linux-kernel - Re: [PATCH v8 3/9] pci: Introduce pci_register_io

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Message-ID: <20140709085910.GP6501@e106497-lin.cambridge.arm.com>
Date:	Wed, 9 Jul 2014 09:59:11 +0100
From:	Liviu Dudau <Liviu.Dudau@....com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-pci <linux-pci@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	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>,
	LKML <linux-kernel@...r.kernel.org>,
	Device Tree ML <devicetree@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v8 3/9] pci: Introduce pci_register_io_range() helper
 function.

On Tue, Jul 08, 2014 at 03:14:17PM +0100, Arnd Bergmann wrote:
> On Tuesday 08 July 2014, Liviu Dudau wrote:
> > > Here's what these look like in /proc/iomem and /proc/ioports (note that
> > > there are two resource structs for each memory-mapped IO port space: one
> > > IORESOURCE_MEM for the memory-mapped area (used only by the host bridge
> > > driver), and one IORESOURCE_IO for the I/O port space (this becomes the
> > > parent of a region used by a regular device driver):
> > > 
> > >   /proc/iomem:
> > >     PCI Bus 0000:00 I/O Ports 00000000-00000fff
> > >     PCI Bus 0001:00 I/O Ports 01000000-01000fff
> > > 
> > >   /proc/ioports:
> > >     00000000-00000fff : PCI Bus 0000:00
> > >     01000000-01000fff : PCI Bus 0001:00
> > 
> > OK, I have a question that might be ovbious to you but I have missed the answer
> > so far: how does the IORESOURCE_MEM area gets created? Is it the host bridge
> > driver's job to do it? Is it something that the framework should do when it
> > notices that the IORESOURCE_IO is memory mapped?
> 
> The host bridge driver should either register the IORESOURCE_MEM resource
> itself from its probe or setup function, or it should get registered behind
> the covers in drivers using of_create_pci_host_bridge().
> 
> Your new pci_host_bridge_of_get_ranges already loops over all the 
> resources, so it would be a good place to put that.

OK, so it is not something that I've missed, just something that x86-64 does and
my version doesn't yet.

Thanks for confirming that.

Liviu

> 
> 	Arnd
> 

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
  ---------------
    ¯\_(ツ)_/¯

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