iommu/amd: Switch to MSI base domains

Remove the global PCI/MSI irqdomain implementation and provide the required
MSI parent ops so the PCI/MSI code can detect the new parent and setup per
device domains.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221124232326.209212272@linutronix.de

arch/x86/kernel/apic/msi.c

@@ -218,6 +218,7 @@ static bool x86_init_dev_msi_info(struct device *dev, struct irq_domain *domain,
 		info->flags |= MSI_FLAG_NOMASK_QUIRK;
 		break;
 	case DOMAIN_BUS_DMAR:
+	case DOMAIN_BUS_AMDVI:
 		break;
 	default:
 		WARN_ON_ONCE(1);

drivers/iommu/amd/amd_iommu_types.h

@@ -734,7 +734,6 @@ struct amd_iommu {
 	u8 max_counters;
 #ifdef CONFIG_IRQ_REMAP
 	struct irq_domain *ir_domain;
-	struct irq_domain *msi_domain;
 
 	struct amd_irte_ops *irte_ops;
 #endif

drivers/iommu/amd/iommu.c

@@ -815,7 +815,7 @@ amd_iommu_set_pci_msi_domain(struct device *dev, struct amd_iommu *iommu)
 	    !pci_dev_has_default_msi_parent_domain(to_pci_dev(dev)))
 		return;
 
-	dev_set_msi_domain(dev, iommu->msi_domain);
+	dev_set_msi_domain(dev, iommu->ir_domain);
 }
 
 #else /* CONFIG_IRQ_REMAP */
@@ -3648,6 +3648,12 @@ static struct irq_chip amd_ir_chip = {
 	.irq_compose_msi_msg	= ir_compose_msi_msg,
 };
 
+static const struct msi_parent_ops amdvi_msi_parent_ops = {
+	.supported_flags	= X86_VECTOR_MSI_FLAGS_SUPPORTED | MSI_FLAG_MULTI_PCI_MSI,
+	.prefix			= "IR-",
+	.init_dev_msi_info	= msi_parent_init_dev_msi_info,
+};
+
 int amd_iommu_create_irq_domain(struct amd_iommu *iommu)
 {
 	struct fwnode_handle *fn;
@@ -3655,16 +3661,17 @@ int amd_iommu_create_irq_domain(struct amd_iommu *iommu)
 	fn = irq_domain_alloc_named_id_fwnode("AMD-IR", iommu->index);
 	if (!fn)
 		return -ENOMEM;
-	iommu->ir_domain = irq_domain_create_tree(fn, &amd_ir_domain_ops, iommu);
+	iommu->ir_domain = irq_domain_create_hierarchy(arch_get_ir_parent_domain(), 0, 0,
+						       fn, &amd_ir_domain_ops, iommu);
 	if (!iommu->ir_domain) {
 		irq_domain_free_fwnode(fn);
 		return -ENOMEM;
 	}
 
-	iommu->ir_domain->parent = arch_get_ir_parent_domain();
-	iommu->msi_domain = arch_create_remap_msi_irq_domain(iommu->ir_domain,
-							     "AMD-IR-MSI",
-							     iommu->index);
+	irq_domain_update_bus_token(iommu->ir_domain,  DOMAIN_BUS_AMDVI);
+	iommu->ir_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT;
+	iommu->ir_domain->msi_parent_ops = &amdvi_msi_parent_ops;
+
 	return 0;
 }
 

include/linux/irqdomain_defs.h

@@ -24,6 +24,7 @@ enum irq_domain_bus_token {
 	DOMAIN_BUS_PCI_DEVICE_MSI,
 	DOMAIN_BUS_PCI_DEVICE_MSIX,
 	DOMAIN_BUS_DMAR,
+	DOMAIN_BUS_AMDVI,
 };
 
 #endif /* _LINUX_IRQDOMAIN_DEFS_H */