1 files changed, 142 insertions, 23 deletions

diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
index 87f8d104acab..c779f83e511d 100644
--- a/drivers/irqchip/irq-gic-v2m.c
+++ b/drivers/irqchip/irq-gic-v2m.c
@@ -15,9 +15,11 @@
 
 #define pr_fmt(fmt) "GICv2m: " fmt
 
+#include <linux/acpi.h>
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
 #include <linux/kernel.h>
+#include <linux/msi.h>
 #include <linux/of_address.h>
 #include <linux/of_pci.h>
 #include <linux/slab.h>
@@ -55,7 +57,7 @@ static DEFINE_SPINLOCK(v2m_lock);
 
 struct v2m_data {
 	struct list_head entry;
-	struct device_node *node;
+	struct fwnode_handle *fwnode;
 	struct resource res;	/* GICv2m resource */
 	void __iomem *base;	/* GICv2m virt address */
 	u32 spi_start;		/* The SPI number that MSIs start */
@@ -138,6 +140,11 @@ static int gicv2m_irq_gic_domain_alloc(struct irq_domain *domain,
 		fwspec.param[0] = 0;
 		fwspec.param[1] = hwirq - 32;
 		fwspec.param[2] = IRQ_TYPE_EDGE_RISING;
+	} else if (is_fwnode_irqchip(domain->parent->fwnode)) {
+		fwspec.fwnode = domain->parent->fwnode;
+		fwspec.param_count = 2;
+		fwspec.param[0] = hwirq;
+		fwspec.param[1] = IRQ_TYPE_EDGE_RISING;
 	} else {
 		return -EINVAL;
 	}
@@ -254,7 +261,9 @@ static void gicv2m_teardown(void)
 		list_del(&v2m->entry);
 		kfree(v2m->bm);
 		iounmap(v2m->base);
-		of_node_put(v2m->node);
+		of_node_put(to_of_node(v2m->fwnode));
+		if (is_fwnode_irqchip(v2m->fwnode))
+			irq_domain_free_fwnode(v2m->fwnode);
 		kfree(v2m);
 	}
 }
@@ -268,7 +277,7 @@ static int gicv2m_allocate_domains(struct irq_domain *parent)
 	if (!v2m)
 		return 0;
 
-	inner_domain = irq_domain_create_tree(of_node_to_fwnode(v2m->node),
+	inner_domain = irq_domain_create_tree(v2m->fwnode,
 					      &gicv2m_domain_ops, v2m);
 	if (!inner_domain) {
 		pr_err("Failed to create GICv2m domain\n");
@@ -277,10 +286,10 @@ static int gicv2m_allocate_domains(struct irq_domain *parent)
 
 	inner_domain->bus_token = DOMAIN_BUS_NEXUS;
 	inner_domain->parent = parent;
-	pci_domain = pci_msi_create_irq_domain(of_node_to_fwnode(v2m->node),
+	pci_domain = pci_msi_create_irq_domain(v2m->fwnode,
 					       &gicv2m_msi_domain_info,
 					       inner_domain);
-	plat_domain = platform_msi_create_irq_domain(of_node_to_fwnode(v2m->node),
+	plat_domain = platform_msi_create_irq_domain(v2m->fwnode,
 						     &gicv2m_pmsi_domain_info,
 						     inner_domain);
 	if (!pci_domain || !plat_domain) {
@@ -296,8 +305,9 @@ static int gicv2m_allocate_domains(struct irq_domain *parent)
 	return 0;
 }
 
-static int __init gicv2m_init_one(struct device_node *node,
-				  struct irq_domain *parent)
+static int __init gicv2m_init_one(struct fwnode_handle *fwnode,
+				  u32 spi_start, u32 nr_spis,
+				  struct resource *res)
 {
 	int ret;
 	struct v2m_data *v2m;
@@ -309,13 +319,9 @@ static int __init gicv2m_init_one(struct device_node *node,
 	}
 
 	INIT_LIST_HEAD(&v2m->entry);
-	v2m->node = node;
+	v2m->fwnode = fwnode;
 
-	ret = of_address_to_resource(node, 0, &v2m->res);
-	if (ret) {
-		pr_err("Failed to allocate v2m resource.\n");
-		goto err_free_v2m;
-	}
+	memcpy(&v2m->res, res, sizeof(struct resource));
 
 	v2m->base = ioremap(v2m->res.start, resource_size(&v2m->res));
 	if (!v2m->base) {
@@ -324,10 +330,9 @@ static int __init gicv2m_init_one(struct device_node *node,
 		goto err_free_v2m;
 	}
 
-	if (!of_property_read_u32(node, "arm,msi-base-spi", &v2m->spi_start) &&
-	    !of_property_read_u32(node, "arm,msi-num-spis", &v2m->nr_spis)) {
-		pr_info("Overriding V2M MSI_TYPER (base:%u, num:%u)\n",
-			v2m->spi_start, v2m->nr_spis);
+	if (spi_start && nr_spis) {
+		v2m->spi_start = spi_start;
+		v2m->nr_spis = nr_spis;
 	} else {
 		u32 typer = readl_relaxed(v2m->base + V2M_MSI_TYPER);
 
@@ -359,10 +364,9 @@ static int __init gicv2m_init_one(struct device_node *node,
 	}
 
 	list_add_tail(&v2m->entry, &v2m_nodes);
-	pr_info("Node %s: range[%#lx:%#lx], SPI[%d:%d]\n", node->name,
-		(unsigned long)v2m->res.start, (unsigned long)v2m->res.end,
-		v2m->spi_start, (v2m->spi_start + v2m->nr_spis));
 
+	pr_info("range%pR, SPI[%d:%d]\n", res,
+		v2m->spi_start, (v2m->spi_start + v2m->nr_spis - 1));
 	return 0;
 
 err_iounmap:
@@ -377,19 +381,36 @@ static struct of_device_id gicv2m_device_id[] = {
 	{},
 };
 
-int __init gicv2m_of_init(struct device_node *node, struct irq_domain *parent)
+static int __init gicv2m_of_init(struct fwnode_handle *parent_handle,
+				 struct irq_domain *parent)
 {
 	int ret = 0;
+	struct device_node *node = to_of_node(parent_handle);
 	struct device_node *child;
 
 	for (child = of_find_matching_node(node, gicv2m_device_id); child;
 	     child = of_find_matching_node(child, gicv2m_device_id)) {
+		u32 spi_start = 0, nr_spis = 0;
+		struct resource res;
+
 		if (!of_find_property(child, "msi-controller", NULL))
 			continue;
 
-		ret = gicv2m_init_one(child, parent);
+		ret = of_address_to_resource(child, 0, &res);
+		if (ret) {
+			pr_err("Failed to allocate v2m resource.\n");
+			break;
+		}
+
+		if (!of_property_read_u32(child, "arm,msi-base-spi",
+					  &spi_start) &&
+		    !of_property_read_u32(child, "arm,msi-num-spis", &nr_spis))
+			pr_info("DT overriding V2M MSI_TYPER (base:%u, num:%u)\n",
+				spi_start, nr_spis);
+
+		ret = gicv2m_init_one(&child->fwnode, spi_start, nr_spis, &res);
 		if (ret) {
-			of_node_put(node);
+			of_node_put(child);
 			break;
 		}
 	}
@@ -400,3 +421,101 @@ int __init gicv2m_of_init(struct device_node *node, struct irq_domain *parent)
 		gicv2m_teardown();
 	return ret;
 }
+
+#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 - 1;
+	res.flags = IORESOURCE_MEM;
+
+	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);
+}