Merge branch 'pm-domains'

* pm-domains:
  PM / Domains: Fix build warning for CONFIG_PM_RUNTIME unset
  PM / Domains: Replace plain integer with NULL pointer in domain.c file
  PM / Domains: Add missing static storage class specifier in domain.c file
  PM / Domains: Allow device callbacks to be added at any time
  PM / Domains: Add device domain data reference counter
  PM / Domains: Add preliminary support for cpuidle, v2
  PM / Domains: Do not stop devices after restoring their states
  PM / Domains: Use subsystem runtime suspend/resume callbacks by default

1 files changed, 268 insertions, 74 deletions

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 83aa694a8efe..ba3487c9835b 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -75,19 +75,6 @@ static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev)
                                         start_latency_ns, "start");
 }
 
-static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev)
-{
-        return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev,
-                                        save_state_latency_ns, "state save");
-}
-
-static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev)
-{
-        return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev,
-                                        restore_state_latency_ns,
-                                        "state restore");
-}
-
 static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
 {
         bool ret = false;
@@ -139,6 +126,19 @@ static void genpd_set_active(struct generic_pm_domain *genpd)
                 genpd->status = GPD_STATE_ACTIVE;
 }
 
+static void genpd_recalc_cpu_exit_latency(struct generic_pm_domain *genpd)
+{
+        s64 usecs64;
+
+        if (!genpd->cpu_data)
+                return;
+
+        usecs64 = genpd->power_on_latency_ns;
+        do_div(usecs64, NSEC_PER_USEC);
+        usecs64 += genpd->cpu_data->saved_exit_latency;
+        genpd->cpu_data->idle_state->exit_latency = usecs64;
+}
+
 /**
  * __pm_genpd_poweron - Restore power to a given PM domain and its masters.
  * @genpd: PM domain to power up.
@@ -146,7 +146,7 @@ static void genpd_set_active(struct generic_pm_domain *genpd)
  * Restore power to @genpd and all of its masters so that it is possible to
  * resume a device belonging to it.
  */
-int __pm_genpd_poweron(struct generic_pm_domain *genpd)
+static int __pm_genpd_poweron(struct generic_pm_domain *genpd)
         __releases(&genpd->lock) __acquires(&genpd->lock)
 {
         struct gpd_link *link;
@@ -176,6 +176,13 @@ int __pm_genpd_poweron(struct generic_pm_domain *genpd)
                 return 0;
         }
 
+        if (genpd->cpu_data) {
+                cpuidle_pause_and_lock();
+                genpd->cpu_data->idle_state->disabled = true;
+                cpuidle_resume_and_unlock();
+                goto out;
+        }
+
         /*
          * The list is guaranteed not to change while the loop below is being
          * executed, unless one of the masters' .power_on() callbacks fiddles
@@ -215,6 +222,7 @@ int __pm_genpd_poweron(struct generic_pm_domain *genpd)
                 if (elapsed_ns > genpd->power_on_latency_ns) {
                         genpd->power_on_latency_ns = elapsed_ns;
                         genpd->max_off_time_changed = true;
+                        genpd_recalc_cpu_exit_latency(genpd);
                         if (genpd->name)
                                 pr_warning("%s: Power-on latency exceeded, "
                                         "new value %lld ns\n", genpd->name,
@@ -222,6 +230,7 @@ int __pm_genpd_poweron(struct generic_pm_domain *genpd)
                 }
         }
 
+ out:
         genpd_set_active(genpd);
 
         return 0;
@@ -251,6 +260,19 @@ int pm_genpd_poweron(struct generic_pm_domain *genpd)
 
 #ifdef CONFIG_PM_RUNTIME
 
+static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev)
+{
+        return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev,
+                                        save_state_latency_ns, "state save");
+}
+
+static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev)
+{
+        return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev,
+                                        restore_state_latency_ns,
+                                        "state restore");
+}
+
 static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
                                      unsigned long val, void *ptr)
 {
@@ -275,7 +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 {
@@ -339,19 +361,16 @@ static void __pm_genpd_restore_device(struct pm_domain_data *pdd,
 {
         struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
         struct device *dev = pdd->dev;
+        bool need_restore = gpd_data->need_restore;
 
-        if (!gpd_data->need_restore)
-                return;
-
+        gpd_data->need_restore = false;
         mutex_unlock(&genpd->lock);
 
         genpd_start_dev(genpd, dev);
-        genpd_restore_dev(genpd, dev);
-        genpd_stop_dev(genpd, dev);
+        if (need_restore)
+                genpd_restore_dev(genpd, dev);
 
         mutex_lock(&genpd->lock);
-
-        gpd_data->need_restore = false;
 }
 
 /**
@@ -458,6 +477,21 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
                 }
         }
 
