| /* |
| * 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 <stdint.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <time.h> |
| #include <errno.h> |
| #include <ctype.h> |
| #include <locale.h> |
| #include <math.h> |
| |
| #include "igt_perf.h" |
| |
| #include "power.h" |
| #include "debugfs.h" |
| |
| static int |
| filename_to_buf(const char *filename, char *buf, unsigned int bufsize) |
| { |
| int fd; |
| ssize_t ret; |
| |
| fd = open(filename, O_RDONLY); |
| if (fd < 0) |
| return -1; |
| |
| ret = read(fd, buf, bufsize - 1); |
| close(fd); |
| if (ret < 1) |
| return -1; |
| |
| buf[ret] = '\0'; |
| |
| return 0; |
| } |
| |
| static uint64_t filename_to_u64(const char *filename, int base) |
| { |
| char buf[64], *b; |
| |
| if (filename_to_buf(filename, buf, sizeof(buf))) |
| return 0; |
| |
| /* |
| * Handle both single integer and key=value formats by skipping |
| * leading non-digits. |
| */ |
| b = buf; |
| while (*b && !isdigit(*b)) |
| b++; |
| |
| return strtoull(b, NULL, base); |
| } |
| |
| static uint64_t rapl_type_id(void) |
| { |
| return filename_to_u64("/sys/devices/power/type", 10); |
| } |
| |
| static uint64_t rapl_gpu_power(void) |
| { |
| return filename_to_u64("/sys/devices/power/events/energy-gpu", 0); |
| } |
| |
| static uint64_t rapl_pkg_power(void) |
| { |
| return filename_to_u64("/sys/devices/power/events/energy-pkg", 0); |
| } |
| |
| static double filename_to_double(const char *filename) |
| { |
| char *oldlocale; |
| char buf[80]; |
| double v; |
| |
| if (filename_to_buf(filename, buf, sizeof(buf))) |
| return 0; |
| |
| oldlocale = setlocale(LC_ALL, "C"); |
| v = strtod(buf, NULL); |
| setlocale(LC_ALL, oldlocale); |
| |
| return v; |
| } |
| |
| static double rapl_gpu_power_scale(void) |
| { |
| return filename_to_double("/sys/devices/power/events/energy-gpu.scale"); |
| } |
| |
| static double rapl_pkg_power_scale(void) |
| { |
| return filename_to_double("/sys/devices/power/events/energy-pkg.scale"); |
| } |
| |
| int power_init(struct power *power) |
| { |
| memset(power, 0, sizeof(*power)); |
| |
| power->gpu.fd = igt_perf_open(rapl_type_id(), rapl_gpu_power()); |
| if (power->gpu.fd < 0) |
| return power->error = ENOENT; |
| power->gpu.scale = rapl_gpu_power_scale() * 1e3; /* to milli */ |
| |
| power->pkg.fd = igt_perf_open(rapl_type_id(), rapl_pkg_power()); |
| power->pkg.scale = rapl_pkg_power_scale() *1e3; /* to milli */ |
| |
| return 0; |
| } |
| |
| static void __power_update(struct power_domain *pd, int count) |
| { |
| struct power_stat *s = &pd->stat[count & 1]; |
| struct power_stat *d = &pd->stat[(count + 1) & 1]; |
| uint64_t data[2], d_time; |
| int len; |
| |
| len = read(pd->fd, data, sizeof(data)); |
| if (len != sizeof(data)) |
| return; |
| |
| s->energy = llround((double)data[0] * pd->scale); |
| s->timestamp = data[1]; |
| |
| if (!count) |
| return; |
| |
| d_time = s->timestamp - d->timestamp; |
| pd->power_mW = round((s->energy - d->energy) * 1e9 / d_time); |
| pd->new_sample = 1; |
| } |
| |
| int power_update(struct power *power) |
| { |
| if (power->error) |
| return power->error; |
| |
| __power_update(&power->gpu, power->count); |
| __power_update(&power->pkg, power->count); |
| |
| if (!power->count++) |
| return EAGAIN; |
| |
| return 0; |
| } |