redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

Power management updates for v4.11-rc1 

- Operating Performance Points (OPP) framework fixes, cleanups and
    switch over from RCU-based synchronization to reference counting
    using krefs (Viresh Kumar, Wei Yongjun, Dave Gerlach).
 
  - cpufreq core cleanups and documentation updates (Viresh Kumar,
    Rafael Wysocki).
 
  - New cpufreq driver for Broadcom BMIPS SoCs (Markus Mayer).
 
  - New cpufreq-dt sub-driver for TI SoCs requiring special handling,
    like in the AM335x, AM437x, DRA7x, and AM57x families, along with
    new DT bindings for it (Dave Gerlach, Paul Gortmaker).
 
  - ARM64 SoCs support for the qoriq cpufreq driver (Tang Yuantian).
 
  - intel_pstate driver updates including a new sysfs knob to control
    the driver's operation mode and fixes related to the no_turbo
    sysfs knob and the hardware-managed P-states feature support
    (Rafael Wysocki, Srinivas Pandruvada).
 
  - New interface to export ultra-turbo frequencies for the powernv
    cpufreq driver (Shilpasri Bhat).
 
  - Assorted fixes for cpufreq drivers (Arnd Bergmann, Dan Carpenter,
    Wei Yongjun).
 
  - devfreq core fixes, mostly related to the sysfs interface exported
    by it (Chanwoo Choi, Chris Diamand).
 
  - Updates of the exynos-bus and exynos-ppmu devfreq drivers (Chanwoo
    Choi).
 
  - Device PM QoS extension to support CPUs and support for per-CPU
    wakeup (device resume) latency constraints in the cpuidle menu
    governor (Alex Shi).
 
  - Wakeup IRQs framework fixes (Grygorii Strashko).
 
  - Generic power domains framework update including a fix to make
    it handle asynchronous invocations of *noirq suspend/resume
    callbacks correctly (Ulf Hansson, Geert Uytterhoeven).
 
  - Assorted fixes and cleanups in the core suspend/hibernate code,
    PM QoS framework and x86 ACPI idle support code (Corentin Labbe,
    Geert Uytterhoeven, Geliang Tang, John Keeping, Nick Desaulniers).
 
  - Update of the analyze_suspend.py script is updated to version 4.5
    offering multiple improvements (Todd Brandt).
 
  - New tool for intel_pstate diagnostics using the pstate_sample
    tracepoint (Doug Smythies).
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2
 
 iQIcBAABCAAGBQJYq3IjAAoJEILEb/54YlRx/lYP+gNXhfETSzjd4kWSHy3FVEDb
 gc5rMiE2j0OYgVSXwBI7p4EqMPy56lSWBASvbF2o6v9CIxb880KLFEsMDCVHwn46
 6xfEnIRxf1oeRqn7EG9ZPIcTgNsUyvK+gah7zgLXu/0KU7ceXxygvNk47qpeOZ8f
 dKYgIk/TOSGPC8H2nsg8VBKlK/ZOj5hID4F3MmFw6yDuWVCYuh2EokYXS4Nx0JwY
 UQGpWtz+FWWs71vhgVl33GbPXWvPqA7OMe0btZ3RCnhnz4tA/mH+jDWiaspCdS3J
 vKGeZyZptjIMJcufm3X7s7ghYjELheqQusMODDXk4AaWQ5nz8V5/h7NThYfa9J1b
 M93Tb0rMb2MqUhBpv/M6D3qQroZmhq55QKfQrul3QWSOiQUzTWJcbbpyeBQ7nkrI
 F1qNqQfuCnBL/r9y7HpW8P2iFg9kCHkwTtXMdp/lzGXdKzSGtAUSkYg5ohnUzQTp
 2WCPTEk+5DxLVPjW5rDoZOotr5p1kdcdWBk6r3MEWRokZK6PJo7rJBcnTtXSo2mO
 lLRba006q+fTlI5wZtjAI0rOiS3JgtT6cRx7uPjZlze9TGjklJhdsCPJbM5gcOT+
 YiOxvqD+9if5QRSxiEZNj3bQ43wYhXmpctfIanyxziq09BPIPxvgfRR/BkUzc34R
 ps4CIvImim5v5xc8Zsbk
 =57xJ
 -----END PGP SIGNATURE-----

Merge tag 'pm-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management updates from Rafael Wysocki:
 "The majority of changes go into the Operating Performance Points (OPP)
  framework and cpufreq this time, followed by devfreq and some
  scattered updates all over.

  The OPP changes are mostly related to switching over from RCU-based
  synchronization, that turned out to be overly complicated and
  problematic, to reference counting using krefs.

  In the cpufreq land there are core cleanups, documentation updates, a
  new driver for Broadcom BMIPS SoCs, a new cpufreq-dt sub-driver for TI
  SoCs that require special handling, ARM64 SoCs support for the qoriq
  driver, intel_pstate updates, powernv driver update and assorted
  fixes.

  The devfreq changes are mostly fixes related to the sysfs interface
  and some Exynos drivers updates.

  Apart from that, the cpuidle menu governor will support per-CPU PM QoS
  constraints for the wakeup latency now, some bugs in the wakeup IRQs
  framework are fixed, the generic power domains framework should handle
  asynchronous invocations of *noirq suspend/resume callbacks from now
  on, the analyze_suspend.py script is updated and there is a new tool
  for intel_pstate diagnostics.

  Specifics:

   - Operating Performance Points (OPP) framework fixes, cleanups and
     switch over from RCU-based synchronization to reference counting
     using krefs (Viresh Kumar, Wei Yongjun, Dave Gerlach)

   - cpufreq core cleanups and documentation updates (Viresh Kumar,
     Rafael Wysocki)

   - New cpufreq driver for Broadcom BMIPS SoCs (Markus Mayer)

   - New cpufreq-dt sub-driver for TI SoCs requiring special handling,
     like in the AM335x, AM437x, DRA7x, and AM57x families, along with
     new DT bindings for it (Dave Gerlach, Paul Gortmaker)

   - ARM64 SoCs support for the qoriq cpufreq driver (Tang Yuantian)

   - intel_pstate driver updates including a new sysfs knob to control
     the driver's operation mode and fixes related to the no_turbo sysfs
     knob and the hardware-managed P-states feature support (Rafael
     Wysocki, Srinivas Pandruvada)

   - New interface to export ultra-turbo frequencies for the powernv
     cpufreq driver (Shilpasri Bhat)

   - Assorted fixes for cpufreq drivers (Arnd Bergmann, Dan Carpenter,
     Wei Yongjun)

   - devfreq core fixes, mostly related to the sysfs interface exported
     by it (Chanwoo Choi, Chris Diamand)

   - Updates of the exynos-bus and exynos-ppmu devfreq drivers (Chanwoo
     Choi)

   - Device PM QoS extension to support CPUs and support for per-CPU
     wakeup (device resume) latency constraints in the cpuidle menu
     governor (Alex Shi)

   - Wakeup IRQs framework fixes (Grygorii Strashko)

   - Generic power domains framework update including a fix to make it
     handle asynchronous invocations of *noirq suspend/resume callbacks
     correctly (Ulf Hansson, Geert Uytterhoeven)

   - Assorted fixes and cleanups in the core suspend/hibernate code, PM
     QoS framework and x86 ACPI idle support code (Corentin Labbe, Geert
     Uytterhoeven, Geliang Tang, John Keeping, Nick Desaulniers)

   - Update of the analyze_suspend.py script is updated to version 4.5
     offering multiple improvements (Todd Brandt)

   - New tool for intel_pstate diagnostics using the pstate_sample
     tracepoint (Doug Smythies)"

* tag 'pm-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (85 commits)
  MAINTAINERS: cpufreq: add bmips-cpufreq.c
  PM / QoS: Fix memory leak on resume_latency.notifiers
  PM / Documentation: Spelling s/wrtie/write/
  PM / sleep: Fix test_suspend after sleep state rework
  cpufreq: CPPC: add ACPI_PROCESSOR dependency
  cpufreq: make ti-cpufreq explicitly non-modular
  cpufreq: Do not clear real_cpus mask on policy init
  tools/power/x86: Debug utility for intel_pstate driver
  AnalyzeSuspend: fix drag and zoom bug in javascript
  PM / wakeirq: report a wakeup_event on dedicated wekup irq
  PM / wakeirq: Fix spurious wake-up events for dedicated wakeirqs
  PM / wakeirq: Enable dedicated wakeirq for suspend
  cpufreq: dt: Don't use generic platdev driver for ti-cpufreq platforms
  cpufreq: ti: Add cpufreq driver to determine available OPPs at runtime
  Documentation: dt: add bindings for ti-cpufreq
  PM / OPP: Expose _of_get_opp_desc_node as dev_pm_opp API
  cpufreq: qoriq: Don't look at clock implementation details
  cpufreq: qoriq: add ARM64 SoCs support
  PM / Domains: Provide dummy governors if CONFIG_PM_GENERIC_DOMAINS=n
  cpufreq: brcmstb-avs-cpufreq: remove unnecessary platform_set_drvdata()
  ...
hifive-unleashed-5.1
Linus Torvalds 2017-02-20 17:41:31 -08:00
parent 7aa7d60811 eee77a8a0d
commit 02c3de1105
77 changed files with 4162 additions and 2504 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
Documentation/ABI/testing/sysfs-class-devfreq-event 100644
View File

@ -0,0 +1,25 @@
What: /sys/class/devfreq-event/event(x)/
Date: January 2017
Contact: Chanwoo Choi <cw00.choi@samsung.com>
Description:
Provide a place in sysfs for the devfreq-event objects.
This allows accessing various devfreq-event specific variables.
The name of devfreq-event object denoted as 'event(x)' which
includes the unique number of 'x' for each devfreq-event object.
What: /sys/class/devfreq-event/event(x)/name
Date: January 2017
Contact: Chanwoo Choi <cw00.choi@samsung.com>
Description:
The /sys/class/devfreq-event/event(x)/name attribute contains
the name of the devfreq-event object. This attribute is
read-only.
What: /sys/class/devfreq-event/event(x)/enable_count
Date: January 2017
Contact: Chanwoo Choi <cw00.choi@samsung.com>
Description:
The /sys/class/devfreq-event/event(x)/enable_count attribute
contains the reference count to enable the devfreq-event
object. If the device is enabled, the value of attribute is
greater than zero.

24
Documentation/cpu-freq/core.txt
View File

@ -8,6 +8,8 @@
Dominik Brodowski <linux@brodo.de>
David Kimdon <dwhedon@debian.org>
Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Viresh Kumar <viresh.kumar@linaro.org>
@ -36,10 +38,11 @@ speed limits (like LCD drivers on ARM architecture). Additionally, the
kernel "constant" loops_per_jiffy is updated on frequency changes
here.
Reference counting is done by cpufreq_get_cpu and cpufreq_put_cpu,
which make sure that the cpufreq processor driver is correctly
registered with the core, and will not be unloaded until
cpufreq_put_cpu is called.
Reference counting of the cpufreq policies is done by cpufreq_cpu_get
and cpufreq_cpu_put, which make sure that the cpufreq driver is
correctly registered with the core, and will not be unloaded until
cpufreq_put_cpu is called. That also ensures that the respective cpufreq
policy doesn't get freed while being used.
2. CPUFreq notifiers
====================
@ -69,18 +72,16 @@ CPUFreq policy notifier is called twice for a policy transition:
The phase is specified in the second argument to the notifier.
The third argument, a void *pointer, points to a struct cpufreq_policy
consisting of five values: cpu, min, max, policy and max_cpu_freq. min
and max are the lower and upper frequencies (in kHz) of the new
policy, policy the new policy, cpu the number of the affected CPU; and
max_cpu_freq the maximum supported CPU frequency. This value is given
for informational purposes only.
consisting of several values, including min, max (the lower and upper
frequencies (in kHz) of the new policy).
2.2 CPUFreq transition notifiers
--------------------------------
These are notified twice when the CPUfreq driver switches the CPU core
frequency and this change has any external implications.
These are notified twice for each online CPU in the policy, when the
CPUfreq driver switches the CPU core frequency and this change has no
any external implications.
The second argument specifies the phase - CPUFREQ_PRECHANGE or
CPUFREQ_POSTCHANGE.
@ -90,6 +91,7 @@ values:
cpu - number of the affected CPU
old - old frequency
new - new frequency
flags - flags of the cpufreq driver
3. CPUFreq Table Generation with Operating Performance Point (OPP)
==================================================================

171
Documentation/cpu-freq/cpu-drivers.txt
View File

@ -9,6 +9,8 @@
Dominik Brodowski <linux@brodo.de>
Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Viresh Kumar <viresh.kumar@linaro.org>
@ -49,49 +51,65 @@ using cpufreq_register_driver()
What shall this struct cpufreq_driver contain?
cpufreq_driver.name - The name of this driver.
.name - The name of this driver.
cpufreq_driver.init - A pointer to the per-CPU initialization
function.
.init - A pointer to the per-policy initialization function.
cpufreq_driver.verify - A pointer to a "verification" function.
.verify - A pointer to a "verification" function.
cpufreq_driver.setpolicy _or_
cpufreq_driver.target/
target_index - See below on the differences.
.setpolicy _or_ .fast_switch _or_ .target _or_ .target_index - See
below on the differences.
And optionally
cpufreq_driver.exit - A pointer to a per-CPU cleanup
function called during CPU_POST_DEAD
phase of cpu hotplug process.
.flags - Hints for the cpufreq core.
cpufreq_driver.stop_cpu - A pointer to a per-CPU stop function
called during CPU_DOWN_PREPARE phase of
cpu hotplug process.
.driver_data - cpufreq driver specific data.
cpufreq_driver.resume - A pointer to a per-CPU resume function
which is called with interrupts disabled
and _before_ the pre-suspend frequency
and/or policy is restored by a call to
->target/target_index or ->setpolicy.
.resolve_freq - Returns the most appropriate frequency for a target
frequency. Doesn't change the frequency though.
cpufreq_driver.attr - A pointer to a NULL-terminated list of
"struct freq_attr" which allow to
export values to sysfs.
.get_intermediate and target_intermediate - Used to switch to stable
frequency while changing CPU frequency.
cpufreq_driver.get_intermediate
and target_intermediate Used to switch to stable frequency while
changing CPU frequency.
.get - Returns current frequency of the CPU.
.bios_limit - Returns HW/BIOS max frequency limitations for the CPU.
.exit - A pointer to a per-policy cleanup function called during
CPU_POST_DEAD phase of cpu hotplug process.
.stop_cpu - A pointer to a per-policy stop function called during
CPU_DOWN_PREPARE phase of cpu hotplug process.
.suspend - A pointer to a per-policy suspend function which is called
with interrupts disabled and _after_ the governor is stopped for the
policy.
.resume - A pointer to a per-policy resume function which is called
with interrupts disabled and _before_ the governor is started again.
.ready - A pointer to a per-policy ready function which is called after
the policy is fully initialized.
.attr - A pointer to a NULL-terminated list of "struct freq_attr" which
allow to export values to sysfs.
.boost_enabled - If set, boost frequencies are enabled.
.set_boost - A pointer to a per-policy function to enable/disable boost
frequencies.
1.2 Per-CPU Initialization
--------------------------
Whenever a new CPU is registered with the device model, or after the
cpufreq driver registers itself, the per-CPU initialization function
cpufreq_driver.init is called. It takes a struct cpufreq_policy
*policy as argument. What to do now?
cpufreq driver registers itself, the per-policy initialization function
cpufreq_driver.init is called if no cpufreq policy existed for the CPU.
Note that the .init() and .exit() routines are called only once for the
policy and not for each CPU managed by the policy. It takes a struct
cpufreq_policy *policy as argument. What to do now?
If necessary, activate the CPUfreq support on your CPU.
@ -117,47 +135,45 @@ policy->governor must contain the "default policy" for
cpufreq_driver.setpolicy or
cpufreq_driver.target/target_index is called
with these values.
policy->cpus Update this with the masks of the
(online + offline) CPUs that do DVFS
along with this CPU (i.e. that share
clock/voltage rails with it).
For setting some of these values (cpuinfo.min[max]_freq, policy->min[max]), the
frequency table helpers might be helpful. See the section 2 for more information
on them.
SMP systems normally have same clock source for a group of cpus. For these the
.init() would be called only once for the first online cpu. Here the .init()
routine must initialize policy->cpus with mask of all possible cpus (Online +
Offline) that share the clock. Then the core would copy this mask onto
policy->related_cpus and will reset policy->cpus to carry only online cpus.
1.3 verify
------------
----------
When the user decides a new policy (consisting of
"policy,governor,min,max") shall be set, this policy must be validated
so that incompatible values can be corrected. For verifying these
values, a frequency table helper and/or the
cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned
int min_freq, unsigned int max_freq) function might be helpful. See
section 2 for details on frequency table helpers.
values cpufreq_verify_within_limits(struct cpufreq_policy *policy,
unsigned int min_freq, unsigned int max_freq) function might be helpful.
See section 2 for details on frequency table helpers.
You need to make sure that at least one valid frequency (or operating
range) is within policy->min and policy->max. If necessary, increase
policy->max first, and only if this is no solution, decrease policy->min.
1.4 target/target_index or setpolicy?
----------------------------
1.4 target or target_index or setpolicy or fast_switch?
-------------------------------------------------------
Most cpufreq drivers or even most cpu frequency scaling algorithms
only allow the CPU to be set to one frequency. For these, you use the
->target/target_index call.
only allow the CPU frequency to be set to predefined fixed values. For
these, you use the ->target(), ->target_index() or ->fast_switch()
callbacks.
Some cpufreq-capable processors switch the frequency between certain
limits on their own. These shall use the ->setpolicy call
Some cpufreq capable processors switch the frequency between certain
limits on their own. These shall use the ->setpolicy() callback.
1.5. target/target_index
-------------
------------------------
The target_index call has two arguments: struct cpufreq_policy *policy,
and unsigned int index (into the exposed frequency table).
@ -186,9 +202,20 @@ actual frequency must be determined using the following rules:
Here again the frequency table helper might assist you - see section 2
for details.
1.6. fast_switch
----------------
1.6 setpolicy
---------------
This function is used for frequency switching from scheduler's context.
Not all drivers are expected to implement it, as sleeping from within
this callback isn't allowed. This callback must be highly optimized to
do switching as fast as possible.
This function has two arguments: struct cpufreq_policy *policy and
unsigned int target_frequency.
1.7 setpolicy
-------------
The setpolicy call only takes a struct cpufreq_policy *policy as
argument. You need to set the lower limit of the in-processor or
@ -198,7 +225,7 @@ setting when policy->policy is CPUFREQ_POLICY_PERFORMANCE, and a
powersaving-oriented setting when CPUFREQ_POLICY_POWERSAVE. Also check
the reference implementation in drivers/cpufreq/longrun.c
1.7 get_intermediate and target_intermediate
1.8 get_intermediate and target_intermediate
--------------------------------------------
Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION unset.
@ -222,42 +249,36 @@ failures as core would send notifications for that.
As most cpufreq processors only allow for being set to a few specific
frequencies, a "frequency table" with some functions might assist in
some work of the processor driver. Such a "frequency table" consists
of an array of struct cpufreq_frequency_table entries, with any value in
"driver_data" you want to use, and the corresponding frequency in
"frequency". At the end of the table, you need to add a
cpufreq_frequency_table entry with frequency set to CPUFREQ_TABLE_END. And
if you want to skip one entry in the table, set the frequency to
CPUFREQ_ENTRY_INVALID. The entries don't need to be in ascending
order.
some work of the processor driver. Such a "frequency table" consists of
an array of struct cpufreq_frequency_table entries, with driver specific
values in "driver_data", the corresponding frequency in "frequency" and
flags set. At the end of the table, you need to add a
cpufreq_frequency_table entry with frequency set to CPUFREQ_TABLE_END.
And if you want to skip one entry in the table, set the frequency to
CPUFREQ_ENTRY_INVALID. The entries don't need to be in sorted in any
particular order, but if they are cpufreq core will do DVFS a bit
quickly for them as search for best match is faster.
By calling cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
struct cpufreq_frequency_table *table);
the cpuinfo.min_freq and cpuinfo.max_freq values are detected, and
policy->min and policy->max are set to the same values. This is
helpful for the per-CPU initialization stage.
By calling cpufreq_table_validate_and_show(), the cpuinfo.min_freq and
cpuinfo.max_freq values are detected, and policy->min and policy->max
are set to the same values. This is helpful for the per-CPU
initialization stage.
int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
struct cpufreq_frequency_table *table);
assures that at least one valid frequency is within policy->min and
policy->max, and all other criteria are met. This is helpful for the
->verify call.
cpufreq_frequency_table_verify() assures that at least one valid
frequency is within policy->min and policy->max, and all other criteria
are met. This is helpful for the ->verify call.
int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation);
is the corresponding frequency table helper for the ->target
stage. Just pass the values to this function, and this function
returns the number of the frequency table entry which contains
the frequency the CPU shall be set to.
cpufreq_frequency_table_target() is the corresponding frequency table
helper for the ->target stage. Just pass the values to this function,
and this function returns the of the frequency table entry which
contains the frequency the CPU shall be set to.
The following macros can be used as iterators over cpufreq_frequency_table:
cpufreq_for_each_entry(pos, table) - iterates over all entries of frequency
table.
cpufreq-for_each_valid_entry(pos, table) - iterates over all entries,
cpufreq_for_each_valid_entry(pos, table) - iterates over all entries,
excluding CPUFREQ_ENTRY_INVALID frequencies.
Use arguments "pos" - a cpufreq_frequency_table * as a loop cursor and
"table" - the cpufreq_frequency_table * you want to iterate over.

24
Documentation/cpu-freq/cpufreq-stats.txt
View File

@ -34,10 +34,10 @@ cpufreq stats provides following statistics (explained in detail below).
- total_trans
- trans_table
All the statistics will be from the time the stats driver has been inserted
to the time when a read of a particular statistic is done. Obviously, stats
driver will not have any information about the frequency transitions before
the stats driver insertion.
All the statistics will be from the time the stats driver has been inserted
(or the time the stats were reset) to the time when a read of a particular
statistic is done. Obviously, stats driver will not have any information
about the frequency transitions before the stats driver insertion.
--------------------------------------------------------------------------------
<mysystem>:/sys/devices/system/cpu/cpu0/cpufreq/stats # ls -l
@ -110,25 +110,13 @@ Config Main Menu
CPU Frequency scaling --->
[*] CPU Frequency scaling
[*] CPU frequency translation statistics
[*] CPU frequency translation statistics details
"CPU Frequency scaling" (CONFIG_CPU_FREQ) should be enabled to configure
cpufreq-stats.
"CPU frequency translation statistics" (CONFIG_CPU_FREQ_STAT) provides the
basic statistics which includes time_in_state and total_trans.
statistics which includes time_in_state, total_trans and trans_table.
"CPU frequency translation statistics details" (CONFIG_CPU_FREQ_STAT_DETAILS)
provides fine grained cpufreq stats by trans_table. The reason for having a
separate config option for trans_table is:
- trans_table goes against the traditional /sysfs rule of one value per
interface. It provides a whole bunch of value in a 2 dimensional matrix
form.
Once these two options are enabled and your CPU supports cpufrequency, you
Once this option is enabled and your CPU supports cpufrequency, you
will be able to see the CPU frequency statistics in /sysfs.

304
Documentation/cpu-freq/governors.txt
View File

@ -10,6 +10,8 @@
Dominik Brodowski <linux@brodo.de>
some additions and corrections by Nico Golde <nico@ngolde.de>
Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Viresh Kumar <viresh.kumar@linaro.org>
@ -28,32 +30,27 @@ Contents:
2.3 Userspace
2.4 Ondemand
2.5 Conservative
2.6 Schedutil
3. The Governor Interface in the CPUfreq Core
4. References
1. What Is A CPUFreq Governor?
==============================
Most cpufreq drivers (except the intel_pstate and longrun) or even most
cpu frequency scaling algorithms only offer the CPU to be set to one
frequency. In order to offer dynamic frequency scaling, the cpufreq
core must be able to tell these drivers of a "target frequency". So
these specific drivers will be transformed to offer a "->target/target_index"
call instead of the existing "->setpolicy" call. For "longrun", all
stays the same, though.
cpu frequency scaling algorithms only allow the CPU frequency to be set
to predefined fixed values. In order to offer dynamic frequency
scaling, the cpufreq core must be able to tell these drivers of a
"target frequency". So these specific drivers will be transformed to
offer a "->target/target_index/fast_switch()" call instead of the
"->setpolicy()" call. For set_policy drivers, all stays the same,
though.
How to decide what frequency within the CPUfreq policy should be used?
That's done using "cpufreq governors". Two are already in this patch
-- they're the already existing "powersave" and "performance" which
set the frequency statically to the lowest or highest frequency,
respectively. At least two more such governors will be ready for
addition in the near future, but likely many more as there are various
different theories and models about dynamic frequency scaling
around. Using such a generic interface as cpufreq offers to scaling
governors, these can be tested extensively, and the best one can be
selected for each specific use.
That's done using "cpufreq governors".
Basically, it's the following flow graph:
@ -71,7 +68,7 @@ CPU can be set to switch independently | CPU can only be set
/ the limits of policy->{min,max}
/ \
/ \
Using the ->setpolicy call, Using the ->target/target_index call,
Using the ->setpolicy call, Using the ->target/target_index/fast_switch call,
the limits and the the frequency closest
"policy" is set. to target_freq is set.
It is assured that it
@ -109,114 +106,159 @@ directory.
2.4 Ondemand
------------
The CPUfreq governor "ondemand" sets the CPU depending on the
current usage. To do this the CPU must have the capability to
switch the frequency very quickly. There are a number of sysfs file
accessible parameters:
The CPUfreq governor "ondemand" sets the CPU frequency depending on the
current system load. Load estimation is triggered by the scheduler
through the update_util_data->func hook; when triggered, cpufreq checks
the CPU-usage statistics over the last period and the governor sets the
CPU accordingly. The CPU must have the capability to switch the
frequency very quickly.
sampling_rate: measured in uS (10^-6 seconds), this is how often you
want the kernel to look at the CPU usage and to make decisions on
what to do about the frequency. Typically this is set to values of
around '10000' or more. It's default value is (cmp. with users-guide.txt):
transition_latency * 1000
Be aware that transition latency is in ns and sampling_rate is in us, so you
get the same sysfs value by default.
Sampling rate should always get adjusted considering the transition latency
To set the sampling rate 750 times as high as the transition latency
in the bash (as said, 1000 is default), do:
echo `$(($(cat cpuinfo_transition_latency) * 750 / 1000)) \
>ondemand/sampling_rate
Sysfs files:
sampling_rate_min:
The sampling rate is limited by the HW transition latency:
transition_latency * 100
Or by kernel restrictions:
If CONFIG_NO_HZ_COMMON is set, the limit is 10ms fixed.
If CONFIG_NO_HZ_COMMON is not set or nohz=off boot parameter is used, the
limits depend on the CONFIG_HZ option:
HZ=1000: min=20000us (20ms)
HZ=250: min=80000us (80ms)
HZ=100: min=200000us (200ms)
The highest value of kernel and HW latency restrictions is shown and
used as the minimum sampling rate.
* sampling_rate:
up_threshold: defines what the average CPU usage between the samplings
of 'sampling_rate' needs to be for the kernel to make a decision on
whether it should increase the frequency. For example when it is set
to its default value of '95' it means that between the checking
intervals the CPU needs to be on average more than 95% in use to then
decide that the CPU frequency needs to be increased.
Measured in uS (10^-6 seconds), this is how often you want the kernel
to look at the CPU usage and to make decisions on what to do about the
frequency. Typically this is set to values of around '10000' or more.
It's default value is (cmp. with users-guide.txt): transition_latency
* 1000. Be aware that transition latency is in ns and sampling_rate
is in us, so you get the same sysfs value by default. Sampling rate
should always get adjusted considering the transition latency to set
the sampling rate 750 times as high as the transition latency in the
bash (as said, 1000 is default), do:
ignore_nice_load: this parameter takes a value of '0' or '1'. When
set to '0' (its default), all processes are counted towards the
'cpu utilisation' value. When set to '1', the processes that are
run with a 'nice' value will not count (and thus be ignored) in the
overall usage calculation. This is useful if you are running a CPU
intensive calculation on your laptop that you do not care how long it
takes to complete as you can 'nice' it and prevent it from taking part
in the deciding process of whether to increase your CPU frequency.
$ echo `$(($(cat cpuinfo_transition_latency) * 750 / 1000)) > ondemand/sampling_rate
sampling_down_factor: this parameter controls the rate at which the
kernel makes a decision on when to decrease the frequency while running
at top speed. When set to 1 (the default) decisions to reevaluate load
are made at the same interval regardless of current clock speed. But
when set to greater than 1 (e.g. 100) it acts as a multiplier for the
scheduling interval for reevaluating load when the CPU is at its top
speed due to high load. This improves performance by reducing the overhead
of load evaluation and helping the CPU stay at its top speed when truly
busy, rather than shifting back and forth in speed. This tunable has no
effect on behavior at lower speeds/lower CPU loads.
* sampling_rate_min:
powersave_bias: this parameter takes a value between 0 to 1000. It
defines the percentage (times 10) value of the target frequency that
will be shaved off of the target. For example, when set to 100 -- 10%,
when ondemand governor would have targeted 1000 MHz, it will target
1000 MHz - (10% of 1000 MHz) = 900 MHz instead. This is set to 0
(disabled) by default.
When AMD frequency sensitivity powersave bias driver --
drivers/cpufreq/amd_freq_sensitivity.c is loaded, this parameter
defines the workload frequency sensitivity threshold in which a lower
frequency is chosen instead of ondemand governor's original target.
The frequency sensitivity is a hardware reported (on AMD Family 16h
Processors and above) value between 0 to 100% that tells software how
the performance of the workload running on a CPU will change when
frequency changes. A workload with sensitivity of 0% (memory/IO-bound)
will not perform any better on higher core frequency, whereas a
workload with sensitivity of 100% (CPU-bound) will perform better
higher the frequency. When the driver is loaded, this is set to 400
by default -- for CPUs running workloads with sensitivity value below
40%, a lower frequency is chosen. Unloading the driver or writing 0
will disable this feature.
The sampling rate is limited by the HW transition latency:
transition_latency * 100
Or by kernel restrictions:
- If CONFIG_NO_HZ_COMMON is set, the limit is 10ms fixed.
- If CONFIG_NO_HZ_COMMON is not set or nohz=off boot parameter is
used, the limits depend on the CONFIG_HZ option:
HZ=1000: min=20000us (20ms)
HZ=250: min=80000us (80ms)
HZ=100: min=200000us (200ms)
The highest value of kernel and HW latency restrictions is shown and
used as the minimum sampling rate.
* up_threshold:
This defines what the average CPU usage between the samplings of
'sampling_rate' needs to be for the kernel to make a decision on
whether it should increase the frequency. For example when it is set
to its default value of '95' it means that between the checking
intervals the CPU needs to be on average more than 95% in use to then
decide that the CPU frequency needs to be increased.
* ignore_nice_load:
This parameter takes a value of '0' or '1'. When set to '0' (its
default), all processes are counted towards the 'cpu utilisation'
value. When set to '1', the processes that are run with a 'nice'
value will not count (and thus be ignored) in the overall usage
calculation. This is useful if you are running a CPU intensive
calculation on your laptop that you do not care how long it takes to
complete as you can 'nice' it and prevent it from taking part in the
deciding process of whether to increase your CPU frequency.
* sampling_down_factor:
This parameter controls the rate at which the kernel makes a decision
on when to decrease the frequency while running at top speed. When set
to 1 (the default) decisions to reevaluate load are made at the same
interval regardless of current clock speed. But when set to greater
than 1 (e.g. 100) it acts as a multiplier for the scheduling interval
for reevaluating load when the CPU is at its top speed due to high
load. This improves performance by reducing the overhead of load
evaluation and helping the CPU stay at its top speed when truly busy,
rather than shifting back and forth in speed. This tunable has no
effect on behavior at lower speeds/lower CPU loads.
* powersave_bias:
This parameter takes a value between 0 to 1000. It defines the
percentage (times 10) value of the target frequency that will be
shaved off of the target. For example, when set to 100 -- 10%, when
ondemand governor would have targeted 1000 MHz, it will target
1000 MHz - (10% of 1000 MHz) = 900 MHz instead. This is set to 0
(disabled) by default.
When AMD frequency sensitivity powersave bias driver --
drivers/cpufreq/amd_freq_sensitivity.c is loaded, this parameter
defines the workload frequency sensitivity threshold in which a lower
frequency is chosen instead of ondemand governor's original target.
The frequency sensitivity is a hardware reported (on AMD Family 16h
Processors and above) value between 0 to 100% that tells software how
the performance of the workload running on a CPU will change when
frequency changes. A workload with sensitivity of 0% (memory/IO-bound)
will not perform any better on higher core frequency, whereas a
workload with sensitivity of 100% (CPU-bound) will perform better
higher the frequency. When the driver is loaded, this is set to 400 by
default -- for CPUs running workloads with sensitivity value below
40%, a lower frequency is chosen. Unloading the driver or writing 0
will disable this feature.
2.5 Conservative
----------------
The CPUfreq governor "conservative", much like the "ondemand"
governor, sets the CPU depending on the current usage. It differs in
behaviour in that it gracefully increases and decreases the CPU speed
rather than jumping to max speed the moment there is any load on the
CPU. This behaviour more suitable in a battery powered environment.
The governor is tweaked in the same manner as the "ondemand" governor
through sysfs with the addition of:
governor, sets the CPU frequency depending on the current usage. It
differs in behaviour in that it gracefully increases and decreases the
CPU speed rather than jumping to max speed the moment there is any load
on the CPU. This behaviour is more suitable in a battery powered
environment. The governor is tweaked in the same manner as the
"ondemand" governor through sysfs with the addition of:
freq_step: this describes what percentage steps the cpu freq should be
increased and decreased smoothly by. By default the cpu frequency will
increase in 5% chunks of your maximum cpu frequency. You can change this
value to anywhere between 0 and 100 where '0' will effectively lock your
CPU at a speed regardless of its load whilst '100' will, in theory, make
it behave identically to the "ondemand" governor.
* freq_step:
down_threshold: same as the 'up_threshold' found for the "ondemand"
governor but for the opposite direction. For example when set to its
default value of '20' it means that if the CPU usage needs to be below
20% between samples to have the frequency decreased.
This describes what percentage steps the cpu freq should be increased
and decreased smoothly by. By default the cpu frequency will increase
in 5% chunks of your maximum cpu frequency. You can change this value
to anywhere between 0 and 100 where '0' will effectively lock your CPU
at a speed regardless of its load whilst '100' will, in theory, make
it behave identically to the "ondemand" governor.
* down_threshold:
Same as the 'up_threshold' found for the "ondemand" governor but for
the opposite direction. For example when set to its default value of
'20' it means that if the CPU usage needs to be below 20% between
samples to have the frequency decreased.
* sampling_down_factor:
Similar functionality as in "ondemand" governor. But in
"conservative", it controls the rate at which the kernel makes a
decision on when to decrease the frequency while running in any speed.
Load for frequency increase is still evaluated every sampling rate.
2.6 Schedutil
-------------
The "schedutil" governor aims at better integration with the Linux
kernel scheduler. Load estimation is achieved through the scheduler's
Per-Entity Load Tracking (PELT) mechanism, which also provides
information about the recent load [1]. This governor currently does
load based DVFS only for tasks managed by CFS. RT and DL scheduler tasks
are always run at the highest frequency. Unlike all the other
governors, the code is located under the kernel/sched/ directory.
Sysfs files:
* rate_limit_us:
This contains a value in microseconds. The governor waits for
rate_limit_us time before reevaluating the load again, after it has
evaluated the load once.
For an in-depth comparison with the other governors refer to [2].
sampling_down_factor: similar functionality as in "ondemand" governor.
But in "conservative", it controls the rate at which the kernel makes
a decision on when to decrease the frequency while running in any
speed. Load for frequency increase is still evaluated every
sampling rate.
3. The Governor Interface in the CPUfreq Core
=============================================
@ -225,26 +267,10 @@ A new governor must register itself with the CPUfreq core using
"cpufreq_register_governor". The struct cpufreq_governor, which has to
be passed to that function, must contain the following values:
governor->name - A unique name for this governor
governor->governor - The governor callback function
governor->owner - .THIS_MODULE for the governor module (if
appropriate)
The governor->governor callback is called with the current (or to-be-set)
cpufreq_policy struct for that CPU, and an unsigned int event. The
following events are currently defined:
CPUFREQ_GOV_START: This governor shall start its duty for the CPU
policy->cpu
CPUFREQ_GOV_STOP: This governor shall end its duty for the CPU
policy->cpu
CPUFREQ_GOV_LIMITS: The limits for CPU policy->cpu have changed to
policy->min and policy->max.
If you need other "events" externally of your driver, _only_ use the
cpufreq_governor_l(unsigned int cpu, unsigned int event) call to the
CPUfreq core to ensure proper locking.
governor->name - A unique name for this governor.
governor->owner - .THIS_MODULE for the governor module (if appropriate).
plus a set of hooks to the functions implementing the governor's logic.
The CPUfreq governor may call the CPU processor driver using one of
these two functions:
@ -258,12 +284,18 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy,
unsigned int relation);
target_freq must be within policy->min and policy->max, of course.
What's the difference between these two functions? When your governor
still is in a direct code path of a call to governor->governor, the
per-CPU cpufreq lock is still held in the cpufreq core, and there's
no need to lock it again (in fact, this would cause a deadlock). So
use __cpufreq_driver_target only in these cases. In all other cases
(for example, when there's a "daemonized" function that wakes up
every second), use cpufreq_driver_target to lock the cpufreq per-CPU
lock before the command is passed to the cpufreq processor driver.
What's the difference between these two functions? When your governor is
in a direct code path of a call to governor callbacks, like
governor->start(), the policy->rwsem is still held in the cpufreq core,
and there's no need to lock it again (in fact, this would cause a
deadlock). So use __cpufreq_driver_target only in these cases. In all
other cases (for example, when there's a "daemonized" function that
wakes up every second), use cpufreq_driver_target to take policy->rwsem
before the command is passed to the cpufreq driver.
4. References
=============
[1] Per-entity load tracking: https://lwn.net/Articles/531853/
[2] Improvements in CPU frequency management: https://lwn.net/Articles/682391/

25
Documentation/cpu-freq/index.txt
View File

@ -18,16 +18,29 @@
Documents in this directory:
----------------------------
core.txt - General description of the CPUFreq core and
of CPUFreq notifiers
cpu-drivers.txt - How to implement a new cpufreq processor driver
amd-powernow.txt - AMD powernow driver specific file.
boost.txt - Frequency boosting support.
core.txt - General description of the CPUFreq core and
of CPUFreq notifiers.
cpu-drivers.txt - How to implement a new cpufreq processor driver.
cpufreq-nforce2.txt - nVidia nForce2 platform specific file.
cpufreq-stats.txt - General description of sysfs cpufreq stats.
governors.txt - What are cpufreq governors and how to
implement them?
index.txt - File index, Mailing list and Links (this document)
intel-pstate.txt - Intel pstate cpufreq driver specific file.
pcc-cpufreq.txt - PCC cpufreq driver specific file.
user-guide.txt - User Guide to CPUFreq
@ -35,9 +48,7 @@ Mailing List
------------
There is a CPU frequency changing CVS commit and general list where
you can report bugs, problems or submit patches. To post a message,
send an email to linux-pm@vger.kernel.org, to subscribe go to
http://vger.kernel.org/vger-lists.html#linux-pm and follow the
instructions there.
send an email to linux-pm@vger.kernel.org.
Links
-----
@ -48,7 +59,7 @@ how to access the CVS repository:
* http://cvs.arm.linux.org.uk/
the CPUFreq Mailing list:
* http://vger.kernel.org/vger-lists.html#cpufreq
* http://vger.kernel.org/vger-lists.html#linux-pm
Clock and voltage scaling for the SA-1100:
* http://www.lartmaker.nl/projects/scaling

15
Documentation/cpu-freq/intel-pstate.txt
View File

@ -85,6 +85,21 @@ Sysfs will show :
Refer to "Intel® 64 and IA-32 Architectures Software Developer’s Manual
Volume 3: System Programming Guide" to understand ratios.
There is one more sysfs attribute in /sys/devices/system/cpu/intel_pstate/
that can be used for controlling the operation mode of the driver:
status: Three settings are possible:
"off" - The driver is not in use at this time.
"active" - The driver works as a P-state governor (default).
"passive" - The driver works as a regular cpufreq one and collaborates
with the generic cpufreq governors (it sets P-states as
requested by those governors).
The current setting is returned by reads from this attribute. Writing one
of the above strings to it changes the operation mode as indicated by that
string, if possible. If HW-managed P-states (HWP) are enabled, it is not
possible to change the driver's operation mode and attempts to write to
this attribute will fail.
cpufreq sysfs for Intel P-State
Since this driver registers with cpufreq, cpufreq sysfs is also presented.

60
Documentation/cpu-freq/user-guide.txt
View File

@ -18,7 +18,7 @@
Contents:
---------
1. Supported Architectures and Processors
1.1 ARM
1.1 ARM and ARM64
1.2 x86
1.3 sparc64
1.4 ppc
@ -37,16 +37,10 @@ Contents:
1. Supported Architectures and Processors
=========================================
1.1 ARM
-------
The following ARM processors are supported by cpufreq:
ARM Integrator
ARM-SA1100
ARM-SA1110
Intel PXA
1.1 ARM and ARM64
-----------------
Almost all ARM and ARM64 platforms support CPU frequency scaling.
1.2 x86
-------
@ -69,6 +63,7 @@ Transmeta Crusoe
Transmeta Efficeon
VIA Cyrix 3 / C3
various processors on some ACPI 2.0-compatible systems [*]
And many more
[*] Only if "ACPI Processor Performance States" are available
to the ACPI<->BIOS interface.
@ -147,10 +142,19 @@ mounted it at /sys, the cpufreq interface is located in a subdirectory
"cpufreq" within the cpu-device directory
(e.g. /sys/devices/system/cpu/cpu0/cpufreq/ for the first CPU).
affected_cpus : List of Online CPUs that require software
coordination of frequency.
cpuinfo_cur_freq : Current frequency of the CPU as obtained from
the hardware, in KHz. This is the frequency
the CPU actually runs at.
cpuinfo_min_freq : this file shows the minimum operating
frequency the processor can run at(in kHz)
cpuinfo_max_freq : this file shows the maximum operating
frequency the processor can run at(in kHz)
cpuinfo_transition_latency The time it takes on this CPU to
switch between two frequencies in nano
seconds. If unknown or known to be
@ -163,25 +167,30 @@ cpuinfo_transition_latency The time it takes on this CPU to
userspace daemon. Make sure to not
switch the frequency too often
resulting in performance loss.
scaling_driver : this file shows what cpufreq driver is
used to set the frequency on this CPU
related_cpus : List of Online + Offline CPUs that need software
coordination of frequency.
scaling_available_frequencies : List of available frequencies, in KHz.
scaling_available_governors : this file shows the CPUfreq governors
available in this kernel. You can see the
currently activated governor in
scaling_cur_freq : Current frequency of the CPU as determined by
the governor and cpufreq core, in KHz. This is
the frequency the kernel thinks the CPU runs
at.
scaling_driver : this file shows what cpufreq driver is
used to set the frequency on this CPU
scaling_governor, and by "echoing" the name of another
governor you can change it. Please note
that some governors won't load - they only
work on some specific architectures or
processors.
cpuinfo_cur_freq : Current frequency of the CPU as obtained from
the hardware, in KHz. This is the frequency
the CPU actually runs at.
scaling_available_frequencies : List of available frequencies, in KHz.
scaling_min_freq and
scaling_max_freq show the current "policy limits" (in
kHz). By echoing new values into these
@ -190,16 +199,11 @@ scaling_max_freq show the current "policy limits" (in
first set scaling_max_freq, then
scaling_min_freq.
affected_cpus : List of Online CPUs that require software
coordination of frequency.
related_cpus : List of Online + Offline CPUs that need software
coordination of frequency.
scaling_cur_freq : Current frequency of the CPU as determined by
the governor and cpufreq core, in KHz. This is
the frequency the kernel thinks the CPU runs
at.
scaling_setspeed This can be read to get the currently programmed
value by the governor. This can be written to
change the current frequency for a group of
CPUs, represented by a policy. This is supported
currently only by the userspace governor.
bios_limit : If the BIOS tells the OS to limit a CPU to
lower frequencies, the user can read out the

128
Documentation/devicetree/bindings/cpufreq/ti-cpufreq.txt 100644
View File

@ -0,0 +1,128 @@
TI CPUFreq and OPP bindings
================================
Certain TI SoCs, like those in the am335x, am437x, am57xx, and dra7xx
families support different OPPs depending on the silicon variant in use.
The ti-cpufreq driver can use revision and an efuse value from the SoC to
provide the OPP framework with supported hardware information. This is
used to determine which OPPs from the operating-points-v2 table get enabled
when it is parsed by the OPP framework.
Required properties:
--------------------
In 'cpus' nodes:
- operating-points-v2: Phandle to the operating-points-v2 table to use.
In 'operating-points-v2' table:
- compatible: Should be
- 'operating-points-v2-ti-cpu' for am335x, am43xx, and dra7xx/am57xx SoCs
- syscon: A phandle pointing to a syscon node representing the control module
register space of the SoC.
Optional properties:
--------------------
For each opp entry in 'operating-points-v2' table:
- opp-supported-hw: Two bitfields indicating:
1. Which revision of the SoC the OPP is supported by
2. Which eFuse bits indicate this OPP is available
A bitwise AND is performed against these values and if any bit
matches, the OPP gets enabled.
Example:
--------
/* From arch/arm/boot/dts/am33xx.dtsi */
cpus {
#address-cells = <1>;
#size-cells = <0>;
cpu@0 {
compatible = "arm,cortex-a8";
device_type = "cpu";
reg = <0>;
operating-points-v2 = <&cpu0_opp_table>;
clocks = <&dpll_mpu_ck>;
clock-names = "cpu";
clock-latency = <300000>; /* From omap-cpufreq driver */
};
};
/*
* cpu0 has different OPPs depending on SoC revision and some on revisions
* 0x2 and 0x4 have eFuse bits that indicate if they are available or not
*/
cpu0_opp_table: opp-table {
compatible = "operating-points-v2-ti-cpu";
syscon = <&scm_conf>;
/*
* The three following nodes are marked with opp-suspend
* because they can not be enabled simultaneously on a
* single SoC.
*/
opp50@300000000 {
opp-hz = /bits/ 64 <300000000>;
opp-microvolt = <950000 931000 969000>;
opp-supported-hw = <0x06 0x0010>;
opp-suspend;
};
opp100@275000000 {
opp-hz = /bits/ 64 <275000000>;
opp-microvolt = <1100000 1078000 1122000>;
opp-supported-hw = <0x01 0x00FF>;
opp-suspend;
};
opp100@300000000 {
opp-hz = /bits/ 64 <300000000>;
opp-microvolt = <1100000 1078000 1122000>;
opp-supported-hw = <0x06 0x0020>;
opp-suspend;
};
opp100@500000000 {
opp-hz = /bits/ 64 <500000000>;
opp-microvolt = <1100000 1078000 1122000>;
opp-supported-hw = <0x01 0xFFFF>;
};
opp100@600000000 {
opp-hz = /bits/ 64 <600000000>;
opp-microvolt = <1100000 1078000 1122000>;
opp-supported-hw = <0x06 0x0040>;
};
opp120@600000000 {
opp-hz = /bits/ 64 <600000000>;
opp-microvolt = <1200000 1176000 1224000>;
opp-supported-hw = <0x01 0xFFFF>;
};
opp120@720000000 {
opp-hz = /bits/ 64 <720000000>;
opp-microvolt = <1200000 1176000 1224000>;
opp-supported-hw = <0x06 0x0080>;
};
oppturbo@720000000 {
opp-hz = /bits/ 64 <720000000>;
opp-microvolt = <1260000 1234800 1285200>;
opp-supported-hw = <0x01 0xFFFF>;
};
oppturbo@800000000 {
opp-hz = /bits/ 64 <800000000>;
opp-microvolt = <1260000 1234800 1285200>;
opp-supported-hw = <0x06 0x0100>;
};
oppnitro@1000000000 {
opp-hz = /bits/ 64 <1000000000>;
opp-microvolt = <1325000 1298500 1351500>;
opp-supported-hw = <0x04 0x0200>;
};
};

14
Documentation/devicetree/bindings/devfreq/exynos-bus.txt
View File

@ -123,6 +123,20 @@ Detailed correlation between sub-blocks and power line according to Exynos SoC:
|--- FSYS
|--- FSYS2
- In case of Exynos5433, there is VDD_INT power line as following:
VDD_INT |--- G2D (parent device)
|--- MSCL
|--- GSCL
|--- JPEG
|--- MFC
|--- HEVC
|--- BUS0
|--- BUS1
|--- BUS2
|--- PERIS (Fixed clock rate)
|--- PERIC (Fixed clock rate)
|--- FSYS (Fixed clock rate)
Example1:
Show the AXI buses of Exynos3250 SoC. Exynos3250 divides the buses to
power line (regulator). The MIF (Memory Interface) AXI bus is used to

52
Documentation/power/opp.txt
View File

@ -79,22 +79,6 @@ dependent subsystems such as cpufreq are left to the discretion of the SoC
specific framework which uses the OPP library. Similar care needs to be taken
care to refresh the cpufreq table in cases of these operations.
WARNING on OPP List locking mechanism:
-------------------------------------------------
OPP library uses RCU for exclusivity. RCU allows the query functions to operate
in multiple contexts and this synchronization mechanism is optimal for a read
intensive operations on data structure as the OPP library caters to.
To ensure that the data retrieved are sane, the users such as SoC framework
should ensure that the section of code operating on OPP queries are locked
using RCU read locks. The opp_find_freq_{exact,ceil,floor},
opp_get_{voltage, freq, opp_count} fall into this category.
opp_{add,enable,disable} are updaters which use mutex and implement it's own
RCU locking mechanisms. These functions should *NOT* be called under RCU locks
and other contexts that prevent blocking functions in RCU or mutex operations
from working.
2. Initial OPP List Registration
================================
The SoC implementation calls dev_pm_opp_add function iteratively to add OPPs per
@ -137,15 +121,18 @@ functions return the matching pointer representing the opp if a match is
found, else returns error. These errors are expected to be handled by standard
error checks such as IS_ERR() and appropriate actions taken by the caller.
Callers of these functions shall call dev_pm_opp_put() after they have used the
OPP. Otherwise the memory for the OPP will never get freed and result in
memleak.
dev_pm_opp_find_freq_exact - Search for an OPP based on an *exact* frequency and
availability. This function is especially useful to enable an OPP which
is not available by default.
Example: In a case when SoC framework detects a situation where a
higher frequency could be made available, it can use this function to
find the OPP prior to call the dev_pm_opp_enable to actually make it available.
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(dev, 1000000000, false);
rcu_read_unlock();
dev_pm_opp_put(opp);
/* dont operate on the pointer.. just do a sanity check.. */
if (IS_ERR(opp)) {
pr_err("frequency not disabled!\n");
@ -163,9 +150,8 @@ dev_pm_opp_find_freq_floor - Search for an available OPP which is *at most* the
frequency.
Example: To find the highest opp for a device:
freq = ULONG_MAX;
rcu_read_lock();
dev_pm_opp_find_freq_floor(dev, &freq);
rcu_read_unlock();
opp = dev_pm_opp_find_freq_floor(dev, &freq);
dev_pm_opp_put(opp);
dev_pm_opp_find_freq_ceil - Search for an available OPP which is *at least* the
provided frequency. This function is useful while searching for a
@ -173,17 +159,15 @@ dev_pm_opp_find_freq_ceil - Search for an available OPP which is *at least* the
frequency.
Example 1: To find the lowest opp for a device:
freq = 0;
rcu_read_lock();
dev_pm_opp_find_freq_ceil(dev, &freq);
rcu_read_unlock();
opp = dev_pm_opp_find_freq_ceil(dev, &freq);
dev_pm_opp_put(opp);
Example 2: A simplified implementation of a SoC cpufreq_driver->target:
soc_cpufreq_target(..)
{
/* Do stuff like policy checks etc. */
/* Find the best frequency match for the req */
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(dev, &freq);
rcu_read_unlock();
dev_pm_opp_put(opp);
if (!IS_ERR(opp))
soc_switch_to_freq_voltage(freq);
else
@ -208,9 +192,8 @@ dev_pm_opp_enable - Make a OPP available for operation.
implementation might choose to do something as follows:
if (cur_temp < temp_low_thresh) {
/* Enable 1GHz if it was disabled */
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(dev, 1000000000, false);
rcu_read_unlock();
dev_pm_opp_put(opp);
/* just error check */
if (!IS_ERR(opp))
ret = dev_pm_opp_enable(dev, 1000000000);
@ -224,9 +207,8 @@ dev_pm_opp_disable - Make an OPP to be not available for operation
choose to do something as follows:
if (cur_temp > temp_high_thresh) {
/* Disable 1GHz if it was enabled */
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(dev, 1000000000, true);
rcu_read_unlock();
dev_pm_opp_put(opp);
/* just error check */
if (!IS_ERR(opp))
ret = dev_pm_opp_disable(dev, 1000000000);
@ -249,10 +231,9 @@ dev_pm_opp_get_voltage - Retrieve the voltage represented by the opp pointer.
soc_switch_to_freq_voltage(freq)
{
/* do things */
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(dev, &freq);
v = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
if (v)
regulator_set_voltage(.., v);
/* do other things */
@ -266,12 +247,12 @@ dev_pm_opp_get_freq - Retrieve the freq represented by the opp pointer.
{
/* do things.. */
max_freq = ULONG_MAX;
rcu_read_lock();
max_opp = dev_pm_opp_find_freq_floor(dev,&max_freq);
requested_opp = dev_pm_opp_find_freq_ceil(dev,&freq);
if (!IS_ERR(max_opp) && !IS_ERR(requested_opp))
r = soc_test_validity(max_opp, requested_opp);
rcu_read_unlock();
dev_pm_opp_put(max_opp);
dev_pm_opp_put(requested_opp);
/* do other things */
}
soc_test_validity(..)
@ -289,7 +270,6 @@ dev_pm_opp_get_opp_count - Retrieve the number of available opps for a device
soc_notify_coproc_available_frequencies()
{
/* Do things */
rcu_read_lock();
num_available = dev_pm_opp_get_opp_count(dev);
speeds = kzalloc(sizeof(u32) * num_available, GFP_KERNEL);
/* populate the table in increasing order */
@ -298,8 +278,8 @@ dev_pm_opp_get_opp_count - Retrieve the number of available opps for a device
speeds[i] = freq;
freq++;
i++;
dev_pm_opp_put(opp);
}
rcu_read_unlock();
soc_notify_coproc(AVAILABLE_FREQs, speeds, num_available);
/* Do other things */

2
Documentation/power/states.txt
View File

@ -25,7 +25,7 @@ to be used subsequently to change to the one represented by that string.
Consequently, there are two ways to cause the system to go into the
Suspend-To-Idle sleep state. The first one is to write "freeze" directly to
/sys/power/state. The second one is to write "s2idle" to /sys/power/mem_sleep
and then to wrtie "mem" to /sys/power/state. Similarly, there are two ways
and then to write "mem" to /sys/power/state. Similarly, there are two ways
to cause the system to go into the Power-On Suspend sleep state (the strings to
write to the control files in that case are "standby" or "shallow" and "mem",
respectively) if that state is supported by the platform. In turn, there is

7
MAINTAINERS
View File

@ -2692,6 +2692,13 @@ F: drivers/irqchip/irq-brcmstb*
F: include/linux/bcm963xx_nvram.h
F: include/linux/bcm963xx_tag.h
BROADCOM BMIPS CPUFREQ DRIVER
M: Markus Mayer <mmayer@broadcom.com>
M: bcm-kernel-feedback-list@broadcom.com
L: linux-pm@vger.kernel.org
S: Maintained
F: drivers/cpufreq/bmips-cpufreq.c
BROADCOM TG3 GIGABIT ETHERNET DRIVER
M: Siva Reddy Kallam <siva.kallam@broadcom.com>
M: Prashant Sreedharan <prashant@broadcom.com>

2
arch/arm/configs/exynos_defconfig
View File

@ -24,7 +24,7 @@ CONFIG_ARM_APPENDED_DTB=y
CONFIG_ARM_ATAG_DTB_COMPAT=y
CONFIG_CMDLINE="root=/dev/ram0 rw ramdisk=8192 initrd=0x41000000,8M console=ttySAC1,115200 init=/linuxrc mem=256M"
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_STAT_DETAILS=y
CONFIG_CPU_FREQ_STAT=y
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=m
CONFIG_CPU_FREQ_GOV_USERSPACE=m

2
arch/arm/configs/multi_v5_defconfig
View File

@ -58,7 +58,7 @@ CONFIG_ZBOOT_ROM_BSS=0x0
CONFIG_ARM_APPENDED_DTB=y
CONFIG_ARM_ATAG_DTB_COMPAT=y
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_STAT_DETAILS=y
CONFIG_CPU_FREQ_STAT=y
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
CONFIG_CPU_IDLE=y
CONFIG_ARM_KIRKWOOD_CPUIDLE=y

2
arch/arm/configs/multi_v7_defconfig
View File

@ -132,7 +132,7 @@ CONFIG_ARM_ATAG_DTB_COMPAT=y
CONFIG_KEXEC=y
CONFIG_EFI=y
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_STAT_DETAILS=y
CONFIG_CPU_FREQ_STAT=y
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=m
CONFIG_CPU_FREQ_GOV_USERSPACE=m

2
arch/arm/configs/mvebu_v5_defconfig
View File

@ -44,7 +44,7 @@ CONFIG_ZBOOT_ROM_BSS=0x0
CONFIG_ARM_APPENDED_DTB=y
CONFIG_ARM_ATAG_DTB_COMPAT=y
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_STAT_DETAILS=y
CONFIG_CPU_FREQ_STAT=y
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
CONFIG_CPU_IDLE=y
CONFIG_ARM_KIRKWOOD_CPUIDLE=y

2
arch/arm/configs/pxa_defconfig
View File

@ -97,7 +97,7 @@ CONFIG_ZBOOT_ROM_BSS=0x0
CONFIG_CMDLINE="root=/dev/ram0 ro"
CONFIG_KEXEC=y
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_STAT_DETAILS=y
CONFIG_CPU_FREQ_STAT=y
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=m
CONFIG_CPU_FREQ_GOV_USERSPACE=m

2
arch/arm/configs/shmobile_defconfig
View File

@ -38,7 +38,7 @@ CONFIG_ZBOOT_ROM_BSS=0x0
CONFIG_ARM_APPENDED_DTB=y
CONFIG_KEXEC=y
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_STAT_DETAILS=y
CONFIG_CPU_FREQ_STAT=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=y
CONFIG_CPU_FREQ_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_ONDEMAND=y

5
arch/arm/mach-omap2/pm.c
View File

@ -130,17 +130,16 @@ static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
freq = clk_get_rate(clk);
clk_put(clk);
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(dev, &freq);
if (IS_ERR(opp)) {
rcu_read_unlock();
pr_err("%s: unable to find boot up OPP for vdd_%s\n",
__func__, vdd_name);
goto exit;
}
bootup_volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
if (!bootup_volt) {
pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
__func__, vdd_name);

2
arch/mips/Kconfig
View File

@ -1703,6 +1703,8 @@ config CPU_BMIPS
select WEAK_ORDERING
select CPU_SUPPORTS_HIGHMEM
select CPU_HAS_PREFETCH
select CPU_SUPPORTS_CPUFREQ
select MIPS_EXTERNAL_TIMER
help
Support for BMIPS32/3300/4350/4380 and BMIPS5000 processors.

16
arch/mips/configs/bmips_stb_defconfig
View File

@ -9,13 +9,20 @@ CONFIG_MIPS_O32_FP64_SUPPORT=y
# CONFIG_SWAP is not set
CONFIG_NO_HZ=y
CONFIG_BLK_DEV_INITRD=y
CONFIG_RD_GZIP=y
CONFIG_EXPERT=y
# CONFIG_VM_EVENT_COUNTERS is not set
# CONFIG_SLUB_DEBUG is not set
# CONFIG_BLK_DEV_BSG is not set
# CONFIG_IOSCHED_DEADLINE is not set
# CONFIG_IOSCHED_CFQ is not set
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_STAT=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=y
CONFIG_CPU_FREQ_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_ONDEMAND=y
CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y
CONFIG_CPU_FREQ_GOV_SCHEDUTIL=y
CONFIG_BMIPS_CPUFREQ=y
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_PACKET_DIAG=y
@ -24,7 +31,6 @@ CONFIG_INET=y
# CONFIG_INET_XFRM_MODE_TRANSPORT is not set
# CONFIG_INET_XFRM_MODE_TUNNEL is not set
# CONFIG_INET_XFRM_MODE_BEET is not set
# CONFIG_INET_LRO is not set
# CONFIG_INET_DIAG is not set
CONFIG_CFG80211=y
CONFIG_NL80211_TESTMODE=y
@ -34,8 +40,6 @@ CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
# CONFIG_STANDALONE is not set
# CONFIG_PREVENT_FIRMWARE_BUILD is not set
CONFIG_PRINTK_TIME=y
CONFIG_BRCMSTB_GISB_ARB=y
CONFIG_MTD=y
CONFIG_MTD_CFI=y
CONFIG_MTD_CFI_INTELEXT=y
@ -51,16 +55,15 @@ CONFIG_USB_USBNET=y
# CONFIG_INPUT is not set
# CONFIG_SERIO is not set
# CONFIG_VT is not set
# CONFIG_DEVKMEM is not set
CONFIG_SERIAL_8250=y
# CONFIG_SERIAL_8250_DEPRECATED_OPTIONS is not set
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_OF_PLATFORM=y
# CONFIG_HW_RANDOM is not set
CONFIG_POWER_SUPPLY=y
CONFIG_POWER_RESET=y
CONFIG_POWER_RESET_BRCMSTB=y
CONFIG_POWER_RESET_SYSCON=y
CONFIG_POWER_SUPPLY=y
# CONFIG_HWMON is not set
CONFIG_USB=y
CONFIG_USB_EHCI_HCD=y
@ -82,6 +85,7 @@ CONFIG_CIFS=y
CONFIG_NLS_CODEPAGE_437=y
CONFIG_NLS_ASCII=y
CONFIG_NLS_ISO8859_1=y
CONFIG_PRINTK_TIME=y
CONFIG_DEBUG_FS=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_CMDLINE_BOOL=y

1
arch/mips/configs/lemote2f_defconfig
View File

@ -40,7 +40,6 @@ CONFIG_PM_STD_PARTITION="/dev/hda3"
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_DEBUG=y
CONFIG_CPU_FREQ_STAT=m
CONFIG_CPU_FREQ_STAT_DETAILS=y
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=m
CONFIG_CPU_FREQ_GOV_USERSPACE=m

1
arch/powerpc/configs/ppc6xx_defconfig
View File

@ -62,7 +62,6 @@ CONFIG_MPC8610_HPCD=y
CONFIG_GEF_SBC610=y
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_STAT=m
CONFIG_CPU_FREQ_STAT_DETAILS=y
CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=m

2
arch/sh/configs/sh7785lcr_32bit_defconfig
View File

@ -25,7 +25,7 @@ CONFIG_SH_SH7785LCR=y
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_STAT_DETAILS=y
CONFIG_CPU_FREQ_STAT=y
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
CONFIG_SH_CPU_FREQ=y
CONFIG_HEARTBEAT=y

9
arch/x86/kernel/acpi/cstate.c
View File

@ -12,7 +12,6 @@
#include <linux/sched.h>
#include <acpi/processor.h>
#include <asm/acpi.h>
#include <asm/mwait.h>
#include <asm/special_insns.h>
@ -89,7 +88,8 @@ static long acpi_processor_ffh_cstate_probe_cpu(void *_cx)
retval = 0;
/* If the HW does not support any sub-states in this C-state */
if (num_cstate_subtype == 0) {
pr_warn(FW_BUG "ACPI MWAIT C-state 0x%x not supported by HW (0x%x)\n", cx->address, edx_part);
pr_warn(FW_BUG "ACPI MWAIT C-state 0x%x not supported by HW (0x%x)\n",
cx->address, edx_part);
retval = -1;
goto out;
}
@ -104,8 +104,8 @@ static long acpi_processor_ffh_cstate_probe_cpu(void *_cx)
if (!mwait_supported[cstate_type]) {
mwait_supported[cstate_type] = 1;
printk(KERN_DEBUG
"Monitor-Mwait will be used to enter C-%d "
"state\n", cx->type);
"Monitor-Mwait will be used to enter C-%d state\n",
cx->type);
}
snprintf(cx->desc,
ACPI_CX_DESC_LEN, "ACPI FFH INTEL MWAIT 0x%x",
@ -166,6 +166,7 @@ EXPORT_SYMBOL_GPL(acpi_processor_ffh_cstate_enter);
static int __init ffh_cstate_init(void)
{
struct cpuinfo_x86 *c = &boot_cpu_data;
if (c->x86_vendor != X86_VENDOR_INTEL)
return -1;

4
drivers/acpi/processor_perflib.c
View File

@ -75,10 +75,8 @@ static int acpi_processor_ppc_notifier(struct notifier_block *nb,
struct acpi_processor *pr;
unsigned int ppc = 0;
if (event == CPUFREQ_START && ignore_ppc <= 0) {
if (ignore_ppc < 0)
ignore_ppc = 0;
return 0;
}
if (ignore_ppc)
return 0;

2
drivers/base/cpu.c
View File

@ -17,6 +17,7 @@
#include <linux/of.h>
#include <linux/cpufeature.h>
#include <linux/tick.h>
#include <linux/pm_qos.h>
#include "base.h"
@ -376,6 +377,7 @@ int register_cpu(struct cpu *cpu, int num)
per_cpu(cpu_sys_devices, num) = &cpu->dev;
register_cpu_under_node(num, cpu_to_node(num));
dev_pm_qos_expose_latency_limit(&cpu->dev, 0);
return 0;
}

124
drivers/base/power/domain.c
View File

@ -130,7 +130,7 @@ static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev,
ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd);
/* Warn once for each IRQ safe dev in no sleep domain */
/* Warn once if IRQ safe dev in no sleep domain */
if (ret)
dev_warn_once(dev, "PM domain %s will not be powered off\n",
genpd->name);
@ -201,7 +201,7 @@ static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
smp_mb__after_atomic();
}
static int genpd_power_on(struct generic_pm_domain *genpd, bool timed)
static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
{
unsigned int state_idx = genpd->state_idx;
ktime_t time_start;
@ -231,7 +231,7 @@ static int genpd_power_on(struct generic_pm_domain *genpd, bool timed)
return ret;
}
static int genpd_power_off(struct generic_pm_domain *genpd, bool timed)
static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed)
{
unsigned int state_idx = genpd->state_idx;
ktime_t time_start;
@ -262,10 +262,10 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool timed)
}
/**
* genpd_queue_power_off_work - Queue up the execution of genpd_poweroff().
* genpd_queue_power_off_work - Queue up the execution of genpd_power_off().
* @genpd: PM domain to power off.
*
* Queue up the execution of genpd_poweroff() unless it's already been done
* Queue up the execution of genpd_power_off() unless it's already been done
* before.
*/
static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
@ -274,14 +274,14 @@ static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
}
/**
* genpd_poweron - Restore power to a given PM domain and its masters.
* genpd_power_on - Restore power to a given PM domain and its masters.
* @genpd: PM domain to power up.
* @depth: nesting count for lockdep.
*
* Restore power to @genpd and all of its masters so that it is possible to
* resume a device belonging to it.
*/
static int genpd_poweron(struct generic_pm_domain *genpd, unsigned int depth)
static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth)
{
struct gpd_link *link;
int ret = 0;
@ -300,7 +300,7 @@ static int genpd_poweron(struct generic_pm_domain *genpd, unsigned int depth)
genpd_sd_counter_inc(master);
genpd_lock_nested(master, depth + 1);
ret = genpd_poweron(master, depth + 1);
ret = genpd_power_on(master, depth + 1);
genpd_unlock(master);
if (ret) {
@ -309,7 +309,7 @@ static int genpd_poweron(struct generic_pm_domain *genpd, unsigned int depth)
}
}
ret = genpd_power_on(genpd, true);
ret = _genpd_power_on(genpd, true);
if (ret)
goto err;
@ -368,14 +368,14 @@ static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
}
/**
* genpd_poweroff - Remove power from a given PM domain.
* genpd_power_off - Remove power from a given PM domain.
* @genpd: PM domain to power down.
* @is_async: PM domain is powered down from a scheduled work
*
* If all of the @genpd's devices have been suspended and all of its subdomains
* have been powered down, remove power from @genpd.
*/
static int genpd_poweroff(struct generic_pm_domain *genpd, bool is_async)
static int genpd_power_off(struct generic_pm_domain *genpd, bool is_async)
{
struct pm_domain_data *pdd;
struct gpd_link *link;
@ -427,13 +427,13 @@ static int genpd_poweroff(struct generic_pm_domain *genpd, bool is_async)
/*
* If sd_count > 0 at this point, one of the subdomains hasn't
* managed to call genpd_poweron() for the master yet after
* incrementing it. In that case genpd_poweron() will wait
* managed to call genpd_power_on() for the master yet after
* incrementing it. In that case genpd_power_on() will wait
* for us to drop the lock, so we can call .power_off() and let
* the genpd_poweron() restore power for us (this shouldn't
* the genpd_power_on() restore power for us (this shouldn't
* happen very often).
*/
ret = genpd_power_off(genpd, true);
ret = _genpd_power_off(genpd, true);
if (ret)
return ret;
}
@ -459,7 +459,7 @@ static void genpd_power_off_work_fn(struct work_struct *work)
genpd = container_of(work, struct generic_pm_domain, power_off_work);
genpd_lock(genpd);
genpd_poweroff(genpd, true);
genpd_power_off(genpd, true);
genpd_unlock(genpd);
}
@ -578,7 +578,7 @@ static int genpd_runtime_suspend(struct device *dev)
return 0;
genpd_lock(genpd);
genpd_poweroff(genpd, false);
genpd_power_off(genpd, false);
genpd_unlock(genpd);
return 0;
@ -618,7 +618,7 @@ static int genpd_runtime_resume(struct device *dev)
}
genpd_lock(genpd);
ret = genpd_poweron(genpd, 0);
ret = genpd_power_on(genpd, 0);
genpd_unlock(genpd);
if (ret)
@ -658,7 +658,7 @@ err_poweroff:
if (!pm_runtime_is_irq_safe(dev) ||
(pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) {
genpd_lock(genpd);
genpd_poweroff(genpd, 0);
genpd_power_off(genpd, 0);
genpd_unlock(genpd);
}
@ -674,9 +674,9 @@ static int __init pd_ignore_unused_setup(char *__unused)
__setup("pd_ignore_unused", pd_ignore_unused_setup);
/**
* genpd_poweroff_unused - Power off all PM domains with no devices in use.
* genpd_power_off_unused - Power off all PM domains with no devices in use.
*/
static int __init genpd_poweroff_unused(void)
static int __init genpd_power_off_unused(void)
{
struct generic_pm_domain *genpd;
@ -694,7 +694,7 @@ static int __init genpd_poweroff_unused(void)
return 0;
}
late_initcall(genpd_poweroff_unused);
late_initcall(genpd_power_off_unused);
#if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_GENERIC_DOMAINS_OF)
@ -727,18 +727,20 @@ static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd,
}
/**
* genpd_sync_poweroff - Synchronously power off a PM domain and its masters.
* genpd_sync_power_off - Synchronously power off a PM domain and its masters.
* @genpd: PM domain to power off, if possible.
* @use_lock: use the lock.
* @depth: nesting count for lockdep.
*
* Check if the given PM domain can be powered off (during system suspend or
* hibernation) and do that if so. Also, in that case propagate to its masters.
*
* This function is only called in "noirq" and "syscore" stages of system power
* transitions, so it need not acquire locks (all of the "noirq" callbacks are
* executed sequentially, so it is guaranteed that it will never run twice in
* parallel).
* transitions. The "noirq" callbacks may be executed asynchronously, thus in
* these cases the lock must be held.
*/
static void genpd_sync_poweroff(struct generic_pm_domain *genpd)
static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock,
unsigned int depth)
{
struct gpd_link *link;
@ -751,26 +753,35 @@ static void genpd_sync_poweroff(struct generic_pm_domain *genpd)
/* Choose the deepest state when suspending */
genpd->state_idx = genpd->state_count - 1;
genpd_power_off(genpd, false);
_genpd_power_off(genpd, false);
genpd->status = GPD_STATE_POWER_OFF;
list_for_each_entry(link, &genpd->slave_links, slave_node) {
genpd_sd_counter_dec(link->master);
genpd_sync_poweroff(link->master);
if (use_lock)
genpd_lock_nested(link->master, depth + 1);
genpd_sync_power_off(link->master, use_lock, depth + 1);
if (use_lock)
genpd_unlock(link->master);
}
}
/**
* genpd_sync_poweron - Synchronously power on a PM domain and its masters.
* genpd_sync_power_on - Synchronously power on a PM domain and its masters.
* @genpd: PM domain to power on.
* @use_lock: use the lock.
* @depth: nesting count for lockdep.
*
* This function is only called in "noirq" and "syscore" stages of system power
* transitions, so it need not acquire locks (all of the "noirq" callbacks are
* executed sequentially, so it is guaranteed that it will never run twice in
* parallel).
* transitions. The "noirq" callbacks may be executed asynchronously, thus in
* these cases the lock must be held.
*/
static void genpd_sync_poweron(struct generic_pm_domain *genpd)
static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock,
unsigned int depth)
{
struct gpd_link *link;
@ -778,11 +789,18 @@ static void genpd_sync_poweron(struct generic_pm_domain *genpd)
return;
list_for_each_entry(link, &genpd->slave_links, slave_node) {
genpd_sync_poweron(link->master);
genpd_sd_counter_inc(link->master);
if (use_lock)
genpd_lock_nested(link->master, depth + 1);
genpd_sync_power_on(link->master, use_lock, depth + 1);
if (use_lock)
genpd_unlock(link->master);
}
genpd_power_on(genpd, false);
_genpd_power_on(genpd, false);
genpd->status = GPD_STATE_ACTIVE;
}
@ -888,13 +906,10 @@ static int pm_genpd_suspend_noirq(struct device *dev)
return ret;
}
/*
* Since all of the "noirq" callbacks are executed sequentially, it is
* guaranteed that this function will never run twice in parallel for
* the same PM domain, so it is not necessary to use locking here.
*/
genpd_lock(genpd);
genpd->suspended_count++;
genpd_sync_poweroff(genpd);
genpd_sync_power_off(genpd, true, 0);
genpd_unlock(genpd);
return 0;
}
@ -919,13 +934,10 @@ static int pm_genpd_resume_noirq(struct device *dev)
if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))
return 0;
/*
* Since all of the "noirq" callbacks are executed sequentially, it is
* guaranteed that this function will never run twice in parallel for
* the same PM domain, so it is not necessary to use locking here.
*/
genpd_sync_poweron(genpd);
genpd_lock(genpd);
genpd_sync_power_on(genpd, true, 0);
genpd->suspended_count--;
genpd_unlock(genpd);
if (genpd->dev_ops.stop && genpd->dev_ops.start)
ret = pm_runtime_force_resume(dev);
@ -1002,22 +1014,20 @@ static int pm_genpd_restore_noirq(struct device *dev)
return -EINVAL;
/*
* Since all of the "noirq" callbacks are executed sequentially, it is
* guaranteed that this function will never run twice in parallel for
* the same PM domain, so it is not necessary to use locking here.
*
* At this point suspended_count == 0 means we are being run for the
* first time for the given domain in the present cycle.
*/
genpd_lock(genpd);
if (genpd->suspended_count++ == 0)
/*
* The boot kernel might put the domain into arbitrary state,
* so make it appear as powered off to genpd_sync_poweron(),
* so make it appear as powered off to genpd_sync_power_on(),
* so that it tries to power it on in case it was really off.
*/
genpd->status = GPD_STATE_POWER_OFF;
genpd_sync_poweron(genpd);
genpd_sync_power_on(genpd, true, 0);
genpd_unlock(genpd);
if (genpd->dev_ops.stop && genpd->dev_ops.start)
ret = pm_runtime_force_resume(dev);
@ -1072,9 +1082,9 @@ static void genpd_syscore_switch(struct device *dev, bool suspend)
if (suspend) {
genpd->suspended_count++;
genpd_sync_poweroff(genpd);
genpd_sync_power_off(genpd, false, 0);
} else {
genpd_sync_poweron(genpd);
genpd_sync_power_on(genpd, false, 0);
genpd->suspended_count--;
}
}
@ -2043,7 +2053,7 @@ int genpd_dev_pm_attach(struct device *dev)
dev->pm_domain->sync = genpd_dev_pm_sync;
genpd_lock(pd);
ret = genpd_poweron(pd, 0);
ret = genpd_power_on(pd, 0);
genpd_unlock(pd);
out:
return ret ? -EPROBE_DEFER : 0;

1021
drivers/base/power/opp/core.c
View File

File diff suppressed because it is too large Load Diff

66
drivers/base/power/opp/cpu.c
View File

@ -42,11 +42,6 @@
*
* WARNING: It is important for the callers to ensure refreshing their copy of
* the table if any of the mentioned functions have been invoked in the interim.
*
* Locking: The internal opp_table and opp structures are RCU protected.
* Since we just use the regular accessor functions to access the internal data
* structures, we use RCU read lock inside this function. As a result, users of
* this function DONOT need to use explicit locks for invoking.
*/
int dev_pm_opp_init_cpufreq_table(struct device *dev,
struct cpufreq_frequency_table **table)
@ -56,19 +51,13 @@ int dev_pm_opp_init_cpufreq_table(struct device *dev,
int i, max_opps, ret = 0;
unsigned long rate;
rcu_read_lock();
max_opps = dev_pm_opp_get_opp_count(dev);
if (max_opps <= 0) {
ret = max_opps ? max_opps : -ENODATA;
goto out;
}
if (max_opps <= 0)
return max_opps ? max_opps : -ENODATA;
freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_ATOMIC);
if (!freq_table) {
ret = -ENOMEM;
goto out;
}
if (!freq_table)
return -ENOMEM;
for (i = 0, rate = 0; i < max_opps; i++, rate++) {
/* find next rate */
@ -83,6 +72,8 @@ int dev_pm_opp_init_cpufreq_table(struct device *dev,
/* Is Boost/turbo opp ? */
if (dev_pm_opp_is_turbo(opp))
freq_table[i].flags = CPUFREQ_BOOST_FREQ;
dev_pm_opp_put(opp);
}
freq_table[i].driver_data = i;
@ -91,7 +82,6 @@ int dev_pm_opp_init_cpufreq_table(struct device *dev,
*table = &freq_table[0];
out:
rcu_read_unlock();
if (ret)
kfree(freq_table);
@ -147,12 +137,6 @@ void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of)
* This removes the OPP tables for CPUs present in the @cpumask.
* This should be used to remove all the OPPs entries associated with
* the cpus in @cpumask.
*
* Locking: The internal opp_table and opp structures are RCU protected.
* Hence this function internally uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
*/
void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask)
{
@ -169,12 +153,6 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_cpumask_remove_table);
* @cpumask.
*
* Returns -ENODEV if OPP table isn't already present.
*
* Locking: The internal opp_table and opp structures are RCU protected.
* Hence this function internally uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
*/
int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev,
const struct cpumask *cpumask)
@ -184,13 +162,9 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev,
struct device *dev;
int cpu, ret = 0;
mutex_lock(&opp_table_lock);
opp_table = _find_opp_table(cpu_dev);
if (IS_ERR(opp_table)) {
ret = PTR_ERR(opp_table);
goto unlock;
}
if (IS_ERR(opp_table))
return PTR_ERR(opp_table);
for_each_cpu(cpu, cpumask) {
if (cpu == cpu_dev->id)
@ -213,8 +187,8 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev,
/* Mark opp-table as multiple CPUs are sharing it now */
opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
}
unlock:
mutex_unlock(&opp_table_lock);
dev_pm_opp_put_opp_table(opp_table);
return ret;
}
@ -229,12 +203,6 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus);
*
* Returns -ENODEV if OPP table isn't already present and -EINVAL if the OPP
* table's status is access-unknown.
*
* Locking: The internal opp_table and opp structures are RCU protected.
* Hence this function internally uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
*/
int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
{
@ -242,17 +210,13 @@ int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
struct opp_table *opp_table;
int ret = 0;
mutex_lock(&opp_table_lock);
opp_table = _find_opp_table(cpu_dev);
if (IS_ERR(opp_table)) {
ret = PTR_ERR(opp_table);
goto unlock;
}
if (IS_ERR(opp_table))
return PTR_ERR(opp_table);
if (opp_table->shared_opp == OPP_TABLE_ACCESS_UNKNOWN) {
ret = -EINVAL;
goto unlock;
goto put_opp_table;
}
cpumask_clear(cpumask);
@ -264,8 +228,8 @@ int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
cpumask_set_cpu(cpu_dev->id, cpumask);
}
unlock:
mutex_unlock(&opp_table_lock);
put_opp_table:
dev_pm_opp_put_opp_table(opp_table);
return ret;
}

154
drivers/base/power/opp/of.c
View File

@ -24,9 +24,11 @@
static struct opp_table *_managed_opp(const struct device_node *np)
{
struct opp_table *opp_table;
struct opp_table *opp_table, *managed_table = NULL;
list_for_each_entry_rcu(opp_table, &opp_tables, node) {
mutex_lock(&opp_table_lock);
list_for_each_entry(opp_table, &opp_tables, node) {
if (opp_table->np == np) {
/*
* Multiple devices can point to the same OPP table and
@ -35,14 +37,18 @@ static struct opp_table *_managed_opp(const struct device_node *np)
* But the OPPs will be considered as shared only if the
* OPP table contains a "opp-shared" property.
*/
if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED)
return opp_table;
if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {
_get_opp_table_kref(opp_table);
managed_table = opp_table;
}
return NULL;
break;
}
}
return NULL;
mutex_unlock(&opp_table_lock);
return managed_table;
}
void _of_init_opp_table(struct opp_table *opp_table, struct device *dev)
@ -229,34 +235,28 @@ free_microvolt:
* @dev: device pointer used to lookup OPP table.
*
* Free OPPs created using static entries present in DT.
*
* Locking: The internal opp_table and opp structures are RCU protected.
* Hence this function indirectly uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
*/
void dev_pm_opp_of_remove_table(struct device *dev)
{
_dev_pm_opp_remove_table(dev, false);
_dev_pm_opp_find_and_remove_table(dev, false);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
/* Returns opp descriptor node for a device, caller must do of_node_put() */
static struct device_node *_of_get_opp_desc_node(struct device *dev)
struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
{
/*
* TODO: Support for multiple OPP tables.
*
* There should be only ONE phandle present in "operating-points-v2"
* property.
*/
return of_parse_phandle(dev->of_node, "operating-points-v2", 0);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node);
/**
* _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
* @opp_table: OPP table
* @dev: device for which we do this operation
* @np: device node
*
@ -264,12 +264,6 @@ static struct device_node *_of_get_opp_desc_node(struct device *dev)
* opp can be controlled using dev_pm_opp_enable/disable functions and may be
* removed by dev_pm_opp_remove.
*
* Locking: The internal opp_table and opp structures are RCU protected.
* Hence this function internally uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
*
* Return:
* 0 On success OR
* Duplicate OPPs (both freq and volt are same) and opp->available
@ -278,22 +272,17 @@ static struct device_node *_of_get_opp_desc_node(struct device *dev)
* -ENOMEM Memory allocation failure
* -EINVAL Failed parsing the OPP node
*/
static int _opp_add_static_v2(struct device *dev, struct device_node *np)
static int _opp_add_static_v2(struct opp_table *opp_table, struct device *dev,
struct device_node *np)
{
struct opp_table *opp_table;
struct dev_pm_opp *new_opp;
u64 rate;
u32 val;
int ret;
/* Hold our table modification lock here */
mutex_lock(&opp_table_lock);
new_opp = _allocate_opp(dev, &opp_table);
if (!new_opp) {
ret = -ENOMEM;
goto unlock;
}
new_opp = _opp_allocate(opp_table);
if (!new_opp)
return -ENOMEM;
ret = of_property_read_u64(np, "opp-hz", &rate);
if (ret < 0) {
@ -327,8 +316,12 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
goto free_opp;
ret = _opp_add(dev, new_opp, opp_table);
if (ret)
if (ret) {
/* Don't return error for duplicate OPPs */
if (ret == -EBUSY)
ret = 0;
goto free_opp;
}
/* OPP to select on device suspend */
if (of_property_read_bool(np, "opp-suspend")) {
@ -345,8 +338,6 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max)
opp_table->clock_latency_ns_max = new_opp->clock_latency_ns;
mutex_unlock(&opp_table_lock);
pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n",
__func__, new_opp->turbo, new_opp->rate,
new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min,
@ -356,13 +347,12 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
* Notify the changes in the availability of the operable
* frequency/voltage list.
*/
srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADD, new_opp);
blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
return 0;
free_opp:
_opp_remove(opp_table, new_opp, false);
unlock:
mutex_unlock(&opp_table_lock);
_opp_free(new_opp);
return ret;
}
@ -373,41 +363,35 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
struct opp_table *opp_table;
int ret = 0, count = 0;
mutex_lock(&opp_table_lock);
opp_table = _managed_opp(opp_np);
if (opp_table) {
/* OPPs are already managed */
if (!_add_opp_dev(dev, opp_table))
ret = -ENOMEM;
mutex_unlock(&opp_table_lock);
return ret;
goto put_opp_table;
}
mutex_unlock(&opp_table_lock);
opp_table = dev_pm_opp_get_opp_table(dev);
if (!opp_table)
return -ENOMEM;
/* We have opp-table node now, iterate over it and add OPPs */
for_each_available_child_of_node(opp_np, np) {
count++;
ret = _opp_add_static_v2(dev, np);
ret = _opp_add_static_v2(opp_table, dev, np);
if (ret) {
dev_err(dev, "%s: Failed to add OPP, %d\n", __func__,
ret);
goto free_table;
_dev_pm_opp_remove_table(opp_table, dev, false);
goto put_opp_table;
}
}
/* There should be one of more OPP defined */
if (WARN_ON(!count))
return -ENOENT;
mutex_lock(&opp_table_lock);
opp_table = _find_opp_table(dev);
if (WARN_ON(IS_ERR(opp_table))) {
ret = PTR_ERR(opp_table);
mutex_unlock(&opp_table_lock);
goto free_table;
if (WARN_ON(!count)) {
ret = -ENOENT;
goto put_opp_table;
}
opp_table->np = opp_np;
@ -416,12 +400,8 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
else
opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE;
mutex_unlock(&opp_table_lock);
return 0;
free_table:
dev_pm_opp_of_remove_table(dev);
put_opp_table:
dev_pm_opp_put_opp_table(opp_table);
return ret;
}
@ -429,9 +409,10 @@ free_table:
/* Initializes OPP tables based on old-deprecated bindings */
static int _of_add_opp_table_v1(struct device *dev)
{
struct opp_table *opp_table;
const struct property *prop;
const __be32 *val;
int nr;
int nr, ret = 0;
prop = of_find_property(dev->of_node, "operating-points", NULL);
if (!prop)
@ -449,18 +430,27 @@ static int _of_add_opp_table_v1(struct device *dev)
return -EINVAL;
}
opp_table = dev_pm_opp_get_opp_table(dev);
if (!opp_table)
return -ENOMEM;
val = prop->value;
while (nr) {
unsigned long freq = be32_to_cpup(val++) * 1000;
unsigned long volt = be32_to_cpup(val++);
if (_opp_add_v1(dev, freq, volt, false))
dev_warn(dev, "%s: Failed to add OPP %ld\n",
__func__, freq);
ret = _opp_add_v1(opp_table, dev, freq, volt, false);
if (ret) {
dev_err(dev, "%s: Failed to add OPP %ld (%d)\n",
__func__, freq, ret);
_dev_pm_opp_remove_table(opp_table, dev, false);
break;
}
nr -= 2;
}
return 0;
dev_pm_opp_put_opp_table(opp_table);
return ret;
}
/**
@ -469,12 +459,6 @@ static int _of_add_opp_table_v1(struct device *dev)
*
* Register the initial OPP table with the OPP library for given device.
*
* Locking: The internal opp_table and opp structures are RCU protected.
* Hence this function indirectly uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
*
* Return:
* 0 On success OR
* Duplicate OPPs (both freq and volt are same) and opp->available
@ -495,7 +479,7 @@ int dev_pm_opp_of_add_table(struct device *dev)
* OPPs have two version of bindings now. The older one is deprecated,
* try for the new binding first.
*/
opp_np = _of_get_opp_desc_node(dev);
opp_np = dev_pm_opp_of_get_opp_desc_node(dev);
if (!opp_np) {
/*
* Try old-deprecated bindings for backward compatibility with
@ -519,12 +503,6 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
*
* This removes the OPP tables for CPUs present in the @cpumask.
* This should be used only to remove static entries created from DT.
*
* Locking: The internal opp_table and opp structures are RCU protected.
* Hence this function internally uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
*/
void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask)
{
@ -537,12 +515,6 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table);
* @cpumask: cpumask for which OPP table needs to be added.
*
* This adds the OPP tables for CPUs present in the @cpumask.
*
* Locking: The internal opp_table and opp structures are RCU protected.
* Hence this function internally uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
*/
int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask)
{
@ -590,12 +562,6 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table);
* This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
*
* Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev.
*
* Locking: The internal opp_table and opp structures are RCU protected.
* Hence this function internally uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
*/
int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
struct cpumask *cpumask)
@ -605,7 +571,7 @@ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
int cpu, ret = 0;
/* Get OPP descriptor node */
np = _of_get_opp_desc_node(cpu_dev);
np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
if (!np) {
dev_dbg(cpu_dev, "%s: Couldn't find opp node.\n", __func__);
return -ENOENT;
@ -630,7 +596,7 @@ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
}
/* Get OPP descriptor node */
tmp_np = _of_get_opp_desc_node(tcpu_dev);
tmp_np = dev_pm_opp_of_get_opp_desc_node(tcpu_dev);
if (!tmp_np) {
dev_err(tcpu_dev, "%s: Couldn't find opp node.\n",
__func__);

40
drivers/base/power/opp/opp.h
View File

@ -16,11 +16,11 @@
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/limits.h>
#include <linux/pm_opp.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/notifier.h>
struct clk;
struct regulator;
@ -51,11 +51,9 @@ extern struct list_head opp_tables;
* @node: opp table node. The nodes are maintained throughout the lifetime
* of boot. It is expected only an optimal set of OPPs are
* added to the library by the SoC framework.
* RCU usage: opp table is traversed with RCU locks. node
* modification is possible realtime, hence the modifications
* are protected by the opp_table_lock for integrity.
* IMPORTANT: the opp nodes should be maintained in increasing
* order.
* @kref: for reference count of the OPP.
* @available: true/false - marks if this OPP as available or not
* @dynamic: not-created from static DT entries.
* @turbo: true if turbo (boost) OPP
@ -65,7 +63,6 @@ extern struct list_head opp_tables;
* @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
* frequency from any other OPP's frequency.
* @opp_table: points back to the opp_table struct this opp belongs to
* @rcu_head: RCU callback head used for deferred freeing
* @np: OPP's device node.
* @dentry: debugfs dentry pointer (per opp)
*
@ -73,6 +70,7 @@ extern struct list_head opp_tables;
*/
struct dev_pm_opp {
struct list_head node;
struct kref kref;
bool available;
bool dynamic;
@ -85,7 +83,6 @@ struct dev_pm_opp {
unsigned long clock_latency_ns;
struct opp_table *opp_table;
struct rcu_head rcu_head;
struct device_node *np;
@ -98,7 +95,6 @@ struct dev_pm_opp {
* struct opp_device - devices managed by 'struct opp_table'
* @node: list node
* @dev: device to which the struct object belongs
* @rcu_head: RCU callback head used for deferred freeing
* @dentry: debugfs dentry pointer (per device)
*
* This is an internal data structure maintaining the devices that are managed
@ -107,7 +103,6 @@ struct dev_pm_opp {
struct opp_device {
struct list_head node;
const struct device *dev;
struct rcu_head rcu_head;
#ifdef CONFIG_DEBUG_FS
struct dentry *dentry;
@ -125,12 +120,11 @@ enum opp_table_access {
* @node: table node - contains the devices with OPPs that
* have been registered. Nodes once added are not modified in this
* table.
* RCU usage: nodes are not modified in the table of opp_table,
* however addition is possible and is secured by opp_table_lock
* @srcu_head: notifier head to notify the OPP availability changes.
* @rcu_head: RCU callback head used for deferred freeing
* @head: notifier head to notify the OPP availability changes.
* @dev_list: list of devices that share these OPPs
* @opp_list: table of opps
* @kref: for reference count of the table.
* @lock: mutex protecting the opp_list.
* @np: struct device_node pointer for opp's DT node.
* @clock_latency_ns_max: Max clock latency in nanoseconds.
* @shared_opp: OPP is shared between multiple devices.
@ -151,18 +145,15 @@ enum opp_table_access {
* This is an internal data structure maintaining the link to opps attached to
* a device. This structure is not meant to be shared to users as it is
* meant for book keeping and private to OPP library.
*
* Because the opp structures can be used from both rcu and srcu readers, we
* need to wait for the grace period of both of them before freeing any
* resources. And so we have used kfree_rcu() from within call_srcu() handlers.
*/
struct opp_table {
struct list_head node;
struct srcu_notifier_head srcu_head;
struct rcu_head rcu_head;
struct blocking_notifier_head head;
struct list_head dev_list;
struct list_head opp_list;
struct kref kref;
struct mutex lock;
struct device_node *np;
unsigned long clock_latency_ns_max;
@ -190,14 +181,17 @@ struct opp_table {
};
/* Routines internal to opp core */
void _get_opp_table_kref(struct opp_table *opp_table);
struct opp_table *_find_opp_table(struct device *dev);
struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table);
void _dev_pm_opp_remove_table(struct device *dev, bool remove_all);
struct dev_pm_opp *_allocate_opp(struct device *dev, struct opp_table **opp_table);
void _dev_pm_opp_remove_table(struct opp_table *opp_table, struct device *dev, bool remove_all);
void _dev_pm_opp_find_and_remove_table(struct device *dev, bool remove_all);
struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table);
void _opp_free(struct dev_pm_opp *opp);
int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table);
void _opp_remove(struct opp_table *opp_table, struct dev_pm_opp *opp, bool notify);
int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt, bool dynamic);
int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic);
void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of);
struct opp_table *_add_opp_table(struct device *dev);
#ifdef CONFIG_OF
void _of_init_opp_table(struct opp_table *opp_table, struct device *dev);

2
drivers/base/power/qos.c
View File

@ -281,7 +281,7 @@ void dev_pm_qos_constraints_destroy(struct device *dev)
dev->power.qos = ERR_PTR(-ENODEV);
spin_unlock_irq(&dev->power.lock);
kfree(c->notifiers);
kfree(qos->resume_latency.notifiers);
kfree(qos);
out:

22
drivers/base/power/wakeirq.c
View File

@ -141,6 +141,13 @@ static irqreturn_t handle_threaded_wake_irq(int irq, void *_wirq)
struct wake_irq *wirq = _wirq;
int res;
/* Maybe abort suspend? */
if (irqd_is_wakeup_set(irq_get_irq_data(irq))) {
pm_wakeup_event(wirq->dev, 0);
return IRQ_HANDLED;
}
/* We don't want RPM_ASYNC or RPM_NOWAIT here */
res = pm_runtime_resume(wirq->dev);
if (res < 0)
@ -183,6 +190,9 @@ int dev_pm_set_dedicated_wake_irq(struct device *dev, int irq)
wirq->irq = irq;
irq_set_status_flags(irq, IRQ_NOAUTOEN);
/* Prevent deferred spurious wakeirqs with disable_irq_nosync() */
irq_set_status_flags(irq, IRQ_DISABLE_UNLAZY);
/*
* Consumer device may need to power up and restore state
* so we use a threaded irq.
@ -312,8 +322,12 @@ void dev_pm_arm_wake_irq(struct wake_irq *wirq)
if (!wirq)
return;
if (device_may_wakeup(wirq->dev))
if (device_may_wakeup(wirq->dev)) {
if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED)
enable_irq(wirq->irq);
enable_irq_wake(wirq->irq);
}
}
/**
@ -328,6 +342,10 @@ void dev_pm_disarm_wake_irq(struct wake_irq *wirq)
if (!wirq)
return;
if (device_may_wakeup(wirq->dev))
if (device_may_wakeup(wirq->dev)) {
disable_irq_wake(wirq->irq);
if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED)
disable_irq_nosync(wirq->irq);
}
}

17
drivers/clk/tegra/clk-dfll.c
View File

@ -633,16 +633,12 @@ static int find_lut_index_for_rate(struct tegra_dfll *td, unsigned long rate)
struct dev_pm_opp *opp;
int i, uv;
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(td->soc->dev, &rate);
if (IS_ERR(opp)) {
rcu_read_unlock();
if (IS_ERR(opp))
return PTR_ERR(opp);
}
uv = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
uv = dev_pm_opp_get_voltage(opp);
dev_pm_opp_put(opp);
for (i = 0; i < td->i2c_lut_size; i++) {
if (regulator_list_voltage(td->vdd_reg, td->i2c_lut[i]) == uv)
@ -1440,8 +1436,6 @@ static int dfll_build_i2c_lut(struct tegra_dfll *td)
struct dev_pm_opp *opp;
int lut;
rcu_read_lock();
rate = ULONG_MAX;
opp = dev_pm_opp_find_freq_floor(td->soc->dev, &rate);
if (IS_ERR(opp)) {
@ -1449,6 +1443,7 @@ static int dfll_build_i2c_lut(struct tegra_dfll *td)
goto out;
}
v_max = dev_pm_opp_get_voltage(opp);
dev_pm_opp_put(opp);
v = td->soc->cvb->min_millivolts * 1000;
lut = find_vdd_map_entry_exact(td, v);
@ -1465,6 +1460,8 @@ static int dfll_build_i2c_lut(struct tegra_dfll *td)
if (v_opp <= td->soc->cvb->min_millivolts * 1000)
td->dvco_rate_min = dev_pm_opp_get_freq(opp);
dev_pm_opp_put(opp);
for (;;) {
v += max(1, (v_max - v) / (MAX_DFLL_VOLTAGES - j));
if (v >= v_opp)
@ -1496,8 +1493,6 @@ static int dfll_build_i2c_lut(struct tegra_dfll *td)
ret = 0;
out:
rcu_read_unlock();
return ret;
}

20
drivers/cpufreq/Kconfig
View File

@ -37,14 +37,6 @@ config CPU_FREQ_STAT
If in doubt, say N.
config CPU_FREQ_STAT_DETAILS
bool "CPU frequency transition statistics details"
depends on CPU_FREQ_STAT
help
Show detailed CPU frequency transition table in sysfs.
If in doubt, say N.
choice
prompt "Default CPUFreq governor"
default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ
@ -271,6 +263,16 @@ config IA64_ACPI_CPUFREQ
endif
if MIPS
config BMIPS_CPUFREQ
tristate "BMIPS CPUfreq Driver"
help
This option adds a CPUfreq driver for BMIPS processors with
support for configurable CPU frequency.
For now, BMIPS5 chips are supported (such as the Broadcom 7425).
If in doubt, say N.
config LOONGSON2_CPUFREQ
tristate "Loongson2 CPUFreq Driver"
help
@ -332,7 +334,7 @@ endif
config QORIQ_CPUFREQ
tristate "CPU frequency scaling driver for Freescale QorIQ SoCs"
depends on OF && COMMON_CLK && (PPC_E500MC || ARM)
depends on OF && COMMON_CLK && (PPC_E500MC || ARM || ARM64)
depends on !CPU_THERMAL || THERMAL
select CLK_QORIQ
help

13
drivers/cpufreq/Kconfig.arm
View File

@ -247,6 +247,17 @@ config ARM_TEGRA124_CPUFREQ
help
This adds the CPUFreq driver support for Tegra124 SOCs.
config ARM_TI_CPUFREQ
bool "Texas Instruments CPUFreq support"
depends on ARCH_OMAP2PLUS
help
This driver enables valid OPPs on the running platform based on
values contained within the SoC in use. Enable this in order to
use the cpufreq-dt driver on all Texas Instruments platforms that
provide dt based operating-points-v2 tables with opp-supported-hw
data provided. Required for cpufreq support on AM335x, AM437x,
DRA7x, and AM57x platforms.
config ARM_PXA2xx_CPUFREQ
tristate "Intel PXA2xx CPUfreq driver"
depends on PXA27x || PXA25x
@ -257,7 +268,7 @@ config ARM_PXA2xx_CPUFREQ
config ACPI_CPPC_CPUFREQ
tristate "CPUFreq driver based on the ACPI CPPC spec"
depends on ACPI
depends on ACPI_PROCESSOR
select ACPI_CPPC_LIB
default n
help

2
drivers/cpufreq/Makefile
View File

@ -77,6 +77,7 @@ obj-$(CONFIG_ARM_SPEAR_CPUFREQ) += spear-cpufreq.o
obj-$(CONFIG_ARM_STI_CPUFREQ) += sti-cpufreq.o
obj-$(CONFIG_ARM_TEGRA20_CPUFREQ) += tegra20-cpufreq.o
obj-$(CONFIG_ARM_TEGRA124_CPUFREQ) += tegra124-cpufreq.o
obj-$(CONFIG_ARM_TI_CPUFREQ) += ti-cpufreq.o
obj-$(CONFIG_ARM_VEXPRESS_SPC_CPUFREQ) += vexpress-spc-cpufreq.o
obj-$(CONFIG_ACPI_CPPC_CPUFREQ) += cppc_cpufreq.o
obj-$(CONFIG_MACH_MVEBU_V7) += mvebu-cpufreq.o
@ -98,6 +99,7 @@ obj-$(CONFIG_POWERNV_CPUFREQ) += powernv-cpufreq.o
# Other platform drivers
obj-$(CONFIG_AVR32_AT32AP_CPUFREQ) += at32ap-cpufreq.o
obj-$(CONFIG_BFIN_CPU_FREQ) += blackfin-cpufreq.o
obj-$(CONFIG_BMIPS_CPUFREQ) += bmips-cpufreq.o
obj-$(CONFIG_CRIS_MACH_ARTPEC3) += cris-artpec3-cpufreq.o
obj-$(CONFIG_ETRAXFS) += cris-etraxfs-cpufreq.o
obj-$(CONFIG_IA64_ACPI_CPUFREQ) += ia64-acpi-cpufreq.o

188
drivers/cpufreq/bmips-cpufreq.c 100644
View File

@ -0,0 +1,188 @@
/*
* CPU frequency scaling for Broadcom BMIPS SoCs
*
* Copyright (c) 2017 Broadcom
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/cpufreq.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/slab.h>
/* for mips_hpt_frequency */
#include <asm/time.h>
#define BMIPS_CPUFREQ_PREFIX "bmips"
#define BMIPS_CPUFREQ_NAME BMIPS_CPUFREQ_PREFIX "-cpufreq"
#define TRANSITION_LATENCY (25 * 1000) /* 25 us */
#define BMIPS5_CLK_DIV_SET_SHIFT 0x7
#define BMIPS5_CLK_DIV_SHIFT 0x4
#define BMIPS5_CLK_DIV_MASK 0xf
enum bmips_type {
BMIPS5000,
BMIPS5200,
};
struct cpufreq_compat {
const char *compatible;
unsigned int bmips_type;
unsigned int clk_mult;
unsigned int max_freqs;
};
#define BMIPS(c, t, m, f) { \
.compatible = c, \
.bmips_type = (t), \
.clk_mult = (m), \
.max_freqs = (f), \
}
static struct cpufreq_compat bmips_cpufreq_compat[] = {
BMIPS("brcm,bmips5000", BMIPS5000, 8, 4),
BMIPS("brcm,bmips5200", BMIPS5200, 8, 4),
{ }
};
static struct cpufreq_compat *priv;
static int htp_freq_to_cpu_freq(unsigned int clk_mult)
{
return mips_hpt_frequency * clk_mult / 1000;
}
static struct cpufreq_frequency_table *
bmips_cpufreq_get_freq_table(const struct cpufreq_policy *policy)
{
struct cpufreq_frequency_table *table;
unsigned long cpu_freq;
int i;
cpu_freq = htp_freq_to_cpu_freq(priv->clk_mult);
table = kmalloc((priv->max_freqs + 1) * sizeof(*table), GFP_KERNEL);
if (!table)
return ERR_PTR(-ENOMEM);
for (i = 0; i < priv->max_freqs; i++) {
table[i].frequency = cpu_freq / (1 << i);
table[i].driver_data = i;
}
table[i].frequency = CPUFREQ_TABLE_END;
return table;
}
static unsigned int bmips_cpufreq_get(unsigned int cpu)
{
unsigned int div;
uint32_t mode;
switch (priv->bmips_type) {
case BMIPS5200:
case BMIPS5000:
mode = read_c0_brcm_mode();
div = ((mode >> BMIPS5_CLK_DIV_SHIFT) & BMIPS5_CLK_DIV_MASK);
break;
default:
div = 0;
}
return htp_freq_to_cpu_freq(priv->clk_mult) / (1 << div);
}
static int bmips_cpufreq_target_index(struct cpufreq_policy *policy,
unsigned int index)
{
unsigned int div = policy->freq_table[index].driver_data;
switch (priv->bmips_type) {
case BMIPS5200:
case BMIPS5000:
change_c0_brcm_mode(BMIPS5_CLK_DIV_MASK << BMIPS5_CLK_DIV_SHIFT,
(1 << BMIPS5_CLK_DIV_SET_SHIFT) |
(div << BMIPS5_CLK_DIV_SHIFT));
break;
default:
return -ENOTSUPP;
}
return 0;
}
static int bmips_cpufreq_exit(struct cpufreq_policy *policy)
{
kfree(policy->freq_table);
return 0;
}
static int bmips_cpufreq_init(struct cpufreq_policy *policy)
{
struct cpufreq_frequency_table *freq_table;
int ret;
freq_table = bmips_cpufreq_get_freq_table(policy);
if (IS_ERR(freq_table)) {
ret = PTR_ERR(freq_table);
pr_err("%s: couldn't determine frequency table (%d).\n",
BMIPS_CPUFREQ_NAME, ret);
return ret;
}
ret = cpufreq_generic_init(policy, freq_table, TRANSITION_LATENCY);
if (ret)
bmips_cpufreq_exit(policy);
else
pr_info("%s: registered\n", BMIPS_CPUFREQ_NAME);
return ret;
}
static struct cpufreq_driver bmips_cpufreq_driver = {
.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK,
.verify = cpufreq_generic_frequency_table_verify,
.target_index = bmips_cpufreq_target_index,
.get = bmips_cpufreq_get,
.init = bmips_cpufreq_init,
.exit = bmips_cpufreq_exit,
.attr = cpufreq_generic_attr,
.name = BMIPS_CPUFREQ_PREFIX,
};
static int __init bmips_cpufreq_probe(void)
{
struct cpufreq_compat *cc;
struct device_node *np;
for (cc = bmips_cpufreq_compat; cc->compatible; cc++) {
np = of_find_compatible_node(NULL, "cpu", cc->compatible);
if (np) {
of_node_put(np);
priv = cc;
break;
}
}
/* We hit the guard element of the array. No compatible CPU found. */
if (!cc->compatible)
return -ENODEV;
return cpufreq_register_driver(&bmips_cpufreq_driver);
}
device_initcall(bmips_cpufreq_probe);
MODULE_AUTHOR("Markus Mayer <mmayer@broadcom.com>");
MODULE_DESCRIPTION("CPUfreq driver for Broadcom BMIPS SoCs");
MODULE_LICENSE("GPL");

2
drivers/cpufreq/brcmstb-avs-cpufreq.c
View File

@ -878,7 +878,6 @@ unmap_intr_base:
iounmap(priv->avs_intr_base);
unmap_base:
iounmap(priv->base);
platform_set_drvdata(pdev, NULL);
return ret;
}
@ -1042,7 +1041,6 @@ static int brcm_avs_cpufreq_remove(struct platform_device *pdev)
priv = platform_get_drvdata(pdev);
iounmap(priv->base);
iounmap(priv->avs_intr_base);
platform_set_drvdata(pdev, NULL);
return 0;
}

2
drivers/cpufreq/cpufreq-dt-platdev.c
View File

@ -87,8 +87,6 @@ static const struct of_device_id machines[] __initconst = {
{ .compatible = "socionext,uniphier-ld11", },
{ .compatible = "socionext,uniphier-ld20", },
{ .compatible = "ti,am33xx", },
{ .compatible = "ti,dra7", },
{ .compatible = "ti,omap2", },
{ .compatible = "ti,omap3", },
{ .compatible = "ti,omap4", },

7
drivers/cpufreq/cpufreq-dt.c
View File

@ -148,7 +148,6 @@ static int cpufreq_init(struct cpufreq_policy *policy)
struct private_data *priv;
struct device *cpu_dev;
struct clk *cpu_clk;
struct dev_pm_opp *suspend_opp;
unsigned int transition_latency;
bool fallback = false;
const char *name;
@ -252,11 +251,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
policy->driver_data = priv;
policy->clk = cpu_clk;
rcu_read_lock();
suspend_opp = dev_pm_opp_get_suspend_opp(cpu_dev);
if (suspend_opp)
policy->suspend_freq = dev_pm_opp_get_freq(suspend_opp) / 1000;
rcu_read_unlock();
policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
ret = cpufreq_table_validate_and_show(policy, freq_table);
if (ret) {

21
drivers/cpufreq/cpufreq.c
View File

@ -1078,15 +1078,11 @@ err_free_policy:
return NULL;
}
static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy, bool notify)
static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy)
{
struct kobject *kobj;
struct completion *cmp;
if (notify)
blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
CPUFREQ_REMOVE_POLICY, policy);
down_write(&policy->rwsem);
cpufreq_stats_free_table(policy);
kobj = &policy->kobj;
@ -1104,7 +1100,7 @@ static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy, bool notify)
pr_debug("wait complete\n");
}
static void cpufreq_policy_free(struct cpufreq_policy *policy, bool notify)
static void cpufreq_policy_free(struct cpufreq_policy *policy)
{
unsigned long flags;
int cpu;
@ -1117,7 +1113,7 @@ static void cpufreq_policy_free(struct cpufreq_policy *policy, bool notify)
per_cpu(cpufreq_cpu_data, cpu) = NULL;
write_unlock_irqrestore(&cpufreq_driver_lock, flags);
cpufreq_policy_put_kobj(policy, notify);
cpufreq_policy_put_kobj(policy);
free_cpumask_var(policy->real_cpus);
free_cpumask_var(policy->related_cpus);
free_cpumask_var(policy->cpus);
@ -1170,8 +1166,6 @@ static int cpufreq_online(unsigned int cpu)
if (new_policy) {
/* related_cpus should at least include policy->cpus. */
cpumask_copy(policy->related_cpus, policy->cpus);
/* Clear mask of registered CPUs */
cpumask_clear(policy->real_cpus);
}
/*
@ -1244,17 +1238,12 @@ static int cpufreq_online(unsigned int cpu)
goto out_exit_policy;
cpufreq_stats_create_table(policy);
blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
CPUFREQ_CREATE_POLICY, policy);
write_lock_irqsave(&cpufreq_driver_lock, flags);
list_add(&policy->policy_list, &cpufreq_policy_list);
write_unlock_irqrestore(&cpufreq_driver_lock, flags);
}
blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
CPUFREQ_START, policy);
ret = cpufreq_init_policy(policy);
if (ret) {
pr_err("%s: Failed to initialize policy for cpu: %d (%d)\n",
@ -1282,7 +1271,7 @@ out_exit_policy:
if (cpufreq_driver->exit)
cpufreq_driver->exit(policy);
out_free_policy:
cpufreq_policy_free(policy, !new_policy);
cpufreq_policy_free(policy);
return ret;
}
@ -1403,7 +1392,7 @@ static void cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif)
remove_cpu_dev_symlink(policy, dev);
if (cpumask_empty(policy->real_cpus))
cpufreq_policy_free(policy, true);
cpufreq_policy_free(policy);
}
/**

14
drivers/cpufreq/cpufreq_stats.c
View File

@ -24,9 +24,7 @@ struct cpufreq_stats {
unsigned int last_index;
u64 *time_in_state;
unsigned int *freq_table;
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
unsigned int *trans_table;
#endif
};
static int cpufreq_stats_update(struct cpufreq_stats *stats)
@ -45,9 +43,7 @@ static void cpufreq_stats_clear_table(struct cpufreq_stats *stats)
unsigned int count = stats->max_state;
memset(stats->time_in_state, 0, count * sizeof(u64));
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
memset(stats->trans_table, 0, count * count * sizeof(int));
#endif
stats->last_time = get_jiffies_64();
stats->total_trans = 0;
}
@ -83,7 +79,6 @@ static ssize_t store_reset(struct cpufreq_policy *policy, const char *buf,
return count;
}
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
{
struct cpufreq_stats *stats = policy->stats;
@ -128,7 +123,6 @@ static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
return len;
}
cpufreq_freq_attr_ro(trans_table);
#endif
cpufreq_freq_attr_ro(total_trans);
cpufreq_freq_attr_ro(time_in_state);
@ -138,9 +132,7 @@ static struct attribute *default_attrs[] = {
&total_trans.attr,
&time_in_state.attr,
&reset.attr,
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
&trans_table.attr,
#endif
NULL
};
static struct attribute_group stats_attr_group = {
@ -199,9 +191,7 @@ void cpufreq_stats_create_table(struct cpufreq_policy *policy)
alloc_size = count * sizeof(int) + count * sizeof(u64);
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
alloc_size += count * count * sizeof(int);
#endif
/* Allocate memory for time_in_state/freq_table/trans_table in one go */
stats->time_in_state = kzalloc(alloc_size, GFP_KERNEL);
@ -210,9 +200,7 @@ void cpufreq_stats_create_table(struct cpufreq_policy *policy)
stats->freq_table = (unsigned int *)(stats->time_in_state + count);
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
stats->trans_table = stats->freq_table + count;
#endif
stats->max_state = count;
@ -258,8 +246,6 @@ void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
cpufreq_stats_update(stats);
stats->last_index = new_index;
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
stats->trans_table[old_index * stats->max_state + new_index]++;
#endif
stats->total_trans++;
}

5
drivers/cpufreq/exynos5440-cpufreq.c
View File

@ -118,12 +118,10 @@ static int init_div_table(void)
unsigned int tmp, clk_div, ema_div, freq, volt_id;
struct dev_pm_opp *opp;
rcu_read_lock();
cpufreq_for_each_entry(pos, freq_tbl) {
opp = dev_pm_opp_find_freq_exact(dvfs_info->dev,
pos->frequency * 1000, true);
if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(dvfs_info->dev,
"failed to find valid OPP for %u KHZ\n",
pos->frequency);
@ -140,6 +138,7 @@ static int init_div_table(void)
/* Calculate EMA */
volt_id = dev_pm_opp_get_voltage(opp);
volt_id = (MAX_VOLTAGE - volt_id) / VOLTAGE_STEP;
if (volt_id < PMIC_HIGH_VOLT) {
ema_div = (CPUEMA_HIGH << P0_7_CPUEMA_SHIFT) |
@ -157,9 +156,9 @@ static int init_div_table(void)
__raw_writel(tmp, dvfs_info->base + XMU_PMU_P0_7 + 4 *
(pos - freq_tbl));
dev_pm_opp_put(opp);
}
rcu_read_unlock();
return 0;
}

10
drivers/cpufreq/imx6q-cpufreq.c
View File

@ -53,16 +53,15 @@ static int imx6q_set_target(struct cpufreq_policy *policy, unsigned int index)
freq_hz = new_freq * 1000;
old_freq = clk_get_rate(arm_clk) / 1000;
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_hz);
if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(cpu_dev, "failed to find OPP for %ld\n", freq_hz);
return PTR_ERR(opp);
}
volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
volt_old = regulator_get_voltage(arm_reg);
dev_dbg(cpu_dev, "%u MHz, %ld mV --> %u MHz, %ld mV\n",
@ -321,14 +320,15 @@ soc_opp_out:
* freq_table initialised from OPP is therefore sorted in the
* same order.
*/
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(cpu_dev,
freq_table[0].frequency * 1000, true);
min_volt = dev_pm_opp_get_voltage(opp);
dev_pm_opp_put(opp);
opp = dev_pm_opp_find_freq_exact(cpu_dev,
freq_table[--num].frequency * 1000, true);
max_volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
ret = regulator_set_voltage_time(arm_reg, min_volt, max_volt);
if (ret > 0)
transition_latency += ret * 1000;

385
drivers/cpufreq/intel_pstate.c
View File

@ -358,6 +358,8 @@ static struct pstate_funcs pstate_funcs __read_mostly;
static int hwp_active __read_mostly;
static bool per_cpu_limits __read_mostly;
static bool driver_registered __read_mostly;
#ifdef CONFIG_ACPI
static bool acpi_ppc;
#endif
@ -394,6 +396,7 @@ static struct perf_limits *limits = &performance_limits;
static struct perf_limits *limits = &powersave_limits;
#endif
static DEFINE_MUTEX(intel_pstate_driver_lock);
static DEFINE_MUTEX(intel_pstate_limits_lock);
#ifdef CONFIG_ACPI
@ -538,7 +541,6 @@ static void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy)
acpi_processor_unregister_performance(policy->cpu);
}
#else
static inline void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy)
{
@ -873,7 +875,10 @@ static void intel_pstate_hwp_set(struct cpufreq_policy *policy)
rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap);
hw_min = HWP_LOWEST_PERF(cap);
hw_max = HWP_HIGHEST_PERF(cap);
if (limits->no_turbo)
hw_max = HWP_GUARANTEED_PERF(cap);
else
hw_max = HWP_HIGHEST_PERF(cap);
range = hw_max - hw_min;
max_perf_pct = perf_limits->max_perf_pct;
@ -887,11 +892,6 @@ static void intel_pstate_hwp_set(struct cpufreq_policy *policy)
adj_range = max_perf_pct * range / 100;
max = hw_min + adj_range;
if (limits->no_turbo) {
hw_max = HWP_GUARANTEED_PERF(cap);
if (hw_max < max)
max = hw_max;
}
value &= ~HWP_MAX_PERF(~0L);
value |= HWP_MAX_PERF(max);
@ -1007,37 +1007,59 @@ static int pid_param_get(void *data, u64 *val)
}
DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get, pid_param_set, "%llu\n");
static struct dentry *debugfs_parent;
struct pid_param {
char *name;
void *value;
struct dentry *dentry;
};
static struct pid_param pid_files[] = {
{"sample_rate_ms", &pid_params.sample_rate_ms},
{"d_gain_pct", &pid_params.d_gain_pct},
{"i_gain_pct", &pid_params.i_gain_pct},
{"deadband", &pid_params.deadband},
{"setpoint", &pid_params.setpoint},
{"p_gain_pct", &pid_params.p_gain_pct},
{NULL, NULL}
{"sample_rate_ms", &pid_params.sample_rate_ms, },
{"d_gain_pct", &pid_params.d_gain_pct, },
{"i_gain_pct", &pid_params.i_gain_pct, },
{"deadband", &pid_params.deadband, },
{"setpoint", &pid_params.setpoint, },
{"p_gain_pct", &pid_params.p_gain_pct, },
{NULL, NULL, }
};
static void __init intel_pstate_debug_expose_params(void)
static void intel_pstate_debug_expose_params(void)
{
struct dentry *debugfs_parent;
int i = 0;
int i;
debugfs_parent = debugfs_create_dir("pstate_snb", NULL);
if (IS_ERR_OR_NULL(debugfs_parent))
return;
while (pid_files[i].name) {
debugfs_create_file(pid_files[i].name, 0660,
debugfs_parent, pid_files[i].value,
&fops_pid_param);
i++;
for (i = 0; pid_files[i].name; i++) {
struct dentry *dentry;
dentry = debugfs_create_file(pid_files[i].name, 0660,
debugfs_parent, pid_files[i].value,
&fops_pid_param);
if (!IS_ERR(dentry))
pid_files[i].dentry = dentry;
}
}
static void intel_pstate_debug_hide_params(void)
{
int i;
if (IS_ERR_OR_NULL(debugfs_parent))
return;
for (i = 0; pid_files[i].name; i++) {
debugfs_remove(pid_files[i].dentry);
pid_files[i].dentry = NULL;
}
debugfs_remove(debugfs_parent);
debugfs_parent = NULL;
}
/************************** debugfs end ************************/
/************************** sysfs begin ************************/
@ -1048,6 +1070,34 @@ static void __init intel_pstate_debug_expose_params(void)
return sprintf(buf, "%u\n", limits->object); \
}
static ssize_t intel_pstate_show_status(char *buf);
static int intel_pstate_update_status(const char *buf, size_t size);
static ssize_t show_status(struct kobject *kobj,
struct attribute *attr, char *buf)
{
ssize_t ret;
mutex_lock(&intel_pstate_driver_lock);
ret = intel_pstate_show_status(buf);
mutex_unlock(&intel_pstate_driver_lock);
return ret;
}
static ssize_t store_status(struct kobject *a, struct attribute *b,
const char *buf, size_t count)
{
char *p = memchr(buf, '\n', count);
int ret;
mutex_lock(&intel_pstate_driver_lock);
ret = intel_pstate_update_status(buf, p ? p - buf : count);
mutex_unlock(&intel_pstate_driver_lock);
return ret < 0 ? ret : count;
}
static ssize_t show_turbo_pct(struct kobject *kobj,
struct attribute *attr, char *buf)
{
@ -1055,12 +1105,22 @@ static ssize_t show_turbo_pct(struct kobject *kobj,
int total, no_turbo, turbo_pct;
uint32_t turbo_fp;
mutex_lock(&intel_pstate_driver_lock);
if (!driver_registered) {
mutex_unlock(&intel_pstate_driver_lock);
return -EAGAIN;
}
cpu = all_cpu_data[0];
total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1;
turbo_fp = div_fp(no_turbo, total);
turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100)));
mutex_unlock(&intel_pstate_driver_lock);
return sprintf(buf, "%u\n", turbo_pct);
}
@ -1070,8 +1130,18 @@ static ssize_t show_num_pstates(struct kobject *kobj,
struct cpudata *cpu;
int total;
mutex_lock(&intel_pstate_driver_lock);
if (!driver_registered) {
mutex_unlock(&intel_pstate_driver_lock);
return -EAGAIN;
}
cpu = all_cpu_data[0];
total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
mutex_unlock(&intel_pstate_driver_lock);
return sprintf(buf, "%u\n", total);
}
@ -1080,12 +1150,21 @@ static ssize_t show_no_turbo(struct kobject *kobj,
{
ssize_t ret;
mutex_lock(&intel_pstate_driver_lock);
if (!driver_registered) {
mutex_unlock(&intel_pstate_driver_lock);
return -EAGAIN;
}
update_turbo_state();
if (limits->turbo_disabled)
ret = sprintf(buf, "%u\n", limits->turbo_disabled);
else
ret = sprintf(buf, "%u\n", limits->no_turbo);
mutex_unlock(&intel_pstate_driver_lock);
return ret;
}
@ -1099,12 +1178,20 @@ static ssize_t store_no_turbo(struct kobject *a, struct attribute *b,
if (ret != 1)
return -EINVAL;
mutex_lock(&intel_pstate_driver_lock);
if (!driver_registered) {
mutex_unlock(&intel_pstate_driver_lock);
return -EAGAIN;
}
mutex_lock(&intel_pstate_limits_lock);
update_turbo_state();
if (limits->turbo_disabled) {
pr_warn("Turbo disabled by BIOS or unavailable on processor\n");
mutex_unlock(&intel_pstate_limits_lock);
mutex_unlock(&intel_pstate_driver_lock);
return -EPERM;
}
@ -1114,6 +1201,8 @@ static ssize_t store_no_turbo(struct kobject *a, struct attribute *b,
intel_pstate_update_policies();
mutex_unlock(&intel_pstate_driver_lock);
return count;
}
@ -1127,6 +1216,13 @@ static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b,
if (ret != 1)
return -EINVAL;
mutex_lock(&intel_pstate_driver_lock);
if (!driver_registered) {
mutex_unlock(&intel_pstate_driver_lock);
return -EAGAIN;
}
mutex_lock(&intel_pstate_limits_lock);
limits->max_sysfs_pct = clamp_t(int, input, 0 , 100);
@ -1142,6 +1238,8 @@ static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b,
intel_pstate_update_policies();
mutex_unlock(&intel_pstate_driver_lock);
return count;
}
@ -1155,6 +1253,13 @@ static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b,
if (ret != 1)
return -EINVAL;
mutex_lock(&intel_pstate_driver_lock);
if (!driver_registered) {
mutex_unlock(&intel_pstate_driver_lock);
return -EAGAIN;
}
mutex_lock(&intel_pstate_limits_lock);
limits->min_sysfs_pct = clamp_t(int, input, 0 , 100);
@ -1170,12 +1275,15 @@ static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b,
intel_pstate_update_policies();
mutex_unlock(&intel_pstate_driver_lock);
return count;
}
show_one(max_perf_pct, max_perf_pct);
show_one(min_perf_pct, min_perf_pct);
define_one_global_rw(status);
define_one_global_rw(no_turbo);
define_one_global_rw(max_perf_pct);
define_one_global_rw(min_perf_pct);
@ -1183,6 +1291,7 @@ define_one_global_ro(turbo_pct);
define_one_global_ro(num_pstates);
static struct attribute *intel_pstate_attributes[] = {
&status.attr,
&no_turbo.attr,
&turbo_pct.attr,
&num_pstates.attr,
@ -1364,48 +1473,71 @@ static int core_get_max_pstate_physical(void)
return (value >> 8) & 0xFF;
}
static int core_get_tdp_ratio(u64 plat_info)
{
/* Check how many TDP levels present */
if (plat_info & 0x600000000) {
u64 tdp_ctrl;
u64 tdp_ratio;
int tdp_msr;
int err;
/* Get the TDP level (0, 1, 2) to get ratios */
err = rdmsrl_safe(MSR_CONFIG_TDP_CONTROL, &tdp_ctrl);
if (err)
return err;
/* TDP MSR are continuous starting at 0x648 */
tdp_msr = MSR_CONFIG_TDP_NOMINAL + (tdp_ctrl & 0x03);
err = rdmsrl_safe(tdp_msr, &tdp_ratio);
if (err)
return err;
/* For level 1 and 2, bits[23:16] contain the ratio */
if (tdp_ctrl & 0x03)
tdp_ratio >>= 16;
tdp_ratio &= 0xff; /* ratios are only 8 bits long */
pr_debug("tdp_ratio %x\n", (int)tdp_ratio);
return (int)tdp_ratio;
}
return -ENXIO;
}
static int core_get_max_pstate(void)
{
u64 tar;
u64 plat_info;
int max_pstate;
int tdp_ratio;
int err;
rdmsrl(MSR_PLATFORM_INFO, plat_info);
max_pstate = (plat_info >> 8) & 0xFF;
tdp_ratio = core_get_tdp_ratio(plat_info);
if (tdp_ratio <= 0)
return max_pstate;
if (hwp_active) {
/* Turbo activation ratio is not used on HWP platforms */
return tdp_ratio;
}
err = rdmsrl_safe(MSR_TURBO_ACTIVATION_RATIO, &tar);
if (!err) {
int tar_levels;
/* Do some sanity checking for safety */
if (plat_info & 0x600000000) {
u64 tdp_ctrl;
u64 tdp_ratio;
int tdp_msr;
err = rdmsrl_safe(MSR_CONFIG_TDP_CONTROL, &tdp_ctrl);
if (err)
goto skip_tar;
tdp_msr = MSR_CONFIG_TDP_NOMINAL + (tdp_ctrl & 0x3);
err = rdmsrl_safe(tdp_msr, &tdp_ratio);
if (err)
goto skip_tar;
/* For level 1 and 2, bits[23:16] contain the ratio */
if (tdp_ctrl)
tdp_ratio >>= 16;
tdp_ratio &= 0xff; /* ratios are only 8 bits long */
if (tdp_ratio - 1 == tar) {
max_pstate = tar;
pr_debug("max_pstate=TAC %x\n", max_pstate);
} else {
goto skip_tar;
}
tar_levels = tar & 0xff;
if (tdp_ratio - 1 == tar_levels) {
max_pstate = tar_levels;
pr_debug("max_pstate=TAC %x\n", max_pstate);
}
}
skip_tar:
return max_pstate;
}
@ -2072,6 +2204,20 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy)
static int intel_pstate_verify_policy(struct cpufreq_policy *policy)
{
struct cpudata *cpu = all_cpu_data[policy->cpu];
struct perf_limits *perf_limits;
if (policy->policy == CPUFREQ_POLICY_PERFORMANCE)
perf_limits = &performance_limits;
else
perf_limits = &powersave_limits;
update_turbo_state();
policy->cpuinfo.max_freq = perf_limits->turbo_disabled ||
perf_limits->no_turbo ?
cpu->pstate.max_freq :
cpu->pstate.turbo_freq;
cpufreq_verify_within_cpu_limits(policy);
if (policy->policy != CPUFREQ_POLICY_POWERSAVE &&
@ -2299,6 +2445,111 @@ static struct cpufreq_driver intel_cpufreq = {
static struct cpufreq_driver *intel_pstate_driver = &intel_pstate;
static void intel_pstate_driver_cleanup(void)
{
unsigned int cpu;
get_online_cpus();
for_each_online_cpu(cpu) {
if (all_cpu_data[cpu]) {
if (intel_pstate_driver == &intel_pstate)
intel_pstate_clear_update_util_hook(cpu);
kfree(all_cpu_data[cpu]);
all_cpu_data[cpu] = NULL;
}
}
put_online_cpus();
}
static int intel_pstate_register_driver(void)
{
int ret;
ret = cpufreq_register_driver(intel_pstate_driver);
if (ret) {
intel_pstate_driver_cleanup();
return ret;
}
mutex_lock(&intel_pstate_limits_lock);
driver_registered = true;
mutex_unlock(&intel_pstate_limits_lock);
if (intel_pstate_driver == &intel_pstate && !hwp_active &&
pstate_funcs.get_target_pstate != get_target_pstate_use_cpu_load)
intel_pstate_debug_expose_params();
return 0;
}
static int intel_pstate_unregister_driver(void)
{
if (hwp_active)
return -EBUSY;
if (intel_pstate_driver == &intel_pstate && !hwp_active &&
pstate_funcs.get_target_pstate != get_target_pstate_use_cpu_load)
intel_pstate_debug_hide_params();
mutex_lock(&intel_pstate_limits_lock);
driver_registered = false;
mutex_unlock(&intel_pstate_limits_lock);
cpufreq_unregister_driver(intel_pstate_driver);
intel_pstate_driver_cleanup();
return 0;
}
static ssize_t intel_pstate_show_status(char *buf)
{
if (!driver_registered)
return sprintf(buf, "off\n");
return sprintf(buf, "%s\n", intel_pstate_driver == &intel_pstate ?
"active" : "passive");
}
static int intel_pstate_update_status(const char *buf, size_t size)
{
int ret;
if (size == 3 && !strncmp(buf, "off", size))
return driver_registered ?
intel_pstate_unregister_driver() : -EINVAL;
if (size == 6 && !strncmp(buf, "active", size)) {
if (driver_registered) {
if (intel_pstate_driver == &intel_pstate)
return 0;
ret = intel_pstate_unregister_driver();
if (ret)
return ret;
}
intel_pstate_driver = &intel_pstate;
return intel_pstate_register_driver();
}
if (size == 7 && !strncmp(buf, "passive", size)) {
if (driver_registered) {
if (intel_pstate_driver != &intel_pstate)
return 0;
ret = intel_pstate_unregister_driver();
if (ret)
return ret;
}
intel_pstate_driver = &intel_cpufreq;
return intel_pstate_register_driver();
}
return -EINVAL;
}
static int no_load __initdata;
static int no_hwp __initdata;
static int hwp_only __initdata;
@ -2486,9 +2737,9 @@ static const struct x86_cpu_id hwp_support_ids[] __initconst = {
static int __init intel_pstate_init(void)
{
int cpu, rc = 0;
const struct x86_cpu_id *id;
struct cpu_defaults *cpu_def;
int rc = 0;
if (no_load)
return -ENODEV;
@ -2520,45 +2771,29 @@ hwp_cpu_matched:
if (intel_pstate_platform_pwr_mgmt_exists())
return -ENODEV;
if (!hwp_active && hwp_only)
return -ENOTSUPP;
pr_info("Intel P-state driver initializing\n");
all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus());
if (!all_cpu_data)
return -ENOMEM;
if (!hwp_active && hwp_only)
goto out;
intel_pstate_request_control_from_smm();
rc = cpufreq_register_driver(intel_pstate_driver);
if (rc)
goto out;
if (intel_pstate_driver == &intel_pstate && !hwp_active &&
pstate_funcs.get_target_pstate != get_target_pstate_use_cpu_load)
intel_pstate_debug_expose_params();
intel_pstate_sysfs_expose_params();
mutex_lock(&intel_pstate_driver_lock);
rc = intel_pstate_register_driver();
mutex_unlock(&intel_pstate_driver_lock);
if (rc)
return rc;
if (hwp_active)
pr_info("HWP enabled\n");
return rc;
out:
get_online_cpus();
for_each_online_cpu(cpu) {
if (all_cpu_data[cpu]) {
if (intel_pstate_driver == &intel_pstate)
intel_pstate_clear_update_util_hook(cpu);
kfree(all_cpu_data[cpu]);
}
}
put_online_cpus();
vfree(all_cpu_data);
return -ENODEV;
return 0;
}
device_initcall(intel_pstate_init);

8
drivers/cpufreq/mt8173-cpufreq.c
View File

@ -232,16 +232,14 @@ static int mtk_cpufreq_set_target(struct cpufreq_policy *policy,
freq_hz = freq_table[index].frequency * 1000;
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_hz);
if (IS_ERR(opp)) {
rcu_read_unlock();
pr_err("cpu%d: failed to find OPP for %ld\n",
policy->cpu, freq_hz);
return PTR_ERR(opp);
}
vproc = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
/*
* If the new voltage or the intermediate voltage is higher than the
@ -411,16 +409,14 @@ static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu)
/* Search a safe voltage for intermediate frequency. */
rate = clk_get_rate(inter_clk);
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate);
if (IS_ERR(opp)) {
rcu_read_unlock();
pr_err("failed to get intermediate opp for cpu%d\n", cpu);
ret = PTR_ERR(opp);
goto out_free_opp_table;
}
info->intermediate_voltage = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
info->cpu_dev = cpu_dev;
info->proc_reg = proc_reg;

4
drivers/cpufreq/omap-cpufreq.c
View File

@ -63,16 +63,14 @@ static int omap_target(struct cpufreq_policy *policy, unsigned int index)
freq = ret;
if (mpu_reg) {
rcu_read_lock();
opp = dev_pm_opp_find_freq_ceil(mpu_dev, &freq);
if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n",
__func__, new_freq);
return -EINVAL;
}
volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
tol = volt * OPP_TOLERANCE / 100;
volt_old = regulator_get_voltage(mpu_reg);
}

52
drivers/cpufreq/powernv-cpufreq.c
View File

@ -144,6 +144,7 @@ static struct powernv_pstate_info {
unsigned int max;
unsigned int nominal;
unsigned int nr_pstates;
bool wof_enabled;
} powernv_pstate_info;
/* Use following macros for conversions between pstate_id and index */
@ -203,6 +204,7 @@ static int init_powernv_pstates(void)
const __be32 *pstate_ids, *pstate_freqs;
u32 len_ids, len_freqs;
u32 pstate_min, pstate_max, pstate_nominal;
u32 pstate_turbo, pstate_ultra_turbo;
power_mgt = of_find_node_by_path("/ibm,opal/power-mgt");
if (!power_mgt) {
@ -225,8 +227,29 @@ static int init_powernv_pstates(void)
pr_warn("ibm,pstate-nominal not found\n");
return -ENODEV;
}
if (of_property_read_u32(power_mgt, "ibm,pstate-ultra-turbo",
&pstate_ultra_turbo)) {
powernv_pstate_info.wof_enabled = false;
goto next;
}
if (of_property_read_u32(power_mgt, "ibm,pstate-turbo",
&pstate_turbo)) {
powernv_pstate_info.wof_enabled = false;
goto next;
}
if (pstate_turbo == pstate_ultra_turbo)
powernv_pstate_info.wof_enabled = false;
else
powernv_pstate_info.wof_enabled = true;
next:
pr_info("cpufreq pstate min %d nominal %d max %d\n", pstate_min,
pstate_nominal, pstate_max);
pr_info("Workload Optimized Frequency is %s in the platform\n",
(powernv_pstate_info.wof_enabled) ? "enabled" : "disabled");
pstate_ids = of_get_property(power_mgt, "ibm,pstate-ids", &len_ids);
if (!pstate_ids) {
@ -268,6 +291,13 @@ static int init_powernv_pstates(void)
powernv_pstate_info.nominal = i;
else if (id == pstate_min)
powernv_pstate_info.min = i;
if (powernv_pstate_info.wof_enabled && id == pstate_turbo) {
int j;
for (j = i - 1; j >= (int)powernv_pstate_info.max; j--)
powernv_freqs[j].flags = CPUFREQ_BOOST_FREQ;
}
}
/* End of list marker entry */
@ -305,9 +335,12 @@ static ssize_t cpuinfo_nominal_freq_show(struct cpufreq_policy *policy,
struct freq_attr cpufreq_freq_attr_cpuinfo_nominal_freq =
__ATTR_RO(cpuinfo_nominal_freq);
#define SCALING_BOOST_FREQS_ATTR_INDEX 2
static struct freq_attr *powernv_cpu_freq_attr[] = {
&cpufreq_freq_attr_scaling_available_freqs,
&cpufreq_freq_attr_cpuinfo_nominal_freq,
&cpufreq_freq_attr_scaling_boost_freqs,
NULL,
};
@ -1013,11 +1046,22 @@ static int __init powernv_cpufreq_init(void)
register_reboot_notifier(&powernv_cpufreq_reboot_nb);
opal_message_notifier_register(OPAL_MSG_OCC, &powernv_cpufreq_opal_nb);
rc = cpufreq_register_driver(&powernv_cpufreq_driver);
if (!rc)
return 0;
if (powernv_pstate_info.wof_enabled)
powernv_cpufreq_driver.boost_enabled = true;
else
powernv_cpu_freq_attr[SCALING_BOOST_FREQS_ATTR_INDEX] = NULL;
pr_info("Failed to register the cpufreq driver (%d)\n", rc);
rc = cpufreq_register_driver(&powernv_cpufreq_driver);
if (rc) {
pr_info("Failed to register the cpufreq driver (%d)\n", rc);
goto cleanup_notifiers;
}
if (powernv_pstate_info.wof_enabled)
cpufreq_enable_boost_support();
return 0;
cleanup_notifiers:
unregister_all_notifiers();
clean_chip_info();
out:

3
drivers/cpufreq/ppc_cbe_cpufreq_pmi.c
View File

@ -100,9 +100,6 @@ static int pmi_notifier(struct notifier_block *nb,
/* Should this really be called for CPUFREQ_ADJUST and CPUFREQ_NOTIFY
* policy events?)
*/
if (event == CPUFREQ_START)
return 0;
node = cbe_cpu_to_node(policy->cpu);
pr_debug("got notified, event=%lu, node=%u\n", event, node);

148
drivers/cpufreq/qoriq-cpufreq.c
View File

@ -11,6 +11,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/cpufreq.h>
#include <linux/cpu_cooling.h>
#include <linux/errno.h>
@ -37,53 +38,20 @@ struct cpu_data {
struct thermal_cooling_device *cdev;
};
/*
* Don't use cpufreq on this SoC -- used when the SoC would have otherwise
* matched a more generic compatible.
*/
#define SOC_BLACKLIST 1
/**
* struct soc_data - SoC specific data
* @freq_mask: mask the disallowed frequencies
* @flag: unique flags
* @flags: SOC_xxx
*/
struct soc_data {
u32 freq_mask[4];
u32 flag;
u32 flags;
};
#define FREQ_MASK 1
/* see hardware specification for the allowed frqeuencies */
static const struct soc_data sdata[] = {
{ /* used by p2041 and p3041 */
.freq_mask = {0x8, 0x8, 0x2, 0x2},
.flag = FREQ_MASK,
},
{ /* used by p5020 */
.freq_mask = {0x8, 0x2},
.flag = FREQ_MASK,
},
{ /* used by p4080, p5040 */
.freq_mask = {0},
.flag = 0,
},
};
/*
* the minimum allowed core frequency, in Hz
* for chassis v1.0, >= platform frequency
* for chassis v2.0, >= platform frequency / 2
*/
static u32 min_cpufreq;
static const u32 *fmask;
#if defined(CONFIG_ARM)
static int get_cpu_physical_id(int cpu)
{
return topology_core_id(cpu);
}
#else
static int get_cpu_physical_id(int cpu)
{
return get_hard_smp_processor_id(cpu);
}
#endif
static u32 get_bus_freq(void)
{
struct device_node *soc;
@ -101,9 +69,10 @@ static u32 get_bus_freq(void)
return sysfreq;
}
static struct device_node *cpu_to_clk_node(int cpu)
static struct clk *cpu_to_clk(int cpu)
{
struct device_node *np, *clk_np;
struct device_node *np;
struct clk *clk;
if (!cpu_present(cpu))
return NULL;
@ -112,37 +81,28 @@ static struct device_node *cpu_to_clk_node(int cpu)
if (!np)
return NULL;
clk_np = of_parse_phandle(np, "clocks", 0);
if (!clk_np)
return NULL;
clk = of_clk_get(np, 0);
of_node_put(np);
return clk_np;
return clk;
}
/* traverse cpu nodes to get cpu mask of sharing clock wire */
static void set_affected_cpus(struct cpufreq_policy *policy)
{
struct device_node *np, *clk_np;
struct cpumask *dstp = policy->cpus;
struct clk *clk;
int i;
np = cpu_to_clk_node(policy->cpu);
if (!np)
return;
for_each_present_cpu(i) {
clk_np = cpu_to_clk_node(i);
if (!clk_np)
clk = cpu_to_clk(i);
if (IS_ERR(clk)) {
pr_err("%s: no clock for cpu %d\n", __func__, i);
continue;
}
if (clk_np == np)
if (clk_is_match(policy->clk, clk))
cpumask_set_cpu(i, dstp);
of_node_put(clk_np);
}
of_node_put(np);
}
/* reduce the duplicated frequencies in frequency table */
@ -198,10 +158,11 @@ static void freq_table_sort(struct cpufreq_frequency_table *freq_table,
static int qoriq_cpufreq_cpu_init(struct cpufreq_policy *policy)
{
struct device_node *np, *pnode;
struct device_node *np;
int i, count, ret;
u32 freq, mask;
u32 freq;
struct clk *clk;
const struct clk_hw *hwclk;
struct cpufreq_frequency_table *table;
struct cpu_data *data;
unsigned int cpu = policy->cpu;
@ -221,17 +182,13 @@ static int qoriq_cpufreq_cpu_init(struct cpufreq_policy *policy)
goto err_nomem2;
}
pnode = of_parse_phandle(np, "clocks", 0);
if (!pnode) {
pr_err("%s: could not get clock information\n", __func__);
goto err_nomem2;
}
hwclk = __clk_get_hw(policy->clk);
count = clk_hw_get_num_parents(hwclk);
count = of_property_count_strings(pnode, "clock-names");
data->pclk = kcalloc(count, sizeof(struct clk *), GFP_KERNEL);
if (!data->pclk) {
pr_err("%s: no memory\n", __func__);
goto err_node;
goto err_nomem2;
}
table = kcalloc(count + 1, sizeof(*table), GFP_KERNEL);
@ -240,23 +197,11 @@ static int qoriq_cpufreq_cpu_init(struct cpufreq_policy *policy)
goto err_pclk;
}
if (fmask)
mask = fmask[get_cpu_physical_id(cpu)];
else
mask = 0x0;
for (i = 0; i < count; i++) {
clk = of_clk_get(pnode, i);
clk = clk_hw_get_parent_by_index(hwclk, i)->clk;
data->pclk[i] = clk;
freq = clk_get_rate(clk);
/*
* the clock is valid if its frequency is not masked
* and large than minimum allowed frequency.
*/
if (freq < min_cpufreq || (mask & (1 << i)))
table[i].frequency = CPUFREQ_ENTRY_INVALID;
else
table[i].frequency = freq / 1000;
table[i].frequency = freq / 1000;
table[i].driver_data = i;
}
freq_table_redup(table, count);
@ -282,7 +227,6 @@ static int qoriq_cpufreq_cpu_init(struct cpufreq_policy *policy)
policy->cpuinfo.transition_latency = u64temp + 1;
of_node_put(np);
of_node_put(pnode);
return 0;
@ -290,10 +234,7 @@ err_nomem1:
kfree(table);
err_pclk:
kfree(data->pclk);
err_node:
of_node_put(pnode);
err_nomem2:
policy->driver_data = NULL;
kfree(data);
err_np:
of_node_put(np);
@ -357,12 +298,25 @@ static struct cpufreq_driver qoriq_cpufreq_driver = {
.attr = cpufreq_generic_attr,
};
static const struct soc_data blacklist = {
.flags = SOC_BLACKLIST,
};
static const struct of_device_id node_matches[] __initconst = {
{ .compatible = "fsl,p2041-clockgen", .data = &sdata[0], },
{ .compatible = "fsl,p3041-clockgen", .data = &sdata[0], },
{ .compatible = "fsl,p5020-clockgen", .data = &sdata[1], },
{ .compatible = "fsl,p4080-clockgen", .data = &sdata[2], },
{ .compatible = "fsl,p5040-clockgen", .data = &sdata[2], },
/* e6500 cannot use cpufreq due to erratum A-008083 */
{ .compatible = "fsl,b4420-clockgen", &blacklist },
{ .compatible = "fsl,b4860-clockgen", &blacklist },
{ .compatible = "fsl,t2080-clockgen", &blacklist },
{ .compatible = "fsl,t4240-clockgen", &blacklist },
{ .compatible = "fsl,ls1012a-clockgen", },
{ .compatible = "fsl,ls1021a-clockgen", },
{ .compatible = "fsl,ls1043a-clockgen", },
{ .compatible = "fsl,ls1046a-clockgen", },
{ .compatible = "fsl,ls1088a-clockgen", },
{ .compatible = "fsl,ls2080a-clockgen", },
{ .compatible = "fsl,p4080-clockgen", },
{ .compatible = "fsl,qoriq-clockgen-1.0", },
{ .compatible = "fsl,qoriq-clockgen-2.0", },
{}
};
@ -380,16 +334,12 @@ static int __init qoriq_cpufreq_init(void)
match = of_match_node(node_matches, np);
data = match->data;
if (data) {
if (data->flag)
fmask = data->freq_mask;
min_cpufreq = get_bus_freq();
} else {
min_cpufreq = get_bus_freq() / 2;
}
of_node_put(np);
if (data && data->flags & SOC_BLACKLIST)
return -ENODEV;
ret = cpufreq_register_driver(&qoriq_cpufreq_driver);
if (!ret)
pr_info("Freescale QorIQ CPU frequency scaling driver\n");

1
drivers/cpufreq/s3c2416-cpufreq.c
View File

@ -400,7 +400,6 @@ static int s3c2416_cpufreq_driver_init(struct cpufreq_policy *policy)
rate = clk_get_rate(s3c_freq->hclk);
if (rate < 133 * 1000 * 1000) {
pr_err("cpufreq: HCLK not at 133MHz\n");
clk_put(s3c_freq->hclk);
ret = -EINVAL;
goto err_armclk;
}

13
drivers/cpufreq/sti-cpufreq.c
View File

@ -160,6 +160,7 @@ static int sti_cpufreq_set_opp_info(void)
int pcode, substrate, major, minor;
int ret;
char name[MAX_PCODE_NAME_LEN];
struct opp_table *opp_table;
reg_fields = sti_cpufreq_match();
if (!reg_fields) {
@ -211,20 +212,20 @@ use_defaults:
snprintf(name, MAX_PCODE_NAME_LEN, "pcode%d", pcode);
ret = dev_pm_opp_set_prop_name(dev, name);
if (ret) {
opp_table = dev_pm_opp_set_prop_name(dev, name);
if (IS_ERR(opp_table)) {
dev_err(dev, "Failed to set prop name\n");
return ret;
return PTR_ERR(opp_table);
}
version[0] = BIT(major);
version[1] = BIT(minor);
version[2] = BIT(substrate);
ret = dev_pm_opp_set_supported_hw(dev, version, VERSION_ELEMENTS);
if (ret) {
opp_table = dev_pm_opp_set_supported_hw(dev, version, VERSION_ELEMENTS);
if (IS_ERR(opp_table)) {
dev_err(dev, "Failed to set supported hardware\n");
return ret;
return PTR_ERR(opp_table);
}
dev_dbg(dev, "pcode: %d major: %d minor: %d substrate: %d\n",

268
drivers/cpufreq/ti-cpufreq.c 100644
View File

@ -0,0 +1,268 @@
/*
* TI CPUFreq/OPP hw-supported driver
*
* Copyright (C) 2016-2017 Texas Instruments, Inc.
* Dave Gerlach <d-gerlach@ti.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/cpu.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/pm_opp.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#define REVISION_MASK 0xF
#define REVISION_SHIFT 28
#define AM33XX_800M_ARM_MPU_MAX_FREQ 0x1E2F
#define AM43XX_600M_ARM_MPU_MAX_FREQ 0xFFA
#define DRA7_EFUSE_HAS_OD_MPU_OPP 11
#define DRA7_EFUSE_HAS_HIGH_MPU_OPP 15
#define DRA7_EFUSE_HAS_ALL_MPU_OPP 23
#define DRA7_EFUSE_NOM_MPU_OPP BIT(0)
#define DRA7_EFUSE_OD_MPU_OPP BIT(1)
#define DRA7_EFUSE_HIGH_MPU_OPP BIT(2)
#define VERSION_COUNT 2
struct ti_cpufreq_data;
struct ti_cpufreq_soc_data {
unsigned long (*efuse_xlate)(struct ti_cpufreq_data *opp_data,
unsigned long efuse);
unsigned long efuse_fallback;
unsigned long efuse_offset;
unsigned long efuse_mask;
unsigned long efuse_shift;
unsigned long rev_offset;
};
struct ti_cpufreq_data {
struct device *cpu_dev;
struct device_node *opp_node;
struct regmap *syscon;
const struct ti_cpufreq_soc_data *soc_data;
};
static unsigned long amx3_efuse_xlate(struct ti_cpufreq_data *opp_data,
unsigned long efuse)
{
if (!efuse)
efuse = opp_data->soc_data->efuse_fallback;
/* AM335x and AM437x use "OPP disable" bits, so invert */
return ~efuse;
}
static unsigned long dra7_efuse_xlate(struct ti_cpufreq_data *opp_data,
unsigned long efuse)
{
unsigned long calculated_efuse = DRA7_EFUSE_NOM_MPU_OPP;
/*
* The efuse on dra7 and am57 parts contains a specific
* value indicating the highest available OPP.
*/
switch (efuse) {
case DRA7_EFUSE_HAS_ALL_MPU_OPP:
case DRA7_EFUSE_HAS_HIGH_MPU_OPP:
calculated_efuse |= DRA7_EFUSE_HIGH_MPU_OPP;
case DRA7_EFUSE_HAS_OD_MPU_OPP:
calculated_efuse |= DRA7_EFUSE_OD_MPU_OPP;
}
return calculated_efuse;
}
static struct ti_cpufreq_soc_data am3x_soc_data = {
.efuse_xlate = amx3_efuse_xlate,
.efuse_fallback = AM33XX_800M_ARM_MPU_MAX_FREQ,
.efuse_offset = 0x07fc,
.efuse_mask = 0x1fff,
.rev_offset = 0x600,
};
static struct ti_cpufreq_soc_data am4x_soc_data = {
.efuse_xlate = amx3_efuse_xlate,
.efuse_fallback = AM43XX_600M_ARM_MPU_MAX_FREQ,
.efuse_offset = 0x0610,
.efuse_mask = 0x3f,
.rev_offset = 0x600,
};
static struct ti_cpufreq_soc_data dra7_soc_data = {
.efuse_xlate = dra7_efuse_xlate,
.efuse_offset = 0x020c,
.efuse_mask = 0xf80000,
.efuse_shift = 19,
.rev_offset = 0x204,
};
/**
* ti_cpufreq_get_efuse() - Parse and return efuse value present on SoC
* @opp_data: pointer to ti_cpufreq_data context
* @efuse_value: Set to the value parsed from efuse
*
* Returns error code if efuse not read properly.
*/
static int ti_cpufreq_get_efuse(struct ti_cpufreq_data *opp_data,
u32 *efuse_value)
{
struct device *dev = opp_data->cpu_dev;
u32 efuse;
int ret;
ret = regmap_read(opp_data->syscon, opp_data->soc_data->efuse_offset,
&efuse);
if (ret) {
dev_err(dev,
"Failed to read the efuse value from syscon: %d\n",
ret);
return ret;
}
efuse = (efuse & opp_data->soc_data->efuse_mask);
efuse >>= opp_data->soc_data->efuse_shift;
*efuse_value = opp_data->soc_data->efuse_xlate(opp_data, efuse);
return 0;
}
/**
* ti_cpufreq_get_rev() - Parse and return rev value present on SoC
* @opp_data: pointer to ti_cpufreq_data context
* @revision_value: Set to the value parsed from revision register
*
* Returns error code if revision not read properly.
*/
static int ti_cpufreq_get_rev(struct ti_cpufreq_data *opp_data,
u32 *revision_value)
{
struct device *dev = opp_data->cpu_dev;
u32 revision;
int ret;
ret = regmap_read(opp_data->syscon, opp_data->soc_data->rev_offset,
&revision);
if (ret) {
dev_err(dev,
"Failed to read the revision number from syscon: %d\n",
ret);
return ret;
}
*revision_value = BIT((revision >> REVISION_SHIFT) & REVISION_MASK);
return 0;
}
static int ti_cpufreq_setup_syscon_register(struct ti_cpufreq_data *opp_data)
{
struct device *dev = opp_data->cpu_dev;
struct device_node *np = opp_data->opp_node;
opp_data->syscon = syscon_regmap_lookup_by_phandle(np,
"syscon");
if (IS_ERR(opp_data->syscon)) {
dev_err(dev,
"\"syscon\" is missing, cannot use OPPv2 table.\n");
return PTR_ERR(opp_data->syscon);
}
return 0;
}
static const struct of_device_id ti_cpufreq_of_match[] = {
{ .compatible = "ti,am33xx", .data = &am3x_soc_data, },
{ .compatible = "ti,am4372", .data = &am4x_soc_data, },
{ .compatible = "ti,dra7", .data = &dra7_soc_data },
{},
};
static int ti_cpufreq_init(void)
{
u32 version[VERSION_COUNT];
struct device_node *np;
const struct of_device_id *match;
struct ti_cpufreq_data *opp_data;
int ret;
np = of_find_node_by_path("/");
match = of_match_node(ti_cpufreq_of_match, np);
if (!match)
return -ENODEV;
opp_data = kzalloc(sizeof(*opp_data), GFP_KERNEL);
if (!opp_data)
return -ENOMEM;
opp_data->soc_data = match->data;
opp_data->cpu_dev = get_cpu_device(0);
if (!opp_data->cpu_dev) {
pr_err("%s: Failed to get device for CPU0\n", __func__);
return -ENODEV;
}
opp_data->opp_node = dev_pm_opp_of_get_opp_desc_node(opp_data->cpu_dev);
if (!opp_data->opp_node) {
dev_info(opp_data->cpu_dev,
"OPP-v2 not supported, cpufreq-dt will attempt to use legacy tables.\n");
goto register_cpufreq_dt;
}
ret = ti_cpufreq_setup_syscon_register(opp_data);
if (ret)
goto fail_put_node;
/*
* OPPs determine whether or not they are supported based on
* two metrics:
* 0 - SoC Revision
* 1 - eFuse value
*/
ret = ti_cpufreq_get_rev(opp_data, &version[0]);
if (ret)
goto fail_put_node;
ret = ti_cpufreq_get_efuse(opp_data, &version[1]);
if (ret)
goto fail_put_node;
of_node_put(opp_data->opp_node);
ret = PTR_ERR_OR_ZERO(dev_pm_opp_set_supported_hw(opp_data->cpu_dev,
version, VERSION_COUNT));
if (ret) {
dev_err(opp_data->cpu_dev,
"Failed to set supported hardware\n");
goto fail_put_node;
}
register_cpufreq_dt:
platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
return 0;
fail_put_node:
of_node_put(opp_data->opp_node);
return ret;
}
device_initcall(ti_cpufreq_init);

11
drivers/cpuidle/governors/menu.c
View File

@ -19,6 +19,7 @@
#include <linux/tick.h>
#include <linux/sched.h>
#include <linux/math64.h>
#include <linux/cpu.h>
/*
* Please note when changing the tuning values:
@ -280,17 +281,23 @@ again:
static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
{
struct menu_device *data = this_cpu_ptr(&menu_devices);
struct device *device = get_cpu_device(dev->cpu);
int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
int i;
unsigned int interactivity_req;
unsigned int expected_interval;
unsigned long nr_iowaiters, cpu_load;
int resume_latency = dev_pm_qos_read_value(device);
if (data->needs_update) {
menu_update(drv, dev);
data->needs_update = 0;
}
/* resume_latency is 0 means no restriction */
if (resume_latency && resume_latency < latency_req)
latency_req = resume_latency;
/* Special case when user has set very strict latency requirement */
if (unlikely(latency_req == 0))
return 0;
@ -357,9 +364,9 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
if (s->disabled || su->disable)
continue;
if (s->target_residency > data->predicted_us)
continue;
break;
if (s->exit_latency > latency_req)
continue;
break;
data->last_state_idx = i;
}

4
drivers/devfreq/devfreq-event.c
View File

@ -306,7 +306,7 @@ struct devfreq_event_dev *devfreq_event_add_edev(struct device *dev,
struct devfreq_event_desc *desc)
{
struct devfreq_event_dev *edev;
static atomic_t event_no = ATOMIC_INIT(0);
static atomic_t event_no = ATOMIC_INIT(-1);
int ret;
if (!dev || !desc)
@ -329,7 +329,7 @@ struct devfreq_event_dev *devfreq_event_add_edev(struct device *dev,
edev->dev.class = devfreq_event_class;
edev->dev.release = devfreq_event_release_edev;
dev_set_name(&edev->dev, "event.%d", atomic_inc_return(&event_no) - 1);
dev_set_name(&edev->dev, "event%d", atomic_inc_return(&event_no));
ret = device_register(&edev->dev);
if (ret < 0) {
put_device(&edev->dev);

114
drivers/devfreq/devfreq.c
View File

@ -111,18 +111,16 @@ static void devfreq_set_freq_table(struct devfreq *devfreq)
return;
}
rcu_read_lock();
for (i = 0, freq = 0; i < profile->max_state; i++, freq++) {
opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq);
if (IS_ERR(opp)) {
devm_kfree(devfreq->dev.parent, profile->freq_table);
profile->max_state = 0;
rcu_read_unlock();
return;
}
dev_pm_opp_put(opp);
profile->freq_table[i] = freq;
}
rcu_read_unlock();
}
/**
@ -130,7 +128,7 @@ static void devfreq_set_freq_table(struct devfreq *devfreq)
* @devfreq: the devfreq instance
* @freq: the update target frequency
*/
static int devfreq_update_status(struct devfreq *devfreq, unsigned long freq)
int devfreq_update_status(struct devfreq *devfreq, unsigned long freq)
{
int lev, prev_lev, ret = 0;
unsigned long cur_time;
@ -166,6 +164,7 @@ out:
devfreq->last_stat_updated = cur_time;
return ret;
}
EXPORT_SYMBOL(devfreq_update_status);
/**
* find_devfreq_governor() - find devfreq governor from name
@ -474,11 +473,15 @@ static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type,
}
/**
* _remove_devfreq() - Remove devfreq from the list and release its resources.
* @devfreq: the devfreq struct
* devfreq_dev_release() - Callback for struct device to release the device.
* @dev: the devfreq device
*
* Remove devfreq from the list and release its resources.
*/
static void _remove_devfreq(struct devfreq *devfreq)
static void devfreq_dev_release(struct device *dev)
{
struct devfreq *devfreq = to_devfreq(dev);
mutex_lock(&devfreq_list_lock);
if (IS_ERR(find_device_devfreq(devfreq->dev.parent))) {
mutex_unlock(&devfreq_list_lock);
@ -499,19 +502,6 @@ static void _remove_devfreq(struct devfreq *devfreq)
kfree(devfreq);
}
/**
* devfreq_dev_release() - Callback for struct device to release the device.
* @dev: the devfreq device
*
* This calls _remove_devfreq() if _remove_devfreq() is not called.
*/
static void devfreq_dev_release(struct device *dev)
{
struct devfreq *devfreq = to_devfreq(dev);
_remove_devfreq(devfreq);
}
/**
* devfreq_add_device() - Add devfreq feature to the device
* @dev: the device to add devfreq feature.
@ -527,6 +517,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
{
struct devfreq *devfreq;
struct devfreq_governor *governor;
static atomic_t devfreq_no = ATOMIC_INIT(-1);
int err = 0;
if (!dev || !profile || !governor_name) {
@ -538,15 +529,14 @@ struct devfreq *devfreq_add_device(struct device *dev,
devfreq = find_device_devfreq(dev);
mutex_unlock(&devfreq_list_lock);
if (!IS_ERR(devfreq)) {
dev_err(dev, "%s: Unable to create devfreq for the device. It already has one.\n", __func__);
dev_err(dev, "%s: Unable to create devfreq for the device.\n",
__func__);
err = -EINVAL;
goto err_out;
}
devfreq = kzalloc(sizeof(struct devfreq), GFP_KERNEL);
if (!devfreq) {
dev_err(dev, "%s: Unable to create devfreq for the device\n",
__func__);
err = -ENOMEM;
goto err_out;
}
@ -569,18 +559,21 @@ struct devfreq *devfreq_add_device(struct device *dev,
mutex_lock(&devfreq->lock);
}
dev_set_name(&devfreq->dev, "%s", dev_name(dev));
dev_set_name(&devfreq->dev, "devfreq%d",
atomic_inc_return(&devfreq_no));
err = device_register(&devfreq->dev);
if (err) {
mutex_unlock(&devfreq->lock);
goto err_out;
}
devfreq->trans_table = devm_kzalloc(&devfreq->dev, sizeof(unsigned int) *
devfreq->trans_table = devm_kzalloc(&devfreq->dev,
sizeof(unsigned int) *
devfreq->profile->max_state *
devfreq->profile->max_state,
GFP_KERNEL);
devfreq->time_in_state = devm_kzalloc(&devfreq->dev, sizeof(unsigned long) *
devfreq->time_in_state = devm_kzalloc(&devfreq->dev,
sizeof(unsigned long) *
devfreq->profile->max_state,
GFP_KERNEL);
devfreq->last_stat_updated = jiffies;
@ -939,6 +932,9 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr,
if (df->governor == governor) {
ret = 0;
goto out;
} else if (df->governor->immutable || governor->immutable) {
ret = -EINVAL;
goto out;
}
if (df->governor) {
@ -968,13 +964,33 @@ static ssize_t available_governors_show(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct devfreq_governor *tmp_governor;
struct devfreq *df = to_devfreq(d);
ssize_t count = 0;
mutex_lock(&devfreq_list_lock);
list_for_each_entry(tmp_governor, &devfreq_governor_list, node)
count += scnprintf(&buf[count], (PAGE_SIZE - count - 2),
"%s ", tmp_governor->name);
/*
* The devfreq with immutable governor (e.g., passive) shows
* only own governor.
*/
if (df->governor->immutable) {
count = scnprintf(&buf[count], DEVFREQ_NAME_LEN,
"%s ", df->governor_name);
/*
* The devfreq device shows the registered governor except for
* immutable governors such as passive governor .
*/
} else {
struct devfreq_governor *governor;
list_for_each_entry(governor, &devfreq_governor_list, node) {
if (governor->immutable)
continue;
count += scnprintf(&buf[count], (PAGE_SIZE - count - 2),
"%s ", governor->name);
}
}
mutex_unlock(&devfreq_list_lock);
/* Truncate the trailing space */
@ -995,7 +1011,7 @@ static ssize_t cur_freq_show(struct device *dev, struct device_attribute *attr,
if (devfreq->profile->get_cur_freq &&
!devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq))
return sprintf(buf, "%lu\n", freq);
return sprintf(buf, "%lu\n", freq);
return sprintf(buf, "%lu\n", devfreq->previous_freq);
}
@ -1112,17 +1128,16 @@ static ssize_t available_frequencies_show(struct device *d,
ssize_t count = 0;
unsigned long freq = 0;
rcu_read_lock();
do {
opp = dev_pm_opp_find_freq_ceil(dev, &freq);
if (IS_ERR(opp))
break;
dev_pm_opp_put(opp);
count += scnprintf(&buf[count], (PAGE_SIZE - count - 2),
"%lu ", freq);
freq++;
} while (1);
rcu_read_unlock();
/* Truncate the trailing space */
if (count)
@ -1224,11 +1239,8 @@ subsys_initcall(devfreq_init);
* @freq: The frequency given to target function
* @flags: Flags handed from devfreq framework.
*
* Locking: This function must be called under rcu_read_lock(). opp is a rcu
* protected pointer. The reason for the same is that the opp pointer which is
* returned will remain valid for use with opp_get_{voltage, freq} only while
* under the locked area. The pointer returned must be used prior to unlocking
* with rcu_read_unlock() to maintain the integrity of the pointer.
* The callers are required to call dev_pm_opp_put() for the returned OPP after
* use.
*/
struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
unsigned long *freq,
@ -1265,18 +1277,7 @@ EXPORT_SYMBOL(devfreq_recommended_opp);
*/
int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq)
{
struct srcu_notifier_head *nh;
int ret = 0;
rcu_read_lock();
nh = dev_pm_opp_get_notifier(dev);
if (IS_ERR(nh))
ret = PTR_ERR(nh);
rcu_read_unlock();
if (!ret)
ret = srcu_notifier_chain_register(nh, &devfreq->nb);
return ret;
return dev_pm_opp_register_notifier(dev, &devfreq->nb);
}
EXPORT_SYMBOL(devfreq_register_opp_notifier);
@ -1292,18 +1293,7 @@ EXPORT_SYMBOL(devfreq_register_opp_notifier);
*/
int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq)
{
struct srcu_notifier_head *nh;
int ret = 0;
rcu_read_lock();
nh = dev_pm_opp_get_notifier(dev);
if (IS_ERR(nh))
ret = PTR_ERR(nh);
rcu_read_unlock();
if (!ret)
ret = srcu_notifier_chain_unregister(nh, &devfreq->nb);
return ret;
return dev_pm_opp_unregister_notifier(dev, &devfreq->nb);
}
EXPORT_SYMBOL(devfreq_unregister_opp_notifier);

327
drivers/devfreq/event/exynos-ppmu.c
View File

@ -17,13 +17,13 @@
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/suspend.h>
#include <linux/devfreq-event.h>
#include "exynos-ppmu.h"
struct exynos_ppmu_data {
void __iomem *base;
struct clk *clk;
};
@ -33,6 +33,7 @@ struct exynos_ppmu {
unsigned int num_events;
struct device *dev;
struct regmap *regmap;
struct exynos_ppmu_data ppmu;
};
@ -107,20 +108,28 @@ static int exynos_ppmu_find_ppmu_id(struct devfreq_event_dev *edev)
static int exynos_ppmu_disable(struct devfreq_event_dev *edev)
{
struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
int ret;
u32 pmnc;
/* Disable all counters */
__raw_writel(PPMU_CCNT_MASK |
PPMU_PMCNT0_MASK |
PPMU_PMCNT1_MASK |
PPMU_PMCNT2_MASK |
PPMU_PMCNT3_MASK,
info->ppmu.base + PPMU_CNTENC);
ret = regmap_write(info->regmap, PPMU_CNTENC,
PPMU_CCNT_MASK |
PPMU_PMCNT0_MASK |
PPMU_PMCNT1_MASK |
PPMU_PMCNT2_MASK |
PPMU_PMCNT3_MASK);
if (ret < 0)
return ret;
/* Disable PPMU */
pmnc = __raw_readl(info->ppmu.base + PPMU_PMNC);
ret = regmap_read(info->regmap, PPMU_PMNC, &pmnc);
if (ret < 0)
return ret;
pmnc &= ~PPMU_PMNC_ENABLE_MASK;
__raw_writel(pmnc, info->ppmu.base + PPMU_PMNC);
ret = regmap_write(info->regmap, PPMU_PMNC, pmnc);
if (ret < 0)
return ret;
return 0;
}
@ -129,29 +138,42 @@ static int exynos_ppmu_set_event(struct devfreq_event_dev *edev)
{
struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
int id = exynos_ppmu_find_ppmu_id(edev);
int ret;
u32 pmnc, cntens;
if (id < 0)
return id;
/* Enable specific counter */
cntens = __raw_readl(info->ppmu.base + PPMU_CNTENS);
ret = regmap_read(info->regmap, PPMU_CNTENS, &cntens);
if (ret < 0)
return ret;
cntens |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
__raw_writel(cntens, info->ppmu.base + PPMU_CNTENS);
ret = regmap_write(info->regmap, PPMU_CNTENS, cntens);
if (ret < 0)
return ret;
/* Set the event of Read/Write data count */
__raw_writel(PPMU_RO_DATA_CNT | PPMU_WO_DATA_CNT,
info->ppmu.base + PPMU_BEVTxSEL(id));
ret = regmap_write(info->regmap, PPMU_BEVTxSEL(id),
PPMU_RO_DATA_CNT | PPMU_WO_DATA_CNT);
if (ret < 0)
return ret;
/* Reset cycle counter/performance counter and enable PPMU */
pmnc = __raw_readl(info->ppmu.base + PPMU_PMNC);
ret = regmap_read(info->regmap, PPMU_PMNC, &pmnc);
if (ret < 0)
return ret;
pmnc &= ~(PPMU_PMNC_ENABLE_MASK
| PPMU_PMNC_COUNTER_RESET_MASK
| PPMU_PMNC_CC_RESET_MASK);
pmnc |= (PPMU_ENABLE << PPMU_PMNC_ENABLE_SHIFT);
pmnc |= (PPMU_ENABLE << PPMU_PMNC_COUNTER_RESET_SHIFT);
pmnc |= (PPMU_ENABLE << PPMU_PMNC_CC_RESET_SHIFT);
__raw_writel(pmnc, info->ppmu.base + PPMU_PMNC);
ret = regmap_write(info->regmap, PPMU_PMNC, pmnc);
if (ret < 0)
return ret;
return 0;
}
@ -161,40 +183,64 @@ static int exynos_ppmu_get_event(struct devfreq_event_dev *edev,
{
struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
int id = exynos_ppmu_find_ppmu_id(edev);
u32 pmnc, cntenc;
unsigned int total_count, load_count;
unsigned int pmcnt3_high, pmcnt3_low;
unsigned int pmnc, cntenc;
int ret;
if (id < 0)
return -EINVAL;
/* Disable PPMU */
pmnc = __raw_readl(info->ppmu.base + PPMU_PMNC);
ret = regmap_read(info->regmap, PPMU_PMNC, &pmnc);
if (ret < 0)
return ret;
pmnc &= ~PPMU_PMNC_ENABLE_MASK;
__raw_writel(pmnc, info->ppmu.base + PPMU_PMNC);
ret = regmap_write(info->regmap, PPMU_PMNC, pmnc);
if (ret < 0)
return ret;
/* Read cycle count */
edata->total_count = __raw_readl(info->ppmu.base + PPMU_CCNT);
ret = regmap_read(info->regmap, PPMU_CCNT, &total_count);
if (ret < 0)
return ret;
edata->total_count = total_count;
/* Read performance count */
switch (id) {
case PPMU_PMNCNT0:
case PPMU_PMNCNT1:
case PPMU_PMNCNT2:
edata->load_count
= __raw_readl(info->ppmu.base + PPMU_PMNCT(id));
ret = regmap_read(info->regmap, PPMU_PMNCT(id), &load_count);
if (ret < 0)
return ret;
edata->load_count = load_count;
break;
case PPMU_PMNCNT3:
edata->load_count =
((__raw_readl(info->ppmu.base + PPMU_PMCNT3_HIGH) << 8)
| __raw_readl(info->ppmu.base + PPMU_PMCNT3_LOW));
ret = regmap_read(info->regmap, PPMU_PMCNT3_HIGH, &pmcnt3_high);
if (ret < 0)
return ret;
ret = regmap_read(info->regmap, PPMU_PMCNT3_LOW, &pmcnt3_low);
if (ret < 0)
return ret;
edata->load_count = ((pmcnt3_high << 8) | pmcnt3_low);
break;
default:
return -EINVAL;
}
/* Disable specific counter */
cntenc = __raw_readl(info->ppmu.base + PPMU_CNTENC);
ret = regmap_read(info->regmap, PPMU_CNTENC, &cntenc);
if (ret < 0)
return ret;
cntenc |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
__raw_writel(cntenc, info->ppmu.base + PPMU_CNTENC);
ret = regmap_write(info->regmap, PPMU_CNTENC, cntenc);
if (ret < 0)
return ret;
dev_dbg(&edev->dev, "%s (event: %ld/%ld)\n", edev->desc->name,
edata->load_count, edata->total_count);
@ -214,36 +260,93 @@ static const struct devfreq_event_ops exynos_ppmu_ops = {
static int exynos_ppmu_v2_disable(struct devfreq_event_dev *edev)
{
struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
int ret;
u32 pmnc, clear;
/* Disable all counters */
clear = (PPMU_CCNT_MASK | PPMU_PMCNT0_MASK | PPMU_PMCNT1_MASK
| PPMU_PMCNT2_MASK | PPMU_PMCNT3_MASK);
ret = regmap_write(info->regmap, PPMU_V2_FLAG, clear);
if (ret < 0)
return ret;
__raw_writel(clear, info->ppmu.base + PPMU_V2_FLAG);
__raw_writel(clear, info->ppmu.base + PPMU_V2_INTENC);
__raw_writel(clear, info->ppmu.base + PPMU_V2_CNTENC);
__raw_writel(clear, info->ppmu.base + PPMU_V2_CNT_RESET);
ret = regmap_write(info->regmap, PPMU_V2_INTENC, clear);
if (ret < 0)
return ret;
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CIG_CFG0);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CIG_CFG1);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CIG_CFG2);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CIG_RESULT);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CNT_AUTO);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CH_EV0_TYPE);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CH_EV1_TYPE);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CH_EV2_TYPE);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_CH_EV3_TYPE);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_SM_ID_V);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_SM_ID_A);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_SM_OTHERS_V);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_SM_OTHERS_A);
__raw_writel(0x0, info->ppmu.base + PPMU_V2_INTERRUPT_RESET);
ret = regmap_write(info->regmap, PPMU_V2_CNTENC, clear);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CNT_RESET, clear);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CIG_CFG0, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CIG_CFG1, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CIG_CFG2, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CIG_RESULT, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CNT_AUTO, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CH_EV0_TYPE, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CH_EV1_TYPE, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CH_EV2_TYPE, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_CH_EV3_TYPE, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_SM_ID_V, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_SM_ID_A, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_SM_OTHERS_V, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_SM_OTHERS_A, 0x0);
if (ret < 0)
return ret;
ret = regmap_write(info->regmap, PPMU_V2_INTERRUPT_RESET, 0x0);
if (ret < 0)
return ret;
/* Disable PPMU */
pmnc = __raw_readl(info->ppmu.base + PPMU_V2_PMNC);
ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
if (ret < 0)
return ret;
pmnc &= ~PPMU_PMNC_ENABLE_MASK;
__raw_writel(pmnc, info->ppmu.base + PPMU_V2_PMNC);
ret = regmap_write(info->regmap, PPMU_V2_PMNC, pmnc);
if (ret < 0)
return ret;
return 0;
}
@ -251,30 +354,43 @@ static int exynos_ppmu_v2_disable(struct devfreq_event_dev *edev)
static int exynos_ppmu_v2_set_event(struct devfreq_event_dev *edev)
{
struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
unsigned int pmnc, cntens;
int id = exynos_ppmu_find_ppmu_id(edev);
u32 pmnc, cntens;
int ret;
/* Enable all counters */
cntens = __raw_readl(info->ppmu.base + PPMU_V2_CNTENS);
ret = regmap_read(info->regmap, PPMU_V2_CNTENS, &cntens);
if (ret < 0)
return ret;
cntens |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
__raw_writel(cntens, info->ppmu.base + PPMU_V2_CNTENS);
ret = regmap_write(info->regmap, PPMU_V2_CNTENS, cntens);
if (ret < 0)
return ret;
/* Set the event of Read/Write data count */
switch (id) {
case PPMU_PMNCNT0:
case PPMU_PMNCNT1:
case PPMU_PMNCNT2:
__raw_writel(PPMU_V2_RO_DATA_CNT | PPMU_V2_WO_DATA_CNT,
info->ppmu.base + PPMU_V2_CH_EVx_TYPE(id));
ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
PPMU_V2_RO_DATA_CNT | PPMU_V2_WO_DATA_CNT);
if (ret < 0)
return ret;
break;
case PPMU_PMNCNT3:
__raw_writel(PPMU_V2_EVT3_RW_DATA_CNT,
info->ppmu.base + PPMU_V2_CH_EVx_TYPE(id));
ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
PPMU_V2_EVT3_RW_DATA_CNT);
if (ret < 0)
return ret;
break;
}
/* Reset cycle counter/performance counter and enable PPMU */
pmnc = __raw_readl(info->ppmu.base + PPMU_V2_PMNC);
ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
if (ret < 0)
return ret;
pmnc &= ~(PPMU_PMNC_ENABLE_MASK
| PPMU_PMNC_COUNTER_RESET_MASK
| PPMU_PMNC_CC_RESET_MASK
@ -284,7 +400,10 @@ static int exynos_ppmu_v2_set_event(struct devfreq_event_dev *edev)
pmnc |= (PPMU_ENABLE << PPMU_PMNC_COUNTER_RESET_SHIFT);
pmnc |= (PPMU_ENABLE << PPMU_PMNC_CC_RESET_SHIFT);
pmnc |= (PPMU_V2_MODE_MANUAL << PPMU_V2_PMNC_START_MODE_SHIFT);
__raw_writel(pmnc, info->ppmu.base + PPMU_V2_PMNC);
ret = regmap_write(info->regmap, PPMU_V2_PMNC, pmnc);
if (ret < 0)
return ret;
return 0;
}
@ -294,37 +413,61 @@ static int exynos_ppmu_v2_get_event(struct devfreq_event_dev *edev,
{
struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
int id = exynos_ppmu_find_ppmu_id(edev);
u32 pmnc, cntenc;
u32 pmcnt_high, pmcnt_low;
u64 load_count = 0;
int ret;
unsigned int pmnc, cntenc;
unsigned int pmcnt_high, pmcnt_low;
unsigned int total_count, count;
unsigned long load_count = 0;
/* Disable PPMU */
pmnc = __raw_readl(info->ppmu.base + PPMU_V2_PMNC);
ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
if (ret < 0)
return ret;
pmnc &= ~PPMU_PMNC_ENABLE_MASK;
__raw_writel(pmnc, info->ppmu.base + PPMU_V2_PMNC);
ret = regmap_write(info->regmap, PPMU_V2_PMNC, pmnc);
if (ret < 0)
return ret;
/* Read cycle count and performance count */
edata->total_count = __raw_readl(info->ppmu.base + PPMU_V2_CCNT);
ret = regmap_read(info->regmap, PPMU_V2_CCNT, &total_count);
if (ret < 0)
return ret;
edata->total_count = total_count;
switch (id) {
case PPMU_PMNCNT0:
case PPMU_PMNCNT1:
case PPMU_PMNCNT2:
load_count = __raw_readl(info->ppmu.base + PPMU_V2_PMNCT(id));
ret = regmap_read(info->regmap, PPMU_V2_PMNCT(id), &count);
if (ret < 0)
return ret;
load_count = count;
break;
case PPMU_PMNCNT3:
pmcnt_high = __raw_readl(info->ppmu.base + PPMU_V2_PMCNT3_HIGH);
pmcnt_low = __raw_readl(info->ppmu.base + PPMU_V2_PMCNT3_LOW);
load_count = ((u64)((pmcnt_high & 0xff)) << 32)
+ (u64)pmcnt_low;
ret = regmap_read(info->regmap, PPMU_V2_PMCNT3_HIGH,
&pmcnt_high);
if (ret < 0)
return ret;
ret = regmap_read(info->regmap, PPMU_V2_PMCNT3_LOW, &pmcnt_low);
if (ret < 0)
return ret;
load_count = ((u64)((pmcnt_high & 0xff)) << 32)+ (u64)pmcnt_low;
break;
}
edata->load_count = load_count;
/* Disable all counters */
cntenc = __raw_readl(info->ppmu.base + PPMU_V2_CNTENC);
ret = regmap_read(info->regmap, PPMU_V2_CNTENC, &cntenc);
if (ret < 0)
return 0;
cntenc |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
__raw_writel(cntenc, info->ppmu.base + PPMU_V2_CNTENC);
ret = regmap_write(info->regmap, PPMU_V2_CNTENC, cntenc);
if (ret < 0)
return ret;
dev_dbg(&edev->dev, "%25s (load: %ld / %ld)\n", edev->desc->name,
edata->load_count, edata->total_count);
@ -411,10 +554,19 @@ static int of_get_devfreq_events(struct device_node *np,
return 0;
}
static int exynos_ppmu_parse_dt(struct exynos_ppmu *info)
static struct regmap_config exynos_ppmu_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
};
static int exynos_ppmu_parse_dt(struct platform_device *pdev,
struct exynos_ppmu *info)
{
struct device *dev = info->dev;
struct device_node *np = dev->of_node;
struct resource *res;
void __iomem *base;
int ret = 0;
if (!np) {
@ -423,10 +575,17 @@ static int exynos_ppmu_parse_dt(struct exynos_ppmu *info)
}
/* Maps the memory mapped IO to control PPMU register */
info->ppmu.base = of_iomap(np, 0);
if (IS_ERR_OR_NULL(info->ppmu.base)) {
dev_err(dev, "failed to map memory region\n");
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
exynos_ppmu_regmap_config.max_register = resource_size(res) - 4;
info->regmap = devm_regmap_init_mmio(dev, base,
&exynos_ppmu_regmap_config);
if (IS_ERR(info->regmap)) {
dev_err(dev, "failed to initialize regmap\n");
return PTR_ERR(info->regmap);
}
info->ppmu.clk = devm_clk_get(dev, "ppmu");
@ -438,15 +597,10 @@ static int exynos_ppmu_parse_dt(struct exynos_ppmu *info)
ret = of_get_devfreq_events(np, info);
if (ret < 0) {
dev_err(dev, "failed to parse exynos ppmu dt node\n");
goto err;
return ret;
}
return 0;
err:
iounmap(info->ppmu.base);
return ret;
}
static int exynos_ppmu_probe(struct platform_device *pdev)
@ -463,7 +617,7 @@ static int exynos_ppmu_probe(struct platform_device *pdev)
info->dev = &pdev->dev;
/* Parse dt data to get resource */
ret = exynos_ppmu_parse_dt(info);
ret = exynos_ppmu_parse_dt(pdev, info);
if (ret < 0) {
dev_err(&pdev->dev,
"failed to parse devicetree for resource\n");
@ -476,8 +630,7 @@ static int exynos_ppmu_probe(struct platform_device *pdev)
if (!info->edev) {
dev_err(&pdev->dev,
"failed to allocate memory devfreq-event devices\n");
ret = -ENOMEM;
goto err;
return -ENOMEM;
}
edev = info->edev;
platform_set_drvdata(pdev, info);
@ -488,17 +641,16 @@ static int exynos_ppmu_probe(struct platform_device *pdev)
ret = PTR_ERR(edev[i]);
dev_err(&pdev->dev,
"failed to add devfreq-event device\n");
goto err;
return PTR_ERR(edev[i]);
}
pr_info("exynos-ppmu: new PPMU device registered %s (%s)\n",
dev_name(&pdev->dev), desc[i].name);
}
clk_prepare_enable(info->ppmu.clk);
return 0;
err:
iounmap(info->ppmu.base);
return ret;
}
static int exynos_ppmu_remove(struct platform_device *pdev)
@ -506,7 +658,6 @@ static int exynos_ppmu_remove(struct platform_device *pdev)
struct exynos_ppmu *info = platform_get_drvdata(pdev);
clk_disable_unprepare(info->ppmu.clk);
iounmap(info->ppmu.base);
return 0;
}

22
drivers/devfreq/exynos-bus.c
View File

@ -103,18 +103,17 @@ static int exynos_bus_target(struct device *dev, unsigned long *freq, u32 flags)
int ret = 0;
/* Get new opp-bus instance according to new bus clock */
rcu_read_lock();
new_opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(new_opp)) {
dev_err(dev, "failed to get recommended opp instance\n");
rcu_read_unlock();
return PTR_ERR(new_opp);
}
new_freq = dev_pm_opp_get_freq(new_opp);
new_volt = dev_pm_opp_get_voltage(new_opp);
dev_pm_opp_put(new_opp);
old_freq = bus->curr_freq;
rcu_read_unlock();
if (old_freq == new_freq)
return 0;
@ -147,8 +146,8 @@ static int exynos_bus_target(struct device *dev, unsigned long *freq, u32 flags)
}
bus->curr_freq = new_freq;
dev_dbg(dev, "Set the frequency of bus (%lukHz -> %lukHz)\n",
old_freq/1000, new_freq/1000);
dev_dbg(dev, "Set the frequency of bus (%luHz -> %luHz, %luHz)\n",
old_freq, new_freq, clk_get_rate(bus->clk));
out:
mutex_unlock(&bus->lock);
@ -214,17 +213,16 @@ static int exynos_bus_passive_target(struct device *dev, unsigned long *freq,
int ret = 0;
/* Get new opp-bus instance according to new bus clock */
rcu_read_lock();
new_opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(new_opp)) {
dev_err(dev, "failed to get recommended opp instance\n");
rcu_read_unlock();
return PTR_ERR(new_opp);
}
new_freq = dev_pm_opp_get_freq(new_opp);
dev_pm_opp_put(new_opp);
old_freq = bus->curr_freq;
rcu_read_unlock();
if (old_freq == new_freq)
return 0;
@ -241,8 +239,8 @@ static int exynos_bus_passive_target(struct device *dev, unsigned long *freq,
*freq = new_freq;
bus->curr_freq = new_freq;
dev_dbg(dev, "Set the frequency of bus (%lukHz -> %lukHz)\n",
old_freq/1000, new_freq/1000);
dev_dbg(dev, "Set the frequency of bus (%luHz -> %luHz, %luHz)\n",
old_freq, new_freq, clk_get_rate(bus->clk));
out:
mutex_unlock(&bus->lock);
@ -358,16 +356,14 @@ static int exynos_bus_parse_of(struct device_node *np,
rate = clk_get_rate(bus->clk);
rcu_read_lock();
opp = devfreq_recommended_opp(dev, &rate, 0);
if (IS_ERR(opp)) {
dev_err(dev, "failed to find dev_pm_opp\n");
rcu_read_unlock();
ret = PTR_ERR(opp);
goto err_opp;
}
bus->curr_freq = dev_pm_opp_get_freq(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
return 0;

2
drivers/devfreq/governor.h
View File

@ -38,4 +38,6 @@ extern void devfreq_interval_update(struct devfreq *devfreq,
extern int devfreq_add_governor(struct devfreq_governor *governor);
extern int devfreq_remove_governor(struct devfreq_governor *governor);
extern int devfreq_update_status(struct devfreq *devfreq, unsigned long freq);
#endif /* _GOVERNOR_H */

10
drivers/devfreq/governor_passive.c
View File

@ -59,14 +59,14 @@ static int devfreq_passive_get_target_freq(struct devfreq *devfreq,
* list of parent device. Because in this case, *freq is temporary
* value which is decided by ondemand governor.
*/
rcu_read_lock();
opp = devfreq_recommended_opp(parent_devfreq->dev.parent, freq, 0);
rcu_read_unlock();
if (IS_ERR(opp)) {
ret = PTR_ERR(opp);
goto out;
}
dev_pm_opp_put(opp);
/*
* Get the OPP table's index of decided freqeuncy by governor
* of parent device.
@ -112,6 +112,11 @@ static int update_devfreq_passive(struct devfreq *devfreq, unsigned long freq)
if (ret < 0)
goto out;
if (devfreq->profile->freq_table
&& (devfreq_update_status(devfreq, freq)))
dev_err(&devfreq->dev,
"Couldn't update frequency transition information.\n");
devfreq->previous_freq = freq;
out:
@ -179,6 +184,7 @@ static int devfreq_passive_event_handler(struct devfreq *devfreq,
static struct devfreq_governor devfreq_passive = {
.name = "passive",
.immutable = 1,
.get_target_freq = devfreq_passive_get_target_freq,
.event_handler = devfreq_passive_event_handler,
};

11
drivers/devfreq/governor_userspace.c
View File

@ -1,5 +1,5 @@
/*
* linux/drivers/devfreq/governor_simpleondemand.c
* linux/drivers/devfreq/governor_userspace.c
*
* Copyright (C) 2011 Samsung Electronics
* MyungJoo Ham <myungjoo.ham@samsung.com>
@ -50,7 +50,6 @@ static ssize_t store_freq(struct device *dev, struct device_attribute *attr,
unsigned long wanted;
int err = 0;
mutex_lock(&devfreq->lock);
data = devfreq->data;
@ -112,7 +111,13 @@ out:
static void userspace_exit(struct devfreq *devfreq)
{
sysfs_remove_group(&devfreq->dev.kobj, &dev_attr_group);
/*
* Remove the sysfs entry, unless this is being called after
* device_del(), which should have done this already via kobject_del().
*/
if (devfreq->dev.kobj.sd)
sysfs_remove_group(&devfreq->dev.kobj, &dev_attr_group);
kfree(devfreq->data);
devfreq->data = NULL;
}

16
drivers/devfreq/rk3399_dmc.c
View File

@ -91,17 +91,13 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
unsigned long target_volt, target_rate;
int err;
rcu_read_lock();
opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(opp)) {
rcu_read_unlock();
if (IS_ERR(opp))
return PTR_ERR(opp);
}
target_rate = dev_pm_opp_get_freq(opp);
target_volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
if (dmcfreq->rate == target_rate)
return 0;
@ -422,15 +418,13 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
data->rate = clk_get_rate(data->dmc_clk);
rcu_read_lock();
opp = devfreq_recommended_opp(dev, &data->rate, 0);
if (IS_ERR(opp)) {
rcu_read_unlock();
if (IS_ERR(opp))
return PTR_ERR(opp);
}
data->rate = dev_pm_opp_get_freq(opp);
data->volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
rk3399_devfreq_dmc_profile.initial_freq = data->rate;

4
drivers/devfreq/tegra-devfreq.c
View File

@ -487,15 +487,13 @@ static int tegra_devfreq_target(struct device *dev, unsigned long *freq,
struct dev_pm_opp *opp;
unsigned long rate = *freq * KHZ;
rcu_read_lock();
opp = devfreq_recommended_opp(dev, &rate, flags);
if (IS_ERR(opp)) {
rcu_read_unlock();
dev_err(dev, "Failed to find opp for %lu KHz\n", *freq);
return PTR_ERR(opp);
}
rate = dev_pm_opp_get_freq(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
clk_set_min_rate(tegra->emc_clock, rate);
clk_set_rate(tegra->emc_clock, 0);

11
drivers/thermal/cpu_cooling.c
View File

@ -297,8 +297,6 @@ static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device,
if (!power_table)
return -ENOMEM;
rcu_read_lock();
for (freq = 0, i = 0;
opp = dev_pm_opp_find_freq_ceil(dev, &freq), !IS_ERR(opp);
freq++, i++) {
@ -306,13 +304,13 @@ static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device,
u64 power;
if (i >= num_opps) {
rcu_read_unlock();
ret = -EAGAIN;
goto free_power_table;
}
freq_mhz = freq / 1000000;
voltage_mv = dev_pm_opp_get_voltage(opp) / 1000;
dev_pm_opp_put(opp);
/*
* Do the multiplication with MHz and millivolt so as
@ -328,8 +326,6 @@ static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device,
power_table[i].power = power;
}
rcu_read_unlock();
if (i != num_opps) {
ret = PTR_ERR(opp);
goto free_power_table;
@ -433,13 +429,10 @@ static int get_static_power(struct cpufreq_cooling_device *cpufreq_device,
return 0;
}
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(cpufreq_device->cpu_dev, freq_hz,
true);
voltage = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
if (voltage == 0) {
dev_warn_ratelimited(cpufreq_device->cpu_dev,

15
drivers/thermal/devfreq_cooling.c
View File

@ -113,15 +113,15 @@ static int partition_enable_opps(struct devfreq_cooling_device *dfc,
unsigned int freq = dfc->freq_table[i];
bool want_enable = i >= cdev_state ? true : false;
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(dev, freq, !want_enable);
rcu_read_unlock();
if (PTR_ERR(opp) == -ERANGE)
continue;
else if (IS_ERR(opp))
return PTR_ERR(opp);
dev_pm_opp_put(opp);
if (want_enable)
ret = dev_pm_opp_enable(dev, freq);
else
@ -221,15 +221,12 @@ get_static_power(struct devfreq_cooling_device *dfc, unsigned long freq)
if (!dfc->power_ops->get_static_power)
return 0;
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(dev, freq, true);
if (IS_ERR(opp) && (PTR_ERR(opp) == -ERANGE))
opp = dev_pm_opp_find_freq_exact(dev, freq, false);
voltage = dev_pm_opp_get_voltage(opp) / 1000; /* mV */
rcu_read_unlock();
dev_pm_opp_put(opp);
if (voltage == 0) {
dev_warn_ratelimited(dev,
@ -412,18 +409,14 @@ static int devfreq_cooling_gen_tables(struct devfreq_cooling_device *dfc)
unsigned long power_dyn, voltage;
struct dev_pm_opp *opp;
rcu_read_lock();
opp = dev_pm_opp_find_freq_floor(dev, &freq);
if (IS_ERR(opp)) {
rcu_read_unlock();
ret = PTR_ERR(opp);
goto free_tables;
}
voltage = dev_pm_opp_get_voltage(opp) / 1000; /* mV */
rcu_read_unlock();
dev_pm_opp_put(opp);
if (dfc->power_ops) {
power_dyn = get_dynamic_power(dfc, freq, voltage);

7
include/linux/cpufreq.h
View File

@ -31,7 +31,7 @@
#define CPUFREQ_ETERNAL (-1)
#define CPUFREQ_NAME_LEN 16
/* Print length for names. Extra 1 space for accomodating '\n' in prints */
/* Print length for names. Extra 1 space for accommodating '\n' in prints */
#define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1)
struct cpufreq_governor;
@ -115,7 +115,7 @@ struct cpufreq_policy {
* guarantee that frequency can be changed on any CPU sharing the
* policy and that the change will affect all of the policy CPUs then.
* - fast_switch_enabled is to be set by governors that support fast
* freqnency switching with the help of cpufreq_enable_fast_switch().
* frequency switching with the help of cpufreq_enable_fast_switch().
*/
bool fast_switch_possible;
bool fast_switch_enabled;
@ -415,9 +415,6 @@ static inline void cpufreq_resume(void) {}
/* Policy Notifiers */
#define CPUFREQ_ADJUST (0)
#define CPUFREQ_NOTIFY (1)
#define CPUFREQ_START (2)
#define CPUFREQ_CREATE_POLICY (3)
#define CPUFREQ_REMOVE_POLICY (4)
#ifdef CONFIG_CPU_FREQ
int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);

3
include/linux/devfreq.h
View File

@ -104,6 +104,8 @@ struct devfreq_dev_profile {
* struct devfreq_governor - Devfreq policy governor
* @node: list node - contains registered devfreq governors
* @name: Governor's name
* @immutable: Immutable flag for governor. If the value is 1,
* this govenror is never changeable to other governor.
* @get_target_freq: Returns desired operating frequency for the device.
* Basically, get_target_freq will run
* devfreq_dev_profile.get_dev_status() to get the
@ -121,6 +123,7 @@ struct devfreq_governor {
struct list_head node;
const char name[DEVFREQ_NAME_LEN];
const unsigned int immutable;
int (*get_target_freq)(struct devfreq *this, unsigned long *freq);
int (*event_handler)(struct devfreq *devfreq,
unsigned int event, void *data);

3
include/linux/pm_domain.h
View File

@ -182,6 +182,9 @@ static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
{
return -ENOTSUPP;
}
#define simple_qos_governor (*(struct dev_power_governor *)(NULL))
#define pm_domain_always_on_gov (*(struct dev_power_governor *)(NULL))
#endif
static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,

78
include/linux/pm_opp.h
View File

@ -78,6 +78,9 @@ struct dev_pm_set_opp_data {
#if defined(CONFIG_PM_OPP)
struct opp_table *dev_pm_opp_get_opp_table(struct device *dev);
void dev_pm_opp_put_opp_table(struct opp_table *opp_table);
unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
@ -88,7 +91,7 @@ int dev_pm_opp_get_opp_count(struct device *dev);
unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev);
unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev);
unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev);
struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev);
unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev);
struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
unsigned long freq,
@ -99,6 +102,7 @@ struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
unsigned long *freq);
void dev_pm_opp_put(struct dev_pm_opp *opp);
int dev_pm_opp_add(struct device *dev, unsigned long freq,
unsigned long u_volt);
@ -108,22 +112,30 @@ int dev_pm_opp_enable(struct device *dev, unsigned long freq);
int dev_pm_opp_disable(struct device *dev, unsigned long freq);
struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev);
int dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions,
unsigned int count);
void dev_pm_opp_put_supported_hw(struct device *dev);
int dev_pm_opp_set_prop_name(struct device *dev, const char *name);
void dev_pm_opp_put_prop_name(struct device *dev);
int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb);
int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb);
struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, unsigned int count);
void dev_pm_opp_put_supported_hw(struct opp_table *opp_table);
struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name);
void dev_pm_opp_put_prop_name(struct opp_table *opp_table);
struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count);
void dev_pm_opp_put_regulators(struct opp_table *opp_table);
int dev_pm_opp_register_set_opp_helper(struct device *dev, int (*set_opp)(struct dev_pm_set_opp_data *data));
void dev_pm_opp_register_put_opp_helper(struct device *dev);
struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, int (*set_opp)(struct dev_pm_set_opp_data *data));
void dev_pm_opp_register_put_opp_helper(struct opp_table *opp_table);
int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq);
int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cpumask);
int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask);
void dev_pm_opp_remove_table(struct device *dev);
void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask);
#else
static inline struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
{
return ERR_PTR(-ENOTSUPP);
}
static inline void dev_pm_opp_put_opp_table(struct opp_table *opp_table) {}
static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
{
return 0;
@ -159,9 +171,9 @@ static inline unsigned long dev_pm_opp_get_max_transition_latency(struct device
return 0;
}
static inline struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev)
static inline unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev)
{
return NULL;
return 0;
}
static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
@ -182,6 +194,8 @@ static inline struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
return ERR_PTR(-ENOTSUPP);
}
static inline void dev_pm_opp_put(struct dev_pm_opp *opp) {}
static inline int dev_pm_opp_add(struct device *dev, unsigned long freq,
unsigned long u_volt)
{
@ -202,35 +216,39 @@ static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
return 0;
}
static inline struct srcu_notifier_head *dev_pm_opp_get_notifier(
struct device *dev)
static inline int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
{
return -ENOTSUPP;
}
static inline int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb)
{
return -ENOTSUPP;
}
static inline struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev,
const u32 *versions,
unsigned int count)
{
return ERR_PTR(-ENOTSUPP);
}
static inline int dev_pm_opp_set_supported_hw(struct device *dev,
const u32 *versions,
unsigned int count)
{
return -ENOTSUPP;
}
static inline void dev_pm_opp_put_supported_hw(struct opp_table *opp_table) {}
static inline void dev_pm_opp_put_supported_hw(struct device *dev) {}
static inline int dev_pm_opp_register_set_opp_helper(struct device *dev,
static inline struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev,
int (*set_opp)(struct dev_pm_set_opp_data *data))
{
return -ENOTSUPP;
return ERR_PTR(-ENOTSUPP);
}
static inline void dev_pm_opp_register_put_opp_helper(struct device *dev) {}
static inline void dev_pm_opp_register_put_opp_helper(struct opp_table *opp_table) {}
static inline int dev_pm_opp_set_prop_name(struct device *dev, const char *name)
static inline struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name)
{
return -ENOTSUPP;
return ERR_PTR(-ENOTSUPP);
}
static inline void dev_pm_opp_put_prop_name(struct device *dev) {}
static inline void dev_pm_opp_put_prop_name(struct opp_table *opp_table) {}
static inline struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count)
{
@ -270,6 +288,7 @@ void dev_pm_opp_of_remove_table(struct device *dev);
int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask);
void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask);
int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask);
struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev);
#else
static inline int dev_pm_opp_of_add_table(struct device *dev)
{
@ -293,6 +312,11 @@ static inline int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct
{
return -ENOTSUPP;
}
static inline struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
{
return NULL;
}
#endif
#endif /* __LINUX_OPP_H__ */

1
include/linux/pm_qos.h
View File

@ -6,7 +6,6 @@
*/
#include <linux/plist.h>
#include <linux/notifier.h>
#include <linux/miscdevice.h>
#include <linux/device.h>
#include <linux/workqueue.h>

2
kernel/power/suspend_test.c
View File

@ -166,7 +166,7 @@ static int __init setup_test_suspend(char *value)
return 0;
}
for (i = 0; pm_labels[i]; i++)
for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)
if (!strcmp(pm_labels[i], suspend_type)) {
test_state_label = pm_labels[i];
return 0;

2
kernel/power/swap.c
View File

@ -201,7 +201,7 @@ void free_all_swap_pages(int swap)
struct swsusp_extent *ext;
unsigned long offset;
ext = container_of(node, struct swsusp_extent, node);
ext = rb_entry(node, struct swsusp_extent, node);
rb_erase(node, &swsusp_extents);
for (offset = ext->start; offset <= ext->end; offset++)
swap_free(swp_entry(swap, offset));

1937
scripts/analyze_suspend.py
View File

File diff suppressed because it is too large Load Diff

569
tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py 100755
View File

@ -0,0 +1,569 @@
#!/usr/bin/python
# -*- coding: utf-8 -*-
#
""" This utility can be used to debug and tune the performance of the
intel_pstate driver. This utility can be used in two ways:
- If there is Linux trace file with pstate_sample events enabled, then
this utility can parse the trace file and generate performance plots.
- If user has not specified a trace file as input via command line parameters,
then this utility enables and collects trace data for a user specified interval
and generates performance plots.
Prerequisites:
Python version 2.7.x
gnuplot 5.0 or higher
gnuplot-py 1.8
(Most of the distributions have these required packages. They may be called
gnuplot-py, phython-gnuplot. )
HWP (Hardware P-States are disabled)
Kernel config for Linux trace is enabled
see print_help(): for Usage and Output details
"""
from __future__ import print_function
from datetime import datetime
import subprocess
import os
import time
import re
import sys
import getopt
import Gnuplot
from numpy import *
from decimal import *
__author__ = "Srinivas Pandruvada"
__copyright__ = " Copyright (c) 2017, Intel Corporation. "
__license__ = "GPL version 2"
MAX_CPUS = 256
# Define the csv file columns
C_COMM = 18
C_GHZ = 17
C_ELAPSED = 16
C_SAMPLE = 15
C_DURATION = 14
C_LOAD = 13
C_BOOST = 12
C_FREQ = 11
C_TSC = 10
C_APERF = 9
C_MPERF = 8
C_TO = 7
C_FROM = 6
C_SCALED = 5
C_CORE = 4
C_USEC = 3
C_SEC = 2
C_CPU = 1
global sample_num, last_sec_cpu, last_usec_cpu, start_time, testname
# 11 digits covers uptime to 115 days
getcontext().prec = 11
sample_num =0
last_sec_cpu = [0] * MAX_CPUS
last_usec_cpu = [0] * MAX_CPUS
def print_help():
print('intel_pstate_tracer.py:')
print(' Usage:')
print(' If the trace file is available, then to simply parse and plot, use (sudo not required):')
print(' ./intel_pstate_tracer.py [-c cpus] -t <trace_file> -n <test_name>')
print(' Or')
print(' ./intel_pstate_tracer.py [--cpu cpus] ---trace_file <trace_file> --name <test_name>')
print(' To generate trace file, parse and plot, use (sudo required):')
print(' sudo ./intel_pstate_tracer.py [-c cpus] -i <interval> -n <test_name>')
print(' Or')
print(' sudo ./intel_pstate_tracer.py [--cpu cpus] --interval <interval> --name <test_name>')
print(' Optional argument:')
print(' cpus: comma separated list of CPUs')
print(' Output:')
print(' If not already present, creates a "results/test_name" folder in the current working directory with:')
print(' cpu.csv - comma seperated values file with trace contents and some additional calculations.')
print(' cpu???.csv - comma seperated values file for CPU number ???.')
print(' *.png - a variety of PNG format plot files created from the trace contents and the additional calculations.')
print(' Notes:')
print(' Avoid the use of _ (underscore) in test names, because in gnuplot it is a subscript directive.')
print(' Maximum number of CPUs is {0:d}. If there are more the script will abort with an error.'.format(MAX_CPUS))
print(' Off-line CPUs cause the script to list some warnings, and create some empty files. Use the CPU mask feature for a clean run.')
print(' Empty y range warnings for autoscaled plots can occur and can be ignored.')
def plot_perf_busy_with_sample(cpu_index):
""" Plot method to per cpu information """
file_name = 'cpu{:0>3}.csv'.format(cpu_index)
if os.path.exists(file_name):
output_png = "cpu%03d_perf_busy_vs_samples.png" % cpu_index
g_plot = common_all_gnuplot_settings(output_png)
g_plot('set yrange [0:40]')
g_plot('set y2range [0:200]')
g_plot('set y2tics 0, 10')
g_plot('set title "{} : cpu perf busy vs. sample : CPU {:0>3} : {:%F %H:%M}"'.format(testname, cpu_index, datetime.now()))
# Override common
g_plot('set xlabel "Samples"')
g_plot('set ylabel "P-State"')
g_plot('set y2label "Scaled Busy/performance/io-busy(%)"')
set_4_plot_linestyles(g_plot)
g_plot('plot "' + file_name + '" using {:d}:{:d} with linespoints linestyle 1 axis x1y2 title "performance",\\'.format(C_SAMPLE, C_CORE))
g_plot('"' + file_name + '" using {:d}:{:d} with linespoints linestyle 2 axis x1y2 title "scaled-busy",\\'.format(C_SAMPLE, C_SCALED))
g_plot('"' + file_name + '" using {:d}:{:d} with linespoints linestyle 3 axis x1y2 title "io-boost",\\'.format(C_SAMPLE, C_BOOST))
g_plot('"' + file_name + '" using {:d}:{:d} with linespoints linestyle 4 axis x1y1 title "P-State"'.format(C_SAMPLE, C_TO))
def plot_perf_busy(cpu_index):
""" Plot some per cpu information """
file_name = 'cpu{:0>3}.csv'.format(cpu_index)
if os.path.exists(file_name):
output_png = "cpu%03d_perf_busy.png" % cpu_index
g_plot = common_all_gnuplot_settings(output_png)
g_plot('set yrange [0:40]')
g_plot('set y2range [0:200]')
g_plot('set y2tics 0, 10')
g_plot('set title "{} : perf busy : CPU {:0>3} : {:%F %H:%M}"'.format(testname, cpu_index, datetime.now()))
g_plot('set ylabel "P-State"')
g_plot('set y2label "Scaled Busy/performance/io-busy(%)"')
set_4_plot_linestyles(g_plot)
g_plot('plot "' + file_name + '" using {:d}:{:d} with linespoints linestyle 1 axis x1y2 title "performance",\\'.format(C_ELAPSED, C_CORE))
g_plot('"' + file_name + '" using {:d}:{:d} with linespoints linestyle 2 axis x1y2 title "scaled-busy",\\'.format(C_ELAPSED, C_SCALED))
g_plot('"' + file_name + '" using {:d}:{:d} with linespoints linestyle 3 axis x1y2 title "io-boost",\\'.format(C_ELAPSED, C_BOOST))
g_plot('"' + file_name + '" using {:d}:{:d} with linespoints linestyle 4 axis x1y1 title "P-State"'.format(C_ELAPSED, C_TO))
def plot_durations(cpu_index):
""" Plot per cpu durations """
file_name = 'cpu{:0>3}.csv'.format(cpu_index)
if os.path.exists(file_name):
output_png = "cpu%03d_durations.png" % cpu_index
g_plot = common_all_gnuplot_settings(output_png)
# Should autoscale be used here? Should seconds be used here?
g_plot('set yrange [0:5000]')
g_plot('set ytics 0, 500')
g_plot('set title "{} : durations : CPU {:0>3} : {:%F %H:%M}"'.format(testname, cpu_index, datetime.now()))
g_plot('set ylabel "Timer Duration (MilliSeconds)"')
# override common
g_plot('set key off')
set_4_plot_linestyles(g_plot)
g_plot('plot "' + file_name + '" using {:d}:{:d} with linespoints linestyle 1 axis x1y1'.format(C_ELAPSED, C_DURATION))
def plot_loads(cpu_index):
""" Plot per cpu loads """
file_name = 'cpu{:0>3}.csv'.format(cpu_index)
if os.path.exists(file_name):
output_png = "cpu%03d_loads.png" % cpu_index
g_plot = common_all_gnuplot_settings(output_png)
g_plot('set yrange [0:100]')
g_plot('set ytics 0, 10')
g_plot('set title "{} : loads : CPU {:0>3} : {:%F %H:%M}"'.format(testname, cpu_index, datetime.now()))
g_plot('set ylabel "CPU load (percent)"')
# override common
g_plot('set key off')
set_4_plot_linestyles(g_plot)
g_plot('plot "' + file_name + '" using {:d}:{:d} with linespoints linestyle 1 axis x1y1'.format(C_ELAPSED, C_LOAD))
def plot_pstate_cpu_with_sample():
""" Plot all cpu information """
if os.path.exists('cpu.csv'):
output_png = 'all_cpu_pstates_vs_samples.png'
g_plot = common_all_gnuplot_settings(output_png)
g_plot('set yrange [0:40]')
# override common
g_plot('set xlabel "Samples"')
g_plot('set ylabel "P-State"')
g_plot('set title "{} : cpu pstate vs. sample : {:%F %H:%M}"'.format(testname, datetime.now()))
title_list = subprocess.check_output('ls cpu???.csv | sed -e \'s/.csv//\'',shell=True).replace('\n', ' ')
plot_str = "plot for [i in title_list] i.'.csv' using {:d}:{:d} pt 7 ps 1 title i".format(C_SAMPLE, C_TO)
g_plot('title_list = "{}"'.format(title_list))
g_plot(plot_str)
def plot_pstate_cpu():
""" Plot all cpu information from csv files """
output_png = 'all_cpu_pstates.png'
g_plot = common_all_gnuplot_settings(output_png)
g_plot('set yrange [0:40]')
g_plot('set ylabel "P-State"')
g_plot('set title "{} : cpu pstates : {:%F %H:%M}"'.format(testname, datetime.now()))
# the following command is really cool, but doesn't work with the CPU masking option because it aborts on the first missing file.
# plot_str = 'plot for [i=0:*] file=sprintf("cpu%03d.csv",i) title_s=sprintf("cpu%03d",i) file using 16:7 pt 7 ps 1 title title_s'
#
title_list = subprocess.check_output('ls cpu???.csv | sed -e \'s/.csv//\'',shell=True).replace('\n', ' ')
plot_str = "plot for [i in title_list] i.'.csv' using {:d}:{:d} pt 7 ps 1 title i".format(C_ELAPSED, C_TO)
g_plot('title_list = "{}"'.format(title_list))
g_plot(plot_str)
def plot_load_cpu():
""" Plot all cpu loads """
output_png = 'all_cpu_loads.png'
g_plot = common_all_gnuplot_settings(output_png)
g_plot('set yrange [0:100]')
g_plot('set ylabel "CPU load (percent)"')
g_plot('set title "{} : cpu loads : {:%F %H:%M}"'.format(testname, datetime.now()))
title_list = subprocess.check_output('ls cpu???.csv | sed -e \'s/.csv//\'',shell=True).replace('\n', ' ')
plot_str = "plot for [i in title_list] i.'.csv' using {:d}:{:d} pt 7 ps 1 title i".format(C_ELAPSED, C_LOAD)
g_plot('title_list = "{}"'.format(title_list))
g_plot(plot_str)
def plot_frequency_cpu():
""" Plot all cpu frequencies """
output_png = 'all_cpu_frequencies.png'
g_plot = common_all_gnuplot_settings(output_png)
g_plot('set yrange [0:4]')
g_plot('set ylabel "CPU Frequency (GHz)"')
g_plot('set title "{} : cpu frequencies : {:%F %H:%M}"'.format(testname, datetime.now()))
title_list = subprocess.check_output('ls cpu???.csv | sed -e \'s/.csv//\'',shell=True).replace('\n', ' ')
plot_str = "plot for [i in title_list] i.'.csv' using {:d}:{:d} pt 7 ps 1 title i".format(C_ELAPSED, C_FREQ)
g_plot('title_list = "{}"'.format(title_list))
g_plot(plot_str)
def plot_duration_cpu():
""" Plot all cpu durations """
output_png = 'all_cpu_durations.png'
g_plot = common_all_gnuplot_settings(output_png)
g_plot('set yrange [0:5000]')
g_plot('set ytics 0, 500')
g_plot('set ylabel "Timer Duration (MilliSeconds)"')
g_plot('set title "{} : cpu durations : {:%F %H:%M}"'.format(testname, datetime.now()))
title_list = subprocess.check_output('ls cpu???.csv | sed -e \'s/.csv//\'',shell=True).replace('\n', ' ')
plot_str = "plot for [i in title_list] i.'.csv' using {:d}:{:d} pt 7 ps 1 title i".format(C_ELAPSED, C_DURATION)
g_plot('title_list = "{}"'.format(title_list))
g_plot(plot_str)
def plot_scaled_cpu():
""" Plot all cpu scaled busy """
output_png = 'all_cpu_scaled.png'
g_plot = common_all_gnuplot_settings(output_png)
# autoscale this one, no set y range
g_plot('set ylabel "Scaled Busy (Unitless)"')
g_plot('set title "{} : cpu scaled busy : {:%F %H:%M}"'.format(testname, datetime.now()))
title_list = subprocess.check_output('ls cpu???.csv | sed -e \'s/.csv//\'',shell=True).replace('\n', ' ')
plot_str = "plot for [i in title_list] i.'.csv' using {:d}:{:d} pt 7 ps 1 title i".format(C_ELAPSED, C_SCALED)
g_plot('title_list = "{}"'.format(title_list))
g_plot(plot_str)
def plot_boost_cpu():
""" Plot all cpu IO Boosts """
output_png = 'all_cpu_boost.png'
g_plot = common_all_gnuplot_settings(output_png)
g_plot('set yrange [0:100]')
g_plot('set ylabel "CPU IO Boost (percent)"')
g_plot('set title "{} : cpu io boost : {:%F %H:%M}"'.format(testname, datetime.now()))
title_list = subprocess.check_output('ls cpu???.csv | sed -e \'s/.csv//\'',shell=True).replace('\n', ' ')
plot_str = "plot for [i in title_list] i.'.csv' using {:d}:{:d} pt 7 ps 1 title i".format(C_ELAPSED, C_BOOST)
g_plot('title_list = "{}"'.format(title_list))
g_plot(plot_str)
def plot_ghz_cpu():
""" Plot all cpu tsc ghz """
output_png = 'all_cpu_ghz.png'
g_plot = common_all_gnuplot_settings(output_png)
# autoscale this one, no set y range
g_plot('set ylabel "TSC Frequency (GHz)"')
g_plot('set title "{} : cpu TSC Frequencies (Sanity check calculation) : {:%F %H:%M}"'.format(testname, datetime.now()))
title_list = subprocess.check_output('ls cpu???.csv | sed -e \'s/.csv//\'',shell=True).replace('\n', ' ')
plot_str = "plot for [i in title_list] i.'.csv' using {:d}:{:d} pt 7 ps 1 title i".format(C_ELAPSED, C_GHZ)
g_plot('title_list = "{}"'.format(title_list))
g_plot(plot_str)
def common_all_gnuplot_settings(output_png):
""" common gnuplot settings for multiple CPUs one one graph. """
g_plot = common_gnuplot_settings()
g_plot('set output "' + output_png + '"')
return(g_plot)
def common_gnuplot_settings():
""" common gnuplot settings. """
g_plot = Gnuplot.Gnuplot(persist=1)
# The following line is for rigor only. It seems to be assumed for .csv files
g_plot('set datafile separator \",\"')
g_plot('set ytics nomirror')
g_plot('set xtics nomirror')
g_plot('set xtics font ", 10"')
g_plot('set ytics font ", 10"')
g_plot('set tics out scale 1.0')
g_plot('set grid')
g_plot('set key out horiz')
g_plot('set key bot center')
g_plot('set key samplen 2 spacing .8 font ", 9"')
g_plot('set term png size 1200, 600')
g_plot('set title font ", 11"')
g_plot('set ylabel font ", 10"')
g_plot('set xlabel font ", 10"')
g_plot('set xlabel offset 0, 0.5')
g_plot('set xlabel "Elapsed Time (Seconds)"')
return(g_plot)
def set_4_plot_linestyles(g_plot):
""" set the linestyles used for 4 plots in 1 graphs. """
g_plot('set style line 1 linetype 1 linecolor rgb "green" pointtype -1')
g_plot('set style line 2 linetype 1 linecolor rgb "red" pointtype -1')
g_plot('set style line 3 linetype 1 linecolor rgb "purple" pointtype -1')
g_plot('set style line 4 linetype 1 linecolor rgb "blue" pointtype -1')
def store_csv(cpu_int, time_pre_dec, time_post_dec, core_busy, scaled, _from, _to, mperf, aperf, tsc, freq_ghz, io_boost, common_comm, load, duration_ms, sample_num, elapsed_time, tsc_ghz):
""" Store master csv file information """
global graph_data_present
if cpu_mask[cpu_int] == 0:
return
try:
f_handle = open('cpu.csv', 'a')
string_buffer = "CPU_%03u, %05u, %06u, %u, %u, %u, %u, %u, %u, %u, %.4f, %u, %.2f, %.3f, %u, %.3f, %.3f, %s\n" % (cpu_int, int(time_pre_dec), int(time_post_dec), int(core_busy), int(scaled), int(_from), int(_to), int(mperf), int(aperf), int(tsc), freq_ghz, int(io_boost), load, duration_ms, sample_num, elapsed_time, tsc_ghz, common_comm)
f_handle.write(string_buffer);
f_handle.close()
except:
print('IO error cpu.csv')
return
graph_data_present = True;
def split_csv():
""" seperate the all csv file into per CPU csv files. """
global current_max_cpu
if os.path.exists('cpu.csv'):
for index in range(0, current_max_cpu + 1):
if cpu_mask[int(index)] != 0:
os.system('grep -m 1 common_cpu cpu.csv > cpu{:0>3}.csv'.format(index))
os.system('grep CPU_{:0>3} cpu.csv >> cpu{:0>3}.csv'.format(index, index))
def cleanup_data_files():
""" clean up existing data files """
if os.path.exists('cpu.csv'):
os.remove('cpu.csv')
f_handle = open('cpu.csv', 'a')
f_handle.write('common_cpu, common_secs, common_usecs, core_busy, scaled_busy, from, to, mperf, aperf, tsc, freq, boost, load, duration_ms, sample_num, elapsed_time, tsc_ghz, common_comm')
f_handle.write('\n')
f_handle.close()
def clear_trace_file():
""" Clear trace file """
try:
f_handle = open('/sys/kernel/debug/tracing/trace', 'w')
f_handle.close()
except:
print('IO error clearing trace file ')
quit()
def enable_trace():
""" Enable trace """
try:
open('/sys/kernel/debug/tracing/events/power/pstate_sample/enable'
, 'w').write("1")
except:
print('IO error enabling trace ')
quit()
def disable_trace():
""" Disable trace """
try:
open('/sys/kernel/debug/tracing/events/power/pstate_sample/enable'
, 'w').write("0")
except:
print('IO error disabling trace ')
quit()
def set_trace_buffer_size():
""" Set trace buffer size """
try:
open('/sys/kernel/debug/tracing/buffer_size_kb'
, 'w').write("10240")
except:
print('IO error setting trace buffer size ')
quit()
def read_trace_data(filename):
""" Read and parse trace data """
global current_max_cpu
global sample_num, last_sec_cpu, last_usec_cpu, start_time
try:
data = open(filename, 'r').read()
except:
print('Error opening ', filename)
quit()
for line in data.splitlines():
search_obj = \
re.search(r'(^(.*?)\[)((\d+)[^\]])(.*?)(\d+)([.])(\d+)(.*?core_busy=)(\d+)(.*?scaled=)(\d+)(.*?from=)(\d+)(.*?to=)(\d+)(.*?mperf=)(\d+)(.*?aperf=)(\d+)(.*?tsc=)(\d+)(.*?freq=)(\d+)'
, line)
if search_obj:
cpu = search_obj.group(3)
cpu_int = int(cpu)
cpu = str(cpu_int)
time_pre_dec = search_obj.group(6)
time_post_dec = search_obj.group(8)
core_busy = search_obj.group(10)
scaled = search_obj.group(12)
_from = search_obj.group(14)
_to = search_obj.group(16)
mperf = search_obj.group(18)
aperf = search_obj.group(20)
tsc = search_obj.group(22)
freq = search_obj.group(24)
common_comm = search_obj.group(2).replace(' ', '')
# Not all kernel versions have io_boost field
io_boost = '0'
search_obj = re.search(r'.*?io_boost=(\d+)', line)
if search_obj:
io_boost = search_obj.group(1)
if sample_num == 0 :
start_time = Decimal(time_pre_dec) + Decimal(time_post_dec) / Decimal(1000000)
sample_num += 1
if last_sec_cpu[cpu_int] == 0 :
last_sec_cpu[cpu_int] = time_pre_dec
last_usec_cpu[cpu_int] = time_post_dec
else :
duration_us = (int(time_pre_dec) - int(last_sec_cpu[cpu_int])) * 1000000 + (int(time_post_dec) - int(last_usec_cpu[cpu_int]))
duration_ms = Decimal(duration_us) / Decimal(1000)
last_sec_cpu[cpu_int] = time_pre_dec
last_usec_cpu[cpu_int] = time_post_dec
elapsed_time = Decimal(time_pre_dec) + Decimal(time_post_dec) / Decimal(1000000) - start_time
load = Decimal(int(mperf)*100)/ Decimal(tsc)
freq_ghz = Decimal(freq)/Decimal(1000000)
# Sanity check calculation, typically anomalies indicate missed samples
# However, check for 0 (should never occur)
tsc_ghz = Decimal(0)
if duration_ms != Decimal(0) :
tsc_ghz = Decimal(tsc)/duration_ms/Decimal(1000000)
store_csv(cpu_int, time_pre_dec, time_post_dec, core_busy, scaled, _from, _to, mperf, aperf, tsc, freq_ghz, io_boost, common_comm, load, duration_ms, sample_num, elapsed_time, tsc_ghz)
if cpu_int > current_max_cpu:
current_max_cpu = cpu_int
# End of for each trace line loop
# Now seperate the main overall csv file into per CPU csv files.
split_csv()
interval = ""
filename = ""
cpu_list = ""
testname = ""
graph_data_present = False;
valid1 = False
valid2 = False
cpu_mask = zeros((MAX_CPUS,), dtype=int)
try:
opts, args = getopt.getopt(sys.argv[1:],"ht:i:c:n:",["help","trace_file=","interval=","cpu=","name="])
except getopt.GetoptError:
print_help()
sys.exit(2)
for opt, arg in opts:
if opt == '-h':
print()
sys.exit()
elif opt in ("-t", "--trace_file"):
valid1 = True
location = os.path.realpath(os.path.join(os.getcwd(), os.path.dirname(__file__)))
filename = os.path.join(location, arg)
elif opt in ("-i", "--interval"):
valid1 = True
interval = arg
elif opt in ("-c", "--cpu"):
cpu_list = arg
elif opt in ("-n", "--name"):
valid2 = True
testname = arg
if not (valid1 and valid2):
print_help()
sys.exit()
if cpu_list:
for p in re.split("[,]", cpu_list):
if int(p) < MAX_CPUS :
cpu_mask[int(p)] = 1
else:
for i in range (0, MAX_CPUS):
cpu_mask[i] = 1
if not os.path.exists('results'):
os.mkdir('results')
os.chdir('results')
if os.path.exists(testname):
print('The test name directory already exists. Please provide a unique test name. Test re-run not supported, yet.')
sys.exit()
os.mkdir(testname)
os.chdir(testname)
# Temporary (or perhaps not)
cur_version = sys.version_info
print('python version (should be >= 2.7):')
print(cur_version)
# Left as "cleanup" for potential future re-run ability.
cleanup_data_files()
if interval:
filename = "/sys/kernel/debug/tracing/trace"
clear_trace_file()
set_trace_buffer_size()
enable_trace()
print('Sleeping for ', interval, 'seconds')
time.sleep(int(interval))
disable_trace()
current_max_cpu = 0
read_trace_data(filename)
if graph_data_present == False:
print('No valid data to plot')
sys.exit(2)
for cpu_no in range(0, current_max_cpu + 1):
plot_perf_busy_with_sample(cpu_no)
plot_perf_busy(cpu_no)
plot_durations(cpu_no)
plot_loads(cpu_no)
plot_pstate_cpu_with_sample()
plot_pstate_cpu()
plot_load_cpu()
plot_frequency_cpu()
plot_duration_cpu()
plot_scaled_cpu()
plot_boost_cpu()
plot_ghz_cpu()
os.chdir('../../')