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powercap/dtpm_devfreq: Use new Energy Model interface to get table

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Energy Model framework support modifications at runtime of the power
values. Use the new EM table API which is protected with RCU. Align the
code so that this RCU read section is short.

This change is not expected to alter the general functionality.

Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lukasz Luba 2024-02-08 11:55:51 +00:00 committed by Rafael J. Wysocki
parent e20b7a8172
commit 27d2c37e7d
1 changed files with 23 additions and 11 deletions
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34
drivers/powercap/dtpm_devfreq.c
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@ -37,11 +37,16 @@ static int update_pd_power_uw(struct dtpm *dtpm)
struct devfreq *devfreq = dtpm_devfreq->devfreq;
struct device *dev = devfreq->dev.parent;
struct em_perf_domain *pd = em_pd_get(dev);
struct em_perf_state *table;
dtpm->power_min = pd->table[0].power;
rcu_read_lock();
table = em_perf_state_from_pd(pd);
dtpm->power_max = pd->table[pd->nr_perf_states - 1].power;
dtpm->power_min = table[0].power;
dtpm->power_max = table[pd->nr_perf_states - 1].power;
rcu_read_unlock();
return 0;
}
@ -51,20 +56,23 @@ static u64 set_pd_power_limit(struct dtpm *dtpm, u64 power_limit)
struct devfreq *devfreq = dtpm_devfreq->devfreq;
struct device *dev = devfreq->dev.parent;
struct em_perf_domain *pd = em_pd_get(dev);
struct em_perf_state *table;
unsigned long freq;
int i;
rcu_read_lock();
table = em_perf_state_from_pd(pd);
for (i = 0; i < pd->nr_perf_states; i++) {
if (pd->table[i].power > power_limit)
if (table[i].power > power_limit)
break;
}
freq = pd->table[i - 1].frequency;
freq = table[i - 1].frequency;
power_limit = table[i - 1].power;
rcu_read_unlock();
dev_pm_qos_update_request(&dtpm_devfreq->qos_req, freq);
power_limit = pd->table[i - 1].power;
return power_limit;
}
@ -89,8 +97,9 @@ static u64 get_pd_power_uw(struct dtpm *dtpm)
struct device *dev = devfreq->dev.parent;
struct em_perf_domain *pd = em_pd_get(dev);
struct devfreq_dev_status status;
struct em_perf_state *table;
unsigned long freq;
u64 power;
u64 power = 0;
int i;
mutex_lock(&devfreq->lock);
@ -100,19 +109,22 @@ static u64 get_pd_power_uw(struct dtpm *dtpm)
freq = DIV_ROUND_UP(status.current_frequency, HZ_PER_KHZ);
_normalize_load(&status);
rcu_read_lock();
table = em_perf_state_from_pd(pd);
for (i = 0; i < pd->nr_perf_states; i++) {
if (pd->table[i].frequency < freq)
if (table[i].frequency < freq)
continue;
power = pd->table[i].power;
power = table[i].power;
power *= status.busy_time;
power >>= 10;
return power;
break;
}
rcu_read_unlock();
return 0;
return power;
}
static void pd_release(struct dtpm *dtpm)