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Commit b145dcc4 authored by Marc Zyngier's avatar Marc Zyngier Committed by Thomas Gleixner
Browse files

irqdomain: Add a fwnode_handle allocator 



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).

Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-and-tested-by: default avatarHanjun Guo <hanjun.guo@linaro.org>
Tested-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: Tomasz Nowicki <tomasz.nowicki@linaro.org>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Cc: Graeme Gregory <graeme@xora.org.uk>
Cc: Jake Oshins <jakeo@microsoft.com>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Link: http://lkml.kernel.org/r/1444737105-31573-9-git-send-email-marc.zyngier@arm.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 1bf4ddc4

include/linux/fwnode.h

+1 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ enum fwnode_type { 
	FWNODE_OF,

	FWNODE_ACPI,

	FWNODE_PDATA,

	FWNODE_IRQCHIP,

};



struct fwnode_handle {

include/linux/irqdomain.h

+2 −0
Original line number Diff line number Diff line
@@ -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,

kernel/irq/irqdomain.c

+51 −0
Original line number Diff line number Diff line
@@ -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