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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 D552EC43381 for ; Wed, 27 Mar 2019 18:51:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A70022087C for ; Wed, 27 Mar 2019 18:51:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553712692; bh=4f5viTNzpmahN0J+KccMA3JO5oToOiMTwtHmZ8f34Zs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=tcT0aydUuN5qYRj09KFTivEqbwF/z2CSFa8pqDLZh2S+Ppn0g/RfoTQpjk30QbUDp o1GLQI7ccI5ys4djFzrC1gAyj/y8SZEZGky3z8sJsyMpP8Ln8fVbjDRmvwEAF5LtI9 3+Cs+1Jh0wKkiG1A32XiPMWgz78er5t9DFwtPlpQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391003AbfC0Sv0 (ORCPT ); Wed, 27 Mar 2019 14:51:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:34632 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389815AbfC0SSA (ORCPT ); Wed, 27 Mar 2019 14:18:00 -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 1AC4A217F9; Wed, 27 Mar 2019 18:17:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553710679; bh=4f5viTNzpmahN0J+KccMA3JO5oToOiMTwtHmZ8f34Zs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=f9wJu6Z4rfushM32ywgahThtPn0kff1OoxxIX2MsgoP+aqMy+o8XclF1pA3gTicE1 CDZh4lm/F2fYUZPgIe308ij++is4ymnpJ+8DVKqtNtrBYIo7Cp9SRN0megC9C+kiB2 hb5lRLCN8PaVRRVlonak3qh7H/o2K136LSmztFMY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Erwan Velu , Erwan Velu , "Rafael J . Wysocki" , Sasha Levin , linux-pm@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 050/123] cpufreq: acpi-cpufreq: Report if CPU doesn't support boost technologies Date: Wed, 27 Mar 2019 14:15:14 -0400 Message-Id: <20190327181628.15899-50-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190327181628.15899-1-sashal@kernel.org> References: <20190327181628.15899-1-sashal@kernel.org> MIME-Version: 1.0 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: Erwan Velu [ Upstream commit 1222d527f314c86a3b59a522115d62facc5a7965 ] There is some rare cases where CPB (and possibly IDA) are missing on processors. This is the case fixed by commit f7f3dc00f612 ("x86/cpu/AMD: Fix erratum 1076 (CPB bit)") and following. In such context, the boost status isn't reported by /sys/devices/system/cpu/cpufreq/boost. This commit is about printing a message to report that the CPU doesn't expose the boost capabilities. This message could help debugging platforms hit by this phenomena. Signed-off-by: Erwan Velu [ rjw: Change the message text somewhat ] Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin --- drivers/cpufreq/acpi-cpufreq.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c index d0c34df0529c..51a3c15ace09 100644 --- a/drivers/cpufreq/acpi-cpufreq.c +++ b/drivers/cpufreq/acpi-cpufreq.c @@ -909,8 +909,10 @@ static void __init acpi_cpufreq_boost_init(void) { int ret; - if (!(boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA))) + if (!(boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA))) { + pr_debug("Boost capabilities not present in the processor\n"); return; + } acpi_cpufreq_driver.set_boost = set_boost; acpi_cpufreq_driver.boost_enabled = boost_state(0); -- 2.19.1