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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 E9E16C433E3 for ; Thu, 20 Aug 2020 00:06:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C34DE207FB for ; Thu, 20 Aug 2020 00:06:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597882009; bh=RlpcFNhQhQeGISJeB07hKfvLDYKsouJijQsNCkkp6Do=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ZSj/nyuzlwaAkOjWTexnPrZV7+N8LFzjNICevvSoH2l7nVJAXx2cpdpoJ8S9zEulK iYMwiW2rmyoU6e+qwB1qmUQZGViHZWiGGt/nHag2Ehk4rxUmUSFB9PlqgCvIgFkwWo zLB4Ofm1uyzrgUANtPoHAKRxgmGwyNunUD+hMw3I= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728327AbgHTADj (ORCPT ); Wed, 19 Aug 2020 20:03:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:32810 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728193AbgHTADS (ORCPT ); Wed, 19 Aug 2020 20:03:18 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id AB3D1208E4; Thu, 20 Aug 2020 00:03:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597881798; bh=RlpcFNhQhQeGISJeB07hKfvLDYKsouJijQsNCkkp6Do=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZeTbH4GQnQEdnhWnGMgXaDPJBum4uMVDKfuNs+ZVUSgtdA7BpRf7c26vgz3yaI8fH Hg5v+KJLMK5YlFwt6Ryj7yJSBswPgSlp+YdMEfPgFZ64+6dW3zG6oeWGEEsa6cG1gm KeTFsZb5qiEgupKgZbRRH7jaZ5MhBm8+NC1F9Yeg= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Srinivas Pandruvada , "Rafael J . Wysocki" , Sasha Levin , linux-pm@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 12/18] cpufreq: intel_pstate: Fix cpuinfo_max_freq when MSR_TURBO_RATIO_LIMIT is 0 Date: Wed, 19 Aug 2020 20:02:55 -0400 Message-Id: <20200820000302.215560-12-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200820000302.215560-1-sashal@kernel.org> References: <20200820000302.215560-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore 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