linux-kernel - Re: [patch 07/16] genirq: Introduce helper irq_domain_set

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Date:	Tue, 18 Nov 2014 20:38:37 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	"Yun Wu (Abel)" <wuyun.wu@...wei.com>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Grant Likely <grant.likely@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Yijing Wang <wangyijing@...wei.com>
Subject: Re: [patch 07/16] genirq: Introduce helper irq_domain_set_info()
 to reduce duplicated code

On 2014/11/18 19:47, Yun Wu (Abel) wrote:
> On 2014/11/18 18:03, Thomas Gleixner wrote:
> 
>> On Tue, 18 Nov 2014, Yun Wu (Abel) wrote:
>>
>>> Hi Thomas, Jiang,
>>> On 2014/11/12 21:43, Thomas Gleixner wrote:
>>>
>>>> From: Jiang Liu <jiang.liu@...ux.intel.com>
>>> [...]
>>>> +void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
>>>> +			 irq_hw_number_t hwirq, struct irq_chip *chip,
>>>> +			 void *chip_data, irq_flow_handler_t handler,
>>>> +			 void *handler_data, const char *handler_name)
>>>> +{
>>>> +	irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data);
>>>> +	__irq_set_handler(virq, handler, 0, handler_name);
>>>> +	irq_set_handler_data(virq, handler_data);
>>>> +}
>>>
>>> When stacked domain enabled, there will be a semantic shift to the linux interrupt
>>> identifiers. The @virq now delivers much more than before.
>>> More specifically, now we need both @virq and @domain, rather than only @irq, to
>>> determine which irq_data we want to configure. And once we configure @irq without
>>> providing the exact domain, it means we are configuring all the domains related to
>>> that @irq. So I think this routine just messed all things up.
>>
>> You can mess up anything by using an interface in the wrong way. Open
>> coding will not make that harder.
>>
> 
> But what's the correct way to use this interface?
Hi Yun,
	It's to be used by interrupt controller drivers to implement
hierarchy irqdomains.
Regards!
Gerry

> 
> Thanks,
> 	Abel
> 
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