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 18:28:07 +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


Hi Marc:

在 2015/6/26 16:44, Marc Zyngier 写道:
> 
> You can then keep your MBI stuff in a separate file, and call into 
> its_msi_prepare.
> 
Thanks for your good suggestion!
I have two questions:

Question 1:

I found the ‘its_msi_preapare ' defined without static.
So,I guess you mean I can call this fucntion directly
from mbigen driver, right?
or I need make the code likes below and leave these code in ITS?

static struct mbigen_domain_ops its_mbigen_ops = {
+	.mbigen_prepare	= its_msi_prepare,
};

static struct mbigen_domain_info its_mbigen_domain_info = {
	.ops	= &its_mbigen_ops,
};

Question 2:

@@ -1489,6 +1538,18 @@ static int its_probe(struct device_node *node, struct irq_domain *parent)
 		err = of_pci_msi_chip_add(&its->msi_chip);
 		if (err)
 			goto out_free_domains;
+
+		if (IS_ENABLED(CONFIG_MBIGEN_IRQ_DOMAIN)) {
+			its->mbi_chip.domain = its_mbigen_create_irq_domain(node,
+										&its_mbigen_domain_info,
+										its->domain);
+
+			if (!its->mbi_chip.domain) {
+				err = -ENOMEM;
+				pr_warn_once("ITS:no mbigen chip found\n");
+				goto out_free_mbigen;
+			}
+		}
 	}

 	spin_lock(&its_lock);
@@ -1497,6 +1558,9 @@ static int its_probe(struct device_node *node, struct irq_domain *parent)

 	return 0;

+out_free_mbigen:
+	if (its->mbi_chip.domain)
+		irq_domain_remove(its->mbi_chip.domain);
 out_free_domains:
 	if (its->msi_chip.domain)
 		irq_domain_remove(its->msi_chip.domain);

What's you opinion about the code above
Leave it in ITS or create the mbi irq domain in mbigen driver?
If I have to create mbi irq domain in mbigen driver,
I need a pointer of its domain.

For this problem, I think i can solve it by using its_nodes’
in mbigen driver *if*
[1] add a member " struct device_node *node" in 'struct its_node'
[2] in 'its_probe' function , add
	its->node = node;
[3] remove the static definition from  'static LIST_HEAD(its_nodes);'

How is you opinion?

Thansks again!



>> Now, all these functions and data structure are defined as static.
>> to use them, I have to remove the 'static' definition and put them
>> in a head file （ create a new head file).
> 
> I don't want to see these functions and structure leaking out of the
> ITS code unless we're absolutely forced to do so.  The above code
> shows you one possible way to solve the problem.
> 

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