linux-kernel - Re: [PATCH 3/9] irq: convert generic-chip to use irq

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Message-ID: <CACxGe6t=ngbzNLkX+df8gP0aoMmgnsVqn2V2eRHpGi5FoFci_w@mail.gmail.com>
Date:	Thu, 15 Dec 2011 08:55:32 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Rob Herring <robherring2@...il.com>
Cc:	Shawn Guo <shawn.guo@...escale.com>, Kevin Hilman <khilman@...com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Tony Lindgren <tony@...mide.com>,
	Linus Walleij <linus.ml.walleij@...il.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Barry Song <baohua.song@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/9] irq: convert generic-chip to use irq_domain

On Thu, Dec 15, 2011 at 6:56 AM, Rob Herring <robherring2@...il.com> wrote:
> Shawn,
>
> On 12/15/2011 07:39 AM, Rob Herring wrote:
>> On 12/14/2011 11:55 PM, Shawn Guo wrote:
>>> On Thu, Dec 15, 2011 at 01:25:20PM +0800, Shawn Guo wrote:
>>>> On Wed, Dec 14, 2011 at 09:28:52AM -0600, Rob Herring wrote:
>>>>> From: Rob Herring <rob.herring@...xeda.com>
>>>>>
>>>>> Add irq domain support to irq generic-chip. This enables users of
>>>>> generic-chip to support dynamic irq assignment needed for DT interrupt
>>>>> binding. Users must be converted to use irq_data.hwirq for determining
>>>>> local interrupt numbers rather than using the Linux irq number.
>>>>>
>>>>> irq_base is kept for now as there are a few users of it. Once they
>>>>> are converted to use the irq domain, it can be removed.
>>>>>
>>>>> Signed-off-by: Rob Herring <rob.herring@...xeda.com>
>>>>> Cc: Thomas Gleixner <tglx@...utronix.de>
>>>>> ---
>>>>
>>>> Tested-by: Shawn Guo <shawn.guo@...aro.org>
>>>>
>>> Sorry, I have to take that tag back after I correct my test setup.
>>> It does not work for imx5 TZIC case, because the following change
>>> I suggested before is missed.
>>>
>>> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
>>> index eb763f7..2a2aac1 100644
>>> --- a/kernel/irq/irqdomain.c
>>> +++ b/kernel/irq/irqdomain.c
>>> @@ -39,7 +39,7 @@ void irq_domain_add(struct irq_domain *domain)
>>>                         return;
>>>                 }
>>>                 d->domain = domain;
>>> -               d->hwirq = hwirq;
>>> +               d->hwirq = hwirq - domain->hwirq_base;
>>
>> This is a problem. It entirely defeats the point of hwirq_base and it
>> would break the GIC. We need to fix this in the generic irq chip.
>>
>
> I think I found a fix. Can you try 's/d->hwirq/(d->hwirq % 32)/' in
> generic-chip.c.

Ugh, but that hard codes an assumption that a domain cannot have more
that 32 irqs.

/me goes to dig into irq_domain code...

g.
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