[PATCH 2/3 v2] LEON3 SMP: support static interrupt affinity

[Daniel Hellstrom]

On 10/09/2014 11:13 AM, Sebastian Huber wrote:
> On 08/10/14 15:49, Daniel Hellstrom wrote:
>> +#ifdef RTEMS_SMP
>> +/* Weak table used to implement static interrupt CPU affinity in a SMP
>> + * configuration. The array index is the interrupt to be looked up, and
>> + * the array[INTERRUPT] content is the CPU number relative to boot CPU
>> + * index that will be servicing the interrupts from the IRQ source. The
>> + * default is to let the first CPU (the boot cpu) to handle all
>> + * interrupts (all zeros).
>> + */
>> +extern unsigned char sparc_irq_to_cpu[32];
>> +#endif
>
> I am not so fond of adding BSP specific solutions to deal with the interrupt processor affinity.
>
> I would rather enhance the interrupt manager extension API:
>
> http://www.rtems.org/wiki/index.php?title=SMP#Interrupt_Support_2
>
> http://www.rtems.org/onlinedocs/doxygen/cpukit/html/group__rtems__interrupt__extension.html

I see this as a first step for the BSP to support Interrupt affinity. The rtems_interrupt_{set,get}_affinity() will change the default IRQ2CPU mapping and move already installed interrupts to a 
specific CPU set. With this patch the default mapping does not have to route all IRQs to CPU0 from the start.

Daniel