PM / OPP: Add dev_pm_opp_get_sharing_cpus()

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>

2 files changed, 51 insertions, 0 deletions

diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c
index 5469e7730ff2..3428380dfca7 100644
--- a/drivers/base/power/opp/cpu.c
+++ b/drivers/base/power/opp/cpu.c
@@ -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);
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 0c08ed3836b1..15f554443b59 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, 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)