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=-12.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 27DCAC433F1 for ; Tue, 28 Jul 2020 07:41:30 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EE46321D95 for ; Tue, 28 Jul 2020 07:41:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="tfsCOzPt" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EE46321D95 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=IL5BOrHglAG1wAPUVmQff25nJI+hKt8Cpo+qpbhch9U=; b=tfsCOzPt95cM4me2H2Oe29t8T 5mc5AA4a8JO9ZvRbCS33YAbGcf9lmanj8/Fvzk6l100njsrHYOlGq7bl2SiPGxm6pEd8FOEr+TqSC Rra0GaJYMo/7LQQP3D4KWdAlP/jVWzf/51lsEAtUG0bU65NXhQbgtXIOaszvPsPPViWjE3FCl1UG4 tfPLy0Qe3EJ2ekc54kfqZ2E+PUEwoCZO5QZMe8DNjuAZdBmg3rfq/R2NRGZxpJr9ny1aH2XJI0es2 id6m/DoOtAEE1raY5YIOx0Fmub+9dpaHwMy4fUSlR4NYN+w+nukAowQ9xNSBXE+XNpHkG4JKIEIgI rVTfNNdag==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1k0KDb-0002oj-5K; Tue, 28 Jul 2020 07:40:11 +0000 Received: from szxga06-in.huawei.com ([45.249.212.32] helo=huawei.com) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1k0KDY-0002mq-6s for linux-arm-kernel@lists.infradead.org; Tue, 28 Jul 2020 07:40:09 +0000 Received: from DGGEMS406-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 7A34D52C142BC77B2F15; Tue, 28 Jul 2020 15:39:51 +0800 (CST) Received: from [10.174.187.22] (10.174.187.22) by DGGEMS406-HUB.china.huawei.com (10.3.19.206) with Microsoft SMTP Server id 14.3.487.0; Tue, 28 Jul 2020 15:39:40 +0800 Subject: Re: [RESEND PATCH] drivers: arm arch timer: Correct fault programming of CNTKCTL_EL1.EVNTI To: , , , References: <20200717092104.15428-1-zhukeqian1@huawei.com> From: zhukeqian Message-ID: Date: Tue, 28 Jul 2020 15:39:40 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.7.1 MIME-Version: 1.0 In-Reply-To: <20200717092104.15428-1-zhukeqian1@huawei.com> X-Originating-IP: [10.174.187.22] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200728_034008_517887_24CD1060 X-CRM114-Status: GOOD ( 18.15 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Suzuki K Poulose , Marc Zyngier , James Morse , Catalin Marinas , wanghaibin.wang@huawei.com, Will Deacon Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Friendly ping. Is this an effective bugfix? On 2020/7/17 17:21, Keqian Zhu wrote: > 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) > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel