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![Thara Gopinath](/assets/img/avatar_default.png)
Sysfs interface to update cooling device cur_state does not currently holding cooling device lock sometimes leading to stale values in cur_state if getting updated simultanelously from user space and thermal framework. Adding the proper locking code fixes this issue. Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
1004 lines
24 KiB
C
1004 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* thermal.c - sysfs interface of thermal devices
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*
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* Copyright (C) 2016 Eduardo Valentin <edubezval@gmail.com>
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*
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* Highly based on original thermal_core.c
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* Copyright (C) 2008 Intel Corp
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* Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
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* Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/sysfs.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/jiffies.h>
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#include "thermal_core.h"
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/* sys I/F for thermal zone */
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static ssize_t
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type_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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return sprintf(buf, "%s\n", tz->type);
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}
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static ssize_t
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temp_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int temperature, ret;
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ret = thermal_zone_get_temp(tz, &temperature);
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if (ret)
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return ret;
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return sprintf(buf, "%d\n", temperature);
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}
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static ssize_t
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mode_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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enum thermal_device_mode mode;
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int result;
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if (!tz->ops->get_mode)
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return -EPERM;
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result = tz->ops->get_mode(tz, &mode);
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if (result)
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return result;
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return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
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: "disabled");
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}
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static ssize_t
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mode_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int result;
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if (!tz->ops->set_mode)
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return -EPERM;
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if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
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result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
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else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
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result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
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else
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result = -EINVAL;
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if (result)
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return result;
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return count;
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}
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static ssize_t
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trip_point_type_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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enum thermal_trip_type type;
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int trip, result;
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if (!tz->ops->get_trip_type)
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return -EPERM;
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if (sscanf(attr->attr.name, "trip_point_%d_type", &trip) != 1)
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return -EINVAL;
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result = tz->ops->get_trip_type(tz, trip, &type);
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if (result)
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return result;
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switch (type) {
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case THERMAL_TRIP_CRITICAL:
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return sprintf(buf, "critical\n");
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case THERMAL_TRIP_HOT:
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return sprintf(buf, "hot\n");
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case THERMAL_TRIP_PASSIVE:
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return sprintf(buf, "passive\n");
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case THERMAL_TRIP_ACTIVE:
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return sprintf(buf, "active\n");
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default:
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return sprintf(buf, "unknown\n");
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}
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}
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static ssize_t
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trip_point_temp_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int trip, ret;
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int temperature;
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if (!tz->ops->set_trip_temp)
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return -EPERM;
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if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
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return -EINVAL;
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if (kstrtoint(buf, 10, &temperature))
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return -EINVAL;
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ret = tz->ops->set_trip_temp(tz, trip, temperature);
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if (ret)
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return ret;
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thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
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return count;
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}
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static ssize_t
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trip_point_temp_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int trip, ret;
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int temperature;
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if (!tz->ops->get_trip_temp)
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return -EPERM;
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if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
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return -EINVAL;
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ret = tz->ops->get_trip_temp(tz, trip, &temperature);
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if (ret)
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return ret;
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return sprintf(buf, "%d\n", temperature);
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}
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static ssize_t
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trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int trip, ret;
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int temperature;
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if (!tz->ops->set_trip_hyst)
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return -EPERM;
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if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
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return -EINVAL;
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if (kstrtoint(buf, 10, &temperature))
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return -EINVAL;
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/*
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* We are not doing any check on the 'temperature' value
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* here. The driver implementing 'set_trip_hyst' has to
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* take care of this.
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*/
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ret = tz->ops->set_trip_hyst(tz, trip, temperature);
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if (!ret)
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thermal_zone_set_trips(tz);
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return ret ? ret : count;
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}
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static ssize_t
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trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int trip, ret;
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int temperature;
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if (!tz->ops->get_trip_hyst)
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return -EPERM;
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if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
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return -EINVAL;
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ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
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return ret ? ret : sprintf(buf, "%d\n", temperature);
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}
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static ssize_t
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passive_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int state;
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if (sscanf(buf, "%d\n", &state) != 1)
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return -EINVAL;
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/* sanity check: values below 1000 millicelcius don't make sense
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* and can cause the system to go into a thermal heart attack
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*/
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if (state && state < 1000)
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return -EINVAL;
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if (state && !tz->forced_passive) {
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if (!tz->passive_delay)
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tz->passive_delay = 1000;
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thermal_zone_device_rebind_exception(tz, "Processor",
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sizeof("Processor"));
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} else if (!state && tz->forced_passive) {
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tz->passive_delay = 0;
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thermal_zone_device_unbind_exception(tz, "Processor",
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sizeof("Processor"));
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}
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tz->forced_passive = state;
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thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
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return count;
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}
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static ssize_t
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passive_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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return sprintf(buf, "%d\n", tz->forced_passive);
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}
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static ssize_t
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policy_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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char name[THERMAL_NAME_LENGTH];
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int ret;
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snprintf(name, sizeof(name), "%s", buf);
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ret = thermal_zone_device_set_policy(tz, name);
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if (!ret)
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ret = count;
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return ret;
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}
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static ssize_t
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policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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return sprintf(buf, "%s\n", tz->governor->name);
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}
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static ssize_t
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available_policies_show(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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return thermal_build_list_of_policies(buf);
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}
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#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
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static ssize_t
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emul_temp_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int ret = 0;
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int temperature;
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if (kstrtoint(buf, 10, &temperature))
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return -EINVAL;
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if (!tz->ops->set_emul_temp) {
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mutex_lock(&tz->lock);
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tz->emul_temperature = temperature;
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mutex_unlock(&tz->lock);
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} else {
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ret = tz->ops->set_emul_temp(tz, temperature);
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}
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if (!ret)
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thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
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return ret ? ret : count;
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}
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static DEVICE_ATTR_WO(emul_temp);
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#endif
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static ssize_t
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sustainable_power_show(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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if (tz->tzp)
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return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
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else
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return -EIO;
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}
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static ssize_t
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sustainable_power_store(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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u32 sustainable_power;
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if (!tz->tzp)
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return -EIO;
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if (kstrtou32(buf, 10, &sustainable_power))
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return -EINVAL;
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tz->tzp->sustainable_power = sustainable_power;
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return count;
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}
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#define create_s32_tzp_attr(name) \
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static ssize_t \
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name##_show(struct device *dev, struct device_attribute *devattr, \
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char *buf) \
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{ \
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struct thermal_zone_device *tz = to_thermal_zone(dev); \
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\
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if (tz->tzp) \
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return sprintf(buf, "%d\n", tz->tzp->name); \
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else \
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return -EIO; \
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} \
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\
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static ssize_t \
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name##_store(struct device *dev, struct device_attribute *devattr, \
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const char *buf, size_t count) \
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{ \
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struct thermal_zone_device *tz = to_thermal_zone(dev); \
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s32 value; \
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\
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if (!tz->tzp) \
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return -EIO; \
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\
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if (kstrtos32(buf, 10, &value)) \
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return -EINVAL; \
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\
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tz->tzp->name = value; \
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\
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return count; \
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} \
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static DEVICE_ATTR_RW(name)
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create_s32_tzp_attr(k_po);
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create_s32_tzp_attr(k_pu);
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create_s32_tzp_attr(k_i);
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create_s32_tzp_attr(k_d);
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create_s32_tzp_attr(integral_cutoff);
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create_s32_tzp_attr(slope);
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create_s32_tzp_attr(offset);
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#undef create_s32_tzp_attr
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/*
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* These are thermal zone device attributes that will always be present.
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* All the attributes created for tzp (create_s32_tzp_attr) also are always
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* present on the sysfs interface.
