static unsigned long meas_bw_and_set_irq(struct bw_hwmon *hw,
unsigned int tol, unsigned int us)
{
unsigned long mbps;
u32 limit;
unsigned int sample_ms = hw->df->profile->polling_ms;
struct bwmon *m = to_bwmon(hw);
mon_disable(m);
mbps = mon_get_count(m);
mbps = bytes_to_mbps(mbps, us);
/*
* If the counter wraps on thres, don't set the thres too low.
* Setting it too low runs the risk of the counter wrapping around
* multiple times before the IRQ is processed.
*/
if (likely(!m->spec->wrap_on_thres))
limit = mbps_to_bytes(mbps, sample_ms, tol);
else
limit = mbps_to_bytes(max(mbps, 400UL), sample_ms, tol);
mon_set_limit(m, limit);
mon_clear(m);
mon_irq_clear(m);
mon_enable(m);
dev_dbg(m->dev, "MBps = %lu\n", mbps);
return mbps;
}
static int __bw_hwmon_sample_end(struct bw_hwmon *hwmon)
{
struct devfreq *df;
struct hwmon_node *node;
ktime_t ts;
unsigned long bytes, mbps;
unsigned int us;
int wake = 0;
df = hwmon->df;
node = df->data;
ts = ktime_get();
us = ktime_to_us(ktime_sub(ts, node->prev_ts));
bytes = hwmon->get_bytes_and_clear(hwmon);
bytes += node->bytes;
node->bytes = 0;
mbps = bytes_to_mbps(bytes, us);
node->max_mbps = max(node->max_mbps, mbps);
/*
* If the measured bandwidth in a micro sample is greater than the
* wake up threshold, it indicates an increase in load that's non
* trivial. So, have the governor ignore historical idle time or low
* bandwidth usage and do the bandwidth calculation based on just
* this micro sample.
*/
if (mbps > node->up_wake_mbps) {
wake = UP_WAKE;
} else if (mbps < node->down_wake_mbps) {
if (node->down_cnt)
node->down_cnt--;
if (node->down_cnt <= 0)
wake = DOWN_WAKE;
}
node->prev_ts = ts;
node->wake = wake;
node->sampled = true;
return wake;
}
static unsigned long meas_bw_and_set_irq(struct bw_hwmon *hw,
unsigned int tol, unsigned int us)
{
unsigned long mbps;
u32 limit;
unsigned int sample_ms = hw->df->profile->polling_ms;
struct bwmon *m = to_bwmon(hw);
mon_disable(m);
mbps = mon_get_count(m);
mbps = bytes_to_mbps(mbps, us);
/* + 1024 is to workaround HW design issue. Needs further tuning. */
limit = mbps_to_bytes(mbps + 1024, sample_ms, tol);
mon_set_limit(m, limit);
mon_clear(m);
mon_irq_clear(m);
mon_enable(m);
dev_dbg(m->dev, "MBps = %lu\n", mbps);
return mbps;
}
