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=-13.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,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 D1E1CC433DF for ; Mon, 24 Aug 2020 09:14:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A9082072D for ; Mon, 24 Aug 2020 09:14:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598260448; bh=RlpcFNhQhQeGISJeB07hKfvLDYKsouJijQsNCkkp6Do=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=UbRgpZ4SWFKqDogvwvXAkVi5ZmCZpP+Img8fDrQ6yQLCJzjWiiunvBPKM3UHFnNkn /h9actQBLqWhlzus1/c3gC1fAK5dSIUYa5i979hALxvlZhzkRU4rvkCqbe3okKGST5 6JNlxr7ldpZZ2yuyJ/jsoVq5+7rXLAfu98Jmo+e0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728995AbgHXJOH (ORCPT ); Mon, 24 Aug 2020 05:14:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:39824 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730457AbgHXI4G (ORCPT ); Mon, 24 Aug 2020 04:56:06 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8F98C2074D; Mon, 24 Aug 2020 08:56:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598259366; bh=RlpcFNhQhQeGISJeB07hKfvLDYKsouJijQsNCkkp6Do=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sPspAhriKnoCRZWC1c/cYEVxLLB1pqHx1aw663sxXbOscjA9F2LK2+dEVr/NYfoWK 2GsNlzxppOlZS1DAMChW/9hQt+H5jm6Bz26j8r/wXvA+HKSUz4wCwdvJa6Ho8oixBs nhflSxeNHSXknr3oW1cGYL5k9DbzYr05CQyvDKRI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Srinivas Pandruvada , "Rafael J. Wysocki" , Sasha Levin Subject: [PATCH 4.19 32/71] cpufreq: intel_pstate: Fix cpuinfo_max_freq when MSR_TURBO_RATIO_LIMIT is 0 Date: Mon, 24 Aug 2020 10:31:23 +0200 Message-Id: <20200824082357.496305936@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200824082355.848475917@linuxfoundation.org> References: <20200824082355.848475917@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Srinivas Pandruvada [ Upstream commit 4daca379c703ff55edc065e8e5173dcfeecf0148 ] The MSR_TURBO_RATIO_LIMIT can be 0. This is not an error. User can update this MSR via BIOS settings on some systems or can use msr tools to update. Also some systems boot with value = 0. This results in display of cpufreq/cpuinfo_max_freq wrong. This value will be equal to cpufreq/base_frequency, even though turbo is enabled. But platform will still function normally in HWP mode as we get max 1-core frequency from the MSR_HWP_CAPABILITIES. This MSR is already used to calculate cpu->pstate.turbo_freq, which is used for to set policy->cpuinfo.max_freq. But some other places cpu->pstate.turbo_pstate is used. For example to set policy->max. To fix this, also update cpu->pstate.turbo_pstate when updating cpu->pstate.turbo_freq. Signed-off-by: Srinivas Pandruvada Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin --- drivers/cpufreq/intel_pstate.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index e7b3d4ed8eff4..99166000ffb77 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -1431,6 +1431,7 @@ static void intel_pstate_get_cpu_pstates(struct cpudata *cpu) intel_pstate_get_hwp_max(cpu->cpu, &phy_max, ¤t_max); cpu->pstate.turbo_freq = phy_max * cpu->pstate.scaling; + cpu->pstate.turbo_pstate = phy_max; } else { cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * cpu->pstate.scaling; } -- 2.25.1