linux-kernel - Re: [PATCH 08/57] microblaze_v7: Interrupt handling, timer support, selfmod code

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Date:	Fri, 20 Mar 2009 15:08:06 +0100
From:	Michal Simek <monstr@...str.eu>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	LKML <linux-kernel@...r.kernel.org>, john.williams@...alogix.com,
	John Stultz <johnstul@...ibm.com>
Subject: Re: [PATCH 08/57] microblaze_v7: Interrupt handling, timer support,
 selfmod code

Hi Thomas,

> On Thu, 19 Mar 2009, Michal Simek wrote:
>>>> +	__do_IRQ(irq);
>>> You use irq chips now and you set the type handlers (edge/level), but
>>> you still call __do_IRQ() the all in one fits nothing handler, which
>>> is going to be deprecated and removed.
>> I know about.
>>> Please call 
>>>        generic_handle_irq(irq);
>>>
>>> which will call the correct flow handlers.
>> I would like to use it but don't work with edge interrupt.
>> __do_IRQ handle it in right way.
>>
>> I used this implementation but I did some change edge/level handling and I can't
>> use it.
>> http://developer.petalogix.com/git/gitweb.cgi?p=linux-2.6-microblaze.git;a=blob_plain;f=arch/microblaze/kernel/irq.c;hb=3645d887ad6443a262bbeddf384038321172db2b
>>
>> Any hints what could be wrong?
>  
> Look at the different handling schemes of __do_IRQ and handle_edge_irq
> vs. the chip functions:
> 
> __do_IRQ() does:
> {
> 	   chip->ack();
> 	   
> 	   handle_IRQ_event();
> 
> 	   chip->end();
> }
> 
> handle_edge_irq() does:
> {
> 	if ((desc->status & (IRQ_INPROGRESS | IRQ_DISABLED)) ||
>                     !desc->action)) {
>                 desc->status |= (IRQ_PENDING | IRQ_MASKED);
>                 mask_ack_irq(desc, irq);
> 		goto out_unlock;
> 	}
> 
> 	chip->ack();
> 	handle_IRQ_event();
> 
> }
> 
> I guess the problem is in your chip->xxx functions.

I fixed it. There were one additional line.
+ I set GENERIC_HARDIRQS_NO__DO_IRQ=y.

BTW: Below is full chip description where function enable is unmask
and disable is mask. Do I have keep there enable and disable function pointers?
I commented them and works without them too.


static struct irq_chip intc_dev = {
	.name = "Xilinx INTC",
	.enable = intc_enable_or_unmask,
	.unmask = intc_enable_or_unmask,
	.disable = intc_disable_or_mask,
	.mask = intc_disable_or_mask,
	.ack = intc_ack,
	.mask_ack = intc_mask_ack,
	.end = intc_end,
};

Thanks,
Michal
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