[ARM] armv7: add support for asid-tagged VIVT I-cache

ARMv7 can have VIPT, PIPT or ASID-tagged VIVT I-cache. This patch
adds the necessary invalidation of the I-cache when the ASID numbers
are re-used.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/arm/mm/context.c b/arch/arm/mm/context.c
index 9da43a0fdcdf..c9e9a5586267 100644
--- a/arch/arm/mm/context.c
+++ b/arch/arm/mm/context.c
@@ -47,6 +47,13 @@ void __new_context(struct mm_struct *mm)
                     : "r" (0));
                 isb();
                 flush_tlb_all();
+                if (icache_is_vivt_asid_tagged()) {
+                        asm("mcr        p15, 0, %0, c7, c5, 0   @ invalidate I-cache\n"
+                            "mcr        p15, 0, %0, c7, c5, 6   @ flush BTAC/BTB\n"
+                            :
+                            : "r" (0));
+                        dsb();
+                }
         }
 
         mm->context.id = asid;