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Message-ID: <1561472500.19713.2.camel@intel.com>
Date: Tue, 25 Jun 2019 22:21:40 +0800
From: Zhang Rui <rui.zhang@...el.com>
To: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Cc: Linux Doc Mailing List <linux-doc@...r.kernel.org>,
Mauro Carvalho Chehab <mchehab@...radead.org>,
linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>,
Amit Daniel Kachhap <amit.kachhap@...il.com>,
Viresh Kumar <viresh.kumar@...aro.org>,
Javi Merino <javi.merino@...nel.org>,
Kukjin Kim <kgene@...nel.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Eduardo Valentin <edubezval@...il.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org,
Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH v1 04/22] docs: thermal: convert to ReST
On 二, 2019-06-25 at 10:53 -0300, Mauro Carvalho Chehab wrote:
> Em Tue, 25 Jun 2019 21:40:11 +0800
> Zhang Rui <rui.zhang@...el.com> escreveu:
>
> >
> > On 二, 2019-06-18 at 18:05 -0300, Mauro Carvalho Chehab wrote:
> > >
> > > Rename the thermal documentation files to ReST, add an
> > > index for them and adjust in order to produce a nice html
> > > output via the Sphinx build system.
> > >
> > > At its new index.rst, let's add a :orphan: while this is not
> > > linked
> > > to
> > > the main index.rst file, in order to avoid build warnings.
> > >
> > > Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
> > >
> > Acked-by: Zhang Rui <rui.zhang@...el.com>
> >
> > should I apply this patch or you have a separate tree for all these
> > changes?
> Feel free to apply it directly to your tree. The patches on this
> series are pretty much independent.
>
okay, queued for 5.3-rc1.
thanks,
rui
> >
> >
> > thanks,
> > rui
> > >
> > > ---
> > > ...pu-cooling-api.txt => cpu-cooling-api.rst} | 39 +-
> > > .../{exynos_thermal => exynos_thermal.rst} | 47 +-
> > > ...emulation => exynos_thermal_emulation.rst} | 66 +--
> > > Documentation/thermal/index.rst | 18 +
> > > ...el_powerclamp.txt => intel_powerclamp.rst} | 177 +++----
> > > .../{nouveau_thermal => nouveau_thermal.rst} | 54 +-
> > > ...ower_allocator.txt => power_allocator.rst} | 140 ++---
> > > .../thermal/{sysfs-api.txt => sysfs-api.rst} | 490
> > > ++++++++++++--
> > > ----
> > > ...hermal => x86_pkg_temperature_thermal.rst} | 28 +-
> > > MAINTAINERS | 2 +-
> > > include/linux/thermal.h | 4 +-
> > > 11 files changed, 665 insertions(+), 400 deletions(-)
> > > rename Documentation/thermal/{cpu-cooling-api.txt => cpu-
> > > cooling-
> > > api.rst} (82%)
> > > rename Documentation/thermal/{exynos_thermal =>
> > > exynos_thermal.rst}
> > > (67%)
> > > rename Documentation/thermal/{exynos_thermal_emulation =>
> > > exynos_thermal_emulation.rst} (36%)
> > > create mode 100644 Documentation/thermal/index.rst
> > > rename Documentation/thermal/{intel_powerclamp.txt =>
> > > intel_powerclamp.rst} (76%)
> > > rename Documentation/thermal/{nouveau_thermal =>
> > > nouveau_thermal.rst} (64%)
> > > rename Documentation/thermal/{power_allocator.txt =>
> > > power_allocator.rst} (74%)
> > > rename Documentation/thermal/{sysfs-api.txt => sysfs-api.rst}
> > > (66%)
> > > rename Documentation/thermal/{x86_pkg_temperature_thermal =>
> > > x86_pkg_temperature_thermal.rst} (80%)
> > >
> > > diff --git a/Documentation/thermal/cpu-cooling-api.txt
> > > b/Documentation/thermal/cpu-cooling-api.rst
> > > similarity index 82%
> > > rename from Documentation/thermal/cpu-cooling-api.txt
> > > rename to Documentation/thermal/cpu-cooling-api.rst
> > > index 7df567eaea1a..645d914c45a6 100644
> > > --- a/Documentation/thermal/cpu-cooling-api.txt
> > > +++ b/Documentation/thermal/cpu-cooling-api.rst
> > > @@ -1,5 +1,6 @@
> > > +=======================
> > > CPU cooling APIs How To
> > > -===================================
> > > +=======================
> > >
> > > Written by Amit Daniel Kachhap <amit.kachhap@...aro.org>
> > >
> > > @@ -8,40 +9,54 @@ Updated: 6 Jan 2015
> > > Copyright (c) 2012 Samsung Electronics Co., Ltd(http://www.sams
> > > ung.
> > > com)
> > >
> > > 0. Introduction
> > > +===============
> > >
> > > The generic cpu cooling(freq clipping) provides
> > > registration/unregistration APIs
> > > to the caller. The binding of the cooling devices to the trip
> > > point
> > > is left for
> > > the user. The registration APIs returns the cooling device
> > > pointer.
> > >
> > > 1. cpu cooling APIs
> > > +===================
> > >
> > > 1.1 cpufreq registration/unregistration APIs
> > > -1.1.1 struct thermal_cooling_device *cpufreq_cooling_register(
> > > - struct cpumask *clip_cpus)
> > > +--------------------------------------------
> > > +
> > > + ::
> > > +
> > > + struct thermal_cooling_device
> > > + *cpufreq_cooling_register(struct cpumask *clip_cpus)
> > >
> > > This interface function registers the cpufreq cooling device
> > > with the name
> > > "thermal-cpufreq-%x". This api can support multiple
> > > instances of
> > > cpufreq
> > > cooling devices.
> > >
> > > - clip_cpus: cpumask of cpus where the frequency constraints
> > > will
> > > happen.
> > > + clip_cpus:
> > > + cpumask of cpus where the frequency constraints will
> > > happen.
> > >
> > > -1.1.2 struct thermal_cooling_device
> > > *of_cpufreq_cooling_register(
> > > - struct cpufreq_policy
> > > *policy)
> > > + ::
> > > +
> > > + struct thermal_cooling_device
> > > + *of_cpufreq_cooling_register(struct cpufreq_policy
> > > *policy)
> > >
> > > This interface function registers the cpufreq cooling device
> > > with
> > > the name "thermal-cpufreq-%x" linking it with a device tree
> > > node, in
> > > order to bind it via the thermal DT code. This api can
> > > support
> > > multiple
> > > instances of cpufreq cooling devices.
> > >
> > > - policy: CPUFreq policy.
> > > + policy:
> > > + CPUFreq policy.
> > >
> > > -1.1.3 void cpufreq_cooling_unregister(struct
> > > thermal_cooling_device
> > > *cdev)
> > > +
> > > + ::
> > > +
> > > + void cpufreq_cooling_unregister(struct
> > > thermal_cooling_device *cdev)
> > >
> > > This interface function unregisters the "thermal-cpufreq-%x"
> > > cooling device.
> > >
> > > cdev: Cooling device pointer which has to be unregistered.
> > >
> > > 2. Power models
> > > +===============
> > >
> > > The power API registration functions provide a simple power
> > > model
> > > for
> > > CPUs. The current power is calculated as dynamic power (static
> > > power isn't
> > > @@ -65,9 +80,9 @@ For a given processor implementation the
> > > primary
> > > factors are:
> > > variation. In pathological cases this variation can be
> > > significant,
> > > but typically it is of a much lesser impact than the factors
> > > above.
> > >
> > > -A high level dynamic power consumption model may then be
> > > represented
> > > as:
> > > +A high level dynamic power consumption model may then be
> > > represented
> > > as::
> > >
> > > -Pdyn = f(run) * Voltage^2 * Frequency * Utilisation
> > > + Pdyn = f(run) * Voltage^2 * Frequency * Utilisation
> > >
> > > f(run) here represents the described execution behaviour and its
> > > result has a units of Watts/Hz/Volt^2 (this often expressed in
> > > @@ -80,9 +95,9 @@ factors. Therefore, in initial implementation
> > > that
> > > contribution is
> > > represented as a constant coefficient. This is a simplification
> > > consistent with the relative contribution to overall power
> > > variation.
> > >
> > > -In this simplified representation our model becomes:
> > > +In this simplified representation our model becomes::
> > >
> > > -Pdyn = Capacitance * Voltage^2 * Frequency * Utilisation
> > > + Pdyn = Capacitance * Voltage^2 * Frequency * Utilisation
> > >
> > > Where `capacitance` is a constant that represents an indicative
> > > running time dynamic power coefficient in fundamental units of
> > > diff --git a/Documentation/thermal/exynos_thermal
> > > b/Documentation/thermal/exynos_thermal.rst
> > > similarity index 67%
> > > rename from Documentation/thermal/exynos_thermal
> > > rename to Documentation/thermal/exynos_thermal.rst
> > > index 9010c4416967..5bd556566c70 100644
> > > --- a/Documentation/thermal/exynos_thermal
> > > +++ b/Documentation/thermal/exynos_thermal.rst
> > > @@ -1,8 +1,11 @@
> > > +========================
> > > Kernel driver exynos_tmu
> > > -=================
> > > +========================
> > >
> > > Supported chips:
> > > +
> > > * ARM SAMSUNG EXYNOS4, EXYNOS5 series of SoC
> > > +
> > > Datasheet: Not publicly available
> > >
> > > Authors: Donggeun Kim <dg77.kim@...sung.com>
> > > @@ -19,32 +22,39 @@ Temperature can be taken from the temperature
> > > code.
> > > There are three equations converting from temperature to
> > > temperature
> > > code.
> > >
> > > The three equations are:
> > > - 1. Two point trimming
> > > + 1. Two point trimming::
> > > +
> > > Tc = (T - 25) * (TI2 - TI1) / (85 - 25) + TI1
> > >
> > > - 2. One point trimming
> > > + 2. One point trimming::
> > > +
> > > Tc = T + TI1 - 25
> > >
> > > - 3. No trimming
> > > + 3. No trimming::
> > > +
> > > Tc = T + 50
> > >
> > > - Tc: Temperature code, T: Temperature,
> > > - TI1: Trimming info for 25 degree Celsius (stored at TRIMINFO
> > > register)
> > > + Tc:
> > > + Temperature code, T: Temperature,
> > > + TI1:
> > > + Trimming info for 25 degree Celsius (stored at TRIMINFO
> > > register)
> > > Temperature code measured at 25 degree Celsius which is
> > > unchanged
> > > - TI2: Trimming info for 85 degree Celsius (stored at TRIMINFO
> > > register)
> > > + TI2:
> > > + Trimming info for 85 degree Celsius (stored at TRIMINFO
> > > register)
> > > Temperature code measured at 85 degree Celsius which is
> > > unchanged
> > >
> > > TMU(Thermal Management Unit) in EXYNOS4/5 generates interrupt
> > > when temperature exceeds pre-defined levels.
> > > The maximum number of configurable threshold is five.
> > > -The threshold levels are defined as follows:
> > > +The threshold levels are defined as follows::
> > > +
> > > Level_0: current temperature > trigger_level_0 + threshold
> > > Level_1: current temperature > trigger_level_1 + threshold
> > > Level_2: current temperature > trigger_level_2 + threshold
> > > Level_3: current temperature > trigger_level_3 + threshold
> > >
> > > - The threshold and each trigger_level are set
> > > - through the corresponding registers.
