linux-kernel - [PATCH v2 10/13] PCI: xgene-msi: Resend an MSI racing with itself on a different CPU

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Message-Id: <20250708173404.1278635-11-maz@kernel.org>
Date: Tue,  8 Jul 2025 18:34:01 +0100
From: Marc Zyngier <maz@...nel.org>
To: linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Toan Le <toan@...amperecomputing.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH v2 10/13] PCI: xgene-msi: Resend an MSI racing with itself on a different CPU

Since changing the affinity of an MSI really is about changing
the target address and that it isn't possible to mask an individual
MSI, it is completely possible for an interrupt to race with itself,
usually resulting in a lost interrupt.

Paper over the design blunder by informing the core code of this
sad state of affair.

Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 drivers/pci/controller/pci-xgene-msi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/pci-xgene-msi.c b/drivers/pci/controller/pci-xgene-msi.c
index b9f364da87f2a..a190c25c8df52 100644
--- a/drivers/pci/controller/pci-xgene-msi.c
+++ b/drivers/pci/controller/pci-xgene-msi.c
@@ -183,6 +183,7 @@ static int xgene_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
 	irq_domain_set_info(domain, virq, hwirq,
 			    &xgene_msi_bottom_irq_chip, domain->host_data,
 			    handle_simple_irq, NULL, NULL);
+	irqd_set_resend_when_in_progress(irq_get_irq_data(virq));
 
 	return 0;
 }
-- 
2.39.2