mirror of
https://github.com/tiagovignatti/intel-gpu-tools.git
synced 2025-06-10 09:26:10 +00:00
87 lines
1.5 KiB
C
87 lines
1.5 KiB
C
#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 < 1200) { /* 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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