From patchwork Fri Mar 29 07:18:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Samuel Holland X-Patchwork-Id: 13610352 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 59063CD128E for ; Fri, 29 Mar 2024 08:34:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ADDAum6EK6OGlR180pGC0MY4I1cfVMaid7xNtXMHCBs=; b=FwjOi98UDYiksL ma58ZqtRFnvy38Tfk0ORhaXEiqvuaa8TVu9iUCJ/bkZEWgirk5Tdx/8JpqFO8fapGYkSNIy5jmlWF UZt1h1TEfoAPM01iJFq+680NPs/seTbmBqvTCQaV3AyMl3rkRtP9pZOKHK8pupdfDWpBsxtiinrO/ 0PIap4ncQAAU/w2S55SSKXb92i6hSj626bPjmv8XgdXXoIzIQU4xOFdxicfa58MNrf4y7wEiNpgam zVV+v3HWRa1Mez+9CjGi0lqLrSTEjuRxHLfpxlskhms4nqO8K4ZYqIij8qBLz/IDPbKo5yOTqg4Hp WFDoOo+kgQBb5I9lvp4A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rq7gb-0000000HKZh-3lQ8; Fri, 29 Mar 2024 08:34:05 +0000 Received: from mail-pj1-x1033.google.com ([2607:f8b0:4864:20::1033]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rq6bX-0000000H8Wv-0YlB for linux-arm-kernel@lists.infradead.org; Fri, 29 Mar 2024 07:24:50 +0000 Received: by mail-pj1-x1033.google.com with SMTP id 98e67ed59e1d1-2a21330d093so347434a91.2 for ; Fri, 29 Mar 2024 00:24:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; t=1711697086; x=1712301886; darn=lists.infradead.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=RfeToGq8Q96lZ3sXR0xrZDFoq0gdI38cqcIbuzYANg0=; b=Xa+jlzT/YtA4oNEL2Xom1uuIQjTtiPNlnOVmw9C2zDbV4uoxCHKdrPlsjrnTS5RA8g c4yGH/rQb92Iir4eHU9uCA1He/INGgkWVSm8Q0cWqZVeLhjHws9f925gi8BkaYFWHHtq 5Nu0YSj6kEfrfsH1zdztHnIHj2rtzFy9TgreH5rovZXxM3Bc6E5IFxrCKjl2+A/NVvpb SO85BEBorKVec7/k6DHI7yYecwzDnVbLgG9a8LBWuUdLQ1qTQ0De0EOygk9LdtfgFyU4 G6NvUe9nlOEepLH3TTYZ5gQgy6caGK+7YmehyGKxXw3cjFgW+tLvwCn2DrWvHXjd64GM xspQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1711697086; x=1712301886; 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=RfeToGq8Q96lZ3sXR0xrZDFoq0gdI38cqcIbuzYANg0=; b=wDg8EJVt6/ZENU5UT51jfznO+1Hg3zG6i2jv5zTeO34czL1ptEPXwSyV074xF+YPHE MaL0CALQnI+iP9k0WtA9Q7EomGplysN8NfyoNFybwP+tAftpVvOdRBOZdiVlWaEZ/hXm Wv6YXkl9cuz0Jls2zRLHUCAw/kwY76xNbqsjgD8vvr0p+nNqjVqUMNg5vNlqr7/wQj+l LMONR/brlpEanndEvecuHnqTAXBpaoShMLNlLnQXJfGJVXascwMaU2f89qDOlKvy5dbc G0lTiKIV8nNhgBFXeBsiekg0ogqwfrgCViTHfn9DVaTOilERE/0H+sr3dRNGJ3RIJo8Z mteg== X-Forwarded-Encrypted: i=1; AJvYcCX96oS+RrG5L/EBD+LrrDGAc20Rysn0KKkILdMPUwAWNC7Olg3v+JMe0W2kmH9FnwA4Wb1K89S5KsrMSJCbw9nI43T0ZI/6w+0htOK/UrlbzuGQIBo= X-Gm-Message-State: AOJu0YyN2O89eAH1Q2CJC343YQUBjnyL1/c0yMzA2tnqwwxYcAgIWgg6 90w9NvrlHvaqmdYAz6CF9uOBct4wiVkLO/3cxnDUO73WucC0FMvcnrdSO30WlSo= X-Google-Smtp-Source: AGHT+IGQfC9gwOMWVs1GDk/ouQ8mrl3lJb1JowaZL6ev/gV/g9creRjfkW6AQIWqS7U8Lf5+l0COxw== X-Received: by 2002:a17:90a:4594:b0:2a2:88d:cdcb with SMTP id v20-20020a17090a459400b002a2088dcdcbmr1743529pjg.26.1711697086007; Fri, 29 Mar 2024 00:24:46 -0700 (PDT) Received: from sw06.internal.sifive.com ([4.53.31.132]) by smtp.gmail.com with ESMTPSA id b8-20020a17090a010800b0029ddac03effsm4971798pjb.11.2024.03.29.00.24.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Mar 2024 00:24:45 -0700 (PDT) From: Samuel Holland To: Andrew Morton , linux-arm-kernel@lists.infradead.org, x86@kernel.org Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, Christoph Hellwig , loongarch@lists.linux.dev, amd-gfx@lists.freedesktop.org, Samuel Holland , Russell King Subject: [PATCH v4 02/15] ARM: Implement ARCH_HAS_KERNEL_FPU_SUPPORT Date: Fri, 29 Mar 2024 00:18:17 -0700 Message-ID: <20240329072441.591471-3-samuel.holland@sifive.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240329072441.591471-1-samuel.holland@sifive.com> References: <20240329072441.591471-1-samuel.holland@sifive.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240329_002447_223057_9BBDDC1E X-CRM114-Status: GOOD ( 16.79 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org ARM provides an equivalent to the common kernel-mode FPU API, but in a different header and using different function names. Add a wrapper header, and export CFLAGS adjustments as found in lib/raid6/Makefile. Reviewed-by: Christoph Hellwig Signed-off-by: Samuel Holland --- (no changes since v2) Changes in v2: - Remove file name from header comment arch/arm/Kconfig | 1 + arch/arm/Makefile | 7 +++++++ arch/arm/include/asm/fpu.h | 15 +++++++++++++++ 3 files changed, 23 insertions(+) create mode 100644 arch/arm/include/asm/fpu.h diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index b14aed3a17ab..b1751c2cab87 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -15,6 +15,7 @@ config ARM select ARCH_HAS_FORTIFY_SOURCE select ARCH_HAS_KEEPINITRD select ARCH_HAS_KCOV + select ARCH_HAS_KERNEL_FPU_SUPPORT if KERNEL_MODE_NEON select ARCH_HAS_MEMBARRIER_SYNC_CORE select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_PTE_SPECIAL if ARM_LPAE diff --git a/arch/arm/Makefile b/arch/arm/Makefile index d82908b1b1bb..71afdd98ddf2 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -130,6 +130,13 @@ endif # Accept old syntax despite ".syntax unified" AFLAGS_NOWARN :=$(call as-option,-Wa$(comma)-mno-warn-deprecated,-Wa$(comma)-W) +# The GCC option -ffreestanding is required in order to compile code containing +# ARM/NEON intrinsics in a non C99-compliant environment (such as the kernel) +CC_FLAGS_FPU := -ffreestanding +# Enable +CC_FLAGS_FPU += -isystem $(shell $(CC) -print-file-name=include) +CC_FLAGS_FPU += -march=armv7-a -mfloat-abi=softfp -mfpu=neon + ifeq ($(CONFIG_THUMB2_KERNEL),y) CFLAGS_ISA :=-Wa,-mimplicit-it=always $(AFLAGS_NOWARN) AFLAGS_ISA :=$(CFLAGS_ISA) -Wa$(comma)-mthumb diff --git a/arch/arm/include/asm/fpu.h b/arch/arm/include/asm/fpu.h new file mode 100644 index 000000000000..2ae50bdce59b --- /dev/null +++ b/arch/arm/include/asm/fpu.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2023 SiFive + */ + +#ifndef __ASM_FPU_H +#define __ASM_FPU_H + +#include + +#define kernel_fpu_available() cpu_has_neon() +#define kernel_fpu_begin() kernel_neon_begin() +#define kernel_fpu_end() kernel_neon_end() + +#endif /* ! __ASM_FPU_H */