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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: Jiang 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: Thomas Gleixner <tglx@linutronix.de>
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@ -443,6 +443,11 @@ extern void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc);
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extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
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extern void handle_nested_irq(unsigned int irq);
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#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
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extern void irq_chip_ack_parent(struct irq_data *data);
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extern int irq_chip_retrigger_hierarchy(struct irq_data *data);
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#endif
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/* Handling of unhandled and spurious interrupts: */
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extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
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irqreturn_t action_ret);
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@ -850,3 +850,31 @@ void irq_cpu_offline(void)
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raw_spin_unlock_irqrestore(&desc->lock, flags);
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}
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}
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#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
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/**
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* irq_chip_ack_parent - Acknowledge the parent interrupt
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* @data: Pointer to interrupt specific data
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*/
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void irq_chip_ack_parent(struct irq_data *data)
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{
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data = data->parent_data;
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data->chip->irq_ack(data);
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}
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/**
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* irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware
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* @data: Pointer to interrupt specific data
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*
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* Iterate through the domain hierarchy of the interrupt and check
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* whether a hw retrigger function exists. If yes, invoke it.
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*/
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int irq_chip_retrigger_hierarchy(struct irq_data *data)
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{
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for (data = data->parent_data; data; data = data->parent_data)
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if (data->chip && data->chip->irq_retrigger)
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return data->chip->irq_retrigger(data);
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return -ENOSYS;
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}
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#endif
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