From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C050184FDA for ; Wed, 27 Mar 2024 20:30:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711571415; cv=none; b=KH+WDiyWx30DztothvJVPAqltehBTTRI/asfxHBVOK1St94d3uh6zrbeRD9TSNoCCBEktRO7PnJ2b1TzC9NWCWUYSJta7SF8plgI9WUcgfuN2C5dw6s7C8lO4pWfdxQ/tGTPF3Gl1HIn+XdONQe4/5paKnBYPuJ51MIEniRbqu4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711571415; c=relaxed/simple; bh=S52IFR/U43+xJNkZIzj+Kofdtb7i8gtFXBUMgvqFoS4=; h=Date:To:From:Subject:Message-Id; b=KRsBnWzJ0EkzjYpvjr7/1mYDDeKnumIsW9GiV8vJ4WJtGr1jD3GN+JfTornNYqYZpTyOGEUWsXOXOOih+nfQmZe7wy3++qhfWrMIEPJ8LWb3T0a1MmMhCMXL7SX67e7GYW91im+BJcz0xAdYOlUQbgwJfcIqgBsJ/rhBSLMLFOE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=sqzHtTOA; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="sqzHtTOA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5033FC433C7; Wed, 27 Mar 2024 20:30:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1711571415; bh=S52IFR/U43+xJNkZIzj+Kofdtb7i8gtFXBUMgvqFoS4=; h=Date:To:From:Subject:From; b=sqzHtTOAulfI58ljzH0bdNqqgYQr6x4SDzjm6+aUrwmxcf0S+BhIJtGGMpSunWh2v s5BuZR1ocnRZSs6hGZYzACFupXJxm252WEibJ2N3XygBtSqryJffQvdg+Ht/lXVRUD 1wb4yDBqV+8lAvZSOxxby0llAtjMZ/qGK84enwkA= Date: Wed, 27 Mar 2024 13:30:14 -0700 To: mm-commits@vger.kernel.org,will@kernel.org,tglx@linutronix.de,palmer@rivosinc.com,nicolas@fjasle.eu,nathan@kernel.org,mpe@ellerman.id.au,mingo@redhat.com,masahiroy@kernel.org,linux@armlinux.org.uk,hch@lst.de,git@xen0n.name,dave.hansen@linux.intel.com,corbet@lwn.net,chenhuacai@kernel.org,catalin.marinas@arm.com,bp@alien8.de,alexander.deucher@amd.com,samuel.holland@sifive.com,akpm@linux-foundation.org From: Andrew Morton Subject: + powerpc-implement-arch_has_kernel_fpu_support.patch added to mm-nonmm-unstable branch Message-Id: <20240327203015.5033FC433C7@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: powerpc: implement ARCH_HAS_KERNEL_FPU_SUPPORT has been added to the -mm mm-nonmm-unstable branch. Its filename is powerpc-implement-arch_has_kernel_fpu_support.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/powerpc-implement-arch_has_kernel_fpu_support.patch This patch will later appear in the mm-nonmm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Samuel Holland Subject: powerpc: implement ARCH_HAS_KERNEL_FPU_SUPPORT Date: Wed, 27 Mar 2024 13:00:39 -0700 PowerPC provides an equivalent to the common kernel-mode FPU API, but in a different header and using different function names. The PowerPC API also requires a non-preemptible context. Add a wrapper header, and export the CFLAGS adjustments. Link: https://lkml.kernel.org/r/20240327200157.1097089-9-samuel.holland@sifive.com Signed-off-by: Samuel Holland Acked-by: Michael Ellerman (powerpc) Reviewed-by: Christoph Hellwig Cc: Alex Deucher Cc: Borislav Petkov (AMD) Cc: Catalin Marinas Cc: Dave Hansen Cc: Huacai Chen Cc: Ingo Molnar Cc: Jonathan Corbet Cc: Masahiro Yamada Cc: Nathan Chancellor Cc: Nicolas Schier Cc: Palmer Dabbelt Cc: Russell King Cc: Thomas Gleixner Cc: WANG Xuerui Cc: Will Deacon Signed-off-by: Andrew Morton --- arch/powerpc/Kconfig | 1 + arch/powerpc/Makefile | 5 ++++- arch/powerpc/include/asm/fpu.h | 28 ++++++++++++++++++++++++++++ 3 files changed, 33 insertions(+), 1 deletion(-) --- /dev/null +++ a/arch/powerpc/include/asm/fpu.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2023 SiFive + */ + +#ifndef _ASM_POWERPC_FPU_H +#define _ASM_POWERPC_FPU_H + +#include + +#include +#include + +#define kernel_fpu_available() (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE)) + +static inline void kernel_fpu_begin(void) +{ + preempt_disable(); + enable_kernel_fp(); +} + +static inline void kernel_fpu_end(void) +{ + disable_kernel_fp(); + preempt_enable(); +} + +#endif /* ! _ASM_POWERPC_FPU_H */ --- a/arch/powerpc/Kconfig~powerpc-implement-arch_has_kernel_fpu_support +++ a/arch/powerpc/Kconfig @@ -137,6 +137,7 @@ config PPC select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAS_HUGEPD if HUGETLB_PAGE select ARCH_HAS_KCOV + select ARCH_HAS_KERNEL_FPU_SUPPORT if PPC_FPU select ARCH_HAS_MEMBARRIER_CALLBACKS select ARCH_HAS_MEMBARRIER_SYNC_CORE select ARCH_HAS_MEMREMAP_COMPAT_ALIGN if PPC_64S_HASH_MMU --- a/arch/powerpc/Makefile~powerpc-implement-arch_has_kernel_fpu_support +++ a/arch/powerpc/Makefile @@ -153,6 +153,9 @@ CFLAGS-$(CONFIG_PPC32) += $(call cc-opti CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata) +CC_FLAGS_FPU := $(call cc-option,-mhard-float) +CC_FLAGS_NO_FPU := $(call cc-option,-msoft-float) + ifdef CONFIG_FUNCTION_TRACER ifdef CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY @@ -174,7 +177,7 @@ asinstr := $(call as-instr,lis 9$(comma) KBUILD_CPPFLAGS += -I $(srctree)/arch/powerpc $(asinstr) KBUILD_AFLAGS += $(AFLAGS-y) -KBUILD_CFLAGS += $(call cc-option,-msoft-float) +KBUILD_CFLAGS += $(CC_FLAGS_NO_FPU) KBUILD_CFLAGS += $(CFLAGS-y) CPP = $(CC) -E $(KBUILD_CFLAGS) _ Patches currently in -mm which might be from samuel.holland@sifive.com are arch-add-arch_has_kernel_fpu_support.patch arm-implement-arch_has_kernel_fpu_support.patch arm-crypto-use-cc_flags_fpu-for-neon-cflags.patch arm64-implement-arch_has_kernel_fpu_support.patch arm64-crypto-use-cc_flags_fpu-for-neon-cflags.patch lib-raid6-use-cc_flags_fpu-for-neon-cflags.patch loongarch-implement-arch_has_kernel_fpu_support.patch powerpc-implement-arch_has_kernel_fpu_support.patch x86-implement-arch_has_kernel_fpu_support.patch riscv-add-support-for-kernel-mode-fpu.patch drm-amd-display-use-arch_has_kernel_fpu_support.patch selftests-fpu-move-fp-code-to-a-separate-translation-unit.patch selftests-fpu-allow-building-on-other-architectures.patch