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

Marc Zyngier marc.zyngier at arm.com
Fri Jun 26 06:14:33 PDT 2015

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;
> }


> 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.


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

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