powerpc/64s/hash: avoid the POWER5 < DD2.1 slb invalidate workaround on POWER8/9

I only have POWER8/9 to test, so just remove it for those.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 2206912..77a888b 100644 (file)
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -672,7 +672,9 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT)
 
        isync
        slbie   r6
+BEGIN_FTR_SECTION
        slbie   r6              /* Workaround POWER5 < DD2.1 issue */
+END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
        slbmte  r7,r0
        isync
 2:

diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
index 07ece01..0656d20 100644 (file)
--- a/arch/powerpc/mm/slb.c
+++ b/arch/powerpc/mm/slb.c
@@ -326,9 +326,11 @@ void switch_slb(struct task_struct *tsk, struct mm_struct *mm)
                __slb_flush_and_rebolt();
        }
 
-       /* Workaround POWER5 < DD2.1 issue */
-       if (offset == 1 || offset > SLB_CACHE_ENTRIES)
-               asm volatile("slbie %0" : : "r" (slbie_data));
+       if (!cpu_has_feature(CPU_FTR_ARCH_207S)) {
+               /* Workaround POWER5 < DD2.1 issue */
+               if (offset == 1 || offset > SLB_CACHE_ENTRIES)
+                       asm volatile("slbie %0" : : "r" (slbie_data));
+       }
 
        get_paca()->slb_cache_ptr = 0;
        copy_mm_to_paca(mm);