[Xenomai] [help] porting I-pipe patch on linux-3.4 ARM(cortex-a7) soc

[xielinfei <xielinfei@allwinnertech.com>]

Hi Philippe,

      I try to port Xenomai-2.6.2 to ARM (cortex-a7) soc, Using:
      Linux version: linux-3.4.39
      I-pipe patch:  ipipe-core-3.4.6-arm-4.patch
      Hardware: ARM (cortex-a7) single CPU
      Following the guild: Porting Xenomai dual kernel to a new ARM SoC - Xenomai<https://www.google.com.hk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwiC5a-r8cfOAhWJRI8KHatQC_cQFggmMAE&url=https%3A%2F%2Fxenomai.org%2F2014%2F09%2Fporting-xenomai-dual-kernel-to-a-new-arm-soc%2F&usg=AFQjCNF7_SLahZ2bEmhJokUuxzy44eH10A&sig2=zgLgf_uma3eALRUl5S9v3A&bvm=bv.129759880,d.dGo>

      For I-pipe patch, I modified <ipipe_tsc.c> and <ipipe_tsc_asm.S> to add support for "IPIPE_TSC_TYPE_FREERUNNING_ARCH"
       (I have successfully running on linux-3.10 on the same ARM soc)

      After integrate I-pipe patch(without Xenomai), the kernel running for a while then halt, "__ipipe_tsc_update()" not update any more.
      I trace the code, the timer IRQ is always got by the gic controller, but ipipe not dispatch. the call trace is :
      __ipipe_grab_irq()--> __ipipe_dispatch_irq() --> __ipipe_sync_pipeline()

     static inline void __ipipe_sync_pipeline(struct ipipe_domain *top, unsigned int irq)
     {
               if (__ipipe_current_domain != top) {
                   __ipipe_do_sync_pipeline(top);
                   return;
              }
              if (!test_bit(IPIPE_STALL_FLAG, &ipipe_this_cpu_context(top)->status)){
                  __ipipe_sync_stage();
              }
     }

     While halt,  the __ipipe_sync_pipeline will do nothing, if I hack it, force it calling "__ipipe_sync_stage"
     the kernel can goes on, but this should not be the solution.
     I don't know who set the IPIPE_STALL_FLAG, for I trace the code  it seems to be ok,
     -------------------------------------------------------------------------------------------
     fun:ipipe_unstall_root,clear
     fun:__ipipe_dispatch_irq, line=1279, control=1, name =Linux
     fun:__ipipe_dispatch_irq, line=1285
     fun:__ipipe_spin_lock_irqsave,test and set
     fun:__ipipe_spin_unlock_irqrestore,clear
     fun:__ipipe_dispatch_irq, line=1319
     fun:__ipipe_spin_lock_irqsave,test and set
     fun:ipipe_unstall_root,clear
     fun:ipipe_unstall_root,clear
     fun:ipipe_unstall_root,clear
     fun:__ipipe_dispatch_irq, line=1279, control=1, name =Linux
     fun:__ipipe_dispatch_irq, line=1285
     fun:__ipipe_spin_lock_irqsave,test and set
     fun:__ipipe_spin_unlock_irqrestore,clear
     fun:__ipipe_dispatch_irq, line=1319
     fun:__ipipe_spin_lock_irqsave,test and set
     fun:ipipe_unstall_root,clear
     fun:ipipe_unstall_root,clear
     fun:ipipe_unstall_root,clear
    ------------------------------------------------------------------------------------------

    Looking forward to get some suggestion!   thank you!










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