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Peter Anvin" Cc: linux-kernel@vger.kernel.org Subject: [PATCH] x86/cpu: Add support for modern x86-64-v* march Date: Fri, 7 Jul 2023 11:56:00 +0100 Message-Id: <20230707105601.133221-1-dimitri.ledkov@canonical.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add support for setting march to x86-64-v2, x86-64-v3, x86-64-v4 with tuning set to an early family of CPUs that support such instruction levels. By default gcc sets generic tuning for x86-64-v*, which is suboptimal for all brands of CPUs with such instruction set support. Signed-off-by: Dimitri John Ledkov --- arch/x86/Kconfig.cpu | 23 ++++++++++++++++++++++- arch/x86/Makefile | 11 +++++++++++ 2 files changed, 33 insertions(+), 1 deletion(-) diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu index 00468adf18..70e70b4733 100644 --- a/arch/x86/Kconfig.cpu +++ b/arch/x86/Kconfig.cpu @@ -294,6 +294,27 @@ config GENERIC_CPU Generic x86-64 CPU. Run equally well on all x86-64 CPUs. +config X86_64_V2 + bool "x86-64-v2" + depends on X86_64 + help + x86-64-v2 CPU. + Run well on x86-64-v2 capable CPUs. + +config X86_64_V3 + bool "x86-64-v3" + depends on X86_64 + help + x86-64-v3 CPU. + Run well on x86-64-v3 capable CPUs. + +config X86_64_V4 + bool "x86-64-v4" + depends on X86_64 + help + x86-64-v4 CPU. + Run well on x86-64-v4 capable CPUs. + endchoice config X86_GENERIC @@ -318,7 +339,7 @@ config X86_INTERNODE_CACHE_SHIFT config X86_L1_CACHE_SHIFT int default "7" if MPENTIUM4 || MPSC - default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU + default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU || X86_64_V2 || X86_64_V3 || X86_64_V4 default "4" if MELAN || M486SX || M486 || MGEODEGX1 default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX diff --git a/arch/x86/Makefile b/arch/x86/Makefile index fdc2e3abd6..ee97501970 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -154,6 +154,14 @@ else cflags-$(CONFIG_MCORE2) += -march=core2 cflags-$(CONFIG_MATOM) += -march=atom cflags-$(CONFIG_GENERIC_CPU) += -mtune=generic + # Note gcc for -march=x86-64-v* sets genetic tuning only, + # rather than something sensible / minimum tuning from the + # same family. Set mtune to early family of CPUs that support + # such instructions, which works better across all CPU brands. + cflags-$(CONFIG_X86_64_V2) += -march=x86-64-v2 -mtune=nehalem + cflags-$(CONFIG_X86_64_V3) += -march=x86-64-v3 -mtune=skylake + cflags-$(CONFIG_X86_64_V4) += -march=x86-64-v4 -mtune=skylake-avx512 + KBUILD_CFLAGS += $(cflags-y) rustflags-$(CONFIG_MK8) += -Ctarget-cpu=k8 @@ -161,6 +169,9 @@ else rustflags-$(CONFIG_MCORE2) += -Ctarget-cpu=core2 rustflags-$(CONFIG_MATOM) += -Ctarget-cpu=atom rustflags-$(CONFIG_GENERIC_CPU) += -Ztune-cpu=generic + rustflags-$(CONFIG_X86_64_V2) += -Ctarget-cpu=x86-64-v2 + rustflags-$(CONFIG_X86_64_V3) += -Ctarget-cpu=x86-64-v3 + rustflags-$(CONFIG_X86_64_V4) += -Ctarget-cpu=x86-64-v4 KBUILD_RUSTFLAGS += $(rustflags-y) KBUILD_CFLAGS += -mno-red-zone -- 2.34.1