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 --- drivers/base/power/opp/cpu.c | 45 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/pm_opp.h | 6 ++++++ 2 files changed, 51 insertions(+)
diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c index 55cbf9bd8707..9c4eb90759fb 100644 --- a/drivers/base/power/opp/cpu.c +++ b/drivers/base/power/opp/cpu.c @@ -329,3 +329,48 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) 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); diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index 5b6ad31403a5..d6effc931013 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -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, 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, cpumask_va return -ENOSYS; }
+static inline int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) +{ + return -ENOSYS; +} + #endif /* CONFIG_PM_OPP */
#if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)