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/*
* Copyright © 2013 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <errno.h>
#include <ctype.h>
#include <locale.h>
#include <math.h>
#include "igt_perf.h"
#include "power.h"
#include "debugfs.h"
static int
filename_to_buf(const char *filename, char *buf, unsigned int bufsize)
{
int fd;
ssize_t ret;
fd = open(filename, O_RDONLY);
if (fd < 0)
return -1;
ret = read(fd, buf, bufsize - 1);
close(fd);
if (ret < 1)
return -1;
buf[ret] = '\0';
return 0;
}
static uint64_t filename_to_u64(const char *filename, int base)
{
char buf[64], *b;
if (filename_to_buf(filename, buf, sizeof(buf)))
return 0;
/*
* Handle both single integer and key=value formats by skipping
* leading non-digits.
*/
b = buf;
while (*b && !isdigit(*b))
b++;
return strtoull(b, NULL, base);
}
static uint64_t rapl_type_id(void)
{
return filename_to_u64("/sys/devices/power/type", 10);
}
static uint64_t rapl_gpu_power(void)
{
return filename_to_u64("/sys/devices/power/events/energy-gpu", 0);
}
static uint64_t rapl_pkg_power(void)
{
return filename_to_u64("/sys/devices/power/events/energy-pkg", 0);
}
static double filename_to_double(const char *filename)
{
char *oldlocale;
char buf[80];
double v;
if (filename_to_buf(filename, buf, sizeof(buf)))
return 0;
oldlocale = setlocale(LC_ALL, "C");
v = strtod(buf, NULL);
setlocale(LC_ALL, oldlocale);
return v;
}
static double rapl_gpu_power_scale(void)
{
return filename_to_double("/sys/devices/power/events/energy-gpu.scale");
}
static double rapl_pkg_power_scale(void)
{
return filename_to_double("/sys/devices/power/events/energy-pkg.scale");
}
int power_init(struct power *power)
{
memset(power, 0, sizeof(*power));
power->gpu.fd = igt_perf_open(rapl_type_id(), rapl_gpu_power());
if (power->gpu.fd < 0)
return power->error = ENOENT;
power->gpu.scale = rapl_gpu_power_scale() * 1e3; /* to milli */
power->pkg.fd = igt_perf_open(rapl_type_id(), rapl_pkg_power());
power->pkg.scale = rapl_pkg_power_scale() *1e3; /* to milli */
return 0;
}
static void __power_update(struct power_domain *pd, int count)
{
struct power_stat *s = &pd->stat[count & 1];
struct power_stat *d = &pd->stat[(count + 1) & 1];
uint64_t data[2], d_time;
int len;
len = read(pd->fd, data, sizeof(data));
if (len != sizeof(data))
return;
s->energy = llround((double)data[0] * pd->scale);
s->timestamp = data[1];
if (!count)
return;
d_time = s->timestamp - d->timestamp;
pd->power_mW = round((s->energy - d->energy) * 1e9 / d_time);
pd->new_sample = 1;
}
int power_update(struct power *power)
{
if (power->error)
return power->error;
__power_update(&power->gpu, power->count);
__power_update(&power->pkg, power->count);
if (!power->count++)
return EAGAIN;
return 0;
}
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