mirror of
https://github.com/tiagovignatti/intel-gpu-tools.git
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111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/*
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* Copyright © 2013 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <time.h>
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#include <errno.h>
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#include "power.h"
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/* XXX Is this exposed through RAPL? */
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int power_init(struct power *power)
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{
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char buf[4096];
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int fd, len;
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memset(power, 0, sizeof(*power));
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fd = open("/sys/kernel/debug/dri/0/i915_energy_uJ", 0);
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if (fd < 0)
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return power->error = errno;
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len = read(fd, buf, sizeof(buf));
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close(fd);
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if (len < 0)
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return power->error = errno;
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return 0;
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}
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static uint64_t file_to_u64(const char *path)
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{
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char buf[4096];
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int fd, len;
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fd = open(path, 0);
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if (fd < 0)
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return 0;
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len = read(fd, buf, sizeof(buf)-1);
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close(fd);
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if (len < 0)
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return 0;
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buf[len] = '\0';
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return strtoull(buf, 0, 0);
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}
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static uint64_t clock_ms_to_u64(void)
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{
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struct timespec tv;
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if (clock_gettime(CLOCK_MONOTONIC, &tv) < 0)
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return 0;
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return (uint64_t)tv.tv_sec * 1000 + tv.tv_nsec / 1000000;
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}
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int power_update(struct power *power)
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{
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struct power_stat *s = &power->stat[power->count++&1];
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struct power_stat *d = &power->stat[power->count&1];
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uint64_t d_time;
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if (power->error)
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return power->error;
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s->energy = file_to_u64("/sys/kernel/debug/dri/0/i915_energy_uJ");
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s->timestamp = clock_ms_to_u64();
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if (power->count == 1)
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return EAGAIN;
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d_time = s->timestamp - d->timestamp;
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if (d_time < 900) { /* HW sample rate seems to be stable ~1Hz */
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power->count--;
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return power->count <= 1 ? EAGAIN : 0;
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}
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power->power_mW = (s->energy - d->energy) / d_time;
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power->new_sample = 1;
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return 0;
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}
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