L4Linux update? Driver support

Adam Lackorzynski adam at os.inf.tu-dresden.de
Sat Nov 28 00:31:12 CET 2015


On Wed Nov 25, 2015 at 22:19:01 +0800, li94575 wrote:
> At 2015-11-25 05:05:20, "Adam Lackorzynski" <adam at os.inf.tu-dresden.de> wrote:
> >On Mon Nov 23, 2015 at 22:09:47 +0800, li94575 wrote:
> >> At 2015-11-22 23:42:55, "Adam Lackorzynski" <adam at os.inf.tu-dresden.de> wrote:
> >> >hi,
> >> >
> >> >The l4lx_irq_dev_set_affinity function that is called by Linux
> >> >interrupt code, i.e. I think all the book keeping shall be done by the
> >> >Linux code, including the output of /proc/interrupts.
> >> >You should check in the jdb to which thread the interrupt is attached.
> >> >You can see this in the object list, use shift-Q to see it.
> >> >WIth CONFIG_L4_DEBUG_REGISTER_NAMES=y enabled in L4Linux, you'll have
> >> >proper descriptions of the objects, so you'll find the interrupt you're
> >> >looking for: l4lx.irqXX with XX being the same number as in
> >> >/proc/interrupts. 
> >> >Then, look for the T= value of that particular interrupt, it points to
> >> >the thread the interrupt is attached to. Pressing TAB brings you to the
> >> >thread in the list. Is it the right onw?
> 
> >> >I have tried your methed in the jdb, and find all the irqs we used is on the same thread( on cpu0 ) which 
> has no name.But CONFIG_L4_DEBUG_REGISTER_NAMES is enabled in L4Linux. Regardless of how the 
> irq setting in L4Linux, it always stays the same in the jdb, this makes me so confused.
> >
> >When setting the affinity, does it use the proper new CPU number in
> >attach_to_irq? Also change the dd_printk to printk to see whether the
> >attach might go wrong (also do this in detach_from_interrupt). Any error
> >messages displayed now?
> 
> I have to remind you that the l4lxlib we used is provided by genode. It is a bit different from original version in L4Linux.
> The relevant source file is attached at the end. We can confirm that the new CPU number is right in irq_attach and both 
> system calls (irq_detach, irq_attach) have no error reports.

I can't see any obvious problem, so I can only suggest to debug this
further by looking at the cap-idx and see whether those are different
between the from and to cpu.




Adam
-- 
Adam                 adam at os.inf.tu-dresden.de
  Lackorzynski         http://os.inf.tu-dresden.de/~adam/



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