linux-kernel - [PATCH 09/26] kernel irqdomain: export irq_domain

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Message-ID: <5e52d3c54b1fd6838feb54cfea65bd9cc8e544d3.1375867291.git.rubini@gnudd.com>
Date:	Wed, 7 Aug 2013 12:17:58 +0200
From:	Davide Ciminaghi <ciminaghi@...dd.com>
To:	linux-kernel@...r.kernel.org
Cc:	rubini@...dd.com, Giancarlo Asnaghi <giancarlo.asnaghi@...com>,
	x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
	Ingo Molnar <mingo@...hat.com>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	devicetree@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [PATCH 09/26] kernel irqdomain: export irq_domain_disassociate()

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@...dd.com>
Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@...com>
---
 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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