From c9b4f313f6b83ac80e9d51845d092c32513efdb4 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <maz@kernel.org>
Date: Thu, 18 Jul 2024 08:58:04 +0100
Subject: [PATCH] irqchip/gic-v3-its: Correctly fish out the DID for platform
MSI
Similarly to PCI where msi-map/msi-mask are used to compute the full RID
(aka DID in ITS speak), use the msi-parent as the discovery mechanism,
since there is no way a device can generally express its ID.
However, since switching to a per-device MSI domain model, the domain
passed to its_pmsi_prepare() is the wrong one, and points to the device's
instead of the ITS'. Bad.
Use the parent domain instead, which is the ITS domain.
Fixes: 80b63cc1cc146 ("irqchip/gic-v3-its: Switch platform MSI to MSI parent")
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240718075804.2245733-1-maz@kernel.org
---
drivers/irqchip/irq-gic-v3-its-msi-parent.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/irqchip/irq-gic-v3-its-msi-parent.c b/drivers/irqchip/irq-gic-v3-its-msi-parent.c
index 2f3fc597331ba..e150365fbe892 100644
--- a/drivers/irqchip/irq-gic-v3-its-msi-parent.c
+++ b/drivers/irqchip/irq-gic-v3-its-msi-parent.c
@@ -134,7 +134,7 @@ static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
int ret;
if (dev->of_node)
- ret = of_pmsi_get_dev_id(domain, dev, &dev_id);
+ ret = of_pmsi_get_dev_id(domain->parent, dev, &dev_id);
else
ret = iort_pmsi_get_dev_id(dev, &dev_id);
if (ret)
--
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