linux-kernel - Re: [Patch v4 5/8] ARM64/PCI/ACPI: Introduce struct pci

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Date:	Tue, 2 Jun 2015 10:35:25 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Marc Zyngier <Marc.Zyngier@....com>,
	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Yijing Wang <wangyijing@...wei.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Lv Zheng <lv.zheng@...el.com>,
	"lenb @ kernel . org" <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"x86 @ kernel . org" <x86@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [Patch v4 5/8] ARM64/PCI/ACPI: Introduce struct pci_controller
 for ACPI

On Tue, Jun 02, 2015 at 07:12:53AM +0100, Jiang Liu wrote:
> From: Hanjun Guo <hanjun.guo@...aro.org>
> 
> 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.
> 
> 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>
> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.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 b008a72f8bc0..70884957f253 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 */
> +};

There is nothing ARM64 specific in this structure. The only
reason I see you want to keep it arch specific is the iommu
pointer on x86, but I think we should find a way to make
the common bits shared across archs (ie the struct above) and
add (maybe a void*) to the generic struct to cater for arch
specific data.

Thoughts ?

Lorenzo

> +
>  #define PCIBIOS_MIN_IO		0x1000
>  #define PCIBIOS_MIN_MEM		0
>  
> -- 
> 1.7.10.4
> 
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