Re: [Xenomai] Hilscher driver for cifX boards

[Jan Kiszka <jan.kiszka@siemens.com>]

On 2013-02-26 10:29, Jerome Poncin wrote:
> Hello,
> 
> I have a problem with driver for Hilscher cifx with IRQ.
> 
> All driver run good (I verified in polling mode) but in case I activate
> IRQ the system freeze.
> 
> I checked parameters of "rtdm_irq_request" function without success (all
> seems good) ! I tried to see on internet to get some information about
> the use of "rtdm_irq_request", or compare my code with other driver but
> it's not easy...
> I give you in attached file my code because I have no idea about my
> problem, and it's really difficult to have some information or trace
> after system freeze...
> Do you have an idea about my problem ?

> static inline int cifx_handler(rtdm_irq_t *irq)
         ^^^^^^
But I suspect the compiler is smart enough to ignore this.

Is the line you are registering for shared with other devices? Check
/proc/interrupts and lspci -v. If yes, resolve that conflict.

If not, add printk to your IRQ handler, redirect the kernel messages to
a serial console and try to find out how far and how ofter you get into
the handler.

Well, and then there is the option of source-level debugging. kgdb for
I-pipe patches aren't merged yet, but more convenient is KVM-based
debugging anyway. See [1] for the concept. Just requires VT-d or AMD
IOMMU on your target.

Jan

PS: Still no kernel coding style. Specifically the long lines makes it
hard to read.

[1]
http://chemnitzer.linux-tage.de/2012/vortraege/folien/1061-VirtualDebugging.pdf

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