linux-kernel - Re: [PATCH 2/2] powerpc: Print esr register when hitting Program Interrupt

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Date:   Sat, 24 Apr 2021 21:51:28 +0800
From:   Xiongwei Song <sxwjean@...il.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Xiongwei Song <sxwjean@...com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, npiggin@...il.com,
        ravi.bangoria@...ux.ibm.com, mikey@...ling.org,
        aneesh.kumar@...ux.ibm.com, 0x7f454c46@...il.com,
        PowerPC <linuxppc-dev@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] powerpc: Print esr register when hitting Program Interrupt

On Thu, Apr 22, 2021 at 11:29 PM Christophe Leroy
<christophe.leroy@...roup.eu> wrote:
>
>
>
> Le 22/04/2021 à 17:10, Xiongwei Song a écrit :
> > From: Xiongwei Song <sxwjean@...il.com>
> >
> > The esr register has the details of Program Interrupt on BookE/4xx cpus,
> > printing its value is helpful.
> >
> > Signed-off-by: Xiongwei Song <sxwjean@...il.com>
> > ---
> >   arch/powerpc/kernel/process.c | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
> > index 5c3830837f3a..664aecf8ee2e 100644
> > --- a/arch/powerpc/kernel/process.c
> > +++ b/arch/powerpc/kernel/process.c
> > @@ -1459,6 +1459,7 @@ static bool interrupt_detail_printable(int trap)
> >       case INTERRUPT_MACHINE_CHECK:
> >       case INTERRUPT_DATA_STORAGE:
> >       case INTERRUPT_ALIGNMENT:
> > +     case INTERRUPT_PROGRAM:
>
> With this, it will also print the DSISR on 8xx/6xx so it will print garbage.
>
> 8xx/6xx provide the information in SRR1. If you want to proceed, you have to do the same as in ISI:
> Copy the content of SRR1 into regs->dsisr in the assembly handler in head_book3s_32.S and in the
> instruction TLB error handler in head_8xx.S

Good point.