From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 26C151A2BD6 for ; Mon, 14 Sep 2015 20:28:16 +1000 (AEST) Received: from mail-pa0-f48.google.com (mail-pa0-f48.google.com [209.85.220.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id A80B91401AD for ; Mon, 14 Sep 2015 20:28:15 +1000 (AEST) Received: by pacex6 with SMTP id ex6so141089946pac.0 for ; Mon, 14 Sep 2015 03:28:13 -0700 (PDT) Date: Mon, 14 Sep 2015 15:58:09 +0530 From: Viresh Kumar To: Shilpasri G Bhat Cc: rjw@rjwysocki.net, linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Subject: Re: [PATCH v2] cpufreq : powernv: Report Pmax throttling if capped below nominal frequency Message-ID: <20150914102809.GD32551@linux> References: <1442207874-5016-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> <1442219507-6499-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <1442219507-6499-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On 14-09-15, 14:01, Shilpasri G Bhat wrote: > Log a 'critical' message if the max frequency is reduced below nominal > frequency. We already log 'info' message if the max frequency is > capped below turbo frequency. CPU should guarantee atleast nominal > frequency, but not turbo frequency in all system configurations and > environments. So report the pmax throttling with severity when Pmax is > dipped below nominal frequency. > > Signed-off-by: Shilpasri G Bhat > --- > Changes from v1: > - Modified the printk messages as per Viresh's suggestion. > > drivers/cpufreq/powernv-cpufreq.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c > index 64994e1..cb50138 100644 > --- a/drivers/cpufreq/powernv-cpufreq.c > +++ b/drivers/cpufreq/powernv-cpufreq.c > @@ -327,8 +327,14 @@ static void powernv_cpufreq_throttle_check(void *data) > if (chips[i].throttled) > goto next; > chips[i].throttled = true; > - pr_info("CPU %d on Chip %u has Pmax reduced to %d\n", cpu, > - chips[i].id, pmsr_pmax); > + if (pmsr_pmax < powernv_pstate_info.nominal) > + pr_crit("CPU %d on Chip %u has Pmax reduced below nominal frequency (%d < %d)\n", > + cpu, chips[i].id, pmsr_pmax, > + powernv_pstate_info.nominal); > + else > + pr_info("CPU %d on Chip %u has Pmax reduced below turbo frequency (%d < %d)\n", > + cpu, chips[i].id, pmsr_pmax, > + powernv_pstate_info.max); > } else if (chips[i].throttled) { > chips[i].throttled = false; > pr_info("CPU %d on Chip %u has Pmax restored to %d\n", cpu, Acked-by: Viresh Kumar -- viresh