Re: [Xenomai-core] preemptive doesn't work

[Roberto Bielli <roberto.bielli@domain.hid>]

Hi Gilles,

i try your workaround but nothing is changed.
I make another test. I try to comment out all the content of 
mxc_mask_irq() but the result is the same.
(the mxc_mask_irq is used also for acking interrupts but is not correct 
why it doesn't write in the processor manual)
Do you know if there is a code over the mxc_mask_irq that disable the 
interrupts ?

About interrupt gpio it should be a link with this behaviour ? ( i don't 
want gpio as interrupts )



Il 10/04/2012 14:40, Gilles Chanteperdrix ha scritto:
> On 04/10/2012 02:33 PM, Roberto Bielli wrote:
>> Il 10/04/2012 13:49, Gilles Chanteperdrix ha scritto:
>>> On 04/10/2012 12:39 PM, Roberto Bielli wrote:
>>>> Hi Gilles,
>>>>
>>>> i tried your code but th behavior is the same.
>>>>
>>>> Then i tried a linux base app and works correctly.
>>> In the exact same conditions? With the crunching task running with
>>> SCHED_FIFO, priority 1, and the periodic task running with SCHED_FIFO,
>>> priority 99, and the linux real-time throttling disabled?
>>>
>> Yes, and i see that every LATCH ( about ~10ms ) period the task with
>> higher priority is wakeup.
>> So a task with lower priority is interrupted by timer interrupt and
>> reschedule the task with higher priority.
>>
> The only thing I can think is that the timer interrupt in fact stays
> masked. You can try the following patch:
>
> diff --git a/arch/arm/plat-mxc/irq.c b/arch/arm/plat-mxc/irq.c
> index 8aee763..7e4cc2e 100644
> --- a/arch/arm/plat-mxc/irq.c
> +++ b/arch/arm/plat-mxc/irq.c
> @@ -94,12 +94,14 @@ EXPORT_SYMBOL(mxc_set_irq_fiq);
>   static void mxc_mask_irq(unsigned int irq)
>   {
>          __raw_writel(irq, avic_base + AVIC_INTDISNUM);
> +       __raw_readl(avic_base + AVIC_INTDISNUM);
>   }
>
>   /* Enable interrupt number "irq" in the AVIC */
>   static void mxc_unmask_irq(unsigned int irq)
>   {
>          __raw_writel(irq, avic_base + AVIC_INTENNUM);
> +       __raw_readl(avic_base + AVIC_INTENNUM);
>   }
>
>   static struct irq_chip mxc_avic_chip = {
>
>
> If I had to debug this issue, I would look at all the timer and
> interrupt controller registers value, to see what is wrong.
>
> You can also try the plain linux example with CONFIG_IPIPE on, but
> without CONFIG_XENOMAI.
>
> Other than that, without access to the board, it is hard for me to
> debug further, so I am afraid you are on your own.
>


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Roberto Bielli
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