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 14:31:41 +0800
From:	"majun (F)" <majun258@...wei.com>
To:	<Catalin.Marinas@....com>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <Will.Deacon@....com>,
	<mark.rutland@....com>, <marc.zyngier@....com>,
	<jason@...edaemon.net>, <tglx@...utronix.de>, <lizefan@...wei.com>,
	<huxinwei@...wei.com>
Subject: Re: [PATCH v2 2/3] IRQ/Gic-V3: Change arm-gic-its to support the
 Mbigen interrupt

Hi Thomas:

在 2015/6/12 10:49, Ma Jun 写道:

> +static int its_mbigen_prepare(struct irq_domain *domain, struct mbi_desc *desc,
> +								int hwirq, struct mbi_alloc_info *arg)
> +{
> +	struct its_node *its = domain->parent->host_data;
> +	struct its_device *its_dev;
> +	u32 dev_id;
> +
> +	dev_id = desc->msg_id;
> +
> +	its_dev = its_find_device(its, dev_id);
> +	if (!its_dev) {
> +		its_dev = its_create_device(its, dev_id, desc->lines);
> +		if (!its_dev)
> +			return -ENOMEM;
> +	}
> +
> +	arg->scratchpad[0].ptr = its_dev;
> +	arg->scratchpad[1].ptr = NULL;
> +
> +	arg->desc = desc;
> +	arg->hwirq = hwirq;
> +	return 0;
> +}
> +
> +static struct mbigen_domain_ops its_mbigen_ops = {
> +	.mbigen_prepare		= its_mbigen_prepare,
> +};
> +
> +static struct mbigen_domain_info its_mbigen_domain_info = {
> +	.ops	= &its_mbigen_ops,
> +};
> +

what's you opinion about the function 'its_mbigen_prepare' ?
put this function in irq-gic-v3-its.c or move to mbigen driver ?

If I move this function to mbigen driver, some its fuctions
(ex. its_find_device, its_create_device) and struct data (ex its_node)
would be used in mbigen driver.

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'm not sure which way is better .




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