linux-kernel - [RFC V1 1/7] x86: Probe assembler capabilities for VAES and VPLCMULQDQ support

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Message-Id: <1608325864-4033-2-git-send-email-megha.dey@intel.com>
Date:   Fri, 18 Dec 2020 13:10:58 -0800
From:   Megha Dey <megha.dey@...el.com>
To:     herbert@...dor.apana.org.au, davem@...emloft.net
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        ravi.v.shankar@...el.com, tim.c.chen@...el.com,
        andi.kleen@...el.com, dave.hansen@...el.com, megha.dey@...el.com,
        wajdi.k.feghali@...el.com, greg.b.tucker@...el.com,
        robert.a.kasten@...el.com, rajendrakumar.chinnaiyan@...el.com,
        tomasz.kantecki@...el.com, ryan.d.saffores@...el.com,
        ilya.albrekht@...el.com, kyung.min.park@...el.com,
        tony.luck@...el.com, ira.weiny@...el.com, x86@...nel.org
Subject: [RFC V1 1/7] x86: Probe assembler capabilities for VAES and VPLCMULQDQ support

This is a preparatory patch to introduce the optimized crypto algorithms
using AVX512 instructions which would require VAES and VPLCMULQDQ support.

Check for VAES and VPCLMULQDQ assembler support using AVX512 registers.

Cc: x86@...nel.org
Signed-off-by: Megha Dey <megha.dey@...el.com>
---
 arch/x86/Kconfig.assembler | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/Kconfig.assembler b/arch/x86/Kconfig.assembler
index 26b8c08..9ea0bc8 100644
--- a/arch/x86/Kconfig.assembler
+++ b/arch/x86/Kconfig.assembler
@@ -1,6 +1,16 @@
 # SPDX-License-Identifier: GPL-2.0
 # Copyright (C) 2020 Jason A. Donenfeld <Jason@...c4.com>. All Rights Reserved.
 
+config AS_VAES_AVX512
+	def_bool $(as-instr,vaesenc %zmm0$(comma)%zmm1$(comma)%zmm1) && 64BIT
+	help
+	  Supported by binutils >= 2.30 and LLVM integrated assembler
+
+config AS_VPCLMULQDQ
+	def_bool $(as-instr,vpclmulqdq \$0$(comma)%zmm2$(comma)%zmm6$(comma)%zmm4)
+	help
+	  Supported by binutils >= 2.30 and LLVM integrated assembler
+
 config AS_AVX512
 	def_bool $(as-instr,vpmovm2b %k1$(comma)%zmm5)
 	help
-- 
2.7.4