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*/
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static DEVICE_ATTR_RO(type);
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static DEVICE_ATTR_RO(temp);
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static DEVICE_ATTR_RW(policy);
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static DEVICE_ATTR_RO(available_policies);
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static DEVICE_ATTR_RW(sustainable_power);
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/* These thermal zone device attributes are created based on conditions */
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static DEVICE_ATTR_RW(mode);
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static DEVICE_ATTR_RW(passive);
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/* These attributes are unconditionally added to a thermal zone */
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static struct attribute *thermal_zone_dev_attrs[] = {
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&dev_attr_type.attr,
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&dev_attr_temp.attr,
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#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
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&dev_attr_emul_temp.attr,
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#endif
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&dev_attr_policy.attr,
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&dev_attr_available_policies.attr,
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&dev_attr_sustainable_power.attr,
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&dev_attr_k_po.attr,
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&dev_attr_k_pu.attr,
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&dev_attr_k_i.attr,
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&dev_attr_k_d.attr,
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&dev_attr_integral_cutoff.attr,
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&dev_attr_slope.attr,
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&dev_attr_offset.attr,
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NULL,
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};
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static struct attribute_group thermal_zone_attribute_group = {
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.attrs = thermal_zone_dev_attrs,
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};
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/* We expose mode only if .get_mode is present */
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static struct attribute *thermal_zone_mode_attrs[] = {
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&dev_attr_mode.attr,
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NULL,
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};
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static umode_t thermal_zone_mode_is_visible(struct kobject *kobj,
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struct attribute *attr,
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int attrno)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct thermal_zone_device *tz;
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tz = container_of(dev, struct thermal_zone_device, device);
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if (tz->ops->get_mode)
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return attr->mode;
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return 0;
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}
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static struct attribute_group thermal_zone_mode_attribute_group = {
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.attrs = thermal_zone_mode_attrs,
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.is_visible = thermal_zone_mode_is_visible,
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};
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/* We expose passive only if passive trips are present */
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static struct attribute *thermal_zone_passive_attrs[] = {
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&dev_attr_passive.attr,
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NULL,
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};
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static umode_t thermal_zone_passive_is_visible(struct kobject *kobj,
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struct attribute *attr,
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int attrno)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct thermal_zone_device *tz;
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enum thermal_trip_type trip_type;
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int count, passive = 0;
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tz = container_of(dev, struct thermal_zone_device, device);
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for (count = 0; count < tz->trips && !passive; count++) {
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tz->ops->get_trip_type(tz, count, &trip_type);
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if (trip_type == THERMAL_TRIP_PASSIVE)
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passive = 1;
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}
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if (!passive)
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return attr->mode;
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return 0;
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}
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static struct attribute_group thermal_zone_passive_attribute_group = {
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.attrs = thermal_zone_passive_attrs,
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.is_visible = thermal_zone_passive_is_visible,
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};
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static const struct attribute_group *thermal_zone_attribute_groups[] = {
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&thermal_zone_attribute_group,
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&thermal_zone_mode_attribute_group,
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&thermal_zone_passive_attribute_group,
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/* This is not NULL terminated as we create the group dynamically */
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};
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/**
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* create_trip_attrs() - create attributes for trip points
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* @tz: the thermal zone device
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* @mask: Writeable trip point bitmap.
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*
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* helper function to instantiate sysfs entries for every trip
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* point and its properties of a struct thermal_zone_device.
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*
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* Return: 0 on success, the proper error value otherwise.
