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#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include "gpu-freq.h"
int gpu_freq_init(struct gpu_freq *gf)
{
char buf[4096], *s;
int fd, len = -1;
memset(gf, 0, sizeof(*gf));
fd = open("/sys/kernel/debug/dri/0/i915_cur_delayinfo", 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';
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)
{
char buf[4096], *s;
int fd, len = -1;
if (gf->error)
return gf->error;
fd = open("/sys/kernel/debug/dri/0/i915_cur_delayinfo", 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';
s = strstr(buf, "RPNSWREQ:");
if (s)
sscanf(s, "RPNSWREQ: %dMHz", &gf->request);
s = strstr(buf, "CAGF:");
if (s)
sscanf(s, "CAGF: %dMHz", &gf->current);
return 0;
}
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