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/*
* trace.c
*
* Copyright (C) 2014 Zoran Markovic <zoran.markovic@linaro.org>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <string.h>
#include "trace.h"
#include "utils.h"
int idlestat_trace_enable(bool enable)
{
return write_int(TRACE_ON_PATH, enable);
}
int idlestat_flush_trace(void)
{
return write_int(TRACE_FILE, 0);
}
int idlestat_init_trace(unsigned int duration)
{
int bufsize;
/* Assuming the worst case where we can have
* TRACE_IDLE_NRHITS_PER_SEC. Each state enter/exit line are
* 196 chars wide, so we have 2 x 196 x TRACE_IDLE_NRHITS_PER_SEC bytes.
* divided by 2^10 to have Kb. We add 1Kb to be sure to round up.
*/
bufsize = 2 * TRACE_IDLE_LENGTH * TRACE_IDLE_NRHITS_PER_SEC * duration;
bufsize = (bufsize / (1 << 10)) + 1;
if (write_int(TRACE_BUFFER_SIZE_PATH, bufsize))
return -1;
if (read_int(TRACE_BUFFER_TOTAL_PATH, &bufsize))
return -1;
printf("Total trace buffer: %d kB\n", bufsize);
/* Disable all the traces */
if (write_int(TRACE_EVENT_PATH, 0))
return -1;
/* Enable cpu_idle traces */
if (write_int(TRACE_CPUIDLE_EVENT_PATH, 1))
return -1;
/* Enable irq traces */
if (write_int(TRACE_IRQ_EVENT_PATH, 1))
return -1;
return 0;
}
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