linux-kernel - Re: [PATCH 3/5] arm64, pci: Allow RC drivers to supply pcibios_add

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Date:	Thu, 16 Jul 2015 10:00:36 -0700
From:	David Daney <ddaney@...iumnetworks.com>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:	David Daney <ddaney.cavm@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Jason Cooper" <jason@...edaemon.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Robert Richter <rrichter@...ium.com>,
	"David Daney" <david.daney@...ium.com>
Subject: Re: [PATCH 3/5] arm64, pci: Allow RC drivers to supply pcibios_add_device()
 implementation.

On 07/16/2015 02:04 AM, Lorenzo Pieralisi wrote:
> Hi David,
>
> On Wed, Jul 15, 2015 at 05:54:43PM +0100, David Daney wrote:
>> From: David Daney <david.daney@...ium.com>
>>
[...]
>> diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
>> index 4095379..3356023 100644
>> --- a/arch/arm64/kernel/pci.c
>> +++ b/arch/arm64/kernel/pci.c
>> @@ -38,11 +38,21 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
>>   	return res->start;
>>   }
>>
>> +static int (*pcibios_add_device_impl)(struct pci_dev *);
>> +
>> +void set_pcibios_add_device(int (*arg)(struct pci_dev *))
>> +{
>> +	pcibios_add_device_impl = arg;
>> +}
>> +
>>   /*
>>    * Try to assign the IRQ number from DT when adding a new device
>>    */
>>   int pcibios_add_device(struct pci_dev *dev)
>>   {
>> +	if (pcibios_add_device_impl)
>> +		return pcibios_add_device_impl(dev);
>
> I am totally against this (and to be honest by reading the other
> patches I failed to understand why you even need it), see above.
>

It is because ...


> Thanks,
> Lorenzo
>
>> +
>>   	dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);


  ... this is total crap.  But I didn't want to break existing systems.

The PCI RC drivers need a way to configure the legacy virtual-wire 
interrupts, because the existing code doesn't do it.

David Daney



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