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powerpc: Disable DAWR on POWER9 via CPU feature quirk

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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)