From patchwork Wed Aug 18 18:43:06 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: 12444997 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 2B095C4338F for ; Wed, 18 Aug 2021 18:43:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 03DD4610A5 for ; Wed, 18 Aug 2021 18:43:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232979AbhHRSoH (ORCPT ); Wed, 18 Aug 2021 14:44:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53312 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232584AbhHRSoD (ORCPT ); Wed, 18 Aug 2021 14:44:03 -0400 Received: from mail-pl1-x64a.google.com (mail-pl1-x64a.google.com [IPv6:2607:f8b0:4864:20::64a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 32297C061764 for ; Wed, 18 Aug 2021 11:43:28 -0700 (PDT) Received: by mail-pl1-x64a.google.com with SMTP id 5-20020a170902ee45b029012d3a69c6c5so781543plo.7 for ; Wed, 18 Aug 2021 11:43:28 -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=JcHymXf2ERbzAFxFFXQtQ/oPOCBg0VdgmGHaGoYCh8I=; b=XclqRPUA0/dOnnUxZ6e5xfFEGz1bzMNLZDMWFZSNFvSFo8M+XkqAR82qhWjdPE04Gd aXBogWWruyzy9kxHz03pmBGH/UtNF0W3hCs5Aaq4tpFylnvpbS77o1qVZhE6gSQuUQw4 mJkGlM8sPbtWCf+da7Jh+QMhfXB3oiO3IwX+9fwS1X7zzd6PquEQPLAul6Z6D2FsdeuH O1YzzLW8k2PHAi3uM/cXlCc5b8E7dTrTBvjTkL5DH6rkSScy+NHjgpTDduDeCEmNH+mF K/Okj9Ec+GiUjBFew8hgsuz9H4bIcWhcekTwVtjgiLg39+UVOacGwheMLt6SoqfOWwiK SluA== 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=JcHymXf2ERbzAFxFFXQtQ/oPOCBg0VdgmGHaGoYCh8I=; b=nkmdYRT/z2FzGgC1NpvaEff+Sz9QzLgR8/KyArEPodANV6cJo64ayZBWDMsX3yQDQJ dLlt+RbDNtZ7Udc/wg74DvxFn/eM5ISkz+OoAEpHorplJ+GShydOj/sQEEYYI2Y4+9iQ 1wtTR7GWKSDUo4SJ0ynsM+CqlJthkFeXThKJz98Yt7erogVOj+r2KA/DB4vKKW8EIYVU 8L++KPCcUnD3B9sgQgq9qAcqqDZomdUQuw6HZfDlqbTORPpz1L+U03upbRljTWrDeBG3 z7Kv9aGGPWeTDQ4Vt86TrdjcdonytHZ2pWcHhbBCrXiTKZH50oyMgXpwBCkp0l6D0+A2 lDRA== X-Gm-Message-State: AOAM533ZhWqxU/Pp6+2bHH/p40BDrdnWAbRkRN5iE71xY7gyKOKhnsws slosoe9kFgLGb3wt4J6rglQcDezpPDHW X-Google-Smtp-Source: ABdhPJxc2j/d30LFbliRbem66L7CuOMyzlZyrRGCesZ+JnC9QmoojdAvcyujHgWDyq8CQJl8cLQINmB345v+ X-Received: from rananta-virt.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1bcc]) (user=rananta job=sendgmr) by 2002:a17:903:4055:b0:12e:ce88:e896 with SMTP id n21-20020a170903405500b0012ece88e896mr4978961pla.21.1629312207724; Wed, 18 Aug 2021 11:43:27 -0700 (PDT) Date: Wed, 18 Aug 2021 18:43:06 +0000 In-Reply-To: <20210818184311.517295-1-rananta@google.com> Message-Id: <20210818184311.517295-6-rananta@google.com> Mime-Version: 1.0 References: <20210818184311.517295-1-rananta@google.com> X-Mailer: git-send-email 2.33.0.rc1.237.g0d66db33f3-goog Subject: [PATCH v2 05/10] KVM: arm64: selftests: Add basic support to generate delays From: Raghavendra Rao Ananta To: Paolo Bonzini , Marc Zyngier Cc: Alexandru Elisei , Suzuki K Poulose , James Morse , Peter Shier , Ricardo Koller , Oliver Upton , Reiji Watanabe , Jing Zhang , Raghavendra Rao Anata , kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu 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 --- .../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 */