On Tue, 2019-08-06 at 13:34 +0100, Mark Rutland wrote:
> On Tue, Aug 06, 2019 at 07:29:48PM +0800, Miles Chen wrote:
> > This change prints the hexadecimal EC value in mem_abort_decode(),
> > which makes it easier to lookup the corresponding EC in
> > the ARM Architecture Reference Manual.
> >
> > The commit 1f9b8936f36f ("arm64: Decode information from ESR upon mem
> > faults") prints useful information when memory abort occurs. It would
> > be easier to lookup "0x25" instead of "DABT" in the document. Then we
> > can check the corresponding ISS.
> >
> > For example:
> > Current info Document
> > EC Exception class
> > "CP15 MCR/MRC" 0x3 "MCR or MRC access to CP15a..."
> > "ASIMD" 0x7 "Access to SIMD or floating-point..."
> > "DABT (current EL)" 0x25 "Data Abort taken without..."
> > ...
> >
> > Before:
> > Unable to handle kernel paging request at virtual address 000000000000c000
> > Mem abort info:
> > ESR = 0x96000046
> > Exception class = DABT (current EL), IL = 32 bits
> > SET = 0, FnV = 0
> > EA = 0, S1PTW = 0
> > Data abort info:
> > ISV = 0, ISS = 0x00000046
> > CM = 0, WnR = 1
> >
> > After:
> > Unable to handle kernel paging request at virtual address 000000000000c000
> > Mem abort info:
> > ESR = 0x96000046
> > EC = 0x25, Exception class = DABT (current EL), IL = 32 bits
> > SET = 0, FnV = 0
> > EA = 0, S1PTW = 0
> > Data abort info:
> > ISV = 0, ISS = 0x00000046
> > CM = 0, WnR = 1
> >
> > Cc: Mark Rutland <mark.rutl...@arm.com>
> > Cc: Anshuman Khandual <anshuman.khand...@arm.com>
> > Cc: James Morse <james.mo...@arm.com>
> > Signed-off-by: Miles Chen <miles.c...@mediatek.com>
> > ---
> > arch/arm64/mm/fault.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> > index cfd65b63f36f..afb6041e25e6 100644
> > --- a/arch/arm64/mm/fault.c
> > +++ b/arch/arm64/mm/fault.c
> > @@ -86,8 +86,8 @@ static void mem_abort_decode(unsigned int esr)
> > pr_alert("Mem abort info:\n");
> >
> > pr_alert(" ESR = 0x%08x\n", esr);
> > - pr_alert(" Exception class = %s, IL = %u bits\n",
> > - esr_get_class_string(esr),
> > + pr_alert(" EC = 0x%lx, Exception class = %s, IL = %u bits\n",
> > + ESR_ELx_EC(esr), esr_get_class_string(esr),
>
> Could we make this:
>
> pr_alert(" EC = 0x%02lx: %s, IL = %u bits\n",
> ESR_ELx_EC(esr), esr_get_class_string(esr));
>
> We don't need to spell out "Exception Class" if we say "EC", and we
> should print the EC hex value with a consistent width as we do for the
> ISS.
Thanks for the advise.
It looks better this way. I'll send patch v2.
Miles
>
> With that:
>
> Acked-by: Mark Rutland <mark.rutl...@arm.com>
>
> Thanks,
> Mark.
