linux-kernel - Re: [PATCH 01/11] ARM64 / PCI: introduce struct pci

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Message-ID: <20150527094702.GE2175@e106497-lin.cambridge.arm.com>
Date:	Wed, 27 May 2015 10:47:02 +0100
From:	Liviu Dudau <Liviu.Dudau@....com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Arnd Bergmann <arnd@...db.de>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yijing Wang <wangyijing@...wei.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"msalter@...hat.com" <msalter@...hat.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>
Subject: Re: [PATCH 01/11] ARM64 / PCI: introduce struct pci_controller for
 ACPI

On Tue, May 26, 2015 at 06:20:40PM +0100, Jiang Liu wrote:
> On 2015/5/27 0:58, Liviu Dudau wrote:
> > On Tue, May 26, 2015 at 01:49:14PM +0100, Hanjun Guo wrote:
> >> ARM64 ACPI based PCI host bridge init needs a arch dependent
> >> struct pci_controller to accommodate common PCI host bridge
> >> code which is introduced later, or it will lead to compile
> >> errors on ARM64.
> > 
> > Hi Hanjun,
> > 
> > Two questions: why don't you introduce this patch next to the
> > one that is going to make use of it (or even merge it there)?
> > Second, why is the whole struct pci_controller not surrounded
> > by #ifdef CONFIG_ACPI as you are implying that this is needed
> > only for ACPI?
> > 
> > Btw, looking through the whole series I'm not (yet) convinced
> > that this is needed at all.
> Hi Liviu,
> 	This structure is required by the requested patch set
> at http://patchwork.ozlabs.org/patch/472249/, which consolidates
> the common code to support PCI host bridge into ACPI core.
> Thanks!
> Gerry

Hi Jiang,

Thanks for pointing me on the right answer, I've missed that series!
Probably not the best place to comment on that series here, but I
wonder why did you not made the pci_controller structure available
in a more generic header file that can be included so that arches
don't have to redefine the structure every time. After all, you are
trying to consolidate things.

Oh, and pci_controller name throws a lot of false negatives, maybe
a more specific one (acpi_pci_controller?) would make things clear?

Best regards,
Liviu

> 
> > 
> > Best regards,
> > Liviu
> > 
> >>
> >> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> >> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> >> CC: Arnd Bergmann <arnd@...db.de>
> >> CC: Catalin Marinas <catalin.marinas@....com>
> >> CC: Liviu Dudau <Liviu.Dudau@....com>
> >> CC: Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>
> >> CC: Will Deacon <will.deacon@....com>
> >> ---
> >>  arch/arm64/include/asm/pci.h | 10 ++++++++++
> >>  1 file changed, 10 insertions(+)
> >>
> >> diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h
> >> index b008a72..7088495 100644
> >> --- a/arch/arm64/include/asm/pci.h
> >> +++ b/arch/arm64/include/asm/pci.h
> >> @@ -10,6 +10,16 @@
> >>  #include <asm-generic/pci-bridge.h>
> >>  #include <asm-generic/pci-dma-compat.h>
> >>  
> >> +struct acpi_device;
> >> +
> >> +struct pci_controller {
> >> +#ifdef CONFIG_ACPI
> >> +	struct acpi_device *companion;	/* ACPI companion device */
> >> +#endif
> >> +	int		segment;	/* PCI domain */
> >> +	int		node;		/* NUMA node */
> >> +};
> >> +
> >>  #define PCIBIOS_MIN_IO		0x1000
> >>  #define PCIBIOS_MIN_MEM		0
> >>  
> >> -- 
> >> 1.9.1
> >>
> > 
> 

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

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