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*/
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static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
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{
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struct attribute **attrs;
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int indx;
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/* This function works only for zones with at least one trip */
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if (tz->trips <= 0)
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return -EINVAL;
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tz->trip_type_attrs = kcalloc(tz->trips, sizeof(*tz->trip_type_attrs),
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GFP_KERNEL);
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if (!tz->trip_type_attrs)
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return -ENOMEM;
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tz->trip_temp_attrs = kcalloc(tz->trips, sizeof(*tz->trip_temp_attrs),
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GFP_KERNEL);
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if (!tz->trip_temp_attrs) {
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kfree(tz->trip_type_attrs);
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return -ENOMEM;
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}
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if (tz->ops->get_trip_hyst) {
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tz->trip_hyst_attrs = kcalloc(tz->trips,
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|
sizeof(*tz->trip_hyst_attrs),
|
|
GFP_KERNEL);
|
|
if (!tz->trip_hyst_attrs) {
|
|
kfree(tz->trip_type_attrs);
|
|
kfree(tz->trip_temp_attrs);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
attrs = kcalloc(tz->trips * 3 + 1, sizeof(*attrs), GFP_KERNEL);
|
|
if (!attrs) {
|
|
kfree(tz->trip_type_attrs);
|
|
kfree(tz->trip_temp_attrs);
|
|
if (tz->ops->get_trip_hyst)
|
|
kfree(tz->trip_hyst_attrs);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (indx = 0; indx < tz->trips; indx++) {
|
|
/* create trip type attribute */
|
|
snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
|
|
"trip_point_%d_type", indx);
|
|
|
|
sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
|
|
tz->trip_type_attrs[indx].attr.attr.name =
|
|
tz->trip_type_attrs[indx].name;
|
|
tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
|
|
tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
|
|
attrs[indx] = &tz->trip_type_attrs[indx].attr.attr;
|
|
|
|
/* create trip temp attribute */
|
|
snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
|
|
"trip_point_%d_temp", indx);
|
|
|
|
sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
|
|
tz->trip_temp_attrs[indx].attr.attr.name =
|
|
tz->trip_temp_attrs[indx].name;
|
|
tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
|
|
tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
|
|
if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
|
|
mask & (1 << indx)) {
|
|
tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
|
|
tz->trip_temp_attrs[indx].attr.store =
|
|
trip_point_temp_store;
|
|
}
|
|
attrs[indx + tz->trips] = &tz->trip_temp_attrs[indx].attr.attr;
|
|
|
|
/* create Optional trip hyst attribute */
|
|
if (!tz->ops->get_trip_hyst)
|
|
continue;
|
|
snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
|
|
"trip_point_%d_hyst", indx);
|
|
|
|
sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
