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 X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 091F5C433E0 for ; Fri, 3 Jul 2020 07:46:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D645C2064B for ; Fri, 3 Jul 2020 07:46:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="h23w2HAB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726675AbgGCHqB (ORCPT ); Fri, 3 Jul 2020 03:46:01 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:32025 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725779AbgGCHqA (ORCPT ); Fri, 3 Jul 2020 03:46:00 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1593762358; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=svaBVRBSIxn/zApRlrGVfk5FjuBOJPoIWjV60nWSuWc=; b=h23w2HAB8PbNaL0OjtLhfNbGPTCvwI5KocMVOVMRg4MfIzEbpvrATkld0S8zk95zOG7F9i bMSIX0T01PTiHbUICmGx6Qhwx4aVFXRDMtJCPG/jAw9bpgEVbh56d46S8R7Y98QTI91wE/ C4wPpBtHxViYgEHD+MmTZ/wvfz+x2yI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-140-R-k6Uxd2MQyU2O1h0UxpBA-1; Fri, 03 Jul 2020 03:45:56 -0400 X-MC-Unique: R-k6Uxd2MQyU2O1h0UxpBA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0473E10506E1; Fri, 3 Jul 2020 07:45:55 +0000 (UTC) Received: from [10.36.112.70] (ovpn-112-70.ams2.redhat.com [10.36.112.70]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 0BC2B6111F; Fri, 3 Jul 2020 07:45:52 +0000 (UTC) Subject: Re: [kvm-unit-tests PATCH v2 8/8] arm64: microbench: Add vtimer latency test To: Jingyi Wang , drjones@redhat.com, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Cc: maz@kernel.org, wanghaibin.wang@huawei.com, yuzenghui@huawei.com References: <20200702030132.20252-1-wangjingyi11@huawei.com> <20200702030132.20252-9-wangjingyi11@huawei.com> <88eacd00-1951-f6de-aa7c-bda48ece4fde@redhat.com> <5a43242d-2c0b-d8d1-b12d-7436e7d03e52@huawei.com> From: Auger Eric Message-ID: Date: Fri, 3 Jul 2020 09:45:51 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <5a43242d-2c0b-d8d1-b12d-7436e7d03e52@huawei.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Hi Jingyi, On 7/3/20 9:41 AM, Jingyi Wang wrote: > Hi Eric, Drew, > > On 7/2/2020 9:36 PM, Auger Eric wrote: >> Hi Jingyi, >> >> On 7/2/20 5:01 AM, Jingyi Wang wrote: >>> Trigger PPIs by setting up a 10msec timer and test the latency. >> >> so for each iteration the accumulated valued is 10 ms + latency, right? >> and what is printed at the end does include the accumulated periods. >> Wouldn't it make sense to have a test->post() that substract this value. >> You would need to store the actual number of iterations. >> >> Thanks >> >> Eric > > That's right, the result indicates 10ms + latency, which is a 10msec > timer actually costs. I think using the difference instead of the total > time cost can be a little confusing here. Maybe we can use test->post() > to get the latency and print an extra result in logs? Do you have any > opinions on that? for other interrupts you only print the latency, right? Here if I understand correctly you use the timer to trigger the PPI but still you care about the latency, hence my suggestion to only print the latency. Thanks Eric > > Thanks, > Jingyi > >>> >>> Signed-off-by: Jingyi Wang >>> --- >>>   arm/micro-bench.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++- >>>   1 file changed, 55 insertions(+), 1 deletion(-) >>> >>> diff --git a/arm/micro-bench.c b/arm/micro-bench.c >>> index 4c962b7..6822084 100644 >>> --- a/arm/micro-bench.c >>> +++ b/arm/micro-bench.c >>> @@ -23,8 +23,13 @@ >>>   #include >>>     #define NTIMES (1U << 16) >>> +#define NTIMES_MINOR (1U << 8) >>>   #define MAX_NS (5 * 1000 * 1000 * 1000UL) >>>   +#define IRQ_VTIMER        27 >>> +#define ARCH_TIMER_CTL_ENABLE    (1 << 0) >>> +#define ARCH_TIMER_CTL_IMASK    (1 << 1) >>> + >>>   static u32 cntfrq; >>>     static volatile bool irq_ready, irq_received; >>> @@ -33,9 +38,16 @@ static void (*write_eoir)(u32 irqstat); >>>     static void gic_irq_handler(struct pt_regs *regs) >>>   { >>> +    u32 irqstat = gic_read_iar(); >>>       irq_ready = false; >>>       irq_received = true; >>> -    gic_write_eoir(gic_read_iar()); >>> +    gic_write_eoir(irqstat); >>> + >>> +    if (irqstat == IRQ_VTIMER) { >>> +        write_sysreg((ARCH_TIMER_CTL_IMASK | ARCH_TIMER_CTL_ENABLE), >>> +                 cntv_ctl_el0); >>> +        isb(); >>> +    } >>>       irq_ready = true; >>>   } >>>   @@ -189,6 +201,47 @@ static void lpi_exec(void) >>>       assert_msg(irq_received, "failed to receive LPI in time, but >>> received %d successfully\n", received); >>>   } >>>   +static bool timer_prep(void) >>> +{ >>> +    static void *gic_isenabler; >>> + >>> +    gic_enable_defaults(); >>> +    install_irq_handler(EL1H_IRQ, gic_irq_handler); >>> +    local_irq_enable(); >>> + >>> +    gic_isenabler = gicv3_sgi_base() + GICR_ISENABLER0; >>> +    writel(1 << 27, gic_isenabler); >>> +    write_sysreg(ARCH_TIMER_CTL_ENABLE, cntv_ctl_el0); >>> +    isb(); >>> + >>> +    gic_prep_common(); >>> +    return true; >>> +} >>> + >>> +static void timer_exec(void) >>> +{ >>> +    u64 before_timer; >>> +    u64 timer_10ms; >>> +    unsigned tries = 1 << 28; >>> +    static int received = 0; >>> + >>> +    irq_received = false; >>> + >>> +    before_timer = read_sysreg(cntvct_el0); >>> +    timer_10ms = cntfrq / 100; >>> +    write_sysreg(before_timer + timer_10ms, cntv_cval_el0); >>> +    write_sysreg(ARCH_TIMER_CTL_ENABLE, cntv_ctl_el0); >>> +    isb(); >>> + >>> +    while (!irq_received && tries--) >>> +        cpu_relax(); >>> + >>> +    if (irq_received) >>> +        ++received; >>> + >>> +    assert_msg(irq_received, "failed to receive PPI in time, but >>> received %d successfully\n", received); >>> +} >>> + >>>   static void hvc_exec(void) >>>   { >>>       asm volatile("mov w0, #0x4b000000; hvc #0" ::: "w0"); >>> @@ -236,6 +289,7 @@ static struct exit_test tests[] = { >>>       {"ipi",            ipi_prep,    ipi_exec,        NTIMES,        >>> true}, >>>       {"ipi_hw",        ipi_hw_prep,    ipi_exec,        >>> NTIMES,        true}, >>>       {"lpi",            lpi_prep,    lpi_exec,        NTIMES,        >>> true}, >>> +    {"timer_10ms",        timer_prep,    timer_exec,        >>> NTIMES_MINOR,    true}, >>>   }; >>>     struct ns_time { >>> >> >> >> . >> > 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 X-Spam-Level: X-Spam-Status: No, score=-8.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 A9045C433E1 for ; Fri, 3 Jul 2020 07:46:02 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 3DD942064B for ; Fri, 3 Jul 2020 07:46:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification 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b=h23w2HAB8PbNaL0OjtLhfNbGPTCvwI5KocMVOVMRg4MfIzEbpvrATkld0S8zk95zOG7F9i bMSIX0T01PTiHbUICmGx6Qhwx4aVFXRDMtJCPG/jAw9bpgEVbh56d46S8R7Y98QTI91wE/ C4wPpBtHxViYgEHD+MmTZ/wvfz+x2yI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-140-R-k6Uxd2MQyU2O1h0UxpBA-1; Fri, 03 Jul 2020 03:45:56 -0400 X-MC-Unique: R-k6Uxd2MQyU2O1h0UxpBA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0473E10506E1; Fri, 3 Jul 2020 07:45:55 +0000 (UTC) Received: from [10.36.112.70] (ovpn-112-70.ams2.redhat.com [10.36.112.70]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 0BC2B6111F; Fri, 3 Jul 2020 07:45:52 +0000 (UTC) Subject: Re: [kvm-unit-tests PATCH v2 8/8] arm64: microbench: Add vtimer latency test To: Jingyi Wang , drjones@redhat.com, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu References: <20200702030132.20252-1-wangjingyi11@huawei.com> <20200702030132.20252-9-wangjingyi11@huawei.com> <88eacd00-1951-f6de-aa7c-bda48ece4fde@redhat.com> <5a43242d-2c0b-d8d1-b12d-7436e7d03e52@huawei.com> From: Auger Eric Message-ID: Date: Fri, 3 Jul 2020 09:45:51 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <5a43242d-2c0b-d8d1-b12d-7436e7d03e52@huawei.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Cc: maz@kernel.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="utf-8" Content-Transfer-Encoding: base64 Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu 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