irqchip/gic-v3-its: Add VPE domain infrastructure

Add the basic GICv4 VPE (vcpu in GICv4 parlance) infrastructure
(irqchip, irq domain) that is going to be populated in the following
patches.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 0aa4d609a8e91565136900859029728536fa07e7..0de4a54485e83dc15880a55cd0621913d81dceca 100644 (file)
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -2032,6 +2032,13 @@ static const struct irq_domain_ops its_domain_ops = {
        .deactivate             = its_irq_domain_deactivate,
 };
 
+static struct irq_chip its_vpe_irq_chip = {
+       .name                   = "GICv4-vpe",
+};
+
+static const struct irq_domain_ops its_vpe_domain_ops = {
+};
+
 static int its_force_quiescent(void __iomem *base)
 {
        u32 count = 1000000;    /* 1s */
@@ -2148,6 +2155,11 @@ static int its_init_domain(struct fwnode_handle *handle, struct its_node *its)
        return 0;
 }
 
+static int its_init_vpe_domain(void)
+{
+       return 0;
+}
+
 static int __init its_compute_its_list_map(struct resource *res,
                                           void __iomem *its_base)
 {
@@ -2490,6 +2502,9 @@ int __init its_init(struct fwnode_handle *handle, struct rdists *rdists,
                    struct irq_domain *parent_domain)
 {
        struct device_node *of_node;
+       struct its_node *its;
+       bool has_v4 = false;
+       int err;
 
        its_parent = parent_domain;
        of_node = to_of_node(handle);
@@ -2504,5 +2519,19 @@ int __init its_init(struct fwnode_handle *handle, struct rdists *rdists,
        }
 
        gic_rdists = rdists;
-       return its_alloc_lpi_tables();
+       err = its_alloc_lpi_tables();
+       if (err)
+               return err;
+
+       list_for_each_entry(its, &its_nodes, entry)
+               has_v4 |= its->is_v4;
+
+       if (has_v4 & rdists->has_vlpis) {
+               if (its_init_vpe_domain()) {
+                       rdists->has_vlpis = false;
+                       pr_err("ITS: Disabling GICv4 support\n");
+               }
+       }
+
+       return 0;
 }