From patchwork Thu Sep 9 01:38:07 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: 12482211 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 5B604C433F5 for ; Thu, 9 Sep 2021 01:38:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4121A61181 for ; Thu, 9 Sep 2021 01:38:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349781AbhIIBj5 (ORCPT ); Wed, 8 Sep 2021 21:39:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41744 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349698AbhIIBju (ORCPT ); Wed, 8 Sep 2021 21:39:50 -0400 Received: from mail-pg1-x549.google.com (mail-pg1-x549.google.com [IPv6:2607:f8b0:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 61261C06175F for ; Wed, 8 Sep 2021 18:38:42 -0700 (PDT) Received: by mail-pg1-x549.google.com with SMTP id u5-20020a63d3450000b029023a5f6e6f9bso62495pgi.21 for ; Wed, 08 Sep 2021 18:38:42 -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=hjRX/HftaWd94e+jvOSEuHmijk3nZocmEtVUiH9mvr8=; b=DNT8H+P/i3+0pP+A8ae3zx+/69e/d6GKxdp5tnytAlBYxL1bysblA3Z96zvM7faRnp MiPxYxeza9JLHN0GpF4GmSXez3T0p4LoZRVFrVHQYzEr0LcPVUlKEELrUiWxD6I0A9Wm taOxz6ZoahTr8qdnhqB/tnCUY5TNl9VfVe5mDKpPeuQeDd5EQckZgFf63OfLJ5Pvjd0e IM/ym6YPja6fesLQKlJwdRY5BdXDUXU7h6AVrtoCG6Pmgk0KHvtPv9klWAhie36Uqena wWc0B+bDczYGE1Sq2/AfitLnfQKqzh5MeXwN4J65tKUXEmoCgUXw+E0W60fmyDJKwhst rOzg== 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=hjRX/HftaWd94e+jvOSEuHmijk3nZocmEtVUiH9mvr8=; b=n46FwLPR1i36vzR+eo1nIwcAohG2mVQjPaPN5K5r694CVbsrQeYoE7QizemF0BWTiA lZ5VZBsMJO4fwRsxwxWxvFbqA78PPYVW5s9iooCJt05Vu4sBPUxY8/64wo7dJEmJEbES jFfBctONp/YE5jNKF1ot+DUDhld2GgX7ViQJL0u+Db77WKR2oxBAB2ZEqBiKaC9vjgOf p+gDIH5J8FW0IGTH5+7/03llbwQovKI58fdjYXuLLb17H0iz3Z2u11skk8KOkmZQ9M1e xiZCKuo4g3LwHUWcqG7hcGClnIKnufV2a/D+e/Js4m5aynsOkvf+ylGB1bTXhBzdzFn6 nVZQ== X-Gm-Message-State: AOAM5331T3sUnW7j+BQzY4QJH2BAzAIs45O4JUMBigyVKOzY21Zqes78 N1gLvRKvE5eFs0xCfOg1O+QGn7pJSeL7 X-Google-Smtp-Source: ABdhPJyDh2cPwprGNDmaMLhS9RKCSqm8CaY83z9TCFAffNsjqNFL2DJ5xQrC3RTO9+d6S+9VLvSevr3OyarG X-Received: from rananta-virt.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1bcc]) (user=rananta job=sendgmr) by 2002:a17:902:a415:b029:129:5342:eab7 with SMTP id p21-20020a170902a415b02901295342eab7mr420693plq.26.1631151521851; Wed, 08 Sep 2021 18:38:41 -0700 (PDT) Date: Thu, 9 Sep 2021 01:38:07 +0000 In-Reply-To: <20210909013818.1191270-1-rananta@google.com> Message-Id: <20210909013818.1191270-8-rananta@google.com> Mime-Version: 1.0 References: <20210909013818.1191270-1-rananta@google.com> X-Mailer: git-send-email 2.33.0.153.gba50c8fa24-goog Subject: [PATCH v4 07/18] 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 */