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Add helpers for getting RAPL power data from Intel CPUs
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165
common/common-power.c
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165
common/common-power.c
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/*
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Copyright (c) 2017-2019, Feral Interactive
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Copyright (c) 2019, Intel Corporation
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Feral Interactive nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#define _GNU_SOURCE
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#include "common-power.h"
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#include "common-logging.h"
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#include <assert.h>
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#include <ctype.h>
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#include <glob.h>
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#include <linux/limits.h>
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#include <stdio.h>
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#include <string.h>
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static bool read_file_in_dir(const char *dir, const char *file, char *dest, size_t n)
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{
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char path[PATH_MAX];
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int ret = snprintf(path, sizeof(path), "%s/%s", dir, file);
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if (ret < 0 || ret >= (int)sizeof(path)) {
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LOG_ERROR("Path length overrun");
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return false;
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}
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FILE *f = fopen(path, "r");
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if (!f) {
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LOG_ERROR("Failed to open file for read %s\n", path);
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return false;
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}
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size_t read = fread(dest, 1, n, f);
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/* Close before we do any error checking */
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fclose(f);
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if (read <= 0) {
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LOG_ERROR("Failed to read contents of %s: (%s)\n", path, strerror(errno));
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return false;
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}
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if (read >= n) {
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LOG_ERROR("File contained more data than expected %s\n", path);
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return false;
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}
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/* Ensure we're null terminated */
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dest[read] = '\0';
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/* Trim whitespace off the end */
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while (read > 0 && isspace(dest[read - 1])) {
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dest[read - 1] = '\0';
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read--;
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}
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return true;
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}
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static bool get_energy_uj(const char *rapl_name, uint32_t *energy_uj)
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{
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glob_t glo = { 0 };
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static const char *path = "/sys/class/powercap/intel-rapl/intel-rapl:0/intel-rapl:0:*";
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/* Assert some sanity on this glob */
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if (glob(path, GLOB_NOSORT, NULL, &glo) != 0) {
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LOG_ERROR("glob failed for RAPL paths: (%s)\n", strerror(errno));
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return false;
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}
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/* If the glob doesn't find anything, this most likely means we don't
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* have an Intel CPU or we have a kernel which does not support RAPL on
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* our CPU.
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*/
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if (glo.gl_pathc < 1) {
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LOG_ONCE(MSG,
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"Intel RAPL interface not found in sysfs. "
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"This is only problematic if you expected Intel iGPU "
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"power threshold optimization.");
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globfree(&glo);
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return false;
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}
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/* Walk the glob set */
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for (size_t i = 0; i < glo.gl_pathc; i++) {
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char name[32];
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if (!read_file_in_dir(glo.gl_pathv[i], "name", name, sizeof(name))) {
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return false;
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}
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/* We're searching for the directory where the file named "name"
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* contains the contents rapl_name. */
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if (strncmp(name, rapl_name, sizeof(name)) != 0) {
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continue;
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}
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char energy_uj_str[32];
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if (!read_file_in_dir(glo.gl_pathv[i], "energy_uj", energy_uj_str, sizeof(energy_uj_str))) {
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return false;
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}
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char *end = NULL;
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long long energy_uj_ll = strtoll(energy_uj_str, &end, 10);
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if (end == energy_uj_str) {
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LOG_ERROR("Invalid energy_uj contents: %s\n", energy_uj_str);
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return false;
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}
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if (energy_uj_ll < 0) {
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LOG_ERROR("Value of energy_uj is out of expected bounds: %lld\n", energy_uj_ll);
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return false;
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}
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/* Go ahead and clamp to 32 bits. We assume 32 bits later when
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* taking deltas and wrapping at 32 bits is exactly what the Linux
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* kernel's turbostat utility does so it's probably right.
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*/
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*energy_uj = (uint32_t)energy_uj_ll;
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return true;
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}
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/* If we got here then the CPU and Kernel support RAPL and all our file
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* access has succeeded but we failed to find an entry with the right
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* name. This most likely means we're asking for "uncore" but are on a
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* machine that doesn't have an integrated GPU.
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*/
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return false;
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}
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bool get_cpu_energy_uj(uint32_t *energy_uj)
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{
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return get_energy_uj("core", energy_uj);
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}
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bool get_igpu_energy_uj(uint32_t *energy_uj)
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{
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return get_energy_uj("uncore", energy_uj);
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}
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45
common/common-power.h
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45
common/common-power.h
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@ -0,0 +1,45 @@
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/*
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Copyright (c) 2017-2019, Feral Interactive
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
|
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|
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* Redistributions of source code must retain the above copyright notice,
|
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this list of conditions and the following disclaimer.
|
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* Redistributions in binary form must reproduce the above copyright
|
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notice, this list of conditions and the following disclaimer in the
|
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documentation and/or other materials provided with the distribution.
|
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* Neither the name of Feral Interactive nor the names of its contributors
|
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may be used to endorse or promote products derived from this software
|
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without specific prior written permission.
|
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|
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <stdbool.h>
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#include <stdint.h>
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/**
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* Get the amount of energy used to date by the CPU in microjoules
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*/
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bool get_cpu_energy_uj(uint32_t *energy_uj);
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/**
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* Get the amount of energy used to date by the integrated GPU in microjoules
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*/
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bool get_igpu_energy_uj(uint32_t *energy_uj);
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@ -6,6 +6,7 @@ common_sources = [
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'common-helpers.c',
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'common-gpu.c',
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'common-pidfds.c',
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'common-power.c',
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]
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daemon_common = static_library(
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