linux-kernel - Re: [PATCH v6 08/30] PCI: Introduce pci_host_assign_domain

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Message-ID: <20150312013918.GC10949@google.com>
Date:	Wed, 11 Mar 2015 20:39:18 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Yijing Wang <wangyijing@...wei.com>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>, linux-pci@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>, linux-kernel@...r.kernel.org,
	Marc Zyngier <marc.zyngier@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Tony Luck <tony.luck@...el.com>, linux-ia64@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Guan Xuetao <gxt@...c.pku.edu.cn>, linux-alpha@...r.kernel.org,
	linux-m68k@...ts.linux-m68k.org, Liviu Dudau <liviu@...au.co.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH v6 08/30] PCI: Introduce pci_host_assign_domain_nr() to
 assign domain

On Mon, Mar 09, 2015 at 10:34:05AM +0800, Yijing Wang wrote:
> Introduce pci_host_assign_domain_nr() to assign domain
> number for pci_host_bridge. Later we will remove
> pci_bus_assign_domain_nr().
> 
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---
>  drivers/pci/pci.c   |   20 +++++++++++++++-----
>  include/linux/pci.h |    4 ++++
>  2 files changed, 19 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 81f06e8..c49eec1 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -4501,10 +4501,10 @@ int pci_get_new_domain_nr(void)
>  }
>  
>  #ifdef CONFIG_PCI_DOMAINS_GENERIC
> -void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
> +static int pci_assign_domain_nr(struct device *dev)
>  {
>  	static int use_dt_domains = -1;
> -	int domain = of_get_pci_domain_nr(parent->of_node);
> +	int domain = of_get_pci_domain_nr(dev->of_node);
>  
>  	/*
>  	 * Check DT domain and use_dt_domains values.
> @@ -4538,12 +4538,22 @@ void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
>  		use_dt_domains = 0;
>  		domain = pci_get_new_domain_nr();
>  	} else {
> -		dev_err(parent, "Node %s has inconsistent \"linux,pci-domain\" property in DT\n",
> -			parent->of_node->full_name);
> +		dev_err(dev, "Node %s has inconsistent \"linux,pci-domain\" property in DT\n",
> +			dev->of_node->full_name);
>  		domain = -1;
>  	}
>  
> -	bus->domain_nr = domain;
> +	return domain;
> +}
> +
> +void pci_host_assign_domain_nr(struct pci_host_bridge *host)
> +{
> +	host->domain = pci_assign_domain_nr(host->dev.parent);
> +}
> +
> +void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
> +{
> +	bus->domain_nr = pci_assign_domain_nr(parent);
>  }
>  #endif
>  #endif
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 8b3d245..2b1b998 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1327,11 +1327,15 @@ static inline int pci_domain_nr(struct pci_bus *bus)
>  	return bus->domain_nr;
>  }
>  void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent);
> +void pci_host_assign_domain_nr(struct pci_host_bridge *host);

I do not think this needs to be in include/linux/pci.h.  It's called only
from drivers/pci/host-bridge.c, so at most, it needs to be in
drivers/pci/pci.h.

Better still would be if the definition could be moved from
drivers/pci/pci.c to drivers/pci/host-bridge.c so we wouldn't need anything
in a header file at all.

>  #else
>  static inline void pci_bus_assign_domain_nr(struct pci_bus *bus,
>  					struct device *parent)
>  {
>  }
> +static inline void pci_host_assign_domain_nr(struct pci_host_bridge *host)
> +{
> +}
>  #endif
>  
>  /* some architectures require additional setup to direct VGA traffic */
> -- 
> 1.7.1
> 
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