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cpufreq: expose scaling_cur_freq sysfs file for set_policy() drivers

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commit c034b02e21 upstream.

Currently the core does not expose scaling_cur_freq for set_policy()
drivers this breaks some userspace monitoring tools.
Change the core to expose this file for all drivers and if the
set_policy() driver supports the get() callback use it to retrieve the
current frequency.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=73741
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Dirk Brandewie 2014-10-13 08:37:40 -07:00 committed by Zefan Li
parent e930516632
commit aea44610e1
1 changed files with 17 additions and 6 deletions
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23
drivers/cpufreq/cpufreq.c
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@ -371,7 +371,18 @@ show_one(cpuinfo_max_freq, cpuinfo.max_freq);
show_one(cpuinfo_transition_latency, cpuinfo.transition_latency);
show_one(scaling_min_freq, min);
show_one(scaling_max_freq, max);
show_one(scaling_cur_freq, cur);
static ssize_t show_scaling_cur_freq(
struct cpufreq_policy *policy, char *buf)
{
ssize_t ret;
if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get)
ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu));
else
ret = sprintf(buf, "%u\n", policy->cur);
return ret;
}
static int __cpufreq_set_policy(struct cpufreq_policy *data,
struct cpufreq_policy *policy);
@ -818,11 +829,11 @@ static int cpufreq_add_dev_interface(unsigned int cpu,
if (ret)
goto err_out_kobj_put;
}
if (cpufreq_driver->target) {
ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr);
if (ret)
goto err_out_kobj_put;
}
ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr);
if (ret)
goto err_out_kobj_put;
if (cpufreq_driver->bios_limit) {
ret = sysfs_create_file(&policy->kobj, &bios_limit.attr);
if (ret)