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    Subject[RFC PATCH 20/33] irqchip/gic-v3-its: Add VPE domain infrastructure
    Date
    Add the basic GICv4 VPE (vcpu in GICv4 parlance) infrastructure
    (irqchip, irq domain) that is going to be populated in the following
    patches.

    Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
    ---
    drivers/irqchip/irq-gic-v3-its.c | 36 ++++++++++++++++++++++++++++++++++++
    1 file changed, 36 insertions(+)

    diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
    index 6931018..ddd8096 100644
    --- a/drivers/irqchip/irq-gic-v3-its.c
    +++ b/drivers/irqchip/irq-gic-v3-its.c
    @@ -1918,6 +1918,13 @@ 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 */
    @@ -2017,6 +2024,27 @@ static int its_init_domain(struct fwnode_handle *handle, struct its_node *its)
    return 0;
    }

    +static struct irq_domain *its_init_vpe_domain(void)
    +{
    + struct fwnode_handle *handle;
    + struct irq_domain *domain;
    +
    + handle = irq_domain_alloc_fwnode("VPE domain");
    + if (!handle)
    + return NULL;
    +
    + domain = irq_domain_create_tree(handle, &its_vpe_domain_ops, NULL);
    + if (!domain) {
    + kfree(handle);
    + return NULL;
    + }
    +
    + domain->parent = its_parent;
    + domain->bus_token = DOMAIN_BUS_NEXUS;
    +
    + return domain;
    +}
    +
    static int __init its_probe_one(struct resource *res,
    struct fwnode_handle *handle, int numa_node)
    {
    @@ -2266,6 +2294,8 @@ 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;

    its_parent = parent_domain;
    of_node = to_of_node(handle);
    @@ -2283,5 +2313,11 @@ int __init its_init(struct fwnode_handle *handle, struct rdists *rdists,
    its_alloc_lpi_tables();
    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)
    + its_init_vpe_domain();
    +
    return 0;
    }
    --
    2.1.4
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