From patchwork Fri Oct 27 10:50:50 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Dave Martin X-Patchwork-Id: 10029579 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 4C5B2602D6 for ; Fri, 27 Oct 2017 10:53:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3B1FF28F8E for ; Fri, 27 Oct 2017 10:53:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2E42028F90; Fri, 27 Oct 2017 10:53:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C344C28F8E for ; Fri, 27 Oct 2017 10:53:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=QWKcxqE3rqXjuhdrKrgPMgbamk4R6M810fJGjGSsCYQ=; b=QPmUMjHix5Rgh0 RdShmpdKJysf3izPPR41a3w4Q0cq04bXqoIpXY9rPffMeKGOM5ujcgfyaR2ERwtWz+EegiR4Tkwhg PpP4FcfKkfzqI3WUhrR/Y0NRg9kCJdt9F4h8x0r32GTDY1hU9KGbvXJOkzlvSNdSN/kDMpz3SSrAo 9U1LOZcuN7ZRf+dunpWtxPEDEcZYXAhLhwiOhRW1NB4Scza9yaoYunPCoAlhcXt3X3COsmeqJNIdF U8Xgw2FvNvVsHNNplUFqzgz9XkmIuExoYXIcVCUepjGrQ+XZaOA9kW6pXavCmSxH0GUkFxd26GYGS lZMMViazVkhKI7dvaEyQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1e82Gd-00055Z-JC; Fri, 27 Oct 2017 10:53:35 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1e82F5-0003vS-Ph for linux-arm-kernel@lists.infradead.org; Fri, 27 Oct 2017 10:52:08 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 738DD16A3; Fri, 27 Oct 2017 03:51:35 -0700 (PDT) Received: from e103592.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id B64DC3F24A; Fri, 27 Oct 2017 03:51:33 -0700 (PDT) From: Dave Martin To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v4 08/28] arm64/sve: Kconfig update and conditional compilation support Date: Fri, 27 Oct 2017 11:50:50 +0100 Message-Id: <1509101470-7881-9-git-send-email-Dave.Martin@arm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1509101470-7881-1-git-send-email-Dave.Martin@arm.com> References: <1509101470-7881-1-git-send-email-Dave.Martin@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20171027_035200_199132_A36DCE99 X-CRM114-Status: UNSURE ( 9.94 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, Okamoto Takayuki , libc-alpha@sourceware.org, Ard Biesheuvel , Szabolcs Nagy , Catalin Marinas , Will Deacon , =?UTF-8?q?Alex=20Benn=C3=A9e?= , kvmarm@lists.cs.columbia.edu Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds CONFIG_ARM64_SVE to control building of SVE support into the kernel, and adds a stub predicate system_supports_sve() to control conditional compilation and runtime SVE support. system_supports_sve() just returns false for now: it will be replaced with a non-trivial implementation in a later patch, once SVE support is complete enough to be enabled safely. Signed-off-by: Dave Martin Reviewed-by: Alex Bennée Reviewed-by: Catalin Marinas --- arch/arm64/Kconfig | 11 +++++++++++ arch/arm64/include/asm/cpufeature.h | 5 +++++ 2 files changed, 16 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 5cfb79d..1046074 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -976,6 +976,17 @@ config ARM64_PMEM endmenu +config ARM64_SVE + bool "ARM Scalable Vector Extension support" + default y + help + The Scalable Vector Extension (SVE) is an extension to the AArch64 + execution state which complements and extends the SIMD functionality + of the base architecture to support much larger vectors and to enable + additional vectorisation opportunities. + + To enable use of this extension on CPUs that implement it, say Y. + config ARM64_MODULE_CMODEL_LARGE bool diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 428ee1f..4ea3441 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -262,6 +262,11 @@ static inline bool system_uses_ttbr0_pan(void) !cpus_have_const_cap(ARM64_HAS_PAN); } +static inline bool system_supports_sve(void) +{ + return false; +} + #endif /* __ASSEMBLY__ */ #endif