From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E9FFBC46CD4 for ; Thu, 28 Dec 2023 01:49:29 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=sifive.com header.i=@sifive.com header.a=rsa-sha256 header.s=google header.b=bGxZmrSP; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4T0rzD3Xqbz3vch for ; Thu, 28 Dec 2023 12:49:28 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=sifive.com header.i=@sifive.com header.a=rsa-sha256 header.s=google header.b=bGxZmrSP; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sifive.com (client-ip=2607:f8b0:4864:20::52e; helo=mail-pg1-x52e.google.com; envelope-from=samuel.holland@sifive.com; receiver=lists.ozlabs.org) Received: from mail-pg1-x52e.google.com (mail-pg1-x52e.google.com [IPv6:2607:f8b0:4864:20::52e]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4T0rqH0sdkz3byT for ; Thu, 28 Dec 2023 12:42:34 +1100 (AEDT) Received: by mail-pg1-x52e.google.com with SMTP id 41be03b00d2f7-5cdfbd4e8caso2968949a12.0 for ; Wed, 27 Dec 2023 17:42:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; t=1703727753; x=1704332553; darn=lists.ozlabs.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=5FK4PuyaVW5o+fowKBsFSathMMiGJoXogQryv4/PrHo=; b=bGxZmrSPJ3pJag/xR1bY79ISnilA9GrHiYCpjiE5OmbXNnANO79c29ZllLnRvHH7sb pFpzB6znclxh/m4/uqHMMYim2S9ui0OK0ioWpETIhpyXgSP7jXCACmgPIqaQJDOc2i+E jsP5vZxLCcWxBg6D16j8FYEGWSFCqF0u16dib9pia9nBWaaPPQSvNkhDfo3epkJm4Zwa d+EynO4kIUlbfwO83Fjx0wlt5MvCqAIo5Xxv0rcJKidpPHA1pAyZfFvzxXDjnNE0s2Nx 32GdHgqGmpaDLKMdFgeNXt8yjaigKTyyHxHCla46w8ME33vw4waPJC8CZXovNIm+0WDH /QjQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1703727753; x=1704332553; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=5FK4PuyaVW5o+fowKBsFSathMMiGJoXogQryv4/PrHo=; b=ArHHTTqTv57KLr8vJ3ScppAakaDc1BZQ3h5/dKeSnKjtpM1OofLK1dxNgMDIirGTew c8X0+qSqJMyfVU8i3HHdTDII9IideVFwqkD82zYh8I5mU9Iej+orxfVlym/tLV09FO5h NusX+JLi5DVkHTpgMH/V7xxHjd3k1ntkmh/jt+sFhwG3fMeYevs03Qw2TtBd5LH/C3Zn jjRIqj8xvzlYSW/FVKZ78tTzooHjrv0X8IPATjamZ3f1ffwnIHhqC+T4hM2dbuvswR5H zNahZlILcXHMOKn6HC42EZFlClc6YuHmYTVNRrDzq+QM/krHE8HfEqRcsQRvCpWk8aCO cE0g== X-Gm-Message-State: AOJu0Yx79Zq3pfZnof+8X/gwCV5DAAQev4UXXL/xVL7d7RFfs37zovZB ln50I3aGmmtLAB52Rb26lKYxLVCjWG8+wg== X-Google-Smtp-Source: AGHT+IGDcwpDNI+ACJS8JwK6slMdt2P3zgEqkBXVCA8XIoKmVvXUWVJm0n6YvZtcZMejj6VORWJ3pQ== X-Received: by 2002:a05:6a21:612:b0:194:f17b:f877 with SMTP id ll18-20020a056a21061200b00194f17bf877mr9226487pzb.61.1703727752746; Wed, 27 Dec 2023 17:42:32 -0800 (PST) Received: from sw06.internal.sifive.com ([4.53.31.132]) by smtp.gmail.com with ESMTPSA id g24-20020aa78758000000b006d49ed3effasm7335440pfo.63.2023.12.27.17.42.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Dec 2023 17:42:32 -0800 (PST) From: Samuel Holland To: linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-riscv@lists.infradead.org, Christoph Hellwig Subject: [PATCH v2 08/14] powerpc: Implement ARCH_HAS_KERNEL_FPU_SUPPORT Date: Wed, 27 Dec 2023 17:41:58 -0800 Message-ID: <20231228014220.3562640-9-samuel.holland@sifive.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231228014220.3562640-1-samuel.holland@sifive.com> References: <20231228014220.3562640-1-samuel.holland@sifive.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, amd-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, Samuel Holland Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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. Reviewed-by: Christoph Hellwig Signed-off-by: Samuel Holland --- (no changes since v1) arch/powerpc/Kconfig | 1 + arch/powerpc/Makefile | 5 ++++- arch/powerpc/include/asm/fpu.h | 28 ++++++++++++++++++++++++++++ 3 files changed, 33 insertions(+), 1 deletion(-) create mode 100644 arch/powerpc/include/asm/fpu.h diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 6f105ee4f3cf..e96cb5b7c571 100644 --- a/arch/powerpc/Kconfig +++ b/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 diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index f19dbaa1d541..91106970a8c1 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -142,6 +142,9 @@ CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD)) CFLAGS-$(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 @@ -163,7 +166,7 @@ asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1) KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(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) diff --git a/arch/powerpc/include/asm/fpu.h b/arch/powerpc/include/asm/fpu.h new file mode 100644 index 000000000000..ca584e4bc40f --- /dev/null +++ b/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 */ -- 2.42.0