> > > +The threshold and each trigger_level are set
> > > +through the corresponding registers.
> > >
> > > When an interrupt occurs, this driver notify kernel thermal
> > > framework
> > > with the function exynos_report_trigger.
> > > @@ -54,24 +64,27 @@ it can be used to synchronize the cooling
> > > action.
> > > TMU driver description:
> > > -----------------------
> > >
> > > -The exynos thermal driver is structured as,
> > > +The exynos thermal driver is structured as::
> > >
> > > Kernel Core thermal
> > > framework
> > > (thermal_core.c, step_wise.c,
> > > cpu_cooling.c)
> > >
> > > ^
> > >
> > > |
> > >
> > > |
> > > -TMU configuration data -------> TMU Driver <------> Exynos Core
> > > thermal wrapper
> > > -(exynos_tmu_data.c) (exynos_tmu.c) (exyno
> > > s_th
> > > ermal_common.c)
> > > -(exynos_tmu_data.h) (exynos_tmu.h) (exyno
> > > s_th
> > > ermal_common.h)
> > > + TMU configuration data -----> TMU Driver <----> Exynos Core
> > > thermal wrapper
> > > + (exynos_tmu_data.c) (exynos_tmu.c) (exy
> > > nos_
> > > thermal_common.c)
> > > + (exynos_tmu_data.h) (exynos_tmu.h) (exy
> > > nos_
> > > thermal_common.h)
> > >
> > > -a) TMU configuration data: This consist of TMU register
> > > offsets/bitfields
> > > +a) TMU configuration data:
> > > + This consist of TMU register offsets/bitfields
> > > described through structure
> > > exynos_tmu_registers.
> > > Also several
> > > other platform data (struct
> > > exynos_tmu_platform_data) members
> > > are used to configure the TMU.
> > > -b) TMU driver: This component initialises the TMU controller and
> > > sets different
> > > +b) TMU driver:
> > > + This component initialises the TMU controller
> > > and
> > > sets different
> > > thresholds. It invokes core thermal
> > > implementation
> > > with the call
> > > exynos_report_trigger.
> > > -c) Exynos Core thermal wrapper: This provides 3 wrapper function
> > > to
> > > use the
> > > +c) Exynos Core thermal wrapper:
> > > + This provides 3 wrapper function to use the
> > > Kernel core thermal framework. They are
> > > exynos_unregister_thermal,
> > > exynos_register_thermal and
> > > exynos_report_trigger.
> > > diff --git a/Documentation/thermal/exynos_thermal_emulation
> > > b/Documentation/thermal/exynos_thermal_emulation.rst
> > > similarity index 36%
> > > rename from Documentation/thermal/exynos_thermal_emulation
> > > rename to Documentation/thermal/exynos_thermal_emulation.rst
> > > index b15efec6ca28..c21d10838bc5 100644
> > > --- a/Documentation/thermal/exynos_thermal_emulation
> > > +++ b/Documentation/thermal/exynos_thermal_emulation.rst
> > > @@ -1,5 +1,6 @@
> > > -EXYNOS EMULATION MODE
> > > -========================
> > > +=====================
> > > +Exynos Emulation Mode
> > > +=====================
> > >
> > > Copyright (C) 2012 Samsung Electronics
> > >
> > > @@ -8,46 +9,53 @@ Written by Jonghwa Lee <jonghwa3.lee@...sung.co
> > > m>
> > > Description
> > > -----------
> > >
> > > -Exynos 4x12 (4212, 4412) and 5 series provide emulation mode for
> > > thermal management unit.
> > > -Thermal emulation mode supports software debug for TMU's
> > > operation.
> > > User can set temperature
> > > -manually with software code and TMU will read current
> > > temperature
> > > from user value not from
> > > -sensor's value.
> > > +Exynos 4x12 (4212, 4412) and 5 series provide emulation mode for
> > > thermal
> > > +management unit. Thermal emulation mode supports software debug
> > > for
> > > +TMU's operation. User can set temperature manually with software
> > > code
> > > +and TMU will read current temperature from user value not from
> > > sensor's
> > > +value.
> > >
> > > -Enabling CONFIG_THERMAL_EMULATION option will make this support
> > > available.
> > > -When it's enabled, sysfs node will be created as
> > > +Enabling CONFIG_THERMAL_EMULATION option will make this support
> > > +available. When it's enabled, sysfs node will be created as
> > > /sys/devices/virtual/thermal/thermal_zone'zone id'/emul_temp.
> > >
> > > -The sysfs node, 'emul_node', will contain value 0 for the
> > > initial
> > > state. When you input any
> > > -temperature you want to update to sysfs node, it automatically
> > > enable emulation mode and
> > > -current temperature will be changed into it.
> > > -(Exynos also supports user changeable delay time which would be
> > > used
> > > to delay of
> > > - changing temperature. However, this node only uses same delay
> > > of
> > > real sensing time, 938us.)
> > > +The sysfs node, 'emul_node', will contain value 0 for the
> > > initial
> > > state.
> > > +When you input any temperature you want to update to sysfs node,
> > > it
> > > +automatically enable emulation mode and current temperature will
> > > be
> > > +changed into it.
> > >
> > > -Exynos emulation mode requires synchronous of value changing and
> > > enabling. It means when you
> > > -want to update the any value of delay or next temperature, then
> > > you
> > > have to enable emulation
> > > -mode at the same time. (Or you have to keep the mode enabling.)
> > > If
> > > you don't, it fails to
> > > -change the value to updated one and just use last succeessful
> > > value
> > > repeatedly. That's why
> > > -this node gives users the right to change termerpature only.
> > > Just
> > > one interface makes it more
> > > -simply to use.
> > > +(Exynos also supports user changeable delay time which would be
> > > used
> > > to
> > > +delay of changing temperature. However, this node only uses same
> > > delay
> > > +of real sensing time, 938us.)
> > > +
> > > +Exynos emulation mode requires synchronous of value changing and
> > > +enabling. It means when you want to update the any value of
> > > delay or
> > > +next temperature, then you have to enable emulation mode at the
> > > same
> > > +time. (Or you have to keep the mode enabling.) If you don't, it
> > > fails to
> > > +change the value to updated one and just use last succeessful
> > > value
> > > +repeatedly. That's why this node gives users the right to change
> > > +termerpature only. Just one interface makes it more simply to
> > > use.
> > >
> > > Disabling emulation mode only requires writing value 0 to sysfs
> > > node.
> > >
> > > +::
> > >
> > > -TEMP 120 |
> > > +
> > > + TEMP 120 |
> > > |
> > > 100 |
> > > |
> > > 80 |
> > > - | +-----------
> > > - 60 | | |
> > > - | +-------------| |
> > > + | +-----------
> > > + 60 | | |
> > > + | +-------------| |
> > > 40 | | | |
> > > - | | |
> > > |
> > > - 20 | | |
> > > +-
> > > ---------
> > > - | | |
> > > |
> > > |
> > > + | | | |
> > > + 20 | | | +
> > > ----
> > > ------
> > > + | | | |
> > >
> > > |
> > > 0
> > > >
> > > > ______________|_____________|__________|__________|_________
> > > - A A A
> > >
> > > A TIME
> > > + A A A
> > >
> > > A TIME
> > > |<----->| |<----->| |<----->|
> > >
> > > |
> > > | 938us | | | | |
> > >
> > > |
> > > -emulation : 0 50 | 70 | 20 |
> > >
> > > 0
> > > -current temp : sensor 50 70 20
> > >
> > > sensor
> > > + emulation : 0 50 | 70 | 20 |
> > >
> > > 0
> > > + current temp: sensor 50 70 20
> > >
> > > sensor
> > > diff --git a/Documentation/thermal/index.rst
> > > b/Documentation/thermal/index.rst
> > > new file mode 100644
> > > index 000000000000..8c1c00146cad
> > > --- /dev/null
> > > +++ b/Documentation/thermal/index.rst
> > > @@ -0,0 +1,18 @@
> > > +:orphan:
> > > +
> > > +=======
> > > +Thermal
> > > +=======
> > > +
> > > +.. toctree::
> > > + :maxdepth: 1
> > > +
> > > + cpu-cooling-api
> > > + sysfs-api
> > > + power_allocator
> > > +
> > > + exynos_thermal
> > > + exynos_thermal_emulation
> > > + intel_powerclamp
> > > + nouveau_thermal
> > > + x86_pkg_temperature_thermal
> > > diff --git a/Documentation/thermal/intel_powerclamp.txt
> > > b/Documentation/thermal/intel_powerclamp.rst
> > > similarity index 76%
> > > rename from Documentation/thermal/intel_powerclamp.txt
> > > rename to Documentation/thermal/intel_powerclamp.rst
> > > index b5df21168fbc..3f6dfb0b3ea6 100644
> > > --- a/Documentation/thermal/intel_powerclamp.txt
> > > +++ b/Documentation/thermal/intel_powerclamp.rst
> > > @@ -1,10 +1,13 @@
> > > - =======================
> > > - INTEL POWERCLAMP DRIVER
> > > - =======================
> > > -By: Arjan van de Ven <arjan@...ux.intel.com>
> > > - Jacob Pan <jacob.jun.pan@...ux.intel.com>
> > > +=======================
> > > +Intel Powerclamp Driver
> > > +=======================
> > > +
> > > +By:
> > > + - Arjan van de Ven <arjan@...ux.intel.com>
> > > + - Jacob Pan <jacob.jun.pan@...ux.intel.com>
> > > +
> > > +.. Contents:
> > >
> > > -Contents:
> > > (*) Introduction
> > > - Goals and Objectives
> > >
> > > @@ -23,7 +26,6 @@ Contents:
> > > - Generic Thermal Layer (sysfs)
> > > - Kernel APIs (TBD)
> > >
> > > -============
> > > INTRODUCTION
> > > ============
> > >
> > > @@ -47,7 +49,6 @@ scalability, and user experience. In many
> > > cases,
> > > clear advantage is
> > > shown over taking the CPU offline or modulating the CPU clock.
> > >
> > >
> > > -===================
> > > THEORY OF OPERATION
> > > ===================
> > >
> > > @@ -57,11 +58,12 @@ Idle Injection
> > > On modern Intel processors (Nehalem or later), package level C-
> > > state
> > > residency is available in MSRs, thus also available to the
> > > kernel.
> > >
> > > -These MSRs are:
> > > - #define MSR_PKG_C2_RESIDENCY 0x60D
> > > - #define MSR_PKG_C3_RESIDENCY 0x3F8
> > > - #define MSR_PKG_C6_RESIDENCY 0x3F9
> > > - #define MSR_PKG_C7_RESIDENCY 0x3FA
> > > +These MSRs are::
> > > +
> > > + #define MSR_PKG_C2_RESIDENCY 0x60D
> > > + #define MSR_PKG_C3_RESIDENCY 0x3F8
> > > + #define MSR_PKG_C6_RESIDENCY 0x3F9
> > > + #define MSR_PKG_C7_RESIDENCY 0x3FA
> > >
> > > If the kernel can also inject idle time to the system, then a
> > > closed-loop control system can be established that manages
> > > package
> > > @@ -96,19 +98,21 @@ are not masked. Tests show that the extra
> > > wakeups
> > > from scheduler tick
> > > have a dramatic impact on the effectiveness of the powerclamp
> > > driver
> > > on large scale systems (Westmere system with 80 processors).
