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

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Message-ID: <558D3FDA.6000903@huawei.com>
Date:	Fri, 26 Jun 2015 20:04:42 +0800
From:	"majun (F)" <majun258@...wei.com>
To:	Marc Zyngier <marc.zyngier@....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



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;
}

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

>In the long run, you should be able to look it up
> directly from the domain list.
> 
I think the domain list you said is 'irq_domain_list'
which defined in Irqdomain.c
static LIST_HEAD(irq_domain_list);

Thanks!

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