linux-kernel - Re: [PATCH v7 1/6] pci: Introduce pci_register_io

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Message-ID: <20140626141138.GC15296@arm.com>
Date:	Thu, 26 Jun 2014 15:11:38 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Liviu Dudau <Liviu.Dudau@....com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>,
	linux-pci <linux-pci@...r.kernel.org>,
	Will Deacon <Will.Deacon@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	Tanmay Inamdar <tinamdar@....com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Jon Masters <jonathan@...masters.org>
Subject: Re: [PATCH v7 1/6] pci: Introduce pci_register_io_range() helper
 function.

On Thu, Jun 26, 2014 at 10:30:29AM +0100, Liviu Dudau wrote:
> On Thu, Jun 26, 2014 at 09:59:26AM +0100, Catalin Marinas wrote:
> > Although a bit late, I'm raising this now and hopefully we'll come to a
> > conclusion soon. Delaying arm64 PCIe support even further is not a real
> > option, which leaves us with:
> > 
> > 1. Someone else (with enough PCIe knowledge) volunteering to take over
> >    soon or
> > 2. Dropping Liviu's work and going for an arm64-specific implementation
> >    (most likely based on the arm32 implementation, see below)
[...]
> > In conclusion, unless someone volunteers for the first option fairly
> > soon, we'll post the alternative patches for review and take it from
> > there.
> 
> That would be a huge step backwards IMO and a huge dissapointment. If
> you go with the alternative patches from Will you will basically reset
> every partner's implementation that has been built on top of my
> patches (when they did so with the understanding that my series will be
> the one ARM will support and publish) *and* make anyone's attempt to
> create a generic implementation harder, as they will have to undo this
> code to remove the arch-specific parts.

I fully agree and the alternative patchset is definitely _not_ my
preferred solution. You can read this email as a request for help to
complete the work (whether it comes from ARM, Linaro or other interested
parties). I don't mean taking over the whole patchset but potentially
helping with other arch conversion (microblaze, arm multi-platform).

(however, if the generic PCIe work won't happen in reasonable time, we
need to set some deadline rather than keeping the patchset out of tree
indefinitely)

-- 
Catalin
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