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=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 CDD4FC433E1 for ; Mon, 24 Aug 2020 08:40:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 94D4B2075B for ; Mon, 24 Aug 2020 08:40:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598258455; bh=qIN9iri9QNfy/KZFqXfOtLmo6m1lKdco5QEV4ggVQxM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=iJTDGWHq4fRpgD9H6O7IYTmNGgbqwlBa0wvMD1hOa7oc+0TzGRGbq0pFWN0yb7sJr H9dXx25ldGdq/9d8A/ixcsKpoNySaj2R10JqMRq1hbkgJCCx+lMTQtU3ZprZuzza8N 5LN9sSEZwzn9TahoCHWfv7BUJO+PQrMn3imEgRKA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728790AbgHXIkx (ORCPT ); Mon, 24 Aug 2020 04:40:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:58094 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728747AbgHXIkr (ORCPT ); Mon, 24 Aug 2020 04:40:47 -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 9D2D62074D; Mon, 24 Aug 2020 08:40:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598258447; bh=qIN9iri9QNfy/KZFqXfOtLmo6m1lKdco5QEV4ggVQxM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Q8OfAEzgHqGy8QK31Ea7ObKuABiIW+Mjvd8ydQSF0lYrWUa/TmQGLc9ADhqPTKpvB TEUgVFpN6LgG08nSU07dnEFYCQmNsh+M3XdrOR0JweEFbZ8YNynXENONbIFvGNejg7 zHWzHanb3gab2ea+Xa3JwsRtFwawVn3zTqbcQ7/g= 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 5.7 051/124] cpufreq: intel_pstate: Fix cpuinfo_max_freq when MSR_TURBO_RATIO_LIMIT is 0 Date: Mon, 24 Aug 2020 10:29:45 +0200 Message-Id: <20200824082411.929783239@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200824082409.368269240@linuxfoundation.org> References: <20200824082409.368269240@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 4d3429b2058fc..8c4d86032c7a3 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -1572,6 +1572,7 @@ 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