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PM / OPP: Add dev_pm_opp_get_sharing_cpus()

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OPP core allows a platform to mark OPP table as shared, when the
platform isn't using operating-points-v2 bindings.

And, so there should be a non DT way of finding out if the OPP table is
shared or not.

This patch adds dev_pm_opp_get_sharing_cpus(), which first tries to get
OPP sharing information from the opp-table (in case it is already marked
as shared), otherwise it uses the existing DT way of finding sharing
information.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2016-04-27 08:52:23 +05:30 committed by Rafael J. Wysocki
parent dde370b23c
commit 6f707daa38
2 changed files with 51 additions and 0 deletions
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45
drivers/base/power/opp/cpu.c
View File

@ -330,3 +330,48 @@ unlock:
return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus);
/**
* dev_pm_opp_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with @cpu_dev
* @cpu_dev: CPU device for which we do this operation
* @cpumask: cpumask to update with information of sharing CPUs
*
* This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
*
* Returns -ENODEV if OPP table isn't already present.
*
* Locking: The internal opp_table and opp structures are RCU protected.
* Hence this function internally uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
*/
int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
{
struct opp_device *opp_dev;
struct opp_table *opp_table;
int ret = 0;
mutex_lock(&opp_table_lock);
opp_table = _find_opp_table(cpu_dev);
if (IS_ERR(opp_table)) {
ret = PTR_ERR(opp_table);
goto unlock;
}
cpumask_clear(cpumask);
if (opp_table->shared_opp) {
list_for_each_entry(opp_dev, &opp_table->dev_list, node)
cpumask_set_cpu(opp_dev->dev->id, cpumask);
} else {
cpumask_set_cpu(cpu_dev->id, cpumask);
}
unlock:
mutex_unlock(&opp_table_lock);
return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_sharing_cpus);

6
include/linux/pm_opp.h
View File

@ -66,6 +66,7 @@ int dev_pm_opp_set_regulator(struct device *dev, const char *name);
void dev_pm_opp_put_regulator(struct device *dev);
int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq);
int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const cpumask_var_t cpumask);
int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask);
#else
static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
{
@ -184,6 +185,11 @@ static inline int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const cpum
return -ENOTSUPP;
}
static inline int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
{
return -EINVAL;
}
#endif /* CONFIG_PM_OPP */
#if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)