ARM: tlb: don't perform inner-shareable invalidation for local BP ops
Now that the ASID allocator doesn't require inner-shareable maintenance,
we can convert the local_bp_flush_all function to perform only
non-shareable flushing, in a similar manner to the TLB invalidation
routines.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
diff --git a/arch/arm/include/asm/tlbflush.h b/arch/arm/include/asm/tlbflush.h
index 9b725d2..8471824 100644
--- a/arch/arm/include/asm/tlbflush.h
+++ b/arch/arm/include/asm/tlbflush.h
@@ -531,15 +531,33 @@
* Branch predictor maintenance is paired with full TLB invalidation, so
* there is no need for any barriers here.
*/
+static inline void __local_flush_bp_all(void)
+{
+ const int zero = 0;
+ const unsigned int __tlb_flag = __cpu_tlb_flags;
+
+ if (tlb_flag(TLB_V6_BP))
+ asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero));
+}
+
static inline void local_flush_bp_all(void)
{
const int zero = 0;
const unsigned int __tlb_flag = __cpu_tlb_flags;
+ __local_flush_bp_all();
+ if (tlb_flag(TLB_V7_UIS_BP))
+ asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero));
+}
+
+static inline void __flush_bp_all(void)
+{
+ const int zero = 0;
+ const unsigned int __tlb_flag = __cpu_tlb_flags;
+
+ __local_flush_bp_all();
if (tlb_flag(TLB_V7_UIS_BP))
asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero));
- else if (tlb_flag(TLB_V6_BP))
- asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero));
}
#include <asm/cputype.h>
diff --git a/arch/arm/kernel/smp_tlb.c b/arch/arm/kernel/smp_tlb.c
index 5883b8a..83ccca3 100644
--- a/arch/arm/kernel/smp_tlb.c
+++ b/arch/arm/kernel/smp_tlb.c
@@ -173,5 +173,5 @@
if (tlb_ops_need_broadcast())
on_each_cpu(ipi_flush_bp_all, NULL, 1);
else
- local_flush_bp_all();
+ __flush_bp_all();
}