From patchwork Mon Jan 22 09:58:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Xu, Haibo1" X-Patchwork-Id: 13525074 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 7E207C4725D for ; Mon, 22 Jan 2024 09:47:14 +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=+HnP9iLS2tIm8qvY4zf/vRk1ONRYjhsL789B+PcENgU=; b=Aw+iA7rsh6RBPC PMyLPYGVBu4STIm5g4q9PtRoGFX1HZL8e90RygNhXu8JGFMkrfzxceDDMzePrDUxyY3JIYfoITvpD 6K4evYg4XrQt4mNj/oVzTUUpikO6ZbJJK1ju886cZPh0CDfpcguY+jmkpE008Rhlzy8q4v0co5KJM Ig1WDfWM2unAEfCJQ4Jqk24zVjEu4F5Fro/38j5yobLqRngirtwEFlsTF6rzrZ2uy45vSWjlPdI+C ShrHmsrxRF2Z6FheMj06/yAFuZko+psYDhWaGenbw9RU1318ukkUEmZGGRQFZ3wrSfqHJJisQJIb1 ACEIAD91O6Cy/EenK9IA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rRqtX-00BM3P-2P; Mon, 22 Jan 2024 09:47:07 +0000 Received: from mgamail.intel.com ([192.198.163.7]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1rRqtR-00BLyp-2E; Mon, 22 Jan 2024 09:47:05 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1705916822; x=1737452822; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=XjbRb6KLhs3MMD3Cdz5D4prMhpH/m5EAMfKa/Xyq4Ak=; b=fuWFVtWJjp0hxeOF7qSKNxZysDfToApMIx+fEJ1283vIBi0xnqf4/Wfp dIiTDTmys8IhILgmlfl6qBZyAYrt14R7vP4sK7f0CEcsFF1t69rF1LKQs lehPR3bMmc5aEaCgTXwZ7X5J3eo5OvXFdSRh2WIFPJAjBgvMgYQQXDSbi Hk9IxmmpGbV6aW4A0Q7EIRn+RJZFlLxGaaK3VY3HUet+2UX48L5LDZvxZ f039jDtBpJT/O8I6pyZYIGjPJfh/rI1rEylPEV4vhFduEGgf800BfaDUt NKPfKBYscioNOrgAlh0zIxuVPbljLre89+zYEuL8vq2NWB0qTk4LvHzO2 A==; X-IronPort-AV: E=McAfee;i="6600,9927,10960"; a="22641855" X-IronPort-AV: E=Sophos;i="6.05,211,1701158400"; d="scan'208";a="22641855" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmvoesa101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Jan 2024 01:47:01 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10960"; a="778535468" X-IronPort-AV: E=Sophos;i="6.05,211,1701158400"; d="scan'208";a="778535468" Received: from haibo-optiplex-7090.sh.intel.com ([10.239.159.132]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Jan 2024 01:46:52 -0800 From: Haibo Xu To: Cc: xiaobo55x@gmail.com, ajones@ventanamicro.com, Haibo Xu , Paul Walmsley , Palmer Dabbelt , Albert Ou , Paolo Bonzini , Shuah Khan , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Anup Patel , Atish Patra , Guo Ren , Mayuresh Chitale , Greentime Hu , Conor Dooley , Minda Chen , Samuel Holland , Jisheng Zhang , Sean Christopherson , Like Xu , Peter Xu , Vipin Sharma , Aaron Lewis , Thomas Huth , Maciej Wieczor-Retman , linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm-riscv@lists.infradead.org Subject: [PATCH v5 07/12] tools: riscv: Add header file vdso/processor.h Date: Mon, 22 Jan 2024 17:58:37 +0800 Message-Id: <212d0d848e54c887944ec38bd9f9729df8d1a27f.1705916069.git.haibo1.xu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240122_014701_763267_EA1896B3 X-CRM114-Status: GOOD ( 10.20 ) X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Borrow the cpu_relax() definitions from kernel's arch/riscv/include/asm/vdso/processor.h to tools/ for riscv. Signed-off-by: Haibo Xu Reviewed-by: Andrew Jones --- tools/arch/riscv/include/asm/vdso/processor.h | 32 +++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 tools/arch/riscv/include/asm/vdso/processor.h diff --git a/tools/arch/riscv/include/asm/vdso/processor.h b/tools/arch/riscv/include/asm/vdso/processor.h new file mode 100644 index 000000000000..662aca039848 --- /dev/null +++ b/tools/arch/riscv/include/asm/vdso/processor.h @@ -0,0 +1,32 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __ASM_VDSO_PROCESSOR_H +#define __ASM_VDSO_PROCESSOR_H + +#ifndef __ASSEMBLY__ + +#include + +static inline void cpu_relax(void) +{ +#ifdef __riscv_muldiv + int dummy; + /* In lieu of a halt instruction, induce a long-latency stall. */ + __asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy)); +#endif + +#ifdef CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE + /* + * Reduce instruction retirement. + * This assumes the PC changes. + */ + __asm__ __volatile__ ("pause"); +#else + /* Encoding of the pause instruction */ + __asm__ __volatile__ (".4byte 0x100000F"); +#endif + barrier(); +} + +#endif /* __ASSEMBLY__ */ + +#endif /* __ASM_VDSO_PROCESSOR_H */