132 lines
3.3 KiB
C
132 lines
3.3 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 <sys/stat.h>
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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 "igt_perf.h"
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#include "rc6.h"
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int rc6_init(struct rc6 *rc6)
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{
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memset(rc6, 0, sizeof(*rc6));
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rc6->fd = perf_i915_open(I915_PMU_RC6_RESIDENCY);
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if (rc6->fd < 0) {
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struct stat st;
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if (stat("/sys/class/drm/card0/power", &st) < 0)
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return rc6->error = errno;
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}
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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 -1;
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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 -1;
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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 rc6_update(struct rc6 *rc6)
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{
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struct rc6_stat *s = &rc6->stat[rc6->count++&1];
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struct rc6_stat *d = &rc6->stat[rc6->count&1];
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uint64_t d_time, d_rc6, d_rc6p, d_rc6pp;
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if (rc6->error)
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return rc6->error;
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if (rc6->fd < 0) {
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struct stat st;
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if (stat("/sys/class/drm/card0/power/rc6_residency_ms", &st) < 0)
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return rc6->error = ENOENT;
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s->rc6_residency = file_to_u64("/sys/class/drm/card0/power/rc6_residency_ms");
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s->rc6p_residency = file_to_u64("/sys/class/drm/card0/power/rc6p_residency_ms");
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s->rc6pp_residency = file_to_u64("/sys/class/drm/card0/power/rc6pp_residency_ms");
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s->timestamp = clock_ms_to_u64();
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} else {
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uint64_t data[2];
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if (read(rc6->fd, data, sizeof(data)) < sizeof(data))
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return rc6->error = errno;
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s->timestamp = data[1] / 1e6;
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s->rc6_residency = data[0] / 1e6;
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}
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if (rc6->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 == 0) {
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rc6->count--;
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return EAGAIN;
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}
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d_rc6 = s->rc6_residency - d->rc6_residency;
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rc6->rc6 = 100 * d_rc6 / d_time;
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d_rc6p = s->rc6p_residency - d->rc6p_residency;
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rc6->rc6p = 100 * d_rc6p / d_time;
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d_rc6pp = s->rc6pp_residency - d->rc6pp_residency;
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rc6->rc6pp = 100 * d_rc6pp / d_time;
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rc6->rc6_combined = 100 * (d_rc6 + d_rc6p + d_rc6pp) / d_time;
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return 0;
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}
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