[PATCH 3/3] powerpc/mm: Fixup tlbie vs store ordering issue on POWER9

[Michael Ellerman]

"Aneesh Kumar K.V" <aneesh.kumar at linux.vnet.ibm.com> writes:
> diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
> index a2c5c95882cf..6c151d2e9bd9 100644
> --- a/arch/powerpc/include/asm/cputable.h
> +++ b/arch/powerpc/include/asm/cputable.h
> @@ -465,7 +466,7 @@ static inline void cpu_feature_keys_init(void) { }
>  	    CPU_FTR_CFAR | CPU_FTR_HVMODE | CPU_FTR_VMX_COPY | \
>  	    CPU_FTR_DBELL | CPU_FTR_HAS_PPR | CPU_FTR_DAWR | \
>  	    CPU_FTR_ARCH_207S | CPU_FTR_TM_COMP | CPU_FTR_ARCH_300 | \
> -	    CPU_FTR_PKEY)
> +	    CPU_FTR_PKEY | CPU_FTR_TLBIE_BUG)

We also need to enable this when we're using DT_CPU_FTRS.

We're still working out the best way to handle that sort of thing long
term, for now I'll just fold in a quirk that turns this feature on for
all Power9 revisions. We can do a follow-up patch to make that
conditional later.

diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c
index 0bcfb0f256e1..553514cd6c27 100644
--- a/arch/powerpc/kernel/dt_cpu_ftrs.c
+++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
@@ -709,6 +709,9 @@ static __init void cpufeatures_cpu_quirks(void)
 		cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD1;
 	else if ((version & 0xffffefff) == 0x004e0201)
 		cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
+
+	if ((version & 0xffff0000) == 0x004e0000)
+		cur_cpu_spec->cpu_features |= CPU_FTR_TLBIE_BUG;
 }
 

cheers