linux-kernel - Re: [PATCH 00/28] Refine PCI scan interfaces and make generic pci host bridge

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Date:	Fri, 16 Jan 2015 11:12:43 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Yijing Wang <wangyijing@...wei.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	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>,
	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>,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH 00/28] Refine PCI scan interfaces and make generic pci host bridge

On Friday 16 January 2015 09:43:58 Yijing Wang wrote:
> This series is based on Bjorn's pci-next branch.

I think this is a very nice series, hope we can get this into 3.20.

I've replied with a few specific comments, but I see no show-stoppers
and I've already retracted a few comments after seeing the bigger
picture.

> After applied this series, we have following scan interfaces:
> 
> 1. pci_scan_bus_legacy() 
>    parent = NULL, default io/mem/bus resources.
>    for legacy pci scan
> 
> 2. pci_scan_root_bus()
>    for callers provide its own parent and io/mem/bus resources
>    but no platform specific pci_host_bridge operations
> 
> 3. pci_scan_root_bridge()
>    for callers provide its own parent and io/mem/bus resources
>    and pci_host_bridge_ops.

I still think we will need a split interface for drivers to use
that want to call pci_create_host_bridge() manually, but that can
come later as we try to migrate the arm32 host bridge drivers to
a generic interface away from pci_common_init_dev().

Another follow-up would be to move more of the pcibios_*() functions
into pci_host_bridge_ops.

	Arnd
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