From patchwork Tue Sep 14 22:31:06 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: 12495009 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 49772C4332F for ; Tue, 14 Sep 2021 22:31:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 321D261164 for ; Tue, 14 Sep 2021 22:31:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235947AbhINWdG (ORCPT ); Tue, 14 Sep 2021 18:33:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39562 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235818AbhINWc4 (ORCPT ); Tue, 14 Sep 2021 18:32:56 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AEDECC061767 for ; Tue, 14 Sep 2021 15:31:38 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id y134-20020a25dc8c000000b0059f0301df0fso857406ybe.21 for ; Tue, 14 Sep 2021 15:31:38 -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=++4XnYRgMyNMsEZoy1OpwZj4635Oms83QujRa32HDH4=; b=BIj10EokpMKVIQvprsrN7AGSS04qrri+1fJcyz+LKoNcHUz6j8rumrXcsiDSnFs74L 9FDCrCun3Ns1u9bqKeeY6R1UBzZHKV3TC7bWqekk9UDFkvxAnqgIAZkKWETHfVfnNJIO V3hPt9oyY+k9HY3GAvt4y5fuYMjBhEHoTb7lT1apdLkLojeyq56RwWjSplDAAgxXXSXz k72BBzzUlAYpu8xxAEVAtyh699qXYz7ZFlfDQ1dLvloxD2CtrwRjAZHg+snteBBYW3sA LrqQ4rXsno5KpGxAbJWg5DroQw0n1PtxFlJ5gy/AFbhGWS37uQgYCsDnV0idazo6jKiS dHzA== 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=++4XnYRgMyNMsEZoy1OpwZj4635Oms83QujRa32HDH4=; b=THBU924nrvDwFSVERajV3UI3DMZEQ1Scr+ze2AH5FhP8avCRW4Rnrsm/Uo3hTZUMpF 1w/yo4TDtY1zAR91q1I8AIK53SN0KF6EPK3BAhx8+PxgYnAv5tQ91ILxQ2WIHPYJQ0G4 zxf3GZ060J3i8wJG/2F8XprpFUsqjfnYAUWpFPStlAoAKz2vrPKdkdxespq6cMhhzdiX ebzWc6k7Q7UBnu6KlKRUOhebRmNOLKWtoaP2I846OPZ90Y5SLhMf/kLyp73NQcvF2xGP 5d5zv8oBNdelnPP3Z8EOGAvx7j6T63+WVdwYofPBX1JRYtDL7q2Xx6YRHr7BPH5G6dpE 3vPw== X-Gm-Message-State: AOAM530pcIlieoBkBrWJoqBLS2XEevX22MHXi+XyPKqOp9zgXS4576dJ U/UqzQZouFqQ/z5p8NzLD4Yb8HyABrFA X-Google-Smtp-Source: ABdhPJwg1l1wqrNj3CGGHgoFxWtUJBru+go0+LCOPCPO8I6WcM88fBLT6JZsKkfu7HZGdHrfNtOrseuPhlcy X-Received: from rananta-virt.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1bcc]) (user=rananta job=sendgmr) by 2002:a25:c9c5:: with SMTP id z188mr2033066ybf.223.1631658697938; Tue, 14 Sep 2021 15:31:37 -0700 (PDT) Date: Tue, 14 Sep 2021 22:31:06 +0000 In-Reply-To: <20210914223114.435273-1-rananta@google.com> Message-Id: <20210914223114.435273-8-rananta@google.com> Mime-Version: 1.0 References: <20210914223114.435273-1-rananta@google.com> X-Mailer: git-send-email 2.33.0.309.g3052b89438-goog Subject: [PATCH v7 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: 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 */