Patch "genirq: Allow the PM device to originate from irq domain" has been added to the 5.10-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    genirq: Allow the PM device to originate from irq domain

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     genirq-allow-the-pm-device-to-originate-from-irq-dom.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 6082826257da6d7c5217f69a4c34521feed6379a
Author: Marc Zyngier <maz@xxxxxxxxxx>
Date:   Tue Feb 1 12:02:59 2022 +0000

    genirq: Allow the PM device to originate from irq domain
    
    [ Upstream commit 1f8863bfb5ca500ea1c7669b16b1931ba27fce20 ]
    
    As a preparation to moving the reference to the device used for
    runtime power management, add a new 'dev' field to the irqdomain
    structure for that exact purpose.
    
    The irq_chip_pm_{get,put}() helpers are made aware of the dual
    location via a new private helper.
    
    No functional change intended.
    
    Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
    Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
    Tested-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
    Tested-by: Tony Lindgren <tony@xxxxxxxxxxx>
    Acked-by: Bartosz Golaszewski <brgl@xxxxxxxx>
    Link: https://lore.kernel.org/r/20220201120310.878267-2-maz@xxxxxxxxxx
    Stable-dep-of: 33b1c47d1fc0 ("irqchip/imx-irqsteer: Handle runtime power management correctly")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 9b9743f7538c4..60f53eadfa422 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -149,6 +149,8 @@ struct irq_domain_chip_generic;
  * @gc: Pointer to a list of generic chips. There is a helper function for
  *      setting up one or more generic chips for interrupt controllers
  *      drivers using the generic chip library which uses this pointer.
+ * @dev: Pointer to a device that the domain represent, and that will be
+ *       used for power management purposes.
  * @parent: Pointer to parent irq_domain to support hierarchy irq_domains
  * @debugfs_file: dentry for the domain debugfs file
  *
@@ -171,6 +173,7 @@ struct irq_domain {
 	struct fwnode_handle *fwnode;
 	enum irq_domain_bus_token bus_token;
 	struct irq_domain_chip_generic *gc;
+	struct device *dev;
 #ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
 	struct irq_domain *parent;
 #endif
@@ -227,6 +230,13 @@ static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d)
 	return to_of_node(d->fwnode);
 }
 
+static inline void irq_domain_set_pm_device(struct irq_domain *d,
+					    struct device *dev)
+{
+	if (d)
+		d->dev = dev;
+}
+
 #ifdef CONFIG_IRQ_DOMAIN
 struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
 						const char *name, phys_addr_t *pa);
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index e7d284261d450..b8aa9e22105f9 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -1586,6 +1586,17 @@ int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
 	return 0;
 }
 
+static struct device *irq_get_parent_device(struct irq_data *data)
+{
+	if (data->chip->parent_device)
+		return data->chip->parent_device;
+
+	if (data->domain)
+		return data->domain->dev;
+
+	return NULL;
+}
+
 /**
  * irq_chip_pm_get - Enable power for an IRQ chip
  * @data:	Pointer to interrupt specific data
@@ -1595,12 +1606,13 @@ int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
  */
 int irq_chip_pm_get(struct irq_data *data)
 {
+	struct device *dev = irq_get_parent_device(data);
 	int retval;
 
-	if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device) {
-		retval = pm_runtime_get_sync(data->chip->parent_device);
+	if (IS_ENABLED(CONFIG_PM) && dev) {
+		retval = pm_runtime_get_sync(dev);
 		if (retval < 0) {
-			pm_runtime_put_noidle(data->chip->parent_device);
+			pm_runtime_put_noidle(dev);
 			return retval;
 		}
 	}
@@ -1618,10 +1630,11 @@ int irq_chip_pm_get(struct irq_data *data)
  */
 int irq_chip_pm_put(struct irq_data *data)
 {
+	struct device *dev = irq_get_parent_device(data);
 	int retval = 0;
 
-	if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device)
-		retval = pm_runtime_put(data->chip->parent_device);
+	if (IS_ENABLED(CONFIG_PM) && dev)
+		retval = pm_runtime_put(dev);
 
 	return (retval < 0) ? retval : 0;
 }