linux-kernel - [PATCH v11 09/14] irqchip/riscv-imsic: Add support for PCI MSI irqdomain

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Date:   Mon, 23 Oct 2023 22:57:55 +0530
From:   Anup Patel <apatel@...tanamicro.com>
To:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        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:     Marc Zyngier <maz@...nel.org>,
        Björn Töpel <bjorn@...nel.org>,
        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 v11 09/14] 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 | 51 ++++++++++++++++++++++
 drivers/irqchip/irq-riscv-imsic-state.h    |  1 +
 3 files changed, 59 insertions(+)

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index bdd80716114d..c1d69b418dfb 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -552,6 +552,13 @@ 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 23d286cb017e..cdb659401199 100644
--- a/drivers/irqchip/irq-riscv-imsic-platform.c
+++ b/drivers/irqchip/irq-riscv-imsic-platform.c
@@ -13,6 +13,7 @@
 #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>
@@ -215,6 +216,42 @@ static const struct irq_domain_ops imsic_base_domain_ops = {
 #endif
 };
 
+#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,
+#ifdef CONFIG_SMP
+	.irq_set_affinity	= imsic_irq_set_affinity,
+#endif
+	.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",
 #ifdef CONFIG_SMP
@@ -243,6 +280,18 @@ static int imsic_irq_domains_init(struct fwnode_handle *fwnode)
 	}
 	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(fwnode,
+						&imsic_pci_domain_info,
+						imsic->base_domain);
+	if (!imsic->pci_domain) {
+		pr_err("%pfwP: failed to create IMSIC PCI domain\n", fwnode);
+		irq_domain_remove(imsic->base_domain);
+		return -ENOMEM;
+	}
+#endif
+
 	/* Create Platform MSI domain */
 	imsic->plat_domain = platform_msi_create_irq_domain(fwnode,
 						&imsic_plat_domain_info,
@@ -250,6 +299,8 @@ static int imsic_irq_domains_init(struct fwnode_handle *fwnode)
 	if (!imsic->plat_domain) {
 		pr_err("%pfwP: failed to create IMSIC platform domain\n",
 			fwnode);
+		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 82911b8b08b4..8d209e77432e 100644
--- a/drivers/irqchip/irq-riscv-imsic-state.h
+++ b/drivers/irqchip/irq-riscv-imsic-state.h
@@ -67,6 +67,7 @@ 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