tree af6428140af2760616d577a0b1e515a45b58207c
parent c109f42450ec25283169dd6c0acce8d053493732
author Guo Ren <guoren@linux.alibaba.com> 1608789597 +0000
committer Guo Ren <guoren@linux.alibaba.com> 1610416361 +0800

csky: Fix TLB maintenance synchronization problem

TLB invalidate didn't contain a barrier operation in csky cpu and
we need to prevent previous PTW response after TLB invalidation
instruction. Of cause, the ASID changing also needs to take care
of the issue.

CPU0                    CPU1
===============         ===============
set_pte
sync_is()        ->     See the previous set_pte for all harts
tlbi.vas         ->     Invalidate all harts TLB entry & flush pipeline

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>