Some drivers need to obtain the cpuidle_driver via CPU ID before the
cpuidle_device is registered. Therefore, this interface is added.
Tested-by: Shaobo Huang <huangshaobo2075@xxxxxxxxxxxxxx>
Signed-off-by: Yaxiong Tian <tianyaxiong@xxxxxxxxxx>
Signed-off-by: Shaobo Huang <huangshaobo2075@xxxxxxxxxxxxxx>
Signed-off-by: Yinfeng Wang <wangyinfeng@xxxxxxxxxxxxxx>
Signed-off-by: Xu Wang<wangxu@xxxxxxxxxxxxxx>
---
drivers/cpuidle/driver.c | 16 ++++++++++++++++
include/linux/cpuidle.h | 4 ++++
2 files changed, 20 insertions(+)
diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c
index 9bbfa594c442..8647f8165863 100644
--- a/drivers/cpuidle/driver.c
+++ b/drivers/cpuidle/driver.c
@@ -353,6 +353,22 @@ struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev)
}
EXPORT_SYMBOL_GPL(cpuidle_get_cpu_driver);
+/**
+ * cpuidle_get_cpu_driver_by_cpu - return the driver registered for a CPU.
+ * @cpu_num: a valid cpu num
+ *
+ * Returns a struct cpuidle_driver pointer, or NULL if no driver is registered
+ * for the CPU associated with @cpu.
+ */
+struct cpuidle_driver *cpuidle_get_cpu_driver_by_cpu(int cpu_num)
+{
+ if (cpu_num < 0 || cpu_num >= nr_cpu_ids)
+ return NULL;
+
+ return __cpuidle_get_cpu_driver(cpu_num);
+}
+EXPORT_SYMBOL_GPL(cpuidle_get_cpu_driver_by_cpu);
+
/**
* cpuidle_driver_state_disabled - Disable or enable an idle state
* @drv: cpuidle driver owning the state
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index a9ee4fe55dcf..aebbaae6a501 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -200,6 +200,7 @@ extern void cpuidle_disable_device(struct cpuidle_device *dev);
extern int cpuidle_play_dead(void);
extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev);
+extern struct cpuidle_driver *cpuidle_get_cpu_driver_by_cpu(int cpu_num);
static inline struct cpuidle_device *cpuidle_get_device(void)
{return __this_cpu_read(cpuidle_devices); }
#else
@@ -240,6 +241,9 @@ static inline void cpuidle_disable_device(struct cpuidle_device *dev) { }
static inline int cpuidle_play_dead(void) {return -ENODEV; }
static inline struct cpuidle_driver *cpuidle_get_cpu_driver(
struct cpuidle_device *dev) {return NULL; }
+
+static inline struct cpuidle_driver *cpuidle_get_cpu_driver_by_cpu(
+ int cpu_num) {return NULL; };
static inline struct cpuidle_device *cpuidle_get_device(void) {return NULL; }
#endif
--
2.25.1
