From mboxrd@z Thu Jan 1 00:00:00 1970 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BC356C433F5 for ; Thu, 7 Oct 2021 23:35:10 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 73ABA6137C for ; Thu, 7 Oct 2021 23:35:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 73ABA6137C Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 1A59A4B1DA; Thu, 7 Oct 2021 19:35:10 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@google.com Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WXqCLX1Y3CJL; Thu, 7 Oct 2021 19:35:08 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id B24424B25E; Thu, 7 Oct 2021 19:35:08 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 72F934B19D for ; Thu, 7 Oct 2021 19:35:07 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FJPExdhqsPNK for ; Thu, 7 Oct 2021 19:35:06 -0400 (EDT) Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id D4F5C4B1BA for ; Thu, 7 Oct 2021 19:35:05 -0400 (EDT) Received: by mail-pg1-f202.google.com with SMTP id d6-20020a63d646000000b00268d368ead8so587109pgj.6 for ; Thu, 07 Oct 2021 16:35:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=zdzYxOXw6HRBi/j9Q4Djh6DlKsT7KOqy9GkRVsRm4i4=; b=PvCCl4ZEQDsLP+V4LSuwH3sCogQbp1B9/TjEPTV8Nu5kiq6lYaDWIAyAbL60TcCriO TvK03v2M+Fk6kFFH8ucJeeM6OQTB1aTWP1gmvUqjbGltaij4+2MAeHFGuX4HCenQLwzT nNb/riJFKx1B2mLcVjIq+qwj1R8H7LegcugghClZjUKpaskRXhrO4DA6ZdCJfuB/XTnL 62oIU8it2w+FC9kvR7JrAZq4iWZLeYlkl7mTVgjJLhcU+nP2uohiXmICjub5LWvb1ad8 TRrchyPGubtZPJSPWL/JIdDssStNCNcvQo8H2EqT/ReRwJw2ZJutddbBu7KoJPNit/CD +M+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=zdzYxOXw6HRBi/j9Q4Djh6DlKsT7KOqy9GkRVsRm4i4=; b=rp4EKijXxYz0bdRziIFt5R4ohlhaJHiAWA1arRZnQJMkEditeQZkunB55x7tMHT/Ha x5zd5MAebCBSz2S+iUl0YM4OLa0RMHRkozsKRwqHip9UpS5S66jz4NsM88PgWcMkJqkK KY77i9uI5GCo8AgMGrM998TCv02HeJ90CtHhHJBjVlOHP2+DRlFdxuBGvW3ng0yQVIC2 xhxkYw0CiRk9FFOqXPnkBLHbHPfIp3e2ZeEqkuOIHdM0ARoV4LTNAHDHIWGCt7e6tyL3 THtTHJhnr5BYony/aRmIgegS54+G4W7tmTBfwSkE9IUAnzsNfyiFLg3MvcjC1x7kHvDH XWIQ== X-Gm-Message-State: AOAM532CaRe0UIUnba8C2LaKoLGSRxVaQ8t9V2JwGCJkmk+YxFsd/OUf woSS+BXjj1TLhUnv+7+W0m3e6DTkB3rq X-Google-Smtp-Source: ABdhPJyilhCRZk0a0SoW62S+ez80OkitwK2J0PNfM9M/q/wH8V2CCWfESNfQOqN3LyPJYXZ7p4mJxSOzXVdc X-Received: from rananta-virt.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1bcc]) (user=rananta job=sendgmr) by 2002:a17:902:b093:b029:12c:843:b55a with SMTP id p19-20020a170902b093b029012c0843b55amr6613361plr.83.1633649704900; Thu, 07 Oct 2021 16:35:04 -0700 (PDT) Date: Thu, 7 Oct 2021 23:34:31 +0000 In-Reply-To: <20211007233439.1826892-1-rananta@google.com> Message-Id: <20211007233439.1826892-8-rananta@google.com> Mime-Version: 1.0 References: <20211007233439.1826892-1-rananta@google.com> X-Mailer: git-send-email 2.33.0.882.g93a45727a2-goog Subject: [PATCH v8 07/15] KVM: arm64: selftests: Add basic support to generate delays From: Raghavendra Rao Ananta To: Paolo Bonzini , Marc Zyngier , Andrew Jones , James Morse , Alexandru Elisei , Suzuki K Poulose Cc: kvm@vger.kernel.org, Catalin Marinas , Peter Shier , linux-kernel@vger.kernel.org, Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu 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 */ -- 2.33.0.882.g93a45727a2-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm