Re: [PATCH] arm64: Add workaround for Cavium erratum 27456

[David Daney]

On 02/09/2016 11:52 AM, Marc Zyngier wrote:
> On Tue,  9 Feb 2016 11:29:16 -0800
> David Daney <ddaney.cavm@xxxxxxxxx> wrote:
>
> Hi David,
>
> > From: Andrew Pinski <apinski@xxxxxxxxxx>
> >
> > On ThunderX T88 pass 1.x through 2.1 parts, broadcast TLBI
> > instructions may cause the icache to become invalid if it contains
> > data for a non-current ASID.
> >
> > This patch implements the workaround (which flushes the local icache
> > when switching the mm) by using code patching.
> >
> > Signed-off-by: Andrew Pinski <apinski@xxxxxxxxxx>
> > Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
> > ---
> >   arch/arm64/Kconfig                  | 11 +++++++++++
> >   arch/arm64/include/asm/cpufeature.h |  3 ++-
> >   arch/arm64/kernel/cpu_errata.c      |  9 +++++++++
> >   arch/arm64/mm/proc.S                | 12 ++++++++++++
> >   4 files changed, 34 insertions(+), 1 deletion(-)
>
> It would be good to update Documentation/arm64/silicon-errata.txt to
> reflect the fact that there is a workaround available for this erratum.

Would you prefer a separate patch for that, or should I roll it into 
this one and resubmit?

David Daney


> Thanks,
>
> 	M.