|
|
tz->trip_hyst_attrs[indx].attr.attr.name =
|
|
tz->trip_hyst_attrs[indx].name;
|
|
tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
|
|
tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
|
|
if (tz->ops->set_trip_hyst) {
|
|
tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
|
|
tz->trip_hyst_attrs[indx].attr.store =
|
|
trip_point_hyst_store;
|
|
}
|
|
attrs[indx + tz->trips * 2] =
|
|
&tz->trip_hyst_attrs[indx].attr.attr;
|
|
}
|
|
attrs[tz->trips * 3] = NULL;
|
|
|
|
tz->trips_attribute_group.attrs = attrs;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* destroy_trip_attrs() - destroy attributes for trip points
|
|
* @tz: the thermal zone device
|
|
*
|
|
* helper function to free resources allocated by create_trip_attrs()
|
|
*/
|
|
static void destroy_trip_attrs(struct thermal_zone_device *tz)
|
|
{
|
|
if (!tz)
|
|
return;
|
|
|
|
kfree(tz->trip_type_attrs);
|
|
kfree(tz->trip_temp_attrs);
|
|
if (tz->ops->get_trip_hyst)
|
|
kfree(tz->trip_hyst_attrs);
|
|
kfree(tz->trips_attribute_group.attrs);
|
|
}
|
|
|
|
int thermal_zone_create_device_groups(struct thermal_zone_device *tz,
|
|
int mask)
|
|
{
|
|
const struct attribute_group **groups;
|
|
int i, size, result;
|
|
|
|
/* we need one extra for trips and the NULL to terminate the array */
|
|
size = ARRAY_SIZE(thermal_zone_attribute_groups) + 2;
|
|
/* This also takes care of API requirement to be NULL terminated */
|
|
groups = kcalloc(size, sizeof(*groups), GFP_KERNEL);
|
|
if (!groups)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < size - 2; i++)
|
|
groups[i] = thermal_zone_attribute_groups[i];
|
|
|
|
if (tz->trips) {
|
|
result = create_trip_attrs(tz, mask);
|
|
if (result) {
|
|
kfree(groups);
|
|
|
|
return result;
|
|
}
|
|
|
|
groups[size - 2] = &tz->trips_attribute_group;
|
|
}
|
|
|
|
tz->device.groups = groups;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void thermal_zone_destroy_device_groups(struct thermal_zone_device *tz)
|
|
{
|
|
if (!tz)
|
|
return;
|
|
|
|
if (tz->trips)
|
|
destroy_trip_attrs(tz);
|
|
|
|
kfree(tz->device.groups);
|
|
}
|
|
|
|
/* sys I/F for cooling device */
|
|
static ssize_t
|
|
cdev_type_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
|
|
|
return sprintf(buf, "%s\n", cdev->type);
|
|
}
|
|
|
|
static ssize_t max_state_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
|
unsigned long state;
|
|
int ret;
|
|
|
|
ret = cdev->ops->get_max_state(cdev, &state);
|
|
if (ret)
|
|
return ret;
|
|
return sprintf(buf, "%ld\n", state);
|
|
}
|
|
|
|
static ssize_t cur_state_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
|
unsigned long state;
|
|
int ret;
|
|
|
|
ret = cdev->ops->get_cur_state(cdev, &state);
|
|
if (ret)
|
|
return ret;
|
|
return sprintf(buf, "%ld\n", state);
|
|
}
|
|
|
|
static ssize_t
|
|
cur_state_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
|
unsigned long state;
|
|
int result;
|
|
|
|
if (sscanf(buf, "%ld\n", &state) != 1)
|
|
return -EINVAL;
|
|
|
|
if ((long)state < 0)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&cdev->lock);
|
|
|
|
result = cdev->ops->set_cur_state(cdev, state);
|
|
if (!result)
|
|
thermal_cooling_device_stats_update(cdev, state);
|
|
|
|
mutex_unlock(&cdev->lock);
|
|
return result ? result : count;
|
|
}
|
|
|
|
static struct device_attribute
|
|
dev_attr_cdev_type = __ATTR(type, 0444, cdev_type_show, NULL);
|
|
static DEVICE_ATTR_RO(max_state);
|
|
static DEVICE_ATTR_RW(cur_state);
|
|
|
|
static struct attribute *cooling_device_attrs[] = {
|
|
&dev_attr_cdev_type.attr,
