idle/cpuidle: Split cpuidle_idle_call main function into smaller functions
In order to allow better integration between the cpuidle framework and the
scheduler, reducing the distance between these two sub-components will
facilitate this integration by moving part of the cpuidle code in the idle
task file and, because idle.c is in the sched directory, we have access to
the scheduler's private structures.
This patch splits the cpuidle_idle_call main entry function into 3 calls
to a newly added API:
1. select the idle state
2. enter the idle state
3. reflect the idle state
The cpuidle_idle_call calls these three functions to implement the main
idle entry function.
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: rjw@rjwysocki.net
Cc: preeti@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/1393832934-11625-1-git-send-email-daniel.lezcano@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index 50fcbb0..accc2dd 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -119,6 +119,15 @@
#ifdef CONFIG_CPU_IDLE
extern void disable_cpuidle(void);
+
+extern int cpuidle_enabled(struct cpuidle_driver *drv,
+ struct cpuidle_device *dev);
+extern int cpuidle_select(struct cpuidle_driver *drv,
+ struct cpuidle_device *dev);
+extern int cpuidle_enter(struct cpuidle_driver *drv,
+ struct cpuidle_device *dev, int index);
+extern void cpuidle_reflect(struct cpuidle_device *dev, int index);
+
extern int cpuidle_idle_call(void);
extern int cpuidle_register_driver(struct cpuidle_driver *drv);
extern struct cpuidle_driver *cpuidle_get_driver(void);
@@ -141,6 +150,16 @@
extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev);
#else
static inline void disable_cpuidle(void) { }
+static inline int cpuidle_enabled(struct cpuidle_driver *drv,
+ struct cpuidle_device *dev)
+{return -ENODEV; }
+static inline int cpuidle_select(struct cpuidle_driver *drv,
+ struct cpuidle_device *dev)
+{return -ENODEV; }
+static inline int cpuidle_enter(struct cpuidle_driver *drv,
+ struct cpuidle_device *dev, int index)
+{return -ENODEV; }
+static inline void cpuidle_reflect(struct cpuidle_device *dev, int index) { }
static inline int cpuidle_idle_call(void) { return -ENODEV; }
static inline int cpuidle_register_driver(struct cpuidle_driver *drv)
{return -ENODEV; }