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/*
* Copyright © 2012 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.
*
* Authors:
* Ben Widawsky <ben@bwidawsk.net>
*
*/
#include "igt.h"
#include "igt_sysfs.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
#define SLEEP_DURATION 3 /* in seconds */
#define RC6_ENABLED 1
#define RC6P_ENABLED 2
#define RC6PP_ENABLED 4
static int sysfs;
struct residencies {
int rc6;
int media_rc6;
int rc6p;
int rc6pp;
int duration;
};
static unsigned long get_rc6_enabled_mask(void)
{
unsigned long rc6_mask;
rc6_mask = 0;
igt_sysfs_scanf(sysfs, "power/rc6_enable", "%lu", &rc6_mask);
return rc6_mask;
}
static unsigned long read_rc6_residency(const char *name)
{
unsigned long residency;
char path[128];
residency = 0;
sprintf(path, "power/%s_residency_ms", name);
igt_assert(igt_sysfs_scanf(sysfs, path, "%lu", &residency) == 1);
return residency;
}
static void residency_accuracy(unsigned int diff,
unsigned int duration,
const char *name_of_rc6_residency)
{
double ratio;
ratio = (double)diff / duration;
igt_info("Residency in %s or deeper state: %u ms (sleep duration %u ms) (%.1f%% of expected duration)\n",
name_of_rc6_residency, diff, duration, 100*ratio);
igt_assert_f(ratio > 0.9 && ratio < 1.05,
"Sysfs RC6 residency counter is inaccurate.\n");
}
static void read_residencies(int devid, unsigned int rc6_mask,
struct residencies *res)
{
if (rc6_mask & RC6_ENABLED)
res->rc6 = read_rc6_residency("rc6");
if ((rc6_mask & RC6_ENABLED) &&
(IS_VALLEYVIEW(devid) || IS_CHERRYVIEW(devid)))
res->media_rc6 = read_rc6_residency("media_rc6");
if (rc6_mask & RC6P_ENABLED)
res->rc6p = read_rc6_residency("rc6p");
if (rc6_mask & RC6PP_ENABLED)
res->rc6pp = read_rc6_residency("rc6pp");
}
static unsigned long gettime_ms(void)
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
}
static void measure_residencies(int devid, unsigned int rc6_mask,
struct residencies *res)
{
struct residencies start = { };
struct residencies end = { };
int retry;
unsigned long t;
if (!rc6_mask)
return;
/*
* For some reason my ivb isn't idle even after syncing up with the gpu.
* Let's add a sleep just to make it happy.
*/
sleep(8);
/*
* Retry in case of counter wrap-around. We simply re-run the
* measurement, since the valid counter range is different on
* different platforms and so fixing it up would be non-trivial.
*/
for (retry = 0; retry < 2; retry++) {
t = gettime_ms();
read_residencies(devid, rc6_mask, &start);
sleep(SLEEP_DURATION);
read_residencies(devid, rc6_mask, &end);
t = gettime_ms() - t;
if (end.rc6 >= start.rc6 && end.media_rc6 >= start.media_rc6 &&
end.rc6p >= start.rc6p && end.rc6pp >= start.rc6pp)
break;
}
igt_assert_f(retry < 2, "residency values are not consistent\n");
res->rc6 = end.rc6 - start.rc6;
res->rc6p = end.rc6p - start.rc6p;
res->rc6pp = end.rc6pp - start.rc6pp;
res->media_rc6 = end.media_rc6 - start.media_rc6;
res->duration = t;
/*
* For the purposes of this test case we want a given residency value
* to include the time spent in the corresponding RC state _and_ also
* the time spent in any enabled deeper states. So for example if any
* of RC6P or RC6PP is enabled we want the time spent in these states
* to be also included in the RC6 residency value. The kernel reported
* residency values are exclusive, so add up things here.
*/
res->rc6p += res->rc6pp;
res->rc6 += res->rc6p;
}
igt_main
{
unsigned int rc6_mask;
int devid = 0;
struct residencies res;
igt_skip_on_simulation();
/* Use drm_open_driver to verify device existence */
igt_fixture {
int fd;
fd = drm_open_driver(DRIVER_INTEL);
devid = intel_get_drm_devid(fd);
sysfs = igt_sysfs_open(fd, NULL);
close(fd);
rc6_mask = get_rc6_enabled_mask();
igt_require(rc6_mask);
measure_residencies(devid, rc6_mask, &res);
}
igt_subtest("rc6-accuracy") {
igt_skip_on(!(rc6_mask & RC6_ENABLED));
residency_accuracy(res.rc6, res.duration, "rc6");
}
igt_subtest("media-rc6-accuracy") {
igt_skip_on(!((rc6_mask & RC6_ENABLED) &&
(IS_VALLEYVIEW(devid) || IS_CHERRYVIEW(devid))));
residency_accuracy(res.media_rc6, res.duration, "media_rc6");
}
igt_subtest("rc6p-accuracy") {
igt_skip_on(!(rc6_mask & RC6P_ENABLED));
residency_accuracy(res.rc6p, res.duration, "rc6p");
}
igt_subtest("rc6pp-accuracy") {
igt_skip_on(!(rc6_mask & RC6PP_ENABLED));
residency_accuracy(res.rc6pp, res.duration, "rc6pp");
}
}
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