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author | Rafael J. Wysocki <rjw@sisk.pl> | 2012-07-05 22:12:32 +0200 |
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committer | Rafael J. Wysocki <rjw@sisk.pl> | 2012-07-05 22:12:32 +0200 |
commit | 1d5fcfec22ce5f69db0d29284d2b65ff8ab1bfaa (patch) | |
tree | 907136239832a60a2f7af6e6dd442fdc3ac0f034 /drivers/base | |
parent | cbc9ef0287ab764d3da0129efa673808df641fe3 (diff) | |
download | op-kernel-dev-1d5fcfec22ce5f69db0d29284d2b65ff8ab1bfaa.zip op-kernel-dev-1d5fcfec22ce5f69db0d29284d2b65ff8ab1bfaa.tar.gz |
PM / Domains: Add device domain data reference counter
Add a mechanism for counting references to the
struct generic_pm_domain_data object pointed to by
dev->power.subsys_data->domain_data if the device in question
belongs to a generic PM domain.
This change is necessary for a subsequent patch making it possible to
allocate that object from within pm_genpd_add_callbacks(), so that
drivers can attach their PM domain device callbacks to devices before
those devices are added to PM domains.
This patch has been tested on the SH7372 Mackerel board.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/base')
-rw-r--r-- | drivers/base/power/domain.c | 83 |
1 files changed, 57 insertions, 26 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 4b5f090..45eb3b1 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -297,7 +297,7 @@ static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, pdd = dev->power.subsys_data ? dev->power.subsys_data->domain_data : NULL; - if (pdd) { + if (pdd && pdd->dev) { to_gpd_data(pdd)->td.constraint_changed = true; genpd = dev_to_genpd(dev); } else { @@ -1266,6 +1266,27 @@ static void pm_genpd_complete(struct device *dev) #endif /* CONFIG_PM_SLEEP */ +static struct generic_pm_domain_data *__pm_genpd_alloc_dev_data(struct device *dev) +{ + struct generic_pm_domain_data *gpd_data; + + gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); + if (!gpd_data) + return NULL; + + mutex_init(&gpd_data->lock); + gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; + dev_pm_qos_add_notifier(dev, &gpd_data->nb); + return gpd_data; +} + +static void __pm_genpd_free_dev_data(struct device *dev, + struct generic_pm_domain_data *gpd_data) +{ + dev_pm_qos_remove_notifier(dev, &gpd_data->nb); + kfree(gpd_data); +} + /** * __pm_genpd_add_device - Add a device to an I/O PM domain. * @genpd: PM domain to add the device to. @@ -1275,7 +1296,7 @@ static void pm_genpd_complete(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; + struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL; struct pm_domain_data *pdd; int ret = 0; @@ -1284,14 +1305,10 @@ 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 = kzalloc(sizeof(*gpd_data), GFP_KERNEL); - if (!gpd_data) + gpd_data_new = __pm_genpd_alloc_dev_data(dev); + if (!gpd_data_new) return -ENOMEM; - mutex_init(&gpd_data->lock); - gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; - dev_pm_qos_add_notifier(dev, &gpd_data->nb); - genpd_acquire_lock(genpd); if (genpd->prepared_count > 0) { @@ -1305,35 +1322,42 @@ int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, goto out; } + ret = dev_pm_get_subsys_data(dev); + if (ret) + goto out; + genpd->device_count++; genpd->max_off_time_changed = true; - dev_pm_get_subsys_data(dev); - - mutex_lock(&gpd_data->lock); spin_lock_irq(&dev->power.lock); + dev->pm_domain = &genpd->domain; - dev->power.subsys_data->domain_data = &gpd_data->base; - gpd_data->base.dev = dev; - list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); - gpd_data->need_restore = genpd->status == GPD_STATE_POWER_OFF; + 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); + + 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 = genpd->status == GPD_STATE_POWER_OFF; gpd_data->td.constraint_changed = true; gpd_data->td.effective_constraint_ns = -1; - spin_unlock_irq(&dev->power.lock); mutex_unlock(&gpd_data->lock); - genpd_release_lock(genpd); - - return 0; - out: genpd_release_lock(genpd); - dev_pm_qos_remove_notifier(dev, &gpd_data->nb); - kfree(gpd_data); + if (gpd_data != gpd_data_new) + __pm_genpd_free_dev_data(dev, gpd_data_new); + return ret; } @@ -1379,6 +1403,7 @@ 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__); @@ -1399,22 +1424,28 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd, genpd->max_off_time_changed = true; spin_lock_irq(&dev->power.lock); + dev->pm_domain = NULL; pdd = dev->power.subsys_data->domain_data; list_del_init(&pdd->list_node); - dev->power.subsys_data->domain_data = NULL; + 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); - gpd_data = to_gpd_data(pdd); mutex_lock(&gpd_data->lock); pdd->dev = NULL; mutex_unlock(&gpd_data->lock); genpd_release_lock(genpd); - dev_pm_qos_remove_notifier(dev, &gpd_data->nb); - kfree(gpd_data); dev_pm_put_subsys_data(dev); + if (remove) + __pm_genpd_free_dev_data(dev, gpd_data); + return 0; out: |