From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp09.in.ibm.com (e28smtp09.in.ibm.com [122.248.162.9]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 720372C0125 for ; Mon, 10 Mar 2014 22:11:29 +1100 (EST) Received: from /spool/local by e28smtp09.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 10 Mar 2014 16:41:26 +0530 Received: from d28relay05.in.ibm.com (d28relay05.in.ibm.com [9.184.220.62]) by d28dlp02.in.ibm.com (Postfix) with ESMTP id 2997D394005E for ; Mon, 10 Mar 2014 16:41:24 +0530 (IST) Received: from d28av01.in.ibm.com (d28av01.in.ibm.com [9.184.220.63]) by d28relay05.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id s2ABBS2R10158338 for ; Mon, 10 Mar 2014 16:41:28 +0530 Received: from d28av01.in.ibm.com (localhost [127.0.0.1]) by d28av01.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id s2ABBN5k003332 for ; Mon, 10 Mar 2014 16:41:23 +0530 From: "Gautham R. Shenoy" To: linuxppc-dev@ozlabs.org Subject: [PATCH v2 5/6] powernv:cpufreq: Export nominal frequency via sysfs. Date: Mon, 10 Mar 2014 16:41:00 +0530 Message-Id: <1394449861-8688-6-git-send-email-ego@linux.vnet.ibm.com> In-Reply-To: <1394449861-8688-1-git-send-email-ego@linux.vnet.ibm.com> References: <1394449861-8688-1-git-send-email-ego@linux.vnet.ibm.com> Cc: srivatsa.bhat@linux.vnet.ibm.com, "Gautham R. Shenoy" List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: "Gautham R. Shenoy" Create a driver attribute named cpuinfo_nominal_freq which creates a sysfs read-only file named cpuinfo_nominal_freq. Export the frequency corresponding to the nominal_pstate through this interface. Nominal frequency is the highest non-turbo frequency for the platform. This is generally used for setting governor policies from user space for optimal energy efficiency. Signed-off-by: Gautham R. Shenoy --- drivers/cpufreq/powernv-cpufreq.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c index 0ecd163..183bbc4 100644 --- a/drivers/cpufreq/powernv-cpufreq.c +++ b/drivers/cpufreq/powernv-cpufreq.c @@ -142,8 +142,30 @@ static unsigned int pstate_id_to_freq(int pstate_id) return powernv_freqs[i].frequency; } +/** + * show_cpuinfo_nominal_freq - Show the nominal CPU frequency as indicated by + * the firmware + */ +static ssize_t show_cpuinfo_nominal_freq(struct cpufreq_policy *policy, + char *buf) +{ + int nominal_freq; + nominal_freq = pstate_id_to_freq(powernv_pstate_info.pstate_nominal_id); + return sprintf(buf, "%u\n", nominal_freq); +} + + +struct freq_attr cpufreq_freq_attr_cpuinfo_nominal_freq = { + .attr = { .name = "cpuinfo_nominal_freq", + .mode = 0444, + }, + .show = show_cpuinfo_nominal_freq, +}; + + static struct freq_attr *powernv_cpu_freq_attr[] = { &cpufreq_freq_attr_scaling_available_freqs, + &cpufreq_freq_attr_cpuinfo_nominal_freq, NULL, }; -- 1.8.3.1