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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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