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 (file)
--- a/arch/arm/include/asm/tlbflush.h
+++ b/arch/arm/include/asm/tlbflush.h
@@ -531,17 +531,35 @@ static inline void __flush_tlb_kernel_page(unsigned long kaddr)
  * 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, c1, 6" : : "r" (zero));
-       else if (tlb_flag(TLB_V6_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));
+}
+
 #include <asm/cputype.h>
 #ifdef CONFIG_ARM_ERRATA_798181
 static inline int erratum_a15_798181(void)

diff --git a/arch/arm/kernel/smp_tlb.c b/arch/arm/kernel/smp_tlb.c
index 5883b8a..83ccca3 100644 (file)
--- a/arch/arm/kernel/smp_tlb.c
+++ b/arch/arm/kernel/smp_tlb.c
@@ -173,5 +173,5 @@ void flush_bp_all(void)
        if (tlb_ops_need_broadcast())
                on_each_cpu(ipi_flush_bp_all, NULL, 1);
        else
-               local_flush_bp_all();
+               __flush_bp_all();
 }