powerpc/64s: Fix DT CPU features Power9 DD2.1 logic

In the device tree CPU features quirk code we want to set
CPU_FTR_POWER9_DD2_1 on all Power9s that aren't DD2.0 or earlier. But
we got the logic wrong and instead set it on all CPUs that aren't
Power9 DD2.0 or earlier, ie. including Power8.

Fix it by making sure we're on a Power9. This isn't a bug in practice
because the only code that checks the feature is Power9 only to begin
with. But we'll backport it anyway to avoid confusion.

Fixes: 9e9626ed3a4a ("powerpc/64s: Fix POWER9 DD2.2 and above in DT CPU features")
Cc: stable@vger.kernel.org # v4.17+
Reported-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
 arch/powerpc/kernel/dt_cpu_ftrs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

On Wed, 13 Jun 2018 23:23:56 +1000
Michael Ellerman <mpe@ellerman.id.au> wrote:

> In the device tree CPU features quirk code we want to set
> CPU_FTR_POWER9_DD2_1 on all Power9s that aren't DD2.0 or earlier. But
> we got the logic wrong and instead set it on all CPUs that aren't
> Power9 DD2.0 or earlier, ie. including Power8.
> 
> Fix it by making sure we're on a Power9. This isn't a bug in practice
> because the only code that checks the feature is Power9 only to begin
> with. But we'll backport it anyway to avoid confusion.
> 
> Fixes: 9e9626ed3a4a ("powerpc/64s: Fix POWER9 DD2.2 and above in DT CPU features")
> Cc: stable@vger.kernel.org # v4.17+
> Reported-by: Paul Mackerras <paulus@samba.org>
> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

Acked-by: Nicholas Piggin <npiggin@gmail.com>

> ---
>  arch/powerpc/kernel/dt_cpu_ftrs.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c
> index 4be1c0de9406..96dd3d871986 100644
> --- a/arch/powerpc/kernel/dt_cpu_ftrs.c
> +++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
> @@ -711,7 +711,8 @@ static __init void cpufeatures_cpu_quirks(void)
>  		cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_HV_ASSIST;
>  		cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_XER_SO_BUG;
>  		cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
> -	} else /* DD2.1 and up have DD2_1 */
> +	} else if ((version & 0xffff0000) == 0x004e0000)
> +		/* DD2.1 and up have DD2_1 */
>  		cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
>  
>  	if ((version & 0xffff0000) == 0x004e0000) {

On Wed, 2018-06-13 at 13:23:56 UTC, Michael Ellerman wrote:
> In the device tree CPU features quirk code we want to set
> CPU_FTR_POWER9_DD2_1 on all Power9s that aren't DD2.0 or earlier. But
> we got the logic wrong and instead set it on all CPUs that aren't
> Power9 DD2.0 or earlier, ie. including Power8.
> 
> Fix it by making sure we're on a Power9. This isn't a bug in practice
> because the only code that checks the feature is Power9 only to begin
> with. But we'll backport it anyway to avoid confusion.
> 
> Fixes: 9e9626ed3a4a ("powerpc/64s: Fix POWER9 DD2.2 and above in DT CPU features")
> Cc: stable@vger.kernel.org # v4.17+
> Reported-by: Paul Mackerras <paulus@samba.org>
> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
> Acked-by: Nicholas Piggin <npiggin@gmail.com>

Applied to powerpc fixes.

https://git.kernel.org/powerpc/c/749a0278c2177b2d16da5d8b135ba7

cheers