irqchip/loongson-pch-msi: Switch to MSI parent domains

Remove the global PCI/MSI irqdomain implementation and provide the
required MSI parent functionality by filling in msi_parent_ops, so the
PCI/MSI code can detect the new parent and setup per-device MSI domains.

Signed-off-by: Huacai Chen <[e-mail]>
Signed-off-by: Tianyang Zhang <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Link: https://lore.kernel.org/all/[e-mail]

drivers/irqchip/Kconfig

···
 	depends on PCI
 	default MACH_LOONGSON64
 	select IRQ_DOMAIN_HIERARCHY
+	select IRQ_MSI_LIB
 	select PCI_MSI
 	help
 	  Support for the Loongson PCH MSI Controller.

drivers/irqchip/irq-loongson-pch-msi.c

···
 #include <linux/pci.h>
 #include <linux/slab.h>
 
+#include "irq-msi-lib.h"
+
 static int nr_pics;
 
 struct pch_msi_data {
···
 };
 
 static struct fwnode_handle *pch_msi_handle[MAX_IO_PICS];
-
-static void pch_msi_mask_msi_irq(struct irq_data *d)
-{
-	pci_msi_mask_irq(d);
-	irq_chip_mask_parent(d);
-}
-
-static void pch_msi_unmask_msi_irq(struct irq_data *d)
-{
-	irq_chip_unmask_parent(d);
-	pci_msi_unmask_irq(d);
-}
-
-static struct irq_chip pch_msi_irq_chip = {
-	.name			= "PCH PCI MSI",
-	.irq_mask		= pch_msi_mask_msi_irq,
-	.irq_unmask		= pch_msi_unmask_msi_irq,
-	.irq_ack		= irq_chip_ack_parent,
-	.irq_set_affinity	= irq_chip_set_affinity_parent,
-};
 
 static int pch_msi_allocate_hwirq(struct pch_msi_data *priv, int num_req)
 {
···
 	msg->address_lo = lower_32_bits(priv->doorbell);
 	msg->data = data->hwirq;
 }
-
-static struct msi_domain_info pch_msi_domain_info = {
-	.flags	= MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
-		  MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX,
-	.chip	= &pch_msi_irq_chip,
-};
 
 static struct irq_chip middle_irq_chip = {
 	.name			= "PCH MSI",
···
 static const struct irq_domain_ops pch_msi_middle_domain_ops = {
 	.alloc	= pch_msi_middle_domain_alloc,
 	.free	= pch_msi_middle_domain_free,
+	.select	= msi_lib_irq_domain_select,
+};
+
+#define PCH_MSI_FLAGS_REQUIRED  (MSI_FLAG_USE_DEF_DOM_OPS |	\
+				 MSI_FLAG_USE_DEF_CHIP_OPS |	\
+				 MSI_FLAG_PCI_MSI_MASK_PARENT)
+
+#define PCH_MSI_FLAGS_SUPPORTED (MSI_GENERIC_FLAGS_MASK |	\
+				 MSI_FLAG_PCI_MSIX      |	\
+				 MSI_FLAG_MULTI_PCI_MSI)
+
+static struct msi_parent_ops pch_msi_parent_ops = {
+	.required_flags		= PCH_MSI_FLAGS_REQUIRED,
+	.supported_flags	= PCH_MSI_FLAGS_SUPPORTED,
+	.bus_select_mask	= MATCH_PCI_MSI,
+	.bus_select_token	= DOMAIN_BUS_NEXUS,
+	.prefix			= "PCH-",
+	.init_dev_msi_info	= msi_lib_init_dev_msi_info,
 };
 
 static int pch_msi_init_domains(struct pch_msi_data *priv,
 				struct irq_domain *parent,
 				struct fwnode_handle *domain_handle)
 {
-	struct irq_domain *middle_domain, *msi_domain;
+	struct irq_domain *middle_domain;
 
 	middle_domain = irq_domain_create_hierarchy(parent, 0, priv->num_irqs,
 						    domain_handle,
···
 
 	irq_domain_update_bus_token(middle_domain, DOMAIN_BUS_NEXUS);
 
-	msi_domain = pci_msi_create_irq_domain(domain_handle,
-					       &pch_msi_domain_info,
-					       middle_domain);
-	if (!msi_domain) {
-		pr_err("Failed to create PCI MSI domain\n");
-		irq_domain_remove(middle_domain);
-		return -ENOMEM;
-	}
+	middle_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT;
+	middle_domain->msi_parent_ops = &pch_msi_parent_ops;
 
 	return 0;
 }