powerpc: Add new HWCAP bits

POWER10 introduces two new architectural features - ISAv3.1 and matrix
multiply assist (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.

According to ISAv3.1 MMA is an optional feature and software that makes
use of it should first check for availability via this HWCAP bit and use
alternate code paths if unavailable.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Tested-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200521014341.29095-2-alistair@popple.id.au

diff --git a/arch/powerpc/include/uapi/asm/cputable.h b/arch/powerpc/include/uapi/asm/cputable.h
index 5405920..731b97d 100644 (file)
--- 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 Assist */
 
 /*
  * IMPORTANT!