linux-kernel - Re: [PATCH v5 7/7] pci: Add support for creating a generic host

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Message-id: <000b01cf3851$0fe55d30$2fb01790$%han@samsung.com>
Date:	Wed, 05 Mar 2014 17:58:22 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Liviu Dudau' <liviu@...au.co.uk>
Cc:	'Liviu Dudau' <Liviu.Dudau@....com>,
	'linux-pci' <linux-pci@...r.kernel.org>,
	'Bjorn Helgaas' <bhelgaas@...gle.com>,
	'Catalin Marinas' <Catalin.Marinas@....com>,
	'Will Deacon' <Will.Deacon@....com>,
	'linaro-kernel' <linaro-kernel@...ts.linaro.org>,
	'Benjamin Herrenschmidt' <benh@...nel.crashing.org>,
	'LKML' <linux-kernel@...r.kernel.org>,
	devicetree@...r.kernel.org,
	'LAKML' <linux-arm-kernel@...ts.infradead.org>,
	'Tanmay Inamdar' <tinamdar@....com>,
	'Arnd Bergmann' <arnd@...db.de>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH v5 7/7] pci: Add support for creating a generic host_bridge
 from device tree

On Wednesday, March 05, 2014 5:33 PM, Liviu Dudau wrote:
> On Wed, Mar 05, 2014 at 10:20:28AM +0900, Jingoo Han wrote:
> > On Wednesday, March 05, 2014 12:50 AM, Liviu Dudau wrote:
> > >
> > > Several platforms use a rather generic version of parsing
> > > the device tree to find the host bridge ranges. Move the common code
> > > into the generic PCI code and use it to create a pci_host_bridge
> > > structure that can be used by arch code.
> > >
> > > Based on early attempts by Andrew Murray to unify the code.
> > > Used powerpc and microblaze PCI code as starting point.
> > >
> > > Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
> > >
> > > diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
> > > index 8708b652..800678a 100644
> > > --- a/drivers/pci/host-bridge.c
> > > +++ b/drivers/pci/host-bridge.c

[.....]

> > > +
> > > +	/* Apply architecture specific fixups for the ranges */
> > > +	pcibios_fixup_bridge_ranges(resources);
> >
> > It also makes compile problem with exynos_defconfig as below:
> >
> > drivers/built-in.o: In function `pci_host_bridge_of_get_ranges':
> > drivers/pci/host-bridge.c:157: undefined reference to `pcibios_fixup_bridge_ranges'
> 
> Does that mean that exynos_defconfig doesn't define CONFIG_OF? How do you
> compile all the .dts files then? Should CONFIG_OF not be added to the default config
> file?

Now, I am testing your patches with ARM32 platform such as
Exynos SoCs. And the default 'exynos_defconfig' already defines
CONFIG_OF=y. (./arch/arm/configs/exynos_defconfig)

> 
> Other than that, your comment is correct. drivers/pci/host-bridge.c gets compiled
> in regardless of CONFIG_OF and I need to provide an empty implementation for
> pcibios_fixup_bridge_ranges().

There is no pcibios_fixup_bridge_ranges() in ./arch/arm/ directory.
So, it makes the compile problem.

I think that the empty implementation for pcibios_fixup_bridge_ranges()
may be necessary, in order to the compile problem.
Or, __weak pcibios_fixup_bridge_ranges() would be used.

Best regards,
Jingoo Han

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