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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=2bFB/BrS5gWuto3RDOOdxkDssUGChWEy5jhEkwaMMsPlYHdzqB0MisQsdSEtJMVUpt kZGtS1B7JeGPK8QOIcck+ukIZ6TiEXPoBduy+7D3lzYIGnJUGL1imlvjOttAWvDyiwN4 rGk9XKAyEMIaF6o9KvSFqk7LULgJMmn0BC3cu+VFHae6pm6l+/iBDLHfWXI+39+yKen9 ZEhfG64ov1O62nxDXVwP4cW9dKNdqg7p2cITJjiMQlCOhKhaQvUiz6ObHRtCuZlrB+3h wA45W8rk9xvYX4NhQKy0anpl3hxfOQ5g/jUUdgLG4wE/30CnHtf7l+AE2O965qKclaNx xsBg== X-Gm-Message-State: AOAM530DTTbVdmWsYeE6fDQqtgUPv8Le3nTNOpbe3bbz7tRFTMcEluzt gosMzrfYffe+csAQLCnk+RT96kLe95Ev 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210914_153139_616433_296B1E8A X-CRM114-Status: GOOD ( 11.83 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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 */