linux-kernel - [PATCH] irq: manage power of chip hierarchy

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Date:   Wed, 19 Jan 2022 17:32:11 +0300
From:   Nikita Yushchenko <nikita.yoush@...entembedded.com>
To:     Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <maz@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>
Subject: [PATCH] irq: manage power of chip hierarchy

In case of hierarchical irq domains, it can be not enough to enable
power of the topmost chip at irq request time. Need to handle entire
chip hierarchy.

This patch updates irq_chip_pm_(get|put) to do so.

Signed-off-by: Nikita Yushchenko <nikita.yoush@...entembedded.com>
---
 kernel/irq/chip.c | 43 +++++++++++++++++++++++++++++++++++++------
 1 file changed, 37 insertions(+), 6 deletions(-)

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index f895265d7548..d1b786f29d30 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -1569,15 +1569,30 @@ int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
  */
 int irq_chip_pm_get(struct irq_data *data)
 {
+#if IS_ENABLED(CONFIG_PM)
+	struct device *dev = data->chip->parent_device;
 	int retval;
 
-	if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device) {
-		retval = pm_runtime_get_sync(data->chip->parent_device);
+#if IS_ENABLED(CONFIG_IRQ_DOMAIN_HIERARCHY)
+	if (data->parent_data) {
+		retval = irq_chip_pm_get(data->parent_data);
+		if (retval < 0)
+			return retval;
+	}
+#endif
+
+	if (dev) {
+		retval = pm_runtime_get_sync(dev);
 		if (retval < 0) {
-			pm_runtime_put_noidle(data->chip->parent_device);
+			pm_runtime_put_noidle(dev);
+#if IS_ENABLED(CONFIG_IRQ_DOMAIN_HIERARCHY)
+			if (data->parent_data)
+				irq_chip_pm_put(data->parent_data);
+#endif
 			return retval;
 		}
 	}
+#endif	/* CONFIG_PM */
 
 	return 0;
 }
@@ -1594,8 +1609,24 @@ int irq_chip_pm_put(struct irq_data *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)
+	do {
+		struct device *dev = data->chip->parent_device;
+		int retval2;
+
+		if (dev) {
+			retval2 = pm_runtime_put(dev);
+			if (retval == 0 && retval2 < 0)
+				retval = retval2;
+		}
+
+#if IS_ENABLED(CONFIG_IRQ_DOMAIN_HIERARCHY)
+		data = data->parent_data;
+#else
+		data = NULL;
+#endif
+	} while (data);
+#endif	/* CONFIG_PM */
 
-	return (retval < 0) ? retval : 0;
+	return retval;
 }
-- 
2.30.2