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Subject[v4 PATCH 2/5]: cpuidle: Implement routines to register and unregister idle function.
* Arun R Bharadwaj <arun@linux.vnet.ibm.com> [2009-09-01 17:07:04]:

Implement a LIFO based approach for registering arch dependent
idle routines.

This is a prototype for pseries, needs to be extended
for other platforms.

Signed-off-by: Arun R Bharadwaj <arun@linux.vnet.ibm.com>
---
arch/powerpc/kernel/idle.c | 5 +++++
drivers/cpuidle/cpuidle.c | 37 +++++++++++++++++++++++++++++++++++++
include/linux/pm.h | 10 ++++++++++
3 files changed, 52 insertions(+)

Index: linux.trees.git/arch/powerpc/kernel/idle.c
===================================================================
--- linux.trees.git.orig/arch/powerpc/kernel/idle.c
+++ linux.trees.git/arch/powerpc/kernel/idle.c
@@ -46,6 +46,11 @@ static int __init powersave_off(char *ar
}
__setup("powersave=off", powersave_off);

+void set_arch_idle(void (*idle)(void))
+{
+ ppc_md.power_save = idle;
+}
+
/*
* The body of the idle task.
*/
Index: linux.trees.git/include/linux/pm.h
===================================================================
--- linux.trees.git.orig/include/linux/pm.h
+++ linux.trees.git/include/linux/pm.h
@@ -30,6 +30,16 @@ extern void (*pm_idle)(void);
extern void (*pm_power_off)(void);
extern void (*pm_power_off_prepare)(void);

+struct idle_function_desc {
+ char *name;
+ void (*idle_func)(void);
+ struct list_head idle_list;
+};
+
+extern void set_arch_idle(void (*idle)(void));
+extern void register_idle_function(struct idle_function_desc *desc);
+extern void unregister_idle_function(struct idle_function_desc *desc);
+
/*
* Device power management
*/
Index: linux.trees.git/drivers/cpuidle/cpuidle.c
===================================================================
--- linux.trees.git.orig/drivers/cpuidle/cpuidle.c
+++ linux.trees.git/drivers/cpuidle/cpuidle.c
@@ -44,6 +44,43 @@ static void cpuidle_kick_cpus(void)
static void cpuidle_kick_cpus(void) {}
#endif

+LIST_HEAD(idle_function_list);
+static DEFINE_MUTEX(idle_list_mutex);
+
+void register_idle_function(struct idle_function_desc *desc)
+{
+ mutex_lock(&idle_list_mutex);
+
+ list_add(&desc->idle_list, &idle_function_list);
+ set_arch_idle(desc->idle_func);
+ cpuidle_kick_cpus();
+
+ mutex_unlock(&idle_list_mutex);
+}
+
+void unregister_idle_function(struct idle_function_desc *desc)
+{
+ struct list_head *pos;
+ struct idle_function_desc *temp_desc;
+
+ mutex_lock(&idle_list_mutex);
+ WARN_ON_ONCE(list_empty(&desc->idle_list) || desc != NULL);
+
+ list_for_each(pos, &idle_function_list) {
+ temp_desc = container_of(pos, struct idle_function_desc,
+ idle_list);
+ if (temp_desc == desc) {
+ list_del(&temp_desc->idle_list);
+ /* Re-using temp_desc here */
+ temp_desc = list_first_entry(&idle_function_list,
+ struct idle_function_desc, idle_list);
+ set_arch_idle(temp_desc->idle_func);
+ cpuidle_kick_cpus();
+ }
+ }
+ mutex_unlock(&idle_list_mutex);
+}
+
static int __cpuidle_register_device(struct cpuidle_device *dev);

/**

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