+        if (genpd->cpu_data) {
+                /*
+                 * If cpu_data is set, cpuidle should turn the domain off when
+                 * the CPU in it is idle.  In that case we don't decrement the
+                 * subdomain counts of the master domains, so that power is not
+                 * removed from the current domain prematurely as a result of
+                 * cutting off the masters' power.
+                 */
+                genpd->status = GPD_STATE_POWER_OFF;
+                cpuidle_pause_and_lock();
+                genpd->cpu_data->idle_state->disabled = false;
+                cpuidle_resume_and_unlock();
+                goto out;
+        }
+
         if (genpd->power_off) {
                 ktime_t time_start;
                 s64 elapsed_ns;
@@ -595,7 +629,7 @@ static int pm_genpd_runtime_resume(struct device *dev)
 
         /* If power.irq_safe, the PM domain is never powered off. */
         if (dev->power.irq_safe)
-                goto out;
+                return genpd_start_dev(genpd, dev);
 
         mutex_lock(&genpd->lock);
         ret = __pm_genpd_poweron(genpd);
@@ -628,9 +662,6 @@ static int pm_genpd_runtime_resume(struct device *dev)
         wake_up_all(&genpd->status_wait_queue);
         mutex_unlock(&genpd->lock);
 
- out:
-        genpd_start_dev(genpd, dev);
-
         return 0;
 }
 
@@ -1235,6 +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.
@@ -1244,7 +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;
 
@@ -1253,14 +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) {
@@ -1274,35 +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;
 }
 
@@ -1348,6 +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__);
@@ -1368,22 +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:
@@ -1541,33 +1603,52 @@ int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
  * @dev: Device to add the callbacks to.
  * @ops: Set of callbacks to add.
  * @td: Timing data to add to the device along with the callbacks (optional).
+ *
+ * Every call to this routine should be balanced with a call to
+ * __pm_genpd_remove_callbacks() and they must not be nested.
  */
 int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops,
                            struct gpd_timing_data *td)
 {
-        struct pm_domain_data *pdd;
+        struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL;
         int ret = 0;
 
-        if (!(dev && dev->power.subsys_data && ops))
+        if (!(dev && ops))
                 return -EINVAL;
 
+        gpd_data_new = __pm_genpd_alloc_dev_data(dev);
+        if (!gpd_data_new)
+                return -ENOMEM;
+
         pm_runtime_disable(dev);
         device_pm_lock();
 
-        pdd = dev->power.subsys_data->domain_data;
-        if (pdd) {
-                struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
+        ret = dev_pm_get_subsys_data(dev);
+        if (ret)
+                goto out;
 
-                gpd_data->ops = *ops;
-                if (td)
-                        gpd_data->td = *td;
+        spin_lock_irq(&dev->power.lock);
+
+        if (dev->power.subsys_data->domain_data) {
+                gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
         } else {
-                ret = -EINVAL;
+                gpd_data = gpd_data_new;
+                dev->power.subsys_data->domain_data = &gpd_data->base;
         }
+        gpd_data->refcount++;
+        gpd_data->ops = *ops;
+        if (td)
+                gpd_data->td = *td;
+
+        spin_unlock_irq(&dev->power.lock);
 
+ out:
         device_pm_unlock();
         pm_runtime_enable(dev);
 
+        if (gpd_data != gpd_data_new)
+                __pm_genpd_free_dev_data(dev, gpd_data_new);
+
         return ret;
 }
 EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks);
@@ -1576,10 +1657,13 @@ EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks);
  * __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device.
  * @dev: Device to remove the callbacks from.
  * @clear_td: If set, clear the device's timing data too.
+ *
+ * This routine can only be called after pm_genpd_add_callbacks().
  */
 int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
 {
-        struct pm_domain_data *pdd;
+        struct generic_pm_domain_data *gpd_data = NULL;
+        bool remove = false;
         int ret = 0;
 
         if (!(dev && dev->power.subsys_data))
@@ -1588,24 +1672,118 @@ int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
         pm_runtime_disable(dev);
         device_pm_lock();
 
-        pdd = dev->power.subsys_data->domain_data;
-        if (pdd) {
-                struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
+        spin_lock_irq(&dev->power.lock);
 
-                gpd_data->ops = (struct gpd_dev_ops){ 0 };
+        if (dev->power.subsys_data->domain_data) {
+                gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
+                gpd_data->ops = (struct gpd_dev_ops){ NULL };
                 if (clear_td)
                         gpd_data->td = (struct gpd_timing_data){ 0 };
+
+                if (--gpd_data->refcount == 0) {
+                        dev->power.subsys_data->domain_data = NULL;
+                        remove = true;
+                }
         } else {
                 ret = -EINVAL;
         }
 
+        spin_unlock_irq(&dev->power.lock);
+
         device_pm_unlock();
         pm_runtime_enable(dev);
 
