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Commit 85f08c17 authored by Jiang Liu's avatar Jiang Liu Committed by Thomas Gleixner
Browse files

genirq: Introduce helper functions to support stacked irq_chip 



Now we already support hierarchy irq_data, so introduce several helpers
to support stacked irq_chips.

Signed-off-by: default avatarJiang Liu <jiang.liu@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Yingjoe Chen <yingjoe.chen@mediatek.com>
Cc: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 0cc01aba

include/linux/irq.h

+5 −0
Original line number Diff line number Diff line
@@ -443,6 +443,11 @@ extern void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc); 
extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);

extern void handle_nested_irq(unsigned int irq);



#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY

extern void irq_chip_ack_parent(struct irq_data *data);

extern int irq_chip_retrigger_hierarchy(struct irq_data *data);

#endif



/* Handling of unhandled and spurious interrupts: */

extern void note_interrupt(unsigned int irq, struct irq_desc *desc,

			   irqreturn_t action_ret);

kernel/irq/chip.c

+28 −0
Original line number Diff line number Diff line
@@ -850,3 +850,31 @@ void irq_cpu_offline(void) 
		raw_spin_unlock_irqrestore(&desc->lock, flags);

	}

}



#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY

/**

 * irq_chip_ack_parent - Acknowledge the parent interrupt

 * @data:	Pointer to interrupt specific data

 */

void irq_chip_ack_parent(struct irq_data *data)

{

	data = data->parent_data;

	data->chip->irq_ack(data);

}



/**

 * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware

 * @data:	Pointer to interrupt specific data

 *

 * Iterate through the domain hierarchy of the interrupt and check

 * whether a hw retrigger function exists. If yes, invoke it.

 */

int irq_chip_retrigger_hierarchy(struct irq_data *data)

{

	for (data = data->parent_data; data; data = data->parent_data)

		if (data->chip && data->chip->irq_retrigger)

			return data->chip->irq_retrigger(data);



	return -ENOSYS;

}

#endif