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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-02-10 18:09:44 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-02-10 18:09:44 +0300
commitf7cc61f0667a26a2a02ba0a2b5f977070378e324 (patch)
treeb48a9e64e047e2cd2a819604200793e6f404adee /drivers/base
parent740b68ea3ab7a55907e06b8b5b9a67082e345932 (diff)
parent1e95e3b2da424db68d0a465273f1901a990c6277 (diff)
downloadlinux-f7cc61f0667a26a2a02ba0a2b5f977070378e324.tar.xz
Merge branch 'pm-domains'
* 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
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/common.c18
-rw-r--r--drivers/base/power/domain.c157
2 files changed, 71 insertions, 104 deletions
diff --git a/drivers/base/power/common.c b/drivers/base/power/common.c
index b0f138806bbc..f32b802b98f4 100644
--- a/drivers/base/power/common.c
+++ b/drivers/base/power/common.c
@@ -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);
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 0d8780c04a5e..ba4abbe4693c 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -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;
+ }
+
+ if (td)
+ gpd_data->td = *td;
- mutex_init(&gpd_data->lock);
+ 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) {
@@ -1527,58 +1536,22 @@ 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.
* @subdomain: Subdomain to be added.