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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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <errno.h>
#include "power.h"
#include "debugfs.h"
/* XXX Is this exposed through RAPL? */
int power_init(struct power *power)
{
char buf[4096];
int fd, len;
memset(power, 0, sizeof(*power));
sprintf(buf, "%s/i915_energy_uJ", debugfs_dri_path);
fd = open(buf, 0);
if (fd < 0)
return power->error = errno;
len = read(fd, buf, sizeof(buf));
close(fd);
if (len < 0)
return power->error = errno;
return 0;
}
static uint64_t file_to_u64(const char *name)
{
char buf[4096];
int fd, len;
sprintf(buf, "%s/i915_energy_uJ", name);
fd = open(buf, 0);
if (fd < 0)
return 0;
len = read(fd, buf, sizeof(buf)-1);
close(fd);
if (len < 0)
return 0;
buf[len] = '\0';
return strtoull(buf, 0, 0);
}
static uint64_t clock_ms_to_u64(void)
{
struct timespec tv;
if (clock_gettime(CLOCK_MONOTONIC, &tv) < 0)
return 0;
return (uint64_t)tv.tv_sec * 1000 + tv.tv_nsec / 1000000;
}
int power_update(struct power *power)
{
struct power_stat *s = &power->stat[power->count++&1];
struct power_stat *d = &power->stat[power->count&1];
uint64_t d_time;
if (power->error)
return power->error;
s->energy = file_to_u64("i915_energy_uJ");
s->timestamp = clock_ms_to_u64();
if (power->count == 1)
return EAGAIN;
d_time = s->timestamp - d->timestamp;
if (d_time < 900) { /* HW sample rate seems to be stable ~1Hz */
power->count--;
return power->count <= 1 ? EAGAIN : 0;
}
power->power_mW = (s->energy - d->energy) / d_time;
power->new_sample = 1;
return 0;
}
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