From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wei Ni Subject: [[PATCH v2]] thermal: add available policies sysfs attribute Date: Fri, 8 May 2015 10:47:11 +0800 Message-ID: <1431053231-3390-1-git-send-email-wni@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from hqemgate16.nvidia.com ([216.228.121.65]:6594 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751381AbbEHCq5 (ORCPT ); Thu, 7 May 2015 22:46:57 -0400 Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: rui.zhang@intel.com, edubezval@gmail.com Cc: linux-pm@vger.kernel.org, Wei Ni The Linux thermal framework support to change thermal governor policy in userspace, but it can't show what available policies supported. This patch adds available_policies attribute to the thermal framework, it can list the thermal governors which can be used for a particular zone. This attribute is read only. Signed-off-by: Wei Ni --- v2: This change had been submitted and discussed in http://marc.info/?l=linux-tegra&m=138961183931457&w=2 https://www.marc.info/?l=linux-pm&m=138986468007449&w=1 cherry-picked it,and updated to this v2 version. Documentation/thermal/sysfs-api.txt | 6 ++++++ drivers/thermal/thermal_core.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+) diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt index 7d44d7f1a71b..e7d03cfafc63 100644 --- a/Documentation/thermal/sysfs-api.txt +++ b/Documentation/thermal/sysfs-api.txt @@ -180,6 +180,7 @@ Thermal zone device sys I/F, created once it's registered: |---temp: Current temperature |---mode: Working mode of the thermal zone |---policy: Thermal governor used for this zone + |---available_policies: Available thermal governors for this zone |---trip_point_[0-*]_temp: Trip point temperature |---trip_point_[0-*]_type: Trip point type |---trip_point_[0-*]_hyst: Hysteresis value for this trip point @@ -254,6 +255,10 @@ policy One of the various thermal governors used for a particular zone. RW, Required +available_policies + Available thermal governors which can be used for a particular zone. + RO, Required + trip_point_[0-*]_temp The temperature above which trip point will be fired. Unit: millidegree Celsius @@ -401,6 +406,7 @@ method, the sys I/F structure will be built like this: |---temp: 37000 |---mode: enabled |---policy: step_wise + |---available_policies: step_wise fair_share |---trip_point_0_temp: 100000 |---trip_point_0_type: critical |---trip_point_1_temp: 80000 diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 962de1847cc0..68a603a3d4ed 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -847,6 +847,27 @@ policy_show(struct device *dev, struct device_attribute *devattr, char *buf) return sprintf(buf, "%s\n", tz->governor->name); } +static ssize_t +available_policies_show(struct device *dev, struct device_attribute *devattr, + char *buf) +{ + struct thermal_governor *pos; + ssize_t count = 0; + ssize_t size; + + mutex_lock(&thermal_governor_lock); + + list_for_each_entry(pos, &thermal_governor_list, governor_list) { + size = PAGE_SIZE - count; + count += scnprintf(buf + count, size, "%s ", pos->name); + } + count += scnprintf(buf + count, size, "\n"); + + mutex_unlock(&thermal_governor_lock); + + return count; +} + #ifdef CONFIG_THERMAL_EMULATION static ssize_t emul_temp_store(struct device *dev, struct device_attribute *attr, @@ -1028,6 +1049,7 @@ static DEVICE_ATTR(temp, 0444, temp_show, NULL); static DEVICE_ATTR(mode, 0644, mode_show, mode_store); static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store); static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store); +static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL); /* sys I/F for cooling device */ #define to_cooling_device(_dev) \ @@ -1813,6 +1835,11 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type, if (result) goto unregister; + /* Create available_policies attribute */ + result = device_create_file(&tz->device, &dev_attr_available_policies); + if (result) + goto unregister; + /* Update 'this' zone's governor information */ mutex_lock(&thermal_governor_lock); @@ -1913,6 +1940,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz) if (tz->ops->get_mode) device_remove_file(&tz->device, &dev_attr_mode); device_remove_file(&tz->device, &dev_attr_policy); + device_remove_file(&tz->device, &dev_attr_available_policies); remove_trip_attrs(tz); thermal_set_governor(tz, NULL); -- 1.9.1