From patchwork Mon Sep 13 20:49:23 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: 12490775 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 A9B1EC433F5 for ; Mon, 13 Sep 2021 20:50:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 95D6A610FB for ; Mon, 13 Sep 2021 20:50:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242784AbhIMUwD (ORCPT ); Mon, 13 Sep 2021 16:52:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50004 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348193AbhIMUvb (ORCPT ); Mon, 13 Sep 2021 16:51:31 -0400 Received: from mail-pg1-x54a.google.com (mail-pg1-x54a.google.com [IPv6:2607:f8b0:4864:20::54a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1DDC2C0613DE for ; Mon, 13 Sep 2021 13:49:59 -0700 (PDT) Received: by mail-pg1-x54a.google.com with SMTP id d6-20020a63d646000000b00268d368ead8so8031450pgj.6 for ; Mon, 13 Sep 2021 13:49:59 -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=XCvIJVs/DuwD6DVXVIzmTZNaPbpYhKQLqpZ+rykxYdMxB/84Qi3vvYNUM88AonXgYm 3V6M6oTDcFmeLBGC5wdKY8zvWQpQhY0wyzDGjzao2o0kiQeF8MKozUm6aPUJDoNJvQ0v Lmji7B2c73sTFVtY40SkEnXFX4/nn96K40bYLwW1C3pGJ5ybkts2yHh9IuwHH2le2c/F bklsQntTOO03t4HxTTxahmaU0/nj5BytTybtnNuD2k1GS2D8URinNWESa7cXIMFXBD7G 9OnHFMdEybV2SP5svwz3As2tL0s9uOYNxase9+yjgy4dHZZJJIzB8FxgLSP4ZBdHFgbL qNbw== 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=y/zm+v4qiw3ld+tU4cMdgws3tTztZlPubTOHiecD25A1MyTfZOGoxVC5H9Q5m+7HHF OTT4iIRLVBkCjC9daItq9hrn5Rjiyy37J57KI5n0KBowNDqpbTjbqcwgtlQUhRg66VHm 7Gzn3123DxLE6VXlmjf02vA28SS3eDbJwggMXnpPygU0HmTXlTYST36/Y6lixxGMbIF6 7Nyh/Uv5hUtqu6dysC3Q2co9SiqPnJ2jZsCXfx7aLNvOeWksl7Esy32KffXlWA4MXglI FZWmCs0AskFwXD2m2dX8j5miagfpIeLOjwqjRn3l7qfEPf3gZIgmzE/5j75czMpYoGgc wX+w== X-Gm-Message-State: AOAM530x0e2UZclK3/GViFypNcbQuIC0QpIhjUcHVn+1DYjuVIObCXfz IrciFS8agYijbY9mEYHd341utVTybh71 X-Google-Smtp-Source: ABdhPJwfTceLZYDZAwbbgQTF9ZLpvhVdpi6vUBIdVg4ocUiJi21dM3Cwnc6gs258WgslLA9IFf0uYZgYLOjP X-Received: from rananta-virt.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1bcc]) (user=rananta job=sendgmr) by 2002:a05:6a00:1706:b0:434:9def:d275 with SMTP id h6-20020a056a00170600b004349defd275mr1328644pfc.1.1631566198555; Mon, 13 Sep 2021 13:49:58 -0700 (PDT) Date: Mon, 13 Sep 2021 20:49:23 +0000 In-Reply-To: <20210913204930.130715-1-rananta@google.com> Message-Id: <20210913204930.130715-8-rananta@google.com> Mime-Version: 1.0 References: <20210913204930.130715-1-rananta@google.com> X-Mailer: git-send-email 2.33.0.309.g3052b89438-goog Subject: [PATCH v5 07/14] 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 */