linux-kernel - Re: [PATCH v6 4/7] PCI: Add fwnode_handle to pci

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Date:	Thu, 3 Dec 2015 14:53:26 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	jakeo@...rosoft.com, gregkh@...uxfoundation.org, kys@...rosoft.com,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	olaf@...fle.de, apw@...onical.com, vkuznets@...hat.com,
	tglx@...hat.com, haiyangz@...rosoft.com, marc.zyngier@....com,
	bhelgaas@...gle.com, linux-pci@...r.kernel.org
Subject: Re: [PATCH v6 4/7] PCI: Add fwnode_handle to pci_sysdata

On 2015/11/3 5:33, jakeo@...rosoft.com wrote:
> From: Jake Oshins <jakeo@...rosoft.com>
> 
> This patch adds an fwnode_handle to struct pci_sysdata, which is
> used by the next patch in the series when trying to locate an
> IRQ domain associated with a root PCI bus.
> 
> Signed-off-by: Jake Oshins <jakeo@...rosoft.com>
> ---
>  arch/x86/include/asm/pci.h | 13 +++++++++++++
>  include/asm-generic/pci.h  |  4 ++++
>  2 files changed, 17 insertions(+)
> 
> diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
> index 4625943..fb74453 100644
> --- a/arch/x86/include/asm/pci.h
> +++ b/arch/x86/include/asm/pci.h
> @@ -20,6 +20,9 @@ struct pci_sysdata {
>  #ifdef CONFIG_X86_64
>  	void		*iommu;		/* IOMMU private data */
>  #endif
> +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> +	void		*fwnode;	/* IRQ domain for MSI assignment */
> +#endif
>  };
>  
>  extern int pci_routeirq;
> @@ -41,6 +44,16 @@ static inline int pci_proc_domain(struct pci_bus *bus)
>  }
>  #endif
>  
> +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> +static inline void *_pci_root_bus_fwnode(struct pci_bus *bus)
> +{
> +	struct pci_sysdata *sd = bus->sysdata;
> +	return sd->fwnode;
> +}
> +
> +#define pci_root_bus_fwnode	_pci_root_bus_fwnode
> +#endif
> +
>  /* Can be used to override the logic in pci_scan_bus for skipping
>     already-configured bus numbers - to be used for buggy BIOSes
>     or architectures with incomplete PCI setup by the loader */
> diff --git a/include/asm-generic/pci.h b/include/asm-generic/pci.h
> index f24bc51..3fde985 100644
> --- a/include/asm-generic/pci.h
> +++ b/include/asm-generic/pci.h
> @@ -21,4 +21,8 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
>  #define PCI_DMA_BUS_IS_PHYS	(1)
>  #endif
>  
> +#ifndef pci_root_bus_fwnode
> +#define pci_root_bus_fwnode(bus)	((void)(bus),NULL)
> +#endif
Hi Jakeo,
	For x86, all PCI devices share the same MSI controller. But I'm
not sure whether it may have per-bus/per-device MSI controllers on other
archs. If there may be multiple MSI controllers serving PCI devices
under the same PCI root, it would be better to use some thing like
pci_get_msi_fwnode(bus) or similar.
Thanks,
Gerry


> +
>  #endif /* _ASM_GENERIC_PCI_H */
> 
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