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| author | Nicholas Piggin <npiggin@gmail.com> | 2018-08-27 13:03:01 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-10-04 23:16:53 +1000 |
| commit | bc276ecba132caccb1fda5863a652c15def2b8c6 (patch) | |
| tree | aa70ce5777f7ef89c1a0086ed3d373fb83945a01 /arch/powerpc/kernel/mce_power.c | |
| parent | 817593604e5b244dc55344d298d96122457c20bd (diff) | |
| download | linux-bc276ecba132caccb1fda5863a652c15def2b8c6.tar.bz2 | |
powerpc/64s/hash: Do not use PPC_INVALIDATE_ERAT on CPUs before POWER9
PPC_INVALIDATE_ERAT is slbia IH=7 which is a new variant introduced
with POWER9, and the result is undefined on earlier CPUs.
Commits 7b9f71f974 ("powerpc/64s: POWER9 machine check handler") and
d4748276ae ("powerpc/64s: Improve local TLB flush for boot and MCE on
POWER9") caused POWER7/8 code to use this instruction. Remove it. An
ERAT flush can be made by invalidatig the SLB, but before POWER9 that
requires a flush and rebolt.
Fixes: 7b9f71f974 ("powerpc/64s: POWER9 machine check handler")
Fixes: d4748276ae ("powerpc/64s: Improve local TLB flush for boot and MCE on POWER9")
Cc: stable@vger.kernel.org # v4.11+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/mce_power.c')
| -rw-r--r-- | arch/powerpc/kernel/mce_power.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel/mce_power.c index 2016b58d564f..6b800eec31f2 100644 --- a/arch/powerpc/kernel/mce_power.c +++ b/arch/powerpc/kernel/mce_power.c @@ -89,6 +89,13 @@ void flush_and_reload_slb(void) static void flush_erat(void) { +#ifdef CONFIG_PPC_BOOK3S_64 + if (!early_cpu_has_feature(CPU_FTR_ARCH_300)) { + flush_and_reload_slb(); + return; + } +#endif + /* PPC_INVALIDATE_ERAT can only be used on ISA v3 and newer */ asm volatile(PPC_INVALIDATE_ERAT : : :"memory"); } |