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PM / Domains: Automatically update overoptimistic latency information

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Measure the time of execution of the .stop(), .start(), .save_state()
and .restore_state() PM domain device callbacks and if the result
is greater than the corresponding latency value stored in the
device's struct generic_pm_domain_data object, replace the inaccurate
value with the measured time.

Do analogously for the PM domains' .power_off() and .power_off()
callbacks.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Rafael J. Wysocki 2011-12-01 00:02:17 +01:00
parent 221e9b5838
commit 0140d8bd47
1 changed files with 39 additions and 4 deletions
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43
drivers/base/power/domain.c
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@ -33,6 +33,20 @@
__ret; \
})
#define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \
({ \
ktime_t __start = ktime_get(); \
type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \
s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \
struct generic_pm_domain_data *__gpd_data = dev_gpd_data(dev); \
if (__elapsed > __gpd_data->td.field) { \
__gpd_data->td.field = __elapsed; \
dev_warn(dev, name " latency exceeded, new value %lld ns\n", \
__elapsed); \
} \
__retval; \
})
static LIST_HEAD(gpd_list);
static DEFINE_MUTEX(gpd_list_lock);
@ -48,22 +62,27 @@ struct generic_pm_domain *dev_to_genpd(struct device *dev)
static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev)
{
return GENPD_DEV_CALLBACK(genpd, int, stop, dev);
return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev,
stop_latency_ns, "stop");
}
static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev)
{
return GENPD_DEV_CALLBACK(genpd, int, start, dev);
return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev,
start_latency_ns, "start");
}
static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev)
{
return GENPD_DEV_CALLBACK(genpd, int, save_state, dev);
return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev,
save_state_latency_ns, "state save");
}
static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev)
{
return GENPD_DEV_CALLBACK(genpd, int, restore_state, dev);
return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev,
restore_state_latency_ns,
"state restore");
}
static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
@ -182,9 +201,16 @@ int __pm_genpd_poweron(struct generic_pm_domain *genpd)
}
if (genpd->power_on) {
ktime_t time_start = ktime_get();
s64 elapsed_ns;
ret = genpd->power_on(genpd);
if (ret)
goto err;
elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
if (elapsed_ns > genpd->power_on_latency_ns)
genpd->power_on_latency_ns = elapsed_ns;
}
genpd_set_active(genpd);
@ -377,11 +403,16 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
}
if (genpd->power_off) {
ktime_t time_start;
s64 elapsed_ns;
if (atomic_read(&genpd->sd_count) > 0) {
ret = -EBUSY;
goto out;
}
time_start = ktime_get();
/*
* If sd_count > 0 at this point, one of the subdomains hasn't
* managed to call pm_genpd_poweron() for the master yet after
@ -395,6 +426,10 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
genpd_set_active(genpd);
goto out;
}
elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
if (elapsed_ns > genpd->power_off_latency_ns)
genpd->power_off_latency_ns = elapsed_ns;
}
genpd->status = GPD_STATE_POWER_OFF;