> > >
> > > -CPU0
> > > - ____________ ____________
> > > -kidle_inject/0 | sleep | mwait | sleep |
> > > - _________| |________| |_______
> > > - duration
> > > -CPU1
> > > - ____________ ____________
> > > -kidle_inject/1 | sleep | mwait | sleep |
> > > - _________| |________| |_______
> > > - ^
> > > - |
> > > - |
> > > - roundup(jiffies, interval)
> > > +::
> > > +
> > > + CPU0
> > > + ____________ ____________
> > > + kidle_inject/0 | sleep | mwait | sleep |
> > > + _________| |________| |_______
> > > + duration
> > > + CPU1
> > > + ____________ ____________
> > > + kidle_inject/1 | sleep | mwait | sleep |
> > > + _________| |________| |_______
> > > + ^
> > > + |
> > > + |
> > > + roundup(jiffies, interval)
> > >
> > > Only one CPU is allowed to collect statistics and update global
> > > control parameters. This CPU is referred to as the controlling
> > > CPU
> > > in
> > > @@ -148,7 +152,7 @@ b) determine the amount of compensation
> > > needed at
> > > each target ratio
> > >
> > > Compensation to each target ratio consists of two parts:
> > >
> > > - a) steady state error compensation
> > > + a) steady state error compensation
> > > This is to offset the error occurring when the system
> > > can
> > > enter idle without extra wakeups (such as external
> > > interrupts).
> > >
> > > @@ -158,41 +162,42 @@ Compensation to each target ratio consists
> > > of
> > > two parts:
> > > slowing down CPU activities.
> > >
> > > A debugfs file is provided for the user to examine compensation
> > > -progress and results, such as on a Westmere system.
> > > -[jacob@...01 ~]$ cat
> > > -/sys/kernel/debug/intel_powerclamp/powerclamp_calib
> > > -controlling cpu: 0
> > > -pct confidence steady dynamic (compensation)
> > > -0 0 0 0
> > > -1 1 0 0
> > > -2 1 1 0
> > > -3 3 1 0
> > > -4 3 1 0
> > > -5 3 1 0
> > > -6 3 1 0
> > > -7 3 1 0
> > > -8 3 1 0
> > > -...
> > > -30 3 2 0
> > > -31 3 2 0
> > > -32 3 1 0
> > > -33 3 2 0
> > > -34 3 1 0
> > > -35 3 2 0
> > > -36 3 1 0
> > > -37 3 2 0
> > > -38 3 1 0
> > > -39 3 2 0
> > > -40 3 3 0
> > > -41 3 1 0
> > > -42 3 2 0
> > > -43 3 1 0
> > > -44 3 1 0
> > > -45 3 2 0
> > > -46 3 3 0
> > > -47 3 0 0
> > > -48 3 2 0
> > > -49 3 3 0
> > > +progress and results, such as on a Westmere system::
> > > +
> > > + [jacob@...01 ~]$ cat
> > > + /sys/kernel/debug/intel_powerclamp/powerclamp_calib
> > > + controlling cpu: 0
> > > + pct confidence steady dynamic (compensation)
> > > + 0 0 0 0
> > > + 1 1 0 0
> > > + 2 1 1 0
> > > + 3 3 1 0
> > > + 4 3 1 0
> > > + 5 3 1 0
> > > + 6 3 1 0
> > > + 7 3 1 0
> > > + 8 3 1 0
> > > + ...
> > > + 30 3 2 0
> > > + 31 3 2 0
> > > + 32 3 1 0
> > > + 33 3 2 0
> > > + 34 3 1 0
> > > + 35 3 2 0
> > > + 36 3 1 0
> > > + 37 3 2 0
> > > + 38 3 1 0
> > > + 39 3 2 0
> > > + 40 3 3 0
> > > + 41 3 1 0
> > > + 42 3 2 0
> > > + 43 3 1 0
> > > + 44 3 1 0
> > > + 45 3 2 0
> > > + 46 3 3 0
> > > + 47 3 0 0
> > > + 48 3 2 0
> > > + 49 3 3 0
> > >
> > > Calibration occurs during runtime. No offline method is
> > > available.
> > > Steady state compensation is used only when confidence levels of
> > > all
> > > @@ -217,9 +222,8 @@ keeps track of clamping kernel threads, even
> > > after they are migrated
> > > to other CPUs, after a CPU offline event.
> > >
> > >
> > > -=====================
> > > Performance Analysis
> > > -=====================
> > > +====================
> > > This section describes the general performance data collected on
> > > multiple systems, including Westmere (80P) and Ivy Bridge (4P,
> > > 8P).
> > >
> > > @@ -257,16 +261,15 @@ achieve up to 40% better performance per
> > > watt.
> > > (measured by a spin
> > > counter summed over per CPU counting threads spawned for all
> > > running
> > > CPUs).
> > >
> > > -====================
> > > Usage and Interfaces
> > > ====================
> > > The powerclamp driver is registered to the generic thermal layer
> > > as
> > > a
> > > -cooling device. Currently, it’s not bound to any thermal zones.
> > > +cooling device. Currently, it’s not bound to any thermal zones::
> > >
> > > -jacob@...omoly:/sys/class/thermal/cooling_device14$ grep . *
> > > -cur_state:0
> > > -max_state:50
> > > -type:intel_powerclamp
> > > + jacob@...omoly:/sys/class/thermal/cooling_device14$ grep . *
> > > + cur_state:0
> > > + max_state:50
> > > + type:intel_powerclamp
> > >
> > > cur_state allows user to set the desired idle percentage.
> > > Writing 0
> > > to
> > > cur_state will stop idle injection. Writing a value between 1
> > > and
> > > @@ -278,9 +281,9 @@ cur_state returns value -1 instead of 0 which
> > > is
> > > to avoid confusing
> > > 100% busy state with the disabled state.
> > >
> > > Example usage:
> > > -- To inject 25% idle time
> > > -$ sudo sh -c "echo 25 >
> > > /sys/class/thermal/cooling_device80/cur_state
> > > -"
> > > +- To inject 25% idle time::
> > > +
> > > + $ sudo sh -c "echo 25 >
> > > /sys/class/thermal/cooling_device80/cur_state
> > >
> > > If the system is not busy and has more than 25% idle time
> > > already,
> > > then the powerclamp driver will not start idle injection. Using
> > > Top
> > > @@ -292,23 +295,23 @@ idle time is accounted as normal idle in
> > > that
> > > common code path is
> > > taken as the idle task.
> > >
> > > In this example, 24.1% idle is shown. This helps the system
> > > admin or
> > > -user determine the cause of slowdown, when a powerclamp driver
> > > is in
> > > action.
> > > +user determine the cause of slowdown, when a powerclamp driver
> > > is in
> > > action::
> > >
> > >
> > > -Tasks: 197 total, 1 running, 196 sleeping, 0 stopped, 0
> > > zombie
> > > -Cpu(s): 71.2%us, 4.7%sy, 0.0%ni,
> > > 24.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
> > > -Mem: 3943228k total, 1689632k used, 2253596k free, 74960k
> > > buffers
> > > -Swap: 4087804k total, 0k used, 4087804k free, 945336k
> > > cached
> > > + Tasks: 197 total, 1 running, 196 sleeping, 0 stopped, 0
> > > zombie
> > > + Cpu(s): 71.2%us, 4.7%sy, 0.0%ni,
> > > 24.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
> > > + Mem: 3943228k total, 1689632k used, 2253596k
> > > free, 74960k
> > > buffers
> > > + Swap: 4087804k total, 0k used, 4087804k
> > > free, 945336k
> > > cached
> > >
> > > - PID USER PR NI VIRT RES SHR S %CPU
> > > %MEM TIME+ COMMAND
> > > - 3352 jacob 20 0 262m 644 428 S 286 0.0 0:17.16
> > > spin
> > > - 3341 root -51 0 0 0 0 D 25 0.0 0:01.62
> > > kidle_inject/0
> > > - 3344 root -51 0 0 0 0 D 25 0.0 0:01.60
> > > kidle_inject/3
> > > - 3342 root -51 0 0 0 0 D 25 0.0 0:01.61
> > > kidle_inject/1
> > > - 3343 root -51 0 0 0 0 D 25 0.0 0:01.60
> > > kidle_inject/2
> > > - 2935 jacob 20 0 696m 125m 35m S 5 3.3 0:31.11
> > > firefox
> > > - 1546 root 20 0 158m 20m 6640 S 3 0.5 0:26.97
> > > Xorg
> > > - 2100 jacob 20 0 1223m 88m 30m S 3 2.3 0:23.68
> > > compiz
> > > + PID USER PR NI VIRT RES SHR S %CPU
> > > %MEM TIME+ COMMAND
> > > + 3352 jacob 20 0 262m 644 428 S 286 0.0 0:17.16
> > > spin
> > > + 3341 root -51 0 0 0 0 D 25 0.0 0:01.62
> > > kidle_inject/0
> > > + 3344 root -51 0 0 0 0 D 25 0.0 0:01.60
> > > kidle_inject/3
> > > + 3342 root -51 0 0 0 0 D 25 0.0 0:01.61
> > > kidle_inject/1
> > > + 3343 root -51 0 0 0 0 D 25 0.0 0:01.60
> > > kidle_inject/2
> > > + 2935 jacob 20 0 696m 125m 35m S 5 3.3 0:31.11
> > > firefox
> > > + 1546 root 20 0 158m 20m 6640 S 3 0.5 0:26.97
> > > Xorg
> > > + 2100 jacob 20 0 1223m 88m 30m S 3 2.3 0:23.68
> > > compiz
> > >
> > > Tests have shown that by using the powerclamp driver as a
> > > cooling
> > > device, a PID based userspace thermal controller can manage to
> > > diff --git a/Documentation/thermal/nouveau_thermal
> > > b/Documentation/thermal/nouveau_thermal.rst
> > > similarity index 64%
> > > rename from Documentation/thermal/nouveau_thermal
> > > rename to Documentation/thermal/nouveau_thermal.rst
> > > index 6e17a11efcb0..37255fd6735d 100644
> > > --- a/Documentation/thermal/nouveau_thermal
> > > +++ b/Documentation/thermal/nouveau_thermal.rst
> > > @@ -1,13 +1,15 @@
> > > +=====================
> > > Kernel driver nouveau
> > > -===================
> > > +=====================
> > >
> > > Supported chips:
> > > +
> > > * NV43+
> > >
> > > Authors: Martin Peres (mupuf) <martin.peres@...e.fr>
> > >
> > > Description
> > > ----------
> > > +-----------
> > >
> > > This driver allows to read the GPU core temperature, drive the
> > > GPU
> > > fan and
> > > set temperature alarms.
> > > @@ -19,20 +21,25 @@ interface is likely not to work. This
> > > document
> > > may then not cover your situation
> > > entirely.
> > >
> > > Temperature management
> > > ---------------------
> > > +----------------------
> > >
> > > Temperature is exposed under as a read-only HWMON attribute
> > > temp1_input.
