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Message-Id: <20240507-compile_kernel_with_extensions-v2-6-722c21c328c6@rivosinc.com> Date: Tue, 07 May 2024 18:36:32 -0700 From: Charlie Jenkins <charlie@...osinc.com> To: Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, Conor Dooley <conor.dooley@...rochip.com>, Song Liu <song@...nel.org>, Xi Wang <xi.wang@...il.com>, Björn Töpel <bjorn@...osinc.com>, Clément Léger <cleger@...osinc.com>, Jessica Clarke <jrtc27@...c27.com>, Andy Chiu <andy.chiu@...ive.com> Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, Charlie Jenkins <charlie@...osinc.com> Subject: [PATCH v2 6/8] riscv: Add PLATFORM_SUPPORTS_RISCV_ISA_ZBA Kconfig option Zba can optimize kernel instruction sequences. Add a config option PLATFORM_SUPPORTS_RISCV_ISA_ZBA that allows arbitrary Zba instruction sequences to be emitted by the compiler. The existing "RISCV_ISA_ZBA" option is repurposed to be used to by kernel code to determine if either PLATFORM_MAY_SUPPORT_RISCV_ISA_ZBA or PLATFORM_SUPPORTS_RISCV_ISA_ZBA has been set. Signed-off-by: Charlie Jenkins <charlie@...osinc.com> --- arch/riscv/Kconfig.isa | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++ arch/riscv/Makefile | 1 + 2 files changed, 53 insertions(+) diff --git a/arch/riscv/Kconfig.isa b/arch/riscv/Kconfig.isa index 49bed8c75263..e7f28dc44137 100644 --- a/arch/riscv/Kconfig.isa +++ b/arch/riscv/Kconfig.isa @@ -186,6 +186,58 @@ config PLATFORM_MAY_SUPPORT_RISCV_ISA_SVPBMT If you don't know what to do here, say Y. + +config TOOLCHAIN_HAS_ZBA + bool + default y + depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zba) + depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zba) + depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900 + depends on AS_HAS_OPTION_ARCH + +config RISCV_ISA_ZBA + bool + +choice + prompt "Zba extension for address generation instructions support" + default PLATFORM_MAY_SUPPORT_RISCV_ISA_ZBA + help + This selects the level of support for Zba instructions to be + built into the Linux Kernel. This does not impact whether Zba + instructions are allowed to be emitted by user-space code. + + The Zba extension provides instructions to accelerate a number + of address generation instruction sequences. + +config PROHIBIT_RISCV_ISA_ZBA + bool "Prohibit Zba instruction sequences" + depends on NONPORTABLE + help + Regardless of if the platform supports Zba instructions, + prohibit the kernel from emitting Zba instructions. + +config PLATFORM_MAY_SUPPORT_RISCV_ISA_ZBA + bool "Allow Zba instruction sequences if supported" + depends on TOOLCHAIN_HAS_ZBB + depends on RISCV_ALTERNATIVE + select RISCV_ISA_ZBA + help + Add support for enabling optimisations in the kernel when the + Zba extension is detected at boot. + +config PLATFORM_SUPPORTS_RISCV_ISA_ZBA + bool "Emit Zba instructions when building Linux" + depends on TOOLCHAIN_HAS_ZBB + depends on NONPORTABLE + select RISCV_ISA_ZBA + help + Adds "zba" to the ISA subsets that the toolchain is allowed to emit + when building Linux, which results in Zba instructions in the + Linux binary. This option produces a kernel that will not run on + systems that do not support the Zba extension. + +endchoice + config TOOLCHAIN_HAS_ZBB bool default y diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index 6b0c3a782f99..c8ec38b9880a 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -66,6 +66,7 @@ riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd riscv-march-$(CONFIG_PLATFORM_SUPPORTS_RISCV_ISA_C) := $(riscv-march-y)c +riscv-march-$(CONFIG_PLATFORM_SUPPORTS_RISCV_ISA_ZBA) := $(riscv-march-y)_zba riscv-march-$(CONFIG_PLATFORM_SUPPORTS_RISCV_ISA_ZBB) := $(riscv-march-y)_zbb ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC -- 2.44.0
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