[PATCH v3 19/59] irqchip/gic-v3-its: Add VPE domain infrastructure

Marc Zyngier
2017-07-31T17:26:16Z

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>
---
drivers/irqchip/irq-gic-v3-its.c | 33 ++++++++++++++++++++++++++++++++-
1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index b618c259be8b..1fa345d53088 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -2026,6 +2026,13 @@ 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 */
@@ -2142,6 +2149,11 @@ 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)
{
@@ -2484,6 +2496,9 @@ 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);
@@ -2498,5 +2513,21 @@ 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;
+
+ its_lpi_init(rdists->id_bits);
+
+ 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;
}
--
2.11.0