From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933649AbbA1UiK (ORCPT ); Wed, 28 Jan 2015 15:38:10 -0500 Received: from foss-mx-na.foss.arm.com ([217.140.108.86]:45515 "EHLO foss-mx-na.foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933576AbbA1UiH (ORCPT ); Wed, 28 Jan 2015 15:38:07 -0500 From: Javi Merino To: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: punit.agrawal@arm.com, broonie@kernel.org, Javi Merino , Zhang Rui , Eduardo Valentin Subject: [PATCH v1 7/7] thermal: export thermal_zone_parameters to sysfs Date: Wed, 28 Jan 2015 17:00:38 +0000 Message-Id: <1422464438-16761-8-git-send-email-javi.merino@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1422464438-16761-1-git-send-email-javi.merino@arm.com> References: <1422464438-16761-1-git-send-email-javi.merino@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org It's useful for tuning to be able to edit thermal_zone_parameters from userspace. Export them to the thermal_zone sysfs so that they can be easily changed. Cc: Zhang Rui Cc: Eduardo Valentin Signed-off-by: Javi Merino --- Documentation/thermal/sysfs-api.txt | 52 +++++++++++++++++ drivers/thermal/thermal_core.c | 110 ++++++++++++++++++++++++++++++++++++ 2 files changed, 162 insertions(+) diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt index 87519cb379ee..a95aabfad014 100644 --- a/Documentation/thermal/sysfs-api.txt +++ b/Documentation/thermal/sysfs-api.txt @@ -176,6 +176,12 @@ Thermal zone device sys I/F, created once it's registered: |---trip_point_[0-*]_type: Trip point type |---trip_point_[0-*]_hyst: Hysteresis value for this trip point |---emul_temp: Emulated temperature set node + |---sustainable_power: Sustainable dissipatable power + |---k_po: Proportional term during temperature overshoot + |---k_pu: Proportional term during temperature undershoot + |---k_i: PID's integral term in the power allocator gov + |---k_d: PID's derivative term in the power allocator + |---integral_cutoff: Offset above which errors are accumulated Thermal cooling device sys I/F, created once it's registered: /sys/class/thermal/cooling_device[0-*]: @@ -289,6 +295,52 @@ emul_temp because userland can easily disable the thermal policy by simply flooding this sysfs node with low temperature values. +sustainable_power + An estimate of the sustained power that can be dissipated by + the thermal zone. Used by the power allocator governor. For + more information see Documentation/thermal/power_allocator.txt + Unit: milliwatts + RW, Optional + +k_po + The proportional term of the power allocator governor's PID + controller during temperature overshoot. Temperature overshoot + is when the current temperature is above the "desired + temperature" trip point. For more information see + Documentation/thermal/power_allocator.txt + RW, Optional + +k_pu + The proportional term of the power allocator governor's PID + controller during temperature undershoot. Temperature undershoot + is when the current temperature is below the "desired + temperature" trip point. For more information see + Documentation/thermal/power_allocator.txt + RW, Optional + +k_i + The integral term of the power allocator governor's PID + controller. This term allows the PID controller to compensate + for long term drift. For more information see + Documentation/thermal/power_allocator.txt + RW, Optional + +k_d + The derivative term of the power allocator governor's PID + controller. For more information see + Documentation/thermal/power_allocator.txt + RW, Optional + +integral_cutoff + Temperature offset from the desired temperature trip point + above which the integral term of the power allocator + governor's PID controller starts accumulating errors. For + example, if integral_cutoff is 0, then the integral term only + accumulates error when temperature is above the desired + temperature trip point. For more information see + Documentation/thermal/power_allocator.txt + RW, Optional + ***************************** * Cooling device attributes * ***************************** diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index b77b5416929c..bde5e0442321 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -868,6 +868,111 @@ emul_temp_store(struct device *dev, struct device_attribute *attr, static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store); #endif/*CONFIG_THERMAL_EMULATION*/ +#ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR + +static ssize_t +sustainable_power_show(struct device *dev, struct device_attribute *devattr, + char *buf) +{ + struct thermal_zone_device *tz = to_thermal_zone(dev); + + if (tz->tzp) + return sprintf(buf, "%u\n", tz->tzp->sustainable_power); + else + return -EIO; +} + +static ssize_t +sustainable_power_store(struct device *dev, struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct thermal_zone_device *tz = to_thermal_zone(dev); + u32 sustainable_power; + + if (!tz->tzp) + return -EIO; + + if (kstrtou32(buf, 10, &sustainable_power)) + return -EINVAL; + + tz->tzp->sustainable_power = sustainable_power; + + return count; +} +static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show, + sustainable_power_store); + +#define create_s32_tzp_attr(name) \ + static ssize_t \ + name##_show(struct device *dev, struct device_attribute *devattr, \ + char *buf) \ + { \ + struct thermal_zone_device *tz = to_thermal_zone(dev); \ + \ + if (tz->tzp) \ + return sprintf(buf, "%u\n", tz->tzp->name); \ + else \ + return -EIO; \ + } \ + \ + static ssize_t \ + name##_store(struct device *dev, struct device_attribute *devattr, \ + const char *buf, size_t count) \ + { \ + struct thermal_zone_device *tz = to_thermal_zone(dev); \ + s32 value; \ + \ + if (!tz->tzp) \ + return -EIO; \ + \ + if (kstrtos32(buf, 10, &value)) \ + return -EINVAL; \ + \ + tz->tzp->name = value; \ + \ + return count; \ + } \ + static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store) + +create_s32_tzp_attr(k_po); +create_s32_tzp_attr(k_pu); +create_s32_tzp_attr(k_i); +create_s32_tzp_attr(k_d); +create_s32_tzp_attr(integral_cutoff); +#undef create_s32_tzp_attr + +static struct device_attribute *dev_tzp_attrs[] = { + &dev_attr_sustainable_power, + &dev_attr_k_po, + &dev_attr_k_pu, + &dev_attr_k_i, + &dev_attr_k_d, + &dev_attr_integral_cutoff, +}; + +static int create_power_allocator_tzp_attrs(struct device *dev) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) { + int ret; + struct device_attribute *dev_attr = dev_tzp_attrs[i]; + + ret = device_create_file(dev, dev_attr); + if (ret) + return ret; + } + + return 0; +} + +#else /* !CONFIG_THERMAL_GOV_POWER_ALLOCATOR */ +static int create_power_allocator_tzp_attrs(struct device *dev) +{ + return 0; +} +#endif + /** * power_actor_get_max_power() - get the maximum power that a cdev can consume * @cdev: pointer to &thermal_cooling_device @@ -1662,6 +1767,11 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type, if (result) goto unregister; + /* Add power_allocator specific thermal zone params */ + result = create_power_allocator_tzp_attrs(&tz->device); + if (result) + goto unregister; + /* Update 'this' zone's governor information */ mutex_lock(&thermal_governor_lock); -- 1.9.1