linux-kernel - Re: [PATCH v2 2/3] IRQ/Gic-V3: Change arm-gic-its to support the Mbigen interrupt

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Date:	Fri, 26 Jun 2015 14:14:33 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	"majun (F)" <majun258@...wei.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Will Deacon <Will.Deacon@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	"jason@...edaemon.net" <jason@...edaemon.net>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"lizefan@...wei.com" <lizefan@...wei.com>,
	"huxinwei@...wei.com" <huxinwei@...wei.com>
Subject: Re: [PATCH v2 2/3] IRQ/Gic-V3: Change arm-gic-its to support the
 Mbigen interrupt

On 26/06/15 13:04, majun (F) wrote:
> 
> 
> 在 2015/6/26 18:40, Marc Zyngier 写道:
>>
>> My opinion is that we need to be able to lookup the domain from the core
>> code without any of these hacks, and this is what I'm working on at the
>> moment. There is no way external code will be allowed to mess with the
>> internals of the ITS.
>>
>> For the time being, just expose the domain with a helper (you can match
>> it with the of_node). 
> Do you mean add a fucntion in ITS likes below:
> 
> struct irq_domain *get_its_domain(struct device_node *node)
> {
> 	struct its_node *its = NULL;
> 	
> 	list_for_each_entry(its, &its_nodes, entry) {
> 		if(its->msi_chip.of_node == node)
> 			break;
> 	}
> 
> 	return (its)?its->domain:NULL;
> }

Yes.

> 
> How about add a '.match ' member in its_domain_ops
> just like:
> 	.match = get_its_domain;
> 
> So, I can use the fucntion 'irq_find_host' in mbigne driver

And that will only return the PCI/MSI domain, which is not of any help
to you.

At the moment, we register the PCI/MSI domain with the the of_node of
the ITS so that a PCI controller can match the its MSI controller, and
the ITS domain is completely anonymous (it doesn't have an of_node).

What I'm working on is a way to distinguish between several domains that
are identified by the same of_node, but cater for different bus types.
The current match function doesn't quite work for that case.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...
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