linux-kernel - Re: [PATCH 2/2] MIPS: implement pcibios_get_phb_of

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Date:	Thu, 11 Apr 2013 11:35:14 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Gabor Juhos <juhosg@...nwrt.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>
Subject: Re: [PATCH 2/2] MIPS: implement pcibios_get_phb_of_node

On Thu, Apr 11, 2013 at 11:32 AM, Gabor Juhos <juhosg@...nwrt.org> wrote:
> 2013.04.10. 18:31 keltezéssel, Bjorn Helgaas írta:
>> On Thu, Apr 4, 2013 at 12:01 PM, Gabor Juhos <juhosg@...nwrt.org> wrote:
>>> The of_node field of the device assigned to a
>>> PCI bus is used during scanning of the PCI bus.
>>> However on MIPS, the of_node field is assigned
>>> only after the bus has been scanned.
>>>
>>> Implement the architecture specific version of
>>> 'pcibios_get_phb_of_node'. Which ensures that the
>>> PCI driver core will initialize the of_node field
>>> before starting the scan.
>>>
>>> Also remove the local assignment of bus->dev.of_node,
>>> it is not needed after the patch.
>>>
>>> Signed-off-by: Gabor Juhos <juhosg@...nwrt.org>
>>
>> I removed the __weak annotation from include/linux/pci.h and applied
>> this patch to my pci/gabor-get-of-node.
>
> Thank you!
>
>> Give it a try and make sure
>> it solves your problem.  If so, and Ralph approves, I can push both
>> for v3.10.  It should appear at
>> http://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/log/?h=pci/gabor-get-of-node
>> soon.
>
> I have tried your patch on top of 3.9-rc6. The resulting kernel uses the
> architecture specific implementation, and it runs fine.
>
>   $ mipsel-openwrt-linux-readelf -s arch/mips/pci/built-in.o \
>     drivers/pci/built-in.o vmlinux.o | grep pcibios_get_phb_of_node
>       93: 0000046c    12 FUNC    GLOBAL DEFAULT    2 pcibios_get_phb_of_node
>     1433: 00012a2c   104 FUNC    WEAK   DEFAULT    2 pcibios_get_phb_of_node
>    31863: 001d4dbc    12 FUNC    GLOBAL DEFAULT    2 pcibios_get_phb_of_node
>   $
>
> For completeness, I have compiled it for X64 and for powerpc as well. I did not
> try to run these kernels, but the output of readelf seems to be ok:
>
>   $ readelf -s arch/x86/kernel/built-in.o drivers/pci/built-in.o vmlinux.o | \
>     grep pcibios_get_phb_of_node
>     2761: 000273a0    86 FUNC    GLOBAL DEFAULT    1 pcibios_get_phb_of_node
>     1705: 00018770    77 FUNC    WEAK   DEFAULT    1 pcibios_get_phb_of_node
>    60364: 000278a0    86 FUNC    GLOBAL DEFAULT    1 pcibios_get_phb_of_node
>   $
>
>   $ powerpc-openwrt-linux-readelf -s arch/powerpc/kernel/built-in.o \
>     drivers/pci/built-in.o  vmlinux.o | grep pcibios_get_phb_of_node
>     1002: 0000ca28    12 FUNC    GLOBAL DEFAULT    1 pcibios_get_phb_of_node
>     1485: 0001453c    88 FUNC    WEAK   DEFAULT    1 pcibios_get_phb_of_node
>    28959: 0000d598    12 FUNC    GLOBAL DEFAULT    1 pcibios_get_phb_of_node
>   $
>
>> Or if you prefer, you can take them through the MIPS tree.
>
> Either is fine.

Thanks for checking these out!  I put them in my "next" branch and
pushed it, so they should appear in v3.10.

Bjorn
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