linux-kernel - Re: [PATCH 10/10] ARC: [plat-eznps] Handle memory error as an exception

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Date:   Thu, 25 May 2017 11:30:59 +0000
From:   Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:     "noamca@...lanox.com" <noamca@...lanox.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "eladkan@...lanox.com" <eladkan@...lanox.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH 10/10] ARC: [plat-eznps] Handle memory error as an
 exception

Hi Noam,

On Thu, 2017-05-25 at 11:26 +0000, Noam Camus wrote:
> > 
> > From: Alexey Brodkin [mailto:Alexey.Brodkin@...opsys.com] 
> > Sent: Thursday, May 25, 2017 14:15 PM
> 
> > 
> > > 
> > > 
> > > diff --git a/arch/arc/kernel/entry-compact.S 
> > > b/arch/arc/kernel/entry-compact.S index f285dbb..d152d36 100644
> > > --- a/arch/arc/kernel/entry-compact.S
> > > +++ b/arch/arc/kernel/entry-compact.S
> > > @@ -203,6 +203,17 @@ END(handle_interrupt_level2)
> > >  ; ---------------------------------------------
> > >  ENTRY(mem_service)
> > >  
> > > +#if defined(CONFIG_EZNPS_MEM_ERROR)
> > > +        ; SW workaround to cover up on a difference between
> > > +        ; NPS real chip and simulator behaviors.
> > > +        ; NPS real chip will activate a machine check exception
> > > +        ; in case of memory error, while the simulator will
> > > +        ; trigger a level 2 interrupt. Therefor this code section
> > > +        ; should be reached only in simulation mode.
> > > +        ; DEAD END: display Regs and HALT
> 
> > 
> > I'm not really buying that.
> 
> > 
> > Why don't you just make simulator behaving exactly as your real chip?
> I can't change simulator core behavior. nSIM is a Synopsys proprietary code.

Well probably it worth discussing with nSIM team if they may have any suggestions
on how to align nSIM behavior with your real HW?

-Alexey