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| author | Michael Neuling <mikey@neuling.org> | 2018-03-27 07:37:23 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-03-27 15:55:33 +0300 |
| commit | 622aa35e8f6a077f034fe4ad053b6a2e9d278414 (patch) | |
| tree | 9a42e7a822ce606312770571a3bbaf7f41e8186b | |
| parent | b53221e7042764d7456933d47a83b31372ce9dac (diff) | |
| download | linux-622aa35e8f6a077f034fe4ad053b6a2e9d278414.tar.xz | |
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>
| -rw-r--r-- | arch/powerpc/kernel/dt_cpu_ftrs.c | 3 |
1 files changed, 3 insertions, 0 deletions
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) |