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Subject[PATCH 1/2] PM / Domains: Introduce function to power off all unused PM domains
Date
From: Rafael J. Wysocki <rjw@sisk.pl>

Add a new function pm_genpd_poweroff_unused() queuing up the
execution of pm_genpd_poweroff() for every initialized generic PM
domain. Calling it will cause every generic PM domain without
devices in use to be powered off.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
drivers/base/power/domain.c | 21 +++++++++++++++++++++
include/linux/pm_domain.h | 3 +++
2 files changed, 24 insertions(+)
Index: linux-2.6/include/linux/pm_domain.h
===================================================================
--- linux-2.6.orig/include/linux/pm_domain.h
+++ linux-2.6/include/linux/pm_domain.h
@@ -24,6 +24,7 @@ struct dev_power_governor {

struct generic_pm_domain {
struct dev_pm_domain domain; /* PM domain operations */
+ struct list_head gpd_list_node; /* Node in the global PM domains list */
struct list_head sd_node; /* Node in the parent's subdomain list */
struct generic_pm_domain *parent; /* Parent PM domain */
struct list_head sd_list; /* List of dubdomains */
@@ -71,6 +72,7 @@ extern int pm_genpd_remove_subdomain(str
extern void pm_genpd_init(struct generic_pm_domain *genpd,
struct dev_power_governor *gov, bool is_off);
extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
+extern void pm_genpd_poweroff_unused(void);
#else
static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
struct device *dev)
@@ -98,6 +100,7 @@ static inline int pm_genpd_poweron(struc
{
return -ENOSYS;
}
+static inline void pm_genpd_poweroff_unused(void) {}
#endif

#endif /* _LINUX_PM_DOMAIN_H */
Index: linux-2.6/drivers/base/power/domain.c
===================================================================
--- linux-2.6.orig/drivers/base/power/domain.c
+++ linux-2.6/drivers/base/power/domain.c
@@ -16,6 +16,9 @@
#include <linux/sched.h>
#include <linux/suspend.h>

+static LIST_HEAD(gpd_list);
+static DEFINE_MUTEX(gpd_list_lock);
+
#ifdef CONFIG_PM

static struct generic_pm_domain *dev_to_genpd(struct device *dev)
@@ -1241,4 +1244,22 @@ void pm_genpd_init(struct generic_pm_dom
genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq;
genpd->domain.ops.restore = pm_genpd_restore;
genpd->domain.ops.complete = pm_genpd_complete;
+ mutex_lock(&gpd_list_lock);
+ list_add(&genpd->gpd_list_node, &gpd_list);
+ mutex_unlock(&gpd_list_lock);
+}
+
+/**
+ * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use.
+ */
+void pm_genpd_poweroff_unused(void)
+{
+ struct generic_pm_domain *genpd;
+
+ mutex_lock(&gpd_list_lock);
+
+ list_for_each_entry(genpd, &gpd_list, gpd_list_node)
+ genpd_queue_power_off_work(genpd);
+
+ mutex_unlock(&gpd_list_lock);
}


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