[PATCH] powerpc/85xx: Add machine check handler to fix PCIe erratum on mpc85xx

[Jia Hongtao-B38951]

> -----Original Message-----
> From: linuxppc-dev-bounces+b38951=freescale.com at lists.ozlabs.org
> [mailto:linuxppc-dev-bounces+b38951=freescale.com at lists.ozlabs.org] On
> Behalf Of Kumar Gala
> Sent: Saturday, March 17, 2012 5:04 AM
> To: <shuo.liu at freesacle.com>
> Cc: Zhao Chenhui-B35336; Liu Shuo-B35362; Zang Roy-R61911; Liu Shuo-
> B35362; Wood Scott-B07421; linuxppc-dev at lists.ozlabs.org
> Subject: Re: [PATCH] powerpc/85xx: Add machine check handler to fix PCIe
> erratum on mpc85xx
> 
> 
> On Feb 10, 2012, at 2:09 AM, <shuo.liu at freesacle.com>
> <shuo.liu at freesacle.com> wrote:
> 
> > From: Liu Shuo <shuo.liu at freescale.com>
> >
> > A PCIe erratum of mpc85xx may causes a core hang when a link of PCIe
> > goes down. when the link goes down, Non-posted transactions issued
> > via the ATMU requiring completion result in an instruction stall.
> > At the same time a machine-check exception is generated to the core
> > to allow further processing by the handler. We implements the handler
> > which skips the instruction caused the stall.
> >
> > Signed-off-by: Zhao Chenhui <b35336 at freescale.com>
> > Signed-off-by: Li Yang <leoli at freescale.com>
> > Signed-off-by: Liu Shuo <b35362 at freescale.com>
> > ---
> > arch/powerpc/kernel/cpu_setup_fsl_booke.S |    2 +-
> > arch/powerpc/kernel/traps.c               |    3 ++
> > arch/powerpc/sysdev/fsl_pci.c             |   36
> +++++++++++++++++++++++++++++
> > arch/powerpc/sysdev/fsl_pci.h             |    6 +++++
> > 4 files changed, 46 insertions(+), 1 deletions(-)
> 
> Should we have a check to make sure the hose is for PCIe and not PCI?
> 
> - k

Due to errata spec pcie check is necessary.
I will send a new version of this patch to solve this problem soon.

Thanks.

Btw, from now on I will follow this patch instead of Liu Shuo.
- Jia Hongtao.