From patchwork Wed Sep 1 21:14:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Raghavendra Rao Ananta X-Patchwork-Id: 12470371 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 72CE2C432BE for ; Wed, 1 Sep 2021 21:14:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5DC31610A2 for ; Wed, 1 Sep 2021 21:14:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344472AbhIAVPf (ORCPT ); Wed, 1 Sep 2021 17:15:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39818 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343712AbhIAVPa (ORCPT ); Wed, 1 Sep 2021 17:15:30 -0400 Received: from mail-pl1-x649.google.com (mail-pl1-x649.google.com [IPv6:2607:f8b0:4864:20::649]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 25A92C061760 for ; Wed, 1 Sep 2021 14:14:33 -0700 (PDT) Received: by mail-pl1-x649.google.com with SMTP id s3-20020a1709029883b029012b41197000so247055plp.16 for ; Wed, 01 Sep 2021 14:14:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=+AY8FeEMdxANwbygbtDaWIs43jeZEXZSs/Nh/5qOONM=; b=sEIY6pZWU9JUoxbD3SFQAJZ+HaGDWEhhiX68l598G5kx1J0UFKGKlaSU38oiDTa1Tx M7YtesHq9xYqY0otdE0WpP3W5upth9uNrvUqlySOeWYnXdGfchoX7OqBLWKau4auWQci /Ml7YMnAC38eUFvCK8SQG8vG3CCC+WSwiLxcpI2nY/kIbj7jXbgrh4aijRFluLZH8qTQ r6862jdf17hMV2ehP0rYONQtfJac19PddlZr8gfK+HFjgAhjc3Uz1i5jonJrhI12qoMx tF06MUmg9WXAq6agNAue9s+mZxU7IgFJhBH9Ayn0+bL0etqXxP9RchKd8tiKtxV4bPA6 xt9g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=+AY8FeEMdxANwbygbtDaWIs43jeZEXZSs/Nh/5qOONM=; b=BFtznyhR4lWILfwZuLFke09QUG+WOqHiqlv8r8jUA/6qe3stEk6KWxudG4zCpqQ4BL SCp0X0mDgm8Pp/IR8T0lZGL3EDb9fJV43Aec3aSO3FoN92easu9TT4BKmb5Lx2MDhKid 8iZUxM4L5ZHBPibJRWS1tPhSLShmhdBOPUeXdIgadjyLxwIoUDklJnHP2VRxJOARd+dd zmbbPxNpPtEgRboSrLZVy/IN5y0wXKTw8HZSSQU6ocPTaffHVLnx/ha+QMF1HtsQcG7l 4/wEDvbR7aQLmbbricO6In84gsPkAGvDiekEQrM/zbpRStph/5XHpK31qifURs9/5DWj yPFw== X-Gm-Message-State: AOAM530MBfmmaom2F29Ay2vq0YtlabX9lZ/dHwNsveXYwSzBXa+AZ95Y vqZU5nwxvASq9JDmx00Lr/odceRIu7ZC X-Google-Smtp-Source: ABdhPJzfQCQqY7ZDdEh40WA7Lnhk+LTL8HLswLGjRlSmvbVQ8MCEnZQQ9EpYsHt2TdSwBvGTdcslFJvAEGDG X-Received: from rananta-virt.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1bcc]) (user=rananta job=sendgmr) by 2002:a62:1888:0:b029:3c9:7957:519b with SMTP id 130-20020a6218880000b02903c97957519bmr1345245pfy.17.1630530872495; Wed, 01 Sep 2021 14:14:32 -0700 (PDT) Date: Wed, 1 Sep 2021 21:14:05 +0000 In-Reply-To: <20210901211412.4171835-1-rananta@google.com> Message-Id: <20210901211412.4171835-6-rananta@google.com> Mime-Version: 1.0 References: <20210901211412.4171835-1-rananta@google.com> X-Mailer: git-send-email 2.33.0.153.gba50c8fa24-goog Subject: [PATCH v3 05/12] KVM: arm64: selftests: Add basic support to generate delays From: Raghavendra Rao Ananta To: Paolo Bonzini , Marc Zyngier , James Morse , Alexandru Elisei , Suzuki K Poulose Cc: Catalin Marinas , Will Deacon , Peter Shier , Ricardo Koller , Oliver Upton , Reiji Watanabe , Jing Zhang , Raghavendra Rao Anata , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Add udelay() support to generate a delay in the guest. The routines are derived and simplified from kernel's arch/arm64/lib/delay.c. Signed-off-by: Raghavendra Rao Ananta Reviewed-by: Andrew Jones Reviewed-by: Oliver Upton --- .../selftests/kvm/include/aarch64/delay.h | 25 +++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 tools/testing/selftests/kvm/include/aarch64/delay.h diff --git a/tools/testing/selftests/kvm/include/aarch64/delay.h b/tools/testing/selftests/kvm/include/aarch64/delay.h new file mode 100644 index 000000000000..329e4f5079ea --- /dev/null +++ b/tools/testing/selftests/kvm/include/aarch64/delay.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * ARM simple delay routines + */ + +#ifndef SELFTEST_KVM_ARM_DELAY_H +#define SELFTEST_KVM_ARM_DELAY_H + +#include "arch_timer.h" + +static inline void __delay(uint64_t cycles) +{ + enum arch_timer timer = VIRTUAL; + uint64_t start = timer_get_cntct(timer); + + while ((timer_get_cntct(timer) - start) < cycles) + cpu_relax(); +} + +static inline void udelay(unsigned long usec) +{ + __delay(usec_to_cycles(usec)); +} + +#endif /* SELFTEST_KVM_ARM_DELAY_H */