linux-kernel - [PATCH v12 4/9] irqchip/gic-v3-its: Set IRQ_DOMAIN_FLAG_MSI

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Message-Id: <20241211-ep-msi-v12-4-33d4532fa520@nxp.com>
Date: Wed, 11 Dec 2024 15:57:32 -0500
From: Frank Li <Frank.Li@....com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Thomas Gleixner <tglx@...utronix.de>, Anup Patel <apatel@...tanamicro.com>, 
 Marc Zyngier <maz@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, 
 imx@...ts.linux.dev, Niklas Cassel <cassel@...nel.org>, dlemoal@...nel.org, 
 jdmason@...zu.us, linux-arm-kernel@...ts.infradead.org, 
 Frank Li <Frank.Li@....com>
Subject: [PATCH v12 4/9] irqchip/gic-v3-its: Set
 IRQ_DOMAIN_FLAG_MSI_IMMUTABLE for ITS

Set the IRQ_DOMAIN_FLAG_MSI_IMMUTABLE flag for ITS, as it does not change
the address/data pair after setup.

Ensure compatibility with MSI users, such as PCIe Endpoint Doorbell, which
require the address/data pair to remain unchanged. Enable PCIe endpoints to
use ITS for triggering doorbells from the PCIe Root Complex (RC) side.

Signed-off-by: Frank Li <Frank.Li@....com>
---
change from v11 to v12
- new patch
---
 drivers/irqchip/irq-gic-v3-its.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 92244cfa04647..edaae13bbd3cc 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -5126,7 +5126,7 @@ static int its_init_domain(struct its_node *its)
 	irq_domain_update_bus_token(inner_domain, DOMAIN_BUS_NEXUS);

 	inner_domain->msi_parent_ops = &gic_v3_its_msi_parent_ops;
-	inner_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT;
+	inner_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT | IRQ_DOMAIN_FLAG_MSI_IMMUTABLE;

 	return 0;
 }

-- 
2.34.1