[patch 03/16] genirq: Introduce helper functions to support stacked irq_chip

From: Thomas Gleixner
Date: Wed Nov 12 2014 - 08:43:01 EST


From: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>

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

Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: Yingjoe Chen <yingjoe.chen@xxxxxxxxxxxx>
Cc: Yijing Wang <wangyijing@xxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
include/linux/irq.h | 5 +++++
kernel/irq/chip.c | 17 +++++++++++++++++
2 files changed, 22 insertions(+)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 13ba412ce3a0..0adcbbbf2e87 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -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);
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 72a93086216b..12f3e72449eb 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -850,3 +850,20 @@ void irq_cpu_offline(void)
raw_spin_unlock_irqrestore(&desc->lock, flags);
}
}
+
+#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
+void irq_chip_ack_parent(struct irq_data *data)
+{
+ data = data->parent_data;
+ data->chip->irq_ack(data);
+}
+
+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
--
1.7.10.4





--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/