[PATCH v2 3/7] genirq: irqdomain: Add irq_create_acpi_mapping

Marc Zyngier
2015-07-23T13:05:46Z

In order to help ACPI on arm64 to make use of most of the irqdomain
goodies, add a new entry point (irq_create_acpi_mapping) which
mimics irq_create_of_mapping, except that it takes a new
struct acpi_gsi_descriptor, which is the pendent of of_phandle_args
in the OF world.

We assume that the way the acpi_gsi_descriptor is populated matches
that of of_phandle_args, as the latter is still the building block
for interrupt descriptor in the whole kernel.

Eventually, these two representations should be merged in a single
structure, but that's probably for another day.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
include/linux/acpi.h | 9 +++++++++
kernel/irq/irqdomain.c | 18 ++++++++++++++++++
2 files changed, 27 insertions(+)

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index d2445fa..2f23ab0 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -205,6 +205,15 @@ int acpi_register_gsi (struct device *dev, u32 gsi, int triggering, int polarity
int acpi_gsi_to_irq (u32 gsi, unsigned int *irq);
int acpi_isa_irq_to_gsi (unsigned isa_irq, u32 *gsi);

+#define MAX_GSI_DESC_PARAMS 16
+struct acpi_gsi_descriptor {
+ int param_count;
+ u32 param[MAX_GSI_DESC_PARAMS];
+};
+
+unsigned int irq_create_acpi_mapping(struct irq_domain *d,
+ struct acpi_gsi_descriptor *irq_data);
+
#ifdef CONFIG_X86_IO_APIC
extern int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity);
#else
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 27f4ec7..542cda3 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1,5 +1,6 @@
#define pr_fmt(fmt) "irq: " fmt

+#include <linux/acpi.h>
#include <linux/debugfs.h>
#include <linux/hardirq.h>
#include <linux/interrupt.h>
@@ -557,6 +558,23 @@ unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
}
EXPORT_SYMBOL_GPL(irq_create_of_mapping);

+#ifdef CONFIG_ACPI
+unsigned int irq_create_acpi_mapping(struct irq_domain *d,
+ struct acpi_gsi_descriptor *irq_data)
+{
+ struct of_phandle_args args;
+ int i;
+
+ for (i = 0; i < min(irq_data->param_count, MAX_PHANDLE_ARGS); i++)
+ args.args[i] = irq_data->param[i];
+
+ args.np = d ? d->domain_token : NULL;
+ args.args_count = i;
+
+ return irq_create_of_mapping(&args);
+}
+#endif
+
/**
* irq_dispose_mapping() - Unmap an interrupt
* @virq: linux irq number of the interrupt to unmap
--
2.1.4