iommu/amd: Enable PCI/IMS

PCI/IMS works like PCI/MSI-X in the remapping. Just add the feature flag,
but only when on real hardware.

Virtualized IOMMUs need additional support.

Signed-off-by: Thomas Gleixner <[e-mail]>
Reviewed-by: Kevin Tian <[e-mail]>
Acked-by: Marc Zyngier <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/iommu/amd/iommu.c

···
 };
 
 static const struct msi_parent_ops amdvi_msi_parent_ops = {
-	.supported_flags	= X86_VECTOR_MSI_FLAGS_SUPPORTED | MSI_FLAG_MULTI_PCI_MSI,
+	.supported_flags	= X86_VECTOR_MSI_FLAGS_SUPPORTED |
+				  MSI_FLAG_MULTI_PCI_MSI |
+				  MSI_FLAG_PCI_IMS,
 	.prefix			= "IR-",
+	.init_dev_msi_info	= msi_parent_init_dev_msi_info,
+};
+
+static const struct msi_parent_ops virt_amdvi_msi_parent_ops = {
+	.supported_flags	= X86_VECTOR_MSI_FLAGS_SUPPORTED |
+				  MSI_FLAG_MULTI_PCI_MSI,
+	.prefix			= "vIR-",
 	.init_dev_msi_info	= msi_parent_init_dev_msi_info,
 };
 
···
 
 	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;
+
+	if (amd_iommu_np_cache)
+		iommu->ir_domain->msi_parent_ops = &virt_amdvi_msi_parent_ops;
+	else
+		iommu->ir_domain->msi_parent_ops = &amdvi_msi_parent_ops;
 
 	return 0;
 }