[v3,7/7] PCI: hv: Get vPCI MSI IRQ domain from DT

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 7eee7caff5f6..038bd9be64b7 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -45,7 +45,8 @@  struct vmbus_dynid {
 	struct hv_vmbus_device_id id;
 };
 
-static struct device  *hv_dev;
+/* VMBus Root Device */
+static struct device  *vmbus_root_device;
 
 static int hyperv_cpuhp_online;
 
@@ -80,9 +81,15 @@  static struct resource *fb_mmio;
 static struct resource *hyperv_mmio;
 static DEFINE_MUTEX(hyperv_mmio_lock);
 
+struct device *get_vmbus_root_device(void)
+{
+	return vmbus_root_device;
+}
+EXPORT_SYMBOL_GPL(get_vmbus_root_device);
+
 static int vmbus_exists(void)
 {
-	if (hv_dev == NULL)
+	if (vmbus_root_device == NULL)
 		return -ENODEV;
 
 	return 0;
@@ -861,7 +868,7 @@  static int vmbus_dma_configure(struct device *child_device)
 	 * On x86/x64 coherence is assumed and these calls have no effect.
 	 */
 	hv_setup_dma_ops(child_device,
-		device_get_dma_attr(hv_dev) == DEV_DMA_COHERENT);
+		device_get_dma_attr(vmbus_root_device) == DEV_DMA_COHERENT);
 	return 0;
 }
 
@@ -1892,7 +1899,7 @@  int vmbus_device_register(struct hv_device *child_device_obj)
 		     &child_device_obj->channel->offermsg.offer.if_instance);
 
 	child_device_obj->device.bus = &hv_bus;
-	child_device_obj->device.parent = hv_dev;
+	child_device_obj->device.parent = vmbus_root_device;
 	child_device_obj->device.release = vmbus_device_release;
 
 	child_device_obj->device.dma_parms = &child_device_obj->dma_parms;
@@ -2253,7 +2260,7 @@  static int vmbus_acpi_add(struct platform_device *pdev)
 	struct acpi_device *ancestor;
 	struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
 
-	hv_dev = &device->dev;
+	vmbus_root_device = &device->dev;
 
 	/*
 	 * Older versions of Hyper-V for ARM64 fail to include the _CCA
@@ -2342,7 +2349,7 @@  static int vmbus_device_add(struct platform_device *pdev)
 	struct device_node *np = pdev->dev.of_node;
 	int ret;
 
-	hv_dev = &pdev->dev;
+	vmbus_root_device = &pdev->dev;
 
 	ret = of_range_parser_init(&parser, np);
 	if (ret)
@@ -2675,7 +2682,7 @@  static int __init hv_acpi_init(void)
 	if (ret)
 		return ret;
 
-	if (!hv_dev) {
+	if (!vmbus_root_device) {
 		ret = -ENODEV;
 		goto cleanup;
 	}
@@ -2706,7 +2713,7 @@  static int __init hv_acpi_init(void)
 
 cleanup:
 	platform_driver_unregister(&vmbus_platform_driver);
-	hv_dev = NULL;
+	vmbus_root_device = NULL;
 	return ret;
 }
 
diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index 5992280e8110..cdecefd1f9bd 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -50,6 +50,7 @@ 
 #include <linux/irqdomain.h>
 #include <linux/acpi.h>
 #include <linux/sizes.h>
+#include <linux/of_irq.h>
 #include <asm/mshyperv.h>
 
 /*
@@ -887,6 +888,35 @@  static const struct irq_domain_ops hv_pci_domain_ops = {
 	.activate = hv_pci_vec_irq_domain_activate,
 };
 
+#ifdef CONFIG_OF
+
+static struct irq_domain *hv_pci_of_irq_domain_parent(void)
+{
+	struct device_node *parent;
+	struct irq_domain *domain;
+
+	parent = of_irq_find_parent(to_platform_device(get_vmbus_root_device())->dev.of_node);
+	domain = NULL;
+	if (parent) {
+		domain = irq_find_host(parent);
+		of_node_put(parent);
+	}
+
+	/*
+	 * `domain == NULL` shouldn't happen.
+	 *
+	 * If somehow the code does end up in that state, treat this as a configuration
+	 * issue rather than a hard error, emit a warning, and let the code proceed.
+	 * The NULL parent domain is an acceptable option for the `irq_domain_create_hierarchy`
+	 * function called later.
+	 */
+	if (!domain)
+		WARN_ONCE(1, "No interrupt-parent found, check the DeviceTree data.\n");
+	return domain;
+}
+
+#endif
+
 static int hv_pci_irqchip_init(void)
 {
 	static struct hv_pci_chip_data *chip_data;
@@ -906,10 +936,29 @@  static int hv_pci_irqchip_init(void)
 	 * IRQ domain once enabled, should not be removed since there is no
 	 * way to ensure that all the corresponding devices are also gone and
 	 * no interrupts will be generated.
+	 *
+	 * In the ACPI case, the parent IRQ domain is supplied by the ACPI
+	 * subsystem, and it is the default GSI domain pointing to the GIC.
+	 * Neither is available outside of the ACPI subsystem, cannot avoid
+	 * the messy ifdef below.
+	 * There is apparently no such default in the OF subsystem, and
+	 * `hv_pci_of_irq_domain_parent` finds the parent IRQ domain that
+	 * points to the GIC as well.
+	 * None of these two cases reaches for the MSI parent domain.
 	 */
-	hv_msi_gic_irq_domain = acpi_irq_create_hierarchy(0, HV_PCI_MSI_SPI_NR,
-							  fn, &hv_pci_domain_ops,
-							  chip_data);
+#ifdef CONFIG_ACPI
+	if (!acpi_disabled)
+		hv_msi_gic_irq_domain = acpi_irq_create_hierarchy(0, HV_PCI_MSI_SPI_NR,
+			fn, &hv_pci_domain_ops,
+			chip_data);
+#endif
+#if defined(CONFIG_OF)
+	if (!hv_msi_gic_irq_domain)
+		hv_msi_gic_irq_domain = irq_domain_create_hierarchy(
+			hv_pci_of_irq_domain_parent(), 0, HV_PCI_MSI_SPI_NR,
+			fn, &hv_pci_domain_ops,
+			chip_data);
+#endif
 
 	if (!hv_msi_gic_irq_domain) {
 		pr_err("Failed to create Hyper-V arm64 vPCI MSI IRQ domain\n");
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 5e39baa7f6cb..b4aa1f579a97 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1346,6 +1346,8 @@  static inline void *hv_get_drvdata(struct hv_device *dev)
 	return dev_get_drvdata(&dev->device);
 }
 
+struct device *get_vmbus_root_device(void);
+
 struct hv_ring_buffer_debug_info {
 	u32 current_interrupt_mask;
 	u32 current_read_index;