+
+#ifdef CONFIG_ACPI
+static int acpi_num_msi;
+
+static struct fwnode_handle *gicv2m_get_fwnode(struct device *dev)
+{
+ struct v2m_data *data;
+
+ if (WARN_ON(acpi_num_msi <= 0))
+ return NULL;
+
+ /* We only return the fwnode of the first MSI frame. */
+ data = list_first_entry_or_null(&v2m_nodes, struct v2m_data, entry);
+ if (!data)
+ return NULL;
+
+ return data->fwnode;
+}
+
+static int __init
+acpi_parse_madt_msi(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ int ret;
+ struct resource res;
+ u32 spi_start = 0, nr_spis = 0;
+ struct acpi_madt_generic_msi_frame *m;
+ struct fwnode_handle *fwnode;
+
+ m = (struct acpi_madt_generic_msi_frame *)header;
+ if (BAD_MADT_ENTRY(m, end))
+ return -EINVAL;
+
+ res.start = m->base_address;
+ res.end = m->base_address + SZ_4K;
+
+ if (m->flags & ACPI_MADT_OVERRIDE_SPI_VALUES) {
+ spi_start = m->spi_base;
+ nr_spis = m->spi_count;
+
+ pr_info("ACPI overriding V2M MSI_TYPER (base:%u, num:%u)\n",
+ spi_start, nr_spis);
+ }
+
+ fwnode = irq_domain_alloc_fwnode((void *)m->base_address);
+ if (!fwnode) {
+ pr_err("Unable to allocate GICv2m domain token\n");
+ return -EINVAL;
+ }
+
+ ret = gicv2m_init_one(fwnode, spi_start, nr_spis, &res);
+ if (ret)
+ irq_domain_free_fwnode(fwnode);
+
+ return ret;
+}
+
+static int __init gicv2m_acpi_init(struct irq_domain *parent)
+{
+ int ret;
+
+ if (acpi_num_msi > 0)
+ return 0;
+
+ acpi_num_msi = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_MSI_FRAME,
+ acpi_parse_madt_msi, 0);
+
+ if (acpi_num_msi <= 0)
+ goto err_out;
+
+ ret = gicv2m_allocate_domains(parent);
+ if (ret)
+ goto err_out;
+
+ pci_msi_register_fwnode_provider(&gicv2m_get_fwnode);
+
+ return 0;
+
+err_out:
+ gicv2m_teardown();
+ return -EINVAL;
+}
+#else /* CONFIG_ACPI */
+static int __init gicv2m_acpi_init(struct irq_domain *parent)
+{
+ return -EINVAL;
+}
+#endif /* CONFIG_ACPI */
+
+int __init gicv2m_init(struct fwnode_handle *parent_handle,
+ struct irq_domain *parent)
+{
+ if (is_of_node(parent_handle))
+ return gicv2m_of_init(parent_handle, parent);
+
+ return gicv2m_acpi_init(parent);
+}