Message Signaled Interrupts are a PCI-specific mechanism that allows
PCI devices to notify interrupts to the CPU using in-band
messages. The PCI subsystem represents an MSI-capable interrupt
controller as an msi_chip structure, and this patch improves the
irqdomain subsystem with a new pointer associating an irq_domain with
the corresponding msi_chip.
The irq_domain structure gains a pointer to a msi_chip structure, and
a new helper function irq_domain_add_msi() is added to help in
allocating, initializing and registering an irq_domain for a MSI-type
interrupt controller.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
---
include/linux/irqdomain.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 7113941..b0504ff 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -38,6 +38,7 @@
struct device_node;
struct irq_domain;
struct of_device_id;
+struct msi_chip;
/* Number of irqs reserved for a legacy isa controller */
#define NUM_ISA_INTERRUPTS 16
@@ -101,6 +102,7 @@ struct irq_domain {
/* Optional data */
struct device_node *of_node;
struct irq_domain_chip_generic *gc;
+ struct msi_chip *msi_chip;
/* reverse map data. The linear map gets appended to the irq_domain */
irq_hw_number_t hwirq_max;
@@ -177,6 +179,22 @@ static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node
__irq_domain_register(d);
return d;
}
+static inline struct irq_domain *irq_domain_add_msi(struct device_node *of_node,
+ unsigned int size,
+ const struct irq_domain_ops *ops,
+ struct msi_chip *msi_chip,
+ void *host_data)
+{
+ struct irq_domain *d;
+ d = __irq_domain_alloc(of_node, size, size, 0, ops, host_data);
+ if (d) {
+ d->msi_chip = msi_chip;
+ __irq_domain_register(d);
+ }
+
+ return d;
+}
+
extern void irq_domain_remove(struct irq_domain *host);
--
1.8.1.2
--
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