linux-kernel - Re: [PATCH v13 00/12] Support for creating generic PCI host bridges from DT

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Message-ID: <20140930165431.GV841@e106497-lin.cambridge.arm.com>
Date:	Tue, 30 Sep 2014 17:54:31 +0100
From:	Liviu Dudau <Liviu.Dudau@....com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Arnd Bergmann <arnd@...db.de>, Rob Herring <robh+dt@...nel.org>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Russell King <linux@....linux.org.uk>,
	linux-pci <linux-pci@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.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>,
	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>,
	Yinghai Lu <yinghai@...nel.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>
Subject: Re: [PATCH v13 00/12] Support for creating generic PCI host bridges
 from DT

On Tue, Sep 30, 2014 at 05:18:05PM +0100, Bjorn Helgaas wrote:
> On Tue, Sep 30, 2014 at 11:39:42AM +0100, Liviu Dudau wrote:
> > On Mon, Sep 29, 2014 at 08:43:35PM +0100, Bjorn Helgaas wrote:
> > > On Mon, Sep 29, 2014 at 03:29:19PM +0100, Liviu Dudau wrote:
> > > > This is my version 13 of the attempt at adding support for generic PCI host
> > > > bridge controllers. It contains only cleanups to make it play nice with the
> > > > linux-next tree as of 09/25. If Bjorn deems it safe, now that it looks like
> > > > asm-generic is going to revert some of its more aggresive patches, he has the
> > > > choice of queueing it into linux-next again.
> > > > ...
> > > 
> > > These patches above were already on my pci/host-generic branch and in
> > > linux-next:
> > > 
> > >    asm-generic/io.h: Fix ioport_map() for !CONFIG_GENERIC_IOMAP
> > This ^ ...
> > 
> > >    of/pci: Add pci_register_io_range() and pci_pio_to_address()
> > >    ARM: Define PCI_IOBASE as the base of virtual PCI IO space
> > 
> > and this ^ need to be refreshed from my series otherwise we will get conflicts with
> > asm-generic branch (either now or in the future). While the asm-generic/io.h
> > cast is arguably superflous, we need to define PCI_IOBASE as a void __iomem* to
> > match all other standard declarations of PCI_IOBASE.
> > 
> > >    of/pci: Define of_pci_range_to_resource() only when CONFIG_PCI=y
> > >    of/pci: Move of_pci_range_to_resources() to of/address.c
> > >    of/pci: Fix the conversion of IO ranges into IO resources
> > > 
> > > I added these three patches to my pci/host-generic branch:
> > > 
> > >    PCI: Add generic domain handling
> > >    of/pci: Add pci_get_new_domain_nr() and of_get_pci_domain_nr()
> > >    of/pci: Add support for parsing PCI host bridge resources from DT
> > 
> > I can see these patches added to pci/host-generic but not on pci/next.
> 
> Right.  I leave things on topic branches for a day or two to give a chance
> for Fengguang's auto-builder to find problems before I merge them into the
> more public "next" or "for-linus" branches.
> 
> > > Yinghai pointed out a problem with this one, so I omitted it:
> > > 
> > >    PCI: Assign unassigned bus resources in pci_scan_root_bus()
> > 
> > Thats fine, host bridge drivers will have to work around pci_scan_root_bus() reduced
> > functionality for now.
> 
> Well, it's not really "reduced functionality."  It is unchanged by this
> series and host bridge drivers can continue using it the same way they have
> in the past.  It's just that we'd like to make it smarter someday.
> 
> > > I added this one to my pci/host-generic branch:
> > > 
> > >    PCI: Add pci_remap_iospace() to map bus I/O resources
> > > 
> > > I assume this depends on the pci_scan_root_bus() change (if not, let me
> > > know), so I omitted this one:
> > > 
> > >    arm64: Add architectural support for PCI
> > 
> > No, there is no dependency there on pci_scan_root_bus(), it can go in the series.
> > The only thing that depends on a feature rich pci_scan_root_bus() is the host
> > bridge driver in order to be able to use only one line to process the root bus.
> 
> OK, I rebuilt pci/host-generic from scratch.  It consists of your v13
> patches + Arnd's build fix for pci_pio_to_address() in !CONFIG_OF configs.

Something went wrong with the integration, patch 02 adds another definition of 
of_pci_range_to_resource() before it is moved out of the header file for some reason.

Best regards,
Liviu

> 
> Bjorn
> 

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

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