This is a note to let you know that I've just added the patch titled
cpufreq: expose scaling_cur_freq sysfs file for set_policy() drivers
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cpufreq-expose-scaling_cur_freq-sysfs-file-for-set_policy-drivers.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c034b02e213d271b98c45c4a7b54af8f69aaac1e Mon Sep 17 00:00:00 2001
From: Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx>
Date: Mon, 13 Oct 2014 08:37:40 -0700
Subject: cpufreq: expose scaling_cur_freq sysfs file for set_policy() drivers
From: Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx>
commit c034b02e213d271b98c45c4a7b54af8f69aaac1e 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@xxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/cpufreq/cpufreq.c | 23 +++++++++++++++++------
1 file changed, 17 insertions(+), 6 deletions(-)
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -460,7 +460,18 @@ show_one(cpuinfo_max_freq, cpuinfo.max_f
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 *policy,
struct cpufreq_policy *new_policy);
@@ -854,11 +865,11 @@ static int cpufreq_add_dev_interface(str
if (ret)
goto err_out_kobj_put;
}
- if (has_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)
Patches currently in stable-queue which might be from dirk.j.brandewie@xxxxxxxxx are
queue-3.14/cpufreq-expose-scaling_cur_freq-sysfs-file-for-set_policy-drivers.patch
queue-3.14/cpufreq-intel_pstate-fix-setting-max_perf_pct-in-performance-policy.patch
queue-3.14/cpufreq-intel_pstate-add-cpu-id-for-braswell-processor.patch
queue-3.14/intel_pstate-add-cpu-ids-for-broadwell-processors.patch
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