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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 <sys/stat.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <errno.h>
#include "rc6.h"
int rc6_init(struct rc6 *rc6)
{
struct stat st;
int fd;
memset(rc6, 0, sizeof(*rc6));
fd = stat("/sys/class/drm/card0/power", &st);
if (fd == -1)
return rc6->error = errno;
return 0;
}
static uint64_t file_to_u64(const char *path)
{
char buf[4096];
int fd, len;
fd = open(path, 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 rc6_update(struct rc6 *rc6)
{
struct rc6_stat *s = &rc6->stat[rc6->count++&1];
struct rc6_stat *d = &rc6->stat[rc6->count&1];
uint64_t d_time, d_rc6, d_rc6p, d_rc6pp;
struct stat st;
if (rc6->error)
return rc6->error;
if (stat("/sys/class/drm/card0/power/rc6_residency_ms", &st) < 0)
return rc6->error = ENOENT;
rc6->enabled = file_to_u64("/sys/class/drm/card0/power/rc6_enable");
if (rc6->enabled == 0)
return EAGAIN;
s->rc6_residency = file_to_u64("/sys/class/drm/card0/power/rc6_residency_ms");
s->rc6p_residency = file_to_u64("/sys/class/drm/card0/power/rc6p_residency_ms");
s->rc6pp_residency = file_to_u64("/sys/class/drm/card0/power/rc6pp_residency_ms");
s->timestamp = clock_ms_to_u64();
if (rc6->count == 1)
return EAGAIN;
d_time = s->timestamp - d->timestamp;
d_rc6 = s->rc6_residency - d->rc6_residency;
rc6->rc6 = 100 * d_rc6 / d_time;
d_rc6p = s->rc6p_residency - d->rc6p_residency;
rc6->rc6p = 100 * d_rc6p / d_time;
d_rc6pp = s->rc6pp_residency - d->rc6pp_residency;
rc6->rc6pp = 100 * d_rc6pp / d_time;
rc6->rc6_combined = 100 * (d_rc6 + d_rc6p + d_rc6pp) / d_time;
return 0;
}
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