linux-kernel - Re: [PATCH v9 12/12] PCI: Introduce pci_remap_iospace() for remapping PCI I/O bus resources into CPU space

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Message-ID: <20140813105358.GD18495@arm.com>
Date:	Wed, 13 Aug 2014 11:53:58 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Liviu Dudau <Liviu.Dudau@....com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Will Deacon <Will.Deacon@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Arnd Bergmann <arnd@...db.de>,
	Russell King <linux@....linux.org.uk>,
	Tanmay Inamdar <tinamdar@....com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Sinan Kaya <okaya@...eaurora.org>,
	Jingoo Han <jg1.han@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Suravee Suthikulanit <suravee.suthikulpanit@....com>,
	linux-pci <linux-pci@...r.kernel.org>,
	linux-arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Device Tree ML <devicetree@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v9 12/12] PCI: Introduce pci_remap_iospace() for
 remapping PCI I/O bus resources into CPU space

On Wed, Aug 13, 2014 at 11:33:11AM +0100, Liviu Dudau wrote:
> On Wed, Aug 13, 2014 at 11:01:18AM +0100, Catalin Marinas wrote:
> > On Tue, Aug 12, 2014 at 05:25:25PM +0100, Liviu Dudau wrote:
> > > Introduce a default implementation for remapping PCI bus I/O resources
> > > onto the CPU address space. Architectures with special needs may
> > > provide their own version, but most should be able to use this one.
> > > 
> > > Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> > > Cc: Arnd Bergmann <arnd@...db.de>
> > > Cc: Rob Herring <robh+dt@...nel.org>
> > > Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
> > 
> > I guess you could have added the generic pgprot_device definition to
> > this patch and the arm64 specific one in the separate arm64 PCIe support
> > (and one less patch in total). But not a big issue either way.
> 
> I went by the established history on that file, where a new interface gets
> introduced together with its use. I guess it makes backing out the change
> much easier?

The point is that the only user of pgprot_device is pci_remap_iospace()
currently, so it makes sense to introduce the generic definition
together with this patch.

-- 
Catalin
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