Re: [PATCH v2 1/7] powerpc: Add new HWCAP bits

[Michael Neuling <mikey@neuling.org>]

On Tue, 2020-05-19 at 10:31 +1000, Alistair Popple wrote:
> POWER10 introduces two new architectural features - ISAv3.1 and matrix
> multiply accumulate (MMA) instructions. Userspace detects the presence
> of these features via two HWCAP bits introduced in this patch. These
> bits have been agreed to by the compiler and binutils team.
> 
> Signed-off-by: Alistair Popple <alistair@popple.id.au>

I've test booted this series + powerpc/next (30df74d67d) on top of powervm and
OPAL on a P10 simulator.

In both cases, it enables MMA and prefix instructions and advertises them via
HWCAP2 MMA + ISA 3.1. Hence:

Tested-by: Michael Neuling <mikey@neuling.org>

> ---
>  arch/powerpc/include/uapi/asm/cputable.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/powerpc/include/uapi/asm/cputable.h
> b/arch/powerpc/include/uapi/asm/cputable.h
> index 540592034740..2692a56bf20b 100644
> --- a/arch/powerpc/include/uapi/asm/cputable.h
> +++ b/arch/powerpc/include/uapi/asm/cputable.h
> @@ -50,6 +50,8 @@
>  #define PPC_FEATURE2_DARN		0x00200000 /* darn random number insn */
>  #define PPC_FEATURE2_SCV		0x00100000 /* scv syscall */
>  #define PPC_FEATURE2_HTM_NO_SUSPEND	0x00080000 /* TM w/out suspended state
> */
> +#define PPC_FEATURE2_ARCH_3_1		0x00040000 /* ISA 3.1 */
> +#define PPC_FEATURE2_MMA		0x00020000 /* Matrix Multiply Accumulate
> */
>  
>  /*
>   * IMPORTANT!