[PATCH v2 0/1] irqchip/mvebu-gicp: clear pending irqs on init

[PATCH v2 0/1] irqchip/mvebu-gicp: clear pending irqs on init

[enachman]

From: Elad Nachman <enachman@marvell.com>

When a kexec'ed kernel boots up, there might be stale unhandled interrupts
pending in the interrupt controller. These are delivered as spurious
interrupts once the boot CPU enables interrupts.
Clear all pending interrupts when the driver is initialized to prevent
these spurious interrupts from locking the CPU in an endless loop.

v2:
  1) rewrap commit message

  2) don't keep remap, unmap register space after clearing pending irqs

  3) fix code styling

Elad Nachman (1):
  irqchip/mvebu-gicp: clear pending irqs on init

 drivers/irqchip/irq-mvebu-gicp.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

-- 
2.25.1

[PATCH v2 1/1] irqchip/mvebu-gicp: clear pending irqs on init

[enachman]

From: Elad Nachman <enachman@marvell.com>

When a kexec'ed kernel boots up, there might be stale unhandled interrupts
pending in the interrupt controller. These are delivered as spurious
interrupts once the boot CPU enables interrupts.
Clear all pending interrupts when the driver is initialized to prevent
these spurious interrupts from locking the CPU in an endless loop.

Signed-off-by: Elad Nachman <enachman@marvell.com>
---
 drivers/irqchip/irq-mvebu-gicp.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/irqchip/irq-mvebu-gicp.c b/drivers/irqchip/irq-mvebu-gicp.c
index d3232d6d8dce..4b2cad09bc71 100644
--- a/drivers/irqchip/irq-mvebu-gicp.c
+++ b/drivers/irqchip/irq-mvebu-gicp.c
@@ -178,6 +178,7 @@ static int mvebu_gicp_probe(struct platform_device *pdev)
 	};
 	struct mvebu_gicp *gicp;
 	int ret, i;
+	void __iomem *base;
 
 	gicp = devm_kzalloc(&pdev->dev, sizeof(*gicp), GFP_KERNEL);
 	if (!gicp)
@@ -236,6 +237,15 @@ static int mvebu_gicp_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
+	base = ioremap(gicp->res->start, gicp->res->end - gicp->res->start);
+	if (IS_ERR(base)) {
+		dev_err(&pdev->dev, "ioremap() failed. Unable to clear pending interrupts.\n");
+	} else {
+		for (i = 0; i < 64; i++)
+			writel(i, base + GICP_CLRSPI_NSR_OFFSET);
+		iounmap(base);
+	}
+
 	return msi_create_parent_irq_domain(&info, &gicp_msi_parent_ops) ? 0 : -ENOMEM;
 }
 
-- 
2.25.1

[tip: irq/urgent] irqchip/mvebu-gicp: Clear pending interrupts on init

[tip-bot2 for Elad Nachman]

The following commit has been merged into the irq/urgent branch of tip:

Commit-ID:     3c3d7dbab2c70a4bca47634d564bf659351c05ca
Gitweb:        https://git.kernel.org/tip/3c3d7dbab2c70a4bca47634d564bf659351c05ca
Author:        Elad Nachman <enachman@marvell.com>
AuthorDate:    Sun, 03 Aug 2025 13:25:48 +03:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Tue, 05 Aug 2025 10:35:03 +02:00

irqchip/mvebu-gicp: Clear pending interrupts on init

When a kexec'ed kernel boots up, there might be stale unhandled interrupts
pending in the interrupt controller. These are delivered as spurious
interrupts once the boot CPU enables interrupts.

Clear all pending interrupts when the driver is initialized to prevent
these spurious interrupts from locking the CPU in an endless loop.

Signed-off-by: Elad Nachman <enachman@marvell.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250803102548.669682-2-enachman@marvell.com
---
 drivers/irqchip/irq-mvebu-gicp.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/irqchip/irq-mvebu-gicp.c b/drivers/irqchip/irq-mvebu-gicp.c
index d3232d6..fd85c84 100644
--- a/drivers/irqchip/irq-mvebu-gicp.c
+++ b/drivers/irqchip/irq-mvebu-gicp.c
@@ -177,6 +177,7 @@ static int mvebu_gicp_probe(struct platform_device *pdev)
 		.ops	= &gicp_domain_ops,
 	};
 	struct mvebu_gicp *gicp;
+	void __iomem *base;
 	int ret, i;
 
 	gicp = devm_kzalloc(&pdev->dev, sizeof(*gicp), GFP_KERNEL);
@@ -236,6 +237,15 @@ static int mvebu_gicp_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
+	base = ioremap(gicp->res->start, gicp->res->end - gicp->res->start);
+	if (IS_ERR(base)) {
+		dev_err(&pdev->dev, "ioremap() failed. Unable to clear pending interrupts.\n");
+	} else {
+		for (i = 0; i < 64; i++)
+			writel(i, base + GICP_CLRSPI_NSR_OFFSET);
+		iounmap(base);
+	}
+
 	return msi_create_parent_irq_domain(&info, &gicp_msi_parent_ops) ? 0 : -ENOMEM;
 }
 

Re: [PATCH v2 0/1] irqchip/mvebu-gicp: clear pending irqs on init

[Markus Elfring]

…
> v2:
>   1) rewrap commit message
…

You may omit a cover letter for a single patch,
don't you?
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.16#n784

Regards,
Markus