[PATCH v2 6/6] drivers/pci/hyperv/arm64: vPCI MSI IRQ domain from DT

[Roman Kisel <romank@linux.microsoft.com>]

The hyperv-pci driver uses ACPI for MSI IRQ domain configuration
on arm64 thereby it won't be able to do that in the VTL mode where
only DeviceTree can be used.

Update the hyperv-pci driver to discover interrupt configuration
via DeviceTree.

Signed-off-by: Roman Kisel <romank@linux.microsoft.com>
---
 drivers/pci/controller/pci-hyperv.c | 13 ++++++++++---
 include/linux/acpi.h                |  9 +++++++++
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index 1eaffff40b8d..ccc2b54206f4 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -906,9 +906,16 @@ static int hv_pci_irqchip_init(void)
 	 * way to ensure that all the corresponding devices are also gone and
 	 * no interrupts will be generated.
 	 */
-	hv_msi_gic_irq_domain = acpi_irq_create_hierarchy(0, HV_PCI_MSI_SPI_NR,
-							  fn, &hv_pci_domain_ops,
-							  chip_data);
+	if (acpi_disabled)
+		hv_msi_gic_irq_domain = irq_domain_create_hierarchy(
+			irq_find_matching_fwnode(fn, DOMAIN_BUS_ANY),
+			0, HV_PCI_MSI_SPI_NR,
+			fn, &hv_pci_domain_ops,
+			chip_data);
+	else
+		hv_msi_gic_irq_domain = acpi_irq_create_hierarchy(0, HV_PCI_MSI_SPI_NR,
+			fn, &hv_pci_domain_ops,
+			chip_data);
 
 	if (!hv_msi_gic_irq_domain) {
 		pr_err("Failed to create Hyper-V arm64 vPCI MSI IRQ domain\n");
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index b7165e52b3c6..498cbb2c40a1 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1077,6 +1077,15 @@ static inline bool acpi_sleep_state_supported(u8 sleep_state)
 	return false;
 }
 
+static inline struct irq_domain *acpi_irq_create_hierarchy(unsigned int flags,
+					     unsigned int size,
+					     struct fwnode_handle *fwnode,
+					     const struct irq_domain_ops *ops,
+					     void *host_data)
+{
+	return NULL;
+}
+
 #endif	/* !CONFIG_ACPI */
 
 extern void arch_post_acpi_subsys_init(void);
-- 
2.45.0