From: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
To: linuxppc-dev@ozlabs.org, linux-pm@vger.kernel.org
Cc: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
Subject: [PATCH v3 4/5] powernv:cpufreq: Export nominal frequency via sysfs.
Date: Thu, 20 Mar 2014 17:40:59 +0530 [thread overview]
Message-ID: <1395317460-14811-5-git-send-email-ego@linux.vnet.ibm.com> (raw)
In-Reply-To: <1395317460-14811-1-git-send-email-ego@linux.vnet.ibm.com>
From: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
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 <ego@linux.vnet.ibm.com>
---
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 e7b0292..46bee8a 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
next prev parent reply other threads:[~2014-03-20 12:11 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-20 12:10 [PATCH v3 0/5] powernv: Enable Dynamic Frequency Gautham R. Shenoy
2014-03-20 12:10 ` [PATCH v3 1/5] powernv: cpufreq driver for powernv platform Gautham R. Shenoy
2014-03-21 8:41 ` Viresh Kumar
2014-03-21 10:43 ` Gautham R Shenoy
2014-03-21 10:54 ` Viresh Kumar
2014-03-21 11:40 ` Srivatsa S. Bhat
2014-03-21 13:23 ` Gautham R Shenoy
2014-03-21 13:34 ` Viresh Kumar
2014-03-21 14:54 ` Gautham R Shenoy
2014-03-22 3:43 ` Viresh Kumar
2014-03-21 14:48 ` Vaidyanathan Srinivasan
2014-03-22 3:43 ` Viresh Kumar
2014-03-21 11:45 ` Srivatsa S. Bhat
2014-03-21 11:47 ` Viresh Kumar
2014-03-20 12:10 ` [PATCH v3 2/5] powernv, cpufreq:Add per-core locking to serialize frequency transitions Gautham R. Shenoy
2014-03-21 6:24 ` Gautham R Shenoy
2014-03-21 8:42 ` Viresh Kumar
2014-03-21 9:56 ` Srivatsa S. Bhat
2014-03-20 12:10 ` [PATCH v3 3/5] powernv:cpufreq: Create pstate_id_to_freq() helper Gautham R. Shenoy
2014-03-21 6:24 ` Gautham R Shenoy
2014-03-20 12:10 ` Gautham R. Shenoy [this message]
2014-03-21 8:47 ` [PATCH v3 4/5] powernv:cpufreq: Export nominal frequency via sysfs Viresh Kumar
2014-03-21 9:55 ` Gautham R Shenoy
2014-03-21 9:57 ` Viresh Kumar
2014-03-20 12:11 ` [PATCH v3 5/5] powernv:cpufreq: Implement the driver->get() method Gautham R. Shenoy
2014-03-21 6:25 ` Gautham R Shenoy
2014-03-21 9:31 ` Viresh Kumar
2014-03-21 11:04 ` Gautham R Shenoy
2014-03-21 11:45 ` Viresh Kumar
2014-03-21 12:01 ` David Laight
2014-03-21 12:31 ` Gautham R Shenoy
2014-03-21 12:34 ` Viresh Kumar
2014-03-21 15:01 ` David Laight
2014-03-21 13:04 ` Gautham R Shenoy
2014-03-21 13:12 ` Viresh Kumar
2014-03-21 14:25 ` Gautham R Shenoy
2014-03-21 22:56 ` Benjamin Herrenschmidt
2014-03-22 7:53 ` Gautham R Shenoy
2014-03-21 7:46 ` [PATCH v3 0/5] powernv: Enable Dynamic Frequency Viresh Kumar
2014-03-21 8:19 ` Gautham R Shenoy
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