pm: add two examples for the power management API
https://jira.digi.com/browse/DEL-6659 Signed-off-by: Francisco Gil <francisco.gilmartinez@digi.com>
This commit is contained in:
Francisco Gil
parent
844d13fec0
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#
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# Copyright 2019, Digi International Inc.
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#
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# Permission to use, copy, modify, and/or distribute this software for any
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# purpose with or without fee is hereby granted, provided that the above
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# copyright notice and this permission notice appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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# AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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# PERFORMANCE OF THIS SOFTWARE.
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#
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BINARYCPU := apix-cpu-example
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BINARYPM := apix-pm-application
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BINARIES := $(BINARYCPU) $(BINARYPM)
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CFLAGS += -Wall -O0
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CFLAGS += $(shell pkg-config --cflags libdigiapix)
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LDLIBS += $(shell pkg-config --libs libdigiapix)
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.PHONY: all
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all: $(BINARIES)
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$(BINARYCPU): apix-cpu-sample.o
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$(CC) $(LDFLAGS) $^ $(LDLIBS) -o $(BINARYCPU)
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$(BINARYPM): apix-pm-sample.o
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$(CC) $(LDFLAGS) $^ $(LDLIBS) -o $(BINARYPM)
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.PHONY: install
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install: $(BINARIES)
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install -d $(DESTDIR)/usr/bin
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install -m 0755 $^ $(DESTDIR)/usr/bin/
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.PHONY: clean
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clean:
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-rm -f *.o $(BINARIES)
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@ -0,0 +1,96 @@
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Digi APIX Power Management example Applications
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===============================================
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Example applications to access and manage CPU functions using the Digi APIX library.
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These applications show how to work with different functions and provide different
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examples to work with the CPU.
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Running the apix-cpu-example application
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-----------------------
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Once the binary is in the target, launch the application:
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```
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# ./apix-cpu-example
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Example application using libdigiapix CPU support
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Usage: apix-cpu-example [options]
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-l List available frequencies
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-s <frequency> Set the desired frequency
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-v Show the current governor
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-g List available governors
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-f <governor> Set the desired governor
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-t List the temperatures of the system
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-c <temperature> Set the critical temperature
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-p <temperature> Set the passive temperature
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-u Get the CPU usage
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-n Get the number of CPU cores
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-d <core_number> Disable the selected core
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-e <core_number> Enable the selected core
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Examples:
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apix-cpu-example -l
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apix-cpu-example -f userspace
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apix-cpu-example -t
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```
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The application needs a valid argument to run, some of the arguments need additional parameters.
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Running the apix-pm-application application
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-----------------------
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Once the binary is in the target, launch the application:
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```
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# ./apix-pm-application
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Example application using libdigiapix power management support.
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This application enables counter measurements in the CPU and GPU
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in order to reduce the temperature.
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Usage: apix-pm-application [options]
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-c Apply CPU counter measurements
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-g Apply GPU counter measurements
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-b Apply CPU & GPU counter measurements
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Examples:
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apix-pm-application -g
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apix-pm-application -b
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```
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This application enables countermeasures in order to reduce the temperature of the CPU.
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If the CPU countermeasures are set, it will select the userspace governor and will set
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the minimum frequency in the device in order to reduce the temperature.
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If the GPU counter measurements are set, it will reduce the GPU scaler to half of its original value.
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Note: Some modules such as CC6UL don't have a GPU.
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Compiling the application
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-------------------------
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This demo can be compiled using a Digi Embedded Yocto based toolchain. Make
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sure to source the corresponding toolchain of the platform you are using,
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for example, for ConnectCore 6UL:
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```
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~$ . <DEY-toolchain-path>/environment-setup-cortexa7hf-vfp-neon-dey-linux-gnueabi
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~$ make
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```
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For more information, see the [Digi Embedded Yocto](https://github.com/digi-embedded/meta-digi).
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License
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-------
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Copyright 2019, Digi International Inc.
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Permission to use, copy, modify, and/or distribute this software for any purpose
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with or without fee is hereby granted, provided that the above copyright notice
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and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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THIS SOFTWARE.
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@ -0,0 +1,213 @@
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/*
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* Copyright 2019, Digi International Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <libgen.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <libdigiapix/pwr_management.h>
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/*
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* usage_and_exit() - Show usage information and exit with 'exitval' return
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* value
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*
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* @name: Application name.
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* @exitval: The exit code.
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*/
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static void usage_and_exit(const char *name, int exitval)
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{
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printf(
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"Example application using libdigiapix power management support\n"
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"\n"
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"Usage: %s [options]\n\n"
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"-l List available frequencies\n"
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"-s <frequency> Set the desired frequency \n"
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"-v Show the current governor\n"
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"-g List available governors\n"
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"-f <governor> Set the desired governor\n"
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"-t List the temperatures of the system\n"
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"-c <temperature> Set the critical temperature in mºC\n"
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"-p <temperature> Set the passive temperature in mºC\n"
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"-u Get the CPU usage\n"
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"-n Get the number of CPU cores\n"
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"-d <core_number> Disable the selected core\n"
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"-e <core_number> Enable the selected core\n"
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"\n"
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"Examples:\n"
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"%s -l\n"
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"%s -f userspace\n"
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"%s -t\n"
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"\n", name, name, name, name);
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exit(exitval);
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}
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/*
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* list_available_governors() - Print the available governors
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*/
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static void list_available_governors()
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{
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int i;
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printf("These are the governors available:\n");
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for (i = 0; i < MAX_GOVERNORS; i++) {
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for (i = 0; i < GOVERNOR_SIZE; i++) {
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if (ldx_cpu_is_governor_available(i) == EXIT_SUCCESS)
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printf("\t\t\t%s\n", ldx_cpu_get_governor_string_from_type(i));
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}
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}
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/*
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* list_temperatures() - Print the available temperatures
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*/
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static void list_temperatures()
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{
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printf("Critical temperature %d mºC\n",
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ldx_cpu_get_critical_trip_point());
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printf("Passive temperature %d mºC\n",
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ldx_cpu_get_passive_trip_point());
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printf("Current temperature %d mºC\n",
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ldx_cpu_get_current_temp());
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}
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/*
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* list_available_frequencies() - Print the available frequencies
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*/
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static void list_available_frequencies()
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{
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int i;
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available_frequencies_t freq = ldx_cpu_get_available_freq();
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printf("These are the available frequencies:\n");
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for (i = 0; i < freq.len; i++) {
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printf("\t\t\t%d\n", freq.data[i]);
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}
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ldx_cpu_free_available_freq(freq);
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}
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int main(int argc, char *argv[])
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{
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char *name = basename(argv[0]);
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const char *governor;
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governor_mode_t governor_mode;
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int ret = EXIT_FAILURE;
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int frequency, temperature, usage, core, opt;
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while ((opt = getopt(argc, argv, "s:f:m:c:d:e:p:gtlunvh ")) > 0) {
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switch (opt) {
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case 'l':
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list_available_frequencies();
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ret = EXIT_SUCCESS;
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break;
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case 's':
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frequency = strtoul(optarg, NULL, 10);
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if (ldx_cpu_set_scaling_freq(frequency) == EXIT_FAILURE) {
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printf("Error setting the scaling frequency to: %d\n", frequency);
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} else {
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ret = EXIT_SUCCESS;
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}
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break;
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case 'g':
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list_available_governors();
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break;
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case 'v':
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governor = ldx_cpu_get_governor_string_from_type(ldx_cpu_get_governor());
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if (governor != NULL){
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printf("This is the current governor: %s\n", governor);
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ret = EXIT_SUCCESS;
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} else {
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printf("Unable to get the current governor");
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}
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break;
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case 'f':
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governor_mode = ldx_cpu_get_governor_type_from_string(optarg);
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if (governor_mode == GOVERNOR_INVALID) {
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printf("Invalid governor: %s", optarg);
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} else {
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if (ldx_cpu_set_governor(governor_mode) == EXIT_FAILURE) {
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printf("Unable to set governor: %s\n", optarg);
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} else {
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ret = EXIT_SUCCESS;
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}
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}
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break;
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case 't':
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list_temperatures();
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ret = EXIT_SUCCESS;
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break;
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case 'c':
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temperature = strtoul(optarg, NULL, 10);
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if (ldx_cpu_set_critical_trip_point(temperature) == EXIT_FAILURE) {
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printf("Unable to set the critical trip point temperature: %d\n", temperature);
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} else {
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ret = EXIT_SUCCESS;
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}
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break;
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case 'p':
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temperature = strtoul(optarg, NULL, 10);
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if (ldx_cpu_set_passive_trip_point(temperature) == EXIT_FAILURE)
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printf("Unable to set the passive trip point temperature: %d\n", temperature);
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else
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ret = EXIT_SUCCESS;
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break;
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case 'u':
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usage = ldx_cpu_get_usage();
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if (usage == -1) {
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printf("Error getting the CPU usage\n");
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} else {
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printf("The usage of the CPU is: %d %%\n", usage);
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ret = EXIT_SUCCESS;
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}
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break;
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case 'n':
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core = ldx_cpu_get_number_of_cores();
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if (core == -1) {
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printf("Error getting the number of cores\n");
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} else {
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printf("The number of CPU cores is: %d\n", core);
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ret = EXIT_SUCCESS;
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}
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break;
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case 'd':
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core = strtoul(optarg, NULL, 10);
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printf("Disabling core: %d\n", core);
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if (ldx_cpu_disable_core(core) == EXIT_FAILURE)
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printf("Cannot disable the core with index: %d\n", core);
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else
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ret = EXIT_SUCCESS;
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break;
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case 'e':
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core = strtoul(optarg, NULL, 10);
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printf("Enabling core: %d\n", core);
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if (ldx_cpu_enable_core(core) == EXIT_FAILURE)
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printf("Cannot enable the core with index: %d\n", core);
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else
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ret = EXIT_SUCCESS;
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break;
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case 'h':
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default:
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usage_and_exit(name, EXIT_FAILURE);
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}
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}
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if (ret == EXIT_FAILURE)
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usage_and_exit(name, ret);
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return ret;
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}
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@ -0,0 +1,214 @@
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/*
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* Copyright 2019, Digi International Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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|
* purpose with or without fee is hereby granted, provided that the above
|
||||||
|
* copyright notice and this permission notice appear in all copies.
