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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A21CCC433EF for ; Tue, 1 Mar 2022 21:14:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238444AbiCAVPk (ORCPT ); Tue, 1 Mar 2022 16:15:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33598 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229744AbiCAVPi (ORCPT ); Tue, 1 Mar 2022 16:15:38 -0500 Received: from mail-wr1-x429.google.com (mail-wr1-x429.google.com [IPv6:2a00:1450:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E567660A9C for ; Tue, 1 Mar 2022 13:14:55 -0800 (PST) Received: by mail-wr1-x429.google.com with SMTP id bk29so5175558wrb.4 for ; Tue, 01 Mar 2022 13:14:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=message-id:date:mime-version:user-agent:subject:content-language:to :cc:references:from:in-reply-to:content-transfer-encoding; bh=21ZpNKZmtS6JPBiLSHjJqzNPL83E2JLLr9bEtvwDEDQ=; b=N36JrrJ95ywm/orOhQxmlD2cenBh7/qOWIj80Xh/pqxDJbOzgFJkN/NBq6JrMUJA5E Ket39SuYBMCgMNmzNL27D0ndZ5xiDOrej/f4pu+tyzTcPaOAKcat1fmzzIUQTSfKFozA J5igyhIAK3nrXF2DiHap/utxdulPzBRi1ZLfEdEM4D66OBOTcfaOTdo8a8vJM+lmMorp qa+cKfduNHANXkmKTiv+fqZ/hmTXj/OLD+YnPOGDLMJUnlpVQfX57VB9zv2+cs5UxaAu JDlz/pMJEddC9Ox5kn1RYSi3pHNcb0f61FfK/2azMPfQw5M0MFg8V8CQhUVMO5u6AOYp ARcg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=21ZpNKZmtS6JPBiLSHjJqzNPL83E2JLLr9bEtvwDEDQ=; b=li0JYmbZVNTM/+zHIEvWJcuGZ4lPBA0jEXAU1XR4XksYm8cQGTKzvqs4VCr+t+d58p SMzJKjJKYD4CfA+REUSQoQEMgI3hdX1z0VEk5GqmqxL83JmGxjeqAG4wzl8XrTt2m70I TowJN4pKNSMESWDXKSrW2c+Jg30bBuRcliuE+7An1L7kufCaiIcnLFSlaeq8weqcx+LR 1ud4L3x5pRb3J9EVjEjgksuL2hd3cXAPz9oOqRRDjGbD+gX5P8C1MxCteXhU3zMNwaNY 4Bsgj9FZj+vTYAK3kAE3Ej/sH8YTmB+AlCqutKeXnCi5cdiurcksxixzR7JED28tWD2e qEBg== X-Gm-Message-State: AOAM532akW63vXYVxRnkhWiXXuXaQlENrQMmrr5vQSW9WtVInYEbu5En 7yxbAvvjqRTNmTHXNdtq2ztEjc5NfhJ/Gg== X-Google-Smtp-Source: ABdhPJz/NzJQfpV+F5/ncYyb4EOEOL40IlDTOJLKtBg9iwn/LvVqEHH3566ZJ78yn36Uyq3VlQ5oEQ== X-Received: by 2002:a05:6000:1565:b0:1ea:6673:c0b5 with SMTP id 5-20020a056000156500b001ea6673c0b5mr20429412wrz.469.1646169294438; Tue, 01 Mar 2022 13:14:54 -0800 (PST) Received: from ?IPV6:2a01:e34:ed2f:f020:49e8:f41b:b2a3:3a55? ([2a01:e34:ed2f:f020:49e8:f41b:b2a3:3a55]) by smtp.googlemail.com with ESMTPSA id az37-20020a05600c602500b0038144e509dfsm3630394wmb.20.2022.03.01.13.14.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 01 Mar 2022 13:14:53 -0800 (PST) Message-ID: <548c9794-12be-f5f0-0cd8-649df695afd9@linaro.org> Date: Tue, 1 Mar 2022 22:14:52 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCH] clocksource/drivers/arm_arch_timer: Use event stream scaling when available Content-Language: en-US To: Marc Zyngier , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Thomas Gleixner , kernel-team@android.com, Mark Rutland References: <20220203170502.2694422-1-maz@kernel.org> From: Daniel Lezcano In-Reply-To: <20220203170502.2694422-1-maz@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/02/2022 18:05, Marc Zyngier wrote: > With FEAT_ECV and the 1GHz counter, it is pretty likely that the > event stream divider doesn't fit in the field that holds the > divider value (we only have 4 bits to describe counter bits [15:0] > > Thankfully, FEAT_ECV also provides a scaling mechanism to switch > the field to cover counter bits [23:8] instead. > > Enable this on arm64 when ECV is available (32bit doesn't have > any detection infrastructure and is unlikely to be run on an > ARMv8.6 system anyway). > > Signed-off-by: Marc Zyngier > Cc: Mark Rutland > Cc: Daniel Lezcano > --- Applied, thanks -- Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog