120 lines
3.5 KiB
C++
120 lines
3.5 KiB
C++
/**
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* Copyright (C) ARM Limited 2013-2014. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include "KMod.h"
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#include <sys/types.h>
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#include <dirent.h>
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#include <unistd.h>
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#include "ConfigurationXML.h"
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#include "Counter.h"
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#include "DriverSource.h"
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#include "Logging.h"
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#include "SessionData.h"
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// Claim all the counters in /dev/gator/events
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bool KMod::claimCounter(const Counter &counter) const {
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char text[128];
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snprintf(text, sizeof(text), "/dev/gator/events/%s", counter.getType());
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return access(text, F_OK) == 0;
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}
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void KMod::resetCounters() {
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char base[128];
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char text[128];
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// Initialize all perf counters in the driver, i.e. set enabled to zero
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struct dirent *ent;
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DIR* dir = opendir("/dev/gator/events");
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if (dir) {
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while ((ent = readdir(dir)) != NULL) {
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// skip hidden files, current dir, and parent dir
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if (ent->d_name[0] == '.')
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continue;
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snprintf(base, sizeof(base), "/dev/gator/events/%s", ent->d_name);
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snprintf(text, sizeof(text), "%s/enabled", base);
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DriverSource::writeDriver(text, 0);
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snprintf(text, sizeof(text), "%s/count", base);
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DriverSource::writeDriver(text, 0);
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}
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closedir(dir);
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}
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}
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static const char ARM_MALI_MIDGARD[] = "ARM_Mali-Midgard_";
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static const char ARM_MALI_T[] = "ARM_Mali-T";
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void KMod::setupCounter(Counter &counter) {
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char base[128];
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char text[128];
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snprintf(base, sizeof(base), "/dev/gator/events/%s", counter.getType());
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if ((strncmp(counter.getType(), ARM_MALI_MIDGARD, sizeof(ARM_MALI_MIDGARD) - 1) == 0 ||
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strncmp(counter.getType(), ARM_MALI_T, sizeof(ARM_MALI_T) - 1) == 0)) {
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mIsMaliCapture = true;
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}
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snprintf(text, sizeof(text), "%s/enabled", base);
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int enabled = true;
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if (DriverSource::writeReadDriver(text, &enabled) || !enabled) {
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counter.setEnabled(false);
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return;
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}
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int value = 0;
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snprintf(text, sizeof(text), "%s/key", base);
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DriverSource::readIntDriver(text, &value);
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counter.setKey(value);
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snprintf(text, sizeof(text), "%s/cores", base);
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if (DriverSource::readIntDriver(text, &value) == 0) {
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counter.setCores(value);
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}
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snprintf(text, sizeof(text), "%s/event", base);
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DriverSource::writeDriver(text, counter.getEvent());
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snprintf(text, sizeof(text), "%s/count", base);
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if (access(text, F_OK) == 0) {
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int count = counter.getCount();
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if (DriverSource::writeReadDriver(text, &count) && counter.getCount() > 0) {
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logg->logError(__FILE__, __LINE__, "Cannot enable EBS for %s:%i with a count of %d\n", counter.getType(), counter.getEvent(), counter.getCount());
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handleException();
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}
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counter.setCount(count);
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} else if (counter.getCount() > 0) {
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ConfigurationXML::remove();
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logg->logError(__FILE__, __LINE__, "Event Based Sampling is only supported with kernel versions 3.0.0 and higher with CONFIG_PERF_EVENTS=y, and CONFIG_HW_PERF_EVENTS=y. The invalid configuration.xml has been removed.\n");
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handleException();
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}
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}
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int KMod::writeCounters(mxml_node_t *root) const {
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struct dirent *ent;
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mxml_node_t *counter;
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// counters.xml is simply a file listing of /dev/gator/events
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DIR* dir = opendir("/dev/gator/events");
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if (dir == NULL) {
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return 0;
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}
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int count = 0;
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while ((ent = readdir(dir)) != NULL) {
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// skip hidden files, current dir, and parent dir
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if (ent->d_name[0] == '.')
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continue;
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counter = mxmlNewElement(root, "counter");
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mxmlElementSetAttr(counter, "name", ent->d_name);
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++count;
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}
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closedir(dir);
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return count;
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}
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