|
||||||
|
*
|
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
|
||||||
|
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
|
||||||
|
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
|
||||||
|
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
|
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
|
||||||
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
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|
* PERFORMANCE OF THIS SOFTWARE.
|
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*/
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#include <libgen.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <libdigiapix/pwr_management.h>
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#define CPU_SAMPLING_TIME 6
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#define MAX_SAMPLES 10
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/*
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* usage_and_exit() - Show usage information and exit with 'exitval' return
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* value
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*
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* @name: Application name.
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* @exitval: The exit code.
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*/
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||||||
|
static void usage_and_exit(const char *name, int exitval)
|
||||||
|
{
|
||||||
|
printf(
|
||||||
|
"Example application using libdigiapix power management support. \n"
|
||||||
|
"This application enables counter measurements in the CPU and GPU\n"
|
||||||
|
"in order to reduce the temperature.\n"
|
||||||
|
"\n"
|
||||||
|
"Usage: %s [options]\n\n"
|
||||||
|
"-c Apply CPU counter measurements \n"
|
||||||
|
"-g Apply GPU counter measurements \n"
|
||||||
|
"-b Apply CPU & GPU counter measurements \n"
|
||||||
|
"\n"
|
||||||
|
"Examples:\n"
|
||||||
|
"%s -g\n"
|
||||||
|
"%s -b\n"
|
||||||
|
"\n", name, name, name);
|
||||||
|
|
||||||
|
exit(exitval);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* verify_temperature_reduction() - Print the current temperature during
|
||||||
|
* CPU_SAMPLING_TIME * MAX_SAMPLES seconds
|
||||||
|
*
|
||||||
|
* This function prints the temperature each CPU_SAMPLING_TIME seconds.
|
||||||
|
*
|
||||||
|
* Return: EXIT_SUCCESS on success, EXIT_FAILURE if something fails.
|
||||||
|
*/
|
||||||
|
|
||||||
|
static int verify_temperature_reduction()
|
||||||
|
{
|
||||||
|
int i, temperature;
|
||||||
|
|
||||||
|
printf("Checking if the temperature is being reduced...\n");
|
||||||
|
for (i = 0; i < MAX_SAMPLES; i++) {
|
||||||
|
temperature = ldx_cpu_get_current_temp();
|
||||||
|
|
||||||
|
if (temperature == -1) {
|
||||||
|
printf("Error getting the temperature\n");
|
||||||
|
return EXIT_FAILURE;
|
||||||
|
}
|
||||||
|
|
||||||
|
printf("Current temperature: %d \n", temperature);
|
||||||
|
sleep(CPU_SAMPLING_TIME);
|
||||||
|
}
|
||||||
|
|
||||||
|
return EXIT_SUCCESS;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* apply_countermeasurements() - Apply counter measurements to reduce the temperature
|
||||||
|
*
|
||||||
|
* @gpu: 1 to enable the gpu counter measurements.
|
||||||
|
* @cpu: 1 to enable the cpu counter measurements.
|
||||||
|
*
|
||||||
|
* This function reduces the GPU multiplier to half of its value if
|
||||||
|
* This function reduces the GPU multiplier to half its value if
|
||||||
|
* the gpu value is enabled.
|
||||||
|
*
|
||||||
|
* This function reduces the CPU frequency to the minimum if the cpu value
|
||||||
|
* is enabled.
|
||||||
|
*
|
||||||
|
* Return: EXIT_SUCCESS on success, EXIT_FAILURE if something fails.
|
||||||
|
*/
|
||||||
|
static int apply_countermeasurements(int gpu, int cpu)
|
||||||
|
{
|
||||||
|
governor_mode_t governor;
|
||||||
|
int freq;
|
||||||
|
int ret = EXIT_SUCCESS;
|
||||||
|
int gpu_multiplier;
|
||||||
|
|
||||||
|
if (gpu) {
|
||||||
|
gpu_multiplier = ldx_gpu_get_multiplier();
|
||||||
|
if (gpu_multiplier == -1) {
|
||||||
|
printf("Error getting the gpu multiplier, verify that your platform has a GPU\n");
|
||||||
|
ret = EXIT_FAILURE;
|
||||||
|
goto exit;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (ldx_gpu_set_multiplier(gpu_multiplier / 2) == EXIT_FAILURE) {
|
||||||
|
printf("Error setting the gpu multiplier to %d\n", gpu_multiplier / 2);
|
||||||
|
goto exit;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (cpu) {
|
||||||
|
governor = ldx_cpu_get_governor();
|
||||||
|
|
||||||
|
if (governor == GOVERNOR_INVALID) {
|
||||||
|
printf("Error getting governor\n");
|
||||||
|
ret = EXIT_FAILURE;
|
||||||
|
goto error;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Only with the 'userspace' governor can we modify and manage the frequency */
|
||||||
|
if (ldx_cpu_set_governor(ldx_cpu_get_governor_type_from_string("userspace"))) {
|
||||||
|
printf("Error setting the 'userspace' governor\n");
|
||||||
|
ret = EXIT_FAILURE;
|
||||||
|
goto error;
|
||||||
|
}
|
||||||
|
|
||||||
|
freq = ldx_cpu_get_scaling_freq();
|
||||||
|
|
||||||
|
if (freq == -1) {
|
||||||
|
printf("Error getting the current frequency, restoring the previous governor\n");
|
||||||
|
ret = EXIT_FAILURE;
|
||||||
|
goto error;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (ldx_cpu_set_scaling_freq(ldx_cpu_get_min_scaling_freq()) == EXIT_FAILURE) {
|
||||||
|
printf("Error setting the scaling frequency\n");
|
||||||
|
ret = EXIT_FAILURE;
|
||||||
|
goto error;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
ret = verify_temperature_reduction();
|
||||||
|
|
||||||
|
if (cpu) {
|
||||||
|
/* Restore the frequency */
|
||||||
|
if (ldx_cpu_set_scaling_freq(freq)) {
|
||||||
|
printf("Error restoring the previous frequency\n");
|
||||||
|
ret = EXIT_FAILURE;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
error:
|
||||||
|
|
||||||
|
/* Restore CPU parameters */
|
||||||
|
if (cpu) {
|
||||||
|
if (ldx_cpu_set_governor(governor) == EXIT_FAILURE) {
|
||||||
|
printf("Error restoring the governor\n");
|
||||||
|
ret = EXIT_FAILURE;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Restore GPU parameters */
|
||||||
|
if (gpu) {
|
||||||
|
if (ldx_gpu_set_multiplier(gpu_multiplier)){
|
||||||
|
printf("Error restoring the gpu multiplier\n");
|
||||||
|
ret = EXIT_FAILURE;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
exit:
|
||||||
|
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
int main(int argc, char *argv[])
|
||||||
|
{
|
||||||
|
char *name = basename(argv[0]);
|
||||||
|
int opt;
|
||||||
|
int cpu = 0;
|
||||||
|
int gpu = 0;
|
||||||
|
|
||||||
|
while ((opt = getopt(argc, argv, "gcbh")) > 0) {
|
||||||
|
switch (opt) {
|
||||||
|
case 'g':
|
||||||
|
gpu = 1;
|
||||||
|
printf("Applying GPU counter measurements\n");
|
||||||
|
break;
|
||||||
|
case 'c':
|
||||||
|
cpu = 1;
|
||||||
|
printf("Applying CPU counter measurements\n");
|
||||||
|
break;
|
||||||
|
case 'b':
|
||||||
|
gpu = 1;
|
||||||
|
cpu = 1;
|
||||||
|
printf("Applying GPU & CPU counter measurements\n");
|
||||||
|
break;
|
||||||
|
case 'h':
|
||||||
|
default:
|
||||||
|
usage_and_exit(name, EXIT_FAILURE);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if (cpu == 1 || gpu == 1){
|
||||||
|
return apply_countermeasurements(gpu, cpu);
|
||||||
|
}
|
||||||
|
|
||||||
|
usage_and_exit(name, EXIT_FAILURE);
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue