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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 797DBC433E1 for ; Fri, 17 Jul 2020 09:21:30 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 043C420691 for ; Fri, 17 Jul 2020 09:21:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 043C420691 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 534584B313; Fri, 17 Jul 2020 05:21:29 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bJwqOppovYQz; Fri, 17 Jul 2020 05:21:28 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 5A64B4B314; Fri, 17 Jul 2020 05:21:28 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 834714B30E for ; Fri, 17 Jul 2020 05:21:27 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SmXD6GRmU00L for ; Fri, 17 Jul 2020 05:21:26 -0400 (EDT) Received: from huawei.com (szxga05-in.huawei.com [45.249.212.191]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 06E014B309 for ; Fri, 17 Jul 2020 05:21:25 -0400 (EDT) Received: from DGGEMS409-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 73228D0B5AF77BBC20AC; Fri, 17 Jul 2020 17:21:21 +0800 (CST) Received: from DESKTOP-5IS4806.china.huawei.com (10.174.187.22) by DGGEMS409-HUB.china.huawei.com (10.3.19.209) with Microsoft SMTP Server id 14.3.487.0; Fri, 17 Jul 2020 17:21:12 +0800 From: Keqian Zhu To: , , , Subject: [RESEND PATCH] drivers: arm arch timer: Correct fault programming of CNTKCTL_EL1.EVNTI Date: Fri, 17 Jul 2020 17:21:04 +0800 Message-ID: <20200717092104.15428-1-zhukeqian1@huawei.com> X-Mailer: git-send-email 2.8.4.windows.1 MIME-Version: 1.0 X-Originating-IP: [10.174.187.22] X-CFilter-Loop: Reflected Cc: Marc Zyngier , Catalin Marinas , Will Deacon 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="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu ARM virtual counter supports event stream. It can only trigger an event when the trigger bit of CNTVCT_EL0 changes from 0 to 1 (or from 1 to 0), so the actual period of event stream is 2 ^ (cntkctl_evnti + 1). For example, when the trigger bit is 0, then it triggers an event for every two cycles. Signed-off-by: Keqian Zhu --- drivers/clocksource/arm_arch_timer.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index ecf7b7db2d05..06d99a4b1b9b 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -799,10 +799,20 @@ static void __arch_timer_setup(unsigned type, static void arch_timer_evtstrm_enable(int divider) { u32 cntkctl = arch_timer_get_cntkctl(); + int cntkctl_evnti; + + /* + * Note that it can only trigger an event when the trigger bit + * of CNTVCT_EL0 changes from 1 to 0 (or from 0 to 1), so the + * actual period of event stream is 2 ^ (cntkctl_evnti + 1). + */ + cntkctl_evnti = divider - 1; + cntkctl_evnti = min(cntkctl_evnti, 15); + cntkctl_evnti = max(cntkctl_evnti, 0); cntkctl &= ~ARCH_TIMER_EVT_TRIGGER_MASK; /* Set the divider and enable virtual event stream */ - cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT) + cntkctl |= (cntkctl_evnti << ARCH_TIMER_EVT_TRIGGER_SHIFT) | ARCH_TIMER_VIRT_EVT_EN; arch_timer_set_cntkctl(cntkctl); arch_timer_set_evtstrm_feature(); @@ -816,10 +826,11 @@ static void arch_timer_configure_evtstream(void) /* Find the closest power of two to the divisor */ evt_stream_div = arch_timer_rate / ARCH_TIMER_EVT_STREAM_FREQ; pos = fls(evt_stream_div); - if (pos > 1 && !(evt_stream_div & (1 << (pos - 2)))) + if ((pos == 1) || (pos > 1 && !(evt_stream_div & (1 << (pos - 2))))) pos--; + /* enable event stream */ - arch_timer_evtstrm_enable(min(pos, 15)); + arch_timer_evtstrm_enable(pos); } static void arch_counter_set_user_access(void) -- 2.19.1 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm