to
implement a lot of things on top of endpoint devices, it can't
be the lowest level in the stack (see drivers/remoteproc) and
building it on top of something that is useful for other things
sounds like a good idea.

	Arnd