linux-kernel - [RFC PATCH 03/15] irqchip/riscv-imsic: Add support for DOMAIN_BUS_MSI

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Message-ID: <20241114161845.502027-20-ajones@ventanamicro.com>
Date: Thu, 14 Nov 2024 17:18:48 +0100
From: Andrew Jones <ajones@...tanamicro.com>
To: iommu@...ts.linux.dev,
	kvm-riscv@...ts.infradead.org,
	kvm@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: tjeznach@...osinc.com,
	zong.li@...ive.com,
	joro@...tes.org,
	will@...nel.org,
	robin.murphy@....com,
	anup@...infault.org,
	atishp@...shpatra.org,
	tglx@...utronix.de,
	alex.williamson@...hat.com,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu
Subject: [RFC PATCH 03/15] irqchip/riscv-imsic: Add support for DOMAIN_BUS_MSI_REMAP

Unlike a child of an MSI NEXUS domain, a child of an MSI_REMAP domain
will not invoke init_dev_msi_info() with 'domain' equal to
'msi_parent_domain'. This is because the MSI_REMAP domain implements
init_dev_msi_info() with msi_parent_init_dev_msi_info(), which makes
'domain' point to the NEXUS (IMSIC) domain, while keeping
'msi_parent_domain' pointing to itself. The rest of the IMSIC
init_dev_msi_info() implementation works for MSI_REMAP domains,
though, so there's nothing to do to add support except accept the
token.

Signed-off-by: Andrew Jones <ajones@...tanamicro.com>
---
 drivers/irqchip/irq-riscv-imsic-platform.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/irqchip/irq-riscv-imsic-platform.c b/drivers/irqchip/irq-riscv-imsic-platform.c
index 5d7c30ad8855..6a7d7fefda6a 100644
--- a/drivers/irqchip/irq-riscv-imsic-platform.c
+++ b/drivers/irqchip/irq-riscv-imsic-platform.c
@@ -246,6 +246,8 @@ static bool imsic_init_dev_msi_info(struct device *dev,
 	case DOMAIN_BUS_NEXUS:
 		if (WARN_ON_ONCE(domain != real_parent))
 			return false;
+		fallthrough;
+	case DOMAIN_BUS_MSI_REMAP:
 #ifdef CONFIG_SMP
 		info->chip->irq_set_affinity = irq_chip_set_affinity_parent;
 #endif
-- 
2.47.0