[PATCH 3.14 19/77] powerpc/book3s: Fix partial invalidation of TLBs in MCE code.

From: Greg Kroah-Hartman
Date: Wed Jan 14 2015 - 02:35:39 EST


3.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Mahesh Salgaonkar <mahesh@xxxxxxxxxxxxxxxxxx>

commit 682e77c861c4c60f79ffbeae5e1938ffed24a575 upstream.

The existing MCE code calls flush_tlb hook with IS=0 (single page) resulting
in partial invalidation of TLBs which is not right. This patch fixes
that by passing IS=0xc00 to invalidate whole TLB for successful recovery
from TLB and ERAT errors.

Signed-off-by: Mahesh Salgaonkar <mahesh@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
arch/powerpc/kernel/mce_power.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/powerpc/kernel/mce_power.c
+++ b/arch/powerpc/kernel/mce_power.c
@@ -78,7 +78,7 @@ static long mce_handle_derror(uint64_t d
}
if (dsisr & P7_DSISR_MC_TLB_MULTIHIT_MFTLB) {
if (cur_cpu_spec && cur_cpu_spec->flush_tlb)
- cur_cpu_spec->flush_tlb(TLBIEL_INVAL_PAGE);
+ cur_cpu_spec->flush_tlb(TLBIEL_INVAL_SET);
/* reset error bits */
dsisr &= ~P7_DSISR_MC_TLB_MULTIHIT_MFTLB;
}
@@ -109,7 +109,7 @@ static long mce_handle_common_ierror(uin
break;
case P7_SRR1_MC_IFETCH_TLB_MULTIHIT:
if (cur_cpu_spec && cur_cpu_spec->flush_tlb) {
- cur_cpu_spec->flush_tlb(TLBIEL_INVAL_PAGE);
+ cur_cpu_spec->flush_tlb(TLBIEL_INVAL_SET);
handled = 1;
}
break;


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