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Merge branch 'pm-domains'

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* pm-domains:
  PM: Convert dev_pm_put_subsys_data() into a void function
  PM: Update function header for dev_pm_get_subsys_data()
  PM / Domains: Handle errors from genpd's ->attach_dev() callback
  PM / Domains: Re-order initialization of generic_pm_domain_data
  PM / Domains: Free pm_subsys_data in error path in __pm_genpd_add_device()
  PM / Domains: Eliminate the mutex for the generic_pm_domain_data
  PM / Domains: Don't check for an existing device when adding a new
  PM / Domains: Don't allow an existing generic_pm_domain_data
  PM / Domains: Remove reference counting for the generic_pm_domain_data
  PM / Domains: Rename __pm_genpd_alloc|free_dev_data()
  PM / Domains: Remove pm_genpd_dev_need_restore() API
This commit is contained in:
Rafael J. Wysocki 2015-02-10 16:09:44 +01:00
commit f7cc61f066
4 changed files with 72 additions and 109 deletions
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18
drivers/base/power/common.c
View File

@ -19,8 +19,8 @@
* @dev: Device to handle.
*
* If power.subsys_data is NULL, point it to a new object, otherwise increment
* its reference counter. Return 1 if a new object has been created, otherwise
* return 0 or error code.
* its reference counter. Return 0 if new object has been created or refcount
* increased, otherwise negative error code.
*/
int dev_pm_get_subsys_data(struct device *dev)
{
@ -56,13 +56,11 @@ EXPORT_SYMBOL_GPL(dev_pm_get_subsys_data);
* @dev: Device to handle.
*
* If the reference counter of power.subsys_data is zero after dropping the
* reference, power.subsys_data is removed. Return 1 if that happens or 0
* otherwise.
* reference, power.subsys_data is removed.
*/
int dev_pm_put_subsys_data(struct device *dev)
void dev_pm_put_subsys_data(struct device *dev)
{
struct pm_subsys_data *psd;
int ret = 1;
spin_lock_irq(&dev->power.lock);
@ -70,18 +68,14 @@ int dev_pm_put_subsys_data(struct device *dev)
if (!psd)
goto out;
if (--psd->refcount == 0) {
if (--psd->refcount == 0)
dev->power.subsys_data = NULL;
} else {
else
psd = NULL;
ret = 0;
}
out:
spin_unlock_irq(&dev->power.lock);
kfree(psd);
return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_put_subsys_data);

