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/**
* Copyright (C) ARM Limited 2013-2016. 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 "ConfigurationXML.h"
#include "Counter.h"
#include "DriverSource.h"
#include "Logging.h"
#include "SessionData.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);
DriverSource::writeDriver(text, 0);
snprintf(text, sizeof(text), "%s/count", base);
DriverSource::writeDriver(text, 0);
}
closedir(dir);
}
}
static const char ARM_MALI_MIDGARD[] = "ARM_Mali-Midgard_";
static const char ARM_MALI_T[] = "ARM_Mali-T";
void KMod::setupCounter(Counter &counter) {
char base[128];
char text[128];
snprintf(base, sizeof(base), "/dev/gator/events/%s", counter.getType());
if ((strncmp(counter.getType(), ARM_MALI_MIDGARD, sizeof(ARM_MALI_MIDGARD) - 1) == 0 ||
strncmp(counter.getType(), ARM_MALI_T, sizeof(ARM_MALI_T) - 1) == 0)) {
mIsMaliCapture = true;
}
snprintf(text, sizeof(text), "%s/enabled", base);
int enabled = true;
if (DriverSource::writeReadDriver(text, &enabled) || !enabled) {
counter.setEnabled(false);
return;
}
int value = 0;
snprintf(text, sizeof(text), "%s/key", base);
DriverSource::readIntDriver(text, &value);
counter.setKey(value);
snprintf(text, sizeof(text), "%s/cores", base);
if (DriverSource::readIntDriver(text, &value) == 0) {
counter.setCores(value);
}
snprintf(text, sizeof(text), "%s/event", base);
DriverSource::writeDriver(text, counter.getEvent());
snprintf(text, sizeof(text), "%s/count", base);
if (access(text, F_OK) == 0) {
int count = counter.getCount();
if (DriverSource::writeReadDriver(text, &count) && counter.getCount() > 0) {
logg.logError("Cannot enable EBS for %s:%i with a count of %d", counter.getType(), counter.getEvent(), counter.getCount());
handleException();
}
counter.setCount(count);
} else if (counter.getCount() > 0) {
ConfigurationXML::remove();
logg.logError("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.");
handleException();
}
}
int 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) {
return 0;
}
int count = 0;
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);
++count;
}
closedir(dir);
return count;
}
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