-        return ret;
+        if (ret)
+                return ret;
+
+        dev_pm_put_subsys_data(dev);
+        if (remove)
+                __pm_genpd_free_dev_data(dev, gpd_data);
+
+        return 0;
 }
 EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks);
 
+int genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state)
+{
+        struct cpuidle_driver *cpuidle_drv;
+        struct gpd_cpu_data *cpu_data;
+        struct cpuidle_state *idle_state;
+        int ret = 0;
+
+        if (IS_ERR_OR_NULL(genpd) || state < 0)
+                return -EINVAL;
+
+        genpd_acquire_lock(genpd);
+
+        if (genpd->cpu_data) {
+                ret = -EEXIST;
+                goto out;
+        }
+        cpu_data = kzalloc(sizeof(*cpu_data), GFP_KERNEL);
+        if (!cpu_data) {
+                ret = -ENOMEM;
+                goto out;
+        }
+        cpuidle_drv = cpuidle_driver_ref();
+        if (!cpuidle_drv) {
+                ret = -ENODEV;
+                goto out;
+        }
+        if (cpuidle_drv->state_count <= state) {
+                ret = -EINVAL;
+                goto err;
+        }
+        idle_state = &cpuidle_drv->states[state];
+        if (!idle_state->disabled) {
+                ret = -EAGAIN;
+                goto err;
+        }
+        cpu_data->idle_state = idle_state;
+        cpu_data->saved_exit_latency = idle_state->exit_latency;
+        genpd->cpu_data = cpu_data;
+        genpd_recalc_cpu_exit_latency(genpd);
+
+ out:
+        genpd_release_lock(genpd);
+        return ret;
+
+ err:
+        cpuidle_driver_unref();
+        goto out;
+}
+
+int genpd_detach_cpuidle(struct generic_pm_domain *genpd)
+{
+        struct gpd_cpu_data *cpu_data;
+        struct cpuidle_state *idle_state;
+        int ret = 0;
+
+        if (IS_ERR_OR_NULL(genpd))
+                return -EINVAL;
+
+        genpd_acquire_lock(genpd);
+
+        cpu_data = genpd->cpu_data;
+        if (!cpu_data) {
+                ret = -ENODEV;
+                goto out;
+        }
+        idle_state = cpu_data->idle_state;
+        if (!idle_state->disabled) {
+                ret = -EAGAIN;
+                goto out;
+        }
+        idle_state->exit_latency = cpu_data->saved_exit_latency;
+        cpuidle_driver_unref();
+        genpd->cpu_data = NULL;
+        kfree(cpu_data);
+
+ out:
+        genpd_release_lock(genpd);
+        return ret;
+}
+
 /* Default device callbacks for generic PM domains. */
 
 /**
@@ -1615,16 +1793,24 @@ EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks);
 static int pm_genpd_default_save_state(struct device *dev)
 {
         int (*cb)(struct device *__dev);
-        struct device_driver *drv = dev->driver;
 
         cb = dev_gpd_data(dev)->ops.save_state;
         if (cb)
                 return cb(dev);
 
-        if (drv && drv->pm && drv->pm->runtime_suspend)
-                return drv->pm->runtime_suspend(dev);
+        if (dev->type && dev->type->pm)
+                cb = dev->type->pm->runtime_suspend;
+        else if (dev->class && dev->class->pm)
+                cb = dev->class->pm->runtime_suspend;
+        else if (dev->bus && dev->bus->pm)
+                cb = dev->bus->pm->runtime_suspend;
+        else
+                cb = NULL;
 
-        return 0;
+        if (!cb && dev->driver && dev->driver->pm)
+                cb = dev->driver->pm->runtime_suspend;
+
+        return cb ? cb(dev) : 0;
 }
 
 /**
@@ -1634,16 +1820,24 @@ static int pm_genpd_default_save_state(struct device *dev)
 static int pm_genpd_default_restore_state(struct device *dev)
 {
         int (*cb)(struct device *__dev);
-        struct device_driver *drv = dev->driver;
 
         cb = dev_gpd_data(dev)->ops.restore_state;
         if (cb)
                 return cb(dev);
 
-        if (drv && drv->pm && drv->pm->runtime_resume)
-                return drv->pm->runtime_resume(dev);
+        if (dev->type && dev->type->pm)
+                cb = dev->type->pm->runtime_resume;
+        else if (dev->class && dev->class->pm)
+                cb = dev->class->pm->runtime_resume;
+        else if (dev->bus && dev->bus->pm)
+                cb = dev->bus->pm->runtime_resume;
+        else
+                cb = NULL;
 
-        return 0;
+        if (!cb && dev->driver && dev->driver->pm)
+                cb = dev->driver->pm->runtime_resume;
+
+        return cb ? cb(dev) : 0;
 }
 
 #ifdef CONFIG_PM_SLEEP