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riscv: Enable Vector code to be built 

This patch adds configs for building Vector code. First it detects the
reqired toolchain support for building the code. Then it provides an
option setting whether Vector is implicitly enabled to userspace.

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>
Co-developed-by: Andy Chiu <andy.chiu@sifive.com>
Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230605110724.21391-25-andy.chiu@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Guo Ren 2023-06-05 11:07:21 +00:00 committed by Palmer Dabbelt
parent e4bb020f3d
commit fa8e7cce55
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2 changed files with 36 additions and 1 deletions
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31
arch/riscv/Kconfig
View File

@ -466,6 +466,37 @@ 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
depends on AS_HAS_OPTION_ARCH
config RISCV_ISA_V
bool "VECTOR extension support"
depends on TOOLCHAIN_HAS_V
depends on FPU
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 RISCV_ISA_V_DEFAULT_ENABLE
bool "Enable userspace Vector by default"
depends on RISCV_ISA_V
default y
help
Say Y here if you want to enable Vector in userspace by default.
Otherwise, userspace has to make explicit prctl() call to enable
Vector, or enable it via the sysctl interface.
If you don't know what to do here, say Y.
config TOOLCHAIN_HAS_ZBB
bool
default y

6
arch/riscv/Makefile
View File

@ -60,6 +60,7 @@ 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) := $(riscv-march-y)v
ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC
KBUILD_CFLAGS += -Wa,-misa-spec=2.2
@ -71,7 +72,10 @@ endif
# Check if the toolchain supports Zihintpause extension
riscv-march-$(CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE) := $(riscv-march-y)_zihintpause
KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
# Remove F,D,V from isa string for all. Keep extensions between "fd" and "v" by
# matching non-v and non-multi-letter extensions out with the filter ([^v_]*)
KBUILD_CFLAGS += -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)fd([^v_]*)v?/\1\2/')
KBUILD_AFLAGS += -march=$(riscv-march-y)
KBUILD_CFLAGS += -mno-save-restore