From: "irqchip-bot for Marc Zyngier" <tip-bot2@linutronix.de>
To: linux-kernel@vger.kernel.org
Cc: Marc Zyngier <maz@kernel.org>, tglx@linutronix.de
Subject: [irqchip: irq/irqchip-next] irqdomain: Introduce irq_resolve_mapping()
Date: Sun, 06 Jun 2021 12:43:47 -0000 [thread overview]
Message-ID: <162298342725.29796.5624405969623096364.tip-bot2@tip-bot2> (raw)
The following commit has been merged into the irq/irqchip-next branch of irqchip:
Commit-ID: c24b101789faab2e325b6d48171524f5337a72cf
Gitweb: https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/c24b101789faab2e325b6d48171524f5337a72cf
Author: Marc Zyngier <maz@kernel.org>
AuthorDate: Tue, 04 May 2021 14:00:13 +01:00
Committer: Marc Zyngier <maz@kernel.org>
CommitterDate: Wed, 02 Jun 2021 17:35:36 +01:00
irqdomain: Introduce irq_resolve_mapping()
Rework irq_find_mapping() to return an both an irq_desc pointer,
optionally the virtual irq number, and rename the result to
__irq_resolve_mapping(). a new helper called irq_resolve_mapping()
is provided for code that doesn't need the virtual irq number.
irq_find_mapping() is also rewritten in terms of __irq_resolve_mapping().
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
include/linux/irqdomain.h | 25 ++++++++++++++++++++++---
kernel/irq/irqdomain.c | 28 ++++++++++++++++++++--------
2 files changed, 42 insertions(+), 11 deletions(-)
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 2b696c9..5b7de06 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -31,7 +31,8 @@
#define _LINUX_IRQDOMAIN_H
#include <linux/types.h>
-#include <linux/irqhandler.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
#include <linux/of.h>
#include <linux/mutex.h>
#include <linux/radix-tree.h>
@@ -401,13 +402,31 @@ static inline unsigned int irq_create_mapping(struct irq_domain *host,
return irq_create_mapping_affinity(host, hwirq, NULL);
}
+extern struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
+ irq_hw_number_t hwirq,
+ unsigned int *irq);
+
+static inline struct irq_desc *irq_resolve_mapping(struct irq_domain *domain,
+ irq_hw_number_t hwirq)
+{
+ return __irq_resolve_mapping(domain, hwirq, NULL);
+}
+
/**
* irq_find_mapping() - Find a linux irq from a hw irq number.
* @domain: domain owning this hardware interrupt
* @hwirq: hardware irq number in that domain space
*/
-extern unsigned int irq_find_mapping(struct irq_domain *host,
- irq_hw_number_t hwirq);
+static inline unsigned int irq_find_mapping(struct irq_domain *domain,
+ irq_hw_number_t hwirq)
+{
+ unsigned int irq;
+
+ if (__irq_resolve_mapping(domain, hwirq, &irq))
+ return irq;
+
+ return 0;
+}
static inline unsigned int irq_linear_revmap(struct irq_domain *domain,
irq_hw_number_t hwirq)
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 8e55bb8..012d6bf 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -876,29 +876,34 @@ void irq_dispose_mapping(unsigned int virq)
EXPORT_SYMBOL_GPL(irq_dispose_mapping);
/**
- * irq_find_mapping() - Find a linux irq from a hw irq number.
+ * irq_resolve_mapping() - Find a linux irq from a hw irq number.
* @domain: domain owning this hardware interrupt
* @hwirq: hardware irq number in that domain space
+ * @irq: optional pointer to return the Linux irq if required
+ *
+ * Returns the interrupt descriptor.
*/
-unsigned int irq_find_mapping(struct irq_domain *domain,
- irq_hw_number_t hwirq)
+struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
+ irq_hw_number_t hwirq,
+ unsigned int *irq)
{
+ struct irq_desc *desc = NULL;
struct irq_data *data;
/* Look for default domain if necessary */
if (domain == NULL)
domain = irq_default_domain;
if (domain == NULL)
- return 0;
+ return desc;
if (irq_domain_is_nomap(domain)) {
if (hwirq < domain->revmap_size) {
data = irq_domain_get_irq_data(domain, hwirq);
if (data && data->hwirq == hwirq)
- return hwirq;
+ desc = irq_data_to_desc(data);
}
- return 0;
+ return desc;
}
rcu_read_lock();
@@ -907,10 +912,17 @@ unsigned int irq_find_mapping(struct irq_domain *domain,
data = rcu_dereference(domain->revmap[hwirq]);
else
data = radix_tree_lookup(&domain->revmap_tree, hwirq);
+
+ if (likely(data)) {
+ desc = irq_data_to_desc(data);
+ if (irq)
+ *irq = data->irq;
+ }
+
rcu_read_unlock();
- return data ? data->irq : 0;
+ return desc;
}
-EXPORT_SYMBOL_GPL(irq_find_mapping);
+EXPORT_SYMBOL_GPL(__irq_resolve_mapping);
/**
* irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
next reply other threads:[~2021-06-06 12:44 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-06 12:43 irqchip-bot for Marc Zyngier [this message]
2021-06-11 13:54 [irqchip: irq/irqchip-next] irqdomain: Introduce irq_resolve_mapping() irqchip-bot for Marc Zyngier
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