linux-kernel - [PATCH v3 02/10] RISC-V: add TOOLCHAIN_HAS_VECTOR

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Date: Sun, 21 Jan 2024 16:19:13 -0800
From: Eric Biggers <ebiggers@...nel.org>
To: linux-crypto@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org,
	Albert Ou <aou@...s.berkeley.edu>,
	Andy Chiu <andy.chiu@...ive.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Christoph Müllner <christoph.muellner@...ll.eu>,
	Heiko Stuebner <heiko@...ech.de>,
	Jerry Shih <jerry.shih@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Phoebe Chen <phoebe.chen@...ive.com>,
	hongrong.hsu@...ive.com
Subject: [PATCH v3 02/10] RISC-V: add TOOLCHAIN_HAS_VECTOR_CRYPTO

From: Eric Biggers <ebiggers@...gle.com>

Add a kconfig symbol that indicates whether the toolchain supports the
vector crypto extensions.  This is needed by the RISC-V crypto code.

Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 arch/riscv/Kconfig | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index bffbd869a0682..5613b2bb686ec 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -571,20 +571,27 @@ config RISCV_ISA_V_PREEMPTIVE
 	  consumption due to the allocation of per-task's kernel Vector context.
 
 config TOOLCHAIN_HAS_ZBB
 	bool
 	default y
 	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbb)
 	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbb)
 	depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
 	depends on AS_HAS_OPTION_ARCH
 
+# This symbol indicates that the toolchain supports all v1.0 vector crypto
+# extensions, including Zvk*, Zvbb, and Zvbc.  LLVM added all of these at once.
+# binutils added all except Zvkb, then added Zvkb.  So we just check for Zvkb.
+config TOOLCHAIN_HAS_VECTOR_CRYPTO
+	def_bool $(as-instr, .option arch$(comma) +zvkb)
+	depends on AS_HAS_OPTION_ARCH
+
 config RISCV_ISA_ZBB
 	bool "Zbb extension support for bit manipulation instructions"
 	depends on TOOLCHAIN_HAS_ZBB
 	depends on MMU
 	depends on RISCV_ALTERNATIVE
 	default y
 	help
 	   Adds support to dynamically detect the presence of the ZBB
 	   extension (basic bit manipulation) and enable its usage.
 
-- 
2.43.0