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    Subject[PATCH v2 08/17] irqdomain: Add a fwnode_handle allocator
    Date
    In order to be able to reference an irqdomain from ACPI, we need
    to be able to create an identifier, which is usually a struct
    device_node.

    This device node does't really fit the ACPI infrastructure, so
    we cunningly allocate a new structure containing a fwnode_handle,
    and return that.

    This structure doesn't really point to a device (interrupt
    controllers are not "real" devices in Linux), but as we cannot
    really deny that they exist, we create them with a new fwnode_type
    (FWNODE_IRQCHIP).

    Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
    ---
    include/linux/fwnode.h | 1 +
    include/linux/irqdomain.h | 2 ++
    kernel/irq/irqdomain.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 54 insertions(+)

    diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
    index 0408545..37ec668 100644
    --- a/include/linux/fwnode.h
    +++ b/include/linux/fwnode.h
    @@ -17,6 +17,7 @@ enum fwnode_type {
    FWNODE_OF,
    FWNODE_ACPI,
    FWNODE_PDATA,
    + FWNODE_IRQCHIP,
    };

    struct fwnode_handle {
    diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
    index 995d4c5..949caa7 100644
    --- a/include/linux/irqdomain.h
    +++ b/include/linux/irqdomain.h
    @@ -188,6 +188,8 @@ static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d)
    }

    #ifdef CONFIG_IRQ_DOMAIN
    +struct fwnode_handle *irq_domain_alloc_fwnode(void *data);
    +void irq_domain_free_fwnode(struct fwnode_handle *fwnode);
    struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
    irq_hw_number_t hwirq_max, int direct_max,
    const struct irq_domain_ops *ops,
    diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
    index de6d749..41151d3 100644
    --- a/kernel/irq/irqdomain.c
    +++ b/kernel/irq/irqdomain.c
    @@ -27,6 +27,57 @@ static int irq_domain_alloc_descs(int virq, unsigned int nr_irqs,
    irq_hw_number_t hwirq, int node);
    static void irq_domain_check_hierarchy(struct irq_domain *domain);

    +struct irqchip_fwid {
    + struct fwnode_handle fwnode;
    + char *name;
    + void *data;
    +};
    +
    +/**
    + * irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for
    + * identifying an irq domain
    + * @data: optional user-provided data
    + *
    + * Allocate a struct device_node, and return a poiner to the embedded
    + * fwnode_handle (or NULL on failure).
    + */
    +struct fwnode_handle *irq_domain_alloc_fwnode(void *data)
    +{
    + struct irqchip_fwid *fwid;
    + char *name;
    +
    + fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
    + name = kasprintf(GFP_KERNEL, "irqchip@%p", data);
    +
    + if (!fwid || !name) {
    + kfree(fwid);
    + kfree(name);
    + return NULL;
    + }
    +
    + fwid->name = name;
    + fwid->data = data;
    + fwid->fwnode.type = FWNODE_IRQCHIP;
    + return &fwid->fwnode;
    +}
    +
    +/**
    + * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
    + *
    + * Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
    + */
    +void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
    +{
    + struct irqchip_fwid *fwid;
    +
    + if (WARN_ON(fwnode->type != FWNODE_IRQCHIP))
    + return;
    +
    + fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
    + kfree(fwid->name);
    + kfree(fwid);
    +}
    +
    /**
    * __irq_domain_add() - Allocate a new irq_domain data structure
    * @of_node: optional device-tree node of the interrupt controller
    --
    2.1.4


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