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PM / devfreq: cache_hwmon: Use array for reporting monitor stats

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Using an array to report monitor stats instead of hard coded variable
names would allow for cleaner implementations of some cache hwmon
device drivers.

Change-Id: I787bdc12f10a0c8ff3c4195ce229a2987acdfce7
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>
[avajid@codeaurora.org: made minor styling changes]
Signed-off-by: Amir Vajid <avajid@codeaurora.org>
This commit is contained in:
Junjie Wu 2019-01-16 18:31:11 -08:00 • committed by Amir Vajid
commit 7123adfcc0
3 changed files with 62 additions and 14 deletions
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22
drivers/devfreq/governor_cache_hwmon.c
View file

@ -20,6 +20,7 @@
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/devfreq.h>
#include <trace/events/power.h>
#include "governor.h"
#include "governor_cache_hwmon.h"
@ -119,11 +120,9 @@ static unsigned long measure_mrps_and_set_irq(struct cache_hwmon_node *node,
preempt_enable();
dev_dbg(hw->df->dev.parent,
"stat H=%3lu, M=%3lu, T=%3lu, b=%3u, f=%4lu, us=%d\n",
stat->high, stat->med, stat->high + stat->med,
stat->busy_percent, hw->df->previous_freq / 1000, us);
trace_cache_hwmon_meas(dev_name(hw->df->dev.parent), stat->mrps[HIGH],
stat->mrps[MED], stat->mrps[LOW],
stat->busy_percent, us);
return 0;
}
@ -133,9 +132,9 @@ static void compute_cache_freq(struct cache_hwmon_node *node,
unsigned long new_mhz;
unsigned int busy;
new_mhz = mrps->high * node->cycles_per_high_req
+ mrps->med * node->cycles_per_med_req
+ mrps->low * node->cycles_per_low_req;
new_mhz = mrps->mrps[HIGH] * node->cycles_per_high_req
+ mrps->mrps[MED] * node->cycles_per_med_req
+ mrps->mrps[LOW] * node->cycles_per_low_req;
busy = max(node->min_busy, mrps->busy_percent);
busy = min(node->max_busy, busy);
@ -152,6 +151,7 @@ static void compute_cache_freq(struct cache_hwmon_node *node,
new_mhz += node->guard_band_mhz;
*freq = new_mhz * 1000;
trace_cache_hwmon_update(dev_name(node->hw->df->dev.parent), *freq);
}
#define TOO_SOON_US (1 * USEC_PER_MSEC)
@ -280,9 +280,9 @@ static int start_monitoring(struct devfreq *df)
node->prev_ts = ktime_get();
node->prev_mhz = 0;
mrps.high = (df->previous_freq / 1000) - node->guard_band_mhz;
mrps.high /= node->cycles_per_high_req;
mrps.med = mrps.low = 0;
mrps.mrps[HIGH] = (df->previous_freq / 1000) - node->guard_band_mhz;
mrps.mrps[HIGH] /= node->cycles_per_high_req;
mrps.mrps[MED] = mrps.mrps[LOW] = 0;
ret = hw->start_hwmon(hw, &mrps);
if (ret < 0) {

11
drivers/devfreq/governor_cache_hwmon.h
View file

@ -9,10 +9,15 @@
#include <linux/kernel.h>
#include <linux/devfreq.h>
enum request_group {
HIGH,
MED,
LOW,
MAX_NUM_GROUPS,
};
struct mrps_stats {
unsigned long high;
unsigned long med;
unsigned long low;
unsigned long mrps[MAX_NUM_GROUPS];
unsigned int busy_percent;
};

43
include/trace/events/power.h
View file

@ -585,6 +585,49 @@ TRACE_EVENT(bw_hwmon_update,
__entry->down_thres)
);
TRACE_EVENT(cache_hwmon_meas,
TP_PROTO(const char *name, unsigned long high_mrps,
unsigned long med_mrps, unsigned long low_mrps,
unsigned int busy_percent, unsigned int us),
TP_ARGS(name, high_mrps, med_mrps, low_mrps, busy_percent, us),
TP_STRUCT__entry(
__string(name, name)
__field(unsigned long, high_mrps)
__field(unsigned long, med_mrps)
__field(unsigned long, low_mrps)
__field(unsigned long, total_mrps)
__field(unsigned int, busy_percent)
__field(unsigned int, us)
),
TP_fast_assign(
__assign_str(name, name);
__entry->high_mrps = high_mrps;
__entry->med_mrps = med_mrps;
__entry->low_mrps = low_mrps;
__entry->total_mrps = high_mrps + med_mrps + low_mrps;
__entry->busy_percent = busy_percent;
__entry->us = us;
),
TP_printk("dev=%s H=%lu M=%lu L=%lu T=%lu busy_pct=%u period=%u",
__get_str(name), __entry->high_mrps, __entry->med_mrps,
__entry->low_mrps, __entry->total_mrps,
__entry->busy_percent, __entry->us)
);
TRACE_EVENT(cache_hwmon_update,
TP_PROTO(const char *name, unsigned long freq_mhz),
TP_ARGS(name, freq_mhz),
TP_STRUCT__entry(
__string(name, name)
__field(unsigned long, freq)
),
TP_fast_assign(
__assign_str(name, name);
__entry->freq = freq_mhz;
),
TP_printk("dev=%s freq=%lu", __get_str(name), __entry->freq)
);
#endif /* _TRACE_POWER_H */
/* This part must be outside protection */