PCI: rcar-host: Switch to msi_create_parent_irq_domain()

Switch to msi_create_parent_irq_domain() from pci_msi_create_irq_domain()
which was using legacy MSI domain setup.

Signed-off-by: Nam Cao <namcao@linutronix.de>
[mani: reworded commit message]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
[bhelgaas: rebase on dev_fwnode() conversion, drop fwnode local var]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://patch.msgid.link/ab4005db0a829549be1f348f6c27be50a2118b5e.1750858083.git.namcao@linutronix.de

Author: covanam

drivers/pci/controller/Kconfig

@@ -243,6 +243,7 @@ config PCIE_RCAR_HOST
 	bool "Renesas R-Car PCIe controller (host mode)"
 	depends on ARCH_RENESAS || COMPILE_TEST
 	depends on PCI_MSI
+	select IRQ_MSI_LIB
 	help
 	  Say Y here if you want PCIe controller support on R-Car SoCs in host
 	  mode.

drivers/pci/controller/pcie-rcar-host.c

@@ -17,6 +17,7 @@
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
+#include <linux/irqchip/irq-msi-lib.h>
 #include <linux/irqdomain.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
@@ -597,30 +598,6 @@ static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-static void rcar_msi_top_irq_ack(struct irq_data *d)
-{
-	irq_chip_ack_parent(d);
-}
-
-static void rcar_msi_top_irq_mask(struct irq_data *d)
-{
-	pci_msi_mask_irq(d);
-	irq_chip_mask_parent(d);
-}
-
-static void rcar_msi_top_irq_unmask(struct irq_data *d)
-{
-	pci_msi_unmask_irq(d);
-	irq_chip_unmask_parent(d);
-}
-
-static struct irq_chip rcar_msi_top_chip = {
-	.name		= "PCIe MSI",
-	.irq_ack	= rcar_msi_top_irq_ack,
-	.irq_mask	= rcar_msi_top_irq_mask,
-	.irq_unmask	= rcar_msi_top_irq_unmask,
-};
-
 static void rcar_msi_irq_ack(struct irq_data *d)
 {
 	struct rcar_msi *msi = irq_data_get_irq_chip_data(d);
@@ -718,30 +695,36 @@ static const struct irq_domain_ops rcar_msi_domain_ops = {
 	.free	= rcar_msi_domain_free,
 };
 
-static struct msi_domain_info rcar_msi_info = {
-	.flags	= MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
-		  MSI_FLAG_NO_AFFINITY | MSI_FLAG_MULTI_PCI_MSI,
-	.chip	= &rcar_msi_top_chip,
+#define RCAR_MSI_FLAGS_REQUIRED (MSI_FLAG_USE_DEF_DOM_OPS	| \
+				 MSI_FLAG_USE_DEF_CHIP_OPS	| \
+				 MSI_FLAG_PCI_MSI_MASK_PARENT	| \
+				 MSI_FLAG_NO_AFFINITY)
+
+#define RCAR_MSI_FLAGS_SUPPORTED (MSI_GENERIC_FLAGS_MASK	| \
+				  MSI_FLAG_MULTI_PCI_MSI)
+
+static const struct msi_parent_ops rcar_msi_parent_ops = {
+	.required_flags		= RCAR_MSI_FLAGS_REQUIRED,
+	.supported_flags	= RCAR_MSI_FLAGS_SUPPORTED,
+	.bus_select_token	= DOMAIN_BUS_PCI_MSI,
+	.chip_flags		= MSI_CHIP_FLAG_SET_ACK,
+	.prefix			= "RCAR-",
+	.init_dev_msi_info	= msi_lib_init_dev_msi_info,
 };
 
 static int rcar_allocate_domains(struct rcar_msi *msi)
 {
 	struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
-	struct fwnode_handle *fwnode = dev_fwnode(pcie->dev);
-	struct irq_domain *parent;
-
-	parent = irq_domain_create_linear(fwnode, INT_PCI_MSI_NR,
-					  &rcar_msi_domain_ops, msi);
-	if (!parent) {
-		dev_err(pcie->dev, "failed to create IRQ domain\n");
-		return -ENOMEM;
-	}
-	irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS);
-
-	msi->domain = pci_msi_create_irq_domain(fwnode, &rcar_msi_info, parent);
+	struct irq_domain_info info = {
+		.fwnode		= dev_fwnode(pcie->dev),
+		.ops		= &rcar_msi_domain_ops,
+		.host_data	= msi,
+		.size		= INT_PCI_MSI_NR,
+	};
+
+	msi->domain = msi_create_parent_irq_domain(&info, &rcar_msi_parent_ops);
 	if (!msi->domain) {
-		dev_err(pcie->dev, "failed to create MSI domain\n");
-		irq_domain_remove(parent);
+		dev_err(pcie->dev, "failed to create IRQ domain\n");
 		return -ENOMEM;
 	}
 
@@ -750,10 +733,7 @@ static int rcar_allocate_domains(struct rcar_msi *msi)
 
 static void rcar_free_domains(struct rcar_msi *msi)
 {
-	struct irq_domain *parent = msi->domain->parent;
-
 	irq_domain_remove(msi->domain);
-	irq_domain_remove(parent);
 }
 
 static int rcar_pcie_enable_msi(struct rcar_pcie_host *host)