linux-kernel - [PATCH v7 10/15] irqchip/riscv-imsic: Add support for PCI MSI irqdomain

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Date:   Wed,  2 Aug 2023 20:30:13 +0530
From:   Anup Patel <apatel@...tanamicro.com>
To:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Frank Rowand <frowand.list@...il.com>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     Atish Patra <atishp@...shpatra.org>,
        Andrew Jones <ajones@...tanamicro.com>,
        Sunil V L <sunilvl@...tanamicro.com>,
        Saravana Kannan <saravanak@...gle.com>,
        Anup Patel <anup@...infault.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Anup Patel <apatel@...tanamicro.com>
Subject: [PATCH v7 10/15] irqchip/riscv-imsic: Add support for PCI MSI irqdomain

The Linux PCI framework requires it's own dedicated MSI irqdomain so
let us create PCI MSI irqdomain as child of the IMSIC base irqdomain.

Signed-off-by: Anup Patel <apatel@...tanamicro.com>
---
 drivers/irqchip/Kconfig                    |  7 ++++
 drivers/irqchip/irq-riscv-imsic-platform.c | 48 ++++++++++++++++++++++
 drivers/irqchip/irq-riscv-imsic-state.h    |  1 +
 3 files changed, 56 insertions(+)

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 8ef18be5f37b..d700980372ef 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -550,6 +550,13 @@ config RISCV_IMSIC
 	select IRQ_DOMAIN_HIERARCHY
 	select GENERIC_MSI_IRQ
 
+config RISCV_IMSIC_PCI
+	bool
+	depends on RISCV_IMSIC
+	depends on PCI
+	depends on PCI_MSI
+	default RISCV_IMSIC
+
 config EXYNOS_IRQ_COMBINER
 	bool "Samsung Exynos IRQ combiner support" if COMPILE_TEST
 	depends on (ARCH_EXYNOS && ARM) || COMPILE_TEST
diff --git a/drivers/irqchip/irq-riscv-imsic-platform.c b/drivers/irqchip/irq-riscv-imsic-platform.c
index b78f1b2ee3dc..ff737b4e195f 100644
--- a/drivers/irqchip/irq-riscv-imsic-platform.c
+++ b/drivers/irqchip/irq-riscv-imsic-platform.c
@@ -12,6 +12,7 @@
 #include <linux/irqdomain.h>
 #include <linux/module.h>
 #include <linux/msi.h>
+#include <linux/pci.h>
 #include <linux/platform_device.h>
 #include <linux/spinlock.h>
 #include <linux/smp.h>
@@ -184,6 +185,39 @@ static const struct irq_domain_ops imsic_base_domain_ops = {
 	.free		= imsic_irq_domain_free,
 };
 
+#ifdef CONFIG_RISCV_IMSIC_PCI
+
+static void imsic_pci_mask_irq(struct irq_data *d)
+{
+	pci_msi_mask_irq(d);
+	irq_chip_mask_parent(d);
+}
+
+static void imsic_pci_unmask_irq(struct irq_data *d)
+{
+	pci_msi_unmask_irq(d);
+	irq_chip_unmask_parent(d);
+}
+
+static struct irq_chip imsic_pci_irq_chip = {
+	.name			= "IMSIC-PCI",
+	.irq_mask		= imsic_pci_mask_irq,
+	.irq_unmask		= imsic_pci_unmask_irq,
+	.irq_eoi		= irq_chip_eoi_parent,
+};
+
+static struct msi_domain_ops imsic_pci_domain_ops = {
+};
+
+static struct msi_domain_info imsic_pci_domain_info = {
+	.flags	= (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+		   MSI_FLAG_PCI_MSIX | MSI_FLAG_MULTI_PCI_MSI),
+	.ops	= &imsic_pci_domain_ops,
+	.chip	= &imsic_pci_irq_chip,
+};
+
+#endif
+
 static struct irq_chip imsic_plat_irq_chip = {
 	.name			= "IMSIC-PLAT",
 };
@@ -208,12 +242,26 @@ static int imsic_irq_domains_init(struct device *dev)
 	}
 	irq_domain_update_bus_token(imsic->base_domain, DOMAIN_BUS_NEXUS);
 
+#ifdef CONFIG_RISCV_IMSIC_PCI
+	/* Create PCI MSI domain */
+	imsic->pci_domain = pci_msi_create_irq_domain(dev->fwnode,
+						&imsic_pci_domain_info,
+						imsic->base_domain);
+	if (!imsic->pci_domain) {
+		dev_err(dev, "failed to create IMSIC PCI domain\n");
+		irq_domain_remove(imsic->base_domain);
+		return -ENOMEM;
+	}
+#endif
+
 	/* Create Platform MSI domain */
 	imsic->plat_domain = platform_msi_create_irq_domain(dev->fwnode,
 						&imsic_plat_domain_info,
 						imsic->base_domain);
 	if (!imsic->plat_domain) {
 		dev_err(dev, "failed to create IMSIC platform domain\n");
+		if (imsic->pci_domain)
+			irq_domain_remove(imsic->pci_domain);
 		irq_domain_remove(imsic->base_domain);
 		return -ENOMEM;
 	}
diff --git a/drivers/irqchip/irq-riscv-imsic-state.h b/drivers/irqchip/irq-riscv-imsic-state.h
index 3170018949a8..ff3c377b9b33 100644
--- a/drivers/irqchip/irq-riscv-imsic-state.h
+++ b/drivers/irqchip/irq-riscv-imsic-state.h
@@ -31,6 +31,7 @@ struct imsic_priv {
 
 	/* IRQ domains (created by platform driver) */
 	struct irq_domain *base_domain;
+	struct irq_domain *pci_domain;
 	struct irq_domain *plat_domain;
 };
 
-- 
2.34.1