blob: 559297fe2274dd99780df1549fab53733d8e7c48 [file] [log] [blame]
/**
* Copyright (C) ARM Limited 2013. All rights reserved.
*
* 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.
*/
#include "KMod.h"
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#include "Collector.h"
#include "ConfigurationXML.h"
#include "Counter.h"
#include "Logging.h"
// Claim all the counters in /dev/gator/events
bool KMod::claimCounter(const Counter &counter) const {
char text[128];
snprintf(text, sizeof(text), "/dev/gator/events/%s", counter.getType());
return access(text, F_OK) == 0;
}
void KMod::resetCounters() {
char base[128];
char text[128];
// Initialize all perf counters in the driver, i.e. set enabled to zero
struct dirent *ent;
DIR* dir = opendir("/dev/gator/events");
if (dir) {
while ((ent = readdir(dir)) != NULL) {
// skip hidden files, current dir, and parent dir
if (ent->d_name[0] == '.')
continue;
snprintf(base, sizeof(base), "/dev/gator/events/%s", ent->d_name);
snprintf(text, sizeof(text), "%s/enabled", base);
Collector::writeDriver(text, 0);
snprintf(text, sizeof(text), "%s/count", base);
Collector::writeDriver(text, 0);
}
closedir(dir);
}
}
void KMod::setupCounter(Counter &counter) {
char base[128];
char text[128];
snprintf(base, sizeof(base), "/dev/gator/events/%s", counter.getType());
snprintf(text, sizeof(text), "%s/enabled", base);
int enabled = true;
if (Collector::writeReadDriver(text, &enabled) || !enabled) {
counter.setEnabled(false);
return;
}
snprintf(text, sizeof(text), "%s/key", base);
int key = 0;
Collector::readIntDriver(text, &key);
counter.setKey(key);
snprintf(text, sizeof(text), "%s/event", base);
Collector::writeDriver(text, counter.getEvent());
snprintf(text, sizeof(text), "%s/count", base);
if (access(text, F_OK) == 0) {
int count = counter.getCount();
if (Collector::writeReadDriver(text, &count) && counter.getCount() > 0) {
logg->logError(__FILE__, __LINE__, "Cannot enable EBS for %s:%i with a count of %d\n", counter.getType(), counter.getEvent(), counter.getCount());
handleException();
}
counter.setCount(count);
} else if (counter.getCount() > 0) {
ConfigurationXML::remove();
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");
handleException();
}
}
void KMod::writeCounters(mxml_node_t *root) const {
struct dirent *ent;
mxml_node_t *counter;
// counters.xml is simply a file listing of /dev/gator/events
DIR* dir = opendir("/dev/gator/events");
if (dir == NULL) {
logg->logError(__FILE__, __LINE__, "Cannot create counters.xml since unable to read /dev/gator/events");
handleException();
}
while ((ent = readdir(dir)) != NULL) {
// skip hidden files, current dir, and parent dir
if (ent->d_name[0] == '.')
continue;
counter = mxmlNewElement(root, "counter");
mxmlElementSetAttr(counter, "name", ent->d_name);
}
closedir(dir);
}