> > >
> > > In order to protect the GPU from overheating, Nouveau supports 4
> > > configurable
> > > temperature thresholds:
> > >
> > > - * Fan_boost: Fan speed is set to 100% when reaching this
> > > temperature;
> > > - * Downclock: The GPU will be downclocked to reduce its power
> > > dissipation;
> > > - * Critical: The GPU is put on hold to further lower power
> > > dissipation;
> > > - * Shutdown: Shut the computer down to protect your GPU.
> > > + * Fan_boost:
> > > + Fan speed is set to 100% when reaching this temperature;
> > > + * Downclock:
> > > + The GPU will be downclocked to reduce its power
> > > dissipation;
> > > + * Critical:
> > > + The GPU is put on hold to further lower power
> > > dissipation;
> > > + * Shutdown:
> > > + Shut the computer down to protect your GPU.
> > >
> > > -WARNING: Some of these thresholds may not be used by Nouveau
> > > depending
> > > -on your chipset.
> > > +WARNING:
> > > + Some of these thresholds may not be used by Nouveau
> > > depending
> > > + on your chipset.
> > >
> > > The default value for these thresholds comes from the GPU's
> > > vbios.
> > > These
> > > thresholds can be configured thanks to the following HWMON
> > > attributes:
> > > @@ -46,19 +53,24 @@ NOTE: Remember that the values are stored as
> > > milli degrees Celsius. Don't forget
> > > to multiply!
> > >
> > > Fan management
> > > -------------
> > > +--------------
> > >
> > > Not all cards have a drivable fan. If you do, then the following
> > > HWMON
> > > attributes should be available:
> > >
> > > - * pwm1_enable: Current fan management mode (NONE, MANUAL or
> > > AUTO);
> > > - * pwm1: Current PWM value (power percentage);
> > > - * pwm1_min: The minimum PWM speed allowed;
> > > - * pwm1_max: The maximum PWM speed allowed (bypassed when
> > > hitting
> > > Fan_boost);
> > > + * pwm1_enable:
> > > + Current fan management mode (NONE, MANUAL or AUTO);
> > > + * pwm1:
> > > + Current PWM value (power percentage);
> > > + * pwm1_min:
> > > + The minimum PWM speed allowed;
> > > + * pwm1_max:
> > > + The maximum PWM speed allowed (bypassed when hitting
> > > Fan_boost);
> > >
> > > You may also have the following attribute:
> > >
> > > - * fan1_input: Speed in RPM of your fan.
> > > + * fan1_input:
> > > + Speed in RPM of your fan.
> > >
> > > Your fan can be driven in different modes:
> > >
> > > @@ -66,14 +78,16 @@ Your fan can be driven in different modes:
> > > * 1: The fan can be driven in manual (use pwm1 to change the
> > > speed);
> > > * 2; The fan is driven automatically depending on the
> > > temperature.
> > >
> > > -NOTE: Be sure to use the manual mode if you want to drive the
> > > fan
> > > speed manually
> > > +NOTE:
> > > + Be sure to use the manual mode if you want to drive the fan
> > > speed
> > > manually
> > >
> > > -NOTE2: When operating in manual mode outside the vbios-defined
> > > -[PWM_min, PWM_max] range, the reported fan speed (RPM) may not
> > > be
> > > accurate
> > > -depending on your hardware.
> > > +NOTE2:
> > > + When operating in manual mode outside the vbios-defined
> > > + [PWM_min, PWM_max] range, the reported fan speed (RPM) may not
> > > be
> > > accurate
> > > + depending on your hardware.
> > >
> > > Bug reports
> > > ----------
> > > +-----------
> > >
> > > Thermal management on Nouveau is new and may not work on all
> > > cards.
> > > If you have
> > > inquiries, please ping mupuf on IRC (#nouveau, freenode).
> > > diff --git a/Documentation/thermal/power_allocator.txt
> > > b/Documentation/thermal/power_allocator.rst
> > > similarity index 74%
> > > rename from Documentation/thermal/power_allocator.txt
> > > rename to Documentation/thermal/power_allocator.rst
> > > index 9fb0ff06dca9..67b6a3297238 100644
> > > --- a/Documentation/thermal/power_allocator.txt
> > > +++ b/Documentation/thermal/power_allocator.rst
> > > @@ -1,3 +1,4 @@
> > > +=================================
> > > Power allocator governor tunables
> > > =================================
> > >
> > > @@ -25,36 +26,36 @@ temperature as the control input and power as
> > > the
> > > controlled output:
> > > P_max = k_p * e + k_i * err_integral + k_d * diff_err +
> > > sustainable_power
> > >
> > > where
> > > - e = desired_temperature - current_temperature
> > > - err_integral is the sum of previous errors
> > > - diff_err = e - previous_error
> > > + - e = desired_temperature - current_temperature
> > > + - err_integral is the sum of previous errors
> > > + - diff_err = e - previous_error
> > >
> > > -It is similar to the one depicted below:
> > > +It is similar to the one depicted below::
> > >
> > > - k_d
> > > - |
> > > -current_temp |
> > > - | v
> > > - | +----------+ +---+
> > > - | +----->| diff_err |-->| X |------+
> > > - | | +----------+ +---+ |
> > > - | | | tdp
> > > ac
> > > tor
> > > - | | k_i | | get_r
> > > eque
> > > sted_power()
> > > - | | | | |
> > > |
> > > |
> > > - | | | | |
> > > |
> > > | ...
> > > - v | v v v
> > > v
> > > v
> > > - +---+ | +-------+ +---+ +---+ +---+ +-
> > > ----
> > > -----+
> > > - | S |-------+----->| sum e |----->| X |--->| S |-->| S |
> > > -->|power |
> > > - +---+ | +-------+ +---+ +---+ +---
> > > + |allocation|
> > > - ^ | ^ +-
> > > ----
> > > -----+
> > > - | | |
> > > |
> > > |
> > > - | | +---
> > > + | | |
> > > - | +------->| X |-------------------
> > > + v v
> > > - | +---
> > > + granted
> > > performance
> > > -desired_temperature ^
> > > - |
> > > - |
> > > - k_po/k_pu
> > > + k_d
> > > + |
> > > + current_temp |
> > > + | v
> > > + | +----------+ +---+
> > > + | +----->| diff_err |-->| X |------+
> > > + | | +----------+ +---+ |
> > > + | | | tdp
> > > ac
> > > tor
> > > + | | k_i | | get_r
> > > eque
> > > sted_power()
> > > + | | | | |
> > > |
> > > |
> > > + | | | | |
> > > |
> > > | ...
> > > + v | v v v
> > > v
> > > v
> > > + +---+ | +-------+ +---+ +---+ +---+ +-
> > > ----
> > > -----+
> > > + | S |-----+----->| sum e |----->| X |--->| S |-->| S |
> > > -->|power |
> > > + +---+ | +-------+ +---+ +---+ +---
> > > + |allocation|
> > > + ^ | ^ +-
> > > ----
> > > -----+
> > > + | | |
> > > |
> > > |
> > > + | | +---
> > > + | | |
> > > + | +------->| X |-------------------
> > > + v v
> > > + | +---
> > > + granted
> > > performance
> > > + desired_temperature ^
> > > + |
> > > + |
> > > + k_po/k_pu
> > >
> > > Sustainable power
> > > -----------------
> > > @@ -73,7 +74,7 @@ is typically 2000mW, while on a 10" tablet is
> > > around 4500mW (may vary
> > > depending on screen size).
> > >
> > > If you are using device tree, do add it as a property of the
> > > -thermal-zone. For example:
> > > +thermal-zone. For example::
> > >
> > > thermal-zones {
> > > soc_thermal {
> > > @@ -85,7 +86,7 @@ thermal-zone. For example:
> > > Instead, if the thermal zone is registered from the platform
> > > code,
> > > pass a
> > > `thermal_zone_params` that has a `sustainable_power`. If no
> > > `thermal_zone_params` were being passed, then something like
> > > below
> > > -will suffice:
> > > +will suffice::
> > >
> > > static const struct thermal_zone_params tz_params = {
> > > .sustainable_power = 3500,
> > > @@ -112,18 +113,18 @@ available capacity at a low
> > > temperature. On
> > > the other hand, a high
> > > value of `k_pu` will result in the governor granting very high
> > > power
> > > while temperature is low, and may lead to temperature
> > > overshooting.
> > >
> > > -The default value for `k_pu` is:
> > > +The default value for `k_pu` is::
> > >
> > > 2 * sustainable_power / (desired_temperature -
> > > switch_on_temp)
> > >
> > > This means that at `switch_on_temp` the output of the
> > > controller's
> > > proportional term will be 2 * `sustainable_power`. The default
> > > value
> > > -for `k_po` is:
> > > +for `k_po` is::
> > >
> > > sustainable_power / (desired_temperature - switch_on_temp)
> > >
> > > Focusing on the proportional and feed forward values of the PID
> > > -controller equation we have:
> > > +controller equation we have::
> > >
> > > P_max = k_p * e + sustainable_power
> > >
> > > @@ -134,21 +135,23 @@ is the desired one, then the proportional
> > > component is zero and
> > > thermal equilibrium under constant load. `sustainable_power` is
> > > only
> > > an estimate, which is the reason for closed-loop control such as
> > > this.
> > >
> > > -Expanding `k_pu` we get:
> > > +Expanding `k_pu` we get::
> > > +
> > > P_max = 2 * sustainable_power * (T_set - T) / (T_set - T_on)
> > > +
> > > - sustainable_power
> > > + sustainable_power
> > >
> > > -where
> > > - T_set is the desired temperature
> > > - T is the current temperature
> > > - T_on is the switch on temperature
> > > +where:
> > > +
> > > + - T_set is the desired temperature
> > > + - T is the current temperature
> > > + - T_on is the switch on temperature
> > >
> > > When the current temperature is the switch_on temperature, the
> > > above
> > > -formula becomes:
> > > +formula becomes::
> > >
> > > P_max = 2 * sustainable_power * (T_set - T_on) / (T_set -
> > > T_on)
> > > +
> > > - sustainable_power = 2 * sustainable_power +
> > > sustainable_power =
> > > - 3 * sustainable_power
> > > + sustainable_power = 2 * sustainable_power +
> > > sustainable_power =
> > > + 3 * sustainable_power
> > >
> > > Therefore, the proportional term alone linearly decreases power
> > > from
> > > 3 * `sustainable_power` to `sustainable_power` as the
> > > temperature
> > > @@ -178,11 +181,18 @@ Cooling device power API
> > > Cooling devices controlled by this governor must supply the
> > > additional
> > > "power" API in their `cooling_device_ops`. It consists on three
> > > ops:
> > >
> > > -1. int get_requested_power(struct thermal_cooling_device *cdev,
> > > - struct thermal_zone_device *tz, u32 *power);
> > > -@...v: The `struct thermal_cooling_device` pointer
> > > -@tz: thermal zone in which we are currently operating
> > > -@...er: pointer in which to store the calculated power
> > > +1. ::
> > > +
> > > + int get_requested_power(struct thermal_cooling_device *cdev,
> > > + struct thermal_zone_device *tz, u32
> > > *power);
> > > +
> > > +
> > > +@...v:
> > > + The `struct thermal_cooling_device` pointer
> > > +@tz:
> > > + thermal zone in which we are currently operating
> > > +@...er:
> > > + pointer in which to store the calculated power
> > >
> > > `get_requested_power()` calculates the power requested by the
> > > device
> > > in milliwatts and stores it in @power . It should return 0 on
> > > @@ -190,23 +200,37 @@ success, -E* on failure. This is currently
> > > used by the power
> > > allocator governor to calculate how much power to give to each
> > > cooling
> > > device.