|
|
&dev_attr_max_state.attr,
|
|
&dev_attr_cur_state.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group cooling_device_attr_group = {
|
|
.attrs = cooling_device_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *cooling_device_attr_groups[] = {
|
|
&cooling_device_attr_group,
|
|
NULL, /* Space allocated for cooling_device_stats_attr_group */
|
|
NULL,
|
|
};
|
|
|
|
#ifdef CONFIG_THERMAL_STATISTICS
|
|
struct cooling_dev_stats {
|
|
spinlock_t lock;
|
|
unsigned int total_trans;
|
|
unsigned long state;
|
|
unsigned long max_states;
|
|
ktime_t last_time;
|
|
ktime_t *time_in_state;
|
|
unsigned int *trans_table;
|
|
};
|
|
|
|
static void update_time_in_state(struct cooling_dev_stats *stats)
|
|
{
|
|
ktime_t now = ktime_get(), delta;
|
|
|
|
delta = ktime_sub(now, stats->last_time);
|
|
stats->time_in_state[stats->state] =
|
|
ktime_add(stats->time_in_state[stats->state], delta);
|
|
stats->last_time = now;
|
|
}
|
|
|
|
void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
|
|
unsigned long new_state)
|
|
{
|
|
struct cooling_dev_stats *stats = cdev->stats;
|
|
|
|
spin_lock(&stats->lock);
|
|
|
|
if (stats->state == new_state)
|
|
goto unlock;
|
|
|
|
update_time_in_state(stats);
|
|
stats->trans_table[stats->state * stats->max_states + new_state]++;
|
|
stats->state = new_state;
|
|
stats->total_trans++;
|
|
|
|
unlock:
|
|
spin_unlock(&stats->lock);
|
|
}
|
|
|
|
static ssize_t total_trans_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
|
struct cooling_dev_stats *stats = cdev->stats;
|
|
int ret;
|
|
|
|
spin_lock(&stats->lock);
|
|
ret = sprintf(buf, "%u\n", stats->total_trans);
|
|
spin_unlock(&stats->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t
|
|
time_in_state_ms_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
|
struct cooling_dev_stats *stats = cdev->stats;
|
|
ssize_t len = 0;
|
|
int i;
|
|
|
|
spin_lock(&stats->lock);
|
|
update_time_in_state(stats);
|
|
|
|
for (i = 0; i < stats->max_states; i++) {
|
|
len += sprintf(buf + len, "state%u\t%llu\n", i,
|
|
ktime_to_ms(stats->time_in_state[i]));
|
|
}
|
|
spin_unlock(&stats->lock);
|
|
|
|
return len;
|
|
}
|
|
|
|
static ssize_t
|
|
reset_store(struct device *dev, struct device_attribute *attr, const char *buf,
|
|
size_t count)
|
|
{
|
|
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
|
struct cooling_dev_stats *stats = cdev->stats;
|
|
int i, states = stats->max_states;
|
|
|
|
spin_lock(&stats->lock);
|
|
|
|
stats->total_trans = 0;
|
|
stats->last_time = ktime_get();
|
|
memset(stats->trans_table, 0,
|
|
states * states * sizeof(*stats->trans_table));
|
|
|
|
for (i = 0; i < stats->max_states; i++)
|
|
stats->time_in_state[i] = ktime_set(0, 0);
|
|
|
|
spin_unlock(&stats->lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t trans_table_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
|
struct cooling_dev_stats *stats = cdev->stats;
|
|
ssize_t len = 0;
|
|
int i, j;
|
|
|
|
len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n");
|
|
len += snprintf(buf + len, PAGE_SIZE - len, " : ");
|
|
for (i = 0; i < stats->max_states; i++) {
|
|
if (len >= PAGE_SIZE)
|
|
break;
|
|
len += snprintf(buf + len, PAGE_SIZE - len, "state%2u ", i);
|
|
}
|
|
if (len >= PAGE_SIZE)
|
|
return PAGE_SIZE;
|
|
|
|
len += snprintf(buf + len, PAGE_SIZE - len, "\n");
|
|
|
|
for (i = 0; i < stats->max_states; i++) {
|
|
if (len >= PAGE_SIZE)
|
|
break;
|
|
|
|
len += snprintf(buf + len, PAGE_SIZE - len, "state%2u:", i);
|
|
|
|
for (j = 0; j < stats->max_states; j++) {
|
|