157
drivers/base/power/domain.c
View File

@ -344,14 +344,7 @@ static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
struct device *dev;
gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
mutex_lock(&gpd_data->lock);
dev = gpd_data->base.dev;
if (!dev) {
mutex_unlock(&gpd_data->lock);
return NOTIFY_DONE;
}
mutex_unlock(&gpd_data->lock);
for (;;) {
struct generic_pm_domain *genpd;
@ -1384,25 +1377,66 @@ EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron);
#endif /* CONFIG_PM_SLEEP */
static struct generic_pm_domain_data *__pm_genpd_alloc_dev_data(struct device *dev)
static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev,
struct generic_pm_domain *genpd,
struct gpd_timing_data *td)
{
struct generic_pm_domain_data *gpd_data;
int ret;
ret = dev_pm_get_subsys_data(dev);
if (ret)
return ERR_PTR(ret);
gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
if (!gpd_data)
return NULL;
if (!gpd_data) {
ret = -ENOMEM;
goto err_put;
}
mutex_init(&gpd_data->lock);
if (td)
gpd_data->td = *td;
gpd_data->base.dev = dev;
gpd_data->need_restore = -1;
gpd_data->td.constraint_changed = true;
gpd_data->td.effective_constraint_ns = -1;
gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
dev_pm_qos_add_notifier(dev, &gpd_data->nb);
spin_lock_irq(&dev->power.lock);
if (dev->power.subsys_data->domain_data) {
ret = -EINVAL;
goto err_free;
}
dev->power.subsys_data->domain_data = &gpd_data->base;
dev->pm_domain = &genpd->domain;
spin_unlock_irq(&dev->power.lock);
return gpd_data;
err_free:
spin_unlock_irq(&dev->power.lock);
kfree(gpd_data);
err_put:
dev_pm_put_subsys_data(dev);
return ERR_PTR(ret);
}
static void __pm_genpd_free_dev_data(struct device *dev,
struct generic_pm_domain_data *gpd_data)
static void genpd_free_dev_data(struct device *dev,
struct generic_pm_domain_data *gpd_data)
{
dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
spin_lock_irq(&dev->power.lock);
dev->pm_domain = NULL;
dev->power.subsys_data->domain_data = NULL;
spin_unlock_irq(&dev->power.lock);
kfree(gpd_data);
dev_pm_put_subsys_data(dev);
}
/**
@ -1414,8 +1448,7 @@ static void __pm_genpd_free_dev_data(struct device *dev,
int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
struct gpd_timing_data *td)
{
struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL;
struct pm_domain_data *pdd;
struct generic_pm_domain_data *gpd_data;
int ret = 0;
dev_dbg(dev, "%s()\n", __func__);
@ -1423,9 +1456,9 @@ int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
return -EINVAL;
gpd_data_new = __pm_genpd_alloc_dev_data(dev);
if (!gpd_data_new)
return -ENOMEM;
gpd_data = genpd_alloc_dev_data(dev, genpd, td);
if (IS_ERR(gpd_data))
return PTR_ERR(gpd_data);
genpd_acquire_lock(genpd);
@ -1434,50 +1467,22 @@ int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
goto out;
}
list_for_each_entry(pdd, &genpd->dev_list, list_node)
if (pdd->dev == dev) {
ret = -EINVAL;
goto out;
}
ret = dev_pm_get_subsys_data(dev);
ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0;
if (ret)
goto out;
genpd->device_count++;
genpd->max_off_time_changed = true;
spin_lock_irq(&dev->power.lock);
dev->pm_domain = &genpd->domain;
if (dev->power.subsys_data->domain_data) {
gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
} else {
gpd_data = gpd_data_new;
dev->power.subsys_data->domain_data = &gpd_data->base;
}
gpd_data->refcount++;
if (td)
gpd_data->td = *td;
spin_unlock_irq(&dev->power.lock);
if (genpd->attach_dev)
genpd->attach_dev(genpd, dev);
mutex_lock(&gpd_data->lock);
gpd_data->base.dev = dev;
list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
gpd_data->need_restore = -1;
gpd_data->td.constraint_changed = true;
gpd_data->td.effective_constraint_ns = -1;
mutex_unlock(&gpd_data->lock);
out:
genpd_release_lock(genpd);
if (gpd_data != gpd_data_new)
__pm_genpd_free_dev_data(dev, gpd_data_new);
if (ret)
genpd_free_dev_data(dev, gpd_data);
else
dev_pm_qos_add_notifier(dev, &gpd_data->nb);
return ret;
}
@ -1504,7 +1509,6 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
{
struct generic_pm_domain_data *gpd_data;
struct pm_domain_data *pdd;
bool remove = false;
int ret = 0;
dev_dbg(dev, "%s()\n", __func__);
@ -1514,6 +1518,11 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
|| pd_to_genpd(dev->pm_domain) != genpd)
return -EINVAL;
/* The above validation also means we have existing domain_data. */
pdd = dev->power.subsys_data->domain_data;
gpd_data = to_gpd_data(pdd);
dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
genpd_acquire_lock(genpd);
if (genpd->prepared_count > 0) {
@ -1527,57 +1536,21 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
if (genpd->detach_dev)
genpd->detach_dev(genpd, dev);
spin_lock_irq(&dev->power.lock);
dev->pm_domain = NULL;
pdd = dev->power.subsys_data->domain_data;
list_del_init(&pdd->list_node);
gpd_data = to_gpd_data(pdd);
if (--gpd_data->refcount == 0) {
dev->power.subsys_data->domain_data = NULL;
remove = true;
}
spin_unlock_irq(&dev->power.lock);
mutex_lock(&gpd_data->lock);
pdd->dev = NULL;
mutex_unlock(&gpd_data->lock);
genpd_release_lock(genpd);
dev_pm_put_subsys_data(dev);
if (remove)
__pm_genpd_free_dev_data(dev, gpd_data);
genpd_free_dev_data(dev, gpd_data);
return 0;
out:
genpd_release_lock(genpd);
dev_pm_qos_add_notifier(dev, &gpd_data->nb);
return ret;
}
/**
* pm_genpd_dev_need_restore - Set/unset the device's "need restore" flag.
* @dev: Device to set/unset the flag for.
* @val: The new value of the device's "need restore" flag.
*/
void pm_genpd_dev_need_restore(struct device *dev, bool val)
{
struct pm_subsys_data *psd;
unsigned long flags;
spin_lock_irqsave(&dev->power.lock, flags);
psd = dev_to_psd(dev);
if (psd && psd->domain_data)
to_gpd_data(psd->domain_data)->need_restore = val ? 1 : 0;
spin_unlock_irqrestore(&dev->power.lock, flags);
}
EXPORT_SYMBOL_GPL(pm_genpd_dev_need_restore);
/**
* pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
* @genpd: Master PM domain to add the subdomain to.

2
include/linux/pm.h
View File

@ -597,7 +597,7 @@ struct dev_pm_info {
extern void update_pm_runtime_accounting(struct device *dev);
extern int dev_pm_get_subsys_data(struct device *dev);
extern int dev_pm_put_subsys_data(struct device *dev);
extern void dev_pm_put_subsys_data(struct device *dev);
/*
* Power domains provide callbacks that are executed during system suspend,

4
include/linux/pm_domain.h
View File

@ -113,8 +113,6 @@ struct generic_pm_domain_data {
struct pm_domain_data base;
struct gpd_timing_data td;
struct notifier_block nb;
struct mutex lock;
unsigned int refcount;
int need_restore;
};
@ -140,7 +138,6 @@ extern int __pm_genpd_name_add_device(const char *domain_name,
extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
struct device *dev);
extern void pm_genpd_dev_need_restore(struct device *dev, bool val);
extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
struct generic_pm_domain *new_subdomain);
extern int pm_genpd_add_subdomain_names(const char *master_name,
@ -187,7 +184,6 @@ static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
{
return -ENOSYS;
}
static inline void pm_genpd_dev_need_restore(struct device *dev, bool val) {}
static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
struct generic_pm_domain *new_sd)
{