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 8C0FDC4167B for ; Fri, 8 Dec 2023 06:01:33 +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=GoZblyFY; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4SmgWJ0cY7z3dTt for ; Fri, 8 Dec 2023 17:01:32 +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=GoZblyFY; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sifive.com (client-ip=2607:f8b0:4864:20::636; helo=mail-pl1-x636.google.com; envelope-from=samuel.holland@sifive.com; receiver=lists.ozlabs.org) Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) (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 4SmgN11Qthz3clL for ; Fri, 8 Dec 2023 16:55:13 +1100 (AEDT) Received: by mail-pl1-x636.google.com with SMTP id d9443c01a7336-1d0538d9bbcso15753415ad.3 for ; Thu, 07 Dec 2023 21:55:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; t=1702014911; x=1702619711; 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=+YzUuPYE3yay4aPXmYR/ZrTN/zes857jj0i/rwk/8vA=; b=GoZblyFYLGvKFOdS4LQN9pDv6sXXWHYCl4nYsn0utojZSk5G7zKlFevSxb/fNPLOIJ xJpBmK9aCTKpFAPNckXx2Hlz3pEJ98Z8aLHeYRYqgkx12DZJu0VEgMCNscaef6ChqSgB jwqsnIF4AgmADeIIGytCOmLcLHDSLPGRoWoa+QrRNBDjKsWrLuxbGLtK6igihqXtvMr2 Vb5jUygv4UtQ2zJro4nJ6hDPhOnNllYzIxcV2wvjnxGKFCed7mIHILavBiXGhRON6pjh Mn2hL2VgyWsexjqGmEkumLjO8FRofIP4KW78nveCMbLpvz/W5OAgohLcxGnPgeYtzuHo 04FA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702014911; x=1702619711; 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=+YzUuPYE3yay4aPXmYR/ZrTN/zes857jj0i/rwk/8vA=; b=K/LUzESI0id0zsKBQDeyYcsDmCYsVS8yXagooRGhpagCeH1BV7YgQEfNUCsyc7CuZ/ WqlyZODTNbv1OB2T53PbXb6cBuiRbMOMEwR969wD8FlBSO4HsYhrXrYPXo/WDGvxZrXa UGPIvy26EVn1GFTPgdA+FdJXrf8l8g0RFmSeKNC3rx8qiDyo4JmyHeq3no3smWxyMKen GW5y8MNR06Rio/hyz66tb3ew1rmiVI2RedlBJzcwN0Rh/KAozrwfnwDIpMmBGVfK4BGn HolYqIpBRl6bKdqQpcNhYoxSPGXaxW4HK8NFtip6+gtKxEMHAe0394WFhjEa2OQI8anV rO7A== X-Gm-Message-State: AOJu0YyMVLtue3g91HC2dZsvYBiv5lJwyFTy8GZ8zMTJBW4PIHRcDjTC kqABEwR/M7/tFuRZNrLi119LTw== X-Google-Smtp-Source: AGHT+IGkpKPNTZyORkUclzuJiqEGnd764SXTk1kHONQX0GukAsvi/MYXEyo8qWiBUacvBaveWOlV4w== X-Received: by 2002:a17:902:7e82:b0:1d0:b9f4:800f with SMTP id z2-20020a1709027e8200b001d0b9f4800fmr3698333pla.109.1702014911528; Thu, 07 Dec 2023 21:55:11 -0800 (PST) Received: from sw06.internal.sifive.com ([4.53.31.132]) by smtp.gmail.com with ESMTPSA id s22-20020a170902989600b001ce5b859a59sm786250plp.305.2023.12.07.21.55.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Dec 2023 21:55:11 -0800 (PST) From: Samuel Holland To: linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-riscv@lists.infradead.org, Christoph Hellwig Subject: [RFC PATCH 07/12] powerpc: Implement ARCH_HAS_KERNEL_FPU_SUPPORT Date: Thu, 7 Dec 2023 21:54:37 -0800 Message-ID: <20231208055501.2916202-8-samuel.holland@sifive.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231208055501.2916202-1-samuel.holland@sifive.com> References: <20231208055501.2916202-1-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, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, 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. Signed-off-by: Samuel Holland --- 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..2d5f21baf6ff 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