linux-kernel - Re: [PATCH v7 4/7] PCI: Add fwnode_handle to pci

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Date:	Wed, 09 Dec 2015 17:06:57 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Jake Oshins <jakeo@...rosoft.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	KY Srinivasan <kys@...rosoft.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"vkuznets@...hat.com" <vkuznets@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH v7 4/7] PCI: Add fwnode_handle to pci_sysdata

On 09/12/15 16:54, Jake Oshins wrote:
>> -----Original Message-----
>> From: Marc Zyngier [mailto:marc.zyngier@....com]
>> Sent: Wednesday, December 9, 2015 8:51 AM
>> To: Jake Oshins <jakeo@...rosoft.com>; gregkh@...uxfoundation.org; KY
>> Srinivasan <kys@...rosoft.com>; linux-kernel@...r.kernel.org;
>> devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com;
>> vkuznets@...hat.com; tglx@...utronix.de; Haiyang Zhang
>> <haiyangz@...rosoft.com>; bhelgaas@...gle.com; linux-
>> pci@...r.kernel.org
>> Subject: Re: [PATCH v7 4/7] PCI: Add fwnode_handle to pci_sysdata
>>
>> On 05/12/15 00:36, 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 | 15 +++++++++++++++
>>>  include/asm-generic/pci.h  |  4 ++++
>>>  2 files changed, 19 insertions(+)
>>>
>>
>> [...]
>>
>>> diff --git a/include/asm-generic/pci.h b/include/asm-generic/pci.h
>>> index f24bc51..4092886 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
>>> +
>>>  #endif /* _ASM_GENERIC_PCI_H */
>>>
>>
>> This breaks at least arm64 (as you can see from the reply to patch #5,
>> because it does have its own asm/pci.h. Instead, how about moving this
>> to linux/pci.h, just after the include of asm/pci.h? I just gave it a
>> go, and it seems to work nicely (the first hunk fixes the rest of the
>> arm64 compile issue):
> 
> Thank you.  I was just working through how to do that.  I lost a
> couple of days trying to figure out how to cross-compile for arm64 to
> check that any fix that I made actually worked.  (In the process,
> I've completely messed up my development machine.  Any pointers to
> the right strategy would be appreciated.)

My own strategy is pretty simple. It involves:
- downloading a binary toolchain ([1] for example)
- untar this somewhere, putting the
gcc-linaro-5.2-2015.11-x86_64_aarch64-linux-gnu/bin directory in your PATH
- and then the usual "make ARCH=arm64 defconfig && make ARCH=arm64
CROSS_COMPILE=aarch64-linux-gnu- all"

That's of course assuming you're using a Linux x86-64 box for
cross-compiling. I also cross-compile from 32bit ARM, but I doubt you'd
be interested... ;-)

Cheers,

	M.

[1]
https://releases.linaro.org/components/toolchain/binaries/5.2-2015.11/aarch64-linux-gnu/gcc-linaro-5.2-2015.11-x86_64_aarch64-linux-gnu.tar.xz
-- 
Jazz is not dead. It just smells funny...
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