> > >
> > > -2. int state2power(struct thermal_cooling_device *cdev, struct
> > > - thermal_zone_device *tz, unsigned long state, u32
> > > *power);
> > > -@...v: The `struct thermal_cooling_device` pointer
> > > -@tz: thermal zone in which we are currently operating
> > > -@...te: A cooling device state
> > > -@...er: pointer in which to store the equivalent power
> > > +2. ::
> > > +
> > > + int state2power(struct thermal_cooling_device *cdev,
> > > struct
> > > + thermal_zone_device *tz, unsigned long
> > > state,
> > > + u32 *power);
> > > +
> > > +@...v:
> > > + The `struct thermal_cooling_device` pointer
> > > +@tz:
> > > + thermal zone in which we are currently operating
> > > +@...te:
> > > + A cooling device state
> > > +@...er:
> > > + pointer in which to store the equivalent power
> > >
> > > Convert cooling device state @state into power consumption in
> > > milliwatts and store it in @power. It should return 0 on
> > > success,
> > > -E*
> > > on failure. This is currently used by thermal core to calculate
> > > the
> > > maximum power that an actor can consume.
> > >
> > > -3. int power2state(struct thermal_cooling_device *cdev, u32
> > > power,
> > > - unsigned long *state);
> > > -@...v: The `struct thermal_cooling_device` pointer
> > > -@...er: power in milliwatts
> > > -@...te: pointer in which to store the resulting state
> > > +3. ::
> > > +
> > > + int power2state(struct thermal_cooling_device *cdev, u32
> > > power,
> > > + unsigned long *state);
> > > +
> > > +@...v:
> > > + The `struct thermal_cooling_device` pointer
> > > +@...er:
> > > + power in milliwatts
> > > +@...te:
> > > + pointer in which to store the resulting state
> > >
> > > Calculate a cooling device state that would make the device
> > > consume
> > > at
> > > most @power mW and store it in @state. It should return 0 on
> > > success,
> > > diff --git a/Documentation/thermal/sysfs-api.txt
> > > b/Documentation/thermal/sysfs-api.rst
> > > similarity index 66%
> > > rename from Documentation/thermal/sysfs-api.txt
> > > rename to Documentation/thermal/sysfs-api.rst
> > > index c3fa500df92c..e4930761d3e5 100644
> > > --- a/Documentation/thermal/sysfs-api.txt
> > > +++ b/Documentation/thermal/sysfs-api.rst
> > > @@ -1,3 +1,4 @@
> > > +===================================
> > > Generic Thermal Sysfs driver How To
> > > ===================================
> > >
> > > @@ -9,6 +10,7 @@ Copyright (c) 2008 Intel Corporation
> > >
> > >
> > > 0. Introduction
> > > +===============
> > >
> > > The generic thermal sysfs provides a set of interfaces for
> > > thermal
> > > zone
> > > devices (sensors) and thermal cooling devices (fan,
> > > processor...) to
> > > register
> > > @@ -25,59 +27,90 @@ An intelligent thermal management application
> > > can
> > > make decisions based on
> > > inputs from thermal zone attributes (the current temperature and
> > > trip point
> > > temperature) and throttle appropriate devices.
> > >
> > > -[0-*] denotes any positive number starting from 0
> > > -[1-*] denotes any positive number starting from 1
> > > +- `[0-*]` denotes any positive number starting from 0
> > > +- `[1-*]` denotes any positive number starting from 1
> > >
> > > 1. thermal sysfs driver interface functions
> > > +===========================================
> > >
> > > 1.1 thermal zone device interface
> > > -1.1.1 struct thermal_zone_device
> > > *thermal_zone_device_register(char
> > > *type,
> > > - int trips, int mask, void *devdata,
> > > - struct thermal_zone_device_ops *ops,
> > > - const struct thermal_zone_params *tzp,
> > > - int passive_delay, int polling_delay))
> > > +---------------------------------
> > > +
> > > + ::
> > > +
> > > + struct thermal_zone_device
> > > + *thermal_zone_device_register(char *type,
> > > + int trips, int mask, void
> > > *devdata,
> > > + struct
> > > thermal_zone_device_ops
> > > *ops,
> > > + const struct
> > > thermal_zone_params *tzp,
> > > + int passive_delay, int
> > > polling_delay))
> > >
> > > This interface function adds a new thermal zone device
> > > (sensor)
> > > to
> > > - /sys/class/thermal folder as thermal_zone[0-*]. It tries to
> > > bind
> > > all the
> > > + /sys/class/thermal folder as `thermal_zone[0-*]`. It tries
> > > to
> > > bind all the
> > > thermal cooling devices registered at the same time.
> > >
> > > - type: the thermal zone type.
> > > - trips: the total number of trip points this thermal zone
> > > supports.
> > > - mask: Bit string: If 'n'th bit is set, then trip point 'n'
> > > is
> > > writeable.
> > > - devdata: device private data
> > > - ops: thermal zone device call-backs.
> > > - .bind: bind the thermal zone device with a thermal
> > > cooling
> > > device.
> > > - .unbind: unbind the thermal zone device with a thermal
> > > cooling device.
> > > - .get_temp: get the current temperature of the thermal
> > > zone.
> > > - .set_trips: set the trip points window. Whenever the
> > > current
> > > temperature
> > > + type:
> > > + the thermal zone type.
> > > + trips:
> > > + the total number of trip points this thermal zone
> > > supports.
> > > + mask:
> > > + Bit string: If 'n'th bit is set, then trip point 'n' is
> > > writeable.
> > > + devdata:
> > > + device private data
> > > + ops:
> > > + thermal zone device call-backs.
> > > +
> > > + .bind:
> > > + bind the thermal zone device with a thermal
> > > cooling
> > > device.
> > > + .unbind:
> > > + unbind the thermal zone device with a thermal
> > > cooling device.
> > > + .get_temp:
> > > + get the current temperature of the thermal zone.
> > > + .set_trips:
> > > + set the trip points window. Whenever the
> > > current
> > > temperature
> > > is updated, the trip points immediately
> > > below
> > > and above the
> > > current temperature are found.
> > > - .get_mode: get the current mode (enabled/disabled) of
> > > the
> > > thermal zone.
> > > - - "enabled" means the kernel thermal management is
> > > enabled.
> > > - - "disabled" will prevent kernel thermal driver
> > > action
> > > upon trip points
> > > - so that user applications can take charge of
> > > thermal
> > > management.
> > > - .set_mode: set the mode (enabled/disabled) of the
> > > thermal
> > > zone.
> > > - .get_trip_type: get the type of certain trip point.
> > > - .get_trip_temp: get the temperature above which the
> > > certain
> > > trip point
> > > + .get_mode:
> > > + get the current mode (enabled/disabled) of
> > > the
> > > thermal zone.
> > > +
> > > + - "enabled" means the kernel thermal
> > > management is
> > > + enabled.
> > > + - "disabled" will prevent kernel thermal
> > > driver action
> > > + upon trip points so that user
> > > applications
> > > can take
> > > + charge of thermal management.
> > > + .set_mode:
> > > + set the mode (enabled/disabled) of the thermal
> > > zone.
> > > + .get_trip_type:
> > > + get the type of certain trip point.
> > > + .get_trip_temp:
> > > + get the temperature above which the
> > > certain
> > > trip point
> > > will be fired.
> > > - .set_emul_temp: set the emulation temperature which
> > > helps in
> > > debugging
> > > + .set_emul_temp:
> > > + set the emulation temperature which
> > > helps in
> > > debugging
> > > different threshold temperature points.
> > > - tzp: thermal zone platform parameters.
> > > - passive_delay: number of milliseconds to wait between polls
> > > when
> > > + tzp:
> > > + thermal zone platform parameters.
> > > + passive_delay:
> > > + number of milliseconds to wait between polls when
> > > performing passive cooling.
> > > - polling_delay: number of milliseconds to wait between polls
> > > when
> > > checking
> > > + polling_delay:
> > > + number of milliseconds to wait between polls when
> > > checking
> > > whether trip points have been crossed (0 for interrupt
> > > driven systems).
> > >
> > > + ::
> > >
> > > -1.1.2 void thermal_zone_device_unregister(struct
> > > thermal_zone_device
> > > *tz)
> > > + void thermal_zone_device_unregister(struct
> > > thermal_zone_device *tz)
> > >
> > > This interface function removes the thermal zone device.
> > > It deletes the corresponding entry from /sys/class/thermal
> > > folder and
> > > unbinds all the thermal cooling devices it uses.
> > >
> > > -1.1.3 struct thermal_zone_device
> > > *thermal_zone_of_sensor_register(
> > > - struct device *dev, int sensor_id, void *data,
> > > - const struct thermal_zone_of_device_ops *ops)
> > > + ::
> > > +
> > > + struct thermal_zone_device
> > > + *thermal_zone_of_sensor_register(struct device *dev,
> > > int
> > > sensor_id,
> > > + void *data,
> > > + const struct
> > > thermal_zone_of_device_ops *ops)
> > >
> > > This interface adds a new sensor to a DT thermal zone.
> > > This function will search the list of thermal zones
> > > described in
> > > @@ -87,25 +120,33 @@ temperature) and throttle appropriate
> > > devices.
> > > thermal zone device.
> > >
> > > The parameters for this interface are:
> > > - dev: Device node of sensor containing
> > > valid
> > > node pointer in
> > > +
> > > + dev:
> > > + Device node of sensor containing valid
> > > node
> > > pointer in
> > > dev->of_node.
> > > - sensor_id: a sensor identifier, in case the
> > > sensor IP
> > > has more
> > > + sensor_id:
> > > + a sensor identifier, in case the sensor
> > > IP
> > > has more
> > > than one sensors
> > > - data: a private pointer (owned by the
> > > caller)
> > > that will be
> > > + data:
> > > + a private pointer (owned by the caller)
> > > that
> > > will be
> > > passed back, when a temperature reading
> > > is
> > > needed.
> > > - ops: struct thermal_zone_of_device_ops *.
> > > + ops:
> > > + `struct thermal_zone_of_device_ops *`.
> > >
> > > - get_temp: a pointer to a function
> > > that reads the
> > > + ============== ========================
> > > ====
> > > ===========
> > > + get_temp a pointer to a function
> > > that
> > > reads the
> > > sensor temperature. This
> > > is
> > > mandatory
> > > callback provided by
> > > sensor
> > > driver.
> > > - set_trips: a pointer to a function
> > > that
> > > sets a
> > > + set_trips a pointer to a function
> > > that sets a
> > > temperature window. When
> > > this window is
> > > left the driver must
> > > inform
> > > the thermal
> > > core via
> > > thermal_zone_device_update.
> > > - get_trend: a pointer to a
> > > function
> > > that reads the
> > > + get_trend a pointer to a
> > > function
> > > that reads the
> > > sensor temperature
> > > trend.
> > > - set_emul_temp: a pointer to a
> > > function that sets
> > > + set_emul_temp a pointer to a
> > > function
> > > that sets
> > > sensor emulated
> > > temperature.
> > > + ============== ========================
> > > ====
> > > ===========
> > > +
> > > The thermal zone temperature is provided by the
> > > get_temp()
> > > function
> > > pointer of thermal_zone_of_device_ops. When called, it
> > > will
> > > have the private pointer @data back.
> > > @@ -114,8 +155,10 @@ temperature) and throttle appropriate
> > > devices.
> > > handle. Caller should check the return handle with
> > > IS_ERR()
> > > for finding
> > > whether success or not.
> > >
> > > -1.1.4 void thermal_zone_of_sensor_unregister(struct device *dev,
> > > - struct thermal_zone_device *tzd)
> > > + ::
> > > +
> > > + void thermal_zone_of_sensor_unregister(struct device
> > > *dev,
> > > + struct
> > > thermal_zone_device *tzd)
> > >
> > > This interface unregisters a sensor from a DT thermal
> > > zone
> > > which was
> > > successfully added by interface
> > > thermal_zone_of_sensor_register().
> > > @@ -124,21 +167,29 @@ temperature) and throttle appropriate
> > > devices.
> > > interface. It will also silent the zone by remove the
> > > .get_temp() and
> > > get_trend() thermal zone device callbacks.
> > >
> > > -1.1.5 struct thermal_zone_device
> > > *devm_thermal_zone_of_sensor_register(
> > > - struct device *dev, int sensor_id,
> > > - void *data, const struct
> > > thermal_zone_of_device_ops
> > > *ops)
> > > + ::
> > > +
> > > + struct thermal_zone_device
> > > + *devm_thermal_zone_of_sensor_register(struct device
> > > *dev,
> > > + int sensor_id,
> > > + void *data,
> > > + const struct
> > > thermal_zone_of_device_ops *ops)
> > >
> > > This interface is resource managed version of
> > > thermal_zone_of_sensor_register().
> > > +
> > > All details of thermal_zone_of_sensor_register()
> > > described
> > > in
> > > section 1.1.3 is applicable here.
> > > +
> > > The benefit of using this interface to register sensor
> > > is
> > > that it
> > > is not require to explicitly call
> > > thermal_zone_of_sensor_unregister()
> > > in error path or during driver unbinding as this is done
> > > by
> > > driver
> > > resource manager.
> > >
> > > -1.1.6 void devm_thermal_zone_of_sensor_unregister(struct device
> > > *dev,
> > > - struct thermal_zone_device *tzd)
> > > + ::
> > > +
> > > + void
> > > devm_thermal_zone_of_sensor_unregister(struct
> > > device *dev,
> > > + struct
> > > thermal_zone_device *tzd)
> > >
> > > This interface is resource managed version of
> > > thermal_zone_of_sensor_unregister().
> > > @@ -147,123 +198,186 @@ temperature) and throttle appropriate
> > > devices.
> > > Normally this function will not need to be called and
> > > the
> > > resource
> > > management code will ensure that the resource is freed.
> > >
> > > -1.1.7 int thermal_zone_get_slope(struct thermal_zone_device *tz)
> > > + ::
> > > +
> > > + int thermal_zone_get_slope(struct
> > > thermal_zone_device *tz)
> > >
> > > This interface is used to read the slope attribute value
> > > for the thermal zone device, which might be useful for
> > > platform
> > > drivers for temperature calculations.
> > >
> > > -1.1.8 int thermal_zone_get_offset(struct thermal_zone_device
> > > *tz)
> > > + ::
> > > +
> > > + int thermal_zone_get_offset(struct
> > > thermal_zone_device *tz)
> > >
> > > This interface is used to read the offset attribute
> > > value
> > > for the thermal zone device, which might be useful for
> > > platform
> > > drivers for temperature calculations.
> > >
> > > 1.2 thermal cooling device interface
> > > -1.2.1 struct thermal_cooling_device
> > > *thermal_cooling_device_register(char *name,
> > > - void *devdata, struct thermal_cooling_device_ops
> > > *)
> > > +------------------------------------
> > > +
> > > +
> > > + ::
> > > +
> > > + struct thermal_cooling_device
> > > + *thermal_cooling_device_register(char *name,
> > > + void *devdata, struct
> > > thermal_cooling_device_ops *)
> > >
> > > This interface function adds a new thermal cooling device
> > > (fan/processor/...)
> > > - to /sys/class/thermal/ folder as cooling_device[0-*]. It
> > > tries
> > > to bind itself
> > > + to /sys/class/thermal/ folder as `cooling_device[0-*]`. It
> > > tries
> > > to bind itself
> > > to all the thermal zone devices registered at the same time.
> > > - name: the cooling device name.
> > > - devdata: device private data.
> > > - ops: thermal cooling devices call-backs.
> > > - .get_max_state: get the Maximum throttle state of the
> > > cooling device.
> > > - .get_cur_state: get the Currently requested throttle
> > > state
> > > of the cooling device.
> > > - .set_cur_state: set the Current throttle state of the
> > > cooling device.
> > > -
> > > -1.2.2 void thermal_cooling_device_unregister(struct
> > > thermal_cooling_device *cdev)
> > > +
> > > + name:
> > > + the cooling device name.
> > > + devdata:
> > > + device private data.
> > > + ops:
> > > + thermal cooling devices call-backs.
> > > +
> > > + .get_max_state:
> > > + get the Maximum throttle state of the cooling
> > > device.
> > > + .get_cur_state:
> > > + get the Currently requested throttle state of
> > > the
> > > + cooling device.
> > > + .set_cur_state:
> > > + set the Current throttle state of the cooling
> > > device.
> > > +
> > > + ::
> > > +
> > > + void thermal_cooling_device_unregister(struct
> > > thermal_cooling_device *cdev)
> > >
> > > This interface function removes the thermal cooling device.
> > > It deletes the corresponding entry from /sys/class/thermal
> > > folder and
> > > unbinds itself from all the thermal zone devices using it.
> > >
> > > 1.3 interface for binding a thermal zone device with a thermal
> > > cooling device
> > > -1.3.1 int thermal_zone_bind_cooling_device(struct
> > > thermal_zone_device *tz,
> > > - int trip, struct thermal_cooling_device *cdev,
> > > - unsigned long upper, unsigned long lower, unsigned int
> > > weight);
> > > +--------------------------------------------------------------
> > > ----
> > > -----------
> > > +
> > > + ::
> > > +
> > > + int thermal_zone_bind_cooling_device(struct
> > > thermal_zone_device *tz,
> > > + int trip, struct thermal_cooling_device *cdev,
> > > + unsigned long upper, unsigned long lower,
> > > unsigned
> > > int weight);
> > >
> > > This interface function binds a thermal cooling device to a
> > > particular trip
> > > point of a thermal zone device.
> > > +
> > > This function is usually called in the thermal zone device
> > > .bind
> > > callback.
> > > - tz: the thermal zone device
> > > - cdev: thermal cooling device
> > > - trip: indicates which trip point in this thermal zone the
> > > cooling device
> > > - is associated with.
> > > - upper:the Maximum cooling state for this trip point.
> > > - THERMAL_NO_LIMIT means no upper limit,
> > > +
> > > + tz:
> > > + the thermal zone device
> > > + cdev:
> > > + thermal cooling device
> > > + trip:
> > > + indicates which trip point in this thermal zone the
> > > cooling device
> > > + is associated with.
> > > + upper:
> > > + the Maximum cooling state for this trip point.
> > > + THERMAL_NO_LIMIT means no upper limit,
> > > and the cooling device can be in max_state.
> > > - lower:the Minimum cooling state can be used for this trip
> > > point.
> > > - THERMAL_NO_LIMIT means no lower limit,
> > > + lower:
> > > + the Minimum cooling state can be used for this trip
> > > point.
> > > + THERMAL_NO_LIMIT means no lower limit,
> > > and the cooling device can be in cooling state 0.
> > > - weight: the influence of this cooling device in this thermal
> > > - zone. See 1.4.1 below for more information.
> > > + weight:
> > > + the influence of this cooling device in this thermal
> > > + zone. See 1.4.1 below for more information.
> > >
> > > -1.3.2 int thermal_zone_unbind_cooling_device(struct
> > > thermal_zone_device *tz,
> > > - int trip, struct thermal_cooling_device *cdev);
> > > + ::
> > > +
> > > + int thermal_zone_unbind_cooling_device(struct
> > > thermal_zone_device *tz,
> > > + int trip, struct
> > > thermal_cooling_device *cdev);
> > >
> > > This interface function unbinds a thermal cooling device
> > > from a
> > > particular
> > > trip point of a thermal zone device. This function is
> > > usually
> > > called in
> > > the thermal zone device .unbind callback.
> > > - tz: the thermal zone device
> > > - cdev: thermal cooling device
> > > - trip: indicates which trip point in this thermal zone the
> > > cooling device
> > > - is associated with.
> > > +
> > > + tz:
> > > + the thermal zone device
> > > + cdev:
> > > + thermal cooling device
> > > + trip:
> > > + indicates which trip point in this thermal zone the
> > > cooling
> > > device
> > > + is associated with.
> > >
> > > 1.4 Thermal Zone Parameters
> > > -1.4.1 struct thermal_bind_params
> > > +---------------------------
> > > +
> > > + ::
> > > +
> > > + struct thermal_bind_params
> > > +
> > > This structure defines the following parameters that are
> > > used to
> > > bind
> > > a zone with a cooling device for a particular trip point.
> > > - .cdev: The cooling device pointer
> > > - .weight: The 'influence' of a particular cooling device on
> > > this
> > > - zone. This is relative to the rest of the cooling
> > > - devices. For example, if all cooling devices have a
> > > - weight of 1, then they all contribute the same. You
> > > can
> > > - use percentages if you want, but it's not
> > > mandatory. A
> > > - weight of 0 means that this cooling device doesn't
> > > - contribute to the cooling of this zone unless all
> > > cooling
> > > - devices have a weight of 0. If all weights are 0,
> > > then
> > > - they all contribute the same.
> > > - .trip_mask:This is a bit mask that gives the binding
> > > relation
> > > between
> > > - this thermal zone and cdev, for a particular trip
> > > point.
> > > - If nth bit is set, then the cdev and thermal zone
> > > are
> > > bound
> > > - for trip point n.
> > > - .binding_limits: This is an array of cooling state limits.
> > > Must
> > > have
> > > - exactly 2 *
> > > thermal_zone.number_of_trip_points.
> > > It is an
> > > - array consisting of tuples <lower-state
> > > upper-
> > > state> of
> > > - state limits. Each trip will be associated
> > > with
> > > one state
> > > - limit tuple when binding. A NULL pointer
> > > means
> > > - <THERMAL_NO_LIMITS THERMAL_NO_LIMITS> on
> > > all
> > > trips.
> > > - These limits are used when binding a cdev
> > > to a
> > > trip point.
> > > - .match: This call back returns success(0) if the 'tz and
> > > cdev'
> > > need to
> > > +
> > > + .cdev:
> > > + The cooling device pointer
> > > + .weight:
> > > + The 'influence' of a particular cooling device on
> > > this
> > > + zone. This is relative to the rest of the cooling
> > > + devices. For example, if all cooling devices have a
> > > + weight of 1, then they all contribute the same. You
> > > can
> > > + use percentages if you want, but it's not
> > > mandatory. A
> > > + weight of 0 means that this cooling device doesn't
> > > + contribute to the cooling of this zone unless all
> > > cooling
> > > + devices have a weight of 0. If all weights are 0,
> > > then
> > > + they all contribute the same.
> > > + .trip_mask:
> > > + This is a bit mask that gives the binding
> > > relation
> > > between
> > > + this thermal zone and cdev, for a particular trip
> > > point.
> > > + If nth bit is set, then the cdev and thermal zone
> > > are
> > > bound
> > > + for trip point n.
> > > + .binding_limits:
> > > + This is an array of cooling state limits.
> > > Must
> > > have
> > > + exactly 2 *
> > > thermal_zone.number_of_trip_points.
> > > It is an
> > > + array consisting of tuples <lower-state
> > > upper-
> > > state> of
> > > + state limits. Each trip will be associated
> > > with
> > > one state
> > > + limit tuple when binding. A NULL pointer
> > > means
> > > + <THERMAL_NO_LIMITS THERMAL_NO_LIMITS> on
> > > all
> > > trips.
> > > + These limits are used when binding a cdev
> > > to a
> > > trip point.
> > > + .match:
> > > + This call back returns success(0) if the 'tz and
> > > cdev'
> > > need to
> > > be bound, as per platform data.
> > > -1.4.2 struct thermal_zone_params
> > > +
> > > + ::
> > > +
> > > + struct thermal_zone_params
> > > +
> > > This structure defines the platform level parameters for a
> > > thermal zone.
> > > This data, for each thermal zone should come from the
> > > platform
> > > layer.
> > > This is an optional feature where some platforms can choose
> > > not
> > > to
> > > provide this data.
> > > - .governor_name: Name of the thermal governor used for this
> > > zone
> > > - .no_hwmon: a boolean to indicate if the thermal to hwmon
> > > sysfs
> > > interface
> > > - is required. when no_hwmon == false, a hwmon
> > > sysfs
> > > interface
> > > - will be created. when no_hwmon == true, nothing
> > > will
> > > be done.
> > > - In case the thermal_zone_params is NULL, the
> > > hwmon
> > > interface
> > > - will be created (for backward compatibility).
> > > - .num_tbps: Number of thermal_bind_params entries for this
> > > zone
> > > - .tbp: thermal_bind_params entries
> > > +
> > > + .governor_name:
> > > + Name of the thermal governor used for this zone
> > > + .no_hwmon:
> > > + a boolean to indicate if the thermal to hwmon
> > > sysfs
> > > interface
> > > + is required. when no_hwmon == false, a hwmon
> > > sysfs
> > > interface
> > > + will be created. when no_hwmon == true, nothing
> > > will
> > > be done.
> > > + In case the thermal_zone_params is NULL, the
> > > hwmon
> > > interface
> > > + will be created (for backward compatibility).
> > > + .num_tbps:
> > > + Number of thermal_bind_params entries for this
> > > zone
> > > + .tbp:
> > > + thermal_bind_params entries
> > >
> > > 2. sysfs attributes structure
> > > +=============================
> > >
> > > +== ================
> > > RO read only value
> > > WO write only value
> > > RW read/write value
> > > +== ================
> > >
> > > Thermal sysfs attributes will be represented under
> > > /sys/class/thermal.
> > > Hwmon sysfs I/F extension is also available under
> > > /sys/class/hwmon
> > > if hwmon is compiled in or built as a module.
> > >
> > > -Thermal zone device sys I/F, created once it's registered:
> > > -/sys/class/thermal/thermal_zone[0-*]:
> > > +Thermal zone device sys I/F, created once it's registered::
> > > +
> > > + /sys/class/thermal/thermal_zone[0-*]:
> > > |---type: Type of the thermal zone
> > > |---temp: Current temperature
> > > |---mode: Working mode of the thermal
> > > zone
> > > @@ -282,8 +396,9 @@ Thermal zone device sys I/F, created once
> > > it's
> > > registered:
> > > |---slope: Slope constant applied as linear
> > > extrapolation
> > > |---offset: Offset constant applied as
> > > linear
> > > extrapolation
> > >
> > > -Thermal cooling device sys I/F, created once it's registered:
> > > -/sys/class/thermal/cooling_device[0-*]:
> > > +Thermal cooling device sys I/F, created once it's registered::
> > > +
> > > + /sys/class/thermal/cooling_device[0-*]:
> > > |---type: Type of the cooling
> > > device(processor/fan/...)
> > > |---max_state: Maximum cooling state of the
> > > cooling device
> > > |---cur_state: Current cooling state of the
> > > cooling device
> > > @@ -299,11 +414,13 @@ the relationship between a thermal zone and
> > > its
> > > associated cooling device.
> > > They are created/removed for each successful execution of
> > > thermal_zone_bind_cooling_device/thermal_zone_unbind_cooling_dev
> > > ice.
> > >
> > > -/sys/class/thermal/thermal_zone[0-*]:
> > > +::
> > > +
> > > + /sys/class/thermal/thermal_zone[0-*]:
> > > |---cdev[0-*]: [0-*]th cooling device in
> > > current
> > > thermal zone
> > > |---cdev[0-*]_trip_point: Trip point that cdev[0-*]
> > > is
> > > associated with
> > > |---cdev[0-*]_weight: Influence of the cooling device
> > > in
> > > - this thermal zone
> > > + this thermal zone
> > >
> > > Besides the thermal zone device sysfs I/F and cooling device
> > > sysfs
> > > I/F,
> > > the generic thermal driver also creates a hwmon sysfs I/F for
> > > each
> > > _type_
> > > @@ -311,16 +428,17 @@ of thermal zone device. E.g. the generic
> > > thermal driver registers one hwmon
> > > class device and build the associated hwmon sysfs I/F for all
> > > the
> > > registered
> > > ACPI thermal zones.
> > >
> > > -/sys/class/hwmon/hwmon[0-*]:
> > > +::
> > > +
> > > + /sys/class/hwmon/hwmon[0-*]:
> > > |---name: The type of the thermal
> > > zone
> > > devices
> > > |---temp[1-*]_input: The current temperature of
> > > thermal
> > > zone [1-*]
> > > |---temp[1-*]_critical: The critical trip point of
> > > thermal zone [1-*]
> > >
> > > Please read Documentation/hwmon/sysfs-interface.rst for
> > > additional
> > > information.
> > >
> > > -***************************
> > > -* Thermal zone attributes *
> > > -***************************
> > > +Thermal zone attributes
> > > +-----------------------
> > >
> > > type
> > > Strings which represent the thermal zone type.
> > > @@ -340,54 +458,67 @@ mode
> > > This file gives information about the algorithm that is
> > > currently
> > > managing the thermal zone. It can be either default
> > > kernel
> > > based
> > > algorithm or user space application.
> > > - enabled = enable Kernel Thermal
> > > management.
> > > - disabled = Preventing kernel thermal zone driver
> > > actions upon
> > > +
> > > + enabled
> > > + enable Kernel Thermal management.
> > > + disabled
> > > + Preventing kernel thermal zone driver
> > > actions upon
> > > trip points so that user application
> > > can
> > > take full
> > > charge of the thermal management.
> > > +
> > > RW, Optional
> > >
> > > policy
> > > One of the various thermal governors used for a
> > > particular
> > > zone.
> > > +
> > > RW, Required
> > >
> > > available_policies
> > > Available thermal governors which can be used for a
> > > particular zone.
> > > +
> > > RO, Required
> > >
> > > -trip_point_[0-*]_temp
> > > +`trip_point_[0-*]_temp`
> > > The temperature above which trip point will be fired.
> > > +
> > > Unit: millidegree Celsius
> > > +
> > > RO, Optional
> > >
> > > -trip_point_[0-*]_type
> > > +`trip_point_[0-*]_type`
> > > Strings which indicate the type of the trip point.
> > > - E.g. it can be one of critical, hot, passive, active[0-
> > > *]
> > > for ACPI
> > > +
> > > + E.g. it can be one of critical, hot, passive, `active[0-
> > > *]`
> > > for ACPI
> > > thermal zone.
> > > +
> > > RO, Optional
> > >
> > > -trip_point_[0-*]_hyst
> > > +`trip_point_[0-*]_hyst`
> > > The hysteresis value for a trip point, represented as an
> > > integer
> > > Unit: Celsius
> > > RW, Optional
> > >
> > > -cdev[0-*]
> > > +`cdev[0-*]`
> > > Sysfs link to the thermal cooling device node where the
> > > sys
> > > I/F
> > > for cooling device throttling control represents.
> > > +
> > > RO, Optional
> > >
> > > -cdev[0-*]_trip_point
> > > - The trip point in this thermal zone which cdev[0-*] is
> > > associated
> > > +`cdev[0-*]_trip_point`
> > > + The trip point in this thermal zone which `cdev[0-*]` is
> > > associated
> > > with; -1 means the cooling device is not associated with
> > > any
> > > trip
> > > point.
> > > +
> > > RO, Optional
> > >
> > > -cdev[0-*]_weight
> > > - The influence of cdev[0-*] in this thermal zone. This
> > > value
> > > - is relative to the rest of cooling devices in the
> > > thermal
> > > - zone. For example, if a cooling device has a weight
> > > double
> > > - than that of other, it's twice as effective in cooling
> > > the
> > > - thermal zone.
> > > - RW, Optional
> > > +`cdev[0-*]_weight`
> > > + The influence of `cdev[0-*]` in this thermal zone. This
> > > value
> > > + is relative to the rest of cooling devices in the
> > > thermal
> > > + zone. For example, if a cooling device has a weight
> > > double
> > > + than that of other, it's twice as effective in cooling
> > > the
> > > + thermal zone.
> > > +
> > > + RW, Optional
> > >
> > > passive
> > > Attribute is only present for zones in which the passive
> > > cooling
> > > @@ -395,8 +526,11 @@ passive
> > > and can be set to a temperature (in millidegrees) to
> > > enable
> > > a
> > > passive trip point for the zone. Activation is done by
> > > polling with
> > > an interval of 1 second.
> > > +
> > > Unit: millidegrees Celsius
> > > +
> > > Valid values: 0 (disabled) or greater than 1000
> > > +
> > > RW, Optional
> > >
> > > emul_temp
> > > @@ -407,17 +541,21 @@ emul_temp
> > > threshold and its associated cooling action. This is
> > > write
> > > only node
> > > and writing 0 on this node should disable emulation.
> > > Unit: millidegree Celsius
> > > +
> > > WO, Optional
> > >
> > > - WARNING: Be careful while enabling this option on
> > > production systems,
> > > - because userland can easily disable the thermal policy
> > > by
> > > simply
> > > - flooding this sysfs node with low temperature values.
> > > + WARNING:
> > > + Be careful while enabling this option on production
> > > systems,
> > > + 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
> > > + more information see
> > > Documentation/thermal/power_allocator.rst
> > > +
> > > Unit: milliwatts
> > > +
> > > RW, Optional
> > >
> > > k_po
> > > @@ -425,7 +563,8 @@ k_po
> > > 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
> > > + Documentation/thermal/power_allocator.rst
> > > +
> > > RW, Optional
> > >
> > > k_pu
> > > @@ -433,20 +572,23 @@ k_pu
> > > 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
> > > + Documentation/thermal/power_allocator.rst
> > > +
> > > 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
> > > + Documentation/thermal/power_allocator.rst
> > > +
> > > RW, Optional
> > >
> > > k_d
> > > The derivative term of the power allocator governor's
> > > PID
> > > controller. For more information see
> > > - Documentation/thermal/power_allocator.txt
> > > + Documentation/thermal/power_allocator.rst
> > > +
> > > RW, Optional
> > >
> > > integral_cutoff
> > > @@ -456,8 +598,10 @@ integral_cutoff
> > > 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
> > > + Documentation/thermal/power_allocator.rst
> > > +
> > > Unit: millidegree Celsius
> > > +
> > > RW, Optional
> > >
> > > slope
> > > @@ -465,6 +609,7 @@ slope
> > > to determine a hotspot temperature based off the
> > > sensor's
> > > raw readings. It is up to the device driver to determine
> > > the usage of these values.
