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overlay: Read frequency from perf

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2013-08-27 12:24:18 +01:00
parent 1c3fd70357
commit 14614060b8
2 changed files with 87 additions and 18 deletions
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97
overlay/gpu-freq.c
View File

@ -30,6 +30,38 @@
#include "gpu-freq.h"
#include "debugfs.h"
#include "perf.h"
static int perf_i915_open(int config, int group)
{
struct perf_event_attr attr;
memset(&attr, 0, sizeof (attr));
attr.type = i915_type_id();
if (attr.type == 0)
return -ENOENT;
attr.config = config;
attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED;
if (group == -1)
attr.read_format |= PERF_FORMAT_GROUP;
return perf_event_open(&attr, -1, 0, group, 0);
}
static int perf_open(void)
{
int fd;
fd = perf_i915_open(I915_PERF_ACTUAL_FREQUENCY, -1);
if (perf_i915_open(I915_PERF_REQUESTED_FREQUENCY, fd) < 0) {
close(fd);
fd = -1;
}
return fd;
}
int gpu_freq_init(struct gpu_freq *gf)
{
@ -38,6 +70,8 @@ int gpu_freq_init(struct gpu_freq *gf)
memset(gf, 0, sizeof(*gf));
gf->fd = perf_open();
sprintf(buf, "%s/i915_cur_delayinfo", debugfs_dri_path);
fd = open(buf, 0);
if (fd < 0)
@ -79,31 +113,58 @@ err:
int gpu_freq_update(struct gpu_freq *gf)
{
char buf[4096], *s;
int fd, len = -1;
if (gf->error)
return gf->error;
sprintf(buf, "%s/i915_cur_delayinfo", debugfs_dri_path);
fd = open(buf, 0);
if (fd < 0)
return gf->error = errno;
if (gf->fd < 0) {
char buf[4096], *s;
int fd, len = -1;
len = read(fd, buf, sizeof(buf)-1);
close(fd);
if (len < 0)
return gf->error = EIO;
sprintf(buf, "%s/i915_cur_delayinfo", debugfs_dri_path);
fd = open(buf, 0);
if (fd < 0)
return gf->error = errno;
buf[len] = '\0';
len = read(fd, buf, sizeof(buf)-1);
close(fd);
if (len < 0)
return gf->error = EIO;
s = strstr(buf, "RPNSWREQ:");
if (s)
sscanf(s, "RPNSWREQ: %dMHz", &gf->request);
buf[len] = '\0';
s = strstr(buf, "CAGF:");
if (s)
sscanf(s, "CAGF: %dMHz", &gf->current);
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) / d_time;
gf->request = (s->req - d->req) / d_time;
}
return 0;
}

8
overlay/gpu-freq.h
View File

@ -25,7 +25,15 @@
#ifndef GPU_FREQ_H
#define GPU_FREQ_H
#include <stdint.h>
struct gpu_freq {
struct gpu_freq_stat {
uint64_t act, req;
uint64_t timestamp;
} stat[2];
int fd;
int count;
int min, max;
int rpn, rp1, rp0;
int request;