SMP support for Raspberry Pi 2

[Rohini Kulkarni]

Hi,

I am stuck at how to set up IPI for Pi 2. This
<https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2836/QA7_rev3.4.pdf>
is a document I have referred to get an idea of interrupts. Would be great
to get some help on how to proceed.

On Fri, Jul 31, 2015 at 7:33 PM, Joel Sherrill <joel.sherrill at oarcorp.com>
wrote:

>
>
> On 7/31/2015 8:11 AM, Rohini Kulkarni wrote:
>
>> Hi,
>>
>> How is the number of processors to be used for an application specified?
>> The used count minimum of that supported in hardware and that configured.
>> How to specify the latter?
>>
>
>
> https://docs.rtems.org/doc-current/share/rtems/html/c_user/Configuring-a-System-SMP-Specific-Configuration-Parameters.html#Configuring-a-System-SMP-Specific-Configuration-Parameters
>
> and see the smptests. Many of which do specify the maximum.
>
> Thanks.
>>
>> On 29 Jul 2015 15:29, "Sebastian Huber" <
>> sebastian.huber at embedded-brains.de <mailto:
>> sebastian.huber at embedded-brains.de>> wrote:
>>
>>
>>
>>     On 29/07/15 11:52, Rohini Kulkarni wrote:
>>
>>
>>
>>         On Tue, Jul 28, 2015 at 12:24 PM, Sebastian Huber <
>> sebastian.huber at embedded-brains.de <mailto:
>> sebastian.huber at embedded-brains.de> <mailto:
>> sebastian.huber at embedded-brains.de <mailto:
>> sebastian.huber at embedded-brains.de>>> wrote:
>>
>>              Hello Rohini,
>>
>>              please use the devel list.
>>
>>              On 28/07/15 07:41, Rohini Kulkarni wrote:
>>
>>                  Hi,
>>
>>                  I wish to understand where the interprocessor interrupts
>> are
>>                  used during the boot process. During final
>> initialization of
>>                  SMP I can see
>>
>>                  rtems_interrupt_handler_install(
>>                        ARM_GIC_IRQ_SGI_0,
>>                        "IPI",
>>                        RTEMS_INTERRUPT_UNIQUE,
>>                        bsp_inter_processor_interrupt,
>>                        NULL
>>                      );
>>
>>                  Raspberry Pi 2 does not have the generic interrupt
>> controller.
>>                  Interrupt routing will have to be handled differently.
>> So I
>>                  wish to understand how/ where it is used. I suppose this
>> might
>>                  be the problem.
>>
>>
>>              Sorry, that the documentation is so scattered.  I think we
>> should
>>              move everything into the CPU Architecture Supplement. It
>> would be
>>              nice if you can help to improve the documentation since you
>> have a
>>              different view point.
>>
>>              You must install the IPI during the system initialization.
>> It is
>>              raised via the _CPU_SMP_Send_interrupt() function, for an
>> example
>>              see arm-a9mpcore-smp.c.
>>
>>         I could locate the function in  arm-a9mpcore-smp.c. but it would
>> be helpful if I can know where this being called from, a deeper call
>> hierarchy, so that I can ascertain this is a problem. I can see a
>> Send_messgae function call this. But don't know where the send message is
>> being called from.
>>
>>
>>     You can run one of the SMP tests on the realview_pbx_a9_qemu_smp BSP
>> on Qemu and set a break point to _CPU_SMP_Send_interrupt() if you want to
>> know how it is used.
>>
>>     --
>>     Sebastian Huber, embedded brains GmbH
>>
>>     Address : Dornierstr. 4, D-82178 Puchheim, Germany
>>     Phone   : +49 89 189 47 41-16
>>     Fax     : +49 89 189 47 41-09
>>     E-Mail  : sebastian.huber at embedded-brains.de <mailto:
>> sebastian.huber at embedded-brains.de>
>>     PGP     : Public key available on request.
>>
>>     Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
>>
>>
> --
> Joel Sherrill, Ph.D.             Director of Research & Development
> joel.sherrill at OARcorp.com        On-Line Applications Research
> Ask me about RTEMS: a free RTOS  Huntsville AL 35805
> Support Available                (256) 722-9985
>



-- 
Rohini Kulkarni
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