From 622aa35e8f6a077f034fe4ad053b6a2e9d278414 Mon Sep 17 00:00:00 2001 From: Michael Neuling Date: Tue, 27 Mar 2018 15:37:23 +1100 Subject: [PATCH] powerpc: Disable DAWR on POWER9 via CPU feature quirk This disables the DAWR on all POWER9 CPUs via cpu feature quirk. Using the DAWR on POWER9 can cause xstops, hence we need to disable it. Signed-off-by: Michael Neuling Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/dt_cpu_ftrs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c index 0a0c601c6ade..0af2c5dc5162 100644 --- a/arch/powerpc/kernel/dt_cpu_ftrs.c +++ b/arch/powerpc/kernel/dt_cpu_ftrs.c @@ -713,6 +713,9 @@ static __init void cpufeatures_cpu_quirks(void) else if ((version & 0xffffefff) == 0x004e0202) cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_HV_ASSIST | CPU_FTR_P9_TM_XER_SO_BUG; + + if ((version & 0xffff0000) == 0x004e0000) + cur_cpu_spec->cpu_features &= ~(CPU_FTR_DAWR); } static void __init cpufeatures_setup_finished(void) -- 2.30.2