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Subject[PATCH 1/3] PM / Domains: Split device PM domain data into base and need_restore
Date
From: Rafael J. Wysocki <rjw@sisk.pl>

The struct pm_domain_data data type is defined in such a way that
adding new fields specific to the generic PM domains code will
require include/linux/pm.h to be modified. As a result, data types
used only by the generic PM domains code will be defined in two
headers, although they all should be defined in pm_domain.h and
pm.h will need to include more headers, which won't be very nice.

For this reason change the definition of struct pm_subsys_data
so that its domain_data member is a pointer, which will allow
struct pm_domain_data to be subclassed by various PM domains
implementations. Remove the need_restore member from
struct pm_domain_data and make the generic PM domains code
subclass it by adding the need_restore member to the new data type.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
drivers/base/power/domain.c | 28 +++++++++++++++++++---------
include/linux/pm.h | 3 +--
include/linux/pm_domain.h | 10 ++++++++++
3 files changed, 30 insertions(+), 11 deletions(-)

Index: linux/include/linux/pm.h
===================================================================
--- linux.orig/include/linux/pm.h
+++ linux/include/linux/pm.h
@@ -433,7 +433,6 @@ struct wakeup_source;
struct pm_domain_data {
struct list_head list_node;
struct device *dev;
- bool need_restore;
};

struct pm_subsys_data {
@@ -443,7 +442,7 @@ struct pm_subsys_data {
struct list_head clock_list;
#endif
#ifdef CONFIG_PM_GENERIC_DOMAINS
- struct pm_domain_data domain_data;
+ struct pm_domain_data *domain_data;
#endif
};

Index: linux/include/linux/pm_domain.h
===================================================================
--- linux.orig/include/linux/pm_domain.h
+++ linux/include/linux/pm_domain.h
@@ -62,6 +62,16 @@ struct gpd_link {
struct list_head slave_node;
};

+struct generic_pm_domain_data {
+ struct pm_domain_data base;
+ bool need_restore;
+};
+
+static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
+{
+ return container_of(pdd, struct generic_pm_domain_data, base);
+}
+
#ifdef CONFIG_PM_GENERIC_DOMAINS
extern int pm_genpd_add_device(struct generic_pm_domain *genpd,
struct device *dev);
Index: linux/drivers/base/power/domain.c
===================================================================
--- linux.orig/drivers/base/power/domain.c
+++ linux/drivers/base/power/domain.c
@@ -188,11 +188,12 @@ static int __pm_genpd_save_device(struct
struct generic_pm_domain *genpd)
__releases(&genpd->lock) __acquires(&genpd->lock)
{
+ struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
struct device *dev = pdd->dev;
struct device_driver *drv = dev->driver;
int ret = 0;

- if (pdd->need_restore)
+ if (gpd_data->need_restore)
return 0;

mutex_unlock(&genpd->lock);
@@ -210,7 +211,7 @@ static int __pm_genpd_save_device(struct
mutex_lock(&genpd->lock);

if (!ret)
- pdd->need_restore = true;
+ gpd_data->need_restore = true;

return ret;
}
@@ -224,10 +225,11 @@ static void __pm_genpd_restore_device(st
struct generic_pm_domain *genpd)
__releases(&genpd->lock) __acquires(&genpd->lock)
{
+ struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
struct device *dev = pdd->dev;
struct device_driver *drv = dev->driver;

- if (!pdd->need_restore)
+ if (!gpd_data->need_restore)
return;

mutex_unlock(&genpd->lock);
@@ -244,7 +246,7 @@ static void __pm_genpd_restore_device(st

mutex_lock(&genpd->lock);

- pdd->need_restore = false;
+ gpd_data->need_restore = false;
}

/**
@@ -493,7 +495,7 @@ static int pm_genpd_runtime_resume(struc
mutex_lock(&genpd->lock);
}
finish_wait(&genpd->status_wait_queue, &wait);
- __pm_genpd_restore_device(&dev->power.subsys_data->domain_data, genpd);
+ __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd);
genpd->resume_count--;
genpd_set_active(genpd);
wake_up_all(&genpd->status_wait_queue);
@@ -1080,6 +1082,7 @@ static void pm_genpd_complete(struct dev
*/
int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
{
+ struct generic_pm_domain_data *gpd_data;
struct pm_domain_data *pdd;
int ret = 0;

@@ -1106,14 +1109,20 @@ int pm_genpd_add_device(struct generic_p
goto out;
}

+ gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
+ if (!gpd_data) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
genpd->device_count++;

dev->pm_domain = &genpd->domain;
dev_pm_get_subsys_data(dev);
- pdd = &dev->power.subsys_data->domain_data;
- pdd->dev = dev;
- pdd->need_restore = false;
- list_add_tail(&pdd->list_node, &genpd->dev_list);
+ dev->power.subsys_data->domain_data = &gpd_data->base;
+ gpd_data->base.dev = dev;
+ gpd_data->need_restore = false;
+ list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);

out:
genpd_release_lock(genpd);
@@ -1152,6 +1161,7 @@ int pm_genpd_remove_device(struct generi
pdd->dev = NULL;
dev_pm_put_subsys_data(dev);
dev->pm_domain = NULL;
+ kfree(to_gpd_data(pdd));

genpd->device_count--;



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