> > > +
> > > RW, Optional
> > >
> > > offset
> > > @@ -472,28 +617,33 @@ offset
> > > to determine a hotspot temperature based off the
> > > sensor's
> > > raw readings. It is up to the device driver to determine
> > > the usage of these values.
> > > +
> > > RW, Optional
> > >
> > > -*****************************
> > > -* Cooling device attributes *
> > > -*****************************
> > > +Cooling device attributes
> > > +-------------------------
> > >
> > > type
> > > String which represents the type of device, e.g:
> > > +
> > > - for generic ACPI: should be "Fan", "Processor" or
> > > "LCD"
> > > - for memory controller device on intel_menlow platform:
> > > should be "Memory controller".
> > > +
> > > RO, Required
> > >
> > > max_state
> > > The maximum permissible cooling state of this cooling
> > > device.
> > > +
> > > RO, Required
> > >
> > > cur_state
> > > The current cooling state of this cooling device.
> > > The value can any integer numbers between 0 and
> > > max_state:
> > > +
> > > - cur_state == 0 means no cooling
> > > - cur_state == max_state means the maximum cooling.
> > > +
> > > RW, Required
> > >
> > > stats/reset
> > > @@ -508,9 +658,11 @@ stats/time_in_state_ms:
> > > units here is 10mS (similar to other time exported in
> > > /proc).
> > > RO, Required
> > >
> > > +
> > > stats/total_trans:
> > > A single positive value showing the total number of
> > > times
> > > the state of a
> > > cooling device is changed.
> > > +
> > > RO, Required
> > >
> > > stats/trans_table:
> > > @@ -522,6 +674,7 @@ stats/trans_table:
> > > RO, Required
> > >
> > > 3. A simple implementation
> > > +==========================
> > >
> > > ACPI thermal zone may support multiple trip points like
> > > critical,
> > > hot,
> > > passive, active. If an ACPI thermal zone supports critical,
> > > passive,
> > > @@ -532,11 +685,10 @@ thermal_cooling_device. Both are considered
> > > to
> > > have the same
> > > effectiveness in cooling the thermal zone.
> > >
> > > If the processor is listed in _PSL method, and the fan is listed
> > > in
> > > _AL0
> > > -method, the sys I/F structure will be built like this:
> > > +method, the sys I/F structure will be built like this::
> > >
> > > -/sys/class/thermal:
> > > -
> > > -|thermal_zone1:
> > > + /sys/class/thermal:
> > > + |thermal_zone1:
> > > |---type: acpitz
> > > |---temp: 37000
> > > |---mode: enabled
> > > @@ -557,24 +709,24 @@ method, the sys I/F structure will be built
> > > like this:
> > > |---cdev1_trip_point: 2 /* cdev1 can be used
> > > for
> > > active[0]*/
> > > |---cdev1_weight: 1024
> > >
> > > -|cooling_device0:
> > > + |cooling_device0:
> > > |---type: Processor
> > > |---max_state: 8
> > > |---cur_state: 0
> > >
> > > -|cooling_device3:
> > > + |cooling_device3:
> > > |---type: Fan
> > > |---max_state: 2
> > > |---cur_state: 0
> > >
> > > -/sys/class/hwmon:
> > > -
> > > -|hwmon0:
> > > + /sys/class/hwmon:
> > > + |hwmon0:
> > > |---name: acpitz
> > > |---temp1_input: 37000
> > > |---temp1_crit: 100000
> > >
> > > 4. Event Notification
> > > +=====================
> > >
> > > The framework includes a simple notification mechanism, in the
> > > form
> > > of a
> > > netlink event. Netlink socket initialization is done during the
> > > _init_
> > > @@ -587,21 +739,28 @@ event will be one of:{THERMAL_AUX0,
> > > THERMAL_AUX1, THERMAL_CRITICAL,
> > > THERMAL_DEV_FAULT}. Notification can be sent when the current
> > > temperature
> > > crosses any of the configured thresholds.
> > >
> > > -5. Export Symbol APIs:
> > > +5. Export Symbol APIs
> > > +=====================
> > > +
> > > +5.1. get_tz_trend
> > > +-----------------
> > >
> > > -5.1: get_tz_trend:
> > > This function returns the trend of a thermal zone, i.e the rate
> > > of
> > > change
> > > of temperature of the thermal zone. Ideally, the thermal sensor
> > > drivers
> > > are supposed to implement the callback. If they don't, the
> > > thermal
> > > framework calculated the trend by comparing the previous and the
> > > current
> > > temperature values.
> > >
> > > -5.2:get_thermal_instance:
> > > +5.2. get_thermal_instance
> > > +-------------------------
> > > +
> > > This function returns the thermal_instance corresponding to a
> > > given
> > > {thermal_zone, cooling_device, trip_point} combination. Returns
> > > NULL
> > > if such an instance does not exist.
> > >
> > > -5.3:thermal_notify_framework:
> > > +5.3. thermal_notify_framework
> > > +-----------------------------
> > > +
> > > This function handles the trip events from sensor drivers. It
> > > starts
> > > throttling the cooling devices according to the policy
> > > configured.
> > > For CRITICAL and HOT trip points, this notifies the respective
> > > drivers,
> > > @@ -609,12 +768,15 @@ and does actual throttling for other trip
> > > points i.e ACTIVE and PASSIVE.
> > > The throttling policy is based on the configured platform data;
> > > if
> > > no
> > > platform data is provided, this uses the step_wise throttling
> > > policy.
> > >
> > > -5.4:thermal_cdev_update:
> > > +5.4. thermal_cdev_update
> > > +------------------------
> > > +
> > > This function serves as an arbitrator to set the state of a
> > > cooling
> > > device. It sets the cooling device to the deepest cooling state
> > > if
> > > possible.
> > >
> > > -6. thermal_emergency_poweroff:
> > > +6. thermal_emergency_poweroff
> > > +=============================
> > >
> > > On an event of critical trip temperature crossing. Thermal
> > > framework
> > > allows the system to shutdown gracefully by calling
> > > orderly_poweroff().
> > > diff --git a/Documentation/thermal/x86_pkg_temperature_thermal
> > > b/Documentation/thermal/x86_pkg_temperature_thermal.rst
> > > similarity index 80%
> > > rename from Documentation/thermal/x86_pkg_temperature_thermal
> > > rename to Documentation/thermal/x86_pkg_temperature_thermal.rst
> > > index 17a3a4c0a0ca..f134dbd3f5a9 100644
> > > --- a/Documentation/thermal/x86_pkg_temperature_thermal
> > > +++ b/Documentation/thermal/x86_pkg_temperature_thermal.rst
> > > @@ -1,19 +1,23 @@
> > > +===================================
> > > Kernel driver: x86_pkg_temp_thermal
> > > -===================
> > > +===================================
> > >
> > > Supported chips:
> > > +
> > > * x86: with package level thermal management
> > > +
> > > (Verify using: CPUID.06H:EAX[bit 6] =1)
> > >
> > > Authors: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.co
> > > m>
> > >
> > > Reference
> > > ----
> > > +---------
> > > +
> > > Intel® 64 and IA-32 Architectures Software Developer’s Manual
> > > (Jan,
> > > 2013):
> > > Chapter 14.6: PACKAGE LEVEL THERMAL MANAGEMENT
> > >
> > > Description
> > > ----------
> > > +-----------
> > >
> > > This driver register CPU digital temperature package level
> > > sensor as
> > > a thermal
> > > zone with maximum two user mode configurable trip points. Number
> > > of
> > > trip points
> > > @@ -25,23 +29,27 @@ take any action to control temperature.
> > > Threshold management
> > > --------------------
> > > Each package will register as a thermal zone under
> > > /sys/class/thermal.
> > > -Example:
> > > -/sys/class/thermal/thermal_zone1
> > > +
> > > +Example::
> > > +
> > > + /sys/class/thermal/thermal_zone1
> > >
> > > This contains two trip points:
> > > +
> > > - trip_point_0_temp
> > > - trip_point_1_temp
> > >
> > > User can set any temperature between 0 to TJ-Max temperature.
> > > Temperature units
> > > -are in milli-degree Celsius. Refer to
> > > "Documentation/thermal/sysfs-
> > > api.txt" for
> > > +are in milli-degree Celsius. Refer to
> > > "Documentation/thermal/sysfs-
> > > api.rst" for
> > > thermal sys-fs details.
> > >
> > > Any value other than 0 in these trip points, can trigger thermal
> > > notifications.
> > > Setting 0, stops sending thermal notifications.
> > >
> > > -Thermal notifications: To get kobject-uevent notifications, set
> > > the
> > > thermal zone
> > > -policy to "user_space". For example: echo -n "user_space" >
> > > policy
> > > -
> > > -
> > > +Thermal notifications:
> > > +To get kobject-uevent notifications, set the thermal zone
> > > +policy to "user_space".
> > >
> > > +For example::
> > >
> > > + echo -n "user_space" > policy
> > > diff --git a/MAINTAINERS b/MAINTAINERS
> > > index d9e214f68e52..b2254bc8e495 100644
> > > --- a/MAINTAINERS
> > > +++ b/MAINTAINERS
> > > @@ -15687,7 +15687,7 @@ M: Viresh Kumar <viresh.kumar@...a
> > > ro.o
> > > rg>
> > > M: Javi Merino <javi.merino@...nel.org>
> > > L: linux-pm@...r.kernel.org
> > > S: Supported
> > > -F: Documentation/thermal/cpu-cooling-api.txt
> > > +F: Documentation/thermal/cpu-cooling-api.rst
> > > F: drivers/thermal/cpu_cooling.c
> > > F: include/linux/cpu_cooling.h
> > >
> > > diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> > > index 15a4ca5d7099..681047f8cc05 100644
> > > --- a/include/linux/thermal.h
> > > +++ b/include/linux/thermal.h
> > > @@ -251,7 +251,7 @@ struct thermal_bind_params {
> > > * platform characterization. This value is relative to
> > > the
> > > * rest of the weights so a cooling device whose weight
> > > is
> > > * double that of another cooling device is twice as
> > > - * effective. See Documentation/thermal/sysfs-api.txt
> > > for
> > > more
> > > + * effective. See Documentation/thermal/sysfs-api.rst
> > > for
> > > more
> > > * information.
> > > */
> > > int weight;
> > > @@ -259,7 +259,7 @@ struct thermal_bind_params {
> > > /*
> > > * This is a bit mask that gives the binding relation
> > > between this
> > > * thermal zone and cdev, for a particular trip point.
> > > - * See Documentation/thermal/sysfs-api.txt for more
> > > information.
> > > + * See Documentation/thermal/sysfs-api.rst for more
> > > information.
> > > */
> > > int trip_mask;
> > >
>
>
> Thanks,
> Mauro
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