static int nvhost_pod_estimate_freq(struct devfreq *df,
unsigned long *freq)
{
struct podgov_info_rec *podgov = df->data;
struct devfreq_dev_status dev_stat;
struct nvhost_devfreq_ext_stat *ext_stat;
long delay;
int current_event;
int stat;
ktime_t now;
stat = df->profile->get_dev_status(df->dev.parent, &dev_stat);
if (stat < 0)
return stat;
/* Ensure maximal clock when scaling is disabled */
if (!podgov->enable) {
*freq = df->max_freq;
return 0;
}
if (podgov->p_user) {
*freq = podgov->p_freq_request;
return 0;
}
current_event = DEVICE_IDLE;
stat = 0;
now = ktime_get();
/* Local adjustments (i.e. requests from kernel threads) are
* handled here */
if (podgov->adjustment_type == ADJUSTMENT_LOCAL) {
podgov->adjustment_type = ADJUSTMENT_DEVICE_REQ;
/* Do not do unnecessary scaling */
scaling_limit(df, &podgov->adjustment_frequency);
if (df->previous_freq == podgov->adjustment_frequency)
return GET_TARGET_FREQ_DONTSCALE;
trace_podgov_estimate_freq(df->previous_freq,
podgov->adjustment_frequency);
*freq = podgov->adjustment_frequency;
return 0;
}
/* Retrieve extended data */
ext_stat = dev_stat.private_data;
if (!ext_stat)
return -EINVAL;
current_event = ext_stat->busy;
*freq = dev_stat.current_frequency;
df->min_freq = ext_stat->min_freq;
df->max_freq = ext_stat->max_freq;
/* Sustain local variables */
podgov->last_event_type = current_event;
podgov->total_idle += (dev_stat.total_time - dev_stat.busy_time);
podgov->last_total_idle += (dev_stat.total_time - dev_stat.busy_time);
/* update the load estimate based on idle time */
update_load_estimate(df);
/* if throughput hint enabled, and last hint is recent enough, return */
if (podgov->p_use_throughput_hint &&
ktime_us_delta(now, podgov->last_throughput_hint) < 1000000)
return GET_TARGET_FREQ_DONTSCALE;
switch (current_event) {
case DEVICE_IDLE:
/* delay idle_max % of 2 * fast_response time (given in
* microseconds) */
*freq = scaling_state_check(df, now);
delay = (podgov->idle_max * podgov->p_estimation_window)
/ 500000;
schedule_delayed_work(&podgov->idle_timer,
msecs_to_jiffies(delay));
break;
case DEVICE_BUSY:
cancel_delayed_work(&podgov->idle_timer);
*freq = scaling_state_check(df, now);
break;
case DEVICE_UNKNOWN:
*freq = scaling_state_check(df, now);
break;
}
if (!(*freq) || (*freq == df->previous_freq))
return GET_TARGET_FREQ_DONTSCALE;
trace_podgov_estimate_freq(df->previous_freq, *freq);
return 0;
}
static int nvhost_pod_estimate_freq(struct devfreq *df,
unsigned long *freq)
{
struct podgov_info_rec *podgov = df->data;
struct devfreq_dev_status dev_stat;
struct nvhost_devfreq_ext_stat *ext_stat;
int current_event;
int stat;
ktime_t now;
stat = df->profile->get_dev_status(df->dev.parent, &dev_stat);
if (stat < 0)
return stat;
/* Ensure maximal clock when scaling is disabled */
if (!podgov->enable) {
*freq = df->max_freq;
return 0;
}
if (podgov->p_user) {
*freq = podgov->p_freq_request;
return 0;
}
current_event = DEVICE_IDLE;
stat = 0;
now = ktime_get();
/* Local adjustments (i.e. requests from kernel threads) are
* handled here */
if (podgov->adjustment_type == ADJUSTMENT_LOCAL) {
podgov->adjustment_type = ADJUSTMENT_DEVICE_REQ;
/* Do not do unnecessary scaling */
scaling_limit(df, &podgov->adjustment_frequency);
/* Round the frequency and check if we're already there */
if (freqlist_up(podgov, podgov->adjustment_frequency, 0) ==
dev_stat.current_frequency)
return GET_TARGET_FREQ_DONTSCALE;
trace_podgov_estimate_freq(df->previous_freq,
podgov->adjustment_frequency);
*freq = podgov->adjustment_frequency;
return 0;
}
/* Retrieve extended data */
ext_stat = dev_stat.private_data;
if (!ext_stat)
return -EINVAL;
current_event = ext_stat->busy;
*freq = dev_stat.current_frequency;
df->min_freq = ext_stat->min_freq;
df->max_freq = ext_stat->max_freq;
/* Sustain local variables */
podgov->last_event_type = current_event;
podgov->idle = 1000 * (dev_stat.total_time - dev_stat.busy_time);
podgov->idle = podgov->idle / dev_stat.total_time;
podgov->idle_avg = (podgov->p_smooth * podgov->idle_avg) +
podgov->idle;
podgov->idle_avg = podgov->idle_avg / (podgov->p_smooth + 1);
/* if throughput hint enabled, and last hint is recent enough, return */
if (podgov->p_use_throughput_hint &&
ktime_us_delta(now, podgov->last_throughput_hint) < 1000000)
return GET_TARGET_FREQ_DONTSCALE;
switch (current_event) {
case DEVICE_IDLE:
/* Launch a work to slowdown the gpu */
*freq = scaling_state_check(df, now);
schedule_delayed_work(&podgov->idle_timer,
msecs_to_jiffies(podgov->p_slowdown_delay));
break;
case DEVICE_BUSY:
cancel_delayed_work(&podgov->idle_timer);
*freq = scaling_state_check(df, now);
break;
}
if (!(*freq) ||
(freqlist_up(podgov, *freq, 0) == dev_stat.current_frequency))
return GET_TARGET_FREQ_DONTSCALE;
podgov->last_scale = now;
trace_podgov_estimate_freq(df->previous_freq, *freq);
return 0;
}
