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![Daniel Lezcano](/assets/img/avatar_default.png)
The cooling devices have their cooling device set_cur_state read-writable all the time in the sysfs directory, thus allowing the userspace to act on it. The thermal framework is wrongly used by userspace as a power capping framework by acting on the cooling device opaque state. This one then competes with the in-kernel governor decision. We have seen in out-of-tree kernels, a big number of devices which are abusely declaring themselves as cooling device just to act on their power. The role of the thermal framework is to protect the junction temperature of the silicon. Letting the userspace to play with a cooling device is invalid and potentially dangerous. The powercap framework is the right framework to do power capping and moreover it deals with the aggregation via the dev pm qos. As the userspace governor is marked deprecated and about to be removed, there is no point to keep this file writable also in the future. Emit a warning and deprecate the interface. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Lukasz Luba <lukasz.luba@arm.com> Link: https://lore.kernel.org/r/20211019163506.2831454-2-daniel.lezcano@linaro.org
911 lines
22 KiB
C
911 lines
22 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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int enabled = thermal_zone_device_is_enabled(tz);
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return sprintf(buf, "%s\n", enabled ? "enabled" : "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 (!strncmp(buf, "enabled", sizeof("enabled") - 1))
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result = thermal_zone_device_enable(tz);
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else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
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result = thermal_zone_device_disable(tz);
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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, hyst = 0;
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enum thermal_trip_type type;
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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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if (tz->ops->get_trip_hyst) {
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ret = tz->ops->get_trip_hyst(tz, trip, &hyst);
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if (ret)
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return ret;
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}
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ret = tz->ops->get_trip_type(tz, trip, &type);
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if (ret)
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return ret;
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thermal_notify_tz_trip_change(tz->id, trip, type, temperature, hyst);
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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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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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/* 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 const struct attribute_group thermal_zone_attribute_group = {
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.attrs = thermal_zone_dev_attrs,
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};
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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 const struct attribute_group thermal_zone_mode_attribute_group = {
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.attrs = thermal_zone_mode_attrs,
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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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/* 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),
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GFP_KERNEL);
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if (!tz->trip_hyst_attrs) {
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kfree(tz->trip_type_attrs);
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kfree(tz->trip_temp_attrs);
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return -ENOMEM;
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}
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}
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attrs = kcalloc(tz->trips * 3 + 1, sizeof(*attrs), GFP_KERNEL);
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if (!attrs) {
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kfree(tz->trip_type_attrs);
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kfree(tz->trip_temp_attrs);
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if (tz->ops->get_trip_hyst)
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kfree(tz->trip_hyst_attrs);
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return -ENOMEM;
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}
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for (indx = 0; indx < tz->trips; indx++) {
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/* create trip type attribute */
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snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
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"trip_point_%d_type", indx);
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sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
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tz->trip_type_attrs[indx].attr.attr.name =
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tz->trip_type_attrs[indx].name;
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tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
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tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
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attrs[indx] = &tz->trip_type_attrs[indx].attr.attr;
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/* create trip temp attribute */
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snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
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"trip_point_%d_temp", indx);
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sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
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tz->trip_temp_attrs[indx].attr.attr.name =
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tz->trip_temp_attrs[indx].name;
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tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
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tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
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if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
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mask & (1 << indx)) {
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tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
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tz->trip_temp_attrs[indx].attr.store =
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trip_point_temp_store;
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}
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attrs[indx + tz->trips] = &tz->trip_temp_attrs[indx].attr.attr;
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/* create Optional trip hyst attribute */
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if (!tz->ops->get_trip_hyst)
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continue;
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snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
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"trip_point_%d_hyst", indx);
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sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
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tz->trip_hyst_attrs[indx].attr.attr.name =
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tz->trip_hyst_attrs[indx].name;
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tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
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tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
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if (tz->ops->set_trip_hyst) {
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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;
|
|
|
|
dev_warn_once(&cdev->device,
|
|
"Setting cooling device state is deprecated\n");
|
|
|
|
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;
|
|
|
|
if (!stats)
|
|
return;
|
|
|
|
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);
|
|
|
|
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;
|
|
}
|