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 2C44BC433E1 for ; Mon, 24 Aug 2020 08:47:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EB4D7206F0 for ; Mon, 24 Aug 2020 08:47:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598258826; bh=dCAY1/5cj0Mc5sodwYE/kMvFDeBX4kjWx8QWkQtuaLg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=hlczCdz0JNQcPrWdxTN5SlWw1rqrFYHX0wT4ArxFGuwQ8J5A24nC4X9HKEHhDobfK WUPrtR+ZWYV8d7SahevdHBEJ6raeBL8oeWj0EqAkCV0mFUbRorgvmckLqdN6g3ROcQ 8hiksSENRUwN2lb3RXW0EUbkZ8O6SckySLahuMac= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729411AbgHXIrD (ORCPT ); Mon, 24 Aug 2020 04:47:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:45948 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729399AbgHXIqz (ORCPT ); Mon, 24 Aug 2020 04:46:55 -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 9935B206F0; Mon, 24 Aug 2020 08:46:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598258815; bh=dCAY1/5cj0Mc5sodwYE/kMvFDeBX4kjWx8QWkQtuaLg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tdggkBmVmuGrLtAXogNZT2uPyazUN7i/uA7/4sQCPs6ft+y322zNUs6D1K0Mk8HFo jBSKy3tK7ai9Ths1tCeDJREAKiVkcOZ+BABGq3itqCHFHnfaTev2quwWsGpxYURbm/ +lJdP4di/51g0WyANLomOw0uk2fKXsOb8BypivjA= 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 5.4 055/107] cpufreq: intel_pstate: Fix cpuinfo_max_freq when MSR_TURBO_RATIO_LIMIT is 0 Date: Mon, 24 Aug 2020 10:30:21 +0200 Message-Id: <20200824082407.847242860@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200824082405.020301642@linuxfoundation.org> References: <20200824082405.020301642@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 d3d7c4ef7d045..53dc0fd6f6d3c 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -1571,6 +1571,7 @@ 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