From: Pan Xinhui <xinhuix....@intel.com>
Userspace at most time do cpufreq tests very much inconveniently.
Currently they have to echo min and max cpu freq separately like below:
echo 480000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
echo 2240000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
Add scaling_freq_range cpufreq attr to support userspace's demand.
Therefore it's easier for testers to write readable scripts like below:
echo 480000-2240000 >
/sys/devices/system/cpu/cpu0/cpufreq/scaling_freq_range
Signed-off-by: Pan Xinhui <xinhuix....@intel.com>
---
drivers/cpufreq/cpufreq.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 26063af..6424e05 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -812,6 +812,35 @@ static ssize_t show_bios_limit(struct cpufreq_policy
*policy, char *buf)
return sprintf(buf, "%u\n", policy->cpuinfo.max_freq);
}
+static ssize_t store_scaling_freq_range(struct cpufreq_policy *policy,
+ char *buf, size_t count)
+{
+ int ret, temp_min, temp_max;
+ struct cpufreq_policy new_policy;
+
+ ret = cpufreq_get_policy(&new_policy, policy->cpu);
+ if (ret)
+ return -EINVAL;
+
+ ret = sscanf(buf, "%u-%u", &new_policy.min, &new_policy.max);
+ if (ret != 2)
+ return -EINVAL;
+
+ temp_min = new_policy.min;
+ temp_max = new_policy.max;
+ ret = cpufreq_set_policy(policy, &new_policy);
+ if (!ret) {
+ policy->user_policy.min = temp_min;
+ policy->user_policy.max = temp_max;
+ }
+ return ret ? ret : count;
+}
+
+static ssize_t show_scaling_freq_range(struct cpufreq_policy *policy, char
*buf)
+{
+ return sprintf(buf, "%u-%u\n", policy->min, policy->max);
+}
+
cpufreq_freq_attr_ro_perm(cpuinfo_cur_freq, 0400);
cpufreq_freq_attr_ro(cpuinfo_min_freq);
cpufreq_freq_attr_ro(cpuinfo_max_freq);
@@ -826,6 +855,7 @@ cpufreq_freq_attr_rw(scaling_min_freq);
cpufreq_freq_attr_rw(scaling_max_freq);
cpufreq_freq_attr_rw(scaling_governor);
cpufreq_freq_attr_rw(scaling_setspeed);
+cpufreq_freq_attr_rw(scaling_freq_range);
static struct attribute *default_attrs[] = {
&cpuinfo_min_freq.attr,
@@ -839,6 +869,7 @@ static struct attribute *default_attrs[] = {
&scaling_driver.attr,
&scaling_available_governors.attr,
&scaling_setspeed.attr,
+ &scaling_freq_range.attr,
NULL
};
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
