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/*
* 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 <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include "igt_perf.h"
#include "gpu-freq.h"
#include "debugfs.h"
static int perf_open(void)
{
int fd;
fd = perf_igfx_open_group(I915_PMU_ACTUAL_FREQUENCY, -1);
if (perf_igfx_open_group(I915_PMU_REQUESTED_FREQUENCY, fd) < 0) {
close(fd);
fd = -1;
}
return fd;
}
int gpu_freq_init(struct gpu_freq *gf)
{
char buf[4096], *s;
int fd, len = -1;
memset(gf, 0, sizeof(*gf));
gf->fd = perf_open();
sprintf(buf, "%s/i915_frequency_info", debugfs_dri_path);
fd = open(buf, 0);
if (fd < 0) {
sprintf(buf, "%s/i915_cur_delayinfo", debugfs_dri_path);
fd = open(buf, 0);
}
if (fd < 0)
return gf->error = errno;
len = read(fd, buf, sizeof(buf)-1);
close(fd);
if (len < 0)
goto err;
buf[len] = '\0';
if (strstr(buf, "PUNIT_REG_GPU_FREQ_STS")) {
/* Baytrail is special, ofc. */
gf->is_byt = 1;
s = strstr(buf, "max");
if (s != NULL)
sscanf(s, "max GPU freq: %d MHz", &gf->max);
s = strstr(buf, "min");
if (s != NULL)
sscanf(s, "min GPU freq: %d MHz", &gf->min);
gf->rp0 = gf->rp1 = gf->max;
gf->rpn = gf->min;
} else {
s = strstr(buf, "(RPN)");
if (s == NULL)
goto err;
sscanf(s, "(RPN) frequency: %dMHz", &gf->rpn);
s = strstr(s, "(RP1)");
if (s == NULL)
goto err;
sscanf(s, "(RP1) frequency: %dMHz", &gf->rp1);
s = strstr(s, "(RP0)");
if (s == NULL)
goto err;
sscanf(s, "(RP0) frequency: %dMHz", &gf->rp0);
s = strstr(s, "Max");
if (s == NULL)
goto err;
sscanf(s, "Max overclocked frequency: %dMHz", &gf->max);
gf->min = gf->rpn;
}
return 0;
err:
return gf->error = EIO;
}
int gpu_freq_update(struct gpu_freq *gf)
{
if (gf->error)
return gf->error;
if (gf->fd < 0) {
char buf[4096], *s;
int fd, len = -1;
sprintf(buf, "%s/i915_frequency_info", debugfs_dri_path);
fd = open(buf, 0);
if (fd < 0) {
sprintf(buf, "%s/i915_cur_delayinfo", debugfs_dri_path);
fd = open(buf, 0);
}
if (fd < 0)
return gf->error = errno;
len = read(fd, buf, sizeof(buf)-1);
close(fd);
if (len < 0)
return gf->error = EIO;
buf[len] = '\0';
if (gf->is_byt) {
s = strstr(buf, "current");
if (s)
sscanf(s, "current GPU freq: %d MHz", &gf->current);
gf->request = gf->current;
} else {
s = strstr(buf, "RPNSWREQ:");
if (s)
sscanf(s, "RPNSWREQ: %dMHz", &gf->request);
s = strstr(buf, "CAGF:");
if (s)
sscanf(s, "CAGF: %dMHz", &gf->current);
}
} else {
struct gpu_freq_stat *s = &gf->stat[gf->count++&1];
struct gpu_freq_stat *d = &gf->stat[gf->count&1];
uint64_t data[4], d_time;
int len;
len = read(gf->fd, data, sizeof(data));
if (len < 0)
return gf->error = errno;
s->timestamp = data[1];
s->act = data[2];
s->req = data[3];
if (gf->count == 1)
return EAGAIN;
d_time = s->timestamp - d->timestamp;
if (d_time == 0) {
gf->count--;
return EAGAIN;
}
gf->current = (s->act - d->act) * 1e9 / d_time;
gf->request = (s->req - d->req) * 1e9 / d_time;
}
return 0;
}
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