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Date: Thu, 03 Jan 2013 18:21:02 +0100
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai] XNARCH_TIMER_IRQ
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To: Philippe Gerum <rpm@xenomai.org>
Cc: Jan Kiszka <jan.kiszka@siemens.com>, Xenomai <xenomai@xenomai.org>

On 01/03/2013 05:27 PM, Philippe Gerum wrote:
> On 01/03/2013 04:44 PM, Jan Kiszka wrote:
>> On 2013-01-03 16:16, Gilles Chanteperdrix wrote:
>>> On 01/02/2013 06:43 PM, Jan Kiszka wrote:
>>>> Hi,
>>>>
>>>> this may involve some refactoring of the HAL and a bit of I-pipe, so I
>>>> better ask first:
>>>>
>>>> Not sure when it changed, but XNARCH_TIMER_IRQ may no longer return the
>>>> same values when called on different CPUs. Therefore, It should rather
>>>> be called XNARCH_THIS_CPU_TIMER_IRQ now.
>>>>
>>>> Looking at its users (an I-pipe debug warning pointed it out), there are
>>>> two that don't expect this: xnintr_query_next() and format_irq_proc().
>>>> The former actually wants XNARCH_TIMER_IRQ(cpu), the latter needs
>>>> something like is_timer_irq_on_any_cpus(irq).
>>>>
>>>> So I would propose to refactor XNARCH_TIMER_IRQ and RTHAL_TIMER_IRQ
>>>> accordingly. But this unfortunately requires extensions of I-pipe to
>>>> provide something like __ipipe_hrtimer_irq(cpu) and
>>>> __ipipe_this_cpu_hrtimer_irq. And some ugly workaround in Xenomai for
>>>> older I-pipe versions.
>>>>
>>>> Does this make sense?
>>>
>>> Made something similar for forge:
>>> http://git.xenomai.org/?p=xenomai-gch.git;a=commitdiff;h=37ca257af466e7e5fbfb402b39f088487d048fd5;hp=a9971c363fd361b428f12200536bc5a01dff9c05
>>
> 
> Caution, this code is WIP. nktimer will have to move to the percpu 
> scheduler descriptor to complete this.

You mean nkclock? But does it make sense if the timer has the same irq
on all cpus?

-- 
					    Gilles.