From b5895f86da1ad0526615bd1b64b2d42537cbcaf1 Mon Sep 17 00:00:00 2001
From: Michael Neuling <mikey@neuling.org>
Date: Tue, 27 Mar 2018 15:37:23 +1100
Subject: [PATCH 7/9] powerpc: Disable DAWR on POWER9 via CPU feature quirk
References: bsc#1055117
Patch-mainline: v4.17-rc1
Git-commit: 622aa35e8f6a077f034fe4ad053b6a2e9d278414
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 <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/kernel/dt_cpu_ftrs.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c
index 34f8b4c33c60..4313ff07edca 100644
--- a/arch/powerpc/kernel/dt_cpu_ftrs.c
+++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
@@ -714,8 +714,10 @@ static __init void cpufeatures_cpu_quirks(void)
cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_HV_ASSIST |
CPU_FTR_P9_TM_XER_SO_BUG;
- if ((version & 0xffff0000) == 0x004e0000)
+ if ((version & 0xffff0000) == 0x004e0000) {
+ cur_cpu_spec->cpu_features &= ~(CPU_FTR_DAWR);
cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_BUG;
+ }
}
static void __init cpufeatures_setup_finished(void)
--
2.13.6