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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 <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Neuling 2018-03-27 15:37:23 +11:00 committed by Michael Ellerman
parent b53221e704
commit 622aa35e8f
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/kernel/dt_cpu_ftrs.c
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@ -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)