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

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Date:	Thu, 26 Jun 2014 15:14:45 +0100
From:	Will Deacon <will.deacon@....com>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Liviu Dudau <Liviu.Dudau@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Arnd Bergmann <arnd@...db.de>,
	linux-pci <linux-pci@...r.kernel.org>,
	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 03:11:38PM +0100, Catalin Marinas wrote:
> 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).

I feel it's also worth pointing out that I didn't write that code with the
intention of getting it merged, nor as a competing solution to what Liviu
was proposing at the time. It was merely a development tool to enable some
of the SMMU and GICv3 work that Marc and I have been working on recently.

Will
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