linux-kernel - Re: [PATCH v6 13/30] PCI: Introduce new scan function pci_scan_host

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Message-ID: <20150312032515.GF10949@google.com>
Date:	Wed, 11 Mar 2015 22:25:15 -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 13/30] PCI: Introduce new scan function
 pci_scan_host_bridge()

On Mon, Mar 09, 2015 at 10:34:10AM +0800, Yijing Wang wrote:
> Introduce new scan function pci_scan_host_bridge() to
> support host bridge drivers that need to provide platform
> own pci_host_bridge_ops.
> 
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---
>  drivers/pci/probe.c |   22 ++++++++++++++++++++++
>  include/linux/pci.h |    4 ++++
>  2 files changed, 26 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 59d9be3..99f17e3 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -2064,6 +2064,28 @@ static struct pci_bus *__pci_scan_root_bus(
>  	return b;
>  }
>  
> +struct pci_host_bridge *pci_scan_host_bridge(struct device *parent,
> +		u32 db, struct pci_ops *ops, void *sysdata,
> +		struct list_head *resources,
> +		struct pci_host_bridge_ops *phb_ops)

Drop the "phb_" prefix.

> +{
> +	struct pci_host_bridge *host;
> +	struct pci_bus *bus;
> +
> +	host = pci_create_host_bridge(parent, db, resources,
> +			sysdata, phb_ops);
> +	if (!host)
> +		return NULL;
> +
> +	bus = __pci_scan_root_bus(host, ops);
> +	if (!bus)
> +		pci_free_host_bridge(host);
> +
> +	return host;
> +}
> +EXPORT_SYMBOL(pci_scan_host_bridge);
> +
> +
>  struct pci_bus *pci_scan_root_bus(struct device *parent, u32 db,
>  		struct pci_ops *ops, void *sysdata, struct list_head *resources)
>  {
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index e9922b1..28eafb5 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -790,6 +790,10 @@ void pci_bus_release_busn_res(struct pci_bus *b);
>  struct pci_bus *pci_scan_root_bus(struct device *parent, u32 dombus,
>  					     struct pci_ops *ops, void *sysdata,
>  					     struct list_head *resources);
> +struct pci_host_bridge *pci_scan_host_bridge(struct device *parent,
> +		u32 dombus, struct pci_ops *ops, void *sysdata,
> +		struct list_head *resources,
> +		struct pci_host_bridge_ops *phb_ops);
>  struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,
>  				int busnr);
>  void pcie_update_link_speed(struct pci_bus *bus, u16 link_status);
> -- 
> 1.7.1
> 
> --
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