if (len >= PAGE_SIZE)
|
|
break;
|
|
len += snprintf(buf + len, PAGE_SIZE - len, "%8u ",
|
|
stats->trans_table[i * stats->max_states + j]);
|
|
}
|
|
if (len >= PAGE_SIZE)
|
|
break;
|
|
len += snprintf(buf + len, PAGE_SIZE - len, "\n");
|
|
}
|
|
|
|
if (len >= PAGE_SIZE) {
|
|
pr_warn_once("Thermal transition table exceeds PAGE_SIZE. Disabling\n");
|
|
return -EFBIG;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(total_trans);
|
|
static DEVICE_ATTR_RO(time_in_state_ms);
|
|
static DEVICE_ATTR_WO(reset);
|
|
static DEVICE_ATTR_RO(trans_table);
|
|
|
|
static struct attribute *cooling_device_stats_attrs[] = {
|
|
&dev_attr_total_trans.attr,
|
|
&dev_attr_time_in_state_ms.attr,
|
|
&dev_attr_reset.attr,
|
|
&dev_attr_trans_table.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group cooling_device_stats_attr_group = {
|
|
.attrs = cooling_device_stats_attrs,
|
|
.name = "stats"
|
|
};
|
|
|
|
static void cooling_device_stats_setup(struct thermal_cooling_device *cdev)
|
|
{
|
|
struct cooling_dev_stats *stats;
|
|
unsigned long states;
|
|
int var;
|
|
|
|
if (cdev->ops->get_max_state(cdev, &states))
|
|
return;
|
|
|
|
states++; /* Total number of states is highest state + 1 */
|
|
|
|
var = sizeof(*stats);
|
|
var += sizeof(*stats->time_in_state) * states;
|
|
var += sizeof(*stats->trans_table) * states * states;
|
|
|
|
stats = kzalloc(var, GFP_KERNEL);
|
|
if (!stats)
|
|
return;
|
|
|
|
stats->time_in_state = (ktime_t *)(stats + 1);
|
|
stats->trans_table = (unsigned int *)(stats->time_in_state + states);
|
|
cdev->stats = stats;
|
|
stats->last_time = ktime_get();
|
|
stats->max_states = states;
|
|
|
|
spin_lock_init(&stats->lock);
|
|
|
|
/* Fill the empty slot left in cooling_device_attr_groups */
|
|
var = ARRAY_SIZE(cooling_device_attr_groups) - 2;
|
|
cooling_device_attr_groups[var] = &cooling_device_stats_attr_group;
|
|
}
|
|
|
|
static void cooling_device_stats_destroy(struct thermal_cooling_device *cdev)
|
|
{
|
|
kfree(cdev->stats);
|
|
cdev->stats = NULL;
|
|
}
|
|
|
|
#else
|
|
|
|
static inline void
|
|
cooling_device_stats_setup(struct thermal_cooling_device *cdev) {}
|
|
static inline void
|
|
cooling_device_stats_destroy(struct thermal_cooling_device *cdev) {}
|
|
|
|
#endif /* CONFIG_THERMAL_STATISTICS */
|
|
|
|
void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *cdev)
|
|
{
|
|
cooling_device_stats_setup(cdev);
|
|
cdev->device.groups = cooling_device_attr_groups;
|
|
}
|
|
|
|
void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev)
|
|
{
|
|
cooling_device_stats_destroy(cdev);
|
|
}
|
|
|
|
/* these helper will be used only at the time of bindig */
|
|
ssize_t
|
|
trip_point_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct thermal_instance *instance;
|
|
|
|
instance =
|
|
container_of(attr, struct thermal_instance, attr);
|
|
|
|
if (instance->trip == THERMAL_TRIPS_NONE)
|
|
return sprintf(buf, "-1\n");
|
|
else
|
|
return sprintf(buf, "%d\n", instance->trip);
|
|
}
|
|
|
|
ssize_t
|
|
weight_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct thermal_instance *instance;
|
|
|
|
instance = container_of(attr, struct thermal_instance, weight_attr);
|
|
|
|
return sprintf(buf, "%d\n", instance->weight);
|
|
}
|
|
|
|
ssize_t weight_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct thermal_instance *instance;
|
|
int ret, weight;
|
|
|
|
ret = kstrtoint(buf, 0, &weight);
|
|
if (ret)
|
|
return ret;
|
|
|
|
instance = container_of(attr, struct thermal_instance, weight_attr);
|
|
instance->weight = weight;
|
|
|
|
return count;
|
|
}
|