irq_create_of_mapping() requires an irqdomain to be registered for each
interrupt controller node.
While extending devicetree usage on x86 to devices with MSI irqs, [at
least] an msi interrupt controller node had to be added together with the
relevant irqdomain.
Registering a nomap irqdomain for each msi controller and adding irqs to
such domain in native_setup_msi_irqs() via irq_domain_associate() looked
like the simplest and safest solution to the problem, but then of course
irq_domain_disassociate() must be called by native_teardown_msi_irq().
Signed-off-by: Davide Ciminaghi <ciminaghi@xxxxxxxxx>
Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@xxxxxx>
---
include/linux/irqdomain.h | 3 +++
kernel/irq/irqdomain.c | 3 ++-
2 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index c983ed1..b7f0df4 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -172,6 +172,9 @@ extern int irq_domain_associate(struct irq_domain *domain, unsigned int irq,
extern void irq_domain_associate_many(struct irq_domain *domain,
unsigned int irq_base,
irq_hw_number_t hwirq_base, int count);
+extern void irq_domain_disassociate(struct irq_domain *domain,
+ unsigned int irq);
+
extern unsigned int irq_create_mapping(struct irq_domain *host,
irq_hw_number_t hwirq);
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 706724e..a33e29c 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -230,7 +230,7 @@ void irq_set_default_host(struct irq_domain *domain)
}
EXPORT_SYMBOL_GPL(irq_set_default_host);
-static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
+void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
{
struct irq_data *irq_data = irq_get_irq_data(irq);
irq_hw_number_t hwirq;
@@ -265,6 +265,7 @@ static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
mutex_unlock(&revmap_trees_mutex);
}
}
+EXPORT_SYMBOL(irq_domain_disassociate);
int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hwirq)
--
1.7.7.2
--
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