PM: Introduce generic "noirq" callback routines for subsystems (v2)

Introduce generic "noirq" power management callback routines for
subsystems in addition to the "regular" generic PM callback routines.

The new routines will be used, among other things, for implementing
system-wide PM transitions support for generic PM domains.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

1 files changed, 83 insertions, 15 deletions

diff --git a/drivers/base/power/generic_ops.c b/drivers/base/power/generic_ops.c
index cb3bb368681c..9508df71274b 100644
--- a/drivers/base/power/generic_ops.c
+++ b/drivers/base/power/generic_ops.c
@@ -94,12 +94,13 @@ int pm_generic_prepare(struct device *dev)
  * __pm_generic_call - Generic suspend/freeze/poweroff/thaw subsystem callback.
  * @dev: Device to handle.
  * @event: PM transition of the system under way.
+ * @bool: Whether or not this is the "noirq" stage.
  *
  * If the device has not been suspended at run time, execute the
  * suspend/freeze/poweroff/thaw callback provided by its driver, if defined, and
  * return its error code.  Otherwise, return zero.
  */
-static int __pm_generic_call(struct device *dev, int event)
+static int __pm_generic_call(struct device *dev, int event, bool noirq)
 {
         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
         int (*callback)(struct device *);
@@ -109,16 +110,16 @@ static int __pm_generic_call(struct device *dev, int event)
 
         switch (event) {
         case PM_EVENT_SUSPEND:
-                callback = pm->suspend;
+                callback = noirq ? pm->suspend_noirq : pm->suspend;
                 break;
         case PM_EVENT_FREEZE:
-                callback = pm->freeze;
+                callback = noirq ? pm->freeze_noirq : pm->freeze;
                 break;
         case PM_EVENT_HIBERNATE:
-                callback = pm->poweroff;
+                callback = noirq ? pm->poweroff_noirq : pm->poweroff;
                 break;
         case PM_EVENT_THAW:
-                callback = pm->thaw;
+                callback = noirq ? pm->thaw_noirq : pm->thaw;
                 break;
         default:
                 callback = NULL;
@@ -129,42 +130,82 @@ static int __pm_generic_call(struct device *dev, int event)
 }
 
 /**
+ * pm_generic_suspend_noirq - Generic suspend_noirq callback for subsystems.
+ * @dev: Device to suspend.
+ */
+int pm_generic_suspend_noirq(struct device *dev)
+{
+        return __pm_generic_call(dev, PM_EVENT_SUSPEND, true);
+}
+EXPORT_SYMBOL_GPL(pm_generic_suspend_noirq);
+
+/**
  * pm_generic_suspend - Generic suspend callback for subsystems.
  * @dev: Device to suspend.
  */
 int pm_generic_suspend(struct device *dev)
 {
-        return __pm_generic_call(dev, PM_EVENT_SUSPEND);
+        return __pm_generic_call(dev, PM_EVENT_SUSPEND, false);
 }
 EXPORT_SYMBOL_GPL(pm_generic_suspend);
 
 /**
+ * pm_generic_freeze_noirq - Generic freeze_noirq callback for subsystems.
+ * @dev: Device to freeze.
+ */
+int pm_generic_freeze_noirq(struct device *dev)
+{
+        return __pm_generic_call(dev, PM_EVENT_FREEZE, true);
+}
+EXPORT_SYMBOL_GPL(pm_generic_freeze_noirq);
+
+/**
  * pm_generic_freeze - Generic freeze callback for subsystems.
  * @dev: Device to freeze.
  */
 int pm_generic_freeze(struct device *dev)
 {
-        return __pm_generic_call(dev, PM_EVENT_FREEZE);
+        return __pm_generic_call(dev, PM_EVENT_FREEZE, false);
 }
 EXPORT_SYMBOL_GPL(pm_generic_freeze);
 
 /**
+ * pm_generic_poweroff_noirq - Generic poweroff_noirq callback for subsystems.
+ * @dev: Device to handle.
+ */
+int pm_generic_poweroff_noirq(struct device *dev)
+{
+        return __pm_generic_call(dev, PM_EVENT_HIBERNATE, true);
+}
+EXPORT_SYMBOL_GPL(pm_generic_poweroff_noirq);
+
+/**
  * pm_generic_poweroff - Generic poweroff callback for subsystems.
  * @dev: Device to handle.
  */
 int pm_generic_poweroff(struct device *dev)
 {
-        return __pm_generic_call(dev, PM_EVENT_HIBERNATE);
+        return __pm_generic_call(dev, PM_EVENT_HIBERNATE, false);
 }
 EXPORT_SYMBOL_GPL(pm_generic_poweroff);
 
 /**
+ * pm_generic_thaw_noirq - Generic thaw_noirq callback for subsystems.
+ * @dev: Device to thaw.
+ */
+int pm_generic_thaw_noirq(struct device *dev)
+{
+        return __pm_generic_call(dev, PM_EVENT_THAW, true);
+}
+EXPORT_SYMBOL_GPL(pm_generic_thaw_noirq);
+
+/**
  * pm_generic_thaw - Generic thaw callback for subsystems.
  * @dev: Device to thaw.
  */
 int pm_generic_thaw(struct device *dev)
 {
-        return __pm_generic_call(dev, PM_EVENT_THAW);
+        return __pm_generic_call(dev, PM_EVENT_THAW, false);
 }
 EXPORT_SYMBOL_GPL(pm_generic_thaw);
 
@@ -172,12 +213,13 @@ EXPORT_SYMBOL_GPL(pm_generic_thaw);
  * __pm_generic_resume - Generic resume/restore callback for subsystems.
  * @dev: Device to handle.
  * @event: PM transition of the system under way.
+ * @bool: Whether or not this is the "noirq" stage.
  *
  * Execute the resume/resotre callback provided by the @dev's driver, if
  * defined.  If it returns 0, change the device's runtime PM status to 'active'.
  * Return the callback's error code.
  */
-static int __pm_generic_resume(struct device *dev, int event)
+static int __pm_generic_resume(struct device *dev, int event, bool noirq)
 {
         const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
         int (*callback)(struct device *);
@@ -188,10 +230,10 @@ static int __pm_generic_resume(struct device *dev, int event)
 
         switch (event) {
         case PM_EVENT_RESUME:
-                callback = pm->resume;
+                callback = noirq ? pm->resume_noirq : pm->resume;
                 break;
         case PM_EVENT_RESTORE:
-                callback = pm->restore;
+                callback = noirq ? pm->restore_noirq : pm->restore;
                 break;
         default:
                 callback = NULL;
@@ -202,7 +244,7 @@ static int __pm_generic_resume(struct device *dev, int event)
                 return 0;
 
         ret = callback(dev);
-        if (!ret && pm_runtime_enabled(dev)) {
+        if (!ret && !noirq && pm_runtime_enabled(dev)) {
                 pm_runtime_disable(dev);
                 pm_runtime_set_active(dev);
                 pm_runtime_enable(dev);
@@ -212,22 +254,42 @@ static int __pm_generic_resume(struct device *dev, int event)
 }
 
 /**
+ * pm_generic_resume_noirq - Generic resume_noirq callback for subsystems.
+ * @dev: Device to resume.
+ */
+int pm_generic_resume_noirq(struct device *dev)
+{
+        return __pm_generic_resume(dev, PM_EVENT_RESUME, true);
+}
+EXPORT_SYMBOL_GPL(pm_generic_resume_noirq);
+
+/**
  * pm_generic_resume - Generic resume callback for subsystems.
  * @dev: Device to resume.
  */
 int pm_generic_resume(struct device *dev)
 {
-        return __pm_generic_resume(dev, PM_EVENT_RESUME);
+        return __pm_generic_resume(dev, PM_EVENT_RESUME, false);
 }
 EXPORT_SYMBOL_GPL(pm_generic_resume);
 
 /**
+ * pm_generic_restore_noirq - Generic restore_noirq callback for subsystems.
+ * @dev: Device to restore.
+ */
+int pm_generic_restore_noirq(struct device *dev)
+{
+        return __pm_generic_resume(dev, PM_EVENT_RESTORE, true);
+}
+EXPORT_SYMBOL_GPL(pm_generic_restore_noirq);
+
+/**
  * pm_generic_restore - Generic restore callback for subsystems.
  * @dev: Device to restore.
  */
 int pm_generic_restore(struct device *dev)
 {
-        return __pm_generic_resume(dev, PM_EVENT_RESTORE);
+        return __pm_generic_resume(dev, PM_EVENT_RESTORE, false);
 }
 EXPORT_SYMBOL_GPL(pm_generic_restore);
 
@@ -256,11 +318,17 @@ struct dev_pm_ops generic_subsys_pm_ops = {
 #ifdef CONFIG_PM_SLEEP
         .prepare = pm_generic_prepare,
         .suspend = pm_generic_suspend,
+        .suspend_noirq = pm_generic_suspend_noirq,
         .resume = pm_generic_resume,
+        .resume_noirq = pm_generic_resume_noirq,
         .freeze = pm_generic_freeze,
+        .freeze_noirq = pm_generic_freeze_noirq,
         .thaw = pm_generic_thaw,
+        .thaw_noirq = pm_generic_thaw_noirq,
         .poweroff = pm_generic_poweroff,
+        .poweroff_noirq = pm_generic_poweroff_noirq,
         .restore = pm_generic_restore,
+        .restore_noirq = pm_generic_restore_noirq,
         .complete = pm_generic_complete,
 #endif
 #ifdef CONFIG_PM_RUNTIME