From: Philippe Gerum <rpm@xenomai.org>
To: xenomai@xenomai.org
Subject: Re: [Xenomai] Powepc 8360 interrupt timing question
Date: Tue, 04 Sep 2012 18:16:12 +0200 [thread overview]
Message-ID: <5046294C.7070102@xenomai.org> (raw)
In-Reply-To: <504627A4.90505@xenomai.org>
On 09/04/2012 06:09 PM, Philippe Gerum wrote:
> On 09/04/2012 05:53 PM, Lennart Sorensen wrote:
>> On Tue, Sep 04, 2012 at 05:43:39PM +0200, Philippe Gerum wrote:
>>> - which I-pipe version exactly? Seven different patches were released
>>> for 3.0.x/powerpc over time.
>>>
>>> - which Xenomai release? 2.6.0, 2.6.1, current HEAD?
>>
>> xenomai 2.6.0, kernel 3.0.22, ipipe 3.0.8-powerpc-2.13-04
>>
>>> You seem to be rehashing an old question. The answer at that time was:
>>>
>>> - there was an issue with processing cascaded interrupts in the former
>>> pipeline architecture. This has been solved in recent patches with the
>>> introduction of the pipeline "core" series (core-3.2 and above, commit
>>> a4b909ccf80c5a).
>>
>> Hmm, I wonder if that would apply reasonably cleanly on top of the
>> 3.0.8 patch. Might be worth a try.
>
> I see no showstopper in doing this, many if not most issues will be
> related to name changes. However, the implementation of the low level
> IRQ dispatcher is different between the core series and the former one.
> So there will be some glue logic to provide. Understanding the way
> __ipipe_dispatch_irq works with respect to handling cascaded IRQs should
> provide enough insight to match the related code in
> arch/powerpc/include/asm/qe_ic.h.
You will need these too:
eb3ce2324618
f2ca3c2baf58b
>
>>
>>> - handling level IRQs in userland is generally a bad idea.
>>
>> Unfortunately edge IRQs don't really share well.
>>
>
> No, but if the level IRQ is shared between the two domains, the
> situation is even worse with handling the RT one in userland.
>
--
Philippe.
next prev parent reply other threads:[~2012-09-04 16:16 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-04 15:12 [Xenomai] Powepc 8360 interrupt timing question Makarand Pradhan
2012-09-04 15:43 ` Philippe Gerum
2012-09-04 15:53 ` Lennart Sorensen
2012-09-04 16:09 ` Philippe Gerum
2012-09-04 16:14 ` Gilles Chanteperdrix
2012-09-04 16:16 ` Philippe Gerum [this message]
2012-09-04 18:22 ` Makarand Pradhan
2012-09-07 12:50 ` Makarand Pradhan
2012-09-04 16:22 ` Gilles Chanteperdrix
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