[PATCH -next v14 19/19] riscv: Enable Vector code to be built

Andy Chiu
2023-02-24T17:03:41Z

From: Guo Ren <guoren@linux.alibaba.com>

This patch adds a config which enables vector feature from the kernel
space.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Co-developed-by: Greentime Hu <greentime.hu@sifive.com>
Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
Suggested-by: Vineet Gupta <vineetg@rivosinc.com>
Suggested-by: Atish Patra <atishp@atishpatra.org>
Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
---
arch/riscv/Kconfig | 18 ++++++++++++++++++
arch/riscv/Makefile | 3 ++-
2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 81eb031887d2..19deeb3bb36b 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -418,6 +418,24 @@ config RISCV_ISA_SVPBMT

If you don't know what to do here, say Y.

+config TOOLCHAIN_HAS_V
+ bool
+ default y
+ depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64iv)
+ depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32iv)
+ depends on LLD_VERSION >= 140000 || LD_VERSION >= 23800
+
+config RISCV_ISA_V
+ bool "VECTOR extension support"
+ depends on TOOLCHAIN_HAS_V
+ select DYNAMIC_SIGFRAME
+ default y
+ help
+ Say N here if you want to disable all vector related procedure
+ in the kernel.
+
+ If you don't know what to do here, say Y.
+
config TOOLCHAIN_HAS_ZBB
bool
default y
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 76989561566b..375a048b11cb 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -56,6 +56,7 @@ riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima
riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima
riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd
riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c
+riscv-march-$(CONFIG_RISCV_ISA_V) := $(riscv-march-y)v

# Newer binutils versions default to ISA spec version 20191213 which moves some
# instructions from the I extension to the Zicsr and Zifencei extensions.
@@ -65,7 +66,7 @@ riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei
# Check if the toolchain supports Zihintpause extension
riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause

-KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
+KBUILD_CFLAGS += -march=$(subst fdv,,$(riscv-march-y))
KBUILD_AFLAGS += -march=$(riscv-march-y)

KBUILD_CFLAGS += -mno-save-restore
--
2.17.1